Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | drbd.c |
| 3 | |
| 4 | This file is part of DRBD by Philipp Reisner and Lars Ellenberg. |
| 5 | |
| 6 | Copyright (C) 2001-2008, LINBIT Information Technologies GmbH. |
| 7 | Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>. |
| 8 | Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>. |
| 9 | |
| 10 | Thanks to Carter Burden, Bart Grantham and Gennadiy Nerubayev |
| 11 | from Logicworks, Inc. for making SDP replication support possible. |
| 12 | |
| 13 | drbd is free software; you can redistribute it and/or modify |
| 14 | it under the terms of the GNU General Public License as published by |
| 15 | the Free Software Foundation; either version 2, or (at your option) |
| 16 | any later version. |
| 17 | |
| 18 | drbd is distributed in the hope that it will be useful, |
| 19 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | GNU General Public License for more details. |
| 22 | |
| 23 | You should have received a copy of the GNU General Public License |
| 24 | along with drbd; see the file COPYING. If not, write to |
| 25 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | |
| 27 | */ |
| 28 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 29 | #include <linux/module.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 30 | #include <linux/drbd.h> |
| 31 | #include <asm/uaccess.h> |
| 32 | #include <asm/types.h> |
| 33 | #include <net/sock.h> |
| 34 | #include <linux/ctype.h> |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 35 | #include <linux/mutex.h> |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 36 | #include <linux/fs.h> |
| 37 | #include <linux/file.h> |
| 38 | #include <linux/proc_fs.h> |
| 39 | #include <linux/init.h> |
| 40 | #include <linux/mm.h> |
| 41 | #include <linux/memcontrol.h> |
| 42 | #include <linux/mm_inline.h> |
| 43 | #include <linux/slab.h> |
| 44 | #include <linux/random.h> |
| 45 | #include <linux/reboot.h> |
| 46 | #include <linux/notifier.h> |
| 47 | #include <linux/kthread.h> |
| 48 | |
| 49 | #define __KERNEL_SYSCALLS__ |
| 50 | #include <linux/unistd.h> |
| 51 | #include <linux/vmalloc.h> |
| 52 | |
| 53 | #include <linux/drbd_limits.h> |
| 54 | #include "drbd_int.h" |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 55 | #include "drbd_req.h" /* only for _req_mod in tl_release and tl_clear */ |
| 56 | |
| 57 | #include "drbd_vli.h" |
| 58 | |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 59 | static DEFINE_MUTEX(drbd_main_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 60 | int drbdd_init(struct drbd_thread *); |
| 61 | int drbd_worker(struct drbd_thread *); |
| 62 | int drbd_asender(struct drbd_thread *); |
| 63 | |
| 64 | int drbd_init(void); |
| 65 | static int drbd_open(struct block_device *bdev, fmode_t mode); |
| 66 | static int drbd_release(struct gendisk *gd, fmode_t mode); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 67 | static int w_md_sync(struct drbd_work *w, int unused); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 68 | static void md_sync_timer_fn(unsigned long data); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 69 | static int w_bitmap_io(struct drbd_work *w, int unused); |
| 70 | static int w_go_diskless(struct drbd_work *w, int unused); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 71 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 72 | MODULE_AUTHOR("Philipp Reisner <phil@linbit.com>, " |
| 73 | "Lars Ellenberg <lars@linbit.com>"); |
| 74 | MODULE_DESCRIPTION("drbd - Distributed Replicated Block Device v" REL_VERSION); |
| 75 | MODULE_VERSION(REL_VERSION); |
| 76 | MODULE_LICENSE("GPL"); |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 77 | MODULE_PARM_DESC(minor_count, "Approximate number of drbd devices (" |
Philipp Reisner | 2b8a90b | 2011-01-10 11:15:17 +0100 | [diff] [blame] | 78 | __stringify(DRBD_MINOR_COUNT_MIN) "-" __stringify(DRBD_MINOR_COUNT_MAX) ")"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 79 | MODULE_ALIAS_BLOCKDEV_MAJOR(DRBD_MAJOR); |
| 80 | |
| 81 | #include <linux/moduleparam.h> |
| 82 | /* allow_open_on_secondary */ |
| 83 | MODULE_PARM_DESC(allow_oos, "DONT USE!"); |
| 84 | /* thanks to these macros, if compiled into the kernel (not-module), |
| 85 | * this becomes the boot parameter drbd.minor_count */ |
| 86 | module_param(minor_count, uint, 0444); |
| 87 | module_param(disable_sendpage, bool, 0644); |
| 88 | module_param(allow_oos, bool, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 89 | module_param(proc_details, int, 0644); |
| 90 | |
| 91 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
| 92 | int enable_faults; |
| 93 | int fault_rate; |
| 94 | static int fault_count; |
| 95 | int fault_devs; |
| 96 | /* bitmap of enabled faults */ |
| 97 | module_param(enable_faults, int, 0664); |
| 98 | /* fault rate % value - applies to all enabled faults */ |
| 99 | module_param(fault_rate, int, 0664); |
| 100 | /* count of faults inserted */ |
| 101 | module_param(fault_count, int, 0664); |
| 102 | /* bitmap of devices to insert faults on */ |
| 103 | module_param(fault_devs, int, 0644); |
| 104 | #endif |
| 105 | |
| 106 | /* module parameter, defined */ |
Philipp Reisner | 2b8a90b | 2011-01-10 11:15:17 +0100 | [diff] [blame] | 107 | unsigned int minor_count = DRBD_MINOR_COUNT_DEF; |
Rusty Russell | 90ab5ee | 2012-01-13 09:32:20 +1030 | [diff] [blame] | 108 | bool disable_sendpage; |
| 109 | bool allow_oos; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 110 | int proc_details; /* Detail level in proc drbd*/ |
| 111 | |
| 112 | /* Module parameter for setting the user mode helper program |
| 113 | * to run. Default is /sbin/drbdadm */ |
| 114 | char usermode_helper[80] = "/sbin/drbdadm"; |
| 115 | |
| 116 | module_param_string(usermode_helper, usermode_helper, sizeof(usermode_helper), 0644); |
| 117 | |
| 118 | /* in 2.6.x, our device mapping and config info contains our virtual gendisks |
| 119 | * as member "struct gendisk *vdisk;" |
| 120 | */ |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 121 | struct idr minors; |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 122 | struct list_head drbd_tconns; /* list of struct drbd_tconn */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 123 | |
| 124 | struct kmem_cache *drbd_request_cache; |
Andreas Gruenbacher | 6c852be | 2011-02-04 15:38:52 +0100 | [diff] [blame] | 125 | struct kmem_cache *drbd_ee_cache; /* peer requests */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 126 | struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ |
| 127 | struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ |
| 128 | mempool_t *drbd_request_mempool; |
| 129 | mempool_t *drbd_ee_mempool; |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 130 | mempool_t *drbd_md_io_page_pool; |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 131 | struct bio_set *drbd_md_io_bio_set; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 132 | |
| 133 | /* I do not use a standard mempool, because: |
| 134 | 1) I want to hand out the pre-allocated objects first. |
| 135 | 2) I want to be able to interrupt sleeping allocation with a signal. |
| 136 | Note: This is a single linked list, the next pointer is the private |
| 137 | member of struct page. |
| 138 | */ |
| 139 | struct page *drbd_pp_pool; |
| 140 | spinlock_t drbd_pp_lock; |
| 141 | int drbd_pp_vacant; |
| 142 | wait_queue_head_t drbd_pp_wait; |
| 143 | |
| 144 | DEFINE_RATELIMIT_STATE(drbd_ratelimit_state, 5 * HZ, 5); |
| 145 | |
Emese Revfy | 7d4e9d0 | 2009-12-14 00:59:30 +0100 | [diff] [blame] | 146 | static const struct block_device_operations drbd_ops = { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 147 | .owner = THIS_MODULE, |
| 148 | .open = drbd_open, |
| 149 | .release = drbd_release, |
| 150 | }; |
| 151 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 152 | struct bio *bio_alloc_drbd(gfp_t gfp_mask) |
| 153 | { |
Lars Ellenberg | da4a75d | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 154 | struct bio *bio; |
| 155 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 156 | if (!drbd_md_io_bio_set) |
| 157 | return bio_alloc(gfp_mask, 1); |
| 158 | |
Lars Ellenberg | da4a75d | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 159 | bio = bio_alloc_bioset(gfp_mask, 1, drbd_md_io_bio_set); |
| 160 | if (!bio) |
| 161 | return NULL; |
Lars Ellenberg | da4a75d | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 162 | return bio; |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 163 | } |
| 164 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 165 | #ifdef __CHECKER__ |
| 166 | /* When checking with sparse, and this is an inline function, sparse will |
| 167 | give tons of false positives. When this is a real functions sparse works. |
| 168 | */ |
| 169 | int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) |
| 170 | { |
| 171 | int io_allowed; |
| 172 | |
| 173 | atomic_inc(&mdev->local_cnt); |
| 174 | io_allowed = (mdev->state.disk >= mins); |
| 175 | if (!io_allowed) { |
| 176 | if (atomic_dec_and_test(&mdev->local_cnt)) |
| 177 | wake_up(&mdev->misc_wait); |
| 178 | } |
| 179 | return io_allowed; |
| 180 | } |
| 181 | |
| 182 | #endif |
| 183 | |
| 184 | /** |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 185 | * tl_release() - mark as BARRIER_ACKED all requests in the corresponding transfer log epoch |
| 186 | * @tconn: DRBD connection. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 187 | * @barrier_nr: Expected identifier of the DRBD write barrier packet. |
| 188 | * @set_size: Expected number of requests before that barrier. |
| 189 | * |
| 190 | * In case the passed barrier_nr or set_size does not match the oldest |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 191 | * epoch of not yet barrier-acked requests, this function will cause a |
| 192 | * termination of the connection. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 193 | */ |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 194 | void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr, |
| 195 | unsigned int set_size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 196 | { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 197 | struct drbd_request *r; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 198 | struct drbd_request *req = NULL; |
| 199 | int expect_epoch = 0; |
| 200 | int expect_size = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 201 | |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 202 | spin_lock_irq(&tconn->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 203 | |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 204 | /* find oldest not yet barrier-acked write request, |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 205 | * count writes in its epoch. */ |
| 206 | list_for_each_entry(r, &tconn->transfer_log, tl_requests) { |
Lars Ellenberg | a0d856d | 2012-01-24 17:19:42 +0100 | [diff] [blame] | 207 | const unsigned s = r->rq_state; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 208 | if (!req) { |
| 209 | if (!(s & RQ_WRITE)) |
| 210 | continue; |
| 211 | if (!(s & RQ_NET_MASK)) |
| 212 | continue; |
| 213 | if (s & RQ_NET_DONE) |
| 214 | continue; |
| 215 | req = r; |
| 216 | expect_epoch = req->epoch; |
| 217 | expect_size ++; |
| 218 | } else { |
| 219 | if (r->epoch != expect_epoch) |
| 220 | break; |
| 221 | if (!(s & RQ_WRITE)) |
| 222 | continue; |
| 223 | /* if (s & RQ_DONE): not expected */ |
| 224 | /* if (!(s & RQ_NET_MASK)): not expected */ |
| 225 | expect_size++; |
| 226 | } |
| 227 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 228 | |
| 229 | /* first some paranoia code */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 230 | if (req == NULL) { |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 231 | conn_err(tconn, "BAD! BarrierAck #%u received, but no epoch in tl!?\n", |
| 232 | barrier_nr); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 233 | goto bail; |
| 234 | } |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 235 | if (expect_epoch != barrier_nr) { |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 236 | conn_err(tconn, "BAD! BarrierAck #%u received, expected #%u!\n", |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 237 | barrier_nr, expect_epoch); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 238 | goto bail; |
| 239 | } |
| 240 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 241 | if (expect_size != set_size) { |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 242 | conn_err(tconn, "BAD! BarrierAck #%u received with n_writes=%u, expected n_writes=%u!\n", |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 243 | barrier_nr, set_size, expect_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 244 | goto bail; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 245 | } |
| 246 | |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 247 | /* Clean up list of requests processed during current epoch. */ |
| 248 | /* this extra list walk restart is paranoia, |
| 249 | * to catch requests being barrier-acked "unexpectedly". |
| 250 | * It usually should find the same req again, or some READ preceding it. */ |
| 251 | list_for_each_entry(req, &tconn->transfer_log, tl_requests) |
| 252 | if (req->epoch == expect_epoch) |
| 253 | break; |
| 254 | list_for_each_entry_safe_from(req, r, &tconn->transfer_log, tl_requests) { |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 255 | if (req->epoch != expect_epoch) |
| 256 | break; |
| 257 | _req_mod(req, BARRIER_ACKED); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 258 | } |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 259 | spin_unlock_irq(&tconn->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 260 | |
| 261 | return; |
| 262 | |
| 263 | bail: |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 264 | spin_unlock_irq(&tconn->req_lock); |
| 265 | conn_request_state(tconn, NS(conn, C_PROTOCOL_ERROR), CS_HARD); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Philipp Reisner | 617049a | 2010-12-22 12:48:31 +0100 | [diff] [blame] | 268 | |
Philipp Reisner | 11b58e7 | 2010-05-12 17:08:26 +0200 | [diff] [blame] | 269 | /** |
| 270 | * _tl_restart() - Walks the transfer log, and applies an action to all requests |
| 271 | * @mdev: DRBD device. |
| 272 | * @what: The action/event to perform with all request objects |
| 273 | * |
Andreas Gruenbacher | 8554df1 | 2011-01-25 15:37:43 +0100 | [diff] [blame] | 274 | * @what might be one of CONNECTION_LOST_WHILE_PENDING, RESEND, FAIL_FROZEN_DISK_IO, |
| 275 | * RESTART_FROZEN_DISK_IO. |
Philipp Reisner | 11b58e7 | 2010-05-12 17:08:26 +0200 | [diff] [blame] | 276 | */ |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 277 | /* must hold resource->req_lock */ |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 278 | void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) |
Philipp Reisner | 11b58e7 | 2010-05-12 17:08:26 +0200 | [diff] [blame] | 279 | { |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 280 | struct drbd_request *req, *r; |
Philipp Reisner | 11b58e7 | 2010-05-12 17:08:26 +0200 | [diff] [blame] | 281 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 282 | list_for_each_entry_safe(req, r, &tconn->transfer_log, tl_requests) |
Philipp Reisner | 509fc01 | 2012-07-31 11:22:58 +0200 | [diff] [blame] | 283 | _req_mod(req, what); |
Philipp Reisner | 11b58e7 | 2010-05-12 17:08:26 +0200 | [diff] [blame] | 284 | } |
| 285 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 286 | void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what) |
| 287 | { |
| 288 | spin_lock_irq(&tconn->req_lock); |
| 289 | _tl_restart(tconn, what); |
| 290 | spin_unlock_irq(&tconn->req_lock); |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 291 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 292 | |
| 293 | /** |
| 294 | * tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL |
| 295 | * @mdev: DRBD device. |
| 296 | * |
| 297 | * This is called after the connection to the peer was lost. The storage covered |
| 298 | * by the requests on the transfer gets marked as our of sync. Called from the |
| 299 | * receiver thread and the worker thread. |
| 300 | */ |
Philipp Reisner | 2f5cdd0 | 2011-02-21 14:29:27 +0100 | [diff] [blame] | 301 | void tl_clear(struct drbd_tconn *tconn) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 302 | { |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 303 | tl_restart(tconn, CONNECTION_LOST_WHILE_PENDING); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 304 | } |
| 305 | |
| 306 | /** |
Philipp Reisner | fd2491f | 2011-07-18 16:25:15 +0200 | [diff] [blame] | 307 | * tl_abort_disk_io() - Abort disk I/O for all requests for a certain mdev in the TL |
| 308 | * @mdev: DRBD device. |
| 309 | */ |
| 310 | void tl_abort_disk_io(struct drbd_conf *mdev) |
| 311 | { |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 312 | struct drbd_tconn *tconn = mdev->tconn; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 313 | struct drbd_request *req, *r; |
Philipp Reisner | fd2491f | 2011-07-18 16:25:15 +0200 | [diff] [blame] | 314 | |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 315 | spin_lock_irq(&tconn->req_lock); |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 316 | list_for_each_entry_safe(req, r, &tconn->transfer_log, tl_requests) { |
Philipp Reisner | fd2491f | 2011-07-18 16:25:15 +0200 | [diff] [blame] | 317 | if (!(req->rq_state & RQ_LOCAL_PENDING)) |
| 318 | continue; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 319 | if (req->w.mdev != mdev) |
| 320 | continue; |
| 321 | _req_mod(req, ABORT_DISK_IO); |
Philipp Reisner | fd2491f | 2011-07-18 16:25:15 +0200 | [diff] [blame] | 322 | } |
Philipp Reisner | cdfda63 | 2011-07-05 15:38:59 +0200 | [diff] [blame] | 323 | spin_unlock_irq(&tconn->req_lock); |
Philipp Reisner | fd2491f | 2011-07-18 16:25:15 +0200 | [diff] [blame] | 324 | } |
| 325 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 326 | static int drbd_thread_setup(void *arg) |
| 327 | { |
| 328 | struct drbd_thread *thi = (struct drbd_thread *) arg; |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 329 | struct drbd_tconn *tconn = thi->tconn; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 330 | unsigned long flags; |
| 331 | int retval; |
| 332 | |
Philipp Reisner | f1b3a6e | 2011-02-08 15:35:58 +0100 | [diff] [blame] | 333 | snprintf(current->comm, sizeof(current->comm), "drbd_%c_%s", |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 334 | thi->name[0], thi->tconn->name); |
Philipp Reisner | f1b3a6e | 2011-02-08 15:35:58 +0100 | [diff] [blame] | 335 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 336 | restart: |
| 337 | retval = thi->function(thi); |
| 338 | |
| 339 | spin_lock_irqsave(&thi->t_lock, flags); |
| 340 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 341 | /* if the receiver has been "EXITING", the last thing it did |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 342 | * was set the conn state to "StandAlone", |
| 343 | * if now a re-connect request comes in, conn state goes C_UNCONNECTED, |
| 344 | * and receiver thread will be "started". |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 345 | * drbd_thread_start needs to set "RESTARTING" in that case. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 346 | * t_state check and assignment needs to be within the same spinlock, |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 347 | * so either thread_start sees EXITING, and can remap to RESTARTING, |
| 348 | * or thread_start see NONE, and can proceed as normal. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 349 | */ |
| 350 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 351 | if (thi->t_state == RESTARTING) { |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 352 | conn_info(tconn, "Restarting %s thread\n", thi->name); |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 353 | thi->t_state = RUNNING; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 354 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 355 | goto restart; |
| 356 | } |
| 357 | |
| 358 | thi->task = NULL; |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 359 | thi->t_state = NONE; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 360 | smp_mb(); |
Lars Ellenberg | 992d6e9 | 2011-05-02 11:47:18 +0200 | [diff] [blame] | 361 | complete_all(&thi->stop); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 362 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 363 | |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 364 | conn_info(tconn, "Terminating %s\n", current->comm); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 365 | |
| 366 | /* Release mod reference taken when thread was started */ |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 367 | |
| 368 | kref_put(&tconn->kref, &conn_destroy); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 369 | module_put(THIS_MODULE); |
| 370 | return retval; |
| 371 | } |
| 372 | |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 373 | static void drbd_thread_init(struct drbd_tconn *tconn, struct drbd_thread *thi, |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 374 | int (*func) (struct drbd_thread *), char *name) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 375 | { |
| 376 | spin_lock_init(&thi->t_lock); |
| 377 | thi->task = NULL; |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 378 | thi->t_state = NONE; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 379 | thi->function = func; |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 380 | thi->tconn = tconn; |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 381 | strncpy(thi->name, name, ARRAY_SIZE(thi->name)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 382 | } |
| 383 | |
| 384 | int drbd_thread_start(struct drbd_thread *thi) |
| 385 | { |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 386 | struct drbd_tconn *tconn = thi->tconn; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 387 | struct task_struct *nt; |
| 388 | unsigned long flags; |
| 389 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 390 | /* is used from state engine doing drbd_thread_stop_nowait, |
| 391 | * while holding the req lock irqsave */ |
| 392 | spin_lock_irqsave(&thi->t_lock, flags); |
| 393 | |
| 394 | switch (thi->t_state) { |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 395 | case NONE: |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 396 | conn_info(tconn, "Starting %s thread (from %s [%d])\n", |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 397 | thi->name, current->comm, current->pid); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 398 | |
| 399 | /* Get ref on module for thread - this is released when thread exits */ |
| 400 | if (!try_module_get(THIS_MODULE)) { |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 401 | conn_err(tconn, "Failed to get module reference in drbd_thread_start\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 402 | spin_unlock_irqrestore(&thi->t_lock, flags); |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 403 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 404 | } |
| 405 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 406 | kref_get(&thi->tconn->kref); |
| 407 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 408 | init_completion(&thi->stop); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 409 | thi->reset_cpu_mask = 1; |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 410 | thi->t_state = RUNNING; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 411 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 412 | flush_signals(current); /* otherw. may get -ERESTARTNOINTR */ |
| 413 | |
| 414 | nt = kthread_create(drbd_thread_setup, (void *) thi, |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 415 | "drbd_%c_%s", thi->name[0], thi->tconn->name); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 416 | |
| 417 | if (IS_ERR(nt)) { |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 418 | conn_err(tconn, "Couldn't start thread\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 419 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 420 | kref_put(&tconn->kref, &conn_destroy); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 421 | module_put(THIS_MODULE); |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 422 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 423 | } |
| 424 | spin_lock_irqsave(&thi->t_lock, flags); |
| 425 | thi->task = nt; |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 426 | thi->t_state = RUNNING; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 427 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 428 | wake_up_process(nt); |
| 429 | break; |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 430 | case EXITING: |
| 431 | thi->t_state = RESTARTING; |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 432 | conn_info(tconn, "Restarting %s thread (from %s [%d])\n", |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 433 | thi->name, current->comm, current->pid); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 434 | /* fall through */ |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 435 | case RUNNING: |
| 436 | case RESTARTING: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 437 | default: |
| 438 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 439 | break; |
| 440 | } |
| 441 | |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 442 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | |
| 446 | void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait) |
| 447 | { |
| 448 | unsigned long flags; |
| 449 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 450 | enum drbd_thread_state ns = restart ? RESTARTING : EXITING; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 451 | |
| 452 | /* may be called from state engine, holding the req lock irqsave */ |
| 453 | spin_lock_irqsave(&thi->t_lock, flags); |
| 454 | |
Andreas Gruenbacher | e77a0a5 | 2011-01-25 15:43:39 +0100 | [diff] [blame] | 455 | if (thi->t_state == NONE) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 456 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 457 | if (restart) |
| 458 | drbd_thread_start(thi); |
| 459 | return; |
| 460 | } |
| 461 | |
| 462 | if (thi->t_state != ns) { |
| 463 | if (thi->task == NULL) { |
| 464 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 465 | return; |
| 466 | } |
| 467 | |
| 468 | thi->t_state = ns; |
| 469 | smp_mb(); |
| 470 | init_completion(&thi->stop); |
| 471 | if (thi->task != current) |
| 472 | force_sig(DRBD_SIGKILL, thi->task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | spin_unlock_irqrestore(&thi->t_lock, flags); |
| 476 | |
| 477 | if (wait) |
| 478 | wait_for_completion(&thi->stop); |
| 479 | } |
| 480 | |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 481 | static struct drbd_thread *drbd_task_to_thread(struct drbd_tconn *tconn, struct task_struct *task) |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 482 | { |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 483 | struct drbd_thread *thi = |
| 484 | task == tconn->receiver.task ? &tconn->receiver : |
| 485 | task == tconn->asender.task ? &tconn->asender : |
| 486 | task == tconn->worker.task ? &tconn->worker : NULL; |
| 487 | |
| 488 | return thi; |
| 489 | } |
| 490 | |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 491 | char *drbd_task_to_thread_name(struct drbd_tconn *tconn, struct task_struct *task) |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 492 | { |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 493 | struct drbd_thread *thi = drbd_task_to_thread(tconn, task); |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 494 | return thi ? thi->name : task->comm; |
| 495 | } |
| 496 | |
Philipp Reisner | 8088319 | 2011-02-18 14:56:45 +0100 | [diff] [blame] | 497 | int conn_lowest_minor(struct drbd_tconn *tconn) |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 498 | { |
Philipp Reisner | e90285e | 2011-03-22 12:51:21 +0100 | [diff] [blame] | 499 | struct drbd_conf *mdev; |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 500 | int vnr = 0, m; |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 501 | |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 502 | rcu_read_lock(); |
Philipp Reisner | e90285e | 2011-03-22 12:51:21 +0100 | [diff] [blame] | 503 | mdev = idr_get_next(&tconn->volumes, &vnr); |
Philipp Reisner | 695d08f | 2011-04-11 22:53:32 -0700 | [diff] [blame] | 504 | m = mdev ? mdev_to_minor(mdev) : -1; |
| 505 | rcu_read_unlock(); |
| 506 | |
| 507 | return m; |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 508 | } |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 509 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 510 | #ifdef CONFIG_SMP |
| 511 | /** |
| 512 | * drbd_calc_cpu_mask() - Generate CPU masks, spread over all CPUs |
| 513 | * @mdev: DRBD device. |
| 514 | * |
| 515 | * Forces all threads of a device onto the same CPU. This is beneficial for |
| 516 | * DRBD's performance. May be overwritten by user's configuration. |
| 517 | */ |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 518 | void drbd_calc_cpu_mask(struct drbd_tconn *tconn) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 519 | { |
| 520 | int ord, cpu; |
| 521 | |
| 522 | /* user override. */ |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 523 | if (cpumask_weight(tconn->cpu_mask)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 524 | return; |
| 525 | |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 526 | ord = conn_lowest_minor(tconn) % cpumask_weight(cpu_online_mask); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 527 | for_each_online_cpu(cpu) { |
| 528 | if (ord-- == 0) { |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 529 | cpumask_set_cpu(cpu, tconn->cpu_mask); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 530 | return; |
| 531 | } |
| 532 | } |
| 533 | /* should not be reached */ |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 534 | cpumask_setall(tconn->cpu_mask); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 535 | } |
| 536 | |
| 537 | /** |
| 538 | * drbd_thread_current_set_cpu() - modifies the cpu mask of the _current_ thread |
| 539 | * @mdev: DRBD device. |
Philipp Reisner | bc31fe3 | 2011-02-07 11:14:38 +0100 | [diff] [blame] | 540 | * @thi: drbd_thread object |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 541 | * |
| 542 | * call in the "main loop" of _all_ threads, no need for any mutex, current won't die |
| 543 | * prematurely. |
| 544 | */ |
Philipp Reisner | 8082228 | 2011-02-08 12:46:30 +0100 | [diff] [blame] | 545 | void drbd_thread_current_set_cpu(struct drbd_thread *thi) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 546 | { |
| 547 | struct task_struct *p = current; |
Philipp Reisner | bed879a | 2011-02-04 14:00:37 +0100 | [diff] [blame] | 548 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 549 | if (!thi->reset_cpu_mask) |
| 550 | return; |
| 551 | thi->reset_cpu_mask = 0; |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 552 | set_cpus_allowed_ptr(p, thi->tconn->cpu_mask); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 553 | } |
| 554 | #endif |
| 555 | |
Andreas Gruenbacher | 52b061a | 2011-03-30 11:38:49 +0200 | [diff] [blame] | 556 | /** |
| 557 | * drbd_header_size - size of a packet header |
| 558 | * |
| 559 | * The header size is a multiple of 8, so any payload following the header is |
| 560 | * word aligned on 64-bit architectures. (The bitmap send and receive code |
| 561 | * relies on this.) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 562 | */ |
Andreas Gruenbacher | 52b061a | 2011-03-30 11:38:49 +0200 | [diff] [blame] | 563 | unsigned int drbd_header_size(struct drbd_tconn *tconn) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 564 | { |
Andreas Gruenbacher | 0c8e36d | 2011-03-30 16:00:17 +0200 | [diff] [blame] | 565 | if (tconn->agreed_pro_version >= 100) { |
| 566 | BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header100), 8)); |
| 567 | return sizeof(struct p_header100); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 568 | } else { |
Andreas Gruenbacher | 0c8e36d | 2011-03-30 16:00:17 +0200 | [diff] [blame] | 569 | BUILD_BUG_ON(sizeof(struct p_header80) != |
| 570 | sizeof(struct p_header95)); |
| 571 | BUILD_BUG_ON(!IS_ALIGNED(sizeof(struct p_header80), 8)); |
| 572 | return sizeof(struct p_header80); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 573 | } |
Andreas Gruenbacher | 52b061a | 2011-03-30 11:38:49 +0200 | [diff] [blame] | 574 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 575 | |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 576 | static unsigned int prepare_header80(struct p_header80 *h, enum drbd_packet cmd, int size) |
Philipp Reisner | fd340c1 | 2011-01-19 16:57:39 +0100 | [diff] [blame] | 577 | { |
| 578 | h->magic = cpu_to_be32(DRBD_MAGIC); |
| 579 | h->command = cpu_to_be16(cmd); |
| 580 | h->length = cpu_to_be16(size); |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 581 | return sizeof(struct p_header80); |
Philipp Reisner | fd340c1 | 2011-01-19 16:57:39 +0100 | [diff] [blame] | 582 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 583 | |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 584 | static unsigned int prepare_header95(struct p_header95 *h, enum drbd_packet cmd, int size) |
Philipp Reisner | fd340c1 | 2011-01-19 16:57:39 +0100 | [diff] [blame] | 585 | { |
| 586 | h->magic = cpu_to_be16(DRBD_MAGIC_BIG); |
| 587 | h->command = cpu_to_be16(cmd); |
Andreas Gruenbacher | b55d84b | 2011-03-22 13:17:47 +0100 | [diff] [blame] | 588 | h->length = cpu_to_be32(size); |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 589 | return sizeof(struct p_header95); |
Philipp Reisner | fd340c1 | 2011-01-19 16:57:39 +0100 | [diff] [blame] | 590 | } |
| 591 | |
Andreas Gruenbacher | 0c8e36d | 2011-03-30 16:00:17 +0200 | [diff] [blame] | 592 | static unsigned int prepare_header100(struct p_header100 *h, enum drbd_packet cmd, |
| 593 | int size, int vnr) |
Philipp Reisner | d38e787 | 2011-02-07 15:32:04 +0100 | [diff] [blame] | 594 | { |
Andreas Gruenbacher | 0c8e36d | 2011-03-30 16:00:17 +0200 | [diff] [blame] | 595 | h->magic = cpu_to_be32(DRBD_MAGIC_100); |
| 596 | h->volume = cpu_to_be16(vnr); |
| 597 | h->command = cpu_to_be16(cmd); |
| 598 | h->length = cpu_to_be32(size); |
| 599 | h->pad = 0; |
| 600 | return sizeof(struct p_header100); |
| 601 | } |
| 602 | |
| 603 | static unsigned int prepare_header(struct drbd_tconn *tconn, int vnr, |
| 604 | void *buffer, enum drbd_packet cmd, int size) |
| 605 | { |
| 606 | if (tconn->agreed_pro_version >= 100) |
| 607 | return prepare_header100(buffer, cmd, size, vnr); |
| 608 | else if (tconn->agreed_pro_version >= 95 && |
| 609 | size > DRBD_MAX_SIZE_H80_PACKET) |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 610 | return prepare_header95(buffer, cmd, size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 611 | else |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 612 | return prepare_header80(buffer, cmd, size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 613 | } |
| 614 | |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 615 | static void *__conn_prepare_command(struct drbd_tconn *tconn, |
| 616 | struct drbd_socket *sock) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 617 | { |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 618 | if (!sock->socket) |
| 619 | return NULL; |
| 620 | return sock->sbuf + drbd_header_size(tconn); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 621 | } |
| 622 | |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 623 | void *conn_prepare_command(struct drbd_tconn *tconn, struct drbd_socket *sock) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 624 | { |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 625 | void *p; |
| 626 | |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 627 | mutex_lock(&sock->mutex); |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 628 | p = __conn_prepare_command(tconn, sock); |
| 629 | if (!p) |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 630 | mutex_unlock(&sock->mutex); |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 631 | |
| 632 | return p; |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 633 | } |
| 634 | |
| 635 | void *drbd_prepare_command(struct drbd_conf *mdev, struct drbd_socket *sock) |
| 636 | { |
| 637 | return conn_prepare_command(mdev->tconn, sock); |
| 638 | } |
| 639 | |
| 640 | static int __send_command(struct drbd_tconn *tconn, int vnr, |
| 641 | struct drbd_socket *sock, enum drbd_packet cmd, |
| 642 | unsigned int header_size, void *data, |
| 643 | unsigned int size) |
| 644 | { |
| 645 | int msg_flags; |
| 646 | int err; |
| 647 | |
| 648 | /* |
| 649 | * Called with @data == NULL and the size of the data blocks in @size |
| 650 | * for commands that send data blocks. For those commands, omit the |
| 651 | * MSG_MORE flag: this will increase the likelihood that data blocks |
| 652 | * which are page aligned on the sender will end up page aligned on the |
| 653 | * receiver. |
| 654 | */ |
| 655 | msg_flags = data ? MSG_MORE : 0; |
| 656 | |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 657 | header_size += prepare_header(tconn, vnr, sock->sbuf, cmd, |
| 658 | header_size + size); |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 659 | err = drbd_send_all(tconn, sock->socket, sock->sbuf, header_size, |
| 660 | msg_flags); |
| 661 | if (data && !err) |
| 662 | err = drbd_send_all(tconn, sock->socket, data, size, 0); |
| 663 | return err; |
| 664 | } |
| 665 | |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 666 | static int __conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, |
| 667 | enum drbd_packet cmd, unsigned int header_size, |
| 668 | void *data, unsigned int size) |
| 669 | { |
| 670 | return __send_command(tconn, 0, sock, cmd, header_size, data, size); |
| 671 | } |
| 672 | |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 673 | int conn_send_command(struct drbd_tconn *tconn, struct drbd_socket *sock, |
| 674 | enum drbd_packet cmd, unsigned int header_size, |
| 675 | void *data, unsigned int size) |
| 676 | { |
| 677 | int err; |
| 678 | |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 679 | err = __conn_send_command(tconn, sock, cmd, header_size, data, size); |
Andreas Gruenbacher | dba5858 | 2011-03-29 16:55:40 +0200 | [diff] [blame] | 680 | mutex_unlock(&sock->mutex); |
| 681 | return err; |
| 682 | } |
| 683 | |
| 684 | int drbd_send_command(struct drbd_conf *mdev, struct drbd_socket *sock, |
| 685 | enum drbd_packet cmd, unsigned int header_size, |
| 686 | void *data, unsigned int size) |
| 687 | { |
| 688 | int err; |
| 689 | |
| 690 | err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, header_size, |
| 691 | data, size); |
| 692 | mutex_unlock(&sock->mutex); |
| 693 | return err; |
| 694 | } |
| 695 | |
Andreas Gruenbacher | e307f35 | 2011-03-22 10:55:48 +0100 | [diff] [blame] | 696 | int drbd_send_ping(struct drbd_tconn *tconn) |
| 697 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 698 | struct drbd_socket *sock; |
| 699 | |
| 700 | sock = &tconn->meta; |
| 701 | if (!conn_prepare_command(tconn, sock)) |
| 702 | return -EIO; |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 703 | return conn_send_command(tconn, sock, P_PING, 0, NULL, 0); |
Andreas Gruenbacher | e307f35 | 2011-03-22 10:55:48 +0100 | [diff] [blame] | 704 | } |
| 705 | |
| 706 | int drbd_send_ping_ack(struct drbd_tconn *tconn) |
| 707 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 708 | struct drbd_socket *sock; |
| 709 | |
| 710 | sock = &tconn->meta; |
| 711 | if (!conn_prepare_command(tconn, sock)) |
| 712 | return -EIO; |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 713 | return conn_send_command(tconn, sock, P_PING_ACK, 0, NULL, 0); |
Andreas Gruenbacher | e307f35 | 2011-03-22 10:55:48 +0100 | [diff] [blame] | 714 | } |
| 715 | |
Lars Ellenberg | f399002 | 2011-03-23 14:31:09 +0100 | [diff] [blame] | 716 | int drbd_send_sync_param(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 717 | { |
Andreas Gruenbacher | 7c96715 | 2011-03-22 00:49:36 +0100 | [diff] [blame] | 718 | struct drbd_socket *sock; |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 719 | struct p_rs_param_95 *p; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 720 | int size; |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 721 | const int apv = mdev->tconn->agreed_pro_version; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 722 | enum drbd_packet cmd; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 723 | struct net_conf *nc; |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 724 | struct disk_conf *dc; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 725 | |
| 726 | sock = &mdev->tconn->data; |
| 727 | p = drbd_prepare_command(mdev, sock); |
| 728 | if (!p) |
| 729 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 730 | |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 731 | rcu_read_lock(); |
| 732 | nc = rcu_dereference(mdev->tconn->net_conf); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 733 | |
| 734 | size = apv <= 87 ? sizeof(struct p_rs_param) |
| 735 | : apv == 88 ? sizeof(struct p_rs_param) |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 736 | + strlen(nc->verify_alg) + 1 |
Philipp Reisner | 8e26f9c | 2010-07-06 17:25:54 +0200 | [diff] [blame] | 737 | : apv <= 94 ? sizeof(struct p_rs_param_89) |
| 738 | : /* apv >= 95 */ sizeof(struct p_rs_param_95); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 739 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 740 | cmd = apv >= 89 ? P_SYNC_PARAM89 : P_SYNC_PARAM; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 741 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 742 | /* initialize verify_alg and csums_alg */ |
| 743 | memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 744 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 745 | if (get_ldev(mdev)) { |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 746 | dc = rcu_dereference(mdev->ldev->disk_conf); |
Andreas Gruenbacher | 6394b93 | 2011-05-11 14:29:52 +0200 | [diff] [blame] | 747 | p->resync_rate = cpu_to_be32(dc->resync_rate); |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 748 | p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead); |
| 749 | p->c_delay_target = cpu_to_be32(dc->c_delay_target); |
| 750 | p->c_fill_target = cpu_to_be32(dc->c_fill_target); |
| 751 | p->c_max_rate = cpu_to_be32(dc->c_max_rate); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 752 | put_ldev(mdev); |
| 753 | } else { |
Andreas Gruenbacher | 6394b93 | 2011-05-11 14:29:52 +0200 | [diff] [blame] | 754 | p->resync_rate = cpu_to_be32(DRBD_RESYNC_RATE_DEF); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 755 | p->c_plan_ahead = cpu_to_be32(DRBD_C_PLAN_AHEAD_DEF); |
| 756 | p->c_delay_target = cpu_to_be32(DRBD_C_DELAY_TARGET_DEF); |
| 757 | p->c_fill_target = cpu_to_be32(DRBD_C_FILL_TARGET_DEF); |
| 758 | p->c_max_rate = cpu_to_be32(DRBD_C_MAX_RATE_DEF); |
| 759 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 760 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 761 | if (apv >= 88) |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 762 | strcpy(p->verify_alg, nc->verify_alg); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 763 | if (apv >= 89) |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 764 | strcpy(p->csums_alg, nc->csums_alg); |
| 765 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 766 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 767 | return drbd_send_command(mdev, sock, cmd, size, NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 768 | } |
| 769 | |
Philipp Reisner | d659f2a | 2011-05-16 17:38:45 +0200 | [diff] [blame] | 770 | int __drbd_send_protocol(struct drbd_tconn *tconn, enum drbd_packet cmd) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 771 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 772 | struct drbd_socket *sock; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 773 | struct p_protocol *p; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 774 | struct net_conf *nc; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 775 | int size, cf; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 776 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 777 | sock = &tconn->data; |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 778 | p = __conn_prepare_command(tconn, sock); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 779 | if (!p) |
| 780 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 781 | |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 782 | rcu_read_lock(); |
| 783 | nc = rcu_dereference(tconn->net_conf); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 784 | |
Andreas Gruenbacher | 6dff290 | 2011-06-28 14:18:12 +0200 | [diff] [blame] | 785 | if (nc->tentative && tconn->agreed_pro_version < 92) { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 786 | rcu_read_unlock(); |
| 787 | mutex_unlock(&sock->mutex); |
| 788 | conn_err(tconn, "--dry-run is not supported by peer"); |
| 789 | return -EOPNOTSUPP; |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 790 | } |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 791 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 792 | size = sizeof(*p); |
Philipp Reisner | dc8228d | 2011-02-08 10:13:15 +0100 | [diff] [blame] | 793 | if (tconn->agreed_pro_version >= 87) |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 794 | size += strlen(nc->integrity_alg) + 1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 795 | |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 796 | p->protocol = cpu_to_be32(nc->wire_protocol); |
| 797 | p->after_sb_0p = cpu_to_be32(nc->after_sb_0p); |
| 798 | p->after_sb_1p = cpu_to_be32(nc->after_sb_1p); |
| 799 | p->after_sb_2p = cpu_to_be32(nc->after_sb_2p); |
| 800 | p->two_primaries = cpu_to_be32(nc->two_primaries); |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 801 | cf = 0; |
Andreas Gruenbacher | 6139f60 | 2011-05-06 20:00:02 +0200 | [diff] [blame] | 802 | if (nc->discard_my_data) |
| 803 | cf |= CF_DISCARD_MY_DATA; |
Andreas Gruenbacher | 6dff290 | 2011-06-28 14:18:12 +0200 | [diff] [blame] | 804 | if (nc->tentative) |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 805 | cf |= CF_DRY_RUN; |
Philipp Reisner | cf14c2e | 2010-02-02 21:03:50 +0100 | [diff] [blame] | 806 | p->conn_flags = cpu_to_be32(cf); |
| 807 | |
Philipp Reisner | dc8228d | 2011-02-08 10:13:15 +0100 | [diff] [blame] | 808 | if (tconn->agreed_pro_version >= 87) |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 809 | strcpy(p->integrity_alg, nc->integrity_alg); |
| 810 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 811 | |
Philipp Reisner | d659f2a | 2011-05-16 17:38:45 +0200 | [diff] [blame] | 812 | return __conn_send_command(tconn, sock, cmd, size, NULL, 0); |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 813 | } |
| 814 | |
| 815 | int drbd_send_protocol(struct drbd_tconn *tconn) |
| 816 | { |
| 817 | int err; |
| 818 | |
| 819 | mutex_lock(&tconn->data.mutex); |
Philipp Reisner | d659f2a | 2011-05-16 17:38:45 +0200 | [diff] [blame] | 820 | err = __drbd_send_protocol(tconn, P_PROTOCOL); |
Andreas Gruenbacher | a7eb7bd | 2011-04-29 13:19:58 +0200 | [diff] [blame] | 821 | mutex_unlock(&tconn->data.mutex); |
| 822 | |
| 823 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 824 | } |
| 825 | |
| 826 | int _drbd_send_uuids(struct drbd_conf *mdev, u64 uuid_flags) |
| 827 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 828 | struct drbd_socket *sock; |
| 829 | struct p_uuids *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 830 | int i; |
| 831 | |
| 832 | if (!get_ldev_if_state(mdev, D_NEGOTIATING)) |
Andreas Gruenbacher | 2ae5f95 | 2011-03-16 01:07:20 +0100 | [diff] [blame] | 833 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 834 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 835 | sock = &mdev->tconn->data; |
| 836 | p = drbd_prepare_command(mdev, sock); |
| 837 | if (!p) { |
| 838 | put_ldev(mdev); |
| 839 | return -EIO; |
| 840 | } |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 841 | spin_lock_irq(&mdev->ldev->md.uuid_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 842 | for (i = UI_CURRENT; i < UI_SIZE; i++) |
Philipp Reisner | 298307e | 2012-11-16 12:27:41 +0100 | [diff] [blame] | 843 | p->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 844 | spin_unlock_irq(&mdev->ldev->md.uuid_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 845 | |
| 846 | mdev->comm_bm_set = drbd_bm_total_weight(mdev); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 847 | p->uuid[UI_SIZE] = cpu_to_be64(mdev->comm_bm_set); |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 848 | rcu_read_lock(); |
Andreas Gruenbacher | 6139f60 | 2011-05-06 20:00:02 +0200 | [diff] [blame] | 849 | uuid_flags |= rcu_dereference(mdev->tconn->net_conf)->discard_my_data ? 1 : 0; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 850 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 851 | uuid_flags |= test_bit(CRASHED_PRIMARY, &mdev->flags) ? 2 : 0; |
| 852 | uuid_flags |= mdev->new_state_tmp.disk == D_INCONSISTENT ? 4 : 0; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 853 | p->uuid[UI_FLAGS] = cpu_to_be64(uuid_flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 854 | |
| 855 | put_ldev(mdev); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 856 | return drbd_send_command(mdev, sock, P_UUIDS, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 857 | } |
| 858 | |
| 859 | int drbd_send_uuids(struct drbd_conf *mdev) |
| 860 | { |
| 861 | return _drbd_send_uuids(mdev, 0); |
| 862 | } |
| 863 | |
| 864 | int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev) |
| 865 | { |
| 866 | return _drbd_send_uuids(mdev, 8); |
| 867 | } |
| 868 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 869 | void drbd_print_uuids(struct drbd_conf *mdev, const char *text) |
| 870 | { |
| 871 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| 872 | u64 *uuid = mdev->ldev->md.uuid; |
| 873 | dev_info(DEV, "%s %016llX:%016llX:%016llX:%016llX\n", |
| 874 | text, |
| 875 | (unsigned long long)uuid[UI_CURRENT], |
| 876 | (unsigned long long)uuid[UI_BITMAP], |
| 877 | (unsigned long long)uuid[UI_HISTORY_START], |
| 878 | (unsigned long long)uuid[UI_HISTORY_END]); |
| 879 | put_ldev(mdev); |
| 880 | } else { |
| 881 | dev_info(DEV, "%s effective data uuid: %016llX\n", |
| 882 | text, |
| 883 | (unsigned long long)mdev->ed_uuid); |
| 884 | } |
| 885 | } |
| 886 | |
Andreas Gruenbacher | 9c1b7f7 | 2011-03-16 01:09:01 +0100 | [diff] [blame] | 887 | void drbd_gen_and_send_sync_uuid(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 888 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 889 | struct drbd_socket *sock; |
| 890 | struct p_rs_uuid *p; |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 891 | u64 uuid; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 892 | |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 893 | D_ASSERT(mdev->state.disk == D_UP_TO_DATE); |
| 894 | |
Philipp Reisner | 5ba3dac | 2011-10-05 15:54:18 +0200 | [diff] [blame] | 895 | uuid = mdev->ldev->md.uuid[UI_BITMAP]; |
| 896 | if (uuid && uuid != UUID_JUST_CREATED) |
| 897 | uuid = uuid + UUID_NEW_BM_OFFSET; |
| 898 | else |
| 899 | get_random_bytes(&uuid, sizeof(u64)); |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 900 | drbd_uuid_set(mdev, UI_BITMAP, uuid); |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 901 | drbd_print_uuids(mdev, "updated sync UUID"); |
Lars Ellenberg | 5a22db8 | 2010-12-17 21:14:23 +0100 | [diff] [blame] | 902 | drbd_md_sync(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 903 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 904 | sock = &mdev->tconn->data; |
| 905 | p = drbd_prepare_command(mdev, sock); |
| 906 | if (p) { |
| 907 | p->uuid = cpu_to_be64(uuid); |
| 908 | drbd_send_command(mdev, sock, P_SYNC_UUID, sizeof(*p), NULL, 0); |
| 909 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 910 | } |
| 911 | |
Philipp Reisner | e89b591 | 2010-03-24 17:11:33 +0100 | [diff] [blame] | 912 | int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 913 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 914 | struct drbd_socket *sock; |
| 915 | struct p_sizes *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 916 | sector_t d_size, u_size; |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 917 | int q_order_type; |
| 918 | unsigned int max_bio_size; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 919 | |
| 920 | if (get_ldev_if_state(mdev, D_NEGOTIATING)) { |
| 921 | D_ASSERT(mdev->ldev->backing_bdev); |
| 922 | d_size = drbd_get_max_capacity(mdev->ldev); |
Philipp Reisner | daeda1c | 2011-05-03 15:00:55 +0200 | [diff] [blame] | 923 | rcu_read_lock(); |
| 924 | u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size; |
| 925 | rcu_read_unlock(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 926 | q_order_type = drbd_queue_order_type(mdev); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 927 | max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9; |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 928 | max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 929 | put_ldev(mdev); |
| 930 | } else { |
| 931 | d_size = 0; |
| 932 | u_size = 0; |
| 933 | q_order_type = QUEUE_ORDERED_NONE; |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 934 | max_bio_size = DRBD_MAX_BIO_SIZE; /* ... multiple BIOs per peer_request */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 935 | } |
| 936 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 937 | sock = &mdev->tconn->data; |
| 938 | p = drbd_prepare_command(mdev, sock); |
| 939 | if (!p) |
| 940 | return -EIO; |
Philipp Reisner | 2ffca4f | 2011-06-30 15:43:06 +0200 | [diff] [blame] | 941 | |
| 942 | if (mdev->tconn->agreed_pro_version <= 94) |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 943 | max_bio_size = min(max_bio_size, DRBD_MAX_SIZE_H80_PACKET); |
Philipp Reisner | 2ffca4f | 2011-06-30 15:43:06 +0200 | [diff] [blame] | 944 | else if (mdev->tconn->agreed_pro_version < 100) |
Philipp Reisner | 9868365 | 2012-11-09 14:18:43 +0100 | [diff] [blame] | 945 | max_bio_size = min(max_bio_size, DRBD_MAX_BIO_SIZE_P95); |
Philipp Reisner | 6809384 | 2011-06-30 15:43:06 +0200 | [diff] [blame] | 946 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 947 | p->d_size = cpu_to_be64(d_size); |
| 948 | p->u_size = cpu_to_be64(u_size); |
| 949 | p->c_size = cpu_to_be64(trigger_reply ? 0 : drbd_get_capacity(mdev->this_bdev)); |
| 950 | p->max_bio_size = cpu_to_be32(max_bio_size); |
| 951 | p->queue_order_type = cpu_to_be16(q_order_type); |
| 952 | p->dds_flags = cpu_to_be16(flags); |
| 953 | return drbd_send_command(mdev, sock, P_SIZES, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 954 | } |
| 955 | |
| 956 | /** |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 957 | * drbd_send_current_state() - Sends the drbd state to the peer |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 958 | * @mdev: DRBD device. |
| 959 | */ |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 960 | int drbd_send_current_state(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 961 | { |
Andreas Gruenbacher | 7c96715 | 2011-03-22 00:49:36 +0100 | [diff] [blame] | 962 | struct drbd_socket *sock; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 963 | struct p_state *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 964 | |
Andreas Gruenbacher | 7c96715 | 2011-03-22 00:49:36 +0100 | [diff] [blame] | 965 | sock = &mdev->tconn->data; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 966 | p = drbd_prepare_command(mdev, sock); |
| 967 | if (!p) |
| 968 | return -EIO; |
| 969 | p->state = cpu_to_be32(mdev->state.i); /* Within the send mutex */ |
| 970 | return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 971 | } |
| 972 | |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 973 | /** |
| 974 | * drbd_send_state() - After a state change, sends the new state to the peer |
Philipp Reisner | 43de7c8 | 2011-11-10 13:16:13 +0100 | [diff] [blame] | 975 | * @mdev: DRBD device. |
| 976 | * @state: the state to send, not necessarily the current state. |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 977 | * |
| 978 | * Each state change queues an "after_state_ch" work, which will eventually |
| 979 | * send the resulting new state to the peer. If more state changes happen |
| 980 | * between queuing and processing of the after_state_ch work, we still |
| 981 | * want to send each intermediary state in the order it occurred. |
| 982 | */ |
| 983 | int drbd_send_state(struct drbd_conf *mdev, union drbd_state state) |
| 984 | { |
Philipp Reisner | 43de7c8 | 2011-11-10 13:16:13 +0100 | [diff] [blame] | 985 | struct drbd_socket *sock; |
| 986 | struct p_state *p; |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 987 | |
Philipp Reisner | 43de7c8 | 2011-11-10 13:16:13 +0100 | [diff] [blame] | 988 | sock = &mdev->tconn->data; |
| 989 | p = drbd_prepare_command(mdev, sock); |
| 990 | if (!p) |
| 991 | return -EIO; |
| 992 | p->state = cpu_to_be32(state.i); /* Within the send mutex */ |
| 993 | return drbd_send_command(mdev, sock, P_STATE, sizeof(*p), NULL, 0); |
| 994 | } |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 995 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 996 | int drbd_send_state_req(struct drbd_conf *mdev, union drbd_state mask, union drbd_state val) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 997 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 998 | struct drbd_socket *sock; |
| 999 | struct p_req_state *p; |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 1000 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1001 | sock = &mdev->tconn->data; |
| 1002 | p = drbd_prepare_command(mdev, sock); |
| 1003 | if (!p) |
| 1004 | return -EIO; |
| 1005 | p->mask = cpu_to_be32(mask.i); |
| 1006 | p->val = cpu_to_be32(val.i); |
| 1007 | return drbd_send_command(mdev, sock, P_STATE_CHG_REQ, sizeof(*p), NULL, 0); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1008 | } |
| 1009 | |
| 1010 | int conn_send_state_req(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state val) |
| 1011 | { |
| 1012 | enum drbd_packet cmd; |
| 1013 | struct drbd_socket *sock; |
| 1014 | struct p_req_state *p; |
| 1015 | |
| 1016 | cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REQ : P_CONN_ST_CHG_REQ; |
| 1017 | sock = &tconn->data; |
| 1018 | p = conn_prepare_command(tconn, sock); |
| 1019 | if (!p) |
| 1020 | return -EIO; |
| 1021 | p->mask = cpu_to_be32(mask.i); |
| 1022 | p->val = cpu_to_be32(val.i); |
| 1023 | return conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1024 | } |
| 1025 | |
Andreas Gruenbacher | 2f4e7ab | 2011-03-16 01:20:38 +0100 | [diff] [blame] | 1026 | void drbd_send_sr_reply(struct drbd_conf *mdev, enum drbd_state_rv retcode) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1027 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1028 | struct drbd_socket *sock; |
| 1029 | struct p_req_state_reply *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1030 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1031 | sock = &mdev->tconn->meta; |
| 1032 | p = drbd_prepare_command(mdev, sock); |
| 1033 | if (p) { |
| 1034 | p->retcode = cpu_to_be32(retcode); |
| 1035 | drbd_send_command(mdev, sock, P_STATE_CHG_REPLY, sizeof(*p), NULL, 0); |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 1036 | } |
Lars Ellenberg | f479ea0 | 2011-10-27 16:52:30 +0200 | [diff] [blame] | 1037 | } |
| 1038 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1039 | void conn_send_sr_reply(struct drbd_tconn *tconn, enum drbd_state_rv retcode) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1040 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1041 | struct drbd_socket *sock; |
| 1042 | struct p_req_state_reply *p; |
Philipp Reisner | 047cd4a | 2011-02-15 11:09:33 +0100 | [diff] [blame] | 1043 | enum drbd_packet cmd = tconn->agreed_pro_version < 100 ? P_STATE_CHG_REPLY : P_CONN_ST_CHG_REPLY; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1044 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1045 | sock = &tconn->meta; |
| 1046 | p = conn_prepare_command(tconn, sock); |
| 1047 | if (p) { |
| 1048 | p->retcode = cpu_to_be32(retcode); |
| 1049 | conn_send_command(tconn, sock, cmd, sizeof(*p), NULL, 0); |
| 1050 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1051 | } |
| 1052 | |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1053 | static void dcbp_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1054 | { |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1055 | BUG_ON(code & ~0xf); |
| 1056 | p->encoding = (p->encoding & ~0xf) | code; |
| 1057 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1058 | |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1059 | static void dcbp_set_start(struct p_compressed_bm *p, int set) |
| 1060 | { |
| 1061 | p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); |
| 1062 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1063 | |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1064 | static void dcbp_set_pad_bits(struct p_compressed_bm *p, int n) |
| 1065 | { |
| 1066 | BUG_ON(n & ~0x7); |
| 1067 | p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1068 | } |
| 1069 | |
| 1070 | int fill_bitmap_rle_bits(struct drbd_conf *mdev, |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1071 | struct p_compressed_bm *p, |
| 1072 | unsigned int size, |
| 1073 | struct bm_xfer_ctx *c) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1074 | { |
| 1075 | struct bitstream bs; |
| 1076 | unsigned long plain_bits; |
| 1077 | unsigned long tmp; |
| 1078 | unsigned long rl; |
| 1079 | unsigned len; |
| 1080 | unsigned toggle; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1081 | int bits, use_rle; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1082 | |
| 1083 | /* may we use this feature? */ |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1084 | rcu_read_lock(); |
| 1085 | use_rle = rcu_dereference(mdev->tconn->net_conf)->use_rle; |
| 1086 | rcu_read_unlock(); |
| 1087 | if (!use_rle || mdev->tconn->agreed_pro_version < 90) |
| 1088 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1089 | |
| 1090 | if (c->bit_offset >= c->bm_bits) |
| 1091 | return 0; /* nothing to do. */ |
| 1092 | |
| 1093 | /* use at most thus many bytes */ |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1094 | bitstream_init(&bs, p->code, size, 0); |
| 1095 | memset(p->code, 0, size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1096 | /* plain bits covered in this code string */ |
| 1097 | plain_bits = 0; |
| 1098 | |
| 1099 | /* p->encoding & 0x80 stores whether the first run length is set. |
| 1100 | * bit offset is implicit. |
| 1101 | * start with toggle == 2 to be able to tell the first iteration */ |
| 1102 | toggle = 2; |
| 1103 | |
| 1104 | /* see how much plain bits we can stuff into one packet |
| 1105 | * using RLE and VLI. */ |
| 1106 | do { |
| 1107 | tmp = (toggle == 0) ? _drbd_bm_find_next_zero(mdev, c->bit_offset) |
| 1108 | : _drbd_bm_find_next(mdev, c->bit_offset); |
| 1109 | if (tmp == -1UL) |
| 1110 | tmp = c->bm_bits; |
| 1111 | rl = tmp - c->bit_offset; |
| 1112 | |
| 1113 | if (toggle == 2) { /* first iteration */ |
| 1114 | if (rl == 0) { |
| 1115 | /* the first checked bit was set, |
| 1116 | * store start value, */ |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1117 | dcbp_set_start(p, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1118 | /* but skip encoding of zero run length */ |
| 1119 | toggle = !toggle; |
| 1120 | continue; |
| 1121 | } |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1122 | dcbp_set_start(p, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1123 | } |
| 1124 | |
| 1125 | /* paranoia: catch zero runlength. |
| 1126 | * can only happen if bitmap is modified while we scan it. */ |
| 1127 | if (rl == 0) { |
| 1128 | dev_err(DEV, "unexpected zero runlength while encoding bitmap " |
| 1129 | "t:%u bo:%lu\n", toggle, c->bit_offset); |
| 1130 | return -1; |
| 1131 | } |
| 1132 | |
| 1133 | bits = vli_encode_bits(&bs, rl); |
| 1134 | if (bits == -ENOBUFS) /* buffer full */ |
| 1135 | break; |
| 1136 | if (bits <= 0) { |
| 1137 | dev_err(DEV, "error while encoding bitmap: %d\n", bits); |
| 1138 | return 0; |
| 1139 | } |
| 1140 | |
| 1141 | toggle = !toggle; |
| 1142 | plain_bits += rl; |
| 1143 | c->bit_offset = tmp; |
| 1144 | } while (c->bit_offset < c->bm_bits); |
| 1145 | |
| 1146 | len = bs.cur.b - p->code + !!bs.cur.bit; |
| 1147 | |
| 1148 | if (plain_bits < (len << 3)) { |
| 1149 | /* incompressible with this method. |
| 1150 | * we need to rewind both word and bit position. */ |
| 1151 | c->bit_offset -= plain_bits; |
| 1152 | bm_xfer_ctx_bit_to_word_offset(c); |
| 1153 | c->bit_offset = c->word_offset * BITS_PER_LONG; |
| 1154 | return 0; |
| 1155 | } |
| 1156 | |
| 1157 | /* RLE + VLI was able to compress it just fine. |
| 1158 | * update c->word_offset. */ |
| 1159 | bm_xfer_ctx_bit_to_word_offset(c); |
| 1160 | |
| 1161 | /* store pad_bits */ |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1162 | dcbp_set_pad_bits(p, (8 - bs.cur.bit) & 0x7); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1163 | |
| 1164 | return len; |
| 1165 | } |
| 1166 | |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1167 | /** |
| 1168 | * send_bitmap_rle_or_plain |
| 1169 | * |
| 1170 | * Return 0 when done, 1 when another iteration is needed, and a negative error |
| 1171 | * code upon failure. |
| 1172 | */ |
| 1173 | static int |
Andreas Gruenbacher | 79ed9bd | 2011-03-24 21:31:38 +0100 | [diff] [blame] | 1174 | send_bitmap_rle_or_plain(struct drbd_conf *mdev, struct bm_xfer_ctx *c) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1175 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1176 | struct drbd_socket *sock = &mdev->tconn->data; |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1177 | unsigned int header_size = drbd_header_size(mdev->tconn); |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1178 | struct p_compressed_bm *p = sock->sbuf + header_size; |
Andreas Gruenbacher | a982dd5 | 2010-12-10 00:45:25 +0100 | [diff] [blame] | 1179 | int len, err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1180 | |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1181 | len = fill_bitmap_rle_bits(mdev, p, |
| 1182 | DRBD_SOCKET_BUFFER_SIZE - header_size - sizeof(*p), c); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1183 | if (len < 0) |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1184 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1185 | |
| 1186 | if (len) { |
Andreas Gruenbacher | a02d124 | 2011-03-22 17:20:45 +0100 | [diff] [blame] | 1187 | dcbp_set_code(p, RLE_VLI_Bits); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1188 | err = __send_command(mdev->tconn, mdev->vnr, sock, |
| 1189 | P_COMPRESSED_BITMAP, sizeof(*p) + len, |
| 1190 | NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1191 | c->packets[0]++; |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1192 | c->bytes[0] += header_size + sizeof(*p) + len; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1193 | |
| 1194 | if (c->bit_offset >= c->bm_bits) |
| 1195 | len = 0; /* DONE */ |
| 1196 | } else { |
| 1197 | /* was not compressible. |
| 1198 | * send a buffer full of plain text bits instead. */ |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1199 | unsigned int data_size; |
| 1200 | unsigned long num_words; |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1201 | unsigned long *p = sock->sbuf + header_size; |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1202 | |
| 1203 | data_size = DRBD_SOCKET_BUFFER_SIZE - header_size; |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1204 | num_words = min_t(size_t, data_size / sizeof(*p), |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1205 | c->bm_words - c->word_offset); |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1206 | len = num_words * sizeof(*p); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1207 | if (len) |
Andreas Gruenbacher | e658983 | 2011-03-30 12:54:42 +0200 | [diff] [blame] | 1208 | drbd_bm_get_lel(mdev, c->word_offset, num_words, p); |
| 1209 | err = __send_command(mdev->tconn, mdev->vnr, sock, P_BITMAP, len, NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1210 | c->word_offset += num_words; |
| 1211 | c->bit_offset = c->word_offset * BITS_PER_LONG; |
| 1212 | |
| 1213 | c->packets[1]++; |
Andreas Gruenbacher | 50d0b1a | 2011-03-30 11:53:51 +0200 | [diff] [blame] | 1214 | c->bytes[1] += header_size + len; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1215 | |
| 1216 | if (c->bit_offset > c->bm_bits) |
| 1217 | c->bit_offset = c->bm_bits; |
| 1218 | } |
Andreas Gruenbacher | a982dd5 | 2010-12-10 00:45:25 +0100 | [diff] [blame] | 1219 | if (!err) { |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1220 | if (len == 0) { |
| 1221 | INFO_bm_xfer_stats(mdev, "send", c); |
| 1222 | return 0; |
| 1223 | } else |
| 1224 | return 1; |
| 1225 | } |
| 1226 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1227 | } |
| 1228 | |
| 1229 | /* See the comment at receive_bitmap() */ |
Andreas Gruenbacher | 058820c | 2011-03-22 16:03:43 +0100 | [diff] [blame] | 1230 | static int _drbd_send_bitmap(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1231 | { |
| 1232 | struct bm_xfer_ctx c; |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1233 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1234 | |
Andreas Gruenbacher | 841ce24 | 2010-12-15 19:31:20 +0100 | [diff] [blame] | 1235 | if (!expect(mdev->bitmap)) |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1236 | return false; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1237 | |
| 1238 | if (get_ldev(mdev)) { |
| 1239 | if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) { |
| 1240 | dev_info(DEV, "Writing the whole bitmap, MDF_FullSync was set.\n"); |
| 1241 | drbd_bm_set_all(mdev); |
| 1242 | if (drbd_bm_write(mdev)) { |
| 1243 | /* write_bm did fail! Leave full sync flag set in Meta P_DATA |
| 1244 | * but otherwise process as per normal - need to tell other |
| 1245 | * side that a full resync is required! */ |
| 1246 | dev_err(DEV, "Failed to write bitmap to disk!\n"); |
| 1247 | } else { |
| 1248 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); |
| 1249 | drbd_md_sync(mdev); |
| 1250 | } |
| 1251 | } |
| 1252 | put_ldev(mdev); |
| 1253 | } |
| 1254 | |
| 1255 | c = (struct bm_xfer_ctx) { |
| 1256 | .bm_bits = drbd_bm_bits(mdev), |
| 1257 | .bm_words = drbd_bm_words(mdev), |
| 1258 | }; |
| 1259 | |
| 1260 | do { |
Andreas Gruenbacher | 79ed9bd | 2011-03-24 21:31:38 +0100 | [diff] [blame] | 1261 | err = send_bitmap_rle_or_plain(mdev, &c); |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1262 | } while (err > 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1263 | |
Andreas Gruenbacher | f70af11 | 2010-12-11 18:51:50 +0100 | [diff] [blame] | 1264 | return err == 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1265 | } |
| 1266 | |
| 1267 | int drbd_send_bitmap(struct drbd_conf *mdev) |
| 1268 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1269 | struct drbd_socket *sock = &mdev->tconn->data; |
| 1270 | int err = -1; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1271 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1272 | mutex_lock(&sock->mutex); |
| 1273 | if (sock->socket) |
| 1274 | err = !_drbd_send_bitmap(mdev); |
| 1275 | mutex_unlock(&sock->mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1276 | return err; |
| 1277 | } |
| 1278 | |
Lars Ellenberg | 9ed57dc | 2012-03-26 20:55:17 +0200 | [diff] [blame] | 1279 | void drbd_send_b_ack(struct drbd_tconn *tconn, u32 barrier_nr, u32 set_size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1280 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1281 | struct drbd_socket *sock; |
| 1282 | struct p_barrier_ack *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1283 | |
Lars Ellenberg | 9ed57dc | 2012-03-26 20:55:17 +0200 | [diff] [blame] | 1284 | if (tconn->cstate < C_WF_REPORT_PARAMS) |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1285 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1286 | |
Lars Ellenberg | 9ed57dc | 2012-03-26 20:55:17 +0200 | [diff] [blame] | 1287 | sock = &tconn->meta; |
| 1288 | p = conn_prepare_command(tconn, sock); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1289 | if (!p) |
| 1290 | return; |
| 1291 | p->barrier = barrier_nr; |
| 1292 | p->set_size = cpu_to_be32(set_size); |
Lars Ellenberg | 9ed57dc | 2012-03-26 20:55:17 +0200 | [diff] [blame] | 1293 | conn_send_command(tconn, sock, P_BARRIER_ACK, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1294 | } |
| 1295 | |
| 1296 | /** |
| 1297 | * _drbd_send_ack() - Sends an ack packet |
| 1298 | * @mdev: DRBD device. |
| 1299 | * @cmd: Packet command code. |
| 1300 | * @sector: sector, needs to be in big endian byte order |
| 1301 | * @blksize: size in byte, needs to be in big endian byte order |
| 1302 | * @block_id: Id, big endian byte order |
| 1303 | */ |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1304 | static int _drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, |
| 1305 | u64 sector, u32 blksize, u64 block_id) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1306 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1307 | struct drbd_socket *sock; |
| 1308 | struct p_block_ack *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1309 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1310 | if (mdev->state.conn < C_CONNECTED) |
Andreas Gruenbacher | a8c32aa | 2011-03-16 01:27:22 +0100 | [diff] [blame] | 1311 | return -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1312 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1313 | sock = &mdev->tconn->meta; |
| 1314 | p = drbd_prepare_command(mdev, sock); |
| 1315 | if (!p) |
| 1316 | return -EIO; |
| 1317 | p->sector = sector; |
| 1318 | p->block_id = block_id; |
| 1319 | p->blksize = blksize; |
| 1320 | p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq)); |
| 1321 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1322 | } |
| 1323 | |
Lars Ellenberg | 2b2bf21 | 2010-10-06 11:46:55 +0200 | [diff] [blame] | 1324 | /* dp->sector and dp->block_id already/still in network byte order, |
| 1325 | * data_size is payload size according to dp->head, |
| 1326 | * and may need to be corrected for digest size. */ |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1327 | void drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packet cmd, |
| 1328 | struct p_data *dp, int data_size) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1329 | { |
Andreas Gruenbacher | 88104ca | 2011-04-28 21:47:21 +0200 | [diff] [blame] | 1330 | if (mdev->tconn->peer_integrity_tfm) |
| 1331 | data_size -= crypto_hash_digestsize(mdev->tconn->peer_integrity_tfm); |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1332 | _drbd_send_ack(mdev, cmd, dp->sector, cpu_to_be32(data_size), |
| 1333 | dp->block_id); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1334 | } |
| 1335 | |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1336 | void drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packet cmd, |
| 1337 | struct p_block_req *rp) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1338 | { |
Andreas Gruenbacher | a9a9994 | 2011-03-16 01:30:14 +0100 | [diff] [blame] | 1339 | _drbd_send_ack(mdev, cmd, rp->sector, rp->blksize, rp->block_id); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | /** |
| 1343 | * drbd_send_ack() - Sends an ack packet |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1344 | * @mdev: DRBD device |
| 1345 | * @cmd: packet command code |
| 1346 | * @peer_req: peer request |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1347 | */ |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1348 | int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packet cmd, |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1349 | struct drbd_peer_request *peer_req) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1350 | { |
| 1351 | return _drbd_send_ack(mdev, cmd, |
Andreas Gruenbacher | dd51612 | 2011-03-16 15:39:08 +0100 | [diff] [blame] | 1352 | cpu_to_be64(peer_req->i.sector), |
| 1353 | cpu_to_be32(peer_req->i.size), |
| 1354 | peer_req->block_id); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1355 | } |
| 1356 | |
| 1357 | /* This function misuses the block_id field to signal if the blocks |
| 1358 | * are is sync or not. */ |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1359 | int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packet cmd, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1360 | sector_t sector, int blksize, u64 block_id) |
| 1361 | { |
| 1362 | return _drbd_send_ack(mdev, cmd, |
| 1363 | cpu_to_be64(sector), |
| 1364 | cpu_to_be32(blksize), |
| 1365 | cpu_to_be64(block_id)); |
| 1366 | } |
| 1367 | |
| 1368 | int drbd_send_drequest(struct drbd_conf *mdev, int cmd, |
| 1369 | sector_t sector, int size, u64 block_id) |
| 1370 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1371 | struct drbd_socket *sock; |
| 1372 | struct p_block_req *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1373 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1374 | sock = &mdev->tconn->data; |
| 1375 | p = drbd_prepare_command(mdev, sock); |
| 1376 | if (!p) |
| 1377 | return -EIO; |
| 1378 | p->sector = cpu_to_be64(sector); |
| 1379 | p->block_id = block_id; |
| 1380 | p->blksize = cpu_to_be32(size); |
| 1381 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1382 | } |
| 1383 | |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1384 | int drbd_send_drequest_csum(struct drbd_conf *mdev, sector_t sector, int size, |
| 1385 | void *digest, int digest_size, enum drbd_packet cmd) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1386 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1387 | struct drbd_socket *sock; |
| 1388 | struct p_block_req *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1389 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1390 | /* FIXME: Put the digest into the preallocated socket buffer. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1391 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1392 | sock = &mdev->tconn->data; |
| 1393 | p = drbd_prepare_command(mdev, sock); |
| 1394 | if (!p) |
| 1395 | return -EIO; |
| 1396 | p->sector = cpu_to_be64(sector); |
| 1397 | p->block_id = ID_SYNCER /* unused */; |
| 1398 | p->blksize = cpu_to_be32(size); |
| 1399 | return drbd_send_command(mdev, sock, cmd, sizeof(*p), |
| 1400 | digest, digest_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1401 | } |
| 1402 | |
| 1403 | int drbd_send_ov_request(struct drbd_conf *mdev, sector_t sector, int size) |
| 1404 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1405 | struct drbd_socket *sock; |
| 1406 | struct p_block_req *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1407 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1408 | sock = &mdev->tconn->data; |
| 1409 | p = drbd_prepare_command(mdev, sock); |
| 1410 | if (!p) |
| 1411 | return -EIO; |
| 1412 | p->sector = cpu_to_be64(sector); |
| 1413 | p->block_id = ID_SYNCER /* unused */; |
| 1414 | p->blksize = cpu_to_be32(size); |
| 1415 | return drbd_send_command(mdev, sock, P_OV_REQUEST, sizeof(*p), NULL, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1416 | } |
| 1417 | |
| 1418 | /* called on sndtimeo |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1419 | * returns false if we should retry, |
| 1420 | * true if we think connection is dead |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1421 | */ |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1422 | static int we_should_drop_the_connection(struct drbd_tconn *tconn, struct socket *sock) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1423 | { |
| 1424 | int drop_it; |
| 1425 | /* long elapsed = (long)(jiffies - mdev->last_received); */ |
| 1426 | |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1427 | drop_it = tconn->meta.socket == sock |
| 1428 | || !tconn->asender.task |
| 1429 | || get_t_state(&tconn->asender) != RUNNING |
Philipp Reisner | bbeb641 | 2011-02-10 13:45:46 +0100 | [diff] [blame] | 1430 | || tconn->cstate < C_WF_REPORT_PARAMS; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1431 | |
| 1432 | if (drop_it) |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 1433 | return true; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1434 | |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1435 | drop_it = !--tconn->ko_count; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1436 | if (!drop_it) { |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1437 | conn_err(tconn, "[%s/%d] sock_sendmsg time expired, ko = %u\n", |
| 1438 | current->comm, current->pid, tconn->ko_count); |
| 1439 | request_ping(tconn); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1440 | } |
| 1441 | |
| 1442 | return drop_it; /* && (mdev->state == R_PRIMARY) */; |
| 1443 | } |
| 1444 | |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1445 | static void drbd_update_congested(struct drbd_tconn *tconn) |
Andreas Gruenbacher | 9e204cd | 2011-01-26 18:45:11 +0100 | [diff] [blame] | 1446 | { |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1447 | struct sock *sk = tconn->data.socket->sk; |
Andreas Gruenbacher | 9e204cd | 2011-01-26 18:45:11 +0100 | [diff] [blame] | 1448 | if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1449 | set_bit(NET_CONGESTED, &tconn->flags); |
Andreas Gruenbacher | 9e204cd | 2011-01-26 18:45:11 +0100 | [diff] [blame] | 1450 | } |
| 1451 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1452 | /* The idea of sendpage seems to be to put some kind of reference |
| 1453 | * to the page into the skb, and to hand it over to the NIC. In |
| 1454 | * this process get_page() gets called. |
| 1455 | * |
| 1456 | * As soon as the page was really sent over the network put_page() |
| 1457 | * gets called by some part of the network layer. [ NIC driver? ] |
| 1458 | * |
| 1459 | * [ get_page() / put_page() increment/decrement the count. If count |
| 1460 | * reaches 0 the page will be freed. ] |
| 1461 | * |
| 1462 | * This works nicely with pages from FSs. |
| 1463 | * But this means that in protocol A we might signal IO completion too early! |
| 1464 | * |
| 1465 | * In order not to corrupt data during a resync we must make sure |
| 1466 | * that we do not reuse our own buffer pages (EEs) to early, therefore |
| 1467 | * we have the net_ee list. |
| 1468 | * |
| 1469 | * XFS seems to have problems, still, it submits pages with page_count == 0! |
| 1470 | * As a workaround, we disable sendpage on pages |
| 1471 | * with page_count == 0 or PageSlab. |
| 1472 | */ |
| 1473 | static int _drbd_no_send_page(struct drbd_conf *mdev, struct page *page, |
Andreas Gruenbacher | b987427 | 2011-03-16 09:41:10 +0100 | [diff] [blame] | 1474 | int offset, size_t size, unsigned msg_flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1475 | { |
Andreas Gruenbacher | b987427 | 2011-03-16 09:41:10 +0100 | [diff] [blame] | 1476 | struct socket *socket; |
| 1477 | void *addr; |
| 1478 | int err; |
| 1479 | |
| 1480 | socket = mdev->tconn->data.socket; |
| 1481 | addr = kmap(page) + offset; |
| 1482 | err = drbd_send_all(mdev->tconn, socket, addr, size, msg_flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1483 | kunmap(page); |
Andreas Gruenbacher | b987427 | 2011-03-16 09:41:10 +0100 | [diff] [blame] | 1484 | if (!err) |
| 1485 | mdev->send_cnt += size >> 9; |
| 1486 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1487 | } |
| 1488 | |
| 1489 | static int _drbd_send_page(struct drbd_conf *mdev, struct page *page, |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1490 | int offset, size_t size, unsigned msg_flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1491 | { |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1492 | struct socket *socket = mdev->tconn->data.socket; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1493 | mm_segment_t oldfs = get_fs(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1494 | int len = size; |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1495 | int err = -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1496 | |
| 1497 | /* e.g. XFS meta- & log-data is in slab pages, which have a |
| 1498 | * page_count of 0 and/or have PageSlab() set. |
| 1499 | * we cannot use send_page for those, as that does get_page(); |
| 1500 | * put_page(); and would cause either a VM_BUG directly, or |
| 1501 | * __page_cache_release a page that would actually still be referenced |
| 1502 | * by someone, leading to some obscure delayed Oops somewhere else. */ |
| 1503 | if (disable_sendpage || (page_count(page) < 1) || PageSlab(page)) |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1504 | return _drbd_no_send_page(mdev, page, offset, size, msg_flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1505 | |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1506 | msg_flags |= MSG_NOSIGNAL; |
Philipp Reisner | 1a7ba64 | 2011-02-07 14:56:02 +0100 | [diff] [blame] | 1507 | drbd_update_congested(mdev->tconn); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1508 | set_fs(KERNEL_DS); |
| 1509 | do { |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1510 | int sent; |
| 1511 | |
| 1512 | sent = socket->ops->sendpage(socket, page, offset, len, msg_flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1513 | if (sent <= 0) { |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1514 | if (sent == -EAGAIN) { |
| 1515 | if (we_should_drop_the_connection(mdev->tconn, socket)) |
| 1516 | break; |
| 1517 | continue; |
| 1518 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1519 | dev_warn(DEV, "%s: size=%d len=%d sent=%d\n", |
| 1520 | __func__, (int)size, len, sent); |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1521 | if (sent < 0) |
| 1522 | err = sent; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1523 | break; |
| 1524 | } |
| 1525 | len -= sent; |
| 1526 | offset += sent; |
| 1527 | } while (len > 0 /* THINK && mdev->cstate >= C_CONNECTED*/); |
| 1528 | set_fs(oldfs); |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 1529 | clear_bit(NET_CONGESTED, &mdev->tconn->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1530 | |
Andreas Gruenbacher | 88b390f | 2011-03-16 10:44:16 +0100 | [diff] [blame] | 1531 | if (len == 0) { |
| 1532 | err = 0; |
| 1533 | mdev->send_cnt += size >> 9; |
| 1534 | } |
| 1535 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1536 | } |
| 1537 | |
| 1538 | static int _drbd_send_bio(struct drbd_conf *mdev, struct bio *bio) |
| 1539 | { |
| 1540 | struct bio_vec *bvec; |
| 1541 | int i; |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1542 | /* hint all but last page with MSG_MORE */ |
Lars Ellenberg | 001a886 | 2012-03-08 16:43:45 +0100 | [diff] [blame] | 1543 | bio_for_each_segment(bvec, bio, i) { |
Andreas Gruenbacher | 7fae55d | 2011-03-16 11:46:33 +0100 | [diff] [blame] | 1544 | int err; |
| 1545 | |
| 1546 | err = _drbd_no_send_page(mdev, bvec->bv_page, |
| 1547 | bvec->bv_offset, bvec->bv_len, |
| 1548 | i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); |
| 1549 | if (err) |
| 1550 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1551 | } |
Andreas Gruenbacher | 7fae55d | 2011-03-16 11:46:33 +0100 | [diff] [blame] | 1552 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | static int _drbd_send_zc_bio(struct drbd_conf *mdev, struct bio *bio) |
| 1556 | { |
| 1557 | struct bio_vec *bvec; |
| 1558 | int i; |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1559 | /* hint all but last page with MSG_MORE */ |
Lars Ellenberg | 001a886 | 2012-03-08 16:43:45 +0100 | [diff] [blame] | 1560 | bio_for_each_segment(bvec, bio, i) { |
Andreas Gruenbacher | 7fae55d | 2011-03-16 11:46:33 +0100 | [diff] [blame] | 1561 | int err; |
| 1562 | |
| 1563 | err = _drbd_send_page(mdev, bvec->bv_page, |
| 1564 | bvec->bv_offset, bvec->bv_len, |
| 1565 | i == bio->bi_vcnt - 1 ? 0 : MSG_MORE); |
| 1566 | if (err) |
| 1567 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1568 | } |
Andreas Gruenbacher | 7fae55d | 2011-03-16 11:46:33 +0100 | [diff] [blame] | 1569 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1570 | } |
| 1571 | |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1572 | static int _drbd_send_zc_ee(struct drbd_conf *mdev, |
| 1573 | struct drbd_peer_request *peer_req) |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1574 | { |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1575 | struct page *page = peer_req->pages; |
| 1576 | unsigned len = peer_req->i.size; |
Andreas Gruenbacher | 9f69230 | 2011-03-16 10:49:09 +0100 | [diff] [blame] | 1577 | int err; |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1578 | |
Lars Ellenberg | ba11ad9 | 2010-05-25 16:26:16 +0200 | [diff] [blame] | 1579 | /* hint all but last page with MSG_MORE */ |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1580 | page_chain_for_each(page) { |
| 1581 | unsigned l = min_t(unsigned, len, PAGE_SIZE); |
Andreas Gruenbacher | 9f69230 | 2011-03-16 10:49:09 +0100 | [diff] [blame] | 1582 | |
| 1583 | err = _drbd_send_page(mdev, page, 0, l, |
| 1584 | page_chain_next(page) ? MSG_MORE : 0); |
| 1585 | if (err) |
| 1586 | return err; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1587 | len -= l; |
| 1588 | } |
Andreas Gruenbacher | 9f69230 | 2011-03-16 10:49:09 +0100 | [diff] [blame] | 1589 | return 0; |
Lars Ellenberg | 45bb912 | 2010-05-14 17:10:48 +0200 | [diff] [blame] | 1590 | } |
| 1591 | |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 1592 | static u32 bio_flags_to_wire(struct drbd_conf *mdev, unsigned long bi_rw) |
| 1593 | { |
Philipp Reisner | 31890f4 | 2011-01-19 14:12:51 +0100 | [diff] [blame] | 1594 | if (mdev->tconn->agreed_pro_version >= 95) |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 1595 | return (bi_rw & REQ_SYNC ? DP_RW_SYNC : 0) | |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 1596 | (bi_rw & REQ_FUA ? DP_FUA : 0) | |
| 1597 | (bi_rw & REQ_FLUSH ? DP_FLUSH : 0) | |
| 1598 | (bi_rw & REQ_DISCARD ? DP_DISCARD : 0); |
| 1599 | else |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 1600 | return bi_rw & REQ_SYNC ? DP_RW_SYNC : 0; |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 1601 | } |
| 1602 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1603 | /* Used to send write requests |
| 1604 | * R_PRIMARY -> Peer (P_DATA) |
| 1605 | */ |
| 1606 | int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req) |
| 1607 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1608 | struct drbd_socket *sock; |
| 1609 | struct p_data *p; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1610 | unsigned int dp_flags = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1611 | int dgs; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1612 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1613 | |
Philipp Reisner | 46e1ce4 | 2011-05-16 12:57:15 +0200 | [diff] [blame] | 1614 | sock = &mdev->tconn->data; |
| 1615 | p = drbd_prepare_command(mdev, sock); |
Andreas Gruenbacher | 7d4c782 | 2011-07-17 23:06:12 +0200 | [diff] [blame] | 1616 | dgs = mdev->tconn->integrity_tfm ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1617 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1618 | if (!p) |
| 1619 | return -EIO; |
| 1620 | p->sector = cpu_to_be64(req->i.sector); |
| 1621 | p->block_id = (unsigned long)req; |
Lars Ellenberg | 5cdb0bf3 | 2012-03-26 16:21:25 +0200 | [diff] [blame] | 1622 | p->seq_num = cpu_to_be32(atomic_inc_return(&mdev->packet_seq)); |
Philipp Reisner | 76d2e7e | 2010-08-25 11:58:05 +0200 | [diff] [blame] | 1623 | dp_flags = bio_flags_to_wire(mdev, req->master_bio->bi_rw); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1624 | if (mdev->state.conn >= C_SYNC_SOURCE && |
| 1625 | mdev->state.conn <= C_PAUSED_SYNC_T) |
| 1626 | dp_flags |= DP_MAY_SET_IN_SYNC; |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 1627 | if (mdev->tconn->agreed_pro_version >= 100) { |
| 1628 | if (req->rq_state & RQ_EXP_RECEIVE_ACK) |
| 1629 | dp_flags |= DP_SEND_RECEIVE_ACK; |
| 1630 | if (req->rq_state & RQ_EXP_WRITE_ACK) |
| 1631 | dp_flags |= DP_SEND_WRITE_ACK; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1632 | } |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1633 | p->dp_flags = cpu_to_be32(dp_flags); |
| 1634 | if (dgs) |
Andreas Gruenbacher | 8d412fc | 2011-04-27 20:59:18 +0200 | [diff] [blame] | 1635 | drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, p + 1); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1636 | err = __send_command(mdev->tconn, mdev->vnr, sock, P_DATA, sizeof(*p) + dgs, NULL, req->i.size); |
Andreas Gruenbacher | 6bdb9b0 | 2011-03-16 11:52:58 +0100 | [diff] [blame] | 1637 | if (!err) { |
Lars Ellenberg | 470be44 | 2010-11-10 10:36:52 +0100 | [diff] [blame] | 1638 | /* For protocol A, we have to memcpy the payload into |
| 1639 | * socket buffers, as we may complete right away |
| 1640 | * as soon as we handed it over to tcp, at which point the data |
| 1641 | * pages may become invalid. |
| 1642 | * |
| 1643 | * For data-integrity enabled, we copy it as well, so we can be |
| 1644 | * sure that even if the bio pages may still be modified, it |
| 1645 | * won't change the data on the wire, thus if the digest checks |
| 1646 | * out ok after sending on this side, but does not fit on the |
| 1647 | * receiving side, we sure have detected corruption elsewhere. |
| 1648 | */ |
Philipp Reisner | 303d144 | 2011-04-13 16:24:47 -0700 | [diff] [blame] | 1649 | if (!(req->rq_state & (RQ_EXP_RECEIVE_ACK | RQ_EXP_WRITE_ACK)) || dgs) |
Andreas Gruenbacher | 6bdb9b0 | 2011-03-16 11:52:58 +0100 | [diff] [blame] | 1650 | err = _drbd_send_bio(mdev, req->master_bio); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1651 | else |
Andreas Gruenbacher | 6bdb9b0 | 2011-03-16 11:52:58 +0100 | [diff] [blame] | 1652 | err = _drbd_send_zc_bio(mdev, req->master_bio); |
Lars Ellenberg | 470be44 | 2010-11-10 10:36:52 +0100 | [diff] [blame] | 1653 | |
| 1654 | /* double check digest, sometimes buffers have been modified in flight. */ |
| 1655 | if (dgs > 0 && dgs <= 64) { |
Bart Van Assche | 24c4830 | 2011-05-21 18:32:29 +0200 | [diff] [blame] | 1656 | /* 64 byte, 512 bit, is the largest digest size |
Lars Ellenberg | 470be44 | 2010-11-10 10:36:52 +0100 | [diff] [blame] | 1657 | * currently supported in kernel crypto. */ |
| 1658 | unsigned char digest[64]; |
Andreas Gruenbacher | 8d412fc | 2011-04-27 20:59:18 +0200 | [diff] [blame] | 1659 | drbd_csum_bio(mdev, mdev->tconn->integrity_tfm, req->master_bio, digest); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1660 | if (memcmp(p + 1, digest, dgs)) { |
Lars Ellenberg | 470be44 | 2010-11-10 10:36:52 +0100 | [diff] [blame] | 1661 | dev_warn(DEV, |
| 1662 | "Digest mismatch, buffer modified by upper layers during write: %llus +%u\n", |
Andreas Gruenbacher | ace652a | 2011-01-03 17:09:58 +0100 | [diff] [blame] | 1663 | (unsigned long long)req->i.sector, req->i.size); |
Lars Ellenberg | 470be44 | 2010-11-10 10:36:52 +0100 | [diff] [blame] | 1664 | } |
| 1665 | } /* else if (dgs > 64) { |
| 1666 | ... Be noisy about digest too large ... |
| 1667 | } */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1668 | } |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1669 | mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1670 | |
Andreas Gruenbacher | 6bdb9b0 | 2011-03-16 11:52:58 +0100 | [diff] [blame] | 1671 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1672 | } |
| 1673 | |
| 1674 | /* answer packet, used to send data back for read requests: |
| 1675 | * Peer -> (diskless) R_PRIMARY (P_DATA_REPLY) |
| 1676 | * C_SYNC_SOURCE -> C_SYNC_TARGET (P_RS_DATA_REPLY) |
| 1677 | */ |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 1678 | int drbd_send_block(struct drbd_conf *mdev, enum drbd_packet cmd, |
Andreas Gruenbacher | db830c4 | 2011-02-04 15:57:48 +0100 | [diff] [blame] | 1679 | struct drbd_peer_request *peer_req) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1680 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1681 | struct drbd_socket *sock; |
| 1682 | struct p_data *p; |
Andreas Gruenbacher | 7b57b89d | 2011-03-16 11:35:20 +0100 | [diff] [blame] | 1683 | int err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1684 | int dgs; |
| 1685 | |
Philipp Reisner | 46e1ce4 | 2011-05-16 12:57:15 +0200 | [diff] [blame] | 1686 | sock = &mdev->tconn->data; |
| 1687 | p = drbd_prepare_command(mdev, sock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1688 | |
Andreas Gruenbacher | 7d4c782 | 2011-07-17 23:06:12 +0200 | [diff] [blame] | 1689 | dgs = mdev->tconn->integrity_tfm ? crypto_hash_digestsize(mdev->tconn->integrity_tfm) : 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1690 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1691 | if (!p) |
| 1692 | return -EIO; |
| 1693 | p->sector = cpu_to_be64(peer_req->i.sector); |
| 1694 | p->block_id = peer_req->block_id; |
| 1695 | p->seq_num = 0; /* unused */ |
Lars Ellenberg | b17f33c | 2012-02-08 15:32:51 +0100 | [diff] [blame] | 1696 | p->dp_flags = 0; |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1697 | if (dgs) |
Andreas Gruenbacher | 8d412fc | 2011-04-27 20:59:18 +0200 | [diff] [blame] | 1698 | drbd_csum_ee(mdev, mdev->tconn->integrity_tfm, peer_req, p + 1); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1699 | err = __send_command(mdev->tconn, mdev->vnr, sock, cmd, sizeof(*p) + dgs, NULL, peer_req->i.size); |
Andreas Gruenbacher | 7b57b89d | 2011-03-16 11:35:20 +0100 | [diff] [blame] | 1700 | if (!err) |
| 1701 | err = _drbd_send_zc_ee(mdev, peer_req); |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1702 | mutex_unlock(&sock->mutex); /* locked by drbd_prepare_command() */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1703 | |
Andreas Gruenbacher | 7b57b89d | 2011-03-16 11:35:20 +0100 | [diff] [blame] | 1704 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1705 | } |
| 1706 | |
Andreas Gruenbacher | 8f7bed7 | 2010-12-19 23:53:14 +0100 | [diff] [blame] | 1707 | int drbd_send_out_of_sync(struct drbd_conf *mdev, struct drbd_request *req) |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1708 | { |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1709 | struct drbd_socket *sock; |
| 1710 | struct p_block_desc *p; |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1711 | |
Andreas Gruenbacher | 9f5bdc3 | 2011-03-28 14:23:08 +0200 | [diff] [blame] | 1712 | sock = &mdev->tconn->data; |
| 1713 | p = drbd_prepare_command(mdev, sock); |
| 1714 | if (!p) |
| 1715 | return -EIO; |
| 1716 | p->sector = cpu_to_be64(req->i.sector); |
| 1717 | p->blksize = cpu_to_be32(req->i.size); |
| 1718 | return drbd_send_command(mdev, sock, P_OUT_OF_SYNC, sizeof(*p), NULL, 0); |
Philipp Reisner | 73a01a1 | 2010-10-27 14:33:00 +0200 | [diff] [blame] | 1719 | } |
| 1720 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1721 | /* |
| 1722 | drbd_send distinguishes two cases: |
| 1723 | |
| 1724 | Packets sent via the data socket "sock" |
| 1725 | and packets sent via the meta data socket "msock" |
| 1726 | |
| 1727 | sock msock |
| 1728 | -----------------+-------------------------+------------------------------ |
| 1729 | timeout conf.timeout / 2 conf.timeout / 2 |
| 1730 | timeout action send a ping via msock Abort communication |
| 1731 | and close all sockets |
| 1732 | */ |
| 1733 | |
| 1734 | /* |
| 1735 | * you must have down()ed the appropriate [m]sock_mutex elsewhere! |
| 1736 | */ |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1737 | int drbd_send(struct drbd_tconn *tconn, struct socket *sock, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1738 | void *buf, size_t size, unsigned msg_flags) |
| 1739 | { |
| 1740 | struct kvec iov; |
| 1741 | struct msghdr msg; |
| 1742 | int rv, sent = 0; |
| 1743 | |
| 1744 | if (!sock) |
Andreas Gruenbacher | c0d42c8 | 2010-12-09 23:52:22 +0100 | [diff] [blame] | 1745 | return -EBADR; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1746 | |
| 1747 | /* THINK if (signal_pending) return ... ? */ |
| 1748 | |
| 1749 | iov.iov_base = buf; |
| 1750 | iov.iov_len = size; |
| 1751 | |
| 1752 | msg.msg_name = NULL; |
| 1753 | msg.msg_namelen = 0; |
| 1754 | msg.msg_control = NULL; |
| 1755 | msg.msg_controllen = 0; |
| 1756 | msg.msg_flags = msg_flags | MSG_NOSIGNAL; |
| 1757 | |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1758 | if (sock == tconn->data.socket) { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 1759 | rcu_read_lock(); |
| 1760 | tconn->ko_count = rcu_dereference(tconn->net_conf)->ko_count; |
| 1761 | rcu_read_unlock(); |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1762 | drbd_update_congested(tconn); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1763 | } |
| 1764 | do { |
| 1765 | /* STRANGE |
| 1766 | * tcp_sendmsg does _not_ use its size parameter at all ? |
| 1767 | * |
| 1768 | * -EAGAIN on timeout, -EINTR on signal. |
| 1769 | */ |
| 1770 | /* THINK |
| 1771 | * do we need to block DRBD_SIG if sock == &meta.socket ?? |
| 1772 | * otherwise wake_asender() might interrupt some send_*Ack ! |
| 1773 | */ |
| 1774 | rv = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 1775 | if (rv == -EAGAIN) { |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1776 | if (we_should_drop_the_connection(tconn, sock)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1777 | break; |
| 1778 | else |
| 1779 | continue; |
| 1780 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1781 | if (rv == -EINTR) { |
| 1782 | flush_signals(current); |
| 1783 | rv = 0; |
| 1784 | } |
| 1785 | if (rv < 0) |
| 1786 | break; |
| 1787 | sent += rv; |
| 1788 | iov.iov_base += rv; |
| 1789 | iov.iov_len -= rv; |
| 1790 | } while (sent < size); |
| 1791 | |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1792 | if (sock == tconn->data.socket) |
| 1793 | clear_bit(NET_CONGESTED, &tconn->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1794 | |
| 1795 | if (rv <= 0) { |
| 1796 | if (rv != -EAGAIN) { |
Philipp Reisner | bedbd2a | 2011-02-07 15:08:48 +0100 | [diff] [blame] | 1797 | conn_err(tconn, "%s_sendmsg returned %d\n", |
| 1798 | sock == tconn->meta.socket ? "msock" : "sock", |
| 1799 | rv); |
Philipp Reisner | bbeb641 | 2011-02-10 13:45:46 +0100 | [diff] [blame] | 1800 | conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1801 | } else |
Philipp Reisner | bbeb641 | 2011-02-10 13:45:46 +0100 | [diff] [blame] | 1802 | conn_request_state(tconn, NS(conn, C_TIMEOUT), CS_HARD); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1803 | } |
| 1804 | |
| 1805 | return sent; |
| 1806 | } |
| 1807 | |
Andreas Gruenbacher | fb708e4 | 2010-12-15 17:04:36 +0100 | [diff] [blame] | 1808 | /** |
| 1809 | * drbd_send_all - Send an entire buffer |
| 1810 | * |
| 1811 | * Returns 0 upon success and a negative error value otherwise. |
| 1812 | */ |
| 1813 | int drbd_send_all(struct drbd_tconn *tconn, struct socket *sock, void *buffer, |
| 1814 | size_t size, unsigned msg_flags) |
| 1815 | { |
| 1816 | int err; |
| 1817 | |
| 1818 | err = drbd_send(tconn, sock, buffer, size, msg_flags); |
| 1819 | if (err < 0) |
| 1820 | return err; |
| 1821 | if (err != size) |
| 1822 | return -EIO; |
| 1823 | return 0; |
| 1824 | } |
| 1825 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1826 | static int drbd_open(struct block_device *bdev, fmode_t mode) |
| 1827 | { |
| 1828 | struct drbd_conf *mdev = bdev->bd_disk->private_data; |
| 1829 | unsigned long flags; |
| 1830 | int rv = 0; |
| 1831 | |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 1832 | mutex_lock(&drbd_main_mutex); |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 1833 | spin_lock_irqsave(&mdev->tconn->req_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1834 | /* to have a stable mdev->state.role |
| 1835 | * and no race with updating open_cnt */ |
| 1836 | |
| 1837 | if (mdev->state.role != R_PRIMARY) { |
| 1838 | if (mode & FMODE_WRITE) |
| 1839 | rv = -EROFS; |
| 1840 | else if (!allow_oos) |
| 1841 | rv = -EMEDIUMTYPE; |
| 1842 | } |
| 1843 | |
| 1844 | if (!rv) |
| 1845 | mdev->open_cnt++; |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 1846 | spin_unlock_irqrestore(&mdev->tconn->req_lock, flags); |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 1847 | mutex_unlock(&drbd_main_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1848 | |
| 1849 | return rv; |
| 1850 | } |
| 1851 | |
| 1852 | static int drbd_release(struct gendisk *gd, fmode_t mode) |
| 1853 | { |
| 1854 | struct drbd_conf *mdev = gd->private_data; |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 1855 | mutex_lock(&drbd_main_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1856 | mdev->open_cnt--; |
Arnd Bergmann | 2a48fc0 | 2010-06-02 14:28:52 +0200 | [diff] [blame] | 1857 | mutex_unlock(&drbd_main_mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1858 | return 0; |
| 1859 | } |
| 1860 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1861 | static void drbd_set_defaults(struct drbd_conf *mdev) |
| 1862 | { |
Lars Ellenberg | f399002 | 2011-03-23 14:31:09 +0100 | [diff] [blame] | 1863 | /* Beware! The actual layout differs |
| 1864 | * between big endian and little endian */ |
Philipp Reisner | da9fbc2 | 2011-03-29 10:52:01 +0200 | [diff] [blame] | 1865 | mdev->state = (union drbd_dev_state) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1866 | { .role = R_SECONDARY, |
| 1867 | .peer = R_UNKNOWN, |
| 1868 | .conn = C_STANDALONE, |
| 1869 | .disk = D_DISKLESS, |
| 1870 | .pdsk = D_UNKNOWN, |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1871 | } }; |
| 1872 | } |
| 1873 | |
| 1874 | void drbd_init_set_defaults(struct drbd_conf *mdev) |
| 1875 | { |
| 1876 | /* the memset(,0,) did most of this. |
| 1877 | * note: only assignments, no allocation in here */ |
| 1878 | |
| 1879 | drbd_set_defaults(mdev); |
| 1880 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1881 | atomic_set(&mdev->ap_bio_cnt, 0); |
| 1882 | atomic_set(&mdev->ap_pending_cnt, 0); |
| 1883 | atomic_set(&mdev->rs_pending_cnt, 0); |
| 1884 | atomic_set(&mdev->unacked_cnt, 0); |
| 1885 | atomic_set(&mdev->local_cnt, 0); |
Lars Ellenberg | 435f074 | 2010-09-06 12:30:25 +0200 | [diff] [blame] | 1886 | atomic_set(&mdev->pp_in_use_by_net, 0); |
Philipp Reisner | 778f271 | 2010-07-06 11:14:00 +0200 | [diff] [blame] | 1887 | atomic_set(&mdev->rs_sect_in, 0); |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 1888 | atomic_set(&mdev->rs_sect_ev, 0); |
Philipp Reisner | 759fbdf | 2010-10-26 16:02:27 +0200 | [diff] [blame] | 1889 | atomic_set(&mdev->ap_in_flight, 0); |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 1890 | atomic_set(&mdev->md_io_in_use, 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1891 | |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 1892 | mutex_init(&mdev->own_state_mutex); |
| 1893 | mdev->state_mutex = &mdev->own_state_mutex; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1894 | |
| 1895 | spin_lock_init(&mdev->al_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1896 | spin_lock_init(&mdev->peer_seq_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1897 | |
| 1898 | INIT_LIST_HEAD(&mdev->active_ee); |
| 1899 | INIT_LIST_HEAD(&mdev->sync_ee); |
| 1900 | INIT_LIST_HEAD(&mdev->done_ee); |
| 1901 | INIT_LIST_HEAD(&mdev->read_ee); |
| 1902 | INIT_LIST_HEAD(&mdev->net_ee); |
| 1903 | INIT_LIST_HEAD(&mdev->resync_reads); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1904 | INIT_LIST_HEAD(&mdev->resync_work.list); |
| 1905 | INIT_LIST_HEAD(&mdev->unplug_work.list); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1906 | INIT_LIST_HEAD(&mdev->go_diskless.list); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1907 | INIT_LIST_HEAD(&mdev->md_sync_work.list); |
Philipp Reisner | c4752ef | 2010-10-27 17:32:36 +0200 | [diff] [blame] | 1908 | INIT_LIST_HEAD(&mdev->start_resync_work.list); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1909 | INIT_LIST_HEAD(&mdev->bm_io_work.w.list); |
Philipp Reisner | 0ced55a | 2010-04-30 15:26:20 +0200 | [diff] [blame] | 1910 | |
Philipp Reisner | 794abb7 | 2010-12-27 11:51:23 +0100 | [diff] [blame] | 1911 | mdev->resync_work.cb = w_resync_timer; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1912 | mdev->unplug_work.cb = w_send_write_hint; |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1913 | mdev->go_diskless.cb = w_go_diskless; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1914 | mdev->md_sync_work.cb = w_md_sync; |
| 1915 | mdev->bm_io_work.w.cb = w_bitmap_io; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1916 | mdev->start_resync_work.cb = w_start_resync; |
Philipp Reisner | a21e929 | 2011-02-08 15:08:49 +0100 | [diff] [blame] | 1917 | |
| 1918 | mdev->resync_work.mdev = mdev; |
| 1919 | mdev->unplug_work.mdev = mdev; |
| 1920 | mdev->go_diskless.mdev = mdev; |
| 1921 | mdev->md_sync_work.mdev = mdev; |
| 1922 | mdev->bm_io_work.w.mdev = mdev; |
| 1923 | mdev->start_resync_work.mdev = mdev; |
| 1924 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1925 | init_timer(&mdev->resync_timer); |
| 1926 | init_timer(&mdev->md_sync_timer); |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1927 | init_timer(&mdev->start_resync_timer); |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 1928 | init_timer(&mdev->request_timer); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1929 | mdev->resync_timer.function = resync_timer_fn; |
| 1930 | mdev->resync_timer.data = (unsigned long) mdev; |
| 1931 | mdev->md_sync_timer.function = md_sync_timer_fn; |
| 1932 | mdev->md_sync_timer.data = (unsigned long) mdev; |
Philipp Reisner | 370a43e | 2011-01-14 16:03:11 +0100 | [diff] [blame] | 1933 | mdev->start_resync_timer.function = start_resync_timer_fn; |
| 1934 | mdev->start_resync_timer.data = (unsigned long) mdev; |
Philipp Reisner | 7fde2be | 2011-03-01 11:08:28 +0100 | [diff] [blame] | 1935 | mdev->request_timer.function = request_timer_fn; |
| 1936 | mdev->request_timer.data = (unsigned long) mdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1937 | |
| 1938 | init_waitqueue_head(&mdev->misc_wait); |
| 1939 | init_waitqueue_head(&mdev->state_wait); |
| 1940 | init_waitqueue_head(&mdev->ee_wait); |
| 1941 | init_waitqueue_head(&mdev->al_wait); |
| 1942 | init_waitqueue_head(&mdev->seq_wait); |
| 1943 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1944 | mdev->resync_wenr = LC_FREE; |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 1945 | mdev->peer_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
| 1946 | mdev->local_max_bio_size = DRBD_MAX_BIO_SIZE_SAFE; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1947 | } |
| 1948 | |
| 1949 | void drbd_mdev_cleanup(struct drbd_conf *mdev) |
| 1950 | { |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1951 | int i; |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 1952 | if (mdev->tconn->receiver.t_state != NONE) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1953 | dev_err(DEV, "ASSERT FAILED: receiver t_state == %d expected 0.\n", |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 1954 | mdev->tconn->receiver.t_state); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1955 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1956 | mdev->al_writ_cnt = |
| 1957 | mdev->bm_writ_cnt = |
| 1958 | mdev->read_cnt = |
| 1959 | mdev->recv_cnt = |
| 1960 | mdev->send_cnt = |
| 1961 | mdev->writ_cnt = |
| 1962 | mdev->p_size = |
| 1963 | mdev->rs_start = |
| 1964 | mdev->rs_total = |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1965 | mdev->rs_failed = 0; |
| 1966 | mdev->rs_last_events = 0; |
Lars Ellenberg | 0f0601f | 2010-08-11 23:40:24 +0200 | [diff] [blame] | 1967 | mdev->rs_last_sect_ev = 0; |
Lars Ellenberg | 1d7734a | 2010-08-11 21:21:50 +0200 | [diff] [blame] | 1968 | for (i = 0; i < DRBD_SYNC_MARKS; i++) { |
| 1969 | mdev->rs_mark_left[i] = 0; |
| 1970 | mdev->rs_mark_time[i] = 0; |
| 1971 | } |
Philipp Reisner | 89e58e7 | 2011-01-19 13:12:45 +0100 | [diff] [blame] | 1972 | D_ASSERT(mdev->tconn->net_conf == NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1973 | |
| 1974 | drbd_set_my_capacity(mdev, 0); |
| 1975 | if (mdev->bitmap) { |
| 1976 | /* maybe never allocated. */ |
Philipp Reisner | 02d9a94 | 2010-03-24 16:23:03 +0100 | [diff] [blame] | 1977 | drbd_bm_resize(mdev, 0, 1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1978 | drbd_bm_cleanup(mdev); |
| 1979 | } |
| 1980 | |
Philipp Reisner | 1d04122 | 2011-04-22 15:20:23 +0200 | [diff] [blame] | 1981 | drbd_free_bc(mdev->ldev); |
| 1982 | mdev->ldev = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1983 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1984 | clear_bit(AL_SUSPENDED, &mdev->flags); |
| 1985 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1986 | D_ASSERT(list_empty(&mdev->active_ee)); |
| 1987 | D_ASSERT(list_empty(&mdev->sync_ee)); |
| 1988 | D_ASSERT(list_empty(&mdev->done_ee)); |
| 1989 | D_ASSERT(list_empty(&mdev->read_ee)); |
| 1990 | D_ASSERT(list_empty(&mdev->net_ee)); |
| 1991 | D_ASSERT(list_empty(&mdev->resync_reads)); |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 1992 | D_ASSERT(list_empty(&mdev->tconn->sender_work.q)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1993 | D_ASSERT(list_empty(&mdev->resync_work.list)); |
| 1994 | D_ASSERT(list_empty(&mdev->unplug_work.list)); |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 1995 | D_ASSERT(list_empty(&mdev->go_diskless.list)); |
Lars Ellenberg | 2265b47 | 2010-12-16 15:41:26 +0100 | [diff] [blame] | 1996 | |
| 1997 | drbd_set_defaults(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 1998 | } |
| 1999 | |
| 2000 | |
| 2001 | static void drbd_destroy_mempools(void) |
| 2002 | { |
| 2003 | struct page *page; |
| 2004 | |
| 2005 | while (drbd_pp_pool) { |
| 2006 | page = drbd_pp_pool; |
| 2007 | drbd_pp_pool = (struct page *)page_private(page); |
| 2008 | __free_page(page); |
| 2009 | drbd_pp_vacant--; |
| 2010 | } |
| 2011 | |
| 2012 | /* D_ASSERT(atomic_read(&drbd_pp_vacant)==0); */ |
| 2013 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 2014 | if (drbd_md_io_bio_set) |
| 2015 | bioset_free(drbd_md_io_bio_set); |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 2016 | if (drbd_md_io_page_pool) |
| 2017 | mempool_destroy(drbd_md_io_page_pool); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2018 | if (drbd_ee_mempool) |
| 2019 | mempool_destroy(drbd_ee_mempool); |
| 2020 | if (drbd_request_mempool) |
| 2021 | mempool_destroy(drbd_request_mempool); |
| 2022 | if (drbd_ee_cache) |
| 2023 | kmem_cache_destroy(drbd_ee_cache); |
| 2024 | if (drbd_request_cache) |
| 2025 | kmem_cache_destroy(drbd_request_cache); |
| 2026 | if (drbd_bm_ext_cache) |
| 2027 | kmem_cache_destroy(drbd_bm_ext_cache); |
| 2028 | if (drbd_al_ext_cache) |
| 2029 | kmem_cache_destroy(drbd_al_ext_cache); |
| 2030 | |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 2031 | drbd_md_io_bio_set = NULL; |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 2032 | drbd_md_io_page_pool = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2033 | drbd_ee_mempool = NULL; |
| 2034 | drbd_request_mempool = NULL; |
| 2035 | drbd_ee_cache = NULL; |
| 2036 | drbd_request_cache = NULL; |
| 2037 | drbd_bm_ext_cache = NULL; |
| 2038 | drbd_al_ext_cache = NULL; |
| 2039 | |
| 2040 | return; |
| 2041 | } |
| 2042 | |
| 2043 | static int drbd_create_mempools(void) |
| 2044 | { |
| 2045 | struct page *page; |
Lars Ellenberg | 1816a2b | 2010-11-11 15:19:07 +0100 | [diff] [blame] | 2046 | const int number = (DRBD_MAX_BIO_SIZE/PAGE_SIZE) * minor_count; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2047 | int i; |
| 2048 | |
| 2049 | /* prepare our caches and mempools */ |
| 2050 | drbd_request_mempool = NULL; |
| 2051 | drbd_ee_cache = NULL; |
| 2052 | drbd_request_cache = NULL; |
| 2053 | drbd_bm_ext_cache = NULL; |
| 2054 | drbd_al_ext_cache = NULL; |
| 2055 | drbd_pp_pool = NULL; |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 2056 | drbd_md_io_page_pool = NULL; |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 2057 | drbd_md_io_bio_set = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2058 | |
| 2059 | /* caches */ |
| 2060 | drbd_request_cache = kmem_cache_create( |
| 2061 | "drbd_req", sizeof(struct drbd_request), 0, 0, NULL); |
| 2062 | if (drbd_request_cache == NULL) |
| 2063 | goto Enomem; |
| 2064 | |
| 2065 | drbd_ee_cache = kmem_cache_create( |
Andreas Gruenbacher | f6ffca9 | 2011-02-04 15:30:34 +0100 | [diff] [blame] | 2066 | "drbd_ee", sizeof(struct drbd_peer_request), 0, 0, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2067 | if (drbd_ee_cache == NULL) |
| 2068 | goto Enomem; |
| 2069 | |
| 2070 | drbd_bm_ext_cache = kmem_cache_create( |
| 2071 | "drbd_bm", sizeof(struct bm_extent), 0, 0, NULL); |
| 2072 | if (drbd_bm_ext_cache == NULL) |
| 2073 | goto Enomem; |
| 2074 | |
| 2075 | drbd_al_ext_cache = kmem_cache_create( |
| 2076 | "drbd_al", sizeof(struct lc_element), 0, 0, NULL); |
| 2077 | if (drbd_al_ext_cache == NULL) |
| 2078 | goto Enomem; |
| 2079 | |
| 2080 | /* mempools */ |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 2081 | drbd_md_io_bio_set = bioset_create(DRBD_MIN_POOL_PAGES, 0); |
| 2082 | if (drbd_md_io_bio_set == NULL) |
| 2083 | goto Enomem; |
Lars Ellenberg | 9476f39 | 2011-02-23 17:02:01 +0100 | [diff] [blame] | 2084 | |
Lars Ellenberg | 4281808 | 2011-02-23 12:39:46 +0100 | [diff] [blame] | 2085 | drbd_md_io_page_pool = mempool_create_page_pool(DRBD_MIN_POOL_PAGES, 0); |
| 2086 | if (drbd_md_io_page_pool == NULL) |
| 2087 | goto Enomem; |
| 2088 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2089 | drbd_request_mempool = mempool_create(number, |
| 2090 | mempool_alloc_slab, mempool_free_slab, drbd_request_cache); |
| 2091 | if (drbd_request_mempool == NULL) |
| 2092 | goto Enomem; |
| 2093 | |
| 2094 | drbd_ee_mempool = mempool_create(number, |
| 2095 | mempool_alloc_slab, mempool_free_slab, drbd_ee_cache); |
Nicolas Kaiser | 2027ae1 | 2010-10-28 06:15:26 -0600 | [diff] [blame] | 2096 | if (drbd_ee_mempool == NULL) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2097 | goto Enomem; |
| 2098 | |
| 2099 | /* drbd's page pool */ |
| 2100 | spin_lock_init(&drbd_pp_lock); |
| 2101 | |
| 2102 | for (i = 0; i < number; i++) { |
| 2103 | page = alloc_page(GFP_HIGHUSER); |
| 2104 | if (!page) |
| 2105 | goto Enomem; |
| 2106 | set_page_private(page, (unsigned long)drbd_pp_pool); |
| 2107 | drbd_pp_pool = page; |
| 2108 | } |
| 2109 | drbd_pp_vacant = number; |
| 2110 | |
| 2111 | return 0; |
| 2112 | |
| 2113 | Enomem: |
| 2114 | drbd_destroy_mempools(); /* in case we allocated some */ |
| 2115 | return -ENOMEM; |
| 2116 | } |
| 2117 | |
| 2118 | static int drbd_notify_sys(struct notifier_block *this, unsigned long code, |
| 2119 | void *unused) |
| 2120 | { |
| 2121 | /* just so we have it. you never know what interesting things we |
| 2122 | * might want to do here some day... |
| 2123 | */ |
| 2124 | |
| 2125 | return NOTIFY_DONE; |
| 2126 | } |
| 2127 | |
| 2128 | static struct notifier_block drbd_notifier = { |
| 2129 | .notifier_call = drbd_notify_sys, |
| 2130 | }; |
| 2131 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2132 | static void drbd_release_all_peer_reqs(struct drbd_conf *mdev) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2133 | { |
| 2134 | int rr; |
| 2135 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2136 | rr = drbd_free_peer_reqs(mdev, &mdev->active_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2137 | if (rr) |
| 2138 | dev_err(DEV, "%d EEs in active list found!\n", rr); |
| 2139 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2140 | rr = drbd_free_peer_reqs(mdev, &mdev->sync_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2141 | if (rr) |
| 2142 | dev_err(DEV, "%d EEs in sync list found!\n", rr); |
| 2143 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2144 | rr = drbd_free_peer_reqs(mdev, &mdev->read_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2145 | if (rr) |
| 2146 | dev_err(DEV, "%d EEs in read list found!\n", rr); |
| 2147 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2148 | rr = drbd_free_peer_reqs(mdev, &mdev->done_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2149 | if (rr) |
| 2150 | dev_err(DEV, "%d EEs in done list found!\n", rr); |
| 2151 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2152 | rr = drbd_free_peer_reqs(mdev, &mdev->net_ee); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2153 | if (rr) |
| 2154 | dev_err(DEV, "%d EEs in net list found!\n", rr); |
| 2155 | } |
| 2156 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2157 | /* caution. no locking. */ |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2158 | void drbd_minor_destroy(struct kref *kref) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2159 | { |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2160 | struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref); |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2161 | struct drbd_tconn *tconn = mdev->tconn; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2162 | |
Philipp Reisner | dfa8bed | 2011-06-29 14:06:08 +0200 | [diff] [blame] | 2163 | del_timer_sync(&mdev->request_timer); |
| 2164 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2165 | /* paranoia asserts */ |
Andreas Gruenbacher | 70dc65e | 2010-12-21 14:46:57 +0100 | [diff] [blame] | 2166 | D_ASSERT(mdev->open_cnt == 0); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2167 | /* end paranoia asserts */ |
| 2168 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2169 | /* cleanup stuff that may have been allocated during |
| 2170 | * device (re-)configuration or state changes */ |
| 2171 | |
| 2172 | if (mdev->this_bdev) |
| 2173 | bdput(mdev->this_bdev); |
| 2174 | |
Philipp Reisner | 1d04122 | 2011-04-22 15:20:23 +0200 | [diff] [blame] | 2175 | drbd_free_bc(mdev->ldev); |
| 2176 | mdev->ldev = NULL; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2177 | |
Andreas Gruenbacher | 7721f56 | 2011-04-06 17:14:02 +0200 | [diff] [blame] | 2178 | drbd_release_all_peer_reqs(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2179 | |
| 2180 | lc_destroy(mdev->act_log); |
| 2181 | lc_destroy(mdev->resync); |
| 2182 | |
| 2183 | kfree(mdev->p_uuid); |
| 2184 | /* mdev->p_uuid = NULL; */ |
| 2185 | |
Philipp Reisner | cd1d995 | 2011-04-11 21:24:24 -0700 | [diff] [blame] | 2186 | if (mdev->bitmap) /* should no longer be there. */ |
| 2187 | drbd_bm_cleanup(mdev); |
| 2188 | __free_page(mdev->md_io_page); |
| 2189 | put_disk(mdev->vdisk); |
| 2190 | blk_cleanup_queue(mdev->rq_queue); |
Philipp Reisner | 9958c85 | 2011-05-03 16:19:31 +0200 | [diff] [blame] | 2191 | kfree(mdev->rs_plan_s); |
Philipp Reisner | cd1d995 | 2011-04-11 21:24:24 -0700 | [diff] [blame] | 2192 | kfree(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2193 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2194 | kref_put(&tconn->kref, &conn_destroy); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2195 | } |
| 2196 | |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2197 | /* One global retry thread, if we need to push back some bio and have it |
| 2198 | * reinserted through our make request function. |
| 2199 | */ |
| 2200 | static struct retry_worker { |
| 2201 | struct workqueue_struct *wq; |
| 2202 | struct work_struct worker; |
| 2203 | |
| 2204 | spinlock_t lock; |
| 2205 | struct list_head writes; |
| 2206 | } retry; |
| 2207 | |
| 2208 | static void do_retry(struct work_struct *ws) |
| 2209 | { |
| 2210 | struct retry_worker *retry = container_of(ws, struct retry_worker, worker); |
| 2211 | LIST_HEAD(writes); |
| 2212 | struct drbd_request *req, *tmp; |
| 2213 | |
| 2214 | spin_lock_irq(&retry->lock); |
| 2215 | list_splice_init(&retry->writes, &writes); |
| 2216 | spin_unlock_irq(&retry->lock); |
| 2217 | |
| 2218 | list_for_each_entry_safe(req, tmp, &writes, tl_requests) { |
| 2219 | struct drbd_conf *mdev = req->w.mdev; |
| 2220 | struct bio *bio = req->master_bio; |
| 2221 | unsigned long start_time = req->start_time; |
Lars Ellenberg | 9a278a7 | 2012-07-24 10:12:36 +0200 | [diff] [blame] | 2222 | bool expected; |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2223 | |
Lars Ellenberg | 9a278a7 | 2012-07-24 10:12:36 +0200 | [diff] [blame] | 2224 | expected = |
| 2225 | expect(atomic_read(&req->completion_ref) == 0) && |
| 2226 | expect(req->rq_state & RQ_POSTPONED) && |
| 2227 | expect((req->rq_state & RQ_LOCAL_PENDING) == 0 || |
| 2228 | (req->rq_state & RQ_LOCAL_ABORTED) != 0); |
| 2229 | |
| 2230 | if (!expected) |
| 2231 | dev_err(DEV, "req=%p completion_ref=%d rq_state=%x\n", |
| 2232 | req, atomic_read(&req->completion_ref), |
| 2233 | req->rq_state); |
| 2234 | |
| 2235 | /* We still need to put one kref associated with the |
| 2236 | * "completion_ref" going zero in the code path that queued it |
| 2237 | * here. The request object may still be referenced by a |
| 2238 | * frozen local req->private_bio, in case we force-detached. |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2239 | */ |
Lars Ellenberg | 9a278a7 | 2012-07-24 10:12:36 +0200 | [diff] [blame] | 2240 | kref_put(&req->kref, drbd_req_destroy); |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2241 | |
| 2242 | /* A single suspended or otherwise blocking device may stall |
| 2243 | * all others as well. Fortunately, this code path is to |
| 2244 | * recover from a situation that "should not happen": |
| 2245 | * concurrent writes in multi-primary setup. |
| 2246 | * In a "normal" lifecycle, this workqueue is supposed to be |
| 2247 | * destroyed without ever doing anything. |
| 2248 | * If it turns out to be an issue anyways, we can do per |
| 2249 | * resource (replication group) or per device (minor) retry |
| 2250 | * workqueues instead. |
| 2251 | */ |
| 2252 | |
| 2253 | /* We are not just doing generic_make_request(), |
| 2254 | * as we want to keep the start_time information. */ |
Lars Ellenberg | 5df69ec | 2012-01-24 16:49:58 +0100 | [diff] [blame] | 2255 | inc_ap_bio(mdev); |
| 2256 | __drbd_make_request(mdev, bio, start_time); |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2257 | } |
| 2258 | } |
| 2259 | |
Lars Ellenberg | 9d05e7c | 2012-07-17 10:05:04 +0200 | [diff] [blame] | 2260 | void drbd_restart_request(struct drbd_request *req) |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2261 | { |
| 2262 | unsigned long flags; |
| 2263 | spin_lock_irqsave(&retry.lock, flags); |
| 2264 | list_move_tail(&req->tl_requests, &retry.writes); |
| 2265 | spin_unlock_irqrestore(&retry.lock, flags); |
| 2266 | |
| 2267 | /* Drop the extra reference that would otherwise |
| 2268 | * have been dropped by complete_master_bio. |
| 2269 | * do_retry() needs to grab a new one. */ |
| 2270 | dec_ap_bio(req->w.mdev); |
| 2271 | |
| 2272 | queue_work(retry.wq, &retry.worker); |
| 2273 | } |
| 2274 | |
| 2275 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2276 | static void drbd_cleanup(void) |
| 2277 | { |
| 2278 | unsigned int i; |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2279 | struct drbd_conf *mdev; |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2280 | struct drbd_tconn *tconn, *tmp; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2281 | |
| 2282 | unregister_reboot_notifier(&drbd_notifier); |
| 2283 | |
Lars Ellenberg | 17a93f3 | 2010-11-24 10:37:35 +0100 | [diff] [blame] | 2284 | /* first remove proc, |
| 2285 | * drbdsetup uses it's presence to detect |
| 2286 | * whether DRBD is loaded. |
| 2287 | * If we would get stuck in proc removal, |
| 2288 | * but have netlink already deregistered, |
| 2289 | * some drbdsetup commands may wait forever |
| 2290 | * for an answer. |
| 2291 | */ |
| 2292 | if (drbd_proc) |
| 2293 | remove_proc_entry("drbd", NULL); |
| 2294 | |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2295 | if (retry.wq) |
| 2296 | destroy_workqueue(retry.wq); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2297 | |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2298 | drbd_genl_unregister(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2299 | |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2300 | idr_for_each_entry(&minors, mdev, i) { |
| 2301 | idr_remove(&minors, mdev_to_minor(mdev)); |
| 2302 | idr_remove(&mdev->tconn->volumes, mdev->vnr); |
| 2303 | del_gendisk(mdev->vdisk); |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2304 | /* synchronize_rcu(); No other threads running at this point */ |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2305 | kref_put(&mdev->kref, &drbd_minor_destroy); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2306 | } |
| 2307 | |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2308 | /* not _rcu since, no other updater anymore. Genl already unregistered */ |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2309 | list_for_each_entry_safe(tconn, tmp, &drbd_tconns, all_tconn) { |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2310 | list_del(&tconn->all_tconn); /* not _rcu no proc, not other threads */ |
| 2311 | /* synchronize_rcu(); */ |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2312 | kref_put(&tconn->kref, &conn_destroy); |
| 2313 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2314 | |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2315 | drbd_destroy_mempools(); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2316 | unregister_blkdev(DRBD_MAJOR, "drbd"); |
| 2317 | |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2318 | idr_destroy(&minors); |
| 2319 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2320 | printk(KERN_INFO "drbd: module cleanup done.\n"); |
| 2321 | } |
| 2322 | |
| 2323 | /** |
Artem Bityutskiy | d97482e | 2012-07-25 18:12:12 +0300 | [diff] [blame] | 2324 | * drbd_congested() - Callback for the flusher thread |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2325 | * @congested_data: User data |
Artem Bityutskiy | d97482e | 2012-07-25 18:12:12 +0300 | [diff] [blame] | 2326 | * @bdi_bits: Bits the BDI flusher thread is currently interested in |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2327 | * |
| 2328 | * Returns 1<<BDI_async_congested and/or 1<<BDI_sync_congested if we are congested. |
| 2329 | */ |
| 2330 | static int drbd_congested(void *congested_data, int bdi_bits) |
| 2331 | { |
| 2332 | struct drbd_conf *mdev = congested_data; |
| 2333 | struct request_queue *q; |
| 2334 | char reason = '-'; |
| 2335 | int r = 0; |
| 2336 | |
Andreas Gruenbacher | 1b881ef | 2010-12-13 18:03:38 +0100 | [diff] [blame] | 2337 | if (!may_inc_ap_bio(mdev)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2338 | /* DRBD has frozen IO */ |
| 2339 | r = bdi_bits; |
| 2340 | reason = 'd'; |
| 2341 | goto out; |
| 2342 | } |
| 2343 | |
Lars Ellenberg | 6f3465e | 2012-07-30 09:08:25 +0200 | [diff] [blame] | 2344 | if (test_bit(CALLBACK_PENDING, &mdev->tconn->flags)) { |
Lars Ellenberg | c2ba686 | 2012-06-14 15:14:06 +0200 | [diff] [blame] | 2345 | r |= (1 << BDI_async_congested); |
| 2346 | /* Without good local data, we would need to read from remote, |
| 2347 | * and that would need the worker thread as well, which is |
| 2348 | * currently blocked waiting for that usermode helper to |
| 2349 | * finish. |
| 2350 | */ |
| 2351 | if (!get_ldev_if_state(mdev, D_UP_TO_DATE)) |
| 2352 | r |= (1 << BDI_sync_congested); |
| 2353 | else |
| 2354 | put_ldev(mdev); |
| 2355 | r &= bdi_bits; |
| 2356 | reason = 'c'; |
| 2357 | goto out; |
| 2358 | } |
| 2359 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2360 | if (get_ldev(mdev)) { |
| 2361 | q = bdev_get_queue(mdev->ldev->backing_bdev); |
| 2362 | r = bdi_congested(&q->backing_dev_info, bdi_bits); |
| 2363 | put_ldev(mdev); |
| 2364 | if (r) |
| 2365 | reason = 'b'; |
| 2366 | } |
| 2367 | |
Philipp Reisner | 01a311a | 2011-02-07 14:30:33 +0100 | [diff] [blame] | 2368 | if (bdi_bits & (1 << BDI_async_congested) && test_bit(NET_CONGESTED, &mdev->tconn->flags)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2369 | r |= (1 << BDI_async_congested); |
| 2370 | reason = reason == 'b' ? 'a' : 'n'; |
| 2371 | } |
| 2372 | |
| 2373 | out: |
| 2374 | mdev->congestion_reason = reason; |
| 2375 | return r; |
| 2376 | } |
| 2377 | |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2378 | static void drbd_init_workqueue(struct drbd_work_queue* wq) |
| 2379 | { |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2380 | spin_lock_init(&wq->q_lock); |
| 2381 | INIT_LIST_HEAD(&wq->q); |
Lars Ellenberg | 8c0785a | 2011-10-19 11:50:57 +0200 | [diff] [blame] | 2382 | init_waitqueue_head(&wq->q_wait); |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2383 | } |
| 2384 | |
Philipp Reisner | 0ace9df | 2011-04-24 10:53:19 +0200 | [diff] [blame] | 2385 | struct drbd_tconn *conn_get_by_name(const char *name) |
Philipp Reisner | 1aba4d7 | 2011-02-21 15:38:08 +0100 | [diff] [blame] | 2386 | { |
| 2387 | struct drbd_tconn *tconn; |
| 2388 | |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2389 | if (!name || !name[0]) |
| 2390 | return NULL; |
| 2391 | |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2392 | rcu_read_lock(); |
Philipp Reisner | ec0bddb | 2011-05-04 15:47:01 +0200 | [diff] [blame] | 2393 | list_for_each_entry_rcu(tconn, &drbd_tconns, all_tconn) { |
Philipp Reisner | 0ace9df | 2011-04-24 10:53:19 +0200 | [diff] [blame] | 2394 | if (!strcmp(tconn->name, name)) { |
| 2395 | kref_get(&tconn->kref); |
Philipp Reisner | 1aba4d7 | 2011-02-21 15:38:08 +0100 | [diff] [blame] | 2396 | goto found; |
Philipp Reisner | 0ace9df | 2011-04-24 10:53:19 +0200 | [diff] [blame] | 2397 | } |
Philipp Reisner | 1aba4d7 | 2011-02-21 15:38:08 +0100 | [diff] [blame] | 2398 | } |
| 2399 | tconn = NULL; |
| 2400 | found: |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2401 | rcu_read_unlock(); |
Philipp Reisner | 1aba4d7 | 2011-02-21 15:38:08 +0100 | [diff] [blame] | 2402 | return tconn; |
| 2403 | } |
| 2404 | |
Andreas Gruenbacher | 089c075 | 2011-06-14 18:28:09 +0200 | [diff] [blame] | 2405 | struct drbd_tconn *conn_get_by_addrs(void *my_addr, int my_addr_len, |
| 2406 | void *peer_addr, int peer_addr_len) |
| 2407 | { |
| 2408 | struct drbd_tconn *tconn; |
| 2409 | |
| 2410 | rcu_read_lock(); |
| 2411 | list_for_each_entry_rcu(tconn, &drbd_tconns, all_tconn) { |
| 2412 | if (tconn->my_addr_len == my_addr_len && |
| 2413 | tconn->peer_addr_len == peer_addr_len && |
| 2414 | !memcmp(&tconn->my_addr, my_addr, my_addr_len) && |
| 2415 | !memcmp(&tconn->peer_addr, peer_addr, peer_addr_len)) { |
| 2416 | kref_get(&tconn->kref); |
| 2417 | goto found; |
| 2418 | } |
| 2419 | } |
| 2420 | tconn = NULL; |
| 2421 | found: |
| 2422 | rcu_read_unlock(); |
| 2423 | return tconn; |
| 2424 | } |
| 2425 | |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2426 | static int drbd_alloc_socket(struct drbd_socket *socket) |
| 2427 | { |
| 2428 | socket->rbuf = (void *) __get_free_page(GFP_KERNEL); |
| 2429 | if (!socket->rbuf) |
| 2430 | return -ENOMEM; |
Andreas Gruenbacher | 5a87d92 | 2011-03-24 21:17:52 +0100 | [diff] [blame] | 2431 | socket->sbuf = (void *) __get_free_page(GFP_KERNEL); |
| 2432 | if (!socket->sbuf) |
| 2433 | return -ENOMEM; |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2434 | return 0; |
| 2435 | } |
| 2436 | |
| 2437 | static void drbd_free_socket(struct drbd_socket *socket) |
| 2438 | { |
Andreas Gruenbacher | 5a87d92 | 2011-03-24 21:17:52 +0100 | [diff] [blame] | 2439 | free_page((unsigned long) socket->sbuf); |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2440 | free_page((unsigned long) socket->rbuf); |
| 2441 | } |
| 2442 | |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 2443 | void conn_free_crypto(struct drbd_tconn *tconn) |
| 2444 | { |
Philipp Reisner | 1d04122 | 2011-04-22 15:20:23 +0200 | [diff] [blame] | 2445 | drbd_free_sock(tconn); |
| 2446 | |
| 2447 | crypto_free_hash(tconn->csums_tfm); |
| 2448 | crypto_free_hash(tconn->verify_tfm); |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 2449 | crypto_free_hash(tconn->cram_hmac_tfm); |
Andreas Gruenbacher | 8d412fc | 2011-04-27 20:59:18 +0200 | [diff] [blame] | 2450 | crypto_free_hash(tconn->integrity_tfm); |
Andreas Gruenbacher | 5b614ab | 2011-04-27 21:00:12 +0200 | [diff] [blame] | 2451 | crypto_free_hash(tconn->peer_integrity_tfm); |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 2452 | kfree(tconn->int_dig_in); |
| 2453 | kfree(tconn->int_dig_vv); |
Philipp Reisner | 1d04122 | 2011-04-22 15:20:23 +0200 | [diff] [blame] | 2454 | |
| 2455 | tconn->csums_tfm = NULL; |
| 2456 | tconn->verify_tfm = NULL; |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 2457 | tconn->cram_hmac_tfm = NULL; |
Andreas Gruenbacher | 8d412fc | 2011-04-27 20:59:18 +0200 | [diff] [blame] | 2458 | tconn->integrity_tfm = NULL; |
Andreas Gruenbacher | 5b614ab | 2011-04-27 21:00:12 +0200 | [diff] [blame] | 2459 | tconn->peer_integrity_tfm = NULL; |
Philipp Reisner | 91fd4da | 2011-04-20 17:47:29 +0200 | [diff] [blame] | 2460 | tconn->int_dig_in = NULL; |
| 2461 | tconn->int_dig_vv = NULL; |
| 2462 | } |
| 2463 | |
Andreas Gruenbacher | afbbfa8 | 2011-06-16 17:58:02 +0200 | [diff] [blame] | 2464 | int set_resource_options(struct drbd_tconn *tconn, struct res_opts *res_opts) |
| 2465 | { |
| 2466 | cpumask_var_t new_cpu_mask; |
| 2467 | int err; |
| 2468 | |
| 2469 | if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) |
| 2470 | return -ENOMEM; |
| 2471 | /* |
| 2472 | retcode = ERR_NOMEM; |
| 2473 | drbd_msg_put_info("unable to allocate cpumask"); |
| 2474 | */ |
| 2475 | |
| 2476 | /* silently ignore cpu mask on UP kernel */ |
| 2477 | if (nr_cpu_ids > 1 && res_opts->cpu_mask[0] != 0) { |
| 2478 | /* FIXME: Get rid of constant 32 here */ |
Philipp Reisner | c5b005a | 2012-04-30 12:53:52 +0200 | [diff] [blame] | 2479 | err = bitmap_parse(res_opts->cpu_mask, 32, |
| 2480 | cpumask_bits(new_cpu_mask), nr_cpu_ids); |
Andreas Gruenbacher | afbbfa8 | 2011-06-16 17:58:02 +0200 | [diff] [blame] | 2481 | if (err) { |
Philipp Reisner | c5b005a | 2012-04-30 12:53:52 +0200 | [diff] [blame] | 2482 | conn_warn(tconn, "bitmap_parse() failed with %d\n", err); |
Andreas Gruenbacher | afbbfa8 | 2011-06-16 17:58:02 +0200 | [diff] [blame] | 2483 | /* retcode = ERR_CPU_MASK_PARSE; */ |
| 2484 | goto fail; |
| 2485 | } |
| 2486 | } |
| 2487 | tconn->res_opts = *res_opts; |
| 2488 | if (!cpumask_equal(tconn->cpu_mask, new_cpu_mask)) { |
| 2489 | cpumask_copy(tconn->cpu_mask, new_cpu_mask); |
| 2490 | drbd_calc_cpu_mask(tconn); |
| 2491 | tconn->receiver.reset_cpu_mask = 1; |
| 2492 | tconn->asender.reset_cpu_mask = 1; |
| 2493 | tconn->worker.reset_cpu_mask = 1; |
| 2494 | } |
| 2495 | err = 0; |
| 2496 | |
| 2497 | fail: |
| 2498 | free_cpumask_var(new_cpu_mask); |
| 2499 | return err; |
| 2500 | |
| 2501 | } |
| 2502 | |
Philipp Reisner | ec0bddb | 2011-05-04 15:47:01 +0200 | [diff] [blame] | 2503 | /* caller must be under genl_lock() */ |
Andreas Gruenbacher | afbbfa8 | 2011-06-16 17:58:02 +0200 | [diff] [blame] | 2504 | struct drbd_tconn *conn_create(const char *name, struct res_opts *res_opts) |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2505 | { |
| 2506 | struct drbd_tconn *tconn; |
| 2507 | |
| 2508 | tconn = kzalloc(sizeof(struct drbd_tconn), GFP_KERNEL); |
| 2509 | if (!tconn) |
| 2510 | return NULL; |
| 2511 | |
| 2512 | tconn->name = kstrdup(name, GFP_KERNEL); |
| 2513 | if (!tconn->name) |
| 2514 | goto fail; |
| 2515 | |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2516 | if (drbd_alloc_socket(&tconn->data)) |
| 2517 | goto fail; |
| 2518 | if (drbd_alloc_socket(&tconn->meta)) |
| 2519 | goto fail; |
| 2520 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2521 | if (!zalloc_cpumask_var(&tconn->cpu_mask, GFP_KERNEL)) |
| 2522 | goto fail; |
| 2523 | |
Andreas Gruenbacher | afbbfa8 | 2011-06-16 17:58:02 +0200 | [diff] [blame] | 2524 | if (set_resource_options(tconn, res_opts)) |
| 2525 | goto fail; |
| 2526 | |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 2527 | tconn->current_epoch = kzalloc(sizeof(struct drbd_epoch), GFP_KERNEL); |
| 2528 | if (!tconn->current_epoch) |
| 2529 | goto fail; |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 2530 | |
| 2531 | INIT_LIST_HEAD(&tconn->transfer_log); |
| 2532 | |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 2533 | INIT_LIST_HEAD(&tconn->current_epoch->list); |
| 2534 | tconn->epochs = 1; |
| 2535 | spin_lock_init(&tconn->epoch_lock); |
Philipp Reisner | 4b0007c | 2011-11-09 20:12:34 +0100 | [diff] [blame] | 2536 | tconn->write_ordering = WO_bdev_flush; |
| 2537 | |
Lars Ellenberg | b6dd1a8 | 2011-11-28 15:04:49 +0100 | [diff] [blame] | 2538 | tconn->send.seen_any_write_yet = false; |
| 2539 | tconn->send.current_epoch_nr = 0; |
| 2540 | tconn->send.current_epoch_writes = 0; |
| 2541 | |
Philipp Reisner | bbeb641 | 2011-02-10 13:45:46 +0100 | [diff] [blame] | 2542 | tconn->cstate = C_STANDALONE; |
Philipp Reisner | 8410da8 | 2011-02-11 20:11:10 +0100 | [diff] [blame] | 2543 | mutex_init(&tconn->cstate_mutex); |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2544 | spin_lock_init(&tconn->req_lock); |
Philipp Reisner | a009550 | 2011-05-03 13:14:15 +0200 | [diff] [blame] | 2545 | mutex_init(&tconn->conf_update); |
Philipp Reisner | 2a67d8b | 2011-02-09 14:10:32 +0100 | [diff] [blame] | 2546 | init_waitqueue_head(&tconn->ping_wait); |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 2547 | idr_init(&tconn->volumes); |
Philipp Reisner | b2fb6dbe | 2011-01-19 13:48:44 +0100 | [diff] [blame] | 2548 | |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 2549 | drbd_init_workqueue(&tconn->sender_work); |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2550 | mutex_init(&tconn->data.mutex); |
Philipp Reisner | 6699b65 | 2011-02-09 11:10:24 +0100 | [diff] [blame] | 2551 | mutex_init(&tconn->meta.mutex); |
| 2552 | |
Philipp Reisner | 392c880 | 2011-02-09 10:33:31 +0100 | [diff] [blame] | 2553 | drbd_thread_init(tconn, &tconn->receiver, drbdd_init, "receiver"); |
| 2554 | drbd_thread_init(tconn, &tconn->worker, drbd_worker, "worker"); |
| 2555 | drbd_thread_init(tconn, &tconn->asender, drbd_asender, "asender"); |
| 2556 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2557 | kref_init(&tconn->kref); |
Philipp Reisner | ec0bddb | 2011-05-04 15:47:01 +0200 | [diff] [blame] | 2558 | list_add_tail_rcu(&tconn->all_tconn, &drbd_tconns); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2559 | |
| 2560 | return tconn; |
| 2561 | |
| 2562 | fail: |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 2563 | kfree(tconn->current_epoch); |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2564 | free_cpumask_var(tconn->cpu_mask); |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2565 | drbd_free_socket(&tconn->meta); |
| 2566 | drbd_free_socket(&tconn->data); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2567 | kfree(tconn->name); |
| 2568 | kfree(tconn); |
| 2569 | |
| 2570 | return NULL; |
| 2571 | } |
| 2572 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2573 | void conn_destroy(struct kref *kref) |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2574 | { |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2575 | struct drbd_tconn *tconn = container_of(kref, struct drbd_tconn, kref); |
| 2576 | |
Philipp Reisner | 12038a3 | 2011-11-09 19:18:00 +0100 | [diff] [blame] | 2577 | if (atomic_read(&tconn->current_epoch->epoch_size) != 0) |
| 2578 | conn_err(tconn, "epoch_size:%d\n", atomic_read(&tconn->current_epoch->epoch_size)); |
| 2579 | kfree(tconn->current_epoch); |
| 2580 | |
Philipp Reisner | 062e879 | 2011-02-08 11:09:18 +0100 | [diff] [blame] | 2581 | idr_destroy(&tconn->volumes); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2582 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2583 | free_cpumask_var(tconn->cpu_mask); |
Andreas Gruenbacher | e6ef8a5 | 2011-03-24 18:07:54 +0100 | [diff] [blame] | 2584 | drbd_free_socket(&tconn->meta); |
| 2585 | drbd_free_socket(&tconn->data); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2586 | kfree(tconn->name); |
Philipp Reisner | b42a70a | 2011-01-27 10:55:20 +0100 | [diff] [blame] | 2587 | kfree(tconn->int_dig_in); |
| 2588 | kfree(tconn->int_dig_vv); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2589 | kfree(tconn); |
| 2590 | } |
| 2591 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2592 | enum drbd_ret_code conn_new_minor(struct drbd_tconn *tconn, unsigned int minor, int vnr) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2593 | { |
| 2594 | struct drbd_conf *mdev; |
| 2595 | struct gendisk *disk; |
| 2596 | struct request_queue *q; |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2597 | int vnr_got = vnr; |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2598 | int minor_got = minor; |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2599 | enum drbd_ret_code err = ERR_NOMEM; |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2600 | |
| 2601 | mdev = minor_to_mdev(minor); |
| 2602 | if (mdev) |
| 2603 | return ERR_MINOR_EXISTS; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2604 | |
| 2605 | /* GFP_KERNEL, we are outside of all write-out paths */ |
| 2606 | mdev = kzalloc(sizeof(struct drbd_conf), GFP_KERNEL); |
| 2607 | if (!mdev) |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2608 | return ERR_NOMEM; |
| 2609 | |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2610 | kref_get(&tconn->kref); |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2611 | mdev->tconn = tconn; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2612 | |
| 2613 | mdev->minor = minor; |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2614 | mdev->vnr = vnr; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2615 | |
| 2616 | drbd_init_set_defaults(mdev); |
| 2617 | |
| 2618 | q = blk_alloc_queue(GFP_KERNEL); |
| 2619 | if (!q) |
| 2620 | goto out_no_q; |
| 2621 | mdev->rq_queue = q; |
| 2622 | q->queuedata = mdev; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2623 | |
| 2624 | disk = alloc_disk(1); |
| 2625 | if (!disk) |
| 2626 | goto out_no_disk; |
| 2627 | mdev->vdisk = disk; |
| 2628 | |
Andreas Gruenbacher | 81e8465 | 2010-12-09 15:03:57 +0100 | [diff] [blame] | 2629 | set_disk_ro(disk, true); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2630 | |
| 2631 | disk->queue = q; |
| 2632 | disk->major = DRBD_MAJOR; |
| 2633 | disk->first_minor = minor; |
| 2634 | disk->fops = &drbd_ops; |
| 2635 | sprintf(disk->disk_name, "drbd%d", minor); |
| 2636 | disk->private_data = mdev; |
| 2637 | |
| 2638 | mdev->this_bdev = bdget(MKDEV(DRBD_MAJOR, minor)); |
| 2639 | /* we have no partitions. we contain only ourselves. */ |
| 2640 | mdev->this_bdev->bd_contains = mdev->this_bdev; |
| 2641 | |
| 2642 | q->backing_dev_info.congested_fn = drbd_congested; |
| 2643 | q->backing_dev_info.congested_data = mdev; |
| 2644 | |
Andreas Gruenbacher | 2f58dcf | 2010-12-13 17:48:19 +0100 | [diff] [blame] | 2645 | blk_queue_make_request(q, drbd_make_request); |
Lars Ellenberg | a73ff32 | 2012-06-25 19:15:38 +0200 | [diff] [blame] | 2646 | blk_queue_flush(q, REQ_FLUSH | REQ_FUA); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 2647 | /* Setting the max_hw_sectors to an odd value of 8kibyte here |
| 2648 | This triggers a max_bio_size message upon first attach or connect */ |
| 2649 | blk_queue_max_hw_sectors(q, DRBD_MAX_BIO_SIZE_SAFE >> 8); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2650 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
| 2651 | blk_queue_merge_bvec(q, drbd_merge_bvec); |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 2652 | q->queue_lock = &mdev->tconn->req_lock; /* needed since we use */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2653 | |
| 2654 | mdev->md_io_page = alloc_page(GFP_KERNEL); |
| 2655 | if (!mdev->md_io_page) |
| 2656 | goto out_no_io_page; |
| 2657 | |
| 2658 | if (drbd_bm_init(mdev)) |
| 2659 | goto out_no_bitmap; |
Andreas Gruenbacher | dac1389 | 2011-01-21 17:18:39 +0100 | [diff] [blame] | 2660 | mdev->read_requests = RB_ROOT; |
Andreas Gruenbacher | de69671 | 2011-01-20 15:00:24 +0100 | [diff] [blame] | 2661 | mdev->write_requests = RB_ROOT; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2662 | |
Tejun Heo | 56de210 | 2013-02-27 17:04:01 -0800 | [diff] [blame] | 2663 | minor_got = idr_alloc(&minors, mdev, minor, minor + 1, GFP_KERNEL); |
| 2664 | if (minor_got < 0) { |
| 2665 | if (minor_got == -ENOSPC) { |
| 2666 | err = ERR_MINOR_EXISTS; |
| 2667 | drbd_msg_put_info("requested minor exists already"); |
| 2668 | } |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2669 | goto out_no_minor_idr; |
Tejun Heo | 56de210 | 2013-02-27 17:04:01 -0800 | [diff] [blame] | 2670 | } |
| 2671 | |
| 2672 | vnr_got = idr_alloc(&tconn->volumes, mdev, vnr, vnr + 1, GFP_KERNEL); |
| 2673 | if (vnr_got < 0) { |
| 2674 | if (vnr_got == -ENOSPC) { |
| 2675 | err = ERR_INVALID_REQUEST; |
| 2676 | drbd_msg_put_info("requested volume exists already"); |
| 2677 | } |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2678 | goto out_idr_remove_minor; |
Lars Ellenberg | 569083c | 2011-03-07 09:49:02 +0100 | [diff] [blame] | 2679 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2680 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2681 | add_disk(disk); |
Philipp Reisner | 81fa2e6 | 2011-05-04 15:10:30 +0200 | [diff] [blame] | 2682 | kref_init(&mdev->kref); /* one ref for both idrs and the the add_disk */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2683 | |
Philipp Reisner | 2325eb6 | 2011-03-15 16:56:18 +0100 | [diff] [blame] | 2684 | /* inherit the connection state */ |
| 2685 | mdev->state.conn = tconn->cstate; |
| 2686 | if (mdev->state.conn == C_WF_REPORT_PARAMS) |
Philipp Reisner | c141ebd | 2011-05-05 16:13:10 +0200 | [diff] [blame] | 2687 | drbd_connected(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2688 | |
Philipp Reisner | 774b305 | 2011-02-22 02:07:03 -0500 | [diff] [blame] | 2689 | return NO_ERROR; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2690 | |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2691 | out_idr_remove_minor: |
| 2692 | idr_remove(&minors, minor_got); |
Lars Ellenberg | 569083c | 2011-03-07 09:49:02 +0100 | [diff] [blame] | 2693 | synchronize_rcu(); |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2694 | out_no_minor_idr: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2695 | drbd_bm_cleanup(mdev); |
| 2696 | out_no_bitmap: |
| 2697 | __free_page(mdev->md_io_page); |
| 2698 | out_no_io_page: |
| 2699 | put_disk(disk); |
| 2700 | out_no_disk: |
| 2701 | blk_cleanup_queue(q); |
| 2702 | out_no_q: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2703 | kfree(mdev); |
Philipp Reisner | 9dc9fbb | 2011-04-22 15:23:32 +0200 | [diff] [blame] | 2704 | kref_put(&tconn->kref, &conn_destroy); |
Lars Ellenberg | 8432b31 | 2011-03-08 16:11:16 +0100 | [diff] [blame] | 2705 | return err; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2706 | } |
| 2707 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2708 | int __init drbd_init(void) |
| 2709 | { |
| 2710 | int err; |
| 2711 | |
Philipp Reisner | 2b8a90b | 2011-01-10 11:15:17 +0100 | [diff] [blame] | 2712 | if (minor_count < DRBD_MINOR_COUNT_MIN || minor_count > DRBD_MINOR_COUNT_MAX) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2713 | printk(KERN_ERR |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2714 | "drbd: invalid minor_count (%d)\n", minor_count); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2715 | #ifdef MODULE |
| 2716 | return -EINVAL; |
| 2717 | #else |
Andreas Gruenbacher | 46530e8 | 2011-05-31 13:08:53 +0200 | [diff] [blame] | 2718 | minor_count = DRBD_MINOR_COUNT_DEF; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2719 | #endif |
| 2720 | } |
| 2721 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2722 | err = register_blkdev(DRBD_MAJOR, "drbd"); |
| 2723 | if (err) { |
| 2724 | printk(KERN_ERR |
| 2725 | "drbd: unable to register block device major %d\n", |
| 2726 | DRBD_MAJOR); |
| 2727 | return err; |
| 2728 | } |
| 2729 | |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2730 | err = drbd_genl_register(); |
| 2731 | if (err) { |
| 2732 | printk(KERN_ERR "drbd: unable to register generic netlink family\n"); |
| 2733 | goto fail; |
| 2734 | } |
| 2735 | |
| 2736 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2737 | register_reboot_notifier(&drbd_notifier); |
| 2738 | |
| 2739 | /* |
| 2740 | * allocate all necessary structs |
| 2741 | */ |
| 2742 | err = -ENOMEM; |
| 2743 | |
| 2744 | init_waitqueue_head(&drbd_pp_wait); |
| 2745 | |
| 2746 | drbd_proc = NULL; /* play safe for drbd_cleanup */ |
Philipp Reisner | 81a5d60 | 2011-02-22 19:53:16 -0500 | [diff] [blame] | 2747 | idr_init(&minors); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2748 | |
| 2749 | err = drbd_create_mempools(); |
| 2750 | if (err) |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2751 | goto fail; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2752 | |
Lars Ellenberg | 8c484ee | 2010-03-11 16:47:58 +0100 | [diff] [blame] | 2753 | drbd_proc = proc_create_data("drbd", S_IFREG | S_IRUGO , NULL, &drbd_proc_fops, NULL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2754 | if (!drbd_proc) { |
| 2755 | printk(KERN_ERR "drbd: unable to register proc file\n"); |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2756 | goto fail; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2757 | } |
| 2758 | |
| 2759 | rwlock_init(&global_state_lock); |
Philipp Reisner | 2111438 | 2011-01-19 12:26:59 +0100 | [diff] [blame] | 2760 | INIT_LIST_HEAD(&drbd_tconns); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2761 | |
Lars Ellenberg | 2312f0b3 | 2011-11-24 10:36:25 +0100 | [diff] [blame] | 2762 | retry.wq = create_singlethread_workqueue("drbd-reissue"); |
| 2763 | if (!retry.wq) { |
| 2764 | printk(KERN_ERR "drbd: unable to create retry workqueue\n"); |
| 2765 | goto fail; |
| 2766 | } |
| 2767 | INIT_WORK(&retry.worker, do_retry); |
| 2768 | spin_lock_init(&retry.lock); |
| 2769 | INIT_LIST_HEAD(&retry.writes); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2770 | |
| 2771 | printk(KERN_INFO "drbd: initialized. " |
| 2772 | "Version: " REL_VERSION " (api:%d/proto:%d-%d)\n", |
| 2773 | API_VERSION, PRO_VERSION_MIN, PRO_VERSION_MAX); |
| 2774 | printk(KERN_INFO "drbd: %s\n", drbd_buildtag()); |
| 2775 | printk(KERN_INFO "drbd: registered as block device major %d\n", |
| 2776 | DRBD_MAJOR); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2777 | |
| 2778 | return 0; /* Success! */ |
| 2779 | |
Lars Ellenberg | 3b98c0c | 2011-03-07 12:49:34 +0100 | [diff] [blame] | 2780 | fail: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2781 | drbd_cleanup(); |
| 2782 | if (err == -ENOMEM) |
| 2783 | /* currently always the case */ |
| 2784 | printk(KERN_ERR "drbd: ran out of memory\n"); |
| 2785 | else |
| 2786 | printk(KERN_ERR "drbd: initialization failure\n"); |
| 2787 | return err; |
| 2788 | } |
| 2789 | |
| 2790 | void drbd_free_bc(struct drbd_backing_dev *ldev) |
| 2791 | { |
| 2792 | if (ldev == NULL) |
| 2793 | return; |
| 2794 | |
Tejun Heo | e525fd8 | 2010-11-13 11:55:17 +0100 | [diff] [blame] | 2795 | blkdev_put(ldev->backing_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
| 2796 | blkdev_put(ldev->md_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2797 | |
| 2798 | kfree(ldev); |
| 2799 | } |
| 2800 | |
Philipp Reisner | 360cc74 | 2011-02-08 14:29:53 +0100 | [diff] [blame] | 2801 | void drbd_free_sock(struct drbd_tconn *tconn) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2802 | { |
Philipp Reisner | 360cc74 | 2011-02-08 14:29:53 +0100 | [diff] [blame] | 2803 | if (tconn->data.socket) { |
| 2804 | mutex_lock(&tconn->data.mutex); |
| 2805 | kernel_sock_shutdown(tconn->data.socket, SHUT_RDWR); |
| 2806 | sock_release(tconn->data.socket); |
| 2807 | tconn->data.socket = NULL; |
| 2808 | mutex_unlock(&tconn->data.mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2809 | } |
Philipp Reisner | 360cc74 | 2011-02-08 14:29:53 +0100 | [diff] [blame] | 2810 | if (tconn->meta.socket) { |
| 2811 | mutex_lock(&tconn->meta.mutex); |
| 2812 | kernel_sock_shutdown(tconn->meta.socket, SHUT_RDWR); |
| 2813 | sock_release(tconn->meta.socket); |
| 2814 | tconn->meta.socket = NULL; |
| 2815 | mutex_unlock(&tconn->meta.mutex); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2816 | } |
| 2817 | } |
| 2818 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2819 | /* meta data management */ |
| 2820 | |
Philipp Reisner | 19fffd7 | 2012-08-28 16:48:03 +0200 | [diff] [blame] | 2821 | void conn_md_sync(struct drbd_tconn *tconn) |
| 2822 | { |
| 2823 | struct drbd_conf *mdev; |
| 2824 | int vnr; |
| 2825 | |
| 2826 | rcu_read_lock(); |
| 2827 | idr_for_each_entry(&tconn->volumes, mdev, vnr) { |
| 2828 | kref_get(&mdev->kref); |
| 2829 | rcu_read_unlock(); |
| 2830 | drbd_md_sync(mdev); |
| 2831 | kref_put(&mdev->kref, &drbd_minor_destroy); |
| 2832 | rcu_read_lock(); |
| 2833 | } |
| 2834 | rcu_read_unlock(); |
| 2835 | } |
| 2836 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame^] | 2837 | /* aligned 4kByte */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2838 | struct meta_data_on_disk { |
| 2839 | u64 la_size; /* last agreed size. */ |
| 2840 | u64 uuid[UI_SIZE]; /* UUIDs. */ |
| 2841 | u64 device_uuid; |
| 2842 | u64 reserved_u64_1; |
| 2843 | u32 flags; /* MDF */ |
| 2844 | u32 magic; |
| 2845 | u32 md_size_sect; |
| 2846 | u32 al_offset; /* offset to this block */ |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame^] | 2847 | u32 al_nr_extents; /* important for restoring the AL (userspace) */ |
Lars Ellenberg | f399002 | 2011-03-23 14:31:09 +0100 | [diff] [blame] | 2848 | /* `-- act_log->nr_elements <-- ldev->dc.al_extents */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2849 | u32 bm_offset; /* offset to the bitmap, from here */ |
| 2850 | u32 bm_bytes_per_bit; /* BM_BLOCK_SIZE */ |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 2851 | u32 la_peer_max_bio_size; /* last peer max_bio_size */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2852 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame^] | 2853 | u8 reserved_u8[4096 - (7*8 + 8*4)]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2854 | } __packed; |
| 2855 | |
| 2856 | /** |
| 2857 | * drbd_md_sync() - Writes the meta data super block if the MD_DIRTY flag bit is set |
| 2858 | * @mdev: DRBD device. |
| 2859 | */ |
| 2860 | void drbd_md_sync(struct drbd_conf *mdev) |
| 2861 | { |
| 2862 | struct meta_data_on_disk *buffer; |
| 2863 | sector_t sector; |
| 2864 | int i; |
| 2865 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame^] | 2866 | /* Don't accidentally change the DRBD meta data layout. */ |
| 2867 | BUILD_BUG_ON(UI_SIZE != 4); |
| 2868 | BUILD_BUG_ON(sizeof(struct meta_data_on_disk) != 4096); |
| 2869 | |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 2870 | del_timer(&mdev->md_sync_timer); |
| 2871 | /* timer may be rearmed by drbd_md_mark_dirty() now. */ |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2872 | if (!test_and_clear_bit(MD_DIRTY, &mdev->flags)) |
| 2873 | return; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2874 | |
| 2875 | /* We use here D_FAILED and not D_ATTACHING because we try to write |
| 2876 | * metadata even if we detach due to a disk failure! */ |
| 2877 | if (!get_ldev_if_state(mdev, D_FAILED)) |
| 2878 | return; |
| 2879 | |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 2880 | buffer = drbd_md_get_buffer(mdev); |
| 2881 | if (!buffer) |
| 2882 | goto out; |
| 2883 | |
Lars Ellenberg | ae8bf31 | 2013-03-19 18:16:43 +0100 | [diff] [blame^] | 2884 | memset(buffer, 0, sizeof(*buffer)); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2885 | |
| 2886 | buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev)); |
| 2887 | for (i = UI_CURRENT; i < UI_SIZE; i++) |
| 2888 | buffer->uuid[i] = cpu_to_be64(mdev->ldev->md.uuid[i]); |
| 2889 | buffer->flags = cpu_to_be32(mdev->ldev->md.flags); |
Lars Ellenberg | d5d7ebd | 2011-07-05 20:59:26 +0200 | [diff] [blame] | 2890 | buffer->magic = cpu_to_be32(DRBD_MD_MAGIC_84_UNCLEAN); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2891 | |
| 2892 | buffer->md_size_sect = cpu_to_be32(mdev->ldev->md.md_size_sect); |
| 2893 | buffer->al_offset = cpu_to_be32(mdev->ldev->md.al_offset); |
| 2894 | buffer->al_nr_extents = cpu_to_be32(mdev->act_log->nr_elements); |
| 2895 | buffer->bm_bytes_per_bit = cpu_to_be32(BM_BLOCK_SIZE); |
| 2896 | buffer->device_uuid = cpu_to_be64(mdev->ldev->md.device_uuid); |
| 2897 | |
| 2898 | buffer->bm_offset = cpu_to_be32(mdev->ldev->md.bm_offset); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 2899 | buffer->la_peer_max_bio_size = cpu_to_be32(mdev->peer_max_bio_size); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2900 | |
| 2901 | D_ASSERT(drbd_md_ss__(mdev, mdev->ldev) == mdev->ldev->md.md_offset); |
| 2902 | sector = mdev->ldev->md.md_offset; |
| 2903 | |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 2904 | if (drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE)) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2905 | /* this was a try anyways ... */ |
| 2906 | dev_err(DEV, "meta data update failed!\n"); |
Lars Ellenberg | 383606e | 2012-06-14 14:21:32 +0200 | [diff] [blame] | 2907 | drbd_chk_io_error(mdev, 1, DRBD_META_IO_ERROR); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2908 | } |
| 2909 | |
| 2910 | /* Update mdev->ldev->md.la_size_sect, |
| 2911 | * since we updated it on metadata. */ |
| 2912 | mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev); |
| 2913 | |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 2914 | drbd_md_put_buffer(mdev); |
| 2915 | out: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2916 | put_ldev(mdev); |
| 2917 | } |
| 2918 | |
| 2919 | /** |
| 2920 | * drbd_md_read() - Reads in the meta data super block |
| 2921 | * @mdev: DRBD device. |
| 2922 | * @bdev: Device from which the meta data should be read in. |
| 2923 | * |
Andreas Gruenbacher | 116676c | 2010-12-08 13:33:11 +0100 | [diff] [blame] | 2924 | * Return 0 (NO_ERROR) on success, and an enum drbd_ret_code in case |
Lars Ellenberg | d5d7ebd | 2011-07-05 20:59:26 +0200 | [diff] [blame] | 2925 | * something goes wrong. |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2926 | */ |
| 2927 | int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev) |
| 2928 | { |
| 2929 | struct meta_data_on_disk *buffer; |
Lars Ellenberg | d5d7ebd | 2011-07-05 20:59:26 +0200 | [diff] [blame] | 2930 | u32 magic, flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2931 | int i, rv = NO_ERROR; |
| 2932 | |
| 2933 | if (!get_ldev_if_state(mdev, D_ATTACHING)) |
| 2934 | return ERR_IO_MD_DISK; |
| 2935 | |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 2936 | buffer = drbd_md_get_buffer(mdev); |
| 2937 | if (!buffer) |
| 2938 | goto out; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2939 | |
Andreas Gruenbacher | 3fbf4d2 | 2010-12-13 02:25:41 +0100 | [diff] [blame] | 2940 | if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) { |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2941 | /* NOTE: can't do normal error processing here as this is |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2942 | called BEFORE disk is attached */ |
| 2943 | dev_err(DEV, "Error while reading metadata.\n"); |
| 2944 | rv = ERR_IO_MD_DISK; |
| 2945 | goto err; |
| 2946 | } |
| 2947 | |
Lars Ellenberg | d5d7ebd | 2011-07-05 20:59:26 +0200 | [diff] [blame] | 2948 | magic = be32_to_cpu(buffer->magic); |
| 2949 | flags = be32_to_cpu(buffer->flags); |
| 2950 | if (magic == DRBD_MD_MAGIC_84_UNCLEAN || |
| 2951 | (magic == DRBD_MD_MAGIC_08 && !(flags & MDF_AL_CLEAN))) { |
| 2952 | /* btw: that's Activity Log clean, not "all" clean. */ |
| 2953 | dev_err(DEV, "Found unclean meta data. Did you \"drbdadm apply-al\"?\n"); |
| 2954 | rv = ERR_MD_UNCLEAN; |
| 2955 | goto err; |
| 2956 | } |
| 2957 | if (magic != DRBD_MD_MAGIC_08) { |
Philipp Reisner | 43de7c8 | 2011-11-10 13:16:13 +0100 | [diff] [blame] | 2958 | if (magic == DRBD_MD_MAGIC_07) |
Lars Ellenberg | d5d7ebd | 2011-07-05 20:59:26 +0200 | [diff] [blame] | 2959 | dev_err(DEV, "Found old (0.7) meta data magic. Did you \"drbdadm create-md\"?\n"); |
| 2960 | else |
| 2961 | dev_err(DEV, "Meta data magic not found. Did you \"drbdadm create-md\"?\n"); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2962 | rv = ERR_MD_INVALID; |
| 2963 | goto err; |
| 2964 | } |
| 2965 | if (be32_to_cpu(buffer->al_offset) != bdev->md.al_offset) { |
| 2966 | dev_err(DEV, "unexpected al_offset: %d (expected %d)\n", |
| 2967 | be32_to_cpu(buffer->al_offset), bdev->md.al_offset); |
| 2968 | rv = ERR_MD_INVALID; |
| 2969 | goto err; |
| 2970 | } |
| 2971 | if (be32_to_cpu(buffer->bm_offset) != bdev->md.bm_offset) { |
| 2972 | dev_err(DEV, "unexpected bm_offset: %d (expected %d)\n", |
| 2973 | be32_to_cpu(buffer->bm_offset), bdev->md.bm_offset); |
| 2974 | rv = ERR_MD_INVALID; |
| 2975 | goto err; |
| 2976 | } |
| 2977 | if (be32_to_cpu(buffer->md_size_sect) != bdev->md.md_size_sect) { |
| 2978 | dev_err(DEV, "unexpected md_size: %u (expected %u)\n", |
| 2979 | be32_to_cpu(buffer->md_size_sect), bdev->md.md_size_sect); |
| 2980 | rv = ERR_MD_INVALID; |
| 2981 | goto err; |
| 2982 | } |
| 2983 | |
| 2984 | if (be32_to_cpu(buffer->bm_bytes_per_bit) != BM_BLOCK_SIZE) { |
| 2985 | dev_err(DEV, "unexpected bm_bytes_per_bit: %u (expected %u)\n", |
| 2986 | be32_to_cpu(buffer->bm_bytes_per_bit), BM_BLOCK_SIZE); |
| 2987 | rv = ERR_MD_INVALID; |
| 2988 | goto err; |
| 2989 | } |
| 2990 | |
| 2991 | bdev->md.la_size_sect = be64_to_cpu(buffer->la_size); |
| 2992 | for (i = UI_CURRENT; i < UI_SIZE; i++) |
| 2993 | bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]); |
| 2994 | bdev->md.flags = be32_to_cpu(buffer->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 2995 | bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid); |
| 2996 | |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 2997 | spin_lock_irq(&mdev->tconn->req_lock); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 2998 | if (mdev->state.conn < C_CONNECTED) { |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 2999 | unsigned int peer; |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 3000 | peer = be32_to_cpu(buffer->la_peer_max_bio_size); |
Lars Ellenberg | db141b2 | 2012-06-25 19:15:58 +0200 | [diff] [blame] | 3001 | peer = max(peer, DRBD_MAX_BIO_SIZE_SAFE); |
Philipp Reisner | 99432fc | 2011-05-20 16:39:13 +0200 | [diff] [blame] | 3002 | mdev->peer_max_bio_size = peer; |
| 3003 | } |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 3004 | spin_unlock_irq(&mdev->tconn->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3005 | |
| 3006 | err: |
Philipp Reisner | e171173 | 2011-06-27 11:51:46 +0200 | [diff] [blame] | 3007 | drbd_md_put_buffer(mdev); |
| 3008 | out: |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3009 | put_ldev(mdev); |
| 3010 | |
| 3011 | return rv; |
| 3012 | } |
| 3013 | |
| 3014 | /** |
| 3015 | * drbd_md_mark_dirty() - Mark meta data super block as dirty |
| 3016 | * @mdev: DRBD device. |
| 3017 | * |
| 3018 | * Call this function if you change anything that should be written to |
| 3019 | * the meta-data super block. This function sets MD_DIRTY, and starts a |
| 3020 | * timer that ensures that within five seconds you have to call drbd_md_sync(). |
| 3021 | */ |
Lars Ellenberg | ca0e609 | 2010-10-14 15:01:21 +0200 | [diff] [blame] | 3022 | #ifdef DEBUG |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 3023 | void drbd_md_mark_dirty_(struct drbd_conf *mdev, unsigned int line, const char *func) |
| 3024 | { |
| 3025 | if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) { |
| 3026 | mod_timer(&mdev->md_sync_timer, jiffies + HZ); |
| 3027 | mdev->last_md_mark_dirty.line = line; |
| 3028 | mdev->last_md_mark_dirty.func = func; |
| 3029 | } |
| 3030 | } |
| 3031 | #else |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3032 | void drbd_md_mark_dirty(struct drbd_conf *mdev) |
| 3033 | { |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 3034 | if (!test_and_set_bit(MD_DIRTY, &mdev->flags)) |
Lars Ellenberg | ca0e609 | 2010-10-14 15:01:21 +0200 | [diff] [blame] | 3035 | mod_timer(&mdev->md_sync_timer, jiffies + 5*HZ); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3036 | } |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 3037 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3038 | |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3039 | void drbd_uuid_move_history(struct drbd_conf *mdev) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3040 | { |
| 3041 | int i; |
| 3042 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 3043 | for (i = UI_HISTORY_START; i < UI_HISTORY_END; i++) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3044 | mdev->ldev->md.uuid[i+1] = mdev->ldev->md.uuid[i]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3045 | } |
| 3046 | |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3047 | void __drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3048 | { |
| 3049 | if (idx == UI_CURRENT) { |
| 3050 | if (mdev->state.role == R_PRIMARY) |
| 3051 | val |= 1; |
| 3052 | else |
| 3053 | val &= ~((u64)1); |
| 3054 | |
| 3055 | drbd_set_ed_uuid(mdev, val); |
| 3056 | } |
| 3057 | |
| 3058 | mdev->ldev->md.uuid[idx] = val; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3059 | drbd_md_mark_dirty(mdev); |
| 3060 | } |
| 3061 | |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3062 | void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) |
| 3063 | { |
| 3064 | unsigned long flags; |
| 3065 | spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); |
| 3066 | __drbd_uuid_set(mdev, idx, val); |
| 3067 | spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); |
| 3068 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3069 | |
| 3070 | void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local) |
| 3071 | { |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3072 | unsigned long flags; |
| 3073 | spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3074 | if (mdev->ldev->md.uuid[idx]) { |
| 3075 | drbd_uuid_move_history(mdev); |
| 3076 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[idx]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3077 | } |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3078 | __drbd_uuid_set(mdev, idx, val); |
| 3079 | spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3080 | } |
| 3081 | |
| 3082 | /** |
| 3083 | * drbd_uuid_new_current() - Creates a new current UUID |
| 3084 | * @mdev: DRBD device. |
| 3085 | * |
| 3086 | * Creates a new current UUID, and rotates the old current UUID into |
| 3087 | * the bitmap slot. Causes an incremental resync upon next connect. |
| 3088 | */ |
| 3089 | void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local) |
| 3090 | { |
| 3091 | u64 val; |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3092 | unsigned long long bm_uuid; |
| 3093 | |
| 3094 | get_random_bytes(&val, sizeof(u64)); |
| 3095 | |
| 3096 | spin_lock_irq(&mdev->ldev->md.uuid_lock); |
| 3097 | bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3098 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 3099 | if (bm_uuid) |
| 3100 | dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid); |
| 3101 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3102 | mdev->ldev->md.uuid[UI_BITMAP] = mdev->ldev->md.uuid[UI_CURRENT]; |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3103 | __drbd_uuid_set(mdev, UI_CURRENT, val); |
| 3104 | spin_unlock_irq(&mdev->ldev->md.uuid_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3105 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 3106 | drbd_print_uuids(mdev, "new current UUID"); |
Lars Ellenberg | aaa8e2b | 2010-10-15 13:16:53 +0200 | [diff] [blame] | 3107 | /* get it to stable storage _now_ */ |
| 3108 | drbd_md_sync(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3109 | } |
| 3110 | |
| 3111 | void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local) |
| 3112 | { |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3113 | unsigned long flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3114 | if (mdev->ldev->md.uuid[UI_BITMAP] == 0 && val == 0) |
| 3115 | return; |
| 3116 | |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3117 | spin_lock_irqsave(&mdev->ldev->md.uuid_lock, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3118 | if (val == 0) { |
| 3119 | drbd_uuid_move_history(mdev); |
| 3120 | mdev->ldev->md.uuid[UI_HISTORY_START] = mdev->ldev->md.uuid[UI_BITMAP]; |
| 3121 | mdev->ldev->md.uuid[UI_BITMAP] = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3122 | } else { |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 3123 | unsigned long long bm_uuid = mdev->ldev->md.uuid[UI_BITMAP]; |
| 3124 | if (bm_uuid) |
| 3125 | dev_warn(DEV, "bm UUID was already set: %llX\n", bm_uuid); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3126 | |
Lars Ellenberg | 62b0da3 | 2011-01-20 13:25:21 +0100 | [diff] [blame] | 3127 | mdev->ldev->md.uuid[UI_BITMAP] = val & ~((u64)1); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3128 | } |
Philipp Reisner | 9f2247b | 2012-08-16 14:25:58 +0200 | [diff] [blame] | 3129 | spin_unlock_irqrestore(&mdev->ldev->md.uuid_lock, flags); |
| 3130 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3131 | drbd_md_mark_dirty(mdev); |
| 3132 | } |
| 3133 | |
| 3134 | /** |
| 3135 | * drbd_bmio_set_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() |
| 3136 | * @mdev: DRBD device. |
| 3137 | * |
| 3138 | * Sets all bits in the bitmap and writes the whole bitmap to stable storage. |
| 3139 | */ |
| 3140 | int drbd_bmio_set_n_write(struct drbd_conf *mdev) |
| 3141 | { |
| 3142 | int rv = -EIO; |
| 3143 | |
| 3144 | if (get_ldev_if_state(mdev, D_ATTACHING)) { |
| 3145 | drbd_md_set_flag(mdev, MDF_FULL_SYNC); |
| 3146 | drbd_md_sync(mdev); |
| 3147 | drbd_bm_set_all(mdev); |
| 3148 | |
| 3149 | rv = drbd_bm_write(mdev); |
| 3150 | |
| 3151 | if (!rv) { |
| 3152 | drbd_md_clear_flag(mdev, MDF_FULL_SYNC); |
| 3153 | drbd_md_sync(mdev); |
| 3154 | } |
| 3155 | |
| 3156 | put_ldev(mdev); |
| 3157 | } |
| 3158 | |
| 3159 | return rv; |
| 3160 | } |
| 3161 | |
| 3162 | /** |
| 3163 | * drbd_bmio_clear_n_write() - io_fn for drbd_queue_bitmap_io() or drbd_bitmap_io() |
| 3164 | * @mdev: DRBD device. |
| 3165 | * |
| 3166 | * Clears all bits in the bitmap and writes the whole bitmap to stable storage. |
| 3167 | */ |
| 3168 | int drbd_bmio_clear_n_write(struct drbd_conf *mdev) |
| 3169 | { |
| 3170 | int rv = -EIO; |
| 3171 | |
Philipp Reisner | 0778286 | 2010-08-31 12:00:50 +0200 | [diff] [blame] | 3172 | drbd_resume_al(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3173 | if (get_ldev_if_state(mdev, D_ATTACHING)) { |
| 3174 | drbd_bm_clear_all(mdev); |
| 3175 | rv = drbd_bm_write(mdev); |
| 3176 | put_ldev(mdev); |
| 3177 | } |
| 3178 | |
| 3179 | return rv; |
| 3180 | } |
| 3181 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3182 | static int w_bitmap_io(struct drbd_work *w, int unused) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3183 | { |
| 3184 | struct bm_io_work *work = container_of(w, struct bm_io_work, w); |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 3185 | struct drbd_conf *mdev = w->mdev; |
Lars Ellenberg | 02851e9 | 2010-12-16 14:47:39 +0100 | [diff] [blame] | 3186 | int rv = -EIO; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3187 | |
| 3188 | D_ASSERT(atomic_read(&mdev->ap_bio_cnt) == 0); |
| 3189 | |
Lars Ellenberg | 02851e9 | 2010-12-16 14:47:39 +0100 | [diff] [blame] | 3190 | if (get_ldev(mdev)) { |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3191 | drbd_bm_lock(mdev, work->why, work->flags); |
Lars Ellenberg | 02851e9 | 2010-12-16 14:47:39 +0100 | [diff] [blame] | 3192 | rv = work->io_fn(mdev); |
| 3193 | drbd_bm_unlock(mdev); |
| 3194 | put_ldev(mdev); |
| 3195 | } |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3196 | |
Lars Ellenberg | 4738fa1 | 2011-02-21 13:20:55 +0100 | [diff] [blame] | 3197 | clear_bit_unlock(BITMAP_IO, &mdev->flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3198 | wake_up(&mdev->misc_wait); |
| 3199 | |
| 3200 | if (work->done) |
| 3201 | work->done(mdev, rv); |
| 3202 | |
| 3203 | clear_bit(BITMAP_IO_QUEUED, &mdev->flags); |
| 3204 | work->why = NULL; |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3205 | work->flags = 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3206 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3207 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3208 | } |
| 3209 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 3210 | void drbd_ldev_destroy(struct drbd_conf *mdev) |
| 3211 | { |
| 3212 | lc_destroy(mdev->resync); |
| 3213 | mdev->resync = NULL; |
| 3214 | lc_destroy(mdev->act_log); |
| 3215 | mdev->act_log = NULL; |
| 3216 | __no_warn(local, |
| 3217 | drbd_free_bc(mdev->ldev); |
| 3218 | mdev->ldev = NULL;); |
| 3219 | |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 3220 | clear_bit(GO_DISKLESS, &mdev->flags); |
| 3221 | } |
| 3222 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3223 | static int w_go_diskless(struct drbd_work *w, int unused) |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 3224 | { |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 3225 | struct drbd_conf *mdev = w->mdev; |
| 3226 | |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 3227 | D_ASSERT(mdev->state.disk == D_FAILED); |
Lars Ellenberg | 9d28287 | 2010-10-14 13:57:07 +0200 | [diff] [blame] | 3228 | /* we cannot assert local_cnt == 0 here, as get_ldev_if_state will |
| 3229 | * inc/dec it frequently. Once we are D_DISKLESS, no one will touch |
Lars Ellenberg | 82f59cc | 2010-10-16 12:13:47 +0200 | [diff] [blame] | 3230 | * the protected members anymore, though, so once put_ldev reaches zero |
| 3231 | * again, it will be safe to free them. */ |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 3232 | |
| 3233 | /* Try to write changed bitmap pages, read errors may have just |
| 3234 | * set some bits outside the area covered by the activity log. |
| 3235 | * |
| 3236 | * If we have an IO error during the bitmap writeout, |
| 3237 | * we will want a full sync next time, just in case. |
| 3238 | * (Do we want a specific meta data flag for this?) |
| 3239 | * |
| 3240 | * If that does not make it to stable storage either, |
Philipp Reisner | fd0017c | 2012-10-19 14:19:23 +0200 | [diff] [blame] | 3241 | * we cannot do anything about that anymore. |
| 3242 | * |
| 3243 | * We still need to check if both bitmap and ldev are present, we may |
| 3244 | * end up here after a failed attach, before ldev was even assigned. |
| 3245 | */ |
| 3246 | if (mdev->bitmap && mdev->ldev) { |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 3247 | if (drbd_bitmap_io_from_worker(mdev, drbd_bm_write, |
| 3248 | "detach", BM_LOCKED_MASK)) { |
Lars Ellenberg | edc9f5e | 2012-09-27 15:18:21 +0200 | [diff] [blame] | 3249 | if (test_bit(WAS_READ_ERROR, &mdev->flags)) { |
Lars Ellenberg | a2a3c74f | 2012-09-22 12:26:57 +0200 | [diff] [blame] | 3250 | drbd_md_set_flag(mdev, MDF_FULL_SYNC); |
| 3251 | drbd_md_sync(mdev); |
| 3252 | } |
| 3253 | } |
| 3254 | } |
| 3255 | |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 3256 | drbd_force_state(mdev, NS(disk, D_DISKLESS)); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3257 | return 0; |
Lars Ellenberg | e9e6f3e | 2010-09-14 20:26:27 +0200 | [diff] [blame] | 3258 | } |
| 3259 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3260 | /** |
| 3261 | * drbd_queue_bitmap_io() - Queues an IO operation on the whole bitmap |
| 3262 | * @mdev: DRBD device. |
| 3263 | * @io_fn: IO callback to be called when bitmap IO is possible |
| 3264 | * @done: callback to be called after the bitmap IO was performed |
| 3265 | * @why: Descriptive text of the reason for doing the IO |
| 3266 | * |
| 3267 | * While IO on the bitmap happens we freeze application IO thus we ensure |
| 3268 | * that drbd_set_out_of_sync() can not be called. This function MAY ONLY be |
| 3269 | * called from worker context. It MUST NOT be used while a previous such |
| 3270 | * work is still pending! |
| 3271 | */ |
| 3272 | void drbd_queue_bitmap_io(struct drbd_conf *mdev, |
| 3273 | int (*io_fn)(struct drbd_conf *), |
| 3274 | void (*done)(struct drbd_conf *, int), |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3275 | char *why, enum bm_flag flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3276 | { |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 3277 | D_ASSERT(current == mdev->tconn->worker.task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3278 | |
| 3279 | D_ASSERT(!test_bit(BITMAP_IO_QUEUED, &mdev->flags)); |
| 3280 | D_ASSERT(!test_bit(BITMAP_IO, &mdev->flags)); |
| 3281 | D_ASSERT(list_empty(&mdev->bm_io_work.w.list)); |
| 3282 | if (mdev->bm_io_work.why) |
| 3283 | dev_err(DEV, "FIXME going to queue '%s' but '%s' still pending?\n", |
| 3284 | why, mdev->bm_io_work.why); |
| 3285 | |
| 3286 | mdev->bm_io_work.io_fn = io_fn; |
| 3287 | mdev->bm_io_work.done = done; |
| 3288 | mdev->bm_io_work.why = why; |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3289 | mdev->bm_io_work.flags = flags; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3290 | |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 3291 | spin_lock_irq(&mdev->tconn->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3292 | set_bit(BITMAP_IO, &mdev->flags); |
| 3293 | if (atomic_read(&mdev->ap_bio_cnt) == 0) { |
Philipp Reisner | 127b317 | 2010-11-16 10:07:53 +0100 | [diff] [blame] | 3294 | if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) |
Lars Ellenberg | d5b27b0 | 2011-11-14 15:42:37 +0100 | [diff] [blame] | 3295 | drbd_queue_work(&mdev->tconn->sender_work, &mdev->bm_io_work.w); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3296 | } |
Philipp Reisner | 87eeee4 | 2011-01-19 14:16:30 +0100 | [diff] [blame] | 3297 | spin_unlock_irq(&mdev->tconn->req_lock); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3298 | } |
| 3299 | |
| 3300 | /** |
| 3301 | * drbd_bitmap_io() - Does an IO operation on the whole bitmap |
| 3302 | * @mdev: DRBD device. |
| 3303 | * @io_fn: IO callback to be called when bitmap IO is possible |
| 3304 | * @why: Descriptive text of the reason for doing the IO |
| 3305 | * |
| 3306 | * freezes application IO while that the actual IO operations runs. This |
| 3307 | * functions MAY NOT be called from worker context. |
| 3308 | */ |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3309 | int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), |
| 3310 | char *why, enum bm_flag flags) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3311 | { |
| 3312 | int rv; |
| 3313 | |
Philipp Reisner | e6b3ea8 | 2011-01-19 14:02:01 +0100 | [diff] [blame] | 3314 | D_ASSERT(current != mdev->tconn->worker.task); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3315 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3316 | if ((flags & BM_LOCKED_SET_ALLOWED) == 0) |
| 3317 | drbd_suspend_io(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3318 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3319 | drbd_bm_lock(mdev, why, flags); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3320 | rv = io_fn(mdev); |
| 3321 | drbd_bm_unlock(mdev); |
| 3322 | |
Lars Ellenberg | 20ceb2b | 2011-01-21 10:56:44 +0100 | [diff] [blame] | 3323 | if ((flags & BM_LOCKED_SET_ALLOWED) == 0) |
| 3324 | drbd_resume_io(mdev); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3325 | |
| 3326 | return rv; |
| 3327 | } |
| 3328 | |
| 3329 | void drbd_md_set_flag(struct drbd_conf *mdev, int flag) __must_hold(local) |
| 3330 | { |
| 3331 | if ((mdev->ldev->md.flags & flag) != flag) { |
| 3332 | drbd_md_mark_dirty(mdev); |
| 3333 | mdev->ldev->md.flags |= flag; |
| 3334 | } |
| 3335 | } |
| 3336 | |
| 3337 | void drbd_md_clear_flag(struct drbd_conf *mdev, int flag) __must_hold(local) |
| 3338 | { |
| 3339 | if ((mdev->ldev->md.flags & flag) != 0) { |
| 3340 | drbd_md_mark_dirty(mdev); |
| 3341 | mdev->ldev->md.flags &= ~flag; |
| 3342 | } |
| 3343 | } |
| 3344 | int drbd_md_test_flag(struct drbd_backing_dev *bdev, int flag) |
| 3345 | { |
| 3346 | return (bdev->md.flags & flag) != 0; |
| 3347 | } |
| 3348 | |
| 3349 | static void md_sync_timer_fn(unsigned long data) |
| 3350 | { |
| 3351 | struct drbd_conf *mdev = (struct drbd_conf *) data; |
| 3352 | |
Lars Ellenberg | b792b65 | 2012-08-22 14:59:06 +0200 | [diff] [blame] | 3353 | /* must not double-queue! */ |
| 3354 | if (list_empty(&mdev->md_sync_work.list)) |
| 3355 | drbd_queue_work_front(&mdev->tconn->sender_work, &mdev->md_sync_work); |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3356 | } |
| 3357 | |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3358 | static int w_md_sync(struct drbd_work *w, int unused) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3359 | { |
Philipp Reisner | 00d5694 | 2011-02-09 18:09:48 +0100 | [diff] [blame] | 3360 | struct drbd_conf *mdev = w->mdev; |
| 3361 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3362 | dev_warn(DEV, "md_sync_timer expired! Worker calls drbd_md_sync().\n"); |
Lars Ellenberg | ee15b03 | 2010-09-03 10:00:09 +0200 | [diff] [blame] | 3363 | #ifdef DEBUG |
| 3364 | dev_warn(DEV, "last md_mark_dirty: %s:%u\n", |
| 3365 | mdev->last_md_mark_dirty.func, mdev->last_md_mark_dirty.line); |
| 3366 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3367 | drbd_md_sync(mdev); |
Andreas Gruenbacher | 99920dc | 2011-03-16 15:31:39 +0100 | [diff] [blame] | 3368 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3369 | } |
| 3370 | |
Andreas Gruenbacher | d876302 | 2011-01-26 17:39:41 +0100 | [diff] [blame] | 3371 | const char *cmdname(enum drbd_packet cmd) |
Andreas Gruenbacher | f2ad906 | 2011-01-26 17:13:25 +0100 | [diff] [blame] | 3372 | { |
| 3373 | /* THINK may need to become several global tables |
| 3374 | * when we want to support more than |
| 3375 | * one PRO_VERSION */ |
| 3376 | static const char *cmdnames[] = { |
| 3377 | [P_DATA] = "Data", |
| 3378 | [P_DATA_REPLY] = "DataReply", |
| 3379 | [P_RS_DATA_REPLY] = "RSDataReply", |
| 3380 | [P_BARRIER] = "Barrier", |
| 3381 | [P_BITMAP] = "ReportBitMap", |
| 3382 | [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", |
| 3383 | [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", |
| 3384 | [P_UNPLUG_REMOTE] = "UnplugRemote", |
| 3385 | [P_DATA_REQUEST] = "DataRequest", |
| 3386 | [P_RS_DATA_REQUEST] = "RSDataRequest", |
| 3387 | [P_SYNC_PARAM] = "SyncParam", |
| 3388 | [P_SYNC_PARAM89] = "SyncParam89", |
| 3389 | [P_PROTOCOL] = "ReportProtocol", |
| 3390 | [P_UUIDS] = "ReportUUIDs", |
| 3391 | [P_SIZES] = "ReportSizes", |
| 3392 | [P_STATE] = "ReportState", |
| 3393 | [P_SYNC_UUID] = "ReportSyncUUID", |
| 3394 | [P_AUTH_CHALLENGE] = "AuthChallenge", |
| 3395 | [P_AUTH_RESPONSE] = "AuthResponse", |
| 3396 | [P_PING] = "Ping", |
| 3397 | [P_PING_ACK] = "PingAck", |
| 3398 | [P_RECV_ACK] = "RecvAck", |
| 3399 | [P_WRITE_ACK] = "WriteAck", |
| 3400 | [P_RS_WRITE_ACK] = "RSWriteAck", |
Lars Ellenberg | d4dabbe | 2012-08-01 12:33:51 +0200 | [diff] [blame] | 3401 | [P_SUPERSEDED] = "Superseded", |
Andreas Gruenbacher | f2ad906 | 2011-01-26 17:13:25 +0100 | [diff] [blame] | 3402 | [P_NEG_ACK] = "NegAck", |
| 3403 | [P_NEG_DREPLY] = "NegDReply", |
| 3404 | [P_NEG_RS_DREPLY] = "NegRSDReply", |
| 3405 | [P_BARRIER_ACK] = "BarrierAck", |
| 3406 | [P_STATE_CHG_REQ] = "StateChgRequest", |
| 3407 | [P_STATE_CHG_REPLY] = "StateChgReply", |
| 3408 | [P_OV_REQUEST] = "OVRequest", |
| 3409 | [P_OV_REPLY] = "OVReply", |
| 3410 | [P_OV_RESULT] = "OVResult", |
| 3411 | [P_CSUM_RS_REQUEST] = "CsumRSRequest", |
| 3412 | [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", |
| 3413 | [P_COMPRESSED_BITMAP] = "CBitmap", |
| 3414 | [P_DELAY_PROBE] = "DelayProbe", |
| 3415 | [P_OUT_OF_SYNC] = "OutOfSync", |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 3416 | [P_RETRY_WRITE] = "RetryWrite", |
Lars Ellenberg | ae25b33 | 2011-04-24 00:01:16 +0200 | [diff] [blame] | 3417 | [P_RS_CANCEL] = "RSCancel", |
| 3418 | [P_CONN_ST_CHG_REQ] = "conn_st_chg_req", |
| 3419 | [P_CONN_ST_CHG_REPLY] = "conn_st_chg_reply", |
Philipp Reisner | 036b17e | 2011-05-16 17:38:11 +0200 | [diff] [blame] | 3420 | [P_RETRY_WRITE] = "retry_write", |
| 3421 | [P_PROTOCOL_UPDATE] = "protocol_update", |
Lars Ellenberg | ae25b33 | 2011-04-24 00:01:16 +0200 | [diff] [blame] | 3422 | |
| 3423 | /* enum drbd_packet, but not commands - obsoleted flags: |
| 3424 | * P_MAY_IGNORE |
| 3425 | * P_MAX_OPT_CMD |
| 3426 | */ |
Andreas Gruenbacher | f2ad906 | 2011-01-26 17:13:25 +0100 | [diff] [blame] | 3427 | }; |
| 3428 | |
Lars Ellenberg | ae25b33 | 2011-04-24 00:01:16 +0200 | [diff] [blame] | 3429 | /* too big for the array: 0xfffX */ |
Andreas Gruenbacher | e5d6f33 | 2011-03-28 16:44:40 +0200 | [diff] [blame] | 3430 | if (cmd == P_INITIAL_META) |
| 3431 | return "InitialMeta"; |
| 3432 | if (cmd == P_INITIAL_DATA) |
| 3433 | return "InitialData"; |
Andreas Gruenbacher | 6038178 | 2011-03-28 17:05:50 +0200 | [diff] [blame] | 3434 | if (cmd == P_CONNECTION_FEATURES) |
| 3435 | return "ConnectionFeatures"; |
Andreas Gruenbacher | 6e849ce | 2011-03-14 17:27:45 +0100 | [diff] [blame] | 3436 | if (cmd >= ARRAY_SIZE(cmdnames)) |
Andreas Gruenbacher | f2ad906 | 2011-01-26 17:13:25 +0100 | [diff] [blame] | 3437 | return "Unknown"; |
| 3438 | return cmdnames[cmd]; |
| 3439 | } |
| 3440 | |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 3441 | /** |
| 3442 | * drbd_wait_misc - wait for a request to make progress |
| 3443 | * @mdev: device associated with the request |
| 3444 | * @i: the struct drbd_interval embedded in struct drbd_request or |
| 3445 | * struct drbd_peer_request |
| 3446 | */ |
| 3447 | int drbd_wait_misc(struct drbd_conf *mdev, struct drbd_interval *i) |
| 3448 | { |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 3449 | struct net_conf *nc; |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 3450 | DEFINE_WAIT(wait); |
| 3451 | long timeout; |
| 3452 | |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 3453 | rcu_read_lock(); |
| 3454 | nc = rcu_dereference(mdev->tconn->net_conf); |
| 3455 | if (!nc) { |
| 3456 | rcu_read_unlock(); |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 3457 | return -ETIMEDOUT; |
Philipp Reisner | 44ed167 | 2011-04-19 17:10:19 +0200 | [diff] [blame] | 3458 | } |
| 3459 | timeout = nc->ko_count ? nc->timeout * HZ / 10 * nc->ko_count : MAX_SCHEDULE_TIMEOUT; |
| 3460 | rcu_read_unlock(); |
Andreas Gruenbacher | 7be8da0 | 2011-02-22 02:15:32 +0100 | [diff] [blame] | 3461 | |
| 3462 | /* Indicate to wake up mdev->misc_wait on progress. */ |
| 3463 | i->waiting = true; |
| 3464 | prepare_to_wait(&mdev->misc_wait, &wait, TASK_INTERRUPTIBLE); |
| 3465 | spin_unlock_irq(&mdev->tconn->req_lock); |
| 3466 | timeout = schedule_timeout(timeout); |
| 3467 | finish_wait(&mdev->misc_wait, &wait); |
| 3468 | spin_lock_irq(&mdev->tconn->req_lock); |
| 3469 | if (!timeout || mdev->state.conn < C_CONNECTED) |
| 3470 | return -ETIMEDOUT; |
| 3471 | if (signal_pending(current)) |
| 3472 | return -ERESTARTSYS; |
| 3473 | return 0; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3474 | } |
| 3475 | |
| 3476 | #ifdef CONFIG_DRBD_FAULT_INJECTION |
| 3477 | /* Fault insertion support including random number generator shamelessly |
| 3478 | * stolen from kernel/rcutorture.c */ |
| 3479 | struct fault_random_state { |
| 3480 | unsigned long state; |
| 3481 | unsigned long count; |
| 3482 | }; |
| 3483 | |
| 3484 | #define FAULT_RANDOM_MULT 39916801 /* prime */ |
| 3485 | #define FAULT_RANDOM_ADD 479001701 /* prime */ |
| 3486 | #define FAULT_RANDOM_REFRESH 10000 |
| 3487 | |
| 3488 | /* |
| 3489 | * Crude but fast random-number generator. Uses a linear congruential |
| 3490 | * generator, with occasional help from get_random_bytes(). |
| 3491 | */ |
| 3492 | static unsigned long |
| 3493 | _drbd_fault_random(struct fault_random_state *rsp) |
| 3494 | { |
| 3495 | long refresh; |
| 3496 | |
Roel Kluin | 49829ea | 2009-12-15 22:55:44 +0100 | [diff] [blame] | 3497 | if (!rsp->count--) { |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3498 | get_random_bytes(&refresh, sizeof(refresh)); |
| 3499 | rsp->state += refresh; |
| 3500 | rsp->count = FAULT_RANDOM_REFRESH; |
| 3501 | } |
| 3502 | rsp->state = rsp->state * FAULT_RANDOM_MULT + FAULT_RANDOM_ADD; |
| 3503 | return swahw32(rsp->state); |
| 3504 | } |
| 3505 | |
| 3506 | static char * |
| 3507 | _drbd_fault_str(unsigned int type) { |
| 3508 | static char *_faults[] = { |
| 3509 | [DRBD_FAULT_MD_WR] = "Meta-data write", |
| 3510 | [DRBD_FAULT_MD_RD] = "Meta-data read", |
| 3511 | [DRBD_FAULT_RS_WR] = "Resync write", |
| 3512 | [DRBD_FAULT_RS_RD] = "Resync read", |
| 3513 | [DRBD_FAULT_DT_WR] = "Data write", |
| 3514 | [DRBD_FAULT_DT_RD] = "Data read", |
| 3515 | [DRBD_FAULT_DT_RA] = "Data read ahead", |
| 3516 | [DRBD_FAULT_BM_ALLOC] = "BM allocation", |
Philipp Reisner | 6b4388a | 2010-04-26 14:11:45 +0200 | [diff] [blame] | 3517 | [DRBD_FAULT_AL_EE] = "EE allocation", |
| 3518 | [DRBD_FAULT_RECEIVE] = "receive data corruption", |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3519 | }; |
| 3520 | |
| 3521 | return (type < DRBD_FAULT_MAX) ? _faults[type] : "**Unknown**"; |
| 3522 | } |
| 3523 | |
| 3524 | unsigned int |
| 3525 | _drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) |
| 3526 | { |
| 3527 | static struct fault_random_state rrs = {0, 0}; |
| 3528 | |
| 3529 | unsigned int ret = ( |
| 3530 | (fault_devs == 0 || |
| 3531 | ((1 << mdev_to_minor(mdev)) & fault_devs) != 0) && |
| 3532 | (((_drbd_fault_random(&rrs) % 100) + 1) <= fault_rate)); |
| 3533 | |
| 3534 | if (ret) { |
| 3535 | fault_count++; |
| 3536 | |
Lars Ellenberg | 7383506 | 2010-05-27 11:51:56 +0200 | [diff] [blame] | 3537 | if (__ratelimit(&drbd_ratelimit_state)) |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3538 | dev_warn(DEV, "***Simulating %s failure\n", |
| 3539 | _drbd_fault_str(type)); |
| 3540 | } |
| 3541 | |
| 3542 | return ret; |
| 3543 | } |
| 3544 | #endif |
| 3545 | |
| 3546 | const char *drbd_buildtag(void) |
| 3547 | { |
| 3548 | /* DRBD built from external sources has here a reference to the |
| 3549 | git hash of the source code. */ |
| 3550 | |
| 3551 | static char buildtag[38] = "\0uilt-in"; |
| 3552 | |
| 3553 | if (buildtag[0] == 0) { |
Cong Wang | bc4854b | 2012-04-03 14:13:36 +0800 | [diff] [blame] | 3554 | #ifdef MODULE |
| 3555 | sprintf(buildtag, "srcversion: %-24s", THIS_MODULE->srcversion); |
| 3556 | #else |
| 3557 | buildtag[0] = 'b'; |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3558 | #endif |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3559 | } |
| 3560 | |
| 3561 | return buildtag; |
| 3562 | } |
| 3563 | |
| 3564 | module_init(drbd_init) |
| 3565 | module_exit(drbd_cleanup) |
| 3566 | |
Philipp Reisner | b411b36 | 2009-09-25 16:07:19 -0700 | [diff] [blame] | 3567 | EXPORT_SYMBOL(drbd_conn_str); |
| 3568 | EXPORT_SYMBOL(drbd_role_str); |
| 3569 | EXPORT_SYMBOL(drbd_disk_str); |
| 3570 | EXPORT_SYMBOL(drbd_set_st_err_str); |