| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.gnu.org/licenses/gpl-2.0.html |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| * |
| * Copyright (c) 2011, 2015, Intel Corporation. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * Implementation of cl_object for LOV layer. |
| * |
| * Author: Nikita Danilov <nikita.danilov@sun.com> |
| * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com> |
| */ |
| |
| #define DEBUG_SUBSYSTEM S_LOV |
| |
| #include "lov_cl_internal.h" |
| |
| static inline struct lov_device *lov_object_dev(struct lov_object *obj) |
| { |
| return lu2lov_dev(obj->lo_cl.co_lu.lo_dev); |
| } |
| |
| /** \addtogroup lov |
| * @{ |
| */ |
| |
| /***************************************************************************** |
| * |
| * Layout operations. |
| * |
| */ |
| |
| struct lov_layout_operations { |
| int (*llo_init)(const struct lu_env *env, struct lov_device *dev, |
| struct lov_object *lov, struct lov_stripe_md *lsm, |
| const struct cl_object_conf *conf, |
| union lov_layout_state *state); |
| int (*llo_delete)(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state); |
| void (*llo_fini)(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state); |
| void (*llo_install)(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state); |
| int (*llo_print)(const struct lu_env *env, void *cookie, |
| lu_printer_t p, const struct lu_object *o); |
| int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj, |
| struct cl_page *page, pgoff_t index); |
| int (*llo_lock_init)(const struct lu_env *env, |
| struct cl_object *obj, struct cl_lock *lock, |
| const struct cl_io *io); |
| int (*llo_io_init)(const struct lu_env *env, |
| struct cl_object *obj, struct cl_io *io); |
| int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj, |
| struct cl_attr *attr); |
| }; |
| |
| static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov); |
| |
| static void lov_lsm_put(struct lov_stripe_md *lsm) |
| { |
| if (lsm) |
| lov_free_memmd(&lsm); |
| } |
| |
| /***************************************************************************** |
| * |
| * Lov object layout operations. |
| * |
| */ |
| |
| static void lov_install_empty(const struct lu_env *env, |
| struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| /* |
| * File without objects. |
| */ |
| } |
| |
| static int lov_init_empty(const struct lu_env *env, struct lov_device *dev, |
| struct lov_object *lov, struct lov_stripe_md *lsm, |
| const struct cl_object_conf *conf, |
| union lov_layout_state *state) |
| { |
| return 0; |
| } |
| |
| static void lov_install_raid0(const struct lu_env *env, |
| struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| } |
| |
| static struct cl_object *lov_sub_find(const struct lu_env *env, |
| struct cl_device *dev, |
| const struct lu_fid *fid, |
| const struct cl_object_conf *conf) |
| { |
| struct lu_object *o; |
| |
| o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu); |
| LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type)); |
| return lu2cl(o); |
| } |
| |
| static int lov_init_sub(const struct lu_env *env, struct lov_object *lov, |
| struct cl_object *stripe, struct lov_layout_raid0 *r0, |
| int idx) |
| { |
| struct cl_object_header *hdr; |
| struct cl_object_header *subhdr; |
| struct cl_object_header *parent; |
| struct lov_oinfo *oinfo; |
| int result; |
| |
| if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) { |
| /* For sanity:test_206. |
| * Do not leave the object in cache to avoid accessing |
| * freed memory. This is because osc_object is referring to |
| * lov_oinfo of lsm_stripe_data which will be freed due to |
| * this failure. |
| */ |
| cl_object_kill(env, stripe); |
| cl_object_put(env, stripe); |
| return -EIO; |
| } |
| |
| hdr = cl_object_header(lov2cl(lov)); |
| subhdr = cl_object_header(stripe); |
| |
| oinfo = lov->lo_lsm->lsm_oinfo[idx]; |
| CDEBUG(D_INODE, DFID "@%p[%d] -> " DFID "@%p: ostid: " DOSTID " idx: %d gen: %d\n", |
| PFID(&subhdr->coh_lu.loh_fid), subhdr, idx, |
| PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi), |
| oinfo->loi_ost_idx, oinfo->loi_ost_gen); |
| |
| /* reuse ->coh_attr_guard to protect coh_parent change */ |
| spin_lock(&subhdr->coh_attr_guard); |
| parent = subhdr->coh_parent; |
| if (!parent) { |
| subhdr->coh_parent = hdr; |
| spin_unlock(&subhdr->coh_attr_guard); |
| subhdr->coh_nesting = hdr->coh_nesting + 1; |
| lu_object_ref_add(&stripe->co_lu, "lov-parent", lov); |
| r0->lo_sub[idx] = cl2lovsub(stripe); |
| r0->lo_sub[idx]->lso_super = lov; |
| r0->lo_sub[idx]->lso_index = idx; |
| result = 0; |
| } else { |
| struct lu_object *old_obj; |
| struct lov_object *old_lov; |
| unsigned int mask = D_INODE; |
| |
| spin_unlock(&subhdr->coh_attr_guard); |
| old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type); |
| LASSERT(old_obj); |
| old_lov = cl2lov(lu2cl(old_obj)); |
| if (old_lov->lo_layout_invalid) { |
| /* the object's layout has already changed but isn't |
| * refreshed |
| */ |
| lu_object_unhash(env, &stripe->co_lu); |
| result = -EAGAIN; |
| } else { |
| mask = D_ERROR; |
| result = -EIO; |
| } |
| |
| LU_OBJECT_DEBUG(mask, env, &stripe->co_lu, |
| "stripe %d is already owned.", idx); |
| LU_OBJECT_DEBUG(mask, env, old_obj, "owned."); |
| LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n"); |
| cl_object_put(env, stripe); |
| } |
| return result; |
| } |
| |
| static int lov_page_slice_fixup(struct lov_object *lov, |
| struct cl_object *stripe) |
| { |
| struct cl_object_header *hdr = cl_object_header(&lov->lo_cl); |
| struct cl_object *o; |
| |
| if (!stripe) |
| return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off - |
| cfs_size_round(sizeof(struct lov_page)); |
| |
| cl_object_for_each(o, stripe) |
| o->co_slice_off += hdr->coh_page_bufsize; |
| |
| return cl_object_header(stripe)->coh_page_bufsize; |
| } |
| |
| static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev, |
| struct lov_object *lov, struct lov_stripe_md *lsm, |
| const struct cl_object_conf *conf, |
| union lov_layout_state *state) |
| { |
| int result; |
| int i; |
| |
| struct cl_object *stripe; |
| struct lov_thread_info *lti = lov_env_info(env); |
| struct cl_object_conf *subconf = <i->lti_stripe_conf; |
| struct lu_fid *ofid = <i->lti_fid; |
| struct lov_layout_raid0 *r0 = &state->raid0; |
| |
| if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) { |
| dump_lsm(D_ERROR, lsm); |
| LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n", |
| LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic); |
| } |
| |
| LASSERT(!lov->lo_lsm); |
| lov->lo_lsm = lsm_addref(lsm); |
| lov->lo_layout_invalid = true; |
| r0->lo_nr = lsm->lsm_stripe_count; |
| LASSERT(r0->lo_nr <= lov_targets_nr(dev)); |
| |
| r0->lo_sub = libcfs_kvzalloc(r0->lo_nr * sizeof(r0->lo_sub[0]), |
| GFP_NOFS); |
| if (r0->lo_sub) { |
| int psz = 0; |
| |
| result = 0; |
| subconf->coc_inode = conf->coc_inode; |
| spin_lock_init(&r0->lo_sub_lock); |
| /* |
| * Create stripe cl_objects. |
| */ |
| for (i = 0; i < r0->lo_nr && result == 0; ++i) { |
| struct cl_device *subdev; |
| struct lov_oinfo *oinfo = lsm->lsm_oinfo[i]; |
| int ost_idx = oinfo->loi_ost_idx; |
| |
| if (lov_oinfo_is_dummy(oinfo)) |
| continue; |
| |
| result = ostid_to_fid(ofid, &oinfo->loi_oi, |
| oinfo->loi_ost_idx); |
| if (result != 0) |
| goto out; |
| |
| if (!dev->ld_target[ost_idx]) { |
| CERROR("%s: OST %04x is not initialized\n", |
| lov2obd(dev->ld_lov)->obd_name, ost_idx); |
| result = -EIO; |
| goto out; |
| } |
| |
| subdev = lovsub2cl_dev(dev->ld_target[ost_idx]); |
| subconf->u.coc_oinfo = oinfo; |
| LASSERTF(subdev, "not init ost %d\n", ost_idx); |
| /* In the function below, .hs_keycmp resolves to |
| * lu_obj_hop_keycmp() |
| */ |
| /* coverity[overrun-buffer-val] */ |
| stripe = lov_sub_find(env, subdev, ofid, subconf); |
| if (!IS_ERR(stripe)) { |
| result = lov_init_sub(env, lov, stripe, r0, i); |
| if (result == -EAGAIN) { /* try again */ |
| --i; |
| result = 0; |
| continue; |
| } |
| } else { |
| result = PTR_ERR(stripe); |
| } |
| |
| if (result == 0) { |
| int sz = lov_page_slice_fixup(lov, stripe); |
| |
| LASSERT(ergo(psz > 0, psz == sz)); |
| psz = sz; |
| } |
| } |
| if (result == 0) |
| cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz; |
| } else { |
| result = -ENOMEM; |
| } |
| out: |
| return result; |
| } |
| |
| static int lov_init_released(const struct lu_env *env, struct lov_device *dev, |
| struct lov_object *lov, struct lov_stripe_md *lsm, |
| const struct cl_object_conf *conf, |
| union lov_layout_state *state) |
| { |
| LASSERT(lsm); |
| LASSERT(lsm_is_released(lsm)); |
| LASSERT(!lov->lo_lsm); |
| |
| lov->lo_lsm = lsm_addref(lsm); |
| return 0; |
| } |
| |
| static struct cl_object *lov_find_subobj(const struct lu_env *env, |
| struct lov_object *lov, |
| struct lov_stripe_md *lsm, |
| int stripe_idx) |
| { |
| struct lov_device *dev = lu2lov_dev(lov2lu(lov)->lo_dev); |
| struct lov_oinfo *oinfo = lsm->lsm_oinfo[stripe_idx]; |
| struct lov_thread_info *lti = lov_env_info(env); |
| struct lu_fid *ofid = <i->lti_fid; |
| struct cl_device *subdev; |
| struct cl_object *result; |
| int ost_idx; |
| int rc; |
| |
| if (lov->lo_type != LLT_RAID0) { |
| result = NULL; |
| goto out; |
| } |
| |
| ost_idx = oinfo->loi_ost_idx; |
| rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx); |
| if (rc) { |
| result = NULL; |
| goto out; |
| } |
| |
| subdev = lovsub2cl_dev(dev->ld_target[ost_idx]); |
| result = lov_sub_find(env, subdev, ofid, NULL); |
| out: |
| if (!result) |
| result = ERR_PTR(-EINVAL); |
| return result; |
| } |
| |
| static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED); |
| |
| lov_layout_wait(env, lov); |
| return 0; |
| } |
| |
| static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov, |
| struct lovsub_object *los, int idx) |
| { |
| struct cl_object *sub; |
| struct lov_layout_raid0 *r0; |
| struct lu_site *site; |
| struct lu_site_bkt_data *bkt; |
| wait_queue_entry_t *waiter; |
| |
| r0 = &lov->u.raid0; |
| LASSERT(r0->lo_sub[idx] == los); |
| |
| sub = lovsub2cl(los); |
| site = sub->co_lu.lo_dev->ld_site; |
| bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid); |
| |
| cl_object_kill(env, sub); |
| /* release a reference to the sub-object and ... */ |
| lu_object_ref_del(&sub->co_lu, "lov-parent", lov); |
| cl_object_put(env, sub); |
| |
| /* ... wait until it is actually destroyed---sub-object clears its |
| * ->lo_sub[] slot in lovsub_object_fini() |
| */ |
| if (r0->lo_sub[idx] == los) { |
| waiter = &lov_env_info(env)->lti_waiter; |
| init_waitqueue_entry(waiter, current); |
| add_wait_queue(&bkt->lsb_marche_funebre, waiter); |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| while (1) { |
| /* this wait-queue is signaled at the end of |
| * lu_object_free(). |
| */ |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| spin_lock(&r0->lo_sub_lock); |
| if (r0->lo_sub[idx] == los) { |
| spin_unlock(&r0->lo_sub_lock); |
| schedule(); |
| } else { |
| spin_unlock(&r0->lo_sub_lock); |
| set_current_state(TASK_RUNNING); |
| break; |
| } |
| } |
| remove_wait_queue(&bkt->lsb_marche_funebre, waiter); |
| } |
| LASSERT(!r0->lo_sub[idx]); |
| } |
| |
| static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| struct lov_layout_raid0 *r0 = &state->raid0; |
| struct lov_stripe_md *lsm = lov->lo_lsm; |
| int i; |
| |
| dump_lsm(D_INODE, lsm); |
| |
| lov_layout_wait(env, lov); |
| if (r0->lo_sub) { |
| for (i = 0; i < r0->lo_nr; ++i) { |
| struct lovsub_object *los = r0->lo_sub[i]; |
| |
| if (los) { |
| cl_object_prune(env, &los->lso_cl); |
| /* |
| * If top-level object is to be evicted from |
| * the cache, so are its sub-objects. |
| */ |
| lov_subobject_kill(env, lov, los, i); |
| } |
| } |
| } |
| return 0; |
| } |
| |
| static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED); |
| } |
| |
| static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| struct lov_layout_raid0 *r0 = &state->raid0; |
| |
| if (r0->lo_sub) { |
| kvfree(r0->lo_sub); |
| r0->lo_sub = NULL; |
| } |
| |
| dump_lsm(D_INODE, lov->lo_lsm); |
| lov_free_memmd(&lov->lo_lsm); |
| } |
| |
| static void lov_fini_released(const struct lu_env *env, struct lov_object *lov, |
| union lov_layout_state *state) |
| { |
| dump_lsm(D_INODE, lov->lo_lsm); |
| lov_free_memmd(&lov->lo_lsm); |
| } |
| |
| static int lov_print_empty(const struct lu_env *env, void *cookie, |
| lu_printer_t p, const struct lu_object *o) |
| { |
| (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid); |
| return 0; |
| } |
| |
| static int lov_print_raid0(const struct lu_env *env, void *cookie, |
| lu_printer_t p, const struct lu_object *o) |
| { |
| struct lov_object *lov = lu2lov(o); |
| struct lov_layout_raid0 *r0 = lov_r0(lov); |
| struct lov_stripe_md *lsm = lov->lo_lsm; |
| int i; |
| |
| (*p)(env, cookie, "stripes: %d, %s, lsm{%p 0x%08X %d %u %u}:\n", |
| r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", lsm, |
| lsm->lsm_magic, atomic_read(&lsm->lsm_refc), |
| lsm->lsm_stripe_count, lsm->lsm_layout_gen); |
| for (i = 0; i < r0->lo_nr; ++i) { |
| struct lu_object *sub; |
| |
| if (r0->lo_sub[i]) { |
| sub = lovsub2lu(r0->lo_sub[i]); |
| lu_object_print(env, cookie, p, sub); |
| } else { |
| (*p)(env, cookie, "sub %d absent\n", i); |
| } |
| } |
| return 0; |
| } |
| |
| static int lov_print_released(const struct lu_env *env, void *cookie, |
| lu_printer_t p, const struct lu_object *o) |
| { |
| struct lov_object *lov = lu2lov(o); |
| struct lov_stripe_md *lsm = lov->lo_lsm; |
| |
| (*p)(env, cookie, |
| "released: %s, lsm{%p 0x%08X %d %u %u}:\n", |
| lov->lo_layout_invalid ? "invalid" : "valid", lsm, |
| lsm->lsm_magic, atomic_read(&lsm->lsm_refc), |
| lsm->lsm_stripe_count, lsm->lsm_layout_gen); |
| return 0; |
| } |
| |
| /** |
| * Implements cl_object_operations::coo_attr_get() method for an object |
| * without stripes (LLT_EMPTY layout type). |
| * |
| * The only attributes this layer is authoritative in this case is |
| * cl_attr::cat_blocks---it's 0. |
| */ |
| static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj, |
| struct cl_attr *attr) |
| { |
| attr->cat_blocks = 0; |
| return 0; |
| } |
| |
| static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj, |
| struct cl_attr *attr) |
| { |
| struct lov_object *lov = cl2lov(obj); |
| struct lov_layout_raid0 *r0 = lov_r0(lov); |
| struct cl_attr *lov_attr = &r0->lo_attr; |
| int result = 0; |
| |
| /* this is called w/o holding type guard mutex, so it must be inside |
| * an on going IO otherwise lsm may be replaced. |
| * LU-2117: it turns out there exists one exception. For mmaped files, |
| * the lock of those files may be requested in the other file's IO |
| * context, and this function is called in ccc_lock_state(), it will |
| * hit this assertion. |
| * Anyway, it's still okay to call attr_get w/o type guard as layout |
| * can't go if locks exist. |
| */ |
| /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */ |
| |
| if (!r0->lo_attr_valid) { |
| struct lov_stripe_md *lsm = lov->lo_lsm; |
| struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb; |
| __u64 kms = 0; |
| |
| memset(lvb, 0, sizeof(*lvb)); |
| /* XXX: timestamps can be negative by sanity:test_39m, |
| * how can it be? |
| */ |
| lvb->lvb_atime = LLONG_MIN; |
| lvb->lvb_ctime = LLONG_MIN; |
| lvb->lvb_mtime = LLONG_MIN; |
| |
| /* |
| * XXX that should be replaced with a loop over sub-objects, |
| * doing cl_object_attr_get() on them. But for now, let's |
| * reuse old lov code. |
| */ |
| |
| /* |
| * XXX take lsm spin-lock to keep lov_merge_lvb_kms() |
| * happy. It's not needed, because new code uses |
| * ->coh_attr_guard spin-lock to protect consistency of |
| * sub-object attributes. |
| */ |
| lov_stripe_lock(lsm); |
| result = lov_merge_lvb_kms(lsm, lvb, &kms); |
| lov_stripe_unlock(lsm); |
| if (result == 0) { |
| cl_lvb2attr(lov_attr, lvb); |
| lov_attr->cat_kms = kms; |
| r0->lo_attr_valid = 1; |
| } |
| } |
| if (result == 0) { /* merge results */ |
| attr->cat_blocks = lov_attr->cat_blocks; |
| attr->cat_size = lov_attr->cat_size; |
| attr->cat_kms = lov_attr->cat_kms; |
| if (attr->cat_atime < lov_attr->cat_atime) |
| attr->cat_atime = lov_attr->cat_atime; |
| if (attr->cat_ctime < lov_attr->cat_ctime) |
| attr->cat_ctime = lov_attr->cat_ctime; |
| if (attr->cat_mtime < lov_attr->cat_mtime) |
| attr->cat_mtime = lov_attr->cat_mtime; |
| } |
| return result; |
| } |
| |
| static const struct lov_layout_operations lov_dispatch[] = { |
| [LLT_EMPTY] = { |
| .llo_init = lov_init_empty, |
| .llo_delete = lov_delete_empty, |
| .llo_fini = lov_fini_empty, |
| .llo_install = lov_install_empty, |
| .llo_print = lov_print_empty, |
| .llo_page_init = lov_page_init_empty, |
| .llo_lock_init = lov_lock_init_empty, |
| .llo_io_init = lov_io_init_empty, |
| .llo_getattr = lov_attr_get_empty |
| }, |
| [LLT_RAID0] = { |
| .llo_init = lov_init_raid0, |
| .llo_delete = lov_delete_raid0, |
| .llo_fini = lov_fini_raid0, |
| .llo_install = lov_install_raid0, |
| .llo_print = lov_print_raid0, |
| .llo_page_init = lov_page_init_raid0, |
| .llo_lock_init = lov_lock_init_raid0, |
| .llo_io_init = lov_io_init_raid0, |
| .llo_getattr = lov_attr_get_raid0 |
| }, |
| [LLT_RELEASED] = { |
| .llo_init = lov_init_released, |
| .llo_delete = lov_delete_empty, |
| .llo_fini = lov_fini_released, |
| .llo_install = lov_install_empty, |
| .llo_print = lov_print_released, |
| .llo_page_init = lov_page_init_empty, |
| .llo_lock_init = lov_lock_init_empty, |
| .llo_io_init = lov_io_init_released, |
| .llo_getattr = lov_attr_get_empty |
| } |
| }; |
| |
| /** |
| * Performs a double-dispatch based on the layout type of an object. |
| */ |
| #define LOV_2DISPATCH_NOLOCK(obj, op, ...) \ |
| ({ \ |
| struct lov_object *__obj = (obj); \ |
| enum lov_layout_type __llt; \ |
| \ |
| __llt = __obj->lo_type; \ |
| LASSERT(__llt < ARRAY_SIZE(lov_dispatch)); \ |
| lov_dispatch[__llt].op(__VA_ARGS__); \ |
| }) |
| |
| /** |
| * Return lov_layout_type associated with a given lsm |
| */ |
| static enum lov_layout_type lov_type(struct lov_stripe_md *lsm) |
| { |
| if (!lsm) |
| return LLT_EMPTY; |
| if (lsm_is_released(lsm)) |
| return LLT_RELEASED; |
| return LLT_RAID0; |
| } |
| |
| static inline void lov_conf_freeze(struct lov_object *lov) |
| { |
| CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n", |
| lov, lov->lo_owner, current); |
| if (lov->lo_owner != current) |
| down_read(&lov->lo_type_guard); |
| } |
| |
| static inline void lov_conf_thaw(struct lov_object *lov) |
| { |
| CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n", |
| lov, lov->lo_owner, current); |
| if (lov->lo_owner != current) |
| up_read(&lov->lo_type_guard); |
| } |
| |
| #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \ |
| ({ \ |
| struct lov_object *__obj = (obj); \ |
| int __lock = !!(lock); \ |
| typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \ |
| \ |
| if (__lock) \ |
| lov_conf_freeze(__obj); \ |
| __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \ |
| if (__lock) \ |
| lov_conf_thaw(__obj); \ |
| __result; \ |
| }) |
| |
| /** |
| * Performs a locked double-dispatch based on the layout type of an object. |
| */ |
| #define LOV_2DISPATCH(obj, op, ...) \ |
| LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__) |
| |
| #define LOV_2DISPATCH_VOID(obj, op, ...) \ |
| do { \ |
| struct lov_object *__obj = (obj); \ |
| enum lov_layout_type __llt; \ |
| \ |
| lov_conf_freeze(__obj); \ |
| __llt = __obj->lo_type; \ |
| LASSERT(__llt < ARRAY_SIZE(lov_dispatch)); \ |
| lov_dispatch[__llt].op(__VA_ARGS__); \ |
| lov_conf_thaw(__obj); \ |
| } while (0) |
| |
| static void lov_conf_lock(struct lov_object *lov) |
| { |
| LASSERT(lov->lo_owner != current); |
| down_write(&lov->lo_type_guard); |
| LASSERT(!lov->lo_owner); |
| lov->lo_owner = current; |
| CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n", |
| lov, lov->lo_owner); |
| } |
| |
| static void lov_conf_unlock(struct lov_object *lov) |
| { |
| CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n", |
| lov, lov->lo_owner); |
| lov->lo_owner = NULL; |
| up_write(&lov->lo_type_guard); |
| } |
| |
| static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov) |
| { |
| struct l_wait_info lwi = { 0 }; |
| |
| while (atomic_read(&lov->lo_active_ios) > 0) { |
| CDEBUG(D_INODE, "file:" DFID " wait for active IO, now: %d.\n", |
| PFID(lu_object_fid(lov2lu(lov))), |
| atomic_read(&lov->lo_active_ios)); |
| |
| l_wait_event(lov->lo_waitq, |
| atomic_read(&lov->lo_active_ios) == 0, &lwi); |
| } |
| return 0; |
| } |
| |
| static int lov_layout_change(const struct lu_env *unused, |
| struct lov_object *lov, struct lov_stripe_md *lsm, |
| const struct cl_object_conf *conf) |
| { |
| struct lov_device *lov_dev = lov_object_dev(lov); |
| enum lov_layout_type llt = lov_type(lsm); |
| union lov_layout_state *state = &lov->u; |
| const struct lov_layout_operations *old_ops; |
| const struct lov_layout_operations *new_ops; |
| struct lu_env *env; |
| u16 refcheck; |
| int rc; |
| |
| LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch)); |
| |
| env = cl_env_get(&refcheck); |
| if (IS_ERR(env)) |
| return PTR_ERR(env); |
| |
| LASSERT(llt < ARRAY_SIZE(lov_dispatch)); |
| |
| CDEBUG(D_INODE, DFID " from %s to %s\n", |
| PFID(lu_object_fid(lov2lu(lov))), |
| llt2str(lov->lo_type), llt2str(llt)); |
| |
| old_ops = &lov_dispatch[lov->lo_type]; |
| new_ops = &lov_dispatch[llt]; |
| |
| rc = cl_object_prune(env, &lov->lo_cl); |
| if (rc) |
| goto out; |
| |
| rc = old_ops->llo_delete(env, lov, &lov->u); |
| if (rc) |
| goto out; |
| |
| old_ops->llo_fini(env, lov, &lov->u); |
| |
| LASSERT(!atomic_read(&lov->lo_active_ios)); |
| |
| CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n", |
| PFID(lu_object_fid(lov2lu(lov))), lov, llt); |
| |
| lov->lo_type = LLT_EMPTY; |
| |
| /* page bufsize fixup */ |
| cl_object_header(&lov->lo_cl)->coh_page_bufsize -= |
| lov_page_slice_fixup(lov, NULL); |
| |
| rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state); |
| if (rc) { |
| struct obd_device *obd = lov2obd(lov_dev->ld_lov); |
| |
| CERROR("%s: cannot apply new layout on " DFID " : rc = %d\n", |
| obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc); |
| new_ops->llo_delete(env, lov, state); |
| new_ops->llo_fini(env, lov, state); |
| /* this file becomes an EMPTY file. */ |
| goto out; |
| } |
| |
| new_ops->llo_install(env, lov, state); |
| lov->lo_type = llt; |
| out: |
| cl_env_put(env, &refcheck); |
| return rc; |
| } |
| |
| /***************************************************************************** |
| * |
| * Lov object operations. |
| * |
| */ |
| int lov_object_init(const struct lu_env *env, struct lu_object *obj, |
| const struct lu_object_conf *conf) |
| { |
| struct lov_object *lov = lu2lov(obj); |
| struct lov_device *dev = lov_object_dev(lov); |
| const struct cl_object_conf *cconf = lu2cl_conf(conf); |
| union lov_layout_state *set = &lov->u; |
| const struct lov_layout_operations *ops; |
| struct lov_stripe_md *lsm = NULL; |
| int rc; |
| |
| init_rwsem(&lov->lo_type_guard); |
| atomic_set(&lov->lo_active_ios, 0); |
| init_waitqueue_head(&lov->lo_waitq); |
| cl_object_page_init(lu2cl(obj), sizeof(struct lov_page)); |
| |
| lov->lo_type = LLT_EMPTY; |
| if (cconf->u.coc_layout.lb_buf) { |
| lsm = lov_unpackmd(dev->ld_lov, |
| cconf->u.coc_layout.lb_buf, |
| cconf->u.coc_layout.lb_len); |
| if (IS_ERR(lsm)) |
| return PTR_ERR(lsm); |
| } |
| |
| /* no locking is necessary, as object is being created */ |
| lov->lo_type = lov_type(lsm); |
| ops = &lov_dispatch[lov->lo_type]; |
| rc = ops->llo_init(env, dev, lov, lsm, cconf, set); |
| if (!rc) |
| ops->llo_install(env, lov, set); |
| |
| lov_lsm_put(lsm); |
| |
| return rc; |
| } |
| |
| static int lov_conf_set(const struct lu_env *env, struct cl_object *obj, |
| const struct cl_object_conf *conf) |
| { |
| struct lov_stripe_md *lsm = NULL; |
| struct lov_object *lov = cl2lov(obj); |
| int result = 0; |
| |
| if (conf->coc_opc == OBJECT_CONF_SET && |
| conf->u.coc_layout.lb_buf) { |
| lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov, |
| conf->u.coc_layout.lb_buf, |
| conf->u.coc_layout.lb_len); |
| if (IS_ERR(lsm)) |
| return PTR_ERR(lsm); |
| } |
| |
| lov_conf_lock(lov); |
| if (conf->coc_opc == OBJECT_CONF_INVALIDATE) { |
| lov->lo_layout_invalid = true; |
| result = 0; |
| goto out; |
| } |
| |
| if (conf->coc_opc == OBJECT_CONF_WAIT) { |
| if (lov->lo_layout_invalid && |
| atomic_read(&lov->lo_active_ios) > 0) { |
| lov_conf_unlock(lov); |
| result = lov_layout_wait(env, lov); |
| lov_conf_lock(lov); |
| } |
| goto out; |
| } |
| |
| LASSERT(conf->coc_opc == OBJECT_CONF_SET); |
| |
| if ((!lsm && !lov->lo_lsm) || |
| ((lsm && lov->lo_lsm) && |
| (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) && |
| (lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) { |
| /* same version of layout */ |
| lov->lo_layout_invalid = false; |
| result = 0; |
| goto out; |
| } |
| |
| /* will change layout - check if there still exists active IO. */ |
| if (atomic_read(&lov->lo_active_ios) > 0) { |
| lov->lo_layout_invalid = true; |
| result = -EBUSY; |
| goto out; |
| } |
| |
| result = lov_layout_change(env, lov, lsm, conf); |
| lov->lo_layout_invalid = result != 0; |
| |
| out: |
| lov_conf_unlock(lov); |
| lov_lsm_put(lsm); |
| CDEBUG(D_INODE, DFID " lo_layout_invalid=%d\n", |
| PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid); |
| return result; |
| } |
| |
| static void lov_object_delete(const struct lu_env *env, struct lu_object *obj) |
| { |
| struct lov_object *lov = lu2lov(obj); |
| |
| LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u); |
| } |
| |
| static void lov_object_free(const struct lu_env *env, struct lu_object *obj) |
| { |
| struct lov_object *lov = lu2lov(obj); |
| |
| LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u); |
| lu_object_fini(obj); |
| kmem_cache_free(lov_object_kmem, lov); |
| } |
| |
| static int lov_object_print(const struct lu_env *env, void *cookie, |
| lu_printer_t p, const struct lu_object *o) |
| { |
| return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o); |
| } |
| |
| int lov_page_init(const struct lu_env *env, struct cl_object *obj, |
| struct cl_page *page, pgoff_t index) |
| { |
| return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page, |
| index); |
| } |
| |
| /** |
| * Implements cl_object_operations::clo_io_init() method for lov |
| * layer. Dispatches to the appropriate layout io initialization method. |
| */ |
| int lov_io_init(const struct lu_env *env, struct cl_object *obj, |
| struct cl_io *io) |
| { |
| CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl); |
| |
| CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n", |
| PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type, |
| io->ci_ignore_layout, io->ci_verify_layout); |
| |
| return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init, |
| !io->ci_ignore_layout, env, obj, io); |
| } |
| |
| /** |
| * An implementation of cl_object_operations::clo_attr_get() method for lov |
| * layer. For raid0 layout this collects and merges attributes of all |
| * sub-objects. |
| */ |
| static int lov_attr_get(const struct lu_env *env, struct cl_object *obj, |
| struct cl_attr *attr) |
| { |
| /* do not take lock, as this function is called under a |
| * spin-lock. Layout is protected from changing by ongoing IO. |
| */ |
| return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr); |
| } |
| |
| static int lov_attr_update(const struct lu_env *env, struct cl_object *obj, |
| const struct cl_attr *attr, unsigned int valid) |
| { |
| /* |
| * No dispatch is required here, as no layout implements this. |
| */ |
| return 0; |
| } |
| |
| int lov_lock_init(const struct lu_env *env, struct cl_object *obj, |
| struct cl_lock *lock, const struct cl_io *io) |
| { |
| /* No need to lock because we've taken one refcount of layout. */ |
| return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock, |
| io); |
| } |
| |
| /** |
| * We calculate on which OST the mapping will end. If the length of mapping |
| * is greater than (stripe_size * stripe_count) then the last_stripe will |
| * will be one just before start_stripe. Else we check if the mapping |
| * intersects each OST and find last_stripe. |
| * This function returns the last_stripe and also sets the stripe_count |
| * over which the mapping is spread |
| * |
| * \param lsm [in] striping information for the file |
| * \param fm_start [in] logical start of mapping |
| * \param fm_end [in] logical end of mapping |
| * \param start_stripe [in] starting stripe of the mapping |
| * \param stripe_count [out] the number of stripes across which to map is |
| * returned |
| * |
| * \retval last_stripe return the last stripe of the mapping |
| */ |
| static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, |
| u64 fm_start, u64 fm_end, |
| int start_stripe, int *stripe_count) |
| { |
| int last_stripe; |
| u64 obd_start; |
| u64 obd_end; |
| int i, j; |
| |
| if (fm_end - fm_start > lsm->lsm_stripe_size * lsm->lsm_stripe_count) { |
| last_stripe = (start_stripe < 1 ? lsm->lsm_stripe_count - 1 : |
| start_stripe - 1); |
| *stripe_count = lsm->lsm_stripe_count; |
| } else { |
| for (j = 0, i = start_stripe; j < lsm->lsm_stripe_count; |
| i = (i + 1) % lsm->lsm_stripe_count, j++) { |
| if (!(lov_stripe_intersects(lsm, i, fm_start, fm_end, |
| &obd_start, &obd_end))) |
| break; |
| } |
| *stripe_count = j; |
| last_stripe = (start_stripe + j - 1) % lsm->lsm_stripe_count; |
| } |
| |
| return last_stripe; |
| } |
| |
| /** |
| * Set fe_device and copy extents from local buffer into main return buffer. |
| * |
| * \param fiemap [out] fiemap to hold all extents |
| * \param lcl_fm_ext [in] array of fiemap extents get from OSC layer |
| * \param ost_index [in] OST index to be written into the fm_device |
| * field for each extent |
| * \param ext_count [in] number of extents to be copied |
| * \param current_extent [in] where to start copying in the extent array |
| */ |
| static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap, |
| struct fiemap_extent *lcl_fm_ext, |
| int ost_index, unsigned int ext_count, |
| int current_extent) |
| { |
| unsigned int ext; |
| char *to; |
| |
| for (ext = 0; ext < ext_count; ext++) { |
| lcl_fm_ext[ext].fe_device = ost_index; |
| lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET; |
| } |
| |
| /* Copy fm_extent's from fm_local to return buffer */ |
| to = (char *)fiemap + fiemap_count_to_size(current_extent); |
| memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent)); |
| } |
| |
| #define FIEMAP_BUFFER_SIZE 4096 |
| |
| /** |
| * Non-zero fe_logical indicates that this is a continuation FIEMAP |
| * call. The local end offset and the device are sent in the first |
| * fm_extent. This function calculates the stripe number from the index. |
| * This function returns a stripe_no on which mapping is to be restarted. |
| * |
| * This function returns fm_end_offset which is the in-OST offset at which |
| * mapping should be restarted. If fm_end_offset=0 is returned then caller |
| * will re-calculate proper offset in next stripe. |
| * Note that the first extent is passed to lov_get_info via the value field. |
| * |
| * \param fiemap [in] fiemap request header |
| * \param lsm [in] striping information for the file |
| * \param fm_start [in] logical start of mapping |
| * \param fm_end [in] logical end of mapping |
| * \param start_stripe [out] starting stripe will be returned in this |
| */ |
| static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap, |
| struct lov_stripe_md *lsm, |
| u64 fm_start, u64 fm_end, |
| int *start_stripe) |
| { |
| u64 local_end = fiemap->fm_extents[0].fe_logical; |
| u64 lun_start, lun_end; |
| u64 fm_end_offset; |
| int stripe_no = -1; |
| int i; |
| |
| if (!fiemap->fm_extent_count || !fiemap->fm_extents[0].fe_logical) |
| return 0; |
| |
| /* Find out stripe_no from ost_index saved in the fe_device */ |
| for (i = 0; i < lsm->lsm_stripe_count; i++) { |
| struct lov_oinfo *oinfo = lsm->lsm_oinfo[i]; |
| |
| if (lov_oinfo_is_dummy(oinfo)) |
| continue; |
| |
| if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) { |
| stripe_no = i; |
| break; |
| } |
| } |
| |
| if (stripe_no == -1) |
| return -EINVAL; |
| |
| /* |
| * If we have finished mapping on previous device, shift logical |
| * offset to start of next device |
| */ |
| if (lov_stripe_intersects(lsm, stripe_no, fm_start, fm_end, |
| &lun_start, &lun_end) && |
| local_end < lun_end) { |
| fm_end_offset = local_end; |
| *start_stripe = stripe_no; |
| } else { |
| /* This is a special value to indicate that caller should |
| * calculate offset in next stripe. |
| */ |
| fm_end_offset = 0; |
| *start_stripe = (stripe_no + 1) % lsm->lsm_stripe_count; |
| } |
| |
| return fm_end_offset; |
| } |
| |
| struct fiemap_state { |
| struct fiemap *fs_fm; |
| u64 fs_start; |
| u64 fs_length; |
| u64 fs_end; |
| u64 fs_end_offset; |
| int fs_cur_extent; |
| int fs_cnt_need; |
| int fs_start_stripe; |
| int fs_last_stripe; |
| bool fs_device_done; |
| bool fs_finish; |
| bool fs_enough; |
| }; |
| |
| static int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj, |
| struct lov_stripe_md *lsm, |
| struct fiemap *fiemap, size_t *buflen, |
| struct ll_fiemap_info_key *fmkey, int stripeno, |
| struct fiemap_state *fs) |
| { |
| struct cl_object *subobj; |
| struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov; |
| struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0]; |
| u64 req_fm_len; /* Stores length of required mapping */ |
| u64 len_mapped_single_call; |
| u64 lun_start; |
| u64 lun_end; |
| u64 obd_object_end; |
| unsigned int ext_count; |
| /* EOF for object */ |
| bool ost_eof = false; |
| /* done with required mapping for this OST? */ |
| bool ost_done = false; |
| int ost_index; |
| int rc = 0; |
| |
| fs->fs_device_done = false; |
| /* Find out range of mapping on this stripe */ |
| if ((lov_stripe_intersects(lsm, stripeno, fs->fs_start, fs->fs_end, |
| &lun_start, &obd_object_end)) == 0) |
| return 0; |
| |
| if (lov_oinfo_is_dummy(lsm->lsm_oinfo[stripeno])) |
| return -EIO; |
| |
| /* If this is a continuation FIEMAP call and we are on |
| * starting stripe then lun_start needs to be set to |
| * end_offset */ |
| if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe) |
| lun_start = fs->fs_end_offset; |
| |
| lun_end = fs->fs_length; |
| if (lun_end != ~0ULL) { |
| /* Handle fs->fs_start + fs->fs_length overflow */ |
| if (fs->fs_start + fs->fs_length < fs->fs_start) |
| fs->fs_length = ~0ULL - fs->fs_start; |
| lun_end = lov_size_to_stripe(lsm, fs->fs_start + fs->fs_length, |
| stripeno); |
| } |
| |
| if (lun_start == lun_end) |
| return 0; |
| |
| req_fm_len = obd_object_end - lun_start; |
| fs->fs_fm->fm_length = 0; |
| len_mapped_single_call = 0; |
| |
| /* find lobsub object */ |
| subobj = lov_find_subobj(env, cl2lov(obj), lsm, stripeno); |
| if (IS_ERR(subobj)) |
| return PTR_ERR(subobj); |
| /* If the output buffer is very large and the objects have many |
| * extents we may need to loop on a single OST repeatedly */ |
| do { |
| if (fiemap->fm_extent_count > 0) { |
| /* Don't get too many extents. */ |
| if (fs->fs_cur_extent + fs->fs_cnt_need > |
| fiemap->fm_extent_count) |
| fs->fs_cnt_need = fiemap->fm_extent_count - |
| fs->fs_cur_extent; |
| } |
| |
| lun_start += len_mapped_single_call; |
| fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call; |
| req_fm_len = fs->fs_fm->fm_length; |
| fs->fs_fm->fm_extent_count = fs->fs_enough ? |
| 1 : fs->fs_cnt_need; |
| fs->fs_fm->fm_mapped_extents = 0; |
| fs->fs_fm->fm_flags = fiemap->fm_flags; |
| |
| ost_index = lsm->lsm_oinfo[stripeno]->loi_ost_idx; |
| |
| if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count) { |
| rc = -EINVAL; |
| goto obj_put; |
| } |
| /* If OST is inactive, return extent with UNKNOWN flag. */ |
| if (!lov->lov_tgts[ost_index]->ltd_active) { |
| fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST; |
| fs->fs_fm->fm_mapped_extents = 1; |
| |
| fm_ext[0].fe_logical = lun_start; |
| fm_ext[0].fe_length = obd_object_end - lun_start; |
| fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN; |
| |
| goto inactive_tgt; |
| } |
| |
| fs->fs_fm->fm_start = lun_start; |
| fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER; |
| memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm)); |
| *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count); |
| |
| rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen); |
| if (rc) |
| goto obj_put; |
| inactive_tgt: |
| ext_count = fs->fs_fm->fm_mapped_extents; |
| if (ext_count == 0) { |
| ost_done = true; |
| fs->fs_device_done = true; |
| /* If last stripe has hold at the end, |
| * we need to return */ |
| if (stripeno == fs->fs_last_stripe) { |
| fiemap->fm_mapped_extents = 0; |
| fs->fs_finish = true; |
| goto obj_put; |
| } |
| break; |
| } else if (fs->fs_enough) { |
| /* |
| * We've collected enough extents and there are |
| * more extents after it. |
| */ |
| fs->fs_finish = true; |
| goto obj_put; |
| } |
| |
| /* If we just need num of extents, got to next device */ |
| if (fiemap->fm_extent_count == 0) { |
| fs->fs_cur_extent += ext_count; |
| break; |
| } |
| |
| /* prepare to copy retrived map extents */ |
| len_mapped_single_call = fm_ext[ext_count - 1].fe_logical + |
| fm_ext[ext_count - 1].fe_length - |
| lun_start; |
| |
| /* Have we finished mapping on this device? */ |
| if (req_fm_len <= len_mapped_single_call) { |
| ost_done = true; |
| fs->fs_device_done = true; |
| } |
| |
| /* Clear the EXTENT_LAST flag which can be present on |
| * the last extent */ |
| if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST) |
| fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST; |
| if (lov_stripe_size(lsm, fm_ext[ext_count - 1].fe_logical + |
| fm_ext[ext_count - 1].fe_length, |
| stripeno) >= fmkey->lfik_oa.o_size) { |
| ost_eof = true; |
| fs->fs_device_done = true; |
| } |
| |
| fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index, |
| ext_count, fs->fs_cur_extent); |
| fs->fs_cur_extent += ext_count; |
| |
| /* Ran out of available extents? */ |
| if (fs->fs_cur_extent >= fiemap->fm_extent_count) |
| fs->fs_enough = true; |
| } while (!ost_done && !ost_eof); |
| |
| if (stripeno == fs->fs_last_stripe) |
| fs->fs_finish = true; |
| obj_put: |
| cl_object_put(env, subobj); |
| |
| return rc; |
| } |
| |
| /** |
| * Break down the FIEMAP request and send appropriate calls to individual OSTs. |
| * This also handles the restarting of FIEMAP calls in case mapping overflows |
| * the available number of extents in single call. |
| * |
| * \param env [in] lustre environment |
| * \param obj [in] file object |
| * \param fmkey [in] fiemap request header and other info |
| * \param fiemap [out] fiemap buffer holding retrived map extents |
| * \param buflen [in/out] max buffer length of @fiemap, when iterate |
| * each OST, it is used to limit max map needed |
| * \retval 0 success |
| * \retval < 0 error |
| */ |
| static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj, |
| struct ll_fiemap_info_key *fmkey, |
| struct fiemap *fiemap, size_t *buflen) |
| { |
| unsigned int buffer_size = FIEMAP_BUFFER_SIZE; |
| struct fiemap *fm_local = NULL; |
| struct lov_stripe_md *lsm; |
| int rc = 0; |
| int cur_stripe; |
| int stripe_count; |
| struct fiemap_state fs = { 0 }; |
| |
| lsm = lov_lsm_addref(cl2lov(obj)); |
| if (!lsm) |
| return -ENODATA; |
| |
| /** |
| * If the stripe_count > 1 and the application does not understand |
| * DEVICE_ORDER flag, it cannot interpret the extents correctly. |
| */ |
| if (lsm->lsm_stripe_count > 1 && |
| !(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) { |
| rc = -ENOTSUPP; |
| goto out; |
| } |
| |
| if (lsm_is_released(lsm)) { |
| if (fiemap->fm_start < fmkey->lfik_oa.o_size) { |
| /** |
| * released file, return a minimal FIEMAP if |
| * request fits in file-size. |
| */ |
| fiemap->fm_mapped_extents = 1; |
| fiemap->fm_extents[0].fe_logical = fiemap->fm_start; |
| if (fiemap->fm_start + fiemap->fm_length < |
| fmkey->lfik_oa.o_size) |
| fiemap->fm_extents[0].fe_length = |
| fiemap->fm_length; |
| else |
| fiemap->fm_extents[0].fe_length = |
| fmkey->lfik_oa.o_size - |
| fiemap->fm_start; |
| fiemap->fm_extents[0].fe_flags |= |
| FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST; |
| } |
| rc = 0; |
| goto out; |
| } |
| |
| if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size) |
| buffer_size = fiemap_count_to_size(fiemap->fm_extent_count); |
| |
| fm_local = libcfs_kvzalloc(buffer_size, GFP_NOFS); |
| if (!fm_local) { |
| rc = -ENOMEM; |
| goto out; |
| } |
| fs.fs_fm = fm_local; |
| fs.fs_cnt_need = fiemap_size_to_count(buffer_size); |
| |
| fs.fs_start = fiemap->fm_start; |
| /* fs_start is beyond the end of the file */ |
| if (fs.fs_start > fmkey->lfik_oa.o_size) { |
| rc = -EINVAL; |
| goto out; |
| } |
| /* Calculate start stripe, last stripe and length of mapping */ |
| fs.fs_start_stripe = lov_stripe_number(lsm, fs.fs_start); |
| fs.fs_end = (fs.fs_length == ~0ULL) ? fmkey->lfik_oa.o_size : |
| fs.fs_start + fs.fs_length - 1; |
| /* If fs_length != ~0ULL but fs_start+fs_length-1 exceeds file size */ |
| if (fs.fs_end > fmkey->lfik_oa.o_size) { |
| fs.fs_end = fmkey->lfik_oa.o_size; |
| fs.fs_length = fs.fs_end - fs.fs_start; |
| } |
| |
| fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, fs.fs_start, fs.fs_end, |
| fs.fs_start_stripe, |
| &stripe_count); |
| fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, fs.fs_start, |
| fs.fs_end, |
| &fs.fs_start_stripe); |
| if (fs.fs_end_offset == -EINVAL) { |
| rc = -EINVAL; |
| goto out; |
| } |
| |
| |
| /** |
| * Requested extent count exceeds the fiemap buffer size, shrink our |
| * ambition. |
| */ |
| if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen) |
| fiemap->fm_extent_count = fiemap_size_to_count(*buflen); |
| if (!fiemap->fm_extent_count) |
| fs.fs_cnt_need = 0; |
| |
| fs.fs_finish = false; |
| fs.fs_enough = false; |
| fs.fs_cur_extent = 0; |
| |
| /* Check each stripe */ |
| for (cur_stripe = fs.fs_start_stripe; stripe_count > 0; |
| --stripe_count, |
| cur_stripe = (cur_stripe + 1) % lsm->lsm_stripe_count) { |
| rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen, fmkey, |
| cur_stripe, &fs); |
| if (rc < 0) |
| goto out; |
| if (fs.fs_finish) |
| break; |
| } /* for each stripe */ |
| /* |
| * Indicate that we are returning device offsets unless file just has |
| * single stripe |
| */ |
| if (lsm->lsm_stripe_count > 1) |
| fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER; |
| |
| if (!fiemap->fm_extent_count) |
| goto skip_last_device_calc; |
| |
| /* |
| * Check if we have reached the last stripe and whether mapping for that |
| * stripe is done. |
| */ |
| if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done) |
| fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |= |
| FIEMAP_EXTENT_LAST; |
| skip_last_device_calc: |
| fiemap->fm_mapped_extents = fs.fs_cur_extent; |
| out: |
| kvfree(fm_local); |
| lov_lsm_put(lsm); |
| return rc; |
| } |
| |
| static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj, |
| struct lov_user_md __user *lum) |
| { |
| struct lov_object *lov = cl2lov(obj); |
| struct lov_stripe_md *lsm; |
| int rc = 0; |
| |
| lsm = lov_lsm_addref(lov); |
| if (!lsm) |
| return -ENODATA; |
| |
| rc = lov_getstripe(cl2lov(obj), lsm, lum); |
| lov_lsm_put(lsm); |
| return rc; |
| } |
| |
| static int lov_object_layout_get(const struct lu_env *env, |
| struct cl_object *obj, |
| struct cl_layout *cl) |
| { |
| struct lov_object *lov = cl2lov(obj); |
| struct lov_stripe_md *lsm = lov_lsm_addref(lov); |
| struct lu_buf *buf = &cl->cl_buf; |
| ssize_t rc; |
| |
| if (!lsm) { |
| cl->cl_size = 0; |
| cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY; |
| return 0; |
| } |
| |
| cl->cl_size = lov_mds_md_size(lsm->lsm_stripe_count, lsm->lsm_magic); |
| cl->cl_layout_gen = lsm->lsm_layout_gen; |
| |
| rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len); |
| lov_lsm_put(lsm); |
| |
| return rc < 0 ? rc : 0; |
| } |
| |
| static loff_t lov_object_maxbytes(struct cl_object *obj) |
| { |
| struct lov_object *lov = cl2lov(obj); |
| struct lov_stripe_md *lsm = lov_lsm_addref(lov); |
| loff_t maxbytes; |
| |
| if (!lsm) |
| return LLONG_MAX; |
| |
| maxbytes = lsm->lsm_maxbytes; |
| |
| lov_lsm_put(lsm); |
| |
| return maxbytes; |
| } |
| |
| static const struct cl_object_operations lov_ops = { |
| .coo_page_init = lov_page_init, |
| .coo_lock_init = lov_lock_init, |
| .coo_io_init = lov_io_init, |
| .coo_attr_get = lov_attr_get, |
| .coo_attr_update = lov_attr_update, |
| .coo_conf_set = lov_conf_set, |
| .coo_getstripe = lov_object_getstripe, |
| .coo_layout_get = lov_object_layout_get, |
| .coo_maxbytes = lov_object_maxbytes, |
| .coo_fiemap = lov_object_fiemap, |
| }; |
| |
| static const struct lu_object_operations lov_lu_obj_ops = { |
| .loo_object_init = lov_object_init, |
| .loo_object_delete = lov_object_delete, |
| .loo_object_release = NULL, |
| .loo_object_free = lov_object_free, |
| .loo_object_print = lov_object_print, |
| .loo_object_invariant = NULL |
| }; |
| |
| struct lu_object *lov_object_alloc(const struct lu_env *env, |
| const struct lu_object_header *unused, |
| struct lu_device *dev) |
| { |
| struct lov_object *lov; |
| struct lu_object *obj; |
| |
| lov = kmem_cache_zalloc(lov_object_kmem, GFP_NOFS); |
| if (lov) { |
| obj = lov2lu(lov); |
| lu_object_init(obj, NULL, dev); |
| lov->lo_cl.co_ops = &lov_ops; |
| lov->lo_type = -1; /* invalid, to catch uninitialized type */ |
| /* |
| * object io operation vector (cl_object::co_iop) is installed |
| * later in lov_object_init(), as different vectors are used |
| * for object with different layouts. |
| */ |
| obj->lo_ops = &lov_lu_obj_ops; |
| } else { |
| obj = NULL; |
| } |
| return obj; |
| } |
| |
| struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov) |
| { |
| struct lov_stripe_md *lsm = NULL; |
| |
| lov_conf_freeze(lov); |
| if (lov->lo_lsm) { |
| lsm = lsm_addref(lov->lo_lsm); |
| CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n", |
| lsm, atomic_read(&lsm->lsm_refc), |
| lov->lo_layout_invalid, current); |
| } |
| lov_conf_thaw(lov); |
| return lsm; |
| } |
| |
| int lov_read_and_clear_async_rc(struct cl_object *clob) |
| { |
| struct lu_object *luobj; |
| int rc = 0; |
| |
| luobj = lu_object_locate(&cl_object_header(clob)->coh_lu, |
| &lov_device_type); |
| if (luobj) { |
| struct lov_object *lov = lu2lov(luobj); |
| |
| lov_conf_freeze(lov); |
| switch (lov->lo_type) { |
| case LLT_RAID0: { |
| struct lov_stripe_md *lsm; |
| int i; |
| |
| lsm = lov->lo_lsm; |
| for (i = 0; i < lsm->lsm_stripe_count; i++) { |
| struct lov_oinfo *loi = lsm->lsm_oinfo[i]; |
| |
| if (lov_oinfo_is_dummy(loi)) |
| continue; |
| |
| if (loi->loi_ar.ar_rc && !rc) |
| rc = loi->loi_ar.ar_rc; |
| loi->loi_ar.ar_rc = 0; |
| } |
| } |
| case LLT_RELEASED: |
| case LLT_EMPTY: |
| break; |
| default: |
| LBUG(); |
| } |
| lov_conf_thaw(lov); |
| } |
| return rc; |
| } |
| EXPORT_SYMBOL(lov_read_and_clear_async_rc); |
| |
| /** @} lov */ |