| |
| /* |
| rbd.c -- Export ceph rados objects as a Linux block device |
| |
| |
| based on drivers/block/osdblk.c: |
| |
| Copyright 2009 Red Hat, Inc. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; see the file COPYING. If not, write to |
| the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
| |
| |
| For usage instructions, please refer to: |
| |
| Documentation/ABI/testing/sysfs-bus-rbd |
| |
| */ |
| |
| #include <linux/ceph/libceph.h> |
| #include <linux/ceph/osd_client.h> |
| #include <linux/ceph/mon_client.h> |
| #include <linux/ceph/cls_lock_client.h> |
| #include <linux/ceph/decode.h> |
| #include <linux/parser.h> |
| #include <linux/bsearch.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/blk-mq.h> |
| #include <linux/fs.h> |
| #include <linux/blkdev.h> |
| #include <linux/slab.h> |
| #include <linux/idr.h> |
| #include <linux/workqueue.h> |
| |
| #include "rbd_types.h" |
| |
| #define RBD_DEBUG /* Activate rbd_assert() calls */ |
| |
| /* |
| * The basic unit of block I/O is a sector. It is interpreted in a |
| * number of contexts in Linux (blk, bio, genhd), but the default is |
| * universally 512 bytes. These symbols are just slightly more |
| * meaningful than the bare numbers they represent. |
| */ |
| #define SECTOR_SHIFT 9 |
| #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) |
| |
| /* |
| * Increment the given counter and return its updated value. |
| * If the counter is already 0 it will not be incremented. |
| * If the counter is already at its maximum value returns |
| * -EINVAL without updating it. |
| */ |
| static int atomic_inc_return_safe(atomic_t *v) |
| { |
| unsigned int counter; |
| |
| counter = (unsigned int)__atomic_add_unless(v, 1, 0); |
| if (counter <= (unsigned int)INT_MAX) |
| return (int)counter; |
| |
| atomic_dec(v); |
| |
| return -EINVAL; |
| } |
| |
| /* Decrement the counter. Return the resulting value, or -EINVAL */ |
| static int atomic_dec_return_safe(atomic_t *v) |
| { |
| int counter; |
| |
| counter = atomic_dec_return(v); |
| if (counter >= 0) |
| return counter; |
| |
| atomic_inc(v); |
| |
| return -EINVAL; |
| } |
| |
| #define RBD_DRV_NAME "rbd" |
| |
| #define RBD_MINORS_PER_MAJOR 256 |
| #define RBD_SINGLE_MAJOR_PART_SHIFT 4 |
| |
| #define RBD_MAX_PARENT_CHAIN_LEN 16 |
| |
| #define RBD_SNAP_DEV_NAME_PREFIX "snap_" |
| #define RBD_MAX_SNAP_NAME_LEN \ |
| (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) |
| |
| #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ |
| |
| #define RBD_SNAP_HEAD_NAME "-" |
| |
| #define BAD_SNAP_INDEX U32_MAX /* invalid index into snap array */ |
| |
| /* This allows a single page to hold an image name sent by OSD */ |
| #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) |
| #define RBD_IMAGE_ID_LEN_MAX 64 |
| |
| #define RBD_OBJ_PREFIX_LEN_MAX 64 |
| |
| #define RBD_NOTIFY_TIMEOUT 5 /* seconds */ |
| #define RBD_RETRY_DELAY msecs_to_jiffies(1000) |
| |
| /* Feature bits */ |
| |
| #define RBD_FEATURE_LAYERING (1ULL<<0) |
| #define RBD_FEATURE_STRIPINGV2 (1ULL<<1) |
| #define RBD_FEATURE_EXCLUSIVE_LOCK (1ULL<<2) |
| #define RBD_FEATURE_DATA_POOL (1ULL<<7) |
| |
| #define RBD_FEATURES_ALL (RBD_FEATURE_LAYERING | \ |
| RBD_FEATURE_STRIPINGV2 | \ |
| RBD_FEATURE_EXCLUSIVE_LOCK | \ |
| RBD_FEATURE_DATA_POOL) |
| |
| /* Features supported by this (client software) implementation. */ |
| |
| #define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL) |
| |
| /* |
| * An RBD device name will be "rbd#", where the "rbd" comes from |
| * RBD_DRV_NAME above, and # is a unique integer identifier. |
| */ |
| #define DEV_NAME_LEN 32 |
| |
| /* |
| * block device image metadata (in-memory version) |
| */ |
| struct rbd_image_header { |
| /* These six fields never change for a given rbd image */ |
| char *object_prefix; |
| __u8 obj_order; |
| u64 stripe_unit; |
| u64 stripe_count; |
| s64 data_pool_id; |
| u64 features; /* Might be changeable someday? */ |
| |
| /* The remaining fields need to be updated occasionally */ |
| u64 image_size; |
| struct ceph_snap_context *snapc; |
| char *snap_names; /* format 1 only */ |
| u64 *snap_sizes; /* format 1 only */ |
| }; |
| |
| /* |
| * An rbd image specification. |
| * |
| * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely |
| * identify an image. Each rbd_dev structure includes a pointer to |
| * an rbd_spec structure that encapsulates this identity. |
| * |
| * Each of the id's in an rbd_spec has an associated name. For a |
| * user-mapped image, the names are supplied and the id's associated |
| * with them are looked up. For a layered image, a parent image is |
| * defined by the tuple, and the names are looked up. |
| * |
| * An rbd_dev structure contains a parent_spec pointer which is |
| * non-null if the image it represents is a child in a layered |
| * image. This pointer will refer to the rbd_spec structure used |
| * by the parent rbd_dev for its own identity (i.e., the structure |
| * is shared between the parent and child). |
| * |
| * Since these structures are populated once, during the discovery |
| * phase of image construction, they are effectively immutable so |
| * we make no effort to synchronize access to them. |
| * |
| * Note that code herein does not assume the image name is known (it |
| * could be a null pointer). |
| */ |
| struct rbd_spec { |
| u64 pool_id; |
| const char *pool_name; |
| |
| const char *image_id; |
| const char *image_name; |
| |
| u64 snap_id; |
| const char *snap_name; |
| |
| struct kref kref; |
| }; |
| |
| /* |
| * an instance of the client. multiple devices may share an rbd client. |
| */ |
| struct rbd_client { |
| struct ceph_client *client; |
| struct kref kref; |
| struct list_head node; |
| }; |
| |
| struct rbd_img_request; |
| typedef void (*rbd_img_callback_t)(struct rbd_img_request *); |
| |
| #define BAD_WHICH U32_MAX /* Good which or bad which, which? */ |
| |
| struct rbd_obj_request; |
| typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *); |
| |
| enum obj_request_type { |
| OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES |
| }; |
| |
| enum obj_operation_type { |
| OBJ_OP_WRITE, |
| OBJ_OP_READ, |
| OBJ_OP_DISCARD, |
| }; |
| |
| enum obj_req_flags { |
| OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ |
| OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ |
| OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ |
| OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ |
| }; |
| |
| struct rbd_obj_request { |
| u64 object_no; |
| u64 offset; /* object start byte */ |
| u64 length; /* bytes from offset */ |
| unsigned long flags; |
| |
| /* |
| * An object request associated with an image will have its |
| * img_data flag set; a standalone object request will not. |
| * |
| * A standalone object request will have which == BAD_WHICH |
| * and a null obj_request pointer. |
| * |
| * An object request initiated in support of a layered image |
| * object (to check for its existence before a write) will |
| * have which == BAD_WHICH and a non-null obj_request pointer. |
| * |
| * Finally, an object request for rbd image data will have |
| * which != BAD_WHICH, and will have a non-null img_request |
| * pointer. The value of which will be in the range |
| * 0..(img_request->obj_request_count-1). |
| */ |
| union { |
| struct rbd_obj_request *obj_request; /* STAT op */ |
| struct { |
| struct rbd_img_request *img_request; |
| u64 img_offset; |
| /* links for img_request->obj_requests list */ |
| struct list_head links; |
| }; |
| }; |
| u32 which; /* posn image request list */ |
| |
| enum obj_request_type type; |
| union { |
| struct bio *bio_list; |
| struct { |
| struct page **pages; |
| u32 page_count; |
| }; |
| }; |
| struct page **copyup_pages; |
| u32 copyup_page_count; |
| |
| struct ceph_osd_request *osd_req; |
| |
| u64 xferred; /* bytes transferred */ |
| int result; |
| |
| rbd_obj_callback_t callback; |
| struct completion completion; |
| |
| struct kref kref; |
| }; |
| |
| enum img_req_flags { |
| IMG_REQ_WRITE, /* I/O direction: read = 0, write = 1 */ |
| IMG_REQ_CHILD, /* initiator: block = 0, child image = 1 */ |
| IMG_REQ_LAYERED, /* ENOENT handling: normal = 0, layered = 1 */ |
| IMG_REQ_DISCARD, /* discard: normal = 0, discard request = 1 */ |
| }; |
| |
| struct rbd_img_request { |
| struct rbd_device *rbd_dev; |
| u64 offset; /* starting image byte offset */ |
| u64 length; /* byte count from offset */ |
| unsigned long flags; |
| union { |
| u64 snap_id; /* for reads */ |
| struct ceph_snap_context *snapc; /* for writes */ |
| }; |
| union { |
| struct request *rq; /* block request */ |
| struct rbd_obj_request *obj_request; /* obj req initiator */ |
| }; |
| struct page **copyup_pages; |
| u32 copyup_page_count; |
| spinlock_t completion_lock;/* protects next_completion */ |
| u32 next_completion; |
| rbd_img_callback_t callback; |
| u64 xferred;/* aggregate bytes transferred */ |
| int result; /* first nonzero obj_request result */ |
| |
| u32 obj_request_count; |
| struct list_head obj_requests; /* rbd_obj_request structs */ |
| |
| struct kref kref; |
| }; |
| |
| #define for_each_obj_request(ireq, oreq) \ |
| list_for_each_entry(oreq, &(ireq)->obj_requests, links) |
| #define for_each_obj_request_from(ireq, oreq) \ |
| list_for_each_entry_from(oreq, &(ireq)->obj_requests, links) |
| #define for_each_obj_request_safe(ireq, oreq, n) \ |
| list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links) |
| |
| enum rbd_watch_state { |
| RBD_WATCH_STATE_UNREGISTERED, |
| RBD_WATCH_STATE_REGISTERED, |
| RBD_WATCH_STATE_ERROR, |
| }; |
| |
| enum rbd_lock_state { |
| RBD_LOCK_STATE_UNLOCKED, |
| RBD_LOCK_STATE_LOCKED, |
| RBD_LOCK_STATE_RELEASING, |
| }; |
| |
| /* WatchNotify::ClientId */ |
| struct rbd_client_id { |
| u64 gid; |
| u64 handle; |
| }; |
| |
| struct rbd_mapping { |
| u64 size; |
| u64 features; |
| bool read_only; |
| }; |
| |
| /* |
| * a single device |
| */ |
| struct rbd_device { |
| int dev_id; /* blkdev unique id */ |
| |
| int major; /* blkdev assigned major */ |
| int minor; |
| struct gendisk *disk; /* blkdev's gendisk and rq */ |
| |
| u32 image_format; /* Either 1 or 2 */ |
| struct rbd_client *rbd_client; |
| |
| char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ |
| |
| spinlock_t lock; /* queue, flags, open_count */ |
| |
| struct rbd_image_header header; |
| unsigned long flags; /* possibly lock protected */ |
| struct rbd_spec *spec; |
| struct rbd_options *opts; |
| char *config_info; /* add{,_single_major} string */ |
| |
| struct ceph_object_id header_oid; |
| struct ceph_object_locator header_oloc; |
| |
| struct ceph_file_layout layout; /* used for all rbd requests */ |
| |
| struct mutex watch_mutex; |
| enum rbd_watch_state watch_state; |
| struct ceph_osd_linger_request *watch_handle; |
| u64 watch_cookie; |
| struct delayed_work watch_dwork; |
| |
| struct rw_semaphore lock_rwsem; |
| enum rbd_lock_state lock_state; |
| char lock_cookie[32]; |
| struct rbd_client_id owner_cid; |
| struct work_struct acquired_lock_work; |
| struct work_struct released_lock_work; |
| struct delayed_work lock_dwork; |
| struct work_struct unlock_work; |
| wait_queue_head_t lock_waitq; |
| |
| struct workqueue_struct *task_wq; |
| |
| struct rbd_spec *parent_spec; |
| u64 parent_overlap; |
| atomic_t parent_ref; |
| struct rbd_device *parent; |
| |
| /* Block layer tags. */ |
| struct blk_mq_tag_set tag_set; |
| |
| /* protects updating the header */ |
| struct rw_semaphore header_rwsem; |
| |
| struct rbd_mapping mapping; |
| |
| struct list_head node; |
| |
| /* sysfs related */ |
| struct device dev; |
| unsigned long open_count; /* protected by lock */ |
| }; |
| |
| /* |
| * Flag bits for rbd_dev->flags: |
| * - REMOVING (which is coupled with rbd_dev->open_count) is protected |
| * by rbd_dev->lock |
| * - BLACKLISTED is protected by rbd_dev->lock_rwsem |
| */ |
| enum rbd_dev_flags { |
| RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ |
| RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
| RBD_DEV_FLAG_BLACKLISTED, /* our ceph_client is blacklisted */ |
| }; |
| |
| static DEFINE_MUTEX(client_mutex); /* Serialize client creation */ |
| |
| static LIST_HEAD(rbd_dev_list); /* devices */ |
| static DEFINE_SPINLOCK(rbd_dev_list_lock); |
| |
| static LIST_HEAD(rbd_client_list); /* clients */ |
| static DEFINE_SPINLOCK(rbd_client_list_lock); |
| |
| /* Slab caches for frequently-allocated structures */ |
| |
| static struct kmem_cache *rbd_img_request_cache; |
| static struct kmem_cache *rbd_obj_request_cache; |
| |
| static struct bio_set *rbd_bio_clone; |
| |
| static int rbd_major; |
| static DEFINE_IDA(rbd_dev_id_ida); |
| |
| static struct workqueue_struct *rbd_wq; |
| |
| /* |
| * Default to false for now, as single-major requires >= 0.75 version of |
| * userspace rbd utility. |
| */ |
| static bool single_major = false; |
| module_param(single_major, bool, S_IRUGO); |
| MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: false)"); |
| |
| static int rbd_img_request_submit(struct rbd_img_request *img_request); |
| |
| static ssize_t rbd_add(struct bus_type *bus, const char *buf, |
| size_t count); |
| static ssize_t rbd_remove(struct bus_type *bus, const char *buf, |
| size_t count); |
| static ssize_t rbd_add_single_major(struct bus_type *bus, const char *buf, |
| size_t count); |
| static ssize_t rbd_remove_single_major(struct bus_type *bus, const char *buf, |
| size_t count); |
| static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth); |
| static void rbd_spec_put(struct rbd_spec *spec); |
| |
| static int rbd_dev_id_to_minor(int dev_id) |
| { |
| return dev_id << RBD_SINGLE_MAJOR_PART_SHIFT; |
| } |
| |
| static int minor_to_rbd_dev_id(int minor) |
| { |
| return minor >> RBD_SINGLE_MAJOR_PART_SHIFT; |
| } |
| |
| static bool __rbd_is_lock_owner(struct rbd_device *rbd_dev) |
| { |
| return rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED || |
| rbd_dev->lock_state == RBD_LOCK_STATE_RELEASING; |
| } |
| |
| static bool rbd_is_lock_owner(struct rbd_device *rbd_dev) |
| { |
| bool is_lock_owner; |
| |
| down_read(&rbd_dev->lock_rwsem); |
| is_lock_owner = __rbd_is_lock_owner(rbd_dev); |
| up_read(&rbd_dev->lock_rwsem); |
| return is_lock_owner; |
| } |
| |
| static ssize_t rbd_supported_features_show(struct bus_type *bus, char *buf) |
| { |
| return sprintf(buf, "0x%llx\n", RBD_FEATURES_SUPPORTED); |
| } |
| |
| static BUS_ATTR(add, S_IWUSR, NULL, rbd_add); |
| static BUS_ATTR(remove, S_IWUSR, NULL, rbd_remove); |
| static BUS_ATTR(add_single_major, S_IWUSR, NULL, rbd_add_single_major); |
| static BUS_ATTR(remove_single_major, S_IWUSR, NULL, rbd_remove_single_major); |
| static BUS_ATTR(supported_features, S_IRUGO, rbd_supported_features_show, NULL); |
| |
| static struct attribute *rbd_bus_attrs[] = { |
| &bus_attr_add.attr, |
| &bus_attr_remove.attr, |
| &bus_attr_add_single_major.attr, |
| &bus_attr_remove_single_major.attr, |
| &bus_attr_supported_features.attr, |
| NULL, |
| }; |
| |
| static umode_t rbd_bus_is_visible(struct kobject *kobj, |
| struct attribute *attr, int index) |
| { |
| if (!single_major && |
| (attr == &bus_attr_add_single_major.attr || |
| attr == &bus_attr_remove_single_major.attr)) |
| return 0; |
| |
| return attr->mode; |
| } |
| |
| static const struct attribute_group rbd_bus_group = { |
| .attrs = rbd_bus_attrs, |
| .is_visible = rbd_bus_is_visible, |
| }; |
| __ATTRIBUTE_GROUPS(rbd_bus); |
| |
| static struct bus_type rbd_bus_type = { |
| .name = "rbd", |
| .bus_groups = rbd_bus_groups, |
| }; |
| |
| static void rbd_root_dev_release(struct device *dev) |
| { |
| } |
| |
| static struct device rbd_root_dev = { |
| .init_name = "rbd", |
| .release = rbd_root_dev_release, |
| }; |
| |
| static __printf(2, 3) |
| void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) |
| { |
| struct va_format vaf; |
| va_list args; |
| |
| va_start(args, fmt); |
| vaf.fmt = fmt; |
| vaf.va = &args; |
| |
| if (!rbd_dev) |
| printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); |
| else if (rbd_dev->disk) |
| printk(KERN_WARNING "%s: %s: %pV\n", |
| RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); |
| else if (rbd_dev->spec && rbd_dev->spec->image_name) |
| printk(KERN_WARNING "%s: image %s: %pV\n", |
| RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); |
| else if (rbd_dev->spec && rbd_dev->spec->image_id) |
| printk(KERN_WARNING "%s: id %s: %pV\n", |
| RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); |
| else /* punt */ |
| printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", |
| RBD_DRV_NAME, rbd_dev, &vaf); |
| va_end(args); |
| } |
| |
| #ifdef RBD_DEBUG |
| #define rbd_assert(expr) \ |
| if (unlikely(!(expr))) { \ |
| printk(KERN_ERR "\nAssertion failure in %s() " \ |
| "at line %d:\n\n" \ |
| "\trbd_assert(%s);\n\n", \ |
| __func__, __LINE__, #expr); \ |
| BUG(); \ |
| } |
| #else /* !RBD_DEBUG */ |
| # define rbd_assert(expr) ((void) 0) |
| #endif /* !RBD_DEBUG */ |
| |
| static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); |
| static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); |
| static void rbd_img_parent_read(struct rbd_obj_request *obj_request); |
| static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); |
| |
| static int rbd_dev_refresh(struct rbd_device *rbd_dev); |
| static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev); |
| static int rbd_dev_header_info(struct rbd_device *rbd_dev); |
| static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev); |
| static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| u64 snap_id); |
| static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| u8 *order, u64 *snap_size); |
| static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| u64 *snap_features); |
| |
| static int rbd_open(struct block_device *bdev, fmode_t mode) |
| { |
| struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
| bool removing = false; |
| |
| if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) |
| return -EROFS; |
| |
| spin_lock_irq(&rbd_dev->lock); |
| if (test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) |
| removing = true; |
| else |
| rbd_dev->open_count++; |
| spin_unlock_irq(&rbd_dev->lock); |
| if (removing) |
| return -ENOENT; |
| |
| (void) get_device(&rbd_dev->dev); |
| |
| return 0; |
| } |
| |
| static void rbd_release(struct gendisk *disk, fmode_t mode) |
| { |
| struct rbd_device *rbd_dev = disk->private_data; |
| unsigned long open_count_before; |
| |
| spin_lock_irq(&rbd_dev->lock); |
| open_count_before = rbd_dev->open_count--; |
| spin_unlock_irq(&rbd_dev->lock); |
| rbd_assert(open_count_before > 0); |
| |
| put_device(&rbd_dev->dev); |
| } |
| |
| static int rbd_ioctl_set_ro(struct rbd_device *rbd_dev, unsigned long arg) |
| { |
| int ret = 0; |
| int val; |
| bool ro; |
| bool ro_changed = false; |
| |
| /* get_user() may sleep, so call it before taking rbd_dev->lock */ |
| if (get_user(val, (int __user *)(arg))) |
| return -EFAULT; |
| |
| ro = val ? true : false; |
| /* Snapshot doesn't allow to write*/ |
| if (rbd_dev->spec->snap_id != CEPH_NOSNAP && !ro) |
| return -EROFS; |
| |
| spin_lock_irq(&rbd_dev->lock); |
| /* prevent others open this device */ |
| if (rbd_dev->open_count > 1) { |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| if (rbd_dev->mapping.read_only != ro) { |
| rbd_dev->mapping.read_only = ro; |
| ro_changed = true; |
| } |
| |
| out: |
| spin_unlock_irq(&rbd_dev->lock); |
| /* set_disk_ro() may sleep, so call it after releasing rbd_dev->lock */ |
| if (ret == 0 && ro_changed) |
| set_disk_ro(rbd_dev->disk, ro ? 1 : 0); |
| |
| return ret; |
| } |
| |
| static int rbd_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| struct rbd_device *rbd_dev = bdev->bd_disk->private_data; |
| int ret = 0; |
| |
| switch (cmd) { |
| case BLKROSET: |
| ret = rbd_ioctl_set_ro(rbd_dev, arg); |
| break; |
| default: |
| ret = -ENOTTY; |
| } |
| |
| return ret; |
| } |
| |
| #ifdef CONFIG_COMPAT |
| static int rbd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
| unsigned int cmd, unsigned long arg) |
| { |
| return rbd_ioctl(bdev, mode, cmd, arg); |
| } |
| #endif /* CONFIG_COMPAT */ |
| |
| static const struct block_device_operations rbd_bd_ops = { |
| .owner = THIS_MODULE, |
| .open = rbd_open, |
| .release = rbd_release, |
| .ioctl = rbd_ioctl, |
| #ifdef CONFIG_COMPAT |
| .compat_ioctl = rbd_compat_ioctl, |
| #endif |
| }; |
| |
| /* |
| * Initialize an rbd client instance. Success or not, this function |
| * consumes ceph_opts. Caller holds client_mutex. |
| */ |
| static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
| { |
| struct rbd_client *rbdc; |
| int ret = -ENOMEM; |
| |
| dout("%s:\n", __func__); |
| rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| if (!rbdc) |
| goto out_opt; |
| |
| kref_init(&rbdc->kref); |
| INIT_LIST_HEAD(&rbdc->node); |
| |
| rbdc->client = ceph_create_client(ceph_opts, rbdc); |
| if (IS_ERR(rbdc->client)) |
| goto out_rbdc; |
| ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
| |
| ret = ceph_open_session(rbdc->client); |
| if (ret < 0) |
| goto out_client; |
| |
| spin_lock(&rbd_client_list_lock); |
| list_add_tail(&rbdc->node, &rbd_client_list); |
| spin_unlock(&rbd_client_list_lock); |
| |
| dout("%s: rbdc %p\n", __func__, rbdc); |
| |
| return rbdc; |
| out_client: |
| ceph_destroy_client(rbdc->client); |
| out_rbdc: |
| kfree(rbdc); |
| out_opt: |
| if (ceph_opts) |
| ceph_destroy_options(ceph_opts); |
| dout("%s: error %d\n", __func__, ret); |
| |
| return ERR_PTR(ret); |
| } |
| |
| static struct rbd_client *__rbd_get_client(struct rbd_client *rbdc) |
| { |
| kref_get(&rbdc->kref); |
| |
| return rbdc; |
| } |
| |
| /* |
| * Find a ceph client with specific addr and configuration. If |
| * found, bump its reference count. |
| */ |
| static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) |
| { |
| struct rbd_client *client_node; |
| bool found = false; |
| |
| if (ceph_opts->flags & CEPH_OPT_NOSHARE) |
| return NULL; |
| |
| spin_lock(&rbd_client_list_lock); |
| list_for_each_entry(client_node, &rbd_client_list, node) { |
| if (!ceph_compare_options(ceph_opts, client_node->client)) { |
| __rbd_get_client(client_node); |
| |
| found = true; |
| break; |
| } |
| } |
| spin_unlock(&rbd_client_list_lock); |
| |
| return found ? client_node : NULL; |
| } |
| |
| /* |
| * (Per device) rbd map options |
| */ |
| enum { |
| Opt_queue_depth, |
| Opt_last_int, |
| /* int args above */ |
| Opt_last_string, |
| /* string args above */ |
| Opt_read_only, |
| Opt_read_write, |
| Opt_lock_on_read, |
| Opt_exclusive, |
| Opt_err |
| }; |
| |
| static match_table_t rbd_opts_tokens = { |
| {Opt_queue_depth, "queue_depth=%d"}, |
| /* int args above */ |
| /* string args above */ |
| {Opt_read_only, "read_only"}, |
| {Opt_read_only, "ro"}, /* Alternate spelling */ |
| {Opt_read_write, "read_write"}, |
| {Opt_read_write, "rw"}, /* Alternate spelling */ |
| {Opt_lock_on_read, "lock_on_read"}, |
| {Opt_exclusive, "exclusive"}, |
| {Opt_err, NULL} |
| }; |
| |
| struct rbd_options { |
| int queue_depth; |
| bool read_only; |
| bool lock_on_read; |
| bool exclusive; |
| }; |
| |
| #define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ |
| #define RBD_READ_ONLY_DEFAULT false |
| #define RBD_LOCK_ON_READ_DEFAULT false |
| #define RBD_EXCLUSIVE_DEFAULT false |
| |
| static int parse_rbd_opts_token(char *c, void *private) |
| { |
| struct rbd_options *rbd_opts = private; |
| substring_t argstr[MAX_OPT_ARGS]; |
| int token, intval, ret; |
| |
| token = match_token(c, rbd_opts_tokens, argstr); |
| if (token < Opt_last_int) { |
| ret = match_int(&argstr[0], &intval); |
| if (ret < 0) { |
| pr_err("bad mount option arg (not int) at '%s'\n", c); |
| return ret; |
| } |
| dout("got int token %d val %d\n", token, intval); |
| } else if (token > Opt_last_int && token < Opt_last_string) { |
| dout("got string token %d val %s\n", token, argstr[0].from); |
| } else { |
| dout("got token %d\n", token); |
| } |
| |
| switch (token) { |
| case Opt_queue_depth: |
| if (intval < 1) { |
| pr_err("queue_depth out of range\n"); |
| return -EINVAL; |
| } |
| rbd_opts->queue_depth = intval; |
| break; |
| case Opt_read_only: |
| rbd_opts->read_only = true; |
| break; |
| case Opt_read_write: |
| rbd_opts->read_only = false; |
| break; |
| case Opt_lock_on_read: |
| rbd_opts->lock_on_read = true; |
| break; |
| case Opt_exclusive: |
| rbd_opts->exclusive = true; |
| break; |
| default: |
| /* libceph prints "bad option" msg */ |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static char* obj_op_name(enum obj_operation_type op_type) |
| { |
| switch (op_type) { |
| case OBJ_OP_READ: |
| return "read"; |
| case OBJ_OP_WRITE: |
| return "write"; |
| case OBJ_OP_DISCARD: |
| return "discard"; |
| default: |
| return "???"; |
| } |
| } |
| |
| /* |
| * Get a ceph client with specific addr and configuration, if one does |
| * not exist create it. Either way, ceph_opts is consumed by this |
| * function. |
| */ |
| static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
| { |
| struct rbd_client *rbdc; |
| |
| mutex_lock_nested(&client_mutex, SINGLE_DEPTH_NESTING); |
| rbdc = rbd_client_find(ceph_opts); |
| if (rbdc) /* using an existing client */ |
| ceph_destroy_options(ceph_opts); |
| else |
| rbdc = rbd_client_create(ceph_opts); |
| mutex_unlock(&client_mutex); |
| |
| return rbdc; |
| } |
| |
| /* |
| * Destroy ceph client |
| * |
| * Caller must hold rbd_client_list_lock. |
| */ |
| static void rbd_client_release(struct kref *kref) |
| { |
| struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); |
| |
| dout("%s: rbdc %p\n", __func__, rbdc); |
| spin_lock(&rbd_client_list_lock); |
| list_del(&rbdc->node); |
| spin_unlock(&rbd_client_list_lock); |
| |
| ceph_destroy_client(rbdc->client); |
| kfree(rbdc); |
| } |
| |
| /* |
| * Drop reference to ceph client node. If it's not referenced anymore, release |
| * it. |
| */ |
| static void rbd_put_client(struct rbd_client *rbdc) |
| { |
| if (rbdc) |
| kref_put(&rbdc->kref, rbd_client_release); |
| } |
| |
| static bool rbd_image_format_valid(u32 image_format) |
| { |
| return image_format == 1 || image_format == 2; |
| } |
| |
| static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) |
| { |
| size_t size; |
| u32 snap_count; |
| |
| /* The header has to start with the magic rbd header text */ |
| if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) |
| return false; |
| |
| /* The bio layer requires at least sector-sized I/O */ |
| |
| if (ondisk->options.order < SECTOR_SHIFT) |
| return false; |
| |
| /* If we use u64 in a few spots we may be able to loosen this */ |
| |
| if (ondisk->options.order > 8 * sizeof (int) - 1) |
| return false; |
| |
| /* |
| * The size of a snapshot header has to fit in a size_t, and |
| * that limits the number of snapshots. |
| */ |
| snap_count = le32_to_cpu(ondisk->snap_count); |
| size = SIZE_MAX - sizeof (struct ceph_snap_context); |
| if (snap_count > size / sizeof (__le64)) |
| return false; |
| |
| /* |
| * Not only that, but the size of the entire the snapshot |
| * header must also be representable in a size_t. |
| */ |
| size -= snap_count * sizeof (__le64); |
| if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) |
| return false; |
| |
| return true; |
| } |
| |
| /* |
| * returns the size of an object in the image |
| */ |
| static u32 rbd_obj_bytes(struct rbd_image_header *header) |
| { |
| return 1U << header->obj_order; |
| } |
| |
| static void rbd_init_layout(struct rbd_device *rbd_dev) |
| { |
| if (rbd_dev->header.stripe_unit == 0 || |
| rbd_dev->header.stripe_count == 0) { |
| rbd_dev->header.stripe_unit = rbd_obj_bytes(&rbd_dev->header); |
| rbd_dev->header.stripe_count = 1; |
| } |
| |
| rbd_dev->layout.stripe_unit = rbd_dev->header.stripe_unit; |
| rbd_dev->layout.stripe_count = rbd_dev->header.stripe_count; |
| rbd_dev->layout.object_size = rbd_obj_bytes(&rbd_dev->header); |
| rbd_dev->layout.pool_id = rbd_dev->header.data_pool_id == CEPH_NOPOOL ? |
| rbd_dev->spec->pool_id : rbd_dev->header.data_pool_id; |
| RCU_INIT_POINTER(rbd_dev->layout.pool_ns, NULL); |
| } |
| |
| /* |
| * Fill an rbd image header with information from the given format 1 |
| * on-disk header. |
| */ |
| static int rbd_header_from_disk(struct rbd_device *rbd_dev, |
| struct rbd_image_header_ondisk *ondisk) |
| { |
| struct rbd_image_header *header = &rbd_dev->header; |
| bool first_time = header->object_prefix == NULL; |
| struct ceph_snap_context *snapc; |
| char *object_prefix = NULL; |
| char *snap_names = NULL; |
| u64 *snap_sizes = NULL; |
| u32 snap_count; |
| int ret = -ENOMEM; |
| u32 i; |
| |
| /* Allocate this now to avoid having to handle failure below */ |
| |
| if (first_time) { |
| object_prefix = kstrndup(ondisk->object_prefix, |
| sizeof(ondisk->object_prefix), |
| GFP_KERNEL); |
| if (!object_prefix) |
| return -ENOMEM; |
| } |
| |
| /* Allocate the snapshot context and fill it in */ |
| |
| snap_count = le32_to_cpu(ondisk->snap_count); |
| snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
| if (!snapc) |
| goto out_err; |
| snapc->seq = le64_to_cpu(ondisk->snap_seq); |
| if (snap_count) { |
| struct rbd_image_snap_ondisk *snaps; |
| u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
| |
| /* We'll keep a copy of the snapshot names... */ |
| |
| if (snap_names_len > (u64)SIZE_MAX) |
| goto out_2big; |
| snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
| if (!snap_names) |
| goto out_err; |
| |
| /* ...as well as the array of their sizes. */ |
| snap_sizes = kmalloc_array(snap_count, |
| sizeof(*header->snap_sizes), |
| GFP_KERNEL); |
| if (!snap_sizes) |
| goto out_err; |
| |
| /* |
| * Copy the names, and fill in each snapshot's id |
| * and size. |
| * |
| * Note that rbd_dev_v1_header_info() guarantees the |
| * ondisk buffer we're working with has |
| * snap_names_len bytes beyond the end of the |
| * snapshot id array, this memcpy() is safe. |
| */ |
| memcpy(snap_names, &ondisk->snaps[snap_count], snap_names_len); |
| snaps = ondisk->snaps; |
| for (i = 0; i < snap_count; i++) { |
| snapc->snaps[i] = le64_to_cpu(snaps[i].id); |
| snap_sizes[i] = le64_to_cpu(snaps[i].image_size); |
| } |
| } |
| |
| /* We won't fail any more, fill in the header */ |
| |
| if (first_time) { |
| header->object_prefix = object_prefix; |
| header->obj_order = ondisk->options.order; |
| rbd_init_layout(rbd_dev); |
| } else { |
| ceph_put_snap_context(header->snapc); |
| kfree(header->snap_names); |
| kfree(header->snap_sizes); |
| } |
| |
| /* The remaining fields always get updated (when we refresh) */ |
| |
| header->image_size = le64_to_cpu(ondisk->image_size); |
| header->snapc = snapc; |
| header->snap_names = snap_names; |
| header->snap_sizes = snap_sizes; |
| |
| return 0; |
| out_2big: |
| ret = -EIO; |
| out_err: |
| kfree(snap_sizes); |
| kfree(snap_names); |
| ceph_put_snap_context(snapc); |
| kfree(object_prefix); |
| |
| return ret; |
| } |
| |
| static const char *_rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, u32 which) |
| { |
| const char *snap_name; |
| |
| rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
| |
| /* Skip over names until we find the one we are looking for */ |
| |
| snap_name = rbd_dev->header.snap_names; |
| while (which--) |
| snap_name += strlen(snap_name) + 1; |
| |
| return kstrdup(snap_name, GFP_KERNEL); |
| } |
| |
| /* |
| * Snapshot id comparison function for use with qsort()/bsearch(). |
| * Note that result is for snapshots in *descending* order. |
| */ |
| static int snapid_compare_reverse(const void *s1, const void *s2) |
| { |
| u64 snap_id1 = *(u64 *)s1; |
| u64 snap_id2 = *(u64 *)s2; |
| |
| if (snap_id1 < snap_id2) |
| return 1; |
| return snap_id1 == snap_id2 ? 0 : -1; |
| } |
| |
| /* |
| * Search a snapshot context to see if the given snapshot id is |
| * present. |
| * |
| * Returns the position of the snapshot id in the array if it's found, |
| * or BAD_SNAP_INDEX otherwise. |
| * |
| * Note: The snapshot array is in kept sorted (by the osd) in |
| * reverse order, highest snapshot id first. |
| */ |
| static u32 rbd_dev_snap_index(struct rbd_device *rbd_dev, u64 snap_id) |
| { |
| struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| u64 *found; |
| |
| found = bsearch(&snap_id, &snapc->snaps, snapc->num_snaps, |
| sizeof (snap_id), snapid_compare_reverse); |
| |
| return found ? (u32)(found - &snapc->snaps[0]) : BAD_SNAP_INDEX; |
| } |
| |
| static const char *rbd_dev_v1_snap_name(struct rbd_device *rbd_dev, |
| u64 snap_id) |
| { |
| u32 which; |
| const char *snap_name; |
| |
| which = rbd_dev_snap_index(rbd_dev, snap_id); |
| if (which == BAD_SNAP_INDEX) |
| return ERR_PTR(-ENOENT); |
| |
| snap_name = _rbd_dev_v1_snap_name(rbd_dev, which); |
| return snap_name ? snap_name : ERR_PTR(-ENOMEM); |
| } |
| |
| static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
| { |
| if (snap_id == CEPH_NOSNAP) |
| return RBD_SNAP_HEAD_NAME; |
| |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| if (rbd_dev->image_format == 1) |
| return rbd_dev_v1_snap_name(rbd_dev, snap_id); |
| |
| return rbd_dev_v2_snap_name(rbd_dev, snap_id); |
| } |
| |
| static int rbd_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| u64 *snap_size) |
| { |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| if (snap_id == CEPH_NOSNAP) { |
| *snap_size = rbd_dev->header.image_size; |
| } else if (rbd_dev->image_format == 1) { |
| u32 which; |
| |
| which = rbd_dev_snap_index(rbd_dev, snap_id); |
| if (which == BAD_SNAP_INDEX) |
| return -ENOENT; |
| |
| *snap_size = rbd_dev->header.snap_sizes[which]; |
| } else { |
| u64 size = 0; |
| int ret; |
| |
| ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, NULL, &size); |
| if (ret) |
| return ret; |
| |
| *snap_size = size; |
| } |
| return 0; |
| } |
| |
| static int rbd_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| u64 *snap_features) |
| { |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| if (snap_id == CEPH_NOSNAP) { |
| *snap_features = rbd_dev->header.features; |
| } else if (rbd_dev->image_format == 1) { |
| *snap_features = 0; /* No features for format 1 */ |
| } else { |
| u64 features = 0; |
| int ret; |
| |
| ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, &features); |
| if (ret) |
| return ret; |
| |
| *snap_features = features; |
| } |
| return 0; |
| } |
| |
| static int rbd_dev_mapping_set(struct rbd_device *rbd_dev) |
| { |
| u64 snap_id = rbd_dev->spec->snap_id; |
| u64 size = 0; |
| u64 features = 0; |
| int ret; |
| |
| ret = rbd_snap_size(rbd_dev, snap_id, &size); |
| if (ret) |
| return ret; |
| ret = rbd_snap_features(rbd_dev, snap_id, &features); |
| if (ret) |
| return ret; |
| |
| rbd_dev->mapping.size = size; |
| rbd_dev->mapping.features = features; |
| |
| return 0; |
| } |
| |
| static void rbd_dev_mapping_clear(struct rbd_device *rbd_dev) |
| { |
| rbd_dev->mapping.size = 0; |
| rbd_dev->mapping.features = 0; |
| } |
| |
| static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
| { |
| u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
| |
| return offset & (segment_size - 1); |
| } |
| |
| static u64 rbd_segment_length(struct rbd_device *rbd_dev, |
| u64 offset, u64 length) |
| { |
| u64 segment_size = rbd_obj_bytes(&rbd_dev->header); |
| |
| offset &= segment_size - 1; |
| |
| rbd_assert(length <= U64_MAX - offset); |
| if (offset + length > segment_size) |
| length = segment_size - offset; |
| |
| return length; |
| } |
| |
| /* |
| * bio helpers |
| */ |
| |
| static void bio_chain_put(struct bio *chain) |
| { |
| struct bio *tmp; |
| |
| while (chain) { |
| tmp = chain; |
| chain = chain->bi_next; |
| bio_put(tmp); |
| } |
| } |
| |
| /* |
| * zeros a bio chain, starting at specific offset |
| */ |
| static void zero_bio_chain(struct bio *chain, int start_ofs) |
| { |
| struct bio_vec bv; |
| struct bvec_iter iter; |
| unsigned long flags; |
| void *buf; |
| int pos = 0; |
| |
| while (chain) { |
| bio_for_each_segment(bv, chain, iter) { |
| if (pos + bv.bv_len > start_ofs) { |
| int remainder = max(start_ofs - pos, 0); |
| buf = bvec_kmap_irq(&bv, &flags); |
| memset(buf + remainder, 0, |
| bv.bv_len - remainder); |
| flush_dcache_page(bv.bv_page); |
| bvec_kunmap_irq(buf, &flags); |
| } |
| pos += bv.bv_len; |
| } |
| |
| chain = chain->bi_next; |
| } |
| } |
| |
| /* |
| * similar to zero_bio_chain(), zeros data defined by a page array, |
| * starting at the given byte offset from the start of the array and |
| * continuing up to the given end offset. The pages array is |
| * assumed to be big enough to hold all bytes up to the end. |
| */ |
| static void zero_pages(struct page **pages, u64 offset, u64 end) |
| { |
| struct page **page = &pages[offset >> PAGE_SHIFT]; |
| |
| rbd_assert(end > offset); |
| rbd_assert(end - offset <= (u64)SIZE_MAX); |
| while (offset < end) { |
| size_t page_offset; |
| size_t length; |
| unsigned long flags; |
| void *kaddr; |
| |
| page_offset = offset & ~PAGE_MASK; |
| length = min_t(size_t, PAGE_SIZE - page_offset, end - offset); |
| local_irq_save(flags); |
| kaddr = kmap_atomic(*page); |
| memset(kaddr + page_offset, 0, length); |
| flush_dcache_page(*page); |
| kunmap_atomic(kaddr); |
| local_irq_restore(flags); |
| |
| offset += length; |
| page++; |
| } |
| } |
| |
| /* |
| * Clone a portion of a bio, starting at the given byte offset |
| * and continuing for the number of bytes indicated. |
| */ |
| static struct bio *bio_clone_range(struct bio *bio_src, |
| unsigned int offset, |
| unsigned int len, |
| gfp_t gfpmask) |
| { |
| struct bio *bio; |
| |
| bio = bio_clone_fast(bio_src, gfpmask, rbd_bio_clone); |
| if (!bio) |
| return NULL; /* ENOMEM */ |
| |
| bio_advance(bio, offset); |
| bio->bi_iter.bi_size = len; |
| |
| return bio; |
| } |
| |
| /* |
| * Clone a portion of a bio chain, starting at the given byte offset |
| * into the first bio in the source chain and continuing for the |
| * number of bytes indicated. The result is another bio chain of |
| * exactly the given length, or a null pointer on error. |
| * |
| * The bio_src and offset parameters are both in-out. On entry they |
| * refer to the first source bio and the offset into that bio where |
| * the start of data to be cloned is located. |
| * |
| * On return, bio_src is updated to refer to the bio in the source |
| * chain that contains first un-cloned byte, and *offset will |
| * contain the offset of that byte within that bio. |
| */ |
| static struct bio *bio_chain_clone_range(struct bio **bio_src, |
| unsigned int *offset, |
| unsigned int len, |
| gfp_t gfpmask) |
| { |
| struct bio *bi = *bio_src; |
| unsigned int off = *offset; |
| struct bio *chain = NULL; |
| struct bio **end; |
| |
| /* Build up a chain of clone bios up to the limit */ |
| |
| if (!bi || off >= bi->bi_iter.bi_size || !len) |
| return NULL; /* Nothing to clone */ |
| |
| end = &chain; |
| while (len) { |
| unsigned int bi_size; |
| struct bio *bio; |
| |
| if (!bi) { |
| rbd_warn(NULL, "bio_chain exhausted with %u left", len); |
| goto out_err; /* EINVAL; ran out of bio's */ |
| } |
| bi_size = min_t(unsigned int, bi->bi_iter.bi_size - off, len); |
| bio = bio_clone_range(bi, off, bi_size, gfpmask); |
| if (!bio) |
| goto out_err; /* ENOMEM */ |
| |
| *end = bio; |
| end = &bio->bi_next; |
| |
| off += bi_size; |
| if (off == bi->bi_iter.bi_size) { |
| bi = bi->bi_next; |
| off = 0; |
| } |
| len -= bi_size; |
| } |
| *bio_src = bi; |
| *offset = off; |
| |
| return chain; |
| out_err: |
| bio_chain_put(chain); |
| |
| return NULL; |
| } |
| |
| /* |
| * The default/initial value for all object request flags is 0. For |
| * each flag, once its value is set to 1 it is never reset to 0 |
| * again. |
| */ |
| static void obj_request_img_data_set(struct rbd_obj_request *obj_request) |
| { |
| if (test_and_set_bit(OBJ_REQ_IMG_DATA, &obj_request->flags)) { |
| struct rbd_device *rbd_dev; |
| |
| rbd_dev = obj_request->img_request->rbd_dev; |
| rbd_warn(rbd_dev, "obj_request %p already marked img_data", |
| obj_request); |
| } |
| } |
| |
| static bool obj_request_img_data_test(struct rbd_obj_request *obj_request) |
| { |
| smp_mb(); |
| return test_bit(OBJ_REQ_IMG_DATA, &obj_request->flags) != 0; |
| } |
| |
| static void obj_request_done_set(struct rbd_obj_request *obj_request) |
| { |
| if (test_and_set_bit(OBJ_REQ_DONE, &obj_request->flags)) { |
| struct rbd_device *rbd_dev = NULL; |
| |
| if (obj_request_img_data_test(obj_request)) |
| rbd_dev = obj_request->img_request->rbd_dev; |
| rbd_warn(rbd_dev, "obj_request %p already marked done", |
| obj_request); |
| } |
| } |
| |
| static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
| { |
| smp_mb(); |
| return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; |
| } |
| |
| /* |
| * This sets the KNOWN flag after (possibly) setting the EXISTS |
| * flag. The latter is set based on the "exists" value provided. |
| * |
| * Note that for our purposes once an object exists it never goes |
| * away again. It's possible that the response from two existence |
| * checks are separated by the creation of the target object, and |
| * the first ("doesn't exist") response arrives *after* the second |
| * ("does exist"). In that case we ignore the second one. |
| */ |
| static void obj_request_existence_set(struct rbd_obj_request *obj_request, |
| bool exists) |
| { |
| if (exists) |
| set_bit(OBJ_REQ_EXISTS, &obj_request->flags); |
| set_bit(OBJ_REQ_KNOWN, &obj_request->flags); |
| smp_mb(); |
| } |
| |
| static bool obj_request_known_test(struct rbd_obj_request *obj_request) |
| { |
| smp_mb(); |
| return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; |
| } |
| |
| static bool obj_request_exists_test(struct rbd_obj_request *obj_request) |
| { |
| smp_mb(); |
| return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; |
| } |
| |
| static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
| |
| return obj_request->img_offset < |
| round_up(rbd_dev->parent_overlap, rbd_obj_bytes(&rbd_dev->header)); |
| } |
| |
| static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p (was %d)\n", __func__, obj_request, |
| kref_read(&obj_request->kref)); |
| kref_get(&obj_request->kref); |
| } |
| |
| static void rbd_obj_request_destroy(struct kref *kref); |
| static void rbd_obj_request_put(struct rbd_obj_request *obj_request) |
| { |
| rbd_assert(obj_request != NULL); |
| dout("%s: obj %p (was %d)\n", __func__, obj_request, |
| kref_read(&obj_request->kref)); |
| kref_put(&obj_request->kref, rbd_obj_request_destroy); |
| } |
| |
| static void rbd_img_request_get(struct rbd_img_request *img_request) |
| { |
| dout("%s: img %p (was %d)\n", __func__, img_request, |
| kref_read(&img_request->kref)); |
| kref_get(&img_request->kref); |
| } |
| |
| static bool img_request_child_test(struct rbd_img_request *img_request); |
| static void rbd_parent_request_destroy(struct kref *kref); |
| static void rbd_img_request_destroy(struct kref *kref); |
| static void rbd_img_request_put(struct rbd_img_request *img_request) |
| { |
| rbd_assert(img_request != NULL); |
| dout("%s: img %p (was %d)\n", __func__, img_request, |
| kref_read(&img_request->kref)); |
| if (img_request_child_test(img_request)) |
| kref_put(&img_request->kref, rbd_parent_request_destroy); |
| else |
| kref_put(&img_request->kref, rbd_img_request_destroy); |
| } |
| |
| static inline void rbd_img_obj_request_add(struct rbd_img_request *img_request, |
| struct rbd_obj_request *obj_request) |
| { |
| rbd_assert(obj_request->img_request == NULL); |
| |
| /* Image request now owns object's original reference */ |
| obj_request->img_request = img_request; |
| obj_request->which = img_request->obj_request_count; |
| rbd_assert(!obj_request_img_data_test(obj_request)); |
| obj_request_img_data_set(obj_request); |
| rbd_assert(obj_request->which != BAD_WHICH); |
| img_request->obj_request_count++; |
| list_add_tail(&obj_request->links, &img_request->obj_requests); |
| dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
| obj_request->which); |
| } |
| |
| static inline void rbd_img_obj_request_del(struct rbd_img_request *img_request, |
| struct rbd_obj_request *obj_request) |
| { |
| rbd_assert(obj_request->which != BAD_WHICH); |
| |
| dout("%s: img %p obj %p w=%u\n", __func__, img_request, obj_request, |
| obj_request->which); |
| list_del(&obj_request->links); |
| rbd_assert(img_request->obj_request_count > 0); |
| img_request->obj_request_count--; |
| rbd_assert(obj_request->which == img_request->obj_request_count); |
| obj_request->which = BAD_WHICH; |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| rbd_assert(obj_request->img_request == img_request); |
| obj_request->img_request = NULL; |
| obj_request->callback = NULL; |
| rbd_obj_request_put(obj_request); |
| } |
| |
| static bool obj_request_type_valid(enum obj_request_type type) |
| { |
| switch (type) { |
| case OBJ_REQUEST_NODATA: |
| case OBJ_REQUEST_BIO: |
| case OBJ_REQUEST_PAGES: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static void rbd_img_obj_callback(struct rbd_obj_request *obj_request); |
| |
| static void rbd_obj_request_submit(struct rbd_obj_request *obj_request) |
| { |
| struct ceph_osd_request *osd_req = obj_request->osd_req; |
| |
| dout("%s %p object_no %016llx %llu~%llu osd_req %p\n", __func__, |
| obj_request, obj_request->object_no, obj_request->offset, |
| obj_request->length, osd_req); |
| if (obj_request_img_data_test(obj_request)) { |
| WARN_ON(obj_request->callback != rbd_img_obj_callback); |
| rbd_img_request_get(obj_request->img_request); |
| } |
| ceph_osdc_start_request(osd_req->r_osdc, osd_req, false); |
| } |
| |
| static void rbd_img_request_complete(struct rbd_img_request *img_request) |
| { |
| |
| dout("%s: img %p\n", __func__, img_request); |
| |
| /* |
| * If no error occurred, compute the aggregate transfer |
| * count for the image request. We could instead use |
| * atomic64_cmpxchg() to update it as each object request |
| * completes; not clear which way is better off hand. |
| */ |
| if (!img_request->result) { |
| struct rbd_obj_request *obj_request; |
| u64 xferred = 0; |
| |
| for_each_obj_request(img_request, obj_request) |
| xferred += obj_request->xferred; |
| img_request->xferred = xferred; |
| } |
| |
| if (img_request->callback) |
| img_request->callback(img_request); |
| else |
| rbd_img_request_put(img_request); |
| } |
| |
| /* |
| * The default/initial value for all image request flags is 0. Each |
| * is conditionally set to 1 at image request initialization time |
| * and currently never change thereafter. |
| */ |
| static void img_request_write_set(struct rbd_img_request *img_request) |
| { |
| set_bit(IMG_REQ_WRITE, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static bool img_request_write_test(struct rbd_img_request *img_request) |
| { |
| smp_mb(); |
| return test_bit(IMG_REQ_WRITE, &img_request->flags) != 0; |
| } |
| |
| /* |
| * Set the discard flag when the img_request is an discard request |
| */ |
| static void img_request_discard_set(struct rbd_img_request *img_request) |
| { |
| set_bit(IMG_REQ_DISCARD, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static bool img_request_discard_test(struct rbd_img_request *img_request) |
| { |
| smp_mb(); |
| return test_bit(IMG_REQ_DISCARD, &img_request->flags) != 0; |
| } |
| |
| static void img_request_child_set(struct rbd_img_request *img_request) |
| { |
| set_bit(IMG_REQ_CHILD, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static void img_request_child_clear(struct rbd_img_request *img_request) |
| { |
| clear_bit(IMG_REQ_CHILD, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static bool img_request_child_test(struct rbd_img_request *img_request) |
| { |
| smp_mb(); |
| return test_bit(IMG_REQ_CHILD, &img_request->flags) != 0; |
| } |
| |
| static void img_request_layered_set(struct rbd_img_request *img_request) |
| { |
| set_bit(IMG_REQ_LAYERED, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static void img_request_layered_clear(struct rbd_img_request *img_request) |
| { |
| clear_bit(IMG_REQ_LAYERED, &img_request->flags); |
| smp_mb(); |
| } |
| |
| static bool img_request_layered_test(struct rbd_img_request *img_request) |
| { |
| smp_mb(); |
| return test_bit(IMG_REQ_LAYERED, &img_request->flags) != 0; |
| } |
| |
| static enum obj_operation_type |
| rbd_img_request_op_type(struct rbd_img_request *img_request) |
| { |
| if (img_request_write_test(img_request)) |
| return OBJ_OP_WRITE; |
| else if (img_request_discard_test(img_request)) |
| return OBJ_OP_DISCARD; |
| else |
| return OBJ_OP_READ; |
| } |
| |
| static void |
| rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) |
| { |
| u64 xferred = obj_request->xferred; |
| u64 length = obj_request->length; |
| |
| dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
| obj_request, obj_request->img_request, obj_request->result, |
| xferred, length); |
| /* |
| * ENOENT means a hole in the image. We zero-fill the entire |
| * length of the request. A short read also implies zero-fill |
| * to the end of the request. An error requires the whole |
| * length of the request to be reported finished with an error |
| * to the block layer. In each case we update the xferred |
| * count to indicate the whole request was satisfied. |
| */ |
| rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); |
| if (obj_request->result == -ENOENT) { |
| if (obj_request->type == OBJ_REQUEST_BIO) |
| zero_bio_chain(obj_request->bio_list, 0); |
| else |
| zero_pages(obj_request->pages, 0, length); |
| obj_request->result = 0; |
| } else if (xferred < length && !obj_request->result) { |
| if (obj_request->type == OBJ_REQUEST_BIO) |
| zero_bio_chain(obj_request->bio_list, xferred); |
| else |
| zero_pages(obj_request->pages, xferred, length); |
| } |
| obj_request->xferred = length; |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p cb %p\n", __func__, obj_request, |
| obj_request->callback); |
| if (obj_request->callback) |
| obj_request->callback(obj_request); |
| else |
| complete_all(&obj_request->completion); |
| } |
| |
| static void rbd_obj_request_error(struct rbd_obj_request *obj_request, int err) |
| { |
| obj_request->result = err; |
| obj_request->xferred = 0; |
| /* |
| * kludge - mirror rbd_obj_request_submit() to match a put in |
| * rbd_img_obj_callback() |
| */ |
| if (obj_request_img_data_test(obj_request)) { |
| WARN_ON(obj_request->callback != rbd_img_obj_callback); |
| rbd_img_request_get(obj_request->img_request); |
| } |
| obj_request_done_set(obj_request); |
| rbd_obj_request_complete(obj_request); |
| } |
| |
| static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request = NULL; |
| struct rbd_device *rbd_dev = NULL; |
| bool layered = false; |
| |
| if (obj_request_img_data_test(obj_request)) { |
| img_request = obj_request->img_request; |
| layered = img_request && img_request_layered_test(img_request); |
| rbd_dev = img_request->rbd_dev; |
| } |
| |
| dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, |
| obj_request, img_request, obj_request->result, |
| obj_request->xferred, obj_request->length); |
| if (layered && obj_request->result == -ENOENT && |
| obj_request->img_offset < rbd_dev->parent_overlap) |
| rbd_img_parent_read(obj_request); |
| else if (img_request) |
| rbd_img_obj_request_read_callback(obj_request); |
| else |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
| obj_request->result, obj_request->length); |
| /* |
| * There is no such thing as a successful short write. Set |
| * it to our originally-requested length. |
| */ |
| obj_request->xferred = obj_request->length; |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p result %d %llu\n", __func__, obj_request, |
| obj_request->result, obj_request->length); |
| /* |
| * There is no such thing as a successful short discard. Set |
| * it to our originally-requested length. |
| */ |
| obj_request->xferred = obj_request->length; |
| /* discarding a non-existent object is not a problem */ |
| if (obj_request->result == -ENOENT) |
| obj_request->result = 0; |
| obj_request_done_set(obj_request); |
| } |
| |
| /* |
| * For a simple stat call there's nothing to do. We'll do more if |
| * this is part of a write sequence for a layered image. |
| */ |
| static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p\n", __func__, obj_request); |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) |
| { |
| dout("%s: obj %p\n", __func__, obj_request); |
| |
| if (obj_request_img_data_test(obj_request)) |
| rbd_osd_copyup_callback(obj_request); |
| else |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) |
| { |
| struct rbd_obj_request *obj_request = osd_req->r_priv; |
| u16 opcode; |
| |
| dout("%s: osd_req %p\n", __func__, osd_req); |
| rbd_assert(osd_req == obj_request->osd_req); |
| if (obj_request_img_data_test(obj_request)) { |
| rbd_assert(obj_request->img_request); |
| rbd_assert(obj_request->which != BAD_WHICH); |
| } else { |
| rbd_assert(obj_request->which == BAD_WHICH); |
| } |
| |
| if (osd_req->r_result < 0) |
| obj_request->result = osd_req->r_result; |
| |
| /* |
| * We support a 64-bit length, but ultimately it has to be |
| * passed to the block layer, which just supports a 32-bit |
| * length field. |
| */ |
| obj_request->xferred = osd_req->r_ops[0].outdata_len; |
| rbd_assert(obj_request->xferred < (u64)UINT_MAX); |
| |
| opcode = osd_req->r_ops[0].op; |
| switch (opcode) { |
| case CEPH_OSD_OP_READ: |
| rbd_osd_read_callback(obj_request); |
| break; |
| case CEPH_OSD_OP_SETALLOCHINT: |
| rbd_assert(osd_req->r_ops[1].op == CEPH_OSD_OP_WRITE || |
| osd_req->r_ops[1].op == CEPH_OSD_OP_WRITEFULL); |
| /* fall through */ |
| case CEPH_OSD_OP_WRITE: |
| case CEPH_OSD_OP_WRITEFULL: |
| rbd_osd_write_callback(obj_request); |
| break; |
| case CEPH_OSD_OP_STAT: |
| rbd_osd_stat_callback(obj_request); |
| break; |
| case CEPH_OSD_OP_DELETE: |
| case CEPH_OSD_OP_TRUNCATE: |
| case CEPH_OSD_OP_ZERO: |
| rbd_osd_discard_callback(obj_request); |
| break; |
| case CEPH_OSD_OP_CALL: |
| rbd_osd_call_callback(obj_request); |
| break; |
| default: |
| rbd_warn(NULL, "unexpected OSD op: object_no %016llx opcode %d", |
| obj_request->object_no, opcode); |
| break; |
| } |
| |
| if (obj_request_done_test(obj_request)) |
| rbd_obj_request_complete(obj_request); |
| } |
| |
| static void rbd_osd_req_format_read(struct rbd_obj_request *obj_request) |
| { |
| struct ceph_osd_request *osd_req = obj_request->osd_req; |
| |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| osd_req->r_snapid = obj_request->img_request->snap_id; |
| } |
| |
| static void rbd_osd_req_format_write(struct rbd_obj_request *obj_request) |
| { |
| struct ceph_osd_request *osd_req = obj_request->osd_req; |
| |
| ktime_get_real_ts(&osd_req->r_mtime); |
| osd_req->r_data_offset = obj_request->offset; |
| } |
| |
| static struct ceph_osd_request * |
| __rbd_osd_req_create(struct rbd_device *rbd_dev, |
| struct ceph_snap_context *snapc, |
| int num_ops, unsigned int flags, |
| struct rbd_obj_request *obj_request) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct ceph_osd_request *req; |
| const char *name_format = rbd_dev->image_format == 1 ? |
| RBD_V1_DATA_FORMAT : RBD_V2_DATA_FORMAT; |
| |
| req = ceph_osdc_alloc_request(osdc, snapc, num_ops, false, GFP_NOIO); |
| if (!req) |
| return NULL; |
| |
| req->r_flags = flags; |
| req->r_callback = rbd_osd_req_callback; |
| req->r_priv = obj_request; |
| |
| req->r_base_oloc.pool = rbd_dev->layout.pool_id; |
| if (ceph_oid_aprintf(&req->r_base_oid, GFP_NOIO, name_format, |
| rbd_dev->header.object_prefix, obj_request->object_no)) |
| goto err_req; |
| |
| if (ceph_osdc_alloc_messages(req, GFP_NOIO)) |
| goto err_req; |
| |
| return req; |
| |
| err_req: |
| ceph_osdc_put_request(req); |
| return NULL; |
| } |
| |
| /* |
| * Create an osd request. A read request has one osd op (read). |
| * A write request has either one (watch) or two (hint+write) osd ops. |
| * (All rbd data writes are prefixed with an allocation hint op, but |
| * technically osd watch is a write request, hence this distinction.) |
| */ |
| static struct ceph_osd_request *rbd_osd_req_create( |
| struct rbd_device *rbd_dev, |
| enum obj_operation_type op_type, |
| unsigned int num_ops, |
| struct rbd_obj_request *obj_request) |
| { |
| struct ceph_snap_context *snapc = NULL; |
| |
| if (obj_request_img_data_test(obj_request) && |
| (op_type == OBJ_OP_DISCARD || op_type == OBJ_OP_WRITE)) { |
| struct rbd_img_request *img_request = obj_request->img_request; |
| if (op_type == OBJ_OP_WRITE) { |
| rbd_assert(img_request_write_test(img_request)); |
| } else { |
| rbd_assert(img_request_discard_test(img_request)); |
| } |
| snapc = img_request->snapc; |
| } |
| |
| rbd_assert(num_ops == 1 || ((op_type == OBJ_OP_WRITE) && num_ops == 2)); |
| |
| return __rbd_osd_req_create(rbd_dev, snapc, num_ops, |
| (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) ? |
| CEPH_OSD_FLAG_WRITE : CEPH_OSD_FLAG_READ, obj_request); |
| } |
| |
| /* |
| * Create a copyup osd request based on the information in the object |
| * request supplied. A copyup request has two or three osd ops, a |
| * copyup method call, potentially a hint op, and a write or truncate |
| * or zero op. |
| */ |
| static struct ceph_osd_request * |
| rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request; |
| int num_osd_ops = 3; |
| |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| img_request = obj_request->img_request; |
| rbd_assert(img_request); |
| rbd_assert(img_request_write_test(img_request) || |
| img_request_discard_test(img_request)); |
| |
| if (img_request_discard_test(img_request)) |
| num_osd_ops = 2; |
| |
| return __rbd_osd_req_create(img_request->rbd_dev, |
| img_request->snapc, num_osd_ops, |
| CEPH_OSD_FLAG_WRITE, obj_request); |
| } |
| |
| static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
| { |
| ceph_osdc_put_request(osd_req); |
| } |
| |
| static struct rbd_obj_request * |
| rbd_obj_request_create(enum obj_request_type type) |
| { |
| struct rbd_obj_request *obj_request; |
| |
| rbd_assert(obj_request_type_valid(type)); |
| |
| obj_request = kmem_cache_zalloc(rbd_obj_request_cache, GFP_NOIO); |
| if (!obj_request) |
| return NULL; |
| |
| obj_request->which = BAD_WHICH; |
| obj_request->type = type; |
| INIT_LIST_HEAD(&obj_request->links); |
| init_completion(&obj_request->completion); |
| kref_init(&obj_request->kref); |
| |
| dout("%s %p\n", __func__, obj_request); |
| return obj_request; |
| } |
| |
| static void rbd_obj_request_destroy(struct kref *kref) |
| { |
| struct rbd_obj_request *obj_request; |
| |
| obj_request = container_of(kref, struct rbd_obj_request, kref); |
| |
| dout("%s: obj %p\n", __func__, obj_request); |
| |
| rbd_assert(obj_request->img_request == NULL); |
| rbd_assert(obj_request->which == BAD_WHICH); |
| |
| if (obj_request->osd_req) |
| rbd_osd_req_destroy(obj_request->osd_req); |
| |
| rbd_assert(obj_request_type_valid(obj_request->type)); |
| switch (obj_request->type) { |
| case OBJ_REQUEST_NODATA: |
| break; /* Nothing to do */ |
| case OBJ_REQUEST_BIO: |
| if (obj_request->bio_list) |
| bio_chain_put(obj_request->bio_list); |
| break; |
| case OBJ_REQUEST_PAGES: |
| /* img_data requests don't own their page array */ |
| if (obj_request->pages && |
| !obj_request_img_data_test(obj_request)) |
| ceph_release_page_vector(obj_request->pages, |
| obj_request->page_count); |
| break; |
| } |
| |
| kmem_cache_free(rbd_obj_request_cache, obj_request); |
| } |
| |
| /* It's OK to call this for a device with no parent */ |
| |
| static void rbd_spec_put(struct rbd_spec *spec); |
| static void rbd_dev_unparent(struct rbd_device *rbd_dev) |
| { |
| rbd_dev_remove_parent(rbd_dev); |
| rbd_spec_put(rbd_dev->parent_spec); |
| rbd_dev->parent_spec = NULL; |
| rbd_dev->parent_overlap = 0; |
| } |
| |
| /* |
| * Parent image reference counting is used to determine when an |
| * image's parent fields can be safely torn down--after there are no |
| * more in-flight requests to the parent image. When the last |
| * reference is dropped, cleaning them up is safe. |
| */ |
| static void rbd_dev_parent_put(struct rbd_device *rbd_dev) |
| { |
| int counter; |
| |
| if (!rbd_dev->parent_spec) |
| return; |
| |
| counter = atomic_dec_return_safe(&rbd_dev->parent_ref); |
| if (counter > 0) |
| return; |
| |
| /* Last reference; clean up parent data structures */ |
| |
| if (!counter) |
| rbd_dev_unparent(rbd_dev); |
| else |
| rbd_warn(rbd_dev, "parent reference underflow"); |
| } |
| |
| /* |
| * If an image has a non-zero parent overlap, get a reference to its |
| * parent. |
| * |
| * Returns true if the rbd device has a parent with a non-zero |
| * overlap and a reference for it was successfully taken, or |
| * false otherwise. |
| */ |
| static bool rbd_dev_parent_get(struct rbd_device *rbd_dev) |
| { |
| int counter = 0; |
| |
| if (!rbd_dev->parent_spec) |
| return false; |
| |
| down_read(&rbd_dev->header_rwsem); |
| if (rbd_dev->parent_overlap) |
| counter = atomic_inc_return_safe(&rbd_dev->parent_ref); |
| up_read(&rbd_dev->header_rwsem); |
| |
| if (counter < 0) |
| rbd_warn(rbd_dev, "parent reference overflow"); |
| |
| return counter > 0; |
| } |
| |
| /* |
| * Caller is responsible for filling in the list of object requests |
| * that comprises the image request, and the Linux request pointer |
| * (if there is one). |
| */ |
| static struct rbd_img_request *rbd_img_request_create( |
| struct rbd_device *rbd_dev, |
| u64 offset, u64 length, |
| enum obj_operation_type op_type, |
| struct ceph_snap_context *snapc) |
| { |
| struct rbd_img_request *img_request; |
| |
| img_request = kmem_cache_alloc(rbd_img_request_cache, GFP_NOIO); |
| if (!img_request) |
| return NULL; |
| |
| img_request->rq = NULL; |
| img_request->rbd_dev = rbd_dev; |
| img_request->offset = offset; |
| img_request->length = length; |
| img_request->flags = 0; |
| if (op_type == OBJ_OP_DISCARD) { |
| img_request_discard_set(img_request); |
| img_request->snapc = snapc; |
| } else if (op_type == OBJ_OP_WRITE) { |
| img_request_write_set(img_request); |
| img_request->snapc = snapc; |
| } else { |
| img_request->snap_id = rbd_dev->spec->snap_id; |
| } |
| if (rbd_dev_parent_get(rbd_dev)) |
| img_request_layered_set(img_request); |
| spin_lock_init(&img_request->completion_lock); |
| img_request->next_completion = 0; |
| img_request->callback = NULL; |
| img_request->result = 0; |
| img_request->obj_request_count = 0; |
| INIT_LIST_HEAD(&img_request->obj_requests); |
| kref_init(&img_request->kref); |
| |
| dout("%s: rbd_dev %p %s %llu/%llu -> img %p\n", __func__, rbd_dev, |
| obj_op_name(op_type), offset, length, img_request); |
| |
| return img_request; |
| } |
| |
| static void rbd_img_request_destroy(struct kref *kref) |
| { |
| struct rbd_img_request *img_request; |
| struct rbd_obj_request *obj_request; |
| struct rbd_obj_request *next_obj_request; |
| |
| img_request = container_of(kref, struct rbd_img_request, kref); |
| |
| dout("%s: img %p\n", __func__, img_request); |
| |
| for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
| rbd_img_obj_request_del(img_request, obj_request); |
| rbd_assert(img_request->obj_request_count == 0); |
| |
| if (img_request_layered_test(img_request)) { |
| img_request_layered_clear(img_request); |
| rbd_dev_parent_put(img_request->rbd_dev); |
| } |
| |
| if (img_request_write_test(img_request) || |
| img_request_discard_test(img_request)) |
| ceph_put_snap_context(img_request->snapc); |
| |
| kmem_cache_free(rbd_img_request_cache, img_request); |
| } |
| |
| static struct rbd_img_request *rbd_parent_request_create( |
| struct rbd_obj_request *obj_request, |
| u64 img_offset, u64 length) |
| { |
| struct rbd_img_request *parent_request; |
| struct rbd_device *rbd_dev; |
| |
| rbd_assert(obj_request->img_request); |
| rbd_dev = obj_request->img_request->rbd_dev; |
| |
| parent_request = rbd_img_request_create(rbd_dev->parent, img_offset, |
| length, OBJ_OP_READ, NULL); |
| if (!parent_request) |
| return NULL; |
| |
| img_request_child_set(parent_request); |
| rbd_obj_request_get(obj_request); |
| parent_request->obj_request = obj_request; |
| |
| return parent_request; |
| } |
| |
| static void rbd_parent_request_destroy(struct kref *kref) |
| { |
| struct rbd_img_request *parent_request; |
| struct rbd_obj_request *orig_request; |
| |
| parent_request = container_of(kref, struct rbd_img_request, kref); |
| orig_request = parent_request->obj_request; |
| |
| parent_request->obj_request = NULL; |
| rbd_obj_request_put(orig_request); |
| img_request_child_clear(parent_request); |
| |
| rbd_img_request_destroy(kref); |
| } |
| |
| static bool rbd_img_obj_end_request(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request; |
| unsigned int xferred; |
| int result; |
| bool more; |
| |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| img_request = obj_request->img_request; |
| |
| rbd_assert(obj_request->xferred <= (u64)UINT_MAX); |
| xferred = (unsigned int)obj_request->xferred; |
| result = obj_request->result; |
| if (result) { |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| enum obj_operation_type op_type; |
| |
| if (img_request_discard_test(img_request)) |
| op_type = OBJ_OP_DISCARD; |
| else if (img_request_write_test(img_request)) |
| op_type = OBJ_OP_WRITE; |
| else |
| op_type = OBJ_OP_READ; |
| |
| rbd_warn(rbd_dev, "%s %llx at %llx (%llx)", |
| obj_op_name(op_type), obj_request->length, |
| obj_request->img_offset, obj_request->offset); |
| rbd_warn(rbd_dev, " result %d xferred %x", |
| result, xferred); |
| if (!img_request->result) |
| img_request->result = result; |
| /* |
| * Need to end I/O on the entire obj_request worth of |
| * bytes in case of error. |
| */ |
| xferred = obj_request->length; |
| } |
| |
| if (img_request_child_test(img_request)) { |
| rbd_assert(img_request->obj_request != NULL); |
| more = obj_request->which < img_request->obj_request_count - 1; |
| } else { |
| blk_status_t status = errno_to_blk_status(result); |
| |
| rbd_assert(img_request->rq != NULL); |
| |
| more = blk_update_request(img_request->rq, status, xferred); |
| if (!more) |
| __blk_mq_end_request(img_request->rq, status); |
| } |
| |
| return more; |
| } |
| |
| static void rbd_img_obj_callback(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request; |
| u32 which = obj_request->which; |
| bool more = true; |
| |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| img_request = obj_request->img_request; |
| |
| dout("%s: img %p obj %p\n", __func__, img_request, obj_request); |
| rbd_assert(img_request != NULL); |
| rbd_assert(img_request->obj_request_count > 0); |
| rbd_assert(which != BAD_WHICH); |
| rbd_assert(which < img_request->obj_request_count); |
| |
| spin_lock_irq(&img_request->completion_lock); |
| if (which != img_request->next_completion) |
| goto out; |
| |
| for_each_obj_request_from(img_request, obj_request) { |
| rbd_assert(more); |
| rbd_assert(which < img_request->obj_request_count); |
| |
| if (!obj_request_done_test(obj_request)) |
| break; |
| more = rbd_img_obj_end_request(obj_request); |
| which++; |
| } |
| |
| rbd_assert(more ^ (which == img_request->obj_request_count)); |
| img_request->next_completion = which; |
| out: |
| spin_unlock_irq(&img_request->completion_lock); |
| rbd_img_request_put(img_request); |
| |
| if (!more) |
| rbd_img_request_complete(img_request); |
| } |
| |
| /* |
| * Add individual osd ops to the given ceph_osd_request and prepare |
| * them for submission. num_ops is the current number of |
| * osd operations already to the object request. |
| */ |
| static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, |
| struct ceph_osd_request *osd_request, |
| enum obj_operation_type op_type, |
| unsigned int num_ops) |
| { |
| struct rbd_img_request *img_request = obj_request->img_request; |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| u64 object_size = rbd_obj_bytes(&rbd_dev->header); |
| u64 offset = obj_request->offset; |
| u64 length = obj_request->length; |
| u64 img_end; |
| u16 opcode; |
| |
| if (op_type == OBJ_OP_DISCARD) { |
| if (!offset && length == object_size && |
| (!img_request_layered_test(img_request) || |
| !obj_request_overlaps_parent(obj_request))) { |
| opcode = CEPH_OSD_OP_DELETE; |
| } else if ((offset + length == object_size)) { |
| opcode = CEPH_OSD_OP_TRUNCATE; |
| } else { |
| down_read(&rbd_dev->header_rwsem); |
| img_end = rbd_dev->header.image_size; |
| up_read(&rbd_dev->header_rwsem); |
| |
| if (obj_request->img_offset + length == img_end) |
| opcode = CEPH_OSD_OP_TRUNCATE; |
| else |
| opcode = CEPH_OSD_OP_ZERO; |
| } |
| } else if (op_type == OBJ_OP_WRITE) { |
| if (!offset && length == object_size) |
| opcode = CEPH_OSD_OP_WRITEFULL; |
| else |
| opcode = CEPH_OSD_OP_WRITE; |
| osd_req_op_alloc_hint_init(osd_request, num_ops, |
| object_size, object_size); |
| num_ops++; |
| } else { |
| opcode = CEPH_OSD_OP_READ; |
| } |
| |
| if (opcode == CEPH_OSD_OP_DELETE) |
| osd_req_op_init(osd_request, num_ops, opcode, 0); |
| else |
| osd_req_op_extent_init(osd_request, num_ops, opcode, |
| offset, length, 0, 0); |
| |
| if (obj_request->type == OBJ_REQUEST_BIO) |
| osd_req_op_extent_osd_data_bio(osd_request, num_ops, |
| obj_request->bio_list, length); |
| else if (obj_request->type == OBJ_REQUEST_PAGES) |
| osd_req_op_extent_osd_data_pages(osd_request, num_ops, |
| obj_request->pages, length, |
| offset & ~PAGE_MASK, false, false); |
| |
| /* Discards are also writes */ |
| if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) |
| rbd_osd_req_format_write(obj_request); |
| else |
| rbd_osd_req_format_read(obj_request); |
| } |
| |
| /* |
| * Split up an image request into one or more object requests, each |
| * to a different object. The "type" parameter indicates whether |
| * "data_desc" is the pointer to the head of a list of bio |
| * structures, or the base of a page array. In either case this |
| * function assumes data_desc describes memory sufficient to hold |
| * all data described by the image request. |
| */ |
| static int rbd_img_request_fill(struct rbd_img_request *img_request, |
| enum obj_request_type type, |
| void *data_desc) |
| { |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| struct rbd_obj_request *obj_request = NULL; |
| struct rbd_obj_request *next_obj_request; |
| struct bio *bio_list = NULL; |
| unsigned int bio_offset = 0; |
| struct page **pages = NULL; |
| enum obj_operation_type op_type; |
| u64 img_offset; |
| u64 resid; |
| |
| dout("%s: img %p type %d data_desc %p\n", __func__, img_request, |
| (int)type, data_desc); |
| |
| img_offset = img_request->offset; |
| resid = img_request->length; |
| rbd_assert(resid > 0); |
| op_type = rbd_img_request_op_type(img_request); |
| |
| if (type == OBJ_REQUEST_BIO) { |
| bio_list = data_desc; |
| rbd_assert(img_offset == |
| bio_list->bi_iter.bi_sector << SECTOR_SHIFT); |
| } else if (type == OBJ_REQUEST_PAGES) { |
| pages = data_desc; |
| } |
| |
| while (resid) { |
| struct ceph_osd_request *osd_req; |
| u64 object_no = img_offset >> rbd_dev->header.obj_order; |
| u64 offset = rbd_segment_offset(rbd_dev, img_offset); |
| u64 length = rbd_segment_length(rbd_dev, img_offset, resid); |
| |
| obj_request = rbd_obj_request_create(type); |
| if (!obj_request) |
| goto out_unwind; |
| |
| obj_request->object_no = object_no; |
| obj_request->offset = offset; |
| obj_request->length = length; |
| |
| /* |
| * set obj_request->img_request before creating the |
| * osd_request so that it gets the right snapc |
| */ |
| rbd_img_obj_request_add(img_request, obj_request); |
| |
| if (type == OBJ_REQUEST_BIO) { |
| unsigned int clone_size; |
| |
| rbd_assert(length <= (u64)UINT_MAX); |
| clone_size = (unsigned int)length; |
| obj_request->bio_list = |
| bio_chain_clone_range(&bio_list, |
| &bio_offset, |
| clone_size, |
| GFP_NOIO); |
| if (!obj_request->bio_list) |
| goto out_unwind; |
| } else if (type == OBJ_REQUEST_PAGES) { |
| unsigned int page_count; |
| |
| obj_request->pages = pages; |
| page_count = (u32)calc_pages_for(offset, length); |
| obj_request->page_count = page_count; |
| if ((offset + length) & ~PAGE_MASK) |
| page_count--; /* more on last page */ |
| pages += page_count; |
| } |
| |
| osd_req = rbd_osd_req_create(rbd_dev, op_type, |
| (op_type == OBJ_OP_WRITE) ? 2 : 1, |
| obj_request); |
| if (!osd_req) |
| goto out_unwind; |
| |
| obj_request->osd_req = osd_req; |
| obj_request->callback = rbd_img_obj_callback; |
| obj_request->img_offset = img_offset; |
| |
| rbd_img_obj_request_fill(obj_request, osd_req, op_type, 0); |
| |
| img_offset += length; |
| resid -= length; |
| } |
| |
| return 0; |
| |
| out_unwind: |
| for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
| rbd_img_obj_request_del(img_request, obj_request); |
| |
| return -ENOMEM; |
| } |
| |
| static void |
| rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request; |
| struct rbd_device *rbd_dev; |
| struct page **pages; |
| u32 page_count; |
| |
| dout("%s: obj %p\n", __func__, obj_request); |
| |
| rbd_assert(obj_request->type == OBJ_REQUEST_BIO || |
| obj_request->type == OBJ_REQUEST_NODATA); |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| img_request = obj_request->img_request; |
| rbd_assert(img_request); |
| |
| rbd_dev = img_request->rbd_dev; |
| rbd_assert(rbd_dev); |
| |
| pages = obj_request->copyup_pages; |
| rbd_assert(pages != NULL); |
| obj_request->copyup_pages = NULL; |
| page_count = obj_request->copyup_page_count; |
| rbd_assert(page_count); |
| obj_request->copyup_page_count = 0; |
| ceph_release_page_vector(pages, page_count); |
| |
| /* |
| * We want the transfer count to reflect the size of the |
| * original write request. There is no such thing as a |
| * successful short write, so if the request was successful |
| * we can just set it to the originally-requested length. |
| */ |
| if (!obj_request->result) |
| obj_request->xferred = obj_request->length; |
| |
| obj_request_done_set(obj_request); |
| } |
| |
| static void |
| rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) |
| { |
| struct rbd_obj_request *orig_request; |
| struct ceph_osd_request *osd_req; |
| struct rbd_device *rbd_dev; |
| struct page **pages; |
| enum obj_operation_type op_type; |
| u32 page_count; |
| int img_result; |
| u64 parent_length; |
| |
| rbd_assert(img_request_child_test(img_request)); |
| |
| /* First get what we need from the image request */ |
| |
| pages = img_request->copyup_pages; |
| rbd_assert(pages != NULL); |
| img_request->copyup_pages = NULL; |
| page_count = img_request->copyup_page_count; |
| rbd_assert(page_count); |
| img_request->copyup_page_count = 0; |
| |
| orig_request = img_request->obj_request; |
| rbd_assert(orig_request != NULL); |
| rbd_assert(obj_request_type_valid(orig_request->type)); |
| img_result = img_request->result; |
| parent_length = img_request->length; |
| rbd_assert(img_result || parent_length == img_request->xferred); |
| rbd_img_request_put(img_request); |
| |
| rbd_assert(orig_request->img_request); |
| rbd_dev = orig_request->img_request->rbd_dev; |
| rbd_assert(rbd_dev); |
| |
| /* |
| * If the overlap has become 0 (most likely because the |
| * image has been flattened) we need to free the pages |
| * and re-submit the original write request. |
| */ |
| if (!rbd_dev->parent_overlap) { |
| ceph_release_page_vector(pages, page_count); |
| rbd_obj_request_submit(orig_request); |
| return; |
| } |
| |
| if (img_result) |
| goto out_err; |
| |
| /* |
| * The original osd request is of no use to use any more. |
| * We need a new one that can hold the three ops in a copyup |
| * request. Allocate the new copyup osd request for the |
| * original request, and release the old one. |
| */ |
| img_result = -ENOMEM; |
| osd_req = rbd_osd_req_create_copyup(orig_request); |
| if (!osd_req) |
| goto out_err; |
| rbd_osd_req_destroy(orig_request->osd_req); |
| orig_request->osd_req = osd_req; |
| orig_request->copyup_pages = pages; |
| orig_request->copyup_page_count = page_count; |
| |
| /* Initialize the copyup op */ |
| |
| osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); |
| osd_req_op_cls_request_data_pages(osd_req, 0, pages, parent_length, 0, |
| false, false); |
| |
| /* Add the other op(s) */ |
| |
| op_type = rbd_img_request_op_type(orig_request->img_request); |
| rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); |
| |
| /* All set, send it off. */ |
| |
| rbd_obj_request_submit(orig_request); |
| return; |
| |
| out_err: |
| ceph_release_page_vector(pages, page_count); |
| rbd_obj_request_error(orig_request, img_result); |
| } |
| |
| /* |
| * Read from the parent image the range of data that covers the |
| * entire target of the given object request. This is used for |
| * satisfying a layered image write request when the target of an |
| * object request from the image request does not exist. |
| * |
| * A page array big enough to hold the returned data is allocated |
| * and supplied to rbd_img_request_fill() as the "data descriptor." |
| * When the read completes, this page array will be transferred to |
| * the original object request for the copyup operation. |
| * |
| * If an error occurs, it is recorded as the result of the original |
| * object request in rbd_img_obj_exists_callback(). |
| */ |
| static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
| struct rbd_img_request *parent_request = NULL; |
| u64 img_offset; |
| u64 length; |
| struct page **pages = NULL; |
| u32 page_count; |
| int result; |
| |
| rbd_assert(rbd_dev->parent != NULL); |
| |
| /* |
| * Determine the byte range covered by the object in the |
| * child image to which the original request was to be sent. |
| */ |
| img_offset = obj_request->img_offset - obj_request->offset; |
| length = rbd_obj_bytes(&rbd_dev->header); |
| |
| /* |
| * There is no defined parent data beyond the parent |
| * overlap, so limit what we read at that boundary if |
| * necessary. |
| */ |
| if (img_offset + length > rbd_dev->parent_overlap) { |
| rbd_assert(img_offset < rbd_dev->parent_overlap); |
| length = rbd_dev->parent_overlap - img_offset; |
| } |
| |
| /* |
| * Allocate a page array big enough to receive the data read |
| * from the parent. |
| */ |
| page_count = (u32)calc_pages_for(0, length); |
| pages = ceph_alloc_page_vector(page_count, GFP_NOIO); |
| if (IS_ERR(pages)) { |
| result = PTR_ERR(pages); |
| pages = NULL; |
| goto out_err; |
| } |
| |
| result = -ENOMEM; |
| parent_request = rbd_parent_request_create(obj_request, |
| img_offset, length); |
| if (!parent_request) |
| goto out_err; |
| |
| result = rbd_img_request_fill(parent_request, OBJ_REQUEST_PAGES, pages); |
| if (result) |
| goto out_err; |
| |
| parent_request->copyup_pages = pages; |
| parent_request->copyup_page_count = page_count; |
| parent_request->callback = rbd_img_obj_parent_read_full_callback; |
| |
| result = rbd_img_request_submit(parent_request); |
| if (!result) |
| return 0; |
| |
| parent_request->copyup_pages = NULL; |
| parent_request->copyup_page_count = 0; |
| parent_request->obj_request = NULL; |
| rbd_obj_request_put(obj_request); |
| out_err: |
| if (pages) |
| ceph_release_page_vector(pages, page_count); |
| if (parent_request) |
| rbd_img_request_put(parent_request); |
| return result; |
| } |
| |
| static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_obj_request *orig_request; |
| struct rbd_device *rbd_dev; |
| int result; |
| |
| rbd_assert(!obj_request_img_data_test(obj_request)); |
| |
| /* |
| * All we need from the object request is the original |
| * request and the result of the STAT op. Grab those, then |
| * we're done with the request. |
| */ |
| orig_request = obj_request->obj_request; |
| obj_request->obj_request = NULL; |
| rbd_obj_request_put(orig_request); |
| rbd_assert(orig_request); |
| rbd_assert(orig_request->img_request); |
| |
| result = obj_request->result; |
| obj_request->result = 0; |
| |
| dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, |
| obj_request, orig_request, result, |
| obj_request->xferred, obj_request->length); |
| rbd_obj_request_put(obj_request); |
| |
| /* |
| * If the overlap has become 0 (most likely because the |
| * image has been flattened) we need to re-submit the |
| * original request. |
| */ |
| rbd_dev = orig_request->img_request->rbd_dev; |
| if (!rbd_dev->parent_overlap) { |
| rbd_obj_request_submit(orig_request); |
| return; |
| } |
| |
| /* |
| * Our only purpose here is to determine whether the object |
| * exists, and we don't want to treat the non-existence as |
| * an error. If something else comes back, transfer the |
| * error to the original request and complete it now. |
| */ |
| if (!result) { |
| obj_request_existence_set(orig_request, true); |
| } else if (result == -ENOENT) { |
| obj_request_existence_set(orig_request, false); |
| } else { |
| goto fail_orig_request; |
| } |
| |
| /* |
| * Resubmit the original request now that we have recorded |
| * whether the target object exists. |
| */ |
| result = rbd_img_obj_request_submit(orig_request); |
| if (result) |
| goto fail_orig_request; |
| |
| return; |
| |
| fail_orig_request: |
| rbd_obj_request_error(orig_request, result); |
| } |
| |
| static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; |
| struct rbd_obj_request *stat_request; |
| struct page **pages; |
| u32 page_count; |
| size_t size; |
| int ret; |
| |
| stat_request = rbd_obj_request_create(OBJ_REQUEST_PAGES); |
| if (!stat_request) |
| return -ENOMEM; |
| |
| stat_request->object_no = obj_request->object_no; |
| |
| stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, |
| stat_request); |
| if (!stat_request->osd_req) { |
| ret = -ENOMEM; |
| goto fail_stat_request; |
| } |
| |
| /* |
| * The response data for a STAT call consists of: |
| * le64 length; |
| * struct { |
| * le32 tv_sec; |
| * le32 tv_nsec; |
| * } mtime; |
| */ |
| size = sizeof (__le64) + sizeof (__le32) + sizeof (__le32); |
| page_count = (u32)calc_pages_for(0, size); |
| pages = ceph_alloc_page_vector(page_count, GFP_NOIO); |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto fail_stat_request; |
| } |
| |
| osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); |
| osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, size, 0, |
| false, false); |
| |
| rbd_obj_request_get(obj_request); |
| stat_request->obj_request = obj_request; |
| stat_request->pages = pages; |
| stat_request->page_count = page_count; |
| stat_request->callback = rbd_img_obj_exists_callback; |
| |
| rbd_obj_request_submit(stat_request); |
| return 0; |
| |
| fail_stat_request: |
| rbd_obj_request_put(stat_request); |
| return ret; |
| } |
| |
| static bool img_obj_request_simple(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request = obj_request->img_request; |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| |
| /* Reads */ |
| if (!img_request_write_test(img_request) && |
| !img_request_discard_test(img_request)) |
| return true; |
| |
| /* Non-layered writes */ |
| if (!img_request_layered_test(img_request)) |
| return true; |
| |
| /* |
| * Layered writes outside of the parent overlap range don't |
| * share any data with the parent. |
| */ |
| if (!obj_request_overlaps_parent(obj_request)) |
| return true; |
| |
| /* |
| * Entire-object layered writes - we will overwrite whatever |
| * parent data there is anyway. |
| */ |
| if (!obj_request->offset && |
| obj_request->length == rbd_obj_bytes(&rbd_dev->header)) |
| return true; |
| |
| /* |
| * If the object is known to already exist, its parent data has |
| * already been copied. |
| */ |
| if (obj_request_known_test(obj_request) && |
| obj_request_exists_test(obj_request)) |
| return true; |
| |
| return false; |
| } |
| |
| static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) |
| { |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| rbd_assert(obj_request_type_valid(obj_request->type)); |
| rbd_assert(obj_request->img_request); |
| |
| if (img_obj_request_simple(obj_request)) { |
| rbd_obj_request_submit(obj_request); |
| return 0; |
| } |
| |
| /* |
| * It's a layered write. The target object might exist but |
| * we may not know that yet. If we know it doesn't exist, |
| * start by reading the data for the full target object from |
| * the parent so we can use it for a copyup to the target. |
| */ |
| if (obj_request_known_test(obj_request)) |
| return rbd_img_obj_parent_read_full(obj_request); |
| |
| /* We don't know whether the target exists. Go find out. */ |
| |
| return rbd_img_obj_exists_submit(obj_request); |
| } |
| |
| static int rbd_img_request_submit(struct rbd_img_request *img_request) |
| { |
| struct rbd_obj_request *obj_request; |
| struct rbd_obj_request *next_obj_request; |
| int ret = 0; |
| |
| dout("%s: img %p\n", __func__, img_request); |
| |
| rbd_img_request_get(img_request); |
| for_each_obj_request_safe(img_request, obj_request, next_obj_request) { |
| ret = rbd_img_obj_request_submit(obj_request); |
| if (ret) |
| goto out_put_ireq; |
| } |
| |
| out_put_ireq: |
| rbd_img_request_put(img_request); |
| return ret; |
| } |
| |
| static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) |
| { |
| struct rbd_obj_request *obj_request; |
| struct rbd_device *rbd_dev; |
| u64 obj_end; |
| u64 img_xferred; |
| int img_result; |
| |
| rbd_assert(img_request_child_test(img_request)); |
| |
| /* First get what we need from the image request and release it */ |
| |
| obj_request = img_request->obj_request; |
| img_xferred = img_request->xferred; |
| img_result = img_request->result; |
| rbd_img_request_put(img_request); |
| |
| /* |
| * If the overlap has become 0 (most likely because the |
| * image has been flattened) we need to re-submit the |
| * original request. |
| */ |
| rbd_assert(obj_request); |
| rbd_assert(obj_request->img_request); |
| rbd_dev = obj_request->img_request->rbd_dev; |
| if (!rbd_dev->parent_overlap) { |
| rbd_obj_request_submit(obj_request); |
| return; |
| } |
| |
| obj_request->result = img_result; |
| if (obj_request->result) |
| goto out; |
| |
| /* |
| * We need to zero anything beyond the parent overlap |
| * boundary. Since rbd_img_obj_request_read_callback() |
| * will zero anything beyond the end of a short read, an |
| * easy way to do this is to pretend the data from the |
| * parent came up short--ending at the overlap boundary. |
| */ |
| rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); |
| obj_end = obj_request->img_offset + obj_request->length; |
| if (obj_end > rbd_dev->parent_overlap) { |
| u64 xferred = 0; |
| |
| if (obj_request->img_offset < rbd_dev->parent_overlap) |
| xferred = rbd_dev->parent_overlap - |
| obj_request->img_offset; |
| |
| obj_request->xferred = min(img_xferred, xferred); |
| } else { |
| obj_request->xferred = img_xferred; |
| } |
| out: |
| rbd_img_obj_request_read_callback(obj_request); |
| rbd_obj_request_complete(obj_request); |
| } |
| |
| static void rbd_img_parent_read(struct rbd_obj_request *obj_request) |
| { |
| struct rbd_img_request *img_request; |
| int result; |
| |
| rbd_assert(obj_request_img_data_test(obj_request)); |
| rbd_assert(obj_request->img_request != NULL); |
| rbd_assert(obj_request->result == (s32) -ENOENT); |
| rbd_assert(obj_request_type_valid(obj_request->type)); |
| |
| /* rbd_read_finish(obj_request, obj_request->length); */ |
| img_request = rbd_parent_request_create(obj_request, |
| obj_request->img_offset, |
| obj_request->length); |
| result = -ENOMEM; |
| if (!img_request) |
| goto out_err; |
| |
| if (obj_request->type == OBJ_REQUEST_BIO) |
| result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
| obj_request->bio_list); |
| else |
| result = rbd_img_request_fill(img_request, OBJ_REQUEST_PAGES, |
| obj_request->pages); |
| if (result) |
| goto out_err; |
| |
| img_request->callback = rbd_img_parent_read_callback; |
| result = rbd_img_request_submit(img_request); |
| if (result) |
| goto out_err; |
| |
| return; |
| out_err: |
| if (img_request) |
| rbd_img_request_put(img_request); |
| obj_request->result = result; |
| obj_request->xferred = 0; |
| obj_request_done_set(obj_request); |
| } |
| |
| static const struct rbd_client_id rbd_empty_cid; |
| |
| static bool rbd_cid_equal(const struct rbd_client_id *lhs, |
| const struct rbd_client_id *rhs) |
| { |
| return lhs->gid == rhs->gid && lhs->handle == rhs->handle; |
| } |
| |
| static struct rbd_client_id rbd_get_cid(struct rbd_device *rbd_dev) |
| { |
| struct rbd_client_id cid; |
| |
| mutex_lock(&rbd_dev->watch_mutex); |
| cid.gid = ceph_client_gid(rbd_dev->rbd_client->client); |
| cid.handle = rbd_dev->watch_cookie; |
| mutex_unlock(&rbd_dev->watch_mutex); |
| return cid; |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static void rbd_set_owner_cid(struct rbd_device *rbd_dev, |
| const struct rbd_client_id *cid) |
| { |
| dout("%s rbd_dev %p %llu-%llu -> %llu-%llu\n", __func__, rbd_dev, |
| rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle, |
| cid->gid, cid->handle); |
| rbd_dev->owner_cid = *cid; /* struct */ |
| } |
| |
| static void format_lock_cookie(struct rbd_device *rbd_dev, char *buf) |
| { |
| mutex_lock(&rbd_dev->watch_mutex); |
| sprintf(buf, "%s %llu", RBD_LOCK_COOKIE_PREFIX, rbd_dev->watch_cookie); |
| mutex_unlock(&rbd_dev->watch_mutex); |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static int rbd_lock(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
| char cookie[32]; |
| int ret; |
| |
| WARN_ON(__rbd_is_lock_owner(rbd_dev) || |
| rbd_dev->lock_cookie[0] != '\0'); |
| |
| format_lock_cookie(rbd_dev, cookie); |
| ret = ceph_cls_lock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| RBD_LOCK_NAME, CEPH_CLS_LOCK_EXCLUSIVE, cookie, |
| RBD_LOCK_TAG, "", 0); |
| if (ret) |
| return ret; |
| |
| rbd_dev->lock_state = RBD_LOCK_STATE_LOCKED; |
| strcpy(rbd_dev->lock_cookie, cookie); |
| rbd_set_owner_cid(rbd_dev, &cid); |
| queue_work(rbd_dev->task_wq, &rbd_dev->acquired_lock_work); |
| return 0; |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static void rbd_unlock(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| int ret; |
| |
| WARN_ON(!__rbd_is_lock_owner(rbd_dev) || |
| rbd_dev->lock_cookie[0] == '\0'); |
| |
| ret = ceph_cls_unlock(osdc, &rbd_dev->header_oid, &rbd_dev->header_oloc, |
| RBD_LOCK_NAME, rbd_dev->lock_cookie); |
| if (ret && ret != -ENOENT) |
| rbd_warn(rbd_dev, "failed to unlock: %d", ret); |
| |
| /* treat errors as the image is unlocked */ |
| rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
| rbd_dev->lock_cookie[0] = '\0'; |
| rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| queue_work(rbd_dev->task_wq, &rbd_dev->released_lock_work); |
| } |
| |
| static int __rbd_notify_op_lock(struct rbd_device *rbd_dev, |
| enum rbd_notify_op notify_op, |
| struct page ***preply_pages, |
| size_t *preply_len) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct rbd_client_id cid = rbd_get_cid(rbd_dev); |
| int buf_size = 4 + 8 + 8 + CEPH_ENCODING_START_BLK_LEN; |
| char buf[buf_size]; |
| void *p = buf; |
| |
| dout("%s rbd_dev %p notify_op %d\n", __func__, rbd_dev, notify_op); |
| |
| /* encode *LockPayload NotifyMessage (op + ClientId) */ |
| ceph_start_encoding(&p, 2, 1, buf_size - CEPH_ENCODING_START_BLK_LEN); |
| ceph_encode_32(&p, notify_op); |
| ceph_encode_64(&p, cid.gid); |
| ceph_encode_64(&p, cid.handle); |
| |
| return ceph_osdc_notify(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, buf, buf_size, |
| RBD_NOTIFY_TIMEOUT, preply_pages, preply_len); |
| } |
| |
| static void rbd_notify_op_lock(struct rbd_device *rbd_dev, |
| enum rbd_notify_op notify_op) |
| { |
| struct page **reply_pages; |
| size_t reply_len; |
| |
| __rbd_notify_op_lock(rbd_dev, notify_op, &reply_pages, &reply_len); |
| ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); |
| } |
| |
| static void rbd_notify_acquired_lock(struct work_struct *work) |
| { |
| struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| acquired_lock_work); |
| |
| rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_ACQUIRED_LOCK); |
| } |
| |
| static void rbd_notify_released_lock(struct work_struct *work) |
| { |
| struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| released_lock_work); |
| |
| rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_RELEASED_LOCK); |
| } |
| |
| static int rbd_request_lock(struct rbd_device *rbd_dev) |
| { |
| struct page **reply_pages; |
| size_t reply_len; |
| bool lock_owner_responded = false; |
| int ret; |
| |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| ret = __rbd_notify_op_lock(rbd_dev, RBD_NOTIFY_OP_REQUEST_LOCK, |
| &reply_pages, &reply_len); |
| if (ret && ret != -ETIMEDOUT) { |
| rbd_warn(rbd_dev, "failed to request lock: %d", ret); |
| goto out; |
| } |
| |
| if (reply_len > 0 && reply_len <= PAGE_SIZE) { |
| void *p = page_address(reply_pages[0]); |
| void *const end = p + reply_len; |
| u32 n; |
| |
| ceph_decode_32_safe(&p, end, n, e_inval); /* num_acks */ |
| while (n--) { |
| u8 struct_v; |
| u32 len; |
| |
| ceph_decode_need(&p, end, 8 + 8, e_inval); |
| p += 8 + 8; /* skip gid and cookie */ |
| |
| ceph_decode_32_safe(&p, end, len, e_inval); |
| if (!len) |
| continue; |
| |
| if (lock_owner_responded) { |
| rbd_warn(rbd_dev, |
| "duplicate lock owners detected"); |
| ret = -EIO; |
| goto out; |
| } |
| |
| lock_owner_responded = true; |
| ret = ceph_start_decoding(&p, end, 1, "ResponseMessage", |
| &struct_v, &len); |
| if (ret) { |
| rbd_warn(rbd_dev, |
| "failed to decode ResponseMessage: %d", |
| ret); |
| goto e_inval; |
| } |
| |
| ret = ceph_decode_32(&p); |
| } |
| } |
| |
| if (!lock_owner_responded) { |
| rbd_warn(rbd_dev, "no lock owners detected"); |
| ret = -ETIMEDOUT; |
| } |
| |
| out: |
| ceph_release_page_vector(reply_pages, calc_pages_for(0, reply_len)); |
| return ret; |
| |
| e_inval: |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| static void wake_requests(struct rbd_device *rbd_dev, bool wake_all) |
| { |
| dout("%s rbd_dev %p wake_all %d\n", __func__, rbd_dev, wake_all); |
| |
| cancel_delayed_work(&rbd_dev->lock_dwork); |
| if (wake_all) |
| wake_up_all(&rbd_dev->lock_waitq); |
| else |
| wake_up(&rbd_dev->lock_waitq); |
| } |
| |
| static int get_lock_owner_info(struct rbd_device *rbd_dev, |
| struct ceph_locker **lockers, u32 *num_lockers) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| u8 lock_type; |
| char *lock_tag; |
| int ret; |
| |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| ret = ceph_cls_lock_info(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| &lock_type, &lock_tag, lockers, num_lockers); |
| if (ret) |
| return ret; |
| |
| if (*num_lockers == 0) { |
| dout("%s rbd_dev %p no lockers detected\n", __func__, rbd_dev); |
| goto out; |
| } |
| |
| if (strcmp(lock_tag, RBD_LOCK_TAG)) { |
| rbd_warn(rbd_dev, "locked by external mechanism, tag %s", |
| lock_tag); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| if (lock_type == CEPH_CLS_LOCK_SHARED) { |
| rbd_warn(rbd_dev, "shared lock type detected"); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| if (strncmp((*lockers)[0].id.cookie, RBD_LOCK_COOKIE_PREFIX, |
| strlen(RBD_LOCK_COOKIE_PREFIX))) { |
| rbd_warn(rbd_dev, "locked by external mechanism, cookie %s", |
| (*lockers)[0].id.cookie); |
| ret = -EBUSY; |
| goto out; |
| } |
| |
| out: |
| kfree(lock_tag); |
| return ret; |
| } |
| |
| static int find_watcher(struct rbd_device *rbd_dev, |
| const struct ceph_locker *locker) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct ceph_watch_item *watchers; |
| u32 num_watchers; |
| u64 cookie; |
| int i; |
| int ret; |
| |
| ret = ceph_osdc_list_watchers(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, &watchers, |
| &num_watchers); |
| if (ret) |
| return ret; |
| |
| sscanf(locker->id.cookie, RBD_LOCK_COOKIE_PREFIX " %llu", &cookie); |
| for (i = 0; i < num_watchers; i++) { |
| if (!memcmp(&watchers[i].addr, &locker->info.addr, |
| sizeof(locker->info.addr)) && |
| watchers[i].cookie == cookie) { |
| struct rbd_client_id cid = { |
| .gid = le64_to_cpu(watchers[i].name.num), |
| .handle = cookie, |
| }; |
| |
| dout("%s rbd_dev %p found cid %llu-%llu\n", __func__, |
| rbd_dev, cid.gid, cid.handle); |
| rbd_set_owner_cid(rbd_dev, &cid); |
| ret = 1; |
| goto out; |
| } |
| } |
| |
| dout("%s rbd_dev %p no watchers\n", __func__, rbd_dev); |
| ret = 0; |
| out: |
| kfree(watchers); |
| return ret; |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static int rbd_try_lock(struct rbd_device *rbd_dev) |
| { |
| struct ceph_client *client = rbd_dev->rbd_client->client; |
| struct ceph_locker *lockers; |
| u32 num_lockers; |
| int ret; |
| |
| for (;;) { |
| ret = rbd_lock(rbd_dev); |
| if (ret != -EBUSY) |
| return ret; |
| |
| /* determine if the current lock holder is still alive */ |
| ret = get_lock_owner_info(rbd_dev, &lockers, &num_lockers); |
| if (ret) |
| return ret; |
| |
| if (num_lockers == 0) |
| goto again; |
| |
| ret = find_watcher(rbd_dev, lockers); |
| if (ret) { |
| if (ret > 0) |
| ret = 0; /* have to request lock */ |
| goto out; |
| } |
| |
| rbd_warn(rbd_dev, "%s%llu seems dead, breaking lock", |
| ENTITY_NAME(lockers[0].id.name)); |
| |
| ret = ceph_monc_blacklist_add(&client->monc, |
| &lockers[0].info.addr); |
| if (ret) { |
| rbd_warn(rbd_dev, "blacklist of %s%llu failed: %d", |
| ENTITY_NAME(lockers[0].id.name), ret); |
| goto out; |
| } |
| |
| ret = ceph_cls_break_lock(&client->osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| lockers[0].id.cookie, |
| &lockers[0].id.name); |
| if (ret && ret != -ENOENT) |
| goto out; |
| |
| again: |
| ceph_free_lockers(lockers, num_lockers); |
| } |
| |
| out: |
| ceph_free_lockers(lockers, num_lockers); |
| return ret; |
| } |
| |
| /* |
| * ret is set only if lock_state is RBD_LOCK_STATE_UNLOCKED |
| */ |
| static enum rbd_lock_state rbd_try_acquire_lock(struct rbd_device *rbd_dev, |
| int *pret) |
| { |
| enum rbd_lock_state lock_state; |
| |
| down_read(&rbd_dev->lock_rwsem); |
| dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, |
| rbd_dev->lock_state); |
| if (__rbd_is_lock_owner(rbd_dev)) { |
| lock_state = rbd_dev->lock_state; |
| up_read(&rbd_dev->lock_rwsem); |
| return lock_state; |
| } |
| |
| up_read(&rbd_dev->lock_rwsem); |
| down_write(&rbd_dev->lock_rwsem); |
| dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, |
| rbd_dev->lock_state); |
| if (!__rbd_is_lock_owner(rbd_dev)) { |
| *pret = rbd_try_lock(rbd_dev); |
| if (*pret) |
| rbd_warn(rbd_dev, "failed to acquire lock: %d", *pret); |
| } |
| |
| lock_state = rbd_dev->lock_state; |
| up_write(&rbd_dev->lock_rwsem); |
| return lock_state; |
| } |
| |
| static void rbd_acquire_lock(struct work_struct *work) |
| { |
| struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
| struct rbd_device, lock_dwork); |
| enum rbd_lock_state lock_state; |
| int ret = 0; |
| |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| again: |
| lock_state = rbd_try_acquire_lock(rbd_dev, &ret); |
| if (lock_state != RBD_LOCK_STATE_UNLOCKED || ret == -EBLACKLISTED) { |
| if (lock_state == RBD_LOCK_STATE_LOCKED) |
| wake_requests(rbd_dev, true); |
| dout("%s rbd_dev %p lock_state %d ret %d - done\n", __func__, |
| rbd_dev, lock_state, ret); |
| return; |
| } |
| |
| ret = rbd_request_lock(rbd_dev); |
| if (ret == -ETIMEDOUT) { |
| goto again; /* treat this as a dead client */ |
| } else if (ret == -EROFS) { |
| rbd_warn(rbd_dev, "peer will not release lock"); |
| /* |
| * If this is rbd_add_acquire_lock(), we want to fail |
| * immediately -- reuse BLACKLISTED flag. Otherwise we |
| * want to block. |
| */ |
| if (!(rbd_dev->disk->flags & GENHD_FL_UP)) { |
| set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
| /* wake "rbd map --exclusive" process */ |
| wake_requests(rbd_dev, false); |
| } |
| } else if (ret < 0) { |
| rbd_warn(rbd_dev, "error requesting lock: %d", ret); |
| mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
| RBD_RETRY_DELAY); |
| } else { |
| /* |
| * lock owner acked, but resend if we don't see them |
| * release the lock |
| */ |
| dout("%s rbd_dev %p requeueing lock_dwork\n", __func__, |
| rbd_dev); |
| mod_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, |
| msecs_to_jiffies(2 * RBD_NOTIFY_TIMEOUT * MSEC_PER_SEC)); |
| } |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static bool rbd_release_lock(struct rbd_device *rbd_dev) |
| { |
| dout("%s rbd_dev %p read lock_state %d\n", __func__, rbd_dev, |
| rbd_dev->lock_state); |
| if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED) |
| return false; |
| |
| rbd_dev->lock_state = RBD_LOCK_STATE_RELEASING; |
| downgrade_write(&rbd_dev->lock_rwsem); |
| /* |
| * Ensure that all in-flight IO is flushed. |
| * |
| * FIXME: ceph_osdc_sync() flushes the entire OSD client, which |
| * may be shared with other devices. |
| */ |
| ceph_osdc_sync(&rbd_dev->rbd_client->client->osdc); |
| up_read(&rbd_dev->lock_rwsem); |
| |
| down_write(&rbd_dev->lock_rwsem); |
| dout("%s rbd_dev %p write lock_state %d\n", __func__, rbd_dev, |
| rbd_dev->lock_state); |
| if (rbd_dev->lock_state != RBD_LOCK_STATE_RELEASING) |
| return false; |
| |
| rbd_unlock(rbd_dev); |
| /* |
| * Give others a chance to grab the lock - we would re-acquire |
| * almost immediately if we got new IO during ceph_osdc_sync() |
| * otherwise. We need to ack our own notifications, so this |
| * lock_dwork will be requeued from rbd_wait_state_locked() |
| * after wake_requests() in rbd_handle_released_lock(). |
| */ |
| cancel_delayed_work(&rbd_dev->lock_dwork); |
| return true; |
| } |
| |
| static void rbd_release_lock_work(struct work_struct *work) |
| { |
| struct rbd_device *rbd_dev = container_of(work, struct rbd_device, |
| unlock_work); |
| |
| down_write(&rbd_dev->lock_rwsem); |
| rbd_release_lock(rbd_dev); |
| up_write(&rbd_dev->lock_rwsem); |
| } |
| |
| static void rbd_handle_acquired_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| void **p) |
| { |
| struct rbd_client_id cid = { 0 }; |
| |
| if (struct_v >= 2) { |
| cid.gid = ceph_decode_64(p); |
| cid.handle = ceph_decode_64(p); |
| } |
| |
| dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| cid.handle); |
| if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
| down_write(&rbd_dev->lock_rwsem); |
| if (rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
| /* |
| * we already know that the remote client is |
| * the owner |
| */ |
| up_write(&rbd_dev->lock_rwsem); |
| return; |
| } |
| |
| rbd_set_owner_cid(rbd_dev, &cid); |
| downgrade_write(&rbd_dev->lock_rwsem); |
| } else { |
| down_read(&rbd_dev->lock_rwsem); |
| } |
| |
| if (!__rbd_is_lock_owner(rbd_dev)) |
| wake_requests(rbd_dev, false); |
| up_read(&rbd_dev->lock_rwsem); |
| } |
| |
| static void rbd_handle_released_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| void **p) |
| { |
| struct rbd_client_id cid = { 0 }; |
| |
| if (struct_v >= 2) { |
| cid.gid = ceph_decode_64(p); |
| cid.handle = ceph_decode_64(p); |
| } |
| |
| dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| cid.handle); |
| if (!rbd_cid_equal(&cid, &rbd_empty_cid)) { |
| down_write(&rbd_dev->lock_rwsem); |
| if (!rbd_cid_equal(&cid, &rbd_dev->owner_cid)) { |
| dout("%s rbd_dev %p unexpected owner, cid %llu-%llu != owner_cid %llu-%llu\n", |
| __func__, rbd_dev, cid.gid, cid.handle, |
| rbd_dev->owner_cid.gid, rbd_dev->owner_cid.handle); |
| up_write(&rbd_dev->lock_rwsem); |
| return; |
| } |
| |
| rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| downgrade_write(&rbd_dev->lock_rwsem); |
| } else { |
| down_read(&rbd_dev->lock_rwsem); |
| } |
| |
| if (!__rbd_is_lock_owner(rbd_dev)) |
| wake_requests(rbd_dev, false); |
| up_read(&rbd_dev->lock_rwsem); |
| } |
| |
| /* |
| * Returns result for ResponseMessage to be encoded (<= 0), or 1 if no |
| * ResponseMessage is needed. |
| */ |
| static int rbd_handle_request_lock(struct rbd_device *rbd_dev, u8 struct_v, |
| void **p) |
| { |
| struct rbd_client_id my_cid = rbd_get_cid(rbd_dev); |
| struct rbd_client_id cid = { 0 }; |
| int result = 1; |
| |
| if (struct_v >= 2) { |
| cid.gid = ceph_decode_64(p); |
| cid.handle = ceph_decode_64(p); |
| } |
| |
| dout("%s rbd_dev %p cid %llu-%llu\n", __func__, rbd_dev, cid.gid, |
| cid.handle); |
| if (rbd_cid_equal(&cid, &my_cid)) |
| return result; |
| |
| down_read(&rbd_dev->lock_rwsem); |
| if (__rbd_is_lock_owner(rbd_dev)) { |
| if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED && |
| rbd_cid_equal(&rbd_dev->owner_cid, &rbd_empty_cid)) |
| goto out_unlock; |
| |
| /* |
| * encode ResponseMessage(0) so the peer can detect |
| * a missing owner |
| */ |
| result = 0; |
| |
| if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) { |
| if (!rbd_dev->opts->exclusive) { |
| dout("%s rbd_dev %p queueing unlock_work\n", |
| __func__, rbd_dev); |
| queue_work(rbd_dev->task_wq, |
| &rbd_dev->unlock_work); |
| } else { |
| /* refuse to release the lock */ |
| result = -EROFS; |
| } |
| } |
| } |
| |
| out_unlock: |
| up_read(&rbd_dev->lock_rwsem); |
| return result; |
| } |
| |
| static void __rbd_acknowledge_notify(struct rbd_device *rbd_dev, |
| u64 notify_id, u64 cookie, s32 *result) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| int buf_size = 4 + CEPH_ENCODING_START_BLK_LEN; |
| char buf[buf_size]; |
| int ret; |
| |
| if (result) { |
| void *p = buf; |
| |
| /* encode ResponseMessage */ |
| ceph_start_encoding(&p, 1, 1, |
| buf_size - CEPH_ENCODING_START_BLK_LEN); |
| ceph_encode_32(&p, *result); |
| } else { |
| buf_size = 0; |
| } |
| |
| ret = ceph_osdc_notify_ack(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, notify_id, cookie, |
| buf, buf_size); |
| if (ret) |
| rbd_warn(rbd_dev, "acknowledge_notify failed: %d", ret); |
| } |
| |
| static void rbd_acknowledge_notify(struct rbd_device *rbd_dev, u64 notify_id, |
| u64 cookie) |
| { |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, NULL); |
| } |
| |
| static void rbd_acknowledge_notify_result(struct rbd_device *rbd_dev, |
| u64 notify_id, u64 cookie, s32 result) |
| { |
| dout("%s rbd_dev %p result %d\n", __func__, rbd_dev, result); |
| __rbd_acknowledge_notify(rbd_dev, notify_id, cookie, &result); |
| } |
| |
| static void rbd_watch_cb(void *arg, u64 notify_id, u64 cookie, |
| u64 notifier_id, void *data, size_t data_len) |
| { |
| struct rbd_device *rbd_dev = arg; |
| void *p = data; |
| void *const end = p + data_len; |
| u8 struct_v = 0; |
| u32 len; |
| u32 notify_op; |
| int ret; |
| |
| dout("%s rbd_dev %p cookie %llu notify_id %llu data_len %zu\n", |
| __func__, rbd_dev, cookie, notify_id, data_len); |
| if (data_len) { |
| ret = ceph_start_decoding(&p, end, 1, "NotifyMessage", |
| &struct_v, &len); |
| if (ret) { |
| rbd_warn(rbd_dev, "failed to decode NotifyMessage: %d", |
| ret); |
| return; |
| } |
| |
| notify_op = ceph_decode_32(&p); |
| } else { |
| /* legacy notification for header updates */ |
| notify_op = RBD_NOTIFY_OP_HEADER_UPDATE; |
| len = 0; |
| } |
| |
| dout("%s rbd_dev %p notify_op %u\n", __func__, rbd_dev, notify_op); |
| switch (notify_op) { |
| case RBD_NOTIFY_OP_ACQUIRED_LOCK: |
| rbd_handle_acquired_lock(rbd_dev, struct_v, &p); |
| rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| break; |
| case RBD_NOTIFY_OP_RELEASED_LOCK: |
| rbd_handle_released_lock(rbd_dev, struct_v, &p); |
| rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| break; |
| case RBD_NOTIFY_OP_REQUEST_LOCK: |
| ret = rbd_handle_request_lock(rbd_dev, struct_v, &p); |
| if (ret <= 0) |
| rbd_acknowledge_notify_result(rbd_dev, notify_id, |
| cookie, ret); |
| else |
| rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| break; |
| case RBD_NOTIFY_OP_HEADER_UPDATE: |
| ret = rbd_dev_refresh(rbd_dev); |
| if (ret) |
| rbd_warn(rbd_dev, "refresh failed: %d", ret); |
| |
| rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| break; |
| default: |
| if (rbd_is_lock_owner(rbd_dev)) |
| rbd_acknowledge_notify_result(rbd_dev, notify_id, |
| cookie, -EOPNOTSUPP); |
| else |
| rbd_acknowledge_notify(rbd_dev, notify_id, cookie); |
| break; |
| } |
| } |
| |
| static void __rbd_unregister_watch(struct rbd_device *rbd_dev); |
| |
| static void rbd_watch_errcb(void *arg, u64 cookie, int err) |
| { |
| struct rbd_device *rbd_dev = arg; |
| |
| rbd_warn(rbd_dev, "encountered watch error: %d", err); |
| |
| down_write(&rbd_dev->lock_rwsem); |
| rbd_set_owner_cid(rbd_dev, &rbd_empty_cid); |
| up_write(&rbd_dev->lock_rwsem); |
| |
| mutex_lock(&rbd_dev->watch_mutex); |
| if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) { |
| __rbd_unregister_watch(rbd_dev); |
| rbd_dev->watch_state = RBD_WATCH_STATE_ERROR; |
| |
| queue_delayed_work(rbd_dev->task_wq, &rbd_dev->watch_dwork, 0); |
| } |
| mutex_unlock(&rbd_dev->watch_mutex); |
| } |
| |
| /* |
| * watch_mutex must be locked |
| */ |
| static int __rbd_register_watch(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct ceph_osd_linger_request *handle; |
| |
| rbd_assert(!rbd_dev->watch_handle); |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| handle = ceph_osdc_watch(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, rbd_watch_cb, |
| rbd_watch_errcb, rbd_dev); |
| if (IS_ERR(handle)) |
| return PTR_ERR(handle); |
| |
| rbd_dev->watch_handle = handle; |
| return 0; |
| } |
| |
| /* |
| * watch_mutex must be locked |
| */ |
| static void __rbd_unregister_watch(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| int ret; |
| |
| rbd_assert(rbd_dev->watch_handle); |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| ret = ceph_osdc_unwatch(osdc, rbd_dev->watch_handle); |
| if (ret) |
| rbd_warn(rbd_dev, "failed to unwatch: %d", ret); |
| |
| rbd_dev->watch_handle = NULL; |
| } |
| |
| static int rbd_register_watch(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| mutex_lock(&rbd_dev->watch_mutex); |
| rbd_assert(rbd_dev->watch_state == RBD_WATCH_STATE_UNREGISTERED); |
| ret = __rbd_register_watch(rbd_dev); |
| if (ret) |
| goto out; |
| |
| rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
| rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
| |
| out: |
| mutex_unlock(&rbd_dev->watch_mutex); |
| return ret; |
| } |
| |
| static void cancel_tasks_sync(struct rbd_device *rbd_dev) |
| { |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| cancel_delayed_work_sync(&rbd_dev->watch_dwork); |
| cancel_work_sync(&rbd_dev->acquired_lock_work); |
| cancel_work_sync(&rbd_dev->released_lock_work); |
| cancel_delayed_work_sync(&rbd_dev->lock_dwork); |
| cancel_work_sync(&rbd_dev->unlock_work); |
| } |
| |
| static void rbd_unregister_watch(struct rbd_device *rbd_dev) |
| { |
| WARN_ON(waitqueue_active(&rbd_dev->lock_waitq)); |
| cancel_tasks_sync(rbd_dev); |
| |
| mutex_lock(&rbd_dev->watch_mutex); |
| if (rbd_dev->watch_state == RBD_WATCH_STATE_REGISTERED) |
| __rbd_unregister_watch(rbd_dev); |
| rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
| mutex_unlock(&rbd_dev->watch_mutex); |
| |
| ceph_osdc_flush_notifies(&rbd_dev->rbd_client->client->osdc); |
| } |
| |
| /* |
| * lock_rwsem must be held for write |
| */ |
| static void rbd_reacquire_lock(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| char cookie[32]; |
| int ret; |
| |
| WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED); |
| |
| format_lock_cookie(rbd_dev, cookie); |
| ret = ceph_cls_set_cookie(osdc, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, RBD_LOCK_NAME, |
| CEPH_CLS_LOCK_EXCLUSIVE, rbd_dev->lock_cookie, |
| RBD_LOCK_TAG, cookie); |
| if (ret) { |
| if (ret != -EOPNOTSUPP) |
| rbd_warn(rbd_dev, "failed to update lock cookie: %d", |
| ret); |
| |
| /* |
| * Lock cookie cannot be updated on older OSDs, so do |
| * a manual release and queue an acquire. |
| */ |
| if (rbd_release_lock(rbd_dev)) |
| queue_delayed_work(rbd_dev->task_wq, |
| &rbd_dev->lock_dwork, 0); |
| } else { |
| strcpy(rbd_dev->lock_cookie, cookie); |
| } |
| } |
| |
| static void rbd_reregister_watch(struct work_struct *work) |
| { |
| struct rbd_device *rbd_dev = container_of(to_delayed_work(work), |
| struct rbd_device, watch_dwork); |
| int ret; |
| |
| dout("%s rbd_dev %p\n", __func__, rbd_dev); |
| |
| mutex_lock(&rbd_dev->watch_mutex); |
| if (rbd_dev->watch_state != RBD_WATCH_STATE_ERROR) { |
| mutex_unlock(&rbd_dev->watch_mutex); |
| return; |
| } |
| |
| ret = __rbd_register_watch(rbd_dev); |
| if (ret) { |
| rbd_warn(rbd_dev, "failed to reregister watch: %d", ret); |
| if (ret == -EBLACKLISTED || ret == -ENOENT) { |
| set_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags); |
| wake_requests(rbd_dev, true); |
| } else { |
| queue_delayed_work(rbd_dev->task_wq, |
| &rbd_dev->watch_dwork, |
| RBD_RETRY_DELAY); |
| } |
| mutex_unlock(&rbd_dev->watch_mutex); |
| return; |
| } |
| |
| rbd_dev->watch_state = RBD_WATCH_STATE_REGISTERED; |
| rbd_dev->watch_cookie = rbd_dev->watch_handle->linger_id; |
| mutex_unlock(&rbd_dev->watch_mutex); |
| |
| down_write(&rbd_dev->lock_rwsem); |
| if (rbd_dev->lock_state == RBD_LOCK_STATE_LOCKED) |
| rbd_reacquire_lock(rbd_dev); |
| up_write(&rbd_dev->lock_rwsem); |
| |
| ret = rbd_dev_refresh(rbd_dev); |
| if (ret) |
| rbd_warn(rbd_dev, "reregisteration refresh failed: %d", ret); |
| } |
| |
| /* |
| * Synchronous osd object method call. Returns the number of bytes |
| * returned in the outbound buffer, or a negative error code. |
| */ |
| static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
| struct ceph_object_id *oid, |
| struct ceph_object_locator *oloc, |
| const char *method_name, |
| const void *outbound, |
| size_t outbound_size, |
| void *inbound, |
| size_t inbound_size) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct page *req_page = NULL; |
| struct page *reply_page; |
| int ret; |
| |
| /* |
| * Method calls are ultimately read operations. The result |
| * should placed into the inbound buffer provided. They |
| * also supply outbound data--parameters for the object |
| * method. Currently if this is present it will be a |
| * snapshot id. |
| */ |
| if (outbound) { |
| if (outbound_size > PAGE_SIZE) |
| return -E2BIG; |
| |
| req_page = alloc_page(GFP_KERNEL); |
| if (!req_page) |
| return -ENOMEM; |
| |
| memcpy(page_address(req_page), outbound, outbound_size); |
| } |
| |
| reply_page = alloc_page(GFP_KERNEL); |
| if (!reply_page) { |
| if (req_page) |
| __free_page(req_page); |
| return -ENOMEM; |
| } |
| |
| ret = ceph_osdc_call(osdc, oid, oloc, RBD_DRV_NAME, method_name, |
| CEPH_OSD_FLAG_READ, req_page, outbound_size, |
| reply_page, &inbound_size); |
| if (!ret) { |
| memcpy(inbound, page_address(reply_page), inbound_size); |
| ret = inbound_size; |
| } |
| |
| if (req_page) |
| __free_page(req_page); |
| __free_page(reply_page); |
| return ret; |
| } |
| |
| /* |
| * lock_rwsem must be held for read |
| */ |
| static void rbd_wait_state_locked(struct rbd_device *rbd_dev) |
| { |
| DEFINE_WAIT(wait); |
| |
| do { |
| /* |
| * Note the use of mod_delayed_work() in rbd_acquire_lock() |
| * and cancel_delayed_work() in wake_requests(). |
| */ |
| dout("%s rbd_dev %p queueing lock_dwork\n", __func__, rbd_dev); |
| queue_delayed_work(rbd_dev->task_wq, &rbd_dev->lock_dwork, 0); |
| prepare_to_wait_exclusive(&rbd_dev->lock_waitq, &wait, |
| TASK_UNINTERRUPTIBLE); |
| up_read(&rbd_dev->lock_rwsem); |
| schedule(); |
| down_read(&rbd_dev->lock_rwsem); |
| } while (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
| !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)); |
| |
| finish_wait(&rbd_dev->lock_waitq, &wait); |
| } |
| |
| static void rbd_queue_workfn(struct work_struct *work) |
| { |
| struct request *rq = blk_mq_rq_from_pdu(work); |
| struct rbd_device *rbd_dev = rq->q->queuedata; |
| struct rbd_img_request *img_request; |
| struct ceph_snap_context *snapc = NULL; |
| u64 offset = (u64)blk_rq_pos(rq) << SECTOR_SHIFT; |
| u64 length = blk_rq_bytes(rq); |
| enum obj_operation_type op_type; |
| u64 mapping_size; |
| bool must_be_locked; |
| int result; |
| |
| switch (req_op(rq)) { |
| case REQ_OP_DISCARD: |
| case REQ_OP_WRITE_ZEROES: |
| op_type = OBJ_OP_DISCARD; |
| break; |
| case REQ_OP_WRITE: |
| op_type = OBJ_OP_WRITE; |
| break; |
| case REQ_OP_READ: |
| op_type = OBJ_OP_READ; |
| break; |
| default: |
| dout("%s: non-fs request type %d\n", __func__, req_op(rq)); |
| result = -EIO; |
| goto err; |
| } |
| |
| /* Ignore/skip any zero-length requests */ |
| |
| if (!length) { |
| dout("%s: zero-length request\n", __func__); |
| result = 0; |
| goto err_rq; |
| } |
| |
| /* Only reads are allowed to a read-only device */ |
| |
| if (op_type != OBJ_OP_READ) { |
| if (rbd_dev->mapping.read_only) { |
| result = -EROFS; |
| goto err_rq; |
| } |
| rbd_assert(rbd_dev->spec->snap_id == CEPH_NOSNAP); |
| } |
| |
| /* |
| * Quit early if the mapped snapshot no longer exists. It's |
| * still possible the snapshot will have disappeared by the |
| * time our request arrives at the osd, but there's no sense in |
| * sending it if we already know. |
| */ |
| if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) { |
| dout("request for non-existent snapshot"); |
| rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); |
| result = -ENXIO; |
| goto err_rq; |
| } |
| |
| if (offset && length > U64_MAX - offset + 1) { |
| rbd_warn(rbd_dev, "bad request range (%llu~%llu)", offset, |
| length); |
| result = -EINVAL; |
| goto err_rq; /* Shouldn't happen */ |
| } |
| |
| blk_mq_start_request(rq); |
| |
| down_read(&rbd_dev->header_rwsem); |
| mapping_size = rbd_dev->mapping.size; |
| if (op_type != OBJ_OP_READ) { |
| snapc = rbd_dev->header.snapc; |
| ceph_get_snap_context(snapc); |
| } |
| up_read(&rbd_dev->header_rwsem); |
| |
| if (offset + length > mapping_size) { |
| rbd_warn(rbd_dev, "beyond EOD (%llu~%llu > %llu)", offset, |
| length, mapping_size); |
| result = -EIO; |
| goto err_rq; |
| } |
| |
| must_be_locked = |
| (rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK) && |
| (op_type != OBJ_OP_READ || rbd_dev->opts->lock_on_read); |
| if (must_be_locked) { |
| down_read(&rbd_dev->lock_rwsem); |
| if (rbd_dev->lock_state != RBD_LOCK_STATE_LOCKED && |
| !test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
| if (rbd_dev->opts->exclusive) { |
| rbd_warn(rbd_dev, "exclusive lock required"); |
| result = -EROFS; |
| goto err_unlock; |
| } |
| rbd_wait_state_locked(rbd_dev); |
| } |
| if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
| result = -EBLACKLISTED; |
| goto err_unlock; |
| } |
| } |
| |
| img_request = rbd_img_request_create(rbd_dev, offset, length, op_type, |
| snapc); |
| if (!img_request) { |
| result = -ENOMEM; |
| goto err_unlock; |
| } |
| img_request->rq = rq; |
| snapc = NULL; /* img_request consumes a ref */ |
| |
| if (op_type == OBJ_OP_DISCARD) |
| result = rbd_img_request_fill(img_request, OBJ_REQUEST_NODATA, |
| NULL); |
| else |
| result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, |
| rq->bio); |
| if (result) |
| goto err_img_request; |
| |
| result = rbd_img_request_submit(img_request); |
| if (result) |
| goto err_img_request; |
| |
| if (must_be_locked) |
| up_read(&rbd_dev->lock_rwsem); |
| return; |
| |
| err_img_request: |
| rbd_img_request_put(img_request); |
| err_unlock: |
| if (must_be_locked) |
| up_read(&rbd_dev->lock_rwsem); |
| err_rq: |
| if (result) |
| rbd_warn(rbd_dev, "%s %llx at %llx result %d", |
| obj_op_name(op_type), length, offset, result); |
| ceph_put_snap_context(snapc); |
| err: |
| blk_mq_end_request(rq, errno_to_blk_status(result)); |
| } |
| |
| static blk_status_t rbd_queue_rq(struct blk_mq_hw_ctx *hctx, |
| const struct blk_mq_queue_data *bd) |
| { |
| struct request *rq = bd->rq; |
| struct work_struct *work = blk_mq_rq_to_pdu(rq); |
| |
| queue_work(rbd_wq, work); |
| return BLK_STS_OK; |
| } |
| |
| static void rbd_free_disk(struct rbd_device *rbd_dev) |
| { |
| blk_cleanup_queue(rbd_dev->disk->queue); |
| blk_mq_free_tag_set(&rbd_dev->tag_set); |
| put_disk(rbd_dev->disk); |
| rbd_dev->disk = NULL; |
| } |
| |
| static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
| struct ceph_object_id *oid, |
| struct ceph_object_locator *oloc, |
| void *buf, int buf_len) |
| |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct ceph_osd_request *req; |
| struct page **pages; |
| int num_pages = calc_pages_for(0, buf_len); |
| int ret; |
| |
| req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_KERNEL); |
| if (!req) |
| return -ENOMEM; |
| |
| ceph_oid_copy(&req->r_base_oid, oid); |
| ceph_oloc_copy(&req->r_base_oloc, oloc); |
| req->r_flags = CEPH_OSD_FLAG_READ; |
| |
| ret = ceph_osdc_alloc_messages(req, GFP_KERNEL); |
| if (ret) |
| goto out_req; |
| |
| pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); |
| if (IS_ERR(pages)) { |
| ret = PTR_ERR(pages); |
| goto out_req; |
| } |
| |
| osd_req_op_extent_init(req, 0, CEPH_OSD_OP_READ, 0, buf_len, 0, 0); |
| osd_req_op_extent_osd_data_pages(req, 0, pages, buf_len, 0, false, |
| true); |
| |
| ceph_osdc_start_request(osdc, req, false); |
| ret = ceph_osdc_wait_request(osdc, req); |
| if (ret >= 0) |
| ceph_copy_from_page_vector(pages, buf, 0, ret); |
| |
| out_req: |
| ceph_osdc_put_request(req); |
| return ret; |
| } |
| |
| /* |
| * Read the complete header for the given rbd device. On successful |
| * return, the rbd_dev->header field will contain up-to-date |
| * information about the image. |
| */ |
| static int rbd_dev_v1_header_info(struct rbd_device *rbd_dev) |
| { |
| struct rbd_image_header_ondisk *ondisk = NULL; |
| u32 snap_count = 0; |
| u64 names_size = 0; |
| u32 want_count; |
| int ret; |
| |
| /* |
| * The complete header will include an array of its 64-bit |
| * snapshot ids, followed by the names of those snapshots as |
| * a contiguous block of NUL-terminated strings. Note that |
| * the number of snapshots could change by the time we read |
| * it in, in which case we re-read it. |
| */ |
| do { |
| size_t size; |
| |
| kfree(ondisk); |
| |
| size = sizeof (*ondisk); |
| size += snap_count * sizeof (struct rbd_image_snap_ondisk); |
| size += names_size; |
| ondisk = kmalloc(size, GFP_KERNEL); |
| if (!ondisk) |
| return -ENOMEM; |
| |
| ret = rbd_obj_read_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, ondisk, size); |
| if (ret < 0) |
| goto out; |
| if ((size_t)ret < size) { |
| ret = -ENXIO; |
| rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
| size, ret); |
| goto out; |
| } |
| if (!rbd_dev_ondisk_valid(ondisk)) { |
| ret = -ENXIO; |
| rbd_warn(rbd_dev, "invalid header"); |
| goto out; |
| } |
| |
| names_size = le64_to_cpu(ondisk->snap_names_len); |
| want_count = snap_count; |
| snap_count = le32_to_cpu(ondisk->snap_count); |
| } while (snap_count != want_count); |
| |
| ret = rbd_header_from_disk(rbd_dev, ondisk); |
| out: |
| kfree(ondisk); |
| |
| return ret; |
| } |
| |
| /* |
| * Clear the rbd device's EXISTS flag if the snapshot it's mapped to |
| * has disappeared from the (just updated) snapshot context. |
| */ |
| static void rbd_exists_validate(struct rbd_device *rbd_dev) |
| { |
| u64 snap_id; |
| |
| if (!test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags)) |
| return; |
| |
| snap_id = rbd_dev->spec->snap_id; |
| if (snap_id == CEPH_NOSNAP) |
| return; |
| |
| if (rbd_dev_snap_index(rbd_dev, snap_id) == BAD_SNAP_INDEX) |
| clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| } |
| |
| static void rbd_dev_update_size(struct rbd_device *rbd_dev) |
| { |
| sector_t size; |
| |
| /* |
| * If EXISTS is not set, rbd_dev->disk may be NULL, so don't |
| * try to update its size. If REMOVING is set, updating size |
| * is just useless work since the device can't be opened. |
| */ |
| if (test_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags) && |
| !test_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags)) { |
| size = (sector_t)rbd_dev->mapping.size / SECTOR_SIZE; |
| dout("setting size to %llu sectors", (unsigned long long)size); |
| set_capacity(rbd_dev->disk, size); |
| revalidate_disk(rbd_dev->disk); |
| } |
| } |
| |
| static int rbd_dev_refresh(struct rbd_device *rbd_dev) |
| { |
| u64 mapping_size; |
| int ret; |
| |
| down_write(&rbd_dev->header_rwsem); |
| mapping_size = rbd_dev->mapping.size; |
| |
| ret = rbd_dev_header_info(rbd_dev); |
| if (ret) |
| goto out; |
| |
| /* |
| * If there is a parent, see if it has disappeared due to the |
| * mapped image getting flattened. |
| */ |
| if (rbd_dev->parent) { |
| ret = rbd_dev_v2_parent_info(rbd_dev); |
| if (ret) |
| goto out; |
| } |
| |
| if (rbd_dev->spec->snap_id == CEPH_NOSNAP) { |
| rbd_dev->mapping.size = rbd_dev->header.image_size; |
| } else { |
| /* validate mapped snapshot's EXISTS flag */ |
| rbd_exists_validate(rbd_dev); |
| } |
| |
| out: |
| up_write(&rbd_dev->header_rwsem); |
| if (!ret && mapping_size != rbd_dev->mapping.size) |
| rbd_dev_update_size(rbd_dev); |
| |
| return ret; |
| } |
| |
| static int rbd_init_request(struct blk_mq_tag_set *set, struct request *rq, |
| unsigned int hctx_idx, unsigned int numa_node) |
| { |
| struct work_struct *work = blk_mq_rq_to_pdu(rq); |
| |
| INIT_WORK(work, rbd_queue_workfn); |
| return 0; |
| } |
| |
| static const struct blk_mq_ops rbd_mq_ops = { |
| .queue_rq = rbd_queue_rq, |
| .init_request = rbd_init_request, |
| }; |
| |
| static int rbd_init_disk(struct rbd_device *rbd_dev) |
| { |
| struct gendisk *disk; |
| struct request_queue *q; |
| u64 segment_size; |
| int err; |
| |
| /* create gendisk info */ |
| disk = alloc_disk(single_major ? |
| (1 << RBD_SINGLE_MAJOR_PART_SHIFT) : |
| RBD_MINORS_PER_MAJOR); |
| if (!disk) |
| return -ENOMEM; |
| |
| snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", |
| rbd_dev->dev_id); |
| disk->major = rbd_dev->major; |
| disk->first_minor = rbd_dev->minor; |
| if (single_major) |
| disk->flags |= GENHD_FL_EXT_DEVT; |
| disk->fops = &rbd_bd_ops; |
| disk->private_data = rbd_dev; |
| |
| memset(&rbd_dev->tag_set, 0, sizeof(rbd_dev->tag_set)); |
| rbd_dev->tag_set.ops = &rbd_mq_ops; |
| rbd_dev->tag_set.queue_depth = rbd_dev->opts->queue_depth; |
| rbd_dev->tag_set.numa_node = NUMA_NO_NODE; |
| rbd_dev->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; |
| rbd_dev->tag_set.nr_hw_queues = 1; |
| rbd_dev->tag_set.cmd_size = sizeof(struct work_struct); |
| |
| err = blk_mq_alloc_tag_set(&rbd_dev->tag_set); |
| if (err) |
| goto out_disk; |
| |
| q = blk_mq_init_queue(&rbd_dev->tag_set); |
| if (IS_ERR(q)) { |
| err = PTR_ERR(q); |
| goto out_tag_set; |
| } |
| |
| queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); |
| /* QUEUE_FLAG_ADD_RANDOM is off by default for blk-mq */ |
| |
| /* set io sizes to object size */ |
| segment_size = rbd_obj_bytes(&rbd_dev->header); |
| blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); |
| q->limits.max_sectors = queue_max_hw_sectors(q); |
| blk_queue_max_segments(q, segment_size / SECTOR_SIZE); |
| blk_queue_max_segment_size(q, segment_size); |
| blk_queue_io_min(q, segment_size); |
| blk_queue_io_opt(q, segment_size); |
| |
| /* enable the discard support */ |
| queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q); |
| q->limits.discard_granularity = segment_size; |
| q->limits.discard_alignment = segment_size; |
| blk_queue_max_discard_sectors(q, segment_size / SECTOR_SIZE); |
| blk_queue_max_write_zeroes_sectors(q, segment_size / SECTOR_SIZE); |
| |
| if (!ceph_test_opt(rbd_dev->rbd_client->client, NOCRC)) |
| q->backing_dev_info->capabilities |= BDI_CAP_STABLE_WRITES; |
| |
| /* |
| * disk_release() expects a queue ref from add_disk() and will |
| * put it. Hold an extra ref until add_disk() is called. |
| */ |
| WARN_ON(!blk_get_queue(q)); |
| disk->queue = q; |
| q->queuedata = rbd_dev; |
| |
| rbd_dev->disk = disk; |
| |
| return 0; |
| out_tag_set: |
| blk_mq_free_tag_set(&rbd_dev->tag_set); |
| out_disk: |
| put_disk(disk); |
| return err; |
| } |
| |
| /* |
| sysfs |
| */ |
| |
| static struct rbd_device *dev_to_rbd_dev(struct device *dev) |
| { |
| return container_of(dev, struct rbd_device, dev); |
| } |
| |
| static ssize_t rbd_size_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%llu\n", |
| (unsigned long long)rbd_dev->mapping.size); |
| } |
| |
| /* |
| * Note this shows the features for whatever's mapped, which is not |
| * necessarily the base image. |
| */ |
| static ssize_t rbd_features_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "0x%016llx\n", |
| (unsigned long long)rbd_dev->mapping.features); |
| } |
| |
| static ssize_t rbd_major_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| if (rbd_dev->major) |
| return sprintf(buf, "%d\n", rbd_dev->major); |
| |
| return sprintf(buf, "(none)\n"); |
| } |
| |
| static ssize_t rbd_minor_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%d\n", rbd_dev->minor); |
| } |
| |
| static ssize_t rbd_client_addr_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| struct ceph_entity_addr *client_addr = |
| ceph_client_addr(rbd_dev->rbd_client->client); |
| |
| return sprintf(buf, "%pISpc/%u\n", &client_addr->in_addr, |
| le32_to_cpu(client_addr->nonce)); |
| } |
| |
| static ssize_t rbd_client_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "client%lld\n", |
| ceph_client_gid(rbd_dev->rbd_client->client)); |
| } |
| |
| static ssize_t rbd_cluster_fsid_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%pU\n", &rbd_dev->rbd_client->client->fsid); |
| } |
| |
| static ssize_t rbd_config_info_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%s\n", rbd_dev->config_info); |
| } |
| |
| static ssize_t rbd_pool_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); |
| } |
| |
| static ssize_t rbd_pool_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%llu\n", |
| (unsigned long long) rbd_dev->spec->pool_id); |
| } |
| |
| static ssize_t rbd_name_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| if (rbd_dev->spec->image_name) |
| return sprintf(buf, "%s\n", rbd_dev->spec->image_name); |
| |
| return sprintf(buf, "(unknown)\n"); |
| } |
| |
| static ssize_t rbd_image_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%s\n", rbd_dev->spec->image_id); |
| } |
| |
| /* |
| * Shows the name of the currently-mapped snapshot (or |
| * RBD_SNAP_HEAD_NAME for the base image). |
| */ |
| static ssize_t rbd_snap_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); |
| } |
| |
| static ssize_t rbd_snap_id_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| return sprintf(buf, "%llu\n", rbd_dev->spec->snap_id); |
| } |
| |
| /* |
| * For a v2 image, shows the chain of parent images, separated by empty |
| * lines. For v1 images or if there is no parent, shows "(no parent |
| * image)". |
| */ |
| static ssize_t rbd_parent_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| ssize_t count = 0; |
| |
| if (!rbd_dev->parent) |
| return sprintf(buf, "(no parent image)\n"); |
| |
| for ( ; rbd_dev->parent; rbd_dev = rbd_dev->parent) { |
| struct rbd_spec *spec = rbd_dev->parent_spec; |
| |
| count += sprintf(&buf[count], "%s" |
| "pool_id %llu\npool_name %s\n" |
| "image_id %s\nimage_name %s\n" |
| "snap_id %llu\nsnap_name %s\n" |
| "overlap %llu\n", |
| !count ? "" : "\n", /* first? */ |
| spec->pool_id, spec->pool_name, |
| spec->image_id, spec->image_name ?: "(unknown)", |
| spec->snap_id, spec->snap_name, |
| rbd_dev->parent_overlap); |
| } |
| |
| return count; |
| } |
| |
| static ssize_t rbd_image_refresh(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t size) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| int ret; |
| |
| ret = rbd_dev_refresh(rbd_dev); |
| if (ret) |
| return ret; |
| |
| return size; |
| } |
| |
| static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); |
| static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); |
| static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); |
| static DEVICE_ATTR(minor, S_IRUGO, rbd_minor_show, NULL); |
| static DEVICE_ATTR(client_addr, S_IRUGO, rbd_client_addr_show, NULL); |
| static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); |
| static DEVICE_ATTR(cluster_fsid, S_IRUGO, rbd_cluster_fsid_show, NULL); |
| static DEVICE_ATTR(config_info, S_IRUSR, rbd_config_info_show, NULL); |
| static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); |
| static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); |
| static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); |
| static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); |
| static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); |
| static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); |
| static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
| static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); |
| |
| static struct attribute *rbd_attrs[] = { |
| &dev_attr_size.attr, |
| &dev_attr_features.attr, |
| &dev_attr_major.attr, |
| &dev_attr_minor.attr, |
| &dev_attr_client_addr.attr, |
| &dev_attr_client_id.attr, |
| &dev_attr_cluster_fsid.attr, |
| &dev_attr_config_info.attr, |
| &dev_attr_pool.attr, |
| &dev_attr_pool_id.attr, |
| &dev_attr_name.attr, |
| &dev_attr_image_id.attr, |
| &dev_attr_current_snap.attr, |
| &dev_attr_snap_id.attr, |
| &dev_attr_parent.attr, |
| &dev_attr_refresh.attr, |
| NULL |
| }; |
| |
| static struct attribute_group rbd_attr_group = { |
| .attrs = rbd_attrs, |
| }; |
| |
| static const struct attribute_group *rbd_attr_groups[] = { |
| &rbd_attr_group, |
| NULL |
| }; |
| |
| static void rbd_dev_release(struct device *dev); |
| |
| static const struct device_type rbd_device_type = { |
| .name = "rbd", |
| .groups = rbd_attr_groups, |
| .release = rbd_dev_release, |
| }; |
| |
| static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) |
| { |
| kref_get(&spec->kref); |
| |
| return spec; |
| } |
| |
| static void rbd_spec_free(struct kref *kref); |
| static void rbd_spec_put(struct rbd_spec *spec) |
| { |
| if (spec) |
| kref_put(&spec->kref, rbd_spec_free); |
| } |
| |
| static struct rbd_spec *rbd_spec_alloc(void) |
| { |
| struct rbd_spec *spec; |
| |
| spec = kzalloc(sizeof (*spec), GFP_KERNEL); |
| if (!spec) |
| return NULL; |
| |
| spec->pool_id = CEPH_NOPOOL; |
| spec->snap_id = CEPH_NOSNAP; |
| kref_init(&spec->kref); |
| |
| return spec; |
| } |
| |
| static void rbd_spec_free(struct kref *kref) |
| { |
| struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); |
| |
| kfree(spec->pool_name); |
| kfree(spec->image_id); |
| kfree(spec->image_name); |
| kfree(spec->snap_name); |
| kfree(spec); |
| } |
| |
| static void rbd_dev_free(struct rbd_device *rbd_dev) |
| { |
| WARN_ON(rbd_dev->watch_state != RBD_WATCH_STATE_UNREGISTERED); |
| WARN_ON(rbd_dev->lock_state != RBD_LOCK_STATE_UNLOCKED); |
| |
| ceph_oid_destroy(&rbd_dev->header_oid); |
| ceph_oloc_destroy(&rbd_dev->header_oloc); |
| kfree(rbd_dev->config_info); |
| |
| rbd_put_client(rbd_dev->rbd_client); |
| rbd_spec_put(rbd_dev->spec); |
| kfree(rbd_dev->opts); |
| kfree(rbd_dev); |
| } |
| |
| static void rbd_dev_release(struct device *dev) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| bool need_put = !!rbd_dev->opts; |
| |
| if (need_put) { |
| destroy_workqueue(rbd_dev->task_wq); |
| ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
| } |
| |
| rbd_dev_free(rbd_dev); |
| |
| /* |
| * This is racy, but way better than putting module outside of |
| * the release callback. The race window is pretty small, so |
| * doing something similar to dm (dm-builtin.c) is overkill. |
| */ |
| if (need_put) |
| module_put(THIS_MODULE); |
| } |
| |
| static struct rbd_device *__rbd_dev_create(struct rbd_client *rbdc, |
| struct rbd_spec *spec) |
| { |
| struct rbd_device *rbd_dev; |
| |
| rbd_dev = kzalloc(sizeof(*rbd_dev), GFP_KERNEL); |
| if (!rbd_dev) |
| return NULL; |
| |
| spin_lock_init(&rbd_dev->lock); |
| INIT_LIST_HEAD(&rbd_dev->node); |
| init_rwsem(&rbd_dev->header_rwsem); |
| |
| rbd_dev->header.data_pool_id = CEPH_NOPOOL; |
| ceph_oid_init(&rbd_dev->header_oid); |
| rbd_dev->header_oloc.pool = spec->pool_id; |
| |
| mutex_init(&rbd_dev->watch_mutex); |
| rbd_dev->watch_state = RBD_WATCH_STATE_UNREGISTERED; |
| INIT_DELAYED_WORK(&rbd_dev->watch_dwork, rbd_reregister_watch); |
| |
| init_rwsem(&rbd_dev->lock_rwsem); |
| rbd_dev->lock_state = RBD_LOCK_STATE_UNLOCKED; |
| INIT_WORK(&rbd_dev->acquired_lock_work, rbd_notify_acquired_lock); |
| INIT_WORK(&rbd_dev->released_lock_work, rbd_notify_released_lock); |
| INIT_DELAYED_WORK(&rbd_dev->lock_dwork, rbd_acquire_lock); |
| INIT_WORK(&rbd_dev->unlock_work, rbd_release_lock_work); |
| init_waitqueue_head(&rbd_dev->lock_waitq); |
| |
| rbd_dev->dev.bus = &rbd_bus_type; |
| rbd_dev->dev.type = &rbd_device_type; |
| rbd_dev->dev.parent = &rbd_root_dev; |
| device_initialize(&rbd_dev->dev); |
| |
| rbd_dev->rbd_client = rbdc; |
| rbd_dev->spec = spec; |
| |
| return rbd_dev; |
| } |
| |
| /* |
| * Create a mapping rbd_dev. |
| */ |
| static struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, |
| struct rbd_spec *spec, |
| struct rbd_options *opts) |
| { |
| struct rbd_device *rbd_dev; |
| |
| rbd_dev = __rbd_dev_create(rbdc, spec); |
| if (!rbd_dev) |
| return NULL; |
| |
| rbd_dev->opts = opts; |
| |
| /* get an id and fill in device name */ |
| rbd_dev->dev_id = ida_simple_get(&rbd_dev_id_ida, 0, |
| minor_to_rbd_dev_id(1 << MINORBITS), |
| GFP_KERNEL); |
| if (rbd_dev->dev_id < 0) |
| goto fail_rbd_dev; |
| |
| sprintf(rbd_dev->name, RBD_DRV_NAME "%d", rbd_dev->dev_id); |
| rbd_dev->task_wq = alloc_ordered_workqueue("%s-tasks", WQ_MEM_RECLAIM, |
| rbd_dev->name); |
| if (!rbd_dev->task_wq) |
| goto fail_dev_id; |
| |
| /* we have a ref from do_rbd_add() */ |
| __module_get(THIS_MODULE); |
| |
| dout("%s rbd_dev %p dev_id %d\n", __func__, rbd_dev, rbd_dev->dev_id); |
| return rbd_dev; |
| |
| fail_dev_id: |
| ida_simple_remove(&rbd_dev_id_ida, rbd_dev->dev_id); |
| fail_rbd_dev: |
| rbd_dev_free(rbd_dev); |
| return NULL; |
| } |
| |
| static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
| { |
| if (rbd_dev) |
| put_device(&rbd_dev->dev); |
| } |
| |
| /* |
| * Get the size and object order for an image snapshot, or if |
| * snap_id is CEPH_NOSNAP, gets this information for the base |
| * image. |
| */ |
| static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, |
| u8 *order, u64 *snap_size) |
| { |
| __le64 snapid = cpu_to_le64(snap_id); |
| int ret; |
| struct { |
| u8 order; |
| __le64 size; |
| } __attribute__ ((packed)) size_buf = { 0 }; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_size", |
| &snapid, sizeof(snapid), |
| &size_buf, sizeof(size_buf)); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| return ret; |
| if (ret < sizeof (size_buf)) |
| return -ERANGE; |
| |
| if (order) { |
| *order = size_buf.order; |
| dout(" order %u", (unsigned int)*order); |
| } |
| *snap_size = le64_to_cpu(size_buf.size); |
| |
| dout(" snap_id 0x%016llx snap_size = %llu\n", |
| (unsigned long long)snap_id, |
| (unsigned long long)*snap_size); |
| |
| return 0; |
| } |
| |
| static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) |
| { |
| return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, |
| &rbd_dev->header.obj_order, |
| &rbd_dev->header.image_size); |
| } |
| |
| static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) |
| { |
| void *reply_buf; |
| int ret; |
| void *p; |
| |
| reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); |
| if (!reply_buf) |
| return -ENOMEM; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_object_prefix", |
| NULL, 0, reply_buf, RBD_OBJ_PREFIX_LEN_MAX); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| |
| p = reply_buf; |
| rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
| p + ret, NULL, GFP_NOIO); |
| ret = 0; |
| |
| if (IS_ERR(rbd_dev->header.object_prefix)) { |
| ret = PTR_ERR(rbd_dev->header.object_prefix); |
| rbd_dev->header.object_prefix = NULL; |
| } else { |
| dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); |
| } |
| out: |
| kfree(reply_buf); |
| |
| return ret; |
| } |
| |
| static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, |
| u64 *snap_features) |
| { |
| __le64 snapid = cpu_to_le64(snap_id); |
| struct { |
| __le64 features; |
| __le64 incompat; |
| } __attribute__ ((packed)) features_buf = { 0 }; |
| u64 unsup; |
| int ret; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_features", |
| &snapid, sizeof(snapid), |
| &features_buf, sizeof(features_buf)); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| return ret; |
| if (ret < sizeof (features_buf)) |
| return -ERANGE; |
| |
| unsup = le64_to_cpu(features_buf.incompat) & ~RBD_FEATURES_SUPPORTED; |
| if (unsup) { |
| rbd_warn(rbd_dev, "image uses unsupported features: 0x%llx", |
| unsup); |
| return -ENXIO; |
| } |
| |
| *snap_features = le64_to_cpu(features_buf.features); |
| |
| dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", |
| (unsigned long long)snap_id, |
| (unsigned long long)*snap_features, |
| (unsigned long long)le64_to_cpu(features_buf.incompat)); |
| |
| return 0; |
| } |
| |
| static int rbd_dev_v2_features(struct rbd_device *rbd_dev) |
| { |
| return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, |
| &rbd_dev->header.features); |
| } |
| |
| static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) |
| { |
| struct rbd_spec *parent_spec; |
| size_t size; |
| void *reply_buf = NULL; |
| __le64 snapid; |
| void *p; |
| void *end; |
| u64 pool_id; |
| char *image_id; |
| u64 snap_id; |
| u64 overlap; |
| int ret; |
| |
| parent_spec = rbd_spec_alloc(); |
| if (!parent_spec) |
| return -ENOMEM; |
| |
| size = sizeof (__le64) + /* pool_id */ |
| sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ |
| sizeof (__le64) + /* snap_id */ |
| sizeof (__le64); /* overlap */ |
| reply_buf = kmalloc(size, GFP_KERNEL); |
| if (!reply_buf) { |
| ret = -ENOMEM; |
| goto out_err; |
| } |
| |
| snapid = cpu_to_le64(rbd_dev->spec->snap_id); |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_parent", |
| &snapid, sizeof(snapid), reply_buf, size); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out_err; |
| |
| p = reply_buf; |
| end = reply_buf + ret; |
| ret = -ERANGE; |
| ceph_decode_64_safe(&p, end, pool_id, out_err); |
| if (pool_id == CEPH_NOPOOL) { |
| /* |
| * Either the parent never existed, or we have |
| * record of it but the image got flattened so it no |
| * longer has a parent. When the parent of a |
| * layered image disappears we immediately set the |
| * overlap to 0. The effect of this is that all new |
| * requests will be treated as if the image had no |
| * parent. |
| */ |
| if (rbd_dev->parent_overlap) { |
| rbd_dev->parent_overlap = 0; |
| rbd_dev_parent_put(rbd_dev); |
| pr_info("%s: clone image has been flattened\n", |
| rbd_dev->disk->disk_name); |
| } |
| |
| goto out; /* No parent? No problem. */ |
| } |
| |
| /* The ceph file layout needs to fit pool id in 32 bits */ |
| |
| ret = -EIO; |
| if (pool_id > (u64)U32_MAX) { |
| rbd_warn(NULL, "parent pool id too large (%llu > %u)", |
| (unsigned long long)pool_id, U32_MAX); |
| goto out_err; |
| } |
| |
| image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| if (IS_ERR(image_id)) { |
| ret = PTR_ERR(image_id); |
| goto out_err; |
| } |
| ceph_decode_64_safe(&p, end, snap_id, out_err); |
| ceph_decode_64_safe(&p, end, overlap, out_err); |
| |
| /* |
| * The parent won't change (except when the clone is |
| * flattened, already handled that). So we only need to |
| * record the parent spec we have not already done so. |
| */ |
| if (!rbd_dev->parent_spec) { |
| parent_spec->pool_id = pool_id; |
| parent_spec->image_id = image_id; |
| parent_spec->snap_id = snap_id; |
| rbd_dev->parent_spec = parent_spec; |
| parent_spec = NULL; /* rbd_dev now owns this */ |
| } else { |
| kfree(image_id); |
| } |
| |
| /* |
| * We always update the parent overlap. If it's zero we issue |
| * a warning, as we will proceed as if there was no parent. |
| */ |
| if (!overlap) { |
| if (parent_spec) { |
| /* refresh, careful to warn just once */ |
| if (rbd_dev->parent_overlap) |
| rbd_warn(rbd_dev, |
| "clone now standalone (overlap became 0)"); |
| } else { |
| /* initial probe */ |
| rbd_warn(rbd_dev, "clone is standalone (overlap 0)"); |
| } |
| } |
| rbd_dev->parent_overlap = overlap; |
| |
| out: |
| ret = 0; |
| out_err: |
| kfree(reply_buf); |
| rbd_spec_put(parent_spec); |
| |
| return ret; |
| } |
| |
| static int rbd_dev_v2_striping_info(struct rbd_device *rbd_dev) |
| { |
| struct { |
| __le64 stripe_unit; |
| __le64 stripe_count; |
| } __attribute__ ((packed)) striping_info_buf = { 0 }; |
| size_t size = sizeof (striping_info_buf); |
| void *p; |
| u64 obj_size; |
| u64 stripe_unit; |
| u64 stripe_count; |
| int ret; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_stripe_unit_count", |
| NULL, 0, &striping_info_buf, size); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| return ret; |
| if (ret < size) |
| return -ERANGE; |
| |
| /* |
| * We don't actually support the "fancy striping" feature |
| * (STRIPINGV2) yet, but if the striping sizes are the |
| * defaults the behavior is the same as before. So find |
| * out, and only fail if the image has non-default values. |
| */ |
| ret = -EINVAL; |
| obj_size = rbd_obj_bytes(&rbd_dev->header); |
| p = &striping_info_buf; |
| stripe_unit = ceph_decode_64(&p); |
| if (stripe_unit != obj_size) { |
| rbd_warn(rbd_dev, "unsupported stripe unit " |
| "(got %llu want %llu)", |
| stripe_unit, obj_size); |
| return -EINVAL; |
| } |
| stripe_count = ceph_decode_64(&p); |
| if (stripe_count != 1) { |
| rbd_warn(rbd_dev, "unsupported stripe count " |
| "(got %llu want 1)", stripe_count); |
| return -EINVAL; |
| } |
| rbd_dev->header.stripe_unit = stripe_unit; |
| rbd_dev->header.stripe_count = stripe_count; |
| |
| return 0; |
| } |
| |
| static int rbd_dev_v2_data_pool(struct rbd_device *rbd_dev) |
| { |
| __le64 data_pool_id; |
| int ret; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_data_pool", |
| NULL, 0, &data_pool_id, sizeof(data_pool_id)); |
| if (ret < 0) |
| return ret; |
| if (ret < sizeof(data_pool_id)) |
| return -EBADMSG; |
| |
| rbd_dev->header.data_pool_id = le64_to_cpu(data_pool_id); |
| WARN_ON(rbd_dev->header.data_pool_id == CEPH_NOPOOL); |
| return 0; |
| } |
| |
| static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
| { |
| CEPH_DEFINE_OID_ONSTACK(oid); |
| size_t image_id_size; |
| char *image_id; |
| void *p; |
| void *end; |
| size_t size; |
| void *reply_buf = NULL; |
| size_t len = 0; |
| char *image_name = NULL; |
| int ret; |
| |
| rbd_assert(!rbd_dev->spec->image_name); |
| |
| len = strlen(rbd_dev->spec->image_id); |
| image_id_size = sizeof (__le32) + len; |
| image_id = kmalloc(image_id_size, GFP_KERNEL); |
| if (!image_id) |
| return NULL; |
| |
| p = image_id; |
| end = image_id + image_id_size; |
| ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32)len); |
| |
| size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; |
| reply_buf = kmalloc(size, GFP_KERNEL); |
| if (!reply_buf) |
| goto out; |
| |
| ceph_oid_printf(&oid, "%s", RBD_DIRECTORY); |
| ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
| "dir_get_name", image_id, image_id_size, |
| reply_buf, size); |
| if (ret < 0) |
| goto out; |
| p = reply_buf; |
| end = reply_buf + ret; |
| |
| image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); |
| if (IS_ERR(image_name)) |
| image_name = NULL; |
| else |
| dout("%s: name is %s len is %zd\n", __func__, image_name, len); |
| out: |
| kfree(reply_buf); |
| kfree(image_id); |
| |
| return image_name; |
| } |
| |
| static u64 rbd_v1_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| { |
| struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| const char *snap_name; |
| u32 which = 0; |
| |
| /* Skip over names until we find the one we are looking for */ |
| |
| snap_name = rbd_dev->header.snap_names; |
| while (which < snapc->num_snaps) { |
| if (!strcmp(name, snap_name)) |
| return snapc->snaps[which]; |
| snap_name += strlen(snap_name) + 1; |
| which++; |
| } |
| return CEPH_NOSNAP; |
| } |
| |
| static u64 rbd_v2_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| { |
| struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| u32 which; |
| bool found = false; |
| u64 snap_id; |
| |
| for (which = 0; !found && which < snapc->num_snaps; which++) { |
| const char *snap_name; |
| |
| snap_id = snapc->snaps[which]; |
| snap_name = rbd_dev_v2_snap_name(rbd_dev, snap_id); |
| if (IS_ERR(snap_name)) { |
| /* ignore no-longer existing snapshots */ |
| if (PTR_ERR(snap_name) == -ENOENT) |
| continue; |
| else |
| break; |
| } |
| found = !strcmp(name, snap_name); |
| kfree(snap_name); |
| } |
| return found ? snap_id : CEPH_NOSNAP; |
| } |
| |
| /* |
| * Assumes name is never RBD_SNAP_HEAD_NAME; returns CEPH_NOSNAP if |
| * no snapshot by that name is found, or if an error occurs. |
| */ |
| static u64 rbd_snap_id_by_name(struct rbd_device *rbd_dev, const char *name) |
| { |
| if (rbd_dev->image_format == 1) |
| return rbd_v1_snap_id_by_name(rbd_dev, name); |
| |
| return rbd_v2_snap_id_by_name(rbd_dev, name); |
| } |
| |
| /* |
| * An image being mapped will have everything but the snap id. |
| */ |
| static int rbd_spec_fill_snap_id(struct rbd_device *rbd_dev) |
| { |
| struct rbd_spec *spec = rbd_dev->spec; |
| |
| rbd_assert(spec->pool_id != CEPH_NOPOOL && spec->pool_name); |
| rbd_assert(spec->image_id && spec->image_name); |
| rbd_assert(spec->snap_name); |
| |
| if (strcmp(spec->snap_name, RBD_SNAP_HEAD_NAME)) { |
| u64 snap_id; |
| |
| snap_id = rbd_snap_id_by_name(rbd_dev, spec->snap_name); |
| if (snap_id == CEPH_NOSNAP) |
| return -ENOENT; |
| |
| spec->snap_id = snap_id; |
| } else { |
| spec->snap_id = CEPH_NOSNAP; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * A parent image will have all ids but none of the names. |
| * |
| * All names in an rbd spec are dynamically allocated. It's OK if we |
| * can't figure out the name for an image id. |
| */ |
| static int rbd_spec_fill_names(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct rbd_spec *spec = rbd_dev->spec; |
| const char *pool_name; |
| const char *image_name; |
| const char *snap_name; |
| int ret; |
| |
| rbd_assert(spec->pool_id != CEPH_NOPOOL); |
| rbd_assert(spec->image_id); |
| rbd_assert(spec->snap_id != CEPH_NOSNAP); |
| |
| /* Get the pool name; we have to make our own copy of this */ |
| |
| pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, spec->pool_id); |
| if (!pool_name) { |
| rbd_warn(rbd_dev, "no pool with id %llu", spec->pool_id); |
| return -EIO; |
| } |
| pool_name = kstrdup(pool_name, GFP_KERNEL); |
| if (!pool_name) |
| return -ENOMEM; |
| |
| /* Fetch the image name; tolerate failure here */ |
| |
| image_name = rbd_dev_image_name(rbd_dev); |
| if (!image_name) |
| rbd_warn(rbd_dev, "unable to get image name"); |
| |
| /* Fetch the snapshot name */ |
| |
| snap_name = rbd_snap_name(rbd_dev, spec->snap_id); |
| if (IS_ERR(snap_name)) { |
| ret = PTR_ERR(snap_name); |
| goto out_err; |
| } |
| |
| spec->pool_name = pool_name; |
| spec->image_name = image_name; |
| spec->snap_name = snap_name; |
| |
| return 0; |
| |
| out_err: |
| kfree(image_name); |
| kfree(pool_name); |
| return ret; |
| } |
| |
| static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev) |
| { |
| size_t size; |
| int ret; |
| void *reply_buf; |
| void *p; |
| void *end; |
| u64 seq; |
| u32 snap_count; |
| struct ceph_snap_context *snapc; |
| u32 i; |
| |
| /* |
| * We'll need room for the seq value (maximum snapshot id), |
| * snapshot count, and array of that many snapshot ids. |
| * For now we have a fixed upper limit on the number we're |
| * prepared to receive. |
| */ |
| size = sizeof (__le64) + sizeof (__le32) + |
| RBD_MAX_SNAP_COUNT * sizeof (__le64); |
| reply_buf = kzalloc(size, GFP_KERNEL); |
| if (!reply_buf) |
| return -ENOMEM; |
| |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_snapcontext", |
| NULL, 0, reply_buf, size); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| |
| p = reply_buf; |
| end = reply_buf + ret; |
| ret = -ERANGE; |
| ceph_decode_64_safe(&p, end, seq, out); |
| ceph_decode_32_safe(&p, end, snap_count, out); |
| |
| /* |
| * Make sure the reported number of snapshot ids wouldn't go |
| * beyond the end of our buffer. But before checking that, |
| * make sure the computed size of the snapshot context we |
| * allocate is representable in a size_t. |
| */ |
| if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) |
| / sizeof (u64)) { |
| ret = -EINVAL; |
| goto out; |
| } |
| if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) |
| goto out; |
| ret = 0; |
| |
| snapc = ceph_create_snap_context(snap_count, GFP_KERNEL); |
| if (!snapc) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| snapc->seq = seq; |
| for (i = 0; i < snap_count; i++) |
| snapc->snaps[i] = ceph_decode_64(&p); |
| |
| ceph_put_snap_context(rbd_dev->header.snapc); |
| rbd_dev->header.snapc = snapc; |
| |
| dout(" snap context seq = %llu, snap_count = %u\n", |
| (unsigned long long)seq, (unsigned int)snap_count); |
| out: |
| kfree(reply_buf); |
| |
| return ret; |
| } |
| |
| static const char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, |
| u64 snap_id) |
| { |
| size_t size; |
| void *reply_buf; |
| __le64 snapid; |
| int ret; |
| void *p; |
| void *end; |
| char *snap_name; |
| |
| size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; |
| reply_buf = kmalloc(size, GFP_KERNEL); |
| if (!reply_buf) |
| return ERR_PTR(-ENOMEM); |
| |
| snapid = cpu_to_le64(snap_id); |
| ret = rbd_obj_method_sync(rbd_dev, &rbd_dev->header_oid, |
| &rbd_dev->header_oloc, "get_snapshot_name", |
| &snapid, sizeof(snapid), reply_buf, size); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) { |
| snap_name = ERR_PTR(ret); |
| goto out; |
| } |
| |
| p = reply_buf; |
| end = reply_buf + ret; |
| snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| if (IS_ERR(snap_name)) |
| goto out; |
| |
| dout(" snap_id 0x%016llx snap_name = %s\n", |
| (unsigned long long)snap_id, snap_name); |
| out: |
| kfree(reply_buf); |
| |
| return snap_name; |
| } |
| |
| static int rbd_dev_v2_header_info(struct rbd_device *rbd_dev) |
| { |
| bool first_time = rbd_dev->header.object_prefix == NULL; |
| int ret; |
| |
| ret = rbd_dev_v2_image_size(rbd_dev); |
| if (ret) |
| return ret; |
| |
| if (first_time) { |
| ret = rbd_dev_v2_header_onetime(rbd_dev); |
| if (ret) |
| return ret; |
| } |
| |
| ret = rbd_dev_v2_snap_context(rbd_dev); |
| if (ret && first_time) { |
| kfree(rbd_dev->header.object_prefix); |
| rbd_dev->header.object_prefix = NULL; |
| } |
| |
| return ret; |
| } |
| |
| static int rbd_dev_header_info(struct rbd_device *rbd_dev) |
| { |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| |
| if (rbd_dev->image_format == 1) |
| return rbd_dev_v1_header_info(rbd_dev); |
| |
| return rbd_dev_v2_header_info(rbd_dev); |
| } |
| |
| /* |
| * Skips over white space at *buf, and updates *buf to point to the |
| * first found non-space character (if any). Returns the length of |
| * the token (string of non-white space characters) found. Note |
| * that *buf must be terminated with '\0'. |
| */ |
| static inline size_t next_token(const char **buf) |
| { |
| /* |
| * These are the characters that produce nonzero for |
| * isspace() in the "C" and "POSIX" locales. |
| */ |
| const char *spaces = " \f\n\r\t\v"; |
| |
| *buf += strspn(*buf, spaces); /* Find start of token */ |
| |
| return strcspn(*buf, spaces); /* Return token length */ |
| } |
| |
| /* |
| * Finds the next token in *buf, dynamically allocates a buffer big |
| * enough to hold a copy of it, and copies the token into the new |
| * buffer. The copy is guaranteed to be terminated with '\0'. Note |
| * that a duplicate buffer is created even for a zero-length token. |
| * |
| * Returns a pointer to the newly-allocated duplicate, or a null |
| * pointer if memory for the duplicate was not available. If |
| * the lenp argument is a non-null pointer, the length of the token |
| * (not including the '\0') is returned in *lenp. |
| * |
| * If successful, the *buf pointer will be updated to point beyond |
| * the end of the found token. |
| * |
| * Note: uses GFP_KERNEL for allocation. |
| */ |
| static inline char *dup_token(const char **buf, size_t *lenp) |
| { |
| char *dup; |
| size_t len; |
| |
| len = next_token(buf); |
| dup = kmemdup(*buf, len + 1, GFP_KERNEL); |
| if (!dup) |
| return NULL; |
| *(dup + len) = '\0'; |
| *buf += len; |
| |
| if (lenp) |
| *lenp = len; |
| |
| return dup; |
| } |
| |
| /* |
| * Parse the options provided for an "rbd add" (i.e., rbd image |
| * mapping) request. These arrive via a write to /sys/bus/rbd/add, |
| * and the data written is passed here via a NUL-terminated buffer. |
| * Returns 0 if successful or an error code otherwise. |
| * |
| * The information extracted from these options is recorded in |
| * the other parameters which return dynamically-allocated |
| * structures: |
| * ceph_opts |
| * The address of a pointer that will refer to a ceph options |
| * structure. Caller must release the returned pointer using |
| * ceph_destroy_options() when it is no longer needed. |
| * rbd_opts |
| * Address of an rbd options pointer. Fully initialized by |
| * this function; caller must release with kfree(). |
| * spec |
| * Address of an rbd image specification pointer. Fully |
| * initialized by this function based on parsed options. |
| * Caller must release with rbd_spec_put(). |
| * |
| * The options passed take this form: |
| * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] |
| * where: |
| * <mon_addrs> |
| * A comma-separated list of one or more monitor addresses. |
| * A monitor address is an ip address, optionally followed |
| * by a port number (separated by a colon). |
| * I.e.: ip1[:port1][,ip2[:port2]...] |
| * <options> |
| * A comma-separated list of ceph and/or rbd options. |
| * <pool_name> |
| * The name of the rados pool containing the rbd image. |
| * <image_name> |
| * The name of the image in that pool to map. |
| * <snap_id> |
| * An optional snapshot id. If provided, the mapping will |
| * present data from the image at the time that snapshot was |
| * created. The image head is used if no snapshot id is |
| * provided. Snapshot mappings are always read-only. |
| */ |
| static int rbd_add_parse_args(const char *buf, |
| struct ceph_options **ceph_opts, |
| struct rbd_options **opts, |
| struct rbd_spec **rbd_spec) |
| { |
| size_t len; |
| char *options; |
| const char *mon_addrs; |
| char *snap_name; |
| size_t mon_addrs_size; |
| struct rbd_spec *spec = NULL; |
| struct rbd_options *rbd_opts = NULL; |
| struct ceph_options *copts; |
| int ret; |
| |
| /* The first four tokens are required */ |
| |
| len = next_token(&buf); |
| if (!len) { |
| rbd_warn(NULL, "no monitor address(es) provided"); |
| return -EINVAL; |
| } |
| mon_addrs = buf; |
| mon_addrs_size = len + 1; |
| buf += len; |
| |
| ret = -EINVAL; |
| options = dup_token(&buf, NULL); |
| if (!options) |
| return -ENOMEM; |
| if (!*options) { |
| rbd_warn(NULL, "no options provided"); |
| goto out_err; |
| } |
| |
| spec = rbd_spec_alloc(); |
| if (!spec) |
| goto out_mem; |
| |
| spec->pool_name = dup_token(&buf, NULL); |
| if (!spec->pool_name) |
| goto out_mem; |
| if (!*spec->pool_name) { |
| rbd_warn(NULL, "no pool name provided"); |
| goto out_err; |
| } |
| |
| spec->image_name = dup_token(&buf, NULL); |
| if (!spec->image_name) |
| goto out_mem; |
| if (!*spec->image_name) { |
| rbd_warn(NULL, "no image name provided"); |
| goto out_err; |
| } |
| |
| /* |
| * Snapshot name is optional; default is to use "-" |
| * (indicating the head/no snapshot). |
| */ |
| len = next_token(&buf); |
| if (!len) { |
| buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ |
| len = sizeof (RBD_SNAP_HEAD_NAME) - 1; |
| } else if (len > RBD_MAX_SNAP_NAME_LEN) { |
| ret = -ENAMETOOLONG; |
| goto out_err; |
| } |
| snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
| if (!snap_name) |
| goto out_mem; |
| *(snap_name + len) = '\0'; |
| spec->snap_name = snap_name; |
| |
| /* Initialize all rbd options to the defaults */ |
| |
| rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); |
| if (!rbd_opts) |
| goto out_mem; |
| |
| rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; |
| rbd_opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT; |
| rbd_opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT; |
| rbd_opts->exclusive = RBD_EXCLUSIVE_DEFAULT; |
| |
| copts = ceph_parse_options(options, mon_addrs, |
| mon_addrs + mon_addrs_size - 1, |
| parse_rbd_opts_token, rbd_opts); |
| if (IS_ERR(copts)) { |
| ret = PTR_ERR(copts); |
| goto out_err; |
| } |
| kfree(options); |
| |
| *ceph_opts = copts; |
| *opts = rbd_opts; |
| *rbd_spec = spec; |
| |
| return 0; |
| out_mem: |
| ret = -ENOMEM; |
| out_err: |
| kfree(rbd_opts); |
| rbd_spec_put(spec); |
| kfree(options); |
| |
| return ret; |
| } |
| |
| /* |
| * Return pool id (>= 0) or a negative error code. |
| */ |
| static int rbd_add_get_pool_id(struct rbd_client *rbdc, const char *pool_name) |
| { |
| struct ceph_options *opts = rbdc->client->options; |
| u64 newest_epoch; |
| int tries = 0; |
| int ret; |
| |
| again: |
| ret = ceph_pg_poolid_by_name(rbdc->client->osdc.osdmap, pool_name); |
| if (ret == -ENOENT && tries++ < 1) { |
| ret = ceph_monc_get_version(&rbdc->client->monc, "osdmap", |
| &newest_epoch); |
| if (ret < 0) |
| return ret; |
| |
| if (rbdc->client->osdc.osdmap->epoch < newest_epoch) { |
| ceph_osdc_maybe_request_map(&rbdc->client->osdc); |
| (void) ceph_monc_wait_osdmap(&rbdc->client->monc, |
| newest_epoch, |
| opts->mount_timeout); |
| goto again; |
| } else { |
| /* the osdmap we have is new enough */ |
| return -ENOENT; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static void rbd_dev_image_unlock(struct rbd_device *rbd_dev) |
| { |
| down_write(&rbd_dev->lock_rwsem); |
| if (__rbd_is_lock_owner(rbd_dev)) |
| rbd_unlock(rbd_dev); |
| up_write(&rbd_dev->lock_rwsem); |
| } |
| |
| static int rbd_add_acquire_lock(struct rbd_device *rbd_dev) |
| { |
| if (!(rbd_dev->header.features & RBD_FEATURE_EXCLUSIVE_LOCK)) { |
| rbd_warn(rbd_dev, "exclusive-lock feature is not enabled"); |
| return -EINVAL; |
| } |
| |
| /* FIXME: "rbd map --exclusive" should be in interruptible */ |
| down_read(&rbd_dev->lock_rwsem); |
| rbd_wait_state_locked(rbd_dev); |
| up_read(&rbd_dev->lock_rwsem); |
| if (test_bit(RBD_DEV_FLAG_BLACKLISTED, &rbd_dev->flags)) { |
| rbd_warn(rbd_dev, "failed to acquire exclusive lock"); |
| return -EROFS; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * An rbd format 2 image has a unique identifier, distinct from the |
| * name given to it by the user. Internally, that identifier is |
| * what's used to specify the names of objects related to the image. |
| * |
| * A special "rbd id" object is used to map an rbd image name to its |
| * id. If that object doesn't exist, then there is no v2 rbd image |
| * with the supplied name. |
| * |
| * This function will record the given rbd_dev's image_id field if |
| * it can be determined, and in that case will return 0. If any |
| * errors occur a negative errno will be returned and the rbd_dev's |
| * image_id field will be unchanged (and should be NULL). |
| */ |
| static int rbd_dev_image_id(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| size_t size; |
| CEPH_DEFINE_OID_ONSTACK(oid); |
| void *response; |
| char *image_id; |
| |
| /* |
| * When probing a parent image, the image id is already |
| * known (and the image name likely is not). There's no |
| * need to fetch the image id again in this case. We |
| * do still need to set the image format though. |
| */ |
| if (rbd_dev->spec->image_id) { |
| rbd_dev->image_format = *rbd_dev->spec->image_id ? 2 : 1; |
| |
| return 0; |
| } |
| |
| /* |
| * First, see if the format 2 image id file exists, and if |
| * so, get the image's persistent id from it. |
| */ |
| ret = ceph_oid_aprintf(&oid, GFP_KERNEL, "%s%s", RBD_ID_PREFIX, |
| rbd_dev->spec->image_name); |
| if (ret) |
| return ret; |
| |
| dout("rbd id object name is %s\n", oid.name); |
| |
| /* Response will be an encoded string, which includes a length */ |
| |
| size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; |
| response = kzalloc(size, GFP_NOIO); |
| if (!response) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| /* If it doesn't exist we'll assume it's a format 1 image */ |
| |
| ret = rbd_obj_method_sync(rbd_dev, &oid, &rbd_dev->header_oloc, |
| "get_id", NULL, 0, |
| response, RBD_IMAGE_ID_LEN_MAX); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret == -ENOENT) { |
| image_id = kstrdup("", GFP_KERNEL); |
| ret = image_id ? 0 : -ENOMEM; |
| if (!ret) |
| rbd_dev->image_format = 1; |
| } else if (ret >= 0) { |
| void *p = response; |
| |
| image_id = ceph_extract_encoded_string(&p, p + ret, |
| NULL, GFP_NOIO); |
| ret = PTR_ERR_OR_ZERO(image_id); |
| if (!ret) |
| rbd_dev->image_format = 2; |
| } |
| |
| if (!ret) { |
| rbd_dev->spec->image_id = image_id; |
| dout("image_id is %s\n", image_id); |
| } |
| out: |
| kfree(response); |
| ceph_oid_destroy(&oid); |
| return ret; |
| } |
| |
| /* |
| * Undo whatever state changes are made by v1 or v2 header info |
| * call. |
| */ |
| static void rbd_dev_unprobe(struct rbd_device *rbd_dev) |
| { |
| struct rbd_image_header *header; |
| |
| rbd_dev_parent_put(rbd_dev); |
| |
| /* Free dynamic fields from the header, then zero it out */ |
| |
| header = &rbd_dev->header; |
| ceph_put_snap_context(header->snapc); |
| kfree(header->snap_sizes); |
| kfree(header->snap_names); |
| kfree(header->object_prefix); |
| memset(header, 0, sizeof (*header)); |
| } |
| |
| static int rbd_dev_v2_header_onetime(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| ret = rbd_dev_v2_object_prefix(rbd_dev); |
| if (ret) |
| goto out_err; |
| |
| /* |
| * Get the and check features for the image. Currently the |
| * features are assumed to never change. |
| */ |
| ret = rbd_dev_v2_features(rbd_dev); |
| if (ret) |
| goto out_err; |
| |
| /* If the image supports fancy striping, get its parameters */ |
| |
| if (rbd_dev->header.features & RBD_FEATURE_STRIPINGV2) { |
| ret = rbd_dev_v2_striping_info(rbd_dev); |
| if (ret < 0) |
| goto out_err; |
| } |
| |
| if (rbd_dev->header.features & RBD_FEATURE_DATA_POOL) { |
| ret = rbd_dev_v2_data_pool(rbd_dev); |
| if (ret) |
| goto out_err; |
| } |
| |
| rbd_init_layout(rbd_dev); |
| return 0; |
| |
| out_err: |
| rbd_dev->header.features = 0; |
| kfree(rbd_dev->header.object_prefix); |
| rbd_dev->header.object_prefix = NULL; |
| return ret; |
| } |
| |
| /* |
| * @depth is rbd_dev_image_probe() -> rbd_dev_probe_parent() -> |
| * rbd_dev_image_probe() recursion depth, which means it's also the |
| * length of the already discovered part of the parent chain. |
| */ |
| static int rbd_dev_probe_parent(struct rbd_device *rbd_dev, int depth) |
| { |
| struct rbd_device *parent = NULL; |
| int ret; |
| |
| if (!rbd_dev->parent_spec) |
| return 0; |
| |
| if (++depth > RBD_MAX_PARENT_CHAIN_LEN) { |
| pr_info("parent chain is too long (%d)\n", depth); |
| ret = -EINVAL; |
| goto out_err; |
| } |
| |
| parent = __rbd_dev_create(rbd_dev->rbd_client, rbd_dev->parent_spec); |
| if (!parent) { |
| ret = -ENOMEM; |
| goto out_err; |
| } |
| |
| /* |
| * Images related by parent/child relationships always share |
| * rbd_client and spec/parent_spec, so bump their refcounts. |
| */ |
| __rbd_get_client(rbd_dev->rbd_client); |
| rbd_spec_get(rbd_dev->parent_spec); |
| |
| ret = rbd_dev_image_probe(parent, depth); |
| if (ret < 0) |
| goto out_err; |
| |
| rbd_dev->parent = parent; |
| atomic_set(&rbd_dev->parent_ref, 1); |
| return 0; |
| |
| out_err: |
| rbd_dev_unparent(rbd_dev); |
| rbd_dev_destroy(parent); |
| return ret; |
| } |
| |
| static void rbd_dev_device_release(struct rbd_device *rbd_dev) |
| { |
| clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| rbd_dev_mapping_clear(rbd_dev); |
| rbd_free_disk(rbd_dev); |
| if (!single_major) |
| unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| } |
| |
| /* |
| * rbd_dev->header_rwsem must be locked for write and will be unlocked |
| * upon return. |
| */ |
| static int rbd_dev_device_setup(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| /* Record our major and minor device numbers. */ |
| |
| if (!single_major) { |
| ret = register_blkdev(0, rbd_dev->name); |
| if (ret < 0) |
| goto err_out_unlock; |
| |
| rbd_dev->major = ret; |
| rbd_dev->minor = 0; |
| } else { |
| rbd_dev->major = rbd_major; |
| rbd_dev->minor = rbd_dev_id_to_minor(rbd_dev->dev_id); |
| } |
| |
| /* Set up the blkdev mapping. */ |
| |
| ret = rbd_init_disk(rbd_dev); |
| if (ret) |
| goto err_out_blkdev; |
| |
| ret = rbd_dev_mapping_set(rbd_dev); |
| if (ret) |
| goto err_out_disk; |
| |
| set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
| set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only); |
| |
| ret = dev_set_name(&rbd_dev->dev, "%d", rbd_dev->dev_id); |
| if (ret) |
| goto err_out_mapping; |
| |
| set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| up_write(&rbd_dev->header_rwsem); |
| return 0; |
| |
| err_out_mapping: |
| rbd_dev_mapping_clear(rbd_dev); |
| err_out_disk: |
| rbd_free_disk(rbd_dev); |
| err_out_blkdev: |
| if (!single_major) |
| unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| err_out_unlock: |
| up_write(&rbd_dev->header_rwsem); |
| return ret; |
| } |
| |
| static int rbd_dev_header_name(struct rbd_device *rbd_dev) |
| { |
| struct rbd_spec *spec = rbd_dev->spec; |
| int ret; |
| |
| /* Record the header object name for this rbd image. */ |
| |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| if (rbd_dev->image_format == 1) |
| ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
| spec->image_name, RBD_SUFFIX); |
| else |
| ret = ceph_oid_aprintf(&rbd_dev->header_oid, GFP_KERNEL, "%s%s", |
| RBD_HEADER_PREFIX, spec->image_id); |
| |
| return ret; |
| } |
| |
| static void rbd_dev_image_release(struct rbd_device *rbd_dev) |
| { |
| rbd_dev_unprobe(rbd_dev); |
| if (rbd_dev->opts) |
| rbd_unregister_watch(rbd_dev); |
| rbd_dev->image_format = 0; |
| kfree(rbd_dev->spec->image_id); |
| rbd_dev->spec->image_id = NULL; |
| } |
| |
| /* |
| * Probe for the existence of the header object for the given rbd |
| * device. If this image is the one being mapped (i.e., not a |
| * parent), initiate a watch on its header object before using that |
| * object to get detailed information about the rbd image. |
| */ |
| static int rbd_dev_image_probe(struct rbd_device *rbd_dev, int depth) |
| { |
| int ret; |
| |
| /* |
| * Get the id from the image id object. Unless there's an |
| * error, rbd_dev->spec->image_id will be filled in with |
| * a dynamically-allocated string, and rbd_dev->image_format |
| * will be set to either 1 or 2. |
| */ |
| ret = rbd_dev_image_id(rbd_dev); |
| if (ret) |
| return ret; |
| |
| ret = rbd_dev_header_name(rbd_dev); |
| if (ret) |
| goto err_out_format; |
| |
| if (!depth) { |
| ret = rbd_register_watch(rbd_dev); |
| if (ret) { |
| if (ret == -ENOENT) |
| pr_info("image %s/%s does not exist\n", |
| rbd_dev->spec->pool_name, |
| rbd_dev->spec->image_name); |
| goto err_out_format; |
| } |
| } |
| |
| ret = rbd_dev_header_info(rbd_dev); |
| if (ret) |
| goto err_out_watch; |
| |
| /* |
| * If this image is the one being mapped, we have pool name and |
| * id, image name and id, and snap name - need to fill snap id. |
| * Otherwise this is a parent image, identified by pool, image |
| * and snap ids - need to fill in names for those ids. |
| */ |
| if (!depth) |
| ret = rbd_spec_fill_snap_id(rbd_dev); |
| else |
| ret = rbd_spec_fill_names(rbd_dev); |
| if (ret) { |
| if (ret == -ENOENT) |
| pr_info("snap %s/%s@%s does not exist\n", |
| rbd_dev->spec->pool_name, |
| rbd_dev->spec->image_name, |
| rbd_dev->spec->snap_name); |
| goto err_out_probe; |
| } |
| |
| if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
| ret = rbd_dev_v2_parent_info(rbd_dev); |
| if (ret) |
| goto err_out_probe; |
| |
| /* |
| * Need to warn users if this image is the one being |
| * mapped and has a parent. |
| */ |
| if (!depth && rbd_dev->parent_spec) |
| rbd_warn(rbd_dev, |
| "WARNING: kernel layering is EXPERIMENTAL!"); |
| } |
| |
| ret = rbd_dev_probe_parent(rbd_dev, depth); |
| if (ret) |
| goto err_out_probe; |
| |
| dout("discovered format %u image, header name is %s\n", |
| rbd_dev->image_format, rbd_dev->header_oid.name); |
| return 0; |
| |
| err_out_probe: |
| rbd_dev_unprobe(rbd_dev); |
| err_out_watch: |
| if (!depth) |
| rbd_unregister_watch(rbd_dev); |
| err_out_format: |
| rbd_dev->image_format = 0; |
| kfree(rbd_dev->spec->image_id); |
| rbd_dev->spec->image_id = NULL; |
| return ret; |
| } |
| |
| static ssize_t do_rbd_add(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| struct rbd_device *rbd_dev = NULL; |
| struct ceph_options *ceph_opts = NULL; |
| struct rbd_options *rbd_opts = NULL; |
| struct rbd_spec *spec = NULL; |
| struct rbd_client *rbdc; |
| bool read_only; |
| int rc; |
| |
| if (!try_module_get(THIS_MODULE)) |
| return -ENODEV; |
| |
| /* parse add command */ |
| rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); |
| if (rc < 0) |
| goto out; |
| |
| rbdc = rbd_get_client(ceph_opts); |
| if (IS_ERR(rbdc)) { |
| rc = PTR_ERR(rbdc); |
| goto err_out_args; |
| } |
| |
| /* pick the pool */ |
| rc = rbd_add_get_pool_id(rbdc, spec->pool_name); |
| if (rc < 0) { |
| if (rc == -ENOENT) |
| pr_info("pool %s does not exist\n", spec->pool_name); |
| goto err_out_client; |
| } |
| spec->pool_id = (u64)rc; |
| |
| rbd_dev = rbd_dev_create(rbdc, spec, rbd_opts); |
| if (!rbd_dev) { |
| rc = -ENOMEM; |
| goto err_out_client; |
| } |
| rbdc = NULL; /* rbd_dev now owns this */ |
| spec = NULL; /* rbd_dev now owns this */ |
| rbd_opts = NULL; /* rbd_dev now owns this */ |
| |
| rbd_dev->config_info = kstrdup(buf, GFP_KERNEL); |
| if (!rbd_dev->config_info) { |
| rc = -ENOMEM; |
| goto err_out_rbd_dev; |
| } |
| |
| down_write(&rbd_dev->header_rwsem); |
| rc = rbd_dev_image_probe(rbd_dev, 0); |
| if (rc < 0) { |
| up_write(&rbd_dev->header_rwsem); |
| goto err_out_rbd_dev; |
| } |
| |
| /* If we are mapping a snapshot it must be marked read-only */ |
| |
| read_only = rbd_dev->opts->read_only; |
| if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| read_only = true; |
| rbd_dev->mapping.read_only = read_only; |
| |
| rc = rbd_dev_device_setup(rbd_dev); |
| if (rc) |
| goto err_out_image_probe; |
| |
| if (rbd_dev->opts->exclusive) { |
| rc = rbd_add_acquire_lock(rbd_dev); |
| if (rc) |
| goto err_out_device_setup; |
| } |
| |
| /* Everything's ready. Announce the disk to the world. */ |
| |
| rc = device_add(&rbd_dev->dev); |
| if (rc) |
| goto err_out_image_lock; |
| |
| add_disk(rbd_dev->disk); |
| /* see rbd_init_disk() */ |
| blk_put_queue(rbd_dev->disk->queue); |
| |
| spin_lock(&rbd_dev_list_lock); |
| list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| spin_unlock(&rbd_dev_list_lock); |
| |
| pr_info("%s: capacity %llu features 0x%llx\n", rbd_dev->disk->disk_name, |
| (unsigned long long)get_capacity(rbd_dev->disk) << SECTOR_SHIFT, |
| rbd_dev->header.features); |
| rc = count; |
| out: |
| module_put(THIS_MODULE); |
| return rc; |
| |
| err_out_image_lock: |
| rbd_dev_image_unlock(rbd_dev); |
| err_out_device_setup: |
| rbd_dev_device_release(rbd_dev); |
| err_out_image_probe: |
| rbd_dev_image_release(rbd_dev); |
| err_out_rbd_dev: |
| rbd_dev_destroy(rbd_dev); |
| err_out_client: |
| rbd_put_client(rbdc); |
| err_out_args: |
| rbd_spec_put(spec); |
| kfree(rbd_opts); |
| goto out; |
| } |
| |
| static ssize_t rbd_add(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| if (single_major) |
| return -EINVAL; |
| |
| return do_rbd_add(bus, buf, count); |
| } |
| |
| static ssize_t rbd_add_single_major(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| return do_rbd_add(bus, buf, count); |
| } |
| |
| static void rbd_dev_remove_parent(struct rbd_device *rbd_dev) |
| { |
| while (rbd_dev->parent) { |
| struct rbd_device *first = rbd_dev; |
| struct rbd_device *second = first->parent; |
| struct rbd_device *third; |
| |
| /* |
| * Follow to the parent with no grandparent and |
| * remove it. |
| */ |
| while (second && (third = second->parent)) { |
| first = second; |
| second = third; |
| } |
| rbd_assert(second); |
| rbd_dev_image_release(second); |
| rbd_dev_destroy(second); |
| first->parent = NULL; |
| first->parent_overlap = 0; |
| |
| rbd_assert(first->parent_spec); |
| rbd_spec_put(first->parent_spec); |
| first->parent_spec = NULL; |
| } |
| } |
| |
| static ssize_t do_rbd_remove(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| struct rbd_device *rbd_dev = NULL; |
| struct list_head *tmp; |
| int dev_id; |
| char opt_buf[6]; |
| bool already = false; |
| bool force = false; |
| int ret; |
| |
| dev_id = -1; |
| opt_buf[0] = '\0'; |
| sscanf(buf, "%d %5s", &dev_id, opt_buf); |
| if (dev_id < 0) { |
| pr_err("dev_id out of range\n"); |
| return -EINVAL; |
| } |
| if (opt_buf[0] != '\0') { |
| if (!strcmp(opt_buf, "force")) { |
| force = true; |
| } else { |
| pr_err("bad remove option at '%s'\n", opt_buf); |
| return -EINVAL; |
| } |
| } |
| |
| ret = -ENOENT; |
| spin_lock(&rbd_dev_list_lock); |
| list_for_each(tmp, &rbd_dev_list) { |
| rbd_dev = list_entry(tmp, struct rbd_device, node); |
| if (rbd_dev->dev_id == dev_id) { |
| ret = 0; |
| break; |
| } |
| } |
| if (!ret) { |
| spin_lock_irq(&rbd_dev->lock); |
| if (rbd_dev->open_count && !force) |
| ret = -EBUSY; |
| else |
| already = test_and_set_bit(RBD_DEV_FLAG_REMOVING, |
| &rbd_dev->flags); |
| spin_unlock_irq(&rbd_dev->lock); |
| } |
| spin_unlock(&rbd_dev_list_lock); |
| if (ret < 0 || already) |
| return ret; |
| |
| if (force) { |
| /* |
| * Prevent new IO from being queued and wait for existing |
| * IO to complete/fail. |
| */ |
| blk_mq_freeze_queue(rbd_dev->disk->queue); |
| blk_set_queue_dying(rbd_dev->disk->queue); |
| } |
| |
| del_gendisk(rbd_dev->disk); |
| spin_lock(&rbd_dev_list_lock); |
| list_del_init(&rbd_dev->node); |
| spin_unlock(&rbd_dev_list_lock); |
| device_del(&rbd_dev->dev); |
| |
| rbd_dev_image_unlock(rbd_dev); |
| rbd_dev_device_release(rbd_dev); |
| rbd_dev_image_release(rbd_dev); |
| rbd_dev_destroy(rbd_dev); |
| return count; |
| } |
| |
| static ssize_t rbd_remove(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| if (single_major) |
| return -EINVAL; |
| |
| return do_rbd_remove(bus, buf, count); |
| } |
| |
| static ssize_t rbd_remove_single_major(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| return do_rbd_remove(bus, buf, count); |
| } |
| |
| /* |
| * create control files in sysfs |
| * /sys/bus/rbd/... |
| */ |
| static int rbd_sysfs_init(void) |
| { |
| int ret; |
| |
| ret = device_register(&rbd_root_dev); |
| if (ret < 0) |
| return ret; |
| |
| ret = bus_register(&rbd_bus_type); |
| if (ret < 0) |
| device_unregister(&rbd_root_dev); |
| |
| return ret; |
| } |
| |
| static void rbd_sysfs_cleanup(void) |
| { |
| bus_unregister(&rbd_bus_type); |
| device_unregister(&rbd_root_dev); |
| } |
| |
| static int rbd_slab_init(void) |
| { |
| rbd_assert(!rbd_img_request_cache); |
| rbd_img_request_cache = KMEM_CACHE(rbd_img_request, 0); |
| if (!rbd_img_request_cache) |
| return -ENOMEM; |
| |
| rbd_assert(!rbd_obj_request_cache); |
| rbd_obj_request_cache = KMEM_CACHE(rbd_obj_request, 0); |
| if (!rbd_obj_request_cache) |
| goto out_err; |
| |
| rbd_assert(!rbd_bio_clone); |
| rbd_bio_clone = bioset_create(BIO_POOL_SIZE, 0, 0); |
| if (!rbd_bio_clone) |
| goto out_err_clone; |
| |
| return 0; |
| |
| out_err_clone: |
| kmem_cache_destroy(rbd_obj_request_cache); |
| rbd_obj_request_cache = NULL; |
| out_err: |
| kmem_cache_destroy(rbd_img_request_cache); |
| rbd_img_request_cache = NULL; |
| return -ENOMEM; |
| } |
| |
| static void rbd_slab_exit(void) |
| { |
| rbd_assert(rbd_obj_request_cache); |
| kmem_cache_destroy(rbd_obj_request_cache); |
| rbd_obj_request_cache = NULL; |
| |
| rbd_assert(rbd_img_request_cache); |
| kmem_cache_destroy(rbd_img_request_cache); |
| rbd_img_request_cache = NULL; |
| |
| rbd_assert(rbd_bio_clone); |
| bioset_free(rbd_bio_clone); |
| rbd_bio_clone = NULL; |
| } |
| |
| static int __init rbd_init(void) |
| { |
| int rc; |
| |
| if (!libceph_compatible(NULL)) { |
| rbd_warn(NULL, "libceph incompatibility (quitting)"); |
| return -EINVAL; |
| } |
| |
| rc = rbd_slab_init(); |
| if (rc) |
| return rc; |
| |
| /* |
| * The number of active work items is limited by the number of |
| * rbd devices * queue depth, so leave @max_active at default. |
| */ |
| rbd_wq = alloc_workqueue(RBD_DRV_NAME, WQ_MEM_RECLAIM, 0); |
| if (!rbd_wq) { |
| rc = -ENOMEM; |
| goto err_out_slab; |
| } |
| |
| if (single_major) { |
| rbd_major = register_blkdev(0, RBD_DRV_NAME); |
| if (rbd_major < 0) { |
| rc = rbd_major; |
| goto err_out_wq; |
| } |
| } |
| |
| rc = rbd_sysfs_init(); |
| if (rc) |
| goto err_out_blkdev; |
| |
| if (single_major) |
| pr_info("loaded (major %d)\n", rbd_major); |
| else |
| pr_info("loaded\n"); |
| |
| return 0; |
| |
| err_out_blkdev: |
| if (single_major) |
| unregister_blkdev(rbd_major, RBD_DRV_NAME); |
| err_out_wq: |
| destroy_workqueue(rbd_wq); |
| err_out_slab: |
| rbd_slab_exit(); |
| return rc; |
| } |
| |
| static void __exit rbd_exit(void) |
| { |
| ida_destroy(&rbd_dev_id_ida); |
| rbd_sysfs_cleanup(); |
| if (single_major) |
| unregister_blkdev(rbd_major, RBD_DRV_NAME); |
| destroy_workqueue(rbd_wq); |
| rbd_slab_exit(); |
| } |
| |
| module_init(rbd_init); |
| module_exit(rbd_exit); |
| |
| MODULE_AUTHOR("Alex Elder <elder@inktank.com>"); |
| MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
| /* following authorship retained from original osdblk.c */ |
| MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| |
| MODULE_DESCRIPTION("RADOS Block Device (RBD) driver"); |
| MODULE_LICENSE("GPL"); |