| /* |
| 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/decode.h> |
| #include <linux/parser.h> |
| |
| #include <linux/kernel.h> |
| #include <linux/device.h> |
| #include <linux/module.h> |
| #include <linux/fs.h> |
| #include <linux/blkdev.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) |
| |
| /* It might be useful to have these defined elsewhere */ |
| |
| #define U8_MAX ((u8) (~0U)) |
| #define U16_MAX ((u16) (~0U)) |
| #define U32_MAX ((u32) (~0U)) |
| #define U64_MAX ((u64) (~0ULL)) |
| |
| #define RBD_DRV_NAME "rbd" |
| #define RBD_DRV_NAME_LONG "rbd (rados block device)" |
| |
| #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ |
| |
| #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 "-" |
| |
| /* 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 |
| |
| /* Feature bits */ |
| |
| #define RBD_FEATURE_LAYERING 1 |
| |
| /* Features supported by this (client software) implementation. */ |
| |
| #define RBD_FEATURES_ALL (0) |
| |
| /* |
| * An RBD device name will be "rbd#", where the "rbd" comes from |
| * RBD_DRV_NAME above, and # is a unique integer identifier. |
| * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big |
| * enough to hold all possible device names. |
| */ |
| #define DEV_NAME_LEN 32 |
| #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) |
| |
| /* |
| * block device image metadata (in-memory version) |
| */ |
| struct rbd_image_header { |
| /* These four fields never change for a given rbd image */ |
| char *object_prefix; |
| u64 features; |
| __u8 obj_order; |
| __u8 crypt_type; |
| __u8 comp_type; |
| |
| /* The remaining fields need to be updated occasionally */ |
| u64 image_size; |
| struct ceph_snap_context *snapc; |
| char *snap_names; |
| u64 *snap_sizes; |
| |
| u64 obj_version; |
| }; |
| |
| /* |
| * 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; |
| char *pool_name; |
| |
| char *image_id; |
| char *image_name; |
| |
| u64 snap_id; |
| 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 |
| }; |
| |
| struct rbd_obj_request { |
| const char *object_name; |
| u64 offset; /* object start byte */ |
| u64 length; /* bytes from offset */ |
| |
| struct rbd_img_request *img_request; |
| struct list_head links; /* img_request->obj_requests */ |
| u32 which; /* posn image request list */ |
| |
| enum obj_request_type type; |
| union { |
| struct bio *bio_list; |
| struct { |
| struct page **pages; |
| u32 page_count; |
| }; |
| }; |
| |
| struct ceph_osd_request *osd_req; |
| |
| u64 xferred; /* bytes transferred */ |
| u64 version; |
| s32 result; |
| atomic_t done; |
| |
| rbd_obj_callback_t callback; |
| struct completion completion; |
| |
| struct kref kref; |
| }; |
| |
| struct rbd_img_request { |
| struct request *rq; |
| struct rbd_device *rbd_dev; |
| u64 offset; /* starting image byte offset */ |
| u64 length; /* byte count from offset */ |
| bool write_request; /* false for read */ |
| union { |
| struct ceph_snap_context *snapc; /* for writes */ |
| u64 snap_id; /* for reads */ |
| }; |
| spinlock_t completion_lock;/* protects next_completion */ |
| u32 next_completion; |
| rbd_img_callback_t callback; |
| |
| 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) |
| |
| struct rbd_snap { |
| struct device dev; |
| const char *name; |
| u64 size; |
| struct list_head node; |
| u64 id; |
| u64 features; |
| }; |
| |
| 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 */ |
| 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; |
| |
| char *header_name; |
| |
| struct ceph_file_layout layout; |
| |
| struct ceph_osd_event *watch_event; |
| struct rbd_obj_request *watch_request; |
| |
| struct rbd_spec *parent_spec; |
| u64 parent_overlap; |
| |
| /* protects updating the header */ |
| struct rw_semaphore header_rwsem; |
| |
| struct rbd_mapping mapping; |
| |
| struct list_head node; |
| |
| /* list of snapshots */ |
| struct list_head snaps; |
| |
| /* sysfs related */ |
| struct device dev; |
| unsigned long open_count; /* protected by lock */ |
| }; |
| |
| /* |
| * Flag bits for rbd_dev->flags. If atomicity is required, |
| * rbd_dev->lock is used to protect access. |
| * |
| * Currently, only the "removing" flag (which is coupled with the |
| * "open_count" field) requires atomic access. |
| */ |
| enum rbd_dev_flags { |
| RBD_DEV_FLAG_EXISTS, /* mapped snapshot has not been deleted */ |
| RBD_DEV_FLAG_REMOVING, /* this mapping is being removed */ |
| }; |
| |
| static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ |
| |
| 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); |
| |
| static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); |
| static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); |
| |
| static void rbd_dev_release(struct device *dev); |
| static void rbd_remove_snap_dev(struct rbd_snap *snap); |
| |
| 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 struct bus_attribute rbd_bus_attrs[] = { |
| __ATTR(add, S_IWUSR, NULL, rbd_add), |
| __ATTR(remove, S_IWUSR, NULL, rbd_remove), |
| __ATTR_NULL |
| }; |
| |
| static struct bus_type rbd_bus_type = { |
| .name = "rbd", |
| .bus_attrs = rbd_bus_attrs, |
| }; |
| |
| 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 int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); |
| static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); |
| |
| 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; |
| |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| (void) get_device(&rbd_dev->dev); |
| set_device_ro(bdev, rbd_dev->mapping.read_only); |
| mutex_unlock(&ctl_mutex); |
| |
| return 0; |
| } |
| |
| static int 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); |
| |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| put_device(&rbd_dev->dev); |
| mutex_unlock(&ctl_mutex); |
| |
| return 0; |
| } |
| |
| static const struct block_device_operations rbd_bd_ops = { |
| .owner = THIS_MODULE, |
| .open = rbd_open, |
| .release = rbd_release, |
| }; |
| |
| /* |
| * Initialize an rbd client instance. |
| * We own *ceph_opts. |
| */ |
| static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) |
| { |
| struct rbd_client *rbdc; |
| int ret = -ENOMEM; |
| |
| dout("rbd_client_create\n"); |
| rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); |
| if (!rbdc) |
| goto out_opt; |
| |
| kref_init(&rbdc->kref); |
| INIT_LIST_HEAD(&rbdc->node); |
| |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| |
| rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); |
| if (IS_ERR(rbdc->client)) |
| goto out_mutex; |
| ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ |
| |
| ret = ceph_open_session(rbdc->client); |
| if (ret < 0) |
| goto out_err; |
| |
| spin_lock(&rbd_client_list_lock); |
| list_add_tail(&rbdc->node, &rbd_client_list); |
| spin_unlock(&rbd_client_list_lock); |
| |
| mutex_unlock(&ctl_mutex); |
| |
| dout("rbd_client_create created %p\n", rbdc); |
| return rbdc; |
| |
| out_err: |
| ceph_destroy_client(rbdc->client); |
| out_mutex: |
| mutex_unlock(&ctl_mutex); |
| kfree(rbdc); |
| out_opt: |
| if (ceph_opts) |
| ceph_destroy_options(ceph_opts); |
| return ERR_PTR(ret); |
| } |
| |
| /* |
| * 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)) { |
| kref_get(&client_node->kref); |
| found = true; |
| break; |
| } |
| } |
| spin_unlock(&rbd_client_list_lock); |
| |
| return found ? client_node : NULL; |
| } |
| |
| /* |
| * mount options |
| */ |
| enum { |
| Opt_last_int, |
| /* int args above */ |
| Opt_last_string, |
| /* string args above */ |
| Opt_read_only, |
| Opt_read_write, |
| /* Boolean args above */ |
| Opt_last_bool, |
| }; |
| |
| static match_table_t rbd_opts_tokens = { |
| /* 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 */ |
| /* Boolean args above */ |
| {-1, NULL} |
| }; |
| |
| struct rbd_options { |
| bool read_only; |
| }; |
| |
| #define RBD_READ_ONLY_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 < 0) |
| return -EINVAL; |
| |
| 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 if (token > Opt_last_string && token < Opt_last_bool) { |
| dout("got Boolean token %d\n", token); |
| } else { |
| dout("got token %d\n", token); |
| } |
| |
| switch (token) { |
| case Opt_read_only: |
| rbd_opts->read_only = true; |
| break; |
| case Opt_read_write: |
| rbd_opts->read_only = false; |
| break; |
| default: |
| rbd_assert(false); |
| break; |
| } |
| return 0; |
| } |
| |
| /* |
| * Get a ceph client with specific addr and configuration, if one does |
| * not exist create it. |
| */ |
| static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) |
| { |
| struct rbd_client *rbdc; |
| |
| rbdc = rbd_client_find(ceph_opts); |
| if (rbdc) /* using an existing client */ |
| ceph_destroy_options(ceph_opts); |
| else |
| rbdc = rbd_client_create(ceph_opts); |
| |
| 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("rbd_release_client %p\n", 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; |
| } |
| |
| /* |
| * Create a new header structure, translate header format from the on-disk |
| * header. |
| */ |
| static int rbd_header_from_disk(struct rbd_image_header *header, |
| struct rbd_image_header_ondisk *ondisk) |
| { |
| u32 snap_count; |
| size_t len; |
| size_t size; |
| u32 i; |
| |
| memset(header, 0, sizeof (*header)); |
| |
| snap_count = le32_to_cpu(ondisk->snap_count); |
| |
| len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); |
| header->object_prefix = kmalloc(len + 1, GFP_KERNEL); |
| if (!header->object_prefix) |
| return -ENOMEM; |
| memcpy(header->object_prefix, ondisk->object_prefix, len); |
| header->object_prefix[len] = '\0'; |
| |
| if (snap_count) { |
| u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); |
| |
| /* Save a copy of the snapshot names */ |
| |
| if (snap_names_len > (u64) SIZE_MAX) |
| return -EIO; |
| header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); |
| if (!header->snap_names) |
| goto out_err; |
| /* |
| * Note that rbd_dev_v1_header_read() 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(header->snap_names, &ondisk->snaps[snap_count], |
| snap_names_len); |
| |
| /* Record each snapshot's size */ |
| |
| size = snap_count * sizeof (*header->snap_sizes); |
| header->snap_sizes = kmalloc(size, GFP_KERNEL); |
| if (!header->snap_sizes) |
| goto out_err; |
| for (i = 0; i < snap_count; i++) |
| header->snap_sizes[i] = |
| le64_to_cpu(ondisk->snaps[i].image_size); |
| } else { |
| WARN_ON(ondisk->snap_names_len); |
| header->snap_names = NULL; |
| header->snap_sizes = NULL; |
| } |
| |
| header->features = 0; /* No features support in v1 images */ |
| header->obj_order = ondisk->options.order; |
| header->crypt_type = ondisk->options.crypt_type; |
| header->comp_type = ondisk->options.comp_type; |
| |
| /* Allocate and fill in the snapshot context */ |
| |
| header->image_size = le64_to_cpu(ondisk->image_size); |
| size = sizeof (struct ceph_snap_context); |
| size += snap_count * sizeof (header->snapc->snaps[0]); |
| header->snapc = kzalloc(size, GFP_KERNEL); |
| if (!header->snapc) |
| goto out_err; |
| |
| atomic_set(&header->snapc->nref, 1); |
| header->snapc->seq = le64_to_cpu(ondisk->snap_seq); |
| header->snapc->num_snaps = snap_count; |
| for (i = 0; i < snap_count; i++) |
| header->snapc->snaps[i] = |
| le64_to_cpu(ondisk->snaps[i].id); |
| |
| return 0; |
| |
| out_err: |
| kfree(header->snap_sizes); |
| header->snap_sizes = NULL; |
| kfree(header->snap_names); |
| header->snap_names = NULL; |
| kfree(header->object_prefix); |
| header->object_prefix = NULL; |
| |
| return -ENOMEM; |
| } |
| |
| static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) |
| { |
| struct rbd_snap *snap; |
| |
| if (snap_id == CEPH_NOSNAP) |
| return RBD_SNAP_HEAD_NAME; |
| |
| list_for_each_entry(snap, &rbd_dev->snaps, node) |
| if (snap_id == snap->id) |
| return snap->name; |
| |
| return NULL; |
| } |
| |
| static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) |
| { |
| |
| struct rbd_snap *snap; |
| |
| list_for_each_entry(snap, &rbd_dev->snaps, node) { |
| if (!strcmp(snap_name, snap->name)) { |
| rbd_dev->spec->snap_id = snap->id; |
| rbd_dev->mapping.size = snap->size; |
| rbd_dev->mapping.features = snap->features; |
| |
| return 0; |
| } |
| } |
| |
| return -ENOENT; |
| } |
| |
| static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, |
| sizeof (RBD_SNAP_HEAD_NAME))) { |
| rbd_dev->spec->snap_id = CEPH_NOSNAP; |
| rbd_dev->mapping.size = rbd_dev->header.image_size; |
| rbd_dev->mapping.features = rbd_dev->header.features; |
| ret = 0; |
| } else { |
| ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); |
| if (ret < 0) |
| goto done; |
| rbd_dev->mapping.read_only = true; |
| } |
| set_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| |
| done: |
| return ret; |
| } |
| |
| static void rbd_header_free(struct rbd_image_header *header) |
| { |
| kfree(header->object_prefix); |
| header->object_prefix = NULL; |
| kfree(header->snap_sizes); |
| header->snap_sizes = NULL; |
| kfree(header->snap_names); |
| header->snap_names = NULL; |
| ceph_put_snap_context(header->snapc); |
| header->snapc = NULL; |
| } |
| |
| static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) |
| { |
| char *name; |
| u64 segment; |
| int ret; |
| |
| name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); |
| if (!name) |
| return NULL; |
| segment = offset >> rbd_dev->header.obj_order; |
| ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", |
| rbd_dev->header.object_prefix, segment); |
| if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { |
| pr_err("error formatting segment name for #%llu (%d)\n", |
| segment, ret); |
| kfree(name); |
| name = NULL; |
| } |
| |
| return name; |
| } |
| |
| static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) |
| { |
| u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
| |
| return offset & (segment_size - 1); |
| } |
| |
| static u64 rbd_segment_length(struct rbd_device *rbd_dev, |
| u64 offset, u64 length) |
| { |
| u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; |
| |
| offset &= segment_size - 1; |
| |
| rbd_assert(length <= U64_MAX - offset); |
| if (offset + length > segment_size) |
| length = segment_size - offset; |
| |
| return length; |
| } |
| |
| /* |
| * returns the size of an object in the image |
| */ |
| static u64 rbd_obj_bytes(struct rbd_image_header *header) |
| { |
| return 1 << header->obj_order; |
| } |
| |
| /* |
| * 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; |
| unsigned long flags; |
| void *buf; |
| int i; |
| int pos = 0; |
| |
| while (chain) { |
| bio_for_each_segment(bv, chain, i) { |
| 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); |
| bvec_kunmap_irq(buf, &flags); |
| } |
| pos += bv->bv_len; |
| } |
| |
| chain = chain->bi_next; |
| } |
| } |
| |
| /* |
| * 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_vec *bv; |
| unsigned int resid; |
| unsigned short idx; |
| unsigned int voff; |
| unsigned short end_idx; |
| unsigned short vcnt; |
| struct bio *bio; |
| |
| /* Handle the easy case for the caller */ |
| |
| if (!offset && len == bio_src->bi_size) |
| return bio_clone(bio_src, gfpmask); |
| |
| if (WARN_ON_ONCE(!len)) |
| return NULL; |
| if (WARN_ON_ONCE(len > bio_src->bi_size)) |
| return NULL; |
| if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) |
| return NULL; |
| |
| /* Find first affected segment... */ |
| |
| resid = offset; |
| __bio_for_each_segment(bv, bio_src, idx, 0) { |
| if (resid < bv->bv_len) |
| break; |
| resid -= bv->bv_len; |
| } |
| voff = resid; |
| |
| /* ...and the last affected segment */ |
| |
| resid += len; |
| __bio_for_each_segment(bv, bio_src, end_idx, idx) { |
| if (resid <= bv->bv_len) |
| break; |
| resid -= bv->bv_len; |
| } |
| vcnt = end_idx - idx + 1; |
| |
| /* Build the clone */ |
| |
| bio = bio_alloc(gfpmask, (unsigned int) vcnt); |
| if (!bio) |
| return NULL; /* ENOMEM */ |
| |
| bio->bi_bdev = bio_src->bi_bdev; |
| bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); |
| bio->bi_rw = bio_src->bi_rw; |
| bio->bi_flags |= 1 << BIO_CLONED; |
| |
| /* |
| * Copy over our part of the bio_vec, then update the first |
| * and last (or only) entries. |
| */ |
| memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], |
| vcnt * sizeof (struct bio_vec)); |
| bio->bi_io_vec[0].bv_offset += voff; |
| if (vcnt > 1) { |
| bio->bi_io_vec[0].bv_len -= voff; |
| bio->bi_io_vec[vcnt - 1].bv_len = resid; |
| } else { |
| bio->bi_io_vec[0].bv_len = len; |
| } |
| |
| bio->bi_vcnt = vcnt; |
| bio->bi_size = len; |
| bio->bi_idx = 0; |
| |
| 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_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_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_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; |
| } |
| |
| static void rbd_obj_request_get(struct rbd_obj_request *obj_request) |
| { |
| 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); |
| kref_put(&obj_request->kref, rbd_obj_request_destroy); |
| } |
| |
| static void rbd_img_request_get(struct rbd_img_request *img_request) |
| { |
| kref_get(&img_request->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); |
| 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); |
| |
| rbd_obj_request_get(obj_request); |
| obj_request->img_request = img_request; |
| obj_request->which = img_request->obj_request_count; |
| rbd_assert(obj_request->which != BAD_WHICH); |
| img_request->obj_request_count++; |
| list_add_tail(&obj_request->links, &img_request->obj_requests); |
| } |
| |
| 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); |
| |
| 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_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; |
| } |
| } |
| |
| struct ceph_osd_req_op *rbd_osd_req_op_create(u16 opcode, ...) |
| { |
| struct ceph_osd_req_op *op; |
| va_list args; |
| size_t size; |
| |
| op = kzalloc(sizeof (*op), GFP_NOIO); |
| if (!op) |
| return NULL; |
| op->op = opcode; |
| va_start(args, opcode); |
| switch (opcode) { |
| case CEPH_OSD_OP_READ: |
| case CEPH_OSD_OP_WRITE: |
| /* rbd_osd_req_op_create(READ, offset, length) */ |
| /* rbd_osd_req_op_create(WRITE, offset, length) */ |
| op->extent.offset = va_arg(args, u64); |
| op->extent.length = va_arg(args, u64); |
| if (opcode == CEPH_OSD_OP_WRITE) |
| op->payload_len = op->extent.length; |
| break; |
| case CEPH_OSD_OP_STAT: |
| break; |
| case CEPH_OSD_OP_CALL: |
| /* rbd_osd_req_op_create(CALL, class, method, data, datalen) */ |
| op->cls.class_name = va_arg(args, char *); |
| size = strlen(op->cls.class_name); |
| rbd_assert(size <= (size_t) U8_MAX); |
| op->cls.class_len = size; |
| op->payload_len = size; |
| |
| op->cls.method_name = va_arg(args, char *); |
| size = strlen(op->cls.method_name); |
| rbd_assert(size <= (size_t) U8_MAX); |
| op->cls.method_len = size; |
| op->payload_len += size; |
| |
| op->cls.argc = 0; |
| op->cls.indata = va_arg(args, void *); |
| size = va_arg(args, size_t); |
| rbd_assert(size <= (size_t) U32_MAX); |
| op->cls.indata_len = (u32) size; |
| op->payload_len += size; |
| break; |
| case CEPH_OSD_OP_NOTIFY_ACK: |
| case CEPH_OSD_OP_WATCH: |
| /* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */ |
| /* rbd_osd_req_op_create(WATCH, cookie, version, flag) */ |
| op->watch.cookie = va_arg(args, u64); |
| op->watch.ver = va_arg(args, u64); |
| op->watch.ver = cpu_to_le64(op->watch.ver); |
| if (opcode == CEPH_OSD_OP_WATCH && va_arg(args, int)) |
| op->watch.flag = (u8) 1; |
| break; |
| default: |
| rbd_warn(NULL, "unsupported opcode %hu\n", opcode); |
| kfree(op); |
| op = NULL; |
| break; |
| } |
| va_end(args); |
| |
| return op; |
| } |
| |
| static void rbd_osd_req_op_destroy(struct ceph_osd_req_op *op) |
| { |
| kfree(op); |
| } |
| |
| static int rbd_obj_request_submit(struct ceph_osd_client *osdc, |
| struct rbd_obj_request *obj_request) |
| { |
| return ceph_osdc_start_request(osdc, obj_request->osd_req, false); |
| } |
| |
| static void rbd_img_request_complete(struct rbd_img_request *img_request) |
| { |
| if (img_request->callback) |
| img_request->callback(img_request); |
| else |
| rbd_img_request_put(img_request); |
| } |
| |
| /* Caller is responsible for rbd_obj_request_destroy(obj_request) */ |
| |
| static int rbd_obj_request_wait(struct rbd_obj_request *obj_request) |
| { |
| return wait_for_completion_interruptible(&obj_request->completion); |
| } |
| |
| static void obj_request_done_init(struct rbd_obj_request *obj_request) |
| { |
| atomic_set(&obj_request->done, 0); |
| smp_wmb(); |
| } |
| |
| static void obj_request_done_set(struct rbd_obj_request *obj_request) |
| { |
| atomic_set(&obj_request->done, 1); |
| smp_wmb(); |
| } |
| |
| static bool obj_request_done_test(struct rbd_obj_request *obj_request) |
| { |
| smp_rmb(); |
| return atomic_read(&obj_request->done) != 0; |
| } |
| |
| static void rbd_osd_trivial_callback(struct rbd_obj_request *obj_request, |
| struct ceph_osd_op *op) |
| { |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) |
| { |
| if (obj_request->callback) |
| obj_request->callback(obj_request); |
| else |
| complete_all(&obj_request->completion); |
| } |
| |
| static void rbd_osd_read_callback(struct rbd_obj_request *obj_request, |
| struct ceph_osd_op *op) |
| { |
| u64 xferred; |
| |
| /* |
| * We support a 64-bit length, but ultimately it has to be |
| * passed to blk_end_request(), which takes an unsigned int. |
| */ |
| xferred = le64_to_cpu(op->extent.length); |
| rbd_assert(xferred < (u64) UINT_MAX); |
| if (obj_request->result == (s32) -ENOENT) { |
| zero_bio_chain(obj_request->bio_list, 0); |
| obj_request->result = 0; |
| } else if (xferred < obj_request->length && !obj_request->result) { |
| zero_bio_chain(obj_request->bio_list, xferred); |
| xferred = obj_request->length; |
| } |
| obj_request->xferred = xferred; |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_write_callback(struct rbd_obj_request *obj_request, |
| struct ceph_osd_op *op) |
| { |
| obj_request->xferred = le64_to_cpu(op->extent.length); |
| 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, |
| struct ceph_osd_op *op) |
| { |
| obj_request_done_set(obj_request); |
| } |
| |
| static void rbd_osd_req_callback(struct ceph_osd_request *osd_req, |
| struct ceph_msg *msg) |
| { |
| struct rbd_obj_request *obj_request = osd_req->r_priv; |
| struct ceph_osd_reply_head *reply_head; |
| struct ceph_osd_op *op; |
| u32 num_ops; |
| u16 opcode; |
| |
| rbd_assert(osd_req == obj_request->osd_req); |
| rbd_assert(!!obj_request->img_request ^ |
| (obj_request->which == BAD_WHICH)); |
| |
| obj_request->xferred = le32_to_cpu(msg->hdr.data_len); |
| reply_head = msg->front.iov_base; |
| obj_request->result = (s32) le32_to_cpu(reply_head->result); |
| obj_request->version = le64_to_cpu(osd_req->r_reassert_version.version); |
| |
| num_ops = le32_to_cpu(reply_head->num_ops); |
| WARN_ON(num_ops != 1); /* For now */ |
| |
| op = &reply_head->ops[0]; |
| opcode = le16_to_cpu(op->op); |
| switch (opcode) { |
| case CEPH_OSD_OP_READ: |
| rbd_osd_read_callback(obj_request, op); |
| break; |
| case CEPH_OSD_OP_WRITE: |
| rbd_osd_write_callback(obj_request, op); |
| break; |
| case CEPH_OSD_OP_STAT: |
| rbd_osd_stat_callback(obj_request, op); |
| break; |
| case CEPH_OSD_OP_CALL: |
| case CEPH_OSD_OP_NOTIFY_ACK: |
| case CEPH_OSD_OP_WATCH: |
| rbd_osd_trivial_callback(obj_request, op); |
| break; |
| default: |
| rbd_warn(NULL, "%s: unsupported op %hu\n", |
| obj_request->object_name, (unsigned short) opcode); |
| break; |
| } |
| |
| if (obj_request_done_test(obj_request)) |
| rbd_obj_request_complete(obj_request); |
| } |
| |
| static struct ceph_osd_request *rbd_osd_req_create( |
| struct rbd_device *rbd_dev, |
| bool write_request, |
| struct rbd_obj_request *obj_request, |
| struct ceph_osd_req_op *op) |
| { |
| struct rbd_img_request *img_request = obj_request->img_request; |
| struct ceph_snap_context *snapc = NULL; |
| struct ceph_osd_client *osdc; |
| struct ceph_osd_request *osd_req; |
| struct timespec now; |
| struct timespec *mtime; |
| u64 snap_id = CEPH_NOSNAP; |
| u64 offset = obj_request->offset; |
| u64 length = obj_request->length; |
| |
| if (img_request) { |
| rbd_assert(img_request->write_request == write_request); |
| if (img_request->write_request) |
| snapc = img_request->snapc; |
| else |
| snap_id = img_request->snap_id; |
| } |
| |
| /* Allocate and initialize the request, for the single op */ |
| |
| osdc = &rbd_dev->rbd_client->client->osdc; |
| osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_ATOMIC); |
| if (!osd_req) |
| return NULL; /* ENOMEM */ |
| |
| 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: |
| rbd_assert(obj_request->bio_list != NULL); |
| osd_req->r_bio = obj_request->bio_list; |
| break; |
| case OBJ_REQUEST_PAGES: |
| osd_req->r_pages = obj_request->pages; |
| osd_req->r_num_pages = obj_request->page_count; |
| osd_req->r_page_alignment = offset & ~PAGE_MASK; |
| break; |
| } |
| |
| if (write_request) { |
| osd_req->r_flags = CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK; |
| now = CURRENT_TIME; |
| mtime = &now; |
| } else { |
| osd_req->r_flags = CEPH_OSD_FLAG_READ; |
| mtime = NULL; /* not needed for reads */ |
| offset = 0; /* These are not used... */ |
| length = 0; /* ...for osd read requests */ |
| } |
| |
| osd_req->r_callback = rbd_osd_req_callback; |
| osd_req->r_priv = obj_request; |
| |
| osd_req->r_oid_len = strlen(obj_request->object_name); |
| rbd_assert(osd_req->r_oid_len < sizeof (osd_req->r_oid)); |
| memcpy(osd_req->r_oid, obj_request->object_name, osd_req->r_oid_len); |
| |
| osd_req->r_file_layout = rbd_dev->layout; /* struct */ |
| |
| /* osd_req will get its own reference to snapc (if non-null) */ |
| |
| ceph_osdc_build_request(osd_req, offset, length, 1, op, |
| snapc, snap_id, mtime); |
| |
| return osd_req; |
| } |
| |
| static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) |
| { |
| ceph_osdc_put_request(osd_req); |
| } |
| |
| /* object_name is assumed to be a non-null pointer and NUL-terminated */ |
| |
| static struct rbd_obj_request *rbd_obj_request_create(const char *object_name, |
| u64 offset, u64 length, |
| enum obj_request_type type) |
| { |
| struct rbd_obj_request *obj_request; |
| size_t size; |
| char *name; |
| |
| rbd_assert(obj_request_type_valid(type)); |
| |
| size = strlen(object_name) + 1; |
| obj_request = kzalloc(sizeof (*obj_request) + size, GFP_KERNEL); |
| if (!obj_request) |
| return NULL; |
| |
| name = (char *)(obj_request + 1); |
| obj_request->object_name = memcpy(name, object_name, size); |
| obj_request->offset = offset; |
| obj_request->length = length; |
| obj_request->which = BAD_WHICH; |
| obj_request->type = type; |
| INIT_LIST_HEAD(&obj_request->links); |
| obj_request_done_init(obj_request); |
| init_completion(&obj_request->completion); |
| kref_init(&obj_request->kref); |
| |
| 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); |
| |
| 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: |
| if (obj_request->pages) |
| ceph_release_page_vector(obj_request->pages, |
| obj_request->page_count); |
| break; |
| } |
| |
| kfree(obj_request); |
| } |
| |
| /* |
| * 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). |
| */ |
| struct rbd_img_request *rbd_img_request_create(struct rbd_device *rbd_dev, |
| u64 offset, u64 length, |
| bool write_request) |
| { |
| struct rbd_img_request *img_request; |
| struct ceph_snap_context *snapc = NULL; |
| |
| img_request = kmalloc(sizeof (*img_request), GFP_ATOMIC); |
| if (!img_request) |
| return NULL; |
| |
| if (write_request) { |
| down_read(&rbd_dev->header_rwsem); |
| snapc = ceph_get_snap_context(rbd_dev->header.snapc); |
| up_read(&rbd_dev->header_rwsem); |
| if (WARN_ON(!snapc)) { |
| kfree(img_request); |
| return NULL; /* Shouldn't happen */ |
| } |
| } |
| |
| img_request->rq = NULL; |
| img_request->rbd_dev = rbd_dev; |
| img_request->offset = offset; |
| img_request->length = length; |
| img_request->write_request = write_request; |
| if (write_request) |
| img_request->snapc = snapc; |
| else |
| img_request->snap_id = rbd_dev->spec->snap_id; |
| spin_lock_init(&img_request->completion_lock); |
| img_request->next_completion = 0; |
| img_request->callback = NULL; |
| img_request->obj_request_count = 0; |
| INIT_LIST_HEAD(&img_request->obj_requests); |
| kref_init(&img_request->kref); |
| |
| rbd_img_request_get(img_request); /* Avoid a warning */ |
| rbd_img_request_put(img_request); /* TEMPORARY */ |
| |
| 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); |
| |
| 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->write_request) |
| ceph_put_snap_context(img_request->snapc); |
| |
| kfree(img_request); |
| } |
| |
| static int rbd_img_request_fill_bio(struct rbd_img_request *img_request, |
| struct bio *bio_list) |
| { |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| struct rbd_obj_request *obj_request = NULL; |
| struct rbd_obj_request *next_obj_request; |
| unsigned int bio_offset; |
| u64 image_offset; |
| u64 resid; |
| u16 opcode; |
| |
| opcode = img_request->write_request ? CEPH_OSD_OP_WRITE |
| : CEPH_OSD_OP_READ; |
| bio_offset = 0; |
| image_offset = img_request->offset; |
| rbd_assert(image_offset == bio_list->bi_sector << SECTOR_SHIFT); |
| resid = img_request->length; |
| while (resid) { |
| const char *object_name; |
| unsigned int clone_size; |
| struct ceph_osd_req_op *op; |
| u64 offset; |
| u64 length; |
| |
| object_name = rbd_segment_name(rbd_dev, image_offset); |
| if (!object_name) |
| goto out_unwind; |
| offset = rbd_segment_offset(rbd_dev, image_offset); |
| length = rbd_segment_length(rbd_dev, image_offset, resid); |
| obj_request = rbd_obj_request_create(object_name, |
| offset, length, |
| OBJ_REQUEST_BIO); |
| kfree(object_name); /* object request has its own copy */ |
| if (!obj_request) |
| goto out_unwind; |
| |
| 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_ATOMIC); |
| if (!obj_request->bio_list) |
| goto out_partial; |
| |
| /* |
| * Build up the op to use in building the osd |
| * request. Note that the contents of the op are |
| * copied by rbd_osd_req_create(). |
| */ |
| op = rbd_osd_req_op_create(opcode, offset, length); |
| if (!op) |
| goto out_partial; |
| obj_request->osd_req = rbd_osd_req_create(rbd_dev, |
| img_request->write_request, |
| obj_request, op); |
| rbd_osd_req_op_destroy(op); |
| if (!obj_request->osd_req) |
| goto out_partial; |
| /* status and version are initially zero-filled */ |
| |
| rbd_img_obj_request_add(img_request, obj_request); |
| |
| image_offset += length; |
| resid -= length; |
| } |
| |
| return 0; |
| |
| out_partial: |
| rbd_obj_request_put(obj_request); |
| out_unwind: |
| for_each_obj_request_safe(img_request, obj_request, next_obj_request) |
| rbd_obj_request_put(obj_request); |
| |
| return -ENOMEM; |
| } |
| |
| 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; |
| |
| img_request = obj_request->img_request; |
| rbd_assert(img_request != NULL); |
| rbd_assert(img_request->rq != NULL); |
| rbd_assert(which != BAD_WHICH); |
| rbd_assert(which < img_request->obj_request_count); |
| rbd_assert(which >= img_request->next_completion); |
| |
| spin_lock_irq(&img_request->completion_lock); |
| if (which != img_request->next_completion) |
| goto out; |
| |
| for_each_obj_request_from(img_request, obj_request) { |
| unsigned int xferred; |
| int result; |
| |
| rbd_assert(more); |
| rbd_assert(which < img_request->obj_request_count); |
| |
| if (!obj_request_done_test(obj_request)) |
| break; |
| |
| rbd_assert(obj_request->xferred <= (u64) UINT_MAX); |
| xferred = (unsigned int) obj_request->xferred; |
| result = (int) obj_request->result; |
| if (result) |
| rbd_warn(NULL, "obj_request %s result %d xferred %u\n", |
| img_request->write_request ? "write" : "read", |
| result, xferred); |
| |
| more = blk_end_request(img_request->rq, result, xferred); |
| which++; |
| } |
| rbd_assert(more ^ (which == img_request->obj_request_count)); |
| img_request->next_completion = which; |
| out: |
| spin_unlock_irq(&img_request->completion_lock); |
| |
| if (!more) |
| rbd_img_request_complete(img_request); |
| } |
| |
| static int rbd_img_request_submit(struct rbd_img_request *img_request) |
| { |
| struct rbd_device *rbd_dev = img_request->rbd_dev; |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct rbd_obj_request *obj_request; |
| |
| for_each_obj_request(img_request, obj_request) { |
| int ret; |
| |
| obj_request->callback = rbd_img_obj_callback; |
| ret = rbd_obj_request_submit(osdc, obj_request); |
| if (ret) |
| return ret; |
| /* |
| * The image request has its own reference to each |
| * of its object requests, so we can safely drop the |
| * initial one here. |
| */ |
| rbd_obj_request_put(obj_request); |
| } |
| |
| return 0; |
| } |
| |
| static int rbd_obj_notify_ack(struct rbd_device *rbd_dev, |
| u64 ver, u64 notify_id) |
| { |
| struct rbd_obj_request *obj_request; |
| struct ceph_osd_req_op *op; |
| struct ceph_osd_client *osdc; |
| int ret; |
| |
| obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
| OBJ_REQUEST_NODATA); |
| if (!obj_request) |
| return -ENOMEM; |
| |
| ret = -ENOMEM; |
| op = rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK, notify_id, ver); |
| if (!op) |
| goto out; |
| obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
| obj_request, op); |
| rbd_osd_req_op_destroy(op); |
| if (!obj_request->osd_req) |
| goto out; |
| |
| osdc = &rbd_dev->rbd_client->client->osdc; |
| obj_request->callback = rbd_obj_request_put; |
| ret = rbd_obj_request_submit(osdc, obj_request); |
| out: |
| if (ret) |
| rbd_obj_request_put(obj_request); |
| |
| return ret; |
| } |
| |
| static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) |
| { |
| struct rbd_device *rbd_dev = (struct rbd_device *)data; |
| u64 hver; |
| int rc; |
| |
| if (!rbd_dev) |
| return; |
| |
| dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", |
| rbd_dev->header_name, (unsigned long long) notify_id, |
| (unsigned int) opcode); |
| rc = rbd_dev_refresh(rbd_dev, &hver); |
| if (rc) |
| rbd_warn(rbd_dev, "got notification but failed to " |
| " update snaps: %d\n", rc); |
| |
| rbd_obj_notify_ack(rbd_dev, hver, notify_id); |
| } |
| |
| /* |
| * Request sync osd watch/unwatch. The value of "start" determines |
| * whether a watch request is being initiated or torn down. |
| */ |
| static int rbd_dev_header_watch_sync(struct rbd_device *rbd_dev, int start) |
| { |
| struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; |
| struct rbd_obj_request *obj_request; |
| struct ceph_osd_req_op *op; |
| int ret; |
| |
| rbd_assert(start ^ !!rbd_dev->watch_event); |
| rbd_assert(start ^ !!rbd_dev->watch_request); |
| |
| if (start) { |
| ret = ceph_osdc_create_event(osdc, rbd_watch_cb, rbd_dev, |
| &rbd_dev->watch_event); |
| if (ret < 0) |
| return ret; |
| rbd_assert(rbd_dev->watch_event != NULL); |
| } |
| |
| ret = -ENOMEM; |
| obj_request = rbd_obj_request_create(rbd_dev->header_name, 0, 0, |
| OBJ_REQUEST_NODATA); |
| if (!obj_request) |
| goto out_cancel; |
| |
| op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH, |
| rbd_dev->watch_event->cookie, |
| rbd_dev->header.obj_version, start); |
| if (!op) |
| goto out_cancel; |
| obj_request->osd_req = rbd_osd_req_create(rbd_dev, true, |
| obj_request, op); |
| rbd_osd_req_op_destroy(op); |
| if (!obj_request->osd_req) |
| goto out_cancel; |
| |
| if (start) |
| ceph_osdc_set_request_linger(osdc, obj_request->osd_req); |
| else |
| ceph_osdc_unregister_linger_request(osdc, |
| rbd_dev->watch_request->osd_req); |
| ret = rbd_obj_request_submit(osdc, obj_request); |
| if (ret) |
| goto out_cancel; |
| ret = rbd_obj_request_wait(obj_request); |
| if (ret) |
| goto out_cancel; |
| ret = obj_request->result; |
| if (ret) |
| goto out_cancel; |
| |
| /* |
| * A watch request is set to linger, so the underlying osd |
| * request won't go away until we unregister it. We retain |
| * a pointer to the object request during that time (in |
| * rbd_dev->watch_request), so we'll keep a reference to |
| * it. We'll drop that reference (below) after we've |
| * unregistered it. |
| */ |
| if (start) { |
| rbd_dev->watch_request = obj_request; |
| |
| return 0; |
| } |
| |
| /* We have successfully torn down the watch request */ |
| |
| rbd_obj_request_put(rbd_dev->watch_request); |
| rbd_dev->watch_request = NULL; |
| out_cancel: |
| /* Cancel the event if we're tearing down, or on error */ |
| ceph_osdc_cancel_event(rbd_dev->watch_event); |
| rbd_dev->watch_event = NULL; |
| if (obj_request) |
| rbd_obj_request_put(obj_request); |
| |
| return ret; |
| } |
| |
| /* |
| * Synchronous osd object method call |
| */ |
| static int rbd_obj_method_sync(struct rbd_device *rbd_dev, |
| const char *object_name, |
| const char *class_name, |
| const char *method_name, |
| const char *outbound, |
| size_t outbound_size, |
| char *inbound, |
| size_t inbound_size, |
| u64 *version) |
| { |
| struct rbd_obj_request *obj_request; |
| struct ceph_osd_client *osdc; |
| struct ceph_osd_req_op *op; |
| struct page **pages; |
| u32 page_count; |
| int ret; |
| |
| /* |
| * Method calls are ultimately read operations but they |
| * don't involve object data (so no offset or length). |
| * 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. |
| */ |
| page_count = (u32) calc_pages_for(0, inbound_size); |
| pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| if (IS_ERR(pages)) |
| return PTR_ERR(pages); |
| |
| ret = -ENOMEM; |
| obj_request = rbd_obj_request_create(object_name, 0, 0, |
| OBJ_REQUEST_PAGES); |
| if (!obj_request) |
| goto out; |
| |
| obj_request->pages = pages; |
| obj_request->page_count = page_count; |
| |
| op = rbd_osd_req_op_create(CEPH_OSD_OP_CALL, class_name, |
| method_name, outbound, outbound_size); |
| if (!op) |
| goto out; |
| obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
| obj_request, op); |
| rbd_osd_req_op_destroy(op); |
| if (!obj_request->osd_req) |
| goto out; |
| |
| osdc = &rbd_dev->rbd_client->client->osdc; |
| ret = rbd_obj_request_submit(osdc, obj_request); |
| if (ret) |
| goto out; |
| ret = rbd_obj_request_wait(obj_request); |
| if (ret) |
| goto out; |
| |
| ret = obj_request->result; |
| if (ret < 0) |
| goto out; |
| ret = ceph_copy_from_page_vector(pages, inbound, 0, |
| obj_request->xferred); |
| if (version) |
| *version = obj_request->version; |
| out: |
| if (obj_request) |
| rbd_obj_request_put(obj_request); |
| else |
| ceph_release_page_vector(pages, page_count); |
| |
| return ret; |
| } |
| |
| static void rbd_request_fn(struct request_queue *q) |
| { |
| struct rbd_device *rbd_dev = q->queuedata; |
| bool read_only = rbd_dev->mapping.read_only; |
| struct request *rq; |
| int result; |
| |
| while ((rq = blk_fetch_request(q))) { |
| bool write_request = rq_data_dir(rq) == WRITE; |
| struct rbd_img_request *img_request; |
| u64 offset; |
| u64 length; |
| |
| /* Ignore any non-FS requests that filter through. */ |
| |
| if (rq->cmd_type != REQ_TYPE_FS) { |
| __blk_end_request_all(rq, 0); |
| continue; |
| } |
| |
| spin_unlock_irq(q->queue_lock); |
| |
| /* Disallow writes to a read-only device */ |
| |
| if (write_request) { |
| result = -EROFS; |
| if (read_only) |
| goto end_request; |
| 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 end_request; |
| } |
| |
| offset = (u64) blk_rq_pos(rq) << SECTOR_SHIFT; |
| length = (u64) blk_rq_bytes(rq); |
| |
| result = -EINVAL; |
| if (WARN_ON(offset && length > U64_MAX - offset + 1)) |
| goto end_request; /* Shouldn't happen */ |
| |
| result = -ENOMEM; |
| img_request = rbd_img_request_create(rbd_dev, offset, length, |
| write_request); |
| if (!img_request) |
| goto end_request; |
| |
| img_request->rq = rq; |
| |
| result = rbd_img_request_fill_bio(img_request, rq->bio); |
| if (!result) |
| result = rbd_img_request_submit(img_request); |
| if (result) |
| rbd_img_request_put(img_request); |
| end_request: |
| spin_lock_irq(q->queue_lock); |
| if (result < 0) { |
| rbd_warn(rbd_dev, "obj_request %s result %d\n", |
| write_request ? "write" : "read", result); |
| __blk_end_request_all(rq, result); |
| } |
| } |
| } |
| |
| /* |
| * a queue callback. Makes sure that we don't create a bio that spans across |
| * multiple osd objects. One exception would be with a single page bios, |
| * which we handle later at bio_chain_clone_range() |
| */ |
| static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, |
| struct bio_vec *bvec) |
| { |
| struct rbd_device *rbd_dev = q->queuedata; |
| sector_t sector_offset; |
| sector_t sectors_per_obj; |
| sector_t obj_sector_offset; |
| int ret; |
| |
| /* |
| * Find how far into its rbd object the partition-relative |
| * bio start sector is to offset relative to the enclosing |
| * device. |
| */ |
| sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; |
| sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); |
| obj_sector_offset = sector_offset & (sectors_per_obj - 1); |
| |
| /* |
| * Compute the number of bytes from that offset to the end |
| * of the object. Account for what's already used by the bio. |
| */ |
| ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; |
| if (ret > bmd->bi_size) |
| ret -= bmd->bi_size; |
| else |
| ret = 0; |
| |
| /* |
| * Don't send back more than was asked for. And if the bio |
| * was empty, let the whole thing through because: "Note |
| * that a block device *must* allow a single page to be |
| * added to an empty bio." |
| */ |
| rbd_assert(bvec->bv_len <= PAGE_SIZE); |
| if (ret > (int) bvec->bv_len || !bmd->bi_size) |
| ret = (int) bvec->bv_len; |
| |
| return ret; |
| } |
| |
| static void rbd_free_disk(struct rbd_device *rbd_dev) |
| { |
| struct gendisk *disk = rbd_dev->disk; |
| |
| if (!disk) |
| return; |
| |
| if (disk->flags & GENHD_FL_UP) |
| del_gendisk(disk); |
| if (disk->queue) |
| blk_cleanup_queue(disk->queue); |
| put_disk(disk); |
| } |
| |
| static int rbd_obj_read_sync(struct rbd_device *rbd_dev, |
| const char *object_name, |
| u64 offset, u64 length, |
| char *buf, u64 *version) |
| |
| { |
| struct ceph_osd_req_op *op; |
| struct rbd_obj_request *obj_request; |
| struct ceph_osd_client *osdc; |
| struct page **pages = NULL; |
| u32 page_count; |
| size_t size; |
| int ret; |
| |
| page_count = (u32) calc_pages_for(offset, length); |
| pages = ceph_alloc_page_vector(page_count, GFP_KERNEL); |
| if (IS_ERR(pages)) |
| ret = PTR_ERR(pages); |
| |
| ret = -ENOMEM; |
| obj_request = rbd_obj_request_create(object_name, offset, length, |
| OBJ_REQUEST_PAGES); |
| if (!obj_request) |
| goto out; |
| |
| obj_request->pages = pages; |
| obj_request->page_count = page_count; |
| |
| op = rbd_osd_req_op_create(CEPH_OSD_OP_READ, offset, length); |
| if (!op) |
| goto out; |
| obj_request->osd_req = rbd_osd_req_create(rbd_dev, false, |
| obj_request, op); |
| rbd_osd_req_op_destroy(op); |
| if (!obj_request->osd_req) |
| goto out; |
| |
| osdc = &rbd_dev->rbd_client->client->osdc; |
| ret = rbd_obj_request_submit(osdc, obj_request); |
| if (ret) |
| goto out; |
| ret = rbd_obj_request_wait(obj_request); |
| if (ret) |
| goto out; |
| |
| ret = obj_request->result; |
| if (ret < 0) |
| goto out; |
| |
| rbd_assert(obj_request->xferred <= (u64) SIZE_MAX); |
| size = (size_t) obj_request->xferred; |
| ret = ceph_copy_from_page_vector(pages, buf, 0, size); |
| if (version) |
| *version = obj_request->version; |
| out: |
| if (obj_request) |
| rbd_obj_request_put(obj_request); |
| else |
| ceph_release_page_vector(pages, page_count); |
| |
| return ret; |
| } |
| |
| /* |
| * Read the complete header for the given rbd device. |
| * |
| * Returns a pointer to a dynamically-allocated buffer containing |
| * the complete and validated header. Caller can pass the address |
| * of a variable that will be filled in with the version of the |
| * header object at the time it was read. |
| * |
| * Returns a pointer-coded errno if a failure occurs. |
| */ |
| static struct rbd_image_header_ondisk * |
| rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) |
| { |
| 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 ERR_PTR(-ENOMEM); |
| |
| ret = rbd_obj_read_sync(rbd_dev, rbd_dev->header_name, |
| 0, size, |
| (char *) ondisk, version); |
| |
| if (ret < 0) |
| goto out_err; |
| if (WARN_ON((size_t) ret < size)) { |
| ret = -ENXIO; |
| rbd_warn(rbd_dev, "short header read (want %zd got %d)", |
| size, ret); |
| goto out_err; |
| } |
| if (!rbd_dev_ondisk_valid(ondisk)) { |
| ret = -ENXIO; |
| rbd_warn(rbd_dev, "invalid header"); |
| goto out_err; |
| } |
| |
| 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); |
| |
| return ondisk; |
| |
| out_err: |
| kfree(ondisk); |
| |
| return ERR_PTR(ret); |
| } |
| |
| /* |
| * reload the ondisk the header |
| */ |
| static int rbd_read_header(struct rbd_device *rbd_dev, |
| struct rbd_image_header *header) |
| { |
| struct rbd_image_header_ondisk *ondisk; |
| u64 ver = 0; |
| int ret; |
| |
| ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); |
| if (IS_ERR(ondisk)) |
| return PTR_ERR(ondisk); |
| ret = rbd_header_from_disk(header, ondisk); |
| if (ret >= 0) |
| header->obj_version = ver; |
| kfree(ondisk); |
| |
| return ret; |
| } |
| |
| static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) |
| { |
| struct rbd_snap *snap; |
| struct rbd_snap *next; |
| |
| list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) |
| rbd_remove_snap_dev(snap); |
| } |
| |
| static void rbd_update_mapping_size(struct rbd_device *rbd_dev) |
| { |
| sector_t size; |
| |
| if (rbd_dev->spec->snap_id != CEPH_NOSNAP) |
| return; |
| |
| size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; |
| dout("setting size to %llu sectors", (unsigned long long) size); |
| rbd_dev->mapping.size = (u64) size; |
| set_capacity(rbd_dev->disk, size); |
| } |
| |
| /* |
| * only read the first part of the ondisk header, without the snaps info |
| */ |
| static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) |
| { |
| int ret; |
| struct rbd_image_header h; |
| |
| ret = rbd_read_header(rbd_dev, &h); |
| if (ret < 0) |
| return ret; |
| |
| down_write(&rbd_dev->header_rwsem); |
| |
| /* Update image size, and check for resize of mapped image */ |
| rbd_dev->header.image_size = h.image_size; |
| rbd_update_mapping_size(rbd_dev); |
| |
| /* rbd_dev->header.object_prefix shouldn't change */ |
| kfree(rbd_dev->header.snap_sizes); |
| kfree(rbd_dev->header.snap_names); |
| /* osd requests may still refer to snapc */ |
| ceph_put_snap_context(rbd_dev->header.snapc); |
| |
| if (hver) |
| *hver = h.obj_version; |
| rbd_dev->header.obj_version = h.obj_version; |
| rbd_dev->header.image_size = h.image_size; |
| rbd_dev->header.snapc = h.snapc; |
| rbd_dev->header.snap_names = h.snap_names; |
| rbd_dev->header.snap_sizes = h.snap_sizes; |
| /* Free the extra copy of the object prefix */ |
| WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); |
| kfree(h.object_prefix); |
| |
| ret = rbd_dev_snaps_update(rbd_dev); |
| if (!ret) |
| ret = rbd_dev_snaps_register(rbd_dev); |
| |
| up_write(&rbd_dev->header_rwsem); |
| |
| return ret; |
| } |
| |
| static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) |
| { |
| int ret; |
| |
| rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| if (rbd_dev->image_format == 1) |
| ret = rbd_dev_v1_refresh(rbd_dev, hver); |
| else |
| ret = rbd_dev_v2_refresh(rbd_dev, hver); |
| mutex_unlock(&ctl_mutex); |
| |
| return ret; |
| } |
| |
| static int rbd_init_disk(struct rbd_device *rbd_dev) |
| { |
| struct gendisk *disk; |
| struct request_queue *q; |
| u64 segment_size; |
| |
| /* create gendisk info */ |
| disk = alloc_disk(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 = 0; |
| disk->fops = &rbd_bd_ops; |
| disk->private_data = rbd_dev; |
| |
| q = blk_init_queue(rbd_request_fn, &rbd_dev->lock); |
| if (!q) |
| goto out_disk; |
| |
| /* We use the default size, but let's be explicit about it. */ |
| blk_queue_physical_block_size(q, SECTOR_SIZE); |
| |
| /* set io sizes to object size */ |
| segment_size = rbd_obj_bytes(&rbd_dev->header); |
| blk_queue_max_hw_sectors(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); |
| |
| blk_queue_merge_bvec(q, rbd_merge_bvec); |
| disk->queue = q; |
| |
| q->queuedata = rbd_dev; |
| |
| rbd_dev->disk = disk; |
| |
| set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); |
| |
| return 0; |
| out_disk: |
| put_disk(disk); |
| |
| return -ENOMEM; |
| } |
| |
| /* |
| 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); |
| sector_t size; |
| |
| down_read(&rbd_dev->header_rwsem); |
| size = get_capacity(rbd_dev->disk); |
| up_read(&rbd_dev->header_rwsem); |
| |
| return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_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); |
| |
| return sprintf(buf, "%d\n", rbd_dev->major); |
| } |
| |
| 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_id(rbd_dev->rbd_client->client)); |
| } |
| |
| 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); |
| } |
| |
| /* |
| * For an rbd v2 image, shows the pool id, image id, and snapshot id |
| * for the parent image. If there is no parent, simply 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); |
| struct rbd_spec *spec = rbd_dev->parent_spec; |
| int count; |
| char *bufp = buf; |
| |
| if (!spec) |
| return sprintf(buf, "(no parent image)\n"); |
| |
| count = sprintf(bufp, "pool_id %llu\npool_name %s\n", |
| (unsigned long long) spec->pool_id, spec->pool_name); |
| if (count < 0) |
| return count; |
| bufp += count; |
| |
| count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, |
| spec->image_name ? spec->image_name : "(unknown)"); |
| if (count < 0) |
| return count; |
| bufp += count; |
| |
| count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", |
| (unsigned long long) spec->snap_id, spec->snap_name); |
| if (count < 0) |
| return count; |
| bufp += count; |
| |
| count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); |
| if (count < 0) |
| return count; |
| bufp += count; |
| |
| return (ssize_t) (bufp - buf); |
| } |
| |
| 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, NULL); |
| |
| return ret < 0 ? ret : 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(client_id, S_IRUGO, rbd_client_id_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(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_client_id.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_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_sysfs_dev_release(struct device *dev) |
| { |
| } |
| |
| static struct device_type rbd_device_type = { |
| .name = "rbd", |
| .groups = rbd_attr_groups, |
| .release = rbd_sysfs_dev_release, |
| }; |
| |
| |
| /* |
| sysfs - snapshots |
| */ |
| |
| static ssize_t rbd_snap_size_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| |
| return sprintf(buf, "%llu\n", (unsigned long long)snap->size); |
| } |
| |
| static ssize_t rbd_snap_id_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| |
| return sprintf(buf, "%llu\n", (unsigned long long)snap->id); |
| } |
| |
| static ssize_t rbd_snap_features_show(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| |
| return sprintf(buf, "0x%016llx\n", |
| (unsigned long long) snap->features); |
| } |
| |
| static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); |
| static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); |
| static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); |
| |
| static struct attribute *rbd_snap_attrs[] = { |
| &dev_attr_snap_size.attr, |
| &dev_attr_snap_id.attr, |
| &dev_attr_snap_features.attr, |
| NULL, |
| }; |
| |
| static struct attribute_group rbd_snap_attr_group = { |
| .attrs = rbd_snap_attrs, |
| }; |
| |
| static void rbd_snap_dev_release(struct device *dev) |
| { |
| struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); |
| kfree(snap->name); |
| kfree(snap); |
| } |
| |
| static const struct attribute_group *rbd_snap_attr_groups[] = { |
| &rbd_snap_attr_group, |
| NULL |
| }; |
| |
| static struct device_type rbd_snap_device_type = { |
| .groups = rbd_snap_attr_groups, |
| .release = rbd_snap_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; |
| kref_init(&spec->kref); |
| |
| rbd_spec_put(rbd_spec_get(spec)); /* TEMPORARY */ |
| |
| 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); |
| } |
| |
| 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); |
| rbd_dev->flags = 0; |
| INIT_LIST_HEAD(&rbd_dev->node); |
| INIT_LIST_HEAD(&rbd_dev->snaps); |
| init_rwsem(&rbd_dev->header_rwsem); |
| |
| rbd_dev->spec = spec; |
| rbd_dev->rbd_client = rbdc; |
| |
| /* Initialize the layout used for all rbd requests */ |
| |
| rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| rbd_dev->layout.fl_stripe_count = cpu_to_le32(1); |
| rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); |
| rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id); |
| |
| return rbd_dev; |
| } |
| |
| static void rbd_dev_destroy(struct rbd_device *rbd_dev) |
| { |
| rbd_spec_put(rbd_dev->parent_spec); |
| kfree(rbd_dev->header_name); |
| rbd_put_client(rbd_dev->rbd_client); |
| rbd_spec_put(rbd_dev->spec); |
| kfree(rbd_dev); |
| } |
| |
| static bool rbd_snap_registered(struct rbd_snap *snap) |
| { |
| bool ret = snap->dev.type == &rbd_snap_device_type; |
| bool reg = device_is_registered(&snap->dev); |
| |
| rbd_assert(!ret ^ reg); |
| |
| return ret; |
| } |
| |
| static void rbd_remove_snap_dev(struct rbd_snap *snap) |
| { |
| list_del(&snap->node); |
| if (device_is_registered(&snap->dev)) |
| device_unregister(&snap->dev); |
| } |
| |
| static int rbd_register_snap_dev(struct rbd_snap *snap, |
| struct device *parent) |
| { |
| struct device *dev = &snap->dev; |
| int ret; |
| |
| dev->type = &rbd_snap_device_type; |
| dev->parent = parent; |
| dev->release = rbd_snap_dev_release; |
| dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); |
| dout("%s: registering device for snapshot %s\n", __func__, snap->name); |
| |
| ret = device_register(dev); |
| |
| return ret; |
| } |
| |
| static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, |
| const char *snap_name, |
| u64 snap_id, u64 snap_size, |
| u64 snap_features) |
| { |
| struct rbd_snap *snap; |
| int ret; |
| |
| snap = kzalloc(sizeof (*snap), GFP_KERNEL); |
| if (!snap) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = -ENOMEM; |
| snap->name = kstrdup(snap_name, GFP_KERNEL); |
| if (!snap->name) |
| goto err; |
| |
| snap->id = snap_id; |
| snap->size = snap_size; |
| snap->features = snap_features; |
| |
| return snap; |
| |
| err: |
| kfree(snap->name); |
| kfree(snap); |
| |
| return ERR_PTR(ret); |
| } |
| |
| static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, |
| u64 *snap_size, u64 *snap_features) |
| { |
| char *snap_name; |
| |
| rbd_assert(which < rbd_dev->header.snapc->num_snaps); |
| |
| *snap_size = rbd_dev->header.snap_sizes[which]; |
| *snap_features = 0; /* No features for v1 */ |
| |
| /* 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 snap_name; |
| } |
| |
| /* |
| * 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_name, |
| "rbd", "get_size", |
| (char *) &snapid, sizeof (snapid), |
| (char *) &size_buf, sizeof (size_buf), NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| return ret; |
| |
| *order = size_buf.order; |
| *snap_size = le64_to_cpu(size_buf.size); |
| |
| dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", |
| (unsigned long long) snap_id, (unsigned int) *order, |
| (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_name, |
| "rbd", "get_object_prefix", |
| NULL, 0, |
| reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| ret = 0; /* rbd_obj_method_sync() can return positive */ |
| |
| p = reply_buf; |
| rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, |
| p + RBD_OBJ_PREFIX_LEN_MAX, |
| NULL, GFP_NOIO); |
| |
| 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; |
| } features_buf = { 0 }; |
| u64 incompat; |
| int ret; |
| |
| ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
| "rbd", "get_features", |
| (char *) &snapid, sizeof (snapid), |
| (char *) &features_buf, sizeof (features_buf), |
| NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| return ret; |
| |
| incompat = le64_to_cpu(features_buf.incompat); |
| if (incompat & ~RBD_FEATURES_ALL) |
| 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; |
| char *image_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(CEPH_NOSNAP); |
| ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
| "rbd", "get_parent", |
| (char *) &snapid, sizeof (snapid), |
| (char *) reply_buf, size, NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out_err; |
| |
| ret = -ERANGE; |
| p = reply_buf; |
| end = (char *) reply_buf + size; |
| ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); |
| if (parent_spec->pool_id == CEPH_NOPOOL) |
| goto out; /* No parent? No problem. */ |
| |
| /* The ceph file layout needs to fit pool id in 32 bits */ |
| |
| ret = -EIO; |
| if (WARN_ON(parent_spec->pool_id > (u64) U32_MAX)) |
| goto out; |
| |
| image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| if (IS_ERR(image_id)) { |
| ret = PTR_ERR(image_id); |
| goto out_err; |
| } |
| parent_spec->image_id = image_id; |
| ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); |
| ceph_decode_64_safe(&p, end, overlap, out_err); |
| |
| rbd_dev->parent_overlap = overlap; |
| rbd_dev->parent_spec = parent_spec; |
| parent_spec = NULL; /* rbd_dev now owns this */ |
| out: |
| ret = 0; |
| out_err: |
| kfree(reply_buf); |
| rbd_spec_put(parent_spec); |
| |
| return ret; |
| } |
| |
| static char *rbd_dev_image_name(struct rbd_device *rbd_dev) |
| { |
| 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 = (char *) 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; |
| |
| ret = rbd_obj_method_sync(rbd_dev, RBD_DIRECTORY, |
| "rbd", "dir_get_name", |
| image_id, image_id_size, |
| (char *) reply_buf, size, NULL); |
| if (ret < 0) |
| goto out; |
| p = reply_buf; |
| end = (char *) reply_buf + size; |
| 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; |
| } |
| |
| /* |
| * When a parent image gets probed, we only have the pool, image, |
| * and snapshot ids but not the names of any of them. This call |
| * is made later to fill in those names. It has to be done after |
| * rbd_dev_snaps_update() has completed because some of the |
| * information (in particular, snapshot name) is not available |
| * until then. |
| */ |
| static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) |
| { |
| struct ceph_osd_client *osdc; |
| const char *name; |
| void *reply_buf = NULL; |
| int ret; |
| |
| if (rbd_dev->spec->pool_name) |
| return 0; /* Already have the names */ |
| |
| /* Look up the pool name */ |
| |
| osdc = &rbd_dev->rbd_client->client->osdc; |
| name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); |
| if (!name) { |
| rbd_warn(rbd_dev, "there is no pool with id %llu", |
| rbd_dev->spec->pool_id); /* Really a BUG() */ |
| return -EIO; |
| } |
| |
| rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); |
| if (!rbd_dev->spec->pool_name) |
| return -ENOMEM; |
| |
| /* Fetch the image name; tolerate failure here */ |
| |
| name = rbd_dev_image_name(rbd_dev); |
| if (name) |
| rbd_dev->spec->image_name = (char *) name; |
| else |
| rbd_warn(rbd_dev, "unable to get image name"); |
| |
| /* Look up the snapshot name. */ |
| |
| name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); |
| if (!name) { |
| rbd_warn(rbd_dev, "no snapshot with id %llu", |
| rbd_dev->spec->snap_id); /* Really a BUG() */ |
| ret = -EIO; |
| goto out_err; |
| } |
| rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); |
| if(!rbd_dev->spec->snap_name) |
| goto out_err; |
| |
| return 0; |
| out_err: |
| kfree(reply_buf); |
| kfree(rbd_dev->spec->pool_name); |
| rbd_dev->spec->pool_name = NULL; |
| |
| return ret; |
| } |
| |
| static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) |
| { |
| 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_name, |
| "rbd", "get_snapcontext", |
| NULL, 0, |
| reply_buf, size, ver); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| |
| ret = -ERANGE; |
| p = reply_buf; |
| end = (char *) reply_buf + size; |
| 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; |
| |
| size = sizeof (struct ceph_snap_context) + |
| snap_count * sizeof (snapc->snaps[0]); |
| snapc = kmalloc(size, GFP_KERNEL); |
| if (!snapc) { |
| ret = -ENOMEM; |
| goto out; |
| } |
| |
| atomic_set(&snapc->nref, 1); |
| snapc->seq = seq; |
| snapc->num_snaps = snap_count; |
| for (i = 0; i < snap_count; i++) |
| snapc->snaps[i] = ceph_decode_64(&p); |
| |
| 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 0; |
| } |
| |
| static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) |
| { |
| size_t size; |
| void *reply_buf; |
| __le64 snap_id; |
| 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); |
| |
| snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); |
| ret = rbd_obj_method_sync(rbd_dev, rbd_dev->header_name, |
| "rbd", "get_snapshot_name", |
| (char *) &snap_id, sizeof (snap_id), |
| reply_buf, size, NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| |
| p = reply_buf; |
| end = (char *) reply_buf + size; |
| snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); |
| if (IS_ERR(snap_name)) { |
| ret = PTR_ERR(snap_name); |
| goto out; |
| } else { |
| dout(" snap_id 0x%016llx snap_name = %s\n", |
| (unsigned long long) le64_to_cpu(snap_id), snap_name); |
| } |
| kfree(reply_buf); |
| |
| return snap_name; |
| out: |
| kfree(reply_buf); |
| |
| return ERR_PTR(ret); |
| } |
| |
| static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, |
| u64 *snap_size, u64 *snap_features) |
| { |
| u64 snap_id; |
| u8 order; |
| int ret; |
| |
| snap_id = rbd_dev->header.snapc->snaps[which]; |
| ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); |
| if (ret) |
| return ERR_PTR(ret); |
| ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| return rbd_dev_v2_snap_name(rbd_dev, which); |
| } |
| |
| static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, |
| u64 *snap_size, u64 *snap_features) |
| { |
| if (rbd_dev->image_format == 1) |
| return rbd_dev_v1_snap_info(rbd_dev, which, |
| snap_size, snap_features); |
| if (rbd_dev->image_format == 2) |
| return rbd_dev_v2_snap_info(rbd_dev, which, |
| snap_size, snap_features); |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) |
| { |
| int ret; |
| __u8 obj_order; |
| |
| down_write(&rbd_dev->header_rwsem); |
| |
| /* Grab old order first, to see if it changes */ |
| |
| obj_order = rbd_dev->header.obj_order, |
| ret = rbd_dev_v2_image_size(rbd_dev); |
| if (ret) |
| goto out; |
| if (rbd_dev->header.obj_order != obj_order) { |
| ret = -EIO; |
| goto out; |
| } |
| rbd_update_mapping_size(rbd_dev); |
| |
| ret = rbd_dev_v2_snap_context(rbd_dev, hver); |
| dout("rbd_dev_v2_snap_context returned %d\n", ret); |
| if (ret) |
| goto out; |
| ret = rbd_dev_snaps_update(rbd_dev); |
| dout("rbd_dev_snaps_update returned %d\n", ret); |
| if (ret) |
| goto out; |
| ret = rbd_dev_snaps_register(rbd_dev); |
| dout("rbd_dev_snaps_register returned %d\n", ret); |
| out: |
| up_write(&rbd_dev->header_rwsem); |
| |
| return ret; |
| } |
| |
| /* |
| * Scan the rbd device's current snapshot list and compare it to the |
| * newly-received snapshot context. Remove any existing snapshots |
| * not present in the new snapshot context. Add a new snapshot for |
| * any snaphots in the snapshot context not in the current list. |
| * And verify there are no changes to snapshots we already know |
| * about. |
| * |
| * Assumes the snapshots in the snapshot context are sorted by |
| * snapshot id, highest id first. (Snapshots in the rbd_dev's list |
| * are also maintained in that order.) |
| */ |
| static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) |
| { |
| struct ceph_snap_context *snapc = rbd_dev->header.snapc; |
| const u32 snap_count = snapc->num_snaps; |
| struct list_head *head = &rbd_dev->snaps; |
| struct list_head *links = head->next; |
| u32 index = 0; |
| |
| dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); |
| while (index < snap_count || links != head) { |
| u64 snap_id; |
| struct rbd_snap *snap; |
| char *snap_name; |
| u64 snap_size = 0; |
| u64 snap_features = 0; |
| |
| snap_id = index < snap_count ? snapc->snaps[index] |
| : CEPH_NOSNAP; |
| snap = links != head ? list_entry(links, struct rbd_snap, node) |
| : NULL; |
| rbd_assert(!snap || snap->id != CEPH_NOSNAP); |
| |
| if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { |
| struct list_head *next = links->next; |
| |
| /* |
| * A previously-existing snapshot is not in |
| * the new snap context. |
| * |
| * If the now missing snapshot is the one the |
| * image is mapped to, clear its exists flag |
| * so we can avoid sending any more requests |
| * to it. |
| */ |
| if (rbd_dev->spec->snap_id == snap->id) |
| clear_bit(RBD_DEV_FLAG_EXISTS, &rbd_dev->flags); |
| rbd_remove_snap_dev(snap); |
| dout("%ssnap id %llu has been removed\n", |
| rbd_dev->spec->snap_id == snap->id ? |
| "mapped " : "", |
| (unsigned long long) snap->id); |
| |
| /* Done with this list entry; advance */ |
| |
| links = next; |
| continue; |
| } |
| |
| snap_name = rbd_dev_snap_info(rbd_dev, index, |
| &snap_size, &snap_features); |
| if (IS_ERR(snap_name)) |
| return PTR_ERR(snap_name); |
| |
| dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, |
| (unsigned long long) snap_id); |
| if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { |
| struct rbd_snap *new_snap; |
| |
| /* We haven't seen this snapshot before */ |
| |
| new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, |
| snap_id, snap_size, snap_features); |
| if (IS_ERR(new_snap)) { |
| int err = PTR_ERR(new_snap); |
| |
| dout(" failed to add dev, error %d\n", err); |
| |
| return err; |
| } |
| |
| /* New goes before existing, or at end of list */ |
| |
| dout(" added dev%s\n", snap ? "" : " at end\n"); |
| if (snap) |
| list_add_tail(&new_snap->node, &snap->node); |
| else |
| list_add_tail(&new_snap->node, head); |
| } else { |
| /* Already have this one */ |
| |
| dout(" already present\n"); |
| |
| rbd_assert(snap->size == snap_size); |
| rbd_assert(!strcmp(snap->name, snap_name)); |
| rbd_assert(snap->features == snap_features); |
| |
| /* Done with this list entry; advance */ |
| |
| links = links->next; |
| } |
| |
| /* Advance to the next entry in the snapshot context */ |
| |
| index++; |
| } |
| dout("%s: done\n", __func__); |
| |
| return 0; |
| } |
| |
| /* |
| * Scan the list of snapshots and register the devices for any that |
| * have not already been registered. |
| */ |
| static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) |
| { |
| struct rbd_snap *snap; |
| int ret = 0; |
| |
| dout("%s called\n", __func__); |
| if (WARN_ON(!device_is_registered(&rbd_dev->dev))) |
| return -EIO; |
| |
| list_for_each_entry(snap, &rbd_dev->snaps, node) { |
| if (!rbd_snap_registered(snap)) { |
| ret = rbd_register_snap_dev(snap, &rbd_dev->dev); |
| if (ret < 0) |
| break; |
| } |
| } |
| dout("%s: returning %d\n", __func__, ret); |
| |
| return ret; |
| } |
| |
| static int rbd_bus_add_dev(struct rbd_device *rbd_dev) |
| { |
| struct device *dev; |
| int ret; |
| |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| |
| dev = &rbd_dev->dev; |
| dev->bus = &rbd_bus_type; |
| dev->type = &rbd_device_type; |
| dev->parent = &rbd_root_dev; |
| dev->release = rbd_dev_release; |
| dev_set_name(dev, "%d", rbd_dev->dev_id); |
| ret = device_register(dev); |
| |
| mutex_unlock(&ctl_mutex); |
| |
| return ret; |
| } |
| |
| static void rbd_bus_del_dev(struct rbd_device *rbd_dev) |
| { |
| device_unregister(&rbd_dev->dev); |
| } |
| |
| static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); |
| |
| /* |
| * Get a unique rbd identifier for the given new rbd_dev, and add |
| * the rbd_dev to the global list. The minimum rbd id is 1. |
| */ |
| static void rbd_dev_id_get(struct rbd_device *rbd_dev) |
| { |
| rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); |
| |
| spin_lock(&rbd_dev_list_lock); |
| list_add_tail(&rbd_dev->node, &rbd_dev_list); |
| spin_unlock(&rbd_dev_list_lock); |
| dout("rbd_dev %p given dev id %llu\n", rbd_dev, |
| (unsigned long long) rbd_dev->dev_id); |
| } |
| |
| /* |
| * Remove an rbd_dev from the global list, and record that its |
| * identifier is no longer in use. |
| */ |
| static void rbd_dev_id_put(struct rbd_device *rbd_dev) |
| { |
| struct list_head *tmp; |
| int rbd_id = rbd_dev->dev_id; |
| int max_id; |
| |
| rbd_assert(rbd_id > 0); |
| |
| dout("rbd_dev %p released dev id %llu\n", rbd_dev, |
| (unsigned long long) rbd_dev->dev_id); |
| spin_lock(&rbd_dev_list_lock); |
| list_del_init(&rbd_dev->node); |
| |
| /* |
| * If the id being "put" is not the current maximum, there |
| * is nothing special we need to do. |
| */ |
| if (rbd_id != atomic64_read(&rbd_dev_id_max)) { |
| spin_unlock(&rbd_dev_list_lock); |
| return; |
| } |
| |
| /* |
| * We need to update the current maximum id. Search the |
| * list to find out what it is. We're more likely to find |
| * the maximum at the end, so search the list backward. |
| */ |
| max_id = 0; |
| list_for_each_prev(tmp, &rbd_dev_list) { |
| struct rbd_device *rbd_dev; |
| |
| rbd_dev = list_entry(tmp, struct rbd_device, node); |
| if (rbd_dev->dev_id > max_id) |
| max_id = rbd_dev->dev_id; |
| } |
| spin_unlock(&rbd_dev_list_lock); |
| |
| /* |
| * The max id could have been updated by rbd_dev_id_get(), in |
| * which case it now accurately reflects the new maximum. |
| * Be careful not to overwrite the maximum value in that |
| * case. |
| */ |
| atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); |
| dout(" max dev id has been reset\n"); |
| } |
| |
| /* |
| * 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, and if the provided token buffer is |
| * big enough, copies the found token into it. The result, if |
| * copied, is guaranteed to be terminated with '\0'. Note that *buf |
| * must be terminated with '\0' on entry. |
| * |
| * Returns the length of the token found (not including the '\0'). |
| * Return value will be 0 if no token is found, and it will be >= |
| * token_size if the token would not fit. |
| * |
| * The *buf pointer will be updated to point beyond the end of the |
| * found token. Note that this occurs even if the token buffer is |
| * too small to hold it. |
| */ |
| static inline size_t copy_token(const char **buf, |
| char *token, |
| size_t token_size) |
| { |
| size_t len; |
| |
| len = next_token(buf); |
| if (len < token_size) { |
| memcpy(token, *buf, len); |
| *(token + len) = '\0'; |
| } |
| *buf += len; |
| |
| return len; |
| } |
| |
| /* |
| * 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; |
| 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; |
| } |
| spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); |
| if (!spec->snap_name) |
| goto out_mem; |
| *(spec->snap_name + len) = '\0'; |
| |
| /* 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; |
| |
| 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; |
| } |
| |
| /* |
| * 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; |
| char *object_name; |
| void *response; |
| void *p; |
| |
| /* |
| * 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. |
| */ |
| if (rbd_dev->spec->image_id) |
| return 0; |
| |
| /* |
| * First, see if the format 2 image id file exists, and if |
| * so, get the image's persistent id from it. |
| */ |
| size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); |
| object_name = kmalloc(size, GFP_NOIO); |
| if (!object_name) |
| return -ENOMEM; |
| sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); |
| dout("rbd id object name is %s\n", object_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; |
| } |
| |
| ret = rbd_obj_method_sync(rbd_dev, object_name, |
| "rbd", "get_id", |
| NULL, 0, |
| response, RBD_IMAGE_ID_LEN_MAX, NULL); |
| dout("%s: rbd_obj_method_sync returned %d\n", __func__, ret); |
| if (ret < 0) |
| goto out; |
| ret = 0; /* rbd_obj_method_sync() can return positive */ |
| |
| p = response; |
| rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, |
| p + RBD_IMAGE_ID_LEN_MAX, |
| NULL, GFP_NOIO); |
| if (IS_ERR(rbd_dev->spec->image_id)) { |
| ret = PTR_ERR(rbd_dev->spec->image_id); |
| rbd_dev->spec->image_id = NULL; |
| } else { |
| dout("image_id is %s\n", rbd_dev->spec->image_id); |
| } |
| out: |
| kfree(response); |
| kfree(object_name); |
| |
| return ret; |
| } |
| |
| static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| size_t size; |
| |
| /* Version 1 images have no id; empty string is used */ |
| |
| rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); |
| if (!rbd_dev->spec->image_id) |
| return -ENOMEM; |
| |
| /* Record the header object name for this rbd image. */ |
| |
| size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); |
| rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
| if (!rbd_dev->header_name) { |
| ret = -ENOMEM; |
| goto out_err; |
| } |
| sprintf(rbd_dev->header_name, "%s%s", |
| rbd_dev->spec->image_name, RBD_SUFFIX); |
| |
| /* Populate rbd image metadata */ |
| |
| ret = rbd_read_header(rbd_dev, &rbd_dev->header); |
| if (ret < 0) |
| goto out_err; |
| |
| /* Version 1 images have no parent (no layering) */ |
| |
| rbd_dev->parent_spec = NULL; |
| rbd_dev->parent_overlap = 0; |
| |
| rbd_dev->image_format = 1; |
| |
| dout("discovered version 1 image, header name is %s\n", |
| rbd_dev->header_name); |
| |
| return 0; |
| |
| out_err: |
| kfree(rbd_dev->header_name); |
| rbd_dev->header_name = NULL; |
| kfree(rbd_dev->spec->image_id); |
| rbd_dev->spec->image_id = NULL; |
| |
| return ret; |
| } |
| |
| static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) |
| { |
| size_t size; |
| int ret; |
| u64 ver = 0; |
| |
| /* |
| * Image id was filled in by the caller. Record the header |
| * object name for this rbd image. |
| */ |
| size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); |
| rbd_dev->header_name = kmalloc(size, GFP_KERNEL); |
| if (!rbd_dev->header_name) |
| return -ENOMEM; |
| sprintf(rbd_dev->header_name, "%s%s", |
| RBD_HEADER_PREFIX, rbd_dev->spec->image_id); |
| |
| /* Get the size and object order for the image */ |
| |
| ret = rbd_dev_v2_image_size(rbd_dev); |
| if (ret < 0) |
| goto out_err; |
| |
| /* Get the object prefix (a.k.a. block_name) for the image */ |
| |
| ret = rbd_dev_v2_object_prefix(rbd_dev); |
| if (ret < 0) |
| goto out_err; |
| |
| /* Get the and check features for the image */ |
| |
| ret = rbd_dev_v2_features(rbd_dev); |
| if (ret < 0) |
| goto out_err; |
| |
| /* If the image supports layering, get the parent info */ |
| |
| if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { |
| ret = rbd_dev_v2_parent_info(rbd_dev); |
| if (ret < 0) |
| goto out_err; |
| } |
| |
| /* crypto and compression type aren't (yet) supported for v2 images */ |
| |
| rbd_dev->header.crypt_type = 0; |
| rbd_dev->header.comp_type = 0; |
| |
| /* Get the snapshot context, plus the header version */ |
| |
| ret = rbd_dev_v2_snap_context(rbd_dev, &ver); |
| if (ret) |
| goto out_err; |
| rbd_dev->header.obj_version = ver; |
| |
| rbd_dev->image_format = 2; |
| |
| dout("discovered version 2 image, header name is %s\n", |
| rbd_dev->header_name); |
| |
| return 0; |
| out_err: |
| rbd_dev->parent_overlap = 0; |
| rbd_spec_put(rbd_dev->parent_spec); |
| rbd_dev->parent_spec = NULL; |
| kfree(rbd_dev->header_name); |
| rbd_dev->header_name = NULL; |
| kfree(rbd_dev->header.object_prefix); |
| rbd_dev->header.object_prefix = NULL; |
| |
| return ret; |
| } |
| |
| static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| /* no need to lock here, as rbd_dev is not registered yet */ |
| ret = rbd_dev_snaps_update(rbd_dev); |
| if (ret) |
| return ret; |
| |
| ret = rbd_dev_probe_update_spec(rbd_dev); |
| if (ret) |
| goto err_out_snaps; |
| |
| ret = rbd_dev_set_mapping(rbd_dev); |
| if (ret) |
| goto err_out_snaps; |
| |
| /* generate unique id: find highest unique id, add one */ |
| rbd_dev_id_get(rbd_dev); |
| |
| /* Fill in the device name, now that we have its id. */ |
| BUILD_BUG_ON(DEV_NAME_LEN |
| < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); |
| sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); |
| |
| /* Get our block major device number. */ |
| |
| ret = register_blkdev(0, rbd_dev->name); |
| if (ret < 0) |
| goto err_out_id; |
| rbd_dev->major = ret; |
| |
| /* Set up the blkdev mapping. */ |
| |
| ret = rbd_init_disk(rbd_dev); |
| if (ret) |
| goto err_out_blkdev; |
| |
| ret = rbd_bus_add_dev(rbd_dev); |
| if (ret) |
| goto err_out_disk; |
| |
| /* |
| * At this point cleanup in the event of an error is the job |
| * of the sysfs code (initiated by rbd_bus_del_dev()). |
| */ |
| down_write(&rbd_dev->header_rwsem); |
| ret = rbd_dev_snaps_register(rbd_dev); |
| up_write(&rbd_dev->header_rwsem); |
| if (ret) |
| goto err_out_bus; |
| |
| ret = rbd_dev_header_watch_sync(rbd_dev, 1); |
| if (ret) |
| goto err_out_bus; |
| |
| /* Everything's ready. Announce the disk to the world. */ |
| |
| add_disk(rbd_dev->disk); |
| |
| pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, |
| (unsigned long long) rbd_dev->mapping.size); |
| |
| return ret; |
| err_out_bus: |
| /* this will also clean up rest of rbd_dev stuff */ |
| |
| rbd_bus_del_dev(rbd_dev); |
| |
| return ret; |
| err_out_disk: |
| rbd_free_disk(rbd_dev); |
| err_out_blkdev: |
| unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| err_out_id: |
| rbd_dev_id_put(rbd_dev); |
| err_out_snaps: |
| rbd_remove_all_snaps(rbd_dev); |
| |
| return ret; |
| } |
| |
| /* |
| * Probe for the existence of the header object for the given rbd |
| * device. For format 2 images this includes determining the image |
| * id. |
| */ |
| static int rbd_dev_probe(struct rbd_device *rbd_dev) |
| { |
| int ret; |
| |
| /* |
| * Get the id from the image id object. If it's not a |
| * format 2 image, we'll get ENOENT back, and we'll assume |
| * it's a format 1 image. |
| */ |
| ret = rbd_dev_image_id(rbd_dev); |
| if (ret) |
| ret = rbd_dev_v1_probe(rbd_dev); |
| else |
| ret = rbd_dev_v2_probe(rbd_dev); |
| if (ret) { |
| dout("probe failed, returning %d\n", ret); |
| |
| return ret; |
| } |
| |
| ret = rbd_dev_probe_finish(rbd_dev); |
| if (ret) |
| rbd_header_free(&rbd_dev->header); |
| |
| return ret; |
| } |
| |
| static ssize_t 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; |
| struct ceph_osd_client *osdc; |
| int rc = -ENOMEM; |
| |
| 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 err_out_module; |
| |
| rbdc = rbd_get_client(ceph_opts); |
| if (IS_ERR(rbdc)) { |
| rc = PTR_ERR(rbdc); |
| goto err_out_args; |
| } |
| ceph_opts = NULL; /* rbd_dev client now owns this */ |
| |
| /* pick the pool */ |
| osdc = &rbdc->client->osdc; |
| rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); |
| if (rc < 0) |
| goto err_out_client; |
| spec->pool_id = (u64) rc; |
| |
| /* The ceph file layout needs to fit pool id in 32 bits */ |
| |
| if (WARN_ON(spec->pool_id > (u64) U32_MAX)) { |
| rc = -EIO; |
| goto err_out_client; |
| } |
| |
| rbd_dev = rbd_dev_create(rbdc, spec); |
| if (!rbd_dev) |
| goto err_out_client; |
| rbdc = NULL; /* rbd_dev now owns this */ |
| spec = NULL; /* rbd_dev now owns this */ |
| |
| rbd_dev->mapping.read_only = rbd_opts->read_only; |
| kfree(rbd_opts); |
| rbd_opts = NULL; /* done with this */ |
| |
| rc = rbd_dev_probe(rbd_dev); |
| if (rc < 0) |
| goto err_out_rbd_dev; |
| |
| return count; |
| err_out_rbd_dev: |
| rbd_dev_destroy(rbd_dev); |
| err_out_client: |
| rbd_put_client(rbdc); |
| err_out_args: |
| if (ceph_opts) |
| ceph_destroy_options(ceph_opts); |
| kfree(rbd_opts); |
| rbd_spec_put(spec); |
| err_out_module: |
| module_put(THIS_MODULE); |
| |
| dout("Error adding device %s\n", buf); |
| |
| return (ssize_t) rc; |
| } |
| |
| static struct rbd_device *__rbd_get_dev(unsigned long dev_id) |
| { |
| struct list_head *tmp; |
| struct rbd_device *rbd_dev; |
| |
| 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) { |
| spin_unlock(&rbd_dev_list_lock); |
| return rbd_dev; |
| } |
| } |
| spin_unlock(&rbd_dev_list_lock); |
| return NULL; |
| } |
| |
| static void rbd_dev_release(struct device *dev) |
| { |
| struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); |
| |
| if (rbd_dev->watch_event) |
| rbd_dev_header_watch_sync(rbd_dev, 0); |
| |
| /* clean up and free blkdev */ |
| rbd_free_disk(rbd_dev); |
| unregister_blkdev(rbd_dev->major, rbd_dev->name); |
| |
| /* release allocated disk header fields */ |
| rbd_header_free(&rbd_dev->header); |
| |
| /* done with the id, and with the rbd_dev */ |
| rbd_dev_id_put(rbd_dev); |
| rbd_assert(rbd_dev->rbd_client != NULL); |
| rbd_dev_destroy(rbd_dev); |
| |
| /* release module ref */ |
| module_put(THIS_MODULE); |
| } |
| |
| static ssize_t rbd_remove(struct bus_type *bus, |
| const char *buf, |
| size_t count) |
| { |
| struct rbd_device *rbd_dev = NULL; |
| int target_id, rc; |
| unsigned long ul; |
| int ret = count; |
| |
| rc = strict_strtoul(buf, 10, &ul); |
| if (rc) |
| return rc; |
| |
| /* convert to int; abort if we lost anything in the conversion */ |
| target_id = (int) ul; |
| if (target_id != ul) |
| return -EINVAL; |
| |
| mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); |
| |
| rbd_dev = __rbd_get_dev(target_id); |
| if (!rbd_dev) { |
| ret = -ENOENT; |
| goto done; |
| } |
| |
| spin_lock_irq(&rbd_dev->lock); |
| if (rbd_dev->open_count) |
| ret = -EBUSY; |
| else |
| set_bit(RBD_DEV_FLAG_REMOVING, &rbd_dev->flags); |
| spin_unlock_irq(&rbd_dev->lock); |
| if (ret < 0) |
| goto done; |
| |
| rbd_remove_all_snaps(rbd_dev); |
| rbd_bus_del_dev(rbd_dev); |
| |
| done: |
| mutex_unlock(&ctl_mutex); |
| |
| return ret; |
| } |
| |
| /* |
| * 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); |
| } |
| |
| int __init rbd_init(void) |
| { |
| int rc; |
| |
| if (!libceph_compatible(NULL)) { |
| rbd_warn(NULL, "libceph incompatibility (quitting)"); |
| |
| return -EINVAL; |
| } |
| rc = rbd_sysfs_init(); |
| if (rc) |
| return rc; |
| pr_info("loaded " RBD_DRV_NAME_LONG "\n"); |
| return 0; |
| } |
| |
| void __exit rbd_exit(void) |
| { |
| rbd_sysfs_cleanup(); |
| } |
| |
| module_init(rbd_init); |
| module_exit(rbd_exit); |
| |
| MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); |
| MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); |
| MODULE_DESCRIPTION("rados block device"); |
| |
| /* following authorship retained from original osdblk.c */ |
| MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); |
| |
| MODULE_LICENSE("GPL"); |