1602adf40SYehuda Sadeh /* 2602adf40SYehuda Sadeh rbd.c -- Export ceph rados objects as a Linux block device 3602adf40SYehuda Sadeh 4602adf40SYehuda Sadeh 5602adf40SYehuda Sadeh based on drivers/block/osdblk.c: 6602adf40SYehuda Sadeh 7602adf40SYehuda Sadeh Copyright 2009 Red Hat, Inc. 8602adf40SYehuda Sadeh 9602adf40SYehuda Sadeh This program is free software; you can redistribute it and/or modify 10602adf40SYehuda Sadeh it under the terms of the GNU General Public License as published by 11602adf40SYehuda Sadeh the Free Software Foundation. 12602adf40SYehuda Sadeh 13602adf40SYehuda Sadeh This program is distributed in the hope that it will be useful, 14602adf40SYehuda Sadeh but WITHOUT ANY WARRANTY; without even the implied warranty of 15602adf40SYehuda Sadeh MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16602adf40SYehuda Sadeh GNU General Public License for more details. 17602adf40SYehuda Sadeh 18602adf40SYehuda Sadeh You should have received a copy of the GNU General Public License 19602adf40SYehuda Sadeh along with this program; see the file COPYING. If not, write to 20602adf40SYehuda Sadeh the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 21602adf40SYehuda Sadeh 22602adf40SYehuda Sadeh 23602adf40SYehuda Sadeh 24dfc5606dSYehuda Sadeh For usage instructions, please refer to: 25602adf40SYehuda Sadeh 26dfc5606dSYehuda Sadeh Documentation/ABI/testing/sysfs-bus-rbd 27602adf40SYehuda Sadeh 28602adf40SYehuda Sadeh */ 29602adf40SYehuda Sadeh 30602adf40SYehuda Sadeh #include <linux/ceph/libceph.h> 31602adf40SYehuda Sadeh #include <linux/ceph/osd_client.h> 32602adf40SYehuda Sadeh #include <linux/ceph/mon_client.h> 33602adf40SYehuda Sadeh #include <linux/ceph/decode.h> 3459c2be1eSYehuda Sadeh #include <linux/parser.h> 35602adf40SYehuda Sadeh 36602adf40SYehuda Sadeh #include <linux/kernel.h> 37602adf40SYehuda Sadeh #include <linux/device.h> 38602adf40SYehuda Sadeh #include <linux/module.h> 39602adf40SYehuda Sadeh #include <linux/fs.h> 40602adf40SYehuda Sadeh #include <linux/blkdev.h> 41602adf40SYehuda Sadeh 42602adf40SYehuda Sadeh #include "rbd_types.h" 43602adf40SYehuda Sadeh 44aafb230eSAlex Elder #define RBD_DEBUG /* Activate rbd_assert() calls */ 45aafb230eSAlex Elder 46593a9e7bSAlex Elder /* 47593a9e7bSAlex Elder * The basic unit of block I/O is a sector. It is interpreted in a 48593a9e7bSAlex Elder * number of contexts in Linux (blk, bio, genhd), but the default is 49593a9e7bSAlex Elder * universally 512 bytes. These symbols are just slightly more 50593a9e7bSAlex Elder * meaningful than the bare numbers they represent. 51593a9e7bSAlex Elder */ 52593a9e7bSAlex Elder #define SECTOR_SHIFT 9 53593a9e7bSAlex Elder #define SECTOR_SIZE (1ULL << SECTOR_SHIFT) 54593a9e7bSAlex Elder 55df111be6SAlex Elder /* It might be useful to have this defined elsewhere too */ 56df111be6SAlex Elder 570ec8ce87SAlex Elder #define U32_MAX ((u32) (~0U)) 58df111be6SAlex Elder #define U64_MAX ((u64) (~0ULL)) 59df111be6SAlex Elder 60f0f8cef5SAlex Elder #define RBD_DRV_NAME "rbd" 61f0f8cef5SAlex Elder #define RBD_DRV_NAME_LONG "rbd (rados block device)" 62602adf40SYehuda Sadeh 63602adf40SYehuda Sadeh #define RBD_MINORS_PER_MAJOR 256 /* max minors per blkdev */ 64602adf40SYehuda Sadeh 65d4b125e9SAlex Elder #define RBD_SNAP_DEV_NAME_PREFIX "snap_" 66d4b125e9SAlex Elder #define RBD_MAX_SNAP_NAME_LEN \ 67d4b125e9SAlex Elder (NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1)) 68d4b125e9SAlex Elder 6935d489f9SAlex Elder #define RBD_MAX_SNAP_COUNT 510 /* allows max snapc to fit in 4KB */ 70602adf40SYehuda Sadeh #define RBD_MAX_OPT_LEN 1024 71602adf40SYehuda Sadeh 72602adf40SYehuda Sadeh #define RBD_SNAP_HEAD_NAME "-" 73602adf40SYehuda Sadeh 749e15b77dSAlex Elder /* This allows a single page to hold an image name sent by OSD */ 759e15b77dSAlex Elder #define RBD_IMAGE_NAME_LEN_MAX (PAGE_SIZE - sizeof (__le32) - 1) 76589d30e0SAlex Elder #define RBD_IMAGE_ID_LEN_MAX 64 779e15b77dSAlex Elder 781e130199SAlex Elder #define RBD_OBJ_PREFIX_LEN_MAX 64 79589d30e0SAlex Elder 80d889140cSAlex Elder /* Feature bits */ 81d889140cSAlex Elder 82d889140cSAlex Elder #define RBD_FEATURE_LAYERING 1 83d889140cSAlex Elder 84d889140cSAlex Elder /* Features supported by this (client software) implementation. */ 85d889140cSAlex Elder 86d889140cSAlex Elder #define RBD_FEATURES_ALL (0) 87d889140cSAlex Elder 8881a89793SAlex Elder /* 8981a89793SAlex Elder * An RBD device name will be "rbd#", where the "rbd" comes from 9081a89793SAlex Elder * RBD_DRV_NAME above, and # is a unique integer identifier. 9181a89793SAlex Elder * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big 9281a89793SAlex Elder * enough to hold all possible device names. 9381a89793SAlex Elder */ 94602adf40SYehuda Sadeh #define DEV_NAME_LEN 32 9581a89793SAlex Elder #define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1) 96602adf40SYehuda Sadeh 97cc0538b6SAlex Elder #define RBD_READ_ONLY_DEFAULT false 9859c2be1eSYehuda Sadeh 99602adf40SYehuda Sadeh /* 100602adf40SYehuda Sadeh * block device image metadata (in-memory version) 101602adf40SYehuda Sadeh */ 102602adf40SYehuda Sadeh struct rbd_image_header { 103f84344f3SAlex Elder /* These four fields never change for a given rbd image */ 104849b4260SAlex Elder char *object_prefix; 10534b13184SAlex Elder u64 features; 106602adf40SYehuda Sadeh __u8 obj_order; 107602adf40SYehuda Sadeh __u8 crypt_type; 108602adf40SYehuda Sadeh __u8 comp_type; 109602adf40SYehuda Sadeh 110f84344f3SAlex Elder /* The remaining fields need to be updated occasionally */ 111f84344f3SAlex Elder u64 image_size; 112f84344f3SAlex Elder struct ceph_snap_context *snapc; 113602adf40SYehuda Sadeh char *snap_names; 114602adf40SYehuda Sadeh u64 *snap_sizes; 11559c2be1eSYehuda Sadeh 11659c2be1eSYehuda Sadeh u64 obj_version; 11759c2be1eSYehuda Sadeh }; 11859c2be1eSYehuda Sadeh 1190d7dbfceSAlex Elder /* 1200d7dbfceSAlex Elder * An rbd image specification. 1210d7dbfceSAlex Elder * 1220d7dbfceSAlex Elder * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely 123c66c6e0cSAlex Elder * identify an image. Each rbd_dev structure includes a pointer to 124c66c6e0cSAlex Elder * an rbd_spec structure that encapsulates this identity. 125c66c6e0cSAlex Elder * 126c66c6e0cSAlex Elder * Each of the id's in an rbd_spec has an associated name. For a 127c66c6e0cSAlex Elder * user-mapped image, the names are supplied and the id's associated 128c66c6e0cSAlex Elder * with them are looked up. For a layered image, a parent image is 129c66c6e0cSAlex Elder * defined by the tuple, and the names are looked up. 130c66c6e0cSAlex Elder * 131c66c6e0cSAlex Elder * An rbd_dev structure contains a parent_spec pointer which is 132c66c6e0cSAlex Elder * non-null if the image it represents is a child in a layered 133c66c6e0cSAlex Elder * image. This pointer will refer to the rbd_spec structure used 134c66c6e0cSAlex Elder * by the parent rbd_dev for its own identity (i.e., the structure 135c66c6e0cSAlex Elder * is shared between the parent and child). 136c66c6e0cSAlex Elder * 137c66c6e0cSAlex Elder * Since these structures are populated once, during the discovery 138c66c6e0cSAlex Elder * phase of image construction, they are effectively immutable so 139c66c6e0cSAlex Elder * we make no effort to synchronize access to them. 140c66c6e0cSAlex Elder * 141c66c6e0cSAlex Elder * Note that code herein does not assume the image name is known (it 142c66c6e0cSAlex Elder * could be a null pointer). 1430d7dbfceSAlex Elder */ 1440d7dbfceSAlex Elder struct rbd_spec { 1450d7dbfceSAlex Elder u64 pool_id; 1460d7dbfceSAlex Elder char *pool_name; 1470d7dbfceSAlex Elder 1480d7dbfceSAlex Elder char *image_id; 1490d7dbfceSAlex Elder char *image_name; 1500d7dbfceSAlex Elder 1510d7dbfceSAlex Elder u64 snap_id; 1520d7dbfceSAlex Elder char *snap_name; 1530d7dbfceSAlex Elder 1540d7dbfceSAlex Elder struct kref kref; 1550d7dbfceSAlex Elder }; 1560d7dbfceSAlex Elder 15759c2be1eSYehuda Sadeh struct rbd_options { 158cc0538b6SAlex Elder bool read_only; 159602adf40SYehuda Sadeh }; 160602adf40SYehuda Sadeh 161602adf40SYehuda Sadeh /* 162f0f8cef5SAlex Elder * an instance of the client. multiple devices may share an rbd client. 163602adf40SYehuda Sadeh */ 164602adf40SYehuda Sadeh struct rbd_client { 165602adf40SYehuda Sadeh struct ceph_client *client; 166602adf40SYehuda Sadeh struct kref kref; 167602adf40SYehuda Sadeh struct list_head node; 168602adf40SYehuda Sadeh }; 169602adf40SYehuda Sadeh 170602adf40SYehuda Sadeh /* 171f0f8cef5SAlex Elder * a request completion status 172602adf40SYehuda Sadeh */ 1731fec7093SYehuda Sadeh struct rbd_req_status { 1741fec7093SYehuda Sadeh int done; 1758986cb37SAlex Elder s32 rc; 1761fec7093SYehuda Sadeh u64 bytes; 1771fec7093SYehuda Sadeh }; 1781fec7093SYehuda Sadeh 1791fec7093SYehuda Sadeh /* 1801fec7093SYehuda Sadeh * a collection of requests 1811fec7093SYehuda Sadeh */ 1821fec7093SYehuda Sadeh struct rbd_req_coll { 1831fec7093SYehuda Sadeh int total; 1841fec7093SYehuda Sadeh int num_done; 1851fec7093SYehuda Sadeh struct kref kref; 1861fec7093SYehuda Sadeh struct rbd_req_status status[0]; 187602adf40SYehuda Sadeh }; 188602adf40SYehuda Sadeh 189f0f8cef5SAlex Elder /* 190f0f8cef5SAlex Elder * a single io request 191f0f8cef5SAlex Elder */ 192f0f8cef5SAlex Elder struct rbd_request { 193f0f8cef5SAlex Elder struct request *rq; /* blk layer request */ 194f0f8cef5SAlex Elder struct bio *bio; /* cloned bio */ 195f0f8cef5SAlex Elder struct page **pages; /* list of used pages */ 196f0f8cef5SAlex Elder u64 len; 197f0f8cef5SAlex Elder int coll_index; 198f0f8cef5SAlex Elder struct rbd_req_coll *coll; 199f0f8cef5SAlex Elder }; 200f0f8cef5SAlex Elder 201dfc5606dSYehuda Sadeh struct rbd_snap { 202dfc5606dSYehuda Sadeh struct device dev; 203dfc5606dSYehuda Sadeh const char *name; 2043591538fSJosh Durgin u64 size; 205dfc5606dSYehuda Sadeh struct list_head node; 206dfc5606dSYehuda Sadeh u64 id; 20734b13184SAlex Elder u64 features; 208dfc5606dSYehuda Sadeh }; 209dfc5606dSYehuda Sadeh 210f84344f3SAlex Elder struct rbd_mapping { 21199c1f08fSAlex Elder u64 size; 21234b13184SAlex Elder u64 features; 213f84344f3SAlex Elder bool read_only; 214f84344f3SAlex Elder }; 215f84344f3SAlex Elder 216602adf40SYehuda Sadeh /* 217602adf40SYehuda Sadeh * a single device 218602adf40SYehuda Sadeh */ 219602adf40SYehuda Sadeh struct rbd_device { 220de71a297SAlex Elder int dev_id; /* blkdev unique id */ 221602adf40SYehuda Sadeh 222602adf40SYehuda Sadeh int major; /* blkdev assigned major */ 223602adf40SYehuda Sadeh struct gendisk *disk; /* blkdev's gendisk and rq */ 224602adf40SYehuda Sadeh 225a30b71b9SAlex Elder u32 image_format; /* Either 1 or 2 */ 226602adf40SYehuda Sadeh struct rbd_client *rbd_client; 227602adf40SYehuda Sadeh 228602adf40SYehuda Sadeh char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */ 229602adf40SYehuda Sadeh 230602adf40SYehuda Sadeh spinlock_t lock; /* queue lock */ 231602adf40SYehuda Sadeh 232602adf40SYehuda Sadeh struct rbd_image_header header; 233d78b650aSAlex Elder atomic_t exists; 2340d7dbfceSAlex Elder struct rbd_spec *spec; 235602adf40SYehuda Sadeh 2360d7dbfceSAlex Elder char *header_name; 237971f839aSAlex Elder 23859c2be1eSYehuda Sadeh struct ceph_osd_event *watch_event; 23959c2be1eSYehuda Sadeh struct ceph_osd_request *watch_request; 24059c2be1eSYehuda Sadeh 24186b00e0dSAlex Elder struct rbd_spec *parent_spec; 24286b00e0dSAlex Elder u64 parent_overlap; 24386b00e0dSAlex Elder 244c666601aSJosh Durgin /* protects updating the header */ 245c666601aSJosh Durgin struct rw_semaphore header_rwsem; 246f84344f3SAlex Elder 247f84344f3SAlex Elder struct rbd_mapping mapping; 248602adf40SYehuda Sadeh 249602adf40SYehuda Sadeh struct list_head node; 250dfc5606dSYehuda Sadeh 251dfc5606dSYehuda Sadeh /* list of snapshots */ 252dfc5606dSYehuda Sadeh struct list_head snaps; 253dfc5606dSYehuda Sadeh 254dfc5606dSYehuda Sadeh /* sysfs related */ 255dfc5606dSYehuda Sadeh struct device dev; 25642382b70SAlex Elder unsigned long open_count; 257dfc5606dSYehuda Sadeh }; 258dfc5606dSYehuda Sadeh 259602adf40SYehuda Sadeh static DEFINE_MUTEX(ctl_mutex); /* Serialize open/close/setup/teardown */ 260e124a82fSAlex Elder 261602adf40SYehuda Sadeh static LIST_HEAD(rbd_dev_list); /* devices */ 262e124a82fSAlex Elder static DEFINE_SPINLOCK(rbd_dev_list_lock); 263e124a82fSAlex Elder 264602adf40SYehuda Sadeh static LIST_HEAD(rbd_client_list); /* clients */ 265432b8587SAlex Elder static DEFINE_SPINLOCK(rbd_client_list_lock); 266602adf40SYehuda Sadeh 267304f6808SAlex Elder static int rbd_dev_snaps_update(struct rbd_device *rbd_dev); 268304f6808SAlex Elder static int rbd_dev_snaps_register(struct rbd_device *rbd_dev); 269304f6808SAlex Elder 270dfc5606dSYehuda Sadeh static void rbd_dev_release(struct device *dev); 27141f38c2bSAlex Elder static void rbd_remove_snap_dev(struct rbd_snap *snap); 272dfc5606dSYehuda Sadeh 273f0f8cef5SAlex Elder static ssize_t rbd_add(struct bus_type *bus, const char *buf, 274f0f8cef5SAlex Elder size_t count); 275f0f8cef5SAlex Elder static ssize_t rbd_remove(struct bus_type *bus, const char *buf, 276f0f8cef5SAlex Elder size_t count); 277f0f8cef5SAlex Elder 278f0f8cef5SAlex Elder static struct bus_attribute rbd_bus_attrs[] = { 279f0f8cef5SAlex Elder __ATTR(add, S_IWUSR, NULL, rbd_add), 280f0f8cef5SAlex Elder __ATTR(remove, S_IWUSR, NULL, rbd_remove), 281f0f8cef5SAlex Elder __ATTR_NULL 282f0f8cef5SAlex Elder }; 283f0f8cef5SAlex Elder 284f0f8cef5SAlex Elder static struct bus_type rbd_bus_type = { 285f0f8cef5SAlex Elder .name = "rbd", 286f0f8cef5SAlex Elder .bus_attrs = rbd_bus_attrs, 287f0f8cef5SAlex Elder }; 288f0f8cef5SAlex Elder 289f0f8cef5SAlex Elder static void rbd_root_dev_release(struct device *dev) 290f0f8cef5SAlex Elder { 291f0f8cef5SAlex Elder } 292f0f8cef5SAlex Elder 293f0f8cef5SAlex Elder static struct device rbd_root_dev = { 294f0f8cef5SAlex Elder .init_name = "rbd", 295f0f8cef5SAlex Elder .release = rbd_root_dev_release, 296f0f8cef5SAlex Elder }; 297f0f8cef5SAlex Elder 29806ecc6cbSAlex Elder static __printf(2, 3) 29906ecc6cbSAlex Elder void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) 30006ecc6cbSAlex Elder { 30106ecc6cbSAlex Elder struct va_format vaf; 30206ecc6cbSAlex Elder va_list args; 30306ecc6cbSAlex Elder 30406ecc6cbSAlex Elder va_start(args, fmt); 30506ecc6cbSAlex Elder vaf.fmt = fmt; 30606ecc6cbSAlex Elder vaf.va = &args; 30706ecc6cbSAlex Elder 30806ecc6cbSAlex Elder if (!rbd_dev) 30906ecc6cbSAlex Elder printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf); 31006ecc6cbSAlex Elder else if (rbd_dev->disk) 31106ecc6cbSAlex Elder printk(KERN_WARNING "%s: %s: %pV\n", 31206ecc6cbSAlex Elder RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf); 31306ecc6cbSAlex Elder else if (rbd_dev->spec && rbd_dev->spec->image_name) 31406ecc6cbSAlex Elder printk(KERN_WARNING "%s: image %s: %pV\n", 31506ecc6cbSAlex Elder RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf); 31606ecc6cbSAlex Elder else if (rbd_dev->spec && rbd_dev->spec->image_id) 31706ecc6cbSAlex Elder printk(KERN_WARNING "%s: id %s: %pV\n", 31806ecc6cbSAlex Elder RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf); 31906ecc6cbSAlex Elder else /* punt */ 32006ecc6cbSAlex Elder printk(KERN_WARNING "%s: rbd_dev %p: %pV\n", 32106ecc6cbSAlex Elder RBD_DRV_NAME, rbd_dev, &vaf); 32206ecc6cbSAlex Elder va_end(args); 32306ecc6cbSAlex Elder } 32406ecc6cbSAlex Elder 325aafb230eSAlex Elder #ifdef RBD_DEBUG 326aafb230eSAlex Elder #define rbd_assert(expr) \ 327aafb230eSAlex Elder if (unlikely(!(expr))) { \ 328aafb230eSAlex Elder printk(KERN_ERR "\nAssertion failure in %s() " \ 329aafb230eSAlex Elder "at line %d:\n\n" \ 330aafb230eSAlex Elder "\trbd_assert(%s);\n\n", \ 331aafb230eSAlex Elder __func__, __LINE__, #expr); \ 332aafb230eSAlex Elder BUG(); \ 333aafb230eSAlex Elder } 334aafb230eSAlex Elder #else /* !RBD_DEBUG */ 335aafb230eSAlex Elder # define rbd_assert(expr) ((void) 0) 336aafb230eSAlex Elder #endif /* !RBD_DEBUG */ 337dfc5606dSYehuda Sadeh 338117973fbSAlex Elder static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver); 339117973fbSAlex Elder static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver); 34059c2be1eSYehuda Sadeh 341602adf40SYehuda Sadeh static int rbd_open(struct block_device *bdev, fmode_t mode) 342602adf40SYehuda Sadeh { 343f0f8cef5SAlex Elder struct rbd_device *rbd_dev = bdev->bd_disk->private_data; 344602adf40SYehuda Sadeh 345f84344f3SAlex Elder if ((mode & FMODE_WRITE) && rbd_dev->mapping.read_only) 346602adf40SYehuda Sadeh return -EROFS; 347602adf40SYehuda Sadeh 34842382b70SAlex Elder mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 349c3e946ceSAlex Elder (void) get_device(&rbd_dev->dev); 350f84344f3SAlex Elder set_device_ro(bdev, rbd_dev->mapping.read_only); 35142382b70SAlex Elder rbd_dev->open_count++; 35242382b70SAlex Elder mutex_unlock(&ctl_mutex); 353340c7a2bSAlex Elder 354602adf40SYehuda Sadeh return 0; 355602adf40SYehuda Sadeh } 356602adf40SYehuda Sadeh 357dfc5606dSYehuda Sadeh static int rbd_release(struct gendisk *disk, fmode_t mode) 358dfc5606dSYehuda Sadeh { 359dfc5606dSYehuda Sadeh struct rbd_device *rbd_dev = disk->private_data; 360dfc5606dSYehuda Sadeh 36142382b70SAlex Elder mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 36242382b70SAlex Elder rbd_assert(rbd_dev->open_count > 0); 36342382b70SAlex Elder rbd_dev->open_count--; 364c3e946ceSAlex Elder put_device(&rbd_dev->dev); 36542382b70SAlex Elder mutex_unlock(&ctl_mutex); 366dfc5606dSYehuda Sadeh 367dfc5606dSYehuda Sadeh return 0; 368dfc5606dSYehuda Sadeh } 369dfc5606dSYehuda Sadeh 370602adf40SYehuda Sadeh static const struct block_device_operations rbd_bd_ops = { 371602adf40SYehuda Sadeh .owner = THIS_MODULE, 372602adf40SYehuda Sadeh .open = rbd_open, 373dfc5606dSYehuda Sadeh .release = rbd_release, 374602adf40SYehuda Sadeh }; 375602adf40SYehuda Sadeh 376602adf40SYehuda Sadeh /* 377602adf40SYehuda Sadeh * Initialize an rbd client instance. 37843ae4701SAlex Elder * We own *ceph_opts. 379602adf40SYehuda Sadeh */ 380f8c38929SAlex Elder static struct rbd_client *rbd_client_create(struct ceph_options *ceph_opts) 381602adf40SYehuda Sadeh { 382602adf40SYehuda Sadeh struct rbd_client *rbdc; 383602adf40SYehuda Sadeh int ret = -ENOMEM; 384602adf40SYehuda Sadeh 385602adf40SYehuda Sadeh dout("rbd_client_create\n"); 386602adf40SYehuda Sadeh rbdc = kmalloc(sizeof(struct rbd_client), GFP_KERNEL); 387602adf40SYehuda Sadeh if (!rbdc) 388602adf40SYehuda Sadeh goto out_opt; 389602adf40SYehuda Sadeh 390602adf40SYehuda Sadeh kref_init(&rbdc->kref); 391602adf40SYehuda Sadeh INIT_LIST_HEAD(&rbdc->node); 392602adf40SYehuda Sadeh 393bc534d86SAlex Elder mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 394bc534d86SAlex Elder 39543ae4701SAlex Elder rbdc->client = ceph_create_client(ceph_opts, rbdc, 0, 0); 396602adf40SYehuda Sadeh if (IS_ERR(rbdc->client)) 397bc534d86SAlex Elder goto out_mutex; 39843ae4701SAlex Elder ceph_opts = NULL; /* Now rbdc->client is responsible for ceph_opts */ 399602adf40SYehuda Sadeh 400602adf40SYehuda Sadeh ret = ceph_open_session(rbdc->client); 401602adf40SYehuda Sadeh if (ret < 0) 402602adf40SYehuda Sadeh goto out_err; 403602adf40SYehuda Sadeh 404432b8587SAlex Elder spin_lock(&rbd_client_list_lock); 405602adf40SYehuda Sadeh list_add_tail(&rbdc->node, &rbd_client_list); 406432b8587SAlex Elder spin_unlock(&rbd_client_list_lock); 407602adf40SYehuda Sadeh 408bc534d86SAlex Elder mutex_unlock(&ctl_mutex); 409bc534d86SAlex Elder 410602adf40SYehuda Sadeh dout("rbd_client_create created %p\n", rbdc); 411602adf40SYehuda Sadeh return rbdc; 412602adf40SYehuda Sadeh 413602adf40SYehuda Sadeh out_err: 414602adf40SYehuda Sadeh ceph_destroy_client(rbdc->client); 415bc534d86SAlex Elder out_mutex: 416bc534d86SAlex Elder mutex_unlock(&ctl_mutex); 417602adf40SYehuda Sadeh kfree(rbdc); 418602adf40SYehuda Sadeh out_opt: 41943ae4701SAlex Elder if (ceph_opts) 42043ae4701SAlex Elder ceph_destroy_options(ceph_opts); 42128f259b7SVasiliy Kulikov return ERR_PTR(ret); 422602adf40SYehuda Sadeh } 423602adf40SYehuda Sadeh 424602adf40SYehuda Sadeh /* 4251f7ba331SAlex Elder * Find a ceph client with specific addr and configuration. If 4261f7ba331SAlex Elder * found, bump its reference count. 427602adf40SYehuda Sadeh */ 4281f7ba331SAlex Elder static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts) 429602adf40SYehuda Sadeh { 430602adf40SYehuda Sadeh struct rbd_client *client_node; 4311f7ba331SAlex Elder bool found = false; 432602adf40SYehuda Sadeh 43343ae4701SAlex Elder if (ceph_opts->flags & CEPH_OPT_NOSHARE) 434602adf40SYehuda Sadeh return NULL; 435602adf40SYehuda Sadeh 4361f7ba331SAlex Elder spin_lock(&rbd_client_list_lock); 4371f7ba331SAlex Elder list_for_each_entry(client_node, &rbd_client_list, node) { 4381f7ba331SAlex Elder if (!ceph_compare_options(ceph_opts, client_node->client)) { 4391f7ba331SAlex Elder kref_get(&client_node->kref); 4401f7ba331SAlex Elder found = true; 4411f7ba331SAlex Elder break; 4421f7ba331SAlex Elder } 4431f7ba331SAlex Elder } 4441f7ba331SAlex Elder spin_unlock(&rbd_client_list_lock); 4451f7ba331SAlex Elder 4461f7ba331SAlex Elder return found ? client_node : NULL; 447602adf40SYehuda Sadeh } 448602adf40SYehuda Sadeh 449602adf40SYehuda Sadeh /* 45059c2be1eSYehuda Sadeh * mount options 45159c2be1eSYehuda Sadeh */ 45259c2be1eSYehuda Sadeh enum { 45359c2be1eSYehuda Sadeh Opt_last_int, 45459c2be1eSYehuda Sadeh /* int args above */ 45559c2be1eSYehuda Sadeh Opt_last_string, 45659c2be1eSYehuda Sadeh /* string args above */ 457cc0538b6SAlex Elder Opt_read_only, 458cc0538b6SAlex Elder Opt_read_write, 459cc0538b6SAlex Elder /* Boolean args above */ 460cc0538b6SAlex Elder Opt_last_bool, 46159c2be1eSYehuda Sadeh }; 46259c2be1eSYehuda Sadeh 46343ae4701SAlex Elder static match_table_t rbd_opts_tokens = { 46459c2be1eSYehuda Sadeh /* int args above */ 46559c2be1eSYehuda Sadeh /* string args above */ 466be466c1cSAlex Elder {Opt_read_only, "read_only"}, 467cc0538b6SAlex Elder {Opt_read_only, "ro"}, /* Alternate spelling */ 468cc0538b6SAlex Elder {Opt_read_write, "read_write"}, 469cc0538b6SAlex Elder {Opt_read_write, "rw"}, /* Alternate spelling */ 470cc0538b6SAlex Elder /* Boolean args above */ 47159c2be1eSYehuda Sadeh {-1, NULL} 47259c2be1eSYehuda Sadeh }; 47359c2be1eSYehuda Sadeh 47459c2be1eSYehuda Sadeh static int parse_rbd_opts_token(char *c, void *private) 47559c2be1eSYehuda Sadeh { 47643ae4701SAlex Elder struct rbd_options *rbd_opts = private; 47759c2be1eSYehuda Sadeh substring_t argstr[MAX_OPT_ARGS]; 47859c2be1eSYehuda Sadeh int token, intval, ret; 47959c2be1eSYehuda Sadeh 48043ae4701SAlex Elder token = match_token(c, rbd_opts_tokens, argstr); 48159c2be1eSYehuda Sadeh if (token < 0) 48259c2be1eSYehuda Sadeh return -EINVAL; 48359c2be1eSYehuda Sadeh 48459c2be1eSYehuda Sadeh if (token < Opt_last_int) { 48559c2be1eSYehuda Sadeh ret = match_int(&argstr[0], &intval); 48659c2be1eSYehuda Sadeh if (ret < 0) { 48759c2be1eSYehuda Sadeh pr_err("bad mount option arg (not int) " 48859c2be1eSYehuda Sadeh "at '%s'\n", c); 48959c2be1eSYehuda Sadeh return ret; 49059c2be1eSYehuda Sadeh } 49159c2be1eSYehuda Sadeh dout("got int token %d val %d\n", token, intval); 49259c2be1eSYehuda Sadeh } else if (token > Opt_last_int && token < Opt_last_string) { 49359c2be1eSYehuda Sadeh dout("got string token %d val %s\n", token, 49459c2be1eSYehuda Sadeh argstr[0].from); 495cc0538b6SAlex Elder } else if (token > Opt_last_string && token < Opt_last_bool) { 496cc0538b6SAlex Elder dout("got Boolean token %d\n", token); 49759c2be1eSYehuda Sadeh } else { 49859c2be1eSYehuda Sadeh dout("got token %d\n", token); 49959c2be1eSYehuda Sadeh } 50059c2be1eSYehuda Sadeh 50159c2be1eSYehuda Sadeh switch (token) { 502cc0538b6SAlex Elder case Opt_read_only: 503cc0538b6SAlex Elder rbd_opts->read_only = true; 504cc0538b6SAlex Elder break; 505cc0538b6SAlex Elder case Opt_read_write: 506cc0538b6SAlex Elder rbd_opts->read_only = false; 507cc0538b6SAlex Elder break; 50859c2be1eSYehuda Sadeh default: 509aafb230eSAlex Elder rbd_assert(false); 510aafb230eSAlex Elder break; 51159c2be1eSYehuda Sadeh } 51259c2be1eSYehuda Sadeh return 0; 51359c2be1eSYehuda Sadeh } 51459c2be1eSYehuda Sadeh 51559c2be1eSYehuda Sadeh /* 516602adf40SYehuda Sadeh * Get a ceph client with specific addr and configuration, if one does 517602adf40SYehuda Sadeh * not exist create it. 518602adf40SYehuda Sadeh */ 5199d3997fdSAlex Elder static struct rbd_client *rbd_get_client(struct ceph_options *ceph_opts) 520602adf40SYehuda Sadeh { 521f8c38929SAlex Elder struct rbd_client *rbdc; 52259c2be1eSYehuda Sadeh 5231f7ba331SAlex Elder rbdc = rbd_client_find(ceph_opts); 5249d3997fdSAlex Elder if (rbdc) /* using an existing client */ 52543ae4701SAlex Elder ceph_destroy_options(ceph_opts); 5269d3997fdSAlex Elder else 527f8c38929SAlex Elder rbdc = rbd_client_create(ceph_opts); 528d720bcb0SAlex Elder 5299d3997fdSAlex Elder return rbdc; 530602adf40SYehuda Sadeh } 531602adf40SYehuda Sadeh 532602adf40SYehuda Sadeh /* 533602adf40SYehuda Sadeh * Destroy ceph client 534d23a4b3fSAlex Elder * 535432b8587SAlex Elder * Caller must hold rbd_client_list_lock. 536602adf40SYehuda Sadeh */ 537602adf40SYehuda Sadeh static void rbd_client_release(struct kref *kref) 538602adf40SYehuda Sadeh { 539602adf40SYehuda Sadeh struct rbd_client *rbdc = container_of(kref, struct rbd_client, kref); 540602adf40SYehuda Sadeh 541602adf40SYehuda Sadeh dout("rbd_release_client %p\n", rbdc); 542cd9d9f5dSAlex Elder spin_lock(&rbd_client_list_lock); 543602adf40SYehuda Sadeh list_del(&rbdc->node); 544cd9d9f5dSAlex Elder spin_unlock(&rbd_client_list_lock); 545602adf40SYehuda Sadeh 546602adf40SYehuda Sadeh ceph_destroy_client(rbdc->client); 547602adf40SYehuda Sadeh kfree(rbdc); 548602adf40SYehuda Sadeh } 549602adf40SYehuda Sadeh 550602adf40SYehuda Sadeh /* 551602adf40SYehuda Sadeh * Drop reference to ceph client node. If it's not referenced anymore, release 552602adf40SYehuda Sadeh * it. 553602adf40SYehuda Sadeh */ 5549d3997fdSAlex Elder static void rbd_put_client(struct rbd_client *rbdc) 555602adf40SYehuda Sadeh { 556c53d5893SAlex Elder if (rbdc) 5579d3997fdSAlex Elder kref_put(&rbdc->kref, rbd_client_release); 558602adf40SYehuda Sadeh } 559602adf40SYehuda Sadeh 5601fec7093SYehuda Sadeh /* 5611fec7093SYehuda Sadeh * Destroy requests collection 5621fec7093SYehuda Sadeh */ 5631fec7093SYehuda Sadeh static void rbd_coll_release(struct kref *kref) 5641fec7093SYehuda Sadeh { 5651fec7093SYehuda Sadeh struct rbd_req_coll *coll = 5661fec7093SYehuda Sadeh container_of(kref, struct rbd_req_coll, kref); 5671fec7093SYehuda Sadeh 5681fec7093SYehuda Sadeh dout("rbd_coll_release %p\n", coll); 5691fec7093SYehuda Sadeh kfree(coll); 5701fec7093SYehuda Sadeh } 571602adf40SYehuda Sadeh 572a30b71b9SAlex Elder static bool rbd_image_format_valid(u32 image_format) 573a30b71b9SAlex Elder { 574a30b71b9SAlex Elder return image_format == 1 || image_format == 2; 575a30b71b9SAlex Elder } 576a30b71b9SAlex Elder 5778e94af8eSAlex Elder static bool rbd_dev_ondisk_valid(struct rbd_image_header_ondisk *ondisk) 5788e94af8eSAlex Elder { 579103a150fSAlex Elder size_t size; 580103a150fSAlex Elder u32 snap_count; 581103a150fSAlex Elder 582103a150fSAlex Elder /* The header has to start with the magic rbd header text */ 583103a150fSAlex Elder if (memcmp(&ondisk->text, RBD_HEADER_TEXT, sizeof (RBD_HEADER_TEXT))) 584103a150fSAlex Elder return false; 585103a150fSAlex Elder 586db2388b6SAlex Elder /* The bio layer requires at least sector-sized I/O */ 587db2388b6SAlex Elder 588db2388b6SAlex Elder if (ondisk->options.order < SECTOR_SHIFT) 589db2388b6SAlex Elder return false; 590db2388b6SAlex Elder 591db2388b6SAlex Elder /* If we use u64 in a few spots we may be able to loosen this */ 592db2388b6SAlex Elder 593db2388b6SAlex Elder if (ondisk->options.order > 8 * sizeof (int) - 1) 594db2388b6SAlex Elder return false; 595db2388b6SAlex Elder 596103a150fSAlex Elder /* 597103a150fSAlex Elder * The size of a snapshot header has to fit in a size_t, and 598103a150fSAlex Elder * that limits the number of snapshots. 599103a150fSAlex Elder */ 600103a150fSAlex Elder snap_count = le32_to_cpu(ondisk->snap_count); 601103a150fSAlex Elder size = SIZE_MAX - sizeof (struct ceph_snap_context); 602103a150fSAlex Elder if (snap_count > size / sizeof (__le64)) 603103a150fSAlex Elder return false; 604103a150fSAlex Elder 605103a150fSAlex Elder /* 606103a150fSAlex Elder * Not only that, but the size of the entire the snapshot 607103a150fSAlex Elder * header must also be representable in a size_t. 608103a150fSAlex Elder */ 609103a150fSAlex Elder size -= snap_count * sizeof (__le64); 610103a150fSAlex Elder if ((u64) size < le64_to_cpu(ondisk->snap_names_len)) 611103a150fSAlex Elder return false; 612103a150fSAlex Elder 613103a150fSAlex Elder return true; 6148e94af8eSAlex Elder } 6158e94af8eSAlex Elder 616602adf40SYehuda Sadeh /* 617602adf40SYehuda Sadeh * Create a new header structure, translate header format from the on-disk 618602adf40SYehuda Sadeh * header. 619602adf40SYehuda Sadeh */ 620602adf40SYehuda Sadeh static int rbd_header_from_disk(struct rbd_image_header *header, 6214156d998SAlex Elder struct rbd_image_header_ondisk *ondisk) 622602adf40SYehuda Sadeh { 623ccece235SAlex Elder u32 snap_count; 62458c17b0eSAlex Elder size_t len; 625d2bb24e5SAlex Elder size_t size; 626621901d6SAlex Elder u32 i; 627602adf40SYehuda Sadeh 6286a52325fSAlex Elder memset(header, 0, sizeof (*header)); 6296a52325fSAlex Elder 630103a150fSAlex Elder snap_count = le32_to_cpu(ondisk->snap_count); 631103a150fSAlex Elder 63258c17b0eSAlex Elder len = strnlen(ondisk->object_prefix, sizeof (ondisk->object_prefix)); 63358c17b0eSAlex Elder header->object_prefix = kmalloc(len + 1, GFP_KERNEL); 6346a52325fSAlex Elder if (!header->object_prefix) 635602adf40SYehuda Sadeh return -ENOMEM; 63658c17b0eSAlex Elder memcpy(header->object_prefix, ondisk->object_prefix, len); 63758c17b0eSAlex Elder header->object_prefix[len] = '\0'; 63800f1f36fSAlex Elder 639602adf40SYehuda Sadeh if (snap_count) { 640f785cc1dSAlex Elder u64 snap_names_len = le64_to_cpu(ondisk->snap_names_len); 641f785cc1dSAlex Elder 642621901d6SAlex Elder /* Save a copy of the snapshot names */ 643621901d6SAlex Elder 644f785cc1dSAlex Elder if (snap_names_len > (u64) SIZE_MAX) 645f785cc1dSAlex Elder return -EIO; 646f785cc1dSAlex Elder header->snap_names = kmalloc(snap_names_len, GFP_KERNEL); 647602adf40SYehuda Sadeh if (!header->snap_names) 6486a52325fSAlex Elder goto out_err; 649f785cc1dSAlex Elder /* 650f785cc1dSAlex Elder * Note that rbd_dev_v1_header_read() guarantees 651f785cc1dSAlex Elder * the ondisk buffer we're working with has 652f785cc1dSAlex Elder * snap_names_len bytes beyond the end of the 653f785cc1dSAlex Elder * snapshot id array, this memcpy() is safe. 654f785cc1dSAlex Elder */ 655f785cc1dSAlex Elder memcpy(header->snap_names, &ondisk->snaps[snap_count], 656f785cc1dSAlex Elder snap_names_len); 6576a52325fSAlex Elder 658621901d6SAlex Elder /* Record each snapshot's size */ 659621901d6SAlex Elder 660d2bb24e5SAlex Elder size = snap_count * sizeof (*header->snap_sizes); 661d2bb24e5SAlex Elder header->snap_sizes = kmalloc(size, GFP_KERNEL); 662602adf40SYehuda Sadeh if (!header->snap_sizes) 6636a52325fSAlex Elder goto out_err; 664621901d6SAlex Elder for (i = 0; i < snap_count; i++) 665621901d6SAlex Elder header->snap_sizes[i] = 666621901d6SAlex Elder le64_to_cpu(ondisk->snaps[i].image_size); 667602adf40SYehuda Sadeh } else { 668ccece235SAlex Elder WARN_ON(ondisk->snap_names_len); 669602adf40SYehuda Sadeh header->snap_names = NULL; 670602adf40SYehuda Sadeh header->snap_sizes = NULL; 671602adf40SYehuda Sadeh } 672849b4260SAlex Elder 67334b13184SAlex Elder header->features = 0; /* No features support in v1 images */ 674602adf40SYehuda Sadeh header->obj_order = ondisk->options.order; 675602adf40SYehuda Sadeh header->crypt_type = ondisk->options.crypt_type; 676602adf40SYehuda Sadeh header->comp_type = ondisk->options.comp_type; 6776a52325fSAlex Elder 678621901d6SAlex Elder /* Allocate and fill in the snapshot context */ 679621901d6SAlex Elder 680f84344f3SAlex Elder header->image_size = le64_to_cpu(ondisk->image_size); 6816a52325fSAlex Elder size = sizeof (struct ceph_snap_context); 6826a52325fSAlex Elder size += snap_count * sizeof (header->snapc->snaps[0]); 6836a52325fSAlex Elder header->snapc = kzalloc(size, GFP_KERNEL); 6846a52325fSAlex Elder if (!header->snapc) 6856a52325fSAlex Elder goto out_err; 686602adf40SYehuda Sadeh 687602adf40SYehuda Sadeh atomic_set(&header->snapc->nref, 1); 688505cbb9bSAlex Elder header->snapc->seq = le64_to_cpu(ondisk->snap_seq); 689602adf40SYehuda Sadeh header->snapc->num_snaps = snap_count; 690621901d6SAlex Elder for (i = 0; i < snap_count; i++) 691602adf40SYehuda Sadeh header->snapc->snaps[i] = 692602adf40SYehuda Sadeh le64_to_cpu(ondisk->snaps[i].id); 693602adf40SYehuda Sadeh 694602adf40SYehuda Sadeh return 0; 695602adf40SYehuda Sadeh 6966a52325fSAlex Elder out_err: 697849b4260SAlex Elder kfree(header->snap_sizes); 698ccece235SAlex Elder header->snap_sizes = NULL; 699602adf40SYehuda Sadeh kfree(header->snap_names); 700ccece235SAlex Elder header->snap_names = NULL; 7016a52325fSAlex Elder kfree(header->object_prefix); 7026a52325fSAlex Elder header->object_prefix = NULL; 703ccece235SAlex Elder 70400f1f36fSAlex Elder return -ENOMEM; 705602adf40SYehuda Sadeh } 706602adf40SYehuda Sadeh 7079e15b77dSAlex Elder static const char *rbd_snap_name(struct rbd_device *rbd_dev, u64 snap_id) 7089e15b77dSAlex Elder { 7099e15b77dSAlex Elder struct rbd_snap *snap; 7109e15b77dSAlex Elder 7119e15b77dSAlex Elder if (snap_id == CEPH_NOSNAP) 7129e15b77dSAlex Elder return RBD_SNAP_HEAD_NAME; 7139e15b77dSAlex Elder 7149e15b77dSAlex Elder list_for_each_entry(snap, &rbd_dev->snaps, node) 7159e15b77dSAlex Elder if (snap_id == snap->id) 7169e15b77dSAlex Elder return snap->name; 7179e15b77dSAlex Elder 7189e15b77dSAlex Elder return NULL; 7199e15b77dSAlex Elder } 7209e15b77dSAlex Elder 7218836b995SAlex Elder static int snap_by_name(struct rbd_device *rbd_dev, const char *snap_name) 722602adf40SYehuda Sadeh { 723602adf40SYehuda Sadeh 724e86924a8SAlex Elder struct rbd_snap *snap; 72500f1f36fSAlex Elder 726e86924a8SAlex Elder list_for_each_entry(snap, &rbd_dev->snaps, node) { 727e86924a8SAlex Elder if (!strcmp(snap_name, snap->name)) { 7280d7dbfceSAlex Elder rbd_dev->spec->snap_id = snap->id; 729e86924a8SAlex Elder rbd_dev->mapping.size = snap->size; 73034b13184SAlex Elder rbd_dev->mapping.features = snap->features; 73100f1f36fSAlex Elder 732e86924a8SAlex Elder return 0; 733602adf40SYehuda Sadeh } 73400f1f36fSAlex Elder } 735e86924a8SAlex Elder 73600f1f36fSAlex Elder return -ENOENT; 73700f1f36fSAlex Elder } 738602adf40SYehuda Sadeh 739819d52bfSAlex Elder static int rbd_dev_set_mapping(struct rbd_device *rbd_dev) 740602adf40SYehuda Sadeh { 74178dc447dSAlex Elder int ret; 742602adf40SYehuda Sadeh 7430d7dbfceSAlex Elder if (!memcmp(rbd_dev->spec->snap_name, RBD_SNAP_HEAD_NAME, 744cc9d734cSJosh Durgin sizeof (RBD_SNAP_HEAD_NAME))) { 7450d7dbfceSAlex Elder rbd_dev->spec->snap_id = CEPH_NOSNAP; 74699c1f08fSAlex Elder rbd_dev->mapping.size = rbd_dev->header.image_size; 74734b13184SAlex Elder rbd_dev->mapping.features = rbd_dev->header.features; 748e86924a8SAlex Elder ret = 0; 749602adf40SYehuda Sadeh } else { 7500d7dbfceSAlex Elder ret = snap_by_name(rbd_dev, rbd_dev->spec->snap_name); 751602adf40SYehuda Sadeh if (ret < 0) 752602adf40SYehuda Sadeh goto done; 753f84344f3SAlex Elder rbd_dev->mapping.read_only = true; 754602adf40SYehuda Sadeh } 755d78b650aSAlex Elder atomic_set(&rbd_dev->exists, 1); 756602adf40SYehuda Sadeh done: 757602adf40SYehuda Sadeh return ret; 758602adf40SYehuda Sadeh } 759602adf40SYehuda Sadeh 760602adf40SYehuda Sadeh static void rbd_header_free(struct rbd_image_header *header) 761602adf40SYehuda Sadeh { 762849b4260SAlex Elder kfree(header->object_prefix); 763d78fd7aeSAlex Elder header->object_prefix = NULL; 764602adf40SYehuda Sadeh kfree(header->snap_sizes); 765d78fd7aeSAlex Elder header->snap_sizes = NULL; 766849b4260SAlex Elder kfree(header->snap_names); 767d78fd7aeSAlex Elder header->snap_names = NULL; 768d1d25646SJosh Durgin ceph_put_snap_context(header->snapc); 769d78fd7aeSAlex Elder header->snapc = NULL; 770602adf40SYehuda Sadeh } 771602adf40SYehuda Sadeh 77265ccfe21SAlex Elder static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset) 773602adf40SYehuda Sadeh { 77465ccfe21SAlex Elder char *name; 77565ccfe21SAlex Elder u64 segment; 77665ccfe21SAlex Elder int ret; 777602adf40SYehuda Sadeh 7782fd82b9eSAlex Elder name = kmalloc(MAX_OBJ_NAME_SIZE + 1, GFP_NOIO); 77965ccfe21SAlex Elder if (!name) 78065ccfe21SAlex Elder return NULL; 78165ccfe21SAlex Elder segment = offset >> rbd_dev->header.obj_order; 7822fd82b9eSAlex Elder ret = snprintf(name, MAX_OBJ_NAME_SIZE + 1, "%s.%012llx", 78365ccfe21SAlex Elder rbd_dev->header.object_prefix, segment); 7842fd82b9eSAlex Elder if (ret < 0 || ret > MAX_OBJ_NAME_SIZE) { 78565ccfe21SAlex Elder pr_err("error formatting segment name for #%llu (%d)\n", 78665ccfe21SAlex Elder segment, ret); 78765ccfe21SAlex Elder kfree(name); 78865ccfe21SAlex Elder name = NULL; 78965ccfe21SAlex Elder } 790602adf40SYehuda Sadeh 79165ccfe21SAlex Elder return name; 79265ccfe21SAlex Elder } 793602adf40SYehuda Sadeh 79465ccfe21SAlex Elder static u64 rbd_segment_offset(struct rbd_device *rbd_dev, u64 offset) 79565ccfe21SAlex Elder { 79665ccfe21SAlex Elder u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; 797602adf40SYehuda Sadeh 79865ccfe21SAlex Elder return offset & (segment_size - 1); 79965ccfe21SAlex Elder } 80065ccfe21SAlex Elder 80165ccfe21SAlex Elder static u64 rbd_segment_length(struct rbd_device *rbd_dev, 80265ccfe21SAlex Elder u64 offset, u64 length) 80365ccfe21SAlex Elder { 80465ccfe21SAlex Elder u64 segment_size = (u64) 1 << rbd_dev->header.obj_order; 80565ccfe21SAlex Elder 80665ccfe21SAlex Elder offset &= segment_size - 1; 80765ccfe21SAlex Elder 808aafb230eSAlex Elder rbd_assert(length <= U64_MAX - offset); 80965ccfe21SAlex Elder if (offset + length > segment_size) 81065ccfe21SAlex Elder length = segment_size - offset; 81165ccfe21SAlex Elder 81265ccfe21SAlex Elder return length; 813602adf40SYehuda Sadeh } 814602adf40SYehuda Sadeh 8151fec7093SYehuda Sadeh static int rbd_get_num_segments(struct rbd_image_header *header, 8161fec7093SYehuda Sadeh u64 ofs, u64 len) 8171fec7093SYehuda Sadeh { 818df111be6SAlex Elder u64 start_seg; 819df111be6SAlex Elder u64 end_seg; 820df111be6SAlex Elder 821df111be6SAlex Elder if (!len) 822df111be6SAlex Elder return 0; 823df111be6SAlex Elder if (len - 1 > U64_MAX - ofs) 824df111be6SAlex Elder return -ERANGE; 825df111be6SAlex Elder 826df111be6SAlex Elder start_seg = ofs >> header->obj_order; 827df111be6SAlex Elder end_seg = (ofs + len - 1) >> header->obj_order; 828df111be6SAlex Elder 8291fec7093SYehuda Sadeh return end_seg - start_seg + 1; 8301fec7093SYehuda Sadeh } 8311fec7093SYehuda Sadeh 832602adf40SYehuda Sadeh /* 833029bcbd8SJosh Durgin * returns the size of an object in the image 834029bcbd8SJosh Durgin */ 835029bcbd8SJosh Durgin static u64 rbd_obj_bytes(struct rbd_image_header *header) 836029bcbd8SJosh Durgin { 837029bcbd8SJosh Durgin return 1 << header->obj_order; 838029bcbd8SJosh Durgin } 839029bcbd8SJosh Durgin 840029bcbd8SJosh Durgin /* 841602adf40SYehuda Sadeh * bio helpers 842602adf40SYehuda Sadeh */ 843602adf40SYehuda Sadeh 844602adf40SYehuda Sadeh static void bio_chain_put(struct bio *chain) 845602adf40SYehuda Sadeh { 846602adf40SYehuda Sadeh struct bio *tmp; 847602adf40SYehuda Sadeh 848602adf40SYehuda Sadeh while (chain) { 849602adf40SYehuda Sadeh tmp = chain; 850602adf40SYehuda Sadeh chain = chain->bi_next; 851602adf40SYehuda Sadeh bio_put(tmp); 852602adf40SYehuda Sadeh } 853602adf40SYehuda Sadeh } 854602adf40SYehuda Sadeh 855602adf40SYehuda Sadeh /* 856602adf40SYehuda Sadeh * zeros a bio chain, starting at specific offset 857602adf40SYehuda Sadeh */ 858602adf40SYehuda Sadeh static void zero_bio_chain(struct bio *chain, int start_ofs) 859602adf40SYehuda Sadeh { 860602adf40SYehuda Sadeh struct bio_vec *bv; 861602adf40SYehuda Sadeh unsigned long flags; 862602adf40SYehuda Sadeh void *buf; 863602adf40SYehuda Sadeh int i; 864602adf40SYehuda Sadeh int pos = 0; 865602adf40SYehuda Sadeh 866602adf40SYehuda Sadeh while (chain) { 867602adf40SYehuda Sadeh bio_for_each_segment(bv, chain, i) { 868602adf40SYehuda Sadeh if (pos + bv->bv_len > start_ofs) { 869602adf40SYehuda Sadeh int remainder = max(start_ofs - pos, 0); 870602adf40SYehuda Sadeh buf = bvec_kmap_irq(bv, &flags); 871602adf40SYehuda Sadeh memset(buf + remainder, 0, 872602adf40SYehuda Sadeh bv->bv_len - remainder); 87385b5aaa6SDan Carpenter bvec_kunmap_irq(buf, &flags); 874602adf40SYehuda Sadeh } 875602adf40SYehuda Sadeh pos += bv->bv_len; 876602adf40SYehuda Sadeh } 877602adf40SYehuda Sadeh 878602adf40SYehuda Sadeh chain = chain->bi_next; 879602adf40SYehuda Sadeh } 880602adf40SYehuda Sadeh } 881602adf40SYehuda Sadeh 882602adf40SYehuda Sadeh /* 883f7760dadSAlex Elder * Clone a portion of a bio, starting at the given byte offset 884f7760dadSAlex Elder * and continuing for the number of bytes indicated. 885602adf40SYehuda Sadeh */ 886f7760dadSAlex Elder static struct bio *bio_clone_range(struct bio *bio_src, 887f7760dadSAlex Elder unsigned int offset, 888f7760dadSAlex Elder unsigned int len, 889f7760dadSAlex Elder gfp_t gfpmask) 890602adf40SYehuda Sadeh { 891f7760dadSAlex Elder struct bio_vec *bv; 892f7760dadSAlex Elder unsigned int resid; 893f7760dadSAlex Elder unsigned short idx; 894f7760dadSAlex Elder unsigned int voff; 895f7760dadSAlex Elder unsigned short end_idx; 896f7760dadSAlex Elder unsigned short vcnt; 897f7760dadSAlex Elder struct bio *bio; 898602adf40SYehuda Sadeh 899f7760dadSAlex Elder /* Handle the easy case for the caller */ 900f7760dadSAlex Elder 901f7760dadSAlex Elder if (!offset && len == bio_src->bi_size) 902f7760dadSAlex Elder return bio_clone(bio_src, gfpmask); 903f7760dadSAlex Elder 904f7760dadSAlex Elder if (WARN_ON_ONCE(!len)) 905f7760dadSAlex Elder return NULL; 906f7760dadSAlex Elder if (WARN_ON_ONCE(len > bio_src->bi_size)) 907f7760dadSAlex Elder return NULL; 908f7760dadSAlex Elder if (WARN_ON_ONCE(offset > bio_src->bi_size - len)) 909f7760dadSAlex Elder return NULL; 910f7760dadSAlex Elder 911f7760dadSAlex Elder /* Find first affected segment... */ 912f7760dadSAlex Elder 913f7760dadSAlex Elder resid = offset; 914f7760dadSAlex Elder __bio_for_each_segment(bv, bio_src, idx, 0) { 915f7760dadSAlex Elder if (resid < bv->bv_len) 916f7760dadSAlex Elder break; 917f7760dadSAlex Elder resid -= bv->bv_len; 918602adf40SYehuda Sadeh } 919f7760dadSAlex Elder voff = resid; 920602adf40SYehuda Sadeh 921f7760dadSAlex Elder /* ...and the last affected segment */ 922542582fcSAlex Elder 923f7760dadSAlex Elder resid += len; 924f7760dadSAlex Elder __bio_for_each_segment(bv, bio_src, end_idx, idx) { 925f7760dadSAlex Elder if (resid <= bv->bv_len) 926f7760dadSAlex Elder break; 927f7760dadSAlex Elder resid -= bv->bv_len; 928f7760dadSAlex Elder } 929f7760dadSAlex Elder vcnt = end_idx - idx + 1; 930602adf40SYehuda Sadeh 931f7760dadSAlex Elder /* Build the clone */ 932f7760dadSAlex Elder 933f7760dadSAlex Elder bio = bio_alloc(gfpmask, (unsigned int) vcnt); 934f7760dadSAlex Elder if (!bio) 935f7760dadSAlex Elder return NULL; /* ENOMEM */ 936f7760dadSAlex Elder 937f7760dadSAlex Elder bio->bi_bdev = bio_src->bi_bdev; 938f7760dadSAlex Elder bio->bi_sector = bio_src->bi_sector + (offset >> SECTOR_SHIFT); 939f7760dadSAlex Elder bio->bi_rw = bio_src->bi_rw; 940f7760dadSAlex Elder bio->bi_flags |= 1 << BIO_CLONED; 941602adf40SYehuda Sadeh 942602adf40SYehuda Sadeh /* 943f7760dadSAlex Elder * Copy over our part of the bio_vec, then update the first 944f7760dadSAlex Elder * and last (or only) entries. 945602adf40SYehuda Sadeh */ 946f7760dadSAlex Elder memcpy(&bio->bi_io_vec[0], &bio_src->bi_io_vec[idx], 947f7760dadSAlex Elder vcnt * sizeof (struct bio_vec)); 948f7760dadSAlex Elder bio->bi_io_vec[0].bv_offset += voff; 949f7760dadSAlex Elder if (vcnt > 1) { 950f7760dadSAlex Elder bio->bi_io_vec[0].bv_len -= voff; 951f7760dadSAlex Elder bio->bi_io_vec[vcnt - 1].bv_len = resid; 952602adf40SYehuda Sadeh } else { 953f7760dadSAlex Elder bio->bi_io_vec[0].bv_len = len; 954602adf40SYehuda Sadeh } 955602adf40SYehuda Sadeh 956f7760dadSAlex Elder bio->bi_vcnt = vcnt; 957f7760dadSAlex Elder bio->bi_size = len; 958f7760dadSAlex Elder bio->bi_idx = 0; 959602adf40SYehuda Sadeh 960f7760dadSAlex Elder return bio; 961602adf40SYehuda Sadeh } 962602adf40SYehuda Sadeh 963f7760dadSAlex Elder /* 964f7760dadSAlex Elder * Clone a portion of a bio chain, starting at the given byte offset 965f7760dadSAlex Elder * into the first bio in the source chain and continuing for the 966f7760dadSAlex Elder * number of bytes indicated. The result is another bio chain of 967f7760dadSAlex Elder * exactly the given length, or a null pointer on error. 968f7760dadSAlex Elder * 969f7760dadSAlex Elder * The bio_src and offset parameters are both in-out. On entry they 970f7760dadSAlex Elder * refer to the first source bio and the offset into that bio where 971f7760dadSAlex Elder * the start of data to be cloned is located. 972f7760dadSAlex Elder * 973f7760dadSAlex Elder * On return, bio_src is updated to refer to the bio in the source 974f7760dadSAlex Elder * chain that contains first un-cloned byte, and *offset will 975f7760dadSAlex Elder * contain the offset of that byte within that bio. 976f7760dadSAlex Elder */ 977f7760dadSAlex Elder static struct bio *bio_chain_clone_range(struct bio **bio_src, 978f7760dadSAlex Elder unsigned int *offset, 979f7760dadSAlex Elder unsigned int len, 980f7760dadSAlex Elder gfp_t gfpmask) 981f7760dadSAlex Elder { 982f7760dadSAlex Elder struct bio *bi = *bio_src; 983f7760dadSAlex Elder unsigned int off = *offset; 984f7760dadSAlex Elder struct bio *chain = NULL; 985f7760dadSAlex Elder struct bio **end; 986602adf40SYehuda Sadeh 987f7760dadSAlex Elder /* Build up a chain of clone bios up to the limit */ 988602adf40SYehuda Sadeh 989f7760dadSAlex Elder if (!bi || off >= bi->bi_size || !len) 990f7760dadSAlex Elder return NULL; /* Nothing to clone */ 991602adf40SYehuda Sadeh 992f7760dadSAlex Elder end = &chain; 993f7760dadSAlex Elder while (len) { 994f7760dadSAlex Elder unsigned int bi_size; 995f7760dadSAlex Elder struct bio *bio; 996f7760dadSAlex Elder 997f5400b7aSAlex Elder if (!bi) { 998f5400b7aSAlex Elder rbd_warn(NULL, "bio_chain exhausted with %u left", len); 999f7760dadSAlex Elder goto out_err; /* EINVAL; ran out of bio's */ 1000f5400b7aSAlex Elder } 1001f7760dadSAlex Elder bi_size = min_t(unsigned int, bi->bi_size - off, len); 1002f7760dadSAlex Elder bio = bio_clone_range(bi, off, bi_size, gfpmask); 1003f7760dadSAlex Elder if (!bio) 1004f7760dadSAlex Elder goto out_err; /* ENOMEM */ 1005f7760dadSAlex Elder 1006f7760dadSAlex Elder *end = bio; 1007f7760dadSAlex Elder end = &bio->bi_next; 1008f7760dadSAlex Elder 1009f7760dadSAlex Elder off += bi_size; 1010f7760dadSAlex Elder if (off == bi->bi_size) { 1011f7760dadSAlex Elder bi = bi->bi_next; 1012f7760dadSAlex Elder off = 0; 1013f7760dadSAlex Elder } 1014f7760dadSAlex Elder len -= bi_size; 1015f7760dadSAlex Elder } 1016f7760dadSAlex Elder *bio_src = bi; 1017f7760dadSAlex Elder *offset = off; 1018f7760dadSAlex Elder 1019f7760dadSAlex Elder return chain; 1020f7760dadSAlex Elder out_err: 1021f7760dadSAlex Elder bio_chain_put(chain); 1022f7760dadSAlex Elder 1023602adf40SYehuda Sadeh return NULL; 1024602adf40SYehuda Sadeh } 1025602adf40SYehuda Sadeh 1026139b4318SAlex Elder static struct ceph_osd_req_op *rbd_create_rw_op(int opcode, u32 payload_len) 1027602adf40SYehuda Sadeh { 1028139b4318SAlex Elder struct ceph_osd_req_op *op; 102957cfc106SAlex Elder 1030139b4318SAlex Elder op = kzalloc(sizeof (*op), GFP_NOIO); 1031139b4318SAlex Elder if (!op) 103257cfc106SAlex Elder return NULL; 1033602adf40SYehuda Sadeh /* 1034602adf40SYehuda Sadeh * op extent offset and length will be set later on 1035e01e7927SAlex Elder * after ceph_calc_file_object_mapping(). 1036602adf40SYehuda Sadeh */ 1037139b4318SAlex Elder op->op = opcode; 1038139b4318SAlex Elder op->payload_len = payload_len; 103957cfc106SAlex Elder 1040139b4318SAlex Elder return op; 1041602adf40SYehuda Sadeh } 1042602adf40SYehuda Sadeh 1043139b4318SAlex Elder static void rbd_destroy_op(struct ceph_osd_req_op *op) 1044602adf40SYehuda Sadeh { 1045139b4318SAlex Elder kfree(op); 1046602adf40SYehuda Sadeh } 1047602adf40SYehuda Sadeh 10481fec7093SYehuda Sadeh static void rbd_coll_end_req_index(struct request *rq, 10491fec7093SYehuda Sadeh struct rbd_req_coll *coll, 10501fec7093SYehuda Sadeh int index, 10518986cb37SAlex Elder s32 ret, u64 len) 10521fec7093SYehuda Sadeh { 10531fec7093SYehuda Sadeh struct request_queue *q; 10541fec7093SYehuda Sadeh int min, max, i; 10551fec7093SYehuda Sadeh 1056bd919d45SAlex Elder dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n", 10578986cb37SAlex Elder coll, index, (int)ret, (unsigned long long)len); 10581fec7093SYehuda Sadeh 10591fec7093SYehuda Sadeh if (!rq) 10601fec7093SYehuda Sadeh return; 10611fec7093SYehuda Sadeh 10621fec7093SYehuda Sadeh if (!coll) { 10631fec7093SYehuda Sadeh blk_end_request(rq, ret, len); 10641fec7093SYehuda Sadeh return; 10651fec7093SYehuda Sadeh } 10661fec7093SYehuda Sadeh 10671fec7093SYehuda Sadeh q = rq->q; 10681fec7093SYehuda Sadeh 10691fec7093SYehuda Sadeh spin_lock_irq(q->queue_lock); 10701fec7093SYehuda Sadeh coll->status[index].done = 1; 10711fec7093SYehuda Sadeh coll->status[index].rc = ret; 10721fec7093SYehuda Sadeh coll->status[index].bytes = len; 10731fec7093SYehuda Sadeh max = min = coll->num_done; 10741fec7093SYehuda Sadeh while (max < coll->total && coll->status[max].done) 10751fec7093SYehuda Sadeh max++; 10761fec7093SYehuda Sadeh 10771fec7093SYehuda Sadeh for (i = min; i<max; i++) { 10788986cb37SAlex Elder __blk_end_request(rq, (int)coll->status[i].rc, 10791fec7093SYehuda Sadeh coll->status[i].bytes); 10801fec7093SYehuda Sadeh coll->num_done++; 10811fec7093SYehuda Sadeh kref_put(&coll->kref, rbd_coll_release); 10821fec7093SYehuda Sadeh } 10831fec7093SYehuda Sadeh spin_unlock_irq(q->queue_lock); 10841fec7093SYehuda Sadeh } 10851fec7093SYehuda Sadeh 1086725afc97SAlex Elder static void rbd_coll_end_req(struct rbd_request *rbd_req, 10878986cb37SAlex Elder s32 ret, u64 len) 10881fec7093SYehuda Sadeh { 1089725afc97SAlex Elder rbd_coll_end_req_index(rbd_req->rq, 1090725afc97SAlex Elder rbd_req->coll, rbd_req->coll_index, 1091725afc97SAlex Elder ret, len); 10921fec7093SYehuda Sadeh } 10931fec7093SYehuda Sadeh 10940ec8ce87SAlex Elder static void rbd_layout_init(struct ceph_file_layout *layout, u64 pool_id) 10950ec8ce87SAlex Elder { 10960ec8ce87SAlex Elder memset(layout, 0, sizeof (*layout)); 10970ec8ce87SAlex Elder layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); 10980ec8ce87SAlex Elder layout->fl_stripe_count = cpu_to_le32(1); 10990ec8ce87SAlex Elder layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER); 11000ec8ce87SAlex Elder rbd_assert(pool_id <= (u64) U32_MAX); 11010ec8ce87SAlex Elder layout->fl_pg_pool = cpu_to_le32((u32) pool_id); 11020ec8ce87SAlex Elder } 11030ec8ce87SAlex Elder 1104602adf40SYehuda Sadeh /* 1105602adf40SYehuda Sadeh * Send ceph osd request 1106602adf40SYehuda Sadeh */ 1107602adf40SYehuda Sadeh static int rbd_do_request(struct request *rq, 11080ce1a794SAlex Elder struct rbd_device *rbd_dev, 1109602adf40SYehuda Sadeh struct ceph_snap_context *snapc, 1110602adf40SYehuda Sadeh u64 snapid, 1111aded07eaSAlex Elder const char *object_name, u64 ofs, u64 len, 1112602adf40SYehuda Sadeh struct bio *bio, 1113602adf40SYehuda Sadeh struct page **pages, 1114602adf40SYehuda Sadeh int num_pages, 1115602adf40SYehuda Sadeh int flags, 111630573d68SAlex Elder struct ceph_osd_req_op *op, 11171fec7093SYehuda Sadeh struct rbd_req_coll *coll, 11181fec7093SYehuda Sadeh int coll_index, 11195f29ddd4SAlex Elder void (*rbd_cb)(struct ceph_osd_request *, 11205f29ddd4SAlex Elder struct ceph_msg *), 112159c2be1eSYehuda Sadeh struct ceph_osd_request **linger_req, 112259c2be1eSYehuda Sadeh u64 *ver) 1123602adf40SYehuda Sadeh { 11245f29ddd4SAlex Elder struct ceph_osd_request *osd_req; 1125602adf40SYehuda Sadeh int ret; 1126602adf40SYehuda Sadeh u64 bno; 1127e01e7927SAlex Elder u64 obj_off = 0; 1128e01e7927SAlex Elder u64 obj_len = 0; 1129602adf40SYehuda Sadeh struct timespec mtime = CURRENT_TIME; 1130725afc97SAlex Elder struct rbd_request *rbd_req; 11311dbb4399SAlex Elder struct ceph_osd_client *osdc; 1132602adf40SYehuda Sadeh 1133725afc97SAlex Elder rbd_req = kzalloc(sizeof(*rbd_req), GFP_NOIO); 1134cd323ac0SAlex Elder if (!rbd_req) 11351fec7093SYehuda Sadeh return -ENOMEM; 1136602adf40SYehuda Sadeh 11371fec7093SYehuda Sadeh if (coll) { 1138725afc97SAlex Elder rbd_req->coll = coll; 1139725afc97SAlex Elder rbd_req->coll_index = coll_index; 11401fec7093SYehuda Sadeh } 11411fec7093SYehuda Sadeh 1142f7760dadSAlex Elder dout("rbd_do_request object_name=%s ofs=%llu len=%llu coll=%p[%d]\n", 1143f7760dadSAlex Elder object_name, (unsigned long long) ofs, 1144f7760dadSAlex Elder (unsigned long long) len, coll, coll_index); 1145602adf40SYehuda Sadeh 11460ce1a794SAlex Elder osdc = &rbd_dev->rbd_client->client->osdc; 114730573d68SAlex Elder osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_NOIO); 11485f29ddd4SAlex Elder if (!osd_req) { 11494ad12621SSage Weil ret = -ENOMEM; 1150602adf40SYehuda Sadeh goto done_pages; 1151602adf40SYehuda Sadeh } 1152602adf40SYehuda Sadeh 1153d178a9e7SAlex Elder osd_req->r_flags = flags; 115454a54007SAlex Elder osd_req->r_pages = pages; 115554a54007SAlex Elder if (bio) { 115654a54007SAlex Elder osd_req->r_bio = bio; 115754a54007SAlex Elder bio_get(osd_req->r_bio); 115854a54007SAlex Elder } 11595f29ddd4SAlex Elder osd_req->r_callback = rbd_cb; 1160602adf40SYehuda Sadeh 1161725afc97SAlex Elder rbd_req->rq = rq; 1162725afc97SAlex Elder rbd_req->bio = bio; 1163725afc97SAlex Elder rbd_req->pages = pages; 1164725afc97SAlex Elder rbd_req->len = len; 1165602adf40SYehuda Sadeh 11665f29ddd4SAlex Elder osd_req->r_priv = rbd_req; 1167602adf40SYehuda Sadeh 11685f29ddd4SAlex Elder strncpy(osd_req->r_oid, object_name, sizeof(osd_req->r_oid)); 11695f29ddd4SAlex Elder osd_req->r_oid_len = strlen(osd_req->r_oid); 1170602adf40SYehuda Sadeh 11710ec8ce87SAlex Elder rbd_layout_init(&osd_req->r_file_layout, rbd_dev->spec->pool_id); 1172e01e7927SAlex Elder ret = ceph_calc_file_object_mapping(&osd_req->r_file_layout, ofs, len, 1173e01e7927SAlex Elder &bno, &obj_off, &obj_len); 11746cae3717SSage Weil rbd_assert(ret == 0); 1175e01e7927SAlex Elder if (obj_len < len) { 1176e01e7927SAlex Elder dout(" skipping last %llu, final file extent %llu~%llu\n", 1177e01e7927SAlex Elder len - obj_len, ofs, obj_len); 1178e01e7927SAlex Elder len = obj_len; 1179e01e7927SAlex Elder } 1180e01e7927SAlex Elder if (op->op == CEPH_OSD_OP_READ || op->op == CEPH_OSD_OP_WRITE) { 1181e01e7927SAlex Elder op->extent.offset = obj_off; 1182e01e7927SAlex Elder op->extent.length = obj_len; 1183e01e7927SAlex Elder if (op->op == CEPH_OSD_OP_WRITE) 1184e01e7927SAlex Elder op->payload_len = obj_len; 1185e01e7927SAlex Elder } 1186e01e7927SAlex Elder osd_req->r_num_pages = calc_pages_for(ofs, len); 1187e01e7927SAlex Elder osd_req->r_page_alignment = ofs & ~PAGE_MASK; 1188602adf40SYehuda Sadeh 118930573d68SAlex Elder ceph_osdc_build_request(osd_req, ofs, len, 1, op, 1190ae7ca4a3SAlex Elder snapc, snapid, &mtime); 1191602adf40SYehuda Sadeh 119259c2be1eSYehuda Sadeh if (linger_req) { 11935f29ddd4SAlex Elder ceph_osdc_set_request_linger(osdc, osd_req); 11945f29ddd4SAlex Elder *linger_req = osd_req; 119559c2be1eSYehuda Sadeh } 119659c2be1eSYehuda Sadeh 11975f29ddd4SAlex Elder ret = ceph_osdc_start_request(osdc, osd_req, false); 1198602adf40SYehuda Sadeh if (ret < 0) 1199602adf40SYehuda Sadeh goto done_err; 1200602adf40SYehuda Sadeh 1201602adf40SYehuda Sadeh if (!rbd_cb) { 12025f29ddd4SAlex Elder u64 version; 12035f29ddd4SAlex Elder 12045f29ddd4SAlex Elder ret = ceph_osdc_wait_request(osdc, osd_req); 12055f29ddd4SAlex Elder version = le64_to_cpu(osd_req->r_reassert_version.version); 120659c2be1eSYehuda Sadeh if (ver) 12075f29ddd4SAlex Elder *ver = version; 12085f29ddd4SAlex Elder dout("reassert_ver=%llu\n", (unsigned long long) version); 12095f29ddd4SAlex Elder ceph_osdc_put_request(osd_req); 1210602adf40SYehuda Sadeh } 1211602adf40SYehuda Sadeh return ret; 1212602adf40SYehuda Sadeh 1213602adf40SYehuda Sadeh done_err: 1214725afc97SAlex Elder bio_chain_put(rbd_req->bio); 12155f29ddd4SAlex Elder ceph_osdc_put_request(osd_req); 1216602adf40SYehuda Sadeh done_pages: 1217725afc97SAlex Elder kfree(rbd_req); 1218602adf40SYehuda Sadeh return ret; 1219602adf40SYehuda Sadeh } 1220602adf40SYehuda Sadeh 1221602adf40SYehuda Sadeh /* 1222602adf40SYehuda Sadeh * Ceph osd op callback 1223602adf40SYehuda Sadeh */ 12245f29ddd4SAlex Elder static void rbd_req_cb(struct ceph_osd_request *osd_req, struct ceph_msg *msg) 1225602adf40SYehuda Sadeh { 12265f29ddd4SAlex Elder struct rbd_request *rbd_req = osd_req->r_priv; 1227602adf40SYehuda Sadeh struct ceph_osd_reply_head *replyhead; 1228602adf40SYehuda Sadeh struct ceph_osd_op *op; 12298986cb37SAlex Elder s32 rc; 1230602adf40SYehuda Sadeh u64 bytes; 1231602adf40SYehuda Sadeh int read_op; 1232602adf40SYehuda Sadeh 1233602adf40SYehuda Sadeh /* parse reply */ 1234602adf40SYehuda Sadeh replyhead = msg->front.iov_base; 1235602adf40SYehuda Sadeh WARN_ON(le32_to_cpu(replyhead->num_ops) == 0); 1236602adf40SYehuda Sadeh op = (void *)(replyhead + 1); 12378986cb37SAlex Elder rc = (s32)le32_to_cpu(replyhead->result); 1238602adf40SYehuda Sadeh bytes = le64_to_cpu(op->extent.length); 1239895cfcc8SDan Carpenter read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ); 1240602adf40SYehuda Sadeh 1241bd919d45SAlex Elder dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n", 1242bd919d45SAlex Elder (unsigned long long) bytes, read_op, (int) rc); 1243602adf40SYehuda Sadeh 12448986cb37SAlex Elder if (rc == (s32)-ENOENT && read_op) { 1245725afc97SAlex Elder zero_bio_chain(rbd_req->bio, 0); 1246602adf40SYehuda Sadeh rc = 0; 1247725afc97SAlex Elder } else if (rc == 0 && read_op && bytes < rbd_req->len) { 1248725afc97SAlex Elder zero_bio_chain(rbd_req->bio, bytes); 1249725afc97SAlex Elder bytes = rbd_req->len; 1250602adf40SYehuda Sadeh } 1251602adf40SYehuda Sadeh 1252725afc97SAlex Elder rbd_coll_end_req(rbd_req, rc, bytes); 1253602adf40SYehuda Sadeh 1254725afc97SAlex Elder if (rbd_req->bio) 1255725afc97SAlex Elder bio_chain_put(rbd_req->bio); 1256602adf40SYehuda Sadeh 12575f29ddd4SAlex Elder ceph_osdc_put_request(osd_req); 1258725afc97SAlex Elder kfree(rbd_req); 1259602adf40SYehuda Sadeh } 1260602adf40SYehuda Sadeh 12615f29ddd4SAlex Elder static void rbd_simple_req_cb(struct ceph_osd_request *osd_req, 12625f29ddd4SAlex Elder struct ceph_msg *msg) 126359c2be1eSYehuda Sadeh { 12645f29ddd4SAlex Elder ceph_osdc_put_request(osd_req); 126559c2be1eSYehuda Sadeh } 126659c2be1eSYehuda Sadeh 1267602adf40SYehuda Sadeh /* 1268602adf40SYehuda Sadeh * Do a synchronous ceph osd operation 1269602adf40SYehuda Sadeh */ 12700ce1a794SAlex Elder static int rbd_req_sync_op(struct rbd_device *rbd_dev, 1271602adf40SYehuda Sadeh int flags, 127230573d68SAlex Elder struct ceph_osd_req_op *op, 1273aded07eaSAlex Elder const char *object_name, 1274f8d4de6eSAlex Elder u64 ofs, u64 inbound_size, 1275f8d4de6eSAlex Elder char *inbound, 127659c2be1eSYehuda Sadeh struct ceph_osd_request **linger_req, 127759c2be1eSYehuda Sadeh u64 *ver) 1278602adf40SYehuda Sadeh { 1279602adf40SYehuda Sadeh int ret; 1280602adf40SYehuda Sadeh struct page **pages; 1281602adf40SYehuda Sadeh int num_pages; 1282913d2fdcSAlex Elder 128330573d68SAlex Elder rbd_assert(op != NULL); 1284602adf40SYehuda Sadeh 1285f8d4de6eSAlex Elder num_pages = calc_pages_for(ofs, inbound_size); 1286602adf40SYehuda Sadeh pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL); 1287b8d0638aSDan Carpenter if (IS_ERR(pages)) 1288b8d0638aSDan Carpenter return PTR_ERR(pages); 1289602adf40SYehuda Sadeh 129025704ac9SAlex Elder ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, 1291f8d4de6eSAlex Elder object_name, ofs, inbound_size, NULL, 1292602adf40SYehuda Sadeh pages, num_pages, 1293602adf40SYehuda Sadeh flags, 129430573d68SAlex Elder op, 12951fec7093SYehuda Sadeh NULL, 0, 129659c2be1eSYehuda Sadeh NULL, 129759c2be1eSYehuda Sadeh linger_req, ver); 1298602adf40SYehuda Sadeh if (ret < 0) 1299913d2fdcSAlex Elder goto done; 1300602adf40SYehuda Sadeh 1301f8d4de6eSAlex Elder if ((flags & CEPH_OSD_FLAG_READ) && inbound) 1302f8d4de6eSAlex Elder ret = ceph_copy_from_page_vector(pages, inbound, ofs, ret); 1303602adf40SYehuda Sadeh 1304602adf40SYehuda Sadeh done: 1305602adf40SYehuda Sadeh ceph_release_page_vector(pages, num_pages); 1306602adf40SYehuda Sadeh return ret; 1307602adf40SYehuda Sadeh } 1308602adf40SYehuda Sadeh 1309602adf40SYehuda Sadeh /* 1310602adf40SYehuda Sadeh * Do an asynchronous ceph osd operation 1311602adf40SYehuda Sadeh */ 1312602adf40SYehuda Sadeh static int rbd_do_op(struct request *rq, 1313602adf40SYehuda Sadeh struct rbd_device *rbd_dev, 1314602adf40SYehuda Sadeh struct ceph_snap_context *snapc, 1315602adf40SYehuda Sadeh u64 ofs, u64 len, 13161fec7093SYehuda Sadeh struct bio *bio, 13171fec7093SYehuda Sadeh struct rbd_req_coll *coll, 13181fec7093SYehuda Sadeh int coll_index) 1319602adf40SYehuda Sadeh { 1320602adf40SYehuda Sadeh char *seg_name; 1321602adf40SYehuda Sadeh u64 seg_ofs; 1322602adf40SYehuda Sadeh u64 seg_len; 1323602adf40SYehuda Sadeh int ret; 1324139b4318SAlex Elder struct ceph_osd_req_op *op; 1325602adf40SYehuda Sadeh u32 payload_len; 1326ff2e4bb5SAlex Elder int opcode; 1327ff2e4bb5SAlex Elder int flags; 13284634246dSAlex Elder u64 snapid; 1329602adf40SYehuda Sadeh 133065ccfe21SAlex Elder seg_name = rbd_segment_name(rbd_dev, ofs); 1331602adf40SYehuda Sadeh if (!seg_name) 1332602adf40SYehuda Sadeh return -ENOMEM; 133365ccfe21SAlex Elder seg_len = rbd_segment_length(rbd_dev, ofs, len); 133465ccfe21SAlex Elder seg_ofs = rbd_segment_offset(rbd_dev, ofs); 1335602adf40SYehuda Sadeh 1336ff2e4bb5SAlex Elder if (rq_data_dir(rq) == WRITE) { 1337ff2e4bb5SAlex Elder opcode = CEPH_OSD_OP_WRITE; 1338ff2e4bb5SAlex Elder flags = CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK; 13394634246dSAlex Elder snapid = CEPH_NOSNAP; 1340ff2e4bb5SAlex Elder payload_len = seg_len; 1341ff2e4bb5SAlex Elder } else { 1342ff2e4bb5SAlex Elder opcode = CEPH_OSD_OP_READ; 1343ff2e4bb5SAlex Elder flags = CEPH_OSD_FLAG_READ; 1344a7b4c65fSAlex Elder rbd_assert(!snapc); 13450d7dbfceSAlex Elder snapid = rbd_dev->spec->snap_id; 1346ff2e4bb5SAlex Elder payload_len = 0; 1347ff2e4bb5SAlex Elder } 1348602adf40SYehuda Sadeh 134957cfc106SAlex Elder ret = -ENOMEM; 1350139b4318SAlex Elder op = rbd_create_rw_op(opcode, payload_len); 1351139b4318SAlex Elder if (!op) 1352602adf40SYehuda Sadeh goto done; 1353602adf40SYehuda Sadeh 1354602adf40SYehuda Sadeh /* we've taken care of segment sizes earlier when we 1355602adf40SYehuda Sadeh cloned the bios. We should never have a segment 1356602adf40SYehuda Sadeh truncated at this point */ 1357aafb230eSAlex Elder rbd_assert(seg_len == len); 1358602adf40SYehuda Sadeh 1359602adf40SYehuda Sadeh ret = rbd_do_request(rq, rbd_dev, snapc, snapid, 1360602adf40SYehuda Sadeh seg_name, seg_ofs, seg_len, 1361602adf40SYehuda Sadeh bio, 1362602adf40SYehuda Sadeh NULL, 0, 1363602adf40SYehuda Sadeh flags, 136430573d68SAlex Elder op, 13651fec7093SYehuda Sadeh coll, coll_index, 136659c2be1eSYehuda Sadeh rbd_req_cb, 0, NULL); 1367cd323ac0SAlex Elder if (ret < 0) 1368cd323ac0SAlex Elder rbd_coll_end_req_index(rq, coll, coll_index, 1369cd323ac0SAlex Elder (s32)ret, seg_len); 1370139b4318SAlex Elder rbd_destroy_op(op); 1371602adf40SYehuda Sadeh done: 1372602adf40SYehuda Sadeh kfree(seg_name); 1373602adf40SYehuda Sadeh return ret; 1374602adf40SYehuda Sadeh } 1375602adf40SYehuda Sadeh 1376602adf40SYehuda Sadeh /* 1377602adf40SYehuda Sadeh * Request sync osd read 1378602adf40SYehuda Sadeh */ 13790ce1a794SAlex Elder static int rbd_req_sync_read(struct rbd_device *rbd_dev, 1380aded07eaSAlex Elder const char *object_name, 1381602adf40SYehuda Sadeh u64 ofs, u64 len, 138259c2be1eSYehuda Sadeh char *buf, 138359c2be1eSYehuda Sadeh u64 *ver) 1384602adf40SYehuda Sadeh { 1385139b4318SAlex Elder struct ceph_osd_req_op *op; 1386913d2fdcSAlex Elder int ret; 1387913d2fdcSAlex Elder 1388139b4318SAlex Elder op = rbd_create_rw_op(CEPH_OSD_OP_READ, 0); 1389139b4318SAlex Elder if (!op) 1390913d2fdcSAlex Elder return -ENOMEM; 1391913d2fdcSAlex Elder 139225704ac9SAlex Elder ret = rbd_req_sync_op(rbd_dev, CEPH_OSD_FLAG_READ, 139330573d68SAlex Elder op, object_name, ofs, len, buf, NULL, ver); 1394139b4318SAlex Elder rbd_destroy_op(op); 1395913d2fdcSAlex Elder 1396913d2fdcSAlex Elder return ret; 1397602adf40SYehuda Sadeh } 1398602adf40SYehuda Sadeh 1399602adf40SYehuda Sadeh /* 140059c2be1eSYehuda Sadeh * Request sync osd watch 140159c2be1eSYehuda Sadeh */ 14020ce1a794SAlex Elder static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev, 140359c2be1eSYehuda Sadeh u64 ver, 14047f0a24d8SAlex Elder u64 notify_id) 140559c2be1eSYehuda Sadeh { 1406139b4318SAlex Elder struct ceph_osd_req_op *op; 140711f77002SSage Weil int ret; 140811f77002SSage Weil 1409139b4318SAlex Elder op = rbd_create_rw_op(CEPH_OSD_OP_NOTIFY_ACK, 0); 1410139b4318SAlex Elder if (!op) 141157cfc106SAlex Elder return -ENOMEM; 141259c2be1eSYehuda Sadeh 1413139b4318SAlex Elder op->watch.ver = cpu_to_le64(ver); 1414139b4318SAlex Elder op->watch.cookie = notify_id; 1415139b4318SAlex Elder op->watch.flag = 0; 141659c2be1eSYehuda Sadeh 14170ce1a794SAlex Elder ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP, 14187f0a24d8SAlex Elder rbd_dev->header_name, 0, 0, NULL, 1419ad4f232fSAlex Elder NULL, 0, 142059c2be1eSYehuda Sadeh CEPH_OSD_FLAG_READ, 142130573d68SAlex Elder op, 14221fec7093SYehuda Sadeh NULL, 0, 142359c2be1eSYehuda Sadeh rbd_simple_req_cb, 0, NULL); 142459c2be1eSYehuda Sadeh 1425139b4318SAlex Elder rbd_destroy_op(op); 142659c2be1eSYehuda Sadeh return ret; 142759c2be1eSYehuda Sadeh } 142859c2be1eSYehuda Sadeh 142959c2be1eSYehuda Sadeh static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data) 143059c2be1eSYehuda Sadeh { 14310ce1a794SAlex Elder struct rbd_device *rbd_dev = (struct rbd_device *)data; 1432a71b891bSJosh Durgin u64 hver; 143313143d2dSSage Weil int rc; 143413143d2dSSage Weil 14350ce1a794SAlex Elder if (!rbd_dev) 143659c2be1eSYehuda Sadeh return; 143759c2be1eSYehuda Sadeh 1438bd919d45SAlex Elder dout("rbd_watch_cb %s notify_id=%llu opcode=%u\n", 1439bd919d45SAlex Elder rbd_dev->header_name, (unsigned long long) notify_id, 1440bd919d45SAlex Elder (unsigned int) opcode); 1441117973fbSAlex Elder rc = rbd_dev_refresh(rbd_dev, &hver); 144213143d2dSSage Weil if (rc) 144306ecc6cbSAlex Elder rbd_warn(rbd_dev, "got notification but failed to " 144406ecc6cbSAlex Elder " update snaps: %d\n", rc); 144559c2be1eSYehuda Sadeh 14467f0a24d8SAlex Elder rbd_req_sync_notify_ack(rbd_dev, hver, notify_id); 144759c2be1eSYehuda Sadeh } 144859c2be1eSYehuda Sadeh 144959c2be1eSYehuda Sadeh /* 145059c2be1eSYehuda Sadeh * Request sync osd watch 145159c2be1eSYehuda Sadeh */ 14520e6f322dSAlex Elder static int rbd_req_sync_watch(struct rbd_device *rbd_dev) 145359c2be1eSYehuda Sadeh { 1454139b4318SAlex Elder struct ceph_osd_req_op *op; 14550ce1a794SAlex Elder struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc; 145657cfc106SAlex Elder int ret; 145759c2be1eSYehuda Sadeh 1458139b4318SAlex Elder op = rbd_create_rw_op(CEPH_OSD_OP_WATCH, 0); 1459139b4318SAlex Elder if (!op) 146057cfc106SAlex Elder return -ENOMEM; 146159c2be1eSYehuda Sadeh 146259c2be1eSYehuda Sadeh ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, 14630ce1a794SAlex Elder (void *)rbd_dev, &rbd_dev->watch_event); 146459c2be1eSYehuda Sadeh if (ret < 0) 146559c2be1eSYehuda Sadeh goto fail; 146659c2be1eSYehuda Sadeh 1467139b4318SAlex Elder op->watch.ver = cpu_to_le64(rbd_dev->header.obj_version); 1468139b4318SAlex Elder op->watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); 1469139b4318SAlex Elder op->watch.flag = 1; 147059c2be1eSYehuda Sadeh 147125704ac9SAlex Elder ret = rbd_req_sync_op(rbd_dev, 147259c2be1eSYehuda Sadeh CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, 147330573d68SAlex Elder op, 14740e6f322dSAlex Elder rbd_dev->header_name, 14750e6f322dSAlex Elder 0, 0, NULL, 14760ce1a794SAlex Elder &rbd_dev->watch_request, NULL); 147759c2be1eSYehuda Sadeh 147859c2be1eSYehuda Sadeh if (ret < 0) 147959c2be1eSYehuda Sadeh goto fail_event; 148059c2be1eSYehuda Sadeh 1481139b4318SAlex Elder rbd_destroy_op(op); 148259c2be1eSYehuda Sadeh return 0; 148359c2be1eSYehuda Sadeh 148459c2be1eSYehuda Sadeh fail_event: 14850ce1a794SAlex Elder ceph_osdc_cancel_event(rbd_dev->watch_event); 14860ce1a794SAlex Elder rbd_dev->watch_event = NULL; 148759c2be1eSYehuda Sadeh fail: 1488139b4318SAlex Elder rbd_destroy_op(op); 148959c2be1eSYehuda Sadeh return ret; 149059c2be1eSYehuda Sadeh } 149159c2be1eSYehuda Sadeh 149279e3057cSYehuda Sadeh /* 149379e3057cSYehuda Sadeh * Request sync osd unwatch 149479e3057cSYehuda Sadeh */ 1495070c633fSAlex Elder static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev) 149679e3057cSYehuda Sadeh { 1497139b4318SAlex Elder struct ceph_osd_req_op *op; 149857cfc106SAlex Elder int ret; 149979e3057cSYehuda Sadeh 1500139b4318SAlex Elder op = rbd_create_rw_op(CEPH_OSD_OP_WATCH, 0); 1501139b4318SAlex Elder if (!op) 150257cfc106SAlex Elder return -ENOMEM; 150379e3057cSYehuda Sadeh 1504139b4318SAlex Elder op->watch.ver = 0; 1505139b4318SAlex Elder op->watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie); 1506139b4318SAlex Elder op->watch.flag = 0; 150779e3057cSYehuda Sadeh 150825704ac9SAlex Elder ret = rbd_req_sync_op(rbd_dev, 150979e3057cSYehuda Sadeh CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK, 151030573d68SAlex Elder op, 1511070c633fSAlex Elder rbd_dev->header_name, 1512070c633fSAlex Elder 0, 0, NULL, NULL, NULL); 1513070c633fSAlex Elder 151479e3057cSYehuda Sadeh 1515139b4318SAlex Elder rbd_destroy_op(op); 15160ce1a794SAlex Elder ceph_osdc_cancel_event(rbd_dev->watch_event); 15170ce1a794SAlex Elder rbd_dev->watch_event = NULL; 151879e3057cSYehuda Sadeh return ret; 151979e3057cSYehuda Sadeh } 152079e3057cSYehuda Sadeh 152159c2be1eSYehuda Sadeh /* 15223cb4a687SAlex Elder * Synchronous osd object method call 1523602adf40SYehuda Sadeh */ 15240ce1a794SAlex Elder static int rbd_req_sync_exec(struct rbd_device *rbd_dev, 1525aded07eaSAlex Elder const char *object_name, 1526aded07eaSAlex Elder const char *class_name, 1527aded07eaSAlex Elder const char *method_name, 15283cb4a687SAlex Elder const char *outbound, 15293cb4a687SAlex Elder size_t outbound_size, 1530f8d4de6eSAlex Elder char *inbound, 1531f8d4de6eSAlex Elder size_t inbound_size, 153259c2be1eSYehuda Sadeh u64 *ver) 1533602adf40SYehuda Sadeh { 1534139b4318SAlex Elder struct ceph_osd_req_op *op; 1535aded07eaSAlex Elder int class_name_len = strlen(class_name); 1536aded07eaSAlex Elder int method_name_len = strlen(method_name); 15373cb4a687SAlex Elder int payload_size; 153857cfc106SAlex Elder int ret; 153957cfc106SAlex Elder 15403cb4a687SAlex Elder /* 15413cb4a687SAlex Elder * Any input parameters required by the method we're calling 15423cb4a687SAlex Elder * will be sent along with the class and method names as 15433cb4a687SAlex Elder * part of the message payload. That data and its size are 15443cb4a687SAlex Elder * supplied via the indata and indata_len fields (named from 15453cb4a687SAlex Elder * the perspective of the server side) in the OSD request 15463cb4a687SAlex Elder * operation. 15473cb4a687SAlex Elder */ 15483cb4a687SAlex Elder payload_size = class_name_len + method_name_len + outbound_size; 1549139b4318SAlex Elder op = rbd_create_rw_op(CEPH_OSD_OP_CALL, payload_size); 1550139b4318SAlex Elder if (!op) 155157cfc106SAlex Elder return -ENOMEM; 1552602adf40SYehuda Sadeh 1553139b4318SAlex Elder op->cls.class_name = class_name; 1554139b4318SAlex Elder op->cls.class_len = (__u8) class_name_len; 1555139b4318SAlex Elder op->cls.method_name = method_name; 1556139b4318SAlex Elder op->cls.method_len = (__u8) method_name_len; 1557139b4318SAlex Elder op->cls.argc = 0; 1558139b4318SAlex Elder op->cls.indata = outbound; 1559139b4318SAlex Elder op->cls.indata_len = outbound_size; 1560602adf40SYehuda Sadeh 156130573d68SAlex Elder ret = rbd_req_sync_op(rbd_dev, CEPH_OSD_FLAG_READ, op, 1562f8d4de6eSAlex Elder object_name, 0, inbound_size, inbound, 1563f8d4de6eSAlex Elder NULL, ver); 1564602adf40SYehuda Sadeh 1565139b4318SAlex Elder rbd_destroy_op(op); 1566602adf40SYehuda Sadeh 1567602adf40SYehuda Sadeh dout("cls_exec returned %d\n", ret); 1568602adf40SYehuda Sadeh return ret; 1569602adf40SYehuda Sadeh } 1570602adf40SYehuda Sadeh 15711fec7093SYehuda Sadeh static struct rbd_req_coll *rbd_alloc_coll(int num_reqs) 15721fec7093SYehuda Sadeh { 15731fec7093SYehuda Sadeh struct rbd_req_coll *coll = 15741fec7093SYehuda Sadeh kzalloc(sizeof(struct rbd_req_coll) + 15751fec7093SYehuda Sadeh sizeof(struct rbd_req_status) * num_reqs, 15761fec7093SYehuda Sadeh GFP_ATOMIC); 15771fec7093SYehuda Sadeh 15781fec7093SYehuda Sadeh if (!coll) 15791fec7093SYehuda Sadeh return NULL; 15801fec7093SYehuda Sadeh coll->total = num_reqs; 15811fec7093SYehuda Sadeh kref_init(&coll->kref); 15821fec7093SYehuda Sadeh return coll; 15831fec7093SYehuda Sadeh } 15841fec7093SYehuda Sadeh 15858295cda7SAlex Elder static int rbd_dev_do_request(struct request *rq, 15868295cda7SAlex Elder struct rbd_device *rbd_dev, 15878295cda7SAlex Elder struct ceph_snap_context *snapc, 15888295cda7SAlex Elder u64 ofs, unsigned int size, 15898295cda7SAlex Elder struct bio *bio_chain) 15908295cda7SAlex Elder { 15918295cda7SAlex Elder int num_segs; 15928295cda7SAlex Elder struct rbd_req_coll *coll; 15938295cda7SAlex Elder unsigned int bio_offset; 15948295cda7SAlex Elder int cur_seg = 0; 15958295cda7SAlex Elder 15968295cda7SAlex Elder dout("%s 0x%x bytes at 0x%llx\n", 15978295cda7SAlex Elder rq_data_dir(rq) == WRITE ? "write" : "read", 15988295cda7SAlex Elder size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE); 15998295cda7SAlex Elder 16008295cda7SAlex Elder num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size); 16018295cda7SAlex Elder if (num_segs <= 0) 16028295cda7SAlex Elder return num_segs; 16038295cda7SAlex Elder 16048295cda7SAlex Elder coll = rbd_alloc_coll(num_segs); 16058295cda7SAlex Elder if (!coll) 16068295cda7SAlex Elder return -ENOMEM; 16078295cda7SAlex Elder 16088295cda7SAlex Elder bio_offset = 0; 16098295cda7SAlex Elder do { 16108295cda7SAlex Elder u64 limit = rbd_segment_length(rbd_dev, ofs, size); 16118295cda7SAlex Elder unsigned int clone_size; 16128295cda7SAlex Elder struct bio *bio_clone; 16138295cda7SAlex Elder 16148295cda7SAlex Elder BUG_ON(limit > (u64)UINT_MAX); 16158295cda7SAlex Elder clone_size = (unsigned int)limit; 16168295cda7SAlex Elder dout("bio_chain->bi_vcnt=%hu\n", bio_chain->bi_vcnt); 16178295cda7SAlex Elder 16188295cda7SAlex Elder kref_get(&coll->kref); 16198295cda7SAlex Elder 16208295cda7SAlex Elder /* Pass a cloned bio chain via an osd request */ 16218295cda7SAlex Elder 16228295cda7SAlex Elder bio_clone = bio_chain_clone_range(&bio_chain, 16238295cda7SAlex Elder &bio_offset, clone_size, 16248295cda7SAlex Elder GFP_ATOMIC); 16258295cda7SAlex Elder if (bio_clone) 16268295cda7SAlex Elder (void)rbd_do_op(rq, rbd_dev, snapc, 16278295cda7SAlex Elder ofs, clone_size, 16288295cda7SAlex Elder bio_clone, coll, cur_seg); 16298295cda7SAlex Elder else 16308295cda7SAlex Elder rbd_coll_end_req_index(rq, coll, cur_seg, 16318295cda7SAlex Elder (s32)-ENOMEM, 16328295cda7SAlex Elder clone_size); 16338295cda7SAlex Elder size -= clone_size; 16348295cda7SAlex Elder ofs += clone_size; 16358295cda7SAlex Elder 16368295cda7SAlex Elder cur_seg++; 16378295cda7SAlex Elder } while (size > 0); 16388295cda7SAlex Elder kref_put(&coll->kref, rbd_coll_release); 16398295cda7SAlex Elder 16408295cda7SAlex Elder return 0; 16418295cda7SAlex Elder } 16428295cda7SAlex Elder 1643602adf40SYehuda Sadeh /* 1644602adf40SYehuda Sadeh * block device queue callback 1645602adf40SYehuda Sadeh */ 1646602adf40SYehuda Sadeh static void rbd_rq_fn(struct request_queue *q) 1647602adf40SYehuda Sadeh { 1648602adf40SYehuda Sadeh struct rbd_device *rbd_dev = q->queuedata; 1649b395e8b5SAlex Elder bool read_only = rbd_dev->mapping.read_only; 1650602adf40SYehuda Sadeh struct request *rq; 1651602adf40SYehuda Sadeh 165200f1f36fSAlex Elder while ((rq = blk_fetch_request(q))) { 1653b395e8b5SAlex Elder struct ceph_snap_context *snapc = NULL; 1654b395e8b5SAlex Elder unsigned int size = 0; 16558295cda7SAlex Elder int result; 1656602adf40SYehuda Sadeh 1657602adf40SYehuda Sadeh dout("fetched request\n"); 1658602adf40SYehuda Sadeh 1659b395e8b5SAlex Elder /* Filter out block requests we don't understand */ 1660b395e8b5SAlex Elder 1661602adf40SYehuda Sadeh if ((rq->cmd_type != REQ_TYPE_FS)) { 1662602adf40SYehuda Sadeh __blk_end_request_all(rq, 0); 166300f1f36fSAlex Elder continue; 1664602adf40SYehuda Sadeh } 1665602adf40SYehuda Sadeh spin_unlock_irq(q->queue_lock); 1666602adf40SYehuda Sadeh 1667a7b4c65fSAlex Elder /* Write requests need a reference to the snapshot context */ 1668e88a36ecSJosh Durgin 1669a7b4c65fSAlex Elder if (rq_data_dir(rq) == WRITE) { 1670b395e8b5SAlex Elder result = -EROFS; 1671a7b4c65fSAlex Elder if (read_only) /* Can't write to a read-only device */ 1672b395e8b5SAlex Elder goto out_end_request; 1673b395e8b5SAlex Elder 1674a7b4c65fSAlex Elder /* 1675a7b4c65fSAlex Elder * Note that each osd request will take its 1676a7b4c65fSAlex Elder * own reference to the snapshot context 1677a7b4c65fSAlex Elder * supplied. The reference we take here 1678a7b4c65fSAlex Elder * just guarantees the one we provide stays 1679a7b4c65fSAlex Elder * valid. 1680a7b4c65fSAlex Elder */ 1681b395e8b5SAlex Elder down_read(&rbd_dev->header_rwsem); 1682b395e8b5SAlex Elder snapc = ceph_get_snap_context(rbd_dev->header.snapc); 1683d1d25646SJosh Durgin up_read(&rbd_dev->header_rwsem); 1684a7b4c65fSAlex Elder rbd_assert(snapc != NULL); 1685a7b4c65fSAlex Elder } else if (!atomic_read(&rbd_dev->exists)) { 1686b395e8b5SAlex Elder rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP); 1687e88a36ecSJosh Durgin dout("request for non-existent snapshot"); 1688b395e8b5SAlex Elder result = -ENXIO; 1689b395e8b5SAlex Elder goto out_end_request; 1690e88a36ecSJosh Durgin } 1691d1d25646SJosh Durgin 1692f7760dadSAlex Elder size = blk_rq_bytes(rq); 1693b395e8b5SAlex Elder result = rbd_dev_do_request(rq, rbd_dev, snapc, 1694b395e8b5SAlex Elder blk_rq_pos(rq) * SECTOR_SIZE, 1695b395e8b5SAlex Elder size, rq->bio); 1696b395e8b5SAlex Elder out_end_request: 1697a7b4c65fSAlex Elder if (snapc) 1698df111be6SAlex Elder ceph_put_snap_context(snapc); 16991fec7093SYehuda Sadeh spin_lock_irq(q->queue_lock); 17008295cda7SAlex Elder if (!size || result < 0) 17018295cda7SAlex Elder __blk_end_request_all(rq, result); 1702602adf40SYehuda Sadeh } 1703602adf40SYehuda Sadeh } 1704602adf40SYehuda Sadeh 1705602adf40SYehuda Sadeh /* 1706602adf40SYehuda Sadeh * a queue callback. Makes sure that we don't create a bio that spans across 1707602adf40SYehuda Sadeh * multiple osd objects. One exception would be with a single page bios, 1708f7760dadSAlex Elder * which we handle later at bio_chain_clone_range() 1709602adf40SYehuda Sadeh */ 1710602adf40SYehuda Sadeh static int rbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bmd, 1711602adf40SYehuda Sadeh struct bio_vec *bvec) 1712602adf40SYehuda Sadeh { 1713602adf40SYehuda Sadeh struct rbd_device *rbd_dev = q->queuedata; 1714e5cfeed2SAlex Elder sector_t sector_offset; 1715e5cfeed2SAlex Elder sector_t sectors_per_obj; 1716e5cfeed2SAlex Elder sector_t obj_sector_offset; 1717e5cfeed2SAlex Elder int ret; 1718602adf40SYehuda Sadeh 1719e5cfeed2SAlex Elder /* 1720e5cfeed2SAlex Elder * Find how far into its rbd object the partition-relative 1721e5cfeed2SAlex Elder * bio start sector is to offset relative to the enclosing 1722e5cfeed2SAlex Elder * device. 1723e5cfeed2SAlex Elder */ 1724e5cfeed2SAlex Elder sector_offset = get_start_sect(bmd->bi_bdev) + bmd->bi_sector; 1725e5cfeed2SAlex Elder sectors_per_obj = 1 << (rbd_dev->header.obj_order - SECTOR_SHIFT); 1726e5cfeed2SAlex Elder obj_sector_offset = sector_offset & (sectors_per_obj - 1); 1727593a9e7bSAlex Elder 1728e5cfeed2SAlex Elder /* 1729e5cfeed2SAlex Elder * Compute the number of bytes from that offset to the end 1730e5cfeed2SAlex Elder * of the object. Account for what's already used by the bio. 1731e5cfeed2SAlex Elder */ 1732e5cfeed2SAlex Elder ret = (int) (sectors_per_obj - obj_sector_offset) << SECTOR_SHIFT; 1733e5cfeed2SAlex Elder if (ret > bmd->bi_size) 1734e5cfeed2SAlex Elder ret -= bmd->bi_size; 1735e5cfeed2SAlex Elder else 1736e5cfeed2SAlex Elder ret = 0; 1737e5cfeed2SAlex Elder 1738e5cfeed2SAlex Elder /* 1739e5cfeed2SAlex Elder * Don't send back more than was asked for. And if the bio 1740e5cfeed2SAlex Elder * was empty, let the whole thing through because: "Note 1741e5cfeed2SAlex Elder * that a block device *must* allow a single page to be 1742e5cfeed2SAlex Elder * added to an empty bio." 1743e5cfeed2SAlex Elder */ 1744e5cfeed2SAlex Elder rbd_assert(bvec->bv_len <= PAGE_SIZE); 1745e5cfeed2SAlex Elder if (ret > (int) bvec->bv_len || !bmd->bi_size) 1746e5cfeed2SAlex Elder ret = (int) bvec->bv_len; 1747e5cfeed2SAlex Elder 1748e5cfeed2SAlex Elder return ret; 1749602adf40SYehuda Sadeh } 1750602adf40SYehuda Sadeh 1751602adf40SYehuda Sadeh static void rbd_free_disk(struct rbd_device *rbd_dev) 1752602adf40SYehuda Sadeh { 1753602adf40SYehuda Sadeh struct gendisk *disk = rbd_dev->disk; 1754602adf40SYehuda Sadeh 1755602adf40SYehuda Sadeh if (!disk) 1756602adf40SYehuda Sadeh return; 1757602adf40SYehuda Sadeh 1758602adf40SYehuda Sadeh if (disk->flags & GENHD_FL_UP) 1759602adf40SYehuda Sadeh del_gendisk(disk); 1760602adf40SYehuda Sadeh if (disk->queue) 1761602adf40SYehuda Sadeh blk_cleanup_queue(disk->queue); 1762602adf40SYehuda Sadeh put_disk(disk); 1763602adf40SYehuda Sadeh } 1764602adf40SYehuda Sadeh 1765602adf40SYehuda Sadeh /* 17664156d998SAlex Elder * Read the complete header for the given rbd device. 17674156d998SAlex Elder * 17684156d998SAlex Elder * Returns a pointer to a dynamically-allocated buffer containing 17694156d998SAlex Elder * the complete and validated header. Caller can pass the address 17704156d998SAlex Elder * of a variable that will be filled in with the version of the 17714156d998SAlex Elder * header object at the time it was read. 17724156d998SAlex Elder * 17734156d998SAlex Elder * Returns a pointer-coded errno if a failure occurs. 17744156d998SAlex Elder */ 17754156d998SAlex Elder static struct rbd_image_header_ondisk * 17764156d998SAlex Elder rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version) 17774156d998SAlex Elder { 17784156d998SAlex Elder struct rbd_image_header_ondisk *ondisk = NULL; 17794156d998SAlex Elder u32 snap_count = 0; 17804156d998SAlex Elder u64 names_size = 0; 17814156d998SAlex Elder u32 want_count; 17824156d998SAlex Elder int ret; 17834156d998SAlex Elder 17844156d998SAlex Elder /* 17854156d998SAlex Elder * The complete header will include an array of its 64-bit 17864156d998SAlex Elder * snapshot ids, followed by the names of those snapshots as 17874156d998SAlex Elder * a contiguous block of NUL-terminated strings. Note that 17884156d998SAlex Elder * the number of snapshots could change by the time we read 17894156d998SAlex Elder * it in, in which case we re-read it. 17904156d998SAlex Elder */ 17914156d998SAlex Elder do { 17924156d998SAlex Elder size_t size; 17934156d998SAlex Elder 17944156d998SAlex Elder kfree(ondisk); 17954156d998SAlex Elder 17964156d998SAlex Elder size = sizeof (*ondisk); 17974156d998SAlex Elder size += snap_count * sizeof (struct rbd_image_snap_ondisk); 17984156d998SAlex Elder size += names_size; 17994156d998SAlex Elder ondisk = kmalloc(size, GFP_KERNEL); 18004156d998SAlex Elder if (!ondisk) 18014156d998SAlex Elder return ERR_PTR(-ENOMEM); 18024156d998SAlex Elder 18034775618dSAlex Elder ret = rbd_req_sync_read(rbd_dev, rbd_dev->header_name, 18044156d998SAlex Elder 0, size, 18054156d998SAlex Elder (char *) ondisk, version); 18064156d998SAlex Elder 18074156d998SAlex Elder if (ret < 0) 18084156d998SAlex Elder goto out_err; 18094156d998SAlex Elder if (WARN_ON((size_t) ret < size)) { 18104156d998SAlex Elder ret = -ENXIO; 181106ecc6cbSAlex Elder rbd_warn(rbd_dev, "short header read (want %zd got %d)", 181206ecc6cbSAlex Elder size, ret); 18134156d998SAlex Elder goto out_err; 18144156d998SAlex Elder } 18154156d998SAlex Elder if (!rbd_dev_ondisk_valid(ondisk)) { 18164156d998SAlex Elder ret = -ENXIO; 181706ecc6cbSAlex Elder rbd_warn(rbd_dev, "invalid header"); 18184156d998SAlex Elder goto out_err; 18194156d998SAlex Elder } 18204156d998SAlex Elder 18214156d998SAlex Elder names_size = le64_to_cpu(ondisk->snap_names_len); 18224156d998SAlex Elder want_count = snap_count; 18234156d998SAlex Elder snap_count = le32_to_cpu(ondisk->snap_count); 18244156d998SAlex Elder } while (snap_count != want_count); 18254156d998SAlex Elder 18264156d998SAlex Elder return ondisk; 18274156d998SAlex Elder 18284156d998SAlex Elder out_err: 18294156d998SAlex Elder kfree(ondisk); 18304156d998SAlex Elder 18314156d998SAlex Elder return ERR_PTR(ret); 18324156d998SAlex Elder } 18334156d998SAlex Elder 18344156d998SAlex Elder /* 1835602adf40SYehuda Sadeh * reload the ondisk the header 1836602adf40SYehuda Sadeh */ 1837602adf40SYehuda Sadeh static int rbd_read_header(struct rbd_device *rbd_dev, 1838602adf40SYehuda Sadeh struct rbd_image_header *header) 1839602adf40SYehuda Sadeh { 18404156d998SAlex Elder struct rbd_image_header_ondisk *ondisk; 18414156d998SAlex Elder u64 ver = 0; 18424156d998SAlex Elder int ret; 1843602adf40SYehuda Sadeh 18444156d998SAlex Elder ondisk = rbd_dev_v1_header_read(rbd_dev, &ver); 18454156d998SAlex Elder if (IS_ERR(ondisk)) 18464156d998SAlex Elder return PTR_ERR(ondisk); 18474156d998SAlex Elder ret = rbd_header_from_disk(header, ondisk); 18484156d998SAlex Elder if (ret >= 0) 184959c2be1eSYehuda Sadeh header->obj_version = ver; 18504156d998SAlex Elder kfree(ondisk); 1851602adf40SYehuda Sadeh 18524156d998SAlex Elder return ret; 1853602adf40SYehuda Sadeh } 1854602adf40SYehuda Sadeh 185541f38c2bSAlex Elder static void rbd_remove_all_snaps(struct rbd_device *rbd_dev) 1856dfc5606dSYehuda Sadeh { 1857dfc5606dSYehuda Sadeh struct rbd_snap *snap; 1858a0593290SAlex Elder struct rbd_snap *next; 1859dfc5606dSYehuda Sadeh 1860a0593290SAlex Elder list_for_each_entry_safe(snap, next, &rbd_dev->snaps, node) 186141f38c2bSAlex Elder rbd_remove_snap_dev(snap); 1862dfc5606dSYehuda Sadeh } 1863dfc5606dSYehuda Sadeh 18649478554aSAlex Elder static void rbd_update_mapping_size(struct rbd_device *rbd_dev) 18659478554aSAlex Elder { 18669478554aSAlex Elder sector_t size; 18679478554aSAlex Elder 18680d7dbfceSAlex Elder if (rbd_dev->spec->snap_id != CEPH_NOSNAP) 18699478554aSAlex Elder return; 18709478554aSAlex Elder 18719478554aSAlex Elder size = (sector_t) rbd_dev->header.image_size / SECTOR_SIZE; 18729478554aSAlex Elder dout("setting size to %llu sectors", (unsigned long long) size); 18739478554aSAlex Elder rbd_dev->mapping.size = (u64) size; 18749478554aSAlex Elder set_capacity(rbd_dev->disk, size); 18759478554aSAlex Elder } 18769478554aSAlex Elder 1877602adf40SYehuda Sadeh /* 1878602adf40SYehuda Sadeh * only read the first part of the ondisk header, without the snaps info 1879602adf40SYehuda Sadeh */ 1880117973fbSAlex Elder static int rbd_dev_v1_refresh(struct rbd_device *rbd_dev, u64 *hver) 1881602adf40SYehuda Sadeh { 1882602adf40SYehuda Sadeh int ret; 1883602adf40SYehuda Sadeh struct rbd_image_header h; 1884602adf40SYehuda Sadeh 1885602adf40SYehuda Sadeh ret = rbd_read_header(rbd_dev, &h); 1886602adf40SYehuda Sadeh if (ret < 0) 1887602adf40SYehuda Sadeh return ret; 1888602adf40SYehuda Sadeh 1889a51aa0c0SJosh Durgin down_write(&rbd_dev->header_rwsem); 1890a51aa0c0SJosh Durgin 18919478554aSAlex Elder /* Update image size, and check for resize of mapped image */ 18929478554aSAlex Elder rbd_dev->header.image_size = h.image_size; 18939478554aSAlex Elder rbd_update_mapping_size(rbd_dev); 18949db4b3e3SSage Weil 1895849b4260SAlex Elder /* rbd_dev->header.object_prefix shouldn't change */ 1896602adf40SYehuda Sadeh kfree(rbd_dev->header.snap_sizes); 1897849b4260SAlex Elder kfree(rbd_dev->header.snap_names); 1898d1d25646SJosh Durgin /* osd requests may still refer to snapc */ 1899d1d25646SJosh Durgin ceph_put_snap_context(rbd_dev->header.snapc); 1900602adf40SYehuda Sadeh 1901b813623aSAlex Elder if (hver) 1902b813623aSAlex Elder *hver = h.obj_version; 1903a71b891bSJosh Durgin rbd_dev->header.obj_version = h.obj_version; 190493a24e08SJosh Durgin rbd_dev->header.image_size = h.image_size; 1905602adf40SYehuda Sadeh rbd_dev->header.snapc = h.snapc; 1906602adf40SYehuda Sadeh rbd_dev->header.snap_names = h.snap_names; 1907602adf40SYehuda Sadeh rbd_dev->header.snap_sizes = h.snap_sizes; 1908849b4260SAlex Elder /* Free the extra copy of the object prefix */ 1909849b4260SAlex Elder WARN_ON(strcmp(rbd_dev->header.object_prefix, h.object_prefix)); 1910849b4260SAlex Elder kfree(h.object_prefix); 1911849b4260SAlex Elder 1912304f6808SAlex Elder ret = rbd_dev_snaps_update(rbd_dev); 1913304f6808SAlex Elder if (!ret) 1914304f6808SAlex Elder ret = rbd_dev_snaps_register(rbd_dev); 1915dfc5606dSYehuda Sadeh 1916c666601aSJosh Durgin up_write(&rbd_dev->header_rwsem); 1917602adf40SYehuda Sadeh 1918dfc5606dSYehuda Sadeh return ret; 1919602adf40SYehuda Sadeh } 1920602adf40SYehuda Sadeh 1921117973fbSAlex Elder static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver) 19221fe5e993SAlex Elder { 19231fe5e993SAlex Elder int ret; 19241fe5e993SAlex Elder 1925117973fbSAlex Elder rbd_assert(rbd_image_format_valid(rbd_dev->image_format)); 19261fe5e993SAlex Elder mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 1927117973fbSAlex Elder if (rbd_dev->image_format == 1) 1928117973fbSAlex Elder ret = rbd_dev_v1_refresh(rbd_dev, hver); 1929117973fbSAlex Elder else 1930117973fbSAlex Elder ret = rbd_dev_v2_refresh(rbd_dev, hver); 19311fe5e993SAlex Elder mutex_unlock(&ctl_mutex); 19321fe5e993SAlex Elder 19331fe5e993SAlex Elder return ret; 19341fe5e993SAlex Elder } 19351fe5e993SAlex Elder 1936602adf40SYehuda Sadeh static int rbd_init_disk(struct rbd_device *rbd_dev) 1937602adf40SYehuda Sadeh { 1938602adf40SYehuda Sadeh struct gendisk *disk; 1939602adf40SYehuda Sadeh struct request_queue *q; 1940593a9e7bSAlex Elder u64 segment_size; 1941602adf40SYehuda Sadeh 1942602adf40SYehuda Sadeh /* create gendisk info */ 1943602adf40SYehuda Sadeh disk = alloc_disk(RBD_MINORS_PER_MAJOR); 1944602adf40SYehuda Sadeh if (!disk) 19451fcdb8aaSAlex Elder return -ENOMEM; 1946602adf40SYehuda Sadeh 1947f0f8cef5SAlex Elder snprintf(disk->disk_name, sizeof(disk->disk_name), RBD_DRV_NAME "%d", 1948de71a297SAlex Elder rbd_dev->dev_id); 1949602adf40SYehuda Sadeh disk->major = rbd_dev->major; 1950602adf40SYehuda Sadeh disk->first_minor = 0; 1951602adf40SYehuda Sadeh disk->fops = &rbd_bd_ops; 1952602adf40SYehuda Sadeh disk->private_data = rbd_dev; 1953602adf40SYehuda Sadeh 1954602adf40SYehuda Sadeh /* init rq */ 1955602adf40SYehuda Sadeh q = blk_init_queue(rbd_rq_fn, &rbd_dev->lock); 1956602adf40SYehuda Sadeh if (!q) 1957602adf40SYehuda Sadeh goto out_disk; 1958029bcbd8SJosh Durgin 1959593a9e7bSAlex Elder /* We use the default size, but let's be explicit about it. */ 1960593a9e7bSAlex Elder blk_queue_physical_block_size(q, SECTOR_SIZE); 1961593a9e7bSAlex Elder 1962029bcbd8SJosh Durgin /* set io sizes to object size */ 1963593a9e7bSAlex Elder segment_size = rbd_obj_bytes(&rbd_dev->header); 1964593a9e7bSAlex Elder blk_queue_max_hw_sectors(q, segment_size / SECTOR_SIZE); 1965593a9e7bSAlex Elder blk_queue_max_segment_size(q, segment_size); 1966593a9e7bSAlex Elder blk_queue_io_min(q, segment_size); 1967593a9e7bSAlex Elder blk_queue_io_opt(q, segment_size); 1968029bcbd8SJosh Durgin 1969602adf40SYehuda Sadeh blk_queue_merge_bvec(q, rbd_merge_bvec); 1970602adf40SYehuda Sadeh disk->queue = q; 1971602adf40SYehuda Sadeh 1972602adf40SYehuda Sadeh q->queuedata = rbd_dev; 1973602adf40SYehuda Sadeh 1974602adf40SYehuda Sadeh rbd_dev->disk = disk; 1975602adf40SYehuda Sadeh 197612f02944SAlex Elder set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE); 197712f02944SAlex Elder 1978602adf40SYehuda Sadeh return 0; 1979602adf40SYehuda Sadeh out_disk: 1980602adf40SYehuda Sadeh put_disk(disk); 19811fcdb8aaSAlex Elder 19821fcdb8aaSAlex Elder return -ENOMEM; 1983602adf40SYehuda Sadeh } 1984602adf40SYehuda Sadeh 1985dfc5606dSYehuda Sadeh /* 1986dfc5606dSYehuda Sadeh sysfs 1987dfc5606dSYehuda Sadeh */ 1988602adf40SYehuda Sadeh 1989593a9e7bSAlex Elder static struct rbd_device *dev_to_rbd_dev(struct device *dev) 1990593a9e7bSAlex Elder { 1991593a9e7bSAlex Elder return container_of(dev, struct rbd_device, dev); 1992593a9e7bSAlex Elder } 1993593a9e7bSAlex Elder 1994dfc5606dSYehuda Sadeh static ssize_t rbd_size_show(struct device *dev, 1995dfc5606dSYehuda Sadeh struct device_attribute *attr, char *buf) 1996602adf40SYehuda Sadeh { 1997593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 1998a51aa0c0SJosh Durgin sector_t size; 1999dfc5606dSYehuda Sadeh 2000a51aa0c0SJosh Durgin down_read(&rbd_dev->header_rwsem); 2001a51aa0c0SJosh Durgin size = get_capacity(rbd_dev->disk); 2002a51aa0c0SJosh Durgin up_read(&rbd_dev->header_rwsem); 2003a51aa0c0SJosh Durgin 2004a51aa0c0SJosh Durgin return sprintf(buf, "%llu\n", (unsigned long long) size * SECTOR_SIZE); 2005602adf40SYehuda Sadeh } 2006602adf40SYehuda Sadeh 200734b13184SAlex Elder /* 200834b13184SAlex Elder * Note this shows the features for whatever's mapped, which is not 200934b13184SAlex Elder * necessarily the base image. 201034b13184SAlex Elder */ 201134b13184SAlex Elder static ssize_t rbd_features_show(struct device *dev, 201234b13184SAlex Elder struct device_attribute *attr, char *buf) 201334b13184SAlex Elder { 201434b13184SAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 201534b13184SAlex Elder 201634b13184SAlex Elder return sprintf(buf, "0x%016llx\n", 201734b13184SAlex Elder (unsigned long long) rbd_dev->mapping.features); 201834b13184SAlex Elder } 201934b13184SAlex Elder 2020dfc5606dSYehuda Sadeh static ssize_t rbd_major_show(struct device *dev, 2021dfc5606dSYehuda Sadeh struct device_attribute *attr, char *buf) 2022602adf40SYehuda Sadeh { 2023593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2024dfc5606dSYehuda Sadeh 2025dfc5606dSYehuda Sadeh return sprintf(buf, "%d\n", rbd_dev->major); 2026dfc5606dSYehuda Sadeh } 2027dfc5606dSYehuda Sadeh 2028dfc5606dSYehuda Sadeh static ssize_t rbd_client_id_show(struct device *dev, 2029dfc5606dSYehuda Sadeh struct device_attribute *attr, char *buf) 2030dfc5606dSYehuda Sadeh { 2031593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2032dfc5606dSYehuda Sadeh 20331dbb4399SAlex Elder return sprintf(buf, "client%lld\n", 20341dbb4399SAlex Elder ceph_client_id(rbd_dev->rbd_client->client)); 2035dfc5606dSYehuda Sadeh } 2036dfc5606dSYehuda Sadeh 2037dfc5606dSYehuda Sadeh static ssize_t rbd_pool_show(struct device *dev, 2038dfc5606dSYehuda Sadeh struct device_attribute *attr, char *buf) 2039dfc5606dSYehuda Sadeh { 2040593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2041dfc5606dSYehuda Sadeh 20420d7dbfceSAlex Elder return sprintf(buf, "%s\n", rbd_dev->spec->pool_name); 2043dfc5606dSYehuda Sadeh } 2044dfc5606dSYehuda Sadeh 20459bb2f334SAlex Elder static ssize_t rbd_pool_id_show(struct device *dev, 20469bb2f334SAlex Elder struct device_attribute *attr, char *buf) 20479bb2f334SAlex Elder { 20489bb2f334SAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 20499bb2f334SAlex Elder 20500d7dbfceSAlex Elder return sprintf(buf, "%llu\n", 20510d7dbfceSAlex Elder (unsigned long long) rbd_dev->spec->pool_id); 20529bb2f334SAlex Elder } 20539bb2f334SAlex Elder 2054dfc5606dSYehuda Sadeh static ssize_t rbd_name_show(struct device *dev, 2055dfc5606dSYehuda Sadeh struct device_attribute *attr, char *buf) 2056dfc5606dSYehuda Sadeh { 2057593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2058dfc5606dSYehuda Sadeh 2059a92ffdf8SAlex Elder if (rbd_dev->spec->image_name) 20600d7dbfceSAlex Elder return sprintf(buf, "%s\n", rbd_dev->spec->image_name); 2061a92ffdf8SAlex Elder 2062a92ffdf8SAlex Elder return sprintf(buf, "(unknown)\n"); 2063dfc5606dSYehuda Sadeh } 2064dfc5606dSYehuda Sadeh 2065589d30e0SAlex Elder static ssize_t rbd_image_id_show(struct device *dev, 2066589d30e0SAlex Elder struct device_attribute *attr, char *buf) 2067589d30e0SAlex Elder { 2068589d30e0SAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2069589d30e0SAlex Elder 20700d7dbfceSAlex Elder return sprintf(buf, "%s\n", rbd_dev->spec->image_id); 2071589d30e0SAlex Elder } 2072589d30e0SAlex Elder 207334b13184SAlex Elder /* 207434b13184SAlex Elder * Shows the name of the currently-mapped snapshot (or 207534b13184SAlex Elder * RBD_SNAP_HEAD_NAME for the base image). 207634b13184SAlex Elder */ 2077dfc5606dSYehuda Sadeh static ssize_t rbd_snap_show(struct device *dev, 2078dfc5606dSYehuda Sadeh struct device_attribute *attr, 2079dfc5606dSYehuda Sadeh char *buf) 2080dfc5606dSYehuda Sadeh { 2081593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2082dfc5606dSYehuda Sadeh 20830d7dbfceSAlex Elder return sprintf(buf, "%s\n", rbd_dev->spec->snap_name); 2084dfc5606dSYehuda Sadeh } 2085dfc5606dSYehuda Sadeh 208686b00e0dSAlex Elder /* 208786b00e0dSAlex Elder * For an rbd v2 image, shows the pool id, image id, and snapshot id 208886b00e0dSAlex Elder * for the parent image. If there is no parent, simply shows 208986b00e0dSAlex Elder * "(no parent image)". 209086b00e0dSAlex Elder */ 209186b00e0dSAlex Elder static ssize_t rbd_parent_show(struct device *dev, 209286b00e0dSAlex Elder struct device_attribute *attr, 209386b00e0dSAlex Elder char *buf) 209486b00e0dSAlex Elder { 209586b00e0dSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 209686b00e0dSAlex Elder struct rbd_spec *spec = rbd_dev->parent_spec; 209786b00e0dSAlex Elder int count; 209886b00e0dSAlex Elder char *bufp = buf; 209986b00e0dSAlex Elder 210086b00e0dSAlex Elder if (!spec) 210186b00e0dSAlex Elder return sprintf(buf, "(no parent image)\n"); 210286b00e0dSAlex Elder 210386b00e0dSAlex Elder count = sprintf(bufp, "pool_id %llu\npool_name %s\n", 210486b00e0dSAlex Elder (unsigned long long) spec->pool_id, spec->pool_name); 210586b00e0dSAlex Elder if (count < 0) 210686b00e0dSAlex Elder return count; 210786b00e0dSAlex Elder bufp += count; 210886b00e0dSAlex Elder 210986b00e0dSAlex Elder count = sprintf(bufp, "image_id %s\nimage_name %s\n", spec->image_id, 211086b00e0dSAlex Elder spec->image_name ? spec->image_name : "(unknown)"); 211186b00e0dSAlex Elder if (count < 0) 211286b00e0dSAlex Elder return count; 211386b00e0dSAlex Elder bufp += count; 211486b00e0dSAlex Elder 211586b00e0dSAlex Elder count = sprintf(bufp, "snap_id %llu\nsnap_name %s\n", 211686b00e0dSAlex Elder (unsigned long long) spec->snap_id, spec->snap_name); 211786b00e0dSAlex Elder if (count < 0) 211886b00e0dSAlex Elder return count; 211986b00e0dSAlex Elder bufp += count; 212086b00e0dSAlex Elder 212186b00e0dSAlex Elder count = sprintf(bufp, "overlap %llu\n", rbd_dev->parent_overlap); 212286b00e0dSAlex Elder if (count < 0) 212386b00e0dSAlex Elder return count; 212486b00e0dSAlex Elder bufp += count; 212586b00e0dSAlex Elder 212686b00e0dSAlex Elder return (ssize_t) (bufp - buf); 212786b00e0dSAlex Elder } 212886b00e0dSAlex Elder 2129dfc5606dSYehuda Sadeh static ssize_t rbd_image_refresh(struct device *dev, 2130dfc5606dSYehuda Sadeh struct device_attribute *attr, 2131dfc5606dSYehuda Sadeh const char *buf, 2132dfc5606dSYehuda Sadeh size_t size) 2133dfc5606dSYehuda Sadeh { 2134593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 2135b813623aSAlex Elder int ret; 2136602adf40SYehuda Sadeh 2137117973fbSAlex Elder ret = rbd_dev_refresh(rbd_dev, NULL); 2138b813623aSAlex Elder 2139b813623aSAlex Elder return ret < 0 ? ret : size; 2140dfc5606dSYehuda Sadeh } 2141602adf40SYehuda Sadeh 2142dfc5606dSYehuda Sadeh static DEVICE_ATTR(size, S_IRUGO, rbd_size_show, NULL); 214334b13184SAlex Elder static DEVICE_ATTR(features, S_IRUGO, rbd_features_show, NULL); 2144dfc5606dSYehuda Sadeh static DEVICE_ATTR(major, S_IRUGO, rbd_major_show, NULL); 2145dfc5606dSYehuda Sadeh static DEVICE_ATTR(client_id, S_IRUGO, rbd_client_id_show, NULL); 2146dfc5606dSYehuda Sadeh static DEVICE_ATTR(pool, S_IRUGO, rbd_pool_show, NULL); 21479bb2f334SAlex Elder static DEVICE_ATTR(pool_id, S_IRUGO, rbd_pool_id_show, NULL); 2148dfc5606dSYehuda Sadeh static DEVICE_ATTR(name, S_IRUGO, rbd_name_show, NULL); 2149589d30e0SAlex Elder static DEVICE_ATTR(image_id, S_IRUGO, rbd_image_id_show, NULL); 2150dfc5606dSYehuda Sadeh static DEVICE_ATTR(refresh, S_IWUSR, NULL, rbd_image_refresh); 2151dfc5606dSYehuda Sadeh static DEVICE_ATTR(current_snap, S_IRUGO, rbd_snap_show, NULL); 215286b00e0dSAlex Elder static DEVICE_ATTR(parent, S_IRUGO, rbd_parent_show, NULL); 2153dfc5606dSYehuda Sadeh 2154dfc5606dSYehuda Sadeh static struct attribute *rbd_attrs[] = { 2155dfc5606dSYehuda Sadeh &dev_attr_size.attr, 215634b13184SAlex Elder &dev_attr_features.attr, 2157dfc5606dSYehuda Sadeh &dev_attr_major.attr, 2158dfc5606dSYehuda Sadeh &dev_attr_client_id.attr, 2159dfc5606dSYehuda Sadeh &dev_attr_pool.attr, 21609bb2f334SAlex Elder &dev_attr_pool_id.attr, 2161dfc5606dSYehuda Sadeh &dev_attr_name.attr, 2162589d30e0SAlex Elder &dev_attr_image_id.attr, 2163dfc5606dSYehuda Sadeh &dev_attr_current_snap.attr, 216486b00e0dSAlex Elder &dev_attr_parent.attr, 2165dfc5606dSYehuda Sadeh &dev_attr_refresh.attr, 2166dfc5606dSYehuda Sadeh NULL 2167dfc5606dSYehuda Sadeh }; 2168dfc5606dSYehuda Sadeh 2169dfc5606dSYehuda Sadeh static struct attribute_group rbd_attr_group = { 2170dfc5606dSYehuda Sadeh .attrs = rbd_attrs, 2171dfc5606dSYehuda Sadeh }; 2172dfc5606dSYehuda Sadeh 2173dfc5606dSYehuda Sadeh static const struct attribute_group *rbd_attr_groups[] = { 2174dfc5606dSYehuda Sadeh &rbd_attr_group, 2175dfc5606dSYehuda Sadeh NULL 2176dfc5606dSYehuda Sadeh }; 2177dfc5606dSYehuda Sadeh 2178dfc5606dSYehuda Sadeh static void rbd_sysfs_dev_release(struct device *dev) 2179dfc5606dSYehuda Sadeh { 2180dfc5606dSYehuda Sadeh } 2181dfc5606dSYehuda Sadeh 2182dfc5606dSYehuda Sadeh static struct device_type rbd_device_type = { 2183dfc5606dSYehuda Sadeh .name = "rbd", 2184dfc5606dSYehuda Sadeh .groups = rbd_attr_groups, 2185dfc5606dSYehuda Sadeh .release = rbd_sysfs_dev_release, 2186dfc5606dSYehuda Sadeh }; 2187dfc5606dSYehuda Sadeh 2188dfc5606dSYehuda Sadeh 2189dfc5606dSYehuda Sadeh /* 2190dfc5606dSYehuda Sadeh sysfs - snapshots 2191dfc5606dSYehuda Sadeh */ 2192dfc5606dSYehuda Sadeh 2193dfc5606dSYehuda Sadeh static ssize_t rbd_snap_size_show(struct device *dev, 2194dfc5606dSYehuda Sadeh struct device_attribute *attr, 2195dfc5606dSYehuda Sadeh char *buf) 2196dfc5606dSYehuda Sadeh { 2197dfc5606dSYehuda Sadeh struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); 2198dfc5606dSYehuda Sadeh 21993591538fSJosh Durgin return sprintf(buf, "%llu\n", (unsigned long long)snap->size); 2200dfc5606dSYehuda Sadeh } 2201dfc5606dSYehuda Sadeh 2202dfc5606dSYehuda Sadeh static ssize_t rbd_snap_id_show(struct device *dev, 2203dfc5606dSYehuda Sadeh struct device_attribute *attr, 2204dfc5606dSYehuda Sadeh char *buf) 2205dfc5606dSYehuda Sadeh { 2206dfc5606dSYehuda Sadeh struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); 2207dfc5606dSYehuda Sadeh 2208593a9e7bSAlex Elder return sprintf(buf, "%llu\n", (unsigned long long)snap->id); 2209dfc5606dSYehuda Sadeh } 2210dfc5606dSYehuda Sadeh 221134b13184SAlex Elder static ssize_t rbd_snap_features_show(struct device *dev, 221234b13184SAlex Elder struct device_attribute *attr, 221334b13184SAlex Elder char *buf) 221434b13184SAlex Elder { 221534b13184SAlex Elder struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); 221634b13184SAlex Elder 221734b13184SAlex Elder return sprintf(buf, "0x%016llx\n", 221834b13184SAlex Elder (unsigned long long) snap->features); 221934b13184SAlex Elder } 222034b13184SAlex Elder 2221dfc5606dSYehuda Sadeh static DEVICE_ATTR(snap_size, S_IRUGO, rbd_snap_size_show, NULL); 2222dfc5606dSYehuda Sadeh static DEVICE_ATTR(snap_id, S_IRUGO, rbd_snap_id_show, NULL); 222334b13184SAlex Elder static DEVICE_ATTR(snap_features, S_IRUGO, rbd_snap_features_show, NULL); 2224dfc5606dSYehuda Sadeh 2225dfc5606dSYehuda Sadeh static struct attribute *rbd_snap_attrs[] = { 2226dfc5606dSYehuda Sadeh &dev_attr_snap_size.attr, 2227dfc5606dSYehuda Sadeh &dev_attr_snap_id.attr, 222834b13184SAlex Elder &dev_attr_snap_features.attr, 2229dfc5606dSYehuda Sadeh NULL, 2230dfc5606dSYehuda Sadeh }; 2231dfc5606dSYehuda Sadeh 2232dfc5606dSYehuda Sadeh static struct attribute_group rbd_snap_attr_group = { 2233dfc5606dSYehuda Sadeh .attrs = rbd_snap_attrs, 2234dfc5606dSYehuda Sadeh }; 2235dfc5606dSYehuda Sadeh 2236dfc5606dSYehuda Sadeh static void rbd_snap_dev_release(struct device *dev) 2237dfc5606dSYehuda Sadeh { 2238dfc5606dSYehuda Sadeh struct rbd_snap *snap = container_of(dev, struct rbd_snap, dev); 2239dfc5606dSYehuda Sadeh kfree(snap->name); 2240dfc5606dSYehuda Sadeh kfree(snap); 2241dfc5606dSYehuda Sadeh } 2242dfc5606dSYehuda Sadeh 2243dfc5606dSYehuda Sadeh static const struct attribute_group *rbd_snap_attr_groups[] = { 2244dfc5606dSYehuda Sadeh &rbd_snap_attr_group, 2245dfc5606dSYehuda Sadeh NULL 2246dfc5606dSYehuda Sadeh }; 2247dfc5606dSYehuda Sadeh 2248dfc5606dSYehuda Sadeh static struct device_type rbd_snap_device_type = { 2249dfc5606dSYehuda Sadeh .groups = rbd_snap_attr_groups, 2250dfc5606dSYehuda Sadeh .release = rbd_snap_dev_release, 2251dfc5606dSYehuda Sadeh }; 2252dfc5606dSYehuda Sadeh 22538b8fb99cSAlex Elder static struct rbd_spec *rbd_spec_get(struct rbd_spec *spec) 22548b8fb99cSAlex Elder { 22558b8fb99cSAlex Elder kref_get(&spec->kref); 22568b8fb99cSAlex Elder 22578b8fb99cSAlex Elder return spec; 22588b8fb99cSAlex Elder } 22598b8fb99cSAlex Elder 22608b8fb99cSAlex Elder static void rbd_spec_free(struct kref *kref); 22618b8fb99cSAlex Elder static void rbd_spec_put(struct rbd_spec *spec) 22628b8fb99cSAlex Elder { 22638b8fb99cSAlex Elder if (spec) 22648b8fb99cSAlex Elder kref_put(&spec->kref, rbd_spec_free); 22658b8fb99cSAlex Elder } 22668b8fb99cSAlex Elder 22678b8fb99cSAlex Elder static struct rbd_spec *rbd_spec_alloc(void) 22688b8fb99cSAlex Elder { 22698b8fb99cSAlex Elder struct rbd_spec *spec; 22708b8fb99cSAlex Elder 22718b8fb99cSAlex Elder spec = kzalloc(sizeof (*spec), GFP_KERNEL); 22728b8fb99cSAlex Elder if (!spec) 22738b8fb99cSAlex Elder return NULL; 22748b8fb99cSAlex Elder kref_init(&spec->kref); 22758b8fb99cSAlex Elder 22768b8fb99cSAlex Elder rbd_spec_put(rbd_spec_get(spec)); /* TEMPORARY */ 22778b8fb99cSAlex Elder 22788b8fb99cSAlex Elder return spec; 22798b8fb99cSAlex Elder } 22808b8fb99cSAlex Elder 22818b8fb99cSAlex Elder static void rbd_spec_free(struct kref *kref) 22828b8fb99cSAlex Elder { 22838b8fb99cSAlex Elder struct rbd_spec *spec = container_of(kref, struct rbd_spec, kref); 22848b8fb99cSAlex Elder 22858b8fb99cSAlex Elder kfree(spec->pool_name); 22868b8fb99cSAlex Elder kfree(spec->image_id); 22878b8fb99cSAlex Elder kfree(spec->image_name); 22888b8fb99cSAlex Elder kfree(spec->snap_name); 22898b8fb99cSAlex Elder kfree(spec); 22908b8fb99cSAlex Elder } 22918b8fb99cSAlex Elder 2292c53d5893SAlex Elder struct rbd_device *rbd_dev_create(struct rbd_client *rbdc, 2293c53d5893SAlex Elder struct rbd_spec *spec) 2294c53d5893SAlex Elder { 2295c53d5893SAlex Elder struct rbd_device *rbd_dev; 2296c53d5893SAlex Elder 2297c53d5893SAlex Elder rbd_dev = kzalloc(sizeof (*rbd_dev), GFP_KERNEL); 2298c53d5893SAlex Elder if (!rbd_dev) 2299c53d5893SAlex Elder return NULL; 2300c53d5893SAlex Elder 2301c53d5893SAlex Elder spin_lock_init(&rbd_dev->lock); 2302d78b650aSAlex Elder atomic_set(&rbd_dev->exists, 0); 2303c53d5893SAlex Elder INIT_LIST_HEAD(&rbd_dev->node); 2304c53d5893SAlex Elder INIT_LIST_HEAD(&rbd_dev->snaps); 2305c53d5893SAlex Elder init_rwsem(&rbd_dev->header_rwsem); 2306c53d5893SAlex Elder 2307c53d5893SAlex Elder rbd_dev->spec = spec; 2308c53d5893SAlex Elder rbd_dev->rbd_client = rbdc; 2309c53d5893SAlex Elder 2310c53d5893SAlex Elder return rbd_dev; 2311c53d5893SAlex Elder } 2312c53d5893SAlex Elder 2313c53d5893SAlex Elder static void rbd_dev_destroy(struct rbd_device *rbd_dev) 2314c53d5893SAlex Elder { 231586b00e0dSAlex Elder rbd_spec_put(rbd_dev->parent_spec); 2316c53d5893SAlex Elder kfree(rbd_dev->header_name); 2317c53d5893SAlex Elder rbd_put_client(rbd_dev->rbd_client); 2318c53d5893SAlex Elder rbd_spec_put(rbd_dev->spec); 2319c53d5893SAlex Elder kfree(rbd_dev); 2320c53d5893SAlex Elder } 2321c53d5893SAlex Elder 2322304f6808SAlex Elder static bool rbd_snap_registered(struct rbd_snap *snap) 2323304f6808SAlex Elder { 2324304f6808SAlex Elder bool ret = snap->dev.type == &rbd_snap_device_type; 2325304f6808SAlex Elder bool reg = device_is_registered(&snap->dev); 2326304f6808SAlex Elder 2327304f6808SAlex Elder rbd_assert(!ret ^ reg); 2328304f6808SAlex Elder 2329304f6808SAlex Elder return ret; 2330304f6808SAlex Elder } 2331304f6808SAlex Elder 233241f38c2bSAlex Elder static void rbd_remove_snap_dev(struct rbd_snap *snap) 2333dfc5606dSYehuda Sadeh { 2334dfc5606dSYehuda Sadeh list_del(&snap->node); 2335304f6808SAlex Elder if (device_is_registered(&snap->dev)) 2336dfc5606dSYehuda Sadeh device_unregister(&snap->dev); 2337dfc5606dSYehuda Sadeh } 2338dfc5606dSYehuda Sadeh 233914e7085dSAlex Elder static int rbd_register_snap_dev(struct rbd_snap *snap, 2340dfc5606dSYehuda Sadeh struct device *parent) 2341dfc5606dSYehuda Sadeh { 2342dfc5606dSYehuda Sadeh struct device *dev = &snap->dev; 2343dfc5606dSYehuda Sadeh int ret; 2344dfc5606dSYehuda Sadeh 2345dfc5606dSYehuda Sadeh dev->type = &rbd_snap_device_type; 2346dfc5606dSYehuda Sadeh dev->parent = parent; 2347dfc5606dSYehuda Sadeh dev->release = rbd_snap_dev_release; 2348d4b125e9SAlex Elder dev_set_name(dev, "%s%s", RBD_SNAP_DEV_NAME_PREFIX, snap->name); 2349304f6808SAlex Elder dout("%s: registering device for snapshot %s\n", __func__, snap->name); 2350304f6808SAlex Elder 2351dfc5606dSYehuda Sadeh ret = device_register(dev); 2352dfc5606dSYehuda Sadeh 2353dfc5606dSYehuda Sadeh return ret; 2354dfc5606dSYehuda Sadeh } 2355dfc5606dSYehuda Sadeh 23564e891e0aSAlex Elder static struct rbd_snap *__rbd_add_snap_dev(struct rbd_device *rbd_dev, 2357c8d18425SAlex Elder const char *snap_name, 235834b13184SAlex Elder u64 snap_id, u64 snap_size, 235934b13184SAlex Elder u64 snap_features) 2360dfc5606dSYehuda Sadeh { 23614e891e0aSAlex Elder struct rbd_snap *snap; 2362dfc5606dSYehuda Sadeh int ret; 23634e891e0aSAlex Elder 23644e891e0aSAlex Elder snap = kzalloc(sizeof (*snap), GFP_KERNEL); 2365dfc5606dSYehuda Sadeh if (!snap) 23664e891e0aSAlex Elder return ERR_PTR(-ENOMEM); 23674e891e0aSAlex Elder 23684e891e0aSAlex Elder ret = -ENOMEM; 2369c8d18425SAlex Elder snap->name = kstrdup(snap_name, GFP_KERNEL); 23704e891e0aSAlex Elder if (!snap->name) 23714e891e0aSAlex Elder goto err; 23724e891e0aSAlex Elder 2373c8d18425SAlex Elder snap->id = snap_id; 2374c8d18425SAlex Elder snap->size = snap_size; 237534b13184SAlex Elder snap->features = snap_features; 23764e891e0aSAlex Elder 23774e891e0aSAlex Elder return snap; 23784e891e0aSAlex Elder 2379dfc5606dSYehuda Sadeh err: 2380dfc5606dSYehuda Sadeh kfree(snap->name); 2381dfc5606dSYehuda Sadeh kfree(snap); 23824e891e0aSAlex Elder 23834e891e0aSAlex Elder return ERR_PTR(ret); 2384dfc5606dSYehuda Sadeh } 2385dfc5606dSYehuda Sadeh 2386cd892126SAlex Elder static char *rbd_dev_v1_snap_info(struct rbd_device *rbd_dev, u32 which, 2387cd892126SAlex Elder u64 *snap_size, u64 *snap_features) 2388cd892126SAlex Elder { 2389cd892126SAlex Elder char *snap_name; 2390cd892126SAlex Elder 2391cd892126SAlex Elder rbd_assert(which < rbd_dev->header.snapc->num_snaps); 2392cd892126SAlex Elder 2393cd892126SAlex Elder *snap_size = rbd_dev->header.snap_sizes[which]; 2394cd892126SAlex Elder *snap_features = 0; /* No features for v1 */ 2395cd892126SAlex Elder 2396cd892126SAlex Elder /* Skip over names until we find the one we are looking for */ 2397cd892126SAlex Elder 2398cd892126SAlex Elder snap_name = rbd_dev->header.snap_names; 2399cd892126SAlex Elder while (which--) 2400cd892126SAlex Elder snap_name += strlen(snap_name) + 1; 2401cd892126SAlex Elder 2402cd892126SAlex Elder return snap_name; 2403cd892126SAlex Elder } 2404cd892126SAlex Elder 2405dfc5606dSYehuda Sadeh /* 24069d475de5SAlex Elder * Get the size and object order for an image snapshot, or if 24079d475de5SAlex Elder * snap_id is CEPH_NOSNAP, gets this information for the base 24089d475de5SAlex Elder * image. 24099d475de5SAlex Elder */ 24109d475de5SAlex Elder static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id, 24119d475de5SAlex Elder u8 *order, u64 *snap_size) 24129d475de5SAlex Elder { 24139d475de5SAlex Elder __le64 snapid = cpu_to_le64(snap_id); 24149d475de5SAlex Elder int ret; 24159d475de5SAlex Elder struct { 24169d475de5SAlex Elder u8 order; 24179d475de5SAlex Elder __le64 size; 24189d475de5SAlex Elder } __attribute__ ((packed)) size_buf = { 0 }; 24199d475de5SAlex Elder 24209d475de5SAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 24219d475de5SAlex Elder "rbd", "get_size", 24229d475de5SAlex Elder (char *) &snapid, sizeof (snapid), 242307b2391fSAlex Elder (char *) &size_buf, sizeof (size_buf), NULL); 24249d475de5SAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 24259d475de5SAlex Elder if (ret < 0) 24269d475de5SAlex Elder return ret; 24279d475de5SAlex Elder 24289d475de5SAlex Elder *order = size_buf.order; 24299d475de5SAlex Elder *snap_size = le64_to_cpu(size_buf.size); 24309d475de5SAlex Elder 24319d475de5SAlex Elder dout(" snap_id 0x%016llx order = %u, snap_size = %llu\n", 24329d475de5SAlex Elder (unsigned long long) snap_id, (unsigned int) *order, 24339d475de5SAlex Elder (unsigned long long) *snap_size); 24349d475de5SAlex Elder 24359d475de5SAlex Elder return 0; 24369d475de5SAlex Elder } 24379d475de5SAlex Elder 24389d475de5SAlex Elder static int rbd_dev_v2_image_size(struct rbd_device *rbd_dev) 24399d475de5SAlex Elder { 24409d475de5SAlex Elder return _rbd_dev_v2_snap_size(rbd_dev, CEPH_NOSNAP, 24419d475de5SAlex Elder &rbd_dev->header.obj_order, 24429d475de5SAlex Elder &rbd_dev->header.image_size); 24439d475de5SAlex Elder } 24449d475de5SAlex Elder 24451e130199SAlex Elder static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev) 24461e130199SAlex Elder { 24471e130199SAlex Elder void *reply_buf; 24481e130199SAlex Elder int ret; 24491e130199SAlex Elder void *p; 24501e130199SAlex Elder 24511e130199SAlex Elder reply_buf = kzalloc(RBD_OBJ_PREFIX_LEN_MAX, GFP_KERNEL); 24521e130199SAlex Elder if (!reply_buf) 24531e130199SAlex Elder return -ENOMEM; 24541e130199SAlex Elder 24551e130199SAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 24561e130199SAlex Elder "rbd", "get_object_prefix", 24571e130199SAlex Elder NULL, 0, 245807b2391fSAlex Elder reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL); 24591e130199SAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 24601e130199SAlex Elder if (ret < 0) 24611e130199SAlex Elder goto out; 2462a0ea3a40SAlex Elder ret = 0; /* rbd_req_sync_exec() can return positive */ 24631e130199SAlex Elder 24641e130199SAlex Elder p = reply_buf; 24651e130199SAlex Elder rbd_dev->header.object_prefix = ceph_extract_encoded_string(&p, 24661e130199SAlex Elder p + RBD_OBJ_PREFIX_LEN_MAX, 24671e130199SAlex Elder NULL, GFP_NOIO); 24681e130199SAlex Elder 24691e130199SAlex Elder if (IS_ERR(rbd_dev->header.object_prefix)) { 24701e130199SAlex Elder ret = PTR_ERR(rbd_dev->header.object_prefix); 24711e130199SAlex Elder rbd_dev->header.object_prefix = NULL; 24721e130199SAlex Elder } else { 24731e130199SAlex Elder dout(" object_prefix = %s\n", rbd_dev->header.object_prefix); 24741e130199SAlex Elder } 24751e130199SAlex Elder 24761e130199SAlex Elder out: 24771e130199SAlex Elder kfree(reply_buf); 24781e130199SAlex Elder 24791e130199SAlex Elder return ret; 24801e130199SAlex Elder } 24811e130199SAlex Elder 2482b1b5402aSAlex Elder static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id, 2483b1b5402aSAlex Elder u64 *snap_features) 2484b1b5402aSAlex Elder { 2485b1b5402aSAlex Elder __le64 snapid = cpu_to_le64(snap_id); 2486b1b5402aSAlex Elder struct { 2487b1b5402aSAlex Elder __le64 features; 2488b1b5402aSAlex Elder __le64 incompat; 2489b1b5402aSAlex Elder } features_buf = { 0 }; 2490d889140cSAlex Elder u64 incompat; 2491b1b5402aSAlex Elder int ret; 2492b1b5402aSAlex Elder 2493b1b5402aSAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 2494b1b5402aSAlex Elder "rbd", "get_features", 2495b1b5402aSAlex Elder (char *) &snapid, sizeof (snapid), 2496b1b5402aSAlex Elder (char *) &features_buf, sizeof (features_buf), 249707b2391fSAlex Elder NULL); 2498b1b5402aSAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 2499b1b5402aSAlex Elder if (ret < 0) 2500b1b5402aSAlex Elder return ret; 2501d889140cSAlex Elder 2502d889140cSAlex Elder incompat = le64_to_cpu(features_buf.incompat); 2503d889140cSAlex Elder if (incompat & ~RBD_FEATURES_ALL) 2504b8f5c6edSAlex Elder return -ENXIO; 2505d889140cSAlex Elder 2506b1b5402aSAlex Elder *snap_features = le64_to_cpu(features_buf.features); 2507b1b5402aSAlex Elder 2508b1b5402aSAlex Elder dout(" snap_id 0x%016llx features = 0x%016llx incompat = 0x%016llx\n", 2509b1b5402aSAlex Elder (unsigned long long) snap_id, 2510b1b5402aSAlex Elder (unsigned long long) *snap_features, 2511b1b5402aSAlex Elder (unsigned long long) le64_to_cpu(features_buf.incompat)); 2512b1b5402aSAlex Elder 2513b1b5402aSAlex Elder return 0; 2514b1b5402aSAlex Elder } 2515b1b5402aSAlex Elder 2516b1b5402aSAlex Elder static int rbd_dev_v2_features(struct rbd_device *rbd_dev) 2517b1b5402aSAlex Elder { 2518b1b5402aSAlex Elder return _rbd_dev_v2_snap_features(rbd_dev, CEPH_NOSNAP, 2519b1b5402aSAlex Elder &rbd_dev->header.features); 2520b1b5402aSAlex Elder } 2521b1b5402aSAlex Elder 252286b00e0dSAlex Elder static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev) 252386b00e0dSAlex Elder { 252486b00e0dSAlex Elder struct rbd_spec *parent_spec; 252586b00e0dSAlex Elder size_t size; 252686b00e0dSAlex Elder void *reply_buf = NULL; 252786b00e0dSAlex Elder __le64 snapid; 252886b00e0dSAlex Elder void *p; 252986b00e0dSAlex Elder void *end; 253086b00e0dSAlex Elder char *image_id; 253186b00e0dSAlex Elder u64 overlap; 253286b00e0dSAlex Elder int ret; 253386b00e0dSAlex Elder 253486b00e0dSAlex Elder parent_spec = rbd_spec_alloc(); 253586b00e0dSAlex Elder if (!parent_spec) 253686b00e0dSAlex Elder return -ENOMEM; 253786b00e0dSAlex Elder 253886b00e0dSAlex Elder size = sizeof (__le64) + /* pool_id */ 253986b00e0dSAlex Elder sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX + /* image_id */ 254086b00e0dSAlex Elder sizeof (__le64) + /* snap_id */ 254186b00e0dSAlex Elder sizeof (__le64); /* overlap */ 254286b00e0dSAlex Elder reply_buf = kmalloc(size, GFP_KERNEL); 254386b00e0dSAlex Elder if (!reply_buf) { 254486b00e0dSAlex Elder ret = -ENOMEM; 254586b00e0dSAlex Elder goto out_err; 254686b00e0dSAlex Elder } 254786b00e0dSAlex Elder 254886b00e0dSAlex Elder snapid = cpu_to_le64(CEPH_NOSNAP); 254986b00e0dSAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 255086b00e0dSAlex Elder "rbd", "get_parent", 255186b00e0dSAlex Elder (char *) &snapid, sizeof (snapid), 255207b2391fSAlex Elder (char *) reply_buf, size, NULL); 255386b00e0dSAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 255486b00e0dSAlex Elder if (ret < 0) 255586b00e0dSAlex Elder goto out_err; 255686b00e0dSAlex Elder 255786b00e0dSAlex Elder ret = -ERANGE; 255886b00e0dSAlex Elder p = reply_buf; 255986b00e0dSAlex Elder end = (char *) reply_buf + size; 256086b00e0dSAlex Elder ceph_decode_64_safe(&p, end, parent_spec->pool_id, out_err); 256186b00e0dSAlex Elder if (parent_spec->pool_id == CEPH_NOPOOL) 256286b00e0dSAlex Elder goto out; /* No parent? No problem. */ 256386b00e0dSAlex Elder 2564979ed480SAlex Elder image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); 256586b00e0dSAlex Elder if (IS_ERR(image_id)) { 256686b00e0dSAlex Elder ret = PTR_ERR(image_id); 256786b00e0dSAlex Elder goto out_err; 256886b00e0dSAlex Elder } 256986b00e0dSAlex Elder parent_spec->image_id = image_id; 257086b00e0dSAlex Elder ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err); 257186b00e0dSAlex Elder ceph_decode_64_safe(&p, end, overlap, out_err); 257286b00e0dSAlex Elder 257386b00e0dSAlex Elder rbd_dev->parent_overlap = overlap; 257486b00e0dSAlex Elder rbd_dev->parent_spec = parent_spec; 257586b00e0dSAlex Elder parent_spec = NULL; /* rbd_dev now owns this */ 257686b00e0dSAlex Elder out: 257786b00e0dSAlex Elder ret = 0; 257886b00e0dSAlex Elder out_err: 257986b00e0dSAlex Elder kfree(reply_buf); 258086b00e0dSAlex Elder rbd_spec_put(parent_spec); 258186b00e0dSAlex Elder 258286b00e0dSAlex Elder return ret; 258386b00e0dSAlex Elder } 258486b00e0dSAlex Elder 25859e15b77dSAlex Elder static char *rbd_dev_image_name(struct rbd_device *rbd_dev) 25869e15b77dSAlex Elder { 25879e15b77dSAlex Elder size_t image_id_size; 25889e15b77dSAlex Elder char *image_id; 25899e15b77dSAlex Elder void *p; 25909e15b77dSAlex Elder void *end; 25919e15b77dSAlex Elder size_t size; 25929e15b77dSAlex Elder void *reply_buf = NULL; 25939e15b77dSAlex Elder size_t len = 0; 25949e15b77dSAlex Elder char *image_name = NULL; 25959e15b77dSAlex Elder int ret; 25969e15b77dSAlex Elder 25979e15b77dSAlex Elder rbd_assert(!rbd_dev->spec->image_name); 25989e15b77dSAlex Elder 259969e7a02fSAlex Elder len = strlen(rbd_dev->spec->image_id); 260069e7a02fSAlex Elder image_id_size = sizeof (__le32) + len; 26019e15b77dSAlex Elder image_id = kmalloc(image_id_size, GFP_KERNEL); 26029e15b77dSAlex Elder if (!image_id) 26039e15b77dSAlex Elder return NULL; 26049e15b77dSAlex Elder 26059e15b77dSAlex Elder p = image_id; 26069e15b77dSAlex Elder end = (char *) image_id + image_id_size; 260769e7a02fSAlex Elder ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len); 26089e15b77dSAlex Elder 26099e15b77dSAlex Elder size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX; 26109e15b77dSAlex Elder reply_buf = kmalloc(size, GFP_KERNEL); 26119e15b77dSAlex Elder if (!reply_buf) 26129e15b77dSAlex Elder goto out; 26139e15b77dSAlex Elder 26149e15b77dSAlex Elder ret = rbd_req_sync_exec(rbd_dev, RBD_DIRECTORY, 26159e15b77dSAlex Elder "rbd", "dir_get_name", 26169e15b77dSAlex Elder image_id, image_id_size, 261707b2391fSAlex Elder (char *) reply_buf, size, NULL); 26189e15b77dSAlex Elder if (ret < 0) 26199e15b77dSAlex Elder goto out; 26209e15b77dSAlex Elder p = reply_buf; 26219e15b77dSAlex Elder end = (char *) reply_buf + size; 26229e15b77dSAlex Elder image_name = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL); 26239e15b77dSAlex Elder if (IS_ERR(image_name)) 26249e15b77dSAlex Elder image_name = NULL; 26259e15b77dSAlex Elder else 26269e15b77dSAlex Elder dout("%s: name is %s len is %zd\n", __func__, image_name, len); 26279e15b77dSAlex Elder out: 26289e15b77dSAlex Elder kfree(reply_buf); 26299e15b77dSAlex Elder kfree(image_id); 26309e15b77dSAlex Elder 26319e15b77dSAlex Elder return image_name; 26329e15b77dSAlex Elder } 26339e15b77dSAlex Elder 26349e15b77dSAlex Elder /* 26359e15b77dSAlex Elder * When a parent image gets probed, we only have the pool, image, 26369e15b77dSAlex Elder * and snapshot ids but not the names of any of them. This call 26379e15b77dSAlex Elder * is made later to fill in those names. It has to be done after 26389e15b77dSAlex Elder * rbd_dev_snaps_update() has completed because some of the 26399e15b77dSAlex Elder * information (in particular, snapshot name) is not available 26409e15b77dSAlex Elder * until then. 26419e15b77dSAlex Elder */ 26429e15b77dSAlex Elder static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev) 26439e15b77dSAlex Elder { 26449e15b77dSAlex Elder struct ceph_osd_client *osdc; 26459e15b77dSAlex Elder const char *name; 26469e15b77dSAlex Elder void *reply_buf = NULL; 26479e15b77dSAlex Elder int ret; 26489e15b77dSAlex Elder 26499e15b77dSAlex Elder if (rbd_dev->spec->pool_name) 26509e15b77dSAlex Elder return 0; /* Already have the names */ 26519e15b77dSAlex Elder 26529e15b77dSAlex Elder /* Look up the pool name */ 26539e15b77dSAlex Elder 26549e15b77dSAlex Elder osdc = &rbd_dev->rbd_client->client->osdc; 26559e15b77dSAlex Elder name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id); 2656935dc89fSAlex Elder if (!name) { 2657935dc89fSAlex Elder rbd_warn(rbd_dev, "there is no pool with id %llu", 2658935dc89fSAlex Elder rbd_dev->spec->pool_id); /* Really a BUG() */ 2659935dc89fSAlex Elder return -EIO; 2660935dc89fSAlex Elder } 26619e15b77dSAlex Elder 26629e15b77dSAlex Elder rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL); 26639e15b77dSAlex Elder if (!rbd_dev->spec->pool_name) 26649e15b77dSAlex Elder return -ENOMEM; 26659e15b77dSAlex Elder 26669e15b77dSAlex Elder /* Fetch the image name; tolerate failure here */ 26679e15b77dSAlex Elder 26689e15b77dSAlex Elder name = rbd_dev_image_name(rbd_dev); 266969e7a02fSAlex Elder if (name) 26709e15b77dSAlex Elder rbd_dev->spec->image_name = (char *) name; 267169e7a02fSAlex Elder else 267206ecc6cbSAlex Elder rbd_warn(rbd_dev, "unable to get image name"); 26739e15b77dSAlex Elder 26749e15b77dSAlex Elder /* Look up the snapshot name. */ 26759e15b77dSAlex Elder 26769e15b77dSAlex Elder name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id); 26779e15b77dSAlex Elder if (!name) { 2678935dc89fSAlex Elder rbd_warn(rbd_dev, "no snapshot with id %llu", 2679935dc89fSAlex Elder rbd_dev->spec->snap_id); /* Really a BUG() */ 26809e15b77dSAlex Elder ret = -EIO; 26819e15b77dSAlex Elder goto out_err; 26829e15b77dSAlex Elder } 26839e15b77dSAlex Elder rbd_dev->spec->snap_name = kstrdup(name, GFP_KERNEL); 26849e15b77dSAlex Elder if(!rbd_dev->spec->snap_name) 26859e15b77dSAlex Elder goto out_err; 26869e15b77dSAlex Elder 26879e15b77dSAlex Elder return 0; 26889e15b77dSAlex Elder out_err: 26899e15b77dSAlex Elder kfree(reply_buf); 26909e15b77dSAlex Elder kfree(rbd_dev->spec->pool_name); 26919e15b77dSAlex Elder rbd_dev->spec->pool_name = NULL; 26929e15b77dSAlex Elder 26939e15b77dSAlex Elder return ret; 26949e15b77dSAlex Elder } 26959e15b77dSAlex Elder 26966e14b1a6SAlex Elder static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver) 269735d489f9SAlex Elder { 269835d489f9SAlex Elder size_t size; 269935d489f9SAlex Elder int ret; 270035d489f9SAlex Elder void *reply_buf; 270135d489f9SAlex Elder void *p; 270235d489f9SAlex Elder void *end; 270335d489f9SAlex Elder u64 seq; 270435d489f9SAlex Elder u32 snap_count; 270535d489f9SAlex Elder struct ceph_snap_context *snapc; 270635d489f9SAlex Elder u32 i; 270735d489f9SAlex Elder 270835d489f9SAlex Elder /* 270935d489f9SAlex Elder * We'll need room for the seq value (maximum snapshot id), 271035d489f9SAlex Elder * snapshot count, and array of that many snapshot ids. 271135d489f9SAlex Elder * For now we have a fixed upper limit on the number we're 271235d489f9SAlex Elder * prepared to receive. 271335d489f9SAlex Elder */ 271435d489f9SAlex Elder size = sizeof (__le64) + sizeof (__le32) + 271535d489f9SAlex Elder RBD_MAX_SNAP_COUNT * sizeof (__le64); 271635d489f9SAlex Elder reply_buf = kzalloc(size, GFP_KERNEL); 271735d489f9SAlex Elder if (!reply_buf) 271835d489f9SAlex Elder return -ENOMEM; 271935d489f9SAlex Elder 272035d489f9SAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 272135d489f9SAlex Elder "rbd", "get_snapcontext", 272235d489f9SAlex Elder NULL, 0, 272307b2391fSAlex Elder reply_buf, size, ver); 272435d489f9SAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 272535d489f9SAlex Elder if (ret < 0) 272635d489f9SAlex Elder goto out; 272735d489f9SAlex Elder 272835d489f9SAlex Elder ret = -ERANGE; 272935d489f9SAlex Elder p = reply_buf; 273035d489f9SAlex Elder end = (char *) reply_buf + size; 273135d489f9SAlex Elder ceph_decode_64_safe(&p, end, seq, out); 273235d489f9SAlex Elder ceph_decode_32_safe(&p, end, snap_count, out); 273335d489f9SAlex Elder 273435d489f9SAlex Elder /* 273535d489f9SAlex Elder * Make sure the reported number of snapshot ids wouldn't go 273635d489f9SAlex Elder * beyond the end of our buffer. But before checking that, 273735d489f9SAlex Elder * make sure the computed size of the snapshot context we 273835d489f9SAlex Elder * allocate is representable in a size_t. 273935d489f9SAlex Elder */ 274035d489f9SAlex Elder if (snap_count > (SIZE_MAX - sizeof (struct ceph_snap_context)) 274135d489f9SAlex Elder / sizeof (u64)) { 274235d489f9SAlex Elder ret = -EINVAL; 274335d489f9SAlex Elder goto out; 274435d489f9SAlex Elder } 274535d489f9SAlex Elder if (!ceph_has_room(&p, end, snap_count * sizeof (__le64))) 274635d489f9SAlex Elder goto out; 274735d489f9SAlex Elder 274835d489f9SAlex Elder size = sizeof (struct ceph_snap_context) + 274935d489f9SAlex Elder snap_count * sizeof (snapc->snaps[0]); 275035d489f9SAlex Elder snapc = kmalloc(size, GFP_KERNEL); 275135d489f9SAlex Elder if (!snapc) { 275235d489f9SAlex Elder ret = -ENOMEM; 275335d489f9SAlex Elder goto out; 275435d489f9SAlex Elder } 275535d489f9SAlex Elder 275635d489f9SAlex Elder atomic_set(&snapc->nref, 1); 275735d489f9SAlex Elder snapc->seq = seq; 275835d489f9SAlex Elder snapc->num_snaps = snap_count; 275935d489f9SAlex Elder for (i = 0; i < snap_count; i++) 276035d489f9SAlex Elder snapc->snaps[i] = ceph_decode_64(&p); 276135d489f9SAlex Elder 276235d489f9SAlex Elder rbd_dev->header.snapc = snapc; 276335d489f9SAlex Elder 276435d489f9SAlex Elder dout(" snap context seq = %llu, snap_count = %u\n", 276535d489f9SAlex Elder (unsigned long long) seq, (unsigned int) snap_count); 276635d489f9SAlex Elder 276735d489f9SAlex Elder out: 276835d489f9SAlex Elder kfree(reply_buf); 276935d489f9SAlex Elder 277035d489f9SAlex Elder return 0; 277135d489f9SAlex Elder } 277235d489f9SAlex Elder 2773b8b1e2dbSAlex Elder static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which) 2774b8b1e2dbSAlex Elder { 2775b8b1e2dbSAlex Elder size_t size; 2776b8b1e2dbSAlex Elder void *reply_buf; 2777b8b1e2dbSAlex Elder __le64 snap_id; 2778b8b1e2dbSAlex Elder int ret; 2779b8b1e2dbSAlex Elder void *p; 2780b8b1e2dbSAlex Elder void *end; 2781b8b1e2dbSAlex Elder char *snap_name; 2782b8b1e2dbSAlex Elder 2783b8b1e2dbSAlex Elder size = sizeof (__le32) + RBD_MAX_SNAP_NAME_LEN; 2784b8b1e2dbSAlex Elder reply_buf = kmalloc(size, GFP_KERNEL); 2785b8b1e2dbSAlex Elder if (!reply_buf) 2786b8b1e2dbSAlex Elder return ERR_PTR(-ENOMEM); 2787b8b1e2dbSAlex Elder 2788b8b1e2dbSAlex Elder snap_id = cpu_to_le64(rbd_dev->header.snapc->snaps[which]); 2789b8b1e2dbSAlex Elder ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name, 2790b8b1e2dbSAlex Elder "rbd", "get_snapshot_name", 2791b8b1e2dbSAlex Elder (char *) &snap_id, sizeof (snap_id), 279207b2391fSAlex Elder reply_buf, size, NULL); 2793b8b1e2dbSAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 2794b8b1e2dbSAlex Elder if (ret < 0) 2795b8b1e2dbSAlex Elder goto out; 2796b8b1e2dbSAlex Elder 2797b8b1e2dbSAlex Elder p = reply_buf; 2798b8b1e2dbSAlex Elder end = (char *) reply_buf + size; 2799e5c35534SAlex Elder snap_name = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL); 2800b8b1e2dbSAlex Elder if (IS_ERR(snap_name)) { 2801b8b1e2dbSAlex Elder ret = PTR_ERR(snap_name); 2802b8b1e2dbSAlex Elder goto out; 2803b8b1e2dbSAlex Elder } else { 2804b8b1e2dbSAlex Elder dout(" snap_id 0x%016llx snap_name = %s\n", 2805b8b1e2dbSAlex Elder (unsigned long long) le64_to_cpu(snap_id), snap_name); 2806b8b1e2dbSAlex Elder } 2807b8b1e2dbSAlex Elder kfree(reply_buf); 2808b8b1e2dbSAlex Elder 2809b8b1e2dbSAlex Elder return snap_name; 2810b8b1e2dbSAlex Elder out: 2811b8b1e2dbSAlex Elder kfree(reply_buf); 2812b8b1e2dbSAlex Elder 2813b8b1e2dbSAlex Elder return ERR_PTR(ret); 2814b8b1e2dbSAlex Elder } 2815b8b1e2dbSAlex Elder 2816b8b1e2dbSAlex Elder static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which, 2817b8b1e2dbSAlex Elder u64 *snap_size, u64 *snap_features) 2818b8b1e2dbSAlex Elder { 2819b8b1e2dbSAlex Elder __le64 snap_id; 2820b8b1e2dbSAlex Elder u8 order; 2821b8b1e2dbSAlex Elder int ret; 2822b8b1e2dbSAlex Elder 2823b8b1e2dbSAlex Elder snap_id = rbd_dev->header.snapc->snaps[which]; 2824b8b1e2dbSAlex Elder ret = _rbd_dev_v2_snap_size(rbd_dev, snap_id, &order, snap_size); 2825b8b1e2dbSAlex Elder if (ret) 2826b8b1e2dbSAlex Elder return ERR_PTR(ret); 2827b8b1e2dbSAlex Elder ret = _rbd_dev_v2_snap_features(rbd_dev, snap_id, snap_features); 2828b8b1e2dbSAlex Elder if (ret) 2829b8b1e2dbSAlex Elder return ERR_PTR(ret); 2830b8b1e2dbSAlex Elder 2831b8b1e2dbSAlex Elder return rbd_dev_v2_snap_name(rbd_dev, which); 2832b8b1e2dbSAlex Elder } 2833b8b1e2dbSAlex Elder 2834b8b1e2dbSAlex Elder static char *rbd_dev_snap_info(struct rbd_device *rbd_dev, u32 which, 2835b8b1e2dbSAlex Elder u64 *snap_size, u64 *snap_features) 2836b8b1e2dbSAlex Elder { 2837b8b1e2dbSAlex Elder if (rbd_dev->image_format == 1) 2838b8b1e2dbSAlex Elder return rbd_dev_v1_snap_info(rbd_dev, which, 2839b8b1e2dbSAlex Elder snap_size, snap_features); 2840b8b1e2dbSAlex Elder if (rbd_dev->image_format == 2) 2841b8b1e2dbSAlex Elder return rbd_dev_v2_snap_info(rbd_dev, which, 2842b8b1e2dbSAlex Elder snap_size, snap_features); 2843b8b1e2dbSAlex Elder return ERR_PTR(-EINVAL); 2844b8b1e2dbSAlex Elder } 2845b8b1e2dbSAlex Elder 2846117973fbSAlex Elder static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver) 2847117973fbSAlex Elder { 2848117973fbSAlex Elder int ret; 2849117973fbSAlex Elder __u8 obj_order; 2850117973fbSAlex Elder 2851117973fbSAlex Elder down_write(&rbd_dev->header_rwsem); 2852117973fbSAlex Elder 2853117973fbSAlex Elder /* Grab old order first, to see if it changes */ 2854117973fbSAlex Elder 2855117973fbSAlex Elder obj_order = rbd_dev->header.obj_order, 2856117973fbSAlex Elder ret = rbd_dev_v2_image_size(rbd_dev); 2857117973fbSAlex Elder if (ret) 2858117973fbSAlex Elder goto out; 2859117973fbSAlex Elder if (rbd_dev->header.obj_order != obj_order) { 2860117973fbSAlex Elder ret = -EIO; 2861117973fbSAlex Elder goto out; 2862117973fbSAlex Elder } 2863117973fbSAlex Elder rbd_update_mapping_size(rbd_dev); 2864117973fbSAlex Elder 2865117973fbSAlex Elder ret = rbd_dev_v2_snap_context(rbd_dev, hver); 2866117973fbSAlex Elder dout("rbd_dev_v2_snap_context returned %d\n", ret); 2867117973fbSAlex Elder if (ret) 2868117973fbSAlex Elder goto out; 2869117973fbSAlex Elder ret = rbd_dev_snaps_update(rbd_dev); 2870117973fbSAlex Elder dout("rbd_dev_snaps_update returned %d\n", ret); 2871117973fbSAlex Elder if (ret) 2872117973fbSAlex Elder goto out; 2873117973fbSAlex Elder ret = rbd_dev_snaps_register(rbd_dev); 2874117973fbSAlex Elder dout("rbd_dev_snaps_register returned %d\n", ret); 2875117973fbSAlex Elder out: 2876117973fbSAlex Elder up_write(&rbd_dev->header_rwsem); 2877117973fbSAlex Elder 2878117973fbSAlex Elder return ret; 2879117973fbSAlex Elder } 2880117973fbSAlex Elder 28819d475de5SAlex Elder /* 288235938150SAlex Elder * Scan the rbd device's current snapshot list and compare it to the 288335938150SAlex Elder * newly-received snapshot context. Remove any existing snapshots 288435938150SAlex Elder * not present in the new snapshot context. Add a new snapshot for 288535938150SAlex Elder * any snaphots in the snapshot context not in the current list. 288635938150SAlex Elder * And verify there are no changes to snapshots we already know 288735938150SAlex Elder * about. 288835938150SAlex Elder * 288935938150SAlex Elder * Assumes the snapshots in the snapshot context are sorted by 289035938150SAlex Elder * snapshot id, highest id first. (Snapshots in the rbd_dev's list 289135938150SAlex Elder * are also maintained in that order.) 2892dfc5606dSYehuda Sadeh */ 2893304f6808SAlex Elder static int rbd_dev_snaps_update(struct rbd_device *rbd_dev) 2894dfc5606dSYehuda Sadeh { 289535938150SAlex Elder struct ceph_snap_context *snapc = rbd_dev->header.snapc; 289635938150SAlex Elder const u32 snap_count = snapc->num_snaps; 289735938150SAlex Elder struct list_head *head = &rbd_dev->snaps; 289835938150SAlex Elder struct list_head *links = head->next; 289935938150SAlex Elder u32 index = 0; 2900dfc5606dSYehuda Sadeh 29019fcbb800SAlex Elder dout("%s: snap count is %u\n", __func__, (unsigned int) snap_count); 290235938150SAlex Elder while (index < snap_count || links != head) { 290335938150SAlex Elder u64 snap_id; 290435938150SAlex Elder struct rbd_snap *snap; 2905cd892126SAlex Elder char *snap_name; 2906cd892126SAlex Elder u64 snap_size = 0; 2907cd892126SAlex Elder u64 snap_features = 0; 2908dfc5606dSYehuda Sadeh 290935938150SAlex Elder snap_id = index < snap_count ? snapc->snaps[index] 291035938150SAlex Elder : CEPH_NOSNAP; 291135938150SAlex Elder snap = links != head ? list_entry(links, struct rbd_snap, node) 291235938150SAlex Elder : NULL; 2913aafb230eSAlex Elder rbd_assert(!snap || snap->id != CEPH_NOSNAP); 2914dfc5606dSYehuda Sadeh 291535938150SAlex Elder if (snap_id == CEPH_NOSNAP || (snap && snap->id > snap_id)) { 291635938150SAlex Elder struct list_head *next = links->next; 2917dfc5606dSYehuda Sadeh 291835938150SAlex Elder /* Existing snapshot not in the new snap context */ 2919dfc5606dSYehuda Sadeh 29200d7dbfceSAlex Elder if (rbd_dev->spec->snap_id == snap->id) 2921d78b650aSAlex Elder atomic_set(&rbd_dev->exists, 0); 292241f38c2bSAlex Elder rbd_remove_snap_dev(snap); 29239fcbb800SAlex Elder dout("%ssnap id %llu has been removed\n", 29240d7dbfceSAlex Elder rbd_dev->spec->snap_id == snap->id ? 29250d7dbfceSAlex Elder "mapped " : "", 29269fcbb800SAlex Elder (unsigned long long) snap->id); 2927dfc5606dSYehuda Sadeh 292835938150SAlex Elder /* Done with this list entry; advance */ 292935938150SAlex Elder 293035938150SAlex Elder links = next; 293135938150SAlex Elder continue; 2932dfc5606dSYehuda Sadeh } 293335938150SAlex Elder 2934b8b1e2dbSAlex Elder snap_name = rbd_dev_snap_info(rbd_dev, index, 2935cd892126SAlex Elder &snap_size, &snap_features); 2936cd892126SAlex Elder if (IS_ERR(snap_name)) 2937cd892126SAlex Elder return PTR_ERR(snap_name); 2938cd892126SAlex Elder 29399fcbb800SAlex Elder dout("entry %u: snap_id = %llu\n", (unsigned int) snap_count, 29409fcbb800SAlex Elder (unsigned long long) snap_id); 294135938150SAlex Elder if (!snap || (snap_id != CEPH_NOSNAP && snap->id < snap_id)) { 294235938150SAlex Elder struct rbd_snap *new_snap; 294335938150SAlex Elder 294435938150SAlex Elder /* We haven't seen this snapshot before */ 294535938150SAlex Elder 2946c8d18425SAlex Elder new_snap = __rbd_add_snap_dev(rbd_dev, snap_name, 2947cd892126SAlex Elder snap_id, snap_size, snap_features); 29489fcbb800SAlex Elder if (IS_ERR(new_snap)) { 29499fcbb800SAlex Elder int err = PTR_ERR(new_snap); 29509fcbb800SAlex Elder 29519fcbb800SAlex Elder dout(" failed to add dev, error %d\n", err); 29529fcbb800SAlex Elder 29539fcbb800SAlex Elder return err; 29549fcbb800SAlex Elder } 295535938150SAlex Elder 295635938150SAlex Elder /* New goes before existing, or at end of list */ 295735938150SAlex Elder 29589fcbb800SAlex Elder dout(" added dev%s\n", snap ? "" : " at end\n"); 295935938150SAlex Elder if (snap) 296035938150SAlex Elder list_add_tail(&new_snap->node, &snap->node); 296135938150SAlex Elder else 2962523f3258SAlex Elder list_add_tail(&new_snap->node, head); 296335938150SAlex Elder } else { 296435938150SAlex Elder /* Already have this one */ 296535938150SAlex Elder 29669fcbb800SAlex Elder dout(" already present\n"); 29679fcbb800SAlex Elder 2968cd892126SAlex Elder rbd_assert(snap->size == snap_size); 2969aafb230eSAlex Elder rbd_assert(!strcmp(snap->name, snap_name)); 2970cd892126SAlex Elder rbd_assert(snap->features == snap_features); 297135938150SAlex Elder 297235938150SAlex Elder /* Done with this list entry; advance */ 297335938150SAlex Elder 297435938150SAlex Elder links = links->next; 2975dfc5606dSYehuda Sadeh } 297635938150SAlex Elder 297735938150SAlex Elder /* Advance to the next entry in the snapshot context */ 297835938150SAlex Elder 297935938150SAlex Elder index++; 2980dfc5606dSYehuda Sadeh } 29819fcbb800SAlex Elder dout("%s: done\n", __func__); 2982dfc5606dSYehuda Sadeh 2983dfc5606dSYehuda Sadeh return 0; 2984dfc5606dSYehuda Sadeh } 2985dfc5606dSYehuda Sadeh 2986304f6808SAlex Elder /* 2987304f6808SAlex Elder * Scan the list of snapshots and register the devices for any that 2988304f6808SAlex Elder * have not already been registered. 2989304f6808SAlex Elder */ 2990304f6808SAlex Elder static int rbd_dev_snaps_register(struct rbd_device *rbd_dev) 2991304f6808SAlex Elder { 2992304f6808SAlex Elder struct rbd_snap *snap; 2993304f6808SAlex Elder int ret = 0; 2994304f6808SAlex Elder 2995304f6808SAlex Elder dout("%s called\n", __func__); 299686ff77bbSAlex Elder if (WARN_ON(!device_is_registered(&rbd_dev->dev))) 299786ff77bbSAlex Elder return -EIO; 2998304f6808SAlex Elder 2999304f6808SAlex Elder list_for_each_entry(snap, &rbd_dev->snaps, node) { 3000304f6808SAlex Elder if (!rbd_snap_registered(snap)) { 3001304f6808SAlex Elder ret = rbd_register_snap_dev(snap, &rbd_dev->dev); 3002304f6808SAlex Elder if (ret < 0) 3003304f6808SAlex Elder break; 3004304f6808SAlex Elder } 3005304f6808SAlex Elder } 3006304f6808SAlex Elder dout("%s: returning %d\n", __func__, ret); 3007304f6808SAlex Elder 3008304f6808SAlex Elder return ret; 3009304f6808SAlex Elder } 3010304f6808SAlex Elder 3011dfc5606dSYehuda Sadeh static int rbd_bus_add_dev(struct rbd_device *rbd_dev) 3012dfc5606dSYehuda Sadeh { 3013dfc5606dSYehuda Sadeh struct device *dev; 3014cd789ab9SAlex Elder int ret; 3015dfc5606dSYehuda Sadeh 3016dfc5606dSYehuda Sadeh mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 3017dfc5606dSYehuda Sadeh 3018cd789ab9SAlex Elder dev = &rbd_dev->dev; 3019dfc5606dSYehuda Sadeh dev->bus = &rbd_bus_type; 3020dfc5606dSYehuda Sadeh dev->type = &rbd_device_type; 3021dfc5606dSYehuda Sadeh dev->parent = &rbd_root_dev; 3022dfc5606dSYehuda Sadeh dev->release = rbd_dev_release; 3023de71a297SAlex Elder dev_set_name(dev, "%d", rbd_dev->dev_id); 3024dfc5606dSYehuda Sadeh ret = device_register(dev); 3025dfc5606dSYehuda Sadeh 3026dfc5606dSYehuda Sadeh mutex_unlock(&ctl_mutex); 3027cd789ab9SAlex Elder 3028dfc5606dSYehuda Sadeh return ret; 3029602adf40SYehuda Sadeh } 3030602adf40SYehuda Sadeh 3031dfc5606dSYehuda Sadeh static void rbd_bus_del_dev(struct rbd_device *rbd_dev) 3032dfc5606dSYehuda Sadeh { 3033dfc5606dSYehuda Sadeh device_unregister(&rbd_dev->dev); 3034dfc5606dSYehuda Sadeh } 3035dfc5606dSYehuda Sadeh 303659c2be1eSYehuda Sadeh static int rbd_init_watch_dev(struct rbd_device *rbd_dev) 303759c2be1eSYehuda Sadeh { 303859c2be1eSYehuda Sadeh int ret, rc; 303959c2be1eSYehuda Sadeh 304059c2be1eSYehuda Sadeh do { 30410e6f322dSAlex Elder ret = rbd_req_sync_watch(rbd_dev); 304259c2be1eSYehuda Sadeh if (ret == -ERANGE) { 3043117973fbSAlex Elder rc = rbd_dev_refresh(rbd_dev, NULL); 304459c2be1eSYehuda Sadeh if (rc < 0) 304559c2be1eSYehuda Sadeh return rc; 304659c2be1eSYehuda Sadeh } 304759c2be1eSYehuda Sadeh } while (ret == -ERANGE); 304859c2be1eSYehuda Sadeh 304959c2be1eSYehuda Sadeh return ret; 305059c2be1eSYehuda Sadeh } 305159c2be1eSYehuda Sadeh 3052e2839308SAlex Elder static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0); 30531ddbe94eSAlex Elder 30541ddbe94eSAlex Elder /* 3055499afd5bSAlex Elder * Get a unique rbd identifier for the given new rbd_dev, and add 3056499afd5bSAlex Elder * the rbd_dev to the global list. The minimum rbd id is 1. 30571ddbe94eSAlex Elder */ 3058e2839308SAlex Elder static void rbd_dev_id_get(struct rbd_device *rbd_dev) 3059b7f23c36SAlex Elder { 3060e2839308SAlex Elder rbd_dev->dev_id = atomic64_inc_return(&rbd_dev_id_max); 3061499afd5bSAlex Elder 3062499afd5bSAlex Elder spin_lock(&rbd_dev_list_lock); 3063499afd5bSAlex Elder list_add_tail(&rbd_dev->node, &rbd_dev_list); 3064499afd5bSAlex Elder spin_unlock(&rbd_dev_list_lock); 3065e2839308SAlex Elder dout("rbd_dev %p given dev id %llu\n", rbd_dev, 3066e2839308SAlex Elder (unsigned long long) rbd_dev->dev_id); 3067b7f23c36SAlex Elder } 3068b7f23c36SAlex Elder 30691ddbe94eSAlex Elder /* 3070499afd5bSAlex Elder * Remove an rbd_dev from the global list, and record that its 3071499afd5bSAlex Elder * identifier is no longer in use. 30721ddbe94eSAlex Elder */ 3073e2839308SAlex Elder static void rbd_dev_id_put(struct rbd_device *rbd_dev) 30741ddbe94eSAlex Elder { 3075d184f6bfSAlex Elder struct list_head *tmp; 3076de71a297SAlex Elder int rbd_id = rbd_dev->dev_id; 3077d184f6bfSAlex Elder int max_id; 3078d184f6bfSAlex Elder 3079aafb230eSAlex Elder rbd_assert(rbd_id > 0); 3080499afd5bSAlex Elder 3081e2839308SAlex Elder dout("rbd_dev %p released dev id %llu\n", rbd_dev, 3082e2839308SAlex Elder (unsigned long long) rbd_dev->dev_id); 3083499afd5bSAlex Elder spin_lock(&rbd_dev_list_lock); 3084499afd5bSAlex Elder list_del_init(&rbd_dev->node); 3085d184f6bfSAlex Elder 3086d184f6bfSAlex Elder /* 3087d184f6bfSAlex Elder * If the id being "put" is not the current maximum, there 3088d184f6bfSAlex Elder * is nothing special we need to do. 3089d184f6bfSAlex Elder */ 3090e2839308SAlex Elder if (rbd_id != atomic64_read(&rbd_dev_id_max)) { 3091d184f6bfSAlex Elder spin_unlock(&rbd_dev_list_lock); 3092d184f6bfSAlex Elder return; 3093d184f6bfSAlex Elder } 3094d184f6bfSAlex Elder 3095d184f6bfSAlex Elder /* 3096d184f6bfSAlex Elder * We need to update the current maximum id. Search the 3097d184f6bfSAlex Elder * list to find out what it is. We're more likely to find 3098d184f6bfSAlex Elder * the maximum at the end, so search the list backward. 3099d184f6bfSAlex Elder */ 3100d184f6bfSAlex Elder max_id = 0; 3101d184f6bfSAlex Elder list_for_each_prev(tmp, &rbd_dev_list) { 3102d184f6bfSAlex Elder struct rbd_device *rbd_dev; 3103d184f6bfSAlex Elder 3104d184f6bfSAlex Elder rbd_dev = list_entry(tmp, struct rbd_device, node); 3105b213e0b1SAlex Elder if (rbd_dev->dev_id > max_id) 3106b213e0b1SAlex Elder max_id = rbd_dev->dev_id; 3107d184f6bfSAlex Elder } 3108499afd5bSAlex Elder spin_unlock(&rbd_dev_list_lock); 31091ddbe94eSAlex Elder 31101ddbe94eSAlex Elder /* 3111e2839308SAlex Elder * The max id could have been updated by rbd_dev_id_get(), in 3112d184f6bfSAlex Elder * which case it now accurately reflects the new maximum. 3113d184f6bfSAlex Elder * Be careful not to overwrite the maximum value in that 3114d184f6bfSAlex Elder * case. 31151ddbe94eSAlex Elder */ 3116e2839308SAlex Elder atomic64_cmpxchg(&rbd_dev_id_max, rbd_id, max_id); 3117e2839308SAlex Elder dout(" max dev id has been reset\n"); 3118b7f23c36SAlex Elder } 3119b7f23c36SAlex Elder 3120a725f65eSAlex Elder /* 3121e28fff26SAlex Elder * Skips over white space at *buf, and updates *buf to point to the 3122e28fff26SAlex Elder * first found non-space character (if any). Returns the length of 3123593a9e7bSAlex Elder * the token (string of non-white space characters) found. Note 3124593a9e7bSAlex Elder * that *buf must be terminated with '\0'. 3125e28fff26SAlex Elder */ 3126e28fff26SAlex Elder static inline size_t next_token(const char **buf) 3127e28fff26SAlex Elder { 3128e28fff26SAlex Elder /* 3129e28fff26SAlex Elder * These are the characters that produce nonzero for 3130e28fff26SAlex Elder * isspace() in the "C" and "POSIX" locales. 3131e28fff26SAlex Elder */ 3132e28fff26SAlex Elder const char *spaces = " \f\n\r\t\v"; 3133e28fff26SAlex Elder 3134e28fff26SAlex Elder *buf += strspn(*buf, spaces); /* Find start of token */ 3135e28fff26SAlex Elder 3136e28fff26SAlex Elder return strcspn(*buf, spaces); /* Return token length */ 3137e28fff26SAlex Elder } 3138e28fff26SAlex Elder 3139e28fff26SAlex Elder /* 3140e28fff26SAlex Elder * Finds the next token in *buf, and if the provided token buffer is 3141e28fff26SAlex Elder * big enough, copies the found token into it. The result, if 3142593a9e7bSAlex Elder * copied, is guaranteed to be terminated with '\0'. Note that *buf 3143593a9e7bSAlex Elder * must be terminated with '\0' on entry. 3144e28fff26SAlex Elder * 3145e28fff26SAlex Elder * Returns the length of the token found (not including the '\0'). 3146e28fff26SAlex Elder * Return value will be 0 if no token is found, and it will be >= 3147e28fff26SAlex Elder * token_size if the token would not fit. 3148e28fff26SAlex Elder * 3149593a9e7bSAlex Elder * The *buf pointer will be updated to point beyond the end of the 3150e28fff26SAlex Elder * found token. Note that this occurs even if the token buffer is 3151e28fff26SAlex Elder * too small to hold it. 3152e28fff26SAlex Elder */ 3153e28fff26SAlex Elder static inline size_t copy_token(const char **buf, 3154e28fff26SAlex Elder char *token, 3155e28fff26SAlex Elder size_t token_size) 3156e28fff26SAlex Elder { 3157e28fff26SAlex Elder size_t len; 3158e28fff26SAlex Elder 3159e28fff26SAlex Elder len = next_token(buf); 3160e28fff26SAlex Elder if (len < token_size) { 3161e28fff26SAlex Elder memcpy(token, *buf, len); 3162e28fff26SAlex Elder *(token + len) = '\0'; 3163e28fff26SAlex Elder } 3164e28fff26SAlex Elder *buf += len; 3165e28fff26SAlex Elder 3166e28fff26SAlex Elder return len; 3167e28fff26SAlex Elder } 3168e28fff26SAlex Elder 3169e28fff26SAlex Elder /* 3170ea3352f4SAlex Elder * Finds the next token in *buf, dynamically allocates a buffer big 3171ea3352f4SAlex Elder * enough to hold a copy of it, and copies the token into the new 3172ea3352f4SAlex Elder * buffer. The copy is guaranteed to be terminated with '\0'. Note 3173ea3352f4SAlex Elder * that a duplicate buffer is created even for a zero-length token. 3174ea3352f4SAlex Elder * 3175ea3352f4SAlex Elder * Returns a pointer to the newly-allocated duplicate, or a null 3176ea3352f4SAlex Elder * pointer if memory for the duplicate was not available. If 3177ea3352f4SAlex Elder * the lenp argument is a non-null pointer, the length of the token 3178ea3352f4SAlex Elder * (not including the '\0') is returned in *lenp. 3179ea3352f4SAlex Elder * 3180ea3352f4SAlex Elder * If successful, the *buf pointer will be updated to point beyond 3181ea3352f4SAlex Elder * the end of the found token. 3182ea3352f4SAlex Elder * 3183ea3352f4SAlex Elder * Note: uses GFP_KERNEL for allocation. 3184ea3352f4SAlex Elder */ 3185ea3352f4SAlex Elder static inline char *dup_token(const char **buf, size_t *lenp) 3186ea3352f4SAlex Elder { 3187ea3352f4SAlex Elder char *dup; 3188ea3352f4SAlex Elder size_t len; 3189ea3352f4SAlex Elder 3190ea3352f4SAlex Elder len = next_token(buf); 31914caf35f9SAlex Elder dup = kmemdup(*buf, len + 1, GFP_KERNEL); 3192ea3352f4SAlex Elder if (!dup) 3193ea3352f4SAlex Elder return NULL; 3194ea3352f4SAlex Elder *(dup + len) = '\0'; 3195ea3352f4SAlex Elder *buf += len; 3196ea3352f4SAlex Elder 3197ea3352f4SAlex Elder if (lenp) 3198ea3352f4SAlex Elder *lenp = len; 3199ea3352f4SAlex Elder 3200ea3352f4SAlex Elder return dup; 3201ea3352f4SAlex Elder } 3202ea3352f4SAlex Elder 3203ea3352f4SAlex Elder /* 3204859c31dfSAlex Elder * Parse the options provided for an "rbd add" (i.e., rbd image 3205859c31dfSAlex Elder * mapping) request. These arrive via a write to /sys/bus/rbd/add, 3206859c31dfSAlex Elder * and the data written is passed here via a NUL-terminated buffer. 3207859c31dfSAlex Elder * Returns 0 if successful or an error code otherwise. 3208d22f76e7SAlex Elder * 3209859c31dfSAlex Elder * The information extracted from these options is recorded in 3210859c31dfSAlex Elder * the other parameters which return dynamically-allocated 3211859c31dfSAlex Elder * structures: 3212859c31dfSAlex Elder * ceph_opts 3213859c31dfSAlex Elder * The address of a pointer that will refer to a ceph options 3214859c31dfSAlex Elder * structure. Caller must release the returned pointer using 3215859c31dfSAlex Elder * ceph_destroy_options() when it is no longer needed. 3216859c31dfSAlex Elder * rbd_opts 3217859c31dfSAlex Elder * Address of an rbd options pointer. Fully initialized by 3218859c31dfSAlex Elder * this function; caller must release with kfree(). 3219859c31dfSAlex Elder * spec 3220859c31dfSAlex Elder * Address of an rbd image specification pointer. Fully 3221859c31dfSAlex Elder * initialized by this function based on parsed options. 3222859c31dfSAlex Elder * Caller must release with rbd_spec_put(). 3223859c31dfSAlex Elder * 3224859c31dfSAlex Elder * The options passed take this form: 3225859c31dfSAlex Elder * <mon_addrs> <options> <pool_name> <image_name> [<snap_id>] 3226859c31dfSAlex Elder * where: 3227859c31dfSAlex Elder * <mon_addrs> 3228859c31dfSAlex Elder * A comma-separated list of one or more monitor addresses. 3229859c31dfSAlex Elder * A monitor address is an ip address, optionally followed 3230859c31dfSAlex Elder * by a port number (separated by a colon). 3231859c31dfSAlex Elder * I.e.: ip1[:port1][,ip2[:port2]...] 3232859c31dfSAlex Elder * <options> 3233859c31dfSAlex Elder * A comma-separated list of ceph and/or rbd options. 3234859c31dfSAlex Elder * <pool_name> 3235859c31dfSAlex Elder * The name of the rados pool containing the rbd image. 3236859c31dfSAlex Elder * <image_name> 3237859c31dfSAlex Elder * The name of the image in that pool to map. 3238859c31dfSAlex Elder * <snap_id> 3239859c31dfSAlex Elder * An optional snapshot id. If provided, the mapping will 3240859c31dfSAlex Elder * present data from the image at the time that snapshot was 3241859c31dfSAlex Elder * created. The image head is used if no snapshot id is 3242859c31dfSAlex Elder * provided. Snapshot mappings are always read-only. 3243a725f65eSAlex Elder */ 3244859c31dfSAlex Elder static int rbd_add_parse_args(const char *buf, 3245dc79b113SAlex Elder struct ceph_options **ceph_opts, 3246859c31dfSAlex Elder struct rbd_options **opts, 3247859c31dfSAlex Elder struct rbd_spec **rbd_spec) 3248a725f65eSAlex Elder { 3249e28fff26SAlex Elder size_t len; 3250859c31dfSAlex Elder char *options; 32510ddebc0cSAlex Elder const char *mon_addrs; 32520ddebc0cSAlex Elder size_t mon_addrs_size; 3253859c31dfSAlex Elder struct rbd_spec *spec = NULL; 32544e9afebaSAlex Elder struct rbd_options *rbd_opts = NULL; 3255859c31dfSAlex Elder struct ceph_options *copts; 3256dc79b113SAlex Elder int ret; 3257e28fff26SAlex Elder 3258e28fff26SAlex Elder /* The first four tokens are required */ 3259e28fff26SAlex Elder 32607ef3214aSAlex Elder len = next_token(&buf); 32614fb5d671SAlex Elder if (!len) { 32624fb5d671SAlex Elder rbd_warn(NULL, "no monitor address(es) provided"); 32634fb5d671SAlex Elder return -EINVAL; 32644fb5d671SAlex Elder } 32650ddebc0cSAlex Elder mon_addrs = buf; 3266f28e565aSAlex Elder mon_addrs_size = len + 1; 32677ef3214aSAlex Elder buf += len; 3268a725f65eSAlex Elder 3269dc79b113SAlex Elder ret = -EINVAL; 3270f28e565aSAlex Elder options = dup_token(&buf, NULL); 3271f28e565aSAlex Elder if (!options) 3272dc79b113SAlex Elder return -ENOMEM; 32734fb5d671SAlex Elder if (!*options) { 32744fb5d671SAlex Elder rbd_warn(NULL, "no options provided"); 32754fb5d671SAlex Elder goto out_err; 32764fb5d671SAlex Elder } 3277a725f65eSAlex Elder 3278859c31dfSAlex Elder spec = rbd_spec_alloc(); 3279859c31dfSAlex Elder if (!spec) 3280f28e565aSAlex Elder goto out_mem; 3281859c31dfSAlex Elder 3282859c31dfSAlex Elder spec->pool_name = dup_token(&buf, NULL); 3283859c31dfSAlex Elder if (!spec->pool_name) 3284859c31dfSAlex Elder goto out_mem; 32854fb5d671SAlex Elder if (!*spec->pool_name) { 32864fb5d671SAlex Elder rbd_warn(NULL, "no pool name provided"); 32874fb5d671SAlex Elder goto out_err; 32884fb5d671SAlex Elder } 3289e28fff26SAlex Elder 329069e7a02fSAlex Elder spec->image_name = dup_token(&buf, NULL); 3291859c31dfSAlex Elder if (!spec->image_name) 3292f28e565aSAlex Elder goto out_mem; 32934fb5d671SAlex Elder if (!*spec->image_name) { 32944fb5d671SAlex Elder rbd_warn(NULL, "no image name provided"); 32954fb5d671SAlex Elder goto out_err; 32964fb5d671SAlex Elder } 3297e28fff26SAlex Elder 3298f28e565aSAlex Elder /* 3299f28e565aSAlex Elder * Snapshot name is optional; default is to use "-" 3300f28e565aSAlex Elder * (indicating the head/no snapshot). 3301f28e565aSAlex Elder */ 33023feeb894SAlex Elder len = next_token(&buf); 3303820a5f3eSAlex Elder if (!len) { 33043feeb894SAlex Elder buf = RBD_SNAP_HEAD_NAME; /* No snapshot supplied */ 33053feeb894SAlex Elder len = sizeof (RBD_SNAP_HEAD_NAME) - 1; 3306f28e565aSAlex Elder } else if (len > RBD_MAX_SNAP_NAME_LEN) { 3307dc79b113SAlex Elder ret = -ENAMETOOLONG; 3308f28e565aSAlex Elder goto out_err; 3309849b4260SAlex Elder } 33104caf35f9SAlex Elder spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL); 3311859c31dfSAlex Elder if (!spec->snap_name) 3312f28e565aSAlex Elder goto out_mem; 3313859c31dfSAlex Elder *(spec->snap_name + len) = '\0'; 3314e5c35534SAlex Elder 33150ddebc0cSAlex Elder /* Initialize all rbd options to the defaults */ 3316e28fff26SAlex Elder 33174e9afebaSAlex Elder rbd_opts = kzalloc(sizeof (*rbd_opts), GFP_KERNEL); 33184e9afebaSAlex Elder if (!rbd_opts) 33194e9afebaSAlex Elder goto out_mem; 33204e9afebaSAlex Elder 33214e9afebaSAlex Elder rbd_opts->read_only = RBD_READ_ONLY_DEFAULT; 3322d22f76e7SAlex Elder 3323859c31dfSAlex Elder copts = ceph_parse_options(options, mon_addrs, 33240ddebc0cSAlex Elder mon_addrs + mon_addrs_size - 1, 33254e9afebaSAlex Elder parse_rbd_opts_token, rbd_opts); 3326859c31dfSAlex Elder if (IS_ERR(copts)) { 3327859c31dfSAlex Elder ret = PTR_ERR(copts); 3328dc79b113SAlex Elder goto out_err; 3329dc79b113SAlex Elder } 3330859c31dfSAlex Elder kfree(options); 3331859c31dfSAlex Elder 3332859c31dfSAlex Elder *ceph_opts = copts; 33334e9afebaSAlex Elder *opts = rbd_opts; 3334859c31dfSAlex Elder *rbd_spec = spec; 33350ddebc0cSAlex Elder 3336dc79b113SAlex Elder return 0; 3337f28e565aSAlex Elder out_mem: 3338dc79b113SAlex Elder ret = -ENOMEM; 3339d22f76e7SAlex Elder out_err: 3340859c31dfSAlex Elder kfree(rbd_opts); 3341859c31dfSAlex Elder rbd_spec_put(spec); 3342f28e565aSAlex Elder kfree(options); 3343d22f76e7SAlex Elder 3344dc79b113SAlex Elder return ret; 3345a725f65eSAlex Elder } 3346a725f65eSAlex Elder 3347589d30e0SAlex Elder /* 3348589d30e0SAlex Elder * An rbd format 2 image has a unique identifier, distinct from the 3349589d30e0SAlex Elder * name given to it by the user. Internally, that identifier is 3350589d30e0SAlex Elder * what's used to specify the names of objects related to the image. 3351589d30e0SAlex Elder * 3352589d30e0SAlex Elder * A special "rbd id" object is used to map an rbd image name to its 3353589d30e0SAlex Elder * id. If that object doesn't exist, then there is no v2 rbd image 3354589d30e0SAlex Elder * with the supplied name. 3355589d30e0SAlex Elder * 3356589d30e0SAlex Elder * This function will record the given rbd_dev's image_id field if 3357589d30e0SAlex Elder * it can be determined, and in that case will return 0. If any 3358589d30e0SAlex Elder * errors occur a negative errno will be returned and the rbd_dev's 3359589d30e0SAlex Elder * image_id field will be unchanged (and should be NULL). 3360589d30e0SAlex Elder */ 3361589d30e0SAlex Elder static int rbd_dev_image_id(struct rbd_device *rbd_dev) 3362589d30e0SAlex Elder { 3363589d30e0SAlex Elder int ret; 3364589d30e0SAlex Elder size_t size; 3365589d30e0SAlex Elder char *object_name; 3366589d30e0SAlex Elder void *response; 3367589d30e0SAlex Elder void *p; 3368589d30e0SAlex Elder 3369589d30e0SAlex Elder /* 33702c0d0a10SAlex Elder * When probing a parent image, the image id is already 33712c0d0a10SAlex Elder * known (and the image name likely is not). There's no 33722c0d0a10SAlex Elder * need to fetch the image id again in this case. 33732c0d0a10SAlex Elder */ 33742c0d0a10SAlex Elder if (rbd_dev->spec->image_id) 33752c0d0a10SAlex Elder return 0; 33762c0d0a10SAlex Elder 33772c0d0a10SAlex Elder /* 3378589d30e0SAlex Elder * First, see if the format 2 image id file exists, and if 3379589d30e0SAlex Elder * so, get the image's persistent id from it. 3380589d30e0SAlex Elder */ 338169e7a02fSAlex Elder size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name); 3382589d30e0SAlex Elder object_name = kmalloc(size, GFP_NOIO); 3383589d30e0SAlex Elder if (!object_name) 3384589d30e0SAlex Elder return -ENOMEM; 33850d7dbfceSAlex Elder sprintf(object_name, "%s%s", RBD_ID_PREFIX, rbd_dev->spec->image_name); 3386589d30e0SAlex Elder dout("rbd id object name is %s\n", object_name); 3387589d30e0SAlex Elder 3388589d30e0SAlex Elder /* Response will be an encoded string, which includes a length */ 3389589d30e0SAlex Elder 3390589d30e0SAlex Elder size = sizeof (__le32) + RBD_IMAGE_ID_LEN_MAX; 3391589d30e0SAlex Elder response = kzalloc(size, GFP_NOIO); 3392589d30e0SAlex Elder if (!response) { 3393589d30e0SAlex Elder ret = -ENOMEM; 3394589d30e0SAlex Elder goto out; 3395589d30e0SAlex Elder } 3396589d30e0SAlex Elder 3397589d30e0SAlex Elder ret = rbd_req_sync_exec(rbd_dev, object_name, 3398589d30e0SAlex Elder "rbd", "get_id", 3399589d30e0SAlex Elder NULL, 0, 340007b2391fSAlex Elder response, RBD_IMAGE_ID_LEN_MAX, NULL); 3401589d30e0SAlex Elder dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret); 3402589d30e0SAlex Elder if (ret < 0) 3403589d30e0SAlex Elder goto out; 3404a0ea3a40SAlex Elder ret = 0; /* rbd_req_sync_exec() can return positive */ 3405589d30e0SAlex Elder 3406589d30e0SAlex Elder p = response; 34070d7dbfceSAlex Elder rbd_dev->spec->image_id = ceph_extract_encoded_string(&p, 3408589d30e0SAlex Elder p + RBD_IMAGE_ID_LEN_MAX, 3409979ed480SAlex Elder NULL, GFP_NOIO); 34100d7dbfceSAlex Elder if (IS_ERR(rbd_dev->spec->image_id)) { 34110d7dbfceSAlex Elder ret = PTR_ERR(rbd_dev->spec->image_id); 34120d7dbfceSAlex Elder rbd_dev->spec->image_id = NULL; 3413589d30e0SAlex Elder } else { 34140d7dbfceSAlex Elder dout("image_id is %s\n", rbd_dev->spec->image_id); 3415589d30e0SAlex Elder } 3416589d30e0SAlex Elder out: 3417589d30e0SAlex Elder kfree(response); 3418589d30e0SAlex Elder kfree(object_name); 3419589d30e0SAlex Elder 3420589d30e0SAlex Elder return ret; 3421589d30e0SAlex Elder } 3422589d30e0SAlex Elder 3423a30b71b9SAlex Elder static int rbd_dev_v1_probe(struct rbd_device *rbd_dev) 3424a30b71b9SAlex Elder { 3425a30b71b9SAlex Elder int ret; 3426a30b71b9SAlex Elder size_t size; 3427a30b71b9SAlex Elder 3428a30b71b9SAlex Elder /* Version 1 images have no id; empty string is used */ 3429a30b71b9SAlex Elder 34300d7dbfceSAlex Elder rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL); 34310d7dbfceSAlex Elder if (!rbd_dev->spec->image_id) 3432a30b71b9SAlex Elder return -ENOMEM; 3433a30b71b9SAlex Elder 3434a30b71b9SAlex Elder /* Record the header object name for this rbd image. */ 3435a30b71b9SAlex Elder 343669e7a02fSAlex Elder size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX); 3437a30b71b9SAlex Elder rbd_dev->header_name = kmalloc(size, GFP_KERNEL); 3438a30b71b9SAlex Elder if (!rbd_dev->header_name) { 3439a30b71b9SAlex Elder ret = -ENOMEM; 3440a30b71b9SAlex Elder goto out_err; 3441a30b71b9SAlex Elder } 34420d7dbfceSAlex Elder sprintf(rbd_dev->header_name, "%s%s", 34430d7dbfceSAlex Elder rbd_dev->spec->image_name, RBD_SUFFIX); 3444a30b71b9SAlex Elder 3445a30b71b9SAlex Elder /* Populate rbd image metadata */ 3446a30b71b9SAlex Elder 3447a30b71b9SAlex Elder ret = rbd_read_header(rbd_dev, &rbd_dev->header); 3448a30b71b9SAlex Elder if (ret < 0) 3449a30b71b9SAlex Elder goto out_err; 345086b00e0dSAlex Elder 345186b00e0dSAlex Elder /* Version 1 images have no parent (no layering) */ 345286b00e0dSAlex Elder 345386b00e0dSAlex Elder rbd_dev->parent_spec = NULL; 345486b00e0dSAlex Elder rbd_dev->parent_overlap = 0; 345586b00e0dSAlex Elder 3456a30b71b9SAlex Elder rbd_dev->image_format = 1; 3457a30b71b9SAlex Elder 3458a30b71b9SAlex Elder dout("discovered version 1 image, header name is %s\n", 3459a30b71b9SAlex Elder rbd_dev->header_name); 3460a30b71b9SAlex Elder 3461a30b71b9SAlex Elder return 0; 3462a30b71b9SAlex Elder 3463a30b71b9SAlex Elder out_err: 3464a30b71b9SAlex Elder kfree(rbd_dev->header_name); 3465a30b71b9SAlex Elder rbd_dev->header_name = NULL; 34660d7dbfceSAlex Elder kfree(rbd_dev->spec->image_id); 34670d7dbfceSAlex Elder rbd_dev->spec->image_id = NULL; 3468a30b71b9SAlex Elder 3469a30b71b9SAlex Elder return ret; 3470a30b71b9SAlex Elder } 3471a30b71b9SAlex Elder 3472a30b71b9SAlex Elder static int rbd_dev_v2_probe(struct rbd_device *rbd_dev) 3473a30b71b9SAlex Elder { 3474a30b71b9SAlex Elder size_t size; 34759d475de5SAlex Elder int ret; 34766e14b1a6SAlex Elder u64 ver = 0; 3477a30b71b9SAlex Elder 3478a30b71b9SAlex Elder /* 3479a30b71b9SAlex Elder * Image id was filled in by the caller. Record the header 3480a30b71b9SAlex Elder * object name for this rbd image. 3481a30b71b9SAlex Elder */ 3482979ed480SAlex Elder size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id); 3483a30b71b9SAlex Elder rbd_dev->header_name = kmalloc(size, GFP_KERNEL); 3484a30b71b9SAlex Elder if (!rbd_dev->header_name) 3485a30b71b9SAlex Elder return -ENOMEM; 3486a30b71b9SAlex Elder sprintf(rbd_dev->header_name, "%s%s", 34870d7dbfceSAlex Elder RBD_HEADER_PREFIX, rbd_dev->spec->image_id); 34889d475de5SAlex Elder 34899d475de5SAlex Elder /* Get the size and object order for the image */ 34909d475de5SAlex Elder 34919d475de5SAlex Elder ret = rbd_dev_v2_image_size(rbd_dev); 34929d475de5SAlex Elder if (ret < 0) 34939d475de5SAlex Elder goto out_err; 34941e130199SAlex Elder 34951e130199SAlex Elder /* Get the object prefix (a.k.a. block_name) for the image */ 34961e130199SAlex Elder 34971e130199SAlex Elder ret = rbd_dev_v2_object_prefix(rbd_dev); 34981e130199SAlex Elder if (ret < 0) 34991e130199SAlex Elder goto out_err; 3500b1b5402aSAlex Elder 3501d889140cSAlex Elder /* Get the and check features for the image */ 3502b1b5402aSAlex Elder 3503b1b5402aSAlex Elder ret = rbd_dev_v2_features(rbd_dev); 3504b1b5402aSAlex Elder if (ret < 0) 3505b1b5402aSAlex Elder goto out_err; 350635d489f9SAlex Elder 350786b00e0dSAlex Elder /* If the image supports layering, get the parent info */ 350886b00e0dSAlex Elder 350986b00e0dSAlex Elder if (rbd_dev->header.features & RBD_FEATURE_LAYERING) { 351086b00e0dSAlex Elder ret = rbd_dev_v2_parent_info(rbd_dev); 351186b00e0dSAlex Elder if (ret < 0) 351286b00e0dSAlex Elder goto out_err; 351386b00e0dSAlex Elder } 351486b00e0dSAlex Elder 35156e14b1a6SAlex Elder /* crypto and compression type aren't (yet) supported for v2 images */ 351635d489f9SAlex Elder 35176e14b1a6SAlex Elder rbd_dev->header.crypt_type = 0; 35186e14b1a6SAlex Elder rbd_dev->header.comp_type = 0; 35196e14b1a6SAlex Elder 35206e14b1a6SAlex Elder /* Get the snapshot context, plus the header version */ 35216e14b1a6SAlex Elder 35226e14b1a6SAlex Elder ret = rbd_dev_v2_snap_context(rbd_dev, &ver); 352335d489f9SAlex Elder if (ret) 352435d489f9SAlex Elder goto out_err; 35256e14b1a6SAlex Elder rbd_dev->header.obj_version = ver; 35266e14b1a6SAlex Elder 3527a30b71b9SAlex Elder rbd_dev->image_format = 2; 3528a30b71b9SAlex Elder 3529a30b71b9SAlex Elder dout("discovered version 2 image, header name is %s\n", 3530a30b71b9SAlex Elder rbd_dev->header_name); 3531a30b71b9SAlex Elder 353235152979SAlex Elder return 0; 35339d475de5SAlex Elder out_err: 353486b00e0dSAlex Elder rbd_dev->parent_overlap = 0; 353586b00e0dSAlex Elder rbd_spec_put(rbd_dev->parent_spec); 353686b00e0dSAlex Elder rbd_dev->parent_spec = NULL; 35379d475de5SAlex Elder kfree(rbd_dev->header_name); 35389d475de5SAlex Elder rbd_dev->header_name = NULL; 35391e130199SAlex Elder kfree(rbd_dev->header.object_prefix); 35401e130199SAlex Elder rbd_dev->header.object_prefix = NULL; 35419d475de5SAlex Elder 35429d475de5SAlex Elder return ret; 3543a30b71b9SAlex Elder } 3544a30b71b9SAlex Elder 354583a06263SAlex Elder static int rbd_dev_probe_finish(struct rbd_device *rbd_dev) 354683a06263SAlex Elder { 354783a06263SAlex Elder int ret; 354883a06263SAlex Elder 354983a06263SAlex Elder /* no need to lock here, as rbd_dev is not registered yet */ 355083a06263SAlex Elder ret = rbd_dev_snaps_update(rbd_dev); 355183a06263SAlex Elder if (ret) 355283a06263SAlex Elder return ret; 355383a06263SAlex Elder 35549e15b77dSAlex Elder ret = rbd_dev_probe_update_spec(rbd_dev); 35559e15b77dSAlex Elder if (ret) 35569e15b77dSAlex Elder goto err_out_snaps; 35579e15b77dSAlex Elder 355883a06263SAlex Elder ret = rbd_dev_set_mapping(rbd_dev); 355983a06263SAlex Elder if (ret) 356083a06263SAlex Elder goto err_out_snaps; 356183a06263SAlex Elder 356283a06263SAlex Elder /* generate unique id: find highest unique id, add one */ 356383a06263SAlex Elder rbd_dev_id_get(rbd_dev); 356483a06263SAlex Elder 356583a06263SAlex Elder /* Fill in the device name, now that we have its id. */ 356683a06263SAlex Elder BUILD_BUG_ON(DEV_NAME_LEN 356783a06263SAlex Elder < sizeof (RBD_DRV_NAME) + MAX_INT_FORMAT_WIDTH); 356883a06263SAlex Elder sprintf(rbd_dev->name, "%s%d", RBD_DRV_NAME, rbd_dev->dev_id); 356983a06263SAlex Elder 357083a06263SAlex Elder /* Get our block major device number. */ 357183a06263SAlex Elder 357283a06263SAlex Elder ret = register_blkdev(0, rbd_dev->name); 357383a06263SAlex Elder if (ret < 0) 357483a06263SAlex Elder goto err_out_id; 357583a06263SAlex Elder rbd_dev->major = ret; 357683a06263SAlex Elder 357783a06263SAlex Elder /* Set up the blkdev mapping. */ 357883a06263SAlex Elder 357983a06263SAlex Elder ret = rbd_init_disk(rbd_dev); 358083a06263SAlex Elder if (ret) 358183a06263SAlex Elder goto err_out_blkdev; 358283a06263SAlex Elder 358383a06263SAlex Elder ret = rbd_bus_add_dev(rbd_dev); 358483a06263SAlex Elder if (ret) 358583a06263SAlex Elder goto err_out_disk; 358683a06263SAlex Elder 358783a06263SAlex Elder /* 358883a06263SAlex Elder * At this point cleanup in the event of an error is the job 358983a06263SAlex Elder * of the sysfs code (initiated by rbd_bus_del_dev()). 359083a06263SAlex Elder */ 359183a06263SAlex Elder down_write(&rbd_dev->header_rwsem); 359283a06263SAlex Elder ret = rbd_dev_snaps_register(rbd_dev); 359383a06263SAlex Elder up_write(&rbd_dev->header_rwsem); 359483a06263SAlex Elder if (ret) 359583a06263SAlex Elder goto err_out_bus; 359683a06263SAlex Elder 359783a06263SAlex Elder ret = rbd_init_watch_dev(rbd_dev); 359883a06263SAlex Elder if (ret) 359983a06263SAlex Elder goto err_out_bus; 360083a06263SAlex Elder 360183a06263SAlex Elder /* Everything's ready. Announce the disk to the world. */ 360283a06263SAlex Elder 360383a06263SAlex Elder add_disk(rbd_dev->disk); 360483a06263SAlex Elder 360583a06263SAlex Elder pr_info("%s: added with size 0x%llx\n", rbd_dev->disk->disk_name, 360683a06263SAlex Elder (unsigned long long) rbd_dev->mapping.size); 360783a06263SAlex Elder 360883a06263SAlex Elder return ret; 360983a06263SAlex Elder err_out_bus: 361083a06263SAlex Elder /* this will also clean up rest of rbd_dev stuff */ 361183a06263SAlex Elder 361283a06263SAlex Elder rbd_bus_del_dev(rbd_dev); 361383a06263SAlex Elder 361483a06263SAlex Elder return ret; 361583a06263SAlex Elder err_out_disk: 361683a06263SAlex Elder rbd_free_disk(rbd_dev); 361783a06263SAlex Elder err_out_blkdev: 361883a06263SAlex Elder unregister_blkdev(rbd_dev->major, rbd_dev->name); 361983a06263SAlex Elder err_out_id: 362083a06263SAlex Elder rbd_dev_id_put(rbd_dev); 362183a06263SAlex Elder err_out_snaps: 362283a06263SAlex Elder rbd_remove_all_snaps(rbd_dev); 362383a06263SAlex Elder 362483a06263SAlex Elder return ret; 362583a06263SAlex Elder } 362683a06263SAlex Elder 3627a30b71b9SAlex Elder /* 3628a30b71b9SAlex Elder * Probe for the existence of the header object for the given rbd 3629a30b71b9SAlex Elder * device. For format 2 images this includes determining the image 3630a30b71b9SAlex Elder * id. 3631a30b71b9SAlex Elder */ 3632a30b71b9SAlex Elder static int rbd_dev_probe(struct rbd_device *rbd_dev) 3633a30b71b9SAlex Elder { 3634a30b71b9SAlex Elder int ret; 3635a30b71b9SAlex Elder 3636a30b71b9SAlex Elder /* 3637a30b71b9SAlex Elder * Get the id from the image id object. If it's not a 3638a30b71b9SAlex Elder * format 2 image, we'll get ENOENT back, and we'll assume 3639a30b71b9SAlex Elder * it's a format 1 image. 3640a30b71b9SAlex Elder */ 3641a30b71b9SAlex Elder ret = rbd_dev_image_id(rbd_dev); 3642a30b71b9SAlex Elder if (ret) 3643a30b71b9SAlex Elder ret = rbd_dev_v1_probe(rbd_dev); 3644a30b71b9SAlex Elder else 3645a30b71b9SAlex Elder ret = rbd_dev_v2_probe(rbd_dev); 364683a06263SAlex Elder if (ret) { 3647a30b71b9SAlex Elder dout("probe failed, returning %d\n", ret); 3648a30b71b9SAlex Elder 3649a30b71b9SAlex Elder return ret; 3650a30b71b9SAlex Elder } 3651a30b71b9SAlex Elder 365283a06263SAlex Elder ret = rbd_dev_probe_finish(rbd_dev); 365383a06263SAlex Elder if (ret) 365483a06263SAlex Elder rbd_header_free(&rbd_dev->header); 365583a06263SAlex Elder 365683a06263SAlex Elder return ret; 365783a06263SAlex Elder } 365883a06263SAlex Elder 365959c2be1eSYehuda Sadeh static ssize_t rbd_add(struct bus_type *bus, 366059c2be1eSYehuda Sadeh const char *buf, 366159c2be1eSYehuda Sadeh size_t count) 3662602adf40SYehuda Sadeh { 3663cb8627c7SAlex Elder struct rbd_device *rbd_dev = NULL; 3664dc79b113SAlex Elder struct ceph_options *ceph_opts = NULL; 36654e9afebaSAlex Elder struct rbd_options *rbd_opts = NULL; 3666859c31dfSAlex Elder struct rbd_spec *spec = NULL; 36679d3997fdSAlex Elder struct rbd_client *rbdc; 366827cc2594SAlex Elder struct ceph_osd_client *osdc; 366927cc2594SAlex Elder int rc = -ENOMEM; 3670602adf40SYehuda Sadeh 3671602adf40SYehuda Sadeh if (!try_module_get(THIS_MODULE)) 3672602adf40SYehuda Sadeh return -ENODEV; 3673602adf40SYehuda Sadeh 3674a725f65eSAlex Elder /* parse add command */ 3675859c31dfSAlex Elder rc = rbd_add_parse_args(buf, &ceph_opts, &rbd_opts, &spec); 3676dc79b113SAlex Elder if (rc < 0) 3677bd4ba655SAlex Elder goto err_out_module; 3678a725f65eSAlex Elder 36799d3997fdSAlex Elder rbdc = rbd_get_client(ceph_opts); 36809d3997fdSAlex Elder if (IS_ERR(rbdc)) { 36819d3997fdSAlex Elder rc = PTR_ERR(rbdc); 36820ddebc0cSAlex Elder goto err_out_args; 36839d3997fdSAlex Elder } 3684c53d5893SAlex Elder ceph_opts = NULL; /* rbd_dev client now owns this */ 3685602adf40SYehuda Sadeh 3686602adf40SYehuda Sadeh /* pick the pool */ 36879d3997fdSAlex Elder osdc = &rbdc->client->osdc; 3688859c31dfSAlex Elder rc = ceph_pg_poolid_by_name(osdc->osdmap, spec->pool_name); 3689602adf40SYehuda Sadeh if (rc < 0) 3690602adf40SYehuda Sadeh goto err_out_client; 3691859c31dfSAlex Elder spec->pool_id = (u64) rc; 3692859c31dfSAlex Elder 3693c53d5893SAlex Elder rbd_dev = rbd_dev_create(rbdc, spec); 3694bd4ba655SAlex Elder if (!rbd_dev) 3695bd4ba655SAlex Elder goto err_out_client; 3696c53d5893SAlex Elder rbdc = NULL; /* rbd_dev now owns this */ 3697c53d5893SAlex Elder spec = NULL; /* rbd_dev now owns this */ 3698602adf40SYehuda Sadeh 3699bd4ba655SAlex Elder rbd_dev->mapping.read_only = rbd_opts->read_only; 3700c53d5893SAlex Elder kfree(rbd_opts); 3701c53d5893SAlex Elder rbd_opts = NULL; /* done with this */ 3702bd4ba655SAlex Elder 3703a30b71b9SAlex Elder rc = rbd_dev_probe(rbd_dev); 3704a30b71b9SAlex Elder if (rc < 0) 3705c53d5893SAlex Elder goto err_out_rbd_dev; 370605fd6f6fSAlex Elder 3707602adf40SYehuda Sadeh return count; 3708c53d5893SAlex Elder err_out_rbd_dev: 3709c53d5893SAlex Elder rbd_dev_destroy(rbd_dev); 3710bd4ba655SAlex Elder err_out_client: 37119d3997fdSAlex Elder rbd_put_client(rbdc); 37120ddebc0cSAlex Elder err_out_args: 371378cea76eSAlex Elder if (ceph_opts) 371478cea76eSAlex Elder ceph_destroy_options(ceph_opts); 37154e9afebaSAlex Elder kfree(rbd_opts); 3716859c31dfSAlex Elder rbd_spec_put(spec); 3717bd4ba655SAlex Elder err_out_module: 3718bd4ba655SAlex Elder module_put(THIS_MODULE); 371927cc2594SAlex Elder 3720602adf40SYehuda Sadeh dout("Error adding device %s\n", buf); 372127cc2594SAlex Elder 372227cc2594SAlex Elder return (ssize_t) rc; 3723602adf40SYehuda Sadeh } 3724602adf40SYehuda Sadeh 3725de71a297SAlex Elder static struct rbd_device *__rbd_get_dev(unsigned long dev_id) 3726602adf40SYehuda Sadeh { 3727602adf40SYehuda Sadeh struct list_head *tmp; 3728602adf40SYehuda Sadeh struct rbd_device *rbd_dev; 3729602adf40SYehuda Sadeh 3730e124a82fSAlex Elder spin_lock(&rbd_dev_list_lock); 3731602adf40SYehuda Sadeh list_for_each(tmp, &rbd_dev_list) { 3732602adf40SYehuda Sadeh rbd_dev = list_entry(tmp, struct rbd_device, node); 3733de71a297SAlex Elder if (rbd_dev->dev_id == dev_id) { 3734e124a82fSAlex Elder spin_unlock(&rbd_dev_list_lock); 3735602adf40SYehuda Sadeh return rbd_dev; 3736602adf40SYehuda Sadeh } 3737e124a82fSAlex Elder } 3738e124a82fSAlex Elder spin_unlock(&rbd_dev_list_lock); 3739602adf40SYehuda Sadeh return NULL; 3740602adf40SYehuda Sadeh } 3741602adf40SYehuda Sadeh 3742dfc5606dSYehuda Sadeh static void rbd_dev_release(struct device *dev) 3743602adf40SYehuda Sadeh { 3744593a9e7bSAlex Elder struct rbd_device *rbd_dev = dev_to_rbd_dev(dev); 3745602adf40SYehuda Sadeh 37461dbb4399SAlex Elder if (rbd_dev->watch_request) { 37471dbb4399SAlex Elder struct ceph_client *client = rbd_dev->rbd_client->client; 37481dbb4399SAlex Elder 37491dbb4399SAlex Elder ceph_osdc_unregister_linger_request(&client->osdc, 375059c2be1eSYehuda Sadeh rbd_dev->watch_request); 37511dbb4399SAlex Elder } 375259c2be1eSYehuda Sadeh if (rbd_dev->watch_event) 3753070c633fSAlex Elder rbd_req_sync_unwatch(rbd_dev); 375459c2be1eSYehuda Sadeh 3755602adf40SYehuda Sadeh 3756602adf40SYehuda Sadeh /* clean up and free blkdev */ 3757602adf40SYehuda Sadeh rbd_free_disk(rbd_dev); 3758602adf40SYehuda Sadeh unregister_blkdev(rbd_dev->major, rbd_dev->name); 375932eec68dSAlex Elder 37602ac4e75dSAlex Elder /* release allocated disk header fields */ 37612ac4e75dSAlex Elder rbd_header_free(&rbd_dev->header); 37622ac4e75dSAlex Elder 376332eec68dSAlex Elder /* done with the id, and with the rbd_dev */ 3764e2839308SAlex Elder rbd_dev_id_put(rbd_dev); 3765c53d5893SAlex Elder rbd_assert(rbd_dev->rbd_client != NULL); 3766c53d5893SAlex Elder rbd_dev_destroy(rbd_dev); 3767602adf40SYehuda Sadeh 3768602adf40SYehuda Sadeh /* release module ref */ 3769602adf40SYehuda Sadeh module_put(THIS_MODULE); 3770602adf40SYehuda Sadeh } 3771602adf40SYehuda Sadeh 3772dfc5606dSYehuda Sadeh static ssize_t rbd_remove(struct bus_type *bus, 3773602adf40SYehuda Sadeh const char *buf, 3774602adf40SYehuda Sadeh size_t count) 3775602adf40SYehuda Sadeh { 3776602adf40SYehuda Sadeh struct rbd_device *rbd_dev = NULL; 3777602adf40SYehuda Sadeh int target_id, rc; 3778602adf40SYehuda Sadeh unsigned long ul; 3779602adf40SYehuda Sadeh int ret = count; 3780602adf40SYehuda Sadeh 3781602adf40SYehuda Sadeh rc = strict_strtoul(buf, 10, &ul); 3782602adf40SYehuda Sadeh if (rc) 3783602adf40SYehuda Sadeh return rc; 3784602adf40SYehuda Sadeh 3785602adf40SYehuda Sadeh /* convert to int; abort if we lost anything in the conversion */ 3786602adf40SYehuda Sadeh target_id = (int) ul; 3787602adf40SYehuda Sadeh if (target_id != ul) 3788602adf40SYehuda Sadeh return -EINVAL; 3789602adf40SYehuda Sadeh 3790602adf40SYehuda Sadeh mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING); 3791602adf40SYehuda Sadeh 3792602adf40SYehuda Sadeh rbd_dev = __rbd_get_dev(target_id); 3793602adf40SYehuda Sadeh if (!rbd_dev) { 3794602adf40SYehuda Sadeh ret = -ENOENT; 3795602adf40SYehuda Sadeh goto done; 3796602adf40SYehuda Sadeh } 3797602adf40SYehuda Sadeh 379842382b70SAlex Elder if (rbd_dev->open_count) { 379942382b70SAlex Elder ret = -EBUSY; 380042382b70SAlex Elder goto done; 380142382b70SAlex Elder } 380242382b70SAlex Elder 380341f38c2bSAlex Elder rbd_remove_all_snaps(rbd_dev); 3804dfc5606dSYehuda Sadeh rbd_bus_del_dev(rbd_dev); 3805602adf40SYehuda Sadeh 3806602adf40SYehuda Sadeh done: 3807602adf40SYehuda Sadeh mutex_unlock(&ctl_mutex); 3808aafb230eSAlex Elder 3809602adf40SYehuda Sadeh return ret; 3810602adf40SYehuda Sadeh } 3811602adf40SYehuda Sadeh 3812602adf40SYehuda Sadeh /* 3813602adf40SYehuda Sadeh * create control files in sysfs 3814dfc5606dSYehuda Sadeh * /sys/bus/rbd/... 3815602adf40SYehuda Sadeh */ 3816602adf40SYehuda Sadeh static int rbd_sysfs_init(void) 3817602adf40SYehuda Sadeh { 3818dfc5606dSYehuda Sadeh int ret; 3819602adf40SYehuda Sadeh 3820fed4c143SAlex Elder ret = device_register(&rbd_root_dev); 3821dfc5606dSYehuda Sadeh if (ret < 0) 3822dfc5606dSYehuda Sadeh return ret; 3823602adf40SYehuda Sadeh 3824fed4c143SAlex Elder ret = bus_register(&rbd_bus_type); 3825fed4c143SAlex Elder if (ret < 0) 3826fed4c143SAlex Elder device_unregister(&rbd_root_dev); 3827602adf40SYehuda Sadeh 3828602adf40SYehuda Sadeh return ret; 3829602adf40SYehuda Sadeh } 3830602adf40SYehuda Sadeh 3831602adf40SYehuda Sadeh static void rbd_sysfs_cleanup(void) 3832602adf40SYehuda Sadeh { 3833dfc5606dSYehuda Sadeh bus_unregister(&rbd_bus_type); 3834fed4c143SAlex Elder device_unregister(&rbd_root_dev); 3835602adf40SYehuda Sadeh } 3836602adf40SYehuda Sadeh 3837602adf40SYehuda Sadeh int __init rbd_init(void) 3838602adf40SYehuda Sadeh { 3839602adf40SYehuda Sadeh int rc; 3840602adf40SYehuda Sadeh 3841602adf40SYehuda Sadeh rc = rbd_sysfs_init(); 3842602adf40SYehuda Sadeh if (rc) 3843602adf40SYehuda Sadeh return rc; 3844f0f8cef5SAlex Elder pr_info("loaded " RBD_DRV_NAME_LONG "\n"); 3845602adf40SYehuda Sadeh return 0; 3846602adf40SYehuda Sadeh } 3847602adf40SYehuda Sadeh 3848602adf40SYehuda Sadeh void __exit rbd_exit(void) 3849602adf40SYehuda Sadeh { 3850602adf40SYehuda Sadeh rbd_sysfs_cleanup(); 3851602adf40SYehuda Sadeh } 3852602adf40SYehuda Sadeh 3853602adf40SYehuda Sadeh module_init(rbd_init); 3854602adf40SYehuda Sadeh module_exit(rbd_exit); 3855602adf40SYehuda Sadeh 3856602adf40SYehuda Sadeh MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 3857602adf40SYehuda Sadeh MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 3858602adf40SYehuda Sadeh MODULE_DESCRIPTION("rados block device"); 3859602adf40SYehuda Sadeh 3860602adf40SYehuda Sadeh /* following authorship retained from original osdblk.c */ 3861602adf40SYehuda Sadeh MODULE_AUTHOR("Jeff Garzik <jeff@garzik.org>"); 3862602adf40SYehuda Sadeh 3863602adf40SYehuda Sadeh MODULE_LICENSE("GPL"); 3864