1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/ctype.h> 6 #include <linux/fs.h> 7 #include <linux/inet.h> 8 #include <linux/in6.h> 9 #include <linux/module.h> 10 #include <linux/mount.h> 11 #include <linux/parser.h> 12 #include <linux/sched.h> 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <linux/statfs.h> 16 #include <linux/string.h> 17 18 #include "super.h" 19 #include "mds_client.h" 20 21 #include <linux/ceph/ceph_features.h> 22 #include <linux/ceph/decode.h> 23 #include <linux/ceph/mon_client.h> 24 #include <linux/ceph/auth.h> 25 #include <linux/ceph/debugfs.h> 26 27 /* 28 * Ceph superblock operations 29 * 30 * Handle the basics of mounting, unmounting. 31 */ 32 33 /* 34 * super ops 35 */ 36 static void ceph_put_super(struct super_block *s) 37 { 38 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 39 40 dout("put_super\n"); 41 ceph_mdsc_close_sessions(fsc->mdsc); 42 43 /* 44 * ensure we release the bdi before put_anon_super releases 45 * the device name. 46 */ 47 if (s->s_bdi == &fsc->backing_dev_info) { 48 bdi_unregister(&fsc->backing_dev_info); 49 s->s_bdi = NULL; 50 } 51 52 return; 53 } 54 55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 56 { 57 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode); 58 struct ceph_monmap *monmap = fsc->client->monc.monmap; 59 struct ceph_statfs st; 60 u64 fsid; 61 int err; 62 63 dout("statfs\n"); 64 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 65 if (err < 0) 66 return err; 67 68 /* fill in kstatfs */ 69 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 70 71 /* 72 * express utilization in terms of large blocks to avoid 73 * overflow on 32-bit machines. 74 */ 75 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 76 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 77 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 78 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 79 80 buf->f_files = le64_to_cpu(st.num_objects); 81 buf->f_ffree = -1; 82 buf->f_namelen = NAME_MAX; 83 buf->f_frsize = PAGE_CACHE_SIZE; 84 85 /* leave fsid little-endian, regardless of host endianness */ 86 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 87 buf->f_fsid.val[0] = fsid & 0xffffffff; 88 buf->f_fsid.val[1] = fsid >> 32; 89 90 return 0; 91 } 92 93 94 static int ceph_sync_fs(struct super_block *sb, int wait) 95 { 96 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 97 98 if (!wait) { 99 dout("sync_fs (non-blocking)\n"); 100 ceph_flush_dirty_caps(fsc->mdsc); 101 dout("sync_fs (non-blocking) done\n"); 102 return 0; 103 } 104 105 dout("sync_fs (blocking)\n"); 106 ceph_osdc_sync(&fsc->client->osdc); 107 ceph_mdsc_sync(fsc->mdsc); 108 dout("sync_fs (blocking) done\n"); 109 return 0; 110 } 111 112 /* 113 * mount options 114 */ 115 enum { 116 Opt_wsize, 117 Opt_rsize, 118 Opt_rasize, 119 Opt_caps_wanted_delay_min, 120 Opt_caps_wanted_delay_max, 121 Opt_cap_release_safety, 122 Opt_readdir_max_entries, 123 Opt_readdir_max_bytes, 124 Opt_congestion_kb, 125 Opt_last_int, 126 /* int args above */ 127 Opt_snapdirname, 128 Opt_last_string, 129 /* string args above */ 130 Opt_dirstat, 131 Opt_nodirstat, 132 Opt_rbytes, 133 Opt_norbytes, 134 Opt_asyncreaddir, 135 Opt_noasyncreaddir, 136 Opt_dcache, 137 Opt_nodcache, 138 Opt_ino32, 139 Opt_noino32, 140 }; 141 142 static match_table_t fsopt_tokens = { 143 {Opt_wsize, "wsize=%d"}, 144 {Opt_rsize, "rsize=%d"}, 145 {Opt_rasize, "rasize=%d"}, 146 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 147 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 148 {Opt_cap_release_safety, "cap_release_safety=%d"}, 149 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 150 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 151 {Opt_congestion_kb, "write_congestion_kb=%d"}, 152 /* int args above */ 153 {Opt_snapdirname, "snapdirname=%s"}, 154 /* string args above */ 155 {Opt_dirstat, "dirstat"}, 156 {Opt_nodirstat, "nodirstat"}, 157 {Opt_rbytes, "rbytes"}, 158 {Opt_norbytes, "norbytes"}, 159 {Opt_asyncreaddir, "asyncreaddir"}, 160 {Opt_noasyncreaddir, "noasyncreaddir"}, 161 {Opt_dcache, "dcache"}, 162 {Opt_nodcache, "nodcache"}, 163 {Opt_ino32, "ino32"}, 164 {Opt_noino32, "noino32"}, 165 {-1, NULL} 166 }; 167 168 static int parse_fsopt_token(char *c, void *private) 169 { 170 struct ceph_mount_options *fsopt = private; 171 substring_t argstr[MAX_OPT_ARGS]; 172 int token, intval, ret; 173 174 token = match_token((char *)c, fsopt_tokens, argstr); 175 if (token < 0) 176 return -EINVAL; 177 178 if (token < Opt_last_int) { 179 ret = match_int(&argstr[0], &intval); 180 if (ret < 0) { 181 pr_err("bad mount option arg (not int) " 182 "at '%s'\n", c); 183 return ret; 184 } 185 dout("got int token %d val %d\n", token, intval); 186 } else if (token > Opt_last_int && token < Opt_last_string) { 187 dout("got string token %d val %s\n", token, 188 argstr[0].from); 189 } else { 190 dout("got token %d\n", token); 191 } 192 193 switch (token) { 194 case Opt_snapdirname: 195 kfree(fsopt->snapdir_name); 196 fsopt->snapdir_name = kstrndup(argstr[0].from, 197 argstr[0].to-argstr[0].from, 198 GFP_KERNEL); 199 if (!fsopt->snapdir_name) 200 return -ENOMEM; 201 break; 202 203 /* misc */ 204 case Opt_wsize: 205 fsopt->wsize = intval; 206 break; 207 case Opt_rsize: 208 fsopt->rsize = intval; 209 break; 210 case Opt_rasize: 211 fsopt->rasize = intval; 212 break; 213 case Opt_caps_wanted_delay_min: 214 fsopt->caps_wanted_delay_min = intval; 215 break; 216 case Opt_caps_wanted_delay_max: 217 fsopt->caps_wanted_delay_max = intval; 218 break; 219 case Opt_readdir_max_entries: 220 fsopt->max_readdir = intval; 221 break; 222 case Opt_readdir_max_bytes: 223 fsopt->max_readdir_bytes = intval; 224 break; 225 case Opt_congestion_kb: 226 fsopt->congestion_kb = intval; 227 break; 228 case Opt_dirstat: 229 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 230 break; 231 case Opt_nodirstat: 232 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 233 break; 234 case Opt_rbytes: 235 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 236 break; 237 case Opt_norbytes: 238 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 239 break; 240 case Opt_asyncreaddir: 241 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 242 break; 243 case Opt_noasyncreaddir: 244 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 245 break; 246 case Opt_dcache: 247 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 248 break; 249 case Opt_nodcache: 250 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 251 break; 252 case Opt_ino32: 253 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 254 break; 255 case Opt_noino32: 256 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 257 break; 258 default: 259 BUG_ON(token); 260 } 261 return 0; 262 } 263 264 static void destroy_mount_options(struct ceph_mount_options *args) 265 { 266 dout("destroy_mount_options %p\n", args); 267 kfree(args->snapdir_name); 268 kfree(args); 269 } 270 271 static int strcmp_null(const char *s1, const char *s2) 272 { 273 if (!s1 && !s2) 274 return 0; 275 if (s1 && !s2) 276 return -1; 277 if (!s1 && s2) 278 return 1; 279 return strcmp(s1, s2); 280 } 281 282 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 283 struct ceph_options *new_opt, 284 struct ceph_fs_client *fsc) 285 { 286 struct ceph_mount_options *fsopt1 = new_fsopt; 287 struct ceph_mount_options *fsopt2 = fsc->mount_options; 288 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 289 int ret; 290 291 ret = memcmp(fsopt1, fsopt2, ofs); 292 if (ret) 293 return ret; 294 295 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 296 if (ret) 297 return ret; 298 299 return ceph_compare_options(new_opt, fsc->client); 300 } 301 302 static int parse_mount_options(struct ceph_mount_options **pfsopt, 303 struct ceph_options **popt, 304 int flags, char *options, 305 const char *dev_name, 306 const char **path) 307 { 308 struct ceph_mount_options *fsopt; 309 const char *dev_name_end; 310 int err; 311 312 if (!dev_name || !*dev_name) 313 return -EINVAL; 314 315 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 316 if (!fsopt) 317 return -ENOMEM; 318 319 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 320 321 fsopt->sb_flags = flags; 322 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 323 324 fsopt->rsize = CEPH_RSIZE_DEFAULT; 325 fsopt->rasize = CEPH_RASIZE_DEFAULT; 326 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 327 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 328 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 329 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 330 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 331 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 332 fsopt->congestion_kb = default_congestion_kb(); 333 334 /* 335 * Distinguish the server list from the path in "dev_name". 336 * Internally we do not include the leading '/' in the path. 337 * 338 * "dev_name" will look like: 339 * <server_spec>[,<server_spec>...]:[<path>] 340 * where 341 * <server_spec> is <ip>[:<port>] 342 * <path> is optional, but if present must begin with '/' 343 */ 344 dev_name_end = strchr(dev_name, '/'); 345 if (dev_name_end) { 346 /* skip over leading '/' for path */ 347 *path = dev_name_end + 1; 348 } else { 349 /* path is empty */ 350 dev_name_end = dev_name + strlen(dev_name); 351 *path = dev_name_end; 352 } 353 err = -EINVAL; 354 dev_name_end--; /* back up to ':' separator */ 355 if (*dev_name_end != ':') { 356 pr_err("device name is missing path (no : separator in %s)\n", 357 dev_name); 358 goto out; 359 } 360 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 361 dout("server path '%s'\n", *path); 362 363 *popt = ceph_parse_options(options, dev_name, dev_name_end, 364 parse_fsopt_token, (void *)fsopt); 365 if (IS_ERR(*popt)) { 366 err = PTR_ERR(*popt); 367 goto out; 368 } 369 370 /* success */ 371 *pfsopt = fsopt; 372 return 0; 373 374 out: 375 destroy_mount_options(fsopt); 376 return err; 377 } 378 379 /** 380 * ceph_show_options - Show mount options in /proc/mounts 381 * @m: seq_file to write to 382 * @root: root of that (sub)tree 383 */ 384 static int ceph_show_options(struct seq_file *m, struct dentry *root) 385 { 386 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 387 struct ceph_mount_options *fsopt = fsc->mount_options; 388 struct ceph_options *opt = fsc->client->options; 389 390 if (opt->flags & CEPH_OPT_FSID) 391 seq_printf(m, ",fsid=%pU", &opt->fsid); 392 if (opt->flags & CEPH_OPT_NOSHARE) 393 seq_puts(m, ",noshare"); 394 if (opt->flags & CEPH_OPT_NOCRC) 395 seq_puts(m, ",nocrc"); 396 397 if (opt->name) 398 seq_printf(m, ",name=%s", opt->name); 399 if (opt->key) 400 seq_puts(m, ",secret=<hidden>"); 401 402 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 403 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 404 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 405 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 406 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 407 seq_printf(m, ",osdkeepalivetimeout=%d", 408 opt->osd_keepalive_timeout); 409 410 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 411 seq_puts(m, ",dirstat"); 412 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 413 seq_puts(m, ",norbytes"); 414 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 415 seq_puts(m, ",noasyncreaddir"); 416 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 417 seq_puts(m, ",dcache"); 418 else 419 seq_puts(m, ",nodcache"); 420 421 if (fsopt->wsize) 422 seq_printf(m, ",wsize=%d", fsopt->wsize); 423 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 424 seq_printf(m, ",rsize=%d", fsopt->rsize); 425 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 426 seq_printf(m, ",rasize=%d", fsopt->rasize); 427 if (fsopt->congestion_kb != default_congestion_kb()) 428 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 429 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 430 seq_printf(m, ",caps_wanted_delay_min=%d", 431 fsopt->caps_wanted_delay_min); 432 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 433 seq_printf(m, ",caps_wanted_delay_max=%d", 434 fsopt->caps_wanted_delay_max); 435 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 436 seq_printf(m, ",cap_release_safety=%d", 437 fsopt->cap_release_safety); 438 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 439 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 440 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 441 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 442 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 443 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 444 return 0; 445 } 446 447 /* 448 * handle any mon messages the standard library doesn't understand. 449 * return error if we don't either. 450 */ 451 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 452 { 453 struct ceph_fs_client *fsc = client->private; 454 int type = le16_to_cpu(msg->hdr.type); 455 456 switch (type) { 457 case CEPH_MSG_MDS_MAP: 458 ceph_mdsc_handle_map(fsc->mdsc, msg); 459 return 0; 460 461 default: 462 return -1; 463 } 464 } 465 466 /* 467 * create a new fs client 468 */ 469 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 470 struct ceph_options *opt) 471 { 472 struct ceph_fs_client *fsc; 473 const unsigned supported_features = 474 CEPH_FEATURE_FLOCK | 475 CEPH_FEATURE_DIRLAYOUTHASH; 476 const unsigned required_features = 0; 477 int err = -ENOMEM; 478 479 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 480 if (!fsc) 481 return ERR_PTR(-ENOMEM); 482 483 fsc->client = ceph_create_client(opt, fsc, supported_features, 484 required_features); 485 if (IS_ERR(fsc->client)) { 486 err = PTR_ERR(fsc->client); 487 goto fail; 488 } 489 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 490 fsc->client->monc.want_mdsmap = 1; 491 492 fsc->mount_options = fsopt; 493 494 fsc->sb = NULL; 495 fsc->mount_state = CEPH_MOUNT_MOUNTING; 496 497 atomic_long_set(&fsc->writeback_count, 0); 498 499 err = bdi_init(&fsc->backing_dev_info); 500 if (err < 0) 501 goto fail_client; 502 503 err = -ENOMEM; 504 /* 505 * The number of concurrent works can be high but they don't need 506 * to be processed in parallel, limit concurrency. 507 */ 508 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 509 if (fsc->wb_wq == NULL) 510 goto fail_bdi; 511 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 512 if (fsc->pg_inv_wq == NULL) 513 goto fail_wb_wq; 514 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 515 if (fsc->trunc_wq == NULL) 516 goto fail_pg_inv_wq; 517 518 /* set up mempools */ 519 err = -ENOMEM; 520 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 521 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); 522 if (!fsc->wb_pagevec_pool) 523 goto fail_trunc_wq; 524 525 /* caps */ 526 fsc->min_caps = fsopt->max_readdir; 527 528 return fsc; 529 530 fail_trunc_wq: 531 destroy_workqueue(fsc->trunc_wq); 532 fail_pg_inv_wq: 533 destroy_workqueue(fsc->pg_inv_wq); 534 fail_wb_wq: 535 destroy_workqueue(fsc->wb_wq); 536 fail_bdi: 537 bdi_destroy(&fsc->backing_dev_info); 538 fail_client: 539 ceph_destroy_client(fsc->client); 540 fail: 541 kfree(fsc); 542 return ERR_PTR(err); 543 } 544 545 static void destroy_fs_client(struct ceph_fs_client *fsc) 546 { 547 dout("destroy_fs_client %p\n", fsc); 548 549 destroy_workqueue(fsc->wb_wq); 550 destroy_workqueue(fsc->pg_inv_wq); 551 destroy_workqueue(fsc->trunc_wq); 552 553 bdi_destroy(&fsc->backing_dev_info); 554 555 mempool_destroy(fsc->wb_pagevec_pool); 556 557 destroy_mount_options(fsc->mount_options); 558 559 ceph_fs_debugfs_cleanup(fsc); 560 561 ceph_destroy_client(fsc->client); 562 563 kfree(fsc); 564 dout("destroy_fs_client %p done\n", fsc); 565 } 566 567 /* 568 * caches 569 */ 570 struct kmem_cache *ceph_inode_cachep; 571 struct kmem_cache *ceph_cap_cachep; 572 struct kmem_cache *ceph_dentry_cachep; 573 struct kmem_cache *ceph_file_cachep; 574 575 static void ceph_inode_init_once(void *foo) 576 { 577 struct ceph_inode_info *ci = foo; 578 inode_init_once(&ci->vfs_inode); 579 } 580 581 static int __init init_caches(void) 582 { 583 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 584 sizeof(struct ceph_inode_info), 585 __alignof__(struct ceph_inode_info), 586 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 587 ceph_inode_init_once); 588 if (ceph_inode_cachep == NULL) 589 return -ENOMEM; 590 591 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 592 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 593 if (ceph_cap_cachep == NULL) 594 goto bad_cap; 595 596 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 597 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 598 if (ceph_dentry_cachep == NULL) 599 goto bad_dentry; 600 601 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 602 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 603 if (ceph_file_cachep == NULL) 604 goto bad_file; 605 606 return 0; 607 608 bad_file: 609 kmem_cache_destroy(ceph_dentry_cachep); 610 bad_dentry: 611 kmem_cache_destroy(ceph_cap_cachep); 612 bad_cap: 613 kmem_cache_destroy(ceph_inode_cachep); 614 return -ENOMEM; 615 } 616 617 static void destroy_caches(void) 618 { 619 /* 620 * Make sure all delayed rcu free inodes are flushed before we 621 * destroy cache. 622 */ 623 rcu_barrier(); 624 kmem_cache_destroy(ceph_inode_cachep); 625 kmem_cache_destroy(ceph_cap_cachep); 626 kmem_cache_destroy(ceph_dentry_cachep); 627 kmem_cache_destroy(ceph_file_cachep); 628 } 629 630 631 /* 632 * ceph_umount_begin - initiate forced umount. Tear down down the 633 * mount, skipping steps that may hang while waiting for server(s). 634 */ 635 static void ceph_umount_begin(struct super_block *sb) 636 { 637 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 638 639 dout("ceph_umount_begin - starting forced umount\n"); 640 if (!fsc) 641 return; 642 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 643 return; 644 } 645 646 static const struct super_operations ceph_super_ops = { 647 .alloc_inode = ceph_alloc_inode, 648 .destroy_inode = ceph_destroy_inode, 649 .write_inode = ceph_write_inode, 650 .sync_fs = ceph_sync_fs, 651 .put_super = ceph_put_super, 652 .show_options = ceph_show_options, 653 .statfs = ceph_statfs, 654 .umount_begin = ceph_umount_begin, 655 }; 656 657 /* 658 * Bootstrap mount by opening the root directory. Note the mount 659 * @started time from caller, and time out if this takes too long. 660 */ 661 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 662 const char *path, 663 unsigned long started) 664 { 665 struct ceph_mds_client *mdsc = fsc->mdsc; 666 struct ceph_mds_request *req = NULL; 667 int err; 668 struct dentry *root; 669 670 /* open dir */ 671 dout("open_root_inode opening '%s'\n", path); 672 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 673 if (IS_ERR(req)) 674 return ERR_CAST(req); 675 req->r_path1 = kstrdup(path, GFP_NOFS); 676 req->r_ino1.ino = CEPH_INO_ROOT; 677 req->r_ino1.snap = CEPH_NOSNAP; 678 req->r_started = started; 679 req->r_timeout = fsc->client->options->mount_timeout * HZ; 680 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 681 req->r_num_caps = 2; 682 err = ceph_mdsc_do_request(mdsc, NULL, req); 683 if (err == 0) { 684 struct inode *inode = req->r_target_inode; 685 req->r_target_inode = NULL; 686 dout("open_root_inode success\n"); 687 if (ceph_ino(inode) == CEPH_INO_ROOT && 688 fsc->sb->s_root == NULL) { 689 root = d_make_root(inode); 690 if (!root) { 691 root = ERR_PTR(-ENOMEM); 692 goto out; 693 } 694 } else { 695 root = d_obtain_alias(inode); 696 } 697 ceph_init_dentry(root); 698 dout("open_root_inode success, root dentry is %p\n", root); 699 } else { 700 root = ERR_PTR(err); 701 } 702 out: 703 ceph_mdsc_put_request(req); 704 return root; 705 } 706 707 708 709 710 /* 711 * mount: join the ceph cluster, and open root directory. 712 */ 713 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 714 const char *path) 715 { 716 int err; 717 unsigned long started = jiffies; /* note the start time */ 718 struct dentry *root; 719 int first = 0; /* first vfsmount for this super_block */ 720 721 dout("mount start\n"); 722 mutex_lock(&fsc->client->mount_mutex); 723 724 err = __ceph_open_session(fsc->client, started); 725 if (err < 0) 726 goto out; 727 728 dout("mount opening root\n"); 729 root = open_root_dentry(fsc, "", started); 730 if (IS_ERR(root)) { 731 err = PTR_ERR(root); 732 goto out; 733 } 734 if (fsc->sb->s_root) { 735 dput(root); 736 } else { 737 fsc->sb->s_root = root; 738 first = 1; 739 740 err = ceph_fs_debugfs_init(fsc); 741 if (err < 0) 742 goto fail; 743 } 744 745 if (path[0] == 0) { 746 dget(root); 747 } else { 748 dout("mount opening base mountpoint\n"); 749 root = open_root_dentry(fsc, path, started); 750 if (IS_ERR(root)) { 751 err = PTR_ERR(root); 752 goto fail; 753 } 754 } 755 756 fsc->mount_state = CEPH_MOUNT_MOUNTED; 757 dout("mount success\n"); 758 mutex_unlock(&fsc->client->mount_mutex); 759 return root; 760 761 out: 762 mutex_unlock(&fsc->client->mount_mutex); 763 return ERR_PTR(err); 764 765 fail: 766 if (first) { 767 dput(fsc->sb->s_root); 768 fsc->sb->s_root = NULL; 769 } 770 goto out; 771 } 772 773 static int ceph_set_super(struct super_block *s, void *data) 774 { 775 struct ceph_fs_client *fsc = data; 776 int ret; 777 778 dout("set_super %p data %p\n", s, data); 779 780 s->s_flags = fsc->mount_options->sb_flags; 781 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 782 783 s->s_fs_info = fsc; 784 fsc->sb = s; 785 786 s->s_op = &ceph_super_ops; 787 s->s_export_op = &ceph_export_ops; 788 789 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 790 791 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 792 if (ret != 0) 793 goto fail; 794 795 return ret; 796 797 fail: 798 s->s_fs_info = NULL; 799 fsc->sb = NULL; 800 return ret; 801 } 802 803 /* 804 * share superblock if same fs AND options 805 */ 806 static int ceph_compare_super(struct super_block *sb, void *data) 807 { 808 struct ceph_fs_client *new = data; 809 struct ceph_mount_options *fsopt = new->mount_options; 810 struct ceph_options *opt = new->client->options; 811 struct ceph_fs_client *other = ceph_sb_to_client(sb); 812 813 dout("ceph_compare_super %p\n", sb); 814 815 if (compare_mount_options(fsopt, opt, other)) { 816 dout("monitor(s)/mount options don't match\n"); 817 return 0; 818 } 819 if ((opt->flags & CEPH_OPT_FSID) && 820 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 821 dout("fsid doesn't match\n"); 822 return 0; 823 } 824 if (fsopt->sb_flags != other->mount_options->sb_flags) { 825 dout("flags differ\n"); 826 return 0; 827 } 828 return 1; 829 } 830 831 /* 832 * construct our own bdi so we can control readahead, etc. 833 */ 834 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 835 836 static int ceph_register_bdi(struct super_block *sb, 837 struct ceph_fs_client *fsc) 838 { 839 int err; 840 841 /* set ra_pages based on rasize mount option? */ 842 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 843 fsc->backing_dev_info.ra_pages = 844 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 845 >> PAGE_SHIFT; 846 else 847 fsc->backing_dev_info.ra_pages = 848 default_backing_dev_info.ra_pages; 849 850 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 851 atomic_long_inc_return(&bdi_seq)); 852 if (!err) 853 sb->s_bdi = &fsc->backing_dev_info; 854 return err; 855 } 856 857 static struct dentry *ceph_mount(struct file_system_type *fs_type, 858 int flags, const char *dev_name, void *data) 859 { 860 struct super_block *sb; 861 struct ceph_fs_client *fsc; 862 struct dentry *res; 863 int err; 864 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 865 const char *path = NULL; 866 struct ceph_mount_options *fsopt = NULL; 867 struct ceph_options *opt = NULL; 868 869 dout("ceph_mount\n"); 870 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 871 if (err < 0) { 872 res = ERR_PTR(err); 873 goto out_final; 874 } 875 876 /* create client (which we may/may not use) */ 877 fsc = create_fs_client(fsopt, opt); 878 if (IS_ERR(fsc)) { 879 res = ERR_CAST(fsc); 880 destroy_mount_options(fsopt); 881 ceph_destroy_options(opt); 882 goto out_final; 883 } 884 885 err = ceph_mdsc_init(fsc); 886 if (err < 0) { 887 res = ERR_PTR(err); 888 goto out; 889 } 890 891 if (ceph_test_opt(fsc->client, NOSHARE)) 892 compare_super = NULL; 893 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 894 if (IS_ERR(sb)) { 895 res = ERR_CAST(sb); 896 goto out; 897 } 898 899 if (ceph_sb_to_client(sb) != fsc) { 900 ceph_mdsc_destroy(fsc); 901 destroy_fs_client(fsc); 902 fsc = ceph_sb_to_client(sb); 903 dout("get_sb got existing client %p\n", fsc); 904 } else { 905 dout("get_sb using new client %p\n", fsc); 906 err = ceph_register_bdi(sb, fsc); 907 if (err < 0) { 908 res = ERR_PTR(err); 909 goto out_splat; 910 } 911 } 912 913 res = ceph_real_mount(fsc, path); 914 if (IS_ERR(res)) 915 goto out_splat; 916 dout("root %p inode %p ino %llx.%llx\n", res, 917 res->d_inode, ceph_vinop(res->d_inode)); 918 return res; 919 920 out_splat: 921 ceph_mdsc_close_sessions(fsc->mdsc); 922 deactivate_locked_super(sb); 923 goto out_final; 924 925 out: 926 ceph_mdsc_destroy(fsc); 927 destroy_fs_client(fsc); 928 out_final: 929 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 930 return res; 931 } 932 933 static void ceph_kill_sb(struct super_block *s) 934 { 935 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 936 dout("kill_sb %p\n", s); 937 ceph_mdsc_pre_umount(fsc->mdsc); 938 kill_anon_super(s); /* will call put_super after sb is r/o */ 939 ceph_mdsc_destroy(fsc); 940 destroy_fs_client(fsc); 941 } 942 943 static struct file_system_type ceph_fs_type = { 944 .owner = THIS_MODULE, 945 .name = "ceph", 946 .mount = ceph_mount, 947 .kill_sb = ceph_kill_sb, 948 .fs_flags = FS_RENAME_DOES_D_MOVE, 949 }; 950 951 #define _STRINGIFY(x) #x 952 #define STRINGIFY(x) _STRINGIFY(x) 953 954 static int __init init_ceph(void) 955 { 956 int ret = init_caches(); 957 if (ret) 958 goto out; 959 960 ceph_xattr_init(); 961 ret = register_filesystem(&ceph_fs_type); 962 if (ret) 963 goto out_icache; 964 965 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 966 967 return 0; 968 969 out_icache: 970 ceph_xattr_exit(); 971 destroy_caches(); 972 out: 973 return ret; 974 } 975 976 static void __exit exit_ceph(void) 977 { 978 dout("exit_ceph\n"); 979 unregister_filesystem(&ceph_fs_type); 980 ceph_xattr_exit(); 981 destroy_caches(); 982 } 983 984 module_init(init_ceph); 985 module_exit(exit_ceph); 986 987 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 988 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 989 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 990 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 991 MODULE_LICENSE("GPL"); 992