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 #include "cache.h" 21 22 #include <linux/ceph/ceph_features.h> 23 #include <linux/ceph/decode.h> 24 #include <linux/ceph/mon_client.h> 25 #include <linux/ceph/auth.h> 26 #include <linux/ceph/debugfs.h> 27 28 /* 29 * Ceph superblock operations 30 * 31 * Handle the basics of mounting, unmounting. 32 */ 33 34 /* 35 * super ops 36 */ 37 static void ceph_put_super(struct super_block *s) 38 { 39 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 40 41 dout("put_super\n"); 42 ceph_mdsc_close_sessions(fsc->mdsc); 43 44 /* 45 * ensure we release the bdi before put_anon_super releases 46 * the device name. 47 */ 48 if (s->s_bdi == &fsc->backing_dev_info) { 49 bdi_unregister(&fsc->backing_dev_info); 50 s->s_bdi = NULL; 51 } 52 53 return; 54 } 55 56 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 57 { 58 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode); 59 struct ceph_monmap *monmap = fsc->client->monc.monmap; 60 struct ceph_statfs st; 61 u64 fsid; 62 int err; 63 64 dout("statfs\n"); 65 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 66 if (err < 0) 67 return err; 68 69 /* fill in kstatfs */ 70 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 71 72 /* 73 * express utilization in terms of large blocks to avoid 74 * overflow on 32-bit machines. 75 * 76 * NOTE: for the time being, we make bsize == frsize to humor 77 * not-yet-ancient versions of glibc that are broken. 78 * Someday, we will probably want to report a real block 79 * size... whatever that may mean for a network file system! 80 */ 81 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 82 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 83 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 84 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 85 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 86 87 buf->f_files = le64_to_cpu(st.num_objects); 88 buf->f_ffree = -1; 89 buf->f_namelen = NAME_MAX; 90 91 /* leave fsid little-endian, regardless of host endianness */ 92 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 93 buf->f_fsid.val[0] = fsid & 0xffffffff; 94 buf->f_fsid.val[1] = fsid >> 32; 95 96 return 0; 97 } 98 99 100 static int ceph_sync_fs(struct super_block *sb, int wait) 101 { 102 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 103 104 if (!wait) { 105 dout("sync_fs (non-blocking)\n"); 106 ceph_flush_dirty_caps(fsc->mdsc); 107 dout("sync_fs (non-blocking) done\n"); 108 return 0; 109 } 110 111 dout("sync_fs (blocking)\n"); 112 ceph_osdc_sync(&fsc->client->osdc); 113 ceph_mdsc_sync(fsc->mdsc); 114 dout("sync_fs (blocking) done\n"); 115 return 0; 116 } 117 118 /* 119 * mount options 120 */ 121 enum { 122 Opt_wsize, 123 Opt_rsize, 124 Opt_rasize, 125 Opt_caps_wanted_delay_min, 126 Opt_caps_wanted_delay_max, 127 Opt_cap_release_safety, 128 Opt_readdir_max_entries, 129 Opt_readdir_max_bytes, 130 Opt_congestion_kb, 131 Opt_last_int, 132 /* int args above */ 133 Opt_snapdirname, 134 Opt_last_string, 135 /* string args above */ 136 Opt_dirstat, 137 Opt_nodirstat, 138 Opt_rbytes, 139 Opt_norbytes, 140 Opt_asyncreaddir, 141 Opt_noasyncreaddir, 142 Opt_dcache, 143 Opt_nodcache, 144 Opt_ino32, 145 Opt_noino32, 146 Opt_fscache, 147 Opt_nofscache 148 }; 149 150 static match_table_t fsopt_tokens = { 151 {Opt_wsize, "wsize=%d"}, 152 {Opt_rsize, "rsize=%d"}, 153 {Opt_rasize, "rasize=%d"}, 154 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 155 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 156 {Opt_cap_release_safety, "cap_release_safety=%d"}, 157 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 158 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 159 {Opt_congestion_kb, "write_congestion_kb=%d"}, 160 /* int args above */ 161 {Opt_snapdirname, "snapdirname=%s"}, 162 /* string args above */ 163 {Opt_dirstat, "dirstat"}, 164 {Opt_nodirstat, "nodirstat"}, 165 {Opt_rbytes, "rbytes"}, 166 {Opt_norbytes, "norbytes"}, 167 {Opt_asyncreaddir, "asyncreaddir"}, 168 {Opt_noasyncreaddir, "noasyncreaddir"}, 169 {Opt_dcache, "dcache"}, 170 {Opt_nodcache, "nodcache"}, 171 {Opt_ino32, "ino32"}, 172 {Opt_noino32, "noino32"}, 173 {Opt_fscache, "fsc"}, 174 {Opt_nofscache, "nofsc"}, 175 {-1, NULL} 176 }; 177 178 static int parse_fsopt_token(char *c, void *private) 179 { 180 struct ceph_mount_options *fsopt = private; 181 substring_t argstr[MAX_OPT_ARGS]; 182 int token, intval, ret; 183 184 token = match_token((char *)c, fsopt_tokens, argstr); 185 if (token < 0) 186 return -EINVAL; 187 188 if (token < Opt_last_int) { 189 ret = match_int(&argstr[0], &intval); 190 if (ret < 0) { 191 pr_err("bad mount option arg (not int) " 192 "at '%s'\n", c); 193 return ret; 194 } 195 dout("got int token %d val %d\n", token, intval); 196 } else if (token > Opt_last_int && token < Opt_last_string) { 197 dout("got string token %d val %s\n", token, 198 argstr[0].from); 199 } else { 200 dout("got token %d\n", token); 201 } 202 203 switch (token) { 204 case Opt_snapdirname: 205 kfree(fsopt->snapdir_name); 206 fsopt->snapdir_name = kstrndup(argstr[0].from, 207 argstr[0].to-argstr[0].from, 208 GFP_KERNEL); 209 if (!fsopt->snapdir_name) 210 return -ENOMEM; 211 break; 212 213 /* misc */ 214 case Opt_wsize: 215 fsopt->wsize = intval; 216 break; 217 case Opt_rsize: 218 fsopt->rsize = intval; 219 break; 220 case Opt_rasize: 221 fsopt->rasize = intval; 222 break; 223 case Opt_caps_wanted_delay_min: 224 fsopt->caps_wanted_delay_min = intval; 225 break; 226 case Opt_caps_wanted_delay_max: 227 fsopt->caps_wanted_delay_max = intval; 228 break; 229 case Opt_readdir_max_entries: 230 fsopt->max_readdir = intval; 231 break; 232 case Opt_readdir_max_bytes: 233 fsopt->max_readdir_bytes = intval; 234 break; 235 case Opt_congestion_kb: 236 fsopt->congestion_kb = intval; 237 break; 238 case Opt_dirstat: 239 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 240 break; 241 case Opt_nodirstat: 242 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 243 break; 244 case Opt_rbytes: 245 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 246 break; 247 case Opt_norbytes: 248 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 249 break; 250 case Opt_asyncreaddir: 251 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 252 break; 253 case Opt_noasyncreaddir: 254 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 255 break; 256 case Opt_dcache: 257 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 258 break; 259 case Opt_nodcache: 260 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 261 break; 262 case Opt_ino32: 263 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 264 break; 265 case Opt_noino32: 266 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 267 break; 268 case Opt_fscache: 269 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 270 break; 271 case Opt_nofscache: 272 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 273 break; 274 default: 275 BUG_ON(token); 276 } 277 return 0; 278 } 279 280 static void destroy_mount_options(struct ceph_mount_options *args) 281 { 282 dout("destroy_mount_options %p\n", args); 283 kfree(args->snapdir_name); 284 kfree(args); 285 } 286 287 static int strcmp_null(const char *s1, const char *s2) 288 { 289 if (!s1 && !s2) 290 return 0; 291 if (s1 && !s2) 292 return -1; 293 if (!s1 && s2) 294 return 1; 295 return strcmp(s1, s2); 296 } 297 298 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 299 struct ceph_options *new_opt, 300 struct ceph_fs_client *fsc) 301 { 302 struct ceph_mount_options *fsopt1 = new_fsopt; 303 struct ceph_mount_options *fsopt2 = fsc->mount_options; 304 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 305 int ret; 306 307 ret = memcmp(fsopt1, fsopt2, ofs); 308 if (ret) 309 return ret; 310 311 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 312 if (ret) 313 return ret; 314 315 return ceph_compare_options(new_opt, fsc->client); 316 } 317 318 static int parse_mount_options(struct ceph_mount_options **pfsopt, 319 struct ceph_options **popt, 320 int flags, char *options, 321 const char *dev_name, 322 const char **path) 323 { 324 struct ceph_mount_options *fsopt; 325 const char *dev_name_end; 326 int err; 327 328 if (!dev_name || !*dev_name) 329 return -EINVAL; 330 331 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 332 if (!fsopt) 333 return -ENOMEM; 334 335 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 336 337 fsopt->sb_flags = flags; 338 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 339 340 fsopt->rsize = CEPH_RSIZE_DEFAULT; 341 fsopt->rasize = CEPH_RASIZE_DEFAULT; 342 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 343 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 344 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 345 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 346 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 347 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 348 fsopt->congestion_kb = default_congestion_kb(); 349 350 /* 351 * Distinguish the server list from the path in "dev_name". 352 * Internally we do not include the leading '/' in the path. 353 * 354 * "dev_name" will look like: 355 * <server_spec>[,<server_spec>...]:[<path>] 356 * where 357 * <server_spec> is <ip>[:<port>] 358 * <path> is optional, but if present must begin with '/' 359 */ 360 dev_name_end = strchr(dev_name, '/'); 361 if (dev_name_end) { 362 /* skip over leading '/' for path */ 363 *path = dev_name_end + 1; 364 } else { 365 /* path is empty */ 366 dev_name_end = dev_name + strlen(dev_name); 367 *path = dev_name_end; 368 } 369 err = -EINVAL; 370 dev_name_end--; /* back up to ':' separator */ 371 if (dev_name_end < dev_name || *dev_name_end != ':') { 372 pr_err("device name is missing path (no : separator in %s)\n", 373 dev_name); 374 goto out; 375 } 376 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 377 dout("server path '%s'\n", *path); 378 379 *popt = ceph_parse_options(options, dev_name, dev_name_end, 380 parse_fsopt_token, (void *)fsopt); 381 if (IS_ERR(*popt)) { 382 err = PTR_ERR(*popt); 383 goto out; 384 } 385 386 /* success */ 387 *pfsopt = fsopt; 388 return 0; 389 390 out: 391 destroy_mount_options(fsopt); 392 return err; 393 } 394 395 /** 396 * ceph_show_options - Show mount options in /proc/mounts 397 * @m: seq_file to write to 398 * @root: root of that (sub)tree 399 */ 400 static int ceph_show_options(struct seq_file *m, struct dentry *root) 401 { 402 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 403 struct ceph_mount_options *fsopt = fsc->mount_options; 404 struct ceph_options *opt = fsc->client->options; 405 406 if (opt->flags & CEPH_OPT_FSID) 407 seq_printf(m, ",fsid=%pU", &opt->fsid); 408 if (opt->flags & CEPH_OPT_NOSHARE) 409 seq_puts(m, ",noshare"); 410 if (opt->flags & CEPH_OPT_NOCRC) 411 seq_puts(m, ",nocrc"); 412 413 if (opt->name) 414 seq_printf(m, ",name=%s", opt->name); 415 if (opt->key) 416 seq_puts(m, ",secret=<hidden>"); 417 418 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 419 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 420 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 421 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 422 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 423 seq_printf(m, ",osdkeepalivetimeout=%d", 424 opt->osd_keepalive_timeout); 425 426 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 427 seq_puts(m, ",dirstat"); 428 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 429 seq_puts(m, ",norbytes"); 430 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 431 seq_puts(m, ",noasyncreaddir"); 432 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 433 seq_puts(m, ",dcache"); 434 else 435 seq_puts(m, ",nodcache"); 436 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 437 seq_puts(m, ",fsc"); 438 else 439 seq_puts(m, ",nofsc"); 440 441 if (fsopt->wsize) 442 seq_printf(m, ",wsize=%d", fsopt->wsize); 443 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 444 seq_printf(m, ",rsize=%d", fsopt->rsize); 445 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 446 seq_printf(m, ",rasize=%d", fsopt->rasize); 447 if (fsopt->congestion_kb != default_congestion_kb()) 448 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 449 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 450 seq_printf(m, ",caps_wanted_delay_min=%d", 451 fsopt->caps_wanted_delay_min); 452 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 453 seq_printf(m, ",caps_wanted_delay_max=%d", 454 fsopt->caps_wanted_delay_max); 455 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 456 seq_printf(m, ",cap_release_safety=%d", 457 fsopt->cap_release_safety); 458 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 459 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 460 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 461 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 462 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 463 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 464 return 0; 465 } 466 467 /* 468 * handle any mon messages the standard library doesn't understand. 469 * return error if we don't either. 470 */ 471 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 472 { 473 struct ceph_fs_client *fsc = client->private; 474 int type = le16_to_cpu(msg->hdr.type); 475 476 switch (type) { 477 case CEPH_MSG_MDS_MAP: 478 ceph_mdsc_handle_map(fsc->mdsc, msg); 479 return 0; 480 481 default: 482 return -1; 483 } 484 } 485 486 /* 487 * create a new fs client 488 */ 489 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 490 struct ceph_options *opt) 491 { 492 struct ceph_fs_client *fsc; 493 const unsigned supported_features = 494 CEPH_FEATURE_FLOCK | 495 CEPH_FEATURE_DIRLAYOUTHASH; 496 const unsigned required_features = 0; 497 int page_count; 498 size_t size; 499 int err = -ENOMEM; 500 501 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 502 if (!fsc) 503 return ERR_PTR(-ENOMEM); 504 505 fsc->client = ceph_create_client(opt, fsc, supported_features, 506 required_features); 507 if (IS_ERR(fsc->client)) { 508 err = PTR_ERR(fsc->client); 509 goto fail; 510 } 511 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 512 fsc->client->monc.want_mdsmap = 1; 513 514 fsc->mount_options = fsopt; 515 516 fsc->sb = NULL; 517 fsc->mount_state = CEPH_MOUNT_MOUNTING; 518 519 atomic_long_set(&fsc->writeback_count, 0); 520 521 err = bdi_init(&fsc->backing_dev_info); 522 if (err < 0) 523 goto fail_client; 524 525 err = -ENOMEM; 526 /* 527 * The number of concurrent works can be high but they don't need 528 * to be processed in parallel, limit concurrency. 529 */ 530 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 531 if (fsc->wb_wq == NULL) 532 goto fail_bdi; 533 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 534 if (fsc->pg_inv_wq == NULL) 535 goto fail_wb_wq; 536 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 537 if (fsc->trunc_wq == NULL) 538 goto fail_pg_inv_wq; 539 540 /* set up mempools */ 541 err = -ENOMEM; 542 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 543 size = sizeof (struct page *) * (page_count ? page_count : 1); 544 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 545 if (!fsc->wb_pagevec_pool) 546 goto fail_trunc_wq; 547 548 /* setup fscache */ 549 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 550 (ceph_fscache_register_fs(fsc) != 0)) 551 goto fail_fscache; 552 553 /* caps */ 554 fsc->min_caps = fsopt->max_readdir; 555 556 return fsc; 557 558 fail_fscache: 559 ceph_fscache_unregister_fs(fsc); 560 fail_trunc_wq: 561 destroy_workqueue(fsc->trunc_wq); 562 fail_pg_inv_wq: 563 destroy_workqueue(fsc->pg_inv_wq); 564 fail_wb_wq: 565 destroy_workqueue(fsc->wb_wq); 566 fail_bdi: 567 bdi_destroy(&fsc->backing_dev_info); 568 fail_client: 569 ceph_destroy_client(fsc->client); 570 fail: 571 kfree(fsc); 572 return ERR_PTR(err); 573 } 574 575 static void destroy_fs_client(struct ceph_fs_client *fsc) 576 { 577 dout("destroy_fs_client %p\n", fsc); 578 579 ceph_fscache_unregister_fs(fsc); 580 581 destroy_workqueue(fsc->wb_wq); 582 destroy_workqueue(fsc->pg_inv_wq); 583 destroy_workqueue(fsc->trunc_wq); 584 585 bdi_destroy(&fsc->backing_dev_info); 586 587 mempool_destroy(fsc->wb_pagevec_pool); 588 589 destroy_mount_options(fsc->mount_options); 590 591 ceph_fs_debugfs_cleanup(fsc); 592 593 ceph_destroy_client(fsc->client); 594 595 kfree(fsc); 596 dout("destroy_fs_client %p done\n", fsc); 597 } 598 599 /* 600 * caches 601 */ 602 struct kmem_cache *ceph_inode_cachep; 603 struct kmem_cache *ceph_cap_cachep; 604 struct kmem_cache *ceph_dentry_cachep; 605 struct kmem_cache *ceph_file_cachep; 606 607 static void ceph_inode_init_once(void *foo) 608 { 609 struct ceph_inode_info *ci = foo; 610 inode_init_once(&ci->vfs_inode); 611 } 612 613 static int __init init_caches(void) 614 { 615 int error = -ENOMEM; 616 617 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 618 sizeof(struct ceph_inode_info), 619 __alignof__(struct ceph_inode_info), 620 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 621 ceph_inode_init_once); 622 if (ceph_inode_cachep == NULL) 623 return -ENOMEM; 624 625 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 626 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 627 if (ceph_cap_cachep == NULL) 628 goto bad_cap; 629 630 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 631 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 632 if (ceph_dentry_cachep == NULL) 633 goto bad_dentry; 634 635 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 636 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 637 if (ceph_file_cachep == NULL) 638 goto bad_file; 639 640 if ((error = ceph_fscache_register())) 641 goto bad_file; 642 643 return 0; 644 bad_file: 645 kmem_cache_destroy(ceph_dentry_cachep); 646 bad_dentry: 647 kmem_cache_destroy(ceph_cap_cachep); 648 bad_cap: 649 kmem_cache_destroy(ceph_inode_cachep); 650 return error; 651 } 652 653 static void destroy_caches(void) 654 { 655 /* 656 * Make sure all delayed rcu free inodes are flushed before we 657 * destroy cache. 658 */ 659 rcu_barrier(); 660 661 kmem_cache_destroy(ceph_inode_cachep); 662 kmem_cache_destroy(ceph_cap_cachep); 663 kmem_cache_destroy(ceph_dentry_cachep); 664 kmem_cache_destroy(ceph_file_cachep); 665 666 ceph_fscache_unregister(); 667 } 668 669 670 /* 671 * ceph_umount_begin - initiate forced umount. Tear down down the 672 * mount, skipping steps that may hang while waiting for server(s). 673 */ 674 static void ceph_umount_begin(struct super_block *sb) 675 { 676 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 677 678 dout("ceph_umount_begin - starting forced umount\n"); 679 if (!fsc) 680 return; 681 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 682 return; 683 } 684 685 static const struct super_operations ceph_super_ops = { 686 .alloc_inode = ceph_alloc_inode, 687 .destroy_inode = ceph_destroy_inode, 688 .write_inode = ceph_write_inode, 689 .sync_fs = ceph_sync_fs, 690 .put_super = ceph_put_super, 691 .show_options = ceph_show_options, 692 .statfs = ceph_statfs, 693 .umount_begin = ceph_umount_begin, 694 }; 695 696 /* 697 * Bootstrap mount by opening the root directory. Note the mount 698 * @started time from caller, and time out if this takes too long. 699 */ 700 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 701 const char *path, 702 unsigned long started) 703 { 704 struct ceph_mds_client *mdsc = fsc->mdsc; 705 struct ceph_mds_request *req = NULL; 706 int err; 707 struct dentry *root; 708 709 /* open dir */ 710 dout("open_root_inode opening '%s'\n", path); 711 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 712 if (IS_ERR(req)) 713 return ERR_CAST(req); 714 req->r_path1 = kstrdup(path, GFP_NOFS); 715 req->r_ino1.ino = CEPH_INO_ROOT; 716 req->r_ino1.snap = CEPH_NOSNAP; 717 req->r_started = started; 718 req->r_timeout = fsc->client->options->mount_timeout * HZ; 719 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 720 req->r_num_caps = 2; 721 err = ceph_mdsc_do_request(mdsc, NULL, req); 722 if (err == 0) { 723 struct inode *inode = req->r_target_inode; 724 req->r_target_inode = NULL; 725 dout("open_root_inode success\n"); 726 if (ceph_ino(inode) == CEPH_INO_ROOT && 727 fsc->sb->s_root == NULL) { 728 root = d_make_root(inode); 729 if (!root) { 730 root = ERR_PTR(-ENOMEM); 731 goto out; 732 } 733 } else { 734 root = d_obtain_alias(inode); 735 } 736 ceph_init_dentry(root); 737 dout("open_root_inode success, root dentry is %p\n", root); 738 } else { 739 root = ERR_PTR(err); 740 } 741 out: 742 ceph_mdsc_put_request(req); 743 return root; 744 } 745 746 747 748 749 /* 750 * mount: join the ceph cluster, and open root directory. 751 */ 752 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 753 const char *path) 754 { 755 int err; 756 unsigned long started = jiffies; /* note the start time */ 757 struct dentry *root; 758 int first = 0; /* first vfsmount for this super_block */ 759 760 dout("mount start\n"); 761 mutex_lock(&fsc->client->mount_mutex); 762 763 err = __ceph_open_session(fsc->client, started); 764 if (err < 0) 765 goto out; 766 767 dout("mount opening root\n"); 768 root = open_root_dentry(fsc, "", started); 769 if (IS_ERR(root)) { 770 err = PTR_ERR(root); 771 goto out; 772 } 773 if (fsc->sb->s_root) { 774 dput(root); 775 } else { 776 fsc->sb->s_root = root; 777 first = 1; 778 779 err = ceph_fs_debugfs_init(fsc); 780 if (err < 0) 781 goto fail; 782 } 783 784 if (path[0] == 0) { 785 dget(root); 786 } else { 787 dout("mount opening base mountpoint\n"); 788 root = open_root_dentry(fsc, path, started); 789 if (IS_ERR(root)) { 790 err = PTR_ERR(root); 791 goto fail; 792 } 793 } 794 795 fsc->mount_state = CEPH_MOUNT_MOUNTED; 796 dout("mount success\n"); 797 mutex_unlock(&fsc->client->mount_mutex); 798 return root; 799 800 out: 801 mutex_unlock(&fsc->client->mount_mutex); 802 return ERR_PTR(err); 803 804 fail: 805 if (first) { 806 dput(fsc->sb->s_root); 807 fsc->sb->s_root = NULL; 808 } 809 goto out; 810 } 811 812 static int ceph_set_super(struct super_block *s, void *data) 813 { 814 struct ceph_fs_client *fsc = data; 815 int ret; 816 817 dout("set_super %p data %p\n", s, data); 818 819 s->s_flags = fsc->mount_options->sb_flags; 820 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 821 822 s->s_fs_info = fsc; 823 fsc->sb = s; 824 825 s->s_op = &ceph_super_ops; 826 s->s_export_op = &ceph_export_ops; 827 828 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 829 830 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 831 if (ret != 0) 832 goto fail; 833 834 return ret; 835 836 fail: 837 s->s_fs_info = NULL; 838 fsc->sb = NULL; 839 return ret; 840 } 841 842 /* 843 * share superblock if same fs AND options 844 */ 845 static int ceph_compare_super(struct super_block *sb, void *data) 846 { 847 struct ceph_fs_client *new = data; 848 struct ceph_mount_options *fsopt = new->mount_options; 849 struct ceph_options *opt = new->client->options; 850 struct ceph_fs_client *other = ceph_sb_to_client(sb); 851 852 dout("ceph_compare_super %p\n", sb); 853 854 if (compare_mount_options(fsopt, opt, other)) { 855 dout("monitor(s)/mount options don't match\n"); 856 return 0; 857 } 858 if ((opt->flags & CEPH_OPT_FSID) && 859 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 860 dout("fsid doesn't match\n"); 861 return 0; 862 } 863 if (fsopt->sb_flags != other->mount_options->sb_flags) { 864 dout("flags differ\n"); 865 return 0; 866 } 867 return 1; 868 } 869 870 /* 871 * construct our own bdi so we can control readahead, etc. 872 */ 873 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 874 875 static int ceph_register_bdi(struct super_block *sb, 876 struct ceph_fs_client *fsc) 877 { 878 int err; 879 880 /* set ra_pages based on rasize mount option? */ 881 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 882 fsc->backing_dev_info.ra_pages = 883 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 884 >> PAGE_SHIFT; 885 else 886 fsc->backing_dev_info.ra_pages = 887 default_backing_dev_info.ra_pages; 888 889 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 890 atomic_long_inc_return(&bdi_seq)); 891 if (!err) 892 sb->s_bdi = &fsc->backing_dev_info; 893 return err; 894 } 895 896 static struct dentry *ceph_mount(struct file_system_type *fs_type, 897 int flags, const char *dev_name, void *data) 898 { 899 struct super_block *sb; 900 struct ceph_fs_client *fsc; 901 struct dentry *res; 902 int err; 903 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 904 const char *path = NULL; 905 struct ceph_mount_options *fsopt = NULL; 906 struct ceph_options *opt = NULL; 907 908 dout("ceph_mount\n"); 909 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 910 if (err < 0) { 911 res = ERR_PTR(err); 912 goto out_final; 913 } 914 915 /* create client (which we may/may not use) */ 916 fsc = create_fs_client(fsopt, opt); 917 if (IS_ERR(fsc)) { 918 res = ERR_CAST(fsc); 919 destroy_mount_options(fsopt); 920 ceph_destroy_options(opt); 921 goto out_final; 922 } 923 924 err = ceph_mdsc_init(fsc); 925 if (err < 0) { 926 res = ERR_PTR(err); 927 goto out; 928 } 929 930 if (ceph_test_opt(fsc->client, NOSHARE)) 931 compare_super = NULL; 932 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 933 if (IS_ERR(sb)) { 934 res = ERR_CAST(sb); 935 goto out; 936 } 937 938 if (ceph_sb_to_client(sb) != fsc) { 939 ceph_mdsc_destroy(fsc); 940 destroy_fs_client(fsc); 941 fsc = ceph_sb_to_client(sb); 942 dout("get_sb got existing client %p\n", fsc); 943 } else { 944 dout("get_sb using new client %p\n", fsc); 945 err = ceph_register_bdi(sb, fsc); 946 if (err < 0) { 947 res = ERR_PTR(err); 948 goto out_splat; 949 } 950 } 951 952 res = ceph_real_mount(fsc, path); 953 if (IS_ERR(res)) 954 goto out_splat; 955 dout("root %p inode %p ino %llx.%llx\n", res, 956 res->d_inode, ceph_vinop(res->d_inode)); 957 return res; 958 959 out_splat: 960 ceph_mdsc_close_sessions(fsc->mdsc); 961 deactivate_locked_super(sb); 962 goto out_final; 963 964 out: 965 ceph_mdsc_destroy(fsc); 966 destroy_fs_client(fsc); 967 out_final: 968 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 969 return res; 970 } 971 972 static void ceph_kill_sb(struct super_block *s) 973 { 974 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 975 dout("kill_sb %p\n", s); 976 ceph_mdsc_pre_umount(fsc->mdsc); 977 kill_anon_super(s); /* will call put_super after sb is r/o */ 978 ceph_mdsc_destroy(fsc); 979 destroy_fs_client(fsc); 980 } 981 982 static struct file_system_type ceph_fs_type = { 983 .owner = THIS_MODULE, 984 .name = "ceph", 985 .mount = ceph_mount, 986 .kill_sb = ceph_kill_sb, 987 .fs_flags = FS_RENAME_DOES_D_MOVE, 988 }; 989 MODULE_ALIAS_FS("ceph"); 990 991 #define _STRINGIFY(x) #x 992 #define STRINGIFY(x) _STRINGIFY(x) 993 994 static int __init init_ceph(void) 995 { 996 int ret = init_caches(); 997 if (ret) 998 goto out; 999 1000 ceph_xattr_init(); 1001 ret = register_filesystem(&ceph_fs_type); 1002 if (ret) 1003 goto out_icache; 1004 1005 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1006 1007 return 0; 1008 1009 out_icache: 1010 ceph_xattr_exit(); 1011 destroy_caches(); 1012 out: 1013 return ret; 1014 } 1015 1016 static void __exit exit_ceph(void) 1017 { 1018 dout("exit_ceph\n"); 1019 unregister_filesystem(&ceph_fs_type); 1020 ceph_xattr_exit(); 1021 destroy_caches(); 1022 } 1023 1024 module_init(init_ceph); 1025 module_exit(exit_ceph); 1026 1027 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1028 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1029 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1030 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1031 MODULE_LICENSE("GPL"); 1032