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 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 46 { 47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); 48 struct ceph_monmap *monmap = fsc->client->monc.monmap; 49 struct ceph_statfs st; 50 u64 fsid; 51 int err; 52 53 dout("statfs\n"); 54 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 55 if (err < 0) 56 return err; 57 58 /* fill in kstatfs */ 59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 60 61 /* 62 * express utilization in terms of large blocks to avoid 63 * overflow on 32-bit machines. 64 * 65 * NOTE: for the time being, we make bsize == frsize to humor 66 * not-yet-ancient versions of glibc that are broken. 67 * Someday, we will probably want to report a real block 68 * size... whatever that may mean for a network file system! 69 */ 70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 75 76 buf->f_files = le64_to_cpu(st.num_objects); 77 buf->f_ffree = -1; 78 buf->f_namelen = NAME_MAX; 79 80 /* leave fsid little-endian, regardless of host endianness */ 81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 82 buf->f_fsid.val[0] = fsid & 0xffffffff; 83 buf->f_fsid.val[1] = fsid >> 32; 84 85 return 0; 86 } 87 88 89 static int ceph_sync_fs(struct super_block *sb, int wait) 90 { 91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 92 93 if (!wait) { 94 dout("sync_fs (non-blocking)\n"); 95 ceph_flush_dirty_caps(fsc->mdsc); 96 dout("sync_fs (non-blocking) done\n"); 97 return 0; 98 } 99 100 dout("sync_fs (blocking)\n"); 101 ceph_osdc_sync(&fsc->client->osdc); 102 ceph_mdsc_sync(fsc->mdsc); 103 dout("sync_fs (blocking) done\n"); 104 return 0; 105 } 106 107 /* 108 * mount options 109 */ 110 enum { 111 Opt_wsize, 112 Opt_rsize, 113 Opt_rasize, 114 Opt_caps_wanted_delay_min, 115 Opt_caps_wanted_delay_max, 116 Opt_cap_release_safety, 117 Opt_readdir_max_entries, 118 Opt_readdir_max_bytes, 119 Opt_congestion_kb, 120 Opt_last_int, 121 /* int args above */ 122 Opt_snapdirname, 123 Opt_last_string, 124 /* string args above */ 125 Opt_dirstat, 126 Opt_nodirstat, 127 Opt_rbytes, 128 Opt_norbytes, 129 Opt_asyncreaddir, 130 Opt_noasyncreaddir, 131 Opt_dcache, 132 Opt_nodcache, 133 Opt_ino32, 134 Opt_noino32, 135 Opt_fscache, 136 Opt_nofscache, 137 #ifdef CONFIG_CEPH_FS_POSIX_ACL 138 Opt_acl, 139 #endif 140 Opt_noacl 141 }; 142 143 static match_table_t fsopt_tokens = { 144 {Opt_wsize, "wsize=%d"}, 145 {Opt_rsize, "rsize=%d"}, 146 {Opt_rasize, "rasize=%d"}, 147 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 148 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 149 {Opt_cap_release_safety, "cap_release_safety=%d"}, 150 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 151 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 152 {Opt_congestion_kb, "write_congestion_kb=%d"}, 153 /* int args above */ 154 {Opt_snapdirname, "snapdirname=%s"}, 155 /* string args above */ 156 {Opt_dirstat, "dirstat"}, 157 {Opt_nodirstat, "nodirstat"}, 158 {Opt_rbytes, "rbytes"}, 159 {Opt_norbytes, "norbytes"}, 160 {Opt_asyncreaddir, "asyncreaddir"}, 161 {Opt_noasyncreaddir, "noasyncreaddir"}, 162 {Opt_dcache, "dcache"}, 163 {Opt_nodcache, "nodcache"}, 164 {Opt_ino32, "ino32"}, 165 {Opt_noino32, "noino32"}, 166 {Opt_fscache, "fsc"}, 167 {Opt_nofscache, "nofsc"}, 168 #ifdef CONFIG_CEPH_FS_POSIX_ACL 169 {Opt_acl, "acl"}, 170 #endif 171 {Opt_noacl, "noacl"}, 172 {-1, NULL} 173 }; 174 175 static int parse_fsopt_token(char *c, void *private) 176 { 177 struct ceph_mount_options *fsopt = private; 178 substring_t argstr[MAX_OPT_ARGS]; 179 int token, intval, ret; 180 181 token = match_token((char *)c, fsopt_tokens, argstr); 182 if (token < 0) 183 return -EINVAL; 184 185 if (token < Opt_last_int) { 186 ret = match_int(&argstr[0], &intval); 187 if (ret < 0) { 188 pr_err("bad mount option arg (not int) " 189 "at '%s'\n", c); 190 return ret; 191 } 192 dout("got int token %d val %d\n", token, intval); 193 } else if (token > Opt_last_int && token < Opt_last_string) { 194 dout("got string token %d val %s\n", token, 195 argstr[0].from); 196 } else { 197 dout("got token %d\n", token); 198 } 199 200 switch (token) { 201 case Opt_snapdirname: 202 kfree(fsopt->snapdir_name); 203 fsopt->snapdir_name = kstrndup(argstr[0].from, 204 argstr[0].to-argstr[0].from, 205 GFP_KERNEL); 206 if (!fsopt->snapdir_name) 207 return -ENOMEM; 208 break; 209 210 /* misc */ 211 case Opt_wsize: 212 fsopt->wsize = intval; 213 break; 214 case Opt_rsize: 215 fsopt->rsize = intval; 216 break; 217 case Opt_rasize: 218 fsopt->rasize = intval; 219 break; 220 case Opt_caps_wanted_delay_min: 221 fsopt->caps_wanted_delay_min = intval; 222 break; 223 case Opt_caps_wanted_delay_max: 224 fsopt->caps_wanted_delay_max = intval; 225 break; 226 case Opt_readdir_max_entries: 227 fsopt->max_readdir = intval; 228 break; 229 case Opt_readdir_max_bytes: 230 fsopt->max_readdir_bytes = intval; 231 break; 232 case Opt_congestion_kb: 233 fsopt->congestion_kb = intval; 234 break; 235 case Opt_dirstat: 236 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 237 break; 238 case Opt_nodirstat: 239 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 240 break; 241 case Opt_rbytes: 242 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 243 break; 244 case Opt_norbytes: 245 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 246 break; 247 case Opt_asyncreaddir: 248 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 249 break; 250 case Opt_noasyncreaddir: 251 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 252 break; 253 case Opt_dcache: 254 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 255 break; 256 case Opt_nodcache: 257 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 258 break; 259 case Opt_ino32: 260 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 261 break; 262 case Opt_noino32: 263 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 264 break; 265 case Opt_fscache: 266 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 267 break; 268 case Opt_nofscache: 269 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 270 break; 271 #ifdef CONFIG_CEPH_FS_POSIX_ACL 272 case Opt_acl: 273 fsopt->sb_flags |= MS_POSIXACL; 274 break; 275 #endif 276 case Opt_noacl: 277 fsopt->sb_flags &= ~MS_POSIXACL; 278 break; 279 default: 280 BUG_ON(token); 281 } 282 return 0; 283 } 284 285 static void destroy_mount_options(struct ceph_mount_options *args) 286 { 287 dout("destroy_mount_options %p\n", args); 288 kfree(args->snapdir_name); 289 kfree(args); 290 } 291 292 static int strcmp_null(const char *s1, const char *s2) 293 { 294 if (!s1 && !s2) 295 return 0; 296 if (s1 && !s2) 297 return -1; 298 if (!s1 && s2) 299 return 1; 300 return strcmp(s1, s2); 301 } 302 303 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 304 struct ceph_options *new_opt, 305 struct ceph_fs_client *fsc) 306 { 307 struct ceph_mount_options *fsopt1 = new_fsopt; 308 struct ceph_mount_options *fsopt2 = fsc->mount_options; 309 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 310 int ret; 311 312 ret = memcmp(fsopt1, fsopt2, ofs); 313 if (ret) 314 return ret; 315 316 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 317 if (ret) 318 return ret; 319 320 return ceph_compare_options(new_opt, fsc->client); 321 } 322 323 static int parse_mount_options(struct ceph_mount_options **pfsopt, 324 struct ceph_options **popt, 325 int flags, char *options, 326 const char *dev_name, 327 const char **path) 328 { 329 struct ceph_mount_options *fsopt; 330 const char *dev_name_end; 331 int err; 332 333 if (!dev_name || !*dev_name) 334 return -EINVAL; 335 336 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 337 if (!fsopt) 338 return -ENOMEM; 339 340 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 341 342 fsopt->sb_flags = flags; 343 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 344 345 fsopt->rsize = CEPH_RSIZE_DEFAULT; 346 fsopt->rasize = CEPH_RASIZE_DEFAULT; 347 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 348 if (!fsopt->snapdir_name) { 349 err = -ENOMEM; 350 goto out; 351 } 352 353 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 354 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 355 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 356 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 357 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 358 fsopt->congestion_kb = default_congestion_kb(); 359 360 /* 361 * Distinguish the server list from the path in "dev_name". 362 * Internally we do not include the leading '/' in the path. 363 * 364 * "dev_name" will look like: 365 * <server_spec>[,<server_spec>...]:[<path>] 366 * where 367 * <server_spec> is <ip>[:<port>] 368 * <path> is optional, but if present must begin with '/' 369 */ 370 dev_name_end = strchr(dev_name, '/'); 371 if (dev_name_end) { 372 /* skip over leading '/' for path */ 373 *path = dev_name_end + 1; 374 } else { 375 /* path is empty */ 376 dev_name_end = dev_name + strlen(dev_name); 377 *path = dev_name_end; 378 } 379 err = -EINVAL; 380 dev_name_end--; /* back up to ':' separator */ 381 if (dev_name_end < dev_name || *dev_name_end != ':') { 382 pr_err("device name is missing path (no : separator in %s)\n", 383 dev_name); 384 goto out; 385 } 386 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 387 dout("server path '%s'\n", *path); 388 389 *popt = ceph_parse_options(options, dev_name, dev_name_end, 390 parse_fsopt_token, (void *)fsopt); 391 if (IS_ERR(*popt)) { 392 err = PTR_ERR(*popt); 393 goto out; 394 } 395 396 /* success */ 397 *pfsopt = fsopt; 398 return 0; 399 400 out: 401 destroy_mount_options(fsopt); 402 return err; 403 } 404 405 /** 406 * ceph_show_options - Show mount options in /proc/mounts 407 * @m: seq_file to write to 408 * @root: root of that (sub)tree 409 */ 410 static int ceph_show_options(struct seq_file *m, struct dentry *root) 411 { 412 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 413 struct ceph_mount_options *fsopt = fsc->mount_options; 414 size_t pos; 415 int ret; 416 417 /* a comma between MNT/MS and client options */ 418 seq_putc(m, ','); 419 pos = m->count; 420 421 ret = ceph_print_client_options(m, fsc->client); 422 if (ret) 423 return ret; 424 425 /* retract our comma if no client options */ 426 if (m->count == pos) 427 m->count--; 428 429 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 430 seq_puts(m, ",dirstat"); 431 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 432 seq_puts(m, ",norbytes"); 433 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 434 seq_puts(m, ",noasyncreaddir"); 435 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 436 seq_puts(m, ",nodcache"); 437 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 438 seq_puts(m, ",fsc"); 439 440 #ifdef CONFIG_CEPH_FS_POSIX_ACL 441 if (fsopt->sb_flags & MS_POSIXACL) 442 seq_puts(m, ",acl"); 443 else 444 seq_puts(m, ",noacl"); 445 #endif 446 447 if (fsopt->wsize) 448 seq_printf(m, ",wsize=%d", fsopt->wsize); 449 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 450 seq_printf(m, ",rsize=%d", fsopt->rsize); 451 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 452 seq_printf(m, ",rasize=%d", fsopt->rasize); 453 if (fsopt->congestion_kb != default_congestion_kb()) 454 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 455 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 456 seq_printf(m, ",caps_wanted_delay_min=%d", 457 fsopt->caps_wanted_delay_min); 458 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 459 seq_printf(m, ",caps_wanted_delay_max=%d", 460 fsopt->caps_wanted_delay_max); 461 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 462 seq_printf(m, ",cap_release_safety=%d", 463 fsopt->cap_release_safety); 464 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 465 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 466 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 467 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 468 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 469 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 470 471 return 0; 472 } 473 474 /* 475 * handle any mon messages the standard library doesn't understand. 476 * return error if we don't either. 477 */ 478 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 479 { 480 struct ceph_fs_client *fsc = client->private; 481 int type = le16_to_cpu(msg->hdr.type); 482 483 switch (type) { 484 case CEPH_MSG_MDS_MAP: 485 ceph_mdsc_handle_map(fsc->mdsc, msg); 486 return 0; 487 488 default: 489 return -1; 490 } 491 } 492 493 /* 494 * create a new fs client 495 */ 496 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 497 struct ceph_options *opt) 498 { 499 struct ceph_fs_client *fsc; 500 const u64 supported_features = 501 CEPH_FEATURE_FLOCK | 502 CEPH_FEATURE_DIRLAYOUTHASH | 503 CEPH_FEATURE_MDS_INLINE_DATA; 504 const u64 required_features = 0; 505 int page_count; 506 size_t size; 507 int err = -ENOMEM; 508 509 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 510 if (!fsc) 511 return ERR_PTR(-ENOMEM); 512 513 fsc->client = ceph_create_client(opt, fsc, supported_features, 514 required_features); 515 if (IS_ERR(fsc->client)) { 516 err = PTR_ERR(fsc->client); 517 goto fail; 518 } 519 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 520 fsc->client->monc.want_mdsmap = 1; 521 522 fsc->mount_options = fsopt; 523 524 fsc->sb = NULL; 525 fsc->mount_state = CEPH_MOUNT_MOUNTING; 526 527 atomic_long_set(&fsc->writeback_count, 0); 528 529 err = bdi_init(&fsc->backing_dev_info); 530 if (err < 0) 531 goto fail_client; 532 533 err = -ENOMEM; 534 /* 535 * The number of concurrent works can be high but they don't need 536 * to be processed in parallel, limit concurrency. 537 */ 538 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 539 if (fsc->wb_wq == NULL) 540 goto fail_bdi; 541 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 542 if (fsc->pg_inv_wq == NULL) 543 goto fail_wb_wq; 544 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 545 if (fsc->trunc_wq == NULL) 546 goto fail_pg_inv_wq; 547 548 /* set up mempools */ 549 err = -ENOMEM; 550 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 551 size = sizeof (struct page *) * (page_count ? page_count : 1); 552 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 553 if (!fsc->wb_pagevec_pool) 554 goto fail_trunc_wq; 555 556 /* setup fscache */ 557 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 558 (ceph_fscache_register_fs(fsc) != 0)) 559 goto fail_fscache; 560 561 /* caps */ 562 fsc->min_caps = fsopt->max_readdir; 563 564 return fsc; 565 566 fail_fscache: 567 ceph_fscache_unregister_fs(fsc); 568 fail_trunc_wq: 569 destroy_workqueue(fsc->trunc_wq); 570 fail_pg_inv_wq: 571 destroy_workqueue(fsc->pg_inv_wq); 572 fail_wb_wq: 573 destroy_workqueue(fsc->wb_wq); 574 fail_bdi: 575 bdi_destroy(&fsc->backing_dev_info); 576 fail_client: 577 ceph_destroy_client(fsc->client); 578 fail: 579 kfree(fsc); 580 return ERR_PTR(err); 581 } 582 583 static void destroy_fs_client(struct ceph_fs_client *fsc) 584 { 585 dout("destroy_fs_client %p\n", fsc); 586 587 ceph_fscache_unregister_fs(fsc); 588 589 destroy_workqueue(fsc->wb_wq); 590 destroy_workqueue(fsc->pg_inv_wq); 591 destroy_workqueue(fsc->trunc_wq); 592 593 bdi_destroy(&fsc->backing_dev_info); 594 595 mempool_destroy(fsc->wb_pagevec_pool); 596 597 destroy_mount_options(fsc->mount_options); 598 599 ceph_fs_debugfs_cleanup(fsc); 600 601 ceph_destroy_client(fsc->client); 602 603 kfree(fsc); 604 dout("destroy_fs_client %p done\n", fsc); 605 } 606 607 /* 608 * caches 609 */ 610 struct kmem_cache *ceph_inode_cachep; 611 struct kmem_cache *ceph_cap_cachep; 612 struct kmem_cache *ceph_dentry_cachep; 613 struct kmem_cache *ceph_file_cachep; 614 615 static void ceph_inode_init_once(void *foo) 616 { 617 struct ceph_inode_info *ci = foo; 618 inode_init_once(&ci->vfs_inode); 619 } 620 621 static int __init init_caches(void) 622 { 623 int error = -ENOMEM; 624 625 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 626 sizeof(struct ceph_inode_info), 627 __alignof__(struct ceph_inode_info), 628 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 629 ceph_inode_init_once); 630 if (ceph_inode_cachep == NULL) 631 return -ENOMEM; 632 633 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 634 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 635 if (ceph_cap_cachep == NULL) 636 goto bad_cap; 637 638 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 639 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 640 if (ceph_dentry_cachep == NULL) 641 goto bad_dentry; 642 643 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 644 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 645 if (ceph_file_cachep == NULL) 646 goto bad_file; 647 648 if ((error = ceph_fscache_register())) 649 goto bad_file; 650 651 return 0; 652 bad_file: 653 kmem_cache_destroy(ceph_dentry_cachep); 654 bad_dentry: 655 kmem_cache_destroy(ceph_cap_cachep); 656 bad_cap: 657 kmem_cache_destroy(ceph_inode_cachep); 658 return error; 659 } 660 661 static void destroy_caches(void) 662 { 663 /* 664 * Make sure all delayed rcu free inodes are flushed before we 665 * destroy cache. 666 */ 667 rcu_barrier(); 668 669 kmem_cache_destroy(ceph_inode_cachep); 670 kmem_cache_destroy(ceph_cap_cachep); 671 kmem_cache_destroy(ceph_dentry_cachep); 672 kmem_cache_destroy(ceph_file_cachep); 673 674 ceph_fscache_unregister(); 675 } 676 677 678 /* 679 * ceph_umount_begin - initiate forced umount. Tear down down the 680 * mount, skipping steps that may hang while waiting for server(s). 681 */ 682 static void ceph_umount_begin(struct super_block *sb) 683 { 684 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 685 686 dout("ceph_umount_begin - starting forced umount\n"); 687 if (!fsc) 688 return; 689 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 690 return; 691 } 692 693 static const struct super_operations ceph_super_ops = { 694 .alloc_inode = ceph_alloc_inode, 695 .destroy_inode = ceph_destroy_inode, 696 .write_inode = ceph_write_inode, 697 .drop_inode = ceph_drop_inode, 698 .sync_fs = ceph_sync_fs, 699 .put_super = ceph_put_super, 700 .show_options = ceph_show_options, 701 .statfs = ceph_statfs, 702 .umount_begin = ceph_umount_begin, 703 }; 704 705 /* 706 * Bootstrap mount by opening the root directory. Note the mount 707 * @started time from caller, and time out if this takes too long. 708 */ 709 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 710 const char *path, 711 unsigned long started) 712 { 713 struct ceph_mds_client *mdsc = fsc->mdsc; 714 struct ceph_mds_request *req = NULL; 715 int err; 716 struct dentry *root; 717 718 /* open dir */ 719 dout("open_root_inode opening '%s'\n", path); 720 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 721 if (IS_ERR(req)) 722 return ERR_CAST(req); 723 req->r_path1 = kstrdup(path, GFP_NOFS); 724 if (!req->r_path1) { 725 root = ERR_PTR(-ENOMEM); 726 goto out; 727 } 728 729 req->r_ino1.ino = CEPH_INO_ROOT; 730 req->r_ino1.snap = CEPH_NOSNAP; 731 req->r_started = started; 732 req->r_timeout = fsc->client->options->mount_timeout * HZ; 733 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 734 req->r_num_caps = 2; 735 err = ceph_mdsc_do_request(mdsc, NULL, req); 736 if (err == 0) { 737 struct inode *inode = req->r_target_inode; 738 req->r_target_inode = NULL; 739 dout("open_root_inode success\n"); 740 if (ceph_ino(inode) == CEPH_INO_ROOT && 741 fsc->sb->s_root == NULL) { 742 root = d_make_root(inode); 743 if (!root) { 744 root = ERR_PTR(-ENOMEM); 745 goto out; 746 } 747 } else { 748 root = d_obtain_root(inode); 749 } 750 ceph_init_dentry(root); 751 dout("open_root_inode success, root dentry is %p\n", root); 752 } else { 753 root = ERR_PTR(err); 754 } 755 out: 756 ceph_mdsc_put_request(req); 757 return root; 758 } 759 760 761 762 763 /* 764 * mount: join the ceph cluster, and open root directory. 765 */ 766 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 767 const char *path) 768 { 769 int err; 770 unsigned long started = jiffies; /* note the start time */ 771 struct dentry *root; 772 int first = 0; /* first vfsmount for this super_block */ 773 774 dout("mount start\n"); 775 mutex_lock(&fsc->client->mount_mutex); 776 777 err = __ceph_open_session(fsc->client, started); 778 if (err < 0) 779 goto out; 780 781 dout("mount opening root\n"); 782 root = open_root_dentry(fsc, "", started); 783 if (IS_ERR(root)) { 784 err = PTR_ERR(root); 785 goto out; 786 } 787 if (fsc->sb->s_root) { 788 dput(root); 789 } else { 790 fsc->sb->s_root = root; 791 first = 1; 792 793 err = ceph_fs_debugfs_init(fsc); 794 if (err < 0) 795 goto fail; 796 } 797 798 if (path[0] == 0) { 799 dget(root); 800 } else { 801 dout("mount opening base mountpoint\n"); 802 root = open_root_dentry(fsc, path, started); 803 if (IS_ERR(root)) { 804 err = PTR_ERR(root); 805 goto fail; 806 } 807 } 808 809 fsc->mount_state = CEPH_MOUNT_MOUNTED; 810 dout("mount success\n"); 811 mutex_unlock(&fsc->client->mount_mutex); 812 return root; 813 814 out: 815 mutex_unlock(&fsc->client->mount_mutex); 816 return ERR_PTR(err); 817 818 fail: 819 if (first) { 820 dput(fsc->sb->s_root); 821 fsc->sb->s_root = NULL; 822 } 823 goto out; 824 } 825 826 static int ceph_set_super(struct super_block *s, void *data) 827 { 828 struct ceph_fs_client *fsc = data; 829 int ret; 830 831 dout("set_super %p data %p\n", s, data); 832 833 s->s_flags = fsc->mount_options->sb_flags; 834 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 835 836 s->s_xattr = ceph_xattr_handlers; 837 s->s_fs_info = fsc; 838 fsc->sb = s; 839 840 s->s_op = &ceph_super_ops; 841 s->s_export_op = &ceph_export_ops; 842 843 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 844 845 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 846 if (ret != 0) 847 goto fail; 848 849 return ret; 850 851 fail: 852 s->s_fs_info = NULL; 853 fsc->sb = NULL; 854 return ret; 855 } 856 857 /* 858 * share superblock if same fs AND options 859 */ 860 static int ceph_compare_super(struct super_block *sb, void *data) 861 { 862 struct ceph_fs_client *new = data; 863 struct ceph_mount_options *fsopt = new->mount_options; 864 struct ceph_options *opt = new->client->options; 865 struct ceph_fs_client *other = ceph_sb_to_client(sb); 866 867 dout("ceph_compare_super %p\n", sb); 868 869 if (compare_mount_options(fsopt, opt, other)) { 870 dout("monitor(s)/mount options don't match\n"); 871 return 0; 872 } 873 if ((opt->flags & CEPH_OPT_FSID) && 874 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 875 dout("fsid doesn't match\n"); 876 return 0; 877 } 878 if (fsopt->sb_flags != other->mount_options->sb_flags) { 879 dout("flags differ\n"); 880 return 0; 881 } 882 return 1; 883 } 884 885 /* 886 * construct our own bdi so we can control readahead, etc. 887 */ 888 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 889 890 static int ceph_register_bdi(struct super_block *sb, 891 struct ceph_fs_client *fsc) 892 { 893 int err; 894 895 /* set ra_pages based on rasize mount option? */ 896 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 897 fsc->backing_dev_info.ra_pages = 898 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 899 >> PAGE_SHIFT; 900 else 901 fsc->backing_dev_info.ra_pages = 902 VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; 903 904 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 905 atomic_long_inc_return(&bdi_seq)); 906 if (!err) 907 sb->s_bdi = &fsc->backing_dev_info; 908 return err; 909 } 910 911 static struct dentry *ceph_mount(struct file_system_type *fs_type, 912 int flags, const char *dev_name, void *data) 913 { 914 struct super_block *sb; 915 struct ceph_fs_client *fsc; 916 struct dentry *res; 917 int err; 918 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 919 const char *path = NULL; 920 struct ceph_mount_options *fsopt = NULL; 921 struct ceph_options *opt = NULL; 922 923 dout("ceph_mount\n"); 924 925 #ifdef CONFIG_CEPH_FS_POSIX_ACL 926 flags |= MS_POSIXACL; 927 #endif 928 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 929 if (err < 0) { 930 res = ERR_PTR(err); 931 goto out_final; 932 } 933 934 /* create client (which we may/may not use) */ 935 fsc = create_fs_client(fsopt, opt); 936 if (IS_ERR(fsc)) { 937 res = ERR_CAST(fsc); 938 destroy_mount_options(fsopt); 939 ceph_destroy_options(opt); 940 goto out_final; 941 } 942 943 err = ceph_mdsc_init(fsc); 944 if (err < 0) { 945 res = ERR_PTR(err); 946 goto out; 947 } 948 949 if (ceph_test_opt(fsc->client, NOSHARE)) 950 compare_super = NULL; 951 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 952 if (IS_ERR(sb)) { 953 res = ERR_CAST(sb); 954 goto out; 955 } 956 957 if (ceph_sb_to_client(sb) != fsc) { 958 ceph_mdsc_destroy(fsc); 959 destroy_fs_client(fsc); 960 fsc = ceph_sb_to_client(sb); 961 dout("get_sb got existing client %p\n", fsc); 962 } else { 963 dout("get_sb using new client %p\n", fsc); 964 err = ceph_register_bdi(sb, fsc); 965 if (err < 0) { 966 res = ERR_PTR(err); 967 goto out_splat; 968 } 969 } 970 971 res = ceph_real_mount(fsc, path); 972 if (IS_ERR(res)) 973 goto out_splat; 974 dout("root %p inode %p ino %llx.%llx\n", res, 975 d_inode(res), ceph_vinop(d_inode(res))); 976 return res; 977 978 out_splat: 979 ceph_mdsc_close_sessions(fsc->mdsc); 980 deactivate_locked_super(sb); 981 goto out_final; 982 983 out: 984 ceph_mdsc_destroy(fsc); 985 destroy_fs_client(fsc); 986 out_final: 987 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 988 return res; 989 } 990 991 static void ceph_kill_sb(struct super_block *s) 992 { 993 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 994 dev_t dev = s->s_dev; 995 996 dout("kill_sb %p\n", s); 997 998 ceph_mdsc_pre_umount(fsc->mdsc); 999 generic_shutdown_super(s); 1000 ceph_mdsc_destroy(fsc); 1001 1002 destroy_fs_client(fsc); 1003 free_anon_bdev(dev); 1004 } 1005 1006 static struct file_system_type ceph_fs_type = { 1007 .owner = THIS_MODULE, 1008 .name = "ceph", 1009 .mount = ceph_mount, 1010 .kill_sb = ceph_kill_sb, 1011 .fs_flags = FS_RENAME_DOES_D_MOVE, 1012 }; 1013 MODULE_ALIAS_FS("ceph"); 1014 1015 static int __init init_ceph(void) 1016 { 1017 int ret = init_caches(); 1018 if (ret) 1019 goto out; 1020 1021 ceph_flock_init(); 1022 ceph_xattr_init(); 1023 ret = ceph_snap_init(); 1024 if (ret) 1025 goto out_xattr; 1026 ret = register_filesystem(&ceph_fs_type); 1027 if (ret) 1028 goto out_snap; 1029 1030 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1031 1032 return 0; 1033 1034 out_snap: 1035 ceph_snap_exit(); 1036 out_xattr: 1037 ceph_xattr_exit(); 1038 destroy_caches(); 1039 out: 1040 return ret; 1041 } 1042 1043 static void __exit exit_ceph(void) 1044 { 1045 dout("exit_ceph\n"); 1046 unregister_filesystem(&ceph_fs_type); 1047 ceph_snap_exit(); 1048 ceph_xattr_exit(); 1049 destroy_caches(); 1050 } 1051 1052 module_init(init_ceph); 1053 module_exit(exit_ceph); 1054 1055 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1056 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1057 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1058 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1059 MODULE_LICENSE("GPL"); 1060