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 #ifdef CONFIG_CEPH_FS_POSIX_ACL 149 Opt_acl, 150 #endif 151 Opt_noacl 152 }; 153 154 static match_table_t fsopt_tokens = { 155 {Opt_wsize, "wsize=%d"}, 156 {Opt_rsize, "rsize=%d"}, 157 {Opt_rasize, "rasize=%d"}, 158 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 159 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 160 {Opt_cap_release_safety, "cap_release_safety=%d"}, 161 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 162 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 163 {Opt_congestion_kb, "write_congestion_kb=%d"}, 164 /* int args above */ 165 {Opt_snapdirname, "snapdirname=%s"}, 166 /* string args above */ 167 {Opt_dirstat, "dirstat"}, 168 {Opt_nodirstat, "nodirstat"}, 169 {Opt_rbytes, "rbytes"}, 170 {Opt_norbytes, "norbytes"}, 171 {Opt_asyncreaddir, "asyncreaddir"}, 172 {Opt_noasyncreaddir, "noasyncreaddir"}, 173 {Opt_dcache, "dcache"}, 174 {Opt_nodcache, "nodcache"}, 175 {Opt_ino32, "ino32"}, 176 {Opt_noino32, "noino32"}, 177 {Opt_fscache, "fsc"}, 178 {Opt_nofscache, "nofsc"}, 179 #ifdef CONFIG_CEPH_FS_POSIX_ACL 180 {Opt_acl, "acl"}, 181 #endif 182 {Opt_noacl, "noacl"}, 183 {-1, NULL} 184 }; 185 186 static int parse_fsopt_token(char *c, void *private) 187 { 188 struct ceph_mount_options *fsopt = private; 189 substring_t argstr[MAX_OPT_ARGS]; 190 int token, intval, ret; 191 192 token = match_token((char *)c, fsopt_tokens, argstr); 193 if (token < 0) 194 return -EINVAL; 195 196 if (token < Opt_last_int) { 197 ret = match_int(&argstr[0], &intval); 198 if (ret < 0) { 199 pr_err("bad mount option arg (not int) " 200 "at '%s'\n", c); 201 return ret; 202 } 203 dout("got int token %d val %d\n", token, intval); 204 } else if (token > Opt_last_int && token < Opt_last_string) { 205 dout("got string token %d val %s\n", token, 206 argstr[0].from); 207 } else { 208 dout("got token %d\n", token); 209 } 210 211 switch (token) { 212 case Opt_snapdirname: 213 kfree(fsopt->snapdir_name); 214 fsopt->snapdir_name = kstrndup(argstr[0].from, 215 argstr[0].to-argstr[0].from, 216 GFP_KERNEL); 217 if (!fsopt->snapdir_name) 218 return -ENOMEM; 219 break; 220 221 /* misc */ 222 case Opt_wsize: 223 fsopt->wsize = intval; 224 break; 225 case Opt_rsize: 226 fsopt->rsize = intval; 227 break; 228 case Opt_rasize: 229 fsopt->rasize = intval; 230 break; 231 case Opt_caps_wanted_delay_min: 232 fsopt->caps_wanted_delay_min = intval; 233 break; 234 case Opt_caps_wanted_delay_max: 235 fsopt->caps_wanted_delay_max = intval; 236 break; 237 case Opt_readdir_max_entries: 238 fsopt->max_readdir = intval; 239 break; 240 case Opt_readdir_max_bytes: 241 fsopt->max_readdir_bytes = intval; 242 break; 243 case Opt_congestion_kb: 244 fsopt->congestion_kb = intval; 245 break; 246 case Opt_dirstat: 247 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 248 break; 249 case Opt_nodirstat: 250 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 251 break; 252 case Opt_rbytes: 253 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 254 break; 255 case Opt_norbytes: 256 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 257 break; 258 case Opt_asyncreaddir: 259 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 260 break; 261 case Opt_noasyncreaddir: 262 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 263 break; 264 case Opt_dcache: 265 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 266 break; 267 case Opt_nodcache: 268 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 269 break; 270 case Opt_ino32: 271 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 272 break; 273 case Opt_noino32: 274 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 275 break; 276 case Opt_fscache: 277 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 278 break; 279 case Opt_nofscache: 280 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 281 break; 282 #ifdef CONFIG_CEPH_FS_POSIX_ACL 283 case Opt_acl: 284 fsopt->sb_flags |= MS_POSIXACL; 285 break; 286 #endif 287 case Opt_noacl: 288 fsopt->sb_flags &= ~MS_POSIXACL; 289 break; 290 default: 291 BUG_ON(token); 292 } 293 return 0; 294 } 295 296 static void destroy_mount_options(struct ceph_mount_options *args) 297 { 298 dout("destroy_mount_options %p\n", args); 299 kfree(args->snapdir_name); 300 kfree(args); 301 } 302 303 static int strcmp_null(const char *s1, const char *s2) 304 { 305 if (!s1 && !s2) 306 return 0; 307 if (s1 && !s2) 308 return -1; 309 if (!s1 && s2) 310 return 1; 311 return strcmp(s1, s2); 312 } 313 314 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 315 struct ceph_options *new_opt, 316 struct ceph_fs_client *fsc) 317 { 318 struct ceph_mount_options *fsopt1 = new_fsopt; 319 struct ceph_mount_options *fsopt2 = fsc->mount_options; 320 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 321 int ret; 322 323 ret = memcmp(fsopt1, fsopt2, ofs); 324 if (ret) 325 return ret; 326 327 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 328 if (ret) 329 return ret; 330 331 return ceph_compare_options(new_opt, fsc->client); 332 } 333 334 static int parse_mount_options(struct ceph_mount_options **pfsopt, 335 struct ceph_options **popt, 336 int flags, char *options, 337 const char *dev_name, 338 const char **path) 339 { 340 struct ceph_mount_options *fsopt; 341 const char *dev_name_end; 342 int err; 343 344 if (!dev_name || !*dev_name) 345 return -EINVAL; 346 347 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 348 if (!fsopt) 349 return -ENOMEM; 350 351 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 352 353 fsopt->sb_flags = flags; 354 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 355 356 fsopt->rsize = CEPH_RSIZE_DEFAULT; 357 fsopt->rasize = CEPH_RASIZE_DEFAULT; 358 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 359 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 360 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 361 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 362 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 363 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 364 fsopt->congestion_kb = default_congestion_kb(); 365 366 /* 367 * Distinguish the server list from the path in "dev_name". 368 * Internally we do not include the leading '/' in the path. 369 * 370 * "dev_name" will look like: 371 * <server_spec>[,<server_spec>...]:[<path>] 372 * where 373 * <server_spec> is <ip>[:<port>] 374 * <path> is optional, but if present must begin with '/' 375 */ 376 dev_name_end = strchr(dev_name, '/'); 377 if (dev_name_end) { 378 /* skip over leading '/' for path */ 379 *path = dev_name_end + 1; 380 } else { 381 /* path is empty */ 382 dev_name_end = dev_name + strlen(dev_name); 383 *path = dev_name_end; 384 } 385 err = -EINVAL; 386 dev_name_end--; /* back up to ':' separator */ 387 if (dev_name_end < dev_name || *dev_name_end != ':') { 388 pr_err("device name is missing path (no : separator in %s)\n", 389 dev_name); 390 goto out; 391 } 392 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 393 dout("server path '%s'\n", *path); 394 395 *popt = ceph_parse_options(options, dev_name, dev_name_end, 396 parse_fsopt_token, (void *)fsopt); 397 if (IS_ERR(*popt)) { 398 err = PTR_ERR(*popt); 399 goto out; 400 } 401 402 /* success */ 403 *pfsopt = fsopt; 404 return 0; 405 406 out: 407 destroy_mount_options(fsopt); 408 return err; 409 } 410 411 /** 412 * ceph_show_options - Show mount options in /proc/mounts 413 * @m: seq_file to write to 414 * @root: root of that (sub)tree 415 */ 416 static int ceph_show_options(struct seq_file *m, struct dentry *root) 417 { 418 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 419 struct ceph_mount_options *fsopt = fsc->mount_options; 420 struct ceph_options *opt = fsc->client->options; 421 422 if (opt->flags & CEPH_OPT_FSID) 423 seq_printf(m, ",fsid=%pU", &opt->fsid); 424 if (opt->flags & CEPH_OPT_NOSHARE) 425 seq_puts(m, ",noshare"); 426 if (opt->flags & CEPH_OPT_NOCRC) 427 seq_puts(m, ",nocrc"); 428 429 if (opt->name) 430 seq_printf(m, ",name=%s", opt->name); 431 if (opt->key) 432 seq_puts(m, ",secret=<hidden>"); 433 434 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 435 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 436 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 437 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 438 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 439 seq_printf(m, ",osdkeepalivetimeout=%d", 440 opt->osd_keepalive_timeout); 441 442 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 443 seq_puts(m, ",dirstat"); 444 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 445 seq_puts(m, ",norbytes"); 446 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 447 seq_puts(m, ",noasyncreaddir"); 448 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 449 seq_puts(m, ",dcache"); 450 else 451 seq_puts(m, ",nodcache"); 452 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 453 seq_puts(m, ",fsc"); 454 else 455 seq_puts(m, ",nofsc"); 456 457 #ifdef CONFIG_CEPH_FS_POSIX_ACL 458 if (fsopt->sb_flags & MS_POSIXACL) 459 seq_puts(m, ",acl"); 460 else 461 seq_puts(m, ",noacl"); 462 #endif 463 464 if (fsopt->wsize) 465 seq_printf(m, ",wsize=%d", fsopt->wsize); 466 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 467 seq_printf(m, ",rsize=%d", fsopt->rsize); 468 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 469 seq_printf(m, ",rasize=%d", fsopt->rasize); 470 if (fsopt->congestion_kb != default_congestion_kb()) 471 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 472 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 473 seq_printf(m, ",caps_wanted_delay_min=%d", 474 fsopt->caps_wanted_delay_min); 475 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 476 seq_printf(m, ",caps_wanted_delay_max=%d", 477 fsopt->caps_wanted_delay_max); 478 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 479 seq_printf(m, ",cap_release_safety=%d", 480 fsopt->cap_release_safety); 481 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 482 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 483 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 484 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 485 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 486 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 487 return 0; 488 } 489 490 /* 491 * handle any mon messages the standard library doesn't understand. 492 * return error if we don't either. 493 */ 494 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 495 { 496 struct ceph_fs_client *fsc = client->private; 497 int type = le16_to_cpu(msg->hdr.type); 498 499 switch (type) { 500 case CEPH_MSG_MDS_MAP: 501 ceph_mdsc_handle_map(fsc->mdsc, msg); 502 return 0; 503 504 default: 505 return -1; 506 } 507 } 508 509 /* 510 * create a new fs client 511 */ 512 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 513 struct ceph_options *opt) 514 { 515 struct ceph_fs_client *fsc; 516 const u64 supported_features = 517 CEPH_FEATURE_FLOCK | 518 CEPH_FEATURE_DIRLAYOUTHASH | 519 CEPH_FEATURE_MDS_INLINE_DATA; 520 const u64 required_features = 0; 521 int page_count; 522 size_t size; 523 int err = -ENOMEM; 524 525 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 526 if (!fsc) 527 return ERR_PTR(-ENOMEM); 528 529 fsc->client = ceph_create_client(opt, fsc, supported_features, 530 required_features); 531 if (IS_ERR(fsc->client)) { 532 err = PTR_ERR(fsc->client); 533 goto fail; 534 } 535 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 536 fsc->client->monc.want_mdsmap = 1; 537 538 fsc->mount_options = fsopt; 539 540 fsc->sb = NULL; 541 fsc->mount_state = CEPH_MOUNT_MOUNTING; 542 543 atomic_long_set(&fsc->writeback_count, 0); 544 545 err = bdi_init(&fsc->backing_dev_info); 546 if (err < 0) 547 goto fail_client; 548 549 err = -ENOMEM; 550 /* 551 * The number of concurrent works can be high but they don't need 552 * to be processed in parallel, limit concurrency. 553 */ 554 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 555 if (fsc->wb_wq == NULL) 556 goto fail_bdi; 557 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 558 if (fsc->pg_inv_wq == NULL) 559 goto fail_wb_wq; 560 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 561 if (fsc->trunc_wq == NULL) 562 goto fail_pg_inv_wq; 563 564 /* set up mempools */ 565 err = -ENOMEM; 566 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 567 size = sizeof (struct page *) * (page_count ? page_count : 1); 568 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 569 if (!fsc->wb_pagevec_pool) 570 goto fail_trunc_wq; 571 572 /* setup fscache */ 573 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 574 (ceph_fscache_register_fs(fsc) != 0)) 575 goto fail_fscache; 576 577 /* caps */ 578 fsc->min_caps = fsopt->max_readdir; 579 580 return fsc; 581 582 fail_fscache: 583 ceph_fscache_unregister_fs(fsc); 584 fail_trunc_wq: 585 destroy_workqueue(fsc->trunc_wq); 586 fail_pg_inv_wq: 587 destroy_workqueue(fsc->pg_inv_wq); 588 fail_wb_wq: 589 destroy_workqueue(fsc->wb_wq); 590 fail_bdi: 591 bdi_destroy(&fsc->backing_dev_info); 592 fail_client: 593 ceph_destroy_client(fsc->client); 594 fail: 595 kfree(fsc); 596 return ERR_PTR(err); 597 } 598 599 static void destroy_fs_client(struct ceph_fs_client *fsc) 600 { 601 dout("destroy_fs_client %p\n", fsc); 602 603 ceph_fscache_unregister_fs(fsc); 604 605 destroy_workqueue(fsc->wb_wq); 606 destroy_workqueue(fsc->pg_inv_wq); 607 destroy_workqueue(fsc->trunc_wq); 608 609 bdi_destroy(&fsc->backing_dev_info); 610 611 mempool_destroy(fsc->wb_pagevec_pool); 612 613 destroy_mount_options(fsc->mount_options); 614 615 ceph_fs_debugfs_cleanup(fsc); 616 617 ceph_destroy_client(fsc->client); 618 619 kfree(fsc); 620 dout("destroy_fs_client %p done\n", fsc); 621 } 622 623 /* 624 * caches 625 */ 626 struct kmem_cache *ceph_inode_cachep; 627 struct kmem_cache *ceph_cap_cachep; 628 struct kmem_cache *ceph_dentry_cachep; 629 struct kmem_cache *ceph_file_cachep; 630 631 static void ceph_inode_init_once(void *foo) 632 { 633 struct ceph_inode_info *ci = foo; 634 inode_init_once(&ci->vfs_inode); 635 } 636 637 static int __init init_caches(void) 638 { 639 int error = -ENOMEM; 640 641 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 642 sizeof(struct ceph_inode_info), 643 __alignof__(struct ceph_inode_info), 644 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 645 ceph_inode_init_once); 646 if (ceph_inode_cachep == NULL) 647 return -ENOMEM; 648 649 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 650 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 651 if (ceph_cap_cachep == NULL) 652 goto bad_cap; 653 654 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 655 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 656 if (ceph_dentry_cachep == NULL) 657 goto bad_dentry; 658 659 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 660 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 661 if (ceph_file_cachep == NULL) 662 goto bad_file; 663 664 if ((error = ceph_fscache_register())) 665 goto bad_file; 666 667 return 0; 668 bad_file: 669 kmem_cache_destroy(ceph_dentry_cachep); 670 bad_dentry: 671 kmem_cache_destroy(ceph_cap_cachep); 672 bad_cap: 673 kmem_cache_destroy(ceph_inode_cachep); 674 return error; 675 } 676 677 static void destroy_caches(void) 678 { 679 /* 680 * Make sure all delayed rcu free inodes are flushed before we 681 * destroy cache. 682 */ 683 rcu_barrier(); 684 685 kmem_cache_destroy(ceph_inode_cachep); 686 kmem_cache_destroy(ceph_cap_cachep); 687 kmem_cache_destroy(ceph_dentry_cachep); 688 kmem_cache_destroy(ceph_file_cachep); 689 690 ceph_fscache_unregister(); 691 } 692 693 694 /* 695 * ceph_umount_begin - initiate forced umount. Tear down down the 696 * mount, skipping steps that may hang while waiting for server(s). 697 */ 698 static void ceph_umount_begin(struct super_block *sb) 699 { 700 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 701 702 dout("ceph_umount_begin - starting forced umount\n"); 703 if (!fsc) 704 return; 705 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 706 return; 707 } 708 709 static const struct super_operations ceph_super_ops = { 710 .alloc_inode = ceph_alloc_inode, 711 .destroy_inode = ceph_destroy_inode, 712 .write_inode = ceph_write_inode, 713 .drop_inode = ceph_drop_inode, 714 .sync_fs = ceph_sync_fs, 715 .put_super = ceph_put_super, 716 .show_options = ceph_show_options, 717 .statfs = ceph_statfs, 718 .umount_begin = ceph_umount_begin, 719 }; 720 721 /* 722 * Bootstrap mount by opening the root directory. Note the mount 723 * @started time from caller, and time out if this takes too long. 724 */ 725 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 726 const char *path, 727 unsigned long started) 728 { 729 struct ceph_mds_client *mdsc = fsc->mdsc; 730 struct ceph_mds_request *req = NULL; 731 int err; 732 struct dentry *root; 733 734 /* open dir */ 735 dout("open_root_inode opening '%s'\n", path); 736 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 737 if (IS_ERR(req)) 738 return ERR_CAST(req); 739 req->r_path1 = kstrdup(path, GFP_NOFS); 740 req->r_ino1.ino = CEPH_INO_ROOT; 741 req->r_ino1.snap = CEPH_NOSNAP; 742 req->r_started = started; 743 req->r_timeout = fsc->client->options->mount_timeout * HZ; 744 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 745 req->r_num_caps = 2; 746 err = ceph_mdsc_do_request(mdsc, NULL, req); 747 if (err == 0) { 748 struct inode *inode = req->r_target_inode; 749 req->r_target_inode = NULL; 750 dout("open_root_inode success\n"); 751 if (ceph_ino(inode) == CEPH_INO_ROOT && 752 fsc->sb->s_root == NULL) { 753 root = d_make_root(inode); 754 if (!root) { 755 root = ERR_PTR(-ENOMEM); 756 goto out; 757 } 758 } else { 759 root = d_obtain_root(inode); 760 } 761 ceph_init_dentry(root); 762 dout("open_root_inode success, root dentry is %p\n", root); 763 } else { 764 root = ERR_PTR(err); 765 } 766 out: 767 ceph_mdsc_put_request(req); 768 return root; 769 } 770 771 772 773 774 /* 775 * mount: join the ceph cluster, and open root directory. 776 */ 777 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 778 const char *path) 779 { 780 int err; 781 unsigned long started = jiffies; /* note the start time */ 782 struct dentry *root; 783 int first = 0; /* first vfsmount for this super_block */ 784 785 dout("mount start\n"); 786 mutex_lock(&fsc->client->mount_mutex); 787 788 err = __ceph_open_session(fsc->client, started); 789 if (err < 0) 790 goto out; 791 792 dout("mount opening root\n"); 793 root = open_root_dentry(fsc, "", started); 794 if (IS_ERR(root)) { 795 err = PTR_ERR(root); 796 goto out; 797 } 798 if (fsc->sb->s_root) { 799 dput(root); 800 } else { 801 fsc->sb->s_root = root; 802 first = 1; 803 804 err = ceph_fs_debugfs_init(fsc); 805 if (err < 0) 806 goto fail; 807 } 808 809 if (path[0] == 0) { 810 dget(root); 811 } else { 812 dout("mount opening base mountpoint\n"); 813 root = open_root_dentry(fsc, path, started); 814 if (IS_ERR(root)) { 815 err = PTR_ERR(root); 816 goto fail; 817 } 818 } 819 820 fsc->mount_state = CEPH_MOUNT_MOUNTED; 821 dout("mount success\n"); 822 mutex_unlock(&fsc->client->mount_mutex); 823 return root; 824 825 out: 826 mutex_unlock(&fsc->client->mount_mutex); 827 return ERR_PTR(err); 828 829 fail: 830 if (first) { 831 dput(fsc->sb->s_root); 832 fsc->sb->s_root = NULL; 833 } 834 goto out; 835 } 836 837 static int ceph_set_super(struct super_block *s, void *data) 838 { 839 struct ceph_fs_client *fsc = data; 840 int ret; 841 842 dout("set_super %p data %p\n", s, data); 843 844 s->s_flags = fsc->mount_options->sb_flags; 845 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 846 847 s->s_xattr = ceph_xattr_handlers; 848 s->s_fs_info = fsc; 849 fsc->sb = s; 850 851 s->s_op = &ceph_super_ops; 852 s->s_export_op = &ceph_export_ops; 853 854 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 855 856 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 857 if (ret != 0) 858 goto fail; 859 860 return ret; 861 862 fail: 863 s->s_fs_info = NULL; 864 fsc->sb = NULL; 865 return ret; 866 } 867 868 /* 869 * share superblock if same fs AND options 870 */ 871 static int ceph_compare_super(struct super_block *sb, void *data) 872 { 873 struct ceph_fs_client *new = data; 874 struct ceph_mount_options *fsopt = new->mount_options; 875 struct ceph_options *opt = new->client->options; 876 struct ceph_fs_client *other = ceph_sb_to_client(sb); 877 878 dout("ceph_compare_super %p\n", sb); 879 880 if (compare_mount_options(fsopt, opt, other)) { 881 dout("monitor(s)/mount options don't match\n"); 882 return 0; 883 } 884 if ((opt->flags & CEPH_OPT_FSID) && 885 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 886 dout("fsid doesn't match\n"); 887 return 0; 888 } 889 if (fsopt->sb_flags != other->mount_options->sb_flags) { 890 dout("flags differ\n"); 891 return 0; 892 } 893 return 1; 894 } 895 896 /* 897 * construct our own bdi so we can control readahead, etc. 898 */ 899 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 900 901 static int ceph_register_bdi(struct super_block *sb, 902 struct ceph_fs_client *fsc) 903 { 904 int err; 905 906 /* set ra_pages based on rasize mount option? */ 907 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 908 fsc->backing_dev_info.ra_pages = 909 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 910 >> PAGE_SHIFT; 911 else 912 fsc->backing_dev_info.ra_pages = 913 default_backing_dev_info.ra_pages; 914 915 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 916 atomic_long_inc_return(&bdi_seq)); 917 if (!err) 918 sb->s_bdi = &fsc->backing_dev_info; 919 return err; 920 } 921 922 static struct dentry *ceph_mount(struct file_system_type *fs_type, 923 int flags, const char *dev_name, void *data) 924 { 925 struct super_block *sb; 926 struct ceph_fs_client *fsc; 927 struct dentry *res; 928 int err; 929 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 930 const char *path = NULL; 931 struct ceph_mount_options *fsopt = NULL; 932 struct ceph_options *opt = NULL; 933 934 dout("ceph_mount\n"); 935 936 #ifdef CONFIG_CEPH_FS_POSIX_ACL 937 flags |= MS_POSIXACL; 938 #endif 939 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 940 if (err < 0) { 941 res = ERR_PTR(err); 942 goto out_final; 943 } 944 945 /* create client (which we may/may not use) */ 946 fsc = create_fs_client(fsopt, opt); 947 if (IS_ERR(fsc)) { 948 res = ERR_CAST(fsc); 949 destroy_mount_options(fsopt); 950 ceph_destroy_options(opt); 951 goto out_final; 952 } 953 954 err = ceph_mdsc_init(fsc); 955 if (err < 0) { 956 res = ERR_PTR(err); 957 goto out; 958 } 959 960 if (ceph_test_opt(fsc->client, NOSHARE)) 961 compare_super = NULL; 962 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 963 if (IS_ERR(sb)) { 964 res = ERR_CAST(sb); 965 goto out; 966 } 967 968 if (ceph_sb_to_client(sb) != fsc) { 969 ceph_mdsc_destroy(fsc); 970 destroy_fs_client(fsc); 971 fsc = ceph_sb_to_client(sb); 972 dout("get_sb got existing client %p\n", fsc); 973 } else { 974 dout("get_sb using new client %p\n", fsc); 975 err = ceph_register_bdi(sb, fsc); 976 if (err < 0) { 977 res = ERR_PTR(err); 978 goto out_splat; 979 } 980 } 981 982 res = ceph_real_mount(fsc, path); 983 if (IS_ERR(res)) 984 goto out_splat; 985 dout("root %p inode %p ino %llx.%llx\n", res, 986 res->d_inode, ceph_vinop(res->d_inode)); 987 return res; 988 989 out_splat: 990 ceph_mdsc_close_sessions(fsc->mdsc); 991 deactivate_locked_super(sb); 992 goto out_final; 993 994 out: 995 ceph_mdsc_destroy(fsc); 996 destroy_fs_client(fsc); 997 out_final: 998 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 999 return res; 1000 } 1001 1002 static void ceph_kill_sb(struct super_block *s) 1003 { 1004 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1005 dout("kill_sb %p\n", s); 1006 ceph_mdsc_pre_umount(fsc->mdsc); 1007 kill_anon_super(s); /* will call put_super after sb is r/o */ 1008 ceph_mdsc_destroy(fsc); 1009 destroy_fs_client(fsc); 1010 } 1011 1012 static struct file_system_type ceph_fs_type = { 1013 .owner = THIS_MODULE, 1014 .name = "ceph", 1015 .mount = ceph_mount, 1016 .kill_sb = ceph_kill_sb, 1017 .fs_flags = FS_RENAME_DOES_D_MOVE, 1018 }; 1019 MODULE_ALIAS_FS("ceph"); 1020 1021 static int __init init_ceph(void) 1022 { 1023 int ret = init_caches(); 1024 if (ret) 1025 goto out; 1026 1027 ceph_flock_init(); 1028 ceph_xattr_init(); 1029 ret = ceph_snap_init(); 1030 if (ret) 1031 goto out_xattr; 1032 ret = register_filesystem(&ceph_fs_type); 1033 if (ret) 1034 goto out_snap; 1035 1036 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1037 1038 return 0; 1039 1040 out_snap: 1041 ceph_snap_exit(); 1042 out_xattr: 1043 ceph_xattr_exit(); 1044 destroy_caches(); 1045 out: 1046 return ret; 1047 } 1048 1049 static void __exit exit_ceph(void) 1050 { 1051 dout("exit_ceph\n"); 1052 unregister_filesystem(&ceph_fs_type); 1053 ceph_snap_exit(); 1054 ceph_xattr_exit(); 1055 destroy_caches(); 1056 } 1057 1058 module_init(init_ceph); 1059 module_exit(exit_ceph); 1060 1061 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1062 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1063 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1064 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1065 MODULE_LICENSE("GPL"); 1066