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 const u64 required_features = 0; 520 int page_count; 521 size_t size; 522 int err = -ENOMEM; 523 524 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 525 if (!fsc) 526 return ERR_PTR(-ENOMEM); 527 528 fsc->client = ceph_create_client(opt, fsc, supported_features, 529 required_features); 530 if (IS_ERR(fsc->client)) { 531 err = PTR_ERR(fsc->client); 532 goto fail; 533 } 534 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 535 fsc->client->monc.want_mdsmap = 1; 536 537 fsc->mount_options = fsopt; 538 539 fsc->sb = NULL; 540 fsc->mount_state = CEPH_MOUNT_MOUNTING; 541 542 atomic_long_set(&fsc->writeback_count, 0); 543 544 err = bdi_init(&fsc->backing_dev_info); 545 if (err < 0) 546 goto fail_client; 547 548 err = -ENOMEM; 549 /* 550 * The number of concurrent works can be high but they don't need 551 * to be processed in parallel, limit concurrency. 552 */ 553 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 554 if (fsc->wb_wq == NULL) 555 goto fail_bdi; 556 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 557 if (fsc->pg_inv_wq == NULL) 558 goto fail_wb_wq; 559 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 560 if (fsc->trunc_wq == NULL) 561 goto fail_pg_inv_wq; 562 563 /* set up mempools */ 564 err = -ENOMEM; 565 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 566 size = sizeof (struct page *) * (page_count ? page_count : 1); 567 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 568 if (!fsc->wb_pagevec_pool) 569 goto fail_trunc_wq; 570 571 /* setup fscache */ 572 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 573 (ceph_fscache_register_fs(fsc) != 0)) 574 goto fail_fscache; 575 576 /* caps */ 577 fsc->min_caps = fsopt->max_readdir; 578 579 return fsc; 580 581 fail_fscache: 582 ceph_fscache_unregister_fs(fsc); 583 fail_trunc_wq: 584 destroy_workqueue(fsc->trunc_wq); 585 fail_pg_inv_wq: 586 destroy_workqueue(fsc->pg_inv_wq); 587 fail_wb_wq: 588 destroy_workqueue(fsc->wb_wq); 589 fail_bdi: 590 bdi_destroy(&fsc->backing_dev_info); 591 fail_client: 592 ceph_destroy_client(fsc->client); 593 fail: 594 kfree(fsc); 595 return ERR_PTR(err); 596 } 597 598 static void destroy_fs_client(struct ceph_fs_client *fsc) 599 { 600 dout("destroy_fs_client %p\n", fsc); 601 602 ceph_fscache_unregister_fs(fsc); 603 604 destroy_workqueue(fsc->wb_wq); 605 destroy_workqueue(fsc->pg_inv_wq); 606 destroy_workqueue(fsc->trunc_wq); 607 608 bdi_destroy(&fsc->backing_dev_info); 609 610 mempool_destroy(fsc->wb_pagevec_pool); 611 612 destroy_mount_options(fsc->mount_options); 613 614 ceph_fs_debugfs_cleanup(fsc); 615 616 ceph_destroy_client(fsc->client); 617 618 kfree(fsc); 619 dout("destroy_fs_client %p done\n", fsc); 620 } 621 622 /* 623 * caches 624 */ 625 struct kmem_cache *ceph_inode_cachep; 626 struct kmem_cache *ceph_cap_cachep; 627 struct kmem_cache *ceph_dentry_cachep; 628 struct kmem_cache *ceph_file_cachep; 629 630 static void ceph_inode_init_once(void *foo) 631 { 632 struct ceph_inode_info *ci = foo; 633 inode_init_once(&ci->vfs_inode); 634 } 635 636 static int __init init_caches(void) 637 { 638 int error = -ENOMEM; 639 640 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 641 sizeof(struct ceph_inode_info), 642 __alignof__(struct ceph_inode_info), 643 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 644 ceph_inode_init_once); 645 if (ceph_inode_cachep == NULL) 646 return -ENOMEM; 647 648 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 649 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 650 if (ceph_cap_cachep == NULL) 651 goto bad_cap; 652 653 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 654 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 655 if (ceph_dentry_cachep == NULL) 656 goto bad_dentry; 657 658 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 659 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 660 if (ceph_file_cachep == NULL) 661 goto bad_file; 662 663 if ((error = ceph_fscache_register())) 664 goto bad_file; 665 666 return 0; 667 bad_file: 668 kmem_cache_destroy(ceph_dentry_cachep); 669 bad_dentry: 670 kmem_cache_destroy(ceph_cap_cachep); 671 bad_cap: 672 kmem_cache_destroy(ceph_inode_cachep); 673 return error; 674 } 675 676 static void destroy_caches(void) 677 { 678 /* 679 * Make sure all delayed rcu free inodes are flushed before we 680 * destroy cache. 681 */ 682 rcu_barrier(); 683 684 kmem_cache_destroy(ceph_inode_cachep); 685 kmem_cache_destroy(ceph_cap_cachep); 686 kmem_cache_destroy(ceph_dentry_cachep); 687 kmem_cache_destroy(ceph_file_cachep); 688 689 ceph_fscache_unregister(); 690 } 691 692 693 /* 694 * ceph_umount_begin - initiate forced umount. Tear down down the 695 * mount, skipping steps that may hang while waiting for server(s). 696 */ 697 static void ceph_umount_begin(struct super_block *sb) 698 { 699 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 700 701 dout("ceph_umount_begin - starting forced umount\n"); 702 if (!fsc) 703 return; 704 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 705 return; 706 } 707 708 static const struct super_operations ceph_super_ops = { 709 .alloc_inode = ceph_alloc_inode, 710 .destroy_inode = ceph_destroy_inode, 711 .write_inode = ceph_write_inode, 712 .drop_inode = ceph_drop_inode, 713 .sync_fs = ceph_sync_fs, 714 .put_super = ceph_put_super, 715 .show_options = ceph_show_options, 716 .statfs = ceph_statfs, 717 .umount_begin = ceph_umount_begin, 718 }; 719 720 /* 721 * Bootstrap mount by opening the root directory. Note the mount 722 * @started time from caller, and time out if this takes too long. 723 */ 724 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 725 const char *path, 726 unsigned long started) 727 { 728 struct ceph_mds_client *mdsc = fsc->mdsc; 729 struct ceph_mds_request *req = NULL; 730 int err; 731 struct dentry *root; 732 733 /* open dir */ 734 dout("open_root_inode opening '%s'\n", path); 735 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 736 if (IS_ERR(req)) 737 return ERR_CAST(req); 738 req->r_path1 = kstrdup(path, GFP_NOFS); 739 req->r_ino1.ino = CEPH_INO_ROOT; 740 req->r_ino1.snap = CEPH_NOSNAP; 741 req->r_started = started; 742 req->r_timeout = fsc->client->options->mount_timeout * HZ; 743 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 744 req->r_num_caps = 2; 745 err = ceph_mdsc_do_request(mdsc, NULL, req); 746 if (err == 0) { 747 struct inode *inode = req->r_target_inode; 748 req->r_target_inode = NULL; 749 dout("open_root_inode success\n"); 750 if (ceph_ino(inode) == CEPH_INO_ROOT && 751 fsc->sb->s_root == NULL) { 752 root = d_make_root(inode); 753 if (!root) { 754 root = ERR_PTR(-ENOMEM); 755 goto out; 756 } 757 } else { 758 root = d_obtain_alias(inode); 759 } 760 ceph_init_dentry(root); 761 dout("open_root_inode success, root dentry is %p\n", root); 762 } else { 763 root = ERR_PTR(err); 764 } 765 out: 766 ceph_mdsc_put_request(req); 767 return root; 768 } 769 770 771 772 773 /* 774 * mount: join the ceph cluster, and open root directory. 775 */ 776 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 777 const char *path) 778 { 779 int err; 780 unsigned long started = jiffies; /* note the start time */ 781 struct dentry *root; 782 int first = 0; /* first vfsmount for this super_block */ 783 784 dout("mount start\n"); 785 mutex_lock(&fsc->client->mount_mutex); 786 787 err = __ceph_open_session(fsc->client, started); 788 if (err < 0) 789 goto out; 790 791 dout("mount opening root\n"); 792 root = open_root_dentry(fsc, "", started); 793 if (IS_ERR(root)) { 794 err = PTR_ERR(root); 795 goto out; 796 } 797 if (fsc->sb->s_root) { 798 dput(root); 799 } else { 800 fsc->sb->s_root = root; 801 first = 1; 802 803 err = ceph_fs_debugfs_init(fsc); 804 if (err < 0) 805 goto fail; 806 } 807 808 if (path[0] == 0) { 809 dget(root); 810 } else { 811 dout("mount opening base mountpoint\n"); 812 root = open_root_dentry(fsc, path, started); 813 if (IS_ERR(root)) { 814 err = PTR_ERR(root); 815 goto fail; 816 } 817 } 818 819 fsc->mount_state = CEPH_MOUNT_MOUNTED; 820 dout("mount success\n"); 821 mutex_unlock(&fsc->client->mount_mutex); 822 return root; 823 824 out: 825 mutex_unlock(&fsc->client->mount_mutex); 826 return ERR_PTR(err); 827 828 fail: 829 if (first) { 830 dput(fsc->sb->s_root); 831 fsc->sb->s_root = NULL; 832 } 833 goto out; 834 } 835 836 static int ceph_set_super(struct super_block *s, void *data) 837 { 838 struct ceph_fs_client *fsc = data; 839 int ret; 840 841 dout("set_super %p data %p\n", s, data); 842 843 s->s_flags = fsc->mount_options->sb_flags; 844 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 845 846 s->s_xattr = ceph_xattr_handlers; 847 s->s_fs_info = fsc; 848 fsc->sb = s; 849 850 s->s_op = &ceph_super_ops; 851 s->s_export_op = &ceph_export_ops; 852 853 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 854 855 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 856 if (ret != 0) 857 goto fail; 858 859 return ret; 860 861 fail: 862 s->s_fs_info = NULL; 863 fsc->sb = NULL; 864 return ret; 865 } 866 867 /* 868 * share superblock if same fs AND options 869 */ 870 static int ceph_compare_super(struct super_block *sb, void *data) 871 { 872 struct ceph_fs_client *new = data; 873 struct ceph_mount_options *fsopt = new->mount_options; 874 struct ceph_options *opt = new->client->options; 875 struct ceph_fs_client *other = ceph_sb_to_client(sb); 876 877 dout("ceph_compare_super %p\n", sb); 878 879 if (compare_mount_options(fsopt, opt, other)) { 880 dout("monitor(s)/mount options don't match\n"); 881 return 0; 882 } 883 if ((opt->flags & CEPH_OPT_FSID) && 884 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 885 dout("fsid doesn't match\n"); 886 return 0; 887 } 888 if (fsopt->sb_flags != other->mount_options->sb_flags) { 889 dout("flags differ\n"); 890 return 0; 891 } 892 return 1; 893 } 894 895 /* 896 * construct our own bdi so we can control readahead, etc. 897 */ 898 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 899 900 static int ceph_register_bdi(struct super_block *sb, 901 struct ceph_fs_client *fsc) 902 { 903 int err; 904 905 /* set ra_pages based on rasize mount option? */ 906 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 907 fsc->backing_dev_info.ra_pages = 908 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 909 >> PAGE_SHIFT; 910 else 911 fsc->backing_dev_info.ra_pages = 912 default_backing_dev_info.ra_pages; 913 914 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 915 atomic_long_inc_return(&bdi_seq)); 916 if (!err) 917 sb->s_bdi = &fsc->backing_dev_info; 918 return err; 919 } 920 921 static struct dentry *ceph_mount(struct file_system_type *fs_type, 922 int flags, const char *dev_name, void *data) 923 { 924 struct super_block *sb; 925 struct ceph_fs_client *fsc; 926 struct dentry *res; 927 int err; 928 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 929 const char *path = NULL; 930 struct ceph_mount_options *fsopt = NULL; 931 struct ceph_options *opt = NULL; 932 933 dout("ceph_mount\n"); 934 935 #ifdef CONFIG_CEPH_FS_POSIX_ACL 936 flags |= MS_POSIXACL; 937 #endif 938 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 939 if (err < 0) { 940 res = ERR_PTR(err); 941 goto out_final; 942 } 943 944 /* create client (which we may/may not use) */ 945 fsc = create_fs_client(fsopt, opt); 946 if (IS_ERR(fsc)) { 947 res = ERR_CAST(fsc); 948 destroy_mount_options(fsopt); 949 ceph_destroy_options(opt); 950 goto out_final; 951 } 952 953 err = ceph_mdsc_init(fsc); 954 if (err < 0) { 955 res = ERR_PTR(err); 956 goto out; 957 } 958 959 if (ceph_test_opt(fsc->client, NOSHARE)) 960 compare_super = NULL; 961 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 962 if (IS_ERR(sb)) { 963 res = ERR_CAST(sb); 964 goto out; 965 } 966 967 if (ceph_sb_to_client(sb) != fsc) { 968 ceph_mdsc_destroy(fsc); 969 destroy_fs_client(fsc); 970 fsc = ceph_sb_to_client(sb); 971 dout("get_sb got existing client %p\n", fsc); 972 } else { 973 dout("get_sb using new client %p\n", fsc); 974 err = ceph_register_bdi(sb, fsc); 975 if (err < 0) { 976 res = ERR_PTR(err); 977 goto out_splat; 978 } 979 } 980 981 res = ceph_real_mount(fsc, path); 982 if (IS_ERR(res)) 983 goto out_splat; 984 dout("root %p inode %p ino %llx.%llx\n", res, 985 res->d_inode, ceph_vinop(res->d_inode)); 986 return res; 987 988 out_splat: 989 ceph_mdsc_close_sessions(fsc->mdsc); 990 deactivate_locked_super(sb); 991 goto out_final; 992 993 out: 994 ceph_mdsc_destroy(fsc); 995 destroy_fs_client(fsc); 996 out_final: 997 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 998 return res; 999 } 1000 1001 static void ceph_kill_sb(struct super_block *s) 1002 { 1003 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1004 dout("kill_sb %p\n", s); 1005 ceph_mdsc_pre_umount(fsc->mdsc); 1006 kill_anon_super(s); /* will call put_super after sb is r/o */ 1007 ceph_mdsc_destroy(fsc); 1008 destroy_fs_client(fsc); 1009 } 1010 1011 static struct file_system_type ceph_fs_type = { 1012 .owner = THIS_MODULE, 1013 .name = "ceph", 1014 .mount = ceph_mount, 1015 .kill_sb = ceph_kill_sb, 1016 .fs_flags = FS_RENAME_DOES_D_MOVE, 1017 }; 1018 MODULE_ALIAS_FS("ceph"); 1019 1020 #define _STRINGIFY(x) #x 1021 #define STRINGIFY(x) _STRINGIFY(x) 1022 1023 static int __init init_ceph(void) 1024 { 1025 int ret = init_caches(); 1026 if (ret) 1027 goto out; 1028 1029 ceph_flock_init(); 1030 ceph_xattr_init(); 1031 ret = register_filesystem(&ceph_fs_type); 1032 if (ret) 1033 goto out_icache; 1034 1035 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1036 1037 return 0; 1038 1039 out_icache: 1040 ceph_xattr_exit(); 1041 destroy_caches(); 1042 out: 1043 return ret; 1044 } 1045 1046 static void __exit exit_ceph(void) 1047 { 1048 dout("exit_ceph\n"); 1049 unregister_filesystem(&ceph_fs_type); 1050 ceph_xattr_exit(); 1051 destroy_caches(); 1052 } 1053 1054 module_init(init_ceph); 1055 module_exit(exit_ceph); 1056 1057 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1058 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1059 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1060 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1061 MODULE_LICENSE("GPL"); 1062