1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/ctype.h> 6 #include <linux/fs.h> 7 #include <linux/inet.h> 8 #include <linux/in6.h> 9 #include <linux/module.h> 10 #include <linux/mount.h> 11 #include <linux/parser.h> 12 #include <linux/sched.h> 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <linux/statfs.h> 16 #include <linux/string.h> 17 18 #include "super.h" 19 #include "mds_client.h" 20 21 #include <linux/ceph/ceph_features.h> 22 #include <linux/ceph/decode.h> 23 #include <linux/ceph/mon_client.h> 24 #include <linux/ceph/auth.h> 25 #include <linux/ceph/debugfs.h> 26 27 /* 28 * Ceph superblock operations 29 * 30 * Handle the basics of mounting, unmounting. 31 */ 32 33 /* 34 * super ops 35 */ 36 static void ceph_put_super(struct super_block *s) 37 { 38 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 39 40 dout("put_super\n"); 41 ceph_mdsc_close_sessions(fsc->mdsc); 42 43 /* 44 * ensure we release the bdi before put_anon_super releases 45 * the device name. 46 */ 47 if (s->s_bdi == &fsc->backing_dev_info) { 48 bdi_unregister(&fsc->backing_dev_info); 49 s->s_bdi = NULL; 50 } 51 52 return; 53 } 54 55 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 56 { 57 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode); 58 struct ceph_monmap *monmap = fsc->client->monc.monmap; 59 struct ceph_statfs st; 60 u64 fsid; 61 int err; 62 63 dout("statfs\n"); 64 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 65 if (err < 0) 66 return err; 67 68 /* fill in kstatfs */ 69 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 70 71 /* 72 * express utilization in terms of large blocks to avoid 73 * overflow on 32-bit machines. 74 * 75 * NOTE: for the time being, we make bsize == frsize to humor 76 * not-yet-ancient versions of glibc that are broken. 77 * Someday, we will probably want to report a real block 78 * size... whatever that may mean for a network file system! 79 */ 80 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 81 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 82 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 83 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 84 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 85 86 buf->f_files = le64_to_cpu(st.num_objects); 87 buf->f_ffree = -1; 88 buf->f_namelen = NAME_MAX; 89 90 /* leave fsid little-endian, regardless of host endianness */ 91 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 92 buf->f_fsid.val[0] = fsid & 0xffffffff; 93 buf->f_fsid.val[1] = fsid >> 32; 94 95 return 0; 96 } 97 98 99 static int ceph_sync_fs(struct super_block *sb, int wait) 100 { 101 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 102 103 if (!wait) { 104 dout("sync_fs (non-blocking)\n"); 105 ceph_flush_dirty_caps(fsc->mdsc); 106 dout("sync_fs (non-blocking) done\n"); 107 return 0; 108 } 109 110 dout("sync_fs (blocking)\n"); 111 ceph_osdc_sync(&fsc->client->osdc); 112 ceph_mdsc_sync(fsc->mdsc); 113 dout("sync_fs (blocking) done\n"); 114 return 0; 115 } 116 117 /* 118 * mount options 119 */ 120 enum { 121 Opt_wsize, 122 Opt_rsize, 123 Opt_rasize, 124 Opt_caps_wanted_delay_min, 125 Opt_caps_wanted_delay_max, 126 Opt_cap_release_safety, 127 Opt_readdir_max_entries, 128 Opt_readdir_max_bytes, 129 Opt_congestion_kb, 130 Opt_last_int, 131 /* int args above */ 132 Opt_snapdirname, 133 Opt_last_string, 134 /* string args above */ 135 Opt_dirstat, 136 Opt_nodirstat, 137 Opt_rbytes, 138 Opt_norbytes, 139 Opt_asyncreaddir, 140 Opt_noasyncreaddir, 141 Opt_dcache, 142 Opt_nodcache, 143 Opt_ino32, 144 Opt_noino32, 145 }; 146 147 static match_table_t fsopt_tokens = { 148 {Opt_wsize, "wsize=%d"}, 149 {Opt_rsize, "rsize=%d"}, 150 {Opt_rasize, "rasize=%d"}, 151 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 152 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 153 {Opt_cap_release_safety, "cap_release_safety=%d"}, 154 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 155 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 156 {Opt_congestion_kb, "write_congestion_kb=%d"}, 157 /* int args above */ 158 {Opt_snapdirname, "snapdirname=%s"}, 159 /* string args above */ 160 {Opt_dirstat, "dirstat"}, 161 {Opt_nodirstat, "nodirstat"}, 162 {Opt_rbytes, "rbytes"}, 163 {Opt_norbytes, "norbytes"}, 164 {Opt_asyncreaddir, "asyncreaddir"}, 165 {Opt_noasyncreaddir, "noasyncreaddir"}, 166 {Opt_dcache, "dcache"}, 167 {Opt_nodcache, "nodcache"}, 168 {Opt_ino32, "ino32"}, 169 {Opt_noino32, "noino32"}, 170 {-1, NULL} 171 }; 172 173 static int parse_fsopt_token(char *c, void *private) 174 { 175 struct ceph_mount_options *fsopt = private; 176 substring_t argstr[MAX_OPT_ARGS]; 177 int token, intval, ret; 178 179 token = match_token((char *)c, fsopt_tokens, argstr); 180 if (token < 0) 181 return -EINVAL; 182 183 if (token < Opt_last_int) { 184 ret = match_int(&argstr[0], &intval); 185 if (ret < 0) { 186 pr_err("bad mount option arg (not int) " 187 "at '%s'\n", c); 188 return ret; 189 } 190 dout("got int token %d val %d\n", token, intval); 191 } else if (token > Opt_last_int && token < Opt_last_string) { 192 dout("got string token %d val %s\n", token, 193 argstr[0].from); 194 } else { 195 dout("got token %d\n", token); 196 } 197 198 switch (token) { 199 case Opt_snapdirname: 200 kfree(fsopt->snapdir_name); 201 fsopt->snapdir_name = kstrndup(argstr[0].from, 202 argstr[0].to-argstr[0].from, 203 GFP_KERNEL); 204 if (!fsopt->snapdir_name) 205 return -ENOMEM; 206 break; 207 208 /* misc */ 209 case Opt_wsize: 210 fsopt->wsize = intval; 211 break; 212 case Opt_rsize: 213 fsopt->rsize = intval; 214 break; 215 case Opt_rasize: 216 fsopt->rasize = intval; 217 break; 218 case Opt_caps_wanted_delay_min: 219 fsopt->caps_wanted_delay_min = intval; 220 break; 221 case Opt_caps_wanted_delay_max: 222 fsopt->caps_wanted_delay_max = intval; 223 break; 224 case Opt_readdir_max_entries: 225 fsopt->max_readdir = intval; 226 break; 227 case Opt_readdir_max_bytes: 228 fsopt->max_readdir_bytes = intval; 229 break; 230 case Opt_congestion_kb: 231 fsopt->congestion_kb = intval; 232 break; 233 case Opt_dirstat: 234 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 235 break; 236 case Opt_nodirstat: 237 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 238 break; 239 case Opt_rbytes: 240 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 241 break; 242 case Opt_norbytes: 243 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 244 break; 245 case Opt_asyncreaddir: 246 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 247 break; 248 case Opt_noasyncreaddir: 249 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 250 break; 251 case Opt_dcache: 252 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 253 break; 254 case Opt_nodcache: 255 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 256 break; 257 case Opt_ino32: 258 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 259 break; 260 case Opt_noino32: 261 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 262 break; 263 default: 264 BUG_ON(token); 265 } 266 return 0; 267 } 268 269 static void destroy_mount_options(struct ceph_mount_options *args) 270 { 271 dout("destroy_mount_options %p\n", args); 272 kfree(args->snapdir_name); 273 kfree(args); 274 } 275 276 static int strcmp_null(const char *s1, const char *s2) 277 { 278 if (!s1 && !s2) 279 return 0; 280 if (s1 && !s2) 281 return -1; 282 if (!s1 && s2) 283 return 1; 284 return strcmp(s1, s2); 285 } 286 287 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 288 struct ceph_options *new_opt, 289 struct ceph_fs_client *fsc) 290 { 291 struct ceph_mount_options *fsopt1 = new_fsopt; 292 struct ceph_mount_options *fsopt2 = fsc->mount_options; 293 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 294 int ret; 295 296 ret = memcmp(fsopt1, fsopt2, ofs); 297 if (ret) 298 return ret; 299 300 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 301 if (ret) 302 return ret; 303 304 return ceph_compare_options(new_opt, fsc->client); 305 } 306 307 static int parse_mount_options(struct ceph_mount_options **pfsopt, 308 struct ceph_options **popt, 309 int flags, char *options, 310 const char *dev_name, 311 const char **path) 312 { 313 struct ceph_mount_options *fsopt; 314 const char *dev_name_end; 315 int err; 316 317 if (!dev_name || !*dev_name) 318 return -EINVAL; 319 320 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 321 if (!fsopt) 322 return -ENOMEM; 323 324 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 325 326 fsopt->sb_flags = flags; 327 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 328 329 fsopt->rsize = CEPH_RSIZE_DEFAULT; 330 fsopt->rasize = CEPH_RASIZE_DEFAULT; 331 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 332 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 333 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 334 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 335 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 336 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 337 fsopt->congestion_kb = default_congestion_kb(); 338 339 /* 340 * Distinguish the server list from the path in "dev_name". 341 * Internally we do not include the leading '/' in the path. 342 * 343 * "dev_name" will look like: 344 * <server_spec>[,<server_spec>...]:[<path>] 345 * where 346 * <server_spec> is <ip>[:<port>] 347 * <path> is optional, but if present must begin with '/' 348 */ 349 dev_name_end = strchr(dev_name, '/'); 350 if (dev_name_end) { 351 /* skip over leading '/' for path */ 352 *path = dev_name_end + 1; 353 } else { 354 /* path is empty */ 355 dev_name_end = dev_name + strlen(dev_name); 356 *path = dev_name_end; 357 } 358 err = -EINVAL; 359 dev_name_end--; /* back up to ':' separator */ 360 if (*dev_name_end != ':') { 361 pr_err("device name is missing path (no : separator in %s)\n", 362 dev_name); 363 goto out; 364 } 365 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 366 dout("server path '%s'\n", *path); 367 368 *popt = ceph_parse_options(options, dev_name, dev_name_end, 369 parse_fsopt_token, (void *)fsopt); 370 if (IS_ERR(*popt)) { 371 err = PTR_ERR(*popt); 372 goto out; 373 } 374 375 /* success */ 376 *pfsopt = fsopt; 377 return 0; 378 379 out: 380 destroy_mount_options(fsopt); 381 return err; 382 } 383 384 /** 385 * ceph_show_options - Show mount options in /proc/mounts 386 * @m: seq_file to write to 387 * @root: root of that (sub)tree 388 */ 389 static int ceph_show_options(struct seq_file *m, struct dentry *root) 390 { 391 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 392 struct ceph_mount_options *fsopt = fsc->mount_options; 393 struct ceph_options *opt = fsc->client->options; 394 395 if (opt->flags & CEPH_OPT_FSID) 396 seq_printf(m, ",fsid=%pU", &opt->fsid); 397 if (opt->flags & CEPH_OPT_NOSHARE) 398 seq_puts(m, ",noshare"); 399 if (opt->flags & CEPH_OPT_NOCRC) 400 seq_puts(m, ",nocrc"); 401 402 if (opt->name) 403 seq_printf(m, ",name=%s", opt->name); 404 if (opt->key) 405 seq_puts(m, ",secret=<hidden>"); 406 407 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 408 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 409 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 410 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 411 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 412 seq_printf(m, ",osdkeepalivetimeout=%d", 413 opt->osd_keepalive_timeout); 414 415 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 416 seq_puts(m, ",dirstat"); 417 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 418 seq_puts(m, ",norbytes"); 419 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 420 seq_puts(m, ",noasyncreaddir"); 421 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 422 seq_puts(m, ",dcache"); 423 else 424 seq_puts(m, ",nodcache"); 425 426 if (fsopt->wsize) 427 seq_printf(m, ",wsize=%d", fsopt->wsize); 428 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 429 seq_printf(m, ",rsize=%d", fsopt->rsize); 430 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 431 seq_printf(m, ",rasize=%d", fsopt->rasize); 432 if (fsopt->congestion_kb != default_congestion_kb()) 433 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 434 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 435 seq_printf(m, ",caps_wanted_delay_min=%d", 436 fsopt->caps_wanted_delay_min); 437 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 438 seq_printf(m, ",caps_wanted_delay_max=%d", 439 fsopt->caps_wanted_delay_max); 440 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 441 seq_printf(m, ",cap_release_safety=%d", 442 fsopt->cap_release_safety); 443 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 444 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 445 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 446 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 447 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 448 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 449 return 0; 450 } 451 452 /* 453 * handle any mon messages the standard library doesn't understand. 454 * return error if we don't either. 455 */ 456 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 457 { 458 struct ceph_fs_client *fsc = client->private; 459 int type = le16_to_cpu(msg->hdr.type); 460 461 switch (type) { 462 case CEPH_MSG_MDS_MAP: 463 ceph_mdsc_handle_map(fsc->mdsc, msg); 464 return 0; 465 466 default: 467 return -1; 468 } 469 } 470 471 /* 472 * create a new fs client 473 */ 474 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 475 struct ceph_options *opt) 476 { 477 struct ceph_fs_client *fsc; 478 const unsigned supported_features = 479 CEPH_FEATURE_FLOCK | 480 CEPH_FEATURE_DIRLAYOUTHASH; 481 const unsigned required_features = 0; 482 int err = -ENOMEM; 483 484 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 485 if (!fsc) 486 return ERR_PTR(-ENOMEM); 487 488 fsc->client = ceph_create_client(opt, fsc, supported_features, 489 required_features); 490 if (IS_ERR(fsc->client)) { 491 err = PTR_ERR(fsc->client); 492 goto fail; 493 } 494 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 495 fsc->client->monc.want_mdsmap = 1; 496 497 fsc->mount_options = fsopt; 498 499 fsc->sb = NULL; 500 fsc->mount_state = CEPH_MOUNT_MOUNTING; 501 502 atomic_long_set(&fsc->writeback_count, 0); 503 504 err = bdi_init(&fsc->backing_dev_info); 505 if (err < 0) 506 goto fail_client; 507 508 err = -ENOMEM; 509 /* 510 * The number of concurrent works can be high but they don't need 511 * to be processed in parallel, limit concurrency. 512 */ 513 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 514 if (fsc->wb_wq == NULL) 515 goto fail_bdi; 516 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 517 if (fsc->pg_inv_wq == NULL) 518 goto fail_wb_wq; 519 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 520 if (fsc->trunc_wq == NULL) 521 goto fail_pg_inv_wq; 522 523 /* set up mempools */ 524 err = -ENOMEM; 525 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 526 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); 527 if (!fsc->wb_pagevec_pool) 528 goto fail_trunc_wq; 529 530 /* caps */ 531 fsc->min_caps = fsopt->max_readdir; 532 533 return fsc; 534 535 fail_trunc_wq: 536 destroy_workqueue(fsc->trunc_wq); 537 fail_pg_inv_wq: 538 destroy_workqueue(fsc->pg_inv_wq); 539 fail_wb_wq: 540 destroy_workqueue(fsc->wb_wq); 541 fail_bdi: 542 bdi_destroy(&fsc->backing_dev_info); 543 fail_client: 544 ceph_destroy_client(fsc->client); 545 fail: 546 kfree(fsc); 547 return ERR_PTR(err); 548 } 549 550 static void destroy_fs_client(struct ceph_fs_client *fsc) 551 { 552 dout("destroy_fs_client %p\n", fsc); 553 554 destroy_workqueue(fsc->wb_wq); 555 destroy_workqueue(fsc->pg_inv_wq); 556 destroy_workqueue(fsc->trunc_wq); 557 558 bdi_destroy(&fsc->backing_dev_info); 559 560 mempool_destroy(fsc->wb_pagevec_pool); 561 562 destroy_mount_options(fsc->mount_options); 563 564 ceph_fs_debugfs_cleanup(fsc); 565 566 ceph_destroy_client(fsc->client); 567 568 kfree(fsc); 569 dout("destroy_fs_client %p done\n", fsc); 570 } 571 572 /* 573 * caches 574 */ 575 struct kmem_cache *ceph_inode_cachep; 576 struct kmem_cache *ceph_cap_cachep; 577 struct kmem_cache *ceph_dentry_cachep; 578 struct kmem_cache *ceph_file_cachep; 579 580 static void ceph_inode_init_once(void *foo) 581 { 582 struct ceph_inode_info *ci = foo; 583 inode_init_once(&ci->vfs_inode); 584 } 585 586 static int __init init_caches(void) 587 { 588 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 589 sizeof(struct ceph_inode_info), 590 __alignof__(struct ceph_inode_info), 591 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 592 ceph_inode_init_once); 593 if (ceph_inode_cachep == NULL) 594 return -ENOMEM; 595 596 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 597 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 598 if (ceph_cap_cachep == NULL) 599 goto bad_cap; 600 601 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 602 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 603 if (ceph_dentry_cachep == NULL) 604 goto bad_dentry; 605 606 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 607 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 608 if (ceph_file_cachep == NULL) 609 goto bad_file; 610 611 return 0; 612 613 bad_file: 614 kmem_cache_destroy(ceph_dentry_cachep); 615 bad_dentry: 616 kmem_cache_destroy(ceph_cap_cachep); 617 bad_cap: 618 kmem_cache_destroy(ceph_inode_cachep); 619 return -ENOMEM; 620 } 621 622 static void destroy_caches(void) 623 { 624 /* 625 * Make sure all delayed rcu free inodes are flushed before we 626 * destroy cache. 627 */ 628 rcu_barrier(); 629 kmem_cache_destroy(ceph_inode_cachep); 630 kmem_cache_destroy(ceph_cap_cachep); 631 kmem_cache_destroy(ceph_dentry_cachep); 632 kmem_cache_destroy(ceph_file_cachep); 633 } 634 635 636 /* 637 * ceph_umount_begin - initiate forced umount. Tear down down the 638 * mount, skipping steps that may hang while waiting for server(s). 639 */ 640 static void ceph_umount_begin(struct super_block *sb) 641 { 642 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 643 644 dout("ceph_umount_begin - starting forced umount\n"); 645 if (!fsc) 646 return; 647 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 648 return; 649 } 650 651 static const struct super_operations ceph_super_ops = { 652 .alloc_inode = ceph_alloc_inode, 653 .destroy_inode = ceph_destroy_inode, 654 .write_inode = ceph_write_inode, 655 .sync_fs = ceph_sync_fs, 656 .put_super = ceph_put_super, 657 .show_options = ceph_show_options, 658 .statfs = ceph_statfs, 659 .umount_begin = ceph_umount_begin, 660 }; 661 662 /* 663 * Bootstrap mount by opening the root directory. Note the mount 664 * @started time from caller, and time out if this takes too long. 665 */ 666 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 667 const char *path, 668 unsigned long started) 669 { 670 struct ceph_mds_client *mdsc = fsc->mdsc; 671 struct ceph_mds_request *req = NULL; 672 int err; 673 struct dentry *root; 674 675 /* open dir */ 676 dout("open_root_inode opening '%s'\n", path); 677 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 678 if (IS_ERR(req)) 679 return ERR_CAST(req); 680 req->r_path1 = kstrdup(path, GFP_NOFS); 681 req->r_ino1.ino = CEPH_INO_ROOT; 682 req->r_ino1.snap = CEPH_NOSNAP; 683 req->r_started = started; 684 req->r_timeout = fsc->client->options->mount_timeout * HZ; 685 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 686 req->r_num_caps = 2; 687 err = ceph_mdsc_do_request(mdsc, NULL, req); 688 if (err == 0) { 689 struct inode *inode = req->r_target_inode; 690 req->r_target_inode = NULL; 691 dout("open_root_inode success\n"); 692 if (ceph_ino(inode) == CEPH_INO_ROOT && 693 fsc->sb->s_root == NULL) { 694 root = d_make_root(inode); 695 if (!root) { 696 root = ERR_PTR(-ENOMEM); 697 goto out; 698 } 699 } else { 700 root = d_obtain_alias(inode); 701 } 702 ceph_init_dentry(root); 703 dout("open_root_inode success, root dentry is %p\n", root); 704 } else { 705 root = ERR_PTR(err); 706 } 707 out: 708 ceph_mdsc_put_request(req); 709 return root; 710 } 711 712 713 714 715 /* 716 * mount: join the ceph cluster, and open root directory. 717 */ 718 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 719 const char *path) 720 { 721 int err; 722 unsigned long started = jiffies; /* note the start time */ 723 struct dentry *root; 724 int first = 0; /* first vfsmount for this super_block */ 725 726 dout("mount start\n"); 727 mutex_lock(&fsc->client->mount_mutex); 728 729 err = __ceph_open_session(fsc->client, started); 730 if (err < 0) 731 goto out; 732 733 dout("mount opening root\n"); 734 root = open_root_dentry(fsc, "", started); 735 if (IS_ERR(root)) { 736 err = PTR_ERR(root); 737 goto out; 738 } 739 if (fsc->sb->s_root) { 740 dput(root); 741 } else { 742 fsc->sb->s_root = root; 743 first = 1; 744 745 err = ceph_fs_debugfs_init(fsc); 746 if (err < 0) 747 goto fail; 748 } 749 750 if (path[0] == 0) { 751 dget(root); 752 } else { 753 dout("mount opening base mountpoint\n"); 754 root = open_root_dentry(fsc, path, started); 755 if (IS_ERR(root)) { 756 err = PTR_ERR(root); 757 goto fail; 758 } 759 } 760 761 fsc->mount_state = CEPH_MOUNT_MOUNTED; 762 dout("mount success\n"); 763 mutex_unlock(&fsc->client->mount_mutex); 764 return root; 765 766 out: 767 mutex_unlock(&fsc->client->mount_mutex); 768 return ERR_PTR(err); 769 770 fail: 771 if (first) { 772 dput(fsc->sb->s_root); 773 fsc->sb->s_root = NULL; 774 } 775 goto out; 776 } 777 778 static int ceph_set_super(struct super_block *s, void *data) 779 { 780 struct ceph_fs_client *fsc = data; 781 int ret; 782 783 dout("set_super %p data %p\n", s, data); 784 785 s->s_flags = fsc->mount_options->sb_flags; 786 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 787 788 s->s_fs_info = fsc; 789 fsc->sb = s; 790 791 s->s_op = &ceph_super_ops; 792 s->s_export_op = &ceph_export_ops; 793 794 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 795 796 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 797 if (ret != 0) 798 goto fail; 799 800 return ret; 801 802 fail: 803 s->s_fs_info = NULL; 804 fsc->sb = NULL; 805 return ret; 806 } 807 808 /* 809 * share superblock if same fs AND options 810 */ 811 static int ceph_compare_super(struct super_block *sb, void *data) 812 { 813 struct ceph_fs_client *new = data; 814 struct ceph_mount_options *fsopt = new->mount_options; 815 struct ceph_options *opt = new->client->options; 816 struct ceph_fs_client *other = ceph_sb_to_client(sb); 817 818 dout("ceph_compare_super %p\n", sb); 819 820 if (compare_mount_options(fsopt, opt, other)) { 821 dout("monitor(s)/mount options don't match\n"); 822 return 0; 823 } 824 if ((opt->flags & CEPH_OPT_FSID) && 825 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 826 dout("fsid doesn't match\n"); 827 return 0; 828 } 829 if (fsopt->sb_flags != other->mount_options->sb_flags) { 830 dout("flags differ\n"); 831 return 0; 832 } 833 return 1; 834 } 835 836 /* 837 * construct our own bdi so we can control readahead, etc. 838 */ 839 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 840 841 static int ceph_register_bdi(struct super_block *sb, 842 struct ceph_fs_client *fsc) 843 { 844 int err; 845 846 /* set ra_pages based on rasize mount option? */ 847 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 848 fsc->backing_dev_info.ra_pages = 849 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 850 >> PAGE_SHIFT; 851 else 852 fsc->backing_dev_info.ra_pages = 853 default_backing_dev_info.ra_pages; 854 855 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 856 atomic_long_inc_return(&bdi_seq)); 857 if (!err) 858 sb->s_bdi = &fsc->backing_dev_info; 859 return err; 860 } 861 862 static struct dentry *ceph_mount(struct file_system_type *fs_type, 863 int flags, const char *dev_name, void *data) 864 { 865 struct super_block *sb; 866 struct ceph_fs_client *fsc; 867 struct dentry *res; 868 int err; 869 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 870 const char *path = NULL; 871 struct ceph_mount_options *fsopt = NULL; 872 struct ceph_options *opt = NULL; 873 874 dout("ceph_mount\n"); 875 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 876 if (err < 0) { 877 res = ERR_PTR(err); 878 goto out_final; 879 } 880 881 /* create client (which we may/may not use) */ 882 fsc = create_fs_client(fsopt, opt); 883 if (IS_ERR(fsc)) { 884 res = ERR_CAST(fsc); 885 destroy_mount_options(fsopt); 886 ceph_destroy_options(opt); 887 goto out_final; 888 } 889 890 err = ceph_mdsc_init(fsc); 891 if (err < 0) { 892 res = ERR_PTR(err); 893 goto out; 894 } 895 896 if (ceph_test_opt(fsc->client, NOSHARE)) 897 compare_super = NULL; 898 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 899 if (IS_ERR(sb)) { 900 res = ERR_CAST(sb); 901 goto out; 902 } 903 904 if (ceph_sb_to_client(sb) != fsc) { 905 ceph_mdsc_destroy(fsc); 906 destroy_fs_client(fsc); 907 fsc = ceph_sb_to_client(sb); 908 dout("get_sb got existing client %p\n", fsc); 909 } else { 910 dout("get_sb using new client %p\n", fsc); 911 err = ceph_register_bdi(sb, fsc); 912 if (err < 0) { 913 res = ERR_PTR(err); 914 goto out_splat; 915 } 916 } 917 918 res = ceph_real_mount(fsc, path); 919 if (IS_ERR(res)) 920 goto out_splat; 921 dout("root %p inode %p ino %llx.%llx\n", res, 922 res->d_inode, ceph_vinop(res->d_inode)); 923 return res; 924 925 out_splat: 926 ceph_mdsc_close_sessions(fsc->mdsc); 927 deactivate_locked_super(sb); 928 goto out_final; 929 930 out: 931 ceph_mdsc_destroy(fsc); 932 destroy_fs_client(fsc); 933 out_final: 934 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 935 return res; 936 } 937 938 static void ceph_kill_sb(struct super_block *s) 939 { 940 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 941 dout("kill_sb %p\n", s); 942 ceph_mdsc_pre_umount(fsc->mdsc); 943 kill_anon_super(s); /* will call put_super after sb is r/o */ 944 ceph_mdsc_destroy(fsc); 945 destroy_fs_client(fsc); 946 } 947 948 static struct file_system_type ceph_fs_type = { 949 .owner = THIS_MODULE, 950 .name = "ceph", 951 .mount = ceph_mount, 952 .kill_sb = ceph_kill_sb, 953 .fs_flags = FS_RENAME_DOES_D_MOVE, 954 }; 955 MODULE_ALIAS_FS("ceph"); 956 957 #define _STRINGIFY(x) #x 958 #define STRINGIFY(x) _STRINGIFY(x) 959 960 static int __init init_ceph(void) 961 { 962 int ret = init_caches(); 963 if (ret) 964 goto out; 965 966 ceph_xattr_init(); 967 ret = register_filesystem(&ceph_fs_type); 968 if (ret) 969 goto out_icache; 970 971 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 972 973 return 0; 974 975 out_icache: 976 ceph_xattr_exit(); 977 destroy_caches(); 978 out: 979 return ret; 980 } 981 982 static void __exit exit_ceph(void) 983 { 984 dout("exit_ceph\n"); 985 unregister_filesystem(&ceph_fs_type); 986 ceph_xattr_exit(); 987 destroy_caches(); 988 } 989 990 module_init(init_ceph); 991 module_exit(exit_ceph); 992 993 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 994 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 995 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 996 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 997 MODULE_LICENSE("GPL"); 998