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 page_count; 483 size_t size; 484 int err = -ENOMEM; 485 486 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 487 if (!fsc) 488 return ERR_PTR(-ENOMEM); 489 490 fsc->client = ceph_create_client(opt, fsc, supported_features, 491 required_features); 492 if (IS_ERR(fsc->client)) { 493 err = PTR_ERR(fsc->client); 494 goto fail; 495 } 496 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 497 fsc->client->monc.want_mdsmap = 1; 498 499 fsc->mount_options = fsopt; 500 501 fsc->sb = NULL; 502 fsc->mount_state = CEPH_MOUNT_MOUNTING; 503 504 atomic_long_set(&fsc->writeback_count, 0); 505 506 err = bdi_init(&fsc->backing_dev_info); 507 if (err < 0) 508 goto fail_client; 509 510 err = -ENOMEM; 511 /* 512 * The number of concurrent works can be high but they don't need 513 * to be processed in parallel, limit concurrency. 514 */ 515 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 516 if (fsc->wb_wq == NULL) 517 goto fail_bdi; 518 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 519 if (fsc->pg_inv_wq == NULL) 520 goto fail_wb_wq; 521 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 522 if (fsc->trunc_wq == NULL) 523 goto fail_pg_inv_wq; 524 525 /* set up mempools */ 526 err = -ENOMEM; 527 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 528 size = sizeof (struct page *) * (page_count ? page_count : 1); 529 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 530 if (!fsc->wb_pagevec_pool) 531 goto fail_trunc_wq; 532 533 /* caps */ 534 fsc->min_caps = fsopt->max_readdir; 535 536 return fsc; 537 538 fail_trunc_wq: 539 destroy_workqueue(fsc->trunc_wq); 540 fail_pg_inv_wq: 541 destroy_workqueue(fsc->pg_inv_wq); 542 fail_wb_wq: 543 destroy_workqueue(fsc->wb_wq); 544 fail_bdi: 545 bdi_destroy(&fsc->backing_dev_info); 546 fail_client: 547 ceph_destroy_client(fsc->client); 548 fail: 549 kfree(fsc); 550 return ERR_PTR(err); 551 } 552 553 static void destroy_fs_client(struct ceph_fs_client *fsc) 554 { 555 dout("destroy_fs_client %p\n", fsc); 556 557 destroy_workqueue(fsc->wb_wq); 558 destroy_workqueue(fsc->pg_inv_wq); 559 destroy_workqueue(fsc->trunc_wq); 560 561 bdi_destroy(&fsc->backing_dev_info); 562 563 mempool_destroy(fsc->wb_pagevec_pool); 564 565 destroy_mount_options(fsc->mount_options); 566 567 ceph_fs_debugfs_cleanup(fsc); 568 569 ceph_destroy_client(fsc->client); 570 571 kfree(fsc); 572 dout("destroy_fs_client %p done\n", fsc); 573 } 574 575 /* 576 * caches 577 */ 578 struct kmem_cache *ceph_inode_cachep; 579 struct kmem_cache *ceph_cap_cachep; 580 struct kmem_cache *ceph_dentry_cachep; 581 struct kmem_cache *ceph_file_cachep; 582 583 static void ceph_inode_init_once(void *foo) 584 { 585 struct ceph_inode_info *ci = foo; 586 inode_init_once(&ci->vfs_inode); 587 } 588 589 static int __init init_caches(void) 590 { 591 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 592 sizeof(struct ceph_inode_info), 593 __alignof__(struct ceph_inode_info), 594 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 595 ceph_inode_init_once); 596 if (ceph_inode_cachep == NULL) 597 return -ENOMEM; 598 599 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 600 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 601 if (ceph_cap_cachep == NULL) 602 goto bad_cap; 603 604 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 605 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 606 if (ceph_dentry_cachep == NULL) 607 goto bad_dentry; 608 609 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 610 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 611 if (ceph_file_cachep == NULL) 612 goto bad_file; 613 614 return 0; 615 616 bad_file: 617 kmem_cache_destroy(ceph_dentry_cachep); 618 bad_dentry: 619 kmem_cache_destroy(ceph_cap_cachep); 620 bad_cap: 621 kmem_cache_destroy(ceph_inode_cachep); 622 return -ENOMEM; 623 } 624 625 static void destroy_caches(void) 626 { 627 /* 628 * Make sure all delayed rcu free inodes are flushed before we 629 * destroy cache. 630 */ 631 rcu_barrier(); 632 kmem_cache_destroy(ceph_inode_cachep); 633 kmem_cache_destroy(ceph_cap_cachep); 634 kmem_cache_destroy(ceph_dentry_cachep); 635 kmem_cache_destroy(ceph_file_cachep); 636 } 637 638 639 /* 640 * ceph_umount_begin - initiate forced umount. Tear down down the 641 * mount, skipping steps that may hang while waiting for server(s). 642 */ 643 static void ceph_umount_begin(struct super_block *sb) 644 { 645 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 646 647 dout("ceph_umount_begin - starting forced umount\n"); 648 if (!fsc) 649 return; 650 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 651 return; 652 } 653 654 static const struct super_operations ceph_super_ops = { 655 .alloc_inode = ceph_alloc_inode, 656 .destroy_inode = ceph_destroy_inode, 657 .write_inode = ceph_write_inode, 658 .sync_fs = ceph_sync_fs, 659 .put_super = ceph_put_super, 660 .show_options = ceph_show_options, 661 .statfs = ceph_statfs, 662 .umount_begin = ceph_umount_begin, 663 }; 664 665 /* 666 * Bootstrap mount by opening the root directory. Note the mount 667 * @started time from caller, and time out if this takes too long. 668 */ 669 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 670 const char *path, 671 unsigned long started) 672 { 673 struct ceph_mds_client *mdsc = fsc->mdsc; 674 struct ceph_mds_request *req = NULL; 675 int err; 676 struct dentry *root; 677 678 /* open dir */ 679 dout("open_root_inode opening '%s'\n", path); 680 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 681 if (IS_ERR(req)) 682 return ERR_CAST(req); 683 req->r_path1 = kstrdup(path, GFP_NOFS); 684 req->r_ino1.ino = CEPH_INO_ROOT; 685 req->r_ino1.snap = CEPH_NOSNAP; 686 req->r_started = started; 687 req->r_timeout = fsc->client->options->mount_timeout * HZ; 688 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 689 req->r_num_caps = 2; 690 err = ceph_mdsc_do_request(mdsc, NULL, req); 691 if (err == 0) { 692 struct inode *inode = req->r_target_inode; 693 req->r_target_inode = NULL; 694 dout("open_root_inode success\n"); 695 if (ceph_ino(inode) == CEPH_INO_ROOT && 696 fsc->sb->s_root == NULL) { 697 root = d_make_root(inode); 698 if (!root) { 699 root = ERR_PTR(-ENOMEM); 700 goto out; 701 } 702 } else { 703 root = d_obtain_alias(inode); 704 } 705 ceph_init_dentry(root); 706 dout("open_root_inode success, root dentry is %p\n", root); 707 } else { 708 root = ERR_PTR(err); 709 } 710 out: 711 ceph_mdsc_put_request(req); 712 return root; 713 } 714 715 716 717 718 /* 719 * mount: join the ceph cluster, and open root directory. 720 */ 721 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 722 const char *path) 723 { 724 int err; 725 unsigned long started = jiffies; /* note the start time */ 726 struct dentry *root; 727 int first = 0; /* first vfsmount for this super_block */ 728 729 dout("mount start\n"); 730 mutex_lock(&fsc->client->mount_mutex); 731 732 err = __ceph_open_session(fsc->client, started); 733 if (err < 0) 734 goto out; 735 736 dout("mount opening root\n"); 737 root = open_root_dentry(fsc, "", started); 738 if (IS_ERR(root)) { 739 err = PTR_ERR(root); 740 goto out; 741 } 742 if (fsc->sb->s_root) { 743 dput(root); 744 } else { 745 fsc->sb->s_root = root; 746 first = 1; 747 748 err = ceph_fs_debugfs_init(fsc); 749 if (err < 0) 750 goto fail; 751 } 752 753 if (path[0] == 0) { 754 dget(root); 755 } else { 756 dout("mount opening base mountpoint\n"); 757 root = open_root_dentry(fsc, path, started); 758 if (IS_ERR(root)) { 759 err = PTR_ERR(root); 760 goto fail; 761 } 762 } 763 764 fsc->mount_state = CEPH_MOUNT_MOUNTED; 765 dout("mount success\n"); 766 mutex_unlock(&fsc->client->mount_mutex); 767 return root; 768 769 out: 770 mutex_unlock(&fsc->client->mount_mutex); 771 return ERR_PTR(err); 772 773 fail: 774 if (first) { 775 dput(fsc->sb->s_root); 776 fsc->sb->s_root = NULL; 777 } 778 goto out; 779 } 780 781 static int ceph_set_super(struct super_block *s, void *data) 782 { 783 struct ceph_fs_client *fsc = data; 784 int ret; 785 786 dout("set_super %p data %p\n", s, data); 787 788 s->s_flags = fsc->mount_options->sb_flags; 789 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 790 791 s->s_fs_info = fsc; 792 fsc->sb = s; 793 794 s->s_op = &ceph_super_ops; 795 s->s_export_op = &ceph_export_ops; 796 797 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 798 799 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 800 if (ret != 0) 801 goto fail; 802 803 return ret; 804 805 fail: 806 s->s_fs_info = NULL; 807 fsc->sb = NULL; 808 return ret; 809 } 810 811 /* 812 * share superblock if same fs AND options 813 */ 814 static int ceph_compare_super(struct super_block *sb, void *data) 815 { 816 struct ceph_fs_client *new = data; 817 struct ceph_mount_options *fsopt = new->mount_options; 818 struct ceph_options *opt = new->client->options; 819 struct ceph_fs_client *other = ceph_sb_to_client(sb); 820 821 dout("ceph_compare_super %p\n", sb); 822 823 if (compare_mount_options(fsopt, opt, other)) { 824 dout("monitor(s)/mount options don't match\n"); 825 return 0; 826 } 827 if ((opt->flags & CEPH_OPT_FSID) && 828 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 829 dout("fsid doesn't match\n"); 830 return 0; 831 } 832 if (fsopt->sb_flags != other->mount_options->sb_flags) { 833 dout("flags differ\n"); 834 return 0; 835 } 836 return 1; 837 } 838 839 /* 840 * construct our own bdi so we can control readahead, etc. 841 */ 842 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 843 844 static int ceph_register_bdi(struct super_block *sb, 845 struct ceph_fs_client *fsc) 846 { 847 int err; 848 849 /* set ra_pages based on rasize mount option? */ 850 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 851 fsc->backing_dev_info.ra_pages = 852 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 853 >> PAGE_SHIFT; 854 else 855 fsc->backing_dev_info.ra_pages = 856 default_backing_dev_info.ra_pages; 857 858 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 859 atomic_long_inc_return(&bdi_seq)); 860 if (!err) 861 sb->s_bdi = &fsc->backing_dev_info; 862 return err; 863 } 864 865 static struct dentry *ceph_mount(struct file_system_type *fs_type, 866 int flags, const char *dev_name, void *data) 867 { 868 struct super_block *sb; 869 struct ceph_fs_client *fsc; 870 struct dentry *res; 871 int err; 872 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 873 const char *path = NULL; 874 struct ceph_mount_options *fsopt = NULL; 875 struct ceph_options *opt = NULL; 876 877 dout("ceph_mount\n"); 878 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 879 if (err < 0) { 880 res = ERR_PTR(err); 881 goto out_final; 882 } 883 884 /* create client (which we may/may not use) */ 885 fsc = create_fs_client(fsopt, opt); 886 if (IS_ERR(fsc)) { 887 res = ERR_CAST(fsc); 888 destroy_mount_options(fsopt); 889 ceph_destroy_options(opt); 890 goto out_final; 891 } 892 893 err = ceph_mdsc_init(fsc); 894 if (err < 0) { 895 res = ERR_PTR(err); 896 goto out; 897 } 898 899 if (ceph_test_opt(fsc->client, NOSHARE)) 900 compare_super = NULL; 901 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 902 if (IS_ERR(sb)) { 903 res = ERR_CAST(sb); 904 goto out; 905 } 906 907 if (ceph_sb_to_client(sb) != fsc) { 908 ceph_mdsc_destroy(fsc); 909 destroy_fs_client(fsc); 910 fsc = ceph_sb_to_client(sb); 911 dout("get_sb got existing client %p\n", fsc); 912 } else { 913 dout("get_sb using new client %p\n", fsc); 914 err = ceph_register_bdi(sb, fsc); 915 if (err < 0) { 916 res = ERR_PTR(err); 917 goto out_splat; 918 } 919 } 920 921 res = ceph_real_mount(fsc, path); 922 if (IS_ERR(res)) 923 goto out_splat; 924 dout("root %p inode %p ino %llx.%llx\n", res, 925 res->d_inode, ceph_vinop(res->d_inode)); 926 return res; 927 928 out_splat: 929 ceph_mdsc_close_sessions(fsc->mdsc); 930 deactivate_locked_super(sb); 931 goto out_final; 932 933 out: 934 ceph_mdsc_destroy(fsc); 935 destroy_fs_client(fsc); 936 out_final: 937 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 938 return res; 939 } 940 941 static void ceph_kill_sb(struct super_block *s) 942 { 943 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 944 dout("kill_sb %p\n", s); 945 ceph_mdsc_pre_umount(fsc->mdsc); 946 kill_anon_super(s); /* will call put_super after sb is r/o */ 947 ceph_mdsc_destroy(fsc); 948 destroy_fs_client(fsc); 949 } 950 951 static struct file_system_type ceph_fs_type = { 952 .owner = THIS_MODULE, 953 .name = "ceph", 954 .mount = ceph_mount, 955 .kill_sb = ceph_kill_sb, 956 .fs_flags = FS_RENAME_DOES_D_MOVE, 957 }; 958 MODULE_ALIAS_FS("ceph"); 959 960 #define _STRINGIFY(x) #x 961 #define STRINGIFY(x) _STRINGIFY(x) 962 963 static int __init init_ceph(void) 964 { 965 int ret = init_caches(); 966 if (ret) 967 goto out; 968 969 ceph_xattr_init(); 970 ret = register_filesystem(&ceph_fs_type); 971 if (ret) 972 goto out_icache; 973 974 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 975 976 return 0; 977 978 out_icache: 979 ceph_xattr_exit(); 980 destroy_caches(); 981 out: 982 return ret; 983 } 984 985 static void __exit exit_ceph(void) 986 { 987 dout("exit_ceph\n"); 988 unregister_filesystem(&ceph_fs_type); 989 ceph_xattr_exit(); 990 destroy_caches(); 991 } 992 993 module_init(init_ceph); 994 module_exit(exit_ceph); 995 996 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 997 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 998 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 999 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1000 MODULE_LICENSE("GPL"); 1001