1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/ctype.h> 6 #include <linux/fs.h> 7 #include <linux/inet.h> 8 #include <linux/in6.h> 9 #include <linux/module.h> 10 #include <linux/mount.h> 11 #include <linux/parser.h> 12 #include <linux/sched.h> 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <linux/statfs.h> 16 #include <linux/string.h> 17 18 #include "super.h" 19 #include "mds_client.h" 20 #include "cache.h" 21 22 #include <linux/ceph/ceph_features.h> 23 #include <linux/ceph/decode.h> 24 #include <linux/ceph/mon_client.h> 25 #include <linux/ceph/auth.h> 26 #include <linux/ceph/debugfs.h> 27 28 /* 29 * Ceph superblock operations 30 * 31 * Handle the basics of mounting, unmounting. 32 */ 33 34 /* 35 * super ops 36 */ 37 static void ceph_put_super(struct super_block *s) 38 { 39 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 40 41 dout("put_super\n"); 42 ceph_mdsc_close_sessions(fsc->mdsc); 43 } 44 45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 46 { 47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); 48 struct ceph_monmap *monmap = fsc->client->monc.monmap; 49 struct ceph_statfs st; 50 u64 fsid; 51 int err; 52 53 dout("statfs\n"); 54 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 55 if (err < 0) 56 return err; 57 58 /* fill in kstatfs */ 59 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 60 61 /* 62 * express utilization in terms of large blocks to avoid 63 * overflow on 32-bit machines. 64 * 65 * NOTE: for the time being, we make bsize == frsize to humor 66 * not-yet-ancient versions of glibc that are broken. 67 * Someday, we will probably want to report a real block 68 * size... whatever that may mean for a network file system! 69 */ 70 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 71 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 72 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 73 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 74 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 75 76 buf->f_files = le64_to_cpu(st.num_objects); 77 buf->f_ffree = -1; 78 buf->f_namelen = NAME_MAX; 79 80 /* leave fsid little-endian, regardless of host endianness */ 81 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 82 buf->f_fsid.val[0] = fsid & 0xffffffff; 83 buf->f_fsid.val[1] = fsid >> 32; 84 85 return 0; 86 } 87 88 89 static int ceph_sync_fs(struct super_block *sb, int wait) 90 { 91 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 92 93 if (!wait) { 94 dout("sync_fs (non-blocking)\n"); 95 ceph_flush_dirty_caps(fsc->mdsc); 96 dout("sync_fs (non-blocking) done\n"); 97 return 0; 98 } 99 100 dout("sync_fs (blocking)\n"); 101 ceph_osdc_sync(&fsc->client->osdc); 102 ceph_mdsc_sync(fsc->mdsc); 103 dout("sync_fs (blocking) done\n"); 104 return 0; 105 } 106 107 /* 108 * mount options 109 */ 110 enum { 111 Opt_wsize, 112 Opt_rsize, 113 Opt_rasize, 114 Opt_caps_wanted_delay_min, 115 Opt_caps_wanted_delay_max, 116 Opt_cap_release_safety, 117 Opt_readdir_max_entries, 118 Opt_readdir_max_bytes, 119 Opt_congestion_kb, 120 Opt_last_int, 121 /* int args above */ 122 Opt_snapdirname, 123 Opt_last_string, 124 /* string args above */ 125 Opt_dirstat, 126 Opt_nodirstat, 127 Opt_rbytes, 128 Opt_norbytes, 129 Opt_asyncreaddir, 130 Opt_noasyncreaddir, 131 Opt_dcache, 132 Opt_nodcache, 133 Opt_ino32, 134 Opt_noino32, 135 Opt_fscache, 136 Opt_nofscache, 137 Opt_poolperm, 138 Opt_nopoolperm, 139 #ifdef CONFIG_CEPH_FS_POSIX_ACL 140 Opt_acl, 141 #endif 142 Opt_noacl, 143 }; 144 145 static match_table_t fsopt_tokens = { 146 {Opt_wsize, "wsize=%d"}, 147 {Opt_rsize, "rsize=%d"}, 148 {Opt_rasize, "rasize=%d"}, 149 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 150 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 151 {Opt_cap_release_safety, "cap_release_safety=%d"}, 152 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 153 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 154 {Opt_congestion_kb, "write_congestion_kb=%d"}, 155 /* int args above */ 156 {Opt_snapdirname, "snapdirname=%s"}, 157 /* string args above */ 158 {Opt_dirstat, "dirstat"}, 159 {Opt_nodirstat, "nodirstat"}, 160 {Opt_rbytes, "rbytes"}, 161 {Opt_norbytes, "norbytes"}, 162 {Opt_asyncreaddir, "asyncreaddir"}, 163 {Opt_noasyncreaddir, "noasyncreaddir"}, 164 {Opt_dcache, "dcache"}, 165 {Opt_nodcache, "nodcache"}, 166 {Opt_ino32, "ino32"}, 167 {Opt_noino32, "noino32"}, 168 {Opt_fscache, "fsc"}, 169 {Opt_nofscache, "nofsc"}, 170 {Opt_poolperm, "poolperm"}, 171 {Opt_nopoolperm, "nopoolperm"}, 172 #ifdef CONFIG_CEPH_FS_POSIX_ACL 173 {Opt_acl, "acl"}, 174 #endif 175 {Opt_noacl, "noacl"}, 176 {-1, NULL} 177 }; 178 179 static int parse_fsopt_token(char *c, void *private) 180 { 181 struct ceph_mount_options *fsopt = private; 182 substring_t argstr[MAX_OPT_ARGS]; 183 int token, intval, ret; 184 185 token = match_token((char *)c, fsopt_tokens, argstr); 186 if (token < 0) 187 return -EINVAL; 188 189 if (token < Opt_last_int) { 190 ret = match_int(&argstr[0], &intval); 191 if (ret < 0) { 192 pr_err("bad mount option arg (not int) " 193 "at '%s'\n", c); 194 return ret; 195 } 196 dout("got int token %d val %d\n", token, intval); 197 } else if (token > Opt_last_int && token < Opt_last_string) { 198 dout("got string token %d val %s\n", token, 199 argstr[0].from); 200 } else { 201 dout("got token %d\n", token); 202 } 203 204 switch (token) { 205 case Opt_snapdirname: 206 kfree(fsopt->snapdir_name); 207 fsopt->snapdir_name = kstrndup(argstr[0].from, 208 argstr[0].to-argstr[0].from, 209 GFP_KERNEL); 210 if (!fsopt->snapdir_name) 211 return -ENOMEM; 212 break; 213 214 /* misc */ 215 case Opt_wsize: 216 fsopt->wsize = intval; 217 break; 218 case Opt_rsize: 219 fsopt->rsize = intval; 220 break; 221 case Opt_rasize: 222 fsopt->rasize = intval; 223 break; 224 case Opt_caps_wanted_delay_min: 225 fsopt->caps_wanted_delay_min = intval; 226 break; 227 case Opt_caps_wanted_delay_max: 228 fsopt->caps_wanted_delay_max = intval; 229 break; 230 case Opt_readdir_max_entries: 231 fsopt->max_readdir = intval; 232 break; 233 case Opt_readdir_max_bytes: 234 fsopt->max_readdir_bytes = intval; 235 break; 236 case Opt_congestion_kb: 237 fsopt->congestion_kb = intval; 238 break; 239 case Opt_dirstat: 240 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 241 break; 242 case Opt_nodirstat: 243 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 244 break; 245 case Opt_rbytes: 246 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 247 break; 248 case Opt_norbytes: 249 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 250 break; 251 case Opt_asyncreaddir: 252 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 253 break; 254 case Opt_noasyncreaddir: 255 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 256 break; 257 case Opt_dcache: 258 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 259 break; 260 case Opt_nodcache: 261 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 262 break; 263 case Opt_ino32: 264 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 265 break; 266 case Opt_noino32: 267 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 268 break; 269 case Opt_fscache: 270 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 271 break; 272 case Opt_nofscache: 273 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 274 break; 275 case Opt_poolperm: 276 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 277 printk ("pool perm"); 278 break; 279 case Opt_nopoolperm: 280 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 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 if (!fsopt->snapdir_name) { 360 err = -ENOMEM; 361 goto out; 362 } 363 364 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 365 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 366 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 367 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 368 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 369 fsopt->congestion_kb = default_congestion_kb(); 370 371 /* 372 * Distinguish the server list from the path in "dev_name". 373 * Internally we do not include the leading '/' in the path. 374 * 375 * "dev_name" will look like: 376 * <server_spec>[,<server_spec>...]:[<path>] 377 * where 378 * <server_spec> is <ip>[:<port>] 379 * <path> is optional, but if present must begin with '/' 380 */ 381 dev_name_end = strchr(dev_name, '/'); 382 if (dev_name_end) { 383 /* skip over leading '/' for path */ 384 *path = dev_name_end + 1; 385 } else { 386 /* path is empty */ 387 dev_name_end = dev_name + strlen(dev_name); 388 *path = dev_name_end; 389 } 390 err = -EINVAL; 391 dev_name_end--; /* back up to ':' separator */ 392 if (dev_name_end < dev_name || *dev_name_end != ':') { 393 pr_err("device name is missing path (no : separator in %s)\n", 394 dev_name); 395 goto out; 396 } 397 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 398 dout("server path '%s'\n", *path); 399 400 *popt = ceph_parse_options(options, dev_name, dev_name_end, 401 parse_fsopt_token, (void *)fsopt); 402 if (IS_ERR(*popt)) { 403 err = PTR_ERR(*popt); 404 goto out; 405 } 406 407 /* success */ 408 *pfsopt = fsopt; 409 return 0; 410 411 out: 412 destroy_mount_options(fsopt); 413 return err; 414 } 415 416 /** 417 * ceph_show_options - Show mount options in /proc/mounts 418 * @m: seq_file to write to 419 * @root: root of that (sub)tree 420 */ 421 static int ceph_show_options(struct seq_file *m, struct dentry *root) 422 { 423 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 424 struct ceph_mount_options *fsopt = fsc->mount_options; 425 size_t pos; 426 int ret; 427 428 /* a comma between MNT/MS and client options */ 429 seq_putc(m, ','); 430 pos = m->count; 431 432 ret = ceph_print_client_options(m, fsc->client); 433 if (ret) 434 return ret; 435 436 /* retract our comma if no client options */ 437 if (m->count == pos) 438 m->count--; 439 440 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 441 seq_puts(m, ",dirstat"); 442 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 443 seq_puts(m, ",norbytes"); 444 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 445 seq_puts(m, ",noasyncreaddir"); 446 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 447 seq_puts(m, ",nodcache"); 448 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 449 seq_puts(m, ",fsc"); 450 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 451 seq_puts(m, ",nopoolperm"); 452 453 #ifdef CONFIG_CEPH_FS_POSIX_ACL 454 if (fsopt->sb_flags & MS_POSIXACL) 455 seq_puts(m, ",acl"); 456 else 457 seq_puts(m, ",noacl"); 458 #endif 459 460 if (fsopt->wsize) 461 seq_printf(m, ",wsize=%d", fsopt->wsize); 462 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 463 seq_printf(m, ",rsize=%d", fsopt->rsize); 464 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 465 seq_printf(m, ",rasize=%d", fsopt->rasize); 466 if (fsopt->congestion_kb != default_congestion_kb()) 467 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 468 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 469 seq_printf(m, ",caps_wanted_delay_min=%d", 470 fsopt->caps_wanted_delay_min); 471 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 472 seq_printf(m, ",caps_wanted_delay_max=%d", 473 fsopt->caps_wanted_delay_max); 474 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 475 seq_printf(m, ",cap_release_safety=%d", 476 fsopt->cap_release_safety); 477 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 478 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 479 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 480 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 481 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 482 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 483 484 return 0; 485 } 486 487 /* 488 * handle any mon messages the standard library doesn't understand. 489 * return error if we don't either. 490 */ 491 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 492 { 493 struct ceph_fs_client *fsc = client->private; 494 int type = le16_to_cpu(msg->hdr.type); 495 496 switch (type) { 497 case CEPH_MSG_MDS_MAP: 498 ceph_mdsc_handle_map(fsc->mdsc, msg); 499 return 0; 500 501 default: 502 return -1; 503 } 504 } 505 506 /* 507 * create a new fs client 508 */ 509 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 510 struct ceph_options *opt) 511 { 512 struct ceph_fs_client *fsc; 513 const u64 supported_features = 514 CEPH_FEATURE_FLOCK | 515 CEPH_FEATURE_DIRLAYOUTHASH | 516 CEPH_FEATURE_MDS_INLINE_DATA; 517 const u64 required_features = 0; 518 int page_count; 519 size_t size; 520 int err = -ENOMEM; 521 522 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 523 if (!fsc) 524 return ERR_PTR(-ENOMEM); 525 526 fsc->client = ceph_create_client(opt, fsc, supported_features, 527 required_features); 528 if (IS_ERR(fsc->client)) { 529 err = PTR_ERR(fsc->client); 530 goto fail; 531 } 532 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 533 fsc->client->monc.want_mdsmap = 1; 534 535 fsc->mount_options = fsopt; 536 537 fsc->sb = NULL; 538 fsc->mount_state = CEPH_MOUNT_MOUNTING; 539 540 atomic_long_set(&fsc->writeback_count, 0); 541 542 err = bdi_init(&fsc->backing_dev_info); 543 if (err < 0) 544 goto fail_client; 545 546 err = -ENOMEM; 547 /* 548 * The number of concurrent works can be high but they don't need 549 * to be processed in parallel, limit concurrency. 550 */ 551 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 552 if (fsc->wb_wq == NULL) 553 goto fail_bdi; 554 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 555 if (fsc->pg_inv_wq == NULL) 556 goto fail_wb_wq; 557 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 558 if (fsc->trunc_wq == NULL) 559 goto fail_pg_inv_wq; 560 561 /* set up mempools */ 562 err = -ENOMEM; 563 page_count = fsc->mount_options->wsize >> PAGE_CACHE_SHIFT; 564 size = sizeof (struct page *) * (page_count ? page_count : 1); 565 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 566 if (!fsc->wb_pagevec_pool) 567 goto fail_trunc_wq; 568 569 /* setup fscache */ 570 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 571 (ceph_fscache_register_fs(fsc) != 0)) 572 goto fail_fscache; 573 574 /* caps */ 575 fsc->min_caps = fsopt->max_readdir; 576 577 return fsc; 578 579 fail_fscache: 580 ceph_fscache_unregister_fs(fsc); 581 fail_trunc_wq: 582 destroy_workqueue(fsc->trunc_wq); 583 fail_pg_inv_wq: 584 destroy_workqueue(fsc->pg_inv_wq); 585 fail_wb_wq: 586 destroy_workqueue(fsc->wb_wq); 587 fail_bdi: 588 bdi_destroy(&fsc->backing_dev_info); 589 fail_client: 590 ceph_destroy_client(fsc->client); 591 fail: 592 kfree(fsc); 593 return ERR_PTR(err); 594 } 595 596 static void destroy_fs_client(struct ceph_fs_client *fsc) 597 { 598 dout("destroy_fs_client %p\n", fsc); 599 600 ceph_fscache_unregister_fs(fsc); 601 602 destroy_workqueue(fsc->wb_wq); 603 destroy_workqueue(fsc->pg_inv_wq); 604 destroy_workqueue(fsc->trunc_wq); 605 606 bdi_destroy(&fsc->backing_dev_info); 607 608 mempool_destroy(fsc->wb_pagevec_pool); 609 610 destroy_mount_options(fsc->mount_options); 611 612 ceph_fs_debugfs_cleanup(fsc); 613 614 ceph_destroy_client(fsc->client); 615 616 kfree(fsc); 617 dout("destroy_fs_client %p done\n", fsc); 618 } 619 620 /* 621 * caches 622 */ 623 struct kmem_cache *ceph_inode_cachep; 624 struct kmem_cache *ceph_cap_cachep; 625 struct kmem_cache *ceph_cap_flush_cachep; 626 struct kmem_cache *ceph_dentry_cachep; 627 struct kmem_cache *ceph_file_cachep; 628 629 static void ceph_inode_init_once(void *foo) 630 { 631 struct ceph_inode_info *ci = foo; 632 inode_init_once(&ci->vfs_inode); 633 } 634 635 static int __init init_caches(void) 636 { 637 int error = -ENOMEM; 638 639 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 640 sizeof(struct ceph_inode_info), 641 __alignof__(struct ceph_inode_info), 642 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 643 SLAB_ACCOUNT, ceph_inode_init_once); 644 if (ceph_inode_cachep == NULL) 645 return -ENOMEM; 646 647 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 648 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 649 if (ceph_cap_cachep == NULL) 650 goto bad_cap; 651 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 652 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 653 if (ceph_cap_flush_cachep == NULL) 654 goto bad_cap_flush; 655 656 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 657 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 658 if (ceph_dentry_cachep == NULL) 659 goto bad_dentry; 660 661 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 662 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 663 if (ceph_file_cachep == NULL) 664 goto bad_file; 665 666 if ((error = ceph_fscache_register())) 667 goto bad_file; 668 669 return 0; 670 bad_file: 671 kmem_cache_destroy(ceph_dentry_cachep); 672 bad_dentry: 673 kmem_cache_destroy(ceph_cap_flush_cachep); 674 bad_cap_flush: 675 kmem_cache_destroy(ceph_cap_cachep); 676 bad_cap: 677 kmem_cache_destroy(ceph_inode_cachep); 678 return error; 679 } 680 681 static void destroy_caches(void) 682 { 683 /* 684 * Make sure all delayed rcu free inodes are flushed before we 685 * destroy cache. 686 */ 687 rcu_barrier(); 688 689 kmem_cache_destroy(ceph_inode_cachep); 690 kmem_cache_destroy(ceph_cap_cachep); 691 kmem_cache_destroy(ceph_cap_flush_cachep); 692 kmem_cache_destroy(ceph_dentry_cachep); 693 kmem_cache_destroy(ceph_file_cachep); 694 695 ceph_fscache_unregister(); 696 } 697 698 699 /* 700 * ceph_umount_begin - initiate forced umount. Tear down down the 701 * mount, skipping steps that may hang while waiting for server(s). 702 */ 703 static void ceph_umount_begin(struct super_block *sb) 704 { 705 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 706 707 dout("ceph_umount_begin - starting forced umount\n"); 708 if (!fsc) 709 return; 710 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 711 ceph_mdsc_force_umount(fsc->mdsc); 712 return; 713 } 714 715 static const struct super_operations ceph_super_ops = { 716 .alloc_inode = ceph_alloc_inode, 717 .destroy_inode = ceph_destroy_inode, 718 .write_inode = ceph_write_inode, 719 .drop_inode = ceph_drop_inode, 720 .sync_fs = ceph_sync_fs, 721 .put_super = ceph_put_super, 722 .show_options = ceph_show_options, 723 .statfs = ceph_statfs, 724 .umount_begin = ceph_umount_begin, 725 }; 726 727 /* 728 * Bootstrap mount by opening the root directory. Note the mount 729 * @started time from caller, and time out if this takes too long. 730 */ 731 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 732 const char *path, 733 unsigned long started) 734 { 735 struct ceph_mds_client *mdsc = fsc->mdsc; 736 struct ceph_mds_request *req = NULL; 737 int err; 738 struct dentry *root; 739 740 /* open dir */ 741 dout("open_root_inode opening '%s'\n", path); 742 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 743 if (IS_ERR(req)) 744 return ERR_CAST(req); 745 req->r_path1 = kstrdup(path, GFP_NOFS); 746 if (!req->r_path1) { 747 root = ERR_PTR(-ENOMEM); 748 goto out; 749 } 750 751 req->r_ino1.ino = CEPH_INO_ROOT; 752 req->r_ino1.snap = CEPH_NOSNAP; 753 req->r_started = started; 754 req->r_timeout = fsc->client->options->mount_timeout; 755 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 756 req->r_num_caps = 2; 757 err = ceph_mdsc_do_request(mdsc, NULL, req); 758 if (err == 0) { 759 struct inode *inode = req->r_target_inode; 760 req->r_target_inode = NULL; 761 dout("open_root_inode success\n"); 762 if (ceph_ino(inode) == CEPH_INO_ROOT && 763 fsc->sb->s_root == NULL) { 764 root = d_make_root(inode); 765 if (!root) { 766 root = ERR_PTR(-ENOMEM); 767 goto out; 768 } 769 } else { 770 root = d_obtain_root(inode); 771 } 772 ceph_init_dentry(root); 773 dout("open_root_inode success, root dentry is %p\n", root); 774 } else { 775 root = ERR_PTR(err); 776 } 777 out: 778 ceph_mdsc_put_request(req); 779 return root; 780 } 781 782 783 784 785 /* 786 * mount: join the ceph cluster, and open root directory. 787 */ 788 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 789 const char *path) 790 { 791 int err; 792 unsigned long started = jiffies; /* note the start time */ 793 struct dentry *root; 794 int first = 0; /* first vfsmount for this super_block */ 795 796 dout("mount start\n"); 797 mutex_lock(&fsc->client->mount_mutex); 798 799 err = __ceph_open_session(fsc->client, started); 800 if (err < 0) 801 goto out; 802 803 dout("mount opening root\n"); 804 root = open_root_dentry(fsc, "", started); 805 if (IS_ERR(root)) { 806 err = PTR_ERR(root); 807 goto out; 808 } 809 if (fsc->sb->s_root) { 810 dput(root); 811 } else { 812 fsc->sb->s_root = root; 813 first = 1; 814 815 err = ceph_fs_debugfs_init(fsc); 816 if (err < 0) 817 goto fail; 818 } 819 820 if (path[0] == 0) { 821 dget(root); 822 } else { 823 dout("mount opening base mountpoint\n"); 824 root = open_root_dentry(fsc, path, started); 825 if (IS_ERR(root)) { 826 err = PTR_ERR(root); 827 goto fail; 828 } 829 } 830 831 fsc->mount_state = CEPH_MOUNT_MOUNTED; 832 dout("mount success\n"); 833 mutex_unlock(&fsc->client->mount_mutex); 834 return root; 835 836 out: 837 mutex_unlock(&fsc->client->mount_mutex); 838 return ERR_PTR(err); 839 840 fail: 841 if (first) { 842 dput(fsc->sb->s_root); 843 fsc->sb->s_root = NULL; 844 } 845 goto out; 846 } 847 848 static int ceph_set_super(struct super_block *s, void *data) 849 { 850 struct ceph_fs_client *fsc = data; 851 int ret; 852 853 dout("set_super %p data %p\n", s, data); 854 855 s->s_flags = fsc->mount_options->sb_flags; 856 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 857 858 s->s_xattr = ceph_xattr_handlers; 859 s->s_fs_info = fsc; 860 fsc->sb = s; 861 862 s->s_op = &ceph_super_ops; 863 s->s_export_op = &ceph_export_ops; 864 865 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 866 867 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 868 if (ret != 0) 869 goto fail; 870 871 return ret; 872 873 fail: 874 s->s_fs_info = NULL; 875 fsc->sb = NULL; 876 return ret; 877 } 878 879 /* 880 * share superblock if same fs AND options 881 */ 882 static int ceph_compare_super(struct super_block *sb, void *data) 883 { 884 struct ceph_fs_client *new = data; 885 struct ceph_mount_options *fsopt = new->mount_options; 886 struct ceph_options *opt = new->client->options; 887 struct ceph_fs_client *other = ceph_sb_to_client(sb); 888 889 dout("ceph_compare_super %p\n", sb); 890 891 if (compare_mount_options(fsopt, opt, other)) { 892 dout("monitor(s)/mount options don't match\n"); 893 return 0; 894 } 895 if ((opt->flags & CEPH_OPT_FSID) && 896 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 897 dout("fsid doesn't match\n"); 898 return 0; 899 } 900 if (fsopt->sb_flags != other->mount_options->sb_flags) { 901 dout("flags differ\n"); 902 return 0; 903 } 904 return 1; 905 } 906 907 /* 908 * construct our own bdi so we can control readahead, etc. 909 */ 910 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 911 912 static int ceph_register_bdi(struct super_block *sb, 913 struct ceph_fs_client *fsc) 914 { 915 int err; 916 917 /* set ra_pages based on rasize mount option? */ 918 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 919 fsc->backing_dev_info.ra_pages = 920 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 921 >> PAGE_SHIFT; 922 else 923 fsc->backing_dev_info.ra_pages = 924 VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE; 925 926 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 927 atomic_long_inc_return(&bdi_seq)); 928 if (!err) 929 sb->s_bdi = &fsc->backing_dev_info; 930 return err; 931 } 932 933 static struct dentry *ceph_mount(struct file_system_type *fs_type, 934 int flags, const char *dev_name, void *data) 935 { 936 struct super_block *sb; 937 struct ceph_fs_client *fsc; 938 struct dentry *res; 939 int err; 940 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 941 const char *path = NULL; 942 struct ceph_mount_options *fsopt = NULL; 943 struct ceph_options *opt = NULL; 944 945 dout("ceph_mount\n"); 946 947 #ifdef CONFIG_CEPH_FS_POSIX_ACL 948 flags |= MS_POSIXACL; 949 #endif 950 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 951 if (err < 0) { 952 res = ERR_PTR(err); 953 goto out_final; 954 } 955 956 /* create client (which we may/may not use) */ 957 fsc = create_fs_client(fsopt, opt); 958 if (IS_ERR(fsc)) { 959 res = ERR_CAST(fsc); 960 destroy_mount_options(fsopt); 961 ceph_destroy_options(opt); 962 goto out_final; 963 } 964 965 err = ceph_mdsc_init(fsc); 966 if (err < 0) { 967 res = ERR_PTR(err); 968 goto out; 969 } 970 971 if (ceph_test_opt(fsc->client, NOSHARE)) 972 compare_super = NULL; 973 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 974 if (IS_ERR(sb)) { 975 res = ERR_CAST(sb); 976 goto out; 977 } 978 979 if (ceph_sb_to_client(sb) != fsc) { 980 ceph_mdsc_destroy(fsc); 981 destroy_fs_client(fsc); 982 fsc = ceph_sb_to_client(sb); 983 dout("get_sb got existing client %p\n", fsc); 984 } else { 985 dout("get_sb using new client %p\n", fsc); 986 err = ceph_register_bdi(sb, fsc); 987 if (err < 0) { 988 res = ERR_PTR(err); 989 goto out_splat; 990 } 991 } 992 993 res = ceph_real_mount(fsc, path); 994 if (IS_ERR(res)) 995 goto out_splat; 996 dout("root %p inode %p ino %llx.%llx\n", res, 997 d_inode(res), ceph_vinop(d_inode(res))); 998 return res; 999 1000 out_splat: 1001 ceph_mdsc_close_sessions(fsc->mdsc); 1002 deactivate_locked_super(sb); 1003 goto out_final; 1004 1005 out: 1006 ceph_mdsc_destroy(fsc); 1007 destroy_fs_client(fsc); 1008 out_final: 1009 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1010 return res; 1011 } 1012 1013 static void ceph_kill_sb(struct super_block *s) 1014 { 1015 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1016 dev_t dev = s->s_dev; 1017 1018 dout("kill_sb %p\n", s); 1019 1020 ceph_mdsc_pre_umount(fsc->mdsc); 1021 generic_shutdown_super(s); 1022 ceph_mdsc_destroy(fsc); 1023 1024 destroy_fs_client(fsc); 1025 free_anon_bdev(dev); 1026 } 1027 1028 static struct file_system_type ceph_fs_type = { 1029 .owner = THIS_MODULE, 1030 .name = "ceph", 1031 .mount = ceph_mount, 1032 .kill_sb = ceph_kill_sb, 1033 .fs_flags = FS_RENAME_DOES_D_MOVE, 1034 }; 1035 MODULE_ALIAS_FS("ceph"); 1036 1037 static int __init init_ceph(void) 1038 { 1039 int ret = init_caches(); 1040 if (ret) 1041 goto out; 1042 1043 ceph_flock_init(); 1044 ceph_xattr_init(); 1045 ret = ceph_snap_init(); 1046 if (ret) 1047 goto out_xattr; 1048 ret = register_filesystem(&ceph_fs_type); 1049 if (ret) 1050 goto out_snap; 1051 1052 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1053 1054 return 0; 1055 1056 out_snap: 1057 ceph_snap_exit(); 1058 out_xattr: 1059 ceph_xattr_exit(); 1060 destroy_caches(); 1061 out: 1062 return ret; 1063 } 1064 1065 static void __exit exit_ceph(void) 1066 { 1067 dout("exit_ceph\n"); 1068 unregister_filesystem(&ceph_fs_type); 1069 ceph_snap_exit(); 1070 ceph_xattr_exit(); 1071 destroy_caches(); 1072 } 1073 1074 module_init(init_ceph); 1075 module_exit(exit_ceph); 1076 1077 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1078 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1079 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1080 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1081 MODULE_LICENSE("GPL"); 1082