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_mds_namespace, 124 Opt_last_string, 125 /* string args above */ 126 Opt_dirstat, 127 Opt_nodirstat, 128 Opt_rbytes, 129 Opt_norbytes, 130 Opt_asyncreaddir, 131 Opt_noasyncreaddir, 132 Opt_dcache, 133 Opt_nodcache, 134 Opt_ino32, 135 Opt_noino32, 136 Opt_fscache, 137 Opt_nofscache, 138 Opt_poolperm, 139 Opt_nopoolperm, 140 Opt_require_active_mds, 141 Opt_norequire_active_mds, 142 #ifdef CONFIG_CEPH_FS_POSIX_ACL 143 Opt_acl, 144 #endif 145 Opt_noacl, 146 }; 147 148 static match_table_t fsopt_tokens = { 149 {Opt_wsize, "wsize=%d"}, 150 {Opt_rsize, "rsize=%d"}, 151 {Opt_rasize, "rasize=%d"}, 152 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 153 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 154 {Opt_cap_release_safety, "cap_release_safety=%d"}, 155 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 156 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 157 {Opt_congestion_kb, "write_congestion_kb=%d"}, 158 /* int args above */ 159 {Opt_snapdirname, "snapdirname=%s"}, 160 {Opt_mds_namespace, "mds_namespace=%s"}, 161 /* string args above */ 162 {Opt_dirstat, "dirstat"}, 163 {Opt_nodirstat, "nodirstat"}, 164 {Opt_rbytes, "rbytes"}, 165 {Opt_norbytes, "norbytes"}, 166 {Opt_asyncreaddir, "asyncreaddir"}, 167 {Opt_noasyncreaddir, "noasyncreaddir"}, 168 {Opt_dcache, "dcache"}, 169 {Opt_nodcache, "nodcache"}, 170 {Opt_ino32, "ino32"}, 171 {Opt_noino32, "noino32"}, 172 {Opt_fscache, "fsc"}, 173 {Opt_nofscache, "nofsc"}, 174 {Opt_poolperm, "poolperm"}, 175 {Opt_nopoolperm, "nopoolperm"}, 176 {Opt_require_active_mds, "require_active_mds"}, 177 {Opt_norequire_active_mds, "norequire_active_mds"}, 178 #ifdef CONFIG_CEPH_FS_POSIX_ACL 179 {Opt_acl, "acl"}, 180 #endif 181 {Opt_noacl, "noacl"}, 182 {-1, NULL} 183 }; 184 185 static int parse_fsopt_token(char *c, void *private) 186 { 187 struct ceph_mount_options *fsopt = private; 188 substring_t argstr[MAX_OPT_ARGS]; 189 int token, intval, ret; 190 191 token = match_token((char *)c, fsopt_tokens, argstr); 192 if (token < 0) 193 return -EINVAL; 194 195 if (token < Opt_last_int) { 196 ret = match_int(&argstr[0], &intval); 197 if (ret < 0) { 198 pr_err("bad mount option arg (not int) " 199 "at '%s'\n", c); 200 return ret; 201 } 202 dout("got int token %d val %d\n", token, intval); 203 } else if (token > Opt_last_int && token < Opt_last_string) { 204 dout("got string token %d val %s\n", token, 205 argstr[0].from); 206 } else { 207 dout("got token %d\n", token); 208 } 209 210 switch (token) { 211 case Opt_snapdirname: 212 kfree(fsopt->snapdir_name); 213 fsopt->snapdir_name = kstrndup(argstr[0].from, 214 argstr[0].to-argstr[0].from, 215 GFP_KERNEL); 216 if (!fsopt->snapdir_name) 217 return -ENOMEM; 218 break; 219 case Opt_mds_namespace: 220 fsopt->mds_namespace = kstrndup(argstr[0].from, 221 argstr[0].to-argstr[0].from, 222 GFP_KERNEL); 223 if (!fsopt->mds_namespace) 224 return -ENOMEM; 225 break; 226 /* misc */ 227 case Opt_wsize: 228 fsopt->wsize = intval; 229 break; 230 case Opt_rsize: 231 fsopt->rsize = intval; 232 break; 233 case Opt_rasize: 234 fsopt->rasize = intval; 235 break; 236 case Opt_caps_wanted_delay_min: 237 fsopt->caps_wanted_delay_min = intval; 238 break; 239 case Opt_caps_wanted_delay_max: 240 fsopt->caps_wanted_delay_max = intval; 241 break; 242 case Opt_readdir_max_entries: 243 fsopt->max_readdir = intval; 244 break; 245 case Opt_readdir_max_bytes: 246 fsopt->max_readdir_bytes = intval; 247 break; 248 case Opt_congestion_kb: 249 fsopt->congestion_kb = intval; 250 break; 251 case Opt_dirstat: 252 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 253 break; 254 case Opt_nodirstat: 255 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 256 break; 257 case Opt_rbytes: 258 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 259 break; 260 case Opt_norbytes: 261 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 262 break; 263 case Opt_asyncreaddir: 264 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 265 break; 266 case Opt_noasyncreaddir: 267 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 268 break; 269 case Opt_dcache: 270 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 271 break; 272 case Opt_nodcache: 273 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 274 break; 275 case Opt_ino32: 276 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 277 break; 278 case Opt_noino32: 279 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 280 break; 281 case Opt_fscache: 282 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 283 break; 284 case Opt_nofscache: 285 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 286 break; 287 case Opt_poolperm: 288 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 289 printk ("pool perm"); 290 break; 291 case Opt_nopoolperm: 292 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 293 break; 294 case Opt_require_active_mds: 295 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT; 296 break; 297 case Opt_norequire_active_mds: 298 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT; 299 break; 300 #ifdef CONFIG_CEPH_FS_POSIX_ACL 301 case Opt_acl: 302 fsopt->sb_flags |= MS_POSIXACL; 303 break; 304 #endif 305 case Opt_noacl: 306 fsopt->sb_flags &= ~MS_POSIXACL; 307 break; 308 default: 309 BUG_ON(token); 310 } 311 return 0; 312 } 313 314 static void destroy_mount_options(struct ceph_mount_options *args) 315 { 316 dout("destroy_mount_options %p\n", args); 317 kfree(args->snapdir_name); 318 kfree(args->mds_namespace); 319 kfree(args->server_path); 320 kfree(args); 321 } 322 323 static int strcmp_null(const char *s1, const char *s2) 324 { 325 if (!s1 && !s2) 326 return 0; 327 if (s1 && !s2) 328 return -1; 329 if (!s1 && s2) 330 return 1; 331 return strcmp(s1, s2); 332 } 333 334 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 335 struct ceph_options *new_opt, 336 struct ceph_fs_client *fsc) 337 { 338 struct ceph_mount_options *fsopt1 = new_fsopt; 339 struct ceph_mount_options *fsopt2 = fsc->mount_options; 340 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 341 int ret; 342 343 ret = memcmp(fsopt1, fsopt2, ofs); 344 if (ret) 345 return ret; 346 347 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 348 if (ret) 349 return ret; 350 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); 351 if (ret) 352 return ret; 353 354 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 355 if (ret) 356 return ret; 357 358 return ceph_compare_options(new_opt, fsc->client); 359 } 360 361 static int parse_mount_options(struct ceph_mount_options **pfsopt, 362 struct ceph_options **popt, 363 int flags, char *options, 364 const char *dev_name) 365 { 366 struct ceph_mount_options *fsopt; 367 const char *dev_name_end; 368 int err; 369 370 if (!dev_name || !*dev_name) 371 return -EINVAL; 372 373 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 374 if (!fsopt) 375 return -ENOMEM; 376 377 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 378 379 fsopt->sb_flags = flags; 380 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 381 382 fsopt->rsize = CEPH_RSIZE_DEFAULT; 383 fsopt->rasize = CEPH_RASIZE_DEFAULT; 384 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 385 if (!fsopt->snapdir_name) { 386 err = -ENOMEM; 387 goto out; 388 } 389 390 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 391 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 392 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 393 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 394 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 395 fsopt->congestion_kb = default_congestion_kb(); 396 397 /* 398 * Distinguish the server list from the path in "dev_name". 399 * Internally we do not include the leading '/' in the path. 400 * 401 * "dev_name" will look like: 402 * <server_spec>[,<server_spec>...]:[<path>] 403 * where 404 * <server_spec> is <ip>[:<port>] 405 * <path> is optional, but if present must begin with '/' 406 */ 407 dev_name_end = strchr(dev_name, '/'); 408 if (dev_name_end) { 409 if (strlen(dev_name_end) > 1) { 410 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 411 if (!fsopt->server_path) { 412 err = -ENOMEM; 413 goto out; 414 } 415 } 416 } else { 417 dev_name_end = dev_name + strlen(dev_name); 418 } 419 err = -EINVAL; 420 dev_name_end--; /* back up to ':' separator */ 421 if (dev_name_end < dev_name || *dev_name_end != ':') { 422 pr_err("device name is missing path (no : separator in %s)\n", 423 dev_name); 424 goto out; 425 } 426 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 427 if (fsopt->server_path) 428 dout("server path '%s'\n", fsopt->server_path); 429 430 *popt = ceph_parse_options(options, dev_name, dev_name_end, 431 parse_fsopt_token, (void *)fsopt); 432 if (IS_ERR(*popt)) { 433 err = PTR_ERR(*popt); 434 goto out; 435 } 436 437 /* success */ 438 *pfsopt = fsopt; 439 return 0; 440 441 out: 442 destroy_mount_options(fsopt); 443 return err; 444 } 445 446 /** 447 * ceph_show_options - Show mount options in /proc/mounts 448 * @m: seq_file to write to 449 * @root: root of that (sub)tree 450 */ 451 static int ceph_show_options(struct seq_file *m, struct dentry *root) 452 { 453 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 454 struct ceph_mount_options *fsopt = fsc->mount_options; 455 size_t pos; 456 int ret; 457 458 /* a comma between MNT/MS and client options */ 459 seq_putc(m, ','); 460 pos = m->count; 461 462 ret = ceph_print_client_options(m, fsc->client); 463 if (ret) 464 return ret; 465 466 /* retract our comma if no client options */ 467 if (m->count == pos) 468 m->count--; 469 470 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 471 seq_puts(m, ",dirstat"); 472 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 473 seq_puts(m, ",rbytes"); 474 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 475 seq_puts(m, ",noasyncreaddir"); 476 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 477 seq_puts(m, ",nodcache"); 478 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 479 seq_puts(m, ",fsc"); 480 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 481 seq_puts(m, ",nopoolperm"); 482 483 #ifdef CONFIG_CEPH_FS_POSIX_ACL 484 if (fsopt->sb_flags & MS_POSIXACL) 485 seq_puts(m, ",acl"); 486 else 487 seq_puts(m, ",noacl"); 488 #endif 489 490 if (fsopt->mds_namespace) 491 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace); 492 if (fsopt->wsize) 493 seq_printf(m, ",wsize=%d", fsopt->wsize); 494 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 495 seq_printf(m, ",rsize=%d", fsopt->rsize); 496 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 497 seq_printf(m, ",rasize=%d", fsopt->rasize); 498 if (fsopt->congestion_kb != default_congestion_kb()) 499 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 500 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 501 seq_printf(m, ",caps_wanted_delay_min=%d", 502 fsopt->caps_wanted_delay_min); 503 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 504 seq_printf(m, ",caps_wanted_delay_max=%d", 505 fsopt->caps_wanted_delay_max); 506 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 507 seq_printf(m, ",cap_release_safety=%d", 508 fsopt->cap_release_safety); 509 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 510 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 511 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 512 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 513 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 514 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 515 516 return 0; 517 } 518 519 /* 520 * handle any mon messages the standard library doesn't understand. 521 * return error if we don't either. 522 */ 523 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 524 { 525 struct ceph_fs_client *fsc = client->private; 526 int type = le16_to_cpu(msg->hdr.type); 527 528 switch (type) { 529 case CEPH_MSG_MDS_MAP: 530 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 531 return 0; 532 case CEPH_MSG_FS_MAP_USER: 533 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 534 return 0; 535 default: 536 return -1; 537 } 538 } 539 540 /* 541 * create a new fs client 542 */ 543 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 544 struct ceph_options *opt) 545 { 546 struct ceph_fs_client *fsc; 547 const u64 supported_features = 548 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH | 549 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA; 550 const u64 required_features = 0; 551 int page_count; 552 size_t size; 553 int err = -ENOMEM; 554 555 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 556 if (!fsc) 557 return ERR_PTR(-ENOMEM); 558 559 fsc->client = ceph_create_client(opt, fsc, supported_features, 560 required_features); 561 if (IS_ERR(fsc->client)) { 562 err = PTR_ERR(fsc->client); 563 goto fail; 564 } 565 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 566 567 if (fsopt->mds_namespace == NULL) { 568 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 569 0, true); 570 } else { 571 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 572 0, false); 573 } 574 575 fsc->mount_options = fsopt; 576 577 fsc->sb = NULL; 578 fsc->mount_state = CEPH_MOUNT_MOUNTING; 579 580 atomic_long_set(&fsc->writeback_count, 0); 581 582 err = -ENOMEM; 583 /* 584 * The number of concurrent works can be high but they don't need 585 * to be processed in parallel, limit concurrency. 586 */ 587 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 588 if (fsc->wb_wq == NULL) 589 goto fail_client; 590 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 591 if (fsc->pg_inv_wq == NULL) 592 goto fail_wb_wq; 593 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 594 if (fsc->trunc_wq == NULL) 595 goto fail_pg_inv_wq; 596 597 /* set up mempools */ 598 err = -ENOMEM; 599 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 600 size = sizeof (struct page *) * (page_count ? page_count : 1); 601 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 602 if (!fsc->wb_pagevec_pool) 603 goto fail_trunc_wq; 604 605 /* setup fscache */ 606 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 607 (ceph_fscache_register_fs(fsc) != 0)) 608 goto fail_fscache; 609 610 /* caps */ 611 fsc->min_caps = fsopt->max_readdir; 612 613 return fsc; 614 615 fail_fscache: 616 ceph_fscache_unregister_fs(fsc); 617 fail_trunc_wq: 618 destroy_workqueue(fsc->trunc_wq); 619 fail_pg_inv_wq: 620 destroy_workqueue(fsc->pg_inv_wq); 621 fail_wb_wq: 622 destroy_workqueue(fsc->wb_wq); 623 fail_client: 624 ceph_destroy_client(fsc->client); 625 fail: 626 kfree(fsc); 627 return ERR_PTR(err); 628 } 629 630 static void destroy_fs_client(struct ceph_fs_client *fsc) 631 { 632 dout("destroy_fs_client %p\n", fsc); 633 634 ceph_fscache_unregister_fs(fsc); 635 636 destroy_workqueue(fsc->wb_wq); 637 destroy_workqueue(fsc->pg_inv_wq); 638 destroy_workqueue(fsc->trunc_wq); 639 640 mempool_destroy(fsc->wb_pagevec_pool); 641 642 destroy_mount_options(fsc->mount_options); 643 644 ceph_fs_debugfs_cleanup(fsc); 645 646 ceph_destroy_client(fsc->client); 647 648 kfree(fsc); 649 dout("destroy_fs_client %p done\n", fsc); 650 } 651 652 /* 653 * caches 654 */ 655 struct kmem_cache *ceph_inode_cachep; 656 struct kmem_cache *ceph_cap_cachep; 657 struct kmem_cache *ceph_cap_flush_cachep; 658 struct kmem_cache *ceph_dentry_cachep; 659 struct kmem_cache *ceph_file_cachep; 660 661 static void ceph_inode_init_once(void *foo) 662 { 663 struct ceph_inode_info *ci = foo; 664 inode_init_once(&ci->vfs_inode); 665 } 666 667 static int __init init_caches(void) 668 { 669 int error = -ENOMEM; 670 671 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 672 sizeof(struct ceph_inode_info), 673 __alignof__(struct ceph_inode_info), 674 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 675 SLAB_ACCOUNT, ceph_inode_init_once); 676 if (ceph_inode_cachep == NULL) 677 return -ENOMEM; 678 679 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 680 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 681 if (ceph_cap_cachep == NULL) 682 goto bad_cap; 683 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 684 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 685 if (ceph_cap_flush_cachep == NULL) 686 goto bad_cap_flush; 687 688 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 689 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 690 if (ceph_dentry_cachep == NULL) 691 goto bad_dentry; 692 693 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 694 695 if (ceph_file_cachep == NULL) 696 goto bad_file; 697 698 if ((error = ceph_fscache_register())) 699 goto bad_file; 700 701 return 0; 702 bad_file: 703 kmem_cache_destroy(ceph_dentry_cachep); 704 bad_dentry: 705 kmem_cache_destroy(ceph_cap_flush_cachep); 706 bad_cap_flush: 707 kmem_cache_destroy(ceph_cap_cachep); 708 bad_cap: 709 kmem_cache_destroy(ceph_inode_cachep); 710 return error; 711 } 712 713 static void destroy_caches(void) 714 { 715 /* 716 * Make sure all delayed rcu free inodes are flushed before we 717 * destroy cache. 718 */ 719 rcu_barrier(); 720 721 kmem_cache_destroy(ceph_inode_cachep); 722 kmem_cache_destroy(ceph_cap_cachep); 723 kmem_cache_destroy(ceph_cap_flush_cachep); 724 kmem_cache_destroy(ceph_dentry_cachep); 725 kmem_cache_destroy(ceph_file_cachep); 726 727 ceph_fscache_unregister(); 728 } 729 730 731 /* 732 * ceph_umount_begin - initiate forced umount. Tear down down the 733 * mount, skipping steps that may hang while waiting for server(s). 734 */ 735 static void ceph_umount_begin(struct super_block *sb) 736 { 737 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 738 739 dout("ceph_umount_begin - starting forced umount\n"); 740 if (!fsc) 741 return; 742 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 743 ceph_mdsc_force_umount(fsc->mdsc); 744 return; 745 } 746 747 static const struct super_operations ceph_super_ops = { 748 .alloc_inode = ceph_alloc_inode, 749 .destroy_inode = ceph_destroy_inode, 750 .write_inode = ceph_write_inode, 751 .drop_inode = ceph_drop_inode, 752 .sync_fs = ceph_sync_fs, 753 .put_super = ceph_put_super, 754 .show_options = ceph_show_options, 755 .statfs = ceph_statfs, 756 .umount_begin = ceph_umount_begin, 757 }; 758 759 /* 760 * Bootstrap mount by opening the root directory. Note the mount 761 * @started time from caller, and time out if this takes too long. 762 */ 763 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 764 const char *path, 765 unsigned long started) 766 { 767 struct ceph_mds_client *mdsc = fsc->mdsc; 768 struct ceph_mds_request *req = NULL; 769 int err; 770 struct dentry *root; 771 772 /* open dir */ 773 dout("open_root_inode opening '%s'\n", path); 774 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 775 if (IS_ERR(req)) 776 return ERR_CAST(req); 777 req->r_path1 = kstrdup(path, GFP_NOFS); 778 if (!req->r_path1) { 779 root = ERR_PTR(-ENOMEM); 780 goto out; 781 } 782 783 req->r_ino1.ino = CEPH_INO_ROOT; 784 req->r_ino1.snap = CEPH_NOSNAP; 785 req->r_started = started; 786 req->r_timeout = fsc->client->options->mount_timeout; 787 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 788 req->r_num_caps = 2; 789 err = ceph_mdsc_do_request(mdsc, NULL, req); 790 if (err == 0) { 791 struct inode *inode = req->r_target_inode; 792 req->r_target_inode = NULL; 793 dout("open_root_inode success\n"); 794 root = d_make_root(inode); 795 if (!root) { 796 root = ERR_PTR(-ENOMEM); 797 goto out; 798 } 799 dout("open_root_inode success, root dentry is %p\n", root); 800 } else { 801 root = ERR_PTR(err); 802 } 803 out: 804 ceph_mdsc_put_request(req); 805 return root; 806 } 807 808 809 810 811 /* 812 * mount: join the ceph cluster, and open root directory. 813 */ 814 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 815 { 816 int err; 817 unsigned long started = jiffies; /* note the start time */ 818 struct dentry *root; 819 int first = 0; /* first vfsmount for this super_block */ 820 821 dout("mount start %p\n", fsc); 822 mutex_lock(&fsc->client->mount_mutex); 823 824 if (!fsc->sb->s_root) { 825 const char *path; 826 err = __ceph_open_session(fsc->client, started); 827 if (err < 0) 828 goto out; 829 830 if (!fsc->mount_options->server_path) { 831 path = ""; 832 dout("mount opening path \\t\n"); 833 } else { 834 path = fsc->mount_options->server_path + 1; 835 dout("mount opening path %s\n", path); 836 } 837 root = open_root_dentry(fsc, path, started); 838 if (IS_ERR(root)) { 839 err = PTR_ERR(root); 840 goto out; 841 } 842 fsc->sb->s_root = dget(root); 843 first = 1; 844 845 err = ceph_fs_debugfs_init(fsc); 846 if (err < 0) 847 goto fail; 848 } else { 849 root = dget(fsc->sb->s_root); 850 } 851 852 fsc->mount_state = CEPH_MOUNT_MOUNTED; 853 dout("mount success\n"); 854 mutex_unlock(&fsc->client->mount_mutex); 855 return root; 856 857 fail: 858 if (first) { 859 dput(fsc->sb->s_root); 860 fsc->sb->s_root = NULL; 861 } 862 out: 863 mutex_unlock(&fsc->client->mount_mutex); 864 return ERR_PTR(err); 865 } 866 867 static int ceph_set_super(struct super_block *s, void *data) 868 { 869 struct ceph_fs_client *fsc = data; 870 int ret; 871 872 dout("set_super %p data %p\n", s, data); 873 874 s->s_flags = fsc->mount_options->sb_flags; 875 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 876 877 s->s_xattr = ceph_xattr_handlers; 878 s->s_fs_info = fsc; 879 fsc->sb = s; 880 881 s->s_op = &ceph_super_ops; 882 s->s_d_op = &ceph_dentry_ops; 883 s->s_export_op = &ceph_export_ops; 884 885 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 886 887 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 888 if (ret != 0) 889 goto fail; 890 891 return ret; 892 893 fail: 894 s->s_fs_info = NULL; 895 fsc->sb = NULL; 896 return ret; 897 } 898 899 /* 900 * share superblock if same fs AND options 901 */ 902 static int ceph_compare_super(struct super_block *sb, void *data) 903 { 904 struct ceph_fs_client *new = data; 905 struct ceph_mount_options *fsopt = new->mount_options; 906 struct ceph_options *opt = new->client->options; 907 struct ceph_fs_client *other = ceph_sb_to_client(sb); 908 909 dout("ceph_compare_super %p\n", sb); 910 911 if (compare_mount_options(fsopt, opt, other)) { 912 dout("monitor(s)/mount options don't match\n"); 913 return 0; 914 } 915 if ((opt->flags & CEPH_OPT_FSID) && 916 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 917 dout("fsid doesn't match\n"); 918 return 0; 919 } 920 if (fsopt->sb_flags != other->mount_options->sb_flags) { 921 dout("flags differ\n"); 922 return 0; 923 } 924 return 1; 925 } 926 927 /* 928 * construct our own bdi so we can control readahead, etc. 929 */ 930 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 931 932 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc) 933 { 934 int err; 935 936 err = super_setup_bdi_name(sb, "ceph-%ld", 937 atomic_long_inc_return(&bdi_seq)); 938 if (err) 939 return err; 940 941 /* set ra_pages based on rasize mount option? */ 942 if (fsc->mount_options->rasize >= PAGE_SIZE) 943 sb->s_bdi->ra_pages = 944 (fsc->mount_options->rasize + PAGE_SIZE - 1) 945 >> PAGE_SHIFT; 946 else 947 sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE; 948 949 if (fsc->mount_options->rsize > fsc->mount_options->rasize && 950 fsc->mount_options->rsize >= PAGE_SIZE) 951 sb->s_bdi->io_pages = 952 (fsc->mount_options->rsize + PAGE_SIZE - 1) 953 >> PAGE_SHIFT; 954 else if (fsc->mount_options->rsize == 0) 955 sb->s_bdi->io_pages = ULONG_MAX; 956 957 return 0; 958 } 959 960 static struct dentry *ceph_mount(struct file_system_type *fs_type, 961 int flags, const char *dev_name, void *data) 962 { 963 struct super_block *sb; 964 struct ceph_fs_client *fsc; 965 struct dentry *res; 966 int err; 967 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 968 struct ceph_mount_options *fsopt = NULL; 969 struct ceph_options *opt = NULL; 970 971 dout("ceph_mount\n"); 972 973 #ifdef CONFIG_CEPH_FS_POSIX_ACL 974 flags |= MS_POSIXACL; 975 #endif 976 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 977 if (err < 0) { 978 res = ERR_PTR(err); 979 goto out_final; 980 } 981 982 /* create client (which we may/may not use) */ 983 fsc = create_fs_client(fsopt, opt); 984 if (IS_ERR(fsc)) { 985 res = ERR_CAST(fsc); 986 destroy_mount_options(fsopt); 987 ceph_destroy_options(opt); 988 goto out_final; 989 } 990 991 err = ceph_mdsc_init(fsc); 992 if (err < 0) { 993 res = ERR_PTR(err); 994 goto out; 995 } 996 997 if (ceph_test_opt(fsc->client, NOSHARE)) 998 compare_super = NULL; 999 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1000 if (IS_ERR(sb)) { 1001 res = ERR_CAST(sb); 1002 goto out; 1003 } 1004 1005 if (ceph_sb_to_client(sb) != fsc) { 1006 ceph_mdsc_destroy(fsc); 1007 destroy_fs_client(fsc); 1008 fsc = ceph_sb_to_client(sb); 1009 dout("get_sb got existing client %p\n", fsc); 1010 } else { 1011 dout("get_sb using new client %p\n", fsc); 1012 err = ceph_setup_bdi(sb, fsc); 1013 if (err < 0) { 1014 res = ERR_PTR(err); 1015 goto out_splat; 1016 } 1017 } 1018 1019 res = ceph_real_mount(fsc); 1020 if (IS_ERR(res)) 1021 goto out_splat; 1022 dout("root %p inode %p ino %llx.%llx\n", res, 1023 d_inode(res), ceph_vinop(d_inode(res))); 1024 return res; 1025 1026 out_splat: 1027 ceph_mdsc_close_sessions(fsc->mdsc); 1028 deactivate_locked_super(sb); 1029 goto out_final; 1030 1031 out: 1032 ceph_mdsc_destroy(fsc); 1033 destroy_fs_client(fsc); 1034 out_final: 1035 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1036 return res; 1037 } 1038 1039 static void ceph_kill_sb(struct super_block *s) 1040 { 1041 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1042 dev_t dev = s->s_dev; 1043 1044 dout("kill_sb %p\n", s); 1045 1046 ceph_mdsc_pre_umount(fsc->mdsc); 1047 generic_shutdown_super(s); 1048 ceph_mdsc_destroy(fsc); 1049 1050 destroy_fs_client(fsc); 1051 free_anon_bdev(dev); 1052 } 1053 1054 static struct file_system_type ceph_fs_type = { 1055 .owner = THIS_MODULE, 1056 .name = "ceph", 1057 .mount = ceph_mount, 1058 .kill_sb = ceph_kill_sb, 1059 .fs_flags = FS_RENAME_DOES_D_MOVE, 1060 }; 1061 MODULE_ALIAS_FS("ceph"); 1062 1063 static int __init init_ceph(void) 1064 { 1065 int ret = init_caches(); 1066 if (ret) 1067 goto out; 1068 1069 ceph_flock_init(); 1070 ceph_xattr_init(); 1071 ret = register_filesystem(&ceph_fs_type); 1072 if (ret) 1073 goto out_xattr; 1074 1075 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1076 1077 return 0; 1078 1079 out_xattr: 1080 ceph_xattr_exit(); 1081 destroy_caches(); 1082 out: 1083 return ret; 1084 } 1085 1086 static void __exit exit_ceph(void) 1087 { 1088 dout("exit_ceph\n"); 1089 unregister_filesystem(&ceph_fs_type); 1090 ceph_xattr_exit(); 1091 destroy_caches(); 1092 } 1093 1094 module_init(init_ceph); 1095 module_exit(exit_ceph); 1096 1097 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1098 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1099 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1100 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1101 MODULE_LICENSE("GPL"); 1102