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