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 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 400 if (!fsopt->server_path) { 401 err = -ENOMEM; 402 goto out; 403 } 404 } else { 405 dev_name_end = dev_name + strlen(dev_name); 406 } 407 err = -EINVAL; 408 dev_name_end--; /* back up to ':' separator */ 409 if (dev_name_end < dev_name || *dev_name_end != ':') { 410 pr_err("device name is missing path (no : separator in %s)\n", 411 dev_name); 412 goto out; 413 } 414 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 415 if (fsopt->server_path) 416 dout("server path '%s'\n", fsopt->server_path); 417 418 *popt = ceph_parse_options(options, dev_name, dev_name_end, 419 parse_fsopt_token, (void *)fsopt); 420 if (IS_ERR(*popt)) { 421 err = PTR_ERR(*popt); 422 goto out; 423 } 424 425 /* success */ 426 *pfsopt = fsopt; 427 return 0; 428 429 out: 430 destroy_mount_options(fsopt); 431 return err; 432 } 433 434 /** 435 * ceph_show_options - Show mount options in /proc/mounts 436 * @m: seq_file to write to 437 * @root: root of that (sub)tree 438 */ 439 static int ceph_show_options(struct seq_file *m, struct dentry *root) 440 { 441 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 442 struct ceph_mount_options *fsopt = fsc->mount_options; 443 size_t pos; 444 int ret; 445 446 /* a comma between MNT/MS and client options */ 447 seq_putc(m, ','); 448 pos = m->count; 449 450 ret = ceph_print_client_options(m, fsc->client); 451 if (ret) 452 return ret; 453 454 /* retract our comma if no client options */ 455 if (m->count == pos) 456 m->count--; 457 458 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 459 seq_puts(m, ",dirstat"); 460 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 461 seq_puts(m, ",rbytes"); 462 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 463 seq_puts(m, ",noasyncreaddir"); 464 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 465 seq_puts(m, ",nodcache"); 466 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 467 seq_puts(m, ",fsc"); 468 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 469 seq_puts(m, ",nopoolperm"); 470 471 #ifdef CONFIG_CEPH_FS_POSIX_ACL 472 if (fsopt->sb_flags & MS_POSIXACL) 473 seq_puts(m, ",acl"); 474 else 475 seq_puts(m, ",noacl"); 476 #endif 477 478 if (fsopt->mds_namespace) 479 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace); 480 if (fsopt->wsize) 481 seq_printf(m, ",wsize=%d", fsopt->wsize); 482 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 483 seq_printf(m, ",rsize=%d", fsopt->rsize); 484 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 485 seq_printf(m, ",rasize=%d", fsopt->rasize); 486 if (fsopt->congestion_kb != default_congestion_kb()) 487 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 488 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 489 seq_printf(m, ",caps_wanted_delay_min=%d", 490 fsopt->caps_wanted_delay_min); 491 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 492 seq_printf(m, ",caps_wanted_delay_max=%d", 493 fsopt->caps_wanted_delay_max); 494 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 495 seq_printf(m, ",cap_release_safety=%d", 496 fsopt->cap_release_safety); 497 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 498 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 499 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 500 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 501 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 502 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 503 504 return 0; 505 } 506 507 /* 508 * handle any mon messages the standard library doesn't understand. 509 * return error if we don't either. 510 */ 511 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 512 { 513 struct ceph_fs_client *fsc = client->private; 514 int type = le16_to_cpu(msg->hdr.type); 515 516 switch (type) { 517 case CEPH_MSG_MDS_MAP: 518 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 519 return 0; 520 case CEPH_MSG_FS_MAP_USER: 521 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 522 return 0; 523 default: 524 return -1; 525 } 526 } 527 528 /* 529 * create a new fs client 530 */ 531 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 532 struct ceph_options *opt) 533 { 534 struct ceph_fs_client *fsc; 535 const u64 supported_features = 536 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH | 537 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA; 538 const u64 required_features = 0; 539 int page_count; 540 size_t size; 541 int err = -ENOMEM; 542 543 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 544 if (!fsc) 545 return ERR_PTR(-ENOMEM); 546 547 fsc->client = ceph_create_client(opt, fsc, supported_features, 548 required_features); 549 if (IS_ERR(fsc->client)) { 550 err = PTR_ERR(fsc->client); 551 goto fail; 552 } 553 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 554 555 if (fsopt->mds_namespace == NULL) { 556 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 557 0, true); 558 } else { 559 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 560 0, false); 561 } 562 563 fsc->mount_options = fsopt; 564 565 fsc->sb = NULL; 566 fsc->mount_state = CEPH_MOUNT_MOUNTING; 567 568 atomic_long_set(&fsc->writeback_count, 0); 569 570 err = bdi_init(&fsc->backing_dev_info); 571 if (err < 0) 572 goto fail_client; 573 574 err = -ENOMEM; 575 /* 576 * The number of concurrent works can be high but they don't need 577 * to be processed in parallel, limit concurrency. 578 */ 579 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 580 if (fsc->wb_wq == NULL) 581 goto fail_bdi; 582 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 583 if (fsc->pg_inv_wq == NULL) 584 goto fail_wb_wq; 585 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 586 if (fsc->trunc_wq == NULL) 587 goto fail_pg_inv_wq; 588 589 /* set up mempools */ 590 err = -ENOMEM; 591 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 592 size = sizeof (struct page *) * (page_count ? page_count : 1); 593 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 594 if (!fsc->wb_pagevec_pool) 595 goto fail_trunc_wq; 596 597 /* setup fscache */ 598 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 599 (ceph_fscache_register_fs(fsc) != 0)) 600 goto fail_fscache; 601 602 /* caps */ 603 fsc->min_caps = fsopt->max_readdir; 604 605 return fsc; 606 607 fail_fscache: 608 ceph_fscache_unregister_fs(fsc); 609 fail_trunc_wq: 610 destroy_workqueue(fsc->trunc_wq); 611 fail_pg_inv_wq: 612 destroy_workqueue(fsc->pg_inv_wq); 613 fail_wb_wq: 614 destroy_workqueue(fsc->wb_wq); 615 fail_bdi: 616 bdi_destroy(&fsc->backing_dev_info); 617 fail_client: 618 ceph_destroy_client(fsc->client); 619 fail: 620 kfree(fsc); 621 return ERR_PTR(err); 622 } 623 624 static void destroy_fs_client(struct ceph_fs_client *fsc) 625 { 626 dout("destroy_fs_client %p\n", fsc); 627 628 ceph_fscache_unregister_fs(fsc); 629 630 destroy_workqueue(fsc->wb_wq); 631 destroy_workqueue(fsc->pg_inv_wq); 632 destroy_workqueue(fsc->trunc_wq); 633 634 bdi_destroy(&fsc->backing_dev_info); 635 636 mempool_destroy(fsc->wb_pagevec_pool); 637 638 destroy_mount_options(fsc->mount_options); 639 640 ceph_fs_debugfs_cleanup(fsc); 641 642 ceph_destroy_client(fsc->client); 643 644 kfree(fsc); 645 dout("destroy_fs_client %p done\n", fsc); 646 } 647 648 /* 649 * caches 650 */ 651 struct kmem_cache *ceph_inode_cachep; 652 struct kmem_cache *ceph_cap_cachep; 653 struct kmem_cache *ceph_cap_flush_cachep; 654 struct kmem_cache *ceph_dentry_cachep; 655 struct kmem_cache *ceph_file_cachep; 656 657 static void ceph_inode_init_once(void *foo) 658 { 659 struct ceph_inode_info *ci = foo; 660 inode_init_once(&ci->vfs_inode); 661 } 662 663 static int __init init_caches(void) 664 { 665 int error = -ENOMEM; 666 667 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 668 sizeof(struct ceph_inode_info), 669 __alignof__(struct ceph_inode_info), 670 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 671 SLAB_ACCOUNT, ceph_inode_init_once); 672 if (ceph_inode_cachep == NULL) 673 return -ENOMEM; 674 675 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 676 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 677 if (ceph_cap_cachep == NULL) 678 goto bad_cap; 679 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 680 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 681 if (ceph_cap_flush_cachep == NULL) 682 goto bad_cap_flush; 683 684 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 685 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 686 if (ceph_dentry_cachep == NULL) 687 goto bad_dentry; 688 689 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 690 691 if (ceph_file_cachep == NULL) 692 goto bad_file; 693 694 if ((error = ceph_fscache_register())) 695 goto bad_file; 696 697 return 0; 698 bad_file: 699 kmem_cache_destroy(ceph_dentry_cachep); 700 bad_dentry: 701 kmem_cache_destroy(ceph_cap_flush_cachep); 702 bad_cap_flush: 703 kmem_cache_destroy(ceph_cap_cachep); 704 bad_cap: 705 kmem_cache_destroy(ceph_inode_cachep); 706 return error; 707 } 708 709 static void destroy_caches(void) 710 { 711 /* 712 * Make sure all delayed rcu free inodes are flushed before we 713 * destroy cache. 714 */ 715 rcu_barrier(); 716 717 kmem_cache_destroy(ceph_inode_cachep); 718 kmem_cache_destroy(ceph_cap_cachep); 719 kmem_cache_destroy(ceph_cap_flush_cachep); 720 kmem_cache_destroy(ceph_dentry_cachep); 721 kmem_cache_destroy(ceph_file_cachep); 722 723 ceph_fscache_unregister(); 724 } 725 726 727 /* 728 * ceph_umount_begin - initiate forced umount. Tear down down the 729 * mount, skipping steps that may hang while waiting for server(s). 730 */ 731 static void ceph_umount_begin(struct super_block *sb) 732 { 733 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 734 735 dout("ceph_umount_begin - starting forced umount\n"); 736 if (!fsc) 737 return; 738 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 739 ceph_mdsc_force_umount(fsc->mdsc); 740 return; 741 } 742 743 static const struct super_operations ceph_super_ops = { 744 .alloc_inode = ceph_alloc_inode, 745 .destroy_inode = ceph_destroy_inode, 746 .write_inode = ceph_write_inode, 747 .drop_inode = ceph_drop_inode, 748 .evict_inode = ceph_evict_inode, 749 .sync_fs = ceph_sync_fs, 750 .put_super = ceph_put_super, 751 .show_options = ceph_show_options, 752 .statfs = ceph_statfs, 753 .umount_begin = ceph_umount_begin, 754 }; 755 756 /* 757 * Bootstrap mount by opening the root directory. Note the mount 758 * @started time from caller, and time out if this takes too long. 759 */ 760 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 761 const char *path, 762 unsigned long started) 763 { 764 struct ceph_mds_client *mdsc = fsc->mdsc; 765 struct ceph_mds_request *req = NULL; 766 int err; 767 struct dentry *root; 768 769 /* open dir */ 770 dout("open_root_inode opening '%s'\n", path); 771 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 772 if (IS_ERR(req)) 773 return ERR_CAST(req); 774 req->r_path1 = kstrdup(path, GFP_NOFS); 775 if (!req->r_path1) { 776 root = ERR_PTR(-ENOMEM); 777 goto out; 778 } 779 780 req->r_ino1.ino = CEPH_INO_ROOT; 781 req->r_ino1.snap = CEPH_NOSNAP; 782 req->r_started = started; 783 req->r_timeout = fsc->client->options->mount_timeout; 784 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 785 req->r_num_caps = 2; 786 err = ceph_mdsc_do_request(mdsc, NULL, req); 787 if (err == 0) { 788 struct inode *inode = req->r_target_inode; 789 req->r_target_inode = NULL; 790 dout("open_root_inode success\n"); 791 if (ceph_ino(inode) == CEPH_INO_ROOT && 792 fsc->sb->s_root == NULL) { 793 root = d_make_root(inode); 794 if (!root) { 795 root = ERR_PTR(-ENOMEM); 796 goto out; 797 } 798 } else { 799 root = d_obtain_root(inode); 800 } 801 ceph_init_dentry(root); 802 dout("open_root_inode success, root dentry is %p\n", root); 803 } else { 804 root = ERR_PTR(err); 805 } 806 out: 807 ceph_mdsc_put_request(req); 808 return root; 809 } 810 811 812 813 814 /* 815 * mount: join the ceph cluster, and open root directory. 816 */ 817 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 818 { 819 int err; 820 unsigned long started = jiffies; /* note the start time */ 821 struct dentry *root; 822 int first = 0; /* first vfsmount for this super_block */ 823 824 dout("mount start %p\n", fsc); 825 mutex_lock(&fsc->client->mount_mutex); 826 827 if (!fsc->sb->s_root) { 828 err = __ceph_open_session(fsc->client, started); 829 if (err < 0) 830 goto out; 831 832 dout("mount opening root\n"); 833 root = open_root_dentry(fsc, "", started); 834 if (IS_ERR(root)) { 835 err = PTR_ERR(root); 836 goto out; 837 } 838 fsc->sb->s_root = root; 839 first = 1; 840 841 err = ceph_fs_debugfs_init(fsc); 842 if (err < 0) 843 goto fail; 844 } 845 846 if (!fsc->mount_options->server_path) { 847 root = fsc->sb->s_root; 848 dget(root); 849 } else { 850 const char *path = fsc->mount_options->server_path + 1; 851 dout("mount opening path %s\n", path); 852 root = open_root_dentry(fsc, path, started); 853 if (IS_ERR(root)) { 854 err = PTR_ERR(root); 855 goto fail; 856 } 857 } 858 859 fsc->mount_state = CEPH_MOUNT_MOUNTED; 860 dout("mount success\n"); 861 mutex_unlock(&fsc->client->mount_mutex); 862 return root; 863 864 fail: 865 if (first) { 866 dput(fsc->sb->s_root); 867 fsc->sb->s_root = NULL; 868 } 869 out: 870 mutex_unlock(&fsc->client->mount_mutex); 871 return ERR_PTR(err); 872 } 873 874 static int ceph_set_super(struct super_block *s, void *data) 875 { 876 struct ceph_fs_client *fsc = data; 877 int ret; 878 879 dout("set_super %p data %p\n", s, data); 880 881 s->s_flags = fsc->mount_options->sb_flags; 882 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 883 884 s->s_xattr = ceph_xattr_handlers; 885 s->s_fs_info = fsc; 886 fsc->sb = s; 887 888 s->s_op = &ceph_super_ops; 889 s->s_export_op = &ceph_export_ops; 890 891 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 892 893 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 894 if (ret != 0) 895 goto fail; 896 897 return ret; 898 899 fail: 900 s->s_fs_info = NULL; 901 fsc->sb = NULL; 902 return ret; 903 } 904 905 /* 906 * share superblock if same fs AND options 907 */ 908 static int ceph_compare_super(struct super_block *sb, void *data) 909 { 910 struct ceph_fs_client *new = data; 911 struct ceph_mount_options *fsopt = new->mount_options; 912 struct ceph_options *opt = new->client->options; 913 struct ceph_fs_client *other = ceph_sb_to_client(sb); 914 915 dout("ceph_compare_super %p\n", sb); 916 917 if (compare_mount_options(fsopt, opt, other)) { 918 dout("monitor(s)/mount options don't match\n"); 919 return 0; 920 } 921 if ((opt->flags & CEPH_OPT_FSID) && 922 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 923 dout("fsid doesn't match\n"); 924 return 0; 925 } 926 if (fsopt->sb_flags != other->mount_options->sb_flags) { 927 dout("flags differ\n"); 928 return 0; 929 } 930 return 1; 931 } 932 933 /* 934 * construct our own bdi so we can control readahead, etc. 935 */ 936 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 937 938 static int ceph_register_bdi(struct super_block *sb, 939 struct ceph_fs_client *fsc) 940 { 941 int err; 942 943 /* set ra_pages based on rasize mount option? */ 944 if (fsc->mount_options->rasize >= PAGE_SIZE) 945 fsc->backing_dev_info.ra_pages = 946 (fsc->mount_options->rasize + PAGE_SIZE - 1) 947 >> PAGE_SHIFT; 948 else 949 fsc->backing_dev_info.ra_pages = 950 VM_MAX_READAHEAD * 1024 / PAGE_SIZE; 951 952 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 953 atomic_long_inc_return(&bdi_seq)); 954 if (!err) 955 sb->s_bdi = &fsc->backing_dev_info; 956 return err; 957 } 958 959 static struct dentry *ceph_mount(struct file_system_type *fs_type, 960 int flags, const char *dev_name, void *data) 961 { 962 struct super_block *sb; 963 struct ceph_fs_client *fsc; 964 struct dentry *res; 965 int err; 966 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 967 struct ceph_mount_options *fsopt = NULL; 968 struct ceph_options *opt = NULL; 969 970 dout("ceph_mount\n"); 971 972 #ifdef CONFIG_CEPH_FS_POSIX_ACL 973 flags |= MS_POSIXACL; 974 #endif 975 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 976 if (err < 0) { 977 res = ERR_PTR(err); 978 goto out_final; 979 } 980 981 /* create client (which we may/may not use) */ 982 fsc = create_fs_client(fsopt, opt); 983 if (IS_ERR(fsc)) { 984 res = ERR_CAST(fsc); 985 destroy_mount_options(fsopt); 986 ceph_destroy_options(opt); 987 goto out_final; 988 } 989 990 err = ceph_mdsc_init(fsc); 991 if (err < 0) { 992 res = ERR_PTR(err); 993 goto out; 994 } 995 996 if (ceph_test_opt(fsc->client, NOSHARE)) 997 compare_super = NULL; 998 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 999 if (IS_ERR(sb)) { 1000 res = ERR_CAST(sb); 1001 goto out; 1002 } 1003 1004 if (ceph_sb_to_client(sb) != fsc) { 1005 ceph_mdsc_destroy(fsc); 1006 destroy_fs_client(fsc); 1007 fsc = ceph_sb_to_client(sb); 1008 dout("get_sb got existing client %p\n", fsc); 1009 } else { 1010 dout("get_sb using new client %p\n", fsc); 1011 err = ceph_register_bdi(sb, fsc); 1012 if (err < 0) { 1013 res = ERR_PTR(err); 1014 goto out_splat; 1015 } 1016 } 1017 1018 res = ceph_real_mount(fsc); 1019 if (IS_ERR(res)) 1020 goto out_splat; 1021 dout("root %p inode %p ino %llx.%llx\n", res, 1022 d_inode(res), ceph_vinop(d_inode(res))); 1023 return res; 1024 1025 out_splat: 1026 ceph_mdsc_close_sessions(fsc->mdsc); 1027 deactivate_locked_super(sb); 1028 goto out_final; 1029 1030 out: 1031 ceph_mdsc_destroy(fsc); 1032 destroy_fs_client(fsc); 1033 out_final: 1034 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1035 return res; 1036 } 1037 1038 static void ceph_kill_sb(struct super_block *s) 1039 { 1040 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1041 dev_t dev = s->s_dev; 1042 1043 dout("kill_sb %p\n", s); 1044 1045 ceph_mdsc_pre_umount(fsc->mdsc); 1046 generic_shutdown_super(s); 1047 ceph_mdsc_destroy(fsc); 1048 1049 destroy_fs_client(fsc); 1050 free_anon_bdev(dev); 1051 } 1052 1053 static struct file_system_type ceph_fs_type = { 1054 .owner = THIS_MODULE, 1055 .name = "ceph", 1056 .mount = ceph_mount, 1057 .kill_sb = ceph_kill_sb, 1058 .fs_flags = FS_RENAME_DOES_D_MOVE, 1059 }; 1060 MODULE_ALIAS_FS("ceph"); 1061 1062 static int __init init_ceph(void) 1063 { 1064 int ret = init_caches(); 1065 if (ret) 1066 goto out; 1067 1068 ceph_flock_init(); 1069 ceph_xattr_init(); 1070 ret = register_filesystem(&ceph_fs_type); 1071 if (ret) 1072 goto out_xattr; 1073 1074 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1075 1076 return 0; 1077 1078 out_xattr: 1079 ceph_xattr_exit(); 1080 destroy_caches(); 1081 out: 1082 return ret; 1083 } 1084 1085 static void __exit exit_ceph(void) 1086 { 1087 dout("exit_ceph\n"); 1088 unregister_filesystem(&ceph_fs_type); 1089 ceph_xattr_exit(); 1090 destroy_caches(); 1091 } 1092 1093 module_init(init_ceph); 1094 module_exit(exit_ceph); 1095 1096 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1097 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1098 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1099 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1100 MODULE_LICENSE("GPL"); 1101