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 = bdi_init(&fsc->backing_dev_info); 583 if (err < 0) 584 goto fail_client; 585 586 err = -ENOMEM; 587 /* 588 * The number of concurrent works can be high but they don't need 589 * to be processed in parallel, limit concurrency. 590 */ 591 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 592 if (fsc->wb_wq == NULL) 593 goto fail_bdi; 594 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 595 if (fsc->pg_inv_wq == NULL) 596 goto fail_wb_wq; 597 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 598 if (fsc->trunc_wq == NULL) 599 goto fail_pg_inv_wq; 600 601 /* set up mempools */ 602 err = -ENOMEM; 603 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 604 size = sizeof (struct page *) * (page_count ? page_count : 1); 605 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 606 if (!fsc->wb_pagevec_pool) 607 goto fail_trunc_wq; 608 609 /* setup fscache */ 610 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 611 (ceph_fscache_register_fs(fsc) != 0)) 612 goto fail_fscache; 613 614 /* caps */ 615 fsc->min_caps = fsopt->max_readdir; 616 617 return fsc; 618 619 fail_fscache: 620 ceph_fscache_unregister_fs(fsc); 621 fail_trunc_wq: 622 destroy_workqueue(fsc->trunc_wq); 623 fail_pg_inv_wq: 624 destroy_workqueue(fsc->pg_inv_wq); 625 fail_wb_wq: 626 destroy_workqueue(fsc->wb_wq); 627 fail_bdi: 628 bdi_destroy(&fsc->backing_dev_info); 629 fail_client: 630 ceph_destroy_client(fsc->client); 631 fail: 632 kfree(fsc); 633 return ERR_PTR(err); 634 } 635 636 static void destroy_fs_client(struct ceph_fs_client *fsc) 637 { 638 dout("destroy_fs_client %p\n", fsc); 639 640 ceph_fscache_unregister_fs(fsc); 641 642 destroy_workqueue(fsc->wb_wq); 643 destroy_workqueue(fsc->pg_inv_wq); 644 destroy_workqueue(fsc->trunc_wq); 645 646 bdi_destroy(&fsc->backing_dev_info); 647 648 mempool_destroy(fsc->wb_pagevec_pool); 649 650 destroy_mount_options(fsc->mount_options); 651 652 ceph_fs_debugfs_cleanup(fsc); 653 654 ceph_destroy_client(fsc->client); 655 656 kfree(fsc); 657 dout("destroy_fs_client %p done\n", fsc); 658 } 659 660 /* 661 * caches 662 */ 663 struct kmem_cache *ceph_inode_cachep; 664 struct kmem_cache *ceph_cap_cachep; 665 struct kmem_cache *ceph_cap_flush_cachep; 666 struct kmem_cache *ceph_dentry_cachep; 667 struct kmem_cache *ceph_file_cachep; 668 669 static void ceph_inode_init_once(void *foo) 670 { 671 struct ceph_inode_info *ci = foo; 672 inode_init_once(&ci->vfs_inode); 673 } 674 675 static int __init init_caches(void) 676 { 677 int error = -ENOMEM; 678 679 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 680 sizeof(struct ceph_inode_info), 681 __alignof__(struct ceph_inode_info), 682 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 683 SLAB_ACCOUNT, ceph_inode_init_once); 684 if (ceph_inode_cachep == NULL) 685 return -ENOMEM; 686 687 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 688 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 689 if (ceph_cap_cachep == NULL) 690 goto bad_cap; 691 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 692 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 693 if (ceph_cap_flush_cachep == NULL) 694 goto bad_cap_flush; 695 696 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 697 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 698 if (ceph_dentry_cachep == NULL) 699 goto bad_dentry; 700 701 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 702 703 if (ceph_file_cachep == NULL) 704 goto bad_file; 705 706 if ((error = ceph_fscache_register())) 707 goto bad_file; 708 709 return 0; 710 bad_file: 711 kmem_cache_destroy(ceph_dentry_cachep); 712 bad_dentry: 713 kmem_cache_destroy(ceph_cap_flush_cachep); 714 bad_cap_flush: 715 kmem_cache_destroy(ceph_cap_cachep); 716 bad_cap: 717 kmem_cache_destroy(ceph_inode_cachep); 718 return error; 719 } 720 721 static void destroy_caches(void) 722 { 723 /* 724 * Make sure all delayed rcu free inodes are flushed before we 725 * destroy cache. 726 */ 727 rcu_barrier(); 728 729 kmem_cache_destroy(ceph_inode_cachep); 730 kmem_cache_destroy(ceph_cap_cachep); 731 kmem_cache_destroy(ceph_cap_flush_cachep); 732 kmem_cache_destroy(ceph_dentry_cachep); 733 kmem_cache_destroy(ceph_file_cachep); 734 735 ceph_fscache_unregister(); 736 } 737 738 739 /* 740 * ceph_umount_begin - initiate forced umount. Tear down down the 741 * mount, skipping steps that may hang while waiting for server(s). 742 */ 743 static void ceph_umount_begin(struct super_block *sb) 744 { 745 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 746 747 dout("ceph_umount_begin - starting forced umount\n"); 748 if (!fsc) 749 return; 750 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 751 ceph_mdsc_force_umount(fsc->mdsc); 752 return; 753 } 754 755 static const struct super_operations ceph_super_ops = { 756 .alloc_inode = ceph_alloc_inode, 757 .destroy_inode = ceph_destroy_inode, 758 .write_inode = ceph_write_inode, 759 .drop_inode = ceph_drop_inode, 760 .sync_fs = ceph_sync_fs, 761 .put_super = ceph_put_super, 762 .show_options = ceph_show_options, 763 .statfs = ceph_statfs, 764 .umount_begin = ceph_umount_begin, 765 }; 766 767 /* 768 * Bootstrap mount by opening the root directory. Note the mount 769 * @started time from caller, and time out if this takes too long. 770 */ 771 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 772 const char *path, 773 unsigned long started) 774 { 775 struct ceph_mds_client *mdsc = fsc->mdsc; 776 struct ceph_mds_request *req = NULL; 777 int err; 778 struct dentry *root; 779 780 /* open dir */ 781 dout("open_root_inode opening '%s'\n", path); 782 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 783 if (IS_ERR(req)) 784 return ERR_CAST(req); 785 req->r_path1 = kstrdup(path, GFP_NOFS); 786 if (!req->r_path1) { 787 root = ERR_PTR(-ENOMEM); 788 goto out; 789 } 790 791 req->r_ino1.ino = CEPH_INO_ROOT; 792 req->r_ino1.snap = CEPH_NOSNAP; 793 req->r_started = started; 794 req->r_timeout = fsc->client->options->mount_timeout; 795 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 796 req->r_num_caps = 2; 797 err = ceph_mdsc_do_request(mdsc, NULL, req); 798 if (err == 0) { 799 struct inode *inode = req->r_target_inode; 800 req->r_target_inode = NULL; 801 dout("open_root_inode success\n"); 802 root = d_make_root(inode); 803 if (!root) { 804 root = ERR_PTR(-ENOMEM); 805 goto out; 806 } 807 dout("open_root_inode success, root dentry is %p\n", root); 808 } else { 809 root = ERR_PTR(err); 810 } 811 out: 812 ceph_mdsc_put_request(req); 813 return root; 814 } 815 816 817 818 819 /* 820 * mount: join the ceph cluster, and open root directory. 821 */ 822 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 823 { 824 int err; 825 unsigned long started = jiffies; /* note the start time */ 826 struct dentry *root; 827 int first = 0; /* first vfsmount for this super_block */ 828 829 dout("mount start %p\n", fsc); 830 mutex_lock(&fsc->client->mount_mutex); 831 832 if (!fsc->sb->s_root) { 833 const char *path; 834 err = __ceph_open_session(fsc->client, started); 835 if (err < 0) 836 goto out; 837 838 if (!fsc->mount_options->server_path) { 839 path = ""; 840 dout("mount opening path \\t\n"); 841 } else { 842 path = fsc->mount_options->server_path + 1; 843 dout("mount opening path %s\n", path); 844 } 845 root = open_root_dentry(fsc, path, started); 846 if (IS_ERR(root)) { 847 err = PTR_ERR(root); 848 goto out; 849 } 850 fsc->sb->s_root = dget(root); 851 first = 1; 852 853 err = ceph_fs_debugfs_init(fsc); 854 if (err < 0) 855 goto fail; 856 } else { 857 root = dget(fsc->sb->s_root); 858 } 859 860 fsc->mount_state = CEPH_MOUNT_MOUNTED; 861 dout("mount success\n"); 862 mutex_unlock(&fsc->client->mount_mutex); 863 return root; 864 865 fail: 866 if (first) { 867 dput(fsc->sb->s_root); 868 fsc->sb->s_root = NULL; 869 } 870 out: 871 mutex_unlock(&fsc->client->mount_mutex); 872 return ERR_PTR(err); 873 } 874 875 static int ceph_set_super(struct super_block *s, void *data) 876 { 877 struct ceph_fs_client *fsc = data; 878 int ret; 879 880 dout("set_super %p data %p\n", s, data); 881 882 s->s_flags = fsc->mount_options->sb_flags; 883 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 884 885 s->s_xattr = ceph_xattr_handlers; 886 s->s_fs_info = fsc; 887 fsc->sb = s; 888 889 s->s_op = &ceph_super_ops; 890 s->s_d_op = &ceph_dentry_ops; 891 s->s_export_op = &ceph_export_ops; 892 893 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 894 895 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 896 if (ret != 0) 897 goto fail; 898 899 return ret; 900 901 fail: 902 s->s_fs_info = NULL; 903 fsc->sb = NULL; 904 return ret; 905 } 906 907 /* 908 * share superblock if same fs AND options 909 */ 910 static int ceph_compare_super(struct super_block *sb, void *data) 911 { 912 struct ceph_fs_client *new = data; 913 struct ceph_mount_options *fsopt = new->mount_options; 914 struct ceph_options *opt = new->client->options; 915 struct ceph_fs_client *other = ceph_sb_to_client(sb); 916 917 dout("ceph_compare_super %p\n", sb); 918 919 if (compare_mount_options(fsopt, opt, other)) { 920 dout("monitor(s)/mount options don't match\n"); 921 return 0; 922 } 923 if ((opt->flags & CEPH_OPT_FSID) && 924 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 925 dout("fsid doesn't match\n"); 926 return 0; 927 } 928 if (fsopt->sb_flags != other->mount_options->sb_flags) { 929 dout("flags differ\n"); 930 return 0; 931 } 932 return 1; 933 } 934 935 /* 936 * construct our own bdi so we can control readahead, etc. 937 */ 938 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 939 940 static int ceph_register_bdi(struct super_block *sb, 941 struct ceph_fs_client *fsc) 942 { 943 int err; 944 945 /* set ra_pages based on rasize mount option? */ 946 if (fsc->mount_options->rasize >= PAGE_SIZE) 947 fsc->backing_dev_info.ra_pages = 948 (fsc->mount_options->rasize + PAGE_SIZE - 1) 949 >> PAGE_SHIFT; 950 else 951 fsc->backing_dev_info.ra_pages = 952 VM_MAX_READAHEAD * 1024 / PAGE_SIZE; 953 954 if (fsc->mount_options->rsize > fsc->mount_options->rasize && 955 fsc->mount_options->rsize >= PAGE_SIZE) 956 fsc->backing_dev_info.io_pages = 957 (fsc->mount_options->rsize + PAGE_SIZE - 1) 958 >> PAGE_SHIFT; 959 else if (fsc->mount_options->rsize == 0) 960 fsc->backing_dev_info.io_pages = ULONG_MAX; 961 962 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 963 atomic_long_inc_return(&bdi_seq)); 964 if (!err) 965 sb->s_bdi = &fsc->backing_dev_info; 966 return err; 967 } 968 969 static struct dentry *ceph_mount(struct file_system_type *fs_type, 970 int flags, const char *dev_name, void *data) 971 { 972 struct super_block *sb; 973 struct ceph_fs_client *fsc; 974 struct dentry *res; 975 int err; 976 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 977 struct ceph_mount_options *fsopt = NULL; 978 struct ceph_options *opt = NULL; 979 980 dout("ceph_mount\n"); 981 982 #ifdef CONFIG_CEPH_FS_POSIX_ACL 983 flags |= MS_POSIXACL; 984 #endif 985 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 986 if (err < 0) { 987 res = ERR_PTR(err); 988 goto out_final; 989 } 990 991 /* create client (which we may/may not use) */ 992 fsc = create_fs_client(fsopt, opt); 993 if (IS_ERR(fsc)) { 994 res = ERR_CAST(fsc); 995 destroy_mount_options(fsopt); 996 ceph_destroy_options(opt); 997 goto out_final; 998 } 999 1000 err = ceph_mdsc_init(fsc); 1001 if (err < 0) { 1002 res = ERR_PTR(err); 1003 goto out; 1004 } 1005 1006 if (ceph_test_opt(fsc->client, NOSHARE)) 1007 compare_super = NULL; 1008 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1009 if (IS_ERR(sb)) { 1010 res = ERR_CAST(sb); 1011 goto out; 1012 } 1013 1014 if (ceph_sb_to_client(sb) != fsc) { 1015 ceph_mdsc_destroy(fsc); 1016 destroy_fs_client(fsc); 1017 fsc = ceph_sb_to_client(sb); 1018 dout("get_sb got existing client %p\n", fsc); 1019 } else { 1020 dout("get_sb using new client %p\n", fsc); 1021 err = ceph_register_bdi(sb, fsc); 1022 if (err < 0) { 1023 res = ERR_PTR(err); 1024 goto out_splat; 1025 } 1026 } 1027 1028 res = ceph_real_mount(fsc); 1029 if (IS_ERR(res)) 1030 goto out_splat; 1031 dout("root %p inode %p ino %llx.%llx\n", res, 1032 d_inode(res), ceph_vinop(d_inode(res))); 1033 return res; 1034 1035 out_splat: 1036 ceph_mdsc_close_sessions(fsc->mdsc); 1037 deactivate_locked_super(sb); 1038 goto out_final; 1039 1040 out: 1041 ceph_mdsc_destroy(fsc); 1042 destroy_fs_client(fsc); 1043 out_final: 1044 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1045 return res; 1046 } 1047 1048 static void ceph_kill_sb(struct super_block *s) 1049 { 1050 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1051 dev_t dev = s->s_dev; 1052 1053 dout("kill_sb %p\n", s); 1054 1055 ceph_mdsc_pre_umount(fsc->mdsc); 1056 generic_shutdown_super(s); 1057 ceph_mdsc_destroy(fsc); 1058 1059 destroy_fs_client(fsc); 1060 free_anon_bdev(dev); 1061 } 1062 1063 static struct file_system_type ceph_fs_type = { 1064 .owner = THIS_MODULE, 1065 .name = "ceph", 1066 .mount = ceph_mount, 1067 .kill_sb = ceph_kill_sb, 1068 .fs_flags = FS_RENAME_DOES_D_MOVE, 1069 }; 1070 MODULE_ALIAS_FS("ceph"); 1071 1072 static int __init init_ceph(void) 1073 { 1074 int ret = init_caches(); 1075 if (ret) 1076 goto out; 1077 1078 ceph_flock_init(); 1079 ceph_xattr_init(); 1080 ret = register_filesystem(&ceph_fs_type); 1081 if (ret) 1082 goto out_xattr; 1083 1084 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1085 1086 return 0; 1087 1088 out_xattr: 1089 ceph_xattr_exit(); 1090 destroy_caches(); 1091 out: 1092 return ret; 1093 } 1094 1095 static void __exit exit_ceph(void) 1096 { 1097 dout("exit_ceph\n"); 1098 unregister_filesystem(&ceph_fs_type); 1099 ceph_xattr_exit(); 1100 destroy_caches(); 1101 } 1102 1103 module_init(init_ceph); 1104 module_exit(exit_ceph); 1105 1106 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1107 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1108 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1109 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1110 MODULE_LICENSE("GPL"); 1111