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 u64 data_pool; 53 54 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) { 55 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0]; 56 } else { 57 data_pool = CEPH_NOPOOL; 58 } 59 60 dout("statfs\n"); 61 err = ceph_monc_do_statfs(&fsc->client->monc, data_pool, &st); 62 if (err < 0) 63 return err; 64 65 /* fill in kstatfs */ 66 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 67 68 /* 69 * express utilization in terms of large blocks to avoid 70 * overflow on 32-bit machines. 71 * 72 * NOTE: for the time being, we make bsize == frsize to humor 73 * not-yet-ancient versions of glibc that are broken. 74 * Someday, we will probably want to report a real block 75 * size... whatever that may mean for a network file system! 76 */ 77 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 78 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 79 80 /* 81 * By default use root quota for stats; fallback to overall filesystem 82 * usage if using 'noquotadf' mount option or if the root dir doesn't 83 * have max_bytes quota set. 84 */ 85 if (ceph_test_mount_opt(fsc, NOQUOTADF) || 86 !ceph_quota_update_statfs(fsc, buf)) { 87 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 88 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 89 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 90 } 91 92 buf->f_files = le64_to_cpu(st.num_objects); 93 buf->f_ffree = -1; 94 buf->f_namelen = NAME_MAX; 95 96 /* Must convert the fsid, for consistent values across arches */ 97 fsid = le64_to_cpu(*(__le64 *)(&monmap->fsid)) ^ 98 le64_to_cpu(*((__le64 *)&monmap->fsid + 1)); 99 buf->f_fsid.val[0] = fsid & 0xffffffff; 100 buf->f_fsid.val[1] = fsid >> 32; 101 102 return 0; 103 } 104 105 106 static int ceph_sync_fs(struct super_block *sb, int wait) 107 { 108 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 109 110 if (!wait) { 111 dout("sync_fs (non-blocking)\n"); 112 ceph_flush_dirty_caps(fsc->mdsc); 113 dout("sync_fs (non-blocking) done\n"); 114 return 0; 115 } 116 117 dout("sync_fs (blocking)\n"); 118 ceph_osdc_sync(&fsc->client->osdc); 119 ceph_mdsc_sync(fsc->mdsc); 120 dout("sync_fs (blocking) done\n"); 121 return 0; 122 } 123 124 /* 125 * mount options 126 */ 127 enum { 128 Opt_wsize, 129 Opt_rsize, 130 Opt_rasize, 131 Opt_caps_wanted_delay_min, 132 Opt_caps_wanted_delay_max, 133 Opt_readdir_max_entries, 134 Opt_readdir_max_bytes, 135 Opt_congestion_kb, 136 Opt_last_int, 137 /* int args above */ 138 Opt_snapdirname, 139 Opt_mds_namespace, 140 Opt_fscache_uniq, 141 Opt_last_string, 142 /* string args above */ 143 Opt_dirstat, 144 Opt_nodirstat, 145 Opt_rbytes, 146 Opt_norbytes, 147 Opt_asyncreaddir, 148 Opt_noasyncreaddir, 149 Opt_dcache, 150 Opt_nodcache, 151 Opt_ino32, 152 Opt_noino32, 153 Opt_fscache, 154 Opt_nofscache, 155 Opt_poolperm, 156 Opt_nopoolperm, 157 Opt_require_active_mds, 158 Opt_norequire_active_mds, 159 #ifdef CONFIG_CEPH_FS_POSIX_ACL 160 Opt_acl, 161 #endif 162 Opt_noacl, 163 Opt_quotadf, 164 Opt_noquotadf, 165 }; 166 167 static match_table_t fsopt_tokens = { 168 {Opt_wsize, "wsize=%d"}, 169 {Opt_rsize, "rsize=%d"}, 170 {Opt_rasize, "rasize=%d"}, 171 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 172 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 173 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 174 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 175 {Opt_congestion_kb, "write_congestion_kb=%d"}, 176 /* int args above */ 177 {Opt_snapdirname, "snapdirname=%s"}, 178 {Opt_mds_namespace, "mds_namespace=%s"}, 179 {Opt_fscache_uniq, "fsc=%s"}, 180 /* string args above */ 181 {Opt_dirstat, "dirstat"}, 182 {Opt_nodirstat, "nodirstat"}, 183 {Opt_rbytes, "rbytes"}, 184 {Opt_norbytes, "norbytes"}, 185 {Opt_asyncreaddir, "asyncreaddir"}, 186 {Opt_noasyncreaddir, "noasyncreaddir"}, 187 {Opt_dcache, "dcache"}, 188 {Opt_nodcache, "nodcache"}, 189 {Opt_ino32, "ino32"}, 190 {Opt_noino32, "noino32"}, 191 {Opt_fscache, "fsc"}, 192 {Opt_nofscache, "nofsc"}, 193 {Opt_poolperm, "poolperm"}, 194 {Opt_nopoolperm, "nopoolperm"}, 195 {Opt_require_active_mds, "require_active_mds"}, 196 {Opt_norequire_active_mds, "norequire_active_mds"}, 197 #ifdef CONFIG_CEPH_FS_POSIX_ACL 198 {Opt_acl, "acl"}, 199 #endif 200 {Opt_noacl, "noacl"}, 201 {Opt_quotadf, "quotadf"}, 202 {Opt_noquotadf, "noquotadf"}, 203 {-1, NULL} 204 }; 205 206 static int parse_fsopt_token(char *c, void *private) 207 { 208 struct ceph_mount_options *fsopt = private; 209 substring_t argstr[MAX_OPT_ARGS]; 210 int token, intval, ret; 211 212 token = match_token((char *)c, fsopt_tokens, argstr); 213 if (token < 0) 214 return -EINVAL; 215 216 if (token < Opt_last_int) { 217 ret = match_int(&argstr[0], &intval); 218 if (ret < 0) { 219 pr_err("bad mount option arg (not int) " 220 "at '%s'\n", c); 221 return ret; 222 } 223 dout("got int token %d val %d\n", token, intval); 224 } else if (token > Opt_last_int && token < Opt_last_string) { 225 dout("got string token %d val %s\n", token, 226 argstr[0].from); 227 } else { 228 dout("got token %d\n", token); 229 } 230 231 switch (token) { 232 case Opt_snapdirname: 233 kfree(fsopt->snapdir_name); 234 fsopt->snapdir_name = kstrndup(argstr[0].from, 235 argstr[0].to-argstr[0].from, 236 GFP_KERNEL); 237 if (!fsopt->snapdir_name) 238 return -ENOMEM; 239 break; 240 case Opt_mds_namespace: 241 kfree(fsopt->mds_namespace); 242 fsopt->mds_namespace = kstrndup(argstr[0].from, 243 argstr[0].to-argstr[0].from, 244 GFP_KERNEL); 245 if (!fsopt->mds_namespace) 246 return -ENOMEM; 247 break; 248 case Opt_fscache_uniq: 249 kfree(fsopt->fscache_uniq); 250 fsopt->fscache_uniq = kstrndup(argstr[0].from, 251 argstr[0].to-argstr[0].from, 252 GFP_KERNEL); 253 if (!fsopt->fscache_uniq) 254 return -ENOMEM; 255 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 256 break; 257 /* misc */ 258 case Opt_wsize: 259 if (intval < PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE) 260 return -EINVAL; 261 fsopt->wsize = ALIGN(intval, PAGE_SIZE); 262 break; 263 case Opt_rsize: 264 if (intval < PAGE_SIZE || intval > CEPH_MAX_READ_SIZE) 265 return -EINVAL; 266 fsopt->rsize = ALIGN(intval, PAGE_SIZE); 267 break; 268 case Opt_rasize: 269 if (intval < 0) 270 return -EINVAL; 271 fsopt->rasize = ALIGN(intval + PAGE_SIZE - 1, PAGE_SIZE); 272 break; 273 case Opt_caps_wanted_delay_min: 274 if (intval < 1) 275 return -EINVAL; 276 fsopt->caps_wanted_delay_min = intval; 277 break; 278 case Opt_caps_wanted_delay_max: 279 if (intval < 1) 280 return -EINVAL; 281 fsopt->caps_wanted_delay_max = intval; 282 break; 283 case Opt_readdir_max_entries: 284 if (intval < 1) 285 return -EINVAL; 286 fsopt->max_readdir = intval; 287 break; 288 case Opt_readdir_max_bytes: 289 if (intval < PAGE_SIZE && intval != 0) 290 return -EINVAL; 291 fsopt->max_readdir_bytes = intval; 292 break; 293 case Opt_congestion_kb: 294 if (intval < 1024) /* at least 1M */ 295 return -EINVAL; 296 fsopt->congestion_kb = intval; 297 break; 298 case Opt_dirstat: 299 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 300 break; 301 case Opt_nodirstat: 302 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 303 break; 304 case Opt_rbytes: 305 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 306 break; 307 case Opt_norbytes: 308 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 309 break; 310 case Opt_asyncreaddir: 311 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 312 break; 313 case Opt_noasyncreaddir: 314 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 315 break; 316 case Opt_dcache: 317 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 318 break; 319 case Opt_nodcache: 320 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 321 break; 322 case Opt_ino32: 323 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 324 break; 325 case Opt_noino32: 326 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 327 break; 328 case Opt_fscache: 329 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 330 kfree(fsopt->fscache_uniq); 331 fsopt->fscache_uniq = NULL; 332 break; 333 case Opt_nofscache: 334 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 335 kfree(fsopt->fscache_uniq); 336 fsopt->fscache_uniq = NULL; 337 break; 338 case Opt_poolperm: 339 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 340 break; 341 case Opt_nopoolperm: 342 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 343 break; 344 case Opt_require_active_mds: 345 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT; 346 break; 347 case Opt_norequire_active_mds: 348 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT; 349 break; 350 case Opt_quotadf: 351 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF; 352 break; 353 case Opt_noquotadf: 354 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF; 355 break; 356 #ifdef CONFIG_CEPH_FS_POSIX_ACL 357 case Opt_acl: 358 fsopt->sb_flags |= SB_POSIXACL; 359 break; 360 #endif 361 case Opt_noacl: 362 fsopt->sb_flags &= ~SB_POSIXACL; 363 break; 364 default: 365 BUG_ON(token); 366 } 367 return 0; 368 } 369 370 static void destroy_mount_options(struct ceph_mount_options *args) 371 { 372 dout("destroy_mount_options %p\n", args); 373 kfree(args->snapdir_name); 374 kfree(args->mds_namespace); 375 kfree(args->server_path); 376 kfree(args->fscache_uniq); 377 kfree(args); 378 } 379 380 static int strcmp_null(const char *s1, const char *s2) 381 { 382 if (!s1 && !s2) 383 return 0; 384 if (s1 && !s2) 385 return -1; 386 if (!s1 && s2) 387 return 1; 388 return strcmp(s1, s2); 389 } 390 391 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 392 struct ceph_options *new_opt, 393 struct ceph_fs_client *fsc) 394 { 395 struct ceph_mount_options *fsopt1 = new_fsopt; 396 struct ceph_mount_options *fsopt2 = fsc->mount_options; 397 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 398 int ret; 399 400 ret = memcmp(fsopt1, fsopt2, ofs); 401 if (ret) 402 return ret; 403 404 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 405 if (ret) 406 return ret; 407 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); 408 if (ret) 409 return ret; 410 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 411 if (ret) 412 return ret; 413 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq); 414 if (ret) 415 return ret; 416 417 return ceph_compare_options(new_opt, fsc->client); 418 } 419 420 static int parse_mount_options(struct ceph_mount_options **pfsopt, 421 struct ceph_options **popt, 422 int flags, char *options, 423 const char *dev_name) 424 { 425 struct ceph_mount_options *fsopt; 426 const char *dev_name_end; 427 int err; 428 429 if (!dev_name || !*dev_name) 430 return -EINVAL; 431 432 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 433 if (!fsopt) 434 return -ENOMEM; 435 436 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 437 438 fsopt->sb_flags = flags; 439 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 440 441 fsopt->wsize = CEPH_MAX_WRITE_SIZE; 442 fsopt->rsize = CEPH_MAX_READ_SIZE; 443 fsopt->rasize = CEPH_RASIZE_DEFAULT; 444 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 445 if (!fsopt->snapdir_name) { 446 err = -ENOMEM; 447 goto out; 448 } 449 450 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 451 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 452 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 453 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 454 fsopt->congestion_kb = default_congestion_kb(); 455 456 /* 457 * Distinguish the server list from the path in "dev_name". 458 * Internally we do not include the leading '/' in the path. 459 * 460 * "dev_name" will look like: 461 * <server_spec>[,<server_spec>...]:[<path>] 462 * where 463 * <server_spec> is <ip>[:<port>] 464 * <path> is optional, but if present must begin with '/' 465 */ 466 dev_name_end = strchr(dev_name, '/'); 467 if (dev_name_end) { 468 if (strlen(dev_name_end) > 1) { 469 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 470 if (!fsopt->server_path) { 471 err = -ENOMEM; 472 goto out; 473 } 474 } 475 } else { 476 dev_name_end = dev_name + strlen(dev_name); 477 } 478 err = -EINVAL; 479 dev_name_end--; /* back up to ':' separator */ 480 if (dev_name_end < dev_name || *dev_name_end != ':') { 481 pr_err("device name is missing path (no : separator in %s)\n", 482 dev_name); 483 goto out; 484 } 485 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 486 if (fsopt->server_path) 487 dout("server path '%s'\n", fsopt->server_path); 488 489 *popt = ceph_parse_options(options, dev_name, dev_name_end, 490 parse_fsopt_token, (void *)fsopt); 491 if (IS_ERR(*popt)) { 492 err = PTR_ERR(*popt); 493 goto out; 494 } 495 496 /* success */ 497 *pfsopt = fsopt; 498 return 0; 499 500 out: 501 destroy_mount_options(fsopt); 502 return err; 503 } 504 505 /** 506 * ceph_show_options - Show mount options in /proc/mounts 507 * @m: seq_file to write to 508 * @root: root of that (sub)tree 509 */ 510 static int ceph_show_options(struct seq_file *m, struct dentry *root) 511 { 512 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 513 struct ceph_mount_options *fsopt = fsc->mount_options; 514 size_t pos; 515 int ret; 516 517 /* a comma between MNT/MS and client options */ 518 seq_putc(m, ','); 519 pos = m->count; 520 521 ret = ceph_print_client_options(m, fsc->client); 522 if (ret) 523 return ret; 524 525 /* retract our comma if no client options */ 526 if (m->count == pos) 527 m->count--; 528 529 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 530 seq_puts(m, ",dirstat"); 531 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 532 seq_puts(m, ",rbytes"); 533 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 534 seq_puts(m, ",noasyncreaddir"); 535 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 536 seq_puts(m, ",nodcache"); 537 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) { 538 seq_show_option(m, "fsc", fsopt->fscache_uniq); 539 } 540 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 541 seq_puts(m, ",nopoolperm"); 542 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF) 543 seq_puts(m, ",noquotadf"); 544 545 #ifdef CONFIG_CEPH_FS_POSIX_ACL 546 if (fsopt->sb_flags & SB_POSIXACL) 547 seq_puts(m, ",acl"); 548 else 549 seq_puts(m, ",noacl"); 550 #endif 551 552 if (fsopt->mds_namespace) 553 seq_show_option(m, "mds_namespace", fsopt->mds_namespace); 554 if (fsopt->wsize) 555 seq_printf(m, ",wsize=%d", fsopt->wsize); 556 if (fsopt->rsize != CEPH_MAX_READ_SIZE) 557 seq_printf(m, ",rsize=%d", fsopt->rsize); 558 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 559 seq_printf(m, ",rasize=%d", fsopt->rasize); 560 if (fsopt->congestion_kb != default_congestion_kb()) 561 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 562 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 563 seq_printf(m, ",caps_wanted_delay_min=%d", 564 fsopt->caps_wanted_delay_min); 565 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 566 seq_printf(m, ",caps_wanted_delay_max=%d", 567 fsopt->caps_wanted_delay_max); 568 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 569 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 570 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 571 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 572 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 573 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 574 575 return 0; 576 } 577 578 /* 579 * handle any mon messages the standard library doesn't understand. 580 * return error if we don't either. 581 */ 582 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 583 { 584 struct ceph_fs_client *fsc = client->private; 585 int type = le16_to_cpu(msg->hdr.type); 586 587 switch (type) { 588 case CEPH_MSG_MDS_MAP: 589 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 590 return 0; 591 case CEPH_MSG_FS_MAP_USER: 592 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 593 return 0; 594 default: 595 return -1; 596 } 597 } 598 599 /* 600 * create a new fs client 601 */ 602 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 603 struct ceph_options *opt) 604 { 605 struct ceph_fs_client *fsc; 606 int page_count; 607 size_t size; 608 int err = -ENOMEM; 609 610 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 611 if (!fsc) 612 return ERR_PTR(-ENOMEM); 613 614 fsc->client = ceph_create_client(opt, fsc); 615 if (IS_ERR(fsc->client)) { 616 err = PTR_ERR(fsc->client); 617 goto fail; 618 } 619 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 620 621 if (!fsopt->mds_namespace) { 622 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 623 0, true); 624 } else { 625 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 626 0, false); 627 } 628 629 fsc->mount_options = fsopt; 630 631 fsc->sb = NULL; 632 fsc->mount_state = CEPH_MOUNT_MOUNTING; 633 634 atomic_long_set(&fsc->writeback_count, 0); 635 636 err = -ENOMEM; 637 /* 638 * The number of concurrent works can be high but they don't need 639 * to be processed in parallel, limit concurrency. 640 */ 641 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 642 if (!fsc->wb_wq) 643 goto fail_client; 644 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 645 if (!fsc->pg_inv_wq) 646 goto fail_wb_wq; 647 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 648 if (!fsc->trunc_wq) 649 goto fail_pg_inv_wq; 650 651 /* set up mempools */ 652 err = -ENOMEM; 653 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 654 size = sizeof (struct page *) * (page_count ? page_count : 1); 655 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 656 if (!fsc->wb_pagevec_pool) 657 goto fail_trunc_wq; 658 659 /* caps */ 660 fsc->min_caps = fsopt->max_readdir; 661 662 return fsc; 663 664 fail_trunc_wq: 665 destroy_workqueue(fsc->trunc_wq); 666 fail_pg_inv_wq: 667 destroy_workqueue(fsc->pg_inv_wq); 668 fail_wb_wq: 669 destroy_workqueue(fsc->wb_wq); 670 fail_client: 671 ceph_destroy_client(fsc->client); 672 fail: 673 kfree(fsc); 674 return ERR_PTR(err); 675 } 676 677 static void destroy_fs_client(struct ceph_fs_client *fsc) 678 { 679 dout("destroy_fs_client %p\n", fsc); 680 681 destroy_workqueue(fsc->wb_wq); 682 destroy_workqueue(fsc->pg_inv_wq); 683 destroy_workqueue(fsc->trunc_wq); 684 685 mempool_destroy(fsc->wb_pagevec_pool); 686 687 destroy_mount_options(fsc->mount_options); 688 689 ceph_destroy_client(fsc->client); 690 691 kfree(fsc); 692 dout("destroy_fs_client %p done\n", fsc); 693 } 694 695 /* 696 * caches 697 */ 698 struct kmem_cache *ceph_inode_cachep; 699 struct kmem_cache *ceph_cap_cachep; 700 struct kmem_cache *ceph_cap_flush_cachep; 701 struct kmem_cache *ceph_dentry_cachep; 702 struct kmem_cache *ceph_file_cachep; 703 struct kmem_cache *ceph_dir_file_cachep; 704 705 static void ceph_inode_init_once(void *foo) 706 { 707 struct ceph_inode_info *ci = foo; 708 inode_init_once(&ci->vfs_inode); 709 } 710 711 static int __init init_caches(void) 712 { 713 int error = -ENOMEM; 714 715 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 716 sizeof(struct ceph_inode_info), 717 __alignof__(struct ceph_inode_info), 718 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 719 SLAB_ACCOUNT, ceph_inode_init_once); 720 if (!ceph_inode_cachep) 721 return -ENOMEM; 722 723 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD); 724 if (!ceph_cap_cachep) 725 goto bad_cap; 726 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 727 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 728 if (!ceph_cap_flush_cachep) 729 goto bad_cap_flush; 730 731 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 732 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 733 if (!ceph_dentry_cachep) 734 goto bad_dentry; 735 736 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 737 if (!ceph_file_cachep) 738 goto bad_file; 739 740 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD); 741 if (!ceph_dir_file_cachep) 742 goto bad_dir_file; 743 744 error = ceph_fscache_register(); 745 if (error) 746 goto bad_fscache; 747 748 return 0; 749 750 bad_fscache: 751 kmem_cache_destroy(ceph_dir_file_cachep); 752 bad_dir_file: 753 kmem_cache_destroy(ceph_file_cachep); 754 bad_file: 755 kmem_cache_destroy(ceph_dentry_cachep); 756 bad_dentry: 757 kmem_cache_destroy(ceph_cap_flush_cachep); 758 bad_cap_flush: 759 kmem_cache_destroy(ceph_cap_cachep); 760 bad_cap: 761 kmem_cache_destroy(ceph_inode_cachep); 762 return error; 763 } 764 765 static void destroy_caches(void) 766 { 767 /* 768 * Make sure all delayed rcu free inodes are flushed before we 769 * destroy cache. 770 */ 771 rcu_barrier(); 772 773 kmem_cache_destroy(ceph_inode_cachep); 774 kmem_cache_destroy(ceph_cap_cachep); 775 kmem_cache_destroy(ceph_cap_flush_cachep); 776 kmem_cache_destroy(ceph_dentry_cachep); 777 kmem_cache_destroy(ceph_file_cachep); 778 kmem_cache_destroy(ceph_dir_file_cachep); 779 780 ceph_fscache_unregister(); 781 } 782 783 784 /* 785 * ceph_umount_begin - initiate forced umount. Tear down down the 786 * mount, skipping steps that may hang while waiting for server(s). 787 */ 788 static void ceph_umount_begin(struct super_block *sb) 789 { 790 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 791 792 dout("ceph_umount_begin - starting forced umount\n"); 793 if (!fsc) 794 return; 795 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 796 ceph_mdsc_force_umount(fsc->mdsc); 797 return; 798 } 799 800 static const struct super_operations ceph_super_ops = { 801 .alloc_inode = ceph_alloc_inode, 802 .destroy_inode = ceph_destroy_inode, 803 .write_inode = ceph_write_inode, 804 .drop_inode = ceph_drop_inode, 805 .sync_fs = ceph_sync_fs, 806 .put_super = ceph_put_super, 807 .show_options = ceph_show_options, 808 .statfs = ceph_statfs, 809 .umount_begin = ceph_umount_begin, 810 }; 811 812 /* 813 * Bootstrap mount by opening the root directory. Note the mount 814 * @started time from caller, and time out if this takes too long. 815 */ 816 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 817 const char *path, 818 unsigned long started) 819 { 820 struct ceph_mds_client *mdsc = fsc->mdsc; 821 struct ceph_mds_request *req = NULL; 822 int err; 823 struct dentry *root; 824 825 /* open dir */ 826 dout("open_root_inode opening '%s'\n", path); 827 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 828 if (IS_ERR(req)) 829 return ERR_CAST(req); 830 req->r_path1 = kstrdup(path, GFP_NOFS); 831 if (!req->r_path1) { 832 root = ERR_PTR(-ENOMEM); 833 goto out; 834 } 835 836 req->r_ino1.ino = CEPH_INO_ROOT; 837 req->r_ino1.snap = CEPH_NOSNAP; 838 req->r_started = started; 839 req->r_timeout = fsc->client->options->mount_timeout; 840 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 841 req->r_num_caps = 2; 842 err = ceph_mdsc_do_request(mdsc, NULL, req); 843 if (err == 0) { 844 struct inode *inode = req->r_target_inode; 845 req->r_target_inode = NULL; 846 dout("open_root_inode success\n"); 847 root = d_make_root(inode); 848 if (!root) { 849 root = ERR_PTR(-ENOMEM); 850 goto out; 851 } 852 dout("open_root_inode success, root dentry is %p\n", root); 853 } else { 854 root = ERR_PTR(err); 855 } 856 out: 857 ceph_mdsc_put_request(req); 858 return root; 859 } 860 861 862 863 864 /* 865 * mount: join the ceph cluster, and open root directory. 866 */ 867 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 868 { 869 int err; 870 unsigned long started = jiffies; /* note the start time */ 871 struct dentry *root; 872 873 dout("mount start %p\n", fsc); 874 mutex_lock(&fsc->client->mount_mutex); 875 876 if (!fsc->sb->s_root) { 877 const char *path; 878 err = __ceph_open_session(fsc->client, started); 879 if (err < 0) 880 goto out; 881 882 /* setup fscache */ 883 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) { 884 err = ceph_fscache_register_fs(fsc); 885 if (err < 0) 886 goto out; 887 } 888 889 if (!fsc->mount_options->server_path) { 890 path = ""; 891 dout("mount opening path \\t\n"); 892 } else { 893 path = fsc->mount_options->server_path + 1; 894 dout("mount opening path %s\n", path); 895 } 896 897 err = ceph_fs_debugfs_init(fsc); 898 if (err < 0) 899 goto out; 900 901 root = open_root_dentry(fsc, path, started); 902 if (IS_ERR(root)) { 903 err = PTR_ERR(root); 904 goto out; 905 } 906 fsc->sb->s_root = dget(root); 907 } else { 908 root = dget(fsc->sb->s_root); 909 } 910 911 fsc->mount_state = CEPH_MOUNT_MOUNTED; 912 dout("mount success\n"); 913 mutex_unlock(&fsc->client->mount_mutex); 914 return root; 915 916 out: 917 mutex_unlock(&fsc->client->mount_mutex); 918 return ERR_PTR(err); 919 } 920 921 static int ceph_set_super(struct super_block *s, void *data) 922 { 923 struct ceph_fs_client *fsc = data; 924 int ret; 925 926 dout("set_super %p data %p\n", s, data); 927 928 s->s_flags = fsc->mount_options->sb_flags; 929 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 930 931 s->s_xattr = ceph_xattr_handlers; 932 s->s_fs_info = fsc; 933 fsc->sb = s; 934 935 s->s_op = &ceph_super_ops; 936 s->s_d_op = &ceph_dentry_ops; 937 s->s_export_op = &ceph_export_ops; 938 939 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 940 941 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 942 if (ret != 0) 943 goto fail; 944 945 return ret; 946 947 fail: 948 s->s_fs_info = NULL; 949 fsc->sb = NULL; 950 return ret; 951 } 952 953 /* 954 * share superblock if same fs AND options 955 */ 956 static int ceph_compare_super(struct super_block *sb, void *data) 957 { 958 struct ceph_fs_client *new = data; 959 struct ceph_mount_options *fsopt = new->mount_options; 960 struct ceph_options *opt = new->client->options; 961 struct ceph_fs_client *other = ceph_sb_to_client(sb); 962 963 dout("ceph_compare_super %p\n", sb); 964 965 if (compare_mount_options(fsopt, opt, other)) { 966 dout("monitor(s)/mount options don't match\n"); 967 return 0; 968 } 969 if ((opt->flags & CEPH_OPT_FSID) && 970 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 971 dout("fsid doesn't match\n"); 972 return 0; 973 } 974 if (fsopt->sb_flags != other->mount_options->sb_flags) { 975 dout("flags differ\n"); 976 return 0; 977 } 978 return 1; 979 } 980 981 /* 982 * construct our own bdi so we can control readahead, etc. 983 */ 984 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 985 986 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc) 987 { 988 int err; 989 990 err = super_setup_bdi_name(sb, "ceph-%ld", 991 atomic_long_inc_return(&bdi_seq)); 992 if (err) 993 return err; 994 995 /* set ra_pages based on rasize mount option? */ 996 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT; 997 998 /* set io_pages based on max osd read size */ 999 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT; 1000 1001 return 0; 1002 } 1003 1004 static struct dentry *ceph_mount(struct file_system_type *fs_type, 1005 int flags, const char *dev_name, void *data) 1006 { 1007 struct super_block *sb; 1008 struct ceph_fs_client *fsc; 1009 struct dentry *res; 1010 int err; 1011 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 1012 struct ceph_mount_options *fsopt = NULL; 1013 struct ceph_options *opt = NULL; 1014 1015 dout("ceph_mount\n"); 1016 1017 #ifdef CONFIG_CEPH_FS_POSIX_ACL 1018 flags |= SB_POSIXACL; 1019 #endif 1020 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 1021 if (err < 0) { 1022 res = ERR_PTR(err); 1023 goto out_final; 1024 } 1025 1026 /* create client (which we may/may not use) */ 1027 fsc = create_fs_client(fsopt, opt); 1028 if (IS_ERR(fsc)) { 1029 res = ERR_CAST(fsc); 1030 destroy_mount_options(fsopt); 1031 ceph_destroy_options(opt); 1032 goto out_final; 1033 } 1034 1035 err = ceph_mdsc_init(fsc); 1036 if (err < 0) { 1037 res = ERR_PTR(err); 1038 goto out; 1039 } 1040 1041 if (ceph_test_opt(fsc->client, NOSHARE)) 1042 compare_super = NULL; 1043 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1044 if (IS_ERR(sb)) { 1045 res = ERR_CAST(sb); 1046 goto out; 1047 } 1048 1049 if (ceph_sb_to_client(sb) != fsc) { 1050 ceph_mdsc_destroy(fsc); 1051 destroy_fs_client(fsc); 1052 fsc = ceph_sb_to_client(sb); 1053 dout("get_sb got existing client %p\n", fsc); 1054 } else { 1055 dout("get_sb using new client %p\n", fsc); 1056 err = ceph_setup_bdi(sb, fsc); 1057 if (err < 0) { 1058 res = ERR_PTR(err); 1059 goto out_splat; 1060 } 1061 } 1062 1063 res = ceph_real_mount(fsc); 1064 if (IS_ERR(res)) 1065 goto out_splat; 1066 dout("root %p inode %p ino %llx.%llx\n", res, 1067 d_inode(res), ceph_vinop(d_inode(res))); 1068 return res; 1069 1070 out_splat: 1071 ceph_mdsc_close_sessions(fsc->mdsc); 1072 deactivate_locked_super(sb); 1073 goto out_final; 1074 1075 out: 1076 ceph_mdsc_destroy(fsc); 1077 destroy_fs_client(fsc); 1078 out_final: 1079 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1080 return res; 1081 } 1082 1083 static void ceph_kill_sb(struct super_block *s) 1084 { 1085 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1086 dev_t dev = s->s_dev; 1087 1088 dout("kill_sb %p\n", s); 1089 1090 ceph_mdsc_pre_umount(fsc->mdsc); 1091 generic_shutdown_super(s); 1092 1093 fsc->client->extra_mon_dispatch = NULL; 1094 ceph_fs_debugfs_cleanup(fsc); 1095 1096 ceph_fscache_unregister_fs(fsc); 1097 1098 ceph_mdsc_destroy(fsc); 1099 1100 destroy_fs_client(fsc); 1101 free_anon_bdev(dev); 1102 } 1103 1104 static struct file_system_type ceph_fs_type = { 1105 .owner = THIS_MODULE, 1106 .name = "ceph", 1107 .mount = ceph_mount, 1108 .kill_sb = ceph_kill_sb, 1109 .fs_flags = FS_RENAME_DOES_D_MOVE, 1110 }; 1111 MODULE_ALIAS_FS("ceph"); 1112 1113 static int __init init_ceph(void) 1114 { 1115 int ret = init_caches(); 1116 if (ret) 1117 goto out; 1118 1119 ceph_flock_init(); 1120 ceph_xattr_init(); 1121 ret = register_filesystem(&ceph_fs_type); 1122 if (ret) 1123 goto out_xattr; 1124 1125 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1126 1127 return 0; 1128 1129 out_xattr: 1130 ceph_xattr_exit(); 1131 destroy_caches(); 1132 out: 1133 return ret; 1134 } 1135 1136 static void __exit exit_ceph(void) 1137 { 1138 dout("exit_ceph\n"); 1139 unregister_filesystem(&ceph_fs_type); 1140 ceph_xattr_exit(); 1141 destroy_caches(); 1142 } 1143 1144 module_init(init_ceph); 1145 module_exit(exit_ceph); 1146 1147 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1148 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1149 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1150 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1151 MODULE_LICENSE("GPL"); 1152