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_fscache_uniq, 125 Opt_last_string, 126 /* string args above */ 127 Opt_dirstat, 128 Opt_nodirstat, 129 Opt_rbytes, 130 Opt_norbytes, 131 Opt_asyncreaddir, 132 Opt_noasyncreaddir, 133 Opt_dcache, 134 Opt_nodcache, 135 Opt_ino32, 136 Opt_noino32, 137 Opt_fscache, 138 Opt_nofscache, 139 Opt_poolperm, 140 Opt_nopoolperm, 141 Opt_require_active_mds, 142 Opt_norequire_active_mds, 143 #ifdef CONFIG_CEPH_FS_POSIX_ACL 144 Opt_acl, 145 #endif 146 Opt_noacl, 147 }; 148 149 static match_table_t fsopt_tokens = { 150 {Opt_wsize, "wsize=%d"}, 151 {Opt_rsize, "rsize=%d"}, 152 {Opt_rasize, "rasize=%d"}, 153 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 154 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 155 {Opt_cap_release_safety, "cap_release_safety=%d"}, 156 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 157 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 158 {Opt_congestion_kb, "write_congestion_kb=%d"}, 159 /* int args above */ 160 {Opt_snapdirname, "snapdirname=%s"}, 161 {Opt_mds_namespace, "mds_namespace=%s"}, 162 {Opt_fscache_uniq, "fsc=%s"}, 163 /* string args above */ 164 {Opt_dirstat, "dirstat"}, 165 {Opt_nodirstat, "nodirstat"}, 166 {Opt_rbytes, "rbytes"}, 167 {Opt_norbytes, "norbytes"}, 168 {Opt_asyncreaddir, "asyncreaddir"}, 169 {Opt_noasyncreaddir, "noasyncreaddir"}, 170 {Opt_dcache, "dcache"}, 171 {Opt_nodcache, "nodcache"}, 172 {Opt_ino32, "ino32"}, 173 {Opt_noino32, "noino32"}, 174 {Opt_fscache, "fsc"}, 175 {Opt_nofscache, "nofsc"}, 176 {Opt_poolperm, "poolperm"}, 177 {Opt_nopoolperm, "nopoolperm"}, 178 {Opt_require_active_mds, "require_active_mds"}, 179 {Opt_norequire_active_mds, "norequire_active_mds"}, 180 #ifdef CONFIG_CEPH_FS_POSIX_ACL 181 {Opt_acl, "acl"}, 182 #endif 183 {Opt_noacl, "noacl"}, 184 {-1, NULL} 185 }; 186 187 static int parse_fsopt_token(char *c, void *private) 188 { 189 struct ceph_mount_options *fsopt = private; 190 substring_t argstr[MAX_OPT_ARGS]; 191 int token, intval, ret; 192 193 token = match_token((char *)c, fsopt_tokens, argstr); 194 if (token < 0) 195 return -EINVAL; 196 197 if (token < Opt_last_int) { 198 ret = match_int(&argstr[0], &intval); 199 if (ret < 0) { 200 pr_err("bad mount option arg (not int) " 201 "at '%s'\n", c); 202 return ret; 203 } 204 dout("got int token %d val %d\n", token, intval); 205 } else if (token > Opt_last_int && token < Opt_last_string) { 206 dout("got string token %d val %s\n", token, 207 argstr[0].from); 208 } else { 209 dout("got token %d\n", token); 210 } 211 212 switch (token) { 213 case Opt_snapdirname: 214 kfree(fsopt->snapdir_name); 215 fsopt->snapdir_name = kstrndup(argstr[0].from, 216 argstr[0].to-argstr[0].from, 217 GFP_KERNEL); 218 if (!fsopt->snapdir_name) 219 return -ENOMEM; 220 break; 221 case Opt_mds_namespace: 222 fsopt->mds_namespace = kstrndup(argstr[0].from, 223 argstr[0].to-argstr[0].from, 224 GFP_KERNEL); 225 if (!fsopt->mds_namespace) 226 return -ENOMEM; 227 break; 228 case Opt_fscache_uniq: 229 fsopt->fscache_uniq = kstrndup(argstr[0].from, 230 argstr[0].to-argstr[0].from, 231 GFP_KERNEL); 232 if (!fsopt->fscache_uniq) 233 return -ENOMEM; 234 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 235 break; 236 /* misc */ 237 case Opt_wsize: 238 fsopt->wsize = intval; 239 break; 240 case Opt_rsize: 241 fsopt->rsize = intval; 242 break; 243 case Opt_rasize: 244 fsopt->rasize = intval; 245 break; 246 case Opt_caps_wanted_delay_min: 247 fsopt->caps_wanted_delay_min = intval; 248 break; 249 case Opt_caps_wanted_delay_max: 250 fsopt->caps_wanted_delay_max = intval; 251 break; 252 case Opt_readdir_max_entries: 253 fsopt->max_readdir = intval; 254 break; 255 case Opt_readdir_max_bytes: 256 fsopt->max_readdir_bytes = intval; 257 break; 258 case Opt_congestion_kb: 259 fsopt->congestion_kb = intval; 260 break; 261 case Opt_dirstat: 262 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 263 break; 264 case Opt_nodirstat: 265 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 266 break; 267 case Opt_rbytes: 268 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 269 break; 270 case Opt_norbytes: 271 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 272 break; 273 case Opt_asyncreaddir: 274 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 275 break; 276 case Opt_noasyncreaddir: 277 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 278 break; 279 case Opt_dcache: 280 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 281 break; 282 case Opt_nodcache: 283 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 284 break; 285 case Opt_ino32: 286 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 287 break; 288 case Opt_noino32: 289 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 290 break; 291 case Opt_fscache: 292 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 293 break; 294 case Opt_nofscache: 295 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 296 break; 297 case Opt_poolperm: 298 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 299 printk ("pool perm"); 300 break; 301 case Opt_nopoolperm: 302 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 303 break; 304 case Opt_require_active_mds: 305 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT; 306 break; 307 case Opt_norequire_active_mds: 308 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT; 309 break; 310 #ifdef CONFIG_CEPH_FS_POSIX_ACL 311 case Opt_acl: 312 fsopt->sb_flags |= MS_POSIXACL; 313 break; 314 #endif 315 case Opt_noacl: 316 fsopt->sb_flags &= ~MS_POSIXACL; 317 break; 318 default: 319 BUG_ON(token); 320 } 321 return 0; 322 } 323 324 static void destroy_mount_options(struct ceph_mount_options *args) 325 { 326 dout("destroy_mount_options %p\n", args); 327 kfree(args->snapdir_name); 328 kfree(args->mds_namespace); 329 kfree(args->server_path); 330 kfree(args->fscache_uniq); 331 kfree(args); 332 } 333 334 static int strcmp_null(const char *s1, const char *s2) 335 { 336 if (!s1 && !s2) 337 return 0; 338 if (s1 && !s2) 339 return -1; 340 if (!s1 && s2) 341 return 1; 342 return strcmp(s1, s2); 343 } 344 345 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 346 struct ceph_options *new_opt, 347 struct ceph_fs_client *fsc) 348 { 349 struct ceph_mount_options *fsopt1 = new_fsopt; 350 struct ceph_mount_options *fsopt2 = fsc->mount_options; 351 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 352 int ret; 353 354 ret = memcmp(fsopt1, fsopt2, ofs); 355 if (ret) 356 return ret; 357 358 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 359 if (ret) 360 return ret; 361 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); 362 if (ret) 363 return ret; 364 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 365 if (ret) 366 return ret; 367 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq); 368 if (ret) 369 return ret; 370 371 return ceph_compare_options(new_opt, fsc->client); 372 } 373 374 static int parse_mount_options(struct ceph_mount_options **pfsopt, 375 struct ceph_options **popt, 376 int flags, char *options, 377 const char *dev_name) 378 { 379 struct ceph_mount_options *fsopt; 380 const char *dev_name_end; 381 int err; 382 383 if (!dev_name || !*dev_name) 384 return -EINVAL; 385 386 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 387 if (!fsopt) 388 return -ENOMEM; 389 390 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 391 392 fsopt->sb_flags = flags; 393 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 394 395 fsopt->rsize = CEPH_RSIZE_DEFAULT; 396 fsopt->rasize = CEPH_RASIZE_DEFAULT; 397 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 398 if (!fsopt->snapdir_name) { 399 err = -ENOMEM; 400 goto out; 401 } 402 403 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 404 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 405 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 406 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 407 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 408 fsopt->congestion_kb = default_congestion_kb(); 409 410 /* 411 * Distinguish the server list from the path in "dev_name". 412 * Internally we do not include the leading '/' in the path. 413 * 414 * "dev_name" will look like: 415 * <server_spec>[,<server_spec>...]:[<path>] 416 * where 417 * <server_spec> is <ip>[:<port>] 418 * <path> is optional, but if present must begin with '/' 419 */ 420 dev_name_end = strchr(dev_name, '/'); 421 if (dev_name_end) { 422 if (strlen(dev_name_end) > 1) { 423 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 424 if (!fsopt->server_path) { 425 err = -ENOMEM; 426 goto out; 427 } 428 } 429 } else { 430 dev_name_end = dev_name + strlen(dev_name); 431 } 432 err = -EINVAL; 433 dev_name_end--; /* back up to ':' separator */ 434 if (dev_name_end < dev_name || *dev_name_end != ':') { 435 pr_err("device name is missing path (no : separator in %s)\n", 436 dev_name); 437 goto out; 438 } 439 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 440 if (fsopt->server_path) 441 dout("server path '%s'\n", fsopt->server_path); 442 443 *popt = ceph_parse_options(options, dev_name, dev_name_end, 444 parse_fsopt_token, (void *)fsopt); 445 if (IS_ERR(*popt)) { 446 err = PTR_ERR(*popt); 447 goto out; 448 } 449 450 /* success */ 451 *pfsopt = fsopt; 452 return 0; 453 454 out: 455 destroy_mount_options(fsopt); 456 return err; 457 } 458 459 /** 460 * ceph_show_options - Show mount options in /proc/mounts 461 * @m: seq_file to write to 462 * @root: root of that (sub)tree 463 */ 464 static int ceph_show_options(struct seq_file *m, struct dentry *root) 465 { 466 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 467 struct ceph_mount_options *fsopt = fsc->mount_options; 468 size_t pos; 469 int ret; 470 471 /* a comma between MNT/MS and client options */ 472 seq_putc(m, ','); 473 pos = m->count; 474 475 ret = ceph_print_client_options(m, fsc->client); 476 if (ret) 477 return ret; 478 479 /* retract our comma if no client options */ 480 if (m->count == pos) 481 m->count--; 482 483 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 484 seq_puts(m, ",dirstat"); 485 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 486 seq_puts(m, ",rbytes"); 487 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 488 seq_puts(m, ",noasyncreaddir"); 489 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 490 seq_puts(m, ",nodcache"); 491 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) { 492 if (fsopt->fscache_uniq) 493 seq_printf(m, ",fsc=%s", fsopt->fscache_uniq); 494 else 495 seq_puts(m, ",fsc"); 496 } 497 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 498 seq_puts(m, ",nopoolperm"); 499 500 #ifdef CONFIG_CEPH_FS_POSIX_ACL 501 if (fsopt->sb_flags & MS_POSIXACL) 502 seq_puts(m, ",acl"); 503 else 504 seq_puts(m, ",noacl"); 505 #endif 506 507 if (fsopt->mds_namespace) 508 seq_printf(m, ",mds_namespace=%s", fsopt->mds_namespace); 509 if (fsopt->wsize) 510 seq_printf(m, ",wsize=%d", fsopt->wsize); 511 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 512 seq_printf(m, ",rsize=%d", fsopt->rsize); 513 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 514 seq_printf(m, ",rasize=%d", fsopt->rasize); 515 if (fsopt->congestion_kb != default_congestion_kb()) 516 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 517 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 518 seq_printf(m, ",caps_wanted_delay_min=%d", 519 fsopt->caps_wanted_delay_min); 520 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 521 seq_printf(m, ",caps_wanted_delay_max=%d", 522 fsopt->caps_wanted_delay_max); 523 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 524 seq_printf(m, ",cap_release_safety=%d", 525 fsopt->cap_release_safety); 526 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 527 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 528 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 529 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 530 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 531 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 532 533 return 0; 534 } 535 536 /* 537 * handle any mon messages the standard library doesn't understand. 538 * return error if we don't either. 539 */ 540 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 541 { 542 struct ceph_fs_client *fsc = client->private; 543 int type = le16_to_cpu(msg->hdr.type); 544 545 switch (type) { 546 case CEPH_MSG_MDS_MAP: 547 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 548 return 0; 549 case CEPH_MSG_FS_MAP_USER: 550 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 551 return 0; 552 default: 553 return -1; 554 } 555 } 556 557 /* 558 * create a new fs client 559 */ 560 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 561 struct ceph_options *opt) 562 { 563 struct ceph_fs_client *fsc; 564 int page_count; 565 size_t size; 566 int err = -ENOMEM; 567 568 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 569 if (!fsc) 570 return ERR_PTR(-ENOMEM); 571 572 fsc->client = ceph_create_client(opt, fsc); 573 if (IS_ERR(fsc->client)) { 574 err = PTR_ERR(fsc->client); 575 goto fail; 576 } 577 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 578 579 if (fsopt->mds_namespace == NULL) { 580 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 581 0, true); 582 } else { 583 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 584 0, false); 585 } 586 587 fsc->mount_options = fsopt; 588 589 fsc->sb = NULL; 590 fsc->mount_state = CEPH_MOUNT_MOUNTING; 591 592 atomic_long_set(&fsc->writeback_count, 0); 593 594 err = -ENOMEM; 595 /* 596 * The number of concurrent works can be high but they don't need 597 * to be processed in parallel, limit concurrency. 598 */ 599 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 600 if (fsc->wb_wq == NULL) 601 goto fail_client; 602 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 603 if (fsc->pg_inv_wq == NULL) 604 goto fail_wb_wq; 605 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 606 if (fsc->trunc_wq == NULL) 607 goto fail_pg_inv_wq; 608 609 /* set up mempools */ 610 err = -ENOMEM; 611 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 612 size = sizeof (struct page *) * (page_count ? page_count : 1); 613 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 614 if (!fsc->wb_pagevec_pool) 615 goto fail_trunc_wq; 616 617 /* caps */ 618 fsc->min_caps = fsopt->max_readdir; 619 620 return fsc; 621 622 fail_trunc_wq: 623 destroy_workqueue(fsc->trunc_wq); 624 fail_pg_inv_wq: 625 destroy_workqueue(fsc->pg_inv_wq); 626 fail_wb_wq: 627 destroy_workqueue(fsc->wb_wq); 628 fail_client: 629 ceph_destroy_client(fsc->client); 630 fail: 631 kfree(fsc); 632 return ERR_PTR(err); 633 } 634 635 static void destroy_fs_client(struct ceph_fs_client *fsc) 636 { 637 dout("destroy_fs_client %p\n", fsc); 638 639 destroy_workqueue(fsc->wb_wq); 640 destroy_workqueue(fsc->pg_inv_wq); 641 destroy_workqueue(fsc->trunc_wq); 642 643 mempool_destroy(fsc->wb_pagevec_pool); 644 645 destroy_mount_options(fsc->mount_options); 646 647 ceph_destroy_client(fsc->client); 648 649 kfree(fsc); 650 dout("destroy_fs_client %p done\n", fsc); 651 } 652 653 /* 654 * caches 655 */ 656 struct kmem_cache *ceph_inode_cachep; 657 struct kmem_cache *ceph_cap_cachep; 658 struct kmem_cache *ceph_cap_flush_cachep; 659 struct kmem_cache *ceph_dentry_cachep; 660 struct kmem_cache *ceph_file_cachep; 661 662 static void ceph_inode_init_once(void *foo) 663 { 664 struct ceph_inode_info *ci = foo; 665 inode_init_once(&ci->vfs_inode); 666 } 667 668 static int __init init_caches(void) 669 { 670 int error = -ENOMEM; 671 672 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 673 sizeof(struct ceph_inode_info), 674 __alignof__(struct ceph_inode_info), 675 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 676 SLAB_ACCOUNT, ceph_inode_init_once); 677 if (ceph_inode_cachep == NULL) 678 return -ENOMEM; 679 680 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 681 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 682 if (ceph_cap_cachep == NULL) 683 goto bad_cap; 684 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 685 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 686 if (ceph_cap_flush_cachep == NULL) 687 goto bad_cap_flush; 688 689 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 690 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 691 if (ceph_dentry_cachep == NULL) 692 goto bad_dentry; 693 694 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 695 696 if (ceph_file_cachep == NULL) 697 goto bad_file; 698 699 if ((error = ceph_fscache_register())) 700 goto bad_file; 701 702 return 0; 703 bad_file: 704 kmem_cache_destroy(ceph_dentry_cachep); 705 bad_dentry: 706 kmem_cache_destroy(ceph_cap_flush_cachep); 707 bad_cap_flush: 708 kmem_cache_destroy(ceph_cap_cachep); 709 bad_cap: 710 kmem_cache_destroy(ceph_inode_cachep); 711 return error; 712 } 713 714 static void destroy_caches(void) 715 { 716 /* 717 * Make sure all delayed rcu free inodes are flushed before we 718 * destroy cache. 719 */ 720 rcu_barrier(); 721 722 kmem_cache_destroy(ceph_inode_cachep); 723 kmem_cache_destroy(ceph_cap_cachep); 724 kmem_cache_destroy(ceph_cap_flush_cachep); 725 kmem_cache_destroy(ceph_dentry_cachep); 726 kmem_cache_destroy(ceph_file_cachep); 727 728 ceph_fscache_unregister(); 729 } 730 731 732 /* 733 * ceph_umount_begin - initiate forced umount. Tear down down the 734 * mount, skipping steps that may hang while waiting for server(s). 735 */ 736 static void ceph_umount_begin(struct super_block *sb) 737 { 738 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 739 740 dout("ceph_umount_begin - starting forced umount\n"); 741 if (!fsc) 742 return; 743 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 744 ceph_mdsc_force_umount(fsc->mdsc); 745 return; 746 } 747 748 static const struct super_operations ceph_super_ops = { 749 .alloc_inode = ceph_alloc_inode, 750 .destroy_inode = ceph_destroy_inode, 751 .write_inode = ceph_write_inode, 752 .drop_inode = ceph_drop_inode, 753 .sync_fs = ceph_sync_fs, 754 .put_super = ceph_put_super, 755 .show_options = ceph_show_options, 756 .statfs = ceph_statfs, 757 .umount_begin = ceph_umount_begin, 758 }; 759 760 /* 761 * Bootstrap mount by opening the root directory. Note the mount 762 * @started time from caller, and time out if this takes too long. 763 */ 764 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 765 const char *path, 766 unsigned long started) 767 { 768 struct ceph_mds_client *mdsc = fsc->mdsc; 769 struct ceph_mds_request *req = NULL; 770 int err; 771 struct dentry *root; 772 773 /* open dir */ 774 dout("open_root_inode opening '%s'\n", path); 775 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 776 if (IS_ERR(req)) 777 return ERR_CAST(req); 778 req->r_path1 = kstrdup(path, GFP_NOFS); 779 if (!req->r_path1) { 780 root = ERR_PTR(-ENOMEM); 781 goto out; 782 } 783 784 req->r_ino1.ino = CEPH_INO_ROOT; 785 req->r_ino1.snap = CEPH_NOSNAP; 786 req->r_started = started; 787 req->r_timeout = fsc->client->options->mount_timeout; 788 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 789 req->r_num_caps = 2; 790 err = ceph_mdsc_do_request(mdsc, NULL, req); 791 if (err == 0) { 792 struct inode *inode = req->r_target_inode; 793 req->r_target_inode = NULL; 794 dout("open_root_inode success\n"); 795 root = d_make_root(inode); 796 if (!root) { 797 root = ERR_PTR(-ENOMEM); 798 goto out; 799 } 800 dout("open_root_inode success, root dentry is %p\n", root); 801 } else { 802 root = ERR_PTR(err); 803 } 804 out: 805 ceph_mdsc_put_request(req); 806 return root; 807 } 808 809 810 811 812 /* 813 * mount: join the ceph cluster, and open root directory. 814 */ 815 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 816 { 817 int err; 818 unsigned long started = jiffies; /* note the start time */ 819 struct dentry *root; 820 int first = 0; /* first vfsmount for this super_block */ 821 822 dout("mount start %p\n", fsc); 823 mutex_lock(&fsc->client->mount_mutex); 824 825 if (!fsc->sb->s_root) { 826 const char *path; 827 err = __ceph_open_session(fsc->client, started); 828 if (err < 0) 829 goto out; 830 831 /* setup fscache */ 832 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) { 833 err = ceph_fscache_register_fs(fsc); 834 if (err < 0) 835 goto out; 836 } 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_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc) 941 { 942 int err; 943 944 err = super_setup_bdi_name(sb, "ceph-%ld", 945 atomic_long_inc_return(&bdi_seq)); 946 if (err) 947 return err; 948 949 /* set ra_pages based on rasize mount option? */ 950 if (fsc->mount_options->rasize >= PAGE_SIZE) 951 sb->s_bdi->ra_pages = 952 (fsc->mount_options->rasize + PAGE_SIZE - 1) 953 >> PAGE_SHIFT; 954 else 955 sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE; 956 957 if (fsc->mount_options->rsize > fsc->mount_options->rasize && 958 fsc->mount_options->rsize >= PAGE_SIZE) 959 sb->s_bdi->io_pages = 960 (fsc->mount_options->rsize + PAGE_SIZE - 1) 961 >> PAGE_SHIFT; 962 else if (fsc->mount_options->rsize == 0) 963 sb->s_bdi->io_pages = ULONG_MAX; 964 965 return 0; 966 } 967 968 static struct dentry *ceph_mount(struct file_system_type *fs_type, 969 int flags, const char *dev_name, void *data) 970 { 971 struct super_block *sb; 972 struct ceph_fs_client *fsc; 973 struct dentry *res; 974 int err; 975 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 976 struct ceph_mount_options *fsopt = NULL; 977 struct ceph_options *opt = NULL; 978 979 dout("ceph_mount\n"); 980 981 #ifdef CONFIG_CEPH_FS_POSIX_ACL 982 flags |= MS_POSIXACL; 983 #endif 984 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 985 if (err < 0) { 986 res = ERR_PTR(err); 987 goto out_final; 988 } 989 990 /* create client (which we may/may not use) */ 991 fsc = create_fs_client(fsopt, opt); 992 if (IS_ERR(fsc)) { 993 res = ERR_CAST(fsc); 994 destroy_mount_options(fsopt); 995 ceph_destroy_options(opt); 996 goto out_final; 997 } 998 999 err = ceph_mdsc_init(fsc); 1000 if (err < 0) { 1001 res = ERR_PTR(err); 1002 goto out; 1003 } 1004 1005 if (ceph_test_opt(fsc->client, NOSHARE)) 1006 compare_super = NULL; 1007 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1008 if (IS_ERR(sb)) { 1009 res = ERR_CAST(sb); 1010 goto out; 1011 } 1012 1013 if (ceph_sb_to_client(sb) != fsc) { 1014 ceph_mdsc_destroy(fsc); 1015 destroy_fs_client(fsc); 1016 fsc = ceph_sb_to_client(sb); 1017 dout("get_sb got existing client %p\n", fsc); 1018 } else { 1019 dout("get_sb using new client %p\n", fsc); 1020 err = ceph_setup_bdi(sb, fsc); 1021 if (err < 0) { 1022 res = ERR_PTR(err); 1023 goto out_splat; 1024 } 1025 } 1026 1027 res = ceph_real_mount(fsc); 1028 if (IS_ERR(res)) 1029 goto out_splat; 1030 dout("root %p inode %p ino %llx.%llx\n", res, 1031 d_inode(res), ceph_vinop(d_inode(res))); 1032 return res; 1033 1034 out_splat: 1035 ceph_mdsc_close_sessions(fsc->mdsc); 1036 deactivate_locked_super(sb); 1037 goto out_final; 1038 1039 out: 1040 ceph_mdsc_destroy(fsc); 1041 destroy_fs_client(fsc); 1042 out_final: 1043 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1044 return res; 1045 } 1046 1047 static void ceph_kill_sb(struct super_block *s) 1048 { 1049 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1050 dev_t dev = s->s_dev; 1051 1052 dout("kill_sb %p\n", s); 1053 1054 ceph_mdsc_pre_umount(fsc->mdsc); 1055 generic_shutdown_super(s); 1056 1057 fsc->client->extra_mon_dispatch = NULL; 1058 ceph_fs_debugfs_cleanup(fsc); 1059 1060 ceph_fscache_unregister_fs(fsc); 1061 1062 ceph_mdsc_destroy(fsc); 1063 1064 destroy_fs_client(fsc); 1065 free_anon_bdev(dev); 1066 } 1067 1068 static struct file_system_type ceph_fs_type = { 1069 .owner = THIS_MODULE, 1070 .name = "ceph", 1071 .mount = ceph_mount, 1072 .kill_sb = ceph_kill_sb, 1073 .fs_flags = FS_RENAME_DOES_D_MOVE, 1074 }; 1075 MODULE_ALIAS_FS("ceph"); 1076 1077 static int __init init_ceph(void) 1078 { 1079 int ret = init_caches(); 1080 if (ret) 1081 goto out; 1082 1083 ceph_flock_init(); 1084 ceph_xattr_init(); 1085 ret = register_filesystem(&ceph_fs_type); 1086 if (ret) 1087 goto out_xattr; 1088 1089 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1090 1091 return 0; 1092 1093 out_xattr: 1094 ceph_xattr_exit(); 1095 destroy_caches(); 1096 out: 1097 return ret; 1098 } 1099 1100 static void __exit exit_ceph(void) 1101 { 1102 dout("exit_ceph\n"); 1103 unregister_filesystem(&ceph_fs_type); 1104 ceph_xattr_exit(); 1105 destroy_caches(); 1106 } 1107 1108 module_init(init_ceph); 1109 module_exit(exit_ceph); 1110 1111 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1112 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1113 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1114 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1115 MODULE_LICENSE("GPL"); 1116