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_mds_namespace, 112 Opt_wsize, 113 Opt_rsize, 114 Opt_rasize, 115 Opt_caps_wanted_delay_min, 116 Opt_caps_wanted_delay_max, 117 Opt_cap_release_safety, 118 Opt_readdir_max_entries, 119 Opt_readdir_max_bytes, 120 Opt_congestion_kb, 121 Opt_last_int, 122 /* int args above */ 123 Opt_snapdirname, 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_mds_namespace, "mds_namespace=%d"}, 148 {Opt_wsize, "wsize=%d"}, 149 {Opt_rsize, "rsize=%d"}, 150 {Opt_rasize, "rasize=%d"}, 151 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 152 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 153 {Opt_cap_release_safety, "cap_release_safety=%d"}, 154 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 155 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 156 {Opt_congestion_kb, "write_congestion_kb=%d"}, 157 /* int args above */ 158 {Opt_snapdirname, "snapdirname=%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; 215 216 /* misc */ 217 case Opt_mds_namespace: 218 fsopt->mds_namespace = intval; 219 break; 220 case Opt_wsize: 221 fsopt->wsize = intval; 222 break; 223 case Opt_rsize: 224 fsopt->rsize = intval; 225 break; 226 case Opt_rasize: 227 fsopt->rasize = intval; 228 break; 229 case Opt_caps_wanted_delay_min: 230 fsopt->caps_wanted_delay_min = intval; 231 break; 232 case Opt_caps_wanted_delay_max: 233 fsopt->caps_wanted_delay_max = intval; 234 break; 235 case Opt_readdir_max_entries: 236 fsopt->max_readdir = intval; 237 break; 238 case Opt_readdir_max_bytes: 239 fsopt->max_readdir_bytes = intval; 240 break; 241 case Opt_congestion_kb: 242 fsopt->congestion_kb = intval; 243 break; 244 case Opt_dirstat: 245 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 246 break; 247 case Opt_nodirstat: 248 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 249 break; 250 case Opt_rbytes: 251 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 252 break; 253 case Opt_norbytes: 254 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 255 break; 256 case Opt_asyncreaddir: 257 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 258 break; 259 case Opt_noasyncreaddir: 260 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 261 break; 262 case Opt_dcache: 263 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 264 break; 265 case Opt_nodcache: 266 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 267 break; 268 case Opt_ino32: 269 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 270 break; 271 case Opt_noino32: 272 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 273 break; 274 case Opt_fscache: 275 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 276 break; 277 case Opt_nofscache: 278 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 279 break; 280 case Opt_poolperm: 281 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 282 printk ("pool perm"); 283 break; 284 case Opt_nopoolperm: 285 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 286 break; 287 #ifdef CONFIG_CEPH_FS_POSIX_ACL 288 case Opt_acl: 289 fsopt->sb_flags |= MS_POSIXACL; 290 break; 291 #endif 292 case Opt_noacl: 293 fsopt->sb_flags &= ~MS_POSIXACL; 294 break; 295 default: 296 BUG_ON(token); 297 } 298 return 0; 299 } 300 301 static void destroy_mount_options(struct ceph_mount_options *args) 302 { 303 dout("destroy_mount_options %p\n", args); 304 kfree(args->snapdir_name); 305 kfree(args->server_path); 306 kfree(args); 307 } 308 309 static int strcmp_null(const char *s1, const char *s2) 310 { 311 if (!s1 && !s2) 312 return 0; 313 if (s1 && !s2) 314 return -1; 315 if (!s1 && s2) 316 return 1; 317 return strcmp(s1, s2); 318 } 319 320 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 321 struct ceph_options *new_opt, 322 struct ceph_fs_client *fsc) 323 { 324 struct ceph_mount_options *fsopt1 = new_fsopt; 325 struct ceph_mount_options *fsopt2 = fsc->mount_options; 326 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 327 int ret; 328 329 ret = memcmp(fsopt1, fsopt2, ofs); 330 if (ret) 331 return ret; 332 333 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 334 if (ret) 335 return ret; 336 337 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 338 if (ret) 339 return ret; 340 341 return ceph_compare_options(new_opt, fsc->client); 342 } 343 344 static int parse_mount_options(struct ceph_mount_options **pfsopt, 345 struct ceph_options **popt, 346 int flags, char *options, 347 const char *dev_name) 348 { 349 struct ceph_mount_options *fsopt; 350 const char *dev_name_end; 351 int err; 352 353 if (!dev_name || !*dev_name) 354 return -EINVAL; 355 356 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 357 if (!fsopt) 358 return -ENOMEM; 359 360 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 361 362 fsopt->sb_flags = flags; 363 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 364 365 fsopt->rsize = CEPH_RSIZE_DEFAULT; 366 fsopt->rasize = CEPH_RASIZE_DEFAULT; 367 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 368 if (!fsopt->snapdir_name) { 369 err = -ENOMEM; 370 goto out; 371 } 372 373 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 374 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 375 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 376 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 377 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 378 fsopt->congestion_kb = default_congestion_kb(); 379 fsopt->mds_namespace = CEPH_FS_CLUSTER_ID_NONE; 380 381 /* 382 * Distinguish the server list from the path in "dev_name". 383 * Internally we do not include the leading '/' in the path. 384 * 385 * "dev_name" will look like: 386 * <server_spec>[,<server_spec>...]:[<path>] 387 * where 388 * <server_spec> is <ip>[:<port>] 389 * <path> is optional, but if present must begin with '/' 390 */ 391 dev_name_end = strchr(dev_name, '/'); 392 if (dev_name_end) { 393 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 394 if (!fsopt->server_path) { 395 err = -ENOMEM; 396 goto out; 397 } 398 } else { 399 dev_name_end = dev_name + strlen(dev_name); 400 } 401 err = -EINVAL; 402 dev_name_end--; /* back up to ':' separator */ 403 if (dev_name_end < dev_name || *dev_name_end != ':') { 404 pr_err("device name is missing path (no : separator in %s)\n", 405 dev_name); 406 goto out; 407 } 408 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 409 if (fsopt->server_path) 410 dout("server path '%s'\n", fsopt->server_path); 411 412 *popt = ceph_parse_options(options, dev_name, dev_name_end, 413 parse_fsopt_token, (void *)fsopt); 414 if (IS_ERR(*popt)) { 415 err = PTR_ERR(*popt); 416 goto out; 417 } 418 419 /* success */ 420 *pfsopt = fsopt; 421 return 0; 422 423 out: 424 destroy_mount_options(fsopt); 425 return err; 426 } 427 428 /** 429 * ceph_show_options - Show mount options in /proc/mounts 430 * @m: seq_file to write to 431 * @root: root of that (sub)tree 432 */ 433 static int ceph_show_options(struct seq_file *m, struct dentry *root) 434 { 435 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 436 struct ceph_mount_options *fsopt = fsc->mount_options; 437 size_t pos; 438 int ret; 439 440 /* a comma between MNT/MS and client options */ 441 seq_putc(m, ','); 442 pos = m->count; 443 444 ret = ceph_print_client_options(m, fsc->client); 445 if (ret) 446 return ret; 447 448 /* retract our comma if no client options */ 449 if (m->count == pos) 450 m->count--; 451 452 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 453 seq_puts(m, ",dirstat"); 454 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 455 seq_puts(m, ",rbytes"); 456 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 457 seq_puts(m, ",noasyncreaddir"); 458 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 459 seq_puts(m, ",nodcache"); 460 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) 461 seq_puts(m, ",fsc"); 462 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 463 seq_puts(m, ",nopoolperm"); 464 465 #ifdef CONFIG_CEPH_FS_POSIX_ACL 466 if (fsopt->sb_flags & MS_POSIXACL) 467 seq_puts(m, ",acl"); 468 else 469 seq_puts(m, ",noacl"); 470 #endif 471 472 if (fsopt->mds_namespace != CEPH_FS_CLUSTER_ID_NONE) 473 seq_printf(m, ",mds_namespace=%d", fsopt->mds_namespace); 474 if (fsopt->wsize) 475 seq_printf(m, ",wsize=%d", fsopt->wsize); 476 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 477 seq_printf(m, ",rsize=%d", fsopt->rsize); 478 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 479 seq_printf(m, ",rasize=%d", fsopt->rasize); 480 if (fsopt->congestion_kb != default_congestion_kb()) 481 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 482 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 483 seq_printf(m, ",caps_wanted_delay_min=%d", 484 fsopt->caps_wanted_delay_min); 485 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 486 seq_printf(m, ",caps_wanted_delay_max=%d", 487 fsopt->caps_wanted_delay_max); 488 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 489 seq_printf(m, ",cap_release_safety=%d", 490 fsopt->cap_release_safety); 491 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 492 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 493 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 494 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 495 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 496 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 497 498 return 0; 499 } 500 501 /* 502 * handle any mon messages the standard library doesn't understand. 503 * return error if we don't either. 504 */ 505 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 506 { 507 struct ceph_fs_client *fsc = client->private; 508 int type = le16_to_cpu(msg->hdr.type); 509 510 switch (type) { 511 case CEPH_MSG_MDS_MAP: 512 ceph_mdsc_handle_map(fsc->mdsc, msg); 513 return 0; 514 515 default: 516 return -1; 517 } 518 } 519 520 /* 521 * create a new fs client 522 */ 523 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 524 struct ceph_options *opt) 525 { 526 struct ceph_fs_client *fsc; 527 const u64 supported_features = 528 CEPH_FEATURE_FLOCK | CEPH_FEATURE_DIRLAYOUTHASH | 529 CEPH_FEATURE_MDSENC | CEPH_FEATURE_MDS_INLINE_DATA; 530 const u64 required_features = 0; 531 int page_count; 532 size_t size; 533 int err = -ENOMEM; 534 535 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 536 if (!fsc) 537 return ERR_PTR(-ENOMEM); 538 539 fsc->client = ceph_create_client(opt, fsc, supported_features, 540 required_features); 541 if (IS_ERR(fsc->client)) { 542 err = PTR_ERR(fsc->client); 543 goto fail; 544 } 545 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 546 fsc->client->monc.fs_cluster_id = fsopt->mds_namespace; 547 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 0, true); 548 549 fsc->mount_options = fsopt; 550 551 fsc->sb = NULL; 552 fsc->mount_state = CEPH_MOUNT_MOUNTING; 553 554 atomic_long_set(&fsc->writeback_count, 0); 555 556 err = bdi_init(&fsc->backing_dev_info); 557 if (err < 0) 558 goto fail_client; 559 560 err = -ENOMEM; 561 /* 562 * The number of concurrent works can be high but they don't need 563 * to be processed in parallel, limit concurrency. 564 */ 565 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 566 if (fsc->wb_wq == NULL) 567 goto fail_bdi; 568 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 569 if (fsc->pg_inv_wq == NULL) 570 goto fail_wb_wq; 571 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 572 if (fsc->trunc_wq == NULL) 573 goto fail_pg_inv_wq; 574 575 /* set up mempools */ 576 err = -ENOMEM; 577 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 578 size = sizeof (struct page *) * (page_count ? page_count : 1); 579 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 580 if (!fsc->wb_pagevec_pool) 581 goto fail_trunc_wq; 582 583 /* setup fscache */ 584 if ((fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) && 585 (ceph_fscache_register_fs(fsc) != 0)) 586 goto fail_fscache; 587 588 /* caps */ 589 fsc->min_caps = fsopt->max_readdir; 590 591 return fsc; 592 593 fail_fscache: 594 ceph_fscache_unregister_fs(fsc); 595 fail_trunc_wq: 596 destroy_workqueue(fsc->trunc_wq); 597 fail_pg_inv_wq: 598 destroy_workqueue(fsc->pg_inv_wq); 599 fail_wb_wq: 600 destroy_workqueue(fsc->wb_wq); 601 fail_bdi: 602 bdi_destroy(&fsc->backing_dev_info); 603 fail_client: 604 ceph_destroy_client(fsc->client); 605 fail: 606 kfree(fsc); 607 return ERR_PTR(err); 608 } 609 610 static void destroy_fs_client(struct ceph_fs_client *fsc) 611 { 612 dout("destroy_fs_client %p\n", fsc); 613 614 ceph_fscache_unregister_fs(fsc); 615 616 destroy_workqueue(fsc->wb_wq); 617 destroy_workqueue(fsc->pg_inv_wq); 618 destroy_workqueue(fsc->trunc_wq); 619 620 bdi_destroy(&fsc->backing_dev_info); 621 622 mempool_destroy(fsc->wb_pagevec_pool); 623 624 destroy_mount_options(fsc->mount_options); 625 626 ceph_fs_debugfs_cleanup(fsc); 627 628 ceph_destroy_client(fsc->client); 629 630 kfree(fsc); 631 dout("destroy_fs_client %p done\n", fsc); 632 } 633 634 /* 635 * caches 636 */ 637 struct kmem_cache *ceph_inode_cachep; 638 struct kmem_cache *ceph_cap_cachep; 639 struct kmem_cache *ceph_cap_flush_cachep; 640 struct kmem_cache *ceph_dentry_cachep; 641 struct kmem_cache *ceph_file_cachep; 642 643 static void ceph_inode_init_once(void *foo) 644 { 645 struct ceph_inode_info *ci = foo; 646 inode_init_once(&ci->vfs_inode); 647 } 648 649 static int __init init_caches(void) 650 { 651 int error = -ENOMEM; 652 653 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 654 sizeof(struct ceph_inode_info), 655 __alignof__(struct ceph_inode_info), 656 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 657 SLAB_ACCOUNT, ceph_inode_init_once); 658 if (ceph_inode_cachep == NULL) 659 return -ENOMEM; 660 661 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 662 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 663 if (ceph_cap_cachep == NULL) 664 goto bad_cap; 665 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 666 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 667 if (ceph_cap_flush_cachep == NULL) 668 goto bad_cap_flush; 669 670 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 671 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 672 if (ceph_dentry_cachep == NULL) 673 goto bad_dentry; 674 675 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 676 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 677 if (ceph_file_cachep == NULL) 678 goto bad_file; 679 680 if ((error = ceph_fscache_register())) 681 goto bad_file; 682 683 return 0; 684 bad_file: 685 kmem_cache_destroy(ceph_dentry_cachep); 686 bad_dentry: 687 kmem_cache_destroy(ceph_cap_flush_cachep); 688 bad_cap_flush: 689 kmem_cache_destroy(ceph_cap_cachep); 690 bad_cap: 691 kmem_cache_destroy(ceph_inode_cachep); 692 return error; 693 } 694 695 static void destroy_caches(void) 696 { 697 /* 698 * Make sure all delayed rcu free inodes are flushed before we 699 * destroy cache. 700 */ 701 rcu_barrier(); 702 703 kmem_cache_destroy(ceph_inode_cachep); 704 kmem_cache_destroy(ceph_cap_cachep); 705 kmem_cache_destroy(ceph_cap_flush_cachep); 706 kmem_cache_destroy(ceph_dentry_cachep); 707 kmem_cache_destroy(ceph_file_cachep); 708 709 ceph_fscache_unregister(); 710 } 711 712 713 /* 714 * ceph_umount_begin - initiate forced umount. Tear down down the 715 * mount, skipping steps that may hang while waiting for server(s). 716 */ 717 static void ceph_umount_begin(struct super_block *sb) 718 { 719 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 720 721 dout("ceph_umount_begin - starting forced umount\n"); 722 if (!fsc) 723 return; 724 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 725 ceph_mdsc_force_umount(fsc->mdsc); 726 return; 727 } 728 729 static const struct super_operations ceph_super_ops = { 730 .alloc_inode = ceph_alloc_inode, 731 .destroy_inode = ceph_destroy_inode, 732 .write_inode = ceph_write_inode, 733 .drop_inode = ceph_drop_inode, 734 .sync_fs = ceph_sync_fs, 735 .put_super = ceph_put_super, 736 .show_options = ceph_show_options, 737 .statfs = ceph_statfs, 738 .umount_begin = ceph_umount_begin, 739 }; 740 741 /* 742 * Bootstrap mount by opening the root directory. Note the mount 743 * @started time from caller, and time out if this takes too long. 744 */ 745 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 746 const char *path, 747 unsigned long started) 748 { 749 struct ceph_mds_client *mdsc = fsc->mdsc; 750 struct ceph_mds_request *req = NULL; 751 int err; 752 struct dentry *root; 753 754 /* open dir */ 755 dout("open_root_inode opening '%s'\n", path); 756 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 757 if (IS_ERR(req)) 758 return ERR_CAST(req); 759 req->r_path1 = kstrdup(path, GFP_NOFS); 760 if (!req->r_path1) { 761 root = ERR_PTR(-ENOMEM); 762 goto out; 763 } 764 765 req->r_ino1.ino = CEPH_INO_ROOT; 766 req->r_ino1.snap = CEPH_NOSNAP; 767 req->r_started = started; 768 req->r_timeout = fsc->client->options->mount_timeout; 769 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 770 req->r_num_caps = 2; 771 err = ceph_mdsc_do_request(mdsc, NULL, req); 772 if (err == 0) { 773 struct inode *inode = req->r_target_inode; 774 req->r_target_inode = NULL; 775 dout("open_root_inode success\n"); 776 if (ceph_ino(inode) == CEPH_INO_ROOT && 777 fsc->sb->s_root == NULL) { 778 root = d_make_root(inode); 779 if (!root) { 780 root = ERR_PTR(-ENOMEM); 781 goto out; 782 } 783 } else { 784 root = d_obtain_root(inode); 785 } 786 ceph_init_dentry(root); 787 dout("open_root_inode success, root dentry is %p\n", root); 788 } else { 789 root = ERR_PTR(err); 790 } 791 out: 792 ceph_mdsc_put_request(req); 793 return root; 794 } 795 796 797 798 799 /* 800 * mount: join the ceph cluster, and open root directory. 801 */ 802 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 803 { 804 int err; 805 unsigned long started = jiffies; /* note the start time */ 806 struct dentry *root; 807 int first = 0; /* first vfsmount for this super_block */ 808 809 dout("mount start %p\n", fsc); 810 mutex_lock(&fsc->client->mount_mutex); 811 812 if (!fsc->sb->s_root) { 813 err = __ceph_open_session(fsc->client, started); 814 if (err < 0) 815 goto out; 816 817 dout("mount opening root\n"); 818 root = open_root_dentry(fsc, "", started); 819 if (IS_ERR(root)) { 820 err = PTR_ERR(root); 821 goto out; 822 } 823 fsc->sb->s_root = root; 824 first = 1; 825 826 err = ceph_fs_debugfs_init(fsc); 827 if (err < 0) 828 goto fail; 829 } 830 831 if (!fsc->mount_options->server_path) { 832 root = fsc->sb->s_root; 833 dget(root); 834 } else { 835 const char *path = fsc->mount_options->server_path + 1; 836 dout("mount opening path %s\n", path); 837 root = open_root_dentry(fsc, path, started); 838 if (IS_ERR(root)) { 839 err = PTR_ERR(root); 840 goto fail; 841 } 842 } 843 844 fsc->mount_state = CEPH_MOUNT_MOUNTED; 845 dout("mount success\n"); 846 mutex_unlock(&fsc->client->mount_mutex); 847 return root; 848 849 fail: 850 if (first) { 851 dput(fsc->sb->s_root); 852 fsc->sb->s_root = NULL; 853 } 854 out: 855 mutex_unlock(&fsc->client->mount_mutex); 856 return ERR_PTR(err); 857 } 858 859 static int ceph_set_super(struct super_block *s, void *data) 860 { 861 struct ceph_fs_client *fsc = data; 862 int ret; 863 864 dout("set_super %p data %p\n", s, data); 865 866 s->s_flags = fsc->mount_options->sb_flags; 867 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 868 869 s->s_xattr = ceph_xattr_handlers; 870 s->s_fs_info = fsc; 871 fsc->sb = s; 872 873 s->s_op = &ceph_super_ops; 874 s->s_export_op = &ceph_export_ops; 875 876 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 877 878 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 879 if (ret != 0) 880 goto fail; 881 882 return ret; 883 884 fail: 885 s->s_fs_info = NULL; 886 fsc->sb = NULL; 887 return ret; 888 } 889 890 /* 891 * share superblock if same fs AND options 892 */ 893 static int ceph_compare_super(struct super_block *sb, void *data) 894 { 895 struct ceph_fs_client *new = data; 896 struct ceph_mount_options *fsopt = new->mount_options; 897 struct ceph_options *opt = new->client->options; 898 struct ceph_fs_client *other = ceph_sb_to_client(sb); 899 900 dout("ceph_compare_super %p\n", sb); 901 902 if (compare_mount_options(fsopt, opt, other)) { 903 dout("monitor(s)/mount options don't match\n"); 904 return 0; 905 } 906 if ((opt->flags & CEPH_OPT_FSID) && 907 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 908 dout("fsid doesn't match\n"); 909 return 0; 910 } 911 if (fsopt->sb_flags != other->mount_options->sb_flags) { 912 dout("flags differ\n"); 913 return 0; 914 } 915 return 1; 916 } 917 918 /* 919 * construct our own bdi so we can control readahead, etc. 920 */ 921 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 922 923 static int ceph_register_bdi(struct super_block *sb, 924 struct ceph_fs_client *fsc) 925 { 926 int err; 927 928 /* set ra_pages based on rasize mount option? */ 929 if (fsc->mount_options->rasize >= PAGE_SIZE) 930 fsc->backing_dev_info.ra_pages = 931 (fsc->mount_options->rasize + PAGE_SIZE - 1) 932 >> PAGE_SHIFT; 933 else 934 fsc->backing_dev_info.ra_pages = 935 VM_MAX_READAHEAD * 1024 / PAGE_SIZE; 936 937 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%ld", 938 atomic_long_inc_return(&bdi_seq)); 939 if (!err) 940 sb->s_bdi = &fsc->backing_dev_info; 941 return err; 942 } 943 944 static struct dentry *ceph_mount(struct file_system_type *fs_type, 945 int flags, const char *dev_name, void *data) 946 { 947 struct super_block *sb; 948 struct ceph_fs_client *fsc; 949 struct dentry *res; 950 int err; 951 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 952 struct ceph_mount_options *fsopt = NULL; 953 struct ceph_options *opt = NULL; 954 955 dout("ceph_mount\n"); 956 957 #ifdef CONFIG_CEPH_FS_POSIX_ACL 958 flags |= MS_POSIXACL; 959 #endif 960 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 961 if (err < 0) { 962 res = ERR_PTR(err); 963 goto out_final; 964 } 965 966 /* create client (which we may/may not use) */ 967 fsc = create_fs_client(fsopt, opt); 968 if (IS_ERR(fsc)) { 969 res = ERR_CAST(fsc); 970 destroy_mount_options(fsopt); 971 ceph_destroy_options(opt); 972 goto out_final; 973 } 974 975 err = ceph_mdsc_init(fsc); 976 if (err < 0) { 977 res = ERR_PTR(err); 978 goto out; 979 } 980 981 if (ceph_test_opt(fsc->client, NOSHARE)) 982 compare_super = NULL; 983 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 984 if (IS_ERR(sb)) { 985 res = ERR_CAST(sb); 986 goto out; 987 } 988 989 if (ceph_sb_to_client(sb) != fsc) { 990 ceph_mdsc_destroy(fsc); 991 destroy_fs_client(fsc); 992 fsc = ceph_sb_to_client(sb); 993 dout("get_sb got existing client %p\n", fsc); 994 } else { 995 dout("get_sb using new client %p\n", fsc); 996 err = ceph_register_bdi(sb, fsc); 997 if (err < 0) { 998 res = ERR_PTR(err); 999 goto out_splat; 1000 } 1001 } 1002 1003 res = ceph_real_mount(fsc); 1004 if (IS_ERR(res)) 1005 goto out_splat; 1006 dout("root %p inode %p ino %llx.%llx\n", res, 1007 d_inode(res), ceph_vinop(d_inode(res))); 1008 return res; 1009 1010 out_splat: 1011 ceph_mdsc_close_sessions(fsc->mdsc); 1012 deactivate_locked_super(sb); 1013 goto out_final; 1014 1015 out: 1016 ceph_mdsc_destroy(fsc); 1017 destroy_fs_client(fsc); 1018 out_final: 1019 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1020 return res; 1021 } 1022 1023 static void ceph_kill_sb(struct super_block *s) 1024 { 1025 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1026 dev_t dev = s->s_dev; 1027 1028 dout("kill_sb %p\n", s); 1029 1030 ceph_mdsc_pre_umount(fsc->mdsc); 1031 generic_shutdown_super(s); 1032 ceph_mdsc_destroy(fsc); 1033 1034 destroy_fs_client(fsc); 1035 free_anon_bdev(dev); 1036 } 1037 1038 static struct file_system_type ceph_fs_type = { 1039 .owner = THIS_MODULE, 1040 .name = "ceph", 1041 .mount = ceph_mount, 1042 .kill_sb = ceph_kill_sb, 1043 .fs_flags = FS_RENAME_DOES_D_MOVE, 1044 }; 1045 MODULE_ALIAS_FS("ceph"); 1046 1047 static int __init init_ceph(void) 1048 { 1049 int ret = init_caches(); 1050 if (ret) 1051 goto out; 1052 1053 ceph_flock_init(); 1054 ceph_xattr_init(); 1055 ret = register_filesystem(&ceph_fs_type); 1056 if (ret) 1057 goto out_xattr; 1058 1059 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1060 1061 return 0; 1062 1063 out_xattr: 1064 ceph_xattr_exit(); 1065 destroy_caches(); 1066 out: 1067 return ret; 1068 } 1069 1070 static void __exit exit_ceph(void) 1071 { 1072 dout("exit_ceph\n"); 1073 unregister_filesystem(&ceph_fs_type); 1074 ceph_xattr_exit(); 1075 destroy_caches(); 1076 } 1077 1078 module_init(init_ceph); 1079 module_exit(exit_ceph); 1080 1081 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1082 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1083 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1084 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1085 MODULE_LICENSE("GPL"); 1086