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 21 #include <linux/ceph/decode.h> 22 #include <linux/ceph/mon_client.h> 23 #include <linux/ceph/auth.h> 24 #include <linux/ceph/debugfs.h> 25 26 /* 27 * Ceph superblock operations 28 * 29 * Handle the basics of mounting, unmounting. 30 */ 31 32 /* 33 * super ops 34 */ 35 static void ceph_put_super(struct super_block *s) 36 { 37 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 38 39 dout("put_super\n"); 40 ceph_mdsc_close_sessions(fsc->mdsc); 41 42 /* 43 * ensure we release the bdi before put_anon_super releases 44 * the device name. 45 */ 46 if (s->s_bdi == &fsc->backing_dev_info) { 47 bdi_unregister(&fsc->backing_dev_info); 48 s->s_bdi = NULL; 49 } 50 51 return; 52 } 53 54 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 55 { 56 struct ceph_fs_client *fsc = ceph_inode_to_client(dentry->d_inode); 57 struct ceph_monmap *monmap = fsc->client->monc.monmap; 58 struct ceph_statfs st; 59 u64 fsid; 60 int err; 61 62 dout("statfs\n"); 63 err = ceph_monc_do_statfs(&fsc->client->monc, &st); 64 if (err < 0) 65 return err; 66 67 /* fill in kstatfs */ 68 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 69 70 /* 71 * express utilization in terms of large blocks to avoid 72 * overflow on 32-bit machines. 73 */ 74 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 75 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 76 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 77 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 78 79 buf->f_files = le64_to_cpu(st.num_objects); 80 buf->f_ffree = -1; 81 buf->f_namelen = NAME_MAX; 82 buf->f_frsize = PAGE_CACHE_SIZE; 83 84 /* leave fsid little-endian, regardless of host endianness */ 85 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 86 buf->f_fsid.val[0] = fsid & 0xffffffff; 87 buf->f_fsid.val[1] = fsid >> 32; 88 89 return 0; 90 } 91 92 93 static int ceph_sync_fs(struct super_block *sb, int wait) 94 { 95 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 96 97 if (!wait) { 98 dout("sync_fs (non-blocking)\n"); 99 ceph_flush_dirty_caps(fsc->mdsc); 100 dout("sync_fs (non-blocking) done\n"); 101 return 0; 102 } 103 104 dout("sync_fs (blocking)\n"); 105 ceph_osdc_sync(&fsc->client->osdc); 106 ceph_mdsc_sync(fsc->mdsc); 107 dout("sync_fs (blocking) done\n"); 108 return 0; 109 } 110 111 /* 112 * mount options 113 */ 114 enum { 115 Opt_wsize, 116 Opt_rsize, 117 Opt_rasize, 118 Opt_caps_wanted_delay_min, 119 Opt_caps_wanted_delay_max, 120 Opt_cap_release_safety, 121 Opt_readdir_max_entries, 122 Opt_readdir_max_bytes, 123 Opt_congestion_kb, 124 Opt_last_int, 125 /* int args above */ 126 Opt_snapdirname, 127 Opt_last_string, 128 /* string args above */ 129 Opt_dirstat, 130 Opt_nodirstat, 131 Opt_rbytes, 132 Opt_norbytes, 133 Opt_noasyncreaddir, 134 Opt_dcache, 135 Opt_nodcache, 136 Opt_ino32, 137 }; 138 139 static match_table_t fsopt_tokens = { 140 {Opt_wsize, "wsize=%d"}, 141 {Opt_rsize, "rsize=%d"}, 142 {Opt_rasize, "rasize=%d"}, 143 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 144 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 145 {Opt_cap_release_safety, "cap_release_safety=%d"}, 146 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 147 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 148 {Opt_congestion_kb, "write_congestion_kb=%d"}, 149 /* int args above */ 150 {Opt_snapdirname, "snapdirname=%s"}, 151 /* string args above */ 152 {Opt_dirstat, "dirstat"}, 153 {Opt_nodirstat, "nodirstat"}, 154 {Opt_rbytes, "rbytes"}, 155 {Opt_norbytes, "norbytes"}, 156 {Opt_noasyncreaddir, "noasyncreaddir"}, 157 {Opt_dcache, "dcache"}, 158 {Opt_nodcache, "nodcache"}, 159 {Opt_ino32, "ino32"}, 160 {-1, NULL} 161 }; 162 163 static int parse_fsopt_token(char *c, void *private) 164 { 165 struct ceph_mount_options *fsopt = private; 166 substring_t argstr[MAX_OPT_ARGS]; 167 int token, intval, ret; 168 169 token = match_token((char *)c, fsopt_tokens, argstr); 170 if (token < 0) 171 return -EINVAL; 172 173 if (token < Opt_last_int) { 174 ret = match_int(&argstr[0], &intval); 175 if (ret < 0) { 176 pr_err("bad mount option arg (not int) " 177 "at '%s'\n", c); 178 return ret; 179 } 180 dout("got int token %d val %d\n", token, intval); 181 } else if (token > Opt_last_int && token < Opt_last_string) { 182 dout("got string token %d val %s\n", token, 183 argstr[0].from); 184 } else { 185 dout("got token %d\n", token); 186 } 187 188 switch (token) { 189 case Opt_snapdirname: 190 kfree(fsopt->snapdir_name); 191 fsopt->snapdir_name = kstrndup(argstr[0].from, 192 argstr[0].to-argstr[0].from, 193 GFP_KERNEL); 194 if (!fsopt->snapdir_name) 195 return -ENOMEM; 196 break; 197 198 /* misc */ 199 case Opt_wsize: 200 fsopt->wsize = intval; 201 break; 202 case Opt_rsize: 203 fsopt->rsize = intval; 204 break; 205 case Opt_rasize: 206 fsopt->rasize = intval; 207 break; 208 case Opt_caps_wanted_delay_min: 209 fsopt->caps_wanted_delay_min = intval; 210 break; 211 case Opt_caps_wanted_delay_max: 212 fsopt->caps_wanted_delay_max = intval; 213 break; 214 case Opt_readdir_max_entries: 215 fsopt->max_readdir = intval; 216 break; 217 case Opt_readdir_max_bytes: 218 fsopt->max_readdir_bytes = intval; 219 break; 220 case Opt_congestion_kb: 221 fsopt->congestion_kb = intval; 222 break; 223 case Opt_dirstat: 224 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 225 break; 226 case Opt_nodirstat: 227 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 228 break; 229 case Opt_rbytes: 230 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 231 break; 232 case Opt_norbytes: 233 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 234 break; 235 case Opt_noasyncreaddir: 236 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 237 break; 238 case Opt_dcache: 239 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 240 break; 241 case Opt_nodcache: 242 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 243 break; 244 case Opt_ino32: 245 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 246 break; 247 default: 248 BUG_ON(token); 249 } 250 return 0; 251 } 252 253 static void destroy_mount_options(struct ceph_mount_options *args) 254 { 255 dout("destroy_mount_options %p\n", args); 256 kfree(args->snapdir_name); 257 kfree(args); 258 } 259 260 static int strcmp_null(const char *s1, const char *s2) 261 { 262 if (!s1 && !s2) 263 return 0; 264 if (s1 && !s2) 265 return -1; 266 if (!s1 && s2) 267 return 1; 268 return strcmp(s1, s2); 269 } 270 271 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 272 struct ceph_options *new_opt, 273 struct ceph_fs_client *fsc) 274 { 275 struct ceph_mount_options *fsopt1 = new_fsopt; 276 struct ceph_mount_options *fsopt2 = fsc->mount_options; 277 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 278 int ret; 279 280 ret = memcmp(fsopt1, fsopt2, ofs); 281 if (ret) 282 return ret; 283 284 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 285 if (ret) 286 return ret; 287 288 return ceph_compare_options(new_opt, fsc->client); 289 } 290 291 static int parse_mount_options(struct ceph_mount_options **pfsopt, 292 struct ceph_options **popt, 293 int flags, char *options, 294 const char *dev_name, 295 const char **path) 296 { 297 struct ceph_mount_options *fsopt; 298 const char *dev_name_end; 299 int err = -ENOMEM; 300 301 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 302 if (!fsopt) 303 return -ENOMEM; 304 305 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 306 307 fsopt->sb_flags = flags; 308 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 309 310 fsopt->rsize = CEPH_RSIZE_DEFAULT; 311 fsopt->rasize = CEPH_RASIZE_DEFAULT; 312 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 313 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 314 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 315 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 316 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 317 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 318 fsopt->congestion_kb = default_congestion_kb(); 319 320 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 321 err = -EINVAL; 322 if (!dev_name) 323 goto out; 324 *path = strstr(dev_name, ":/"); 325 if (*path == NULL) { 326 pr_err("device name is missing path (no :/ in %s)\n", 327 dev_name); 328 goto out; 329 } 330 dev_name_end = *path; 331 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 332 333 /* path on server */ 334 *path += 2; 335 dout("server path '%s'\n", *path); 336 337 *popt = ceph_parse_options(options, dev_name, dev_name_end, 338 parse_fsopt_token, (void *)fsopt); 339 if (IS_ERR(*popt)) { 340 err = PTR_ERR(*popt); 341 goto out; 342 } 343 344 /* success */ 345 *pfsopt = fsopt; 346 return 0; 347 348 out: 349 destroy_mount_options(fsopt); 350 return err; 351 } 352 353 /** 354 * ceph_show_options - Show mount options in /proc/mounts 355 * @m: seq_file to write to 356 * @root: root of that (sub)tree 357 */ 358 static int ceph_show_options(struct seq_file *m, struct dentry *root) 359 { 360 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 361 struct ceph_mount_options *fsopt = fsc->mount_options; 362 struct ceph_options *opt = fsc->client->options; 363 364 if (opt->flags & CEPH_OPT_FSID) 365 seq_printf(m, ",fsid=%pU", &opt->fsid); 366 if (opt->flags & CEPH_OPT_NOSHARE) 367 seq_puts(m, ",noshare"); 368 if (opt->flags & CEPH_OPT_NOCRC) 369 seq_puts(m, ",nocrc"); 370 371 if (opt->name) 372 seq_printf(m, ",name=%s", opt->name); 373 if (opt->key) 374 seq_puts(m, ",secret=<hidden>"); 375 376 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 377 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 378 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 379 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 380 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) 381 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout); 382 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 383 seq_printf(m, ",osdkeepalivetimeout=%d", 384 opt->osd_keepalive_timeout); 385 386 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 387 seq_puts(m, ",dirstat"); 388 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 389 seq_puts(m, ",norbytes"); 390 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 391 seq_puts(m, ",noasyncreaddir"); 392 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 393 seq_puts(m, ",dcache"); 394 else 395 seq_puts(m, ",nodcache"); 396 397 if (fsopt->wsize) 398 seq_printf(m, ",wsize=%d", fsopt->wsize); 399 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 400 seq_printf(m, ",rsize=%d", fsopt->rsize); 401 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 402 seq_printf(m, ",rasize=%d", fsopt->rasize); 403 if (fsopt->congestion_kb != default_congestion_kb()) 404 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 405 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 406 seq_printf(m, ",caps_wanted_delay_min=%d", 407 fsopt->caps_wanted_delay_min); 408 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 409 seq_printf(m, ",caps_wanted_delay_max=%d", 410 fsopt->caps_wanted_delay_max); 411 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 412 seq_printf(m, ",cap_release_safety=%d", 413 fsopt->cap_release_safety); 414 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 415 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 416 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 417 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 418 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 419 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 420 return 0; 421 } 422 423 /* 424 * handle any mon messages the standard library doesn't understand. 425 * return error if we don't either. 426 */ 427 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 428 { 429 struct ceph_fs_client *fsc = client->private; 430 int type = le16_to_cpu(msg->hdr.type); 431 432 switch (type) { 433 case CEPH_MSG_MDS_MAP: 434 ceph_mdsc_handle_map(fsc->mdsc, msg); 435 return 0; 436 437 default: 438 return -1; 439 } 440 } 441 442 /* 443 * create a new fs client 444 */ 445 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 446 struct ceph_options *opt) 447 { 448 struct ceph_fs_client *fsc; 449 const unsigned supported_features = 450 CEPH_FEATURE_FLOCK | 451 CEPH_FEATURE_DIRLAYOUTHASH; 452 const unsigned required_features = 0; 453 int err = -ENOMEM; 454 455 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 456 if (!fsc) 457 return ERR_PTR(-ENOMEM); 458 459 fsc->client = ceph_create_client(opt, fsc, supported_features, 460 required_features); 461 if (IS_ERR(fsc->client)) { 462 err = PTR_ERR(fsc->client); 463 goto fail; 464 } 465 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 466 fsc->client->monc.want_mdsmap = 1; 467 468 fsc->mount_options = fsopt; 469 470 fsc->sb = NULL; 471 fsc->mount_state = CEPH_MOUNT_MOUNTING; 472 473 atomic_long_set(&fsc->writeback_count, 0); 474 475 err = bdi_init(&fsc->backing_dev_info); 476 if (err < 0) 477 goto fail_client; 478 479 err = -ENOMEM; 480 /* 481 * The number of concurrent works can be high but they don't need 482 * to be processed in parallel, limit concurrency. 483 */ 484 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 485 if (fsc->wb_wq == NULL) 486 goto fail_bdi; 487 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 488 if (fsc->pg_inv_wq == NULL) 489 goto fail_wb_wq; 490 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 491 if (fsc->trunc_wq == NULL) 492 goto fail_pg_inv_wq; 493 494 /* set up mempools */ 495 err = -ENOMEM; 496 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 497 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); 498 if (!fsc->wb_pagevec_pool) 499 goto fail_trunc_wq; 500 501 /* caps */ 502 fsc->min_caps = fsopt->max_readdir; 503 504 return fsc; 505 506 fail_trunc_wq: 507 destroy_workqueue(fsc->trunc_wq); 508 fail_pg_inv_wq: 509 destroy_workqueue(fsc->pg_inv_wq); 510 fail_wb_wq: 511 destroy_workqueue(fsc->wb_wq); 512 fail_bdi: 513 bdi_destroy(&fsc->backing_dev_info); 514 fail_client: 515 ceph_destroy_client(fsc->client); 516 fail: 517 kfree(fsc); 518 return ERR_PTR(err); 519 } 520 521 static void destroy_fs_client(struct ceph_fs_client *fsc) 522 { 523 dout("destroy_fs_client %p\n", fsc); 524 525 destroy_workqueue(fsc->wb_wq); 526 destroy_workqueue(fsc->pg_inv_wq); 527 destroy_workqueue(fsc->trunc_wq); 528 529 bdi_destroy(&fsc->backing_dev_info); 530 531 mempool_destroy(fsc->wb_pagevec_pool); 532 533 destroy_mount_options(fsc->mount_options); 534 535 ceph_fs_debugfs_cleanup(fsc); 536 537 ceph_destroy_client(fsc->client); 538 539 kfree(fsc); 540 dout("destroy_fs_client %p done\n", fsc); 541 } 542 543 /* 544 * caches 545 */ 546 struct kmem_cache *ceph_inode_cachep; 547 struct kmem_cache *ceph_cap_cachep; 548 struct kmem_cache *ceph_dentry_cachep; 549 struct kmem_cache *ceph_file_cachep; 550 551 static void ceph_inode_init_once(void *foo) 552 { 553 struct ceph_inode_info *ci = foo; 554 inode_init_once(&ci->vfs_inode); 555 } 556 557 static int __init init_caches(void) 558 { 559 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 560 sizeof(struct ceph_inode_info), 561 __alignof__(struct ceph_inode_info), 562 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 563 ceph_inode_init_once); 564 if (ceph_inode_cachep == NULL) 565 return -ENOMEM; 566 567 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 568 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 569 if (ceph_cap_cachep == NULL) 570 goto bad_cap; 571 572 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 573 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 574 if (ceph_dentry_cachep == NULL) 575 goto bad_dentry; 576 577 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 578 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 579 if (ceph_file_cachep == NULL) 580 goto bad_file; 581 582 return 0; 583 584 bad_file: 585 kmem_cache_destroy(ceph_dentry_cachep); 586 bad_dentry: 587 kmem_cache_destroy(ceph_cap_cachep); 588 bad_cap: 589 kmem_cache_destroy(ceph_inode_cachep); 590 return -ENOMEM; 591 } 592 593 static void destroy_caches(void) 594 { 595 kmem_cache_destroy(ceph_inode_cachep); 596 kmem_cache_destroy(ceph_cap_cachep); 597 kmem_cache_destroy(ceph_dentry_cachep); 598 kmem_cache_destroy(ceph_file_cachep); 599 } 600 601 602 /* 603 * ceph_umount_begin - initiate forced umount. Tear down down the 604 * mount, skipping steps that may hang while waiting for server(s). 605 */ 606 static void ceph_umount_begin(struct super_block *sb) 607 { 608 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 609 610 dout("ceph_umount_begin - starting forced umount\n"); 611 if (!fsc) 612 return; 613 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 614 return; 615 } 616 617 static const struct super_operations ceph_super_ops = { 618 .alloc_inode = ceph_alloc_inode, 619 .destroy_inode = ceph_destroy_inode, 620 .write_inode = ceph_write_inode, 621 .sync_fs = ceph_sync_fs, 622 .put_super = ceph_put_super, 623 .show_options = ceph_show_options, 624 .statfs = ceph_statfs, 625 .umount_begin = ceph_umount_begin, 626 }; 627 628 /* 629 * Bootstrap mount by opening the root directory. Note the mount 630 * @started time from caller, and time out if this takes too long. 631 */ 632 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 633 const char *path, 634 unsigned long started) 635 { 636 struct ceph_mds_client *mdsc = fsc->mdsc; 637 struct ceph_mds_request *req = NULL; 638 int err; 639 struct dentry *root; 640 641 /* open dir */ 642 dout("open_root_inode opening '%s'\n", path); 643 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 644 if (IS_ERR(req)) 645 return ERR_CAST(req); 646 req->r_path1 = kstrdup(path, GFP_NOFS); 647 req->r_ino1.ino = CEPH_INO_ROOT; 648 req->r_ino1.snap = CEPH_NOSNAP; 649 req->r_started = started; 650 req->r_timeout = fsc->client->options->mount_timeout * HZ; 651 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 652 req->r_num_caps = 2; 653 err = ceph_mdsc_do_request(mdsc, NULL, req); 654 if (err == 0) { 655 struct inode *inode = req->r_target_inode; 656 req->r_target_inode = NULL; 657 dout("open_root_inode success\n"); 658 if (ceph_ino(inode) == CEPH_INO_ROOT && 659 fsc->sb->s_root == NULL) { 660 root = d_alloc_root(inode); 661 if (!root) { 662 iput(inode); 663 root = ERR_PTR(-ENOMEM); 664 goto out; 665 } 666 } else { 667 root = d_obtain_alias(inode); 668 } 669 ceph_init_dentry(root); 670 dout("open_root_inode success, root dentry is %p\n", root); 671 } else { 672 root = ERR_PTR(err); 673 } 674 out: 675 ceph_mdsc_put_request(req); 676 return root; 677 } 678 679 680 681 682 /* 683 * mount: join the ceph cluster, and open root directory. 684 */ 685 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 686 const char *path) 687 { 688 int err; 689 unsigned long started = jiffies; /* note the start time */ 690 struct dentry *root; 691 int first = 0; /* first vfsmount for this super_block */ 692 693 dout("mount start\n"); 694 mutex_lock(&fsc->client->mount_mutex); 695 696 err = __ceph_open_session(fsc->client, started); 697 if (err < 0) 698 goto out; 699 700 dout("mount opening root\n"); 701 root = open_root_dentry(fsc, "", started); 702 if (IS_ERR(root)) { 703 err = PTR_ERR(root); 704 goto out; 705 } 706 if (fsc->sb->s_root) { 707 dput(root); 708 } else { 709 fsc->sb->s_root = root; 710 first = 1; 711 712 err = ceph_fs_debugfs_init(fsc); 713 if (err < 0) 714 goto fail; 715 } 716 717 if (path[0] == 0) { 718 dget(root); 719 } else { 720 dout("mount opening base mountpoint\n"); 721 root = open_root_dentry(fsc, path, started); 722 if (IS_ERR(root)) { 723 err = PTR_ERR(root); 724 goto fail; 725 } 726 } 727 728 fsc->mount_state = CEPH_MOUNT_MOUNTED; 729 dout("mount success\n"); 730 mutex_unlock(&fsc->client->mount_mutex); 731 return root; 732 733 out: 734 mutex_unlock(&fsc->client->mount_mutex); 735 return ERR_PTR(err); 736 737 fail: 738 if (first) { 739 dput(fsc->sb->s_root); 740 fsc->sb->s_root = NULL; 741 } 742 goto out; 743 } 744 745 static int ceph_set_super(struct super_block *s, void *data) 746 { 747 struct ceph_fs_client *fsc = data; 748 int ret; 749 750 dout("set_super %p data %p\n", s, data); 751 752 s->s_flags = fsc->mount_options->sb_flags; 753 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 754 755 s->s_fs_info = fsc; 756 fsc->sb = s; 757 758 s->s_op = &ceph_super_ops; 759 s->s_export_op = &ceph_export_ops; 760 761 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 762 763 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 764 if (ret != 0) 765 goto fail; 766 767 return ret; 768 769 fail: 770 s->s_fs_info = NULL; 771 fsc->sb = NULL; 772 return ret; 773 } 774 775 /* 776 * share superblock if same fs AND options 777 */ 778 static int ceph_compare_super(struct super_block *sb, void *data) 779 { 780 struct ceph_fs_client *new = data; 781 struct ceph_mount_options *fsopt = new->mount_options; 782 struct ceph_options *opt = new->client->options; 783 struct ceph_fs_client *other = ceph_sb_to_client(sb); 784 785 dout("ceph_compare_super %p\n", sb); 786 787 if (compare_mount_options(fsopt, opt, other)) { 788 dout("monitor(s)/mount options don't match\n"); 789 return 0; 790 } 791 if ((opt->flags & CEPH_OPT_FSID) && 792 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 793 dout("fsid doesn't match\n"); 794 return 0; 795 } 796 if (fsopt->sb_flags != other->mount_options->sb_flags) { 797 dout("flags differ\n"); 798 return 0; 799 } 800 return 1; 801 } 802 803 /* 804 * construct our own bdi so we can control readahead, etc. 805 */ 806 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 807 808 static int ceph_register_bdi(struct super_block *sb, 809 struct ceph_fs_client *fsc) 810 { 811 int err; 812 813 /* set ra_pages based on rasize mount option? */ 814 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 815 fsc->backing_dev_info.ra_pages = 816 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 817 >> PAGE_SHIFT; 818 else 819 fsc->backing_dev_info.ra_pages = 820 default_backing_dev_info.ra_pages; 821 822 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d", 823 atomic_long_inc_return(&bdi_seq)); 824 if (!err) 825 sb->s_bdi = &fsc->backing_dev_info; 826 return err; 827 } 828 829 static struct dentry *ceph_mount(struct file_system_type *fs_type, 830 int flags, const char *dev_name, void *data) 831 { 832 struct super_block *sb; 833 struct ceph_fs_client *fsc; 834 struct dentry *res; 835 int err; 836 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 837 const char *path = NULL; 838 struct ceph_mount_options *fsopt = NULL; 839 struct ceph_options *opt = NULL; 840 841 dout("ceph_mount\n"); 842 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 843 if (err < 0) { 844 res = ERR_PTR(err); 845 goto out_final; 846 } 847 848 /* create client (which we may/may not use) */ 849 fsc = create_fs_client(fsopt, opt); 850 if (IS_ERR(fsc)) { 851 res = ERR_CAST(fsc); 852 destroy_mount_options(fsopt); 853 ceph_destroy_options(opt); 854 goto out_final; 855 } 856 857 err = ceph_mdsc_init(fsc); 858 if (err < 0) { 859 res = ERR_PTR(err); 860 goto out; 861 } 862 863 if (ceph_test_opt(fsc->client, NOSHARE)) 864 compare_super = NULL; 865 sb = sget(fs_type, compare_super, ceph_set_super, fsc); 866 if (IS_ERR(sb)) { 867 res = ERR_CAST(sb); 868 goto out; 869 } 870 871 if (ceph_sb_to_client(sb) != fsc) { 872 ceph_mdsc_destroy(fsc); 873 destroy_fs_client(fsc); 874 fsc = ceph_sb_to_client(sb); 875 dout("get_sb got existing client %p\n", fsc); 876 } else { 877 dout("get_sb using new client %p\n", fsc); 878 err = ceph_register_bdi(sb, fsc); 879 if (err < 0) { 880 res = ERR_PTR(err); 881 goto out_splat; 882 } 883 } 884 885 res = ceph_real_mount(fsc, path); 886 if (IS_ERR(res)) 887 goto out_splat; 888 dout("root %p inode %p ino %llx.%llx\n", res, 889 res->d_inode, ceph_vinop(res->d_inode)); 890 return res; 891 892 out_splat: 893 ceph_mdsc_close_sessions(fsc->mdsc); 894 deactivate_locked_super(sb); 895 goto out_final; 896 897 out: 898 ceph_mdsc_destroy(fsc); 899 destroy_fs_client(fsc); 900 out_final: 901 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 902 return res; 903 } 904 905 static void ceph_kill_sb(struct super_block *s) 906 { 907 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 908 dout("kill_sb %p\n", s); 909 ceph_mdsc_pre_umount(fsc->mdsc); 910 kill_anon_super(s); /* will call put_super after sb is r/o */ 911 ceph_mdsc_destroy(fsc); 912 destroy_fs_client(fsc); 913 } 914 915 static struct file_system_type ceph_fs_type = { 916 .owner = THIS_MODULE, 917 .name = "ceph", 918 .mount = ceph_mount, 919 .kill_sb = ceph_kill_sb, 920 .fs_flags = FS_RENAME_DOES_D_MOVE, 921 }; 922 923 #define _STRINGIFY(x) #x 924 #define STRINGIFY(x) _STRINGIFY(x) 925 926 static int __init init_ceph(void) 927 { 928 int ret = init_caches(); 929 if (ret) 930 goto out; 931 932 ceph_xattr_init(); 933 ret = register_filesystem(&ceph_fs_type); 934 if (ret) 935 goto out_icache; 936 937 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 938 939 return 0; 940 941 out_icache: 942 ceph_xattr_exit(); 943 destroy_caches(); 944 out: 945 return ret; 946 } 947 948 static void __exit exit_ceph(void) 949 { 950 dout("exit_ceph\n"); 951 unregister_filesystem(&ceph_fs_type); 952 ceph_xattr_exit(); 953 destroy_caches(); 954 } 955 956 module_init(init_ceph); 957 module_exit(exit_ceph); 958 959 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 960 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 961 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 962 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 963 MODULE_LICENSE("GPL"); 964