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 err = ceph_parse_options(popt, options, dev_name, dev_name_end, 338 parse_fsopt_token, (void *)fsopt); 339 if (err) 340 goto out; 341 342 /* success */ 343 *pfsopt = fsopt; 344 return 0; 345 346 out: 347 destroy_mount_options(fsopt); 348 return err; 349 } 350 351 /** 352 * ceph_show_options - Show mount options in /proc/mounts 353 * @m: seq_file to write to 354 * @root: root of that (sub)tree 355 */ 356 static int ceph_show_options(struct seq_file *m, struct dentry *root) 357 { 358 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 359 struct ceph_mount_options *fsopt = fsc->mount_options; 360 struct ceph_options *opt = fsc->client->options; 361 362 if (opt->flags & CEPH_OPT_FSID) 363 seq_printf(m, ",fsid=%pU", &opt->fsid); 364 if (opt->flags & CEPH_OPT_NOSHARE) 365 seq_puts(m, ",noshare"); 366 if (opt->flags & CEPH_OPT_NOCRC) 367 seq_puts(m, ",nocrc"); 368 369 if (opt->name) 370 seq_printf(m, ",name=%s", opt->name); 371 if (opt->key) 372 seq_puts(m, ",secret=<hidden>"); 373 374 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 375 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 376 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 377 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 378 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) 379 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout); 380 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 381 seq_printf(m, ",osdkeepalivetimeout=%d", 382 opt->osd_keepalive_timeout); 383 384 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 385 seq_puts(m, ",dirstat"); 386 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 387 seq_puts(m, ",norbytes"); 388 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 389 seq_puts(m, ",noasyncreaddir"); 390 if (fsopt->flags & CEPH_MOUNT_OPT_DCACHE) 391 seq_puts(m, ",dcache"); 392 else 393 seq_puts(m, ",nodcache"); 394 395 if (fsopt->wsize) 396 seq_printf(m, ",wsize=%d", fsopt->wsize); 397 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 398 seq_printf(m, ",rsize=%d", fsopt->rsize); 399 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 400 seq_printf(m, ",rasize=%d", fsopt->rasize); 401 if (fsopt->congestion_kb != default_congestion_kb()) 402 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 403 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 404 seq_printf(m, ",caps_wanted_delay_min=%d", 405 fsopt->caps_wanted_delay_min); 406 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 407 seq_printf(m, ",caps_wanted_delay_max=%d", 408 fsopt->caps_wanted_delay_max); 409 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 410 seq_printf(m, ",cap_release_safety=%d", 411 fsopt->cap_release_safety); 412 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 413 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 414 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 415 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 416 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 417 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 418 return 0; 419 } 420 421 /* 422 * handle any mon messages the standard library doesn't understand. 423 * return error if we don't either. 424 */ 425 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 426 { 427 struct ceph_fs_client *fsc = client->private; 428 int type = le16_to_cpu(msg->hdr.type); 429 430 switch (type) { 431 case CEPH_MSG_MDS_MAP: 432 ceph_mdsc_handle_map(fsc->mdsc, msg); 433 return 0; 434 435 default: 436 return -1; 437 } 438 } 439 440 /* 441 * create a new fs client 442 */ 443 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 444 struct ceph_options *opt) 445 { 446 struct ceph_fs_client *fsc; 447 const unsigned supported_features = 448 CEPH_FEATURE_FLOCK | 449 CEPH_FEATURE_DIRLAYOUTHASH; 450 const unsigned required_features = 0; 451 int err = -ENOMEM; 452 453 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 454 if (!fsc) 455 return ERR_PTR(-ENOMEM); 456 457 fsc->client = ceph_create_client(opt, fsc, supported_features, 458 required_features); 459 if (IS_ERR(fsc->client)) { 460 err = PTR_ERR(fsc->client); 461 goto fail; 462 } 463 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 464 fsc->client->monc.want_mdsmap = 1; 465 466 fsc->mount_options = fsopt; 467 468 fsc->sb = NULL; 469 fsc->mount_state = CEPH_MOUNT_MOUNTING; 470 471 atomic_long_set(&fsc->writeback_count, 0); 472 473 err = bdi_init(&fsc->backing_dev_info); 474 if (err < 0) 475 goto fail_client; 476 477 err = -ENOMEM; 478 /* 479 * The number of concurrent works can be high but they don't need 480 * to be processed in parallel, limit concurrency. 481 */ 482 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 483 if (fsc->wb_wq == NULL) 484 goto fail_bdi; 485 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 486 if (fsc->pg_inv_wq == NULL) 487 goto fail_wb_wq; 488 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 489 if (fsc->trunc_wq == NULL) 490 goto fail_pg_inv_wq; 491 492 /* set up mempools */ 493 err = -ENOMEM; 494 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 495 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); 496 if (!fsc->wb_pagevec_pool) 497 goto fail_trunc_wq; 498 499 /* caps */ 500 fsc->min_caps = fsopt->max_readdir; 501 502 return fsc; 503 504 fail_trunc_wq: 505 destroy_workqueue(fsc->trunc_wq); 506 fail_pg_inv_wq: 507 destroy_workqueue(fsc->pg_inv_wq); 508 fail_wb_wq: 509 destroy_workqueue(fsc->wb_wq); 510 fail_bdi: 511 bdi_destroy(&fsc->backing_dev_info); 512 fail_client: 513 ceph_destroy_client(fsc->client); 514 fail: 515 kfree(fsc); 516 return ERR_PTR(err); 517 } 518 519 static void destroy_fs_client(struct ceph_fs_client *fsc) 520 { 521 dout("destroy_fs_client %p\n", fsc); 522 523 destroy_workqueue(fsc->wb_wq); 524 destroy_workqueue(fsc->pg_inv_wq); 525 destroy_workqueue(fsc->trunc_wq); 526 527 bdi_destroy(&fsc->backing_dev_info); 528 529 mempool_destroy(fsc->wb_pagevec_pool); 530 531 destroy_mount_options(fsc->mount_options); 532 533 ceph_fs_debugfs_cleanup(fsc); 534 535 ceph_destroy_client(fsc->client); 536 537 kfree(fsc); 538 dout("destroy_fs_client %p done\n", fsc); 539 } 540 541 /* 542 * caches 543 */ 544 struct kmem_cache *ceph_inode_cachep; 545 struct kmem_cache *ceph_cap_cachep; 546 struct kmem_cache *ceph_dentry_cachep; 547 struct kmem_cache *ceph_file_cachep; 548 549 static void ceph_inode_init_once(void *foo) 550 { 551 struct ceph_inode_info *ci = foo; 552 inode_init_once(&ci->vfs_inode); 553 } 554 555 static int __init init_caches(void) 556 { 557 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 558 sizeof(struct ceph_inode_info), 559 __alignof__(struct ceph_inode_info), 560 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 561 ceph_inode_init_once); 562 if (ceph_inode_cachep == NULL) 563 return -ENOMEM; 564 565 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 566 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 567 if (ceph_cap_cachep == NULL) 568 goto bad_cap; 569 570 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 571 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 572 if (ceph_dentry_cachep == NULL) 573 goto bad_dentry; 574 575 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 576 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 577 if (ceph_file_cachep == NULL) 578 goto bad_file; 579 580 return 0; 581 582 bad_file: 583 kmem_cache_destroy(ceph_dentry_cachep); 584 bad_dentry: 585 kmem_cache_destroy(ceph_cap_cachep); 586 bad_cap: 587 kmem_cache_destroy(ceph_inode_cachep); 588 return -ENOMEM; 589 } 590 591 static void destroy_caches(void) 592 { 593 kmem_cache_destroy(ceph_inode_cachep); 594 kmem_cache_destroy(ceph_cap_cachep); 595 kmem_cache_destroy(ceph_dentry_cachep); 596 kmem_cache_destroy(ceph_file_cachep); 597 } 598 599 600 /* 601 * ceph_umount_begin - initiate forced umount. Tear down down the 602 * mount, skipping steps that may hang while waiting for server(s). 603 */ 604 static void ceph_umount_begin(struct super_block *sb) 605 { 606 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 607 608 dout("ceph_umount_begin - starting forced umount\n"); 609 if (!fsc) 610 return; 611 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 612 return; 613 } 614 615 static const struct super_operations ceph_super_ops = { 616 .alloc_inode = ceph_alloc_inode, 617 .destroy_inode = ceph_destroy_inode, 618 .write_inode = ceph_write_inode, 619 .sync_fs = ceph_sync_fs, 620 .put_super = ceph_put_super, 621 .show_options = ceph_show_options, 622 .statfs = ceph_statfs, 623 .umount_begin = ceph_umount_begin, 624 }; 625 626 /* 627 * Bootstrap mount by opening the root directory. Note the mount 628 * @started time from caller, and time out if this takes too long. 629 */ 630 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 631 const char *path, 632 unsigned long started) 633 { 634 struct ceph_mds_client *mdsc = fsc->mdsc; 635 struct ceph_mds_request *req = NULL; 636 int err; 637 struct dentry *root; 638 639 /* open dir */ 640 dout("open_root_inode opening '%s'\n", path); 641 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 642 if (IS_ERR(req)) 643 return ERR_CAST(req); 644 req->r_path1 = kstrdup(path, GFP_NOFS); 645 req->r_ino1.ino = CEPH_INO_ROOT; 646 req->r_ino1.snap = CEPH_NOSNAP; 647 req->r_started = started; 648 req->r_timeout = fsc->client->options->mount_timeout * HZ; 649 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 650 req->r_num_caps = 2; 651 err = ceph_mdsc_do_request(mdsc, NULL, req); 652 if (err == 0) { 653 struct inode *inode = req->r_target_inode; 654 req->r_target_inode = NULL; 655 dout("open_root_inode success\n"); 656 if (ceph_ino(inode) == CEPH_INO_ROOT && 657 fsc->sb->s_root == NULL) { 658 root = d_alloc_root(inode); 659 if (!root) { 660 iput(inode); 661 root = ERR_PTR(-ENOMEM); 662 goto out; 663 } 664 } else { 665 root = d_obtain_alias(inode); 666 } 667 ceph_init_dentry(root); 668 dout("open_root_inode success, root dentry is %p\n", root); 669 } else { 670 root = ERR_PTR(err); 671 } 672 out: 673 ceph_mdsc_put_request(req); 674 return root; 675 } 676 677 678 679 680 /* 681 * mount: join the ceph cluster, and open root directory. 682 */ 683 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 684 const char *path) 685 { 686 int err; 687 unsigned long started = jiffies; /* note the start time */ 688 struct dentry *root; 689 int first = 0; /* first vfsmount for this super_block */ 690 691 dout("mount start\n"); 692 mutex_lock(&fsc->client->mount_mutex); 693 694 err = __ceph_open_session(fsc->client, started); 695 if (err < 0) 696 goto out; 697 698 dout("mount opening root\n"); 699 root = open_root_dentry(fsc, "", started); 700 if (IS_ERR(root)) { 701 err = PTR_ERR(root); 702 goto out; 703 } 704 if (fsc->sb->s_root) { 705 dput(root); 706 } else { 707 fsc->sb->s_root = root; 708 first = 1; 709 710 err = ceph_fs_debugfs_init(fsc); 711 if (err < 0) 712 goto fail; 713 } 714 715 if (path[0] == 0) { 716 dget(root); 717 } else { 718 dout("mount opening base mountpoint\n"); 719 root = open_root_dentry(fsc, path, started); 720 if (IS_ERR(root)) { 721 err = PTR_ERR(root); 722 goto fail; 723 } 724 } 725 726 fsc->mount_state = CEPH_MOUNT_MOUNTED; 727 dout("mount success\n"); 728 mutex_unlock(&fsc->client->mount_mutex); 729 return root; 730 731 out: 732 mutex_unlock(&fsc->client->mount_mutex); 733 return ERR_PTR(err); 734 735 fail: 736 if (first) { 737 dput(fsc->sb->s_root); 738 fsc->sb->s_root = NULL; 739 } 740 goto out; 741 } 742 743 static int ceph_set_super(struct super_block *s, void *data) 744 { 745 struct ceph_fs_client *fsc = data; 746 int ret; 747 748 dout("set_super %p data %p\n", s, data); 749 750 s->s_flags = fsc->mount_options->sb_flags; 751 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 752 753 s->s_fs_info = fsc; 754 fsc->sb = s; 755 756 s->s_op = &ceph_super_ops; 757 s->s_export_op = &ceph_export_ops; 758 759 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 760 761 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 762 if (ret != 0) 763 goto fail; 764 765 return ret; 766 767 fail: 768 s->s_fs_info = NULL; 769 fsc->sb = NULL; 770 return ret; 771 } 772 773 /* 774 * share superblock if same fs AND options 775 */ 776 static int ceph_compare_super(struct super_block *sb, void *data) 777 { 778 struct ceph_fs_client *new = data; 779 struct ceph_mount_options *fsopt = new->mount_options; 780 struct ceph_options *opt = new->client->options; 781 struct ceph_fs_client *other = ceph_sb_to_client(sb); 782 783 dout("ceph_compare_super %p\n", sb); 784 785 if (compare_mount_options(fsopt, opt, other)) { 786 dout("monitor(s)/mount options don't match\n"); 787 return 0; 788 } 789 if ((opt->flags & CEPH_OPT_FSID) && 790 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 791 dout("fsid doesn't match\n"); 792 return 0; 793 } 794 if (fsopt->sb_flags != other->mount_options->sb_flags) { 795 dout("flags differ\n"); 796 return 0; 797 } 798 return 1; 799 } 800 801 /* 802 * construct our own bdi so we can control readahead, etc. 803 */ 804 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 805 806 static int ceph_register_bdi(struct super_block *sb, 807 struct ceph_fs_client *fsc) 808 { 809 int err; 810 811 /* set ra_pages based on rasize mount option? */ 812 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 813 fsc->backing_dev_info.ra_pages = 814 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 815 >> PAGE_SHIFT; 816 else 817 fsc->backing_dev_info.ra_pages = 818 default_backing_dev_info.ra_pages; 819 820 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d", 821 atomic_long_inc_return(&bdi_seq)); 822 if (!err) 823 sb->s_bdi = &fsc->backing_dev_info; 824 return err; 825 } 826 827 static struct dentry *ceph_mount(struct file_system_type *fs_type, 828 int flags, const char *dev_name, void *data) 829 { 830 struct super_block *sb; 831 struct ceph_fs_client *fsc; 832 struct dentry *res; 833 int err; 834 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 835 const char *path = NULL; 836 struct ceph_mount_options *fsopt = NULL; 837 struct ceph_options *opt = NULL; 838 839 dout("ceph_mount\n"); 840 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 841 if (err < 0) { 842 res = ERR_PTR(err); 843 goto out_final; 844 } 845 846 /* create client (which we may/may not use) */ 847 fsc = create_fs_client(fsopt, opt); 848 if (IS_ERR(fsc)) { 849 res = ERR_CAST(fsc); 850 destroy_mount_options(fsopt); 851 ceph_destroy_options(opt); 852 goto out_final; 853 } 854 855 err = ceph_mdsc_init(fsc); 856 if (err < 0) { 857 res = ERR_PTR(err); 858 goto out; 859 } 860 861 if (ceph_test_opt(fsc->client, NOSHARE)) 862 compare_super = NULL; 863 sb = sget(fs_type, compare_super, ceph_set_super, fsc); 864 if (IS_ERR(sb)) { 865 res = ERR_CAST(sb); 866 goto out; 867 } 868 869 if (ceph_sb_to_client(sb) != fsc) { 870 ceph_mdsc_destroy(fsc); 871 destroy_fs_client(fsc); 872 fsc = ceph_sb_to_client(sb); 873 dout("get_sb got existing client %p\n", fsc); 874 } else { 875 dout("get_sb using new client %p\n", fsc); 876 err = ceph_register_bdi(sb, fsc); 877 if (err < 0) { 878 res = ERR_PTR(err); 879 goto out_splat; 880 } 881 } 882 883 res = ceph_real_mount(fsc, path); 884 if (IS_ERR(res)) 885 goto out_splat; 886 dout("root %p inode %p ino %llx.%llx\n", res, 887 res->d_inode, ceph_vinop(res->d_inode)); 888 return res; 889 890 out_splat: 891 ceph_mdsc_close_sessions(fsc->mdsc); 892 deactivate_locked_super(sb); 893 goto out_final; 894 895 out: 896 ceph_mdsc_destroy(fsc); 897 destroy_fs_client(fsc); 898 out_final: 899 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 900 return res; 901 } 902 903 static void ceph_kill_sb(struct super_block *s) 904 { 905 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 906 dout("kill_sb %p\n", s); 907 ceph_mdsc_pre_umount(fsc->mdsc); 908 kill_anon_super(s); /* will call put_super after sb is r/o */ 909 ceph_mdsc_destroy(fsc); 910 destroy_fs_client(fsc); 911 } 912 913 static struct file_system_type ceph_fs_type = { 914 .owner = THIS_MODULE, 915 .name = "ceph", 916 .mount = ceph_mount, 917 .kill_sb = ceph_kill_sb, 918 .fs_flags = FS_RENAME_DOES_D_MOVE, 919 }; 920 921 #define _STRINGIFY(x) #x 922 #define STRINGIFY(x) _STRINGIFY(x) 923 924 static int __init init_ceph(void) 925 { 926 int ret = init_caches(); 927 if (ret) 928 goto out; 929 930 ret = register_filesystem(&ceph_fs_type); 931 if (ret) 932 goto out_icache; 933 934 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 935 936 return 0; 937 938 out_icache: 939 destroy_caches(); 940 out: 941 return ret; 942 } 943 944 static void __exit exit_ceph(void) 945 { 946 dout("exit_ceph\n"); 947 unregister_filesystem(&ceph_fs_type); 948 destroy_caches(); 949 } 950 951 module_init(init_ceph); 952 module_exit(exit_ceph); 953 954 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 955 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 956 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 957 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 958 MODULE_LICENSE("GPL"); 959