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