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