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