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_ino32, 135 }; 136 137 static match_table_t fsopt_tokens = { 138 {Opt_wsize, "wsize=%d"}, 139 {Opt_rsize, "rsize=%d"}, 140 {Opt_rasize, "rasize=%d"}, 141 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 142 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 143 {Opt_cap_release_safety, "cap_release_safety=%d"}, 144 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 145 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 146 {Opt_congestion_kb, "write_congestion_kb=%d"}, 147 /* int args above */ 148 {Opt_snapdirname, "snapdirname=%s"}, 149 /* string args above */ 150 {Opt_dirstat, "dirstat"}, 151 {Opt_nodirstat, "nodirstat"}, 152 {Opt_rbytes, "rbytes"}, 153 {Opt_norbytes, "norbytes"}, 154 {Opt_noasyncreaddir, "noasyncreaddir"}, 155 {Opt_ino32, "ino32"}, 156 {-1, NULL} 157 }; 158 159 static int parse_fsopt_token(char *c, void *private) 160 { 161 struct ceph_mount_options *fsopt = private; 162 substring_t argstr[MAX_OPT_ARGS]; 163 int token, intval, ret; 164 165 token = match_token((char *)c, fsopt_tokens, argstr); 166 if (token < 0) 167 return -EINVAL; 168 169 if (token < Opt_last_int) { 170 ret = match_int(&argstr[0], &intval); 171 if (ret < 0) { 172 pr_err("bad mount option arg (not int) " 173 "at '%s'\n", c); 174 return ret; 175 } 176 dout("got int token %d val %d\n", token, intval); 177 } else if (token > Opt_last_int && token < Opt_last_string) { 178 dout("got string token %d val %s\n", token, 179 argstr[0].from); 180 } else { 181 dout("got token %d\n", token); 182 } 183 184 switch (token) { 185 case Opt_snapdirname: 186 kfree(fsopt->snapdir_name); 187 fsopt->snapdir_name = kstrndup(argstr[0].from, 188 argstr[0].to-argstr[0].from, 189 GFP_KERNEL); 190 if (!fsopt->snapdir_name) 191 return -ENOMEM; 192 break; 193 194 /* misc */ 195 case Opt_wsize: 196 fsopt->wsize = intval; 197 break; 198 case Opt_rsize: 199 fsopt->rsize = intval; 200 break; 201 case Opt_rasize: 202 fsopt->rasize = intval; 203 break; 204 case Opt_caps_wanted_delay_min: 205 fsopt->caps_wanted_delay_min = intval; 206 break; 207 case Opt_caps_wanted_delay_max: 208 fsopt->caps_wanted_delay_max = intval; 209 break; 210 case Opt_readdir_max_entries: 211 fsopt->max_readdir = intval; 212 break; 213 case Opt_readdir_max_bytes: 214 fsopt->max_readdir_bytes = intval; 215 break; 216 case Opt_congestion_kb: 217 fsopt->congestion_kb = intval; 218 break; 219 case Opt_dirstat: 220 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 221 break; 222 case Opt_nodirstat: 223 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 224 break; 225 case Opt_rbytes: 226 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 227 break; 228 case Opt_norbytes: 229 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 230 break; 231 case Opt_noasyncreaddir: 232 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 233 break; 234 case Opt_ino32: 235 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 236 break; 237 default: 238 BUG_ON(token); 239 } 240 return 0; 241 } 242 243 static void destroy_mount_options(struct ceph_mount_options *args) 244 { 245 dout("destroy_mount_options %p\n", args); 246 kfree(args->snapdir_name); 247 kfree(args); 248 } 249 250 static int strcmp_null(const char *s1, const char *s2) 251 { 252 if (!s1 && !s2) 253 return 0; 254 if (s1 && !s2) 255 return -1; 256 if (!s1 && s2) 257 return 1; 258 return strcmp(s1, s2); 259 } 260 261 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 262 struct ceph_options *new_opt, 263 struct ceph_fs_client *fsc) 264 { 265 struct ceph_mount_options *fsopt1 = new_fsopt; 266 struct ceph_mount_options *fsopt2 = fsc->mount_options; 267 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 268 int ret; 269 270 ret = memcmp(fsopt1, fsopt2, ofs); 271 if (ret) 272 return ret; 273 274 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 275 if (ret) 276 return ret; 277 278 return ceph_compare_options(new_opt, fsc->client); 279 } 280 281 static int parse_mount_options(struct ceph_mount_options **pfsopt, 282 struct ceph_options **popt, 283 int flags, char *options, 284 const char *dev_name, 285 const char **path) 286 { 287 struct ceph_mount_options *fsopt; 288 const char *dev_name_end; 289 int err = -ENOMEM; 290 291 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 292 if (!fsopt) 293 return -ENOMEM; 294 295 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 296 297 fsopt->sb_flags = flags; 298 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 299 300 fsopt->rsize = CEPH_RSIZE_DEFAULT; 301 fsopt->rasize = CEPH_RASIZE_DEFAULT; 302 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 303 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 304 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 305 fsopt->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 306 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 307 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 308 fsopt->congestion_kb = default_congestion_kb(); 309 310 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 311 err = -EINVAL; 312 if (!dev_name) 313 goto out; 314 *path = strstr(dev_name, ":/"); 315 if (*path == NULL) { 316 pr_err("device name is missing path (no :/ in %s)\n", 317 dev_name); 318 goto out; 319 } 320 dev_name_end = *path; 321 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 322 323 /* path on server */ 324 *path += 2; 325 dout("server path '%s'\n", *path); 326 327 err = ceph_parse_options(popt, options, dev_name, dev_name_end, 328 parse_fsopt_token, (void *)fsopt); 329 if (err) 330 goto out; 331 332 /* success */ 333 *pfsopt = fsopt; 334 return 0; 335 336 out: 337 destroy_mount_options(fsopt); 338 return err; 339 } 340 341 /** 342 * ceph_show_options - Show mount options in /proc/mounts 343 * @m: seq_file to write to 344 * @mnt: mount descriptor 345 */ 346 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) 347 { 348 struct ceph_fs_client *fsc = ceph_sb_to_client(mnt->mnt_sb); 349 struct ceph_mount_options *fsopt = fsc->mount_options; 350 struct ceph_options *opt = fsc->client->options; 351 352 if (opt->flags & CEPH_OPT_FSID) 353 seq_printf(m, ",fsid=%pU", &opt->fsid); 354 if (opt->flags & CEPH_OPT_NOSHARE) 355 seq_puts(m, ",noshare"); 356 if (opt->flags & CEPH_OPT_NOCRC) 357 seq_puts(m, ",nocrc"); 358 359 if (opt->name) 360 seq_printf(m, ",name=%s", opt->name); 361 if (opt->key) 362 seq_puts(m, ",secret=<hidden>"); 363 364 if (opt->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 365 seq_printf(m, ",mount_timeout=%d", opt->mount_timeout); 366 if (opt->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 367 seq_printf(m, ",osd_idle_ttl=%d", opt->osd_idle_ttl); 368 if (opt->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) 369 seq_printf(m, ",osdtimeout=%d", opt->osd_timeout); 370 if (opt->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 371 seq_printf(m, ",osdkeepalivetimeout=%d", 372 opt->osd_keepalive_timeout); 373 374 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 375 seq_puts(m, ",dirstat"); 376 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES) == 0) 377 seq_puts(m, ",norbytes"); 378 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 379 seq_puts(m, ",noasyncreaddir"); 380 381 if (fsopt->wsize) 382 seq_printf(m, ",wsize=%d", fsopt->wsize); 383 if (fsopt->rsize != CEPH_RSIZE_DEFAULT) 384 seq_printf(m, ",rsize=%d", fsopt->rsize); 385 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 386 seq_printf(m, ",rasize=%d", fsopt->rsize); 387 if (fsopt->congestion_kb != default_congestion_kb()) 388 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 389 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 390 seq_printf(m, ",caps_wanted_delay_min=%d", 391 fsopt->caps_wanted_delay_min); 392 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 393 seq_printf(m, ",caps_wanted_delay_max=%d", 394 fsopt->caps_wanted_delay_max); 395 if (fsopt->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 396 seq_printf(m, ",cap_release_safety=%d", 397 fsopt->cap_release_safety); 398 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 399 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 400 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 401 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 402 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 403 seq_printf(m, ",snapdirname=%s", fsopt->snapdir_name); 404 return 0; 405 } 406 407 /* 408 * handle any mon messages the standard library doesn't understand. 409 * return error if we don't either. 410 */ 411 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 412 { 413 struct ceph_fs_client *fsc = client->private; 414 int type = le16_to_cpu(msg->hdr.type); 415 416 switch (type) { 417 case CEPH_MSG_MDS_MAP: 418 ceph_mdsc_handle_map(fsc->mdsc, msg); 419 return 0; 420 421 default: 422 return -1; 423 } 424 } 425 426 /* 427 * create a new fs client 428 */ 429 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 430 struct ceph_options *opt) 431 { 432 struct ceph_fs_client *fsc; 433 const unsigned supported_features = 434 CEPH_FEATURE_FLOCK | 435 CEPH_FEATURE_DIRLAYOUTHASH; 436 const unsigned required_features = 0; 437 int err = -ENOMEM; 438 439 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 440 if (!fsc) 441 return ERR_PTR(-ENOMEM); 442 443 fsc->client = ceph_create_client(opt, fsc, supported_features, 444 required_features); 445 if (IS_ERR(fsc->client)) { 446 err = PTR_ERR(fsc->client); 447 goto fail; 448 } 449 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 450 fsc->client->monc.want_mdsmap = 1; 451 452 fsc->mount_options = fsopt; 453 454 fsc->sb = NULL; 455 fsc->mount_state = CEPH_MOUNT_MOUNTING; 456 457 atomic_long_set(&fsc->writeback_count, 0); 458 459 err = bdi_init(&fsc->backing_dev_info); 460 if (err < 0) 461 goto fail_client; 462 463 err = -ENOMEM; 464 /* 465 * The number of concurrent works can be high but they don't need 466 * to be processed in parallel, limit concurrency. 467 */ 468 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 469 if (fsc->wb_wq == NULL) 470 goto fail_bdi; 471 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 472 if (fsc->pg_inv_wq == NULL) 473 goto fail_wb_wq; 474 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 475 if (fsc->trunc_wq == NULL) 476 goto fail_pg_inv_wq; 477 478 /* set up mempools */ 479 err = -ENOMEM; 480 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 481 fsc->mount_options->wsize >> PAGE_CACHE_SHIFT); 482 if (!fsc->wb_pagevec_pool) 483 goto fail_trunc_wq; 484 485 /* caps */ 486 fsc->min_caps = fsopt->max_readdir; 487 488 return fsc; 489 490 fail_trunc_wq: 491 destroy_workqueue(fsc->trunc_wq); 492 fail_pg_inv_wq: 493 destroy_workqueue(fsc->pg_inv_wq); 494 fail_wb_wq: 495 destroy_workqueue(fsc->wb_wq); 496 fail_bdi: 497 bdi_destroy(&fsc->backing_dev_info); 498 fail_client: 499 ceph_destroy_client(fsc->client); 500 fail: 501 kfree(fsc); 502 return ERR_PTR(err); 503 } 504 505 static void destroy_fs_client(struct ceph_fs_client *fsc) 506 { 507 dout("destroy_fs_client %p\n", fsc); 508 509 destroy_workqueue(fsc->wb_wq); 510 destroy_workqueue(fsc->pg_inv_wq); 511 destroy_workqueue(fsc->trunc_wq); 512 513 bdi_destroy(&fsc->backing_dev_info); 514 515 mempool_destroy(fsc->wb_pagevec_pool); 516 517 destroy_mount_options(fsc->mount_options); 518 519 ceph_fs_debugfs_cleanup(fsc); 520 521 ceph_destroy_client(fsc->client); 522 523 kfree(fsc); 524 dout("destroy_fs_client %p done\n", fsc); 525 } 526 527 /* 528 * caches 529 */ 530 struct kmem_cache *ceph_inode_cachep; 531 struct kmem_cache *ceph_cap_cachep; 532 struct kmem_cache *ceph_dentry_cachep; 533 struct kmem_cache *ceph_file_cachep; 534 535 static void ceph_inode_init_once(void *foo) 536 { 537 struct ceph_inode_info *ci = foo; 538 inode_init_once(&ci->vfs_inode); 539 } 540 541 static int __init init_caches(void) 542 { 543 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 544 sizeof(struct ceph_inode_info), 545 __alignof__(struct ceph_inode_info), 546 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 547 ceph_inode_init_once); 548 if (ceph_inode_cachep == NULL) 549 return -ENOMEM; 550 551 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 552 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 553 if (ceph_cap_cachep == NULL) 554 goto bad_cap; 555 556 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 557 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 558 if (ceph_dentry_cachep == NULL) 559 goto bad_dentry; 560 561 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 562 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 563 if (ceph_file_cachep == NULL) 564 goto bad_file; 565 566 return 0; 567 568 bad_file: 569 kmem_cache_destroy(ceph_dentry_cachep); 570 bad_dentry: 571 kmem_cache_destroy(ceph_cap_cachep); 572 bad_cap: 573 kmem_cache_destroy(ceph_inode_cachep); 574 return -ENOMEM; 575 } 576 577 static void destroy_caches(void) 578 { 579 kmem_cache_destroy(ceph_inode_cachep); 580 kmem_cache_destroy(ceph_cap_cachep); 581 kmem_cache_destroy(ceph_dentry_cachep); 582 kmem_cache_destroy(ceph_file_cachep); 583 } 584 585 586 /* 587 * ceph_umount_begin - initiate forced umount. Tear down down the 588 * mount, skipping steps that may hang while waiting for server(s). 589 */ 590 static void ceph_umount_begin(struct super_block *sb) 591 { 592 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 593 594 dout("ceph_umount_begin - starting forced umount\n"); 595 if (!fsc) 596 return; 597 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 598 return; 599 } 600 601 static const struct super_operations ceph_super_ops = { 602 .alloc_inode = ceph_alloc_inode, 603 .destroy_inode = ceph_destroy_inode, 604 .write_inode = ceph_write_inode, 605 .sync_fs = ceph_sync_fs, 606 .put_super = ceph_put_super, 607 .show_options = ceph_show_options, 608 .statfs = ceph_statfs, 609 .umount_begin = ceph_umount_begin, 610 }; 611 612 /* 613 * Bootstrap mount by opening the root directory. Note the mount 614 * @started time from caller, and time out if this takes too long. 615 */ 616 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 617 const char *path, 618 unsigned long started) 619 { 620 struct ceph_mds_client *mdsc = fsc->mdsc; 621 struct ceph_mds_request *req = NULL; 622 int err; 623 struct dentry *root; 624 625 /* open dir */ 626 dout("open_root_inode opening '%s'\n", path); 627 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 628 if (IS_ERR(req)) 629 return ERR_CAST(req); 630 req->r_path1 = kstrdup(path, GFP_NOFS); 631 req->r_ino1.ino = CEPH_INO_ROOT; 632 req->r_ino1.snap = CEPH_NOSNAP; 633 req->r_started = started; 634 req->r_timeout = fsc->client->options->mount_timeout * HZ; 635 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 636 req->r_num_caps = 2; 637 err = ceph_mdsc_do_request(mdsc, NULL, req); 638 if (err == 0) { 639 dout("open_root_inode success\n"); 640 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && 641 fsc->sb->s_root == NULL) { 642 root = d_alloc_root(req->r_target_inode); 643 ceph_init_dentry(root); 644 } else { 645 root = d_obtain_alias(req->r_target_inode); 646 } 647 req->r_target_inode = NULL; 648 dout("open_root_inode success, root dentry is %p\n", root); 649 } else { 650 root = ERR_PTR(err); 651 } 652 ceph_mdsc_put_request(req); 653 return root; 654 } 655 656 657 658 659 /* 660 * mount: join the ceph cluster, and open root directory. 661 */ 662 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc, 663 const char *path) 664 { 665 int err; 666 unsigned long started = jiffies; /* note the start time */ 667 struct dentry *root; 668 int first = 0; /* first vfsmount for this super_block */ 669 670 dout("mount start\n"); 671 mutex_lock(&fsc->client->mount_mutex); 672 673 err = __ceph_open_session(fsc->client, started); 674 if (err < 0) 675 goto out; 676 677 dout("mount opening root\n"); 678 root = open_root_dentry(fsc, "", started); 679 if (IS_ERR(root)) { 680 err = PTR_ERR(root); 681 goto out; 682 } 683 if (fsc->sb->s_root) { 684 dput(root); 685 } else { 686 fsc->sb->s_root = root; 687 first = 1; 688 689 err = ceph_fs_debugfs_init(fsc); 690 if (err < 0) 691 goto fail; 692 } 693 694 if (path[0] == 0) { 695 dget(root); 696 } else { 697 dout("mount opening base mountpoint\n"); 698 root = open_root_dentry(fsc, path, started); 699 if (IS_ERR(root)) { 700 err = PTR_ERR(root); 701 goto fail; 702 } 703 } 704 705 fsc->mount_state = CEPH_MOUNT_MOUNTED; 706 dout("mount success\n"); 707 mutex_unlock(&fsc->client->mount_mutex); 708 return root; 709 710 out: 711 mutex_unlock(&fsc->client->mount_mutex); 712 return ERR_PTR(err); 713 714 fail: 715 if (first) { 716 dput(fsc->sb->s_root); 717 fsc->sb->s_root = NULL; 718 } 719 goto out; 720 } 721 722 static int ceph_set_super(struct super_block *s, void *data) 723 { 724 struct ceph_fs_client *fsc = data; 725 int ret; 726 727 dout("set_super %p data %p\n", s, data); 728 729 s->s_flags = fsc->mount_options->sb_flags; 730 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 731 732 s->s_fs_info = fsc; 733 fsc->sb = s; 734 735 s->s_op = &ceph_super_ops; 736 s->s_export_op = &ceph_export_ops; 737 738 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 739 740 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 741 if (ret != 0) 742 goto fail; 743 744 return ret; 745 746 fail: 747 s->s_fs_info = NULL; 748 fsc->sb = NULL; 749 return ret; 750 } 751 752 /* 753 * share superblock if same fs AND options 754 */ 755 static int ceph_compare_super(struct super_block *sb, void *data) 756 { 757 struct ceph_fs_client *new = data; 758 struct ceph_mount_options *fsopt = new->mount_options; 759 struct ceph_options *opt = new->client->options; 760 struct ceph_fs_client *other = ceph_sb_to_client(sb); 761 762 dout("ceph_compare_super %p\n", sb); 763 764 if (compare_mount_options(fsopt, opt, other)) { 765 dout("monitor(s)/mount options don't match\n"); 766 return 0; 767 } 768 if ((opt->flags & CEPH_OPT_FSID) && 769 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 770 dout("fsid doesn't match\n"); 771 return 0; 772 } 773 if (fsopt->sb_flags != other->mount_options->sb_flags) { 774 dout("flags differ\n"); 775 return 0; 776 } 777 return 1; 778 } 779 780 /* 781 * construct our own bdi so we can control readahead, etc. 782 */ 783 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 784 785 static int ceph_register_bdi(struct super_block *sb, 786 struct ceph_fs_client *fsc) 787 { 788 int err; 789 790 /* set ra_pages based on rasize mount option? */ 791 if (fsc->mount_options->rasize >= PAGE_CACHE_SIZE) 792 fsc->backing_dev_info.ra_pages = 793 (fsc->mount_options->rasize + PAGE_CACHE_SIZE - 1) 794 >> PAGE_SHIFT; 795 else 796 fsc->backing_dev_info.ra_pages = 797 default_backing_dev_info.ra_pages; 798 799 err = bdi_register(&fsc->backing_dev_info, NULL, "ceph-%d", 800 atomic_long_inc_return(&bdi_seq)); 801 if (!err) 802 sb->s_bdi = &fsc->backing_dev_info; 803 return err; 804 } 805 806 static struct dentry *ceph_mount(struct file_system_type *fs_type, 807 int flags, const char *dev_name, void *data) 808 { 809 struct super_block *sb; 810 struct ceph_fs_client *fsc; 811 struct dentry *res; 812 int err; 813 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 814 const char *path = NULL; 815 struct ceph_mount_options *fsopt = NULL; 816 struct ceph_options *opt = NULL; 817 818 dout("ceph_mount\n"); 819 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name, &path); 820 if (err < 0) { 821 res = ERR_PTR(err); 822 goto out_final; 823 } 824 825 /* create client (which we may/may not use) */ 826 fsc = create_fs_client(fsopt, opt); 827 if (IS_ERR(fsc)) { 828 res = ERR_CAST(fsc); 829 destroy_mount_options(fsopt); 830 ceph_destroy_options(opt); 831 goto out_final; 832 } 833 834 err = ceph_mdsc_init(fsc); 835 if (err < 0) { 836 res = ERR_PTR(err); 837 goto out; 838 } 839 840 if (ceph_test_opt(fsc->client, NOSHARE)) 841 compare_super = NULL; 842 sb = sget(fs_type, compare_super, ceph_set_super, fsc); 843 if (IS_ERR(sb)) { 844 res = ERR_CAST(sb); 845 goto out; 846 } 847 848 if (ceph_sb_to_client(sb) != fsc) { 849 ceph_mdsc_destroy(fsc); 850 destroy_fs_client(fsc); 851 fsc = ceph_sb_to_client(sb); 852 dout("get_sb got existing client %p\n", fsc); 853 } else { 854 dout("get_sb using new client %p\n", fsc); 855 err = ceph_register_bdi(sb, fsc); 856 if (err < 0) { 857 res = ERR_PTR(err); 858 goto out_splat; 859 } 860 } 861 862 res = ceph_real_mount(fsc, path); 863 if (IS_ERR(res)) 864 goto out_splat; 865 dout("root %p inode %p ino %llx.%llx\n", res, 866 res->d_inode, ceph_vinop(res->d_inode)); 867 return res; 868 869 out_splat: 870 ceph_mdsc_close_sessions(fsc->mdsc); 871 deactivate_locked_super(sb); 872 goto out_final; 873 874 out: 875 ceph_mdsc_destroy(fsc); 876 destroy_fs_client(fsc); 877 out_final: 878 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 879 return res; 880 } 881 882 static void ceph_kill_sb(struct super_block *s) 883 { 884 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 885 dout("kill_sb %p\n", s); 886 ceph_mdsc_pre_umount(fsc->mdsc); 887 kill_anon_super(s); /* will call put_super after sb is r/o */ 888 ceph_mdsc_destroy(fsc); 889 destroy_fs_client(fsc); 890 } 891 892 static struct file_system_type ceph_fs_type = { 893 .owner = THIS_MODULE, 894 .name = "ceph", 895 .mount = ceph_mount, 896 .kill_sb = ceph_kill_sb, 897 .fs_flags = FS_RENAME_DOES_D_MOVE, 898 }; 899 900 #define _STRINGIFY(x) #x 901 #define STRINGIFY(x) _STRINGIFY(x) 902 903 static int __init init_ceph(void) 904 { 905 int ret = init_caches(); 906 if (ret) 907 goto out; 908 909 ret = register_filesystem(&ceph_fs_type); 910 if (ret) 911 goto out_icache; 912 913 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 914 915 return 0; 916 917 out_icache: 918 destroy_caches(); 919 out: 920 return ret; 921 } 922 923 static void __exit exit_ceph(void) 924 { 925 dout("exit_ceph\n"); 926 unregister_filesystem(&ceph_fs_type); 927 destroy_caches(); 928 } 929 930 module_init(init_ceph); 931 module_exit(exit_ceph); 932 933 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 934 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 935 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 936 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 937 MODULE_LICENSE("GPL"); 938