1 2 #include "ceph_debug.h" 3 4 #include <linux/backing-dev.h> 5 #include <linux/fs.h> 6 #include <linux/inet.h> 7 #include <linux/in6.h> 8 #include <linux/module.h> 9 #include <linux/mount.h> 10 #include <linux/parser.h> 11 #include <linux/rwsem.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 #include <linux/version.h> 18 #include <linux/vmalloc.h> 19 20 #include "decode.h" 21 #include "super.h" 22 #include "mon_client.h" 23 #include "auth.h" 24 25 /* 26 * Ceph superblock operations 27 * 28 * Handle the basics of mounting, unmounting. 29 */ 30 31 32 /* 33 * find filename portion of a path (/foo/bar/baz -> baz) 34 */ 35 const char *ceph_file_part(const char *s, int len) 36 { 37 const char *e = s + len; 38 39 while (e != s && *(e-1) != '/') 40 e--; 41 return e; 42 } 43 44 45 /* 46 * super ops 47 */ 48 static void ceph_put_super(struct super_block *s) 49 { 50 struct ceph_client *cl = ceph_client(s); 51 52 dout("put_super\n"); 53 ceph_mdsc_close_sessions(&cl->mdsc); 54 return; 55 } 56 57 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 58 { 59 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode); 60 struct ceph_monmap *monmap = client->monc.monmap; 61 struct ceph_statfs st; 62 u64 fsid; 63 int err; 64 65 dout("statfs\n"); 66 err = ceph_monc_do_statfs(&client->monc, &st); 67 if (err < 0) 68 return err; 69 70 /* fill in kstatfs */ 71 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 72 73 /* 74 * express utilization in terms of large blocks to avoid 75 * overflow on 32-bit machines. 76 */ 77 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 78 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 79 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >> 80 (CEPH_BLOCK_SHIFT-10); 81 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 82 83 buf->f_files = le64_to_cpu(st.num_objects); 84 buf->f_ffree = -1; 85 buf->f_namelen = PATH_MAX; 86 buf->f_frsize = PAGE_CACHE_SIZE; 87 88 /* leave fsid little-endian, regardless of host endianness */ 89 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 90 buf->f_fsid.val[0] = fsid & 0xffffffff; 91 buf->f_fsid.val[1] = fsid >> 32; 92 93 return 0; 94 } 95 96 97 static int ceph_syncfs(struct super_block *sb, int wait) 98 { 99 dout("sync_fs %d\n", wait); 100 ceph_osdc_sync(&ceph_client(sb)->osdc); 101 ceph_mdsc_sync(&ceph_client(sb)->mdsc); 102 dout("sync_fs %d done\n", wait); 103 return 0; 104 } 105 106 107 /** 108 * ceph_show_options - Show mount options in /proc/mounts 109 * @m: seq_file to write to 110 * @mnt: mount descriptor 111 */ 112 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) 113 { 114 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb); 115 struct ceph_mount_args *args = client->mount_args; 116 117 if (args->flags & CEPH_OPT_FSID) 118 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu", 119 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]), 120 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8])); 121 if (args->flags & CEPH_OPT_NOSHARE) 122 seq_puts(m, ",noshare"); 123 if (args->flags & CEPH_OPT_DIRSTAT) 124 seq_puts(m, ",dirstat"); 125 if ((args->flags & CEPH_OPT_RBYTES) == 0) 126 seq_puts(m, ",norbytes"); 127 if (args->flags & CEPH_OPT_NOCRC) 128 seq_puts(m, ",nocrc"); 129 if (args->flags & CEPH_OPT_NOASYNCREADDIR) 130 seq_puts(m, ",noasyncreaddir"); 131 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 132 seq_printf(m, ",snapdirname=%s", args->snapdir_name); 133 if (args->name) 134 seq_printf(m, ",name=%s", args->name); 135 if (args->secret) 136 seq_puts(m, ",secret=<hidden>"); 137 return 0; 138 } 139 140 /* 141 * caches 142 */ 143 struct kmem_cache *ceph_inode_cachep; 144 struct kmem_cache *ceph_cap_cachep; 145 struct kmem_cache *ceph_dentry_cachep; 146 struct kmem_cache *ceph_file_cachep; 147 148 static void ceph_inode_init_once(void *foo) 149 { 150 struct ceph_inode_info *ci = foo; 151 inode_init_once(&ci->vfs_inode); 152 } 153 154 static int default_congestion_kb(void) 155 { 156 int congestion_kb; 157 158 /* 159 * Copied from NFS 160 * 161 * congestion size, scale with available memory. 162 * 163 * 64MB: 8192k 164 * 128MB: 11585k 165 * 256MB: 16384k 166 * 512MB: 23170k 167 * 1GB: 32768k 168 * 2GB: 46340k 169 * 4GB: 65536k 170 * 8GB: 92681k 171 * 16GB: 131072k 172 * 173 * This allows larger machines to have larger/more transfers. 174 * Limit the default to 256M 175 */ 176 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 177 if (congestion_kb > 256*1024) 178 congestion_kb = 256*1024; 179 180 return congestion_kb; 181 } 182 183 static int __init init_caches(void) 184 { 185 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 186 sizeof(struct ceph_inode_info), 187 __alignof__(struct ceph_inode_info), 188 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 189 ceph_inode_init_once); 190 if (ceph_inode_cachep == NULL) 191 return -ENOMEM; 192 193 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 194 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 195 if (ceph_cap_cachep == NULL) 196 goto bad_cap; 197 198 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 199 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 200 if (ceph_dentry_cachep == NULL) 201 goto bad_dentry; 202 203 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 204 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 205 if (ceph_file_cachep == NULL) 206 goto bad_file; 207 208 return 0; 209 210 bad_file: 211 kmem_cache_destroy(ceph_dentry_cachep); 212 bad_dentry: 213 kmem_cache_destroy(ceph_cap_cachep); 214 bad_cap: 215 kmem_cache_destroy(ceph_inode_cachep); 216 return -ENOMEM; 217 } 218 219 static void destroy_caches(void) 220 { 221 kmem_cache_destroy(ceph_inode_cachep); 222 kmem_cache_destroy(ceph_cap_cachep); 223 kmem_cache_destroy(ceph_dentry_cachep); 224 kmem_cache_destroy(ceph_file_cachep); 225 } 226 227 228 /* 229 * ceph_umount_begin - initiate forced umount. Tear down down the 230 * mount, skipping steps that may hang while waiting for server(s). 231 */ 232 static void ceph_umount_begin(struct super_block *sb) 233 { 234 struct ceph_client *client = ceph_sb_to_client(sb); 235 236 dout("ceph_umount_begin - starting forced umount\n"); 237 if (!client) 238 return; 239 client->mount_state = CEPH_MOUNT_SHUTDOWN; 240 return; 241 } 242 243 static const struct super_operations ceph_super_ops = { 244 .alloc_inode = ceph_alloc_inode, 245 .destroy_inode = ceph_destroy_inode, 246 .write_inode = ceph_write_inode, 247 .sync_fs = ceph_syncfs, 248 .put_super = ceph_put_super, 249 .show_options = ceph_show_options, 250 .statfs = ceph_statfs, 251 .umount_begin = ceph_umount_begin, 252 }; 253 254 255 const char *ceph_msg_type_name(int type) 256 { 257 switch (type) { 258 case CEPH_MSG_SHUTDOWN: return "shutdown"; 259 case CEPH_MSG_PING: return "ping"; 260 case CEPH_MSG_AUTH: return "auth"; 261 case CEPH_MSG_AUTH_REPLY: return "auth_reply"; 262 case CEPH_MSG_MON_MAP: return "mon_map"; 263 case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; 264 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; 265 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; 266 case CEPH_MSG_STATFS: return "statfs"; 267 case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; 268 case CEPH_MSG_MDS_MAP: return "mds_map"; 269 case CEPH_MSG_CLIENT_SESSION: return "client_session"; 270 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; 271 case CEPH_MSG_CLIENT_REQUEST: return "client_request"; 272 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; 273 case CEPH_MSG_CLIENT_REPLY: return "client_reply"; 274 case CEPH_MSG_CLIENT_CAPS: return "client_caps"; 275 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; 276 case CEPH_MSG_CLIENT_SNAP: return "client_snap"; 277 case CEPH_MSG_CLIENT_LEASE: return "client_lease"; 278 case CEPH_MSG_OSD_MAP: return "osd_map"; 279 case CEPH_MSG_OSD_OP: return "osd_op"; 280 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; 281 default: return "unknown"; 282 } 283 } 284 285 286 /* 287 * mount options 288 */ 289 enum { 290 Opt_fsidmajor, 291 Opt_fsidminor, 292 Opt_monport, 293 Opt_wsize, 294 Opt_rsize, 295 Opt_osdtimeout, 296 Opt_osdkeepalivetimeout, 297 Opt_mount_timeout, 298 Opt_osd_idle_ttl, 299 Opt_caps_wanted_delay_min, 300 Opt_caps_wanted_delay_max, 301 Opt_readdir_max_entries, 302 Opt_congestion_kb, 303 Opt_last_int, 304 /* int args above */ 305 Opt_snapdirname, 306 Opt_name, 307 Opt_secret, 308 Opt_last_string, 309 /* string args above */ 310 Opt_ip, 311 Opt_noshare, 312 Opt_dirstat, 313 Opt_nodirstat, 314 Opt_rbytes, 315 Opt_norbytes, 316 Opt_nocrc, 317 Opt_noasyncreaddir, 318 }; 319 320 static match_table_t arg_tokens = { 321 {Opt_fsidmajor, "fsidmajor=%ld"}, 322 {Opt_fsidminor, "fsidminor=%ld"}, 323 {Opt_monport, "monport=%d"}, 324 {Opt_wsize, "wsize=%d"}, 325 {Opt_rsize, "rsize=%d"}, 326 {Opt_osdtimeout, "osdtimeout=%d"}, 327 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, 328 {Opt_mount_timeout, "mount_timeout=%d"}, 329 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"}, 330 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 331 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 332 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 333 {Opt_congestion_kb, "write_congestion_kb=%d"}, 334 /* int args above */ 335 {Opt_snapdirname, "snapdirname=%s"}, 336 {Opt_name, "name=%s"}, 337 {Opt_secret, "secret=%s"}, 338 /* string args above */ 339 {Opt_ip, "ip=%s"}, 340 {Opt_noshare, "noshare"}, 341 {Opt_dirstat, "dirstat"}, 342 {Opt_nodirstat, "nodirstat"}, 343 {Opt_rbytes, "rbytes"}, 344 {Opt_norbytes, "norbytes"}, 345 {Opt_nocrc, "nocrc"}, 346 {Opt_noasyncreaddir, "noasyncreaddir"}, 347 {-1, NULL} 348 }; 349 350 351 static struct ceph_mount_args *parse_mount_args(int flags, char *options, 352 const char *dev_name, 353 const char **path) 354 { 355 struct ceph_mount_args *args; 356 const char *c; 357 int err = -ENOMEM; 358 substring_t argstr[MAX_OPT_ARGS]; 359 360 args = kzalloc(sizeof(*args), GFP_KERNEL); 361 if (!args) 362 return ERR_PTR(-ENOMEM); 363 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr), 364 GFP_KERNEL); 365 if (!args->mon_addr) 366 goto out; 367 368 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name); 369 370 /* start with defaults */ 371 args->sb_flags = flags; 372 args->flags = CEPH_OPT_DEFAULT; 373 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT; 374 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; 375 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ 376 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ 377 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 378 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 379 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT; 380 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 381 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4; 382 args->max_readdir = 1024; 383 args->congestion_kb = default_congestion_kb(); 384 385 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 386 err = -EINVAL; 387 if (!dev_name) 388 goto out; 389 *path = strstr(dev_name, ":/"); 390 if (*path == NULL) { 391 pr_err("device name is missing path (no :/ in %s)\n", 392 dev_name); 393 goto out; 394 } 395 396 /* get mon ip(s) */ 397 err = ceph_parse_ips(dev_name, *path, args->mon_addr, 398 CEPH_MAX_MON, &args->num_mon); 399 if (err < 0) 400 goto out; 401 402 /* path on server */ 403 *path += 2; 404 dout("server path '%s'\n", *path); 405 406 /* parse mount options */ 407 while ((c = strsep(&options, ",")) != NULL) { 408 int token, intval, ret; 409 if (!*c) 410 continue; 411 err = -EINVAL; 412 token = match_token((char *)c, arg_tokens, argstr); 413 if (token < 0) { 414 pr_err("bad mount option at '%s'\n", c); 415 goto out; 416 } 417 if (token < Opt_last_int) { 418 ret = match_int(&argstr[0], &intval); 419 if (ret < 0) { 420 pr_err("bad mount option arg (not int) " 421 "at '%s'\n", c); 422 continue; 423 } 424 dout("got int token %d val %d\n", token, intval); 425 } else if (token > Opt_last_int && token < Opt_last_string) { 426 dout("got string token %d val %s\n", token, 427 argstr[0].from); 428 } else { 429 dout("got token %d\n", token); 430 } 431 switch (token) { 432 case Opt_fsidmajor: 433 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval); 434 break; 435 case Opt_fsidminor: 436 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval); 437 break; 438 case Opt_ip: 439 err = ceph_parse_ips(argstr[0].from, 440 argstr[0].to, 441 &args->my_addr, 442 1, NULL); 443 if (err < 0) 444 goto out; 445 args->flags |= CEPH_OPT_MYIP; 446 break; 447 448 case Opt_snapdirname: 449 kfree(args->snapdir_name); 450 args->snapdir_name = kstrndup(argstr[0].from, 451 argstr[0].to-argstr[0].from, 452 GFP_KERNEL); 453 break; 454 case Opt_name: 455 args->name = kstrndup(argstr[0].from, 456 argstr[0].to-argstr[0].from, 457 GFP_KERNEL); 458 break; 459 case Opt_secret: 460 args->secret = kstrndup(argstr[0].from, 461 argstr[0].to-argstr[0].from, 462 GFP_KERNEL); 463 break; 464 465 /* misc */ 466 case Opt_wsize: 467 args->wsize = intval; 468 break; 469 case Opt_rsize: 470 args->rsize = intval; 471 break; 472 case Opt_osdtimeout: 473 args->osd_timeout = intval; 474 break; 475 case Opt_osdkeepalivetimeout: 476 args->osd_keepalive_timeout = intval; 477 break; 478 case Opt_mount_timeout: 479 args->mount_timeout = intval; 480 break; 481 case Opt_caps_wanted_delay_min: 482 args->caps_wanted_delay_min = intval; 483 break; 484 case Opt_caps_wanted_delay_max: 485 args->caps_wanted_delay_max = intval; 486 break; 487 case Opt_readdir_max_entries: 488 args->max_readdir = intval; 489 break; 490 case Opt_congestion_kb: 491 args->congestion_kb = intval; 492 break; 493 494 case Opt_noshare: 495 args->flags |= CEPH_OPT_NOSHARE; 496 break; 497 498 case Opt_dirstat: 499 args->flags |= CEPH_OPT_DIRSTAT; 500 break; 501 case Opt_nodirstat: 502 args->flags &= ~CEPH_OPT_DIRSTAT; 503 break; 504 case Opt_rbytes: 505 args->flags |= CEPH_OPT_RBYTES; 506 break; 507 case Opt_norbytes: 508 args->flags &= ~CEPH_OPT_RBYTES; 509 break; 510 case Opt_nocrc: 511 args->flags |= CEPH_OPT_NOCRC; 512 break; 513 case Opt_noasyncreaddir: 514 args->flags |= CEPH_OPT_NOASYNCREADDIR; 515 break; 516 517 default: 518 BUG_ON(token); 519 } 520 } 521 return args; 522 523 out: 524 kfree(args->mon_addr); 525 kfree(args); 526 return ERR_PTR(err); 527 } 528 529 static void destroy_mount_args(struct ceph_mount_args *args) 530 { 531 dout("destroy_mount_args %p\n", args); 532 kfree(args->snapdir_name); 533 args->snapdir_name = NULL; 534 kfree(args->name); 535 args->name = NULL; 536 kfree(args->secret); 537 args->secret = NULL; 538 kfree(args); 539 } 540 541 /* 542 * create a fresh client instance 543 */ 544 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) 545 { 546 struct ceph_client *client; 547 int err = -ENOMEM; 548 549 client = kzalloc(sizeof(*client), GFP_KERNEL); 550 if (client == NULL) 551 return ERR_PTR(-ENOMEM); 552 553 mutex_init(&client->mount_mutex); 554 555 init_waitqueue_head(&client->auth_wq); 556 557 client->sb = NULL; 558 client->mount_state = CEPH_MOUNT_MOUNTING; 559 client->mount_args = args; 560 561 client->msgr = NULL; 562 563 client->auth_err = 0; 564 atomic_long_set(&client->writeback_count, 0); 565 566 err = bdi_init(&client->backing_dev_info); 567 if (err < 0) 568 goto fail; 569 570 err = -ENOMEM; 571 client->wb_wq = create_workqueue("ceph-writeback"); 572 if (client->wb_wq == NULL) 573 goto fail_bdi; 574 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid"); 575 if (client->pg_inv_wq == NULL) 576 goto fail_wb_wq; 577 client->trunc_wq = create_singlethread_workqueue("ceph-trunc"); 578 if (client->trunc_wq == NULL) 579 goto fail_pg_inv_wq; 580 581 /* set up mempools */ 582 err = -ENOMEM; 583 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 584 client->mount_args->wsize >> PAGE_CACHE_SHIFT); 585 if (!client->wb_pagevec_pool) 586 goto fail_trunc_wq; 587 588 /* caps */ 589 client->min_caps = args->max_readdir; 590 ceph_adjust_min_caps(client->min_caps); 591 592 /* subsystems */ 593 err = ceph_monc_init(&client->monc, client); 594 if (err < 0) 595 goto fail_mempool; 596 err = ceph_osdc_init(&client->osdc, client); 597 if (err < 0) 598 goto fail_monc; 599 err = ceph_mdsc_init(&client->mdsc, client); 600 if (err < 0) 601 goto fail_osdc; 602 return client; 603 604 fail_osdc: 605 ceph_osdc_stop(&client->osdc); 606 fail_monc: 607 ceph_monc_stop(&client->monc); 608 fail_mempool: 609 mempool_destroy(client->wb_pagevec_pool); 610 fail_trunc_wq: 611 destroy_workqueue(client->trunc_wq); 612 fail_pg_inv_wq: 613 destroy_workqueue(client->pg_inv_wq); 614 fail_wb_wq: 615 destroy_workqueue(client->wb_wq); 616 fail_bdi: 617 bdi_destroy(&client->backing_dev_info); 618 fail: 619 kfree(client); 620 return ERR_PTR(err); 621 } 622 623 static void ceph_destroy_client(struct ceph_client *client) 624 { 625 dout("destroy_client %p\n", client); 626 627 /* unmount */ 628 ceph_mdsc_stop(&client->mdsc); 629 ceph_monc_stop(&client->monc); 630 ceph_osdc_stop(&client->osdc); 631 632 ceph_adjust_min_caps(-client->min_caps); 633 634 ceph_debugfs_client_cleanup(client); 635 destroy_workqueue(client->wb_wq); 636 destroy_workqueue(client->pg_inv_wq); 637 destroy_workqueue(client->trunc_wq); 638 639 if (client->msgr) 640 ceph_messenger_destroy(client->msgr); 641 mempool_destroy(client->wb_pagevec_pool); 642 643 destroy_mount_args(client->mount_args); 644 645 kfree(client); 646 dout("destroy_client %p done\n", client); 647 } 648 649 /* 650 * Initially learn our fsid, or verify an fsid matches. 651 */ 652 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) 653 { 654 if (client->have_fsid) { 655 if (ceph_fsid_compare(&client->fsid, fsid)) { 656 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT, 657 PR_FSID(&client->fsid), PR_FSID(fsid)); 658 return -1; 659 } 660 } else { 661 pr_info("client%lld fsid " FSID_FORMAT "\n", 662 client->monc.auth->global_id, PR_FSID(fsid)); 663 memcpy(&client->fsid, fsid, sizeof(*fsid)); 664 ceph_debugfs_client_init(client); 665 client->have_fsid = true; 666 } 667 return 0; 668 } 669 670 /* 671 * true if we have the mon map (and have thus joined the cluster) 672 */ 673 static int have_mon_map(struct ceph_client *client) 674 { 675 return client->monc.monmap && client->monc.monmap->epoch; 676 } 677 678 /* 679 * Bootstrap mount by opening the root directory. Note the mount 680 * @started time from caller, and time out if this takes too long. 681 */ 682 static struct dentry *open_root_dentry(struct ceph_client *client, 683 const char *path, 684 unsigned long started) 685 { 686 struct ceph_mds_client *mdsc = &client->mdsc; 687 struct ceph_mds_request *req = NULL; 688 int err; 689 struct dentry *root; 690 691 /* open dir */ 692 dout("open_root_inode opening '%s'\n", path); 693 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 694 if (IS_ERR(req)) 695 return ERR_PTR(PTR_ERR(req)); 696 req->r_path1 = kstrdup(path, GFP_NOFS); 697 req->r_ino1.ino = CEPH_INO_ROOT; 698 req->r_ino1.snap = CEPH_NOSNAP; 699 req->r_started = started; 700 req->r_timeout = client->mount_args->mount_timeout * HZ; 701 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 702 req->r_num_caps = 2; 703 err = ceph_mdsc_do_request(mdsc, NULL, req); 704 if (err == 0) { 705 dout("open_root_inode success\n"); 706 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && 707 client->sb->s_root == NULL) 708 root = d_alloc_root(req->r_target_inode); 709 else 710 root = d_obtain_alias(req->r_target_inode); 711 req->r_target_inode = NULL; 712 dout("open_root_inode success, root dentry is %p\n", root); 713 } else { 714 root = ERR_PTR(err); 715 } 716 ceph_mdsc_put_request(req); 717 return root; 718 } 719 720 /* 721 * mount: join the ceph cluster, and open root directory. 722 */ 723 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt, 724 const char *path) 725 { 726 struct ceph_entity_addr *myaddr = NULL; 727 int err; 728 unsigned long timeout = client->mount_args->mount_timeout * HZ; 729 unsigned long started = jiffies; /* note the start time */ 730 struct dentry *root; 731 732 dout("mount start\n"); 733 mutex_lock(&client->mount_mutex); 734 735 /* initialize the messenger */ 736 if (client->msgr == NULL) { 737 if (ceph_test_opt(client, MYIP)) 738 myaddr = &client->mount_args->my_addr; 739 client->msgr = ceph_messenger_create(myaddr); 740 if (IS_ERR(client->msgr)) { 741 err = PTR_ERR(client->msgr); 742 client->msgr = NULL; 743 goto out; 744 } 745 client->msgr->nocrc = ceph_test_opt(client, NOCRC); 746 } 747 748 /* open session, and wait for mon, mds, and osd maps */ 749 err = ceph_monc_open_session(&client->monc); 750 if (err < 0) 751 goto out; 752 753 while (!have_mon_map(client)) { 754 err = -EIO; 755 if (timeout && time_after_eq(jiffies, started + timeout)) 756 goto out; 757 758 /* wait */ 759 dout("mount waiting for mon_map\n"); 760 err = wait_event_interruptible_timeout(client->auth_wq, 761 have_mon_map(client) || (client->auth_err < 0), 762 timeout); 763 if (err == -EINTR || err == -ERESTARTSYS) 764 goto out; 765 if (client->auth_err < 0) { 766 err = client->auth_err; 767 goto out; 768 } 769 } 770 771 dout("mount opening root\n"); 772 root = open_root_dentry(client, "", started); 773 if (IS_ERR(root)) { 774 err = PTR_ERR(root); 775 goto out; 776 } 777 if (client->sb->s_root) 778 dput(root); 779 else 780 client->sb->s_root = root; 781 782 if (path[0] == 0) { 783 dget(root); 784 } else { 785 dout("mount opening base mountpoint\n"); 786 root = open_root_dentry(client, path, started); 787 if (IS_ERR(root)) { 788 err = PTR_ERR(root); 789 dput(client->sb->s_root); 790 client->sb->s_root = NULL; 791 goto out; 792 } 793 } 794 795 mnt->mnt_root = root; 796 mnt->mnt_sb = client->sb; 797 798 client->mount_state = CEPH_MOUNT_MOUNTED; 799 dout("mount success\n"); 800 err = 0; 801 802 out: 803 mutex_unlock(&client->mount_mutex); 804 return err; 805 } 806 807 static int ceph_set_super(struct super_block *s, void *data) 808 { 809 struct ceph_client *client = data; 810 int ret; 811 812 dout("set_super %p data %p\n", s, data); 813 814 s->s_flags = client->mount_args->sb_flags; 815 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 816 817 s->s_fs_info = client; 818 client->sb = s; 819 820 s->s_op = &ceph_super_ops; 821 s->s_export_op = &ceph_export_ops; 822 823 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 824 825 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 826 if (ret != 0) 827 goto fail; 828 829 return ret; 830 831 fail: 832 s->s_fs_info = NULL; 833 client->sb = NULL; 834 return ret; 835 } 836 837 /* 838 * share superblock if same fs AND options 839 */ 840 static int ceph_compare_super(struct super_block *sb, void *data) 841 { 842 struct ceph_client *new = data; 843 struct ceph_mount_args *args = new->mount_args; 844 struct ceph_client *other = ceph_sb_to_client(sb); 845 int i; 846 847 dout("ceph_compare_super %p\n", sb); 848 if (args->flags & CEPH_OPT_FSID) { 849 if (ceph_fsid_compare(&args->fsid, &other->fsid)) { 850 dout("fsid doesn't match\n"); 851 return 0; 852 } 853 } else { 854 /* do we share (a) monitor? */ 855 for (i = 0; i < new->monc.monmap->num_mon; i++) 856 if (ceph_monmap_contains(other->monc.monmap, 857 &new->monc.monmap->mon_inst[i].addr)) 858 break; 859 if (i == new->monc.monmap->num_mon) { 860 dout("mon ip not part of monmap\n"); 861 return 0; 862 } 863 dout("mon ip matches existing sb %p\n", sb); 864 } 865 if (args->sb_flags != other->mount_args->sb_flags) { 866 dout("flags differ\n"); 867 return 0; 868 } 869 return 1; 870 } 871 872 /* 873 * construct our own bdi so we can control readahead, etc. 874 */ 875 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client) 876 { 877 int err; 878 879 sb->s_bdi = &client->backing_dev_info; 880 881 /* set ra_pages based on rsize mount option? */ 882 if (client->mount_args->rsize >= PAGE_CACHE_SIZE) 883 client->backing_dev_info.ra_pages = 884 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1) 885 >> PAGE_SHIFT; 886 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev); 887 return err; 888 } 889 890 static int ceph_get_sb(struct file_system_type *fs_type, 891 int flags, const char *dev_name, void *data, 892 struct vfsmount *mnt) 893 { 894 struct super_block *sb; 895 struct ceph_client *client; 896 int err; 897 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 898 const char *path = NULL; 899 struct ceph_mount_args *args; 900 901 dout("ceph_get_sb\n"); 902 args = parse_mount_args(flags, data, dev_name, &path); 903 if (IS_ERR(args)) { 904 err = PTR_ERR(args); 905 goto out_final; 906 } 907 908 /* create client (which we may/may not use) */ 909 client = ceph_create_client(args); 910 if (IS_ERR(client)) { 911 err = PTR_ERR(client); 912 goto out_final; 913 } 914 915 if (client->mount_args->flags & CEPH_OPT_NOSHARE) 916 compare_super = NULL; 917 sb = sget(fs_type, compare_super, ceph_set_super, client); 918 if (IS_ERR(sb)) { 919 err = PTR_ERR(sb); 920 goto out; 921 } 922 923 if (ceph_client(sb) != client) { 924 ceph_destroy_client(client); 925 client = ceph_client(sb); 926 dout("get_sb got existing client %p\n", client); 927 } else { 928 dout("get_sb using new client %p\n", client); 929 err = ceph_register_bdi(sb, client); 930 if (err < 0) 931 goto out_splat; 932 } 933 934 err = ceph_mount(client, mnt, path); 935 if (err < 0) 936 goto out_splat; 937 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root, 938 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode)); 939 return 0; 940 941 out_splat: 942 ceph_mdsc_close_sessions(&client->mdsc); 943 up_write(&sb->s_umount); 944 deactivate_super(sb); 945 goto out_final; 946 947 out: 948 ceph_destroy_client(client); 949 out_final: 950 dout("ceph_get_sb fail %d\n", err); 951 return err; 952 } 953 954 static void ceph_kill_sb(struct super_block *s) 955 { 956 struct ceph_client *client = ceph_sb_to_client(s); 957 dout("kill_sb %p\n", s); 958 ceph_mdsc_pre_umount(&client->mdsc); 959 kill_anon_super(s); /* will call put_super after sb is r/o */ 960 if (s->s_bdi == &client->backing_dev_info) 961 bdi_unregister(&client->backing_dev_info); 962 bdi_destroy(&client->backing_dev_info); 963 ceph_destroy_client(client); 964 } 965 966 static struct file_system_type ceph_fs_type = { 967 .owner = THIS_MODULE, 968 .name = "ceph", 969 .get_sb = ceph_get_sb, 970 .kill_sb = ceph_kill_sb, 971 .fs_flags = FS_RENAME_DOES_D_MOVE, 972 }; 973 974 #define _STRINGIFY(x) #x 975 #define STRINGIFY(x) _STRINGIFY(x) 976 977 static int __init init_ceph(void) 978 { 979 int ret = 0; 980 981 ret = ceph_debugfs_init(); 982 if (ret < 0) 983 goto out; 984 985 ret = ceph_msgr_init(); 986 if (ret < 0) 987 goto out_debugfs; 988 989 ret = init_caches(); 990 if (ret) 991 goto out_msgr; 992 993 ceph_caps_init(); 994 995 ret = register_filesystem(&ceph_fs_type); 996 if (ret) 997 goto out_icache; 998 999 pr_info("loaded %d.%d.%d (mon/mds/osd proto %d/%d/%d)\n", 1000 CEPH_VERSION_MAJOR, CEPH_VERSION_MINOR, CEPH_VERSION_PATCH, 1001 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL); 1002 return 0; 1003 1004 out_icache: 1005 destroy_caches(); 1006 out_msgr: 1007 ceph_msgr_exit(); 1008 out_debugfs: 1009 ceph_debugfs_cleanup(); 1010 out: 1011 return ret; 1012 } 1013 1014 static void __exit exit_ceph(void) 1015 { 1016 dout("exit_ceph\n"); 1017 unregister_filesystem(&ceph_fs_type); 1018 ceph_caps_finalize(); 1019 destroy_caches(); 1020 ceph_msgr_exit(); 1021 ceph_debugfs_cleanup(); 1022 } 1023 1024 module_init(init_ceph); 1025 module_exit(exit_ceph); 1026 1027 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1028 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1029 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1030 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1031 MODULE_LICENSE("GPL"); 1032