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 *client = ceph_sb_to_client(s); 51 52 dout("put_super\n"); 53 ceph_mdsc_close_sessions(&client->mdsc); 54 55 /* 56 * ensure we release the bdi before put_anon_super releases 57 * the device name. 58 */ 59 if (s->s_bdi == &client->backing_dev_info) { 60 bdi_unregister(&client->backing_dev_info); 61 s->s_bdi = NULL; 62 } 63 64 return; 65 } 66 67 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 68 { 69 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode); 70 struct ceph_monmap *monmap = client->monc.monmap; 71 struct ceph_statfs st; 72 u64 fsid; 73 int err; 74 75 dout("statfs\n"); 76 err = ceph_monc_do_statfs(&client->monc, &st); 77 if (err < 0) 78 return err; 79 80 /* fill in kstatfs */ 81 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 82 83 /* 84 * express utilization in terms of large blocks to avoid 85 * overflow on 32-bit machines. 86 */ 87 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 88 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 89 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >> 90 (CEPH_BLOCK_SHIFT-10); 91 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 92 93 buf->f_files = le64_to_cpu(st.num_objects); 94 buf->f_ffree = -1; 95 buf->f_namelen = PATH_MAX; 96 buf->f_frsize = PAGE_CACHE_SIZE; 97 98 /* leave fsid little-endian, regardless of host endianness */ 99 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 100 buf->f_fsid.val[0] = fsid & 0xffffffff; 101 buf->f_fsid.val[1] = fsid >> 32; 102 103 return 0; 104 } 105 106 107 static int ceph_syncfs(struct super_block *sb, int wait) 108 { 109 dout("sync_fs %d\n", wait); 110 ceph_osdc_sync(&ceph_client(sb)->osdc); 111 ceph_mdsc_sync(&ceph_client(sb)->mdsc); 112 dout("sync_fs %d done\n", wait); 113 return 0; 114 } 115 116 117 /** 118 * ceph_show_options - Show mount options in /proc/mounts 119 * @m: seq_file to write to 120 * @mnt: mount descriptor 121 */ 122 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) 123 { 124 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb); 125 struct ceph_mount_args *args = client->mount_args; 126 127 if (args->flags & CEPH_OPT_FSID) 128 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu", 129 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]), 130 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8])); 131 if (args->flags & CEPH_OPT_NOSHARE) 132 seq_puts(m, ",noshare"); 133 if (args->flags & CEPH_OPT_DIRSTAT) 134 seq_puts(m, ",dirstat"); 135 if ((args->flags & CEPH_OPT_RBYTES) == 0) 136 seq_puts(m, ",norbytes"); 137 if (args->flags & CEPH_OPT_NOCRC) 138 seq_puts(m, ",nocrc"); 139 if (args->flags & CEPH_OPT_NOASYNCREADDIR) 140 seq_puts(m, ",noasyncreaddir"); 141 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 142 seq_printf(m, ",snapdirname=%s", args->snapdir_name); 143 if (args->name) 144 seq_printf(m, ",name=%s", args->name); 145 if (args->secret) 146 seq_puts(m, ",secret=<hidden>"); 147 return 0; 148 } 149 150 /* 151 * caches 152 */ 153 struct kmem_cache *ceph_inode_cachep; 154 struct kmem_cache *ceph_cap_cachep; 155 struct kmem_cache *ceph_dentry_cachep; 156 struct kmem_cache *ceph_file_cachep; 157 158 static void ceph_inode_init_once(void *foo) 159 { 160 struct ceph_inode_info *ci = foo; 161 inode_init_once(&ci->vfs_inode); 162 } 163 164 static int default_congestion_kb(void) 165 { 166 int congestion_kb; 167 168 /* 169 * Copied from NFS 170 * 171 * congestion size, scale with available memory. 172 * 173 * 64MB: 8192k 174 * 128MB: 11585k 175 * 256MB: 16384k 176 * 512MB: 23170k 177 * 1GB: 32768k 178 * 2GB: 46340k 179 * 4GB: 65536k 180 * 8GB: 92681k 181 * 16GB: 131072k 182 * 183 * This allows larger machines to have larger/more transfers. 184 * Limit the default to 256M 185 */ 186 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 187 if (congestion_kb > 256*1024) 188 congestion_kb = 256*1024; 189 190 return congestion_kb; 191 } 192 193 static int __init init_caches(void) 194 { 195 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 196 sizeof(struct ceph_inode_info), 197 __alignof__(struct ceph_inode_info), 198 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 199 ceph_inode_init_once); 200 if (ceph_inode_cachep == NULL) 201 return -ENOMEM; 202 203 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 204 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 205 if (ceph_cap_cachep == NULL) 206 goto bad_cap; 207 208 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 209 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 210 if (ceph_dentry_cachep == NULL) 211 goto bad_dentry; 212 213 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 214 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 215 if (ceph_file_cachep == NULL) 216 goto bad_file; 217 218 return 0; 219 220 bad_file: 221 kmem_cache_destroy(ceph_dentry_cachep); 222 bad_dentry: 223 kmem_cache_destroy(ceph_cap_cachep); 224 bad_cap: 225 kmem_cache_destroy(ceph_inode_cachep); 226 return -ENOMEM; 227 } 228 229 static void destroy_caches(void) 230 { 231 kmem_cache_destroy(ceph_inode_cachep); 232 kmem_cache_destroy(ceph_cap_cachep); 233 kmem_cache_destroy(ceph_dentry_cachep); 234 kmem_cache_destroy(ceph_file_cachep); 235 } 236 237 238 /* 239 * ceph_umount_begin - initiate forced umount. Tear down down the 240 * mount, skipping steps that may hang while waiting for server(s). 241 */ 242 static void ceph_umount_begin(struct super_block *sb) 243 { 244 struct ceph_client *client = ceph_sb_to_client(sb); 245 246 dout("ceph_umount_begin - starting forced umount\n"); 247 if (!client) 248 return; 249 client->mount_state = CEPH_MOUNT_SHUTDOWN; 250 return; 251 } 252 253 static const struct super_operations ceph_super_ops = { 254 .alloc_inode = ceph_alloc_inode, 255 .destroy_inode = ceph_destroy_inode, 256 .write_inode = ceph_write_inode, 257 .sync_fs = ceph_syncfs, 258 .put_super = ceph_put_super, 259 .show_options = ceph_show_options, 260 .statfs = ceph_statfs, 261 .umount_begin = ceph_umount_begin, 262 }; 263 264 265 const char *ceph_msg_type_name(int type) 266 { 267 switch (type) { 268 case CEPH_MSG_SHUTDOWN: return "shutdown"; 269 case CEPH_MSG_PING: return "ping"; 270 case CEPH_MSG_AUTH: return "auth"; 271 case CEPH_MSG_AUTH_REPLY: return "auth_reply"; 272 case CEPH_MSG_MON_MAP: return "mon_map"; 273 case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; 274 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; 275 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; 276 case CEPH_MSG_STATFS: return "statfs"; 277 case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; 278 case CEPH_MSG_MDS_MAP: return "mds_map"; 279 case CEPH_MSG_CLIENT_SESSION: return "client_session"; 280 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; 281 case CEPH_MSG_CLIENT_REQUEST: return "client_request"; 282 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; 283 case CEPH_MSG_CLIENT_REPLY: return "client_reply"; 284 case CEPH_MSG_CLIENT_CAPS: return "client_caps"; 285 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; 286 case CEPH_MSG_CLIENT_SNAP: return "client_snap"; 287 case CEPH_MSG_CLIENT_LEASE: return "client_lease"; 288 case CEPH_MSG_OSD_MAP: return "osd_map"; 289 case CEPH_MSG_OSD_OP: return "osd_op"; 290 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; 291 default: return "unknown"; 292 } 293 } 294 295 296 /* 297 * mount options 298 */ 299 enum { 300 Opt_fsidmajor, 301 Opt_fsidminor, 302 Opt_monport, 303 Opt_wsize, 304 Opt_rsize, 305 Opt_osdtimeout, 306 Opt_osdkeepalivetimeout, 307 Opt_mount_timeout, 308 Opt_osd_idle_ttl, 309 Opt_caps_wanted_delay_min, 310 Opt_caps_wanted_delay_max, 311 Opt_readdir_max_entries, 312 Opt_congestion_kb, 313 Opt_last_int, 314 /* int args above */ 315 Opt_snapdirname, 316 Opt_name, 317 Opt_secret, 318 Opt_last_string, 319 /* string args above */ 320 Opt_ip, 321 Opt_noshare, 322 Opt_dirstat, 323 Opt_nodirstat, 324 Opt_rbytes, 325 Opt_norbytes, 326 Opt_nocrc, 327 Opt_noasyncreaddir, 328 }; 329 330 static match_table_t arg_tokens = { 331 {Opt_fsidmajor, "fsidmajor=%ld"}, 332 {Opt_fsidminor, "fsidminor=%ld"}, 333 {Opt_monport, "monport=%d"}, 334 {Opt_wsize, "wsize=%d"}, 335 {Opt_rsize, "rsize=%d"}, 336 {Opt_osdtimeout, "osdtimeout=%d"}, 337 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, 338 {Opt_mount_timeout, "mount_timeout=%d"}, 339 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"}, 340 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 341 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 342 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 343 {Opt_congestion_kb, "write_congestion_kb=%d"}, 344 /* int args above */ 345 {Opt_snapdirname, "snapdirname=%s"}, 346 {Opt_name, "name=%s"}, 347 {Opt_secret, "secret=%s"}, 348 /* string args above */ 349 {Opt_ip, "ip=%s"}, 350 {Opt_noshare, "noshare"}, 351 {Opt_dirstat, "dirstat"}, 352 {Opt_nodirstat, "nodirstat"}, 353 {Opt_rbytes, "rbytes"}, 354 {Opt_norbytes, "norbytes"}, 355 {Opt_nocrc, "nocrc"}, 356 {Opt_noasyncreaddir, "noasyncreaddir"}, 357 {-1, NULL} 358 }; 359 360 361 static struct ceph_mount_args *parse_mount_args(int flags, char *options, 362 const char *dev_name, 363 const char **path) 364 { 365 struct ceph_mount_args *args; 366 const char *c; 367 int err = -ENOMEM; 368 substring_t argstr[MAX_OPT_ARGS]; 369 370 args = kzalloc(sizeof(*args), GFP_KERNEL); 371 if (!args) 372 return ERR_PTR(-ENOMEM); 373 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr), 374 GFP_KERNEL); 375 if (!args->mon_addr) 376 goto out; 377 378 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name); 379 380 /* start with defaults */ 381 args->sb_flags = flags; 382 args->flags = CEPH_OPT_DEFAULT; 383 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT; 384 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; 385 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ 386 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ 387 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 388 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 389 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT; 390 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 391 args->cap_release_safety = CEPH_CAPS_PER_RELEASE * 4; 392 args->max_readdir = 1024; 393 args->congestion_kb = default_congestion_kb(); 394 395 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 396 err = -EINVAL; 397 if (!dev_name) 398 goto out; 399 *path = strstr(dev_name, ":/"); 400 if (*path == NULL) { 401 pr_err("device name is missing path (no :/ in %s)\n", 402 dev_name); 403 goto out; 404 } 405 406 /* get mon ip(s) */ 407 err = ceph_parse_ips(dev_name, *path, args->mon_addr, 408 CEPH_MAX_MON, &args->num_mon); 409 if (err < 0) 410 goto out; 411 412 /* path on server */ 413 *path += 2; 414 dout("server path '%s'\n", *path); 415 416 /* parse mount options */ 417 while ((c = strsep(&options, ",")) != NULL) { 418 int token, intval, ret; 419 if (!*c) 420 continue; 421 err = -EINVAL; 422 token = match_token((char *)c, arg_tokens, argstr); 423 if (token < 0) { 424 pr_err("bad mount option at '%s'\n", c); 425 goto out; 426 } 427 if (token < Opt_last_int) { 428 ret = match_int(&argstr[0], &intval); 429 if (ret < 0) { 430 pr_err("bad mount option arg (not int) " 431 "at '%s'\n", c); 432 continue; 433 } 434 dout("got int token %d val %d\n", token, intval); 435 } else if (token > Opt_last_int && token < Opt_last_string) { 436 dout("got string token %d val %s\n", token, 437 argstr[0].from); 438 } else { 439 dout("got token %d\n", token); 440 } 441 switch (token) { 442 case Opt_fsidmajor: 443 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval); 444 break; 445 case Opt_fsidminor: 446 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval); 447 break; 448 case Opt_ip: 449 err = ceph_parse_ips(argstr[0].from, 450 argstr[0].to, 451 &args->my_addr, 452 1, NULL); 453 if (err < 0) 454 goto out; 455 args->flags |= CEPH_OPT_MYIP; 456 break; 457 458 case Opt_snapdirname: 459 kfree(args->snapdir_name); 460 args->snapdir_name = kstrndup(argstr[0].from, 461 argstr[0].to-argstr[0].from, 462 GFP_KERNEL); 463 break; 464 case Opt_name: 465 args->name = kstrndup(argstr[0].from, 466 argstr[0].to-argstr[0].from, 467 GFP_KERNEL); 468 break; 469 case Opt_secret: 470 args->secret = kstrndup(argstr[0].from, 471 argstr[0].to-argstr[0].from, 472 GFP_KERNEL); 473 break; 474 475 /* misc */ 476 case Opt_wsize: 477 args->wsize = intval; 478 break; 479 case Opt_rsize: 480 args->rsize = intval; 481 break; 482 case Opt_osdtimeout: 483 args->osd_timeout = intval; 484 break; 485 case Opt_osdkeepalivetimeout: 486 args->osd_keepalive_timeout = intval; 487 break; 488 case Opt_mount_timeout: 489 args->mount_timeout = intval; 490 break; 491 case Opt_caps_wanted_delay_min: 492 args->caps_wanted_delay_min = intval; 493 break; 494 case Opt_caps_wanted_delay_max: 495 args->caps_wanted_delay_max = intval; 496 break; 497 case Opt_readdir_max_entries: 498 args->max_readdir = intval; 499 break; 500 case Opt_congestion_kb: 501 args->congestion_kb = intval; 502 break; 503 504 case Opt_noshare: 505 args->flags |= CEPH_OPT_NOSHARE; 506 break; 507 508 case Opt_dirstat: 509 args->flags |= CEPH_OPT_DIRSTAT; 510 break; 511 case Opt_nodirstat: 512 args->flags &= ~CEPH_OPT_DIRSTAT; 513 break; 514 case Opt_rbytes: 515 args->flags |= CEPH_OPT_RBYTES; 516 break; 517 case Opt_norbytes: 518 args->flags &= ~CEPH_OPT_RBYTES; 519 break; 520 case Opt_nocrc: 521 args->flags |= CEPH_OPT_NOCRC; 522 break; 523 case Opt_noasyncreaddir: 524 args->flags |= CEPH_OPT_NOASYNCREADDIR; 525 break; 526 527 default: 528 BUG_ON(token); 529 } 530 } 531 return args; 532 533 out: 534 kfree(args->mon_addr); 535 kfree(args); 536 return ERR_PTR(err); 537 } 538 539 static void destroy_mount_args(struct ceph_mount_args *args) 540 { 541 dout("destroy_mount_args %p\n", args); 542 kfree(args->snapdir_name); 543 args->snapdir_name = NULL; 544 kfree(args->name); 545 args->name = NULL; 546 kfree(args->secret); 547 args->secret = NULL; 548 kfree(args); 549 } 550 551 /* 552 * create a fresh client instance 553 */ 554 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) 555 { 556 struct ceph_client *client; 557 int err = -ENOMEM; 558 559 client = kzalloc(sizeof(*client), GFP_KERNEL); 560 if (client == NULL) 561 return ERR_PTR(-ENOMEM); 562 563 mutex_init(&client->mount_mutex); 564 565 init_waitqueue_head(&client->auth_wq); 566 567 client->sb = NULL; 568 client->mount_state = CEPH_MOUNT_MOUNTING; 569 client->mount_args = args; 570 571 client->msgr = NULL; 572 573 client->auth_err = 0; 574 atomic_long_set(&client->writeback_count, 0); 575 576 err = bdi_init(&client->backing_dev_info); 577 if (err < 0) 578 goto fail; 579 580 err = -ENOMEM; 581 client->wb_wq = create_workqueue("ceph-writeback"); 582 if (client->wb_wq == NULL) 583 goto fail_bdi; 584 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid"); 585 if (client->pg_inv_wq == NULL) 586 goto fail_wb_wq; 587 client->trunc_wq = create_singlethread_workqueue("ceph-trunc"); 588 if (client->trunc_wq == NULL) 589 goto fail_pg_inv_wq; 590 591 /* set up mempools */ 592 err = -ENOMEM; 593 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 594 client->mount_args->wsize >> PAGE_CACHE_SHIFT); 595 if (!client->wb_pagevec_pool) 596 goto fail_trunc_wq; 597 598 /* caps */ 599 client->min_caps = args->max_readdir; 600 ceph_adjust_min_caps(client->min_caps); 601 602 /* subsystems */ 603 err = ceph_monc_init(&client->monc, client); 604 if (err < 0) 605 goto fail_mempool; 606 err = ceph_osdc_init(&client->osdc, client); 607 if (err < 0) 608 goto fail_monc; 609 err = ceph_mdsc_init(&client->mdsc, client); 610 if (err < 0) 611 goto fail_osdc; 612 return client; 613 614 fail_osdc: 615 ceph_osdc_stop(&client->osdc); 616 fail_monc: 617 ceph_monc_stop(&client->monc); 618 fail_mempool: 619 mempool_destroy(client->wb_pagevec_pool); 620 fail_trunc_wq: 621 destroy_workqueue(client->trunc_wq); 622 fail_pg_inv_wq: 623 destroy_workqueue(client->pg_inv_wq); 624 fail_wb_wq: 625 destroy_workqueue(client->wb_wq); 626 fail_bdi: 627 bdi_destroy(&client->backing_dev_info); 628 fail: 629 kfree(client); 630 return ERR_PTR(err); 631 } 632 633 static void ceph_destroy_client(struct ceph_client *client) 634 { 635 dout("destroy_client %p\n", client); 636 637 /* unmount */ 638 ceph_mdsc_stop(&client->mdsc); 639 ceph_monc_stop(&client->monc); 640 ceph_osdc_stop(&client->osdc); 641 642 ceph_adjust_min_caps(-client->min_caps); 643 644 ceph_debugfs_client_cleanup(client); 645 destroy_workqueue(client->wb_wq); 646 destroy_workqueue(client->pg_inv_wq); 647 destroy_workqueue(client->trunc_wq); 648 649 bdi_destroy(&client->backing_dev_info); 650 651 if (client->msgr) 652 ceph_messenger_destroy(client->msgr); 653 mempool_destroy(client->wb_pagevec_pool); 654 655 destroy_mount_args(client->mount_args); 656 657 kfree(client); 658 dout("destroy_client %p done\n", client); 659 } 660 661 /* 662 * Initially learn our fsid, or verify an fsid matches. 663 */ 664 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) 665 { 666 if (client->have_fsid) { 667 if (ceph_fsid_compare(&client->fsid, fsid)) { 668 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT, 669 PR_FSID(&client->fsid), PR_FSID(fsid)); 670 return -1; 671 } 672 } else { 673 pr_info("client%lld fsid " FSID_FORMAT "\n", 674 client->monc.auth->global_id, PR_FSID(fsid)); 675 memcpy(&client->fsid, fsid, sizeof(*fsid)); 676 ceph_debugfs_client_init(client); 677 client->have_fsid = true; 678 } 679 return 0; 680 } 681 682 /* 683 * true if we have the mon map (and have thus joined the cluster) 684 */ 685 static int have_mon_map(struct ceph_client *client) 686 { 687 return client->monc.monmap && client->monc.monmap->epoch; 688 } 689 690 /* 691 * Bootstrap mount by opening the root directory. Note the mount 692 * @started time from caller, and time out if this takes too long. 693 */ 694 static struct dentry *open_root_dentry(struct ceph_client *client, 695 const char *path, 696 unsigned long started) 697 { 698 struct ceph_mds_client *mdsc = &client->mdsc; 699 struct ceph_mds_request *req = NULL; 700 int err; 701 struct dentry *root; 702 703 /* open dir */ 704 dout("open_root_inode opening '%s'\n", path); 705 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 706 if (IS_ERR(req)) 707 return ERR_PTR(PTR_ERR(req)); 708 req->r_path1 = kstrdup(path, GFP_NOFS); 709 req->r_ino1.ino = CEPH_INO_ROOT; 710 req->r_ino1.snap = CEPH_NOSNAP; 711 req->r_started = started; 712 req->r_timeout = client->mount_args->mount_timeout * HZ; 713 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 714 req->r_num_caps = 2; 715 err = ceph_mdsc_do_request(mdsc, NULL, req); 716 if (err == 0) { 717 dout("open_root_inode success\n"); 718 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && 719 client->sb->s_root == NULL) 720 root = d_alloc_root(req->r_target_inode); 721 else 722 root = d_obtain_alias(req->r_target_inode); 723 req->r_target_inode = NULL; 724 dout("open_root_inode success, root dentry is %p\n", root); 725 } else { 726 root = ERR_PTR(err); 727 } 728 ceph_mdsc_put_request(req); 729 return root; 730 } 731 732 /* 733 * mount: join the ceph cluster, and open root directory. 734 */ 735 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt, 736 const char *path) 737 { 738 struct ceph_entity_addr *myaddr = NULL; 739 int err; 740 unsigned long timeout = client->mount_args->mount_timeout * HZ; 741 unsigned long started = jiffies; /* note the start time */ 742 struct dentry *root; 743 744 dout("mount start\n"); 745 mutex_lock(&client->mount_mutex); 746 747 /* initialize the messenger */ 748 if (client->msgr == NULL) { 749 if (ceph_test_opt(client, MYIP)) 750 myaddr = &client->mount_args->my_addr; 751 client->msgr = ceph_messenger_create(myaddr); 752 if (IS_ERR(client->msgr)) { 753 err = PTR_ERR(client->msgr); 754 client->msgr = NULL; 755 goto out; 756 } 757 client->msgr->nocrc = ceph_test_opt(client, NOCRC); 758 } 759 760 /* open session, and wait for mon, mds, and osd maps */ 761 err = ceph_monc_open_session(&client->monc); 762 if (err < 0) 763 goto out; 764 765 while (!have_mon_map(client)) { 766 err = -EIO; 767 if (timeout && time_after_eq(jiffies, started + timeout)) 768 goto out; 769 770 /* wait */ 771 dout("mount waiting for mon_map\n"); 772 err = wait_event_interruptible_timeout(client->auth_wq, 773 have_mon_map(client) || (client->auth_err < 0), 774 timeout); 775 if (err == -EINTR || err == -ERESTARTSYS) 776 goto out; 777 if (client->auth_err < 0) { 778 err = client->auth_err; 779 goto out; 780 } 781 } 782 783 dout("mount opening root\n"); 784 root = open_root_dentry(client, "", started); 785 if (IS_ERR(root)) { 786 err = PTR_ERR(root); 787 goto out; 788 } 789 if (client->sb->s_root) 790 dput(root); 791 else 792 client->sb->s_root = root; 793 794 if (path[0] == 0) { 795 dget(root); 796 } else { 797 dout("mount opening base mountpoint\n"); 798 root = open_root_dentry(client, path, started); 799 if (IS_ERR(root)) { 800 err = PTR_ERR(root); 801 dput(client->sb->s_root); 802 client->sb->s_root = NULL; 803 goto out; 804 } 805 } 806 807 mnt->mnt_root = root; 808 mnt->mnt_sb = client->sb; 809 810 client->mount_state = CEPH_MOUNT_MOUNTED; 811 dout("mount success\n"); 812 err = 0; 813 814 out: 815 mutex_unlock(&client->mount_mutex); 816 return err; 817 } 818 819 static int ceph_set_super(struct super_block *s, void *data) 820 { 821 struct ceph_client *client = data; 822 int ret; 823 824 dout("set_super %p data %p\n", s, data); 825 826 s->s_flags = client->mount_args->sb_flags; 827 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 828 829 s->s_fs_info = client; 830 client->sb = s; 831 832 s->s_op = &ceph_super_ops; 833 s->s_export_op = &ceph_export_ops; 834 835 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 836 837 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 838 if (ret != 0) 839 goto fail; 840 841 return ret; 842 843 fail: 844 s->s_fs_info = NULL; 845 client->sb = NULL; 846 return ret; 847 } 848 849 /* 850 * share superblock if same fs AND options 851 */ 852 static int ceph_compare_super(struct super_block *sb, void *data) 853 { 854 struct ceph_client *new = data; 855 struct ceph_mount_args *args = new->mount_args; 856 struct ceph_client *other = ceph_sb_to_client(sb); 857 int i; 858 859 dout("ceph_compare_super %p\n", sb); 860 if (args->flags & CEPH_OPT_FSID) { 861 if (ceph_fsid_compare(&args->fsid, &other->fsid)) { 862 dout("fsid doesn't match\n"); 863 return 0; 864 } 865 } else { 866 /* do we share (a) monitor? */ 867 for (i = 0; i < new->monc.monmap->num_mon; i++) 868 if (ceph_monmap_contains(other->monc.monmap, 869 &new->monc.monmap->mon_inst[i].addr)) 870 break; 871 if (i == new->monc.monmap->num_mon) { 872 dout("mon ip not part of monmap\n"); 873 return 0; 874 } 875 dout("mon ip matches existing sb %p\n", sb); 876 } 877 if (args->sb_flags != other->mount_args->sb_flags) { 878 dout("flags differ\n"); 879 return 0; 880 } 881 return 1; 882 } 883 884 /* 885 * construct our own bdi so we can control readahead, etc. 886 */ 887 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client) 888 { 889 int err; 890 891 /* set ra_pages based on rsize mount option? */ 892 if (client->mount_args->rsize >= PAGE_CACHE_SIZE) 893 client->backing_dev_info.ra_pages = 894 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1) 895 >> PAGE_SHIFT; 896 err = bdi_register_dev(&client->backing_dev_info, sb->s_dev); 897 if (!err) 898 sb->s_bdi = &client->backing_dev_info; 899 return err; 900 } 901 902 static int ceph_get_sb(struct file_system_type *fs_type, 903 int flags, const char *dev_name, void *data, 904 struct vfsmount *mnt) 905 { 906 struct super_block *sb; 907 struct ceph_client *client; 908 int err; 909 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 910 const char *path = NULL; 911 struct ceph_mount_args *args; 912 913 dout("ceph_get_sb\n"); 914 args = parse_mount_args(flags, data, dev_name, &path); 915 if (IS_ERR(args)) { 916 err = PTR_ERR(args); 917 goto out_final; 918 } 919 920 /* create client (which we may/may not use) */ 921 client = ceph_create_client(args); 922 if (IS_ERR(client)) { 923 err = PTR_ERR(client); 924 goto out_final; 925 } 926 927 if (client->mount_args->flags & CEPH_OPT_NOSHARE) 928 compare_super = NULL; 929 sb = sget(fs_type, compare_super, ceph_set_super, client); 930 if (IS_ERR(sb)) { 931 err = PTR_ERR(sb); 932 goto out; 933 } 934 935 if (ceph_client(sb) != client) { 936 ceph_destroy_client(client); 937 client = ceph_client(sb); 938 dout("get_sb got existing client %p\n", client); 939 } else { 940 dout("get_sb using new client %p\n", client); 941 err = ceph_register_bdi(sb, client); 942 if (err < 0) 943 goto out_splat; 944 } 945 946 err = ceph_mount(client, mnt, path); 947 if (err < 0) 948 goto out_splat; 949 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root, 950 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode)); 951 return 0; 952 953 out_splat: 954 ceph_mdsc_close_sessions(&client->mdsc); 955 up_write(&sb->s_umount); 956 deactivate_super(sb); 957 goto out_final; 958 959 out: 960 ceph_destroy_client(client); 961 out_final: 962 dout("ceph_get_sb fail %d\n", err); 963 return err; 964 } 965 966 static void ceph_kill_sb(struct super_block *s) 967 { 968 struct ceph_client *client = ceph_sb_to_client(s); 969 dout("kill_sb %p\n", s); 970 ceph_mdsc_pre_umount(&client->mdsc); 971 kill_anon_super(s); /* will call put_super after sb is r/o */ 972 ceph_destroy_client(client); 973 } 974 975 static struct file_system_type ceph_fs_type = { 976 .owner = THIS_MODULE, 977 .name = "ceph", 978 .get_sb = ceph_get_sb, 979 .kill_sb = ceph_kill_sb, 980 .fs_flags = FS_RENAME_DOES_D_MOVE, 981 }; 982 983 #define _STRINGIFY(x) #x 984 #define STRINGIFY(x) _STRINGIFY(x) 985 986 static int __init init_ceph(void) 987 { 988 int ret = 0; 989 990 ret = ceph_debugfs_init(); 991 if (ret < 0) 992 goto out; 993 994 ret = ceph_msgr_init(); 995 if (ret < 0) 996 goto out_debugfs; 997 998 ret = init_caches(); 999 if (ret) 1000 goto out_msgr; 1001 1002 ceph_caps_init(); 1003 1004 ret = register_filesystem(&ceph_fs_type); 1005 if (ret) 1006 goto out_icache; 1007 1008 pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n", 1009 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL, 1010 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT, 1011 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT); 1012 return 0; 1013 1014 out_icache: 1015 destroy_caches(); 1016 out_msgr: 1017 ceph_msgr_exit(); 1018 out_debugfs: 1019 ceph_debugfs_cleanup(); 1020 out: 1021 return ret; 1022 } 1023 1024 static void __exit exit_ceph(void) 1025 { 1026 dout("exit_ceph\n"); 1027 unregister_filesystem(&ceph_fs_type); 1028 ceph_caps_finalize(); 1029 destroy_caches(); 1030 ceph_msgr_exit(); 1031 ceph_debugfs_cleanup(); 1032 } 1033 1034 module_init(init_ceph); 1035 module_exit(exit_ceph); 1036 1037 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1038 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1039 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1040 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1041 MODULE_LICENSE("GPL"); 1042