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/sched.h> 12 #include <linux/seq_file.h> 13 #include <linux/slab.h> 14 #include <linux/statfs.h> 15 #include <linux/string.h> 16 17 #include "decode.h" 18 #include "super.h" 19 #include "mon_client.h" 20 #include "auth.h" 21 22 /* 23 * Ceph superblock operations 24 * 25 * Handle the basics of mounting, unmounting. 26 */ 27 28 29 /* 30 * find filename portion of a path (/foo/bar/baz -> baz) 31 */ 32 const char *ceph_file_part(const char *s, int len) 33 { 34 const char *e = s + len; 35 36 while (e != s && *(e-1) != '/') 37 e--; 38 return e; 39 } 40 41 42 /* 43 * super ops 44 */ 45 static void ceph_put_super(struct super_block *s) 46 { 47 struct ceph_client *client = ceph_sb_to_client(s); 48 49 dout("put_super\n"); 50 ceph_mdsc_close_sessions(&client->mdsc); 51 52 /* 53 * ensure we release the bdi before put_anon_super releases 54 * the device name. 55 */ 56 if (s->s_bdi == &client->backing_dev_info) { 57 bdi_unregister(&client->backing_dev_info); 58 s->s_bdi = NULL; 59 } 60 61 return; 62 } 63 64 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 65 { 66 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode); 67 struct ceph_monmap *monmap = client->monc.monmap; 68 struct ceph_statfs st; 69 u64 fsid; 70 int err; 71 72 dout("statfs\n"); 73 err = ceph_monc_do_statfs(&client->monc, &st); 74 if (err < 0) 75 return err; 76 77 /* fill in kstatfs */ 78 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 79 80 /* 81 * express utilization in terms of large blocks to avoid 82 * overflow on 32-bit machines. 83 */ 84 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 85 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 86 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >> 87 (CEPH_BLOCK_SHIFT-10); 88 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 89 90 buf->f_files = le64_to_cpu(st.num_objects); 91 buf->f_ffree = -1; 92 buf->f_namelen = PATH_MAX; 93 buf->f_frsize = PAGE_CACHE_SIZE; 94 95 /* leave fsid little-endian, regardless of host endianness */ 96 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 97 buf->f_fsid.val[0] = fsid & 0xffffffff; 98 buf->f_fsid.val[1] = fsid >> 32; 99 100 return 0; 101 } 102 103 104 static int ceph_syncfs(struct super_block *sb, int wait) 105 { 106 dout("sync_fs %d\n", wait); 107 ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc); 108 ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc); 109 dout("sync_fs %d done\n", wait); 110 return 0; 111 } 112 113 static int default_congestion_kb(void) 114 { 115 int congestion_kb; 116 117 /* 118 * Copied from NFS 119 * 120 * congestion size, scale with available memory. 121 * 122 * 64MB: 8192k 123 * 128MB: 11585k 124 * 256MB: 16384k 125 * 512MB: 23170k 126 * 1GB: 32768k 127 * 2GB: 46340k 128 * 4GB: 65536k 129 * 8GB: 92681k 130 * 16GB: 131072k 131 * 132 * This allows larger machines to have larger/more transfers. 133 * Limit the default to 256M 134 */ 135 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 136 if (congestion_kb > 256*1024) 137 congestion_kb = 256*1024; 138 139 return congestion_kb; 140 } 141 142 /** 143 * ceph_show_options - Show mount options in /proc/mounts 144 * @m: seq_file to write to 145 * @mnt: mount descriptor 146 */ 147 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) 148 { 149 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb); 150 struct ceph_mount_args *args = client->mount_args; 151 152 if (args->flags & CEPH_OPT_FSID) 153 seq_printf(m, ",fsidmajor=%llu,fsidminor%llu", 154 le64_to_cpu(*(__le64 *)&args->fsid.fsid[0]), 155 le64_to_cpu(*(__le64 *)&args->fsid.fsid[8])); 156 if (args->flags & CEPH_OPT_NOSHARE) 157 seq_puts(m, ",noshare"); 158 if (args->flags & CEPH_OPT_DIRSTAT) 159 seq_puts(m, ",dirstat"); 160 if ((args->flags & CEPH_OPT_RBYTES) == 0) 161 seq_puts(m, ",norbytes"); 162 if (args->flags & CEPH_OPT_NOCRC) 163 seq_puts(m, ",nocrc"); 164 if (args->flags & CEPH_OPT_NOASYNCREADDIR) 165 seq_puts(m, ",noasyncreaddir"); 166 167 if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 168 seq_printf(m, ",mount_timeout=%d", args->mount_timeout); 169 if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 170 seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl); 171 if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) 172 seq_printf(m, ",osdtimeout=%d", args->osd_timeout); 173 if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 174 seq_printf(m, ",osdkeepalivetimeout=%d", 175 args->osd_keepalive_timeout); 176 if (args->wsize) 177 seq_printf(m, ",wsize=%d", args->wsize); 178 if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT) 179 seq_printf(m, ",rsize=%d", args->rsize); 180 if (args->congestion_kb != default_congestion_kb()) 181 seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb); 182 if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 183 seq_printf(m, ",caps_wanted_delay_min=%d", 184 args->caps_wanted_delay_min); 185 if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 186 seq_printf(m, ",caps_wanted_delay_max=%d", 187 args->caps_wanted_delay_max); 188 if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 189 seq_printf(m, ",cap_release_safety=%d", 190 args->cap_release_safety); 191 if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT) 192 seq_printf(m, ",readdir_max_entries=%d", args->max_readdir); 193 if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 194 seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes); 195 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 196 seq_printf(m, ",snapdirname=%s", args->snapdir_name); 197 if (args->name) 198 seq_printf(m, ",name=%s", args->name); 199 if (args->secret) 200 seq_puts(m, ",secret=<hidden>"); 201 return 0; 202 } 203 204 /* 205 * caches 206 */ 207 struct kmem_cache *ceph_inode_cachep; 208 struct kmem_cache *ceph_cap_cachep; 209 struct kmem_cache *ceph_dentry_cachep; 210 struct kmem_cache *ceph_file_cachep; 211 212 static void ceph_inode_init_once(void *foo) 213 { 214 struct ceph_inode_info *ci = foo; 215 inode_init_once(&ci->vfs_inode); 216 } 217 218 static int __init init_caches(void) 219 { 220 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 221 sizeof(struct ceph_inode_info), 222 __alignof__(struct ceph_inode_info), 223 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 224 ceph_inode_init_once); 225 if (ceph_inode_cachep == NULL) 226 return -ENOMEM; 227 228 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 229 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 230 if (ceph_cap_cachep == NULL) 231 goto bad_cap; 232 233 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 234 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 235 if (ceph_dentry_cachep == NULL) 236 goto bad_dentry; 237 238 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 239 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 240 if (ceph_file_cachep == NULL) 241 goto bad_file; 242 243 return 0; 244 245 bad_file: 246 kmem_cache_destroy(ceph_dentry_cachep); 247 bad_dentry: 248 kmem_cache_destroy(ceph_cap_cachep); 249 bad_cap: 250 kmem_cache_destroy(ceph_inode_cachep); 251 return -ENOMEM; 252 } 253 254 static void destroy_caches(void) 255 { 256 kmem_cache_destroy(ceph_inode_cachep); 257 kmem_cache_destroy(ceph_cap_cachep); 258 kmem_cache_destroy(ceph_dentry_cachep); 259 kmem_cache_destroy(ceph_file_cachep); 260 } 261 262 263 /* 264 * ceph_umount_begin - initiate forced umount. Tear down down the 265 * mount, skipping steps that may hang while waiting for server(s). 266 */ 267 static void ceph_umount_begin(struct super_block *sb) 268 { 269 struct ceph_client *client = ceph_sb_to_client(sb); 270 271 dout("ceph_umount_begin - starting forced umount\n"); 272 if (!client) 273 return; 274 client->mount_state = CEPH_MOUNT_SHUTDOWN; 275 return; 276 } 277 278 static const struct super_operations ceph_super_ops = { 279 .alloc_inode = ceph_alloc_inode, 280 .destroy_inode = ceph_destroy_inode, 281 .write_inode = ceph_write_inode, 282 .sync_fs = ceph_syncfs, 283 .put_super = ceph_put_super, 284 .show_options = ceph_show_options, 285 .statfs = ceph_statfs, 286 .umount_begin = ceph_umount_begin, 287 }; 288 289 290 const char *ceph_msg_type_name(int type) 291 { 292 switch (type) { 293 case CEPH_MSG_SHUTDOWN: return "shutdown"; 294 case CEPH_MSG_PING: return "ping"; 295 case CEPH_MSG_AUTH: return "auth"; 296 case CEPH_MSG_AUTH_REPLY: return "auth_reply"; 297 case CEPH_MSG_MON_MAP: return "mon_map"; 298 case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; 299 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; 300 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; 301 case CEPH_MSG_STATFS: return "statfs"; 302 case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; 303 case CEPH_MSG_MDS_MAP: return "mds_map"; 304 case CEPH_MSG_CLIENT_SESSION: return "client_session"; 305 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; 306 case CEPH_MSG_CLIENT_REQUEST: return "client_request"; 307 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; 308 case CEPH_MSG_CLIENT_REPLY: return "client_reply"; 309 case CEPH_MSG_CLIENT_CAPS: return "client_caps"; 310 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; 311 case CEPH_MSG_CLIENT_SNAP: return "client_snap"; 312 case CEPH_MSG_CLIENT_LEASE: return "client_lease"; 313 case CEPH_MSG_OSD_MAP: return "osd_map"; 314 case CEPH_MSG_OSD_OP: return "osd_op"; 315 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; 316 default: return "unknown"; 317 } 318 } 319 320 321 /* 322 * mount options 323 */ 324 enum { 325 Opt_fsidmajor, 326 Opt_fsidminor, 327 Opt_monport, 328 Opt_wsize, 329 Opt_rsize, 330 Opt_osdtimeout, 331 Opt_osdkeepalivetimeout, 332 Opt_mount_timeout, 333 Opt_osd_idle_ttl, 334 Opt_caps_wanted_delay_min, 335 Opt_caps_wanted_delay_max, 336 Opt_cap_release_safety, 337 Opt_readdir_max_entries, 338 Opt_readdir_max_bytes, 339 Opt_congestion_kb, 340 Opt_last_int, 341 /* int args above */ 342 Opt_snapdirname, 343 Opt_name, 344 Opt_secret, 345 Opt_last_string, 346 /* string args above */ 347 Opt_ip, 348 Opt_noshare, 349 Opt_dirstat, 350 Opt_nodirstat, 351 Opt_rbytes, 352 Opt_norbytes, 353 Opt_nocrc, 354 Opt_noasyncreaddir, 355 }; 356 357 static match_table_t arg_tokens = { 358 {Opt_fsidmajor, "fsidmajor=%ld"}, 359 {Opt_fsidminor, "fsidminor=%ld"}, 360 {Opt_monport, "monport=%d"}, 361 {Opt_wsize, "wsize=%d"}, 362 {Opt_rsize, "rsize=%d"}, 363 {Opt_osdtimeout, "osdtimeout=%d"}, 364 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, 365 {Opt_mount_timeout, "mount_timeout=%d"}, 366 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"}, 367 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 368 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 369 {Opt_cap_release_safety, "cap_release_safety=%d"}, 370 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 371 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 372 {Opt_congestion_kb, "write_congestion_kb=%d"}, 373 /* int args above */ 374 {Opt_snapdirname, "snapdirname=%s"}, 375 {Opt_name, "name=%s"}, 376 {Opt_secret, "secret=%s"}, 377 /* string args above */ 378 {Opt_ip, "ip=%s"}, 379 {Opt_noshare, "noshare"}, 380 {Opt_dirstat, "dirstat"}, 381 {Opt_nodirstat, "nodirstat"}, 382 {Opt_rbytes, "rbytes"}, 383 {Opt_norbytes, "norbytes"}, 384 {Opt_nocrc, "nocrc"}, 385 {Opt_noasyncreaddir, "noasyncreaddir"}, 386 {-1, NULL} 387 }; 388 389 390 static struct ceph_mount_args *parse_mount_args(int flags, char *options, 391 const char *dev_name, 392 const char **path) 393 { 394 struct ceph_mount_args *args; 395 const char *c; 396 int err = -ENOMEM; 397 substring_t argstr[MAX_OPT_ARGS]; 398 399 args = kzalloc(sizeof(*args), GFP_KERNEL); 400 if (!args) 401 return ERR_PTR(-ENOMEM); 402 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr), 403 GFP_KERNEL); 404 if (!args->mon_addr) 405 goto out; 406 407 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name); 408 409 /* start with defaults */ 410 args->sb_flags = flags; 411 args->flags = CEPH_OPT_DEFAULT; 412 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT; 413 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; 414 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ 415 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ 416 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 417 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 418 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT; 419 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 420 args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 421 args->max_readdir = CEPH_MAX_READDIR_DEFAULT; 422 args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 423 args->congestion_kb = default_congestion_kb(); 424 425 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 426 err = -EINVAL; 427 if (!dev_name) 428 goto out; 429 *path = strstr(dev_name, ":/"); 430 if (*path == NULL) { 431 pr_err("device name is missing path (no :/ in %s)\n", 432 dev_name); 433 goto out; 434 } 435 436 /* get mon ip(s) */ 437 err = ceph_parse_ips(dev_name, *path, args->mon_addr, 438 CEPH_MAX_MON, &args->num_mon); 439 if (err < 0) 440 goto out; 441 442 /* path on server */ 443 *path += 2; 444 dout("server path '%s'\n", *path); 445 446 /* parse mount options */ 447 while ((c = strsep(&options, ",")) != NULL) { 448 int token, intval, ret; 449 if (!*c) 450 continue; 451 err = -EINVAL; 452 token = match_token((char *)c, arg_tokens, argstr); 453 if (token < 0) { 454 pr_err("bad mount option at '%s'\n", c); 455 goto out; 456 } 457 if (token < Opt_last_int) { 458 ret = match_int(&argstr[0], &intval); 459 if (ret < 0) { 460 pr_err("bad mount option arg (not int) " 461 "at '%s'\n", c); 462 continue; 463 } 464 dout("got int token %d val %d\n", token, intval); 465 } else if (token > Opt_last_int && token < Opt_last_string) { 466 dout("got string token %d val %s\n", token, 467 argstr[0].from); 468 } else { 469 dout("got token %d\n", token); 470 } 471 switch (token) { 472 case Opt_fsidmajor: 473 *(__le64 *)&args->fsid.fsid[0] = cpu_to_le64(intval); 474 break; 475 case Opt_fsidminor: 476 *(__le64 *)&args->fsid.fsid[8] = cpu_to_le64(intval); 477 break; 478 case Opt_ip: 479 err = ceph_parse_ips(argstr[0].from, 480 argstr[0].to, 481 &args->my_addr, 482 1, NULL); 483 if (err < 0) 484 goto out; 485 args->flags |= CEPH_OPT_MYIP; 486 break; 487 488 case Opt_snapdirname: 489 kfree(args->snapdir_name); 490 args->snapdir_name = kstrndup(argstr[0].from, 491 argstr[0].to-argstr[0].from, 492 GFP_KERNEL); 493 break; 494 case Opt_name: 495 args->name = kstrndup(argstr[0].from, 496 argstr[0].to-argstr[0].from, 497 GFP_KERNEL); 498 break; 499 case Opt_secret: 500 args->secret = kstrndup(argstr[0].from, 501 argstr[0].to-argstr[0].from, 502 GFP_KERNEL); 503 break; 504 505 /* misc */ 506 case Opt_wsize: 507 args->wsize = intval; 508 break; 509 case Opt_rsize: 510 args->rsize = intval; 511 break; 512 case Opt_osdtimeout: 513 args->osd_timeout = intval; 514 break; 515 case Opt_osdkeepalivetimeout: 516 args->osd_keepalive_timeout = intval; 517 break; 518 case Opt_mount_timeout: 519 args->mount_timeout = intval; 520 break; 521 case Opt_caps_wanted_delay_min: 522 args->caps_wanted_delay_min = intval; 523 break; 524 case Opt_caps_wanted_delay_max: 525 args->caps_wanted_delay_max = intval; 526 break; 527 case Opt_readdir_max_entries: 528 args->max_readdir = intval; 529 break; 530 case Opt_readdir_max_bytes: 531 args->max_readdir_bytes = intval; 532 break; 533 case Opt_congestion_kb: 534 args->congestion_kb = intval; 535 break; 536 537 case Opt_noshare: 538 args->flags |= CEPH_OPT_NOSHARE; 539 break; 540 541 case Opt_dirstat: 542 args->flags |= CEPH_OPT_DIRSTAT; 543 break; 544 case Opt_nodirstat: 545 args->flags &= ~CEPH_OPT_DIRSTAT; 546 break; 547 case Opt_rbytes: 548 args->flags |= CEPH_OPT_RBYTES; 549 break; 550 case Opt_norbytes: 551 args->flags &= ~CEPH_OPT_RBYTES; 552 break; 553 case Opt_nocrc: 554 args->flags |= CEPH_OPT_NOCRC; 555 break; 556 case Opt_noasyncreaddir: 557 args->flags |= CEPH_OPT_NOASYNCREADDIR; 558 break; 559 560 default: 561 BUG_ON(token); 562 } 563 } 564 return args; 565 566 out: 567 kfree(args->mon_addr); 568 kfree(args); 569 return ERR_PTR(err); 570 } 571 572 static void destroy_mount_args(struct ceph_mount_args *args) 573 { 574 dout("destroy_mount_args %p\n", args); 575 kfree(args->snapdir_name); 576 args->snapdir_name = NULL; 577 kfree(args->name); 578 args->name = NULL; 579 kfree(args->secret); 580 args->secret = NULL; 581 kfree(args); 582 } 583 584 /* 585 * create a fresh client instance 586 */ 587 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) 588 { 589 struct ceph_client *client; 590 int err = -ENOMEM; 591 592 client = kzalloc(sizeof(*client), GFP_KERNEL); 593 if (client == NULL) 594 return ERR_PTR(-ENOMEM); 595 596 mutex_init(&client->mount_mutex); 597 598 init_waitqueue_head(&client->auth_wq); 599 600 client->sb = NULL; 601 client->mount_state = CEPH_MOUNT_MOUNTING; 602 client->mount_args = args; 603 604 client->msgr = NULL; 605 606 client->auth_err = 0; 607 atomic_long_set(&client->writeback_count, 0); 608 609 err = bdi_init(&client->backing_dev_info); 610 if (err < 0) 611 goto fail; 612 613 err = -ENOMEM; 614 client->wb_wq = create_workqueue("ceph-writeback"); 615 if (client->wb_wq == NULL) 616 goto fail_bdi; 617 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid"); 618 if (client->pg_inv_wq == NULL) 619 goto fail_wb_wq; 620 client->trunc_wq = create_singlethread_workqueue("ceph-trunc"); 621 if (client->trunc_wq == NULL) 622 goto fail_pg_inv_wq; 623 624 /* set up mempools */ 625 err = -ENOMEM; 626 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 627 client->mount_args->wsize >> PAGE_CACHE_SHIFT); 628 if (!client->wb_pagevec_pool) 629 goto fail_trunc_wq; 630 631 /* caps */ 632 client->min_caps = args->max_readdir; 633 ceph_adjust_min_caps(client->min_caps); 634 635 /* subsystems */ 636 err = ceph_monc_init(&client->monc, client); 637 if (err < 0) 638 goto fail_mempool; 639 err = ceph_osdc_init(&client->osdc, client); 640 if (err < 0) 641 goto fail_monc; 642 err = ceph_mdsc_init(&client->mdsc, client); 643 if (err < 0) 644 goto fail_osdc; 645 return client; 646 647 fail_osdc: 648 ceph_osdc_stop(&client->osdc); 649 fail_monc: 650 ceph_monc_stop(&client->monc); 651 fail_mempool: 652 mempool_destroy(client->wb_pagevec_pool); 653 fail_trunc_wq: 654 destroy_workqueue(client->trunc_wq); 655 fail_pg_inv_wq: 656 destroy_workqueue(client->pg_inv_wq); 657 fail_wb_wq: 658 destroy_workqueue(client->wb_wq); 659 fail_bdi: 660 bdi_destroy(&client->backing_dev_info); 661 fail: 662 kfree(client); 663 return ERR_PTR(err); 664 } 665 666 static void ceph_destroy_client(struct ceph_client *client) 667 { 668 dout("destroy_client %p\n", client); 669 670 /* unmount */ 671 ceph_mdsc_stop(&client->mdsc); 672 ceph_monc_stop(&client->monc); 673 ceph_osdc_stop(&client->osdc); 674 675 ceph_adjust_min_caps(-client->min_caps); 676 677 ceph_debugfs_client_cleanup(client); 678 destroy_workqueue(client->wb_wq); 679 destroy_workqueue(client->pg_inv_wq); 680 destroy_workqueue(client->trunc_wq); 681 682 bdi_destroy(&client->backing_dev_info); 683 684 if (client->msgr) 685 ceph_messenger_destroy(client->msgr); 686 mempool_destroy(client->wb_pagevec_pool); 687 688 destroy_mount_args(client->mount_args); 689 690 kfree(client); 691 dout("destroy_client %p done\n", client); 692 } 693 694 /* 695 * Initially learn our fsid, or verify an fsid matches. 696 */ 697 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) 698 { 699 if (client->have_fsid) { 700 if (ceph_fsid_compare(&client->fsid, fsid)) { 701 pr_err("bad fsid, had " FSID_FORMAT " got " FSID_FORMAT, 702 PR_FSID(&client->fsid), PR_FSID(fsid)); 703 return -1; 704 } 705 } else { 706 pr_info("client%lld fsid " FSID_FORMAT "\n", 707 client->monc.auth->global_id, PR_FSID(fsid)); 708 memcpy(&client->fsid, fsid, sizeof(*fsid)); 709 ceph_debugfs_client_init(client); 710 client->have_fsid = true; 711 } 712 return 0; 713 } 714 715 /* 716 * true if we have the mon map (and have thus joined the cluster) 717 */ 718 static int have_mon_and_osd_map(struct ceph_client *client) 719 { 720 return client->monc.monmap && client->monc.monmap->epoch && 721 client->osdc.osdmap && client->osdc.osdmap->epoch; 722 } 723 724 /* 725 * Bootstrap mount by opening the root directory. Note the mount 726 * @started time from caller, and time out if this takes too long. 727 */ 728 static struct dentry *open_root_dentry(struct ceph_client *client, 729 const char *path, 730 unsigned long started) 731 { 732 struct ceph_mds_client *mdsc = &client->mdsc; 733 struct ceph_mds_request *req = NULL; 734 int err; 735 struct dentry *root; 736 737 /* open dir */ 738 dout("open_root_inode opening '%s'\n", path); 739 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 740 if (IS_ERR(req)) 741 return ERR_PTR(PTR_ERR(req)); 742 req->r_path1 = kstrdup(path, GFP_NOFS); 743 req->r_ino1.ino = CEPH_INO_ROOT; 744 req->r_ino1.snap = CEPH_NOSNAP; 745 req->r_started = started; 746 req->r_timeout = client->mount_args->mount_timeout * HZ; 747 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 748 req->r_num_caps = 2; 749 err = ceph_mdsc_do_request(mdsc, NULL, req); 750 if (err == 0) { 751 dout("open_root_inode success\n"); 752 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && 753 client->sb->s_root == NULL) 754 root = d_alloc_root(req->r_target_inode); 755 else 756 root = d_obtain_alias(req->r_target_inode); 757 req->r_target_inode = NULL; 758 dout("open_root_inode success, root dentry is %p\n", root); 759 } else { 760 root = ERR_PTR(err); 761 } 762 ceph_mdsc_put_request(req); 763 return root; 764 } 765 766 /* 767 * mount: join the ceph cluster, and open root directory. 768 */ 769 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt, 770 const char *path) 771 { 772 struct ceph_entity_addr *myaddr = NULL; 773 int err; 774 unsigned long timeout = client->mount_args->mount_timeout * HZ; 775 unsigned long started = jiffies; /* note the start time */ 776 struct dentry *root; 777 778 dout("mount start\n"); 779 mutex_lock(&client->mount_mutex); 780 781 /* initialize the messenger */ 782 if (client->msgr == NULL) { 783 if (ceph_test_opt(client, MYIP)) 784 myaddr = &client->mount_args->my_addr; 785 client->msgr = ceph_messenger_create(myaddr); 786 if (IS_ERR(client->msgr)) { 787 err = PTR_ERR(client->msgr); 788 client->msgr = NULL; 789 goto out; 790 } 791 client->msgr->nocrc = ceph_test_opt(client, NOCRC); 792 } 793 794 /* open session, and wait for mon, mds, and osd maps */ 795 err = ceph_monc_open_session(&client->monc); 796 if (err < 0) 797 goto out; 798 799 while (!have_mon_and_osd_map(client)) { 800 err = -EIO; 801 if (timeout && time_after_eq(jiffies, started + timeout)) 802 goto out; 803 804 /* wait */ 805 dout("mount waiting for mon_map\n"); 806 err = wait_event_interruptible_timeout(client->auth_wq, 807 have_mon_and_osd_map(client) || (client->auth_err < 0), 808 timeout); 809 if (err == -EINTR || err == -ERESTARTSYS) 810 goto out; 811 if (client->auth_err < 0) { 812 err = client->auth_err; 813 goto out; 814 } 815 } 816 817 dout("mount opening root\n"); 818 root = open_root_dentry(client, "", started); 819 if (IS_ERR(root)) { 820 err = PTR_ERR(root); 821 goto out; 822 } 823 if (client->sb->s_root) 824 dput(root); 825 else 826 client->sb->s_root = root; 827 828 if (path[0] == 0) { 829 dget(root); 830 } else { 831 dout("mount opening base mountpoint\n"); 832 root = open_root_dentry(client, path, started); 833 if (IS_ERR(root)) { 834 err = PTR_ERR(root); 835 dput(client->sb->s_root); 836 client->sb->s_root = NULL; 837 goto out; 838 } 839 } 840 841 mnt->mnt_root = root; 842 mnt->mnt_sb = client->sb; 843 844 client->mount_state = CEPH_MOUNT_MOUNTED; 845 dout("mount success\n"); 846 err = 0; 847 848 out: 849 mutex_unlock(&client->mount_mutex); 850 return err; 851 } 852 853 static int ceph_set_super(struct super_block *s, void *data) 854 { 855 struct ceph_client *client = data; 856 int ret; 857 858 dout("set_super %p data %p\n", s, data); 859 860 s->s_flags = client->mount_args->sb_flags; 861 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 862 863 s->s_fs_info = client; 864 client->sb = s; 865 866 s->s_op = &ceph_super_ops; 867 s->s_export_op = &ceph_export_ops; 868 869 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 870 871 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 872 if (ret != 0) 873 goto fail; 874 875 return ret; 876 877 fail: 878 s->s_fs_info = NULL; 879 client->sb = NULL; 880 return ret; 881 } 882 883 /* 884 * share superblock if same fs AND options 885 */ 886 static int ceph_compare_super(struct super_block *sb, void *data) 887 { 888 struct ceph_client *new = data; 889 struct ceph_mount_args *args = new->mount_args; 890 struct ceph_client *other = ceph_sb_to_client(sb); 891 int i; 892 893 dout("ceph_compare_super %p\n", sb); 894 if (args->flags & CEPH_OPT_FSID) { 895 if (ceph_fsid_compare(&args->fsid, &other->fsid)) { 896 dout("fsid doesn't match\n"); 897 return 0; 898 } 899 } else { 900 /* do we share (a) monitor? */ 901 for (i = 0; i < new->monc.monmap->num_mon; i++) 902 if (ceph_monmap_contains(other->monc.monmap, 903 &new->monc.monmap->mon_inst[i].addr)) 904 break; 905 if (i == new->monc.monmap->num_mon) { 906 dout("mon ip not part of monmap\n"); 907 return 0; 908 } 909 dout("mon ip matches existing sb %p\n", sb); 910 } 911 if (args->sb_flags != other->mount_args->sb_flags) { 912 dout("flags differ\n"); 913 return 0; 914 } 915 return 1; 916 } 917 918 /* 919 * construct our own bdi so we can control readahead, etc. 920 */ 921 static atomic_long_t bdi_seq = ATOMIC_INIT(0); 922 923 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client) 924 { 925 int err; 926 927 /* set ra_pages based on rsize mount option? */ 928 if (client->mount_args->rsize >= PAGE_CACHE_SIZE) 929 client->backing_dev_info.ra_pages = 930 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1) 931 >> PAGE_SHIFT; 932 err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d", 933 atomic_long_inc_return(&bdi_seq)); 934 if (!err) 935 sb->s_bdi = &client->backing_dev_info; 936 return err; 937 } 938 939 static int ceph_get_sb(struct file_system_type *fs_type, 940 int flags, const char *dev_name, void *data, 941 struct vfsmount *mnt) 942 { 943 struct super_block *sb; 944 struct ceph_client *client; 945 int err; 946 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 947 const char *path = NULL; 948 struct ceph_mount_args *args; 949 950 dout("ceph_get_sb\n"); 951 args = parse_mount_args(flags, data, dev_name, &path); 952 if (IS_ERR(args)) { 953 err = PTR_ERR(args); 954 goto out_final; 955 } 956 957 /* create client (which we may/may not use) */ 958 client = ceph_create_client(args); 959 if (IS_ERR(client)) { 960 err = PTR_ERR(client); 961 goto out_final; 962 } 963 964 if (client->mount_args->flags & CEPH_OPT_NOSHARE) 965 compare_super = NULL; 966 sb = sget(fs_type, compare_super, ceph_set_super, client); 967 if (IS_ERR(sb)) { 968 err = PTR_ERR(sb); 969 goto out; 970 } 971 972 if (ceph_sb_to_client(sb) != client) { 973 ceph_destroy_client(client); 974 client = ceph_sb_to_client(sb); 975 dout("get_sb got existing client %p\n", client); 976 } else { 977 dout("get_sb using new client %p\n", client); 978 err = ceph_register_bdi(sb, client); 979 if (err < 0) 980 goto out_splat; 981 } 982 983 err = ceph_mount(client, mnt, path); 984 if (err < 0) 985 goto out_splat; 986 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root, 987 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode)); 988 return 0; 989 990 out_splat: 991 ceph_mdsc_close_sessions(&client->mdsc); 992 deactivate_locked_super(sb); 993 goto out_final; 994 995 out: 996 ceph_destroy_client(client); 997 out_final: 998 dout("ceph_get_sb fail %d\n", err); 999 return err; 1000 } 1001 1002 static void ceph_kill_sb(struct super_block *s) 1003 { 1004 struct ceph_client *client = ceph_sb_to_client(s); 1005 dout("kill_sb %p\n", s); 1006 ceph_mdsc_pre_umount(&client->mdsc); 1007 kill_anon_super(s); /* will call put_super after sb is r/o */ 1008 ceph_destroy_client(client); 1009 } 1010 1011 static struct file_system_type ceph_fs_type = { 1012 .owner = THIS_MODULE, 1013 .name = "ceph", 1014 .get_sb = ceph_get_sb, 1015 .kill_sb = ceph_kill_sb, 1016 .fs_flags = FS_RENAME_DOES_D_MOVE, 1017 }; 1018 1019 #define _STRINGIFY(x) #x 1020 #define STRINGIFY(x) _STRINGIFY(x) 1021 1022 static int __init init_ceph(void) 1023 { 1024 int ret = 0; 1025 1026 ret = ceph_debugfs_init(); 1027 if (ret < 0) 1028 goto out; 1029 1030 ret = ceph_msgr_init(); 1031 if (ret < 0) 1032 goto out_debugfs; 1033 1034 ret = init_caches(); 1035 if (ret) 1036 goto out_msgr; 1037 1038 ceph_caps_init(); 1039 1040 ret = register_filesystem(&ceph_fs_type); 1041 if (ret) 1042 goto out_icache; 1043 1044 pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n", 1045 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL, 1046 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT, 1047 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT); 1048 return 0; 1049 1050 out_icache: 1051 destroy_caches(); 1052 out_msgr: 1053 ceph_msgr_exit(); 1054 out_debugfs: 1055 ceph_debugfs_cleanup(); 1056 out: 1057 return ret; 1058 } 1059 1060 static void __exit exit_ceph(void) 1061 { 1062 dout("exit_ceph\n"); 1063 unregister_filesystem(&ceph_fs_type); 1064 ceph_caps_finalize(); 1065 destroy_caches(); 1066 ceph_msgr_exit(); 1067 ceph_debugfs_cleanup(); 1068 } 1069 1070 module_init(init_ceph); 1071 module_exit(exit_ceph); 1072 1073 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1074 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1075 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1076 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1077 MODULE_LICENSE("GPL"); 1078