1 2 #include "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 "decode.h" 19 #include "super.h" 20 #include "mon_client.h" 21 #include "auth.h" 22 23 /* 24 * Ceph superblock operations 25 * 26 * Handle the basics of mounting, unmounting. 27 */ 28 29 30 /* 31 * find filename portion of a path (/foo/bar/baz -> baz) 32 */ 33 const char *ceph_file_part(const char *s, int len) 34 { 35 const char *e = s + len; 36 37 while (e != s && *(e-1) != '/') 38 e--; 39 return e; 40 } 41 42 43 /* 44 * super ops 45 */ 46 static void ceph_put_super(struct super_block *s) 47 { 48 struct ceph_client *client = ceph_sb_to_client(s); 49 50 dout("put_super\n"); 51 ceph_mdsc_close_sessions(&client->mdsc); 52 53 /* 54 * ensure we release the bdi before put_anon_super releases 55 * the device name. 56 */ 57 if (s->s_bdi == &client->backing_dev_info) { 58 bdi_unregister(&client->backing_dev_info); 59 s->s_bdi = NULL; 60 } 61 62 return; 63 } 64 65 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 66 { 67 struct ceph_client *client = ceph_inode_to_client(dentry->d_inode); 68 struct ceph_monmap *monmap = client->monc.monmap; 69 struct ceph_statfs st; 70 u64 fsid; 71 int err; 72 73 dout("statfs\n"); 74 err = ceph_monc_do_statfs(&client->monc, &st); 75 if (err < 0) 76 return err; 77 78 /* fill in kstatfs */ 79 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 80 81 /* 82 * express utilization in terms of large blocks to avoid 83 * overflow on 32-bit machines. 84 */ 85 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 86 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 87 buf->f_bfree = (le64_to_cpu(st.kb) - le64_to_cpu(st.kb_used)) >> 88 (CEPH_BLOCK_SHIFT-10); 89 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 90 91 buf->f_files = le64_to_cpu(st.num_objects); 92 buf->f_ffree = -1; 93 buf->f_namelen = NAME_MAX; 94 buf->f_frsize = PAGE_CACHE_SIZE; 95 96 /* leave fsid little-endian, regardless of host endianness */ 97 fsid = *(u64 *)(&monmap->fsid) ^ *((u64 *)&monmap->fsid + 1); 98 buf->f_fsid.val[0] = fsid & 0xffffffff; 99 buf->f_fsid.val[1] = fsid >> 32; 100 101 return 0; 102 } 103 104 105 static int ceph_sync_fs(struct super_block *sb, int wait) 106 { 107 struct ceph_client *client = ceph_sb_to_client(sb); 108 109 if (!wait) { 110 dout("sync_fs (non-blocking)\n"); 111 ceph_flush_dirty_caps(&client->mdsc); 112 dout("sync_fs (non-blocking) done\n"); 113 return 0; 114 } 115 116 dout("sync_fs (blocking)\n"); 117 ceph_osdc_sync(&ceph_sb_to_client(sb)->osdc); 118 ceph_mdsc_sync(&ceph_sb_to_client(sb)->mdsc); 119 dout("sync_fs (blocking) done\n"); 120 return 0; 121 } 122 123 static int default_congestion_kb(void) 124 { 125 int congestion_kb; 126 127 /* 128 * Copied from NFS 129 * 130 * congestion size, scale with available memory. 131 * 132 * 64MB: 8192k 133 * 128MB: 11585k 134 * 256MB: 16384k 135 * 512MB: 23170k 136 * 1GB: 32768k 137 * 2GB: 46340k 138 * 4GB: 65536k 139 * 8GB: 92681k 140 * 16GB: 131072k 141 * 142 * This allows larger machines to have larger/more transfers. 143 * Limit the default to 256M 144 */ 145 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 146 if (congestion_kb > 256*1024) 147 congestion_kb = 256*1024; 148 149 return congestion_kb; 150 } 151 152 /** 153 * ceph_show_options - Show mount options in /proc/mounts 154 * @m: seq_file to write to 155 * @mnt: mount descriptor 156 */ 157 static int ceph_show_options(struct seq_file *m, struct vfsmount *mnt) 158 { 159 struct ceph_client *client = ceph_sb_to_client(mnt->mnt_sb); 160 struct ceph_mount_args *args = client->mount_args; 161 162 if (args->flags & CEPH_OPT_FSID) 163 seq_printf(m, ",fsid=%pU", &args->fsid); 164 if (args->flags & CEPH_OPT_NOSHARE) 165 seq_puts(m, ",noshare"); 166 if (args->flags & CEPH_OPT_DIRSTAT) 167 seq_puts(m, ",dirstat"); 168 if ((args->flags & CEPH_OPT_RBYTES) == 0) 169 seq_puts(m, ",norbytes"); 170 if (args->flags & CEPH_OPT_NOCRC) 171 seq_puts(m, ",nocrc"); 172 if (args->flags & CEPH_OPT_NOASYNCREADDIR) 173 seq_puts(m, ",noasyncreaddir"); 174 175 if (args->mount_timeout != CEPH_MOUNT_TIMEOUT_DEFAULT) 176 seq_printf(m, ",mount_timeout=%d", args->mount_timeout); 177 if (args->osd_idle_ttl != CEPH_OSD_IDLE_TTL_DEFAULT) 178 seq_printf(m, ",osd_idle_ttl=%d", args->osd_idle_ttl); 179 if (args->osd_timeout != CEPH_OSD_TIMEOUT_DEFAULT) 180 seq_printf(m, ",osdtimeout=%d", args->osd_timeout); 181 if (args->osd_keepalive_timeout != CEPH_OSD_KEEPALIVE_DEFAULT) 182 seq_printf(m, ",osdkeepalivetimeout=%d", 183 args->osd_keepalive_timeout); 184 if (args->wsize) 185 seq_printf(m, ",wsize=%d", args->wsize); 186 if (args->rsize != CEPH_MOUNT_RSIZE_DEFAULT) 187 seq_printf(m, ",rsize=%d", args->rsize); 188 if (args->congestion_kb != default_congestion_kb()) 189 seq_printf(m, ",write_congestion_kb=%d", args->congestion_kb); 190 if (args->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 191 seq_printf(m, ",caps_wanted_delay_min=%d", 192 args->caps_wanted_delay_min); 193 if (args->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 194 seq_printf(m, ",caps_wanted_delay_max=%d", 195 args->caps_wanted_delay_max); 196 if (args->cap_release_safety != CEPH_CAP_RELEASE_SAFETY_DEFAULT) 197 seq_printf(m, ",cap_release_safety=%d", 198 args->cap_release_safety); 199 if (args->max_readdir != CEPH_MAX_READDIR_DEFAULT) 200 seq_printf(m, ",readdir_max_entries=%d", args->max_readdir); 201 if (args->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 202 seq_printf(m, ",readdir_max_bytes=%d", args->max_readdir_bytes); 203 if (strcmp(args->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 204 seq_printf(m, ",snapdirname=%s", args->snapdir_name); 205 if (args->name) 206 seq_printf(m, ",name=%s", args->name); 207 if (args->secret) 208 seq_puts(m, ",secret=<hidden>"); 209 return 0; 210 } 211 212 /* 213 * caches 214 */ 215 struct kmem_cache *ceph_inode_cachep; 216 struct kmem_cache *ceph_cap_cachep; 217 struct kmem_cache *ceph_dentry_cachep; 218 struct kmem_cache *ceph_file_cachep; 219 220 static void ceph_inode_init_once(void *foo) 221 { 222 struct ceph_inode_info *ci = foo; 223 inode_init_once(&ci->vfs_inode); 224 } 225 226 static int __init init_caches(void) 227 { 228 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 229 sizeof(struct ceph_inode_info), 230 __alignof__(struct ceph_inode_info), 231 (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD), 232 ceph_inode_init_once); 233 if (ceph_inode_cachep == NULL) 234 return -ENOMEM; 235 236 ceph_cap_cachep = KMEM_CACHE(ceph_cap, 237 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 238 if (ceph_cap_cachep == NULL) 239 goto bad_cap; 240 241 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 242 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 243 if (ceph_dentry_cachep == NULL) 244 goto bad_dentry; 245 246 ceph_file_cachep = KMEM_CACHE(ceph_file_info, 247 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 248 if (ceph_file_cachep == NULL) 249 goto bad_file; 250 251 return 0; 252 253 bad_file: 254 kmem_cache_destroy(ceph_dentry_cachep); 255 bad_dentry: 256 kmem_cache_destroy(ceph_cap_cachep); 257 bad_cap: 258 kmem_cache_destroy(ceph_inode_cachep); 259 return -ENOMEM; 260 } 261 262 static void destroy_caches(void) 263 { 264 kmem_cache_destroy(ceph_inode_cachep); 265 kmem_cache_destroy(ceph_cap_cachep); 266 kmem_cache_destroy(ceph_dentry_cachep); 267 kmem_cache_destroy(ceph_file_cachep); 268 } 269 270 271 /* 272 * ceph_umount_begin - initiate forced umount. Tear down down the 273 * mount, skipping steps that may hang while waiting for server(s). 274 */ 275 static void ceph_umount_begin(struct super_block *sb) 276 { 277 struct ceph_client *client = ceph_sb_to_client(sb); 278 279 dout("ceph_umount_begin - starting forced umount\n"); 280 if (!client) 281 return; 282 client->mount_state = CEPH_MOUNT_SHUTDOWN; 283 return; 284 } 285 286 static const struct super_operations ceph_super_ops = { 287 .alloc_inode = ceph_alloc_inode, 288 .destroy_inode = ceph_destroy_inode, 289 .write_inode = ceph_write_inode, 290 .sync_fs = ceph_sync_fs, 291 .put_super = ceph_put_super, 292 .show_options = ceph_show_options, 293 .statfs = ceph_statfs, 294 .umount_begin = ceph_umount_begin, 295 }; 296 297 298 const char *ceph_msg_type_name(int type) 299 { 300 switch (type) { 301 case CEPH_MSG_SHUTDOWN: return "shutdown"; 302 case CEPH_MSG_PING: return "ping"; 303 case CEPH_MSG_AUTH: return "auth"; 304 case CEPH_MSG_AUTH_REPLY: return "auth_reply"; 305 case CEPH_MSG_MON_MAP: return "mon_map"; 306 case CEPH_MSG_MON_GET_MAP: return "mon_get_map"; 307 case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe"; 308 case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack"; 309 case CEPH_MSG_STATFS: return "statfs"; 310 case CEPH_MSG_STATFS_REPLY: return "statfs_reply"; 311 case CEPH_MSG_MDS_MAP: return "mds_map"; 312 case CEPH_MSG_CLIENT_SESSION: return "client_session"; 313 case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect"; 314 case CEPH_MSG_CLIENT_REQUEST: return "client_request"; 315 case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward"; 316 case CEPH_MSG_CLIENT_REPLY: return "client_reply"; 317 case CEPH_MSG_CLIENT_CAPS: return "client_caps"; 318 case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release"; 319 case CEPH_MSG_CLIENT_SNAP: return "client_snap"; 320 case CEPH_MSG_CLIENT_LEASE: return "client_lease"; 321 case CEPH_MSG_OSD_MAP: return "osd_map"; 322 case CEPH_MSG_OSD_OP: return "osd_op"; 323 case CEPH_MSG_OSD_OPREPLY: return "osd_opreply"; 324 default: return "unknown"; 325 } 326 } 327 328 329 /* 330 * mount options 331 */ 332 enum { 333 Opt_wsize, 334 Opt_rsize, 335 Opt_osdtimeout, 336 Opt_osdkeepalivetimeout, 337 Opt_mount_timeout, 338 Opt_osd_idle_ttl, 339 Opt_caps_wanted_delay_min, 340 Opt_caps_wanted_delay_max, 341 Opt_cap_release_safety, 342 Opt_readdir_max_entries, 343 Opt_readdir_max_bytes, 344 Opt_congestion_kb, 345 Opt_last_int, 346 /* int args above */ 347 Opt_fsid, 348 Opt_snapdirname, 349 Opt_name, 350 Opt_secret, 351 Opt_last_string, 352 /* string args above */ 353 Opt_ip, 354 Opt_noshare, 355 Opt_dirstat, 356 Opt_nodirstat, 357 Opt_rbytes, 358 Opt_norbytes, 359 Opt_nocrc, 360 Opt_noasyncreaddir, 361 }; 362 363 static match_table_t arg_tokens = { 364 {Opt_wsize, "wsize=%d"}, 365 {Opt_rsize, "rsize=%d"}, 366 {Opt_osdtimeout, "osdtimeout=%d"}, 367 {Opt_osdkeepalivetimeout, "osdkeepalive=%d"}, 368 {Opt_mount_timeout, "mount_timeout=%d"}, 369 {Opt_osd_idle_ttl, "osd_idle_ttl=%d"}, 370 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 371 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 372 {Opt_cap_release_safety, "cap_release_safety=%d"}, 373 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 374 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 375 {Opt_congestion_kb, "write_congestion_kb=%d"}, 376 /* int args above */ 377 {Opt_fsid, "fsid=%s"}, 378 {Opt_snapdirname, "snapdirname=%s"}, 379 {Opt_name, "name=%s"}, 380 {Opt_secret, "secret=%s"}, 381 /* string args above */ 382 {Opt_ip, "ip=%s"}, 383 {Opt_noshare, "noshare"}, 384 {Opt_dirstat, "dirstat"}, 385 {Opt_nodirstat, "nodirstat"}, 386 {Opt_rbytes, "rbytes"}, 387 {Opt_norbytes, "norbytes"}, 388 {Opt_nocrc, "nocrc"}, 389 {Opt_noasyncreaddir, "noasyncreaddir"}, 390 {-1, NULL} 391 }; 392 393 static int parse_fsid(const char *str, struct ceph_fsid *fsid) 394 { 395 int i = 0; 396 char tmp[3]; 397 int err = -EINVAL; 398 int d; 399 400 dout("parse_fsid '%s'\n", str); 401 tmp[2] = 0; 402 while (*str && i < 16) { 403 if (ispunct(*str)) { 404 str++; 405 continue; 406 } 407 if (!isxdigit(str[0]) || !isxdigit(str[1])) 408 break; 409 tmp[0] = str[0]; 410 tmp[1] = str[1]; 411 if (sscanf(tmp, "%x", &d) < 1) 412 break; 413 fsid->fsid[i] = d & 0xff; 414 i++; 415 str += 2; 416 } 417 418 if (i == 16) 419 err = 0; 420 dout("parse_fsid ret %d got fsid %pU", err, fsid); 421 return err; 422 } 423 424 static struct ceph_mount_args *parse_mount_args(int flags, char *options, 425 const char *dev_name, 426 const char **path) 427 { 428 struct ceph_mount_args *args; 429 const char *c; 430 int err = -ENOMEM; 431 substring_t argstr[MAX_OPT_ARGS]; 432 433 args = kzalloc(sizeof(*args), GFP_KERNEL); 434 if (!args) 435 return ERR_PTR(-ENOMEM); 436 args->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*args->mon_addr), 437 GFP_KERNEL); 438 if (!args->mon_addr) 439 goto out; 440 441 dout("parse_mount_args %p, dev_name '%s'\n", args, dev_name); 442 443 /* start with defaults */ 444 args->sb_flags = flags; 445 args->flags = CEPH_OPT_DEFAULT; 446 args->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT; 447 args->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT; 448 args->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */ 449 args->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT; /* seconds */ 450 args->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 451 args->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 452 args->rsize = CEPH_MOUNT_RSIZE_DEFAULT; 453 args->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 454 args->cap_release_safety = CEPH_CAP_RELEASE_SAFETY_DEFAULT; 455 args->max_readdir = CEPH_MAX_READDIR_DEFAULT; 456 args->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 457 args->congestion_kb = default_congestion_kb(); 458 459 /* ip1[:port1][,ip2[:port2]...]:/subdir/in/fs */ 460 err = -EINVAL; 461 if (!dev_name) 462 goto out; 463 *path = strstr(dev_name, ":/"); 464 if (*path == NULL) { 465 pr_err("device name is missing path (no :/ in %s)\n", 466 dev_name); 467 goto out; 468 } 469 470 /* get mon ip(s) */ 471 err = ceph_parse_ips(dev_name, *path, args->mon_addr, 472 CEPH_MAX_MON, &args->num_mon); 473 if (err < 0) 474 goto out; 475 476 /* path on server */ 477 *path += 2; 478 dout("server path '%s'\n", *path); 479 480 /* parse mount options */ 481 while ((c = strsep(&options, ",")) != NULL) { 482 int token, intval, ret; 483 if (!*c) 484 continue; 485 err = -EINVAL; 486 token = match_token((char *)c, arg_tokens, argstr); 487 if (token < 0) { 488 pr_err("bad mount option at '%s'\n", c); 489 goto out; 490 } 491 if (token < Opt_last_int) { 492 ret = match_int(&argstr[0], &intval); 493 if (ret < 0) { 494 pr_err("bad mount option arg (not int) " 495 "at '%s'\n", c); 496 continue; 497 } 498 dout("got int token %d val %d\n", token, intval); 499 } else if (token > Opt_last_int && token < Opt_last_string) { 500 dout("got string token %d val %s\n", token, 501 argstr[0].from); 502 } else { 503 dout("got token %d\n", token); 504 } 505 switch (token) { 506 case Opt_ip: 507 err = ceph_parse_ips(argstr[0].from, 508 argstr[0].to, 509 &args->my_addr, 510 1, NULL); 511 if (err < 0) 512 goto out; 513 args->flags |= CEPH_OPT_MYIP; 514 break; 515 516 case Opt_fsid: 517 err = parse_fsid(argstr[0].from, &args->fsid); 518 if (err == 0) 519 args->flags |= CEPH_OPT_FSID; 520 break; 521 case Opt_snapdirname: 522 kfree(args->snapdir_name); 523 args->snapdir_name = kstrndup(argstr[0].from, 524 argstr[0].to-argstr[0].from, 525 GFP_KERNEL); 526 break; 527 case Opt_name: 528 args->name = kstrndup(argstr[0].from, 529 argstr[0].to-argstr[0].from, 530 GFP_KERNEL); 531 break; 532 case Opt_secret: 533 args->secret = kstrndup(argstr[0].from, 534 argstr[0].to-argstr[0].from, 535 GFP_KERNEL); 536 break; 537 538 /* misc */ 539 case Opt_wsize: 540 args->wsize = intval; 541 break; 542 case Opt_rsize: 543 args->rsize = intval; 544 break; 545 case Opt_osdtimeout: 546 args->osd_timeout = intval; 547 break; 548 case Opt_osdkeepalivetimeout: 549 args->osd_keepalive_timeout = intval; 550 break; 551 case Opt_osd_idle_ttl: 552 args->osd_idle_ttl = intval; 553 break; 554 case Opt_mount_timeout: 555 args->mount_timeout = intval; 556 break; 557 case Opt_caps_wanted_delay_min: 558 args->caps_wanted_delay_min = intval; 559 break; 560 case Opt_caps_wanted_delay_max: 561 args->caps_wanted_delay_max = intval; 562 break; 563 case Opt_readdir_max_entries: 564 args->max_readdir = intval; 565 break; 566 case Opt_readdir_max_bytes: 567 args->max_readdir_bytes = intval; 568 break; 569 case Opt_congestion_kb: 570 args->congestion_kb = intval; 571 break; 572 573 case Opt_noshare: 574 args->flags |= CEPH_OPT_NOSHARE; 575 break; 576 577 case Opt_dirstat: 578 args->flags |= CEPH_OPT_DIRSTAT; 579 break; 580 case Opt_nodirstat: 581 args->flags &= ~CEPH_OPT_DIRSTAT; 582 break; 583 case Opt_rbytes: 584 args->flags |= CEPH_OPT_RBYTES; 585 break; 586 case Opt_norbytes: 587 args->flags &= ~CEPH_OPT_RBYTES; 588 break; 589 case Opt_nocrc: 590 args->flags |= CEPH_OPT_NOCRC; 591 break; 592 case Opt_noasyncreaddir: 593 args->flags |= CEPH_OPT_NOASYNCREADDIR; 594 break; 595 596 default: 597 BUG_ON(token); 598 } 599 } 600 return args; 601 602 out: 603 kfree(args->mon_addr); 604 kfree(args); 605 return ERR_PTR(err); 606 } 607 608 static void destroy_mount_args(struct ceph_mount_args *args) 609 { 610 dout("destroy_mount_args %p\n", args); 611 kfree(args->snapdir_name); 612 args->snapdir_name = NULL; 613 kfree(args->name); 614 args->name = NULL; 615 kfree(args->secret); 616 args->secret = NULL; 617 kfree(args); 618 } 619 620 /* 621 * create a fresh client instance 622 */ 623 static struct ceph_client *ceph_create_client(struct ceph_mount_args *args) 624 { 625 struct ceph_client *client; 626 int err = -ENOMEM; 627 628 client = kzalloc(sizeof(*client), GFP_KERNEL); 629 if (client == NULL) 630 return ERR_PTR(-ENOMEM); 631 632 mutex_init(&client->mount_mutex); 633 634 init_waitqueue_head(&client->auth_wq); 635 636 client->sb = NULL; 637 client->mount_state = CEPH_MOUNT_MOUNTING; 638 client->mount_args = args; 639 640 client->msgr = NULL; 641 642 client->auth_err = 0; 643 atomic_long_set(&client->writeback_count, 0); 644 645 err = bdi_init(&client->backing_dev_info); 646 if (err < 0) 647 goto fail; 648 649 err = -ENOMEM; 650 client->wb_wq = create_workqueue("ceph-writeback"); 651 if (client->wb_wq == NULL) 652 goto fail_bdi; 653 client->pg_inv_wq = create_singlethread_workqueue("ceph-pg-invalid"); 654 if (client->pg_inv_wq == NULL) 655 goto fail_wb_wq; 656 client->trunc_wq = create_singlethread_workqueue("ceph-trunc"); 657 if (client->trunc_wq == NULL) 658 goto fail_pg_inv_wq; 659 660 /* set up mempools */ 661 err = -ENOMEM; 662 client->wb_pagevec_pool = mempool_create_kmalloc_pool(10, 663 client->mount_args->wsize >> PAGE_CACHE_SHIFT); 664 if (!client->wb_pagevec_pool) 665 goto fail_trunc_wq; 666 667 /* caps */ 668 client->min_caps = args->max_readdir; 669 670 /* subsystems */ 671 err = ceph_monc_init(&client->monc, client); 672 if (err < 0) 673 goto fail_mempool; 674 err = ceph_osdc_init(&client->osdc, client); 675 if (err < 0) 676 goto fail_monc; 677 err = ceph_mdsc_init(&client->mdsc, client); 678 if (err < 0) 679 goto fail_osdc; 680 return client; 681 682 fail_osdc: 683 ceph_osdc_stop(&client->osdc); 684 fail_monc: 685 ceph_monc_stop(&client->monc); 686 fail_mempool: 687 mempool_destroy(client->wb_pagevec_pool); 688 fail_trunc_wq: 689 destroy_workqueue(client->trunc_wq); 690 fail_pg_inv_wq: 691 destroy_workqueue(client->pg_inv_wq); 692 fail_wb_wq: 693 destroy_workqueue(client->wb_wq); 694 fail_bdi: 695 bdi_destroy(&client->backing_dev_info); 696 fail: 697 kfree(client); 698 return ERR_PTR(err); 699 } 700 701 static void ceph_destroy_client(struct ceph_client *client) 702 { 703 dout("destroy_client %p\n", client); 704 705 /* unmount */ 706 ceph_mdsc_stop(&client->mdsc); 707 ceph_osdc_stop(&client->osdc); 708 709 /* 710 * make sure mds and osd connections close out before destroying 711 * the auth module, which is needed to free those connections' 712 * ceph_authorizers. 713 */ 714 ceph_msgr_flush(); 715 716 ceph_monc_stop(&client->monc); 717 718 ceph_debugfs_client_cleanup(client); 719 destroy_workqueue(client->wb_wq); 720 destroy_workqueue(client->pg_inv_wq); 721 destroy_workqueue(client->trunc_wq); 722 723 bdi_destroy(&client->backing_dev_info); 724 725 if (client->msgr) 726 ceph_messenger_destroy(client->msgr); 727 mempool_destroy(client->wb_pagevec_pool); 728 729 destroy_mount_args(client->mount_args); 730 731 kfree(client); 732 dout("destroy_client %p done\n", client); 733 } 734 735 /* 736 * Initially learn our fsid, or verify an fsid matches. 737 */ 738 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid) 739 { 740 if (client->have_fsid) { 741 if (ceph_fsid_compare(&client->fsid, fsid)) { 742 pr_err("bad fsid, had %pU got %pU", 743 &client->fsid, fsid); 744 return -1; 745 } 746 } else { 747 pr_info("client%lld fsid %pU\n", client->monc.auth->global_id, 748 fsid); 749 memcpy(&client->fsid, fsid, sizeof(*fsid)); 750 ceph_debugfs_client_init(client); 751 client->have_fsid = true; 752 } 753 return 0; 754 } 755 756 /* 757 * true if we have the mon map (and have thus joined the cluster) 758 */ 759 static int have_mon_and_osd_map(struct ceph_client *client) 760 { 761 return client->monc.monmap && client->monc.monmap->epoch && 762 client->osdc.osdmap && client->osdc.osdmap->epoch; 763 } 764 765 /* 766 * Bootstrap mount by opening the root directory. Note the mount 767 * @started time from caller, and time out if this takes too long. 768 */ 769 static struct dentry *open_root_dentry(struct ceph_client *client, 770 const char *path, 771 unsigned long started) 772 { 773 struct ceph_mds_client *mdsc = &client->mdsc; 774 struct ceph_mds_request *req = NULL; 775 int err; 776 struct dentry *root; 777 778 /* open dir */ 779 dout("open_root_inode opening '%s'\n", path); 780 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 781 if (IS_ERR(req)) 782 return ERR_CAST(req); 783 req->r_path1 = kstrdup(path, GFP_NOFS); 784 req->r_ino1.ino = CEPH_INO_ROOT; 785 req->r_ino1.snap = CEPH_NOSNAP; 786 req->r_started = started; 787 req->r_timeout = client->mount_args->mount_timeout * HZ; 788 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 789 req->r_num_caps = 2; 790 err = ceph_mdsc_do_request(mdsc, NULL, req); 791 if (err == 0) { 792 dout("open_root_inode success\n"); 793 if (ceph_ino(req->r_target_inode) == CEPH_INO_ROOT && 794 client->sb->s_root == NULL) 795 root = d_alloc_root(req->r_target_inode); 796 else 797 root = d_obtain_alias(req->r_target_inode); 798 req->r_target_inode = NULL; 799 dout("open_root_inode success, root dentry is %p\n", root); 800 } else { 801 root = ERR_PTR(err); 802 } 803 ceph_mdsc_put_request(req); 804 return root; 805 } 806 807 /* 808 * mount: join the ceph cluster, and open root directory. 809 */ 810 static int ceph_mount(struct ceph_client *client, struct vfsmount *mnt, 811 const char *path) 812 { 813 struct ceph_entity_addr *myaddr = NULL; 814 int err; 815 unsigned long timeout = client->mount_args->mount_timeout * HZ; 816 unsigned long started = jiffies; /* note the start time */ 817 struct dentry *root; 818 819 dout("mount start\n"); 820 mutex_lock(&client->mount_mutex); 821 822 /* initialize the messenger */ 823 if (client->msgr == NULL) { 824 if (ceph_test_opt(client, MYIP)) 825 myaddr = &client->mount_args->my_addr; 826 client->msgr = ceph_messenger_create(myaddr); 827 if (IS_ERR(client->msgr)) { 828 err = PTR_ERR(client->msgr); 829 client->msgr = NULL; 830 goto out; 831 } 832 client->msgr->nocrc = ceph_test_opt(client, NOCRC); 833 } 834 835 /* open session, and wait for mon, mds, and osd maps */ 836 err = ceph_monc_open_session(&client->monc); 837 if (err < 0) 838 goto out; 839 840 while (!have_mon_and_osd_map(client)) { 841 err = -EIO; 842 if (timeout && time_after_eq(jiffies, started + timeout)) 843 goto out; 844 845 /* wait */ 846 dout("mount waiting for mon_map\n"); 847 err = wait_event_interruptible_timeout(client->auth_wq, 848 have_mon_and_osd_map(client) || (client->auth_err < 0), 849 timeout); 850 if (err == -EINTR || err == -ERESTARTSYS) 851 goto out; 852 if (client->auth_err < 0) { 853 err = client->auth_err; 854 goto out; 855 } 856 } 857 858 dout("mount opening root\n"); 859 root = open_root_dentry(client, "", started); 860 if (IS_ERR(root)) { 861 err = PTR_ERR(root); 862 goto out; 863 } 864 if (client->sb->s_root) 865 dput(root); 866 else 867 client->sb->s_root = root; 868 869 if (path[0] == 0) { 870 dget(root); 871 } else { 872 dout("mount opening base mountpoint\n"); 873 root = open_root_dentry(client, path, started); 874 if (IS_ERR(root)) { 875 err = PTR_ERR(root); 876 dput(client->sb->s_root); 877 client->sb->s_root = NULL; 878 goto out; 879 } 880 } 881 882 mnt->mnt_root = root; 883 mnt->mnt_sb = client->sb; 884 885 client->mount_state = CEPH_MOUNT_MOUNTED; 886 dout("mount success\n"); 887 err = 0; 888 889 out: 890 mutex_unlock(&client->mount_mutex); 891 return err; 892 } 893 894 static int ceph_set_super(struct super_block *s, void *data) 895 { 896 struct ceph_client *client = data; 897 int ret; 898 899 dout("set_super %p data %p\n", s, data); 900 901 s->s_flags = client->mount_args->sb_flags; 902 s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */ 903 904 s->s_fs_info = client; 905 client->sb = s; 906 907 s->s_op = &ceph_super_ops; 908 s->s_export_op = &ceph_export_ops; 909 910 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 911 912 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 913 if (ret != 0) 914 goto fail; 915 916 return ret; 917 918 fail: 919 s->s_fs_info = NULL; 920 client->sb = NULL; 921 return ret; 922 } 923 924 /* 925 * share superblock if same fs AND options 926 */ 927 static int ceph_compare_super(struct super_block *sb, void *data) 928 { 929 struct ceph_client *new = data; 930 struct ceph_mount_args *args = new->mount_args; 931 struct ceph_client *other = ceph_sb_to_client(sb); 932 int i; 933 934 dout("ceph_compare_super %p\n", sb); 935 if (args->flags & CEPH_OPT_FSID) { 936 if (ceph_fsid_compare(&args->fsid, &other->fsid)) { 937 dout("fsid doesn't match\n"); 938 return 0; 939 } 940 } else { 941 /* do we share (a) monitor? */ 942 for (i = 0; i < new->monc.monmap->num_mon; i++) 943 if (ceph_monmap_contains(other->monc.monmap, 944 &new->monc.monmap->mon_inst[i].addr)) 945 break; 946 if (i == new->monc.monmap->num_mon) { 947 dout("mon ip not part of monmap\n"); 948 return 0; 949 } 950 dout("mon ip matches existing sb %p\n", sb); 951 } 952 if (args->sb_flags != other->mount_args->sb_flags) { 953 dout("flags differ\n"); 954 return 0; 955 } 956 return 1; 957 } 958 959 /* 960 * construct our own bdi so we can control readahead, etc. 961 */ 962 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 963 964 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client) 965 { 966 int err; 967 968 /* set ra_pages based on rsize mount option? */ 969 if (client->mount_args->rsize >= PAGE_CACHE_SIZE) 970 client->backing_dev_info.ra_pages = 971 (client->mount_args->rsize + PAGE_CACHE_SIZE - 1) 972 >> PAGE_SHIFT; 973 err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d", 974 atomic_long_inc_return(&bdi_seq)); 975 if (!err) 976 sb->s_bdi = &client->backing_dev_info; 977 return err; 978 } 979 980 static int ceph_get_sb(struct file_system_type *fs_type, 981 int flags, const char *dev_name, void *data, 982 struct vfsmount *mnt) 983 { 984 struct super_block *sb; 985 struct ceph_client *client; 986 int err; 987 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 988 const char *path = NULL; 989 struct ceph_mount_args *args; 990 991 dout("ceph_get_sb\n"); 992 args = parse_mount_args(flags, data, dev_name, &path); 993 if (IS_ERR(args)) { 994 err = PTR_ERR(args); 995 goto out_final; 996 } 997 998 /* create client (which we may/may not use) */ 999 client = ceph_create_client(args); 1000 if (IS_ERR(client)) { 1001 err = PTR_ERR(client); 1002 goto out_final; 1003 } 1004 1005 if (client->mount_args->flags & CEPH_OPT_NOSHARE) 1006 compare_super = NULL; 1007 sb = sget(fs_type, compare_super, ceph_set_super, client); 1008 if (IS_ERR(sb)) { 1009 err = PTR_ERR(sb); 1010 goto out; 1011 } 1012 1013 if (ceph_sb_to_client(sb) != client) { 1014 ceph_destroy_client(client); 1015 client = ceph_sb_to_client(sb); 1016 dout("get_sb got existing client %p\n", client); 1017 } else { 1018 dout("get_sb using new client %p\n", client); 1019 err = ceph_register_bdi(sb, client); 1020 if (err < 0) 1021 goto out_splat; 1022 } 1023 1024 err = ceph_mount(client, mnt, path); 1025 if (err < 0) 1026 goto out_splat; 1027 dout("root %p inode %p ino %llx.%llx\n", mnt->mnt_root, 1028 mnt->mnt_root->d_inode, ceph_vinop(mnt->mnt_root->d_inode)); 1029 return 0; 1030 1031 out_splat: 1032 ceph_mdsc_close_sessions(&client->mdsc); 1033 deactivate_locked_super(sb); 1034 goto out_final; 1035 1036 out: 1037 ceph_destroy_client(client); 1038 out_final: 1039 dout("ceph_get_sb fail %d\n", err); 1040 return err; 1041 } 1042 1043 static void ceph_kill_sb(struct super_block *s) 1044 { 1045 struct ceph_client *client = ceph_sb_to_client(s); 1046 dout("kill_sb %p\n", s); 1047 ceph_mdsc_pre_umount(&client->mdsc); 1048 kill_anon_super(s); /* will call put_super after sb is r/o */ 1049 ceph_destroy_client(client); 1050 } 1051 1052 static struct file_system_type ceph_fs_type = { 1053 .owner = THIS_MODULE, 1054 .name = "ceph", 1055 .get_sb = ceph_get_sb, 1056 .kill_sb = ceph_kill_sb, 1057 .fs_flags = FS_RENAME_DOES_D_MOVE, 1058 }; 1059 1060 #define _STRINGIFY(x) #x 1061 #define STRINGIFY(x) _STRINGIFY(x) 1062 1063 static int __init init_ceph(void) 1064 { 1065 int ret = 0; 1066 1067 ret = ceph_debugfs_init(); 1068 if (ret < 0) 1069 goto out; 1070 1071 ret = ceph_msgr_init(); 1072 if (ret < 0) 1073 goto out_debugfs; 1074 1075 ret = init_caches(); 1076 if (ret) 1077 goto out_msgr; 1078 1079 ret = register_filesystem(&ceph_fs_type); 1080 if (ret) 1081 goto out_icache; 1082 1083 pr_info("loaded (mon/mds/osd proto %d/%d/%d, osdmap %d/%d %d/%d)\n", 1084 CEPH_MONC_PROTOCOL, CEPH_MDSC_PROTOCOL, CEPH_OSDC_PROTOCOL, 1085 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT, 1086 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT); 1087 return 0; 1088 1089 out_icache: 1090 destroy_caches(); 1091 out_msgr: 1092 ceph_msgr_exit(); 1093 out_debugfs: 1094 ceph_debugfs_cleanup(); 1095 out: 1096 return ret; 1097 } 1098 1099 static void __exit exit_ceph(void) 1100 { 1101 dout("exit_ceph\n"); 1102 unregister_filesystem(&ceph_fs_type); 1103 destroy_caches(); 1104 ceph_msgr_exit(); 1105 ceph_debugfs_cleanup(); 1106 } 1107 1108 module_init(init_ceph); 1109 module_exit(exit_ceph); 1110 1111 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1112 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1113 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1114 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1115 MODULE_LICENSE("GPL"); 1116