1 2 #include <linux/ceph/ceph_debug.h> 3 4 #include <linux/backing-dev.h> 5 #include <linux/ctype.h> 6 #include <linux/fs.h> 7 #include <linux/inet.h> 8 #include <linux/in6.h> 9 #include <linux/module.h> 10 #include <linux/mount.h> 11 #include <linux/parser.h> 12 #include <linux/sched.h> 13 #include <linux/seq_file.h> 14 #include <linux/slab.h> 15 #include <linux/statfs.h> 16 #include <linux/string.h> 17 18 #include "super.h" 19 #include "mds_client.h" 20 #include "cache.h" 21 22 #include <linux/ceph/ceph_features.h> 23 #include <linux/ceph/decode.h> 24 #include <linux/ceph/mon_client.h> 25 #include <linux/ceph/auth.h> 26 #include <linux/ceph/debugfs.h> 27 28 /* 29 * Ceph superblock operations 30 * 31 * Handle the basics of mounting, unmounting. 32 */ 33 34 /* 35 * super ops 36 */ 37 static void ceph_put_super(struct super_block *s) 38 { 39 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 40 41 dout("put_super\n"); 42 ceph_mdsc_close_sessions(fsc->mdsc); 43 } 44 45 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 46 { 47 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); 48 struct ceph_mon_client *monc = &fsc->client->monc; 49 struct ceph_statfs st; 50 u64 fsid; 51 int err; 52 u64 data_pool; 53 54 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) { 55 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0]; 56 } else { 57 data_pool = CEPH_NOPOOL; 58 } 59 60 dout("statfs\n"); 61 err = ceph_monc_do_statfs(monc, data_pool, &st); 62 if (err < 0) 63 return err; 64 65 /* fill in kstatfs */ 66 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 67 68 /* 69 * express utilization in terms of large blocks to avoid 70 * overflow on 32-bit machines. 71 * 72 * NOTE: for the time being, we make bsize == frsize to humor 73 * not-yet-ancient versions of glibc that are broken. 74 * Someday, we will probably want to report a real block 75 * size... whatever that may mean for a network file system! 76 */ 77 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 78 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 79 80 /* 81 * By default use root quota for stats; fallback to overall filesystem 82 * usage if using 'noquotadf' mount option or if the root dir doesn't 83 * have max_bytes quota set. 84 */ 85 if (ceph_test_mount_opt(fsc, NOQUOTADF) || 86 !ceph_quota_update_statfs(fsc, buf)) { 87 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 88 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 89 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 90 } 91 92 buf->f_files = le64_to_cpu(st.num_objects); 93 buf->f_ffree = -1; 94 buf->f_namelen = NAME_MAX; 95 96 /* Must convert the fsid, for consistent values across arches */ 97 mutex_lock(&monc->mutex); 98 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^ 99 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1)); 100 mutex_unlock(&monc->mutex); 101 102 buf->f_fsid.val[0] = fsid & 0xffffffff; 103 buf->f_fsid.val[1] = fsid >> 32; 104 105 return 0; 106 } 107 108 109 static int ceph_sync_fs(struct super_block *sb, int wait) 110 { 111 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 112 113 if (!wait) { 114 dout("sync_fs (non-blocking)\n"); 115 ceph_flush_dirty_caps(fsc->mdsc); 116 dout("sync_fs (non-blocking) done\n"); 117 return 0; 118 } 119 120 dout("sync_fs (blocking)\n"); 121 ceph_osdc_sync(&fsc->client->osdc); 122 ceph_mdsc_sync(fsc->mdsc); 123 dout("sync_fs (blocking) done\n"); 124 return 0; 125 } 126 127 /* 128 * mount options 129 */ 130 enum { 131 Opt_wsize, 132 Opt_rsize, 133 Opt_rasize, 134 Opt_caps_wanted_delay_min, 135 Opt_caps_wanted_delay_max, 136 Opt_readdir_max_entries, 137 Opt_readdir_max_bytes, 138 Opt_congestion_kb, 139 Opt_last_int, 140 /* int args above */ 141 Opt_snapdirname, 142 Opt_mds_namespace, 143 Opt_fscache_uniq, 144 Opt_last_string, 145 /* string args above */ 146 Opt_dirstat, 147 Opt_nodirstat, 148 Opt_rbytes, 149 Opt_norbytes, 150 Opt_asyncreaddir, 151 Opt_noasyncreaddir, 152 Opt_dcache, 153 Opt_nodcache, 154 Opt_ino32, 155 Opt_noino32, 156 Opt_fscache, 157 Opt_nofscache, 158 Opt_poolperm, 159 Opt_nopoolperm, 160 Opt_require_active_mds, 161 Opt_norequire_active_mds, 162 #ifdef CONFIG_CEPH_FS_POSIX_ACL 163 Opt_acl, 164 #endif 165 Opt_noacl, 166 Opt_quotadf, 167 Opt_noquotadf, 168 Opt_copyfrom, 169 Opt_nocopyfrom, 170 }; 171 172 static match_table_t fsopt_tokens = { 173 {Opt_wsize, "wsize=%d"}, 174 {Opt_rsize, "rsize=%d"}, 175 {Opt_rasize, "rasize=%d"}, 176 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 177 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 178 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 179 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 180 {Opt_congestion_kb, "write_congestion_kb=%d"}, 181 /* int args above */ 182 {Opt_snapdirname, "snapdirname=%s"}, 183 {Opt_mds_namespace, "mds_namespace=%s"}, 184 {Opt_fscache_uniq, "fsc=%s"}, 185 /* string args above */ 186 {Opt_dirstat, "dirstat"}, 187 {Opt_nodirstat, "nodirstat"}, 188 {Opt_rbytes, "rbytes"}, 189 {Opt_norbytes, "norbytes"}, 190 {Opt_asyncreaddir, "asyncreaddir"}, 191 {Opt_noasyncreaddir, "noasyncreaddir"}, 192 {Opt_dcache, "dcache"}, 193 {Opt_nodcache, "nodcache"}, 194 {Opt_ino32, "ino32"}, 195 {Opt_noino32, "noino32"}, 196 {Opt_fscache, "fsc"}, 197 {Opt_nofscache, "nofsc"}, 198 {Opt_poolperm, "poolperm"}, 199 {Opt_nopoolperm, "nopoolperm"}, 200 {Opt_require_active_mds, "require_active_mds"}, 201 {Opt_norequire_active_mds, "norequire_active_mds"}, 202 #ifdef CONFIG_CEPH_FS_POSIX_ACL 203 {Opt_acl, "acl"}, 204 #endif 205 {Opt_noacl, "noacl"}, 206 {Opt_quotadf, "quotadf"}, 207 {Opt_noquotadf, "noquotadf"}, 208 {Opt_copyfrom, "copyfrom"}, 209 {Opt_nocopyfrom, "nocopyfrom"}, 210 {-1, NULL} 211 }; 212 213 static int parse_fsopt_token(char *c, void *private) 214 { 215 struct ceph_mount_options *fsopt = private; 216 substring_t argstr[MAX_OPT_ARGS]; 217 int token, intval, ret; 218 219 token = match_token((char *)c, fsopt_tokens, argstr); 220 if (token < 0) 221 return -EINVAL; 222 223 if (token < Opt_last_int) { 224 ret = match_int(&argstr[0], &intval); 225 if (ret < 0) { 226 pr_err("bad option arg (not int) at '%s'\n", c); 227 return ret; 228 } 229 dout("got int token %d val %d\n", token, intval); 230 } else if (token > Opt_last_int && token < Opt_last_string) { 231 dout("got string token %d val %s\n", token, 232 argstr[0].from); 233 } else { 234 dout("got token %d\n", token); 235 } 236 237 switch (token) { 238 case Opt_snapdirname: 239 kfree(fsopt->snapdir_name); 240 fsopt->snapdir_name = kstrndup(argstr[0].from, 241 argstr[0].to-argstr[0].from, 242 GFP_KERNEL); 243 if (!fsopt->snapdir_name) 244 return -ENOMEM; 245 break; 246 case Opt_mds_namespace: 247 kfree(fsopt->mds_namespace); 248 fsopt->mds_namespace = kstrndup(argstr[0].from, 249 argstr[0].to-argstr[0].from, 250 GFP_KERNEL); 251 if (!fsopt->mds_namespace) 252 return -ENOMEM; 253 break; 254 case Opt_fscache_uniq: 255 kfree(fsopt->fscache_uniq); 256 fsopt->fscache_uniq = kstrndup(argstr[0].from, 257 argstr[0].to-argstr[0].from, 258 GFP_KERNEL); 259 if (!fsopt->fscache_uniq) 260 return -ENOMEM; 261 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 262 break; 263 /* misc */ 264 case Opt_wsize: 265 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE) 266 return -EINVAL; 267 fsopt->wsize = ALIGN(intval, PAGE_SIZE); 268 break; 269 case Opt_rsize: 270 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE) 271 return -EINVAL; 272 fsopt->rsize = ALIGN(intval, PAGE_SIZE); 273 break; 274 case Opt_rasize: 275 if (intval < 0) 276 return -EINVAL; 277 fsopt->rasize = ALIGN(intval, PAGE_SIZE); 278 break; 279 case Opt_caps_wanted_delay_min: 280 if (intval < 1) 281 return -EINVAL; 282 fsopt->caps_wanted_delay_min = intval; 283 break; 284 case Opt_caps_wanted_delay_max: 285 if (intval < 1) 286 return -EINVAL; 287 fsopt->caps_wanted_delay_max = intval; 288 break; 289 case Opt_readdir_max_entries: 290 if (intval < 1) 291 return -EINVAL; 292 fsopt->max_readdir = intval; 293 break; 294 case Opt_readdir_max_bytes: 295 if (intval < (int)PAGE_SIZE && intval != 0) 296 return -EINVAL; 297 fsopt->max_readdir_bytes = intval; 298 break; 299 case Opt_congestion_kb: 300 if (intval < 1024) /* at least 1M */ 301 return -EINVAL; 302 fsopt->congestion_kb = intval; 303 break; 304 case Opt_dirstat: 305 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 306 break; 307 case Opt_nodirstat: 308 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 309 break; 310 case Opt_rbytes: 311 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 312 break; 313 case Opt_norbytes: 314 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 315 break; 316 case Opt_asyncreaddir: 317 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 318 break; 319 case Opt_noasyncreaddir: 320 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 321 break; 322 case Opt_dcache: 323 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 324 break; 325 case Opt_nodcache: 326 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 327 break; 328 case Opt_ino32: 329 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 330 break; 331 case Opt_noino32: 332 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 333 break; 334 case Opt_fscache: 335 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 336 kfree(fsopt->fscache_uniq); 337 fsopt->fscache_uniq = NULL; 338 break; 339 case Opt_nofscache: 340 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 341 kfree(fsopt->fscache_uniq); 342 fsopt->fscache_uniq = NULL; 343 break; 344 case Opt_poolperm: 345 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 346 break; 347 case Opt_nopoolperm: 348 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 349 break; 350 case Opt_require_active_mds: 351 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT; 352 break; 353 case Opt_norequire_active_mds: 354 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT; 355 break; 356 case Opt_quotadf: 357 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF; 358 break; 359 case Opt_noquotadf: 360 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF; 361 break; 362 case Opt_copyfrom: 363 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM; 364 break; 365 case Opt_nocopyfrom: 366 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM; 367 break; 368 #ifdef CONFIG_CEPH_FS_POSIX_ACL 369 case Opt_acl: 370 fsopt->sb_flags |= SB_POSIXACL; 371 break; 372 #endif 373 case Opt_noacl: 374 fsopt->sb_flags &= ~SB_POSIXACL; 375 break; 376 default: 377 BUG_ON(token); 378 } 379 return 0; 380 } 381 382 static void destroy_mount_options(struct ceph_mount_options *args) 383 { 384 dout("destroy_mount_options %p\n", args); 385 kfree(args->snapdir_name); 386 kfree(args->mds_namespace); 387 kfree(args->server_path); 388 kfree(args->fscache_uniq); 389 kfree(args); 390 } 391 392 static int strcmp_null(const char *s1, const char *s2) 393 { 394 if (!s1 && !s2) 395 return 0; 396 if (s1 && !s2) 397 return -1; 398 if (!s1 && s2) 399 return 1; 400 return strcmp(s1, s2); 401 } 402 403 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 404 struct ceph_options *new_opt, 405 struct ceph_fs_client *fsc) 406 { 407 struct ceph_mount_options *fsopt1 = new_fsopt; 408 struct ceph_mount_options *fsopt2 = fsc->mount_options; 409 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 410 int ret; 411 412 ret = memcmp(fsopt1, fsopt2, ofs); 413 if (ret) 414 return ret; 415 416 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 417 if (ret) 418 return ret; 419 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); 420 if (ret) 421 return ret; 422 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 423 if (ret) 424 return ret; 425 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq); 426 if (ret) 427 return ret; 428 429 return ceph_compare_options(new_opt, fsc->client); 430 } 431 432 static int parse_mount_options(struct ceph_mount_options **pfsopt, 433 struct ceph_options **popt, 434 int flags, char *options, 435 const char *dev_name) 436 { 437 struct ceph_mount_options *fsopt; 438 const char *dev_name_end; 439 int err; 440 441 if (!dev_name || !*dev_name) 442 return -EINVAL; 443 444 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 445 if (!fsopt) 446 return -ENOMEM; 447 448 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 449 450 fsopt->sb_flags = flags; 451 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 452 453 fsopt->wsize = CEPH_MAX_WRITE_SIZE; 454 fsopt->rsize = CEPH_MAX_READ_SIZE; 455 fsopt->rasize = CEPH_RASIZE_DEFAULT; 456 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 457 if (!fsopt->snapdir_name) { 458 err = -ENOMEM; 459 goto out; 460 } 461 462 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 463 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 464 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 465 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 466 fsopt->congestion_kb = default_congestion_kb(); 467 468 /* 469 * Distinguish the server list from the path in "dev_name". 470 * Internally we do not include the leading '/' in the path. 471 * 472 * "dev_name" will look like: 473 * <server_spec>[,<server_spec>...]:[<path>] 474 * where 475 * <server_spec> is <ip>[:<port>] 476 * <path> is optional, but if present must begin with '/' 477 */ 478 dev_name_end = strchr(dev_name, '/'); 479 if (dev_name_end) { 480 if (strlen(dev_name_end) > 1) { 481 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 482 if (!fsopt->server_path) { 483 err = -ENOMEM; 484 goto out; 485 } 486 } 487 } else { 488 dev_name_end = dev_name + strlen(dev_name); 489 } 490 err = -EINVAL; 491 dev_name_end--; /* back up to ':' separator */ 492 if (dev_name_end < dev_name || *dev_name_end != ':') { 493 pr_err("device name is missing path (no : separator in %s)\n", 494 dev_name); 495 goto out; 496 } 497 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 498 if (fsopt->server_path) 499 dout("server path '%s'\n", fsopt->server_path); 500 501 *popt = ceph_parse_options(options, dev_name, dev_name_end, 502 parse_fsopt_token, (void *)fsopt); 503 if (IS_ERR(*popt)) { 504 err = PTR_ERR(*popt); 505 goto out; 506 } 507 508 /* success */ 509 *pfsopt = fsopt; 510 return 0; 511 512 out: 513 destroy_mount_options(fsopt); 514 return err; 515 } 516 517 /** 518 * ceph_show_options - Show mount options in /proc/mounts 519 * @m: seq_file to write to 520 * @root: root of that (sub)tree 521 */ 522 static int ceph_show_options(struct seq_file *m, struct dentry *root) 523 { 524 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 525 struct ceph_mount_options *fsopt = fsc->mount_options; 526 size_t pos; 527 int ret; 528 529 /* a comma between MNT/MS and client options */ 530 seq_putc(m, ','); 531 pos = m->count; 532 533 ret = ceph_print_client_options(m, fsc->client); 534 if (ret) 535 return ret; 536 537 /* retract our comma if no client options */ 538 if (m->count == pos) 539 m->count--; 540 541 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 542 seq_puts(m, ",dirstat"); 543 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 544 seq_puts(m, ",rbytes"); 545 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 546 seq_puts(m, ",noasyncreaddir"); 547 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 548 seq_puts(m, ",nodcache"); 549 if (fsopt->flags & CEPH_MOUNT_OPT_INO32) 550 seq_puts(m, ",ino32"); 551 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) { 552 seq_show_option(m, "fsc", fsopt->fscache_uniq); 553 } 554 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 555 seq_puts(m, ",nopoolperm"); 556 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF) 557 seq_puts(m, ",noquotadf"); 558 559 #ifdef CONFIG_CEPH_FS_POSIX_ACL 560 if (fsopt->sb_flags & SB_POSIXACL) 561 seq_puts(m, ",acl"); 562 else 563 seq_puts(m, ",noacl"); 564 #endif 565 566 if (fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) 567 seq_puts(m, ",nocopyfrom"); 568 569 if (fsopt->mds_namespace) 570 seq_show_option(m, "mds_namespace", fsopt->mds_namespace); 571 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE) 572 seq_printf(m, ",wsize=%d", fsopt->wsize); 573 if (fsopt->rsize != CEPH_MAX_READ_SIZE) 574 seq_printf(m, ",rsize=%d", fsopt->rsize); 575 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 576 seq_printf(m, ",rasize=%d", fsopt->rasize); 577 if (fsopt->congestion_kb != default_congestion_kb()) 578 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 579 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 580 seq_printf(m, ",caps_wanted_delay_min=%d", 581 fsopt->caps_wanted_delay_min); 582 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 583 seq_printf(m, ",caps_wanted_delay_max=%d", 584 fsopt->caps_wanted_delay_max); 585 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 586 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 587 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 588 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 589 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 590 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 591 592 return 0; 593 } 594 595 /* 596 * handle any mon messages the standard library doesn't understand. 597 * return error if we don't either. 598 */ 599 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 600 { 601 struct ceph_fs_client *fsc = client->private; 602 int type = le16_to_cpu(msg->hdr.type); 603 604 switch (type) { 605 case CEPH_MSG_MDS_MAP: 606 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 607 return 0; 608 case CEPH_MSG_FS_MAP_USER: 609 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 610 return 0; 611 default: 612 return -1; 613 } 614 } 615 616 /* 617 * create a new fs client 618 * 619 * Success or not, this function consumes @fsopt and @opt. 620 */ 621 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 622 struct ceph_options *opt) 623 { 624 struct ceph_fs_client *fsc; 625 int page_count; 626 size_t size; 627 int err; 628 629 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 630 if (!fsc) { 631 err = -ENOMEM; 632 goto fail; 633 } 634 635 fsc->client = ceph_create_client(opt, fsc); 636 if (IS_ERR(fsc->client)) { 637 err = PTR_ERR(fsc->client); 638 goto fail; 639 } 640 opt = NULL; /* fsc->client now owns this */ 641 642 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 643 fsc->client->osdc.abort_on_full = true; 644 645 if (!fsopt->mds_namespace) { 646 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 647 0, true); 648 } else { 649 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 650 0, false); 651 } 652 653 fsc->mount_options = fsopt; 654 655 fsc->sb = NULL; 656 fsc->mount_state = CEPH_MOUNT_MOUNTING; 657 658 atomic_long_set(&fsc->writeback_count, 0); 659 660 err = -ENOMEM; 661 /* 662 * The number of concurrent works can be high but they don't need 663 * to be processed in parallel, limit concurrency. 664 */ 665 fsc->wb_wq = alloc_workqueue("ceph-writeback", 0, 1); 666 if (!fsc->wb_wq) 667 goto fail_client; 668 fsc->pg_inv_wq = alloc_workqueue("ceph-pg-invalid", 0, 1); 669 if (!fsc->pg_inv_wq) 670 goto fail_wb_wq; 671 fsc->trunc_wq = alloc_workqueue("ceph-trunc", 0, 1); 672 if (!fsc->trunc_wq) 673 goto fail_pg_inv_wq; 674 675 /* set up mempools */ 676 err = -ENOMEM; 677 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 678 size = sizeof (struct page *) * (page_count ? page_count : 1); 679 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 680 if (!fsc->wb_pagevec_pool) 681 goto fail_trunc_wq; 682 683 /* caps */ 684 fsc->min_caps = fsopt->max_readdir; 685 686 return fsc; 687 688 fail_trunc_wq: 689 destroy_workqueue(fsc->trunc_wq); 690 fail_pg_inv_wq: 691 destroy_workqueue(fsc->pg_inv_wq); 692 fail_wb_wq: 693 destroy_workqueue(fsc->wb_wq); 694 fail_client: 695 ceph_destroy_client(fsc->client); 696 fail: 697 kfree(fsc); 698 if (opt) 699 ceph_destroy_options(opt); 700 destroy_mount_options(fsopt); 701 return ERR_PTR(err); 702 } 703 704 static void flush_fs_workqueues(struct ceph_fs_client *fsc) 705 { 706 flush_workqueue(fsc->wb_wq); 707 flush_workqueue(fsc->pg_inv_wq); 708 flush_workqueue(fsc->trunc_wq); 709 } 710 711 static void destroy_fs_client(struct ceph_fs_client *fsc) 712 { 713 dout("destroy_fs_client %p\n", fsc); 714 715 destroy_workqueue(fsc->wb_wq); 716 destroy_workqueue(fsc->pg_inv_wq); 717 destroy_workqueue(fsc->trunc_wq); 718 719 mempool_destroy(fsc->wb_pagevec_pool); 720 721 destroy_mount_options(fsc->mount_options); 722 723 ceph_destroy_client(fsc->client); 724 725 kfree(fsc); 726 dout("destroy_fs_client %p done\n", fsc); 727 } 728 729 /* 730 * caches 731 */ 732 struct kmem_cache *ceph_inode_cachep; 733 struct kmem_cache *ceph_cap_cachep; 734 struct kmem_cache *ceph_cap_flush_cachep; 735 struct kmem_cache *ceph_dentry_cachep; 736 struct kmem_cache *ceph_file_cachep; 737 struct kmem_cache *ceph_dir_file_cachep; 738 739 static void ceph_inode_init_once(void *foo) 740 { 741 struct ceph_inode_info *ci = foo; 742 inode_init_once(&ci->vfs_inode); 743 } 744 745 static int __init init_caches(void) 746 { 747 int error = -ENOMEM; 748 749 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 750 sizeof(struct ceph_inode_info), 751 __alignof__(struct ceph_inode_info), 752 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 753 SLAB_ACCOUNT, ceph_inode_init_once); 754 if (!ceph_inode_cachep) 755 return -ENOMEM; 756 757 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD); 758 if (!ceph_cap_cachep) 759 goto bad_cap; 760 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 761 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 762 if (!ceph_cap_flush_cachep) 763 goto bad_cap_flush; 764 765 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 766 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 767 if (!ceph_dentry_cachep) 768 goto bad_dentry; 769 770 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 771 if (!ceph_file_cachep) 772 goto bad_file; 773 774 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD); 775 if (!ceph_dir_file_cachep) 776 goto bad_dir_file; 777 778 error = ceph_fscache_register(); 779 if (error) 780 goto bad_fscache; 781 782 return 0; 783 784 bad_fscache: 785 kmem_cache_destroy(ceph_dir_file_cachep); 786 bad_dir_file: 787 kmem_cache_destroy(ceph_file_cachep); 788 bad_file: 789 kmem_cache_destroy(ceph_dentry_cachep); 790 bad_dentry: 791 kmem_cache_destroy(ceph_cap_flush_cachep); 792 bad_cap_flush: 793 kmem_cache_destroy(ceph_cap_cachep); 794 bad_cap: 795 kmem_cache_destroy(ceph_inode_cachep); 796 return error; 797 } 798 799 static void destroy_caches(void) 800 { 801 /* 802 * Make sure all delayed rcu free inodes are flushed before we 803 * destroy cache. 804 */ 805 rcu_barrier(); 806 807 kmem_cache_destroy(ceph_inode_cachep); 808 kmem_cache_destroy(ceph_cap_cachep); 809 kmem_cache_destroy(ceph_cap_flush_cachep); 810 kmem_cache_destroy(ceph_dentry_cachep); 811 kmem_cache_destroy(ceph_file_cachep); 812 kmem_cache_destroy(ceph_dir_file_cachep); 813 814 ceph_fscache_unregister(); 815 } 816 817 818 /* 819 * ceph_umount_begin - initiate forced umount. Tear down down the 820 * mount, skipping steps that may hang while waiting for server(s). 821 */ 822 static void ceph_umount_begin(struct super_block *sb) 823 { 824 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 825 826 dout("ceph_umount_begin - starting forced umount\n"); 827 if (!fsc) 828 return; 829 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 830 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO); 831 ceph_mdsc_force_umount(fsc->mdsc); 832 return; 833 } 834 835 static const struct super_operations ceph_super_ops = { 836 .alloc_inode = ceph_alloc_inode, 837 .destroy_inode = ceph_destroy_inode, 838 .write_inode = ceph_write_inode, 839 .drop_inode = ceph_drop_inode, 840 .sync_fs = ceph_sync_fs, 841 .put_super = ceph_put_super, 842 .show_options = ceph_show_options, 843 .statfs = ceph_statfs, 844 .umount_begin = ceph_umount_begin, 845 }; 846 847 /* 848 * Bootstrap mount by opening the root directory. Note the mount 849 * @started time from caller, and time out if this takes too long. 850 */ 851 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 852 const char *path, 853 unsigned long started) 854 { 855 struct ceph_mds_client *mdsc = fsc->mdsc; 856 struct ceph_mds_request *req = NULL; 857 int err; 858 struct dentry *root; 859 860 /* open dir */ 861 dout("open_root_inode opening '%s'\n", path); 862 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 863 if (IS_ERR(req)) 864 return ERR_CAST(req); 865 req->r_path1 = kstrdup(path, GFP_NOFS); 866 if (!req->r_path1) { 867 root = ERR_PTR(-ENOMEM); 868 goto out; 869 } 870 871 req->r_ino1.ino = CEPH_INO_ROOT; 872 req->r_ino1.snap = CEPH_NOSNAP; 873 req->r_started = started; 874 req->r_timeout = fsc->client->options->mount_timeout; 875 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 876 req->r_num_caps = 2; 877 err = ceph_mdsc_do_request(mdsc, NULL, req); 878 if (err == 0) { 879 struct inode *inode = req->r_target_inode; 880 req->r_target_inode = NULL; 881 dout("open_root_inode success\n"); 882 root = d_make_root(inode); 883 if (!root) { 884 root = ERR_PTR(-ENOMEM); 885 goto out; 886 } 887 dout("open_root_inode success, root dentry is %p\n", root); 888 } else { 889 root = ERR_PTR(err); 890 } 891 out: 892 ceph_mdsc_put_request(req); 893 return root; 894 } 895 896 897 898 899 /* 900 * mount: join the ceph cluster, and open root directory. 901 */ 902 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 903 { 904 int err; 905 unsigned long started = jiffies; /* note the start time */ 906 struct dentry *root; 907 908 dout("mount start %p\n", fsc); 909 mutex_lock(&fsc->client->mount_mutex); 910 911 if (!fsc->sb->s_root) { 912 const char *path; 913 err = __ceph_open_session(fsc->client, started); 914 if (err < 0) 915 goto out; 916 917 /* setup fscache */ 918 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) { 919 err = ceph_fscache_register_fs(fsc); 920 if (err < 0) 921 goto out; 922 } 923 924 if (!fsc->mount_options->server_path) { 925 path = ""; 926 dout("mount opening path \\t\n"); 927 } else { 928 path = fsc->mount_options->server_path + 1; 929 dout("mount opening path %s\n", path); 930 } 931 932 err = ceph_fs_debugfs_init(fsc); 933 if (err < 0) 934 goto out; 935 936 root = open_root_dentry(fsc, path, started); 937 if (IS_ERR(root)) { 938 err = PTR_ERR(root); 939 goto out; 940 } 941 fsc->sb->s_root = dget(root); 942 } else { 943 root = dget(fsc->sb->s_root); 944 } 945 946 fsc->mount_state = CEPH_MOUNT_MOUNTED; 947 dout("mount success\n"); 948 mutex_unlock(&fsc->client->mount_mutex); 949 return root; 950 951 out: 952 mutex_unlock(&fsc->client->mount_mutex); 953 return ERR_PTR(err); 954 } 955 956 static int ceph_set_super(struct super_block *s, void *data) 957 { 958 struct ceph_fs_client *fsc = data; 959 int ret; 960 961 dout("set_super %p data %p\n", s, data); 962 963 s->s_flags = fsc->mount_options->sb_flags; 964 s->s_maxbytes = MAX_LFS_FILESIZE; 965 966 s->s_xattr = ceph_xattr_handlers; 967 s->s_fs_info = fsc; 968 fsc->sb = s; 969 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */ 970 971 s->s_op = &ceph_super_ops; 972 s->s_d_op = &ceph_dentry_ops; 973 s->s_export_op = &ceph_export_ops; 974 975 s->s_time_gran = 1000; /* 1000 ns == 1 us */ 976 977 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 978 if (ret != 0) 979 goto fail; 980 981 return ret; 982 983 fail: 984 s->s_fs_info = NULL; 985 fsc->sb = NULL; 986 return ret; 987 } 988 989 /* 990 * share superblock if same fs AND options 991 */ 992 static int ceph_compare_super(struct super_block *sb, void *data) 993 { 994 struct ceph_fs_client *new = data; 995 struct ceph_mount_options *fsopt = new->mount_options; 996 struct ceph_options *opt = new->client->options; 997 struct ceph_fs_client *other = ceph_sb_to_client(sb); 998 999 dout("ceph_compare_super %p\n", sb); 1000 1001 if (compare_mount_options(fsopt, opt, other)) { 1002 dout("monitor(s)/mount options don't match\n"); 1003 return 0; 1004 } 1005 if ((opt->flags & CEPH_OPT_FSID) && 1006 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 1007 dout("fsid doesn't match\n"); 1008 return 0; 1009 } 1010 if (fsopt->sb_flags != other->mount_options->sb_flags) { 1011 dout("flags differ\n"); 1012 return 0; 1013 } 1014 return 1; 1015 } 1016 1017 /* 1018 * construct our own bdi so we can control readahead, etc. 1019 */ 1020 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 1021 1022 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc) 1023 { 1024 int err; 1025 1026 err = super_setup_bdi_name(sb, "ceph-%ld", 1027 atomic_long_inc_return(&bdi_seq)); 1028 if (err) 1029 return err; 1030 1031 /* set ra_pages based on rasize mount option? */ 1032 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT; 1033 1034 /* set io_pages based on max osd read size */ 1035 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT; 1036 1037 return 0; 1038 } 1039 1040 static struct dentry *ceph_mount(struct file_system_type *fs_type, 1041 int flags, const char *dev_name, void *data) 1042 { 1043 struct super_block *sb; 1044 struct ceph_fs_client *fsc; 1045 struct dentry *res; 1046 int err; 1047 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 1048 struct ceph_mount_options *fsopt = NULL; 1049 struct ceph_options *opt = NULL; 1050 1051 dout("ceph_mount\n"); 1052 1053 #ifdef CONFIG_CEPH_FS_POSIX_ACL 1054 flags |= SB_POSIXACL; 1055 #endif 1056 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 1057 if (err < 0) { 1058 res = ERR_PTR(err); 1059 goto out_final; 1060 } 1061 1062 /* create client (which we may/may not use) */ 1063 fsc = create_fs_client(fsopt, opt); 1064 if (IS_ERR(fsc)) { 1065 res = ERR_CAST(fsc); 1066 goto out_final; 1067 } 1068 1069 err = ceph_mdsc_init(fsc); 1070 if (err < 0) { 1071 res = ERR_PTR(err); 1072 goto out; 1073 } 1074 1075 if (ceph_test_opt(fsc->client, NOSHARE)) 1076 compare_super = NULL; 1077 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1078 if (IS_ERR(sb)) { 1079 res = ERR_CAST(sb); 1080 goto out; 1081 } 1082 1083 if (ceph_sb_to_client(sb) != fsc) { 1084 ceph_mdsc_destroy(fsc); 1085 destroy_fs_client(fsc); 1086 fsc = ceph_sb_to_client(sb); 1087 dout("get_sb got existing client %p\n", fsc); 1088 } else { 1089 dout("get_sb using new client %p\n", fsc); 1090 err = ceph_setup_bdi(sb, fsc); 1091 if (err < 0) { 1092 res = ERR_PTR(err); 1093 goto out_splat; 1094 } 1095 } 1096 1097 res = ceph_real_mount(fsc); 1098 if (IS_ERR(res)) 1099 goto out_splat; 1100 dout("root %p inode %p ino %llx.%llx\n", res, 1101 d_inode(res), ceph_vinop(d_inode(res))); 1102 return res; 1103 1104 out_splat: 1105 ceph_mdsc_close_sessions(fsc->mdsc); 1106 deactivate_locked_super(sb); 1107 goto out_final; 1108 1109 out: 1110 ceph_mdsc_destroy(fsc); 1111 destroy_fs_client(fsc); 1112 out_final: 1113 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1114 return res; 1115 } 1116 1117 static void ceph_kill_sb(struct super_block *s) 1118 { 1119 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1120 dev_t dev = s->s_dev; 1121 1122 dout("kill_sb %p\n", s); 1123 1124 ceph_mdsc_pre_umount(fsc->mdsc); 1125 flush_fs_workqueues(fsc); 1126 1127 generic_shutdown_super(s); 1128 1129 fsc->client->extra_mon_dispatch = NULL; 1130 ceph_fs_debugfs_cleanup(fsc); 1131 1132 ceph_fscache_unregister_fs(fsc); 1133 1134 ceph_mdsc_destroy(fsc); 1135 1136 destroy_fs_client(fsc); 1137 free_anon_bdev(dev); 1138 } 1139 1140 static struct file_system_type ceph_fs_type = { 1141 .owner = THIS_MODULE, 1142 .name = "ceph", 1143 .mount = ceph_mount, 1144 .kill_sb = ceph_kill_sb, 1145 .fs_flags = FS_RENAME_DOES_D_MOVE, 1146 }; 1147 MODULE_ALIAS_FS("ceph"); 1148 1149 static int __init init_ceph(void) 1150 { 1151 int ret = init_caches(); 1152 if (ret) 1153 goto out; 1154 1155 ceph_flock_init(); 1156 ceph_xattr_init(); 1157 ret = register_filesystem(&ceph_fs_type); 1158 if (ret) 1159 goto out_xattr; 1160 1161 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1162 1163 return 0; 1164 1165 out_xattr: 1166 ceph_xattr_exit(); 1167 destroy_caches(); 1168 out: 1169 return ret; 1170 } 1171 1172 static void __exit exit_ceph(void) 1173 { 1174 dout("exit_ceph\n"); 1175 unregister_filesystem(&ceph_fs_type); 1176 ceph_xattr_exit(); 1177 destroy_caches(); 1178 } 1179 1180 module_init(init_ceph); 1181 module_exit(exit_ceph); 1182 1183 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1184 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1185 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1186 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1187 MODULE_LICENSE("GPL"); 1188