1 /* 2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. 4 * 5 * This copyrighted material is made available to anyone wishing to use, 6 * modify, copy, or redistribute it subject to the terms and conditions 7 * of the GNU General Public License version 2. 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/sched.h> 13 #include <linux/slab.h> 14 #include <linux/spinlock.h> 15 #include <linux/completion.h> 16 #include <linux/buffer_head.h> 17 #include <linux/blkdev.h> 18 #include <linux/kthread.h> 19 #include <linux/export.h> 20 #include <linux/namei.h> 21 #include <linux/mount.h> 22 #include <linux/gfs2_ondisk.h> 23 #include <linux/quotaops.h> 24 #include <linux/lockdep.h> 25 #include <linux/module.h> 26 #include <linux/backing-dev.h> 27 28 #include "gfs2.h" 29 #include "incore.h" 30 #include "bmap.h" 31 #include "glock.h" 32 #include "glops.h" 33 #include "inode.h" 34 #include "recovery.h" 35 #include "rgrp.h" 36 #include "super.h" 37 #include "sys.h" 38 #include "util.h" 39 #include "log.h" 40 #include "quota.h" 41 #include "dir.h" 42 #include "meta_io.h" 43 #include "trace_gfs2.h" 44 45 #define DO 0 46 #define UNDO 1 47 48 /** 49 * gfs2_tune_init - Fill a gfs2_tune structure with default values 50 * @gt: tune 51 * 52 */ 53 54 static void gfs2_tune_init(struct gfs2_tune *gt) 55 { 56 spin_lock_init(>->gt_spin); 57 58 gt->gt_quota_warn_period = 10; 59 gt->gt_quota_scale_num = 1; 60 gt->gt_quota_scale_den = 1; 61 gt->gt_new_files_jdata = 0; 62 gt->gt_max_readahead = BIT(18); 63 gt->gt_complain_secs = 10; 64 } 65 66 static struct gfs2_sbd *init_sbd(struct super_block *sb) 67 { 68 struct gfs2_sbd *sdp; 69 struct address_space *mapping; 70 71 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 72 if (!sdp) 73 return NULL; 74 75 sdp->sd_vfs = sb; 76 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 77 if (!sdp->sd_lkstats) { 78 kfree(sdp); 79 return NULL; 80 } 81 sb->s_fs_info = sdp; 82 83 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 84 gfs2_tune_init(&sdp->sd_tune); 85 86 init_waitqueue_head(&sdp->sd_glock_wait); 87 atomic_set(&sdp->sd_glock_disposal, 0); 88 init_completion(&sdp->sd_locking_init); 89 init_completion(&sdp->sd_wdack); 90 spin_lock_init(&sdp->sd_statfs_spin); 91 92 spin_lock_init(&sdp->sd_rindex_spin); 93 sdp->sd_rindex_tree.rb_node = NULL; 94 95 INIT_LIST_HEAD(&sdp->sd_jindex_list); 96 spin_lock_init(&sdp->sd_jindex_spin); 97 mutex_init(&sdp->sd_jindex_mutex); 98 init_completion(&sdp->sd_journal_ready); 99 100 INIT_LIST_HEAD(&sdp->sd_quota_list); 101 mutex_init(&sdp->sd_quota_mutex); 102 mutex_init(&sdp->sd_quota_sync_mutex); 103 init_waitqueue_head(&sdp->sd_quota_wait); 104 INIT_LIST_HEAD(&sdp->sd_trunc_list); 105 spin_lock_init(&sdp->sd_trunc_lock); 106 spin_lock_init(&sdp->sd_bitmap_lock); 107 108 mapping = &sdp->sd_aspace; 109 110 address_space_init_once(mapping); 111 mapping->a_ops = &gfs2_rgrp_aops; 112 mapping->host = sb->s_bdev->bd_inode; 113 mapping->flags = 0; 114 mapping_set_gfp_mask(mapping, GFP_NOFS); 115 mapping->private_data = NULL; 116 mapping->writeback_index = 0; 117 118 spin_lock_init(&sdp->sd_log_lock); 119 atomic_set(&sdp->sd_log_pinned, 0); 120 INIT_LIST_HEAD(&sdp->sd_log_le_revoke); 121 INIT_LIST_HEAD(&sdp->sd_log_le_ordered); 122 spin_lock_init(&sdp->sd_ordered_lock); 123 124 init_waitqueue_head(&sdp->sd_log_waitq); 125 init_waitqueue_head(&sdp->sd_logd_waitq); 126 spin_lock_init(&sdp->sd_ail_lock); 127 INIT_LIST_HEAD(&sdp->sd_ail1_list); 128 INIT_LIST_HEAD(&sdp->sd_ail2_list); 129 130 init_rwsem(&sdp->sd_log_flush_lock); 131 atomic_set(&sdp->sd_log_in_flight, 0); 132 atomic_set(&sdp->sd_reserving_log, 0); 133 init_waitqueue_head(&sdp->sd_reserving_log_wait); 134 init_waitqueue_head(&sdp->sd_log_flush_wait); 135 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 136 mutex_init(&sdp->sd_freeze_mutex); 137 138 return sdp; 139 } 140 141 142 /** 143 * gfs2_check_sb - Check superblock 144 * @sdp: the filesystem 145 * @sb: The superblock 146 * @silent: Don't print a message if the check fails 147 * 148 * Checks the version code of the FS is one that we understand how to 149 * read and that the sizes of the various on-disk structures have not 150 * changed. 151 */ 152 153 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 154 { 155 struct gfs2_sb_host *sb = &sdp->sd_sb; 156 157 if (sb->sb_magic != GFS2_MAGIC || 158 sb->sb_type != GFS2_METATYPE_SB) { 159 if (!silent) 160 pr_warn("not a GFS2 filesystem\n"); 161 return -EINVAL; 162 } 163 164 /* If format numbers match exactly, we're done. */ 165 166 if (sb->sb_fs_format == GFS2_FORMAT_FS && 167 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 168 return 0; 169 170 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 171 172 return -EINVAL; 173 } 174 175 static void end_bio_io_page(struct bio *bio) 176 { 177 struct page *page = bio->bi_private; 178 179 if (!bio->bi_status) 180 SetPageUptodate(page); 181 else 182 pr_warn("error %d reading superblock\n", bio->bi_status); 183 unlock_page(page); 184 } 185 186 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 187 { 188 struct gfs2_sb_host *sb = &sdp->sd_sb; 189 struct super_block *s = sdp->sd_vfs; 190 const struct gfs2_sb *str = buf; 191 192 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 193 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 194 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 195 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 196 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 197 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 198 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 199 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 200 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 201 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 202 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 203 204 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 205 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 206 memcpy(&s->s_uuid, str->sb_uuid, 16); 207 } 208 209 /** 210 * gfs2_read_super - Read the gfs2 super block from disk 211 * @sdp: The GFS2 super block 212 * @sector: The location of the super block 213 * @error: The error code to return 214 * 215 * This uses the bio functions to read the super block from disk 216 * because we want to be 100% sure that we never read cached data. 217 * A super block is read twice only during each GFS2 mount and is 218 * never written to by the filesystem. The first time its read no 219 * locks are held, and the only details which are looked at are those 220 * relating to the locking protocol. Once locking is up and working, 221 * the sb is read again under the lock to establish the location of 222 * the master directory (contains pointers to journals etc) and the 223 * root directory. 224 * 225 * Returns: 0 on success or error 226 */ 227 228 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 229 { 230 struct super_block *sb = sdp->sd_vfs; 231 struct gfs2_sb *p; 232 struct page *page; 233 struct bio *bio; 234 235 page = alloc_page(GFP_NOFS); 236 if (unlikely(!page)) 237 return -ENOMEM; 238 239 ClearPageUptodate(page); 240 ClearPageDirty(page); 241 lock_page(page); 242 243 bio = bio_alloc(GFP_NOFS, 1); 244 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 245 bio_set_dev(bio, sb->s_bdev); 246 bio_add_page(bio, page, PAGE_SIZE, 0); 247 248 bio->bi_end_io = end_bio_io_page; 249 bio->bi_private = page; 250 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META); 251 submit_bio(bio); 252 wait_on_page_locked(page); 253 bio_put(bio); 254 if (!PageUptodate(page)) { 255 __free_page(page); 256 return -EIO; 257 } 258 p = kmap(page); 259 gfs2_sb_in(sdp, p); 260 kunmap(page); 261 __free_page(page); 262 return gfs2_check_sb(sdp, silent); 263 } 264 265 /** 266 * gfs2_read_sb - Read super block 267 * @sdp: The GFS2 superblock 268 * @silent: Don't print message if mount fails 269 * 270 */ 271 272 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 273 { 274 u32 hash_blocks, ind_blocks, leaf_blocks; 275 u32 tmp_blocks; 276 unsigned int x; 277 int error; 278 279 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 280 if (error) { 281 if (!silent) 282 fs_err(sdp, "can't read superblock\n"); 283 return error; 284 } 285 286 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 287 GFS2_BASIC_BLOCK_SHIFT; 288 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 289 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 290 sizeof(struct gfs2_dinode)) / sizeof(u64); 291 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 292 sizeof(struct gfs2_meta_header)) / sizeof(u64); 293 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 294 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 295 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 296 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 297 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 298 sizeof(struct gfs2_meta_header)) / 299 sizeof(struct gfs2_quota_change); 300 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 301 sizeof(struct gfs2_meta_header)) 302 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 303 304 /* Compute maximum reservation required to add a entry to a directory */ 305 306 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 307 sdp->sd_jbsize); 308 309 ind_blocks = 0; 310 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 311 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 312 ind_blocks += tmp_blocks; 313 } 314 315 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 316 317 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 318 319 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 320 sizeof(struct gfs2_dinode); 321 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 322 for (x = 2;; x++) { 323 u64 space, d; 324 u32 m; 325 326 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 327 d = space; 328 m = do_div(d, sdp->sd_inptrs); 329 330 if (d != sdp->sd_heightsize[x - 1] || m) 331 break; 332 sdp->sd_heightsize[x] = space; 333 } 334 sdp->sd_max_height = x; 335 sdp->sd_heightsize[x] = ~0; 336 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 337 338 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 339 sizeof(struct gfs2_leaf)) / 340 GFS2_MIN_DIRENT_SIZE; 341 return 0; 342 } 343 344 static int init_names(struct gfs2_sbd *sdp, int silent) 345 { 346 char *proto, *table; 347 int error = 0; 348 349 proto = sdp->sd_args.ar_lockproto; 350 table = sdp->sd_args.ar_locktable; 351 352 /* Try to autodetect */ 353 354 if (!proto[0] || !table[0]) { 355 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 356 if (error) 357 return error; 358 359 if (!proto[0]) 360 proto = sdp->sd_sb.sb_lockproto; 361 if (!table[0]) 362 table = sdp->sd_sb.sb_locktable; 363 } 364 365 if (!table[0]) 366 table = sdp->sd_vfs->s_id; 367 368 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 369 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 370 371 table = sdp->sd_table_name; 372 while ((table = strchr(table, '/'))) 373 *table = '_'; 374 375 return error; 376 } 377 378 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 379 int undo) 380 { 381 int error = 0; 382 383 if (undo) 384 goto fail_trans; 385 386 error = gfs2_glock_nq_num(sdp, 387 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 388 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 389 mount_gh); 390 if (error) { 391 fs_err(sdp, "can't acquire mount glock: %d\n", error); 392 goto fail; 393 } 394 395 error = gfs2_glock_nq_num(sdp, 396 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 397 LM_ST_SHARED, 398 LM_FLAG_NOEXP | GL_EXACT, 399 &sdp->sd_live_gh); 400 if (error) { 401 fs_err(sdp, "can't acquire live glock: %d\n", error); 402 goto fail_mount; 403 } 404 405 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 406 CREATE, &sdp->sd_rename_gl); 407 if (error) { 408 fs_err(sdp, "can't create rename glock: %d\n", error); 409 goto fail_live; 410 } 411 412 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 413 CREATE, &sdp->sd_freeze_gl); 414 if (error) { 415 fs_err(sdp, "can't create transaction glock: %d\n", error); 416 goto fail_rename; 417 } 418 419 return 0; 420 421 fail_trans: 422 gfs2_glock_put(sdp->sd_freeze_gl); 423 fail_rename: 424 gfs2_glock_put(sdp->sd_rename_gl); 425 fail_live: 426 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 427 fail_mount: 428 gfs2_glock_dq_uninit(mount_gh); 429 fail: 430 return error; 431 } 432 433 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 434 u64 no_addr, const char *name) 435 { 436 struct gfs2_sbd *sdp = sb->s_fs_info; 437 struct dentry *dentry; 438 struct inode *inode; 439 440 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 441 GFS2_BLKST_FREE /* ignore */); 442 if (IS_ERR(inode)) { 443 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 444 return PTR_ERR(inode); 445 } 446 dentry = d_make_root(inode); 447 if (!dentry) { 448 fs_err(sdp, "can't alloc %s dentry\n", name); 449 return -ENOMEM; 450 } 451 *dptr = dentry; 452 return 0; 453 } 454 455 static int init_sb(struct gfs2_sbd *sdp, int silent) 456 { 457 struct super_block *sb = sdp->sd_vfs; 458 struct gfs2_holder sb_gh; 459 u64 no_addr; 460 int ret; 461 462 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 463 LM_ST_SHARED, 0, &sb_gh); 464 if (ret) { 465 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 466 return ret; 467 } 468 469 ret = gfs2_read_sb(sdp, silent); 470 if (ret) { 471 fs_err(sdp, "can't read superblock: %d\n", ret); 472 goto out; 473 } 474 475 /* Set up the buffer cache and SB for real */ 476 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 477 ret = -EINVAL; 478 fs_err(sdp, "FS block size (%u) is too small for device " 479 "block size (%u)\n", 480 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 481 goto out; 482 } 483 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 484 ret = -EINVAL; 485 fs_err(sdp, "FS block size (%u) is too big for machine " 486 "page size (%u)\n", 487 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 488 goto out; 489 } 490 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 491 492 /* Get the root inode */ 493 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 494 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 495 if (ret) 496 goto out; 497 498 /* Get the master inode */ 499 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 500 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 501 if (ret) { 502 dput(sdp->sd_root_dir); 503 goto out; 504 } 505 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 506 out: 507 gfs2_glock_dq_uninit(&sb_gh); 508 return ret; 509 } 510 511 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 512 { 513 char *message = "FIRSTMOUNT=Done"; 514 char *envp[] = { message, NULL }; 515 516 fs_info(sdp, "first mount done, others may mount\n"); 517 518 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 519 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 520 521 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 522 } 523 524 /** 525 * gfs2_jindex_hold - Grab a lock on the jindex 526 * @sdp: The GFS2 superblock 527 * @ji_gh: the holder for the jindex glock 528 * 529 * Returns: errno 530 */ 531 532 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 533 { 534 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 535 struct qstr name; 536 char buf[20]; 537 struct gfs2_jdesc *jd; 538 int error; 539 540 name.name = buf; 541 542 mutex_lock(&sdp->sd_jindex_mutex); 543 544 for (;;) { 545 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 546 if (error) 547 break; 548 549 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 550 name.hash = gfs2_disk_hash(name.name, name.len); 551 552 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 553 if (error == -ENOENT) { 554 error = 0; 555 break; 556 } 557 558 gfs2_glock_dq_uninit(ji_gh); 559 560 if (error) 561 break; 562 563 error = -ENOMEM; 564 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 565 if (!jd) 566 break; 567 568 INIT_LIST_HEAD(&jd->extent_list); 569 INIT_LIST_HEAD(&jd->jd_revoke_list); 570 571 INIT_WORK(&jd->jd_work, gfs2_recover_func); 572 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 573 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 574 if (!jd->jd_inode) 575 error = -ENOENT; 576 else 577 error = PTR_ERR(jd->jd_inode); 578 kfree(jd); 579 break; 580 } 581 582 spin_lock(&sdp->sd_jindex_spin); 583 jd->jd_jid = sdp->sd_journals++; 584 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 585 spin_unlock(&sdp->sd_jindex_spin); 586 } 587 588 mutex_unlock(&sdp->sd_jindex_mutex); 589 590 return error; 591 } 592 593 /** 594 * check_journal_clean - Make sure a journal is clean for a spectator mount 595 * @sdp: The GFS2 superblock 596 * @jd: The journal descriptor 597 * 598 * Returns: 0 if the journal is clean or locked, else an error 599 */ 600 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 601 { 602 int error; 603 struct gfs2_holder j_gh; 604 struct gfs2_log_header_host head; 605 struct gfs2_inode *ip; 606 607 ip = GFS2_I(jd->jd_inode); 608 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 609 GL_EXACT | GL_NOCACHE, &j_gh); 610 if (error) { 611 fs_err(sdp, "Error locking journal for spectator mount.\n"); 612 return -EPERM; 613 } 614 error = gfs2_jdesc_check(jd); 615 if (error) { 616 fs_err(sdp, "Error checking journal for spectator mount.\n"); 617 goto out_unlock; 618 } 619 error = gfs2_find_jhead(jd, &head); 620 if (error) { 621 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 622 goto out_unlock; 623 } 624 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 625 error = -EPERM; 626 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 627 "must not be a spectator.\n", jd->jd_jid); 628 } 629 630 out_unlock: 631 gfs2_glock_dq_uninit(&j_gh); 632 return error; 633 } 634 635 static int init_journal(struct gfs2_sbd *sdp, int undo) 636 { 637 struct inode *master = d_inode(sdp->sd_master_dir); 638 struct gfs2_holder ji_gh; 639 struct gfs2_inode *ip; 640 int jindex = 1; 641 int error = 0; 642 643 if (undo) { 644 jindex = 0; 645 goto fail_jinode_gh; 646 } 647 648 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 649 if (IS_ERR(sdp->sd_jindex)) { 650 fs_err(sdp, "can't lookup journal index: %d\n", error); 651 return PTR_ERR(sdp->sd_jindex); 652 } 653 654 /* Load in the journal index special file */ 655 656 error = gfs2_jindex_hold(sdp, &ji_gh); 657 if (error) { 658 fs_err(sdp, "can't read journal index: %d\n", error); 659 goto fail; 660 } 661 662 error = -EUSERS; 663 if (!gfs2_jindex_size(sdp)) { 664 fs_err(sdp, "no journals!\n"); 665 goto fail_jindex; 666 } 667 668 atomic_set(&sdp->sd_log_blks_needed, 0); 669 if (sdp->sd_args.ar_spectator) { 670 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 671 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 672 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 673 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 674 } else { 675 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 676 fs_err(sdp, "can't mount journal #%u\n", 677 sdp->sd_lockstruct.ls_jid); 678 fs_err(sdp, "there are only %u journals (0 - %u)\n", 679 gfs2_jindex_size(sdp), 680 gfs2_jindex_size(sdp) - 1); 681 goto fail_jindex; 682 } 683 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 684 685 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 686 &gfs2_journal_glops, 687 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 688 &sdp->sd_journal_gh); 689 if (error) { 690 fs_err(sdp, "can't acquire journal glock: %d\n", error); 691 goto fail_jindex; 692 } 693 694 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 695 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 696 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 697 &sdp->sd_jinode_gh); 698 if (error) { 699 fs_err(sdp, "can't acquire journal inode glock: %d\n", 700 error); 701 goto fail_journal_gh; 702 } 703 704 error = gfs2_jdesc_check(sdp->sd_jdesc); 705 if (error) { 706 fs_err(sdp, "my journal (%u) is bad: %d\n", 707 sdp->sd_jdesc->jd_jid, error); 708 goto fail_jinode_gh; 709 } 710 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 711 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 712 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 713 714 /* Map the extents for this journal's blocks */ 715 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 716 } 717 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 718 719 if (sdp->sd_lockstruct.ls_first) { 720 unsigned int x; 721 for (x = 0; x < sdp->sd_journals; x++) { 722 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 723 724 if (sdp->sd_args.ar_spectator) { 725 error = check_journal_clean(sdp, jd); 726 if (error) 727 goto fail_jinode_gh; 728 continue; 729 } 730 error = gfs2_recover_journal(jd, true); 731 if (error) { 732 fs_err(sdp, "error recovering journal %u: %d\n", 733 x, error); 734 goto fail_jinode_gh; 735 } 736 } 737 738 gfs2_others_may_mount(sdp); 739 } else if (!sdp->sd_args.ar_spectator) { 740 error = gfs2_recover_journal(sdp->sd_jdesc, true); 741 if (error) { 742 fs_err(sdp, "error recovering my journal: %d\n", error); 743 goto fail_jinode_gh; 744 } 745 } 746 747 sdp->sd_log_idle = 1; 748 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 749 gfs2_glock_dq_uninit(&ji_gh); 750 jindex = 0; 751 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 752 return 0; 753 754 fail_jinode_gh: 755 if (!sdp->sd_args.ar_spectator) 756 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 757 fail_journal_gh: 758 if (!sdp->sd_args.ar_spectator) 759 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 760 fail_jindex: 761 gfs2_jindex_free(sdp); 762 if (jindex) 763 gfs2_glock_dq_uninit(&ji_gh); 764 fail: 765 iput(sdp->sd_jindex); 766 return error; 767 } 768 769 static struct lock_class_key gfs2_quota_imutex_key; 770 771 static int init_inodes(struct gfs2_sbd *sdp, int undo) 772 { 773 int error = 0; 774 struct inode *master = d_inode(sdp->sd_master_dir); 775 776 if (undo) 777 goto fail_qinode; 778 779 error = init_journal(sdp, undo); 780 complete_all(&sdp->sd_journal_ready); 781 if (error) 782 goto fail; 783 784 /* Read in the master statfs inode */ 785 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 786 if (IS_ERR(sdp->sd_statfs_inode)) { 787 error = PTR_ERR(sdp->sd_statfs_inode); 788 fs_err(sdp, "can't read in statfs inode: %d\n", error); 789 goto fail_journal; 790 } 791 792 /* Read in the resource index inode */ 793 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 794 if (IS_ERR(sdp->sd_rindex)) { 795 error = PTR_ERR(sdp->sd_rindex); 796 fs_err(sdp, "can't get resource index inode: %d\n", error); 797 goto fail_statfs; 798 } 799 sdp->sd_rindex_uptodate = 0; 800 801 /* Read in the quota inode */ 802 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 803 if (IS_ERR(sdp->sd_quota_inode)) { 804 error = PTR_ERR(sdp->sd_quota_inode); 805 fs_err(sdp, "can't get quota file inode: %d\n", error); 806 goto fail_rindex; 807 } 808 /* 809 * i_rwsem on quota files is special. Since this inode is hidden system 810 * file, we are safe to define locking ourselves. 811 */ 812 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 813 &gfs2_quota_imutex_key); 814 815 error = gfs2_rindex_update(sdp); 816 if (error) 817 goto fail_qinode; 818 819 return 0; 820 821 fail_qinode: 822 iput(sdp->sd_quota_inode); 823 fail_rindex: 824 gfs2_clear_rgrpd(sdp); 825 iput(sdp->sd_rindex); 826 fail_statfs: 827 iput(sdp->sd_statfs_inode); 828 fail_journal: 829 init_journal(sdp, UNDO); 830 fail: 831 return error; 832 } 833 834 static int init_per_node(struct gfs2_sbd *sdp, int undo) 835 { 836 struct inode *pn = NULL; 837 char buf[30]; 838 int error = 0; 839 struct gfs2_inode *ip; 840 struct inode *master = d_inode(sdp->sd_master_dir); 841 842 if (sdp->sd_args.ar_spectator) 843 return 0; 844 845 if (undo) 846 goto fail_qc_gh; 847 848 pn = gfs2_lookup_simple(master, "per_node"); 849 if (IS_ERR(pn)) { 850 error = PTR_ERR(pn); 851 fs_err(sdp, "can't find per_node directory: %d\n", error); 852 return error; 853 } 854 855 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 856 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 857 if (IS_ERR(sdp->sd_sc_inode)) { 858 error = PTR_ERR(sdp->sd_sc_inode); 859 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 860 goto fail; 861 } 862 863 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 864 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 865 if (IS_ERR(sdp->sd_qc_inode)) { 866 error = PTR_ERR(sdp->sd_qc_inode); 867 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 868 goto fail_ut_i; 869 } 870 871 iput(pn); 872 pn = NULL; 873 874 ip = GFS2_I(sdp->sd_sc_inode); 875 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 876 &sdp->sd_sc_gh); 877 if (error) { 878 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 879 goto fail_qc_i; 880 } 881 882 ip = GFS2_I(sdp->sd_qc_inode); 883 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 884 &sdp->sd_qc_gh); 885 if (error) { 886 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 887 goto fail_ut_gh; 888 } 889 890 return 0; 891 892 fail_qc_gh: 893 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 894 fail_ut_gh: 895 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 896 fail_qc_i: 897 iput(sdp->sd_qc_inode); 898 fail_ut_i: 899 iput(sdp->sd_sc_inode); 900 fail: 901 iput(pn); 902 return error; 903 } 904 905 static const match_table_t nolock_tokens = { 906 { Opt_jid, "jid=%d\n", }, 907 { Opt_err, NULL }, 908 }; 909 910 static const struct lm_lockops nolock_ops = { 911 .lm_proto_name = "lock_nolock", 912 .lm_put_lock = gfs2_glock_free, 913 .lm_tokens = &nolock_tokens, 914 }; 915 916 /** 917 * gfs2_lm_mount - mount a locking protocol 918 * @sdp: the filesystem 919 * @args: mount arguments 920 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 921 * 922 * Returns: errno 923 */ 924 925 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 926 { 927 const struct lm_lockops *lm; 928 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 929 struct gfs2_args *args = &sdp->sd_args; 930 const char *proto = sdp->sd_proto_name; 931 const char *table = sdp->sd_table_name; 932 char *o, *options; 933 int ret; 934 935 if (!strcmp("lock_nolock", proto)) { 936 lm = &nolock_ops; 937 sdp->sd_args.ar_localflocks = 1; 938 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 939 } else if (!strcmp("lock_dlm", proto)) { 940 lm = &gfs2_dlm_ops; 941 #endif 942 } else { 943 pr_info("can't find protocol %s\n", proto); 944 return -ENOENT; 945 } 946 947 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 948 949 ls->ls_ops = lm; 950 ls->ls_first = 1; 951 952 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 953 substring_t tmp[MAX_OPT_ARGS]; 954 int token, option; 955 956 if (!o || !*o) 957 continue; 958 959 token = match_token(o, *lm->lm_tokens, tmp); 960 switch (token) { 961 case Opt_jid: 962 ret = match_int(&tmp[0], &option); 963 if (ret || option < 0) 964 goto hostdata_error; 965 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 966 ls->ls_jid = option; 967 break; 968 case Opt_id: 969 case Opt_nodir: 970 /* Obsolete, but left for backward compat purposes */ 971 break; 972 case Opt_first: 973 ret = match_int(&tmp[0], &option); 974 if (ret || (option != 0 && option != 1)) 975 goto hostdata_error; 976 ls->ls_first = option; 977 break; 978 case Opt_err: 979 default: 980 hostdata_error: 981 fs_info(sdp, "unknown hostdata (%s)\n", o); 982 return -EINVAL; 983 } 984 } 985 986 if (lm->lm_mount == NULL) { 987 fs_info(sdp, "Now mounting FS...\n"); 988 complete_all(&sdp->sd_locking_init); 989 return 0; 990 } 991 ret = lm->lm_mount(sdp, table); 992 if (ret == 0) 993 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 994 complete_all(&sdp->sd_locking_init); 995 return ret; 996 } 997 998 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 999 { 1000 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1001 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1002 lm->lm_unmount) 1003 lm->lm_unmount(sdp); 1004 } 1005 1006 static int wait_on_journal(struct gfs2_sbd *sdp) 1007 { 1008 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1009 return 0; 1010 1011 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1012 ? -EINTR : 0; 1013 } 1014 1015 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1016 { 1017 struct super_block *sb = sdp->sd_vfs; 1018 char ro[20]; 1019 char spectator[20]; 1020 char *envp[] = { ro, spectator, NULL }; 1021 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1022 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1023 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1024 } 1025 1026 /** 1027 * fill_super - Read in superblock 1028 * @sb: The VFS superblock 1029 * @data: Mount options 1030 * @silent: Don't complain if it's not a GFS2 filesystem 1031 * 1032 * Returns: errno 1033 */ 1034 1035 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1036 { 1037 struct gfs2_sbd *sdp; 1038 struct gfs2_holder mount_gh; 1039 int error; 1040 1041 sdp = init_sbd(sb); 1042 if (!sdp) { 1043 pr_warn("can't alloc struct gfs2_sbd\n"); 1044 return -ENOMEM; 1045 } 1046 sdp->sd_args = *args; 1047 1048 if (sdp->sd_args.ar_spectator) { 1049 sb->s_flags |= SB_RDONLY; 1050 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1051 } 1052 if (sdp->sd_args.ar_posix_acl) 1053 sb->s_flags |= SB_POSIXACL; 1054 if (sdp->sd_args.ar_nobarrier) 1055 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1056 1057 sb->s_flags |= SB_NOSEC; 1058 sb->s_magic = GFS2_MAGIC; 1059 sb->s_op = &gfs2_super_ops; 1060 sb->s_d_op = &gfs2_dops; 1061 sb->s_export_op = &gfs2_export_ops; 1062 sb->s_xattr = gfs2_xattr_handlers; 1063 sb->s_qcop = &gfs2_quotactl_ops; 1064 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1065 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1066 sb->s_time_gran = 1; 1067 sb->s_maxbytes = MAX_LFS_FILESIZE; 1068 1069 /* Set up the buffer cache and fill in some fake block size values 1070 to allow us to read-in the on-disk superblock. */ 1071 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1072 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1073 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1074 GFS2_BASIC_BLOCK_SHIFT; 1075 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1076 1077 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1078 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1079 if (sdp->sd_args.ar_statfs_quantum) { 1080 sdp->sd_tune.gt_statfs_slow = 0; 1081 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1082 } else { 1083 sdp->sd_tune.gt_statfs_slow = 1; 1084 sdp->sd_tune.gt_statfs_quantum = 30; 1085 } 1086 1087 error = init_names(sdp, silent); 1088 if (error) { 1089 /* In this case, we haven't initialized sysfs, so we have to 1090 manually free the sdp. */ 1091 free_percpu(sdp->sd_lkstats); 1092 kfree(sdp); 1093 sb->s_fs_info = NULL; 1094 return error; 1095 } 1096 1097 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1098 1099 error = gfs2_sys_fs_add(sdp); 1100 /* 1101 * If we hit an error here, gfs2_sys_fs_add will have called function 1102 * kobject_put which causes the sysfs usage count to go to zero, which 1103 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1104 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1105 * kobject_put to free sdp. 1106 */ 1107 if (error) 1108 return error; 1109 1110 gfs2_create_debugfs_file(sdp); 1111 1112 error = gfs2_lm_mount(sdp, silent); 1113 if (error) 1114 goto fail_debug; 1115 1116 error = init_locking(sdp, &mount_gh, DO); 1117 if (error) 1118 goto fail_lm; 1119 1120 error = init_sb(sdp, silent); 1121 if (error) 1122 goto fail_locking; 1123 1124 error = wait_on_journal(sdp); 1125 if (error) 1126 goto fail_sb; 1127 1128 /* 1129 * If user space has failed to join the cluster or some similar 1130 * failure has occurred, then the journal id will contain a 1131 * negative (error) number. This will then be returned to the 1132 * caller (of the mount syscall). We do this even for spectator 1133 * mounts (which just write a jid of 0 to indicate "ok" even though 1134 * the jid is unused in the spectator case) 1135 */ 1136 if (sdp->sd_lockstruct.ls_jid < 0) { 1137 error = sdp->sd_lockstruct.ls_jid; 1138 sdp->sd_lockstruct.ls_jid = 0; 1139 goto fail_sb; 1140 } 1141 1142 if (sdp->sd_args.ar_spectator) 1143 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1144 sdp->sd_table_name); 1145 else 1146 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1147 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1148 1149 error = init_inodes(sdp, DO); 1150 if (error) 1151 goto fail_sb; 1152 1153 error = init_per_node(sdp, DO); 1154 if (error) 1155 goto fail_inodes; 1156 1157 error = gfs2_statfs_init(sdp); 1158 if (error) { 1159 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1160 goto fail_per_node; 1161 } 1162 1163 if (!sb_rdonly(sb)) { 1164 error = gfs2_make_fs_rw(sdp); 1165 if (error) { 1166 fs_err(sdp, "can't make FS RW: %d\n", error); 1167 goto fail_per_node; 1168 } 1169 } 1170 1171 gfs2_glock_dq_uninit(&mount_gh); 1172 gfs2_online_uevent(sdp); 1173 return 0; 1174 1175 fail_per_node: 1176 init_per_node(sdp, UNDO); 1177 fail_inodes: 1178 init_inodes(sdp, UNDO); 1179 fail_sb: 1180 if (sdp->sd_root_dir) 1181 dput(sdp->sd_root_dir); 1182 if (sdp->sd_master_dir) 1183 dput(sdp->sd_master_dir); 1184 if (sb->s_root) 1185 dput(sb->s_root); 1186 sb->s_root = NULL; 1187 fail_locking: 1188 init_locking(sdp, &mount_gh, UNDO); 1189 fail_lm: 1190 complete_all(&sdp->sd_journal_ready); 1191 gfs2_gl_hash_clear(sdp); 1192 gfs2_lm_unmount(sdp); 1193 fail_debug: 1194 gfs2_delete_debugfs_file(sdp); 1195 free_percpu(sdp->sd_lkstats); 1196 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1197 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1198 gfs2_sys_fs_del(sdp); 1199 sb->s_fs_info = NULL; 1200 return error; 1201 } 1202 1203 static int set_gfs2_super(struct super_block *s, void *data) 1204 { 1205 s->s_bdev = data; 1206 s->s_dev = s->s_bdev->bd_dev; 1207 s->s_bdi = bdi_get(s->s_bdev->bd_bdi); 1208 return 0; 1209 } 1210 1211 static int test_gfs2_super(struct super_block *s, void *ptr) 1212 { 1213 struct block_device *bdev = ptr; 1214 return (bdev == s->s_bdev); 1215 } 1216 1217 /** 1218 * gfs2_mount - Get the GFS2 superblock 1219 * @fs_type: The GFS2 filesystem type 1220 * @flags: Mount flags 1221 * @dev_name: The name of the device 1222 * @data: The mount arguments 1223 * 1224 * Q. Why not use get_sb_bdev() ? 1225 * A. We need to select one of two root directories to mount, independent 1226 * of whether this is the initial, or subsequent, mount of this sb 1227 * 1228 * Returns: 0 or -ve on error 1229 */ 1230 1231 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1232 const char *dev_name, void *data) 1233 { 1234 struct block_device *bdev; 1235 struct super_block *s; 1236 fmode_t mode = FMODE_READ | FMODE_EXCL; 1237 int error; 1238 struct gfs2_args args; 1239 struct gfs2_sbd *sdp; 1240 1241 if (!(flags & SB_RDONLY)) 1242 mode |= FMODE_WRITE; 1243 1244 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1245 if (IS_ERR(bdev)) 1246 return ERR_CAST(bdev); 1247 1248 /* 1249 * once the super is inserted into the list by sget, s_umount 1250 * will protect the lockfs code from trying to start a snapshot 1251 * while we are mounting 1252 */ 1253 mutex_lock(&bdev->bd_fsfreeze_mutex); 1254 if (bdev->bd_fsfreeze_count > 0) { 1255 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1256 error = -EBUSY; 1257 goto error_bdev; 1258 } 1259 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1260 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1261 error = PTR_ERR(s); 1262 if (IS_ERR(s)) 1263 goto error_bdev; 1264 1265 if (s->s_root) { 1266 /* 1267 * s_umount nests inside bd_mutex during 1268 * __invalidate_device(). blkdev_put() acquires 1269 * bd_mutex and can't be called under s_umount. Drop 1270 * s_umount temporarily. This is safe as we're 1271 * holding an active reference. 1272 */ 1273 up_write(&s->s_umount); 1274 blkdev_put(bdev, mode); 1275 down_write(&s->s_umount); 1276 } else { 1277 /* s_mode must be set before deactivate_locked_super calls */ 1278 s->s_mode = mode; 1279 } 1280 1281 memset(&args, 0, sizeof(args)); 1282 args.ar_quota = GFS2_QUOTA_DEFAULT; 1283 args.ar_data = GFS2_DATA_DEFAULT; 1284 args.ar_commit = 30; 1285 args.ar_statfs_quantum = 30; 1286 args.ar_quota_quantum = 60; 1287 args.ar_errors = GFS2_ERRORS_DEFAULT; 1288 1289 error = gfs2_mount_args(&args, data); 1290 if (error) { 1291 pr_warn("can't parse mount arguments\n"); 1292 goto error_super; 1293 } 1294 1295 if (s->s_root) { 1296 error = -EBUSY; 1297 if ((flags ^ s->s_flags) & SB_RDONLY) 1298 goto error_super; 1299 } else { 1300 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1301 sb_set_blocksize(s, block_size(bdev)); 1302 error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0); 1303 if (error) 1304 goto error_super; 1305 s->s_flags |= SB_ACTIVE; 1306 bdev->bd_super = s; 1307 } 1308 1309 sdp = s->s_fs_info; 1310 if (args.ar_meta) 1311 return dget(sdp->sd_master_dir); 1312 else 1313 return dget(sdp->sd_root_dir); 1314 1315 error_super: 1316 deactivate_locked_super(s); 1317 return ERR_PTR(error); 1318 error_bdev: 1319 blkdev_put(bdev, mode); 1320 return ERR_PTR(error); 1321 } 1322 1323 static int set_meta_super(struct super_block *s, void *ptr) 1324 { 1325 return -EINVAL; 1326 } 1327 1328 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1329 int flags, const char *dev_name, void *data) 1330 { 1331 struct super_block *s; 1332 struct gfs2_sbd *sdp; 1333 struct path path; 1334 int error; 1335 1336 if (!dev_name || !*dev_name) 1337 return ERR_PTR(-EINVAL); 1338 1339 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1340 if (error) { 1341 pr_warn("path_lookup on %s returned error %d\n", 1342 dev_name, error); 1343 return ERR_PTR(error); 1344 } 1345 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1346 path.dentry->d_sb->s_bdev); 1347 path_put(&path); 1348 if (IS_ERR(s)) { 1349 pr_warn("gfs2 mount does not exist\n"); 1350 return ERR_CAST(s); 1351 } 1352 if ((flags ^ s->s_flags) & SB_RDONLY) { 1353 deactivate_locked_super(s); 1354 return ERR_PTR(-EBUSY); 1355 } 1356 sdp = s->s_fs_info; 1357 return dget(sdp->sd_master_dir); 1358 } 1359 1360 static void gfs2_kill_sb(struct super_block *sb) 1361 { 1362 struct gfs2_sbd *sdp = sb->s_fs_info; 1363 1364 if (sdp == NULL) { 1365 kill_block_super(sb); 1366 return; 1367 } 1368 1369 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1370 dput(sdp->sd_root_dir); 1371 dput(sdp->sd_master_dir); 1372 sdp->sd_root_dir = NULL; 1373 sdp->sd_master_dir = NULL; 1374 shrink_dcache_sb(sb); 1375 free_percpu(sdp->sd_lkstats); 1376 kill_block_super(sb); 1377 } 1378 1379 struct file_system_type gfs2_fs_type = { 1380 .name = "gfs2", 1381 .fs_flags = FS_REQUIRES_DEV, 1382 .mount = gfs2_mount, 1383 .kill_sb = gfs2_kill_sb, 1384 .owner = THIS_MODULE, 1385 }; 1386 MODULE_ALIAS_FS("gfs2"); 1387 1388 struct file_system_type gfs2meta_fs_type = { 1389 .name = "gfs2meta", 1390 .fs_flags = FS_REQUIRES_DEV, 1391 .mount = gfs2_mount_meta, 1392 .owner = THIS_MODULE, 1393 }; 1394 MODULE_ALIAS_FS("gfs2meta"); 1395