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 #include "lops.h" 45 46 #define DO 0 47 #define UNDO 1 48 49 /** 50 * gfs2_tune_init - Fill a gfs2_tune structure with default values 51 * @gt: tune 52 * 53 */ 54 55 static void gfs2_tune_init(struct gfs2_tune *gt) 56 { 57 spin_lock_init(>->gt_spin); 58 59 gt->gt_quota_warn_period = 10; 60 gt->gt_quota_scale_num = 1; 61 gt->gt_quota_scale_den = 1; 62 gt->gt_new_files_jdata = 0; 63 gt->gt_max_readahead = BIT(18); 64 gt->gt_complain_secs = 10; 65 } 66 67 static struct gfs2_sbd *init_sbd(struct super_block *sb) 68 { 69 struct gfs2_sbd *sdp; 70 struct address_space *mapping; 71 72 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 73 if (!sdp) 74 return NULL; 75 76 sdp->sd_vfs = sb; 77 sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats); 78 if (!sdp->sd_lkstats) { 79 kfree(sdp); 80 return NULL; 81 } 82 sb->s_fs_info = sdp; 83 84 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 85 gfs2_tune_init(&sdp->sd_tune); 86 87 init_waitqueue_head(&sdp->sd_glock_wait); 88 atomic_set(&sdp->sd_glock_disposal, 0); 89 init_completion(&sdp->sd_locking_init); 90 init_completion(&sdp->sd_wdack); 91 spin_lock_init(&sdp->sd_statfs_spin); 92 93 spin_lock_init(&sdp->sd_rindex_spin); 94 sdp->sd_rindex_tree.rb_node = NULL; 95 96 INIT_LIST_HEAD(&sdp->sd_jindex_list); 97 spin_lock_init(&sdp->sd_jindex_spin); 98 mutex_init(&sdp->sd_jindex_mutex); 99 init_completion(&sdp->sd_journal_ready); 100 101 INIT_LIST_HEAD(&sdp->sd_quota_list); 102 mutex_init(&sdp->sd_quota_mutex); 103 mutex_init(&sdp->sd_quota_sync_mutex); 104 init_waitqueue_head(&sdp->sd_quota_wait); 105 INIT_LIST_HEAD(&sdp->sd_trunc_list); 106 spin_lock_init(&sdp->sd_trunc_lock); 107 spin_lock_init(&sdp->sd_bitmap_lock); 108 109 mapping = &sdp->sd_aspace; 110 111 address_space_init_once(mapping); 112 mapping->a_ops = &gfs2_rgrp_aops; 113 mapping->host = sb->s_bdev->bd_inode; 114 mapping->flags = 0; 115 mapping_set_gfp_mask(mapping, GFP_NOFS); 116 mapping->private_data = NULL; 117 mapping->writeback_index = 0; 118 119 spin_lock_init(&sdp->sd_log_lock); 120 atomic_set(&sdp->sd_log_pinned, 0); 121 INIT_LIST_HEAD(&sdp->sd_log_revokes); 122 INIT_LIST_HEAD(&sdp->sd_log_ordered); 123 spin_lock_init(&sdp->sd_ordered_lock); 124 125 init_waitqueue_head(&sdp->sd_log_waitq); 126 init_waitqueue_head(&sdp->sd_logd_waitq); 127 spin_lock_init(&sdp->sd_ail_lock); 128 INIT_LIST_HEAD(&sdp->sd_ail1_list); 129 INIT_LIST_HEAD(&sdp->sd_ail2_list); 130 131 init_rwsem(&sdp->sd_log_flush_lock); 132 atomic_set(&sdp->sd_log_in_flight, 0); 133 atomic_set(&sdp->sd_reserving_log, 0); 134 init_waitqueue_head(&sdp->sd_reserving_log_wait); 135 init_waitqueue_head(&sdp->sd_log_flush_wait); 136 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 137 mutex_init(&sdp->sd_freeze_mutex); 138 139 return sdp; 140 } 141 142 143 /** 144 * gfs2_check_sb - Check superblock 145 * @sdp: the filesystem 146 * @sb: The superblock 147 * @silent: Don't print a message if the check fails 148 * 149 * Checks the version code of the FS is one that we understand how to 150 * read and that the sizes of the various on-disk structures have not 151 * changed. 152 */ 153 154 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 155 { 156 struct gfs2_sb_host *sb = &sdp->sd_sb; 157 158 if (sb->sb_magic != GFS2_MAGIC || 159 sb->sb_type != GFS2_METATYPE_SB) { 160 if (!silent) 161 pr_warn("not a GFS2 filesystem\n"); 162 return -EINVAL; 163 } 164 165 /* If format numbers match exactly, we're done. */ 166 167 if (sb->sb_fs_format == GFS2_FORMAT_FS && 168 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 169 return 0; 170 171 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 172 173 return -EINVAL; 174 } 175 176 static void end_bio_io_page(struct bio *bio) 177 { 178 struct page *page = bio->bi_private; 179 180 if (!bio->bi_status) 181 SetPageUptodate(page); 182 else 183 pr_warn("error %d reading superblock\n", bio->bi_status); 184 unlock_page(page); 185 } 186 187 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 188 { 189 struct gfs2_sb_host *sb = &sdp->sd_sb; 190 struct super_block *s = sdp->sd_vfs; 191 const struct gfs2_sb *str = buf; 192 193 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 194 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 195 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 196 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 197 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 198 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 199 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 200 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 201 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 202 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 203 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 204 205 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 206 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 207 memcpy(&s->s_uuid, str->sb_uuid, 16); 208 } 209 210 /** 211 * gfs2_read_super - Read the gfs2 super block from disk 212 * @sdp: The GFS2 super block 213 * @sector: The location of the super block 214 * @error: The error code to return 215 * 216 * This uses the bio functions to read the super block from disk 217 * because we want to be 100% sure that we never read cached data. 218 * A super block is read twice only during each GFS2 mount and is 219 * never written to by the filesystem. The first time its read no 220 * locks are held, and the only details which are looked at are those 221 * relating to the locking protocol. Once locking is up and working, 222 * the sb is read again under the lock to establish the location of 223 * the master directory (contains pointers to journals etc) and the 224 * root directory. 225 * 226 * Returns: 0 on success or error 227 */ 228 229 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 230 { 231 struct super_block *sb = sdp->sd_vfs; 232 struct gfs2_sb *p; 233 struct page *page; 234 struct bio *bio; 235 236 page = alloc_page(GFP_NOFS); 237 if (unlikely(!page)) 238 return -ENOMEM; 239 240 ClearPageUptodate(page); 241 ClearPageDirty(page); 242 lock_page(page); 243 244 bio = bio_alloc(GFP_NOFS, 1); 245 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 246 bio_set_dev(bio, sb->s_bdev); 247 bio_add_page(bio, page, PAGE_SIZE, 0); 248 249 bio->bi_end_io = end_bio_io_page; 250 bio->bi_private = page; 251 bio_set_op_attrs(bio, REQ_OP_READ, REQ_META); 252 submit_bio(bio); 253 wait_on_page_locked(page); 254 bio_put(bio); 255 if (!PageUptodate(page)) { 256 __free_page(page); 257 return -EIO; 258 } 259 p = kmap(page); 260 gfs2_sb_in(sdp, p); 261 kunmap(page); 262 __free_page(page); 263 return gfs2_check_sb(sdp, silent); 264 } 265 266 /** 267 * gfs2_read_sb - Read super block 268 * @sdp: The GFS2 superblock 269 * @silent: Don't print message if mount fails 270 * 271 */ 272 273 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 274 { 275 u32 hash_blocks, ind_blocks, leaf_blocks; 276 u32 tmp_blocks; 277 unsigned int x; 278 int error; 279 280 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 281 if (error) { 282 if (!silent) 283 fs_err(sdp, "can't read superblock\n"); 284 return error; 285 } 286 287 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 288 GFS2_BASIC_BLOCK_SHIFT; 289 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 290 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 291 sizeof(struct gfs2_dinode)) / sizeof(u64); 292 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 293 sizeof(struct gfs2_meta_header)) / sizeof(u64); 294 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 295 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 296 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 297 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 298 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_meta_header)) / 300 sizeof(struct gfs2_quota_change); 301 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 302 sizeof(struct gfs2_meta_header)) 303 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 304 305 /* Compute maximum reservation required to add a entry to a directory */ 306 307 hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH), 308 sdp->sd_jbsize); 309 310 ind_blocks = 0; 311 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 312 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 313 ind_blocks += tmp_blocks; 314 } 315 316 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 317 318 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 319 320 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 321 sizeof(struct gfs2_dinode); 322 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 323 for (x = 2;; x++) { 324 u64 space, d; 325 u32 m; 326 327 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 328 d = space; 329 m = do_div(d, sdp->sd_inptrs); 330 331 if (d != sdp->sd_heightsize[x - 1] || m) 332 break; 333 sdp->sd_heightsize[x] = space; 334 } 335 sdp->sd_max_height = x; 336 sdp->sd_heightsize[x] = ~0; 337 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 338 339 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 340 sizeof(struct gfs2_leaf)) / 341 GFS2_MIN_DIRENT_SIZE; 342 return 0; 343 } 344 345 static int init_names(struct gfs2_sbd *sdp, int silent) 346 { 347 char *proto, *table; 348 int error = 0; 349 350 proto = sdp->sd_args.ar_lockproto; 351 table = sdp->sd_args.ar_locktable; 352 353 /* Try to autodetect */ 354 355 if (!proto[0] || !table[0]) { 356 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 357 if (error) 358 return error; 359 360 if (!proto[0]) 361 proto = sdp->sd_sb.sb_lockproto; 362 if (!table[0]) 363 table = sdp->sd_sb.sb_locktable; 364 } 365 366 if (!table[0]) 367 table = sdp->sd_vfs->s_id; 368 369 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 370 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 371 372 table = sdp->sd_table_name; 373 while ((table = strchr(table, '/'))) 374 *table = '_'; 375 376 return error; 377 } 378 379 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 380 int undo) 381 { 382 int error = 0; 383 384 if (undo) 385 goto fail_trans; 386 387 error = gfs2_glock_nq_num(sdp, 388 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 389 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 390 mount_gh); 391 if (error) { 392 fs_err(sdp, "can't acquire mount glock: %d\n", error); 393 goto fail; 394 } 395 396 error = gfs2_glock_nq_num(sdp, 397 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 398 LM_ST_SHARED, 399 LM_FLAG_NOEXP | GL_EXACT, 400 &sdp->sd_live_gh); 401 if (error) { 402 fs_err(sdp, "can't acquire live glock: %d\n", error); 403 goto fail_mount; 404 } 405 406 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 407 CREATE, &sdp->sd_rename_gl); 408 if (error) { 409 fs_err(sdp, "can't create rename glock: %d\n", error); 410 goto fail_live; 411 } 412 413 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 414 CREATE, &sdp->sd_freeze_gl); 415 if (error) { 416 fs_err(sdp, "can't create transaction glock: %d\n", error); 417 goto fail_rename; 418 } 419 420 return 0; 421 422 fail_trans: 423 gfs2_glock_put(sdp->sd_freeze_gl); 424 fail_rename: 425 gfs2_glock_put(sdp->sd_rename_gl); 426 fail_live: 427 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 428 fail_mount: 429 gfs2_glock_dq_uninit(mount_gh); 430 fail: 431 return error; 432 } 433 434 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 435 u64 no_addr, const char *name) 436 { 437 struct gfs2_sbd *sdp = sb->s_fs_info; 438 struct dentry *dentry; 439 struct inode *inode; 440 441 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 442 GFS2_BLKST_FREE /* ignore */); 443 if (IS_ERR(inode)) { 444 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 445 return PTR_ERR(inode); 446 } 447 dentry = d_make_root(inode); 448 if (!dentry) { 449 fs_err(sdp, "can't alloc %s dentry\n", name); 450 return -ENOMEM; 451 } 452 *dptr = dentry; 453 return 0; 454 } 455 456 static int init_sb(struct gfs2_sbd *sdp, int silent) 457 { 458 struct super_block *sb = sdp->sd_vfs; 459 struct gfs2_holder sb_gh; 460 u64 no_addr; 461 int ret; 462 463 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 464 LM_ST_SHARED, 0, &sb_gh); 465 if (ret) { 466 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 467 return ret; 468 } 469 470 ret = gfs2_read_sb(sdp, silent); 471 if (ret) { 472 fs_err(sdp, "can't read superblock: %d\n", ret); 473 goto out; 474 } 475 476 /* Set up the buffer cache and SB for real */ 477 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 478 ret = -EINVAL; 479 fs_err(sdp, "FS block size (%u) is too small for device " 480 "block size (%u)\n", 481 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 482 goto out; 483 } 484 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 485 ret = -EINVAL; 486 fs_err(sdp, "FS block size (%u) is too big for machine " 487 "page size (%u)\n", 488 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 489 goto out; 490 } 491 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 492 493 /* Get the root inode */ 494 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 495 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 496 if (ret) 497 goto out; 498 499 /* Get the master inode */ 500 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 501 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 502 if (ret) { 503 dput(sdp->sd_root_dir); 504 goto out; 505 } 506 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 507 out: 508 gfs2_glock_dq_uninit(&sb_gh); 509 return ret; 510 } 511 512 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 513 { 514 char *message = "FIRSTMOUNT=Done"; 515 char *envp[] = { message, NULL }; 516 517 fs_info(sdp, "first mount done, others may mount\n"); 518 519 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 520 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 521 522 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 523 } 524 525 /** 526 * gfs2_jindex_hold - Grab a lock on the jindex 527 * @sdp: The GFS2 superblock 528 * @ji_gh: the holder for the jindex glock 529 * 530 * Returns: errno 531 */ 532 533 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 534 { 535 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 536 struct qstr name; 537 char buf[20]; 538 struct gfs2_jdesc *jd; 539 int error; 540 541 name.name = buf; 542 543 mutex_lock(&sdp->sd_jindex_mutex); 544 545 for (;;) { 546 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 547 if (error) 548 break; 549 550 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 551 name.hash = gfs2_disk_hash(name.name, name.len); 552 553 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 554 if (error == -ENOENT) { 555 error = 0; 556 break; 557 } 558 559 gfs2_glock_dq_uninit(ji_gh); 560 561 if (error) 562 break; 563 564 error = -ENOMEM; 565 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 566 if (!jd) 567 break; 568 569 INIT_LIST_HEAD(&jd->extent_list); 570 INIT_LIST_HEAD(&jd->jd_revoke_list); 571 572 INIT_WORK(&jd->jd_work, gfs2_recover_func); 573 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 574 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 575 if (!jd->jd_inode) 576 error = -ENOENT; 577 else 578 error = PTR_ERR(jd->jd_inode); 579 kfree(jd); 580 break; 581 } 582 583 spin_lock(&sdp->sd_jindex_spin); 584 jd->jd_jid = sdp->sd_journals++; 585 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 586 spin_unlock(&sdp->sd_jindex_spin); 587 } 588 589 mutex_unlock(&sdp->sd_jindex_mutex); 590 591 return error; 592 } 593 594 /** 595 * check_journal_clean - Make sure a journal is clean for a spectator mount 596 * @sdp: The GFS2 superblock 597 * @jd: The journal descriptor 598 * 599 * Returns: 0 if the journal is clean or locked, else an error 600 */ 601 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 602 { 603 int error; 604 struct gfs2_holder j_gh; 605 struct gfs2_log_header_host head; 606 struct gfs2_inode *ip; 607 608 ip = GFS2_I(jd->jd_inode); 609 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 610 GL_EXACT | GL_NOCACHE, &j_gh); 611 if (error) { 612 fs_err(sdp, "Error locking journal for spectator mount.\n"); 613 return -EPERM; 614 } 615 error = gfs2_jdesc_check(jd); 616 if (error) { 617 fs_err(sdp, "Error checking journal for spectator mount.\n"); 618 goto out_unlock; 619 } 620 error = gfs2_find_jhead(jd, &head, false); 621 if (error) { 622 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 623 goto out_unlock; 624 } 625 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 626 error = -EPERM; 627 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 628 "must not be a spectator.\n", jd->jd_jid); 629 } 630 631 out_unlock: 632 gfs2_glock_dq_uninit(&j_gh); 633 return error; 634 } 635 636 static int init_journal(struct gfs2_sbd *sdp, int undo) 637 { 638 struct inode *master = d_inode(sdp->sd_master_dir); 639 struct gfs2_holder ji_gh; 640 struct gfs2_inode *ip; 641 int jindex = 1; 642 int error = 0; 643 644 if (undo) { 645 jindex = 0; 646 goto fail_jinode_gh; 647 } 648 649 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 650 if (IS_ERR(sdp->sd_jindex)) { 651 fs_err(sdp, "can't lookup journal index: %d\n", error); 652 return PTR_ERR(sdp->sd_jindex); 653 } 654 655 /* Load in the journal index special file */ 656 657 error = gfs2_jindex_hold(sdp, &ji_gh); 658 if (error) { 659 fs_err(sdp, "can't read journal index: %d\n", error); 660 goto fail; 661 } 662 663 error = -EUSERS; 664 if (!gfs2_jindex_size(sdp)) { 665 fs_err(sdp, "no journals!\n"); 666 goto fail_jindex; 667 } 668 669 atomic_set(&sdp->sd_log_blks_needed, 0); 670 if (sdp->sd_args.ar_spectator) { 671 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 672 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 673 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 674 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 675 } else { 676 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 677 fs_err(sdp, "can't mount journal #%u\n", 678 sdp->sd_lockstruct.ls_jid); 679 fs_err(sdp, "there are only %u journals (0 - %u)\n", 680 gfs2_jindex_size(sdp), 681 gfs2_jindex_size(sdp) - 1); 682 goto fail_jindex; 683 } 684 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 685 686 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 687 &gfs2_journal_glops, 688 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 689 &sdp->sd_journal_gh); 690 if (error) { 691 fs_err(sdp, "can't acquire journal glock: %d\n", error); 692 goto fail_jindex; 693 } 694 695 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 696 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 697 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 698 &sdp->sd_jinode_gh); 699 if (error) { 700 fs_err(sdp, "can't acquire journal inode glock: %d\n", 701 error); 702 goto fail_journal_gh; 703 } 704 705 error = gfs2_jdesc_check(sdp->sd_jdesc); 706 if (error) { 707 fs_err(sdp, "my journal (%u) is bad: %d\n", 708 sdp->sd_jdesc->jd_jid, error); 709 goto fail_jinode_gh; 710 } 711 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 712 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 713 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 714 715 /* Map the extents for this journal's blocks */ 716 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 717 } 718 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 719 720 if (sdp->sd_lockstruct.ls_first) { 721 unsigned int x; 722 for (x = 0; x < sdp->sd_journals; x++) { 723 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 724 725 if (sdp->sd_args.ar_spectator) { 726 error = check_journal_clean(sdp, jd); 727 if (error) 728 goto fail_jinode_gh; 729 continue; 730 } 731 error = gfs2_recover_journal(jd, true); 732 if (error) { 733 fs_err(sdp, "error recovering journal %u: %d\n", 734 x, error); 735 goto fail_jinode_gh; 736 } 737 } 738 739 gfs2_others_may_mount(sdp); 740 } else if (!sdp->sd_args.ar_spectator) { 741 error = gfs2_recover_journal(sdp->sd_jdesc, true); 742 if (error) { 743 fs_err(sdp, "error recovering my journal: %d\n", error); 744 goto fail_jinode_gh; 745 } 746 } 747 748 sdp->sd_log_idle = 1; 749 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 750 gfs2_glock_dq_uninit(&ji_gh); 751 jindex = 0; 752 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 753 return 0; 754 755 fail_jinode_gh: 756 if (!sdp->sd_args.ar_spectator) 757 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 758 fail_journal_gh: 759 if (!sdp->sd_args.ar_spectator) 760 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 761 fail_jindex: 762 gfs2_jindex_free(sdp); 763 if (jindex) 764 gfs2_glock_dq_uninit(&ji_gh); 765 fail: 766 iput(sdp->sd_jindex); 767 return error; 768 } 769 770 static struct lock_class_key gfs2_quota_imutex_key; 771 772 static int init_inodes(struct gfs2_sbd *sdp, int undo) 773 { 774 int error = 0; 775 struct inode *master = d_inode(sdp->sd_master_dir); 776 777 if (undo) 778 goto fail_qinode; 779 780 error = init_journal(sdp, undo); 781 complete_all(&sdp->sd_journal_ready); 782 if (error) 783 goto fail; 784 785 /* Read in the master statfs inode */ 786 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 787 if (IS_ERR(sdp->sd_statfs_inode)) { 788 error = PTR_ERR(sdp->sd_statfs_inode); 789 fs_err(sdp, "can't read in statfs inode: %d\n", error); 790 goto fail_journal; 791 } 792 793 /* Read in the resource index inode */ 794 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 795 if (IS_ERR(sdp->sd_rindex)) { 796 error = PTR_ERR(sdp->sd_rindex); 797 fs_err(sdp, "can't get resource index inode: %d\n", error); 798 goto fail_statfs; 799 } 800 sdp->sd_rindex_uptodate = 0; 801 802 /* Read in the quota inode */ 803 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 804 if (IS_ERR(sdp->sd_quota_inode)) { 805 error = PTR_ERR(sdp->sd_quota_inode); 806 fs_err(sdp, "can't get quota file inode: %d\n", error); 807 goto fail_rindex; 808 } 809 /* 810 * i_rwsem on quota files is special. Since this inode is hidden system 811 * file, we are safe to define locking ourselves. 812 */ 813 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 814 &gfs2_quota_imutex_key); 815 816 error = gfs2_rindex_update(sdp); 817 if (error) 818 goto fail_qinode; 819 820 return 0; 821 822 fail_qinode: 823 iput(sdp->sd_quota_inode); 824 fail_rindex: 825 gfs2_clear_rgrpd(sdp); 826 iput(sdp->sd_rindex); 827 fail_statfs: 828 iput(sdp->sd_statfs_inode); 829 fail_journal: 830 init_journal(sdp, UNDO); 831 fail: 832 return error; 833 } 834 835 static int init_per_node(struct gfs2_sbd *sdp, int undo) 836 { 837 struct inode *pn = NULL; 838 char buf[30]; 839 int error = 0; 840 struct gfs2_inode *ip; 841 struct inode *master = d_inode(sdp->sd_master_dir); 842 843 if (sdp->sd_args.ar_spectator) 844 return 0; 845 846 if (undo) 847 goto fail_qc_gh; 848 849 pn = gfs2_lookup_simple(master, "per_node"); 850 if (IS_ERR(pn)) { 851 error = PTR_ERR(pn); 852 fs_err(sdp, "can't find per_node directory: %d\n", error); 853 return error; 854 } 855 856 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 857 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 858 if (IS_ERR(sdp->sd_sc_inode)) { 859 error = PTR_ERR(sdp->sd_sc_inode); 860 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 861 goto fail; 862 } 863 864 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 865 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 866 if (IS_ERR(sdp->sd_qc_inode)) { 867 error = PTR_ERR(sdp->sd_qc_inode); 868 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 869 goto fail_ut_i; 870 } 871 872 iput(pn); 873 pn = NULL; 874 875 ip = GFS2_I(sdp->sd_sc_inode); 876 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 877 &sdp->sd_sc_gh); 878 if (error) { 879 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 880 goto fail_qc_i; 881 } 882 883 ip = GFS2_I(sdp->sd_qc_inode); 884 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 885 &sdp->sd_qc_gh); 886 if (error) { 887 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 888 goto fail_ut_gh; 889 } 890 891 return 0; 892 893 fail_qc_gh: 894 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 895 fail_ut_gh: 896 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 897 fail_qc_i: 898 iput(sdp->sd_qc_inode); 899 fail_ut_i: 900 iput(sdp->sd_sc_inode); 901 fail: 902 iput(pn); 903 return error; 904 } 905 906 static const match_table_t nolock_tokens = { 907 { Opt_jid, "jid=%d\n", }, 908 { Opt_err, NULL }, 909 }; 910 911 static const struct lm_lockops nolock_ops = { 912 .lm_proto_name = "lock_nolock", 913 .lm_put_lock = gfs2_glock_free, 914 .lm_tokens = &nolock_tokens, 915 }; 916 917 /** 918 * gfs2_lm_mount - mount a locking protocol 919 * @sdp: the filesystem 920 * @args: mount arguments 921 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 922 * 923 * Returns: errno 924 */ 925 926 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 927 { 928 const struct lm_lockops *lm; 929 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 930 struct gfs2_args *args = &sdp->sd_args; 931 const char *proto = sdp->sd_proto_name; 932 const char *table = sdp->sd_table_name; 933 char *o, *options; 934 int ret; 935 936 if (!strcmp("lock_nolock", proto)) { 937 lm = &nolock_ops; 938 sdp->sd_args.ar_localflocks = 1; 939 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 940 } else if (!strcmp("lock_dlm", proto)) { 941 lm = &gfs2_dlm_ops; 942 #endif 943 } else { 944 pr_info("can't find protocol %s\n", proto); 945 return -ENOENT; 946 } 947 948 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 949 950 ls->ls_ops = lm; 951 ls->ls_first = 1; 952 953 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 954 substring_t tmp[MAX_OPT_ARGS]; 955 int token, option; 956 957 if (!o || !*o) 958 continue; 959 960 token = match_token(o, *lm->lm_tokens, tmp); 961 switch (token) { 962 case Opt_jid: 963 ret = match_int(&tmp[0], &option); 964 if (ret || option < 0) 965 goto hostdata_error; 966 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 967 ls->ls_jid = option; 968 break; 969 case Opt_id: 970 case Opt_nodir: 971 /* Obsolete, but left for backward compat purposes */ 972 break; 973 case Opt_first: 974 ret = match_int(&tmp[0], &option); 975 if (ret || (option != 0 && option != 1)) 976 goto hostdata_error; 977 ls->ls_first = option; 978 break; 979 case Opt_err: 980 default: 981 hostdata_error: 982 fs_info(sdp, "unknown hostdata (%s)\n", o); 983 return -EINVAL; 984 } 985 } 986 987 if (lm->lm_mount == NULL) { 988 fs_info(sdp, "Now mounting FS...\n"); 989 complete_all(&sdp->sd_locking_init); 990 return 0; 991 } 992 ret = lm->lm_mount(sdp, table); 993 if (ret == 0) 994 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 995 complete_all(&sdp->sd_locking_init); 996 return ret; 997 } 998 999 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1000 { 1001 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1002 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1003 lm->lm_unmount) 1004 lm->lm_unmount(sdp); 1005 } 1006 1007 static int wait_on_journal(struct gfs2_sbd *sdp) 1008 { 1009 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1010 return 0; 1011 1012 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1013 ? -EINTR : 0; 1014 } 1015 1016 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1017 { 1018 struct super_block *sb = sdp->sd_vfs; 1019 char ro[20]; 1020 char spectator[20]; 1021 char *envp[] = { ro, spectator, NULL }; 1022 sprintf(ro, "RDONLY=%d", sb_rdonly(sb)); 1023 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1024 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1025 } 1026 1027 /** 1028 * fill_super - Read in superblock 1029 * @sb: The VFS superblock 1030 * @data: Mount options 1031 * @silent: Don't complain if it's not a GFS2 filesystem 1032 * 1033 * Returns: errno 1034 */ 1035 1036 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1037 { 1038 struct gfs2_sbd *sdp; 1039 struct gfs2_holder mount_gh; 1040 int error; 1041 1042 sdp = init_sbd(sb); 1043 if (!sdp) { 1044 pr_warn("can't alloc struct gfs2_sbd\n"); 1045 return -ENOMEM; 1046 } 1047 sdp->sd_args = *args; 1048 1049 if (sdp->sd_args.ar_spectator) { 1050 sb->s_flags |= SB_RDONLY; 1051 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1052 } 1053 if (sdp->sd_args.ar_posix_acl) 1054 sb->s_flags |= SB_POSIXACL; 1055 if (sdp->sd_args.ar_nobarrier) 1056 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1057 1058 sb->s_flags |= SB_NOSEC; 1059 sb->s_magic = GFS2_MAGIC; 1060 sb->s_op = &gfs2_super_ops; 1061 sb->s_d_op = &gfs2_dops; 1062 sb->s_export_op = &gfs2_export_ops; 1063 sb->s_xattr = gfs2_xattr_handlers; 1064 sb->s_qcop = &gfs2_quotactl_ops; 1065 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1066 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1067 sb->s_time_gran = 1; 1068 sb->s_maxbytes = MAX_LFS_FILESIZE; 1069 1070 /* Set up the buffer cache and fill in some fake block size values 1071 to allow us to read-in the on-disk superblock. */ 1072 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1073 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1074 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1075 GFS2_BASIC_BLOCK_SHIFT; 1076 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1077 1078 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1079 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1080 if (sdp->sd_args.ar_statfs_quantum) { 1081 sdp->sd_tune.gt_statfs_slow = 0; 1082 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1083 } else { 1084 sdp->sd_tune.gt_statfs_slow = 1; 1085 sdp->sd_tune.gt_statfs_quantum = 30; 1086 } 1087 1088 error = init_names(sdp, silent); 1089 if (error) { 1090 /* In this case, we haven't initialized sysfs, so we have to 1091 manually free the sdp. */ 1092 free_percpu(sdp->sd_lkstats); 1093 kfree(sdp); 1094 sb->s_fs_info = NULL; 1095 return error; 1096 } 1097 1098 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name); 1099 1100 error = gfs2_sys_fs_add(sdp); 1101 /* 1102 * If we hit an error here, gfs2_sys_fs_add will have called function 1103 * kobject_put which causes the sysfs usage count to go to zero, which 1104 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1105 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1106 * kobject_put to free sdp. 1107 */ 1108 if (error) 1109 return error; 1110 1111 gfs2_create_debugfs_file(sdp); 1112 1113 error = gfs2_lm_mount(sdp, silent); 1114 if (error) 1115 goto fail_debug; 1116 1117 error = init_locking(sdp, &mount_gh, DO); 1118 if (error) 1119 goto fail_lm; 1120 1121 error = init_sb(sdp, silent); 1122 if (error) 1123 goto fail_locking; 1124 1125 error = wait_on_journal(sdp); 1126 if (error) 1127 goto fail_sb; 1128 1129 /* 1130 * If user space has failed to join the cluster or some similar 1131 * failure has occurred, then the journal id will contain a 1132 * negative (error) number. This will then be returned to the 1133 * caller (of the mount syscall). We do this even for spectator 1134 * mounts (which just write a jid of 0 to indicate "ok" even though 1135 * the jid is unused in the spectator case) 1136 */ 1137 if (sdp->sd_lockstruct.ls_jid < 0) { 1138 error = sdp->sd_lockstruct.ls_jid; 1139 sdp->sd_lockstruct.ls_jid = 0; 1140 goto fail_sb; 1141 } 1142 1143 if (sdp->sd_args.ar_spectator) 1144 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s", 1145 sdp->sd_table_name); 1146 else 1147 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u", 1148 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1149 1150 error = init_inodes(sdp, DO); 1151 if (error) 1152 goto fail_sb; 1153 1154 error = init_per_node(sdp, DO); 1155 if (error) 1156 goto fail_inodes; 1157 1158 error = gfs2_statfs_init(sdp); 1159 if (error) { 1160 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1161 goto fail_per_node; 1162 } 1163 1164 if (!sb_rdonly(sb)) { 1165 error = gfs2_make_fs_rw(sdp); 1166 if (error) { 1167 fs_err(sdp, "can't make FS RW: %d\n", error); 1168 goto fail_per_node; 1169 } 1170 } 1171 1172 gfs2_glock_dq_uninit(&mount_gh); 1173 gfs2_online_uevent(sdp); 1174 return 0; 1175 1176 fail_per_node: 1177 init_per_node(sdp, UNDO); 1178 fail_inodes: 1179 init_inodes(sdp, UNDO); 1180 fail_sb: 1181 if (sdp->sd_root_dir) 1182 dput(sdp->sd_root_dir); 1183 if (sdp->sd_master_dir) 1184 dput(sdp->sd_master_dir); 1185 if (sb->s_root) 1186 dput(sb->s_root); 1187 sb->s_root = NULL; 1188 fail_locking: 1189 init_locking(sdp, &mount_gh, UNDO); 1190 fail_lm: 1191 complete_all(&sdp->sd_journal_ready); 1192 gfs2_gl_hash_clear(sdp); 1193 gfs2_lm_unmount(sdp); 1194 fail_debug: 1195 gfs2_delete_debugfs_file(sdp); 1196 free_percpu(sdp->sd_lkstats); 1197 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1198 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1199 gfs2_sys_fs_del(sdp); 1200 sb->s_fs_info = NULL; 1201 return error; 1202 } 1203 1204 static int set_gfs2_super(struct super_block *s, void *data) 1205 { 1206 s->s_bdev = data; 1207 s->s_dev = s->s_bdev->bd_dev; 1208 s->s_bdi = bdi_get(s->s_bdev->bd_bdi); 1209 return 0; 1210 } 1211 1212 static int test_gfs2_super(struct super_block *s, void *ptr) 1213 { 1214 struct block_device *bdev = ptr; 1215 return (bdev == s->s_bdev); 1216 } 1217 1218 /** 1219 * gfs2_mount - Get the GFS2 superblock 1220 * @fs_type: The GFS2 filesystem type 1221 * @flags: Mount flags 1222 * @dev_name: The name of the device 1223 * @data: The mount arguments 1224 * 1225 * Q. Why not use get_sb_bdev() ? 1226 * A. We need to select one of two root directories to mount, independent 1227 * of whether this is the initial, or subsequent, mount of this sb 1228 * 1229 * Returns: 0 or -ve on error 1230 */ 1231 1232 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1233 const char *dev_name, void *data) 1234 { 1235 struct block_device *bdev; 1236 struct super_block *s; 1237 fmode_t mode = FMODE_READ | FMODE_EXCL; 1238 int error; 1239 struct gfs2_args args; 1240 struct gfs2_sbd *sdp; 1241 1242 if (!(flags & SB_RDONLY)) 1243 mode |= FMODE_WRITE; 1244 1245 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1246 if (IS_ERR(bdev)) 1247 return ERR_CAST(bdev); 1248 1249 /* 1250 * once the super is inserted into the list by sget, s_umount 1251 * will protect the lockfs code from trying to start a snapshot 1252 * while we are mounting 1253 */ 1254 mutex_lock(&bdev->bd_fsfreeze_mutex); 1255 if (bdev->bd_fsfreeze_count > 0) { 1256 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1257 error = -EBUSY; 1258 goto error_bdev; 1259 } 1260 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1261 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1262 error = PTR_ERR(s); 1263 if (IS_ERR(s)) 1264 goto error_bdev; 1265 1266 if (s->s_root) { 1267 /* 1268 * s_umount nests inside bd_mutex during 1269 * __invalidate_device(). blkdev_put() acquires 1270 * bd_mutex and can't be called under s_umount. Drop 1271 * s_umount temporarily. This is safe as we're 1272 * holding an active reference. 1273 */ 1274 up_write(&s->s_umount); 1275 blkdev_put(bdev, mode); 1276 down_write(&s->s_umount); 1277 } else { 1278 /* s_mode must be set before deactivate_locked_super calls */ 1279 s->s_mode = mode; 1280 } 1281 1282 memset(&args, 0, sizeof(args)); 1283 args.ar_quota = GFS2_QUOTA_DEFAULT; 1284 args.ar_data = GFS2_DATA_DEFAULT; 1285 args.ar_commit = 30; 1286 args.ar_statfs_quantum = 30; 1287 args.ar_quota_quantum = 60; 1288 args.ar_errors = GFS2_ERRORS_DEFAULT; 1289 1290 error = gfs2_mount_args(&args, data); 1291 if (error) { 1292 pr_warn("can't parse mount arguments\n"); 1293 goto error_super; 1294 } 1295 1296 if (s->s_root) { 1297 error = -EBUSY; 1298 if ((flags ^ s->s_flags) & SB_RDONLY) 1299 goto error_super; 1300 } else { 1301 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1302 sb_set_blocksize(s, block_size(bdev)); 1303 error = fill_super(s, &args, flags & SB_SILENT ? 1 : 0); 1304 if (error) 1305 goto error_super; 1306 s->s_flags |= SB_ACTIVE; 1307 bdev->bd_super = s; 1308 } 1309 1310 sdp = s->s_fs_info; 1311 if (args.ar_meta) 1312 return dget(sdp->sd_master_dir); 1313 else 1314 return dget(sdp->sd_root_dir); 1315 1316 error_super: 1317 deactivate_locked_super(s); 1318 return ERR_PTR(error); 1319 error_bdev: 1320 blkdev_put(bdev, mode); 1321 return ERR_PTR(error); 1322 } 1323 1324 static int set_meta_super(struct super_block *s, void *ptr) 1325 { 1326 return -EINVAL; 1327 } 1328 1329 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1330 int flags, const char *dev_name, void *data) 1331 { 1332 struct super_block *s; 1333 struct gfs2_sbd *sdp; 1334 struct path path; 1335 int error; 1336 1337 if (!dev_name || !*dev_name) 1338 return ERR_PTR(-EINVAL); 1339 1340 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1341 if (error) { 1342 pr_warn("path_lookup on %s returned error %d\n", 1343 dev_name, error); 1344 return ERR_PTR(error); 1345 } 1346 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1347 path.dentry->d_sb->s_bdev); 1348 path_put(&path); 1349 if (IS_ERR(s)) { 1350 pr_warn("gfs2 mount does not exist\n"); 1351 return ERR_CAST(s); 1352 } 1353 if ((flags ^ s->s_flags) & SB_RDONLY) { 1354 deactivate_locked_super(s); 1355 return ERR_PTR(-EBUSY); 1356 } 1357 sdp = s->s_fs_info; 1358 return dget(sdp->sd_master_dir); 1359 } 1360 1361 static void gfs2_kill_sb(struct super_block *sb) 1362 { 1363 struct gfs2_sbd *sdp = sb->s_fs_info; 1364 1365 if (sdp == NULL) { 1366 kill_block_super(sb); 1367 return; 1368 } 1369 1370 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB); 1371 dput(sdp->sd_root_dir); 1372 dput(sdp->sd_master_dir); 1373 sdp->sd_root_dir = NULL; 1374 sdp->sd_master_dir = NULL; 1375 shrink_dcache_sb(sb); 1376 free_percpu(sdp->sd_lkstats); 1377 kill_block_super(sb); 1378 } 1379 1380 struct file_system_type gfs2_fs_type = { 1381 .name = "gfs2", 1382 .fs_flags = FS_REQUIRES_DEV, 1383 .mount = gfs2_mount, 1384 .kill_sb = gfs2_kill_sb, 1385 .owner = THIS_MODULE, 1386 }; 1387 MODULE_ALIAS_FS("gfs2"); 1388 1389 struct file_system_type gfs2meta_fs_type = { 1390 .name = "gfs2meta", 1391 .fs_flags = FS_REQUIRES_DEV, 1392 .mount = gfs2_mount_meta, 1393 .owner = THIS_MODULE, 1394 }; 1395 MODULE_ALIAS_FS("gfs2meta"); 1396