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 sb->s_fs_info = sdp; 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 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_error) 180 SetPageUptodate(page); 181 else 182 pr_warn("error %d reading superblock\n", bio->bi_error); 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->bi_bdev = 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_jheightsize[0] = sdp->sd_sb.sb_bsize - 339 sizeof(struct gfs2_dinode); 340 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 341 for (x = 2;; x++) { 342 u64 space, d; 343 u32 m; 344 345 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 346 d = space; 347 m = do_div(d, sdp->sd_inptrs); 348 349 if (d != sdp->sd_jheightsize[x - 1] || m) 350 break; 351 sdp->sd_jheightsize[x] = space; 352 } 353 sdp->sd_max_jheight = x; 354 sdp->sd_jheightsize[x] = ~0; 355 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); 356 357 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 358 sizeof(struct gfs2_leaf)) / 359 GFS2_MIN_DIRENT_SIZE; 360 return 0; 361 } 362 363 static int init_names(struct gfs2_sbd *sdp, int silent) 364 { 365 char *proto, *table; 366 int error = 0; 367 368 proto = sdp->sd_args.ar_lockproto; 369 table = sdp->sd_args.ar_locktable; 370 371 /* Try to autodetect */ 372 373 if (!proto[0] || !table[0]) { 374 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 375 if (error) 376 return error; 377 378 if (!proto[0]) 379 proto = sdp->sd_sb.sb_lockproto; 380 if (!table[0]) 381 table = sdp->sd_sb.sb_locktable; 382 } 383 384 if (!table[0]) 385 table = sdp->sd_vfs->s_id; 386 387 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 388 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 389 390 table = sdp->sd_table_name; 391 while ((table = strchr(table, '/'))) 392 *table = '_'; 393 394 return error; 395 } 396 397 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 398 int undo) 399 { 400 int error = 0; 401 402 if (undo) 403 goto fail_trans; 404 405 error = gfs2_glock_nq_num(sdp, 406 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 407 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 408 mount_gh); 409 if (error) { 410 fs_err(sdp, "can't acquire mount glock: %d\n", error); 411 goto fail; 412 } 413 414 error = gfs2_glock_nq_num(sdp, 415 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 416 LM_ST_SHARED, 417 LM_FLAG_NOEXP | GL_EXACT, 418 &sdp->sd_live_gh); 419 if (error) { 420 fs_err(sdp, "can't acquire live glock: %d\n", error); 421 goto fail_mount; 422 } 423 424 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 425 CREATE, &sdp->sd_rename_gl); 426 if (error) { 427 fs_err(sdp, "can't create rename glock: %d\n", error); 428 goto fail_live; 429 } 430 431 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 432 CREATE, &sdp->sd_freeze_gl); 433 if (error) { 434 fs_err(sdp, "can't create transaction glock: %d\n", error); 435 goto fail_rename; 436 } 437 438 return 0; 439 440 fail_trans: 441 gfs2_glock_put(sdp->sd_freeze_gl); 442 fail_rename: 443 gfs2_glock_put(sdp->sd_rename_gl); 444 fail_live: 445 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 446 fail_mount: 447 gfs2_glock_dq_uninit(mount_gh); 448 fail: 449 return error; 450 } 451 452 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 453 u64 no_addr, const char *name) 454 { 455 struct gfs2_sbd *sdp = sb->s_fs_info; 456 struct dentry *dentry; 457 struct inode *inode; 458 459 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 460 GFS2_BLKST_FREE /* ignore */); 461 if (IS_ERR(inode)) { 462 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 463 return PTR_ERR(inode); 464 } 465 dentry = d_make_root(inode); 466 if (!dentry) { 467 fs_err(sdp, "can't alloc %s dentry\n", name); 468 return -ENOMEM; 469 } 470 *dptr = dentry; 471 return 0; 472 } 473 474 static int init_sb(struct gfs2_sbd *sdp, int silent) 475 { 476 struct super_block *sb = sdp->sd_vfs; 477 struct gfs2_holder sb_gh; 478 u64 no_addr; 479 int ret; 480 481 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 482 LM_ST_SHARED, 0, &sb_gh); 483 if (ret) { 484 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 485 return ret; 486 } 487 488 ret = gfs2_read_sb(sdp, silent); 489 if (ret) { 490 fs_err(sdp, "can't read superblock: %d\n", ret); 491 goto out; 492 } 493 494 /* Set up the buffer cache and SB for real */ 495 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 496 ret = -EINVAL; 497 fs_err(sdp, "FS block size (%u) is too small for device " 498 "block size (%u)\n", 499 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 500 goto out; 501 } 502 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 503 ret = -EINVAL; 504 fs_err(sdp, "FS block size (%u) is too big for machine " 505 "page size (%u)\n", 506 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 507 goto out; 508 } 509 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 510 511 /* Get the root inode */ 512 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 513 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 514 if (ret) 515 goto out; 516 517 /* Get the master inode */ 518 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 519 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 520 if (ret) { 521 dput(sdp->sd_root_dir); 522 goto out; 523 } 524 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 525 out: 526 gfs2_glock_dq_uninit(&sb_gh); 527 return ret; 528 } 529 530 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 531 { 532 char *message = "FIRSTMOUNT=Done"; 533 char *envp[] = { message, NULL }; 534 535 fs_info(sdp, "first mount done, others may mount\n"); 536 537 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 538 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 539 540 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 541 } 542 543 /** 544 * gfs2_jindex_hold - Grab a lock on the jindex 545 * @sdp: The GFS2 superblock 546 * @ji_gh: the holder for the jindex glock 547 * 548 * Returns: errno 549 */ 550 551 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 552 { 553 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 554 struct qstr name; 555 char buf[20]; 556 struct gfs2_jdesc *jd; 557 int error; 558 559 name.name = buf; 560 561 mutex_lock(&sdp->sd_jindex_mutex); 562 563 for (;;) { 564 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 565 if (error) 566 break; 567 568 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 569 name.hash = gfs2_disk_hash(name.name, name.len); 570 571 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 572 if (error == -ENOENT) { 573 error = 0; 574 break; 575 } 576 577 gfs2_glock_dq_uninit(ji_gh); 578 579 if (error) 580 break; 581 582 error = -ENOMEM; 583 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 584 if (!jd) 585 break; 586 587 INIT_LIST_HEAD(&jd->extent_list); 588 INIT_LIST_HEAD(&jd->jd_revoke_list); 589 590 INIT_WORK(&jd->jd_work, gfs2_recover_func); 591 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 592 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 593 if (!jd->jd_inode) 594 error = -ENOENT; 595 else 596 error = PTR_ERR(jd->jd_inode); 597 kfree(jd); 598 break; 599 } 600 601 spin_lock(&sdp->sd_jindex_spin); 602 jd->jd_jid = sdp->sd_journals++; 603 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 604 spin_unlock(&sdp->sd_jindex_spin); 605 } 606 607 mutex_unlock(&sdp->sd_jindex_mutex); 608 609 return error; 610 } 611 612 /** 613 * check_journal_clean - Make sure a journal is clean for a spectator mount 614 * @sdp: The GFS2 superblock 615 * @jd: The journal descriptor 616 * 617 * Returns: 0 if the journal is clean or locked, else an error 618 */ 619 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 620 { 621 int error; 622 struct gfs2_holder j_gh; 623 struct gfs2_log_header_host head; 624 struct gfs2_inode *ip; 625 626 ip = GFS2_I(jd->jd_inode); 627 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 628 GL_EXACT | GL_NOCACHE, &j_gh); 629 if (error) { 630 fs_err(sdp, "Error locking journal for spectator mount.\n"); 631 return -EPERM; 632 } 633 error = gfs2_jdesc_check(jd); 634 if (error) { 635 fs_err(sdp, "Error checking journal for spectator mount.\n"); 636 goto out_unlock; 637 } 638 error = gfs2_find_jhead(jd, &head); 639 if (error) { 640 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 641 goto out_unlock; 642 } 643 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 644 error = -EPERM; 645 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 646 "must not be a spectator.\n", jd->jd_jid); 647 } 648 649 out_unlock: 650 gfs2_glock_dq_uninit(&j_gh); 651 return error; 652 } 653 654 static int init_journal(struct gfs2_sbd *sdp, int undo) 655 { 656 struct inode *master = d_inode(sdp->sd_master_dir); 657 struct gfs2_holder ji_gh; 658 struct gfs2_inode *ip; 659 int jindex = 1; 660 int error = 0; 661 662 if (undo) { 663 jindex = 0; 664 goto fail_jinode_gh; 665 } 666 667 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 668 if (IS_ERR(sdp->sd_jindex)) { 669 fs_err(sdp, "can't lookup journal index: %d\n", error); 670 return PTR_ERR(sdp->sd_jindex); 671 } 672 673 /* Load in the journal index special file */ 674 675 error = gfs2_jindex_hold(sdp, &ji_gh); 676 if (error) { 677 fs_err(sdp, "can't read journal index: %d\n", error); 678 goto fail; 679 } 680 681 error = -EUSERS; 682 if (!gfs2_jindex_size(sdp)) { 683 fs_err(sdp, "no journals!\n"); 684 goto fail_jindex; 685 } 686 687 atomic_set(&sdp->sd_log_blks_needed, 0); 688 if (sdp->sd_args.ar_spectator) { 689 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 690 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 691 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 692 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 693 } else { 694 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 695 fs_err(sdp, "can't mount journal #%u\n", 696 sdp->sd_lockstruct.ls_jid); 697 fs_err(sdp, "there are only %u journals (0 - %u)\n", 698 gfs2_jindex_size(sdp), 699 gfs2_jindex_size(sdp) - 1); 700 goto fail_jindex; 701 } 702 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 703 704 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 705 &gfs2_journal_glops, 706 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 707 &sdp->sd_journal_gh); 708 if (error) { 709 fs_err(sdp, "can't acquire journal glock: %d\n", error); 710 goto fail_jindex; 711 } 712 713 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 714 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 715 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 716 &sdp->sd_jinode_gh); 717 if (error) { 718 fs_err(sdp, "can't acquire journal inode glock: %d\n", 719 error); 720 goto fail_journal_gh; 721 } 722 723 error = gfs2_jdesc_check(sdp->sd_jdesc); 724 if (error) { 725 fs_err(sdp, "my journal (%u) is bad: %d\n", 726 sdp->sd_jdesc->jd_jid, error); 727 goto fail_jinode_gh; 728 } 729 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 730 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 731 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 732 733 /* Map the extents for this journal's blocks */ 734 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 735 } 736 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 737 738 if (sdp->sd_lockstruct.ls_first) { 739 unsigned int x; 740 for (x = 0; x < sdp->sd_journals; x++) { 741 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 742 743 if (sdp->sd_args.ar_spectator) { 744 error = check_journal_clean(sdp, jd); 745 if (error) 746 goto fail_jinode_gh; 747 continue; 748 } 749 error = gfs2_recover_journal(jd, true); 750 if (error) { 751 fs_err(sdp, "error recovering journal %u: %d\n", 752 x, error); 753 goto fail_jinode_gh; 754 } 755 } 756 757 gfs2_others_may_mount(sdp); 758 } else if (!sdp->sd_args.ar_spectator) { 759 error = gfs2_recover_journal(sdp->sd_jdesc, true); 760 if (error) { 761 fs_err(sdp, "error recovering my journal: %d\n", error); 762 goto fail_jinode_gh; 763 } 764 } 765 766 sdp->sd_log_idle = 1; 767 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 768 gfs2_glock_dq_uninit(&ji_gh); 769 jindex = 0; 770 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 771 return 0; 772 773 fail_jinode_gh: 774 if (!sdp->sd_args.ar_spectator) 775 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 776 fail_journal_gh: 777 if (!sdp->sd_args.ar_spectator) 778 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 779 fail_jindex: 780 gfs2_jindex_free(sdp); 781 if (jindex) 782 gfs2_glock_dq_uninit(&ji_gh); 783 fail: 784 iput(sdp->sd_jindex); 785 return error; 786 } 787 788 static struct lock_class_key gfs2_quota_imutex_key; 789 790 static int init_inodes(struct gfs2_sbd *sdp, int undo) 791 { 792 int error = 0; 793 struct inode *master = d_inode(sdp->sd_master_dir); 794 795 if (undo) 796 goto fail_qinode; 797 798 error = init_journal(sdp, undo); 799 complete_all(&sdp->sd_journal_ready); 800 if (error) 801 goto fail; 802 803 /* Read in the master statfs inode */ 804 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 805 if (IS_ERR(sdp->sd_statfs_inode)) { 806 error = PTR_ERR(sdp->sd_statfs_inode); 807 fs_err(sdp, "can't read in statfs inode: %d\n", error); 808 goto fail_journal; 809 } 810 811 /* Read in the resource index inode */ 812 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 813 if (IS_ERR(sdp->sd_rindex)) { 814 error = PTR_ERR(sdp->sd_rindex); 815 fs_err(sdp, "can't get resource index inode: %d\n", error); 816 goto fail_statfs; 817 } 818 sdp->sd_rindex_uptodate = 0; 819 820 /* Read in the quota inode */ 821 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 822 if (IS_ERR(sdp->sd_quota_inode)) { 823 error = PTR_ERR(sdp->sd_quota_inode); 824 fs_err(sdp, "can't get quota file inode: %d\n", error); 825 goto fail_rindex; 826 } 827 /* 828 * i_mutex on quota files is special. Since this inode is hidden system 829 * file, we are safe to define locking ourselves. 830 */ 831 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 832 &gfs2_quota_imutex_key); 833 834 error = gfs2_rindex_update(sdp); 835 if (error) 836 goto fail_qinode; 837 838 return 0; 839 840 fail_qinode: 841 iput(sdp->sd_quota_inode); 842 fail_rindex: 843 gfs2_clear_rgrpd(sdp); 844 iput(sdp->sd_rindex); 845 fail_statfs: 846 iput(sdp->sd_statfs_inode); 847 fail_journal: 848 init_journal(sdp, UNDO); 849 fail: 850 return error; 851 } 852 853 static int init_per_node(struct gfs2_sbd *sdp, int undo) 854 { 855 struct inode *pn = NULL; 856 char buf[30]; 857 int error = 0; 858 struct gfs2_inode *ip; 859 struct inode *master = d_inode(sdp->sd_master_dir); 860 861 if (sdp->sd_args.ar_spectator) 862 return 0; 863 864 if (undo) 865 goto fail_qc_gh; 866 867 pn = gfs2_lookup_simple(master, "per_node"); 868 if (IS_ERR(pn)) { 869 error = PTR_ERR(pn); 870 fs_err(sdp, "can't find per_node directory: %d\n", error); 871 return error; 872 } 873 874 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 875 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 876 if (IS_ERR(sdp->sd_sc_inode)) { 877 error = PTR_ERR(sdp->sd_sc_inode); 878 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 879 goto fail; 880 } 881 882 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 883 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 884 if (IS_ERR(sdp->sd_qc_inode)) { 885 error = PTR_ERR(sdp->sd_qc_inode); 886 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 887 goto fail_ut_i; 888 } 889 890 iput(pn); 891 pn = NULL; 892 893 ip = GFS2_I(sdp->sd_sc_inode); 894 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 895 &sdp->sd_sc_gh); 896 if (error) { 897 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 898 goto fail_qc_i; 899 } 900 901 ip = GFS2_I(sdp->sd_qc_inode); 902 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 903 &sdp->sd_qc_gh); 904 if (error) { 905 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 906 goto fail_ut_gh; 907 } 908 909 return 0; 910 911 fail_qc_gh: 912 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 913 fail_ut_gh: 914 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 915 fail_qc_i: 916 iput(sdp->sd_qc_inode); 917 fail_ut_i: 918 iput(sdp->sd_sc_inode); 919 fail: 920 iput(pn); 921 return error; 922 } 923 924 static const match_table_t nolock_tokens = { 925 { Opt_jid, "jid=%d\n", }, 926 { Opt_err, NULL }, 927 }; 928 929 static const struct lm_lockops nolock_ops = { 930 .lm_proto_name = "lock_nolock", 931 .lm_put_lock = gfs2_glock_free, 932 .lm_tokens = &nolock_tokens, 933 }; 934 935 /** 936 * gfs2_lm_mount - mount a locking protocol 937 * @sdp: the filesystem 938 * @args: mount arguments 939 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 940 * 941 * Returns: errno 942 */ 943 944 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 945 { 946 const struct lm_lockops *lm; 947 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 948 struct gfs2_args *args = &sdp->sd_args; 949 const char *proto = sdp->sd_proto_name; 950 const char *table = sdp->sd_table_name; 951 char *o, *options; 952 int ret; 953 954 if (!strcmp("lock_nolock", proto)) { 955 lm = &nolock_ops; 956 sdp->sd_args.ar_localflocks = 1; 957 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 958 } else if (!strcmp("lock_dlm", proto)) { 959 lm = &gfs2_dlm_ops; 960 #endif 961 } else { 962 pr_info("can't find protocol %s\n", proto); 963 return -ENOENT; 964 } 965 966 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 967 968 ls->ls_ops = lm; 969 ls->ls_first = 1; 970 971 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 972 substring_t tmp[MAX_OPT_ARGS]; 973 int token, option; 974 975 if (!o || !*o) 976 continue; 977 978 token = match_token(o, *lm->lm_tokens, tmp); 979 switch (token) { 980 case Opt_jid: 981 ret = match_int(&tmp[0], &option); 982 if (ret || option < 0) 983 goto hostdata_error; 984 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 985 ls->ls_jid = option; 986 break; 987 case Opt_id: 988 case Opt_nodir: 989 /* Obsolete, but left for backward compat purposes */ 990 break; 991 case Opt_first: 992 ret = match_int(&tmp[0], &option); 993 if (ret || (option != 0 && option != 1)) 994 goto hostdata_error; 995 ls->ls_first = option; 996 break; 997 case Opt_err: 998 default: 999 hostdata_error: 1000 fs_info(sdp, "unknown hostdata (%s)\n", o); 1001 return -EINVAL; 1002 } 1003 } 1004 1005 if (lm->lm_mount == NULL) { 1006 fs_info(sdp, "Now mounting FS...\n"); 1007 complete_all(&sdp->sd_locking_init); 1008 return 0; 1009 } 1010 ret = lm->lm_mount(sdp, table); 1011 if (ret == 0) 1012 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1013 complete_all(&sdp->sd_locking_init); 1014 return ret; 1015 } 1016 1017 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1018 { 1019 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1020 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1021 lm->lm_unmount) 1022 lm->lm_unmount(sdp); 1023 } 1024 1025 static int wait_on_journal(struct gfs2_sbd *sdp) 1026 { 1027 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1028 return 0; 1029 1030 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1031 ? -EINTR : 0; 1032 } 1033 1034 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1035 { 1036 struct super_block *sb = sdp->sd_vfs; 1037 char ro[20]; 1038 char spectator[20]; 1039 char *envp[] = { ro, spectator, NULL }; 1040 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1041 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1042 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1043 } 1044 1045 /** 1046 * fill_super - Read in superblock 1047 * @sb: The VFS superblock 1048 * @data: Mount options 1049 * @silent: Don't complain if it's not a GFS2 filesystem 1050 * 1051 * Returns: errno 1052 */ 1053 1054 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1055 { 1056 struct gfs2_sbd *sdp; 1057 struct gfs2_holder mount_gh; 1058 int error; 1059 1060 sdp = init_sbd(sb); 1061 if (!sdp) { 1062 pr_warn("can't alloc struct gfs2_sbd\n"); 1063 return -ENOMEM; 1064 } 1065 sdp->sd_args = *args; 1066 1067 if (sdp->sd_args.ar_spectator) { 1068 sb->s_flags |= MS_RDONLY; 1069 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1070 } 1071 if (sdp->sd_args.ar_posix_acl) 1072 sb->s_flags |= MS_POSIXACL; 1073 if (sdp->sd_args.ar_nobarrier) 1074 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1075 1076 sb->s_flags |= MS_NOSEC; 1077 sb->s_magic = GFS2_MAGIC; 1078 sb->s_op = &gfs2_super_ops; 1079 sb->s_d_op = &gfs2_dops; 1080 sb->s_export_op = &gfs2_export_ops; 1081 sb->s_xattr = gfs2_xattr_handlers; 1082 sb->s_qcop = &gfs2_quotactl_ops; 1083 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1084 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1085 sb->s_time_gran = 1; 1086 sb->s_maxbytes = MAX_LFS_FILESIZE; 1087 1088 /* Set up the buffer cache and fill in some fake block size values 1089 to allow us to read-in the on-disk superblock. */ 1090 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1091 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1092 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1093 GFS2_BASIC_BLOCK_SHIFT; 1094 sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift); 1095 1096 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1097 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1098 if (sdp->sd_args.ar_statfs_quantum) { 1099 sdp->sd_tune.gt_statfs_slow = 0; 1100 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1101 } else { 1102 sdp->sd_tune.gt_statfs_slow = 1; 1103 sdp->sd_tune.gt_statfs_quantum = 30; 1104 } 1105 1106 error = init_names(sdp, silent); 1107 if (error) { 1108 /* In this case, we haven't initialized sysfs, so we have to 1109 manually free the sdp. */ 1110 free_percpu(sdp->sd_lkstats); 1111 kfree(sdp); 1112 sb->s_fs_info = NULL; 1113 return error; 1114 } 1115 1116 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); 1117 1118 error = gfs2_sys_fs_add(sdp); 1119 /* 1120 * If we hit an error here, gfs2_sys_fs_add will have called function 1121 * kobject_put which causes the sysfs usage count to go to zero, which 1122 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1123 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1124 * kobject_put to free sdp. 1125 */ 1126 if (error) 1127 return error; 1128 1129 gfs2_create_debugfs_file(sdp); 1130 1131 error = gfs2_lm_mount(sdp, silent); 1132 if (error) 1133 goto fail_debug; 1134 1135 error = init_locking(sdp, &mount_gh, DO); 1136 if (error) 1137 goto fail_lm; 1138 1139 error = init_sb(sdp, silent); 1140 if (error) 1141 goto fail_locking; 1142 1143 error = wait_on_journal(sdp); 1144 if (error) 1145 goto fail_sb; 1146 1147 /* 1148 * If user space has failed to join the cluster or some similar 1149 * failure has occurred, then the journal id will contain a 1150 * negative (error) number. This will then be returned to the 1151 * caller (of the mount syscall). We do this even for spectator 1152 * mounts (which just write a jid of 0 to indicate "ok" even though 1153 * the jid is unused in the spectator case) 1154 */ 1155 if (sdp->sd_lockstruct.ls_jid < 0) { 1156 error = sdp->sd_lockstruct.ls_jid; 1157 sdp->sd_lockstruct.ls_jid = 0; 1158 goto fail_sb; 1159 } 1160 1161 if (sdp->sd_args.ar_spectator) 1162 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", 1163 sdp->sd_table_name); 1164 else 1165 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", 1166 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1167 1168 error = init_inodes(sdp, DO); 1169 if (error) 1170 goto fail_sb; 1171 1172 error = init_per_node(sdp, DO); 1173 if (error) 1174 goto fail_inodes; 1175 1176 error = gfs2_statfs_init(sdp); 1177 if (error) { 1178 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1179 goto fail_per_node; 1180 } 1181 1182 if (!(sb->s_flags & MS_RDONLY)) { 1183 error = gfs2_make_fs_rw(sdp); 1184 if (error) { 1185 fs_err(sdp, "can't make FS RW: %d\n", error); 1186 goto fail_per_node; 1187 } 1188 } 1189 1190 gfs2_glock_dq_uninit(&mount_gh); 1191 gfs2_online_uevent(sdp); 1192 return 0; 1193 1194 fail_per_node: 1195 init_per_node(sdp, UNDO); 1196 fail_inodes: 1197 init_inodes(sdp, UNDO); 1198 fail_sb: 1199 if (sdp->sd_root_dir) 1200 dput(sdp->sd_root_dir); 1201 if (sdp->sd_master_dir) 1202 dput(sdp->sd_master_dir); 1203 if (sb->s_root) 1204 dput(sb->s_root); 1205 sb->s_root = NULL; 1206 fail_locking: 1207 init_locking(sdp, &mount_gh, UNDO); 1208 fail_lm: 1209 complete_all(&sdp->sd_journal_ready); 1210 gfs2_gl_hash_clear(sdp); 1211 gfs2_lm_unmount(sdp); 1212 fail_debug: 1213 gfs2_delete_debugfs_file(sdp); 1214 free_percpu(sdp->sd_lkstats); 1215 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1216 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1217 gfs2_sys_fs_del(sdp); 1218 sb->s_fs_info = NULL; 1219 return error; 1220 } 1221 1222 static int set_gfs2_super(struct super_block *s, void *data) 1223 { 1224 s->s_bdev = data; 1225 s->s_dev = s->s_bdev->bd_dev; 1226 s->s_bdi = bdi_get(s->s_bdev->bd_bdi); 1227 return 0; 1228 } 1229 1230 static int test_gfs2_super(struct super_block *s, void *ptr) 1231 { 1232 struct block_device *bdev = ptr; 1233 return (bdev == s->s_bdev); 1234 } 1235 1236 /** 1237 * gfs2_mount - Get the GFS2 superblock 1238 * @fs_type: The GFS2 filesystem type 1239 * @flags: Mount flags 1240 * @dev_name: The name of the device 1241 * @data: The mount arguments 1242 * 1243 * Q. Why not use get_sb_bdev() ? 1244 * A. We need to select one of two root directories to mount, independent 1245 * of whether this is the initial, or subsequent, mount of this sb 1246 * 1247 * Returns: 0 or -ve on error 1248 */ 1249 1250 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1251 const char *dev_name, void *data) 1252 { 1253 struct block_device *bdev; 1254 struct super_block *s; 1255 fmode_t mode = FMODE_READ | FMODE_EXCL; 1256 int error; 1257 struct gfs2_args args; 1258 struct gfs2_sbd *sdp; 1259 1260 if (!(flags & MS_RDONLY)) 1261 mode |= FMODE_WRITE; 1262 1263 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1264 if (IS_ERR(bdev)) 1265 return ERR_CAST(bdev); 1266 1267 /* 1268 * once the super is inserted into the list by sget, s_umount 1269 * will protect the lockfs code from trying to start a snapshot 1270 * while we are mounting 1271 */ 1272 mutex_lock(&bdev->bd_fsfreeze_mutex); 1273 if (bdev->bd_fsfreeze_count > 0) { 1274 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1275 error = -EBUSY; 1276 goto error_bdev; 1277 } 1278 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1279 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1280 error = PTR_ERR(s); 1281 if (IS_ERR(s)) 1282 goto error_bdev; 1283 1284 if (s->s_root) { 1285 /* 1286 * s_umount nests inside bd_mutex during 1287 * __invalidate_device(). blkdev_put() acquires 1288 * bd_mutex and can't be called under s_umount. Drop 1289 * s_umount temporarily. This is safe as we're 1290 * holding an active reference. 1291 */ 1292 up_write(&s->s_umount); 1293 blkdev_put(bdev, mode); 1294 down_write(&s->s_umount); 1295 } else { 1296 /* s_mode must be set before deactivate_locked_super calls */ 1297 s->s_mode = mode; 1298 } 1299 1300 memset(&args, 0, sizeof(args)); 1301 args.ar_quota = GFS2_QUOTA_DEFAULT; 1302 args.ar_data = GFS2_DATA_DEFAULT; 1303 args.ar_commit = 30; 1304 args.ar_statfs_quantum = 30; 1305 args.ar_quota_quantum = 60; 1306 args.ar_errors = GFS2_ERRORS_DEFAULT; 1307 1308 error = gfs2_mount_args(&args, data); 1309 if (error) { 1310 pr_warn("can't parse mount arguments\n"); 1311 goto error_super; 1312 } 1313 1314 if (s->s_root) { 1315 error = -EBUSY; 1316 if ((flags ^ s->s_flags) & MS_RDONLY) 1317 goto error_super; 1318 } else { 1319 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1320 sb_set_blocksize(s, block_size(bdev)); 1321 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1322 if (error) 1323 goto error_super; 1324 s->s_flags |= MS_ACTIVE; 1325 bdev->bd_super = s; 1326 } 1327 1328 sdp = s->s_fs_info; 1329 if (args.ar_meta) 1330 return dget(sdp->sd_master_dir); 1331 else 1332 return dget(sdp->sd_root_dir); 1333 1334 error_super: 1335 deactivate_locked_super(s); 1336 return ERR_PTR(error); 1337 error_bdev: 1338 blkdev_put(bdev, mode); 1339 return ERR_PTR(error); 1340 } 1341 1342 static int set_meta_super(struct super_block *s, void *ptr) 1343 { 1344 return -EINVAL; 1345 } 1346 1347 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1348 int flags, const char *dev_name, void *data) 1349 { 1350 struct super_block *s; 1351 struct gfs2_sbd *sdp; 1352 struct path path; 1353 int error; 1354 1355 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1356 if (error) { 1357 pr_warn("path_lookup on %s returned error %d\n", 1358 dev_name, error); 1359 return ERR_PTR(error); 1360 } 1361 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1362 path.dentry->d_sb->s_bdev); 1363 path_put(&path); 1364 if (IS_ERR(s)) { 1365 pr_warn("gfs2 mount does not exist\n"); 1366 return ERR_CAST(s); 1367 } 1368 if ((flags ^ s->s_flags) & MS_RDONLY) { 1369 deactivate_locked_super(s); 1370 return ERR_PTR(-EBUSY); 1371 } 1372 sdp = s->s_fs_info; 1373 return dget(sdp->sd_master_dir); 1374 } 1375 1376 static void gfs2_kill_sb(struct super_block *sb) 1377 { 1378 struct gfs2_sbd *sdp = sb->s_fs_info; 1379 1380 if (sdp == NULL) { 1381 kill_block_super(sb); 1382 return; 1383 } 1384 1385 gfs2_log_flush(sdp, NULL, SYNC_FLUSH); 1386 dput(sdp->sd_root_dir); 1387 dput(sdp->sd_master_dir); 1388 sdp->sd_root_dir = NULL; 1389 sdp->sd_master_dir = NULL; 1390 shrink_dcache_sb(sb); 1391 gfs2_delete_debugfs_file(sdp); 1392 free_percpu(sdp->sd_lkstats); 1393 kill_block_super(sb); 1394 } 1395 1396 struct file_system_type gfs2_fs_type = { 1397 .name = "gfs2", 1398 .fs_flags = FS_REQUIRES_DEV, 1399 .mount = gfs2_mount, 1400 .kill_sb = gfs2_kill_sb, 1401 .owner = THIS_MODULE, 1402 }; 1403 MODULE_ALIAS_FS("gfs2"); 1404 1405 struct file_system_type gfs2meta_fs_type = { 1406 .name = "gfs2meta", 1407 .fs_flags = FS_REQUIRES_DEV, 1408 .mount = gfs2_mount_meta, 1409 .owner = THIS_MODULE, 1410 }; 1411 MODULE_ALIAS_FS("gfs2meta"); 1412