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 27 #include "gfs2.h" 28 #include "incore.h" 29 #include "bmap.h" 30 #include "glock.h" 31 #include "glops.h" 32 #include "inode.h" 33 #include "recovery.h" 34 #include "rgrp.h" 35 #include "super.h" 36 #include "sys.h" 37 #include "util.h" 38 #include "log.h" 39 #include "quota.h" 40 #include "dir.h" 41 #include "meta_io.h" 42 #include "trace_gfs2.h" 43 44 #define DO 0 45 #define UNDO 1 46 47 /** 48 * gfs2_tune_init - Fill a gfs2_tune structure with default values 49 * @gt: tune 50 * 51 */ 52 53 static void gfs2_tune_init(struct gfs2_tune *gt) 54 { 55 spin_lock_init(>->gt_spin); 56 57 gt->gt_quota_warn_period = 10; 58 gt->gt_quota_scale_num = 1; 59 gt->gt_quota_scale_den = 1; 60 gt->gt_new_files_jdata = 0; 61 gt->gt_max_readahead = 1 << 18; 62 gt->gt_complain_secs = 10; 63 } 64 65 static struct gfs2_sbd *init_sbd(struct super_block *sb) 66 { 67 struct gfs2_sbd *sdp; 68 struct address_space *mapping; 69 70 sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL); 71 if (!sdp) 72 return NULL; 73 74 sb->s_fs_info = sdp; 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 82 set_bit(SDF_NOJOURNALID, &sdp->sd_flags); 83 gfs2_tune_init(&sdp->sd_tune); 84 85 init_waitqueue_head(&sdp->sd_glock_wait); 86 atomic_set(&sdp->sd_glock_disposal, 0); 87 init_completion(&sdp->sd_locking_init); 88 init_completion(&sdp->sd_wdack); 89 spin_lock_init(&sdp->sd_statfs_spin); 90 91 spin_lock_init(&sdp->sd_rindex_spin); 92 sdp->sd_rindex_tree.rb_node = NULL; 93 94 INIT_LIST_HEAD(&sdp->sd_jindex_list); 95 spin_lock_init(&sdp->sd_jindex_spin); 96 mutex_init(&sdp->sd_jindex_mutex); 97 init_completion(&sdp->sd_journal_ready); 98 99 INIT_LIST_HEAD(&sdp->sd_quota_list); 100 mutex_init(&sdp->sd_quota_mutex); 101 mutex_init(&sdp->sd_quota_sync_mutex); 102 init_waitqueue_head(&sdp->sd_quota_wait); 103 INIT_LIST_HEAD(&sdp->sd_trunc_list); 104 spin_lock_init(&sdp->sd_trunc_lock); 105 spin_lock_init(&sdp->sd_bitmap_lock); 106 107 mapping = &sdp->sd_aspace; 108 109 address_space_init_once(mapping); 110 mapping->a_ops = &gfs2_rgrp_aops; 111 mapping->host = sb->s_bdev->bd_inode; 112 mapping->flags = 0; 113 mapping_set_gfp_mask(mapping, GFP_NOFS); 114 mapping->private_data = NULL; 115 mapping->writeback_index = 0; 116 117 spin_lock_init(&sdp->sd_log_lock); 118 atomic_set(&sdp->sd_log_pinned, 0); 119 INIT_LIST_HEAD(&sdp->sd_log_le_revoke); 120 INIT_LIST_HEAD(&sdp->sd_log_le_ordered); 121 spin_lock_init(&sdp->sd_ordered_lock); 122 123 init_waitqueue_head(&sdp->sd_log_waitq); 124 init_waitqueue_head(&sdp->sd_logd_waitq); 125 spin_lock_init(&sdp->sd_ail_lock); 126 INIT_LIST_HEAD(&sdp->sd_ail1_list); 127 INIT_LIST_HEAD(&sdp->sd_ail2_list); 128 129 init_rwsem(&sdp->sd_log_flush_lock); 130 atomic_set(&sdp->sd_log_in_flight, 0); 131 atomic_set(&sdp->sd_reserving_log, 0); 132 init_waitqueue_head(&sdp->sd_reserving_log_wait); 133 init_waitqueue_head(&sdp->sd_log_flush_wait); 134 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN); 135 mutex_init(&sdp->sd_freeze_mutex); 136 137 return sdp; 138 } 139 140 141 /** 142 * gfs2_check_sb - Check superblock 143 * @sdp: the filesystem 144 * @sb: The superblock 145 * @silent: Don't print a message if the check fails 146 * 147 * Checks the version code of the FS is one that we understand how to 148 * read and that the sizes of the various on-disk structures have not 149 * changed. 150 */ 151 152 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent) 153 { 154 struct gfs2_sb_host *sb = &sdp->sd_sb; 155 156 if (sb->sb_magic != GFS2_MAGIC || 157 sb->sb_type != GFS2_METATYPE_SB) { 158 if (!silent) 159 pr_warn("not a GFS2 filesystem\n"); 160 return -EINVAL; 161 } 162 163 /* If format numbers match exactly, we're done. */ 164 165 if (sb->sb_fs_format == GFS2_FORMAT_FS && 166 sb->sb_multihost_format == GFS2_FORMAT_MULTI) 167 return 0; 168 169 fs_warn(sdp, "Unknown on-disk format, unable to mount\n"); 170 171 return -EINVAL; 172 } 173 174 static void end_bio_io_page(struct bio *bio) 175 { 176 struct page *page = bio->bi_private; 177 178 if (!bio->bi_error) 179 SetPageUptodate(page); 180 else 181 pr_warn("error %d reading superblock\n", bio->bi_error); 182 unlock_page(page); 183 } 184 185 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf) 186 { 187 struct gfs2_sb_host *sb = &sdp->sd_sb; 188 struct super_block *s = sdp->sd_vfs; 189 const struct gfs2_sb *str = buf; 190 191 sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic); 192 sb->sb_type = be32_to_cpu(str->sb_header.mh_type); 193 sb->sb_format = be32_to_cpu(str->sb_header.mh_format); 194 sb->sb_fs_format = be32_to_cpu(str->sb_fs_format); 195 sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format); 196 sb->sb_bsize = be32_to_cpu(str->sb_bsize); 197 sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift); 198 sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr); 199 sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino); 200 sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr); 201 sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino); 202 203 memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN); 204 memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN); 205 memcpy(s->s_uuid, str->sb_uuid, 16); 206 } 207 208 /** 209 * gfs2_read_super - Read the gfs2 super block from disk 210 * @sdp: The GFS2 super block 211 * @sector: The location of the super block 212 * @error: The error code to return 213 * 214 * This uses the bio functions to read the super block from disk 215 * because we want to be 100% sure that we never read cached data. 216 * A super block is read twice only during each GFS2 mount and is 217 * never written to by the filesystem. The first time its read no 218 * locks are held, and the only details which are looked at are those 219 * relating to the locking protocol. Once locking is up and working, 220 * the sb is read again under the lock to establish the location of 221 * the master directory (contains pointers to journals etc) and the 222 * root directory. 223 * 224 * Returns: 0 on success or error 225 */ 226 227 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent) 228 { 229 struct super_block *sb = sdp->sd_vfs; 230 struct gfs2_sb *p; 231 struct page *page; 232 struct bio *bio; 233 234 page = alloc_page(GFP_NOFS); 235 if (unlikely(!page)) 236 return -ENOMEM; 237 238 ClearPageUptodate(page); 239 ClearPageDirty(page); 240 lock_page(page); 241 242 bio = bio_alloc(GFP_NOFS, 1); 243 bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9); 244 bio->bi_bdev = sb->s_bdev; 245 bio_add_page(bio, page, PAGE_SIZE, 0); 246 247 bio->bi_end_io = end_bio_io_page; 248 bio->bi_private = page; 249 submit_bio(READ_SYNC | REQ_META, bio); 250 wait_on_page_locked(page); 251 bio_put(bio); 252 if (!PageUptodate(page)) { 253 __free_page(page); 254 return -EIO; 255 } 256 p = kmap(page); 257 gfs2_sb_in(sdp, p); 258 kunmap(page); 259 __free_page(page); 260 return gfs2_check_sb(sdp, silent); 261 } 262 263 /** 264 * gfs2_read_sb - Read super block 265 * @sdp: The GFS2 superblock 266 * @silent: Don't print message if mount fails 267 * 268 */ 269 270 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent) 271 { 272 u32 hash_blocks, ind_blocks, leaf_blocks; 273 u32 tmp_blocks; 274 unsigned int x; 275 int error; 276 277 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 278 if (error) { 279 if (!silent) 280 fs_err(sdp, "can't read superblock\n"); 281 return error; 282 } 283 284 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 285 GFS2_BASIC_BLOCK_SHIFT; 286 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 287 sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - 288 sizeof(struct gfs2_dinode)) / sizeof(u64); 289 sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - 290 sizeof(struct gfs2_meta_header)) / sizeof(u64); 291 sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); 292 sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; 293 sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; 294 sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64); 295 sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - 296 sizeof(struct gfs2_meta_header)) / 297 sizeof(struct gfs2_quota_change); 298 sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize - 299 sizeof(struct gfs2_meta_header)) 300 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */ 301 302 /* Compute maximum reservation required to add a entry to a directory */ 303 304 hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH), 305 sdp->sd_jbsize); 306 307 ind_blocks = 0; 308 for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { 309 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); 310 ind_blocks += tmp_blocks; 311 } 312 313 leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; 314 315 sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; 316 317 sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - 318 sizeof(struct gfs2_dinode); 319 sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; 320 for (x = 2;; x++) { 321 u64 space, d; 322 u32 m; 323 324 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; 325 d = space; 326 m = do_div(d, sdp->sd_inptrs); 327 328 if (d != sdp->sd_heightsize[x - 1] || m) 329 break; 330 sdp->sd_heightsize[x] = space; 331 } 332 sdp->sd_max_height = x; 333 sdp->sd_heightsize[x] = ~0; 334 gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); 335 336 sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - 337 sizeof(struct gfs2_dinode); 338 sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; 339 for (x = 2;; x++) { 340 u64 space, d; 341 u32 m; 342 343 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; 344 d = space; 345 m = do_div(d, sdp->sd_inptrs); 346 347 if (d != sdp->sd_jheightsize[x - 1] || m) 348 break; 349 sdp->sd_jheightsize[x] = space; 350 } 351 sdp->sd_max_jheight = x; 352 sdp->sd_jheightsize[x] = ~0; 353 gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); 354 355 sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize - 356 sizeof(struct gfs2_leaf)) / 357 GFS2_MIN_DIRENT_SIZE; 358 return 0; 359 } 360 361 static int init_names(struct gfs2_sbd *sdp, int silent) 362 { 363 char *proto, *table; 364 int error = 0; 365 366 proto = sdp->sd_args.ar_lockproto; 367 table = sdp->sd_args.ar_locktable; 368 369 /* Try to autodetect */ 370 371 if (!proto[0] || !table[0]) { 372 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent); 373 if (error) 374 return error; 375 376 if (!proto[0]) 377 proto = sdp->sd_sb.sb_lockproto; 378 if (!table[0]) 379 table = sdp->sd_sb.sb_locktable; 380 } 381 382 if (!table[0]) 383 table = sdp->sd_vfs->s_id; 384 385 strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN); 386 strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN); 387 388 table = sdp->sd_table_name; 389 while ((table = strchr(table, '/'))) 390 *table = '_'; 391 392 return error; 393 } 394 395 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh, 396 int undo) 397 { 398 int error = 0; 399 400 if (undo) 401 goto fail_trans; 402 403 error = gfs2_glock_nq_num(sdp, 404 GFS2_MOUNT_LOCK, &gfs2_nondisk_glops, 405 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE, 406 mount_gh); 407 if (error) { 408 fs_err(sdp, "can't acquire mount glock: %d\n", error); 409 goto fail; 410 } 411 412 error = gfs2_glock_nq_num(sdp, 413 GFS2_LIVE_LOCK, &gfs2_nondisk_glops, 414 LM_ST_SHARED, 415 LM_FLAG_NOEXP | GL_EXACT, 416 &sdp->sd_live_gh); 417 if (error) { 418 fs_err(sdp, "can't acquire live glock: %d\n", error); 419 goto fail_mount; 420 } 421 422 error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops, 423 CREATE, &sdp->sd_rename_gl); 424 if (error) { 425 fs_err(sdp, "can't create rename glock: %d\n", error); 426 goto fail_live; 427 } 428 429 error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops, 430 CREATE, &sdp->sd_freeze_gl); 431 if (error) { 432 fs_err(sdp, "can't create transaction glock: %d\n", error); 433 goto fail_rename; 434 } 435 436 return 0; 437 438 fail_trans: 439 gfs2_glock_put(sdp->sd_freeze_gl); 440 fail_rename: 441 gfs2_glock_put(sdp->sd_rename_gl); 442 fail_live: 443 gfs2_glock_dq_uninit(&sdp->sd_live_gh); 444 fail_mount: 445 gfs2_glock_dq_uninit(mount_gh); 446 fail: 447 return error; 448 } 449 450 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr, 451 u64 no_addr, const char *name) 452 { 453 struct gfs2_sbd *sdp = sb->s_fs_info; 454 struct dentry *dentry; 455 struct inode *inode; 456 457 inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0); 458 if (IS_ERR(inode)) { 459 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode)); 460 return PTR_ERR(inode); 461 } 462 dentry = d_make_root(inode); 463 if (!dentry) { 464 fs_err(sdp, "can't alloc %s dentry\n", name); 465 return -ENOMEM; 466 } 467 *dptr = dentry; 468 return 0; 469 } 470 471 static int init_sb(struct gfs2_sbd *sdp, int silent) 472 { 473 struct super_block *sb = sdp->sd_vfs; 474 struct gfs2_holder sb_gh; 475 u64 no_addr; 476 int ret; 477 478 ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops, 479 LM_ST_SHARED, 0, &sb_gh); 480 if (ret) { 481 fs_err(sdp, "can't acquire superblock glock: %d\n", ret); 482 return ret; 483 } 484 485 ret = gfs2_read_sb(sdp, silent); 486 if (ret) { 487 fs_err(sdp, "can't read superblock: %d\n", ret); 488 goto out; 489 } 490 491 /* Set up the buffer cache and SB for real */ 492 if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) { 493 ret = -EINVAL; 494 fs_err(sdp, "FS block size (%u) is too small for device " 495 "block size (%u)\n", 496 sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev)); 497 goto out; 498 } 499 if (sdp->sd_sb.sb_bsize > PAGE_SIZE) { 500 ret = -EINVAL; 501 fs_err(sdp, "FS block size (%u) is too big for machine " 502 "page size (%u)\n", 503 sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE); 504 goto out; 505 } 506 sb_set_blocksize(sb, sdp->sd_sb.sb_bsize); 507 508 /* Get the root inode */ 509 no_addr = sdp->sd_sb.sb_root_dir.no_addr; 510 ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root"); 511 if (ret) 512 goto out; 513 514 /* Get the master inode */ 515 no_addr = sdp->sd_sb.sb_master_dir.no_addr; 516 ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master"); 517 if (ret) { 518 dput(sdp->sd_root_dir); 519 goto out; 520 } 521 sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir); 522 out: 523 gfs2_glock_dq_uninit(&sb_gh); 524 return ret; 525 } 526 527 static void gfs2_others_may_mount(struct gfs2_sbd *sdp) 528 { 529 char *message = "FIRSTMOUNT=Done"; 530 char *envp[] = { message, NULL }; 531 532 fs_info(sdp, "first mount done, others may mount\n"); 533 534 if (sdp->sd_lockstruct.ls_ops->lm_first_done) 535 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp); 536 537 kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp); 538 } 539 540 /** 541 * gfs2_jindex_hold - Grab a lock on the jindex 542 * @sdp: The GFS2 superblock 543 * @ji_gh: the holder for the jindex glock 544 * 545 * Returns: errno 546 */ 547 548 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) 549 { 550 struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); 551 struct qstr name; 552 char buf[20]; 553 struct gfs2_jdesc *jd; 554 int error; 555 556 name.name = buf; 557 558 mutex_lock(&sdp->sd_jindex_mutex); 559 560 for (;;) { 561 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); 562 if (error) 563 break; 564 565 name.len = sprintf(buf, "journal%u", sdp->sd_journals); 566 name.hash = gfs2_disk_hash(name.name, name.len); 567 568 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); 569 if (error == -ENOENT) { 570 error = 0; 571 break; 572 } 573 574 gfs2_glock_dq_uninit(ji_gh); 575 576 if (error) 577 break; 578 579 error = -ENOMEM; 580 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); 581 if (!jd) 582 break; 583 584 INIT_LIST_HEAD(&jd->extent_list); 585 INIT_LIST_HEAD(&jd->jd_revoke_list); 586 587 INIT_WORK(&jd->jd_work, gfs2_recover_func); 588 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); 589 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { 590 if (!jd->jd_inode) 591 error = -ENOENT; 592 else 593 error = PTR_ERR(jd->jd_inode); 594 kfree(jd); 595 break; 596 } 597 598 spin_lock(&sdp->sd_jindex_spin); 599 jd->jd_jid = sdp->sd_journals++; 600 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); 601 spin_unlock(&sdp->sd_jindex_spin); 602 } 603 604 mutex_unlock(&sdp->sd_jindex_mutex); 605 606 return error; 607 } 608 609 /** 610 * check_journal_clean - Make sure a journal is clean for a spectator mount 611 * @sdp: The GFS2 superblock 612 * @jd: The journal descriptor 613 * 614 * Returns: 0 if the journal is clean or locked, else an error 615 */ 616 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd) 617 { 618 int error; 619 struct gfs2_holder j_gh; 620 struct gfs2_log_header_host head; 621 struct gfs2_inode *ip; 622 623 ip = GFS2_I(jd->jd_inode); 624 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP | 625 GL_EXACT | GL_NOCACHE, &j_gh); 626 if (error) { 627 fs_err(sdp, "Error locking journal for spectator mount.\n"); 628 return -EPERM; 629 } 630 error = gfs2_jdesc_check(jd); 631 if (error) { 632 fs_err(sdp, "Error checking journal for spectator mount.\n"); 633 goto out_unlock; 634 } 635 error = gfs2_find_jhead(jd, &head); 636 if (error) { 637 fs_err(sdp, "Error parsing journal for spectator mount.\n"); 638 goto out_unlock; 639 } 640 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { 641 error = -EPERM; 642 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter " 643 "must not be a spectator.\n", jd->jd_jid); 644 } 645 646 out_unlock: 647 gfs2_glock_dq_uninit(&j_gh); 648 return error; 649 } 650 651 static int init_journal(struct gfs2_sbd *sdp, int undo) 652 { 653 struct inode *master = d_inode(sdp->sd_master_dir); 654 struct gfs2_holder ji_gh; 655 struct gfs2_inode *ip; 656 int jindex = 1; 657 int error = 0; 658 659 if (undo) { 660 jindex = 0; 661 goto fail_jinode_gh; 662 } 663 664 sdp->sd_jindex = gfs2_lookup_simple(master, "jindex"); 665 if (IS_ERR(sdp->sd_jindex)) { 666 fs_err(sdp, "can't lookup journal index: %d\n", error); 667 return PTR_ERR(sdp->sd_jindex); 668 } 669 670 /* Load in the journal index special file */ 671 672 error = gfs2_jindex_hold(sdp, &ji_gh); 673 if (error) { 674 fs_err(sdp, "can't read journal index: %d\n", error); 675 goto fail; 676 } 677 678 error = -EUSERS; 679 if (!gfs2_jindex_size(sdp)) { 680 fs_err(sdp, "no journals!\n"); 681 goto fail_jindex; 682 } 683 684 if (sdp->sd_args.ar_spectator) { 685 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0); 686 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 687 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 688 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 689 } else { 690 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) { 691 fs_err(sdp, "can't mount journal #%u\n", 692 sdp->sd_lockstruct.ls_jid); 693 fs_err(sdp, "there are only %u journals (0 - %u)\n", 694 gfs2_jindex_size(sdp), 695 gfs2_jindex_size(sdp) - 1); 696 goto fail_jindex; 697 } 698 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid); 699 700 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid, 701 &gfs2_journal_glops, 702 LM_ST_EXCLUSIVE, LM_FLAG_NOEXP, 703 &sdp->sd_journal_gh); 704 if (error) { 705 fs_err(sdp, "can't acquire journal glock: %d\n", error); 706 goto fail_jindex; 707 } 708 709 ip = GFS2_I(sdp->sd_jdesc->jd_inode); 710 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 711 LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE, 712 &sdp->sd_jinode_gh); 713 if (error) { 714 fs_err(sdp, "can't acquire journal inode glock: %d\n", 715 error); 716 goto fail_journal_gh; 717 } 718 719 error = gfs2_jdesc_check(sdp->sd_jdesc); 720 if (error) { 721 fs_err(sdp, "my journal (%u) is bad: %d\n", 722 sdp->sd_jdesc->jd_jid, error); 723 goto fail_jinode_gh; 724 } 725 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks); 726 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5); 727 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5); 728 729 /* Map the extents for this journal's blocks */ 730 gfs2_map_journal_extents(sdp, sdp->sd_jdesc); 731 } 732 trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free)); 733 734 if (sdp->sd_lockstruct.ls_first) { 735 unsigned int x; 736 for (x = 0; x < sdp->sd_journals; x++) { 737 struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x); 738 739 if (sdp->sd_args.ar_spectator) { 740 error = check_journal_clean(sdp, jd); 741 if (error) 742 goto fail_jinode_gh; 743 continue; 744 } 745 error = gfs2_recover_journal(jd, true); 746 if (error) { 747 fs_err(sdp, "error recovering journal %u: %d\n", 748 x, error); 749 goto fail_jinode_gh; 750 } 751 } 752 753 gfs2_others_may_mount(sdp); 754 } else if (!sdp->sd_args.ar_spectator) { 755 error = gfs2_recover_journal(sdp->sd_jdesc, true); 756 if (error) { 757 fs_err(sdp, "error recovering my journal: %d\n", error); 758 goto fail_jinode_gh; 759 } 760 } 761 762 sdp->sd_log_idle = 1; 763 set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags); 764 gfs2_glock_dq_uninit(&ji_gh); 765 jindex = 0; 766 INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func); 767 return 0; 768 769 fail_jinode_gh: 770 if (!sdp->sd_args.ar_spectator) 771 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); 772 fail_journal_gh: 773 if (!sdp->sd_args.ar_spectator) 774 gfs2_glock_dq_uninit(&sdp->sd_journal_gh); 775 fail_jindex: 776 gfs2_jindex_free(sdp); 777 if (jindex) 778 gfs2_glock_dq_uninit(&ji_gh); 779 fail: 780 iput(sdp->sd_jindex); 781 return error; 782 } 783 784 static struct lock_class_key gfs2_quota_imutex_key; 785 786 static int init_inodes(struct gfs2_sbd *sdp, int undo) 787 { 788 int error = 0; 789 struct inode *master = d_inode(sdp->sd_master_dir); 790 791 if (undo) 792 goto fail_qinode; 793 794 error = init_journal(sdp, undo); 795 complete_all(&sdp->sd_journal_ready); 796 if (error) 797 goto fail; 798 799 /* Read in the master statfs inode */ 800 sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs"); 801 if (IS_ERR(sdp->sd_statfs_inode)) { 802 error = PTR_ERR(sdp->sd_statfs_inode); 803 fs_err(sdp, "can't read in statfs inode: %d\n", error); 804 goto fail_journal; 805 } 806 807 /* Read in the resource index inode */ 808 sdp->sd_rindex = gfs2_lookup_simple(master, "rindex"); 809 if (IS_ERR(sdp->sd_rindex)) { 810 error = PTR_ERR(sdp->sd_rindex); 811 fs_err(sdp, "can't get resource index inode: %d\n", error); 812 goto fail_statfs; 813 } 814 sdp->sd_rindex_uptodate = 0; 815 816 /* Read in the quota inode */ 817 sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota"); 818 if (IS_ERR(sdp->sd_quota_inode)) { 819 error = PTR_ERR(sdp->sd_quota_inode); 820 fs_err(sdp, "can't get quota file inode: %d\n", error); 821 goto fail_rindex; 822 } 823 /* 824 * i_mutex on quota files is special. Since this inode is hidden system 825 * file, we are safe to define locking ourselves. 826 */ 827 lockdep_set_class(&sdp->sd_quota_inode->i_rwsem, 828 &gfs2_quota_imutex_key); 829 830 error = gfs2_rindex_update(sdp); 831 if (error) 832 goto fail_qinode; 833 834 return 0; 835 836 fail_qinode: 837 iput(sdp->sd_quota_inode); 838 fail_rindex: 839 gfs2_clear_rgrpd(sdp); 840 iput(sdp->sd_rindex); 841 fail_statfs: 842 iput(sdp->sd_statfs_inode); 843 fail_journal: 844 init_journal(sdp, UNDO); 845 fail: 846 return error; 847 } 848 849 static int init_per_node(struct gfs2_sbd *sdp, int undo) 850 { 851 struct inode *pn = NULL; 852 char buf[30]; 853 int error = 0; 854 struct gfs2_inode *ip; 855 struct inode *master = d_inode(sdp->sd_master_dir); 856 857 if (sdp->sd_args.ar_spectator) 858 return 0; 859 860 if (undo) 861 goto fail_qc_gh; 862 863 pn = gfs2_lookup_simple(master, "per_node"); 864 if (IS_ERR(pn)) { 865 error = PTR_ERR(pn); 866 fs_err(sdp, "can't find per_node directory: %d\n", error); 867 return error; 868 } 869 870 sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid); 871 sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf); 872 if (IS_ERR(sdp->sd_sc_inode)) { 873 error = PTR_ERR(sdp->sd_sc_inode); 874 fs_err(sdp, "can't find local \"sc\" file: %d\n", error); 875 goto fail; 876 } 877 878 sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid); 879 sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf); 880 if (IS_ERR(sdp->sd_qc_inode)) { 881 error = PTR_ERR(sdp->sd_qc_inode); 882 fs_err(sdp, "can't find local \"qc\" file: %d\n", error); 883 goto fail_ut_i; 884 } 885 886 iput(pn); 887 pn = NULL; 888 889 ip = GFS2_I(sdp->sd_sc_inode); 890 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 891 &sdp->sd_sc_gh); 892 if (error) { 893 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error); 894 goto fail_qc_i; 895 } 896 897 ip = GFS2_I(sdp->sd_qc_inode); 898 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, 899 &sdp->sd_qc_gh); 900 if (error) { 901 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error); 902 goto fail_ut_gh; 903 } 904 905 return 0; 906 907 fail_qc_gh: 908 gfs2_glock_dq_uninit(&sdp->sd_qc_gh); 909 fail_ut_gh: 910 gfs2_glock_dq_uninit(&sdp->sd_sc_gh); 911 fail_qc_i: 912 iput(sdp->sd_qc_inode); 913 fail_ut_i: 914 iput(sdp->sd_sc_inode); 915 fail: 916 iput(pn); 917 return error; 918 } 919 920 static const match_table_t nolock_tokens = { 921 { Opt_jid, "jid=%d\n", }, 922 { Opt_err, NULL }, 923 }; 924 925 static const struct lm_lockops nolock_ops = { 926 .lm_proto_name = "lock_nolock", 927 .lm_put_lock = gfs2_glock_free, 928 .lm_tokens = &nolock_tokens, 929 }; 930 931 /** 932 * gfs2_lm_mount - mount a locking protocol 933 * @sdp: the filesystem 934 * @args: mount arguments 935 * @silent: if 1, don't complain if the FS isn't a GFS2 fs 936 * 937 * Returns: errno 938 */ 939 940 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent) 941 { 942 const struct lm_lockops *lm; 943 struct lm_lockstruct *ls = &sdp->sd_lockstruct; 944 struct gfs2_args *args = &sdp->sd_args; 945 const char *proto = sdp->sd_proto_name; 946 const char *table = sdp->sd_table_name; 947 char *o, *options; 948 int ret; 949 950 if (!strcmp("lock_nolock", proto)) { 951 lm = &nolock_ops; 952 sdp->sd_args.ar_localflocks = 1; 953 #ifdef CONFIG_GFS2_FS_LOCKING_DLM 954 } else if (!strcmp("lock_dlm", proto)) { 955 lm = &gfs2_dlm_ops; 956 #endif 957 } else { 958 pr_info("can't find protocol %s\n", proto); 959 return -ENOENT; 960 } 961 962 fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table); 963 964 ls->ls_ops = lm; 965 ls->ls_first = 1; 966 967 for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) { 968 substring_t tmp[MAX_OPT_ARGS]; 969 int token, option; 970 971 if (!o || !*o) 972 continue; 973 974 token = match_token(o, *lm->lm_tokens, tmp); 975 switch (token) { 976 case Opt_jid: 977 ret = match_int(&tmp[0], &option); 978 if (ret || option < 0) 979 goto hostdata_error; 980 if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags)) 981 ls->ls_jid = option; 982 break; 983 case Opt_id: 984 case Opt_nodir: 985 /* Obsolete, but left for backward compat purposes */ 986 break; 987 case Opt_first: 988 ret = match_int(&tmp[0], &option); 989 if (ret || (option != 0 && option != 1)) 990 goto hostdata_error; 991 ls->ls_first = option; 992 break; 993 case Opt_err: 994 default: 995 hostdata_error: 996 fs_info(sdp, "unknown hostdata (%s)\n", o); 997 return -EINVAL; 998 } 999 } 1000 1001 if (lm->lm_mount == NULL) { 1002 fs_info(sdp, "Now mounting FS...\n"); 1003 complete_all(&sdp->sd_locking_init); 1004 return 0; 1005 } 1006 ret = lm->lm_mount(sdp, table); 1007 if (ret == 0) 1008 fs_info(sdp, "Joined cluster. Now mounting FS...\n"); 1009 complete_all(&sdp->sd_locking_init); 1010 return ret; 1011 } 1012 1013 void gfs2_lm_unmount(struct gfs2_sbd *sdp) 1014 { 1015 const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops; 1016 if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) && 1017 lm->lm_unmount) 1018 lm->lm_unmount(sdp); 1019 } 1020 1021 static int wait_on_journal(struct gfs2_sbd *sdp) 1022 { 1023 if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL) 1024 return 0; 1025 1026 return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE) 1027 ? -EINTR : 0; 1028 } 1029 1030 void gfs2_online_uevent(struct gfs2_sbd *sdp) 1031 { 1032 struct super_block *sb = sdp->sd_vfs; 1033 char ro[20]; 1034 char spectator[20]; 1035 char *envp[] = { ro, spectator, NULL }; 1036 sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0); 1037 sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0); 1038 kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp); 1039 } 1040 1041 /** 1042 * fill_super - Read in superblock 1043 * @sb: The VFS superblock 1044 * @data: Mount options 1045 * @silent: Don't complain if it's not a GFS2 filesystem 1046 * 1047 * Returns: errno 1048 */ 1049 1050 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent) 1051 { 1052 struct gfs2_sbd *sdp; 1053 struct gfs2_holder mount_gh; 1054 int error; 1055 1056 sdp = init_sbd(sb); 1057 if (!sdp) { 1058 pr_warn("can't alloc struct gfs2_sbd\n"); 1059 return -ENOMEM; 1060 } 1061 sdp->sd_args = *args; 1062 1063 if (sdp->sd_args.ar_spectator) { 1064 sb->s_flags |= MS_RDONLY; 1065 set_bit(SDF_RORECOVERY, &sdp->sd_flags); 1066 } 1067 if (sdp->sd_args.ar_posix_acl) 1068 sb->s_flags |= MS_POSIXACL; 1069 if (sdp->sd_args.ar_nobarrier) 1070 set_bit(SDF_NOBARRIERS, &sdp->sd_flags); 1071 1072 sb->s_flags |= MS_NOSEC; 1073 sb->s_magic = GFS2_MAGIC; 1074 sb->s_op = &gfs2_super_ops; 1075 sb->s_d_op = &gfs2_dops; 1076 sb->s_export_op = &gfs2_export_ops; 1077 sb->s_xattr = gfs2_xattr_handlers; 1078 sb->s_qcop = &gfs2_quotactl_ops; 1079 sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; 1080 sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE; 1081 sb->s_time_gran = 1; 1082 sb->s_maxbytes = MAX_LFS_FILESIZE; 1083 1084 /* Set up the buffer cache and fill in some fake block size values 1085 to allow us to read-in the on-disk superblock. */ 1086 sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK); 1087 sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits; 1088 sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 1089 GFS2_BASIC_BLOCK_SHIFT; 1090 sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; 1091 1092 sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit; 1093 sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum; 1094 if (sdp->sd_args.ar_statfs_quantum) { 1095 sdp->sd_tune.gt_statfs_slow = 0; 1096 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum; 1097 } else { 1098 sdp->sd_tune.gt_statfs_slow = 1; 1099 sdp->sd_tune.gt_statfs_quantum = 30; 1100 } 1101 1102 error = init_names(sdp, silent); 1103 if (error) { 1104 /* In this case, we haven't initialized sysfs, so we have to 1105 manually free the sdp. */ 1106 free_percpu(sdp->sd_lkstats); 1107 kfree(sdp); 1108 sb->s_fs_info = NULL; 1109 return error; 1110 } 1111 1112 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name); 1113 1114 error = gfs2_sys_fs_add(sdp); 1115 /* 1116 * If we hit an error here, gfs2_sys_fs_add will have called function 1117 * kobject_put which causes the sysfs usage count to go to zero, which 1118 * causes sysfs to call function gfs2_sbd_release, which frees sdp. 1119 * Subsequent error paths here will call gfs2_sys_fs_del, which also 1120 * kobject_put to free sdp. 1121 */ 1122 if (error) 1123 return error; 1124 1125 gfs2_create_debugfs_file(sdp); 1126 1127 error = gfs2_lm_mount(sdp, silent); 1128 if (error) 1129 goto fail_debug; 1130 1131 error = init_locking(sdp, &mount_gh, DO); 1132 if (error) 1133 goto fail_lm; 1134 1135 error = init_sb(sdp, silent); 1136 if (error) 1137 goto fail_locking; 1138 1139 error = wait_on_journal(sdp); 1140 if (error) 1141 goto fail_sb; 1142 1143 /* 1144 * If user space has failed to join the cluster or some similar 1145 * failure has occurred, then the journal id will contain a 1146 * negative (error) number. This will then be returned to the 1147 * caller (of the mount syscall). We do this even for spectator 1148 * mounts (which just write a jid of 0 to indicate "ok" even though 1149 * the jid is unused in the spectator case) 1150 */ 1151 if (sdp->sd_lockstruct.ls_jid < 0) { 1152 error = sdp->sd_lockstruct.ls_jid; 1153 sdp->sd_lockstruct.ls_jid = 0; 1154 goto fail_sb; 1155 } 1156 1157 if (sdp->sd_args.ar_spectator) 1158 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", 1159 sdp->sd_table_name); 1160 else 1161 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", 1162 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid); 1163 1164 error = init_inodes(sdp, DO); 1165 if (error) 1166 goto fail_sb; 1167 1168 error = init_per_node(sdp, DO); 1169 if (error) 1170 goto fail_inodes; 1171 1172 error = gfs2_statfs_init(sdp); 1173 if (error) { 1174 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error); 1175 goto fail_per_node; 1176 } 1177 1178 if (!(sb->s_flags & MS_RDONLY)) { 1179 error = gfs2_make_fs_rw(sdp); 1180 if (error) { 1181 fs_err(sdp, "can't make FS RW: %d\n", error); 1182 goto fail_per_node; 1183 } 1184 } 1185 1186 gfs2_glock_dq_uninit(&mount_gh); 1187 gfs2_online_uevent(sdp); 1188 return 0; 1189 1190 fail_per_node: 1191 init_per_node(sdp, UNDO); 1192 fail_inodes: 1193 init_inodes(sdp, UNDO); 1194 fail_sb: 1195 if (sdp->sd_root_dir) 1196 dput(sdp->sd_root_dir); 1197 if (sdp->sd_master_dir) 1198 dput(sdp->sd_master_dir); 1199 if (sb->s_root) 1200 dput(sb->s_root); 1201 sb->s_root = NULL; 1202 fail_locking: 1203 init_locking(sdp, &mount_gh, UNDO); 1204 fail_lm: 1205 complete_all(&sdp->sd_journal_ready); 1206 gfs2_gl_hash_clear(sdp); 1207 gfs2_lm_unmount(sdp); 1208 fail_debug: 1209 gfs2_delete_debugfs_file(sdp); 1210 free_percpu(sdp->sd_lkstats); 1211 /* gfs2_sys_fs_del must be the last thing we do, since it causes 1212 * sysfs to call function gfs2_sbd_release, which frees sdp. */ 1213 gfs2_sys_fs_del(sdp); 1214 sb->s_fs_info = NULL; 1215 return error; 1216 } 1217 1218 static int set_gfs2_super(struct super_block *s, void *data) 1219 { 1220 s->s_bdev = data; 1221 s->s_dev = s->s_bdev->bd_dev; 1222 1223 /* 1224 * We set the bdi here to the queue backing, file systems can 1225 * overwrite this in ->fill_super() 1226 */ 1227 s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info; 1228 return 0; 1229 } 1230 1231 static int test_gfs2_super(struct super_block *s, void *ptr) 1232 { 1233 struct block_device *bdev = ptr; 1234 return (bdev == s->s_bdev); 1235 } 1236 1237 /** 1238 * gfs2_mount - Get the GFS2 superblock 1239 * @fs_type: The GFS2 filesystem type 1240 * @flags: Mount flags 1241 * @dev_name: The name of the device 1242 * @data: The mount arguments 1243 * 1244 * Q. Why not use get_sb_bdev() ? 1245 * A. We need to select one of two root directories to mount, independent 1246 * of whether this is the initial, or subsequent, mount of this sb 1247 * 1248 * Returns: 0 or -ve on error 1249 */ 1250 1251 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags, 1252 const char *dev_name, void *data) 1253 { 1254 struct block_device *bdev; 1255 struct super_block *s; 1256 fmode_t mode = FMODE_READ | FMODE_EXCL; 1257 int error; 1258 struct gfs2_args args; 1259 struct gfs2_sbd *sdp; 1260 1261 if (!(flags & MS_RDONLY)) 1262 mode |= FMODE_WRITE; 1263 1264 bdev = blkdev_get_by_path(dev_name, mode, fs_type); 1265 if (IS_ERR(bdev)) 1266 return ERR_CAST(bdev); 1267 1268 /* 1269 * once the super is inserted into the list by sget, s_umount 1270 * will protect the lockfs code from trying to start a snapshot 1271 * while we are mounting 1272 */ 1273 mutex_lock(&bdev->bd_fsfreeze_mutex); 1274 if (bdev->bd_fsfreeze_count > 0) { 1275 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1276 error = -EBUSY; 1277 goto error_bdev; 1278 } 1279 s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev); 1280 mutex_unlock(&bdev->bd_fsfreeze_mutex); 1281 error = PTR_ERR(s); 1282 if (IS_ERR(s)) 1283 goto error_bdev; 1284 1285 if (s->s_root) { 1286 /* 1287 * s_umount nests inside bd_mutex during 1288 * __invalidate_device(). blkdev_put() acquires 1289 * bd_mutex and can't be called under s_umount. Drop 1290 * s_umount temporarily. This is safe as we're 1291 * holding an active reference. 1292 */ 1293 up_write(&s->s_umount); 1294 blkdev_put(bdev, mode); 1295 down_write(&s->s_umount); 1296 } else { 1297 /* s_mode must be set before deactivate_locked_super calls */ 1298 s->s_mode = mode; 1299 } 1300 1301 memset(&args, 0, sizeof(args)); 1302 args.ar_quota = GFS2_QUOTA_DEFAULT; 1303 args.ar_data = GFS2_DATA_DEFAULT; 1304 args.ar_commit = 30; 1305 args.ar_statfs_quantum = 30; 1306 args.ar_quota_quantum = 60; 1307 args.ar_errors = GFS2_ERRORS_DEFAULT; 1308 1309 error = gfs2_mount_args(&args, data); 1310 if (error) { 1311 pr_warn("can't parse mount arguments\n"); 1312 goto error_super; 1313 } 1314 1315 if (s->s_root) { 1316 error = -EBUSY; 1317 if ((flags ^ s->s_flags) & MS_RDONLY) 1318 goto error_super; 1319 } else { 1320 snprintf(s->s_id, sizeof(s->s_id), "%pg", bdev); 1321 sb_set_blocksize(s, block_size(bdev)); 1322 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0); 1323 if (error) 1324 goto error_super; 1325 s->s_flags |= MS_ACTIVE; 1326 bdev->bd_super = s; 1327 } 1328 1329 sdp = s->s_fs_info; 1330 if (args.ar_meta) 1331 return dget(sdp->sd_master_dir); 1332 else 1333 return dget(sdp->sd_root_dir); 1334 1335 error_super: 1336 deactivate_locked_super(s); 1337 return ERR_PTR(error); 1338 error_bdev: 1339 blkdev_put(bdev, mode); 1340 return ERR_PTR(error); 1341 } 1342 1343 static int set_meta_super(struct super_block *s, void *ptr) 1344 { 1345 return -EINVAL; 1346 } 1347 1348 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type, 1349 int flags, const char *dev_name, void *data) 1350 { 1351 struct super_block *s; 1352 struct gfs2_sbd *sdp; 1353 struct path path; 1354 int error; 1355 1356 error = kern_path(dev_name, LOOKUP_FOLLOW, &path); 1357 if (error) { 1358 pr_warn("path_lookup on %s returned error %d\n", 1359 dev_name, error); 1360 return ERR_PTR(error); 1361 } 1362 s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags, 1363 path.dentry->d_sb->s_bdev); 1364 path_put(&path); 1365 if (IS_ERR(s)) { 1366 pr_warn("gfs2 mount does not exist\n"); 1367 return ERR_CAST(s); 1368 } 1369 if ((flags ^ s->s_flags) & MS_RDONLY) { 1370 deactivate_locked_super(s); 1371 return ERR_PTR(-EBUSY); 1372 } 1373 sdp = s->s_fs_info; 1374 return dget(sdp->sd_master_dir); 1375 } 1376 1377 static void gfs2_kill_sb(struct super_block *sb) 1378 { 1379 struct gfs2_sbd *sdp = sb->s_fs_info; 1380 1381 if (sdp == NULL) { 1382 kill_block_super(sb); 1383 return; 1384 } 1385 1386 gfs2_log_flush(sdp, NULL, SYNC_FLUSH); 1387 dput(sdp->sd_root_dir); 1388 dput(sdp->sd_master_dir); 1389 sdp->sd_root_dir = NULL; 1390 sdp->sd_master_dir = NULL; 1391 shrink_dcache_sb(sb); 1392 gfs2_delete_debugfs_file(sdp); 1393 free_percpu(sdp->sd_lkstats); 1394 kill_block_super(sb); 1395 } 1396 1397 struct file_system_type gfs2_fs_type = { 1398 .name = "gfs2", 1399 .fs_flags = FS_REQUIRES_DEV, 1400 .mount = gfs2_mount, 1401 .kill_sb = gfs2_kill_sb, 1402 .owner = THIS_MODULE, 1403 }; 1404 MODULE_ALIAS_FS("gfs2"); 1405 1406 struct file_system_type gfs2meta_fs_type = { 1407 .name = "gfs2meta", 1408 .fs_flags = FS_REQUIRES_DEV, 1409 .mount = gfs2_mount_meta, 1410 .owner = THIS_MODULE, 1411 }; 1412 MODULE_ALIAS_FS("gfs2meta"); 1413