git.oblomov.eu Git - linux-2.6/blob - fs/gfs2/ops_fstype.c

   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 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/lm_interface.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "bmap.h"
  25 #include "glock.h"
  26 #include "glops.h"
  27 #include "inode.h"
  28 #include "mount.h"
  29 #include "recovery.h"
  30 #include "rgrp.h"
  31 #include "super.h"
  32 #include "sys.h"
  33 #include "util.h"
  34 #include "log.h"
  35 #include "quota.h"
  36 #include "dir.h"
  37
  38 #define DO 0
  39 #define UNDO 1
  40
  41 static const u32 gfs2_old_fs_formats[] = {
  42         0
  43 };
  44
  45 static const u32 gfs2_old_multihost_formats[] = {
  46         0
  47 };
  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->gt_spin);
  58
  59         gt->gt_incore_log_blocks = 1024;
  60         gt->gt_log_flush_secs = 60;
  61         gt->gt_recoverd_secs = 60;
  62         gt->gt_logd_secs = 1;
  63         gt->gt_quota_simul_sync = 64;
  64         gt->gt_quota_warn_period = 10;
  65         gt->gt_quota_scale_num = 1;
  66         gt->gt_quota_scale_den = 1;
  67         gt->gt_quota_cache_secs = 300;
  68         gt->gt_quota_quantum = 60;
  69         gt->gt_new_files_jdata = 0;
  70         gt->gt_max_readahead = 1 << 18;
  71         gt->gt_stall_secs = 600;
  72         gt->gt_complain_secs = 10;
  73         gt->gt_statfs_quantum = 30;
  74         gt->gt_statfs_slow = 0;
  75 }
  76
  77 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  78 {
  79         struct gfs2_sbd *sdp;
  80
  81         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  82         if (!sdp)
  83                 return NULL;
  84
  85         sb->s_fs_info = sdp;
  86         sdp->sd_vfs = sb;
  87
  88         gfs2_tune_init(&sdp->sd_tune);
  89
  90         mutex_init(&sdp->sd_inum_mutex);
  91         spin_lock_init(&sdp->sd_statfs_spin);
  92
  93         spin_lock_init(&sdp->sd_rindex_spin);
  94         mutex_init(&sdp->sd_rindex_mutex);
  95         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  96         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  97
  98         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  99         spin_lock_init(&sdp->sd_jindex_spin);
 100         mutex_init(&sdp->sd_jindex_mutex);
 101
 102         INIT_LIST_HEAD(&sdp->sd_quota_list);
 103         spin_lock_init(&sdp->sd_quota_spin);
 104         mutex_init(&sdp->sd_quota_mutex);
 105         init_waitqueue_head(&sdp->sd_quota_wait);
 106         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 107         spin_lock_init(&sdp->sd_trunc_lock);
 108
 109         spin_lock_init(&sdp->sd_log_lock);
 110
 111         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 112         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 113         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 114         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 115         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 116
 117         mutex_init(&sdp->sd_log_reserve_mutex);
 118         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 119         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 120
 121         init_rwsem(&sdp->sd_log_flush_lock);
 122         atomic_set(&sdp->sd_log_in_flight, 0);
 123         init_waitqueue_head(&sdp->sd_log_flush_wait);
 124
 125         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 126
 127         mutex_init(&sdp->sd_freeze_lock);
 128
 129         return sdp;
 130 }
 131
 132
 133 /**
 134  * gfs2_check_sb - Check superblock
 135  * @sdp: the filesystem
 136  * @sb: The superblock
 137  * @silent: Don't print a message if the check fails
 138  *
 139  * Checks the version code of the FS is one that we understand how to
 140  * read and that the sizes of the various on-disk structures have not
 141  * changed.
 142  */
 143
 144 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 145 {
 146         unsigned int x;
 147
 148         if (sb->sb_magic != GFS2_MAGIC ||
 149             sb->sb_type != GFS2_METATYPE_SB) {
 150                 if (!silent)
 151                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 152                 return -EINVAL;
 153         }
 154
 155         /*  If format numbers match exactly, we're done.  */
 156
 157         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 158             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 159                 return 0;
 160
 161         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 162                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 163                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 164                                 break;
 165
 166                 if (!gfs2_old_fs_formats[x]) {
 167                         printk(KERN_WARNING
 168                                "GFS2: code version (%u, %u) is incompatible "
 169                                "with ondisk format (%u, %u)\n",
 170                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 171                                sb->sb_fs_format, sb->sb_multihost_format);
 172                         printk(KERN_WARNING
 173                                "GFS2: I don't know how to upgrade this FS\n");
 174                         return -EINVAL;
 175                 }
 176         }
 177
 178         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 179                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 180                         if (gfs2_old_multihost_formats[x] ==
 181                             sb->sb_multihost_format)
 182                                 break;
 183
 184                 if (!gfs2_old_multihost_formats[x]) {
 185                         printk(KERN_WARNING
 186                                "GFS2: code version (%u, %u) is incompatible "
 187                                "with ondisk format (%u, %u)\n",
 188                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 189                                sb->sb_fs_format, sb->sb_multihost_format);
 190                         printk(KERN_WARNING
 191                                "GFS2: I don't know how to upgrade this FS\n");
 192                         return -EINVAL;
 193                 }
 194         }
 195
 196         if (!sdp->sd_args.ar_upgrade) {
 197                 printk(KERN_WARNING
 198                        "GFS2: code version (%u, %u) is incompatible "
 199                        "with ondisk format (%u, %u)\n",
 200                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 201                        sb->sb_fs_format, sb->sb_multihost_format);
 202                 printk(KERN_INFO
 203                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 204                        "the FS\n");
 205                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 206                 return -EINVAL;
 207         }
 208
 209         return 0;
 210 }
 211
 212 static void end_bio_io_page(struct bio *bio, int error)
 213 {
 214         struct page *page = bio->bi_private;
 215
 216         if (!error)
 217                 SetPageUptodate(page);
 218         else
 219                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 220         unlock_page(page);
 221 }
 222
 223 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 224 {
 225         const struct gfs2_sb *str = buf;
 226
 227         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 228         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 229         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 230         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 231         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 232         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 233         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 234         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 235         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 236         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 237         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 238
 239         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 240         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 241 }
 242
 243 /**
 244  * gfs2_read_super - Read the gfs2 super block from disk
 245  * @sdp: The GFS2 super block
 246  * @sector: The location of the super block
 247  * @error: The error code to return
 248  *
 249  * This uses the bio functions to read the super block from disk
 250  * because we want to be 100% sure that we never read cached data.
 251  * A super block is read twice only during each GFS2 mount and is
 252  * never written to by the filesystem. The first time its read no
 253  * locks are held, and the only details which are looked at are those
 254  * relating to the locking protocol. Once locking is up and working,
 255  * the sb is read again under the lock to establish the location of
 256  * the master directory (contains pointers to journals etc) and the
 257  * root directory.
 258  *
 259  * Returns: 0 on success or error
 260  */
 261
 262 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 263 {
 264         struct super_block *sb = sdp->sd_vfs;
 265         struct gfs2_sb *p;
 266         struct page *page;
 267         struct bio *bio;
 268
 269         page = alloc_page(GFP_NOFS);
 270         if (unlikely(!page))
 271                 return -ENOBUFS;
 272
 273         ClearPageUptodate(page);
 274         ClearPageDirty(page);
 275         lock_page(page);
 276
 277         bio = bio_alloc(GFP_NOFS, 1);
 278         if (unlikely(!bio)) {
 279                 __free_page(page);
 280                 return -ENOBUFS;
 281         }
 282
 283         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 284         bio->bi_bdev = sb->s_bdev;
 285         bio_add_page(bio, page, PAGE_SIZE, 0);
 286
 287         bio->bi_end_io = end_bio_io_page;
 288         bio->bi_private = page;
 289         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 290         wait_on_page_locked(page);
 291         bio_put(bio);
 292         if (!PageUptodate(page)) {
 293                 __free_page(page);
 294                 return -EIO;
 295         }
 296         p = kmap(page);
 297         gfs2_sb_in(&sdp->sd_sb, p);
 298         kunmap(page);
 299         __free_page(page);
 300         return 0;
 301 }
 302 /**
 303  * gfs2_read_sb - Read super block
 304  * @sdp: The GFS2 superblock
 305  * @gl: the glock for the superblock (assumed to be held)
 306  * @silent: Don't print message if mount fails
 307  *
 308  */
 309
 310 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
 311 {
 312         u32 hash_blocks, ind_blocks, leaf_blocks;
 313         u32 tmp_blocks;
 314         unsigned int x;
 315         int error;
 316
 317         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 318         if (error) {
 319                 if (!silent)
 320                         fs_err(sdp, "can't read superblock\n");
 321                 return error;
 322         }
 323
 324         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 325         if (error)
 326                 return error;
 327
 328         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 329                                GFS2_BASIC_BLOCK_SHIFT;
 330         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 331         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 332                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 333         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 334                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 335         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 336         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 337         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 338         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 339         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 340                                 sizeof(struct gfs2_meta_header)) /
 341                                 sizeof(struct gfs2_quota_change);
 342
 343         /* Compute maximum reservation required to add a entry to a directory */
 344
 345         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 346                              sdp->sd_jbsize);
 347
 348         ind_blocks = 0;
 349         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 350                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 351                 ind_blocks += tmp_blocks;
 352         }
 353
 354         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 355
 356         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 357
 358         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 359                                 sizeof(struct gfs2_dinode);
 360         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 361         for (x = 2;; x++) {
 362                 u64 space, d;
 363                 u32 m;
 364
 365                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 366                 d = space;
 367                 m = do_div(d, sdp->sd_inptrs);
 368
 369                 if (d != sdp->sd_heightsize[x - 1] || m)
 370                         break;
 371                 sdp->sd_heightsize[x] = space;
 372         }
 373         sdp->sd_max_height = x;
 374         sdp->sd_heightsize[x] = ~0;
 375         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 376
 377         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 378                                  sizeof(struct gfs2_dinode);
 379         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 380         for (x = 2;; x++) {
 381                 u64 space, d;
 382                 u32 m;
 383
 384                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 385                 d = space;
 386                 m = do_div(d, sdp->sd_inptrs);
 387
 388                 if (d != sdp->sd_jheightsize[x - 1] || m)
 389                         break;
 390                 sdp->sd_jheightsize[x] = space;
 391         }
 392         sdp->sd_max_jheight = x;
 393         sdp->sd_jheightsize[x] = ~0;
 394         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 395
 396         return 0;
 397 }
 398
 399 static int init_names(struct gfs2_sbd *sdp, int silent)
 400 {
 401         char *proto, *table;
 402         int error = 0;
 403
 404         proto = sdp->sd_args.ar_lockproto;
 405         table = sdp->sd_args.ar_locktable;
 406
 407         /*  Try to autodetect  */
 408
 409         if (!proto[0] || !table[0]) {
 410                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 411                 if (error)
 412                         return error;
 413
 414                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 415                 if (error)
 416                         goto out;
 417
 418                 if (!proto[0])
 419                         proto = sdp->sd_sb.sb_lockproto;
 420                 if (!table[0])
 421                         table = sdp->sd_sb.sb_locktable;
 422         }
 423
 424         if (!table[0])
 425                 table = sdp->sd_vfs->s_id;
 426
 427         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 428         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 429
 430         table = sdp->sd_table_name;
 431         while ((table = strchr(table, '/')))
 432                 *table = '_';
 433
 434 out:
 435         return error;
 436 }
 437
 438 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 439                         int undo)
 440 {
 441         int error = 0;
 442
 443         if (undo)
 444                 goto fail_trans;
 445
 446         error = gfs2_glock_nq_num(sdp,
 447                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 448                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 449                                   mount_gh);
 450         if (error) {
 451                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 452                 goto fail;
 453         }
 454
 455         error = gfs2_glock_nq_num(sdp,
 456                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 457                                   LM_ST_SHARED,
 458                                   LM_FLAG_NOEXP | GL_EXACT,
 459                                   &sdp->sd_live_gh);
 460         if (error) {
 461                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 462                 goto fail_mount;
 463         }
 464
 465         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 466                                CREATE, &sdp->sd_rename_gl);
 467         if (error) {
 468                 fs_err(sdp, "can't create rename glock: %d\n", error);
 469                 goto fail_live;
 470         }
 471
 472         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 473                                CREATE, &sdp->sd_trans_gl);
 474         if (error) {
 475                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 476                 goto fail_rename;
 477         }
 478
 479         return 0;
 480
 481 fail_trans:
 482         gfs2_glock_put(sdp->sd_trans_gl);
 483 fail_rename:
 484         gfs2_glock_put(sdp->sd_rename_gl);
 485 fail_live:
 486         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 487 fail_mount:
 488         gfs2_glock_dq_uninit(mount_gh);
 489 fail:
 490         return error;
 491 }
 492
 493 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 494                             u64 no_addr, const char *name)
 495 {
 496         struct gfs2_sbd *sdp = sb->s_fs_info;
 497         struct dentry *dentry;
 498         struct inode *inode;
 499
 500         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 501         if (IS_ERR(inode)) {
 502                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 503                 return PTR_ERR(inode);
 504         }
 505         dentry = d_alloc_root(inode);
 506         if (!dentry) {
 507                 fs_err(sdp, "can't alloc %s dentry\n", name);
 508                 iput(inode);
 509                 return -ENOMEM;
 510         }
 511         dentry->d_op = &gfs2_dops;
 512         *dptr = dentry;
 513         return 0;
 514 }
 515
 516 static int init_sb(struct gfs2_sbd *sdp, int silent)
 517 {
 518         struct super_block *sb = sdp->sd_vfs;
 519         struct gfs2_holder sb_gh;
 520         u64 no_addr;
 521         int ret;
 522
 523         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 524                                 LM_ST_SHARED, 0, &sb_gh);
 525         if (ret) {
 526                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 527                 return ret;
 528         }
 529
 530         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 531         if (ret) {
 532                 fs_err(sdp, "can't read superblock: %d\n", ret);
 533                 goto out;
 534         }
 535
 536         /* Set up the buffer cache and SB for real */
 537         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 538                 ret = -EINVAL;
 539                 fs_err(sdp, "FS block size (%u) is too small for device "
 540                        "block size (%u)\n",
 541                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 542                 goto out;
 543         }
 544         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 545                 ret = -EINVAL;
 546                 fs_err(sdp, "FS block size (%u) is too big for machine "
 547                        "page size (%u)\n",
 548                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 549                 goto out;
 550         }
 551         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 552
 553         /* Get the root inode */
 554         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 555         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 556         if (ret)
 557                 goto out;
 558
 559         /* Get the master inode */
 560         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 561         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 562         if (ret) {
 563                 dput(sdp->sd_root_dir);
 564                 goto out;
 565         }
 566         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 567 out:
 568         gfs2_glock_dq_uninit(&sb_gh);
 569         return ret;
 570 }
 571
 572 /**
 573  * map_journal_extents - create a reusable "extent" mapping from all logical
 574  * blocks to all physical blocks for the given journal.  This will save
 575  * us time when writing journal blocks.  Most journals will have only one
 576  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 577  * arranges the journal blocks sequentially to maximize performance.
 578  * So the extent would map the first block for the entire file length.
 579  * However, gfs2_jadd can happen while file activity is happening, so
 580  * those journals may not be sequential.  Less likely is the case where
 581  * the users created their own journals by mounting the metafs and
 582  * laying it out.  But it's still possible.  These journals might have
 583  * several extents.
 584  *
 585  * TODO: This should be done in bigger chunks rather than one block at a time,
 586  *       but since it's only done at mount time, I'm not worried about the
 587  *       time it takes.
 588  */
 589 static int map_journal_extents(struct gfs2_sbd *sdp)
 590 {
 591         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 592         unsigned int lb;
 593         u64 db, prev_db; /* logical block, disk block, prev disk block */
 594         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 595         struct gfs2_journal_extent *jext = NULL;
 596         struct buffer_head bh;
 597         int rc = 0;
 598
 599         prev_db = 0;
 600
 601         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 602                 bh.b_state = 0;
 603                 bh.b_blocknr = 0;
 604                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 605                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 606                 db = bh.b_blocknr;
 607                 if (rc || !db) {
 608                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 609                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 610                         break;
 611                 }
 612                 if (!prev_db || db != prev_db + 1) {
 613                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 614                                        GFP_KERNEL);
 615                         if (!jext) {
 616                                 printk(KERN_INFO "GFS2 error: out of memory "
 617                                        "mapping journal extents.\n");
 618                                 rc = -ENOMEM;
 619                                 break;
 620                         }
 621                         jext->dblock = db;
 622                         jext->lblock = lb;
 623                         jext->blocks = 1;
 624                         list_add_tail(&jext->extent_list, &jd->extent_list);
 625                 } else {
 626                         jext->blocks++;
 627                 }
 628                 prev_db = db;
 629         }
 630         return rc;
 631 }
 632
 633 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
 634 {
 635         if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
 636                 return;
 637         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 638                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
 639                                         sdp->sd_lockstruct.ls_lockspace);
 640 }
 641
 642 /**
 643  * gfs2_jindex_hold - Grab a lock on the jindex
 644  * @sdp: The GFS2 superblock
 645  * @ji_gh: the holder for the jindex glock
 646  *
 647  * Returns: errno
 648  */
 649
 650 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 651 {
 652         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 653         struct qstr name;
 654         char buf[20];
 655         struct gfs2_jdesc *jd;
 656         int error;
 657
 658         name.name = buf;
 659
 660         mutex_lock(&sdp->sd_jindex_mutex);
 661
 662         for (;;) {
 663                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 664                 if (error)
 665                         break;
 666
 667                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 668                 name.hash = gfs2_disk_hash(name.name, name.len);
 669
 670                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 671                 if (error == -ENOENT) {
 672                         error = 0;
 673                         break;
 674                 }
 675
 676                 gfs2_glock_dq_uninit(ji_gh);
 677
 678                 if (error)
 679                         break;
 680
 681                 error = -ENOMEM;
 682                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 683                 if (!jd)
 684                         break;
 685
 686                 INIT_LIST_HEAD(&jd->extent_list);
 687                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 688                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 689                         if (!jd->jd_inode)
 690                                 error = -ENOENT;
 691                         else
 692                                 error = PTR_ERR(jd->jd_inode);
 693                         kfree(jd);
 694                         break;
 695                 }
 696
 697                 spin_lock(&sdp->sd_jindex_spin);
 698                 jd->jd_jid = sdp->sd_journals++;
 699                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 700                 spin_unlock(&sdp->sd_jindex_spin);
 701         }
 702
 703         mutex_unlock(&sdp->sd_jindex_mutex);
 704
 705         return error;
 706 }
 707
 708 static int init_journal(struct gfs2_sbd *sdp, int undo)
 709 {
 710         struct inode *master = sdp->sd_master_dir->d_inode;
 711         struct gfs2_holder ji_gh;
 712         struct task_struct *p;
 713         struct gfs2_inode *ip;
 714         int jindex = 1;
 715         int error = 0;
 716
 717         if (undo) {
 718                 jindex = 0;
 719                 goto fail_recoverd;
 720         }
 721
 722         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 723         if (IS_ERR(sdp->sd_jindex)) {
 724                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 725                 return PTR_ERR(sdp->sd_jindex);
 726         }
 727         ip = GFS2_I(sdp->sd_jindex);
 728
 729         /* Load in the journal index special file */
 730
 731         error = gfs2_jindex_hold(sdp, &ji_gh);
 732         if (error) {
 733                 fs_err(sdp, "can't read journal index: %d\n", error);
 734                 goto fail;
 735         }
 736
 737         error = -EINVAL;
 738         if (!gfs2_jindex_size(sdp)) {
 739                 fs_err(sdp, "no journals!\n");
 740                 goto fail_jindex;
 741         }
 742
 743         if (sdp->sd_args.ar_spectator) {
 744                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 745                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 746         } else {
 747                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 748                         fs_err(sdp, "can't mount journal #%u\n",
 749                                sdp->sd_lockstruct.ls_jid);
 750                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 751                                gfs2_jindex_size(sdp),
 752                                gfs2_jindex_size(sdp) - 1);
 753                         goto fail_jindex;
 754                 }
 755                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 756
 757                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 758                                           &gfs2_journal_glops,
 759                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 760                                           &sdp->sd_journal_gh);
 761                 if (error) {
 762                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 763                         goto fail_jindex;
 764                 }
 765
 766                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 767                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 768                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 769                                            &sdp->sd_jinode_gh);
 770                 if (error) {
 771                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 772                                error);
 773                         goto fail_journal_gh;
 774                 }
 775
 776                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 777                 if (error) {
 778                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 779                                sdp->sd_jdesc->jd_jid, error);
 780                         goto fail_jinode_gh;
 781                 }
 782                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 783
 784                 /* Map the extents for this journal's blocks */
 785                 map_journal_extents(sdp);
 786         }
 787
 788         if (sdp->sd_lockstruct.ls_first) {
 789                 unsigned int x;
 790                 for (x = 0; x < sdp->sd_journals; x++) {
 791                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 792                         if (error) {
 793                                 fs_err(sdp, "error recovering journal %u: %d\n",
 794                                        x, error);
 795                                 goto fail_jinode_gh;
 796                         }
 797                 }
 798
 799                 gfs2_lm_others_may_mount(sdp);
 800         } else if (!sdp->sd_args.ar_spectator) {
 801                 error = gfs2_recover_journal(sdp->sd_jdesc);
 802                 if (error) {
 803                         fs_err(sdp, "error recovering my journal: %d\n", error);
 804                         goto fail_jinode_gh;
 805                 }
 806         }
 807
 808         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 809         gfs2_glock_dq_uninit(&ji_gh);
 810         jindex = 0;
 811
 812         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 813         error = IS_ERR(p);
 814         if (error) {
 815                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 816                 goto fail_jinode_gh;
 817         }
 818         sdp->sd_recoverd_process = p;
 819
 820         return 0;
 821
 822 fail_recoverd:
 823         kthread_stop(sdp->sd_recoverd_process);
 824 fail_jinode_gh:
 825         if (!sdp->sd_args.ar_spectator)
 826                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 827 fail_journal_gh:
 828         if (!sdp->sd_args.ar_spectator)
 829                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 830 fail_jindex:
 831         gfs2_jindex_free(sdp);
 832         if (jindex)
 833                 gfs2_glock_dq_uninit(&ji_gh);
 834 fail:
 835         iput(sdp->sd_jindex);
 836         return error;
 837 }
 838
 839
 840 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 841 {
 842         int error = 0;
 843         struct gfs2_inode *ip;
 844         struct inode *master = sdp->sd_master_dir->d_inode;
 845
 846         if (undo)
 847                 goto fail_qinode;
 848
 849         error = init_journal(sdp, undo);
 850         if (error)
 851                 goto fail;
 852
 853         /* Read in the master inode number inode */
 854         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 855         if (IS_ERR(sdp->sd_inum_inode)) {
 856                 error = PTR_ERR(sdp->sd_inum_inode);
 857                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 858                 goto fail_journal;
 859         }
 860
 861
 862         /* Read in the master statfs inode */
 863         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 864         if (IS_ERR(sdp->sd_statfs_inode)) {
 865                 error = PTR_ERR(sdp->sd_statfs_inode);
 866                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 867                 goto fail_inum;
 868         }
 869
 870         /* Read in the resource index inode */
 871         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 872         if (IS_ERR(sdp->sd_rindex)) {
 873                 error = PTR_ERR(sdp->sd_rindex);
 874                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 875                 goto fail_statfs;
 876         }
 877         ip = GFS2_I(sdp->sd_rindex);
 878         sdp->sd_rindex_uptodate = 0;
 879
 880         /* Read in the quota inode */
 881         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 882         if (IS_ERR(sdp->sd_quota_inode)) {
 883                 error = PTR_ERR(sdp->sd_quota_inode);
 884                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 885                 goto fail_rindex;
 886         }
 887         return 0;
 888
 889 fail_qinode:
 890         iput(sdp->sd_quota_inode);
 891 fail_rindex:
 892         gfs2_clear_rgrpd(sdp);
 893         iput(sdp->sd_rindex);
 894 fail_statfs:
 895         iput(sdp->sd_statfs_inode);
 896 fail_inum:
 897         iput(sdp->sd_inum_inode);
 898 fail_journal:
 899         init_journal(sdp, UNDO);
 900 fail:
 901         return error;
 902 }
 903
 904 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 905 {
 906         struct inode *pn = NULL;
 907         char buf[30];
 908         int error = 0;
 909         struct gfs2_inode *ip;
 910         struct inode *master = sdp->sd_master_dir->d_inode;
 911
 912         if (sdp->sd_args.ar_spectator)
 913                 return 0;
 914
 915         if (undo)
 916                 goto fail_qc_gh;
 917
 918         pn = gfs2_lookup_simple(master, "per_node");
 919         if (IS_ERR(pn)) {
 920                 error = PTR_ERR(pn);
 921                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 922                 return error;
 923         }
 924
 925         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 926         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 927         if (IS_ERR(sdp->sd_ir_inode)) {
 928                 error = PTR_ERR(sdp->sd_ir_inode);
 929                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 930                 goto fail;
 931         }
 932
 933         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 934         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 935         if (IS_ERR(sdp->sd_sc_inode)) {
 936                 error = PTR_ERR(sdp->sd_sc_inode);
 937                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 938                 goto fail_ir_i;
 939         }
 940
 941         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 942         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 943         if (IS_ERR(sdp->sd_qc_inode)) {
 944                 error = PTR_ERR(sdp->sd_qc_inode);
 945                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 946                 goto fail_ut_i;
 947         }
 948
 949         iput(pn);
 950         pn = NULL;
 951
 952         ip = GFS2_I(sdp->sd_ir_inode);
 953         error = gfs2_glock_nq_init(ip->i_gl,
 954                                    LM_ST_EXCLUSIVE, 0,
 955                                    &sdp->sd_ir_gh);
 956         if (error) {
 957                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 958                 goto fail_qc_i;
 959         }
 960
 961         ip = GFS2_I(sdp->sd_sc_inode);
 962         error = gfs2_glock_nq_init(ip->i_gl,
 963                                    LM_ST_EXCLUSIVE, 0,
 964                                    &sdp->sd_sc_gh);
 965         if (error) {
 966                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 967                 goto fail_ir_gh;
 968         }
 969
 970         ip = GFS2_I(sdp->sd_qc_inode);
 971         error = gfs2_glock_nq_init(ip->i_gl,
 972                                    LM_ST_EXCLUSIVE, 0,
 973                                    &sdp->sd_qc_gh);
 974         if (error) {
 975                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 976                 goto fail_ut_gh;
 977         }
 978
 979         return 0;
 980
 981 fail_qc_gh:
 982         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 983 fail_ut_gh:
 984         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 985 fail_ir_gh:
 986         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 987 fail_qc_i:
 988         iput(sdp->sd_qc_inode);
 989 fail_ut_i:
 990         iput(sdp->sd_sc_inode);
 991 fail_ir_i:
 992         iput(sdp->sd_ir_inode);
 993 fail:
 994         if (pn)
 995                 iput(pn);
 996         return error;
 997 }
 998
 999 static int init_threads(struct gfs2_sbd *sdp, int undo)
1000 {
1001         struct task_struct *p;
1002         int error = 0;
1003
1004         if (undo)
1005                 goto fail_quotad;
1006
1007         sdp->sd_log_flush_time = jiffies;
1008         sdp->sd_jindex_refresh_time = jiffies;
1009
1010         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1011         error = IS_ERR(p);
1012         if (error) {
1013                 fs_err(sdp, "can't start logd thread: %d\n", error);
1014                 return error;
1015         }
1016         sdp->sd_logd_process = p;
1017
1018         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1019         error = IS_ERR(p);
1020         if (error) {
1021                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1022                 goto fail;
1023         }
1024         sdp->sd_quotad_process = p;
1025
1026         return 0;
1027
1028
1029 fail_quotad:
1030         kthread_stop(sdp->sd_quotad_process);
1031 fail:
1032         kthread_stop(sdp->sd_logd_process);
1033         return error;
1034 }
1035
1036 /**
1037  * gfs2_lm_mount - mount a locking protocol
1038  * @sdp: the filesystem
1039  * @args: mount arguements
1040  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1041  *
1042  * Returns: errno
1043  */
1044
1045 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1046 {
1047         char *proto = sdp->sd_proto_name;
1048         char *table = sdp->sd_table_name;
1049         int flags = LM_MFLAG_CONV_NODROP;
1050         int error;
1051
1052         if (sdp->sd_args.ar_spectator)
1053                 flags |= LM_MFLAG_SPECTATOR;
1054
1055         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1056
1057         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
1058                                      gfs2_glock_cb, sdp,
1059                                      GFS2_MIN_LVB_SIZE, flags,
1060                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
1061         if (error) {
1062                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
1063                         proto, table, sdp->sd_args.ar_hostdata);
1064                 goto out;
1065         }
1066
1067         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
1068             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
1069                                   GFS2_MIN_LVB_SIZE)) {
1070                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1071                 goto out;
1072         }
1073
1074         if (sdp->sd_args.ar_spectator)
1075                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1076         else
1077                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1078                          sdp->sd_lockstruct.ls_jid);
1079
1080         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1081
1082         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
1083             !sdp->sd_args.ar_ignore_local_fs) {
1084                 sdp->sd_args.ar_localflocks = 1;
1085                 sdp->sd_args.ar_localcaching = 1;
1086         }
1087
1088 out:
1089         return error;
1090 }
1091
1092 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1093 {
1094         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
1095                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1096 }
1097
1098 /**
1099  * fill_super - Read in superblock
1100  * @sb: The VFS superblock
1101  * @data: Mount options
1102  * @silent: Don't complain if it's not a GFS2 filesystem
1103  *
1104  * Returns: errno
1105  */
1106
1107 static int fill_super(struct super_block *sb, void *data, int silent)
1108 {
1109         struct gfs2_sbd *sdp;
1110         struct gfs2_holder mount_gh;
1111         int error;
1112
1113         sdp = init_sbd(sb);
1114         if (!sdp) {
1115                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1116                 return -ENOMEM;
1117         }
1118
1119         error = gfs2_mount_args(sdp, (char *)data, 0);
1120         if (error) {
1121                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1122                 goto fail;
1123         }
1124
1125         sb->s_magic = GFS2_MAGIC;
1126         sb->s_op = &gfs2_super_ops;
1127         sb->s_export_op = &gfs2_export_ops;
1128         sb->s_time_gran = 1;
1129         sb->s_maxbytes = MAX_LFS_FILESIZE;
1130
1131         /* Set up the buffer cache and fill in some fake block size values
1132            to allow us to read-in the on-disk superblock. */
1133         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1134         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1135         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1136                                GFS2_BASIC_BLOCK_SHIFT;
1137         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1138
1139         error = init_names(sdp, silent);
1140         if (error)
1141                 goto fail;
1142
1143         gfs2_create_debugfs_file(sdp);
1144
1145         error = gfs2_sys_fs_add(sdp);
1146         if (error)
1147                 goto fail;
1148
1149         error = gfs2_lm_mount(sdp, silent);
1150         if (error)
1151                 goto fail_sys;
1152
1153         error = init_locking(sdp, &mount_gh, DO);
1154         if (error)
1155                 goto fail_lm;
1156
1157         error = init_sb(sdp, silent);
1158         if (error)
1159                 goto fail_locking;
1160
1161         error = init_inodes(sdp, DO);
1162         if (error)
1163                 goto fail_sb;
1164
1165         error = init_per_node(sdp, DO);
1166         if (error)
1167                 goto fail_inodes;
1168
1169         error = gfs2_statfs_init(sdp);
1170         if (error) {
1171                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1172                 goto fail_per_node;
1173         }
1174
1175         error = init_threads(sdp, DO);
1176         if (error)
1177                 goto fail_per_node;
1178
1179         if (!(sb->s_flags & MS_RDONLY)) {
1180                 error = gfs2_make_fs_rw(sdp);
1181                 if (error) {
1182                         fs_err(sdp, "can't make FS RW: %d\n", error);
1183                         goto fail_threads;
1184                 }
1185         }
1186
1187         gfs2_glock_dq_uninit(&mount_gh);
1188
1189         return 0;
1190
1191 fail_threads:
1192         init_threads(sdp, UNDO);
1193 fail_per_node:
1194         init_per_node(sdp, UNDO);
1195 fail_inodes:
1196         init_inodes(sdp, UNDO);
1197 fail_sb:
1198         if (sdp->sd_root_dir)
1199                 dput(sdp->sd_root_dir);
1200         if (sdp->sd_master_dir)
1201                 dput(sdp->sd_master_dir);
1202         sb->s_root = NULL;
1203 fail_locking:
1204         init_locking(sdp, &mount_gh, UNDO);
1205 fail_lm:
1206         gfs2_gl_hash_clear(sdp);
1207         gfs2_lm_unmount(sdp);
1208         while (invalidate_inodes(sb))
1209                 yield();
1210 fail_sys:
1211         gfs2_sys_fs_del(sdp);
1212 fail:
1213         gfs2_delete_debugfs_file(sdp);
1214         kfree(sdp);
1215         sb->s_fs_info = NULL;
1216         return error;
1217 }
1218
1219 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1220                        const char *dev_name, void *data, struct vfsmount *mnt)
1221 {
1222         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1223 }
1224
1225 static struct super_block *get_gfs2_sb(const char *dev_name)
1226 {
1227         struct super_block *sb;
1228         struct nameidata nd;
1229         int error;
1230
1231         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1232         if (error) {
1233                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1234                        dev_name, error);
1235                 return NULL;
1236         }
1237         sb = nd.path.dentry->d_inode->i_sb;
1238         if (sb && (sb->s_type == &gfs2_fs_type))
1239                 atomic_inc(&sb->s_active);
1240         else
1241                 sb = NULL;
1242         path_put(&nd.path);
1243         return sb;
1244 }
1245
1246 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1247                             const char *dev_name, void *data, struct vfsmount *mnt)
1248 {
1249         struct super_block *sb = NULL;
1250         struct gfs2_sbd *sdp;
1251
1252         sb = get_gfs2_sb(dev_name);
1253         if (!sb) {
1254                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1255                 return -ENOENT;
1256         }
1257         sdp = sb->s_fs_info;
1258         mnt->mnt_sb = sb;
1259         mnt->mnt_root = dget(sdp->sd_master_dir);
1260         return 0;
1261 }
1262
1263 static void gfs2_kill_sb(struct super_block *sb)
1264 {
1265         struct gfs2_sbd *sdp = sb->s_fs_info;
1266
1267         if (sdp == NULL) {
1268                 kill_block_super(sb);
1269                 return;
1270         }
1271
1272         gfs2_meta_syncfs(sdp);
1273         dput(sdp->sd_root_dir);
1274         dput(sdp->sd_master_dir);
1275         sdp->sd_root_dir = NULL;
1276         sdp->sd_master_dir = NULL;
1277         shrink_dcache_sb(sb);
1278         kill_block_super(sb);
1279         gfs2_delete_debugfs_file(sdp);
1280         kfree(sdp);
1281 }
1282
1283 struct file_system_type gfs2_fs_type = {
1284         .name = "gfs2",
1285         .fs_flags = FS_REQUIRES_DEV,
1286         .get_sb = gfs2_get_sb,
1287         .kill_sb = gfs2_kill_sb,
1288         .owner = THIS_MODULE,
1289 };
1290
1291 struct file_system_type gfs2meta_fs_type = {
1292         .name = "gfs2meta",
1293         .fs_flags = FS_REQUIRES_DEV,
1294         .get_sb = gfs2_get_sb_meta,
1295         .owner = THIS_MODULE,
1296 };
1297