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
  21 #include "gfs2.h"
  22 #include "incore.h"
  23 #include "bmap.h"
  24 #include "glock.h"
  25 #include "glops.h"
  26 #include "inode.h"
  27 #include "recovery.h"
  28 #include "rgrp.h"
  29 #include "super.h"
  30 #include "sys.h"
  31 #include "util.h"
  32 #include "log.h"
  33 #include "quota.h"
  34 #include "dir.h"
  35
  36 #define DO 0
  37 #define UNDO 1
  38
  39 static const u32 gfs2_old_fs_formats[] = {
  40         0
  41 };
  42
  43 static const u32 gfs2_old_multihost_formats[] = {
  44         0
  45 };
  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->gt_spin);
  56
  57         gt->gt_incore_log_blocks = 1024;
  58         gt->gt_log_flush_secs = 60;
  59         gt->gt_recoverd_secs = 60;
  60         gt->gt_logd_secs = 1;
  61         gt->gt_quota_simul_sync = 64;
  62         gt->gt_quota_warn_period = 10;
  63         gt->gt_quota_scale_num = 1;
  64         gt->gt_quota_scale_den = 1;
  65         gt->gt_quota_quantum = 60;
  66         gt->gt_new_files_jdata = 0;
  67         gt->gt_max_readahead = 1 << 18;
  68         gt->gt_stall_secs = 600;
  69         gt->gt_complain_secs = 10;
  70         gt->gt_statfs_quantum = 30;
  71         gt->gt_statfs_slow = 0;
  72 }
  73
  74 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  75 {
  76         struct gfs2_sbd *sdp;
  77
  78         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  79         if (!sdp)
  80                 return NULL;
  81
  82         sb->s_fs_info = sdp;
  83         sdp->sd_vfs = sb;
  84
  85         gfs2_tune_init(&sdp->sd_tune);
  86
  87         mutex_init(&sdp->sd_inum_mutex);
  88         spin_lock_init(&sdp->sd_statfs_spin);
  89
  90         spin_lock_init(&sdp->sd_rindex_spin);
  91         mutex_init(&sdp->sd_rindex_mutex);
  92         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  93         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  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
  99         INIT_LIST_HEAD(&sdp->sd_quota_list);
 100         mutex_init(&sdp->sd_quota_mutex);
 101         init_waitqueue_head(&sdp->sd_quota_wait);
 102         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 103         spin_lock_init(&sdp->sd_trunc_lock);
 104
 105         spin_lock_init(&sdp->sd_log_lock);
 106
 107         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 108         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 109         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 110         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 111         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 112
 113         mutex_init(&sdp->sd_log_reserve_mutex);
 114         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 115         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 116
 117         init_rwsem(&sdp->sd_log_flush_lock);
 118         atomic_set(&sdp->sd_log_in_flight, 0);
 119         init_waitqueue_head(&sdp->sd_log_flush_wait);
 120
 121         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 122
 123         mutex_init(&sdp->sd_freeze_lock);
 124
 125         return sdp;
 126 }
 127
 128
 129 /**
 130  * gfs2_check_sb - Check superblock
 131  * @sdp: the filesystem
 132  * @sb: The superblock
 133  * @silent: Don't print a message if the check fails
 134  *
 135  * Checks the version code of the FS is one that we understand how to
 136  * read and that the sizes of the various on-disk structures have not
 137  * changed.
 138  */
 139
 140 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 141 {
 142         unsigned int x;
 143
 144         if (sb->sb_magic != GFS2_MAGIC ||
 145             sb->sb_type != GFS2_METATYPE_SB) {
 146                 if (!silent)
 147                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 148                 return -EINVAL;
 149         }
 150
 151         /*  If format numbers match exactly, we're done.  */
 152
 153         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 154             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 155                 return 0;
 156
 157         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 158                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 159                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 160                                 break;
 161
 162                 if (!gfs2_old_fs_formats[x]) {
 163                         printk(KERN_WARNING
 164                                "GFS2: code version (%u, %u) is incompatible "
 165                                "with ondisk format (%u, %u)\n",
 166                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 167                                sb->sb_fs_format, sb->sb_multihost_format);
 168                         printk(KERN_WARNING
 169                                "GFS2: I don't know how to upgrade this FS\n");
 170                         return -EINVAL;
 171                 }
 172         }
 173
 174         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 175                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 176                         if (gfs2_old_multihost_formats[x] ==
 177                             sb->sb_multihost_format)
 178                                 break;
 179
 180                 if (!gfs2_old_multihost_formats[x]) {
 181                         printk(KERN_WARNING
 182                                "GFS2: code version (%u, %u) is incompatible "
 183                                "with ondisk format (%u, %u)\n",
 184                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 185                                sb->sb_fs_format, sb->sb_multihost_format);
 186                         printk(KERN_WARNING
 187                                "GFS2: I don't know how to upgrade this FS\n");
 188                         return -EINVAL;
 189                 }
 190         }
 191
 192         if (!sdp->sd_args.ar_upgrade) {
 193                 printk(KERN_WARNING
 194                        "GFS2: code version (%u, %u) is incompatible "
 195                        "with ondisk format (%u, %u)\n",
 196                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 197                        sb->sb_fs_format, sb->sb_multihost_format);
 198                 printk(KERN_INFO
 199                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 200                        "the FS\n");
 201                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 202                 return -EINVAL;
 203         }
 204
 205         return 0;
 206 }
 207
 208 static void end_bio_io_page(struct bio *bio, int error)
 209 {
 210         struct page *page = bio->bi_private;
 211
 212         if (!error)
 213                 SetPageUptodate(page);
 214         else
 215                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 216         unlock_page(page);
 217 }
 218
 219 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 220 {
 221         const struct gfs2_sb *str = buf;
 222
 223         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 224         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 225         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 226         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 227         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 228         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 229         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 230         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 231         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 232         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 233         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 234
 235         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 236         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 237         memcpy(sb->sb_uuid, str->sb_uuid, 16);
 238 }
 239
 240 /**
 241  * gfs2_read_super - Read the gfs2 super block from disk
 242  * @sdp: The GFS2 super block
 243  * @sector: The location of the super block
 244  * @error: The error code to return
 245  *
 246  * This uses the bio functions to read the super block from disk
 247  * because we want to be 100% sure that we never read cached data.
 248  * A super block is read twice only during each GFS2 mount and is
 249  * never written to by the filesystem. The first time its read no
 250  * locks are held, and the only details which are looked at are those
 251  * relating to the locking protocol. Once locking is up and working,
 252  * the sb is read again under the lock to establish the location of
 253  * the master directory (contains pointers to journals etc) and the
 254  * root directory.
 255  *
 256  * Returns: 0 on success or error
 257  */
 258
 259 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 260 {
 261         struct super_block *sb = sdp->sd_vfs;
 262         struct gfs2_sb *p;
 263         struct page *page;
 264         struct bio *bio;
 265
 266         page = alloc_page(GFP_NOFS);
 267         if (unlikely(!page))
 268                 return -ENOBUFS;
 269
 270         ClearPageUptodate(page);
 271         ClearPageDirty(page);
 272         lock_page(page);
 273
 274         bio = bio_alloc(GFP_NOFS, 1);
 275         if (unlikely(!bio)) {
 276                 __free_page(page);
 277                 return -ENOBUFS;
 278         }
 279
 280         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 281         bio->bi_bdev = sb->s_bdev;
 282         bio_add_page(bio, page, PAGE_SIZE, 0);
 283
 284         bio->bi_end_io = end_bio_io_page;
 285         bio->bi_private = page;
 286         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 287         wait_on_page_locked(page);
 288         bio_put(bio);
 289         if (!PageUptodate(page)) {
 290                 __free_page(page);
 291                 return -EIO;
 292         }
 293         p = kmap(page);
 294         gfs2_sb_in(&sdp->sd_sb, p);
 295         kunmap(page);
 296         __free_page(page);
 297         return 0;
 298 }
 299
 300 /**
 301  * gfs2_read_sb - Read super block
 302  * @sdp: The GFS2 superblock
 303  * @silent: Don't print message if mount fails
 304  *
 305  */
 306
 307 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 308 {
 309         u32 hash_blocks, ind_blocks, leaf_blocks;
 310         u32 tmp_blocks;
 311         unsigned int x;
 312         int error;
 313
 314         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 315         if (error) {
 316                 if (!silent)
 317                         fs_err(sdp, "can't read superblock\n");
 318                 return error;
 319         }
 320
 321         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 322         if (error)
 323                 return error;
 324
 325         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 326                                GFS2_BASIC_BLOCK_SHIFT;
 327         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 328         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 329                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 330         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 331                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 332         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 333         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 334         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 335         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 336         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 337                                 sizeof(struct gfs2_meta_header)) /
 338                                 sizeof(struct gfs2_quota_change);
 339
 340         /* Compute maximum reservation required to add a entry to a directory */
 341
 342         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 343                              sdp->sd_jbsize);
 344
 345         ind_blocks = 0;
 346         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 347                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 348                 ind_blocks += tmp_blocks;
 349         }
 350
 351         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 352
 353         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 354
 355         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 356                                 sizeof(struct gfs2_dinode);
 357         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 358         for (x = 2;; x++) {
 359                 u64 space, d;
 360                 u32 m;
 361
 362                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 363                 d = space;
 364                 m = do_div(d, sdp->sd_inptrs);
 365
 366                 if (d != sdp->sd_heightsize[x - 1] || m)
 367                         break;
 368                 sdp->sd_heightsize[x] = space;
 369         }
 370         sdp->sd_max_height = x;
 371         sdp->sd_heightsize[x] = ~0;
 372         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 373
 374         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 375                                  sizeof(struct gfs2_dinode);
 376         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 377         for (x = 2;; x++) {
 378                 u64 space, d;
 379                 u32 m;
 380
 381                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 382                 d = space;
 383                 m = do_div(d, sdp->sd_inptrs);
 384
 385                 if (d != sdp->sd_jheightsize[x - 1] || m)
 386                         break;
 387                 sdp->sd_jheightsize[x] = space;
 388         }
 389         sdp->sd_max_jheight = x;
 390         sdp->sd_jheightsize[x] = ~0;
 391         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 392
 393         return 0;
 394 }
 395
 396 static int init_names(struct gfs2_sbd *sdp, int silent)
 397 {
 398         char *proto, *table;
 399         int error = 0;
 400
 401         proto = sdp->sd_args.ar_lockproto;
 402         table = sdp->sd_args.ar_locktable;
 403
 404         /*  Try to autodetect  */
 405
 406         if (!proto[0] || !table[0]) {
 407                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 408                 if (error)
 409                         return error;
 410
 411                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 412                 if (error)
 413                         goto out;
 414
 415                 if (!proto[0])
 416                         proto = sdp->sd_sb.sb_lockproto;
 417                 if (!table[0])
 418                         table = sdp->sd_sb.sb_locktable;
 419         }
 420
 421         if (!table[0])
 422                 table = sdp->sd_vfs->s_id;
 423
 424         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 425         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 426
 427         table = sdp->sd_table_name;
 428         while ((table = strchr(table, '/')))
 429                 *table = '_';
 430
 431 out:
 432         return error;
 433 }
 434
 435 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 436                         int undo)
 437 {
 438         int error = 0;
 439
 440         if (undo)
 441                 goto fail_trans;
 442
 443         error = gfs2_glock_nq_num(sdp,
 444                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 445                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 446                                   mount_gh);
 447         if (error) {
 448                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 449                 goto fail;
 450         }
 451
 452         error = gfs2_glock_nq_num(sdp,
 453                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 454                                   LM_ST_SHARED,
 455                                   LM_FLAG_NOEXP | GL_EXACT,
 456                                   &sdp->sd_live_gh);
 457         if (error) {
 458                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 459                 goto fail_mount;
 460         }
 461
 462         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 463                                CREATE, &sdp->sd_rename_gl);
 464         if (error) {
 465                 fs_err(sdp, "can't create rename glock: %d\n", error);
 466                 goto fail_live;
 467         }
 468
 469         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 470                                CREATE, &sdp->sd_trans_gl);
 471         if (error) {
 472                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 473                 goto fail_rename;
 474         }
 475
 476         return 0;
 477
 478 fail_trans:
 479         gfs2_glock_put(sdp->sd_trans_gl);
 480 fail_rename:
 481         gfs2_glock_put(sdp->sd_rename_gl);
 482 fail_live:
 483         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 484 fail_mount:
 485         gfs2_glock_dq_uninit(mount_gh);
 486 fail:
 487         return error;
 488 }
 489
 490 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 491                             u64 no_addr, const char *name)
 492 {
 493         struct gfs2_sbd *sdp = sb->s_fs_info;
 494         struct dentry *dentry;
 495         struct inode *inode;
 496
 497         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 498         if (IS_ERR(inode)) {
 499                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 500                 return PTR_ERR(inode);
 501         }
 502         dentry = d_alloc_root(inode);
 503         if (!dentry) {
 504                 fs_err(sdp, "can't alloc %s dentry\n", name);
 505                 iput(inode);
 506                 return -ENOMEM;
 507         }
 508         dentry->d_op = &gfs2_dops;
 509         *dptr = dentry;
 510         return 0;
 511 }
 512
 513 static int init_sb(struct gfs2_sbd *sdp, int silent)
 514 {
 515         struct super_block *sb = sdp->sd_vfs;
 516         struct gfs2_holder sb_gh;
 517         u64 no_addr;
 518         int ret;
 519
 520         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 521                                 LM_ST_SHARED, 0, &sb_gh);
 522         if (ret) {
 523                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 524                 return ret;
 525         }
 526
 527         ret = gfs2_read_sb(sdp, silent);
 528         if (ret) {
 529                 fs_err(sdp, "can't read superblock: %d\n", ret);
 530                 goto out;
 531         }
 532
 533         /* Set up the buffer cache and SB for real */
 534         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 535                 ret = -EINVAL;
 536                 fs_err(sdp, "FS block size (%u) is too small for device "
 537                        "block size (%u)\n",
 538                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 539                 goto out;
 540         }
 541         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 542                 ret = -EINVAL;
 543                 fs_err(sdp, "FS block size (%u) is too big for machine "
 544                        "page size (%u)\n",
 545                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 546                 goto out;
 547         }
 548         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 549
 550         /* Get the root inode */
 551         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 552         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 553         if (ret)
 554                 goto out;
 555
 556         /* Get the master inode */
 557         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 558         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 559         if (ret) {
 560                 dput(sdp->sd_root_dir);
 561                 goto out;
 562         }
 563         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 564 out:
 565         gfs2_glock_dq_uninit(&sb_gh);
 566         return ret;
 567 }
 568
 569 /**
 570  * map_journal_extents - create a reusable "extent" mapping from all logical
 571  * blocks to all physical blocks for the given journal.  This will save
 572  * us time when writing journal blocks.  Most journals will have only one
 573  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 574  * arranges the journal blocks sequentially to maximize performance.
 575  * So the extent would map the first block for the entire file length.
 576  * However, gfs2_jadd can happen while file activity is happening, so
 577  * those journals may not be sequential.  Less likely is the case where
 578  * the users created their own journals by mounting the metafs and
 579  * laying it out.  But it's still possible.  These journals might have
 580  * several extents.
 581  *
 582  * TODO: This should be done in bigger chunks rather than one block at a time,
 583  *       but since it's only done at mount time, I'm not worried about the
 584  *       time it takes.
 585  */
 586 static int map_journal_extents(struct gfs2_sbd *sdp)
 587 {
 588         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 589         unsigned int lb;
 590         u64 db, prev_db; /* logical block, disk block, prev disk block */
 591         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 592         struct gfs2_journal_extent *jext = NULL;
 593         struct buffer_head bh;
 594         int rc = 0;
 595
 596         prev_db = 0;
 597
 598         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 599                 bh.b_state = 0;
 600                 bh.b_blocknr = 0;
 601                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 602                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 603                 db = bh.b_blocknr;
 604                 if (rc || !db) {
 605                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 606                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 607                         break;
 608                 }
 609                 if (!prev_db || db != prev_db + 1) {
 610                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 611                                        GFP_KERNEL);
 612                         if (!jext) {
 613                                 printk(KERN_INFO "GFS2 error: out of memory "
 614                                        "mapping journal extents.\n");
 615                                 rc = -ENOMEM;
 616                                 break;
 617                         }
 618                         jext->dblock = db;
 619                         jext->lblock = lb;
 620                         jext->blocks = 1;
 621                         list_add_tail(&jext->extent_list, &jd->extent_list);
 622                 } else {
 623                         jext->blocks++;
 624                 }
 625                 prev_db = db;
 626         }
 627         return rc;
 628 }
 629
 630 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 631 {
 632         char *message = "FIRSTMOUNT=Done";
 633         char *envp[] = { message, NULL };
 634         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 635         ls->ls_first_done = 1;
 636         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 637 }
 638
 639 /**
 640  * gfs2_jindex_hold - Grab a lock on the jindex
 641  * @sdp: The GFS2 superblock
 642  * @ji_gh: the holder for the jindex glock
 643  *
 644  * Returns: errno
 645  */
 646
 647 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 648 {
 649         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 650         struct qstr name;
 651         char buf[20];
 652         struct gfs2_jdesc *jd;
 653         int error;
 654
 655         name.name = buf;
 656
 657         mutex_lock(&sdp->sd_jindex_mutex);
 658
 659         for (;;) {
 660                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 661                 if (error)
 662                         break;
 663
 664                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 665                 name.hash = gfs2_disk_hash(name.name, name.len);
 666
 667                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 668                 if (error == -ENOENT) {
 669                         error = 0;
 670                         break;
 671                 }
 672
 673                 gfs2_glock_dq_uninit(ji_gh);
 674
 675                 if (error)
 676                         break;
 677
 678                 error = -ENOMEM;
 679                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 680                 if (!jd)
 681                         break;
 682
 683                 INIT_LIST_HEAD(&jd->extent_list);
 684                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 685                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 686                         if (!jd->jd_inode)
 687                                 error = -ENOENT;
 688                         else
 689                                 error = PTR_ERR(jd->jd_inode);
 690                         kfree(jd);
 691                         break;
 692                 }
 693
 694                 spin_lock(&sdp->sd_jindex_spin);
 695                 jd->jd_jid = sdp->sd_journals++;
 696                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 697                 spin_unlock(&sdp->sd_jindex_spin);
 698         }
 699
 700         mutex_unlock(&sdp->sd_jindex_mutex);
 701
 702         return error;
 703 }
 704
 705 static int init_journal(struct gfs2_sbd *sdp, int undo)
 706 {
 707         struct inode *master = sdp->sd_master_dir->d_inode;
 708         struct gfs2_holder ji_gh;
 709         struct task_struct *p;
 710         struct gfs2_inode *ip;
 711         int jindex = 1;
 712         int error = 0;
 713
 714         if (undo) {
 715                 jindex = 0;
 716                 goto fail_recoverd;
 717         }
 718
 719         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 720         if (IS_ERR(sdp->sd_jindex)) {
 721                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 722                 return PTR_ERR(sdp->sd_jindex);
 723         }
 724         ip = GFS2_I(sdp->sd_jindex);
 725
 726         /* Load in the journal index special file */
 727
 728         error = gfs2_jindex_hold(sdp, &ji_gh);
 729         if (error) {
 730                 fs_err(sdp, "can't read journal index: %d\n", error);
 731                 goto fail;
 732         }
 733
 734         error = -EINVAL;
 735         if (!gfs2_jindex_size(sdp)) {
 736                 fs_err(sdp, "no journals!\n");
 737                 goto fail_jindex;
 738         }
 739
 740         if (sdp->sd_args.ar_spectator) {
 741                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 742                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 743         } else {
 744                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 745                         fs_err(sdp, "can't mount journal #%u\n",
 746                                sdp->sd_lockstruct.ls_jid);
 747                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 748                                gfs2_jindex_size(sdp),
 749                                gfs2_jindex_size(sdp) - 1);
 750                         goto fail_jindex;
 751                 }
 752                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 753
 754                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 755                                           &gfs2_journal_glops,
 756                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 757                                           &sdp->sd_journal_gh);
 758                 if (error) {
 759                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 760                         goto fail_jindex;
 761                 }
 762
 763                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 764                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 765                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 766                                            &sdp->sd_jinode_gh);
 767                 if (error) {
 768                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 769                                error);
 770                         goto fail_journal_gh;
 771                 }
 772
 773                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 774                 if (error) {
 775                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 776                                sdp->sd_jdesc->jd_jid, error);
 777                         goto fail_jinode_gh;
 778                 }
 779                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 780
 781                 /* Map the extents for this journal's blocks */
 782                 map_journal_extents(sdp);
 783         }
 784
 785         if (sdp->sd_lockstruct.ls_first) {
 786                 unsigned int x;
 787                 for (x = 0; x < sdp->sd_journals; x++) {
 788                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 789                         if (error) {
 790                                 fs_err(sdp, "error recovering journal %u: %d\n",
 791                                        x, error);
 792                                 goto fail_jinode_gh;
 793                         }
 794                 }
 795
 796                 gfs2_others_may_mount(sdp);
 797         } else if (!sdp->sd_args.ar_spectator) {
 798                 error = gfs2_recover_journal(sdp->sd_jdesc);
 799                 if (error) {
 800                         fs_err(sdp, "error recovering my journal: %d\n", error);
 801                         goto fail_jinode_gh;
 802                 }
 803         }
 804
 805         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 806         gfs2_glock_dq_uninit(&ji_gh);
 807         jindex = 0;
 808
 809         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 810         error = IS_ERR(p);
 811         if (error) {
 812                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 813                 goto fail_jinode_gh;
 814         }
 815         sdp->sd_recoverd_process = p;
 816
 817         return 0;
 818
 819 fail_recoverd:
 820         kthread_stop(sdp->sd_recoverd_process);
 821 fail_jinode_gh:
 822         if (!sdp->sd_args.ar_spectator)
 823                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 824 fail_journal_gh:
 825         if (!sdp->sd_args.ar_spectator)
 826                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 827 fail_jindex:
 828         gfs2_jindex_free(sdp);
 829         if (jindex)
 830                 gfs2_glock_dq_uninit(&ji_gh);
 831 fail:
 832         iput(sdp->sd_jindex);
 833         return error;
 834 }
 835
 836
 837 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 838 {
 839         int error = 0;
 840         struct gfs2_inode *ip;
 841         struct inode *master = sdp->sd_master_dir->d_inode;
 842
 843         if (undo)
 844                 goto fail_qinode;
 845
 846         error = init_journal(sdp, undo);
 847         if (error)
 848                 goto fail;
 849
 850         /* Read in the master inode number inode */
 851         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 852         if (IS_ERR(sdp->sd_inum_inode)) {
 853                 error = PTR_ERR(sdp->sd_inum_inode);
 854                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 855                 goto fail_journal;
 856         }
 857
 858
 859         /* Read in the master statfs inode */
 860         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 861         if (IS_ERR(sdp->sd_statfs_inode)) {
 862                 error = PTR_ERR(sdp->sd_statfs_inode);
 863                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 864                 goto fail_inum;
 865         }
 866
 867         /* Read in the resource index inode */
 868         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 869         if (IS_ERR(sdp->sd_rindex)) {
 870                 error = PTR_ERR(sdp->sd_rindex);
 871                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 872                 goto fail_statfs;
 873         }
 874         ip = GFS2_I(sdp->sd_rindex);
 875         sdp->sd_rindex_uptodate = 0;
 876
 877         /* Read in the quota inode */
 878         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 879         if (IS_ERR(sdp->sd_quota_inode)) {
 880                 error = PTR_ERR(sdp->sd_quota_inode);
 881                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 882                 goto fail_rindex;
 883         }
 884         return 0;
 885
 886 fail_qinode:
 887         iput(sdp->sd_quota_inode);
 888 fail_rindex:
 889         gfs2_clear_rgrpd(sdp);
 890         iput(sdp->sd_rindex);
 891 fail_statfs:
 892         iput(sdp->sd_statfs_inode);
 893 fail_inum:
 894         iput(sdp->sd_inum_inode);
 895 fail_journal:
 896         init_journal(sdp, UNDO);
 897 fail:
 898         return error;
 899 }
 900
 901 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 902 {
 903         struct inode *pn = NULL;
 904         char buf[30];
 905         int error = 0;
 906         struct gfs2_inode *ip;
 907         struct inode *master = sdp->sd_master_dir->d_inode;
 908
 909         if (sdp->sd_args.ar_spectator)
 910                 return 0;
 911
 912         if (undo)
 913                 goto fail_qc_gh;
 914
 915         pn = gfs2_lookup_simple(master, "per_node");
 916         if (IS_ERR(pn)) {
 917                 error = PTR_ERR(pn);
 918                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 919                 return error;
 920         }
 921
 922         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 923         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 924         if (IS_ERR(sdp->sd_ir_inode)) {
 925                 error = PTR_ERR(sdp->sd_ir_inode);
 926                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 927                 goto fail;
 928         }
 929
 930         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 931         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 932         if (IS_ERR(sdp->sd_sc_inode)) {
 933                 error = PTR_ERR(sdp->sd_sc_inode);
 934                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 935                 goto fail_ir_i;
 936         }
 937
 938         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 939         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 940         if (IS_ERR(sdp->sd_qc_inode)) {
 941                 error = PTR_ERR(sdp->sd_qc_inode);
 942                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 943                 goto fail_ut_i;
 944         }
 945
 946         iput(pn);
 947         pn = NULL;
 948
 949         ip = GFS2_I(sdp->sd_ir_inode);
 950         error = gfs2_glock_nq_init(ip->i_gl,
 951                                    LM_ST_EXCLUSIVE, 0,
 952                                    &sdp->sd_ir_gh);
 953         if (error) {
 954                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 955                 goto fail_qc_i;
 956         }
 957
 958         ip = GFS2_I(sdp->sd_sc_inode);
 959         error = gfs2_glock_nq_init(ip->i_gl,
 960                                    LM_ST_EXCLUSIVE, 0,
 961                                    &sdp->sd_sc_gh);
 962         if (error) {
 963                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 964                 goto fail_ir_gh;
 965         }
 966
 967         ip = GFS2_I(sdp->sd_qc_inode);
 968         error = gfs2_glock_nq_init(ip->i_gl,
 969                                    LM_ST_EXCLUSIVE, 0,
 970                                    &sdp->sd_qc_gh);
 971         if (error) {
 972                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 973                 goto fail_ut_gh;
 974         }
 975
 976         return 0;
 977
 978 fail_qc_gh:
 979         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 980 fail_ut_gh:
 981         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 982 fail_ir_gh:
 983         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 984 fail_qc_i:
 985         iput(sdp->sd_qc_inode);
 986 fail_ut_i:
 987         iput(sdp->sd_sc_inode);
 988 fail_ir_i:
 989         iput(sdp->sd_ir_inode);
 990 fail:
 991         if (pn)
 992                 iput(pn);
 993         return error;
 994 }
 995
 996 static int init_threads(struct gfs2_sbd *sdp, int undo)
 997 {
 998         struct task_struct *p;
 999         int error = 0;
1000
1001         if (undo)
1002                 goto fail_quotad;
1003
1004         sdp->sd_log_flush_time = jiffies;
1005
1006         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1007         error = IS_ERR(p);
1008         if (error) {
1009                 fs_err(sdp, "can't start logd thread: %d\n", error);
1010                 return error;
1011         }
1012         sdp->sd_logd_process = p;
1013
1014         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1015         error = IS_ERR(p);
1016         if (error) {
1017                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1018                 goto fail;
1019         }
1020         sdp->sd_quotad_process = p;
1021
1022         return 0;
1023
1024
1025 fail_quotad:
1026         kthread_stop(sdp->sd_quotad_process);
1027 fail:
1028         kthread_stop(sdp->sd_logd_process);
1029         return error;
1030 }
1031
1032 static const match_table_t nolock_tokens = {
1033         { Opt_jid, "jid=%d\n", },
1034         { Opt_err, NULL },
1035 };
1036
1037 static const struct lm_lockops nolock_ops = {
1038         .lm_proto_name = "lock_nolock",
1039         .lm_put_lock = kmem_cache_free,
1040         .lm_tokens = &nolock_tokens,
1041 };
1042
1043 /**
1044  * gfs2_lm_mount - mount a locking protocol
1045  * @sdp: the filesystem
1046  * @args: mount arguements
1047  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1048  *
1049  * Returns: errno
1050  */
1051
1052 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1053 {
1054         const struct lm_lockops *lm;
1055         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1056         struct gfs2_args *args = &sdp->sd_args;
1057         const char *proto = sdp->sd_proto_name;
1058         const char *table = sdp->sd_table_name;
1059         const char *fsname;
1060         char *o, *options;
1061         int ret;
1062
1063         if (!strcmp("lock_nolock", proto)) {
1064                 lm = &nolock_ops;
1065                 sdp->sd_args.ar_localflocks = 1;
1066                 sdp->sd_args.ar_localcaching = 1;
1067 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1068         } else if (!strcmp("lock_dlm", proto)) {
1069                 lm = &gfs2_dlm_ops;
1070 #endif
1071         } else {
1072                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1073                 return -ENOENT;
1074         }
1075
1076         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1077
1078         ls->ls_ops = lm;
1079         ls->ls_first = 1;
1080         ls->ls_id = 0;
1081
1082         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1083                 substring_t tmp[MAX_OPT_ARGS];
1084                 int token, option;
1085
1086                 if (!o || !*o)
1087                         continue;
1088
1089                 token = match_token(o, *lm->lm_tokens, tmp);
1090                 switch (token) {
1091                 case Opt_jid:
1092                         ret = match_int(&tmp[0], &option);
1093                         if (ret || option < 0)
1094                                 goto hostdata_error;
1095                         ls->ls_jid = option;
1096                         break;
1097                 case Opt_id:
1098                         ret = match_int(&tmp[0], &option);
1099                         if (ret)
1100                                 goto hostdata_error;
1101                         ls->ls_id = option;
1102                         break;
1103                 case Opt_first:
1104                         ret = match_int(&tmp[0], &option);
1105                         if (ret || (option != 0 && option != 1))
1106                                 goto hostdata_error;
1107                         ls->ls_first = option;
1108                         break;
1109                 case Opt_nodir:
1110                         ret = match_int(&tmp[0], &option);
1111                         if (ret || (option != 0 && option != 1))
1112                                 goto hostdata_error;
1113                         ls->ls_nodir = option;
1114                         break;
1115                 case Opt_err:
1116                 default:
1117 hostdata_error:
1118                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1119                         return -EINVAL;
1120                 }
1121         }
1122
1123         if (sdp->sd_args.ar_spectator)
1124                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1125         else
1126                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1127                          sdp->sd_lockstruct.ls_jid);
1128
1129         fsname = strchr(table, ':');
1130         if (fsname)
1131                 fsname++;
1132         if (lm->lm_mount == NULL) {
1133                 fs_info(sdp, "Now mounting FS...\n");
1134                 return 0;
1135         }
1136         ret = lm->lm_mount(sdp, fsname);
1137         if (ret == 0)
1138                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1139         return ret;
1140 }
1141
1142 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1143 {
1144         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1145         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1146             lm->lm_unmount)
1147                 lm->lm_unmount(sdp);
1148 }
1149
1150 /**
1151  * fill_super - Read in superblock
1152  * @sb: The VFS superblock
1153  * @data: Mount options
1154  * @silent: Don't complain if it's not a GFS2 filesystem
1155  *
1156  * Returns: errno
1157  */
1158
1159 static int fill_super(struct super_block *sb, void *data, int silent)
1160 {
1161         struct gfs2_sbd *sdp;
1162         struct gfs2_holder mount_gh;
1163         int error;
1164
1165         sdp = init_sbd(sb);
1166         if (!sdp) {
1167                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1168                 return -ENOMEM;
1169         }
1170
1171         sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1172         sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1173
1174         error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1175         if (error) {
1176                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1177                 goto fail;
1178         }
1179
1180         if (sdp->sd_args.ar_spectator)
1181                 sb->s_flags |= MS_RDONLY;
1182         if (sdp->sd_args.ar_posix_acl)
1183                 sb->s_flags |= MS_POSIXACL;
1184
1185         sb->s_magic = GFS2_MAGIC;
1186         sb->s_op = &gfs2_super_ops;
1187         sb->s_export_op = &gfs2_export_ops;
1188         sb->s_time_gran = 1;
1189         sb->s_maxbytes = MAX_LFS_FILESIZE;
1190
1191         /* Set up the buffer cache and fill in some fake block size values
1192            to allow us to read-in the on-disk superblock. */
1193         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1194         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1195         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1196                                GFS2_BASIC_BLOCK_SHIFT;
1197         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1198
1199         error = init_names(sdp, silent);
1200         if (error)
1201                 goto fail;
1202
1203         gfs2_create_debugfs_file(sdp);
1204
1205         error = gfs2_sys_fs_add(sdp);
1206         if (error)
1207                 goto fail;
1208
1209         error = gfs2_lm_mount(sdp, silent);
1210         if (error)
1211                 goto fail_sys;
1212
1213         error = init_locking(sdp, &mount_gh, DO);
1214         if (error)
1215                 goto fail_lm;
1216
1217         error = init_sb(sdp, silent);
1218         if (error)
1219                 goto fail_locking;
1220
1221         error = init_inodes(sdp, DO);
1222         if (error)
1223                 goto fail_sb;
1224
1225         error = init_per_node(sdp, DO);
1226         if (error)
1227                 goto fail_inodes;
1228
1229         error = gfs2_statfs_init(sdp);
1230         if (error) {
1231                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1232                 goto fail_per_node;
1233         }
1234
1235         error = init_threads(sdp, DO);
1236         if (error)
1237                 goto fail_per_node;
1238
1239         if (!(sb->s_flags & MS_RDONLY)) {
1240                 error = gfs2_make_fs_rw(sdp);
1241                 if (error) {
1242                         fs_err(sdp, "can't make FS RW: %d\n", error);
1243                         goto fail_threads;
1244                 }
1245         }
1246
1247         gfs2_glock_dq_uninit(&mount_gh);
1248
1249         return 0;
1250
1251 fail_threads:
1252         init_threads(sdp, UNDO);
1253 fail_per_node:
1254         init_per_node(sdp, UNDO);
1255 fail_inodes:
1256         init_inodes(sdp, UNDO);
1257 fail_sb:
1258         if (sdp->sd_root_dir)
1259                 dput(sdp->sd_root_dir);
1260         if (sdp->sd_master_dir)
1261                 dput(sdp->sd_master_dir);
1262         if (sb->s_root)
1263                 dput(sb->s_root);
1264         sb->s_root = NULL;
1265 fail_locking:
1266         init_locking(sdp, &mount_gh, UNDO);
1267 fail_lm:
1268         gfs2_gl_hash_clear(sdp);
1269         gfs2_lm_unmount(sdp);
1270         while (invalidate_inodes(sb))
1271                 yield();
1272 fail_sys:
1273         gfs2_sys_fs_del(sdp);
1274 fail:
1275         gfs2_delete_debugfs_file(sdp);
1276         kfree(sdp);
1277         sb->s_fs_info = NULL;
1278         return error;
1279 }
1280
1281 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1282                        const char *dev_name, void *data, struct vfsmount *mnt)
1283 {
1284         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1285 }
1286
1287 static struct super_block *get_gfs2_sb(const char *dev_name)
1288 {
1289         struct super_block *sb;
1290         struct nameidata nd;
1291         int error;
1292
1293         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1294         if (error) {
1295                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1296                        dev_name, error);
1297                 return NULL;
1298         }
1299         sb = nd.path.dentry->d_inode->i_sb;
1300         if (sb && (sb->s_type == &gfs2_fs_type))
1301                 atomic_inc(&sb->s_active);
1302         else
1303                 sb = NULL;
1304         path_put(&nd.path);
1305         return sb;
1306 }
1307
1308 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1309                             const char *dev_name, void *data, struct vfsmount *mnt)
1310 {
1311         struct super_block *sb = NULL;
1312         struct gfs2_sbd *sdp;
1313
1314         sb = get_gfs2_sb(dev_name);
1315         if (!sb) {
1316                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1317                 return -ENOENT;
1318         }
1319         sdp = sb->s_fs_info;
1320         mnt->mnt_sb = sb;
1321         mnt->mnt_root = dget(sdp->sd_master_dir);
1322         return 0;
1323 }
1324
1325 static void gfs2_kill_sb(struct super_block *sb)
1326 {
1327         struct gfs2_sbd *sdp = sb->s_fs_info;
1328
1329         if (sdp == NULL) {
1330                 kill_block_super(sb);
1331                 return;
1332         }
1333
1334         gfs2_meta_syncfs(sdp);
1335         dput(sdp->sd_root_dir);
1336         dput(sdp->sd_master_dir);
1337         sdp->sd_root_dir = NULL;
1338         sdp->sd_master_dir = NULL;
1339         shrink_dcache_sb(sb);
1340         kill_block_super(sb);
1341         gfs2_delete_debugfs_file(sdp);
1342         kfree(sdp);
1343 }
1344
1345 struct file_system_type gfs2_fs_type = {
1346         .name = "gfs2",
1347         .fs_flags = FS_REQUIRES_DEV,
1348         .get_sb = gfs2_get_sb,
1349         .kill_sb = gfs2_kill_sb,
1350         .owner = THIS_MODULE,
1351 };
1352
1353 struct file_system_type gfs2meta_fs_type = {
1354         .name = "gfs2meta",
1355         .fs_flags = FS_REQUIRES_DEV,
1356         .get_sb = gfs2_get_sb_meta,
1357         .owner = THIS_MODULE,
1358 };
1359