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