SAFE public projects git trees. - safe/jmp/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 }
 238
 239 /**
 240  * gfs2_read_super - Read the gfs2 super block from disk
 241  * @sdp: The GFS2 super block
 242  * @sector: The location of the super block
 243  * @error: The error code to return
 244  *
 245  * This uses the bio functions to read the super block from disk
 246  * because we want to be 100% sure that we never read cached data.
 247  * A super block is read twice only during each GFS2 mount and is
 248  * never written to by the filesystem. The first time its read no
 249  * locks are held, and the only details which are looked at are those
 250  * relating to the locking protocol. Once locking is up and working,
 251  * the sb is read again under the lock to establish the location of
 252  * the master directory (contains pointers to journals etc) and the
 253  * root directory.
 254  *
 255  * Returns: 0 on success or error
 256  */
 257
 258 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 259 {
 260         struct super_block *sb = sdp->sd_vfs;
 261         struct gfs2_sb *p;
 262         struct page *page;
 263         struct bio *bio;
 264
 265         page = alloc_page(GFP_NOFS);
 266         if (unlikely(!page))
 267                 return -ENOBUFS;
 268
 269         ClearPageUptodate(page);
 270         ClearPageDirty(page);
 271         lock_page(page);
 272
 273         bio = bio_alloc(GFP_NOFS, 1);
 274         if (unlikely(!bio)) {
 275                 __free_page(page);
 276                 return -ENOBUFS;
 277         }
 278
 279         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 280         bio->bi_bdev = sb->s_bdev;
 281         bio_add_page(bio, page, PAGE_SIZE, 0);
 282
 283         bio->bi_end_io = end_bio_io_page;
 284         bio->bi_private = page;
 285         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 286         wait_on_page_locked(page);
 287         bio_put(bio);
 288         if (!PageUptodate(page)) {
 289                 __free_page(page);
 290                 return -EIO;
 291         }
 292         p = kmap(page);
 293         gfs2_sb_in(&sdp->sd_sb, p);
 294         kunmap(page);
 295         __free_page(page);
 296         return 0;
 297 }
 298 /**
 299  * gfs2_read_sb - Read super block
 300  * @sdp: The GFS2 superblock
 301  * @gl: the glock for the superblock (assumed to be held)
 302  * @silent: Don't print message if mount fails
 303  *
 304  */
 305
 306 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
 307 {
 308         u32 hash_blocks, ind_blocks, leaf_blocks;
 309         u32 tmp_blocks;
 310         unsigned int x;
 311         int error;
 312
 313         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 314         if (error) {
 315                 if (!silent)
 316                         fs_err(sdp, "can't read superblock\n");
 317                 return error;
 318         }
 319
 320         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 321         if (error)
 322                 return error;
 323
 324         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 325                                GFS2_BASIC_BLOCK_SHIFT;
 326         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 327         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 328                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 329         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 330                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 331         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 332         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 333         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 334         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 335         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 336                                 sizeof(struct gfs2_meta_header)) /
 337                                 sizeof(struct gfs2_quota_change);
 338
 339         /* Compute maximum reservation required to add a entry to a directory */
 340
 341         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 342                              sdp->sd_jbsize);
 343
 344         ind_blocks = 0;
 345         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 346                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 347                 ind_blocks += tmp_blocks;
 348         }
 349
 350         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 351
 352         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 353
 354         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 355                                 sizeof(struct gfs2_dinode);
 356         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 357         for (x = 2;; x++) {
 358                 u64 space, d;
 359                 u32 m;
 360
 361                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 362                 d = space;
 363                 m = do_div(d, sdp->sd_inptrs);
 364
 365                 if (d != sdp->sd_heightsize[x - 1] || m)
 366                         break;
 367                 sdp->sd_heightsize[x] = space;
 368         }
 369         sdp->sd_max_height = x;
 370         sdp->sd_heightsize[x] = ~0;
 371         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 372
 373         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 374                                  sizeof(struct gfs2_dinode);
 375         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 376         for (x = 2;; x++) {
 377                 u64 space, d;
 378                 u32 m;
 379
 380                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 381                 d = space;
 382                 m = do_div(d, sdp->sd_inptrs);
 383
 384                 if (d != sdp->sd_jheightsize[x - 1] || m)
 385                         break;
 386                 sdp->sd_jheightsize[x] = space;
 387         }
 388         sdp->sd_max_jheight = x;
 389         sdp->sd_jheightsize[x] = ~0;
 390         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 391
 392         return 0;
 393 }
 394
 395 static int init_names(struct gfs2_sbd *sdp, int silent)
 396 {
 397         char *proto, *table;
 398         int error = 0;
 399
 400         proto = sdp->sd_args.ar_lockproto;
 401         table = sdp->sd_args.ar_locktable;
 402
 403         /*  Try to autodetect  */
 404
 405         if (!proto[0] || !table[0]) {
 406                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 407                 if (error)
 408                         return error;
 409
 410                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 411                 if (error)
 412                         goto out;
 413
 414                 if (!proto[0])
 415                         proto = sdp->sd_sb.sb_lockproto;
 416                 if (!table[0])
 417                         table = sdp->sd_sb.sb_locktable;
 418         }
 419
 420         if (!table[0])
 421                 table = sdp->sd_vfs->s_id;
 422
 423         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 424         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 425
 426         table = sdp->sd_table_name;
 427         while ((table = strchr(table, '/')))
 428                 *table = '_';
 429
 430 out:
 431         return error;
 432 }
 433
 434 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 435                         int undo)
 436 {
 437         int error = 0;
 438
 439         if (undo)
 440                 goto fail_trans;
 441
 442         error = gfs2_glock_nq_num(sdp,
 443                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 444                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 445                                   mount_gh);
 446         if (error) {
 447                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 448                 goto fail;
 449         }
 450
 451         error = gfs2_glock_nq_num(sdp,
 452                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 453                                   LM_ST_SHARED,
 454                                   LM_FLAG_NOEXP | GL_EXACT,
 455                                   &sdp->sd_live_gh);
 456         if (error) {
 457                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 458                 goto fail_mount;
 459         }
 460
 461         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 462                                CREATE, &sdp->sd_rename_gl);
 463         if (error) {
 464                 fs_err(sdp, "can't create rename glock: %d\n", error);
 465                 goto fail_live;
 466         }
 467
 468         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 469                                CREATE, &sdp->sd_trans_gl);
 470         if (error) {
 471                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 472                 goto fail_rename;
 473         }
 474
 475         return 0;
 476
 477 fail_trans:
 478         gfs2_glock_put(sdp->sd_trans_gl);
 479 fail_rename:
 480         gfs2_glock_put(sdp->sd_rename_gl);
 481 fail_live:
 482         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 483 fail_mount:
 484         gfs2_glock_dq_uninit(mount_gh);
 485 fail:
 486         return error;
 487 }
 488
 489 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 490                             u64 no_addr, const char *name)
 491 {
 492         struct gfs2_sbd *sdp = sb->s_fs_info;
 493         struct dentry *dentry;
 494         struct inode *inode;
 495
 496         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 497         if (IS_ERR(inode)) {
 498                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 499                 return PTR_ERR(inode);
 500         }
 501         dentry = d_alloc_root(inode);
 502         if (!dentry) {
 503                 fs_err(sdp, "can't alloc %s dentry\n", name);
 504                 iput(inode);
 505                 return -ENOMEM;
 506         }
 507         dentry->d_op = &gfs2_dops;
 508         *dptr = dentry;
 509         return 0;
 510 }
 511
 512 static int init_sb(struct gfs2_sbd *sdp, int silent)
 513 {
 514         struct super_block *sb = sdp->sd_vfs;
 515         struct gfs2_holder sb_gh;
 516         u64 no_addr;
 517         int ret;
 518
 519         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 520                                 LM_ST_SHARED, 0, &sb_gh);
 521         if (ret) {
 522                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 523                 return ret;
 524         }
 525
 526         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 527         if (ret) {
 528                 fs_err(sdp, "can't read superblock: %d\n", ret);
 529                 goto out;
 530         }
 531
 532         /* Set up the buffer cache and SB for real */
 533         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 534                 ret = -EINVAL;
 535                 fs_err(sdp, "FS block size (%u) is too small for device "
 536                        "block size (%u)\n",
 537                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 538                 goto out;
 539         }
 540         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 541                 ret = -EINVAL;
 542                 fs_err(sdp, "FS block size (%u) is too big for machine "
 543                        "page size (%u)\n",
 544                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 545                 goto out;
 546         }
 547         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 548
 549         /* Get the root inode */
 550         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 551         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 552         if (ret)
 553                 goto out;
 554
 555         /* Get the master inode */
 556         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 557         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 558         if (ret) {
 559                 dput(sdp->sd_root_dir);
 560                 goto out;
 561         }
 562         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 563 out:
 564         gfs2_glock_dq_uninit(&sb_gh);
 565         return ret;
 566 }
 567
 568 /**
 569  * map_journal_extents - create a reusable "extent" mapping from all logical
 570  * blocks to all physical blocks for the given journal.  This will save
 571  * us time when writing journal blocks.  Most journals will have only one
 572  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 573  * arranges the journal blocks sequentially to maximize performance.
 574  * So the extent would map the first block for the entire file length.
 575  * However, gfs2_jadd can happen while file activity is happening, so
 576  * those journals may not be sequential.  Less likely is the case where
 577  * the users created their own journals by mounting the metafs and
 578  * laying it out.  But it's still possible.  These journals might have
 579  * several extents.
 580  *
 581  * TODO: This should be done in bigger chunks rather than one block at a time,
 582  *       but since it's only done at mount time, I'm not worried about the
 583  *       time it takes.
 584  */
 585 static int map_journal_extents(struct gfs2_sbd *sdp)
 586 {
 587         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 588         unsigned int lb;
 589         u64 db, prev_db; /* logical block, disk block, prev disk block */
 590         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 591         struct gfs2_journal_extent *jext = NULL;
 592         struct buffer_head bh;
 593         int rc = 0;
 594
 595         prev_db = 0;
 596
 597         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 598                 bh.b_state = 0;
 599                 bh.b_blocknr = 0;
 600                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 601                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 602                 db = bh.b_blocknr;
 603                 if (rc || !db) {
 604                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 605                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 606                         break;
 607                 }
 608                 if (!prev_db || db != prev_db + 1) {
 609                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 610                                        GFP_KERNEL);
 611                         if (!jext) {
 612                                 printk(KERN_INFO "GFS2 error: out of memory "
 613                                        "mapping journal extents.\n");
 614                                 rc = -ENOMEM;
 615                                 break;
 616                         }
 617                         jext->dblock = db;
 618                         jext->lblock = lb;
 619                         jext->blocks = 1;
 620                         list_add_tail(&jext->extent_list, &jd->extent_list);
 621                 } else {
 622                         jext->blocks++;
 623                 }
 624                 prev_db = db;
 625         }
 626         return rc;
 627 }
 628
 629 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 630 {
 631         char *message = "FIRSTMOUNT=Done";
 632         char *envp[] = { message, NULL };
 633         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 634         ls->ls_first_done = 1;
 635         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 636 }
 637
 638 /**
 639  * gfs2_jindex_hold - Grab a lock on the jindex
 640  * @sdp: The GFS2 superblock
 641  * @ji_gh: the holder for the jindex glock
 642  *
 643  * Returns: errno
 644  */
 645
 646 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 647 {
 648         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 649         struct qstr name;
 650         char buf[20];
 651         struct gfs2_jdesc *jd;
 652         int error;
 653
 654         name.name = buf;
 655
 656         mutex_lock(&sdp->sd_jindex_mutex);
 657
 658         for (;;) {
 659                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 660                 if (error)
 661                         break;
 662
 663                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 664                 name.hash = gfs2_disk_hash(name.name, name.len);
 665
 666                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 667                 if (error == -ENOENT) {
 668                         error = 0;
 669                         break;
 670                 }
 671
 672                 gfs2_glock_dq_uninit(ji_gh);
 673
 674                 if (error)
 675                         break;
 676
 677                 error = -ENOMEM;
 678                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 679                 if (!jd)
 680                         break;
 681
 682                 INIT_LIST_HEAD(&jd->extent_list);
 683                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 684                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 685                         if (!jd->jd_inode)
 686                                 error = -ENOENT;
 687                         else
 688                                 error = PTR_ERR(jd->jd_inode);
 689                         kfree(jd);
 690                         break;
 691                 }
 692
 693                 spin_lock(&sdp->sd_jindex_spin);
 694                 jd->jd_jid = sdp->sd_journals++;
 695                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 696                 spin_unlock(&sdp->sd_jindex_spin);
 697         }
 698
 699         mutex_unlock(&sdp->sd_jindex_mutex);
 700
 701         return error;
 702 }
 703
 704 static int init_journal(struct gfs2_sbd *sdp, int undo)
 705 {
 706         struct inode *master = sdp->sd_master_dir->d_inode;
 707         struct gfs2_holder ji_gh;
 708         struct task_struct *p;
 709         struct gfs2_inode *ip;
 710         int jindex = 1;
 711         int error = 0;
 712
 713         if (undo) {
 714                 jindex = 0;
 715                 goto fail_recoverd;
 716         }
 717
 718         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 719         if (IS_ERR(sdp->sd_jindex)) {
 720                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 721                 return PTR_ERR(sdp->sd_jindex);
 722         }
 723         ip = GFS2_I(sdp->sd_jindex);
 724
 725         /* Load in the journal index special file */
 726
 727         error = gfs2_jindex_hold(sdp, &ji_gh);
 728         if (error) {
 729                 fs_err(sdp, "can't read journal index: %d\n", error);
 730                 goto fail;
 731         }
 732
 733         error = -EINVAL;
 734         if (!gfs2_jindex_size(sdp)) {
 735                 fs_err(sdp, "no journals!\n");
 736                 goto fail_jindex;
 737         }
 738
 739         if (sdp->sd_args.ar_spectator) {
 740                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 741                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 742         } else {
 743                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 744                         fs_err(sdp, "can't mount journal #%u\n",
 745                                sdp->sd_lockstruct.ls_jid);
 746                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 747                                gfs2_jindex_size(sdp),
 748                                gfs2_jindex_size(sdp) - 1);
 749                         goto fail_jindex;
 750                 }
 751                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 752
 753                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 754                                           &gfs2_journal_glops,
 755                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 756                                           &sdp->sd_journal_gh);
 757                 if (error) {
 758                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 759                         goto fail_jindex;
 760                 }
 761
 762                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 763                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 764                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 765                                            &sdp->sd_jinode_gh);
 766                 if (error) {
 767                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 768                                error);
 769                         goto fail_journal_gh;
 770                 }
 771
 772                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 773                 if (error) {
 774                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 775                                sdp->sd_jdesc->jd_jid, error);
 776                         goto fail_jinode_gh;
 777                 }
 778                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 779
 780                 /* Map the extents for this journal's blocks */
 781                 map_journal_extents(sdp);
 782         }
 783
 784         if (sdp->sd_lockstruct.ls_first) {
 785                 unsigned int x;
 786                 for (x = 0; x < sdp->sd_journals; x++) {
 787                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 788                         if (error) {
 789                                 fs_err(sdp, "error recovering journal %u: %d\n",
 790                                        x, error);
 791                                 goto fail_jinode_gh;
 792                         }
 793                 }
 794
 795                 gfs2_others_may_mount(sdp);
 796         } else if (!sdp->sd_args.ar_spectator) {
 797                 error = gfs2_recover_journal(sdp->sd_jdesc);
 798                 if (error) {
 799                         fs_err(sdp, "error recovering my journal: %d\n", error);
 800                         goto fail_jinode_gh;
 801                 }
 802         }
 803
 804         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 805         gfs2_glock_dq_uninit(&ji_gh);
 806         jindex = 0;
 807
 808         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 809         error = IS_ERR(p);
 810         if (error) {
 811                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 812                 goto fail_jinode_gh;
 813         }
 814         sdp->sd_recoverd_process = p;
 815
 816         return 0;
 817
 818 fail_recoverd:
 819         kthread_stop(sdp->sd_recoverd_process);
 820 fail_jinode_gh:
 821         if (!sdp->sd_args.ar_spectator)
 822                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 823 fail_journal_gh:
 824         if (!sdp->sd_args.ar_spectator)
 825                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 826 fail_jindex:
 827         gfs2_jindex_free(sdp);
 828         if (jindex)
 829                 gfs2_glock_dq_uninit(&ji_gh);
 830 fail:
 831         iput(sdp->sd_jindex);
 832         return error;
 833 }
 834
 835
 836 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 837 {
 838         int error = 0;
 839         struct gfs2_inode *ip;
 840         struct inode *master = sdp->sd_master_dir->d_inode;
 841
 842         if (undo)
 843                 goto fail_qinode;
 844
 845         error = init_journal(sdp, undo);
 846         if (error)
 847                 goto fail;
 848
 849         /* Read in the master inode number inode */
 850         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 851         if (IS_ERR(sdp->sd_inum_inode)) {
 852                 error = PTR_ERR(sdp->sd_inum_inode);
 853                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 854                 goto fail_journal;
 855         }
 856
 857
 858         /* Read in the master statfs inode */
 859         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 860         if (IS_ERR(sdp->sd_statfs_inode)) {
 861                 error = PTR_ERR(sdp->sd_statfs_inode);
 862                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 863                 goto fail_inum;
 864         }
 865
 866         /* Read in the resource index inode */
 867         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 868         if (IS_ERR(sdp->sd_rindex)) {
 869                 error = PTR_ERR(sdp->sd_rindex);
 870                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 871                 goto fail_statfs;
 872         }
 873         ip = GFS2_I(sdp->sd_rindex);
 874         sdp->sd_rindex_uptodate = 0;
 875
 876         /* Read in the quota inode */
 877         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 878         if (IS_ERR(sdp->sd_quota_inode)) {
 879                 error = PTR_ERR(sdp->sd_quota_inode);
 880                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 881                 goto fail_rindex;
 882         }
 883         return 0;
 884
 885 fail_qinode:
 886         iput(sdp->sd_quota_inode);
 887 fail_rindex:
 888         gfs2_clear_rgrpd(sdp);
 889         iput(sdp->sd_rindex);
 890 fail_statfs:
 891         iput(sdp->sd_statfs_inode);
 892 fail_inum:
 893         iput(sdp->sd_inum_inode);
 894 fail_journal:
 895         init_journal(sdp, UNDO);
 896 fail:
 897         return error;
 898 }
 899
 900 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 901 {
 902         struct inode *pn = NULL;
 903         char buf[30];
 904         int error = 0;
 905         struct gfs2_inode *ip;
 906         struct inode *master = sdp->sd_master_dir->d_inode;
 907
 908         if (sdp->sd_args.ar_spectator)
 909                 return 0;
 910
 911         if (undo)
 912                 goto fail_qc_gh;
 913
 914         pn = gfs2_lookup_simple(master, "per_node");
 915         if (IS_ERR(pn)) {
 916                 error = PTR_ERR(pn);
 917                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 918                 return error;
 919         }
 920
 921         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 922         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 923         if (IS_ERR(sdp->sd_ir_inode)) {
 924                 error = PTR_ERR(sdp->sd_ir_inode);
 925                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 926                 goto fail;
 927         }
 928
 929         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 930         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 931         if (IS_ERR(sdp->sd_sc_inode)) {
 932                 error = PTR_ERR(sdp->sd_sc_inode);
 933                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 934                 goto fail_ir_i;
 935         }
 936
 937         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 938         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 939         if (IS_ERR(sdp->sd_qc_inode)) {
 940                 error = PTR_ERR(sdp->sd_qc_inode);
 941                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 942                 goto fail_ut_i;
 943         }
 944
 945         iput(pn);
 946         pn = NULL;
 947
 948         ip = GFS2_I(sdp->sd_ir_inode);
 949         error = gfs2_glock_nq_init(ip->i_gl,
 950                                    LM_ST_EXCLUSIVE, 0,
 951                                    &sdp->sd_ir_gh);
 952         if (error) {
 953                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 954                 goto fail_qc_i;
 955         }
 956
 957         ip = GFS2_I(sdp->sd_sc_inode);
 958         error = gfs2_glock_nq_init(ip->i_gl,
 959                                    LM_ST_EXCLUSIVE, 0,
 960                                    &sdp->sd_sc_gh);
 961         if (error) {
 962                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 963                 goto fail_ir_gh;
 964         }
 965
 966         ip = GFS2_I(sdp->sd_qc_inode);
 967         error = gfs2_glock_nq_init(ip->i_gl,
 968                                    LM_ST_EXCLUSIVE, 0,
 969                                    &sdp->sd_qc_gh);
 970         if (error) {
 971                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 972                 goto fail_ut_gh;
 973         }
 974
 975         return 0;
 976
 977 fail_qc_gh:
 978         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 979 fail_ut_gh:
 980         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 981 fail_ir_gh:
 982         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 983 fail_qc_i:
 984         iput(sdp->sd_qc_inode);
 985 fail_ut_i:
 986         iput(sdp->sd_sc_inode);
 987 fail_ir_i:
 988         iput(sdp->sd_ir_inode);
 989 fail:
 990         if (pn)
 991                 iput(pn);
 992         return error;
 993 }
 994
 995 static int init_threads(struct gfs2_sbd *sdp, int undo)
 996 {
 997         struct task_struct *p;
 998         int error = 0;
 999
1000         if (undo)
1001                 goto fail_quotad;
1002
1003         sdp->sd_log_flush_time = jiffies;
1004
1005         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1006         error = IS_ERR(p);
1007         if (error) {
1008                 fs_err(sdp, "can't start logd thread: %d\n", error);
1009                 return error;
1010         }
1011         sdp->sd_logd_process = p;
1012
1013         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1014         error = IS_ERR(p);
1015         if (error) {
1016                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1017                 goto fail;
1018         }
1019         sdp->sd_quotad_process = p;
1020
1021         return 0;
1022
1023
1024 fail_quotad:
1025         kthread_stop(sdp->sd_quotad_process);
1026 fail:
1027         kthread_stop(sdp->sd_logd_process);
1028         return error;
1029 }
1030
1031 static const match_table_t nolock_tokens = {
1032         { Opt_jid, "jid=%d\n", },
1033         { Opt_err, NULL },
1034 };
1035
1036 static const struct lm_lockops nolock_ops = {
1037         .lm_proto_name = "lock_nolock",
1038         .lm_put_lock = kmem_cache_free,
1039         .lm_tokens = &nolock_tokens,
1040 };
1041
1042 /**
1043  * gfs2_lm_mount - mount a locking protocol
1044  * @sdp: the filesystem
1045  * @args: mount arguements
1046  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1047  *
1048  * Returns: errno
1049  */
1050
1051 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1052 {
1053         const struct lm_lockops *lm;
1054         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1055         struct gfs2_args *args = &sdp->sd_args;
1056         const char *proto = sdp->sd_proto_name;
1057         const char *table = sdp->sd_table_name;
1058         const char *fsname;
1059         char *o, *options;
1060         int ret;
1061
1062         if (!strcmp("lock_nolock", proto)) {
1063                 lm = &nolock_ops;
1064                 sdp->sd_args.ar_localflocks = 1;
1065                 sdp->sd_args.ar_localcaching = 1;
1066 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1067         } else if (!strcmp("lock_dlm", proto)) {
1068                 lm = &gfs2_dlm_ops;
1069 #endif
1070         } else {
1071                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1072                 return -ENOENT;
1073         }
1074
1075         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1076
1077         ls->ls_ops = lm;
1078         ls->ls_first = 1;
1079         ls->ls_id = 0;
1080
1081         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1082                 substring_t tmp[MAX_OPT_ARGS];
1083                 int token, option;
1084
1085                 if (!o || !*o)
1086                         continue;
1087
1088                 token = match_token(o, *lm->lm_tokens, tmp);
1089                 switch (token) {
1090                 case Opt_jid:
1091                         ret = match_int(&tmp[0], &option);
1092                         if (ret || option < 0)
1093                                 goto hostdata_error;
1094                         ls->ls_jid = option;
1095                         break;
1096                 case Opt_id:
1097                         ret = match_int(&tmp[0], &option);
1098                         if (ret)
1099                                 goto hostdata_error;
1100                         ls->ls_id = option;
1101                         break;
1102                 case Opt_first:
1103                         ret = match_int(&tmp[0], &option);
1104                         if (ret || (option != 0 && option != 1))
1105                                 goto hostdata_error;
1106                         ls->ls_first = option;
1107                         break;
1108                 case Opt_nodir:
1109                         ret = match_int(&tmp[0], &option);
1110                         if (ret || (option != 0 && option != 1))
1111                                 goto hostdata_error;
1112                         ls->ls_nodir = option;
1113                         break;
1114                 case Opt_err:
1115                 default:
1116 hostdata_error:
1117                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1118                         return -EINVAL;
1119                 }
1120         }
1121
1122         if (sdp->sd_args.ar_spectator)
1123                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1124         else
1125                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1126                          sdp->sd_lockstruct.ls_jid);
1127
1128         fsname = strchr(table, ':');
1129         if (fsname)
1130                 fsname++;
1131         if (lm->lm_mount == NULL) {
1132                 fs_info(sdp, "Now mounting FS...\n");
1133                 return 0;
1134         }
1135         ret = lm->lm_mount(sdp, fsname);
1136         if (ret == 0)
1137                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1138         return ret;
1139 }
1140
1141 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1142 {
1143         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1144         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1145             lm->lm_unmount)
1146                 lm->lm_unmount(sdp);
1147 }
1148
1149 /**
1150  * fill_super - Read in superblock
1151  * @sb: The VFS superblock
1152  * @data: Mount options
1153  * @silent: Don't complain if it's not a GFS2 filesystem
1154  *
1155  * Returns: errno
1156  */
1157
1158 static int fill_super(struct super_block *sb, void *data, int silent)
1159 {
1160         struct gfs2_sbd *sdp;
1161         struct gfs2_holder mount_gh;
1162         int error;
1163
1164         sdp = init_sbd(sb);
1165         if (!sdp) {
1166                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1167                 return -ENOMEM;
1168         }
1169
1170         sdp->sd_args.ar_quota = GFS2_QUOTA_DEFAULT;
1171         sdp->sd_args.ar_data = GFS2_DATA_DEFAULT;
1172
1173         error = gfs2_mount_args(sdp, &sdp->sd_args, data);
1174         if (error) {
1175                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1176                 goto fail;
1177         }
1178
1179         if (sdp->sd_args.ar_spectator)
1180                 sb->s_flags |= MS_RDONLY;
1181         if (sdp->sd_args.ar_posix_acl)
1182                 sb->s_flags |= MS_POSIXACL;
1183
1184         sb->s_magic = GFS2_MAGIC;
1185         sb->s_op = &gfs2_super_ops;
1186         sb->s_export_op = &gfs2_export_ops;
1187         sb->s_time_gran = 1;
1188         sb->s_maxbytes = MAX_LFS_FILESIZE;
1189
1190         /* Set up the buffer cache and fill in some fake block size values
1191            to allow us to read-in the on-disk superblock. */
1192         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1193         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1194         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1195                                GFS2_BASIC_BLOCK_SHIFT;
1196         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1197
1198         error = init_names(sdp, silent);
1199         if (error)
1200                 goto fail;
1201
1202         gfs2_create_debugfs_file(sdp);
1203
1204         error = gfs2_sys_fs_add(sdp);
1205         if (error)
1206                 goto fail;
1207
1208         error = gfs2_lm_mount(sdp, silent);
1209         if (error)
1210                 goto fail_sys;
1211
1212         error = init_locking(sdp, &mount_gh, DO);
1213         if (error)
1214                 goto fail_lm;
1215
1216         error = init_sb(sdp, silent);
1217         if (error)
1218                 goto fail_locking;
1219
1220         error = init_inodes(sdp, DO);
1221         if (error)
1222                 goto fail_sb;
1223
1224         error = init_per_node(sdp, DO);
1225         if (error)
1226                 goto fail_inodes;
1227
1228         error = gfs2_statfs_init(sdp);
1229         if (error) {
1230                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1231                 goto fail_per_node;
1232         }
1233
1234         error = init_threads(sdp, DO);
1235         if (error)
1236                 goto fail_per_node;
1237
1238         if (!(sb->s_flags & MS_RDONLY)) {
1239                 error = gfs2_make_fs_rw(sdp);
1240                 if (error) {
1241                         fs_err(sdp, "can't make FS RW: %d\n", error);
1242                         goto fail_threads;
1243                 }
1244         }
1245
1246         gfs2_glock_dq_uninit(&mount_gh);
1247
1248         return 0;
1249
1250 fail_threads:
1251         init_threads(sdp, UNDO);
1252 fail_per_node:
1253         init_per_node(sdp, UNDO);
1254 fail_inodes:
1255         init_inodes(sdp, UNDO);
1256 fail_sb:
1257         if (sdp->sd_root_dir)
1258                 dput(sdp->sd_root_dir);
1259         if (sdp->sd_master_dir)
1260                 dput(sdp->sd_master_dir);
1261         if (sb->s_root)
1262                 dput(sb->s_root);
1263         sb->s_root = NULL;
1264 fail_locking:
1265         init_locking(sdp, &mount_gh, UNDO);
1266 fail_lm:
1267         gfs2_gl_hash_clear(sdp);
1268         gfs2_lm_unmount(sdp);
1269         while (invalidate_inodes(sb))
1270                 yield();
1271 fail_sys:
1272         gfs2_sys_fs_del(sdp);
1273 fail:
1274         gfs2_delete_debugfs_file(sdp);
1275         kfree(sdp);
1276         sb->s_fs_info = NULL;
1277         return error;
1278 }
1279
1280 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1281                        const char *dev_name, void *data, struct vfsmount *mnt)
1282 {
1283         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1284 }
1285
1286 static struct super_block *get_gfs2_sb(const char *dev_name)
1287 {
1288         struct super_block *sb;
1289         struct nameidata nd;
1290         int error;
1291
1292         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1293         if (error) {
1294                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1295                        dev_name, error);
1296                 return NULL;
1297         }
1298         sb = nd.path.dentry->d_inode->i_sb;
1299         if (sb && (sb->s_type == &gfs2_fs_type))
1300                 atomic_inc(&sb->s_active);
1301         else
1302                 sb = NULL;
1303         path_put(&nd.path);
1304         return sb;
1305 }
1306
1307 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1308                             const char *dev_name, void *data, struct vfsmount *mnt)
1309 {
1310         struct super_block *sb = NULL;
1311         struct gfs2_sbd *sdp;
1312
1313         sb = get_gfs2_sb(dev_name);
1314         if (!sb) {
1315                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1316                 return -ENOENT;
1317         }
1318         sdp = sb->s_fs_info;
1319         mnt->mnt_sb = sb;
1320         mnt->mnt_root = dget(sdp->sd_master_dir);
1321         return 0;
1322 }
1323
1324 static void gfs2_kill_sb(struct super_block *sb)
1325 {
1326         struct gfs2_sbd *sdp = sb->s_fs_info;
1327
1328         if (sdp == NULL) {
1329                 kill_block_super(sb);
1330                 return;
1331         }
1332
1333         gfs2_meta_syncfs(sdp);
1334         dput(sdp->sd_root_dir);
1335         dput(sdp->sd_master_dir);
1336         sdp->sd_root_dir = NULL;
1337         sdp->sd_master_dir = NULL;
1338         shrink_dcache_sb(sb);
1339         kill_block_super(sb);
1340         gfs2_delete_debugfs_file(sdp);
1341         kfree(sdp);
1342 }
1343
1344 struct file_system_type gfs2_fs_type = {
1345         .name = "gfs2",
1346         .fs_flags = FS_REQUIRES_DEV,
1347         .get_sb = gfs2_get_sb,
1348         .kill_sb = gfs2_kill_sb,
1349         .owner = THIS_MODULE,
1350 };
1351
1352 struct file_system_type gfs2meta_fs_type = {
1353         .name = "gfs2meta",
1354         .fs_flags = FS_REQUIRES_DEV,
1355         .get_sb = gfs2_get_sb_meta,
1356         .owner = THIS_MODULE,
1357 };
1358