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 #include <linux/slow-work.h>
  21 #include <linux/quotaops.h>
  22
  23 #include "gfs2.h"
  24 #include "incore.h"
  25 #include "bmap.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.h"
  29 #include "recovery.h"
  30 #include "rgrp.h"
  31 #include "super.h"
  32 #include "sys.h"
  33 #include "util.h"
  34 #include "log.h"
  35 #include "quota.h"
  36 #include "dir.h"
  37 #include "trace_gfs2.h"
  38
  39 #define DO 0
  40 #define UNDO 1
  41
  42 static const u32 gfs2_old_fs_formats[] = {
  43         0
  44 };
  45
  46 static const u32 gfs2_old_multihost_formats[] = {
  47         0
  48 };
  49
  50 /**
  51  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  52  * @gt: tune
  53  *
  54  */
  55
  56 static void gfs2_tune_init(struct gfs2_tune *gt)
  57 {
  58         spin_lock_init(&gt->gt_spin);
  59
  60         gt->gt_incore_log_blocks = 1024;
  61         gt->gt_logd_secs = 1;
  62         gt->gt_quota_simul_sync = 64;
  63         gt->gt_quota_warn_period = 10;
  64         gt->gt_quota_scale_num = 1;
  65         gt->gt_quota_scale_den = 1;
  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 }
  71
  72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  73 {
  74         struct gfs2_sbd *sdp;
  75
  76         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  77         if (!sdp)
  78                 return NULL;
  79
  80         sb->s_fs_info = sdp;
  81         sdp->sd_vfs = sb;
  82
  83         gfs2_tune_init(&sdp->sd_tune);
  84
  85         spin_lock_init(&sdp->sd_statfs_spin);
  86
  87         spin_lock_init(&sdp->sd_rindex_spin);
  88         mutex_init(&sdp->sd_rindex_mutex);
  89         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  90         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  91
  92         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  93         spin_lock_init(&sdp->sd_jindex_spin);
  94         mutex_init(&sdp->sd_jindex_mutex);
  95
  96         INIT_LIST_HEAD(&sdp->sd_quota_list);
  97         mutex_init(&sdp->sd_quota_mutex);
  98         init_waitqueue_head(&sdp->sd_quota_wait);
  99         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 100         spin_lock_init(&sdp->sd_trunc_lock);
 101
 102         spin_lock_init(&sdp->sd_log_lock);
 103
 104         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 105         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 106         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 107         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 108         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 109
 110         mutex_init(&sdp->sd_log_reserve_mutex);
 111         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 112         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 113
 114         init_rwsem(&sdp->sd_log_flush_lock);
 115         atomic_set(&sdp->sd_log_in_flight, 0);
 116         init_waitqueue_head(&sdp->sd_log_flush_wait);
 117
 118         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 119
 120         mutex_init(&sdp->sd_freeze_lock);
 121
 122         return sdp;
 123 }
 124
 125
 126 /**
 127  * gfs2_check_sb - Check superblock
 128  * @sdp: the filesystem
 129  * @sb: The superblock
 130  * @silent: Don't print a message if the check fails
 131  *
 132  * Checks the version code of the FS is one that we understand how to
 133  * read and that the sizes of the various on-disk structures have not
 134  * changed.
 135  */
 136
 137 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 138 {
 139         unsigned int x;
 140
 141         if (sb->sb_magic != GFS2_MAGIC ||
 142             sb->sb_type != GFS2_METATYPE_SB) {
 143                 if (!silent)
 144                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 145                 return -EINVAL;
 146         }
 147
 148         /*  If format numbers match exactly, we're done.  */
 149
 150         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 151             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 152                 return 0;
 153
 154         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 155                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 156                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 157                                 break;
 158
 159                 if (!gfs2_old_fs_formats[x]) {
 160                         printk(KERN_WARNING
 161                                "GFS2: code version (%u, %u) is incompatible "
 162                                "with ondisk format (%u, %u)\n",
 163                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 164                                sb->sb_fs_format, sb->sb_multihost_format);
 165                         printk(KERN_WARNING
 166                                "GFS2: I don't know how to upgrade this FS\n");
 167                         return -EINVAL;
 168                 }
 169         }
 170
 171         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 172                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 173                         if (gfs2_old_multihost_formats[x] ==
 174                             sb->sb_multihost_format)
 175                                 break;
 176
 177                 if (!gfs2_old_multihost_formats[x]) {
 178                         printk(KERN_WARNING
 179                                "GFS2: code version (%u, %u) is incompatible "
 180                                "with ondisk format (%u, %u)\n",
 181                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 182                                sb->sb_fs_format, sb->sb_multihost_format);
 183                         printk(KERN_WARNING
 184                                "GFS2: I don't know how to upgrade this FS\n");
 185                         return -EINVAL;
 186                 }
 187         }
 188
 189         if (!sdp->sd_args.ar_upgrade) {
 190                 printk(KERN_WARNING
 191                        "GFS2: code version (%u, %u) is incompatible "
 192                        "with ondisk format (%u, %u)\n",
 193                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 194                        sb->sb_fs_format, sb->sb_multihost_format);
 195                 printk(KERN_INFO
 196                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 197                        "the FS\n");
 198                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 199                 return -EINVAL;
 200         }
 201
 202         return 0;
 203 }
 204
 205 static void end_bio_io_page(struct bio *bio, int error)
 206 {
 207         struct page *page = bio->bi_private;
 208
 209         if (!error)
 210                 SetPageUptodate(page);
 211         else
 212                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 213         unlock_page(page);
 214 }
 215
 216 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 217 {
 218         const struct gfs2_sb *str = buf;
 219
 220         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 221         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 222         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 223         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 224         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 225         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 226         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 227         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 228         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 229         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 230         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 231
 232         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 233         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 234         memcpy(sb->sb_uuid, str->sb_uuid, 16);
 235 }
 236
 237 /**
 238  * gfs2_read_super - Read the gfs2 super block from disk
 239  * @sdp: The GFS2 super block
 240  * @sector: The location of the super block
 241  * @error: The error code to return
 242  *
 243  * This uses the bio functions to read the super block from disk
 244  * because we want to be 100% sure that we never read cached data.
 245  * A super block is read twice only during each GFS2 mount and is
 246  * never written to by the filesystem. The first time its read no
 247  * locks are held, and the only details which are looked at are those
 248  * relating to the locking protocol. Once locking is up and working,
 249  * the sb is read again under the lock to establish the location of
 250  * the master directory (contains pointers to journals etc) and the
 251  * root directory.
 252  *
 253  * Returns: 0 on success or error
 254  */
 255
 256 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 257 {
 258         struct super_block *sb = sdp->sd_vfs;
 259         struct gfs2_sb *p;
 260         struct page *page;
 261         struct bio *bio;
 262
 263         page = alloc_page(GFP_NOFS);
 264         if (unlikely(!page))
 265                 return -ENOBUFS;
 266
 267         ClearPageUptodate(page);
 268         ClearPageDirty(page);
 269         lock_page(page);
 270
 271         bio = bio_alloc(GFP_NOFS, 1);
 272         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 273         bio->bi_bdev = sb->s_bdev;
 274         bio_add_page(bio, page, PAGE_SIZE, 0);
 275
 276         bio->bi_end_io = end_bio_io_page;
 277         bio->bi_private = page;
 278         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 279         wait_on_page_locked(page);
 280         bio_put(bio);
 281         if (!PageUptodate(page)) {
 282                 __free_page(page);
 283                 return -EIO;
 284         }
 285         p = kmap(page);
 286         gfs2_sb_in(&sdp->sd_sb, p);
 287         kunmap(page);
 288         __free_page(page);
 289         return 0;
 290 }
 291
 292 /**
 293  * gfs2_read_sb - Read super block
 294  * @sdp: The GFS2 superblock
 295  * @silent: Don't print message if mount fails
 296  *
 297  */
 298
 299 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 300 {
 301         u32 hash_blocks, ind_blocks, leaf_blocks;
 302         u32 tmp_blocks;
 303         unsigned int x;
 304         int error;
 305
 306         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 307         if (error) {
 308                 if (!silent)
 309                         fs_err(sdp, "can't read superblock\n");
 310                 return error;
 311         }
 312
 313         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 314         if (error)
 315                 return error;
 316
 317         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 318                                GFS2_BASIC_BLOCK_SHIFT;
 319         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 320         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 321                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 322         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 323                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 324         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 325         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 326         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 327         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 328         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 329                                 sizeof(struct gfs2_meta_header)) /
 330                                 sizeof(struct gfs2_quota_change);
 331
 332         /* Compute maximum reservation required to add a entry to a directory */
 333
 334         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 335                              sdp->sd_jbsize);
 336
 337         ind_blocks = 0;
 338         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 339                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 340                 ind_blocks += tmp_blocks;
 341         }
 342
 343         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 344
 345         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 346
 347         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 348                                 sizeof(struct gfs2_dinode);
 349         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 350         for (x = 2;; x++) {
 351                 u64 space, d;
 352                 u32 m;
 353
 354                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 355                 d = space;
 356                 m = do_div(d, sdp->sd_inptrs);
 357
 358                 if (d != sdp->sd_heightsize[x - 1] || m)
 359                         break;
 360                 sdp->sd_heightsize[x] = space;
 361         }
 362         sdp->sd_max_height = x;
 363         sdp->sd_heightsize[x] = ~0;
 364         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 365
 366         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 367                                  sizeof(struct gfs2_dinode);
 368         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 369         for (x = 2;; x++) {
 370                 u64 space, d;
 371                 u32 m;
 372
 373                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 374                 d = space;
 375                 m = do_div(d, sdp->sd_inptrs);
 376
 377                 if (d != sdp->sd_jheightsize[x - 1] || m)
 378                         break;
 379                 sdp->sd_jheightsize[x] = space;
 380         }
 381         sdp->sd_max_jheight = x;
 382         sdp->sd_jheightsize[x] = ~0;
 383         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 384
 385         return 0;
 386 }
 387
 388 static int init_names(struct gfs2_sbd *sdp, int silent)
 389 {
 390         char *proto, *table;
 391         int error = 0;
 392
 393         proto = sdp->sd_args.ar_lockproto;
 394         table = sdp->sd_args.ar_locktable;
 395
 396         /*  Try to autodetect  */
 397
 398         if (!proto[0] || !table[0]) {
 399                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 400                 if (error)
 401                         return error;
 402
 403                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 404                 if (error)
 405                         goto out;
 406
 407                 if (!proto[0])
 408                         proto = sdp->sd_sb.sb_lockproto;
 409                 if (!table[0])
 410                         table = sdp->sd_sb.sb_locktable;
 411         }
 412
 413         if (!table[0])
 414                 table = sdp->sd_vfs->s_id;
 415
 416         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 417         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 418
 419         table = sdp->sd_table_name;
 420         while ((table = strchr(table, '/')))
 421                 *table = '_';
 422
 423 out:
 424         return error;
 425 }
 426
 427 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 428                         int undo)
 429 {
 430         int error = 0;
 431
 432         if (undo)
 433                 goto fail_trans;
 434
 435         error = gfs2_glock_nq_num(sdp,
 436                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 437                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 438                                   mount_gh);
 439         if (error) {
 440                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 441                 goto fail;
 442         }
 443
 444         error = gfs2_glock_nq_num(sdp,
 445                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 446                                   LM_ST_SHARED,
 447                                   LM_FLAG_NOEXP | GL_EXACT,
 448                                   &sdp->sd_live_gh);
 449         if (error) {
 450                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 451                 goto fail_mount;
 452         }
 453
 454         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 455                                CREATE, &sdp->sd_rename_gl);
 456         if (error) {
 457                 fs_err(sdp, "can't create rename glock: %d\n", error);
 458                 goto fail_live;
 459         }
 460
 461         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 462                                CREATE, &sdp->sd_trans_gl);
 463         if (error) {
 464                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 465                 goto fail_rename;
 466         }
 467
 468         return 0;
 469
 470 fail_trans:
 471         gfs2_glock_put(sdp->sd_trans_gl);
 472 fail_rename:
 473         gfs2_glock_put(sdp->sd_rename_gl);
 474 fail_live:
 475         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 476 fail_mount:
 477         gfs2_glock_dq_uninit(mount_gh);
 478 fail:
 479         return error;
 480 }
 481
 482 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 483                             u64 no_addr, const char *name)
 484 {
 485         struct gfs2_sbd *sdp = sb->s_fs_info;
 486         struct dentry *dentry;
 487         struct inode *inode;
 488
 489         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 490         if (IS_ERR(inode)) {
 491                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 492                 return PTR_ERR(inode);
 493         }
 494         dentry = d_alloc_root(inode);
 495         if (!dentry) {
 496                 fs_err(sdp, "can't alloc %s dentry\n", name);
 497                 iput(inode);
 498                 return -ENOMEM;
 499         }
 500         dentry->d_op = &gfs2_dops;
 501         *dptr = dentry;
 502         return 0;
 503 }
 504
 505 static int init_sb(struct gfs2_sbd *sdp, int silent)
 506 {
 507         struct super_block *sb = sdp->sd_vfs;
 508         struct gfs2_holder sb_gh;
 509         u64 no_addr;
 510         int ret;
 511
 512         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 513                                 LM_ST_SHARED, 0, &sb_gh);
 514         if (ret) {
 515                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 516                 return ret;
 517         }
 518
 519         ret = gfs2_read_sb(sdp, silent);
 520         if (ret) {
 521                 fs_err(sdp, "can't read superblock: %d\n", ret);
 522                 goto out;
 523         }
 524
 525         /* Set up the buffer cache and SB for real */
 526         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 527                 ret = -EINVAL;
 528                 fs_err(sdp, "FS block size (%u) is too small for device "
 529                        "block size (%u)\n",
 530                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 531                 goto out;
 532         }
 533         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 534                 ret = -EINVAL;
 535                 fs_err(sdp, "FS block size (%u) is too big for machine "
 536                        "page size (%u)\n",
 537                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 538                 goto out;
 539         }
 540         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 541
 542         /* Get the root inode */
 543         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 544         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 545         if (ret)
 546                 goto out;
 547
 548         /* Get the master inode */
 549         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 550         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 551         if (ret) {
 552                 dput(sdp->sd_root_dir);
 553                 goto out;
 554         }
 555         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 556 out:
 557         gfs2_glock_dq_uninit(&sb_gh);
 558         return ret;
 559 }
 560
 561 /**
 562  * map_journal_extents - create a reusable "extent" mapping from all logical
 563  * blocks to all physical blocks for the given journal.  This will save
 564  * us time when writing journal blocks.  Most journals will have only one
 565  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 566  * arranges the journal blocks sequentially to maximize performance.
 567  * So the extent would map the first block for the entire file length.
 568  * However, gfs2_jadd can happen while file activity is happening, so
 569  * those journals may not be sequential.  Less likely is the case where
 570  * the users created their own journals by mounting the metafs and
 571  * laying it out.  But it's still possible.  These journals might have
 572  * several extents.
 573  *
 574  * TODO: This should be done in bigger chunks rather than one block at a time,
 575  *       but since it's only done at mount time, I'm not worried about the
 576  *       time it takes.
 577  */
 578 static int map_journal_extents(struct gfs2_sbd *sdp)
 579 {
 580         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 581         unsigned int lb;
 582         u64 db, prev_db; /* logical block, disk block, prev disk block */
 583         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 584         struct gfs2_journal_extent *jext = NULL;
 585         struct buffer_head bh;
 586         int rc = 0;
 587
 588         prev_db = 0;
 589
 590         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 591                 bh.b_state = 0;
 592                 bh.b_blocknr = 0;
 593                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 594                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 595                 db = bh.b_blocknr;
 596                 if (rc || !db) {
 597                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 598                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 599                         break;
 600                 }
 601                 if (!prev_db || db != prev_db + 1) {
 602                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 603                                        GFP_KERNEL);
 604                         if (!jext) {
 605                                 printk(KERN_INFO "GFS2 error: out of memory "
 606                                        "mapping journal extents.\n");
 607                                 rc = -ENOMEM;
 608                                 break;
 609                         }
 610                         jext->dblock = db;
 611                         jext->lblock = lb;
 612                         jext->blocks = 1;
 613                         list_add_tail(&jext->extent_list, &jd->extent_list);
 614                 } else {
 615                         jext->blocks++;
 616                 }
 617                 prev_db = db;
 618         }
 619         return rc;
 620 }
 621
 622 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 623 {
 624         char *message = "FIRSTMOUNT=Done";
 625         char *envp[] = { message, NULL };
 626         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 627         ls->ls_first_done = 1;
 628         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 629 }
 630
 631 /**
 632  * gfs2_jindex_hold - Grab a lock on the jindex
 633  * @sdp: The GFS2 superblock
 634  * @ji_gh: the holder for the jindex glock
 635  *
 636  * Returns: errno
 637  */
 638
 639 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 640 {
 641         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 642         struct qstr name;
 643         char buf[20];
 644         struct gfs2_jdesc *jd;
 645         int error;
 646
 647         name.name = buf;
 648
 649         mutex_lock(&sdp->sd_jindex_mutex);
 650
 651         for (;;) {
 652                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 653                 if (error)
 654                         break;
 655
 656                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 657                 name.hash = gfs2_disk_hash(name.name, name.len);
 658
 659                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 660                 if (error == -ENOENT) {
 661                         error = 0;
 662                         break;
 663                 }
 664
 665                 gfs2_glock_dq_uninit(ji_gh);
 666
 667                 if (error)
 668                         break;
 669
 670                 error = -ENOMEM;
 671                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 672                 if (!jd)
 673                         break;
 674
 675                 INIT_LIST_HEAD(&jd->extent_list);
 676                 slow_work_init(&jd->jd_work, &gfs2_recover_ops);
 677                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 678                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 679                         if (!jd->jd_inode)
 680                                 error = -ENOENT;
 681                         else
 682                                 error = PTR_ERR(jd->jd_inode);
 683                         kfree(jd);
 684                         break;
 685                 }
 686
 687                 spin_lock(&sdp->sd_jindex_spin);
 688                 jd->jd_jid = sdp->sd_journals++;
 689                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 690                 spin_unlock(&sdp->sd_jindex_spin);
 691         }
 692
 693         mutex_unlock(&sdp->sd_jindex_mutex);
 694
 695         return error;
 696 }
 697
 698 static int init_journal(struct gfs2_sbd *sdp, int undo)
 699 {
 700         struct inode *master = sdp->sd_master_dir->d_inode;
 701         struct gfs2_holder ji_gh;
 702         struct gfs2_inode *ip;
 703         int jindex = 1;
 704         int error = 0;
 705
 706         if (undo) {
 707                 jindex = 0;
 708                 goto fail_jinode_gh;
 709         }
 710
 711         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 712         if (IS_ERR(sdp->sd_jindex)) {
 713                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 714                 return PTR_ERR(sdp->sd_jindex);
 715         }
 716         ip = GFS2_I(sdp->sd_jindex);
 717
 718         /* Load in the journal index special file */
 719
 720         error = gfs2_jindex_hold(sdp, &ji_gh);
 721         if (error) {
 722                 fs_err(sdp, "can't read journal index: %d\n", error);
 723                 goto fail;
 724         }
 725
 726         error = -EINVAL;
 727         if (!gfs2_jindex_size(sdp)) {
 728                 fs_err(sdp, "no journals!\n");
 729                 goto fail_jindex;
 730         }
 731
 732         if (sdp->sd_args.ar_spectator) {
 733                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 734                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 735         } else {
 736                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 737                         fs_err(sdp, "can't mount journal #%u\n",
 738                                sdp->sd_lockstruct.ls_jid);
 739                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 740                                gfs2_jindex_size(sdp),
 741                                gfs2_jindex_size(sdp) - 1);
 742                         goto fail_jindex;
 743                 }
 744                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 745
 746                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 747                                           &gfs2_journal_glops,
 748                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 749                                           &sdp->sd_journal_gh);
 750                 if (error) {
 751                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 752                         goto fail_jindex;
 753                 }
 754
 755                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 756                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 757                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 758                                            &sdp->sd_jinode_gh);
 759                 if (error) {
 760                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 761                                error);
 762                         goto fail_journal_gh;
 763                 }
 764
 765                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 766                 if (error) {
 767                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 768                                sdp->sd_jdesc->jd_jid, error);
 769                         goto fail_jinode_gh;
 770                 }
 771                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 772
 773                 /* Map the extents for this journal's blocks */
 774                 map_journal_extents(sdp);
 775         }
 776         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 777
 778         if (sdp->sd_lockstruct.ls_first) {
 779                 unsigned int x;
 780                 for (x = 0; x < sdp->sd_journals; x++) {
 781                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 782                         if (error) {
 783                                 fs_err(sdp, "error recovering journal %u: %d\n",
 784                                        x, error);
 785                                 goto fail_jinode_gh;
 786                         }
 787                 }
 788
 789                 gfs2_others_may_mount(sdp);
 790         } else if (!sdp->sd_args.ar_spectator) {
 791                 error = gfs2_recover_journal(sdp->sd_jdesc);
 792                 if (error) {
 793                         fs_err(sdp, "error recovering my journal: %d\n", error);
 794                         goto fail_jinode_gh;
 795                 }
 796         }
 797
 798         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 799         gfs2_glock_dq_uninit(&ji_gh);
 800         jindex = 0;
 801
 802         return 0;
 803
 804 fail_jinode_gh:
 805         if (!sdp->sd_args.ar_spectator)
 806                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 807 fail_journal_gh:
 808         if (!sdp->sd_args.ar_spectator)
 809                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 810 fail_jindex:
 811         gfs2_jindex_free(sdp);
 812         if (jindex)
 813                 gfs2_glock_dq_uninit(&ji_gh);
 814 fail:
 815         iput(sdp->sd_jindex);
 816         return error;
 817 }
 818
 819
 820 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 821 {
 822         int error = 0;
 823         struct gfs2_inode *ip;
 824         struct inode *master = sdp->sd_master_dir->d_inode;
 825
 826         if (undo)
 827                 goto fail_qinode;
 828
 829         error = init_journal(sdp, undo);
 830         if (error)
 831                 goto fail;
 832
 833         /* Read in the master statfs inode */
 834         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 835         if (IS_ERR(sdp->sd_statfs_inode)) {
 836                 error = PTR_ERR(sdp->sd_statfs_inode);
 837                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 838                 goto fail_journal;
 839         }
 840
 841         /* Read in the resource index inode */
 842         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 843         if (IS_ERR(sdp->sd_rindex)) {
 844                 error = PTR_ERR(sdp->sd_rindex);
 845                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 846                 goto fail_statfs;
 847         }
 848         ip = GFS2_I(sdp->sd_rindex);
 849         sdp->sd_rindex_uptodate = 0;
 850
 851         /* Read in the quota inode */
 852         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 853         if (IS_ERR(sdp->sd_quota_inode)) {
 854                 error = PTR_ERR(sdp->sd_quota_inode);
 855                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 856                 goto fail_rindex;
 857         }
 858         return 0;
 859
 860 fail_qinode:
 861         iput(sdp->sd_quota_inode);
 862 fail_rindex:
 863         gfs2_clear_rgrpd(sdp);
 864         iput(sdp->sd_rindex);
 865 fail_statfs:
 866         iput(sdp->sd_statfs_inode);
 867 fail_journal:
 868         init_journal(sdp, UNDO);
 869 fail:
 870         return error;
 871 }
 872
 873 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 874 {
 875         struct inode *pn = NULL;
 876         char buf[30];
 877         int error = 0;
 878         struct gfs2_inode *ip;
 879         struct inode *master = sdp->sd_master_dir->d_inode;
 880
 881         if (sdp->sd_args.ar_spectator)
 882                 return 0;
 883
 884         if (undo)
 885                 goto fail_qc_gh;
 886
 887         pn = gfs2_lookup_simple(master, "per_node");
 888         if (IS_ERR(pn)) {
 889                 error = PTR_ERR(pn);
 890                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 891                 return error;
 892         }
 893
 894         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 895         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 896         if (IS_ERR(sdp->sd_sc_inode)) {
 897                 error = PTR_ERR(sdp->sd_sc_inode);
 898                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 899                 goto fail;
 900         }
 901
 902         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 903         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 904         if (IS_ERR(sdp->sd_qc_inode)) {
 905                 error = PTR_ERR(sdp->sd_qc_inode);
 906                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 907                 goto fail_ut_i;
 908         }
 909
 910         iput(pn);
 911         pn = NULL;
 912
 913         ip = GFS2_I(sdp->sd_sc_inode);
 914         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 915                                    &sdp->sd_sc_gh);
 916         if (error) {
 917                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 918                 goto fail_qc_i;
 919         }
 920
 921         ip = GFS2_I(sdp->sd_qc_inode);
 922         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 923                                    &sdp->sd_qc_gh);
 924         if (error) {
 925                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 926                 goto fail_ut_gh;
 927         }
 928
 929         return 0;
 930
 931 fail_qc_gh:
 932         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 933 fail_ut_gh:
 934         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 935 fail_qc_i:
 936         iput(sdp->sd_qc_inode);
 937 fail_ut_i:
 938         iput(sdp->sd_sc_inode);
 939 fail:
 940         if (pn)
 941                 iput(pn);
 942         return error;
 943 }
 944
 945 static int init_threads(struct gfs2_sbd *sdp, int undo)
 946 {
 947         struct task_struct *p;
 948         int error = 0;
 949
 950         if (undo)
 951                 goto fail_quotad;
 952
 953         sdp->sd_log_flush_time = jiffies;
 954
 955         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 956         error = IS_ERR(p);
 957         if (error) {
 958                 fs_err(sdp, "can't start logd thread: %d\n", error);
 959                 return error;
 960         }
 961         sdp->sd_logd_process = p;
 962
 963         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 964         error = IS_ERR(p);
 965         if (error) {
 966                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 967                 goto fail;
 968         }
 969         sdp->sd_quotad_process = p;
 970
 971         return 0;
 972
 973
 974 fail_quotad:
 975         kthread_stop(sdp->sd_quotad_process);
 976 fail:
 977         kthread_stop(sdp->sd_logd_process);
 978         return error;
 979 }
 980
 981 static const match_table_t nolock_tokens = {
 982         { Opt_jid, "jid=%d\n", },
 983         { Opt_err, NULL },
 984 };
 985
 986 static const struct lm_lockops nolock_ops = {
 987         .lm_proto_name = "lock_nolock",
 988         .lm_put_lock = kmem_cache_free,
 989         .lm_tokens = &nolock_tokens,
 990 };
 991
 992 /**
 993  * gfs2_lm_mount - mount a locking protocol
 994  * @sdp: the filesystem
 995  * @args: mount arguements
 996  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 997  *
 998  * Returns: errno
 999  */
1000
1001 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1002 {
1003         const struct lm_lockops *lm;
1004         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1005         struct gfs2_args *args = &sdp->sd_args;
1006         const char *proto = sdp->sd_proto_name;
1007         const char *table = sdp->sd_table_name;
1008         const char *fsname;
1009         char *o, *options;
1010         int ret;
1011
1012         if (!strcmp("lock_nolock", proto)) {
1013                 lm = &nolock_ops;
1014                 sdp->sd_args.ar_localflocks = 1;
1015                 sdp->sd_args.ar_localcaching = 1;
1016 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1017         } else if (!strcmp("lock_dlm", proto)) {
1018                 lm = &gfs2_dlm_ops;
1019 #endif
1020         } else {
1021                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1022                 return -ENOENT;
1023         }
1024
1025         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1026
1027         ls->ls_ops = lm;
1028         ls->ls_first = 1;
1029
1030         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1031                 substring_t tmp[MAX_OPT_ARGS];
1032                 int token, option;
1033
1034                 if (!o || !*o)
1035                         continue;
1036
1037                 token = match_token(o, *lm->lm_tokens, tmp);
1038                 switch (token) {
1039                 case Opt_jid:
1040                         ret = match_int(&tmp[0], &option);
1041                         if (ret || option < 0)
1042                                 goto hostdata_error;
1043                         ls->ls_jid = option;
1044                         break;
1045                 case Opt_id:
1046                         /* Obsolete, but left for backward compat purposes */
1047                         break;
1048                 case Opt_first:
1049                         ret = match_int(&tmp[0], &option);
1050                         if (ret || (option != 0 && option != 1))
1051                                 goto hostdata_error;
1052                         ls->ls_first = option;
1053                         break;
1054                 case Opt_nodir:
1055                         ret = match_int(&tmp[0], &option);
1056                         if (ret || (option != 0 && option != 1))
1057                                 goto hostdata_error;
1058                         ls->ls_nodir = option;
1059                         break;
1060                 case Opt_err:
1061                 default:
1062 hostdata_error:
1063                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1064                         return -EINVAL;
1065                 }
1066         }
1067
1068         if (sdp->sd_args.ar_spectator)
1069                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1070         else
1071                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1072                          sdp->sd_lockstruct.ls_jid);
1073
1074         fsname = strchr(table, ':');
1075         if (fsname)
1076                 fsname++;
1077         if (lm->lm_mount == NULL) {
1078                 fs_info(sdp, "Now mounting FS...\n");
1079                 return 0;
1080         }
1081         ret = lm->lm_mount(sdp, fsname);
1082         if (ret == 0)
1083                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1084         return ret;
1085 }
1086
1087 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1088 {
1089         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1090         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1091             lm->lm_unmount)
1092                 lm->lm_unmount(sdp);
1093 }
1094
1095 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1096 {
1097         struct super_block *sb = sdp->sd_vfs;
1098         char ro[20];
1099         char spectator[20];
1100         char *envp[] = { ro, spectator, NULL };
1101         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1102         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1103         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1104 }
1105
1106 /**
1107  * fill_super - Read in superblock
1108  * @sb: The VFS superblock
1109  * @data: Mount options
1110  * @silent: Don't complain if it's not a GFS2 filesystem
1111  *
1112  * Returns: errno
1113  */
1114
1115 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1116 {
1117         struct gfs2_sbd *sdp;
1118         struct gfs2_holder mount_gh;
1119         int error;
1120
1121         sdp = init_sbd(sb);
1122         if (!sdp) {
1123                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1124                 return -ENOMEM;
1125         }
1126         sdp->sd_args = *args;
1127
1128         if (sdp->sd_args.ar_spectator) {
1129                 sb->s_flags |= MS_RDONLY;
1130                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1131         }
1132         if (sdp->sd_args.ar_posix_acl)
1133                 sb->s_flags |= MS_POSIXACL;
1134         if (sdp->sd_args.ar_nobarrier)
1135                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1136
1137         sb->s_magic = GFS2_MAGIC;
1138         sb->s_op = &gfs2_super_ops;
1139         sb->s_export_op = &gfs2_export_ops;
1140         sb->s_xattr = gfs2_xattr_handlers;
1141         sb->s_qcop = &gfs2_quotactl_ops;
1142         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1143         sb->s_time_gran = 1;
1144         sb->s_maxbytes = MAX_LFS_FILESIZE;
1145
1146         /* Set up the buffer cache and fill in some fake block size values
1147            to allow us to read-in the on-disk superblock. */
1148         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1149         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1150         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1151                                GFS2_BASIC_BLOCK_SHIFT;
1152         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1153
1154         sdp->sd_tune.gt_log_flush_secs = sdp->sd_args.ar_commit;
1155         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1156         if (sdp->sd_args.ar_statfs_quantum) {
1157                 sdp->sd_tune.gt_statfs_slow = 0;
1158                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1159         }
1160         else {
1161                 sdp->sd_tune.gt_statfs_slow = 1;
1162                 sdp->sd_tune.gt_statfs_quantum = 30;
1163         }
1164
1165         error = init_names(sdp, silent);
1166         if (error)
1167                 goto fail;
1168
1169         gfs2_create_debugfs_file(sdp);
1170
1171         error = gfs2_sys_fs_add(sdp);
1172         if (error)
1173                 goto fail;
1174
1175         error = gfs2_lm_mount(sdp, silent);
1176         if (error)
1177                 goto fail_sys;
1178
1179         error = init_locking(sdp, &mount_gh, DO);
1180         if (error)
1181                 goto fail_lm;
1182
1183         error = init_sb(sdp, silent);
1184         if (error)
1185                 goto fail_locking;
1186
1187         error = init_inodes(sdp, DO);
1188         if (error)
1189                 goto fail_sb;
1190
1191         error = init_per_node(sdp, DO);
1192         if (error)
1193                 goto fail_inodes;
1194
1195         error = gfs2_statfs_init(sdp);
1196         if (error) {
1197                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1198                 goto fail_per_node;
1199         }
1200
1201         error = init_threads(sdp, DO);
1202         if (error)
1203                 goto fail_per_node;
1204
1205         if (!(sb->s_flags & MS_RDONLY)) {
1206                 error = gfs2_make_fs_rw(sdp);
1207                 if (error) {
1208                         fs_err(sdp, "can't make FS RW: %d\n", error);
1209                         goto fail_threads;
1210                 }
1211         }
1212
1213         gfs2_glock_dq_uninit(&mount_gh);
1214         gfs2_online_uevent(sdp);
1215         return 0;
1216
1217 fail_threads:
1218         init_threads(sdp, UNDO);
1219 fail_per_node:
1220         init_per_node(sdp, UNDO);
1221 fail_inodes:
1222         init_inodes(sdp, UNDO);
1223 fail_sb:
1224         if (sdp->sd_root_dir)
1225                 dput(sdp->sd_root_dir);
1226         if (sdp->sd_master_dir)
1227                 dput(sdp->sd_master_dir);
1228         if (sb->s_root)
1229                 dput(sb->s_root);
1230         sb->s_root = NULL;
1231 fail_locking:
1232         init_locking(sdp, &mount_gh, UNDO);
1233 fail_lm:
1234         gfs2_gl_hash_clear(sdp);
1235         gfs2_lm_unmount(sdp);
1236         while (invalidate_inodes(sb))
1237                 yield();
1238 fail_sys:
1239         gfs2_sys_fs_del(sdp);
1240 fail:
1241         gfs2_delete_debugfs_file(sdp);
1242         kfree(sdp);
1243         sb->s_fs_info = NULL;
1244         return error;
1245 }
1246
1247 static int set_gfs2_super(struct super_block *s, void *data)
1248 {
1249         s->s_bdev = data;
1250         s->s_dev = s->s_bdev->bd_dev;
1251
1252         /*
1253          * We set the bdi here to the queue backing, file systems can
1254          * overwrite this in ->fill_super()
1255          */
1256         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1257         return 0;
1258 }
1259
1260 static int test_gfs2_super(struct super_block *s, void *ptr)
1261 {
1262         struct block_device *bdev = ptr;
1263         return (bdev == s->s_bdev);
1264 }
1265
1266 /**
1267  * gfs2_get_sb - Get the GFS2 superblock
1268  * @fs_type: The GFS2 filesystem type
1269  * @flags: Mount flags
1270  * @dev_name: The name of the device
1271  * @data: The mount arguments
1272  * @mnt: The vfsmnt for this mount
1273  *
1274  * Q. Why not use get_sb_bdev() ?
1275  * A. We need to select one of two root directories to mount, independent
1276  *    of whether this is the initial, or subsequent, mount of this sb
1277  *
1278  * Returns: 0 or -ve on error
1279  */
1280
1281 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1282                        const char *dev_name, void *data, struct vfsmount *mnt)
1283 {
1284         struct block_device *bdev;
1285         struct super_block *s;
1286         fmode_t mode = FMODE_READ;
1287         int error;
1288         struct gfs2_args args;
1289         struct gfs2_sbd *sdp;
1290
1291         if (!(flags & MS_RDONLY))
1292                 mode |= FMODE_WRITE;
1293
1294         bdev = open_bdev_exclusive(dev_name, mode, fs_type);
1295         if (IS_ERR(bdev))
1296                 return PTR_ERR(bdev);
1297
1298         /*
1299          * once the super is inserted into the list by sget, s_umount
1300          * will protect the lockfs code from trying to start a snapshot
1301          * while we are mounting
1302          */
1303         mutex_lock(&bdev->bd_fsfreeze_mutex);
1304         if (bdev->bd_fsfreeze_count > 0) {
1305                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1306                 error = -EBUSY;
1307                 goto error_bdev;
1308         }
1309         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1310         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1311         error = PTR_ERR(s);
1312         if (IS_ERR(s))
1313                 goto error_bdev;
1314
1315         memset(&args, 0, sizeof(args));
1316         args.ar_quota = GFS2_QUOTA_DEFAULT;
1317         args.ar_data = GFS2_DATA_DEFAULT;
1318         args.ar_commit = 60;
1319         args.ar_statfs_quantum = 30;
1320         args.ar_quota_quantum = 60;
1321         args.ar_errors = GFS2_ERRORS_DEFAULT;
1322
1323         error = gfs2_mount_args(&args, data);
1324         if (error) {
1325                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1326                 if (s->s_root)
1327                         goto error_super;
1328                 deactivate_locked_super(s);
1329                 return error;
1330         }
1331
1332         if (s->s_root) {
1333                 error = -EBUSY;
1334                 if ((flags ^ s->s_flags) & MS_RDONLY)
1335                         goto error_super;
1336                 close_bdev_exclusive(bdev, mode);
1337         } else {
1338                 char b[BDEVNAME_SIZE];
1339
1340                 s->s_flags = flags;
1341                 s->s_mode = mode;
1342                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1343                 sb_set_blocksize(s, block_size(bdev));
1344                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1345                 if (error) {
1346                         deactivate_locked_super(s);
1347                         return error;
1348                 }
1349                 s->s_flags |= MS_ACTIVE;
1350                 bdev->bd_super = s;
1351         }
1352
1353         sdp = s->s_fs_info;
1354         mnt->mnt_sb = s;
1355         if (args.ar_meta)
1356                 mnt->mnt_root = dget(sdp->sd_master_dir);
1357         else
1358                 mnt->mnt_root = dget(sdp->sd_root_dir);
1359         return 0;
1360
1361 error_super:
1362         deactivate_locked_super(s);
1363 error_bdev:
1364         close_bdev_exclusive(bdev, mode);
1365         return error;
1366 }
1367
1368 static int set_meta_super(struct super_block *s, void *ptr)
1369 {
1370         return -EINVAL;
1371 }
1372
1373 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1374                             const char *dev_name, void *data, struct vfsmount *mnt)
1375 {
1376         struct super_block *s;
1377         struct gfs2_sbd *sdp;
1378         struct path path;
1379         int error;
1380
1381         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1382         if (error) {
1383                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1384                        dev_name, error);
1385                 return error;
1386         }
1387         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1388                  path.dentry->d_inode->i_sb->s_bdev);
1389         path_put(&path);
1390         if (IS_ERR(s)) {
1391                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1392                 return PTR_ERR(s);
1393         }
1394         if ((flags ^ s->s_flags) & MS_RDONLY) {
1395                 deactivate_locked_super(s);
1396                 return -EBUSY;
1397         }
1398         sdp = s->s_fs_info;
1399         mnt->mnt_sb = s;
1400         mnt->mnt_root = dget(sdp->sd_master_dir);
1401         return 0;
1402 }
1403
1404 static void gfs2_kill_sb(struct super_block *sb)
1405 {
1406         struct gfs2_sbd *sdp = sb->s_fs_info;
1407
1408         if (sdp == NULL) {
1409                 kill_block_super(sb);
1410                 return;
1411         }
1412
1413         gfs2_meta_syncfs(sdp);
1414         dput(sdp->sd_root_dir);
1415         dput(sdp->sd_master_dir);
1416         sdp->sd_root_dir = NULL;
1417         sdp->sd_master_dir = NULL;
1418         shrink_dcache_sb(sb);
1419         kill_block_super(sb);
1420         gfs2_delete_debugfs_file(sdp);
1421         kfree(sdp);
1422 }
1423
1424 struct file_system_type gfs2_fs_type = {
1425         .name = "gfs2",
1426         .fs_flags = FS_REQUIRES_DEV,
1427         .get_sb = gfs2_get_sb,
1428         .kill_sb = gfs2_kill_sb,
1429         .owner = THIS_MODULE,
1430 };
1431
1432 struct file_system_type gfs2meta_fs_type = {
1433         .name = "gfs2meta",
1434         .fs_flags = FS_REQUIRES_DEV,
1435         .get_sb = gfs2_get_sb_meta,
1436         .owner = THIS_MODULE,
1437 };
1438