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_quota_simul_sync = 64;
  61         gt->gt_quota_warn_period = 10;
  62         gt->gt_quota_scale_num = 1;
  63         gt->gt_quota_scale_den = 1;
  64         gt->gt_new_files_jdata = 0;
  65         gt->gt_max_readahead = 1 << 18;
  66         gt->gt_complain_secs = 10;
  67 }
  68
  69 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  70 {
  71         struct gfs2_sbd *sdp;
  72
  73         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  74         if (!sdp)
  75                 return NULL;
  76
  77         sb->s_fs_info = sdp;
  78         sdp->sd_vfs = sb;
  79
  80         gfs2_tune_init(&sdp->sd_tune);
  81
  82         init_waitqueue_head(&sdp->sd_glock_wait);
  83         atomic_set(&sdp->sd_glock_disposal, 0);
  84         spin_lock_init(&sdp->sd_statfs_spin);
  85
  86         spin_lock_init(&sdp->sd_rindex_spin);
  87         mutex_init(&sdp->sd_rindex_mutex);
  88         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  89         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  90
  91         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  92         spin_lock_init(&sdp->sd_jindex_spin);
  93         mutex_init(&sdp->sd_jindex_mutex);
  94
  95         INIT_LIST_HEAD(&sdp->sd_quota_list);
  96         mutex_init(&sdp->sd_quota_mutex);
  97         init_waitqueue_head(&sdp->sd_quota_wait);
  98         INIT_LIST_HEAD(&sdp->sd_trunc_list);
  99         spin_lock_init(&sdp->sd_trunc_lock);
 100
 101         spin_lock_init(&sdp->sd_log_lock);
 102         atomic_set(&sdp->sd_log_pinned, 0);
 103         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 104         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 105         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 106         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 107         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 108
 109         init_waitqueue_head(&sdp->sd_log_waitq);
 110         init_waitqueue_head(&sdp->sd_logd_waitq);
 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);
 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 = -EUSERS;
 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                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 736                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 737         } else {
 738                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 739                         fs_err(sdp, "can't mount journal #%u\n",
 740                                sdp->sd_lockstruct.ls_jid);
 741                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 742                                gfs2_jindex_size(sdp),
 743                                gfs2_jindex_size(sdp) - 1);
 744                         goto fail_jindex;
 745                 }
 746                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 747
 748                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 749                                           &gfs2_journal_glops,
 750                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 751                                           &sdp->sd_journal_gh);
 752                 if (error) {
 753                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 754                         goto fail_jindex;
 755                 }
 756
 757                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 758                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 759                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 760                                            &sdp->sd_jinode_gh);
 761                 if (error) {
 762                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 763                                error);
 764                         goto fail_journal_gh;
 765                 }
 766
 767                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 768                 if (error) {
 769                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 770                                sdp->sd_jdesc->jd_jid, error);
 771                         goto fail_jinode_gh;
 772                 }
 773                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 774                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 775                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 776
 777                 /* Map the extents for this journal's blocks */
 778                 map_journal_extents(sdp);
 779         }
 780         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 781
 782         if (sdp->sd_lockstruct.ls_first) {
 783                 unsigned int x;
 784                 for (x = 0; x < sdp->sd_journals; x++) {
 785                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 786                         if (error) {
 787                                 fs_err(sdp, "error recovering journal %u: %d\n",
 788                                        x, error);
 789                                 goto fail_jinode_gh;
 790                         }
 791                 }
 792
 793                 gfs2_others_may_mount(sdp);
 794         } else if (!sdp->sd_args.ar_spectator) {
 795                 error = gfs2_recover_journal(sdp->sd_jdesc);
 796                 if (error) {
 797                         fs_err(sdp, "error recovering my journal: %d\n", error);
 798                         goto fail_jinode_gh;
 799                 }
 800         }
 801
 802         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 803         gfs2_glock_dq_uninit(&ji_gh);
 804         jindex = 0;
 805
 806         return 0;
 807
 808 fail_jinode_gh:
 809         if (!sdp->sd_args.ar_spectator)
 810                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 811 fail_journal_gh:
 812         if (!sdp->sd_args.ar_spectator)
 813                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 814 fail_jindex:
 815         gfs2_jindex_free(sdp);
 816         if (jindex)
 817                 gfs2_glock_dq_uninit(&ji_gh);
 818 fail:
 819         iput(sdp->sd_jindex);
 820         return error;
 821 }
 822
 823
 824 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 825 {
 826         int error = 0;
 827         struct gfs2_inode *ip;
 828         struct inode *master = sdp->sd_master_dir->d_inode;
 829
 830         if (undo)
 831                 goto fail_qinode;
 832
 833         error = init_journal(sdp, undo);
 834         if (error)
 835                 goto fail;
 836
 837         /* Read in the master statfs inode */
 838         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 839         if (IS_ERR(sdp->sd_statfs_inode)) {
 840                 error = PTR_ERR(sdp->sd_statfs_inode);
 841                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 842                 goto fail_journal;
 843         }
 844
 845         /* Read in the resource index inode */
 846         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 847         if (IS_ERR(sdp->sd_rindex)) {
 848                 error = PTR_ERR(sdp->sd_rindex);
 849                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 850                 goto fail_statfs;
 851         }
 852         ip = GFS2_I(sdp->sd_rindex);
 853         sdp->sd_rindex_uptodate = 0;
 854
 855         /* Read in the quota inode */
 856         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 857         if (IS_ERR(sdp->sd_quota_inode)) {
 858                 error = PTR_ERR(sdp->sd_quota_inode);
 859                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 860                 goto fail_rindex;
 861         }
 862         return 0;
 863
 864 fail_qinode:
 865         iput(sdp->sd_quota_inode);
 866 fail_rindex:
 867         gfs2_clear_rgrpd(sdp);
 868         iput(sdp->sd_rindex);
 869 fail_statfs:
 870         iput(sdp->sd_statfs_inode);
 871 fail_journal:
 872         init_journal(sdp, UNDO);
 873 fail:
 874         return error;
 875 }
 876
 877 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 878 {
 879         struct inode *pn = NULL;
 880         char buf[30];
 881         int error = 0;
 882         struct gfs2_inode *ip;
 883         struct inode *master = sdp->sd_master_dir->d_inode;
 884
 885         if (sdp->sd_args.ar_spectator)
 886                 return 0;
 887
 888         if (undo)
 889                 goto fail_qc_gh;
 890
 891         pn = gfs2_lookup_simple(master, "per_node");
 892         if (IS_ERR(pn)) {
 893                 error = PTR_ERR(pn);
 894                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 895                 return error;
 896         }
 897
 898         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 899         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 900         if (IS_ERR(sdp->sd_sc_inode)) {
 901                 error = PTR_ERR(sdp->sd_sc_inode);
 902                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 903                 goto fail;
 904         }
 905
 906         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 907         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 908         if (IS_ERR(sdp->sd_qc_inode)) {
 909                 error = PTR_ERR(sdp->sd_qc_inode);
 910                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 911                 goto fail_ut_i;
 912         }
 913
 914         iput(pn);
 915         pn = NULL;
 916
 917         ip = GFS2_I(sdp->sd_sc_inode);
 918         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 919                                    &sdp->sd_sc_gh);
 920         if (error) {
 921                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 922                 goto fail_qc_i;
 923         }
 924
 925         ip = GFS2_I(sdp->sd_qc_inode);
 926         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 927                                    &sdp->sd_qc_gh);
 928         if (error) {
 929                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 930                 goto fail_ut_gh;
 931         }
 932
 933         return 0;
 934
 935 fail_qc_gh:
 936         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 937 fail_ut_gh:
 938         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 939 fail_qc_i:
 940         iput(sdp->sd_qc_inode);
 941 fail_ut_i:
 942         iput(sdp->sd_sc_inode);
 943 fail:
 944         if (pn)
 945                 iput(pn);
 946         return error;
 947 }
 948
 949 static int init_threads(struct gfs2_sbd *sdp, int undo)
 950 {
 951         struct task_struct *p;
 952         int error = 0;
 953
 954         if (undo)
 955                 goto fail_quotad;
 956
 957         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 958         error = IS_ERR(p);
 959         if (error) {
 960                 fs_err(sdp, "can't start logd thread: %d\n", error);
 961                 return error;
 962         }
 963         sdp->sd_logd_process = p;
 964
 965         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 966         error = IS_ERR(p);
 967         if (error) {
 968                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 969                 goto fail;
 970         }
 971         sdp->sd_quotad_process = p;
 972
 973         return 0;
 974
 975
 976 fail_quotad:
 977         kthread_stop(sdp->sd_quotad_process);
 978 fail:
 979         kthread_stop(sdp->sd_logd_process);
 980         return error;
 981 }
 982
 983 static const match_table_t nolock_tokens = {
 984         { Opt_jid, "jid=%d\n", },
 985         { Opt_err, NULL },
 986 };
 987
 988 static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)
 989 {
 990         struct gfs2_sbd *sdp = gl->gl_sbd;
 991         kmem_cache_free(cachep, gl);
 992         if (atomic_dec_and_test(&sdp->sd_glock_disposal))
 993                 wake_up(&sdp->sd_glock_wait);
 994 }
 995
 996 static const struct lm_lockops nolock_ops = {
 997         .lm_proto_name = "lock_nolock",
 998         .lm_put_lock = nolock_put_lock,
 999         .lm_tokens = &nolock_tokens,
1000 };
1001
1002 /**
1003  * gfs2_lm_mount - mount a locking protocol
1004  * @sdp: the filesystem
1005  * @args: mount arguments
1006  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1007  *
1008  * Returns: errno
1009  */
1010
1011 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1012 {
1013         const struct lm_lockops *lm;
1014         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1015         struct gfs2_args *args = &sdp->sd_args;
1016         const char *proto = sdp->sd_proto_name;
1017         const char *table = sdp->sd_table_name;
1018         const char *fsname;
1019         char *o, *options;
1020         int ret;
1021
1022         if (!strcmp("lock_nolock", proto)) {
1023                 lm = &nolock_ops;
1024                 sdp->sd_args.ar_localflocks = 1;
1025                 sdp->sd_args.ar_localcaching = 1;
1026 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1027         } else if (!strcmp("lock_dlm", proto)) {
1028                 lm = &gfs2_dlm_ops;
1029 #endif
1030         } else {
1031                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1032                 return -ENOENT;
1033         }
1034
1035         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1036
1037         ls->ls_ops = lm;
1038         ls->ls_first = 1;
1039
1040         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1041                 substring_t tmp[MAX_OPT_ARGS];
1042                 int token, option;
1043
1044                 if (!o || !*o)
1045                         continue;
1046
1047                 token = match_token(o, *lm->lm_tokens, tmp);
1048                 switch (token) {
1049                 case Opt_jid:
1050                         ret = match_int(&tmp[0], &option);
1051                         if (ret || option < 0)
1052                                 goto hostdata_error;
1053                         ls->ls_jid = option;
1054                         break;
1055                 case Opt_id:
1056                         /* Obsolete, but left for backward compat purposes */
1057                         break;
1058                 case Opt_first:
1059                         ret = match_int(&tmp[0], &option);
1060                         if (ret || (option != 0 && option != 1))
1061                                 goto hostdata_error;
1062                         ls->ls_first = option;
1063                         break;
1064                 case Opt_nodir:
1065                         ret = match_int(&tmp[0], &option);
1066                         if (ret || (option != 0 && option != 1))
1067                                 goto hostdata_error;
1068                         ls->ls_nodir = option;
1069                         break;
1070                 case Opt_err:
1071                 default:
1072 hostdata_error:
1073                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1074                         return -EINVAL;
1075                 }
1076         }
1077
1078         if (sdp->sd_args.ar_spectator)
1079                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1080         else
1081                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1082                          sdp->sd_lockstruct.ls_jid);
1083
1084         fsname = strchr(table, ':');
1085         if (fsname)
1086                 fsname++;
1087         if (lm->lm_mount == NULL) {
1088                 fs_info(sdp, "Now mounting FS...\n");
1089                 return 0;
1090         }
1091         ret = lm->lm_mount(sdp, fsname);
1092         if (ret == 0)
1093                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1094         return ret;
1095 }
1096
1097 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1098 {
1099         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1100         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1101             lm->lm_unmount)
1102                 lm->lm_unmount(sdp);
1103 }
1104
1105 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1106 {
1107         struct super_block *sb = sdp->sd_vfs;
1108         char ro[20];
1109         char spectator[20];
1110         char *envp[] = { ro, spectator, NULL };
1111         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1112         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1113         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1114 }
1115
1116 /**
1117  * fill_super - Read in superblock
1118  * @sb: The VFS superblock
1119  * @data: Mount options
1120  * @silent: Don't complain if it's not a GFS2 filesystem
1121  *
1122  * Returns: errno
1123  */
1124
1125 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1126 {
1127         struct gfs2_sbd *sdp;
1128         struct gfs2_holder mount_gh;
1129         int error;
1130
1131         sdp = init_sbd(sb);
1132         if (!sdp) {
1133                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1134                 return -ENOMEM;
1135         }
1136         sdp->sd_args = *args;
1137
1138         if (sdp->sd_args.ar_spectator) {
1139                 sb->s_flags |= MS_RDONLY;
1140                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1141         }
1142         if (sdp->sd_args.ar_posix_acl)
1143                 sb->s_flags |= MS_POSIXACL;
1144         if (sdp->sd_args.ar_nobarrier)
1145                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1146
1147         sb->s_magic = GFS2_MAGIC;
1148         sb->s_op = &gfs2_super_ops;
1149         sb->s_export_op = &gfs2_export_ops;
1150         sb->s_xattr = gfs2_xattr_handlers;
1151         sb->s_qcop = &gfs2_quotactl_ops;
1152         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1153         sb->s_time_gran = 1;
1154         sb->s_maxbytes = MAX_LFS_FILESIZE;
1155
1156         /* Set up the buffer cache and fill in some fake block size values
1157            to allow us to read-in the on-disk superblock. */
1158         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1159         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1160         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1161                                GFS2_BASIC_BLOCK_SHIFT;
1162         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1163
1164         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1165         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1166         if (sdp->sd_args.ar_statfs_quantum) {
1167                 sdp->sd_tune.gt_statfs_slow = 0;
1168                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1169         }
1170         else {
1171                 sdp->sd_tune.gt_statfs_slow = 1;
1172                 sdp->sd_tune.gt_statfs_quantum = 30;
1173         }
1174
1175         error = init_names(sdp, silent);
1176         if (error)
1177                 goto fail;
1178
1179         gfs2_create_debugfs_file(sdp);
1180
1181         error = gfs2_sys_fs_add(sdp);
1182         if (error)
1183                 goto fail;
1184
1185         error = gfs2_lm_mount(sdp, silent);
1186         if (error)
1187                 goto fail_sys;
1188
1189         error = init_locking(sdp, &mount_gh, DO);
1190         if (error)
1191                 goto fail_lm;
1192
1193         error = init_sb(sdp, silent);
1194         if (error)
1195                 goto fail_locking;
1196
1197         error = init_inodes(sdp, DO);
1198         if (error)
1199                 goto fail_sb;
1200
1201         error = init_per_node(sdp, DO);
1202         if (error)
1203                 goto fail_inodes;
1204
1205         error = gfs2_statfs_init(sdp);
1206         if (error) {
1207                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1208                 goto fail_per_node;
1209         }
1210
1211         error = init_threads(sdp, DO);
1212         if (error)
1213                 goto fail_per_node;
1214
1215         if (!(sb->s_flags & MS_RDONLY)) {
1216                 error = gfs2_make_fs_rw(sdp);
1217                 if (error) {
1218                         fs_err(sdp, "can't make FS RW: %d\n", error);
1219                         goto fail_threads;
1220                 }
1221         }
1222
1223         gfs2_glock_dq_uninit(&mount_gh);
1224         gfs2_online_uevent(sdp);
1225         return 0;
1226
1227 fail_threads:
1228         init_threads(sdp, UNDO);
1229 fail_per_node:
1230         init_per_node(sdp, UNDO);
1231 fail_inodes:
1232         init_inodes(sdp, UNDO);
1233 fail_sb:
1234         if (sdp->sd_root_dir)
1235                 dput(sdp->sd_root_dir);
1236         if (sdp->sd_master_dir)
1237                 dput(sdp->sd_master_dir);
1238         if (sb->s_root)
1239                 dput(sb->s_root);
1240         sb->s_root = NULL;
1241 fail_locking:
1242         init_locking(sdp, &mount_gh, UNDO);
1243 fail_lm:
1244         invalidate_inodes(sb);
1245         gfs2_gl_hash_clear(sdp);
1246         gfs2_lm_unmount(sdp);
1247 fail_sys:
1248         gfs2_sys_fs_del(sdp);
1249 fail:
1250         gfs2_delete_debugfs_file(sdp);
1251         kfree(sdp);
1252         sb->s_fs_info = NULL;
1253         return error;
1254 }
1255
1256 static int set_gfs2_super(struct super_block *s, void *data)
1257 {
1258         s->s_bdev = data;
1259         s->s_dev = s->s_bdev->bd_dev;
1260
1261         /*
1262          * We set the bdi here to the queue backing, file systems can
1263          * overwrite this in ->fill_super()
1264          */
1265         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1266         return 0;
1267 }
1268
1269 static int test_gfs2_super(struct super_block *s, void *ptr)
1270 {
1271         struct block_device *bdev = ptr;
1272         return (bdev == s->s_bdev);
1273 }
1274
1275 /**
1276  * gfs2_get_sb - Get the GFS2 superblock
1277  * @fs_type: The GFS2 filesystem type
1278  * @flags: Mount flags
1279  * @dev_name: The name of the device
1280  * @data: The mount arguments
1281  * @mnt: The vfsmnt for this mount
1282  *
1283  * Q. Why not use get_sb_bdev() ?
1284  * A. We need to select one of two root directories to mount, independent
1285  *    of whether this is the initial, or subsequent, mount of this sb
1286  *
1287  * Returns: 0 or -ve on error
1288  */
1289
1290 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1291                        const char *dev_name, void *data, struct vfsmount *mnt)
1292 {
1293         struct block_device *bdev;
1294         struct super_block *s;
1295         fmode_t mode = FMODE_READ;
1296         int error;
1297         struct gfs2_args args;
1298         struct gfs2_sbd *sdp;
1299
1300         if (!(flags & MS_RDONLY))
1301                 mode |= FMODE_WRITE;
1302
1303         bdev = open_bdev_exclusive(dev_name, mode, fs_type);
1304         if (IS_ERR(bdev))
1305                 return PTR_ERR(bdev);
1306
1307         /*
1308          * once the super is inserted into the list by sget, s_umount
1309          * will protect the lockfs code from trying to start a snapshot
1310          * while we are mounting
1311          */
1312         mutex_lock(&bdev->bd_fsfreeze_mutex);
1313         if (bdev->bd_fsfreeze_count > 0) {
1314                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1315                 error = -EBUSY;
1316                 goto error_bdev;
1317         }
1318         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1319         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1320         error = PTR_ERR(s);
1321         if (IS_ERR(s))
1322                 goto error_bdev;
1323
1324         memset(&args, 0, sizeof(args));
1325         args.ar_quota = GFS2_QUOTA_DEFAULT;
1326         args.ar_data = GFS2_DATA_DEFAULT;
1327         args.ar_commit = 30;
1328         args.ar_statfs_quantum = 30;
1329         args.ar_quota_quantum = 60;
1330         args.ar_errors = GFS2_ERRORS_DEFAULT;
1331
1332         error = gfs2_mount_args(&args, data);
1333         if (error) {
1334                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1335                 if (s->s_root)
1336                         goto error_super;
1337                 deactivate_locked_super(s);
1338                 return error;
1339         }
1340
1341         if (s->s_root) {
1342                 error = -EBUSY;
1343                 if ((flags ^ s->s_flags) & MS_RDONLY)
1344                         goto error_super;
1345                 close_bdev_exclusive(bdev, mode);
1346         } else {
1347                 char b[BDEVNAME_SIZE];
1348
1349                 s->s_flags = flags;
1350                 s->s_mode = mode;
1351                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1352                 sb_set_blocksize(s, block_size(bdev));
1353                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1354                 if (error) {
1355                         deactivate_locked_super(s);
1356                         return error;
1357                 }
1358                 s->s_flags |= MS_ACTIVE;
1359                 bdev->bd_super = s;
1360         }
1361
1362         sdp = s->s_fs_info;
1363         mnt->mnt_sb = s;
1364         if (args.ar_meta)
1365                 mnt->mnt_root = dget(sdp->sd_master_dir);
1366         else
1367                 mnt->mnt_root = dget(sdp->sd_root_dir);
1368         return 0;
1369
1370 error_super:
1371         deactivate_locked_super(s);
1372 error_bdev:
1373         close_bdev_exclusive(bdev, mode);
1374         return error;
1375 }
1376
1377 static int set_meta_super(struct super_block *s, void *ptr)
1378 {
1379         return -EINVAL;
1380 }
1381
1382 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1383                             const char *dev_name, void *data, struct vfsmount *mnt)
1384 {
1385         struct super_block *s;
1386         struct gfs2_sbd *sdp;
1387         struct path path;
1388         int error;
1389
1390         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1391         if (error) {
1392                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1393                        dev_name, error);
1394                 return error;
1395         }
1396         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1397                  path.dentry->d_inode->i_sb->s_bdev);
1398         path_put(&path);
1399         if (IS_ERR(s)) {
1400                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1401                 return PTR_ERR(s);
1402         }
1403         if ((flags ^ s->s_flags) & MS_RDONLY) {
1404                 deactivate_locked_super(s);
1405                 return -EBUSY;
1406         }
1407         sdp = s->s_fs_info;
1408         mnt->mnt_sb = s;
1409         mnt->mnt_root = dget(sdp->sd_master_dir);
1410         return 0;
1411 }
1412
1413 static void gfs2_kill_sb(struct super_block *sb)
1414 {
1415         struct gfs2_sbd *sdp = sb->s_fs_info;
1416
1417         if (sdp == NULL) {
1418                 kill_block_super(sb);
1419                 return;
1420         }
1421
1422         gfs2_meta_syncfs(sdp);
1423         dput(sdp->sd_root_dir);
1424         dput(sdp->sd_master_dir);
1425         sdp->sd_root_dir = NULL;
1426         sdp->sd_master_dir = NULL;
1427         shrink_dcache_sb(sb);
1428         kill_block_super(sb);
1429         gfs2_delete_debugfs_file(sdp);
1430         kfree(sdp);
1431 }
1432
1433 struct file_system_type gfs2_fs_type = {
1434         .name = "gfs2",
1435         .fs_flags = FS_REQUIRES_DEV,
1436         .get_sb = gfs2_get_sb,
1437         .kill_sb = gfs2_kill_sb,
1438         .owner = THIS_MODULE,
1439 };
1440
1441 struct file_system_type gfs2meta_fs_type = {
1442         .name = "gfs2meta",
1443         .fs_flags = FS_REQUIRES_DEV,
1444         .get_sb = gfs2_get_sb_meta,
1445         .owner = THIS_MODULE,
1446 };
1447