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/lm_interface.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "bmap.h"
  25 #include "daemon.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.h"
  29 #include "mount.h"
  30 #include "ops_fstype.h"
  31 #include "ops_dentry.h"
  32 #include "ops_super.h"
  33 #include "recovery.h"
  34 #include "rgrp.h"
  35 #include "super.h"
  36 #include "sys.h"
  37 #include "util.h"
  38 #include "log.h"
  39
  40 #define DO 0
  41 #define UNDO 1
  42
  43 static const u32 gfs2_old_fs_formats[] = {
  44         0
  45 };
  46
  47 static const u32 gfs2_old_multihost_formats[] = {
  48         0
  49 };
  50
  51 /**
  52  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  53  * @gt: tune
  54  *
  55  */
  56
  57 static void gfs2_tune_init(struct gfs2_tune *gt)
  58 {
  59         spin_lock_init(&gt->gt_spin);
  60
  61         gt->gt_demote_secs = 300;
  62         gt->gt_incore_log_blocks = 1024;
  63         gt->gt_log_flush_secs = 60;
  64         gt->gt_recoverd_secs = 60;
  65         gt->gt_logd_secs = 1;
  66         gt->gt_quotad_secs = 5;
  67         gt->gt_quota_simul_sync = 64;
  68         gt->gt_quota_warn_period = 10;
  69         gt->gt_quota_scale_num = 1;
  70         gt->gt_quota_scale_den = 1;
  71         gt->gt_quota_cache_secs = 300;
  72         gt->gt_quota_quantum = 60;
  73         gt->gt_new_files_jdata = 0;
  74         gt->gt_max_readahead = 1 << 18;
  75         gt->gt_stall_secs = 600;
  76         gt->gt_complain_secs = 10;
  77         gt->gt_statfs_quantum = 30;
  78         gt->gt_statfs_slow = 0;
  79 }
  80
  81 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  82 {
  83         struct gfs2_sbd *sdp;
  84
  85         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  86         if (!sdp)
  87                 return NULL;
  88
  89         sb->s_fs_info = sdp;
  90         sdp->sd_vfs = sb;
  91
  92         gfs2_tune_init(&sdp->sd_tune);
  93
  94         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  95         spin_lock_init(&sdp->sd_reclaim_lock);
  96         init_waitqueue_head(&sdp->sd_reclaim_wq);
  97
  98         mutex_init(&sdp->sd_inum_mutex);
  99         spin_lock_init(&sdp->sd_statfs_spin);
 100
 101         spin_lock_init(&sdp->sd_rindex_spin);
 102         mutex_init(&sdp->sd_rindex_mutex);
 103         INIT_LIST_HEAD(&sdp->sd_rindex_list);
 104         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
 105
 106         INIT_LIST_HEAD(&sdp->sd_jindex_list);
 107         spin_lock_init(&sdp->sd_jindex_spin);
 108         mutex_init(&sdp->sd_jindex_mutex);
 109
 110         INIT_LIST_HEAD(&sdp->sd_quota_list);
 111         spin_lock_init(&sdp->sd_quota_spin);
 112         mutex_init(&sdp->sd_quota_mutex);
 113
 114         spin_lock_init(&sdp->sd_log_lock);
 115
 116         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 117         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 118         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 119         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 120         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 121
 122         mutex_init(&sdp->sd_log_reserve_mutex);
 123         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 124         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 125
 126         init_rwsem(&sdp->sd_log_flush_lock);
 127         atomic_set(&sdp->sd_log_in_flight, 0);
 128         init_waitqueue_head(&sdp->sd_log_flush_wait);
 129
 130         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 131
 132         mutex_init(&sdp->sd_freeze_lock);
 133
 134         return sdp;
 135 }
 136
 137
 138 /**
 139  * gfs2_check_sb - Check superblock
 140  * @sdp: the filesystem
 141  * @sb: The superblock
 142  * @silent: Don't print a message if the check fails
 143  *
 144  * Checks the version code of the FS is one that we understand how to
 145  * read and that the sizes of the various on-disk structures have not
 146  * changed.
 147  */
 148
 149 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 150 {
 151         unsigned int x;
 152
 153         if (sb->sb_magic != GFS2_MAGIC ||
 154             sb->sb_type != GFS2_METATYPE_SB) {
 155                 if (!silent)
 156                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 157                 return -EINVAL;
 158         }
 159
 160         /*  If format numbers match exactly, we're done.  */
 161
 162         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 163             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 164                 return 0;
 165
 166         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 167                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 168                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 169                                 break;
 170
 171                 if (!gfs2_old_fs_formats[x]) {
 172                         printk(KERN_WARNING
 173                                "GFS2: code version (%u, %u) is incompatible "
 174                                "with ondisk format (%u, %u)\n",
 175                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 176                                sb->sb_fs_format, sb->sb_multihost_format);
 177                         printk(KERN_WARNING
 178                                "GFS2: I don't know how to upgrade this FS\n");
 179                         return -EINVAL;
 180                 }
 181         }
 182
 183         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 184                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 185                         if (gfs2_old_multihost_formats[x] ==
 186                             sb->sb_multihost_format)
 187                                 break;
 188
 189                 if (!gfs2_old_multihost_formats[x]) {
 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_WARNING
 196                                "GFS2: I don't know how to upgrade this FS\n");
 197                         return -EINVAL;
 198                 }
 199         }
 200
 201         if (!sdp->sd_args.ar_upgrade) {
 202                 printk(KERN_WARNING
 203                        "GFS2: code version (%u, %u) is incompatible "
 204                        "with ondisk format (%u, %u)\n",
 205                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 206                        sb->sb_fs_format, sb->sb_multihost_format);
 207                 printk(KERN_INFO
 208                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 209                        "the FS\n");
 210                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 211                 return -EINVAL;
 212         }
 213
 214         return 0;
 215 }
 216
 217 static void end_bio_io_page(struct bio *bio, int error)
 218 {
 219         struct page *page = bio->bi_private;
 220
 221         if (!error)
 222                 SetPageUptodate(page);
 223         else
 224                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 225         unlock_page(page);
 226 }
 227
 228 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 229 {
 230         const struct gfs2_sb *str = buf;
 231
 232         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 233         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 234         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 235         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 236         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 237         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 238         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 239         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 240         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 241         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 242         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 243
 244         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 245         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 246 }
 247
 248 /**
 249  * gfs2_read_super - Read the gfs2 super block from disk
 250  * @sdp: The GFS2 super block
 251  * @sector: The location of the super block
 252  * @error: The error code to return
 253  *
 254  * This uses the bio functions to read the super block from disk
 255  * because we want to be 100% sure that we never read cached data.
 256  * A super block is read twice only during each GFS2 mount and is
 257  * never written to by the filesystem. The first time its read no
 258  * locks are held, and the only details which are looked at are those
 259  * relating to the locking protocol. Once locking is up and working,
 260  * the sb is read again under the lock to establish the location of
 261  * the master directory (contains pointers to journals etc) and the
 262  * root directory.
 263  *
 264  * Returns: 0 on success or error
 265  */
 266
 267 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 268 {
 269         struct super_block *sb = sdp->sd_vfs;
 270         struct gfs2_sb *p;
 271         struct page *page;
 272         struct bio *bio;
 273
 274         page = alloc_page(GFP_NOFS);
 275         if (unlikely(!page))
 276                 return -ENOBUFS;
 277
 278         ClearPageUptodate(page);
 279         ClearPageDirty(page);
 280         lock_page(page);
 281
 282         bio = bio_alloc(GFP_NOFS, 1);
 283         if (unlikely(!bio)) {
 284                 __free_page(page);
 285                 return -ENOBUFS;
 286         }
 287
 288         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 289         bio->bi_bdev = sb->s_bdev;
 290         bio_add_page(bio, page, PAGE_SIZE, 0);
 291
 292         bio->bi_end_io = end_bio_io_page;
 293         bio->bi_private = page;
 294         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 295         wait_on_page_locked(page);
 296         bio_put(bio);
 297         if (!PageUptodate(page)) {
 298                 __free_page(page);
 299                 return -EIO;
 300         }
 301         p = kmap(page);
 302         gfs2_sb_in(&sdp->sd_sb, p);
 303         kunmap(page);
 304         __free_page(page);
 305         return 0;
 306 }
 307 /**
 308  * gfs2_read_sb - Read super block
 309  * @sdp: The GFS2 superblock
 310  * @gl: the glock for the superblock (assumed to be held)
 311  * @silent: Don't print message if mount fails
 312  *
 313  */
 314
 315 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
 316 {
 317         u32 hash_blocks, ind_blocks, leaf_blocks;
 318         u32 tmp_blocks;
 319         unsigned int x;
 320         int error;
 321
 322         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 323         if (error) {
 324                 if (!silent)
 325                         fs_err(sdp, "can't read superblock\n");
 326                 return error;
 327         }
 328
 329         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 330         if (error)
 331                 return error;
 332
 333         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 334                                GFS2_BASIC_BLOCK_SHIFT;
 335         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 336         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 337                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 338         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 339                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 340         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 341         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 342         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 343         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 344         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 345                                 sizeof(struct gfs2_meta_header)) /
 346                                 sizeof(struct gfs2_quota_change);
 347
 348         /* Compute maximum reservation required to add a entry to a directory */
 349
 350         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 351                              sdp->sd_jbsize);
 352
 353         ind_blocks = 0;
 354         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 355                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 356                 ind_blocks += tmp_blocks;
 357         }
 358
 359         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 360
 361         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 362
 363         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 364                                 sizeof(struct gfs2_dinode);
 365         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 366         for (x = 2;; x++) {
 367                 u64 space, d;
 368                 u32 m;
 369
 370                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 371                 d = space;
 372                 m = do_div(d, sdp->sd_inptrs);
 373
 374                 if (d != sdp->sd_heightsize[x - 1] || m)
 375                         break;
 376                 sdp->sd_heightsize[x] = space;
 377         }
 378         sdp->sd_max_height = x;
 379         sdp->sd_heightsize[x] = ~0;
 380         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 381
 382         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 383                                  sizeof(struct gfs2_dinode);
 384         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 385         for (x = 2;; x++) {
 386                 u64 space, d;
 387                 u32 m;
 388
 389                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 390                 d = space;
 391                 m = do_div(d, sdp->sd_inptrs);
 392
 393                 if (d != sdp->sd_jheightsize[x - 1] || m)
 394                         break;
 395                 sdp->sd_jheightsize[x] = space;
 396         }
 397         sdp->sd_max_jheight = x;
 398         sdp->sd_jheightsize[x] = ~0;
 399         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 400
 401         return 0;
 402 }
 403
 404 static int init_names(struct gfs2_sbd *sdp, int silent)
 405 {
 406         char *proto, *table;
 407         int error = 0;
 408
 409         proto = sdp->sd_args.ar_lockproto;
 410         table = sdp->sd_args.ar_locktable;
 411
 412         /*  Try to autodetect  */
 413
 414         if (!proto[0] || !table[0]) {
 415                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 416                 if (error)
 417                         return error;
 418
 419                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 420                 if (error)
 421                         goto out;
 422
 423                 if (!proto[0])
 424                         proto = sdp->sd_sb.sb_lockproto;
 425                 if (!table[0])
 426                         table = sdp->sd_sb.sb_locktable;
 427         }
 428
 429         if (!table[0])
 430                 table = sdp->sd_vfs->s_id;
 431
 432         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 433         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 434
 435         table = sdp->sd_table_name;
 436         while ((table = strchr(table, '/')))
 437                 *table = '_';
 438
 439 out:
 440         return error;
 441 }
 442
 443 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 444                         int undo)
 445 {
 446         struct task_struct *p;
 447         int error = 0;
 448
 449         if (undo)
 450                 goto fail_trans;
 451
 452         for (sdp->sd_glockd_num = 0;
 453              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 454              sdp->sd_glockd_num++) {
 455                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 456                 error = IS_ERR(p);
 457                 if (error) {
 458                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 459                         goto fail;
 460                 }
 461                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 462         }
 463
 464         error = gfs2_glock_nq_num(sdp,
 465                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 466                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 467                                   mount_gh);
 468         if (error) {
 469                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 470                 goto fail;
 471         }
 472
 473         error = gfs2_glock_nq_num(sdp,
 474                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 475                                   LM_ST_SHARED,
 476                                   LM_FLAG_NOEXP | GL_EXACT,
 477                                   &sdp->sd_live_gh);
 478         if (error) {
 479                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 480                 goto fail_mount;
 481         }
 482
 483         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 484                                CREATE, &sdp->sd_rename_gl);
 485         if (error) {
 486                 fs_err(sdp, "can't create rename glock: %d\n", error);
 487                 goto fail_live;
 488         }
 489
 490         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 491                                CREATE, &sdp->sd_trans_gl);
 492         if (error) {
 493                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 494                 goto fail_rename;
 495         }
 496         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 497
 498         return 0;
 499
 500 fail_trans:
 501         gfs2_glock_put(sdp->sd_trans_gl);
 502 fail_rename:
 503         gfs2_glock_put(sdp->sd_rename_gl);
 504 fail_live:
 505         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 506 fail_mount:
 507         gfs2_glock_dq_uninit(mount_gh);
 508 fail:
 509         while (sdp->sd_glockd_num--)
 510                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 511
 512         return error;
 513 }
 514
 515 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 516                             u64 no_addr, const char *name)
 517 {
 518         struct gfs2_sbd *sdp = sb->s_fs_info;
 519         struct dentry *dentry;
 520         struct inode *inode;
 521
 522         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 523         if (IS_ERR(inode)) {
 524                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 525                 return PTR_ERR(inode);
 526         }
 527         dentry = d_alloc_root(inode);
 528         if (!dentry) {
 529                 fs_err(sdp, "can't alloc %s dentry\n", name);
 530                 iput(inode);
 531                 return -ENOMEM;
 532         }
 533         dentry->d_op = &gfs2_dops;
 534         *dptr = dentry;
 535         return 0;
 536 }
 537
 538 static int init_sb(struct gfs2_sbd *sdp, int silent)
 539 {
 540         struct super_block *sb = sdp->sd_vfs;
 541         struct gfs2_holder sb_gh;
 542         u64 no_addr;
 543         int ret;
 544
 545         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 546                                 LM_ST_SHARED, 0, &sb_gh);
 547         if (ret) {
 548                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 549                 return ret;
 550         }
 551
 552         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 553         if (ret) {
 554                 fs_err(sdp, "can't read superblock: %d\n", ret);
 555                 goto out;
 556         }
 557
 558         /* Set up the buffer cache and SB for real */
 559         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 560                 ret = -EINVAL;
 561                 fs_err(sdp, "FS block size (%u) is too small for device "
 562                        "block size (%u)\n",
 563                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 564                 goto out;
 565         }
 566         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 567                 ret = -EINVAL;
 568                 fs_err(sdp, "FS block size (%u) is too big for machine "
 569                        "page size (%u)\n",
 570                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 571                 goto out;
 572         }
 573         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 574
 575         /* Get the root inode */
 576         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 577         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 578         if (ret)
 579                 goto out;
 580
 581         /* Get the master inode */
 582         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 583         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 584         if (ret) {
 585                 dput(sdp->sd_root_dir);
 586                 goto out;
 587         }
 588         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 589 out:
 590         gfs2_glock_dq_uninit(&sb_gh);
 591         return ret;
 592 }
 593
 594 /**
 595  * map_journal_extents - create a reusable "extent" mapping from all logical
 596  * blocks to all physical blocks for the given journal.  This will save
 597  * us time when writing journal blocks.  Most journals will have only one
 598  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 599  * arranges the journal blocks sequentially to maximize performance.
 600  * So the extent would map the first block for the entire file length.
 601  * However, gfs2_jadd can happen while file activity is happening, so
 602  * those journals may not be sequential.  Less likely is the case where
 603  * the users created their own journals by mounting the metafs and
 604  * laying it out.  But it's still possible.  These journals might have
 605  * several extents.
 606  *
 607  * TODO: This should be done in bigger chunks rather than one block at a time,
 608  *       but since it's only done at mount time, I'm not worried about the
 609  *       time it takes.
 610  */
 611 static int map_journal_extents(struct gfs2_sbd *sdp)
 612 {
 613         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 614         unsigned int lb;
 615         u64 db, prev_db; /* logical block, disk block, prev disk block */
 616         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 617         struct gfs2_journal_extent *jext = NULL;
 618         struct buffer_head bh;
 619         int rc = 0;
 620
 621         prev_db = 0;
 622
 623         for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
 624                 bh.b_state = 0;
 625                 bh.b_blocknr = 0;
 626                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 627                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 628                 db = bh.b_blocknr;
 629                 if (rc || !db) {
 630                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 631                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 632                         break;
 633                 }
 634                 if (!prev_db || db != prev_db + 1) {
 635                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 636                                        GFP_KERNEL);
 637                         if (!jext) {
 638                                 printk(KERN_INFO "GFS2 error: out of memory "
 639                                        "mapping journal extents.\n");
 640                                 rc = -ENOMEM;
 641                                 break;
 642                         }
 643                         jext->dblock = db;
 644                         jext->lblock = lb;
 645                         jext->blocks = 1;
 646                         list_add_tail(&jext->extent_list, &jd->extent_list);
 647                 } else {
 648                         jext->blocks++;
 649                 }
 650                 prev_db = db;
 651         }
 652         return rc;
 653 }
 654
 655 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
 656 {
 657         if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
 658                 return;
 659         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 660                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
 661                                         sdp->sd_lockstruct.ls_lockspace);
 662 }
 663
 664 static int init_journal(struct gfs2_sbd *sdp, int undo)
 665 {
 666         struct inode *master = sdp->sd_master_dir->d_inode;
 667         struct gfs2_holder ji_gh;
 668         struct task_struct *p;
 669         struct gfs2_inode *ip;
 670         int jindex = 1;
 671         int error = 0;
 672
 673         if (undo) {
 674                 jindex = 0;
 675                 goto fail_recoverd;
 676         }
 677
 678         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 679         if (IS_ERR(sdp->sd_jindex)) {
 680                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 681                 return PTR_ERR(sdp->sd_jindex);
 682         }
 683         ip = GFS2_I(sdp->sd_jindex);
 684         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 685
 686         /* Load in the journal index special file */
 687
 688         error = gfs2_jindex_hold(sdp, &ji_gh);
 689         if (error) {
 690                 fs_err(sdp, "can't read journal index: %d\n", error);
 691                 goto fail;
 692         }
 693
 694         error = -EINVAL;
 695         if (!gfs2_jindex_size(sdp)) {
 696                 fs_err(sdp, "no journals!\n");
 697                 goto fail_jindex;
 698         }
 699
 700         if (sdp->sd_args.ar_spectator) {
 701                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 702                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 703         } else {
 704                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 705                         fs_err(sdp, "can't mount journal #%u\n",
 706                                sdp->sd_lockstruct.ls_jid);
 707                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 708                                gfs2_jindex_size(sdp),
 709                                gfs2_jindex_size(sdp) - 1);
 710                         goto fail_jindex;
 711                 }
 712                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 713
 714                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 715                                           &gfs2_journal_glops,
 716                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 717                                           &sdp->sd_journal_gh);
 718                 if (error) {
 719                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 720                         goto fail_jindex;
 721                 }
 722
 723                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 724                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 725                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 726                                            &sdp->sd_jinode_gh);
 727                 if (error) {
 728                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 729                                error);
 730                         goto fail_journal_gh;
 731                 }
 732
 733                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 734                 if (error) {
 735                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 736                                sdp->sd_jdesc->jd_jid, error);
 737                         goto fail_jinode_gh;
 738                 }
 739                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 740
 741                 /* Map the extents for this journal's blocks */
 742                 map_journal_extents(sdp);
 743         }
 744
 745         if (sdp->sd_lockstruct.ls_first) {
 746                 unsigned int x;
 747                 for (x = 0; x < sdp->sd_journals; x++) {
 748                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 749                         if (error) {
 750                                 fs_err(sdp, "error recovering journal %u: %d\n",
 751                                        x, error);
 752                                 goto fail_jinode_gh;
 753                         }
 754                 }
 755
 756                 gfs2_lm_others_may_mount(sdp);
 757         } else if (!sdp->sd_args.ar_spectator) {
 758                 error = gfs2_recover_journal(sdp->sd_jdesc);
 759                 if (error) {
 760                         fs_err(sdp, "error recovering my journal: %d\n", error);
 761                         goto fail_jinode_gh;
 762                 }
 763         }
 764
 765         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 766         gfs2_glock_dq_uninit(&ji_gh);
 767         jindex = 0;
 768
 769         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 770         error = IS_ERR(p);
 771         if (error) {
 772                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 773                 goto fail_jinode_gh;
 774         }
 775         sdp->sd_recoverd_process = p;
 776
 777         return 0;
 778
 779 fail_recoverd:
 780         kthread_stop(sdp->sd_recoverd_process);
 781 fail_jinode_gh:
 782         if (!sdp->sd_args.ar_spectator)
 783                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 784 fail_journal_gh:
 785         if (!sdp->sd_args.ar_spectator)
 786                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 787 fail_jindex:
 788         gfs2_jindex_free(sdp);
 789         if (jindex)
 790                 gfs2_glock_dq_uninit(&ji_gh);
 791 fail:
 792         iput(sdp->sd_jindex);
 793         return error;
 794 }
 795
 796
 797 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 798 {
 799         int error = 0;
 800         struct gfs2_inode *ip;
 801         struct inode *master = sdp->sd_master_dir->d_inode;
 802
 803         if (undo)
 804                 goto fail_qinode;
 805
 806         error = init_journal(sdp, undo);
 807         if (error)
 808                 goto fail;
 809
 810         /* Read in the master inode number inode */
 811         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 812         if (IS_ERR(sdp->sd_inum_inode)) {
 813                 error = PTR_ERR(sdp->sd_inum_inode);
 814                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 815                 goto fail_journal;
 816         }
 817
 818
 819         /* Read in the master statfs inode */
 820         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 821         if (IS_ERR(sdp->sd_statfs_inode)) {
 822                 error = PTR_ERR(sdp->sd_statfs_inode);
 823                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 824                 goto fail_inum;
 825         }
 826
 827         /* Read in the resource index inode */
 828         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 829         if (IS_ERR(sdp->sd_rindex)) {
 830                 error = PTR_ERR(sdp->sd_rindex);
 831                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 832                 goto fail_statfs;
 833         }
 834         ip = GFS2_I(sdp->sd_rindex);
 835         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 836         sdp->sd_rindex_uptodate = 0;
 837
 838         /* Read in the quota inode */
 839         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 840         if (IS_ERR(sdp->sd_quota_inode)) {
 841                 error = PTR_ERR(sdp->sd_quota_inode);
 842                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 843                 goto fail_rindex;
 844         }
 845         return 0;
 846
 847 fail_qinode:
 848         iput(sdp->sd_quota_inode);
 849 fail_rindex:
 850         gfs2_clear_rgrpd(sdp);
 851         iput(sdp->sd_rindex);
 852 fail_statfs:
 853         iput(sdp->sd_statfs_inode);
 854 fail_inum:
 855         iput(sdp->sd_inum_inode);
 856 fail_journal:
 857         init_journal(sdp, UNDO);
 858 fail:
 859         return error;
 860 }
 861
 862 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 863 {
 864         struct inode *pn = NULL;
 865         char buf[30];
 866         int error = 0;
 867         struct gfs2_inode *ip;
 868         struct inode *master = sdp->sd_master_dir->d_inode;
 869
 870         if (sdp->sd_args.ar_spectator)
 871                 return 0;
 872
 873         if (undo)
 874                 goto fail_qc_gh;
 875
 876         pn = gfs2_lookup_simple(master, "per_node");
 877         if (IS_ERR(pn)) {
 878                 error = PTR_ERR(pn);
 879                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 880                 return error;
 881         }
 882
 883         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 884         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 885         if (IS_ERR(sdp->sd_ir_inode)) {
 886                 error = PTR_ERR(sdp->sd_ir_inode);
 887                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 888                 goto fail;
 889         }
 890
 891         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 892         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 893         if (IS_ERR(sdp->sd_sc_inode)) {
 894                 error = PTR_ERR(sdp->sd_sc_inode);
 895                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 896                 goto fail_ir_i;
 897         }
 898
 899         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 900         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 901         if (IS_ERR(sdp->sd_qc_inode)) {
 902                 error = PTR_ERR(sdp->sd_qc_inode);
 903                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 904                 goto fail_ut_i;
 905         }
 906
 907         iput(pn);
 908         pn = NULL;
 909
 910         ip = GFS2_I(sdp->sd_ir_inode);
 911         error = gfs2_glock_nq_init(ip->i_gl,
 912                                    LM_ST_EXCLUSIVE, 0,
 913                                    &sdp->sd_ir_gh);
 914         if (error) {
 915                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 916                 goto fail_qc_i;
 917         }
 918
 919         ip = GFS2_I(sdp->sd_sc_inode);
 920         error = gfs2_glock_nq_init(ip->i_gl,
 921                                    LM_ST_EXCLUSIVE, 0,
 922                                    &sdp->sd_sc_gh);
 923         if (error) {
 924                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 925                 goto fail_ir_gh;
 926         }
 927
 928         ip = GFS2_I(sdp->sd_qc_inode);
 929         error = gfs2_glock_nq_init(ip->i_gl,
 930                                    LM_ST_EXCLUSIVE, 0,
 931                                    &sdp->sd_qc_gh);
 932         if (error) {
 933                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 934                 goto fail_ut_gh;
 935         }
 936
 937         return 0;
 938
 939 fail_qc_gh:
 940         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 941 fail_ut_gh:
 942         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 943 fail_ir_gh:
 944         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 945 fail_qc_i:
 946         iput(sdp->sd_qc_inode);
 947 fail_ut_i:
 948         iput(sdp->sd_sc_inode);
 949 fail_ir_i:
 950         iput(sdp->sd_ir_inode);
 951 fail:
 952         if (pn)
 953                 iput(pn);
 954         return error;
 955 }
 956
 957 static int init_threads(struct gfs2_sbd *sdp, int undo)
 958 {
 959         struct task_struct *p;
 960         int error = 0;
 961
 962         if (undo)
 963                 goto fail_quotad;
 964
 965         sdp->sd_log_flush_time = jiffies;
 966         sdp->sd_jindex_refresh_time = jiffies;
 967
 968         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 969         error = IS_ERR(p);
 970         if (error) {
 971                 fs_err(sdp, "can't start logd thread: %d\n", error);
 972                 return error;
 973         }
 974         sdp->sd_logd_process = p;
 975
 976         sdp->sd_statfs_sync_time = jiffies;
 977         sdp->sd_quota_sync_time = jiffies;
 978
 979         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 980         error = IS_ERR(p);
 981         if (error) {
 982                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 983                 goto fail;
 984         }
 985         sdp->sd_quotad_process = p;
 986
 987         return 0;
 988
 989
 990 fail_quotad:
 991         kthread_stop(sdp->sd_quotad_process);
 992 fail:
 993         kthread_stop(sdp->sd_logd_process);
 994         return error;
 995 }
 996
 997 /**
 998  * gfs2_lm_mount - mount a locking protocol
 999  * @sdp: the filesystem
1000  * @args: mount arguements
1001  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1002  *
1003  * Returns: errno
1004  */
1005
1006 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1007 {
1008         char *proto = sdp->sd_proto_name;
1009         char *table = sdp->sd_table_name;
1010         int flags = LM_MFLAG_CONV_NODROP;
1011         int error;
1012
1013         if (sdp->sd_args.ar_spectator)
1014                 flags |= LM_MFLAG_SPECTATOR;
1015
1016         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1017
1018         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
1019                                      gfs2_glock_cb, sdp,
1020                                      GFS2_MIN_LVB_SIZE, flags,
1021                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
1022         if (error) {
1023                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
1024                         proto, table, sdp->sd_args.ar_hostdata);
1025                 goto out;
1026         }
1027
1028         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
1029             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
1030                                   GFS2_MIN_LVB_SIZE)) {
1031                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1032                 goto out;
1033         }
1034
1035         if (sdp->sd_args.ar_spectator)
1036                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1037         else
1038                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1039                          sdp->sd_lockstruct.ls_jid);
1040
1041         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1042
1043         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
1044             !sdp->sd_args.ar_ignore_local_fs) {
1045                 sdp->sd_args.ar_localflocks = 1;
1046                 sdp->sd_args.ar_localcaching = 1;
1047         }
1048
1049 out:
1050         return error;
1051 }
1052
1053 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1054 {
1055         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
1056                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1057 }
1058
1059 /**
1060  * fill_super - Read in superblock
1061  * @sb: The VFS superblock
1062  * @data: Mount options
1063  * @silent: Don't complain if it's not a GFS2 filesystem
1064  *
1065  * Returns: errno
1066  */
1067
1068 static int fill_super(struct super_block *sb, void *data, int silent)
1069 {
1070         struct gfs2_sbd *sdp;
1071         struct gfs2_holder mount_gh;
1072         int error;
1073
1074         sdp = init_sbd(sb);
1075         if (!sdp) {
1076                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1077                 return -ENOMEM;
1078         }
1079
1080         error = gfs2_mount_args(sdp, (char *)data, 0);
1081         if (error) {
1082                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1083                 goto fail;
1084         }
1085
1086         sb->s_magic = GFS2_MAGIC;
1087         sb->s_op = &gfs2_super_ops;
1088         sb->s_export_op = &gfs2_export_ops;
1089         sb->s_time_gran = 1;
1090         sb->s_maxbytes = MAX_LFS_FILESIZE;
1091
1092         /* Set up the buffer cache and fill in some fake block size values
1093            to allow us to read-in the on-disk superblock. */
1094         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1095         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1096         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1097                                GFS2_BASIC_BLOCK_SHIFT;
1098         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1099
1100         error = init_names(sdp, silent);
1101         if (error)
1102                 goto fail;
1103
1104         gfs2_create_debugfs_file(sdp);
1105
1106         error = gfs2_sys_fs_add(sdp);
1107         if (error)
1108                 goto fail;
1109
1110         error = gfs2_lm_mount(sdp, silent);
1111         if (error)
1112                 goto fail_sys;
1113
1114         error = init_locking(sdp, &mount_gh, DO);
1115         if (error)
1116                 goto fail_lm;
1117
1118         error = init_sb(sdp, silent);
1119         if (error)
1120                 goto fail_locking;
1121
1122         error = init_inodes(sdp, DO);
1123         if (error)
1124                 goto fail_sb;
1125
1126         error = init_per_node(sdp, DO);
1127         if (error)
1128                 goto fail_inodes;
1129
1130         error = gfs2_statfs_init(sdp);
1131         if (error) {
1132                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1133                 goto fail_per_node;
1134         }
1135
1136         error = init_threads(sdp, DO);
1137         if (error)
1138                 goto fail_per_node;
1139
1140         if (!(sb->s_flags & MS_RDONLY)) {
1141                 error = gfs2_make_fs_rw(sdp);
1142                 if (error) {
1143                         fs_err(sdp, "can't make FS RW: %d\n", error);
1144                         goto fail_threads;
1145                 }
1146         }
1147
1148         gfs2_glock_dq_uninit(&mount_gh);
1149
1150         return 0;
1151
1152 fail_threads:
1153         init_threads(sdp, UNDO);
1154 fail_per_node:
1155         init_per_node(sdp, UNDO);
1156 fail_inodes:
1157         init_inodes(sdp, UNDO);
1158 fail_sb:
1159         if (sdp->sd_root_dir)
1160                 dput(sdp->sd_root_dir);
1161         if (sdp->sd_master_dir)
1162                 dput(sdp->sd_master_dir);
1163         sb->s_root = NULL;
1164 fail_locking:
1165         init_locking(sdp, &mount_gh, UNDO);
1166 fail_lm:
1167         gfs2_gl_hash_clear(sdp);
1168         gfs2_lm_unmount(sdp);
1169         while (invalidate_inodes(sb))
1170                 yield();
1171 fail_sys:
1172         gfs2_sys_fs_del(sdp);
1173 fail:
1174         gfs2_delete_debugfs_file(sdp);
1175         kfree(sdp);
1176         sb->s_fs_info = NULL;
1177         return error;
1178 }
1179
1180 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1181                        const char *dev_name, void *data, struct vfsmount *mnt)
1182 {
1183         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1184 }
1185
1186 static struct super_block *get_gfs2_sb(const char *dev_name)
1187 {
1188         struct super_block *sb;
1189         struct nameidata nd;
1190         int error;
1191
1192         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1193         if (error) {
1194                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1195                        dev_name, error);
1196                 return NULL;
1197         }
1198         sb = nd.path.dentry->d_inode->i_sb;
1199         if (sb && (sb->s_type == &gfs2_fs_type))
1200                 atomic_inc(&sb->s_active);
1201         else
1202                 sb = NULL;
1203         path_put(&nd.path);
1204         return sb;
1205 }
1206
1207 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1208                             const char *dev_name, void *data, struct vfsmount *mnt)
1209 {
1210         struct super_block *sb = NULL;
1211         struct gfs2_sbd *sdp;
1212
1213         sb = get_gfs2_sb(dev_name);
1214         if (!sb) {
1215                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1216                 return -ENOENT;
1217         }
1218         sdp = sb->s_fs_info;
1219         mnt->mnt_sb = sb;
1220         mnt->mnt_root = dget(sdp->sd_master_dir);
1221         return 0;
1222 }
1223
1224 static void gfs2_kill_sb(struct super_block *sb)
1225 {
1226         struct gfs2_sbd *sdp = sb->s_fs_info;
1227         if (sdp) {
1228                 gfs2_meta_syncfs(sdp);
1229                 dput(sdp->sd_root_dir);
1230                 dput(sdp->sd_master_dir);
1231                 sdp->sd_root_dir = NULL;
1232                 sdp->sd_master_dir = NULL;
1233         }
1234         shrink_dcache_sb(sb);
1235         kill_block_super(sb);
1236         if (sdp)
1237                 gfs2_delete_debugfs_file(sdp);
1238 }
1239
1240 struct file_system_type gfs2_fs_type = {
1241         .name = "gfs2",
1242         .fs_flags = FS_REQUIRES_DEV,
1243         .get_sb = gfs2_get_sb,
1244         .kill_sb = gfs2_kill_sb,
1245         .owner = THIS_MODULE,
1246 };
1247
1248 struct file_system_type gfs2meta_fs_type = {
1249         .name = "gfs2meta",
1250         .fs_flags = FS_REQUIRES_DEV,
1251         .get_sb = gfs2_get_sb_meta,
1252         .owner = THIS_MODULE,
1253 };
1254