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_atime_quantum = 3600;
  74         gt->gt_new_files_jdata = 0;
  75         gt->gt_max_readahead = 1 << 18;
  76         gt->gt_stall_secs = 600;
  77         gt->gt_complain_secs = 10;
  78         gt->gt_statfs_quantum = 30;
  79         gt->gt_statfs_slow = 0;
  80 }
  81
  82 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  83 {
  84         struct gfs2_sbd *sdp;
  85
  86         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  87         if (!sdp)
  88                 return NULL;
  89
  90         sb->s_fs_info = sdp;
  91         sdp->sd_vfs = sb;
  92
  93         gfs2_tune_init(&sdp->sd_tune);
  94
  95         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  96         spin_lock_init(&sdp->sd_reclaim_lock);
  97         init_waitqueue_head(&sdp->sd_reclaim_wq);
  98
  99         mutex_init(&sdp->sd_inum_mutex);
 100         spin_lock_init(&sdp->sd_statfs_spin);
 101
 102         spin_lock_init(&sdp->sd_rindex_spin);
 103         mutex_init(&sdp->sd_rindex_mutex);
 104         INIT_LIST_HEAD(&sdp->sd_rindex_list);
 105         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
 106
 107         INIT_LIST_HEAD(&sdp->sd_jindex_list);
 108         spin_lock_init(&sdp->sd_jindex_spin);
 109         mutex_init(&sdp->sd_jindex_mutex);
 110
 111         INIT_LIST_HEAD(&sdp->sd_quota_list);
 112         spin_lock_init(&sdp->sd_quota_spin);
 113         mutex_init(&sdp->sd_quota_mutex);
 114
 115         spin_lock_init(&sdp->sd_log_lock);
 116
 117         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 118         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 119         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 120         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 121         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 122
 123         mutex_init(&sdp->sd_log_reserve_mutex);
 124         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 125         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 126
 127         init_rwsem(&sdp->sd_log_flush_lock);
 128         atomic_set(&sdp->sd_log_in_flight, 0);
 129         init_waitqueue_head(&sdp->sd_log_flush_wait);
 130
 131         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 132
 133         mutex_init(&sdp->sd_freeze_lock);
 134
 135         return sdp;
 136 }
 137
 138 static void init_vfs(struct super_block *sb, unsigned noatime)
 139 {
 140         struct gfs2_sbd *sdp = sb->s_fs_info;
 141
 142         sb->s_magic = GFS2_MAGIC;
 143         sb->s_op = &gfs2_super_ops;
 144         sb->s_export_op = &gfs2_export_ops;
 145         sb->s_time_gran = 1;
 146         sb->s_maxbytes = MAX_LFS_FILESIZE;
 147
 148         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 149                 set_bit(noatime, &sdp->sd_flags);
 150
 151         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 152         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 153 }
 154
 155 /**
 156  * gfs2_check_sb - Check superblock
 157  * @sdp: the filesystem
 158  * @sb: The superblock
 159  * @silent: Don't print a message if the check fails
 160  *
 161  * Checks the version code of the FS is one that we understand how to
 162  * read and that the sizes of the various on-disk structures have not
 163  * changed.
 164  */
 165
 166 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 167 {
 168         unsigned int x;
 169
 170         if (sb->sb_magic != GFS2_MAGIC ||
 171             sb->sb_type != GFS2_METATYPE_SB) {
 172                 if (!silent)
 173                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 174                 return -EINVAL;
 175         }
 176
 177         /*  If format numbers match exactly, we're done.  */
 178
 179         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 180             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 181                 return 0;
 182
 183         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 184                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 185                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 186                                 break;
 187
 188                 if (!gfs2_old_fs_formats[x]) {
 189                         printk(KERN_WARNING
 190                                "GFS2: code version (%u, %u) is incompatible "
 191                                "with ondisk format (%u, %u)\n",
 192                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 193                                sb->sb_fs_format, sb->sb_multihost_format);
 194                         printk(KERN_WARNING
 195                                "GFS2: I don't know how to upgrade this FS\n");
 196                         return -EINVAL;
 197                 }
 198         }
 199
 200         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 201                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 202                         if (gfs2_old_multihost_formats[x] ==
 203                             sb->sb_multihost_format)
 204                                 break;
 205
 206                 if (!gfs2_old_multihost_formats[x]) {
 207                         printk(KERN_WARNING
 208                                "GFS2: code version (%u, %u) is incompatible "
 209                                "with ondisk format (%u, %u)\n",
 210                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 211                                sb->sb_fs_format, sb->sb_multihost_format);
 212                         printk(KERN_WARNING
 213                                "GFS2: I don't know how to upgrade this FS\n");
 214                         return -EINVAL;
 215                 }
 216         }
 217
 218         if (!sdp->sd_args.ar_upgrade) {
 219                 printk(KERN_WARNING
 220                        "GFS2: code version (%u, %u) is incompatible "
 221                        "with ondisk format (%u, %u)\n",
 222                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 223                        sb->sb_fs_format, sb->sb_multihost_format);
 224                 printk(KERN_INFO
 225                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 226                        "the FS\n");
 227                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 228                 return -EINVAL;
 229         }
 230
 231         return 0;
 232 }
 233
 234 static void end_bio_io_page(struct bio *bio, int error)
 235 {
 236         struct page *page = bio->bi_private;
 237
 238         if (!error)
 239                 SetPageUptodate(page);
 240         else
 241                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 242         unlock_page(page);
 243 }
 244
 245 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 246 {
 247         const struct gfs2_sb *str = buf;
 248
 249         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 250         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 251         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 252         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 253         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 254         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 255         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 256         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 257         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 258         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 259         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 260
 261         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 262         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 263 }
 264
 265 /**
 266  * gfs2_read_super - Read the gfs2 super block from disk
 267  * @sdp: The GFS2 super block
 268  * @sector: The location of the super block
 269  * @error: The error code to return
 270  *
 271  * This uses the bio functions to read the super block from disk
 272  * because we want to be 100% sure that we never read cached data.
 273  * A super block is read twice only during each GFS2 mount and is
 274  * never written to by the filesystem. The first time its read no
 275  * locks are held, and the only details which are looked at are those
 276  * relating to the locking protocol. Once locking is up and working,
 277  * the sb is read again under the lock to establish the location of
 278  * the master directory (contains pointers to journals etc) and the
 279  * root directory.
 280  *
 281  * Returns: 0 on success or error
 282  */
 283
 284 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 285 {
 286         struct super_block *sb = sdp->sd_vfs;
 287         struct gfs2_sb *p;
 288         struct page *page;
 289         struct bio *bio;
 290
 291         page = alloc_page(GFP_NOFS);
 292         if (unlikely(!page))
 293                 return -ENOBUFS;
 294
 295         ClearPageUptodate(page);
 296         ClearPageDirty(page);
 297         lock_page(page);
 298
 299         bio = bio_alloc(GFP_NOFS, 1);
 300         if (unlikely(!bio)) {
 301                 __free_page(page);
 302                 return -ENOBUFS;
 303         }
 304
 305         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 306         bio->bi_bdev = sb->s_bdev;
 307         bio_add_page(bio, page, PAGE_SIZE, 0);
 308
 309         bio->bi_end_io = end_bio_io_page;
 310         bio->bi_private = page;
 311         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 312         wait_on_page_locked(page);
 313         bio_put(bio);
 314         if (!PageUptodate(page)) {
 315                 __free_page(page);
 316                 return -EIO;
 317         }
 318         p = kmap(page);
 319         gfs2_sb_in(&sdp->sd_sb, p);
 320         kunmap(page);
 321         __free_page(page);
 322         return 0;
 323 }
 324 /**
 325  * gfs2_read_sb - Read super block
 326  * @sdp: The GFS2 superblock
 327  * @gl: the glock for the superblock (assumed to be held)
 328  * @silent: Don't print message if mount fails
 329  *
 330  */
 331
 332 static int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent)
 333 {
 334         u32 hash_blocks, ind_blocks, leaf_blocks;
 335         u32 tmp_blocks;
 336         unsigned int x;
 337         int error;
 338
 339         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 340         if (error) {
 341                 if (!silent)
 342                         fs_err(sdp, "can't read superblock\n");
 343                 return error;
 344         }
 345
 346         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 347         if (error)
 348                 return error;
 349
 350         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 351                                GFS2_BASIC_BLOCK_SHIFT;
 352         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 353         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 354                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 355         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 356                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 357         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 358         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 359         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 360         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 361         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 362                                 sizeof(struct gfs2_meta_header)) /
 363                                 sizeof(struct gfs2_quota_change);
 364
 365         /* Compute maximum reservation required to add a entry to a directory */
 366
 367         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 368                              sdp->sd_jbsize);
 369
 370         ind_blocks = 0;
 371         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 372                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 373                 ind_blocks += tmp_blocks;
 374         }
 375
 376         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 377
 378         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 379
 380         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 381                                 sizeof(struct gfs2_dinode);
 382         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 383         for (x = 2;; x++) {
 384                 u64 space, d;
 385                 u32 m;
 386
 387                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 388                 d = space;
 389                 m = do_div(d, sdp->sd_inptrs);
 390
 391                 if (d != sdp->sd_heightsize[x - 1] || m)
 392                         break;
 393                 sdp->sd_heightsize[x] = space;
 394         }
 395         sdp->sd_max_height = x;
 396         sdp->sd_heightsize[x] = ~0;
 397         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 398
 399         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 400                                  sizeof(struct gfs2_dinode);
 401         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 402         for (x = 2;; x++) {
 403                 u64 space, d;
 404                 u32 m;
 405
 406                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 407                 d = space;
 408                 m = do_div(d, sdp->sd_inptrs);
 409
 410                 if (d != sdp->sd_jheightsize[x - 1] || m)
 411                         break;
 412                 sdp->sd_jheightsize[x] = space;
 413         }
 414         sdp->sd_max_jheight = x;
 415         sdp->sd_jheightsize[x] = ~0;
 416         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 417
 418         return 0;
 419 }
 420
 421 static int init_names(struct gfs2_sbd *sdp, int silent)
 422 {
 423         char *proto, *table;
 424         int error = 0;
 425
 426         proto = sdp->sd_args.ar_lockproto;
 427         table = sdp->sd_args.ar_locktable;
 428
 429         /*  Try to autodetect  */
 430
 431         if (!proto[0] || !table[0]) {
 432                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 433                 if (error)
 434                         return error;
 435
 436                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 437                 if (error)
 438                         goto out;
 439
 440                 if (!proto[0])
 441                         proto = sdp->sd_sb.sb_lockproto;
 442                 if (!table[0])
 443                         table = sdp->sd_sb.sb_locktable;
 444         }
 445
 446         if (!table[0])
 447                 table = sdp->sd_vfs->s_id;
 448
 449         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 450         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 451
 452         table = sdp->sd_table_name;
 453         while ((table = strchr(table, '/')))
 454                 *table = '_';
 455
 456 out:
 457         return error;
 458 }
 459
 460 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 461                         int undo)
 462 {
 463         struct task_struct *p;
 464         int error = 0;
 465
 466         if (undo)
 467                 goto fail_trans;
 468
 469         for (sdp->sd_glockd_num = 0;
 470              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 471              sdp->sd_glockd_num++) {
 472                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 473                 error = IS_ERR(p);
 474                 if (error) {
 475                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 476                         goto fail;
 477                 }
 478                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 479         }
 480
 481         error = gfs2_glock_nq_num(sdp,
 482                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 483                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 484                                   mount_gh);
 485         if (error) {
 486                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 487                 goto fail;
 488         }
 489
 490         error = gfs2_glock_nq_num(sdp,
 491                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 492                                   LM_ST_SHARED,
 493                                   LM_FLAG_NOEXP | GL_EXACT,
 494                                   &sdp->sd_live_gh);
 495         if (error) {
 496                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 497                 goto fail_mount;
 498         }
 499
 500         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 501                                CREATE, &sdp->sd_rename_gl);
 502         if (error) {
 503                 fs_err(sdp, "can't create rename glock: %d\n", error);
 504                 goto fail_live;
 505         }
 506
 507         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 508                                CREATE, &sdp->sd_trans_gl);
 509         if (error) {
 510                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 511                 goto fail_rename;
 512         }
 513         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 514
 515         return 0;
 516
 517 fail_trans:
 518         gfs2_glock_put(sdp->sd_trans_gl);
 519 fail_rename:
 520         gfs2_glock_put(sdp->sd_rename_gl);
 521 fail_live:
 522         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 523 fail_mount:
 524         gfs2_glock_dq_uninit(mount_gh);
 525 fail:
 526         while (sdp->sd_glockd_num--)
 527                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 528
 529         return error;
 530 }
 531
 532 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 533                             u64 no_addr, const char *name)
 534 {
 535         struct gfs2_sbd *sdp = sb->s_fs_info;
 536         struct dentry *dentry;
 537         struct inode *inode;
 538
 539         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 540         if (IS_ERR(inode)) {
 541                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 542                 return PTR_ERR(inode);
 543         }
 544         dentry = d_alloc_root(inode);
 545         if (!dentry) {
 546                 fs_err(sdp, "can't alloc %s dentry\n", name);
 547                 iput(inode);
 548                 return -ENOMEM;
 549         }
 550         dentry->d_op = &gfs2_dops;
 551         *dptr = dentry;
 552         return 0;
 553 }
 554
 555 static int init_sb(struct gfs2_sbd *sdp, int silent)
 556 {
 557         struct super_block *sb = sdp->sd_vfs;
 558         struct gfs2_holder sb_gh;
 559         u64 no_addr;
 560         int ret;
 561
 562         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 563                                 LM_ST_SHARED, 0, &sb_gh);
 564         if (ret) {
 565                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 566                 return ret;
 567         }
 568
 569         ret = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 570         if (ret) {
 571                 fs_err(sdp, "can't read superblock: %d\n", ret);
 572                 goto out;
 573         }
 574
 575         /* Set up the buffer cache and SB for real */
 576         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 577                 ret = -EINVAL;
 578                 fs_err(sdp, "FS block size (%u) is too small for device "
 579                        "block size (%u)\n",
 580                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 581                 goto out;
 582         }
 583         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 584                 ret = -EINVAL;
 585                 fs_err(sdp, "FS block size (%u) is too big for machine "
 586                        "page size (%u)\n",
 587                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 588                 goto out;
 589         }
 590         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 591
 592         /* Get the root inode */
 593         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 594         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 595         if (ret)
 596                 goto out;
 597
 598         /* Get the master inode */
 599         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 600         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 601         if (ret) {
 602                 dput(sdp->sd_root_dir);
 603                 goto out;
 604         }
 605         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 606 out:
 607         gfs2_glock_dq_uninit(&sb_gh);
 608         return ret;
 609 }
 610
 611 /**
 612  * map_journal_extents - create a reusable "extent" mapping from all logical
 613  * blocks to all physical blocks for the given journal.  This will save
 614  * us time when writing journal blocks.  Most journals will have only one
 615  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 616  * arranges the journal blocks sequentially to maximize performance.
 617  * So the extent would map the first block for the entire file length.
 618  * However, gfs2_jadd can happen while file activity is happening, so
 619  * those journals may not be sequential.  Less likely is the case where
 620  * the users created their own journals by mounting the metafs and
 621  * laying it out.  But it's still possible.  These journals might have
 622  * several extents.
 623  *
 624  * TODO: This should be done in bigger chunks rather than one block at a time,
 625  *       but since it's only done at mount time, I'm not worried about the
 626  *       time it takes.
 627  */
 628 static int map_journal_extents(struct gfs2_sbd *sdp)
 629 {
 630         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 631         unsigned int lb;
 632         u64 db, prev_db; /* logical block, disk block, prev disk block */
 633         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 634         struct gfs2_journal_extent *jext = NULL;
 635         struct buffer_head bh;
 636         int rc = 0;
 637
 638         prev_db = 0;
 639
 640         for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
 641                 bh.b_state = 0;
 642                 bh.b_blocknr = 0;
 643                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 644                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 645                 db = bh.b_blocknr;
 646                 if (rc || !db) {
 647                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 648                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 649                         break;
 650                 }
 651                 if (!prev_db || db != prev_db + 1) {
 652                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 653                                        GFP_KERNEL);
 654                         if (!jext) {
 655                                 printk(KERN_INFO "GFS2 error: out of memory "
 656                                        "mapping journal extents.\n");
 657                                 rc = -ENOMEM;
 658                                 break;
 659                         }
 660                         jext->dblock = db;
 661                         jext->lblock = lb;
 662                         jext->blocks = 1;
 663                         list_add_tail(&jext->extent_list, &jd->extent_list);
 664                 } else {
 665                         jext->blocks++;
 666                 }
 667                 prev_db = db;
 668         }
 669         return rc;
 670 }
 671
 672 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
 673 {
 674         if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
 675                 return;
 676         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 677                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
 678                                         sdp->sd_lockstruct.ls_lockspace);
 679 }
 680
 681 static int init_journal(struct gfs2_sbd *sdp, int undo)
 682 {
 683         struct inode *master = sdp->sd_master_dir->d_inode;
 684         struct gfs2_holder ji_gh;
 685         struct task_struct *p;
 686         struct gfs2_inode *ip;
 687         int jindex = 1;
 688         int error = 0;
 689
 690         if (undo) {
 691                 jindex = 0;
 692                 goto fail_recoverd;
 693         }
 694
 695         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 696         if (IS_ERR(sdp->sd_jindex)) {
 697                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 698                 return PTR_ERR(sdp->sd_jindex);
 699         }
 700         ip = GFS2_I(sdp->sd_jindex);
 701         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 702
 703         /* Load in the journal index special file */
 704
 705         error = gfs2_jindex_hold(sdp, &ji_gh);
 706         if (error) {
 707                 fs_err(sdp, "can't read journal index: %d\n", error);
 708                 goto fail;
 709         }
 710
 711         error = -EINVAL;
 712         if (!gfs2_jindex_size(sdp)) {
 713                 fs_err(sdp, "no journals!\n");
 714                 goto fail_jindex;
 715         }
 716
 717         if (sdp->sd_args.ar_spectator) {
 718                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 719                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 720         } else {
 721                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 722                         fs_err(sdp, "can't mount journal #%u\n",
 723                                sdp->sd_lockstruct.ls_jid);
 724                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 725                                gfs2_jindex_size(sdp),
 726                                gfs2_jindex_size(sdp) - 1);
 727                         goto fail_jindex;
 728                 }
 729                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 730
 731                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 732                                           &gfs2_journal_glops,
 733                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 734                                           &sdp->sd_journal_gh);
 735                 if (error) {
 736                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 737                         goto fail_jindex;
 738                 }
 739
 740                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 741                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 742                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 743                                            &sdp->sd_jinode_gh);
 744                 if (error) {
 745                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 746                                error);
 747                         goto fail_journal_gh;
 748                 }
 749
 750                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 751                 if (error) {
 752                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 753                                sdp->sd_jdesc->jd_jid, error);
 754                         goto fail_jinode_gh;
 755                 }
 756                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 757
 758                 /* Map the extents for this journal's blocks */
 759                 map_journal_extents(sdp);
 760         }
 761
 762         if (sdp->sd_lockstruct.ls_first) {
 763                 unsigned int x;
 764                 for (x = 0; x < sdp->sd_journals; x++) {
 765                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 766                         if (error) {
 767                                 fs_err(sdp, "error recovering journal %u: %d\n",
 768                                        x, error);
 769                                 goto fail_jinode_gh;
 770                         }
 771                 }
 772
 773                 gfs2_lm_others_may_mount(sdp);
 774         } else if (!sdp->sd_args.ar_spectator) {
 775                 error = gfs2_recover_journal(sdp->sd_jdesc);
 776                 if (error) {
 777                         fs_err(sdp, "error recovering my journal: %d\n", error);
 778                         goto fail_jinode_gh;
 779                 }
 780         }
 781
 782         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 783         gfs2_glock_dq_uninit(&ji_gh);
 784         jindex = 0;
 785
 786         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 787         error = IS_ERR(p);
 788         if (error) {
 789                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 790                 goto fail_jinode_gh;
 791         }
 792         sdp->sd_recoverd_process = p;
 793
 794         return 0;
 795
 796 fail_recoverd:
 797         kthread_stop(sdp->sd_recoverd_process);
 798 fail_jinode_gh:
 799         if (!sdp->sd_args.ar_spectator)
 800                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 801 fail_journal_gh:
 802         if (!sdp->sd_args.ar_spectator)
 803                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 804 fail_jindex:
 805         gfs2_jindex_free(sdp);
 806         if (jindex)
 807                 gfs2_glock_dq_uninit(&ji_gh);
 808 fail:
 809         iput(sdp->sd_jindex);
 810         return error;
 811 }
 812
 813
 814 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 815 {
 816         int error = 0;
 817         struct gfs2_inode *ip;
 818         struct inode *master = sdp->sd_master_dir->d_inode;
 819
 820         if (undo)
 821                 goto fail_qinode;
 822
 823         error = init_journal(sdp, undo);
 824         if (error)
 825                 goto fail;
 826
 827         /* Read in the master inode number inode */
 828         sdp->sd_inum_inode = gfs2_lookup_simple(master, "inum");
 829         if (IS_ERR(sdp->sd_inum_inode)) {
 830                 error = PTR_ERR(sdp->sd_inum_inode);
 831                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 832                 goto fail_journal;
 833         }
 834
 835
 836         /* Read in the master statfs inode */
 837         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 838         if (IS_ERR(sdp->sd_statfs_inode)) {
 839                 error = PTR_ERR(sdp->sd_statfs_inode);
 840                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 841                 goto fail_inum;
 842         }
 843
 844         /* Read in the resource index inode */
 845         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 846         if (IS_ERR(sdp->sd_rindex)) {
 847                 error = PTR_ERR(sdp->sd_rindex);
 848                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 849                 goto fail_statfs;
 850         }
 851         ip = GFS2_I(sdp->sd_rindex);
 852         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 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_inum:
 872         iput(sdp->sd_inum_inode);
 873 fail_journal:
 874         init_journal(sdp, UNDO);
 875 fail:
 876         return error;
 877 }
 878
 879 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 880 {
 881         struct inode *pn = NULL;
 882         char buf[30];
 883         int error = 0;
 884         struct gfs2_inode *ip;
 885         struct inode *master = sdp->sd_master_dir->d_inode;
 886
 887         if (sdp->sd_args.ar_spectator)
 888                 return 0;
 889
 890         if (undo)
 891                 goto fail_qc_gh;
 892
 893         pn = gfs2_lookup_simple(master, "per_node");
 894         if (IS_ERR(pn)) {
 895                 error = PTR_ERR(pn);
 896                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 897                 return error;
 898         }
 899
 900         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 901         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 902         if (IS_ERR(sdp->sd_ir_inode)) {
 903                 error = PTR_ERR(sdp->sd_ir_inode);
 904                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 905                 goto fail;
 906         }
 907
 908         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 909         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 910         if (IS_ERR(sdp->sd_sc_inode)) {
 911                 error = PTR_ERR(sdp->sd_sc_inode);
 912                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 913                 goto fail_ir_i;
 914         }
 915
 916         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 917         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 918         if (IS_ERR(sdp->sd_qc_inode)) {
 919                 error = PTR_ERR(sdp->sd_qc_inode);
 920                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 921                 goto fail_ut_i;
 922         }
 923
 924         iput(pn);
 925         pn = NULL;
 926
 927         ip = GFS2_I(sdp->sd_ir_inode);
 928         error = gfs2_glock_nq_init(ip->i_gl,
 929                                    LM_ST_EXCLUSIVE, 0,
 930                                    &sdp->sd_ir_gh);
 931         if (error) {
 932                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 933                 goto fail_qc_i;
 934         }
 935
 936         ip = GFS2_I(sdp->sd_sc_inode);
 937         error = gfs2_glock_nq_init(ip->i_gl,
 938                                    LM_ST_EXCLUSIVE, 0,
 939                                    &sdp->sd_sc_gh);
 940         if (error) {
 941                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 942                 goto fail_ir_gh;
 943         }
 944
 945         ip = GFS2_I(sdp->sd_qc_inode);
 946         error = gfs2_glock_nq_init(ip->i_gl,
 947                                    LM_ST_EXCLUSIVE, 0,
 948                                    &sdp->sd_qc_gh);
 949         if (error) {
 950                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 951                 goto fail_ut_gh;
 952         }
 953
 954         return 0;
 955
 956 fail_qc_gh:
 957         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 958 fail_ut_gh:
 959         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 960 fail_ir_gh:
 961         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 962 fail_qc_i:
 963         iput(sdp->sd_qc_inode);
 964 fail_ut_i:
 965         iput(sdp->sd_sc_inode);
 966 fail_ir_i:
 967         iput(sdp->sd_ir_inode);
 968 fail:
 969         if (pn)
 970                 iput(pn);
 971         return error;
 972 }
 973
 974 static int init_threads(struct gfs2_sbd *sdp, int undo)
 975 {
 976         struct task_struct *p;
 977         int error = 0;
 978
 979         if (undo)
 980                 goto fail_quotad;
 981
 982         sdp->sd_log_flush_time = jiffies;
 983         sdp->sd_jindex_refresh_time = jiffies;
 984
 985         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 986         error = IS_ERR(p);
 987         if (error) {
 988                 fs_err(sdp, "can't start logd thread: %d\n", error);
 989                 return error;
 990         }
 991         sdp->sd_logd_process = p;
 992
 993         sdp->sd_statfs_sync_time = jiffies;
 994         sdp->sd_quota_sync_time = jiffies;
 995
 996         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 997         error = IS_ERR(p);
 998         if (error) {
 999                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1000                 goto fail;
1001         }
1002         sdp->sd_quotad_process = p;
1003
1004         return 0;
1005
1006
1007 fail_quotad:
1008         kthread_stop(sdp->sd_quotad_process);
1009 fail:
1010         kthread_stop(sdp->sd_logd_process);
1011         return error;
1012 }
1013
1014 /**
1015  * gfs2_lm_mount - mount a locking protocol
1016  * @sdp: the filesystem
1017  * @args: mount arguements
1018  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1019  *
1020  * Returns: errno
1021  */
1022
1023 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1024 {
1025         char *proto = sdp->sd_proto_name;
1026         char *table = sdp->sd_table_name;
1027         int flags = LM_MFLAG_CONV_NODROP;
1028         int error;
1029
1030         if (sdp->sd_args.ar_spectator)
1031                 flags |= LM_MFLAG_SPECTATOR;
1032
1033         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1034
1035         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
1036                                      gfs2_glock_cb, sdp,
1037                                      GFS2_MIN_LVB_SIZE, flags,
1038                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
1039         if (error) {
1040                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
1041                         proto, table, sdp->sd_args.ar_hostdata);
1042                 goto out;
1043         }
1044
1045         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
1046             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
1047                                   GFS2_MIN_LVB_SIZE)) {
1048                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1049                 goto out;
1050         }
1051
1052         if (sdp->sd_args.ar_spectator)
1053                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1054         else
1055                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1056                          sdp->sd_lockstruct.ls_jid);
1057
1058         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1059
1060         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
1061             !sdp->sd_args.ar_ignore_local_fs) {
1062                 sdp->sd_args.ar_localflocks = 1;
1063                 sdp->sd_args.ar_localcaching = 1;
1064         }
1065
1066 out:
1067         return error;
1068 }
1069
1070 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1071 {
1072         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
1073                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
1074 }
1075
1076 /**
1077  * fill_super - Read in superblock
1078  * @sb: The VFS superblock
1079  * @data: Mount options
1080  * @silent: Don't complain if it's not a GFS2 filesystem
1081  *
1082  * Returns: errno
1083  */
1084
1085 static int fill_super(struct super_block *sb, void *data, int silent)
1086 {
1087         struct gfs2_sbd *sdp;
1088         struct gfs2_holder mount_gh;
1089         int error;
1090
1091         sdp = init_sbd(sb);
1092         if (!sdp) {
1093                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1094                 return -ENOMEM;
1095         }
1096
1097         error = gfs2_mount_args(sdp, (char *)data, 0);
1098         if (error) {
1099                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1100                 goto fail;
1101         }
1102
1103         init_vfs(sb, SDF_NOATIME);
1104
1105         /* Set up the buffer cache and fill in some fake block size values
1106            to allow us to read-in the on-disk superblock. */
1107         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1108         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1109         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1110                                GFS2_BASIC_BLOCK_SHIFT;
1111         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1112
1113         error = init_names(sdp, silent);
1114         if (error)
1115                 goto fail;
1116
1117         gfs2_create_debugfs_file(sdp);
1118
1119         error = gfs2_sys_fs_add(sdp);
1120         if (error)
1121                 goto fail;
1122
1123         error = gfs2_lm_mount(sdp, silent);
1124         if (error)
1125                 goto fail_sys;
1126
1127         error = init_locking(sdp, &mount_gh, DO);
1128         if (error)
1129                 goto fail_lm;
1130
1131         error = init_sb(sdp, silent);
1132         if (error)
1133                 goto fail_locking;
1134
1135         error = init_inodes(sdp, DO);
1136         if (error)
1137                 goto fail_sb;
1138
1139         error = init_per_node(sdp, DO);
1140         if (error)
1141                 goto fail_inodes;
1142
1143         error = gfs2_statfs_init(sdp);
1144         if (error) {
1145                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1146                 goto fail_per_node;
1147         }
1148
1149         error = init_threads(sdp, DO);
1150         if (error)
1151                 goto fail_per_node;
1152
1153         if (!(sb->s_flags & MS_RDONLY)) {
1154                 error = gfs2_make_fs_rw(sdp);
1155                 if (error) {
1156                         fs_err(sdp, "can't make FS RW: %d\n", error);
1157                         goto fail_threads;
1158                 }
1159         }
1160
1161         gfs2_glock_dq_uninit(&mount_gh);
1162
1163         return 0;
1164
1165 fail_threads:
1166         init_threads(sdp, UNDO);
1167 fail_per_node:
1168         init_per_node(sdp, UNDO);
1169 fail_inodes:
1170         init_inodes(sdp, UNDO);
1171 fail_sb:
1172         if (sdp->sd_root_dir)
1173                 dput(sdp->sd_root_dir);
1174         if (sdp->sd_master_dir)
1175                 dput(sdp->sd_master_dir);
1176         sb->s_root = NULL;
1177 fail_locking:
1178         init_locking(sdp, &mount_gh, UNDO);
1179 fail_lm:
1180         gfs2_gl_hash_clear(sdp);
1181         gfs2_lm_unmount(sdp);
1182         while (invalidate_inodes(sb))
1183                 yield();
1184 fail_sys:
1185         gfs2_sys_fs_del(sdp);
1186 fail:
1187         gfs2_delete_debugfs_file(sdp);
1188         kfree(sdp);
1189         sb->s_fs_info = NULL;
1190         return error;
1191 }
1192
1193 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1194                        const char *dev_name, void *data, struct vfsmount *mnt)
1195 {
1196         return get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
1197 }
1198
1199 static struct super_block *get_gfs2_sb(const char *dev_name)
1200 {
1201         struct super_block *sb;
1202         struct nameidata nd;
1203         int error;
1204
1205         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
1206         if (error) {
1207                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1208                        dev_name, error);
1209                 return NULL;
1210         }
1211         sb = nd.path.dentry->d_inode->i_sb;
1212         if (sb && (sb->s_type == &gfs2_fs_type))
1213                 atomic_inc(&sb->s_active);
1214         else
1215                 sb = NULL;
1216         path_put(&nd.path);
1217         return sb;
1218 }
1219
1220 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1221                             const char *dev_name, void *data, struct vfsmount *mnt)
1222 {
1223         struct super_block *sb = NULL;
1224         struct gfs2_sbd *sdp;
1225
1226         sb = get_gfs2_sb(dev_name);
1227         if (!sb) {
1228                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1229                 return -ENOENT;
1230         }
1231         sdp = sb->s_fs_info;
1232         mnt->mnt_sb = sb;
1233         mnt->mnt_root = dget(sdp->sd_master_dir);
1234         return 0;
1235 }
1236
1237 static void gfs2_kill_sb(struct super_block *sb)
1238 {
1239         struct gfs2_sbd *sdp = sb->s_fs_info;
1240         gfs2_meta_syncfs(sdp);
1241         dput(sdp->sd_root_dir);
1242         dput(sdp->sd_master_dir);
1243         sdp->sd_root_dir = NULL;
1244         sdp->sd_master_dir = NULL;
1245         shrink_dcache_sb(sb);
1246         kill_block_super(sb);
1247         gfs2_delete_debugfs_file(sdp);
1248 }
1249
1250 struct file_system_type gfs2_fs_type = {
1251         .name = "gfs2",
1252         .fs_flags = FS_REQUIRES_DEV,
1253         .get_sb = gfs2_get_sb,
1254         .kill_sb = gfs2_kill_sb,
1255         .owner = THIS_MODULE,
1256 };
1257
1258 struct file_system_type gfs2meta_fs_type = {
1259         .name = "gfs2meta",
1260         .fs_flags = FS_REQUIRES_DEV,
1261         .get_sb = gfs2_get_sb_meta,
1262         .owner = THIS_MODULE,
1263 };
1264