Pileus Git - ~andy/linux/blob - fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/export.h>
  18 #include <linux/namei.h>
  19 #include <linux/mount.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/quotaops.h>
  22 #include <linux/lockdep.h>
  23 #include <linux/module.h>
  24
  25 #include "gfs2.h"
  26 #include "incore.h"
  27 #include "bmap.h"
  28 #include "glock.h"
  29 #include "glops.h"
  30 #include "inode.h"
  31 #include "recovery.h"
  32 #include "rgrp.h"
  33 #include "super.h"
  34 #include "sys.h"
  35 #include "util.h"
  36 #include "log.h"
  37 #include "quota.h"
  38 #include "dir.h"
  39 #include "meta_io.h"
  40 #include "trace_gfs2.h"
  41
  42 #define DO 0
  43 #define UNDO 1
  44
  45 /**
  46  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  47  * @gt: tune
  48  *
  49  */
  50
  51 static void gfs2_tune_init(struct gfs2_tune *gt)
  52 {
  53         spin_lock_init(&gt->gt_spin);
  54
  55         gt->gt_quota_warn_period = 10;
  56         gt->gt_quota_scale_num = 1;
  57         gt->gt_quota_scale_den = 1;
  58         gt->gt_new_files_jdata = 0;
  59         gt->gt_max_readahead = 1 << 18;
  60         gt->gt_complain_secs = 10;
  61 }
  62
  63 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  64 {
  65         struct gfs2_sbd *sdp;
  66         struct address_space *mapping;
  67
  68         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  69         if (!sdp)
  70                 return NULL;
  71
  72         sb->s_fs_info = sdp;
  73         sdp->sd_vfs = sb;
  74         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
  75         if (!sdp->sd_lkstats) {
  76                 kfree(sdp);
  77                 return NULL;
  78         }
  79
  80         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  81         gfs2_tune_init(&sdp->sd_tune);
  82
  83         init_waitqueue_head(&sdp->sd_glock_wait);
  84         atomic_set(&sdp->sd_glock_disposal, 0);
  85         init_completion(&sdp->sd_locking_init);
  86         init_completion(&sdp->sd_wdack);
  87         spin_lock_init(&sdp->sd_statfs_spin);
  88
  89         spin_lock_init(&sdp->sd_rindex_spin);
  90         sdp->sd_rindex_tree.rb_node = NULL;
  91
  92         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  93         spin_lock_init(&sdp->sd_jindex_spin);
  94         mutex_init(&sdp->sd_jindex_mutex);
  95
  96         INIT_LIST_HEAD(&sdp->sd_quota_list);
  97         mutex_init(&sdp->sd_quota_mutex);
  98         mutex_init(&sdp->sd_quota_sync_mutex);
  99         init_waitqueue_head(&sdp->sd_quota_wait);
 100         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 101         spin_lock_init(&sdp->sd_trunc_lock);
 102         spin_lock_init(&sdp->sd_bitmap_lock);
 103
 104         mapping = &sdp->sd_aspace;
 105
 106         address_space_init_once(mapping);
 107         mapping->a_ops = &gfs2_meta_aops;
 108         mapping->host = sb->s_bdev->bd_inode;
 109         mapping->flags = 0;
 110         mapping_set_gfp_mask(mapping, GFP_NOFS);
 111         mapping->private_data = NULL;
 112         mapping->backing_dev_info = sb->s_bdi;
 113         mapping->writeback_index = 0;
 114
 115         spin_lock_init(&sdp->sd_log_lock);
 116         atomic_set(&sdp->sd_log_pinned, 0);
 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_databuf);
 120         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 121         spin_lock_init(&sdp->sd_ordered_lock);
 122
 123         init_waitqueue_head(&sdp->sd_log_waitq);
 124         init_waitqueue_head(&sdp->sd_logd_waitq);
 125         spin_lock_init(&sdp->sd_ail_lock);
 126         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 127         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 128
 129         init_rwsem(&sdp->sd_log_flush_lock);
 130         atomic_set(&sdp->sd_log_in_flight, 0);
 131         init_waitqueue_head(&sdp->sd_log_flush_wait);
 132
 133         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 134
 135         return sdp;
 136 }
 137
 138
 139 /**
 140  * gfs2_check_sb - Check superblock
 141  * @sdp: the filesystem
 142  * @sb: The superblock
 143  * @silent: Don't print a message if the check fails
 144  *
 145  * Checks the version code of the FS is one that we understand how to
 146  * read and that the sizes of the various on-disk structures have not
 147  * changed.
 148  */
 149
 150 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 151 {
 152         struct gfs2_sb_host *sb = &sdp->sd_sb;
 153
 154         if (sb->sb_magic != GFS2_MAGIC ||
 155             sb->sb_type != GFS2_METATYPE_SB) {
 156                 if (!silent)
 157                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 158                 return -EINVAL;
 159         }
 160
 161         /*  If format numbers match exactly, we're done.  */
 162
 163         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 164             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 165                 return 0;
 166
 167         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 168
 169         return -EINVAL;
 170 }
 171
 172 static void end_bio_io_page(struct bio *bio, int error)
 173 {
 174         struct page *page = bio->bi_private;
 175
 176         if (!error)
 177                 SetPageUptodate(page);
 178         else
 179                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 180         unlock_page(page);
 181 }
 182
 183 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 184 {
 185         struct gfs2_sb_host *sb = &sdp->sd_sb;
 186         struct super_block *s = sdp->sd_vfs;
 187         const struct gfs2_sb *str = buf;
 188
 189         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 190         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 191         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 192         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 193         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 194         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 195         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 196         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 197         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 198         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 199         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 200
 201         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 202         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 203         memcpy(s->s_uuid, str->sb_uuid, 16);
 204 }
 205
 206 /**
 207  * gfs2_read_super - Read the gfs2 super block from disk
 208  * @sdp: The GFS2 super block
 209  * @sector: The location of the super block
 210  * @error: The error code to return
 211  *
 212  * This uses the bio functions to read the super block from disk
 213  * because we want to be 100% sure that we never read cached data.
 214  * A super block is read twice only during each GFS2 mount and is
 215  * never written to by the filesystem. The first time its read no
 216  * locks are held, and the only details which are looked at are those
 217  * relating to the locking protocol. Once locking is up and working,
 218  * the sb is read again under the lock to establish the location of
 219  * the master directory (contains pointers to journals etc) and the
 220  * root directory.
 221  *
 222  * Returns: 0 on success or error
 223  */
 224
 225 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 226 {
 227         struct super_block *sb = sdp->sd_vfs;
 228         struct gfs2_sb *p;
 229         struct page *page;
 230         struct bio *bio;
 231
 232         page = alloc_page(GFP_NOFS);
 233         if (unlikely(!page))
 234                 return -ENOMEM;
 235
 236         ClearPageUptodate(page);
 237         ClearPageDirty(page);
 238         lock_page(page);
 239
 240         bio = bio_alloc(GFP_NOFS, 1);
 241         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
 242         bio->bi_bdev = sb->s_bdev;
 243         bio_add_page(bio, page, PAGE_SIZE, 0);
 244
 245         bio->bi_end_io = end_bio_io_page;
 246         bio->bi_private = page;
 247         submit_bio(READ_SYNC | REQ_META, bio);
 248         wait_on_page_locked(page);
 249         bio_put(bio);
 250         if (!PageUptodate(page)) {
 251                 __free_page(page);
 252                 return -EIO;
 253         }
 254         p = kmap(page);
 255         gfs2_sb_in(sdp, p);
 256         kunmap(page);
 257         __free_page(page);
 258         return gfs2_check_sb(sdp, silent);
 259 }
 260
 261 /**
 262  * gfs2_read_sb - Read super block
 263  * @sdp: The GFS2 superblock
 264  * @silent: Don't print message if mount fails
 265  *
 266  */
 267
 268 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 269 {
 270         u32 hash_blocks, ind_blocks, leaf_blocks;
 271         u32 tmp_blocks;
 272         unsigned int x;
 273         int error;
 274
 275         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 276         if (error) {
 277                 if (!silent)
 278                         fs_err(sdp, "can't read superblock\n");
 279                 return error;
 280         }
 281
 282         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 283                                GFS2_BASIC_BLOCK_SHIFT;
 284         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 285         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 286                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 287         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 288                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 289         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 290         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 291         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 292         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 293         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 294                                 sizeof(struct gfs2_meta_header)) /
 295                                 sizeof(struct gfs2_quota_change);
 296         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
 297                                      sizeof(struct gfs2_meta_header))
 298                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
 299
 300         /* Compute maximum reservation required to add a entry to a directory */
 301
 302         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 303                              sdp->sd_jbsize);
 304
 305         ind_blocks = 0;
 306         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 307                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 308                 ind_blocks += tmp_blocks;
 309         }
 310
 311         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 312
 313         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 314
 315         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 316                                 sizeof(struct gfs2_dinode);
 317         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 318         for (x = 2;; x++) {
 319                 u64 space, d;
 320                 u32 m;
 321
 322                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 323                 d = space;
 324                 m = do_div(d, sdp->sd_inptrs);
 325
 326                 if (d != sdp->sd_heightsize[x - 1] || m)
 327                         break;
 328                 sdp->sd_heightsize[x] = space;
 329         }
 330         sdp->sd_max_height = x;
 331         sdp->sd_heightsize[x] = ~0;
 332         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 333
 334         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 335                                  sizeof(struct gfs2_dinode);
 336         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 337         for (x = 2;; x++) {
 338                 u64 space, d;
 339                 u32 m;
 340
 341                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 342                 d = space;
 343                 m = do_div(d, sdp->sd_inptrs);
 344
 345                 if (d != sdp->sd_jheightsize[x - 1] || m)
 346                         break;
 347                 sdp->sd_jheightsize[x] = space;
 348         }
 349         sdp->sd_max_jheight = x;
 350         sdp->sd_jheightsize[x] = ~0;
 351         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 352
 353         return 0;
 354 }
 355
 356 static int init_names(struct gfs2_sbd *sdp, int silent)
 357 {
 358         char *proto, *table;
 359         int error = 0;
 360
 361         proto = sdp->sd_args.ar_lockproto;
 362         table = sdp->sd_args.ar_locktable;
 363
 364         /*  Try to autodetect  */
 365
 366         if (!proto[0] || !table[0]) {
 367                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 368                 if (error)
 369                         return error;
 370
 371                 if (!proto[0])
 372                         proto = sdp->sd_sb.sb_lockproto;
 373                 if (!table[0])
 374                         table = sdp->sd_sb.sb_locktable;
 375         }
 376
 377         if (!table[0])
 378                 table = sdp->sd_vfs->s_id;
 379
 380         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 381         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 382
 383         table = sdp->sd_table_name;
 384         while ((table = strchr(table, '/')))
 385                 *table = '_';
 386
 387         return error;
 388 }
 389
 390 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 391                         int undo)
 392 {
 393         int error = 0;
 394
 395         if (undo)
 396                 goto fail_trans;
 397
 398         error = gfs2_glock_nq_num(sdp,
 399                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 400                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 401                                   mount_gh);
 402         if (error) {
 403                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 404                 goto fail;
 405         }
 406
 407         error = gfs2_glock_nq_num(sdp,
 408                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 409                                   LM_ST_SHARED,
 410                                   LM_FLAG_NOEXP | GL_EXACT,
 411                                   &sdp->sd_live_gh);
 412         if (error) {
 413                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 414                 goto fail_mount;
 415         }
 416
 417         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 418                                CREATE, &sdp->sd_rename_gl);
 419         if (error) {
 420                 fs_err(sdp, "can't create rename glock: %d\n", error);
 421                 goto fail_live;
 422         }
 423
 424         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 425                                CREATE, &sdp->sd_trans_gl);
 426         if (error) {
 427                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 428                 goto fail_rename;
 429         }
 430
 431         return 0;
 432
 433 fail_trans:
 434         gfs2_glock_put(sdp->sd_trans_gl);
 435 fail_rename:
 436         gfs2_glock_put(sdp->sd_rename_gl);
 437 fail_live:
 438         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 439 fail_mount:
 440         gfs2_glock_dq_uninit(mount_gh);
 441 fail:
 442         return error;
 443 }
 444
 445 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 446                             u64 no_addr, const char *name)
 447 {
 448         struct gfs2_sbd *sdp = sb->s_fs_info;
 449         struct dentry *dentry;
 450         struct inode *inode;
 451
 452         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 453         if (IS_ERR(inode)) {
 454                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 455                 return PTR_ERR(inode);
 456         }
 457         dentry = d_make_root(inode);
 458         if (!dentry) {
 459                 fs_err(sdp, "can't alloc %s dentry\n", name);
 460                 return -ENOMEM;
 461         }
 462         *dptr = dentry;
 463         return 0;
 464 }
 465
 466 static int init_sb(struct gfs2_sbd *sdp, int silent)
 467 {
 468         struct super_block *sb = sdp->sd_vfs;
 469         struct gfs2_holder sb_gh;
 470         u64 no_addr;
 471         int ret;
 472
 473         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 474                                 LM_ST_SHARED, 0, &sb_gh);
 475         if (ret) {
 476                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 477                 return ret;
 478         }
 479
 480         ret = gfs2_read_sb(sdp, silent);
 481         if (ret) {
 482                 fs_err(sdp, "can't read superblock: %d\n", ret);
 483                 goto out;
 484         }
 485
 486         /* Set up the buffer cache and SB for real */
 487         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 488                 ret = -EINVAL;
 489                 fs_err(sdp, "FS block size (%u) is too small for device "
 490                        "block size (%u)\n",
 491                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 492                 goto out;
 493         }
 494         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 495                 ret = -EINVAL;
 496                 fs_err(sdp, "FS block size (%u) is too big for machine "
 497                        "page size (%u)\n",
 498                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 499                 goto out;
 500         }
 501         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 502
 503         /* Get the root inode */
 504         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 505         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 506         if (ret)
 507                 goto out;
 508
 509         /* Get the master inode */
 510         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 511         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 512         if (ret) {
 513                 dput(sdp->sd_root_dir);
 514                 goto out;
 515         }
 516         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 517 out:
 518         gfs2_glock_dq_uninit(&sb_gh);
 519         return ret;
 520 }
 521
 522 /**
 523  * map_journal_extents - create a reusable "extent" mapping from all logical
 524  * blocks to all physical blocks for the given journal.  This will save
 525  * us time when writing journal blocks.  Most journals will have only one
 526  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 527  * arranges the journal blocks sequentially to maximize performance.
 528  * So the extent would map the first block for the entire file length.
 529  * However, gfs2_jadd can happen while file activity is happening, so
 530  * those journals may not be sequential.  Less likely is the case where
 531  * the users created their own journals by mounting the metafs and
 532  * laying it out.  But it's still possible.  These journals might have
 533  * several extents.
 534  *
 535  * TODO: This should be done in bigger chunks rather than one block at a time,
 536  *       but since it's only done at mount time, I'm not worried about the
 537  *       time it takes.
 538  */
 539 static int map_journal_extents(struct gfs2_sbd *sdp)
 540 {
 541         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 542         unsigned int lb;
 543         u64 db, prev_db; /* logical block, disk block, prev disk block */
 544         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 545         struct gfs2_journal_extent *jext = NULL;
 546         struct buffer_head bh;
 547         int rc = 0;
 548
 549         prev_db = 0;
 550
 551         for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
 552                 bh.b_state = 0;
 553                 bh.b_blocknr = 0;
 554                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 555                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 556                 db = bh.b_blocknr;
 557                 if (rc || !db) {
 558                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 559                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 560                         break;
 561                 }
 562                 if (!prev_db || db != prev_db + 1) {
 563                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 564                                        GFP_KERNEL);
 565                         if (!jext) {
 566                                 printk(KERN_INFO "GFS2 error: out of memory "
 567                                        "mapping journal extents.\n");
 568                                 rc = -ENOMEM;
 569                                 break;
 570                         }
 571                         jext->dblock = db;
 572                         jext->lblock = lb;
 573                         jext->blocks = 1;
 574                         list_add_tail(&jext->extent_list, &jd->extent_list);
 575                 } else {
 576                         jext->blocks++;
 577                 }
 578                 prev_db = db;
 579         }
 580         return rc;
 581 }
 582
 583 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 584 {
 585         char *message = "FIRSTMOUNT=Done";
 586         char *envp[] = { message, NULL };
 587
 588         fs_info(sdp, "first mount done, others may mount\n");
 589
 590         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 591                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 592
 593         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 594 }
 595
 596 /**
 597  * gfs2_jindex_hold - Grab a lock on the jindex
 598  * @sdp: The GFS2 superblock
 599  * @ji_gh: the holder for the jindex glock
 600  *
 601  * Returns: errno
 602  */
 603
 604 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 605 {
 606         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 607         struct qstr name;
 608         char buf[20];
 609         struct gfs2_jdesc *jd;
 610         int error;
 611
 612         name.name = buf;
 613
 614         mutex_lock(&sdp->sd_jindex_mutex);
 615
 616         for (;;) {
 617                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 618                 if (error)
 619                         break;
 620
 621                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 622                 name.hash = gfs2_disk_hash(name.name, name.len);
 623
 624                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 625                 if (error == -ENOENT) {
 626                         error = 0;
 627                         break;
 628                 }
 629
 630                 gfs2_glock_dq_uninit(ji_gh);
 631
 632                 if (error)
 633                         break;
 634
 635                 error = -ENOMEM;
 636                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 637                 if (!jd)
 638                         break;
 639
 640                 INIT_LIST_HEAD(&jd->extent_list);
 641                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 642                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 643                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 644                         if (!jd->jd_inode)
 645                                 error = -ENOENT;
 646                         else
 647                                 error = PTR_ERR(jd->jd_inode);
 648                         kfree(jd);
 649                         break;
 650                 }
 651
 652                 spin_lock(&sdp->sd_jindex_spin);
 653                 jd->jd_jid = sdp->sd_journals++;
 654                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 655                 spin_unlock(&sdp->sd_jindex_spin);
 656         }
 657
 658         mutex_unlock(&sdp->sd_jindex_mutex);
 659
 660         return error;
 661 }
 662
 663 /**
 664  * check_journal_clean - Make sure a journal is clean for a spectator mount
 665  * @sdp: The GFS2 superblock
 666  * @jd: The journal descriptor
 667  *
 668  * Returns: 0 if the journal is clean or locked, else an error
 669  */
 670 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
 671 {
 672         int error;
 673         struct gfs2_holder j_gh;
 674         struct gfs2_log_header_host head;
 675         struct gfs2_inode *ip;
 676
 677         ip = GFS2_I(jd->jd_inode);
 678         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
 679                                    GL_EXACT | GL_NOCACHE, &j_gh);
 680         if (error) {
 681                 fs_err(sdp, "Error locking journal for spectator mount.\n");
 682                 return -EPERM;
 683         }
 684         error = gfs2_jdesc_check(jd);
 685         if (error) {
 686                 fs_err(sdp, "Error checking journal for spectator mount.\n");
 687                 goto out_unlock;
 688         }
 689         error = gfs2_find_jhead(jd, &head);
 690         if (error) {
 691                 fs_err(sdp, "Error parsing journal for spectator mount.\n");
 692                 goto out_unlock;
 693         }
 694         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
 695                 error = -EPERM;
 696                 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
 697                        "must not be a spectator.\n", jd->jd_jid);
 698         }
 699
 700 out_unlock:
 701         gfs2_glock_dq_uninit(&j_gh);
 702         return error;
 703 }
 704
 705 static int init_journal(struct gfs2_sbd *sdp, int undo)
 706 {
 707         struct inode *master = sdp->sd_master_dir->d_inode;
 708         struct gfs2_holder ji_gh;
 709         struct gfs2_inode *ip;
 710         int jindex = 1;
 711         int error = 0;
 712
 713         if (undo) {
 714                 jindex = 0;
 715                 goto fail_jinode_gh;
 716         }
 717
 718         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 719         if (IS_ERR(sdp->sd_jindex)) {
 720                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 721                 return PTR_ERR(sdp->sd_jindex);
 722         }
 723
 724         /* Load in the journal index special file */
 725
 726         error = gfs2_jindex_hold(sdp, &ji_gh);
 727         if (error) {
 728                 fs_err(sdp, "can't read journal index: %d\n", error);
 729                 goto fail;
 730         }
 731
 732         error = -EUSERS;
 733         if (!gfs2_jindex_size(sdp)) {
 734                 fs_err(sdp, "no journals!\n");
 735                 goto fail_jindex;
 736         }
 737
 738         if (sdp->sd_args.ar_spectator) {
 739                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 740                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 741                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 742                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 743         } else {
 744                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 745                         fs_err(sdp, "can't mount journal #%u\n",
 746                                sdp->sd_lockstruct.ls_jid);
 747                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 748                                gfs2_jindex_size(sdp),
 749                                gfs2_jindex_size(sdp) - 1);
 750                         goto fail_jindex;
 751                 }
 752                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 753
 754                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 755                                           &gfs2_journal_glops,
 756                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 757                                           &sdp->sd_journal_gh);
 758                 if (error) {
 759                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 760                         goto fail_jindex;
 761                 }
 762
 763                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 764                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 765                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 766                                            &sdp->sd_jinode_gh);
 767                 if (error) {
 768                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 769                                error);
 770                         goto fail_journal_gh;
 771                 }
 772
 773                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 774                 if (error) {
 775                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 776                                sdp->sd_jdesc->jd_jid, error);
 777                         goto fail_jinode_gh;
 778                 }
 779                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 780                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 781                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 782
 783                 /* Map the extents for this journal's blocks */
 784                 map_journal_extents(sdp);
 785         }
 786         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 787
 788         if (sdp->sd_lockstruct.ls_first) {
 789                 unsigned int x;
 790                 for (x = 0; x < sdp->sd_journals; x++) {
 791                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
 792
 793                         if (sdp->sd_args.ar_spectator) {
 794                                 error = check_journal_clean(sdp, jd);
 795                                 if (error)
 796                                         goto fail_jinode_gh;
 797                                 continue;
 798                         }
 799                         error = gfs2_recover_journal(jd, true);
 800                         if (error) {
 801                                 fs_err(sdp, "error recovering journal %u: %d\n",
 802                                        x, error);
 803                                 goto fail_jinode_gh;
 804                         }
 805                 }
 806
 807                 gfs2_others_may_mount(sdp);
 808         } else if (!sdp->sd_args.ar_spectator) {
 809                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 810                 if (error) {
 811                         fs_err(sdp, "error recovering my journal: %d\n", error);
 812                         goto fail_jinode_gh;
 813                 }
 814         }
 815
 816         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 817         gfs2_glock_dq_uninit(&ji_gh);
 818         jindex = 0;
 819
 820         return 0;
 821
 822 fail_jinode_gh:
 823         if (!sdp->sd_args.ar_spectator)
 824                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 825 fail_journal_gh:
 826         if (!sdp->sd_args.ar_spectator)
 827                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 828 fail_jindex:
 829         gfs2_jindex_free(sdp);
 830         if (jindex)
 831                 gfs2_glock_dq_uninit(&ji_gh);
 832 fail:
 833         iput(sdp->sd_jindex);
 834         return error;
 835 }
 836
 837 static struct lock_class_key gfs2_quota_imutex_key;
 838
 839 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 840 {
 841         int error = 0;
 842         struct inode *master = sdp->sd_master_dir->d_inode;
 843
 844         if (undo)
 845                 goto fail_qinode;
 846
 847         error = init_journal(sdp, undo);
 848         if (error)
 849                 goto fail;
 850
 851         /* Read in the master statfs inode */
 852         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 853         if (IS_ERR(sdp->sd_statfs_inode)) {
 854                 error = PTR_ERR(sdp->sd_statfs_inode);
 855                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 856                 goto fail_journal;
 857         }
 858
 859         /* Read in the resource index inode */
 860         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 861         if (IS_ERR(sdp->sd_rindex)) {
 862                 error = PTR_ERR(sdp->sd_rindex);
 863                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 864                 goto fail_statfs;
 865         }
 866         sdp->sd_rindex_uptodate = 0;
 867
 868         /* Read in the quota inode */
 869         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 870         if (IS_ERR(sdp->sd_quota_inode)) {
 871                 error = PTR_ERR(sdp->sd_quota_inode);
 872                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 873                 goto fail_rindex;
 874         }
 875         /*
 876          * i_mutex on quota files is special. Since this inode is hidden system
 877          * file, we are safe to define locking ourselves.
 878          */
 879         lockdep_set_class(&sdp->sd_quota_inode->i_mutex,
 880                           &gfs2_quota_imutex_key);
 881
 882         error = gfs2_rindex_update(sdp);
 883         if (error)
 884                 goto fail_qinode;
 885
 886         return 0;
 887
 888 fail_qinode:
 889         iput(sdp->sd_quota_inode);
 890 fail_rindex:
 891         gfs2_clear_rgrpd(sdp);
 892         iput(sdp->sd_rindex);
 893 fail_statfs:
 894         iput(sdp->sd_statfs_inode);
 895 fail_journal:
 896         init_journal(sdp, UNDO);
 897 fail:
 898         return error;
 899 }
 900
 901 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 902 {
 903         struct inode *pn = NULL;
 904         char buf[30];
 905         int error = 0;
 906         struct gfs2_inode *ip;
 907         struct inode *master = sdp->sd_master_dir->d_inode;
 908
 909         if (sdp->sd_args.ar_spectator)
 910                 return 0;
 911
 912         if (undo)
 913                 goto fail_qc_gh;
 914
 915         pn = gfs2_lookup_simple(master, "per_node");
 916         if (IS_ERR(pn)) {
 917                 error = PTR_ERR(pn);
 918                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 919                 return error;
 920         }
 921
 922         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 923         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 924         if (IS_ERR(sdp->sd_sc_inode)) {
 925                 error = PTR_ERR(sdp->sd_sc_inode);
 926                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 927                 goto fail;
 928         }
 929
 930         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 931         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 932         if (IS_ERR(sdp->sd_qc_inode)) {
 933                 error = PTR_ERR(sdp->sd_qc_inode);
 934                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 935                 goto fail_ut_i;
 936         }
 937
 938         iput(pn);
 939         pn = NULL;
 940
 941         ip = GFS2_I(sdp->sd_sc_inode);
 942         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 943                                    &sdp->sd_sc_gh);
 944         if (error) {
 945                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 946                 goto fail_qc_i;
 947         }
 948
 949         ip = GFS2_I(sdp->sd_qc_inode);
 950         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 951                                    &sdp->sd_qc_gh);
 952         if (error) {
 953                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 954                 goto fail_ut_gh;
 955         }
 956
 957         return 0;
 958
 959 fail_qc_gh:
 960         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 961 fail_ut_gh:
 962         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 963 fail_qc_i:
 964         iput(sdp->sd_qc_inode);
 965 fail_ut_i:
 966         iput(sdp->sd_sc_inode);
 967 fail:
 968         if (pn)
 969                 iput(pn);
 970         return error;
 971 }
 972
 973 static const match_table_t nolock_tokens = {
 974         { Opt_jid, "jid=%d\n", },
 975         { Opt_err, NULL },
 976 };
 977
 978 static const struct lm_lockops nolock_ops = {
 979         .lm_proto_name = "lock_nolock",
 980         .lm_put_lock = gfs2_glock_free,
 981         .lm_tokens = &nolock_tokens,
 982 };
 983
 984 /**
 985  * gfs2_lm_mount - mount a locking protocol
 986  * @sdp: the filesystem
 987  * @args: mount arguments
 988  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 989  *
 990  * Returns: errno
 991  */
 992
 993 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 994 {
 995         const struct lm_lockops *lm;
 996         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 997         struct gfs2_args *args = &sdp->sd_args;
 998         const char *proto = sdp->sd_proto_name;
 999         const char *table = sdp->sd_table_name;
1000         char *o, *options;
1001         int ret;
1002
1003         if (!strcmp("lock_nolock", proto)) {
1004                 lm = &nolock_ops;
1005                 sdp->sd_args.ar_localflocks = 1;
1006 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1007         } else if (!strcmp("lock_dlm", proto)) {
1008                 lm = &gfs2_dlm_ops;
1009 #endif
1010         } else {
1011                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1012                 return -ENOENT;
1013         }
1014
1015         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1016
1017         ls->ls_ops = lm;
1018         ls->ls_first = 1;
1019
1020         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1021                 substring_t tmp[MAX_OPT_ARGS];
1022                 int token, option;
1023
1024                 if (!o || !*o)
1025                         continue;
1026
1027                 token = match_token(o, *lm->lm_tokens, tmp);
1028                 switch (token) {
1029                 case Opt_jid:
1030                         ret = match_int(&tmp[0], &option);
1031                         if (ret || option < 0)
1032                                 goto hostdata_error;
1033                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1034                                 ls->ls_jid = option;
1035                         break;
1036                 case Opt_id:
1037                 case Opt_nodir:
1038                         /* Obsolete, but left for backward compat purposes */
1039                         break;
1040                 case Opt_first:
1041                         ret = match_int(&tmp[0], &option);
1042                         if (ret || (option != 0 && option != 1))
1043                                 goto hostdata_error;
1044                         ls->ls_first = option;
1045                         break;
1046                 case Opt_err:
1047                 default:
1048 hostdata_error:
1049                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1050                         return -EINVAL;
1051                 }
1052         }
1053
1054         if (lm->lm_mount == NULL) {
1055                 fs_info(sdp, "Now mounting FS...\n");
1056                 complete_all(&sdp->sd_locking_init);
1057                 return 0;
1058         }
1059         ret = lm->lm_mount(sdp, table);
1060         if (ret == 0)
1061                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1062         complete_all(&sdp->sd_locking_init);
1063         return ret;
1064 }
1065
1066 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1067 {
1068         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1069         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1070             lm->lm_unmount)
1071                 lm->lm_unmount(sdp);
1072 }
1073
1074 static int gfs2_journalid_wait(void *word)
1075 {
1076         if (signal_pending(current))
1077                 return -EINTR;
1078         schedule();
1079         return 0;
1080 }
1081
1082 static int wait_on_journal(struct gfs2_sbd *sdp)
1083 {
1084         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1085                 return 0;
1086
1087         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1088 }
1089
1090 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1091 {
1092         struct super_block *sb = sdp->sd_vfs;
1093         char ro[20];
1094         char spectator[20];
1095         char *envp[] = { ro, spectator, NULL };
1096         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1097         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1098         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1099 }
1100
1101 /**
1102  * fill_super - Read in superblock
1103  * @sb: The VFS superblock
1104  * @data: Mount options
1105  * @silent: Don't complain if it's not a GFS2 filesystem
1106  *
1107  * Returns: errno
1108  */
1109
1110 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1111 {
1112         struct gfs2_sbd *sdp;
1113         struct gfs2_holder mount_gh;
1114         int error;
1115
1116         sdp = init_sbd(sb);
1117         if (!sdp) {
1118                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1119                 return -ENOMEM;
1120         }
1121         sdp->sd_args = *args;
1122
1123         if (sdp->sd_args.ar_spectator) {
1124                 sb->s_flags |= MS_RDONLY;
1125                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1126         }
1127         if (sdp->sd_args.ar_posix_acl)
1128                 sb->s_flags |= MS_POSIXACL;
1129         if (sdp->sd_args.ar_nobarrier)
1130                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1131
1132         sb->s_flags |= MS_NOSEC;
1133         sb->s_magic = GFS2_MAGIC;
1134         sb->s_op = &gfs2_super_ops;
1135         sb->s_d_op = &gfs2_dops;
1136         sb->s_export_op = &gfs2_export_ops;
1137         sb->s_xattr = gfs2_xattr_handlers;
1138         sb->s_qcop = &gfs2_quotactl_ops;
1139         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1140         sb->s_time_gran = 1;
1141         sb->s_maxbytes = MAX_LFS_FILESIZE;
1142
1143         /* Set up the buffer cache and fill in some fake block size values
1144            to allow us to read-in the on-disk superblock. */
1145         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1146         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1147         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1148                                GFS2_BASIC_BLOCK_SHIFT;
1149         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1150
1151         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1152         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1153         if (sdp->sd_args.ar_statfs_quantum) {
1154                 sdp->sd_tune.gt_statfs_slow = 0;
1155                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1156         } else {
1157                 sdp->sd_tune.gt_statfs_slow = 1;
1158                 sdp->sd_tune.gt_statfs_quantum = 30;
1159         }
1160
1161         error = init_names(sdp, silent);
1162         if (error) {
1163                 /* In this case, we haven't initialized sysfs, so we have to
1164                    manually free the sdp. */
1165                 free_percpu(sdp->sd_lkstats);
1166                 kfree(sdp);
1167                 sb->s_fs_info = NULL;
1168                 return error;
1169         }
1170
1171         snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1172
1173         error = gfs2_sys_fs_add(sdp);
1174         /*
1175          * If we hit an error here, gfs2_sys_fs_add will have called function
1176          * kobject_put which causes the sysfs usage count to go to zero, which
1177          * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1178          * Subsequent error paths here will call gfs2_sys_fs_del, which also
1179          * kobject_put to free sdp.
1180          */
1181         if (error)
1182                 return error;
1183
1184         gfs2_create_debugfs_file(sdp);
1185
1186         error = gfs2_lm_mount(sdp, silent);
1187         if (error)
1188                 goto fail_debug;
1189
1190         error = init_locking(sdp, &mount_gh, DO);
1191         if (error)
1192                 goto fail_lm;
1193
1194         error = init_sb(sdp, silent);
1195         if (error)
1196                 goto fail_locking;
1197
1198         error = wait_on_journal(sdp);
1199         if (error)
1200                 goto fail_sb;
1201
1202         /*
1203          * If user space has failed to join the cluster or some similar
1204          * failure has occurred, then the journal id will contain a
1205          * negative (error) number. This will then be returned to the
1206          * caller (of the mount syscall). We do this even for spectator
1207          * mounts (which just write a jid of 0 to indicate "ok" even though
1208          * the jid is unused in the spectator case)
1209          */
1210         if (sdp->sd_lockstruct.ls_jid < 0) {
1211                 error = sdp->sd_lockstruct.ls_jid;
1212                 sdp->sd_lockstruct.ls_jid = 0;
1213                 goto fail_sb;
1214         }
1215
1216         if (sdp->sd_args.ar_spectator)
1217                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1218                          sdp->sd_table_name);
1219         else
1220                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1221                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1222
1223         error = init_inodes(sdp, DO);
1224         if (error)
1225                 goto fail_sb;
1226
1227         error = init_per_node(sdp, DO);
1228         if (error)
1229                 goto fail_inodes;
1230
1231         error = gfs2_statfs_init(sdp);
1232         if (error) {
1233                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1234                 goto fail_per_node;
1235         }
1236
1237         if (!(sb->s_flags & MS_RDONLY)) {
1238                 error = gfs2_make_fs_rw(sdp);
1239                 if (error) {
1240                         fs_err(sdp, "can't make FS RW: %d\n", error);
1241                         goto fail_per_node;
1242                 }
1243         }
1244
1245         gfs2_glock_dq_uninit(&mount_gh);
1246         gfs2_online_uevent(sdp);
1247         return 0;
1248
1249 fail_per_node:
1250         init_per_node(sdp, UNDO);
1251 fail_inodes:
1252         init_inodes(sdp, UNDO);
1253 fail_sb:
1254         if (sdp->sd_root_dir)
1255                 dput(sdp->sd_root_dir);
1256         if (sdp->sd_master_dir)
1257                 dput(sdp->sd_master_dir);
1258         if (sb->s_root)
1259                 dput(sb->s_root);
1260         sb->s_root = NULL;
1261 fail_locking:
1262         init_locking(sdp, &mount_gh, UNDO);
1263 fail_lm:
1264         gfs2_gl_hash_clear(sdp);
1265         gfs2_lm_unmount(sdp);
1266 fail_debug:
1267         gfs2_delete_debugfs_file(sdp);
1268         free_percpu(sdp->sd_lkstats);
1269         /* gfs2_sys_fs_del must be the last thing we do, since it causes
1270          * sysfs to call function gfs2_sbd_release, which frees sdp. */
1271         gfs2_sys_fs_del(sdp);
1272         sb->s_fs_info = NULL;
1273         return error;
1274 }
1275
1276 static int set_gfs2_super(struct super_block *s, void *data)
1277 {
1278         s->s_bdev = data;
1279         s->s_dev = s->s_bdev->bd_dev;
1280
1281         /*
1282          * We set the bdi here to the queue backing, file systems can
1283          * overwrite this in ->fill_super()
1284          */
1285         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1286         return 0;
1287 }
1288
1289 static int test_gfs2_super(struct super_block *s, void *ptr)
1290 {
1291         struct block_device *bdev = ptr;
1292         return (bdev == s->s_bdev);
1293 }
1294
1295 /**
1296  * gfs2_mount - Get the GFS2 superblock
1297  * @fs_type: The GFS2 filesystem type
1298  * @flags: Mount flags
1299  * @dev_name: The name of the device
1300  * @data: The mount arguments
1301  *
1302  * Q. Why not use get_sb_bdev() ?
1303  * A. We need to select one of two root directories to mount, independent
1304  *    of whether this is the initial, or subsequent, mount of this sb
1305  *
1306  * Returns: 0 or -ve on error
1307  */
1308
1309 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1310                        const char *dev_name, void *data)
1311 {
1312         struct block_device *bdev;
1313         struct super_block *s;
1314         fmode_t mode = FMODE_READ | FMODE_EXCL;
1315         int error;
1316         struct gfs2_args args;
1317         struct gfs2_sbd *sdp;
1318
1319         if (!(flags & MS_RDONLY))
1320                 mode |= FMODE_WRITE;
1321
1322         bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1323         if (IS_ERR(bdev))
1324                 return ERR_CAST(bdev);
1325
1326         /*
1327          * once the super is inserted into the list by sget, s_umount
1328          * will protect the lockfs code from trying to start a snapshot
1329          * while we are mounting
1330          */
1331         mutex_lock(&bdev->bd_fsfreeze_mutex);
1332         if (bdev->bd_fsfreeze_count > 0) {
1333                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1334                 error = -EBUSY;
1335                 goto error_bdev;
1336         }
1337         s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1338         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1339         error = PTR_ERR(s);
1340         if (IS_ERR(s))
1341                 goto error_bdev;
1342
1343         if (s->s_root) {
1344                 /*
1345                  * s_umount nests inside bd_mutex during
1346                  * __invalidate_device().  blkdev_put() acquires
1347                  * bd_mutex and can't be called under s_umount.  Drop
1348                  * s_umount temporarily.  This is safe as we're
1349                  * holding an active reference.
1350                  */
1351                 up_write(&s->s_umount);
1352                 blkdev_put(bdev, mode);
1353                 down_write(&s->s_umount);
1354         }
1355
1356         memset(&args, 0, sizeof(args));
1357         args.ar_quota = GFS2_QUOTA_DEFAULT;
1358         args.ar_data = GFS2_DATA_DEFAULT;
1359         args.ar_commit = 30;
1360         args.ar_statfs_quantum = 30;
1361         args.ar_quota_quantum = 60;
1362         args.ar_errors = GFS2_ERRORS_DEFAULT;
1363
1364         error = gfs2_mount_args(&args, data);
1365         if (error) {
1366                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1367                 goto error_super;
1368         }
1369
1370         if (s->s_root) {
1371                 error = -EBUSY;
1372                 if ((flags ^ s->s_flags) & MS_RDONLY)
1373                         goto error_super;
1374         } else {
1375                 char b[BDEVNAME_SIZE];
1376
1377                 s->s_mode = mode;
1378                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1379                 sb_set_blocksize(s, block_size(bdev));
1380                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1381                 if (error)
1382                         goto error_super;
1383                 s->s_flags |= MS_ACTIVE;
1384                 bdev->bd_super = s;
1385         }
1386
1387         sdp = s->s_fs_info;
1388         if (args.ar_meta)
1389                 return dget(sdp->sd_master_dir);
1390         else
1391                 return dget(sdp->sd_root_dir);
1392
1393 error_super:
1394         deactivate_locked_super(s);
1395         return ERR_PTR(error);
1396 error_bdev:
1397         blkdev_put(bdev, mode);
1398         return ERR_PTR(error);
1399 }
1400
1401 static int set_meta_super(struct super_block *s, void *ptr)
1402 {
1403         return -EINVAL;
1404 }
1405
1406 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1407                         int flags, const char *dev_name, void *data)
1408 {
1409         struct super_block *s;
1410         struct gfs2_sbd *sdp;
1411         struct path path;
1412         int error;
1413
1414         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1415         if (error) {
1416                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1417                        dev_name, error);
1418                 return ERR_PTR(error);
1419         }
1420         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1421                  path.dentry->d_inode->i_sb->s_bdev);
1422         path_put(&path);
1423         if (IS_ERR(s)) {
1424                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1425                 return ERR_CAST(s);
1426         }
1427         if ((flags ^ s->s_flags) & MS_RDONLY) {
1428                 deactivate_locked_super(s);
1429                 return ERR_PTR(-EBUSY);
1430         }
1431         sdp = s->s_fs_info;
1432         return dget(sdp->sd_master_dir);
1433 }
1434
1435 static void gfs2_kill_sb(struct super_block *sb)
1436 {
1437         struct gfs2_sbd *sdp = sb->s_fs_info;
1438
1439         if (sdp == NULL) {
1440                 kill_block_super(sb);
1441                 return;
1442         }
1443
1444         gfs2_meta_syncfs(sdp);
1445         dput(sdp->sd_root_dir);
1446         dput(sdp->sd_master_dir);
1447         sdp->sd_root_dir = NULL;
1448         sdp->sd_master_dir = NULL;
1449         shrink_dcache_sb(sb);
1450         gfs2_delete_debugfs_file(sdp);
1451         free_percpu(sdp->sd_lkstats);
1452         kill_block_super(sb);
1453 }
1454
1455 struct file_system_type gfs2_fs_type = {
1456         .name = "gfs2",
1457         .fs_flags = FS_REQUIRES_DEV,
1458         .mount = gfs2_mount,
1459         .kill_sb = gfs2_kill_sb,
1460         .owner = THIS_MODULE,
1461 };
1462 MODULE_ALIAS_FS("gfs2");
1463
1464 struct file_system_type gfs2meta_fs_type = {
1465         .name = "gfs2meta",
1466         .fs_flags = FS_REQUIRES_DEV,
1467         .mount = gfs2_mount_meta,
1468         .owner = THIS_MODULE,
1469 };
1470 MODULE_ALIAS_FS("gfs2meta");