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/quotaops.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "bmap.h"
  25 #include "glock.h"
  26 #include "glops.h"
  27 #include "inode.h"
  28 #include "recovery.h"
  29 #include "rgrp.h"
  30 #include "super.h"
  31 #include "sys.h"
  32 #include "util.h"
  33 #include "log.h"
  34 #include "quota.h"
  35 #include "dir.h"
  36 #include "trace_gfs2.h"
  37
  38 #define DO 0
  39 #define UNDO 1
  40
  41 /**
  42  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  43  * @gt: tune
  44  *
  45  */
  46
  47 static void gfs2_tune_init(struct gfs2_tune *gt)
  48 {
  49         spin_lock_init(&gt->gt_spin);
  50
  51         gt->gt_quota_simul_sync = 64;
  52         gt->gt_quota_warn_period = 10;
  53         gt->gt_quota_scale_num = 1;
  54         gt->gt_quota_scale_den = 1;
  55         gt->gt_new_files_jdata = 0;
  56         gt->gt_max_readahead = 1 << 18;
  57         gt->gt_complain_secs = 10;
  58 }
  59
  60 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  61 {
  62         struct gfs2_sbd *sdp;
  63
  64         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  65         if (!sdp)
  66                 return NULL;
  67
  68         sb->s_fs_info = sdp;
  69         sdp->sd_vfs = sb;
  70         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  71         gfs2_tune_init(&sdp->sd_tune);
  72
  73         init_waitqueue_head(&sdp->sd_glock_wait);
  74         atomic_set(&sdp->sd_glock_disposal, 0);
  75         spin_lock_init(&sdp->sd_statfs_spin);
  76
  77         spin_lock_init(&sdp->sd_rindex_spin);
  78         mutex_init(&sdp->sd_rindex_mutex);
  79         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  80         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  81
  82         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  83         spin_lock_init(&sdp->sd_jindex_spin);
  84         mutex_init(&sdp->sd_jindex_mutex);
  85
  86         INIT_LIST_HEAD(&sdp->sd_quota_list);
  87         mutex_init(&sdp->sd_quota_mutex);
  88         init_waitqueue_head(&sdp->sd_quota_wait);
  89         INIT_LIST_HEAD(&sdp->sd_trunc_list);
  90         spin_lock_init(&sdp->sd_trunc_lock);
  91
  92         spin_lock_init(&sdp->sd_log_lock);
  93         atomic_set(&sdp->sd_log_pinned, 0);
  94         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  95         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  96         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  97         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  98         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
  99
 100         init_waitqueue_head(&sdp->sd_log_waitq);
 101         init_waitqueue_head(&sdp->sd_logd_waitq);
 102         spin_lock_init(&sdp->sd_ail_lock);
 103         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 104         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 105
 106         init_rwsem(&sdp->sd_log_flush_lock);
 107         atomic_set(&sdp->sd_log_in_flight, 0);
 108         init_waitqueue_head(&sdp->sd_log_flush_wait);
 109
 110         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 111
 112         mutex_init(&sdp->sd_freeze_lock);
 113
 114         return sdp;
 115 }
 116
 117
 118 /**
 119  * gfs2_check_sb - Check superblock
 120  * @sdp: the filesystem
 121  * @sb: The superblock
 122  * @silent: Don't print a message if the check fails
 123  *
 124  * Checks the version code of the FS is one that we understand how to
 125  * read and that the sizes of the various on-disk structures have not
 126  * changed.
 127  */
 128
 129 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 130 {
 131         struct gfs2_sb_host *sb = &sdp->sd_sb;
 132
 133         if (sb->sb_magic != GFS2_MAGIC ||
 134             sb->sb_type != GFS2_METATYPE_SB) {
 135                 if (!silent)
 136                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 137                 return -EINVAL;
 138         }
 139
 140         /*  If format numbers match exactly, we're done.  */
 141
 142         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 143             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 144                 return 0;
 145
 146         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 147
 148         return -EINVAL;
 149 }
 150
 151 static void end_bio_io_page(struct bio *bio, int error)
 152 {
 153         struct page *page = bio->bi_private;
 154
 155         if (!error)
 156                 SetPageUptodate(page);
 157         else
 158                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 159         unlock_page(page);
 160 }
 161
 162 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 163 {
 164         struct gfs2_sb_host *sb = &sdp->sd_sb;
 165         struct super_block *s = sdp->sd_vfs;
 166         const struct gfs2_sb *str = buf;
 167
 168         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 169         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 170         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 171         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 172         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 173         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 174         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 175         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 176         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 177         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 178         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 179
 180         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 181         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 182         memcpy(s->s_uuid, str->sb_uuid, 16);
 183 }
 184
 185 /**
 186  * gfs2_read_super - Read the gfs2 super block from disk
 187  * @sdp: The GFS2 super block
 188  * @sector: The location of the super block
 189  * @error: The error code to return
 190  *
 191  * This uses the bio functions to read the super block from disk
 192  * because we want to be 100% sure that we never read cached data.
 193  * A super block is read twice only during each GFS2 mount and is
 194  * never written to by the filesystem. The first time its read no
 195  * locks are held, and the only details which are looked at are those
 196  * relating to the locking protocol. Once locking is up and working,
 197  * the sb is read again under the lock to establish the location of
 198  * the master directory (contains pointers to journals etc) and the
 199  * root directory.
 200  *
 201  * Returns: 0 on success or error
 202  */
 203
 204 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 205 {
 206         struct super_block *sb = sdp->sd_vfs;
 207         struct gfs2_sb *p;
 208         struct page *page;
 209         struct bio *bio;
 210
 211         page = alloc_page(GFP_NOFS);
 212         if (unlikely(!page))
 213                 return -ENOBUFS;
 214
 215         ClearPageUptodate(page);
 216         ClearPageDirty(page);
 217         lock_page(page);
 218
 219         bio = bio_alloc(GFP_NOFS, 1);
 220         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 221         bio->bi_bdev = sb->s_bdev;
 222         bio_add_page(bio, page, PAGE_SIZE, 0);
 223
 224         bio->bi_end_io = end_bio_io_page;
 225         bio->bi_private = page;
 226         submit_bio(READ_SYNC | REQ_META, bio);
 227         wait_on_page_locked(page);
 228         bio_put(bio);
 229         if (!PageUptodate(page)) {
 230                 __free_page(page);
 231                 return -EIO;
 232         }
 233         p = kmap(page);
 234         gfs2_sb_in(sdp, p);
 235         kunmap(page);
 236         __free_page(page);
 237         return gfs2_check_sb(sdp, silent);
 238 }
 239
 240 /**
 241  * gfs2_read_sb - Read super block
 242  * @sdp: The GFS2 superblock
 243  * @silent: Don't print message if mount fails
 244  *
 245  */
 246
 247 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 248 {
 249         u32 hash_blocks, ind_blocks, leaf_blocks;
 250         u32 tmp_blocks;
 251         unsigned int x;
 252         int error;
 253
 254         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 255         if (error) {
 256                 if (!silent)
 257                         fs_err(sdp, "can't read superblock\n");
 258                 return error;
 259         }
 260
 261         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 262                                GFS2_BASIC_BLOCK_SHIFT;
 263         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 264         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 265                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 266         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 267                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 268         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 269         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 270         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 271         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 272         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 273                                 sizeof(struct gfs2_meta_header)) /
 274                                 sizeof(struct gfs2_quota_change);
 275
 276         /* Compute maximum reservation required to add a entry to a directory */
 277
 278         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 279                              sdp->sd_jbsize);
 280
 281         ind_blocks = 0;
 282         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 283                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 284                 ind_blocks += tmp_blocks;
 285         }
 286
 287         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 288
 289         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 290
 291         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 292                                 sizeof(struct gfs2_dinode);
 293         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 294         for (x = 2;; x++) {
 295                 u64 space, d;
 296                 u32 m;
 297
 298                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 299                 d = space;
 300                 m = do_div(d, sdp->sd_inptrs);
 301
 302                 if (d != sdp->sd_heightsize[x - 1] || m)
 303                         break;
 304                 sdp->sd_heightsize[x] = space;
 305         }
 306         sdp->sd_max_height = x;
 307         sdp->sd_heightsize[x] = ~0;
 308         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 309
 310         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 311                                  sizeof(struct gfs2_dinode);
 312         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 313         for (x = 2;; x++) {
 314                 u64 space, d;
 315                 u32 m;
 316
 317                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 318                 d = space;
 319                 m = do_div(d, sdp->sd_inptrs);
 320
 321                 if (d != sdp->sd_jheightsize[x - 1] || m)
 322                         break;
 323                 sdp->sd_jheightsize[x] = space;
 324         }
 325         sdp->sd_max_jheight = x;
 326         sdp->sd_jheightsize[x] = ~0;
 327         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 328
 329         return 0;
 330 }
 331
 332 static int init_names(struct gfs2_sbd *sdp, int silent)
 333 {
 334         char *proto, *table;
 335         int error = 0;
 336
 337         proto = sdp->sd_args.ar_lockproto;
 338         table = sdp->sd_args.ar_locktable;
 339
 340         /*  Try to autodetect  */
 341
 342         if (!proto[0] || !table[0]) {
 343                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 344                 if (error)
 345                         return error;
 346
 347                 if (!proto[0])
 348                         proto = sdp->sd_sb.sb_lockproto;
 349                 if (!table[0])
 350                         table = sdp->sd_sb.sb_locktable;
 351         }
 352
 353         if (!table[0])
 354                 table = sdp->sd_vfs->s_id;
 355
 356         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 357         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 358
 359         table = sdp->sd_table_name;
 360         while ((table = strchr(table, '/')))
 361                 *table = '_';
 362
 363         return error;
 364 }
 365
 366 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 367                         int undo)
 368 {
 369         int error = 0;
 370
 371         if (undo)
 372                 goto fail_trans;
 373
 374         error = gfs2_glock_nq_num(sdp,
 375                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 376                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 377                                   mount_gh);
 378         if (error) {
 379                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 380                 goto fail;
 381         }
 382
 383         error = gfs2_glock_nq_num(sdp,
 384                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 385                                   LM_ST_SHARED,
 386                                   LM_FLAG_NOEXP | GL_EXACT,
 387                                   &sdp->sd_live_gh);
 388         if (error) {
 389                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 390                 goto fail_mount;
 391         }
 392
 393         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 394                                CREATE, &sdp->sd_rename_gl);
 395         if (error) {
 396                 fs_err(sdp, "can't create rename glock: %d\n", error);
 397                 goto fail_live;
 398         }
 399
 400         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 401                                CREATE, &sdp->sd_trans_gl);
 402         if (error) {
 403                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 404                 goto fail_rename;
 405         }
 406
 407         return 0;
 408
 409 fail_trans:
 410         gfs2_glock_put(sdp->sd_trans_gl);
 411 fail_rename:
 412         gfs2_glock_put(sdp->sd_rename_gl);
 413 fail_live:
 414         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 415 fail_mount:
 416         gfs2_glock_dq_uninit(mount_gh);
 417 fail:
 418         return error;
 419 }
 420
 421 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 422                             u64 no_addr, const char *name)
 423 {
 424         struct gfs2_sbd *sdp = sb->s_fs_info;
 425         struct dentry *dentry;
 426         struct inode *inode;
 427
 428         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 429         if (IS_ERR(inode)) {
 430                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 431                 return PTR_ERR(inode);
 432         }
 433         dentry = d_alloc_root(inode);
 434         if (!dentry) {
 435                 fs_err(sdp, "can't alloc %s dentry\n", name);
 436                 iput(inode);
 437                 return -ENOMEM;
 438         }
 439         *dptr = dentry;
 440         return 0;
 441 }
 442
 443 static int init_sb(struct gfs2_sbd *sdp, int silent)
 444 {
 445         struct super_block *sb = sdp->sd_vfs;
 446         struct gfs2_holder sb_gh;
 447         u64 no_addr;
 448         int ret;
 449
 450         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 451                                 LM_ST_SHARED, 0, &sb_gh);
 452         if (ret) {
 453                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 454                 return ret;
 455         }
 456
 457         ret = gfs2_read_sb(sdp, silent);
 458         if (ret) {
 459                 fs_err(sdp, "can't read superblock: %d\n", ret);
 460                 goto out;
 461         }
 462
 463         /* Set up the buffer cache and SB for real */
 464         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 465                 ret = -EINVAL;
 466                 fs_err(sdp, "FS block size (%u) is too small for device "
 467                        "block size (%u)\n",
 468                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 469                 goto out;
 470         }
 471         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 472                 ret = -EINVAL;
 473                 fs_err(sdp, "FS block size (%u) is too big for machine "
 474                        "page size (%u)\n",
 475                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 476                 goto out;
 477         }
 478         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 479
 480         /* Get the root inode */
 481         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 482         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 483         if (ret)
 484                 goto out;
 485
 486         /* Get the master inode */
 487         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 488         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 489         if (ret) {
 490                 dput(sdp->sd_root_dir);
 491                 goto out;
 492         }
 493         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 494 out:
 495         gfs2_glock_dq_uninit(&sb_gh);
 496         return ret;
 497 }
 498
 499 /**
 500  * map_journal_extents - create a reusable "extent" mapping from all logical
 501  * blocks to all physical blocks for the given journal.  This will save
 502  * us time when writing journal blocks.  Most journals will have only one
 503  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 504  * arranges the journal blocks sequentially to maximize performance.
 505  * So the extent would map the first block for the entire file length.
 506  * However, gfs2_jadd can happen while file activity is happening, so
 507  * those journals may not be sequential.  Less likely is the case where
 508  * the users created their own journals by mounting the metafs and
 509  * laying it out.  But it's still possible.  These journals might have
 510  * several extents.
 511  *
 512  * TODO: This should be done in bigger chunks rather than one block at a time,
 513  *       but since it's only done at mount time, I'm not worried about the
 514  *       time it takes.
 515  */
 516 static int map_journal_extents(struct gfs2_sbd *sdp)
 517 {
 518         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 519         unsigned int lb;
 520         u64 db, prev_db; /* logical block, disk block, prev disk block */
 521         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 522         struct gfs2_journal_extent *jext = NULL;
 523         struct buffer_head bh;
 524         int rc = 0;
 525
 526         prev_db = 0;
 527
 528         for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
 529                 bh.b_state = 0;
 530                 bh.b_blocknr = 0;
 531                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 532                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 533                 db = bh.b_blocknr;
 534                 if (rc || !db) {
 535                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 536                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 537                         break;
 538                 }
 539                 if (!prev_db || db != prev_db + 1) {
 540                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 541                                        GFP_KERNEL);
 542                         if (!jext) {
 543                                 printk(KERN_INFO "GFS2 error: out of memory "
 544                                        "mapping journal extents.\n");
 545                                 rc = -ENOMEM;
 546                                 break;
 547                         }
 548                         jext->dblock = db;
 549                         jext->lblock = lb;
 550                         jext->blocks = 1;
 551                         list_add_tail(&jext->extent_list, &jd->extent_list);
 552                 } else {
 553                         jext->blocks++;
 554                 }
 555                 prev_db = db;
 556         }
 557         return rc;
 558 }
 559
 560 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 561 {
 562         char *message = "FIRSTMOUNT=Done";
 563         char *envp[] = { message, NULL };
 564         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 565         ls->ls_first_done = 1;
 566         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 567 }
 568
 569 /**
 570  * gfs2_jindex_hold - Grab a lock on the jindex
 571  * @sdp: The GFS2 superblock
 572  * @ji_gh: the holder for the jindex glock
 573  *
 574  * Returns: errno
 575  */
 576
 577 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 578 {
 579         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 580         struct qstr name;
 581         char buf[20];
 582         struct gfs2_jdesc *jd;
 583         int error;
 584
 585         name.name = buf;
 586
 587         mutex_lock(&sdp->sd_jindex_mutex);
 588
 589         for (;;) {
 590                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 591                 if (error)
 592                         break;
 593
 594                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 595                 name.hash = gfs2_disk_hash(name.name, name.len);
 596
 597                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 598                 if (error == -ENOENT) {
 599                         error = 0;
 600                         break;
 601                 }
 602
 603                 gfs2_glock_dq_uninit(ji_gh);
 604
 605                 if (error)
 606                         break;
 607
 608                 error = -ENOMEM;
 609                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 610                 if (!jd)
 611                         break;
 612
 613                 INIT_LIST_HEAD(&jd->extent_list);
 614                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 615                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 616                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 617                         if (!jd->jd_inode)
 618                                 error = -ENOENT;
 619                         else
 620                                 error = PTR_ERR(jd->jd_inode);
 621                         kfree(jd);
 622                         break;
 623                 }
 624
 625                 spin_lock(&sdp->sd_jindex_spin);
 626                 jd->jd_jid = sdp->sd_journals++;
 627                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 628                 spin_unlock(&sdp->sd_jindex_spin);
 629         }
 630
 631         mutex_unlock(&sdp->sd_jindex_mutex);
 632
 633         return error;
 634 }
 635
 636 static int init_journal(struct gfs2_sbd *sdp, int undo)
 637 {
 638         struct inode *master = sdp->sd_master_dir->d_inode;
 639         struct gfs2_holder ji_gh;
 640         struct gfs2_inode *ip;
 641         int jindex = 1;
 642         int error = 0;
 643
 644         if (undo) {
 645                 jindex = 0;
 646                 goto fail_jinode_gh;
 647         }
 648
 649         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 650         if (IS_ERR(sdp->sd_jindex)) {
 651                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 652                 return PTR_ERR(sdp->sd_jindex);
 653         }
 654         ip = GFS2_I(sdp->sd_jindex);
 655
 656         /* Load in the journal index special file */
 657
 658         error = gfs2_jindex_hold(sdp, &ji_gh);
 659         if (error) {
 660                 fs_err(sdp, "can't read journal index: %d\n", error);
 661                 goto fail;
 662         }
 663
 664         error = -EUSERS;
 665         if (!gfs2_jindex_size(sdp)) {
 666                 fs_err(sdp, "no journals!\n");
 667                 goto fail_jindex;
 668         }
 669
 670         if (sdp->sd_args.ar_spectator) {
 671                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 672                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 673                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 674                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 675         } else {
 676                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 677                         fs_err(sdp, "can't mount journal #%u\n",
 678                                sdp->sd_lockstruct.ls_jid);
 679                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 680                                gfs2_jindex_size(sdp),
 681                                gfs2_jindex_size(sdp) - 1);
 682                         goto fail_jindex;
 683                 }
 684                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 685
 686                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 687                                           &gfs2_journal_glops,
 688                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 689                                           &sdp->sd_journal_gh);
 690                 if (error) {
 691                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 692                         goto fail_jindex;
 693                 }
 694
 695                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 696                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 697                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 698                                            &sdp->sd_jinode_gh);
 699                 if (error) {
 700                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 701                                error);
 702                         goto fail_journal_gh;
 703                 }
 704
 705                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 706                 if (error) {
 707                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 708                                sdp->sd_jdesc->jd_jid, error);
 709                         goto fail_jinode_gh;
 710                 }
 711                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 712                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 713                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 714
 715                 /* Map the extents for this journal's blocks */
 716                 map_journal_extents(sdp);
 717         }
 718         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 719
 720         if (sdp->sd_lockstruct.ls_first) {
 721                 unsigned int x;
 722                 for (x = 0; x < sdp->sd_journals; x++) {
 723                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
 724                                                      true);
 725                         if (error) {
 726                                 fs_err(sdp, "error recovering journal %u: %d\n",
 727                                        x, error);
 728                                 goto fail_jinode_gh;
 729                         }
 730                 }
 731
 732                 gfs2_others_may_mount(sdp);
 733         } else if (!sdp->sd_args.ar_spectator) {
 734                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 735                 if (error) {
 736                         fs_err(sdp, "error recovering my journal: %d\n", error);
 737                         goto fail_jinode_gh;
 738                 }
 739         }
 740
 741         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 742         gfs2_glock_dq_uninit(&ji_gh);
 743         jindex = 0;
 744
 745         return 0;
 746
 747 fail_jinode_gh:
 748         if (!sdp->sd_args.ar_spectator)
 749                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 750 fail_journal_gh:
 751         if (!sdp->sd_args.ar_spectator)
 752                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 753 fail_jindex:
 754         gfs2_jindex_free(sdp);
 755         if (jindex)
 756                 gfs2_glock_dq_uninit(&ji_gh);
 757 fail:
 758         iput(sdp->sd_jindex);
 759         return error;
 760 }
 761
 762
 763 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 764 {
 765         int error = 0;
 766         struct gfs2_inode *ip;
 767         struct inode *master = sdp->sd_master_dir->d_inode;
 768
 769         if (undo)
 770                 goto fail_qinode;
 771
 772         error = init_journal(sdp, undo);
 773         if (error)
 774                 goto fail;
 775
 776         /* Read in the master statfs inode */
 777         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 778         if (IS_ERR(sdp->sd_statfs_inode)) {
 779                 error = PTR_ERR(sdp->sd_statfs_inode);
 780                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 781                 goto fail_journal;
 782         }
 783
 784         /* Read in the resource index inode */
 785         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 786         if (IS_ERR(sdp->sd_rindex)) {
 787                 error = PTR_ERR(sdp->sd_rindex);
 788                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 789                 goto fail_statfs;
 790         }
 791         ip = GFS2_I(sdp->sd_rindex);
 792         sdp->sd_rindex_uptodate = 0;
 793
 794         /* Read in the quota inode */
 795         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 796         if (IS_ERR(sdp->sd_quota_inode)) {
 797                 error = PTR_ERR(sdp->sd_quota_inode);
 798                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 799                 goto fail_rindex;
 800         }
 801         return 0;
 802
 803 fail_qinode:
 804         iput(sdp->sd_quota_inode);
 805 fail_rindex:
 806         gfs2_clear_rgrpd(sdp);
 807         iput(sdp->sd_rindex);
 808 fail_statfs:
 809         iput(sdp->sd_statfs_inode);
 810 fail_journal:
 811         init_journal(sdp, UNDO);
 812 fail:
 813         return error;
 814 }
 815
 816 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 817 {
 818         struct inode *pn = NULL;
 819         char buf[30];
 820         int error = 0;
 821         struct gfs2_inode *ip;
 822         struct inode *master = sdp->sd_master_dir->d_inode;
 823
 824         if (sdp->sd_args.ar_spectator)
 825                 return 0;
 826
 827         if (undo)
 828                 goto fail_qc_gh;
 829
 830         pn = gfs2_lookup_simple(master, "per_node");
 831         if (IS_ERR(pn)) {
 832                 error = PTR_ERR(pn);
 833                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 834                 return error;
 835         }
 836
 837         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 838         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 839         if (IS_ERR(sdp->sd_sc_inode)) {
 840                 error = PTR_ERR(sdp->sd_sc_inode);
 841                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 842                 goto fail;
 843         }
 844
 845         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 846         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 847         if (IS_ERR(sdp->sd_qc_inode)) {
 848                 error = PTR_ERR(sdp->sd_qc_inode);
 849                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 850                 goto fail_ut_i;
 851         }
 852
 853         iput(pn);
 854         pn = NULL;
 855
 856         ip = GFS2_I(sdp->sd_sc_inode);
 857         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 858                                    &sdp->sd_sc_gh);
 859         if (error) {
 860                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 861                 goto fail_qc_i;
 862         }
 863
 864         ip = GFS2_I(sdp->sd_qc_inode);
 865         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 866                                    &sdp->sd_qc_gh);
 867         if (error) {
 868                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 869                 goto fail_ut_gh;
 870         }
 871
 872         return 0;
 873
 874 fail_qc_gh:
 875         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 876 fail_ut_gh:
 877         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 878 fail_qc_i:
 879         iput(sdp->sd_qc_inode);
 880 fail_ut_i:
 881         iput(sdp->sd_sc_inode);
 882 fail:
 883         if (pn)
 884                 iput(pn);
 885         return error;
 886 }
 887
 888 static int init_threads(struct gfs2_sbd *sdp, int undo)
 889 {
 890         struct task_struct *p;
 891         int error = 0;
 892
 893         if (undo)
 894                 goto fail_quotad;
 895
 896         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 897         error = IS_ERR(p);
 898         if (error) {
 899                 fs_err(sdp, "can't start logd thread: %d\n", error);
 900                 return error;
 901         }
 902         sdp->sd_logd_process = p;
 903
 904         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 905         error = IS_ERR(p);
 906         if (error) {
 907                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 908                 goto fail;
 909         }
 910         sdp->sd_quotad_process = p;
 911
 912         return 0;
 913
 914
 915 fail_quotad:
 916         kthread_stop(sdp->sd_quotad_process);
 917 fail:
 918         kthread_stop(sdp->sd_logd_process);
 919         return error;
 920 }
 921
 922 static const match_table_t nolock_tokens = {
 923         { Opt_jid, "jid=%d\n", },
 924         { Opt_err, NULL },
 925 };
 926
 927 static const struct lm_lockops nolock_ops = {
 928         .lm_proto_name = "lock_nolock",
 929         .lm_put_lock = gfs2_glock_free,
 930         .lm_tokens = &nolock_tokens,
 931 };
 932
 933 /**
 934  * gfs2_lm_mount - mount a locking protocol
 935  * @sdp: the filesystem
 936  * @args: mount arguments
 937  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 938  *
 939  * Returns: errno
 940  */
 941
 942 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 943 {
 944         const struct lm_lockops *lm;
 945         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 946         struct gfs2_args *args = &sdp->sd_args;
 947         const char *proto = sdp->sd_proto_name;
 948         const char *table = sdp->sd_table_name;
 949         const char *fsname;
 950         char *o, *options;
 951         int ret;
 952
 953         if (!strcmp("lock_nolock", proto)) {
 954                 lm = &nolock_ops;
 955                 sdp->sd_args.ar_localflocks = 1;
 956 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 957         } else if (!strcmp("lock_dlm", proto)) {
 958                 lm = &gfs2_dlm_ops;
 959 #endif
 960         } else {
 961                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
 962                 return -ENOENT;
 963         }
 964
 965         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 966
 967         ls->ls_ops = lm;
 968         ls->ls_first = 1;
 969
 970         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 971                 substring_t tmp[MAX_OPT_ARGS];
 972                 int token, option;
 973
 974                 if (!o || !*o)
 975                         continue;
 976
 977                 token = match_token(o, *lm->lm_tokens, tmp);
 978                 switch (token) {
 979                 case Opt_jid:
 980                         ret = match_int(&tmp[0], &option);
 981                         if (ret || option < 0)
 982                                 goto hostdata_error;
 983                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 984                                 ls->ls_jid = option;
 985                         break;
 986                 case Opt_id:
 987                         /* Obsolete, but left for backward compat purposes */
 988                         break;
 989                 case Opt_first:
 990                         ret = match_int(&tmp[0], &option);
 991                         if (ret || (option != 0 && option != 1))
 992                                 goto hostdata_error;
 993                         ls->ls_first = option;
 994                         break;
 995                 case Opt_nodir:
 996                         ret = match_int(&tmp[0], &option);
 997                         if (ret || (option != 0 && option != 1))
 998                                 goto hostdata_error;
 999                         ls->ls_nodir = option;
1000                         break;
1001                 case Opt_err:
1002                 default:
1003 hostdata_error:
1004                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1005                         return -EINVAL;
1006                 }
1007         }
1008
1009         if (sdp->sd_args.ar_spectator)
1010                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1011         else
1012                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1013                          sdp->sd_lockstruct.ls_jid);
1014
1015         fsname = strchr(table, ':');
1016         if (fsname)
1017                 fsname++;
1018         if (lm->lm_mount == NULL) {
1019                 fs_info(sdp, "Now mounting FS...\n");
1020                 return 0;
1021         }
1022         ret = lm->lm_mount(sdp, fsname);
1023         if (ret == 0)
1024                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1025         return ret;
1026 }
1027
1028 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1029 {
1030         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1031         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1032             lm->lm_unmount)
1033                 lm->lm_unmount(sdp);
1034 }
1035
1036 static int gfs2_journalid_wait(void *word)
1037 {
1038         if (signal_pending(current))
1039                 return -EINTR;
1040         schedule();
1041         return 0;
1042 }
1043
1044 static int wait_on_journal(struct gfs2_sbd *sdp)
1045 {
1046         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1047                 return 0;
1048
1049         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1050 }
1051
1052 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1053 {
1054         struct super_block *sb = sdp->sd_vfs;
1055         char ro[20];
1056         char spectator[20];
1057         char *envp[] = { ro, spectator, NULL };
1058         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1059         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1060         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1061 }
1062
1063 /**
1064  * fill_super - Read in superblock
1065  * @sb: The VFS superblock
1066  * @data: Mount options
1067  * @silent: Don't complain if it's not a GFS2 filesystem
1068  *
1069  * Returns: errno
1070  */
1071
1072 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1073 {
1074         struct gfs2_sbd *sdp;
1075         struct gfs2_holder mount_gh;
1076         int error;
1077
1078         sdp = init_sbd(sb);
1079         if (!sdp) {
1080                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1081                 return -ENOMEM;
1082         }
1083         sdp->sd_args = *args;
1084
1085         if (sdp->sd_args.ar_spectator) {
1086                 sb->s_flags |= MS_RDONLY;
1087                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1088         }
1089         if (sdp->sd_args.ar_posix_acl)
1090                 sb->s_flags |= MS_POSIXACL;
1091         if (sdp->sd_args.ar_nobarrier)
1092                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1093
1094         sb->s_magic = GFS2_MAGIC;
1095         sb->s_op = &gfs2_super_ops;
1096         sb->s_d_op = &gfs2_dops;
1097         sb->s_export_op = &gfs2_export_ops;
1098         sb->s_xattr = gfs2_xattr_handlers;
1099         sb->s_qcop = &gfs2_quotactl_ops;
1100         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1101         sb->s_time_gran = 1;
1102         sb->s_maxbytes = MAX_LFS_FILESIZE;
1103
1104         /* Set up the buffer cache and fill in some fake block size values
1105            to allow us to read-in the on-disk superblock. */
1106         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1107         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1108         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1109                                GFS2_BASIC_BLOCK_SHIFT;
1110         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1111
1112         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1113         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1114         if (sdp->sd_args.ar_statfs_quantum) {
1115                 sdp->sd_tune.gt_statfs_slow = 0;
1116                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1117         } else {
1118                 sdp->sd_tune.gt_statfs_slow = 1;
1119                 sdp->sd_tune.gt_statfs_quantum = 30;
1120         }
1121
1122         error = init_names(sdp, silent);
1123         if (error)
1124                 goto fail;
1125
1126         gfs2_create_debugfs_file(sdp);
1127
1128         error = gfs2_sys_fs_add(sdp);
1129         if (error)
1130                 goto fail;
1131
1132         error = gfs2_lm_mount(sdp, silent);
1133         if (error)
1134                 goto fail_sys;
1135
1136         error = init_locking(sdp, &mount_gh, DO);
1137         if (error)
1138                 goto fail_lm;
1139
1140         error = init_sb(sdp, silent);
1141         if (error)
1142                 goto fail_locking;
1143
1144         error = wait_on_journal(sdp);
1145         if (error)
1146                 goto fail_sb;
1147
1148         /*
1149          * If user space has failed to join the cluster or some similar
1150          * failure has occurred, then the journal id will contain a
1151          * negative (error) number. This will then be returned to the
1152          * caller (of the mount syscall). We do this even for spectator
1153          * mounts (which just write a jid of 0 to indicate "ok" even though
1154          * the jid is unused in the spectator case)
1155          */
1156         if (sdp->sd_lockstruct.ls_jid < 0) {
1157                 error = sdp->sd_lockstruct.ls_jid;
1158                 sdp->sd_lockstruct.ls_jid = 0;
1159                 goto fail_sb;
1160         }
1161
1162         error = init_inodes(sdp, DO);
1163         if (error)
1164                 goto fail_sb;
1165
1166         error = init_per_node(sdp, DO);
1167         if (error)
1168                 goto fail_inodes;
1169
1170         error = gfs2_statfs_init(sdp);
1171         if (error) {
1172                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1173                 goto fail_per_node;
1174         }
1175
1176         error = init_threads(sdp, DO);
1177         if (error)
1178                 goto fail_per_node;
1179
1180         if (!(sb->s_flags & MS_RDONLY)) {
1181                 error = gfs2_make_fs_rw(sdp);
1182                 if (error) {
1183                         fs_err(sdp, "can't make FS RW: %d\n", error);
1184                         goto fail_threads;
1185                 }
1186         }
1187
1188         gfs2_glock_dq_uninit(&mount_gh);
1189         gfs2_online_uevent(sdp);
1190         return 0;
1191
1192 fail_threads:
1193         init_threads(sdp, UNDO);
1194 fail_per_node:
1195         init_per_node(sdp, UNDO);
1196 fail_inodes:
1197         init_inodes(sdp, UNDO);
1198 fail_sb:
1199         if (sdp->sd_root_dir)
1200                 dput(sdp->sd_root_dir);
1201         if (sdp->sd_master_dir)
1202                 dput(sdp->sd_master_dir);
1203         if (sb->s_root)
1204                 dput(sb->s_root);
1205         sb->s_root = NULL;
1206 fail_locking:
1207         init_locking(sdp, &mount_gh, UNDO);
1208 fail_lm:
1209         gfs2_gl_hash_clear(sdp);
1210         gfs2_lm_unmount(sdp);
1211 fail_sys:
1212         gfs2_sys_fs_del(sdp);
1213 fail:
1214         gfs2_delete_debugfs_file(sdp);
1215         kfree(sdp);
1216         sb->s_fs_info = NULL;
1217         return error;
1218 }
1219
1220 static int set_gfs2_super(struct super_block *s, void *data)
1221 {
1222         s->s_bdev = data;
1223         s->s_dev = s->s_bdev->bd_dev;
1224
1225         /*
1226          * We set the bdi here to the queue backing, file systems can
1227          * overwrite this in ->fill_super()
1228          */
1229         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1230         return 0;
1231 }
1232
1233 static int test_gfs2_super(struct super_block *s, void *ptr)
1234 {
1235         struct block_device *bdev = ptr;
1236         return (bdev == s->s_bdev);
1237 }
1238
1239 /**
1240  * gfs2_mount - Get the GFS2 superblock
1241  * @fs_type: The GFS2 filesystem type
1242  * @flags: Mount flags
1243  * @dev_name: The name of the device
1244  * @data: The mount arguments
1245  *
1246  * Q. Why not use get_sb_bdev() ?
1247  * A. We need to select one of two root directories to mount, independent
1248  *    of whether this is the initial, or subsequent, mount of this sb
1249  *
1250  * Returns: 0 or -ve on error
1251  */
1252
1253 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1254                        const char *dev_name, void *data)
1255 {
1256         struct block_device *bdev;
1257         struct super_block *s;
1258         fmode_t mode = FMODE_READ | FMODE_EXCL;
1259         int error;
1260         struct gfs2_args args;
1261         struct gfs2_sbd *sdp;
1262
1263         if (!(flags & MS_RDONLY))
1264                 mode |= FMODE_WRITE;
1265
1266         bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1267         if (IS_ERR(bdev))
1268                 return ERR_CAST(bdev);
1269
1270         /*
1271          * once the super is inserted into the list by sget, s_umount
1272          * will protect the lockfs code from trying to start a snapshot
1273          * while we are mounting
1274          */
1275         mutex_lock(&bdev->bd_fsfreeze_mutex);
1276         if (bdev->bd_fsfreeze_count > 0) {
1277                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1278                 error = -EBUSY;
1279                 goto error_bdev;
1280         }
1281         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1282         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1283         error = PTR_ERR(s);
1284         if (IS_ERR(s))
1285                 goto error_bdev;
1286
1287         if (s->s_root)
1288                 blkdev_put(bdev, mode);
1289
1290         memset(&args, 0, sizeof(args));
1291         args.ar_quota = GFS2_QUOTA_DEFAULT;
1292         args.ar_data = GFS2_DATA_DEFAULT;
1293         args.ar_commit = 30;
1294         args.ar_statfs_quantum = 30;
1295         args.ar_quota_quantum = 60;
1296         args.ar_errors = GFS2_ERRORS_DEFAULT;
1297
1298         error = gfs2_mount_args(&args, data);
1299         if (error) {
1300                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1301                 goto error_super;
1302         }
1303
1304         if (s->s_root) {
1305                 error = -EBUSY;
1306                 if ((flags ^ s->s_flags) & MS_RDONLY)
1307                         goto error_super;
1308         } else {
1309                 char b[BDEVNAME_SIZE];
1310
1311                 s->s_flags = flags;
1312                 s->s_mode = mode;
1313                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1314                 sb_set_blocksize(s, block_size(bdev));
1315                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1316                 if (error)
1317                         goto error_super;
1318                 s->s_flags |= MS_ACTIVE;
1319                 bdev->bd_super = s;
1320         }
1321
1322         sdp = s->s_fs_info;
1323         if (args.ar_meta)
1324                 return dget(sdp->sd_master_dir);
1325         else
1326                 return dget(sdp->sd_root_dir);
1327
1328 error_super:
1329         deactivate_locked_super(s);
1330         return ERR_PTR(error);
1331 error_bdev:
1332         blkdev_put(bdev, mode);
1333         return ERR_PTR(error);
1334 }
1335
1336 static int set_meta_super(struct super_block *s, void *ptr)
1337 {
1338         return -EINVAL;
1339 }
1340
1341 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1342                         int flags, const char *dev_name, void *data)
1343 {
1344         struct super_block *s;
1345         struct gfs2_sbd *sdp;
1346         struct path path;
1347         int error;
1348
1349         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1350         if (error) {
1351                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1352                        dev_name, error);
1353                 return ERR_PTR(error);
1354         }
1355         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1356                  path.dentry->d_inode->i_sb->s_bdev);
1357         path_put(&path);
1358         if (IS_ERR(s)) {
1359                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1360                 return ERR_CAST(s);
1361         }
1362         if ((flags ^ s->s_flags) & MS_RDONLY) {
1363                 deactivate_locked_super(s);
1364                 return ERR_PTR(-EBUSY);
1365         }
1366         sdp = s->s_fs_info;
1367         return dget(sdp->sd_master_dir);
1368 }
1369
1370 static void gfs2_kill_sb(struct super_block *sb)
1371 {
1372         struct gfs2_sbd *sdp = sb->s_fs_info;
1373
1374         if (sdp == NULL) {
1375                 kill_block_super(sb);
1376                 return;
1377         }
1378
1379         gfs2_meta_syncfs(sdp);
1380         dput(sdp->sd_root_dir);
1381         dput(sdp->sd_master_dir);
1382         sdp->sd_root_dir = NULL;
1383         sdp->sd_master_dir = NULL;
1384         shrink_dcache_sb(sb);
1385         kill_block_super(sb);
1386         gfs2_delete_debugfs_file(sdp);
1387         kfree(sdp);
1388 }
1389
1390 struct file_system_type gfs2_fs_type = {
1391         .name = "gfs2",
1392         .fs_flags = FS_REQUIRES_DEV,
1393         .mount = gfs2_mount,
1394         .kill_sb = gfs2_kill_sb,
1395         .owner = THIS_MODULE,
1396 };
1397
1398 struct file_system_type gfs2meta_fs_type = {
1399         .name = "gfs2meta",
1400         .fs_flags = FS_REQUIRES_DEV,
1401         .mount = gfs2_mount_meta,
1402         .owner = THIS_MODULE,
1403 };
1404