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 static const u32 gfs2_old_fs_formats[] = {
  42         0
  43 };
  44
  45 static const u32 gfs2_old_multihost_formats[] = {
  46         0
  47 };
  48
  49 /**
  50  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  51  * @gt: tune
  52  *
  53  */
  54
  55 static void gfs2_tune_init(struct gfs2_tune *gt)
  56 {
  57         spin_lock_init(&gt->gt_spin);
  58
  59         gt->gt_quota_simul_sync = 64;
  60         gt->gt_quota_warn_period = 10;
  61         gt->gt_quota_scale_num = 1;
  62         gt->gt_quota_scale_den = 1;
  63         gt->gt_new_files_jdata = 0;
  64         gt->gt_max_readahead = 1 << 18;
  65         gt->gt_complain_secs = 10;
  66 }
  67
  68 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  69 {
  70         struct gfs2_sbd *sdp;
  71
  72         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  73         if (!sdp)
  74                 return NULL;
  75
  76         sb->s_fs_info = sdp;
  77         sdp->sd_vfs = sb;
  78         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  79         gfs2_tune_init(&sdp->sd_tune);
  80
  81         init_waitqueue_head(&sdp->sd_glock_wait);
  82         atomic_set(&sdp->sd_glock_disposal, 0);
  83         spin_lock_init(&sdp->sd_statfs_spin);
  84
  85         spin_lock_init(&sdp->sd_rindex_spin);
  86         mutex_init(&sdp->sd_rindex_mutex);
  87         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  88         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  89
  90         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  91         spin_lock_init(&sdp->sd_jindex_spin);
  92         mutex_init(&sdp->sd_jindex_mutex);
  93
  94         INIT_LIST_HEAD(&sdp->sd_quota_list);
  95         mutex_init(&sdp->sd_quota_mutex);
  96         init_waitqueue_head(&sdp->sd_quota_wait);
  97         INIT_LIST_HEAD(&sdp->sd_trunc_list);
  98         spin_lock_init(&sdp->sd_trunc_lock);
  99
 100         spin_lock_init(&sdp->sd_log_lock);
 101         atomic_set(&sdp->sd_log_pinned, 0);
 102         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 103         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 104         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 105         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 106         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 107
 108         init_waitqueue_head(&sdp->sd_log_waitq);
 109         init_waitqueue_head(&sdp->sd_logd_waitq);
 110         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 111         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 112
 113         init_rwsem(&sdp->sd_log_flush_lock);
 114         atomic_set(&sdp->sd_log_in_flight, 0);
 115         init_waitqueue_head(&sdp->sd_log_flush_wait);
 116
 117         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 118
 119         mutex_init(&sdp->sd_freeze_lock);
 120
 121         return sdp;
 122 }
 123
 124
 125 /**
 126  * gfs2_check_sb - Check superblock
 127  * @sdp: the filesystem
 128  * @sb: The superblock
 129  * @silent: Don't print a message if the check fails
 130  *
 131  * Checks the version code of the FS is one that we understand how to
 132  * read and that the sizes of the various on-disk structures have not
 133  * changed.
 134  */
 135
 136 static int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb_host *sb, int silent)
 137 {
 138         unsigned int x;
 139
 140         if (sb->sb_magic != GFS2_MAGIC ||
 141             sb->sb_type != GFS2_METATYPE_SB) {
 142                 if (!silent)
 143                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 144                 return -EINVAL;
 145         }
 146
 147         /*  If format numbers match exactly, we're done.  */
 148
 149         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 150             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 151                 return 0;
 152
 153         if (sb->sb_fs_format != GFS2_FORMAT_FS) {
 154                 for (x = 0; gfs2_old_fs_formats[x]; x++)
 155                         if (gfs2_old_fs_formats[x] == sb->sb_fs_format)
 156                                 break;
 157
 158                 if (!gfs2_old_fs_formats[x]) {
 159                         printk(KERN_WARNING
 160                                "GFS2: code version (%u, %u) is incompatible "
 161                                "with ondisk format (%u, %u)\n",
 162                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 163                                sb->sb_fs_format, sb->sb_multihost_format);
 164                         printk(KERN_WARNING
 165                                "GFS2: I don't know how to upgrade this FS\n");
 166                         return -EINVAL;
 167                 }
 168         }
 169
 170         if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
 171                 for (x = 0; gfs2_old_multihost_formats[x]; x++)
 172                         if (gfs2_old_multihost_formats[x] ==
 173                             sb->sb_multihost_format)
 174                                 break;
 175
 176                 if (!gfs2_old_multihost_formats[x]) {
 177                         printk(KERN_WARNING
 178                                "GFS2: code version (%u, %u) is incompatible "
 179                                "with ondisk format (%u, %u)\n",
 180                                GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 181                                sb->sb_fs_format, sb->sb_multihost_format);
 182                         printk(KERN_WARNING
 183                                "GFS2: I don't know how to upgrade this FS\n");
 184                         return -EINVAL;
 185                 }
 186         }
 187
 188         if (!sdp->sd_args.ar_upgrade) {
 189                 printk(KERN_WARNING
 190                        "GFS2: code version (%u, %u) is incompatible "
 191                        "with ondisk format (%u, %u)\n",
 192                        GFS2_FORMAT_FS, GFS2_FORMAT_MULTI,
 193                        sb->sb_fs_format, sb->sb_multihost_format);
 194                 printk(KERN_INFO
 195                        "GFS2: Use the \"upgrade\" mount option to upgrade "
 196                        "the FS\n");
 197                 printk(KERN_INFO "GFS2: See the manual for more details\n");
 198                 return -EINVAL;
 199         }
 200
 201         return 0;
 202 }
 203
 204 static void end_bio_io_page(struct bio *bio, int error)
 205 {
 206         struct page *page = bio->bi_private;
 207
 208         if (!error)
 209                 SetPageUptodate(page);
 210         else
 211                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 212         unlock_page(page);
 213 }
 214
 215 static void gfs2_sb_in(struct gfs2_sb_host *sb, const void *buf)
 216 {
 217         const struct gfs2_sb *str = buf;
 218
 219         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 220         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 221         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 222         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 223         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 224         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 225         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 226         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 227         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 228         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 229         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 230
 231         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 232         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 233         memcpy(sb->sb_uuid, str->sb_uuid, 16);
 234 }
 235
 236 /**
 237  * gfs2_read_super - Read the gfs2 super block from disk
 238  * @sdp: The GFS2 super block
 239  * @sector: The location of the super block
 240  * @error: The error code to return
 241  *
 242  * This uses the bio functions to read the super block from disk
 243  * because we want to be 100% sure that we never read cached data.
 244  * A super block is read twice only during each GFS2 mount and is
 245  * never written to by the filesystem. The first time its read no
 246  * locks are held, and the only details which are looked at are those
 247  * relating to the locking protocol. Once locking is up and working,
 248  * the sb is read again under the lock to establish the location of
 249  * the master directory (contains pointers to journals etc) and the
 250  * root directory.
 251  *
 252  * Returns: 0 on success or error
 253  */
 254
 255 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector)
 256 {
 257         struct super_block *sb = sdp->sd_vfs;
 258         struct gfs2_sb *p;
 259         struct page *page;
 260         struct bio *bio;
 261
 262         page = alloc_page(GFP_NOFS);
 263         if (unlikely(!page))
 264                 return -ENOBUFS;
 265
 266         ClearPageUptodate(page);
 267         ClearPageDirty(page);
 268         lock_page(page);
 269
 270         bio = bio_alloc(GFP_NOFS, 1);
 271         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 272         bio->bi_bdev = sb->s_bdev;
 273         bio_add_page(bio, page, PAGE_SIZE, 0);
 274
 275         bio->bi_end_io = end_bio_io_page;
 276         bio->bi_private = page;
 277         submit_bio(READ_SYNC | (1 << BIO_RW_META), bio);
 278         wait_on_page_locked(page);
 279         bio_put(bio);
 280         if (!PageUptodate(page)) {
 281                 __free_page(page);
 282                 return -EIO;
 283         }
 284         p = kmap(page);
 285         gfs2_sb_in(&sdp->sd_sb, p);
 286         kunmap(page);
 287         __free_page(page);
 288         return 0;
 289 }
 290
 291 /**
 292  * gfs2_read_sb - Read super block
 293  * @sdp: The GFS2 superblock
 294  * @silent: Don't print message if mount fails
 295  *
 296  */
 297
 298 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 299 {
 300         u32 hash_blocks, ind_blocks, leaf_blocks;
 301         u32 tmp_blocks;
 302         unsigned int x;
 303         int error;
 304
 305         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 306         if (error) {
 307                 if (!silent)
 308                         fs_err(sdp, "can't read superblock\n");
 309                 return error;
 310         }
 311
 312         error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 313         if (error)
 314                 return error;
 315
 316         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 317                                GFS2_BASIC_BLOCK_SHIFT;
 318         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 319         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 320                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 321         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 322                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 323         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 324         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 325         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 326         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 327         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 328                                 sizeof(struct gfs2_meta_header)) /
 329                                 sizeof(struct gfs2_quota_change);
 330
 331         /* Compute maximum reservation required to add a entry to a directory */
 332
 333         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 334                              sdp->sd_jbsize);
 335
 336         ind_blocks = 0;
 337         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 338                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 339                 ind_blocks += tmp_blocks;
 340         }
 341
 342         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 343
 344         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 345
 346         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 347                                 sizeof(struct gfs2_dinode);
 348         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 349         for (x = 2;; x++) {
 350                 u64 space, d;
 351                 u32 m;
 352
 353                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 354                 d = space;
 355                 m = do_div(d, sdp->sd_inptrs);
 356
 357                 if (d != sdp->sd_heightsize[x - 1] || m)
 358                         break;
 359                 sdp->sd_heightsize[x] = space;
 360         }
 361         sdp->sd_max_height = x;
 362         sdp->sd_heightsize[x] = ~0;
 363         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 364
 365         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 366                                  sizeof(struct gfs2_dinode);
 367         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 368         for (x = 2;; x++) {
 369                 u64 space, d;
 370                 u32 m;
 371
 372                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 373                 d = space;
 374                 m = do_div(d, sdp->sd_inptrs);
 375
 376                 if (d != sdp->sd_jheightsize[x - 1] || m)
 377                         break;
 378                 sdp->sd_jheightsize[x] = space;
 379         }
 380         sdp->sd_max_jheight = x;
 381         sdp->sd_jheightsize[x] = ~0;
 382         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 383
 384         return 0;
 385 }
 386
 387 static int init_names(struct gfs2_sbd *sdp, int silent)
 388 {
 389         char *proto, *table;
 390         int error = 0;
 391
 392         proto = sdp->sd_args.ar_lockproto;
 393         table = sdp->sd_args.ar_locktable;
 394
 395         /*  Try to autodetect  */
 396
 397         if (!proto[0] || !table[0]) {
 398                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 399                 if (error)
 400                         return error;
 401
 402                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 403                 if (error)
 404                         goto out;
 405
 406                 if (!proto[0])
 407                         proto = sdp->sd_sb.sb_lockproto;
 408                 if (!table[0])
 409                         table = sdp->sd_sb.sb_locktable;
 410         }
 411
 412         if (!table[0])
 413                 table = sdp->sd_vfs->s_id;
 414
 415         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 416         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 417
 418         table = sdp->sd_table_name;
 419         while ((table = strchr(table, '/')))
 420                 *table = '_';
 421
 422 out:
 423         return error;
 424 }
 425
 426 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 427                         int undo)
 428 {
 429         int error = 0;
 430
 431         if (undo)
 432                 goto fail_trans;
 433
 434         error = gfs2_glock_nq_num(sdp,
 435                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 436                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 437                                   mount_gh);
 438         if (error) {
 439                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 440                 goto fail;
 441         }
 442
 443         error = gfs2_glock_nq_num(sdp,
 444                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 445                                   LM_ST_SHARED,
 446                                   LM_FLAG_NOEXP | GL_EXACT,
 447                                   &sdp->sd_live_gh);
 448         if (error) {
 449                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 450                 goto fail_mount;
 451         }
 452
 453         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 454                                CREATE, &sdp->sd_rename_gl);
 455         if (error) {
 456                 fs_err(sdp, "can't create rename glock: %d\n", error);
 457                 goto fail_live;
 458         }
 459
 460         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 461                                CREATE, &sdp->sd_trans_gl);
 462         if (error) {
 463                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 464                 goto fail_rename;
 465         }
 466
 467         return 0;
 468
 469 fail_trans:
 470         gfs2_glock_put(sdp->sd_trans_gl);
 471 fail_rename:
 472         gfs2_glock_put(sdp->sd_rename_gl);
 473 fail_live:
 474         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 475 fail_mount:
 476         gfs2_glock_dq_uninit(mount_gh);
 477 fail:
 478         return error;
 479 }
 480
 481 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 482                             u64 no_addr, const char *name)
 483 {
 484         struct gfs2_sbd *sdp = sb->s_fs_info;
 485         struct dentry *dentry;
 486         struct inode *inode;
 487
 488         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
 489         if (IS_ERR(inode)) {
 490                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 491                 return PTR_ERR(inode);
 492         }
 493         dentry = d_alloc_root(inode);
 494         if (!dentry) {
 495                 fs_err(sdp, "can't alloc %s dentry\n", name);
 496                 iput(inode);
 497                 return -ENOMEM;
 498         }
 499         dentry->d_op = &gfs2_dops;
 500         *dptr = dentry;
 501         return 0;
 502 }
 503
 504 static int init_sb(struct gfs2_sbd *sdp, int silent)
 505 {
 506         struct super_block *sb = sdp->sd_vfs;
 507         struct gfs2_holder sb_gh;
 508         u64 no_addr;
 509         int ret;
 510
 511         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 512                                 LM_ST_SHARED, 0, &sb_gh);
 513         if (ret) {
 514                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 515                 return ret;
 516         }
 517
 518         ret = gfs2_read_sb(sdp, silent);
 519         if (ret) {
 520                 fs_err(sdp, "can't read superblock: %d\n", ret);
 521                 goto out;
 522         }
 523
 524         /* Set up the buffer cache and SB for real */
 525         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 526                 ret = -EINVAL;
 527                 fs_err(sdp, "FS block size (%u) is too small for device "
 528                        "block size (%u)\n",
 529                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 530                 goto out;
 531         }
 532         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 533                 ret = -EINVAL;
 534                 fs_err(sdp, "FS block size (%u) is too big for machine "
 535                        "page size (%u)\n",
 536                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 537                 goto out;
 538         }
 539         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 540
 541         /* Get the root inode */
 542         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 543         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 544         if (ret)
 545                 goto out;
 546
 547         /* Get the master inode */
 548         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 549         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 550         if (ret) {
 551                 dput(sdp->sd_root_dir);
 552                 goto out;
 553         }
 554         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 555 out:
 556         gfs2_glock_dq_uninit(&sb_gh);
 557         return ret;
 558 }
 559
 560 /**
 561  * map_journal_extents - create a reusable "extent" mapping from all logical
 562  * blocks to all physical blocks for the given journal.  This will save
 563  * us time when writing journal blocks.  Most journals will have only one
 564  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 565  * arranges the journal blocks sequentially to maximize performance.
 566  * So the extent would map the first block for the entire file length.
 567  * However, gfs2_jadd can happen while file activity is happening, so
 568  * those journals may not be sequential.  Less likely is the case where
 569  * the users created their own journals by mounting the metafs and
 570  * laying it out.  But it's still possible.  These journals might have
 571  * several extents.
 572  *
 573  * TODO: This should be done in bigger chunks rather than one block at a time,
 574  *       but since it's only done at mount time, I'm not worried about the
 575  *       time it takes.
 576  */
 577 static int map_journal_extents(struct gfs2_sbd *sdp)
 578 {
 579         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 580         unsigned int lb;
 581         u64 db, prev_db; /* logical block, disk block, prev disk block */
 582         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 583         struct gfs2_journal_extent *jext = NULL;
 584         struct buffer_head bh;
 585         int rc = 0;
 586
 587         prev_db = 0;
 588
 589         for (lb = 0; lb < ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; lb++) {
 590                 bh.b_state = 0;
 591                 bh.b_blocknr = 0;
 592                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 593                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 594                 db = bh.b_blocknr;
 595                 if (rc || !db) {
 596                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 597                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 598                         break;
 599                 }
 600                 if (!prev_db || db != prev_db + 1) {
 601                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 602                                        GFP_KERNEL);
 603                         if (!jext) {
 604                                 printk(KERN_INFO "GFS2 error: out of memory "
 605                                        "mapping journal extents.\n");
 606                                 rc = -ENOMEM;
 607                                 break;
 608                         }
 609                         jext->dblock = db;
 610                         jext->lblock = lb;
 611                         jext->blocks = 1;
 612                         list_add_tail(&jext->extent_list, &jd->extent_list);
 613                 } else {
 614                         jext->blocks++;
 615                 }
 616                 prev_db = db;
 617         }
 618         return rc;
 619 }
 620
 621 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 622 {
 623         char *message = "FIRSTMOUNT=Done";
 624         char *envp[] = { message, NULL };
 625         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 626         ls->ls_first_done = 1;
 627         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 628 }
 629
 630 /**
 631  * gfs2_jindex_hold - Grab a lock on the jindex
 632  * @sdp: The GFS2 superblock
 633  * @ji_gh: the holder for the jindex glock
 634  *
 635  * Returns: errno
 636  */
 637
 638 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 639 {
 640         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 641         struct qstr name;
 642         char buf[20];
 643         struct gfs2_jdesc *jd;
 644         int error;
 645
 646         name.name = buf;
 647
 648         mutex_lock(&sdp->sd_jindex_mutex);
 649
 650         for (;;) {
 651                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 652                 if (error)
 653                         break;
 654
 655                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 656                 name.hash = gfs2_disk_hash(name.name, name.len);
 657
 658                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 659                 if (error == -ENOENT) {
 660                         error = 0;
 661                         break;
 662                 }
 663
 664                 gfs2_glock_dq_uninit(ji_gh);
 665
 666                 if (error)
 667                         break;
 668
 669                 error = -ENOMEM;
 670                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 671                 if (!jd)
 672                         break;
 673
 674                 INIT_LIST_HEAD(&jd->extent_list);
 675                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 676                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 677                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 678                         if (!jd->jd_inode)
 679                                 error = -ENOENT;
 680                         else
 681                                 error = PTR_ERR(jd->jd_inode);
 682                         kfree(jd);
 683                         break;
 684                 }
 685
 686                 spin_lock(&sdp->sd_jindex_spin);
 687                 jd->jd_jid = sdp->sd_journals++;
 688                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 689                 spin_unlock(&sdp->sd_jindex_spin);
 690         }
 691
 692         mutex_unlock(&sdp->sd_jindex_mutex);
 693
 694         return error;
 695 }
 696
 697 static int init_journal(struct gfs2_sbd *sdp, int undo)
 698 {
 699         struct inode *master = sdp->sd_master_dir->d_inode;
 700         struct gfs2_holder ji_gh;
 701         struct gfs2_inode *ip;
 702         int jindex = 1;
 703         int error = 0;
 704
 705         if (undo) {
 706                 jindex = 0;
 707                 goto fail_jinode_gh;
 708         }
 709
 710         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 711         if (IS_ERR(sdp->sd_jindex)) {
 712                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 713                 return PTR_ERR(sdp->sd_jindex);
 714         }
 715         ip = GFS2_I(sdp->sd_jindex);
 716
 717         /* Load in the journal index special file */
 718
 719         error = gfs2_jindex_hold(sdp, &ji_gh);
 720         if (error) {
 721                 fs_err(sdp, "can't read journal index: %d\n", error);
 722                 goto fail;
 723         }
 724
 725         error = -EUSERS;
 726         if (!gfs2_jindex_size(sdp)) {
 727                 fs_err(sdp, "no journals!\n");
 728                 goto fail_jindex;
 729         }
 730
 731         if (sdp->sd_args.ar_spectator) {
 732                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 733                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 734                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 735                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 736         } else {
 737                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 738                         fs_err(sdp, "can't mount journal #%u\n",
 739                                sdp->sd_lockstruct.ls_jid);
 740                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 741                                gfs2_jindex_size(sdp),
 742                                gfs2_jindex_size(sdp) - 1);
 743                         goto fail_jindex;
 744                 }
 745                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 746
 747                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 748                                           &gfs2_journal_glops,
 749                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 750                                           &sdp->sd_journal_gh);
 751                 if (error) {
 752                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 753                         goto fail_jindex;
 754                 }
 755
 756                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 757                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 758                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 759                                            &sdp->sd_jinode_gh);
 760                 if (error) {
 761                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 762                                error);
 763                         goto fail_journal_gh;
 764                 }
 765
 766                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 767                 if (error) {
 768                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 769                                sdp->sd_jdesc->jd_jid, error);
 770                         goto fail_jinode_gh;
 771                 }
 772                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 773                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 774                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 775
 776                 /* Map the extents for this journal's blocks */
 777                 map_journal_extents(sdp);
 778         }
 779         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 780
 781         if (sdp->sd_lockstruct.ls_first) {
 782                 unsigned int x;
 783                 for (x = 0; x < sdp->sd_journals; x++) {
 784                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
 785                                                      true);
 786                         if (error) {
 787                                 fs_err(sdp, "error recovering journal %u: %d\n",
 788                                        x, error);
 789                                 goto fail_jinode_gh;
 790                         }
 791                 }
 792
 793                 gfs2_others_may_mount(sdp);
 794         } else if (!sdp->sd_args.ar_spectator) {
 795                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 796                 if (error) {
 797                         fs_err(sdp, "error recovering my journal: %d\n", error);
 798                         goto fail_jinode_gh;
 799                 }
 800         }
 801
 802         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 803         gfs2_glock_dq_uninit(&ji_gh);
 804         jindex = 0;
 805
 806         return 0;
 807
 808 fail_jinode_gh:
 809         if (!sdp->sd_args.ar_spectator)
 810                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 811 fail_journal_gh:
 812         if (!sdp->sd_args.ar_spectator)
 813                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 814 fail_jindex:
 815         gfs2_jindex_free(sdp);
 816         if (jindex)
 817                 gfs2_glock_dq_uninit(&ji_gh);
 818 fail:
 819         iput(sdp->sd_jindex);
 820         return error;
 821 }
 822
 823
 824 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 825 {
 826         int error = 0;
 827         struct gfs2_inode *ip;
 828         struct inode *master = sdp->sd_master_dir->d_inode;
 829
 830         if (undo)
 831                 goto fail_qinode;
 832
 833         error = init_journal(sdp, undo);
 834         if (error)
 835                 goto fail;
 836
 837         /* Read in the master statfs inode */
 838         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 839         if (IS_ERR(sdp->sd_statfs_inode)) {
 840                 error = PTR_ERR(sdp->sd_statfs_inode);
 841                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 842                 goto fail_journal;
 843         }
 844
 845         /* Read in the resource index inode */
 846         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 847         if (IS_ERR(sdp->sd_rindex)) {
 848                 error = PTR_ERR(sdp->sd_rindex);
 849                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 850                 goto fail_statfs;
 851         }
 852         ip = GFS2_I(sdp->sd_rindex);
 853         sdp->sd_rindex_uptodate = 0;
 854
 855         /* Read in the quota inode */
 856         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 857         if (IS_ERR(sdp->sd_quota_inode)) {
 858                 error = PTR_ERR(sdp->sd_quota_inode);
 859                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 860                 goto fail_rindex;
 861         }
 862         return 0;
 863
 864 fail_qinode:
 865         iput(sdp->sd_quota_inode);
 866 fail_rindex:
 867         gfs2_clear_rgrpd(sdp);
 868         iput(sdp->sd_rindex);
 869 fail_statfs:
 870         iput(sdp->sd_statfs_inode);
 871 fail_journal:
 872         init_journal(sdp, UNDO);
 873 fail:
 874         return error;
 875 }
 876
 877 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 878 {
 879         struct inode *pn = NULL;
 880         char buf[30];
 881         int error = 0;
 882         struct gfs2_inode *ip;
 883         struct inode *master = sdp->sd_master_dir->d_inode;
 884
 885         if (sdp->sd_args.ar_spectator)
 886                 return 0;
 887
 888         if (undo)
 889                 goto fail_qc_gh;
 890
 891         pn = gfs2_lookup_simple(master, "per_node");
 892         if (IS_ERR(pn)) {
 893                 error = PTR_ERR(pn);
 894                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 895                 return error;
 896         }
 897
 898         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 899         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 900         if (IS_ERR(sdp->sd_sc_inode)) {
 901                 error = PTR_ERR(sdp->sd_sc_inode);
 902                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 903                 goto fail;
 904         }
 905
 906         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 907         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 908         if (IS_ERR(sdp->sd_qc_inode)) {
 909                 error = PTR_ERR(sdp->sd_qc_inode);
 910                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 911                 goto fail_ut_i;
 912         }
 913
 914         iput(pn);
 915         pn = NULL;
 916
 917         ip = GFS2_I(sdp->sd_sc_inode);
 918         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 919                                    &sdp->sd_sc_gh);
 920         if (error) {
 921                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 922                 goto fail_qc_i;
 923         }
 924
 925         ip = GFS2_I(sdp->sd_qc_inode);
 926         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 927                                    &sdp->sd_qc_gh);
 928         if (error) {
 929                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 930                 goto fail_ut_gh;
 931         }
 932
 933         return 0;
 934
 935 fail_qc_gh:
 936         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 937 fail_ut_gh:
 938         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 939 fail_qc_i:
 940         iput(sdp->sd_qc_inode);
 941 fail_ut_i:
 942         iput(sdp->sd_sc_inode);
 943 fail:
 944         if (pn)
 945                 iput(pn);
 946         return error;
 947 }
 948
 949 static int init_threads(struct gfs2_sbd *sdp, int undo)
 950 {
 951         struct task_struct *p;
 952         int error = 0;
 953
 954         if (undo)
 955                 goto fail_quotad;
 956
 957         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 958         error = IS_ERR(p);
 959         if (error) {
 960                 fs_err(sdp, "can't start logd thread: %d\n", error);
 961                 return error;
 962         }
 963         sdp->sd_logd_process = p;
 964
 965         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 966         error = IS_ERR(p);
 967         if (error) {
 968                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 969                 goto fail;
 970         }
 971         sdp->sd_quotad_process = p;
 972
 973         return 0;
 974
 975
 976 fail_quotad:
 977         kthread_stop(sdp->sd_quotad_process);
 978 fail:
 979         kthread_stop(sdp->sd_logd_process);
 980         return error;
 981 }
 982
 983 static const match_table_t nolock_tokens = {
 984         { Opt_jid, "jid=%d\n", },
 985         { Opt_err, NULL },
 986 };
 987
 988 static void nolock_put_lock(struct kmem_cache *cachep, struct gfs2_glock *gl)
 989 {
 990         struct gfs2_sbd *sdp = gl->gl_sbd;
 991         kmem_cache_free(cachep, gl);
 992         if (atomic_dec_and_test(&sdp->sd_glock_disposal))
 993                 wake_up(&sdp->sd_glock_wait);
 994 }
 995
 996 static const struct lm_lockops nolock_ops = {
 997         .lm_proto_name = "lock_nolock",
 998         .lm_put_lock = nolock_put_lock,
 999         .lm_tokens = &nolock_tokens,
1000 };
1001
1002 /**
1003  * gfs2_lm_mount - mount a locking protocol
1004  * @sdp: the filesystem
1005  * @args: mount arguments
1006  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1007  *
1008  * Returns: errno
1009  */
1010
1011 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1012 {
1013         const struct lm_lockops *lm;
1014         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1015         struct gfs2_args *args = &sdp->sd_args;
1016         const char *proto = sdp->sd_proto_name;
1017         const char *table = sdp->sd_table_name;
1018         const char *fsname;
1019         char *o, *options;
1020         int ret;
1021
1022         if (!strcmp("lock_nolock", proto)) {
1023                 lm = &nolock_ops;
1024                 sdp->sd_args.ar_localflocks = 1;
1025                 sdp->sd_args.ar_localcaching = 1;
1026 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1027         } else if (!strcmp("lock_dlm", proto)) {
1028                 lm = &gfs2_dlm_ops;
1029 #endif
1030         } else {
1031                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1032                 return -ENOENT;
1033         }
1034
1035         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1036
1037         ls->ls_ops = lm;
1038         ls->ls_first = 1;
1039
1040         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1041                 substring_t tmp[MAX_OPT_ARGS];
1042                 int token, option;
1043
1044                 if (!o || !*o)
1045                         continue;
1046
1047                 token = match_token(o, *lm->lm_tokens, tmp);
1048                 switch (token) {
1049                 case Opt_jid:
1050                         ret = match_int(&tmp[0], &option);
1051                         if (ret || option < 0)
1052                                 goto hostdata_error;
1053                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1054                                 ls->ls_jid = option;
1055                         break;
1056                 case Opt_id:
1057                         /* Obsolete, but left for backward compat purposes */
1058                         break;
1059                 case Opt_first:
1060                         ret = match_int(&tmp[0], &option);
1061                         if (ret || (option != 0 && option != 1))
1062                                 goto hostdata_error;
1063                         ls->ls_first = option;
1064                         break;
1065                 case Opt_nodir:
1066                         ret = match_int(&tmp[0], &option);
1067                         if (ret || (option != 0 && option != 1))
1068                                 goto hostdata_error;
1069                         ls->ls_nodir = option;
1070                         break;
1071                 case Opt_err:
1072                 default:
1073 hostdata_error:
1074                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1075                         return -EINVAL;
1076                 }
1077         }
1078
1079         if (sdp->sd_args.ar_spectator)
1080                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
1081         else
1082                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
1083                          sdp->sd_lockstruct.ls_jid);
1084
1085         fsname = strchr(table, ':');
1086         if (fsname)
1087                 fsname++;
1088         if (lm->lm_mount == NULL) {
1089                 fs_info(sdp, "Now mounting FS...\n");
1090                 return 0;
1091         }
1092         ret = lm->lm_mount(sdp, fsname);
1093         if (ret == 0)
1094                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1095         return ret;
1096 }
1097
1098 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1099 {
1100         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1101         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1102             lm->lm_unmount)
1103                 lm->lm_unmount(sdp);
1104 }
1105
1106 static int gfs2_journalid_wait(void *word)
1107 {
1108         if (signal_pending(current))
1109                 return -EINTR;
1110         schedule();
1111         return 0;
1112 }
1113
1114 static int wait_on_journal(struct gfs2_sbd *sdp)
1115 {
1116         if (sdp->sd_args.ar_spectator)
1117                 return 0;
1118         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1119                 return 0;
1120
1121         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1122 }
1123
1124 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1125 {
1126         struct super_block *sb = sdp->sd_vfs;
1127         char ro[20];
1128         char spectator[20];
1129         char *envp[] = { ro, spectator, NULL };
1130         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1131         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1132         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1133 }
1134
1135 /**
1136  * fill_super - Read in superblock
1137  * @sb: The VFS superblock
1138  * @data: Mount options
1139  * @silent: Don't complain if it's not a GFS2 filesystem
1140  *
1141  * Returns: errno
1142  */
1143
1144 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1145 {
1146         struct gfs2_sbd *sdp;
1147         struct gfs2_holder mount_gh;
1148         int error;
1149
1150         sdp = init_sbd(sb);
1151         if (!sdp) {
1152                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1153                 return -ENOMEM;
1154         }
1155         sdp->sd_args = *args;
1156
1157         if (sdp->sd_args.ar_spectator) {
1158                 sb->s_flags |= MS_RDONLY;
1159                 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
1160         }
1161         if (sdp->sd_args.ar_posix_acl)
1162                 sb->s_flags |= MS_POSIXACL;
1163         if (sdp->sd_args.ar_nobarrier)
1164                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1165
1166         sb->s_magic = GFS2_MAGIC;
1167         sb->s_op = &gfs2_super_ops;
1168         sb->s_export_op = &gfs2_export_ops;
1169         sb->s_xattr = gfs2_xattr_handlers;
1170         sb->s_qcop = &gfs2_quotactl_ops;
1171         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1172         sb->s_time_gran = 1;
1173         sb->s_maxbytes = MAX_LFS_FILESIZE;
1174
1175         /* Set up the buffer cache and fill in some fake block size values
1176            to allow us to read-in the on-disk superblock. */
1177         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1178         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1179         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1180                                GFS2_BASIC_BLOCK_SHIFT;
1181         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1182
1183         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1184         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1185         if (sdp->sd_args.ar_statfs_quantum) {
1186                 sdp->sd_tune.gt_statfs_slow = 0;
1187                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1188         }
1189         else {
1190                 sdp->sd_tune.gt_statfs_slow = 1;
1191                 sdp->sd_tune.gt_statfs_quantum = 30;
1192         }
1193
1194         error = init_names(sdp, silent);
1195         if (error)
1196                 goto fail;
1197
1198         gfs2_create_debugfs_file(sdp);
1199
1200         error = gfs2_sys_fs_add(sdp);
1201         if (error)
1202                 goto fail;
1203
1204         error = gfs2_lm_mount(sdp, silent);
1205         if (error)
1206                 goto fail_sys;
1207
1208         error = init_locking(sdp, &mount_gh, DO);
1209         if (error)
1210                 goto fail_lm;
1211
1212         error = init_sb(sdp, silent);
1213         if (error)
1214                 goto fail_locking;
1215
1216         error = wait_on_journal(sdp);
1217         if (error)
1218                 goto fail_sb;
1219
1220         error = init_inodes(sdp, DO);
1221         if (error)
1222                 goto fail_sb;
1223
1224         error = init_per_node(sdp, DO);
1225         if (error)
1226                 goto fail_inodes;
1227
1228         error = gfs2_statfs_init(sdp);
1229         if (error) {
1230                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1231                 goto fail_per_node;
1232         }
1233
1234         error = init_threads(sdp, DO);
1235         if (error)
1236                 goto fail_per_node;
1237
1238         if (!(sb->s_flags & MS_RDONLY)) {
1239                 error = gfs2_make_fs_rw(sdp);
1240                 if (error) {
1241                         fs_err(sdp, "can't make FS RW: %d\n", error);
1242                         goto fail_threads;
1243                 }
1244         }
1245
1246         gfs2_glock_dq_uninit(&mount_gh);
1247         gfs2_online_uevent(sdp);
1248         return 0;
1249
1250 fail_threads:
1251         init_threads(sdp, UNDO);
1252 fail_per_node:
1253         init_per_node(sdp, UNDO);
1254 fail_inodes:
1255         init_inodes(sdp, UNDO);
1256 fail_sb:
1257         if (sdp->sd_root_dir)
1258                 dput(sdp->sd_root_dir);
1259         if (sdp->sd_master_dir)
1260                 dput(sdp->sd_master_dir);
1261         if (sb->s_root)
1262                 dput(sb->s_root);
1263         sb->s_root = NULL;
1264 fail_locking:
1265         init_locking(sdp, &mount_gh, UNDO);
1266 fail_lm:
1267         invalidate_inodes(sb);
1268         gfs2_gl_hash_clear(sdp);
1269         gfs2_lm_unmount(sdp);
1270 fail_sys:
1271         gfs2_sys_fs_del(sdp);
1272 fail:
1273         gfs2_delete_debugfs_file(sdp);
1274         kfree(sdp);
1275         sb->s_fs_info = NULL;
1276         return error;
1277 }
1278
1279 static int set_gfs2_super(struct super_block *s, void *data)
1280 {
1281         s->s_bdev = data;
1282         s->s_dev = s->s_bdev->bd_dev;
1283
1284         /*
1285          * We set the bdi here to the queue backing, file systems can
1286          * overwrite this in ->fill_super()
1287          */
1288         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1289         return 0;
1290 }
1291
1292 static int test_gfs2_super(struct super_block *s, void *ptr)
1293 {
1294         struct block_device *bdev = ptr;
1295         return (bdev == s->s_bdev);
1296 }
1297
1298 /**
1299  * gfs2_get_sb - Get the GFS2 superblock
1300  * @fs_type: The GFS2 filesystem type
1301  * @flags: Mount flags
1302  * @dev_name: The name of the device
1303  * @data: The mount arguments
1304  * @mnt: The vfsmnt for this mount
1305  *
1306  * Q. Why not use get_sb_bdev() ?
1307  * A. We need to select one of two root directories to mount, independent
1308  *    of whether this is the initial, or subsequent, mount of this sb
1309  *
1310  * Returns: 0 or -ve on error
1311  */
1312
1313 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
1314                        const char *dev_name, void *data, struct vfsmount *mnt)
1315 {
1316         struct block_device *bdev;
1317         struct super_block *s;
1318         fmode_t mode = FMODE_READ;
1319         int error;
1320         struct gfs2_args args;
1321         struct gfs2_sbd *sdp;
1322
1323         if (!(flags & MS_RDONLY))
1324                 mode |= FMODE_WRITE;
1325
1326         bdev = open_bdev_exclusive(dev_name, mode, fs_type);
1327         if (IS_ERR(bdev))
1328                 return PTR_ERR(bdev);
1329
1330         /*
1331          * once the super is inserted into the list by sget, s_umount
1332          * will protect the lockfs code from trying to start a snapshot
1333          * while we are mounting
1334          */
1335         mutex_lock(&bdev->bd_fsfreeze_mutex);
1336         if (bdev->bd_fsfreeze_count > 0) {
1337                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1338                 error = -EBUSY;
1339                 goto error_bdev;
1340         }
1341         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1342         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1343         error = PTR_ERR(s);
1344         if (IS_ERR(s))
1345                 goto error_bdev;
1346
1347         memset(&args, 0, sizeof(args));
1348         args.ar_quota = GFS2_QUOTA_DEFAULT;
1349         args.ar_data = GFS2_DATA_DEFAULT;
1350         args.ar_commit = 30;
1351         args.ar_statfs_quantum = 30;
1352         args.ar_quota_quantum = 60;
1353         args.ar_errors = GFS2_ERRORS_DEFAULT;
1354
1355         error = gfs2_mount_args(&args, data);
1356         if (error) {
1357                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1358                 if (s->s_root)
1359                         goto error_super;
1360                 deactivate_locked_super(s);
1361                 return error;
1362         }
1363
1364         if (s->s_root) {
1365                 error = -EBUSY;
1366                 if ((flags ^ s->s_flags) & MS_RDONLY)
1367                         goto error_super;
1368                 close_bdev_exclusive(bdev, mode);
1369         } else {
1370                 char b[BDEVNAME_SIZE];
1371
1372                 s->s_flags = flags;
1373                 s->s_mode = mode;
1374                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1375                 sb_set_blocksize(s, block_size(bdev));
1376                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1377                 if (error) {
1378                         deactivate_locked_super(s);
1379                         return error;
1380                 }
1381                 s->s_flags |= MS_ACTIVE;
1382                 bdev->bd_super = s;
1383         }
1384
1385         sdp = s->s_fs_info;
1386         mnt->mnt_sb = s;
1387         if (args.ar_meta)
1388                 mnt->mnt_root = dget(sdp->sd_master_dir);
1389         else
1390                 mnt->mnt_root = dget(sdp->sd_root_dir);
1391         return 0;
1392
1393 error_super:
1394         deactivate_locked_super(s);
1395 error_bdev:
1396         close_bdev_exclusive(bdev, mode);
1397         return error;
1398 }
1399
1400 static int set_meta_super(struct super_block *s, void *ptr)
1401 {
1402         return -EINVAL;
1403 }
1404
1405 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
1406                             const char *dev_name, void *data, struct vfsmount *mnt)
1407 {
1408         struct super_block *s;
1409         struct gfs2_sbd *sdp;
1410         struct path path;
1411         int error;
1412
1413         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1414         if (error) {
1415                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1416                        dev_name, error);
1417                 return error;
1418         }
1419         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1420                  path.dentry->d_inode->i_sb->s_bdev);
1421         path_put(&path);
1422         if (IS_ERR(s)) {
1423                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1424                 return PTR_ERR(s);
1425         }
1426         if ((flags ^ s->s_flags) & MS_RDONLY) {
1427                 deactivate_locked_super(s);
1428                 return -EBUSY;
1429         }
1430         sdp = s->s_fs_info;
1431         mnt->mnt_sb = s;
1432         mnt->mnt_root = dget(sdp->sd_master_dir);
1433         return 0;
1434 }
1435
1436 static void gfs2_kill_sb(struct super_block *sb)
1437 {
1438         struct gfs2_sbd *sdp = sb->s_fs_info;
1439
1440         if (sdp == NULL) {
1441                 kill_block_super(sb);
1442                 return;
1443         }
1444
1445         gfs2_meta_syncfs(sdp);
1446         dput(sdp->sd_root_dir);
1447         dput(sdp->sd_master_dir);
1448         sdp->sd_root_dir = NULL;
1449         sdp->sd_master_dir = NULL;
1450         shrink_dcache_sb(sb);
1451         kill_block_super(sb);
1452         gfs2_delete_debugfs_file(sdp);
1453         kfree(sdp);
1454 }
1455
1456 struct file_system_type gfs2_fs_type = {
1457         .name = "gfs2",
1458         .fs_flags = FS_REQUIRES_DEV,
1459         .get_sb = gfs2_get_sb,
1460         .kill_sb = gfs2_kill_sb,
1461         .owner = THIS_MODULE,
1462 };
1463
1464 struct file_system_type gfs2meta_fs_type = {
1465         .name = "gfs2meta",
1466         .fs_flags = FS_REQUIRES_DEV,
1467         .get_sb = gfs2_get_sb_meta,
1468         .owner = THIS_MODULE,
1469 };
1470