fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/export.h>
  18 #include <linux/namei.h>
  19 #include <linux/mount.h>
  20 #include <linux/gfs2_ondisk.h>
  21 #include <linux/quotaops.h>
  22
  23 #include "gfs2.h"
  24 #include "incore.h"
  25 #include "bmap.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.h"
  29 #include "recovery.h"
  30 #include "rgrp.h"
  31 #include "super.h"
  32 #include "sys.h"
  33 #include "util.h"
  34 #include "log.h"
  35 #include "quota.h"
  36 #include "dir.h"
  37 #include "trace_gfs2.h"
  38
  39 #define DO 0
  40 #define UNDO 1
  41
  42 /**
  43  * gfs2_tune_init - Fill a gfs2_tune structure with default values
  44  * @gt: tune
  45  *
  46  */
  47
  48 static void gfs2_tune_init(struct gfs2_tune *gt)
  49 {
  50         spin_lock_init(&gt->gt_spin);
  51
  52         gt->gt_quota_simul_sync = 64;
  53         gt->gt_quota_warn_period = 10;
  54         gt->gt_quota_scale_num = 1;
  55         gt->gt_quota_scale_den = 1;
  56         gt->gt_new_files_jdata = 0;
  57         gt->gt_max_readahead = 1 << 18;
  58         gt->gt_complain_secs = 10;
  59 }
  60
  61 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  62 {
  63         struct gfs2_sbd *sdp;
  64
  65         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  66         if (!sdp)
  67                 return NULL;
  68
  69         sb->s_fs_info = sdp;
  70         sdp->sd_vfs = sb;
  71         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
  72         if (!sdp->sd_lkstats) {
  73                 kfree(sdp);
  74                 return NULL;
  75         }
  76
  77         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
  78         gfs2_tune_init(&sdp->sd_tune);
  79
  80         init_waitqueue_head(&sdp->sd_glock_wait);
  81         atomic_set(&sdp->sd_glock_disposal, 0);
  82         init_completion(&sdp->sd_locking_init);
  83         spin_lock_init(&sdp->sd_statfs_spin);
  84
  85         spin_lock_init(&sdp->sd_rindex_spin);
  86         sdp->sd_rindex_tree.rb_node = NULL;
  87
  88         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  89         spin_lock_init(&sdp->sd_jindex_spin);
  90         mutex_init(&sdp->sd_jindex_mutex);
  91
  92         INIT_LIST_HEAD(&sdp->sd_quota_list);
  93         mutex_init(&sdp->sd_quota_mutex);
  94         init_waitqueue_head(&sdp->sd_quota_wait);
  95         INIT_LIST_HEAD(&sdp->sd_trunc_list);
  96         spin_lock_init(&sdp->sd_trunc_lock);
  97
  98         spin_lock_init(&sdp->sd_log_lock);
  99         atomic_set(&sdp->sd_log_pinned, 0);
 100         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
 101         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
 102         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
 103         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
 104         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
 105
 106         init_waitqueue_head(&sdp->sd_log_waitq);
 107         init_waitqueue_head(&sdp->sd_logd_waitq);
 108         spin_lock_init(&sdp->sd_ail_lock);
 109         INIT_LIST_HEAD(&sdp->sd_ail1_list);
 110         INIT_LIST_HEAD(&sdp->sd_ail2_list);
 111
 112         init_rwsem(&sdp->sd_log_flush_lock);
 113         atomic_set(&sdp->sd_log_in_flight, 0);
 114         init_waitqueue_head(&sdp->sd_log_flush_wait);
 115
 116         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 117
 118         mutex_init(&sdp->sd_freeze_lock);
 119
 120         return sdp;
 121 }
 122
 123
 124 /**
 125  * gfs2_check_sb - Check superblock
 126  * @sdp: the filesystem
 127  * @sb: The superblock
 128  * @silent: Don't print a message if the check fails
 129  *
 130  * Checks the version code of the FS is one that we understand how to
 131  * read and that the sizes of the various on-disk structures have not
 132  * changed.
 133  */
 134
 135 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
 136 {
 137         struct gfs2_sb_host *sb = &sdp->sd_sb;
 138
 139         if (sb->sb_magic != GFS2_MAGIC ||
 140             sb->sb_type != GFS2_METATYPE_SB) {
 141                 if (!silent)
 142                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
 143                 return -EINVAL;
 144         }
 145
 146         /*  If format numbers match exactly, we're done.  */
 147
 148         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
 149             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
 150                 return 0;
 151
 152         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
 153
 154         return -EINVAL;
 155 }
 156
 157 static void end_bio_io_page(struct bio *bio, int error)
 158 {
 159         struct page *page = bio->bi_private;
 160
 161         if (!error)
 162                 SetPageUptodate(page);
 163         else
 164                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
 165         unlock_page(page);
 166 }
 167
 168 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
 169 {
 170         struct gfs2_sb_host *sb = &sdp->sd_sb;
 171         struct super_block *s = sdp->sd_vfs;
 172         const struct gfs2_sb *str = buf;
 173
 174         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
 175         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
 176         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
 177         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
 178         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
 179         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
 180         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
 181         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
 182         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
 183         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
 184         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
 185
 186         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
 187         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
 188         memcpy(s->s_uuid, str->sb_uuid, 16);
 189 }
 190
 191 /**
 192  * gfs2_read_super - Read the gfs2 super block from disk
 193  * @sdp: The GFS2 super block
 194  * @sector: The location of the super block
 195  * @error: The error code to return
 196  *
 197  * This uses the bio functions to read the super block from disk
 198  * because we want to be 100% sure that we never read cached data.
 199  * A super block is read twice only during each GFS2 mount and is
 200  * never written to by the filesystem. The first time its read no
 201  * locks are held, and the only details which are looked at are those
 202  * relating to the locking protocol. Once locking is up and working,
 203  * the sb is read again under the lock to establish the location of
 204  * the master directory (contains pointers to journals etc) and the
 205  * root directory.
 206  *
 207  * Returns: 0 on success or error
 208  */
 209
 210 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
 211 {
 212         struct super_block *sb = sdp->sd_vfs;
 213         struct gfs2_sb *p;
 214         struct page *page;
 215         struct bio *bio;
 216
 217         page = alloc_page(GFP_NOFS);
 218         if (unlikely(!page))
 219                 return -ENOBUFS;
 220
 221         ClearPageUptodate(page);
 222         ClearPageDirty(page);
 223         lock_page(page);
 224
 225         bio = bio_alloc(GFP_NOFS, 1);
 226         bio->bi_sector = sector * (sb->s_blocksize >> 9);
 227         bio->bi_bdev = sb->s_bdev;
 228         bio_add_page(bio, page, PAGE_SIZE, 0);
 229
 230         bio->bi_end_io = end_bio_io_page;
 231         bio->bi_private = page;
 232         submit_bio(READ_SYNC | REQ_META, bio);
 233         wait_on_page_locked(page);
 234         bio_put(bio);
 235         if (!PageUptodate(page)) {
 236                 __free_page(page);
 237                 return -EIO;
 238         }
 239         p = kmap(page);
 240         gfs2_sb_in(sdp, p);
 241         kunmap(page);
 242         __free_page(page);
 243         return gfs2_check_sb(sdp, silent);
 244 }
 245
 246 /**
 247  * gfs2_read_sb - Read super block
 248  * @sdp: The GFS2 superblock
 249  * @silent: Don't print message if mount fails
 250  *
 251  */
 252
 253 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
 254 {
 255         u32 hash_blocks, ind_blocks, leaf_blocks;
 256         u32 tmp_blocks;
 257         unsigned int x;
 258         int error;
 259
 260         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 261         if (error) {
 262                 if (!silent)
 263                         fs_err(sdp, "can't read superblock\n");
 264                 return error;
 265         }
 266
 267         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 268                                GFS2_BASIC_BLOCK_SHIFT;
 269         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 270         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
 271                           sizeof(struct gfs2_dinode)) / sizeof(u64);
 272         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
 273                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
 274         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
 275         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
 276         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
 277         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
 278         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
 279                                 sizeof(struct gfs2_meta_header)) /
 280                                 sizeof(struct gfs2_quota_change);
 281
 282         /* Compute maximum reservation required to add a entry to a directory */
 283
 284         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
 285                              sdp->sd_jbsize);
 286
 287         ind_blocks = 0;
 288         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
 289                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
 290                 ind_blocks += tmp_blocks;
 291         }
 292
 293         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
 294
 295         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
 296
 297         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
 298                                 sizeof(struct gfs2_dinode);
 299         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
 300         for (x = 2;; x++) {
 301                 u64 space, d;
 302                 u32 m;
 303
 304                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
 305                 d = space;
 306                 m = do_div(d, sdp->sd_inptrs);
 307
 308                 if (d != sdp->sd_heightsize[x - 1] || m)
 309                         break;
 310                 sdp->sd_heightsize[x] = space;
 311         }
 312         sdp->sd_max_height = x;
 313         sdp->sd_heightsize[x] = ~0;
 314         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
 315
 316         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
 317                                  sizeof(struct gfs2_dinode);
 318         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
 319         for (x = 2;; x++) {
 320                 u64 space, d;
 321                 u32 m;
 322
 323                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
 324                 d = space;
 325                 m = do_div(d, sdp->sd_inptrs);
 326
 327                 if (d != sdp->sd_jheightsize[x - 1] || m)
 328                         break;
 329                 sdp->sd_jheightsize[x] = space;
 330         }
 331         sdp->sd_max_jheight = x;
 332         sdp->sd_jheightsize[x] = ~0;
 333         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
 334
 335         return 0;
 336 }
 337
 338 static int init_names(struct gfs2_sbd *sdp, int silent)
 339 {
 340         char *proto, *table;
 341         int error = 0;
 342
 343         proto = sdp->sd_args.ar_lockproto;
 344         table = sdp->sd_args.ar_locktable;
 345
 346         /*  Try to autodetect  */
 347
 348         if (!proto[0] || !table[0]) {
 349                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
 350                 if (error)
 351                         return error;
 352
 353                 if (!proto[0])
 354                         proto = sdp->sd_sb.sb_lockproto;
 355                 if (!table[0])
 356                         table = sdp->sd_sb.sb_locktable;
 357         }
 358
 359         if (!table[0])
 360                 table = sdp->sd_vfs->s_id;
 361
 362         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 363         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 364
 365         table = sdp->sd_table_name;
 366         while ((table = strchr(table, '/')))
 367                 *table = '_';
 368
 369         return error;
 370 }
 371
 372 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 373                         int undo)
 374 {
 375         int error = 0;
 376
 377         if (undo)
 378                 goto fail_trans;
 379
 380         error = gfs2_glock_nq_num(sdp,
 381                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 382                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 383                                   mount_gh);
 384         if (error) {
 385                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 386                 goto fail;
 387         }
 388
 389         error = gfs2_glock_nq_num(sdp,
 390                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 391                                   LM_ST_SHARED,
 392                                   LM_FLAG_NOEXP | GL_EXACT,
 393                                   &sdp->sd_live_gh);
 394         if (error) {
 395                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 396                 goto fail_mount;
 397         }
 398
 399         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 400                                CREATE, &sdp->sd_rename_gl);
 401         if (error) {
 402                 fs_err(sdp, "can't create rename glock: %d\n", error);
 403                 goto fail_live;
 404         }
 405
 406         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 407                                CREATE, &sdp->sd_trans_gl);
 408         if (error) {
 409                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 410                 goto fail_rename;
 411         }
 412
 413         return 0;
 414
 415 fail_trans:
 416         gfs2_glock_put(sdp->sd_trans_gl);
 417 fail_rename:
 418         gfs2_glock_put(sdp->sd_rename_gl);
 419 fail_live:
 420         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 421 fail_mount:
 422         gfs2_glock_dq_uninit(mount_gh);
 423 fail:
 424         return error;
 425 }
 426
 427 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
 428                             u64 no_addr, const char *name)
 429 {
 430         struct gfs2_sbd *sdp = sb->s_fs_info;
 431         struct dentry *dentry;
 432         struct inode *inode;
 433
 434         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 435         if (IS_ERR(inode)) {
 436                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
 437                 return PTR_ERR(inode);
 438         }
 439         dentry = d_make_root(inode);
 440         if (!dentry) {
 441                 fs_err(sdp, "can't alloc %s dentry\n", name);
 442                 return -ENOMEM;
 443         }
 444         *dptr = dentry;
 445         return 0;
 446 }
 447
 448 static int init_sb(struct gfs2_sbd *sdp, int silent)
 449 {
 450         struct super_block *sb = sdp->sd_vfs;
 451         struct gfs2_holder sb_gh;
 452         u64 no_addr;
 453         int ret;
 454
 455         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 456                                 LM_ST_SHARED, 0, &sb_gh);
 457         if (ret) {
 458                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
 459                 return ret;
 460         }
 461
 462         ret = gfs2_read_sb(sdp, silent);
 463         if (ret) {
 464                 fs_err(sdp, "can't read superblock: %d\n", ret);
 465                 goto out;
 466         }
 467
 468         /* Set up the buffer cache and SB for real */
 469         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
 470                 ret = -EINVAL;
 471                 fs_err(sdp, "FS block size (%u) is too small for device "
 472                        "block size (%u)\n",
 473                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
 474                 goto out;
 475         }
 476         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 477                 ret = -EINVAL;
 478                 fs_err(sdp, "FS block size (%u) is too big for machine "
 479                        "page size (%u)\n",
 480                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 481                 goto out;
 482         }
 483         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 484
 485         /* Get the root inode */
 486         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 487         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
 488         if (ret)
 489                 goto out;
 490
 491         /* Get the master inode */
 492         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 493         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
 494         if (ret) {
 495                 dput(sdp->sd_root_dir);
 496                 goto out;
 497         }
 498         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
 499 out:
 500         gfs2_glock_dq_uninit(&sb_gh);
 501         return ret;
 502 }
 503
 504 /**
 505  * map_journal_extents - create a reusable "extent" mapping from all logical
 506  * blocks to all physical blocks for the given journal.  This will save
 507  * us time when writing journal blocks.  Most journals will have only one
 508  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 509  * arranges the journal blocks sequentially to maximize performance.
 510  * So the extent would map the first block for the entire file length.
 511  * However, gfs2_jadd can happen while file activity is happening, so
 512  * those journals may not be sequential.  Less likely is the case where
 513  * the users created their own journals by mounting the metafs and
 514  * laying it out.  But it's still possible.  These journals might have
 515  * several extents.
 516  *
 517  * TODO: This should be done in bigger chunks rather than one block at a time,
 518  *       but since it's only done at mount time, I'm not worried about the
 519  *       time it takes.
 520  */
 521 static int map_journal_extents(struct gfs2_sbd *sdp)
 522 {
 523         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 524         unsigned int lb;
 525         u64 db, prev_db; /* logical block, disk block, prev disk block */
 526         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 527         struct gfs2_journal_extent *jext = NULL;
 528         struct buffer_head bh;
 529         int rc = 0;
 530
 531         prev_db = 0;
 532
 533         for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
 534                 bh.b_state = 0;
 535                 bh.b_blocknr = 0;
 536                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 537                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 538                 db = bh.b_blocknr;
 539                 if (rc || !db) {
 540                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 541                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 542                         break;
 543                 }
 544                 if (!prev_db || db != prev_db + 1) {
 545                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 546                                        GFP_KERNEL);
 547                         if (!jext) {
 548                                 printk(KERN_INFO "GFS2 error: out of memory "
 549                                        "mapping journal extents.\n");
 550                                 rc = -ENOMEM;
 551                                 break;
 552                         }
 553                         jext->dblock = db;
 554                         jext->lblock = lb;
 555                         jext->blocks = 1;
 556                         list_add_tail(&jext->extent_list, &jd->extent_list);
 557                 } else {
 558                         jext->blocks++;
 559                 }
 560                 prev_db = db;
 561         }
 562         return rc;
 563 }
 564
 565 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
 566 {
 567         char *message = "FIRSTMOUNT=Done";
 568         char *envp[] = { message, NULL };
 569
 570         fs_info(sdp, "first mount done, others may mount\n");
 571
 572         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
 573                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
 574
 575         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
 576 }
 577
 578 /**
 579  * gfs2_jindex_hold - Grab a lock on the jindex
 580  * @sdp: The GFS2 superblock
 581  * @ji_gh: the holder for the jindex glock
 582  *
 583  * Returns: errno
 584  */
 585
 586 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
 587 {
 588         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
 589         struct qstr name;
 590         char buf[20];
 591         struct gfs2_jdesc *jd;
 592         int error;
 593
 594         name.name = buf;
 595
 596         mutex_lock(&sdp->sd_jindex_mutex);
 597
 598         for (;;) {
 599                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
 600                 if (error)
 601                         break;
 602
 603                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
 604                 name.hash = gfs2_disk_hash(name.name, name.len);
 605
 606                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
 607                 if (error == -ENOENT) {
 608                         error = 0;
 609                         break;
 610                 }
 611
 612                 gfs2_glock_dq_uninit(ji_gh);
 613
 614                 if (error)
 615                         break;
 616
 617                 error = -ENOMEM;
 618                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
 619                 if (!jd)
 620                         break;
 621
 622                 INIT_LIST_HEAD(&jd->extent_list);
 623                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
 624                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
 625                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
 626                         if (!jd->jd_inode)
 627                                 error = -ENOENT;
 628                         else
 629                                 error = PTR_ERR(jd->jd_inode);
 630                         kfree(jd);
 631                         break;
 632                 }
 633
 634                 spin_lock(&sdp->sd_jindex_spin);
 635                 jd->jd_jid = sdp->sd_journals++;
 636                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
 637                 spin_unlock(&sdp->sd_jindex_spin);
 638         }
 639
 640         mutex_unlock(&sdp->sd_jindex_mutex);
 641
 642         return error;
 643 }
 644
 645 static int init_journal(struct gfs2_sbd *sdp, int undo)
 646 {
 647         struct inode *master = sdp->sd_master_dir->d_inode;
 648         struct gfs2_holder ji_gh;
 649         struct gfs2_inode *ip;
 650         int jindex = 1;
 651         int error = 0;
 652
 653         if (undo) {
 654                 jindex = 0;
 655                 goto fail_jinode_gh;
 656         }
 657
 658         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
 659         if (IS_ERR(sdp->sd_jindex)) {
 660                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 661                 return PTR_ERR(sdp->sd_jindex);
 662         }
 663
 664         /* Load in the journal index special file */
 665
 666         error = gfs2_jindex_hold(sdp, &ji_gh);
 667         if (error) {
 668                 fs_err(sdp, "can't read journal index: %d\n", error);
 669                 goto fail;
 670         }
 671
 672         error = -EUSERS;
 673         if (!gfs2_jindex_size(sdp)) {
 674                 fs_err(sdp, "no journals!\n");
 675                 goto fail_jindex;
 676         }
 677
 678         if (sdp->sd_args.ar_spectator) {
 679                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 680                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 681                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 682                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 683         } else {
 684                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 685                         fs_err(sdp, "can't mount journal #%u\n",
 686                                sdp->sd_lockstruct.ls_jid);
 687                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 688                                gfs2_jindex_size(sdp),
 689                                gfs2_jindex_size(sdp) - 1);
 690                         goto fail_jindex;
 691                 }
 692                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 693
 694                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 695                                           &gfs2_journal_glops,
 696                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 697                                           &sdp->sd_journal_gh);
 698                 if (error) {
 699                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 700                         goto fail_jindex;
 701                 }
 702
 703                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 704                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 705                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 706                                            &sdp->sd_jinode_gh);
 707                 if (error) {
 708                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 709                                error);
 710                         goto fail_journal_gh;
 711                 }
 712
 713                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 714                 if (error) {
 715                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 716                                sdp->sd_jdesc->jd_jid, error);
 717                         goto fail_jinode_gh;
 718                 }
 719                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 720                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
 721                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
 722
 723                 /* Map the extents for this journal's blocks */
 724                 map_journal_extents(sdp);
 725         }
 726         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
 727
 728         if (sdp->sd_lockstruct.ls_first) {
 729                 unsigned int x;
 730                 for (x = 0; x < sdp->sd_journals; x++) {
 731                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x),
 732                                                      true);
 733                         if (error) {
 734                                 fs_err(sdp, "error recovering journal %u: %d\n",
 735                                        x, error);
 736                                 goto fail_jinode_gh;
 737                         }
 738                 }
 739
 740                 gfs2_others_may_mount(sdp);
 741         } else if (!sdp->sd_args.ar_spectator) {
 742                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
 743                 if (error) {
 744                         fs_err(sdp, "error recovering my journal: %d\n", error);
 745                         goto fail_jinode_gh;
 746                 }
 747         }
 748
 749         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 750         gfs2_glock_dq_uninit(&ji_gh);
 751         jindex = 0;
 752
 753         return 0;
 754
 755 fail_jinode_gh:
 756         if (!sdp->sd_args.ar_spectator)
 757                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 758 fail_journal_gh:
 759         if (!sdp->sd_args.ar_spectator)
 760                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 761 fail_jindex:
 762         gfs2_jindex_free(sdp);
 763         if (jindex)
 764                 gfs2_glock_dq_uninit(&ji_gh);
 765 fail:
 766         iput(sdp->sd_jindex);
 767         return error;
 768 }
 769
 770
 771 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 772 {
 773         int error = 0;
 774         struct inode *master = sdp->sd_master_dir->d_inode;
 775
 776         if (undo)
 777                 goto fail_qinode;
 778
 779         error = init_journal(sdp, undo);
 780         if (error)
 781                 goto fail;
 782
 783         /* Read in the master statfs inode */
 784         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
 785         if (IS_ERR(sdp->sd_statfs_inode)) {
 786                 error = PTR_ERR(sdp->sd_statfs_inode);
 787                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 788                 goto fail_journal;
 789         }
 790
 791         /* Read in the resource index inode */
 792         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
 793         if (IS_ERR(sdp->sd_rindex)) {
 794                 error = PTR_ERR(sdp->sd_rindex);
 795                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 796                 goto fail_statfs;
 797         }
 798         sdp->sd_rindex_uptodate = 0;
 799
 800         /* Read in the quota inode */
 801         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
 802         if (IS_ERR(sdp->sd_quota_inode)) {
 803                 error = PTR_ERR(sdp->sd_quota_inode);
 804                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 805                 goto fail_rindex;
 806         }
 807
 808         error = gfs2_rindex_update(sdp);
 809         if (error)
 810                 goto fail_qinode;
 811
 812         return 0;
 813
 814 fail_qinode:
 815         iput(sdp->sd_quota_inode);
 816 fail_rindex:
 817         gfs2_clear_rgrpd(sdp);
 818         iput(sdp->sd_rindex);
 819 fail_statfs:
 820         iput(sdp->sd_statfs_inode);
 821 fail_journal:
 822         init_journal(sdp, UNDO);
 823 fail:
 824         return error;
 825 }
 826
 827 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 828 {
 829         struct inode *pn = NULL;
 830         char buf[30];
 831         int error = 0;
 832         struct gfs2_inode *ip;
 833         struct inode *master = sdp->sd_master_dir->d_inode;
 834
 835         if (sdp->sd_args.ar_spectator)
 836                 return 0;
 837
 838         if (undo)
 839                 goto fail_qc_gh;
 840
 841         pn = gfs2_lookup_simple(master, "per_node");
 842         if (IS_ERR(pn)) {
 843                 error = PTR_ERR(pn);
 844                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 845                 return error;
 846         }
 847
 848         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 849         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 850         if (IS_ERR(sdp->sd_sc_inode)) {
 851                 error = PTR_ERR(sdp->sd_sc_inode);
 852                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 853                 goto fail;
 854         }
 855
 856         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 857         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 858         if (IS_ERR(sdp->sd_qc_inode)) {
 859                 error = PTR_ERR(sdp->sd_qc_inode);
 860                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 861                 goto fail_ut_i;
 862         }
 863
 864         iput(pn);
 865         pn = NULL;
 866
 867         ip = GFS2_I(sdp->sd_sc_inode);
 868         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 869                                    &sdp->sd_sc_gh);
 870         if (error) {
 871                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 872                 goto fail_qc_i;
 873         }
 874
 875         ip = GFS2_I(sdp->sd_qc_inode);
 876         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
 877                                    &sdp->sd_qc_gh);
 878         if (error) {
 879                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 880                 goto fail_ut_gh;
 881         }
 882
 883         return 0;
 884
 885 fail_qc_gh:
 886         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 887 fail_ut_gh:
 888         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 889 fail_qc_i:
 890         iput(sdp->sd_qc_inode);
 891 fail_ut_i:
 892         iput(sdp->sd_sc_inode);
 893 fail:
 894         if (pn)
 895                 iput(pn);
 896         return error;
 897 }
 898
 899 static int init_threads(struct gfs2_sbd *sdp, int undo)
 900 {
 901         struct task_struct *p;
 902         int error = 0;
 903
 904         if (undo)
 905                 goto fail_quotad;
 906
 907         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 908         error = IS_ERR(p);
 909         if (error) {
 910                 fs_err(sdp, "can't start logd thread: %d\n", error);
 911                 return error;
 912         }
 913         sdp->sd_logd_process = p;
 914
 915         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 916         error = IS_ERR(p);
 917         if (error) {
 918                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 919                 goto fail;
 920         }
 921         sdp->sd_quotad_process = p;
 922
 923         return 0;
 924
 925
 926 fail_quotad:
 927         kthread_stop(sdp->sd_quotad_process);
 928 fail:
 929         kthread_stop(sdp->sd_logd_process);
 930         return error;
 931 }
 932
 933 static const match_table_t nolock_tokens = {
 934         { Opt_jid, "jid=%d\n", },
 935         { Opt_err, NULL },
 936 };
 937
 938 static const struct lm_lockops nolock_ops = {
 939         .lm_proto_name = "lock_nolock",
 940         .lm_put_lock = gfs2_glock_free,
 941         .lm_tokens = &nolock_tokens,
 942 };
 943
 944 /**
 945  * gfs2_lm_mount - mount a locking protocol
 946  * @sdp: the filesystem
 947  * @args: mount arguments
 948  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 949  *
 950  * Returns: errno
 951  */
 952
 953 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 954 {
 955         const struct lm_lockops *lm;
 956         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
 957         struct gfs2_args *args = &sdp->sd_args;
 958         const char *proto = sdp->sd_proto_name;
 959         const char *table = sdp->sd_table_name;
 960         char *o, *options;
 961         int ret;
 962
 963         if (!strcmp("lock_nolock", proto)) {
 964                 lm = &nolock_ops;
 965                 sdp->sd_args.ar_localflocks = 1;
 966 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
 967         } else if (!strcmp("lock_dlm", proto)) {
 968                 lm = &gfs2_dlm_ops;
 969 #endif
 970         } else {
 971                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
 972                 return -ENOENT;
 973         }
 974
 975         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 976
 977         ls->ls_ops = lm;
 978         ls->ls_first = 1;
 979
 980         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
 981                 substring_t tmp[MAX_OPT_ARGS];
 982                 int token, option;
 983
 984                 if (!o || !*o)
 985                         continue;
 986
 987                 token = match_token(o, *lm->lm_tokens, tmp);
 988                 switch (token) {
 989                 case Opt_jid:
 990                         ret = match_int(&tmp[0], &option);
 991                         if (ret || option < 0)
 992                                 goto hostdata_error;
 993                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
 994                                 ls->ls_jid = option;
 995                         break;
 996                 case Opt_id:
 997                         /* Obsolete, but left for backward compat purposes */
 998                         break;
 999                 case Opt_first:
1000                         ret = match_int(&tmp[0], &option);
1001                         if (ret || (option != 0 && option != 1))
1002                                 goto hostdata_error;
1003                         ls->ls_first = option;
1004                         break;
1005                 case Opt_nodir:
1006                         ret = match_int(&tmp[0], &option);
1007                         if (ret || (option != 0 && option != 1))
1008                                 goto hostdata_error;
1009                         ls->ls_nodir = option;
1010                         break;
1011                 case Opt_err:
1012                 default:
1013 hostdata_error:
1014                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1015                         return -EINVAL;
1016                 }
1017         }
1018
1019         if (lm->lm_mount == NULL) {
1020                 fs_info(sdp, "Now mounting FS...\n");
1021                 complete_all(&sdp->sd_locking_init);
1022                 return 0;
1023         }
1024         ret = lm->lm_mount(sdp, table);
1025         if (ret == 0)
1026                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1027         complete_all(&sdp->sd_locking_init);
1028         return ret;
1029 }
1030
1031 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1032 {
1033         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1034         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1035             lm->lm_unmount)
1036                 lm->lm_unmount(sdp);
1037 }
1038
1039 static int gfs2_journalid_wait(void *word)
1040 {
1041         if (signal_pending(current))
1042                 return -EINTR;
1043         schedule();
1044         return 0;
1045 }
1046
1047 static int wait_on_journal(struct gfs2_sbd *sdp)
1048 {
1049         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1050                 return 0;
1051
1052         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1053 }
1054
1055 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1056 {
1057         struct super_block *sb = sdp->sd_vfs;
1058         char ro[20];
1059         char spectator[20];
1060         char *envp[] = { ro, spectator, NULL };
1061         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1062         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1063         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1064 }
1065
1066 /**
1067  * fill_super - Read in superblock
1068  * @sb: The VFS superblock
1069  * @data: Mount options
1070  * @silent: Don't complain if it's not a GFS2 filesystem
1071  *
1072  * Returns: errno
1073  */
1074
1075 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1076 {
1077         struct gfs2_sbd *sdp;
1078         struct gfs2_holder mount_gh;
1079         int error;
1080
1081         sdp = init_sbd(sb);
1082         if (!sdp) {
1083                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
1084                 return -ENOMEM;
1085         }
1086         sdp->sd_args = *args;
1087
1088         if (sdp->sd_args.ar_spectator) {
1089                 sb->s_flags |= MS_RDONLY;
1090                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1091         }
1092         if (sdp->sd_args.ar_posix_acl)
1093                 sb->s_flags |= MS_POSIXACL;
1094         if (sdp->sd_args.ar_nobarrier)
1095                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1096
1097         sb->s_flags |= MS_NOSEC;
1098         sb->s_magic = GFS2_MAGIC;
1099         sb->s_op = &gfs2_super_ops;
1100         sb->s_d_op = &gfs2_dops;
1101         sb->s_export_op = &gfs2_export_ops;
1102         sb->s_xattr = gfs2_xattr_handlers;
1103         sb->s_qcop = &gfs2_quotactl_ops;
1104         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1105         sb->s_time_gran = 1;
1106         sb->s_maxbytes = MAX_LFS_FILESIZE;
1107
1108         /* Set up the buffer cache and fill in some fake block size values
1109            to allow us to read-in the on-disk superblock. */
1110         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1111         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1112         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1113                                GFS2_BASIC_BLOCK_SHIFT;
1114         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
1115
1116         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1117         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1118         if (sdp->sd_args.ar_statfs_quantum) {
1119                 sdp->sd_tune.gt_statfs_slow = 0;
1120                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1121         } else {
1122                 sdp->sd_tune.gt_statfs_slow = 1;
1123                 sdp->sd_tune.gt_statfs_quantum = 30;
1124         }
1125
1126         error = init_names(sdp, silent);
1127         if (error)
1128                 goto fail;
1129
1130         snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1131
1132         gfs2_create_debugfs_file(sdp);
1133
1134         error = gfs2_sys_fs_add(sdp);
1135         if (error)
1136                 goto fail;
1137
1138         error = gfs2_lm_mount(sdp, silent);
1139         if (error)
1140                 goto fail_sys;
1141
1142         error = init_locking(sdp, &mount_gh, DO);
1143         if (error)
1144                 goto fail_lm;
1145
1146         error = init_sb(sdp, silent);
1147         if (error)
1148                 goto fail_locking;
1149
1150         error = wait_on_journal(sdp);
1151         if (error)
1152                 goto fail_sb;
1153
1154         /*
1155          * If user space has failed to join the cluster or some similar
1156          * failure has occurred, then the journal id will contain a
1157          * negative (error) number. This will then be returned to the
1158          * caller (of the mount syscall). We do this even for spectator
1159          * mounts (which just write a jid of 0 to indicate "ok" even though
1160          * the jid is unused in the spectator case)
1161          */
1162         if (sdp->sd_lockstruct.ls_jid < 0) {
1163                 error = sdp->sd_lockstruct.ls_jid;
1164                 sdp->sd_lockstruct.ls_jid = 0;
1165                 goto fail_sb;
1166         }
1167
1168         if (sdp->sd_args.ar_spectator)
1169                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1170                          sdp->sd_table_name);
1171         else
1172                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1173                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1174
1175         error = init_inodes(sdp, DO);
1176         if (error)
1177                 goto fail_sb;
1178
1179         error = init_per_node(sdp, DO);
1180         if (error)
1181                 goto fail_inodes;
1182
1183         error = gfs2_statfs_init(sdp);
1184         if (error) {
1185                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1186                 goto fail_per_node;
1187         }
1188
1189         error = init_threads(sdp, DO);
1190         if (error)
1191                 goto fail_per_node;
1192
1193         if (!(sb->s_flags & MS_RDONLY)) {
1194                 error = gfs2_make_fs_rw(sdp);
1195                 if (error) {
1196                         fs_err(sdp, "can't make FS RW: %d\n", error);
1197                         goto fail_threads;
1198                 }
1199         }
1200
1201         gfs2_glock_dq_uninit(&mount_gh);
1202         gfs2_online_uevent(sdp);
1203         return 0;
1204
1205 fail_threads:
1206         init_threads(sdp, UNDO);
1207 fail_per_node:
1208         init_per_node(sdp, UNDO);
1209 fail_inodes:
1210         init_inodes(sdp, UNDO);
1211 fail_sb:
1212         if (sdp->sd_root_dir)
1213                 dput(sdp->sd_root_dir);
1214         if (sdp->sd_master_dir)
1215                 dput(sdp->sd_master_dir);
1216         if (sb->s_root)
1217                 dput(sb->s_root);
1218         sb->s_root = NULL;
1219 fail_locking:
1220         init_locking(sdp, &mount_gh, UNDO);
1221 fail_lm:
1222         gfs2_gl_hash_clear(sdp);
1223         gfs2_lm_unmount(sdp);
1224 fail_sys:
1225         gfs2_sys_fs_del(sdp);
1226 fail:
1227         gfs2_delete_debugfs_file(sdp);
1228         free_percpu(sdp->sd_lkstats);
1229         kfree(sdp);
1230         sb->s_fs_info = NULL;
1231         return error;
1232 }
1233
1234 static int set_gfs2_super(struct super_block *s, void *data)
1235 {
1236         s->s_bdev = data;
1237         s->s_dev = s->s_bdev->bd_dev;
1238
1239         /*
1240          * We set the bdi here to the queue backing, file systems can
1241          * overwrite this in ->fill_super()
1242          */
1243         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1244         return 0;
1245 }
1246
1247 static int test_gfs2_super(struct super_block *s, void *ptr)
1248 {
1249         struct block_device *bdev = ptr;
1250         return (bdev == s->s_bdev);
1251 }
1252
1253 /**
1254  * gfs2_mount - Get the GFS2 superblock
1255  * @fs_type: The GFS2 filesystem type
1256  * @flags: Mount flags
1257  * @dev_name: The name of the device
1258  * @data: The mount arguments
1259  *
1260  * Q. Why not use get_sb_bdev() ?
1261  * A. We need to select one of two root directories to mount, independent
1262  *    of whether this is the initial, or subsequent, mount of this sb
1263  *
1264  * Returns: 0 or -ve on error
1265  */
1266
1267 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1268                        const char *dev_name, void *data)
1269 {
1270         struct block_device *bdev;
1271         struct super_block *s;
1272         fmode_t mode = FMODE_READ | FMODE_EXCL;
1273         int error;
1274         struct gfs2_args args;
1275         struct gfs2_sbd *sdp;
1276
1277         if (!(flags & MS_RDONLY))
1278                 mode |= FMODE_WRITE;
1279
1280         bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1281         if (IS_ERR(bdev))
1282                 return ERR_CAST(bdev);
1283
1284         /*
1285          * once the super is inserted into the list by sget, s_umount
1286          * will protect the lockfs code from trying to start a snapshot
1287          * while we are mounting
1288          */
1289         mutex_lock(&bdev->bd_fsfreeze_mutex);
1290         if (bdev->bd_fsfreeze_count > 0) {
1291                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1292                 error = -EBUSY;
1293                 goto error_bdev;
1294         }
1295         s = sget(fs_type, test_gfs2_super, set_gfs2_super, bdev);
1296         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1297         error = PTR_ERR(s);
1298         if (IS_ERR(s))
1299                 goto error_bdev;
1300
1301         if (s->s_root)
1302                 blkdev_put(bdev, mode);
1303
1304         memset(&args, 0, sizeof(args));
1305         args.ar_quota = GFS2_QUOTA_DEFAULT;
1306         args.ar_data = GFS2_DATA_DEFAULT;
1307         args.ar_commit = 30;
1308         args.ar_statfs_quantum = 30;
1309         args.ar_quota_quantum = 60;
1310         args.ar_errors = GFS2_ERRORS_DEFAULT;
1311
1312         error = gfs2_mount_args(&args, data);
1313         if (error) {
1314                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1315                 goto error_super;
1316         }
1317
1318         if (s->s_root) {
1319                 error = -EBUSY;
1320                 if ((flags ^ s->s_flags) & MS_RDONLY)
1321                         goto error_super;
1322         } else {
1323                 char b[BDEVNAME_SIZE];
1324
1325                 s->s_flags = flags;
1326                 s->s_mode = mode;
1327                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1328                 sb_set_blocksize(s, block_size(bdev));
1329                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1330                 if (error)
1331                         goto error_super;
1332                 s->s_flags |= MS_ACTIVE;
1333                 bdev->bd_super = s;
1334         }
1335
1336         sdp = s->s_fs_info;
1337         if (args.ar_meta)
1338                 return dget(sdp->sd_master_dir);
1339         else
1340                 return dget(sdp->sd_root_dir);
1341
1342 error_super:
1343         deactivate_locked_super(s);
1344         return ERR_PTR(error);
1345 error_bdev:
1346         blkdev_put(bdev, mode);
1347         return ERR_PTR(error);
1348 }
1349
1350 static int set_meta_super(struct super_block *s, void *ptr)
1351 {
1352         return -EINVAL;
1353 }
1354
1355 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1356                         int flags, const char *dev_name, void *data)
1357 {
1358         struct super_block *s;
1359         struct gfs2_sbd *sdp;
1360         struct path path;
1361         int error;
1362
1363         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1364         if (error) {
1365                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1366                        dev_name, error);
1367                 return ERR_PTR(error);
1368         }
1369         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super,
1370                  path.dentry->d_inode->i_sb->s_bdev);
1371         path_put(&path);
1372         if (IS_ERR(s)) {
1373                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1374                 return ERR_CAST(s);
1375         }
1376         if ((flags ^ s->s_flags) & MS_RDONLY) {
1377                 deactivate_locked_super(s);
1378                 return ERR_PTR(-EBUSY);
1379         }
1380         sdp = s->s_fs_info;
1381         return dget(sdp->sd_master_dir);
1382 }
1383
1384 static void gfs2_kill_sb(struct super_block *sb)
1385 {
1386         struct gfs2_sbd *sdp = sb->s_fs_info;
1387
1388         if (sdp == NULL) {
1389                 kill_block_super(sb);
1390                 return;
1391         }
1392
1393         gfs2_meta_syncfs(sdp);
1394         dput(sdp->sd_root_dir);
1395         dput(sdp->sd_master_dir);
1396         sdp->sd_root_dir = NULL;
1397         sdp->sd_master_dir = NULL;
1398         shrink_dcache_sb(sb);
1399         kill_block_super(sb);
1400         gfs2_delete_debugfs_file(sdp);
1401         free_percpu(sdp->sd_lkstats);
1402         kfree(sdp);
1403 }
1404
1405 struct file_system_type gfs2_fs_type = {
1406         .name = "gfs2",
1407         .fs_flags = FS_REQUIRES_DEV,
1408         .mount = gfs2_mount,
1409         .kill_sb = gfs2_kill_sb,
1410         .owner = THIS_MODULE,
1411 };
1412
1413 struct file_system_type gfs2meta_fs_type = {
1414         .name = "gfs2meta",
1415         .fs_flags = FS_REQUIRES_DEV,
1416         .mount = gfs2_mount_meta,
1417         .owner = THIS_MODULE,
1418 };
1419