SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/lm_interface.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "bmap.h"
  25 #include "daemon.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.h"
  29 #include "lm.h"
  30 #include "mount.h"
  31 #include "ops_fstype.h"
  32 #include "ops_dentry.h"
  33 #include "ops_super.h"
  34 #include "recovery.h"
  35 #include "rgrp.h"
  36 #include "super.h"
  37 #include "sys.h"
  38 #include "util.h"
  39 #include "log.h"
  40
  41 #define DO 0
  42 #define UNDO 1
  43
  44 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  45 {
  46         struct gfs2_sbd *sdp;
  47
  48         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  49         if (!sdp)
  50                 return NULL;
  51
  52         sb->s_fs_info = sdp;
  53         sdp->sd_vfs = sb;
  54
  55         gfs2_tune_init(&sdp->sd_tune);
  56
  57         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  58         spin_lock_init(&sdp->sd_reclaim_lock);
  59         init_waitqueue_head(&sdp->sd_reclaim_wq);
  60
  61         mutex_init(&sdp->sd_inum_mutex);
  62         spin_lock_init(&sdp->sd_statfs_spin);
  63         mutex_init(&sdp->sd_statfs_mutex);
  64
  65         spin_lock_init(&sdp->sd_rindex_spin);
  66         mutex_init(&sdp->sd_rindex_mutex);
  67         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  68         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  69         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  70
  71         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  72         spin_lock_init(&sdp->sd_jindex_spin);
  73         mutex_init(&sdp->sd_jindex_mutex);
  74
  75         INIT_LIST_HEAD(&sdp->sd_quota_list);
  76         spin_lock_init(&sdp->sd_quota_spin);
  77         mutex_init(&sdp->sd_quota_mutex);
  78
  79         spin_lock_init(&sdp->sd_log_lock);
  80
  81         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  84         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  85         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
  86
  87         mutex_init(&sdp->sd_log_reserve_mutex);
  88         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  89         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  90
  91         init_rwsem(&sdp->sd_log_flush_lock);
  92         atomic_set(&sdp->sd_log_in_flight, 0);
  93         init_waitqueue_head(&sdp->sd_log_flush_wait);
  94
  95         INIT_LIST_HEAD(&sdp->sd_revoke_list);
  96
  97         mutex_init(&sdp->sd_freeze_lock);
  98
  99         return sdp;
 100 }
 101
 102 static void init_vfs(struct super_block *sb, unsigned noatime)
 103 {
 104         struct gfs2_sbd *sdp = sb->s_fs_info;
 105
 106         sb->s_magic = GFS2_MAGIC;
 107         sb->s_op = &gfs2_super_ops;
 108         sb->s_export_op = &gfs2_export_ops;
 109         sb->s_time_gran = 1;
 110         sb->s_maxbytes = MAX_LFS_FILESIZE;
 111
 112         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 113                 set_bit(noatime, &sdp->sd_flags);
 114
 115         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 116         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 117 }
 118
 119 static int init_names(struct gfs2_sbd *sdp, int silent)
 120 {
 121         char *proto, *table;
 122         int error = 0;
 123
 124         proto = sdp->sd_args.ar_lockproto;
 125         table = sdp->sd_args.ar_locktable;
 126
 127         /*  Try to autodetect  */
 128
 129         if (!proto[0] || !table[0]) {
 130                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 131                 if (error)
 132                         return error;
 133
 134                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 135                 if (error)
 136                         goto out;
 137
 138                 if (!proto[0])
 139                         proto = sdp->sd_sb.sb_lockproto;
 140                 if (!table[0])
 141                         table = sdp->sd_sb.sb_locktable;
 142         }
 143
 144         if (!table[0])
 145                 table = sdp->sd_vfs->s_id;
 146
 147         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 148         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 149
 150         table = sdp->sd_table_name;
 151         while ((table = strchr(table, '/')))
 152                 *table = '_';
 153
 154 out:
 155         return error;
 156 }
 157
 158 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 159                         int undo)
 160 {
 161         struct task_struct *p;
 162         int error = 0;
 163
 164         if (undo)
 165                 goto fail_trans;
 166
 167         for (sdp->sd_glockd_num = 0;
 168              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 169              sdp->sd_glockd_num++) {
 170                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 171                 error = IS_ERR(p);
 172                 if (error) {
 173                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 174                         goto fail;
 175                 }
 176                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 177         }
 178
 179         error = gfs2_glock_nq_num(sdp,
 180                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 181                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 182                                   mount_gh);
 183         if (error) {
 184                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 185                 goto fail;
 186         }
 187
 188         error = gfs2_glock_nq_num(sdp,
 189                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 190                                   LM_ST_SHARED,
 191                                   LM_FLAG_NOEXP | GL_EXACT,
 192                                   &sdp->sd_live_gh);
 193         if (error) {
 194                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 195                 goto fail_mount;
 196         }
 197
 198         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 199                                CREATE, &sdp->sd_rename_gl);
 200         if (error) {
 201                 fs_err(sdp, "can't create rename glock: %d\n", error);
 202                 goto fail_live;
 203         }
 204
 205         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 206                                CREATE, &sdp->sd_trans_gl);
 207         if (error) {
 208                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 209                 goto fail_rename;
 210         }
 211         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 212
 213         return 0;
 214
 215 fail_trans:
 216         gfs2_glock_put(sdp->sd_trans_gl);
 217 fail_rename:
 218         gfs2_glock_put(sdp->sd_rename_gl);
 219 fail_live:
 220         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 221 fail_mount:
 222         gfs2_glock_dq_uninit(mount_gh);
 223 fail:
 224         while (sdp->sd_glockd_num--)
 225                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 226
 227         return error;
 228 }
 229
 230 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 231                                              u64 no_addr)
 232 {
 233         return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
 234 }
 235
 236 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 237 {
 238         struct super_block *sb = sdp->sd_vfs;
 239         struct gfs2_holder sb_gh;
 240         u64 no_addr;
 241         struct inode *inode;
 242         int error = 0;
 243
 244         if (undo) {
 245                 if (sb->s_root) {
 246                         dput(sb->s_root);
 247                         sb->s_root = NULL;
 248                 }
 249                 return 0;
 250         }
 251
 252         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 253                                  LM_ST_SHARED, 0, &sb_gh);
 254         if (error) {
 255                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 256                 return error;
 257         }
 258
 259         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 260         if (error) {
 261                 fs_err(sdp, "can't read superblock: %d\n", error);
 262                 goto out;
 263         }
 264
 265         /* Set up the buffer cache and SB for real */
 266         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 267                 error = -EINVAL;
 268                 fs_err(sdp, "FS block size (%u) is too small for device "
 269                        "block size (%u)\n",
 270                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 271                 goto out;
 272         }
 273         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 274                 error = -EINVAL;
 275                 fs_err(sdp, "FS block size (%u) is too big for machine "
 276                        "page size (%u)\n",
 277                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 278                 goto out;
 279         }
 280         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 281
 282         /* Get the root inode */
 283         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 284         if (sb->s_type == &gfs2meta_fs_type)
 285                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 286         inode = gfs2_lookup_root(sb, no_addr);
 287         if (IS_ERR(inode)) {
 288                 error = PTR_ERR(inode);
 289                 fs_err(sdp, "can't read in root inode: %d\n", error);
 290                 goto out;
 291         }
 292
 293         sb->s_root = d_alloc_root(inode);
 294         if (!sb->s_root) {
 295                 fs_err(sdp, "can't get root dentry\n");
 296                 error = -ENOMEM;
 297                 iput(inode);
 298         } else
 299                 sb->s_root->d_op = &gfs2_dops;
 300
 301 out:
 302         gfs2_glock_dq_uninit(&sb_gh);
 303         return error;
 304 }
 305
 306 /**
 307  * map_journal_extents - create a reusable "extent" mapping from all logical
 308  * blocks to all physical blocks for the given journal.  This will save
 309  * us time when writing journal blocks.  Most journals will have only one
 310  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 311  * arranges the journal blocks sequentially to maximize performance.
 312  * So the extent would map the first block for the entire file length.
 313  * However, gfs2_jadd can happen while file activity is happening, so
 314  * those journals may not be sequential.  Less likely is the case where
 315  * the users created their own journals by mounting the metafs and
 316  * laying it out.  But it's still possible.  These journals might have
 317  * several extents.
 318  *
 319  * TODO: This should be done in bigger chunks rather than one block at a time,
 320  *       but since it's only done at mount time, I'm not worried about the
 321  *       time it takes.
 322  */
 323 static int map_journal_extents(struct gfs2_sbd *sdp)
 324 {
 325         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 326         unsigned int lb;
 327         u64 db, prev_db; /* logical block, disk block, prev disk block */
 328         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 329         struct gfs2_journal_extent *jext = NULL;
 330         struct buffer_head bh;
 331         int rc = 0;
 332
 333         INIT_LIST_HEAD(&jd->extent_list);
 334         prev_db = 0;
 335
 336         for (lb = 0; lb < ip->i_di.di_size / sdp->sd_sb.sb_bsize; lb++) {
 337                 bh.b_state = 0;
 338                 bh.b_blocknr = 0;
 339                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 340                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 341                 db = bh.b_blocknr;
 342                 if (rc || !db) {
 343                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 344                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 345                         break;
 346                 }
 347                 if (!prev_db || db != prev_db + 1) {
 348                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 349                                        GFP_KERNEL);
 350                         if (!jext) {
 351                                 printk(KERN_INFO "GFS2 error: out of memory "
 352                                        "mapping journal extents.\n");
 353                                 rc = -ENOMEM;
 354                                 break;
 355                         }
 356                         jext->dblock = db;
 357                         jext->lblock = lb;
 358                         jext->blocks = 1;
 359                         list_add_tail(&jext->extent_list, &jd->extent_list);
 360                 } else {
 361                         jext->blocks++;
 362                 }
 363                 prev_db = db;
 364         }
 365         return rc;
 366 }
 367
 368 static int init_journal(struct gfs2_sbd *sdp, int undo)
 369 {
 370         struct gfs2_holder ji_gh;
 371         struct task_struct *p;
 372         struct gfs2_inode *ip;
 373         int jindex = 1;
 374         int error = 0;
 375
 376         if (undo) {
 377                 jindex = 0;
 378                 goto fail_recoverd;
 379         }
 380
 381         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 382         if (IS_ERR(sdp->sd_jindex)) {
 383                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 384                 return PTR_ERR(sdp->sd_jindex);
 385         }
 386         ip = GFS2_I(sdp->sd_jindex);
 387         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 388
 389         /* Load in the journal index special file */
 390
 391         error = gfs2_jindex_hold(sdp, &ji_gh);
 392         if (error) {
 393                 fs_err(sdp, "can't read journal index: %d\n", error);
 394                 goto fail;
 395         }
 396
 397         error = -EINVAL;
 398         if (!gfs2_jindex_size(sdp)) {
 399                 fs_err(sdp, "no journals!\n");
 400                 goto fail_jindex;
 401         }
 402
 403         if (sdp->sd_args.ar_spectator) {
 404                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 405                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 406         } else {
 407                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 408                         fs_err(sdp, "can't mount journal #%u\n",
 409                                sdp->sd_lockstruct.ls_jid);
 410                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 411                                gfs2_jindex_size(sdp),
 412                                gfs2_jindex_size(sdp) - 1);
 413                         goto fail_jindex;
 414                 }
 415                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 416
 417                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 418                                           &gfs2_journal_glops,
 419                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 420                                           &sdp->sd_journal_gh);
 421                 if (error) {
 422                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 423                         goto fail_jindex;
 424                 }
 425
 426                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 427                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 428                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 429                                            &sdp->sd_jinode_gh);
 430                 if (error) {
 431                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 432                                error);
 433                         goto fail_journal_gh;
 434                 }
 435
 436                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 437                 if (error) {
 438                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 439                                sdp->sd_jdesc->jd_jid, error);
 440                         goto fail_jinode_gh;
 441                 }
 442                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 443
 444                 /* Map the extents for this journal's blocks */
 445                 map_journal_extents(sdp);
 446         }
 447
 448         if (sdp->sd_lockstruct.ls_first) {
 449                 unsigned int x;
 450                 for (x = 0; x < sdp->sd_journals; x++) {
 451                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 452                         if (error) {
 453                                 fs_err(sdp, "error recovering journal %u: %d\n",
 454                                        x, error);
 455                                 goto fail_jinode_gh;
 456                         }
 457                 }
 458
 459                 gfs2_lm_others_may_mount(sdp);
 460         } else if (!sdp->sd_args.ar_spectator) {
 461                 error = gfs2_recover_journal(sdp->sd_jdesc);
 462                 if (error) {
 463                         fs_err(sdp, "error recovering my journal: %d\n", error);
 464                         goto fail_jinode_gh;
 465                 }
 466         }
 467
 468         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 469         gfs2_glock_dq_uninit(&ji_gh);
 470         jindex = 0;
 471
 472         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 473         error = IS_ERR(p);
 474         if (error) {
 475                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 476                 goto fail_jinode_gh;
 477         }
 478         sdp->sd_recoverd_process = p;
 479
 480         return 0;
 481
 482 fail_recoverd:
 483         kthread_stop(sdp->sd_recoverd_process);
 484 fail_jinode_gh:
 485         if (!sdp->sd_args.ar_spectator)
 486                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 487 fail_journal_gh:
 488         if (!sdp->sd_args.ar_spectator)
 489                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 490 fail_jindex:
 491         gfs2_jindex_free(sdp);
 492         if (jindex)
 493                 gfs2_glock_dq_uninit(&ji_gh);
 494 fail:
 495         iput(sdp->sd_jindex);
 496         return error;
 497 }
 498
 499
 500 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 501 {
 502         int error = 0;
 503         struct gfs2_inode *ip;
 504         struct inode *inode;
 505
 506         if (undo)
 507                 goto fail_qinode;
 508
 509         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 510         if (IS_ERR(inode)) {
 511                 error = PTR_ERR(inode);
 512                 fs_err(sdp, "can't read in master directory: %d\n", error);
 513                 goto fail;
 514         }
 515         sdp->sd_master_dir = inode;
 516
 517         error = init_journal(sdp, undo);
 518         if (error)
 519                 goto fail_master;
 520
 521         /* Read in the master inode number inode */
 522         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 523         if (IS_ERR(sdp->sd_inum_inode)) {
 524                 error = PTR_ERR(sdp->sd_inum_inode);
 525                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 526                 goto fail_journal;
 527         }
 528
 529
 530         /* Read in the master statfs inode */
 531         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 532         if (IS_ERR(sdp->sd_statfs_inode)) {
 533                 error = PTR_ERR(sdp->sd_statfs_inode);
 534                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 535                 goto fail_inum;
 536         }
 537
 538         /* Read in the resource index inode */
 539         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 540         if (IS_ERR(sdp->sd_rindex)) {
 541                 error = PTR_ERR(sdp->sd_rindex);
 542                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 543                 goto fail_statfs;
 544         }
 545         ip = GFS2_I(sdp->sd_rindex);
 546         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 547         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 548
 549         /* Read in the quota inode */
 550         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 551         if (IS_ERR(sdp->sd_quota_inode)) {
 552                 error = PTR_ERR(sdp->sd_quota_inode);
 553                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 554                 goto fail_rindex;
 555         }
 556         return 0;
 557
 558 fail_qinode:
 559         iput(sdp->sd_quota_inode);
 560 fail_rindex:
 561         gfs2_clear_rgrpd(sdp);
 562         iput(sdp->sd_rindex);
 563 fail_statfs:
 564         iput(sdp->sd_statfs_inode);
 565 fail_inum:
 566         iput(sdp->sd_inum_inode);
 567 fail_journal:
 568         init_journal(sdp, UNDO);
 569 fail_master:
 570         iput(sdp->sd_master_dir);
 571 fail:
 572         return error;
 573 }
 574
 575 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 576 {
 577         struct inode *pn = NULL;
 578         char buf[30];
 579         int error = 0;
 580         struct gfs2_inode *ip;
 581
 582         if (sdp->sd_args.ar_spectator)
 583                 return 0;
 584
 585         if (undo)
 586                 goto fail_qc_gh;
 587
 588         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 589         if (IS_ERR(pn)) {
 590                 error = PTR_ERR(pn);
 591                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 592                 return error;
 593         }
 594
 595         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 596         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 597         if (IS_ERR(sdp->sd_ir_inode)) {
 598                 error = PTR_ERR(sdp->sd_ir_inode);
 599                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 600                 goto fail;
 601         }
 602
 603         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 604         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 605         if (IS_ERR(sdp->sd_sc_inode)) {
 606                 error = PTR_ERR(sdp->sd_sc_inode);
 607                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 608                 goto fail_ir_i;
 609         }
 610
 611         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 612         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 613         if (IS_ERR(sdp->sd_qc_inode)) {
 614                 error = PTR_ERR(sdp->sd_qc_inode);
 615                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 616                 goto fail_ut_i;
 617         }
 618
 619         iput(pn);
 620         pn = NULL;
 621
 622         ip = GFS2_I(sdp->sd_ir_inode);
 623         error = gfs2_glock_nq_init(ip->i_gl,
 624                                    LM_ST_EXCLUSIVE, 0,
 625                                    &sdp->sd_ir_gh);
 626         if (error) {
 627                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 628                 goto fail_qc_i;
 629         }
 630
 631         ip = GFS2_I(sdp->sd_sc_inode);
 632         error = gfs2_glock_nq_init(ip->i_gl,
 633                                    LM_ST_EXCLUSIVE, 0,
 634                                    &sdp->sd_sc_gh);
 635         if (error) {
 636                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 637                 goto fail_ir_gh;
 638         }
 639
 640         ip = GFS2_I(sdp->sd_qc_inode);
 641         error = gfs2_glock_nq_init(ip->i_gl,
 642                                    LM_ST_EXCLUSIVE, 0,
 643                                    &sdp->sd_qc_gh);
 644         if (error) {
 645                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 646                 goto fail_ut_gh;
 647         }
 648
 649         return 0;
 650
 651 fail_qc_gh:
 652         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 653 fail_ut_gh:
 654         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 655 fail_ir_gh:
 656         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 657 fail_qc_i:
 658         iput(sdp->sd_qc_inode);
 659 fail_ut_i:
 660         iput(sdp->sd_sc_inode);
 661 fail_ir_i:
 662         iput(sdp->sd_ir_inode);
 663 fail:
 664         if (pn)
 665                 iput(pn);
 666         return error;
 667 }
 668
 669 static int init_threads(struct gfs2_sbd *sdp, int undo)
 670 {
 671         struct task_struct *p;
 672         int error = 0;
 673
 674         if (undo)
 675                 goto fail_quotad;
 676
 677         sdp->sd_log_flush_time = jiffies;
 678         sdp->sd_jindex_refresh_time = jiffies;
 679
 680         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 681         error = IS_ERR(p);
 682         if (error) {
 683                 fs_err(sdp, "can't start logd thread: %d\n", error);
 684                 return error;
 685         }
 686         sdp->sd_logd_process = p;
 687
 688         sdp->sd_statfs_sync_time = jiffies;
 689         sdp->sd_quota_sync_time = jiffies;
 690
 691         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 692         error = IS_ERR(p);
 693         if (error) {
 694                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 695                 goto fail;
 696         }
 697         sdp->sd_quotad_process = p;
 698
 699         return 0;
 700
 701
 702 fail_quotad:
 703         kthread_stop(sdp->sd_quotad_process);
 704 fail:
 705         kthread_stop(sdp->sd_logd_process);
 706         return error;
 707 }
 708
 709 /**
 710  * fill_super - Read in superblock
 711  * @sb: The VFS superblock
 712  * @data: Mount options
 713  * @silent: Don't complain if it's not a GFS2 filesystem
 714  *
 715  * Returns: errno
 716  */
 717
 718 static int fill_super(struct super_block *sb, void *data, int silent)
 719 {
 720         struct gfs2_sbd *sdp;
 721         struct gfs2_holder mount_gh;
 722         int error;
 723
 724         sdp = init_sbd(sb);
 725         if (!sdp) {
 726                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 727                 return -ENOMEM;
 728         }
 729
 730         error = gfs2_mount_args(sdp, (char *)data, 0);
 731         if (error) {
 732                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 733                 goto fail;
 734         }
 735
 736         init_vfs(sb, SDF_NOATIME);
 737
 738         /* Set up the buffer cache and fill in some fake block size values
 739            to allow us to read-in the on-disk superblock. */
 740         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 741         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 742         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 743                                GFS2_BASIC_BLOCK_SHIFT;
 744         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 745
 746         error = init_names(sdp, silent);
 747         if (error)
 748                 goto fail;
 749
 750         gfs2_create_debugfs_file(sdp);
 751
 752         error = gfs2_sys_fs_add(sdp);
 753         if (error)
 754                 goto fail;
 755
 756         error = gfs2_lm_mount(sdp, silent);
 757         if (error)
 758                 goto fail_sys;
 759
 760         error = init_locking(sdp, &mount_gh, DO);
 761         if (error)
 762                 goto fail_lm;
 763
 764         error = init_sb(sdp, silent, DO);
 765         if (error)
 766                 goto fail_locking;
 767
 768         error = init_inodes(sdp, DO);
 769         if (error)
 770                 goto fail_sb;
 771
 772         error = init_per_node(sdp, DO);
 773         if (error)
 774                 goto fail_inodes;
 775
 776         error = gfs2_statfs_init(sdp);
 777         if (error) {
 778                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 779                 goto fail_per_node;
 780         }
 781
 782         error = init_threads(sdp, DO);
 783         if (error)
 784                 goto fail_per_node;
 785
 786         if (!(sb->s_flags & MS_RDONLY)) {
 787                 error = gfs2_make_fs_rw(sdp);
 788                 if (error) {
 789                         fs_err(sdp, "can't make FS RW: %d\n", error);
 790                         goto fail_threads;
 791                 }
 792         }
 793
 794         gfs2_glock_dq_uninit(&mount_gh);
 795
 796         return 0;
 797
 798 fail_threads:
 799         init_threads(sdp, UNDO);
 800 fail_per_node:
 801         init_per_node(sdp, UNDO);
 802 fail_inodes:
 803         init_inodes(sdp, UNDO);
 804 fail_sb:
 805         init_sb(sdp, 0, UNDO);
 806 fail_locking:
 807         init_locking(sdp, &mount_gh, UNDO);
 808 fail_lm:
 809         gfs2_gl_hash_clear(sdp, WAIT);
 810         gfs2_lm_unmount(sdp);
 811         while (invalidate_inodes(sb))
 812                 yield();
 813 fail_sys:
 814         gfs2_sys_fs_del(sdp);
 815 fail:
 816         gfs2_delete_debugfs_file(sdp);
 817         kfree(sdp);
 818         sb->s_fs_info = NULL;
 819         return error;
 820 }
 821
 822 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 823                 const char *dev_name, void *data, struct vfsmount *mnt)
 824 {
 825         struct super_block *sb;
 826         struct gfs2_sbd *sdp;
 827         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 828         if (error)
 829                 goto out;
 830         sb = mnt->mnt_sb;
 831         sdp = sb->s_fs_info;
 832         sdp->sd_gfs2mnt = mnt;
 833 out:
 834         return error;
 835 }
 836
 837 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 838                            void *data, int silent)
 839 {
 840         struct gfs2_sbd *sdp = sb->s_fs_info;
 841         struct inode *inode;
 842         int error = 0;
 843
 844         new->s_fs_info = sdp;
 845         sdp->sd_vfs_meta = sb;
 846
 847         init_vfs(new, SDF_NOATIME);
 848
 849         /* Get the master inode */
 850         inode = igrab(sdp->sd_master_dir);
 851
 852         new->s_root = d_alloc_root(inode);
 853         if (!new->s_root) {
 854                 fs_err(sdp, "can't get root dentry\n");
 855                 error = -ENOMEM;
 856                 iput(inode);
 857         } else
 858                 new->s_root->d_op = &gfs2_dops;
 859
 860         return error;
 861 }
 862
 863 static int set_bdev_super(struct super_block *s, void *data)
 864 {
 865         s->s_bdev = data;
 866         s->s_dev = s->s_bdev->bd_dev;
 867         return 0;
 868 }
 869
 870 static int test_bdev_super(struct super_block *s, void *data)
 871 {
 872         return s->s_bdev == data;
 873 }
 874
 875 static struct super_block* get_gfs2_sb(const char *dev_name)
 876 {
 877         struct kstat stat;
 878         struct nameidata nd;
 879         struct file_system_type *fstype;
 880         struct super_block *sb = NULL, *s;
 881         int error;
 882
 883         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 884         if (error) {
 885                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 886                        dev_name);
 887                 goto out;
 888         }
 889         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 890
 891         fstype = get_fs_type("gfs2");
 892         list_for_each_entry(s, &fstype->fs_supers, s_instances) {
 893                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 894                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 895                         sb = s;
 896                         goto free_nd;
 897                 }
 898         }
 899
 900         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 901                "mount point %s\n", dev_name);
 902
 903 free_nd:
 904         path_release(&nd);
 905 out:
 906         return sb;
 907 }
 908
 909 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 910                             const char *dev_name, void *data, struct vfsmount *mnt)
 911 {
 912         int error = 0;
 913         struct super_block *sb = NULL, *new;
 914         struct gfs2_sbd *sdp;
 915
 916         sb = get_gfs2_sb(dev_name);
 917         if (!sb) {
 918                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 919                 error = -ENOENT;
 920                 goto error;
 921         }
 922         sdp = sb->s_fs_info;
 923         if (sdp->sd_vfs_meta) {
 924                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 925                 error = -EBUSY;
 926                 goto error;
 927         }
 928         down(&sb->s_bdev->bd_mount_sem);
 929         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 930         up(&sb->s_bdev->bd_mount_sem);
 931         if (IS_ERR(new)) {
 932                 error = PTR_ERR(new);
 933                 goto error;
 934         }
 935         module_put(fs_type->owner);
 936         new->s_flags = flags;
 937         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 938         sb_set_blocksize(new, sb->s_blocksize);
 939         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 940         if (error) {
 941                 up_write(&new->s_umount);
 942                 deactivate_super(new);
 943                 goto error;
 944         }
 945
 946         new->s_flags |= MS_ACTIVE;
 947
 948         /* Grab a reference to the gfs2 mount point */
 949         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 950         return simple_set_mnt(mnt, new);
 951 error:
 952         return error;
 953 }
 954
 955 static void gfs2_kill_sb(struct super_block *sb)
 956 {
 957         if (sb->s_fs_info) {
 958                 gfs2_delete_debugfs_file(sb->s_fs_info);
 959                 gfs2_meta_syncfs(sb->s_fs_info);
 960         }
 961         kill_block_super(sb);
 962 }
 963
 964 static void gfs2_kill_sb_meta(struct super_block *sb)
 965 {
 966         struct gfs2_sbd *sdp = sb->s_fs_info;
 967         generic_shutdown_super(sb);
 968         sdp->sd_vfs_meta = NULL;
 969         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 970 }
 971
 972 struct file_system_type gfs2_fs_type = {
 973         .name = "gfs2",
 974         .fs_flags = FS_REQUIRES_DEV,
 975         .get_sb = gfs2_get_sb,
 976         .kill_sb = gfs2_kill_sb,
 977         .owner = THIS_MODULE,
 978 };
 979
 980 struct file_system_type gfs2meta_fs_type = {
 981         .name = "gfs2meta",
 982         .fs_flags = FS_REQUIRES_DEV,
 983         .get_sb = gfs2_get_sb_meta,
 984         .kill_sb = gfs2_kill_sb_meta,
 985         .owner = THIS_MODULE,
 986 };
 987