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