fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 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 "daemon.h"
  25 #include "glock.h"
  26 #include "glops.h"
  27 #include "inode.h"
  28 #include "lm.h"
  29 #include "mount.h"
  30 #include "ops_export.h"
  31 #include "ops_fstype.h"
  32 #include "ops_super.h"
  33 #include "recovery.h"
  34 #include "rgrp.h"
  35 #include "super.h"
  36 #include "sys.h"
  37 #include "util.h"
  38
  39 #define DO 0
  40 #define UNDO 1
  41
  42 extern struct dentry_operations gfs2_dops;
  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_gl);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  84         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  85         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  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         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
  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_maxbytes = MAX_LFS_FILESIZE;
 109
 110         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 111                 set_bit(noatime, &sdp->sd_flags);
 112
 113         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 114         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 115 }
 116
 117 static int init_names(struct gfs2_sbd *sdp, int silent)
 118 {
 119         struct gfs2_sb *sb = NULL;
 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                 struct buffer_head *bh;
 130                 bh = sb_getblk(sdp->sd_vfs,
 131                                GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 132                 lock_buffer(bh);
 133                 clear_buffer_uptodate(bh);
 134                 clear_buffer_dirty(bh);
 135                 unlock_buffer(bh);
 136                 ll_rw_block(READ, 1, &bh);
 137                 wait_on_buffer(bh);
 138
 139                 if (!buffer_uptodate(bh)) {
 140                         brelse(bh);
 141                         return -EIO;
 142                 }
 143
 144                 sb = kmalloc(sizeof(struct gfs2_sb), GFP_KERNEL);
 145                 if (!sb) {
 146                         brelse(bh);
 147                         return -ENOMEM;
 148                 }
 149                 gfs2_sb_in(sb, bh->b_data);
 150                 brelse(bh);
 151
 152                 error = gfs2_check_sb(sdp, sb, silent);
 153                 if (error)
 154                         goto out;
 155
 156                 if (!proto[0])
 157                         proto = sb->sb_lockproto;
 158                 if (!table[0])
 159                         table = sb->sb_locktable;
 160         }
 161
 162         if (!table[0])
 163                 table = sdp->sd_vfs->s_id;
 164
 165         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 166         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 167
 168 out:
 169         kfree(sb);
 170         return error;
 171 }
 172
 173 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 174                         int undo)
 175 {
 176         struct task_struct *p;
 177         int error = 0;
 178
 179         if (undo)
 180                 goto fail_trans;
 181
 182         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 183         error = IS_ERR(p);
 184         if (error) {
 185                 fs_err(sdp, "can't start scand thread: %d\n", error);
 186                 return error;
 187         }
 188         sdp->sd_scand_process = p;
 189
 190         for (sdp->sd_glockd_num = 0;
 191              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 192              sdp->sd_glockd_num++) {
 193                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 194                 error = IS_ERR(p);
 195                 if (error) {
 196                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 197                         goto fail;
 198                 }
 199                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 200         }
 201
 202         error = gfs2_glock_nq_num(sdp,
 203                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 204                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 205                                   mount_gh);
 206         if (error) {
 207                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 208                 goto fail;
 209         }
 210
 211         error = gfs2_glock_nq_num(sdp,
 212                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 213                                   LM_ST_SHARED,
 214                                   LM_FLAG_NOEXP | GL_EXACT,
 215                                   &sdp->sd_live_gh);
 216         if (error) {
 217                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 218                 goto fail_mount;
 219         }
 220
 221         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 222                                CREATE, &sdp->sd_rename_gl);
 223         if (error) {
 224                 fs_err(sdp, "can't create rename glock: %d\n", error);
 225                 goto fail_live;
 226         }
 227
 228         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 229                                CREATE, &sdp->sd_trans_gl);
 230         if (error) {
 231                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 232                 goto fail_rename;
 233         }
 234         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 235
 236         return 0;
 237
 238 fail_trans:
 239         gfs2_glock_put(sdp->sd_trans_gl);
 240 fail_rename:
 241         gfs2_glock_put(sdp->sd_rename_gl);
 242 fail_live:
 243         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 244 fail_mount:
 245         gfs2_glock_dq_uninit(mount_gh);
 246 fail:
 247         while (sdp->sd_glockd_num--)
 248                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 249
 250         kthread_stop(sdp->sd_scand_process);
 251         return error;
 252 }
 253
 254 static struct inode *gfs2_lookup_root(struct super_block *sb,
 255                                       struct gfs2_inum *inum)
 256 {
 257         return gfs2_inode_lookup(sb, inum, DT_DIR);
 258 }
 259
 260 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 261 {
 262         struct super_block *sb = sdp->sd_vfs;
 263         struct gfs2_holder sb_gh;
 264         struct gfs2_inum *inum;
 265         struct inode *inode;
 266         int error = 0;
 267
 268         if (undo) {
 269                 if (sb->s_root) {
 270                         dput(sb->s_root);
 271                         sb->s_root = NULL;
 272                 }
 273                 return 0;
 274         }
 275
 276         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 277                                  LM_ST_SHARED, 0, &sb_gh);
 278         if (error) {
 279                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 280                 return error;
 281         }
 282
 283         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 284         if (error) {
 285                 fs_err(sdp, "can't read superblock: %d\n", error);
 286                 goto out;
 287         }
 288
 289         /* Set up the buffer cache and SB for real */
 290         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 291                 error = -EINVAL;
 292                 fs_err(sdp, "FS block size (%u) is too small for device "
 293                        "block size (%u)\n",
 294                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 295                 goto out;
 296         }
 297         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 298                 error = -EINVAL;
 299                 fs_err(sdp, "FS block size (%u) is too big for machine "
 300                        "page size (%u)\n",
 301                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 302                 goto out;
 303         }
 304         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 305
 306         /* Get the root inode */
 307         inum = &sdp->sd_sb.sb_root_dir;
 308         if (sb->s_type == &gfs2meta_fs_type)
 309                 inum = &sdp->sd_sb.sb_master_dir;
 310         inode = gfs2_lookup_root(sb, inum);
 311         if (IS_ERR(inode)) {
 312                 error = PTR_ERR(inode);
 313                 fs_err(sdp, "can't read in root inode: %d\n", error);
 314                 goto out;
 315         }
 316
 317         sb->s_root = d_alloc_root(inode);
 318         if (!sb->s_root) {
 319                 fs_err(sdp, "can't get root dentry\n");
 320                 error = -ENOMEM;
 321                 iput(inode);
 322         }
 323         sb->s_root->d_op = &gfs2_dops;
 324 out:
 325         gfs2_glock_dq_uninit(&sb_gh);
 326         return error;
 327 }
 328
 329 static int init_journal(struct gfs2_sbd *sdp, int undo)
 330 {
 331         struct gfs2_holder ji_gh;
 332         struct task_struct *p;
 333         struct gfs2_inode *ip;
 334         int jindex = 1;
 335         int error = 0;
 336
 337         if (undo) {
 338                 jindex = 0;
 339                 goto fail_recoverd;
 340         }
 341
 342         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 343         if (IS_ERR(sdp->sd_jindex)) {
 344                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 345                 return PTR_ERR(sdp->sd_jindex);
 346         }
 347         ip = GFS2_I(sdp->sd_jindex);
 348         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 349
 350         /* Load in the journal index special file */
 351
 352         error = gfs2_jindex_hold(sdp, &ji_gh);
 353         if (error) {
 354                 fs_err(sdp, "can't read journal index: %d\n", error);
 355                 goto fail;
 356         }
 357
 358         error = -EINVAL;
 359         if (!gfs2_jindex_size(sdp)) {
 360                 fs_err(sdp, "no journals!\n");
 361                 goto fail_jindex;
 362         }
 363
 364         if (sdp->sd_args.ar_spectator) {
 365                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 366                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 367         } else {
 368                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 369                         fs_err(sdp, "can't mount journal #%u\n",
 370                                sdp->sd_lockstruct.ls_jid);
 371                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 372                                gfs2_jindex_size(sdp),
 373                                gfs2_jindex_size(sdp) - 1);
 374                         goto fail_jindex;
 375                 }
 376                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 377
 378                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 379                                           &gfs2_journal_glops,
 380                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 381                                           &sdp->sd_journal_gh);
 382                 if (error) {
 383                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 384                         goto fail_jindex;
 385                 }
 386
 387                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 388                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 389                                            LM_FLAG_NOEXP | GL_EXACT,
 390                                            &sdp->sd_jinode_gh);
 391                 if (error) {
 392                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 393                                error);
 394                         goto fail_journal_gh;
 395                 }
 396
 397                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 398                 if (error) {
 399                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 400                                sdp->sd_jdesc->jd_jid, error);
 401                         goto fail_jinode_gh;
 402                 }
 403                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 404         }
 405
 406         if (sdp->sd_lockstruct.ls_first) {
 407                 unsigned int x;
 408                 for (x = 0; x < sdp->sd_journals; x++) {
 409                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 410                         if (error) {
 411                                 fs_err(sdp, "error recovering journal %u: %d\n",
 412                                        x, error);
 413                                 goto fail_jinode_gh;
 414                         }
 415                 }
 416
 417                 gfs2_lm_others_may_mount(sdp);
 418         } else if (!sdp->sd_args.ar_spectator) {
 419                 error = gfs2_recover_journal(sdp->sd_jdesc);
 420                 if (error) {
 421                         fs_err(sdp, "error recovering my journal: %d\n", error);
 422                         goto fail_jinode_gh;
 423                 }
 424         }
 425
 426         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 427         gfs2_glock_dq_uninit(&ji_gh);
 428         jindex = 0;
 429
 430         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 431         error = IS_ERR(p);
 432         if (error) {
 433                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 434                 goto fail_jinode_gh;
 435         }
 436         sdp->sd_recoverd_process = p;
 437
 438         return 0;
 439
 440 fail_recoverd:
 441         kthread_stop(sdp->sd_recoverd_process);
 442 fail_jinode_gh:
 443         if (!sdp->sd_args.ar_spectator)
 444                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 445 fail_journal_gh:
 446         if (!sdp->sd_args.ar_spectator)
 447                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 448 fail_jindex:
 449         gfs2_jindex_free(sdp);
 450         if (jindex)
 451                 gfs2_glock_dq_uninit(&ji_gh);
 452 fail:
 453         iput(sdp->sd_jindex);
 454         return error;
 455 }
 456
 457
 458 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 459 {
 460         int error = 0;
 461         struct gfs2_inode *ip;
 462         struct inode *inode;
 463
 464         if (undo)
 465                 goto fail_qinode;
 466
 467         inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
 468         if (IS_ERR(inode)) {
 469                 error = PTR_ERR(inode);
 470                 fs_err(sdp, "can't read in master directory: %d\n", error);
 471                 goto fail;
 472         }
 473         sdp->sd_master_dir = inode;
 474
 475         error = init_journal(sdp, undo);
 476         if (error)
 477                 goto fail_master;
 478
 479         /* Read in the master inode number inode */
 480         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 481         if (IS_ERR(sdp->sd_inum_inode)) {
 482                 error = PTR_ERR(sdp->sd_inum_inode);
 483                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 484                 goto fail_journal;
 485         }
 486
 487
 488         /* Read in the master statfs inode */
 489         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 490         if (IS_ERR(sdp->sd_statfs_inode)) {
 491                 error = PTR_ERR(sdp->sd_statfs_inode);
 492                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 493                 goto fail_inum;
 494         }
 495
 496         /* Read in the resource index inode */
 497         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 498         if (IS_ERR(sdp->sd_rindex)) {
 499                 error = PTR_ERR(sdp->sd_rindex);
 500                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 501                 goto fail_statfs;
 502         }
 503         ip = GFS2_I(sdp->sd_rindex);
 504         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 505         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 506
 507         /* Read in the quota inode */
 508         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 509         if (IS_ERR(sdp->sd_quota_inode)) {
 510                 error = PTR_ERR(sdp->sd_quota_inode);
 511                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 512                 goto fail_rindex;
 513         }
 514         return 0;
 515
 516 fail_qinode:
 517         iput(sdp->sd_quota_inode);
 518 fail_rindex:
 519         gfs2_clear_rgrpd(sdp);
 520         iput(sdp->sd_rindex);
 521 fail_statfs:
 522         iput(sdp->sd_statfs_inode);
 523 fail_inum:
 524         iput(sdp->sd_inum_inode);
 525 fail_journal:
 526         init_journal(sdp, UNDO);
 527 fail_master:
 528         iput(sdp->sd_master_dir);
 529 fail:
 530         return error;
 531 }
 532
 533 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 534 {
 535         struct inode *pn = NULL;
 536         char buf[30];
 537         int error = 0;
 538         struct gfs2_inode *ip;
 539
 540         if (sdp->sd_args.ar_spectator)
 541                 return 0;
 542
 543         if (undo)
 544                 goto fail_qc_gh;
 545
 546         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 547         if (IS_ERR(pn)) {
 548                 error = PTR_ERR(pn);
 549                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 550                 return error;
 551         }
 552
 553         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 554         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 555         if (IS_ERR(sdp->sd_ir_inode)) {
 556                 error = PTR_ERR(sdp->sd_ir_inode);
 557                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 558                 goto fail;
 559         }
 560
 561         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 562         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 563         if (IS_ERR(sdp->sd_sc_inode)) {
 564                 error = PTR_ERR(sdp->sd_sc_inode);
 565                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 566                 goto fail_ir_i;
 567         }
 568
 569         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 570         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 571         if (IS_ERR(sdp->sd_qc_inode)) {
 572                 error = PTR_ERR(sdp->sd_qc_inode);
 573                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 574                 goto fail_ut_i;
 575         }
 576
 577         iput(pn);
 578         pn = NULL;
 579
 580         ip = GFS2_I(sdp->sd_ir_inode);
 581         error = gfs2_glock_nq_init(ip->i_gl,
 582                                    LM_ST_EXCLUSIVE, 0,
 583                                    &sdp->sd_ir_gh);
 584         if (error) {
 585                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 586                 goto fail_qc_i;
 587         }
 588
 589         ip = GFS2_I(sdp->sd_sc_inode);
 590         error = gfs2_glock_nq_init(ip->i_gl,
 591                                    LM_ST_EXCLUSIVE, 0,
 592                                    &sdp->sd_sc_gh);
 593         if (error) {
 594                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 595                 goto fail_ir_gh;
 596         }
 597
 598         ip = GFS2_I(sdp->sd_qc_inode);
 599         error = gfs2_glock_nq_init(ip->i_gl,
 600                                    LM_ST_EXCLUSIVE, 0,
 601                                    &sdp->sd_qc_gh);
 602         if (error) {
 603                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 604                 goto fail_ut_gh;
 605         }
 606
 607         return 0;
 608
 609 fail_qc_gh:
 610         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 611 fail_ut_gh:
 612         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 613 fail_ir_gh:
 614         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 615 fail_qc_i:
 616         iput(sdp->sd_qc_inode);
 617 fail_ut_i:
 618         iput(sdp->sd_sc_inode);
 619 fail_ir_i:
 620         iput(sdp->sd_ir_inode);
 621 fail:
 622         if (pn)
 623                 iput(pn);
 624         return error;
 625 }
 626
 627 static int init_threads(struct gfs2_sbd *sdp, int undo)
 628 {
 629         struct task_struct *p;
 630         int error = 0;
 631
 632         if (undo)
 633                 goto fail_quotad;
 634
 635         sdp->sd_log_flush_time = jiffies;
 636         sdp->sd_jindex_refresh_time = jiffies;
 637
 638         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 639         error = IS_ERR(p);
 640         if (error) {
 641                 fs_err(sdp, "can't start logd thread: %d\n", error);
 642                 return error;
 643         }
 644         sdp->sd_logd_process = p;
 645
 646         sdp->sd_statfs_sync_time = jiffies;
 647         sdp->sd_quota_sync_time = jiffies;
 648
 649         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 650         error = IS_ERR(p);
 651         if (error) {
 652                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 653                 goto fail;
 654         }
 655         sdp->sd_quotad_process = p;
 656
 657         return 0;
 658
 659
 660 fail_quotad:
 661         kthread_stop(sdp->sd_quotad_process);
 662 fail:
 663         kthread_stop(sdp->sd_logd_process);
 664         return error;
 665 }
 666
 667 /**
 668  * fill_super - Read in superblock
 669  * @sb: The VFS superblock
 670  * @data: Mount options
 671  * @silent: Don't complain if it's not a GFS2 filesystem
 672  *
 673  * Returns: errno
 674  */
 675
 676 static int fill_super(struct super_block *sb, void *data, int silent)
 677 {
 678         struct gfs2_sbd *sdp;
 679         struct gfs2_holder mount_gh;
 680         int error;
 681
 682         sdp = init_sbd(sb);
 683         if (!sdp) {
 684                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 685                 return -ENOMEM;
 686         }
 687
 688         error = gfs2_mount_args(sdp, (char *)data, 0);
 689         if (error) {
 690                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 691                 goto fail;
 692         }
 693
 694         init_vfs(sb, SDF_NOATIME);
 695
 696         /* Set up the buffer cache and fill in some fake block size values
 697            to allow us to read-in the on-disk superblock. */
 698         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 699         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 700         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 701                                GFS2_BASIC_BLOCK_SHIFT;
 702         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 703
 704         error = init_names(sdp, silent);
 705         if (error)
 706                 goto fail;
 707
 708         error = gfs2_sys_fs_add(sdp);
 709         if (error)
 710                 goto fail;
 711
 712         error = gfs2_lm_mount(sdp, silent);
 713         if (error)
 714                 goto fail_sys;
 715
 716         error = init_locking(sdp, &mount_gh, DO);
 717         if (error)
 718                 goto fail_lm;
 719
 720         error = init_sb(sdp, silent, DO);
 721         if (error)
 722                 goto fail_locking;
 723
 724         error = init_inodes(sdp, DO);
 725         if (error)
 726                 goto fail_sb;
 727
 728         error = init_per_node(sdp, DO);
 729         if (error)
 730                 goto fail_inodes;
 731
 732         error = gfs2_statfs_init(sdp);
 733         if (error) {
 734                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 735                 goto fail_per_node;
 736         }
 737
 738         error = init_threads(sdp, DO);
 739         if (error)
 740                 goto fail_per_node;
 741
 742         if (!(sb->s_flags & MS_RDONLY)) {
 743                 error = gfs2_make_fs_rw(sdp);
 744                 if (error) {
 745                         fs_err(sdp, "can't make FS RW: %d\n", error);
 746                         goto fail_threads;
 747                 }
 748         }
 749
 750         gfs2_glock_dq_uninit(&mount_gh);
 751
 752         return 0;
 753
 754 fail_threads:
 755         init_threads(sdp, UNDO);
 756 fail_per_node:
 757         init_per_node(sdp, UNDO);
 758 fail_inodes:
 759         init_inodes(sdp, UNDO);
 760 fail_sb:
 761         init_sb(sdp, 0, UNDO);
 762 fail_locking:
 763         init_locking(sdp, &mount_gh, UNDO);
 764 fail_lm:
 765         gfs2_gl_hash_clear(sdp, WAIT);
 766         gfs2_lm_unmount(sdp);
 767         while (invalidate_inodes(sb))
 768                 yield();
 769 fail_sys:
 770         gfs2_sys_fs_del(sdp);
 771 fail:
 772         kfree(sdp);
 773         sb->s_fs_info = NULL;
 774         return error;
 775 }
 776
 777 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 778                 const char *dev_name, void *data, struct vfsmount *mnt)
 779 {
 780         struct super_block *sb;
 781         struct gfs2_sbd *sdp;
 782         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 783         if (error)
 784                 goto out;
 785         sb = mnt->mnt_sb;
 786         sdp = sb->s_fs_info;
 787         sdp->sd_gfs2mnt = mnt;
 788 out:
 789         return error;
 790 }
 791
 792 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 793                            void *data, int silent)
 794 {
 795         struct gfs2_sbd *sdp = sb->s_fs_info;
 796         struct inode *inode;
 797         int error = 0;
 798
 799         new->s_fs_info = sdp;
 800         sdp->sd_vfs_meta = sb;
 801
 802         init_vfs(new, SDF_NOATIME);
 803
 804         /* Get the master inode */
 805         inode = igrab(sdp->sd_master_dir);
 806
 807         new->s_root = d_alloc_root(inode);
 808         if (!new->s_root) {
 809                 fs_err(sdp, "can't get root dentry\n");
 810                 error = -ENOMEM;
 811                 iput(inode);
 812         }
 813         new->s_root->d_op = &gfs2_dops;
 814
 815         return error;
 816 }
 817
 818 static int set_bdev_super(struct super_block *s, void *data)
 819 {
 820         s->s_bdev = data;
 821         s->s_dev = s->s_bdev->bd_dev;
 822         return 0;
 823 }
 824
 825 static int test_bdev_super(struct super_block *s, void *data)
 826 {
 827         return s->s_bdev == data;
 828 }
 829
 830 static struct super_block* get_gfs2_sb(const char *dev_name)
 831 {
 832         struct kstat stat;
 833         struct nameidata nd;
 834         struct file_system_type *fstype;
 835         struct super_block *sb = NULL, *s;
 836         struct list_head *l;
 837         int error;
 838
 839         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 840         if (error) {
 841                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 842                        dev_name);
 843                 goto out;
 844         }
 845         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 846
 847         fstype = get_fs_type("gfs2");
 848         list_for_each(l, &fstype->fs_supers) {
 849                 s = list_entry(l, struct super_block, s_instances);
 850                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 851                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 852                         sb = s;
 853                         goto free_nd;
 854                 }
 855         }
 856
 857         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 858                "mount point %s", dev_name);
 859
 860 free_nd:
 861         path_release(&nd);
 862 out:
 863         return sb;
 864 }
 865
 866 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 867                             const char *dev_name, void *data, struct vfsmount *mnt)
 868 {
 869         int error = 0;
 870         struct super_block *sb = NULL, *new;
 871         struct gfs2_sbd *sdp;
 872         char *gfs2mnt = NULL;
 873
 874         sb = get_gfs2_sb(dev_name);
 875         if (!sb) {
 876                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 877                 error = -ENOENT;
 878                 goto error;
 879         }
 880         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 881         if (sdp->sd_vfs_meta) {
 882                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 883                 error = -EBUSY;
 884                 goto error;
 885         }
 886         mutex_lock(&sb->s_bdev->bd_mount_mutex);
 887         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 888         mutex_unlock(&sb->s_bdev->bd_mount_mutex);
 889         if (IS_ERR(new)) {
 890                 error = PTR_ERR(new);
 891                 goto error;
 892         }
 893         module_put(fs_type->owner);
 894         new->s_flags = flags;
 895         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 896         sb_set_blocksize(new, sb->s_blocksize);
 897         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 898         if (error) {
 899                 up_write(&new->s_umount);
 900                 deactivate_super(new);
 901                 goto error;
 902         }
 903
 904         new->s_flags |= MS_ACTIVE;
 905
 906         /* Grab a reference to the gfs2 mount point */
 907         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 908         return simple_set_mnt(mnt, new);
 909 error:
 910         if (gfs2mnt)
 911                 kfree(gfs2mnt);
 912         return error;
 913 }
 914
 915 static void gfs2_kill_sb(struct super_block *sb)
 916 {
 917         kill_block_super(sb);
 918 }
 919
 920 static void gfs2_kill_sb_meta(struct super_block *sb)
 921 {
 922         struct gfs2_sbd *sdp = sb->s_fs_info;
 923         generic_shutdown_super(sb);
 924         sdp->sd_vfs_meta = NULL;
 925         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 926 }
 927
 928 struct file_system_type gfs2_fs_type = {
 929         .name = "gfs2",
 930         .fs_flags = FS_REQUIRES_DEV,
 931         .get_sb = gfs2_get_sb,
 932         .kill_sb = gfs2_kill_sb,
 933         .owner = THIS_MODULE,
 934 };
 935
 936 struct file_system_type gfs2meta_fs_type = {
 937         .name = "gfs2meta",
 938         .fs_flags = FS_REQUIRES_DEV,
 939         .get_sb = gfs2_get_sb_meta,
 940         .kill_sb = gfs2_kill_sb_meta,
 941         .owner = THIS_MODULE,
 942 };
 943