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