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