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