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_super.h"
  32 #include "recovery.h"
  33 #include "rgrp.h"
  34 #include "super.h"
  35 #include "sys.h"
  36 #include "util.h"
  37
  38 #define DO 0
  39 #define UNDO 1
  40
  41 extern struct dentry_operations gfs2_dops;
  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
  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         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
  92
  93         INIT_LIST_HEAD(&sdp->sd_revoke_list);
  94
  95         mutex_init(&sdp->sd_freeze_lock);
  96
  97         return sdp;
  98 }
  99
 100 static void init_vfs(struct super_block *sb, unsigned noatime)
 101 {
 102         struct gfs2_sbd *sdp = sb->s_fs_info;
 103
 104         sb->s_magic = GFS2_MAGIC;
 105         sb->s_op = &gfs2_super_ops;
 106         sb->s_export_op = &gfs2_export_ops;
 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 out:
 148         return error;
 149 }
 150
 151 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 152                         int undo)
 153 {
 154         struct task_struct *p;
 155         int error = 0;
 156
 157         if (undo)
 158                 goto fail_trans;
 159
 160         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 161         error = IS_ERR(p);
 162         if (error) {
 163                 fs_err(sdp, "can't start scand thread: %d\n", error);
 164                 return error;
 165         }
 166         sdp->sd_scand_process = p;
 167
 168         for (sdp->sd_glockd_num = 0;
 169              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 170              sdp->sd_glockd_num++) {
 171                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 172                 error = IS_ERR(p);
 173                 if (error) {
 174                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 175                         goto fail;
 176                 }
 177                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 178         }
 179
 180         error = gfs2_glock_nq_num(sdp,
 181                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 182                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 183                                   mount_gh);
 184         if (error) {
 185                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 186                 goto fail;
 187         }
 188
 189         error = gfs2_glock_nq_num(sdp,
 190                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 191                                   LM_ST_SHARED,
 192                                   LM_FLAG_NOEXP | GL_EXACT,
 193                                   &sdp->sd_live_gh);
 194         if (error) {
 195                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 196                 goto fail_mount;
 197         }
 198
 199         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 200                                CREATE, &sdp->sd_rename_gl);
 201         if (error) {
 202                 fs_err(sdp, "can't create rename glock: %d\n", error);
 203                 goto fail_live;
 204         }
 205
 206         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 207                                CREATE, &sdp->sd_trans_gl);
 208         if (error) {
 209                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 210                 goto fail_rename;
 211         }
 212         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 213
 214         return 0;
 215
 216 fail_trans:
 217         gfs2_glock_put(sdp->sd_trans_gl);
 218 fail_rename:
 219         gfs2_glock_put(sdp->sd_rename_gl);
 220 fail_live:
 221         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 222 fail_mount:
 223         gfs2_glock_dq_uninit(mount_gh);
 224 fail:
 225         while (sdp->sd_glockd_num--)
 226                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 227
 228         kthread_stop(sdp->sd_scand_process);
 229         return error;
 230 }
 231
 232 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 233                                              u64 no_addr)
 234 {
 235         return gfs2_inode_lookup(sb, no_addr, DT_DIR);
 236 }
 237
 238 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 239 {
 240         struct super_block *sb = sdp->sd_vfs;
 241         struct gfs2_holder sb_gh;
 242         u64 no_addr;
 243         struct inode *inode;
 244         int error = 0;
 245
 246         if (undo) {
 247                 if (sb->s_root) {
 248                         dput(sb->s_root);
 249                         sb->s_root = NULL;
 250                 }
 251                 return 0;
 252         }
 253
 254         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 255                                  LM_ST_SHARED, 0, &sb_gh);
 256         if (error) {
 257                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 258                 return error;
 259         }
 260
 261         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 262         if (error) {
 263                 fs_err(sdp, "can't read superblock: %d\n", error);
 264                 goto out;
 265         }
 266
 267         /* Set up the buffer cache and SB for real */
 268         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 269                 error = -EINVAL;
 270                 fs_err(sdp, "FS block size (%u) is too small for device "
 271                        "block size (%u)\n",
 272                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 273                 goto out;
 274         }
 275         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 276                 error = -EINVAL;
 277                 fs_err(sdp, "FS block size (%u) is too big for machine "
 278                        "page size (%u)\n",
 279                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 280                 goto out;
 281         }
 282         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 283
 284         /* Get the root inode */
 285         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 286         if (sb->s_type == &gfs2meta_fs_type)
 287                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 288         inode = gfs2_lookup_root(sb, no_addr);
 289         if (IS_ERR(inode)) {
 290                 error = PTR_ERR(inode);
 291                 fs_err(sdp, "can't read in root inode: %d\n", error);
 292                 goto out;
 293         }
 294
 295         sb->s_root = d_alloc_root(inode);
 296         if (!sb->s_root) {
 297                 fs_err(sdp, "can't get root dentry\n");
 298                 error = -ENOMEM;
 299                 iput(inode);
 300         }
 301         sb->s_root->d_op = &gfs2_dops;
 302 out:
 303         gfs2_glock_dq_uninit(&sb_gh);
 304         return error;
 305 }
 306
 307 static int init_journal(struct gfs2_sbd *sdp, int undo)
 308 {
 309         struct gfs2_holder ji_gh;
 310         struct task_struct *p;
 311         struct gfs2_inode *ip;
 312         int jindex = 1;
 313         int error = 0;
 314
 315         if (undo) {
 316                 jindex = 0;
 317                 goto fail_recoverd;
 318         }
 319
 320         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 321         if (IS_ERR(sdp->sd_jindex)) {
 322                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 323                 return PTR_ERR(sdp->sd_jindex);
 324         }
 325         ip = GFS2_I(sdp->sd_jindex);
 326         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 327
 328         /* Load in the journal index special file */
 329
 330         error = gfs2_jindex_hold(sdp, &ji_gh);
 331         if (error) {
 332                 fs_err(sdp, "can't read journal index: %d\n", error);
 333                 goto fail;
 334         }
 335
 336         error = -EINVAL;
 337         if (!gfs2_jindex_size(sdp)) {
 338                 fs_err(sdp, "no journals!\n");
 339                 goto fail_jindex;
 340         }
 341
 342         if (sdp->sd_args.ar_spectator) {
 343                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 344                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 345         } else {
 346                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 347                         fs_err(sdp, "can't mount journal #%u\n",
 348                                sdp->sd_lockstruct.ls_jid);
 349                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 350                                gfs2_jindex_size(sdp),
 351                                gfs2_jindex_size(sdp) - 1);
 352                         goto fail_jindex;
 353                 }
 354                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 355
 356                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 357                                           &gfs2_journal_glops,
 358                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 359                                           &sdp->sd_journal_gh);
 360                 if (error) {
 361                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 362                         goto fail_jindex;
 363                 }
 364
 365                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 366                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 367                                            LM_FLAG_NOEXP | GL_EXACT,
 368                                            &sdp->sd_jinode_gh);
 369                 if (error) {
 370                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 371                                error);
 372                         goto fail_journal_gh;
 373                 }
 374
 375                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 376                 if (error) {
 377                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 378                                sdp->sd_jdesc->jd_jid, error);
 379                         goto fail_jinode_gh;
 380                 }
 381                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 382         }
 383
 384         if (sdp->sd_lockstruct.ls_first) {
 385                 unsigned int x;
 386                 for (x = 0; x < sdp->sd_journals; x++) {
 387                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 388                         if (error) {
 389                                 fs_err(sdp, "error recovering journal %u: %d\n",
 390                                        x, error);
 391                                 goto fail_jinode_gh;
 392                         }
 393                 }
 394
 395                 gfs2_lm_others_may_mount(sdp);
 396         } else if (!sdp->sd_args.ar_spectator) {
 397                 error = gfs2_recover_journal(sdp->sd_jdesc);
 398                 if (error) {
 399                         fs_err(sdp, "error recovering my journal: %d\n", error);
 400                         goto fail_jinode_gh;
 401                 }
 402         }
 403
 404         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 405         gfs2_glock_dq_uninit(&ji_gh);
 406         jindex = 0;
 407
 408         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 409         error = IS_ERR(p);
 410         if (error) {
 411                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 412                 goto fail_jinode_gh;
 413         }
 414         sdp->sd_recoverd_process = p;
 415
 416         return 0;
 417
 418 fail_recoverd:
 419         kthread_stop(sdp->sd_recoverd_process);
 420 fail_jinode_gh:
 421         if (!sdp->sd_args.ar_spectator)
 422                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 423 fail_journal_gh:
 424         if (!sdp->sd_args.ar_spectator)
 425                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 426 fail_jindex:
 427         gfs2_jindex_free(sdp);
 428         if (jindex)
 429                 gfs2_glock_dq_uninit(&ji_gh);
 430 fail:
 431         iput(sdp->sd_jindex);
 432         return error;
 433 }
 434
 435
 436 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 437 {
 438         int error = 0;
 439         struct gfs2_inode *ip;
 440         struct inode *inode;
 441
 442         if (undo)
 443                 goto fail_qinode;
 444
 445         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 446         if (IS_ERR(inode)) {
 447                 error = PTR_ERR(inode);
 448                 fs_err(sdp, "can't read in master directory: %d\n", error);
 449                 goto fail;
 450         }
 451         sdp->sd_master_dir = inode;
 452
 453         error = init_journal(sdp, undo);
 454         if (error)
 455                 goto fail_master;
 456
 457         /* Read in the master inode number inode */
 458         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 459         if (IS_ERR(sdp->sd_inum_inode)) {
 460                 error = PTR_ERR(sdp->sd_inum_inode);
 461                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 462                 goto fail_journal;
 463         }
 464
 465
 466         /* Read in the master statfs inode */
 467         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 468         if (IS_ERR(sdp->sd_statfs_inode)) {
 469                 error = PTR_ERR(sdp->sd_statfs_inode);
 470                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 471                 goto fail_inum;
 472         }
 473
 474         /* Read in the resource index inode */
 475         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 476         if (IS_ERR(sdp->sd_rindex)) {
 477                 error = PTR_ERR(sdp->sd_rindex);
 478                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 479                 goto fail_statfs;
 480         }
 481         ip = GFS2_I(sdp->sd_rindex);
 482         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 483         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 484
 485         /* Read in the quota inode */
 486         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 487         if (IS_ERR(sdp->sd_quota_inode)) {
 488                 error = PTR_ERR(sdp->sd_quota_inode);
 489                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 490                 goto fail_rindex;
 491         }
 492         return 0;
 493
 494 fail_qinode:
 495         iput(sdp->sd_quota_inode);
 496 fail_rindex:
 497         gfs2_clear_rgrpd(sdp);
 498         iput(sdp->sd_rindex);
 499 fail_statfs:
 500         iput(sdp->sd_statfs_inode);
 501 fail_inum:
 502         iput(sdp->sd_inum_inode);
 503 fail_journal:
 504         init_journal(sdp, UNDO);
 505 fail_master:
 506         iput(sdp->sd_master_dir);
 507 fail:
 508         return error;
 509 }
 510
 511 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 512 {
 513         struct inode *pn = NULL;
 514         char buf[30];
 515         int error = 0;
 516         struct gfs2_inode *ip;
 517
 518         if (sdp->sd_args.ar_spectator)
 519                 return 0;
 520
 521         if (undo)
 522                 goto fail_qc_gh;
 523
 524         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 525         if (IS_ERR(pn)) {
 526                 error = PTR_ERR(pn);
 527                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 528                 return error;
 529         }
 530
 531         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 532         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 533         if (IS_ERR(sdp->sd_ir_inode)) {
 534                 error = PTR_ERR(sdp->sd_ir_inode);
 535                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 536                 goto fail;
 537         }
 538
 539         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 540         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 541         if (IS_ERR(sdp->sd_sc_inode)) {
 542                 error = PTR_ERR(sdp->sd_sc_inode);
 543                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 544                 goto fail_ir_i;
 545         }
 546
 547         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 548         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 549         if (IS_ERR(sdp->sd_qc_inode)) {
 550                 error = PTR_ERR(sdp->sd_qc_inode);
 551                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 552                 goto fail_ut_i;
 553         }
 554
 555         iput(pn);
 556         pn = NULL;
 557
 558         ip = GFS2_I(sdp->sd_ir_inode);
 559         error = gfs2_glock_nq_init(ip->i_gl,
 560                                    LM_ST_EXCLUSIVE, 0,
 561                                    &sdp->sd_ir_gh);
 562         if (error) {
 563                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 564                 goto fail_qc_i;
 565         }
 566
 567         ip = GFS2_I(sdp->sd_sc_inode);
 568         error = gfs2_glock_nq_init(ip->i_gl,
 569                                    LM_ST_EXCLUSIVE, 0,
 570                                    &sdp->sd_sc_gh);
 571         if (error) {
 572                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 573                 goto fail_ir_gh;
 574         }
 575
 576         ip = GFS2_I(sdp->sd_qc_inode);
 577         error = gfs2_glock_nq_init(ip->i_gl,
 578                                    LM_ST_EXCLUSIVE, 0,
 579                                    &sdp->sd_qc_gh);
 580         if (error) {
 581                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 582                 goto fail_ut_gh;
 583         }
 584
 585         return 0;
 586
 587 fail_qc_gh:
 588         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 589 fail_ut_gh:
 590         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 591 fail_ir_gh:
 592         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 593 fail_qc_i:
 594         iput(sdp->sd_qc_inode);
 595 fail_ut_i:
 596         iput(sdp->sd_sc_inode);
 597 fail_ir_i:
 598         iput(sdp->sd_ir_inode);
 599 fail:
 600         if (pn)
 601                 iput(pn);
 602         return error;
 603 }
 604
 605 static int init_threads(struct gfs2_sbd *sdp, int undo)
 606 {
 607         struct task_struct *p;
 608         int error = 0;
 609
 610         if (undo)
 611                 goto fail_quotad;
 612
 613         sdp->sd_log_flush_time = jiffies;
 614         sdp->sd_jindex_refresh_time = jiffies;
 615
 616         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 617         error = IS_ERR(p);
 618         if (error) {
 619                 fs_err(sdp, "can't start logd thread: %d\n", error);
 620                 return error;
 621         }
 622         sdp->sd_logd_process = p;
 623
 624         sdp->sd_statfs_sync_time = jiffies;
 625         sdp->sd_quota_sync_time = jiffies;
 626
 627         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 628         error = IS_ERR(p);
 629         if (error) {
 630                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 631                 goto fail;
 632         }
 633         sdp->sd_quotad_process = p;
 634
 635         return 0;
 636
 637
 638 fail_quotad:
 639         kthread_stop(sdp->sd_quotad_process);
 640 fail:
 641         kthread_stop(sdp->sd_logd_process);
 642         return error;
 643 }
 644
 645 /**
 646  * fill_super - Read in superblock
 647  * @sb: The VFS superblock
 648  * @data: Mount options
 649  * @silent: Don't complain if it's not a GFS2 filesystem
 650  *
 651  * Returns: errno
 652  */
 653
 654 static int fill_super(struct super_block *sb, void *data, int silent)
 655 {
 656         struct gfs2_sbd *sdp;
 657         struct gfs2_holder mount_gh;
 658         int error;
 659
 660         sdp = init_sbd(sb);
 661         if (!sdp) {
 662                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 663                 return -ENOMEM;
 664         }
 665
 666         error = gfs2_mount_args(sdp, (char *)data, 0);
 667         if (error) {
 668                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 669                 goto fail;
 670         }
 671
 672         init_vfs(sb, SDF_NOATIME);
 673
 674         /* Set up the buffer cache and fill in some fake block size values
 675            to allow us to read-in the on-disk superblock. */
 676         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 677         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 678         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 679                                GFS2_BASIC_BLOCK_SHIFT;
 680         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 681
 682         error = init_names(sdp, silent);
 683         if (error)
 684                 goto fail;
 685
 686         gfs2_create_debugfs_file(sdp);
 687
 688         error = gfs2_sys_fs_add(sdp);
 689         if (error)
 690                 goto fail;
 691
 692         error = gfs2_lm_mount(sdp, silent);
 693         if (error)
 694                 goto fail_sys;
 695
 696         error = init_locking(sdp, &mount_gh, DO);
 697         if (error)
 698                 goto fail_lm;
 699
 700         error = init_sb(sdp, silent, DO);
 701         if (error)
 702                 goto fail_locking;
 703
 704         error = init_inodes(sdp, DO);
 705         if (error)
 706                 goto fail_sb;
 707
 708         error = init_per_node(sdp, DO);
 709         if (error)
 710                 goto fail_inodes;
 711
 712         error = gfs2_statfs_init(sdp);
 713         if (error) {
 714                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 715                 goto fail_per_node;
 716         }
 717
 718         error = init_threads(sdp, DO);
 719         if (error)
 720                 goto fail_per_node;
 721
 722         if (!(sb->s_flags & MS_RDONLY)) {
 723                 error = gfs2_make_fs_rw(sdp);
 724                 if (error) {
 725                         fs_err(sdp, "can't make FS RW: %d\n", error);
 726                         goto fail_threads;
 727                 }
 728         }
 729
 730         gfs2_glock_dq_uninit(&mount_gh);
 731
 732         return 0;
 733
 734 fail_threads:
 735         init_threads(sdp, UNDO);
 736 fail_per_node:
 737         init_per_node(sdp, UNDO);
 738 fail_inodes:
 739         init_inodes(sdp, UNDO);
 740 fail_sb:
 741         init_sb(sdp, 0, UNDO);
 742 fail_locking:
 743         init_locking(sdp, &mount_gh, UNDO);
 744 fail_lm:
 745         gfs2_gl_hash_clear(sdp, WAIT);
 746         gfs2_lm_unmount(sdp);
 747         while (invalidate_inodes(sb))
 748                 yield();
 749 fail_sys:
 750         gfs2_sys_fs_del(sdp);
 751 fail:
 752         gfs2_delete_debugfs_file(sdp);
 753         kfree(sdp);
 754         sb->s_fs_info = NULL;
 755         return error;
 756 }
 757
 758 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 759                 const char *dev_name, void *data, struct vfsmount *mnt)
 760 {
 761         struct super_block *sb;
 762         struct gfs2_sbd *sdp;
 763         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 764         if (error)
 765                 goto out;
 766         sb = mnt->mnt_sb;
 767         sdp = sb->s_fs_info;
 768         sdp->sd_gfs2mnt = mnt;
 769 out:
 770         return error;
 771 }
 772
 773 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 774                            void *data, int silent)
 775 {
 776         struct gfs2_sbd *sdp = sb->s_fs_info;
 777         struct inode *inode;
 778         int error = 0;
 779
 780         new->s_fs_info = sdp;
 781         sdp->sd_vfs_meta = sb;
 782
 783         init_vfs(new, SDF_NOATIME);
 784
 785         /* Get the master inode */
 786         inode = igrab(sdp->sd_master_dir);
 787
 788         new->s_root = d_alloc_root(inode);
 789         if (!new->s_root) {
 790                 fs_err(sdp, "can't get root dentry\n");
 791                 error = -ENOMEM;
 792                 iput(inode);
 793         } else
 794                 new->s_root->d_op = &gfs2_dops;
 795
 796         return error;
 797 }
 798
 799 static int set_bdev_super(struct super_block *s, void *data)
 800 {
 801         s->s_bdev = data;
 802         s->s_dev = s->s_bdev->bd_dev;
 803         return 0;
 804 }
 805
 806 static int test_bdev_super(struct super_block *s, void *data)
 807 {
 808         return s->s_bdev == data;
 809 }
 810
 811 static struct super_block* get_gfs2_sb(const char *dev_name)
 812 {
 813         struct kstat stat;
 814         struct nameidata nd;
 815         struct file_system_type *fstype;
 816         struct super_block *sb = NULL, *s;
 817         struct list_head *l;
 818         int error;
 819
 820         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 821         if (error) {
 822                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 823                        dev_name);
 824                 goto out;
 825         }
 826         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 827
 828         fstype = get_fs_type("gfs2");
 829         list_for_each(l, &fstype->fs_supers) {
 830                 s = list_entry(l, struct super_block, s_instances);
 831                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 832                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 833                         sb = s;
 834                         goto free_nd;
 835                 }
 836         }
 837
 838         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 839                "mount point %s\n", dev_name);
 840
 841 free_nd:
 842         path_release(&nd);
 843 out:
 844         return sb;
 845 }
 846
 847 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 848                             const char *dev_name, void *data, struct vfsmount *mnt)
 849 {
 850         int error = 0;
 851         struct super_block *sb = NULL, *new;
 852         struct gfs2_sbd *sdp;
 853
 854         sb = get_gfs2_sb(dev_name);
 855         if (!sb) {
 856                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 857                 error = -ENOENT;
 858                 goto error;
 859         }
 860         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 861         if (sdp->sd_vfs_meta) {
 862                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 863                 error = -EBUSY;
 864                 goto error;
 865         }
 866         down(&sb->s_bdev->bd_mount_sem);
 867         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 868         up(&sb->s_bdev->bd_mount_sem);
 869         if (IS_ERR(new)) {
 870                 error = PTR_ERR(new);
 871                 goto error;
 872         }
 873         module_put(fs_type->owner);
 874         new->s_flags = flags;
 875         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 876         sb_set_blocksize(new, sb->s_blocksize);
 877         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 878         if (error) {
 879                 up_write(&new->s_umount);
 880                 deactivate_super(new);
 881                 goto error;
 882         }
 883
 884         new->s_flags |= MS_ACTIVE;
 885
 886         /* Grab a reference to the gfs2 mount point */
 887         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 888         return simple_set_mnt(mnt, new);
 889 error:
 890         return error;
 891 }
 892
 893 static void gfs2_kill_sb(struct super_block *sb)
 894 {
 895         gfs2_delete_debugfs_file(sb->s_fs_info);
 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