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_time_gran = 1;
 108         sb->s_maxbytes = MAX_LFS_FILESIZE;
 109
 110         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 111                 set_bit(noatime, &sdp->sd_flags);
 112
 113         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 114         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 115 }
 116
 117 static int init_names(struct gfs2_sbd *sdp, int silent)
 118 {
 119         char *proto, *table;
 120         int error = 0;
 121
 122         proto = sdp->sd_args.ar_lockproto;
 123         table = sdp->sd_args.ar_locktable;
 124
 125         /*  Try to autodetect  */
 126
 127         if (!proto[0] || !table[0]) {
 128                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 129                 if (error)
 130                         return error;
 131
 132                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 133                 if (error)
 134                         goto out;
 135
 136                 if (!proto[0])
 137                         proto = sdp->sd_sb.sb_lockproto;
 138                 if (!table[0])
 139                         table = sdp->sd_sb.sb_locktable;
 140         }
 141
 142         if (!table[0])
 143                 table = sdp->sd_vfs->s_id;
 144
 145         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 146         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 147
 148 out:
 149         return error;
 150 }
 151
 152 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 153                         int undo)
 154 {
 155         struct task_struct *p;
 156         int error = 0;
 157
 158         if (undo)
 159                 goto fail_trans;
 160
 161         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 162         error = IS_ERR(p);
 163         if (error) {
 164                 fs_err(sdp, "can't start scand thread: %d\n", error);
 165                 return error;
 166         }
 167         sdp->sd_scand_process = p;
 168
 169         for (sdp->sd_glockd_num = 0;
 170              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 171              sdp->sd_glockd_num++) {
 172                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 173                 error = IS_ERR(p);
 174                 if (error) {
 175                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 176                         goto fail;
 177                 }
 178                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 179         }
 180
 181         error = gfs2_glock_nq_num(sdp,
 182                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 183                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 184                                   mount_gh);
 185         if (error) {
 186                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 187                 goto fail;
 188         }
 189
 190         error = gfs2_glock_nq_num(sdp,
 191                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 192                                   LM_ST_SHARED,
 193                                   LM_FLAG_NOEXP | GL_EXACT,
 194                                   &sdp->sd_live_gh);
 195         if (error) {
 196                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 197                 goto fail_mount;
 198         }
 199
 200         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 201                                CREATE, &sdp->sd_rename_gl);
 202         if (error) {
 203                 fs_err(sdp, "can't create rename glock: %d\n", error);
 204                 goto fail_live;
 205         }
 206
 207         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 208                                CREATE, &sdp->sd_trans_gl);
 209         if (error) {
 210                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 211                 goto fail_rename;
 212         }
 213         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 214
 215         return 0;
 216
 217 fail_trans:
 218         gfs2_glock_put(sdp->sd_trans_gl);
 219 fail_rename:
 220         gfs2_glock_put(sdp->sd_rename_gl);
 221 fail_live:
 222         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 223 fail_mount:
 224         gfs2_glock_dq_uninit(mount_gh);
 225 fail:
 226         while (sdp->sd_glockd_num--)
 227                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 228
 229         kthread_stop(sdp->sd_scand_process);
 230         return error;
 231 }
 232
 233 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 234                                              u64 no_addr)
 235 {
 236         return gfs2_inode_lookup(sb, no_addr, DT_DIR);
 237 }
 238
 239 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 240 {
 241         struct super_block *sb = sdp->sd_vfs;
 242         struct gfs2_holder sb_gh;
 243         u64 no_addr;
 244         struct inode *inode;
 245         int error = 0;
 246
 247         if (undo) {
 248                 if (sb->s_root) {
 249                         dput(sb->s_root);
 250                         sb->s_root = NULL;
 251                 }
 252                 return 0;
 253         }
 254
 255         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 256                                  LM_ST_SHARED, 0, &sb_gh);
 257         if (error) {
 258                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 259                 return error;
 260         }
 261
 262         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 263         if (error) {
 264                 fs_err(sdp, "can't read superblock: %d\n", error);
 265                 goto out;
 266         }
 267
 268         /* Set up the buffer cache and SB for real */
 269         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 270                 error = -EINVAL;
 271                 fs_err(sdp, "FS block size (%u) is too small for device "
 272                        "block size (%u)\n",
 273                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 274                 goto out;
 275         }
 276         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 277                 error = -EINVAL;
 278                 fs_err(sdp, "FS block size (%u) is too big for machine "
 279                        "page size (%u)\n",
 280                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 281                 goto out;
 282         }
 283         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 284
 285         /* Get the root inode */
 286         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 287         if (sb->s_type == &gfs2meta_fs_type)
 288                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 289         inode = gfs2_lookup_root(sb, no_addr);
 290         if (IS_ERR(inode)) {
 291                 error = PTR_ERR(inode);
 292                 fs_err(sdp, "can't read in root inode: %d\n", error);
 293                 goto out;
 294         }
 295
 296         sb->s_root = d_alloc_root(inode);
 297         if (!sb->s_root) {
 298                 fs_err(sdp, "can't get root dentry\n");
 299                 error = -ENOMEM;
 300                 iput(inode);
 301         }
 302         sb->s_root->d_op = &gfs2_dops;
 303 out:
 304         gfs2_glock_dq_uninit(&sb_gh);
 305         return error;
 306 }
 307
 308 static int init_journal(struct gfs2_sbd *sdp, int undo)
 309 {
 310         struct gfs2_holder ji_gh;
 311         struct task_struct *p;
 312         struct gfs2_inode *ip;
 313         int jindex = 1;
 314         int error = 0;
 315
 316         if (undo) {
 317                 jindex = 0;
 318                 goto fail_recoverd;
 319         }
 320
 321         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 322         if (IS_ERR(sdp->sd_jindex)) {
 323                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 324                 return PTR_ERR(sdp->sd_jindex);
 325         }
 326         ip = GFS2_I(sdp->sd_jindex);
 327         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 328
 329         /* Load in the journal index special file */
 330
 331         error = gfs2_jindex_hold(sdp, &ji_gh);
 332         if (error) {
 333                 fs_err(sdp, "can't read journal index: %d\n", error);
 334                 goto fail;
 335         }
 336
 337         error = -EINVAL;
 338         if (!gfs2_jindex_size(sdp)) {
 339                 fs_err(sdp, "no journals!\n");
 340                 goto fail_jindex;
 341         }
 342
 343         if (sdp->sd_args.ar_spectator) {
 344                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 345                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 346         } else {
 347                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 348                         fs_err(sdp, "can't mount journal #%u\n",
 349                                sdp->sd_lockstruct.ls_jid);
 350                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 351                                gfs2_jindex_size(sdp),
 352                                gfs2_jindex_size(sdp) - 1);
 353                         goto fail_jindex;
 354                 }
 355                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 356
 357                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 358                                           &gfs2_journal_glops,
 359                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 360                                           &sdp->sd_journal_gh);
 361                 if (error) {
 362                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 363                         goto fail_jindex;
 364                 }
 365
 366                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 367                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 368                                            LM_FLAG_NOEXP | GL_EXACT,
 369                                            &sdp->sd_jinode_gh);
 370                 if (error) {
 371                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 372                                error);
 373                         goto fail_journal_gh;
 374                 }
 375
 376                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 377                 if (error) {
 378                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 379                                sdp->sd_jdesc->jd_jid, error);
 380                         goto fail_jinode_gh;
 381                 }
 382                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 383         }
 384
 385         if (sdp->sd_lockstruct.ls_first) {
 386                 unsigned int x;
 387                 for (x = 0; x < sdp->sd_journals; x++) {
 388                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 389                         if (error) {
 390                                 fs_err(sdp, "error recovering journal %u: %d\n",
 391                                        x, error);
 392                                 goto fail_jinode_gh;
 393                         }
 394                 }
 395
 396                 gfs2_lm_others_may_mount(sdp);
 397         } else if (!sdp->sd_args.ar_spectator) {
 398                 error = gfs2_recover_journal(sdp->sd_jdesc);
 399                 if (error) {
 400                         fs_err(sdp, "error recovering my journal: %d\n", error);
 401                         goto fail_jinode_gh;
 402                 }
 403         }
 404
 405         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 406         gfs2_glock_dq_uninit(&ji_gh);
 407         jindex = 0;
 408
 409         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 410         error = IS_ERR(p);
 411         if (error) {
 412                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 413                 goto fail_jinode_gh;
 414         }
 415         sdp->sd_recoverd_process = p;
 416
 417         return 0;
 418
 419 fail_recoverd:
 420         kthread_stop(sdp->sd_recoverd_process);
 421 fail_jinode_gh:
 422         if (!sdp->sd_args.ar_spectator)
 423                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 424 fail_journal_gh:
 425         if (!sdp->sd_args.ar_spectator)
 426                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 427 fail_jindex:
 428         gfs2_jindex_free(sdp);
 429         if (jindex)
 430                 gfs2_glock_dq_uninit(&ji_gh);
 431 fail:
 432         iput(sdp->sd_jindex);
 433         return error;
 434 }
 435
 436
 437 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 438 {
 439         int error = 0;
 440         struct gfs2_inode *ip;
 441         struct inode *inode;
 442
 443         if (undo)
 444                 goto fail_qinode;
 445
 446         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 447         if (IS_ERR(inode)) {
 448                 error = PTR_ERR(inode);
 449                 fs_err(sdp, "can't read in master directory: %d\n", error);
 450                 goto fail;
 451         }
 452         sdp->sd_master_dir = inode;
 453
 454         error = init_journal(sdp, undo);
 455         if (error)
 456                 goto fail_master;
 457
 458         /* Read in the master inode number inode */
 459         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 460         if (IS_ERR(sdp->sd_inum_inode)) {
 461                 error = PTR_ERR(sdp->sd_inum_inode);
 462                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 463                 goto fail_journal;
 464         }
 465
 466
 467         /* Read in the master statfs inode */
 468         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 469         if (IS_ERR(sdp->sd_statfs_inode)) {
 470                 error = PTR_ERR(sdp->sd_statfs_inode);
 471                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 472                 goto fail_inum;
 473         }
 474
 475         /* Read in the resource index inode */
 476         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 477         if (IS_ERR(sdp->sd_rindex)) {
 478                 error = PTR_ERR(sdp->sd_rindex);
 479                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 480                 goto fail_statfs;
 481         }
 482         ip = GFS2_I(sdp->sd_rindex);
 483         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 484         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 485
 486         /* Read in the quota inode */
 487         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 488         if (IS_ERR(sdp->sd_quota_inode)) {
 489                 error = PTR_ERR(sdp->sd_quota_inode);
 490                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 491                 goto fail_rindex;
 492         }
 493         return 0;
 494
 495 fail_qinode:
 496         iput(sdp->sd_quota_inode);
 497 fail_rindex:
 498         gfs2_clear_rgrpd(sdp);
 499         iput(sdp->sd_rindex);
 500 fail_statfs:
 501         iput(sdp->sd_statfs_inode);
 502 fail_inum:
 503         iput(sdp->sd_inum_inode);
 504 fail_journal:
 505         init_journal(sdp, UNDO);
 506 fail_master:
 507         iput(sdp->sd_master_dir);
 508 fail:
 509         return error;
 510 }
 511
 512 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 513 {
 514         struct inode *pn = NULL;
 515         char buf[30];
 516         int error = 0;
 517         struct gfs2_inode *ip;
 518
 519         if (sdp->sd_args.ar_spectator)
 520                 return 0;
 521
 522         if (undo)
 523                 goto fail_qc_gh;
 524
 525         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 526         if (IS_ERR(pn)) {
 527                 error = PTR_ERR(pn);
 528                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 529                 return error;
 530         }
 531
 532         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 533         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 534         if (IS_ERR(sdp->sd_ir_inode)) {
 535                 error = PTR_ERR(sdp->sd_ir_inode);
 536                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 537                 goto fail;
 538         }
 539
 540         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 541         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 542         if (IS_ERR(sdp->sd_sc_inode)) {
 543                 error = PTR_ERR(sdp->sd_sc_inode);
 544                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 545                 goto fail_ir_i;
 546         }
 547
 548         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 549         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 550         if (IS_ERR(sdp->sd_qc_inode)) {
 551                 error = PTR_ERR(sdp->sd_qc_inode);
 552                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 553                 goto fail_ut_i;
 554         }
 555
 556         iput(pn);
 557         pn = NULL;
 558
 559         ip = GFS2_I(sdp->sd_ir_inode);
 560         error = gfs2_glock_nq_init(ip->i_gl,
 561                                    LM_ST_EXCLUSIVE, 0,
 562                                    &sdp->sd_ir_gh);
 563         if (error) {
 564                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 565                 goto fail_qc_i;
 566         }
 567
 568         ip = GFS2_I(sdp->sd_sc_inode);
 569         error = gfs2_glock_nq_init(ip->i_gl,
 570                                    LM_ST_EXCLUSIVE, 0,
 571                                    &sdp->sd_sc_gh);
 572         if (error) {
 573                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 574                 goto fail_ir_gh;
 575         }
 576
 577         ip = GFS2_I(sdp->sd_qc_inode);
 578         error = gfs2_glock_nq_init(ip->i_gl,
 579                                    LM_ST_EXCLUSIVE, 0,
 580                                    &sdp->sd_qc_gh);
 581         if (error) {
 582                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 583                 goto fail_ut_gh;
 584         }
 585
 586         return 0;
 587
 588 fail_qc_gh:
 589         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 590 fail_ut_gh:
 591         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 592 fail_ir_gh:
 593         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 594 fail_qc_i:
 595         iput(sdp->sd_qc_inode);
 596 fail_ut_i:
 597         iput(sdp->sd_sc_inode);
 598 fail_ir_i:
 599         iput(sdp->sd_ir_inode);
 600 fail:
 601         if (pn)
 602                 iput(pn);
 603         return error;
 604 }
 605
 606 static int init_threads(struct gfs2_sbd *sdp, int undo)
 607 {
 608         struct task_struct *p;
 609         int error = 0;
 610
 611         if (undo)
 612                 goto fail_quotad;
 613
 614         sdp->sd_log_flush_time = jiffies;
 615         sdp->sd_jindex_refresh_time = jiffies;
 616
 617         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 618         error = IS_ERR(p);
 619         if (error) {
 620                 fs_err(sdp, "can't start logd thread: %d\n", error);
 621                 return error;
 622         }
 623         sdp->sd_logd_process = p;
 624
 625         sdp->sd_statfs_sync_time = jiffies;
 626         sdp->sd_quota_sync_time = jiffies;
 627
 628         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 629         error = IS_ERR(p);
 630         if (error) {
 631                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 632                 goto fail;
 633         }
 634         sdp->sd_quotad_process = p;
 635
 636         return 0;
 637
 638
 639 fail_quotad:
 640         kthread_stop(sdp->sd_quotad_process);
 641 fail:
 642         kthread_stop(sdp->sd_logd_process);
 643         return error;
 644 }
 645
 646 /**
 647  * fill_super - Read in superblock
 648  * @sb: The VFS superblock
 649  * @data: Mount options
 650  * @silent: Don't complain if it's not a GFS2 filesystem
 651  *
 652  * Returns: errno
 653  */
 654
 655 static int fill_super(struct super_block *sb, void *data, int silent)
 656 {
 657         struct gfs2_sbd *sdp;
 658         struct gfs2_holder mount_gh;
 659         int error;
 660
 661         sdp = init_sbd(sb);
 662         if (!sdp) {
 663                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 664                 return -ENOMEM;
 665         }
 666
 667         error = gfs2_mount_args(sdp, (char *)data, 0);
 668         if (error) {
 669                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 670                 goto fail;
 671         }
 672
 673         init_vfs(sb, SDF_NOATIME);
 674
 675         /* Set up the buffer cache and fill in some fake block size values
 676            to allow us to read-in the on-disk superblock. */
 677         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 678         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 679         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 680                                GFS2_BASIC_BLOCK_SHIFT;
 681         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 682
 683         error = init_names(sdp, silent);
 684         if (error)
 685                 goto fail;
 686
 687         gfs2_create_debugfs_file(sdp);
 688
 689         error = gfs2_sys_fs_add(sdp);
 690         if (error)
 691                 goto fail;
 692
 693         error = gfs2_lm_mount(sdp, silent);
 694         if (error)
 695                 goto fail_sys;
 696
 697         error = init_locking(sdp, &mount_gh, DO);
 698         if (error)
 699                 goto fail_lm;
 700
 701         error = init_sb(sdp, silent, DO);
 702         if (error)
 703                 goto fail_locking;
 704
 705         error = init_inodes(sdp, DO);
 706         if (error)
 707                 goto fail_sb;
 708
 709         error = init_per_node(sdp, DO);
 710         if (error)
 711                 goto fail_inodes;
 712
 713         error = gfs2_statfs_init(sdp);
 714         if (error) {
 715                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 716                 goto fail_per_node;
 717         }
 718
 719         error = init_threads(sdp, DO);
 720         if (error)
 721                 goto fail_per_node;
 722
 723         if (!(sb->s_flags & MS_RDONLY)) {
 724                 error = gfs2_make_fs_rw(sdp);
 725                 if (error) {
 726                         fs_err(sdp, "can't make FS RW: %d\n", error);
 727                         goto fail_threads;
 728                 }
 729         }
 730
 731         gfs2_glock_dq_uninit(&mount_gh);
 732
 733         return 0;
 734
 735 fail_threads:
 736         init_threads(sdp, UNDO);
 737 fail_per_node:
 738         init_per_node(sdp, UNDO);
 739 fail_inodes:
 740         init_inodes(sdp, UNDO);
 741 fail_sb:
 742         init_sb(sdp, 0, UNDO);
 743 fail_locking:
 744         init_locking(sdp, &mount_gh, UNDO);
 745 fail_lm:
 746         gfs2_gl_hash_clear(sdp, WAIT);
 747         gfs2_lm_unmount(sdp);
 748         while (invalidate_inodes(sb))
 749                 yield();
 750 fail_sys:
 751         gfs2_sys_fs_del(sdp);
 752 fail:
 753         gfs2_delete_debugfs_file(sdp);
 754         kfree(sdp);
 755         sb->s_fs_info = NULL;
 756         return error;
 757 }
 758
 759 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 760                 const char *dev_name, void *data, struct vfsmount *mnt)
 761 {
 762         struct super_block *sb;
 763         struct gfs2_sbd *sdp;
 764         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 765         if (error)
 766                 goto out;
 767         sb = mnt->mnt_sb;
 768         sdp = sb->s_fs_info;
 769         sdp->sd_gfs2mnt = mnt;
 770 out:
 771         return error;
 772 }
 773
 774 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 775                            void *data, int silent)
 776 {
 777         struct gfs2_sbd *sdp = sb->s_fs_info;
 778         struct inode *inode;
 779         int error = 0;
 780
 781         new->s_fs_info = sdp;
 782         sdp->sd_vfs_meta = sb;
 783
 784         init_vfs(new, SDF_NOATIME);
 785
 786         /* Get the master inode */
 787         inode = igrab(sdp->sd_master_dir);
 788
 789         new->s_root = d_alloc_root(inode);
 790         if (!new->s_root) {
 791                 fs_err(sdp, "can't get root dentry\n");
 792                 error = -ENOMEM;
 793                 iput(inode);
 794         } else
 795                 new->s_root->d_op = &gfs2_dops;
 796
 797         return error;
 798 }
 799
 800 static int set_bdev_super(struct super_block *s, void *data)
 801 {
 802         s->s_bdev = data;
 803         s->s_dev = s->s_bdev->bd_dev;
 804         return 0;
 805 }
 806
 807 static int test_bdev_super(struct super_block *s, void *data)
 808 {
 809         return s->s_bdev == data;
 810 }
 811
 812 static struct super_block* get_gfs2_sb(const char *dev_name)
 813 {
 814         struct kstat stat;
 815         struct nameidata nd;
 816         struct file_system_type *fstype;
 817         struct super_block *sb = NULL, *s;
 818         struct list_head *l;
 819         int error;
 820
 821         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 822         if (error) {
 823                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 824                        dev_name);
 825                 goto out;
 826         }
 827         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 828
 829         fstype = get_fs_type("gfs2");
 830         list_for_each(l, &fstype->fs_supers) {
 831                 s = list_entry(l, struct super_block, s_instances);
 832                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 833                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 834                         sb = s;
 835                         goto free_nd;
 836                 }
 837         }
 838
 839         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 840                "mount point %s\n", dev_name);
 841
 842 free_nd:
 843         path_release(&nd);
 844 out:
 845         return sb;
 846 }
 847
 848 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 849                             const char *dev_name, void *data, struct vfsmount *mnt)
 850 {
 851         int error = 0;
 852         struct super_block *sb = NULL, *new;
 853         struct gfs2_sbd *sdp;
 854
 855         sb = get_gfs2_sb(dev_name);
 856         if (!sb) {
 857                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 858                 error = -ENOENT;
 859                 goto error;
 860         }
 861         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 862         if (sdp->sd_vfs_meta) {
 863                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 864                 error = -EBUSY;
 865                 goto error;
 866         }
 867         down(&sb->s_bdev->bd_mount_sem);
 868         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 869         up(&sb->s_bdev->bd_mount_sem);
 870         if (IS_ERR(new)) {
 871                 error = PTR_ERR(new);
 872                 goto error;
 873         }
 874         module_put(fs_type->owner);
 875         new->s_flags = flags;
 876         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 877         sb_set_blocksize(new, sb->s_blocksize);
 878         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 879         if (error) {
 880                 up_write(&new->s_umount);
 881                 deactivate_super(new);
 882                 goto error;
 883         }
 884
 885         new->s_flags |= MS_ACTIVE;
 886
 887         /* Grab a reference to the gfs2 mount point */
 888         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 889         return simple_set_mnt(mnt, new);
 890 error:
 891         return error;
 892 }
 893
 894 static void gfs2_kill_sb(struct super_block *sb)
 895 {
 896         gfs2_delete_debugfs_file(sb->s_fs_info);
 897         kill_block_super(sb);
 898 }
 899
 900 static void gfs2_kill_sb_meta(struct super_block *sb)
 901 {
 902         struct gfs2_sbd *sdp = sb->s_fs_info;
 903         generic_shutdown_super(sb);
 904         sdp->sd_vfs_meta = NULL;
 905         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 906 }
 907
 908 struct file_system_type gfs2_fs_type = {
 909         .name = "gfs2",
 910         .fs_flags = FS_REQUIRES_DEV,
 911         .get_sb = gfs2_get_sb,
 912         .kill_sb = gfs2_kill_sb,
 913         .owner = THIS_MODULE,
 914 };
 915
 916 struct file_system_type gfs2meta_fs_type = {
 917         .name = "gfs2meta",
 918         .fs_flags = FS_REQUIRES_DEV,
 919         .get_sb = gfs2_get_sb_meta,
 920         .kill_sb = gfs2_kill_sb_meta,
 921         .owner = THIS_MODULE,
 922 };
 923