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 v.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/vmalloc.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/kthread.h>
  18 #include <linux/namei.h>
  19 #include <linux/mount.h>
  20 #include <linux/gfs2_ondisk.h>
  21
  22 #include "gfs2.h"
  23 #include "lm_interface.h"
  24 #include "incore.h"
  25 #include "daemon.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.h"
  29 #include "lm.h"
  30 #include "mount.h"
  31 #include "ops_export.h"
  32 #include "ops_fstype.h"
  33 #include "ops_super.h"
  34 #include "recovery.h"
  35 #include "rgrp.h"
  36 #include "super.h"
  37 #include "sys.h"
  38 #include "util.h"
  39
  40 #define DO 0
  41 #define UNDO 1
  42
  43 extern struct dentry_operations gfs2_dops;
  44
  45 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  46 {
  47         struct gfs2_sbd *sdp;
  48         unsigned int x;
  49
  50         sdp = vmalloc(sizeof(struct gfs2_sbd));
  51         if (!sdp)
  52                 return NULL;
  53
  54         memset(sdp, 0, sizeof(struct gfs2_sbd));
  55
  56         sb->s_fs_info = sdp;
  57         sdp->sd_vfs = sb;
  58
  59         gfs2_tune_init(&sdp->sd_tune);
  60
  61         for (x = 0; x < GFS2_GL_HASH_SIZE; x++) {
  62                 rwlock_init(&sdp->sd_gl_hash[x].hb_lock);
  63                 INIT_LIST_HEAD(&sdp->sd_gl_hash[x].hb_list);
  64         }
  65         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  66         spin_lock_init(&sdp->sd_reclaim_lock);
  67         init_waitqueue_head(&sdp->sd_reclaim_wq);
  68
  69         mutex_init(&sdp->sd_inum_mutex);
  70         spin_lock_init(&sdp->sd_statfs_spin);
  71         mutex_init(&sdp->sd_statfs_mutex);
  72
  73         spin_lock_init(&sdp->sd_rindex_spin);
  74         mutex_init(&sdp->sd_rindex_mutex);
  75         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  76         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  77         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  78
  79         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  80         spin_lock_init(&sdp->sd_jindex_spin);
  81         mutex_init(&sdp->sd_jindex_mutex);
  82
  83         INIT_LIST_HEAD(&sdp->sd_quota_list);
  84         spin_lock_init(&sdp->sd_quota_spin);
  85         mutex_init(&sdp->sd_quota_mutex);
  86
  87         spin_lock_init(&sdp->sd_log_lock);
  88
  89         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
  90         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  91         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  92         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  93         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  94
  95         mutex_init(&sdp->sd_log_reserve_mutex);
  96         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  97         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  98
  99         init_rwsem(&sdp->sd_log_flush_lock);
 100         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
 101
 102         INIT_LIST_HEAD(&sdp->sd_revoke_list);
 103
 104         mutex_init(&sdp->sd_freeze_lock);
 105
 106         return sdp;
 107 }
 108
 109 static void init_vfs(struct super_block *sb, unsigned noatime)
 110 {
 111         struct gfs2_sbd *sdp = sb->s_fs_info;
 112
 113         sb->s_magic = GFS2_MAGIC;
 114         sb->s_op = &gfs2_super_ops;
 115         sb->s_export_op = &gfs2_export_ops;
 116         sb->s_maxbytes = MAX_LFS_FILESIZE;
 117
 118         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 119                 set_bit(noatime, &sdp->sd_flags);
 120
 121         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 122         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 123 }
 124
 125 static int init_names(struct gfs2_sbd *sdp, int silent)
 126 {
 127         struct gfs2_sb *sb = NULL;
 128         char *proto, *table;
 129         int error = 0;
 130
 131         proto = sdp->sd_args.ar_lockproto;
 132         table = sdp->sd_args.ar_locktable;
 133
 134         /*  Try to autodetect  */
 135
 136         if (!proto[0] || !table[0]) {
 137                 struct buffer_head *bh;
 138                 bh = sb_getblk(sdp->sd_vfs,
 139                                GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 140                 lock_buffer(bh);
 141                 clear_buffer_uptodate(bh);
 142                 clear_buffer_dirty(bh);
 143                 unlock_buffer(bh);
 144                 ll_rw_block(READ, 1, &bh);
 145                 wait_on_buffer(bh);
 146
 147                 if (!buffer_uptodate(bh)) {
 148                         brelse(bh);
 149                         return -EIO;
 150                 }
 151
 152                 sb = kmalloc(sizeof(struct gfs2_sb), GFP_KERNEL);
 153                 if (!sb) {
 154                         brelse(bh);
 155                         return -ENOMEM;
 156                 }
 157                 gfs2_sb_in(sb, bh->b_data);
 158                 brelse(bh);
 159
 160                 error = gfs2_check_sb(sdp, sb, silent);
 161                 if (error)
 162                         goto out;
 163
 164                 if (!proto[0])
 165                         proto = sb->sb_lockproto;
 166                 if (!table[0])
 167                         table = sb->sb_locktable;
 168         }
 169
 170         if (!table[0])
 171                 table = sdp->sd_vfs->s_id;
 172
 173         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 174         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 175
 176  out:
 177         kfree(sb);
 178
 179         return error;
 180 }
 181
 182 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 183                         int undo)
 184 {
 185         struct task_struct *p;
 186         int error = 0;
 187
 188         if (undo)
 189                 goto fail_trans;
 190
 191         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 192         error = IS_ERR(p);
 193         if (error) {
 194                 fs_err(sdp, "can't start scand thread: %d\n", error);
 195                 return error;
 196         }
 197         sdp->sd_scand_process = p;
 198
 199         for (sdp->sd_glockd_num = 0;
 200              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 201              sdp->sd_glockd_num++) {
 202                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 203                 error = IS_ERR(p);
 204                 if (error) {
 205                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 206                         goto fail;
 207                 }
 208                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 209         }
 210
 211         error = gfs2_glock_nq_num(sdp,
 212                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 213                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 214                                   mount_gh);
 215         if (error) {
 216                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 217                 goto fail;
 218         }
 219
 220         error = gfs2_glock_nq_num(sdp,
 221                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 222                                   LM_ST_SHARED,
 223                                   LM_FLAG_NOEXP | GL_EXACT,
 224                                   &sdp->sd_live_gh);
 225         if (error) {
 226                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 227                 goto fail_mount;
 228         }
 229
 230         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 231                                CREATE, &sdp->sd_rename_gl);
 232         if (error) {
 233                 fs_err(sdp, "can't create rename glock: %d\n", error);
 234                 goto fail_live;
 235         }
 236
 237         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 238                                CREATE, &sdp->sd_trans_gl);
 239         if (error) {
 240                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 241                 goto fail_rename;
 242         }
 243         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 244
 245         return 0;
 246
 247 fail_trans:
 248         gfs2_glock_put(sdp->sd_trans_gl);
 249
 250 fail_rename:
 251         gfs2_glock_put(sdp->sd_rename_gl);
 252
 253 fail_live:
 254         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 255
 256 fail_mount:
 257         gfs2_glock_dq_uninit(mount_gh);
 258
 259 fail:
 260         while (sdp->sd_glockd_num--)
 261                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 262
 263         kthread_stop(sdp->sd_scand_process);
 264
 265         return error;
 266 }
 267
 268 static struct inode *gfs2_lookup_root(struct super_block *sb,
 269                                       struct gfs2_inum *inum)
 270 {
 271         return gfs2_inode_lookup(sb, inum, DT_DIR);
 272 }
 273
 274 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 275 {
 276         struct super_block *sb = sdp->sd_vfs;
 277         struct gfs2_holder sb_gh;
 278         struct gfs2_inum *inum;
 279         struct inode *inode;
 280         int error = 0;
 281
 282         if (undo) {
 283                 if (sb->s_root) {
 284                         dput(sb->s_root);
 285                         sb->s_root = NULL;
 286                 }
 287                 return 0;
 288         }
 289
 290         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 291                                  LM_ST_SHARED, 0, &sb_gh);
 292         if (error) {
 293                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 294                 return error;
 295         }
 296
 297         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 298         if (error) {
 299                 fs_err(sdp, "can't read superblock: %d\n", error);
 300                 goto out;
 301         }
 302
 303         /* Set up the buffer cache and SB for real */
 304         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 305                 error = -EINVAL;
 306                 fs_err(sdp, "FS block size (%u) is too small for device "
 307                        "block size (%u)\n",
 308                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 309                 goto out;
 310         }
 311         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 312                 error = -EINVAL;
 313                 fs_err(sdp, "FS block size (%u) is too big for machine "
 314                        "page size (%u)\n",
 315                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 316                 goto out;
 317         }
 318         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 319
 320         /* Get the root inode */
 321         inum = &sdp->sd_sb.sb_root_dir;
 322         if (sb->s_type == &gfs2meta_fs_type)
 323                 inum = &sdp->sd_sb.sb_master_dir;
 324         inode = gfs2_lookup_root(sb, inum);
 325         if (IS_ERR(inode)) {
 326                 error = PTR_ERR(inode);
 327                 fs_err(sdp, "can't read in root inode: %d\n", error);
 328                 goto out;
 329         }
 330
 331         sb->s_root = d_alloc_root(inode);
 332         if (!sb->s_root) {
 333                 fs_err(sdp, "can't get root dentry\n");
 334                 error = -ENOMEM;
 335                 iput(inode);
 336         }
 337         sb->s_root->d_op = &gfs2_dops;
 338 out:
 339         gfs2_glock_dq_uninit(&sb_gh);
 340         return error;
 341 }
 342
 343 static int init_journal(struct gfs2_sbd *sdp, int undo)
 344 {
 345         struct gfs2_holder ji_gh;
 346         struct task_struct *p;
 347         struct gfs2_inode *ip;
 348         int jindex = 1;
 349         int error = 0;
 350
 351         if (undo) {
 352                 jindex = 0;
 353                 goto fail_recoverd;
 354         }
 355
 356         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 357         if (IS_ERR(sdp->sd_jindex)) {
 358                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 359                 return PTR_ERR(sdp->sd_jindex);
 360         }
 361         ip = GFS2_I(sdp->sd_jindex);
 362         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 363
 364         /* Load in the journal index special file */
 365
 366         error = gfs2_jindex_hold(sdp, &ji_gh);
 367         if (error) {
 368                 fs_err(sdp, "can't read journal index: %d\n", error);
 369                 goto fail;
 370         }
 371
 372         error = -EINVAL;
 373         if (!gfs2_jindex_size(sdp)) {
 374                 fs_err(sdp, "no journals!\n");
 375                 goto fail_jindex;
 376         }
 377
 378         if (sdp->sd_args.ar_spectator) {
 379                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 380                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 381         } else {
 382                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 383                         fs_err(sdp, "can't mount journal #%u\n",
 384                                sdp->sd_lockstruct.ls_jid);
 385                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 386                                gfs2_jindex_size(sdp),
 387                                gfs2_jindex_size(sdp) - 1);
 388                         goto fail_jindex;
 389                 }
 390                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 391
 392                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 393                                           &gfs2_journal_glops,
 394                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 395                                           &sdp->sd_journal_gh);
 396                 if (error) {
 397                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 398                         goto fail_jindex;
 399                 }
 400
 401                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 402                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 403                                            LM_FLAG_NOEXP | GL_EXACT,
 404                                            &sdp->sd_jinode_gh);
 405                 if (error) {
 406                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 407                                error);
 408                         goto fail_journal_gh;
 409                 }
 410
 411                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 412                 if (error) {
 413                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 414                                sdp->sd_jdesc->jd_jid, error);
 415                         goto fail_jinode_gh;
 416                 }
 417                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 418         }
 419
 420         if (sdp->sd_lockstruct.ls_first) {
 421                 unsigned int x;
 422                 for (x = 0; x < sdp->sd_journals; x++) {
 423                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 424                         if (error) {
 425                                 fs_err(sdp, "error recovering journal %u: %d\n",
 426                                        x, error);
 427                                 goto fail_jinode_gh;
 428                         }
 429                 }
 430
 431                 gfs2_lm_others_may_mount(sdp);
 432         } else if (!sdp->sd_args.ar_spectator) {
 433                 error = gfs2_recover_journal(sdp->sd_jdesc);
 434                 if (error) {
 435                         fs_err(sdp, "error recovering my journal: %d\n", error);
 436                         goto fail_jinode_gh;
 437                 }
 438         }
 439
 440         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 441         gfs2_glock_dq_uninit(&ji_gh);
 442         jindex = 0;
 443
 444         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 445         error = IS_ERR(p);
 446         if (error) {
 447                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 448                 goto fail_jinode_gh;
 449         }
 450         sdp->sd_recoverd_process = p;
 451
 452         return 0;
 453
 454  fail_recoverd:
 455         kthread_stop(sdp->sd_recoverd_process);
 456
 457  fail_jinode_gh:
 458         if (!sdp->sd_args.ar_spectator)
 459                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 460
 461  fail_journal_gh:
 462         if (!sdp->sd_args.ar_spectator)
 463                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 464
 465  fail_jindex:
 466         gfs2_jindex_free(sdp);
 467         if (jindex)
 468                 gfs2_glock_dq_uninit(&ji_gh);
 469
 470  fail:
 471         iput(sdp->sd_jindex);
 472
 473         return error;
 474 }
 475
 476
 477 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 478 {
 479         int error = 0;
 480         struct gfs2_inode *ip;
 481         struct inode *inode;
 482
 483         if (undo)
 484                 goto fail_qinode;
 485
 486         inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
 487         if (IS_ERR(inode)) {
 488                 error = PTR_ERR(inode);
 489                 fs_err(sdp, "can't read in master directory: %d\n", error);
 490                 goto fail;
 491         }
 492         sdp->sd_master_dir = inode;
 493
 494         error = init_journal(sdp, undo);
 495         if (error)
 496                 goto fail_master;
 497
 498         /* Read in the master inode number inode */
 499         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 500         if (IS_ERR(sdp->sd_inum_inode)) {
 501                 error = PTR_ERR(sdp->sd_inum_inode);
 502                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 503                 goto fail_journal;
 504         }
 505
 506
 507         /* Read in the master statfs inode */
 508         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 509         if (IS_ERR(sdp->sd_statfs_inode)) {
 510                 error = PTR_ERR(sdp->sd_statfs_inode);
 511                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 512                 goto fail_inum;
 513         }
 514
 515         /* Read in the resource index inode */
 516         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 517         if (IS_ERR(sdp->sd_rindex)) {
 518                 error = PTR_ERR(sdp->sd_rindex);
 519                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 520                 goto fail_statfs;
 521         }
 522         ip = GFS2_I(sdp->sd_rindex);
 523         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 524         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 525
 526         /* Read in the quota inode */
 527         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 528         if (IS_ERR(sdp->sd_quota_inode)) {
 529                 error = PTR_ERR(sdp->sd_quota_inode);
 530                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 531                 goto fail_rindex;
 532         }
 533         return 0;
 534
 535 fail_qinode:
 536         iput(sdp->sd_quota_inode);
 537
 538 fail_rindex:
 539         gfs2_clear_rgrpd(sdp);
 540         iput(sdp->sd_rindex);
 541
 542 fail_statfs:
 543         iput(sdp->sd_statfs_inode);
 544
 545 fail_inum:
 546         iput(sdp->sd_inum_inode);
 547 fail_journal:
 548         init_journal(sdp, UNDO);
 549 fail_master:
 550         iput(sdp->sd_master_dir);
 551 fail:
 552         return error;
 553 }
 554
 555 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 556 {
 557         struct inode *pn = NULL;
 558         char buf[30];
 559         int error = 0;
 560         struct gfs2_inode *ip;
 561
 562         if (sdp->sd_args.ar_spectator)
 563                 return 0;
 564
 565         if (undo)
 566                 goto fail_qc_gh;
 567
 568         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 569         if (IS_ERR(pn)) {
 570                 error = PTR_ERR(pn);
 571                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 572                 return error;
 573         }
 574
 575         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 576         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 577         if (IS_ERR(sdp->sd_ir_inode)) {
 578                 error = PTR_ERR(sdp->sd_ir_inode);
 579                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 580                 goto fail;
 581         }
 582
 583         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 584         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 585         if (IS_ERR(sdp->sd_sc_inode)) {
 586                 error = PTR_ERR(sdp->sd_sc_inode);
 587                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 588                 goto fail_ir_i;
 589         }
 590
 591         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 592         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 593         if (IS_ERR(sdp->sd_qc_inode)) {
 594                 error = PTR_ERR(sdp->sd_qc_inode);
 595                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 596                 goto fail_ut_i;
 597         }
 598
 599         iput(pn);
 600         pn = NULL;
 601
 602         ip = GFS2_I(sdp->sd_ir_inode);
 603         error = gfs2_glock_nq_init(ip->i_gl,
 604                                    LM_ST_EXCLUSIVE, 0,
 605                                    &sdp->sd_ir_gh);
 606         if (error) {
 607                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 608                 goto fail_qc_i;
 609         }
 610
 611         ip = GFS2_I(sdp->sd_sc_inode);
 612         error = gfs2_glock_nq_init(ip->i_gl,
 613                                    LM_ST_EXCLUSIVE, 0,
 614                                    &sdp->sd_sc_gh);
 615         if (error) {
 616                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 617                 goto fail_ir_gh;
 618         }
 619
 620         ip = GFS2_I(sdp->sd_qc_inode);
 621         error = gfs2_glock_nq_init(ip->i_gl,
 622                                    LM_ST_EXCLUSIVE, 0,
 623                                    &sdp->sd_qc_gh);
 624         if (error) {
 625                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 626                 goto fail_ut_gh;
 627         }
 628
 629         return 0;
 630
 631  fail_qc_gh:
 632         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 633
 634  fail_ut_gh:
 635
 636         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 637
 638  fail_ir_gh:
 639         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 640
 641  fail_qc_i:
 642         iput(sdp->sd_qc_inode);
 643
 644  fail_ut_i:
 645
 646         iput(sdp->sd_sc_inode);
 647
 648  fail_ir_i:
 649         iput(sdp->sd_ir_inode);
 650
 651  fail:
 652         if (pn)
 653                 iput(pn);
 654         return error;
 655 }
 656
 657 static int init_threads(struct gfs2_sbd *sdp, int undo)
 658 {
 659         struct task_struct *p;
 660         int error = 0;
 661
 662         if (undo)
 663                 goto fail_quotad;
 664
 665         sdp->sd_log_flush_time = jiffies;
 666         sdp->sd_jindex_refresh_time = jiffies;
 667
 668         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 669         error = IS_ERR(p);
 670         if (error) {
 671                 fs_err(sdp, "can't start logd thread: %d\n", error);
 672                 return error;
 673         }
 674         sdp->sd_logd_process = p;
 675
 676         sdp->sd_statfs_sync_time = jiffies;
 677         sdp->sd_quota_sync_time = jiffies;
 678
 679         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 680         error = IS_ERR(p);
 681         if (error) {
 682                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 683                 goto fail;
 684         }
 685         sdp->sd_quotad_process = p;
 686
 687         return 0;
 688
 689
 690 fail_quotad:
 691         kthread_stop(sdp->sd_quotad_process);
 692 fail:
 693         kthread_stop(sdp->sd_logd_process);
 694         return error;
 695 }
 696
 697 /**
 698  * fill_super - Read in superblock
 699  * @sb: The VFS superblock
 700  * @data: Mount options
 701  * @silent: Don't complain if it's not a GFS2 filesystem
 702  *
 703  * Returns: errno
 704  */
 705
 706 static int fill_super(struct super_block *sb, void *data, int silent)
 707 {
 708         struct gfs2_sbd *sdp;
 709         struct gfs2_holder mount_gh;
 710         int error;
 711
 712         sdp = init_sbd(sb);
 713         if (!sdp) {
 714                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 715                 return -ENOMEM;
 716         }
 717
 718         error = gfs2_mount_args(sdp, (char *)data, 0);
 719         if (error) {
 720                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 721                 goto fail;
 722         }
 723
 724         init_vfs(sb, SDF_NOATIME);
 725
 726         /* Set up the buffer cache and fill in some fake block size values
 727            to allow us to read-in the on-disk superblock. */
 728         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 729         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 730         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 731                                GFS2_BASIC_BLOCK_SHIFT;
 732         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 733
 734         error = init_names(sdp, silent);
 735         if (error)
 736                 goto fail;
 737
 738         error = gfs2_sys_fs_add(sdp);
 739         if (error)
 740                 goto fail;
 741
 742         error = gfs2_lm_mount(sdp, silent);
 743         if (error)
 744                 goto fail_sys;
 745
 746         error = init_locking(sdp, &mount_gh, DO);
 747         if (error)
 748                 goto fail_lm;
 749
 750         error = init_sb(sdp, silent, DO);
 751         if (error)
 752                 goto fail_locking;
 753
 754         error = init_inodes(sdp, DO);
 755         if (error)
 756                 goto fail_sb;
 757
 758         error = init_per_node(sdp, DO);
 759         if (error)
 760                 goto fail_inodes;
 761
 762         error = gfs2_statfs_init(sdp);
 763         if (error) {
 764                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 765                 goto fail_per_node;
 766         }
 767
 768         error = init_threads(sdp, DO);
 769         if (error)
 770                 goto fail_per_node;
 771
 772         if (!(sb->s_flags & MS_RDONLY)) {
 773                 error = gfs2_make_fs_rw(sdp);
 774                 if (error) {
 775                         fs_err(sdp, "can't make FS RW: %d\n", error);
 776                         goto fail_threads;
 777                 }
 778         }
 779
 780         gfs2_glock_dq_uninit(&mount_gh);
 781
 782         return 0;
 783
 784  fail_threads:
 785         init_threads(sdp, UNDO);
 786
 787  fail_per_node:
 788         init_per_node(sdp, UNDO);
 789
 790  fail_inodes:
 791         init_inodes(sdp, UNDO);
 792
 793  fail_sb:
 794         init_sb(sdp, 0, UNDO);
 795
 796  fail_locking:
 797         init_locking(sdp, &mount_gh, UNDO);
 798
 799  fail_lm:
 800         gfs2_gl_hash_clear(sdp, WAIT);
 801         gfs2_lm_unmount(sdp);
 802         while (invalidate_inodes(sb))
 803                 yield();
 804
 805  fail_sys:
 806         gfs2_sys_fs_del(sdp);
 807
 808  fail:
 809         vfree(sdp);
 810         sb->s_fs_info = NULL;
 811
 812         return error;
 813 }
 814
 815 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 816                 const char *dev_name, void *data, struct vfsmount *mnt)
 817 {
 818         struct super_block *sb;
 819         struct gfs2_sbd *sdp;
 820         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 821         if (error)
 822                 goto out;
 823         sb = mnt->mnt_sb;
 824         sdp = (struct gfs2_sbd*)sb->s_fs_info;
 825         sdp->sd_gfs2mnt = mnt;
 826 out:
 827         return error;
 828 }
 829
 830 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 831                            void *data, int silent)
 832 {
 833         struct gfs2_sbd *sdp = sb->s_fs_info;
 834         struct inode *inode;
 835         int error = 0;
 836
 837         new->s_fs_info = sdp;
 838         sdp->sd_vfs_meta = sb;
 839
 840         init_vfs(new, SDF_NOATIME);
 841
 842         /* Get the master inode */
 843         inode = igrab(sdp->sd_master_dir);
 844
 845         new->s_root = d_alloc_root(inode);
 846         if (!new->s_root) {
 847                 fs_err(sdp, "can't get root dentry\n");
 848                 error = -ENOMEM;
 849                 iput(inode);
 850         }
 851         new->s_root->d_op = &gfs2_dops;
 852
 853         return error;
 854 }
 855 static int set_bdev_super(struct super_block *s, void *data)
 856 {
 857         s->s_bdev = data;
 858         s->s_dev = s->s_bdev->bd_dev;
 859         return 0;
 860 }
 861
 862 static int test_bdev_super(struct super_block *s, void *data)
 863 {
 864         return (void *)s->s_bdev == data;
 865 }
 866
 867 static struct super_block* get_gfs2_sb(const char *dev_name)
 868 {
 869         struct kstat stat;
 870         struct nameidata nd;
 871         struct file_system_type *fstype;
 872         struct super_block *sb = NULL, *s;
 873         struct list_head *l;
 874         int error;
 875
 876         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 877         if (error) {
 878                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 879                        dev_name);
 880                 goto out;
 881         }
 882         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 883
 884         fstype = get_fs_type("gfs2");
 885         list_for_each(l, &fstype->fs_supers) {
 886                 s = list_entry(l, struct super_block, s_instances);
 887                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 888                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 889                         sb = s;
 890                         goto free_nd;
 891                 }
 892         }
 893
 894         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 895                "mount point %s", dev_name);
 896
 897 free_nd:
 898         path_release(&nd);
 899 out:
 900         return sb;
 901 }
 902
 903 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 904                             const char *dev_name, void *data, struct vfsmount *mnt)
 905 {
 906         int error = 0;
 907         struct super_block *sb = NULL, *new;
 908         struct gfs2_sbd *sdp;
 909         char *gfs2mnt = NULL;
 910
 911         sb = get_gfs2_sb(dev_name);
 912         if (!sb) {
 913                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 914                 error = -ENOENT;
 915                 goto error;
 916         }
 917         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 918         if (sdp->sd_vfs_meta) {
 919                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 920                 error = -EBUSY;
 921                 goto error;
 922         }
 923         mutex_lock(&sb->s_bdev->bd_mount_mutex);
 924         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 925         mutex_unlock(&sb->s_bdev->bd_mount_mutex);
 926         if (IS_ERR(new)) {
 927                 error = PTR_ERR(new);
 928                 goto error;
 929         }
 930         module_put(fs_type->owner);
 931         new->s_flags = flags;
 932         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 933         sb_set_blocksize(new, sb->s_blocksize);
 934         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 935         if (error) {
 936                 up_write(&new->s_umount);
 937                 deactivate_super(new);
 938                 goto error;
 939         }
 940
 941         new->s_flags |= MS_ACTIVE;
 942
 943         /* Grab a reference to the gfs2 mount point */
 944         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 945         return simple_set_mnt(mnt, new);
 946 error:
 947         if (gfs2mnt)
 948                 kfree(gfs2mnt);
 949         return error;
 950 }
 951
 952 static void gfs2_kill_sb(struct super_block *sb)
 953 {
 954         kill_block_super(sb);
 955 }
 956
 957 static void gfs2_kill_sb_meta(struct super_block *sb)
 958 {
 959         struct gfs2_sbd *sdp = sb->s_fs_info;
 960         generic_shutdown_super(sb);
 961         sdp->sd_vfs_meta = NULL;
 962         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 963 }
 964
 965 struct file_system_type gfs2_fs_type = {
 966         .name = "gfs2",
 967         .fs_flags = FS_REQUIRES_DEV,
 968         .get_sb = gfs2_get_sb,
 969         .kill_sb = gfs2_kill_sb,
 970         .owner = THIS_MODULE,
 971 };
 972
 973 struct file_system_type gfs2meta_fs_type = {
 974         .name = "gfs2meta",
 975         .fs_flags = FS_REQUIRES_DEV,
 976         .get_sb = gfs2_get_sb_meta,
 977         .kill_sb = gfs2_kill_sb_meta,
 978         .owner = THIS_MODULE,
 979 };
 980