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