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         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         return error;
 179 }
 180
 181 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 182                         int undo)
 183 {
 184         struct task_struct *p;
 185         int error = 0;
 186
 187         if (undo)
 188                 goto fail_trans;
 189
 190         p = kthread_run(gfs2_scand, sdp, "gfs2_scand");
 191         error = IS_ERR(p);
 192         if (error) {
 193                 fs_err(sdp, "can't start scand thread: %d\n", error);
 194                 return error;
 195         }
 196         sdp->sd_scand_process = p;
 197
 198         for (sdp->sd_glockd_num = 0;
 199              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 200              sdp->sd_glockd_num++) {
 201                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 202                 error = IS_ERR(p);
 203                 if (error) {
 204                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 205                         goto fail;
 206                 }
 207                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 208         }
 209
 210         error = gfs2_glock_nq_num(sdp,
 211                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 212                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 213                                   mount_gh);
 214         if (error) {
 215                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 216                 goto fail;
 217         }
 218
 219         error = gfs2_glock_nq_num(sdp,
 220                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 221                                   LM_ST_SHARED,
 222                                   LM_FLAG_NOEXP | GL_EXACT,
 223                                   &sdp->sd_live_gh);
 224         if (error) {
 225                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 226                 goto fail_mount;
 227         }
 228
 229         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 230                                CREATE, &sdp->sd_rename_gl);
 231         if (error) {
 232                 fs_err(sdp, "can't create rename glock: %d\n", error);
 233                 goto fail_live;
 234         }
 235
 236         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 237                                CREATE, &sdp->sd_trans_gl);
 238         if (error) {
 239                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 240                 goto fail_rename;
 241         }
 242         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 243
 244         return 0;
 245
 246 fail_trans:
 247         gfs2_glock_put(sdp->sd_trans_gl);
 248 fail_rename:
 249         gfs2_glock_put(sdp->sd_rename_gl);
 250 fail_live:
 251         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 252 fail_mount:
 253         gfs2_glock_dq_uninit(mount_gh);
 254 fail:
 255         while (sdp->sd_glockd_num--)
 256                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 257
 258         kthread_stop(sdp->sd_scand_process);
 259         return error;
 260 }
 261
 262 static struct inode *gfs2_lookup_root(struct super_block *sb,
 263                                       struct gfs2_inum *inum)
 264 {
 265         return gfs2_inode_lookup(sb, inum, DT_DIR);
 266 }
 267
 268 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 269 {
 270         struct super_block *sb = sdp->sd_vfs;
 271         struct gfs2_holder sb_gh;
 272         struct gfs2_inum *inum;
 273         struct inode *inode;
 274         int error = 0;
 275
 276         if (undo) {
 277                 if (sb->s_root) {
 278                         dput(sb->s_root);
 279                         sb->s_root = NULL;
 280                 }
 281                 return 0;
 282         }
 283
 284         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 285                                  LM_ST_SHARED, 0, &sb_gh);
 286         if (error) {
 287                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 288                 return error;
 289         }
 290
 291         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 292         if (error) {
 293                 fs_err(sdp, "can't read superblock: %d\n", error);
 294                 goto out;
 295         }
 296
 297         /* Set up the buffer cache and SB for real */
 298         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 299                 error = -EINVAL;
 300                 fs_err(sdp, "FS block size (%u) is too small for device "
 301                        "block size (%u)\n",
 302                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 303                 goto out;
 304         }
 305         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 306                 error = -EINVAL;
 307                 fs_err(sdp, "FS block size (%u) is too big for machine "
 308                        "page size (%u)\n",
 309                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 310                 goto out;
 311         }
 312         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 313
 314         /* Get the root inode */
 315         inum = &sdp->sd_sb.sb_root_dir;
 316         if (sb->s_type == &gfs2meta_fs_type)
 317                 inum = &sdp->sd_sb.sb_master_dir;
 318         inode = gfs2_lookup_root(sb, inum);
 319         if (IS_ERR(inode)) {
 320                 error = PTR_ERR(inode);
 321                 fs_err(sdp, "can't read in root inode: %d\n", error);
 322                 goto out;
 323         }
 324
 325         sb->s_root = d_alloc_root(inode);
 326         if (!sb->s_root) {
 327                 fs_err(sdp, "can't get root dentry\n");
 328                 error = -ENOMEM;
 329                 iput(inode);
 330         }
 331         sb->s_root->d_op = &gfs2_dops;
 332 out:
 333         gfs2_glock_dq_uninit(&sb_gh);
 334         return error;
 335 }
 336
 337 static int init_journal(struct gfs2_sbd *sdp, int undo)
 338 {
 339         struct gfs2_holder ji_gh;
 340         struct task_struct *p;
 341         struct gfs2_inode *ip;
 342         int jindex = 1;
 343         int error = 0;
 344
 345         if (undo) {
 346                 jindex = 0;
 347                 goto fail_recoverd;
 348         }
 349
 350         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 351         if (IS_ERR(sdp->sd_jindex)) {
 352                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 353                 return PTR_ERR(sdp->sd_jindex);
 354         }
 355         ip = GFS2_I(sdp->sd_jindex);
 356         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 357
 358         /* Load in the journal index special file */
 359
 360         error = gfs2_jindex_hold(sdp, &ji_gh);
 361         if (error) {
 362                 fs_err(sdp, "can't read journal index: %d\n", error);
 363                 goto fail;
 364         }
 365
 366         error = -EINVAL;
 367         if (!gfs2_jindex_size(sdp)) {
 368                 fs_err(sdp, "no journals!\n");
 369                 goto fail_jindex;
 370         }
 371
 372         if (sdp->sd_args.ar_spectator) {
 373                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 374                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 375         } else {
 376                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 377                         fs_err(sdp, "can't mount journal #%u\n",
 378                                sdp->sd_lockstruct.ls_jid);
 379                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 380                                gfs2_jindex_size(sdp),
 381                                gfs2_jindex_size(sdp) - 1);
 382                         goto fail_jindex;
 383                 }
 384                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 385
 386                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 387                                           &gfs2_journal_glops,
 388                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 389                                           &sdp->sd_journal_gh);
 390                 if (error) {
 391                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 392                         goto fail_jindex;
 393                 }
 394
 395                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 396                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 397                                            LM_FLAG_NOEXP | GL_EXACT,
 398                                            &sdp->sd_jinode_gh);
 399                 if (error) {
 400                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 401                                error);
 402                         goto fail_journal_gh;
 403                 }
 404
 405                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 406                 if (error) {
 407                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 408                                sdp->sd_jdesc->jd_jid, error);
 409                         goto fail_jinode_gh;
 410                 }
 411                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 412         }
 413
 414         if (sdp->sd_lockstruct.ls_first) {
 415                 unsigned int x;
 416                 for (x = 0; x < sdp->sd_journals; x++) {
 417                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 418                         if (error) {
 419                                 fs_err(sdp, "error recovering journal %u: %d\n",
 420                                        x, error);
 421                                 goto fail_jinode_gh;
 422                         }
 423                 }
 424
 425                 gfs2_lm_others_may_mount(sdp);
 426         } else if (!sdp->sd_args.ar_spectator) {
 427                 error = gfs2_recover_journal(sdp->sd_jdesc);
 428                 if (error) {
 429                         fs_err(sdp, "error recovering my journal: %d\n", error);
 430                         goto fail_jinode_gh;
 431                 }
 432         }
 433
 434         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 435         gfs2_glock_dq_uninit(&ji_gh);
 436         jindex = 0;
 437
 438         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 439         error = IS_ERR(p);
 440         if (error) {
 441                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 442                 goto fail_jinode_gh;
 443         }
 444         sdp->sd_recoverd_process = p;
 445
 446         return 0;
 447
 448 fail_recoverd:
 449         kthread_stop(sdp->sd_recoverd_process);
 450 fail_jinode_gh:
 451         if (!sdp->sd_args.ar_spectator)
 452                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 453 fail_journal_gh:
 454         if (!sdp->sd_args.ar_spectator)
 455                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 456 fail_jindex:
 457         gfs2_jindex_free(sdp);
 458         if (jindex)
 459                 gfs2_glock_dq_uninit(&ji_gh);
 460 fail:
 461         iput(sdp->sd_jindex);
 462         return error;
 463 }
 464
 465
 466 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 467 {
 468         int error = 0;
 469         struct gfs2_inode *ip;
 470         struct inode *inode;
 471
 472         if (undo)
 473                 goto fail_qinode;
 474
 475         inode = gfs2_lookup_root(sdp->sd_vfs, &sdp->sd_sb.sb_master_dir);
 476         if (IS_ERR(inode)) {
 477                 error = PTR_ERR(inode);
 478                 fs_err(sdp, "can't read in master directory: %d\n", error);
 479                 goto fail;
 480         }
 481         sdp->sd_master_dir = inode;
 482
 483         error = init_journal(sdp, undo);
 484         if (error)
 485                 goto fail_master;
 486
 487         /* Read in the master inode number inode */
 488         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 489         if (IS_ERR(sdp->sd_inum_inode)) {
 490                 error = PTR_ERR(sdp->sd_inum_inode);
 491                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 492                 goto fail_journal;
 493         }
 494
 495
 496         /* Read in the master statfs inode */
 497         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 498         if (IS_ERR(sdp->sd_statfs_inode)) {
 499                 error = PTR_ERR(sdp->sd_statfs_inode);
 500                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 501                 goto fail_inum;
 502         }
 503
 504         /* Read in the resource index inode */
 505         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 506         if (IS_ERR(sdp->sd_rindex)) {
 507                 error = PTR_ERR(sdp->sd_rindex);
 508                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 509                 goto fail_statfs;
 510         }
 511         ip = GFS2_I(sdp->sd_rindex);
 512         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 513         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 514
 515         /* Read in the quota inode */
 516         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 517         if (IS_ERR(sdp->sd_quota_inode)) {
 518                 error = PTR_ERR(sdp->sd_quota_inode);
 519                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 520                 goto fail_rindex;
 521         }
 522         return 0;
 523
 524 fail_qinode:
 525         iput(sdp->sd_quota_inode);
 526 fail_rindex:
 527         gfs2_clear_rgrpd(sdp);
 528         iput(sdp->sd_rindex);
 529 fail_statfs:
 530         iput(sdp->sd_statfs_inode);
 531 fail_inum:
 532         iput(sdp->sd_inum_inode);
 533 fail_journal:
 534         init_journal(sdp, UNDO);
 535 fail_master:
 536         iput(sdp->sd_master_dir);
 537 fail:
 538         return error;
 539 }
 540
 541 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 542 {
 543         struct inode *pn = NULL;
 544         char buf[30];
 545         int error = 0;
 546         struct gfs2_inode *ip;
 547
 548         if (sdp->sd_args.ar_spectator)
 549                 return 0;
 550
 551         if (undo)
 552                 goto fail_qc_gh;
 553
 554         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 555         if (IS_ERR(pn)) {
 556                 error = PTR_ERR(pn);
 557                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 558                 return error;
 559         }
 560
 561         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 562         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 563         if (IS_ERR(sdp->sd_ir_inode)) {
 564                 error = PTR_ERR(sdp->sd_ir_inode);
 565                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 566                 goto fail;
 567         }
 568
 569         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 570         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 571         if (IS_ERR(sdp->sd_sc_inode)) {
 572                 error = PTR_ERR(sdp->sd_sc_inode);
 573                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 574                 goto fail_ir_i;
 575         }
 576
 577         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 578         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 579         if (IS_ERR(sdp->sd_qc_inode)) {
 580                 error = PTR_ERR(sdp->sd_qc_inode);
 581                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 582                 goto fail_ut_i;
 583         }
 584
 585         iput(pn);
 586         pn = NULL;
 587
 588         ip = GFS2_I(sdp->sd_ir_inode);
 589         error = gfs2_glock_nq_init(ip->i_gl,
 590                                    LM_ST_EXCLUSIVE, 0,
 591                                    &sdp->sd_ir_gh);
 592         if (error) {
 593                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 594                 goto fail_qc_i;
 595         }
 596
 597         ip = GFS2_I(sdp->sd_sc_inode);
 598         error = gfs2_glock_nq_init(ip->i_gl,
 599                                    LM_ST_EXCLUSIVE, 0,
 600                                    &sdp->sd_sc_gh);
 601         if (error) {
 602                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 603                 goto fail_ir_gh;
 604         }
 605
 606         ip = GFS2_I(sdp->sd_qc_inode);
 607         error = gfs2_glock_nq_init(ip->i_gl,
 608                                    LM_ST_EXCLUSIVE, 0,
 609                                    &sdp->sd_qc_gh);
 610         if (error) {
 611                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 612                 goto fail_ut_gh;
 613         }
 614
 615         return 0;
 616
 617 fail_qc_gh:
 618         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 619 fail_ut_gh:
 620         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 621 fail_ir_gh:
 622         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 623 fail_qc_i:
 624         iput(sdp->sd_qc_inode);
 625 fail_ut_i:
 626         iput(sdp->sd_sc_inode);
 627 fail_ir_i:
 628         iput(sdp->sd_ir_inode);
 629 fail:
 630         if (pn)
 631                 iput(pn);
 632         return error;
 633 }
 634
 635 static int init_threads(struct gfs2_sbd *sdp, int undo)
 636 {
 637         struct task_struct *p;
 638         int error = 0;
 639
 640         if (undo)
 641                 goto fail_quotad;
 642
 643         sdp->sd_log_flush_time = jiffies;
 644         sdp->sd_jindex_refresh_time = jiffies;
 645
 646         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 647         error = IS_ERR(p);
 648         if (error) {
 649                 fs_err(sdp, "can't start logd thread: %d\n", error);
 650                 return error;
 651         }
 652         sdp->sd_logd_process = p;
 653
 654         sdp->sd_statfs_sync_time = jiffies;
 655         sdp->sd_quota_sync_time = jiffies;
 656
 657         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 658         error = IS_ERR(p);
 659         if (error) {
 660                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 661                 goto fail;
 662         }
 663         sdp->sd_quotad_process = p;
 664
 665         return 0;
 666
 667
 668 fail_quotad:
 669         kthread_stop(sdp->sd_quotad_process);
 670 fail:
 671         kthread_stop(sdp->sd_logd_process);
 672         return error;
 673 }
 674
 675 /**
 676  * fill_super - Read in superblock
 677  * @sb: The VFS superblock
 678  * @data: Mount options
 679  * @silent: Don't complain if it's not a GFS2 filesystem
 680  *
 681  * Returns: errno
 682  */
 683
 684 static int fill_super(struct super_block *sb, void *data, int silent)
 685 {
 686         struct gfs2_sbd *sdp;
 687         struct gfs2_holder mount_gh;
 688         int error;
 689
 690         sdp = init_sbd(sb);
 691         if (!sdp) {
 692                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 693                 return -ENOMEM;
 694         }
 695
 696         error = gfs2_mount_args(sdp, (char *)data, 0);
 697         if (error) {
 698                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 699                 goto fail;
 700         }
 701
 702         init_vfs(sb, SDF_NOATIME);
 703
 704         /* Set up the buffer cache and fill in some fake block size values
 705            to allow us to read-in the on-disk superblock. */
 706         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 707         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 708         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 709                                GFS2_BASIC_BLOCK_SHIFT;
 710         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 711
 712         error = init_names(sdp, silent);
 713         if (error)
 714                 goto fail;
 715
 716         error = gfs2_sys_fs_add(sdp);
 717         if (error)
 718                 goto fail;
 719
 720         error = gfs2_lm_mount(sdp, silent);
 721         if (error)
 722                 goto fail_sys;
 723
 724         error = init_locking(sdp, &mount_gh, DO);
 725         if (error)
 726                 goto fail_lm;
 727
 728         error = init_sb(sdp, silent, DO);
 729         if (error)
 730                 goto fail_locking;
 731
 732         error = init_inodes(sdp, DO);
 733         if (error)
 734                 goto fail_sb;
 735
 736         error = init_per_node(sdp, DO);
 737         if (error)
 738                 goto fail_inodes;
 739
 740         error = gfs2_statfs_init(sdp);
 741         if (error) {
 742                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 743                 goto fail_per_node;
 744         }
 745
 746         error = init_threads(sdp, DO);
 747         if (error)
 748                 goto fail_per_node;
 749
 750         if (!(sb->s_flags & MS_RDONLY)) {
 751                 error = gfs2_make_fs_rw(sdp);
 752                 if (error) {
 753                         fs_err(sdp, "can't make FS RW: %d\n", error);
 754                         goto fail_threads;
 755                 }
 756         }
 757
 758         gfs2_glock_dq_uninit(&mount_gh);
 759
 760         return 0;
 761
 762 fail_threads:
 763         init_threads(sdp, UNDO);
 764 fail_per_node:
 765         init_per_node(sdp, UNDO);
 766 fail_inodes:
 767         init_inodes(sdp, UNDO);
 768 fail_sb:
 769         init_sb(sdp, 0, UNDO);
 770 fail_locking:
 771         init_locking(sdp, &mount_gh, UNDO);
 772 fail_lm:
 773         gfs2_gl_hash_clear(sdp, WAIT);
 774         gfs2_lm_unmount(sdp);
 775         while (invalidate_inodes(sb))
 776                 yield();
 777 fail_sys:
 778         gfs2_sys_fs_del(sdp);
 779 fail:
 780         vfree(sdp);
 781         sb->s_fs_info = NULL;
 782         return error;
 783 }
 784
 785 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 786                 const char *dev_name, void *data, struct vfsmount *mnt)
 787 {
 788         struct super_block *sb;
 789         struct gfs2_sbd *sdp;
 790         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 791         if (error)
 792                 goto out;
 793         sb = mnt->mnt_sb;
 794         sdp = (struct gfs2_sbd*)sb->s_fs_info;
 795         sdp->sd_gfs2mnt = mnt;
 796 out:
 797         return error;
 798 }
 799
 800 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 801                            void *data, int silent)
 802 {
 803         struct gfs2_sbd *sdp = sb->s_fs_info;
 804         struct inode *inode;
 805         int error = 0;
 806
 807         new->s_fs_info = sdp;
 808         sdp->sd_vfs_meta = sb;
 809
 810         init_vfs(new, SDF_NOATIME);
 811
 812         /* Get the master inode */
 813         inode = igrab(sdp->sd_master_dir);
 814
 815         new->s_root = d_alloc_root(inode);
 816         if (!new->s_root) {
 817                 fs_err(sdp, "can't get root dentry\n");
 818                 error = -ENOMEM;
 819                 iput(inode);
 820         }
 821         new->s_root->d_op = &gfs2_dops;
 822
 823         return error;
 824 }
 825
 826 static int set_bdev_super(struct super_block *s, void *data)
 827 {
 828         s->s_bdev = data;
 829         s->s_dev = s->s_bdev->bd_dev;
 830         return 0;
 831 }
 832
 833 static int test_bdev_super(struct super_block *s, void *data)
 834 {
 835         return (void *)s->s_bdev == data;
 836 }
 837
 838 static struct super_block* get_gfs2_sb(const char *dev_name)
 839 {
 840         struct kstat stat;
 841         struct nameidata nd;
 842         struct file_system_type *fstype;
 843         struct super_block *sb = NULL, *s;
 844         struct list_head *l;
 845         int error;
 846
 847         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 848         if (error) {
 849                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 850                        dev_name);
 851                 goto out;
 852         }
 853         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 854
 855         fstype = get_fs_type("gfs2");
 856         list_for_each(l, &fstype->fs_supers) {
 857                 s = list_entry(l, struct super_block, s_instances);
 858                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 859                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 860                         sb = s;
 861                         goto free_nd;
 862                 }
 863         }
 864
 865         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 866                "mount point %s", dev_name);
 867
 868 free_nd:
 869         path_release(&nd);
 870 out:
 871         return sb;
 872 }
 873
 874 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 875                             const char *dev_name, void *data, struct vfsmount *mnt)
 876 {
 877         int error = 0;
 878         struct super_block *sb = NULL, *new;
 879         struct gfs2_sbd *sdp;
 880         char *gfs2mnt = NULL;
 881
 882         sb = get_gfs2_sb(dev_name);
 883         if (!sb) {
 884                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 885                 error = -ENOENT;
 886                 goto error;
 887         }
 888         sdp = (struct gfs2_sbd*) sb->s_fs_info;
 889         if (sdp->sd_vfs_meta) {
 890                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 891                 error = -EBUSY;
 892                 goto error;
 893         }
 894         mutex_lock(&sb->s_bdev->bd_mount_mutex);
 895         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 896         mutex_unlock(&sb->s_bdev->bd_mount_mutex);
 897         if (IS_ERR(new)) {
 898                 error = PTR_ERR(new);
 899                 goto error;
 900         }
 901         module_put(fs_type->owner);
 902         new->s_flags = flags;
 903         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 904         sb_set_blocksize(new, sb->s_blocksize);
 905         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 906         if (error) {
 907                 up_write(&new->s_umount);
 908                 deactivate_super(new);
 909                 goto error;
 910         }
 911
 912         new->s_flags |= MS_ACTIVE;
 913
 914         /* Grab a reference to the gfs2 mount point */
 915         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 916         return simple_set_mnt(mnt, new);
 917 error:
 918         if (gfs2mnt)
 919                 kfree(gfs2mnt);
 920         return error;
 921 }
 922
 923 static void gfs2_kill_sb(struct super_block *sb)
 924 {
 925         kill_block_super(sb);
 926 }
 927
 928 static void gfs2_kill_sb_meta(struct super_block *sb)
 929 {
 930         struct gfs2_sbd *sdp = sb->s_fs_info;
 931         generic_shutdown_super(sb);
 932         sdp->sd_vfs_meta = NULL;
 933         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 934 }
 935
 936 struct file_system_type gfs2_fs_type = {
 937         .name = "gfs2",
 938         .fs_flags = FS_REQUIRES_DEV,
 939         .get_sb = gfs2_get_sb,
 940         .kill_sb = gfs2_kill_sb,
 941         .owner = THIS_MODULE,
 942 };
 943
 944 struct file_system_type gfs2meta_fs_type = {
 945         .name = "gfs2meta",
 946         .fs_flags = FS_REQUIRES_DEV,
 947         .get_sb = gfs2_get_sb_meta,
 948         .kill_sb = gfs2_kill_sb_meta,
 949         .owner = THIS_MODULE,
 950 };
 951