fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/sched.h>
  11 #include <linux/slab.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/completion.h>
  14 #include <linux/buffer_head.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/kthread.h>
  17 #include <linux/namei.h>
  18 #include <linux/mount.h>
  19 #include <linux/gfs2_ondisk.h>
  20 #include <linux/lm_interface.h>
  21
  22 #include "gfs2.h"
  23 #include "incore.h"
  24 #include "daemon.h"
  25 #include "glock.h"
  26 #include "glops.h"
  27 #include "inode.h"
  28 #include "lm.h"
  29 #include "mount.h"
  30 #include "ops_fstype.h"
  31 #include "ops_dentry.h"
  32 #include "ops_super.h"
  33 #include "recovery.h"
  34 #include "rgrp.h"
  35 #include "super.h"
  36 #include "sys.h"
  37 #include "util.h"
  38 #include "log.h"
  39
  40 #define DO 0
  41 #define UNDO 1
  42
  43 static struct gfs2_sbd *init_sbd(struct super_block *sb)
  44 {
  45         struct gfs2_sbd *sdp;
  46
  47         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
  48         if (!sdp)
  49                 return NULL;
  50
  51         sb->s_fs_info = sdp;
  52         sdp->sd_vfs = sb;
  53
  54         gfs2_tune_init(&sdp->sd_tune);
  55
  56         INIT_LIST_HEAD(&sdp->sd_reclaim_list);
  57         spin_lock_init(&sdp->sd_reclaim_lock);
  58         init_waitqueue_head(&sdp->sd_reclaim_wq);
  59
  60         mutex_init(&sdp->sd_inum_mutex);
  61         spin_lock_init(&sdp->sd_statfs_spin);
  62         mutex_init(&sdp->sd_statfs_mutex);
  63
  64         spin_lock_init(&sdp->sd_rindex_spin);
  65         mutex_init(&sdp->sd_rindex_mutex);
  66         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  67         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  68         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  69
  70         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  71         spin_lock_init(&sdp->sd_jindex_spin);
  72         mutex_init(&sdp->sd_jindex_mutex);
  73
  74         INIT_LIST_HEAD(&sdp->sd_quota_list);
  75         spin_lock_init(&sdp->sd_quota_spin);
  76         mutex_init(&sdp->sd_quota_mutex);
  77
  78         spin_lock_init(&sdp->sd_log_lock);
  79
  80         INIT_LIST_HEAD(&sdp->sd_log_le_gl);
  81         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  84         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  85
  86         mutex_init(&sdp->sd_log_reserve_mutex);
  87         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  88         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  89
  90         init_rwsem(&sdp->sd_log_flush_lock);
  91         INIT_LIST_HEAD(&sdp->sd_log_flush_list);
  92
  93         INIT_LIST_HEAD(&sdp->sd_revoke_list);
  94
  95         mutex_init(&sdp->sd_freeze_lock);
  96
  97         return sdp;
  98 }
  99
 100 static void init_vfs(struct super_block *sb, unsigned noatime)
 101 {
 102         struct gfs2_sbd *sdp = sb->s_fs_info;
 103
 104         sb->s_magic = GFS2_MAGIC;
 105         sb->s_op = &gfs2_super_ops;
 106         sb->s_export_op = &gfs2_export_ops;
 107         sb->s_time_gran = 1;
 108         sb->s_maxbytes = MAX_LFS_FILESIZE;
 109
 110         if (sb->s_flags & (MS_NOATIME | MS_NODIRATIME))
 111                 set_bit(noatime, &sdp->sd_flags);
 112
 113         /* Don't let the VFS update atimes.  GFS2 handles this itself. */
 114         sb->s_flags |= MS_NOATIME | MS_NODIRATIME;
 115 }
 116
 117 static int init_names(struct gfs2_sbd *sdp, int silent)
 118 {
 119         char *proto, *table;
 120         int error = 0;
 121
 122         proto = sdp->sd_args.ar_lockproto;
 123         table = sdp->sd_args.ar_locktable;
 124
 125         /*  Try to autodetect  */
 126
 127         if (!proto[0] || !table[0]) {
 128                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift);
 129                 if (error)
 130                         return error;
 131
 132                 error = gfs2_check_sb(sdp, &sdp->sd_sb, silent);
 133                 if (error)
 134                         goto out;
 135
 136                 if (!proto[0])
 137                         proto = sdp->sd_sb.sb_lockproto;
 138                 if (!table[0])
 139                         table = sdp->sd_sb.sb_locktable;
 140         }
 141
 142         if (!table[0])
 143                 table = sdp->sd_vfs->s_id;
 144
 145         snprintf(sdp->sd_proto_name, GFS2_FSNAME_LEN, "%s", proto);
 146         snprintf(sdp->sd_table_name, GFS2_FSNAME_LEN, "%s", table);
 147
 148         table = sdp->sd_table_name;
 149         while ((table = strchr(table, '/')))
 150                 *table = '_';
 151
 152 out:
 153         return error;
 154 }
 155
 156 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
 157                         int undo)
 158 {
 159         struct task_struct *p;
 160         int error = 0;
 161
 162         if (undo)
 163                 goto fail_trans;
 164
 165         for (sdp->sd_glockd_num = 0;
 166              sdp->sd_glockd_num < sdp->sd_args.ar_num_glockd;
 167              sdp->sd_glockd_num++) {
 168                 p = kthread_run(gfs2_glockd, sdp, "gfs2_glockd");
 169                 error = IS_ERR(p);
 170                 if (error) {
 171                         fs_err(sdp, "can't start glockd thread: %d\n", error);
 172                         goto fail;
 173                 }
 174                 sdp->sd_glockd_process[sdp->sd_glockd_num] = p;
 175         }
 176
 177         error = gfs2_glock_nq_num(sdp,
 178                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
 179                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
 180                                   mount_gh);
 181         if (error) {
 182                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
 183                 goto fail;
 184         }
 185
 186         error = gfs2_glock_nq_num(sdp,
 187                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
 188                                   LM_ST_SHARED,
 189                                   LM_FLAG_NOEXP | GL_EXACT,
 190                                   &sdp->sd_live_gh);
 191         if (error) {
 192                 fs_err(sdp, "can't acquire live glock: %d\n", error);
 193                 goto fail_mount;
 194         }
 195
 196         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
 197                                CREATE, &sdp->sd_rename_gl);
 198         if (error) {
 199                 fs_err(sdp, "can't create rename glock: %d\n", error);
 200                 goto fail_live;
 201         }
 202
 203         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
 204                                CREATE, &sdp->sd_trans_gl);
 205         if (error) {
 206                 fs_err(sdp, "can't create transaction glock: %d\n", error);
 207                 goto fail_rename;
 208         }
 209         set_bit(GLF_STICKY, &sdp->sd_trans_gl->gl_flags);
 210
 211         return 0;
 212
 213 fail_trans:
 214         gfs2_glock_put(sdp->sd_trans_gl);
 215 fail_rename:
 216         gfs2_glock_put(sdp->sd_rename_gl);
 217 fail_live:
 218         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
 219 fail_mount:
 220         gfs2_glock_dq_uninit(mount_gh);
 221 fail:
 222         while (sdp->sd_glockd_num--)
 223                 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
 224
 225         return error;
 226 }
 227
 228 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
 229                                              u64 no_addr)
 230 {
 231         return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
 232 }
 233
 234 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
 235 {
 236         struct super_block *sb = sdp->sd_vfs;
 237         struct gfs2_holder sb_gh;
 238         u64 no_addr;
 239         struct inode *inode;
 240         int error = 0;
 241
 242         if (undo) {
 243                 if (sb->s_root) {
 244                         dput(sb->s_root);
 245                         sb->s_root = NULL;
 246                 }
 247                 return 0;
 248         }
 249
 250         error = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
 251                                  LM_ST_SHARED, 0, &sb_gh);
 252         if (error) {
 253                 fs_err(sdp, "can't acquire superblock glock: %d\n", error);
 254                 return error;
 255         }
 256
 257         error = gfs2_read_sb(sdp, sb_gh.gh_gl, silent);
 258         if (error) {
 259                 fs_err(sdp, "can't read superblock: %d\n", error);
 260                 goto out;
 261         }
 262
 263         /* Set up the buffer cache and SB for real */
 264         if (sdp->sd_sb.sb_bsize < bdev_hardsect_size(sb->s_bdev)) {
 265                 error = -EINVAL;
 266                 fs_err(sdp, "FS block size (%u) is too small for device "
 267                        "block size (%u)\n",
 268                        sdp->sd_sb.sb_bsize, bdev_hardsect_size(sb->s_bdev));
 269                 goto out;
 270         }
 271         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
 272                 error = -EINVAL;
 273                 fs_err(sdp, "FS block size (%u) is too big for machine "
 274                        "page size (%u)\n",
 275                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
 276                 goto out;
 277         }
 278         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
 279
 280         /* Get the root inode */
 281         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
 282         if (sb->s_type == &gfs2meta_fs_type)
 283                 no_addr = sdp->sd_sb.sb_master_dir.no_addr;
 284         inode = gfs2_lookup_root(sb, no_addr);
 285         if (IS_ERR(inode)) {
 286                 error = PTR_ERR(inode);
 287                 fs_err(sdp, "can't read in root inode: %d\n", error);
 288                 goto out;
 289         }
 290
 291         sb->s_root = d_alloc_root(inode);
 292         if (!sb->s_root) {
 293                 fs_err(sdp, "can't get root dentry\n");
 294                 error = -ENOMEM;
 295                 iput(inode);
 296         } else
 297                 sb->s_root->d_op = &gfs2_dops;
 298
 299 out:
 300         gfs2_glock_dq_uninit(&sb_gh);
 301         return error;
 302 }
 303
 304 static int init_journal(struct gfs2_sbd *sdp, int undo)
 305 {
 306         struct gfs2_holder ji_gh;
 307         struct task_struct *p;
 308         struct gfs2_inode *ip;
 309         int jindex = 1;
 310         int error = 0;
 311
 312         if (undo) {
 313                 jindex = 0;
 314                 goto fail_recoverd;
 315         }
 316
 317         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 318         if (IS_ERR(sdp->sd_jindex)) {
 319                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 320                 return PTR_ERR(sdp->sd_jindex);
 321         }
 322         ip = GFS2_I(sdp->sd_jindex);
 323         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 324
 325         /* Load in the journal index special file */
 326
 327         error = gfs2_jindex_hold(sdp, &ji_gh);
 328         if (error) {
 329                 fs_err(sdp, "can't read journal index: %d\n", error);
 330                 goto fail;
 331         }
 332
 333         error = -EINVAL;
 334         if (!gfs2_jindex_size(sdp)) {
 335                 fs_err(sdp, "no journals!\n");
 336                 goto fail_jindex;
 337         }
 338
 339         if (sdp->sd_args.ar_spectator) {
 340                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 341                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 342         } else {
 343                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 344                         fs_err(sdp, "can't mount journal #%u\n",
 345                                sdp->sd_lockstruct.ls_jid);
 346                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 347                                gfs2_jindex_size(sdp),
 348                                gfs2_jindex_size(sdp) - 1);
 349                         goto fail_jindex;
 350                 }
 351                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 352
 353                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 354                                           &gfs2_journal_glops,
 355                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 356                                           &sdp->sd_journal_gh);
 357                 if (error) {
 358                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 359                         goto fail_jindex;
 360                 }
 361
 362                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 363                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 364                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 365                                            &sdp->sd_jinode_gh);
 366                 if (error) {
 367                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 368                                error);
 369                         goto fail_journal_gh;
 370                 }
 371
 372                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 373                 if (error) {
 374                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 375                                sdp->sd_jdesc->jd_jid, error);
 376                         goto fail_jinode_gh;
 377                 }
 378                 sdp->sd_log_blks_free = sdp->sd_jdesc->jd_blocks;
 379         }
 380
 381         if (sdp->sd_lockstruct.ls_first) {
 382                 unsigned int x;
 383                 for (x = 0; x < sdp->sd_journals; x++) {
 384                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 385                         if (error) {
 386                                 fs_err(sdp, "error recovering journal %u: %d\n",
 387                                        x, error);
 388                                 goto fail_jinode_gh;
 389                         }
 390                 }
 391
 392                 gfs2_lm_others_may_mount(sdp);
 393         } else if (!sdp->sd_args.ar_spectator) {
 394                 error = gfs2_recover_journal(sdp->sd_jdesc);
 395                 if (error) {
 396                         fs_err(sdp, "error recovering my journal: %d\n", error);
 397                         goto fail_jinode_gh;
 398                 }
 399         }
 400
 401         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 402         gfs2_glock_dq_uninit(&ji_gh);
 403         jindex = 0;
 404
 405         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 406         error = IS_ERR(p);
 407         if (error) {
 408                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 409                 goto fail_jinode_gh;
 410         }
 411         sdp->sd_recoverd_process = p;
 412
 413         return 0;
 414
 415 fail_recoverd:
 416         kthread_stop(sdp->sd_recoverd_process);
 417 fail_jinode_gh:
 418         if (!sdp->sd_args.ar_spectator)
 419                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 420 fail_journal_gh:
 421         if (!sdp->sd_args.ar_spectator)
 422                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 423 fail_jindex:
 424         gfs2_jindex_free(sdp);
 425         if (jindex)
 426                 gfs2_glock_dq_uninit(&ji_gh);
 427 fail:
 428         iput(sdp->sd_jindex);
 429         return error;
 430 }
 431
 432
 433 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 434 {
 435         int error = 0;
 436         struct gfs2_inode *ip;
 437         struct inode *inode;
 438
 439         if (undo)
 440                 goto fail_qinode;
 441
 442         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 443         if (IS_ERR(inode)) {
 444                 error = PTR_ERR(inode);
 445                 fs_err(sdp, "can't read in master directory: %d\n", error);
 446                 goto fail;
 447         }
 448         sdp->sd_master_dir = inode;
 449
 450         error = init_journal(sdp, undo);
 451         if (error)
 452                 goto fail_master;
 453
 454         /* Read in the master inode number inode */
 455         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 456         if (IS_ERR(sdp->sd_inum_inode)) {
 457                 error = PTR_ERR(sdp->sd_inum_inode);
 458                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 459                 goto fail_journal;
 460         }
 461
 462
 463         /* Read in the master statfs inode */
 464         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 465         if (IS_ERR(sdp->sd_statfs_inode)) {
 466                 error = PTR_ERR(sdp->sd_statfs_inode);
 467                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 468                 goto fail_inum;
 469         }
 470
 471         /* Read in the resource index inode */
 472         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 473         if (IS_ERR(sdp->sd_rindex)) {
 474                 error = PTR_ERR(sdp->sd_rindex);
 475                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 476                 goto fail_statfs;
 477         }
 478         ip = GFS2_I(sdp->sd_rindex);
 479         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 480         sdp->sd_rindex_vn = ip->i_gl->gl_vn - 1;
 481
 482         /* Read in the quota inode */
 483         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 484         if (IS_ERR(sdp->sd_quota_inode)) {
 485                 error = PTR_ERR(sdp->sd_quota_inode);
 486                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 487                 goto fail_rindex;
 488         }
 489         return 0;
 490
 491 fail_qinode:
 492         iput(sdp->sd_quota_inode);
 493 fail_rindex:
 494         gfs2_clear_rgrpd(sdp);
 495         iput(sdp->sd_rindex);
 496 fail_statfs:
 497         iput(sdp->sd_statfs_inode);
 498 fail_inum:
 499         iput(sdp->sd_inum_inode);
 500 fail_journal:
 501         init_journal(sdp, UNDO);
 502 fail_master:
 503         iput(sdp->sd_master_dir);
 504 fail:
 505         return error;
 506 }
 507
 508 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 509 {
 510         struct inode *pn = NULL;
 511         char buf[30];
 512         int error = 0;
 513         struct gfs2_inode *ip;
 514
 515         if (sdp->sd_args.ar_spectator)
 516                 return 0;
 517
 518         if (undo)
 519                 goto fail_qc_gh;
 520
 521         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 522         if (IS_ERR(pn)) {
 523                 error = PTR_ERR(pn);
 524                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 525                 return error;
 526         }
 527
 528         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 529         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 530         if (IS_ERR(sdp->sd_ir_inode)) {
 531                 error = PTR_ERR(sdp->sd_ir_inode);
 532                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 533                 goto fail;
 534         }
 535
 536         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 537         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 538         if (IS_ERR(sdp->sd_sc_inode)) {
 539                 error = PTR_ERR(sdp->sd_sc_inode);
 540                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 541                 goto fail_ir_i;
 542         }
 543
 544         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 545         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 546         if (IS_ERR(sdp->sd_qc_inode)) {
 547                 error = PTR_ERR(sdp->sd_qc_inode);
 548                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 549                 goto fail_ut_i;
 550         }
 551
 552         iput(pn);
 553         pn = NULL;
 554
 555         ip = GFS2_I(sdp->sd_ir_inode);
 556         error = gfs2_glock_nq_init(ip->i_gl,
 557                                    LM_ST_EXCLUSIVE, 0,
 558                                    &sdp->sd_ir_gh);
 559         if (error) {
 560                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 561                 goto fail_qc_i;
 562         }
 563
 564         ip = GFS2_I(sdp->sd_sc_inode);
 565         error = gfs2_glock_nq_init(ip->i_gl,
 566                                    LM_ST_EXCLUSIVE, 0,
 567                                    &sdp->sd_sc_gh);
 568         if (error) {
 569                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 570                 goto fail_ir_gh;
 571         }
 572
 573         ip = GFS2_I(sdp->sd_qc_inode);
 574         error = gfs2_glock_nq_init(ip->i_gl,
 575                                    LM_ST_EXCLUSIVE, 0,
 576                                    &sdp->sd_qc_gh);
 577         if (error) {
 578                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 579                 goto fail_ut_gh;
 580         }
 581
 582         return 0;
 583
 584 fail_qc_gh:
 585         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 586 fail_ut_gh:
 587         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 588 fail_ir_gh:
 589         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 590 fail_qc_i:
 591         iput(sdp->sd_qc_inode);
 592 fail_ut_i:
 593         iput(sdp->sd_sc_inode);
 594 fail_ir_i:
 595         iput(sdp->sd_ir_inode);
 596 fail:
 597         if (pn)
 598                 iput(pn);
 599         return error;
 600 }
 601
 602 static int init_threads(struct gfs2_sbd *sdp, int undo)
 603 {
 604         struct task_struct *p;
 605         int error = 0;
 606
 607         if (undo)
 608                 goto fail_quotad;
 609
 610         sdp->sd_log_flush_time = jiffies;
 611         sdp->sd_jindex_refresh_time = jiffies;
 612
 613         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 614         error = IS_ERR(p);
 615         if (error) {
 616                 fs_err(sdp, "can't start logd thread: %d\n", error);
 617                 return error;
 618         }
 619         sdp->sd_logd_process = p;
 620
 621         sdp->sd_statfs_sync_time = jiffies;
 622         sdp->sd_quota_sync_time = jiffies;
 623
 624         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 625         error = IS_ERR(p);
 626         if (error) {
 627                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 628                 goto fail;
 629         }
 630         sdp->sd_quotad_process = p;
 631
 632         return 0;
 633
 634
 635 fail_quotad:
 636         kthread_stop(sdp->sd_quotad_process);
 637 fail:
 638         kthread_stop(sdp->sd_logd_process);
 639         return error;
 640 }
 641
 642 /**
 643  * fill_super - Read in superblock
 644  * @sb: The VFS superblock
 645  * @data: Mount options
 646  * @silent: Don't complain if it's not a GFS2 filesystem
 647  *
 648  * Returns: errno
 649  */
 650
 651 static int fill_super(struct super_block *sb, void *data, int silent)
 652 {
 653         struct gfs2_sbd *sdp;
 654         struct gfs2_holder mount_gh;
 655         int error;
 656
 657         sdp = init_sbd(sb);
 658         if (!sdp) {
 659                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 660                 return -ENOMEM;
 661         }
 662
 663         error = gfs2_mount_args(sdp, (char *)data, 0);
 664         if (error) {
 665                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 666                 goto fail;
 667         }
 668
 669         init_vfs(sb, SDF_NOATIME);
 670
 671         /* Set up the buffer cache and fill in some fake block size values
 672            to allow us to read-in the on-disk superblock. */
 673         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 674         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 675         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 676                                GFS2_BASIC_BLOCK_SHIFT;
 677         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 678
 679         error = init_names(sdp, silent);
 680         if (error)
 681                 goto fail;
 682
 683         gfs2_create_debugfs_file(sdp);
 684
 685         error = gfs2_sys_fs_add(sdp);
 686         if (error)
 687                 goto fail;
 688
 689         error = gfs2_lm_mount(sdp, silent);
 690         if (error)
 691                 goto fail_sys;
 692
 693         error = init_locking(sdp, &mount_gh, DO);
 694         if (error)
 695                 goto fail_lm;
 696
 697         error = init_sb(sdp, silent, DO);
 698         if (error)
 699                 goto fail_locking;
 700
 701         error = init_inodes(sdp, DO);
 702         if (error)
 703                 goto fail_sb;
 704
 705         error = init_per_node(sdp, DO);
 706         if (error)
 707                 goto fail_inodes;
 708
 709         error = gfs2_statfs_init(sdp);
 710         if (error) {
 711                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 712                 goto fail_per_node;
 713         }
 714
 715         error = init_threads(sdp, DO);
 716         if (error)
 717                 goto fail_per_node;
 718
 719         if (!(sb->s_flags & MS_RDONLY)) {
 720                 error = gfs2_make_fs_rw(sdp);
 721                 if (error) {
 722                         fs_err(sdp, "can't make FS RW: %d\n", error);
 723                         goto fail_threads;
 724                 }
 725         }
 726
 727         gfs2_glock_dq_uninit(&mount_gh);
 728
 729         return 0;
 730
 731 fail_threads:
 732         init_threads(sdp, UNDO);
 733 fail_per_node:
 734         init_per_node(sdp, UNDO);
 735 fail_inodes:
 736         init_inodes(sdp, UNDO);
 737 fail_sb:
 738         init_sb(sdp, 0, UNDO);
 739 fail_locking:
 740         init_locking(sdp, &mount_gh, UNDO);
 741 fail_lm:
 742         gfs2_gl_hash_clear(sdp, WAIT);
 743         gfs2_lm_unmount(sdp);
 744         while (invalidate_inodes(sb))
 745                 yield();
 746 fail_sys:
 747         gfs2_sys_fs_del(sdp);
 748 fail:
 749         gfs2_delete_debugfs_file(sdp);
 750         kfree(sdp);
 751         sb->s_fs_info = NULL;
 752         return error;
 753 }
 754
 755 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 756                 const char *dev_name, void *data, struct vfsmount *mnt)
 757 {
 758         struct super_block *sb;
 759         struct gfs2_sbd *sdp;
 760         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 761         if (error)
 762                 goto out;
 763         sb = mnt->mnt_sb;
 764         sdp = sb->s_fs_info;
 765         sdp->sd_gfs2mnt = mnt;
 766 out:
 767         return error;
 768 }
 769
 770 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 771                            void *data, int silent)
 772 {
 773         struct gfs2_sbd *sdp = sb->s_fs_info;
 774         struct inode *inode;
 775         int error = 0;
 776
 777         new->s_fs_info = sdp;
 778         sdp->sd_vfs_meta = sb;
 779
 780         init_vfs(new, SDF_NOATIME);
 781
 782         /* Get the master inode */
 783         inode = igrab(sdp->sd_master_dir);
 784
 785         new->s_root = d_alloc_root(inode);
 786         if (!new->s_root) {
 787                 fs_err(sdp, "can't get root dentry\n");
 788                 error = -ENOMEM;
 789                 iput(inode);
 790         } else
 791                 new->s_root->d_op = &gfs2_dops;
 792
 793         return error;
 794 }
 795
 796 static int set_bdev_super(struct super_block *s, void *data)
 797 {
 798         s->s_bdev = data;
 799         s->s_dev = s->s_bdev->bd_dev;
 800         return 0;
 801 }
 802
 803 static int test_bdev_super(struct super_block *s, void *data)
 804 {
 805         return s->s_bdev == data;
 806 }
 807
 808 static struct super_block* get_gfs2_sb(const char *dev_name)
 809 {
 810         struct kstat stat;
 811         struct nameidata nd;
 812         struct file_system_type *fstype;
 813         struct super_block *sb = NULL, *s;
 814         int error;
 815
 816         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 817         if (error) {
 818                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 819                        dev_name);
 820                 goto out;
 821         }
 822         error = vfs_getattr(nd.mnt, nd.dentry, &stat);
 823
 824         fstype = get_fs_type("gfs2");
 825         list_for_each_entry(s, &fstype->fs_supers, s_instances) {
 826                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 827                     (S_ISDIR(stat.mode) && s == nd.dentry->d_inode->i_sb)) {
 828                         sb = s;
 829                         goto free_nd;
 830                 }
 831         }
 832
 833         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 834                "mount point %s\n", dev_name);
 835
 836 free_nd:
 837         path_release(&nd);
 838 out:
 839         return sb;
 840 }
 841
 842 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 843                             const char *dev_name, void *data, struct vfsmount *mnt)
 844 {
 845         int error = 0;
 846         struct super_block *sb = NULL, *new;
 847         struct gfs2_sbd *sdp;
 848
 849         sb = get_gfs2_sb(dev_name);
 850         if (!sb) {
 851                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 852                 error = -ENOENT;
 853                 goto error;
 854         }
 855         sdp = sb->s_fs_info;
 856         if (sdp->sd_vfs_meta) {
 857                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 858                 error = -EBUSY;
 859                 goto error;
 860         }
 861         down(&sb->s_bdev->bd_mount_sem);
 862         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 863         up(&sb->s_bdev->bd_mount_sem);
 864         if (IS_ERR(new)) {
 865                 error = PTR_ERR(new);
 866                 goto error;
 867         }
 868         module_put(fs_type->owner);
 869         new->s_flags = flags;
 870         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
 871         sb_set_blocksize(new, sb->s_blocksize);
 872         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
 873         if (error) {
 874                 up_write(&new->s_umount);
 875                 deactivate_super(new);
 876                 goto error;
 877         }
 878
 879         new->s_flags |= MS_ACTIVE;
 880
 881         /* Grab a reference to the gfs2 mount point */
 882         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
 883         return simple_set_mnt(mnt, new);
 884 error:
 885         return error;
 886 }
 887
 888 static void gfs2_kill_sb(struct super_block *sb)
 889 {
 890         gfs2_delete_debugfs_file(sb->s_fs_info);
 891         gfs2_meta_syncfs(sb->s_fs_info);
 892         kill_block_super(sb);
 893 }
 894
 895 static void gfs2_kill_sb_meta(struct super_block *sb)
 896 {
 897         struct gfs2_sbd *sdp = sb->s_fs_info;
 898         generic_shutdown_super(sb);
 899         sdp->sd_vfs_meta = NULL;
 900         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
 901 }
 902
 903 struct file_system_type gfs2_fs_type = {
 904         .name = "gfs2",
 905         .fs_flags = FS_REQUIRES_DEV,
 906         .get_sb = gfs2_get_sb,
 907         .kill_sb = gfs2_kill_sb,
 908         .owner = THIS_MODULE,
 909 };
 910
 911 struct file_system_type gfs2meta_fs_type = {
 912         .name = "gfs2meta",
 913         .fs_flags = FS_REQUIRES_DEV,
 914         .get_sb = gfs2_get_sb_meta,
 915         .kill_sb = gfs2_kill_sb_meta,
 916         .owner = THIS_MODULE,
 917 };
 918