SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/gfs2/ops_fstype.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2008 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 "bmap.h"
  25 #include "daemon.h"
  26 #include "glock.h"
  27 #include "glops.h"
  28 #include "inode.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
  63         spin_lock_init(&sdp->sd_rindex_spin);
  64         mutex_init(&sdp->sd_rindex_mutex);
  65         INIT_LIST_HEAD(&sdp->sd_rindex_list);
  66         INIT_LIST_HEAD(&sdp->sd_rindex_mru_list);
  67         INIT_LIST_HEAD(&sdp->sd_rindex_recent_list);
  68
  69         INIT_LIST_HEAD(&sdp->sd_jindex_list);
  70         spin_lock_init(&sdp->sd_jindex_spin);
  71         mutex_init(&sdp->sd_jindex_mutex);
  72
  73         INIT_LIST_HEAD(&sdp->sd_quota_list);
  74         spin_lock_init(&sdp->sd_quota_spin);
  75         mutex_init(&sdp->sd_quota_mutex);
  76
  77         spin_lock_init(&sdp->sd_log_lock);
  78
  79         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
  80         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
  81         INIT_LIST_HEAD(&sdp->sd_log_le_rg);
  82         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
  83         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
  84
  85         mutex_init(&sdp->sd_log_reserve_mutex);
  86         INIT_LIST_HEAD(&sdp->sd_ail1_list);
  87         INIT_LIST_HEAD(&sdp->sd_ail2_list);
  88
  89         init_rwsem(&sdp->sd_log_flush_lock);
  90         atomic_set(&sdp->sd_log_in_flight, 0);
  91         init_waitqueue_head(&sdp->sd_log_flush_wait);
  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         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
 146         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
 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, 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 /**
 305  * map_journal_extents - create a reusable "extent" mapping from all logical
 306  * blocks to all physical blocks for the given journal.  This will save
 307  * us time when writing journal blocks.  Most journals will have only one
 308  * extent that maps all their logical blocks.  That's because gfs2.mkfs
 309  * arranges the journal blocks sequentially to maximize performance.
 310  * So the extent would map the first block for the entire file length.
 311  * However, gfs2_jadd can happen while file activity is happening, so
 312  * those journals may not be sequential.  Less likely is the case where
 313  * the users created their own journals by mounting the metafs and
 314  * laying it out.  But it's still possible.  These journals might have
 315  * several extents.
 316  *
 317  * TODO: This should be done in bigger chunks rather than one block at a time,
 318  *       but since it's only done at mount time, I'm not worried about the
 319  *       time it takes.
 320  */
 321 static int map_journal_extents(struct gfs2_sbd *sdp)
 322 {
 323         struct gfs2_jdesc *jd = sdp->sd_jdesc;
 324         unsigned int lb;
 325         u64 db, prev_db; /* logical block, disk block, prev disk block */
 326         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
 327         struct gfs2_journal_extent *jext = NULL;
 328         struct buffer_head bh;
 329         int rc = 0;
 330
 331         prev_db = 0;
 332
 333         for (lb = 0; lb < ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; lb++) {
 334                 bh.b_state = 0;
 335                 bh.b_blocknr = 0;
 336                 bh.b_size = 1 << ip->i_inode.i_blkbits;
 337                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
 338                 db = bh.b_blocknr;
 339                 if (rc || !db) {
 340                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
 341                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
 342                         break;
 343                 }
 344                 if (!prev_db || db != prev_db + 1) {
 345                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
 346                                        GFP_KERNEL);
 347                         if (!jext) {
 348                                 printk(KERN_INFO "GFS2 error: out of memory "
 349                                        "mapping journal extents.\n");
 350                                 rc = -ENOMEM;
 351                                 break;
 352                         }
 353                         jext->dblock = db;
 354                         jext->lblock = lb;
 355                         jext->blocks = 1;
 356                         list_add_tail(&jext->extent_list, &jd->extent_list);
 357                 } else {
 358                         jext->blocks++;
 359                 }
 360                 prev_db = db;
 361         }
 362         return rc;
 363 }
 364
 365 static void gfs2_lm_others_may_mount(struct gfs2_sbd *sdp)
 366 {
 367         if (!sdp->sd_lockstruct.ls_ops->lm_others_may_mount)
 368                 return;
 369         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 370                 sdp->sd_lockstruct.ls_ops->lm_others_may_mount(
 371                                         sdp->sd_lockstruct.ls_lockspace);
 372 }
 373
 374 static int init_journal(struct gfs2_sbd *sdp, int undo)
 375 {
 376         struct gfs2_holder ji_gh;
 377         struct task_struct *p;
 378         struct gfs2_inode *ip;
 379         int jindex = 1;
 380         int error = 0;
 381
 382         if (undo) {
 383                 jindex = 0;
 384                 goto fail_recoverd;
 385         }
 386
 387         sdp->sd_jindex = gfs2_lookup_simple(sdp->sd_master_dir, "jindex");
 388         if (IS_ERR(sdp->sd_jindex)) {
 389                 fs_err(sdp, "can't lookup journal index: %d\n", error);
 390                 return PTR_ERR(sdp->sd_jindex);
 391         }
 392         ip = GFS2_I(sdp->sd_jindex);
 393         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 394
 395         /* Load in the journal index special file */
 396
 397         error = gfs2_jindex_hold(sdp, &ji_gh);
 398         if (error) {
 399                 fs_err(sdp, "can't read journal index: %d\n", error);
 400                 goto fail;
 401         }
 402
 403         error = -EINVAL;
 404         if (!gfs2_jindex_size(sdp)) {
 405                 fs_err(sdp, "no journals!\n");
 406                 goto fail_jindex;
 407         }
 408
 409         if (sdp->sd_args.ar_spectator) {
 410                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
 411                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 412         } else {
 413                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
 414                         fs_err(sdp, "can't mount journal #%u\n",
 415                                sdp->sd_lockstruct.ls_jid);
 416                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
 417                                gfs2_jindex_size(sdp),
 418                                gfs2_jindex_size(sdp) - 1);
 419                         goto fail_jindex;
 420                 }
 421                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
 422
 423                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
 424                                           &gfs2_journal_glops,
 425                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
 426                                           &sdp->sd_journal_gh);
 427                 if (error) {
 428                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
 429                         goto fail_jindex;
 430                 }
 431
 432                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
 433                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
 434                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
 435                                            &sdp->sd_jinode_gh);
 436                 if (error) {
 437                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
 438                                error);
 439                         goto fail_journal_gh;
 440                 }
 441
 442                 error = gfs2_jdesc_check(sdp->sd_jdesc);
 443                 if (error) {
 444                         fs_err(sdp, "my journal (%u) is bad: %d\n",
 445                                sdp->sd_jdesc->jd_jid, error);
 446                         goto fail_jinode_gh;
 447                 }
 448                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
 449
 450                 /* Map the extents for this journal's blocks */
 451                 map_journal_extents(sdp);
 452         }
 453
 454         if (sdp->sd_lockstruct.ls_first) {
 455                 unsigned int x;
 456                 for (x = 0; x < sdp->sd_journals; x++) {
 457                         error = gfs2_recover_journal(gfs2_jdesc_find(sdp, x));
 458                         if (error) {
 459                                 fs_err(sdp, "error recovering journal %u: %d\n",
 460                                        x, error);
 461                                 goto fail_jinode_gh;
 462                         }
 463                 }
 464
 465                 gfs2_lm_others_may_mount(sdp);
 466         } else if (!sdp->sd_args.ar_spectator) {
 467                 error = gfs2_recover_journal(sdp->sd_jdesc);
 468                 if (error) {
 469                         fs_err(sdp, "error recovering my journal: %d\n", error);
 470                         goto fail_jinode_gh;
 471                 }
 472         }
 473
 474         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
 475         gfs2_glock_dq_uninit(&ji_gh);
 476         jindex = 0;
 477
 478         p = kthread_run(gfs2_recoverd, sdp, "gfs2_recoverd");
 479         error = IS_ERR(p);
 480         if (error) {
 481                 fs_err(sdp, "can't start recoverd thread: %d\n", error);
 482                 goto fail_jinode_gh;
 483         }
 484         sdp->sd_recoverd_process = p;
 485
 486         return 0;
 487
 488 fail_recoverd:
 489         kthread_stop(sdp->sd_recoverd_process);
 490 fail_jinode_gh:
 491         if (!sdp->sd_args.ar_spectator)
 492                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 493 fail_journal_gh:
 494         if (!sdp->sd_args.ar_spectator)
 495                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
 496 fail_jindex:
 497         gfs2_jindex_free(sdp);
 498         if (jindex)
 499                 gfs2_glock_dq_uninit(&ji_gh);
 500 fail:
 501         iput(sdp->sd_jindex);
 502         return error;
 503 }
 504
 505
 506 static int init_inodes(struct gfs2_sbd *sdp, int undo)
 507 {
 508         int error = 0;
 509         struct gfs2_inode *ip;
 510         struct inode *inode;
 511
 512         if (undo)
 513                 goto fail_qinode;
 514
 515         inode = gfs2_lookup_root(sdp->sd_vfs, sdp->sd_sb.sb_master_dir.no_addr);
 516         if (IS_ERR(inode)) {
 517                 error = PTR_ERR(inode);
 518                 fs_err(sdp, "can't read in master directory: %d\n", error);
 519                 goto fail;
 520         }
 521         sdp->sd_master_dir = inode;
 522
 523         error = init_journal(sdp, undo);
 524         if (error)
 525                 goto fail_master;
 526
 527         /* Read in the master inode number inode */
 528         sdp->sd_inum_inode = gfs2_lookup_simple(sdp->sd_master_dir, "inum");
 529         if (IS_ERR(sdp->sd_inum_inode)) {
 530                 error = PTR_ERR(sdp->sd_inum_inode);
 531                 fs_err(sdp, "can't read in inum inode: %d\n", error);
 532                 goto fail_journal;
 533         }
 534
 535
 536         /* Read in the master statfs inode */
 537         sdp->sd_statfs_inode = gfs2_lookup_simple(sdp->sd_master_dir, "statfs");
 538         if (IS_ERR(sdp->sd_statfs_inode)) {
 539                 error = PTR_ERR(sdp->sd_statfs_inode);
 540                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
 541                 goto fail_inum;
 542         }
 543
 544         /* Read in the resource index inode */
 545         sdp->sd_rindex = gfs2_lookup_simple(sdp->sd_master_dir, "rindex");
 546         if (IS_ERR(sdp->sd_rindex)) {
 547                 error = PTR_ERR(sdp->sd_rindex);
 548                 fs_err(sdp, "can't get resource index inode: %d\n", error);
 549                 goto fail_statfs;
 550         }
 551         ip = GFS2_I(sdp->sd_rindex);
 552         set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
 553         sdp->sd_rindex_uptodate = 0;
 554
 555         /* Read in the quota inode */
 556         sdp->sd_quota_inode = gfs2_lookup_simple(sdp->sd_master_dir, "quota");
 557         if (IS_ERR(sdp->sd_quota_inode)) {
 558                 error = PTR_ERR(sdp->sd_quota_inode);
 559                 fs_err(sdp, "can't get quota file inode: %d\n", error);
 560                 goto fail_rindex;
 561         }
 562         return 0;
 563
 564 fail_qinode:
 565         iput(sdp->sd_quota_inode);
 566 fail_rindex:
 567         gfs2_clear_rgrpd(sdp);
 568         iput(sdp->sd_rindex);
 569 fail_statfs:
 570         iput(sdp->sd_statfs_inode);
 571 fail_inum:
 572         iput(sdp->sd_inum_inode);
 573 fail_journal:
 574         init_journal(sdp, UNDO);
 575 fail_master:
 576         iput(sdp->sd_master_dir);
 577 fail:
 578         return error;
 579 }
 580
 581 static int init_per_node(struct gfs2_sbd *sdp, int undo)
 582 {
 583         struct inode *pn = NULL;
 584         char buf[30];
 585         int error = 0;
 586         struct gfs2_inode *ip;
 587
 588         if (sdp->sd_args.ar_spectator)
 589                 return 0;
 590
 591         if (undo)
 592                 goto fail_qc_gh;
 593
 594         pn = gfs2_lookup_simple(sdp->sd_master_dir, "per_node");
 595         if (IS_ERR(pn)) {
 596                 error = PTR_ERR(pn);
 597                 fs_err(sdp, "can't find per_node directory: %d\n", error);
 598                 return error;
 599         }
 600
 601         sprintf(buf, "inum_range%u", sdp->sd_jdesc->jd_jid);
 602         sdp->sd_ir_inode = gfs2_lookup_simple(pn, buf);
 603         if (IS_ERR(sdp->sd_ir_inode)) {
 604                 error = PTR_ERR(sdp->sd_ir_inode);
 605                 fs_err(sdp, "can't find local \"ir\" file: %d\n", error);
 606                 goto fail;
 607         }
 608
 609         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
 610         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
 611         if (IS_ERR(sdp->sd_sc_inode)) {
 612                 error = PTR_ERR(sdp->sd_sc_inode);
 613                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
 614                 goto fail_ir_i;
 615         }
 616
 617         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
 618         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
 619         if (IS_ERR(sdp->sd_qc_inode)) {
 620                 error = PTR_ERR(sdp->sd_qc_inode);
 621                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
 622                 goto fail_ut_i;
 623         }
 624
 625         iput(pn);
 626         pn = NULL;
 627
 628         ip = GFS2_I(sdp->sd_ir_inode);
 629         error = gfs2_glock_nq_init(ip->i_gl,
 630                                    LM_ST_EXCLUSIVE, 0,
 631                                    &sdp->sd_ir_gh);
 632         if (error) {
 633                 fs_err(sdp, "can't lock local \"ir\" file: %d\n", error);
 634                 goto fail_qc_i;
 635         }
 636
 637         ip = GFS2_I(sdp->sd_sc_inode);
 638         error = gfs2_glock_nq_init(ip->i_gl,
 639                                    LM_ST_EXCLUSIVE, 0,
 640                                    &sdp->sd_sc_gh);
 641         if (error) {
 642                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
 643                 goto fail_ir_gh;
 644         }
 645
 646         ip = GFS2_I(sdp->sd_qc_inode);
 647         error = gfs2_glock_nq_init(ip->i_gl,
 648                                    LM_ST_EXCLUSIVE, 0,
 649                                    &sdp->sd_qc_gh);
 650         if (error) {
 651                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
 652                 goto fail_ut_gh;
 653         }
 654
 655         return 0;
 656
 657 fail_qc_gh:
 658         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
 659 fail_ut_gh:
 660         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
 661 fail_ir_gh:
 662         gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
 663 fail_qc_i:
 664         iput(sdp->sd_qc_inode);
 665 fail_ut_i:
 666         iput(sdp->sd_sc_inode);
 667 fail_ir_i:
 668         iput(sdp->sd_ir_inode);
 669 fail:
 670         if (pn)
 671                 iput(pn);
 672         return error;
 673 }
 674
 675 static int init_threads(struct gfs2_sbd *sdp, int undo)
 676 {
 677         struct task_struct *p;
 678         int error = 0;
 679
 680         if (undo)
 681                 goto fail_quotad;
 682
 683         sdp->sd_log_flush_time = jiffies;
 684         sdp->sd_jindex_refresh_time = jiffies;
 685
 686         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
 687         error = IS_ERR(p);
 688         if (error) {
 689                 fs_err(sdp, "can't start logd thread: %d\n", error);
 690                 return error;
 691         }
 692         sdp->sd_logd_process = p;
 693
 694         sdp->sd_statfs_sync_time = jiffies;
 695         sdp->sd_quota_sync_time = jiffies;
 696
 697         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
 698         error = IS_ERR(p);
 699         if (error) {
 700                 fs_err(sdp, "can't start quotad thread: %d\n", error);
 701                 goto fail;
 702         }
 703         sdp->sd_quotad_process = p;
 704
 705         return 0;
 706
 707
 708 fail_quotad:
 709         kthread_stop(sdp->sd_quotad_process);
 710 fail:
 711         kthread_stop(sdp->sd_logd_process);
 712         return error;
 713 }
 714
 715 /**
 716  * gfs2_lm_mount - mount a locking protocol
 717  * @sdp: the filesystem
 718  * @args: mount arguements
 719  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
 720  *
 721  * Returns: errno
 722  */
 723
 724 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
 725 {
 726         char *proto = sdp->sd_proto_name;
 727         char *table = sdp->sd_table_name;
 728         int flags = LM_MFLAG_CONV_NODROP;
 729         int error;
 730
 731         if (sdp->sd_args.ar_spectator)
 732                 flags |= LM_MFLAG_SPECTATOR;
 733
 734         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
 735
 736         error = gfs2_mount_lockproto(proto, table, sdp->sd_args.ar_hostdata,
 737                                      gfs2_glock_cb, sdp,
 738                                      GFS2_MIN_LVB_SIZE, flags,
 739                                      &sdp->sd_lockstruct, &sdp->sd_kobj);
 740         if (error) {
 741                 fs_info(sdp, "can't mount proto=%s, table=%s, hostdata=%s\n",
 742                         proto, table, sdp->sd_args.ar_hostdata);
 743                 goto out;
 744         }
 745
 746         if (gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_ops) ||
 747             gfs2_assert_warn(sdp, sdp->sd_lockstruct.ls_lvb_size >=
 748                                   GFS2_MIN_LVB_SIZE)) {
 749                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
 750                 goto out;
 751         }
 752
 753         if (sdp->sd_args.ar_spectator)
 754                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s", table);
 755         else
 756                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u", table,
 757                          sdp->sd_lockstruct.ls_jid);
 758
 759         fs_info(sdp, "Joined cluster. Now mounting FS...\n");
 760
 761         if ((sdp->sd_lockstruct.ls_flags & LM_LSFLAG_LOCAL) &&
 762             !sdp->sd_args.ar_ignore_local_fs) {
 763                 sdp->sd_args.ar_localflocks = 1;
 764                 sdp->sd_args.ar_localcaching = 1;
 765         }
 766
 767 out:
 768         return error;
 769 }
 770
 771 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
 772 {
 773         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
 774                 gfs2_unmount_lockproto(&sdp->sd_lockstruct);
 775 }
 776
 777 /**
 778  * fill_super - Read in superblock
 779  * @sb: The VFS superblock
 780  * @data: Mount options
 781  * @silent: Don't complain if it's not a GFS2 filesystem
 782  *
 783  * Returns: errno
 784  */
 785
 786 static int fill_super(struct super_block *sb, void *data, int silent)
 787 {
 788         struct gfs2_sbd *sdp;
 789         struct gfs2_holder mount_gh;
 790         int error;
 791
 792         sdp = init_sbd(sb);
 793         if (!sdp) {
 794                 printk(KERN_WARNING "GFS2: can't alloc struct gfs2_sbd\n");
 795                 return -ENOMEM;
 796         }
 797
 798         error = gfs2_mount_args(sdp, (char *)data, 0);
 799         if (error) {
 800                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
 801                 goto fail;
 802         }
 803
 804         init_vfs(sb, SDF_NOATIME);
 805
 806         /* Set up the buffer cache and fill in some fake block size values
 807            to allow us to read-in the on-disk superblock. */
 808         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
 809         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
 810         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
 811                                GFS2_BASIC_BLOCK_SHIFT;
 812         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
 813
 814         error = init_names(sdp, silent);
 815         if (error)
 816                 goto fail;
 817
 818         gfs2_create_debugfs_file(sdp);
 819
 820         error = gfs2_sys_fs_add(sdp);
 821         if (error)
 822                 goto fail;
 823
 824         error = gfs2_lm_mount(sdp, silent);
 825         if (error)
 826                 goto fail_sys;
 827
 828         error = init_locking(sdp, &mount_gh, DO);
 829         if (error)
 830                 goto fail_lm;
 831
 832         error = init_sb(sdp, silent, DO);
 833         if (error)
 834                 goto fail_locking;
 835
 836         error = init_inodes(sdp, DO);
 837         if (error)
 838                 goto fail_sb;
 839
 840         error = init_per_node(sdp, DO);
 841         if (error)
 842                 goto fail_inodes;
 843
 844         error = gfs2_statfs_init(sdp);
 845         if (error) {
 846                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
 847                 goto fail_per_node;
 848         }
 849
 850         error = init_threads(sdp, DO);
 851         if (error)
 852                 goto fail_per_node;
 853
 854         if (!(sb->s_flags & MS_RDONLY)) {
 855                 error = gfs2_make_fs_rw(sdp);
 856                 if (error) {
 857                         fs_err(sdp, "can't make FS RW: %d\n", error);
 858                         goto fail_threads;
 859                 }
 860         }
 861
 862         gfs2_glock_dq_uninit(&mount_gh);
 863
 864         return 0;
 865
 866 fail_threads:
 867         init_threads(sdp, UNDO);
 868 fail_per_node:
 869         init_per_node(sdp, UNDO);
 870 fail_inodes:
 871         init_inodes(sdp, UNDO);
 872 fail_sb:
 873         init_sb(sdp, 0, UNDO);
 874 fail_locking:
 875         init_locking(sdp, &mount_gh, UNDO);
 876 fail_lm:
 877         gfs2_gl_hash_clear(sdp);
 878         gfs2_lm_unmount(sdp);
 879         while (invalidate_inodes(sb))
 880                 yield();
 881 fail_sys:
 882         gfs2_sys_fs_del(sdp);
 883 fail:
 884         gfs2_delete_debugfs_file(sdp);
 885         kfree(sdp);
 886         sb->s_fs_info = NULL;
 887         return error;
 888 }
 889
 890 static int gfs2_get_sb(struct file_system_type *fs_type, int flags,
 891                 const char *dev_name, void *data, struct vfsmount *mnt)
 892 {
 893         struct super_block *sb;
 894         struct gfs2_sbd *sdp;
 895         int error = get_sb_bdev(fs_type, flags, dev_name, data, fill_super, mnt);
 896         if (error)
 897                 goto out;
 898         sb = mnt->mnt_sb;
 899         sdp = sb->s_fs_info;
 900         sdp->sd_gfs2mnt = mnt;
 901 out:
 902         return error;
 903 }
 904
 905 static int fill_super_meta(struct super_block *sb, struct super_block *new,
 906                            void *data, int silent)
 907 {
 908         struct gfs2_sbd *sdp = sb->s_fs_info;
 909         struct inode *inode;
 910         int error = 0;
 911
 912         new->s_fs_info = sdp;
 913         sdp->sd_vfs_meta = sb;
 914
 915         init_vfs(new, SDF_NOATIME);
 916
 917         /* Get the master inode */
 918         inode = igrab(sdp->sd_master_dir);
 919
 920         new->s_root = d_alloc_root(inode);
 921         if (!new->s_root) {
 922                 fs_err(sdp, "can't get root dentry\n");
 923                 error = -ENOMEM;
 924                 iput(inode);
 925         } else
 926                 new->s_root->d_op = &gfs2_dops;
 927
 928         return error;
 929 }
 930
 931 static int set_bdev_super(struct super_block *s, void *data)
 932 {
 933         s->s_bdev = data;
 934         s->s_dev = s->s_bdev->bd_dev;
 935         return 0;
 936 }
 937
 938 static int test_bdev_super(struct super_block *s, void *data)
 939 {
 940         return s->s_bdev == data;
 941 }
 942
 943 static struct super_block* get_gfs2_sb(const char *dev_name)
 944 {
 945         struct kstat stat;
 946         struct nameidata nd;
 947         struct super_block *sb = NULL, *s;
 948         int error;
 949
 950         error = path_lookup(dev_name, LOOKUP_FOLLOW, &nd);
 951         if (error) {
 952                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error\n",
 953                        dev_name);
 954                 goto out;
 955         }
 956         error = vfs_getattr(nd.path.mnt, nd.path.dentry, &stat);
 957
 958         list_for_each_entry(s, &gfs2_fs_type.fs_supers, s_instances) {
 959                 if ((S_ISBLK(stat.mode) && s->s_dev == stat.rdev) ||
 960                     (S_ISDIR(stat.mode) &&
 961                      s == nd.path.dentry->d_inode->i_sb)) {
 962                         sb = s;
 963                         goto free_nd;
 964                 }
 965         }
 966
 967         printk(KERN_WARNING "GFS2: Unrecognized block device or "
 968                "mount point %s\n", dev_name);
 969
 970 free_nd:
 971         path_put(&nd.path);
 972 out:
 973         return sb;
 974 }
 975
 976 static int gfs2_get_sb_meta(struct file_system_type *fs_type, int flags,
 977                             const char *dev_name, void *data, struct vfsmount *mnt)
 978 {
 979         int error = 0;
 980         struct super_block *sb = NULL, *new;
 981         struct gfs2_sbd *sdp;
 982
 983         sb = get_gfs2_sb(dev_name);
 984         if (!sb) {
 985                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
 986                 error = -ENOENT;
 987                 goto error;
 988         }
 989         sdp = sb->s_fs_info;
 990         if (sdp->sd_vfs_meta) {
 991                 printk(KERN_WARNING "GFS2: gfs2meta mount already exists\n");
 992                 error = -EBUSY;
 993                 goto error;
 994         }
 995         down(&sb->s_bdev->bd_mount_sem);
 996         new = sget(fs_type, test_bdev_super, set_bdev_super, sb->s_bdev);
 997         up(&sb->s_bdev->bd_mount_sem);
 998         if (IS_ERR(new)) {
 999                 error = PTR_ERR(new);
1000                 goto error;
1001         }
1002         new->s_flags = flags;
1003         strlcpy(new->s_id, sb->s_id, sizeof(new->s_id));
1004         sb_set_blocksize(new, sb->s_blocksize);
1005         error = fill_super_meta(sb, new, data, flags & MS_SILENT ? 1 : 0);
1006         if (error) {
1007                 up_write(&new->s_umount);
1008                 deactivate_super(new);
1009                 goto error;
1010         }
1011
1012         new->s_flags |= MS_ACTIVE;
1013
1014         /* Grab a reference to the gfs2 mount point */
1015         atomic_inc(&sdp->sd_gfs2mnt->mnt_count);
1016         return simple_set_mnt(mnt, new);
1017 error:
1018         return error;
1019 }
1020
1021 static void gfs2_kill_sb(struct super_block *sb)
1022 {
1023         if (sb->s_fs_info) {
1024                 gfs2_delete_debugfs_file(sb->s_fs_info);
1025                 gfs2_meta_syncfs(sb->s_fs_info);
1026         }
1027         kill_block_super(sb);
1028 }
1029
1030 static void gfs2_kill_sb_meta(struct super_block *sb)
1031 {
1032         struct gfs2_sbd *sdp = sb->s_fs_info;
1033         generic_shutdown_super(sb);
1034         sdp->sd_vfs_meta = NULL;
1035         atomic_dec(&sdp->sd_gfs2mnt->mnt_count);
1036 }
1037
1038 struct file_system_type gfs2_fs_type = {
1039         .name = "gfs2",
1040         .fs_flags = FS_REQUIRES_DEV,
1041         .get_sb = gfs2_get_sb,
1042         .kill_sb = gfs2_kill_sb,
1043         .owner = THIS_MODULE,
1044 };
1045
1046 struct file_system_type gfs2meta_fs_type = {
1047         .name = "gfs2meta",
1048         .fs_flags = FS_REQUIRES_DEV,
1049         .get_sb = gfs2_get_sb_meta,
1050         .kill_sb = gfs2_kill_sb_meta,
1051         .owner = THIS_MODULE,
1052 };
1053