fs/ocfs2/super.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * super.c
   5  *
   6  * load/unload driver, mount/dismount volumes
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/types.h>
  29 #include <linux/slab.h>
  30 #include <linux/highmem.h>
  31 #include <linux/utsname.h>
  32 #include <linux/init.h>
  33 #include <linux/random.h>
  34 #include <linux/statfs.h>
  35 #include <linux/moduleparam.h>
  36 #include <linux/blkdev.h>
  37 #include <linux/socket.h>
  38 #include <linux/inet.h>
  39 #include <linux/parser.h>
  40 #include <linux/crc32.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/mount.h>
  43 #include <linux/seq_file.h>
  44
  45 #define MLOG_MASK_PREFIX ML_SUPER
  46 #include <cluster/masklog.h>
  47
  48 #include "ocfs2.h"
  49
  50 /* this should be the only file to include a version 1 header */
  51 #include "ocfs1_fs_compat.h"
  52
  53 #include "alloc.h"
  54 #include "dlmglue.h"
  55 #include "export.h"
  56 #include "extent_map.h"
  57 #include "heartbeat.h"
  58 #include "inode.h"
  59 #include "journal.h"
  60 #include "localalloc.h"
  61 #include "namei.h"
  62 #include "slot_map.h"
  63 #include "super.h"
  64 #include "sysfile.h"
  65 #include "uptodate.h"
  66 #include "ver.h"
  67 #include "xattr.h"
  68 #include "quota.h"
  69
  70 #include "buffer_head_io.h"
  71
  72 static struct kmem_cache *ocfs2_inode_cachep = NULL;
  73 struct kmem_cache *ocfs2_dquot_cachep;
  74 struct kmem_cache *ocfs2_qf_chunk_cachep;
  75
  76 /* OCFS2 needs to schedule several differnt types of work which
  77  * require cluster locking, disk I/O, recovery waits, etc. Since these
  78  * types of work tend to be heavy we avoid using the kernel events
  79  * workqueue and schedule on our own. */
  80 struct workqueue_struct *ocfs2_wq = NULL;
  81
  82 static struct dentry *ocfs2_debugfs_root = NULL;
  83
  84 MODULE_AUTHOR("Oracle");
  85 MODULE_LICENSE("GPL");
  86
  87 struct mount_options
  88 {
  89         unsigned long   commit_interval;
  90         unsigned long   mount_opt;
  91         unsigned int    atime_quantum;
  92         signed short    slot;
  93         unsigned int    localalloc_opt;
  94         char            cluster_stack[OCFS2_STACK_LABEL_LEN + 1];
  95 };
  96
  97 static int ocfs2_parse_options(struct super_block *sb, char *options,
  98                                struct mount_options *mopt,
  99                                int is_remount);
 100 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt);
 101 static void ocfs2_put_super(struct super_block *sb);
 102 static int ocfs2_mount_volume(struct super_block *sb);
 103 static int ocfs2_remount(struct super_block *sb, int *flags, char *data);
 104 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err);
 105 static int ocfs2_initialize_mem_caches(void);
 106 static void ocfs2_free_mem_caches(void);
 107 static void ocfs2_delete_osb(struct ocfs2_super *osb);
 108
 109 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf);
 110
 111 static int ocfs2_sync_fs(struct super_block *sb, int wait);
 112
 113 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb);
 114 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb);
 115 static void ocfs2_release_system_inodes(struct ocfs2_super *osb);
 116 static int ocfs2_check_volume(struct ocfs2_super *osb);
 117 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
 118                                struct buffer_head *bh,
 119                                u32 sectsize);
 120 static int ocfs2_initialize_super(struct super_block *sb,
 121                                   struct buffer_head *bh,
 122                                   int sector_size);
 123 static int ocfs2_get_sector(struct super_block *sb,
 124                             struct buffer_head **bh,
 125                             int block,
 126                             int sect_size);
 127 static void ocfs2_write_super(struct super_block *sb);
 128 static struct inode *ocfs2_alloc_inode(struct super_block *sb);
 129 static void ocfs2_destroy_inode(struct inode *inode);
 130
 131 static const struct super_operations ocfs2_sops = {
 132         .statfs         = ocfs2_statfs,
 133         .alloc_inode    = ocfs2_alloc_inode,
 134         .destroy_inode  = ocfs2_destroy_inode,
 135         .drop_inode     = ocfs2_drop_inode,
 136         .clear_inode    = ocfs2_clear_inode,
 137         .delete_inode   = ocfs2_delete_inode,
 138         .sync_fs        = ocfs2_sync_fs,
 139         .write_super    = ocfs2_write_super,
 140         .put_super      = ocfs2_put_super,
 141         .remount_fs     = ocfs2_remount,
 142         .show_options   = ocfs2_show_options,
 143         .quota_read     = ocfs2_quota_read,
 144         .quota_write    = ocfs2_quota_write,
 145 };
 146
 147 enum {
 148         Opt_barrier,
 149         Opt_err_panic,
 150         Opt_err_ro,
 151         Opt_intr,
 152         Opt_nointr,
 153         Opt_hb_none,
 154         Opt_hb_local,
 155         Opt_data_ordered,
 156         Opt_data_writeback,
 157         Opt_atime_quantum,
 158         Opt_slot,
 159         Opt_commit,
 160         Opt_localalloc,
 161         Opt_localflocks,
 162         Opt_stack,
 163         Opt_user_xattr,
 164         Opt_nouser_xattr,
 165         Opt_inode64,
 166         Opt_acl,
 167         Opt_noacl,
 168         Opt_err,
 169 };
 170
 171 static const match_table_t tokens = {
 172         {Opt_barrier, "barrier=%u"},
 173         {Opt_err_panic, "errors=panic"},
 174         {Opt_err_ro, "errors=remount-ro"},
 175         {Opt_intr, "intr"},
 176         {Opt_nointr, "nointr"},
 177         {Opt_hb_none, OCFS2_HB_NONE},
 178         {Opt_hb_local, OCFS2_HB_LOCAL},
 179         {Opt_data_ordered, "data=ordered"},
 180         {Opt_data_writeback, "data=writeback"},
 181         {Opt_atime_quantum, "atime_quantum=%u"},
 182         {Opt_slot, "preferred_slot=%u"},
 183         {Opt_commit, "commit=%u"},
 184         {Opt_localalloc, "localalloc=%d"},
 185         {Opt_localflocks, "localflocks"},
 186         {Opt_stack, "cluster_stack=%s"},
 187         {Opt_user_xattr, "user_xattr"},
 188         {Opt_nouser_xattr, "nouser_xattr"},
 189         {Opt_inode64, "inode64"},
 190         {Opt_acl, "acl"},
 191         {Opt_noacl, "noacl"},
 192         {Opt_err, NULL}
 193 };
 194
 195 /*
 196  * write_super and sync_fs ripped right out of ext3.
 197  */
 198 static void ocfs2_write_super(struct super_block *sb)
 199 {
 200         if (mutex_trylock(&sb->s_lock) != 0)
 201                 BUG();
 202         sb->s_dirt = 0;
 203 }
 204
 205 static int ocfs2_sync_fs(struct super_block *sb, int wait)
 206 {
 207         int status;
 208         tid_t target;
 209         struct ocfs2_super *osb = OCFS2_SB(sb);
 210
 211         sb->s_dirt = 0;
 212
 213         if (ocfs2_is_hard_readonly(osb))
 214                 return -EROFS;
 215
 216         if (wait) {
 217                 status = ocfs2_flush_truncate_log(osb);
 218                 if (status < 0)
 219                         mlog_errno(status);
 220         } else {
 221                 ocfs2_schedule_truncate_log_flush(osb, 0);
 222         }
 223
 224         if (jbd2_journal_start_commit(OCFS2_SB(sb)->journal->j_journal,
 225                                       &target)) {
 226                 if (wait)
 227                         jbd2_log_wait_commit(OCFS2_SB(sb)->journal->j_journal,
 228                                              target);
 229         }
 230         return 0;
 231 }
 232
 233 static int ocfs2_need_system_inode(struct ocfs2_super *osb, int ino)
 234 {
 235         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_USRQUOTA)
 236             && (ino == USER_QUOTA_SYSTEM_INODE
 237                 || ino == LOCAL_USER_QUOTA_SYSTEM_INODE))
 238                 return 0;
 239         if (!OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)
 240             && (ino == GROUP_QUOTA_SYSTEM_INODE
 241                 || ino == LOCAL_GROUP_QUOTA_SYSTEM_INODE))
 242                 return 0;
 243         return 1;
 244 }
 245
 246 static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
 247 {
 248         struct inode *new = NULL;
 249         int status = 0;
 250         int i;
 251
 252         mlog_entry_void();
 253
 254         new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 255         if (IS_ERR(new)) {
 256                 status = PTR_ERR(new);
 257                 mlog_errno(status);
 258                 goto bail;
 259         }
 260         osb->root_inode = new;
 261
 262         new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
 263         if (IS_ERR(new)) {
 264                 status = PTR_ERR(new);
 265                 mlog_errno(status);
 266                 goto bail;
 267         }
 268         osb->sys_root_inode = new;
 269
 270         for (i = OCFS2_FIRST_ONLINE_SYSTEM_INODE;
 271              i <= OCFS2_LAST_GLOBAL_SYSTEM_INODE; i++) {
 272                 if (!ocfs2_need_system_inode(osb, i))
 273                         continue;
 274                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 275                 if (!new) {
 276                         ocfs2_release_system_inodes(osb);
 277                         status = -EINVAL;
 278                         mlog_errno(status);
 279                         /* FIXME: Should ERROR_RO_FS */
 280                         mlog(ML_ERROR, "Unable to load system inode %d, "
 281                              "possibly corrupt fs?", i);
 282                         goto bail;
 283                 }
 284                 // the array now has one ref, so drop this one
 285                 iput(new);
 286         }
 287
 288 bail:
 289         mlog_exit(status);
 290         return status;
 291 }
 292
 293 static int ocfs2_init_local_system_inodes(struct ocfs2_super *osb)
 294 {
 295         struct inode *new = NULL;
 296         int status = 0;
 297         int i;
 298
 299         mlog_entry_void();
 300
 301         for (i = OCFS2_LAST_GLOBAL_SYSTEM_INODE + 1;
 302              i < NUM_SYSTEM_INODES;
 303              i++) {
 304                 if (!ocfs2_need_system_inode(osb, i))
 305                         continue;
 306                 new = ocfs2_get_system_file_inode(osb, i, osb->slot_num);
 307                 if (!new) {
 308                         ocfs2_release_system_inodes(osb);
 309                         status = -EINVAL;
 310                         mlog(ML_ERROR, "status=%d, sysfile=%d, slot=%d\n",
 311                              status, i, osb->slot_num);
 312                         goto bail;
 313                 }
 314                 /* the array now has one ref, so drop this one */
 315                 iput(new);
 316         }
 317
 318 bail:
 319         mlog_exit(status);
 320         return status;
 321 }
 322
 323 static void ocfs2_release_system_inodes(struct ocfs2_super *osb)
 324 {
 325         int i;
 326         struct inode *inode;
 327
 328         mlog_entry_void();
 329
 330         for (i = 0; i < NUM_SYSTEM_INODES; i++) {
 331                 inode = osb->system_inodes[i];
 332                 if (inode) {
 333                         iput(inode);
 334                         osb->system_inodes[i] = NULL;
 335                 }
 336         }
 337
 338         inode = osb->sys_root_inode;
 339         if (inode) {
 340                 iput(inode);
 341                 osb->sys_root_inode = NULL;
 342         }
 343
 344         inode = osb->root_inode;
 345         if (inode) {
 346                 iput(inode);
 347                 osb->root_inode = NULL;
 348         }
 349
 350         mlog_exit(0);
 351 }
 352
 353 /* We're allocating fs objects, use GFP_NOFS */
 354 static struct inode *ocfs2_alloc_inode(struct super_block *sb)
 355 {
 356         struct ocfs2_inode_info *oi;
 357
 358         oi = kmem_cache_alloc(ocfs2_inode_cachep, GFP_NOFS);
 359         if (!oi)
 360                 return NULL;
 361
 362         jbd2_journal_init_jbd_inode(&oi->ip_jinode, &oi->vfs_inode);
 363         return &oi->vfs_inode;
 364 }
 365
 366 static void ocfs2_destroy_inode(struct inode *inode)
 367 {
 368         kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
 369 }
 370
 371 static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
 372                                                 unsigned int cbits)
 373 {
 374         unsigned int bytes = 1 << cbits;
 375         unsigned int trim = bytes;
 376         unsigned int bitshift = 32;
 377
 378         /*
 379          * i_size and all block offsets in ocfs2 are always 64 bits
 380          * wide. i_clusters is 32 bits, in cluster-sized units. So on
 381          * 64 bit platforms, cluster size will be the limiting factor.
 382          */
 383
 384 #if BITS_PER_LONG == 32
 385 # if defined(CONFIG_LBD)
 386         BUILD_BUG_ON(sizeof(sector_t) != 8);
 387         /*
 388          * We might be limited by page cache size.
 389          */
 390         if (bytes > PAGE_CACHE_SIZE) {
 391                 bytes = PAGE_CACHE_SIZE;
 392                 trim = 1;
 393                 /*
 394                  * Shift by 31 here so that we don't get larger than
 395                  * MAX_LFS_FILESIZE
 396                  */
 397                 bitshift = 31;
 398         }
 399 # else
 400         /*
 401          * We are limited by the size of sector_t. Use block size, as
 402          * that's what we expose to the VFS.
 403          */
 404         bytes = 1 << bbits;
 405         trim = 1;
 406         bitshift = 31;
 407 # endif
 408 #endif
 409
 410         /*
 411          * Trim by a whole cluster when we can actually approach the
 412          * on-disk limits. Otherwise we can overflow i_clusters when
 413          * an extent start is at the max offset.
 414          */
 415         return (((unsigned long long)bytes) << bitshift) - trim;
 416 }
 417
 418 static int ocfs2_remount(struct super_block *sb, int *flags, char *data)
 419 {
 420         int incompat_features;
 421         int ret = 0;
 422         struct mount_options parsed_options;
 423         struct ocfs2_super *osb = OCFS2_SB(sb);
 424
 425         if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) {
 426                 ret = -EINVAL;
 427                 goto out;
 428         }
 429
 430         if ((osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) !=
 431             (parsed_options.mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 432                 ret = -EINVAL;
 433                 mlog(ML_ERROR, "Cannot change heartbeat mode on remount\n");
 434                 goto out;
 435         }
 436
 437         if ((osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK) !=
 438             (parsed_options.mount_opt & OCFS2_MOUNT_DATA_WRITEBACK)) {
 439                 ret = -EINVAL;
 440                 mlog(ML_ERROR, "Cannot change data mode on remount\n");
 441                 goto out;
 442         }
 443
 444         /* Probably don't want this on remount; it might
 445          * mess with other nodes */
 446         if (!(osb->s_mount_opt & OCFS2_MOUNT_INODE64) &&
 447             (parsed_options.mount_opt & OCFS2_MOUNT_INODE64)) {
 448                 ret = -EINVAL;
 449                 mlog(ML_ERROR, "Cannot enable inode64 on remount\n");
 450                 goto out;
 451         }
 452
 453         /* We're going to/from readonly mode. */
 454         if ((*flags & MS_RDONLY) != (sb->s_flags & MS_RDONLY)) {
 455                 /* Lock here so the check of HARD_RO and the potential
 456                  * setting of SOFT_RO is atomic. */
 457                 spin_lock(&osb->osb_lock);
 458                 if (osb->osb_flags & OCFS2_OSB_HARD_RO) {
 459                         mlog(ML_ERROR, "Remount on readonly device is forbidden.\n");
 460                         ret = -EROFS;
 461                         goto unlock_osb;
 462                 }
 463
 464                 if (*flags & MS_RDONLY) {
 465                         mlog(0, "Going to ro mode.\n");
 466                         sb->s_flags |= MS_RDONLY;
 467                         osb->osb_flags |= OCFS2_OSB_SOFT_RO;
 468                 } else {
 469                         mlog(0, "Making ro filesystem writeable.\n");
 470
 471                         if (osb->osb_flags & OCFS2_OSB_ERROR_FS) {
 472                                 mlog(ML_ERROR, "Cannot remount RDWR "
 473                                      "filesystem due to previous errors.\n");
 474                                 ret = -EROFS;
 475                                 goto unlock_osb;
 476                         }
 477                         incompat_features = OCFS2_HAS_RO_COMPAT_FEATURE(sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP);
 478                         if (incompat_features) {
 479                                 mlog(ML_ERROR, "Cannot remount RDWR because "
 480                                      "of unsupported optional features "
 481                                      "(%x).\n", incompat_features);
 482                                 ret = -EINVAL;
 483                                 goto unlock_osb;
 484                         }
 485                         sb->s_flags &= ~MS_RDONLY;
 486                         osb->osb_flags &= ~OCFS2_OSB_SOFT_RO;
 487                 }
 488 unlock_osb:
 489                 spin_unlock(&osb->osb_lock);
 490         }
 491
 492         if (!ret) {
 493                 /* Only save off the new mount options in case of a successful
 494                  * remount. */
 495                 if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 496                         parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 497                 osb->s_mount_opt = parsed_options.mount_opt;
 498                 osb->s_atime_quantum = parsed_options.atime_quantum;
 499                 osb->preferred_slot = parsed_options.slot;
 500                 if (parsed_options.commit_interval)
 501                         osb->osb_commit_interval = parsed_options.commit_interval;
 502
 503                 if (!ocfs2_is_hard_readonly(osb))
 504                         ocfs2_set_journal_params(osb);
 505         }
 506 out:
 507         return ret;
 508 }
 509
 510 static int ocfs2_sb_probe(struct super_block *sb,
 511                           struct buffer_head **bh,
 512                           int *sector_size)
 513 {
 514         int status, tmpstat;
 515         struct ocfs1_vol_disk_hdr *hdr;
 516         struct ocfs2_dinode *di;
 517         int blksize;
 518
 519         *bh = NULL;
 520
 521         /* may be > 512 */
 522         *sector_size = bdev_hardsect_size(sb->s_bdev);
 523         if (*sector_size > OCFS2_MAX_BLOCKSIZE) {
 524                 mlog(ML_ERROR, "Hardware sector size too large: %d (max=%d)\n",
 525                      *sector_size, OCFS2_MAX_BLOCKSIZE);
 526                 status = -EINVAL;
 527                 goto bail;
 528         }
 529
 530         /* Can this really happen? */
 531         if (*sector_size < OCFS2_MIN_BLOCKSIZE)
 532                 *sector_size = OCFS2_MIN_BLOCKSIZE;
 533
 534         /* check block zero for old format */
 535         status = ocfs2_get_sector(sb, bh, 0, *sector_size);
 536         if (status < 0) {
 537                 mlog_errno(status);
 538                 goto bail;
 539         }
 540         hdr = (struct ocfs1_vol_disk_hdr *) (*bh)->b_data;
 541         if (hdr->major_version == OCFS1_MAJOR_VERSION) {
 542                 mlog(ML_ERROR, "incompatible version: %u.%u\n",
 543                      hdr->major_version, hdr->minor_version);
 544                 status = -EINVAL;
 545         }
 546         if (memcmp(hdr->signature, OCFS1_VOLUME_SIGNATURE,
 547                    strlen(OCFS1_VOLUME_SIGNATURE)) == 0) {
 548                 mlog(ML_ERROR, "incompatible volume signature: %8s\n",
 549                      hdr->signature);
 550                 status = -EINVAL;
 551         }
 552         brelse(*bh);
 553         *bh = NULL;
 554         if (status < 0) {
 555                 mlog(ML_ERROR, "This is an ocfs v1 filesystem which must be "
 556                      "upgraded before mounting with ocfs v2\n");
 557                 goto bail;
 558         }
 559
 560         /*
 561          * Now check at magic offset for 512, 1024, 2048, 4096
 562          * blocksizes.  4096 is the maximum blocksize because it is
 563          * the minimum clustersize.
 564          */
 565         status = -EINVAL;
 566         for (blksize = *sector_size;
 567              blksize <= OCFS2_MAX_BLOCKSIZE;
 568              blksize <<= 1) {
 569                 tmpstat = ocfs2_get_sector(sb, bh,
 570                                            OCFS2_SUPER_BLOCK_BLKNO,
 571                                            blksize);
 572                 if (tmpstat < 0) {
 573                         status = tmpstat;
 574                         mlog_errno(status);
 575                         goto bail;
 576                 }
 577                 di = (struct ocfs2_dinode *) (*bh)->b_data;
 578                 status = ocfs2_verify_volume(di, *bh, blksize);
 579                 if (status >= 0)
 580                         goto bail;
 581                 brelse(*bh);
 582                 *bh = NULL;
 583                 if (status != -EAGAIN)
 584                         break;
 585         }
 586
 587 bail:
 588         return status;
 589 }
 590
 591 static int ocfs2_verify_heartbeat(struct ocfs2_super *osb)
 592 {
 593         if (ocfs2_mount_local(osb)) {
 594                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 595                         mlog(ML_ERROR, "Cannot heartbeat on a locally "
 596                              "mounted device.\n");
 597                         return -EINVAL;
 598                 }
 599         }
 600
 601         if (ocfs2_userspace_stack(osb)) {
 602                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 603                         mlog(ML_ERROR, "Userspace stack expected, but "
 604                              "o2cb heartbeat arguments passed to mount\n");
 605                         return -EINVAL;
 606                 }
 607         }
 608
 609         if (!(osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL)) {
 610                 if (!ocfs2_mount_local(osb) && !ocfs2_is_hard_readonly(osb) &&
 611                     !ocfs2_userspace_stack(osb)) {
 612                         mlog(ML_ERROR, "Heartbeat has to be started to mount "
 613                              "a read-write clustered device.\n");
 614                         return -EINVAL;
 615                 }
 616         }
 617
 618         return 0;
 619 }
 620
 621 /*
 622  * If we're using a userspace stack, mount should have passed
 623  * a name that matches the disk.  If not, mount should not
 624  * have passed a stack.
 625  */
 626 static int ocfs2_verify_userspace_stack(struct ocfs2_super *osb,
 627                                         struct mount_options *mopt)
 628 {
 629         if (!ocfs2_userspace_stack(osb) && mopt->cluster_stack[0]) {
 630                 mlog(ML_ERROR,
 631                      "cluster stack passed to mount, but this filesystem "
 632                      "does not support it\n");
 633                 return -EINVAL;
 634         }
 635
 636         if (ocfs2_userspace_stack(osb) &&
 637             strncmp(osb->osb_cluster_stack, mopt->cluster_stack,
 638                     OCFS2_STACK_LABEL_LEN)) {
 639                 mlog(ML_ERROR,
 640                      "cluster stack passed to mount (\"%s\") does not "
 641                      "match the filesystem (\"%s\")\n",
 642                      mopt->cluster_stack,
 643                      osb->osb_cluster_stack);
 644                 return -EINVAL;
 645         }
 646
 647         return 0;
 648 }
 649
 650 static int ocfs2_fill_super(struct super_block *sb, void *data, int silent)
 651 {
 652         struct dentry *root;
 653         int status, sector_size;
 654         struct mount_options parsed_options;
 655         struct inode *inode = NULL;
 656         struct ocfs2_super *osb = NULL;
 657         struct buffer_head *bh = NULL;
 658         char nodestr[8];
 659
 660         mlog_entry("%p, %p, %i", sb, data, silent);
 661
 662         if (!ocfs2_parse_options(sb, data, &parsed_options, 0)) {
 663                 status = -EINVAL;
 664                 goto read_super_error;
 665         }
 666
 667         /* probe for superblock */
 668         status = ocfs2_sb_probe(sb, &bh, &sector_size);
 669         if (status < 0) {
 670                 mlog(ML_ERROR, "superblock probe failed!\n");
 671                 goto read_super_error;
 672         }
 673
 674         status = ocfs2_initialize_super(sb, bh, sector_size);
 675         osb = OCFS2_SB(sb);
 676         if (status < 0) {
 677                 mlog_errno(status);
 678                 goto read_super_error;
 679         }
 680         brelse(bh);
 681         bh = NULL;
 682
 683         if (!(osb->s_feature_incompat & OCFS2_FEATURE_INCOMPAT_XATTR))
 684                 parsed_options.mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 685
 686         osb->s_mount_opt = parsed_options.mount_opt;
 687         osb->s_atime_quantum = parsed_options.atime_quantum;
 688         osb->preferred_slot = parsed_options.slot;
 689         osb->osb_commit_interval = parsed_options.commit_interval;
 690         osb->local_alloc_default_bits = ocfs2_megabytes_to_clusters(sb, parsed_options.localalloc_opt);
 691         osb->local_alloc_bits = osb->local_alloc_default_bits;
 692
 693         status = ocfs2_verify_userspace_stack(osb, &parsed_options);
 694         if (status)
 695                 goto read_super_error;
 696
 697         sb->s_magic = OCFS2_SUPER_MAGIC;
 698
 699         sb->s_flags = (sb->s_flags & ~MS_POSIXACL) |
 700                 ((osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0);
 701
 702         /* Hard readonly mode only if: bdev_read_only, MS_RDONLY,
 703          * heartbeat=none */
 704         if (bdev_read_only(sb->s_bdev)) {
 705                 if (!(sb->s_flags & MS_RDONLY)) {
 706                         status = -EACCES;
 707                         mlog(ML_ERROR, "Readonly device detected but readonly "
 708                              "mount was not specified.\n");
 709                         goto read_super_error;
 710                 }
 711
 712                 /* You should not be able to start a local heartbeat
 713                  * on a readonly device. */
 714                 if (osb->s_mount_opt & OCFS2_MOUNT_HB_LOCAL) {
 715                         status = -EROFS;
 716                         mlog(ML_ERROR, "Local heartbeat specified on readonly "
 717                              "device.\n");
 718                         goto read_super_error;
 719                 }
 720
 721                 status = ocfs2_check_journals_nolocks(osb);
 722                 if (status < 0) {
 723                         if (status == -EROFS)
 724                                 mlog(ML_ERROR, "Recovery required on readonly "
 725                                      "file system, but write access is "
 726                                      "unavailable.\n");
 727                         else
 728                                 mlog_errno(status);
 729                         goto read_super_error;
 730                 }
 731
 732                 ocfs2_set_ro_flag(osb, 1);
 733
 734                 printk(KERN_NOTICE "Readonly device detected. No cluster "
 735                        "services will be utilized for this mount. Recovery "
 736                        "will be skipped.\n");
 737         }
 738
 739         if (!ocfs2_is_hard_readonly(osb)) {
 740                 if (sb->s_flags & MS_RDONLY)
 741                         ocfs2_set_ro_flag(osb, 0);
 742         }
 743
 744         status = ocfs2_verify_heartbeat(osb);
 745         if (status < 0) {
 746                 mlog_errno(status);
 747                 goto read_super_error;
 748         }
 749
 750         osb->osb_debug_root = debugfs_create_dir(osb->uuid_str,
 751                                                  ocfs2_debugfs_root);
 752         if (!osb->osb_debug_root) {
 753                 status = -EINVAL;
 754                 mlog(ML_ERROR, "Unable to create per-mount debugfs root.\n");
 755                 goto read_super_error;
 756         }
 757
 758         status = ocfs2_mount_volume(sb);
 759         if (osb->root_inode)
 760                 inode = igrab(osb->root_inode);
 761
 762         if (status < 0)
 763                 goto read_super_error;
 764
 765         if (!inode) {
 766                 status = -EIO;
 767                 mlog_errno(status);
 768                 goto read_super_error;
 769         }
 770
 771         root = d_alloc_root(inode);
 772         if (!root) {
 773                 status = -ENOMEM;
 774                 mlog_errno(status);
 775                 goto read_super_error;
 776         }
 777
 778         sb->s_root = root;
 779
 780         ocfs2_complete_mount_recovery(osb);
 781
 782         if (ocfs2_mount_local(osb))
 783                 snprintf(nodestr, sizeof(nodestr), "local");
 784         else
 785                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
 786
 787         printk(KERN_INFO "ocfs2: Mounting device (%s) on (node %s, slot %d) "
 788                "with %s data mode.\n",
 789                osb->dev_str, nodestr, osb->slot_num,
 790                osb->s_mount_opt & OCFS2_MOUNT_DATA_WRITEBACK ? "writeback" :
 791                "ordered");
 792
 793         atomic_set(&osb->vol_state, VOLUME_MOUNTED);
 794         wake_up(&osb->osb_mount_event);
 795
 796         mlog_exit(status);
 797         return status;
 798
 799 read_super_error:
 800         brelse(bh);
 801
 802         if (inode)
 803                 iput(inode);
 804
 805         if (osb) {
 806                 atomic_set(&osb->vol_state, VOLUME_DISABLED);
 807                 wake_up(&osb->osb_mount_event);
 808                 ocfs2_dismount_volume(sb, 1);
 809         }
 810
 811         mlog_exit(status);
 812         return status;
 813 }
 814
 815 static int ocfs2_get_sb(struct file_system_type *fs_type,
 816                         int flags,
 817                         const char *dev_name,
 818                         void *data,
 819                         struct vfsmount *mnt)
 820 {
 821         return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
 822                            mnt);
 823 }
 824
 825 static struct file_system_type ocfs2_fs_type = {
 826         .owner          = THIS_MODULE,
 827         .name           = "ocfs2",
 828         .get_sb         = ocfs2_get_sb, /* is this called when we mount
 829                                         * the fs? */
 830         .kill_sb        = kill_block_super, /* set to the generic one
 831                                              * right now, but do we
 832                                              * need to change that? */
 833         .fs_flags       = FS_REQUIRES_DEV|FS_RENAME_DOES_D_MOVE,
 834         .next           = NULL
 835 };
 836
 837 static int ocfs2_parse_options(struct super_block *sb,
 838                                char *options,
 839                                struct mount_options *mopt,
 840                                int is_remount)
 841 {
 842         int status;
 843         char *p;
 844
 845         mlog_entry("remount: %d, options: \"%s\"\n", is_remount,
 846                    options ? options : "(none)");
 847
 848         mopt->commit_interval = 0;
 849         mopt->mount_opt = 0;
 850         mopt->atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
 851         mopt->slot = OCFS2_INVALID_SLOT;
 852         mopt->localalloc_opt = OCFS2_DEFAULT_LOCAL_ALLOC_SIZE;
 853         mopt->cluster_stack[0] = '\0';
 854
 855         if (!options) {
 856                 status = 1;
 857                 goto bail;
 858         }
 859
 860         while ((p = strsep(&options, ",")) != NULL) {
 861                 int token, option;
 862                 substring_t args[MAX_OPT_ARGS];
 863
 864                 if (!*p)
 865                         continue;
 866
 867                 token = match_token(p, tokens, args);
 868                 switch (token) {
 869                 case Opt_hb_local:
 870                         mopt->mount_opt |= OCFS2_MOUNT_HB_LOCAL;
 871                         break;
 872                 case Opt_hb_none:
 873                         mopt->mount_opt &= ~OCFS2_MOUNT_HB_LOCAL;
 874                         break;
 875                 case Opt_barrier:
 876                         if (match_int(&args[0], &option)) {
 877                                 status = 0;
 878                                 goto bail;
 879                         }
 880                         if (option)
 881                                 mopt->mount_opt |= OCFS2_MOUNT_BARRIER;
 882                         else
 883                                 mopt->mount_opt &= ~OCFS2_MOUNT_BARRIER;
 884                         break;
 885                 case Opt_intr:
 886                         mopt->mount_opt &= ~OCFS2_MOUNT_NOINTR;
 887                         break;
 888                 case Opt_nointr:
 889                         mopt->mount_opt |= OCFS2_MOUNT_NOINTR;
 890                         break;
 891                 case Opt_err_panic:
 892                         mopt->mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
 893                         break;
 894                 case Opt_err_ro:
 895                         mopt->mount_opt &= ~OCFS2_MOUNT_ERRORS_PANIC;
 896                         break;
 897                 case Opt_data_ordered:
 898                         mopt->mount_opt &= ~OCFS2_MOUNT_DATA_WRITEBACK;
 899                         break;
 900                 case Opt_data_writeback:
 901                         mopt->mount_opt |= OCFS2_MOUNT_DATA_WRITEBACK;
 902                         break;
 903                 case Opt_user_xattr:
 904                         mopt->mount_opt &= ~OCFS2_MOUNT_NOUSERXATTR;
 905                         break;
 906                 case Opt_nouser_xattr:
 907                         mopt->mount_opt |= OCFS2_MOUNT_NOUSERXATTR;
 908                         break;
 909                 case Opt_atime_quantum:
 910                         if (match_int(&args[0], &option)) {
 911                                 status = 0;
 912                                 goto bail;
 913                         }
 914                         if (option >= 0)
 915                                 mopt->atime_quantum = option;
 916                         break;
 917                 case Opt_slot:
 918                         option = 0;
 919                         if (match_int(&args[0], &option)) {
 920                                 status = 0;
 921                                 goto bail;
 922                         }
 923                         if (option)
 924                                 mopt->slot = (s16)option;
 925                         break;
 926                 case Opt_commit:
 927                         option = 0;
 928                         if (match_int(&args[0], &option)) {
 929                                 status = 0;
 930                                 goto bail;
 931                         }
 932                         if (option < 0)
 933                                 return 0;
 934                         if (option == 0)
 935                                 option = JBD2_DEFAULT_MAX_COMMIT_AGE;
 936                         mopt->commit_interval = HZ * option;
 937                         break;
 938                 case Opt_localalloc:
 939                         option = 0;
 940                         if (match_int(&args[0], &option)) {
 941                                 status = 0;
 942                                 goto bail;
 943                         }
 944                         if (option >= 0 && (option <= ocfs2_local_alloc_size(sb) * 8))
 945                                 mopt->localalloc_opt = option;
 946                         break;
 947                 case Opt_localflocks:
 948                         /*
 949                          * Changing this during remount could race
 950                          * flock() requests, or "unbalance" existing
 951                          * ones (e.g., a lock is taken in one mode but
 952                          * dropped in the other). If users care enough
 953                          * to flip locking modes during remount, we
 954                          * could add a "local" flag to individual
 955                          * flock structures for proper tracking of
 956                          * state.
 957                          */
 958                         if (!is_remount)
 959                                 mopt->mount_opt |= OCFS2_MOUNT_LOCALFLOCKS;
 960                         break;
 961                 case Opt_stack:
 962                         /* Check both that the option we were passed
 963                          * is of the right length and that it is a proper
 964                          * string of the right length.
 965                          */
 966                         if (((args[0].to - args[0].from) !=
 967                              OCFS2_STACK_LABEL_LEN) ||
 968                             (strnlen(args[0].from,
 969                                      OCFS2_STACK_LABEL_LEN) !=
 970                              OCFS2_STACK_LABEL_LEN)) {
 971                                 mlog(ML_ERROR,
 972                                      "Invalid cluster_stack option\n");
 973                                 status = 0;
 974                                 goto bail;
 975                         }
 976                         memcpy(mopt->cluster_stack, args[0].from,
 977                                OCFS2_STACK_LABEL_LEN);
 978                         mopt->cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
 979                         break;
 980                 case Opt_inode64:
 981                         mopt->mount_opt |= OCFS2_MOUNT_INODE64;
 982                         break;
 983 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
 984                 case Opt_acl:
 985                         mopt->mount_opt |= OCFS2_MOUNT_POSIX_ACL;
 986                         break;
 987                 case Opt_noacl:
 988                         mopt->mount_opt &= ~OCFS2_MOUNT_POSIX_ACL;
 989                         break;
 990 #else
 991                 case Opt_acl:
 992                 case Opt_noacl:
 993                         printk(KERN_INFO "ocfs2 (no)acl options not supported\n");
 994                         break;
 995 #endif
 996                 default:
 997                         mlog(ML_ERROR,
 998                              "Unrecognized mount option \"%s\" "
 999                              "or missing value\n", p);
1000                         status = 0;
1001                         goto bail;
1002                 }
1003         }
1004
1005         status = 1;
1006
1007 bail:
1008         mlog_exit(status);
1009         return status;
1010 }
1011
1012 static int ocfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
1013 {
1014         struct ocfs2_super *osb = OCFS2_SB(mnt->mnt_sb);
1015         unsigned long opts = osb->s_mount_opt;
1016         unsigned int local_alloc_megs;
1017
1018         if (opts & OCFS2_MOUNT_HB_LOCAL)
1019                 seq_printf(s, ",_netdev,heartbeat=local");
1020         else
1021                 seq_printf(s, ",heartbeat=none");
1022
1023         if (opts & OCFS2_MOUNT_NOINTR)
1024                 seq_printf(s, ",nointr");
1025
1026         if (opts & OCFS2_MOUNT_DATA_WRITEBACK)
1027                 seq_printf(s, ",data=writeback");
1028         else
1029                 seq_printf(s, ",data=ordered");
1030
1031         if (opts & OCFS2_MOUNT_BARRIER)
1032                 seq_printf(s, ",barrier=1");
1033
1034         if (opts & OCFS2_MOUNT_ERRORS_PANIC)
1035                 seq_printf(s, ",errors=panic");
1036         else
1037                 seq_printf(s, ",errors=remount-ro");
1038
1039         if (osb->preferred_slot != OCFS2_INVALID_SLOT)
1040                 seq_printf(s, ",preferred_slot=%d", osb->preferred_slot);
1041
1042         if (osb->s_atime_quantum != OCFS2_DEFAULT_ATIME_QUANTUM)
1043                 seq_printf(s, ",atime_quantum=%u", osb->s_atime_quantum);
1044
1045         if (osb->osb_commit_interval)
1046                 seq_printf(s, ",commit=%u",
1047                            (unsigned) (osb->osb_commit_interval / HZ));
1048
1049         local_alloc_megs = osb->local_alloc_bits >> (20 - osb->s_clustersize_bits);
1050         if (local_alloc_megs != OCFS2_DEFAULT_LOCAL_ALLOC_SIZE)
1051                 seq_printf(s, ",localalloc=%d", local_alloc_megs);
1052
1053         if (opts & OCFS2_MOUNT_LOCALFLOCKS)
1054                 seq_printf(s, ",localflocks,");
1055
1056         if (osb->osb_cluster_stack[0])
1057                 seq_printf(s, ",cluster_stack=%.*s", OCFS2_STACK_LABEL_LEN,
1058                            osb->osb_cluster_stack);
1059
1060         if (opts & OCFS2_MOUNT_NOUSERXATTR)
1061                 seq_printf(s, ",nouser_xattr");
1062         else
1063                 seq_printf(s, ",user_xattr");
1064
1065         if (opts & OCFS2_MOUNT_INODE64)
1066                 seq_printf(s, ",inode64");
1067
1068 #ifdef CONFIG_OCFS2_FS_POSIX_ACL
1069         if (opts & OCFS2_MOUNT_POSIX_ACL)
1070                 seq_printf(s, ",acl");
1071         else
1072                 seq_printf(s, ",noacl");
1073 #endif
1074
1075         return 0;
1076 }
1077
1078 static int __init ocfs2_init(void)
1079 {
1080         int status;
1081
1082         mlog_entry_void();
1083
1084         ocfs2_print_version();
1085
1086         status = init_ocfs2_uptodate_cache();
1087         if (status < 0) {
1088                 mlog_errno(status);
1089                 goto leave;
1090         }
1091
1092         status = ocfs2_initialize_mem_caches();
1093         if (status < 0) {
1094                 mlog_errno(status);
1095                 goto leave;
1096         }
1097
1098         ocfs2_wq = create_singlethread_workqueue("ocfs2_wq");
1099         if (!ocfs2_wq) {
1100                 status = -ENOMEM;
1101                 goto leave;
1102         }
1103
1104         ocfs2_debugfs_root = debugfs_create_dir("ocfs2", NULL);
1105         if (!ocfs2_debugfs_root) {
1106                 status = -EFAULT;
1107                 mlog(ML_ERROR, "Unable to create ocfs2 debugfs root.\n");
1108         }
1109
1110         status = ocfs2_quota_setup();
1111         if (status)
1112                 goto leave;
1113
1114         ocfs2_set_locking_protocol();
1115
1116         status = register_quota_format(&ocfs2_quota_format);
1117 leave:
1118         if (status < 0) {
1119                 ocfs2_quota_shutdown();
1120                 ocfs2_free_mem_caches();
1121                 exit_ocfs2_uptodate_cache();
1122         }
1123
1124         mlog_exit(status);
1125
1126         if (status >= 0) {
1127                 return register_filesystem(&ocfs2_fs_type);
1128         } else
1129                 return -1;
1130 }
1131
1132 static void __exit ocfs2_exit(void)
1133 {
1134         mlog_entry_void();
1135
1136         ocfs2_quota_shutdown();
1137
1138         if (ocfs2_wq) {
1139                 flush_workqueue(ocfs2_wq);
1140                 destroy_workqueue(ocfs2_wq);
1141         }
1142
1143         unregister_quota_format(&ocfs2_quota_format);
1144
1145         debugfs_remove(ocfs2_debugfs_root);
1146
1147         ocfs2_free_mem_caches();
1148
1149         unregister_filesystem(&ocfs2_fs_type);
1150
1151         exit_ocfs2_uptodate_cache();
1152
1153         mlog_exit_void();
1154 }
1155
1156 static void ocfs2_put_super(struct super_block *sb)
1157 {
1158         mlog_entry("(0x%p)\n", sb);
1159
1160         ocfs2_sync_blockdev(sb);
1161         ocfs2_dismount_volume(sb, 0);
1162
1163         mlog_exit_void();
1164 }
1165
1166 static int ocfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
1167 {
1168         struct ocfs2_super *osb;
1169         u32 numbits, freebits;
1170         int status;
1171         struct ocfs2_dinode *bm_lock;
1172         struct buffer_head *bh = NULL;
1173         struct inode *inode = NULL;
1174
1175         mlog_entry("(%p, %p)\n", dentry->d_sb, buf);
1176
1177         osb = OCFS2_SB(dentry->d_sb);
1178
1179         inode = ocfs2_get_system_file_inode(osb,
1180                                             GLOBAL_BITMAP_SYSTEM_INODE,
1181                                             OCFS2_INVALID_SLOT);
1182         if (!inode) {
1183                 mlog(ML_ERROR, "failed to get bitmap inode\n");
1184                 status = -EIO;
1185                 goto bail;
1186         }
1187
1188         status = ocfs2_inode_lock(inode, &bh, 0);
1189         if (status < 0) {
1190                 mlog_errno(status);
1191                 goto bail;
1192         }
1193
1194         bm_lock = (struct ocfs2_dinode *) bh->b_data;
1195
1196         numbits = le32_to_cpu(bm_lock->id1.bitmap1.i_total);
1197         freebits = numbits - le32_to_cpu(bm_lock->id1.bitmap1.i_used);
1198
1199         buf->f_type = OCFS2_SUPER_MAGIC;
1200         buf->f_bsize = dentry->d_sb->s_blocksize;
1201         buf->f_namelen = OCFS2_MAX_FILENAME_LEN;
1202         buf->f_blocks = ((sector_t) numbits) *
1203                         (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1204         buf->f_bfree = ((sector_t) freebits) *
1205                        (osb->s_clustersize >> osb->sb->s_blocksize_bits);
1206         buf->f_bavail = buf->f_bfree;
1207         buf->f_files = numbits;
1208         buf->f_ffree = freebits;
1209
1210         brelse(bh);
1211
1212         ocfs2_inode_unlock(inode, 0);
1213         status = 0;
1214 bail:
1215         if (inode)
1216                 iput(inode);
1217
1218         mlog_exit(status);
1219
1220         return status;
1221 }
1222
1223 static void ocfs2_inode_init_once(void *data)
1224 {
1225         struct ocfs2_inode_info *oi = data;
1226
1227         oi->ip_flags = 0;
1228         oi->ip_open_count = 0;
1229         spin_lock_init(&oi->ip_lock);
1230         ocfs2_extent_map_init(&oi->vfs_inode);
1231         INIT_LIST_HEAD(&oi->ip_io_markers);
1232         oi->ip_created_trans = 0;
1233         oi->ip_last_trans = 0;
1234         oi->ip_dir_start_lookup = 0;
1235
1236         init_rwsem(&oi->ip_alloc_sem);
1237         init_rwsem(&oi->ip_xattr_sem);
1238         mutex_init(&oi->ip_io_mutex);
1239
1240         oi->ip_blkno = 0ULL;
1241         oi->ip_clusters = 0;
1242
1243         ocfs2_lock_res_init_once(&oi->ip_rw_lockres);
1244         ocfs2_lock_res_init_once(&oi->ip_inode_lockres);
1245         ocfs2_lock_res_init_once(&oi->ip_open_lockres);
1246
1247         ocfs2_metadata_cache_init(&oi->vfs_inode);
1248
1249         inode_init_once(&oi->vfs_inode);
1250 }
1251
1252 static int ocfs2_initialize_mem_caches(void)
1253 {
1254         ocfs2_inode_cachep = kmem_cache_create("ocfs2_inode_cache",
1255                                        sizeof(struct ocfs2_inode_info),
1256                                        0,
1257                                        (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1258                                                 SLAB_MEM_SPREAD),
1259                                        ocfs2_inode_init_once);
1260         ocfs2_dquot_cachep = kmem_cache_create("ocfs2_dquot_cache",
1261                                         sizeof(struct ocfs2_dquot),
1262                                         0,
1263                                         (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
1264                                                 SLAB_MEM_SPREAD),
1265                                         NULL);
1266         ocfs2_qf_chunk_cachep = kmem_cache_create("ocfs2_qf_chunk_cache",
1267                                         sizeof(struct ocfs2_quota_chunk),
1268                                         0,
1269                                         (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD),
1270                                         NULL);
1271         if (!ocfs2_inode_cachep || !ocfs2_dquot_cachep ||
1272             !ocfs2_qf_chunk_cachep) {
1273                 if (ocfs2_inode_cachep)
1274                         kmem_cache_destroy(ocfs2_inode_cachep);
1275                 if (ocfs2_dquot_cachep)
1276                         kmem_cache_destroy(ocfs2_dquot_cachep);
1277                 if (ocfs2_qf_chunk_cachep)
1278                         kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1279                 return -ENOMEM;
1280         }
1281
1282         return 0;
1283 }
1284
1285 static void ocfs2_free_mem_caches(void)
1286 {
1287         if (ocfs2_inode_cachep)
1288                 kmem_cache_destroy(ocfs2_inode_cachep);
1289         ocfs2_inode_cachep = NULL;
1290
1291         if (ocfs2_dquot_cachep)
1292                 kmem_cache_destroy(ocfs2_dquot_cachep);
1293         ocfs2_dquot_cachep = NULL;
1294
1295         if (ocfs2_qf_chunk_cachep)
1296                 kmem_cache_destroy(ocfs2_qf_chunk_cachep);
1297         ocfs2_qf_chunk_cachep = NULL;
1298 }
1299
1300 static int ocfs2_get_sector(struct super_block *sb,
1301                             struct buffer_head **bh,
1302                             int block,
1303                             int sect_size)
1304 {
1305         if (!sb_set_blocksize(sb, sect_size)) {
1306                 mlog(ML_ERROR, "unable to set blocksize\n");
1307                 return -EIO;
1308         }
1309
1310         *bh = sb_getblk(sb, block);
1311         if (!*bh) {
1312                 mlog_errno(-EIO);
1313                 return -EIO;
1314         }
1315         lock_buffer(*bh);
1316         if (!buffer_dirty(*bh))
1317                 clear_buffer_uptodate(*bh);
1318         unlock_buffer(*bh);
1319         ll_rw_block(READ, 1, bh);
1320         wait_on_buffer(*bh);
1321         return 0;
1322 }
1323
1324 static int ocfs2_mount_volume(struct super_block *sb)
1325 {
1326         int status = 0;
1327         int unlock_super = 0;
1328         struct ocfs2_super *osb = OCFS2_SB(sb);
1329
1330         mlog_entry_void();
1331
1332         if (ocfs2_is_hard_readonly(osb))
1333                 goto leave;
1334
1335         status = ocfs2_dlm_init(osb);
1336         if (status < 0) {
1337                 mlog_errno(status);
1338                 goto leave;
1339         }
1340
1341         status = ocfs2_super_lock(osb, 1);
1342         if (status < 0) {
1343                 mlog_errno(status);
1344                 goto leave;
1345         }
1346         unlock_super = 1;
1347
1348         /* This will load up the node map and add ourselves to it. */
1349         status = ocfs2_find_slot(osb);
1350         if (status < 0) {
1351                 mlog_errno(status);
1352                 goto leave;
1353         }
1354
1355         /* load all node-local system inodes */
1356         status = ocfs2_init_local_system_inodes(osb);
1357         if (status < 0) {
1358                 mlog_errno(status);
1359                 goto leave;
1360         }
1361
1362         status = ocfs2_check_volume(osb);
1363         if (status < 0) {
1364                 mlog_errno(status);
1365                 goto leave;
1366         }
1367
1368         status = ocfs2_truncate_log_init(osb);
1369         if (status < 0) {
1370                 mlog_errno(status);
1371                 goto leave;
1372         }
1373
1374         if (ocfs2_mount_local(osb))
1375                 goto leave;
1376
1377 leave:
1378         if (unlock_super)
1379                 ocfs2_super_unlock(osb, 1);
1380
1381         mlog_exit(status);
1382         return status;
1383 }
1384
1385 static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
1386 {
1387         int tmp, hangup_needed = 0;
1388         struct ocfs2_super *osb = NULL;
1389         char nodestr[8];
1390
1391         mlog_entry("(0x%p)\n", sb);
1392
1393         BUG_ON(!sb);
1394         osb = OCFS2_SB(sb);
1395         BUG_ON(!osb);
1396
1397         ocfs2_shutdown_local_alloc(osb);
1398
1399         ocfs2_truncate_log_shutdown(osb);
1400
1401         /* This will disable recovery and flush any recovery work. */
1402         ocfs2_recovery_exit(osb);
1403
1404         ocfs2_journal_shutdown(osb);
1405
1406         ocfs2_sync_blockdev(sb);
1407
1408         /* No cluster connection means we've failed during mount, so skip
1409          * all the steps which depended on that to complete. */
1410         if (osb->cconn) {
1411                 tmp = ocfs2_super_lock(osb, 1);
1412                 if (tmp < 0) {
1413                         mlog_errno(tmp);
1414                         return;
1415                 }
1416         }
1417
1418         if (osb->slot_num != OCFS2_INVALID_SLOT)
1419                 ocfs2_put_slot(osb);
1420
1421         if (osb->cconn)
1422                 ocfs2_super_unlock(osb, 1);
1423
1424         ocfs2_release_system_inodes(osb);
1425
1426         /*
1427          * If we're dismounting due to mount error, mount.ocfs2 will clean
1428          * up heartbeat.  If we're a local mount, there is no heartbeat.
1429          * If we failed before we got a uuid_str yet, we can't stop
1430          * heartbeat.  Otherwise, do it.
1431          */
1432         if (!mnt_err && !ocfs2_mount_local(osb) && osb->uuid_str)
1433                 hangup_needed = 1;
1434
1435         if (osb->cconn)
1436                 ocfs2_dlm_shutdown(osb, hangup_needed);
1437
1438         debugfs_remove(osb->osb_debug_root);
1439
1440         if (hangup_needed)
1441                 ocfs2_cluster_hangup(osb->uuid_str, strlen(osb->uuid_str));
1442
1443         atomic_set(&osb->vol_state, VOLUME_DISMOUNTED);
1444
1445         if (ocfs2_mount_local(osb))
1446                 snprintf(nodestr, sizeof(nodestr), "local");
1447         else
1448                 snprintf(nodestr, sizeof(nodestr), "%u", osb->node_num);
1449
1450         printk(KERN_INFO "ocfs2: Unmounting device (%s) on (node %s)\n",
1451                osb->dev_str, nodestr);
1452
1453         ocfs2_delete_osb(osb);
1454         kfree(osb);
1455         sb->s_dev = 0;
1456         sb->s_fs_info = NULL;
1457 }
1458
1459 static int ocfs2_setup_osb_uuid(struct ocfs2_super *osb, const unsigned char *uuid,
1460                                 unsigned uuid_bytes)
1461 {
1462         int i, ret;
1463         char *ptr;
1464
1465         BUG_ON(uuid_bytes != OCFS2_VOL_UUID_LEN);
1466
1467         osb->uuid_str = kzalloc(OCFS2_VOL_UUID_LEN * 2 + 1, GFP_KERNEL);
1468         if (osb->uuid_str == NULL)
1469                 return -ENOMEM;
1470
1471         for (i = 0, ptr = osb->uuid_str; i < OCFS2_VOL_UUID_LEN; i++) {
1472                 /* print with null */
1473                 ret = snprintf(ptr, 3, "%02X", uuid[i]);
1474                 if (ret != 2) /* drop super cleans up */
1475                         return -EINVAL;
1476                 /* then only advance past the last char */
1477                 ptr += 2;
1478         }
1479
1480         return 0;
1481 }
1482
1483 static int ocfs2_initialize_super(struct super_block *sb,
1484                                   struct buffer_head *bh,
1485                                   int sector_size)
1486 {
1487         int status;
1488         int i, cbits, bbits;
1489         struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1490         struct inode *inode = NULL;
1491         struct ocfs2_journal *journal;
1492         __le32 uuid_net_key;
1493         struct ocfs2_super *osb;
1494
1495         mlog_entry_void();
1496
1497         osb = kzalloc(sizeof(struct ocfs2_super), GFP_KERNEL);
1498         if (!osb) {
1499                 status = -ENOMEM;
1500                 mlog_errno(status);
1501                 goto bail;
1502         }
1503
1504         sb->s_fs_info = osb;
1505         sb->s_op = &ocfs2_sops;
1506         sb->s_export_op = &ocfs2_export_ops;
1507         sb->s_xattr = ocfs2_xattr_handlers;
1508         sb->s_time_gran = 1;
1509         sb->s_flags |= MS_NOATIME;
1510         /* this is needed to support O_LARGEFILE */
1511         cbits = le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1512         bbits = le32_to_cpu(di->id2.i_super.s_blocksize_bits);
1513         sb->s_maxbytes = ocfs2_max_file_offset(bbits, cbits);
1514
1515         osb->sb = sb;
1516         /* Save off for ocfs2_rw_direct */
1517         osb->s_sectsize_bits = blksize_bits(sector_size);
1518         BUG_ON(!osb->s_sectsize_bits);
1519
1520         spin_lock_init(&osb->dc_task_lock);
1521         init_waitqueue_head(&osb->dc_event);
1522         osb->dc_work_sequence = 0;
1523         osb->dc_wake_sequence = 0;
1524         INIT_LIST_HEAD(&osb->blocked_lock_list);
1525         osb->blocked_lock_count = 0;
1526         spin_lock_init(&osb->osb_lock);
1527         ocfs2_init_inode_steal_slot(osb);
1528
1529         atomic_set(&osb->alloc_stats.moves, 0);
1530         atomic_set(&osb->alloc_stats.local_data, 0);
1531         atomic_set(&osb->alloc_stats.bitmap_data, 0);
1532         atomic_set(&osb->alloc_stats.bg_allocs, 0);
1533         atomic_set(&osb->alloc_stats.bg_extends, 0);
1534
1535         ocfs2_init_node_maps(osb);
1536
1537         snprintf(osb->dev_str, sizeof(osb->dev_str), "%u,%u",
1538                  MAJOR(osb->sb->s_dev), MINOR(osb->sb->s_dev));
1539
1540         status = ocfs2_recovery_init(osb);
1541         if (status) {
1542                 mlog(ML_ERROR, "Unable to initialize recovery state\n");
1543                 mlog_errno(status);
1544                 goto bail;
1545         }
1546
1547         init_waitqueue_head(&osb->checkpoint_event);
1548         atomic_set(&osb->needs_checkpoint, 0);
1549
1550         osb->s_atime_quantum = OCFS2_DEFAULT_ATIME_QUANTUM;
1551
1552         osb->slot_num = OCFS2_INVALID_SLOT;
1553
1554         osb->s_xattr_inline_size = le16_to_cpu(
1555                                         di->id2.i_super.s_xattr_inline_size);
1556
1557         osb->local_alloc_state = OCFS2_LA_UNUSED;
1558         osb->local_alloc_bh = NULL;
1559         INIT_DELAYED_WORK(&osb->la_enable_wq, ocfs2_la_enable_worker);
1560
1561         init_waitqueue_head(&osb->osb_mount_event);
1562
1563         osb->vol_label = kmalloc(OCFS2_MAX_VOL_LABEL_LEN, GFP_KERNEL);
1564         if (!osb->vol_label) {
1565                 mlog(ML_ERROR, "unable to alloc vol label\n");
1566                 status = -ENOMEM;
1567                 goto bail;
1568         }
1569
1570         osb->max_slots = le16_to_cpu(di->id2.i_super.s_max_slots);
1571         if (osb->max_slots > OCFS2_MAX_SLOTS || osb->max_slots == 0) {
1572                 mlog(ML_ERROR, "Invalid number of node slots (%u)\n",
1573                      osb->max_slots);
1574                 status = -EINVAL;
1575                 goto bail;
1576         }
1577         mlog(0, "max_slots for this device: %u\n", osb->max_slots);
1578
1579         osb->slot_recovery_generations =
1580                 kcalloc(osb->max_slots, sizeof(*osb->slot_recovery_generations),
1581                         GFP_KERNEL);
1582         if (!osb->slot_recovery_generations) {
1583                 status = -ENOMEM;
1584                 mlog_errno(status);
1585                 goto bail;
1586         }
1587
1588         init_waitqueue_head(&osb->osb_wipe_event);
1589         osb->osb_orphan_wipes = kcalloc(osb->max_slots,
1590                                         sizeof(*osb->osb_orphan_wipes),
1591                                         GFP_KERNEL);
1592         if (!osb->osb_orphan_wipes) {
1593                 status = -ENOMEM;
1594                 mlog_errno(status);
1595                 goto bail;
1596         }
1597
1598         osb->s_feature_compat =
1599                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_compat);
1600         osb->s_feature_ro_compat =
1601                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_ro_compat);
1602         osb->s_feature_incompat =
1603                 le32_to_cpu(OCFS2_RAW_SB(di)->s_feature_incompat);
1604
1605         if ((i = OCFS2_HAS_INCOMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_INCOMPAT_SUPP))) {
1606                 mlog(ML_ERROR, "couldn't mount because of unsupported "
1607                      "optional features (%x).\n", i);
1608                 status = -EINVAL;
1609                 goto bail;
1610         }
1611         if (!(osb->sb->s_flags & MS_RDONLY) &&
1612             (i = OCFS2_HAS_RO_COMPAT_FEATURE(osb->sb, ~OCFS2_FEATURE_RO_COMPAT_SUPP))) {
1613                 mlog(ML_ERROR, "couldn't mount RDWR because of "
1614                      "unsupported optional features (%x).\n", i);
1615                 status = -EINVAL;
1616                 goto bail;
1617         }
1618
1619         if (ocfs2_userspace_stack(osb)) {
1620                 memcpy(osb->osb_cluster_stack,
1621                        OCFS2_RAW_SB(di)->s_cluster_info.ci_stack,
1622                        OCFS2_STACK_LABEL_LEN);
1623                 osb->osb_cluster_stack[OCFS2_STACK_LABEL_LEN] = '\0';
1624                 if (strlen(osb->osb_cluster_stack) != OCFS2_STACK_LABEL_LEN) {
1625                         mlog(ML_ERROR,
1626                              "couldn't mount because of an invalid "
1627                              "cluster stack label (%s) \n",
1628                              osb->osb_cluster_stack);
1629                         status = -EINVAL;
1630                         goto bail;
1631                 }
1632         } else {
1633                 /* The empty string is identical with classic tools that
1634                  * don't know about s_cluster_info. */
1635                 osb->osb_cluster_stack[0] = '\0';
1636         }
1637
1638         get_random_bytes(&osb->s_next_generation, sizeof(u32));
1639
1640         /* FIXME
1641          * This should be done in ocfs2_journal_init(), but unknown
1642          * ordering issues will cause the filesystem to crash.
1643          * If anyone wants to figure out what part of the code
1644          * refers to osb->journal before ocfs2_journal_init() is run,
1645          * be my guest.
1646          */
1647         /* initialize our journal structure */
1648
1649         journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
1650         if (!journal) {
1651                 mlog(ML_ERROR, "unable to alloc journal\n");
1652                 status = -ENOMEM;
1653                 goto bail;
1654         }
1655         osb->journal = journal;
1656         journal->j_osb = osb;
1657
1658         atomic_set(&journal->j_num_trans, 0);
1659         init_rwsem(&journal->j_trans_barrier);
1660         init_waitqueue_head(&journal->j_checkpointed);
1661         spin_lock_init(&journal->j_lock);
1662         journal->j_trans_id = (unsigned long) 1;
1663         INIT_LIST_HEAD(&journal->j_la_cleanups);
1664         INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
1665         journal->j_state = OCFS2_JOURNAL_FREE;
1666
1667         /* get some pseudo constants for clustersize bits */
1668         osb->s_clustersize_bits =
1669                 le32_to_cpu(di->id2.i_super.s_clustersize_bits);
1670         osb->s_clustersize = 1 << osb->s_clustersize_bits;
1671         mlog(0, "clusterbits=%d\n", osb->s_clustersize_bits);
1672
1673         if (osb->s_clustersize < OCFS2_MIN_CLUSTERSIZE ||
1674             osb->s_clustersize > OCFS2_MAX_CLUSTERSIZE) {
1675                 mlog(ML_ERROR, "Volume has invalid cluster size (%d)\n",
1676                      osb->s_clustersize);
1677                 status = -EINVAL;
1678                 goto bail;
1679         }
1680
1681         if (ocfs2_clusters_to_blocks(osb->sb, le32_to_cpu(di->i_clusters) - 1)
1682             > (u32)~0UL) {
1683                 mlog(ML_ERROR, "Volume might try to write to blocks beyond "
1684                      "what jbd can address in 32 bits.\n");
1685                 status = -EINVAL;
1686                 goto bail;
1687         }
1688
1689         if (ocfs2_setup_osb_uuid(osb, di->id2.i_super.s_uuid,
1690                                  sizeof(di->id2.i_super.s_uuid))) {
1691                 mlog(ML_ERROR, "Out of memory trying to setup our uuid.\n");
1692                 status = -ENOMEM;
1693                 goto bail;
1694         }
1695
1696         memcpy(&uuid_net_key, di->id2.i_super.s_uuid, sizeof(uuid_net_key));
1697
1698         strncpy(osb->vol_label, di->id2.i_super.s_label, 63);
1699         osb->vol_label[63] = '\0';
1700         osb->root_blkno = le64_to_cpu(di->id2.i_super.s_root_blkno);
1701         osb->system_dir_blkno = le64_to_cpu(di->id2.i_super.s_system_dir_blkno);
1702         osb->first_cluster_group_blkno =
1703                 le64_to_cpu(di->id2.i_super.s_first_cluster_group);
1704         osb->fs_generation = le32_to_cpu(di->i_fs_generation);
1705         osb->uuid_hash = le32_to_cpu(di->id2.i_super.s_uuid_hash);
1706         mlog(0, "vol_label: %s\n", osb->vol_label);
1707         mlog(0, "uuid: %s\n", osb->uuid_str);
1708         mlog(0, "root_blkno=%llu, system_dir_blkno=%llu\n",
1709              (unsigned long long)osb->root_blkno,
1710              (unsigned long long)osb->system_dir_blkno);
1711
1712         osb->osb_dlm_debug = ocfs2_new_dlm_debug();
1713         if (!osb->osb_dlm_debug) {
1714                 status = -ENOMEM;
1715                 mlog_errno(status);
1716                 goto bail;
1717         }
1718
1719         atomic_set(&osb->vol_state, VOLUME_INIT);
1720
1721         /* load root, system_dir, and all global system inodes */
1722         status = ocfs2_init_global_system_inodes(osb);
1723         if (status < 0) {
1724                 mlog_errno(status);
1725                 goto bail;
1726         }
1727
1728         /*
1729          * global bitmap
1730          */
1731         inode = ocfs2_get_system_file_inode(osb, GLOBAL_BITMAP_SYSTEM_INODE,
1732                                             OCFS2_INVALID_SLOT);
1733         if (!inode) {
1734                 status = -EINVAL;
1735                 mlog_errno(status);
1736                 goto bail;
1737         }
1738
1739         osb->bitmap_blkno = OCFS2_I(inode)->ip_blkno;
1740         iput(inode);
1741
1742         osb->bitmap_cpg = ocfs2_group_bitmap_size(sb) * 8;
1743
1744         status = ocfs2_init_slot_info(osb);
1745         if (status < 0) {
1746                 mlog_errno(status);
1747                 goto bail;
1748         }
1749
1750 bail:
1751         mlog_exit(status);
1752         return status;
1753 }
1754
1755 /*
1756  * will return: -EAGAIN if it is ok to keep searching for superblocks
1757  *              -EINVAL if there is a bad superblock
1758  *              0 on success
1759  */
1760 static int ocfs2_verify_volume(struct ocfs2_dinode *di,
1761                                struct buffer_head *bh,
1762                                u32 blksz)
1763 {
1764         int status = -EAGAIN;
1765
1766         mlog_entry_void();
1767
1768         if (memcmp(di->i_signature, OCFS2_SUPER_BLOCK_SIGNATURE,
1769                    strlen(OCFS2_SUPER_BLOCK_SIGNATURE)) == 0) {
1770                 status = -EINVAL;
1771                 if ((1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits)) != blksz) {
1772                         mlog(ML_ERROR, "found superblock with incorrect block "
1773                              "size: found %u, should be %u\n",
1774                              1 << le32_to_cpu(di->id2.i_super.s_blocksize_bits),
1775                                blksz);
1776                 } else if (le16_to_cpu(di->id2.i_super.s_major_rev_level) !=
1777                            OCFS2_MAJOR_REV_LEVEL ||
1778                            le16_to_cpu(di->id2.i_super.s_minor_rev_level) !=
1779                            OCFS2_MINOR_REV_LEVEL) {
1780                         mlog(ML_ERROR, "found superblock with bad version: "
1781                              "found %u.%u, should be %u.%u\n",
1782                              le16_to_cpu(di->id2.i_super.s_major_rev_level),
1783                              le16_to_cpu(di->id2.i_super.s_minor_rev_level),
1784                              OCFS2_MAJOR_REV_LEVEL,
1785                              OCFS2_MINOR_REV_LEVEL);
1786                 } else if (bh->b_blocknr != le64_to_cpu(di->i_blkno)) {
1787                         mlog(ML_ERROR, "bad block number on superblock: "
1788                              "found %llu, should be %llu\n",
1789                              (unsigned long long)le64_to_cpu(di->i_blkno),
1790                              (unsigned long long)bh->b_blocknr);
1791                 } else if (le32_to_cpu(di->id2.i_super.s_clustersize_bits) < 12 ||
1792                             le32_to_cpu(di->id2.i_super.s_clustersize_bits) > 20) {
1793                         mlog(ML_ERROR, "bad cluster size found: %u\n",
1794                              1 << le32_to_cpu(di->id2.i_super.s_clustersize_bits));
1795                 } else if (!le64_to_cpu(di->id2.i_super.s_root_blkno)) {
1796                         mlog(ML_ERROR, "bad root_blkno: 0\n");
1797                 } else if (!le64_to_cpu(di->id2.i_super.s_system_dir_blkno)) {
1798                         mlog(ML_ERROR, "bad system_dir_blkno: 0\n");
1799                 } else if (le16_to_cpu(di->id2.i_super.s_max_slots) > OCFS2_MAX_SLOTS) {
1800                         mlog(ML_ERROR,
1801                              "Superblock slots found greater than file system "
1802                              "maximum: found %u, max %u\n",
1803                              le16_to_cpu(di->id2.i_super.s_max_slots),
1804                              OCFS2_MAX_SLOTS);
1805                 } else {
1806                         /* found it! */
1807                         status = 0;
1808                 }
1809         }
1810
1811         mlog_exit(status);
1812         return status;
1813 }
1814
1815 static int ocfs2_check_volume(struct ocfs2_super *osb)
1816 {
1817         int status;
1818         int dirty;
1819         int local;
1820         struct ocfs2_dinode *local_alloc = NULL; /* only used if we
1821                                                   * recover
1822                                                   * ourselves. */
1823
1824         mlog_entry_void();
1825
1826         /* Init our journal object. */
1827         status = ocfs2_journal_init(osb->journal, &dirty);
1828         if (status < 0) {
1829                 mlog(ML_ERROR, "Could not initialize journal!\n");
1830                 goto finally;
1831         }
1832
1833         /* If the journal was unmounted cleanly then we don't want to
1834          * recover anything. Otherwise, journal_load will do that
1835          * dirty work for us :) */
1836         if (!dirty) {
1837                 status = ocfs2_journal_wipe(osb->journal, 0);
1838                 if (status < 0) {
1839                         mlog_errno(status);
1840                         goto finally;
1841                 }
1842         } else {
1843                 mlog(ML_NOTICE, "File system was not unmounted cleanly, "
1844                      "recovering volume.\n");
1845         }
1846
1847         local = ocfs2_mount_local(osb);
1848
1849         /* will play back anything left in the journal. */
1850         status = ocfs2_journal_load(osb->journal, local, dirty);
1851         if (status < 0) {
1852                 mlog(ML_ERROR, "ocfs2 journal load failed! %d\n", status);
1853                 goto finally;
1854         }
1855
1856         if (dirty) {
1857                 /* recover my local alloc if we didn't unmount cleanly. */
1858                 status = ocfs2_begin_local_alloc_recovery(osb,
1859                                                           osb->slot_num,
1860                                                           &local_alloc);
1861                 if (status < 0) {
1862                         mlog_errno(status);
1863                         goto finally;
1864                 }
1865                 /* we complete the recovery process after we've marked
1866                  * ourselves as mounted. */
1867         }
1868
1869         mlog(0, "Journal loaded.\n");
1870
1871         status = ocfs2_load_local_alloc(osb);
1872         if (status < 0) {
1873                 mlog_errno(status);
1874                 goto finally;
1875         }
1876
1877         if (dirty) {
1878                 /* Recovery will be completed after we've mounted the
1879                  * rest of the volume. */
1880                 osb->dirty = 1;
1881                 osb->local_alloc_copy = local_alloc;
1882                 local_alloc = NULL;
1883         }
1884
1885         /* go through each journal, trylock it and if you get the
1886          * lock, and it's marked as dirty, set the bit in the recover
1887          * map and launch a recovery thread for it. */
1888         status = ocfs2_mark_dead_nodes(osb);
1889         if (status < 0)
1890                 mlog_errno(status);
1891
1892 finally:
1893         if (local_alloc)
1894                 kfree(local_alloc);
1895
1896         mlog_exit(status);
1897         return status;
1898 }
1899
1900 /*
1901  * The routine gets called from dismount or close whenever a dismount on
1902  * volume is requested and the osb open count becomes 1.
1903  * It will remove the osb from the global list and also free up all the
1904  * initialized resources and fileobject.
1905  */
1906 static void ocfs2_delete_osb(struct ocfs2_super *osb)
1907 {
1908         mlog_entry_void();
1909
1910         /* This function assumes that the caller has the main osb resource */
1911
1912         ocfs2_free_slot_info(osb);
1913
1914         kfree(osb->osb_orphan_wipes);
1915         kfree(osb->slot_recovery_generations);
1916         /* FIXME
1917          * This belongs in journal shutdown, but because we have to
1918          * allocate osb->journal at the start of ocfs2_initalize_osb(),
1919          * we free it here.
1920          */
1921         kfree(osb->journal);
1922         if (osb->local_alloc_copy)
1923                 kfree(osb->local_alloc_copy);
1924         kfree(osb->uuid_str);
1925         ocfs2_put_dlm_debug(osb->osb_dlm_debug);
1926         memset(osb, 0, sizeof(struct ocfs2_super));
1927
1928         mlog_exit_void();
1929 }
1930
1931 /* Put OCFS2 into a readonly state, or (if the user specifies it),
1932  * panic(). We do not support continue-on-error operation. */
1933 static void ocfs2_handle_error(struct super_block *sb)
1934 {
1935         struct ocfs2_super *osb = OCFS2_SB(sb);
1936
1937         if (osb->s_mount_opt & OCFS2_MOUNT_ERRORS_PANIC)
1938                 panic("OCFS2: (device %s): panic forced after error\n",
1939                       sb->s_id);
1940
1941         ocfs2_set_osb_flag(osb, OCFS2_OSB_ERROR_FS);
1942
1943         if (sb->s_flags & MS_RDONLY &&
1944             (ocfs2_is_soft_readonly(osb) ||
1945              ocfs2_is_hard_readonly(osb)))
1946                 return;
1947
1948         printk(KERN_CRIT "File system is now read-only due to the potential "
1949                "of on-disk corruption. Please run fsck.ocfs2 once the file "
1950                "system is unmounted.\n");
1951         sb->s_flags |= MS_RDONLY;
1952         ocfs2_set_ro_flag(osb, 0);
1953 }
1954
1955 static char error_buf[1024];
1956
1957 void __ocfs2_error(struct super_block *sb,
1958                    const char *function,
1959                    const char *fmt, ...)
1960 {
1961         va_list args;
1962
1963         va_start(args, fmt);
1964         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1965         va_end(args);
1966
1967         /* Not using mlog here because we want to show the actual
1968          * function the error came from. */
1969         printk(KERN_CRIT "OCFS2: ERROR (device %s): %s: %s\n",
1970                sb->s_id, function, error_buf);
1971
1972         ocfs2_handle_error(sb);
1973 }
1974
1975 /* Handle critical errors. This is intentionally more drastic than
1976  * ocfs2_handle_error, so we only use for things like journal errors,
1977  * etc. */
1978 void __ocfs2_abort(struct super_block* sb,
1979                    const char *function,
1980                    const char *fmt, ...)
1981 {
1982         va_list args;
1983
1984         va_start(args, fmt);
1985         vsnprintf(error_buf, sizeof(error_buf), fmt, args);
1986         va_end(args);
1987
1988         printk(KERN_CRIT "OCFS2: abort (device %s): %s: %s\n",
1989                sb->s_id, function, error_buf);
1990
1991         /* We don't have the cluster support yet to go straight to
1992          * hard readonly in here. Until then, we want to keep
1993          * ocfs2_abort() so that we can at least mark critical
1994          * errors.
1995          *
1996          * TODO: This should abort the journal and alert other nodes
1997          * that our slot needs recovery. */
1998
1999         /* Force a panic(). This stinks, but it's better than letting
2000          * things continue without having a proper hard readonly
2001          * here. */
2002         OCFS2_SB(sb)->s_mount_opt |= OCFS2_MOUNT_ERRORS_PANIC;
2003         ocfs2_handle_error(sb);
2004 }
2005
2006 module_init(ocfs2_init);
2007 module_exit(ocfs2_exit);