Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix kconfig typo and extra whitespace
  ext4: fix build failure without procfs
  ext4: add an option to control error handling on file data
  jbd2: don't dirty original metadata buffer on abort
  ext4: add checks for errors from jbd2
  jbd2: fix error handling for checkpoint io
  jbd2: abort when failed to log metadata buffers

10 files changed, 131 insertions, 32 deletions

diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 74484e696405..eb154ef36c2a 100644
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -223,6 +223,11 @@ errors=remount-ro(*)	Remount the filesystem read-only on an error.
 errors=continue         Keep going on a filesystem error.
 errors=panic            Panic and halt the machine if an error occurs.
 
+data_err=ignore(*)      Just print an error message if an error occurs
+                        in a file data buffer in ordered mode.
+data_err=abort          Abort the journal if an error occurs in a file
+                        data buffer in ordered mode.
+
 grpid                   Give objects the same group ID as their creator.
 bsdgroups
 
diff --git a/fs/Kconfig b/fs/Kconfig
index 40183d94b683..f54a157a0296 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -170,8 +170,8 @@ config EXT4DEV_COMPAT
         help
           Starting with 2.6.28, the name of the ext4 filesystem was
           renamed from ext4dev to ext4.  Unfortunately there are some
-          lagecy userspace programs (such as klibc's fstype) have
-          "ext4dev" hardcoded.  
+          legacy userspace programs (such as klibc's fstype) have
+          "ext4dev" hardcoded.
 
           To enable backwards compatibility so that systems that are
           still expecting to mount ext4 filesystems using ext4dev,
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index f46a513a5157..6690a41cdd9f 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -540,6 +540,8 @@ do {									       \
 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
 #define EXT4_MOUNT_I_VERSION            0x2000000 /* i_version support */
 #define EXT4_MOUNT_DELALLOC             0x8000000 /* Delalloc support */
+#define EXT4_MOUNT_DATA_ERR_ABORT       0x10000000 /* Abort on file data write */
+
 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
 #ifndef _LINUX_EXT2_FS_H
 #define clear_opt(o, opt)               o &= ~EXT4_MOUNT_##opt
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index ea27eaa0cfe5..dc99b4776d58 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -192,7 +192,7 @@ setversion_out:
         case EXT4_IOC_GROUP_EXTEND: {
                 ext4_fsblk_t n_blocks_count;
                 struct super_block *sb = inode->i_sb;
-                int err;
+                int err, err2;
 
                 if (!capable(CAP_SYS_RESOURCE))
                         return -EPERM;
@@ -206,8 +206,10 @@ setversion_out:
 
                 err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
-                jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+                err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+                if (err == 0)
+                        err = err2;
                 mnt_drop_write(filp->f_path.mnt);
 
                 return err;
@@ -215,7 +217,7 @@ setversion_out:
         case EXT4_IOC_GROUP_ADD: {
                 struct ext4_new_group_data input;
                 struct super_block *sb = inode->i_sb;
-                int err;
+                int err, err2;
 
                 if (!capable(CAP_SYS_RESOURCE))
                         return -EPERM;
@@ -230,8 +232,10 @@ setversion_out:
 
                 err = ext4_group_add(sb, &input);
                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
-                jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+                err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+                if (err == 0)
+                        err = err2;
                 mnt_drop_write(filp->f_path.mnt);
 
                 return err;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 0e661c569660..fb940c22ab0d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -507,7 +507,8 @@ static void ext4_put_super(struct super_block *sb)
         ext4_mb_release(sb);
         ext4_ext_release(sb);
         ext4_xattr_put_super(sb);
-        jbd2_journal_destroy(sbi->s_journal);
+        if (jbd2_journal_destroy(sbi->s_journal) < 0)
+                ext4_abort(sb, __func__, "Couldn't clean up the journal");
         sbi->s_journal = NULL;
         if (!(sb->s_flags & MS_RDONLY)) {
                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
@@ -777,6 +778,9 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
                 seq_printf(seq, ",inode_readahead_blks=%u",
                            sbi->s_inode_readahead_blks);
 
+        if (test_opt(sb, DATA_ERR_ABORT))
+                seq_puts(seq, ",data_err=abort");
+
         ext4_show_quota_options(seq, sb);
         return 0;
 }
@@ -906,6 +910,7 @@ enum {
         Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,
         Opt_journal_checksum, Opt_journal_async_commit,
         Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,
+        Opt_data_err_abort, Opt_data_err_ignore,
         Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
         Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
         Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
@@ -952,6 +957,8 @@ static match_table_t tokens = {
         {Opt_data_journal, "data=journal"},
         {Opt_data_ordered, "data=ordered"},
         {Opt_data_writeback, "data=writeback"},
+        {Opt_data_err_abort, "data_err=abort"},
+        {Opt_data_err_ignore, "data_err=ignore"},
         {Opt_offusrjquota, "usrjquota="},
         {Opt_usrjquota, "usrjquota=%s"},
         {Opt_offgrpjquota, "grpjquota="},
@@ -1186,6 +1193,12 @@ static int parse_options(char *options, struct super_block *sb,
                                 sbi->s_mount_opt |= data_opt;
                         }
                         break;
+                case Opt_data_err_abort:
+                        set_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
+                        break;
+                case Opt_data_err_ignore:
+                        clear_opt(sbi->s_mount_opt, DATA_ERR_ABORT);
+                        break;
 #ifdef CONFIG_QUOTA
                 case Opt_usrjquota:
                         qtype = USRQUOTA;
@@ -2218,6 +2231,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
                 goto failed_mount;
         }
 
+#ifdef CONFIG_PROC_FS
         if (ext4_proc_root)
                 sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
 
@@ -2225,6 +2239,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
                 proc_create_data("inode_readahead_blks", 0644, sbi->s_proc,
                                  &ext4_ui_proc_fops,
                                  &sbi->s_inode_readahead_blks);
+#endif
 
         bgl_lock_init(&sbi->s_blockgroup_lock);
 
@@ -2534,6 +2549,10 @@ static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
                 journal->j_flags |= JBD2_BARRIER;
         else
                 journal->j_flags &= ~JBD2_BARRIER;
+        if (test_opt(sb, DATA_ERR_ABORT))
+                journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
+        else
+                journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
         spin_unlock(&journal->j_state_lock);
 }
 
@@ -2853,7 +2872,9 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
         journal_t *journal = EXT4_SB(sb)->s_journal;
 
         jbd2_journal_lock_updates(journal);
-        jbd2_journal_flush(journal);
+        if (jbd2_journal_flush(journal) < 0)
+                goto out;
+
         lock_super(sb);
         if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER) &&
             sb->s_flags & MS_RDONLY) {
@@ -2862,6 +2883,8 @@ static void ext4_mark_recovery_complete(struct super_block *sb,
                 ext4_commit_super(sb, es, 1);
         }
         unlock_super(sb);
+
+out:
         jbd2_journal_unlock_updates(journal);
 }
 
@@ -2962,7 +2985,13 @@ static void ext4_write_super_lockfs(struct super_block *sb)
 
                 /* Now we set up the journal barrier. */
                 jbd2_journal_lock_updates(journal);
-                jbd2_journal_flush(journal);
+
+                /*
+                 * We don't want to clear needs_recovery flag when we failed
+                 * to flush the journal.
+                 */
+                if (jbd2_journal_flush(journal) < 0)
+                        return;
 
                 /* Journal blocked and flushed, clear needs_recovery flag. */
                 EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
@@ -3402,8 +3431,12 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
                  * otherwise be livelocked...
                  */
                 jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
-                jbd2_journal_flush(EXT4_SB(sb)->s_journal);
+                err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
                 jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
+                if (err) {
+                        path_put(&nd.path);
+                        return err;
+                }
         }
 
         err = vfs_quota_on_path(sb, type, format_id, &nd.path);
diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
index 42895d369458..9203c3332f17 100644
--- a/fs/jbd2/checkpoint.c
+++ b/fs/jbd2/checkpoint.c
@@ -94,7 +94,8 @@ static int __try_to_free_cp_buf(struct journal_head *jh)
         int ret = 0;
         struct buffer_head *bh = jh2bh(jh);
 
-        if (jh->b_jlist == BJ_None && !buffer_locked(bh) && !buffer_dirty(bh)) {
+        if (jh->b_jlist == BJ_None && !buffer_locked(bh) &&
+            !buffer_dirty(bh) && !buffer_write_io_error(bh)) {
                 JBUFFER_TRACE(jh, "remove from checkpoint list");
                 ret = __jbd2_journal_remove_checkpoint(jh) + 1;
                 jbd_unlock_bh_state(bh);
@@ -176,21 +177,25 @@ static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh)
  * buffers. Note that we take the buffers in the opposite ordering
  * from the one in which they were submitted for IO.
  *
+ * Return 0 on success, and return <0 if some buffers have failed
+ * to be written out.
+ *
  * Called with j_list_lock held.
  */
-static void __wait_cp_io(journal_t *journal, transaction_t *transaction)
+static int __wait_cp_io(journal_t *journal, transaction_t *transaction)
 {
         struct journal_head *jh;
         struct buffer_head *bh;
         tid_t this_tid;
         int released = 0;
+        int ret = 0;
 
         this_tid = transaction->t_tid;
 restart:
         /* Did somebody clean up the transaction in the meanwhile? */
         if (journal->j_checkpoint_transactions != transaction ||
                         transaction->t_tid != this_tid)
-                return;
+                return ret;
         while (!released && transaction->t_checkpoint_io_list) {
                 jh = transaction->t_checkpoint_io_list;
                 bh = jh2bh(jh);
@@ -210,6 +215,9 @@ restart:
                         spin_lock(&journal->j_list_lock);
                         goto restart;
                 }
+                if (unlikely(buffer_write_io_error(bh)))
+                        ret = -EIO;
+
                 /*
                  * Now in whatever state the buffer currently is, we know that
                  * it has been written out and so we can drop it from the list
@@ -219,6 +227,8 @@ restart:
                 jbd2_journal_remove_journal_head(bh);
                 __brelse(bh);
         }
+
+        return ret;
 }
 
 #define NR_BATCH        64
@@ -242,7 +252,8 @@ __flush_batch(journal_t *journal, struct buffer_head **bhs, int *batch_count)
  * Try to flush one buffer from the checkpoint list to disk.
  *
  * Return 1 if something happened which requires us to abort the current
- * scan of the checkpoint list.
+ * scan of the checkpoint list.  Return <0 if the buffer has failed to
+ * be written out.
  *
  * Called with j_list_lock held and drops it if 1 is returned
  * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it
@@ -274,6 +285,9 @@ static int __process_buffer(journal_t *journal, struct journal_head *jh,
                 jbd2_log_wait_commit(journal, tid);
                 ret = 1;
         } else if (!buffer_dirty(bh)) {
+                ret = 1;
+                if (unlikely(buffer_write_io_error(bh)))
+                        ret = -EIO;
                 J_ASSERT_JH(jh, !buffer_jbddirty(bh));
                 BUFFER_TRACE(bh, "remove from checkpoint");
                 __jbd2_journal_remove_checkpoint(jh);
@@ -281,7 +295,6 @@ static int __process_buffer(journal_t *journal, struct journal_head *jh,
                 jbd_unlock_bh_state(bh);
                 jbd2_journal_remove_journal_head(bh);
                 __brelse(bh);
-                ret = 1;
         } else {
                 /*
                  * Important: we are about to write the buffer, and
@@ -314,6 +327,7 @@ static int __process_buffer(journal_t *journal, struct journal_head *jh,
  * to disk. We submit larger chunks of data at once.
  *
  * The journal should be locked before calling this function.
+ * Called with j_checkpoint_mutex held.
  */
 int jbd2_log_do_checkpoint(journal_t *journal)
 {
@@ -339,6 +353,7 @@ int jbd2_log_do_checkpoint(journal_t *journal)
          * OK, we need to start writing disk blocks.  Take one transaction
          * and write it.
          */
+        result = 0;
         spin_lock(&journal->j_list_lock);
         if (!journal->j_checkpoint_transactions)
                 goto out;
@@ -357,7 +372,7 @@ restart:
                 int batch_count = 0;
                 struct buffer_head *bhs[NR_BATCH];
                 struct journal_head *jh;
-                int retry = 0;
+                int retry = 0, err;
 
                 while (!retry && transaction->t_checkpoint_list) {
                         struct buffer_head *bh;
@@ -371,6 +386,8 @@ restart:
                         }
                         retry = __process_buffer(journal, jh, bhs, &batch_count,
                                                  transaction);
+                        if (retry < 0 && !result)
+                                result = retry;
                         if (!retry && (need_resched() ||
                                 spin_needbreak(&journal->j_list_lock))) {
                                 spin_unlock(&journal->j_list_lock);
@@ -395,14 +412,18 @@ restart:
                  * Now we have cleaned up the first transaction's checkpoint
                  * list. Let's clean up the second one
                  */
-                __wait_cp_io(journal, transaction);
+                err = __wait_cp_io(journal, transaction);
+                if (!result)
+                        result = err;
         }
 out:
         spin_unlock(&journal->j_list_lock);
-        result = jbd2_cleanup_journal_tail(journal);
         if (result < 0)
-                return result;
-        return 0;
+                jbd2_journal_abort(journal, result);
+        else
+                result = jbd2_cleanup_journal_tail(journal);
+
+        return (result < 0) ? result : 0;
 }
 
 /*
@@ -418,8 +439,9 @@ out:
  * This is the only part of the journaling code which really needs to be
  * aware of transaction aborts.  Checkpointing involves writing to the
  * main filesystem area rather than to the journal, so it can proceed
- * even in abort state, but we must not update the journal superblock if
- * we have an abort error outstanding.
+ * even in abort state, but we must not update the super block if
+ * checkpointing may have failed.  Otherwise, we would lose some metadata
+ * buffers which should be written-back to the filesystem.
  */
 
 int jbd2_cleanup_journal_tail(journal_t *journal)
@@ -428,6 +450,9 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
         tid_t           first_tid;
         unsigned long   blocknr, freed;
 
+        if (is_journal_aborted(journal))
+                return 1;
+
         /* OK, work out the oldest transaction remaining in the log, and
          * the log block it starts at.
          *
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 0d3814a35ed1..0abe02c4242a 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -504,9 +504,10 @@ void jbd2_journal_commit_transaction(journal_t *journal)
                 jh = commit_transaction->t_buffers;
 
                 /* If we're in abort mode, we just un-journal the buffer and
-                   release it for background writing. */
+                   release it. */
 
                 if (is_journal_aborted(journal)) {
+                        clear_buffer_jbddirty(jh2bh(jh));
                         JBUFFER_TRACE(jh, "journal is aborting: refile");
                         jbd2_journal_refile_buffer(journal, jh);
                         /* If that was the last one, we need to clean up
@@ -683,6 +684,8 @@ start_journal_io:
                 printk(KERN_WARNING
                         "JBD2: Detected IO errors while flushing file data "
                        "on %s\n", journal->j_devname);
+                if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR)
+                        jbd2_journal_abort(journal, err);
                 err = 0;
         }
 
@@ -783,6 +786,9 @@ wait_for_iobuf:
                 /* AKPM: bforget here */
         }
 
+        if (err)
+                jbd2_journal_abort(journal, err);
+
         jbd_debug(3, "JBD: commit phase 5\n");
 
         if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
@@ -881,6 +887,8 @@ restart_loop:
                 if (buffer_jbddirty(bh)) {
                         JBUFFER_TRACE(jh, "add to new checkpointing trans");
                         __jbd2_journal_insert_checkpoint(jh, commit_transaction);
+                        if (is_journal_aborted(journal))
+                                clear_buffer_jbddirty(bh);
                         JBUFFER_TRACE(jh, "refile for checkpoint writeback");
                         __jbd2_journal_refile_buffer(jh);
                         jbd_unlock_bh_state(bh);
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 01c3901c3a07..783de118de92 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1451,9 +1451,12 @@ recovery_error:
  *
  * Release a journal_t structure once it is no longer in use by the
  * journaled object.
+ * Return <0 if we couldn't clean up the journal.
  */
-void jbd2_journal_destroy(journal_t *journal)
+int jbd2_journal_destroy(journal_t *journal)
 {
+        int err = 0;
+
         /* Wait for the commit thread to wake up and die. */
         journal_kill_thread(journal);
 
@@ -1476,11 +1479,16 @@ void jbd2_journal_destroy(journal_t *journal)
         J_ASSERT(journal->j_checkpoint_transactions == NULL);
         spin_unlock(&journal->j_list_lock);
 
-        /* We can now mark the journal as empty. */
-        journal->j_tail = 0;
-        journal->j_tail_sequence = ++journal->j_transaction_sequence;
         if (journal->j_sb_buffer) {
-                jbd2_journal_update_superblock(journal, 1);
+                if (!is_journal_aborted(journal)) {
+                        /* We can now mark the journal as empty. */
+                        journal->j_tail = 0;
+                        journal->j_tail_sequence =
+                                ++journal->j_transaction_sequence;
+                        jbd2_journal_update_superblock(journal, 1);
+                } else {
+                        err = -EIO;
+                }
                 brelse(journal->j_sb_buffer);
         }
 
@@ -1492,6 +1500,8 @@ void jbd2_journal_destroy(journal_t *journal)
                 jbd2_journal_destroy_revoke(journal);
         kfree(journal->j_wbuf);
         kfree(journal);
+
+        return err;
 }
 
 
@@ -1717,10 +1727,16 @@ int jbd2_journal_flush(journal_t *journal)
         spin_lock(&journal->j_list_lock);
         while (!err && journal->j_checkpoint_transactions != NULL) {
                 spin_unlock(&journal->j_list_lock);
+                mutex_lock(&journal->j_checkpoint_mutex);
                 err = jbd2_log_do_checkpoint(journal);
+                mutex_unlock(&journal->j_checkpoint_mutex);
                 spin_lock(&journal->j_list_lock);
         }
         spin_unlock(&journal->j_list_lock);
+
+        if (is_journal_aborted(journal))
+                return -EIO;
+
         jbd2_cleanup_journal_tail(journal);
 
         /* Finally, mark the journal as really needing no recovery.
@@ -1742,7 +1758,7 @@ int jbd2_journal_flush(journal_t *journal)
         J_ASSERT(journal->j_head == journal->j_tail);
         J_ASSERT(journal->j_tail_sequence == journal->j_transaction_sequence);
         spin_unlock(&journal->j_state_lock);
-        return err;
+        return 0;
 }
 
 /**
diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 058f50f65b76..73063285b13f 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -225,7 +225,7 @@ do {									\
  */
 int jbd2_journal_recover(journal_t *journal)
 {
-        int                     err;
+        int                     err, err2;
         journal_superblock_t *  sb;
 
         struct recovery_info    info;
@@ -263,7 +263,10 @@ int jbd2_journal_recover(journal_t *journal)
         journal->j_transaction_sequence = ++info.end_transaction;
 
         jbd2_journal_clear_revoke(journal);
-        sync_blockdev(journal->j_fs_dev);
+        err2 = sync_blockdev(journal->j_fs_dev);
+        if (!err)
+                err = err2;
+
         return err;
 }
 
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 66c3499478b5..d2e91ea998fd 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -967,6 +967,9 @@ struct journal_s
 #define JBD2_FLUSHED    0x008   /* The journal superblock has been flushed */
 #define JBD2_LOADED     0x010   /* The journal superblock has been loaded */
 #define JBD2_BARRIER    0x020   /* Use IDE barriers */
+#define JBD2_ABORT_ON_SYNCDATA_ERR      0x040   /* Abort the journal on file
+                                                 * data write error in ordered
+                                                 * mode */
 
 /*
  * Function declarations for the journaling transaction and buffer
@@ -1060,7 +1063,7 @@ extern void	   jbd2_journal_clear_features
                    (journal_t *, unsigned long, unsigned long, unsigned long);
 extern int         jbd2_journal_create     (journal_t *);
 extern int         jbd2_journal_load       (journal_t *journal);
-extern void        jbd2_journal_destroy    (journal_t *);
+extern int         jbd2_journal_destroy    (journal_t *);
 extern int         jbd2_journal_recover    (journal_t *journal);
 extern int         jbd2_journal_wipe       (journal_t *, int);
 extern int         jbd2_journal_skip_recovery   (journal_t *);