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ext4: support freezing ext2 (nojournal) file systems

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Through an oversight, when we added nojournal support to ext4, we
didn't add support to allow file system freezing.  This is relatively
easy to add, so let's do it.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Dexuan Cui <decui@microsoft.com>
This commit is contained in:
Theodore Ts'o 2014-09-18 17:12:02 -04:00
parent bda3253043
commit bb04457658
1 changed files with 16 additions and 11 deletions
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27
fs/ext4/super.c
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@ -1131,6 +1131,8 @@ static const struct super_operations ext4_nojournal_sops = {
.drop_inode = ext4_drop_inode,
.evict_inode = ext4_evict_inode,
.sync_fs = ext4_sync_fs,
.freeze_fs = ext4_freeze,
.unfreeze_fs = ext4_unfreeze,
.put_super = ext4_put_super,
.statfs = ext4_statfs,
.remount_fs = ext4_remount,
@ -4758,23 +4760,26 @@ static int ext4_freeze(struct super_block *sb)
journal = EXT4_SB(sb)->s_journal;
/* Now we set up the journal barrier. */
jbd2_journal_lock_updates(journal);
if (journal) {
/* Now we set up the journal barrier. */
jbd2_journal_lock_updates(journal);
/*
* Don't clear the needs_recovery flag if we failed to flush
* the journal.
*/
error = jbd2_journal_flush(journal);
if (error < 0)
goto out;
/*
* Don't clear the needs_recovery flag if we failed to
* flush the journal.
*/
error = jbd2_journal_flush(journal);
if (error < 0)
goto out;
}
/* Journal blocked and flushed, clear needs_recovery flag. */
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
error = ext4_commit_super(sb, 1);
out:
/* we rely on upper layer to stop further updates */
jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
if (journal)
/* we rely on upper layer to stop further updates */
jbd2_journal_unlock_updates(journal);
return error;
}