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jbd: abort instead of waiting for nonexistent transactions 

The __log_wait_for_space function sits in a loop checkpointing
transactions until there is sufficient space free in the journal.
However, if there are no transactions to be processed (e.g.  because the
free space calculation is wrong due to a corrupted filesystem) it will
never progress.

Check for space being required when no transactions are outstanding and
abort the journal instead of endlessly looping.

This patch fixes the bug reported by Sami Liedes at:
http://bugzilla.kernel.org/show_bug.cgi?id=10976

Signed-off-by: Duane Griffin <duaneg@dghda.com>
Tested-by: Sami Liedes <sliedes@cc.hut.fi>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Duane Griffin 2008-10-22 14:15:03 -07:00 committed by Linus Torvalds
parent 9f818b4ac0
commit be07c4ed40
1 changed files with 17 additions and 2 deletions
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19
fs/jbd/checkpoint.c
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@ -127,14 +127,29 @@ void __log_wait_for_space(journal_t *journal)
/*
* Test again, another process may have checkpointed while we
* were waiting for the checkpoint lock
* were waiting for the checkpoint lock. If there are no
* outstanding transactions there is nothing to checkpoint and
* we can't make progress. Abort the journal in this case.
*/
spin_lock(&journal->j_state_lock);
spin_lock(&journal->j_list_lock);
nblocks = jbd_space_needed(journal);
if (__log_space_left(journal) < nblocks) {
int chkpt = journal->j_checkpoint_transactions != NULL;
spin_unlock(&journal->j_list_lock);
spin_unlock(&journal->j_state_lock);
log_do_checkpoint(journal);
if (chkpt) {
log_do_checkpoint(journal);
} else {
printk(KERN_ERR "%s: no transactions\n",
__func__);
journal_abort(journal, 0);
}
spin_lock(&journal->j_state_lock);
} else {
spin_unlock(&journal->j_list_lock);
}
mutex_unlock(&journal->j_checkpoint_mutex);
}