On Thu, 6 Nov 2014 10:19:54 -0500, Josef Bacik wrote:
If we have two fsync()'s race on different subvols one will do all of its work
to get into the log_tree, wait on it's outstanding IO, and then allow the
log_tree to finish it's commit. The problem is we were just free'ing that
subvols logged extents instead of waiting on them, so whoever lost the race
wouldn't really have their data on disk. Fix this by waiting properly instead
of freeing the logged extents. Thanks,
cc: sta...@vger.kernel.org
Signed-off-by: Josef Bacik jba...@fb.com
---
fs/btrfs/tree-log.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 2d0fa43..70f99b1 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -2600,9 +2600,9 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans,
if (atomic_read(log_root_tree-log_commit[index2])) {
blk_finish_plug(plug);
btrfs_wait_marked_extents(log, log-dirty_log_pages, mark);
+ btrfs_wait_logged_extents(log, log_transid);
Why not add this log root into a list of log root tree, and then the committer
wait all ordered extents in each log root which is added in that list? By this
way, we can let the committer do some work during the data of ordered extents
is
being transferred to the disk.
Thanks
Miao
wait_log_commit(trans, log_root_tree,
root_log_ctx.log_transid);
- btrfs_free_logged_extents(log, log_transid);
mutex_unlock(log_root_tree-log_mutex);
ret = root_log_ctx.log_ret;
goto out;
--
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