From d77fe802ae851a65356b1691ff97cd568b9e7d5c Mon Sep 17 00:00:00 2001
From: Josef Bacik <jbacik@fb.com>
Date: Thu, 6 Nov 2014 10:19:54 -0500
Subject: [PATCH] Btrfs: make sure we wait on logged extents when fsycning two
subvols
commit 9dba8cf128ef98257ca719722280c9634e7e9dc7 upstream.
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,
Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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 286213c..fc715ff 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);
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;
--
1.9.1