[PATCH] ext4: release discard bio after sending discard commands

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We've changed the discard command handling into parallel manner.
But, in this change, I forgot decreasing the usage count of the bio
which was used to send discard request. I'm sorry about that.

Signed-off-by: Daeho Jeong <daeho.jeong@xxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Fixes: a015434480dc ("ext4: send parallel discards on commit
completions")
---
 fs/ext4/mballoc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index ab70b69e644c..88317b0cf7b8 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2892,8 +2892,10 @@ void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid)
 				break;
 		}
 
-		if (discard_bio)
+		if (discard_bio) {
 			submit_bio_wait(discard_bio);
+			bio_put(discard_bio);
+		}
 	}
 
 	list_for_each_entry_safe(entry, tmp, &freed_data_list, efd_list)
-- 
2.13.0




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