Btrfs: fix unprotected ->log_batch
We forget to protect ->log_batch when syncing a file, this patch fix
this problem by atomic operation. And ->log_batch is used to check
if there are parallel sync operations or not, so it is unnecessary to
reset it to 0 after the sync operation of the current log tree complete.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 2990a7e..6923b9e4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1491,9 +1491,9 @@
wait_queue_head_t log_commit_wait[2];
atomic_t log_writers;
atomic_t log_commit[2];
+ atomic_t log_batch;
unsigned long log_transid;
unsigned long last_log_commit;
- unsigned long log_batch;
pid_t log_start_pid;
bool log_multiple_pids;