[PATCH] xfs/log: protect xc_cil in xlog_cil_push()

[Pingfan Liu <kernelfans@xxxxxxxxx>]

xlog_cil_push() is the reader and writer of xc_cil, and should be protected
against xlog_cil_insert_items().

Signed-off-by: Pingfan Liu <kernelfans@xxxxxxxxx>
Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
To: linux-xfs@xxxxxxxxxxxxxxx
Cc: linux-fsdevel@xxxxxxxxxxxxxxx
---
 fs/xfs/xfs_log_cil.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index ef652abd..004af09 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -723,6 +723,7 @@ xlog_cil_push(
 	 */
 	lv = NULL;
 	num_iovecs = 0;
+	spin_lock(&cil->xc_cil_lock);
 	while (!list_empty(&cil->xc_cil)) {
 		struct xfs_log_item	*item;
 
@@ -737,6 +738,7 @@ xlog_cil_push(
 		item->li_lv = NULL;
 		num_iovecs += lv->lv_niovecs;
 	}
+	spin_unlock(&cil->xc_cil_lock);
 
 	/*
 	 * initialise the new context and attach it to the CIL. Then attach
-- 
2.7.5