[PATCH] Btrfs: remove warning check in io_ctl_map_page

[shhuiw@gmail.com]

From: Wang Sheng-Hui <shhuiw@gmail.com>

io_ctl_map_page is called by many functions in free-space-cache.
In some scenarios, the ->cur is not null, e.g. io_ctl_add_entry.
Remove the check here.

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
---
 fs/btrfs/free-space-cache.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index c3318cb..4ea66d4 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -307,7 +307,6 @@ static void io_ctl_unmap_page(struct io_ctl *io_ctl)
 
 static void io_ctl_map_page(struct io_ctl *io_ctl, int clear)
 {
-	WARN_ON(io_ctl->cur);
 	BUG_ON(io_ctl->index >= io_ctl->num_pages);
 	io_ctl->page = io_ctl->pages[io_ctl->index++];
 	io_ctl->cur = kmap(io_ctl->page);
-- 
1.6.0.2