[PATCH] fatfs: switch write_lock to read_lock in fat_ioctl_get_attributes

[fengyubo]

From: Yubo Feng <fengyu...@huawei.com>

There is no necessery to hold write_lock in fat_ioctl_get_attributes.
write_lock may make an impact on concurrency of fat_ioctl_get_attributes.

Signed-off-by: Yubo Feng <fengyu...@huawei.com>
---
 fs/fat/file.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 42134c5..f9ee27c 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -25,9 +25,9 @@ static int fat_ioctl_get_attributes(struct inode *inode, u32 
__user *user_attr)
 {
        u32 attr;
 
-       inode_lock(inode);
+       inode_lock_shared(inode);
        attr = fat_make_attrs(inode);
-       inode_unlock(inode);
+       inode_unlock_shared(inode);
 
        return put_user(attr, user_attr);
 }
-- 
2.7.4