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Subject[PATCH] fs/buffer: adjust the order of might_sleep() in __getblk_gfp()
Date
From: Gou Hao <gouhao@uniontech.com>

If 'bh' is found in cache, just return directly.
might_sleep() is only required on slow paths.

Signed-off-by: Gou Hao <gouhao@uniontech.com>
---
fs/buffer.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 9e1e2add541e..e13eff504fb5 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1371,10 +1371,11 @@ __getblk_gfp(struct block_device *bdev, sector_t block,
{
struct buffer_head *bh = __find_get_block(bdev, block, size);

+ if (bh)
+ return bh;
+
might_sleep();
- if (bh == NULL)
- bh = __getblk_slow(bdev, block, size, gfp);
- return bh;
+ return __getblk_slow(bdev, block, size, gfp);
}
EXPORT_SYMBOL(__getblk_gfp);

--
2.20.1
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