Currently if we write to [2k, 6k] where pos is 2k and end is 6k,
get_block() will be called twice, but we can save one get_block
by sending two blocks together to get_block.
Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
---
fs/dax.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/dax.c b/fs/dax.c
index 53eb6a0..8d4bd5f 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -172,7 +172,7 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter,
long size;
if (pos == bh_max) {
- bh->b_size = PAGE_ALIGN(end - pos);
+ bh->b_size = PAGE_ALIGN(end - (pos - first));
bh->b_state = 0;
rc = get_block(inode, block, bh, rw == WRITE);
if (rc)
--
2.5.5
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