[PATCH] btrfs: cleanup how we calculate lockend in lock_and_cleanup_extent_if_need()

Qu Wenruo
2020-08-13T06:34:22Z

We're just doing rounding up to sectorsize to calculate the lockend.

There is no need to do the unnecessary length calculation, just direct
round_up() is enough.

Signed-off-by: Qu Wenruo <wqu@suse.com>
---
fs/btrfs/file.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 2f96f083eb8c..c71ea9e5c529 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1475,9 +1475,7 @@ lock_and_cleanup_extent_if_need(struct btrfs_inode *inode, struct page **pages,
int ret = 0;

start_pos = round_down(pos, fs_info->sectorsize);
- last_pos = start_pos
- + round_up(pos + write_bytes - start_pos,
- fs_info->sectorsize) - 1;
+ last_pos = round_up(pos + write_bytes, fs_info->sectorsize) - 1;

if (start_pos < inode->vfs_inode.i_size) {
struct btrfs_ordered_extent *ordered;
--
2.28.0