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btrfs: cleanup calculation of lockend in lock_and_cleanup_extent_if_need() 

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.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2020-08-13 14:33:52 +08:00 committed by David Sterba
parent c4923027bd
commit e21139c621
1 changed files with 1 additions and 3 deletions
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4
fs/btrfs/file.c
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@ -1477,9 +1477,7 @@ 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;