On 25.08.2017 00:12, Timofey Titovets wrote:
> At now while switch page bits in data ranges
> we always hande +1 page, for cover case
> where end of data range is not page aligned
>
> Let's handle that case more obvious and efficient
> Check end aligment directly and touch +1 page
> only then needed
>
> Signed-off-by: Timofey Titovets <nefelim...@gmail.com>
> ---
> fs/btrfs/extent_io.c | 12 ++++++++++--
> fs/btrfs/inode.c | 6 +++++-
> 2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
> index 98d85d2009f8..ccb66c1485e2 100644
> --- a/fs/btrfs/extent_io.c
> +++ b/fs/btrfs/extent_io.c
> @@ -1360,7 +1360,11 @@ void extent_range_clear_dirty_for_io(struct inode
> *inode, u64 start, u64 end)
> unsigned long end_index = end >> PAGE_SHIFT;
> struct page *page;
>
> - while (index <= end_index) {
> + /* Don't miss unaligned end */
> + if (end%PAGE_SIZE > 0)
> + end_index++;
if (!IS_ALIGNED(end, PAGE_SIZE)).
> +
> + while (index < end_index) {
> page = find_get_page(inode->i_mapping, index);
> BUG_ON(!page); /* Pages should be in the extent_io_tree */
> clear_page_dirty_for_io(page);
> @@ -1375,7 +1379,11 @@ void extent_range_redirty_for_io(struct inode *inode,
> u64 start, u64 end)
> unsigned long end_index = end >> PAGE_SHIFT;
> struct page *page;
>
> - while (index <= end_index) {
> + /* Don't miss unaligned end */
> + if (end%PAGE_SIZE > 0)
> + end_index++;
ditto
> +
> + while (index < end_index) {
> page = find_get_page(inode->i_mapping, index);
> BUG_ON(!page); /* Pages should be in the extent_io_tree */
> __set_page_dirty_nobuffers(page);
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index cb7779b08aaf..79feaea0fede 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -10745,7 +10745,11 @@ void btrfs_set_range_writeback(void *private_data,
> u64 start, u64 end)
> unsigned long end_index = end >> PAGE_SHIFT;
> struct page *page;
>
> - while (index <= end_index) {
> + /* Don't miss unaligned end */
> + if (end%PAGE_SIZE > 0)
> + end_index++;
Ditto
> +
> + while (index < end_index) {
> page = find_get_page(inode->i_mapping, index);
> ASSERT(page); /* Pages should be in the extent_io_tree */
> set_page_writeback(page);
> --
> 2.14.1
> --
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