ntfs: skip reads for full compression unit overwrites

ntfs_compress_write() reads every page in a compression unit before copying
new data into it. The read is unnecessary when an aligned write replaces
every byte covered by the page-cache folios.

Detect full page-aligned compression unit overwrites and grab locked cache
folios without reading them. Keep the read-modify-write path for partial
units and units that cover only part of a large page.

Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions