Commit 449813515d3e ("block, fs: Restore the per-bio/request data
lifetime fields") restored write-hint support in ext4. But that is
applicable only for direct IO. This patch supports passing
write-hint for buffered IO from ext4 file system to block layer
by filling bi_write_hint of struct bio in io_submit_add_bh().
Signed-off-by: Jing Xia <j.xia@xxxxxxxxxxx>
---
fs/ext4/page-io.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index ad5543866d21..bb8b17c394d4 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -417,8 +417,10 @@ static void io_submit_add_bh(struct ext4_io_submit *io,
submit_and_retry:
ext4_io_submit(io);
}
- if (io->io_bio == NULL)
+ if (io->io_bio == NULL) {
io_submit_init_bio(io, bh);
+ io->io_bio->bi_write_hint = inode->i_write_hint;
+ }
if (!bio_add_folio(io->io_bio, io_folio, bh->b_size, bh_offset(bh)))
goto submit_and_retry;
wbc_account_cgroup_owner(io->io_wbc, &folio->page, bh->b_size);
--
2.34.1
