Commit 813f8536 authored by j.xia's avatar j.xia Committed by Theodore Ts'o
Browse files

ext4: pass write-hint for buffered IO 



Commit 44981351 ("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: default avatarj.xia <j.xia@samsung.com>
Link: https://patch.msgid.link/20240919020341.2657646-1-j.xia@samsung.com


Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent 2f3d93e2

fs/ext4/page-io.c

+3 −1
Original line number Diff line number Diff line
@@ -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);