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ext4: pass write-hint for buffered IO

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Commit 449813515d ("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: j.xia <j.xia@samsung.com>
Link: https://patch.msgid.link/20240919020341.2657646-1-j.xia@samsung.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
j.xia 2024-09-19 10:03:41 +08:00 committed by Theodore Ts'o
parent 2f3d93e210
commit 813f853604
1 changed files with 3 additions and 1 deletions
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4
fs/ext4/page-io.c
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@ -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);