[PATCH v3 01/12] ext4: Handle redirtying in ext4_bio_write_page()

Jan Kara
2022-12-05T12:29:33Z

Since we want to transition transaction commits to use ext4_writepages()
for writing back ordered, add handling of page redirtying into
ext4_bio_write_page(). Also move buffer dirty bit clearing into the same
place other buffer state handling.

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/ext4/page-io.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 97fa7b4c645f..4e68ace86f11 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -482,6 +482,13 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
/* A hole? We can safely clear the dirty bit */
if (!buffer_mapped(bh))
clear_buffer_dirty(bh);
+ /*
+ * Keeping dirty some buffer we cannot write? Make
+ * sure to redirty the page. This happens e.g. when
+ * doing writeout for transaction commit.
+ */
+ if (buffer_dirty(bh) && !PageDirty(page))
+ redirty_page_for_writepage(wbc, page);
if (io->io_bio)
ext4_io_submit(io);
continue;
@@ -489,6 +496,7 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
if (buffer_new(bh))
clear_buffer_new(bh);
set_buffer_async_write(bh);
+ clear_buffer_dirty(bh);
nr_to_submit++;
} while ((bh = bh->b_this_page) != head);

@@ -532,7 +540,10 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
printk_ratelimited(KERN_ERR "%s: ret = %d\n", __func__, ret);
redirty_page_for_writepage(wbc, page);
do {
- clear_buffer_async_write(bh);
+ if (buffer_async_write(bh)) {
+ clear_buffer_async_write(bh);
+ set_buffer_dirty(bh);
+ }
bh = bh->b_this_page;
} while (bh != head);
goto unlock;
@@ -546,7 +557,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
io_submit_add_bh(io, inode,
bounce_page ? bounce_page : page, bh);
nr_submitted++;
- clear_buffer_dirty(bh);
} while ((bh = bh->b_this_page) != head);

unlock:
--
2.35.3