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Message-Id: <20221207112722.22220-1-jack@suse.cz> Date: Wed, 7 Dec 2022 12:27:04 +0100 From: Jan Kara <jack@...e.cz> To: Ted Tso <tytso@....edu> Cc: <linux-ext4@...r.kernel.org>, Christoph Hellwig <hch@...radead.org>, "Ritesh Harjani (IBM)" <ritesh.list@...il.com>, Jan Kara <jack@...e.cz> Subject: [PATCH v4 01/13] ext4: Handle redirtying in ext4_bio_write_page() 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@...il.com> Signed-off-by: Jan Kara <jack@...e.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
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