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ext4: Move page unlocking out of mpage_submit_page()

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Move page unlocking during page writeback out of mpage_submit_page()
into the callers. This will allow writeback in data=journal mode to keep
the page locked for a bit longer. Since page unlocking it tightly
connected to increment of mpd->first_page (as that determines cleanup of
locked but unwritten pages), move page unlocking as well as
mpd->first_page handling into a helper function.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Link: https://lore.kernel.org/r/20230228051319.4085470-6-tytso@mit.edu
This commit is contained in:
Jan Kara
2023-02-28 00:13:17 -05:00
committed by Theodore Ts'o
parent f1496362e9
commit eaf2ca10ca
1 changed files with 12 additions and 9 deletions
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21
fs/ext4/inode.c
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@@ -2083,6 +2083,12 @@ static int ext4_writepage(struct page *page,
return ret;
}
static void mpage_page_done(struct mpage_da_data *mpd, struct page *page)
{
mpd->first_page++;
unlock_page(page);
}
static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
{
int len;
@@ -2111,10 +2117,8 @@ static int mpage_submit_page(struct mpage_da_data *mpd, struct page *page)
else
len = PAGE_SIZE;
err = ext4_bio_write_page(&mpd->io_submit, page, len);
unlock_page(page);
if (!err)
mpd->wbc->nr_to_write--;
mpd->first_page++;
return err;
}
@@ -2226,6 +2230,7 @@ static int mpage_process_page_bufs(struct mpage_da_data *mpd,
/* So far everything mapped? Submit the page for IO. */
if (mpd->map.m_len == 0) {
err = mpage_submit_page(mpd, head->b_page);
mpage_page_done(mpd, head->b_page);
if (err < 0)
return err;
}
@@ -2357,6 +2362,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
goto out;
/* Page fully mapped - let IO run! */
err = mpage_submit_page(mpd, page);
mpage_page_done(mpd, page);
if (err < 0)
goto out;
}
@@ -2666,14 +2672,11 @@ static int mpage_prepare_extent_to_map(struct mpage_da_data *mpd)
* modify metadata is simple. Just submit the page.
*/
if (!mpd->can_map) {
if (ext4_page_nomap_can_writeout(&folio->page)) {
if (ext4_page_nomap_can_writeout(&folio->page))
err = mpage_submit_page(mpd, &folio->page);
if (err < 0)
goto out;
} else {
folio_unlock(folio);
mpd->first_page += folio_nr_pages(folio);
}
mpage_page_done(mpd, &folio->page);
if (err < 0)
goto out;
} else {
/* Add all dirty buffers to mpd */
lblk = ((ext4_lblk_t)folio->index) <<