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ext4: make the writeback path support large folios

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In mpage_map_and_submit_buffers(), the 'lblk' is now aligned to
PAGE_SIZE. Convert it to be aligned to folio size. Additionally, modify
the wbc->nr_to_write update to reduce the number of pages in a single
folio, ensuring that the entire writeback path can support large folios.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Link: https://patch.msgid.link/20250512063319.3539411-7-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2025-05-12 14:33:17 +08:00 committed by Theodore Ts'o
parent 0e32d86170
commit cd9f76de6a
1 changed files with 3 additions and 3 deletions
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6
fs/ext4/inode.c
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@ -1983,7 +1983,7 @@ static int mpage_submit_folio(struct mpage_da_data *mpd, struct folio *folio)
len = size & (len - 1);
err = ext4_bio_write_folio(&mpd->io_submit, folio, len);
if (!err)
mpd->wbc->nr_to_write--;
mpd->wbc->nr_to_write -= folio_nr_pages(folio);
return err;
}
@ -2206,7 +2206,6 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
start = mpd->map.m_lblk >> bpp_bits;
end = (mpd->map.m_lblk + mpd->map.m_len - 1) >> bpp_bits;
lblk = start << bpp_bits;
pblock = mpd->map.m_pblk;
folio_batch_init(&fbatch);
@ -2217,6 +2216,7 @@ static int mpage_map_and_submit_buffers(struct mpage_da_data *mpd)
for (i = 0; i < nr; i++) {
struct folio *folio = fbatch.folios[i];
lblk = folio->index << bpp_bits;
err = mpage_process_folio(mpd, folio, &lblk, &pblock,
&map_bh);
/*
@ -2442,7 +2442,7 @@ static int mpage_journal_page_buffers(handle_t *handle,
size_t len = folio_size(folio);
folio_clear_checked(folio);
mpd->wbc->nr_to_write--;
mpd->wbc->nr_to_write -= folio_nr_pages(folio);
if (folio_pos(folio) + len > size &&
!ext4_verity_in_progress(inode))