[PATCH v15 10/17] iomap: Convert bio completions to use folios

Matthew Wilcox (Oracle)
2021-07-19T22:23:48Z

Use bio_for_each_folio() to iterate over each folio in the bio
instead of iterating over each page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
fs/iomap/buffered-io.c | 46 +++++++++++++++++-------------------------
1 file changed, 18 insertions(+), 28 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 0f70bd185c2a..ee33a4e7b946 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -161,36 +161,29 @@ static void iomap_set_range_uptodate(struct folio *folio,
folio_mark_uptodate(folio);
}

-static void
-iomap_read_page_end_io(struct bio_vec *bvec, int error)
+static void iomap_finish_folio_read(struct folio *folio, size_t offset,
+ size_t len, int error)
{
- struct page *page = bvec->bv_page;
- struct folio *folio = page_folio(page);
struct iomap_page *iop = to_iomap_page(folio);

if (unlikely(error)) {
folio_clear_uptodate(folio);
folio_set_error(folio);
} else {
- size_t off = (page - &folio->page) * PAGE_SIZE +
- bvec->bv_offset;
-
- iomap_set_range_uptodate(folio, iop, off, bvec->bv_len);
+ iomap_set_range_uptodate(folio, iop, offset, len);
}

- if (!iop || atomic_sub_and_test(bvec->bv_len, &iop->read_bytes_pending))
+ if (!iop || atomic_sub_and_test(len, &iop->read_bytes_pending))
folio_unlock(folio);
}

-static void
-iomap_read_end_io(struct bio *bio)
+static void iomap_read_end_io(struct bio *bio)
{
int error = blk_status_to_errno(bio->bi_status);
- struct bio_vec *bvec;
- struct bvec_iter_all iter_all;
+ struct folio_iter fi;

- bio_for_each_segment_all(bvec, bio, iter_all)
- iomap_read_page_end_io(bvec, error);
+ bio_for_each_folio_all(fi, bio)
+ iomap_finish_folio_read(fi.folio, fi.offset, fi.length, error);
bio_put(bio);
}

@@ -1014,23 +1007,21 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
}
EXPORT_SYMBOL_GPL(iomap_page_mkwrite);

-static void
-iomap_finish_page_writeback(struct inode *inode, struct page *page,
- int error, unsigned int len)
+static void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
+ size_t len, int error)
{
- struct folio *folio = page_folio(page);
struct iomap_page *iop = to_iomap_page(folio);

if (error) {
- SetPageError(page);
+ folio_set_error(folio);
mapping_set_error(inode->i_mapping, -EIO);
}

- WARN_ON_ONCE(i_blocks_per_page(inode, page) > 1 && !iop);
+ WARN_ON_ONCE(i_blocks_per_folio(inode, folio) > 1 && !iop);
WARN_ON_ONCE(iop && atomic_read(&iop->write_bytes_pending) <= 0);

if (!iop || atomic_sub_and_test(len, &iop->write_bytes_pending))
- end_page_writeback(page);
+ folio_end_writeback(folio);
}

/*
@@ -1049,8 +1040,7 @@ iomap_finish_ioend(struct iomap_ioend *ioend, int error)
bool quiet = bio_flagged(bio, BIO_QUIET);

for (bio = &ioend->io_inline_bio; bio; bio = next) {
- struct bio_vec *bv;
- struct bvec_iter_all iter_all;
+ struct folio_iter fi;

/*
* For the last bio, bi_private points to the ioend, so we
@@ -1061,10 +1051,10 @@ iomap_finish_ioend(struct iomap_ioend *ioend, int error)
else
next = bio->bi_private;

- /* walk each page on bio, ending page IO on them */
- bio_for_each_segment_all(bv, bio, iter_all)
- iomap_finish_page_writeback(inode, bv->bv_page, error,
- bv->bv_len);
+ /* walk all folios in bio, ending page IO on them */
+ bio_for_each_folio_all(fi, bio)
+ iomap_finish_folio_write(inode, fi.folio, fi.length,
+ error);
bio_put(bio);
}
/* The ioend has been freed by bio_put() */
--
2.30.2