[PATCH v5 1/9] iomap: Add iomap_put_folio helper

Andreas Gruenbacher
2022-12-31T15:10:20Z

Add an iomap_put_folio() helper to encapsulate unlocking the folio,
calling ->page_done(), and putting the folio. Use the new helper in
iomap_write_begin() and iomap_write_end().

This effectively doesn't change the way the code works, but prepares for
successive improvements.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
fs/iomap/buffered-io.c | 29 +++++++++++++++++------------
1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 356193e44cf0..c30d150a9303 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -575,6 +575,19 @@ static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
return 0;
}

+static void iomap_put_folio(struct iomap_iter *iter, loff_t pos, size_t ret,
+ struct folio *folio)
+{
+ const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
+
+ if (folio)
+ folio_unlock(folio);
+ if (page_ops && page_ops->page_done)
+ page_ops->page_done(iter->inode, pos, ret, &folio->page);
+ if (folio)
+ folio_put(folio);
+}
+
static int iomap_write_begin_inline(const struct iomap_iter *iter,
struct folio *folio)
{
@@ -616,7 +629,8 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos,
fgp, mapping_gfp_mask(iter->inode->i_mapping));
if (!folio) {
status = (iter->flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOMEM;
- goto out_no_page;
+ iomap_put_folio(iter, pos, 0, NULL);
+ return status;
}

/*
@@ -656,13 +670,9 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos,
return 0;

out_unlock:
- folio_unlock(folio);
- folio_put(folio);
+ iomap_put_folio(iter, pos, 0, folio);
iomap_write_failed(iter->inode, pos, len);

-out_no_page:
- if (page_ops && page_ops->page_done)
- page_ops->page_done(iter->inode, pos, 0, NULL);
return status;
}

@@ -712,7 +722,6 @@ static size_t iomap_write_end_inline(const struct iomap_iter *iter,
static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
size_t copied, struct folio *folio)
{
- const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
const struct iomap *srcmap = iomap_iter_srcmap(iter);
loff_t old_size = iter->inode->i_size;
size_t ret;
@@ -735,14 +744,10 @@ static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
i_size_write(iter->inode, pos + ret);
iter->iomap.flags |= IOMAP_F_SIZE_CHANGED;
}
- folio_unlock(folio);
+ iomap_put_folio(iter, pos, ret, folio);

if (old_size < pos)
pagecache_isize_extended(iter->inode, old_size, pos);
- if (page_ops && page_ops->page_done)
- page_ops->page_done(iter->inode, pos, ret, &folio->page);
- folio_put(folio);
-
if (ret < len)
iomap_write_failed(iter->inode, pos + ret, len - ret);
return ret;
--
2.38.1