[PATCH 14/21] iomap: Convert iomap_page_mkwrite to use a folio

Matthew Wilcox (Oracle)
2021-11-01T21:06:07Z

If we write to any page in a folio, we have to mark the entire
folio as dirty, and potentially COW the entire folio, because it'll
all get written back as one unit.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
---
fs/iomap/buffered-io.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 3c68ff26cd16..b55d947867b1 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -959,21 +959,21 @@ iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
}
EXPORT_SYMBOL_GPL(iomap_truncate_page);

-static loff_t iomap_page_mkwrite_iter(struct iomap_iter *iter,
- struct page *page)
+static loff_t iomap_folio_mkwrite_iter(struct iomap_iter *iter,
+ struct folio *folio)
{
loff_t length = iomap_length(iter);
int ret;

if (iter->iomap.flags & IOMAP_F_BUFFER_HEAD) {
- ret = __block_write_begin_int(page, iter->pos, length, NULL,
- &iter->iomap);
+ ret = __block_write_begin_int(&folio->page, iter->pos, length,
+ NULL, &iter->iomap);
if (ret)
return ret;
- block_commit_write(page, 0, length);
+ block_commit_write(&folio->page, 0, length);
} else {
- WARN_ON_ONCE(!PageUptodate(page));
- set_page_dirty(page);
+ WARN_ON_ONCE(!folio_test_uptodate(folio));
+ folio_mark_dirty(folio);
}

return length;
@@ -985,24 +985,24 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
.inode = file_inode(vmf->vma->vm_file),
.flags = IOMAP_WRITE | IOMAP_FAULT,
};
- struct page *page = vmf->page;
+ struct folio *folio = page_folio(vmf->page);
ssize_t ret;

- lock_page(page);
- ret = page_mkwrite_check_truncate(page, iter.inode);
+ folio_lock(folio);
+ ret = folio_mkwrite_check_truncate(folio, iter.inode);
if (ret < 0)
goto out_unlock;
- iter.pos = page_offset(page);
+ iter.pos = folio_pos(folio);
iter.len = ret;
while ((ret = iomap_iter(&iter, ops)) > 0)
- iter.processed = iomap_page_mkwrite_iter(&iter, page);
+ iter.processed = iomap_folio_mkwrite_iter(&iter, folio);

if (ret < 0)
goto out_unlock;
- wait_for_stable_page(page);
+ folio_wait_stable(folio);
return VM_FAULT_LOCKED;
out_unlock:
- unlock_page(page);
+ folio_unlock(folio);
return block_page_mkwrite_return(ret);
}
EXPORT_SYMBOL_GPL(iomap_page_mkwrite);
--
2.33.0