From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Sat, 24 Jul 2021 03:24:50 +0000 (-0400)
Subject: iomap: Convert iomap_read_inline_data to take a folio
X-Git-Tag: iomap-folio-5.17-old~12
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=9cd04ded32e5fa7c25e1f1b47cd5c65f4d0c1f54;p=users%2Fwilly%2Flinux.git

iomap: Convert iomap_read_inline_data to take a folio

We still only support up to a single page of inline data (at least,
per call to iomap_read_inline_data()), but it can now be written into
the middle of a folio in case we decide to allocate a 16KiB page for
a file that's 8.1KiB in size.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index c7c4ae735620..96a404f11a3b 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -195,9 +195,8 @@ struct iomap_readpage_ctx {
 };
 
 static loff_t iomap_read_inline_data(const struct iomap_iter *iter,
-		struct page *page)
+		struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct iomap_page *iop;
 	const struct iomap *iomap = iomap_iter_srcmap(iter);
 	size_t size = i_size_read(iter->inode) - iomap->offset;
@@ -205,7 +204,7 @@ static loff_t iomap_read_inline_data(const struct iomap_iter *iter,
 	size_t offset = offset_in_folio(folio, iomap->offset);
 	void *addr;
 
-	if (PageUptodate(page))
+	if (folio_test_uptodate(folio))
 		return PAGE_SIZE - poff;
 
 	if (WARN_ON_ONCE(size > PAGE_SIZE - poff))
@@ -220,7 +219,7 @@ static loff_t iomap_read_inline_data(const struct iomap_iter *iter,
 	else
 		iop = to_iomap_page(folio);
 
-	addr = kmap_local_page(page) + poff;
+	addr = kmap_local_folio(folio, offset);
 	memcpy(addr, iomap->inline_data, size);
 	memset(addr + size, 0, PAGE_SIZE - poff - size);
 	kunmap_local(addr);
@@ -252,7 +251,7 @@ static loff_t iomap_readpage_iter(const struct iomap_iter *iter,
 	sector_t sector;
 
 	if (iomap->type == IOMAP_INLINE)
-		return min(iomap_read_inline_data(iter, page), length);
+		return min(iomap_read_inline_data(iter, folio), length);
 
 	/* zero post-eof blocks as the page may be mapped */
 	iop = iomap_page_create(iter->inode, folio);
@@ -586,12 +585,13 @@ static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
 static int iomap_write_begin_inline(const struct iomap_iter *iter,
 		struct page *page)
 {
+	struct folio *folio = page_folio(page);
 	int ret;
 
 	/* needs more work for the tailpacking case; disable for now */
 	if (WARN_ON_ONCE(iomap_iter_srcmap(iter)->offset != 0))
 		return -EIO;
-	ret = iomap_read_inline_data(iter, page);
+	ret = iomap_read_inline_data(iter, folio);
 	if (ret < 0)
 		return ret;
 	return 0;