[PATCH 12/21] iomap: Convert iomap_read_inline_data to take a folio

Matthew Wilcox (Oracle)
2021-11-01T21:03:02Z

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>
---
fs/iomap/buffered-io.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index dea577380215..b5e77d9de4a7 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);
@@ -587,12 +586,13 @@ 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;
--
2.33.0