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 06ff80c053403c05ed5f9f56c4a784b9bc884ff9..2ebea02780b8d80d12ca563a734d68a991303d86 100644 (file)
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -197,16 +197,15 @@ struct iomap_readpage_ctx {
 /**
  * iomap_read_inline_data - copy inline data into the page cache
  * @iter: iteration structure
- * @page: page to copy to
+ * @folio: folio to copy to
  *
- * Copy the inline data in @iter into @page and zero out the rest of the page.
+ * Copy the inline data in @iter into @folio and zero out the rest of the folio.
  * Only a single IOMAP_INLINE extent is allowed at the end of each file.
  * Returns zero for success to complete the read, or the usual negative errno.
  */
 static int 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;
@@ -214,7 +213,7 @@ static int 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 0;
 
        if (WARN_ON_ONCE(size > PAGE_SIZE - poff))
@@ -229,7 +228,7 @@ static int 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);
@@ -261,7 +260,7 @@ static loff_t iomap_readpage_iter(const struct iomap_iter *iter,
        sector_t sector;
 
        if (iomap->type == IOMAP_INLINE)
-               return iomap_read_inline_data(iter, page);
+               return iomap_read_inline_data(iter, folio);
 
        /* zero post-eof blocks as the page may be mapped */
        iop = iomap_page_create(iter->inode, folio);
@@ -597,10 +596,12 @@ 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);
+
        /* needs more work for the tailpacking case; disable for now */
        if (WARN_ON_ONCE(iomap_iter_srcmap(iter)->offset != 0))
                return -EIO;
-       return iomap_read_inline_data(iter, page);
+       return iomap_read_inline_data(iter, folio);
 }
 
 static int iomap_write_begin(const struct iomap_iter *iter, loff_t pos,