[PATCH 18/34] xfs: use iomap for blocksize == PAGE_SIZE readpage and readpages

[Christoph Hellwig]

For file systems with a block size that equals the page size we never do
partial reads, so we can use the buffer_head-less iomap versions of
readpage and readpages without conflicting with the buffer_head structures
create later in write_begin.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/xfs/xfs_aops.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 56e405572909..c631c457b444 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -1402,6 +1402,8 @@ xfs_vm_readpage(
        struct page             *page)
 {
        trace_xfs_vm_readpage(page->mapping->host, 1);
+       if (i_blocksize(page->mapping->host) == PAGE_SIZE)
+               return iomap_readpage(page, &xfs_iomap_ops);
        return mpage_readpage(page, xfs_get_blocks);
 }
 
@@ -1413,6 +1415,8 @@ xfs_vm_readpages(
        unsigned                nr_pages)
 {
        trace_xfs_vm_readpages(mapping->host, nr_pages);
+       if (i_blocksize(mapping->host) == PAGE_SIZE)
+               return iomap_readpages(mapping, pages, nr_pages, 
&xfs_iomap_ops);
        return mpage_readpages(mapping, pages, nr_pages, xfs_get_blocks);
 }
 
-- 
2.17.0