Btrfs: Add readpages support

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 90cb71d68294..d6d32465bc9a 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1748,7 +1748,6 @@ static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
         return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
 }
 
-
 static int btrfs_writepages(struct address_space *mapping,
                             struct writeback_control *wbc)
 {
@@ -1757,6 +1756,16 @@ static int btrfs_writepages(struct address_space *mapping,
         return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
 }
 
+static int
+btrfs_readpages(struct file *file, struct address_space *mapping,
+                struct list_head *pages, unsigned nr_pages)
+{
+        struct extent_map_tree *tree;
+        tree = &BTRFS_I(mapping->host)->extent_tree;
+        return extent_readpages(tree, mapping, pages, nr_pages,
+                                btrfs_get_extent);
+}
+
 static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
 {
         struct extent_map_tree *tree;
@@ -2537,6 +2546,7 @@ static struct address_space_operations btrfs_aops = {
         .readpage       = btrfs_readpage,
         .writepage      = btrfs_writepage,
         .writepages     = btrfs_writepages,
+        .readpages      = btrfs_readpages,
         .sync_page      = block_sync_page,
         .prepare_write  = btrfs_prepare_write,
         .commit_write   = btrfs_commit_write,