ext4 crypto: add ext4_mpage_readpages()

This takes code from fs/mpage.c and optimizes it for ext4.  Its
primary reason is to allow us to more easily add encryption to ext4's
read path in an efficient manner.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ff0c111e52eb..cd3009152ae2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2820,7 +2820,7 @@ static int ext4_readpage(struct file *file, struct page *page)
                 ret = ext4_readpage_inline(inode, page);
 
         if (ret == -EAGAIN)
-                return mpage_readpage(page, ext4_get_block);
+                return ext4_mpage_readpages(page->mapping, NULL, page, 1);
 
         return ret;
 }
@@ -2835,7 +2835,7 @@ ext4_readpages(struct file *file, struct address_space *mapping,
         if (ext4_has_inline_data(inode))
                 return 0;
 
-        return mpage_readpages(mapping, pages, nr_pages, ext4_get_block);
+        return ext4_mpage_readpages(mapping, pages, NULL, nr_pages);
 }
 
 static void ext4_invalidatepage(struct page *page, unsigned int offset,