Revert "block: implement blkdev_readpages"

This reverts commit db2dbb12dc47a50c7a4c5678f526014063e486f6.

It apparently causes problems with partition table read-ahead
on archs with large page sizes. Until that problem is diagnosed
further, just drop the readpages support on block devices.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/fs/block_dev.c b/fs/block_dev.c
index a29b4dc..2dfc6cd 100644 (file)
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -331,12 +331,6 @@ static int blkdev_readpage(struct file * file, struct page * page)
        return block_read_full_page(page, blkdev_get_block);
 }
 
-static int blkdev_readpages(struct file *file, struct address_space *mapping,
-                       struct list_head *pages, unsigned nr_pages)
-{
-       return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block);
-}
-
 static int blkdev_write_begin(struct file *file, struct address_space *mapping,
                        loff_t pos, unsigned len, unsigned flags,
                        struct page **pagep, void **fsdata)
@@ -1405,7 +1399,6 @@ static int blkdev_releasepage(struct page *page, gfp_t wait)
 
 static const struct address_space_operations def_blk_aops = {
        .readpage       = blkdev_readpage,
-       .readpages      = blkdev_readpages,
        .writepage      = blkdev_writepage,
        .sync_page      = block_sync_page,
        .write_begin    = blkdev_write_begin,