block: implement blkdev_readpages

Doing a proper block dev ->readpages() speeds up the crazy dump(8) approach of using interleaved process IO. Signed-off-by: Jeff Moyer <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
mgowda · Apr 28, 2009 · db2dbb1 · db2dbb1
1 parent db29a6b
commit db2dbb1
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/fs/block_dev.c b/fs/block_dev.c
@@ -331,6 +331,12 @@ 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)
@@ -1399,6 +1405,7 @@ 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,