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Commit db2dbb12 authored by Jeff Moyer's avatar Jeff Moyer Committed by Jens Axboe
Browse files

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: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent db29a6b4

fs/block_dev.c

+7 −0
Original line number Diff line number Diff line
@@ -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,