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block: implement blkdev_readpages

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Doing a proper block dev ->readpages() speeds up the crazy dump(8)
approach of using interleaved process IO.

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jeff Moyer 2009-04-22 14:08:13 +02:00 committed by Jens Axboe
parent db29a6b496
commit db2dbb12dc
1 changed files with 7 additions and 0 deletions
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7
fs/block_dev.c
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@ -331,6 +331,12 @@ static int blkdev_readpage(struct file * file, struct page * page)
return block_read_full_page(page, blkdev_get_block); 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, static int blkdev_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags, loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata) 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 = { static const struct address_space_operations def_blk_aops = {
.readpage = blkdev_readpage, .readpage = blkdev_readpage,
.readpages = blkdev_readpages,
.writepage = blkdev_writepage, .writepage = blkdev_writepage,
.sync_page = block_sync_page, .sync_page = block_sync_page,
.write_begin = blkdev_write_begin, .write_begin = blkdev_write_begin,