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Commit 9a286f0e authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Dave Chinner
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fs: support DAX based iomap zeroing 



This avoid needing a separate inefficient get_block based DAX zero_range
implementation in file systems.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarDave Chinner <dchinner@redhat.com>
Signed-off-by: default avatarDave Chinner <david@fromorbit.com>
parent ae259a9c

fs/iomap.c

+14 −1
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/uio.h>

#include <linux/backing-dev.h>

#include <linux/buffer_head.h>

#include <linux/dax.h>

#include "internal.h"



typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
@@ -268,6 +269,15 @@ static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset, 
	return iomap_write_end(inode, pos, bytes, bytes, page);

}



static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,

		struct iomap *iomap)

{

	sector_t sector = iomap->blkno +

		(((pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9);



	return __dax_zero_page_range(iomap->bdev, sector, offset, bytes);

}



static loff_t

iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,

		void *data, struct iomap *iomap)
@@ -286,6 +296,9 @@ iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count, 
		offset = pos & (PAGE_SIZE - 1); /* Within page */

		bytes = min_t(unsigned, PAGE_SIZE - offset, count);



		if (IS_DAX(inode))

			status = iomap_dax_zero(pos, offset, bytes, iomap);

		else

			status = iomap_zero(inode, pos, offset, bytes, iomap);

		if (status < 0)

			return status;