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fs: support DAX based iomap zeroing

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

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-06-21 09:31:39 +10:00 committed by Dave Chinner
parent ae259a9c85
commit 9a286f0e52
1 changed files with 14 additions and 1 deletions
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15
fs/iomap.c
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@ -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)
@ -286,7 +296,10 @@ 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);
status = iomap_zero(inode, pos, offset, bytes, iomap);
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;