diff options
| author |   Christoph Hellwig <hch@lst.de> | 2016-06-21 09:31:39 +1000 |
|---|---|---|
| committer |   Dave Chinner <david@fromorbit.com> | 2016-06-21 09:31:39 +1000 |
| commit | 9a286f0e52a2dac362caf78a458efa8f3c05b99e (patch) | |
| tree | c723e9b64861d04d0bf846fd6a6bad3284aa5958 /fs/iomap.c | |
| parent | fs: introduce iomap infrastructure (diff) | |
| download | wireguard-linux-9a286f0e52a2dac362caf78a458efa8f3c05b99e.tar.xz wireguard-linux-9a286f0e52a2dac362caf78a458efa8f3c05b99e.zip | |
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: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/iomap.c')
| -rw-r--r-- | fs/iomap.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/fs/iomap.c b/fs/iomap.c index 8e2fc17c266f..477817c00bac 100644 --- a/fs/iomap.c +++ b/fs/iomap.c @@ -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; |