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| author | Dave Chinner <dchinner@redhat.com> | 2010-08-24 12:02:11 +1000 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2010-10-18 15:07:25 -0500 |
| commit | 447223520520b17d3b6d0631aa4838fbaf8eddb4 (patch) | |
| tree | 068716a0537e0f7007a037073c4b7bc608233c1e /fs/xfs/xfs_fs.h | |
| parent | 3ae4c9deb30a8d5ee305b461625dcb298c9804a9 (diff) | |
| download | linux-447223520520b17d3b6d0631aa4838fbaf8eddb4.tar.gz | |
xfs: Introduce XFS_IOC_ZERO_RANGE
XFS_IOC_ZERO_RANGE is the equivalent of an atomic XFS_IOC_UNRESVSP/ XFS_IOC_RESVSP call pair. It enabled ranges of written data to be turned into zeroes without requiring IO or having to free and reallocate the extents in the range given as would occur if we had to punch and then preallocate them separately. This enables applications to zero parts of files very quickly without changing the layout of the files in any way. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_fs.h')
| -rw-r--r-- | fs/xfs/xfs_fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/xfs_fs.h b/fs/xfs/xfs_fs.h index 87c2e9d02288..10f6093671b0 100644 --- a/fs/xfs/xfs_fs.h +++ b/fs/xfs/xfs_fs.h @@ -448,6 +448,7 @@ typedef struct xfs_handle { /* XFS_IOC_SETBIOSIZE ---- deprecated 46 */ /* XFS_IOC_GETBIOSIZE ---- deprecated 47 */ #define XFS_IOC_GETBMAPX _IOWR('X', 56, struct getbmap) +#define XFS_IOC_ZERO_RANGE _IOW ('X', 57, struct xfs_flock64) /* * ioctl commands that replace IRIX syssgi()'s |