diff options
| author | Dave Chinner <dchinner@redhat.com> | 2010-08-23 22:02:11 -0400 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2010-10-18 16:07:25 -0400 |
| commit | 447223520520b17d3b6d0631aa4838fbaf8eddb4 (patch) | |
| tree | 068716a0537e0f7007a037073c4b7bc608233c1e /fs/xfs/linux-2.6/xfs_ioctl32.c | |
| parent | 3ae4c9deb30a8d5ee305b461625dcb298c9804a9 (diff) | |
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/linux-2.6/xfs_ioctl32.c')
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_ioctl32.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c index 6c83f7f62dc9..464bcc76e980 100644 --- a/fs/xfs/linux-2.6/xfs_ioctl32.c +++ b/fs/xfs/linux-2.6/xfs_ioctl32.c | |||
| @@ -574,6 +574,7 @@ xfs_file_compat_ioctl( | |||
| 574 | case XFS_IOC_FSGEOMETRY_V1: | 574 | case XFS_IOC_FSGEOMETRY_V1: |
| 575 | case XFS_IOC_FSGROWFSDATA: | 575 | case XFS_IOC_FSGROWFSDATA: |
| 576 | case XFS_IOC_FSGROWFSRT: | 576 | case XFS_IOC_FSGROWFSRT: |
| 577 | case XFS_IOC_ZERO_RANGE: | ||
| 577 | return xfs_file_ioctl(filp, cmd, p); | 578 | return xfs_file_ioctl(filp, cmd, p); |
| 578 | #else | 579 | #else |
| 579 | case XFS_IOC_ALLOCSP_32: | 580 | case XFS_IOC_ALLOCSP_32: |