xfs: map unwritten blocks in XFS_IOC_{ALLOC,FREE}SP just like fallocate

The old ALLOCSP/FREESP ioctls in XFS can be used to preallocate space at
the end of files, just like fallocate and RESVSP.  Make the behavior
consistent with the other ioctls.

Reported-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 174cd89..bc85e04 100644 (file)
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -687,7 +687,8 @@ xfs_ioc_space(
 
        if (bf->l_start > XFS_ISIZE(ip)) {
                error = xfs_alloc_file_space(ip, XFS_ISIZE(ip),
-                               bf->l_start - XFS_ISIZE(ip), 0);
+                               bf->l_start - XFS_ISIZE(ip),
+                               XFS_BMAPI_PREALLOC);
                if (error)
                        goto out_unlock;
        }