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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>
This commit is contained in:
Darrick J. Wong 2021-12-22 14:19:18 -08:00
parent 2585cf9dfa
commit 983d8e60f5
1 changed files with 2 additions and 1 deletions
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3
fs/xfs/xfs_ioctl.c
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@ -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;
}