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xfs: disable xfs_ioc_space for always COW inodes 

If we always have to write out of place preallocating blocks is
pointless.  We already check for this in the normal falloc path, but
the check was missig in the legacy ALLOCSP path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-10-24 22:26:27 -07:00 committed by Darrick J. Wong
parent 837a6e7f5c
commit 7a42c70ea0
1 changed files with 4 additions and 0 deletions
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4
fs/xfs/xfs_ioctl.c
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@ -33,6 +33,7 @@
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_health.h"
#include "xfs_reflink.h"
#include <linux/mount.h>
#include <linux/namei.h>
@ -606,6 +607,9 @@ xfs_ioc_space(
if (!S_ISREG(inode->i_mode))
return -EINVAL;
if (xfs_is_always_cow_inode(ip))
return -EOPNOTSUPP;
if (filp->f_flags & O_DSYNC)
flags |= XFS_PREALLOC_SYNC;
if (filp->f_mode & FMODE_NOCMTIME)