xfs: define a flags field for the AG geometry ioctl structure

Define a flags field for the AG geometry ioctl structure.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>

diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index 52d03a3..39dd2b9 100644 (file)
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -287,7 +287,7 @@ struct xfs_ag_geometry {
        uint32_t        ag_ifree;       /* o: inodes free */
        uint32_t        ag_sick;        /* o: sick things in ag */
        uint32_t        ag_checked;     /* o: checked metadata in ag */
-       uint32_t        ag_reserved32;  /* o: zero */
+       uint32_t        ag_flags;       /* i/o: flags for this ag */
        uint64_t        ag_reserved[12];/* o: zero */
 };
 #define XFS_AG_GEOM_SICK_SB    (1 << 0)  /* superblock */

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 9a6823e..c93501f 100644 (file)
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1038,6 +1038,10 @@ xfs_ioc_ag_geometry(
 
        if (copy_from_user(&ageo, arg, sizeof(ageo)))
                return -EFAULT;
+       if (ageo.ag_flags)
+               return -EINVAL;
+       if (memchr_inv(&ageo.ag_reserved, 0, sizeof(ageo.ag_reserved)))
+               return -EINVAL;
 
        error = xfs_ag_get_geometry(mp, ageo.ag_number, &ageo);
        if (error)