Author: kib
Date: Tue Apr  2 13:41:26 2019
New Revision: 345799
URL: https://svnweb.freebsd.org/changeset/base/345799

Log:
  Block creation of the new nodes for read-only tmpfs mounts.
  
  Tested by:    pho
  Sponsored by: The FreeBSD Foundation
  MFC after:    2 weeks
  Differential revision:        https://reviews.freebsd.org/D19737

Modified:
  head/sys/fs/tmpfs/tmpfs_subr.c

Modified: head/sys/fs/tmpfs/tmpfs_subr.c
==============================================================================
--- head/sys/fs/tmpfs/tmpfs_subr.c      Tue Apr  2 13:38:00 2019        
(r345798)
+++ head/sys/fs/tmpfs/tmpfs_subr.c      Tue Apr  2 13:41:26 2019        
(r345799)
@@ -218,6 +218,8 @@ tmpfs_alloc_node(struct mount *mp, struct tmpfs_mount 
                 */
                return (EBUSY);
        }
+       if ((mp->mnt_kern_flag & MNT_RDONLY) != 0)
+               return (EROFS);
 
        nnode = (struct tmpfs_node *)uma_zalloc_arg(tmp->tm_node_pool, tmp,
            M_WAITOK);
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