jilles 869c43b8d9 nullfs: Improve f_flags in statfs(). ...

Include some flags of the nullfs mount itself:
MNT_RDONLY, MNT_NOEXEC, MNT_NOSUID, MNT_UNION, MNT_NOSYMFOLLOW.

This allows userland code calling statfs() or fstatfs() to see these flags.
In particular, this allows opendir() to detect that a -t nullfs -o union
mount needs deduplication (otherwise at least . and .. are returned twice)
and allows rtld to detect a -t nullfs -o noexec mount as noexec.

Turn off the MNT_ROOTFS flag from the underlying filesystem because the
nullfs mount is definitely not the root filesystem.

Reviewed by:	kib
MFC after:	1 week

2013-03-02 12:42:23 +00:00

..

null_subr.c

The current default size of the nullfs hash table used to lookup the

2013-01-14 05:44:47 +00:00

null_vfsops.c

nullfs: Improve f_flags in statfs().

2013-03-02 12:42:23 +00:00

null_vnops.c

When nullfs mount is forcibly unmounted and nullfs vnode is reclaimed,

2013-01-10 18:24:48 +00:00

null.h

Add the "nocache" nullfs mount option, which disables the caching of

2013-01-03 19:17:57 +00:00