DragonFlyBSD

Initial patch, works locally; not extensively tested::

diff --git a/sys/vfs/tmpfs/tmpfs.h b/sys/vfs/tmpfs/tmpfs.h
index 4404cc6..609b1c1 100644
--- a/sys/vfs/tmpfs/tmpfs.h
+++ b/sys/vfs/tmpfs/tmpfs.h
@ -399,6 +399,8 @ struct tmpfs_mount {
struct objcache *tm_node_pool;

int                     tm_flags;

       struct netexport        tm_export;
 };

#define TMPFS_LOCK(tm) lockmgr(&(tm)->allnode_lock, LK_EXCLUSIVE|LK_RETRY)
diff --git a/sys/vfs/tmpfs/tmpfs_vfsops.c b/sys/vfs/tmpfs/tmpfs_vfsops.c
index 940643a..9ad3084 100644
--- a/sys/vfs/tmpfs/tmpfs_vfsops.c
+++ b/sys/vfs/tmpfs/tmpfs_vfsops.c
@ -145,12 +145,9 @ tmpfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
        gid_t   root_gid = cred->cr_gid;
        mode_t  root_mode = (VREAD | VWRITE);

- if (mp->mnt_flag & MNT_UPDATE) {
- /* XXX: There is no support yet to update file system
- * settings. Should be added. /

return EOPNOTSUPP;
- }
+ / XXX */
+ if (mp->mnt_flag & MNT_UPDATE)
+ return (EOPNOTSUPP);

/*
 * mount info
@ -174,6 +171,7 @ tmpfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
                root_mode = args.ta_root_mode;
        }

+
/* * If mount by non-root, then verify that user has necessary * permissions on the device.
@ -518,6 +516,27 @ tmpfs_vptofh(struct vnode *vp, struct fid *fhp)

/* --------------------------------------------------------------------- */

static int
+tmpfs_checkexp(struct mount mp, struct sockaddr *nam, int *exflagsp,
struct ucred **credanonp)
{
struct tmpfs_mount *tmp;
+ struct netcred *nc;

tmp = (struct tmpfs_mount *) mp->mnt_data;
+ nc = vfs_export_lookup(mp, &tmp->tm_export, nam);
+ if (nc == NULL)
+ return (EACCES);

*exflagsp = nc->netc_exflags;
+ *credanonp = &nc->netc_anon;

return (0);
}

/ --------------------------------------------------------------------- /

+
/ * tmpfs vfs operations.
*/
@ -529,7 +548,8 @ static struct vfsops tmpfs_vfsops = {
.vfs_statfs = tmpfs_statfs,
.vfs_fhtovp = tmpfs_fhtovp,
.vfs_vptofh = tmpfs_vptofh,
- .vfs_sync = vfs_stdsync
+ .vfs_sync = vfs_stdsync,
+ .vfs_checkexp = tmpfs_checkexp,
};

VFS_SET(tmpfs_vfsops, tmpfs, 0);
diff --git a/sys/vfs/tmpfs/tmpfs_vnops.c b/sys/vfs/tmpfs/tmpfs_vnops.c
index 3a5d7a0..9726272 100644
--- a/sys/vfs/tmpfs/tmpfs_vnops.c
++ b/sys/vfs/tmpfs/tmpfs_vnops.c
@ -48,6 +48,7 @
 #include <sys/unistd.h>
 #include <sys/vfsops.h>
 #include <sys/vnode.h>
#include <sys/mountctl.h>

#include <vm/vm.h>
 #include <vm/vm_object.h>
@ -1680,6 +1681,33 @ filt_tmpfsvnode(struct knote *kn, long hint)

/* --------------------------------------------------------------------- */

static int
+tmpfs_mountctl(struct vop_mountctl_args ap)
{
+ struct tmpfs_mount *tmp;
+ struct mount *mp;
+ int rc;

switch (ap->a_op) {
+ case (MOUNTCTL_SET_EXPORT):
+ mp = ap->a_head.a_ops->head.vv_mount;
+ tmp = (struct tmpfs_mount *) mp->mnt_data;

if (ap->a_ctllen != sizeof(struct export_args))
+ rc = (EINVAL);
+ else
+ rc = vfs_export(mp, &tmp->tm_export,
+ (struct export_args *) ap->a_ctl);
+ break;
+ default:
+ rc = vop_stdmountctl(ap);
+ break;
+ }
+ return (rc);
}

/ --------------------------------------------------------------------- /

/ * vnode operations vector used for files stored in a tmpfs file system.
*/
@ -1699,6 +1727,7 @ struct vop_ops tmpfs_vnode_vops = {
.vop_read = tmpfs_read,
.vop_write = tmpfs_write,
.vop_fsync = tmpfs_fsync,
+ .vop_mountctl = tmpfs_mountctl,
.vop_nremove = tmpfs_nremove,
.vop_nlink = tmpfs_nlink,
.vop_nrename = tmpfs_nrename,

Closing;
tmpfs can be NFS exported now, thanks.

A minor problem, as described on issue log,
is that readdirplus isn't supported from DragonFly NFS client.
This is used by default on DragonFly NFS client.
Will update tmpfs.5 with info on NFS support & this issue.

Will also MFC to rel3_0.