Add a few more V_hacks to nfsclient to allow machines with a VIMAGE

kernel to boot from NFS. [1]

Note: this is not a full virtualization of nfsclient. It is only does
what advertised above and nothing more.

Requested by:	public demand [1]
Tested by:	kris, ..
MFC after:	5 days

4 files changed, 28 insertions, 3 deletions

diff --git a/sys/nfsclient/bootp_subr.c b/sys/nfsclient/bootp_subr.c
index e57b32a..4377f74 100644
--- a/sys/nfsclient/bootp_subr.c
+++ b/sys/nfsclient/bootp_subr.c
@@ -584,6 +584,8 @@ bootpc_call(struct bootpc_globalcontext *gctx, struct thread *td)
 	int retry;
 	const char *s;
 
+	CURVNET_SET(TD_TO_VNET(td));
+
 	/*
 	 * Create socket and set its recieve timeout.
 	 */
@@ -960,6 +962,7 @@ gotreply:
 out:
 	soclose(so);
 out0:
+	CURVNET_RESTORE();
 	return error;
 }
 
@@ -974,6 +977,8 @@ bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 	struct ifaddr *ifa;
 	struct sockaddr_dl *sdl;
 
+	CURVNET_SET(TD_TO_VNET(td));
+
 	error = socreate(AF_INET, &ifctx->so, SOCK_DGRAM, 0, td->td_ucred, td);
 	if (error != 0)
 		panic("nfs_boot: socreate, error=%d", error);
@@ -1048,6 +1053,8 @@ bootpc_fakeup_interface(struct bootpc_ifcontext *ifctx,
 		      ifctx->ireq.ifr_name);
 	ifctx->sdl = sdl;
 
+	CURVNET_RESTORE();
+
 	return error;
 }
 
diff --git a/sys/nfsclient/krpc_subr.c b/sys/nfsclient/krpc_subr.c
index 996cb05..7e4130f 100644
--- a/sys/nfsclient/krpc_subr.c
+++ b/sys/nfsclient/krpc_subr.c
@@ -55,6 +55,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/uio.h>
 
 #include <net/if.h>
+#include <net/vnet.h>
+
 #include <netinet/in.h>
 
 #include <rpc/types.h>
@@ -213,6 +215,8 @@ krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
 	nam = mhead = NULL;
 	from = NULL;
 
+	CURVNET_SET(TD_TO_VNET(td));
+
 	/*
 	 * Create socket and set its recieve timeout.
 	 */
@@ -425,6 +429,7 @@ krpc_call(struct sockaddr_in *sa, u_int prog, u_int vers, u_int func,
 	if (mhead) m_freem(mhead);
 	if (from) free(from, M_SONAME);
 	soclose(so);
+	CURVNET_RESTORE();
 	return error;
 }
 
diff --git a/sys/nfsclient/nfs_vfsops.c b/sys/nfsclient/nfs_vfsops.c
index 17dc5d4..0e10093 100644
--- a/sys/nfsclient/nfs_vfsops.c
+++ b/sys/nfsclient/nfs_vfsops.c
@@ -64,6 +64,8 @@ __FBSDID("$FreeBSD$");
 
 #include <net/if.h>
 #include <net/route.h>
+#include <net/vnet.h>
+
 #include <netinet/in.h>
 
 #include <rpc/rpc.h>
@@ -825,6 +827,8 @@ nfs_mount(struct mount *mp)
 	has_fh_opt = 0;
 	has_hostname_opt = 0;
 
+	CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
+
 	if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
 		error = EINVAL;
 		goto out;
@@ -1124,6 +1128,7 @@ out:
 		mp->mnt_kern_flag |= (MNTK_MPSAFE|MNTK_LOOKUP_SHARED);
 		MNT_IUNLOCK(mp);
 	}
+	CURVNET_RESTORE();
 	return (error);
 }
 
diff --git a/sys/nfsclient/nfs_vnops.c b/sys/nfsclient/nfs_vnops.c
index dc61927..b3c28a3 100644
--- a/sys/nfsclient/nfs_vnops.c
+++ b/sys/nfsclient/nfs_vnops.c
@@ -1555,14 +1555,21 @@ nfs_create(struct vop_create_args *ap)
 	struct vattr vattr;
 	int v3 = NFS_ISV3(dvp);
 
+	CURVNET_SET(CRED_TO_VNET(curthread->td_ucred));
+
 	/*
 	 * Oops, not for me..
 	 */
-	if (vap->va_type == VSOCK)
-		return (nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap));
+	if (vap->va_type == VSOCK) {
+		error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap);
+		CURVNET_RESTORE();
+		return (error);
+	}
 
-	if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0)
+	if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) {
+		CURVNET_RESTORE();
 		return (error);
+	}
 	if (vap->va_vaflags & VA_EXCLUSIVE)
 		fmode |= O_EXCL;
 again:
@@ -1658,6 +1665,7 @@ nfsmout:
 		KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp);
 	}
 	mtx_unlock(&(VTONFS(dvp))->n_mtx);
+	CURVNET_RESTORE();
 	return (error);
 }