Update ZFS from version 6 to 13 and bring some FreeBSD-specific changes.

This bring huge amount of changes, I'll enumerate only user-visible changes:

- Delegated Administration

	Allows regular users to perform ZFS operations, like file system
	creation, snapshot creation, etc.

- L2ARC

	Level 2 cache for ZFS - allows to use additional disks for cache.
	Huge performance improvements mostly for random read of mostly
	static content.

- slog

	Allow to use additional disks for ZFS Intent Log to speed up
	operations like fsync(2).

- vfs.zfs.super_owner

	Allows regular users to perform privileged operations on files stored
	on ZFS file systems owned by him. Very careful with this one.

- chflags(2)

	Not all the flags are supported. This still needs work.

- ZFSBoot

	Support to boot off of ZFS pool. Not finished, AFAIK.

	Submitted by:	dfr

- Snapshot properties

- New failure modes

	Before if write requested failed, system paniced. Now one
	can select from one of three failure modes:
	- panic - panic on write error
	- wait - wait for disk to reappear
	- continue - serve read requests if possible, block write requests

- Refquota, refreservation properties

	Just quota and reservation properties, but don't count space consumed
	by children file systems, clones and snapshots.

- Sparse volumes

	ZVOLs that don't reserve space in the pool.

- External attributes

	Compatible with extattr(2).

- NFSv4-ACLs

	Not sure about the status, might not be complete yet.

	Submitted by:	trasz

- Creation-time properties

- Regression tests for zpool(8) command.

Obtained from:	OpenSolaris

1 files changed, 10 insertions, 4 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 327a9c5..32093c0 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -108,7 +108,6 @@ static void	v_decr_useonly(struct vnode *);
 static void	v_upgrade_usecount(struct vnode *);
 static void	vfree(struct vnode *);
 static void	vnlru_free(int);
-static void	vdestroy(struct vnode *);
 static void	vgonel(struct vnode *);
 static void	vfs_knllock(void *arg);
 static void	vfs_knlunlock(void *arg);
@@ -419,7 +418,7 @@ vfs_suser(struct mount *mp, struct thread *td)
 	 * If the thread is jailed, but this is not a jail-friendly file
 	 * system, deny immediately.
 	 */
-	if (jailed(td->td_ucred) && !(mp->mnt_vfc->vfc_flags & VFCF_JAIL))
+	if (!(mp->mnt_vfc->vfc_flags & VFCF_JAIL) && jailed(td->td_ucred))
 		return (EPERM);
 
 	/*
@@ -438,7 +437,14 @@ vfs_suser(struct mount *mp, struct thread *td)
 		return (EPERM);
 	}
 
-	if ((mp->mnt_flag & MNT_USER) == 0 ||
+	/*
+	 * If file system supports delegated administration, we don't check
+	 * for the PRIV_VFS_MOUNT_OWNER privilege - it will be better verified
+	 * by the file system itself.
+	 * If this is not the user that did original mount, we check for
+	 * the PRIV_VFS_MOUNT_OWNER privilege.
+	 */
+	if (!(mp->mnt_vfc->vfc_flags & VFCF_DELEGADMIN) &&
 	    mp->mnt_cred->cr_uid != td->td_ucred->cr_uid) {
 		if ((error = priv_check(td, PRIV_VFS_MOUNT_OWNER)) != 0)
 			return (error);
@@ -793,7 +799,7 @@ SYSINIT(vnlru, SI_SUB_KTHREAD_UPDATE, SI_ORDER_FIRST, kproc_start,
  * Routines having to do with the management of the vnode table.
  */
 
-static void
+void
 vdestroy(struct vnode *vp)
 {
 	struct bufobj *bo;