Differential D30218 Diff 90116 sys/fs/unionfs/union_vfsops.c

Changeset View

Standalone View

sys/fs/unionfs/union_vfsops.c

Show First 20 Lines • Show All 365 Lines • ▼ Show 20 Lines	if (flags & LK_TYPE_MASK)
vn_lock(vp, flags);		vn_lock(vp, flags);

*vpp = vp;		*vpp = vp;

return (0);		return (0);
}		}

static int		static int
unionfs_quotactl(struct mount mp, int cmd, uid_t uid, void arg)		unionfs_quotactl(struct mount mp, int cmd, uid_t uid, void arg,
		bool *mp_busy)
{		{
		struct mount *uppermp;
struct unionfs_mount *ump;		struct unionfs_mount *ump;
		int error;
		bool unbusy;

ump = MOUNTTOUNIONFSMOUNT(mp);		ump = MOUNTTOUNIONFSMOUNT(mp);
		uppermp = atomic_load_ptr(&ump->um_uppervp->v_mount);
		KASSERT(*mp_busy == true, ("upper mount not busy"));
/*		/*
		* See comment in sys_quotactl() for an explanation of why the
		* lower mount needs to be busied by the caller of VFS_QUOTACTL()
		* but may be unbusied by the implementation. We must unbusy
		* the upper mount for the same reason; otherwise a namei lookup
		* issued by the VFS_QUOTACTL() implementation could traverse the
		* upper mount and deadlock.
		*/
		vfs_unbusy(mp);
		*mp_busy = false;
		unbusy = true;
		error = vfs_busy(uppermp, 0);
		/*
* Writing is always performed to upper vnode.		* Writing is always performed to upper vnode.
*/		*/
return (VFS_QUOTACTL(ump->um_uppervp->v_mount, cmd, uid, arg));		if (error == 0)
		error = VFS_QUOTACTL(uppermp, cmd, uid, arg, &unbusy);
		if (unbusy)
		vfs_unbusy(uppermp);

		return (error);
}		}

static int		static int
unionfs_statfs(struct mount mp, struct statfs sbp)		unionfs_statfs(struct mount mp, struct statfs sbp)
{		{
struct unionfs_mount *ump;		struct unionfs_mount *ump;
int error;		int error;
struct statfs *mstat;		struct statfs *mstat;
▲ Show 20 Lines • Show All 112 Lines • Show Last 20 Lines