Let pseudofs into the warmth of the FreeBSD CVS repo.

It's not finished yet (I still have to find a way to implement process-
dependent nodes without consuming too much memory, and the permission
system needs tightening up), but it's becoming hard to work on without
a repo (I've accidentally almost nuked it once already), and it works
(except for the lack of process-dependent nodes, that is).

I was supposed to commit this a week ago, but timed out waiting for jkh
to reply to some questions I had. Pass him a spoonful of bad karma :)

1 files changed, 181 insertions, 0 deletions

diff --git a/sys/fs/pseudofs/pseudofs.h b/sys/fs/pseudofs/pseudofs.h
new file mode 100644
index 0000000..928d2db
--- /dev/null
+++ b/sys/fs/pseudofs/pseudofs.h
@@ -0,0 +1,181 @@
+/*-
+ * Copyright (c) 2001 Dag-Erling Coïdan Smørgrav
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer
+ *    in this position and unchanged.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *      $FreeBSD$
+ */
+
+#ifndef _PSEUDOFS_H_INCLUDED
+#define _PSEUDOFS_H_INCLUDED
+
+/*
+ * Limits and constants
+ */
+#define PFS_NAMELEN		24
+#define PFS_DELEN		(8 + PFS_NAMELEN)
+
+typedef enum {
+	pfstype_none = 0,
+	pfstype_root,
+	pfstype_dir,
+	pfstype_this,
+	pfstype_parent,
+	pfstype_file,
+	pfstype_symlink,
+	pfstype_procdep
+} pfs_type_t;
+
+/* Flags */
+#define	PFS_DYNAMIC		1
+
+/*
+ * Data structures
+ */
+struct pfs_info;
+struct pfs_node;
+struct pfs_bitmap;
+
+typedef int (*pfs_fill_t)(struct pfs_node *, struct proc *, struct sbuf *);
+
+struct pfs_bitmap;		/* opaque */
+
+/*
+ * pfs_info: describes a pseudofs instance
+ */
+struct pfs_info {
+	char			 pi_name[MFSNAMELEN];
+	struct pfs_node		*pi_root;
+	/* members below this line aren't initialized */
+	/* currently, the mutex is only used to protect the bitmap */
+	struct mtx		 pi_mutex;
+	struct pfs_bitmap	*pi_bitmap;
+};
+
+/*
+ * pfs_node: describes a  node (file or directory) within a pseudofs
+ */
+struct pfs_node {
+	char			 pn_name[PFS_NAMELEN];
+	pfs_type_t		 pn_type;
+	int			 pn_flags;
+	uid_t			 pn_uid;
+	gid_t			 pn_gid;
+	mode_t			 pn_mode;
+	union {
+		void		*_pn_data;
+		pfs_fill_t	 _pn_func;
+		struct pfs_node	*_pn_nodes;
+	} u1;
+#define pn_data		u1._pn_data
+#define pn_func		u1._pn_func
+#define pn_nodes	u1._pn_nodes
+	/* members below this line aren't initialized */
+	struct pfs_node		*pn_parent;
+	union {
+		u_int32_t	 _pn_fileno;
+		struct pfs_node	*_pn_shadow;
+	} u2;
+#define pn_fileno	u2._pn_fileno
+#define pn_shadow	u2._pn_shadow
+};
+
+#define PFS_NODE(name, type, flags, uid, gid, mode, data) \
+        { (name), (type), (flags), (uid), (gid), (mode), { (data) } }
+#define PFS_DIR(name, flags, uid, gid, mode, nodes) \
+        PFS_NODE(name, pfstype_dir, flags, uid, gid, mode, nodes)
+#define PFS_ROOT(nodes) \
+        PFS_NODE("/", pfstype_root, 0, 0, 0, 0555, nodes)
+#define PFS_THIS \
+	PFS_NODE(".", pfstype_this, 0, 0, 0, 0, NULL)
+#define PFS_PARENT \
+	PFS_NODE("..", pfstype_parent, 0, 0, 0, 0, NULL)
+#define PFS_FILE(name, flags, uid, gid, mode, func) \
+	PFS_NODE(name, pfstype_file, flags, uid, gid, mode, func)
+#define PFS_SYMLINK(name, flags, uid, gid, mode, func) \
+	PFS_NODE(name, pfstype_symlink, flags, uid, gid, mode, func)
+#define PFS_LASTNODE \
+	PFS_NODE("", pfstype_none, 0, 0, 0, 0, NULL)
+
+/*
+ * VFS interface
+ */
+int	 pfs_mount		(struct pfs_info *pi,
+				 struct mount *mp, char *path, caddr_t data,
+				 struct nameidata *ndp, struct proc *p);
+int	 pfs_unmount		(struct mount *mp, int mntflags,
+				 struct proc *p);
+int	 pfs_root		(struct mount *mp, struct vnode **vpp);
+int	 pfs_statfs		(struct mount *mp, struct statfs *sbp,
+				 struct proc *p);
+int	 pfs_init		(struct pfs_info *pi, struct vfsconf *vfc);
+int	 pfs_uninit		(struct pfs_info *pi, struct vfsconf *vfc);
+
+/*
+ * Now for some initialization magic...
+ */
+#define PSEUDOFS(name, root)						\
+									\
+static struct pfs_info name##_info = {					\
+	#name,								\
+	&(root)								\
+};									\
+									\
+static int								\
+_##name##_mount(struct mount *mp, char *path, caddr_t data,		\
+	     struct nameidata *ndp, struct proc *p) {			\
+        return pfs_mount(&name##_info, mp, path, data, ndp, p);		\
+}									\
+									\
+static int								\
+_##name##_init(struct vfsconf *vfc) {					\
+        return pfs_init(&name##_info, vfc);				\
+}									\
+									\
+static int								\
+_##name##_uninit(struct vfsconf *vfc) {					\
+        return pfs_uninit(&name##_info, vfc);				\
+}									\
+									\
+static struct vfsops testfs_vfsops = {					\
+	_##name##_mount,						\
+	vfs_stdstart,							\
+	pfs_unmount,							\
+	pfs_root,							\
+	vfs_stdquotactl,						\
+	pfs_statfs,							\
+	vfs_stdsync,							\
+	vfs_stdvget,							\
+	vfs_stdfhtovp,							\
+	vfs_stdcheckexp,						\
+	vfs_stdvptofh,							\
+	_##name##_init,							\
+	_##name##_uninit,						\
+	vfs_stdextattrctl,						\
+};									\
+VFS_SET(name##_vfsops, name, VFCF_SYNTHETIC);				\
+MODULE_DEPEND(name, pseudofs, 1, 1, 1);
+
+#endif