Reviewed by: no-one yet, but nonintrusive until configed in.. :)

Submitted by:	julian@freebsd.org
Obtained from:	written from scratch

1 files changed, 195 insertions, 0 deletions

diff --git a/sys/miscfs/devfs/devfsdefs.h b/sys/miscfs/devfs/devfsdefs.h
new file mode 100644
index 0000000..8f5e7b9d3
--- /dev/null
+++ b/sys/miscfs/devfs/devfsdefs.h
@@ -0,0 +1,195 @@
+#define DEBUG 1
+#ifdef DEBUG
+#define DBPRINT(A) printf(A)
+#else
+#define DBPRINT(A)
+#endif
+
+/*
+ * Written by Julian Elischer (julian@DIALIX.oz.au)
+ *
+ * $Header: /sys/miscfs/devfs/RCS/devfsdefs.h,v 1.2 1994/12/28 02:43:47 root Exp root $
+ */
+
+/* first a couple of defines for compatibility with inodes */
+
+#define	ISUID		04000		/* set user identifier when exec'ing */
+#define	ISGID		02000		/* set group identifier when exec'ing */
+#define	ISVTX		01000		/* save execution information on exit */
+#define	IREAD		0400		/* read permission */
+#define	IWRITE		0200		/* write permission */
+#define	IEXEC		0100		/* execute permission */
+
+
+#define	ILOCKED		0x0001		/* inode is locked */
+#define	IWANT		0x0002		/* some process waiting on lock */
+#define	IRENAME		0x0004		/* inode is being renamed */
+#define	IUPD		0x0010		/* file has been modified */
+#define	IACC		0x0020		/* inode access time to be updated */
+#define	ICHG		0x0040		/* inode has been changed */
+#define	IMOD		0x0080		/* inode has been modified */
+#define	ISHLOCK		0x0100		/* file has shared lock */
+#define	IEXLOCK		0x0200		/* file has exclusive lock */
+#define	ILWAIT		0x0400		/* someone waiting on file lock */
+
+/*
+ * Lock and unlock inodes.
+ */
+#ifdef notdef
+#define	DNLOCK(ip) { \
+	while ((ip)->i_flag & ILOCKED) { \
+		(ip)->i_flag |= IWANT; \
+		(void) sleep((caddr_t)(ip), PINOD); \
+	} \
+	(ip)->i_flag |= ILOCKED; \
+}
+
+#define	DNUNLOCK(ip) { \
+	(ip)->i_flag &= ~ILOCKED; \
+	if ((ip)->i_flag&IWANT) { \
+		(ip)->i_flag &= ~IWANT; \
+		wakeup((caddr_t)(ip)); \
+	} \
+}
+#else
+#define DNLOCK(ip)
+#define DNUNLOCK(ip)
+#endif
+
+
+#define DEVMAXNAMESIZE 32
+#define DEVMAXPATHSIZE 128
+#define	DEV_DIR 1
+#define DEV_BDEV 2
+#define DEV_CDEV 3
+#define DEV_DDEV 4
+#define	DEV_ALIAS 5
+#define DEV_SLNK 6
+
+
+extern int (**devfs_vnodeop_p)();	/* our own vector array for dirs */
+extern int (**dev_spec_vnodeop_p)();	/* our own vector array for devs */
+
+typedef struct dev_back *devb_p;
+typedef struct dev_front *devf_p;
+typedef	struct devnode	*dn_p;
+
+struct	devnode
+{
+	u_short type;
+	int	flags;		/* more inode compatible for now *//*XXXkill*/
+	u_short	mode;		/* basically inode compatible (drwxrwxrwx) */
+	u_short	uid;		/* basically inode compatible  */
+	u_short	gid;		/* basically inode compatible  */
+	struct timespec	atime;	/* time of last access */
+	struct timespec	mtime;	/* time of last modification */
+	struct timespec	ctime;	/* time file changed */
+	int	links;		/* how many file links does this node have? */
+	struct	devfsmount *dvm; /* the mount structure for this 'plane' */
+	struct	vnode *vn;	/* address of last vnode that represented us */
+	u_long	vn_id;		/* make sure we have the right vnode */
+	int (***ops)();		/* yuk... pointer to pointer(s) to funcs */
+	int	len;		/* of any associated info (e.g. dir data) */
+	union  typeinfo {
+		struct {
+			struct	cdevsw	*cdevsw;
+			dev_t	dev;
+		}Cdev;
+		struct {
+			struct	bdevsw	*bdevsw;
+			dev_t	dev;
+		}Bdev;
+		struct {
+			int (***ops)();	 /* duplicate, used in dev_add_node */
+			int	arg;
+		}Ddev;
+		struct {
+			devf_p	dirlist;
+			devf_p	*dirlast;
+			dn_p	parent;
+			devf_p	myname;
+			int	entrycount;
+		}Dir;	
+		struct {
+			devb_p	dirlist;
+			devb_p	*dirlast;
+			dn_p	parent;
+			devb_p	myname;
+			int	entrycount;
+		}BackDir;	
+		struct {
+			char	*name;	/* must be allocated separatly */
+			int	namelen;
+		}Slnk;
+		struct {
+			devb_p	realthing;
+			devb_p	next;
+		}Alias;
+	}by;
+};
+typedef	struct devnode	devnode_t;
+
+struct	dev_back
+{
+	devb_p	next;		/* next object in this directory */
+	devb_p	*prevp;		/* previous pointer in directory linked list */
+	devb_p	aliases;	/* chain of aliases (kill if we are deleted)*/
+	int	alias_count;	/* how many 'alias' nodes reference us. */
+	devf_p	fronts;		/* the linked list of all our front nodes */
+	devf_p	*lastfront;	/* the end of the front node chain */
+	int	frontcount;	/* number of front nodes that reference us*/
+	dn_p parent;	/* backpointer to the directory itself */
+	dn_p dnp;	/* info a STAT would look at */
+	char	name[DEVMAXNAMESIZE];
+};
+
+typedef struct dev_back devb_t;
+extern struct dev_back *dev_root;		/* always exists */
+
+
+/*
+ * Rules for front nodes:
+ * Dirs hava a strict 1:1 relationship with their OWN devnode
+ * Symlinks similarly
+ * Device Nodes ALWAYS point to the devnode that is linked
+ * to the Backing node. (with a ref count)
+ */
+struct dev_front
+{
+	devf_p	next;		/* next item in this directory chain */
+	devf_p	*prevp;		/* previous pointer in the directory */
+	devf_p	file_node;	/* the file node this represents */
+	devf_p	next_front;	/* pointer to next item for this object */
+	devf_p	*prev_frontp;	/* previous pointer in object chain */
+	devb_p	realthing;	/* backpointer to the backing object */
+	dn_p parent;	/* our PARENT directory node */
+	dn_p dnp;	/* info a STAT would look at */
+	char	name[DEVMAXNAMESIZE];
+};
+typedef struct dev_front devf_t;
+
+
+
+/*
+ * DEVFS specific per/mount information, used to link a monted fs to a
+ * particular 'plane' of front nodes.
+ */
+struct devfsmount
+{
+	struct mount *mount;		/* vfs mount struct for this fs	*/
+	devf_p	plane_root;		/* the root of this 'plane'	*/
+	int	flags;			/* usefule some day 8-) 	*/
+};
+
+struct dev_vn_data
+{
+	char	magic[6];		/* = "devfs" if correct */
+	devf_p	front;
+	devb_p	back;
+};
+
+extern struct vnodeops spec_vnodeops,devfs_vnodeops;
+/*
+ * Prototypes for DEVFS virtual filesystem operations
+ */
+#include "devfs_proto.h"