1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/staging/cowloop/cowloop.h b/drivers/staging/cowloop/cowloop.h
new file mode 100644
index 000000000000..bbd4a35ac667
--- /dev/null
+++ b/drivers/staging/cowloop/cowloop.h
@@ -0,0 +1,66 @@
+/*
+** DO NOT MODIFY THESE VALUES (would make old cowfiles unusable)
+*/
+#define	MAPUNIT		1024		/* blocksize for bit in bitmap       */
+#define	MUSHIFT		10		/* bitshift  for bit in bitmap       */
+#define	MUMASK		0x3ff		/* bitmask   for bit in bitmap       */
+
+#define	COWMAGIC	0x574f437f	/* byte-swapped '7f C O W'           */
+#define	COWDIRTY	0x01
+#define	COWPACKED	0x02
+#define	COWVERSION	1
+
+struct cowhead
+{
+	int		magic;		/* identifies a cowfile              */
+	short		version;	/* version of cowhead                */
+	short		flags;    	/* flags indicating status           */
+	unsigned long	mapunit;	/* blocksize per bit in bitmap       */
+	unsigned long	mapsize;	/* total size of bitmap (bytes)      */
+	unsigned long	doffset;	/* start-offset datablocks in cow    */
+	unsigned long	rdoblocks;	/* size of related read-only file    */
+	unsigned long	rdofingerprint;	/* fingerprint of read-only file     */
+	unsigned long	cowused;	/* number of datablocks used in cow  */
+};
+
+#define COWDEVDIR	"/dev/cow/"
+#define COWDEVICE	COWDEVDIR "%ld"
+#define COWCONTROL	COWDEVDIR "ctl"
+
+#define MAXCOWS		1024
+#define COWCTL		(MAXCOWS-1)	/* minor number of /dev/cow/ctl     */
+
+#define COWPROCDIR	"/proc/cow/"
+#define COWPROCFILE	COWPROCDIR "%d"
+
+/*
+** ioctl related stuff
+*/
+#define ANYDEV		((unsigned long)-1)
+
+struct cowpair
+{
+	unsigned char	*rdofile;	/* pathname of the rdofile           */
+	unsigned char	*cowfile;	/* pathname of the cowfile           */
+	unsigned short	rdoflen;	/* length of rdofile pathname        */
+	unsigned short	cowflen;	/* length of cowfile pathname        */
+	unsigned long	device;		/* requested/returned device number  */
+};
+
+struct cowwatch
+{
+	int      	flags;		/* request flags                     */
+	unsigned long	device;		/* requested device number           */
+	unsigned long	threshold;	/* continue if free Kb < threshold   */
+	unsigned long	totalkb;	/* ret: total filesystem size (Kb)   */
+	unsigned long	availkb;	/* ret: free  filesystem size (Kb)   */
+};
+
+#define	WATCHWAIT	0x01		/* block until threshold reached     */
+
+#define	COWSYNC		_IO  ('C', 1)
+#define	COWMKPAIR	_IOW ('C', 2, struct cowpair)
+#define	COWRMPAIR	_IOW ('C', 3, unsigned long)
+#define	COWWATCH	_IOW ('C', 4, struct cowwatch)
+#define	COWCLOSE	_IOW ('C', 5, unsigned long)
+#define	COWRDOPEN	_IOW ('C', 6, unsigned long)