Import sources from 2011-03-30 iso image

1 files changed, 60 insertions, 0 deletions

diff --git a/sys/src/cmd/cfs/inode.h b/sys/src/cmd/cfs/inode.h
new file mode 100755
index 000000000..22fa16047
--- /dev/null
+++ b/sys/src/cmd/cfs/inode.h
@@ -0,0 +1,60 @@
+typedef struct Ibuf	Ibuf;
+typedef struct Imap	Imap;
+typedef struct Icache	Icache;
+
+enum
+{
+	Nicache=	64,		/* number of inodes kept in pool */
+};
+
+/*
+ *  a cached inode buffer
+ */
+struct Ibuf
+{
+	Lru;			/* must be first in structure */
+	int	inuse;		/* non-0 if in use */
+	ulong	ino;		/* index into inode table */
+	Inode	inode;		/* the inode contents */
+};
+
+/*
+ *  in-core qid to inode mapping
+ */
+struct Imap
+{
+	Lru;			/* must be first in structure */
+	Qid	qid;
+	Ibuf	*b;		/* cache buffer */
+	int	inuse;		/* non-0 if in use */
+};
+
+/*
+ *  the inode cache
+ */
+struct Icache
+{
+	Disk;
+
+	int	nino;		/* number of inodes */
+	ulong	ib0;		/* first inode block */
+	int	nib;		/* number of inode blocks */
+	int	i2b;		/* inodes to a block */
+
+	Ibuf	ib[Nicache];	/* inode buffers */
+	Lru	blru;
+
+	Imap	*map;		/* inode to qid mapping */
+	Lru	mlru;
+};
+
+Ibuf*	ialloc(Icache*, ulong);
+Ibuf*	iget(Icache*, Qid);
+Ibuf*	iread(Icache*, ulong);
+int	iformat(Icache*, int, ulong, char*, int, int);
+int	iinit(Icache*, int, int, char*);
+int	iremove(Icache*, ulong);
+int	iupdate(Icache*, ulong, Qid);
+int	iwrite(Icache*, Ibuf*);
+void	ifree(Icache*, Ibuf*);
+void	iinc(Icache*, Ibuf*);