start thinking about vac -- doesn't build yet

1 files changed, 126 insertions, 0 deletions

diff --git a/src/cmd/vac/vac.h b/src/cmd/vac/vac.h
new file mode 100644
index 00000000..549c441c
--- /dev/null
+++ b/src/cmd/vac/vac.h
@@ -0,0 +1,126 @@
+typedef struct VacFS VacFS;
+typedef struct VacDir VacDir;
+typedef struct VacFile VacFile;
+typedef struct VacDirEnum VacDirEnum;
+
+/*
+ * Mode bits
+ */
+enum {
+	ModeOtherExec = (1<<0),		
+	ModeOtherWrite = (1<<1),
+	ModeOtherRead = (1<<2),
+	ModeGroupExec = (1<<3),
+	ModeGroupWrite = (1<<4),
+	ModeGroupRead = (1<<5),
+	ModeOwnerExec = (1<<6),
+	ModeOwnerWrite = (1<<7),
+	ModeOwnerRead = (1<<8),
+	ModeSticky = (1<<9),
+	ModeSetUid = (1<<10),
+	ModeSetGid = (1<<11),
+	ModeAppend = (1<<12),		/* append only file */
+	ModeExclusive = (1<<13),	/* lock file - plan 9 */
+	ModeLink = (1<<14),		/* sym link */
+	ModeDir	= (1<<15),		/* duplicate of DirEntry */
+	ModeHidden = (1<<16),		/* MS-DOS */
+	ModeSystem = (1<<17),		/* MS-DOS */
+	ModeArchive = (1<<18),		/* MS-DOS */
+	ModeTemporary = (1<<19),	/* MS-DOS */
+	ModeSnapshot = (1<<20),		/* read only snapshot */
+};
+
+enum {
+	MetaMagic = 0x5656fc79,
+	MetaHeaderSize = 12,
+	MetaIndexSize = 4,
+	IndexEntrySize = 8,
+	DirMagic = 0x1c4d9072,
+};
+
+enum {
+	DirPlan9Entry = 1,	/* not valid in version >= 9 */
+	DirNTEntry,		/* not valid in version >= 9 */
+	DirQidSpaceEntry,
+	DirGenEntry,		/* not valid in version >= 9 */
+};
+
+struct VacDir {
+	char *elem;		/* path element */
+	ulong entry;		/* entry in directory for data */
+	ulong gen;		/* generation of data entry */
+	ulong mentry;		/* entry in directory for meta */
+	ulong mgen;		/* generation of meta entry */
+	uvlong size;		/* size of file */
+	uvlong qid;		/* unique file id */
+	
+	char *uid;		/* owner id */
+	char *gid;		/* group id */
+	char *mid;		/* last modified by */
+	ulong mtime;		/* last modified time */
+	ulong mcount;		/* number of modifications: can wrap! */
+	ulong ctime;		/* directory entry last changed */
+	ulong atime;		/* last time accessed */
+	ulong mode;		/* various mode bits */
+
+	/* plan 9 */
+	int plan9;
+	uvlong p9path;
+	ulong p9version;
+
+	/* sub space of qid */
+	int qidSpace;
+	uvlong qidOffset;	/* qid offset */
+	uvlong qidMax;		/* qid maximum */
+};
+
+VacFS *vfsOpen(VtSession *z, char *file, int readOnly, long ncache);
+VacFS *vfsCreate(VtSession *z, int bsize, long ncache);
+int vfsGetBlockSize(VacFS*);
+int vfsIsReadOnly(VacFS*);
+VacFile *vfsGetRoot(VacFS*);
+
+long vfsGetCacheSize(VacFS*);
+int vfsSetCacheSize(VacFS*, long);
+int vfsSnapshot(VacFS*, char *src, char *dst);
+int vfsSync(VacFS*);
+int vfsClose(VacFS*);
+int vfsGetScore(VacFS*, uchar score[VtScoreSize]);
+
+/* 
+ * other ideas
+ *
+ * VacFS *vfsSnapshot(VacFS*, char *src);
+ * int vfsGraft(VacFS*, char *name, VacFS*);
+ */
+
+VacFile *vfOpen(VacFS*, char *path);
+VacFile *vfCreate(VacFile*, char *elem, ulong perm, char *user);
+VacFile *vfWalk(VacFile*, char *elem);
+int vfRemove(VacFile*, char*);
+int vfRead(VacFile*, void *, int n, vlong offset);
+int vfWrite(VacFile*, void *, int n, vlong offset, char *user);
+int vfReadPacket(VacFile*, Packet**, vlong offset);
+int vfWritePacket(VacFile*, Packet*, vlong offset, char *user);
+uvlong vfGetId(VacFile*);
+ulong vfGetMcount(VacFile*);
+int vfIsDir(VacFile*);
+int vfGetBlockScore(VacFile*, ulong bn, uchar score[VtScoreSize]);
+int vfGetSize(VacFile*, uvlong *size);
+int vfGetDir(VacFile*, VacDir*);
+int vfSetDir(VacFile*, VacDir*);
+int vfGetVtEntry(VacFile*, VtEntry*);
+VacFile *vfGetParent(VacFile*);
+int vfSync(VacFile*);
+VacFile *vfIncRef(VacFile*);
+void vfDecRef(VacFile*);
+VacDirEnum *vfDirEnum(VacFile*);
+int vfIsRoot(VacFile *vf);
+
+void	vdCleanup(VacDir *dir);
+void	vdCopy(VacDir *dst, VacDir *src);
+
+VacDirEnum *vdeOpen(VacFS*, char *path);
+int vdeRead(VacDirEnum*, VacDir *, int n);
+void vdeFree(VacDirEnum*);
+