1 typedef struct VacFs VacFs;
2 typedef struct VacDir VacDir;
3 typedef struct VacFile VacFile;
4 typedef struct VacDirEnum VacDirEnum;
5 
6 /*
7  * Mode bits
8  */
9 enum
10 {
11 	ModeOtherExec = (1<<0),		
12 	ModeOtherWrite = (1<<1),
13 	ModeOtherRead = (1<<2),
14 	ModeGroupExec = (1<<3),
15 	ModeGroupWrite = (1<<4),
16 	ModeGroupRead = (1<<5),
17 	ModeOwnerExec = (1<<6),
18 	ModeOwnerWrite = (1<<7),
19 	ModeOwnerRead = (1<<8),
20 	ModeSticky = (1<<9),
21 	ModeSetUid = (1<<10),
22 	ModeSetGid = (1<<11),
23 	ModeAppend = (1<<12),		/* append only file */
24 	ModeExclusive = (1<<13),	/* lock file - plan 9 */
25 	ModeLink = (1<<14),		/* sym link */
26 	ModeDir	= (1<<15),		/* duplicate of DirEntry */
27 	ModeHidden = (1<<16),		/* MS-DOS */
28 	ModeSystem = (1<<17),		/* MS-DOS */
29 	ModeArchive = (1<<18),		/* MS-DOS */
30 	ModeTemporary = (1<<19),	/* MS-DOS */
31 	ModeSnapshot = (1<<20),		/* read only snapshot */
32 };
33 
34 enum
35 {
36 	MetaMagic = 0x5656fc79,
37 	MetaHeaderSize = 12,
38 	MetaIndexSize = 4,
39 	IndexEntrySize = 8,
40 	DirMagic = 0x1c4d9072,
41 };
42 
43 enum
44 {
45 	DirPlan9Entry = 1,	/* not valid in version >= 9 */
46 	DirNTEntry,		/* not valid in version >= 9 */
47 	DirQidSpaceEntry,
48 	DirGenEntry,		/* not valid in version >= 9 */
49 };
50 
51 struct VacDir
52 {
53 	char *elem;		/* path element */
54 	ulong entry;		/* entry in directory for data */
55 	ulong gen;		/* generation of data entry */
56 	ulong mentry;		/* entry in directory for meta */
57 	ulong mgen;		/* generation of meta entry */
58 	uvlong size;		/* size of file */
59 	uvlong qid;		/* unique file id */
60 	
61 	char *uid;		/* owner id */
62 	char *gid;		/* group id */
63 	char *mid;		/* last modified by */
64 	ulong mtime;		/* last modified time */
65 	ulong mcount;		/* number of modifications: can wrap! */
66 	ulong ctime;		/* directory entry last changed */
67 	ulong atime;		/* last time accessed */
68 	ulong mode;		/* various mode bits */
69 
70 	/* plan 9 */
71 	int plan9;
72 	uvlong p9path;
73 	ulong p9version;
74 
75 	/* sub space of qid */
76 	int qidspace;
77 	uvlong qidoffset;	/* qid offset */
78 	uvlong qidmax;		/* qid maximum */
79 };
80 
81 
82 struct VacFs
83 {
84 	int		ref;
85 	uchar	score[VtScoreSize];
86 	VacFile	*root;
87 	VtConn	*z;
88 	int		mode;
89 	int		bsize;
90 	uvlong	qid;
91 	VtCache	*cache;
92 };
93 
94 VacFs	*vacfsopen(VtConn *z, char *file, int mode, int ncache);
95 VacFs	*vacfsopenscore(VtConn *z, u8int *score, int mode, int ncache);
96 VacFs	*vacfscreate(VtConn *z, int bsize, int ncache);
97 void		vacfsclose(VacFs *fs);
98 int		vacfssync(VacFs *fs);
99 int		vacfssnapshot(VacFs *fs, char *src, char *dst);
100 int		vacfsgetscore(VacFs *fs, u8int *score);
101 
102 /* 
103  * other ideas
104  *
105  * VacFs *vfsSnapshot(VacFs*, char *src);
106  * int vfsGraft(VacFs*, char *name, VacFs*);
107  */
108 
109 VacFile *vacfsgetroot(VacFs *fs);
110 VacFile	*vacfileopen(VacFs *fs, char *path);
111 VacFile	*vacfilecreate(VacFile *file, char *elem, ulong perm, char *muid);
112 VacFile	*vacfilewalk(VacFile *file, char *elem);
113 int		vacfileremove(VacFile *file, char *muid);
114 int		vacfileread(VacFile *file, void *buf, int n, vlong offset);
115 int		vacfileblockscore(VacFile *file, u32int, u8int*);
116 int		vacfilewrite(VacFile *file, void *buf, int n, vlong offset, char *muid);
117 int		vacfilereadpacket(VacFile *file, Packet **pp, vlong offset);
118 int		vacfilewritepacket(VacFile *file, Packet *p, vlong offset, char *muid);
119 uvlong	vacfilegetid(VacFile *file);
120 ulong	vacfilegetmcount(VacFile *file);
121 int		vacfileisdir(VacFile *file);
122 int		vacfileisroot(VacFile *file);
123 int		vacfilegetblocksize(VacFile *file, u32int bn, u8int *score);
124 int		vacfilegetsize(VacFile *file, uvlong *size);
125 int		vacfilegetdir(VacFile *file, VacDir *dir);
126 int		vacfilesetdir(VacFile *file, VacDir *dir, char *muid);
127 int		vacfilegetvtentry(VacFile *file, VtEntry *entry);
128 VacFile	*vacfilegetparent(VacFile *file);
129 int		vacfilesync(VacFile*);
130 VacFile	*vacfileincref(VacFile*);
131 int		vacfiledecref(VacFile*);
132 
133 void		vdcleanup(VacDir *dir);
134 void		vdcopy(VacDir *dst, VacDir *src);
135 
136 
137 VacDirEnum	*vdeopen(VacFile*);
138 int			vderead(VacDirEnum*, VacDir *);
139 void			vdeclose(VacDirEnum*);
140