1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
#include "stdinc.h"
#include "dat.h"
#include "fns.h"
char *host;
int readonly = 1; /* for part.c */
void
usage(void)
{
fprint(2, "usage: wrarena [-h host] arenafile [offset]\n");
threadexitsall("usage");
}
static void
rdarena(VtConn *z, Arena *arena, u64int offset)
{
u64int a, aa, e;
u32int magic;
Clump cl;
uchar score[VtScoreSize];
ZBlock *lump;
fprint(2, "copying %s to venti\n", arena->name);
printarena(2, arena);
a = arena->base;
e = arena->base + arena->size;
if(offset != ~(u64int)0) {
if(offset >= e-a)
sysfatal("bad offset %llud >= %llud\n",
offset, e-a);
aa = offset;
} else
aa = 0;
for(; aa < e; aa += ClumpSize+cl.info.size) {
magic = clumpmagic(arena, aa);
if(magic == ClumpFreeMagic)
break;
if(magic != ClumpMagic) {
fprint(2, "illegal clump magic number %#8.8ux offset %llud\n",
magic, aa);
break;
}
lump = loadclump(arena, aa, 0, &cl, score, 0);
if(lump == nil) {
fprint(2, "clump %llud failed to read: %r\n", aa);
break;
}
if(cl.info.type != VtTypeCorrupt) {
scoremem(score, lump->data, cl.info.uncsize);
if(scorecmp(cl.info.score, score) != 0) {
fprint(2, "clump %llud has mismatched score\n", aa);
break;
}
if(vttypevalid(cl.info.type) < 0) {
fprint(2, "clump %llud has bad type %d\n", aa, cl.info.type);
break;
}
}
if(z && vtwrite(z, score, cl.info.type, lump->data, cl.info.uncsize) < 0)
sysfatal("failed writing clump %llud: %r", aa);
freezblock(lump);
}
if(z && vtsync(z) < 0)
sysfatal("failed executing sync: %r");
print("end offset %llud\n", aa);
}
void
threadmain(int argc, char *argv[])
{
char *file;
VtConn *z;
Arena *arena;
u64int offset, aoffset;
Part *part;
Dir *d;
uchar buf[8192];
ArenaHead head;
aoffset = 0;
ARGBEGIN{
case 'h':
host = EARGF(usage());
break;
case 'o':
aoffset = strtoull(EARGF(usage()), 0, 0);
break;
default:
usage();
break;
}ARGEND
offset = ~(u64int)0;
switch(argc) {
default:
usage();
case 2:
offset = strtoull(argv[1], 0, 0);
/* fall through */
case 1:
file = argv[0];
}
fmtinstall('V', vtscorefmt);
statsinit();
if((d = dirstat(file)) == nil)
sysfatal("can't stat file %s: %r", file);
part = initpart(file, 0);
if(part == nil)
sysfatal("can't open file %s: %r", file);
if(readpart(part, aoffset, buf, sizeof buf) < 0)
sysfatal("can't read file %s: %r", file);
if(unpackarenahead(&head, buf) < 0)
sysfatal("corrupted arena header: %r");
if(aoffset+head.size > d->length)
sysfatal("arena is truncated: want %llud bytes have %llud\n",
head.size, d->length);
partblocksize(part, head.blocksize);
initdcache(8 * MaxDiskBlock);
arena = initarena(part, aoffset, head.size, head.blocksize);
if(arena == nil)
sysfatal("initarena: %r");
if(host && strcmp(host, "/dev/null") != 0){
z = vtdial(host);
if(z == nil)
sysfatal("could not connect to server: %r");
if(vtconnect(z) < 0)
sysfatal("vtconnect: %r");
}else
z = nil;
rdarena(z, arena, offset);
vthangup(z);
threadexitsall(0);
}
|