1 7763a61a 2003-11-23 devnull #include "stdinc.h"
  2 7763a61a 2003-11-23 devnull #include "vac.h"
  3 7763a61a 2003-11-23 devnull #include "dat.h"
  4 7763a61a 2003-11-23 devnull #include "fns.h"
  5 7763a61a 2003-11-23 devnull 
  6 7763a61a 2003-11-23 devnull static char EBadVacFormat[] = "bad format for vac file";
  7 7763a61a 2003-11-23 devnull 
  8 7763a61a 2003-11-23 devnull static VacFS *
  9 7763a61a 2003-11-23 devnull vfsAlloc(VtSession *z, int bsize, long ncache)
 10 7763a61a 2003-11-23 devnull {
 11 7763a61a 2003-11-23 devnull 	VacFS *fs;
 12 7763a61a 2003-11-23 devnull 
 13 7763a61a 2003-11-23 devnull 	fs = vtMemAllocZ(sizeof(VacFS));
 14 7763a61a 2003-11-23 devnull 	fs->ref = 1;
 15 7763a61a 2003-11-23 devnull 	fs->z = z;
 16 7763a61a 2003-11-23 devnull 	fs->bsize = bsize;
 17 7763a61a 2003-11-23 devnull 	fs->cache = cacheAlloc(z, bsize, ncache);
 18 7763a61a 2003-11-23 devnull 	return fs;
 19 7763a61a 2003-11-23 devnull }
 20 7763a61a 2003-11-23 devnull 
 21 7763a61a 2003-11-23 devnull static int
 22 7763a61a 2003-11-23 devnull readScore(int fd, uchar score[VtScoreSize])
 23 7763a61a 2003-11-23 devnull {
 24 7763a61a 2003-11-23 devnull 	char buf[44];
 25 7763a61a 2003-11-23 devnull 	int i, n, c;
 26 7763a61a 2003-11-23 devnull 
 27 7763a61a 2003-11-23 devnull 	n = readn(fd, buf, sizeof(buf));
 28 7763a61a 2003-11-23 devnull 	if(n < sizeof(buf)) {
 29 7763a61a 2003-11-23 devnull 		vtSetError("short read");
 30 7763a61a 2003-11-23 devnull 		return 0;
 31 7763a61a 2003-11-23 devnull 	}
 32 7763a61a 2003-11-23 devnull 	if(strncmp(buf, "vac:", 4) != 0) {
 33 7763a61a 2003-11-23 devnull 		vtSetError("not a vac file");
 34 7763a61a 2003-11-23 devnull 		return 0;
 35 7763a61a 2003-11-23 devnull 	}
 36 7763a61a 2003-11-23 devnull 	memset(score, 0, VtScoreSize);
 37 7763a61a 2003-11-23 devnull 	for(i=4; i<sizeof(buf); i++) {
 38 7763a61a 2003-11-23 devnull 		if(buf[i] >= '0' && buf[i] <= '9')
 39 7763a61a 2003-11-23 devnull 			c = buf[i] - '0';
 40 7763a61a 2003-11-23 devnull 		else if(buf[i] >= 'a' && buf[i] <= 'f')
 41 7763a61a 2003-11-23 devnull 			c = buf[i] - 'a' + 10;
 42 7763a61a 2003-11-23 devnull 		else if(buf[i] >= 'A' && buf[i] <= 'F')
 43 7763a61a 2003-11-23 devnull 			c = buf[i] - 'A' + 10;
 44 7763a61a 2003-11-23 devnull 		else {
 45 7763a61a 2003-11-23 devnull 			vtSetError("bad format for venti score");
 46 7763a61a 2003-11-23 devnull 			return 0;
 47 7763a61a 2003-11-23 devnull 		}
 48 7763a61a 2003-11-23 devnull 		if((i & 1) == 0)
 49 7763a61a 2003-11-23 devnull 			c <<= 4;
 50 7763a61a 2003-11-23 devnull 	
 51 7763a61a 2003-11-23 devnull 		score[(i>>1)-2] |= c;
 52 7763a61a 2003-11-23 devnull 	}
 53 7763a61a 2003-11-23 devnull 	return 1;
 54 7763a61a 2003-11-23 devnull }
 55 7763a61a 2003-11-23 devnull 
 56 7763a61a 2003-11-23 devnull VacFS *
 57 7763a61a 2003-11-23 devnull vfsOpen(VtSession *z, char *file, int readOnly, long ncache)
 58 7763a61a 2003-11-23 devnull {
 59 7763a61a 2003-11-23 devnull 	VacFS *fs;
 60 7763a61a 2003-11-23 devnull 	int n, fd;
 61 7763a61a 2003-11-23 devnull 	VtRoot rt;
 62 7763a61a 2003-11-23 devnull 	uchar score[VtScoreSize], buf[VtRootSize];
 63 7763a61a 2003-11-23 devnull 	VacFile *root;
 64 7763a61a 2003-11-23 devnull 
 65 7763a61a 2003-11-23 devnull 	fd = open(file, OREAD);
 66 7763a61a 2003-11-23 devnull 	if(fd < 0) {
 67 7763a61a 2003-11-23 devnull 		vtOSError();
 68 7763a61a 2003-11-23 devnull 		return nil;
 69 7763a61a 2003-11-23 devnull 	}
 70 7763a61a 2003-11-23 devnull 
 71 7763a61a 2003-11-23 devnull 	if(!readScore(fd, score)) {
 72 7763a61a 2003-11-23 devnull 		close(fd);
 73 7763a61a 2003-11-23 devnull 		return nil;
 74 7763a61a 2003-11-23 devnull 	}
 75 7763a61a 2003-11-23 devnull 	close(fd);
 76 7763a61a 2003-11-23 devnull 
 77 7763a61a 2003-11-23 devnull 	n = vtRead(z, score, VtRootType, buf, VtRootSize);
 78 7763a61a 2003-11-23 devnull 	if(n < 0)
 79 7763a61a 2003-11-23 devnull 		return nil;
 80 7763a61a 2003-11-23 devnull 	if(n != VtRootSize) {
 81 7763a61a 2003-11-23 devnull 		vtSetError("vtRead on root too short");
 82 7763a61a 2003-11-23 devnull 		return nil;
 83 7763a61a 2003-11-23 devnull 	}
 84 7763a61a 2003-11-23 devnull 
 85 7763a61a 2003-11-23 devnull 	if(!vtSha1Check(score, buf, VtRootSize)) {
 86 7763a61a 2003-11-23 devnull 		vtSetError("vtSha1Check failed on root block");	
 87 7763a61a 2003-11-23 devnull 		return nil;
 88 7763a61a 2003-11-23 devnull 	}
 89 7763a61a 2003-11-23 devnull 
 90 7763a61a 2003-11-23 devnull 	if(!vtRootUnpack(&rt, buf))
 91 7763a61a 2003-11-23 devnull 		return nil;
 92 7763a61a 2003-11-23 devnull 
 93 7763a61a 2003-11-23 devnull 	if(strcmp(rt.type, "vac") != 0) {
 94 7763a61a 2003-11-23 devnull 		vtSetError("not a vac root");
 95 7763a61a 2003-11-23 devnull 		return nil;
 96 7763a61a 2003-11-23 devnull 	}
 97 7763a61a 2003-11-23 devnull 
 98 7763a61a 2003-11-23 devnull 	fs = vfsAlloc(z, rt.blockSize, ncache);
 99 7763a61a 2003-11-23 devnull 	memmove(fs->score, score, VtScoreSize);
100 7763a61a 2003-11-23 devnull 	fs->readOnly = readOnly;
101 7763a61a 2003-11-23 devnull 	root = vfRoot(fs, rt.score);
102 7763a61a 2003-11-23 devnull 	if(root == nil)
103 7763a61a 2003-11-23 devnull 		goto Err;
104 7763a61a 2003-11-23 devnull 	fs->root = root;
105 7763a61a 2003-11-23 devnull 
106 7763a61a 2003-11-23 devnull 	return fs;
107 7763a61a 2003-11-23 devnull Err:
108 7763a61a 2003-11-23 devnull 	if(root)
109 7763a61a 2003-11-23 devnull 		vfDecRef(root);
110 7763a61a 2003-11-23 devnull 	vfsClose(fs);
111 7763a61a 2003-11-23 devnull 	return nil;
112 7763a61a 2003-11-23 devnull }
113 7763a61a 2003-11-23 devnull 
114 7763a61a 2003-11-23 devnull VacFS *
115 7763a61a 2003-11-23 devnull vacFsCreate(VtSession *z, int bsize, long ncache)
116 7763a61a 2003-11-23 devnull {
117 7763a61a 2003-11-23 devnull 	VacFS *fs;
118 7763a61a 2003-11-23 devnull 
119 7763a61a 2003-11-23 devnull 	fs = vfsAlloc(z, bsize, ncache);
120 7763a61a 2003-11-23 devnull 	return fs;
121 7763a61a 2003-11-23 devnull }
122 7763a61a 2003-11-23 devnull 
123 7763a61a 2003-11-23 devnull int
124 7763a61a 2003-11-23 devnull vfsIsReadOnly(VacFS *fs)
125 7763a61a 2003-11-23 devnull {
126 7763a61a 2003-11-23 devnull 	return fs->readOnly != 0;
127 7763a61a 2003-11-23 devnull }
128 7763a61a 2003-11-23 devnull 
129 7763a61a 2003-11-23 devnull VacFile *
130 7763a61a 2003-11-23 devnull vfsGetRoot(VacFS *fs)
131 7763a61a 2003-11-23 devnull {
132 7763a61a 2003-11-23 devnull 	return vfIncRef(fs->root);
133 7763a61a 2003-11-23 devnull }
134 7763a61a 2003-11-23 devnull 
135 7763a61a 2003-11-23 devnull int
136 7763a61a 2003-11-23 devnull vfsGetBlockSize(VacFS *fs)
137 7763a61a 2003-11-23 devnull {
138 7763a61a 2003-11-23 devnull 	return fs->bsize;
139 7763a61a 2003-11-23 devnull }
140 7763a61a 2003-11-23 devnull 
141 7763a61a 2003-11-23 devnull int
142 7763a61a 2003-11-23 devnull vfsGetScore(VacFS *fs, uchar score[VtScoreSize])
143 7763a61a 2003-11-23 devnull {
144 7763a61a 2003-11-23 devnull 	memmove(fs, score, VtScoreSize);
145 7763a61a 2003-11-23 devnull 	return 1;
146 7763a61a 2003-11-23 devnull }
147 7763a61a 2003-11-23 devnull 
148 7763a61a 2003-11-23 devnull long
149 7763a61a 2003-11-23 devnull vfsGetCacheSize(VacFS *fs)
150 7763a61a 2003-11-23 devnull {
151 7763a61a 2003-11-23 devnull 	return cacheGetSize(fs->cache);
152 7763a61a 2003-11-23 devnull }
153 7763a61a 2003-11-23 devnull 
154 7763a61a 2003-11-23 devnull int
155 7763a61a 2003-11-23 devnull vfsSetCacheSize(VacFS *fs, long size)
156 7763a61a 2003-11-23 devnull {
157 7763a61a 2003-11-23 devnull 	return cacheSetSize(fs->cache, size);
158 7763a61a 2003-11-23 devnull }
159 7763a61a 2003-11-23 devnull 
160 7763a61a 2003-11-23 devnull int
161 7763a61a 2003-11-23 devnull vfsSnapshot(VacFS *fs, char *src, char *dst)
162 7763a61a 2003-11-23 devnull {
163 7763a61a 2003-11-23 devnull 	USED(fs);
164 7763a61a 2003-11-23 devnull 	USED(src);
165 7763a61a 2003-11-23 devnull 	USED(dst);
166 7763a61a 2003-11-23 devnull 	return 1;
167 7763a61a 2003-11-23 devnull }
168 7763a61a 2003-11-23 devnull 
169 7763a61a 2003-11-23 devnull int
170 7763a61a 2003-11-23 devnull vfsSync(VacFS*)
171 7763a61a 2003-11-23 devnull {
172 7763a61a 2003-11-23 devnull 	return 1;
173 7763a61a 2003-11-23 devnull }
174 7763a61a 2003-11-23 devnull 
175 7763a61a 2003-11-23 devnull int
176 7763a61a 2003-11-23 devnull vfsClose(VacFS *fs)
177 7763a61a 2003-11-23 devnull {
178 7763a61a 2003-11-23 devnull 	if(fs->root)
179 7763a61a 2003-11-23 devnull 		vfDecRef(fs->root);
180 7763a61a 2003-11-23 devnull 	fs->root = nil;
181 7763a61a 2003-11-23 devnull 	cacheCheck(fs->cache);
182 7763a61a 2003-11-23 devnull 	cacheFree(fs->cache);
183 7763a61a 2003-11-23 devnull 	memset(fs, 0, sizeof(VacFS));
184 7763a61a 2003-11-23 devnull 	vtMemFree(fs);
185 7763a61a 2003-11-23 devnull 	return 1;
186 7763a61a 2003-11-23 devnull }
187 7763a61a 2003-11-23 devnull 
188 7763a61a 2003-11-23 devnull