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 3d77c87e 2004-03-15 devnull static VacFs *
  9 3d77c87e 2004-03-15 devnull vacfsalloc(VtConn *z, int bsize, int ncache, int mode)
 10 7763a61a 2003-11-23 devnull {
 11 3d77c87e 2004-03-15 devnull 	VacFs *fs;
 12 7763a61a 2003-11-23 devnull 
 13 3d77c87e 2004-03-15 devnull 	fs = vtmallocz(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 3d77c87e 2004-03-15 devnull 	fs->cache = vtcachealloc(z, bsize, ncache, mode);
 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 3d77c87e 2004-03-15 devnull readscore(int fd, uchar score[VtScoreSize])
 23 7763a61a 2003-11-23 devnull {
 24 3d77c87e 2004-03-15 devnull 	char buf[45], *pref;
 25 3d77c87e 2004-03-15 devnull 	int n;
 26 7763a61a 2003-11-23 devnull 
 27 3d77c87e 2004-03-15 devnull 	n = readn(fd, buf, sizeof(buf)-1);
 28 a20a1468 2005-01-16 devnull 	if(n < sizeof(buf)-1) {
 29 3d77c87e 2004-03-15 devnull 		werrstr("short read");
 30 3d77c87e 2004-03-15 devnull 		return -1;
 31 7763a61a 2003-11-23 devnull 	}
 32 3d77c87e 2004-03-15 devnull 	buf[n] = 0;
 33 3d77c87e 2004-03-15 devnull 
 34 3d77c87e 2004-03-15 devnull 	if(vtparsescore(buf, &pref, score) < 0){
 35 3d77c87e 2004-03-15 devnull 		werrstr(EBadVacFormat);
 36 3d77c87e 2004-03-15 devnull 		return -1;
 37 7763a61a 2003-11-23 devnull 	}
 38 3d77c87e 2004-03-15 devnull 	if(pref==nil || strcmp(pref, "vac") != 0) {
 39 3d77c87e 2004-03-15 devnull 		werrstr("not a vac file");
 40 3d77c87e 2004-03-15 devnull 		return -1;
 41 7763a61a 2003-11-23 devnull 	}
 42 3d77c87e 2004-03-15 devnull 	return 0;
 43 7763a61a 2003-11-23 devnull }
 44 7763a61a 2003-11-23 devnull 
 45 3d77c87e 2004-03-15 devnull VacFs*
 46 3d77c87e 2004-03-15 devnull vacfsopen(VtConn *z, char *file, int mode, int ncache)
 47 7763a61a 2003-11-23 devnull {
 48 3d77c87e 2004-03-15 devnull 	int fd;
 49 3d77c87e 2004-03-15 devnull 	uchar score[VtScoreSize];
 50 7763a61a 2003-11-23 devnull 
 51 7763a61a 2003-11-23 devnull 	fd = open(file, OREAD);
 52 3d77c87e 2004-03-15 devnull 	if(fd < 0)
 53 7763a61a 2003-11-23 devnull 		return nil;
 54 7763a61a 2003-11-23 devnull 
 55 3d77c87e 2004-03-15 devnull 	if(readscore(fd, score) < 0){
 56 7763a61a 2003-11-23 devnull 		close(fd);
 57 7763a61a 2003-11-23 devnull 		return nil;
 58 7763a61a 2003-11-23 devnull 	}
 59 7763a61a 2003-11-23 devnull 	close(fd);
 60 7763a61a 2003-11-23 devnull 
 61 3d77c87e 2004-03-15 devnull 	return vacfsopenscore(z, score, mode, ncache);
 62 3d77c87e 2004-03-15 devnull }
 63 3d77c87e 2004-03-15 devnull 
 64 3d77c87e 2004-03-15 devnull VacFs*
 65 3d77c87e 2004-03-15 devnull vacfsopenscore(VtConn *z, u8int *score, int mode, int ncache)
 66 3d77c87e 2004-03-15 devnull {
 67 3d77c87e 2004-03-15 devnull 	VacFs *fs;
 68 3d77c87e 2004-03-15 devnull 	int n;
 69 3d77c87e 2004-03-15 devnull 	VtRoot rt;
 70 3d77c87e 2004-03-15 devnull 	uchar buf[VtRootSize];
 71 3d77c87e 2004-03-15 devnull 	VacFile *root;
 72 3d77c87e 2004-03-15 devnull 	VtFile *r;
 73 3d77c87e 2004-03-15 devnull 	VtEntry e;
 74 3d77c87e 2004-03-15 devnull 
 75 3d77c87e 2004-03-15 devnull 	n = vtread(z, score, VtRootType, buf, VtRootSize);
 76 7763a61a 2003-11-23 devnull 	if(n < 0)
 77 7763a61a 2003-11-23 devnull 		return nil;
 78 3d77c87e 2004-03-15 devnull 	if(n != VtRootSize){
 79 3d77c87e 2004-03-15 devnull 		werrstr("vtread on root too short");
 80 7763a61a 2003-11-23 devnull 		return nil;
 81 7763a61a 2003-11-23 devnull 	}
 82 7763a61a 2003-11-23 devnull 
 83 3d77c87e 2004-03-15 devnull 	if(vtrootunpack(&rt, buf) < 0)
 84 7763a61a 2003-11-23 devnull 		return nil;
 85 7763a61a 2003-11-23 devnull 
 86 7763a61a 2003-11-23 devnull 	if(strcmp(rt.type, "vac") != 0) {
 87 3d77c87e 2004-03-15 devnull 		werrstr("not a vac root");
 88 7763a61a 2003-11-23 devnull 		return nil;
 89 7763a61a 2003-11-23 devnull 	}
 90 7763a61a 2003-11-23 devnull 
 91 3d77c87e 2004-03-15 devnull 	fs = vacfsalloc(z, rt.blocksize, ncache, mode);
 92 7763a61a 2003-11-23 devnull 	memmove(fs->score, score, VtScoreSize);
 93 3d77c87e 2004-03-15 devnull 	fs->mode = mode;
 94 3d77c87e 2004-03-15 devnull 
 95 a20a1468 2005-01-16 devnull 	memmove(e.score, rt.score, VtScoreSize);
 96 3d77c87e 2004-03-15 devnull 	e.gen = 0;
 97 3d77c87e 2004-03-15 devnull 	e.psize = (rt.blocksize/VtEntrySize)*VtEntrySize;
 98 3d77c87e 2004-03-15 devnull 	e.dsize = rt.blocksize;
 99 3d77c87e 2004-03-15 devnull 	e.type = VtDirType;
100 3d77c87e 2004-03-15 devnull 	e.flags = VtEntryActive;
101 3d77c87e 2004-03-15 devnull 	e.size = 3*VtEntrySize;
102 3d77c87e 2004-03-15 devnull 
103 3d77c87e 2004-03-15 devnull 	root = nil;
104 3d77c87e 2004-03-15 devnull 	if((r = vtfileopenroot(fs->cache, &e)) == nil)
105 3d77c87e 2004-03-15 devnull 		goto Err;
106 3d77c87e 2004-03-15 devnull 
107 3d77c87e 2004-03-15 devnull 	root = _vacfileroot(fs, r);
108 3d77c87e 2004-03-15 devnull 	vtfileclose(r);
109 7763a61a 2003-11-23 devnull 	if(root == nil)
110 7763a61a 2003-11-23 devnull 		goto Err;
111 7763a61a 2003-11-23 devnull 	fs->root = root;
112 7763a61a 2003-11-23 devnull 
113 7763a61a 2003-11-23 devnull 	return fs;
114 7763a61a 2003-11-23 devnull Err:
115 7763a61a 2003-11-23 devnull 	if(root)
116 3d77c87e 2004-03-15 devnull 		vacfiledecref(root);
117 3d77c87e 2004-03-15 devnull 	vacfsclose(fs);
118 7763a61a 2003-11-23 devnull 	return nil;
119 7763a61a 2003-11-23 devnull }
120 7763a61a 2003-11-23 devnull 
121 3d77c87e 2004-03-15 devnull VacFs *
122 3d77c87e 2004-03-15 devnull vacfscreate(VtConn *z, int bsize, int ncache)
123 7763a61a 2003-11-23 devnull {
124 3d77c87e 2004-03-15 devnull 	return vacfsalloc(z, bsize, ncache, VtORDWR);
125 7763a61a 2003-11-23 devnull }
126 7763a61a 2003-11-23 devnull 
127 7763a61a 2003-11-23 devnull int
128 3d77c87e 2004-03-15 devnull vacfsmode(VacFs *fs)
129 7763a61a 2003-11-23 devnull {
130 3d77c87e 2004-03-15 devnull 	return fs->mode;
131 7763a61a 2003-11-23 devnull }
132 7763a61a 2003-11-23 devnull 
133 3d77c87e 2004-03-15 devnull VacFile*
134 3d77c87e 2004-03-15 devnull vacfsgetroot(VacFs *fs)
135 7763a61a 2003-11-23 devnull {
136 3d77c87e 2004-03-15 devnull 	return vacfileincref(fs->root);
137 7763a61a 2003-11-23 devnull }
138 7763a61a 2003-11-23 devnull 
139 7763a61a 2003-11-23 devnull int
140 3d77c87e 2004-03-15 devnull vacfsgetblocksize(VacFs *fs)
141 7763a61a 2003-11-23 devnull {
142 7763a61a 2003-11-23 devnull 	return fs->bsize;
143 7763a61a 2003-11-23 devnull }
144 7763a61a 2003-11-23 devnull 
145 7763a61a 2003-11-23 devnull int
146 3d77c87e 2004-03-15 devnull vacfsgetscore(VacFs *fs, u8int *score)
147 7763a61a 2003-11-23 devnull {
148 3d77c87e 2004-03-15 devnull 	memmove(score, fs->score, VtScoreSize);
149 3d77c87e 2004-03-15 devnull 	return 0;
150 7763a61a 2003-11-23 devnull }
151 7763a61a 2003-11-23 devnull 
152 7763a61a 2003-11-23 devnull int
153 3d77c87e 2004-03-15 devnull _vacfsnextqid(VacFs *fs, uvlong *qid)
154 7763a61a 2003-11-23 devnull {
155 3d77c87e 2004-03-15 devnull 	++fs->qid;
156 3d77c87e 2004-03-15 devnull 	*qid = fs->qid;
157 3d77c87e 2004-03-15 devnull 	return 0;
158 7763a61a 2003-11-23 devnull }
159 7763a61a 2003-11-23 devnull 
160 7763a61a 2003-11-23 devnull int
161 3d77c87e 2004-03-15 devnull vacfssync(VacFs *fs)
162 7763a61a 2003-11-23 devnull {
163 3d77c87e 2004-03-15 devnull 	return 0;
164 7763a61a 2003-11-23 devnull }
165 7763a61a 2003-11-23 devnull 
166 3d77c87e 2004-03-15 devnull void
167 3d77c87e 2004-03-15 devnull vacfsclose(VacFs *fs)
168 7763a61a 2003-11-23 devnull {
169 7763a61a 2003-11-23 devnull 	if(fs->root)
170 3d77c87e 2004-03-15 devnull 		vacfiledecref(fs->root);
171 7763a61a 2003-11-23 devnull 	fs->root = nil;
172 3d77c87e 2004-03-15 devnull 	vtcachefree(fs->cache);
173 3d77c87e 2004-03-15 devnull 	vtfree(fs);
174 7763a61a 2003-11-23 devnull }
175 7763a61a 2003-11-23 devnull