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 23fb2edb 2005-07-24 devnull #define debug 0
  7 23fb2edb 2005-07-24 devnull 
  8 7763a61a 2003-11-23 devnull static char EBadVacFormat[] = "bad format for vac file";
  9 7763a61a 2003-11-23 devnull 
 10 3d77c87e 2004-03-15 devnull static VacFs *
 11 3d77c87e 2004-03-15 devnull vacfsalloc(VtConn *z, int bsize, int ncache, int mode)
 12 7763a61a 2003-11-23 devnull {
 13 3d77c87e 2004-03-15 devnull 	VacFs *fs;
 14 7763a61a 2003-11-23 devnull 
 15 3d77c87e 2004-03-15 devnull 	fs = vtmallocz(sizeof(VacFs));
 16 7763a61a 2003-11-23 devnull 	fs->ref = 1;
 17 7763a61a 2003-11-23 devnull 	fs->z = z;
 18 7763a61a 2003-11-23 devnull 	fs->bsize = bsize;
 19 c1e6f642 2005-07-13 devnull 	fs->cache = vtcachealloc(z, bsize, ncache);
 20 7763a61a 2003-11-23 devnull 	return fs;
 21 7763a61a 2003-11-23 devnull }
 22 7763a61a 2003-11-23 devnull 
 23 7763a61a 2003-11-23 devnull static int
 24 3d77c87e 2004-03-15 devnull readscore(int fd, uchar score[VtScoreSize])
 25 7763a61a 2003-11-23 devnull {
 26 3d77c87e 2004-03-15 devnull 	char buf[45], *pref;
 27 3d77c87e 2004-03-15 devnull 	int n;
 28 7763a61a 2003-11-23 devnull 
 29 3d77c87e 2004-03-15 devnull 	n = readn(fd, buf, sizeof(buf)-1);
 30 a20a1468 2005-01-16 devnull 	if(n < sizeof(buf)-1) {
 31 3d77c87e 2004-03-15 devnull 		werrstr("short read");
 32 3d77c87e 2004-03-15 devnull 		return -1;
 33 7763a61a 2003-11-23 devnull 	}
 34 3d77c87e 2004-03-15 devnull 	buf[n] = 0;
 35 3d77c87e 2004-03-15 devnull 
 36 3d77c87e 2004-03-15 devnull 	if(vtparsescore(buf, &pref, score) < 0){
 37 3d77c87e 2004-03-15 devnull 		werrstr(EBadVacFormat);
 38 3d77c87e 2004-03-15 devnull 		return -1;
 39 7763a61a 2003-11-23 devnull 	}
 40 3d77c87e 2004-03-15 devnull 	if(pref==nil || strcmp(pref, "vac") != 0) {
 41 3d77c87e 2004-03-15 devnull 		werrstr("not a vac file");
 42 3d77c87e 2004-03-15 devnull 		return -1;
 43 7763a61a 2003-11-23 devnull 	}
 44 3d77c87e 2004-03-15 devnull 	return 0;
 45 7763a61a 2003-11-23 devnull }
 46 7763a61a 2003-11-23 devnull 
 47 3d77c87e 2004-03-15 devnull VacFs*
 48 3d77c87e 2004-03-15 devnull vacfsopen(VtConn *z, char *file, int mode, int ncache)
 49 7763a61a 2003-11-23 devnull {
 50 3d77c87e 2004-03-15 devnull 	int fd;
 51 3d77c87e 2004-03-15 devnull 	uchar score[VtScoreSize];
 52 7763a61a 2003-11-23 devnull 
 53 7763a61a 2003-11-23 devnull 	fd = open(file, OREAD);
 54 3d77c87e 2004-03-15 devnull 	if(fd < 0)
 55 7763a61a 2003-11-23 devnull 		return nil;
 56 7763a61a 2003-11-23 devnull 
 57 3d77c87e 2004-03-15 devnull 	if(readscore(fd, score) < 0){
 58 7763a61a 2003-11-23 devnull 		close(fd);
 59 7763a61a 2003-11-23 devnull 		return nil;
 60 7763a61a 2003-11-23 devnull 	}
 61 7763a61a 2003-11-23 devnull 	close(fd);
 62 7763a61a 2003-11-23 devnull 
 63 3d77c87e 2004-03-15 devnull 	return vacfsopenscore(z, score, mode, ncache);
 64 3d77c87e 2004-03-15 devnull }
 65 3d77c87e 2004-03-15 devnull 
 66 3d77c87e 2004-03-15 devnull VacFs*
 67 3d77c87e 2004-03-15 devnull vacfsopenscore(VtConn *z, u8int *score, int mode, int ncache)
 68 3d77c87e 2004-03-15 devnull {
 69 3d77c87e 2004-03-15 devnull 	VacFs *fs;
 70 3d77c87e 2004-03-15 devnull 	int n;
 71 3d77c87e 2004-03-15 devnull 	VtRoot rt;
 72 3d77c87e 2004-03-15 devnull 	uchar buf[VtRootSize];
 73 3d77c87e 2004-03-15 devnull 	VacFile *root;
 74 3d77c87e 2004-03-15 devnull 	VtFile *r;
 75 3d77c87e 2004-03-15 devnull 	VtEntry e;
 76 3d77c87e 2004-03-15 devnull 
 77 3d77c87e 2004-03-15 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 3d77c87e 2004-03-15 devnull 	if(n != VtRootSize){
 81 3d77c87e 2004-03-15 devnull 		werrstr("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 3d77c87e 2004-03-15 devnull 	if(vtrootunpack(&rt, buf) < 0)
 86 7763a61a 2003-11-23 devnull 		return nil;
 87 7763a61a 2003-11-23 devnull 
 88 7763a61a 2003-11-23 devnull 	if(strcmp(rt.type, "vac") != 0) {
 89 3d77c87e 2004-03-15 devnull 		werrstr("not a vac root");
 90 7763a61a 2003-11-23 devnull 		return nil;
 91 7763a61a 2003-11-23 devnull 	}
 92 7763a61a 2003-11-23 devnull 
 93 3d77c87e 2004-03-15 devnull 	fs = vacfsalloc(z, rt.blocksize, ncache, mode);
 94 7763a61a 2003-11-23 devnull 	memmove(fs->score, score, VtScoreSize);
 95 3d77c87e 2004-03-15 devnull 	fs->mode = mode;
 96 3d77c87e 2004-03-15 devnull 
 97 a20a1468 2005-01-16 devnull 	memmove(e.score, rt.score, VtScoreSize);
 98 3d77c87e 2004-03-15 devnull 	e.gen = 0;
 99 3d77c87e 2004-03-15 devnull 	e.psize = (rt.blocksize/VtEntrySize)*VtEntrySize;
100 3d77c87e 2004-03-15 devnull 	e.dsize = rt.blocksize;
101 3d77c87e 2004-03-15 devnull 	e.type = VtDirType;
102 3d77c87e 2004-03-15 devnull 	e.flags = VtEntryActive;
103 3d77c87e 2004-03-15 devnull 	e.size = 3*VtEntrySize;
104 3d77c87e 2004-03-15 devnull 
105 3d77c87e 2004-03-15 devnull 	root = nil;
106 3d77c87e 2004-03-15 devnull 	if((r = vtfileopenroot(fs->cache, &e)) == nil)
107 3d77c87e 2004-03-15 devnull 		goto Err;
108 23fb2edb 2005-07-24 devnull 	if(debug)
109 23fb2edb 2005-07-24 devnull 		fprint(2, "r %p\n", r);
110 3d77c87e 2004-03-15 devnull 	root = _vacfileroot(fs, r);
111 23fb2edb 2005-07-24 devnull 	if(debug)
112 23fb2edb 2005-07-24 devnull 		fprint(2, "root %p\n", root);
113 3d77c87e 2004-03-15 devnull 	vtfileclose(r);
114 7763a61a 2003-11-23 devnull 	if(root == nil)
115 7763a61a 2003-11-23 devnull 		goto Err;
116 7763a61a 2003-11-23 devnull 	fs->root = root;
117 7763a61a 2003-11-23 devnull 	return fs;
118 7763a61a 2003-11-23 devnull Err:
119 7763a61a 2003-11-23 devnull 	if(root)
120 3d77c87e 2004-03-15 devnull 		vacfiledecref(root);
121 3d77c87e 2004-03-15 devnull 	vacfsclose(fs);
122 7763a61a 2003-11-23 devnull 	return nil;
123 7763a61a 2003-11-23 devnull }
124 7763a61a 2003-11-23 devnull 
125 3d77c87e 2004-03-15 devnull VacFs *
126 3d77c87e 2004-03-15 devnull vacfscreate(VtConn *z, int bsize, int ncache)
127 7763a61a 2003-11-23 devnull {
128 3d77c87e 2004-03-15 devnull 	return vacfsalloc(z, bsize, ncache, VtORDWR);
129 7763a61a 2003-11-23 devnull }
130 7763a61a 2003-11-23 devnull 
131 7763a61a 2003-11-23 devnull int
132 3d77c87e 2004-03-15 devnull vacfsmode(VacFs *fs)
133 7763a61a 2003-11-23 devnull {
134 3d77c87e 2004-03-15 devnull 	return fs->mode;
135 7763a61a 2003-11-23 devnull }
136 7763a61a 2003-11-23 devnull 
137 3d77c87e 2004-03-15 devnull VacFile*
138 3d77c87e 2004-03-15 devnull vacfsgetroot(VacFs *fs)
139 7763a61a 2003-11-23 devnull {
140 3d77c87e 2004-03-15 devnull 	return vacfileincref(fs->root);
141 7763a61a 2003-11-23 devnull }
142 7763a61a 2003-11-23 devnull 
143 7763a61a 2003-11-23 devnull int
144 3d77c87e 2004-03-15 devnull vacfsgetblocksize(VacFs *fs)
145 7763a61a 2003-11-23 devnull {
146 7763a61a 2003-11-23 devnull 	return fs->bsize;
147 7763a61a 2003-11-23 devnull }
148 7763a61a 2003-11-23 devnull 
149 7763a61a 2003-11-23 devnull int
150 3d77c87e 2004-03-15 devnull vacfsgetscore(VacFs *fs, u8int *score)
151 7763a61a 2003-11-23 devnull {
152 3d77c87e 2004-03-15 devnull 	memmove(score, fs->score, VtScoreSize);
153 3d77c87e 2004-03-15 devnull 	return 0;
154 7763a61a 2003-11-23 devnull }
155 7763a61a 2003-11-23 devnull 
156 7763a61a 2003-11-23 devnull int
157 3d77c87e 2004-03-15 devnull _vacfsnextqid(VacFs *fs, uvlong *qid)
158 7763a61a 2003-11-23 devnull {
159 3d77c87e 2004-03-15 devnull 	++fs->qid;
160 3d77c87e 2004-03-15 devnull 	*qid = fs->qid;
161 3d77c87e 2004-03-15 devnull 	return 0;
162 7763a61a 2003-11-23 devnull }
163 7763a61a 2003-11-23 devnull 
164 7763a61a 2003-11-23 devnull int
165 3d77c87e 2004-03-15 devnull vacfssync(VacFs *fs)
166 7763a61a 2003-11-23 devnull {
167 3d77c87e 2004-03-15 devnull 	return 0;
168 7763a61a 2003-11-23 devnull }
169 7763a61a 2003-11-23 devnull 
170 3d77c87e 2004-03-15 devnull void
171 3d77c87e 2004-03-15 devnull vacfsclose(VacFs *fs)
172 7763a61a 2003-11-23 devnull {
173 7763a61a 2003-11-23 devnull 	if(fs->root)
174 3d77c87e 2004-03-15 devnull 		vacfiledecref(fs->root);
175 7763a61a 2003-11-23 devnull 	fs->root = nil;
176 3d77c87e 2004-03-15 devnull 	vtcachefree(fs->cache);
177 3d77c87e 2004-03-15 devnull 	vtfree(fs);
178 7763a61a 2003-11-23 devnull }
179 7763a61a 2003-11-23 devnull