1996/0218/port/devtinyfs.c (diff list | history)

1996/0217/sys/src/9/port/devtinyfs.c:150,156 – 1996/0218/sys/src/9/port/devtinyfs.c:150,156 (short | long | prev | next)
1996/0201		if(checksum(p) != 0) return 0; if(buf[0] != Tagdir)
1996/0218		if(p[0] != Tagdir)
1996/0201		return 0; md = (Mdir*)p; x = GETS(md->bno);
1996/0217/sys/src/9/port/devtinyfs.c:167,174 – 1996/0218/sys/src/9/port/devtinyfs.c:167,174
1996/0201		if(checksum(p) != 0) return 0; md = (Mdir*)p; switch(buf[0]){
1996/0218		md = (Mdata*)p; switch(md->type){
1996/0201		case Tagdata: x = GETS(md->bno); if(x >= fs->nblocks)
1996/0217/sys/src/9/port/devtinyfs.c:190,214 – 1996/0218/sys/src/9/port/devtinyfs.c:190,236
1996/0206		static Mdata*
1996/0217		readdata(Tfs *fs, ulong bno, uchar *buf, int *lenp)
1996/0206		{
1996/0217		Mdata *md;
1996/0206		if(bno >= fs->nblocks) return 0; n = devtab[fs->c->type].read(fs->c, buf, Blen, Blen*bno); if(n != Blen) return 0;
1996/0218		if(devtab[fs->c->type].read(fs->c, buf, Blen, Blen*bno) != Blen) error(Eio);
1996/0217		return validdata(fs, buf, lenp);
1996/0206		}
1996/0202		static int
1996/0218		static void writedata(Tfs *fs, ulong bno, ulong next, uchar *buf, int len, int last) { Mdata md; if(bno >= fs->nblocks) error(Eio); if(len > Dlen) len = Dlen; if(len < 0) error(Eio); memset(&md, 0, sizeof(md)); if(last){ md.type = Tagend; PUTS(md.bno, len); } else { md.type = Tagdata; PUTS(md.bno, next); } memmove(md.data, buf, len); md.sum = 0 - checksum((uchar*)&md); if(devtab[fs->c->type].write(fs->c, &md, Blen, Blen*bno) != Blen) error(Eio); } static void
1996/0202		writedir(Tfs *fs, Tfile *f) { Mdir *md; int n; uchar buf[Blen]; if(f->bno == Notabno) return Blen;
1996/0218		return;
1996/0202		md = (Mdir*)buf; memset(buf, 0, Blen);
1996/0217/sys/src/9/port/devtinyfs.c:216,224 – 1996/0218/sys/src/9/port/devtinyfs.c:238,247
1996/0202		strncpy(md->name, f->name, sizeof(md->name)-1); PUTS(md->bno, f->dbno); PUTS(md->pin, f->pin); f->sum = 0 - checksum(buf);
1996/0218		md->sum = 0 - checksum(buf);
1996/0202		return devtab[fs->c->type].write(fs->c, buf, Blen, Blen*f->bno);
1996/0218		if(devtab[fs->c->type].write(fs->c, buf, Blen, Blen*f->bno) != Blen) error(Eio);
1996/0202		}
1996/0201		static void
1996/0217/sys/src/9/port/devtinyfs.c:277,282 – 1996/0218/sys/src/9/port/devtinyfs.c:300,306
1996/0202		Tfile *f; /* find free entry in file table */
1996/0218		f = 0;
1996/0202		for(;;) { for(i = 0; i < fs->fsize; i++){ f = &fs->f[i];
1996/0217/sys/src/9/port/devtinyfs.c:298,307 – 1996/0218/sys/src/9/port/devtinyfs.c:322,331
1996/0202		/* write directory block */ if(waserror()){ filefree(fs, f, Notabno);
1996/0218		freefile(fs, f, Notabno);
1996/0202		nexterror(); } if(b->bno == Notabno)
1996/0218		if(f->bno == Notabno)
1996/0202		error("out of space"); writedir(fs, f); poperror();
1996/0217/sys/src/9/port/devtinyfs.c:317,332 – 1996/0218/sys/src/9/port/devtinyfs.c:341,357
1996/0201		static void fsinit(Tfs *fs)
1996/0123		{
1996/0131		uchar buf[Blen+DIRLEN];
1996/0218		char dbuf[DIRLEN];
1996/0123		Dir d;
1996/0218		uchar buf[Blen];
1996/0131		ulong x, bno;
1996/0217		int n, done;
1996/0201		Tfile *f; Mdir *mdir; Mdata *mdat;
1996/0218		Mdata *mdata;
1996/0123		devtab[fs->c->type].stat(fs->c, buf); convM2D(buf, &d);
1996/0218		devtab[fs->c->type].stat(fs->c, dbuf); convM2D(dbuf, &d);
1996/0131		fs->nblocks = d.length/Blen; if(fs->nblocks < 3)
1996/0123		error("tinyfs medium too small");
1996/0217/sys/src/9/port/devtinyfs.c:344,354 – 1996/0218/sys/src/9/port/devtinyfs.c:369,379
1996/0131		if(n != Blen) break;
1996/0201		mdir = validdir(buf);
1996/0218		mdir = validdir(fs, buf);
1996/0201		if(mdir == 0)
1996/0131		continue;
1996/0201
1996/0217		if(fs->nfs >= fs->fsize)
1996/0218		if(fs->nf >= fs->fsize)
1996/0201		expand(fs);
1996/0202
1996/0201		f = &fs->f[fs->nf++];
1996/0217/sys/src/9/port/devtinyfs.c:363,372 – 1996/0218/sys/src/9/port/devtinyfs.c:388,397
1996/0201		/* follow files */
1996/0217		for(f = fs->f; f < &(fs->f[fs->nf]); f++){
1996/0201		bno = fs->dbno;
1996/0218		bno = f->dbno;
1996/0217		for(done = 0; !done;) {
1996/0201		if(isalloced(fs, bno)){ freefile(f, bno);
1996/0218		freefile(fs, f, bno);
1996/0201		break; } n = devtab[fs->c->type].read(fs->c, buf, Blen, Blen*bno);
1996/0217/sys/src/9/port/devtinyfs.c:383,392 – 1996/0218/sys/src/9/port/devtinyfs.c:408,417
1996/0201		switch(mdata->type){ case Tagdata: bno = GETS(mdata->bno); f->len += Dlen;
1996/0218		f->length += Dlen;
1996/0201		break; case Tagend: f->len += GETS(mdata->bno);
1996/0218		f->length += GETS(mdata->bno);
1996/0217		done = 1;
1996/0201		break; }
1996/0217/sys/src/9/port/devtinyfs.c:406,411 – 1996/0218/sys/src/9/port/devtinyfs.c:431,438
1996/0201		Tfile *f; Qid qid;
1996/0123
1996/0218		USED(ntab, tab);
1996/0201		fs = &tinyfs.fs[c->dev]; if(i >= fs->nf) return -1;
1996/0217/sys/src/9/port/devtinyfs.c:435,441 – 1996/0218/sys/src/9/port/devtinyfs.c:462,468
1996/0122		Chan *c, *cc;
1996/0201		int i;
1996/0120
1996/0122		cc = namec((char*)arg[0], Aopen, arg[1], 0);
1996/0218		cc = namec(spec, Aopen, ORDWR, 0);
1996/0123		if(waserror()){ close(cc);
1996/0201		qunlock(&tinyfs);
1996/0217/sys/src/9/port/devtinyfs.c:443,451 – 1996/0218/sys/src/9/port/devtinyfs.c:470,479
1996/0123		}
1996/0201
1996/0122		qlock(&tinyfs);
1996/0218		fs = 0;
1996/0201		for(i = 0; i < tinyfs.nfs; i++){ fs = &tinyfs.fs[i]; if(fs && eqchan(c, fs->c))
1996/0218		if(fs && eqchan(cc, fs->c, 0))
1996/0122		break; }
1996/0201		if(i < tinyfs.nfs){
1996/0217/sys/src/9/port/devtinyfs.c:477,482 – 1996/0218/sys/src/9/port/devtinyfs.c:505,514
1996/0116		Chan * tinyfsclone(Chan *c, Chan *nc) {
1996/0218		Tfs *fs; fs = &tinyfs.fs[c->dev];
1996/0202		qlock(fs); fs->r++; qunlock(fs);
1996/0217/sys/src/9/port/devtinyfs.c:488,494 – 1996/0218/sys/src/9/port/devtinyfs.c:520,529
1996/0116		tinyfswalk(Chan *c, char *name) {
1996/0202		int n;
1996/0218		Tfs *fs;
1996/0202
1996/0218		fs = &tinyfs.fs[c->dev];
1996/0202		qlock(fs); n = devwalk(c, name, 0, 0, tinyfsgen); if(n != 0 && c->qid.path != CHDIR){
1996/0217/sys/src/9/port/devtinyfs.c:513,525 – 1996/0218/sys/src/9/port/devtinyfs.c:548,560
1996/0201		fs = &tinyfs.fs[c->dev]; if(c->path & CHDIR){
1996/0218		if(c->qid.path & CHDIR){
1996/0201		if(omode != OREAD) error(Eperm); } else {
1996/0202		qlock(fs); if(omode == (OTRUNC|ORDWR)){ f = newfile(fs, fs->f[c->qid.path]);
1996/0218		f = newfile(fs, fs->f[c->qid.path].name);
1996/0202		c->qid.path = f - fs->f; } else if(omode != OREAD){ qunlock(fs);
1996/0217/sys/src/9/port/devtinyfs.c:540,545 – 1996/0218/sys/src/9/port/devtinyfs.c:575,582
1996/0116		if(perm & CHDIR) error("directory creation illegal");
1996/0218		fs = &tinyfs.fs[c->dev];
1996/0202		qlock(fs); f = newfile(fs, name); qunlock(fs);
1996/0217/sys/src/9/port/devtinyfs.c:570,576 – 1996/0218/sys/src/9/port/devtinyfs.c:607,613
1996/0201		Tfile *f, *nf;
1996/0202		int i;
1996/0201		fs = c->aux;
1996/0218		fs = &tinyfs.fs[c->dev];
1996/0201
1996/0202		qlock(fs);
1996/0201
1996/0217/sys/src/9/port/devtinyfs.c:594,600 – 1996/0218/sys/src/9/port/devtinyfs.c:631,637
1996/0203		} f->flag &= ~(Frmonclose|Fcreating);
1996/0202		}
1996/0203		if(f->flag & Frmonclose){
1996/0218		if(f->flag & Frmonclose)
1996/0203		freefile(fs, f, Notabno);
1996/0202		} }
1996/0217/sys/src/9/port/devtinyfs.c:601,609 – 1996/0218/sys/src/9/port/devtinyfs.c:638,646
1996/0202		/* dereference fs and remove on zero refs */ fs->r--;
1996/0203		unlock(fs);
1996/0218		qunlock(fs);
1996/0203		qlock(&tinyfs);
1996/0201		if(fs->ref == 0){
1996/0218		if(fs->r == 0){
1996/0201		for(l = &fs->l; *l;){ if(*l == fs){ *l = fs->next;
1996/0217/sys/src/9/port/devtinyfs.c:625,631 – 1996/0218/sys/src/9/port/devtinyfs.c:662,668
1996/0203		Tfs *fs; Tfile *f; int sofar, i;
1996/0206		ulong bno, tbno;
1996/0218		ulong bno;
1996/0206		Mdata *md; uchar buf[Blen];
1996/0217		uchar *p = a;
1996/0217/sys/src/9/port/devtinyfs.c:644,651 – 1996/0218/sys/src/9/port/devtinyfs.c:681,686
1996/0206		bno = f->dbno;
1996/0217		for(sofar = 0; sofar + Blen < offset; sofar += Blen){ md = readdata(fs, bno, buf, 0);
1996/0206		if(md == 0) error(Eio); bno = GETS(md->bno); }
1996/0217/sys/src/9/port/devtinyfs.c:653,660 – 1996/0218/sys/src/9/port/devtinyfs.c:688,693
1996/0217		offset = offset%Blen; for(sofar = 0; sofar < n; sofar += i){ md = readdata(fs, bno, buf, &i); if(md == 0) error(Eio); i -= offset; if(i > n) i = n;
1996/0217/sys/src/9/port/devtinyfs.c:680,686 – 1996/0218/sys/src/9/port/devtinyfs.c:713,719
1996/0116		{
1996/0217		Tfs *fs; Tfile *f; int sofar, i;
1996/0218		int sofar, i, x;
1996/0217		ulong bno, tbno; Mdata *md; uchar buf[Blen];
1996/0217/sys/src/9/port/devtinyfs.c:689,719 – 1996/0218/sys/src/9/port/devtinyfs.c:722,787
1996/0217		if(c->qid.path & CHDIR) error(Eperm);
1996/0218		if(n == 0) return 0;
1996/0217		fs = tinyfs.fs[c->dev]; f = &fs->f[c->qid.path]; /* walk to first data block */
1996/0218		/* files are append only, anything else is illegal */ if(offset != f->length) error("append only"); qlock(fs); if(waserror()){ f->flag |= Frmonclose; qunlock(fs); nexterror(); } /* walk to last data block */
1996/0217		bno = f->dbno; for(sofar = 0; sofar + Blen < offset; sofar += Blen){ md = readdata(fs, bno, buf, 0); if(md == 0) error(Eio);
1996/0218		if(md->type == Tagend) break;
1996/0217		bno = GETS(md->bno);
1996/0116		}
1996/0217		/* write data */ offset = offset%Blen; for(sofar = 0; sofar < n; sofar += i){ md = readdata(fs, bno, buf, 0); if(md == 0) error(Eio); i = Blen - offset; if(i > n) i = n; memmove(p, a, i); bno = GETS(md->bno); offset = 0;
1996/0218		sofar = 0; i = offset%Dlen; if(i){ x = n; if(i + x > Dlen) x = Dlen - i; memmove(md->data + i, p, sofar); f->length += x; sofar += x;
1996/0116		}
1996/0218		while(x = n - sofar) { tbno = mapalloc(fs); if(f->length == 0){ f->dbno = tbno; writedir(fs, f); } else { writedata(fs, bno, tbno, md->data, Dlen, 0); } if(x > Dlen) x = Dlen; memmove(md->data, p + sofar, x); sofar += x; f->length += x; bno = tbno; } i = f->length%Dlen; if(i == 0) i = Dlen; writedata(fs, bno, tbno, md->data, i, 1); poperror(); qunlock(fs);
1996/0217		return sofar;
1996/0116		}