1996/0217/port/devtinyfs.c (diff list | history)

1996/0206/sys/src/9/port/devtinyfs.c:160,166 – 1996/0217/sys/src/9/port/devtinyfs.c:160,166 (short | long | prev | next)
1996/0201		} static Mdata* validdata(Tfs *fs, uchar *p)
1996/0217		validdata(Tfs *fs, uchar *p, int *lenp)
1996/0201		{ Mdata *md; ulong x;
1996/0206/sys/src/9/port/devtinyfs.c:173,183 – 1996/0217/sys/src/9/port/devtinyfs.c:173,187
1996/0201		x = GETS(md->bno); if(x >= fs->nblocks) return 0;
1996/0217		if(lenp) *lenp = Dlen;
1996/0201		break; case Tagend: x = GETS(md->bno); if(x > Blen - 4)
1996/0217		if(x > Dlen)
1996/0201		return 0;
1996/0217		if(lenp) *lenp = x;
1996/0201		break; } return md;
1996/0206/sys/src/9/port/devtinyfs.c:184,197 – 1996/0217/sys/src/9/port/devtinyfs.c:188,203
1996/0201		}
1996/0206		static Mdata* readdata(Tfs *fs, ulong bno, uchar *buf)
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; return validdata(fs, buf);
1996/0217		return validdata(fs, buf, lenp);
1996/0206		}
1996/0202		static int
1996/0206/sys/src/9/port/devtinyfs.c:230,236 – 1996/0217/sys/src/9/port/devtinyfs.c:236,242
1996/0201		n = devtab[fs->c->type].read(fs->c, buf, Blen, Blen*bno); if(n != Blen) break; md = validdata(buf);
1996/0217		md = validdata(fs, buf, 0);
1996/0201		if(md == 0) break; if(md->type == Tagend)
1996/0206/sys/src/9/port/devtinyfs.c:259,265 – 1996/0217/sys/src/9/port/devtinyfs.c:265,271
1996/0201		fs->fsize += 8; f = smalloc(fs->fsize*sizeof(*f)); memmove(f, fs->f, fs->nf*sizoef(f));
1996/0217		memmove(f, fs->f, fs->nf*sizeof(f));
1996/0201		free(fs->f); fs->f = f; }
1996/0206/sys/src/9/port/devtinyfs.c:305,311 – 1996/0217/sys/src/9/port/devtinyfs.c:311,318
1996/0202
1996/0123		/*
1996/0202		* Read the whole medium and build a file table and used * block bitmap. Inconsistent files are purged.
1996/0217		* block bitmap. Inconsistent files are purged. The medium * had better be small or this could take a while.
1996/0123		*/
1996/0201		static void fsinit(Tfs *fs)
1996/0206/sys/src/9/port/devtinyfs.c:313,319 – 1996/0217/sys/src/9/port/devtinyfs.c:320,326
1996/0131		uchar buf[Blen+DIRLEN];
1996/0123		Dir d;
1996/0131		ulong x, bno;
1996/0201		int n;
1996/0217		int n, done;
1996/0201		Tfile *f; Mdir *mdir; Mdata *mdat;
1996/0206/sys/src/9/port/devtinyfs.c:341,347 – 1996/0217/sys/src/9/port/devtinyfs.c:348,354
1996/0201		if(mdir == 0)
1996/0131		continue;
1996/0201		if(fs->nfs <= fs->fsize)
1996/0217		if(fs->nfs >= fs->fsize)
1996/0201		expand(fs);
1996/0202
1996/0201		f = &fs->f[fs->nf++];
1996/0206/sys/src/9/port/devtinyfs.c:355,363 – 1996/0217/sys/src/9/port/devtinyfs.c:362,370
1996/0201		} /* follow files */ for(f = fs->f; f; f = f->next){
1996/0217		for(f = fs->f; f < &(fs->f[fs->nf]); f++){
1996/0201		bno = fs->dbno; for(;;) {
1996/0217		for(done = 0; !done;) {
1996/0201		if(isalloced(fs, bno)){ freefile(f, bno); break;
1996/0206/sys/src/9/port/devtinyfs.c:367,373 – 1996/0217/sys/src/9/port/devtinyfs.c:374,380
1996/0201		freefile(fs, f, bno); break; } mdata = validdata(fs, buf);
1996/0217		mdata = validdata(fs, buf, 0);
1996/0201		if(mdata == 0){ freefile(fs, f, bno); break;
1996/0206/sys/src/9/port/devtinyfs.c:380,387 – 1996/0217/sys/src/9/port/devtinyfs.c:387,397
1996/0201		break; case Tagend: f->len += GETS(mdata->bno);
1996/0217		done = 1;
1996/0201		break; }
1996/0217		if(done) f->flag &= ~Fcreating;
1996/0131		} }
1996/0123		}
1996/0206/sys/src/9/port/devtinyfs.c:569,575 – 1996/0217/sys/src/9/port/devtinyfs.c:579,585
1996/0202		f = &fs->f[c->qid.path]; f->r--;
1996/0203		if(f->r == 0){ if(f->creating){
1996/0217		if(f->flag & Fcreating){
1996/0203		/* remove all other files with this name */ for(i = 0; i < fs->fsize; i++){ nf = &fs->f[i];
1996/0206/sys/src/9/port/devtinyfs.c:601,607 – 1996/0217/sys/src/9/port/devtinyfs.c:611,617
1996/0201		} l = &(*l)->next; }
1996/0203		free(fs-f);
1996/0217		free(fs->f);
1996/0201		free(fs->map); close(fs->c);
1996/0203		memset(fs, 0, sizeof(*fs));
1996/0206/sys/src/9/port/devtinyfs.c:618,626 – 1996/0217/sys/src/9/port/devtinyfs.c:628,637
1996/0206		ulong bno, tbno; Mdata *md; uchar buf[Blen];
1996/0217		uchar *p = a;
1996/0203		if(c->qid.path & CHDIR)
1996/0201		return devdirread(c, a, n, tinyfstab, Ntinyfstab, tinyfsgen);
1996/0217		return devdirread(c, a, n, 0, 0, tinyfsgen);
1996/0203		fs = tinyfs.fs[c->dev]; f = &fs->f[c->qid.path];
1996/0206/sys/src/9/port/devtinyfs.c:629,651 – 1996/0217/sys/src/9/port/devtinyfs.c:640,672
1996/0203		if(n + offset >= f->length) n = f->length - offset;
1996/0206		/* walk to first data block */
1996/0217		/* walk to starting data block */
1996/0206		bno = f->dbno; for(sofar = 0; sofar < offset; sofar += Blen){ md = readdata(fs, bno, buf);
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); } /* read first block */ i = offset%Blen;                  /* read data */ for(sofar = 0; sofar+Blen < offset; sofar += Blen){
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; if(i < 0) break; memmove(p, md->data, i); p += i; bno = GETS(md->bno); offset = 0; }
1996/0203
1996/0116		return n;
1996/0217		return sofar;
1996/0116		} Block*
1996/0206/sys/src/9/port/devtinyfs.c:657,676 – 1996/0217/sys/src/9/port/devtinyfs.c:678,721
1996/0116		long tinyfswrite(Chan *c, char *a, long n, ulong offset) { if(waserror()){ qunlock(&tinyfs); nexterror();
1996/0217		Tfs *fs; Tfile *f; int sofar, i; ulong bno, tbno; Mdata *md; uchar buf[Blen]; uchar *p = a; if(c->qid.path & CHDIR) error(Eperm); fs = tinyfs.fs[c->dev]; f = &fs->f[c->qid.path]; /* walk to first data block */ bno = f->dbno; for(sofar = 0; sofar + Blen < offset; sofar += Blen){ md = readdata(fs, bno, buf, 0); if(md == 0) error(Eio); bno = GETS(md->bno);
1996/0116		} qlock(&tinyfs); qunlock(&tinyfs); switch(c->qid.path & ~CHDIR){ case Qdata: break; default: error(Ebadusefd);
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;
1996/0116		} return n;
1996/0217		return sofar;
1996/0116		} long