V7M/src/cmd/restor.c
#define MAXINO 3000
#define BITS 8
#define MAXXTR 60
#define NCACHE 3
#ifndef STANDALONE
#include <stdio.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/ino.h>
#include <sys/fblk.h>
#include <sys/filsys.h>
#include <sys/dir.h>
#include <dumprestor.h>
#else
#include "../h/param.h"
#include "../h/inode.h"
#include "../h/ino.h"
#include "../h/fblk.h"
#include "../h/filsys.h"
#include "../h/dir.h"
#include "../h/dumprestor.h"
#endif
#define MWORD(m,i) (m[(unsigned)(i-1)/MLEN])
#define MBIT(i) (1<<((unsigned)(i-1)%MLEN))
#define BIS(i,w) (MWORD(w,i) |= MBIT(i))
#define BIC(i,w) (MWORD(w,i) &= ~MBIT(i))
#define BIT(i,w) (MWORD(w,i) & MBIT(i))
struct filsys sblock;
int fi;
ino_t ino, maxi, curino;
int mt;
char tapename[] = "/dev/rmt1";
char *magtape = tapename;
#ifdef STANDALONE
char mbuf[50];
#endif
#ifndef STANDALONE
daddr_t seekpt;
int df, ofile;
char dirfile[] = "rstXXXXXX";
struct {
ino_t t_ino;
daddr_t t_seekpt;
} inotab[MAXINO];
int ipos;
#define ONTAPE 1
#define XTRACTD 2
#define XINUSE 4
struct xtrlist {
ino_t x_ino;
char x_flags;
} xtrlist[MAXXTR];
char name[12];
char drblock[BSIZE];
int bpt;
#endif
int eflag;
int volno = 1;
struct dinode tino, dino;
daddr_t taddr[NADDR];
daddr_t curbno;
short dumpmap[MSIZ];
short clrimap[MSIZ];
int bct = NTREC+1;
char tbf[NTREC*BSIZE];
struct cache {
daddr_t c_bno;
int c_time;
char c_block[BSIZE];
} cache[NCACHE];
int curcache;
main(argc, argv)
char *argv[];
{
register char *cp;
char command;
int done();
#ifndef STANDALONE
mktemp(dirfile);
if (argc < 2) {
usage:
printf("Usage: restor x file file..., restor r filesys, or restor t\n");
exit(1);
}
argv++;
argc -= 2;
for (cp = *argv++; *cp; cp++) {
switch (*cp) {
case '-':
break;
case 'f':
magtape = *argv++;
argc--;
break;
case 'r':
case 'R':
case 't':
case 'x':
command = *cp;
break;
default:
printf("Bad key character %c\n", *cp);
goto usage;
}
}
if (command == 'x') {
if (signal(SIGINT, done) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if (signal(SIGTERM, done) == SIG_IGN)
signal(SIGTERM, SIG_IGN);
df = creat(dirfile, 0666);
if (df < 0) {
printf("restor: %s - cannot create directory temporary\n", dirfile);
exit(1);
}
close(df);
df = open(dirfile, 2);
}
doit(command, argc, argv);
if (command == 'x')
unlink(dirfile);
exit(0);
#else
magtape = "tape";
doit('r', 1, 0);
#endif
}
doit(command, argc, argv)
char command;
int argc;
char *argv[];
{
extern char *ctime();
register i, k;
ino_t d;
#ifndef STANDALONE
int xtrfile(), skip();
#endif
int rstrfile(), rstrskip();
struct dinode *ip, *ip1;
#ifndef STANDALONE
if ((mt = open(magtape, 0)) < 0) {
printf("%s: cannot open tape\n", magtape);
exit(1);
}
#else
do {
printf("Tape? ");
gets(mbuf);
mt = open(mbuf, 0);
} while (mt == -1);
magtape = mbuf;
#endif
switch(command) {
#ifndef STANDALONE
case 't':
if (readhdr(&spcl) == 0) {
printf("Tape is not a dump tape\n");
exit(1);
}
printf("Dump date: %s", ctime(&spcl.c_date));
printf("Dumped from: %s", ctime(&spcl.c_ddate));
return;
case 'x':
if (readhdr(&spcl) == 0) {
printf("Tape is not a dump tape\n");
exit(1);
}
if (checkvol(&spcl, 1) == 0) {
printf("Tape is not volume 1 of the dump\n");
exit(1);
}
pass1(); /* This sets the various maps on the way by */
i = 0;
while (i < MAXXTR-1 && argc--) {
if ((d = psearch(*argv)) == 0 || BIT(d, dumpmap) == 0) {
printf("%s: not on the tape\n", *argv++);
continue;
}
xtrlist[i].x_ino = d;
xtrlist[i].x_flags |= XINUSE;
printf("%s: inode %u\n", *argv, d);
argv++;
i++;
}
newvol:
flsht();
close(mt);
getvol:
printf("Mount desired tape volume: Specify volume #: ");
if (gets(tbf) == NULL)
return;
volno = atoi(tbf);
if (volno <= 0) {
printf("Volume numbers are positive numerics\n");
goto getvol;
}
mt = open(magtape, 0);
if (readhdr(&spcl) == 0) {
printf("tape is not dump tape\n");
goto newvol;
}
if (checkvol(&spcl, volno) == 0) {
printf("Wrong volume (%d)\n", spcl.c_volume);
goto newvol;
}
rbits:
while (gethead(&spcl) == 0)
;
if (checktype(&spcl, TS_INODE) == 1) {
printf("Can't find inode mask!\n");
goto newvol;
}
if (checktype(&spcl, TS_BITS) == 0)
goto rbits;
readbits(dumpmap);
i = 0;
for (k = 0; xtrlist[k].x_flags; k++) {
if (BIT(xtrlist[k].x_ino, dumpmap)) {
xtrlist[k].x_flags |= ONTAPE;
i++;
}
}
while (i > 0) {
again:
if (ishead(&spcl) == 0)
while(gethead(&spcl) == 0)
;
if (checktype(&spcl, TS_END) == 1) {
printf("end of tape\n");
checkdone:
for (k = 0; xtrlist[k].x_flags; k++)
if ((xtrlist[k].x_flags&XTRACTD) == 0)
goto newvol;
return;
}
if (checktype(&spcl, TS_INODE) == 0) {
gethead(&spcl);
goto again;
}
d = spcl.c_inumber;
for (k = 0; xtrlist[k].x_flags; k++) {
if (d == xtrlist[k].x_ino) {
printf("extract file %u\n", xtrlist[k].x_ino);
sprintf(name, "%u", xtrlist[k].x_ino);
if ((ofile = creat(name, 0666)) < 0) {
printf("%s: cannot create file\n", name);
i--;
continue;
}
chown(name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid);
getfile(ino, xtrfile, skip, spcl.c_dinode.di_size);
i--;
xtrlist[k].x_flags |= XTRACTD;
close(ofile);
goto done;
}
}
gethead(&spcl);
done:
;
}
goto checkdone;
#endif
case 'r':
case 'R':
#ifndef STANDALONE
if ((fi = open(*argv, 2)) < 0) {
printf("%s: cannot open\n", *argv);
exit(1);
}
#else
do {
char charbuf[50];
printf("Disk? ");
gets(charbuf);
fi = open(charbuf, 2);
} while (fi == -1);
#endif
#ifndef STANDALONE
if (command == 'R') {
printf("Enter starting volume number: ");
if (gets(tbf) == EOF) {
volno = 1;
printf("\n");
}
else
volno = atoi(tbf);
}
else
#endif
volno = 1;
printf("Last chance before scribbling on %s. ",
#ifdef STANDALONE
"disk");
#else
*argv);
#endif
while (getchar() != '\n');
dread((daddr_t)1, (char *)&sblock, sizeof(sblock));
maxi = (sblock.s_isize-2)*INOPB;
if (readhdr(&spcl) == 0) {
printf("Missing volume record\n");
exit(1);
}
if (checkvol(&spcl, volno) == 0) {
printf("Tape is not volume %d\n", volno);
exit(1);
}
gethead(&spcl);
for (;;) {
ragain:
if (ishead(&spcl) == 0) {
printf("Missing header block\n");
while (gethead(&spcl) == 0)
;
eflag++;
}
if (checktype(&spcl, TS_END) == 1) {
printf("End of tape\n");
close(mt);
dwrite( (daddr_t) 1, (char *) &sblock);
return;
}
if (checktype(&spcl, TS_CLRI) == 1) {
readbits(clrimap);
for (ino = 1; ino <= maxi; ino++)
if (BIT(ino, clrimap) == 0) {
getdino(ino, &tino);
if (tino.di_mode == 0)
continue;
itrunc(&tino);
clri(&tino);
putdino(ino, &tino);
}
dwrite( (daddr_t) 1, (char *) &sblock);
goto ragain;
}
if (checktype(&spcl, TS_BITS) == 1) {
readbits(dumpmap);
goto ragain;
}
if (checktype(&spcl, TS_INODE) == 0) {
printf("Unknown header type\n");
eflag++;
gethead(&spcl);
goto ragain;
}
ino = spcl.c_inumber;
if (eflag)
printf("Resynced at inode %u\n", ino);
eflag = 0;
if (ino > maxi) {
printf("%u: ilist too small\n", ino);
gethead(&spcl);
goto ragain;
}
dino = spcl.c_dinode;
getdino(ino, &tino);
curbno = 0;
itrunc(&tino);
clri(&tino);
for (i = 0; i < NADDR; i++)
taddr[i] = 0;
l3tol(taddr, dino.di_addr, 1);
getfile(ino, rstrfile, rstrskip, dino.di_size);
ip = &tino;
ltol3(ip->di_addr, taddr, NADDR);
ip1 = &dino;
ip->di_mode = ip1->di_mode;
ip->di_nlink = ip1->di_nlink;
ip->di_uid = ip1->di_uid;
ip->di_gid = ip1->di_gid;
ip->di_size = ip1->di_size;
ip->di_atime = ip1->di_atime;
ip->di_mtime = ip1->di_mtime;
ip->di_ctime = ip1->di_ctime;
putdino(ino, &tino);
}
}
}
/*
* Read the tape, bulding up a directory structure for extraction
* by name
*/
#ifndef STANDALONE
pass1()
{
register i;
struct dinode *ip;
int putdir(), null();
while (gethead(&spcl) == 0) {
printf("Can't find directory header!\n");
}
for (;;) {
if (checktype(&spcl, TS_BITS) == 1) {
readbits(dumpmap);
continue;
}
if (checktype(&spcl, TS_CLRI) == 1) {
readbits(clrimap);
continue;
}
if (checktype(&spcl, TS_INODE) == 0) {
finish:
flsh();
close(mt);
return;
}
ip = &spcl.c_dinode;
i = ip->di_mode & IFMT;
if (i != IFDIR) {
goto finish;
}
inotab[ipos].t_ino = spcl.c_inumber;
inotab[ipos++].t_seekpt = seekpt;
getfile(spcl.c_inumber, putdir, null, spcl.c_dinode.di_size);
putent("\000\000/");
}
}
#endif
/*
* Do the file extraction, calling the supplied functions
* with the blocks
*/
getfile(n, f1, f2, size)
ino_t n;
int (*f2)(), (*f1)();
long size;
{
register i;
struct spcl addrblock;
char buf[BSIZE];
addrblock = spcl;
curino = n;
goto start;
for (;;) {
if (gethead(&addrblock) == 0) {
printf("Missing address (header) block\n");
goto eloop;
}
if (checktype(&addrblock, TS_ADDR) == 0) {
spcl = addrblock;
curino = 0;
return;
}
start:
for (i = 0; i < addrblock.c_count; i++) {
if (addrblock.c_addr[i]) {
readtape(buf);
(*f1)(buf, size > BSIZE ? (long) BSIZE : size);
}
else {
clearbuf(buf);
(*f2)(buf, size > BSIZE ? (long) BSIZE : size);
}
if ((size -= BSIZE) <= 0) {
eloop:
while (gethead(&spcl) == 0)
;
if (checktype(&spcl, TS_ADDR) == 1)
goto eloop;
curino = 0;
return;
}
}
}
}
/*
* Do the tape i\/o, dealling with volume changes
* etc..
*/
readtape(b)
char *b;
{
register i;
struct spcl tmpbuf;
if (bct >= NTREC) {
for (i = 0; i < NTREC; i++)
((struct spcl *)&tbf[i*BSIZE])->c_magic = 0;
bct = 0;
if ((i = read(mt, tbf, NTREC*BSIZE)) < 0) {
printf("Tape read error: inode %u\n", curino);
eflag++;
for (i = 0; i < NTREC; i++)
clearbuf(&tbf[i*BSIZE]);
}
if (i == 0) {
bct = NTREC + 1;
volno++;
loop:
flsht();
close(mt);
printf("Mount volume %d\n", volno);
while (getchar() != '\n')
;
if ((mt = open(magtape, 0)) == -1) {
printf("Cannot open tape!\n");
goto loop;
}
if (readhdr(&tmpbuf) == 0) {
printf("Not a dump tape.Try again\n");
goto loop;
}
if (checkvol(&tmpbuf, volno) == 0) {
printf("Wrong tape. Try again\n");
goto loop;
}
readtape(b);
return;
}
}
copy(&tbf[(bct++*BSIZE)], b, BSIZE);
}
flsht()
{
bct = NTREC+1;
}
copy(f, t, s)
register char *f, *t;
{
register i;
i = s;
do
*t++ = *f++;
while (--i);
}
clearbuf(cp)
register char *cp;
{
register i;
i = BSIZE;
do
*cp++ = 0;
while (--i);
}
/*
* Put and get the directory entries from the compressed
* directory file
*/
#ifndef STANDALONE
putent(cp)
char *cp;
{
register i;
for (i = 0; i < sizeof(ino_t); i++)
writec(*cp++);
for (i = 0; i < DIRSIZ; i++) {
writec(*cp);
if (*cp++ == 0)
return;
}
return;
}
getent(bf)
register char *bf;
{
register i;
for (i = 0; i < sizeof(ino_t); i++)
*bf++ = readc();
for (i = 0; i < DIRSIZ; i++)
if ((*bf++ = readc()) == 0)
return;
return;
}
/*
* read/write te directory file
*/
writec(c)
char c;
{
drblock[bpt++] = c;
seekpt++;
if (bpt >= BSIZE) {
bpt = 0;
write(df, drblock, BSIZE);
}
}
readc()
{
if (bpt >= BSIZE) {
read(df, drblock, BSIZE);
bpt = 0;
}
return(drblock[bpt++]);
}
mseek(pt)
daddr_t pt;
{
bpt = BSIZE;
lseek(df, pt, 0);
}
flsh()
{
write(df, drblock, bpt+1);
}
/*
* search the directory inode ino
* looking for entry cp
*/
ino_t
search(inum, cp)
ino_t inum;
char *cp;
{
register i;
struct direct dir;
for (i = 0; i < MAXINO; i++)
if (inotab[i].t_ino == inum) {
goto found;
}
return(0);
found:
mseek(inotab[i].t_seekpt);
do {
getent((char *)&dir);
if (direq(dir.d_name, "/"))
return(0);
} while (direq(dir.d_name, cp) == 0);
return(dir.d_ino);
}
/*
* Search the directory tree rooted at inode 2
* for the path pointed at by n
*/
psearch(n)
char *n;
{
register char *cp, *cp1;
char c;
ino = 2;
if (*(cp = n) == '/')
cp++;
next:
cp1 = cp + 1;
while (*cp1 != '/' && *cp1)
cp1++;
c = *cp1;
*cp1 = 0;
ino = search(ino, cp);
if (ino == 0) {
*cp1 = c;
return(0);
}
*cp1 = c;
if (c == '/') {
cp = cp1+1;
goto next;
}
return(ino);
}
direq(s1, s2)
register char *s1, *s2;
{
register i;
for (i = 0; i < DIRSIZ; i++)
if (*s1++ == *s2) {
if (*s2++ == 0)
return(1);
} else
return(0);
return(1);
}
#endif
/*
* read/write a disk block, be sure to update the buffer
* cache if needed.
*/
dwrite(bno, b)
daddr_t bno;
char *b;
{
register i;
for (i = 0; i < NCACHE; i++) {
if (cache[i].c_bno == bno) {
copy(b, cache[i].c_block, BSIZE);
cache[i].c_time = 0;
break;
}
else
cache[i].c_time++;
}
lseek(fi, bno*BSIZE, 0);
if(write(fi, b, BSIZE) != BSIZE) {
#ifdef STANDALONE
printf("disk write error %D\n", bno);
#else
fprintf(stderr, "disk write error %ld\n", bno);
#endif
exit(1);
}
}
dread(bno, buf, cnt)
daddr_t bno;
char *buf;
{
register i, j;
j = 0;
for (i = 0; i < NCACHE; i++) {
if (++curcache >= NCACHE)
curcache = 0;
if (cache[curcache].c_bno == bno) {
copy(cache[curcache].c_block, buf, cnt);
cache[curcache].c_time = 0;
return;
}
else {
cache[curcache].c_time++;
if (cache[j].c_time < cache[curcache].c_time)
j = curcache;
}
}
lseek(fi, bno*BSIZE, 0);
if (read(fi, cache[j].c_block, BSIZE) != BSIZE) {
#ifdef STANDALONE
printf("read error %D\n", bno);
#else
printf("read error %ld\n", bno);
#endif
exit(1);
}
copy(cache[j].c_block, buf, cnt);
cache[j].c_time = 0;
cache[j].c_bno = bno;
}
/*
* the inode manpulation routines. Like the system.
*
* clri zeros the inode
*/
clri(ip)
struct dinode *ip;
{
int i, *p;
i = sizeof(struct dinode)/sizeof(int);
p = (int *)ip;
do
*p++ = 0;
while(--i);
}
/*
* itrunc/tloop/bfree free all of the blocks pointed at by the inode
*/
itrunc(ip)
register struct dinode *ip;
{
register i;
daddr_t bn, iaddr[NADDR];
if (ip->di_mode == 0)
return;
i = ip->di_mode & IFMT;
if (i != IFDIR && i != IFREG)
return;
l3tol(iaddr, ip->di_addr, NADDR);
for(i=NADDR-1;i>=0;i--) {
bn = iaddr[i];
if(bn == 0) continue;
switch(i) {
default:
bfree(bn);
break;
case NADDR-3:
tloop(bn, 0, 0);
break;
case NADDR-2:
tloop(bn, 1, 0);
break;
case NADDR-1:
tloop(bn, 1, 1);
}
}
ip->di_size = 0;
}
tloop(bn, f1, f2)
daddr_t bn;
int f1, f2;
{
register i;
daddr_t nb;
union {
char data[BSIZE];
daddr_t indir[NINDIR];
} ibuf;
dread(bn, ibuf.data, BSIZE);
for(i=NINDIR-1;i>=0;i--) {
nb = ibuf.indir[i];
if(nb) {
if(f1)
tloop(nb, f2, 0);
else
bfree(nb);
}
}
bfree(bn);
}
bfree(bn)
daddr_t bn;
{
register i;
union {
char data[BSIZE];
struct fblk frees;
} fbuf;
if(sblock.s_nfree >= NICFREE) {
fbuf.df_nfree = sblock.s_nfree;
for(i=0;i<NICFREE;i++)
fbuf.df_free[i] = sblock.s_free[i];
sblock.s_nfree = 0;
dwrite(bn, fbuf.data);
}
sblock.s_free[sblock.s_nfree++] = bn;
}
/*
* allocate a block off the free list.
*/
daddr_t
balloc()
{
daddr_t bno;
register i;
static char zeroes[BSIZE];
union {
char data[BSIZE];
struct fblk frees;
} fbuf;
if(sblock.s_nfree == 0 || (bno=sblock.s_free[--sblock.s_nfree]) == 0) {
#ifdef STANDALONE
printf("Out of space\n");
#else
fprintf(stderr, "Out of space.\n");
#endif
exit(1);
}
if(sblock.s_nfree == 0) {
dread(bno, fbuf.data, BSIZE);
sblock.s_nfree = fbuf.df_nfree;
for(i=0;i<NICFREE;i++)
sblock.s_free[i] = fbuf.df_free[i];
}
dwrite(bno, zeroes);
return(bno);
}
/*
* map a block number into a block address, ensuring
* all of the correct indirect blocks are around. Allocate
* the block requested.
*/
daddr_t
bmap(iaddr, bn)
daddr_t iaddr[NADDR];
daddr_t bn;
{
register i;
int j, sh;
daddr_t nb, nnb;
daddr_t indir[NINDIR];
/*
* blocks 0..NADDR-4 are direct blocks
*/
if(bn < NADDR-3) {
iaddr[bn] = nb = balloc();
return(nb);
}
/*
* addresses NADDR-3, NADDR-2, and NADDR-1
* have single, double, triple indirect blocks.
* the first step is to determine
* how many levels of indirection.
*/
sh = 0;
nb = 1;
bn -= NADDR-3;
for(j=3; j>0; j--) {
sh += NSHIFT;
nb <<= NSHIFT;
if(bn < nb)
break;
bn -= nb;
}
if(j == 0) {
return((daddr_t)0);
}
/*
* fetch the address from the inode
*/
if((nb = iaddr[NADDR-j]) == 0) {
iaddr[NADDR-j] = nb = balloc();
}
/*
* fetch through the indirect blocks
*/
for(; j<=3; j++) {
dread(nb, (char *)indir, BSIZE);
sh -= NSHIFT;
i = (bn>>sh) & NMASK;
nnb = indir[i];
if(nnb == 0) {
nnb = balloc();
indir[i] = nnb;
dwrite(nb, (char *)indir);
}
nb = nnb;
}
return(nb);
}
/*
* read the tape into buf, then return whether or
* or not it is a header block.
*/
gethead(buf)
struct spcl *buf;
{
readtape((char *)buf);
if (buf->c_magic != MAGIC || checksum((int *) buf) == 0)
return(0);
return(1);
}
/*
* return whether or not the buffer contains a header block
*/
ishead(buf)
struct spcl *buf;
{
if (buf->c_magic != MAGIC || checksum((int *) buf) == 0)
return(0);
return(1);
}
checktype(b, t)
struct spcl *b;
int t;
{
return(b->c_type == t);
}
checksum(b)
int *b;
{
register i, j;
j = BSIZE/sizeof(int);
i = 0;
do
i += *b++;
while (--j);
if (i != CHECKSUM) {
printf("Checksum error %o\n", i);
return(0);
}
return(1);
}
checkvol(b, t)
struct spcl *b;
int t;
{
if (b->c_volume == t)
return(1);
return(0);
}
readhdr(b)
struct spcl *b;
{
if (gethead(b) == 0)
return(0);
if (checktype(b, TS_TAPE) == 0)
return(0);
return(1);
}
/*
* The next routines are called during file extraction to
* put the data into the right form and place.
*/
#ifndef STANDALONE
xtrfile(b, size)
char *b;
long size;
{
write(ofile, b, (int) size);
}
null() {;}
skip()
{
lseek(ofile, (long) BSIZE, 1);
}
#endif
rstrfile(b, s)
char *b;
long s;
{
daddr_t d;
d = bmap(taddr, curbno);
dwrite(d, b);
curbno += 1;
}
rstrskip(b, s)
char *b;
long s;
{
curbno += 1;
}
#ifndef STANDALONE
putdir(b)
char *b;
{
register struct direct *dp;
register i;
for (dp = (struct direct *) b, i = 0; i < BSIZE; dp++, i += sizeof(*dp)) {
if (dp->d_ino == 0)
continue;
putent((char *) dp);
}
}
#endif
/*
* read/write an inode from the disk
*/
getdino(inum, b)
ino_t inum;
struct dinode *b;
{
daddr_t bno;
char buf[BSIZE];
bno = (ino - 1)/INOPB;
bno += 2;
dread(bno, buf, BSIZE);
copy(&buf[((inum-1)%INOPB)*sizeof(struct dinode)], (char *) b, sizeof(struct dinode));
}
putdino(inum, b)
ino_t inum;
struct dinode *b;
{
daddr_t bno;
char buf[BSIZE];
bno = ((ino - 1)/INOPB) + 2;
dread(bno, buf, BSIZE);
copy((char *) b, &buf[((inum-1)%INOPB)*sizeof(struct dinode)], sizeof(struct dinode));
dwrite(bno, buf);
}
/*
* read a bit mask from the tape into m.
*/
readbits(m)
short *m;
{
register i;
i = spcl.c_count;
while (i--) {
readtape((char *) m);
m += (BSIZE/(MLEN/BITS));
}
while (gethead(&spcl) == 0)
;
}
done()
{
#ifndef STANDALONE
unlink(dirfile);
#endif
exit(0);
}