/*
exactly the same as getblock(), but the data will be completely
overwritten. so there is no need to read from disk first
*/
struct buffer FAR * getblockOver(ULONG blkno, COUNT dsk)
{
struct buffer FAR *bp;
/* Search through buffers to see if the required block */
/* is already in a buffer */
if (searchblock(blkno, dsk, &bp))
{
return bp;
}
/* The block we need is not in a buffer, we must make a buffer */
/* available. */
/* take the buffer than lbp points to and flush it, then make it available. */
if (flush1(bp)) /* success */
{
bp->b_flag = 0;
bp->b_unit = dsk;
setblkno(bp, blkno);
return bp;
}
else
/* failure */
{
return NULL;
}
}
struct buffer FAR *getblock(ULONG blkno, COUNT dsk)
{
struct buffer FAR *bp;
/* Search through buffers to see if the required block */
/* is already in a buffer */
if (searchblock(blkno, dsk, &bp))
{
return (bp);
}
/* The block we need is not in a buffer, we must make a buffer */
/* available, and fill it with the desired block */
/* take the buffer that lbp points to and flush it, then read new block. */
if (!flush1(bp))
return NULL;
/* Fill the indicated disk buffer with the current track and sector */
if (dskxfer(dsk, blkno, (VOID FAR *) bp->b_buffer, 1, DSKREAD))
{
return NULL;
}
bp->b_flag = BFR_VALID | BFR_DATA;
bp->b_unit = dsk;
setblkno(bp, blkno);
return bp;
}
void pass3(void)
{
uint16_t n;
struct dinode ino;
uint16_t mode;
blkno_t b;
blkno_t bno;
blkno_t newno;
blkno_t blk_alloc0();
/*--- was blk_alloc ---*/
blkno_t getblkno();
int yes();
for (b = swizzle16(superblock.s_isize); b < swizzle16(superblock.s_fsize); ++b)
bitmap[b] = 0;
for (n = ROOTINODE; n < 8 * (swizzle16(superblock.s_isize) - 2); ++n) {
iread(n, &ino);
mode = swizzle16(ino.i_mode) & F_MASK;
if (mode != F_REG && mode != F_DIR)
continue;
/* Check singly indirect blocks */
for (b = 18; b < 20; ++b) {
if (ino.i_addr[b] != 0) {
if (bitmap[swizzle16(ino.i_addr[b])] != 0) {
printf("Indirect block %d in inode %u value %u multiply allocated. Fix? ",
b, n, swizzle16(ino.i_addr[b]));
if (yes()) {
newno = blk_alloc0(&superblock);
if (newno == 0)
printf("Sorry... No more free blocks.\n");
else {
dwrite(newno, daread(swizzle16(ino.i_addr[b])));
ino.i_addr[b] = swizzle16(newno);
iwrite(n, &ino);
}
}
} else
bitmap[swizzle16(ino.i_addr[b])] = 1;
}
}
/* Check the rest */
for (bno = 0; bno <= swizzle32(ino.i_size)/512; ++bno) {
b = getblkno(&ino, bno);
if (b != 0) {
if (bitmap[b] != 0) {
printf("Block %d in inode %u value %u multiply allocated. Fix? ",
bno, n, b);
if (yes()) {
newno = blk_alloc0(&superblock);
if (newno == 0)
printf("Sorry... No more free blocks.\n");
else {
dwrite(newno, daread(b));
setblkno(&ino, bno, newno);
iwrite(n, &ino);
}
}
} else
bitmap[b] = 1;
}
}
}
}
void pass1(void)
{
uint16_t n;
struct dinode ino;
uint16_t mode;
blkno_t b;
blkno_t bno;
uint16_t icount;
blkno_t *buf;
blkno_t getblkno();
int yes(); /* 1.4.98 - HFB */
icount = 0;
for (n = ROOTINODE; n < 8 * (swizzle16(superblock.s_isize) - 2); ++n) {
iread(n, &ino);
linkmap[n] = -1;
if (ino.i_mode == 0)
continue;
mode = swizzle16(ino.i_mode) & F_MASK;
/* FIXME: named pipes.. */
/* Check mode */
if (mode != F_REG && mode != F_DIR && mode != F_BDEV && mode != F_CDEV) {
printf("Inode %d with mode 0%o is not of correct type. Zap? ",
n, swizzle16(ino.i_mode));
if (yes()) {
ino.i_mode = 0;
ino.i_nlink = 0;
iwrite(n, &ino);
continue;
}
}
linkmap[n] = 0;
++icount;
/* Check size */
if (swizzle32(ino.i_size) < 0) {
printf("Inode %d offset is negative with value of %ld. Fix? ",
n, (long)swizzle32(ino.i_size));
if (yes()) {
ino.i_size = 0;
iwrite(n, &ino);
}
}
/* Check blocks and build free block map */
if (mode == F_REG || mode == F_DIR) {
/* Check singly indirect blocks */
for (b = 18; b < 20; ++b) {
if (ino.i_addr[b] != 0 &&
(swizzle16(ino.i_addr[b]) < swizzle16(superblock.s_isize) ||
swizzle16(ino.i_addr[b]) >= swizzle16(superblock.s_fsize))) {
printf("Inode %d singly ind. blk %d out of range, val = %u. Zap? ",
n, b, swizzle16(ino.i_addr[b]));
if (yes()) {
ino.i_addr[b] = 0;
iwrite(n, &ino);
}
}
if (ino.i_addr[b] != 0 && swizzle32(ino.i_size) < 18*512) {
printf("Inode %d singly ind. blk %d past end of file, val = %u. Zap? ",
n, b, swizzle16(ino.i_addr[b]));
if (yes()) {
ino.i_addr[b] = 0;
iwrite(n, &ino);
}
}
if (ino.i_addr[b] != 0)
bitmap[swizzle16(ino.i_addr[b])] = 1;
}
/* Check the double indirect blocks */
if (ino.i_addr[19] != 0) {
buf = (blkno_t *) daread(swizzle16(ino.i_addr[19]));
for (b = 0; b < 256; ++b) {
if (buf[b] != 0 && (swizzle16(buf[b]) < swizzle16(superblock.s_isize) ||
swizzle16(buf[b]) >= swizzle16(superblock.s_fsize))) {
printf("Inode %d doubly ind. blk %d is ", n, b);
printf("out of range, val = %u. Zap? ", swizzle16(buf[b]));
/* 1.4.98 - line split. HFB */
if (yes()) {
buf[b] = 0;
dwrite(b, (char *) buf);
}
}
if (buf[b] != 0)
bitmap[swizzle16(buf[b])] = 1;
}
}
/* Check the rest */
for (bno = 0; bno <= swizzle32(ino.i_size)/512; ++bno) {
b = getblkno(&ino, bno);
if (b != 0 && (b < swizzle16(superblock.s_isize) || b >= swizzle16(superblock.s_fsize))) {
printf("Inode %d block %d out of range, val = %u. Zap? ",
n, bno, b);
if (yes()) {
setblkno(&ino, bno, 0);
iwrite(n, &ino);
}
}
if (b != 0)
bitmap[b] = 1;
}
}
}
/* Fix free inode count in superblock block */
if (swizzle16(superblock.s_tinode) != 8 * (swizzle16(superblock.s_isize) - 2) - ROOTINODE - icount) {
printf("Free inode count in superblock block is %u, should be %u. Fix? ",
swizzle16(superblock.s_tinode), 8 * (swizzle16(superblock.s_isize) - 2) - ROOTINODE - icount);
if (yes()) {
superblock.s_tinode = 8 * (swizzle16(superblock.s_isize) - 2) - ROOTINODE - icount;
dwrite((blkno_t) 1, (char *) &superblock);
}
}
}
