/*
* Free a double indirect block.
*/
int fs_double_indirect_block_free (fs_t *fs, unsigned int bno)
{
unsigned nb;
unsigned char data [BSDFS_BSIZE];
int i;
if (! fs_read_block (fs, bno, data)) {
fprintf (stderr, "inode_clear: read error at block %d\n", bno);
return 0;
}
for (i=BSDFS_BSIZE-2; i>=0; i-=2) {
nb = data [i+1] << 8 | data [i];
if (nb)
fs_indirect_block_free (fs, nb);
}
fs_block_free (fs, bno);
return 1;
}
/*
* Free a double indirect block.
*/
int fs_double_indirect_block_free (fs_t *fs, unsigned int bno, int nblk)
{
unsigned nb;
unsigned char data [BSDFS_BSIZE];
int i;
if (! fs_read_block (fs, bno, data)) {
fprintf (stderr, "inode_clear: read error at block %d\n", bno);
return 0;
}
for (i=BSDFS_BSIZE-4; i>=0; i-=4) {
if (i/4 * BSDFS_BSIZE/4 < nblk) {
/* Truncate up to required size. */
return 0;
}
nb = data [i+3] << 24 | data [i+2] << 16 |
data [i+1] << 8 | data [i];
if (nb)
fs_indirect_block_free (fs, nb,
nblk - i/4 * BSDFS_BSIZE/4);
}
fs_block_free (fs, bno);
return 1;
}