void minix_truncate(register struct inode *inode)
{
int retry;
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
S_ISLNK(inode->i_mode))) return;
while (1) {
retry = V1_trunc_direct(inode);
retry |= V1_trunc_indirect(inode, 7, &inode->i_zone[7]);
retry |= V1_trunc_dindirect(inode, 7 + 512, &inode->i_zone[8]);
if (!retry) break;
schedule();
}
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_dirt = 1;
}
static int V1_trunc_dindirect(register struct inode *inode,
int offset, unsigned short *p)
{
int i;
unsigned short tmp;
register struct buffer_head *dind_bh;
unsigned short *dind;
int retry = 0;
if (!(tmp = *p))
return 0;
dind_bh = bread(inode->i_dev, (block_t) tmp);
if (tmp != *p) {
brelse(dind_bh);
return 1;
}
if (!dind_bh) {
*p = 0;
return 0;
}
map_buffer(dind_bh);
repeat:
for (i = DINDIRECT_BLOCK(offset); i < 512; i++) {
if (i < 0)
i = 0;
if (i < DINDIRECT_BLOCK(offset))
goto repeat;
dind = i + (unsigned short *) dind_bh->b_data;
retry |= V1_trunc_indirect(inode, offset + (i << 9), dind);
mark_buffer_dirty(dind_bh, 1);
}
dind = (unsigned short *) dind_bh->b_data;
for (i = 0; i < 512; i++)
if (*(dind++))
break;
if (i >= 512)
if (dind_bh->b_count != 1)
retry = 1;
else {
tmp = *p;
*p = 0;
inode->i_dirt = 1;
minix_free_block(inode->i_sb, tmp);
}
unmap_brelse(dind_bh);
return retry;
}
