static void free_branches(struct inode *inode, block_t *p, block_t *q, int depth)
{
struct buffer_head * bh;
unsigned long nr;
if (depth--) {
for ( ; p < q ; p++) {
nr = block_to_cpu(*p);
if (!nr)
continue;
*p = 0;
bh = sb_bread(inode->i_sb, nr);
if (!bh)
continue;
free_branches(inode, (block_t*)bh->b_data,
block_end(bh), depth);
bforget(bh);
minix_free_block(inode, nr);
mark_inode_dirty(inode);
}
} else
free_data(inode, p, q);
}
static inline int splice_branch(struct inode *inode,
Indirect chain[DEPTH],
Indirect *where,
int num)
{
int i;
write_lock(&pointers_lock);
/* */
if (!verify_chain(chain, where-1) || *where->p)
goto changed;
*where->p = where->key;
write_unlock(&pointers_lock);
/* */
inode->i_ctime = CURRENT_TIME_SEC;
/* */
if (where->bh)
mark_buffer_dirty_inode(where->bh, inode);
mark_inode_dirty(inode);
return 0;
changed:
write_unlock(&pointers_lock);
for (i = 1; i < num; i++)
bforget(where[i].bh);
for (i = 0; i < num; i++)
minix_free_block(inode, block_to_cpu(where[i].key));
return -EAGAIN;
}
static inline int splice_branch(struct inode *inode,
Indirect chain[DEPTH],
Indirect *where,
int num)
{
int i;
write_lock(&pointers_lock);
/* Verify that place we are splicing to is still there and vacant */
if (!verify_chain(chain, where-1) || *where->p)
goto changed;
*where->p = where->key;
write_unlock(&pointers_lock);
/* We are done with atomic stuff, now do the rest of housekeeping */
inode->i_ctime = CURRENT_TIME_SEC;
/* had we spliced it onto indirect block? */
if (where->bh)
mark_buffer_dirty_inode(where->bh, inode);
mark_inode_dirty(inode);
return 0;
changed:
write_unlock(&pointers_lock);
for (i = 1; i < num; i++)
bforget(where[i].bh);
for (i = 0; i < num; i++)
minix_free_block(inode, block_to_cpu(where[i].key));
return -EAGAIN;
}
static int V1_trunc_indirect(register struct inode *inode,
int offset, unsigned short *p)
{
struct buffer_head *bh;
int i;
unsigned short tmp;
register struct buffer_head *ind_bh;
unsigned short *ind;
int retry = 0;
tmp = *p;
if (!tmp)
return 0;
ind_bh = bread(inode->i_dev, (block_t) tmp);
if (tmp != *p) {
brelse(ind_bh);
return 1;
}
if (!ind_bh) {
*p = 0;
return 0;
}
map_buffer(ind_bh);
repeat:
for (i = INDIRECT_BLOCK(offset); i < 512; i++) {
if (i < 0) {
i = 0;
} else if (i < INDIRECT_BLOCK(offset)) {
goto repeat;
}
ind = i + (unsigned short *) ind_bh->b_data;
tmp = *ind;
if (!tmp)
continue;
bh = get_hash_table(inode->i_dev, (block_t) tmp);
if (i < INDIRECT_BLOCK(offset)) {
brelse(bh);
goto repeat;
}
if ((bh && bh->b_count != 1) || tmp != *ind) {
retry = 1;
brelse(bh);
continue;
}
*ind = 0;
mark_buffer_dirty(ind_bh, 1);
brelse(bh);
minix_free_block(inode->i_sb, tmp);
}
ind = (unsigned short *) ind_bh->b_data;
for (i = 0; i < 512; i++)
if (*(ind++))
break;
if (i >= 512)
if (ind_bh->b_count != 1)
retry = 1;
else {
tmp = *p;
*p = 0;
minix_free_block(inode->i_sb, tmp);
}
unmap_brelse(ind_bh);
return retry;
}
