/*
* Lookup/Create a block at offset 'block' into 'inode'. We currently do
* not support creation of new blocks, so we return -EIO for this case.
*/
int
adfs_get_block(struct inode *inode, long block, struct buffer_head *bh, int create)
{
if (block < 0)
goto abort_negative;
if (!create) {
if (block >= inode->i_blocks)
goto abort_toobig;
block = __adfs_block_map(inode->i_sb, inode->i_ino, block);
if (block) {
bh->b_dev = inode->i_dev;
bh->b_blocknr = block;
bh->b_state |= (1UL << BH_Mapped);
}
return 0;
}
/* don't support allocation of blocks yet */
return -EIO;
abort_negative:
adfs_error(inode->i_sb, "block %d < 0", block);
return -EIO;
abort_toobig:
return 0;
}
static int
adfs_dir_lookup_byname(struct inode *inode, struct qstr *name, struct object_info *obj)
{
struct super_block *sb = inode->i_sb;
struct adfs_dir_ops *ops = sb->u.adfs_sb.s_dir;
struct adfs_dir dir;
int ret;
ret = ops->read(sb, inode->i_ino, inode->i_size, &dir);
if (ret)
goto out;
if (inode->u.adfs_i.parent_id != dir.parent_id) {
adfs_error(sb, "parent directory changed under me! (%lx but got %lx)\n",
inode->u.adfs_i.parent_id, dir.parent_id);
ret = -EIO;
goto free_out;
}
obj->parent_id = inode->i_ino;
/*
* '.' is handled by reserved_lookup() in fs/namei.c
*/
if (name->len == 2 && name->name[0] == '.' && name->name[1] == '.') {
/*
* Currently unable to fill in the rest of 'obj',
* but this is better than nothing. We need to
* ascend one level to find it's parent.
*/
obj->name_len = 0;
obj->file_id = obj->parent_id;
goto free_out;
}
read_lock(&adfs_dir_lock);
ret = ops->setpos(&dir, 0);
if (ret)
goto unlock_out;
ret = -ENOENT;
while (ops->getnext(&dir, obj) == 0) {
if (adfs_match(name, obj)) {
ret = 0;
break;
}
}
unlock_out:
read_unlock(&adfs_dir_lock);
free_out:
ops->free(&dir);
out:
return ret;
}
static int
adfs_fplus_read(struct super_block *sb, unsigned int id, unsigned int sz, struct adfs_dir *dir)
{
struct adfs_bigdirheader *h;
struct adfs_bigdirtail *t;
unsigned long block;
unsigned int blk, size;
int i, ret = -EIO;
dir->nr_buffers = 0;
block = __adfs_block_map(sb, id, 0);
if (!block) {
adfs_error(sb, "dir object %X has a hole at offset 0", id);
goto out;
}
dir->bh[0] = bread(sb->s_dev, block, sb->s_blocksize);
if (!dir->bh[0])
goto out;
dir->nr_buffers += 1;
h = (struct adfs_bigdirheader *)dir->bh[0]->b_data;
size = le32_to_cpu(h->bigdirsize);
if (size != sz) {
printk(KERN_WARNING "adfs: adfs_fplus_read: directory header size\n"
" does not match directory size\n");
}
if (h->bigdirversion[0] != 0 || h->bigdirversion[1] != 0 ||
h->bigdirversion[2] != 0 || size & 2047 ||
h->bigdirstartname != cpu_to_le32(BIGDIRSTARTNAME))
goto out;
size >>= sb->s_blocksize_bits;
for (blk = 1; blk < size; blk++) {
block = __adfs_block_map(sb, id, blk);
if (!block) {
adfs_error(sb, "dir object %X has a hole at offset %d", id, blk);
goto out;
}
dir->bh[blk] = bread(sb->s_dev, block, sb->s_blocksize);
if (!dir->bh[blk])
goto out;
dir->nr_buffers = blk;
}
t = (struct adfs_bigdirtail *)(dir->bh[size - 1]->b_data + (sb->s_blocksize - 8));
if (t->bigdirendname != cpu_to_le32(BIGDIRENDNAME) ||
t->bigdirendmasseq != h->startmasseq ||
t->reserved[0] != 0 || t->reserved[1] != 0)
goto out;
dir->parent_id = le32_to_cpu(h->bigdirparent);
dir->sb = sb;
return 0;
out:
for (i = 0; i < dir->nr_buffers; i++)
brelse(dir->bh[i]);
dir->sb = NULL;
return ret;
}
