int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
struct nilfs_checkpoint *raw_cp;
struct buffer_head *bh_cp;
int err;
down_write(&nilfs->ns_sem);
list_add(&sbi->s_list, &nilfs->ns_supers);
up_write(&nilfs->ns_sem);
sbi->s_ifile = nilfs_mdt_new(
nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP);
if (!sbi->s_ifile)
return -ENOMEM;
err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size);
if (unlikely(err))
goto failed;
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
&bh_cp);
if (unlikely(err)) {
if (err == -ENOENT || err == -EINVAL) {
printk(KERN_ERR
"NILFS: Invalid checkpoint "
"(checkpoint number=%llu)\n",
(unsigned long long)cno);
err = -EINVAL;
}
goto failed;
}
err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode);
if (unlikely(err))
goto failed_bh;
atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
nilfs_debug(2, "attached ifile (checkpoint number=%llu)\n",
(unsigned long long)cno);
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
return 0;
failed_bh:
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
failed:
nilfs_debug(1, "failed to attach ifile "
"(checkpoint number=%llu, err=%d)\n",
(unsigned long long)cno, err);
nilfs_mdt_destroy(sbi->s_ifile);
sbi->s_ifile = NULL;
down_write(&nilfs->ns_sem);
list_del_init(&sbi->s_list);
up_write(&nilfs->ns_sem);
return err;
}
int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
struct nilfs_root **rootp)
{
struct the_nilfs *nilfs = sb->s_fs_info;
struct nilfs_root *root;
struct nilfs_checkpoint *raw_cp;
struct buffer_head *bh_cp;
int err = -ENOMEM;
root = nilfs_find_or_create_root(
nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
if (!root)
return err;
if (root->ifile)
goto reuse; /* already attached checkpoint */
down_read(&nilfs->ns_segctor_sem);
err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
&bh_cp);
up_read(&nilfs->ns_segctor_sem);
if (unlikely(err)) {
if (err == -ENOENT || err == -EINVAL) {
printk(KERN_ERR
"NILFS: Invalid checkpoint "
"(checkpoint number=%llu)\n",
(unsigned long long)cno);
err = -EINVAL;
}
goto failed;
}
err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
&raw_cp->cp_ifile_inode, &root->ifile);
if (err)
goto failed_bh;
atomic64_set(&root->inodes_count,
le64_to_cpu(raw_cp->cp_inodes_count));
atomic64_set(&root->blocks_count,
le64_to_cpu(raw_cp->cp_blocks_count));
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
reuse:
*rootp = root;
return 0;
failed_bh:
nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
failed:
nilfs_put_root(root);
return err;
}
