int logfs_init_journal(struct super_block *sb)
{
struct logfs_super *super = logfs_super(sb);
size_t bufsize = max_t(size_t, sb->s_blocksize, super->s_writesize)
+ MAX_JOURNAL_HEADER;
int ret = -ENOMEM;
mutex_init(&super->s_journal_mutex);
btree_init_mempool32(&super->s_reserved_segments, super->s_btree_pool);
super->s_je = kzalloc(bufsize, GFP_KERNEL);
if (!super->s_je)
return ret;
super->s_compressed_je = kzalloc(bufsize, GFP_KERNEL);
if (!super->s_compressed_je)
return ret;
super->s_master_inode = logfs_new_meta_inode(sb, LOGFS_INO_MASTER);
if (IS_ERR(super->s_master_inode))
return PTR_ERR(super->s_master_inode);
ret = logfs_read_journal(sb);
if (ret)
return -EIO;
reserve_sb_and_journal(sb);
logfs_calc_free(sb);
super->s_journal_area->a_ops = &journal_area_ops;
return 0;
}
struct inode *logfs_read_meta_inode(struct super_block *sb, u64 ino)
{
struct inode *inode;
int err;
inode = logfs_new_meta_inode(sb, ino);
if (IS_ERR(inode))
return inode;
err = logfs_read_inode(inode);
if (err) {
iput(inode);
return ERR_PTR(err);
}
logfs_inode_setops(inode);
return inode;
}