1.sbi = kzalloc(sizeof(struct pcmfs_sb_info), GFP_KERNEL);申请内存超级快的空间,然后把磁盘超级块的内容拷贝到其中。在此处需要把VFS的 s->s_fs_info = sbi;赋值,即全局有很多文件系统数据结构,如ext2,ext3等。此处即指定当前为该sb代表的文件系统


i = (sbi->s_imap_blocks + sbi->s_zmap_blocks) * sizeof(bh);

map = kzalloc(i, GFP_KERNEL);//step2:申请空间2 bitmap位
root_inode = pcmfs_iget(s, PCMFS_ROOT_INO);
Category: 文件系统 | Tags: | Read Count: 593
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