start_kernel()-->vfs_caches_init_early();-->dcache_init_early();-->static struct hlist_head *dentry_hashtabl = alloc_large_system_hash("Dentry cache",sizeof(struct hlist_head),dhash_entries,13,HASH_EARLY,&d_hash_shift,&d_hash_mask,0);-->inode_init_early();-->static struct hlist_head *inode_hashtable = alloc_large_system_hash("Inode-cache",sizeof(struct hlist_head),ihash_entries,14,HASH_EARLY,&i_hash_shift,&i_hash_mask,0);-->vfs_caches_init(num_physpages);/*1.kmem_cache用于名字*/-->struct kmem_cache *names_cachep = kmem_cache_create("names_cache", PATH_MAX, 0,SLAB_HWCACHE_ALIGN|SLAB_PANIC, NULL);-->dcache_init();/*2.kmem_cache用于缓存dentry目录项*/-->struct kmem_cache *dentry_cache = KMEM_CACHE(dentry,SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD);-->inode_init();/*3.kmem_cache用于缓存inode*/-->struct kmem_cache *inode_cachep = kmem_cache_create("inode_cache",sizeof(struct inode),0,(SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD),init_once);-->files_init(mempages);/*4.kmem_cache用于缓存file结构体*/-->struct kmem_cache *filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);-->mnt_init();/*5.kmem_cache用于缓存vfsmount结构体*/-->struct kmem_cache *mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct vfsmount),0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);-->static struct list_head *mount_hashtable =(struct list_head *)__get_free_page(GFP_ATOMIC);/*注册&挂载sysfs虚拟文件系统*/-->sysfs_init()/*6.kmem_cache用于缓存sysfs_dirent结构体*/-->struct kmem_cache *sysfs_dir_cachep = kmem_cache_create("sysfs_dir_cache",/*对应的应该就是"/fs/"跟目录*/                      sizeof(struct sysfs_dirent),0, 0, NULL);-->fs_kobj = kobject_create_and_add("fs", NULL);/*注册rootfs虚拟文件系统*/-->init_rootfs();/*挂载rootfs虚拟文件系统*/-->init_mount_tree();-->bdev_cache_init();/*7.kmem_cache用于缓存bdev_inode结构体*/-->struct kmem_cache *bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode),0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|SLAB_PANIC),init_once);/*注册的这是啥文件系统啊？*/-->register_filesystem(&bd_type);/*挂载*/-->struct vfsmount *bd_mnt = kern_mount(&bd_type);-->struct super_block *blockdev_superblock = bd_mnt->mnt_sb;    /* For writeback *//*字符设备相关的初始化*/-->chrdev_init();