原文:http://blog.sina.com.cn/s/blog_5219094a01009a4c.html
super block
相關的數據結構爲:
struct super_block {
struct list_head s_list;
dev_t s_dev;
unsigned long s_blocksize;
unsigned long s_old_blocksize;
unsigned char s_blocksize_bits;
unsigned char s_dirt;
unsigned long long s_maxbytes;
struct file_system_type *s_type;
struct super_operations *s_op;
struct dquot_operations *dq_op;
struct quotactl_ops *s_qcop;
struct export_operations *s_export_op;
unsigned long s_flags;
unsigned long s_magic;
struct dentry *s_root;
struct rw_semaphore s_umount;
struct semaphore s_lock;
int s_count;
int s_syncing;
int s_need_sync_fs;
atomic_t s_active;
void *s_security;
struct xattr_handler **s_xattr;
struct list_head s_inodes;
struct list_head s_dirty;
struct list_head s_io;
struct hlist_head s_anon;
struct list_head s_files;
struct block_device *s_bdev;
struct list_head s_instances;
struct quota_info s_dquot;
int s_frozen;
wait_queue_head_t s_wait_unfrozen;
char s_id[32];
void *s_fs_info;
struct semaphore s_vfs_rename_sem;
u32 s_time_gran;
};
super_block存在於兩個鏈表中,一個是系統所有super_block的鏈表, 一個是對於特定的文件系統的super_block鏈表.
所有的super_block都存在於 super-blocks 鏈表中:
/------------\
