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/* * Statistics gathering.. */struct inodes_stat_t inodes_stat;static DEFINE_PER_CPU(unsigned long, nr_inodes); 所有分配使用的inodestatic DEFINE_PER_CPU(unsigned long, nr_unused);未使用的inode

static long get_nr_inodes(void){	int i;	long sum = 0;	for_each_possible_cpu(i)		sum += per_cpu(nr_inodes, i);	return sum < 0 ? 0 : sum;}static inline long get_nr_inodes_unused(void){	int i;	long sum = 0;	for_each_possible_cpu(i)		sum += per_cpu(nr_unused, i);	return sum < 0 ? 0 : sum;}long get_nr_dirty_inodes(void){	/* not actually dirty inodes, but a wild approximation */	long nr_dirty = get_nr_inodes() - get_nr_inodes_unused();	return nr_dirty > 0 ? nr_dirty : 0;}

struct inodes_stat_t {	long nr_inodes;	long nr_unused;	long dummy[5];		/* padding for sysctl ABI compatibility */};

/* * Handle nr_inode sysctl */#ifdef CONFIG_SYSCTLint proc_nr_inodes(struct ctl_table *table, int write,		   void __user *buffer, size_t *lenp, loff_t *ppos){	inodes_stat.nr_inodes = get_nr_inodes();	inodes_stat.nr_unused = get_nr_inodes_unused();	return proc_doulongvec_minmax(table, write, buffer, lenp, ppos);}#endif

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