proc_misc.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 645 行 · 第 1/2 页

	.release	= seq_release,
};

#ifdef CONFIG_MODULES
extern struct seq_operations modules_op;
static int modules_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &modules_op);
}
static struct file_operations proc_modules_operations = {
	.open		= modules_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};
#endif

extern struct seq_operations slabinfo_op;
extern ssize_t slabinfo_write(struct file *, const char __user *, size_t, loff_t *);
static int slabinfo_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &slabinfo_op);
}
static struct file_operations proc_slabinfo_operations = {
	.open		= slabinfo_open,
	.read		= seq_read,
	.write		= slabinfo_write,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

int show_stat(struct seq_file *p, void *v)
{
	int i;
	extern unsigned long total_forks;
	unsigned long jif;
	u64	sum = 0, user = 0, nice = 0, system = 0,
		idle = 0, iowait = 0, irq = 0, softirq = 0;

	jif = - wall_to_monotonic.tv_sec;
	if (wall_to_monotonic.tv_nsec)
		--jif;

	for_each_cpu(i) {
		int j;

		user += kstat_cpu(i).cpustat.user;
		nice += kstat_cpu(i).cpustat.nice;
		system += kstat_cpu(i).cpustat.system;
		idle += kstat_cpu(i).cpustat.idle;
		iowait += kstat_cpu(i).cpustat.iowait;
		irq += kstat_cpu(i).cpustat.irq;
		softirq += kstat_cpu(i).cpustat.softirq;
		for (j = 0 ; j < NR_IRQS ; j++)
			sum += kstat_cpu(i).irqs[j];
	}

	seq_printf(p, "cpu  %llu %llu %llu %llu %llu %llu %llu\n",
		(unsigned long long)jiffies_64_to_clock_t(user),
		(unsigned long long)jiffies_64_to_clock_t(nice),
		(unsigned long long)jiffies_64_to_clock_t(system),
		(unsigned long long)jiffies_64_to_clock_t(idle),
		(unsigned long long)jiffies_64_to_clock_t(iowait),
		(unsigned long long)jiffies_64_to_clock_t(irq),
		(unsigned long long)jiffies_64_to_clock_t(softirq));
	for_each_online_cpu(i) {

		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
		user = kstat_cpu(i).cpustat.user;
		nice = kstat_cpu(i).cpustat.nice;
		system = kstat_cpu(i).cpustat.system;
		idle = kstat_cpu(i).cpustat.idle;
		iowait = kstat_cpu(i).cpustat.iowait;
		irq = kstat_cpu(i).cpustat.irq;
		softirq = kstat_cpu(i).cpustat.softirq;
		seq_printf(p, "cpu%d %llu %llu %llu %llu %llu %llu %llu\n",
			i,
			(unsigned long long)jiffies_64_to_clock_t(user),
			(unsigned long long)jiffies_64_to_clock_t(nice),
			(unsigned long long)jiffies_64_to_clock_t(system),
			(unsigned long long)jiffies_64_to_clock_t(idle),
			(unsigned long long)jiffies_64_to_clock_t(iowait),
			(unsigned long long)jiffies_64_to_clock_t(irq),
			(unsigned long long)jiffies_64_to_clock_t(softirq));
	}
	seq_printf(p, "intr %llu", (unsigned long long)sum);

#if !defined(CONFIG_PPC64) && !defined(CONFIG_ALPHA)
	for (i = 0; i < NR_IRQS; i++)
		seq_printf(p, " %u", kstat_irqs(i));
#endif

	seq_printf(p,
		"\nctxt %llu\n"
		"btime %lu\n"
		"processes %lu\n"
		"procs_running %lu\n"
		"procs_blocked %lu\n",
		nr_context_switches(),
		(unsigned long)jif,
		total_forks,
		nr_running(),
		nr_iowait());

	return 0;
}

static int stat_open(struct inode *inode, struct file *file)
{
	unsigned size = 4096 * (1 + num_possible_cpus() / 32);
	char *buf;
	struct seq_file *m;
	int res;

	/* don't ask for more than the kmalloc() max size, currently 128 KB */
	if (size > 128 * 1024)
		size = 128 * 1024;
	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	res = single_open(file, show_stat, NULL);
	if (!res) {
		m = file->private_data;
		m->buf = buf;
		m->size = size;
	} else
		kfree(buf);
	return res;
}
static struct file_operations proc_stat_operations = {
	.open		= stat_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int devices_read_proc(char *page, char **start, off_t off,
				 int count, int *eof, void *data)
{
	int len = get_chrdev_list(page);
	len += get_blkdev_list(page+len);
	return proc_calc_metrics(page, start, off, count, eof, len);
}

/*
 * /proc/interrupts
 */
static void *int_seq_start(struct seq_file *f, loff_t *pos)
{
	return (*pos <= NR_IRQS) ? pos : NULL;
}

static void *int_seq_next(struct seq_file *f, void *v, loff_t *pos)
{
	(*pos)++;
	if (*pos > NR_IRQS)
		return NULL;
	return pos;
}

static void int_seq_stop(struct seq_file *f, void *v)
{
	/* Nothing to do */
}


extern int show_interrupts(struct seq_file *f, void *v); /* In arch code */
static struct seq_operations int_seq_ops = {
	.start = int_seq_start,
	.next  = int_seq_next,
	.stop  = int_seq_stop,
	.show  = show_interrupts
};

int interrupts_open(struct inode *inode, struct file *filp)
{
	return seq_open(filp, &int_seq_ops);
}

static struct file_operations proc_interrupts_operations = {
	.open		= interrupts_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int filesystems_read_proc(char *page, char **start, off_t off,
				 int count, int *eof, void *data)
{
	int len = get_filesystem_list(page);
	return proc_calc_metrics(page, start, off, count, eof, len);
}

static int cmdline_read_proc(char *page, char **start, off_t off,
				 int count, int *eof, void *data)
{
	int len;

	len = sprintf(page, "%s\n", saved_command_line);
	return proc_calc_metrics(page, start, off, count, eof, len);
}

static int locks_read_proc(char *page, char **start, off_t off,
				 int count, int *eof, void *data)
{
	int len = get_locks_status(page, start, off, count);

	if (len < count)
		*eof = 1;
	return len;
}

static int execdomains_read_proc(char *page, char **start, off_t off,
				 int count, int *eof, void *data)
{
	int len = get_exec_domain_list(page);
	return proc_calc_metrics(page, start, off, count, eof, len);
}

#ifdef CONFIG_MAGIC_SYSRQ
/*
 * writing 'C' to /proc/sysrq-trigger is like sysrq-C
 */
static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
				   size_t count, loff_t *ppos)
{
	if (count) {
		char c;

		if (get_user(c, buf))
			return -EFAULT;
		__handle_sysrq(c, NULL, NULL);
	}
	return count;
}

static struct file_operations proc_sysrq_trigger_operations = {
	.write		= write_sysrq_trigger,
};
#endif

struct proc_dir_entry *proc_root_kcore;

static void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
{
	struct proc_dir_entry *entry;
	entry = create_proc_entry(name, mode, NULL);
	if (entry)
		entry->proc_fops = f;
}

void __init proc_misc_init(void)
{
	struct proc_dir_entry *entry;
	static struct {
		char *name;
		int (*read_proc)(char*,char**,off_t,int,int*,void*);
	} *p, simple_ones[] = {
		{"loadavg",     loadavg_read_proc},
		{"uptime",	uptime_read_proc},
		{"meminfo",	meminfo_read_proc},
		{"version",	version_read_proc},
#ifdef CONFIG_PROC_HARDWARE
		{"hardware",	hardware_read_proc},
#endif
#ifdef CONFIG_STRAM_PROC
		{"stram",	stram_read_proc},
#endif
		{"devices",	devices_read_proc},
		{"filesystems",	filesystems_read_proc},
		{"cmdline",	cmdline_read_proc},
		{"locks",	locks_read_proc},
		{"execdomains",	execdomains_read_proc},
		{NULL,}
	};
	for (p = simple_ones; p->name; p++)
		create_proc_read_entry(p->name, 0, NULL, p->read_proc, NULL);

	proc_symlink("mounts", NULL, "self/mounts");

	/* And now for trickier ones */
	entry = create_proc_entry("kmsg", S_IRUSR, &proc_root);
	if (entry)
		entry->proc_fops = &proc_kmsg_operations;
	create_seq_entry("cpuinfo", 0, &proc_cpuinfo_operations);
	create_seq_entry("partitions", 0, &proc_partitions_operations);
	create_seq_entry("stat", 0, &proc_stat_operations);
	create_seq_entry("interrupts", 0, &proc_interrupts_operations);
	create_seq_entry("slabinfo",S_IWUSR|S_IRUGO,&proc_slabinfo_operations);
	create_seq_entry("buddyinfo",S_IRUGO, &fragmentation_file_operations);
	create_seq_entry("vmstat",S_IRUGO, &proc_vmstat_file_operations);
	create_seq_entry("diskstats", 0, &proc_diskstats_operations);
#ifdef CONFIG_MODULES
	create_seq_entry("modules", 0, &proc_modules_operations);
#endif
#ifdef CONFIG_SCHEDSTATS
	create_seq_entry("schedstat", 0, &proc_schedstat_operations);
#endif
#ifdef CONFIG_PROC_KCORE
	proc_root_kcore = create_proc_entry("kcore", S_IRUSR, NULL);
	if (proc_root_kcore) {
		proc_root_kcore->proc_fops = &proc_kcore_operations;
		proc_root_kcore->size =
				(size_t)high_memory - PAGE_OFFSET + PAGE_SIZE;
	}
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	entry = create_proc_entry("sysrq-trigger", S_IWUSR, NULL);
	if (entry)
		entry->proc_fops = &proc_sysrq_trigger_operations;
#endif
#ifdef CONFIG_PPC32
	{
		extern struct file_operations ppc_htab_operations;
		entry = create_proc_entry("ppc_htab", S_IRUGO|S_IWUSR, NULL);
		if (entry)
			entry->proc_fops = &ppc_htab_operations;
	}
#endif
}