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Commit c11d2c23 authored by Stefan Behrens's avatar Stefan Behrens Committed by Josef Bacik
Browse files

Btrfs: add ioctl to get and reset the device stats 



An ioctl interface is added to get the device statistic counters.
A second ioctl is added to atomically get and reset these counters.

Signed-off-by: default avatarStefan Behrens <sbehrens@giantdisaster.de>
parent 442a4f63

fs/btrfs/ioctl.c

+26 −0
Original line number Diff line number Diff line
@@ -3046,6 +3046,28 @@ static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, 
	return ret;

}



static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root,

				      void __user *arg, int reset_after_read)

{

	struct btrfs_ioctl_get_dev_stats *sa;

	int ret;



	if (reset_after_read && !capable(CAP_SYS_ADMIN))

		return -EPERM;



	sa = memdup_user(arg, sizeof(*sa));

	if (IS_ERR(sa))

		return PTR_ERR(sa);



	ret = btrfs_get_dev_stats(root, sa, reset_after_read);



	if (copy_to_user(arg, sa, sizeof(*sa)))

		ret = -EFAULT;



	kfree(sa);

	return ret;

}



static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg)

{

	int ret = 0;
@@ -3434,6 +3456,10 @@ long btrfs_ioctl(struct file *file, unsigned int 
		return btrfs_ioctl_balance_ctl(root, arg);

	case BTRFS_IOC_BALANCE_PROGRESS:

		return btrfs_ioctl_balance_progress(root, argp);

	case BTRFS_IOC_GET_DEV_STATS:

		return btrfs_ioctl_get_dev_stats(root, argp, 0);

	case BTRFS_IOC_GET_AND_RESET_DEV_STATS:

		return btrfs_ioctl_get_dev_stats(root, argp, 1);

	}



	return -ENOTTY;

fs/btrfs/ioctl.h

+14 −0
Original line number Diff line number Diff line
@@ -285,6 +285,16 @@ enum btrfs_dev_stat_values { 
	BTRFS_DEV_STAT_VALUES_MAX

};



struct btrfs_ioctl_get_dev_stats {

	__u64 devid;				/* in */

	__u64 nr_items;				/* in/out */



	/* out values: */

	__u64 values[BTRFS_DEV_STAT_VALUES_MAX];



	__u64 unused[128 - 2 - BTRFS_DEV_STAT_VALUES_MAX]; /* pad to 1k */

};



#define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \

				   struct btrfs_ioctl_vol_args)

#define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \
@@ -349,5 +359,9 @@ enum btrfs_dev_stat_values { 
					struct btrfs_ioctl_ino_path_args)

#define BTRFS_IOC_LOGICAL_INO _IOWR(BTRFS_IOCTL_MAGIC, 36, \

					struct btrfs_ioctl_ino_path_args)

#define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \

				      struct btrfs_ioctl_get_dev_stats)

#define BTRFS_IOC_GET_AND_RESET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 53, \

					struct btrfs_ioctl_get_dev_stats)



#endif

fs/btrfs/volumes.c

+34 −0
Original line number Diff line number Diff line
@@ -4673,3 +4673,37 @@ void btrfs_dev_stat_print_on_error(struct btrfs_device *dev) 
			   btrfs_dev_stat_read(dev,

					       BTRFS_DEV_STAT_GENERATION_ERRS));

}



int btrfs_get_dev_stats(struct btrfs_root *root,

			struct btrfs_ioctl_get_dev_stats *stats,

			int reset_after_read)

{

	struct btrfs_device *dev;

	struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;

	int i;



	mutex_lock(&fs_devices->device_list_mutex);

	dev = btrfs_find_device(root, stats->devid, NULL, NULL);

	mutex_unlock(&fs_devices->device_list_mutex);



	if (!dev) {

		printk(KERN_WARNING

		       "btrfs: get dev_stats failed, device not found\n");

		return -ENODEV;

	} else if (reset_after_read) {

		for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++) {

			if (stats->nr_items > i)

				stats->values[i] =

					btrfs_dev_stat_read_and_reset(dev, i);

			else

				btrfs_dev_stat_reset(dev, i);

		}

	} else {

		for (i = 0; i < BTRFS_DEV_STAT_VALUES_MAX; i++)

			if (stats->nr_items > i)

				stats->values[i] = btrfs_dev_stat_read(dev, i);

	}

	if (stats->nr_items > BTRFS_DEV_STAT_VALUES_MAX)

		stats->nr_items = BTRFS_DEV_STAT_VALUES_MAX;

	return 0;

}

fs/btrfs/volumes.h

+3 −0
Original line number Diff line number Diff line
@@ -290,6 +290,9 @@ struct btrfs_device *btrfs_find_device_for_logical(struct btrfs_root *root, 
						   u64 logical, int mirror_num);

void btrfs_dev_stat_print_on_error(struct btrfs_device *device);

void btrfs_dev_stat_inc_and_print(struct btrfs_device *dev, int index);

int btrfs_get_dev_stats(struct btrfs_root *root,

			struct btrfs_ioctl_get_dev_stats *stats,

			int reset_after_read);



static inline void btrfs_dev_stat_inc(struct btrfs_device *dev,

				      int index)