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Btrfs: add ioctl to get and reset the device stats

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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: Stefan Behrens <sbehrens@giantdisaster.de>
This commit is contained in:
Stefan Behrens
2012-05-25 16:06:09 +02:00
committed by Josef Bacik
parent 442a4f6308
commit c11d2c236c
4 changed files with 77 additions and 0 deletions
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26
fs/btrfs/ioctl.c
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@ -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;