diff options
| -rw-r--r-- | fs/btrfs/ioctl.c | 26 | ||||
| -rw-r--r-- | fs/btrfs/ioctl.h | 14 | ||||
| -rw-r--r-- | fs/btrfs/volumes.c | 34 | ||||
| -rw-r--r-- | fs/btrfs/volumes.h | 3 |
4 files changed, 77 insertions, 0 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 15baf945630..0f8c354c4c7 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -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; diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h index 5bf05e28b82..497c530724c 100644 --- a/fs/btrfs/ioctl.h +++ b/fs/btrfs/ioctl.h @@ -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 diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 2915521f44e..a112b758822 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -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; +} diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 193b2835e6a..6798f8674b1 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -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) |