1 files changed, 33 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 086e6bdae1c4..497c530724cf 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -266,6 +266,35 @@ struct btrfs_ioctl_logical_ino_args {
         __u64                           inodes;
 };
 
+enum btrfs_dev_stat_values {
+        /* disk I/O failure stats */
+        BTRFS_DEV_STAT_WRITE_ERRS, /* EIO or EREMOTEIO from lower layers */
+        BTRFS_DEV_STAT_READ_ERRS, /* EIO or EREMOTEIO from lower layers */
+        BTRFS_DEV_STAT_FLUSH_ERRS, /* EIO or EREMOTEIO from lower layers */
+
+        /* stats for indirect indications for I/O failures */
+        BTRFS_DEV_STAT_CORRUPTION_ERRS, /* checksum error, bytenr error or
+                                         * contents is illegal: this is an
+                                         * indication that the block was damaged
+                                         * during read or write, or written to
+                                         * wrong location or read from wrong
+                                         * location */
+        BTRFS_DEV_STAT_GENERATION_ERRS, /* an indication that blocks have not
+                                         * been written */
+
+        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, \
@@ -330,5 +359,9 @@ struct btrfs_ioctl_logical_ino_args {
                                         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