Btrfs: add device counters for detected IO and checksum errors

[linux-2.6-block.git] / fs / btrfs / ioctl.h

diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 086e6bdae1c4482b93b6dda4d16b1c5af288f2eb..5bf05e28b829a8f973b839902648bdca46b7b83e 100644 (file)
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -266,6 +266,25 @@ 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
+};
+
 #define BTRFS_IOC_SNAP_CREATE _IOW(BTRFS_IOCTL_MAGIC, 1, \
                                   struct btrfs_ioctl_vol_args)
 #define BTRFS_IOC_DEFRAG _IOW(BTRFS_IOCTL_MAGIC, 2, \