Btrfs: add new sources for device replace code

This adds a new file to the sources together with the header file
and the changes to ioctl.h and ctree.h that are required by the
new C source file. Additionally, 4 new functions are added to
volume.c that deal with device creation and destruction.

Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 731e2875ab93..62006ba02719 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -123,6 +123,48 @@ struct btrfs_ioctl_scrub_args {
         __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
 };
 
+#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS    0
+#define BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID     1
+struct btrfs_ioctl_dev_replace_start_params {
+        __u64 srcdevid; /* in, if 0, use srcdev_name instead */
+        __u8 srcdev_name[BTRFS_PATH_NAME_MAX + 1];      /* in */
+        __u8 tgtdev_name[BTRFS_PATH_NAME_MAX + 1];      /* in */
+        __u64 cont_reading_from_srcdev_mode;    /* in, see #define
+                                                 * above */
+};
+
+#define BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED     0
+#define BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED           1
+#define BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED          2
+#define BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED          3
+#define BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED         4
+struct btrfs_ioctl_dev_replace_status_params {
+        __u64 replace_state;    /* out, see #define above */
+        __u64 progress_1000;    /* out, 0 <= x <= 1000 */
+        __u64 time_started;     /* out, seconds since 1-Jan-1970 */
+        __u64 time_stopped;     /* out, seconds since 1-Jan-1970 */
+        __u64 num_write_errors; /* out */
+        __u64 num_uncorrectable_read_errors;    /* out */
+};
+
+#define BTRFS_IOCTL_DEV_REPLACE_CMD_START                       0
+#define BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS                      1
+#define BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL                      2
+#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR                 0
+#define BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED              1
+#define BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED          2
+struct btrfs_ioctl_dev_replace_args {
+        __u64 cmd;      /* in */
+        __u64 result;   /* out */
+
+        union {
+                struct btrfs_ioctl_dev_replace_start_params start;
+                struct btrfs_ioctl_dev_replace_status_params status;
+        };      /* in/out */
+
+        __u64 spare[64];
+};
+
 #define BTRFS_DEVICE_PATH_NAME_MAX 1024
 struct btrfs_ioctl_dev_info_args {
         __u64 devid;                            /* in/out */
@@ -453,4 +495,7 @@ struct btrfs_ioctl_send_args {
                                struct btrfs_ioctl_qgroup_limit_args)
 #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
                                       struct btrfs_ioctl_get_dev_stats)
+#define BTRFS_IOC_DEV_REPLACE _IOWR(BTRFS_IOCTL_MAGIC, 53, \
+                                    struct btrfs_ioctl_dev_replace_args)
+
 #endif