btrfs: new ioctls for scrub

adds ioctls necessary to start and cancel scrubs, to get current
progress and to get info about devices to be scrubbed.
Note that the scrub is done per-device and that the ioctl only
returns after the scrub for this devices is finished or has been
canceled.

Signed-off-by: Arne Jansen <sensille@gmx.net>

1 files changed, 38 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
index 37ac030d64b4..1a638ceeead8 100644
--- a/fs/btrfs/ioctl.h
+++ b/fs/btrfs/ioctl.h
@@ -32,6 +32,8 @@ struct btrfs_ioctl_vol_args {
 
 #define BTRFS_SUBVOL_CREATE_ASYNC       (1ULL << 0)
 #define BTRFS_SUBVOL_RDONLY             (1ULL << 1)
+#define BTRFS_FSID_SIZE 16
+#define BTRFS_UUID_SIZE 16
 
 #define BTRFS_SUBVOL_NAME_MAX 4039
 struct btrfs_ioctl_vol_args_v2 {
@@ -79,6 +81,33 @@ struct btrfs_scrub_progress {
                                          * Intermittent error. */
 };
 
+struct btrfs_ioctl_scrub_args {
+        __u64 devid;                            /* in */
+        __u64 start;                            /* in */
+        __u64 end;                              /* in */
+        __u64 flags;                            /* in */
+        struct btrfs_scrub_progress progress;   /* out */
+        /* pad to 1k */
+        __u64 unused[(1024-32-sizeof(struct btrfs_scrub_progress))/8];
+};
+
+#define BTRFS_DEVICE_PATH_NAME_MAX 1024
+struct btrfs_ioctl_dev_info_args {
+        __u64 devid;                            /* in/out */
+        __u8 uuid[BTRFS_UUID_SIZE];             /* in/out */
+        __u64 bytes_used;                       /* out */
+        __u64 total_bytes;                      /* out */
+        __u64 unused[379];                      /* pad to 4k */
+        __u8 path[BTRFS_DEVICE_PATH_NAME_MAX];  /* out */
+};
+
+struct btrfs_ioctl_fs_info_args {
+        __u64 max_id;                           /* out */
+        __u64 num_devices;                      /* out */
+        __u8 fsid[BTRFS_FSID_SIZE];             /* out */
+        __u64 reserved[124];                    /* pad to 1k */
+};
+
 #define BTRFS_INO_LOOKUP_PATH_MAX 4080
 struct btrfs_ioctl_ino_lookup_args {
         __u64 treeid;
@@ -240,4 +269,13 @@ struct btrfs_ioctl_space_args {
                                    struct btrfs_ioctl_vol_args_v2)
 #define BTRFS_IOC_SUBVOL_GETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 25, __u64)
 #define BTRFS_IOC_SUBVOL_SETFLAGS _IOW(BTRFS_IOCTL_MAGIC, 26, __u64)
+#define BTRFS_IOC_SCRUB _IOWR(BTRFS_IOCTL_MAGIC, 27, \
+                              struct btrfs_ioctl_scrub_args)
+#define BTRFS_IOC_SCRUB_CANCEL _IO(BTRFS_IOCTL_MAGIC, 28)
+#define BTRFS_IOC_SCRUB_PROGRESS _IOWR(BTRFS_IOCTL_MAGIC, 29, \
+                                       struct btrfs_ioctl_scrub_args)
+#define BTRFS_IOC_DEV_INFO _IOWR(BTRFS_IOCTL_MAGIC, 30, \
+                                 struct btrfs_ioctl_dev_info_args)
+#define BTRFS_IOC_FS_INFO _IOR(BTRFS_IOCTL_MAGIC, 31, \
+                               struct btrfs_ioctl_fs_info_args)
 #endif