btrfs: move btrfs_cmp_device_free_bytes to super.c

this function won't be used here anymore, so move it super.c where it is
used for df-calculation

3 files changed, 26 insertions, 28 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 0ac712efcdf2..32fe8b33cc1c 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -913,6 +913,32 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
         return 0;
 }
 
+/* Used to sort the devices by max_avail(descending sort) */
+static int btrfs_cmp_device_free_bytes(const void *dev_info1,
+                                       const void *dev_info2)
+{
+        if (((struct btrfs_device_info *)dev_info1)->max_avail >
+            ((struct btrfs_device_info *)dev_info2)->max_avail)
+                return -1;
+        else if (((struct btrfs_device_info *)dev_info1)->max_avail <
+                 ((struct btrfs_device_info *)dev_info2)->max_avail)
+                return 1;
+        else
+        return 0;
+}
+
+/*
+ * sort the devices by max_avail, in which max free extent size of each device
+ * is stored.(Descending Sort)
+ */
+static inline void btrfs_descending_sort_devices(
+                                        struct btrfs_device_info *devices,
+                                        size_t nr_devices)
+{
+        sort(devices, nr_devices, sizeof(struct btrfs_device_info),
+             btrfs_cmp_device_free_bytes, NULL);
+}
+
 /*
  * The helper to calc the free space on the devices that can be used to store
  * file data.
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 8b9fb8c7683d..a9f1fc23278b 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -2282,19 +2282,6 @@ static noinline u64 chunk_bytes_by_type(u64 type, u64 calc_size,
                 return calc_size * num_stripes;
 }
 
-/* Used to sort the devices by max_avail(descending sort) */
-int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2)
-{
-        if (((struct btrfs_device_info *)dev_info1)->max_avail >
-            ((struct btrfs_device_info *)dev_info2)->max_avail)
-                return -1;
-        else if (((struct btrfs_device_info *)dev_info1)->max_avail <
-                 ((struct btrfs_device_info *)dev_info2)->max_avail)
-                return 1;
-        else
-                return 0;
-}
-
 static int __btrfs_calc_nstripes(struct btrfs_fs_devices *fs_devices, u64 type,
                                  int *num_stripes, int *min_stripes,
                                  int *sub_stripes)
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index cc2eadaf7a27..b502f01f79ed 100644
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -157,21 +157,6 @@ struct map_lookup {
         struct btrfs_bio_stripe stripes[];
 };
 
-/* Used to sort the devices by max_avail(descending sort) */
-int btrfs_cmp_device_free_bytes(const void *dev_info1, const void *dev_info2);
-
-/*
- * sort the devices by max_avail, in which max free extent size of each device
- * is stored.(Descending Sort)
- */
-static inline void btrfs_descending_sort_devices(
-                                        struct btrfs_device_info *devices,
-                                        size_t nr_devices)
-{
-        sort(devices, nr_devices, sizeof(struct btrfs_device_info),
-             btrfs_cmp_device_free_bytes, NULL);
-}
-
 int btrfs_account_dev_extents_size(struct btrfs_device *device, u64 start,
                                    u64 end, u64 *length);