btrfs: Remove unused arguments from btrfs_changed_cb_t

btrfs_changed_cb_t represents the signature of the callback being passed
to btrfs_compare_trees. Currently there is only one such callback,
namely changed_cb in send.c. This function doesn't really uses the first
2 parameters, i.e. the roots. Since there are not other functions
implementing the btrfs_changed_cb_t let's remove the unused parameters
from the prototype and implementation.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 6d49db7..19b9c51 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -5496,8 +5496,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
                        goto out;
                } else if (left_end_reached) {
                        if (right_level == 0) {
-                               ret = changed_cb(left_root, right_root,
-                                               left_path, right_path,
+                               ret = changed_cb(left_path, right_path,
                                                &right_key,
                                                BTRFS_COMPARE_TREE_DELETED,
                                                ctx);
@@ -5508,8 +5507,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
                        continue;
                } else if (right_end_reached) {
                        if (left_level == 0) {
-                               ret = changed_cb(left_root, right_root,
-                                               left_path, right_path,
+                               ret = changed_cb(left_path, right_path,
                                                &left_key,
                                                BTRFS_COMPARE_TREE_NEW,
                                                ctx);
@@ -5523,8 +5521,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
                if (left_level == 0 && right_level == 0) {
                        cmp = btrfs_comp_cpu_keys(&left_key, &right_key);
                        if (cmp < 0) {
-                               ret = changed_cb(left_root, right_root,
-                                               left_path, right_path,
+                               ret = changed_cb(left_path, right_path,
                                                &left_key,
                                                BTRFS_COMPARE_TREE_NEW,
                                                ctx);
@@ -5532,8 +5529,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
                                        goto out;
                                advance_left = ADVANCE;
                        } else if (cmp > 0) {
-                               ret = changed_cb(left_root, right_root,
-                                               left_path, right_path,
+                               ret = changed_cb(left_path, right_path,
                                                &right_key,
                                                BTRFS_COMPARE_TREE_DELETED,
                                                ctx);
@@ -5550,8 +5546,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
                                        result = BTRFS_COMPARE_TREE_CHANGED;
                                else
                                        result = BTRFS_COMPARE_TREE_SAME;
-                               ret = changed_cb(left_root, right_root,
-                                                left_path, right_path,
+                               ret = changed_cb(left_path, right_path,
                                                 &left_key, result, ctx);
                                if (ret < 0)
                                        goto out;

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 8fc6903..16b3537 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2821,9 +2821,7 @@ enum btrfs_compare_tree_result {
        BTRFS_COMPARE_TREE_CHANGED,
        BTRFS_COMPARE_TREE_SAME,
 };
-typedef int (*btrfs_changed_cb_t)(struct btrfs_root *left_root,
-                                 struct btrfs_root *right_root,
-                                 struct btrfs_path *left_path,
+typedef int (*btrfs_changed_cb_t)(struct btrfs_path *left_path,
                                  struct btrfs_path *right_path,
                                  struct btrfs_key *key,
                                  enum btrfs_compare_tree_result result,

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index e4ad2fa..07445be 100644 (file)
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -6159,9 +6159,7 @@ out:
  * Updates compare related fields in sctx and simply forwards to the actual
  * changed_xxx functions.
  */
-static int changed_cb(struct btrfs_root *left_root,
-                     struct btrfs_root *right_root,
-                     struct btrfs_path *left_path,
+static int changed_cb(struct btrfs_path *left_path,
                      struct btrfs_path *right_path,
                      struct btrfs_key *key,
                      enum btrfs_compare_tree_result result,
@@ -6243,8 +6241,8 @@ static int full_send_tree(struct send_ctx *sctx)
                slot = path->slots[0];
                btrfs_item_key_to_cpu(eb, &found_key, slot);
 
-               ret = changed_cb(send_root, NULL, path, NULL,
-                               &found_key, BTRFS_COMPARE_TREE_NEW, sctx);
+               ret = changed_cb(path, NULL, &found_key,
+                                BTRFS_COMPARE_TREE_NEW, sctx);
                if (ret < 0)
                        goto out;