Btrfs: don't set for_cow parameter for tree block functions

Three callers of btrfs_free_tree_block or btrfs_alloc_tree_block passed
parameter for_cow = 1. In fact, these two functions should never mark
their tree modification operations as for_cow, because they can change
the number of blocks referenced by a tree.

Hence, we remove the extra for_cow parameter from these functions and
make them pass a zero down.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>

5 files changed, 20 insertions, 20 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 4106264fbc65..56485b3b7c31 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -255,7 +255,7 @@ int btrfs_copy_root(struct btrfs_trans_handle *trans,
 
         cow = btrfs_alloc_free_block(trans, root, buf->len, 0,
                                      new_root_objectid, &disk_key, level,
-                                     buf->start, 0, 1);
+                                     buf->start, 0);
         if (IS_ERR(cow))
                 return PTR_ERR(cow);
 
@@ -467,7 +467,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
 
         cow = btrfs_alloc_free_block(trans, root, buf->len, parent_start,
                                      root->root_key.objectid, &disk_key,
-                                     level, search_start, empty_size, 1);
+                                     level, search_start, empty_size);
         if (IS_ERR(cow))
                 return PTR_ERR(cow);
 
@@ -509,7 +509,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                 rcu_assign_pointer(root->node, cow);
 
                 btrfs_free_tree_block(trans, root, buf, parent_start,
-                                      last_ref, 1);
+                                      last_ref);
                 free_extent_buffer(buf);
                 add_root_to_dirty_list(root);
         } else {
@@ -525,7 +525,7 @@ static noinline int __btrfs_cow_block(struct btrfs_trans_handle *trans,
                                               trans->transid);
                 btrfs_mark_buffer_dirty(parent);
                 btrfs_free_tree_block(trans, root, buf, parent_start,
-                                      last_ref, 1);
+                                      last_ref);
         }
         if (unlock_orig)
                 btrfs_tree_unlock(buf);
@@ -987,7 +987,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
                 free_extent_buffer(mid);
 
                 root_sub_used(root, mid->len);
-                btrfs_free_tree_block(trans, root, mid, 0, 1, 0);
+                btrfs_free_tree_block(trans, root, mid, 0, 1);
                 /* once for the root ptr */
                 free_extent_buffer_stale(mid);
                 return 0;
@@ -1042,7 +1042,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
                         btrfs_tree_unlock(right);
                         del_ptr(trans, root, path, level + 1, pslot + 1);
                         root_sub_used(root, right->len);
-                        btrfs_free_tree_block(trans, root, right, 0, 1, 0);
+                        btrfs_free_tree_block(trans, root, right, 0, 1);
                         free_extent_buffer_stale(right);
                         right = NULL;
                 } else {
@@ -1084,7 +1084,7 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
                 btrfs_tree_unlock(mid);
                 del_ptr(trans, root, path, level + 1, pslot);
                 root_sub_used(root, mid->len);
-                btrfs_free_tree_block(trans, root, mid, 0, 1, 0);
+                btrfs_free_tree_block(trans, root, mid, 0, 1);
                 free_extent_buffer_stale(mid);
                 mid = NULL;
         } else {
@@ -2129,7 +2129,7 @@ static noinline int insert_new_root(struct btrfs_trans_handle *trans,
 
         c = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
                                    root->root_key.objectid, &lower_key,
-                                   level, root->node->start, 0, 0);
+                                   level, root->node->start, 0);
         if (IS_ERR(c))
                 return PTR_ERR(c);
 
@@ -2252,7 +2252,7 @@ static noinline int split_node(struct btrfs_trans_handle *trans,
 
         split = btrfs_alloc_free_block(trans, root, root->nodesize, 0,
                                         root->root_key.objectid,
-                                        &disk_key, level, c->start, 0, 0);
+                                        &disk_key, level, c->start, 0);
         if (IS_ERR(split))
                 return PTR_ERR(split);
 
@@ -3004,7 +3004,7 @@ again:
 
         right = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
                                         root->root_key.objectid,
-                                        &disk_key, 0, l->start, 0, 0);
+                                        &disk_key, 0, l->start, 0);
         if (IS_ERR(right))
                 return PTR_ERR(right);
 
@@ -3804,7 +3804,7 @@ static noinline void btrfs_del_leaf(struct btrfs_trans_handle *trans,
         root_sub_used(root, leaf->len);
 
         extent_buffer_get(leaf);
-        btrfs_free_tree_block(trans, root, leaf, 0, 1, 0);
+        btrfs_free_tree_block(trans, root, leaf, 0, 1);
         free_extent_buffer_stale(leaf);
 }
 /*
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index ec42a24e935e..e863188a3f17 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2496,11 +2496,11 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                                         struct btrfs_root *root, u32 blocksize,
                                         u64 parent, u64 root_objectid,
                                         struct btrfs_disk_key *key, int level,
-                                        u64 hint, u64 empty_size, int for_cow);
+                                        u64 hint, u64 empty_size);
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
                            struct btrfs_root *root,
                            struct extent_buffer *buf,
-                           u64 parent, int last_ref, int for_cow);
+                           u64 parent, int last_ref);
 struct extent_buffer *btrfs_init_new_buffer(struct btrfs_trans_handle *trans,
                                             struct btrfs_root *root,
                                             u64 bytenr, u32 blocksize,
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a7ffc88a7dbe..f43307492518 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1252,7 +1252,7 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
 
         leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
                                       BTRFS_TREE_LOG_OBJECTID, NULL,
-                                      0, 0, 0, 0);
+                                      0, 0, 0);
         if (IS_ERR(leaf)) {
                 kfree(root);
                 return ERR_CAST(leaf);
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 49fd7b66d57b..b68eb7ad05a7 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5217,7 +5217,7 @@ out:
 void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
                            struct btrfs_root *root,
                            struct extent_buffer *buf,
-                           u64 parent, int last_ref, int for_cow)
+                           u64 parent, int last_ref)
 {
         struct btrfs_block_group_cache *cache = NULL;
         int ret;
@@ -5227,7 +5227,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
                                         buf->start, buf->len,
                                         parent, root->root_key.objectid,
                                         btrfs_header_level(buf),
-                                        BTRFS_DROP_DELAYED_REF, NULL, for_cow);
+                                        BTRFS_DROP_DELAYED_REF, NULL, 0);
                 BUG_ON(ret); /* -ENOMEM */
         }
 
@@ -6249,7 +6249,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                                         struct btrfs_root *root, u32 blocksize,
                                         u64 parent, u64 root_objectid,
                                         struct btrfs_disk_key *key, int level,
-                                        u64 hint, u64 empty_size, int for_cow)
+                                        u64 hint, u64 empty_size)
 {
         struct btrfs_key ins;
         struct btrfs_block_rsv *block_rsv;
@@ -6297,7 +6297,7 @@ struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
                                         ins.objectid,
                                         ins.offset, parent, root_objectid,
                                         level, BTRFS_ADD_DELAYED_EXTENT,
-                                        extent_op, for_cow);
+                                        extent_op, 0);
                 BUG_ON(ret); /* -ENOMEM */
         }
         return buf;
@@ -6715,7 +6715,7 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
                                btrfs_header_owner(path->nodes[level + 1]));
         }
 
-        btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1, 0);
+        btrfs_free_tree_block(trans, root, eb, parent, wc->refs[level] == 1);
 out:
         wc->refs[level] = 0;
         wc->flags[level] = 0;
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 14f8e1faa46e..7f3a91367d77 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -367,7 +367,7 @@ static noinline int create_subvol(struct btrfs_root *root,
                 return PTR_ERR(trans);
 
         leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
-                                      0, objectid, NULL, 0, 0, 0, 0);
+                                      0, objectid, NULL, 0, 0, 0);
         if (IS_ERR(leaf)) {
                 ret = PTR_ERR(leaf);
                 goto fail;