btrfs: Replace owner argument in add_pinned_bytes with a boolean

add_pinned_bytes really cares whether the bytes being pinned are either
data or metadata. To that effect it checks whether the 'owner' argument
is less than BTRFS_FIRST_FREE_OBJECTID (256). This works because
owner can really have 2 types of values:

 a) For metadata extents it holds the level at which the parent is in
    the btree. This amounts to owner having the values 0-7

 b) In case of modifying data extents, owner is the inode number
    to which those extents belongs.

Let's make this more explicit byt converting the owner parameter to a
boolean value and either pass it directly when we know the type of
extents we are working with (i.e. in btrfs_free_tree_block). In cases
when the parent function can be called on both metadata/data extents
perform the check in the caller. This hopefully makes the interface
of add_pinned_bytes more intuitive.

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

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 51b5e2d..21ccf5c 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -744,12 +744,12 @@ static struct btrfs_space_info *__find_space_info(struct btrfs_fs_info *info,
 }
 
 static void add_pinned_bytes(struct btrfs_fs_info *fs_info, s64 num_bytes,
-                            u64 owner, u64 root_objectid)
+                            bool metadata, u64 root_objectid)
 {
        struct btrfs_space_info *space_info;
        u64 flags;
 
-       if (owner < BTRFS_FIRST_FREE_OBJECTID) {
+       if (metadata) {
                if (root_objectid == BTRFS_CHUNK_TREE_OBJECTID)
                        flags = BTRFS_BLOCK_GROUP_SYSTEM;
                else
@@ -2200,8 +2200,11 @@ int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
                                                 &old_ref_mod, &new_ref_mod);
        }
 
-       if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0)
-               add_pinned_bytes(fs_info, -num_bytes, owner, root_objectid);
+       if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0) {
+               bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID;
+
+               add_pinned_bytes(fs_info, -num_bytes, metadata, root_objectid);
+       }
 
        return ret;
 }
@@ -7266,7 +7269,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans,
        }
 out:
        if (pin)
-               add_pinned_bytes(fs_info, buf->len, btrfs_header_level(buf),
+               add_pinned_bytes(fs_info, buf->len, true,
                                 root->root_key.objectid);
 
        if (last_ref) {
@@ -7320,8 +7323,11 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans,
                                                 &old_ref_mod, &new_ref_mod);
        }
 
-       if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0)
-               add_pinned_bytes(fs_info, num_bytes, owner, root_objectid);
+       if (ret == 0 && old_ref_mod >= 0 && new_ref_mod < 0) {
+               bool metadata = owner < BTRFS_FIRST_FREE_OBJECTID;
+
+               add_pinned_bytes(fs_info, num_bytes, metadata, root_objectid);
+       }
 
        return ret;
 }