Commit 4785e24f authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: don't take an extra root ref at allocation time 



Now that all the users of roots take references for them we can drop the
extra root ref we've been taking.  Before we had roots at 2 refs for the
life of the file system, one for the radix tree, and one simply for
existing.  Now that we have proper ref accounting in all places that use
roots we can drop this extra ref simply for existing as we no longer
need it.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent dc9492c1

fs/btrfs/disk-io.c

+6 −14
Original line number Diff line number Diff line
@@ -1601,22 +1601,11 @@ again: 
	if (ret == 0)

		set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state);



	/*

	 * All roots have two refs on them at all times, one for the mounted fs,

	 * and one for being in the radix tree.  This way we only free the root

	 * when we are unmounting or deleting the subvolume.  We get one ref

	 * from __setup_root, one for inserting it into the radix tree, and then

	 * we have the third for returning it, and the caller will put it when

	 * it's done with the root.

	 */

	btrfs_grab_root(root);

	ret = btrfs_insert_fs_root(fs_info, root);

	if (ret) {

		btrfs_put_root(root);

		if (ret == -EEXIST) {

			btrfs_put_root(root);

		if (ret == -EEXIST)

			goto again;

		}

		goto fail;

	}

	return root;
@@ -3904,11 +3893,13 @@ int write_all_supers(struct btrfs_fs_info *fs_info, int max_mirrors) 
void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info,

				  struct btrfs_root *root)

{

	bool drop_ref = false;



	spin_lock(&fs_info->fs_roots_radix_lock);

	radix_tree_delete(&fs_info->fs_roots_radix,

			  (unsigned long)root->root_key.objectid);

	if (test_and_clear_bit(BTRFS_ROOT_IN_RADIX, &root->state))

		btrfs_put_root(root);

		drop_ref = true;

	spin_unlock(&fs_info->fs_roots_radix_lock);



	if (btrfs_root_refs(&root->root_item) == 0)
@@ -3930,6 +3921,7 @@ void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, 
		iput(root->ino_cache_inode);

		root->ino_cache_inode = NULL;

	}

	if (drop_ref)

		btrfs_put_root(root);

}

fs/btrfs/tests/qgroup-tests.c

+2 −0
Original line number Diff line number Diff line
@@ -507,6 +507,7 @@ int btrfs_test_qgroups(u32 sectorsize, u32 nodesize) 
		test_err("couldn't insert fs root %d", ret);

		goto out;

	}

	btrfs_put_root(tmp_root);



	tmp_root = btrfs_alloc_dummy_root(fs_info);

	if (IS_ERR(tmp_root)) {
@@ -521,6 +522,7 @@ int btrfs_test_qgroups(u32 sectorsize, u32 nodesize) 
		test_err("couldn't insert fs root %d", ret);

		goto out;

	}

	btrfs_put_root(tmp_root);



	test_msg("running qgroup tests");

	ret = test_no_shared_qgroup(root, sectorsize, nodesize);

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