Commit b3ad2c17 authored by Nikolay Borisov's avatar Nikolay Borisov Committed by David Sterba
Browse files

btrfs: selftests: Add support for dummy devices 



Add basic infrastructure to create and link dummy btrfs_devices. This
will be used in the pending btrfs_rmap_block test which deals with
the block groups.

Calling btrfs_alloc_dummy_device will link the newly created device to
the passed fs_info and the test framework will free them once the test
is finished.

Signed-off-by: default avatarNikolay Borisov <nborisov@suse.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 96a14336

fs/btrfs/tests/btrfs-tests.c

+29 −0
Original line number Diff line number Diff line
@@ -86,6 +86,27 @@ static void btrfs_destroy_test_fs(void) 
	unregister_filesystem(&test_type);

}



struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info)

{

	struct btrfs_device *dev;



	dev = kzalloc(sizeof(*dev), GFP_KERNEL);

	if (!dev)

		return ERR_PTR(-ENOMEM);



	extent_io_tree_init(NULL, &dev->alloc_state, 0, NULL);

	INIT_LIST_HEAD(&dev->dev_list);

	list_add(&dev->dev_list, &fs_info->fs_devices->devices);



	return dev;

}



static void btrfs_free_dummy_device(struct btrfs_device *dev)

{

	extent_io_tree_release(&dev->alloc_state);

	kfree(dev);

}



struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize)

{

	struct btrfs_fs_info *fs_info = kzalloc(sizeof(struct btrfs_fs_info),
@@ -132,12 +153,14 @@ struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize) 
	INIT_LIST_HEAD(&fs_info->dirty_qgroups);

	INIT_LIST_HEAD(&fs_info->dead_roots);

	INIT_LIST_HEAD(&fs_info->tree_mod_seq_list);

	INIT_LIST_HEAD(&fs_info->fs_devices->devices);

	INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC);

	INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC);

	extent_io_tree_init(fs_info, &fs_info->freed_extents[0],

			    IO_TREE_FS_INFO_FREED_EXTENTS0, NULL);

	extent_io_tree_init(fs_info, &fs_info->freed_extents[1],

			    IO_TREE_FS_INFO_FREED_EXTENTS1, NULL);

	extent_map_tree_init(&fs_info->mapping_tree);

	fs_info->pinned_extents = &fs_info->freed_extents[0];

	set_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state);
@@ -150,6 +173,7 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) 
{

	struct radix_tree_iter iter;

	void **slot;

	struct btrfs_device *dev, *tmp;



	if (!fs_info)

		return;
@@ -180,6 +204,11 @@ void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info) 
	}

	spin_unlock(&fs_info->buffer_lock);



	btrfs_mapping_tree_free(&fs_info->mapping_tree);

	list_for_each_entry_safe(dev, tmp, &fs_info->fs_devices->devices,

				 dev_list) {

		btrfs_free_dummy_device(dev);

	}

	btrfs_free_qgroup_config(fs_info);

	btrfs_free_fs_roots(fs_info);

	cleanup_srcu_struct(&fs_info->subvol_srcu);

fs/btrfs/tests/btrfs-tests.h

+1 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info, unsigned long lengt 
void btrfs_free_dummy_block_group(struct btrfs_block_group *cache);

void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans,

			    struct btrfs_fs_info *fs_info);

struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info);

#else

static inline int btrfs_run_sanity_tests(void)

{

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