Re: [PATCH v3 7/9] btrfs: extent-tree: Use btrfs_ref to refactor btrfs_inc_extent_ref()

[Nikolay Borisov <nborisov@suse.com>]

On 11.02.19 г. 7:16 ч., Qu Wenruo wrote:
> Now we don't need to play the dirty game of reusing @owner for tree block
> level.
> 
> Signed-off-by: Qu Wenruo <wqu@suse.com>

Reviewed-by: Nikolay Borisov <nborisov@suse.com>


> ---
>  fs/btrfs/ctree.h       |  5 ++--
>  fs/btrfs/extent-tree.c | 57 ++++++++++++++++++++++++------------------
>  fs/btrfs/file.c        | 17 +++++++++----
>  fs/btrfs/inode.c       | 10 +++++---
>  fs/btrfs/ioctl.c       | 15 ++++++-----
>  fs/btrfs/relocation.c  | 42 ++++++++++++++++++++-----------
>  fs/btrfs/tree-log.c    | 11 +++++---
>  7 files changed, 96 insertions(+), 61 deletions(-)
> 
> diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
> index 9306925b6790..cd90f7cbc8f2 100644
> --- a/fs/btrfs/ctree.h
> +++ b/fs/btrfs/ctree.h
> @@ -41,6 +41,7 @@ extern struct kmem_cache *btrfs_bit_radix_cachep;
>  extern struct kmem_cache *btrfs_path_cachep;
>  extern struct kmem_cache *btrfs_free_space_cachep;
>  struct btrfs_ordered_sum;
> +struct btrfs_ref;
>  
>  #define BTRFS_MAGIC 0x4D5F53665248425FULL /* ascii _BHRfS_M, no null */
>  
> @@ -2755,9 +2756,7 @@ int btrfs_free_and_pin_reserved_extent(struct btrfs_fs_info *fs_info,
>  void btrfs_prepare_extent_commit(struct btrfs_fs_info *fs_info);
>  int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans);
>  int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
> -			 struct btrfs_root *root,
> -			 u64 bytenr, u64 num_bytes, u64 parent,
> -			 u64 root_objectid, u64 owner, u64 offset);
> +			 struct btrfs_ref *generic_ref);
>  
>  int btrfs_start_dirty_block_groups(struct btrfs_trans_handle *trans);
>  int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 5419266d3e5d..d08186ec6410 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -2044,35 +2044,28 @@ int btrfs_discard_extent(struct btrfs_fs_info *fs_info, u64 bytenr,
>  
>  /* Can return -ENOMEM */
>  int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
> -			 struct btrfs_root *root,
> -			 u64 bytenr, u64 num_bytes, u64 parent,
> -			 u64 root_objectid, u64 owner, u64 offset)
> +			 struct btrfs_ref *generic_ref)
>  {
> -	struct btrfs_fs_info *fs_info = root->fs_info;
> -	struct btrfs_ref generic_ref = { 0 };
> +	struct btrfs_fs_info *fs_info = trans->fs_info;
>  	int old_ref_mod, new_ref_mod;
>  	int ret;
>  
> -	BUG_ON(owner < BTRFS_FIRST_FREE_OBJECTID &&
> -	       root_objectid == BTRFS_TREE_LOG_OBJECTID);
> +	ASSERT(generic_ref->type != BTRFS_REF_NOT_SET &&
> +	       generic_ref->action);
> +	BUG_ON(generic_ref->type == BTRFS_REF_METADATA &&
> +	       generic_ref->tree_ref.root == BTRFS_TREE_LOG_OBJECTID);
>  
> -	btrfs_init_generic_ref(&generic_ref, BTRFS_ADD_DELAYED_REF, bytenr,
> -			       num_bytes, parent);
> -	generic_ref.real_root = root->root_key.objectid;
> -	if (owner < BTRFS_FIRST_FREE_OBJECTID) {
> -		btrfs_init_tree_ref(&generic_ref, (int)owner, root_objectid);
> -		ret = btrfs_add_delayed_tree_ref(trans, &generic_ref,
> +	if (generic_ref->type == BTRFS_REF_METADATA)
> +		ret = btrfs_add_delayed_tree_ref(trans, generic_ref,
>  				NULL, &old_ref_mod, &new_ref_mod);
> -	} else {
> -		btrfs_init_data_ref(&generic_ref, root_objectid, owner, offset);
> -		ret = btrfs_add_delayed_data_ref(trans, &generic_ref, 0,
> +	else
> +		ret = btrfs_add_delayed_data_ref(trans, generic_ref, 0,
>  						 &old_ref_mod, &new_ref_mod);
> -	}
>  
> -	btrfs_ref_tree_mod(fs_info, &generic_ref);
> +	btrfs_ref_tree_mod(fs_info, generic_ref);
>  
>  	if (ret == 0 && old_ref_mod < 0 && new_ref_mod >= 0)
> -		add_pinned_bytes(fs_info, &generic_ref);
> +		add_pinned_bytes(fs_info, generic_ref);
>  
>  	return ret;
>  }
> @@ -3246,7 +3239,10 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
>  	u32 nritems;
>  	struct btrfs_key key;
>  	struct btrfs_file_extent_item *fi;
> +	struct btrfs_ref generic_ref = { 0 };
> +	bool for_reloc = btrfs_header_flag(buf, BTRFS_HEADER_FLAG_RELOC);
>  	int i;
> +	int action;
>  	int level;
>  	int ret = 0;
>  
> @@ -3264,6 +3260,10 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
>  		parent = buf->start;
>  	else
>  		parent = 0;
> +	if (inc)
> +		action = BTRFS_ADD_DELAYED_REF;
> +	else
> +		action = BTRFS_DROP_DELAYED_REF;
>  
>  	for (i = 0; i < nritems; i++) {
>  		if (level == 0) {
> @@ -3281,10 +3281,14 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
>  
>  			num_bytes = btrfs_file_extent_disk_num_bytes(buf, fi);
>  			key.offset -= btrfs_file_extent_offset(buf, fi);
> +			btrfs_init_generic_ref(&generic_ref, action, bytenr,
> +					       num_bytes, parent);
> +			generic_ref.real_root = root->root_key.objectid;
> +			btrfs_init_data_ref(&generic_ref, ref_root, key.objectid,
> +					    key.offset);
> +			generic_ref.skip_qgroup = for_reloc;
>  			if (inc)
> -				ret = btrfs_inc_extent_ref(trans, root, bytenr,
> -						num_bytes, parent, ref_root,
> -						key.objectid, key.offset);
> +				ret = btrfs_inc_extent_ref(trans, &generic_ref);
>  			else
>  				ret = btrfs_free_extent(trans, root, bytenr,
>  						num_bytes, parent, ref_root,
> @@ -3294,10 +3298,13 @@ static int __btrfs_mod_ref(struct btrfs_trans_handle *trans,
>  		} else {
>  			bytenr = btrfs_node_blockptr(buf, i);
>  			num_bytes = fs_info->nodesize;
> +			btrfs_init_generic_ref(&generic_ref, action, bytenr,
> +					       num_bytes, parent);
> +			generic_ref.real_root = root->root_key.objectid;
> +			btrfs_init_tree_ref(&generic_ref, level - 1, ref_root);
> +			generic_ref.skip_qgroup = for_reloc;
>  			if (inc)
> -				ret = btrfs_inc_extent_ref(trans, root, bytenr,
> -						num_bytes, parent, ref_root,
> -						level - 1, 0);
> +				ret = btrfs_inc_extent_ref(trans, &generic_ref);
>  			else
>  				ret = btrfs_free_extent(trans, root, bytenr,
>  						num_bytes, parent, ref_root,
> diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
> index 34fe8a58b0e9..2aba5980f522 100644
> --- a/fs/btrfs/file.c
> +++ b/fs/btrfs/file.c
> @@ -754,6 +754,7 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
>  	struct btrfs_fs_info *fs_info = root->fs_info;
>  	struct extent_buffer *leaf;
>  	struct btrfs_file_extent_item *fi;
> +	struct btrfs_ref ref = { 0 };
>  	struct btrfs_key key;
>  	struct btrfs_key new_key;
>  	u64 ino = btrfs_ino(BTRFS_I(inode));
> @@ -909,11 +910,14 @@ int __btrfs_drop_extents(struct btrfs_trans_handle *trans,
>  			btrfs_mark_buffer_dirty(leaf);
>  
>  			if (update_refs && disk_bytenr > 0) {
> -				ret = btrfs_inc_extent_ref(trans, root,
> -						disk_bytenr, num_bytes, 0,
> +				btrfs_init_generic_ref(&ref,
> +						BTRFS_ADD_DELAYED_REF,
> +						disk_bytenr, num_bytes, 0);
> +				btrfs_init_data_ref(&ref,
>  						root->root_key.objectid,
>  						new_key.objectid,
>  						start - extent_offset);
> +				ret = btrfs_inc_extent_ref(trans, &ref);
>  				BUG_ON(ret); /* -ENOMEM */
>  			}
>  			key.offset = start;
> @@ -1142,6 +1146,7 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
>  	struct extent_buffer *leaf;
>  	struct btrfs_path *path;
>  	struct btrfs_file_extent_item *fi;
> +	struct btrfs_ref ref = { 0 };
>  	struct btrfs_key key;
>  	struct btrfs_key new_key;
>  	u64 bytenr;
> @@ -1287,9 +1292,11 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
>  						extent_end - split);
>  		btrfs_mark_buffer_dirty(leaf);
>  
> -		ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes,
> -					   0, root->root_key.objectid,
> -					   ino, orig_offset);
> +		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, bytenr,
> +				       num_bytes, 0);
> +		btrfs_init_data_ref(&ref, root->root_key.objectid, ino,
> +				    orig_offset);
> +		ret = btrfs_inc_extent_ref(trans, &ref);
>  		if (ret) {
>  			btrfs_abort_transaction(trans, ret);
>  			goto out;
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 3f180b857e20..95535ba375f8 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -2531,6 +2531,7 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
>  	struct btrfs_file_extent_item *item;
>  	struct btrfs_ordered_extent *ordered;
>  	struct btrfs_trans_handle *trans;
> +	struct btrfs_ref ref = { 0 };
>  	struct btrfs_root *root;
>  	struct btrfs_key key;
>  	struct extent_buffer *leaf;
> @@ -2701,10 +2702,11 @@ static noinline int relink_extent_backref(struct btrfs_path *path,
>  	inode_add_bytes(inode, len);
>  	btrfs_release_path(path);
>  
> -	ret = btrfs_inc_extent_ref(trans, root, new->bytenr,
> -			new->disk_len, 0,
> -			backref->root_id, backref->inum,
> -			new->file_pos);	/* start - extent_offset */
> +	btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new->bytenr,
> +			       new->disk_len, 0);
> +	btrfs_init_data_ref(&ref, backref->root_id, backref->inum,
> +			    new->file_pos);  /* start - extent_offset */
> +	ret = btrfs_inc_extent_ref(trans, &ref);
>  	if (ret) {
>  		btrfs_abort_transaction(trans, ret);
>  		goto out_free_path;
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 3f9d7be30bf4..f5d49a92f53c 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3755,13 +3755,16 @@ static int btrfs_clone(struct inode *src, struct inode *inode,
>  								datal);
>  
>  				if (disko) {
> +					struct btrfs_ref ref = { 0 };
>  					inode_add_bytes(inode, datal);
> -					ret = btrfs_inc_extent_ref(trans,
> -							root,
> -							disko, diskl, 0,
> -							root->root_key.objectid,
> -							btrfs_ino(BTRFS_I(inode)),
> -							new_key.offset - datao);
> +					btrfs_init_generic_ref(&ref,
> +						BTRFS_ADD_DELAYED_REF, disko,
> +						diskl, 0);
> +					btrfs_init_data_ref(&ref,
> +						root->root_key.objectid,
> +						btrfs_ino(BTRFS_I(inode)),
> +						new_key.offset - datao);
> +					ret = btrfs_inc_extent_ref(trans, &ref);
>  					if (ret) {
>  						btrfs_abort_transaction(trans,
>  									ret);
> diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
> index 70b85a593b7b..b82d532d8e5e 100644
> --- a/fs/btrfs/relocation.c
> +++ b/fs/btrfs/relocation.c
> @@ -1643,6 +1643,8 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
>  
>  	nritems = btrfs_header_nritems(leaf);
>  	for (i = 0; i < nritems; i++) {
> +		struct btrfs_ref ref = { 0 };
> +
>  		cond_resched();
>  		btrfs_item_key_to_cpu(leaf, &key, i);
>  		if (key.type != BTRFS_EXTENT_DATA_KEY)
> @@ -1703,10 +1705,12 @@ int replace_file_extents(struct btrfs_trans_handle *trans,
>  		dirty = 1;
>  
>  		key.offset -= btrfs_file_extent_offset(leaf, fi);
> -		ret = btrfs_inc_extent_ref(trans, root, new_bytenr,
> -					   num_bytes, parent,
> -					   btrfs_header_owner(leaf),
> -					   key.objectid, key.offset);
> +		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
> +				       num_bytes, parent);
> +		ref.real_root = root->root_key.objectid;
> +		btrfs_init_data_ref(&ref, btrfs_header_owner(leaf),
> +				    key.objectid, key.offset);
> +		ret = btrfs_inc_extent_ref(trans, &ref);
>  		if (ret) {
>  			btrfs_abort_transaction(trans, ret);
>  			break;
> @@ -1756,6 +1760,7 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
>  	struct btrfs_fs_info *fs_info = dest->fs_info;
>  	struct extent_buffer *eb;
>  	struct extent_buffer *parent;
> +	struct btrfs_ref ref = { 0 };
>  	struct btrfs_key key;
>  	u64 old_bytenr;
>  	u64 new_bytenr;
> @@ -1914,13 +1919,17 @@ int replace_path(struct btrfs_trans_handle *trans, struct reloc_control *rc,
>  					      path->slots[level], old_ptr_gen);
>  		btrfs_mark_buffer_dirty(path->nodes[level]);
>  
> -		ret = btrfs_inc_extent_ref(trans, src, old_bytenr,
> -					blocksize, path->nodes[level]->start,
> -					src->root_key.objectid, level - 1, 0);
> +		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, old_bytenr,
> +				       blocksize, path->nodes[level]->start);
> +		ref.skip_qgroup = true;
> +		btrfs_init_tree_ref(&ref, level - 1, src->root_key.objectid);
> +		ret = btrfs_inc_extent_ref(trans, &ref);
>  		BUG_ON(ret);
> -		ret = btrfs_inc_extent_ref(trans, dest, new_bytenr,
> -					blocksize, 0, dest->root_key.objectid,
> -					level - 1, 0);
> +		btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF, new_bytenr,
> +				       blocksize, 0);
> +		ref.skip_qgroup = true;
> +		btrfs_init_tree_ref(&ref, level - 1, dest->root_key.objectid);
> +		ret = btrfs_inc_extent_ref(trans, &ref);
>  		BUG_ON(ret);
>  
>  		ret = btrfs_free_extent(trans, src, new_bytenr, blocksize,
> @@ -2719,6 +2728,7 @@ static int do_relocation(struct btrfs_trans_handle *trans,
>  	rc->backref_cache.path[node->level] = node;
>  	list_for_each_entry(edge, &node->upper, list[LOWER]) {
>  		struct btrfs_key first_key;
> +		struct btrfs_ref ref = { 0 };
>  
>  		cond_resched();
>  
> @@ -2816,11 +2826,13 @@ static int do_relocation(struct btrfs_trans_handle *trans,
>  						      trans->transid);
>  			btrfs_mark_buffer_dirty(upper->eb);
>  
> -			ret = btrfs_inc_extent_ref(trans, root,
> -						node->eb->start, blocksize,
> -						upper->eb->start,
> -						btrfs_header_owner(upper->eb),
> -						node->level, 0);
> +			btrfs_init_generic_ref(&ref, BTRFS_ADD_DELAYED_REF,
> +					       node->eb->start, blocksize,
> +					       upper->eb->start);
> +			ref.real_root = root->root_key.objectid;
> +			btrfs_init_tree_ref(&ref, node->level,
> +					    btrfs_header_owner(upper->eb));
> +			ret = btrfs_inc_extent_ref(trans, &ref);
>  			BUG_ON(ret);
>  
>  			ret = btrfs_drop_subtree(trans, root, eb, upper->eb);
> diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
> index 1a69a45ae926..2e62f275ae5b 100644
> --- a/fs/btrfs/tree-log.c
> +++ b/fs/btrfs/tree-log.c
> @@ -693,9 +693,11 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
>  			goto out;
>  
>  		if (ins.objectid > 0) {
> +			struct btrfs_ref ref = { 0 };
>  			u64 csum_start;
>  			u64 csum_end;
>  			LIST_HEAD(ordered_sums);
> +
>  			/*
>  			 * is this extent already allocated in the extent
>  			 * allocation tree?  If so, just add a reference
> @@ -703,10 +705,13 @@ static noinline int replay_one_extent(struct btrfs_trans_handle *trans,
>  			ret = btrfs_lookup_data_extent(fs_info, ins.objectid,
>  						ins.offset);
>  			if (ret == 0) {
> -				ret = btrfs_inc_extent_ref(trans, root,
> -						ins.objectid, ins.offset,
> -						0, root->root_key.objectid,
> +				btrfs_init_generic_ref(&ref,
> +						BTRFS_ADD_DELAYED_REF,
> +						ins.objectid, ins.offset, 0);
> +				btrfs_init_data_ref(&ref,
> +						root->root_key.objectid,
>  						key->objectid, offset);
> +				ret = btrfs_inc_extent_ref(trans, &ref);
>  				if (ret)
>  					goto out;
>  			} else {
>