btrfs: remove btrfs_clear_extent_bits()

It's just a simple wrapper around btrfs_clear_extent_bit() that passes a
NULL for its last argument (a cached extent state record), plus there is
not counter part - we have a btrfs_set_extent_bit() but we do not have a
btrfs_set_extent_bits() (plural version). So just remove it and make all
callers use btrfs_clear_extent_bit() directly.

Reviewed-by: Qu Wenruo <[e-mail]>
Reviewed-by: Johannes Thumshirn <[e-mail]>
Signed-off-by: Filipe Manana <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/block-group.c

···
 
 static inline void btrfs_free_excluded_extents(const struct btrfs_block_group *bg)
 {
-	btrfs_clear_extent_bits(&bg->fs_info->excluded_extents, bg->start,
-				bg->start + bg->length - 1, EXTENT_DIRTY);
+	btrfs_clear_extent_bit(&bg->fs_info->excluded_extents, bg->start,
+			       bg->start + bg->length - 1, EXTENT_DIRTY, NULL);
 }
 
 static noinline void caching_thread(struct btrfs_work *work)
···
 	 */
 	mutex_lock(&fs_info->unused_bg_unpin_mutex);
 	if (prev_trans) {
-		ret = btrfs_clear_extent_bits(&prev_trans->pinned_extents, start, end,
-					      EXTENT_DIRTY);
+		ret = btrfs_clear_extent_bit(&prev_trans->pinned_extents, start, end,
+					     EXTENT_DIRTY, NULL);
 		if (ret)
 			goto out;
 	}
 
-	ret = btrfs_clear_extent_bits(&trans->transaction->pinned_extents, start, end,
-				      EXTENT_DIRTY);
+	ret = btrfs_clear_extent_bit(&trans->transaction->pinned_extents, start, end,
+				     EXTENT_DIRTY, NULL);
 out:
 	mutex_unlock(&fs_info->unused_bg_unpin_mutex);
 	if (prev_trans)

fs/btrfs/disk-io.c

···
 
 	while (btrfs_find_first_extent_bit(dirty_pages, start, &start, &end,
 					   mark, NULL)) {
-		btrfs_clear_extent_bits(dirty_pages, start, end, mark);
+		btrfs_clear_extent_bit(dirty_pages, start, end, mark, NULL);
 		while (start <= end) {
 			eb = find_extent_buffer(fs_info, start);
 			start += fs_info->nodesize;

fs/btrfs/extent-io-tree.h

···
 						cached, NULL);
 }
 
-static inline int btrfs_clear_extent_bits(struct extent_io_tree *tree, u64 start,
-					  u64 end, u32 bits)
-{
-	return btrfs_clear_extent_bit(tree, start, end, bits, NULL);
-}
-
 int btrfs_set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
 				 u32 bits, struct extent_changeset *changeset);
 int btrfs_set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,

fs/btrfs/inode.c

···
 	    btrfs_test_range_bit(&inode->io_tree, file_offset, end, EXTENT_NODATASUM,
 				 NULL)) {
 		/* Skip the range without csum for data reloc inode */
-		btrfs_clear_extent_bits(&inode->io_tree, file_offset, end,
-					EXTENT_NODATASUM);
+		btrfs_clear_extent_bit(&inode->io_tree, file_offset, end,
+				       EXTENT_NODATASUM, NULL);
 		return true;
 	}
 

fs/btrfs/qgroup.c

···
 		 * Now the entry is in [start, start + len), revert the
 		 * EXTENT_QGROUP_RESERVED bit.
 		 */
-		clear_ret = btrfs_clear_extent_bits(&inode->io_tree, entry_start,
-						    entry_end, EXTENT_QGROUP_RESERVED);
+		clear_ret = btrfs_clear_extent_bit(&inode->io_tree, entry_start, entry_end,
+						   EXTENT_QGROUP_RESERVED, NULL);
 		if (!ret && clear_ret < 0)
 			ret = clear_ret;
 

fs/btrfs/reflink.c

···
 	if (ret < 0)
 		goto out_unlock;
 
-	btrfs_clear_extent_bits(&inode->io_tree, file_offset, range_end,
-				EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG);
+	btrfs_clear_extent_bit(&inode->io_tree, file_offset, range_end,
+			       EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, NULL);
 	ret = btrfs_set_extent_delalloc(inode, file_offset, range_end, 0, NULL);
 	if (ret)
 		goto out_unlock;

fs/btrfs/relocation.c

···
 	}
 
 	btrfs_release_path(path);
-	btrfs_clear_extent_bits(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY);
+	btrfs_clear_extent_bit(&rc->processed_blocks, 0, (u64)-1, EXTENT_DIRTY, NULL);
 
 	if (trans) {
 		btrfs_end_transaction_throttle(trans);

fs/btrfs/tests/extent-io-tests.c

···
 out_bits:
 	if (ret)
 		dump_extent_io_tree(tmp);
-	btrfs_clear_extent_bits(tmp, 0, total_dirty - 1, (unsigned)-1);
+	btrfs_clear_extent_bit(tmp, 0, total_dirty - 1, (unsigned)-1, NULL);
 out:
 	if (locked_page)
 		put_page(locked_page);
···
 out:
 	if (ret)
 		dump_extent_io_tree(&tree);
-	btrfs_clear_extent_bits(&tree, 0, (u64)-1, CHUNK_TRIMMED | CHUNK_ALLOCATED);
+	btrfs_clear_extent_bit(&tree, 0, (u64)-1, CHUNK_TRIMMED | CHUNK_ALLOCATED, NULL);
 
 	return ret;
 }

fs/btrfs/tests/inode-tests.c

···
 	}
 
 	/* [BTRFS_MAX_EXTENT_SIZE/2][sectorsize HOLE][the rest] */
-	ret = btrfs_clear_extent_bits(&BTRFS_I(inode)->io_tree,
-				      BTRFS_MAX_EXTENT_SIZE >> 1,
-				      (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
-				      EXTENT_DELALLOC | EXTENT_DELALLOC_NEW);
+	ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree,
+				     BTRFS_MAX_EXTENT_SIZE >> 1,
+				     (BTRFS_MAX_EXTENT_SIZE >> 1) + sectorsize - 1,
+				     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
 	if (ret) {
 		test_err("clear_extent_bit returned %d", ret);
 		goto out;
···
 	}
 
 	/* [BTRFS_MAX_EXTENT_SIZE+4k][4K HOLE][BTRFS_MAX_EXTENT_SIZE+4k] */
-	ret = btrfs_clear_extent_bits(&BTRFS_I(inode)->io_tree,
-				      BTRFS_MAX_EXTENT_SIZE + sectorsize,
-				      BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
-				      EXTENT_DELALLOC | EXTENT_DELALLOC_NEW);
+	ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree,
+				     BTRFS_MAX_EXTENT_SIZE + sectorsize,
+				     BTRFS_MAX_EXTENT_SIZE + 2 * sectorsize - 1,
+				     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
 	if (ret) {
 		test_err("clear_extent_bit returned %d", ret);
 		goto out;
···
 	}
 
 	/* Empty */
-	ret = btrfs_clear_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
-				      EXTENT_DELALLOC | EXTENT_DELALLOC_NEW);
+	ret = btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
+				     EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
 	if (ret) {
 		test_err("clear_extent_bit returned %d", ret);
 		goto out;
···
 	ret = 0;
 out:
 	if (ret)
-		btrfs_clear_extent_bits(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
-					EXTENT_DELALLOC | EXTENT_DELALLOC_NEW);
+		btrfs_clear_extent_bit(&BTRFS_I(inode)->io_tree, 0, (u64)-1,
+				       EXTENT_DELALLOC | EXTENT_DELALLOC_NEW, NULL);
 	iput(inode);
 	btrfs_free_dummy_root(root);
 	btrfs_free_dummy_fs_info(fs_info);

fs/btrfs/volumes.c

···
 
 	mutex_lock(&fs_info->chunk_mutex);
 	/* Clear all state bits beyond the shrunk device size */
-	btrfs_clear_extent_bits(&device->alloc_state, new_size, (u64)-1,
-				CHUNK_STATE_MASK);
+	btrfs_clear_extent_bit(&device->alloc_state, new_size, (u64)-1,
+			       CHUNK_STATE_MASK, NULL);
 
 	btrfs_device_set_disk_total_bytes(device, new_size);
 	if (list_empty(&device->post_commit_list))
···
 		struct btrfs_io_stripe *stripe = &map->stripes[i];
 		struct btrfs_device *device = stripe->dev;
 
-		btrfs_clear_extent_bits(&device->alloc_state, stripe->physical,
-					stripe->physical + map->stripe_size - 1,
-					bits | EXTENT_NOWAIT);
+		btrfs_clear_extent_bit(&device->alloc_state, stripe->physical,
+				       stripe->physical + map->stripe_size - 1,
+				       bits | EXTENT_NOWAIT, NULL);
 	}
 }