On 2.02.2018 10:19, Qu Wenruo wrote:
> Before this patch, chunk allocation is split into 2 parts:
>
> 1) Chunk allocation
> Handled by btrfs_alloc_chunk(), which will insert chunk and device
> extent items.
>
> 2) Block group allocation
> Handled by btrfs_make_block_group(), which will insert block group
> item and update space info.
>
> However for chunk allocation, we don't really need to split these
> operations as all btrfs_alloc_chunk() has btrfs_make_block_group()
> followed.
>
> So it's reasonable to merge btrfs_make_block_group() call into
> btrfs_alloc_chunk() to save several lines, and provides the basis for
> later btrfs_alloc_chunk() rework.
>
> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
> ---
> convert/main.c | 4 ----
> extent-tree.c | 10 ++--------
> mkfs/main.c | 19 -------------------
> volumes.c | 10 ++++++----
> 4 files changed, 8 insertions(+), 35 deletions(-)
>
> diff --git a/convert/main.c b/convert/main.c
> index b2444bb2ff21..240d3aa46db9 100644
> --- a/convert/main.c
> +++ b/convert/main.c
> @@ -915,10 +915,6 @@ static int make_convert_data_block_groups(struct btrfs_trans_handle *trans,
> BTRFS_BLOCK_GROUP_DATA, true);
> if (ret < 0)
> break;
> - ret = btrfs_make_block_group(trans, fs_info, 0,
> - BTRFS_BLOCK_GROUP_DATA, cur, len);
> - if (ret < 0)
> - break;
> cur += len;
> }
> }
> diff --git a/extent-tree.c b/extent-tree.c
> index b085ab0352b3..bccd83d1bae6 100644
> --- a/extent-tree.c
> +++ b/extent-tree.c
> @@ -1909,15 +1909,9 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
> space_info->flags, false);
> if (ret == -ENOSPC) {
> space_info->full = 1;
> - return 0;
> + return ret;
> }
> -
> - BUG_ON(ret);
> -
> - ret = btrfs_make_block_group(trans, fs_info, 0, space_info->flags,
> - start, num_bytes);
> - BUG_ON(ret);
> - return 0;
> + return ret;
> }
>
> static int update_block_group(struct btrfs_root *root,
> diff --git a/mkfs/main.c b/mkfs/main.c
> index 358395ca0250..49159ea533b9 100644
> --- a/mkfs/main.c
> +++ b/mkfs/main.c
> @@ -87,12 +87,6 @@ static int create_metadata_block_groups(struct btrfs_root *root, int mixed,
> error("no space to allocate data/metadata chunk");
> goto err;
> }
> - if (ret)
> - return ret;
> - ret = btrfs_make_block_group(trans, fs_info, 0,
> - BTRFS_BLOCK_GROUP_METADATA |
> - BTRFS_BLOCK_GROUP_DATA,
> - chunk_start, chunk_size);
> if (ret)
> return ret;
> allocation->mixed += chunk_size;
> @@ -106,12 +100,7 @@ static int create_metadata_block_groups(struct btrfs_root *root, int mixed,
> }
> if (ret)
> return ret;
> - ret = btrfs_make_block_group(trans, fs_info, 0,
> - BTRFS_BLOCK_GROUP_METADATA,
> - chunk_start, chunk_size);
> allocation->metadata += chunk_size;
> - if (ret)
> - return ret;
> }
>
> root->fs_info->system_allocs = 0;
> @@ -140,12 +129,7 @@ static int create_data_block_groups(struct btrfs_trans_handle *trans,
> }
> if (ret)
> return ret;
> - ret = btrfs_make_block_group(trans, fs_info, 0,
> - BTRFS_BLOCK_GROUP_DATA,
> - chunk_start, chunk_size);
> allocation->data += chunk_size;
> - if (ret)
> - return ret;
> }
>
> err:
> @@ -249,9 +233,6 @@ static int create_one_raid_group(struct btrfs_trans_handle *trans,
> if (ret)
> return ret;
>
> - ret = btrfs_make_block_group(trans, fs_info, 0,
> - type, chunk_start, chunk_size);
> -
> type &= BTRFS_BLOCK_GROUP_TYPE_MASK;
> if (type == BTRFS_BLOCK_GROUP_DATA) {
> allocation->data += chunk_size;
> diff --git a/volumes.c b/volumes.c
> index 9ee4650351c3..a9dc8c939dc5 100644
> --- a/volumes.c
> +++ b/volumes.c
> @@ -837,10 +837,9 @@ error:
> / sizeof(struct btrfs_stripe) + 1)
>
> /*
> - * Alloc a chunk, will insert dev extents, chunk item.
> - * NOTE: This function will not insert block group item nor mark newly
> - * allocated chunk available for later allocation.
> - * Block group item and free space update is handled by btrfs_make_block_group()
> + * Alloc a chunk, will insert dev extents, chunk item, and insert new
> + * block group and update space info (so that extent allocator can use
> + * newly allocated chunk).
> *
> * @start: return value of allocated chunk start bytenr.
> * @num_bytes: return value of allocated chunk size
> @@ -1159,6 +1158,9 @@ alloc_chunk:
> }
>
> kfree(chunk);
> +
Add a comment here, visually separating this step of the process,
similar to your previous patch:
/*
* Create the block group describing the chunk item
*/
or whatever text you deem correct.
> + ret = btrfs_make_block_group(trans, info, 0, type, map->ce.start,
> + map->ce.size);
> return ret;
>
> out_chunk_map:
>
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