minor nitpicks in the comment
On Wed, May 17, 2017 at 11:07 AM, Nikolay Borisov <nbori...@suse.com> wrote:
> Following the factoring out of the creation code udpate_space_info can only
" code, update_space_info "
> be called for already-existing space_info structs.
", which always succeeds"?
> Remove superfulous error
> handling and use the return value to return a pointer to the found space_info.
>
> Signed-off-by: Nikolay Borisov <nbori...@suse.com>
> Reviewed-by: Jeff Mahoney <je...@suse.com>
> ---
> fs/btrfs/extent-tree.c | 68
> ++++++++++++++++++--------------------------------
> 1 file changed, 24 insertions(+), 44 deletions(-)
>
> Change since v1
> - Incorporated Jeff Mahoney's feedback and added his reviewed-by tag
>
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 28848e45b018..3d5bf0b7f719 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -3959,10 +3959,10 @@ static int create_space_info(struct btrfs_fs_info
> *info, u64 flags,
> return ret;
> }
>
> -static int update_space_info(struct btrfs_fs_info *info, u64 flags,
> - u64 total_bytes, u64 bytes_used,
> - u64 bytes_readonly,
> - struct btrfs_space_info **space_info)
> +static struct btrfs_space_info *update_space_info(struct btrfs_fs_info *info,
> +
> u64 flags, u64 total_bytes,
> +
> u64 bytes_used,
> +
> u64 bytes_readonly)
> {
> struct btrfs_space_info *found;
> int factor;
> @@ -3974,21 +3974,21 @@ static int update_space_info(struct btrfs_fs_info
> *info, u64 flags,
> factor = 1;
>
> found = __find_space_info(info, flags);
> - if (found) {
> - spin_lock(&found->lock);
> - found->total_bytes += total_bytes;
> - found->disk_total += total_bytes * factor;
> - found->bytes_used += bytes_used;
> - found->disk_used += bytes_used * factor;
> - found->bytes_readonly += bytes_readonly;
> - if (total_bytes > 0)
> - found->full = 0;
> - space_info_add_new_bytes(info, found, total_bytes -
> - bytes_used - bytes_readonly);
> - spin_unlock(&found->lock);
> - *space_info = found;
> - return 0;
> - }
> + BUG_ON(!found);
> +
> + spin_lock(&found->lock);
> + found->total_bytes += total_bytes;
> + found->disk_total += total_bytes * factor;
> + found->bytes_used += bytes_used;
> + found->disk_used += bytes_used * factor;
> + found->bytes_readonly += bytes_readonly;
> + if (total_bytes > 0)
> + found->full = 0;
> + space_info_add_new_bytes(info, found, total_bytes -
> + bytes_used - bytes_readonly);
> + spin_unlock(&found->lock);
> +
> + return found;
> }
>
> static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
> @@ -10042,19 +10042,9 @@ int btrfs_read_block_groups(struct btrfs_fs_info
> *info)
> }
>
> trace_btrfs_add_block_group(info, cache, 0);
> - ret = update_space_info(info, cache->flags, found_key.offset,
> - btrfs_block_group_used(&cache->item),
> - cache->bytes_super, &space_info);
> - if (ret) {
> - btrfs_remove_free_space_cache(cache);
> - spin_lock(&info->block_group_cache_lock);
> - rb_erase(&cache->cache_node,
> - &info->block_group_cache_tree);
> - RB_CLEAR_NODE(&cache->cache_node);
> - spin_unlock(&info->block_group_cache_lock);
> - btrfs_put_block_group(cache);
> - goto error;
> - }
> + space_info = update_space_info(info, cache->flags,
> found_key.offset,
> +
> btrfs_block_group_used(&cache->item),
> +
> cache->bytes_super);
>
> cache->space_info = space_info;
>
> @@ -10212,18 +10202,8 @@ int btrfs_make_block_group(struct btrfs_trans_handle
> *trans,
> * the rbtree, update the space info's counters.
> */
> trace_btrfs_add_block_group(fs_info, cache, 1);
> - ret = update_space_info(fs_info, cache->flags, size, bytes_used,
> - cache->bytes_super, &cache->space_info);
> - if (ret) {
> - btrfs_remove_free_space_cache(cache);
> - spin_lock(&fs_info->block_group_cache_lock);
> - rb_erase(&cache->cache_node,
> - &fs_info->block_group_cache_tree);
> - RB_CLEAR_NODE(&cache->cache_node);
> - spin_unlock(&fs_info->block_group_cache_lock);
> - btrfs_put_block_group(cache);
> - return ret;
> - }
> + cache->space_info = update_space_info(fs_info, cache->flags, size,
> +
> bytes_used, cache->bytes_super);
> update_global_block_rsv(fs_info);
>
> __link_block_group(cache->space_info, cache);
> --
> 2.7.4
>
> --
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