On 2.05.2018 15:29, Qu Wenruo wrote:
>
>
> On 2018年05月02日 19:52, Nikolay Borisov wrote:
>> Originally commit 2681e00f00fe ("btrfs-progs: check for matchingi
>> free space in cache") added the account_super_bytes function to prevent
>> false negative when running btrfs check. Turns out this function is
>> really copied exclude_super_stripes, excluding the calls to
>> exclude_super_stripes. Later commit e4797df6a9fa ("btrfs-progs: check
>> the free space tree in btrfsck") introduced proper version of
>> exclude_super_stripes. Instead of duplicating the function, just remove
>> account_super_bytes and use exclude_super_stripes instead of the former.
>> This also has the benefit of bringing the userspace code a bit closer
>> to the kernel counterpart.
>>
>> Signed-off-by: Nikolay Borisov <nbori...@suse.com>
>
> Since these two functions are the same, it's completely fine to remove one.
As I mentioned, they are not "comlpetely" the same. The difference is
that exclude_super_stripes will mark the stripes as
EXTENT_UPTODATE in fs_info->pinned_extents via add_excluded_extent.
Dunno if this has any repercussions on functionality. I've run the progs
test suite and didn't observe any regressions. Also looking at the usage
of fs_info->pinned_extents didn't see anything conspicuous.
>
> Reviewed-by: Qu Wenruo <w...@suse.com>
>
> Thanks,
> Qu
>
>> ---
>> extent-tree.c | 52 ++--------------------------------------------------
>> 1 file changed, 2 insertions(+), 50 deletions(-)
>>
>> diff --git a/extent-tree.c b/extent-tree.c
>> index ea205ccf4c30..391f0a784710 100644
>> --- a/extent-tree.c
>> +++ b/extent-tree.c
>> @@ -3164,54 +3164,6 @@ static int find_first_block_group(struct btrfs_root
>> *root,
>> return ret;
>> }
>>
>> -static void account_super_bytes(struct btrfs_fs_info *fs_info,
>> - struct btrfs_block_group_cache *cache)
>> -{
>> - u64 bytenr;
>> - u64 *logical;
>> - int stripe_len;
>> - int i, nr, ret;
>> -
>> - if (cache->key.objectid < BTRFS_SUPER_INFO_OFFSET) {
>> - stripe_len = BTRFS_SUPER_INFO_OFFSET - cache->key.objectid;
>> - cache->bytes_super += stripe_len;
>> - }
>> -
>> - for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
>> - bytenr = btrfs_sb_offset(i);
>> - ret = btrfs_rmap_block(fs_info,
>> - cache->key.objectid, bytenr,
>> - 0, &logical, &nr, &stripe_len);
>> - if (ret)
>> - return;
>> -
>> - while (nr--) {
>> - u64 start, len;
>> -
>> - if (logical[nr] > cache->key.objectid +
>> - cache->key.offset)
>> - continue;
>> -
>> - if (logical[nr] + stripe_len <= cache->key.objectid)
>> - continue;
>> -
>> - start = logical[nr];
>> - if (start < cache->key.objectid) {
>> - start = cache->key.objectid;
>> - len = (logical[nr] + stripe_len) - start;
>> - } else {
>> - len = min_t(u64, stripe_len,
>> - cache->key.objectid +
>> - cache->key.offset - start);
>> - }
>> -
>> - cache->bytes_super += len;
>> - }
>> -
>> - kfree(logical);
>> - }
>> -}
>> -
>> int btrfs_read_block_groups(struct btrfs_root *root)
>> {
>> struct btrfs_path *path;
>> @@ -3287,7 +3239,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
>> if (btrfs_chunk_readonly(info, cache->key.objectid))
>> cache->ro = 1;
>>
>> - account_super_bytes(info, cache);
>> + exclude_super_stripes(root, cache);
>>
>> ret = update_space_info(info, cache->flags, found_key.offset,
>> btrfs_block_group_used(&cache->item),
>> @@ -3331,7 +3283,7 @@ btrfs_add_block_group(struct btrfs_fs_info *fs_info,
>> u64 bytes_used, u64 type,
>> cache->flags = type;
>> btrfs_set_block_group_flags(&cache->item, type);
>>
>> - account_super_bytes(fs_info, cache);
>> + exclude_super_stripes(fs_info->extent_root, cache);
>> ret = update_space_info(fs_info, cache->flags, size, bytes_used,
>> &cache->space_info);
>> BUG_ON(ret);
>>
>
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