On 2018年04月03日 13:51, Nikolay Borisov wrote:
>
>
> On 3.04.2018 08:39, Qu Wenruo wrote:
>> For metadata dump (fs restored by btrfs-image), since no data is
>> restored check sum verification will definitely report error.
>>
>> Add such check in check_csums() and prompt for user.
>>
>> Issue: #103
>> Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
>
> Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
>
>> ---
>> check/main.c | 13 ++++++++++++-
>> 1 file changed, 12 insertions(+), 1 deletion(-)
>>
>> diff --git a/check/main.c b/check/main.c
>> index 891a6d797756..15c94543946a 100644
>> --- a/check/main.c
>> +++ b/check/main.c
>> @@ -5601,6 +5601,7 @@ static int check_csums(struct btrfs_root *root)
>> int ret;
>> u64 data_len;
>> unsigned long leaf_offset;
>> + bool verify_csum = !!check_data_csum;
>
> nit: Why don't you convert check_data_csum to bool in this patch.
Next thing to do.
> My
> recent testing in !! usage showed that it's generating quite a number of
> additional instructions.
That's pretty interesting.
Would you please shared some more info about this?
Thanks,
Qu
> Not that it will have big impact in this case
> though.
>
>>
>> root = root->fs_info->csum_root;
>> if (!extent_buffer_uptodate(root->node)) {
>> @@ -5623,6 +5624,16 @@ static int check_csums(struct btrfs_root *root)
>> path.slots[0]--;
>> ret = 0;
>>
>> + /*
>> + * For metadata dump (btrfs-image) all data is wiped so verifying data
>> + * csum is meaningless and will always report csum error.
>> + */
>> + if (check_data_csum && (btrfs_super_flags(root->fs_info->super_copy) &
>> + (BTRFS_SUPER_FLAG_METADUMP | BTRFS_SUPER_FLAG_METADUMP_V2))) {
>> + printf("skip data csum verification for metadata dump\n");
>> + verify_csum = false;
>> + }
>> +
>> while (1) {
>> if (path.slots[0] >= btrfs_header_nritems(path.nodes[0])) {
>> ret = btrfs_next_leaf(root, &path);
>> @@ -5644,7 +5655,7 @@ static int check_csums(struct btrfs_root *root)
>>
>> data_len = (btrfs_item_size_nr(leaf, path.slots[0]) /
>> csum_size) * root->fs_info->sectorsize;
>> - if (!check_data_csum)
>> + if (!verify_csum)
>> goto skip_csum_check;
>> leaf_offset = btrfs_item_ptr_offset(leaf, path.slots[0]);
>> ret = check_extent_csums(root, key.offset, data_len,
>>
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