Introduce new function, verify_parities(), to check if parities matches for full stripe which all data stripes matches with their csum.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com> --- check/scrub.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 59 insertions(+) diff --git a/check/scrub.c b/check/scrub.c index f29effa..d8182d6 100644 --- a/check/scrub.c +++ b/check/scrub.c @@ -408,3 +408,62 @@ out: btrfs_free_path(path); return ret; } + +static int verify_parities(struct btrfs_fs_info *fs_info, + struct btrfs_scrub_progress *scrub_ctx, + struct scrub_full_stripe *fstripe) +{ + void **ptrs; + void *ondisk_p = NULL; + void *ondisk_q = NULL; + void *buf_p; + void *buf_q; + int nr_stripes = fstripe->nr_stripes; + int stripe_len = BTRFS_STRIPE_LEN; + int i; + int ret; + + ptrs = malloc(sizeof(void *) * fstripe->nr_stripes); + buf_p = malloc(fstripe->stripe_len); + buf_q = malloc(fstripe->stripe_len); + if (!ptrs || !buf_p || !buf_q) { + ret = -ENOMEM; + goto out; + } + + for (i = 0; i < fstripe->nr_stripes; i++) { + struct scrub_stripe *stripe = &fstripe->stripes[i]; + + if (stripe->logical == BTRFS_RAID5_P_STRIPE) { + ondisk_p = stripe->data; + ptrs[i] = buf_p; + continue; + } else if (stripe->logical == BTRFS_RAID6_Q_STRIPE) { + ondisk_q = stripe->data; + ptrs[i] = buf_q; + continue; + } else { + ptrs[i] = stripe->data; + continue; + } + } + /* RAID6 */ + if (ondisk_q) { + raid6_gen_syndrome(nr_stripes, stripe_len, ptrs); + if (memcmp(ondisk_q, ptrs[nr_stripes - 1], stripe_len) || + memcmp(ondisk_p, ptrs[nr_stripes - 2], stripe_len)) + ret = -EIO; + } else { + ret = raid5_gen_result(nr_stripes, stripe_len, nr_stripes - 1, + ptrs); + if (ret < 0) + goto out; + if (memcmp(ondisk_p, ptrs[nr_stripes - 1], stripe_len)) + ret = -EIO; + } +out: + free(buf_p); + free(buf_q); + free(ptrs); + return ret; +} -- 2.10.0 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html