Introduce new function, verify_parities(), to check if parities matches
for full stripe which all data stripes matches with their csum.
Caller should fill the scrub_full_stripe structure properly before
calling this function.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
scrub.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/scrub.c b/scrub.c
index 1944f216..ef391ad1 100644
--- a/scrub.c
+++ b/scrub.c
@@ -26,6 +26,7 @@
#include "disk-io.h"
#include "utils.h"
#include "kernel-lib/bitops.h"
+#include "kernel-lib/raid56.h"
/*
* For parity based profile(RAID56)
@@ -756,3 +757,71 @@ out:
btrfs_free_path(path);
return ret;
}
+
+/*
+ * Verify parities for RAID56
+ * Caller must fill @fstripe before calling this function
+ *
+ * Return 0 for parities matches.
+ * Return >0 for P or Q mismatch
+ * Return <0 for fatal error
+ */
+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 = 0;
+
+ 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) != 0 ||
+ memcmp(ondisk_p, ptrs[nr_stripes - 2], stripe_len))
+ ret = 1;
+ } 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) != 0)
+ ret = 1;
+ }
+out:
+ free(buf_p);
+ free(buf_q);
+ free(ptrs);
+ return ret;
+}
--
2.13.0
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