From: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Introduce function, recover_from_parities(), to recover data stripes.
It just wraps raid56_recov() with extra check functions to
scrub_full_stripe structure.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
Signed-off-by: Gu Jinxiang <gujx@xxxxxxxxxxxxxx>
---
scrub.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/scrub.c b/scrub.c
index 33d5ce2..4d7709f 100644
--- a/scrub.c
+++ b/scrub.c
@@ -823,3 +823,54 @@ out:
free(ptrs);
return ret;
}
+
+/*
+ * Try to recover data stripe from P or Q stripe
+ *
+ * Return >0 if it can't be require any more.
+ * Return 0 for successful repair or no need to repair at all
+ * Return <0 for fatal error
+ */
+static int recover_from_parities(struct btrfs_fs_info *fs_info,
+ struct btrfs_scrub_progress *scrub_ctx,
+ struct scrub_full_stripe *fstripe)
+{
+ void **ptrs;
+ int nr_stripes = fstripe->nr_stripes;
+ int stripe_len = BTRFS_STRIPE_LEN;
+ int max_tolerance;
+ int i;
+ int ret;
+
+ /* No need to recover */
+ if (!fstripe->nr_corrupted_stripes)
+ return 0;
+
+ /* Already recovered once, no more chance */
+ if (fstripe->recovered)
+ return 1;
+
+ if (fstripe->bg_type & BTRFS_BLOCK_GROUP_RAID5)
+ max_tolerance = 1;
+ else
+ max_tolerance = 2;
+
+ /* Out of repair */
+ if (fstripe->nr_corrupted_stripes > max_tolerance)
+ return 1;
+
+ ptrs = malloc(sizeof(void *) * fstripe->nr_stripes);
+ if (!ptrs)
+ return -ENOMEM;
+
+ /* Construct ptrs */
+ for (i = 0; i < nr_stripes; i++)
+ ptrs[i] = fstripe->stripes[i].data;
+
+ ret = raid56_recov(nr_stripes, stripe_len, fstripe->bg_type,
+ fstripe->corrupted_index[0],
+ fstripe->corrupted_index[1], ptrs);
+ fstripe->recovered = 1;
+ free(ptrs);
+ return ret;
+}
--
2.9.4
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