Introduce function, recover_from_parities(), to recover data stripes.
However this function only support RAID5 yet, but should be good enough
for the scrub framework.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
check/scrub.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/check/scrub.c b/check/scrub.c
index d8182d6..c965328 100644
--- a/check/scrub.c
+++ b/check/scrub.c
@@ -58,6 +58,9 @@ struct scrub_full_stripe {
/* Missing stripe index */
int missing_stripes[2];
+ /* Has already been recovered using parities */
+ unsigned int recovered:1;
+
struct scrub_stripe stripes[];
};
@@ -467,3 +470,49 @@ out:
free(ptrs);
return ret;
}
+
+static int recovery_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 corrupted = -1;
+ int stripe_len = BTRFS_STRIPE_LEN;
+ int i;
+ int ret;
+
+ /* No need to recover */
+ if (!fstripe->err_read_stripes && !fstripe->err_csum_dstripes)
+ return 0;
+
+ /* Already recovered once, no more chance */
+ if (fstripe->recovered)
+ return -EINVAL;
+
+ if (fstripe->bg_type == BTRFS_BLOCK_GROUP_RAID6) {
+ /* Need to recover 2 stripes, not supported yet */
+ error("recover data stripes for RAID6 is not support yet");
+ return -ENOTTY;
+ }
+
+ /* Out of repair */
+ if (fstripe->err_read_stripes + fstripe->err_csum_dstripes > 1)
+ return -EINVAL;
+
+ 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;
+ corrupted = fstripe->missing_stripes[0];
+
+ /* Recover the corrupted data csum */
+ ret = raid5_gen_result(nr_stripes, stripe_len, corrupted, ptrs);
+
+ fstripe->recovered = 1;
+ free(ptrs);
+ return ret;
+}
--
2.10.0
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