Introduce a new function, scrub_data_mirror(), to check mirror based
data blocks.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
check/scrub.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 67 insertions(+)
diff --git a/check/scrub.c b/check/scrub.c
index ce8d5e5..5cd8bc4 100644
--- a/check/scrub.c
+++ b/check/scrub.c
@@ -157,3 +157,70 @@ out:
return ret;
}
+static int scrub_data_mirror(struct btrfs_fs_info *fs_info,
+ struct btrfs_scrub_progress *scrub_ctx,
+ char *data, u64 start, u64 len, int mirror)
+{
+ u64 cur = 0;
+ u32 csum;
+ u32 sectorsize = fs_info->tree_root->sectorsize;
+ char *buf = NULL;
+ int ret = 0;
+ int err = 0;
+
+ if (!data) {
+ buf = malloc(len);
+ if (!buf)
+ return -ENOMEM;
+ /* Read out as much data as possible to speed up read */
+ while (cur < len) {
+ u64 read_len = len - cur;
+
+ ret = read_extent_data(fs_info->tree_root, buf + cur,
+ start + cur, &read_len, mirror);
+ if (ret < 0) {
+ error("failed to read out data at logical
bytenr %llu mirror %d",
+ start + cur, mirror);
+ scrub_ctx->read_errors++;
+ goto out;
+ }
+ scrub_ctx->data_bytes_scrubbed += read_len;
+ cur += read_len;
+ }
+ } else {
+ buf = data;
+ }
+
+ /* Check csum per-sectorsize */
+ cur = 0;
+ while (cur < len) {
+ u32 data_csum = ~(u32)0;
+
+ ret = btrfs_read_one_data_csum(fs_info, start + cur, &csum);
+ if (ret > 0) {
+ scrub_ctx->csum_discards++;
+ /* In case some csum are missing */
+ goto next;
+ }
+ data_csum = btrfs_csum_data(NULL, buf + cur, data_csum,
+ sectorsize);
+ btrfs_csum_final(data_csum, (u8 *)&data_csum);
+ if (data_csum != csum) {
+ error("data at bytenr %llu mirror %d csum mismatch,
have %u expect %u",
+ start + cur, mirror, data_csum, csum);
+ err = 1;
+ scrub_ctx->csum_errors++;
+ cur += sectorsize;
+ continue;
+ }
+ scrub_ctx->data_bytes_scrubbed += sectorsize;
+next:
+ cur += sectorsize;
+ }
+out:
+ if (!data)
+ free(buf);
+ if (!ret && err)
+ return -EIO;
+ return ret;
+}
--
2.10.0
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