osd: EC: Fix partial reads with LRC plugin

LRC plugin uses a mapping from raw_shard to shard, all other
EC plugins have an identity mapping. Partial reads need to
convert shard back to a raw_shard when calculating how to
trim the buffers that were read.

Signed-off-by: Bill Scales <bill_scales@uk.ibm.com>

diff --git a/src/osd/ECCommon.cc b/src/osd/ECCommon.cc
index 9e981d54b7962a1fed2409413dc2ec9d86e976b8..70e1311eaa2e5e9b4d6c71495ca599152ec05c2d 100644 (file)
--- a/src/osd/ECCommon.cc
+++ b/src/osd/ECCommon.cc
@@ -561,7 +561,8 @@ struct ClientReadCompleter : ECCommon::ReadCompleter {
       uint64_t chunk_size = read_pipeline.sinfo.get_chunk_size();
       uint64_t trim_offset = 0;
       for (auto shard : wanted_to_read) {
-       if (shard * chunk_size < aligned_offset_in_stripe) {
+       if (read_pipeline.sinfo.get_raw_shard(shard) * chunk_size <
+           aligned_offset_in_stripe) {
          trim_offset += chunk_size;
        } else {
          break;