1 files changed, 70 insertions, 0 deletions
diff --git a/src/librbd/cache/pwl/rwl/ReadRequest.cc b/src/librbd/cache/pwl/rwl/ReadRequest.cc
new file mode 100644
index 000000000..f91f8e5a7
--- /dev/null
+++ b/src/librbd/cache/pwl/rwl/ReadRequest.cc
@@ -0,0 +1,70 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "ReadRequest.h"
+
+#define dout_subsys ceph_subsys_rbd_pwl
+#undef dout_prefix
+#define dout_prefix *_dout << "librbd::cache::pwl::rwl::ReadRequest: " << this << " " \
+                           <<  __func__ << ": "
+
+namespace librbd {
+namespace cache {
+namespace pwl {
+namespace rwl {
+
+void C_ReadRequest::finish(int r) {
+  ldout(m_cct, 20) << "(" << get_name() << "): r=" << r << dendl;
+  int hits = 0;
+  int misses = 0;
+  int hit_bytes = 0;
+  int miss_bytes = 0;
+  if (r >= 0) {
+    /*
+     * At this point the miss read has completed. We'll iterate through
+     * read_extents and produce *m_out_bl by assembling pieces of miss_bl
+     * and the individual hit extent bufs in the read extents that represent
+     * hits.
+     */
+    uint64_t miss_bl_offset = 0;
+    for (auto extent : read_extents) {
+      if (extent->m_bl.length()) {
+        /* This was a hit */
+        ceph_assert(extent->second == extent->m_bl.length());
+        ++hits;
+        hit_bytes += extent->second;
+        m_out_bl->claim_append(extent->m_bl);
+      } else {
+        /* This was a miss. */
+        ++misses;
+        miss_bytes += extent->second;
+        bufferlist miss_extent_bl;
+        miss_extent_bl.substr_of(miss_bl, miss_bl_offset, extent->second);
+        /* Add this read miss bufferlist to the output bufferlist */
+        m_out_bl->claim_append(miss_extent_bl);
+        /* Consume these bytes in the read miss bufferlist */
+        miss_bl_offset += extent->second;
+      }
+    }
+  }
+  ldout(m_cct, 20) << "(" << get_name() << "): r=" << r << " bl=" << *m_out_bl << dendl;
+  utime_t now = ceph_clock_now();
+  ceph_assert((int)m_out_bl->length() == hit_bytes + miss_bytes);
+  m_on_finish->complete(r);
+  m_perfcounter->inc(l_librbd_pwl_rd_bytes, hit_bytes + miss_bytes);
+  m_perfcounter->inc(l_librbd_pwl_rd_hit_bytes, hit_bytes);
+  m_perfcounter->tinc(l_librbd_pwl_rd_latency, now - m_arrived_time);
+  if (!misses) {
+    m_perfcounter->inc(l_librbd_pwl_rd_hit_req, 1);
+    m_perfcounter->tinc(l_librbd_pwl_rd_hit_latency, now - m_arrived_time);
+  } else {
+    if (hits) {
+      m_perfcounter->inc(l_librbd_pwl_rd_part_hit_req, 1);
+    }
+  }
+}
+
+} // namespace rwl
+} // namespace pwl
+} // namespace cache
+} // namespace librbd