From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 13:54:28 +0200
Subject: Adding upstream version 18.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/librbd/cache/pwl/ssd/ReadRequest.cc | 92 +++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/librbd/cache/pwl/ssd/ReadRequest.cc

(limited to 'src/librbd/cache/pwl/ssd/ReadRequest.cc')

diff --git a/src/librbd/cache/pwl/ssd/ReadRequest.cc b/src/librbd/cache/pwl/ssd/ReadRequest.cc
new file mode 100644
index 000000000..1a80a8d8c
--- /dev/null
+++ b/src/librbd/cache/pwl/ssd/ReadRequest.cc
@@ -0,0 +1,92 @@
+// -*- 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::ssd::ReadRequest: " << this << " " \
+                           <<  __func__ << ": "
+
+namespace librbd {
+namespace cache {
+namespace pwl {
+namespace ssd {
+
+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
+       * m_read_extents and produce *m_out_bl by assembling pieces of m_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 */
+        bufferlist data_bl;
+        if (extent->writesame) {
+          int data_len = extent->m_bl.length();
+          int read_buffer_offset = extent->truncate_offset;
+          if (extent->need_to_truncate && extent->truncate_offset >= data_len) {
+            read_buffer_offset = (extent->truncate_offset) % data_len;
+          }
+          // build data and truncate
+          bufferlist temp_bl;
+          uint64_t total_left_bytes = read_buffer_offset + extent->second;
+          while (total_left_bytes > 0) {
+            temp_bl.append(extent->m_bl);
+            total_left_bytes = total_left_bytes - data_len;
+          }
+          data_bl.substr_of(temp_bl, read_buffer_offset, extent->second);
+          m_out_bl->claim_append(data_bl);
+        } else if (extent->need_to_truncate) {
+          assert(extent->m_bl.length() >= extent->truncate_offset + extent->second);
+          data_bl.substr_of(extent->m_bl, extent->truncate_offset, extent->second);
+          m_out_bl->claim_append(data_bl);
+        } else {
+          assert(extent->second == extent->m_bl.length());
+          m_out_bl->claim_append(extent->m_bl);
+        }
+        ++hits;
+        hit_bytes += extent->second;
+      } 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 ssd
+} // namespace pwl
+} // namespace cache
+} // namespace librbd
-- 
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