From cfc8f4c2e70d26c64700b773f752bd8f9ea109ad Mon Sep 17 00:00:00 2001
From: Sage Weil <sage@redhat.com>
Date: Mon, 4 Jan 2016 13:42:06 -0500
Subject: [PATCH] os/bluestore/BlockDevice: read_buffered

Signed-off-by: Sage Weil <sage@redhat.com>
---
 src/os/bluestore/BlockDevice.cc | 24 ++++++++++++++++++++++++
 src/os/bluestore/BlockDevice.h  |  1 +
 2 files changed, 25 insertions(+)

diff --git a/src/os/bluestore/BlockDevice.cc b/src/os/bluestore/BlockDevice.cc
index 1d7656b49ee12..a4975c1450ba9 100644
--- a/src/os/bluestore/BlockDevice.cc
+++ b/src/os/bluestore/BlockDevice.cc
@@ -474,6 +474,30 @@ int BlockDevice::read(uint64_t off, uint64_t len, bufferlist *pbl,
   return r < 0 ? r : 0;
 }
 
+int BlockDevice::read_buffered(uint64_t off, uint64_t len, char *buf)
+{
+  dout(5) << __func__ << " " << off << "~" << len << dendl;
+  assert(len > 0);
+  assert(off < size);
+  assert(off + len <= size);
+
+  int r = ::pread(fd_buffered, buf, len, off);
+  if (r < 0) {
+    r = -errno;
+    goto out;
+  }
+  assert(r == len);
+
+  dout(40) << "data: ";
+  bufferlist bl;
+  bl.append(buf, len);
+  bl.hexdump(*_dout);
+  *_dout << dendl;
+
+ out:
+  return r < 0 ? r : 0;
+}
+
 int BlockDevice::invalidate_cache(uint64_t off, uint64_t len)
 {
   dout(5) << __func__ << " " << off << "~" << len << dendl;
diff --git a/src/os/bluestore/BlockDevice.h b/src/os/bluestore/BlockDevice.h
index 187a7f57fe59e..f5acc1113d954 100644
--- a/src/os/bluestore/BlockDevice.h
+++ b/src/os/bluestore/BlockDevice.h
@@ -97,6 +97,7 @@ public:
   int read(uint64_t off, uint64_t len, bufferlist *pbl,
 	   IOContext *ioc,
 	   bool buffered);
+  int read_buffered(uint64_t off, uint64_t len, char *buf);
 
   int aio_write(uint64_t off, bufferlist& bl,
 		IOContext *ioc,
-- 
2.39.5