os/bluestore/BlueFS: use existing IOContext for _write_super

We need to be careful with IOContext destruction racing with the bdev
io completion thread.

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/os/bluestore/BlueFS.cc b/src/os/bluestore/BlueFS.cc
index aff880416607eb1aacf28f241d0b18b2ac65733a..5afc5d260f7c47b2176251dea0624644c9782801 100644 (file)
--- a/src/os/bluestore/BlueFS.cc
+++ b/src/os/bluestore/BlueFS.cc
@@ -406,10 +406,9 @@ int BlueFS::_write_super()
   assert(bl.length() <= get_super_length());
   bl.append_zero(get_super_length() - bl.length());
 
-  IOContext ioc(NULL);
-  bdev[BDEV_DB]->aio_write(get_super_offset(), bl, &ioc, false);
-  bdev[BDEV_DB]->aio_submit(&ioc);
-  ioc.aio_wait();
+  bdev[BDEV_DB]->aio_write(get_super_offset(), bl, ioc[BDEV_DB], false);
+  bdev[BDEV_DB]->aio_submit(ioc[BDEV_DB]);
+  ioc[BDEV_DB]->aio_wait();
   dout(20) << __func__ << " v " << super.version
            << " crc 0x" << std::hex << crc
            << " offset 0x" << get_super_offset() << std::dec