ceph/src/pmdk/src/libpmem2/persist_posix.c

   1 // SPDX-License-Identifier: BSD-3-Clause
   2 /* Copyright 2019-2020, Intel Corporation */
   3
   4 /*
   5  * persist_posix.c -- POSIX-specific part of persist implementation
   6  */
   7
   8 #include <errno.h>
   9 #include <stdint.h>
  10 #include <sys/mman.h>
  11
  12 #include "out.h"
  13 #include "persist.h"
  14 #include "pmem2_utils.h"
  15 #include "valgrind_internal.h"
  16
  17 /*
  18  * pmem2_flush_file_buffers_os -- flush CPU and OS file caches for the given
  19  * range
  20  */
  21 int
  22 pmem2_flush_file_buffers_os(struct pmem2_map *map, const void *addr, size_t len,
  23                 int autorestart)
  24 {
  25         /*
  26          * msync accepts addresses aligned to the page boundary, so we may sync
  27          * more and part of it may have been marked as undefined/inaccessible.
  28          * Msyncing such memory is not a bug, so as a workaround temporarily
  29          * disable error reporting.
  30          */
  31         VALGRIND_DO_DISABLE_ERROR_REPORTING;
  32         int ret;
  33         do {
  34                 ret = msync((void *)addr, len, MS_SYNC);
  35
  36                 if (ret < 0) {
  37                         ERR("!msync");
  38                 } else {
  39                         /* full flush */
  40                         VALGRIND_DO_PERSIST((uintptr_t)addr, len);
  41                 }
  42         } while (autorestart && ret < 0 && errno == EINTR);
  43
  44         VALGRIND_DO_ENABLE_ERROR_REPORTING;
  45
  46         if (ret)
  47                 return PMEM2_E_ERRNO;
  48
  49         return 0;
  50 }