zfs-patches/0014-Emit-an-error-message-before-MMP-suspends-pool.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: "John L. Hammond" <35266395+jhammond-intel@users.noreply.github.com>
   3 Date: Wed, 17 Jan 2018 14:24:42 -0600
   4 Subject: [PATCH] Emit an error message before MMP suspends pool
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 In mmp_thread(), emit an MMP specific error message before calling
  10 zio_suspend() so that the administrator will understand why the pool
  11 is being suspended.
  12
  13 Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
  14 Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
  15 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
  16 Signed-off-by: John L. Hammond <john.hammond@intel.com>
  17 Closes #7048
  18 (cherry picked from commit ecc972c7f009e1fa75900e276a4c1306c55b5722)
  19 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  20 ---
  21  module/zfs/mmp.c | 5 +++++
  22  1 file changed, 5 insertions(+)
  23
  24 diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c
  25 index 6f2aa3f59..e91ae628a 100644
  26 --- a/module/zfs/mmp.c
  27 +++ b/module/zfs/mmp.c
  28 @@ -26,6 +26,7 @@
  29  #include <sys/mmp.h>
  30  #include <sys/spa.h>
  31  #include <sys/spa_impl.h>
  32 +#include <sys/time.h>
  33  #include <sys/vdev.h>
  34  #include <sys/vdev_impl.h>
  35  #include <sys/zfs_context.h>
  36 @@ -428,6 +429,10 @@ mmp_thread(spa_t *spa)
  37                  */
  38                 if (!suspended && mmp_fail_intervals && multihost &&
  39                     (start - mmp->mmp_last_write) > max_fail_ns) {
  40 +                       cmn_err(CE_WARN, "MMP writes to pool '%s' have not "
  41 +                           "succeeded in over %llus; suspending pool",
  42 +                           spa_name(spa),
  43 +                           NSEC2SEC(start - mmp->mmp_last_write));
  44                         zio_suspend(spa, NULL);
  45                 }
  46
  47 --
  48 2.14.2
  49