zfs-patches/0039-Do-not-initiate-MMP-writes-while-pool-is-suspended.patch

   1 From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
   2 From: Olaf Faaland <faaland1@llnl.gov>
   3 Date: Thu, 22 Feb 2018 09:14:46 -0800
   4 Subject: [PATCH] Do not initiate MMP writes while pool is suspended
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 While the pool is suspended on host A, it may be imported on host B.
  10 If host A continued to write MMP blocks, it would be blindly
  11 overwriting MMP blocks written by host B, and the blocks written by
  12 host A would have outdated txg information.
  13
  14 Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
  15 Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
  16 Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
  17 Closes #7182
  18 (cherry picked from commit b1f61f05b4b2edc77ec5f3d28d041d7b3c873f01)
  19 Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
  20 ---
  21  module/zfs/mmp.c | 2 +-
  22  1 file changed, 1 insertion(+), 1 deletion(-)
  23
  24 diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c
  25 index 1dfb7c05b..d003d79de 100644
  26 --- a/module/zfs/mmp.c
  27 +++ b/module/zfs/mmp.c
  28 @@ -437,7 +437,7 @@ mmp_thread(spa_t *spa)
  29                         zio_suspend(spa, NULL);
  30                 }
  31
  32 -               if (multihost)
  33 +               if (multihost && !suspended)
  34                         mmp_write_uberblock(spa);
  35
  36                 CALLB_CPR_SAFE_BEGIN(&cpr);
  37 --
  38 2.14.2
  39