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75b07eca FG |
1 | From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 |
2 | From: Olaf Faaland <faaland1@llnl.gov> | |
3 | Date: Thu, 8 Mar 2018 15:21:54 -0800 | |
4 | Subject: [PATCH] Handle zio_resume and mmp => off | |
5 | MIME-Version: 1.0 | |
6 | Content-Type: text/plain; charset=UTF-8 | |
7 | Content-Transfer-Encoding: 8bit | |
8 | ||
9 | When multihost is disabled on a pool, and the pool is resumed via zpool | |
10 | clear, within a single cycle of the mmp thread's loop (e.g. while it's | |
11 | in the cv_timedwait call), both mmp_last_write and mmp_delay should be | |
12 | updated. | |
13 | ||
14 | The original code mistakenly treated the two cases as if they could not | |
15 | occur at the same time. | |
16 | ||
17 | Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> | |
18 | Reviewed-by: Tony Hutter <hutter2@llnl.gov> | |
19 | Signed-off-by: Olaf Faaland <faaland1@llnl.gov> | |
20 | Closes #7286 | |
21 | (cherry picked from commit 267fd7b0f14251026c35d7ceab4fbbe2f06717e6) | |
22 | Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com> | |
23 | --- | |
24 | module/zfs/mmp.c | 14 ++++++++++---- | |
25 | 1 file changed, 10 insertions(+), 4 deletions(-) | |
26 | ||
27 | diff --git a/module/zfs/mmp.c b/module/zfs/mmp.c | |
28 | index 634e48287..15eea41ab 100644 | |
29 | --- a/module/zfs/mmp.c | |
30 | +++ b/module/zfs/mmp.c | |
31 | @@ -409,16 +409,22 @@ mmp_thread(spa_t *spa) | |
32 | } | |
33 | ||
34 | /* | |
35 | - * When MMP goes off => on, or spa goes suspended => | |
36 | - * !suspended, we know no writes occurred recently. We | |
37 | - * update mmp_last_write to give us some time to try. | |
38 | + * MMP off => on, or suspended => !suspended: | |
39 | + * No writes occurred recently. Update mmp_last_write to give | |
40 | + * us some time to try. | |
41 | */ | |
42 | if ((!last_spa_multihost && multihost) || | |
43 | (last_spa_suspended && !suspended)) { | |
44 | mutex_enter(&mmp->mmp_io_lock); | |
45 | mmp->mmp_last_write = gethrtime(); | |
46 | mutex_exit(&mmp->mmp_io_lock); | |
47 | - } else if (last_spa_multihost && !multihost) { | |
48 | + } | |
49 | + | |
50 | + /* | |
51 | + * MMP on => off: | |
52 | + * mmp_delay == 0 tells importing node to skip activity check. | |
53 | + */ | |
54 | + if (last_spa_multihost && !multihost) { | |
55 | mutex_enter(&mmp->mmp_io_lock); | |
56 | mmp->mmp_delay = 0; | |
57 | mutex_exit(&mmp->mmp_io_lock); | |
58 | -- | |
59 | 2.14.2 | |
60 |