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From: NeilBrown <neilb@suse.com>
To: Xiao Ni <xni@redhat.com>
Cc: linux-raid@vger.kernel.org
Subject: [PATCH 0/4] RFC: attempt to remove md deadlocks with metadata without
Date: Tue, 12 Sep 2017 11:49:12 +1000	[thread overview]
Message-ID: <150518076229.32691.13542756562323866921.stgit@noble> (raw)

Hi,
 I looked again at the previous patch I posted which tried to mak
 md_update_sb() safe without taking reconfig_mutex, and realized that
 it had serious problems, particularly around devices being added or
 removed while the update was happening.

 So I decided to try a different approach, which is embodied in these
 patches.  The md thread is now explicitly allowed to call
 md_update_sb() while some other thread holds the lock and
 waits for mddev_suspend() to complete.

 Please test these and confirm that they still address the problem you
 found.

Thanks,
NeilBrown

---

NeilBrown (4):
      md: always hold reconfig_mutex when calling mddev_suspend()
      md: don't call bitmap_create() while array is quiesced.
      md: use mddev_suspend/resume instead of ->quiesce()
      md: allow metadata update while suspending.


 drivers/md/dm-raid.c     |    5 ++++-
 drivers/md/md.c          |   45 ++++++++++++++++++++++++++++++++-------------
 drivers/md/md.h          |    6 ++++++
 drivers/md/raid5-cache.c |    2 ++
 4 files changed, 44 insertions(+), 14 deletions(-)

--
Signature


             reply	other threads:[~2017-09-12  1:49 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-12  1:49 NeilBrown [this message]
2017-09-12  1:49 ` [PATCH 3/4] md: use mddev_suspend/resume instead of ->quiesce() NeilBrown
2017-09-12  1:49 ` [PATCH 1/4] md: always hold reconfig_mutex when calling mddev_suspend() NeilBrown
2017-09-12  1:49 ` [PATCH 4/4] md: allow metadata update while suspending NeilBrown
2017-09-12  1:49 ` [PATCH 2/4] md: don't call bitmap_create() while array is quiesced NeilBrown
2017-09-12  2:51 ` [PATCH 0/4] RFC: attempt to remove md deadlocks with metadata without Xiao Ni
2017-09-13  2:11 ` Xiao Ni
2017-09-13 15:09   ` Xiao Ni
2017-09-13 23:05     ` NeilBrown
2017-09-14  4:55       ` Xiao Ni
2017-09-14  5:32         ` NeilBrown
2017-09-14  7:57           ` Xiao Ni
2017-09-16 13:15             ` Xiao Ni
2017-10-05  5:17             ` NeilBrown
2017-10-06  3:53               ` Xiao Ni
2017-10-06  4:32                 ` NeilBrown
2017-10-09  1:21                   ` Xiao Ni
2017-10-09  4:57                     ` NeilBrown
2017-10-09  5:32                       ` Xiao Ni
2017-10-09  5:52                         ` NeilBrown
2017-10-10  6:05                           ` Xiao Ni
2017-10-10 21:20                             ` NeilBrown
     [not found]                               ` <960568852.19225619.1507689864371.JavaMail.zimbra@redhat.com>
2017-10-13  3:48                                 ` NeilBrown
2017-10-16  4:43                                   ` Xiao Ni
2017-09-30  9:46 ` Xiao Ni
2017-10-05  5:03   ` NeilBrown
2017-10-06  3:40     ` Xiao Ni

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