[PATCH -next v6 0/5] md: protect md_thread with rcu

From: Yu Kuai
Date: Thu Apr 13 2023 - 07:33:30 EST


From: Yu Kuai <yukuai3@xxxxxxxxxx>

Changes in v6:
- remove first patch from v5, and use rcu_asign_pointer() directly from
caller.
- always use rcu_read_lock/unlock to protect mddev_set_timeout().

Changes in v5:
- use rcu_dereference_protected() instead of rcu_access_pointer() where
rcu_read_lock/unlock is not required.
- add patch 4,5 to handle that bitmap timeout is set multiple times.

Changes in v4:
- remove patch 2 from v3
- fix sparse errors and warnings from v3, in order to do that, all access
to md_thread need to be modified, patch 2-4 is splited to avoid a huge
patch.

Changes in v3:
- remove patch 3 from v2
- use rcu instead of a new lock

Changes in v2:
- fix a compile error for md-cluster in patch 2
- replace spin_lock/unlock with spin_lock/unlock_irq in patch 5
- don't wake up inside the new lock in md wakeup_thread in patch 5

Yu Kuai (5):
md: factor out a helper to wake up md_thread directly
dm-raid: remove useless checking in raid_message()
md/bitmap: always wake up md_thread in timeout_store
md/bitmap: factor out a helper to set timeout
md: protect md_thread with rcu

drivers/md/dm-raid.c | 4 +-
drivers/md/md-bitmap.c | 43 +++++++++++--------
drivers/md/md-cluster.c | 7 ++--
drivers/md/md-multipath.c | 4 +-
drivers/md/md.c | 88 +++++++++++++++++++++------------------
drivers/md/md.h | 8 ++--
drivers/md/raid1.c | 7 ++--
drivers/md/raid1.h | 2 +-
drivers/md/raid10.c | 21 ++++++----
drivers/md/raid10.h | 2 +-
drivers/md/raid5-cache.c | 22 ++++++----
drivers/md/raid5.c | 15 +++----
drivers/md/raid5.h | 2 +-
13 files changed, 126 insertions(+), 99 deletions(-)

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2.39.2