Hi Linus,
Could you pull these fixes from Hou Tao please? There are two problems
fixed in fscache volume handling:
(1) wake_up_bit() is incorrectly paired with wait_var_event(). The latter
selects the waitqueue to use differently.
(2) Missing barriers ordering between state bit and task state.
Thanks,
David
To quote Hou Tao:
The patchset includes two fixes for fscache volume operations: patch 1
fixes the hang problem during volume acquisition when the volume
acquisition process waits for the freeing of relinquished volume, patch
2 adds the missing memory barrier in fscache_create_volume_work() and it
is spotted through code review when checking whether or not these is
missing smp_mb() before invoking wake_up_bit().
Change Log:
v3:
* Use clear_and_wake_up_bit() helper (Suggested by Jingbo Xu)
* Tidy up commit message and add Reviewed-by tag
v2: https://listman.redhat.com/archives/linux-cachefs/2022-December/007402.html
* rebased on v6.1-rc1
* Patch 1: use wait_on_bit() instead (Suggested by David)
* Patch 2: add the missing smp_mb() in fscache_create_volume_work()
v1: https://listman.redhat.com/archives/linux-cachefs/2022-December/007384.html
Link: https://lore.kernel.org/r/20230113115211.2895845-1-houtao@xxxxxxxxxxxxxxx
---
The following changes since commit 6d796c50f84ca79f1722bb131799e5a5710c4700:
Linux 6.2-rc6 (2023-01-29 13:59:43 -0800)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git tags/fscache-fixes-20230130
for you to fetch changes up to 3288666c72568fe1cc7f5c5ae33dfd3ab18004c8:
fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work() (2023-01-30 12:51:54 +0000)
----------------------------------------------------------------
fscache fixes
----------------------------------------------------------------
Hou Tao (2):
fscache: Use wait_on_bit() to wait for the freeing of relinquished volume
fscache: Use clear_and_wake_up_bit() in fscache_create_volume_work()
fs/fscache/volume.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
