linux/fs/notify
Winston Wen 0045fb1bab fanotify: allow freeze when waiting response for permission events
This is a long-standing issue that uninterruptible sleep in fanotify
could make system hibernation fail if the usperspace server gets frozen
before the process waiting for the response (as reported e.g. [1][2]).

A few years ago, there was an attempt to switch to interruptible sleep
while waiting [3], but that would lead to EINTR returns from open(2)
and break userspace [4], so it's been changed to only killable [5].

And the core freezer logic had been rewritten [6][7] in v6.1, allowing
freezing in uninterrupted sleep, so we can solve this problem now.

[1] https://lore.kernel.org/lkml/1518774280-38090-1-git-send-email-t.vivek@samsung.com/
[2] https://lore.kernel.org/lkml/c1bb16b7-9eee-9cea-2c96-a512d8b3b9c7@nwra.com/
[3] https://lore.kernel.org/linux-fsdevel/20190213145443.26836-1-jack@suse.cz/
[4] https://lore.kernel.org/linux-fsdevel/d0031e3a-f050-0832-fa59-928a80ffd44b@nwra.com/
[5] https://lore.kernel.org/linux-fsdevel/20190221105558.GA20921@quack2.suse.cz/
[6] https://lore.kernel.org/lkml/20220822114649.055452969@infradead.org/
[7] https://lore.kernel.org/lkml/20230908-avoid-spurious-freezer-wakeups-v4-0-6155aa3dafae@quicinc.com/

Signed-off-by: Winston Wen <wentao@uniontech.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Message-Id: <BD33543C483B89AB+20240305061804.1186796-1-wentao@uniontech.com>
2024-03-07 12:59:51 +01:00
..
dnotify fs: Remove the now superfluous sentinel elements from ctl_table array 2023-12-28 04:57:57 -08:00
fanotify fanotify: allow freeze when waiting response for permission events 2024-03-07 12:59:51 +01:00
inotify fs: Remove the now superfluous sentinel elements from ctl_table array 2023-12-28 04:57:57 -08:00
fdinfo.c exportfs: add explicit flag to request non-decodeable file handles 2023-05-22 18:08:37 +02:00
fdinfo.h
fsnotify.c fsnotify: optimize the case of no parent watcher 2024-01-24 16:26:03 +01:00
fsnotify.h fsnotify: remove unused declaration 2022-09-09 11:40:03 +02:00
group.c fsnotify: create helpers for group mark_mutex lock 2022-04-25 14:37:22 +02:00
Kconfig fs/notify: Remove "select SRCU" 2023-02-02 16:26:06 -08:00
Makefile
mark.c fanotify: store fsid in mark instead of in connector 2023-12-01 10:55:21 +01:00
notification.c fsnotify: Pass group argument to free_event 2021-10-27 12:34:18 +02:00