Amir Goldstein aabb45fdcb dnotify: use fsnotify group lock helpers ... Before commit 9542e6a643 ("nfsd: Containerise filecache laundrette") nfsd would close open files in direct reclaim context. There is no guarantee that others memory shrinkers don't do the same and no guarantee that future shrinkers won't do that. For example, if overlayfs implements inode cache of fscache would keep open files to cached objects, inode shrinkers could end up closing open files to underlying fs. Direct reclaim from dnotify mark allocation context may try to close open files that have dnotify marks of the same group and hit a deadlock on mark_mutex. Set the FSNOTIFY_GROUP_NOFS flag to prevent going into direct reclaim from allocations under dnotify group lock and use the safe group lock helpers. Link: https://lore.kernel.org/r/20220422120327.3459282-11-amir73il@gmail.com Suggested-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20220321112310.vpr7oxro2xkz5llh@quack3.lan/ Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>		2022-04-25 14:37:34 +02:00
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dnotify	dnotify: use fsnotify group lock helpers	2022-04-25 14:37:34 +02:00
fanotify	fsnotify: pass flags argument to fsnotify_alloc_group()	2022-04-25 14:37:12 +02:00
inotify	inotify: use fsnotify group lock helpers	2022-04-25 14:37:24 +02:00
fdinfo.c	fsnotify: create helpers for group mark_mutex lock	2022-04-25 14:37:22 +02:00
fdinfo.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
fsnotify.c	inotify: move control flags from mask to mark flags	2022-04-25 14:37:06 +02:00
fsnotify.h	fsnotify: count all objects with attached connectors	2021-08-11 13:50:48 +02:00
group.c	fsnotify: create helpers for group mark_mutex lock	2022-04-25 14:37:22 +02:00
Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
mark.c	fsnotify: create helpers for group mark_mutex lock	2022-04-25 14:37:22 +02:00
notification.c	fsnotify: Pass group argument to free_event	2021-10-27 12:34:18 +02:00