Jan Kara 2a1ddddba6 quota: Fix slow quotaoff ... commit 869b6ea160 upstream. Eric has reported that commit dabc8b2075 ("quota: fix dqput() to follow the guarantees dquot_srcu should provide") heavily increases runtime of generic/270 xfstest for ext4 in nojournal mode. The reason for this is that ext4 in nojournal mode leaves dquots dirty until the last dqput() and thus the cleanup done in quota_release_workfn() has to write them all. Due to the way quota_release_workfn() is written this results in synchronize_srcu() call for each dirty dquot which makes the dquot cleanup when turning quotas off extremely slow. To be able to avoid synchronize_srcu() for each dirty dquot we need to rework how we track dquots to be cleaned up. Instead of keeping the last dquot reference while it is on releasing_dquots list, we drop it right away and mark the dquot with new DQ_RELEASING_B bit instead. This way we can we can remove dquot from releasing_dquots list when new reference to it is acquired and thus there's no need to call synchronize_srcu() each time we drop dq_list_lock. References: https://lore.kernel.org/all/ZRytn6CxFK2oECUt@debian-BULLSEYE-live-builder-AMD64 Reported-by: Eric Whitney <enwlinux@gmail.com> Fixes: dabc8b2075 ("quota: fix dqput() to follow the guarantees dquot_srcu should provide") CC: stable@vger.kernel.org Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-10-19 23:10:56 +02:00
..
compat.h	quota: simplify the quotactl compat handling	2020-09-17 13:00:46 -04:00
dquot.c	quota: Fix slow quotaoff	2023-10-19 23:10:56 +02:00
Kconfig	quota: mark PRINT_QUOTA_WARNING as BROKEN	2023-04-14 13:06:50 +02:00
kqid.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Makefile	quota: simplify the quotactl compat handling	2020-09-17 13:00:46 -04:00
netlink.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
quota_tree.c	quota: Add more checking after reading from quota file	2022-09-29 15:37:30 +02:00
quota_tree.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
quota_v1.c	quota: fixup *_write_file_info() to return proper error code	2023-03-20 17:27:42 +01:00
quota_v2.c	quota: fixup *_write_file_info() to return proper error code	2023-03-20 17:27:42 +01:00
quota.c	fs: Drop wait_unfrozen wait queue	2023-05-30 15:36:40 +02:00
quotaio_v1.h	quota: avoid time_t in v1_disk_dqblk definition	2019-12-16 14:15:30 +01:00
quotaio_v2.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00