[PATCH v3 0/5] quota: fix race condition between dqput() and dquot_mark_dquot_dirty()

[Baokun Li <libaokun1@huawei.com>]

Hello Honza,

This is a solution that uses dquot_srcu to avoid race condition between
dqput() and dquot_mark_dquot_dirty(). I performed a 12+h fault injection
stress test (6 VMs, 4 test threads per VM) and have not found any problems.
And I tested the performance based on the next branch (5c875096d590), this
patch set didn't degrade performance, but rather had a ~5% improvement.

V1->V2:
	Modify the solution to use dquot_srcu.
V2->V3:
	Merge some patches, optimize descriptions.
	Simplify solutions, and fix some spelling errors.

Baokun Li (5):
  quota: factor out dquot_write_dquot()
  quota: rename dquot_active() to inode_quota_active()
  quota: add new helper dquot_active()
  quota: fix dqput() to follow the guarantees dquot_srcu should provide
  quota: simplify drop_dquot_ref()

 fs/quota/dquot.c | 244 ++++++++++++++++++++++++-----------------------
 1 file changed, 125 insertions(+), 119 deletions(-)

-- 
2.31.1