quota: Fix rcu annotations of inode dquot pointers

stable inclusion
from stable-v4.19.311
commit 06172dff9a47e76dfce9b60d44ef21131b417803
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/IA8B9H
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=06172dff9a47e76dfce9b60d44ef21131b417803



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[ Upstream commit 179b8c97ebf63429589f5afeba59a181fe70603e ]

Dquot pointers in i_dquot array in the inode are protected by
dquot_srcu. Annotate the array pointers with __rcu, perform the locked
dereferences with srcu_dereference_check() instead of plain reads, and
set the array elements with rcu_assign_pointer().

Fixes: b9ba6f94 ("quota: remove dqptr_sem")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202402061900.rTuYDlo6-lkp@intel.com/


Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Baokun Li <libaokun1@huawei.com>