Btrfs: remove some unnecessary spin_lock usages

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We use mutex lock to protect all the user change operations.
So when we are calling find_qgroup_rb() to check whether qgroup
exists, we don't have to hold spin_lock.

Besides, when enabling/disabling quota, it must be single thread
when operations come here. spin lock must be firstly used to
clear quota_root when disabling quota, while enabling quota, spin
lock must be used to complete the last assign work.

Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

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Wang Shilong 2013-04-07 10:50:17 +00:00 • committed by Josef Bacik

parent f2f6ed3d54

commit 58400fce5a

1 changed files with 6 additions and 21 deletions

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fs/btrfs/qgroup.c

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