From eabf290d1470921f0ce5a9b22464ae30646a0677 Mon Sep 17 00:00:00 2001 From: Dmitry Monakhov Date: Sat, 27 Mar 2010 15:15:38 +0300 Subject: quota: optimize mark_dirty logic - Skip locking if quota is dirty already. - Return old quota state to help fs-specciffic implementation to optimize case where quota was dirty already. Signed-off-by: Dmitry Monakhov Signed-off-by: Jan Kara --- fs/quota/dquot.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c index 788b5802a7ce..05c590e10ac2 100644 --- a/fs/quota/dquot.c +++ b/fs/quota/dquot.c @@ -317,14 +317,23 @@ static inline int mark_dquot_dirty(struct dquot *dquot) return dquot->dq_sb->dq_op->mark_dirty(dquot); } +/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */ int dquot_mark_dquot_dirty(struct dquot *dquot) { + int ret = 1; + + /* If quota is dirty already, we don't have to acquire dq_list_lock */ + if (test_bit(DQ_MOD_B, &dquot->dq_flags)) + return 1; + spin_lock(&dq_list_lock); - if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) + if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) { list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)-> info[dquot->dq_type].dqi_dirty_list); + ret = 0; + } spin_unlock(&dq_list_lock); - return 0; + return ret; } EXPORT_SYMBOL(dquot_mark_dquot_dirty); -- cgit v1.2.3