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quota: optimize mark_dirty logic

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- 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 <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Dmitry Monakhov 2010-03-27 15:15:38 +03:00 committed by Jan Kara
parent 4689153237
commit eabf290d14
1 changed files with 11 additions and 2 deletions
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13
fs/quota/dquot.c
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@ -317,14 +317,23 @@ static inline int mark_dquot_dirty(struct dquot *dquot)
return dquot->dq_sb->dq_op->mark_dirty(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 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); 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)-> list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
info[dquot->dq_type].dqi_dirty_list); info[dquot->dq_type].dqi_dirty_list);
ret = 0;
}
spin_unlock(&dq_list_lock); spin_unlock(&dq_list_lock);
return 0; return ret;
} }
EXPORT_SYMBOL(dquot_mark_dquot_dirty); EXPORT_SYMBOL(dquot_mark_dquot_dirty);