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Commit eabf290d1470921f0ce5a9b22464ae30646a0677

Authored by Dmitry Monakhov
Committed by Jan Kara
1 parent 4689153237
Exists in master and in 7 other branches imx_3.0.35_4.1.0, imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga, smarc-l5.0.0_1.0.0-ga

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 <dmonakhov@openvz.org>
Signed-off-by: Jan Kara <jack@suse.cz>

Showing 1 changed file with 11 additions and 2 deletions Side-by-side Diff

... ... @@ -317,14 +317,23 @@
317 317 return dquot->dq_sb->dq_op->mark_dirty(dquot);
318 318 }
319 319  
  320 +/* Mark dquot dirty in atomic manner, and return it's old dirty flag state */
320 321 int dquot_mark_dquot_dirty(struct dquot *dquot)
321 322 {
  323 + int ret = 1;
  324 +
  325 + /* If quota is dirty already, we don't have to acquire dq_list_lock */
  326 + if (test_bit(DQ_MOD_B, &dquot->dq_flags))
  327 + return 1;
  328 +
322 329 spin_lock(&dq_list_lock);
323   - if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags))
  330 + if (!test_and_set_bit(DQ_MOD_B, &dquot->dq_flags)) {
324 331 list_add(&dquot->dq_dirty, &sb_dqopt(dquot->dq_sb)->
325 332 info[dquot->dq_type].dqi_dirty_list);
  333 + ret = 0;
  334 + }
326 335 spin_unlock(&dq_list_lock);
327   - return 0;
  336 + return ret;
328 337 }
329 338 EXPORT_SYMBOL(dquot_mark_dquot_dirty);
330 339