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authorLiu Bo <liubo2009@cn.fujitsu.com>2012-02-16 05:34:37 -0500
committerDavid Sterba <dsterba@suse.cz>2012-02-16 11:23:17 -0500
commit0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0 (patch)
tree8c651bb7aad7c0529098c46b2dca9a7f02a282f9
parent285190d99fef696ec8b0041787387f013cb71d67 (diff)
Btrfs: skip states when they does not contain bits to clear
Clearing a range's bits is different with setting them, since we don't need to touch them when states do not contain bits we want. Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
-rw-r--r--fs/btrfs/extent_io.c15
1 files changed, 10 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 8d6f55fbd28..fe14285b53f 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -513,6 +513,15 @@ hit_next:
513 WARN_ON(state->end < start); 513 WARN_ON(state->end < start);
514 last_end = state->end; 514 last_end = state->end;
515 515
516 if (state->end < end && !need_resched())
517 next_node = rb_next(&state->rb_node);
518 else
519 next_node = NULL;
520
521 /* the state doesn't have the wanted bits, go ahead */
522 if (!(state->state & bits))
523 goto next;
524
516 /* 525 /*
517 * | ---- desired range ---- | 526 * | ---- desired range ---- |
518 * | state | or 527 * | state | or
@@ -565,12 +574,8 @@ hit_next:
565 goto out; 574 goto out;
566 } 575 }
567 576
568 if (state->end < end && prealloc && !need_resched())
569 next_node = rb_next(&state->rb_node);
570 else
571 next_node = NULL;
572
573 set |= clear_state_bit(tree, state, &bits, wake); 577 set |= clear_state_bit(tree, state, &bits, wake);
578next:
574 if (last_end == (u64)-1) 579 if (last_end == (u64)-1)
575 goto out; 580 goto out;
576 start = last_end + 1; 581 start = last_end + 1;