From 0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0 Mon Sep 17 00:00:00 2001 From: Liu Bo Date: Thu, 16 Feb 2012 18:34:37 +0800 Subject: [PATCH] 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 --- fs/btrfs/extent_io.c | 15 ++++++++++----- 1 file changed, 10 insertions(+), 5 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 8d6f55fbd28e..fe14285b53f1 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -513,6 +513,15 @@ hit_next: WARN_ON(state->end < start); last_end = state->end; + if (state->end < end && !need_resched()) + next_node = rb_next(&state->rb_node); + else + next_node = NULL; + + /* the state doesn't have the wanted bits, go ahead */ + if (!(state->state & bits)) + goto next; + /* * | ---- desired range ---- | * | state | or @@ -565,12 +574,8 @@ hit_next: goto out; } - if (state->end < end && prealloc && !need_resched()) - next_node = rb_next(&state->rb_node); - else - next_node = NULL; - set |= clear_state_bit(tree, state, &bits, wake); +next: if (last_end == (u64)-1) goto out; start = last_end + 1; -- 2.20.1