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| author | Liu Bo <liubo2009@cn.fujitsu.com> | 2012-02-16 18:34:37 +0800 |
|---|---|---|
| committer | David Sterba <dsterba@suse.cz> | 2012-02-16 17:23:17 +0100 |
| commit | 0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0 (patch) | |
| tree | 8c651bb7aad7c0529098c46b2dca9a7f02a282f9 /fs | |
| parent | 285190d99fef696ec8b0041787387f013cb71d67 (diff) | |
| download | lwn-0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0.tar.gz lwn-0449314a9cc5a7fb0bd42e2175a3c46f68f3a2b0.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent_io.c | 15 |
1 files 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; |