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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>
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285190d99f
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0449314a9c
1 changed files with 10 additions and 5 deletions
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@ -513,6 +513,15 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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WARN_ON(state->end < start);
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last_end = state->end;
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if (state->end < end && !need_resched())
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next_node = rb_next(&state->rb_node);
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else
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next_node = NULL;
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/* the state doesn't have the wanted bits, go ahead */
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if (!(state->state & bits))
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goto next;
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/*
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* | ---- desired range ---- |
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* | state | or
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@ -565,12 +574,8 @@ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
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goto out;
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}
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if (state->end < end && prealloc && !need_resched())
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next_node = rb_next(&state->rb_node);
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else
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next_node = NULL;
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set |= clear_state_bit(tree, state, &bits, wake);
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next:
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if (last_end == (u64)-1)
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goto out;
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start = last_end + 1;
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