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Btrfs: try to avoid acquiring free space ctl's lock
We don't need to take the lock if the block group has not been cached. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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1 changed files with 13 additions and 11 deletions
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@ -7714,18 +7714,20 @@ static noinline int find_free_extent(struct btrfs_root *orig_root,
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last_ptr->fragmented = 1;
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spin_unlock(&last_ptr->lock);
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}
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spin_lock(&block_group->free_space_ctl->tree_lock);
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if (cached &&
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block_group->free_space_ctl->free_space <
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num_bytes + empty_cluster + empty_size) {
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if (block_group->free_space_ctl->free_space >
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max_extent_size)
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max_extent_size =
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block_group->free_space_ctl->free_space;
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spin_unlock(&block_group->free_space_ctl->tree_lock);
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goto loop;
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if (cached) {
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struct btrfs_free_space_ctl *ctl =
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block_group->free_space_ctl;
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spin_lock(&ctl->tree_lock);
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if (ctl->free_space <
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num_bytes + empty_cluster + empty_size) {
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if (ctl->free_space > max_extent_size)
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max_extent_size = ctl->free_space;
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spin_unlock(&ctl->tree_lock);
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goto loop;
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}
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spin_unlock(&ctl->tree_lock);
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}
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spin_unlock(&block_group->free_space_ctl->tree_lock);
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offset = btrfs_find_space_for_alloc(block_group, search_start,
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num_bytes, empty_size,
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