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btrfs: do not readahead in build_backref_tree 

Here we are just searching down to the bytenr we're building the backref
tree for, and all of it's paths to the roots.  These bytenrs are not
guaranteed to be anywhere near each other, so readahead just generates
extra latency.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-03-13 17:09:54 -04:00 committed by David Sterba
parent cd22a51c66
commit d7ff00f608
1 changed files with 0 additions and 2 deletions
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2
fs/btrfs/relocation.c
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@ -743,8 +743,6 @@ struct backref_node *build_backref_tree(struct reloc_control *rc,
err = -ENOMEM;
goto out;
}
path1->reada = READA_FORWARD;
path2->reada = READA_FORWARD;
node = alloc_backref_node(cache);
if (!node) {