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btrfs: send: iterate waiting dir move rbtree only once when processing refs

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When processing the new references for an inode, we unnecessarily iterate
twice the waiting dir moves rbtree, once with is_waiting_for_move() and
if we found an entry in the rbtree, we iterate it again with a call to
get_waiting_dir_move(). This is pointless, we can make this simpler and
more efficient by calling only get_waiting_dir_move(), so just do that.

This patch is part of a larger patchset and the changelog of the last
patch in the series contains a sample performance test and results.
The patches that comprise the patchset are the following:

  btrfs: send: directly return from did_overwrite_ref() and simplify it
  btrfs: send: avoid unnecessary generation search at did_overwrite_ref()
  btrfs: send: directly return from will_overwrite_ref() and simplify it
  btrfs: send: avoid extra b+tree searches when checking reference overrides
  btrfs: send: remove send_progress argument from can_rmdir()
  btrfs: send: avoid duplicated orphan dir allocation and initialization
  btrfs: send: avoid unnecessary orphan dir rbtree search at can_rmdir()
  btrfs: send: reduce searches on parent root when checking if dir can be removed
  btrfs: send: iterate waiting dir move rbtree only once when processing refs
  btrfs: send: initialize all the red black trees earlier
  btrfs: send: genericize the backref cache to allow it to be reused
  btrfs: adapt lru cache to allow for 64 bits keys on 32 bits systems
  btrfs: send: cache information about created directories
  btrfs: allow a generation number to be associated with lru cache entries
  btrfs: add an api to delete a specific entry from the lru cache
  btrfs: send: use the lru cache to implement the name cache
  btrfs: send: update size of roots array for backref cache entries
  btrfs: send: cache utimes operations for directories if possible

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2023-01-11 11:36:10 +00:00 committed by David Sterba
parent 474e4761f6
commit 8c139e1d78
1 changed files with 2 additions and 5 deletions
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7
fs/btrfs/send.c
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@ -4335,12 +4335,9 @@ static int process_recorded_refs(struct send_ctx *sctx, int *pending_move)
* the source path when performing its rename
* operation.
*/
if (is_waiting_for_move(sctx, ow_inode)) {
wdm = get_waiting_dir_move(sctx,
ow_inode);
ASSERT(wdm);
wdm = get_waiting_dir_move(sctx, ow_inode);
if (wdm)
wdm->orphanized = true;
}
/*
* Make sure we clear our orphanized inode's