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btrfs: avoid starting new transaction when flushing delayed items and refs

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When flushing space we join a transaction to flush delayed items and
delayed references, in order to try to release space. However using
btrfs_join_transaction() not only joins an existing transaction as well
as it starts a new transaction if there is none open. If there is no
transaction open, we don't have neither delayed items nor delayed
references, so creating a new transaction is a waste of time, IO and
creates an unnecessary rotation of the backup roots without gaining any
benefits (including releasing space).

So use btrfs_join_transaction_nostart() when attempting to flush delayed
items and references.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2023-07-26 16:57:10 +01:00 committed by David Sterba
parent ed8947bc73
commit 2391245ac2
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/space-info.c
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@ -725,9 +725,11 @@ static void flush_space(struct btrfs_fs_info *fs_info,
else
nr = -1;
trans = btrfs_join_transaction(root);
trans = btrfs_join_transaction_nostart(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
if (ret == -ENOENT)
ret = 0;
break;
}
ret = btrfs_run_delayed_items_nr(trans, nr);
@ -743,9 +745,11 @@ static void flush_space(struct btrfs_fs_info *fs_info,
break;
case FLUSH_DELAYED_REFS_NR:
case FLUSH_DELAYED_REFS:
trans = btrfs_join_transaction(root);
trans = btrfs_join_transaction_nostart(root);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
if (ret == -ENOENT)
ret = 0;
break;
}
if (state == FLUSH_DELAYED_REFS_NR)