linux-kernel - [PATCH v4 2/2] btrfs: reserve new relocation block-group after successful relocation

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Date: Thu, 23 May 2024 17:21:59 +0200
From: Johannes Thumshirn <jth@...nel.org>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, 
 David Sterba <dsterba@...e.com>
Cc: Hans Holmberg <Hans.Holmberg@....com>, linux-btrfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Naohiro Aota <naohiro.aota@....com>, 
 Filipe Manana <fdmanana@...e.com>, 
 Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v4 2/2] btrfs: reserve new relocation block-group after
 successful relocation

From: Johannes Thumshirn <johannes.thumshirn@....com>

After we've committed a relocation transaction, we know we have just freed
up space. Set it as hint for the next relocation.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@....com>
---
 fs/btrfs/relocation.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 5f1a909a1d91..02a9ebf96a95 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -3811,6 +3811,13 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
 	ret = btrfs_commit_transaction(trans);
 	if (ret && !err)
 		err = ret;
+
+	/*
+	 * We know we have just freed space, set it as hint for the
+	 * next relocation.
+	 */
+	if (!err)
+		btrfs_reserve_relocation_bg(fs_info);
 out_free:
 	ret = clean_dirty_subvols(rc);
 	if (ret < 0 && !err)

-- 
2.43.0