From: Mark Harmstone <mark@harmstone.com>
To: linux-btrfs@vger.kernel.org
Cc: Mark Harmstone <mark@harmstone.com>
Subject: [PATCH] btrfs: fix bytes_may_use leak in do_remap_reloc_trans()
Date: Mon, 23 Mar 2026 14:36:51 +0000 [thread overview]
Message-ID: <20260323143704.119969-1-mark@harmstone.com> (raw)
If the call to btrfs_reserve_extent() in do_remap_reloc_trans() returns
a smaller extent than we asked for, currently we're not undoing the
bytes_may_use change that we made. Fix this by calling
btrfs_space_info_update_bytes_may_use() again for the difference.
Signed-off-by: Mark Harmstone <mark@harmstone.com>
Fixes: fd6594b1446c ("btrfs: replace identity remaps with actual remaps when doing relocations")
---
fs/btrfs/relocation.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index 1c42c5180bddd5..c0bd6db6011965 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -5000,6 +5000,12 @@ static int do_remap_reloc_trans(struct btrfs_fs_info *fs_info,
return ret;
}
+ if (ins.offset < remap_length) {
+ spin_lock(&sinfo->lock);
+ btrfs_space_info_update_bytes_may_use(sinfo, ins.offset - remap_length);
+ spin_unlock(&sinfo->lock);
+ }
+
made_reservation = true;
new_addr = ins.objectid;
--
2.52.0
reply other threads:[~2026-03-23 14:37 UTC|newest]
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