From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 50CB823ABBE; Wed, 30 Sep 2026 18:54:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790794496; cv=none; b=uXuCZtY1ybYrM8VqWFCNARBI8wMXxx3W8Tp2iC4SoVPRi0SG0hDlrxSAvvX1QOBWCliec0fLEOVmB70XPvFG5tZRpM+jvCWXDH3a9nUdhxijZ4ETd4P5kvhuF0pje2KA3eYfgs2F4ubh5iyuer4YDo7QVH/KxQzHmtGTak4BO3M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790794496; c=relaxed/simple; bh=kydA5tql3/Zvwz2EfZkB9HFtlVCZj+3nINZqZiJrQSM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I1CKmN0nX1N7oY5iYAgDM5a3QhZnZMkgtRH6KhS6+M55Z2VXb6+9aPRYrAmy9sgL46y+ray+wCM4fSLkHKe/Sk2Q2Fc5wabP1LWNj3agJEPBPIET0J8LGk1yg1n/8vU2LvEzH7f22KvoWCv/z2n1Qrxm4RBMmHQ8WwPf2Rs3D1s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RYeHnjE8; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="RYeHnjE8" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE91B1F000FF; Wed, 30 Sep 2026 18:54:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790794495; bh=yLZJW6zW4nWqhL0cDsvMiEU4yBaRjx5si/DbawzQrCI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=RYeHnjE8eCXEDh3+77EwB12TTxDEH4LmK53AUTBSqW0Vh8dhUhMonmVxelgjnLfNO VXRNUdoLkdqsW2d1M1nA+5VVZUtc4cFHJ/syGO3idrW7u1EKSD3pjqQ5gtldgqJELs 6BJJUFhNLnr3JReWdIUiDSQUOGtR09KH9u212MiI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, KangNing Liao , Qu Wenruo , David Sterba , Sasha Levin Subject: [PATCH 6.6 0197/1193] btrfs: protect sb_write_pointer() with invalidate lock Date: Wed, 30 Sep 2026 17:14:41 +0200 Message-ID: <20260930152438.580794417@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152434.301151190@linuxfoundation.org> References: <20260930152434.301151190@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: KangNing Liao [ Upstream commit 123b9a545f4d0348e81f558a032bf2a93ee5722f ] sb_write_pointer() reads the super block from the block device page cache using read_cache_page_gfp(). This has the same race with BLKBSZSET as the one fixed by commit 3f29d661e568 ("btrfs: sync read disk super and set block size"). Take the mapping invalidate lock around read_cache_page_gfp() to serialize the read against block size changes. Signed-off-by: KangNing Liao Reviewed-by: Qu Wenruo Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/zoned.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/zoned.c b/fs/btrfs/zoned.c index b704df009fc5a..92ec2d91c41fe 100644 --- a/fs/btrfs/zoned.c +++ b/fs/btrfs/zoned.c @@ -130,8 +130,10 @@ static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones, u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) - BTRFS_SUPER_INFO_SIZE; + filemap_invalidate_lock(mapping); page[i] = read_cache_page_gfp(mapping, bytenr >> PAGE_SHIFT, GFP_NOFS); + filemap_invalidate_unlock(mapping); if (IS_ERR(page[i])) { if (i == 1) btrfs_release_disk_super(super[0]); -- 2.53.0