From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EB04919258E; Tue, 6 Jan 2026 17:17:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767719822; cv=none; b=OV4guVPwm+JP8RrfZa+qblUHrkcStb44dix4WnhaGbWZLEvJB/kr5KqDzjXZkXOs8CxmkEw770DYnFT4LWf1p8wGVs8u5CZWJW9RSEc9WZpvibHo/yoROklxA7jybPIz6DR0c8gdpQ5H8asZu5AFIPMEAa9F/lp0VWT6+E5QPfQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767719822; c=relaxed/simple; bh=hhyZ2KMsl3LFTWivDFwyvkzV3dSg6ozrPM+zWyn3bOE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LDHEmbEXX5hO2fuZNNmbJSFwVgXa+DMLMlZIXQ10xWC3i3EwdvI9ph2YiyaDfBBzH/QVVLzW3HHFP2cHThs2z4AVRbK1rBNs17raPdDBEXumvtjcH4bR0oAoWpA+duN9aQKrXeMzRyiiPCkE2Yu4r2vpOPd2Gb/Lzid7Lwycrgw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=tIMGgz7J; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="tIMGgz7J" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5C079C116C6; Tue, 6 Jan 2026 17:17:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767719821; bh=hhyZ2KMsl3LFTWivDFwyvkzV3dSg6ozrPM+zWyn3bOE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tIMGgz7J+8zdNincY8o1aZORzGm7It7U9gSJtKraTEqgEk7oSGa8n7XpyvWSmchzr lwKKgTCijAcDhRxFWGt8QezNs5yYQ1AYGpvUpYgaZxbvT8yiLg21mHP/d7+hfhh+8Z 6ZhZ7HC9oHxxdjwYKeF6XDUHnL3xsu7bdU12r8Qw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qu Wenruo , David Sterba , Sasha Levin Subject: [PATCH 6.12 033/567] btrfs: scrub: always update btrfs_scrub_progress::last_physical Date: Tue, 6 Jan 2026 17:56:55 +0100 Message-ID: <20260106170452.566436630@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260106170451.332875001@linuxfoundation.org> References: <20260106170451.332875001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Qu Wenruo [ Upstream commit 54df8b80cc63aa0f22c4590cad11542731ed43ff ] [BUG] When a scrub failed immediately without any byte scrubbed, the returned btrfs_scrub_progress::last_physical will always be 0, even if there is a non-zero @start passed into btrfs_scrub_dev() for resume cases. This will reset the progress and make later scrub resume start from the beginning. [CAUSE] The function btrfs_scrub_dev() accepts a @progress parameter to copy its updated progress to the caller, there are cases where we either don't touch progress::last_physical at all or copy 0 into last_physical: - last_physical not updated at all If some error happened before scrubbing any super block or chunk, we will not copy the progress, leaving the @last_physical untouched. E.g. failed to allocate @sctx, scrubbing a missing device or even there is already a running scrub and so on. All those cases won't touch @progress at all, resulting the last_physical untouched and will be left as 0 for most cases. - Error out before scrubbing any bytes In those case we allocated @sctx, and sctx->stat.last_physical is all zero (initialized by kvzalloc()). Unfortunately some critical errors happened during scrub_enumerate_chunks() or scrub_supers() before any stripe is really scrubbed. In that case although we will copy sctx->stat back to @progress, since no byte is really scrubbed, last_physical will be overwritten to 0. [FIX] Make sure the parameter @progress always has its @last_physical member updated to @start parameter inside btrfs_scrub_dev(). At the very beginning of the function, set @progress->last_physical to @start, so that even if we error out without doing progress copying, last_physical is still at @start. Then after we got @sctx allocated, set sctx->stat.last_physical to @start, this will make sure even if we didn't get any byte scrubbed, at the progress copying stage the @last_physical is not left as zero. This should resolve the resume progress reset problem. Signed-off-by: Qu Wenruo Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/scrub.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index 9f811ea604f71..3cbb9f22d3944 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -2943,6 +2943,10 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, unsigned int nofs_flag; bool need_commit = false; + /* Set the basic fallback @last_physical before we got a sctx. */ + if (progress) + progress->last_physical = start; + if (btrfs_fs_closing(fs_info)) return -EAGAIN; @@ -2961,6 +2965,7 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start, sctx = scrub_setup_ctx(fs_info, is_dev_replace); if (IS_ERR(sctx)) return PTR_ERR(sctx); + sctx->stat.last_physical = start; ret = scrub_workers_get(fs_info); if (ret) -- 2.51.0