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 A518134F486; Wed, 3 Dec 2025 16:05:01 +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=1764777901; cv=none; b=MDcYj5lqREKick4wNuC/dZNkFjJnzlmTgpIA7Ly/bUGNxWSldog3YOjwjJQrBWF1AzG91ISd7aztvd6eYz6bIaEDS6tIuZ1SfUcFjB/ttSN1iVpDAcJLmgmRsvQuAHb+2vLd70LdhkLAOl1BbdnkD8HV7JguMxUoPMpBEwqvim8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764777901; c=relaxed/simple; bh=3EhMsXNX5GphyP6YhhHWbsH+ISK6dNZtgDUuOnqs214=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eX5Vr+HmFM3w90g0OwOEQl8ulMBJB0wJNtqvb2ipeqci1CscjHKV9EoecupJFSt95c5BEGBTAOMSyFEXhGpufBk2zIduVDJxP5grNOVpXAjIqiN0/Bbz4qugM8ySaWQVNJ0ieGdg+hCFXWa2HKmUJfEMUahlf0/KF9HDl0ropiE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=v7FkLnqW; 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="v7FkLnqW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0AB59C4CEF5; Wed, 3 Dec 2025 16:05:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1764777901; bh=3EhMsXNX5GphyP6YhhHWbsH+ISK6dNZtgDUuOnqs214=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=v7FkLnqWkSMUz9EWRjmdqsNwzipViGOO4vE+ddYPbiWX5IUTTB+oExuzaJMtWTI3c th7FiZ/LWmp1RrvCZrpcvy4J8KaU5+1aBkkcqUmRVMFtDl2iGo9UtsM86NQ4kgeTAa BWvvdTXcb5w8ZmPMBhYmH3UzTeQvk9o78YHGvVrI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chi Zhiling , Namjae Jeon , Sasha Levin Subject: [PATCH 5.15 183/392] exfat: limit log print for IO error Date: Wed, 3 Dec 2025 16:25:33 +0100 Message-ID: <20251203152420.815953520@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251203152414.082328008@linuxfoundation.org> References: <20251203152414.082328008@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 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chi Zhiling [ Upstream commit 6dfba108387bf4e71411b3da90b2d5cce48ba054 ] For exFAT filesystems with 4MB read_ahead_size, removing the storage device when the read operation is in progress, which cause the last read syscall spent 150s [1]. The main reason is that exFAT generates excessive log messages [2]. After applying this patch, approximately 300,000 lines of log messages were suppressed, and the delay of the last read() syscall was reduced to about 4 seconds. [1]: write(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072 <0.000120> read(4, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072 <0.000032> write(5, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 131072) = 131072 <0.000119> read(4, 0x7fccf28ae000, 131072) = -1 EIO (Input/output error) <150.186215> [2]: [ 333.696603] exFAT-fs (vdb): error, failed to access to FAT (entry 0x0000d780, err:-5) [ 333.697378] exFAT-fs (vdb): error, failed to access to FAT (entry 0x0000d780, err:-5) [ 333.698156] exFAT-fs (vdb): error, failed to access to FAT (entry 0x0000d780, err:-5) Signed-off-by: Chi Zhiling Signed-off-by: Namjae Jeon Signed-off-by: Sasha Levin --- fs/exfat/fatent.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/exfat/fatent.c b/fs/exfat/fatent.c index c5f6015a947ce..4a6af08410a3d 100644 --- a/fs/exfat/fatent.c +++ b/fs/exfat/fatent.c @@ -88,35 +88,36 @@ int exfat_ent_get(struct super_block *sb, unsigned int loc, int err; if (!is_valid_cluster(sbi, loc)) { - exfat_fs_error(sb, "invalid access to FAT (entry 0x%08x)", + exfat_fs_error_ratelimit(sb, + "invalid access to FAT (entry 0x%08x)", loc); return -EIO; } err = __exfat_ent_get(sb, loc, content); if (err) { - exfat_fs_error(sb, + exfat_fs_error_ratelimit(sb, "failed to access to FAT (entry 0x%08x, err:%d)", loc, err); return err; } if (*content == EXFAT_FREE_CLUSTER) { - exfat_fs_error(sb, + exfat_fs_error_ratelimit(sb, "invalid access to FAT free cluster (entry 0x%08x)", loc); return -EIO; } if (*content == EXFAT_BAD_CLUSTER) { - exfat_fs_error(sb, + exfat_fs_error_ratelimit(sb, "invalid access to FAT bad cluster (entry 0x%08x)", loc); return -EIO; } if (*content != EXFAT_EOF_CLUSTER && !is_valid_cluster(sbi, *content)) { - exfat_fs_error(sb, + exfat_fs_error_ratelimit(sb, "invalid access to FAT (entry 0x%08x) bogus content (0x%08x)", loc, *content); return -EIO; -- 2.51.0