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 8C65713D28F for ; Sun, 15 Dec 2024 08:53:56 +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=1734252836; cv=none; b=VI2xrpqkQBejeCFKwfGFIQfC92jpKApecuP1pKVZgie7ElyTNIpa+fNmbFqZInYcLJTVSf2AbUCW7+d+B0aJJvc3wHmPcaPF+adtr8xm4EtY7om6OGWpdrGg2K08HXZhE80hx+eDuyYP0C8ioAWYnf7SMbb5azceV4un9Db9uwE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734252836; c=relaxed/simple; bh=N4FURxuyAQKwYvk0kG/bf388tHDA9hwDSOSa1LCs+BM=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=sMXKDy532UHuX1D0Khq5wvy8vWxzHq/y6ugcLrWsWz2SxSKOIiUs6fNC3ygHdVYLzekxB/hyq3LCryuzf6bLIcZ5gwP11Em3CzVcHQ4zEShFUWKbS8I7l3Ku8dSDWz60g0QYlnQ6SHnXXk2f3qHVQmLSrGww5nJAklfoRqCMfWM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ZtDQCn4w; 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="ZtDQCn4w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E3040C4CECE; Sun, 15 Dec 2024 08:53:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1734252836; bh=N4FURxuyAQKwYvk0kG/bf388tHDA9hwDSOSa1LCs+BM=; h=Subject:To:Cc:From:Date:From; b=ZtDQCn4wWZxxY4oMvNUbY50JvrcyfVZSJ5UvwbQp4zx6XLiRDvlG0rwK7Mwbsxoaw fVEtyeLUJvTlaKXUotCOD7OXZzphmLW/mVRX7v1mP3GPWQHhWJZs71nu5z2v04mQ2P YnD5Tm/rux7kD/3fG81kLE1mZX4Km2FRua4WFHu8= Subject: FAILED: patch "[PATCH] xfs: fix off-by-one error in fsmap's end_daddr usage" failed to apply to 6.12-stable tree To: djwong@kernel.org,hch@lst.de,stable@vger.kernel.org,wozizhi@huawei.com Cc: From: Date: Sun, 15 Dec 2024 09:53:53 +0100 Message-ID: <2024121553-prison-usage-c221@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.12-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.12.y git checkout FETCH_HEAD git cherry-pick -x a440a28ddbdcb861150987b4d6e828631656b92f # git commit -s git send-email --to '' --in-reply-to '2024121553-prison-usage-c221@gregkh' --subject-prefix 'PATCH 6.12.y' HEAD^.. Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From a440a28ddbdcb861150987b4d6e828631656b92f Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Mon, 2 Dec 2024 10:57:24 -0800 Subject: [PATCH] xfs: fix off-by-one error in fsmap's end_daddr usage In commit ca6448aed4f10a, we created an "end_daddr" variable to fix fsmap reporting when the end of the range requested falls in the middle of an unknown (aka free on the rmapbt) region. Unfortunately, I didn't notice that the the code sets end_daddr to the last sector of the device but then uses that quantity to compute the length of the synthesized mapping. Zizhi Wo later observed that when end_daddr isn't set, we still don't report the last fsblock on a device because in that case (aka when info->last is true), the info->high mapping that we pass to xfs_getfsmap_group_helper has a startblock that points to the last fsblock. This is also wrong because the code uses startblock to compute the length of the synthesized mapping. Fix the second problem by setting end_daddr unconditionally, and fix the first problem by setting start_daddr to one past the end of the range to query. Cc: # v6.11 Fixes: ca6448aed4f10a ("xfs: Fix missing interval for missing_owner in xfs fsmap") Signed-off-by: "Darrick J. Wong" Reported-by: Zizhi Wo Reviewed-by: Christoph Hellwig diff --git a/fs/xfs/xfs_fsmap.c b/fs/xfs/xfs_fsmap.c index 82f2e0dd2249..3290dd8524a6 100644 --- a/fs/xfs/xfs_fsmap.c +++ b/fs/xfs/xfs_fsmap.c @@ -163,7 +163,8 @@ struct xfs_getfsmap_info { xfs_daddr_t next_daddr; /* next daddr we expect */ /* daddr of low fsmap key when we're using the rtbitmap */ xfs_daddr_t low_daddr; - xfs_daddr_t end_daddr; /* daddr of high fsmap key */ + /* daddr of high fsmap key, or the last daddr on the device */ + xfs_daddr_t end_daddr; u64 missing_owner; /* owner of holes */ u32 dev; /* device id */ /* @@ -387,8 +388,8 @@ xfs_getfsmap_group_helper( * we calculated from userspace's high key to synthesize the record. * Note that if the btree query found a mapping, there won't be a gap. */ - if (info->last && info->end_daddr != XFS_BUF_DADDR_NULL) - frec->start_daddr = info->end_daddr; + if (info->last) + frec->start_daddr = info->end_daddr + 1; else frec->start_daddr = xfs_gbno_to_daddr(xg, startblock); @@ -736,11 +737,10 @@ xfs_getfsmap_rtdev_rtbitmap_helper( * we calculated from userspace's high key to synthesize the record. * Note that if the btree query found a mapping, there won't be a gap. */ - if (info->last && info->end_daddr != XFS_BUF_DADDR_NULL) { - frec.start_daddr = info->end_daddr; - } else { + if (info->last) + frec.start_daddr = info->end_daddr + 1; + else frec.start_daddr = xfs_rtb_to_daddr(mp, start_rtb); - } frec.len_daddr = XFS_FSB_TO_BB(mp, rtbcount); return xfs_getfsmap_helper(tp, info, &frec); @@ -933,7 +933,10 @@ xfs_getfsmap( struct xfs_trans *tp = NULL; struct xfs_fsmap dkeys[2]; /* per-dev keys */ struct xfs_getfsmap_dev handlers[XFS_GETFSMAP_DEVS]; - struct xfs_getfsmap_info info = { NULL }; + struct xfs_getfsmap_info info = { + .fsmap_recs = fsmap_recs, + .head = head, + }; bool use_rmap; int i; int error = 0; @@ -998,9 +1001,6 @@ xfs_getfsmap( info.next_daddr = head->fmh_keys[0].fmr_physical + head->fmh_keys[0].fmr_length; - info.end_daddr = XFS_BUF_DADDR_NULL; - info.fsmap_recs = fsmap_recs; - info.head = head; /* For each device we support... */ for (i = 0; i < XFS_GETFSMAP_DEVS; i++) { @@ -1013,17 +1013,23 @@ xfs_getfsmap( break; /* - * If this device number matches the high key, we have - * to pass the high key to the handler to limit the - * query results. If the device number exceeds the - * low key, zero out the low key so that we get - * everything from the beginning. + * If this device number matches the high key, we have to pass + * the high key to the handler to limit the query results, and + * set the end_daddr so that we can synthesize records at the + * end of the query range or device. */ if (handlers[i].dev == head->fmh_keys[1].fmr_device) { dkeys[1] = head->fmh_keys[1]; info.end_daddr = min(handlers[i].nr_sectors - 1, dkeys[1].fmr_physical); + } else { + info.end_daddr = handlers[i].nr_sectors - 1; } + + /* + * If the device number exceeds the low key, zero out the low + * key so that we get everything from the beginning. + */ if (handlers[i].dev > head->fmh_keys[0].fmr_device) memset(&dkeys[0], 0, sizeof(struct xfs_fsmap));