From patchwork Fri Feb 17 14:48:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 13144846 Received: from mail1.bemta37.messagelabs.com (mail1.bemta37.messagelabs.com [85.158.142.113]) (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 E07E97475 for ; Fri, 17 Feb 2023 14:49:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fujitsu.com; s=170520fj; t=1676645343; i=@fujitsu.com; bh=A2wAW+QXyIH1Dyff7tecUiExycjpgnQWjt6WHBG3wNQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Ji0uCx/Zhz36NWi/Lm2xY2Wrzxh9bC6giHlydN1BJicaEVwD+b6ixwx18s0xHKZh5 g2tZu78f0j6AojtVlECNTkBLP8jjP1AgyyVPFxLTddQOp6qJSjfXiyV0Cd5bwZPMrz +aHQpBcF2fN7iL3SkBDN6+zG68Y4vSiUKAVUrihkFK6nK6vaBQoDwMcHc/3oVOiShA xTTA+p+69bfjR9RNY9S52bf3jgvkA0+ynFs7S96HtTXXCeOH1+HjABDydUejLbJI6n fYzwWI+XpwFjnoEwbH+XE5c02KJU0S0uLopeKSEdGR9ZxofxTgY/X4nhkrFvAD8T/3 BWuHfeX6ChZmg== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrBKsWRWlGSWpSXmKPExsViZ8OxWffe5Pf JBpdm8VnMWb+GzWL61AuMFluO3WO0uPyEz+L0hEVMFrtf32Sz2LP3JIvFvTX/WS12/dnBbrHy xx9Wi98/5rA5cHucWiThsXmFlsfiPS+ZPDat6mTz2PRpErvHiRm/WTxebJ7J6PHx6S0Wj8+b5 AI4o1gz85LyKxJYMyY+3cdcsF654t/Hz4wNjGdluxi5OIQENjBKPP7wix3CWcIk8f3bMyCHE8 jZxygx734RiM0moCNxYcFfVhBbRKBQYsWpoywgDcwCxxkltizfxAySEBbwkmh5tA2siEVAVeL sgg1gcV4BF4mnq/4xgtgSAgoSUx6+B4tzCrhKLJ18kg1imYvEgbYTjBD1ghInZz5hAbGZBSQk Dr54AVTPAdSrJDGzOx5iTKVE64dfLBC2msTVc5uYJzAKzkLSPQtJ9wJGplWMZsWpRWWpRbqme klFmekZJbmJmTl6iVW6iXqppbp5+UUlGbqGeonlxXqpxcV6xZW5yTkpenmpJZsYgZGWUpzMsI Oxs++v3iFGSQ4mJVFew4T3yUJ8SfkplRmJxRnxRaU5qcWHGGU4OJQkeE/3A+UEi1LTUyvSMnO AUQ+TluDgURLhnZwPlOYtLkjMLc5Mh0idYtTlWNtwYC+zEEtefl6qlDjvjElARQIgRRmleXAj YAnoEqOslDAvIwMDgxBPQWpRbmYJqvwrRnEORiVh3ucTgabwZOaVwG16BXQEE9ARC5jfghxRk oiQkmpgit5+/KbrI8s/D299WSwXPSfiRz23aYBGsVWqzeHql6GXQ9ZOnLxgw85szvBMx4Uzq+ z+ivGdme0rt1Vk3v2UWataMlOb2QVz0vKKSyS+NJmvjZWYeuJHzjvmhYaeen95v7/yWt50uKb PYi1LV9F+s2OW0Uu/LXD/viHpHNdzs60lljsfxbfdVew8X+V1PNipTFD84budefsfKQh7l5+u Zzjwk/unZIG5hNAz1ypOo+U+AZ6SJ9bNuTL/0QOv4ydObnatnvfEqzZOVkArK9Iw8Ow1Jp+JS +otf78M4JZ8/zstVfaSobapY/yxqbI55htnxhnyXZvfwMl6OTWocqFO2YMthVt/FfTa11VF5R QrsRRnJBpqMRcVJwIAW0qBWbsDAAA= X-Env-Sender: ruansy.fnst@fujitsu.com X-Msg-Ref: server-7.tower-732.messagelabs.com!1676645341!163832!1 X-Originating-IP: [62.60.8.179] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.102.2; banners=-,-,- X-VirusChecked: Checked Received: (qmail 14491 invoked from network); 17 Feb 2023 14:49:02 -0000 Received: from unknown (HELO n03ukasimr04.n03.fujitsu.local) (62.60.8.179) by server-7.tower-732.messagelabs.com with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 17 Feb 2023 14:49:02 -0000 Received: from n03ukasimr04.n03.fujitsu.local (localhost [127.0.0.1]) by n03ukasimr04.n03.fujitsu.local (Postfix) with ESMTP id 880897C; Fri, 17 Feb 2023 14:49:01 +0000 (GMT) Received: from R01UKEXCASM223.r01.fujitsu.local (R01UKEXCASM223 [10.182.185.121]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by n03ukasimr04.n03.fujitsu.local (Postfix) with ESMTPS id 7B7BE7B; Fri, 17 Feb 2023 14:49:01 +0000 (GMT) Received: from localhost.localdomain (10.167.225.141) by R01UKEXCASM223.r01.fujitsu.local (10.182.185.121) with Microsoft SMTP Server (TLS) id 15.0.1497.42; Fri, 17 Feb 2023 14:48:57 +0000 From: Shiyang Ruan To: , , , CC: , , , , , , , Subject: [PATCH v10 3/3] mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind Date: Fri, 17 Feb 2023 14:48:32 +0000 Message-ID: <1676645312-13-4-git-send-email-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1676645312-13-1-git-send-email-ruansy.fnst@fujitsu.com> References: <1676645312-13-1-git-send-email-ruansy.fnst@fujitsu.com> Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Originating-IP: [10.167.225.141] X-ClientProxiedBy: G08CNEXCHPEKD07.g08.fujitsu.local (10.167.33.80) To R01UKEXCASM223.r01.fujitsu.local (10.182.185.121) X-Virus-Scanned: ClamAV using ClamSMTP This patch is inspired by Dan's "mm, dax, pmem: Introduce dev_pagemap_failure()"[1]. With the help of dax_holder and ->notify_failure() mechanism, the pmem driver is able to ask filesystem (or mapped device) on it to unmap all files in use and notify processes who are using those files. Call trace: trigger unbind -> unbind_store() -> ... (skip) -> devres_release_all() # was pmem driver ->remove() in v1 -> kill_dax() -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_PRE_REMOVE) -> xfs_dax_notify_failure() Introduce MF_MEM_PRE_REMOVE to let filesystem know this is a remove event. So do not shutdown filesystem directly if something not supported, or if failure range includes metadata area. Make sure all files and processes are handled correctly. [1]: https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ Signed-off-by: Shiyang Ruan --- drivers/dax/super.c | 3 ++- fs/xfs/xfs_notify_failure.c | 26 ++++++++++++++++++++++++++ include/linux/mm.h | 1 + 3 files changed, 29 insertions(+), 1 deletion(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index c4c4728a36e4..2e1a35e82fce 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -323,7 +323,8 @@ void kill_dax(struct dax_device *dax_dev) return; if (dax_dev->holder_data != NULL) - dax_holder_notify_failure(dax_dev, 0, U64_MAX, 0); + dax_holder_notify_failure(dax_dev, 0, U64_MAX, + MF_MEM_PRE_REMOVE); clear_bit(DAXDEV_ALIVE, &dax_dev->flags); synchronize_srcu(&dax_srcu); diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c index 7d46a7e4980f..5f915cfc9632 100644 --- a/fs/xfs/xfs_notify_failure.c +++ b/fs/xfs/xfs_notify_failure.c @@ -22,6 +22,7 @@ #include #include +#include struct xfs_failure_info { xfs_agblock_t startblock; @@ -77,6 +78,9 @@ xfs_dax_failure_fn( if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { + /* The device is about to be removed. Not a really failure. */ + if (notify->mf_flags & MF_MEM_PRE_REMOVE) + return 0; notify->want_shutdown = true; return 0; } @@ -168,7 +172,11 @@ xfs_dax_notify_ddev_failure( xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); if (!error) error = -EFSCORRUPTED; + } else if (mf_flags & MF_MEM_PRE_REMOVE) { + error = thaw_super(mp->m_super); + xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); } + return error; } @@ -182,6 +190,7 @@ xfs_dax_notify_failure( struct xfs_mount *mp = dax_holder(dax_dev); u64 ddev_start; u64 ddev_end; + int error; if (!(mp->m_super->s_flags & SB_BORN)) { xfs_warn(mp, "filesystem is not ready for notify_failure()!"); @@ -196,6 +205,8 @@ xfs_dax_notify_failure( if (mp->m_logdev_targp && mp->m_logdev_targp->bt_daxdev == dax_dev && mp->m_logdev_targp != mp->m_ddev_targp) { + if (mf_flags & MF_MEM_PRE_REMOVE) + return 0; xfs_err(mp, "ondisk log corrupt, shutting down fs!"); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); return -EFSCORRUPTED; @@ -209,6 +220,12 @@ xfs_dax_notify_failure( ddev_start = mp->m_ddev_targp->bt_dax_part_off; ddev_end = ddev_start + bdev_nr_bytes(mp->m_ddev_targp->bt_bdev) - 1; + /* Notify failure on the whole device */ + if (offset == 0 && len == U64_MAX) { + offset = ddev_start; + len = bdev_nr_bytes(mp->m_ddev_targp->bt_bdev); + } + /* Ignore the range out of filesystem area */ if (offset + len - 1 < ddev_start) return -ENXIO; @@ -225,6 +242,15 @@ xfs_dax_notify_failure( if (offset + len - 1 > ddev_end) len = ddev_end - offset + 1; + if (mf_flags & MF_MEM_PRE_REMOVE) { + xfs_info(mp, "device is about to be removed!"); + error = freeze_super(mp->m_super); + if (error) + return error; + /* invalidate_inode_pages2() invalidates dax mapping */ + super_drop_pagecache(mp->m_super, invalidate_inode_pages2); + } + return xfs_dax_notify_ddev_failure(mp, BTOBB(offset), BTOBB(len), mf_flags); } diff --git a/include/linux/mm.h b/include/linux/mm.h index 8f857163ac89..9711dbc9451f 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3424,6 +3424,7 @@ enum mf_flags { MF_UNPOISON = 1 << 4, MF_SW_SIMULATED = 1 << 5, MF_NO_RETRY = 1 << 6, + MF_MEM_PRE_REMOVE = 1 << 7, }; int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, unsigned long count, int mf_flags);