From patchwork Sat Feb 4 14:58:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 13128724 Received: from mail1.bemta34.messagelabs.com (mail1.bemta34.messagelabs.com [195.245.231.3]) (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 E09E42568 for ; Sat, 4 Feb 2023 14:59:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fujitsu.com; s=170520fj; t=1675522752; i=@fujitsu.com; bh=iZXWDU8e1IDq/UlXTzSKcomjkFKqhLWmrwUndstFZbY=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Y3EvQ3MX1dUVylN/yQ8OGaXHEumBT6+fn+8Ln7a8/pWTcxYfrNQXWFWPTEWYyW2lz 4P14dnakHApQCS5+ZJRwlsN2LaFXnFGrKNjtgvTaOObd4agLZsZokSnkrtzbBme2J2 SjCM0MOtozK0sU5nJVtnL+N/csvzfqIbW0UXl0fLA5bvKrTJViTwxgV1U4F0NRgqD3 sUSfr2PGs3CT9JJY+hAjEuO8ZB19cYwrXJh58fMRQ7glVi5GeAGm4agSkY2AzkvF4q yjE8zgj50K0t1o5B0GGZbsknVdgU23cJmFgdIcawwcpS9QY8J335OYz69KQacG0CFM jbqJ7jshZeQTA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLKsWRWlGSWpSXmKPExsViZ8ORqLuv6F6 ywYvPohbTp15gtNhy7B6jxeUnfBanJyxistj9+iabxZ69J1ksLu+aw2Zxb81/Votdf3awW6z8 8YfVgcvj1CIJj80rtDwW73nJ5LFpVSebx6ZPk9g9Xmyeyejx8ektFo/Pm+QCOKJYM/OS8isSW DM2rqsv2KtcsbNtG0sD4yPZLkYuDiGBLYwSOxrOsUM4K5gkLt0+zgjh7GWUmDJxH5DDycEmoC NxYcFfVpCEiMAkRoljN24ygySYBcol9m+8wQZiCwt4StyYuJEFxGYRUJH4sqUVLM4r4CLxr+8 lO4gtIaAgMeXhe7BeTgFXibfvz4LVCAHVNN/5zQRRLyhxcuYTFoj5EhIHX7wAqucA6lWSmNkd DzGmUqL1wy8WCFtN4uq5TcwTGAVnIemehaR7ASPTKkbT4tSistQiXRO9pKLM9IyS3MTMHL3EK t1EvdRS3fLU4hJdI73E8mK91OJiveLK3OScFL281JJNjMCYSilWPLaD8V/vX71DjJIcTEqivP 3+d5OF+JLyUyozEosz4otKc1KLDzHKcHAoSfBeL7iXLCRYlJqeWpGWmQOMb5i0BAePkgjvb5A 0b3FBYm5xZjpE6hSjLsfahgN7mYVY8vLzUqXEeVsLgYoEQIoySvPgRsBSzSVGWSlhXkYGBgYh noLUotzMElT5V4ziHIxKwry3QFbxZOaVwG16BXQEE9AR3QZ3QY4oSURISTUwzTyQtXpv5pF3W +Jr5zIb8+xfUVp4emrIwQlWS7gb/BZLZB+uCuiu3F2Xum7jssxl+7zsO77sjlaav+pIl/uNVA HJRfnOTQ9YesITLXbP5jwleLjt5cKYJt8vbzjEbK9usTc9W/P797HoCZ8ynN5xpTnODXfNZEm p0gk90H59tfOszWlvq06tevLLdSsH/0+v/jKpjSkVBc9MnSWFftQmrJ+Y4l14rtnCJP71gyO9 E39qb834I6u6zL/ZsuTl95Ijuxf+abh97u8+R24O14gD6x44/DOZwfaTf0Kt5bGsHy8Eb+WvF n2aKmEyI6ZMOqR4huK6p3PZ5zIwp/02v9dSaMR6uv9GhcTX69+NOA5fVmIpzkg01GIuKk4EAD YN41ywAwAA X-Env-Sender: ruansy.fnst@fujitsu.com X-Msg-Ref: server-6.tower-571.messagelabs.com!1675522750!174342!1 X-Originating-IP: [62.60.8.97] X-SYMC-ESS-Client-Auth: outbound-route-from=pass X-StarScan-Received: X-StarScan-Version: 9.102.2; banners=-,-,- X-VirusChecked: Checked Received: (qmail 30248 invoked from network); 4 Feb 2023 14:59:10 -0000 Received: from unknown (HELO n03ukasimr01.n03.fujitsu.local) (62.60.8.97) by server-6.tower-571.messagelabs.com with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP; 4 Feb 2023 14:59:10 -0000 Received: from n03ukasimr01.n03.fujitsu.local (localhost [127.0.0.1]) by n03ukasimr01.n03.fujitsu.local (Postfix) with ESMTP id F423E100195; Sat, 4 Feb 2023 14:59:09 +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 n03ukasimr01.n03.fujitsu.local (Postfix) with ESMTPS id E6BC3100188; Sat, 4 Feb 2023 14:59:09 +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; Sat, 4 Feb 2023 14:59:06 +0000 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [PATCH v9 3/3] mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind Date: Sat, 4 Feb 2023 14:58:38 +0000 Message-ID: <1675522718-88-4-git-send-email-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1675522718-88-1-git-send-email-ruansy.fnst@fujitsu.com> References: <1675522718-88-1-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 | 28 +++++++++++++++++++++++++++- include/linux/mm.h | 1 + 3 files changed, 30 insertions(+), 2 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index da4438f3188c..40274d19f4f9 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 3830f908e215..5c1e678a1285 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 +172,9 @@ xfs_dax_notify_ddev_failure( xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); if (!error) error = -EFSCORRUPTED; - } + } else if (mf_flags & MF_MEM_PRE_REMOVE) + xfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT); + return error; } @@ -182,12 +188,24 @@ 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()!"); return -EIO; } + if (mf_flags & MF_MEM_PRE_REMOVE) { + xfs_info(mp, "device is about to be removed!"); + down_write(&mp->m_super->s_umount); + error = sync_filesystem(mp->m_super); + /* invalidate_inode_pages2() invalidates dax mapping */ + super_drop_pagecache(mp->m_super, invalidate_inode_pages2); + up_write(&mp->m_super->s_umount); + if (error) + return error; + } + if (mp->m_rtdev_targp && mp->m_rtdev_targp->bt_daxdev == dax_dev) { xfs_debug(mp, "notify_failure() not supported on realtime device!"); @@ -196,6 +214,8 @@ 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 +229,12 @@ 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; 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);