From patchwork Sun Apr 10 17:16:23 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiyang Ruan X-Patchwork-Id: 12808215 Received: from heian.cn.fujitsu.com (mail.cn.fujitsu.com [183.91.158.132]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9D1EB137A for ; Sun, 10 Apr 2022 17:16:32 +0000 (UTC) IronPort-Data: A9a23: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 IronPort-HdrOrdr: A9a23:6G4Bcap521rlgzzkrg4nTksaV5oXeYIsimQD101hICG9E/bo8/xG+c536faaslgssQ4b8+xoVJPgfZq+z+8R3WByB8bAYOCOggLBQ72KhrGSoQEIdRefysdtkY9kc4VbTOb7FEVGi6/BizWQIpINx8am/cmT6dvj8w== X-IronPort-AV: E=Sophos;i="5.88,333,1635177600"; d="scan'208";a="123454431" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 11 Apr 2022 01:16:28 +0800 Received: from G08CNEXMBPEKD04.g08.fujitsu.local (unknown [10.167.33.201]) by cn.fujitsu.com (Postfix) with ESMTP id 7BE8A4D16FF4; Mon, 11 Apr 2022 01:16:24 +0800 (CST) Received: from G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.85) by G08CNEXMBPEKD04.g08.fujitsu.local (10.167.33.201) with Microsoft SMTP Server (TLS) id 15.0.1497.23; Mon, 11 Apr 2022 01:16:27 +0800 Received: from irides.mr.mr (10.167.225.141) by G08CNEXCHPEKD09.g08.fujitsu.local (10.167.33.209) with Microsoft SMTP Server id 15.0.1497.23 via Frontend Transport; Mon, 11 Apr 2022 01:16:23 +0800 From: Shiyang Ruan To: , , , , CC: , , , , Subject: [RFC PATCH] mm, pmem, xfs: Introduce MF_MEM_REMOVE for unbind Date: Mon, 11 Apr 2022 01:16:23 +0800 Message-ID: <20220410171623.3788004-1-ruansy.fnst@fujitsu.com> X-Mailer: git-send-email 2.35.1 Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-yoursite-MailScanner-ID: 7BE8A4D16FF4.A3A26 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: ruansy.fnst@fujitsu.com X-Spam-Status: No 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) -> pmem driver ->remove() -> kill_dax() -> dax_holder_notify_failure(dax_dev, 0, U64_MAX, MF_MEM_REMOVE) -> xfs_dax_notify_failure() Introduce MF_MEM_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. Based on "[PATCH v12] fsdax: introduce fs query to support reflink"[2] [1]: https://lore.kernel.org/linux-mm/161604050314.1463742.14151665140035795571.stgit@dwillia2-desk3.amr.corp.intel.com/ [2]: https://lore.kernel.org/linux-xfs/20220410160904.3758789-1-ruansy.fnst@fujitsu.com/T/#t Signed-off-by: Shiyang Ruan --- drivers/dax/super.c | 2 +- drivers/nvdimm/pmem.c | 3 ++- fs/xfs/xfs_notify_failure.c | 6 +++++- include/linux/mm.h | 1 + 4 files changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 619a05615497..52f820fdd8ff 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -312,7 +312,7 @@ 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_REMOVE); clear_bit(DAXDEV_ALIVE, &dax_dev->flags); synchronize_srcu(&dax_srcu); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index bd502957cfdf..72d9e69aea98 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -359,7 +359,6 @@ static void pmem_release_disk(void *__pmem) struct pmem_device *pmem = __pmem; dax_remove_host(pmem->disk); - kill_dax(pmem->dax_dev); put_dax(pmem->dax_dev); del_gendisk(pmem->disk); @@ -597,6 +596,8 @@ static void nd_pmem_remove(struct device *dev) pmem->bb_state = NULL; } nvdimm_flush(to_nd_region(dev->parent), NULL); + + kill_dax(pmem->dax_dev); } static void nd_pmem_shutdown(struct device *dev) diff --git a/fs/xfs/xfs_notify_failure.c b/fs/xfs/xfs_notify_failure.c index aac44f54feb4..f8b41085218b 100644 --- a/fs/xfs/xfs_notify_failure.c +++ b/fs/xfs/xfs_notify_failure.c @@ -73,7 +73,9 @@ xfs_dax_failure_fn( struct failure_info *notify = data; int error = 0; - if (XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || + /* Do not shutdown so early when device is to be removed */ + if (!(notify->mf_flags & MF_MEM_REMOVE) || + XFS_RMAP_NON_INODE_OWNER(rec->rm_owner) || (rec->rm_flags & (XFS_RMAP_ATTR_FORK | XFS_RMAP_BMBT_BLOCK))) { xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); return -EFSCORRUPTED; @@ -181,6 +183,8 @@ 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_REMOVE) + return -EOPNOTSUPP; xfs_err(mp, "ondisk log corrupt, shutting down fs!"); xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_ONDISK); return -EFSCORRUPTED; diff --git a/include/linux/mm.h b/include/linux/mm.h index 742604feef28..b47c3745782d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3225,6 +3225,7 @@ enum mf_flags { MF_MUST_KILL = 1 << 2, MF_SOFT_OFFLINE = 1 << 3, MF_UNPOISON = 1 << 4, + MF_MEM_REMOVE = 1 << 5, }; int mf_dax_kill_procs(struct address_space *mapping, pgoff_t index, unsigned long count, int mf_flags);