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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> 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 X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: wjfq7zxxpyeukuzzf8w9zr875fx1ordd X-Rspamd-Queue-Id: 6948A180010 X-HE-Tag: 1675522753-881557 X-HE-Meta: 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 /SJS/65z PGT3Xc9E5EYzpYfczK++KCq3H9rnfnTUxTqVhbJ5bwndqSv4MjO0AJmA3CyV5DlpPGIyiAtgaIv6XRDuof5opH+0Uwmsw4eFzyAOcw/+AsGLgR844kx3lEAZ3kbckMBybVmnrtuudHJnJDCwBjPFZ6i4WkThGhIsBBxDkTrqsUTCT0HgNeQr4+Y2ZNILfc/gLtatP6XyOkpP939r4EeDq0MMlQuWLXAd2Jue1JGZxD5G26qgktIEsz5oIQ6Sr21ts0dwRQou3TB2TQoyf8jm7kRj460F18UcGYf9RidbsNCwGy1en3TrYT82rT7aq0YYkuO0WYwvFBi2xDdNJmBfarJ5FaSLqdYhnCMyc4RkO/xDgUUwXAGv/f63vxQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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);