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 E82451D523 for ; Wed, 4 Oct 2023 18:04:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8172C433C8; Wed, 4 Oct 2023 18:04:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696442693; bh=XXNHbmjh2NXf+mNDpSYVuBCl85e+MLhdHlMh4eieQ5w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gl4foDF8tvDks9z3PD9uhHPfEygBySMmLZ78q95pdKhbC+5Jhb/35wpgH6yCeutPa RiOZmh+1W+bvONhP6lPoZ4mLVjuxC0MC6CMhnnVDfARMkGtiMwQxPvqPzZUkZlhw+t r4dKgpxUIMQKc5tTxaxs7IpOkSAO8eFUgFdS+edg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Darrick J. Wong" , Dave Chinner , Dave Chinner , Leah Rumancik , Sasha Levin Subject: [PATCH 5.15 076/183] xfs: disable reaping in fscounters scrub Date: Wed, 4 Oct 2023 19:55:07 +0200 Message-ID: <20231004175207.054978919@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175203.943277832@linuxfoundation.org> References: <20231004175203.943277832@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Darrick J. Wong [ Upstream commit 2d5f38a31980d7090f5bf91021488dc61a0ba8ee ] The fscounters scrub code doesn't work properly because it cannot quiesce updates to the percpu counters in the filesystem, hence it returns false corruption reports. This has been fixed properly in one of the online repair patchsets that are under review by replacing the xchk_disable_reaping calls with an exclusive filesystem freeze. Disabling background gc isn't sufficient to fix the problem. In other words, scrub doesn't need to call xfs_inodegc_stop, which is just as well since it wasn't correct to allow scrub to call xfs_inodegc_start when something else could be calling xfs_inodegc_stop (e.g. trying to freeze the filesystem). Neuter the scrubber for now, and remove the xchk_*_reaping functions. Signed-off-by: Darrick J. Wong Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner Signed-off-by: Leah Rumancik Acked-by: Darrick J. Wong Signed-off-by: Sasha Levin --- fs/xfs/scrub/common.c | 25 ------------------------- fs/xfs/scrub/common.h | 2 -- fs/xfs/scrub/fscounters.c | 13 ++++++------- fs/xfs/scrub/scrub.c | 2 -- fs/xfs/scrub/scrub.h | 1 - 5 files changed, 6 insertions(+), 37 deletions(-) diff --git a/fs/xfs/scrub/common.c b/fs/xfs/scrub/common.c index bf1f3607d0b60..08df23edea720 100644 --- a/fs/xfs/scrub/common.c +++ b/fs/xfs/scrub/common.c @@ -864,28 +864,3 @@ xchk_ilock_inverted( return -EDEADLOCK; } -/* Pause background reaping of resources. */ -void -xchk_stop_reaping( - struct xfs_scrub *sc) -{ - sc->flags |= XCHK_REAPING_DISABLED; - xfs_blockgc_stop(sc->mp); - xfs_inodegc_stop(sc->mp); -} - -/* Restart background reaping of resources. */ -void -xchk_start_reaping( - struct xfs_scrub *sc) -{ - /* - * Readonly filesystems do not perform inactivation or speculative - * preallocation, so there's no need to restart the workers. - */ - if (!xfs_is_readonly(sc->mp)) { - xfs_inodegc_start(sc->mp); - xfs_blockgc_start(sc->mp); - } - sc->flags &= ~XCHK_REAPING_DISABLED; -} diff --git a/fs/xfs/scrub/common.h b/fs/xfs/scrub/common.h index 454145db10e71..2ca80102e704a 100644 --- a/fs/xfs/scrub/common.h +++ b/fs/xfs/scrub/common.h @@ -148,7 +148,5 @@ static inline bool xchk_skip_xref(struct xfs_scrub_metadata *sm) int xchk_metadata_inode_forks(struct xfs_scrub *sc); int xchk_ilock_inverted(struct xfs_inode *ip, uint lock_mode); -void xchk_stop_reaping(struct xfs_scrub *sc); -void xchk_start_reaping(struct xfs_scrub *sc); #endif /* __XFS_SCRUB_COMMON_H__ */ diff --git a/fs/xfs/scrub/fscounters.c b/fs/xfs/scrub/fscounters.c index 48a6cbdf95d08..037541339d80a 100644 --- a/fs/xfs/scrub/fscounters.c +++ b/fs/xfs/scrub/fscounters.c @@ -128,13 +128,6 @@ xchk_setup_fscounters( if (error) return error; - /* - * Pause background reclaim while we're scrubbing to reduce the - * likelihood of background perturbations to the counters throwing off - * our calculations. - */ - xchk_stop_reaping(sc); - return xchk_trans_alloc(sc, 0); } @@ -353,6 +346,12 @@ xchk_fscounters( if (fdblocks > mp->m_sb.sb_dblocks) xchk_set_corrupt(sc); + /* + * XXX: We can't quiesce percpu counter updates, so exit early. + * This can be re-enabled when we gain exclusive freeze functionality. + */ + return 0; + /* * If ifree exceeds icount by more than the minimum variance then * something's probably wrong with the counters. diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c index 51e4c61916d20..e4d2a41983f73 100644 --- a/fs/xfs/scrub/scrub.c +++ b/fs/xfs/scrub/scrub.c @@ -171,8 +171,6 @@ xchk_teardown( } if (sc->sm->sm_flags & XFS_SCRUB_IFLAG_REPAIR) mnt_drop_write_file(sc->file); - if (sc->flags & XCHK_REAPING_DISABLED) - xchk_start_reaping(sc); if (sc->flags & XCHK_HAS_QUOTAOFFLOCK) { mutex_unlock(&sc->mp->m_quotainfo->qi_quotaofflock); sc->flags &= ~XCHK_HAS_QUOTAOFFLOCK; diff --git a/fs/xfs/scrub/scrub.h b/fs/xfs/scrub/scrub.h index 80e5026bba44a..e8d9fe9de26ed 100644 --- a/fs/xfs/scrub/scrub.h +++ b/fs/xfs/scrub/scrub.h @@ -89,7 +89,6 @@ struct xfs_scrub { /* XCHK state flags grow up from zero, XREP state flags grown down from 2^31 */ #define XCHK_TRY_HARDER (1 << 0) /* can't get resources, try again */ #define XCHK_HAS_QUOTAOFFLOCK (1 << 1) /* we hold the quotaoff lock */ -#define XCHK_REAPING_DISABLED (1 << 2) /* background block reaping paused */ #define XREP_ALREADY_FIXED (1 << 31) /* checking our repair work */ /* Metadata scrubbers */ -- 2.40.1