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 D744B6EB5D; Fri, 1 Mar 2024 13:42:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709300539; cv=none; b=SAZPYPe+gQygm6zrSCcdsstVsRKQg0jA3LnjZ9zkqsYN0PBk6NkRtAq5PaMaiGYXUyAvPdsvrKz540+mJo9TnDWUAge4JynlRVikppIU9u9egRv0fJLm/Uq5M0RMBrnP0UM+DdqYuhz6TGuudOIJ/ZUBM4REjTqw5EJh3PLoBxc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709300539; c=relaxed/simple; bh=WYCGI3NNX9eNDJGvFZeED/W5WzfgdSgqNlTrFqGljRc=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=av5CAgSONm+egaGGw3HFBamWvLlB0YiMENJlo8HdNK55gjuT+7p02vwLC5BjEvC0m8d0ETyRSu/KvlihKcezsfEqyC27iN/Es7jV6cbDw4kLEGYx50SBpHQCF646rHqBJmd8nj6xbKLowHv3QQNv/XsFsCiTmdrF4DtIcXR31mw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=M4tfFWfg; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="M4tfFWfg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 041D4C433F1; Fri, 1 Mar 2024 13:42:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709300539; bh=WYCGI3NNX9eNDJGvFZeED/W5WzfgdSgqNlTrFqGljRc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=M4tfFWfgu6j1tsQLSxnaEs/+UoQELxzhwQ/yHtEmxbOzDheHXFfsDDZql5Wko+l/J XUHmhLetVSz7OvvbNmwREsJ/nYG6tgJHdb/SYgPb1Q6KCIW8eehj+9jQUOl0MZhNdl uzoriczL3Xahq+AOBo6KJm4KiH52+a96pYcWLSGIL58VHAutEJ5eFhD6A8x+PangK7 Bc/hM4L5eOH0FTXDOi50YjasMohsyIAk+WljB9uovoZw7pPbvufwqi6DDM4s4wwPZA B5f5BjyD6KYqTd398GtwmeLXVjRyiXDNhNOMc7iqncZsqVc2xq0u7zcSlcAREL9ikQ DfxP4ol6nCvTg== Message-ID: <726abff82e992e3e0765e8711e90bf0accb37b2a.camel@kernel.org> Subject: Re: [PATCH] xfs: stop advertising SB_I_VERSION From: Jeff Layton To: Dave Chinner , linux-xfs@vger.kernel.org Cc: djwong@kernel.org, linux-fsdevel@vger.kernel.org Date: Fri, 01 Mar 2024 08:42:17 -0500 In-Reply-To: <20240228042859.841623-1-david@fromorbit.com> References: <20240228042859.841623-1-david@fromorbit.com> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; 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 kZWuOsJdJQdmwlWC5L5ln9xgfr/4mOY38B0U= Content-Type: text/plain; charset="ISO-8859-15" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2024-02-28 at 15:28 +1100, Dave Chinner wrote: > From: Dave Chinner >=20 > The redefinition of how NFS wants inode->i_version to be updated is > incomaptible with the XFS i_version mechanism. The VFS now wants > inode->i_version to only change when ctime changes (i.e. it has > become a ctime change counter, not an inode change counter). XFS has > fine grained timestamps, so it can just use ctime for the NFS change > cookie like it still does for V4 XFS filesystems. >=20 Are you saying that XFS has timestamp granularity finer than current_time() reports? I thought XFS used the same clocksource as everyone else. At LPC, you mentioned you had some patches in progress to use the unused bits in the tv_nsec field as a change counter to track changes that occurred within the same timer tick. Did that not pan out for some reason? I'd like to understand why if so. It sounded like a reasonable solution to the problem. >=20 > We still want XFS to update the inode change counter as it currently > does, so convert all the code that checks SB_I_VERSION to check for > v5 format support. Then we can remove the SB_I_VERSION flag from the > VFS superblock to indicate that inode->i_version is not a valid > change counter and should not be used as such. >=20 > Signed-off-by: Dave Chinner > --- > fs/xfs/libxfs/xfs_trans_inode.c | 15 +++++---------- > fs/xfs/xfs_iops.c | 16 +++------------- > fs/xfs/xfs_super.c | 8 -------- > 3 files changed, 8 insertions(+), 31 deletions(-) >=20 > diff --git a/fs/xfs/libxfs/xfs_trans_inode.c b/fs/xfs/libxfs/xfs_trans_in= ode.c > index 70e97ea6eee7..8071aefad728 100644 > --- a/fs/xfs/libxfs/xfs_trans_inode.c > +++ b/fs/xfs/libxfs/xfs_trans_inode.c > @@ -97,17 +97,12 @@ xfs_trans_log_inode( > =20 > /* > * First time we log the inode in a transaction, bump the inode change > - * counter if it is configured for this to occur. While we have the > - * inode locked exclusively for metadata modification, we can usually > - * avoid setting XFS_ILOG_CORE if no one has queried the value since > - * the last time it was incremented. If we have XFS_ILOG_CORE already > - * set however, then go ahead and bump the i_version counter > - * unconditionally. > + * counter if it is configured for this to occur. > */ > - if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags)) { > - if (IS_I_VERSION(inode) && > - inode_maybe_inc_iversion(inode, flags & XFS_ILOG_CORE)) > - flags |=3D XFS_ILOG_IVERSION; > + if (!test_and_set_bit(XFS_LI_DIRTY, &iip->ili_item.li_flags) && > + xfs_has_crc(ip->i_mount)) { > + inode->i_version++; > + flags |=3D XFS_ILOG_IVERSION; > } > =20 > iip->ili_dirty_flags |=3D flags; > diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c > index be102fd49560..97e792d9d79a 100644 > --- a/fs/xfs/xfs_iops.c > +++ b/fs/xfs/xfs_iops.c > @@ -584,11 +584,6 @@ xfs_vn_getattr( > } > } > =20 > - if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) { > - stat->change_cookie =3D inode_query_iversion(inode); > - stat->result_mask |=3D STATX_CHANGE_COOKIE; > - } > - > /* > * Note: If you add another clause to set an attribute flag, please > * update attributes_mask below. > @@ -1044,16 +1039,11 @@ xfs_vn_update_time( > struct timespec64 now; > =20 > trace_xfs_update_time(ip); > + ASSERT(!(flags & S_VERSION)); > =20 > if (inode->i_sb->s_flags & SB_LAZYTIME) { > - if (!((flags & S_VERSION) && > - inode_maybe_inc_iversion(inode, false))) { > - generic_update_time(inode, flags); > - return 0; > - } > - > - /* Capture the iversion update that just occurred */ > - log_flags |=3D XFS_ILOG_CORE; > + generic_update_time(inode, flags); > + return 0; > } > =20 > error =3D xfs_trans_alloc(mp, &M_RES(mp)->tr_fsyncts, 0, 0, 0, &tp); > diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c > index 6ce1e6deb7ec..657ce0423f1d 100644 > --- a/fs/xfs/xfs_super.c > +++ b/fs/xfs/xfs_super.c > @@ -1692,10 +1692,6 @@ xfs_fs_fill_super( > =20 > set_posix_acl_flag(sb); > =20 > - /* version 5 superblocks support inode version counters. */ > - if (xfs_has_crc(mp)) > - sb->s_flags |=3D SB_I_VERSION; > - > if (xfs_has_dax_always(mp)) { > error =3D xfs_setup_dax_always(mp); > if (error) > @@ -1917,10 +1913,6 @@ xfs_fs_reconfigure( > int flags =3D fc->sb_flags; > int error; > =20 > - /* version 5 superblocks always support version counters. */ > - if (xfs_has_crc(mp)) > - fc->sb_flags |=3D SB_I_VERSION; > - > error =3D xfs_fs_validate_params(new_mp); > if (error) > return error; Acked-by: Jeff Layton