From patchwork Tue Aug 13 07:39:42 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13761473 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 32A3158ABF for ; Tue, 13 Aug 2024 07:40:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723534832; cv=none; b=KEnlInoz1Hls0eD/rJf5mv2E2xvzuUHm36wcPxe5hHb7gVLdBGfW0MTlgXTv/RutGfh8ldnh9Ivv5aDkvj96HGw2qnUZBhUd3AXfEFpGRoIkRWA0e4+vViP0QHG1H6IZ5hqxTnC06W9tFPVZYYeWnV7S4IrDg0IsWhhkhDhui28= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723534832; c=relaxed/simple; bh=IgNnX77TruHwlPbFmP1sNDl8aysBjNoJhPkOU8utgvY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=r8coHVpMlc0iYfguRXy8SVYxa5iX10zSrv8UheiOftI7Sam5QqBLRMeQLNVsyUblFaLsS46FDk6o18P59FF2hP7JzRkdji/1IP4uPsPhI+RksN2ua83gem6kLVPhIRQ/2x48i9FEHw6ylOfrkJCQwAm0qbEqm4U6rXEEiAmvNA8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=odXXh8dR; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="odXXh8dR" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=t/6itKJSb5fga8/5T/Vx3R+vP2lP+c0eRJ48C4ZfaMg=; b=odXXh8dRiyDtM51ixyPWB9w1u4 HU65mFGDI6mtw8XeuxRQIw6AMNpibKvgQniMoA/Pu6zg/9JbMnoydyXItuZVLoITMp7qiXSB7/+Ks 8U4vK2SDWWg0w8T+8Pc7YGAniBwHwUNSWImNpkrHh/NIZM+4iaaj76Y/1vby3Gtkc5WwuRKX7cfJf KvgWf+z58F3wfhlM0AjlkdLP50ZQbI5jtTF07ZfPv/oebwU72mN4fQHwPKYi0//Yjm1sVx5ZQnCb1 a7EUgDVmXAYH5b8tl/itH/citZyg3KoSE1x2+5NwwVgNhQIvWWdvIUbu6MMmaPGhz3GsopGZrgqcb FX0Y77ew==; Received: from 2a02-8389-2341-5b80-d764-33aa-2f69-5c44.cable.dynamic.v6.surfer.at ([2a02:8389:2341:5b80:d764:33aa:2f69:5c44] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sdm8s-00000002lDw-0ze8; Tue, 13 Aug 2024 07:40:30 +0000 From: Christoph Hellwig To: Chandan Babu R Cc: "Darrick J. Wong" , Dave Chinner , linux-xfs@vger.kernel.org Subject: [PATCH 9/9] xfs: reclaim speculative preallocations for append only files Date: Tue, 13 Aug 2024 09:39:42 +0200 Message-ID: <20240813073952.81360-10-hch@lst.de> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240813073952.81360-1-hch@lst.de> References: <20240813073952.81360-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html The XFS XFS_DIFLAG_APPEND maps to the VFS S_APPEND flag, which forbids writes that don't append at the current EOF. But the commit originally adding XFS_DIFLAG_APPEND support (commit a23321e766d in xfs xfs-import repository) also checked it to skip releasing speculative preallocations, which doesn't make any sense. Another commit (dd9f438e3290 in the xfs-import repository) later extended that flag to also report these speculation preallocations which should not exist in getbmap. Remove these checks as nothing XFS_DIFLAG_APPEND implies that preallocations beyond EOF should exist, but explicitly check for XFS_DIFLAG_APPEND in xfs_file_release to bypass the algorithm that discard preallocations on the first close as append only files aren't expected to be written to only once. Signed-off-by: Christoph Hellwig Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_bmap_util.c | 12 +++++------- fs/xfs/xfs_file.c | 4 ++++ fs/xfs/xfs_icache.c | 2 +- 3 files changed, 10 insertions(+), 8 deletions(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 9c42cfb62cf2dc..0f1e3289255c2e 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -331,8 +331,7 @@ xfs_getbmap( } if (xfs_get_extsz_hint(ip) || - (ip->i_diflags & - (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))) + (ip->i_diflags & XFS_DIFLAG_PREALLOC)) max_len = mp->m_super->s_maxbytes; else max_len = XFS_ISIZE(ip); @@ -524,12 +523,11 @@ xfs_can_free_eofblocks( return false; /* - * Only free real extents for inodes with persistent preallocations or - * the append-only flag. + * Do not free real extents in preallocated files unless the file has + * delalloc blocks and we are forced to remove them. */ - if (ip->i_diflags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND)) - if (ip->i_delayed_blks == 0) - return false; + if ((ip->i_diflags & XFS_DIFLAG_PREALLOC) && !ip->i_delayed_blks) + return false; /* * Do not try to free post-EOF blocks if EOF is beyond the end of the diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 986448d1ff3c0c..0d258c21b9897f 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -1220,6 +1220,9 @@ xfs_file_release( * one file after another without going back to it while keeping the * preallocation for files that have recurring open/write/close cycles. * + * This heuristic is skipped for inodes with the append-only flag as + * that flag is rather pointless for inodes written only once. + * * There is no point in freeing blocks here for open but unlinked files * as they will be taken care of by the inactivation path soon. * @@ -1234,6 +1237,7 @@ xfs_file_release( */ if (inode->i_nlink && (file->f_mode & FMODE_WRITE) && + !(ip->i_diflags & XFS_DIFLAG_APPEND) && !xfs_iflags_test(ip, XFS_EOFBLOCKS_RELEASED) && xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) { if (xfs_can_free_eofblocks(ip) && diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c index cf629302d48e74..e995e2f6152dbd 100644 --- a/fs/xfs/xfs_icache.c +++ b/fs/xfs/xfs_icache.c @@ -1159,7 +1159,7 @@ xfs_inode_free_eofblocks( if (xfs_can_free_eofblocks(ip)) return xfs_free_eofblocks(ip); - /* inode could be preallocated or append-only */ + /* inode could be preallocated */ trace_xfs_inode_free_eofblocks_invalid(ip); xfs_inode_clear_eofblocks_tag(ip); return 0;