From patchwork Fri Dec 30 22:13:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Darrick J. Wong" X-Patchwork-Id: 13084981 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D04B4C3DA7D for ; Fri, 30 Dec 2022 23:53:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235806AbiL3Xxu (ORCPT ); Fri, 30 Dec 2022 18:53:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235736AbiL3Xxt (ORCPT ); Fri, 30 Dec 2022 18:53:49 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 454FA1E3D6; Fri, 30 Dec 2022 15:53:48 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id D627A61B98; Fri, 30 Dec 2022 23:53:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 455D6C433D2; Fri, 30 Dec 2022 23:53:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672444427; bh=AKaVQQmU9fM/WNiMCxkI/eFl5zhqdBthV24kVCilEYc=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=kj0SjqgfuKHSNWH9nfHb20MSEgxo3J1fBsBnVPyNatJqyXA0usxKIF+FHDSpb1mrM t9uE/6uJsKpwyf1IiyA50n6mmBPLjLBKjC99zAHuvp9wT3+5ENGWoNeHiOt4yEnaYD 06+zZeT1IXRTxgKf2SLmTOHYOiNyMXIpyydN0sOwUCQLkRhdQWiqu0S1q0Gfm9NDQV IKLs3x5bHbfUw3F1eO74swLP1pFsh2tEUPXzb+PU5Zs7vuS841MbLM40YsxeyCXat0 x8hlHsxkcRIwbD9oTaLE2r8NOB+XKygjicYXXMuLftCaXCK6VLc4XQcT6KJfFxD7OH eeaJVZ7OKX/Wg== Subject: [PATCH 14/21] xfs: allow xfs_swap_range to use older extent swap algorithms From: "Darrick J. Wong" To: djwong@kernel.org Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org Date: Fri, 30 Dec 2022 14:13:57 -0800 Message-ID: <167243843727.699466.11955722742191147402.stgit@magnolia> In-Reply-To: <167243843494.699466.5163281976943635014.stgit@magnolia> References: <167243843494.699466.5163281976943635014.stgit@magnolia> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Darrick J. Wong If userspace permits non-atomic swap operations, use the older code paths to implement the same functionality. Signed-off-by: Darrick J. Wong --- fs/xfs/xfs_bmap_util.c | 4 +- fs/xfs/xfs_bmap_util.h | 4 ++ fs/xfs/xfs_xchgrange.c | 96 +++++++++++++++++++++++++++++++++++++++++++----- 3 files changed, 92 insertions(+), 12 deletions(-) diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c index 9d6337a05544..e8562c4de7eb 100644 --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -1261,7 +1261,7 @@ xfs_insert_file_space( * reject and log the attempt. basically we are putting the responsibility on * userspace to get this right. */ -static int +int xfs_swap_extents_check_format( struct xfs_inode *ip, /* target inode */ struct xfs_inode *tip) /* tmp inode */ @@ -1403,7 +1403,7 @@ xfs_swap_change_owner( } /* Swap the extents of two files by swapping data forks. */ -STATIC int +int xfs_swap_extent_forks( struct xfs_trans **tpp, struct xfs_swapext_req *req) diff --git a/fs/xfs/xfs_bmap_util.h b/fs/xfs/xfs_bmap_util.h index 6888078f5c31..39c71da08403 100644 --- a/fs/xfs/xfs_bmap_util.h +++ b/fs/xfs/xfs_bmap_util.h @@ -69,6 +69,10 @@ int xfs_free_eofblocks(struct xfs_inode *ip); int xfs_swap_extents(struct xfs_inode *ip, struct xfs_inode *tip, struct xfs_swapext *sx); +struct xfs_swapext_req; +int xfs_swap_extent_forks(struct xfs_trans **tpp, struct xfs_swapext_req *req); +int xfs_swap_extents_check_format(struct xfs_inode *ip, struct xfs_inode *tip); + xfs_daddr_t xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb); xfs_extnum_t xfs_bmap_count_leaves(struct xfs_ifork *ifp, xfs_filblks_t *count); diff --git a/fs/xfs/xfs_xchgrange.c b/fs/xfs/xfs_xchgrange.c index 9966938134c0..2b7aedc49923 100644 --- a/fs/xfs/xfs_xchgrange.c +++ b/fs/xfs/xfs_xchgrange.c @@ -297,6 +297,33 @@ xfs_xchg_range_rele_log_assist( xlog_drop_incompat_feat(mp->m_log, XLOG_INCOMPAT_FEAT_SWAPEXT); } +/* Decide if we can use the old data fork exchange code. */ +static inline bool +xfs_xchg_use_forkswap( + const struct file_xchg_range *fxr, + struct xfs_inode *ip1, + struct xfs_inode *ip2) +{ + if (!(fxr->flags & FILE_XCHG_RANGE_NONATOMIC)) + return false; + if (!(fxr->flags & FILE_XCHG_RANGE_FULL_FILES)) + return false; + if (fxr->flags & FILE_XCHG_RANGE_TO_EOF) + return false; + if (fxr->file1_offset != 0 || fxr->file2_offset != 0) + return false; + if (fxr->length != ip1->i_disk_size) + return false; + if (fxr->length != ip2->i_disk_size) + return false; + return true; +} + +enum xchg_strategy { + SWAPEXT = 1, /* xfs_swapext() */ + FORKSWAP = 2, /* exchange forks */ +}; + /* Exchange the contents of two files. */ int xfs_xchg_range( @@ -316,19 +343,13 @@ xfs_xchg_range( }; struct xfs_trans *tp; unsigned int qretry; + unsigned int flags = 0; bool retried = false; + enum xchg_strategy strategy; int error; trace_xfs_xchg_range(ip1, fxr, ip2, xchg_flags); - /* - * This function only supports using log intent items (SXI items if - * atomic exchange is required, or BUI items if not) to exchange file - * data. The legacy whole-fork swap will be ported in a later patch. - */ - if (!(xchg_flags & XFS_XCHG_RANGE_LOGGED) && !xfs_swapext_supported(mp)) - return -EOPNOTSUPP; - if (fxr->flags & FILE_XCHG_RANGE_TO_EOF) req.req_flags |= XFS_SWAP_REQ_SET_SIZES; if (fxr->flags & FILE_XCHG_RANGE_SKIP_FILE1_HOLES) @@ -340,10 +361,25 @@ xfs_xchg_range( if (error) return error; + /* + * We haven't decided which exchange strategy we want to use yet, but + * here we must choose if we want freed blocks during the swap to be + * added to the transaction block reservation (RES_FDBLKS) or freed + * into the global fdblocks. The legacy fork swap mechanism doesn't + * free any blocks, so it doesn't require it. It is also the only + * option that works for older filesystems. + * + * The bmap log intent items that were added with rmap and reflink can + * change the bmbt shape, so the intent-based swap strategies require + * us to set RES_FDBLKS. + */ + if (xfs_has_lazysbcount(mp)) + flags |= XFS_TRANS_RES_FDBLKS; + retry: /* Allocate the transaction, lock the inodes, and join them. */ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, req.resblks, 0, - XFS_TRANS_RES_FDBLKS, &tp); + flags, &tp); if (error) return error; @@ -386,6 +422,40 @@ xfs_xchg_range( if (error) goto out_trans_cancel; + if ((xchg_flags & XFS_XCHG_RANGE_LOGGED) || xfs_swapext_supported(mp)) { + /* + * xfs_swapext() uses deferred bmap log intent items to swap + * extents between file forks. If the atomic log swap feature + * is enabled, it will also use swapext log intent items to + * restart the operation in case of failure. + * + * This means that we can use it if we previously obtained + * permission from the log to use log-assisted atomic extent + * swapping; or if the fs supports rmap or reflink and the + * user said NONATOMIC. + */ + strategy = SWAPEXT; + } else if (xfs_xchg_use_forkswap(fxr, ip1, ip2)) { + /* + * Exchange the file contents by using the old bmap fork + * exchange code, if we're a defrag tool doing a full file + * swap. + */ + strategy = FORKSWAP; + + error = xfs_swap_extents_check_format(ip2, ip1); + if (error) { + xfs_notice(mp, + "%s: inode 0x%llx format is incompatible for exchanging.", + __func__, ip2->i_ino); + goto out_trans_cancel; + } + } else { + /* We cannot exchange the file contents. */ + error = -EOPNOTSUPP; + goto out_trans_cancel; + } + /* If we got this far on a dry run, all parameters are ok. */ if (fxr->flags & FILE_XCHG_RANGE_DRY_RUN) goto out_trans_cancel; @@ -398,7 +468,13 @@ xfs_xchg_range( xfs_trans_ichgtime(tp, ip2, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); - xfs_swapext(tp, &req); + if (strategy == SWAPEXT) { + xfs_swapext(tp, &req); + } else { + error = xfs_swap_extent_forks(&tp, &req); + if (error) + goto out_trans_cancel; + } /* * Force the log to persist metadata updates if the caller or the