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: 13084985 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 A1D58C3DA7C for ; Fri, 30 Dec 2022 23:54:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235818AbiL3Xyw (ORCPT ); Fri, 30 Dec 2022 18:54:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50642 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235819AbiL3Xyv (ORCPT ); Fri, 30 Dec 2022 18:54:51 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 63E8E1E3DE; Fri, 30 Dec 2022 15:54:50 -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 F36A861C55; Fri, 30 Dec 2022 23:54:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5EDBFC433EF; Fri, 30 Dec 2022 23:54:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1672444489; bh=J8c/a8Xy6EPxYjsODvsxgmlH0Y5nZNdU7B5T9VqmxJQ=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=jlYnV4t3nOEUJnWmn+BMi0pgTn2+njS6b5gFp/Y2oSvhgiOItdgtuRKW9utgbrVpy iTtSrA4H6hodCQjwNeyKwikB9BNpNn7axokIYz1fIgcwcyDS6+stoohuCz3+q9p4h/ bqwqFR0mknP/iaVMUR2YiJXkBePGfgSliFUsqBfYIhTBFlYSV+3XS1eGnllPn/kFHt YlOwr9yAqRv62WxEytddXDPlEe7YUgCzu9piywTw1CqfKpU30RbDQBlnbL9HAKvC2+ HDuc2UNhz0+repYSlU7xw8zPiRWpJHiynyc5aXEGicxtUwwECZt9O3kns1xick07Y1 ybsy9FoFxfJrA== Subject: [PATCH 18/21] xfs: condense symbolic links after an atomic swap 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: <167243843786.699466.11515465917822251289.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 The previous commit added a new swapext flag that enables us to perform post-swap processing on file2 once we're done swapping the extent maps. Now add this ability for symlinks. This isn't used anywhere right now, but we need to have the basic ondisk flags in place so that a future online symlink repair feature can salvage the remote target in a temporary link and swap the data forks when ready. If one file is in extents format and the other is inline, we will have to promote both to extents format to perform the swap. After the swap, we can try to condense the fixed symlink down to inline format if possible. Signed-off-by: Darrick J. Wong --- fs/xfs/libxfs/xfs_swapext.c | 48 +++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_symlink_remote.c | 47 +++++++++++++++++++++++++++++++++++ fs/xfs/libxfs/xfs_symlink_remote.h | 1 + fs/xfs/xfs_symlink.c | 49 ++++-------------------------------- 4 files changed, 101 insertions(+), 44 deletions(-) diff --git a/fs/xfs/libxfs/xfs_swapext.c b/fs/xfs/libxfs/xfs_swapext.c index a52f72a499f4..b27ceeb93a16 100644 --- a/fs/xfs/libxfs/xfs_swapext.c +++ b/fs/xfs/libxfs/xfs_swapext.c @@ -29,6 +29,7 @@ #include "xfs_attr.h" #include "xfs_dir2_priv.h" #include "xfs_dir2.h" +#include "xfs_symlink_remote.h" struct kmem_cache *xfs_swapext_intent_cache; @@ -423,6 +424,48 @@ xfs_swapext_dir_to_sf( return xfs_dir2_block_to_sf(&args, bp, size, &sfh); } +/* Convert inode2's remote symlink target back to shortform, if possible. */ +STATIC int +xfs_swapext_link_to_sf( + struct xfs_trans *tp, + struct xfs_swapext_intent *sxi) +{ + struct xfs_inode *ip = sxi->sxi_ip2; + struct xfs_ifork *ifp = xfs_ifork_ptr(ip, XFS_DATA_FORK); + char *buf; + int error; + + if (ifp->if_format == XFS_DINODE_FMT_LOCAL || + ip->i_disk_size > xfs_inode_data_fork_size(ip)) + return 0; + + /* Read the current symlink target into a buffer. */ + buf = kmem_alloc(ip->i_disk_size + 1, KM_NOFS); + if (!buf) { + ASSERT(0); + return -ENOMEM; + } + + error = xfs_symlink_remote_read(ip, buf); + if (error) + goto free; + + /* Remove the blocks. */ + error = xfs_symlink_remote_truncate(tp, ip); + if (error) + goto free; + + /* Convert fork to local format and log our changes. */ + xfs_idestroy_fork(ifp); + ifp->if_bytes = 0; + ifp->if_format = XFS_DINODE_FMT_LOCAL; + xfs_init_local_fork(ip, XFS_DATA_FORK, buf, ip->i_disk_size); + xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE); +free: + kmem_free(buf); + return error; +} + static inline void xfs_swapext_clear_reflink( struct xfs_trans *tp, @@ -447,6 +490,8 @@ xfs_swapext_do_postop_work( error = xfs_swapext_attr_to_sf(tp, sxi); else if (S_ISDIR(VFS_I(sxi->sxi_ip2)->i_mode)) error = xfs_swapext_dir_to_sf(tp, sxi); + else if (S_ISLNK(VFS_I(sxi->sxi_ip2)->i_mode)) + error = xfs_swapext_link_to_sf(tp, sxi); sxi->sxi_flags &= ~XFS_SWAP_EXT_CVT_INO2_SF; if (error) return error; @@ -1103,7 +1148,8 @@ xfs_swapext( if (req->req_flags & XFS_SWAP_REQ_CVT_INO2_SF) ASSERT(req->whichfork == XFS_ATTR_FORK || (req->whichfork == XFS_DATA_FORK && - S_ISDIR(VFS_I(req->ip2)->i_mode))); + (S_ISDIR(VFS_I(req->ip2)->i_mode) || + S_ISLNK(VFS_I(req->ip2)->i_mode)))); if (req->blockcount == 0) return; diff --git a/fs/xfs/libxfs/xfs_symlink_remote.c b/fs/xfs/libxfs/xfs_symlink_remote.c index 5261f15ea2ed..b48dcb893a2a 100644 --- a/fs/xfs/libxfs/xfs_symlink_remote.c +++ b/fs/xfs/libxfs/xfs_symlink_remote.c @@ -391,3 +391,50 @@ xfs_symlink_write_target( ASSERT(pathlen == 0); return 0; } + +/* Remove all the blocks from a symlink and invalidate buffers. */ +int +xfs_symlink_remote_truncate( + struct xfs_trans *tp, + struct xfs_inode *ip) +{ + struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS]; + struct xfs_mount *mp = tp->t_mountp; + struct xfs_buf *bp; + int nmaps = XFS_SYMLINK_MAPS; + int done = 0; + int i; + int error; + + /* Read mappings and invalidate buffers. */ + error = xfs_bmapi_read(ip, 0, XFS_MAX_FILEOFF, mval, &nmaps, 0); + if (error) + return error; + + for (i = 0; i < nmaps; i++) { + if (!xfs_bmap_is_real_extent(&mval[i])) + break; + + error = xfs_trans_get_buf(tp, mp->m_ddev_targp, + XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), + XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0, + &bp); + if (error) + return error; + + xfs_trans_binval(tp, bp); + } + + /* Unmap the remote blocks. */ + error = xfs_bunmapi(tp, ip, 0, XFS_MAX_FILEOFF, 0, nmaps, &done); + if (error) + return error; + if (!done) { + ASSERT(done); + xfs_inode_mark_sick(ip, XFS_SICK_INO_SYMLINK); + return -EFSCORRUPTED; + } + + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); + return 0; +} diff --git a/fs/xfs/libxfs/xfs_symlink_remote.h b/fs/xfs/libxfs/xfs_symlink_remote.h index d81461c06b6b..05eb9c3937d9 100644 --- a/fs/xfs/libxfs/xfs_symlink_remote.h +++ b/fs/xfs/libxfs/xfs_symlink_remote.h @@ -23,5 +23,6 @@ int xfs_symlink_remote_read(struct xfs_inode *ip, char *link); int xfs_symlink_write_target(struct xfs_trans *tp, struct xfs_inode *ip, const char *target_path, int pathlen, xfs_fsblock_t fs_blocks, uint resblks); +int xfs_symlink_remote_truncate(struct xfs_trans *tp, struct xfs_inode *ip); #endif /* __XFS_SYMLINK_REMOTE_H */ diff --git a/fs/xfs/xfs_symlink.c b/fs/xfs/xfs_symlink.c index 548d9116e0c5..8cf69ca4bd7c 100644 --- a/fs/xfs/xfs_symlink.c +++ b/fs/xfs/xfs_symlink.c @@ -250,19 +250,12 @@ xfs_symlink( */ STATIC int xfs_inactive_symlink_rmt( - struct xfs_inode *ip) + struct xfs_inode *ip) { - struct xfs_buf *bp; - int done; - int error; - int i; - xfs_mount_t *mp; - xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS]; - int nmaps; - int size; - xfs_trans_t *tp; + struct xfs_mount *mp = ip->i_mount; + struct xfs_trans *tp; + int error; - mp = ip->i_mount; ASSERT(!xfs_need_iread_extents(&ip->i_df)); /* * We're freeing a symlink that has some @@ -286,44 +279,14 @@ xfs_inactive_symlink_rmt( * locked for the second transaction. In the error paths we need it * held so the cancel won't rele it, see below. */ - size = (int)ip->i_disk_size; ip->i_disk_size = 0; VFS_I(ip)->i_mode = (VFS_I(ip)->i_mode & ~S_IFMT) | S_IFREG; xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); - /* - * Find the block(s) so we can inval and unmap them. - */ - done = 0; - nmaps = ARRAY_SIZE(mval); - error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size), - mval, &nmaps, 0); - if (error) - goto error_trans_cancel; - /* - * Invalidate the block(s). No validation is done. - */ - for (i = 0; i < nmaps; i++) { - error = xfs_trans_get_buf(tp, mp->m_ddev_targp, - XFS_FSB_TO_DADDR(mp, mval[i].br_startblock), - XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0, - &bp); - if (error) - goto error_trans_cancel; - xfs_trans_binval(tp, bp); - } - /* - * Unmap the dead block(s) to the dfops. - */ - error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done); + + error = xfs_symlink_remote_truncate(tp, ip); if (error) goto error_trans_cancel; - ASSERT(done); - /* - * Commit the transaction. This first logs the EFI and the inode, then - * rolls and commits the transaction that frees the extents. - */ - xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); error = xfs_trans_commit(tp); if (error) { ASSERT(xfs_is_shutdown(mp));