This is a note to let you know that I've just added the patch titled xfs: always swap the cow forks when swapping extents to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xfs-always-swap-the-cow-forks-when-swapping-extents.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 52bfcdd7adbc26639bc7b2356ab9a3f5dad68ad6 Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx> Date: Mon, 18 Sep 2017 09:41:18 -0700 Subject: xfs: always swap the cow forks when swapping extents From: Darrick J. Wong <darrick.wong@xxxxxxxxxx> commit 52bfcdd7adbc26639bc7b2356ab9a3f5dad68ad6 upstream. Since the CoW fork exists as a secondary data structure to the data fork, we must always swap cow forks during swapext. We also need to swap the extent counts and reset the cowblocks tags. Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/xfs/xfs_bmap_util.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) --- a/fs/xfs/xfs_bmap_util.c +++ b/fs/xfs/xfs_bmap_util.c @@ -2106,11 +2106,31 @@ xfs_swap_extents( ip->i_d.di_flags2 |= tip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK; tip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK; tip->i_d.di_flags2 |= f & XFS_DIFLAG2_REFLINK; + } + + /* Swap the cow forks. */ + if (xfs_sb_version_hasreflink(&mp->m_sb)) { + xfs_extnum_t extnum; + + ASSERT(ip->i_cformat == XFS_DINODE_FMT_EXTENTS); + ASSERT(tip->i_cformat == XFS_DINODE_FMT_EXTENTS); + + extnum = ip->i_cnextents; + ip->i_cnextents = tip->i_cnextents; + tip->i_cnextents = extnum; + cowfp = ip->i_cowfp; ip->i_cowfp = tip->i_cowfp; tip->i_cowfp = cowfp; - xfs_inode_set_cowblocks_tag(ip); - xfs_inode_set_cowblocks_tag(tip); + + if (ip->i_cowfp && ip->i_cnextents) + xfs_inode_set_cowblocks_tag(ip); + else + xfs_inode_clear_cowblocks_tag(ip); + if (tip->i_cowfp && tip->i_cnextents) + xfs_inode_set_cowblocks_tag(tip); + else + xfs_inode_clear_cowblocks_tag(tip); } xfs_trans_log_inode(tp, ip, src_log_flags); Patches currently in stable-queue which might be from darrick.wong@xxxxxxxxxx are queue-4.9/xfs-don-t-unconditionally-clear-the-reflink-flag-on-zero-block-files.patch queue-4.9/xfs-cancel-dirty-pages-on-invalidation.patch queue-4.9/xfs-reinit-btree-pointer-on-attr-tree-inactivation-walk.patch queue-4.9/xfs-report-zeroed-or-not-correctly-in-xfs_zero_range.patch queue-4.9/xfs-move-more-rt-specific-code-under-config_xfs_rt.patch queue-4.9/xfs-don-t-change-inode-mode-if-acl-update-fails.patch queue-4.9/xfs-handle-error-if-xfs_btree_get_bufs-fails.patch queue-4.9/xfs-update-i_size-after-unwritten-conversion-in-dio-completion.patch queue-4.9/xfs-trim-writepage-mapping-to-within-eof.patch queue-4.9/xfs-handle-racy-aio-in-xfs_reflink_end_cow.patch queue-4.9/xfs-evict-cow-fork-extents-when-performing-finsert-fcollapse.patch queue-4.9/xfs-capture-state-of-the-right-inode-in-xfs_iflush_done.patch queue-4.9/fs-xfs-use-ps-printk-format-for-direct-addresses.patch queue-4.9/xfs-perag-initialization-should-only-touch-m_ag_max_usable-for-ag-0.patch queue-4.9/xfs-always-swap-the-cow-forks-when-swapping-extents.patch queue-4.9/xfs-don-t-log-uninitialised-fields-in-inode-structures.patch