[PATCH] xfs: do not log/recover swapext extent owner changes for deleted inodes

[Eric Sandeen <sandeen@redhat.com>]

Today if we run swapext and crash, log replay can fail because
the recovery code tries to instantiate the donor inode from
disk to replay the swapext, but it's been deleted and we throw
corruption failures if we try to get an inode off disk with
i_mode == 0.

This fixes both sides: We don't log the swapext change if the
inode has been deleted, and we don't try to recover it either.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 26f2413..de48eb8 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -436,6 +436,12 @@ xfs_inode_item_format(
 			~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 	}
 
+	/* If this inode has been deleted do not log swapext owner changes */
+	if (VFS_I(ip)->i_mode == 0) {
+		ilf->ilf_fields &= ~(XFS_ILOG_DOWNER | XFS_ILOG_AOWNER);
+		iip->ili_fields &= ~(XFS_ILOG_DOWNER | XFS_ILOG_AOWNER);
+	}
+
 	/* update the format with the exact fields we actually logged */
 	ilf->ilf_fields |= (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
 }
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 5e219d9..d0e33b9 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -3199,7 +3199,9 @@ xlog_recover_inode_pass2(
 	}
 
 out_owner_change:
-	if (in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER))
+	/* Recover the swapext owner change unless inode has been deleted */
+	if ((in_f->ilf_fields & (XFS_ILOG_DOWNER|XFS_ILOG_AOWNER)) &&
+	    (dip->di_mode != 0))
 		error = xfs_recover_inode_owner_change(mp, dip, in_f,
 						       buffer_list);
 	/* re-generate the checksum. */