1 files changed, 100 insertions, 0 deletions
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 475de8f919be..2fd22db528b1 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3606,3 +3606,103 @@ xfs_iunlock2_io_mmap(
 	if (ip1 != ip2)
 		inode_unlock(VFS_I(ip1));
 }
+
+/*
+ * Reload the incore inode list for this inode.  Caller should ensure that
+ * the link count cannot change, either by taking ILOCK_SHARED or otherwise
+ * preventing other threads from executing.
+ */
+int
+xfs_inode_reload_unlinked_bucket(
+	struct xfs_trans	*tp,
+	struct xfs_inode	*ip)
+{
+	struct xfs_mount	*mp = tp->t_mountp;
+	struct xfs_buf		*agibp;
+	struct xfs_agi		*agi;
+	struct xfs_perag	*pag;
+	xfs_agnumber_t		agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
+	xfs_agino_t		agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
+	xfs_agino_t		prev_agino, next_agino;
+	unsigned int		bucket;
+	bool			foundit = false;
+	int			error;
+
+	/* Grab the first inode in the list */
+	pag = xfs_perag_get(mp, agno);
+	error = xfs_ialloc_read_agi(pag, tp, &agibp);
+	xfs_perag_put(pag);
+	if (error)
+		return error;
+
+	bucket = agino % XFS_AGI_UNLINKED_BUCKETS;
+	agi = agibp->b_addr;
+
+	trace_xfs_inode_reload_unlinked_bucket(ip);
+
+	xfs_info_ratelimited(mp,
+ "Found unrecovered unlinked inode 0x%x in AG 0x%x.  Initiating list recovery.",
+			agino, agno);
+
+	prev_agino = NULLAGINO;
+	next_agino = be32_to_cpu(agi->agi_unlinked[bucket]);
+	while (next_agino != NULLAGINO) {
+		struct xfs_inode	*next_ip = NULL;
+
+		if (next_agino == agino) {
+			/* Found this inode, set its backlink. */
+			next_ip = ip;
+			next_ip->i_prev_unlinked = prev_agino;
+			foundit = true;
+		}
+		if (!next_ip) {
+			/* Inode already in memory. */
+			next_ip = xfs_iunlink_lookup(pag, next_agino);
+		}
+		if (!next_ip) {
+			/* Inode not in memory, reload. */
+			error = xfs_iunlink_reload_next(tp, agibp, prev_agino,
+					next_agino);
+			if (error)
+				break;
+
+			next_ip = xfs_iunlink_lookup(pag, next_agino);
+		}
+		if (!next_ip) {
+			/* No incore inode at all?  We reloaded it... */
+			ASSERT(next_ip != NULL);
+			error = -EFSCORRUPTED;
+			break;
+		}
+
+		prev_agino = next_agino;
+		next_agino = next_ip->i_next_unlinked;
+	}
+
+	xfs_trans_brelse(tp, agibp);
+	/* Should have found this inode somewhere in the iunlinked bucket. */
+	if (!error && !foundit)
+		error = -EFSCORRUPTED;
+	return error;
+}
+
+/* Decide if this inode is missing its unlinked list and reload it. */
+int
+xfs_inode_reload_unlinked(
+	struct xfs_inode	*ip)
+{
+	struct xfs_trans	*tp;
+	int			error;
+
+	error = xfs_trans_alloc_empty(ip->i_mount, &tp);
+	if (error)
+		return error;
+
+	xfs_ilock(ip, XFS_ILOCK_SHARED);
+	if (xfs_inode_unlinked_incomplete(ip))
+		error = xfs_inode_reload_unlinked_bucket(tp, ip);
+	xfs_iunlock(ip, XFS_ILOCK_SHARED);
+	xfs_trans_cancel(tp);
+
+	return error;
+}