vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link}

New field of struct super_block - ->s_max_links.  Maximal allowed
value of ->i_nlink or 0; in the latter case all checks still need
to be done in ->link/->mkdir/->rename instances.  Note that this
limit applies both to directoris and to non-directories.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 11 deletions

diff --git a/fs/xfs/xfs_rename.c b/fs/xfs/xfs_rename.c
index 866de277079a..e44ef7ee8ce8 100644
--- a/fs/xfs/xfs_rename.c
+++ b/fs/xfs/xfs_rename.c
@@ -118,17 +118,6 @@ xfs_rename(
         new_parent = (src_dp != target_dp);
         src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
 
-        if (src_is_directory) {
-                /*
-                 * Check for link count overflow on target_dp
-                 */
-                if (target_ip == NULL && new_parent &&
-                    target_dp->i_d.di_nlink >= XFS_MAXLINK) {
-                        error = XFS_ERROR(EMLINK);
-                        goto std_return;
-                }
-        }
-
         xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
                                 inodes, &num_inodes);