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/nilfs2/namei.c b/fs/nilfs2/namei.c
index 1cd3f624dffc..fce2bbee66d4 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -193,9 +193,6 @@ static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
         struct nilfs_transaction_info ti;
         int err;
 
-        if (inode->i_nlink >= NILFS_LINK_MAX)
-                return -EMLINK;
-
         err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
         if (err)
                 return err;
@@ -219,9 +216,6 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
         struct nilfs_transaction_info ti;
         int err;
 
-        if (dir->i_nlink >= NILFS_LINK_MAX)
-                return -EMLINK;
-
         err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
         if (err)
                 return err;
@@ -400,11 +394,6 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                 drop_nlink(new_inode);
                 nilfs_mark_inode_dirty(new_inode);
         } else {
-                if (dir_de) {
-                        err = -EMLINK;
-                        if (new_dir->i_nlink >= NILFS_LINK_MAX)
-                                goto out_dir;
-                }
                 err = nilfs_add_link(new_dentry, old_inode);
                 if (err)
                         goto out_dir;