fs: move file_remove_suid() to fs/inode.c

file_remove_suid() is a generic function operates on struct file,
it almost has no relations with file mapping, so move it to fs/inode.c.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 65 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 79c4b2b0b14e..21e5abfbcdf6 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1938,71 +1938,6 @@ struct page *read_cache_page(struct address_space *mapping,
 }
 EXPORT_SYMBOL(read_cache_page);
 
-/*
- * The logic we want is
- *
- *      if suid or (sgid and xgrp)
- *              remove privs
- */
-int should_remove_suid(struct dentry *dentry)
-{
-        umode_t mode = dentry->d_inode->i_mode;
-        int kill = 0;
-
-        /* suid always must be killed */
-        if (unlikely(mode & S_ISUID))
-                kill = ATTR_KILL_SUID;
-
-        /*
-         * sgid without any exec bits is just a mandatory locking mark; leave
-         * it alone.  If some exec bits are set, it's a real sgid; kill it.
-         */
-        if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
-                kill |= ATTR_KILL_SGID;
-
-        if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode)))
-                return kill;
-
-        return 0;
-}
-EXPORT_SYMBOL(should_remove_suid);
-
-static int __remove_suid(struct dentry *dentry, int kill)
-{
-        struct iattr newattrs;
-
-        newattrs.ia_valid = ATTR_FORCE | kill;
-        return notify_change(dentry, &newattrs);
-}
-
-int file_remove_suid(struct file *file)
-{
-        struct dentry *dentry = file->f_path.dentry;
-        struct inode *inode = dentry->d_inode;
-        int killsuid;
-        int killpriv;
-        int error = 0;
-
-        /* Fast path for nothing security related */
-        if (IS_NOSEC(inode))
-                return 0;
-
-        killsuid = should_remove_suid(dentry);
-        killpriv = security_inode_need_killpriv(dentry);
-
-        if (killpriv < 0)
-                return killpriv;
-        if (killpriv)
-                error = security_inode_killpriv(dentry);
-        if (!error && killsuid)
-                error = __remove_suid(dentry, killsuid);
-        if (!error && (inode->i_sb->s_flags & MS_NOSEC))
-                inode->i_flags |= S_NOSEC;
-
-        return error;
-}
-EXPORT_SYMBOL(file_remove_suid);
-
 static size_t __iovec_copy_from_user_inatomic(char *vaddr,
                         const struct iovec *iov, size_t base, size_t bytes)
 {