1942 long do_mount(char *dev_name, char *dir_name, char *type_page,
1943 unsigned long flags, void *data_page)
1944 {
1945 struct path path;
1946 int retval = 0;
1947 int mnt_flags = 0;
1948
1949 /* Discard magic */
1950 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
1951 flags &= ~MS_MGC_MSK;
1952
1953 /* Basic sanity checks */
1954
1955 if (!dir_name || !*dir_name || !memchr(dir_name, 0, PAGE_SIZE))
1956 return -EINVAL;
1957
1958 if (data_page)
1959 ((char *)data_page)[PAGE_SIZE - 1] = 0;
1960
1961 /* ... and get the mountpoint */
1962 retval = kern_path(dir_name, LOOKUP_FOLLOW, &path);
1963 if (retval)
1964 return retval;
1965
1966 retval = security_sb_mount(dev_name, &path,
1967 type_page, flags, data_page);
1968 if (retval)
1969 goto dput_out;
1970
1971 /* Default to relatime unless overriden */
1972 if (!(flags & MS_NOATIME))
1973 mnt_flags |= MNT_RELATIME;
1974
1975 /* Separate the per-mountpoint flags */
1976 if (flags & MS_NOSUID)
1977 mnt_flags |= MNT_NOSUID;
1978 if (flags & MS_NODEV)
1979 mnt_flags |= MNT_NODEV;
1980 if (flags & MS_NOEXEC)
1981 mnt_flags |= MNT_NOEXEC;
1982 if (flags & MS_NOATIME)
1983 mnt_flags |= MNT_NOATIME;
1984 if (flags & MS_NODIRATIME)
1985 mnt_flags |= MNT_NODIRATIME;
1986 if (flags & MS_STRICTATIME)
1987 mnt_flags &= ~(MNT_RELATIME | MNT_NOATIME);
1988 if (flags & MS_RDONLY)
1989 mnt_flags |= MNT_READONLY;
1990
1991 flags &= ~(MS_NOSUID | MS_NOEXEC | MS_NODEV | MS_ACTIVE | MS_BORN |
1992 MS_NOATIME | MS_NODIRATIME | MS_RELATIME| MS_KERNMOUNT |
1993 MS_STRICTATIME);
1994
1995 if (flags & MS_REMOUNT)
1996 retval = do_remount(&path, flags & ~MS_REMOUNT, mnt_flags,
1997 data_page);
1998 else if (flags & MS_BIND)
1999 retval = do_loopback(&path, dev_name, flags & MS_REC);
2000 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE))
2001 retval = do_change_type(&path, flags);
2002 else if (flags & MS_MOVE)
2003 retval = do_move_mount(&path, dev_name);
2004 else
2005 retval = do_new_mount(&path, type_page, flags, mnt_flags,
2006 dev_name, data_page);
2007 dput_out:
2008 path_put(&path);
2009 return retval;
2010 }
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