- mutex_lock(&inode->i_mutex);
-
- err = mnt_want_write(filp->f_path.mnt);
- if (err)
- goto up_no_drop_write;
-
- /*
- * ATTR_VOLUME and ATTR_DIR cannot be changed; this also
- * prevents the user from turning us into a VFAT
- * longname entry. Also, we obviously can't set
- * any of the NTFS attributes in the high 24 bits.
- */
- attr &= 0xff & ~(ATTR_VOLUME | ATTR_DIR);
- /* Merge in ATTR_VOLUME and ATTR_DIR */
- attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
- (is_dir ? ATTR_DIR : 0);
- oldattr = fat_make_attrs(inode);
-
- /* Equivalent to a chmod() */
- ia.ia_valid = ATTR_MODE | ATTR_CTIME;
- ia.ia_ctime = current_fs_time(inode->i_sb);
- if (is_dir)
- ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
- else {
- ia.ia_mode = fat_make_mode(sbi, attr,
- S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
- }
+ if (sbi->options.sys_immutable &&
+ ((attr | oldattr) & ATTR_SYS) &&
+ !capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto out_drop_write;
+ }