static int jfs_open(struct inode *inode, struct file *file)
{
	int rc;

	if ((rc = dquot_file_open(inode, file)))
		return rc;

	/*
	 * We attempt to allow only one "active" file open per aggregate
	 * group.  Otherwise, appending to files in parallel can cause
	 * fragmentation within the files.
	 *
	 * If the file is empty, it was probably just created and going
	 * to be written to.  If it has a size, we'll hold off until the
	 * file is actually grown.
	 */
	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
	    (inode->i_size == 0)) {
		struct jfs_inode_info *ji = JFS_IP(inode);
		spin_lock_irq(&ji->ag_lock);
		if (ji->active_ag == -1) {
			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
			atomic_inc( &jfs_sb->bmap->db_active[ji->active_ag]);
		}
		spin_unlock_irq(&ji->ag_lock);
	}

	return 0;
}

This category addresses vulnerabilities caused by flawed access control mechanisms, where incorrect permission settings allow unauthorized users to access restricted resources.