finding xfs_mount_t for specified device

[Soon-Son Kwon <kss@xxxxxxxx>]

Hi, I managed to make a very *primative* function 
that finds xfs_mount_t structure for a specified
device(e.g. /dev/hda2) from scratch but it does not 
work as I expected.

If anyone please take a look at my code and let me 
know where to modify, I'd appreciate it very much.


Thanks very much.
---
int xfssnap_findmp(const char *devname, xfs_mount_t *mp)
{
        int             fd, size;
        struct file     *file;
        struct inode    *inode;

        bhv_desc_t      *bdp;
        vn_bhv_head_t   *bhp;
        vnode_t         *vp; 
        xfs_inode_t     *ip;

        xfs_attr_multiop_t      *ops;
        xfs_fsop_attrmulti_handlereq_t  *am_hreq;

        size = sizeof(xfs_fsop_attrmulti_handlereq_t);
        am_hreq = (xfs_fsop_attrmulti_handlereq_t *)kmalloc(size, GFP_KERNEL);

        fd = open(devname, O_RDONLY, 0);
        file = fget(fd);
        inode = file->f_dentry->d_inode;
 
        vp = LINVFS_GET_VP(inode);
        bhp = VN_BHV_HEAD(vp);
        size = am_hreq->opcount * sizeof(attr_multiop_t);
        ops = (xfs_attr_multiop_t *)kmalloc(size, GFP_KERNEL);
        if(!ops)
        {
                VN_RELE(vp);
                return -XFS_ERROR(ENOMEM);
        }

        bdp = bhv_lookup(bhp, ops);

        vn_trace_entry(vp, "xfs_ioctl", (inst_t *)__return_address);

        ip = XFS_BHVTOI(bdp);
        mp = ip->i_mount;

        printk("xfssnap_findmp executed\n");

        kfree(am_hreq);
        kfree(ops);
        return 0;
}
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