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This is where XFS' specific read/write path will live and is started.

/*
 *  fs/xfs/linux/xfs_lrw.c (Linux Read Write stuff)
 *
 */
#define FSID_T
#include <sys/types.h>
#include <linux/errno.h>
#include "xfs_coda_oops.h"

#include <linux/xfs_to_linux.h>

#undef  NODEV
#include <linux/version.h>
#include <linux/fs.h>
#include <linux/page_buf.h>
#include <linux/linux_to_xfs.h>

#include "xfs_buf.h"
#include <ksys/behavior.h>
#include <sys/vnode.h>
#include <sys/uuid.h>
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_itable.h"
#include "xfs_btree.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_error.h"
#include "xfs_bit.h"
#include "xfs_trans_space.h"

ssize_t
xfs_rdwr(
	bhv_desc_t      *bdp,
	struct file	*filp,
	char 		*buf,
	size_t		size,
	loff_t		*offsetp,
	int		read)	/* set if read, otherwise this is write */
{
	ssize_t ret;
	struct xfs_inode *xip;

	printk("ENTER xfs_rdwr %x %d %d\n", (unsigned int)filp, size, read);

	xip = XFS_BHVTOI(bdp);
	if (XFS_FORCED_SHUTDOWN(xip->i_mount)) {
		ret = -EIO;
		goto out;
	}

	ret = 0;
	if (size == 0) {
		goto out;
	}

	if (read) {
		ret = pagebuf_generic_file_read(filp, buf, size, offsetp);
	} else {
		/* last zero eof */
		ret = pagebuf_generic_file_write(filp, buf, size, offsetp);
	}
out:
	printk("EXIT xfs_rdwr %d %d %X\n", read, ret, *offsetp);
	return(ret);
}

ssize_t
xfs_read(
	bhv_desc_t      *bdp,
	struct file	*filp,
	char 		*buf,
	size_t		size,
	loff_t		*offsetp)
{
	return(xfs_rdwr(bdp, filp, buf, size, offsetp, 1));
}

ssize_t
xfs_write(
	bhv_desc_t      *bdp,
	struct file	*filp,
	char		*buf,
	size_t		size,
	loff_t		*offsetp)
{
	return(xfs_rdwr(bdp, filp, buf, size, offsetp, 0));
}