path: root/fs/coda/upcall.c

/*
 * Mostly platform independent upcall operations to Venus:
 *  -- upcalls
 *  -- upcall routines
 *
 * Linux 2.0 version
 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk>, 
 * Michael Callahan <callahan@maths.ox.ac.uk> 
 * 
 * Redone for Linux 2.1
 * Copyright (C) 1997 Carnegie Mellon University
 *
 * Carnegie Mellon University encourages users of this code to contribute
 * improvements to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
 */

#include <asm/system.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <asm/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/vfs.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_psdev.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_cache.h>

#include "coda_int.h"

static int coda_upcall(struct venus_comm *vc, int inSize, int *outSize,
		       union inputArgs *buffer);

static void *alloc_upcall(int opcode, int size)
{
	union inputArgs *inp;

	CODA_ALLOC(inp, union inputArgs *, size);
        if (!inp)
		return ERR_PTR(-ENOMEM);

        inp->ih.opcode = opcode;
	inp->ih.pid = current->pid;
	inp->ih.pgid = task_pgrp_nr(current);
	inp->ih.uid = current->fsuid;

	return (void*)inp;
}

#define UPARG(op)\
do {\
	inp = (union inputArgs *)alloc_upcall(op, insize); \
        if (IS_ERR(inp)) { return PTR_ERR(inp); }\
        outp = (union outputArgs *)(inp); \
        outsize = insize; \
} while (0)

#define INSIZE(tag) sizeof(struct coda_ ## tag ## _in)
#define OUTSIZE(tag) sizeof(struct coda_ ## tag ## _out)
#define SIZE(tag)  max_t(unsigned int, INSIZE(tag), OUTSIZE(tag))


/* the upcalls */
int venus_rootfid(struct super_block *sb, struct CodaFid *fidp)
{
        union inputArgs *inp;
        union outputArgs *outp;
        int insize, outsize, error;

        insize = SIZE(root);
        UPARG(CODA_ROOT);

	error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
	if (!error)
		*fidp = outp->coda_root.VFid;

	CODA_FREE(inp, insize);
	return error;
}

int venus_getattr(struct super_block *sb, struct CodaFid *fid, 
		     struct coda_vattr *attr) 
{
        union inputArgs *inp;
        union outputArgs *outp;
        int insize, outsize, error;

        insize = SIZE(getattr); 
	UPARG(CODA_GETATTR);
        inp->coda_getattr.VFid = *fid;

	error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
	if (!error)
		*attr = outp->coda_getattr.attr;

	CODA_FREE(inp, insize);
        return error;
}

int venus_setattr(struct super_block *sb, struct CodaFid *fid, 
		  struct coda_vattr *vattr)
{
        union inputArgs *inp;
        union outputArgs *outp;
        int insize, outsize, error;
	
	insize = SIZE(setattr);
	UPARG(CODA_SETATTR);

        inp->coda_setattr.VFid = *fid;
	inp->coda_setattr.attr = *vattr;

	error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);

        CODA_FREE(inp, insize);
        return error;
}

int venus_lookup(struct super_block *sb, struct CodaFid *fid, 
		    const char *name, int length, int * type, 
		    struct CodaFid *resfid)
{
        union inputArgs *inp;
        union outputArgs *outp;
        int insize, outsize, error;
	int offset;

	offset = INSIZE(lookup);
        insize = max_t(unsigned int, offset + length +1, OUTSIZE(lookup));
	UPARG(CODA_LOOKUP);

        inp->coda_lookup.VFid = *fid;
	inp->coda_lookup.name = offset;
	inp->coda_lookup.flags = CLU_CASE_SENSITIVE;
        /* send Venus a null terminated string */
        memcpy((char *)(inp) + offset, name, length);
        *((char *)inp + offset + length) = '\0';

	error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
	if (!error) {
		*resfid = outp->coda_lookup.VFid;
		*type = outp->coda_lookup.vtype;
	}

	CODA_FREE(inp, insize);
	return error;
}

int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
		vuid_t uid)
{
	union inputArgs *inp;
	union outputArgs *outp;
	int insize, outsize, error;
	
	insize = SIZE(release);
	UPARG(CODA_CLOSE);
	
	inp->ih.uid = uid;
        inp->coda_close.VFid = *fid;
        inp->coda_close.flags = flags;

	error = coda_upcall(coda_vcp(sb), insize, &outsize,