136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/*
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* linux/fs/compat.c
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*
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* Kernel compatibililty routines for e.g. 32 bit syscall support
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* on 64 bit kernels.
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*
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* Copyright (C) 2002 Stephen Rothwell, IBM Corporation
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* Copyright (C) 1997-2000 Jakub Jelinek (jakub@redhat.com)
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* Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be)
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* Copyright (C) 2001,2002 Andi Kleen, SuSE Labs
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* Copyright (C) 2003 Pavel Machek (pavel@ucw.cz)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/compat.h>
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#include <linux/nfs4_mount.h>
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#include <linux/syscalls.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "internal.h"
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struct compat_nfs_string {
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compat_uint_t len;
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compat_uptr_t data;
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};
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static inline void compat_nfs_string(struct nfs_string *dst,
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struct compat_nfs_string *src)
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{
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dst->data = compat_ptr(src->data);
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dst->len = src->len;
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}
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struct compat_nfs4_mount_data_v1 {
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compat_int_t version;
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compat_int_t flags;
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compat_int_t rsize;
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compat_int_t wsize;
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compat_int_t timeo;
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compat_int_t retrans;
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compat_int_t acregmin;
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compat_int_t acregmax;
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compat_int_t acdirmin;
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compat_int_t acdirmax;
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struct compat_nfs_string client_addr;
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struct compat_nfs_string mnt_path;
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struct compat_nfs_string hostname;
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compat_uint_t host_addrlen;
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compat_uptr_t host_addr;
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compat_int_t proto;
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compat_int_t auth_flavourlen;
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compat_uptr_t auth_flavours;
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};
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static int do_nfs4_super_data_conv(void *raw_data)
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{
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int version = *(compat_uint_t *) raw_data;
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if (version == 1) {
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struct compat_nfs4_mount_data_v1 *raw = raw_data;
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struct nfs4_mount_data *real = raw_data;
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/* copy the fields backwards */
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real->auth_flavours = compat_ptr(raw->auth_flavours);
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real->auth_flavourlen = raw->auth_flavourlen;
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real->proto = raw->proto;
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real->host_addr = compat_ptr(raw->host_addr);
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real->host_addrlen = raw->host_addrlen;
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compat_nfs_string(&real->hostname, &raw->hostname);
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compat_nfs_string(&real->mnt_path, &raw->mnt_path);
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compat_nfs_string(&real->client_addr, &raw->client_addr);
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real->acdirmax = raw->acdirmax;
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real->acdirmin = raw->acdirmin;
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real->acregmax = raw->acregmax;
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real->acregmin = raw->acregmin;
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real->retrans = raw->retrans;
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real->timeo = raw->timeo;
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real->wsize = raw->wsize;
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real->rsize = raw->rsize;
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real->flags = raw->flags;
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real->version = raw->version;
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}
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return 0;
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}
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#define NFS4_NAME "nfs4"
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COMPAT_SYSCALL_DEFINE5(mount, const char __user *, dev_name,
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const char __user *, dir_name,
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const char __user *, type, compat_ulong_t, flags,
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const void __user *, data)
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{
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char *kernel_type;
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void *options;
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char *kernel_dev;
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int retval;
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kernel_type = copy_mount_string(type);
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retval = PTR_ERR(kernel_type);
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if (IS_ERR(kernel_type))
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goto out;
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kernel_dev = copy_mount_string(dev_name);
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retval = PTR_ERR(kernel_dev);
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if (IS_ERR(kernel_dev))
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goto out1;
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options = copy_mount_options(data);
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retval = PTR_ERR(options);
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if (IS_ERR(options))
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goto out2;
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if (kernel_type && options) {
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if (!strcmp(kernel_type, NFS4_NAME)) {
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retval = -EINVAL;
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if (do_nfs4_super_data_conv(options))
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goto out3;
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}
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}
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retval = do_mount(kernel_dev, dir_name, kernel_type, flags, options);
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out3:
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kfree(options);
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out2:
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kfree(kernel_dev);
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out1:
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kfree(kernel_type);
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out:
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return retval;
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}
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