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/* Return the file for a given handle (for nfs server support)
Copyright (C) 1997,99,2001,02 Free Software Foundation, Inc.
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <fcntl.h>
#include "priv.h"
#include "fsys_S.h"
#include "fhandle.h"
/* Return in FILE & FILE_TYPE the file in FSYS corresponding to the NFS file
handle HANDLE & HANDLE_LEN. */
error_t
diskfs_S_fsys_getfile (mach_port_t fsys,
mach_port_t reply, mach_msg_type_name_t reply_type,
uid_t *uids, mach_msg_type_number_t nuids,
gid_t *gids, mach_msg_type_number_t ngids,
char *handle, mach_msg_type_number_t handle_len,
mach_port_t *file, mach_msg_type_name_t *file_type)
{
int flags;
error_t err;
struct node *node;
const union diskfs_fhandle *f;
struct protid *new_cred;
struct peropen *new_po;
struct iouser *user;
struct port_info *pt =
ports_lookup_port (diskfs_port_bucket, fsys, diskfs_control_class);
if (!pt)
return EOPNOTSUPP;
if (handle_len != sizeof *f)
{
ports_port_deref (pt);
return EINVAL;
}
f = (const union diskfs_fhandle *) handle;
err = diskfs_cached_lookup (f->data.cache_id, &node);
if (err)
{
ports_port_deref (pt);
return err;
}
if (node->dn_stat.st_gen != f->data.gen)
{
diskfs_nput (node);
ports_port_deref (pt);
return ESTALE;
}
err = iohelp_create_complex_iouser (&user, uids, nuids, gids, ngids);
if (err)
{
diskfs_nput (node);
ports_port_deref (pt);
return err;
}
flags = 0;
if (! fshelp_access (&node->dn_stat, S_IREAD, user))
flags |= O_READ;
if (! fshelp_access (&node->dn_stat, S_IEXEC, user))
flags |= O_EXEC;
if (! fshelp_access (&node->dn_stat, S_IWRITE, user)
&& ! S_ISDIR (node->dn_stat.st_mode)
&& ! diskfs_check_readonly ())
flags |= O_WRITE;
err = diskfs_make_peropen (node, flags, 0, &new_po);
if (! err)
{
err = diskfs_create_protid (new_po, user, &new_cred);
if (err)
diskfs_release_peropen (new_po);
}
iohelp_free_iouser (user);
diskfs_nput (node);
ports_port_deref (pt);
if (! err)
{
*file = ports_get_right (new_cred);
*file_type = MACH_MSG_TYPE_MAKE_SEND;
}
return err;
}
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