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/*
Copyright (C) 1993, 1994, 1995, 1996 Free Software Foundation
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. */
/* Written by Michael I. Bushnell. */
#include "priv.h"
#include "fsys_S.h"
#include <hurd/fsys.h>
#include <fcntl.h>
/* Implement fsys_getroot as described in <hurd/fsys.defs>. */
kern_return_t
diskfs_S_fsys_getroot (fsys_t controlport,
mach_port_t reply,
mach_msg_type_name_t replytype,
mach_port_t dotdot,
uid_t *uids,
u_int nuids,
uid_t *gids,
u_int ngids,
int flags,
retry_type *retry,
char *retryname,
file_t *returned_port,
mach_msg_type_name_t *returned_port_poly)
{
struct port_info *pt = ports_lookup_port (diskfs_port_bucket, controlport,
diskfs_control_class);
error_t error = 0;
mode_t type;
struct protid pseudocred;
struct protid *newpi;
if (!pt)
return EOPNOTSUPP;
flags &= O_HURD;
rwlock_reader_lock (&diskfs_fsys_lock);
mutex_lock (&diskfs_root_node->lock);
/* This code is similar (but not the same as) the code in
dir-pathtrans.c that does the same thing. Perhaps a way should
be found to share the logic. */
type = diskfs_root_node->dn_stat.st_mode & S_IFMT;
if ((diskfs_root_node->istranslated
|| fshelp_translated (&diskfs_root_node->transbox))
&& !(flags & O_NOTRANS))
{
error = fshelp_fetch_root (&diskfs_root_node->transbox,
&dotdot, dotdot, uids, nuids,
gids, ngids, flags,
_diskfs_translator_callback1,
_diskfs_translator_callback2,
retry, retryname, returned_port);
if (error != ENOENT)
{
mutex_unlock (&diskfs_root_node->lock);
rwlock_reader_unlock (&diskfs_fsys_lock);
if (!error)
*returned_port_poly = MACH_MSG_TYPE_MOVE_SEND;
return error;
}
/* ENOENT means the translator was removed in the interim. */
error = 0;
}
if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
{
/* Handle symlink interpretation */
char pathbuf[diskfs_root_node->dn_stat.st_size + 1];
int amt;
if (diskfs_read_symlink_hook)
error = (*diskfs_read_symlink_hook) (diskfs_root_node, pathbuf);
if (!diskfs_read_symlink_hook || error == EINVAL)
error = diskfs_node_rdwr (diskfs_root_node, pathbuf, 0,
diskfs_root_node->dn_stat.st_size, 0,
0, &amt);
pathbuf[amt] = '\0';
mutex_unlock (&diskfs_root_node->lock);
rwlock_reader_unlock (&diskfs_fsys_lock);
if (error)
return error;
if (pathbuf[0] == '/')
{
*retry = FS_RETRY_MAGICAL;
*returned_port = MACH_PORT_NULL;
*returned_port_poly = MACH_MSG_TYPE_COPY_SEND;
strcpy (retryname, pathbuf);
mach_port_deallocate (mach_task_self (), dotdot);
return 0;
}
else
{
*retry = FS_RETRY_REAUTH;
*returned_port = dotdot;
*returned_port_poly = MACH_MSG_TYPE_MOVE_SEND;
strcpy (retryname, pathbuf);
return 0;
}
}
if ((type == S_IFSOCK || type == S_IFBLK
|| type == S_IFCHR || type == S_IFIFO)
&& (flags & (O_READ|O_WRITE|O_EXEC)))
error = EOPNOTSUPP;
/* diskfs_access requires a cred; so we give it one. */
pseudocred.uids = uids;
pseudocred.gids = gids;
pseudocred.nuids = nuids;
pseudocred.ngids = ngids;
if (!error && (flags & O_READ))
error = diskfs_access (diskfs_root_node, S_IREAD, &pseudocred);
if (!error && (flags & O_EXEC))
error = diskfs_access (diskfs_root_node, S_IEXEC, &pseudocred);
if (!error && (flags & (O_WRITE)))
{
if (type == S_IFDIR)
error = EISDIR;
else if (diskfs_readonly)
error = EROFS;
else
error = diskfs_access (diskfs_root_node, S_IWRITE, &pseudocred);
}
if (error)
{
mutex_unlock (&diskfs_root_node->lock);
rwlock_reader_unlock (&diskfs_fsys_lock);
return error;
}
if ((flags & O_NOATIME)
&& (diskfs_isowner (diskfs_root_node, &pseudocred) == EPERM))
flags &= ~O_NOATIME;
flags &= ~OPENONLY_STATE_MODES;
error = diskfs_create_protid (diskfs_make_peropen (diskfs_root_node,
flags, dotdot),
uids, nuids, gids, ngids, &newpi);
mach_port_deallocate (mach_task_self (), dotdot);
if (! error)
{
*retry = FS_RETRY_NORMAL;
*retryname = '\0';
*returned_port = ports_get_right (newpi);
*returned_port_poly = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (newpi);
}
mutex_unlock (&diskfs_root_node->lock);
rwlock_reader_unlock (&diskfs_fsys_lock);
ports_port_deref (pt);
return error;
}
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