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/* libdiskfs implementation of fs.defs: file_set_translator
Copyright (C) 1992, 1993, 1994 Free Software Foundation
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "priv.h"
#include "fs_S.h"
#include <hurd/paths.h>
/* Implement file_set_translator as described in <hurd/fs.defs>. */
kern_return_t
diskfs_S_file_set_translator (struct protid *cred,
int flags,
int killtrans_flags,
char *transname,
u_int transnamelen,
fsys_t existing)
{
struct node *np;
error_t error;
if (!cred)
return EOPNOTSUPP;
if (!transnamelen && existing == MACH_PORT_NULL)
return 0;
np = cred->po->np;
if (transnamelen && transname[transnamelen - 1])
return EINVAL;
mutex_lock (&np->lock);
if (error = diskfs_isowner (np, cred))
{
mutex_unlock (&np->lock);
return error;
}
if (np->translator.control != MACH_PORT_NULL)
{
if (flags & FS_TRANS_EXCL)
{
mutex_unlock (&np->lock);
return EBUSY;
}
diskfs_destroy_translator (np, killtrans_flags);
}
if ((flags & FS_TRANS_EXCL) && transname && diskfs_node_translated (np))
{
mutex_unlock (&np->lock);
return EBUSY;
}
if (transnamelen)
{
if (!(flags & FS_TRANS_FORCE))
{
/* Handle the short-circuited translators */
mode_t newmode = 0;
if (diskfs_shortcut_symlink && !strcmp (transname, _HURD_SYMLINK))
newmode = S_IFLNK;
if (diskfs_shortcut_chrdev && !(strcmp (transname, _HURD_CHRDEV)))
newmode = S_IFCHR;
else if (diskfs_shortcut_blkdev && !strcmp (transname, _HURD_BLKDEV))
newmode = S_IFBLK;
else if (diskfs_shortcut_fifo && !strcmp (transname, _HURD_FIFO))
newmode = S_IFIFO;
else if (diskfs_shortcut_ifsock && !strcmp (transname, _HURD_IFSOCK))
newmode = S_IFSOCK;
if (newmode)
{
if (S_ISDIR (np->dn_stat.st_mode))
{
/* We can't allow this, because if the mode of the directory
changes, the links will be lost. Perhaps it might be
allowed for empty directories, but that's too much of a
pain. */
mutex_unlock (&np->lock);
return EISDIR;
}
if (newmode == S_IFBLK || newmode == S_IFCHR)
{
/* Find the device number from the arguments
of the translator. */
int major, minor;
char *arg;
arg = transname + strlen (transname) + 1;
assert (arg <= transname + transnamelen);
if (arg == transname + transnamelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
major = strtol (arg, 0, 0);
arg = arg + strlen (arg) + 1;
assert (arg < transname + transnamelen);
if (arg == transname + transnamelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
minor = strtol (arg, 0, 0);
np->dn_stat.st_rdev = (((major & 0x377) << 8)
| (minor & 0x377));
}
diskfs_truncate (np, 0);
if (newmode == S_IFLNK)
{
char *arg = transname + strlen (transname) + 1;
assert (arg <= transname + transnamelen);
if (arg == transname + transnamelen)
{
mutex_unlock (&np->lock);
return EINVAL;
}
/* Store the argument in the file as the
target of the link */
diskfs_node_rdwr (np, arg, 0, strlen (arg), 1, cred, 0);
}
np->dn_stat.st_mode = (np->dn_stat.st_mode & ~S_IFMT) | newmode;
diskfs_node_update (np, 1);
mutex_unlock (&np->lock);
return 0;
}
}
error = diskfs_set_translator (np, transname, transnamelen, cred);
}
if (existing != MACH_PORT_NULL)
fshelp_set_control (&np->translator, existing);
mutex_unlock (&np->lock);
return error;
}
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