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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"
/* XXX need to reimplement transnamelen parameter, and implement Roland's
suggestion:
For S_IFMT shorcuts, don't read the device number out of the file!
TRANSNAME should be "ifmt\0minor\0major\0", where IFMT is
_HURD_{CHR,BLK}DEV and MAJOR, MINOR can be parsed with strtol (,,0)
(allowing octal or hex with 0 or 0x). */
/* Implement file_set_translator as described in <hurd/fs.defs>. */
error_t
diskfs_S_file_set_translator (struct protid *cred,
int flags,
int killtrans_flags,
char *transname,
fsys_t existing)
{
struct node *np;
error_t error;
daddr_t blkno;
char blkbuf[sblock->fs_fsize];
if (!cred)
return EOPNOTSUPP;
np = cred->po->np;
mutex_lock (&np->lock);
if (error = isowner (np, cred))
{
mutex_unlock (&np->lock);
return error;
}
if (np->translator)
{
if (flags & FS_TRANS_EXCL)
{
mutex_unlock (&np->lock);
return EBUSY;
}
diskfs_destroy_translator (np, killtrans_flags);
}
if ((flags & FS_TRANS_EXCL) && diskfs_node_translated (np))
{
mutex_unlock (&np->lock);
return EBUSY;
}
/* Handle the short-circuited translators */
if (!(flags & FS_TRANS_FORCE))
{
mode_t newmode = 0;
if (diskfs_shortcut_symlink && !strcmp (transname, _HURD_SYMLINK))
newmode = S_IFLNK;
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)
{
/* Here we need to read the device number from the
contents of the file (which must be S_IFREG). */
char buf[20];
if (S_ISREG (np->dn_stat.st_mode))
{
mutex_unlock (&np->lock);
return EINVAL;
}
error = diskfs_fs_rdwr (np, buf, 0, 20, 0, 0);
if (error)
{
mutex_unlock (&np->lock);
return error;
}
np->dn_stat.st_rdev = atoi (buf);
}
if (newmode != IFLNK)
node_truncate (np, 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, cred);
mutex_unlock (&np->lock);
return error;
}
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