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/* libdiskfs implementation of fs.defs: file_chmod
Copyright (C) 1992, 1993, 1994, 1995 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"
/* Implement file_chmod as described in <hurd/fs.defs>. */
error_t
diskfs_S_file_chmod (struct protid *cred,
mode_t mode)
{
struct userid *id;
mode &= ~(S_IFMT | S_ISPARE);
CHANGE_NODE_FIELD (cred,
({
if (!(err = diskfs_isowner (np, cred)))
{
/* Run through each ID in the chain
to see if it is allowed to do the operations
requested. Turn off bits as we find
that they are prohibited. */
assert (cred->id);
for (id = cred->id; id; id = id->next)
{
if (!_diskfs_idhasuid (0, id))
{
if (!S_ISDIR (np->dn_stat.st_mode))
mode &= ~S_ISVTX;
if (!diskfs_idhasgid (np->dn_stat.st_gid, id))
mode &= ~S_ISGID;
if (!diskfs_idhasuid (np->dn_stat.st_uid, id))
mode &= ~S_ISUID;
}
}
mode |= (np->dn_stat.st_mode & (S_IFMT | S_ISPARE));
np->dn_stat.st_mode = mode;
np->dn_set_ctime = 1;
}
}));
}
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