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/* libdiskfs implementation of fs.defs: file_set_size
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"
#include "fs_S.h"
#include <fcntl.h>
/* Implement file_set_size as described in <hurd/fs.defs>. */
kern_return_t
diskfs_S_file_set_size (struct protid *cred,
off_t size)
{
CHANGE_NODE_FIELD (cred,
({
if (!(cred->po->openstat & O_WRITE) || (size < 0))
err = EINVAL;
else if (size < np->dn_stat.st_size)
{
err = diskfs_truncate (np, size);
if (!err && np->filemod_reqs)
diskfs_notice_filechange (np,
FILE_CHANGED_TRUNCATE,
0, size);
}
else if (size > np->dn_stat.st_size)
{
err = diskfs_grow (np, size, cred);
if (! err)
{
np->dn_stat.st_size = size;
np->dn_set_ctime = np->dn_set_mtime = 1;
if (np->filemod_reqs)
diskfs_notice_filechange (np,
FILE_CHANGED_EXTEND,
0, size);
}
}
else
err = 0; /* Setting to same size. */
}));
}
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