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/*
* 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <fs/types.h>
#include <fs/errno.h>
#include <fs/task.h>
#include <fs/maccess.h>
#include <fs/fcntl.h>
#include "file.h"
#include "inode.h"
#include "dentry.h"
#include "fileop.h"
#include "dentryop.h"
#include "inodeop.h"
#include "fsconst.h"
#include "fs.h"
int k_ftruncate(int fd, __off_t len)
{
struct inode *in;
int res;
__pid_t pid;
call_to_fs();
/* don't try to use a bad file descriptor */
pid=__get_pid();
if (check_fd(pid,fd)) {
printk(KERN_INFO "k_ftruncate: using bad file descriptor");
return_from_fs(-EBADF);
}
/* don't try to write a directory */
if (file_ptr(pid,fd)->f_flag_isdir) return_from_fs(-EBADF);
/* if in read only mode (errno OK?)*/
if (*fildesfflags_ptr(pid,fd)&O_RDONLY)
return_from_fs(-EPERM);
/* acquire write lock on inode's file */
in=file_ptr(pid,fd)->f_dentry->d_inode;
__rwlock_wrlock(&in->i_lock);
/*
if (*fildesfflags_ptr(pid,fd)&O_APPEND)
if (file_ptr(pid,fd)->f_pos!=
file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) {
__off_t off;
off=file_ptr(pid,fd)->f_op->lseek(file_ptr(pid,fd),0,SEEK_END);
if (off!=file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) {
sz=-ESPIPE;
goto SKIP;
}
}
*/
/* truncate */
res=in->i_op->truncate(in,len);
/* release the lock */
__rwlock_wrunlock(&in->i_lock);
return_from_fs(res);
}