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2 pj 1
 
1063 tullio 2
/*
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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2 pj 19
#include <fs/types.h>
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#include <fs/errno.h>
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#include <fs/task.h>
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#include <fs/maccess.h>
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#include <fs/fcntl.h>
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#include "file.h"
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#include "inode.h"
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#include "dentry.h"
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#include "fileop.h"
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#include "dentryop.h"
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#include "inodeop.h"
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#include "fsconst.h"
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#include "fs.h"
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int k_ftruncate(int fd, __off_t len)
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{
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  struct inode *in;
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  int res;
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  __pid_t pid;
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  call_to_fs();
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  /* don't try to use a bad file descriptor */
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  pid=__get_pid();
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  if (check_fd(pid,fd)) {
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    printk(KERN_INFO "k_ftruncate: using bad file descriptor");
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    return_from_fs(-EBADF);
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  }
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  /* don't try to write a directory */
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  if (file_ptr(pid,fd)->f_flag_isdir) return_from_fs(-EBADF);
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  /* if in read only mode (errno OK?)*/
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  if (*fildesfflags_ptr(pid,fd)&O_RDONLY)
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    return_from_fs(-EPERM);
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  /* acquire write lock on inode's file */
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  in=file_ptr(pid,fd)->f_dentry->d_inode;
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  __rwlock_wrlock(&in->i_lock);
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  /*
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  if (*fildesfflags_ptr(pid,fd)&O_APPEND)
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    if (file_ptr(pid,fd)->f_pos!=
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        file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) {
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      __off_t off;
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      off=file_ptr(pid,fd)->f_op->lseek(file_ptr(pid,fd),0,SEEK_END);
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      if (off!=file_ptr(pid,fd)->f_dentry->d_inode->i_st.st_size) {
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        sz=-ESPIPE;
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        goto SKIP;
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      }
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    }
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    */
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  /* truncate */
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  res=in->i_op->truncate(in,len);
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  /* release the lock */
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  __rwlock_wrunlock(&in->i_lock);
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  return_from_fs(res);
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}