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Sourcecode: linux version File versions

fs.c

/*
 *    Implements HPUX syscalls.
 *
 *    Copyright (C) 1999 Matthew Wilcox <willy with parisc-linux.org>
 *    Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
 *    Copyright (C) 2000 John Marvin <jsm with parisc-linux.org>
 *    Copyright (C) 2000 Philipp Rumpf
 *
 *    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 <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/sched.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/ptrace.h>
#include <asm/errno.h>
#include <asm/uaccess.h>

int hpux_execve(struct pt_regs *regs)
{
      int error;
      char *filename;

      filename = getname((char __user *) regs->gr[26]);
      error = PTR_ERR(filename);
      if (IS_ERR(filename))
            goto out;

      error = do_execve(filename, (char __user * __user *) regs->gr[25],
            (char __user * __user *) regs->gr[24], regs);

      if (error == 0) {
            task_lock(current);
            current->ptrace &= ~PT_DTRACE;
            task_unlock(current);
      }
      putname(filename);

out:
      return error;
}

struct hpux_dirent {
      loff_t      d_off;
      ino_t d_ino;
      short d_reclen;
      short d_namlen;
      char  d_name[1];
};

struct getdents_callback {
      struct hpux_dirent __user *current_dir;
      struct hpux_dirent __user *previous;
      int count;
      int error;
};

#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))

static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
            u64 ino, unsigned d_type)
{
      struct hpux_dirent __user * dirent;
      struct getdents_callback * buf = (struct getdents_callback *) __buf;
      ino_t d_ino;
      int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(long));

      buf->error = -EINVAL;   /* only used if we fail.. */
      if (reclen > buf->count)
            return -EINVAL;
      d_ino = ino;
      if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
            buf->error = -EOVERFLOW;
            return -EOVERFLOW;
      }
      dirent = buf->previous;
      if (dirent)
            if (put_user(offset, &dirent->d_off))
                  goto Efault;
      dirent = buf->current_dir;
      if (put_user(d_ino, &dirent->d_ino) ||
          put_user(reclen, &dirent->d_reclen) ||
          put_user(namlen, &dirent->d_namlen) ||
          copy_to_user(dirent->d_name, name, namlen) ||
          put_user(0, dirent->d_name + namlen))
            goto Efault;
      buf->previous = dirent;
      buf->current_dir = (void __user *)dirent + reclen;
      buf->count -= reclen;
      return 0;
Efault:
      buf->error = -EFAULT;
      return -EFAULT;
}

#undef NAME_OFFSET

int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned int count)
{
      struct file * file;
      struct hpux_dirent __user * lastdirent;
      struct getdents_callback buf;
      int error = -EBADF;

      file = fget(fd);
      if (!file)
            goto out;

      buf.current_dir = dirent;
      buf.previous = NULL;
      buf.count = count;
      buf.error = 0;

      error = vfs_readdir(file, filldir, &buf);
      if (error < 0)
            goto out_putf;
      error = buf.error;
      lastdirent = buf.previous;
      if (lastdirent) {
            if (put_user(file->f_pos, &lastdirent->d_off))
                  error = -EFAULT;
            else
                  error = count - buf.count;
      }

out_putf:
      fput(file);
out:
      return error;
}

int hpux_mount(const char *fs, const char *path, int mflag,
            const char *fstype, const char *dataptr, int datalen)
{
      return -ENOSYS;
}

static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
{
      struct hpux_stat64 tmp;

      /* we probably want a different split here - is hpux 12:20? */

      if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
            return -EOVERFLOW;

      memset(&tmp, 0, sizeof(tmp));
      tmp.st_dev = new_encode_dev(stat->dev);
      tmp.st_ino = stat->ino;
      tmp.st_mode = stat->mode;
      tmp.st_nlink = stat->nlink;
      tmp.st_uid = stat->uid;
      tmp.st_gid = stat->gid;
      tmp.st_rdev = new_encode_dev(stat->rdev);
      tmp.st_size = stat->size;
      tmp.st_atime = stat->atime.tv_sec;
      tmp.st_mtime = stat->mtime.tv_sec;
      tmp.st_ctime = stat->ctime.tv_sec;
      tmp.st_blocks = stat->blocks;
      tmp.st_blksize = stat->blksize;
      return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

long hpux_stat64(char __user *filename, struct hpux_stat64 __user *statbuf)
{
      struct kstat stat;
      int error = vfs_stat(filename, &stat);

      if (!error)
            error = cp_hpux_stat(&stat, statbuf);

      return error;
}

long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
{
      struct kstat stat;
      int error = vfs_fstat(fd, &stat);

      if (!error)
            error = cp_hpux_stat(&stat, statbuf);

      return error;
}

long hpux_lstat64(char __user *filename, struct hpux_stat64 __user *statbuf)
{
      struct kstat stat;
      int error = vfs_lstat(filename, &stat);

      if (!error)
            error = cp_hpux_stat(&stat, statbuf);

      return error;
}

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