fs.c

Go to the documentation of this file.

/*
 *    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/ptrace.h>
#include <linux/slab.h>
#include <asm/errno.h>
#include <asm/uaccess.h>

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

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

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

    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 fd arg;
    struct hpux_dirent __user * lastdirent;
    struct getdents_callback buf;
    int error;

    arg = fdget(fd);
    if (!arg.file)
        return -EBADF;

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

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

    fdput(arg);
    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 = from_kuid_munged(current_user_ns(), stat->uid);
    tmp.st_gid = from_kgid_munged(current_user_ns(), 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(const 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(const 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;
}