linux/arch/parisc/hpux/fs.c
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   1/*
   2 *    Implements HPUX syscalls.
   3 *
   4 *    Copyright (C) 1999 Matthew Wilcox <willy with parisc-linux.org>
   5 *    Copyright (C) 2000 Michael Ang <mang with subcarrier.org>
   6 *    Copyright (C) 2000 John Marvin <jsm with parisc-linux.org>
   7 *    Copyright (C) 2000 Philipp Rumpf
   8 *
   9 *    This program is free software; you can redistribute it and/or modify
  10 *    it under the terms of the GNU General Public License as published by
  11 *    the Free Software Foundation; either version 2 of the License, or
  12 *    (at your option) any later version.
  13 *
  14 *    This program is distributed in the hope that it will be useful,
  15 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 *    GNU General Public License for more details.
  18 *
  19 *    You should have received a copy of the GNU General Public License
  20 *    along with this program; if not, write to the Free Software
  21 *    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 */
  23
  24#include <linux/kernel.h>
  25#include <linux/mm.h>
  26#include <linux/fs.h>
  27#include <linux/sched.h>
  28#include <linux/file.h>
  29#include <linux/ptrace.h>
  30#include <linux/slab.h>
  31#include <asm/errno.h>
  32#include <asm/uaccess.h>
  33
  34int hpux_execve(struct pt_regs *regs)
  35{
  36        int error;
  37        struct filename *filename;
  38
  39        filename = getname((const char __user *) regs->gr[26]);
  40        error = PTR_ERR(filename);
  41        if (IS_ERR(filename))
  42                goto out;
  43
  44        error = do_execve(filename->name,
  45                          (const char __user *const __user *) regs->gr[25],
  46                          (const char __user *const __user *) regs->gr[24]);
  47
  48        putname(filename);
  49
  50out:
  51        return error;
  52}
  53
  54struct hpux_dirent {
  55        loff_t  d_off;
  56        ino_t   d_ino;
  57        short   d_reclen;
  58        short   d_namlen;
  59        char    d_name[1];
  60};
  61
  62struct getdents_callback {
  63        struct hpux_dirent __user *current_dir;
  64        struct hpux_dirent __user *previous;
  65        int count;
  66        int error;
  67};
  68
  69#define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  70
  71static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
  72                u64 ino, unsigned d_type)
  73{
  74        struct hpux_dirent __user * dirent;
  75        struct getdents_callback * buf = (struct getdents_callback *) __buf;
  76        ino_t d_ino;
  77        int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(long));
  78
  79        buf->error = -EINVAL;   /* only used if we fail.. */
  80        if (reclen > buf->count)
  81                return -EINVAL;
  82        d_ino = ino;
  83        if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
  84                buf->error = -EOVERFLOW;
  85                return -EOVERFLOW;
  86        }
  87        dirent = buf->previous;
  88        if (dirent)
  89                if (put_user(offset, &dirent->d_off))
  90                        goto Efault;
  91        dirent = buf->current_dir;
  92        if (put_user(d_ino, &dirent->d_ino) ||
  93            put_user(reclen, &dirent->d_reclen) ||
  94            put_user(namlen, &dirent->d_namlen) ||
  95            copy_to_user(dirent->d_name, name, namlen) ||
  96            put_user(0, dirent->d_name + namlen))
  97                goto Efault;
  98        buf->previous = dirent;
  99        buf->current_dir = (void __user *)dirent + reclen;
 100        buf->count -= reclen;
 101        return 0;
 102Efault:
 103        buf->error = -EFAULT;
 104        return -EFAULT;
 105}
 106
 107#undef NAME_OFFSET
 108
 109int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned int count)
 110{
 111        struct fd arg;
 112        struct hpux_dirent __user * lastdirent;
 113        struct getdents_callback buf;
 114        int error;
 115
 116        arg = fdget(fd);
 117        if (!arg.file)
 118                return -EBADF;
 119
 120        buf.current_dir = dirent;
 121        buf.previous = NULL;
 122        buf.count = count;
 123        buf.error = 0;
 124
 125        error = vfs_readdir(arg.file, filldir, &buf);
 126        if (error >= 0)
 127                error = buf.error;
 128        lastdirent = buf.previous;
 129        if (lastdirent) {
 130                if (put_user(arg.file->f_pos, &lastdirent->d_off))
 131                        error = -EFAULT;
 132                else
 133                        error = count - buf.count;
 134        }
 135
 136        fdput(arg);
 137        return error;
 138}
 139
 140int hpux_mount(const char *fs, const char *path, int mflag,
 141                const char *fstype, const char *dataptr, int datalen)
 142{
 143        return -ENOSYS;
 144}
 145
 146static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
 147{
 148        struct hpux_stat64 tmp;
 149
 150        /* we probably want a different split here - is hpux 12:20? */
 151
 152        if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 153                return -EOVERFLOW;
 154
 155        memset(&tmp, 0, sizeof(tmp));
 156        tmp.st_dev = new_encode_dev(stat->dev);
 157        tmp.st_ino = stat->ino;
 158        tmp.st_mode = stat->mode;
 159        tmp.st_nlink = stat->nlink;
 160        tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 161        tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 162        tmp.st_rdev = new_encode_dev(stat->rdev);
 163        tmp.st_size = stat->size;
 164        tmp.st_atime = stat->atime.tv_sec;
 165        tmp.st_mtime = stat->mtime.tv_sec;
 166        tmp.st_ctime = stat->ctime.tv_sec;
 167        tmp.st_blocks = stat->blocks;
 168        tmp.st_blksize = stat->blksize;
 169        return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 170}
 171
 172long hpux_stat64(const char __user *filename, struct hpux_stat64 __user *statbuf)
 173{
 174        struct kstat stat;
 175        int error = vfs_stat(filename, &stat);
 176
 177        if (!error)
 178                error = cp_hpux_stat(&stat, statbuf);
 179
 180        return error;
 181}
 182
 183long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
 184{
 185        struct kstat stat;
 186        int error = vfs_fstat(fd, &stat);
 187
 188        if (!error)
 189                error = cp_hpux_stat(&stat, statbuf);
 190
 191        return error;
 192}
 193
 194long hpux_lstat64(const char __user *filename,
 195                  struct hpux_stat64 __user *statbuf)
 196{
 197        struct kstat stat;
 198        int error = vfs_lstat(filename, &stat);
 199
 200        if (!error)
 201                error = cp_hpux_stat(&stat, statbuf);
 202
 203        return error;
 204}
 205