arch/parisc/hpux/fs.c

   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
  34 int 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
  50 out:
  51         return error;
  52 }
  53
  54 struct 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
  62 struct getdents_callback {
  63         struct dir_context ctx;
  64         struct hpux_dirent __user *current_dir;
  65         struct hpux_dirent __user *previous;
  66         int count;
  67         int error;
  68 };
  69
  70 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  71
  72 static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
  73                 u64 ino, unsigned d_type)
  74 {
  75         struct hpux_dirent __user * dirent;
  76         struct getdents_callback * buf = (struct getdents_callback *) __buf;
  77         ino_t d_ino;
  78         int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(long));
  79
  80         buf->error = -EINVAL;   /* only used if we fail.. */
  81         if (reclen > buf->count)
  82                 return -EINVAL;
  83         d_ino = ino;
  84         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
  85                 buf->error = -EOVERFLOW;
  86                 return -EOVERFLOW;
  87         }
  88         dirent = buf->previous;
  89         if (dirent)
  90                 if (put_user(offset, &dirent->d_off))
  91                         goto Efault;
  92         dirent = buf->current_dir;
  93         if (put_user(d_ino, &dirent->d_ino) ||
  94             put_user(reclen, &dirent->d_reclen) ||
  95             put_user(namlen, &dirent->d_namlen) ||
  96             copy_to_user(dirent->d_name, name, namlen) ||
  97             put_user(0, dirent->d_name + namlen))
  98                 goto Efault;
  99         buf->previous = dirent;
 100         buf->current_dir = (void __user *)dirent + reclen;
 101         buf->count -= reclen;
 102         return 0;
 103 Efault:
 104         buf->error = -EFAULT;
 105         return -EFAULT;
 106 }
 107
 108 #undef NAME_OFFSET
 109
 110 int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned int count)
 111 {
 112         struct fd arg;
 113         struct hpux_dirent __user * lastdirent;
 114         struct getdents_callback buf;
 115         int error;
 116
 117         arg = fdget(fd);
 118         if (!arg.file)
 119                 return -EBADF;
 120
 121         buf.current_dir = dirent;
 122         buf.previous = NULL;
 123         buf.count = count;
 124         buf.error = 0;
 125         buf.ctx.actor = filldir;
 126
 127         error = iterate_dir(arg.file, &buf.ctx);
 128         if (error >= 0)
 129                 error = buf.error;
 130         lastdirent = buf.previous;
 131         if (lastdirent) {
 132                 if (put_user(arg.file->f_pos, &lastdirent->d_off))
 133                         error = -EFAULT;
 134                 else
 135                         error = count - buf.count;
 136         }
 137
 138         fdput(arg);
 139         return error;
 140 }
 141
 142 int hpux_mount(const char *fs, const char *path, int mflag,
 143                 const char *fstype, const char *dataptr, int datalen)
 144 {
 145         return -ENOSYS;
 146 }
 147
 148 static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
 149 {
 150         struct hpux_stat64 tmp;
 151
 152         /* we probably want a different split here - is hpux 12:20? */
 153
 154         if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 155                 return -EOVERFLOW;
 156
 157         memset(&tmp, 0, sizeof(tmp));
 158         tmp.st_dev = new_encode_dev(stat->dev);
 159         tmp.st_ino = stat->ino;
 160         tmp.st_mode = stat->mode;
 161         tmp.st_nlink = stat->nlink;
 162         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 163         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 164         tmp.st_rdev = new_encode_dev(stat->rdev);
 165         tmp.st_size = stat->size;
 166         tmp.st_atime = stat->atime.tv_sec;
 167         tmp.st_mtime = stat->mtime.tv_sec;
 168         tmp.st_ctime = stat->ctime.tv_sec;
 169         tmp.st_blocks = stat->blocks;
 170         tmp.st_blksize = stat->blksize;
 171         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 172 }
 173
 174 long hpux_stat64(const char __user *filename, struct hpux_stat64 __user *statbuf)
 175 {
 176         struct kstat stat;
 177         int error = vfs_stat(filename, &stat);
 178
 179         if (!error)
 180                 error = cp_hpux_stat(&stat, statbuf);
 181
 182         return error;
 183 }
 184
 185 long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
 186 {
 187         struct kstat stat;
 188         int error = vfs_fstat(fd, &stat);
 189
 190         if (!error)
 191                 error = cp_hpux_stat(&stat, statbuf);
 192
 193         return error;
 194 }
 195
 196 long hpux_lstat64(const char __user *filename,
 197                   struct hpux_stat64 __user *statbuf)
 198 {
 199         struct kstat stat;
 200         int error = vfs_lstat(filename, &stat);
 201
 202         if (!error)
 203                 error = cp_hpux_stat(&stat, statbuf);
 204
 205         return error;
 206 }