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         return  do_execve(getname((const char __user *) regs->gr[26]),
  37                           (const char __user *const __user *) regs->gr[25],
  38                           (const char __user *const __user *) regs->gr[24]);
  39 }
  40
  41 struct hpux_dirent {
  42         loff_t  d_off;
  43         ino_t   d_ino;
  44         short   d_reclen;
  45         short   d_namlen;
  46         char    d_name[1];
  47 };
  48
  49 struct getdents_callback {
  50         struct dir_context ctx;
  51         struct hpux_dirent __user *current_dir;
  52         struct hpux_dirent __user *previous;
  53         int count;
  54         int error;
  55 };
  56
  57 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  58
  59 static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
  60                 u64 ino, unsigned d_type)
  61 {
  62         struct hpux_dirent __user * dirent;
  63         struct getdents_callback * buf = (struct getdents_callback *) __buf;
  64         ino_t d_ino;
  65         int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(long));
  66
  67         buf->error = -EINVAL;   /* only used if we fail.. */
  68         if (reclen > buf->count)
  69                 return -EINVAL;
  70         d_ino = ino;
  71         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino) {
  72                 buf->error = -EOVERFLOW;
  73                 return -EOVERFLOW;
  74         }
  75         dirent = buf->previous;
  76         if (dirent)
  77                 if (put_user(offset, &dirent->d_off))
  78                         goto Efault;
  79         dirent = buf->current_dir;
  80         if (put_user(d_ino, &dirent->d_ino) ||
  81             put_user(reclen, &dirent->d_reclen) ||
  82             put_user(namlen, &dirent->d_namlen) ||
  83             copy_to_user(dirent->d_name, name, namlen) ||
  84             put_user(0, dirent->d_name + namlen))
  85                 goto Efault;
  86         buf->previous = dirent;
  87         buf->current_dir = (void __user *)dirent + reclen;
  88         buf->count -= reclen;
  89         return 0;
  90 Efault:
  91         buf->error = -EFAULT;
  92         return -EFAULT;
  93 }
  94
  95 #undef NAME_OFFSET
  96
  97 int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned int count)
  98 {
  99         struct fd arg;
 100         struct hpux_dirent __user * lastdirent;
 101         struct getdents_callback buf = {
 102                 .ctx.actor = filldir,
 103                 .current_dir = dirent,
 104                 .count = count
 105         };
 106         int error;
 107
 108         arg = fdget(fd);
 109         if (!arg.file)
 110                 return -EBADF;
 111
 112         error = iterate_dir(arg.file, &buf.ctx);
 113         if (error >= 0)
 114                 error = buf.error;
 115         lastdirent = buf.previous;
 116         if (lastdirent) {
 117                 if (put_user(buf.ctx.pos, &lastdirent->d_off))
 118                         error = -EFAULT;
 119                 else
 120                         error = count - buf.count;
 121         }
 122
 123         fdput(arg);
 124         return error;
 125 }
 126
 127 int hpux_mount(const char *fs, const char *path, int mflag,
 128                 const char *fstype, const char *dataptr, int datalen)
 129 {
 130         return -ENOSYS;
 131 }
 132
 133 static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
 134 {
 135         struct hpux_stat64 tmp;
 136
 137         /* we probably want a different split here - is hpux 12:20? */
 138
 139         if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 140                 return -EOVERFLOW;
 141
 142         memset(&tmp, 0, sizeof(tmp));
 143         tmp.st_dev = new_encode_dev(stat->dev);
 144         tmp.st_ino = stat->ino;
 145         tmp.st_mode = stat->mode;
 146         tmp.st_nlink = stat->nlink;
 147         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 148         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 149         tmp.st_rdev = new_encode_dev(stat->rdev);
 150         tmp.st_size = stat->size;
 151         tmp.st_atime = stat->atime.tv_sec;
 152         tmp.st_mtime = stat->mtime.tv_sec;
 153         tmp.st_ctime = stat->ctime.tv_sec;
 154         tmp.st_blocks = stat->blocks;
 155         tmp.st_blksize = stat->blksize;
 156         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 157 }
 158
 159 long hpux_stat64(const char __user *filename, struct hpux_stat64 __user *statbuf)
 160 {
 161         struct kstat stat;
 162         int error = vfs_stat(filename, &stat);
 163
 164         if (!error)
 165                 error = cp_hpux_stat(&stat, statbuf);
 166
 167         return error;
 168 }
 169
 170 long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
 171 {
 172         struct kstat stat;
 173         int error = vfs_fstat(fd, &stat);
 174
 175         if (!error)
 176                 error = cp_hpux_stat(&stat, statbuf);
 177
 178         return error;
 179 }
 180
 181 long hpux_lstat64(const char __user *filename,
 182                   struct hpux_stat64 __user *statbuf)
 183 {
 184         struct kstat stat;
 185         int error = vfs_lstat(filename, &stat);
 186
 187         if (!error)
 188                 error = cp_hpux_stat(&stat, statbuf);
 189
 190         return error;
 191 }