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/sched.h>
  27 #include <linux/file.h>
  28 #include <linux/slab.h>
  29 #include <linux/ptrace.h>
  30 #include <asm/errno.h>
  31 #include <asm/uaccess.h>
  32
  33 int hpux_execve(struct pt_regs *regs)
  34 {
  35         int error;
  36         char *filename;
  37
  38         filename = getname((char __user *) regs->gr[26]);
  39         error = PTR_ERR(filename);
  40         if (IS_ERR(filename))
  41                 goto out;
  42
  43         error = do_execve(filename, (char __user * __user *) regs->gr[25],
  44                 (char __user * __user *) regs->gr[24], regs);
  45
  46         if (error == 0) {
  47                 task_lock(current);
  48                 current->ptrace &= ~PT_DTRACE;
  49                 task_unlock(current);
  50         }
  51         putname(filename);
  52
  53 out:
  54         return error;
  55 }
  56
  57 struct hpux_dirent {
  58         loff_t  d_off;
  59         ino_t   d_ino;
  60         short   d_reclen;
  61         short   d_namlen;
  62         char    d_name[1];
  63 };
  64
  65 struct getdents_callback {
  66         struct hpux_dirent __user *current_dir;
  67         struct hpux_dirent __user *previous;
  68         int count;
  69         int error;
  70 };
  71
  72 #define NAME_OFFSET(de) ((int) ((de)->d_name - (char __user *) (de)))
  73
  74 static int filldir(void * __buf, const char * name, int namlen, loff_t offset,
  75                 u64 ino, unsigned d_type)
  76 {
  77         struct hpux_dirent __user * dirent;
  78         struct getdents_callback * buf = (struct getdents_callback *) __buf;
  79         ino_t d_ino;
  80         int reclen = ALIGN(NAME_OFFSET(dirent) + namlen + 1, sizeof(long));
  81
  82         buf->error = -EINVAL;   /* only used if we fail.. */
  83         if (reclen > buf->count)
  84                 return -EINVAL;
  85         d_ino = ino;
  86         if (sizeof(d_ino) < sizeof(ino) && d_ino != ino)
  87                 return -EOVERFLOW;
  88         dirent = buf->previous;
  89         if (dirent)
  90                 put_user(offset, &dirent->d_off);
  91         dirent = buf->current_dir;
  92         buf->previous = dirent;
  93         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         dirent = (void __user *)dirent + reclen;
  99         buf->current_dir = dirent;
 100         buf->count -= reclen;
 101         return 0;
 102 }
 103
 104 #undef NAME_OFFSET
 105
 106 int hpux_getdents(unsigned int fd, struct hpux_dirent __user *dirent, unsigned int count)
 107 {
 108         struct file * file;
 109         struct hpux_dirent __user * lastdirent;
 110         struct getdents_callback buf;
 111         int error = -EBADF;
 112
 113         file = fget(fd);
 114         if (!file)
 115                 goto out;
 116
 117         buf.current_dir = dirent;
 118         buf.previous = NULL;
 119         buf.count = count;
 120         buf.error = 0;
 121
 122         error = vfs_readdir(file, filldir, &buf);
 123         if (error < 0)
 124                 goto out_putf;
 125         error = buf.error;
 126         lastdirent = buf.previous;
 127         if (lastdirent) {
 128                 put_user(file->f_pos, &lastdirent->d_off);
 129                 error = count - buf.count;
 130         }
 131
 132 out_putf:
 133         fput(file);
 134 out:
 135         return error;
 136 }
 137
 138 int hpux_mount(const char *fs, const char *path, int mflag,
 139                 const char *fstype, const char *dataptr, int datalen)
 140 {
 141         return -ENOSYS;
 142 }
 143
 144 static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
 145 {
 146         struct hpux_stat64 tmp;
 147
 148         /* we probably want a different split here - is hpux 12:20? */
 149
 150         if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 151                 return -EOVERFLOW;
 152
 153         memset(&tmp, 0, sizeof(tmp));
 154         tmp.st_dev = new_encode_dev(stat->dev);
 155         tmp.st_ino = stat->ino;
 156         tmp.st_mode = stat->mode;
 157         tmp.st_nlink = stat->nlink;
 158         tmp.st_uid = stat->uid;
 159         tmp.st_gid = stat->gid;
 160         tmp.st_rdev = new_encode_dev(stat->rdev);
 161         tmp.st_size = stat->size;
 162         tmp.st_atime = stat->atime.tv_sec;
 163         tmp.st_mtime = stat->mtime.tv_sec;
 164         tmp.st_ctime = stat->ctime.tv_sec;
 165         tmp.st_blocks = stat->blocks;
 166         tmp.st_blksize = stat->blksize;
 167         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 168 }
 169
 170 long hpux_stat64(char __user *filename, struct hpux_stat64 __user *statbuf)
 171 {
 172         struct kstat stat;
 173         int error = vfs_stat(filename, &stat);
 174
 175         if (!error)
 176                 error = cp_hpux_stat(&stat, statbuf);
 177
 178         return error;
 179 }
 180
 181 long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
 182 {
 183         struct kstat stat;
 184         int error = vfs_fstat(fd, &stat);
 185
 186         if (!error)
 187                 error = cp_hpux_stat(&stat, statbuf);
 188
 189         return error;
 190 }
 191
 192 long hpux_lstat64(char __user *filename, struct hpux_stat64 __user *statbuf)
 193 {
 194         struct kstat stat;
 195         int error = vfs_lstat(filename, &stat);
 196
 197         if (!error)
 198                 error = cp_hpux_stat(&stat, statbuf);
 199
 200         return error;
 201 }