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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 
 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                           regs);
 48 
 49         putname(filename);
 50 
 51 out:
 52         return error;
 53 }
 54 
 55 struct hpux_dirent {
 56         loff_t  d_off;
 57         ino_t   d_ino;
 58         short   d_reclen;
 59         short   d_namlen;
 60         char    d_name[1];
 61 };
 62 
 63 struct getdents_callback {
 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 
126         error = vfs_readdir(arg.file, filldir, &buf);
127         if (error >= 0)
128                 error = buf.error;
129         lastdirent = buf.previous;
130         if (lastdirent) {
131                 if (put_user(arg.file->f_pos, &lastdirent->d_off))
132                         error = -EFAULT;
133                 else
134                         error = count - buf.count;
135         }
136 
137         fdput(arg);
138         return error;
139 }
140 
141 int hpux_mount(const char *fs, const char *path, int mflag,
142                 const char *fstype, const char *dataptr, int datalen)
143 {
144         return -ENOSYS;
145 }
146 
147 static int cp_hpux_stat(struct kstat *stat, struct hpux_stat64 __user *statbuf)
148 {
149         struct hpux_stat64 tmp;
150 
151         /* we probably want a different split here - is hpux 12:20? */
152 
153         if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
154                 return -EOVERFLOW;
155 
156         memset(&tmp, 0, sizeof(tmp));
157         tmp.st_dev = new_encode_dev(stat->dev);
158         tmp.st_ino = stat->ino;
159         tmp.st_mode = stat->mode;
160         tmp.st_nlink = stat->nlink;
161         tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
162         tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
163         tmp.st_rdev = new_encode_dev(stat->rdev);
164         tmp.st_size = stat->size;
165         tmp.st_atime = stat->atime.tv_sec;
166         tmp.st_mtime = stat->mtime.tv_sec;
167         tmp.st_ctime = stat->ctime.tv_sec;
168         tmp.st_blocks = stat->blocks;
169         tmp.st_blksize = stat->blksize;
170         return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
171 }
172 
173 long hpux_stat64(const char __user *filename, struct hpux_stat64 __user *statbuf)
174 {
175         struct kstat stat;
176         int error = vfs_stat(filename, &stat);
177 
178         if (!error)
179                 error = cp_hpux_stat(&stat, statbuf);
180 
181         return error;
182 }
183 
184 long hpux_fstat64(unsigned int fd, struct hpux_stat64 __user *statbuf)
185 {
186         struct kstat stat;
187         int error = vfs_fstat(fd, &stat);
188 
189         if (!error)
190                 error = cp_hpux_stat(&stat, statbuf);
191 
192         return error;
193 }
194 
195 long hpux_lstat64(const char __user *filename,
196                   struct hpux_stat64 __user *statbuf)
197 {
198         struct kstat stat;
199         int error = vfs_lstat(filename, &stat);
200 
201         if (!error)
202                 error = cp_hpux_stat(&stat, statbuf);
203 
204         return error;
205 }
206 

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