linux_file64.c revision 1.43
1 /* $NetBSD: linux_file64.c,v 1.43 2007/12/08 18:36:07 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1995, 1998, 2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Frank van der Linden and Eric Haszlakiewicz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Linux 64bit filesystem calls. Used on 32bit archs, not used on 64bit ones. 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: linux_file64.c,v 1.43 2007/12/08 18:36:07 dsl Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/namei.h> 49 #include <sys/proc.h> 50 #include <sys/dirent.h> 51 #include <sys/file.h> 52 #include <sys/stat.h> 53 #include <sys/filedesc.h> 54 #include <sys/ioctl.h> 55 #include <sys/kernel.h> 56 #include <sys/mount.h> 57 #include <sys/malloc.h> 58 #include <sys/namei.h> 59 #include <sys/vfs_syscalls.h> 60 #include <sys/vnode.h> 61 #include <sys/tty.h> 62 #include <sys/conf.h> 63 64 #include <sys/syscallargs.h> 65 66 #include <compat/linux/common/linux_types.h> 67 #include <compat/linux/common/linux_signal.h> 68 #include <compat/linux/common/linux_fcntl.h> 69 #include <compat/linux/common/linux_util.h> 70 #include <compat/linux/common/linux_machdep.h> 71 #include <compat/linux/common/linux_dirent.h> 72 #include <compat/linux/common/linux_ipc.h> 73 #include <compat/linux/common/linux_sem.h> 74 75 #include <compat/linux/linux_syscallargs.h> 76 77 #ifndef alpha 78 79 # ifndef COMPAT_LINUX32 80 81 static void bsd_to_linux_stat(struct stat *, struct linux_stat64 *); 82 static int linux_do_stat64(struct lwp *, void *, register_t *, int); 83 84 /* 85 * Convert a NetBSD stat structure to a Linux stat structure. 86 * Only the order of the fields and the padding in the structure 87 * is different. linux_fakedev is a machine-dependent function 88 * which optionally converts device driver major/minor numbers 89 * (XXX horrible, but what can you do against code that compares 90 * things against constant major device numbers? sigh) 91 */ 92 static void 93 bsd_to_linux_stat(struct stat *bsp, struct linux_stat64 *lsp) 94 { 95 lsp->lst_dev = linux_fakedev(bsp->st_dev, 0); 96 lsp->lst_ino = bsp->st_ino; 97 lsp->lst_mode = (linux_mode_t)bsp->st_mode; 98 if (bsp->st_nlink >= (1 << 15)) 99 lsp->lst_nlink = (1 << 15) - 1; 100 else 101 lsp->lst_nlink = (linux_nlink_t)bsp->st_nlink; 102 lsp->lst_uid = bsp->st_uid; 103 lsp->lst_gid = bsp->st_gid; 104 lsp->lst_rdev = linux_fakedev(bsp->st_rdev, 1); 105 lsp->lst_size = bsp->st_size; 106 lsp->lst_blksize = bsp->st_blksize; 107 lsp->lst_blocks = bsp->st_blocks; 108 lsp->lst_atime = bsp->st_atime; 109 lsp->lst_mtime = bsp->st_mtime; 110 lsp->lst_ctime = bsp->st_ctime; 111 # ifdef LINUX_STAT64_HAS_NSEC 112 lsp->lst_atime_nsec = bsp->st_atimensec; 113 lsp->lst_mtime_nsec = bsp->st_mtimensec; 114 lsp->lst_ctime_nsec = bsp->st_ctimensec; 115 # endif 116 # if LINUX_STAT64_HAS_BROKEN_ST_INO 117 lsp->__lst_ino = (linux_ino_t) bsp->st_ino; 118 # endif 119 } 120 121 /* 122 * The stat functions below are plain sailing. stat and lstat are handled 123 * by one function to avoid code duplication. 124 */ 125 int 126 linux_sys_fstat64(struct lwp *l, void *v, register_t *retval) 127 { 128 struct linux_sys_fstat64_args /* { 129 syscallarg(int) fd; 130 syscallarg(struct linux_stat64 *) sp; 131 } */ *uap = v; 132 struct linux_stat64 tmplst; 133 struct stat tmpst; 134 int error; 135 136 error = do_sys_fstat(l, SCARG(uap, fd), &tmpst); 137 if (error != 0) 138 return error; 139 140 bsd_to_linux_stat(&tmpst, &tmplst); 141 142 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 143 } 144 145 static int 146 linux_do_stat64(struct lwp *l, void *v, register_t *retval, int flags) 147 { 148 struct linux_stat64 tmplst; 149 struct stat tmpst; 150 int error; 151 struct linux_sys_stat64_args *uap = v; 152 153 error = do_sys_stat(l, SCARG(uap, path), flags, &tmpst); 154 if (error != 0) 155 return error; 156 157 bsd_to_linux_stat(&tmpst, &tmplst); 158 159 return copyout(&tmplst, SCARG(uap, sp), sizeof tmplst); 160 } 161 162 int 163 linux_sys_stat64(struct lwp *l, void *v, register_t *retval) 164 { 165 struct linux_sys_stat64_args /* { 166 syscallarg(const char *) path; 167 syscallarg(struct linux_stat64 *) sp; 168 } */ *uap = v; 169 170 return linux_do_stat64(l, uap, retval, FOLLOW); 171 } 172 173 int 174 linux_sys_lstat64(struct lwp *l, void *v, register_t *retval) 175 { 176 struct linux_sys_lstat64_args /* { 177 syscallarg(const char *) path; 178 syscallarg(struct linux_stat64 *) sp; 179 } */ *uap = v; 180 181 return linux_do_stat64(l, uap, retval, NOFOLLOW); 182 } 183 184 int 185 linux_sys_truncate64(struct lwp *l, void *v, register_t *retval) 186 { 187 struct linux_sys_truncate64_args /* { 188 syscallarg(const char *) path; 189 syscallarg(off_t) length; 190 } */ *uap = v; 191 struct sys_truncate_args ta; 192 193 /* Linux doesn't have the 'pad' pseudo-parameter */ 194 SCARG(&ta, path) = SCARG(uap, path); 195 SCARG(&ta, pad) = 0; 196 SCARG(&ta, length) = SCARG(uap, length); 197 198 return sys_truncate(l, &ta, retval); 199 } 200 201 int 202 linux_sys_ftruncate64(struct lwp *l, void *v, register_t *retval) 203 { 204 struct linux_sys_ftruncate64_args /* { 205 syscallarg(unsigned int) fd; 206 syscallarg(off_t) length; 207 } */ *uap = v; 208 struct sys_ftruncate_args ta; 209 210 /* Linux doesn't have the 'pad' pseudo-parameter */ 211 SCARG(&ta, fd) = SCARG(uap, fd); 212 SCARG(&ta, pad) = 0; 213 SCARG(&ta, length) = SCARG(uap, length); 214 215 return sys_ftruncate(l, &ta, retval); 216 } 217 # endif /* !COMPAT_LINUX32 */ 218 219 # if !defined(__m68k__) && (!defined(__amd64__) || defined(COMPAT_LINUX32)) 220 static void bsd_to_linux_flock64(struct linux_flock64 *, 221 const struct flock *); 222 static void linux_to_bsd_flock64(struct flock *, 223 const struct linux_flock64 *); 224 225 static void 226 bsd_to_linux_flock64(struct linux_flock64 *lfp, const struct flock *bfp) 227 { 228 229 lfp->l_start = bfp->l_start; 230 lfp->l_len = bfp->l_len; 231 lfp->l_pid = bfp->l_pid; 232 lfp->l_whence = bfp->l_whence; 233 switch (bfp->l_type) { 234 case F_RDLCK: 235 lfp->l_type = LINUX_F_RDLCK; 236 break; 237 case F_UNLCK: 238 lfp->l_type = LINUX_F_UNLCK; 239 break; 240 case F_WRLCK: 241 lfp->l_type = LINUX_F_WRLCK; 242 break; 243 } 244 } 245 246 static void 247 linux_to_bsd_flock64(struct flock *bfp, const struct linux_flock64 *lfp) 248 { 249 250 bfp->l_start = lfp->l_start; 251 bfp->l_len = lfp->l_len; 252 bfp->l_pid = lfp->l_pid; 253 bfp->l_whence = lfp->l_whence; 254 switch (lfp->l_type) { 255 case LINUX_F_RDLCK: 256 bfp->l_type = F_RDLCK; 257 break; 258 case LINUX_F_UNLCK: 259 bfp->l_type = F_UNLCK; 260 break; 261 case LINUX_F_WRLCK: 262 bfp->l_type = F_WRLCK; 263 break; 264 } 265 } 266 267 int 268 linux_sys_fcntl64(struct lwp *l, void *v, register_t *retval) 269 { 270 struct linux_sys_fcntl64_args /* { 271 syscallarg(int) fd; 272 syscallarg(int) cmd; 273 syscallarg(void *) arg; 274 } */ *uap = v; 275 struct linux_flock64 lfl; 276 struct flock bfl; 277 int error; 278 void *arg = SCARG(uap, arg); 279 int cmd = SCARG(uap, cmd); 280 int fd = SCARG(uap, fd); 281 282 switch (cmd) { 283 case LINUX_F_GETLK64: 284 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 285 return error; 286 linux_to_bsd_flock64(&bfl, &lfl); 287 error = do_fcntl_lock(l, fd, F_GETLK, &bfl); 288 if (error != 0) 289 return error; 290 bsd_to_linux_flock64(&lfl, &bfl); 291 return copyout(&lfl, arg, sizeof lfl); 292 case LINUX_F_SETLK64: 293 case LINUX_F_SETLKW64: 294 cmd = (cmd == LINUX_F_SETLK64 ? F_SETLK : F_SETLKW); 295 if ((error = copyin(arg, &lfl, sizeof lfl)) != 0) 296 return error; 297 linux_to_bsd_flock64(&bfl, &lfl); 298 return do_fcntl_lock(l, fd, cmd, &bfl); 299 default: 300 return linux_sys_fcntl(l, v, retval); 301 } 302 } 303 # endif /* !m69k && !amd64 && !COMPAT_LINUX32 */ 304 305 #endif /* !alpha */ 306 307 /* 308 * Linux 'readdir' call. This code is mostly taken from the 309 * SunOS getdents call (see compat/sunos/sunos_misc.c), though 310 * an attempt has been made to keep it a little cleaner. 311 * 312 * The d_off field contains the offset of the next valid entry, 313 * unless the older Linux getdents(2), which used to have it set 314 * to the offset of the entry itself. This function also doesn't 315 * need to deal with the old count == 1 glibc problem. 316 * 317 * Read in BSD-style entries, convert them, and copy them out. 318 * 319 * Note that this doesn't handle union-mounted filesystems. 320 */ 321 #ifndef COMPAT_LINUX32 322 int 323 linux_sys_getdents64(struct lwp *l, void *v, register_t *retval) 324 { 325 struct linux_sys_getdents_args /* { 326 syscallarg(int) fd; 327 syscallarg(struct linux_dirent64 *) dent; 328 syscallarg(unsigned int) count; 329 } */ *uap = v; 330 struct dirent *bdp; 331 struct vnode *vp; 332 char *inp, *tbuf; /* BSD-format */ 333 int len, reclen; /* BSD-format */ 334 char *outp; /* Linux-format */ 335 int resid, linux_reclen = 0; /* Linux-format */ 336 struct file *fp; 337 struct uio auio; 338 struct iovec aiov; 339 struct linux_dirent64 idb; 340 off_t off; /* true file offset */ 341 int buflen, error, eofflag, nbytes; 342 struct vattr va; 343 off_t *cookiebuf = NULL, *cookie; 344 int ncookies; 345 346 /* getvnode() will use the descriptor for us */ 347 if ((error = getvnode(l->l_proc->p_fd, SCARG(uap, fd), &fp)) != 0) 348 return (error); 349 350 if ((fp->f_flag & FREAD) == 0) { 351 error = EBADF; 352 goto out1; 353 } 354 355 vp = (struct vnode *)fp->f_data; 356 if (vp->v_type != VDIR) { 357 error = EINVAL; 358 goto out1; 359 } 360 361 if ((error = VOP_GETATTR(vp, &va, l->l_cred))) 362 goto out1; 363 364 nbytes = SCARG(uap, count); 365 buflen = min(MAXBSIZE, nbytes); 366 if (buflen < va.va_blocksize) 367 buflen = va.va_blocksize; 368 tbuf = malloc(buflen, M_TEMP, M_WAITOK); 369 370 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 371 off = fp->f_offset; 372 again: 373 aiov.iov_base = tbuf; 374 aiov.iov_len = buflen; 375 auio.uio_iov = &aiov; 376 auio.uio_iovcnt = 1; 377 auio.uio_rw = UIO_READ; 378 auio.uio_resid = buflen; 379 auio.uio_offset = off; 380 UIO_SETUP_SYSSPACE(&auio); 381 /* 382 * First we read into the malloc'ed buffer, then 383 * we massage it into user space, one record at a time. 384 */ 385 error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, &cookiebuf, 386 &ncookies); 387 if (error) 388 goto out; 389 390 inp = tbuf; 391 outp = (void *)SCARG(uap, dent); 392 resid = nbytes; 393 if ((len = buflen - auio.uio_resid) == 0) 394 goto eof; 395 396 for (cookie = cookiebuf; len > 0; len -= reclen) { 397 bdp = (struct dirent *)inp; 398 reclen = bdp->d_reclen; 399 if (reclen & 3) 400 panic("linux_readdir"); 401 if (bdp->d_fileno == 0) { 402 inp += reclen; /* it is a hole; squish it out */ 403 if (cookie) 404 off = *cookie++; 405 else 406 off += reclen; 407 continue; 408 } 409 linux_reclen = LINUX_RECLEN(&idb, bdp->d_namlen); 410 if (reclen > len || resid < linux_reclen) { 411 /* entry too big for buffer, so just stop */ 412 outp++; 413 break; 414 } 415 if (cookie) 416 off = *cookie++; /* each entry points to next */ 417 else 418 off += reclen; 419 /* 420 * Massage in place to make a Linux-shaped dirent (otherwise 421 * we have to worry about touching user memory outside of 422 * the copyout() call). 423 */ 424 idb.d_ino = bdp->d_fileno; 425 idb.d_type = bdp->d_type; 426 idb.d_off = off; 427 idb.d_reclen = (u_short)linux_reclen; 428 strcpy(idb.d_name, bdp->d_name); 429 if ((error = copyout((void *)&idb, outp, linux_reclen))) 430 goto out; 431 /* advance past this real entry */ 432 inp += reclen; 433 /* advance output past Linux-shaped entry */ 434 outp += linux_reclen; 435 resid -= linux_reclen; 436 } 437 438 /* if we squished out the whole block, try again */ 439 if (outp == (void *)SCARG(uap, dent)) 440 goto again; 441 fp->f_offset = off; /* update the vnode offset */ 442 443 eof: 444 *retval = nbytes - resid; 445 out: 446 VOP_UNLOCK(vp, 0); 447 if (cookiebuf) 448 free(cookiebuf, M_TEMP); 449 free(tbuf, M_TEMP); 450 out1: 451 FILE_UNUSE(fp, l); 452 return error; 453 } 454 #endif /* !COMPAT_LINUX32 */ 455
Indexes created Thu Sep 25 14:09:45 GMT 2025