| 1 | /* $NetBSD: vfs_vnops.c,v 1.193 2015/02/04 07:09:37 msaitoh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2009 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Andrew Doran. |
| 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 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | * Copyright (c) 1982, 1986, 1989, 1993 |
| 34 | * The Regents of the University of California. All rights reserved. |
| 35 | * (c) UNIX System Laboratories, Inc. |
| 36 | * All or some portions of this file are derived from material licensed |
| 37 | * to the University of California by American Telephone and Telegraph |
| 38 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 39 | * the permission of UNIX System Laboratories, Inc. |
| 40 | * |
| 41 | * Redistribution and use in source and binary forms, with or without |
| 42 | * modification, are permitted provided that the following conditions |
| 43 | * are met: |
| 44 | * 1. Redistributions of source code must retain the above copyright |
| 45 | * notice, this list of conditions and the following disclaimer. |
| 46 | * 2. Redistributions in binary form must reproduce the above copyright |
| 47 | * notice, this list of conditions and the following disclaimer in the |
| 48 | * documentation and/or other materials provided with the distribution. |
| 49 | * 3. Neither the name of the University nor the names of its contributors |
| 50 | * may be used to endorse or promote products derived from this software |
| 51 | * without specific prior written permission. |
| 52 | * |
| 53 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 54 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 55 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 56 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 57 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 58 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 59 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 60 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 61 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 62 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 63 | * SUCH DAMAGE. |
| 64 | * |
| 65 | * @(#)vfs_vnops.c 8.14 (Berkeley) 6/15/95 |
| 66 | */ |
| 67 | |
| 68 | #include <sys/cdefs.h> |
| 69 | __KERNEL_RCSID(0, "$NetBSD: vfs_vnops.c,v 1.193 2015/02/04 07:09:37 msaitoh Exp $" ); |
| 70 | |
| 71 | #include "veriexec.h" |
| 72 | |
| 73 | #include <sys/param.h> |
| 74 | #include <sys/systm.h> |
| 75 | #include <sys/kernel.h> |
| 76 | #include <sys/file.h> |
| 77 | #include <sys/stat.h> |
| 78 | #include <sys/buf.h> |
| 79 | #include <sys/proc.h> |
| 80 | #include <sys/mount.h> |
| 81 | #include <sys/namei.h> |
| 82 | #include <sys/vnode.h> |
| 83 | #include <sys/ioctl.h> |
| 84 | #include <sys/tty.h> |
| 85 | #include <sys/poll.h> |
| 86 | #include <sys/kauth.h> |
| 87 | #include <sys/syslog.h> |
| 88 | #include <sys/fstrans.h> |
| 89 | #include <sys/atomic.h> |
| 90 | #include <sys/filedesc.h> |
| 91 | #include <sys/wapbl.h> |
| 92 | #include <sys/mman.h> |
| 93 | |
| 94 | #include <miscfs/specfs/specdev.h> |
| 95 | #include <miscfs/fifofs/fifo.h> |
| 96 | |
| 97 | #include <uvm/uvm_extern.h> |
| 98 | #include <uvm/uvm_readahead.h> |
| 99 | #include <uvm/uvm_device.h> |
| 100 | |
| 101 | #ifdef UNION |
| 102 | #include <fs/union/union.h> |
| 103 | #endif |
| 104 | |
| 105 | #ifndef COMPAT_ZERODEV |
| 106 | #define COMPAT_ZERODEV(dev) (0) |
| 107 | #endif |
| 108 | |
| 109 | int (*vn_union_readdir_hook) (struct vnode **, struct file *, struct lwp *); |
| 110 | |
| 111 | #include <sys/verified_exec.h> |
| 112 | |
| 113 | static int vn_read(file_t *fp, off_t *offset, struct uio *uio, |
| 114 | kauth_cred_t cred, int flags); |
| 115 | static int vn_write(file_t *fp, off_t *offset, struct uio *uio, |
| 116 | kauth_cred_t cred, int flags); |
| 117 | static int vn_closefile(file_t *fp); |
| 118 | static int vn_poll(file_t *fp, int events); |
| 119 | static int vn_fcntl(file_t *fp, u_int com, void *data); |
| 120 | static int vn_statfile(file_t *fp, struct stat *sb); |
| 121 | static int vn_ioctl(file_t *fp, u_long com, void *data); |
| 122 | static int vn_mmap(struct file *, off_t *, size_t, int, int *, int *, |
| 123 | struct uvm_object **, int *); |
| 124 | |
| 125 | const struct fileops vnops = { |
| 126 | .fo_read = vn_read, |
| 127 | .fo_write = vn_write, |
| 128 | .fo_ioctl = vn_ioctl, |
| 129 | .fo_fcntl = vn_fcntl, |
| 130 | .fo_poll = vn_poll, |
| 131 | .fo_stat = vn_statfile, |
| 132 | .fo_close = vn_closefile, |
| 133 | .fo_kqfilter = vn_kqfilter, |
| 134 | .fo_restart = fnullop_restart, |
| 135 | .fo_mmap = vn_mmap, |
| 136 | }; |
| 137 | |
| 138 | /* |
| 139 | * Common code for vnode open operations. |
| 140 | * Check permissions, and call the VOP_OPEN or VOP_CREATE routine. |
| 141 | */ |
| 142 | int |
| 143 | vn_open(struct nameidata *ndp, int fmode, int cmode) |
| 144 | { |
| 145 | struct vnode *vp; |
| 146 | struct lwp *l = curlwp; |
| 147 | kauth_cred_t cred = l->l_cred; |
| 148 | struct vattr va; |
| 149 | int error; |
| 150 | const char *pathstring; |
| 151 | |
| 152 | if ((fmode & (O_CREAT | O_DIRECTORY)) == (O_CREAT | O_DIRECTORY)) |
| 153 | return EINVAL; |
| 154 | |
| 155 | ndp->ni_cnd.cn_flags &= TRYEMULROOT | NOCHROOT; |
| 156 | |
| 157 | if (fmode & O_CREAT) { |
| 158 | ndp->ni_cnd.cn_nameiop = CREATE; |
| 159 | ndp->ni_cnd.cn_flags |= LOCKPARENT | LOCKLEAF; |
| 160 | if ((fmode & O_EXCL) == 0 && |
| 161 | ((fmode & O_NOFOLLOW) == 0)) |
| 162 | ndp->ni_cnd.cn_flags |= FOLLOW; |
| 163 | } else { |
| 164 | ndp->ni_cnd.cn_nameiop = LOOKUP; |
| 165 | ndp->ni_cnd.cn_flags |= LOCKLEAF; |
| 166 | if ((fmode & O_NOFOLLOW) == 0) |
| 167 | ndp->ni_cnd.cn_flags |= FOLLOW; |
| 168 | } |
| 169 | |
| 170 | pathstring = pathbuf_stringcopy_get(ndp->ni_pathbuf); |
| 171 | if (pathstring == NULL) { |
| 172 | return ENOMEM; |
| 173 | } |
| 174 | |
| 175 | error = namei(ndp); |
| 176 | if (error) |
| 177 | goto out; |
| 178 | |
| 179 | vp = ndp->ni_vp; |
| 180 | |
| 181 | #if NVERIEXEC > 0 |
| 182 | error = veriexec_openchk(l, ndp->ni_vp, pathstring, fmode); |
| 183 | if (error) { |
| 184 | /* We have to release the locks ourselves */ |
| 185 | if (fmode & O_CREAT) { |
| 186 | if (vp == NULL) { |
| 187 | vput(ndp->ni_dvp); |
| 188 | } else { |
| 189 | VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); |
| 190 | if (ndp->ni_dvp == ndp->ni_vp) |
| 191 | vrele(ndp->ni_dvp); |
| 192 | else |
| 193 | vput(ndp->ni_dvp); |
| 194 | ndp->ni_dvp = NULL; |
| 195 | vput(vp); |
| 196 | } |
| 197 | } else { |
| 198 | vput(vp); |
| 199 | } |
| 200 | goto out; |
| 201 | } |
| 202 | #endif /* NVERIEXEC > 0 */ |
| 203 | |
| 204 | if (fmode & O_CREAT) { |
| 205 | if (ndp->ni_vp == NULL) { |
| 206 | vattr_null(&va); |
| 207 | va.va_type = VREG; |
| 208 | va.va_mode = cmode; |
| 209 | if (fmode & O_EXCL) |
| 210 | va.va_vaflags |= VA_EXCLUSIVE; |
| 211 | error = VOP_CREATE(ndp->ni_dvp, &ndp->ni_vp, |
| 212 | &ndp->ni_cnd, &va); |
| 213 | vput(ndp->ni_dvp); |
| 214 | if (error) |
| 215 | goto out; |
| 216 | fmode &= ~O_TRUNC; |
| 217 | vp = ndp->ni_vp; |
| 218 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 219 | } else { |
| 220 | VOP_ABORTOP(ndp->ni_dvp, &ndp->ni_cnd); |
| 221 | if (ndp->ni_dvp == ndp->ni_vp) |
| 222 | vrele(ndp->ni_dvp); |
| 223 | else |
| 224 | vput(ndp->ni_dvp); |
| 225 | ndp->ni_dvp = NULL; |
| 226 | vp = ndp->ni_vp; |
| 227 | if (fmode & O_EXCL) { |
| 228 | error = EEXIST; |
| 229 | goto bad; |
| 230 | } |
| 231 | fmode &= ~O_CREAT; |
| 232 | } |
| 233 | } else { |
| 234 | vp = ndp->ni_vp; |
| 235 | } |
| 236 | if (vp->v_type == VSOCK) { |
| 237 | error = EOPNOTSUPP; |
| 238 | goto bad; |
| 239 | } |
| 240 | if (ndp->ni_vp->v_type == VLNK) { |
| 241 | error = EFTYPE; |
| 242 | goto bad; |
| 243 | } |
| 244 | |
| 245 | if ((fmode & O_CREAT) == 0) { |
| 246 | error = vn_openchk(vp, cred, fmode); |
| 247 | if (error != 0) |
| 248 | goto bad; |
| 249 | } |
| 250 | |
| 251 | if (fmode & O_TRUNC) { |
| 252 | vattr_null(&va); |
| 253 | va.va_size = 0; |
| 254 | error = VOP_SETATTR(vp, &va, cred); |
| 255 | if (error != 0) |
| 256 | goto bad; |
| 257 | } |
| 258 | if ((error = VOP_OPEN(vp, fmode, cred)) != 0) |
| 259 | goto bad; |
| 260 | if (fmode & FWRITE) { |
| 261 | mutex_enter(vp->v_interlock); |
| 262 | vp->v_writecount++; |
| 263 | mutex_exit(vp->v_interlock); |
| 264 | } |
| 265 | |
| 266 | bad: |
| 267 | if (error) |
| 268 | vput(vp); |
| 269 | out: |
| 270 | pathbuf_stringcopy_put(ndp->ni_pathbuf, pathstring); |
| 271 | return (error); |
| 272 | } |
| 273 | |
| 274 | /* |
| 275 | * Check for write permissions on the specified vnode. |
| 276 | * Prototype text segments cannot be written. |
| 277 | */ |
| 278 | int |
| 279 | vn_writechk(struct vnode *vp) |
| 280 | { |
| 281 | |
| 282 | /* |
| 283 | * If the vnode is in use as a process's text, |
| 284 | * we can't allow writing. |
| 285 | */ |
| 286 | if (vp->v_iflag & VI_TEXT) |
| 287 | return (ETXTBSY); |
| 288 | return (0); |
| 289 | } |
| 290 | |
| 291 | int |
| 292 | vn_openchk(struct vnode *vp, kauth_cred_t cred, int fflags) |
| 293 | { |
| 294 | int permbits = 0; |
| 295 | int error; |
| 296 | |
| 297 | if ((fflags & O_DIRECTORY) != 0 && vp->v_type != VDIR) |
| 298 | return ENOTDIR; |
| 299 | |
| 300 | if ((fflags & FREAD) != 0) { |
| 301 | permbits = VREAD; |
| 302 | } |
| 303 | if ((fflags & (FWRITE | O_TRUNC)) != 0) { |
| 304 | permbits |= VWRITE; |
| 305 | if (vp->v_type == VDIR) { |
| 306 | error = EISDIR; |
| 307 | goto bad; |
| 308 | } |
| 309 | error = vn_writechk(vp); |
| 310 | if (error != 0) |
| 311 | goto bad; |
| 312 | } |
| 313 | error = VOP_ACCESS(vp, permbits, cred); |
| 314 | bad: |
| 315 | return error; |
| 316 | } |
| 317 | |
| 318 | /* |
| 319 | * Mark a vnode as having executable mappings. |
| 320 | */ |
| 321 | void |
| 322 | vn_markexec(struct vnode *vp) |
| 323 | { |
| 324 | |
| 325 | if ((vp->v_iflag & VI_EXECMAP) != 0) { |
| 326 | /* Safe unlocked, as long as caller holds a reference. */ |
| 327 | return; |
| 328 | } |
| 329 | |
| 330 | mutex_enter(vp->v_interlock); |
| 331 | if ((vp->v_iflag & VI_EXECMAP) == 0) { |
| 332 | atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); |
| 333 | atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); |
| 334 | vp->v_iflag |= VI_EXECMAP; |
| 335 | } |
| 336 | mutex_exit(vp->v_interlock); |
| 337 | } |
| 338 | |
| 339 | /* |
| 340 | * Mark a vnode as being the text of a process. |
| 341 | * Fail if the vnode is currently writable. |
| 342 | */ |
| 343 | int |
| 344 | vn_marktext(struct vnode *vp) |
| 345 | { |
| 346 | |
| 347 | if ((vp->v_iflag & (VI_TEXT|VI_EXECMAP)) == (VI_TEXT|VI_EXECMAP)) { |
| 348 | /* Safe unlocked, as long as caller holds a reference. */ |
| 349 | return (0); |
| 350 | } |
| 351 | |
| 352 | mutex_enter(vp->v_interlock); |
| 353 | if (vp->v_writecount != 0) { |
| 354 | KASSERT((vp->v_iflag & VI_TEXT) == 0); |
| 355 | mutex_exit(vp->v_interlock); |
| 356 | return (ETXTBSY); |
| 357 | } |
| 358 | if ((vp->v_iflag & VI_EXECMAP) == 0) { |
| 359 | atomic_add_int(&uvmexp.filepages, -vp->v_uobj.uo_npages); |
| 360 | atomic_add_int(&uvmexp.execpages, vp->v_uobj.uo_npages); |
| 361 | } |
| 362 | vp->v_iflag |= (VI_TEXT | VI_EXECMAP); |
| 363 | mutex_exit(vp->v_interlock); |
| 364 | return (0); |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Vnode close call |
| 369 | * |
| 370 | * Note: takes an unlocked vnode, while VOP_CLOSE takes a locked node. |
| 371 | */ |
| 372 | int |
| 373 | vn_close(struct vnode *vp, int flags, kauth_cred_t cred) |
| 374 | { |
| 375 | int error; |
| 376 | |
| 377 | if (flags & FWRITE) { |
| 378 | mutex_enter(vp->v_interlock); |
| 379 | KASSERT(vp->v_writecount > 0); |
| 380 | vp->v_writecount--; |
| 381 | mutex_exit(vp->v_interlock); |
| 382 | } |
| 383 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 384 | error = VOP_CLOSE(vp, flags, cred); |
| 385 | vput(vp); |
| 386 | return (error); |
| 387 | } |
| 388 | |
| 389 | static int |
| 390 | enforce_rlimit_fsize(struct vnode *vp, struct uio *uio, int ioflag) |
| 391 | { |
| 392 | struct lwp *l = curlwp; |
| 393 | off_t testoff; |
| 394 | |
| 395 | if (uio->uio_rw != UIO_WRITE || vp->v_type != VREG) |
| 396 | return 0; |
| 397 | |
| 398 | KASSERT(VOP_ISLOCKED(vp) == LK_EXCLUSIVE); |
| 399 | if (ioflag & IO_APPEND) |
| 400 | testoff = vp->v_size; |
| 401 | else |
| 402 | testoff = uio->uio_offset; |
| 403 | |
| 404 | if (testoff + uio->uio_resid > |
| 405 | l->l_proc->p_rlimit[RLIMIT_FSIZE].rlim_cur) { |
| 406 | mutex_enter(proc_lock); |
| 407 | psignal(l->l_proc, SIGXFSZ); |
| 408 | mutex_exit(proc_lock); |
| 409 | return EFBIG; |
| 410 | } |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Package up an I/O request on a vnode into a uio and do it. |
| 417 | */ |
| 418 | int |
| 419 | vn_rdwr(enum uio_rw rw, struct vnode *vp, void *base, int len, off_t offset, |
| 420 | enum uio_seg segflg, int ioflg, kauth_cred_t cred, size_t *aresid, |
| 421 | struct lwp *l) |
| 422 | { |
| 423 | struct uio auio; |
| 424 | struct iovec aiov; |
| 425 | int error; |
| 426 | |
| 427 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 428 | if (rw == UIO_READ) { |
| 429 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 430 | } else /* UIO_WRITE */ { |
| 431 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 432 | } |
| 433 | } |
| 434 | auio.uio_iov = &aiov; |
| 435 | auio.uio_iovcnt = 1; |
| 436 | aiov.iov_base = base; |
| 437 | aiov.iov_len = len; |
| 438 | auio.uio_resid = len; |
| 439 | auio.uio_offset = offset; |
| 440 | auio.uio_rw = rw; |
| 441 | if (segflg == UIO_SYSSPACE) { |
| 442 | UIO_SETUP_SYSSPACE(&auio); |
| 443 | } else { |
| 444 | auio.uio_vmspace = l->l_proc->p_vmspace; |
| 445 | } |
| 446 | |
| 447 | if ((error = enforce_rlimit_fsize(vp, &auio, ioflg)) != 0) |
| 448 | goto out; |
| 449 | |
| 450 | if (rw == UIO_READ) { |
| 451 | error = VOP_READ(vp, &auio, ioflg, cred); |
| 452 | } else { |
| 453 | error = VOP_WRITE(vp, &auio, ioflg, cred); |
| 454 | } |
| 455 | |
| 456 | if (aresid) |
| 457 | *aresid = auio.uio_resid; |
| 458 | else |
| 459 | if (auio.uio_resid && error == 0) |
| 460 | error = EIO; |
| 461 | |
| 462 | out: |
| 463 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 464 | VOP_UNLOCK(vp); |
| 465 | } |
| 466 | return (error); |
| 467 | } |
| 468 | |
| 469 | int |
| 470 | vn_readdir(file_t *fp, char *bf, int segflg, u_int count, int *done, |
| 471 | struct lwp *l, off_t **cookies, int *ncookies) |
| 472 | { |
| 473 | struct vnode *vp = fp->f_vnode; |
| 474 | struct iovec aiov; |
| 475 | struct uio auio; |
| 476 | int error, eofflag; |
| 477 | |
| 478 | /* Limit the size on any kernel buffers used by VOP_READDIR */ |
| 479 | count = min(MAXBSIZE, count); |
| 480 | |
| 481 | unionread: |
| 482 | if (vp->v_type != VDIR) |
| 483 | return (EINVAL); |
| 484 | aiov.iov_base = bf; |
| 485 | aiov.iov_len = count; |
| 486 | auio.uio_iov = &aiov; |
| 487 | auio.uio_iovcnt = 1; |
| 488 | auio.uio_rw = UIO_READ; |
| 489 | if (segflg == UIO_SYSSPACE) { |
| 490 | UIO_SETUP_SYSSPACE(&auio); |
| 491 | } else { |
| 492 | KASSERT(l == curlwp); |
| 493 | auio.uio_vmspace = l->l_proc->p_vmspace; |
| 494 | } |
| 495 | auio.uio_resid = count; |
| 496 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 497 | auio.uio_offset = fp->f_offset; |
| 498 | error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, cookies, |
| 499 | ncookies); |
| 500 | mutex_enter(&fp->f_lock); |
| 501 | fp->f_offset = auio.uio_offset; |
| 502 | mutex_exit(&fp->f_lock); |
| 503 | VOP_UNLOCK(vp); |
| 504 | if (error) |
| 505 | return (error); |
| 506 | |
| 507 | if (count == auio.uio_resid && vn_union_readdir_hook) { |
| 508 | struct vnode *ovp = vp; |
| 509 | |
| 510 | error = (*vn_union_readdir_hook)(&vp, fp, l); |
| 511 | if (error) |
| 512 | return (error); |
| 513 | if (vp != ovp) |
| 514 | goto unionread; |
| 515 | } |
| 516 | |
| 517 | if (count == auio.uio_resid && (vp->v_vflag & VV_ROOT) && |
| 518 | (vp->v_mount->mnt_flag & MNT_UNION)) { |
| 519 | struct vnode *tvp = vp; |
| 520 | vp = vp->v_mount->mnt_vnodecovered; |
| 521 | vref(vp); |
| 522 | mutex_enter(&fp->f_lock); |
| 523 | fp->f_vnode = vp; |
| 524 | fp->f_offset = 0; |
| 525 | mutex_exit(&fp->f_lock); |
| 526 | vrele(tvp); |
| 527 | goto unionread; |
| 528 | } |
| 529 | *done = count - auio.uio_resid; |
| 530 | return error; |
| 531 | } |
| 532 | |
| 533 | /* |
| 534 | * File table vnode read routine. |
| 535 | */ |
| 536 | static int |
| 537 | vn_read(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, |
| 538 | int flags) |
| 539 | { |
| 540 | struct vnode *vp = fp->f_vnode; |
| 541 | int error, ioflag, fflag; |
| 542 | size_t count; |
| 543 | |
| 544 | ioflag = IO_ADV_ENCODE(fp->f_advice); |
| 545 | fflag = fp->f_flag; |
| 546 | if (fflag & FNONBLOCK) |
| 547 | ioflag |= IO_NDELAY; |
| 548 | if ((fflag & (FFSYNC | FRSYNC)) == (FFSYNC | FRSYNC)) |
| 549 | ioflag |= IO_SYNC; |
| 550 | if (fflag & FALTIO) |
| 551 | ioflag |= IO_ALTSEMANTICS; |
| 552 | if (fflag & FDIRECT) |
| 553 | ioflag |= IO_DIRECT; |
| 554 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 555 | uio->uio_offset = *offset; |
| 556 | count = uio->uio_resid; |
| 557 | error = VOP_READ(vp, uio, ioflag, cred); |
| 558 | if (flags & FOF_UPDATE_OFFSET) |
| 559 | *offset += count - uio->uio_resid; |
| 560 | VOP_UNLOCK(vp); |
| 561 | return (error); |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * File table vnode write routine. |
| 566 | */ |
| 567 | static int |
| 568 | vn_write(file_t *fp, off_t *offset, struct uio *uio, kauth_cred_t cred, |
| 569 | int flags) |
| 570 | { |
| 571 | struct vnode *vp = fp->f_vnode; |
| 572 | int error, ioflag, fflag; |
| 573 | size_t count; |
| 574 | |
| 575 | ioflag = IO_ADV_ENCODE(fp->f_advice) | IO_UNIT; |
| 576 | fflag = fp->f_flag; |
| 577 | if (vp->v_type == VREG && (fflag & O_APPEND)) |
| 578 | ioflag |= IO_APPEND; |
| 579 | if (fflag & FNONBLOCK) |
| 580 | ioflag |= IO_NDELAY; |
| 581 | if (fflag & FFSYNC || |
| 582 | (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))) |
| 583 | ioflag |= IO_SYNC; |
| 584 | else if (fflag & FDSYNC) |
| 585 | ioflag |= IO_DSYNC; |
| 586 | if (fflag & FALTIO) |
| 587 | ioflag |= IO_ALTSEMANTICS; |
| 588 | if (fflag & FDIRECT) |
| 589 | ioflag |= IO_DIRECT; |
| 590 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 591 | uio->uio_offset = *offset; |
| 592 | count = uio->uio_resid; |
| 593 | |
| 594 | if ((error = enforce_rlimit_fsize(vp, uio, ioflag)) != 0) |
| 595 | goto out; |
| 596 | |
| 597 | error = VOP_WRITE(vp, uio, ioflag, cred); |
| 598 | |
| 599 | if (flags & FOF_UPDATE_OFFSET) { |
| 600 | if (ioflag & IO_APPEND) { |
| 601 | /* |
| 602 | * SUSv3 describes behaviour for count = 0 as following: |
| 603 | * "Before any action ... is taken, and if nbyte is zero |
| 604 | * and the file is a regular file, the write() function |
| 605 | * ... in the absence of errors ... shall return zero |
| 606 | * and have no other results." |
| 607 | */ |
| 608 | if (count) |
| 609 | *offset = uio->uio_offset; |
| 610 | } else |
| 611 | *offset += count - uio->uio_resid; |
| 612 | } |
| 613 | |
| 614 | out: |
| 615 | VOP_UNLOCK(vp); |
| 616 | return (error); |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * File table vnode stat routine. |
| 621 | */ |
| 622 | static int |
| 623 | vn_statfile(file_t *fp, struct stat *sb) |
| 624 | { |
| 625 | struct vnode *vp = fp->f_vnode; |
| 626 | int error; |
| 627 | |
| 628 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 629 | error = vn_stat(vp, sb); |
| 630 | VOP_UNLOCK(vp); |
| 631 | return error; |
| 632 | } |
| 633 | |
| 634 | int |
| 635 | vn_stat(struct vnode *vp, struct stat *sb) |
| 636 | { |
| 637 | struct vattr va; |
| 638 | int error; |
| 639 | mode_t mode; |
| 640 | |
| 641 | memset(&va, 0, sizeof(va)); |
| 642 | error = VOP_GETATTR(vp, &va, kauth_cred_get()); |
| 643 | if (error) |
| 644 | return (error); |
| 645 | /* |
| 646 | * Copy from vattr table |
| 647 | */ |
| 648 | memset(sb, 0, sizeof(*sb)); |
| 649 | sb->st_dev = va.va_fsid; |
| 650 | sb->st_ino = va.va_fileid; |
| 651 | mode = va.va_mode; |
| 652 | switch (vp->v_type) { |
| 653 | case VREG: |
| 654 | mode |= S_IFREG; |
| 655 | break; |
| 656 | case VDIR: |
| 657 | mode |= S_IFDIR; |
| 658 | break; |
| 659 | case VBLK: |
| 660 | mode |= S_IFBLK; |
| 661 | break; |
| 662 | case VCHR: |
| 663 | mode |= S_IFCHR; |
| 664 | break; |
| 665 | case VLNK: |
| 666 | mode |= S_IFLNK; |
| 667 | break; |
| 668 | case VSOCK: |
| 669 | mode |= S_IFSOCK; |
| 670 | break; |
| 671 | case VFIFO: |
| 672 | mode |= S_IFIFO; |
| 673 | break; |
| 674 | default: |
| 675 | return (EBADF); |
| 676 | } |
| 677 | sb->st_mode = mode; |
| 678 | sb->st_nlink = va.va_nlink; |
| 679 | sb->st_uid = va.va_uid; |
| 680 | sb->st_gid = va.va_gid; |
| 681 | sb->st_rdev = va.va_rdev; |
| 682 | sb->st_size = va.va_size; |
| 683 | sb->st_atimespec = va.va_atime; |
| 684 | sb->st_mtimespec = va.va_mtime; |
| 685 | sb->st_ctimespec = va.va_ctime; |
| 686 | sb->st_birthtimespec = va.va_birthtime; |
| 687 | sb->st_blksize = va.va_blocksize; |
| 688 | sb->st_flags = va.va_flags; |
| 689 | sb->st_gen = 0; |
| 690 | sb->st_blocks = va.va_bytes / S_BLKSIZE; |
| 691 | return (0); |
| 692 | } |
| 693 | |
| 694 | /* |
| 695 | * File table vnode fcntl routine. |
| 696 | */ |
| 697 | static int |
| 698 | vn_fcntl(file_t *fp, u_int com, void *data) |
| 699 | { |
| 700 | struct vnode *vp = fp->f_vnode; |
| 701 | int error; |
| 702 | |
| 703 | error = VOP_FCNTL(vp, com, data, fp->f_flag, kauth_cred_get()); |
| 704 | return (error); |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * File table vnode ioctl routine. |
| 709 | */ |
| 710 | static int |
| 711 | vn_ioctl(file_t *fp, u_long com, void *data) |
| 712 | { |
| 713 | struct vnode *vp = fp->f_vnode, *ovp; |
| 714 | struct vattr vattr; |
| 715 | int error; |
| 716 | |
| 717 | switch (vp->v_type) { |
| 718 | |
| 719 | case VREG: |
| 720 | case VDIR: |
| 721 | if (com == FIONREAD) { |
| 722 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 723 | error = VOP_GETATTR(vp, &vattr, kauth_cred_get()); |
| 724 | VOP_UNLOCK(vp); |
| 725 | if (error) |
| 726 | return (error); |
| 727 | *(int *)data = vattr.va_size - fp->f_offset; |
| 728 | return (0); |
| 729 | } |
| 730 | if ((com == FIONWRITE) || (com == FIONSPACE)) { |
| 731 | /* |
| 732 | * Files don't have send queues, so there never |
| 733 | * are any bytes in them, nor is there any |
| 734 | * open space in them. |
| 735 | */ |
| 736 | *(int *)data = 0; |
| 737 | return (0); |
| 738 | } |
| 739 | if (com == FIOGETBMAP) { |
| 740 | daddr_t *block; |
| 741 | |
| 742 | if (*(daddr_t *)data < 0) |
| 743 | return (EINVAL); |
| 744 | block = (daddr_t *)data; |
| 745 | return (VOP_BMAP(vp, *block, NULL, block, NULL)); |
| 746 | } |
| 747 | if (com == OFIOGETBMAP) { |
| 748 | daddr_t ibn, obn; |
| 749 | |
| 750 | if (*(int32_t *)data < 0) |
| 751 | return (EINVAL); |
| 752 | ibn = (daddr_t)*(int32_t *)data; |
| 753 | error = VOP_BMAP(vp, ibn, NULL, &obn, NULL); |
| 754 | *(int32_t *)data = (int32_t)obn; |
| 755 | return error; |
| 756 | } |
| 757 | if (com == FIONBIO || com == FIOASYNC) /* XXX */ |
| 758 | return (0); /* XXX */ |
| 759 | /* fall into ... */ |
| 760 | case VFIFO: |
| 761 | case VCHR: |
| 762 | case VBLK: |
| 763 | error = VOP_IOCTL(vp, com, data, fp->f_flag, |
| 764 | kauth_cred_get()); |
| 765 | if (error == 0 && com == TIOCSCTTY) { |
| 766 | vref(vp); |
| 767 | mutex_enter(proc_lock); |
| 768 | ovp = curproc->p_session->s_ttyvp; |
| 769 | curproc->p_session->s_ttyvp = vp; |
| 770 | mutex_exit(proc_lock); |
| 771 | if (ovp != NULL) |
| 772 | vrele(ovp); |
| 773 | } |
| 774 | return (error); |
| 775 | |
| 776 | default: |
| 777 | return (EPASSTHROUGH); |
| 778 | } |
| 779 | } |
| 780 | |
| 781 | /* |
| 782 | * File table vnode poll routine. |
| 783 | */ |
| 784 | static int |
| 785 | vn_poll(file_t *fp, int events) |
| 786 | { |
| 787 | |
| 788 | return (VOP_POLL(fp->f_vnode, events)); |
| 789 | } |
| 790 | |
| 791 | /* |
| 792 | * File table vnode kqfilter routine. |
| 793 | */ |
| 794 | int |
| 795 | vn_kqfilter(file_t *fp, struct knote *kn) |
| 796 | { |
| 797 | |
| 798 | return (VOP_KQFILTER(fp->f_vnode, kn)); |
| 799 | } |
| 800 | |
| 801 | static int |
| 802 | vn_mmap(struct file *fp, off_t *offp, size_t size, int prot, int *flagsp, |
| 803 | int *advicep, struct uvm_object **uobjp, int *maxprotp) |
| 804 | { |
| 805 | struct uvm_object *uobj; |
| 806 | struct vnode *vp; |
| 807 | struct vattr va; |
| 808 | struct lwp *l; |
| 809 | vm_prot_t maxprot; |
| 810 | off_t off; |
| 811 | int error, flags; |
| 812 | bool needwritemap; |
| 813 | |
| 814 | l = curlwp; |
| 815 | |
| 816 | off = *offp; |
| 817 | flags = *flagsp; |
| 818 | maxprot = VM_PROT_EXECUTE; |
| 819 | |
| 820 | vp = fp->f_vnode; |
| 821 | if (vp->v_type != VREG && vp->v_type != VCHR && |
| 822 | vp->v_type != VBLK) { |
| 823 | /* only REG/CHR/BLK support mmap */ |
| 824 | return ENODEV; |
| 825 | } |
| 826 | if (vp->v_type != VCHR && off < 0) { |
| 827 | return EINVAL; |
| 828 | } |
| 829 | if (vp->v_type != VCHR && (off_t)(off + size) < off) { |
| 830 | /* no offset wrapping */ |
| 831 | return EOVERFLOW; |
| 832 | } |
| 833 | |
| 834 | /* special case: catch SunOS style /dev/zero */ |
| 835 | if (vp->v_type == VCHR && |
| 836 | (vp->v_rdev == zerodev || COMPAT_ZERODEV(vp->v_rdev))) { |
| 837 | *uobjp = NULL; |
| 838 | *maxprotp = VM_PROT_ALL; |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Old programs may not select a specific sharing type, so |
| 844 | * default to an appropriate one. |
| 845 | * |
| 846 | * XXX: how does MAP_ANON fit in the picture? |
| 847 | */ |
| 848 | if ((flags & (MAP_SHARED|MAP_PRIVATE)) == 0) { |
| 849 | #if defined(DEBUG) |
| 850 | struct proc *p = l->l_proc; |
| 851 | printf("WARNING: defaulted mmap() share type to " |
| 852 | "%s (pid %d command %s)\n" , vp->v_type == VCHR ? |
| 853 | "MAP_SHARED" : "MAP_PRIVATE" , p->p_pid, |
| 854 | p->p_comm); |
| 855 | #endif |
| 856 | if (vp->v_type == VCHR) |
| 857 | flags |= MAP_SHARED; /* for a device */ |
| 858 | else |
| 859 | flags |= MAP_PRIVATE; /* for a file */ |
| 860 | } |
| 861 | |
| 862 | /* |
| 863 | * MAP_PRIVATE device mappings don't make sense (and aren't |
| 864 | * supported anyway). However, some programs rely on this, |
| 865 | * so just change it to MAP_SHARED. |
| 866 | */ |
| 867 | if (vp->v_type == VCHR && (flags & MAP_PRIVATE) != 0) { |
| 868 | flags = (flags & ~MAP_PRIVATE) | MAP_SHARED; |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * now check protection |
| 873 | */ |
| 874 | |
| 875 | /* check read access */ |
| 876 | if (fp->f_flag & FREAD) |
| 877 | maxprot |= VM_PROT_READ; |
| 878 | else if (prot & PROT_READ) { |
| 879 | return EACCES; |
| 880 | } |
| 881 | |
| 882 | /* check write access, shared case first */ |
| 883 | if (flags & MAP_SHARED) { |
| 884 | /* |
| 885 | * if the file is writable, only add PROT_WRITE to |
| 886 | * maxprot if the file is not immutable, append-only. |
| 887 | * otherwise, if we have asked for PROT_WRITE, return |
| 888 | * EPERM. |
| 889 | */ |
| 890 | if (fp->f_flag & FWRITE) { |
| 891 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 892 | error = VOP_GETATTR(vp, &va, l->l_cred); |
| 893 | VOP_UNLOCK(vp); |
| 894 | if (error) { |
| 895 | return error; |
| 896 | } |
| 897 | if ((va.va_flags & |
| 898 | (SF_SNAPSHOT|IMMUTABLE|APPEND)) == 0) |
| 899 | maxprot |= VM_PROT_WRITE; |
| 900 | else if (prot & PROT_WRITE) { |
| 901 | return EPERM; |
| 902 | } |
| 903 | } else if (prot & PROT_WRITE) { |
| 904 | return EACCES; |
| 905 | } |
| 906 | } else { |
| 907 | /* MAP_PRIVATE mappings can always write to */ |
| 908 | maxprot |= VM_PROT_WRITE; |
| 909 | } |
| 910 | |
| 911 | /* |
| 912 | * Don't allow mmap for EXEC if the file system |
| 913 | * is mounted NOEXEC. |
| 914 | */ |
| 915 | if ((prot & PROT_EXEC) != 0 && |
| 916 | (vp->v_mount->mnt_flag & MNT_NOEXEC) != 0) { |
| 917 | return EACCES; |
| 918 | } |
| 919 | |
| 920 | if (vp->v_type != VCHR) { |
| 921 | error = VOP_MMAP(vp, prot, curlwp->l_cred); |
| 922 | if (error) { |
| 923 | return error; |
| 924 | } |
| 925 | vref(vp); |
| 926 | uobj = &vp->v_uobj; |
| 927 | |
| 928 | /* |
| 929 | * If the vnode is being mapped with PROT_EXEC, |
| 930 | * then mark it as text. |
| 931 | */ |
| 932 | if (prot & PROT_EXEC) { |
| 933 | vn_markexec(vp); |
| 934 | } |
| 935 | } else { |
| 936 | int i = maxprot; |
| 937 | |
| 938 | /* |
| 939 | * XXX Some devices don't like to be mapped with |
| 940 | * XXX PROT_EXEC or PROT_WRITE, but we don't really |
| 941 | * XXX have a better way of handling this, right now |
| 942 | */ |
| 943 | do { |
| 944 | uobj = udv_attach(vp->v_rdev, |
| 945 | (flags & MAP_SHARED) ? i : |
| 946 | (i & ~VM_PROT_WRITE), off, size); |
| 947 | i--; |
| 948 | } while ((uobj == NULL) && (i > 0)); |
| 949 | if (uobj == NULL) { |
| 950 | return EINVAL; |
| 951 | } |
| 952 | *advicep = UVM_ADV_RANDOM; |
| 953 | } |
| 954 | |
| 955 | /* |
| 956 | * Set vnode flags to indicate the new kinds of mapping. |
| 957 | * We take the vnode lock in exclusive mode here to serialize |
| 958 | * with direct I/O. |
| 959 | * |
| 960 | * Safe to check for these flag values without a lock, as |
| 961 | * long as a reference to the vnode is held. |
| 962 | */ |
| 963 | needwritemap = (vp->v_iflag & VI_WRMAP) == 0 && |
| 964 | (flags & MAP_SHARED) != 0 && |
| 965 | (maxprot & VM_PROT_WRITE) != 0; |
| 966 | if ((vp->v_vflag & VV_MAPPED) == 0 || needwritemap) { |
| 967 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 968 | vp->v_vflag |= VV_MAPPED; |
| 969 | if (needwritemap) { |
| 970 | mutex_enter(vp->v_interlock); |
| 971 | vp->v_iflag |= VI_WRMAP; |
| 972 | mutex_exit(vp->v_interlock); |
| 973 | } |
| 974 | VOP_UNLOCK(vp); |
| 975 | } |
| 976 | |
| 977 | #if NVERIEXEC > 0 |
| 978 | |
| 979 | /* |
| 980 | * Check if the file can be executed indirectly. |
| 981 | * |
| 982 | * XXX: This gives false warnings about "Incorrect access type" |
| 983 | * XXX: if the mapping is not executable. Harmless, but will be |
| 984 | * XXX: fixed as part of other changes. |
| 985 | */ |
| 986 | if (veriexec_verify(l, vp, "(mmap)" , VERIEXEC_INDIRECT, |
| 987 | NULL)) { |
| 988 | |
| 989 | /* |
| 990 | * Don't allow executable mappings if we can't |
| 991 | * indirectly execute the file. |
| 992 | */ |
| 993 | if (prot & VM_PROT_EXECUTE) { |
| 994 | return EPERM; |
| 995 | } |
| 996 | |
| 997 | /* |
| 998 | * Strip the executable bit from 'maxprot' to make sure |
| 999 | * it can't be made executable later. |
| 1000 | */ |
| 1001 | maxprot &= ~VM_PROT_EXECUTE; |
| 1002 | } |
| 1003 | #endif /* NVERIEXEC > 0 */ |
| 1004 | |
| 1005 | *uobjp = uobj; |
| 1006 | *maxprotp = maxprot; |
| 1007 | *flagsp = flags; |
| 1008 | |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
| 1012 | |
| 1013 | |
| 1014 | /* |
| 1015 | * Check that the vnode is still valid, and if so |
| 1016 | * acquire requested lock. |
| 1017 | */ |
| 1018 | int |
| 1019 | vn_lock(struct vnode *vp, int flags) |
| 1020 | { |
| 1021 | int error; |
| 1022 | |
| 1023 | #if 0 |
| 1024 | KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0); |
| 1025 | #endif |
| 1026 | KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0); |
| 1027 | KASSERT(!mutex_owned(vp->v_interlock)); |
| 1028 | |
| 1029 | #ifdef DIAGNOSTIC |
| 1030 | if (wapbl_vphaswapbl(vp)) |
| 1031 | WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp)); |
| 1032 | #endif |
| 1033 | |
| 1034 | error = VOP_LOCK(vp, flags); |
| 1035 | if ((flags & LK_RETRY) != 0 && error == ENOENT) |
| 1036 | error = VOP_LOCK(vp, flags); |
| 1037 | |
| 1038 | KASSERT((flags & LK_RETRY) == 0 || (flags & LK_NOWAIT) != 0 || |
| 1039 | error == 0); |
| 1040 | |
| 1041 | return error; |
| 1042 | } |
| 1043 | |
| 1044 | /* |
| 1045 | * File table vnode close routine. |
| 1046 | */ |
| 1047 | static int |
| 1048 | vn_closefile(file_t *fp) |
| 1049 | { |
| 1050 | |
| 1051 | return vn_close(fp->f_vnode, fp->f_flag, fp->f_cred); |
| 1052 | } |
| 1053 | |
| 1054 | /* |
| 1055 | * Simplified in-kernel wrapper calls for extended attribute access. |
| 1056 | * Both calls pass in a NULL credential, authorizing a "kernel" access. |
| 1057 | * Set IO_NODELOCKED in ioflg if the vnode is already locked. |
| 1058 | */ |
| 1059 | int |
| 1060 | vn_extattr_get(struct vnode *vp, int ioflg, int attrnamespace, |
| 1061 | const char *attrname, size_t *buflen, void *bf, struct lwp *l) |
| 1062 | { |
| 1063 | struct uio auio; |
| 1064 | struct iovec aiov; |
| 1065 | int error; |
| 1066 | |
| 1067 | aiov.iov_len = *buflen; |
| 1068 | aiov.iov_base = bf; |
| 1069 | |
| 1070 | auio.uio_iov = &aiov; |
| 1071 | auio.uio_iovcnt = 1; |
| 1072 | auio.uio_rw = UIO_READ; |
| 1073 | auio.uio_offset = 0; |
| 1074 | auio.uio_resid = *buflen; |
| 1075 | UIO_SETUP_SYSSPACE(&auio); |
| 1076 | |
| 1077 | if ((ioflg & IO_NODELOCKED) == 0) |
| 1078 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 1079 | |
| 1080 | error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio, NULL, NULL); |
| 1081 | |
| 1082 | if ((ioflg & IO_NODELOCKED) == 0) |
| 1083 | VOP_UNLOCK(vp); |
| 1084 | |
| 1085 | if (error == 0) |
| 1086 | *buflen = *buflen - auio.uio_resid; |
| 1087 | |
| 1088 | return (error); |
| 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * XXX Failure mode if partially written? |
| 1093 | */ |
| 1094 | int |
| 1095 | vn_extattr_set(struct vnode *vp, int ioflg, int attrnamespace, |
| 1096 | const char *attrname, size_t buflen, const void *bf, struct lwp *l) |
| 1097 | { |
| 1098 | struct uio auio; |
| 1099 | struct iovec aiov; |
| 1100 | int error; |
| 1101 | |
| 1102 | aiov.iov_len = buflen; |
| 1103 | aiov.iov_base = __UNCONST(bf); /* XXXUNCONST kills const */ |
| 1104 | |
| 1105 | auio.uio_iov = &aiov; |
| 1106 | auio.uio_iovcnt = 1; |
| 1107 | auio.uio_rw = UIO_WRITE; |
| 1108 | auio.uio_offset = 0; |
| 1109 | auio.uio_resid = buflen; |
| 1110 | UIO_SETUP_SYSSPACE(&auio); |
| 1111 | |
| 1112 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 1113 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 1114 | } |
| 1115 | |
| 1116 | error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio, NULL); |
| 1117 | |
| 1118 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 1119 | VOP_UNLOCK(vp); |
| 1120 | } |
| 1121 | |
| 1122 | return (error); |
| 1123 | } |
| 1124 | |
| 1125 | int |
| 1126 | vn_extattr_rm(struct vnode *vp, int ioflg, int attrnamespace, |
| 1127 | const char *attrname, struct lwp *l) |
| 1128 | { |
| 1129 | int error; |
| 1130 | |
| 1131 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 1132 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 1133 | } |
| 1134 | |
| 1135 | error = VOP_DELETEEXTATTR(vp, attrnamespace, attrname, NULL); |
| 1136 | if (error == EOPNOTSUPP) |
| 1137 | error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL, NULL); |
| 1138 | |
| 1139 | if ((ioflg & IO_NODELOCKED) == 0) { |
| 1140 | VOP_UNLOCK(vp); |
| 1141 | } |
| 1142 | |
| 1143 | return (error); |
| 1144 | } |
| 1145 | |
| 1146 | void |
| 1147 | vn_ra_allocctx(struct vnode *vp) |
| 1148 | { |
| 1149 | struct uvm_ractx *ra = NULL; |
| 1150 | |
| 1151 | KASSERT(mutex_owned(vp->v_interlock)); |
| 1152 | |
| 1153 | if (vp->v_type != VREG) { |
| 1154 | return; |
| 1155 | } |
| 1156 | if (vp->v_ractx != NULL) { |
| 1157 | return; |
| 1158 | } |
| 1159 | if (vp->v_ractx == NULL) { |
| 1160 | mutex_exit(vp->v_interlock); |
| 1161 | ra = uvm_ra_allocctx(); |
| 1162 | mutex_enter(vp->v_interlock); |
| 1163 | if (ra != NULL && vp->v_ractx == NULL) { |
| 1164 | vp->v_ractx = ra; |
| 1165 | ra = NULL; |
| 1166 | } |
| 1167 | } |
| 1168 | if (ra != NULL) { |
| 1169 | uvm_ra_freectx(ra); |
| 1170 | } |
| 1171 | } |
| 1172 | |
| 1173 | int |
| 1174 | vn_fifo_bypass(void *v) |
| 1175 | { |
| 1176 | struct vop_generic_args *ap = v; |
| 1177 | |
| 1178 | return VOCALL(fifo_vnodeop_p, ap->a_desc->vdesc_offset, v); |
| 1179 | } |
| 1180 | |