| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * (c) UNIX System Laboratories, Inc. |
| 5 | * All or some portions of this file are derived from material licensed |
| 6 | * to the University of California by American Telephone and Telegraph |
| 7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with |
| 8 | * the permission of UNIX System Laboratories, Inc. |
| 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 University of |
| 21 | * California, Berkeley and its contributors. |
| 22 | * 4. Neither the name of the University nor the names of its contributors |
| 23 | * may be used to endorse or promote products derived from this software |
| 24 | * without specific prior written permission. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 27 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 30 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 31 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 32 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 33 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 34 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 35 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 36 | * SUCH DAMAGE. |
| 37 | * |
| 38 | * @(#)vfs_vnops.c 8.2 (Berkeley) 1/21/94 |
| 39 | * $FreeBSD: src/sys/kern/vfs_vnops.c,v 1.87.2.13 2002/12/29 18:19:53 dillon Exp $ |
| 40 | * $DragonFly: src/sys/kern/vfs_vnops.c,v 1.58 2008/06/28 17:59:49 dillon Exp $ |
| 41 | */ |
| 42 | |
| 43 | #include <sys/param.h> |
| 44 | #include <sys/systm.h> |
| 45 | #include <sys/fcntl.h> |
| 46 | #include <sys/file.h> |
| 47 | #include <sys/stat.h> |
| 48 | #include <sys/proc.h> |
| 49 | #include <sys/priv.h> |
| 50 | #include <sys/mount.h> |
| 51 | #include <sys/nlookup.h> |
| 52 | #include <sys/vnode.h> |
| 53 | #include <sys/buf.h> |
| 54 | #include <sys/filio.h> |
| 55 | #include <sys/ttycom.h> |
| 56 | #include <sys/conf.h> |
| 57 | #include <sys/syslog.h> |
| 58 | |
| 59 | static int vn_closefile (struct file *fp); |
| 60 | static int vn_ioctl (struct file *fp, u_long com, caddr_t data, |
| 61 | struct ucred *cred); |
| 62 | static int vn_read (struct file *fp, struct uio *uio, |
| 63 | struct ucred *cred, int flags); |
| 64 | static int svn_read (struct file *fp, struct uio *uio, |
| 65 | struct ucred *cred, int flags); |
| 66 | static int vn_poll (struct file *fp, int events, struct ucred *cred); |
| 67 | static int vn_kqfilter (struct file *fp, struct knote *kn); |
| 68 | static int vn_statfile (struct file *fp, struct stat *sb, struct ucred *cred); |
| 69 | static int vn_write (struct file *fp, struct uio *uio, |
| 70 | struct ucred *cred, int flags); |
| 71 | static int svn_write (struct file *fp, struct uio *uio, |
| 72 | struct ucred *cred, int flags); |
| 73 | |
| 74 | struct fileops vnode_fileops = { |
| 75 | .fo_read = vn_read, |
| 76 | .fo_write = vn_write, |
| 77 | .fo_ioctl = vn_ioctl, |
| 78 | .fo_poll = vn_poll, |
| 79 | .fo_kqfilter = vn_kqfilter, |
| 80 | .fo_stat = vn_statfile, |
| 81 | .fo_close = vn_closefile, |
| 82 | .fo_shutdown = nofo_shutdown |
| 83 | }; |
| 84 | |
| 85 | struct fileops specvnode_fileops = { |
| 86 | .fo_read = svn_read, |
| 87 | .fo_write = svn_write, |
| 88 | .fo_ioctl = vn_ioctl, |
| 89 | .fo_poll = vn_poll, |
| 90 | .fo_kqfilter = vn_kqfilter, |
| 91 | .fo_stat = vn_statfile, |
| 92 | .fo_close = vn_closefile, |
| 93 | .fo_shutdown = nofo_shutdown |
| 94 | }; |
| 95 | |
| 96 | /* |
| 97 | * Shortcut the device read/write. This avoids a lot of vnode junk. |
| 98 | * Basically the specfs vnops for read and write take the locked vnode, |
| 99 | * unlock it (because we can't hold the vnode locked while reading or writing |
| 100 | * a device which may block indefinitely), issues the device operation, then |
| 101 | * relock the vnode before returning, plus other junk. This bypasses all |
| 102 | * of that and just does the device operation. |
| 103 | */ |
| 104 | void |
| 105 | vn_setspecops(struct file *fp) |
| 106 | { |
| 107 | if (vfs_fastdev && fp->f_ops == &vnode_fileops) { |
| 108 | fp->f_ops = &specvnode_fileops; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Common code for vnode open operations. Check permissions, and call |
| 114 | * the VOP_NOPEN or VOP_NCREATE routine. |
| 115 | * |
| 116 | * The caller is responsible for setting up nd with nlookup_init() and |
| 117 | * for cleaning it up with nlookup_done(), whether we return an error |
| 118 | * or not. |
| 119 | * |
| 120 | * On success nd->nl_open_vp will hold a referenced and, if requested, |
| 121 | * locked vnode. A locked vnode is requested via NLC_LOCKVP. If fp |
| 122 | * is non-NULL the vnode will be installed in the file pointer. |
| 123 | * |
| 124 | * NOTE: The vnode is referenced just once on return whether or not it |
| 125 | * is also installed in the file pointer. |
| 126 | */ |
| 127 | int |
| 128 | vn_open(struct nlookupdata *nd, struct file *fp, int fmode, int cmode) |
| 129 | { |
| 130 | struct vnode *vp; |
| 131 | struct ucred *cred = nd->nl_cred; |
| 132 | struct vattr vat; |
| 133 | struct vattr *vap = &vat; |
| 134 | int error; |
| 135 | |
| 136 | /* |
| 137 | * Lookup the path and create or obtain the vnode. After a |
| 138 | * successful lookup a locked nd->nl_nch will be returned. |
| 139 | * |
| 140 | * The result of this section should be a locked vnode. |
| 141 | * |
| 142 | * XXX with only a little work we should be able to avoid locking |
| 143 | * the vnode if FWRITE, O_CREAT, and O_TRUNC are *not* set. |
| 144 | */ |
| 145 | nd->nl_flags |= NLC_OPEN; |
| 146 | if (fmode & O_APPEND) |
| 147 | nd->nl_flags |= NLC_APPEND; |
| 148 | if (fmode & O_TRUNC) |
| 149 | nd->nl_flags |= NLC_TRUNCATE; |
| 150 | if (fmode & FREAD) |
| 151 | nd->nl_flags |= NLC_READ; |
| 152 | if (fmode & FWRITE) |
| 153 | nd->nl_flags |= NLC_WRITE; |
| 154 | |
| 155 | if (fmode & O_CREAT) { |
| 156 | /* |
| 157 | * CONDITIONAL CREATE FILE CASE |
| 158 | * |
| 159 | * Setting NLC_CREATE causes a negative hit to store |
| 160 | * the negative hit ncp and not return an error. Then |
| 161 | * nc_error or nc_vp may be checked to see if the ncp |
| 162 | * represents a negative hit. NLC_CREATE also requires |
| 163 | * write permission on the governing directory or EPERM |
| 164 | * is returned. |
| 165 | */ |
| 166 | if ((fmode & O_EXCL) == 0 && (fmode & O_NOFOLLOW) == 0) |
| 167 | nd->nl_flags |= NLC_FOLLOW; |
| 168 | nd->nl_flags |= NLC_CREATE; |
| 169 | nd->nl_flags |= NLC_REFDVP; |
| 170 | bwillinode(1); |
| 171 | error = nlookup(nd); |
| 172 | } else { |
| 173 | /* |
| 174 | * NORMAL OPEN FILE CASE |
| 175 | */ |
| 176 | error = nlookup(nd); |
| 177 | } |
| 178 | |
| 179 | if (error) |
| 180 | return (error); |
| 181 | |
| 182 | /* |
| 183 | * split case to allow us to re-resolve and retry the ncp in case |
| 184 | * we get ESTALE. |
| 185 | */ |
| 186 | again: |
| 187 | if (fmode & O_CREAT) { |
| 188 | if (nd->nl_nch.ncp->nc_vp == NULL) { |
| 189 | if ((error = ncp_writechk(&nd->nl_nch)) != 0) |
| 190 | return (error); |
| 191 | VATTR_NULL(vap); |
| 192 | vap->va_type = VREG; |
| 193 | vap->va_mode = cmode; |
| 194 | if (fmode & O_EXCL) |
| 195 | vap->va_vaflags |= VA_EXCLUSIVE; |
| 196 | error = VOP_NCREATE(&nd->nl_nch, nd->nl_dvp, &vp, |
| 197 | nd->nl_cred, vap); |
| 198 | if (error) |
| 199 | return (error); |
| 200 | fmode &= ~O_TRUNC; |
| 201 | /* locked vnode is returned */ |
| 202 | } else { |
| 203 | if (fmode & O_EXCL) { |
| 204 | error = EEXIST; |
| 205 | } else { |
| 206 | error = cache_vget(&nd->nl_nch, cred, |
| 207 | LK_EXCLUSIVE, &vp); |
| 208 | } |
| 209 | if (error) |
| 210 | return (error); |
| 211 | fmode &= ~O_CREAT; |
| 212 | } |
| 213 | } else { |
| 214 | error = cache_vget(&nd->nl_nch, cred, LK_EXCLUSIVE, &vp); |
| 215 | if (error) |
| 216 | return (error); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * We have a locked vnode and ncp now. Note that the ncp will |
| 221 | * be cleaned up by the caller if nd->nl_nch is left intact. |
| 222 | */ |
| 223 | if (vp->v_type == VLNK) { |
| 224 | error = EMLINK; |
| 225 | goto bad; |
| 226 | } |
| 227 | if (vp->v_type == VSOCK) { |
| 228 | error = EOPNOTSUPP; |
| 229 | goto bad; |
| 230 | } |
| 231 | if ((fmode & O_CREAT) == 0) { |
| 232 | if (fmode & (FWRITE | O_TRUNC)) { |
| 233 | if (vp->v_type == VDIR) { |
| 234 | error = EISDIR; |
| 235 | goto bad; |
| 236 | } |
| 237 | error = vn_writechk(vp, &nd->nl_nch); |
| 238 | if (error) { |
| 239 | /* |
| 240 | * Special stale handling, re-resolve the |
| 241 | * vnode. |
| 242 | */ |
| 243 | if (error == ESTALE) { |
| 244 | vput(vp); |
| 245 | vp = NULL; |
| 246 | cache_setunresolved(&nd->nl_nch); |
| 247 | error = cache_resolve(&nd->nl_nch, cred); |
| 248 | if (error == 0) |
| 249 | goto again; |
| 250 | } |
| 251 | goto bad; |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | if (fmode & O_TRUNC) { |
| 256 | vn_unlock(vp); /* XXX */ |
| 257 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); /* XXX */ |
| 258 | VATTR_NULL(vap); |
| 259 | vap->va_size = 0; |
| 260 | error = VOP_SETATTR(vp, vap, cred); |
| 261 | if (error) |
| 262 | goto bad; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Setup the fp so VOP_OPEN can override it. No descriptor has been |
| 267 | * associated with the fp yet so we own it clean. |
| 268 | * |
| 269 | * f_nchandle inherits nl_nch. This used to be necessary only for |
| 270 | * directories but now we do it unconditionally so f*() ops |
| 271 | * such as fchmod() can access the actual namespace that was |
| 272 | * used to open the file. |
| 273 | */ |
| 274 | if (fp) { |
| 275 | if (nd->nl_flags & NLC_APPENDONLY) |
| 276 | fmode |= FAPPENDONLY; |
| 277 | fp->f_nchandle = nd->nl_nch; |
| 278 | cache_zero(&nd->nl_nch); |
| 279 | cache_unlock(&fp->f_nchandle); |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Get rid of nl_nch. vn_open does not return it (it returns the |
| 284 | * vnode or the file pointer). Note: we can't leave nl_nch locked |
| 285 | * through the VOP_OPEN anyway since the VOP_OPEN may block, e.g. |
| 286 | * on /dev/ttyd0 |
| 287 | */ |
| 288 | if (nd->nl_nch.ncp) |
| 289 | cache_put(&nd->nl_nch); |
| 290 | |
| 291 | error = VOP_OPEN(vp, fmode, cred, fp); |
| 292 | if (error) { |
| 293 | /* |
| 294 | * setting f_ops to &badfileops will prevent the descriptor |
| 295 | * code from trying to close and release the vnode, since |
| 296 | * the open failed we do not want to call close. |
| 297 | */ |
| 298 | if (fp) { |
| 299 | fp->f_data = NULL; |
| 300 | fp->f_ops = &badfileops; |
| 301 | } |
| 302 | goto bad; |
| 303 | } |
| 304 | |
| 305 | #if 0 |
| 306 | /* |
| 307 | * Assert that VREG files have been setup for vmio. |
| 308 | */ |
| 309 | KASSERT(vp->v_type != VREG || vp->v_object != NULL, |
| 310 | ("vn_open: regular file was not VMIO enabled!")); |
| 311 | #endif |
| 312 | |
| 313 | /* |
| 314 | * Return the vnode. XXX needs some cleaning up. The vnode is |
| 315 | * only returned in the fp == NULL case. |
| 316 | */ |
| 317 | if (fp == NULL) { |
| 318 | nd->nl_open_vp = vp; |
| 319 | nd->nl_vp_fmode = fmode; |
| 320 | if ((nd->nl_flags & NLC_LOCKVP) == 0) |
| 321 | vn_unlock(vp); |
| 322 | } else { |
| 323 | vput(vp); |
| 324 | } |
| 325 | return (0); |
| 326 | bad: |
| 327 | if (vp) |
| 328 | vput(vp); |
| 329 | return (error); |
| 330 | } |
| 331 | |
| 332 | int |
| 333 | vn_opendisk(const char *devname, int fmode, struct vnode **vpp) |
| 334 | { |
| 335 | struct vnode *vp; |
| 336 | int error; |
| 337 | |
| 338 | if (strncmp(devname, "/dev/", 5) == 0) |
| 339 | devname += 5; |
| 340 | if ((vp = getsynthvnode(devname)) == NULL) { |
| 341 | error = ENODEV; |
| 342 | } else { |
| 343 | error = VOP_OPEN(vp, fmode, proc0.p_ucred, NULL); |
| 344 | vn_unlock(vp); |
| 345 | if (error) { |
| 346 | vrele(vp); |
| 347 | vp = NULL; |
| 348 | } |
| 349 | } |
| 350 | *vpp = vp; |
| 351 | return (error); |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * Check for write permissions on the specified vnode. nch may be NULL. |
| 356 | */ |
| 357 | int |
| 358 | vn_writechk(struct vnode *vp, struct nchandle *nch) |
| 359 | { |
| 360 | /* |
| 361 | * If there's shared text associated with |
| 362 | * the vnode, try to free it up once. If |
| 363 | * we fail, we can't allow writing. |
| 364 | */ |
| 365 | if (vp->v_flag & VTEXT) |
| 366 | return (ETXTBSY); |
| 367 | |
| 368 | /* |
| 369 | * If the vnode represents a regular file, check the mount |
| 370 | * point via the nch. This may be a different mount point |
| 371 | * then the one embedded in the vnode (e.g. nullfs). |
| 372 | * |
| 373 | * We can still write to non-regular files (e.g. devices) |
| 374 | * via read-only mounts. |
| 375 | */ |
| 376 | if (nch && nch->ncp && vp->v_type == VREG) |
| 377 | return (ncp_writechk(nch)); |
| 378 | return (0); |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Check whether the underlying mount is read-only. The mount point |
| 383 | * referenced by the namecache may be different from the mount point |
| 384 | * used by the underlying vnode in the case of NULLFS, so a separate |
| 385 | * check is needed. |
| 386 | */ |
| 387 | int |
| 388 | ncp_writechk(struct nchandle *nch) |
| 389 | { |
| 390 | if (nch->mount && (nch->mount->mnt_flag & MNT_RDONLY)) |
| 391 | return (EROFS); |
| 392 | return(0); |
| 393 | } |
| 394 | |
| 395 | /* |
| 396 | * Vnode close call |
| 397 | */ |
| 398 | int |
| 399 | vn_close(struct vnode *vp, int flags) |
| 400 | { |
| 401 | int error; |
| 402 | |
| 403 | error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 404 | if (error == 0) { |
| 405 | error = VOP_CLOSE(vp, flags); |
| 406 | vn_unlock(vp); |
| 407 | } |
| 408 | vrele(vp); |
| 409 | return (error); |
| 410 | } |
| 411 | |
| 412 | static __inline |
| 413 | int |
| 414 | sequential_heuristic(struct uio *uio, struct file *fp) |
| 415 | { |
| 416 | /* |
| 417 | * Sequential heuristic - detect sequential operation |
| 418 | */ |
| 419 | if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || |
| 420 | uio->uio_offset == fp->f_nextoff) { |
| 421 | int tmpseq = fp->f_seqcount; |
| 422 | /* |
| 423 | * XXX we assume that the filesystem block size is |
| 424 | * the default. Not true, but still gives us a pretty |
| 425 | * good indicator of how sequential the read operations |
| 426 | * are. |
| 427 | */ |
| 428 | tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; |
| 429 | if (tmpseq > IO_SEQMAX) |
| 430 | tmpseq = IO_SEQMAX; |
| 431 | fp->f_seqcount = tmpseq; |
| 432 | return(fp->f_seqcount << IO_SEQSHIFT); |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Not sequential, quick draw-down of seqcount |
| 437 | */ |
| 438 | if (fp->f_seqcount > 1) |
| 439 | fp->f_seqcount = 1; |
| 440 | else |
| 441 | fp->f_seqcount = 0; |
| 442 | return(0); |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Package up an I/O request on a vnode into a uio and do it. |
| 447 | */ |
| 448 | int |
| 449 | vn_rdwr(enum uio_rw rw, struct vnode *vp, caddr_t base, int len, |
| 450 | off_t offset, enum uio_seg segflg, int ioflg, |
| 451 | struct ucred *cred, int *aresid) |
| 452 | { |
| 453 | struct uio auio; |
| 454 | struct iovec aiov; |
| 455 | struct ccms_lock ccms_lock; |
| 456 | int error; |
| 457 | |
| 458 | if ((ioflg & IO_NODELOCKED) == 0) |
| 459 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 460 | auio.uio_iov = &aiov; |
| 461 | auio.uio_iovcnt = 1; |
| 462 | aiov.iov_base = base; |
| 463 | aiov.iov_len = len; |
| 464 | auio.uio_resid = len; |
| 465 | auio.uio_offset = offset; |
| 466 | auio.uio_segflg = segflg; |
| 467 | auio.uio_rw = rw; |
| 468 | auio.uio_td = curthread; |
| 469 | ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, &auio); |
| 470 | if (rw == UIO_READ) { |
| 471 | error = VOP_READ(vp, &auio, ioflg, cred); |
| 472 | } else { |
| 473 | error = VOP_WRITE(vp, &auio, ioflg, cred); |
| 474 | } |
| 475 | ccms_lock_put(&vp->v_ccms, &ccms_lock); |
| 476 | if (aresid) |
| 477 | *aresid = auio.uio_resid; |
| 478 | else |
| 479 | if (auio.uio_resid && error == 0) |
| 480 | error = EIO; |
| 481 | if ((ioflg & IO_NODELOCKED) == 0) |
| 482 | vn_unlock(vp); |
| 483 | return (error); |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Package up an I/O request on a vnode into a uio and do it. The I/O |
| 488 | * request is split up into smaller chunks and we try to avoid saturating |
| 489 | * the buffer cache while potentially holding a vnode locked, so we |
| 490 | * check bwillwrite() before calling vn_rdwr(). We also call uio_yield() |
| 491 | * to give other processes a chance to lock the vnode (either other processes |
| 492 | * core'ing the same binary, or unrelated processes scanning the directory). |
| 493 | */ |
| 494 | int |
| 495 | vn_rdwr_inchunks(enum uio_rw rw, struct vnode *vp, caddr_t base, int len, |
| 496 | off_t offset, enum uio_seg segflg, int ioflg, |
| 497 | struct ucred *cred, int *aresid) |
| 498 | { |
| 499 | int error = 0; |
| 500 | |
| 501 | do { |
| 502 | int chunk; |
| 503 | |
| 504 | /* |
| 505 | * Force `offset' to a multiple of MAXBSIZE except possibly |
| 506 | * for the first chunk, so that filesystems only need to |
| 507 | * write full blocks except possibly for the first and last |
| 508 | * chunks. |
| 509 | */ |
| 510 | chunk = MAXBSIZE - (uoff_t)offset % MAXBSIZE; |
| 511 | |
| 512 | if (chunk > len) |
| 513 | chunk = len; |
| 514 | if (vp->v_type == VREG) { |
| 515 | switch(rw) { |
| 516 | case UIO_READ: |
| 517 | bwillread(chunk); |
| 518 | break; |
| 519 | case UIO_WRITE: |
| 520 | bwillwrite(chunk); |
| 521 | break; |
| 522 | } |
| 523 | } |
| 524 | error = vn_rdwr(rw, vp, base, chunk, offset, segflg, |
| 525 | ioflg, cred, aresid); |
| 526 | len -= chunk; /* aresid calc already includes length */ |
| 527 | if (error) |
| 528 | break; |
| 529 | offset += chunk; |
| 530 | base += chunk; |
| 531 | uio_yield(); |
| 532 | } while (len); |
| 533 | if (aresid) |
| 534 | *aresid += len; |
| 535 | return (error); |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * MPALMOSTSAFE - acquires mplock |
| 540 | */ |
| 541 | static int |
| 542 | vn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags) |
| 543 | { |
| 544 | struct ccms_lock ccms_lock; |
| 545 | struct vnode *vp; |
| 546 | int error, ioflag; |
| 547 | |
| 548 | get_mplock(); |
| 549 | KASSERT(uio->uio_td == curthread, |
| 550 | ("uio_td %p is not td %p", uio->uio_td, curthread)); |
| 551 | vp = (struct vnode *)fp->f_data; |
| 552 | |
| 553 | ioflag = 0; |
| 554 | if (flags & O_FBLOCKING) { |
| 555 | /* ioflag &= ~IO_NDELAY; */ |
| 556 | } else if (flags & O_FNONBLOCKING) { |
| 557 | ioflag |= IO_NDELAY; |
| 558 | } else if (fp->f_flag & FNONBLOCK) { |
| 559 | ioflag |= IO_NDELAY; |
| 560 | } |
| 561 | if (flags & O_FBUFFERED) { |
| 562 | /* ioflag &= ~IO_DIRECT; */ |
| 563 | } else if (flags & O_FUNBUFFERED) { |
| 564 | ioflag |= IO_DIRECT; |
| 565 | } else if (fp->f_flag & O_DIRECT) { |
| 566 | ioflag |= IO_DIRECT; |
| 567 | } |
| 568 | vn_lock(vp, LK_SHARED | LK_RETRY); |
| 569 | if ((flags & O_FOFFSET) == 0) |
| 570 | uio->uio_offset = fp->f_offset; |
| 571 | ioflag |= sequential_heuristic(uio, fp); |
| 572 | |
| 573 | ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio); |
| 574 | error = VOP_READ(vp, uio, ioflag, cred); |
| 575 | ccms_lock_put(&vp->v_ccms, &ccms_lock); |
| 576 | if ((flags & O_FOFFSET) == 0) |
| 577 | fp->f_offset = uio->uio_offset; |
| 578 | fp->f_nextoff = uio->uio_offset; |
| 579 | vn_unlock(vp); |
| 580 | rel_mplock(); |
| 581 | return (error); |
| 582 | } |
| 583 | |
| 584 | /* |
| 585 | * Device-optimized file table vnode read routine. |
| 586 | * |
| 587 | * This bypasses the VOP table and talks directly to the device. Most |
| 588 | * filesystems just route to specfs and can make this optimization. |
| 589 | * |
| 590 | * MPALMOSTSAFE - acquires mplock |
| 591 | */ |
| 592 | static int |
| 593 | svn_read(struct file *fp, struct uio *uio, struct ucred *cred, int flags) |
| 594 | { |
| 595 | struct vnode *vp; |
| 596 | int ioflag; |
| 597 | int error; |
| 598 | cdev_t dev; |
| 599 | |
| 600 | get_mplock(); |
| 601 | KASSERT(uio->uio_td == curthread, |
| 602 | ("uio_td %p is not td %p", uio->uio_td, curthread)); |
| 603 | |
| 604 | vp = (struct vnode *)fp->f_data; |
| 605 | if (vp == NULL || vp->v_type == VBAD) { |
| 606 | error = EBADF; |
| 607 | goto done; |
| 608 | } |
| 609 | |
| 610 | if ((dev = vp->v_rdev) == NULL) { |
| 611 | error = EBADF; |
| 612 | goto done; |
| 613 | } |
| 614 | reference_dev(dev); |
| 615 | |
| 616 | if (uio->uio_resid == 0) { |
| 617 | error = 0; |
| 618 | goto done; |
| 619 | } |
| 620 | if ((flags & O_FOFFSET) == 0) |
| 621 | uio->uio_offset = fp->f_offset; |
| 622 | |
| 623 | ioflag = 0; |
| 624 | if (flags & O_FBLOCKING) { |
| 625 | /* ioflag &= ~IO_NDELAY; */ |
| 626 | } else if (flags & O_FNONBLOCKING) { |
| 627 | ioflag |= IO_NDELAY; |
| 628 | } else if (fp->f_flag & FNONBLOCK) { |
| 629 | ioflag |= IO_NDELAY; |
| 630 | } |
| 631 | if (flags & O_FBUFFERED) { |
| 632 | /* ioflag &= ~IO_DIRECT; */ |
| 633 | } else if (flags & O_FUNBUFFERED) { |
| 634 | ioflag |= IO_DIRECT; |
| 635 | } else if (fp->f_flag & O_DIRECT) { |
| 636 | ioflag |= IO_DIRECT; |
| 637 | } |
| 638 | ioflag |= sequential_heuristic(uio, fp); |
| 639 | |
| 640 | error = dev_dread(dev, uio, ioflag); |
| 641 | |
| 642 | release_dev(dev); |
| 643 | if ((flags & O_FOFFSET) == 0) |
| 644 | fp->f_offset = uio->uio_offset; |
| 645 | fp->f_nextoff = uio->uio_offset; |
| 646 | done: |
| 647 | rel_mplock(); |
| 648 | return (error); |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * MPALMOSTSAFE - acquires mplock |
| 653 | */ |
| 654 | static int |
| 655 | vn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags) |
| 656 | { |
| 657 | struct ccms_lock ccms_lock; |
| 658 | struct vnode *vp; |
| 659 | int error, ioflag; |
| 660 | |
| 661 | get_mplock(); |
| 662 | KASSERT(uio->uio_td == curthread, |
| 663 | ("uio_td %p is not p %p", uio->uio_td, curthread)); |
| 664 | vp = (struct vnode *)fp->f_data; |
| 665 | #if 0 |
| 666 | /* VOP_WRITE should handle this now */ |
| 667 | if (vp->v_type == VREG || vp->v_type == VDATABASE) |
| 668 | bwillwrite(); |
| 669 | #endif |
| 670 | vp = (struct vnode *)fp->f_data; /* XXX needed? */ |
| 671 | |
| 672 | ioflag = IO_UNIT; |
| 673 | if (vp->v_type == VREG && |
| 674 | ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { |
| 675 | ioflag |= IO_APPEND; |
| 676 | } |
| 677 | |
| 678 | if (flags & O_FBLOCKING) { |
| 679 | /* ioflag &= ~IO_NDELAY; */ |
| 680 | } else if (flags & O_FNONBLOCKING) { |
| 681 | ioflag |= IO_NDELAY; |
| 682 | } else if (fp->f_flag & FNONBLOCK) { |
| 683 | ioflag |= IO_NDELAY; |
| 684 | } |
| 685 | if (flags & O_FBUFFERED) { |
| 686 | /* ioflag &= ~IO_DIRECT; */ |
| 687 | } else if (flags & O_FUNBUFFERED) { |
| 688 | ioflag |= IO_DIRECT; |
| 689 | } else if (fp->f_flag & O_DIRECT) { |
| 690 | ioflag |= IO_DIRECT; |
| 691 | } |
| 692 | if (flags & O_FASYNCWRITE) { |
| 693 | /* ioflag &= ~IO_SYNC; */ |
| 694 | } else if (flags & O_FSYNCWRITE) { |
| 695 | ioflag |= IO_SYNC; |
| 696 | } else if (fp->f_flag & O_FSYNC) { |
| 697 | ioflag |= IO_SYNC; |
| 698 | } |
| 699 | |
| 700 | if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) |
| 701 | ioflag |= IO_SYNC; |
| 702 | vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); |
| 703 | if ((flags & O_FOFFSET) == 0) |
| 704 | uio->uio_offset = fp->f_offset; |
| 705 | ioflag |= sequential_heuristic(uio, fp); |
| 706 | ccms_lock_get_uio(&vp->v_ccms, &ccms_lock, uio); |
| 707 | error = VOP_WRITE(vp, uio, ioflag, cred); |
| 708 | ccms_lock_put(&vp->v_ccms, &ccms_lock); |
| 709 | if ((flags & O_FOFFSET) == 0) |
| 710 | fp->f_offset = uio->uio_offset; |
| 711 | fp->f_nextoff = uio->uio_offset; |
| 712 | vn_unlock(vp); |
| 713 | rel_mplock(); |
| 714 | return (error); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * Device-optimized file table vnode write routine. |
| 719 | * |
| 720 | * This bypasses the VOP table and talks directly to the device. Most |
| 721 | * filesystems just route to specfs and can make this optimization. |
| 722 | * |
| 723 | * MPALMOSTSAFE - acquires mplock |
| 724 | */ |
| 725 | static int |
| 726 | svn_write(struct file *fp, struct uio *uio, struct ucred *cred, int flags) |
| 727 | { |
| 728 | struct vnode *vp; |
| 729 | int ioflag; |
| 730 | int error; |
| 731 | cdev_t dev; |
| 732 | |
| 733 | get_mplock(); |
| 734 | KASSERT(uio->uio_td == curthread, |
| 735 | ("uio_td %p is not p %p", uio->uio_td, curthread)); |
| 736 | |
| 737 | vp = (struct vnode *)fp->f_data; |
| 738 | if (vp == NULL || vp->v_type == VBAD) { |
| 739 | error = EBADF; |
| 740 | goto done; |
| 741 | } |
| 742 | if (vp->v_type == VREG) |
| 743 | bwillwrite(uio->uio_resid); |
| 744 | vp = (struct vnode *)fp->f_data; /* XXX needed? */ |
| 745 | |
| 746 | if ((dev = vp->v_rdev) == NULL) { |
| 747 | error = EBADF; |
| 748 | goto done; |
| 749 | } |
| 750 | reference_dev(dev); |
| 751 | |
| 752 | if ((flags & O_FOFFSET) == 0) |
| 753 | uio->uio_offset = fp->f_offset; |
| 754 | |
| 755 | ioflag = IO_UNIT; |
| 756 | if (vp->v_type == VREG && |
| 757 | ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { |
| 758 | ioflag |= IO_APPEND; |
| 759 | } |
| 760 | |
| 761 | if (flags & O_FBLOCKING) { |
| 762 | /* ioflag &= ~IO_NDELAY; */ |
| 763 | } else if (flags & O_FNONBLOCKING) { |
| 764 | ioflag |= IO_NDELAY; |
| 765 | } else if (fp->f_flag & FNONBLOCK) { |
| 766 | ioflag |= IO_NDELAY; |
| 767 | } |
| 768 | if (flags & O_FBUFFERED) { |
| 769 | /* ioflag &= ~IO_DIRECT; */ |
| 770 | } else if (flags & O_FUNBUFFERED) { |
| 771 | ioflag |= IO_DIRECT; |
| 772 | } else if (fp->f_flag & O_DIRECT) { |
| 773 | ioflag |= IO_DIRECT; |
| 774 | } |
| 775 | if (flags & O_FASYNCWRITE) { |
| 776 | /* ioflag &= ~IO_SYNC; */ |
| 777 | } else if (flags & O_FSYNCWRITE) { |
| 778 | ioflag |= IO_SYNC; |
| 779 | } else if (fp->f_flag & O_FSYNC) { |
| 780 | ioflag |= IO_SYNC; |
| 781 | } |
| 782 | |
| 783 | if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) |
| 784 | ioflag |= IO_SYNC; |
| 785 | ioflag |= sequential_heuristic(uio, fp); |
| 786 | |
| 787 | error = dev_dwrite(dev, uio, ioflag); |
| 788 | |
| 789 | release_dev(dev); |
| 790 | if ((flags & O_FOFFSET) == 0) |
| 791 | fp->f_offset = uio->uio_offset; |
| 792 | fp->f_nextoff = uio->uio_offset; |
| 793 | done: |
| 794 | rel_mplock(); |
| 795 | return (error); |
| 796 | } |
| 797 | |
| 798 | /* |
| 799 | * MPALMOSTSAFE - acquires mplock |
| 800 | */ |
| 801 | static int |
| 802 | vn_statfile(struct file *fp, struct stat *sb, struct ucred *cred) |
| 803 | { |
| 804 | struct vnode *vp; |
| 805 | int error; |
| 806 | |
| 807 | get_mplock(); |
| 808 | vp = (struct vnode *)fp->f_data; |
| 809 | error = vn_stat(vp, sb, cred); |
| 810 | rel_mplock(); |
| 811 | return (error); |
| 812 | } |
| 813 | |
| 814 | int |
| 815 | vn_stat(struct vnode *vp, struct stat *sb, struct ucred *cred) |
| 816 | { |
| 817 | struct vattr vattr; |
| 818 | struct vattr *vap; |
| 819 | int error; |
| 820 | u_short mode; |
| 821 | cdev_t dev; |
| 822 | |
| 823 | vap = &vattr; |
| 824 | error = VOP_GETATTR(vp, vap); |
| 825 | if (error) |
| 826 | return (error); |
| 827 | |
| 828 | /* |
| 829 | * Zero the spare stat fields |
| 830 | */ |
| 831 | sb->st_lspare = 0; |
| 832 | sb->st_qspare = 0; |
| 833 | |
| 834 | /* |
| 835 | * Copy from vattr table |
| 836 | */ |
| 837 | if (vap->va_fsid != VNOVAL) |
| 838 | sb->st_dev = vap->va_fsid; |
| 839 | else |
| 840 | sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; |
| 841 | sb->st_ino = vap->va_fileid; |
| 842 | mode = vap->va_mode; |
| 843 | switch (vap->va_type) { |
| 844 | case VREG: |
| 845 | mode |= S_IFREG; |
| 846 | break; |
| 847 | case VDATABASE: |
| 848 | mode |= S_IFDB; |
| 849 | break; |
| 850 | case VDIR: |
| 851 | mode |= S_IFDIR; |
| 852 | break; |
| 853 | case VBLK: |
| 854 | mode |= S_IFBLK; |
| 855 | break; |
| 856 | case VCHR: |
| 857 | mode |= S_IFCHR; |
| 858 | break; |
| 859 | case VLNK: |
| 860 | mode |= S_IFLNK; |
| 861 | /* This is a cosmetic change, symlinks do not have a mode. */ |
| 862 | if (vp->v_mount->mnt_flag & MNT_NOSYMFOLLOW) |
| 863 | sb->st_mode &= ~ACCESSPERMS; /* 0000 */ |
| 864 | else |
| 865 | sb->st_mode |= ACCESSPERMS; /* 0777 */ |
| 866 | break; |
| 867 | case VSOCK: |
| 868 | mode |= S_IFSOCK; |
| 869 | break; |
| 870 | case VFIFO: |
| 871 | mode |= S_IFIFO; |
| 872 | break; |
| 873 | default: |
| 874 | return (EBADF); |
| 875 | } |
| 876 | sb->st_mode = mode; |
| 877 | if (vap->va_nlink > (nlink_t)-1) |
| 878 | sb->st_nlink = (nlink_t)-1; |
| 879 | else |
| 880 | sb->st_nlink = vap->va_nlink; |
| 881 | sb->st_uid = vap->va_uid; |
| 882 | sb->st_gid = vap->va_gid; |
| 883 | sb->st_rdev = makeudev(vap->va_rmajor, vap->va_rminor); |
| 884 | sb->st_size = vap->va_size; |
| 885 | sb->st_atimespec = vap->va_atime; |
| 886 | sb->st_mtimespec = vap->va_mtime; |
| 887 | sb->st_ctimespec = vap->va_ctime; |
| 888 | |
| 889 | /* |
| 890 | * A VCHR and VBLK device may track the last access and last modified |
| 891 | * time independantly of the filesystem. This is particularly true |
| 892 | * because device read and write calls may bypass the filesystem. |
| 893 | */ |
| 894 | if (vp->v_type == VCHR || vp->v_type == VBLK) { |
| 895 | dev = vp->v_rdev; |
| 896 | if (dev != NULL) { |
| 897 | if (dev->si_lastread) { |
| 898 | sb->st_atimespec.tv_sec = dev->si_lastread; |
| 899 | sb->st_atimespec.tv_nsec = 0; |
| 900 | } |
| 901 | if (dev->si_lastwrite) { |
| 902 | sb->st_atimespec.tv_sec = dev->si_lastwrite; |
| 903 | sb->st_atimespec.tv_nsec = 0; |
| 904 | } |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * According to www.opengroup.org, the meaning of st_blksize is |
| 910 | * "a filesystem-specific preferred I/O block size for this |
| 911 | * object. In some filesystem types, this may vary from file |
| 912 | * to file" |
| 913 | * Default to PAGE_SIZE after much discussion. |
| 914 | */ |
| 915 | |
| 916 | if (vap->va_type == VREG) { |
| 917 | sb->st_blksize = vap->va_blocksize; |
| 918 | } else if (vn_isdisk(vp, NULL)) { |
| 919 | /* |
| 920 | * XXX this is broken. If the device is not yet open (aka |
| 921 | * stat() call, aka v_rdev == NULL), how are we supposed |
| 922 | * to get a valid block size out of it? |
| 923 | */ |
| 924 | dev = vp->v_rdev; |
| 925 | if (dev == NULL && vp->v_type == VCHR) { |
| 926 | dev = get_dev(vp->v_umajor, vp->v_uminor); |
| 927 | } |
| 928 | sb->st_blksize = dev->si_bsize_best; |
| 929 | if (sb->st_blksize < dev->si_bsize_phys) |
| 930 | sb->st_blksize = dev->si_bsize_phys; |
| 931 | if (sb->st_blksize < BLKDEV_IOSIZE) |
| 932 | sb->st_blksize = BLKDEV_IOSIZE; |
| 933 | } else { |
| 934 | sb->st_blksize = PAGE_SIZE; |
| 935 | } |
| 936 | |
| 937 | sb->st_flags = vap->va_flags; |
| 938 | |
| 939 | error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); |
| 940 | if (error) |
| 941 | sb->st_gen = 0; |
| 942 | else |
| 943 | sb->st_gen = (u_int32_t)vap->va_gen; |
| 944 | |
| 945 | sb->st_blocks = vap->va_bytes / S_BLKSIZE; |
| 946 | sb->st_fsmid = vap->va_fsmid; |
| 947 | return (0); |
| 948 | } |
| 949 | |
| 950 | /* |
| 951 | * MPALMOSTSAFE - acquires mplock |
| 952 | */ |
| 953 | static int |
| 954 | vn_ioctl(struct file *fp, u_long com, caddr_t data, struct ucred *ucred) |
| 955 | { |
| 956 | struct vnode *vp = ((struct vnode *)fp->f_data); |
| 957 | struct vnode *ovp; |
| 958 | struct vattr vattr; |
| 959 | int error; |
| 960 | |
| 961 | get_mplock(); |
| 962 | |
| 963 | switch (vp->v_type) { |
| 964 | case VREG: |
| 965 | case VDIR: |
| 966 | if (com == FIONREAD) { |
| 967 | error = VOP_GETATTR(vp, &vattr); |
| 968 | if (error) |
| 969 | break; |
| 970 | *(int *)data = vattr.va_size - fp->f_offset; |
| 971 | error = 0; |
| 972 | break; |
| 973 | } |
| 974 | if (com == FIOASYNC) { /* XXX */ |
| 975 | error = 0; /* XXX */ |
| 976 | break; |
| 977 | } |
| 978 | /* fall into ... */ |
| 979 | default: |
| 980 | #if 0 |
| 981 | return (ENOTTY); |
| 982 | #endif |
| 983 | case VFIFO: |
| 984 | case VCHR: |
| 985 | case VBLK: |
| 986 | if (com == FIODTYPE) { |
| 987 | if (vp->v_type != VCHR && vp->v_type != VBLK) { |
| 988 | error = ENOTTY; |
| 989 | break; |
| 990 | } |
| 991 | *(int *)data = dev_dflags(vp->v_rdev) & D_TYPEMASK; |
| 992 | error = 0; |
| 993 | break; |
| 994 | } |
| 995 | error = VOP_IOCTL(vp, com, data, fp->f_flag, ucred); |
| 996 | if (error == 0 && com == TIOCSCTTY) { |
| 997 | struct proc *p = curthread->td_proc; |
| 998 | struct session *sess; |
| 999 | |
| 1000 | if (p == NULL) { |
| 1001 | error = ENOTTY; |
| 1002 | break; |
| 1003 | } |
| 1004 | |
| 1005 | sess = p->p_session; |
| 1006 | /* Do nothing if reassigning same control tty */ |
| 1007 | if (sess->s_ttyvp == vp) { |
| 1008 | error = 0; |
| 1009 | break; |
| 1010 | } |
| 1011 | |
| 1012 | /* Get rid of reference to old control tty */ |
| 1013 | ovp = sess->s_ttyvp; |
| 1014 | vref(vp); |
| 1015 | sess->s_ttyvp = vp; |
| 1016 | if (ovp) |
| 1017 | vrele(ovp); |
| 1018 | } |
| 1019 | break; |
| 1020 | } |
| 1021 | rel_mplock(); |
| 1022 | return (error); |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * MPALMOSTSAFE - acquires mplock |
| 1027 | */ |
| 1028 | static int |
| 1029 | vn_poll(struct file *fp, int events, struct ucred *cred) |
| 1030 | { |
| 1031 | int error; |
| 1032 | |
| 1033 | get_mplock(); |
| 1034 | error = VOP_POLL(((struct vnode *)fp->f_data), events, cred); |
| 1035 | rel_mplock(); |
| 1036 | return (error); |
| 1037 | } |
| 1038 | |
| 1039 | /* |
| 1040 | * Check that the vnode is still valid, and if so |
| 1041 | * acquire requested lock. |
| 1042 | */ |
| 1043 | int |
| 1044 | #ifndef DEBUG_LOCKS |
| 1045 | vn_lock(struct vnode *vp, int flags) |
| 1046 | #else |
| 1047 | debug_vn_lock(struct vnode *vp, int flags, const char *filename, int line) |
| 1048 | #endif |
| 1049 | { |
| 1050 | int error; |
| 1051 | |
| 1052 | do { |
| 1053 | #ifdef DEBUG_LOCKS |
| 1054 | vp->filename = filename; |
| 1055 | vp->line = line; |
| 1056 | error = debuglockmgr(&vp->v_lock, flags, |
| 1057 | "vn_lock", filename, line); |
| 1058 | #else |
| 1059 | error = lockmgr(&vp->v_lock, flags); |
| 1060 | #endif |
| 1061 | if (error == 0) |
| 1062 | break; |
| 1063 | } while (flags & LK_RETRY); |
| 1064 | |
| 1065 | /* |
| 1066 | * Because we (had better!) have a ref on the vnode, once it |
| 1067 | * goes to VRECLAIMED state it will not be recycled until all |
| 1068 | * refs go away. So we can just check the flag. |
| 1069 | */ |
| 1070 | if (error == 0 && (vp->v_flag & VRECLAIMED)) { |
| 1071 | lockmgr(&vp->v_lock, LK_RELEASE); |
| 1072 | error = ENOENT; |
| 1073 | } |
| 1074 | return (error); |
| 1075 | } |
| 1076 | |
| 1077 | void |
| 1078 | vn_unlock(struct vnode *vp) |
| 1079 | { |
| 1080 | lockmgr(&vp->v_lock, LK_RELEASE); |
| 1081 | } |
| 1082 | |
| 1083 | int |
| 1084 | vn_islocked(struct vnode *vp) |
| 1085 | { |
| 1086 | return (lockstatus(&vp->v_lock, curthread)); |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * MPALMOSTSAFE - acquires mplock |
| 1091 | */ |
| 1092 | static int |
| 1093 | vn_closefile(struct file *fp) |
| 1094 | { |
| 1095 | int error; |
| 1096 | |
| 1097 | get_mplock(); |
| 1098 | fp->f_ops = &badfileops; |
| 1099 | error = vn_close(((struct vnode *)fp->f_data), fp->f_flag); |
| 1100 | rel_mplock(); |
| 1101 | return (error); |
| 1102 | } |
| 1103 | |
| 1104 | /* |
| 1105 | * MPALMOSTSAFE - acquires mplock |
| 1106 | */ |
| 1107 | static int |
| 1108 | vn_kqfilter(struct file *fp, struct knote *kn) |
| 1109 | { |
| 1110 | int error; |
| 1111 | |
| 1112 | get_mplock(); |
| 1113 | error = VOP_KQFILTER(((struct vnode *)fp->f_data), kn); |
| 1114 | rel_mplock(); |
| 1115 | return (error); |
| 1116 | } |