xref: /netbsd-src/sys/fs/efs/efs_vnops.c (revision 6a493d6bc668897c91594964a732d38505b70cbb)
1 /*	$NetBSD: efs_vnops.c,v 1.30 2013/03/18 19:35:36 plunky Exp $	*/
2 
3 /*
4  * Copyright (c) 2006 Stephen M. Rumble <rumble@ephemeral.org>
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #include <sys/cdefs.h>
20 __KERNEL_RCSID(0, "$NetBSD: efs_vnops.c,v 1.30 2013/03/18 19:35:36 plunky Exp $");
21 
22 #include <sys/param.h>
23 #include <sys/systm.h>
24 #include <sys/proc.h>
25 #include <sys/kernel.h>
26 #include <sys/vnode.h>
27 #include <sys/mount.h>
28 #include <sys/malloc.h>
29 #include <sys/namei.h>
30 #include <sys/dirent.h>
31 #include <sys/lockf.h>
32 #include <sys/unistd.h>
33 #include <sys/buf.h>
34 
35 #include <miscfs/genfs/genfs.h>
36 #include <miscfs/genfs/genfs_node.h>
37 #include <miscfs/fifofs/fifo.h>
38 #include <miscfs/specfs/specdev.h>
39 
40 #include <fs/efs/efs.h>
41 #include <fs/efs/efs_sb.h>
42 #include <fs/efs/efs_dir.h>
43 #include <fs/efs/efs_genfs.h>
44 #include <fs/efs/efs_mount.h>
45 #include <fs/efs/efs_extent.h>
46 #include <fs/efs/efs_dinode.h>
47 #include <fs/efs/efs_inode.h>
48 #include <fs/efs/efs_subr.h>
49 #include <fs/efs/efs_ihash.h>
50 
51 MALLOC_DECLARE(M_EFSTMP);
52 
53 /*
54  * Lookup a pathname component in the given directory.
55  *
56  * Returns 0 on success.
57  */
58 static int
59 efs_lookup(void *v)
60 {
61 	struct vop_lookup_args /* {
62 		struct vnode *a_dvp;
63 		struct vnode **a_vpp;
64 		struct componentname *a_cnp;
65 	} */ *ap = v;
66 	struct componentname *cnp = ap->a_cnp;
67 	struct vnode *vp;
68 	ino_t ino;
69 	int err, nameiop = cnp->cn_nameiop;
70 
71 	/* ensure that the directory can be accessed first */
72         err = VOP_ACCESS(ap->a_dvp, VEXEC, cnp->cn_cred);
73 	if (err)
74 		return (err);
75 
76 	if (cache_lookup(ap->a_dvp, cnp->cn_nameptr, cnp->cn_namelen,
77 			 cnp->cn_nameiop, cnp->cn_flags, NULL, ap->a_vpp)) {
78 		return *ap->a_vpp == NULLVP ? ENOENT : 0;
79 	}
80 
81 	/*
82 	 * Handle the three lookup types: '.', '..', and everything else.
83 	 */
84 	if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') {
85 		vref(ap->a_dvp);
86 		*ap->a_vpp = ap->a_dvp;
87 	} else if (cnp->cn_flags & ISDOTDOT) {
88 		err = efs_inode_lookup(VFSTOEFS(ap->a_dvp->v_mount),
89 		    EFS_VTOI(ap->a_dvp), ap->a_cnp, &ino);
90 		if (err)
91 			return (err);
92 
93 		VOP_UNLOCK(ap->a_dvp);	/* preserve lock order */
94 
95 		err = VFS_VGET(ap->a_dvp->v_mount, ino, &vp);
96 		if (err) {
97 			vn_lock(ap->a_dvp, LK_EXCLUSIVE | LK_RETRY);
98 			return (err);
99 		}
100 		vn_lock(ap->a_dvp, LK_EXCLUSIVE | LK_RETRY);
101 		*ap->a_vpp = vp;
102 	} else {
103 		err = efs_inode_lookup(VFSTOEFS(ap->a_dvp->v_mount),
104 		    EFS_VTOI(ap->a_dvp), ap->a_cnp, &ino);
105 		if (err) {
106 			if (err == ENOENT && nameiop != CREATE)
107 				cache_enter(ap->a_dvp, NULL, cnp->cn_nameptr,
108 					    cnp->cn_namelen, cnp->cn_flags);
109 			if (err == ENOENT && (nameiop == CREATE ||
110 			    nameiop == RENAME)) {
111 				err = VOP_ACCESS(ap->a_dvp, VWRITE,
112 				    cnp->cn_cred);
113 				if (err)
114 					return (err);
115 				return (EJUSTRETURN);
116 			}
117 			return (err);
118 		}
119 		err = VFS_VGET(ap->a_dvp->v_mount, ino, &vp);
120 		if (err)
121 			return (err);
122 		*ap->a_vpp = vp;
123 	}
124 
125 	cache_enter(ap->a_dvp, *ap->a_vpp, cnp->cn_nameptr, cnp->cn_namelen,
126 		    cnp->cn_flags);
127 
128 	return 0;
129 }
130 
131 static int
132 efs_check_possible(struct vnode *vp, struct efs_inode *eip, mode_t mode)
133 {
134 
135 	if ((mode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY))
136 		return (EROFS);
137 
138 	return 0;
139 }
140 
141 /*
142  * Determine the accessiblity of a file based on the permissions allowed by the
143  * specified credentials.
144  *
145  * Returns 0 on success.
146  */
147 static int
148 efs_check_permitted(struct vnode *vp, struct efs_inode *eip, mode_t mode,
149     kauth_cred_t cred)
150 {
151 
152 	return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode,
153 	    vp->v_type, eip->ei_mode), vp, NULL, genfs_can_access(vp->v_type,
154 	    eip->ei_mode, eip->ei_uid, eip->ei_gid, mode, cred));
155 }
156 
157 static int
158 efs_access(void *v)
159 {
160 	struct vop_access_args /* {
161 		const struct vnodeop_desc *a_desc;
162 		struct vnode *a_vp;
163 		int a_mode;
164 		struct ucred *a_cred;
165 	} */ *ap = v;
166 	struct vnode *vp = ap->a_vp;
167 	struct efs_inode *eip = EFS_VTOI(vp);
168 	int error;
169 
170 	error = efs_check_possible(vp, eip, ap->a_mode);
171 	if (error)
172 		return error;
173 
174 	error = efs_check_permitted(vp, eip, ap->a_mode, ap->a_cred);
175 
176 	return error;
177 }
178 
179 /*
180  * Get specific vnode attributes on a file. See vattr(9).
181  *
182  * Returns 0 on success.
183  */
184 static int
185 efs_getattr(void *v)
186 {
187 	struct vop_getattr_args /* {
188 		const struct vnodeop_desc *a_desc;
189 		struct vnode *a_vp;
190 		struct vattr *a_vap;
191 		struct ucred *a_cred;
192 	} */ *ap = v;
193 
194 	struct vattr *vap = ap->a_vap;
195 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
196 
197 	vattr_null(ap->a_vap);
198 	vap->va_type		= ap->a_vp->v_type;
199 	vap->va_mode		= eip->ei_mode;
200 	vap->va_nlink		= eip->ei_nlink;
201 	vap->va_uid		= eip->ei_uid;
202 	vap->va_gid		= eip->ei_gid;
203 	vap->va_fsid 		= ap->a_vp->v_mount->mnt_stat.f_fsid;
204 	vap->va_fileid 		= eip->ei_number;
205 	vap->va_size 		= eip->ei_size;
206 
207 	if (ap->a_vp->v_type == VBLK)
208 		vap->va_blocksize = BLKDEV_IOSIZE;
209 	else if (ap->a_vp->v_type == VCHR)
210 		vap->va_blocksize = MAXBSIZE;
211 	else
212 		vap->va_blocksize = EFS_BB_SIZE;
213 
214 	vap->va_atime.tv_sec	= eip->ei_atime;
215 	vap->va_mtime.tv_sec	= eip->ei_mtime;
216 	vap->va_ctime.tv_sec	= eip->ei_ctime;
217 /*	vap->va_birthtime 	= */
218 	vap->va_gen		= eip->ei_gen;
219 	vap->va_flags		= ap->a_vp->v_vflag |
220 	    ap->a_vp->v_iflag | ap->a_vp->v_uflag;
221 
222 	if (ap->a_vp->v_type == VBLK || ap->a_vp->v_type == VCHR) {
223 		uint32_t dmaj, dmin;
224 
225 		if (be16toh(eip->ei_di.di_odev) != EFS_DINODE_ODEV_INVALID) {
226 			dmaj = EFS_DINODE_ODEV_MAJ(be16toh(eip->ei_di.di_odev));
227 			dmin = EFS_DINODE_ODEV_MIN(be16toh(eip->ei_di.di_odev));
228 		} else {
229 			dmaj = EFS_DINODE_NDEV_MAJ(be32toh(eip->ei_di.di_ndev));
230 			dmin = EFS_DINODE_NDEV_MIN(be32toh(eip->ei_di.di_ndev));
231 		}
232 
233 		vap->va_rdev = makedev(dmaj, dmin);
234 	}
235 
236 	vap->va_bytes		= eip->ei_size;
237 /*	vap->va_filerev		= */
238 /*	vap->va_vaflags		= */
239 
240 	return (0);
241 }
242 
243 /*
244  * Read a file.
245  *
246  * Returns 0 on success.
247  */
248 static int
249 efs_read(void *v)
250 {
251 	struct vop_read_args /* {
252 		const struct vnodeop_desc *a_desc;
253 		struct vnode *a_vp;
254 		struct uio *a_uio;
255 		int a_ioflag;
256 		struct ucred *a_cred;
257 	} */ *ap = v;
258 	struct efs_extent ex;
259 	struct efs_extent_iterator exi;
260 	struct uio *uio = ap->a_uio;
261 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
262 	off_t start;
263 	vsize_t len;
264 	int err, ret;
265 	const int advice = IO_ADV_DECODE(ap->a_ioflag);
266 
267 	if (ap->a_vp->v_type == VDIR)
268 		return (EISDIR);
269 
270 	if (ap->a_vp->v_type != VREG)
271 		return (EINVAL);
272 
273 	efs_extent_iterator_init(&exi, eip, uio->uio_offset);
274 	ret = efs_extent_iterator_next(&exi, &ex);
275 	while (ret == 0) {
276 		if (uio->uio_offset < 0 || uio->uio_offset >= eip->ei_size ||
277 		    uio->uio_resid == 0)
278 			break;
279 
280 		start = ex.ex_offset * EFS_BB_SIZE;
281 		len   = ex.ex_length * EFS_BB_SIZE;
282 
283 		if (!(uio->uio_offset >= start &&
284 		      uio->uio_offset < (start + len))) {
285 			ret = efs_extent_iterator_next(&exi, &ex);
286 			continue;
287 		}
288 
289 		start = uio->uio_offset - start;
290 
291 		len = MIN(len - start, uio->uio_resid);
292 		len = MIN(len, eip->ei_size - uio->uio_offset);
293 
294 		err = ubc_uiomove(&ap->a_vp->v_uobj, uio, len, advice,
295 		    UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(ap->a_vp));
296 		if (err) {
297 			EFS_DPRINTF(("efs_read: uiomove error %d\n",
298 			    err));
299 			return (err);
300 		}
301 	}
302 
303 	return ((ret == -1) ? 0 : ret);
304 }
305 
306 static int
307 efs_readdir(void *v)
308 {
309 	struct vop_readdir_args /* {
310 		const struct vnodeop_desc *a_desc;
311 		struct vnode *a_vp;
312 		struct uio *a_uio;
313 		struct ucred *a_cred;
314 		int *a_eofflag;
315 		off_t **a_cookies;
316 		int *a_ncookies;
317 	} */ *ap = v;
318 	struct dirent *dp;
319 	struct efs_dinode edi;
320 	struct efs_extent ex;
321 	struct efs_extent_iterator exi;
322 	struct buf *bp;
323 	struct efs_dirent *de;
324 	struct efs_dirblk *db;
325 	struct uio *uio = ap->a_uio;
326 	struct efs_inode *ei = EFS_VTOI(ap->a_vp);
327 	off_t *cookies = NULL;
328 	off_t offset;
329 	int i, j, err, ret, s, slot, ncookies, maxcookies = 0;
330 
331 	if (ap->a_vp->v_type != VDIR)
332 		return (ENOTDIR);
333 
334 	if (ap->a_eofflag != NULL)
335 		*ap->a_eofflag = false;
336 
337 	if (ap->a_ncookies != NULL) {
338 		ncookies = 0;
339 		maxcookies =
340 		    uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0);
341 		cookies = malloc(maxcookies * sizeof(off_t), M_TEMP, M_WAITOK);
342  	}
343 
344 	dp = malloc(sizeof(struct dirent), M_EFSTMP, M_WAITOK | M_ZERO);
345 
346 	offset = 0;
347 	efs_extent_iterator_init(&exi, ei, 0);
348 	while ((ret = efs_extent_iterator_next(&exi, &ex)) == 0) {
349 		for (i = 0; i < ex.ex_length; i++) {
350 			err = efs_bread(VFSTOEFS(ap->a_vp->v_mount),
351 			    ex.ex_bn + i, NULL, &bp);
352 			if (err) {
353 				goto exit_err;
354 			}
355 
356 			db = (struct efs_dirblk *)bp->b_data;
357 
358 			if (be16toh(db->db_magic) != EFS_DIRBLK_MAGIC) {
359 				printf("efs_readdir: bad dirblk\n");
360 				brelse(bp, 0);
361 				continue;
362 			}
363 
364 			for (j = 0; j < db->db_slots; j++) {
365 				slot = EFS_DIRENT_OFF_EXPND(db->db_space[j]);
366 				if (slot == EFS_DIRBLK_SLOT_FREE)
367 					continue;
368 
369 				if (!EFS_DIRENT_OFF_VALID(slot)) {
370 					printf("efs_readdir: bad dirent\n");
371 					continue;
372 				}
373 
374 				de = EFS_DIRBLK_TO_DIRENT(db, slot);
375 				s = _DIRENT_RECLEN(dp, de->de_namelen);
376 
377 				if (offset < uio->uio_offset) {
378 					offset += s;
379 					continue;
380 				}
381 
382 				/* XXX - shouldn't happen, right? */
383 				if (offset > uio->uio_offset ||
384 				    s > uio->uio_resid) {
385 					brelse(bp, 0);
386 					goto exit_ok;
387 				}
388 
389 				/* de_namelen is uint8_t, d.d_name is 512b */
390 				KASSERT(sizeof(dp->d_name)-de->de_namelen > 0);
391 				dp->d_fileno = be32toh(de->de_inumber);
392 				dp->d_reclen = s;
393 				dp->d_namlen = de->de_namelen;
394 				memcpy(dp->d_name, de->de_name,
395 				    de->de_namelen);
396 				dp->d_name[de->de_namelen] = '\0';
397 
398 				/* look up inode to get type */
399 				err = efs_read_inode(
400 				    VFSTOEFS(ap->a_vp->v_mount),
401 				    dp->d_fileno, NULL, &edi);
402 				if (err) {
403 					brelse(bp, 0);
404 					goto exit_err;
405 				}
406 
407 				switch (be16toh(edi.di_mode) & EFS_IFMT) {
408 				case EFS_IFIFO:
409 					dp->d_type = DT_FIFO;
410 					break;
411 				case EFS_IFCHR:
412 					dp->d_type = DT_CHR;
413 					break;
414 				case EFS_IFDIR:
415 					dp->d_type = DT_DIR;
416 					break;
417 				case EFS_IFBLK:
418 					dp->d_type = DT_BLK;
419 					break;
420 				case EFS_IFREG:
421 					dp->d_type = DT_REG;
422 					break;
423 				case EFS_IFLNK:
424 					dp->d_type = DT_LNK;
425 					break;
426 				case EFS_IFSOCK:
427 					dp->d_type = DT_SOCK;
428 					break;
429 				default:
430 					dp->d_type = DT_UNKNOWN;
431 					break;
432 				}
433 
434 				err = uiomove(dp, s, uio);
435 				if (err) {
436 					brelse(bp, 0);
437 					goto exit_err;
438 				}
439 
440 				offset += s;
441 
442 				if (cookies != NULL && maxcookies != 0) {
443 					cookies[ncookies++] = offset;
444 					if (ncookies == maxcookies) {
445 						brelse(bp, 0);
446 						goto exit_ok;
447 					}
448 				}
449 			}
450 
451 			brelse(bp, 0);
452 		}
453 	}
454 
455 	if (ret != -1) {
456 		err = ret;
457 		goto exit_err;
458 	}
459 
460 	if (ap->a_eofflag != NULL)
461 		*ap->a_eofflag = true;
462 
463  exit_ok:
464 	if (cookies != NULL) {
465 		*ap->a_cookies = cookies;
466 		*ap->a_ncookies = ncookies;
467 	}
468 
469 	uio->uio_offset = offset;
470 
471 	free(dp, M_EFSTMP);
472 
473 	return (0);
474 
475  exit_err:
476 	if (cookies != NULL)
477 		free(cookies, M_TEMP);
478 
479 	free(dp, M_EFSTMP);
480 
481 	return (err);
482 }
483 
484 static int
485 efs_readlink(void *v)
486 {
487 	struct vop_readlink_args /* {
488 		const struct vnodeop_desc *a_desc;
489 		struct vnode *a_vp;
490 		struct uio *a_uio;
491 		struct ucred *a_cred;
492 	} */ *ap = v;
493 	struct uio *uio = ap->a_uio;
494 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
495 	char *buf;
496 	size_t len;
497 	int err, i;
498 
499 	if ((eip->ei_mode & EFS_IFMT) != EFS_IFLNK)
500 		return (EINVAL);
501 
502 	if (uio->uio_resid < 1)
503 		return (EINVAL);
504 
505 	buf = malloc(eip->ei_size + 1, M_EFSTMP, M_ZERO | M_WAITOK);
506 
507 	/* symlinks are either inlined in the inode, or in extents */
508 	if (eip->ei_numextents == 0) {
509 		if (eip->ei_size > sizeof(eip->ei_di.di_symlink)) {
510 			EFS_DPRINTF(("efs_readlink: too big for inline\n"));
511 			free(buf, M_EFSTMP);
512 			return (EBADF);
513 		}
514 
515 		memcpy(buf, eip->ei_di.di_symlink, eip->ei_size);
516 		len = MIN(uio->uio_resid, eip->ei_size + 1);
517 	} else {
518 		struct efs_extent_iterator exi;
519 		struct efs_extent ex;
520 		struct buf *bp;
521 		int resid, off, ret;
522 
523 		off = 0;
524 		resid = eip->ei_size;
525 
526 		efs_extent_iterator_init(&exi, eip, 0);
527 		while ((ret = efs_extent_iterator_next(&exi, &ex)) == 0) {
528 			for (i = 0; i < ex.ex_length; i++) {
529 				err = efs_bread(VFSTOEFS(ap->a_vp->v_mount),
530 				    ex.ex_bn + i, NULL, &bp);
531 				if (err) {
532 					free(buf, M_EFSTMP);
533 					return (err);
534 				}
535 
536 				len = MIN(resid, bp->b_bcount);
537 				memcpy(buf + off, bp->b_data, len);
538 				brelse(bp, 0);
539 
540 				off += len;
541 				resid -= len;
542 
543 				if (resid == 0)
544 					break;
545 			}
546 
547 			if (resid == 0)
548 				break;
549 		}
550 
551 		if (ret != 0 && ret != -1) {
552 			free(buf, M_EFSTMP);
553 			return (ret);
554 		}
555 
556 		len = off + 1;
557 	}
558 
559 	KASSERT(len >= 1 && len <= (eip->ei_size + 1));
560 	buf[len - 1] = '\0';
561 	err = uiomove(buf, len, uio);
562 	free(buf, M_EFSTMP);
563 
564 	return (err);
565 }
566 
567 /*
568  * Release an inactive vnode. The vnode _must_ be unlocked on return.
569  * It is either nolonger being used by the kernel, or an unmount is being
570  * forced.
571  *
572  * Returns 0 on success.
573  */
574 static int
575 efs_inactive(void *v)
576 {
577 	struct vop_inactive_args /* {
578 		const struct vnodeop_desc *a_desc;
579 		struct vnode *a_vp;
580 		bool *a_recycle
581 	} */ *ap = v;
582 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
583 
584 	*ap->a_recycle = (eip->ei_mode == 0);
585 	VOP_UNLOCK(ap->a_vp);
586 
587 	return (0);
588 }
589 
590 static int
591 efs_reclaim(void *v)
592 {
593 	struct vop_reclaim_args /* {
594 		const struct vnodeop_desc *a_desc;
595 		struct vnode *a_vp;
596 	} */ *ap = v;
597 	struct vnode *vp = ap->a_vp;
598 
599 	efs_ihashrem(EFS_VTOI(vp));
600 	genfs_node_destroy(vp);
601 	pool_put(&efs_inode_pool, vp->v_data);
602 	vp->v_data = NULL;
603 
604 	return (0);
605 }
606 
607 static int
608 efs_bmap(void *v)
609 {
610 	struct vop_bmap_args /* {
611 		const struct vnodeop_desc *a_desc;
612 		struct vnode *a_vp;
613 		daddr_t a_bn;
614 		struct vnode **a_vpp;
615 		daddr_t *a_bnp;
616 		int *a_runp;
617 	} */ *ap = v;
618 	struct efs_extent ex;
619 	struct efs_extent_iterator exi;
620 	struct vnode *vp = ap->a_vp;
621 	struct efs_inode *eip = EFS_VTOI(vp);
622 	bool found;
623 	int ret;
624 
625 	if (ap->a_vpp != NULL)
626 		*ap->a_vpp = VFSTOEFS(vp->v_mount)->em_devvp;
627 
628 	found = false;
629 	efs_extent_iterator_init(&exi, eip, ap->a_bn * EFS_BB_SIZE);
630 	while ((ret = efs_extent_iterator_next(&exi, &ex)) == 0) {
631 		if (ap->a_bn >= ex.ex_offset &&
632 		    ap->a_bn < (ex.ex_offset + ex.ex_length)) {
633 			found = true;
634 			break;
635 		}
636 	}
637 
638 	KASSERT(!found || (found && ret == 0));
639 
640 	if (!found) {
641 		EFS_DPRINTF(("efs_bmap: ap->a_bn not in extents\n"));
642 		return ((ret == -1) ? EIO : ret);
643 	}
644 
645 	if (ex.ex_magic != EFS_EXTENT_MAGIC) {
646 		EFS_DPRINTF(("efs_bmap: exn.ex_magic != EFS_EXTENT_MAGIC\n"));
647 		return (EIO);
648 	}
649 
650 	if (ap->a_bn < ex.ex_offset) {
651 		EFS_DPRINTF(("efs_bmap: ap->a_bn < exn.ex_offset\n"));
652 		return (EIO);
653 	}
654 
655 	KASSERT(ap->a_bn >= ex.ex_offset);
656 	KASSERT(ex.ex_length > ap->a_bn - ex.ex_offset);
657 
658 	*ap->a_bnp = ex.ex_bn + (ap->a_bn - ex.ex_offset);
659 	if (ap->a_runp != NULL)
660 		*ap->a_runp = ex.ex_length - (ap->a_bn - ex.ex_offset) - 1;
661 
662 	return (0);
663 }
664 
665 static int
666 efs_strategy(void *v)
667 {
668 	struct vop_strategy_args /* {
669 		const struct vnodeop_desc *a_desc;
670 		struct vnode *a_vp;
671 		struct buf *a_bp;
672 	} */ *ap = v;
673 	struct vnode *vp = ap->a_vp;
674 	struct buf *bp = ap->a_bp;
675 	int error;
676 
677 	if (vp == NULL) {
678 		bp->b_error = EIO;
679 		biodone(bp);
680 		return (EIO);
681 	}
682 
683 	if (bp->b_blkno == bp->b_lblkno) {
684 		error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
685 		if (error) {
686 			bp->b_error = error;
687 			biodone(bp);
688 			return (error);
689 		}
690 		if ((long)bp->b_blkno == -1)
691 			clrbuf(bp);
692 	}
693 
694 	if ((long)bp->b_blkno == -1) {
695 		biodone(bp);
696 		return (0);
697 	}
698 
699 	return (VOP_STRATEGY(VFSTOEFS(vp->v_mount)->em_devvp, bp));
700 }
701 
702 static int
703 efs_print(void *v)
704 {
705 	struct vop_print_args /* {
706 		const struct vnodeop_desc *a_desc;
707 		struct vnode *a_vp;
708 	} */ *ap = v;
709 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
710 
711 	printf(	"efs_inode (ino %lu):\n"
712 		"    ei_mode:         %07o\n"
713 		"    ei_nlink:        %d\n"
714 		"    ei_uid:          %d\n"
715 		"    ei_gid:          %d\n"
716 		"    ei_size:         %d\n"
717 		"    ei_atime:        %d\n"
718 		"    ei_mtime:        %d\n"
719 		"    ei_ctime:        %d\n"
720 		"    ei_gen:          %d\n"
721 		"    ei_numextents:   %d\n"
722 		"    ei_version:      %d\n",
723 		(unsigned long)eip->ei_number,
724 		(unsigned int)eip->ei_mode,
725 		eip->ei_nlink,
726 		eip->ei_uid,
727 		eip->ei_gid,
728 		eip->ei_size,
729 		(int32_t)eip->ei_atime,
730 		(int32_t)eip->ei_mtime,
731 		(int32_t)eip->ei_ctime,
732 		eip->ei_gen,
733 		eip->ei_numextents,
734 		eip->ei_version);
735 
736 	return (0);
737 }
738 
739 static int
740 efs_pathconf(void *v)
741 {
742 	struct vop_pathconf_args /* {
743 		const struct vnodeop_desc *a_desc;
744 		struct vnode *a_vp;
745 		int a_name;
746 		register_t *a_retval;
747 	} */ *ap = v;
748 
749 	/* IRIX 4 values */
750 	switch (ap->a_name) {
751 	case _PC_LINK_MAX:
752 		*ap->a_retval = 30000;
753 		break;
754 	case _PC_NAME_MAX:
755 		*ap->a_retval = 255;
756 		break;
757 	case _PC_PATH_MAX:
758 		*ap->a_retval = 1024;
759 		break;
760 	case _PC_NO_TRUNC:
761 		*ap->a_retval = 1;
762 		break;
763 	case _PC_CHOWN_RESTRICTED:
764 		*ap->a_retval = 1;
765 		break;
766 	case _PC_SYNC_IO:
767 		*ap->a_retval = 1;
768 		break;
769 	case _PC_FILESIZEBITS:
770 		*ap->a_retval = 32;
771 		break;
772 	default:
773 		return (EINVAL);
774 	}
775 
776 	return (0);
777 }
778 
779 static int
780 efs_advlock(void *v)
781 {
782 	struct vop_advlock_args /* {
783 		const struct vnodeop_desc *a_desc;
784 		struct vnode *a_vp;
785 		void *a_id;
786 		int a_op;
787 		struct flock *a_fl;
788 		int a_flags;
789 	} */ *ap = v;
790 	struct efs_inode *eip = EFS_VTOI(ap->a_vp);
791 
792 	return (lf_advlock(ap, &eip->ei_lockf, eip->ei_size));
793 }
794 
795 /* Global vfs data structures for efs */
796 int (**efs_vnodeop_p)(void *);
797 const struct vnodeopv_entry_desc efs_vnodeop_entries[] = {
798 	{ &vop_default_desc,	vn_default_error},	/* error handler */
799 	{ &vop_lookup_desc,	efs_lookup	},	/* lookup */
800 	{ &vop_create_desc,	genfs_eopnotsupp},	/* create */
801 	{ &vop_mknod_desc,	genfs_eopnotsupp},	/* mknod */
802 	{ &vop_open_desc,	genfs_nullop	},	/* open */
803 	{ &vop_close_desc,	genfs_nullop	},	/* close */
804 	{ &vop_access_desc,	efs_access	},	/* access */
805 	{ &vop_getattr_desc,	efs_getattr	},	/* getattr */
806 	{ &vop_setattr_desc,	genfs_eopnotsupp},	/* setattr */
807 	{ &vop_read_desc,	efs_read	},	/* read */
808 	{ &vop_write_desc,	genfs_eopnotsupp},	/* write */
809 	{ &vop_ioctl_desc,	genfs_enoioctl	},	/* ioctl */
810 	{ &vop_fcntl_desc,	genfs_fcntl	},	/* fcntl */
811 	{ &vop_poll_desc,	genfs_poll	},	/* poll */
812 	{ &vop_kqfilter_desc,	genfs_kqfilter	},	/* kqfilter */
813 	{ &vop_revoke_desc,	genfs_revoke	},	/* revoke */
814 	{ &vop_mmap_desc,	genfs_mmap	},	/* mmap */
815 	{ &vop_fsync_desc,	genfs_eopnotsupp},	/* fsync */
816 	{ &vop_seek_desc,	genfs_seek	},	/* seek */
817 	{ &vop_remove_desc,	genfs_eopnotsupp},	/* remove */
818 	{ &vop_link_desc,	genfs_eopnotsupp},	/* link */
819 	{ &vop_rename_desc,	genfs_eopnotsupp},	/* rename */
820 	{ &vop_mkdir_desc,	genfs_eopnotsupp},	/* mkdir */
821 	{ &vop_rmdir_desc,	genfs_eopnotsupp},	/* rmdir */
822 	{ &vop_symlink_desc,	genfs_eopnotsupp},	/* symlink */
823 	{ &vop_readdir_desc,	efs_readdir	},	/* readdir */
824 	{ &vop_readlink_desc,	efs_readlink	},	/* readlink */
825 	{ &vop_abortop_desc,	genfs_abortop	},	/* abortop */
826 	{ &vop_inactive_desc,	efs_inactive	},	/* inactive */
827 	{ &vop_reclaim_desc,	efs_reclaim	},	/* reclaim */
828 	{ &vop_lock_desc,	genfs_lock,	},	/* lock */
829 	{ &vop_unlock_desc,	genfs_unlock,	},	/* unlock */
830 	{ &vop_islocked_desc,	genfs_islocked,	},	/* islocked */
831 	{ &vop_bmap_desc,	efs_bmap	},	/* bmap */
832 	{ &vop_print_desc,	efs_print	},	/* print */
833 	{ &vop_pathconf_desc,	efs_pathconf	},	/* pathconf */
834 	{ &vop_advlock_desc,	efs_advlock	},	/* advlock */
835 							/* blkatoff */
836 							/* valloc */
837 							/* balloc */
838 							/* vfree */
839 							/* truncate */
840 							/* whiteout */
841 	{ &vop_getpages_desc,	genfs_getpages	},	/* getpages */
842 	{ &vop_putpages_desc,	genfs_putpages	},	/* putpages */
843 	{ &vop_bwrite_desc,	vn_bwrite	},	/* bwrite */
844 	{ &vop_strategy_desc,	efs_strategy	},	/* strategy */
845 	{ NULL, NULL }
846 };
847 const struct vnodeopv_desc efs_vnodeop_opv_desc = {
848 	&efs_vnodeop_p,
849 	efs_vnodeop_entries
850 };
851 
852 int (**efs_specop_p)(void *);
853 const struct vnodeopv_entry_desc efs_specop_entries[] = {
854 	{ &vop_default_desc,	vn_default_error},	/* error handler */
855 	{ &vop_lookup_desc,	spec_lookup	},	/* lookup */
856 	{ &vop_create_desc,	spec_create	},	/* create */
857 	{ &vop_mknod_desc,	spec_mknod	},	/* mknod */
858 	{ &vop_open_desc,	spec_open	},	/* open */
859 	{ &vop_close_desc,	spec_close	},	/* close */
860 	{ &vop_access_desc,	efs_access	},	/* access */
861 	{ &vop_getattr_desc,	efs_getattr	},	/* getattr */
862 	{ &vop_setattr_desc,	genfs_eopnotsupp},	/* setattr */
863 	{ &vop_read_desc,	spec_read	},	/* read */
864 	{ &vop_write_desc,	spec_write	},	/* write */
865 	{ &vop_ioctl_desc,	spec_ioctl	},	/* ioctl */
866 	{ &vop_fcntl_desc,	genfs_fcntl	},	/* fcntl */
867 	{ &vop_poll_desc,	spec_poll	},	/* poll */
868 	{ &vop_kqfilter_desc,	spec_kqfilter	},	/* kqfilter */
869 	{ &vop_revoke_desc,	spec_revoke	},	/* revoke */
870 	{ &vop_mmap_desc,	spec_mmap	},	/* mmap */
871 	{ &vop_fsync_desc,	spec_fsync	},	/* fsync */
872 	{ &vop_seek_desc,	spec_seek	},	/* seek */
873 	{ &vop_remove_desc,	spec_remove	},	/* remove */
874 	{ &vop_link_desc,	spec_link	},	/* link */
875 	{ &vop_rename_desc,	spec_rename	},	/* rename */
876 	{ &vop_mkdir_desc,	spec_mkdir	},	/* mkdir */
877 	{ &vop_rmdir_desc,	spec_rmdir	},	/* rmdir */
878 	{ &vop_symlink_desc,	spec_symlink	},	/* symlink */
879 	{ &vop_readdir_desc,	spec_readdir	},	/* readdir */
880 	{ &vop_readlink_desc,	spec_readlink	},	/* readlink */
881 	{ &vop_abortop_desc,	spec_abortop	},	/* abortop */
882 	{ &vop_inactive_desc,	efs_inactive	},	/* inactive */
883 	{ &vop_reclaim_desc,	efs_reclaim	},	/* reclaim */
884 	{ &vop_lock_desc,	genfs_lock,	},	/* lock */
885 	{ &vop_unlock_desc,	genfs_unlock,	},	/* unlock */
886 	{ &vop_islocked_desc,	genfs_islocked,	},	/* islocked */
887 	{ &vop_bmap_desc,	spec_bmap	},	/* bmap */
888 	{ &vop_print_desc,	efs_print	},	/* print */
889 	{ &vop_pathconf_desc,	spec_pathconf	},	/* pathconf */
890 	{ &vop_advlock_desc,	spec_advlock	},	/* advlock */
891 							/* blkatoff */
892 							/* valloc */
893 							/* balloc */
894 							/* vfree */
895 							/* truncate */
896 							/* whiteout */
897 	{ &vop_getpages_desc,	spec_getpages	},	/* getpages */
898 	{ &vop_putpages_desc,	spec_putpages	},	/* putpages */
899 	{ &vop_bwrite_desc,	vn_bwrite	},	/* bwrite */
900 	{ &vop_strategy_desc,	spec_strategy	},	/* strategy */
901 	{ NULL, NULL }
902 };
903 const struct vnodeopv_desc efs_specop_opv_desc = {
904 	&efs_specop_p,
905 	efs_specop_entries
906 };
907 
908 int (**efs_fifoop_p)(void *);
909 const struct vnodeopv_entry_desc efs_fifoop_entries[] = {
910 	{ &vop_default_desc,	vn_default_error},	/* error handler */
911 	{ &vop_lookup_desc,	vn_fifo_bypass	},	/* lookup */
912 	{ &vop_create_desc,	vn_fifo_bypass	},	/* create */
913 	{ &vop_mknod_desc,	vn_fifo_bypass	},	/* mknod */
914 	{ &vop_open_desc,	vn_fifo_bypass	},	/* open */
915 	{ &vop_close_desc,	vn_fifo_bypass	},	/* close */
916 	{ &vop_access_desc,	efs_access	},	/* access */
917 	{ &vop_getattr_desc,	efs_getattr	},	/* getattr */
918 	{ &vop_setattr_desc,	genfs_eopnotsupp},	/* setattr */
919 	{ &vop_read_desc,	vn_fifo_bypass	},	/* read */
920 	{ &vop_write_desc,	vn_fifo_bypass	},	/* write */
921 	{ &vop_ioctl_desc,	vn_fifo_bypass	},	/* ioctl */
922 	{ &vop_fcntl_desc,	genfs_fcntl	},	/* fcntl */
923 	{ &vop_poll_desc,	vn_fifo_bypass	},	/* poll */
924 	{ &vop_kqfilter_desc,	vn_fifo_bypass	},	/* kqfilter */
925 	{ &vop_revoke_desc,	vn_fifo_bypass	},	/* revoke */
926 	{ &vop_mmap_desc,	vn_fifo_bypass	},	/* mmap */
927 	{ &vop_fsync_desc,	vn_fifo_bypass	},	/* fsync */
928 	{ &vop_seek_desc,	vn_fifo_bypass	},	/* seek */
929 	{ &vop_remove_desc,	vn_fifo_bypass	},	/* remove */
930 	{ &vop_link_desc,	vn_fifo_bypass	},	/* link */
931 	{ &vop_rename_desc,	vn_fifo_bypass	},	/* rename */
932 	{ &vop_mkdir_desc,	vn_fifo_bypass	},	/* mkdir */
933 	{ &vop_rmdir_desc,	vn_fifo_bypass	},	/* rmdir */
934 	{ &vop_symlink_desc,	vn_fifo_bypass	},	/* symlink */
935 	{ &vop_readdir_desc,	vn_fifo_bypass	},	/* readdir */
936 	{ &vop_readlink_desc,	vn_fifo_bypass	},	/* readlink */
937 	{ &vop_abortop_desc,	vn_fifo_bypass	},	/* abortop */
938 	{ &vop_inactive_desc,	efs_inactive	},	/* inactive */
939 	{ &vop_reclaim_desc,	efs_reclaim	},	/* reclaim */
940 	{ &vop_lock_desc,	genfs_lock,	},	/* lock */
941 	{ &vop_unlock_desc,	genfs_unlock,	},	/* unlock */
942 	{ &vop_islocked_desc,	genfs_islocked,	},	/* islocked */
943 	{ &vop_bmap_desc,	vn_fifo_bypass	},	/* bmap */
944 	{ &vop_print_desc,	efs_print	},	/* print */
945 	{ &vop_pathconf_desc,	vn_fifo_bypass	},	/* pathconf */
946 	{ &vop_advlock_desc,	vn_fifo_bypass	},	/* advlock */
947 							/* blkatoff */
948 							/* valloc */
949 							/* balloc */
950 							/* vfree */
951 							/* truncate */
952 							/* whiteout */
953 	{ &vop_bwrite_desc,	vn_bwrite	},	/* bwrite */
954 	{ &vop_strategy_desc,	vn_fifo_bypass	},	/* strategy */
955 	{ NULL, NULL }
956 };
957 const struct vnodeopv_desc efs_fifoop_opv_desc = {
958 	&efs_fifoop_p,
959 	efs_fifoop_entries
960 };
961