Commit | Line | Data |
---|---|---|
3c4390e8 KM |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
3c4390e8 | 6 | * |
021de758 | 7 | * @(#)vfs_subr.c 7.83 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
cb796a23 | 14 | #include <sys/param.h> |
917dc539 | 15 | #include <sys/systm.h> |
cb796a23 KB |
16 | #include <sys/proc.h> |
17 | #include <sys/mount.h> | |
18 | #include <sys/time.h> | |
19 | #include <sys/vnode.h> | |
807cc430 | 20 | #include <sys/stat.h> |
cb796a23 KB |
21 | #include <sys/namei.h> |
22 | #include <sys/ucred.h> | |
23 | #include <sys/buf.h> | |
24 | #include <sys/errno.h> | |
25 | #include <sys/malloc.h> | |
3c4390e8 | 26 | |
021de758 JSP |
27 | #include <miscfs/specfs/specdev.h> |
28 | ||
807cc430 KM |
29 | enum vtype iftovt_tab[16] = { |
30 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
31 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
32 | }; | |
33 | int vttoif_tab[9] = { | |
34 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
35 | S_IFSOCK, S_IFIFO, S_IFMT, | |
36 | }; | |
37 | ||
3c4390e8 KM |
38 | /* |
39 | * Remove a mount point from the list of mounted filesystems. | |
40 | * Unmount of the root is illegal. | |
41 | */ | |
42 | void | |
43 | vfs_remove(mp) | |
44 | register struct mount *mp; | |
45 | { | |
46 | ||
47 | if (mp == rootfs) | |
48 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
49 | mp->mnt_prev->mnt_next = mp->mnt_next; |
50 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
51 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
52 | vfs_unlock(mp); |
53 | } | |
54 | ||
55 | /* | |
56 | * Lock a filesystem. | |
57 | * Used to prevent access to it while mounting and unmounting. | |
58 | */ | |
59 | vfs_lock(mp) | |
60 | register struct mount *mp; | |
61 | { | |
62 | ||
54fb9dc2 KM |
63 | while(mp->mnt_flag & MNT_MLOCK) { |
64 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
65 | sleep((caddr_t)mp, PVFS); |
66 | } | |
54fb9dc2 | 67 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
68 | return (0); |
69 | } | |
70 | ||
71 | /* | |
72 | * Unlock a locked filesystem. | |
73 | * Panic if filesystem is not locked. | |
74 | */ | |
75 | void | |
76 | vfs_unlock(mp) | |
77 | register struct mount *mp; | |
78 | { | |
79 | ||
54fb9dc2 | 80 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 81 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
82 | mp->mnt_flag &= ~MNT_MLOCK; |
83 | if (mp->mnt_flag & MNT_MWAIT) { | |
84 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
85 | wakeup((caddr_t)mp); |
86 | } | |
87 | } | |
88 | ||
36ef03ec KM |
89 | /* |
90 | * Mark a mount point as busy. | |
91 | * Used to synchronize access and to delay unmounting. | |
92 | */ | |
93 | vfs_busy(mp) | |
94 | register struct mount *mp; | |
95 | { | |
96 | ||
54fb9dc2 KM |
97 | while(mp->mnt_flag & MNT_MPBUSY) { |
98 | mp->mnt_flag |= MNT_MPWANT; | |
99 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 100 | } |
d8b63609 KM |
101 | if (mp->mnt_flag & MNT_UNMOUNT) |
102 | return (1); | |
54fb9dc2 | 103 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
104 | return (0); |
105 | } | |
106 | ||
107 | /* | |
108 | * Free a busy filesystem. | |
109 | * Panic if filesystem is not busy. | |
110 | */ | |
36ef03ec KM |
111 | vfs_unbusy(mp) |
112 | register struct mount *mp; | |
113 | { | |
114 | ||
54fb9dc2 | 115 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 116 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
117 | mp->mnt_flag &= ~MNT_MPBUSY; |
118 | if (mp->mnt_flag & MNT_MPWANT) { | |
119 | mp->mnt_flag &= ~MNT_MPWANT; | |
120 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
121 | } |
122 | } | |
123 | ||
3c4390e8 KM |
124 | /* |
125 | * Lookup a mount point by filesystem identifier. | |
126 | */ | |
127 | struct mount * | |
128 | getvfs(fsid) | |
129 | fsid_t *fsid; | |
130 | { | |
131 | register struct mount *mp; | |
132 | ||
d713f801 KM |
133 | mp = rootfs; |
134 | do { | |
54fb9dc2 KM |
135 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
136 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 137 | return (mp); |
3c4390e8 | 138 | } |
54fb9dc2 | 139 | mp = mp->mnt_next; |
d713f801 KM |
140 | } while (mp != rootfs); |
141 | return ((struct mount *)0); | |
3c4390e8 KM |
142 | } |
143 | ||
917dc539 JSP |
144 | /* |
145 | * Get a new unique fsid | |
146 | */ | |
147 | void | |
148 | getnewfsid(mp, mtype) | |
149 | struct mount *mp; | |
150 | int mtype; | |
151 | { | |
152 | static u_short xxxfs_mntid; | |
153 | ||
154 | fsid_t tfsid; | |
155 | ||
156 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */ | |
157 | mp->mnt_stat.f_fsid.val[1] = mtype; | |
158 | if (xxxfs_mntid == 0) | |
159 | ++xxxfs_mntid; | |
160 | tfsid.val[0] = makedev(nblkdev, xxxfs_mntid); | |
161 | tfsid.val[1] = mtype; | |
17fd1cc7 JSP |
162 | if (rootfs) { |
163 | while (getvfs(&tfsid)) { | |
164 | tfsid.val[0]++; | |
165 | xxxfs_mntid++; | |
166 | } | |
917dc539 JSP |
167 | } |
168 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
169 | } | |
170 | ||
3c4390e8 KM |
171 | /* |
172 | * Set vnode attributes to VNOVAL | |
173 | */ | |
174 | void vattr_null(vap) | |
175 | register struct vattr *vap; | |
176 | { | |
177 | ||
178 | vap->va_type = VNON; | |
83504fd5 | 179 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 180 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
181 | vap->va_fsid = vap->va_fileid = |
182 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
183 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
184 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
185 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 186 | vap->va_flags = vap->va_gen = VNOVAL; |
3c4390e8 | 187 | } |
c60798ca | 188 | |
36d09cb1 KM |
189 | /* |
190 | * Routines having to do with the management of the vnode table. | |
191 | */ | |
e781da98 | 192 | extern struct vnode *vfreeh, **vfreet; |
9342689a JH |
193 | extern int (**dead_vnodeop_p)(); |
194 | extern int (**spec_vnodeop_p)(); | |
32339c94 | 195 | extern void vclean(); |
1a80f56e | 196 | long numvnodes; |
e781da98 | 197 | extern struct vattr va_null; |
36d09cb1 KM |
198 | |
199 | /* | |
200 | * Return the next vnode from the free list. | |
201 | */ | |
202 | getnewvnode(tag, mp, vops, vpp) | |
203 | enum vtagtype tag; | |
204 | struct mount *mp; | |
cf74dd57 | 205 | int (**vops)(); |
36d09cb1 KM |
206 | struct vnode **vpp; |
207 | { | |
208 | register struct vnode *vp, *vq; | |
209 | ||
ecf75a7d KM |
210 | if ((vfreeh == NULL && numvnodes < 2 * desiredvnodes) || |
211 | numvnodes < desiredvnodes) { | |
aacc1bff KM |
212 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
213 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
214 | bzero((char *)vp, sizeof *vp); |
215 | numvnodes++; | |
216 | } else { | |
217 | if ((vp = vfreeh) == NULL) { | |
218 | tablefull("vnode"); | |
219 | *vpp = 0; | |
220 | return (ENFILE); | |
221 | } | |
222 | if (vp->v_usecount) | |
223 | panic("free vnode isn't"); | |
224 | if (vq = vp->v_freef) | |
225 | vq->v_freeb = &vfreeh; | |
226 | else | |
227 | vfreet = &vfreeh; | |
228 | vfreeh = vq; | |
229 | vp->v_freef = NULL; | |
230 | vp->v_freeb = NULL; | |
39b99eb6 | 231 | vp->v_lease = NULL; |
1a80f56e KM |
232 | if (vp->v_type != VBAD) |
233 | vgone(vp); | |
2345b093 KM |
234 | if (vp->v_data) |
235 | panic("cleaned vnode isn't"); | |
1a80f56e | 236 | vp->v_flag = 0; |
1a80f56e KM |
237 | vp->v_lastr = 0; |
238 | vp->v_socket = 0; | |
36d09cb1 | 239 | } |
b027498b | 240 | vp->v_type = VNON; |
36d09cb1 KM |
241 | cache_purge(vp); |
242 | vp->v_tag = tag; | |
ef24f6dd | 243 | vp->v_op = vops; |
36d09cb1 KM |
244 | insmntque(vp, mp); |
245 | VREF(vp); | |
246 | *vpp = vp; | |
247 | return (0); | |
248 | } | |
249 | ||
250 | /* | |
251 | * Move a vnode from one mount queue to another. | |
252 | */ | |
253 | insmntque(vp, mp) | |
254 | register struct vnode *vp; | |
255 | register struct mount *mp; | |
256 | { | |
8136adfc | 257 | register struct vnode *vq; |
36d09cb1 KM |
258 | |
259 | /* | |
260 | * Delete from old mount point vnode list, if on one. | |
261 | */ | |
262 | if (vp->v_mountb) { | |
263 | if (vq = vp->v_mountf) | |
264 | vq->v_mountb = vp->v_mountb; | |
265 | *vp->v_mountb = vq; | |
266 | } | |
267 | /* | |
268 | * Insert into list of vnodes for the new mount point, if available. | |
269 | */ | |
a45ff315 | 270 | vp->v_mount = mp; |
36d09cb1 KM |
271 | if (mp == NULL) { |
272 | vp->v_mountf = NULL; | |
273 | vp->v_mountb = NULL; | |
274 | return; | |
275 | } | |
8136adfc KM |
276 | if (vq = mp->mnt_mounth) |
277 | vq->v_mountb = &vp->v_mountf; | |
278 | vp->v_mountf = vq; | |
279 | vp->v_mountb = &mp->mnt_mounth; | |
280 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
281 | } |
282 | ||
76429560 KM |
283 | /* |
284 | * Update outstanding I/O count and do wakeup if requested. | |
285 | */ | |
286 | vwakeup(bp) | |
287 | register struct buf *bp; | |
288 | { | |
289 | register struct vnode *vp; | |
290 | ||
291 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
292 | if (vp = bp->b_vp) { | |
293 | vp->v_numoutput--; | |
294 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
295 | if (vp->v_numoutput < 0) | |
296 | panic("vwakeup: neg numoutput"); | |
297 | vp->v_flag &= ~VBWAIT; | |
298 | wakeup((caddr_t)&vp->v_numoutput); | |
299 | } | |
300 | } | |
301 | } | |
302 | ||
76429560 KM |
303 | /* |
304 | * Flush out and invalidate all buffers associated with a vnode. | |
305 | * Called with the underlying object locked. | |
306 | */ | |
d024c2ce KM |
307 | int |
308 | vinvalbuf(vp, save, cred, p) | |
76429560 KM |
309 | register struct vnode *vp; |
310 | int save; | |
d024c2ce KM |
311 | struct ucred *cred; |
312 | struct proc *p; | |
76429560 KM |
313 | { |
314 | register struct buf *bp; | |
315 | struct buf *nbp, *blist; | |
d024c2ce | 316 | int s, error; |
76429560 | 317 | |
d024c2ce KM |
318 | if (save) { |
319 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) | |
320 | return (error); | |
321 | if (vp->v_dirtyblkhd != NULL) | |
322 | panic("vinvalbuf: dirty bufs"); | |
323 | } | |
76429560 | 324 | for (;;) { |
d024c2ce | 325 | if (blist = vp->v_cleanblkhd) |
76429560 | 326 | /* void */; |
d024c2ce | 327 | else if (blist = vp->v_dirtyblkhd) |
76429560 KM |
328 | /* void */; |
329 | else | |
330 | break; | |
331 | for (bp = blist; bp; bp = nbp) { | |
332 | nbp = bp->b_blockf; | |
333 | s = splbio(); | |
334 | if (bp->b_flags & B_BUSY) { | |
335 | bp->b_flags |= B_WANTED; | |
336 | sleep((caddr_t)bp, PRIBIO + 1); | |
337 | splx(s); | |
338 | break; | |
339 | } | |
340 | bremfree(bp); | |
341 | bp->b_flags |= B_BUSY; | |
342 | splx(s); | |
76429560 KM |
343 | if (bp->b_vp != vp) |
344 | reassignbuf(bp, bp->b_vp); | |
345 | else | |
346 | bp->b_flags |= B_INVAL; | |
347 | brelse(bp); | |
348 | } | |
349 | } | |
350 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
351 | panic("vinvalbuf: flush failed"); | |
d024c2ce | 352 | return (0); |
76429560 KM |
353 | } |
354 | ||
355 | /* | |
356 | * Associate a buffer with a vnode. | |
357 | */ | |
358 | bgetvp(vp, bp) | |
359 | register struct vnode *vp; | |
360 | register struct buf *bp; | |
361 | { | |
8136adfc KM |
362 | register struct vnode *vq; |
363 | register struct buf *bq; | |
76429560 KM |
364 | |
365 | if (bp->b_vp) | |
366 | panic("bgetvp: not free"); | |
367 | VHOLD(vp); | |
368 | bp->b_vp = vp; | |
369 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
370 | bp->b_dev = vp->v_rdev; | |
371 | else | |
372 | bp->b_dev = NODEV; | |
373 | /* | |
374 | * Insert onto list for new vnode. | |
375 | */ | |
8136adfc KM |
376 | if (bq = vp->v_cleanblkhd) |
377 | bq->b_blockb = &bp->b_blockf; | |
378 | bp->b_blockf = bq; | |
379 | bp->b_blockb = &vp->v_cleanblkhd; | |
380 | vp->v_cleanblkhd = bp; | |
76429560 KM |
381 | } |
382 | ||
383 | /* | |
384 | * Disassociate a buffer from a vnode. | |
385 | */ | |
386 | brelvp(bp) | |
387 | register struct buf *bp; | |
388 | { | |
389 | struct buf *bq; | |
390 | struct vnode *vp; | |
391 | ||
392 | if (bp->b_vp == (struct vnode *) 0) | |
393 | panic("brelvp: NULL"); | |
394 | /* | |
395 | * Delete from old vnode list, if on one. | |
396 | */ | |
397 | if (bp->b_blockb) { | |
398 | if (bq = bp->b_blockf) | |
399 | bq->b_blockb = bp->b_blockb; | |
400 | *bp->b_blockb = bq; | |
401 | bp->b_blockf = NULL; | |
402 | bp->b_blockb = NULL; | |
403 | } | |
404 | vp = bp->b_vp; | |
405 | bp->b_vp = (struct vnode *) 0; | |
406 | HOLDRELE(vp); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Reassign a buffer from one vnode to another. | |
411 | * Used to assign file specific control information | |
412 | * (indirect blocks) to the vnode to which they belong. | |
413 | */ | |
414 | reassignbuf(bp, newvp) | |
415 | register struct buf *bp; | |
416 | register struct vnode *newvp; | |
417 | { | |
418 | register struct buf *bq, **listheadp; | |
419 | ||
e5c3f16e KM |
420 | if (newvp == NULL) { |
421 | printf("reassignbuf: NULL"); | |
422 | return; | |
423 | } | |
76429560 KM |
424 | /* |
425 | * Delete from old vnode list, if on one. | |
426 | */ | |
427 | if (bp->b_blockb) { | |
428 | if (bq = bp->b_blockf) | |
429 | bq->b_blockb = bp->b_blockb; | |
430 | *bp->b_blockb = bq; | |
431 | } | |
432 | /* | |
433 | * If dirty, put on list of dirty buffers; | |
434 | * otherwise insert onto list of clean buffers. | |
435 | */ | |
436 | if (bp->b_flags & B_DELWRI) | |
437 | listheadp = &newvp->v_dirtyblkhd; | |
438 | else | |
439 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
440 | if (bq = *listheadp) |
441 | bq->b_blockb = &bp->b_blockf; | |
442 | bp->b_blockf = bq; | |
443 | bp->b_blockb = listheadp; | |
444 | *listheadp = bp; | |
76429560 KM |
445 | } |
446 | ||
36d09cb1 | 447 | /* |
ef24f6dd KM |
448 | * Create a vnode for a block device. |
449 | * Used for root filesystem, argdev, and swap areas. | |
450 | * Also used for memory file system special devices. | |
451 | */ | |
452 | bdevvp(dev, vpp) | |
453 | dev_t dev; | |
454 | struct vnode **vpp; | |
455 | { | |
ef24f6dd KM |
456 | register struct vnode *vp; |
457 | struct vnode *nvp; | |
458 | int error; | |
459 | ||
1c89915d KM |
460 | if (dev == NODEV) |
461 | return (0); | |
9342689a | 462 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
463 | if (error) { |
464 | *vpp = 0; | |
465 | return (error); | |
466 | } | |
467 | vp = nvp; | |
468 | vp->v_type = VBLK; | |
c0de8792 | 469 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
470 | vput(vp); |
471 | vp = nvp; | |
472 | } | |
473 | *vpp = vp; | |
474 | return (0); | |
475 | } | |
476 | ||
477 | /* | |
478 | * Check to see if the new vnode represents a special device | |
479 | * for which we already have a vnode (either because of | |
480 | * bdevvp() or because of a different vnode representing | |
481 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 482 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
483 | * caller is responsible for filling it with its new contents. |
484 | */ | |
485 | struct vnode * | |
c0de8792 | 486 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 487 | register struct vnode *nvp; |
c0de8792 | 488 | dev_t nvp_rdev; |
ef24f6dd KM |
489 | struct mount *mp; |
490 | { | |
491 | register struct vnode *vp; | |
c0de8792 | 492 | struct vnode **vpp; |
ef24f6dd KM |
493 | |
494 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 495 | return (NULLVP); |
c0de8792 KM |
496 | |
497 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 498 | loop: |
c0de8792 KM |
499 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
500 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 501 | continue; |
c0de8792 KM |
502 | /* |
503 | * Alias, but not in use, so flush it out. | |
504 | */ | |
7f7b7d89 | 505 | if (vp->v_usecount == 0) { |
c0de8792 KM |
506 | vgone(vp); |
507 | goto loop; | |
508 | } | |
ef62830d KM |
509 | if (vget(vp)) |
510 | goto loop; | |
ef24f6dd KM |
511 | break; |
512 | } | |
c0de8792 | 513 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
514 | MALLOC(nvp->v_specinfo, struct specinfo *, |
515 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
516 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 517 | nvp->v_hashchain = vpp; |
c0de8792 | 518 | nvp->v_specnext = *vpp; |
2c957a90 | 519 | nvp->v_specflags = 0; |
c0de8792 | 520 | *vpp = nvp; |
40452d5e KM |
521 | if (vp != NULL) { |
522 | nvp->v_flag |= VALIASED; | |
523 | vp->v_flag |= VALIASED; | |
524 | vput(vp); | |
525 | } | |
54fb9dc2 | 526 | return (NULLVP); |
ef24f6dd | 527 | } |
2bae1875 KM |
528 | VOP_UNLOCK(vp); |
529 | vclean(vp, 0); | |
ef24f6dd KM |
530 | vp->v_op = nvp->v_op; |
531 | vp->v_tag = nvp->v_tag; | |
532 | nvp->v_type = VNON; | |
533 | insmntque(vp, mp); | |
534 | return (vp); | |
535 | } | |
536 | ||
537 | /* | |
538 | * Grab a particular vnode from the free list, increment its | |
539 | * reference count and lock it. The vnode lock bit is set the | |
540 | * vnode is being eliminated in vgone. The process is awakened | |
541 | * when the transition is completed, and an error returned to | |
542 | * indicate that the vnode is no longer usable (possibly having | |
543 | * been changed to a new file system type). | |
36d09cb1 KM |
544 | */ |
545 | vget(vp) | |
546 | register struct vnode *vp; | |
547 | { | |
548 | register struct vnode *vq; | |
549 | ||
ef24f6dd KM |
550 | if (vp->v_flag & VXLOCK) { |
551 | vp->v_flag |= VXWANT; | |
552 | sleep((caddr_t)vp, PINOD); | |
553 | return (1); | |
554 | } | |
7f7b7d89 | 555 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
556 | if (vq = vp->v_freef) |
557 | vq->v_freeb = vp->v_freeb; | |
558 | else | |
559 | vfreet = vp->v_freeb; | |
560 | *vp->v_freeb = vq; | |
561 | vp->v_freef = NULL; | |
562 | vp->v_freeb = NULL; | |
563 | } | |
36d09cb1 | 564 | VREF(vp); |
ef24f6dd KM |
565 | VOP_LOCK(vp); |
566 | return (0); | |
36d09cb1 KM |
567 | } |
568 | ||
d32390ea KM |
569 | int bug_refs = 0; |
570 | ||
36d09cb1 KM |
571 | /* |
572 | * Vnode reference, just increment the count | |
573 | */ | |
574 | void vref(vp) | |
575 | struct vnode *vp; | |
576 | { | |
577 | ||
7f7b7d89 | 578 | vp->v_usecount++; |
d32390ea KM |
579 | if (vp->v_type != VBLK && curproc) |
580 | curproc->p_spare[0]++; | |
581 | if (bug_refs) | |
582 | vprint("vref: "); | |
36d09cb1 KM |
583 | } |
584 | ||
585 | /* | |
586 | * vput(), just unlock and vrele() | |
587 | */ | |
588 | void vput(vp) | |
589 | register struct vnode *vp; | |
590 | { | |
4d1ee2eb | 591 | |
36d09cb1 KM |
592 | VOP_UNLOCK(vp); |
593 | vrele(vp); | |
594 | } | |
595 | ||
596 | /* | |
597 | * Vnode release. | |
598 | * If count drops to zero, call inactive routine and return to freelist. | |
599 | */ | |
600 | void vrele(vp) | |
601 | register struct vnode *vp; | |
602 | { | |
603 | ||
65c3b3a8 | 604 | #ifdef DIAGNOSTIC |
36d09cb1 | 605 | if (vp == NULL) |
ef24f6dd | 606 | panic("vrele: null vp"); |
65c3b3a8 | 607 | #endif |
7f7b7d89 | 608 | vp->v_usecount--; |
d32390ea KM |
609 | if (vp->v_type != VBLK && curproc) |
610 | curproc->p_spare[0]--; | |
611 | if (bug_refs) | |
612 | vprint("vref: "); | |
7f7b7d89 | 613 | if (vp->v_usecount > 0) |
36d09cb1 | 614 | return; |
65c3b3a8 KM |
615 | #ifdef DIAGNOSTIC |
616 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
617 | vprint("vrele: bad ref count", vp); | |
618 | panic("vrele: ref cnt"); | |
619 | } | |
620 | #endif | |
54fb9dc2 | 621 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
622 | /* |
623 | * insert into empty list | |
624 | */ | |
625 | vfreeh = vp; | |
626 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
627 | } else { |
628 | /* | |
629 | * insert at tail of list | |
630 | */ | |
631 | *vfreet = vp; | |
632 | vp->v_freeb = vfreet; | |
36d09cb1 | 633 | } |
ef24f6dd KM |
634 | vp->v_freef = NULL; |
635 | vfreet = &vp->v_freef; | |
d024c2ce | 636 | VOP_INACTIVE(vp); |
ef24f6dd KM |
637 | } |
638 | ||
7f7b7d89 KM |
639 | /* |
640 | * Page or buffer structure gets a reference. | |
641 | */ | |
451df175 | 642 | void vhold(vp) |
7f7b7d89 KM |
643 | register struct vnode *vp; |
644 | { | |
645 | ||
646 | vp->v_holdcnt++; | |
647 | } | |
648 | ||
649 | /* | |
650 | * Page or buffer structure frees a reference. | |
651 | */ | |
451df175 | 652 | void holdrele(vp) |
7f7b7d89 KM |
653 | register struct vnode *vp; |
654 | { | |
655 | ||
656 | if (vp->v_holdcnt <= 0) | |
657 | panic("holdrele: holdcnt"); | |
658 | vp->v_holdcnt--; | |
659 | } | |
660 | ||
f0556f86 KM |
661 | /* |
662 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
663 | * | |
664 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
665 | * return error if any are found (nb: this is a user error, not a | |
666 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
667 | * that are found. | |
668 | */ | |
669 | int busyprt = 0; /* patch to print out busy vnodes */ | |
670 | ||
671 | vflush(mp, skipvp, flags) | |
672 | struct mount *mp; | |
673 | struct vnode *skipvp; | |
674 | int flags; | |
675 | { | |
676 | register struct vnode *vp, *nvp; | |
677 | int busy = 0; | |
678 | ||
54fb9dc2 | 679 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 680 | panic("vflush: not busy"); |
4597dd33 | 681 | loop: |
54fb9dc2 | 682 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
683 | if (vp->v_mount != mp) |
684 | goto loop; | |
f0556f86 KM |
685 | nvp = vp->v_mountf; |
686 | /* | |
687 | * Skip over a selected vnode. | |
f0556f86 KM |
688 | */ |
689 | if (vp == skipvp) | |
690 | continue; | |
36ef03ec KM |
691 | /* |
692 | * Skip over a vnodes marked VSYSTEM. | |
693 | */ | |
694 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
695 | continue; | |
f0556f86 | 696 | /* |
7f7b7d89 | 697 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
698 | * out the vnode data structures and we are done. |
699 | */ | |
7f7b7d89 | 700 | if (vp->v_usecount == 0) { |
f0556f86 KM |
701 | vgone(vp); |
702 | continue; | |
703 | } | |
704 | /* | |
705 | * For block or character devices, revert to an | |
706 | * anonymous device. For all other files, just kill them. | |
707 | */ | |
36ef03ec | 708 | if (flags & FORCECLOSE) { |
f0556f86 KM |
709 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
710 | vgone(vp); | |
711 | } else { | |
712 | vclean(vp, 0); | |
9342689a | 713 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
714 | insmntque(vp, (struct mount *)0); |
715 | } | |
716 | continue; | |
717 | } | |
718 | if (busyprt) | |
0bf84b18 | 719 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
720 | busy++; |
721 | } | |
722 | if (busy) | |
723 | return (EBUSY); | |
724 | return (0); | |
725 | } | |
726 | ||
ef24f6dd KM |
727 | /* |
728 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 729 | */ |
ecf75a7d KM |
730 | void |
731 | vclean(vp, flags) | |
ef24f6dd | 732 | register struct vnode *vp; |
aacc1bff | 733 | int flags; |
ef24f6dd | 734 | { |
4a6391bf KM |
735 | struct vop_inactive_args vop_inactive_a; |
736 | struct vop_reclaim_args vop_reclaim_a; | |
737 | struct vop_unlock_args vop_unlock_a; | |
738 | struct vop_close_args vop_close_a; | |
38c46eee | 739 | int (**origops)(); |
2bae1875 | 740 | int active; |
ef24f6dd | 741 | |
2bae1875 KM |
742 | /* |
743 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
744 | * If so we have to reference it before we clean it out |
745 | * so that its count cannot fall to zero and generate a | |
746 | * race against ourselves to recycle it. | |
2bae1875 | 747 | */ |
7f7b7d89 | 748 | if (active = vp->v_usecount) |
2bae1875 | 749 | VREF(vp); |
2bae1875 KM |
750 | /* |
751 | * Prevent the vnode from being recycled or | |
752 | * brought into use while we clean it out. | |
753 | */ | |
0bf84b18 KM |
754 | if (vp->v_flag & VXLOCK) |
755 | panic("vclean: deadlock"); | |
ef24f6dd | 756 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
757 | /* |
758 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
759 | * have the object locked while it cleans it out. The VOP_LOCK | |
760 | * ensures that the VOP_INACTIVE routine is done with its work. | |
761 | * For active vnodes, it ensures that no other activity can | |
762 | * occur while the buffer list is being cleaned out. | |
763 | */ | |
764 | VOP_LOCK(vp); | |
36ef03ec | 765 | if (flags & DOCLOSE) |
d024c2ce | 766 | vinvalbuf(vp, 1, NOCRED, NULL); |
ef24f6dd KM |
767 | /* |
768 | * Prevent any further operations on the vnode from | |
769 | * being passed through to the old file system. | |
770 | */ | |
771 | origops = vp->v_op; | |
9342689a | 772 | vp->v_op = dead_vnodeop_p; |
ef24f6dd KM |
773 | vp->v_tag = VT_NON; |
774 | /* | |
2bae1875 KM |
775 | * If purging an active vnode, it must be unlocked, closed, |
776 | * and deactivated before being reclaimed. | |
ef24f6dd | 777 | */ |
38c46eee JH |
778 | vop_unlock_a.a_desc = VDESC(vop_unlock); |
779 | vop_unlock_a.a_vp = vp; | |
780 | VOCALL(origops,VOFFSET(vop_unlock),&vop_unlock_a); | |
2bae1875 | 781 | if (active) { |
38c46eee JH |
782 | /* |
783 | * Note: these next two calls imply | |
784 | * that vop_close and vop_inactive implementations | |
785 | * cannot count on the ops vector being correctly | |
786 | * set. | |
787 | */ | |
788 | if (flags & DOCLOSE) { | |
789 | vop_close_a.a_desc = VDESC(vop_close); | |
790 | vop_close_a.a_vp = vp; | |
791 | vop_close_a.a_fflag = IO_NDELAY; | |
d024c2ce | 792 | vop_close_a.a_p = NULL; |
38c46eee JH |
793 | VOCALL(origops,VOFFSET(vop_close),&vop_close_a); |
794 | }; | |
795 | vop_inactive_a.a_desc = VDESC(vop_inactive); | |
796 | vop_inactive_a.a_vp = vp; | |
38c46eee | 797 | VOCALL(origops,VOFFSET(vop_inactive),&vop_inactive_a); |
ef24f6dd KM |
798 | } |
799 | /* | |
800 | * Reclaim the vnode. | |
801 | */ | |
38c46eee JH |
802 | /* |
803 | * Emulate VOP_RECLAIM. | |
804 | */ | |
805 | vop_reclaim_a.a_desc = VDESC(vop_reclaim); | |
806 | vop_reclaim_a.a_vp = vp; | |
807 | if (VOCALL(origops,VOFFSET(vop_reclaim),&vop_reclaim_a)) | |
ef24f6dd | 808 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
809 | if (active) |
810 | vrele(vp); | |
38c46eee | 811 | |
ef24f6dd KM |
812 | /* |
813 | * Done with purge, notify sleepers in vget of the grim news. | |
814 | */ | |
815 | vp->v_flag &= ~VXLOCK; | |
816 | if (vp->v_flag & VXWANT) { | |
817 | vp->v_flag &= ~VXWANT; | |
818 | wakeup((caddr_t)vp); | |
819 | } | |
820 | } | |
821 | ||
ef62830d KM |
822 | /* |
823 | * Eliminate all activity associated with the requested vnode | |
824 | * and with all vnodes aliased to the requested vnode. | |
825 | */ | |
826 | void vgoneall(vp) | |
827 | register struct vnode *vp; | |
828 | { | |
7f7b7d89 | 829 | register struct vnode *vq; |
ef62830d | 830 | |
7a7b3a95 KM |
831 | if (vp->v_flag & VALIASED) { |
832 | /* | |
833 | * If a vgone (or vclean) is already in progress, | |
834 | * wait until it is done and return. | |
835 | */ | |
836 | if (vp->v_flag & VXLOCK) { | |
837 | vp->v_flag |= VXWANT; | |
838 | sleep((caddr_t)vp, PINOD); | |
839 | return; | |
840 | } | |
841 | /* | |
842 | * Ensure that vp will not be vgone'd while we | |
843 | * are eliminating its aliases. | |
844 | */ | |
845 | vp->v_flag |= VXLOCK; | |
846 | while (vp->v_flag & VALIASED) { | |
847 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
848 | if (vq->v_rdev != vp->v_rdev || | |
849 | vq->v_type != vp->v_type || vp == vq) | |
850 | continue; | |
851 | vgone(vq); | |
852 | break; | |
853 | } | |
ef62830d | 854 | } |
7a7b3a95 KM |
855 | /* |
856 | * Remove the lock so that vgone below will | |
857 | * really eliminate the vnode after which time | |
858 | * vgone will awaken any sleepers. | |
859 | */ | |
860 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
861 | } |
862 | vgone(vp); | |
863 | } | |
864 | ||
ef24f6dd KM |
865 | /* |
866 | * Eliminate all activity associated with a vnode | |
867 | * in preparation for reuse. | |
868 | */ | |
869 | void vgone(vp) | |
870 | register struct vnode *vp; | |
871 | { | |
7f7b7d89 | 872 | register struct vnode *vq; |
c0de8792 | 873 | struct vnode *vx; |
ef24f6dd | 874 | |
4f55e3ec KM |
875 | /* |
876 | * If a vgone (or vclean) is already in progress, | |
877 | * wait until it is done and return. | |
878 | */ | |
879 | if (vp->v_flag & VXLOCK) { | |
880 | vp->v_flag |= VXWANT; | |
881 | sleep((caddr_t)vp, PINOD); | |
882 | return; | |
883 | } | |
ef24f6dd KM |
884 | /* |
885 | * Clean out the filesystem specific data. | |
886 | */ | |
36ef03ec | 887 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
888 | /* |
889 | * Delete from old mount point vnode list, if on one. | |
890 | */ | |
891 | if (vp->v_mountb) { | |
892 | if (vq = vp->v_mountf) | |
893 | vq->v_mountb = vp->v_mountb; | |
894 | *vp->v_mountb = vq; | |
895 | vp->v_mountf = NULL; | |
896 | vp->v_mountb = NULL; | |
d10e9258 | 897 | vp->v_mount = NULL; |
ef24f6dd KM |
898 | } |
899 | /* | |
900 | * If special device, remove it from special device alias list. | |
901 | */ | |
902 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
903 | if (*vp->v_hashchain == vp) { |
904 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 905 | } else { |
7f7b7d89 | 906 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 907 | if (vq->v_specnext != vp) |
ef24f6dd | 908 | continue; |
c0de8792 | 909 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
910 | break; |
911 | } | |
c0de8792 | 912 | if (vq == NULL) |
ef24f6dd KM |
913 | panic("missing bdev"); |
914 | } | |
c0de8792 | 915 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 916 | vx = NULL; |
7f7b7d89 | 917 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
918 | if (vq->v_rdev != vp->v_rdev || |
919 | vq->v_type != vp->v_type) | |
c0de8792 | 920 | continue; |
4d1ee2eb CT |
921 | if (vx) |
922 | break; | |
c0de8792 KM |
923 | vx = vq; |
924 | } | |
4d1ee2eb | 925 | if (vx == NULL) |
c0de8792 | 926 | panic("missing alias"); |
4d1ee2eb | 927 | if (vq == NULL) |
c0de8792 KM |
928 | vx->v_flag &= ~VALIASED; |
929 | vp->v_flag &= ~VALIASED; | |
930 | } | |
931 | FREE(vp->v_specinfo, M_VNODE); | |
932 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
933 | } |
934 | /* | |
935 | * If it is on the freelist, move it to the head of the list. | |
936 | */ | |
937 | if (vp->v_freeb) { | |
938 | if (vq = vp->v_freef) | |
939 | vq->v_freeb = vp->v_freeb; | |
940 | else | |
941 | vfreet = vp->v_freeb; | |
942 | *vp->v_freeb = vq; | |
943 | vp->v_freef = vfreeh; | |
944 | vp->v_freeb = &vfreeh; | |
945 | vfreeh->v_freeb = &vp->v_freef; | |
946 | vfreeh = vp; | |
947 | } | |
2bae1875 | 948 | vp->v_type = VBAD; |
36d09cb1 | 949 | } |
ef62830d | 950 | |
2bcd6066 KM |
951 | /* |
952 | * Lookup a vnode by device number. | |
953 | */ | |
954 | vfinddev(dev, type, vpp) | |
955 | dev_t dev; | |
956 | enum vtype type; | |
957 | struct vnode **vpp; | |
958 | { | |
959 | register struct vnode *vp; | |
960 | ||
961 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
962 | if (dev != vp->v_rdev || type != vp->v_type) | |
963 | continue; | |
964 | *vpp = vp; | |
965 | return (0); | |
966 | } | |
967 | return (1); | |
968 | } | |
969 | ||
ef62830d KM |
970 | /* |
971 | * Calculate the total number of references to a special device. | |
972 | */ | |
973 | vcount(vp) | |
974 | register struct vnode *vp; | |
975 | { | |
7f7b7d89 | 976 | register struct vnode *vq; |
ef62830d KM |
977 | int count; |
978 | ||
979 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 980 | return (vp->v_usecount); |
ef62830d | 981 | loop: |
7f7b7d89 | 982 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 983 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
984 | continue; |
985 | /* | |
986 | * Alias, but not in use, so flush it out. | |
987 | */ | |
7f7b7d89 | 988 | if (vq->v_usecount == 0) { |
ef62830d KM |
989 | vgone(vq); |
990 | goto loop; | |
991 | } | |
7f7b7d89 | 992 | count += vq->v_usecount; |
ef62830d KM |
993 | } |
994 | return (count); | |
995 | } | |
0bf84b18 KM |
996 | |
997 | /* | |
998 | * Print out a description of a vnode. | |
999 | */ | |
1000 | static char *typename[] = | |
61f846a8 | 1001 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1002 | |
1003 | vprint(label, vp) | |
1004 | char *label; | |
1005 | register struct vnode *vp; | |
1006 | { | |
f2f730c6 | 1007 | char buf[64]; |
0bf84b18 KM |
1008 | |
1009 | if (label != NULL) | |
1010 | printf("%s: ", label); | |
65c3b3a8 KM |
1011 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1012 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1013 | vp->v_holdcnt); | |
f2f730c6 KM |
1014 | buf[0] = '\0'; |
1015 | if (vp->v_flag & VROOT) | |
1016 | strcat(buf, "|VROOT"); | |
1017 | if (vp->v_flag & VTEXT) | |
1018 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1019 | if (vp->v_flag & VSYSTEM) |
1020 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1021 | if (vp->v_flag & VXLOCK) |
1022 | strcat(buf, "|VXLOCK"); | |
1023 | if (vp->v_flag & VXWANT) | |
1024 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1025 | if (vp->v_flag & VBWAIT) |
1026 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1027 | if (vp->v_flag & VALIASED) |
1028 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1029 | if (buf[0] != '\0') |
1030 | printf(" flags (%s)", &buf[1]); | |
1031 | printf("\n\t"); | |
0bf84b18 KM |
1032 | VOP_PRINT(vp); |
1033 | } | |
985cbdd5 | 1034 | |
34c62e18 KM |
1035 | #ifdef DEBUG |
1036 | /* | |
1037 | * List all of the locked vnodes in the system. | |
1038 | * Called when debugging the kernel. | |
1039 | */ | |
1040 | printlockedvnodes() | |
1041 | { | |
1042 | register struct mount *mp; | |
1043 | register struct vnode *vp; | |
1044 | ||
1045 | printf("Locked vnodes\n"); | |
1046 | mp = rootfs; | |
1047 | do { | |
1048 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1049 | if (VOP_ISLOCKED(vp)) | |
1050 | vprint((char *)0, vp); | |
1051 | mp = mp->mnt_next; | |
1052 | } while (mp != rootfs); | |
1053 | } | |
1054 | #endif | |
1055 | ||
985cbdd5 MT |
1056 | int kinfo_vdebug = 1; |
1057 | int kinfo_vgetfailed; | |
1058 | #define KINFO_VNODESLOP 10 | |
1059 | /* | |
1060 | * Dump vnode list (via kinfo). | |
1061 | * Copyout address of vnode followed by vnode. | |
1062 | */ | |
aacc1bff | 1063 | /* ARGSUSED */ |
985cbdd5 | 1064 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1065 | int op; |
985cbdd5 | 1066 | char *where; |
aacc1bff | 1067 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1068 | { |
1069 | register struct mount *mp = rootfs; | |
36ef03ec | 1070 | struct mount *omp; |
985cbdd5 | 1071 | struct vnode *vp; |
985cbdd5 | 1072 | register char *bp = where, *savebp; |
5bf57294 | 1073 | char *ewhere; |
985cbdd5 MT |
1074 | int error; |
1075 | ||
1076 | #define VPTRSZ sizeof (struct vnode *) | |
1077 | #define VNODESZ sizeof (struct vnode) | |
1078 | if (where == NULL) { | |
1079 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1080 | return (0); | |
1081 | } | |
5bf57294 | 1082 | ewhere = where + *acopysize; |
985cbdd5 | 1083 | |
985cbdd5 | 1084 | do { |
36ef03ec | 1085 | if (vfs_busy(mp)) { |
54fb9dc2 | 1086 | mp = mp->mnt_next; |
36ef03ec KM |
1087 | continue; |
1088 | } | |
985cbdd5 MT |
1089 | savebp = bp; |
1090 | again: | |
4597dd33 | 1091 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1092 | /* |
1093 | * Check that the vp is still associated with | |
1094 | * this filesystem. RACE: could have been | |
1095 | * recycled onto the same filesystem. | |
1096 | */ | |
4597dd33 KM |
1097 | if (vp->v_mount != mp) { |
1098 | if (kinfo_vdebug) | |
1099 | printf("kinfo: vp changed\n"); | |
1100 | bp = savebp; | |
1101 | goto again; | |
1102 | } | |
985cbdd5 MT |
1103 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1104 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1105 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1106 | VNODESZ)))) |
985cbdd5 | 1107 | return (error); |
985cbdd5 | 1108 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1109 | } |
36ef03ec | 1110 | omp = mp; |
54fb9dc2 | 1111 | mp = mp->mnt_next; |
36ef03ec | 1112 | vfs_unbusy(omp); |
985cbdd5 MT |
1113 | } while (mp != rootfs); |
1114 | ||
1115 | *aneeded = bp - where; | |
1116 | if (bp > ewhere) | |
1117 | *acopysize = ewhere - where; | |
1118 | else | |
1119 | *acopysize = bp - where; | |
1120 | return (0); | |
1121 | } |