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 | * |
4a6391bf | 7 | * @(#)vfs_subr.c 7.82 (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/specdev.h> |
22 | #include <sys/namei.h> | |
23 | #include <sys/ucred.h> | |
24 | #include <sys/buf.h> | |
25 | #include <sys/errno.h> | |
26 | #include <sys/malloc.h> | |
3c4390e8 | 27 | |
807cc430 KM |
28 | enum vtype iftovt_tab[16] = { |
29 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
30 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
31 | }; | |
32 | int vttoif_tab[9] = { | |
33 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
34 | S_IFSOCK, S_IFIFO, S_IFMT, | |
35 | }; | |
36 | ||
3c4390e8 KM |
37 | /* |
38 | * Remove a mount point from the list of mounted filesystems. | |
39 | * Unmount of the root is illegal. | |
40 | */ | |
41 | void | |
42 | vfs_remove(mp) | |
43 | register struct mount *mp; | |
44 | { | |
45 | ||
46 | if (mp == rootfs) | |
47 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
48 | mp->mnt_prev->mnt_next = mp->mnt_next; |
49 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
50 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
51 | vfs_unlock(mp); |
52 | } | |
53 | ||
54 | /* | |
55 | * Lock a filesystem. | |
56 | * Used to prevent access to it while mounting and unmounting. | |
57 | */ | |
58 | vfs_lock(mp) | |
59 | register struct mount *mp; | |
60 | { | |
61 | ||
54fb9dc2 KM |
62 | while(mp->mnt_flag & MNT_MLOCK) { |
63 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
64 | sleep((caddr_t)mp, PVFS); |
65 | } | |
54fb9dc2 | 66 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
67 | return (0); |
68 | } | |
69 | ||
70 | /* | |
71 | * Unlock a locked filesystem. | |
72 | * Panic if filesystem is not locked. | |
73 | */ | |
74 | void | |
75 | vfs_unlock(mp) | |
76 | register struct mount *mp; | |
77 | { | |
78 | ||
54fb9dc2 | 79 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 80 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
81 | mp->mnt_flag &= ~MNT_MLOCK; |
82 | if (mp->mnt_flag & MNT_MWAIT) { | |
83 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
84 | wakeup((caddr_t)mp); |
85 | } | |
86 | } | |
87 | ||
36ef03ec KM |
88 | /* |
89 | * Mark a mount point as busy. | |
90 | * Used to synchronize access and to delay unmounting. | |
91 | */ | |
92 | vfs_busy(mp) | |
93 | register struct mount *mp; | |
94 | { | |
95 | ||
54fb9dc2 KM |
96 | while(mp->mnt_flag & MNT_MPBUSY) { |
97 | mp->mnt_flag |= MNT_MPWANT; | |
98 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 99 | } |
d8b63609 KM |
100 | if (mp->mnt_flag & MNT_UNMOUNT) |
101 | return (1); | |
54fb9dc2 | 102 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
103 | return (0); |
104 | } | |
105 | ||
106 | /* | |
107 | * Free a busy filesystem. | |
108 | * Panic if filesystem is not busy. | |
109 | */ | |
36ef03ec KM |
110 | vfs_unbusy(mp) |
111 | register struct mount *mp; | |
112 | { | |
113 | ||
54fb9dc2 | 114 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 115 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
116 | mp->mnt_flag &= ~MNT_MPBUSY; |
117 | if (mp->mnt_flag & MNT_MPWANT) { | |
118 | mp->mnt_flag &= ~MNT_MPWANT; | |
119 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
120 | } |
121 | } | |
122 | ||
3c4390e8 KM |
123 | /* |
124 | * Lookup a mount point by filesystem identifier. | |
125 | */ | |
126 | struct mount * | |
127 | getvfs(fsid) | |
128 | fsid_t *fsid; | |
129 | { | |
130 | register struct mount *mp; | |
131 | ||
d713f801 KM |
132 | mp = rootfs; |
133 | do { | |
54fb9dc2 KM |
134 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
135 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 136 | return (mp); |
3c4390e8 | 137 | } |
54fb9dc2 | 138 | mp = mp->mnt_next; |
d713f801 KM |
139 | } while (mp != rootfs); |
140 | return ((struct mount *)0); | |
3c4390e8 KM |
141 | } |
142 | ||
917dc539 JSP |
143 | /* |
144 | * Get a new unique fsid | |
145 | */ | |
146 | void | |
147 | getnewfsid(mp, mtype) | |
148 | struct mount *mp; | |
149 | int mtype; | |
150 | { | |
151 | static u_short xxxfs_mntid; | |
152 | ||
153 | fsid_t tfsid; | |
154 | ||
155 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */ | |
156 | mp->mnt_stat.f_fsid.val[1] = mtype; | |
157 | if (xxxfs_mntid == 0) | |
158 | ++xxxfs_mntid; | |
159 | tfsid.val[0] = makedev(nblkdev, xxxfs_mntid); | |
160 | tfsid.val[1] = mtype; | |
17fd1cc7 JSP |
161 | if (rootfs) { |
162 | while (getvfs(&tfsid)) { | |
163 | tfsid.val[0]++; | |
164 | xxxfs_mntid++; | |
165 | } | |
917dc539 JSP |
166 | } |
167 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
168 | } | |
169 | ||
3c4390e8 KM |
170 | /* |
171 | * Set vnode attributes to VNOVAL | |
172 | */ | |
173 | void vattr_null(vap) | |
174 | register struct vattr *vap; | |
175 | { | |
176 | ||
177 | vap->va_type = VNON; | |
83504fd5 | 178 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 179 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
180 | vap->va_fsid = vap->va_fileid = |
181 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
182 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
183 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
184 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 185 | vap->va_flags = vap->va_gen = VNOVAL; |
3c4390e8 | 186 | } |
c60798ca | 187 | |
36d09cb1 KM |
188 | /* |
189 | * Routines having to do with the management of the vnode table. | |
190 | */ | |
e781da98 | 191 | extern struct vnode *vfreeh, **vfreet; |
9342689a JH |
192 | extern int (**dead_vnodeop_p)(); |
193 | extern int (**spec_vnodeop_p)(); | |
32339c94 | 194 | extern void vclean(); |
1a80f56e | 195 | long numvnodes; |
e781da98 | 196 | extern struct vattr va_null; |
36d09cb1 KM |
197 | |
198 | /* | |
199 | * Return the next vnode from the free list. | |
200 | */ | |
201 | getnewvnode(tag, mp, vops, vpp) | |
202 | enum vtagtype tag; | |
203 | struct mount *mp; | |
cf74dd57 | 204 | int (**vops)(); |
36d09cb1 KM |
205 | struct vnode **vpp; |
206 | { | |
207 | register struct vnode *vp, *vq; | |
208 | ||
ecf75a7d KM |
209 | if ((vfreeh == NULL && numvnodes < 2 * desiredvnodes) || |
210 | numvnodes < desiredvnodes) { | |
aacc1bff KM |
211 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
212 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
213 | bzero((char *)vp, sizeof *vp); |
214 | numvnodes++; | |
215 | } else { | |
216 | if ((vp = vfreeh) == NULL) { | |
217 | tablefull("vnode"); | |
218 | *vpp = 0; | |
219 | return (ENFILE); | |
220 | } | |
221 | if (vp->v_usecount) | |
222 | panic("free vnode isn't"); | |
223 | if (vq = vp->v_freef) | |
224 | vq->v_freeb = &vfreeh; | |
225 | else | |
226 | vfreet = &vfreeh; | |
227 | vfreeh = vq; | |
228 | vp->v_freef = NULL; | |
229 | vp->v_freeb = NULL; | |
39b99eb6 | 230 | vp->v_lease = NULL; |
1a80f56e KM |
231 | if (vp->v_type != VBAD) |
232 | vgone(vp); | |
2345b093 KM |
233 | if (vp->v_data) |
234 | panic("cleaned vnode isn't"); | |
1a80f56e | 235 | vp->v_flag = 0; |
1a80f56e KM |
236 | vp->v_lastr = 0; |
237 | vp->v_socket = 0; | |
36d09cb1 | 238 | } |
b027498b | 239 | vp->v_type = VNON; |
36d09cb1 KM |
240 | cache_purge(vp); |
241 | vp->v_tag = tag; | |
ef24f6dd | 242 | vp->v_op = vops; |
36d09cb1 KM |
243 | insmntque(vp, mp); |
244 | VREF(vp); | |
245 | *vpp = vp; | |
246 | return (0); | |
247 | } | |
248 | ||
249 | /* | |
250 | * Move a vnode from one mount queue to another. | |
251 | */ | |
252 | insmntque(vp, mp) | |
253 | register struct vnode *vp; | |
254 | register struct mount *mp; | |
255 | { | |
8136adfc | 256 | register struct vnode *vq; |
36d09cb1 KM |
257 | |
258 | /* | |
259 | * Delete from old mount point vnode list, if on one. | |
260 | */ | |
261 | if (vp->v_mountb) { | |
262 | if (vq = vp->v_mountf) | |
263 | vq->v_mountb = vp->v_mountb; | |
264 | *vp->v_mountb = vq; | |
265 | } | |
266 | /* | |
267 | * Insert into list of vnodes for the new mount point, if available. | |
268 | */ | |
a45ff315 | 269 | vp->v_mount = mp; |
36d09cb1 KM |
270 | if (mp == NULL) { |
271 | vp->v_mountf = NULL; | |
272 | vp->v_mountb = NULL; | |
273 | return; | |
274 | } | |
8136adfc KM |
275 | if (vq = mp->mnt_mounth) |
276 | vq->v_mountb = &vp->v_mountf; | |
277 | vp->v_mountf = vq; | |
278 | vp->v_mountb = &mp->mnt_mounth; | |
279 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
280 | } |
281 | ||
76429560 KM |
282 | /* |
283 | * Update outstanding I/O count and do wakeup if requested. | |
284 | */ | |
285 | vwakeup(bp) | |
286 | register struct buf *bp; | |
287 | { | |
288 | register struct vnode *vp; | |
289 | ||
290 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
291 | if (vp = bp->b_vp) { | |
292 | vp->v_numoutput--; | |
293 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
294 | if (vp->v_numoutput < 0) | |
295 | panic("vwakeup: neg numoutput"); | |
296 | vp->v_flag &= ~VBWAIT; | |
297 | wakeup((caddr_t)&vp->v_numoutput); | |
298 | } | |
299 | } | |
300 | } | |
301 | ||
76429560 KM |
302 | /* |
303 | * Flush out and invalidate all buffers associated with a vnode. | |
304 | * Called with the underlying object locked. | |
305 | */ | |
d024c2ce KM |
306 | int |
307 | vinvalbuf(vp, save, cred, p) | |
76429560 KM |
308 | register struct vnode *vp; |
309 | int save; | |
d024c2ce KM |
310 | struct ucred *cred; |
311 | struct proc *p; | |
76429560 KM |
312 | { |
313 | register struct buf *bp; | |
314 | struct buf *nbp, *blist; | |
d024c2ce | 315 | int s, error; |
76429560 | 316 | |
d024c2ce KM |
317 | if (save) { |
318 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) | |
319 | return (error); | |
320 | if (vp->v_dirtyblkhd != NULL) | |
321 | panic("vinvalbuf: dirty bufs"); | |
322 | } | |
76429560 | 323 | for (;;) { |
d024c2ce | 324 | if (blist = vp->v_cleanblkhd) |
76429560 | 325 | /* void */; |
d024c2ce | 326 | else if (blist = vp->v_dirtyblkhd) |
76429560 KM |
327 | /* void */; |
328 | else | |
329 | break; | |
330 | for (bp = blist; bp; bp = nbp) { | |
331 | nbp = bp->b_blockf; | |
332 | s = splbio(); | |
333 | if (bp->b_flags & B_BUSY) { | |
334 | bp->b_flags |= B_WANTED; | |
335 | sleep((caddr_t)bp, PRIBIO + 1); | |
336 | splx(s); | |
337 | break; | |
338 | } | |
339 | bremfree(bp); | |
340 | bp->b_flags |= B_BUSY; | |
341 | splx(s); | |
76429560 KM |
342 | if (bp->b_vp != vp) |
343 | reassignbuf(bp, bp->b_vp); | |
344 | else | |
345 | bp->b_flags |= B_INVAL; | |
346 | brelse(bp); | |
347 | } | |
348 | } | |
349 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
350 | panic("vinvalbuf: flush failed"); | |
d024c2ce | 351 | return (0); |
76429560 KM |
352 | } |
353 | ||
354 | /* | |
355 | * Associate a buffer with a vnode. | |
356 | */ | |
357 | bgetvp(vp, bp) | |
358 | register struct vnode *vp; | |
359 | register struct buf *bp; | |
360 | { | |
8136adfc KM |
361 | register struct vnode *vq; |
362 | register struct buf *bq; | |
76429560 KM |
363 | |
364 | if (bp->b_vp) | |
365 | panic("bgetvp: not free"); | |
366 | VHOLD(vp); | |
367 | bp->b_vp = vp; | |
368 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
369 | bp->b_dev = vp->v_rdev; | |
370 | else | |
371 | bp->b_dev = NODEV; | |
372 | /* | |
373 | * Insert onto list for new vnode. | |
374 | */ | |
8136adfc KM |
375 | if (bq = vp->v_cleanblkhd) |
376 | bq->b_blockb = &bp->b_blockf; | |
377 | bp->b_blockf = bq; | |
378 | bp->b_blockb = &vp->v_cleanblkhd; | |
379 | vp->v_cleanblkhd = bp; | |
76429560 KM |
380 | } |
381 | ||
382 | /* | |
383 | * Disassociate a buffer from a vnode. | |
384 | */ | |
385 | brelvp(bp) | |
386 | register struct buf *bp; | |
387 | { | |
388 | struct buf *bq; | |
389 | struct vnode *vp; | |
390 | ||
391 | if (bp->b_vp == (struct vnode *) 0) | |
392 | panic("brelvp: NULL"); | |
393 | /* | |
394 | * Delete from old vnode list, if on one. | |
395 | */ | |
396 | if (bp->b_blockb) { | |
397 | if (bq = bp->b_blockf) | |
398 | bq->b_blockb = bp->b_blockb; | |
399 | *bp->b_blockb = bq; | |
400 | bp->b_blockf = NULL; | |
401 | bp->b_blockb = NULL; | |
402 | } | |
403 | vp = bp->b_vp; | |
404 | bp->b_vp = (struct vnode *) 0; | |
405 | HOLDRELE(vp); | |
406 | } | |
407 | ||
408 | /* | |
409 | * Reassign a buffer from one vnode to another. | |
410 | * Used to assign file specific control information | |
411 | * (indirect blocks) to the vnode to which they belong. | |
412 | */ | |
413 | reassignbuf(bp, newvp) | |
414 | register struct buf *bp; | |
415 | register struct vnode *newvp; | |
416 | { | |
417 | register struct buf *bq, **listheadp; | |
418 | ||
e5c3f16e KM |
419 | if (newvp == NULL) { |
420 | printf("reassignbuf: NULL"); | |
421 | return; | |
422 | } | |
76429560 KM |
423 | /* |
424 | * Delete from old vnode list, if on one. | |
425 | */ | |
426 | if (bp->b_blockb) { | |
427 | if (bq = bp->b_blockf) | |
428 | bq->b_blockb = bp->b_blockb; | |
429 | *bp->b_blockb = bq; | |
430 | } | |
431 | /* | |
432 | * If dirty, put on list of dirty buffers; | |
433 | * otherwise insert onto list of clean buffers. | |
434 | */ | |
435 | if (bp->b_flags & B_DELWRI) | |
436 | listheadp = &newvp->v_dirtyblkhd; | |
437 | else | |
438 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
439 | if (bq = *listheadp) |
440 | bq->b_blockb = &bp->b_blockf; | |
441 | bp->b_blockf = bq; | |
442 | bp->b_blockb = listheadp; | |
443 | *listheadp = bp; | |
76429560 KM |
444 | } |
445 | ||
36d09cb1 | 446 | /* |
ef24f6dd KM |
447 | * Create a vnode for a block device. |
448 | * Used for root filesystem, argdev, and swap areas. | |
449 | * Also used for memory file system special devices. | |
450 | */ | |
451 | bdevvp(dev, vpp) | |
452 | dev_t dev; | |
453 | struct vnode **vpp; | |
454 | { | |
ef24f6dd KM |
455 | register struct vnode *vp; |
456 | struct vnode *nvp; | |
457 | int error; | |
458 | ||
1c89915d KM |
459 | if (dev == NODEV) |
460 | return (0); | |
9342689a | 461 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
462 | if (error) { |
463 | *vpp = 0; | |
464 | return (error); | |
465 | } | |
466 | vp = nvp; | |
467 | vp->v_type = VBLK; | |
c0de8792 | 468 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
469 | vput(vp); |
470 | vp = nvp; | |
471 | } | |
472 | *vpp = vp; | |
473 | return (0); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Check to see if the new vnode represents a special device | |
478 | * for which we already have a vnode (either because of | |
479 | * bdevvp() or because of a different vnode representing | |
480 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 481 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
482 | * caller is responsible for filling it with its new contents. |
483 | */ | |
484 | struct vnode * | |
c0de8792 | 485 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 486 | register struct vnode *nvp; |
c0de8792 | 487 | dev_t nvp_rdev; |
ef24f6dd KM |
488 | struct mount *mp; |
489 | { | |
490 | register struct vnode *vp; | |
c0de8792 | 491 | struct vnode **vpp; |
ef24f6dd KM |
492 | |
493 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 494 | return (NULLVP); |
c0de8792 KM |
495 | |
496 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 497 | loop: |
c0de8792 KM |
498 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
499 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 500 | continue; |
c0de8792 KM |
501 | /* |
502 | * Alias, but not in use, so flush it out. | |
503 | */ | |
7f7b7d89 | 504 | if (vp->v_usecount == 0) { |
c0de8792 KM |
505 | vgone(vp); |
506 | goto loop; | |
507 | } | |
ef62830d KM |
508 | if (vget(vp)) |
509 | goto loop; | |
ef24f6dd KM |
510 | break; |
511 | } | |
c0de8792 | 512 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
513 | MALLOC(nvp->v_specinfo, struct specinfo *, |
514 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
515 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 516 | nvp->v_hashchain = vpp; |
c0de8792 | 517 | nvp->v_specnext = *vpp; |
2c957a90 | 518 | nvp->v_specflags = 0; |
c0de8792 | 519 | *vpp = nvp; |
40452d5e KM |
520 | if (vp != NULL) { |
521 | nvp->v_flag |= VALIASED; | |
522 | vp->v_flag |= VALIASED; | |
523 | vput(vp); | |
524 | } | |
54fb9dc2 | 525 | return (NULLVP); |
ef24f6dd | 526 | } |
2bae1875 KM |
527 | VOP_UNLOCK(vp); |
528 | vclean(vp, 0); | |
ef24f6dd KM |
529 | vp->v_op = nvp->v_op; |
530 | vp->v_tag = nvp->v_tag; | |
531 | nvp->v_type = VNON; | |
532 | insmntque(vp, mp); | |
533 | return (vp); | |
534 | } | |
535 | ||
536 | /* | |
537 | * Grab a particular vnode from the free list, increment its | |
538 | * reference count and lock it. The vnode lock bit is set the | |
539 | * vnode is being eliminated in vgone. The process is awakened | |
540 | * when the transition is completed, and an error returned to | |
541 | * indicate that the vnode is no longer usable (possibly having | |
542 | * been changed to a new file system type). | |
36d09cb1 KM |
543 | */ |
544 | vget(vp) | |
545 | register struct vnode *vp; | |
546 | { | |
547 | register struct vnode *vq; | |
548 | ||
ef24f6dd KM |
549 | if (vp->v_flag & VXLOCK) { |
550 | vp->v_flag |= VXWANT; | |
551 | sleep((caddr_t)vp, PINOD); | |
552 | return (1); | |
553 | } | |
7f7b7d89 | 554 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
555 | if (vq = vp->v_freef) |
556 | vq->v_freeb = vp->v_freeb; | |
557 | else | |
558 | vfreet = vp->v_freeb; | |
559 | *vp->v_freeb = vq; | |
560 | vp->v_freef = NULL; | |
561 | vp->v_freeb = NULL; | |
562 | } | |
36d09cb1 | 563 | VREF(vp); |
ef24f6dd KM |
564 | VOP_LOCK(vp); |
565 | return (0); | |
36d09cb1 KM |
566 | } |
567 | ||
d32390ea KM |
568 | int bug_refs = 0; |
569 | ||
36d09cb1 KM |
570 | /* |
571 | * Vnode reference, just increment the count | |
572 | */ | |
573 | void vref(vp) | |
574 | struct vnode *vp; | |
575 | { | |
576 | ||
7f7b7d89 | 577 | vp->v_usecount++; |
d32390ea KM |
578 | if (vp->v_type != VBLK && curproc) |
579 | curproc->p_spare[0]++; | |
580 | if (bug_refs) | |
581 | vprint("vref: "); | |
36d09cb1 KM |
582 | } |
583 | ||
584 | /* | |
585 | * vput(), just unlock and vrele() | |
586 | */ | |
587 | void vput(vp) | |
588 | register struct vnode *vp; | |
589 | { | |
4d1ee2eb | 590 | |
36d09cb1 KM |
591 | VOP_UNLOCK(vp); |
592 | vrele(vp); | |
593 | } | |
594 | ||
595 | /* | |
596 | * Vnode release. | |
597 | * If count drops to zero, call inactive routine and return to freelist. | |
598 | */ | |
599 | void vrele(vp) | |
600 | register struct vnode *vp; | |
601 | { | |
602 | ||
65c3b3a8 | 603 | #ifdef DIAGNOSTIC |
36d09cb1 | 604 | if (vp == NULL) |
ef24f6dd | 605 | panic("vrele: null vp"); |
65c3b3a8 | 606 | #endif |
7f7b7d89 | 607 | vp->v_usecount--; |
d32390ea KM |
608 | if (vp->v_type != VBLK && curproc) |
609 | curproc->p_spare[0]--; | |
610 | if (bug_refs) | |
611 | vprint("vref: "); | |
7f7b7d89 | 612 | if (vp->v_usecount > 0) |
36d09cb1 | 613 | return; |
65c3b3a8 KM |
614 | #ifdef DIAGNOSTIC |
615 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
616 | vprint("vrele: bad ref count", vp); | |
617 | panic("vrele: ref cnt"); | |
618 | } | |
619 | #endif | |
54fb9dc2 | 620 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
621 | /* |
622 | * insert into empty list | |
623 | */ | |
624 | vfreeh = vp; | |
625 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
626 | } else { |
627 | /* | |
628 | * insert at tail of list | |
629 | */ | |
630 | *vfreet = vp; | |
631 | vp->v_freeb = vfreet; | |
36d09cb1 | 632 | } |
ef24f6dd KM |
633 | vp->v_freef = NULL; |
634 | vfreet = &vp->v_freef; | |
d024c2ce | 635 | VOP_INACTIVE(vp); |
ef24f6dd KM |
636 | } |
637 | ||
7f7b7d89 KM |
638 | /* |
639 | * Page or buffer structure gets a reference. | |
640 | */ | |
451df175 | 641 | void vhold(vp) |
7f7b7d89 KM |
642 | register struct vnode *vp; |
643 | { | |
644 | ||
645 | vp->v_holdcnt++; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Page or buffer structure frees a reference. | |
650 | */ | |
451df175 | 651 | void holdrele(vp) |
7f7b7d89 KM |
652 | register struct vnode *vp; |
653 | { | |
654 | ||
655 | if (vp->v_holdcnt <= 0) | |
656 | panic("holdrele: holdcnt"); | |
657 | vp->v_holdcnt--; | |
658 | } | |
659 | ||
f0556f86 KM |
660 | /* |
661 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
662 | * | |
663 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
664 | * return error if any are found (nb: this is a user error, not a | |
665 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
666 | * that are found. | |
667 | */ | |
668 | int busyprt = 0; /* patch to print out busy vnodes */ | |
669 | ||
670 | vflush(mp, skipvp, flags) | |
671 | struct mount *mp; | |
672 | struct vnode *skipvp; | |
673 | int flags; | |
674 | { | |
675 | register struct vnode *vp, *nvp; | |
676 | int busy = 0; | |
677 | ||
54fb9dc2 | 678 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 679 | panic("vflush: not busy"); |
4597dd33 | 680 | loop: |
54fb9dc2 | 681 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
682 | if (vp->v_mount != mp) |
683 | goto loop; | |
f0556f86 KM |
684 | nvp = vp->v_mountf; |
685 | /* | |
686 | * Skip over a selected vnode. | |
f0556f86 KM |
687 | */ |
688 | if (vp == skipvp) | |
689 | continue; | |
36ef03ec KM |
690 | /* |
691 | * Skip over a vnodes marked VSYSTEM. | |
692 | */ | |
693 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
694 | continue; | |
f0556f86 | 695 | /* |
7f7b7d89 | 696 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
697 | * out the vnode data structures and we are done. |
698 | */ | |
7f7b7d89 | 699 | if (vp->v_usecount == 0) { |
f0556f86 KM |
700 | vgone(vp); |
701 | continue; | |
702 | } | |
703 | /* | |
704 | * For block or character devices, revert to an | |
705 | * anonymous device. For all other files, just kill them. | |
706 | */ | |
36ef03ec | 707 | if (flags & FORCECLOSE) { |
f0556f86 KM |
708 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
709 | vgone(vp); | |
710 | } else { | |
711 | vclean(vp, 0); | |
9342689a | 712 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
713 | insmntque(vp, (struct mount *)0); |
714 | } | |
715 | continue; | |
716 | } | |
717 | if (busyprt) | |
0bf84b18 | 718 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
719 | busy++; |
720 | } | |
721 | if (busy) | |
722 | return (EBUSY); | |
723 | return (0); | |
724 | } | |
725 | ||
ef24f6dd KM |
726 | /* |
727 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 728 | */ |
ecf75a7d KM |
729 | void |
730 | vclean(vp, flags) | |
ef24f6dd | 731 | register struct vnode *vp; |
aacc1bff | 732 | int flags; |
ef24f6dd | 733 | { |
4a6391bf KM |
734 | struct vop_inactive_args vop_inactive_a; |
735 | struct vop_reclaim_args vop_reclaim_a; | |
736 | struct vop_unlock_args vop_unlock_a; | |
737 | struct vop_close_args vop_close_a; | |
38c46eee | 738 | int (**origops)(); |
2bae1875 | 739 | int active; |
ef24f6dd | 740 | |
2bae1875 KM |
741 | /* |
742 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
743 | * If so we have to reference it before we clean it out |
744 | * so that its count cannot fall to zero and generate a | |
745 | * race against ourselves to recycle it. | |
2bae1875 | 746 | */ |
7f7b7d89 | 747 | if (active = vp->v_usecount) |
2bae1875 | 748 | VREF(vp); |
2bae1875 KM |
749 | /* |
750 | * Prevent the vnode from being recycled or | |
751 | * brought into use while we clean it out. | |
752 | */ | |
0bf84b18 KM |
753 | if (vp->v_flag & VXLOCK) |
754 | panic("vclean: deadlock"); | |
ef24f6dd | 755 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
756 | /* |
757 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
758 | * have the object locked while it cleans it out. The VOP_LOCK | |
759 | * ensures that the VOP_INACTIVE routine is done with its work. | |
760 | * For active vnodes, it ensures that no other activity can | |
761 | * occur while the buffer list is being cleaned out. | |
762 | */ | |
763 | VOP_LOCK(vp); | |
36ef03ec | 764 | if (flags & DOCLOSE) |
d024c2ce | 765 | vinvalbuf(vp, 1, NOCRED, NULL); |
ef24f6dd KM |
766 | /* |
767 | * Prevent any further operations on the vnode from | |
768 | * being passed through to the old file system. | |
769 | */ | |
770 | origops = vp->v_op; | |
9342689a | 771 | vp->v_op = dead_vnodeop_p; |
ef24f6dd KM |
772 | vp->v_tag = VT_NON; |
773 | /* | |
2bae1875 KM |
774 | * If purging an active vnode, it must be unlocked, closed, |
775 | * and deactivated before being reclaimed. | |
ef24f6dd | 776 | */ |
38c46eee JH |
777 | vop_unlock_a.a_desc = VDESC(vop_unlock); |
778 | vop_unlock_a.a_vp = vp; | |
779 | VOCALL(origops,VOFFSET(vop_unlock),&vop_unlock_a); | |
2bae1875 | 780 | if (active) { |
38c46eee JH |
781 | /* |
782 | * Note: these next two calls imply | |
783 | * that vop_close and vop_inactive implementations | |
784 | * cannot count on the ops vector being correctly | |
785 | * set. | |
786 | */ | |
787 | if (flags & DOCLOSE) { | |
788 | vop_close_a.a_desc = VDESC(vop_close); | |
789 | vop_close_a.a_vp = vp; | |
790 | vop_close_a.a_fflag = IO_NDELAY; | |
d024c2ce | 791 | vop_close_a.a_p = NULL; |
38c46eee JH |
792 | VOCALL(origops,VOFFSET(vop_close),&vop_close_a); |
793 | }; | |
794 | vop_inactive_a.a_desc = VDESC(vop_inactive); | |
795 | vop_inactive_a.a_vp = vp; | |
38c46eee | 796 | VOCALL(origops,VOFFSET(vop_inactive),&vop_inactive_a); |
ef24f6dd KM |
797 | } |
798 | /* | |
799 | * Reclaim the vnode. | |
800 | */ | |
38c46eee JH |
801 | /* |
802 | * Emulate VOP_RECLAIM. | |
803 | */ | |
804 | vop_reclaim_a.a_desc = VDESC(vop_reclaim); | |
805 | vop_reclaim_a.a_vp = vp; | |
806 | if (VOCALL(origops,VOFFSET(vop_reclaim),&vop_reclaim_a)) | |
ef24f6dd | 807 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
808 | if (active) |
809 | vrele(vp); | |
38c46eee | 810 | |
ef24f6dd KM |
811 | /* |
812 | * Done with purge, notify sleepers in vget of the grim news. | |
813 | */ | |
814 | vp->v_flag &= ~VXLOCK; | |
815 | if (vp->v_flag & VXWANT) { | |
816 | vp->v_flag &= ~VXWANT; | |
817 | wakeup((caddr_t)vp); | |
818 | } | |
819 | } | |
820 | ||
ef62830d KM |
821 | /* |
822 | * Eliminate all activity associated with the requested vnode | |
823 | * and with all vnodes aliased to the requested vnode. | |
824 | */ | |
825 | void vgoneall(vp) | |
826 | register struct vnode *vp; | |
827 | { | |
7f7b7d89 | 828 | register struct vnode *vq; |
ef62830d | 829 | |
7a7b3a95 KM |
830 | if (vp->v_flag & VALIASED) { |
831 | /* | |
832 | * If a vgone (or vclean) is already in progress, | |
833 | * wait until it is done and return. | |
834 | */ | |
835 | if (vp->v_flag & VXLOCK) { | |
836 | vp->v_flag |= VXWANT; | |
837 | sleep((caddr_t)vp, PINOD); | |
838 | return; | |
839 | } | |
840 | /* | |
841 | * Ensure that vp will not be vgone'd while we | |
842 | * are eliminating its aliases. | |
843 | */ | |
844 | vp->v_flag |= VXLOCK; | |
845 | while (vp->v_flag & VALIASED) { | |
846 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
847 | if (vq->v_rdev != vp->v_rdev || | |
848 | vq->v_type != vp->v_type || vp == vq) | |
849 | continue; | |
850 | vgone(vq); | |
851 | break; | |
852 | } | |
ef62830d | 853 | } |
7a7b3a95 KM |
854 | /* |
855 | * Remove the lock so that vgone below will | |
856 | * really eliminate the vnode after which time | |
857 | * vgone will awaken any sleepers. | |
858 | */ | |
859 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
860 | } |
861 | vgone(vp); | |
862 | } | |
863 | ||
ef24f6dd KM |
864 | /* |
865 | * Eliminate all activity associated with a vnode | |
866 | * in preparation for reuse. | |
867 | */ | |
868 | void vgone(vp) | |
869 | register struct vnode *vp; | |
870 | { | |
7f7b7d89 | 871 | register struct vnode *vq; |
c0de8792 | 872 | struct vnode *vx; |
ef24f6dd | 873 | |
4f55e3ec KM |
874 | /* |
875 | * If a vgone (or vclean) is already in progress, | |
876 | * wait until it is done and return. | |
877 | */ | |
878 | if (vp->v_flag & VXLOCK) { | |
879 | vp->v_flag |= VXWANT; | |
880 | sleep((caddr_t)vp, PINOD); | |
881 | return; | |
882 | } | |
ef24f6dd KM |
883 | /* |
884 | * Clean out the filesystem specific data. | |
885 | */ | |
36ef03ec | 886 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
887 | /* |
888 | * Delete from old mount point vnode list, if on one. | |
889 | */ | |
890 | if (vp->v_mountb) { | |
891 | if (vq = vp->v_mountf) | |
892 | vq->v_mountb = vp->v_mountb; | |
893 | *vp->v_mountb = vq; | |
894 | vp->v_mountf = NULL; | |
895 | vp->v_mountb = NULL; | |
d10e9258 | 896 | vp->v_mount = NULL; |
ef24f6dd KM |
897 | } |
898 | /* | |
899 | * If special device, remove it from special device alias list. | |
900 | */ | |
901 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
902 | if (*vp->v_hashchain == vp) { |
903 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 904 | } else { |
7f7b7d89 | 905 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 906 | if (vq->v_specnext != vp) |
ef24f6dd | 907 | continue; |
c0de8792 | 908 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
909 | break; |
910 | } | |
c0de8792 | 911 | if (vq == NULL) |
ef24f6dd KM |
912 | panic("missing bdev"); |
913 | } | |
c0de8792 | 914 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 915 | vx = NULL; |
7f7b7d89 | 916 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
917 | if (vq->v_rdev != vp->v_rdev || |
918 | vq->v_type != vp->v_type) | |
c0de8792 | 919 | continue; |
4d1ee2eb CT |
920 | if (vx) |
921 | break; | |
c0de8792 KM |
922 | vx = vq; |
923 | } | |
4d1ee2eb | 924 | if (vx == NULL) |
c0de8792 | 925 | panic("missing alias"); |
4d1ee2eb | 926 | if (vq == NULL) |
c0de8792 KM |
927 | vx->v_flag &= ~VALIASED; |
928 | vp->v_flag &= ~VALIASED; | |
929 | } | |
930 | FREE(vp->v_specinfo, M_VNODE); | |
931 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
932 | } |
933 | /* | |
934 | * If it is on the freelist, move it to the head of the list. | |
935 | */ | |
936 | if (vp->v_freeb) { | |
937 | if (vq = vp->v_freef) | |
938 | vq->v_freeb = vp->v_freeb; | |
939 | else | |
940 | vfreet = vp->v_freeb; | |
941 | *vp->v_freeb = vq; | |
942 | vp->v_freef = vfreeh; | |
943 | vp->v_freeb = &vfreeh; | |
944 | vfreeh->v_freeb = &vp->v_freef; | |
945 | vfreeh = vp; | |
946 | } | |
2bae1875 | 947 | vp->v_type = VBAD; |
36d09cb1 | 948 | } |
ef62830d | 949 | |
2bcd6066 KM |
950 | /* |
951 | * Lookup a vnode by device number. | |
952 | */ | |
953 | vfinddev(dev, type, vpp) | |
954 | dev_t dev; | |
955 | enum vtype type; | |
956 | struct vnode **vpp; | |
957 | { | |
958 | register struct vnode *vp; | |
959 | ||
960 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
961 | if (dev != vp->v_rdev || type != vp->v_type) | |
962 | continue; | |
963 | *vpp = vp; | |
964 | return (0); | |
965 | } | |
966 | return (1); | |
967 | } | |
968 | ||
ef62830d KM |
969 | /* |
970 | * Calculate the total number of references to a special device. | |
971 | */ | |
972 | vcount(vp) | |
973 | register struct vnode *vp; | |
974 | { | |
7f7b7d89 | 975 | register struct vnode *vq; |
ef62830d KM |
976 | int count; |
977 | ||
978 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 979 | return (vp->v_usecount); |
ef62830d | 980 | loop: |
7f7b7d89 | 981 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 982 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
983 | continue; |
984 | /* | |
985 | * Alias, but not in use, so flush it out. | |
986 | */ | |
7f7b7d89 | 987 | if (vq->v_usecount == 0) { |
ef62830d KM |
988 | vgone(vq); |
989 | goto loop; | |
990 | } | |
7f7b7d89 | 991 | count += vq->v_usecount; |
ef62830d KM |
992 | } |
993 | return (count); | |
994 | } | |
0bf84b18 KM |
995 | |
996 | /* | |
997 | * Print out a description of a vnode. | |
998 | */ | |
999 | static char *typename[] = | |
61f846a8 | 1000 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1001 | |
1002 | vprint(label, vp) | |
1003 | char *label; | |
1004 | register struct vnode *vp; | |
1005 | { | |
f2f730c6 | 1006 | char buf[64]; |
0bf84b18 KM |
1007 | |
1008 | if (label != NULL) | |
1009 | printf("%s: ", label); | |
65c3b3a8 KM |
1010 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1011 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1012 | vp->v_holdcnt); | |
f2f730c6 KM |
1013 | buf[0] = '\0'; |
1014 | if (vp->v_flag & VROOT) | |
1015 | strcat(buf, "|VROOT"); | |
1016 | if (vp->v_flag & VTEXT) | |
1017 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1018 | if (vp->v_flag & VSYSTEM) |
1019 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1020 | if (vp->v_flag & VXLOCK) |
1021 | strcat(buf, "|VXLOCK"); | |
1022 | if (vp->v_flag & VXWANT) | |
1023 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1024 | if (vp->v_flag & VBWAIT) |
1025 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1026 | if (vp->v_flag & VALIASED) |
1027 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1028 | if (buf[0] != '\0') |
1029 | printf(" flags (%s)", &buf[1]); | |
1030 | printf("\n\t"); | |
0bf84b18 KM |
1031 | VOP_PRINT(vp); |
1032 | } | |
985cbdd5 | 1033 | |
34c62e18 KM |
1034 | #ifdef DEBUG |
1035 | /* | |
1036 | * List all of the locked vnodes in the system. | |
1037 | * Called when debugging the kernel. | |
1038 | */ | |
1039 | printlockedvnodes() | |
1040 | { | |
1041 | register struct mount *mp; | |
1042 | register struct vnode *vp; | |
1043 | ||
1044 | printf("Locked vnodes\n"); | |
1045 | mp = rootfs; | |
1046 | do { | |
1047 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1048 | if (VOP_ISLOCKED(vp)) | |
1049 | vprint((char *)0, vp); | |
1050 | mp = mp->mnt_next; | |
1051 | } while (mp != rootfs); | |
1052 | } | |
1053 | #endif | |
1054 | ||
985cbdd5 MT |
1055 | int kinfo_vdebug = 1; |
1056 | int kinfo_vgetfailed; | |
1057 | #define KINFO_VNODESLOP 10 | |
1058 | /* | |
1059 | * Dump vnode list (via kinfo). | |
1060 | * Copyout address of vnode followed by vnode. | |
1061 | */ | |
aacc1bff | 1062 | /* ARGSUSED */ |
985cbdd5 | 1063 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1064 | int op; |
985cbdd5 | 1065 | char *where; |
aacc1bff | 1066 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1067 | { |
1068 | register struct mount *mp = rootfs; | |
36ef03ec | 1069 | struct mount *omp; |
985cbdd5 | 1070 | struct vnode *vp; |
985cbdd5 | 1071 | register char *bp = where, *savebp; |
5bf57294 | 1072 | char *ewhere; |
985cbdd5 MT |
1073 | int error; |
1074 | ||
1075 | #define VPTRSZ sizeof (struct vnode *) | |
1076 | #define VNODESZ sizeof (struct vnode) | |
1077 | if (where == NULL) { | |
1078 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1079 | return (0); | |
1080 | } | |
5bf57294 | 1081 | ewhere = where + *acopysize; |
985cbdd5 | 1082 | |
985cbdd5 | 1083 | do { |
36ef03ec | 1084 | if (vfs_busy(mp)) { |
54fb9dc2 | 1085 | mp = mp->mnt_next; |
36ef03ec KM |
1086 | continue; |
1087 | } | |
985cbdd5 MT |
1088 | savebp = bp; |
1089 | again: | |
4597dd33 | 1090 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1091 | /* |
1092 | * Check that the vp is still associated with | |
1093 | * this filesystem. RACE: could have been | |
1094 | * recycled onto the same filesystem. | |
1095 | */ | |
4597dd33 KM |
1096 | if (vp->v_mount != mp) { |
1097 | if (kinfo_vdebug) | |
1098 | printf("kinfo: vp changed\n"); | |
1099 | bp = savebp; | |
1100 | goto again; | |
1101 | } | |
985cbdd5 MT |
1102 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1103 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1104 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1105 | VNODESZ)))) |
985cbdd5 | 1106 | return (error); |
985cbdd5 | 1107 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1108 | } |
36ef03ec | 1109 | omp = mp; |
54fb9dc2 | 1110 | mp = mp->mnt_next; |
36ef03ec | 1111 | vfs_unbusy(omp); |
985cbdd5 MT |
1112 | } while (mp != rootfs); |
1113 | ||
1114 | *aneeded = bp - where; | |
1115 | if (bp > ewhere) | |
1116 | *acopysize = ewhere - where; | |
1117 | else | |
1118 | *acopysize = bp - where; | |
1119 | return (0); | |
1120 | } |