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 | * |
2345b093 | 7 | * @(#)vfs_subr.c 7.64 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
cb796a23 KB |
14 | #include <sys/param.h> |
15 | #include <sys/proc.h> | |
16 | #include <sys/mount.h> | |
17 | #include <sys/time.h> | |
18 | #include <sys/vnode.h> | |
19 | #include <sys/specdev.h> | |
20 | #include <sys/namei.h> | |
21 | #include <sys/ucred.h> | |
22 | #include <sys/buf.h> | |
23 | #include <sys/errno.h> | |
24 | #include <sys/malloc.h> | |
3c4390e8 | 25 | |
3c4390e8 KM |
26 | /* |
27 | * Remove a mount point from the list of mounted filesystems. | |
28 | * Unmount of the root is illegal. | |
29 | */ | |
30 | void | |
31 | vfs_remove(mp) | |
32 | register struct mount *mp; | |
33 | { | |
34 | ||
35 | if (mp == rootfs) | |
36 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
37 | mp->mnt_prev->mnt_next = mp->mnt_next; |
38 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
39 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
40 | vfs_unlock(mp); |
41 | } | |
42 | ||
43 | /* | |
44 | * Lock a filesystem. | |
45 | * Used to prevent access to it while mounting and unmounting. | |
46 | */ | |
47 | vfs_lock(mp) | |
48 | register struct mount *mp; | |
49 | { | |
50 | ||
54fb9dc2 KM |
51 | while(mp->mnt_flag & MNT_MLOCK) { |
52 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
53 | sleep((caddr_t)mp, PVFS); |
54 | } | |
54fb9dc2 | 55 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
56 | return (0); |
57 | } | |
58 | ||
59 | /* | |
60 | * Unlock a locked filesystem. | |
61 | * Panic if filesystem is not locked. | |
62 | */ | |
63 | void | |
64 | vfs_unlock(mp) | |
65 | register struct mount *mp; | |
66 | { | |
67 | ||
54fb9dc2 | 68 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 69 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
70 | mp->mnt_flag &= ~MNT_MLOCK; |
71 | if (mp->mnt_flag & MNT_MWAIT) { | |
72 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
73 | wakeup((caddr_t)mp); |
74 | } | |
75 | } | |
76 | ||
36ef03ec KM |
77 | /* |
78 | * Mark a mount point as busy. | |
79 | * Used to synchronize access and to delay unmounting. | |
80 | */ | |
81 | vfs_busy(mp) | |
82 | register struct mount *mp; | |
83 | { | |
84 | ||
54fb9dc2 KM |
85 | while(mp->mnt_flag & MNT_MPBUSY) { |
86 | mp->mnt_flag |= MNT_MPWANT; | |
87 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 88 | } |
d8b63609 KM |
89 | if (mp->mnt_flag & MNT_UNMOUNT) |
90 | return (1); | |
54fb9dc2 | 91 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
92 | return (0); |
93 | } | |
94 | ||
95 | /* | |
96 | * Free a busy filesystem. | |
97 | * Panic if filesystem is not busy. | |
98 | */ | |
36ef03ec KM |
99 | vfs_unbusy(mp) |
100 | register struct mount *mp; | |
101 | { | |
102 | ||
54fb9dc2 | 103 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 104 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
105 | mp->mnt_flag &= ~MNT_MPBUSY; |
106 | if (mp->mnt_flag & MNT_MPWANT) { | |
107 | mp->mnt_flag &= ~MNT_MPWANT; | |
108 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
109 | } |
110 | } | |
111 | ||
3c4390e8 KM |
112 | /* |
113 | * Lookup a mount point by filesystem identifier. | |
114 | */ | |
115 | struct mount * | |
116 | getvfs(fsid) | |
117 | fsid_t *fsid; | |
118 | { | |
119 | register struct mount *mp; | |
120 | ||
d713f801 KM |
121 | mp = rootfs; |
122 | do { | |
54fb9dc2 KM |
123 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
124 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 125 | return (mp); |
3c4390e8 | 126 | } |
54fb9dc2 | 127 | mp = mp->mnt_next; |
d713f801 KM |
128 | } while (mp != rootfs); |
129 | return ((struct mount *)0); | |
3c4390e8 KM |
130 | } |
131 | ||
132 | /* | |
133 | * Set vnode attributes to VNOVAL | |
134 | */ | |
135 | void vattr_null(vap) | |
136 | register struct vattr *vap; | |
137 | { | |
138 | ||
139 | vap->va_type = VNON; | |
83504fd5 KM |
140 | vap->va_size = vap->va_bytes = VNOVAL; |
141 | #ifdef _NOQUAD | |
142 | vap->va_size_rsv = vap->va_bytes_rsv = VNOVAL; | |
143 | #endif | |
3c4390e8 | 144 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
145 | vap->va_fsid = vap->va_fileid = |
146 | vap->va_blocksize = vap->va_rdev = | |
3c4390e8 KM |
147 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
148 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
149 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
150 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 151 | } |
c60798ca | 152 | |
36d09cb1 KM |
153 | /* |
154 | * Routines having to do with the management of the vnode table. | |
155 | */ | |
156 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 157 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 158 | extern void vclean(); |
1a80f56e | 159 | long numvnodes; |
d3664d8f | 160 | struct vattr va_null; |
c0de8792 | 161 | |
36d09cb1 | 162 | /* |
ef24f6dd | 163 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 164 | */ |
ef24f6dd | 165 | vfsinit() |
36d09cb1 | 166 | { |
ef24f6dd | 167 | struct vfsops **vfsp; |
36d09cb1 | 168 | |
ef24f6dd KM |
169 | /* |
170 | * Initialize the vnode name cache | |
171 | */ | |
172 | nchinit(); | |
173 | /* | |
174 | * Initialize each file system type. | |
175 | */ | |
d3664d8f | 176 | vattr_null(&va_null); |
ef24f6dd KM |
177 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
178 | if (*vfsp == NULL) | |
179 | continue; | |
180 | (*(*vfsp)->vfs_init)(); | |
181 | } | |
36d09cb1 KM |
182 | } |
183 | ||
184 | /* | |
185 | * Return the next vnode from the free list. | |
186 | */ | |
187 | getnewvnode(tag, mp, vops, vpp) | |
188 | enum vtagtype tag; | |
189 | struct mount *mp; | |
190 | struct vnodeops *vops; | |
191 | struct vnode **vpp; | |
192 | { | |
193 | register struct vnode *vp, *vq; | |
194 | ||
1a80f56e | 195 | if (numvnodes < desiredvnodes) { |
aacc1bff KM |
196 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
197 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
198 | bzero((char *)vp, sizeof *vp); |
199 | numvnodes++; | |
200 | } else { | |
201 | if ((vp = vfreeh) == NULL) { | |
202 | tablefull("vnode"); | |
203 | *vpp = 0; | |
204 | return (ENFILE); | |
205 | } | |
206 | if (vp->v_usecount) | |
207 | panic("free vnode isn't"); | |
208 | if (vq = vp->v_freef) | |
209 | vq->v_freeb = &vfreeh; | |
210 | else | |
211 | vfreet = &vfreeh; | |
212 | vfreeh = vq; | |
213 | vp->v_freef = NULL; | |
214 | vp->v_freeb = NULL; | |
215 | if (vp->v_type != VBAD) | |
216 | vgone(vp); | |
2345b093 KM |
217 | if (vp->v_data) |
218 | panic("cleaned vnode isn't"); | |
1a80f56e | 219 | vp->v_flag = 0; |
1a80f56e KM |
220 | vp->v_lastr = 0; |
221 | vp->v_socket = 0; | |
36d09cb1 | 222 | } |
b027498b | 223 | vp->v_type = VNON; |
36d09cb1 KM |
224 | cache_purge(vp); |
225 | vp->v_tag = tag; | |
ef24f6dd | 226 | vp->v_op = vops; |
36d09cb1 KM |
227 | insmntque(vp, mp); |
228 | VREF(vp); | |
229 | *vpp = vp; | |
230 | return (0); | |
231 | } | |
232 | ||
233 | /* | |
234 | * Move a vnode from one mount queue to another. | |
235 | */ | |
236 | insmntque(vp, mp) | |
237 | register struct vnode *vp; | |
238 | register struct mount *mp; | |
239 | { | |
8136adfc | 240 | register struct vnode *vq; |
36d09cb1 KM |
241 | |
242 | /* | |
243 | * Delete from old mount point vnode list, if on one. | |
244 | */ | |
245 | if (vp->v_mountb) { | |
246 | if (vq = vp->v_mountf) | |
247 | vq->v_mountb = vp->v_mountb; | |
248 | *vp->v_mountb = vq; | |
249 | } | |
250 | /* | |
251 | * Insert into list of vnodes for the new mount point, if available. | |
252 | */ | |
a45ff315 | 253 | vp->v_mount = mp; |
36d09cb1 KM |
254 | if (mp == NULL) { |
255 | vp->v_mountf = NULL; | |
256 | vp->v_mountb = NULL; | |
257 | return; | |
258 | } | |
8136adfc KM |
259 | if (vq = mp->mnt_mounth) |
260 | vq->v_mountb = &vp->v_mountf; | |
261 | vp->v_mountf = vq; | |
262 | vp->v_mountb = &mp->mnt_mounth; | |
263 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
264 | } |
265 | ||
76429560 KM |
266 | /* |
267 | * Make sure all write-behind blocks associated | |
268 | * with mount point are flushed out (from sync). | |
269 | */ | |
270 | mntflushbuf(mountp, flags) | |
271 | struct mount *mountp; | |
272 | int flags; | |
273 | { | |
274 | register struct vnode *vp; | |
275 | ||
276 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
277 | panic("mntflushbuf: not busy"); | |
278 | loop: | |
279 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
280 | if (VOP_ISLOCKED(vp)) | |
281 | continue; | |
282 | if (vget(vp)) | |
283 | goto loop; | |
284 | vflushbuf(vp, flags); | |
285 | vput(vp); | |
286 | if (vp->v_mount != mountp) | |
287 | goto loop; | |
288 | } | |
289 | } | |
290 | ||
291 | /* | |
292 | * Flush all dirty buffers associated with a vnode. | |
293 | */ | |
294 | vflushbuf(vp, flags) | |
295 | register struct vnode *vp; | |
296 | int flags; | |
297 | { | |
298 | register struct buf *bp; | |
299 | struct buf *nbp; | |
300 | int s; | |
301 | ||
302 | loop: | |
303 | s = splbio(); | |
304 | for (bp = vp->v_dirtyblkhd; bp; bp = nbp) { | |
305 | nbp = bp->b_blockf; | |
306 | if ((bp->b_flags & B_BUSY)) | |
307 | continue; | |
308 | if ((bp->b_flags & B_DELWRI) == 0) | |
309 | panic("vflushbuf: not dirty"); | |
310 | bremfree(bp); | |
311 | bp->b_flags |= B_BUSY; | |
312 | splx(s); | |
313 | /* | |
314 | * Wait for I/O associated with indirect blocks to complete, | |
315 | * since there is no way to quickly wait for them below. | |
316 | * NB: This is really specific to ufs, but is done here | |
317 | * as it is easier and quicker. | |
318 | */ | |
77dc8a8c | 319 | if (bp->b_vp == vp || (flags & B_SYNC) == 0) |
76429560 | 320 | (void) bawrite(bp); |
77dc8a8c | 321 | else |
76429560 | 322 | (void) bwrite(bp); |
77dc8a8c | 323 | goto loop; |
76429560 KM |
324 | } |
325 | splx(s); | |
326 | if ((flags & B_SYNC) == 0) | |
327 | return; | |
328 | s = splbio(); | |
329 | while (vp->v_numoutput) { | |
330 | vp->v_flag |= VBWAIT; | |
331 | sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1); | |
332 | } | |
333 | splx(s); | |
334 | if (vp->v_dirtyblkhd) { | |
335 | vprint("vflushbuf: dirty", vp); | |
336 | goto loop; | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * Update outstanding I/O count and do wakeup if requested. | |
342 | */ | |
343 | vwakeup(bp) | |
344 | register struct buf *bp; | |
345 | { | |
346 | register struct vnode *vp; | |
347 | ||
348 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
349 | if (vp = bp->b_vp) { | |
350 | vp->v_numoutput--; | |
351 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
352 | if (vp->v_numoutput < 0) | |
353 | panic("vwakeup: neg numoutput"); | |
354 | vp->v_flag &= ~VBWAIT; | |
355 | wakeup((caddr_t)&vp->v_numoutput); | |
356 | } | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * Invalidate in core blocks belonging to closed or umounted filesystem | |
362 | * | |
363 | * Go through the list of vnodes associated with the file system; | |
364 | * for each vnode invalidate any buffers that it holds. Normally | |
365 | * this routine is preceeded by a bflush call, so that on a quiescent | |
366 | * filesystem there will be no dirty buffers when we are done. Binval | |
367 | * returns the count of dirty buffers when it is finished. | |
368 | */ | |
369 | mntinvalbuf(mountp) | |
370 | struct mount *mountp; | |
371 | { | |
372 | register struct vnode *vp; | |
373 | int dirty = 0; | |
374 | ||
375 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
376 | panic("mntinvalbuf: not busy"); | |
377 | loop: | |
378 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
379 | if (vget(vp)) | |
380 | goto loop; | |
381 | dirty += vinvalbuf(vp, 1); | |
382 | vput(vp); | |
383 | if (vp->v_mount != mountp) | |
384 | goto loop; | |
385 | } | |
386 | return (dirty); | |
387 | } | |
388 | ||
389 | /* | |
390 | * Flush out and invalidate all buffers associated with a vnode. | |
391 | * Called with the underlying object locked. | |
392 | */ | |
393 | vinvalbuf(vp, save) | |
394 | register struct vnode *vp; | |
395 | int save; | |
396 | { | |
397 | register struct buf *bp; | |
398 | struct buf *nbp, *blist; | |
399 | int s, dirty = 0; | |
400 | ||
401 | for (;;) { | |
402 | if (blist = vp->v_dirtyblkhd) | |
403 | /* void */; | |
404 | else if (blist = vp->v_cleanblkhd) | |
405 | /* void */; | |
406 | else | |
407 | break; | |
408 | for (bp = blist; bp; bp = nbp) { | |
409 | nbp = bp->b_blockf; | |
410 | s = splbio(); | |
411 | if (bp->b_flags & B_BUSY) { | |
412 | bp->b_flags |= B_WANTED; | |
413 | sleep((caddr_t)bp, PRIBIO + 1); | |
414 | splx(s); | |
415 | break; | |
416 | } | |
417 | bremfree(bp); | |
418 | bp->b_flags |= B_BUSY; | |
419 | splx(s); | |
420 | if (save && (bp->b_flags & B_DELWRI)) { | |
24e9a81d KM |
421 | dirty++; |
422 | (void) VOP_BWRITE(bp); | |
76429560 KM |
423 | break; |
424 | } | |
425 | if (bp->b_vp != vp) | |
426 | reassignbuf(bp, bp->b_vp); | |
427 | else | |
428 | bp->b_flags |= B_INVAL; | |
429 | brelse(bp); | |
430 | } | |
431 | } | |
432 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
433 | panic("vinvalbuf: flush failed"); | |
434 | return (dirty); | |
435 | } | |
436 | ||
437 | /* | |
438 | * Associate a buffer with a vnode. | |
439 | */ | |
440 | bgetvp(vp, bp) | |
441 | register struct vnode *vp; | |
442 | register struct buf *bp; | |
443 | { | |
8136adfc KM |
444 | register struct vnode *vq; |
445 | register struct buf *bq; | |
76429560 KM |
446 | |
447 | if (bp->b_vp) | |
448 | panic("bgetvp: not free"); | |
449 | VHOLD(vp); | |
450 | bp->b_vp = vp; | |
451 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
452 | bp->b_dev = vp->v_rdev; | |
453 | else | |
454 | bp->b_dev = NODEV; | |
455 | /* | |
456 | * Insert onto list for new vnode. | |
457 | */ | |
8136adfc KM |
458 | if (bq = vp->v_cleanblkhd) |
459 | bq->b_blockb = &bp->b_blockf; | |
460 | bp->b_blockf = bq; | |
461 | bp->b_blockb = &vp->v_cleanblkhd; | |
462 | vp->v_cleanblkhd = bp; | |
76429560 KM |
463 | } |
464 | ||
465 | /* | |
466 | * Disassociate a buffer from a vnode. | |
467 | */ | |
468 | brelvp(bp) | |
469 | register struct buf *bp; | |
470 | { | |
471 | struct buf *bq; | |
472 | struct vnode *vp; | |
473 | ||
474 | if (bp->b_vp == (struct vnode *) 0) | |
475 | panic("brelvp: NULL"); | |
476 | /* | |
477 | * Delete from old vnode list, if on one. | |
478 | */ | |
479 | if (bp->b_blockb) { | |
480 | if (bq = bp->b_blockf) | |
481 | bq->b_blockb = bp->b_blockb; | |
482 | *bp->b_blockb = bq; | |
483 | bp->b_blockf = NULL; | |
484 | bp->b_blockb = NULL; | |
485 | } | |
486 | vp = bp->b_vp; | |
487 | bp->b_vp = (struct vnode *) 0; | |
488 | HOLDRELE(vp); | |
489 | } | |
490 | ||
491 | /* | |
492 | * Reassign a buffer from one vnode to another. | |
493 | * Used to assign file specific control information | |
494 | * (indirect blocks) to the vnode to which they belong. | |
495 | */ | |
496 | reassignbuf(bp, newvp) | |
497 | register struct buf *bp; | |
498 | register struct vnode *newvp; | |
499 | { | |
500 | register struct buf *bq, **listheadp; | |
501 | ||
502 | if (newvp == NULL) | |
503 | panic("reassignbuf: NULL"); | |
504 | /* | |
505 | * Delete from old vnode list, if on one. | |
506 | */ | |
507 | if (bp->b_blockb) { | |
508 | if (bq = bp->b_blockf) | |
509 | bq->b_blockb = bp->b_blockb; | |
510 | *bp->b_blockb = bq; | |
511 | } | |
512 | /* | |
513 | * If dirty, put on list of dirty buffers; | |
514 | * otherwise insert onto list of clean buffers. | |
515 | */ | |
516 | if (bp->b_flags & B_DELWRI) | |
517 | listheadp = &newvp->v_dirtyblkhd; | |
518 | else | |
519 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
520 | if (bq = *listheadp) |
521 | bq->b_blockb = &bp->b_blockf; | |
522 | bp->b_blockf = bq; | |
523 | bp->b_blockb = listheadp; | |
524 | *listheadp = bp; | |
76429560 KM |
525 | } |
526 | ||
36d09cb1 | 527 | /* |
ef24f6dd KM |
528 | * Create a vnode for a block device. |
529 | * Used for root filesystem, argdev, and swap areas. | |
530 | * Also used for memory file system special devices. | |
531 | */ | |
532 | bdevvp(dev, vpp) | |
533 | dev_t dev; | |
534 | struct vnode **vpp; | |
535 | { | |
ef24f6dd KM |
536 | register struct vnode *vp; |
537 | struct vnode *nvp; | |
538 | int error; | |
539 | ||
1c89915d KM |
540 | if (dev == NODEV) |
541 | return (0); | |
4ef5d036 | 542 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
543 | if (error) { |
544 | *vpp = 0; | |
545 | return (error); | |
546 | } | |
547 | vp = nvp; | |
548 | vp->v_type = VBLK; | |
c0de8792 | 549 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
550 | vput(vp); |
551 | vp = nvp; | |
552 | } | |
553 | *vpp = vp; | |
554 | return (0); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Check to see if the new vnode represents a special device | |
559 | * for which we already have a vnode (either because of | |
560 | * bdevvp() or because of a different vnode representing | |
561 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 562 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
563 | * caller is responsible for filling it with its new contents. |
564 | */ | |
565 | struct vnode * | |
c0de8792 | 566 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 567 | register struct vnode *nvp; |
c0de8792 | 568 | dev_t nvp_rdev; |
ef24f6dd KM |
569 | struct mount *mp; |
570 | { | |
571 | register struct vnode *vp; | |
c0de8792 | 572 | struct vnode **vpp; |
ef24f6dd KM |
573 | |
574 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 575 | return (NULLVP); |
c0de8792 KM |
576 | |
577 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 578 | loop: |
c0de8792 KM |
579 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
580 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 581 | continue; |
c0de8792 KM |
582 | /* |
583 | * Alias, but not in use, so flush it out. | |
584 | */ | |
7f7b7d89 | 585 | if (vp->v_usecount == 0) { |
c0de8792 KM |
586 | vgone(vp); |
587 | goto loop; | |
588 | } | |
ef62830d KM |
589 | if (vget(vp)) |
590 | goto loop; | |
ef24f6dd KM |
591 | break; |
592 | } | |
c0de8792 | 593 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
594 | MALLOC(nvp->v_specinfo, struct specinfo *, |
595 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
596 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 597 | nvp->v_hashchain = vpp; |
c0de8792 | 598 | nvp->v_specnext = *vpp; |
2c957a90 | 599 | nvp->v_specflags = 0; |
c0de8792 | 600 | *vpp = nvp; |
40452d5e KM |
601 | if (vp != NULL) { |
602 | nvp->v_flag |= VALIASED; | |
603 | vp->v_flag |= VALIASED; | |
604 | vput(vp); | |
605 | } | |
54fb9dc2 | 606 | return (NULLVP); |
ef24f6dd | 607 | } |
2bae1875 KM |
608 | VOP_UNLOCK(vp); |
609 | vclean(vp, 0); | |
ef24f6dd KM |
610 | vp->v_op = nvp->v_op; |
611 | vp->v_tag = nvp->v_tag; | |
612 | nvp->v_type = VNON; | |
613 | insmntque(vp, mp); | |
614 | return (vp); | |
615 | } | |
616 | ||
617 | /* | |
618 | * Grab a particular vnode from the free list, increment its | |
619 | * reference count and lock it. The vnode lock bit is set the | |
620 | * vnode is being eliminated in vgone. The process is awakened | |
621 | * when the transition is completed, and an error returned to | |
622 | * indicate that the vnode is no longer usable (possibly having | |
623 | * been changed to a new file system type). | |
36d09cb1 KM |
624 | */ |
625 | vget(vp) | |
626 | register struct vnode *vp; | |
627 | { | |
628 | register struct vnode *vq; | |
629 | ||
ef24f6dd KM |
630 | if (vp->v_flag & VXLOCK) { |
631 | vp->v_flag |= VXWANT; | |
632 | sleep((caddr_t)vp, PINOD); | |
633 | return (1); | |
634 | } | |
7f7b7d89 | 635 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
636 | if (vq = vp->v_freef) |
637 | vq->v_freeb = vp->v_freeb; | |
638 | else | |
639 | vfreet = vp->v_freeb; | |
640 | *vp->v_freeb = vq; | |
641 | vp->v_freef = NULL; | |
642 | vp->v_freeb = NULL; | |
643 | } | |
36d09cb1 | 644 | VREF(vp); |
ef24f6dd KM |
645 | VOP_LOCK(vp); |
646 | return (0); | |
36d09cb1 KM |
647 | } |
648 | ||
649 | /* | |
650 | * Vnode reference, just increment the count | |
651 | */ | |
652 | void vref(vp) | |
653 | struct vnode *vp; | |
654 | { | |
655 | ||
7f7b7d89 | 656 | vp->v_usecount++; |
36d09cb1 KM |
657 | } |
658 | ||
659 | /* | |
660 | * vput(), just unlock and vrele() | |
661 | */ | |
662 | void vput(vp) | |
663 | register struct vnode *vp; | |
664 | { | |
665 | VOP_UNLOCK(vp); | |
666 | vrele(vp); | |
667 | } | |
668 | ||
669 | /* | |
670 | * Vnode release. | |
671 | * If count drops to zero, call inactive routine and return to freelist. | |
672 | */ | |
673 | void vrele(vp) | |
674 | register struct vnode *vp; | |
675 | { | |
c099667a | 676 | struct proc *p = curproc; /* XXX */ |
36d09cb1 | 677 | |
65c3b3a8 | 678 | #ifdef DIAGNOSTIC |
36d09cb1 | 679 | if (vp == NULL) |
ef24f6dd | 680 | panic("vrele: null vp"); |
65c3b3a8 | 681 | #endif |
7f7b7d89 | 682 | vp->v_usecount--; |
7f7b7d89 | 683 | if (vp->v_usecount > 0) |
36d09cb1 | 684 | return; |
65c3b3a8 KM |
685 | #ifdef DIAGNOSTIC |
686 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
687 | vprint("vrele: bad ref count", vp); | |
688 | panic("vrele: ref cnt"); | |
689 | } | |
690 | #endif | |
54fb9dc2 | 691 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
692 | /* |
693 | * insert into empty list | |
694 | */ | |
695 | vfreeh = vp; | |
696 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
697 | } else { |
698 | /* | |
699 | * insert at tail of list | |
700 | */ | |
701 | *vfreet = vp; | |
702 | vp->v_freeb = vfreet; | |
36d09cb1 | 703 | } |
ef24f6dd KM |
704 | vp->v_freef = NULL; |
705 | vfreet = &vp->v_freef; | |
c099667a | 706 | VOP_INACTIVE(vp, p); |
ef24f6dd KM |
707 | } |
708 | ||
7f7b7d89 KM |
709 | /* |
710 | * Page or buffer structure gets a reference. | |
711 | */ | |
712 | vhold(vp) | |
713 | register struct vnode *vp; | |
714 | { | |
715 | ||
716 | vp->v_holdcnt++; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Page or buffer structure frees a reference. | |
721 | */ | |
722 | holdrele(vp) | |
723 | register struct vnode *vp; | |
724 | { | |
725 | ||
726 | if (vp->v_holdcnt <= 0) | |
727 | panic("holdrele: holdcnt"); | |
728 | vp->v_holdcnt--; | |
729 | } | |
730 | ||
f0556f86 KM |
731 | /* |
732 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
733 | * | |
734 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
735 | * return error if any are found (nb: this is a user error, not a | |
736 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
737 | * that are found. | |
738 | */ | |
739 | int busyprt = 0; /* patch to print out busy vnodes */ | |
740 | ||
741 | vflush(mp, skipvp, flags) | |
742 | struct mount *mp; | |
743 | struct vnode *skipvp; | |
744 | int flags; | |
745 | { | |
746 | register struct vnode *vp, *nvp; | |
747 | int busy = 0; | |
748 | ||
54fb9dc2 | 749 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 750 | panic("vflush: not busy"); |
4597dd33 | 751 | loop: |
54fb9dc2 | 752 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
753 | if (vp->v_mount != mp) |
754 | goto loop; | |
f0556f86 KM |
755 | nvp = vp->v_mountf; |
756 | /* | |
757 | * Skip over a selected vnode. | |
f0556f86 KM |
758 | */ |
759 | if (vp == skipvp) | |
760 | continue; | |
36ef03ec KM |
761 | /* |
762 | * Skip over a vnodes marked VSYSTEM. | |
763 | */ | |
764 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
765 | continue; | |
f0556f86 | 766 | /* |
7f7b7d89 | 767 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
768 | * out the vnode data structures and we are done. |
769 | */ | |
7f7b7d89 | 770 | if (vp->v_usecount == 0) { |
f0556f86 KM |
771 | vgone(vp); |
772 | continue; | |
773 | } | |
774 | /* | |
775 | * For block or character devices, revert to an | |
776 | * anonymous device. For all other files, just kill them. | |
777 | */ | |
36ef03ec | 778 | if (flags & FORCECLOSE) { |
f0556f86 KM |
779 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
780 | vgone(vp); | |
781 | } else { | |
782 | vclean(vp, 0); | |
783 | vp->v_op = &spec_vnodeops; | |
784 | insmntque(vp, (struct mount *)0); | |
785 | } | |
786 | continue; | |
787 | } | |
788 | if (busyprt) | |
0bf84b18 | 789 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
790 | busy++; |
791 | } | |
792 | if (busy) | |
793 | return (EBUSY); | |
794 | return (0); | |
795 | } | |
796 | ||
ef24f6dd KM |
797 | /* |
798 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 799 | */ |
36ef03ec | 800 | void vclean(vp, flags) |
ef24f6dd | 801 | register struct vnode *vp; |
aacc1bff | 802 | int flags; |
ef24f6dd KM |
803 | { |
804 | struct vnodeops *origops; | |
2bae1875 | 805 | int active; |
c099667a | 806 | struct proc *p = curproc; /* XXX */ |
ef24f6dd | 807 | |
2bae1875 KM |
808 | /* |
809 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
810 | * If so we have to reference it before we clean it out |
811 | * so that its count cannot fall to zero and generate a | |
812 | * race against ourselves to recycle it. | |
2bae1875 | 813 | */ |
7f7b7d89 | 814 | if (active = vp->v_usecount) |
2bae1875 | 815 | VREF(vp); |
2bae1875 KM |
816 | /* |
817 | * Prevent the vnode from being recycled or | |
818 | * brought into use while we clean it out. | |
819 | */ | |
0bf84b18 KM |
820 | if (vp->v_flag & VXLOCK) |
821 | panic("vclean: deadlock"); | |
ef24f6dd | 822 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
823 | /* |
824 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
825 | * have the object locked while it cleans it out. The VOP_LOCK | |
826 | * ensures that the VOP_INACTIVE routine is done with its work. | |
827 | * For active vnodes, it ensures that no other activity can | |
828 | * occur while the buffer list is being cleaned out. | |
829 | */ | |
830 | VOP_LOCK(vp); | |
36ef03ec | 831 | if (flags & DOCLOSE) |
0bf84b18 | 832 | vinvalbuf(vp, 1); |
ef24f6dd KM |
833 | /* |
834 | * Prevent any further operations on the vnode from | |
835 | * being passed through to the old file system. | |
836 | */ | |
837 | origops = vp->v_op; | |
838 | vp->v_op = &dead_vnodeops; | |
839 | vp->v_tag = VT_NON; | |
840 | /* | |
2bae1875 KM |
841 | * If purging an active vnode, it must be unlocked, closed, |
842 | * and deactivated before being reclaimed. | |
ef24f6dd | 843 | */ |
20454d5a | 844 | (*(origops->vop_unlock))(vp); |
2bae1875 | 845 | if (active) { |
36ef03ec | 846 | if (flags & DOCLOSE) |
20454d5a KM |
847 | (*(origops->vop_close))(vp, IO_NDELAY, NOCRED, p); |
848 | (*(origops->vop_inactive))(vp, p); | |
ef24f6dd KM |
849 | } |
850 | /* | |
851 | * Reclaim the vnode. | |
852 | */ | |
20454d5a | 853 | if ((*(origops->vop_reclaim))(vp)) |
ef24f6dd | 854 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
855 | if (active) |
856 | vrele(vp); | |
ef24f6dd KM |
857 | /* |
858 | * Done with purge, notify sleepers in vget of the grim news. | |
859 | */ | |
860 | vp->v_flag &= ~VXLOCK; | |
861 | if (vp->v_flag & VXWANT) { | |
862 | vp->v_flag &= ~VXWANT; | |
863 | wakeup((caddr_t)vp); | |
864 | } | |
865 | } | |
866 | ||
ef62830d KM |
867 | /* |
868 | * Eliminate all activity associated with the requested vnode | |
869 | * and with all vnodes aliased to the requested vnode. | |
870 | */ | |
871 | void vgoneall(vp) | |
872 | register struct vnode *vp; | |
873 | { | |
7f7b7d89 | 874 | register struct vnode *vq; |
ef62830d | 875 | |
7a7b3a95 KM |
876 | if (vp->v_flag & VALIASED) { |
877 | /* | |
878 | * If a vgone (or vclean) is already in progress, | |
879 | * wait until it is done and return. | |
880 | */ | |
881 | if (vp->v_flag & VXLOCK) { | |
882 | vp->v_flag |= VXWANT; | |
883 | sleep((caddr_t)vp, PINOD); | |
884 | return; | |
885 | } | |
886 | /* | |
887 | * Ensure that vp will not be vgone'd while we | |
888 | * are eliminating its aliases. | |
889 | */ | |
890 | vp->v_flag |= VXLOCK; | |
891 | while (vp->v_flag & VALIASED) { | |
892 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
893 | if (vq->v_rdev != vp->v_rdev || | |
894 | vq->v_type != vp->v_type || vp == vq) | |
895 | continue; | |
896 | vgone(vq); | |
897 | break; | |
898 | } | |
ef62830d | 899 | } |
7a7b3a95 KM |
900 | /* |
901 | * Remove the lock so that vgone below will | |
902 | * really eliminate the vnode after which time | |
903 | * vgone will awaken any sleepers. | |
904 | */ | |
905 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
906 | } |
907 | vgone(vp); | |
908 | } | |
909 | ||
ef24f6dd KM |
910 | /* |
911 | * Eliminate all activity associated with a vnode | |
912 | * in preparation for reuse. | |
913 | */ | |
914 | void vgone(vp) | |
915 | register struct vnode *vp; | |
916 | { | |
7f7b7d89 | 917 | register struct vnode *vq; |
c0de8792 KM |
918 | struct vnode *vx; |
919 | long count; | |
ef24f6dd | 920 | |
4f55e3ec KM |
921 | /* |
922 | * If a vgone (or vclean) is already in progress, | |
923 | * wait until it is done and return. | |
924 | */ | |
925 | if (vp->v_flag & VXLOCK) { | |
926 | vp->v_flag |= VXWANT; | |
927 | sleep((caddr_t)vp, PINOD); | |
928 | return; | |
929 | } | |
ef24f6dd KM |
930 | /* |
931 | * Clean out the filesystem specific data. | |
932 | */ | |
36ef03ec | 933 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
934 | /* |
935 | * Delete from old mount point vnode list, if on one. | |
936 | */ | |
937 | if (vp->v_mountb) { | |
938 | if (vq = vp->v_mountf) | |
939 | vq->v_mountb = vp->v_mountb; | |
940 | *vp->v_mountb = vq; | |
941 | vp->v_mountf = NULL; | |
942 | vp->v_mountb = NULL; | |
943 | } | |
944 | /* | |
945 | * If special device, remove it from special device alias list. | |
946 | */ | |
947 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
948 | if (*vp->v_hashchain == vp) { |
949 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 950 | } else { |
7f7b7d89 | 951 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 952 | if (vq->v_specnext != vp) |
ef24f6dd | 953 | continue; |
c0de8792 | 954 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
955 | break; |
956 | } | |
c0de8792 | 957 | if (vq == NULL) |
ef24f6dd KM |
958 | panic("missing bdev"); |
959 | } | |
c0de8792 | 960 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
961 | count = 0; |
962 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
963 | if (vq->v_rdev != vp->v_rdev || |
964 | vq->v_type != vp->v_type) | |
c0de8792 KM |
965 | continue; |
966 | count++; | |
967 | vx = vq; | |
968 | } | |
969 | if (count == 0) | |
970 | panic("missing alias"); | |
971 | if (count == 1) | |
972 | vx->v_flag &= ~VALIASED; | |
973 | vp->v_flag &= ~VALIASED; | |
974 | } | |
975 | FREE(vp->v_specinfo, M_VNODE); | |
976 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
977 | } |
978 | /* | |
979 | * If it is on the freelist, move it to the head of the list. | |
980 | */ | |
981 | if (vp->v_freeb) { | |
982 | if (vq = vp->v_freef) | |
983 | vq->v_freeb = vp->v_freeb; | |
984 | else | |
985 | vfreet = vp->v_freeb; | |
986 | *vp->v_freeb = vq; | |
987 | vp->v_freef = vfreeh; | |
988 | vp->v_freeb = &vfreeh; | |
989 | vfreeh->v_freeb = &vp->v_freef; | |
990 | vfreeh = vp; | |
991 | } | |
2bae1875 | 992 | vp->v_type = VBAD; |
36d09cb1 | 993 | } |
ef62830d | 994 | |
2bcd6066 KM |
995 | /* |
996 | * Lookup a vnode by device number. | |
997 | */ | |
998 | vfinddev(dev, type, vpp) | |
999 | dev_t dev; | |
1000 | enum vtype type; | |
1001 | struct vnode **vpp; | |
1002 | { | |
1003 | register struct vnode *vp; | |
1004 | ||
1005 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
1006 | if (dev != vp->v_rdev || type != vp->v_type) | |
1007 | continue; | |
1008 | *vpp = vp; | |
1009 | return (0); | |
1010 | } | |
1011 | return (1); | |
1012 | } | |
1013 | ||
ef62830d KM |
1014 | /* |
1015 | * Calculate the total number of references to a special device. | |
1016 | */ | |
1017 | vcount(vp) | |
1018 | register struct vnode *vp; | |
1019 | { | |
7f7b7d89 | 1020 | register struct vnode *vq; |
ef62830d KM |
1021 | int count; |
1022 | ||
1023 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 1024 | return (vp->v_usecount); |
ef62830d | 1025 | loop: |
7f7b7d89 | 1026 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 1027 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1028 | continue; |
1029 | /* | |
1030 | * Alias, but not in use, so flush it out. | |
1031 | */ | |
7f7b7d89 | 1032 | if (vq->v_usecount == 0) { |
ef62830d KM |
1033 | vgone(vq); |
1034 | goto loop; | |
1035 | } | |
7f7b7d89 | 1036 | count += vq->v_usecount; |
ef62830d KM |
1037 | } |
1038 | return (count); | |
1039 | } | |
0bf84b18 KM |
1040 | |
1041 | /* | |
1042 | * Print out a description of a vnode. | |
1043 | */ | |
1044 | static char *typename[] = | |
61f846a8 | 1045 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1046 | |
1047 | vprint(label, vp) | |
1048 | char *label; | |
1049 | register struct vnode *vp; | |
1050 | { | |
f2f730c6 | 1051 | char buf[64]; |
0bf84b18 KM |
1052 | |
1053 | if (label != NULL) | |
1054 | printf("%s: ", label); | |
65c3b3a8 KM |
1055 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1056 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1057 | vp->v_holdcnt); | |
f2f730c6 KM |
1058 | buf[0] = '\0'; |
1059 | if (vp->v_flag & VROOT) | |
1060 | strcat(buf, "|VROOT"); | |
1061 | if (vp->v_flag & VTEXT) | |
1062 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1063 | if (vp->v_flag & VSYSTEM) |
1064 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1065 | if (vp->v_flag & VXLOCK) |
1066 | strcat(buf, "|VXLOCK"); | |
1067 | if (vp->v_flag & VXWANT) | |
1068 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1069 | if (vp->v_flag & VBWAIT) |
1070 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1071 | if (vp->v_flag & VALIASED) |
1072 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1073 | if (buf[0] != '\0') |
1074 | printf(" flags (%s)", &buf[1]); | |
1075 | printf("\n\t"); | |
0bf84b18 KM |
1076 | VOP_PRINT(vp); |
1077 | } | |
985cbdd5 | 1078 | |
34c62e18 KM |
1079 | #ifdef DEBUG |
1080 | /* | |
1081 | * List all of the locked vnodes in the system. | |
1082 | * Called when debugging the kernel. | |
1083 | */ | |
1084 | printlockedvnodes() | |
1085 | { | |
1086 | register struct mount *mp; | |
1087 | register struct vnode *vp; | |
1088 | ||
1089 | printf("Locked vnodes\n"); | |
1090 | mp = rootfs; | |
1091 | do { | |
1092 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1093 | if (VOP_ISLOCKED(vp)) | |
1094 | vprint((char *)0, vp); | |
1095 | mp = mp->mnt_next; | |
1096 | } while (mp != rootfs); | |
1097 | } | |
1098 | #endif | |
1099 | ||
985cbdd5 MT |
1100 | int kinfo_vdebug = 1; |
1101 | int kinfo_vgetfailed; | |
1102 | #define KINFO_VNODESLOP 10 | |
1103 | /* | |
1104 | * Dump vnode list (via kinfo). | |
1105 | * Copyout address of vnode followed by vnode. | |
1106 | */ | |
aacc1bff | 1107 | /* ARGSUSED */ |
985cbdd5 | 1108 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1109 | int op; |
985cbdd5 | 1110 | char *where; |
aacc1bff | 1111 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1112 | { |
1113 | register struct mount *mp = rootfs; | |
36ef03ec | 1114 | struct mount *omp; |
985cbdd5 | 1115 | struct vnode *vp; |
985cbdd5 MT |
1116 | register char *bp = where, *savebp; |
1117 | char *ewhere = where + *acopysize; | |
1118 | int error; | |
1119 | ||
1120 | #define VPTRSZ sizeof (struct vnode *) | |
1121 | #define VNODESZ sizeof (struct vnode) | |
1122 | if (where == NULL) { | |
1123 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1124 | return (0); | |
1125 | } | |
1126 | ||
985cbdd5 | 1127 | do { |
36ef03ec | 1128 | if (vfs_busy(mp)) { |
54fb9dc2 | 1129 | mp = mp->mnt_next; |
36ef03ec KM |
1130 | continue; |
1131 | } | |
985cbdd5 MT |
1132 | savebp = bp; |
1133 | again: | |
4597dd33 | 1134 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1135 | /* |
1136 | * Check that the vp is still associated with | |
1137 | * this filesystem. RACE: could have been | |
1138 | * recycled onto the same filesystem. | |
1139 | */ | |
4597dd33 KM |
1140 | if (vp->v_mount != mp) { |
1141 | if (kinfo_vdebug) | |
1142 | printf("kinfo: vp changed\n"); | |
1143 | bp = savebp; | |
1144 | goto again; | |
1145 | } | |
985cbdd5 MT |
1146 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1147 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1148 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1149 | VNODESZ)))) |
985cbdd5 | 1150 | return (error); |
985cbdd5 | 1151 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1152 | } |
36ef03ec | 1153 | omp = mp; |
54fb9dc2 | 1154 | mp = mp->mnt_next; |
36ef03ec | 1155 | vfs_unbusy(omp); |
985cbdd5 MT |
1156 | } while (mp != rootfs); |
1157 | ||
1158 | *aneeded = bp - where; | |
1159 | if (bp > ewhere) | |
1160 | *acopysize = ewhere - where; | |
1161 | else | |
1162 | *acopysize = bp - where; | |
1163 | return (0); | |
1164 | } |