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 | * |
d024c2ce | 7 | * @(#)vfs_subr.c 7.81 (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 | 312 | { |
9342689a | 313 | USES_VOP_BWRITE; |
d024c2ce | 314 | USES_VOP_FSYNC; |
76429560 KM |
315 | register struct buf *bp; |
316 | struct buf *nbp, *blist; | |
d024c2ce | 317 | int s, error; |
76429560 | 318 | |
d024c2ce KM |
319 | if (save) { |
320 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) | |
321 | return (error); | |
322 | if (vp->v_dirtyblkhd != NULL) | |
323 | panic("vinvalbuf: dirty bufs"); | |
324 | } | |
76429560 | 325 | for (;;) { |
d024c2ce | 326 | if (blist = vp->v_cleanblkhd) |
76429560 | 327 | /* void */; |
d024c2ce | 328 | else if (blist = vp->v_dirtyblkhd) |
76429560 KM |
329 | /* void */; |
330 | else | |
331 | break; | |
332 | for (bp = blist; bp; bp = nbp) { | |
333 | nbp = bp->b_blockf; | |
334 | s = splbio(); | |
335 | if (bp->b_flags & B_BUSY) { | |
336 | bp->b_flags |= B_WANTED; | |
337 | sleep((caddr_t)bp, PRIBIO + 1); | |
338 | splx(s); | |
339 | break; | |
340 | } | |
341 | bremfree(bp); | |
342 | bp->b_flags |= B_BUSY; | |
343 | splx(s); | |
76429560 KM |
344 | if (bp->b_vp != vp) |
345 | reassignbuf(bp, bp->b_vp); | |
346 | else | |
347 | bp->b_flags |= B_INVAL; | |
348 | brelse(bp); | |
349 | } | |
350 | } | |
351 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
352 | panic("vinvalbuf: flush failed"); | |
d024c2ce | 353 | return (0); |
76429560 KM |
354 | } |
355 | ||
356 | /* | |
357 | * Associate a buffer with a vnode. | |
358 | */ | |
359 | bgetvp(vp, bp) | |
360 | register struct vnode *vp; | |
361 | register struct buf *bp; | |
362 | { | |
8136adfc KM |
363 | register struct vnode *vq; |
364 | register struct buf *bq; | |
76429560 KM |
365 | |
366 | if (bp->b_vp) | |
367 | panic("bgetvp: not free"); | |
368 | VHOLD(vp); | |
369 | bp->b_vp = vp; | |
370 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
371 | bp->b_dev = vp->v_rdev; | |
372 | else | |
373 | bp->b_dev = NODEV; | |
374 | /* | |
375 | * Insert onto list for new vnode. | |
376 | */ | |
8136adfc KM |
377 | if (bq = vp->v_cleanblkhd) |
378 | bq->b_blockb = &bp->b_blockf; | |
379 | bp->b_blockf = bq; | |
380 | bp->b_blockb = &vp->v_cleanblkhd; | |
381 | vp->v_cleanblkhd = bp; | |
76429560 KM |
382 | } |
383 | ||
384 | /* | |
385 | * Disassociate a buffer from a vnode. | |
386 | */ | |
387 | brelvp(bp) | |
388 | register struct buf *bp; | |
389 | { | |
390 | struct buf *bq; | |
391 | struct vnode *vp; | |
392 | ||
393 | if (bp->b_vp == (struct vnode *) 0) | |
394 | panic("brelvp: NULL"); | |
395 | /* | |
396 | * Delete from old vnode list, if on one. | |
397 | */ | |
398 | if (bp->b_blockb) { | |
399 | if (bq = bp->b_blockf) | |
400 | bq->b_blockb = bp->b_blockb; | |
401 | *bp->b_blockb = bq; | |
402 | bp->b_blockf = NULL; | |
403 | bp->b_blockb = NULL; | |
404 | } | |
405 | vp = bp->b_vp; | |
406 | bp->b_vp = (struct vnode *) 0; | |
407 | HOLDRELE(vp); | |
408 | } | |
409 | ||
410 | /* | |
411 | * Reassign a buffer from one vnode to another. | |
412 | * Used to assign file specific control information | |
413 | * (indirect blocks) to the vnode to which they belong. | |
414 | */ | |
415 | reassignbuf(bp, newvp) | |
416 | register struct buf *bp; | |
417 | register struct vnode *newvp; | |
418 | { | |
419 | register struct buf *bq, **listheadp; | |
420 | ||
e5c3f16e KM |
421 | if (newvp == NULL) { |
422 | printf("reassignbuf: NULL"); | |
423 | return; | |
424 | } | |
76429560 KM |
425 | /* |
426 | * Delete from old vnode list, if on one. | |
427 | */ | |
428 | if (bp->b_blockb) { | |
429 | if (bq = bp->b_blockf) | |
430 | bq->b_blockb = bp->b_blockb; | |
431 | *bp->b_blockb = bq; | |
432 | } | |
433 | /* | |
434 | * If dirty, put on list of dirty buffers; | |
435 | * otherwise insert onto list of clean buffers. | |
436 | */ | |
437 | if (bp->b_flags & B_DELWRI) | |
438 | listheadp = &newvp->v_dirtyblkhd; | |
439 | else | |
440 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
441 | if (bq = *listheadp) |
442 | bq->b_blockb = &bp->b_blockf; | |
443 | bp->b_blockf = bq; | |
444 | bp->b_blockb = listheadp; | |
445 | *listheadp = bp; | |
76429560 KM |
446 | } |
447 | ||
36d09cb1 | 448 | /* |
ef24f6dd KM |
449 | * Create a vnode for a block device. |
450 | * Used for root filesystem, argdev, and swap areas. | |
451 | * Also used for memory file system special devices. | |
452 | */ | |
453 | bdevvp(dev, vpp) | |
454 | dev_t dev; | |
455 | struct vnode **vpp; | |
456 | { | |
ef24f6dd KM |
457 | register struct vnode *vp; |
458 | struct vnode *nvp; | |
459 | int error; | |
460 | ||
1c89915d KM |
461 | if (dev == NODEV) |
462 | return (0); | |
9342689a | 463 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
464 | if (error) { |
465 | *vpp = 0; | |
466 | return (error); | |
467 | } | |
468 | vp = nvp; | |
469 | vp->v_type = VBLK; | |
c0de8792 | 470 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
471 | vput(vp); |
472 | vp = nvp; | |
473 | } | |
474 | *vpp = vp; | |
475 | return (0); | |
476 | } | |
477 | ||
478 | /* | |
479 | * Check to see if the new vnode represents a special device | |
480 | * for which we already have a vnode (either because of | |
481 | * bdevvp() or because of a different vnode representing | |
482 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 483 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
484 | * caller is responsible for filling it with its new contents. |
485 | */ | |
486 | struct vnode * | |
c0de8792 | 487 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 488 | register struct vnode *nvp; |
c0de8792 | 489 | dev_t nvp_rdev; |
ef24f6dd KM |
490 | struct mount *mp; |
491 | { | |
9342689a | 492 | USES_VOP_UNLOCK; |
ef24f6dd | 493 | register struct vnode *vp; |
c0de8792 | 494 | struct vnode **vpp; |
ef24f6dd KM |
495 | |
496 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 497 | return (NULLVP); |
c0de8792 KM |
498 | |
499 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 500 | loop: |
c0de8792 KM |
501 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
502 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 503 | continue; |
c0de8792 KM |
504 | /* |
505 | * Alias, but not in use, so flush it out. | |
506 | */ | |
7f7b7d89 | 507 | if (vp->v_usecount == 0) { |
c0de8792 KM |
508 | vgone(vp); |
509 | goto loop; | |
510 | } | |
ef62830d KM |
511 | if (vget(vp)) |
512 | goto loop; | |
ef24f6dd KM |
513 | break; |
514 | } | |
c0de8792 | 515 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
516 | MALLOC(nvp->v_specinfo, struct specinfo *, |
517 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
518 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 519 | nvp->v_hashchain = vpp; |
c0de8792 | 520 | nvp->v_specnext = *vpp; |
2c957a90 | 521 | nvp->v_specflags = 0; |
c0de8792 | 522 | *vpp = nvp; |
40452d5e KM |
523 | if (vp != NULL) { |
524 | nvp->v_flag |= VALIASED; | |
525 | vp->v_flag |= VALIASED; | |
526 | vput(vp); | |
527 | } | |
54fb9dc2 | 528 | return (NULLVP); |
ef24f6dd | 529 | } |
2bae1875 KM |
530 | VOP_UNLOCK(vp); |
531 | vclean(vp, 0); | |
ef24f6dd KM |
532 | vp->v_op = nvp->v_op; |
533 | vp->v_tag = nvp->v_tag; | |
534 | nvp->v_type = VNON; | |
535 | insmntque(vp, mp); | |
536 | return (vp); | |
537 | } | |
538 | ||
539 | /* | |
540 | * Grab a particular vnode from the free list, increment its | |
541 | * reference count and lock it. The vnode lock bit is set the | |
542 | * vnode is being eliminated in vgone. The process is awakened | |
543 | * when the transition is completed, and an error returned to | |
544 | * indicate that the vnode is no longer usable (possibly having | |
545 | * been changed to a new file system type). | |
36d09cb1 KM |
546 | */ |
547 | vget(vp) | |
548 | register struct vnode *vp; | |
549 | { | |
9342689a | 550 | USES_VOP_LOCK; |
36d09cb1 KM |
551 | register struct vnode *vq; |
552 | ||
ef24f6dd KM |
553 | if (vp->v_flag & VXLOCK) { |
554 | vp->v_flag |= VXWANT; | |
555 | sleep((caddr_t)vp, PINOD); | |
556 | return (1); | |
557 | } | |
7f7b7d89 | 558 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
559 | if (vq = vp->v_freef) |
560 | vq->v_freeb = vp->v_freeb; | |
561 | else | |
562 | vfreet = vp->v_freeb; | |
563 | *vp->v_freeb = vq; | |
564 | vp->v_freef = NULL; | |
565 | vp->v_freeb = NULL; | |
566 | } | |
36d09cb1 | 567 | VREF(vp); |
ef24f6dd KM |
568 | VOP_LOCK(vp); |
569 | return (0); | |
36d09cb1 KM |
570 | } |
571 | ||
d32390ea KM |
572 | int bug_refs = 0; |
573 | ||
36d09cb1 KM |
574 | /* |
575 | * Vnode reference, just increment the count | |
576 | */ | |
577 | void vref(vp) | |
578 | struct vnode *vp; | |
579 | { | |
580 | ||
7f7b7d89 | 581 | vp->v_usecount++; |
d32390ea KM |
582 | if (vp->v_type != VBLK && curproc) |
583 | curproc->p_spare[0]++; | |
584 | if (bug_refs) | |
585 | vprint("vref: "); | |
36d09cb1 KM |
586 | } |
587 | ||
588 | /* | |
589 | * vput(), just unlock and vrele() | |
590 | */ | |
591 | void vput(vp) | |
592 | register struct vnode *vp; | |
593 | { | |
9342689a | 594 | USES_VOP_UNLOCK; |
4d1ee2eb | 595 | |
36d09cb1 KM |
596 | VOP_UNLOCK(vp); |
597 | vrele(vp); | |
598 | } | |
599 | ||
600 | /* | |
601 | * Vnode release. | |
602 | * If count drops to zero, call inactive routine and return to freelist. | |
603 | */ | |
604 | void vrele(vp) | |
605 | register struct vnode *vp; | |
606 | { | |
9342689a | 607 | USES_VOP_INACTIVE; |
36d09cb1 | 608 | |
65c3b3a8 | 609 | #ifdef DIAGNOSTIC |
36d09cb1 | 610 | if (vp == NULL) |
ef24f6dd | 611 | panic("vrele: null vp"); |
65c3b3a8 | 612 | #endif |
7f7b7d89 | 613 | vp->v_usecount--; |
d32390ea KM |
614 | if (vp->v_type != VBLK && curproc) |
615 | curproc->p_spare[0]--; | |
616 | if (bug_refs) | |
617 | vprint("vref: "); | |
7f7b7d89 | 618 | if (vp->v_usecount > 0) |
36d09cb1 | 619 | return; |
65c3b3a8 KM |
620 | #ifdef DIAGNOSTIC |
621 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
622 | vprint("vrele: bad ref count", vp); | |
623 | panic("vrele: ref cnt"); | |
624 | } | |
625 | #endif | |
54fb9dc2 | 626 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
627 | /* |
628 | * insert into empty list | |
629 | */ | |
630 | vfreeh = vp; | |
631 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
632 | } else { |
633 | /* | |
634 | * insert at tail of list | |
635 | */ | |
636 | *vfreet = vp; | |
637 | vp->v_freeb = vfreet; | |
36d09cb1 | 638 | } |
ef24f6dd KM |
639 | vp->v_freef = NULL; |
640 | vfreet = &vp->v_freef; | |
d024c2ce | 641 | VOP_INACTIVE(vp); |
ef24f6dd KM |
642 | } |
643 | ||
7f7b7d89 KM |
644 | /* |
645 | * Page or buffer structure gets a reference. | |
646 | */ | |
451df175 | 647 | void vhold(vp) |
7f7b7d89 KM |
648 | register struct vnode *vp; |
649 | { | |
650 | ||
651 | vp->v_holdcnt++; | |
652 | } | |
653 | ||
654 | /* | |
655 | * Page or buffer structure frees a reference. | |
656 | */ | |
451df175 | 657 | void holdrele(vp) |
7f7b7d89 KM |
658 | register struct vnode *vp; |
659 | { | |
660 | ||
661 | if (vp->v_holdcnt <= 0) | |
662 | panic("holdrele: holdcnt"); | |
663 | vp->v_holdcnt--; | |
664 | } | |
665 | ||
f0556f86 KM |
666 | /* |
667 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
668 | * | |
669 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
670 | * return error if any are found (nb: this is a user error, not a | |
671 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
672 | * that are found. | |
673 | */ | |
674 | int busyprt = 0; /* patch to print out busy vnodes */ | |
675 | ||
676 | vflush(mp, skipvp, flags) | |
677 | struct mount *mp; | |
678 | struct vnode *skipvp; | |
679 | int flags; | |
680 | { | |
681 | register struct vnode *vp, *nvp; | |
682 | int busy = 0; | |
683 | ||
54fb9dc2 | 684 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 685 | panic("vflush: not busy"); |
4597dd33 | 686 | loop: |
54fb9dc2 | 687 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
688 | if (vp->v_mount != mp) |
689 | goto loop; | |
f0556f86 KM |
690 | nvp = vp->v_mountf; |
691 | /* | |
692 | * Skip over a selected vnode. | |
f0556f86 KM |
693 | */ |
694 | if (vp == skipvp) | |
695 | continue; | |
36ef03ec KM |
696 | /* |
697 | * Skip over a vnodes marked VSYSTEM. | |
698 | */ | |
699 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
700 | continue; | |
f0556f86 | 701 | /* |
7f7b7d89 | 702 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
703 | * out the vnode data structures and we are done. |
704 | */ | |
7f7b7d89 | 705 | if (vp->v_usecount == 0) { |
f0556f86 KM |
706 | vgone(vp); |
707 | continue; | |
708 | } | |
709 | /* | |
710 | * For block or character devices, revert to an | |
711 | * anonymous device. For all other files, just kill them. | |
712 | */ | |
36ef03ec | 713 | if (flags & FORCECLOSE) { |
f0556f86 KM |
714 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
715 | vgone(vp); | |
716 | } else { | |
717 | vclean(vp, 0); | |
9342689a | 718 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
719 | insmntque(vp, (struct mount *)0); |
720 | } | |
721 | continue; | |
722 | } | |
723 | if (busyprt) | |
0bf84b18 | 724 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
725 | busy++; |
726 | } | |
727 | if (busy) | |
728 | return (EBUSY); | |
729 | return (0); | |
730 | } | |
731 | ||
ef24f6dd KM |
732 | /* |
733 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 734 | */ |
ecf75a7d KM |
735 | void |
736 | vclean(vp, flags) | |
ef24f6dd | 737 | register struct vnode *vp; |
aacc1bff | 738 | int flags; |
ef24f6dd | 739 | { |
9342689a | 740 | USES_VOP_LOCK; |
38c46eee JH |
741 | USES_VOP_UNLOCK; |
742 | USES_VOP_CLOSE; | |
743 | USES_VOP_INACTIVE; | |
744 | USES_VOP_RECLAIM; | |
745 | int (**origops)(); | |
2bae1875 | 746 | int active; |
ef24f6dd | 747 | |
2bae1875 KM |
748 | /* |
749 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
750 | * If so we have to reference it before we clean it out |
751 | * so that its count cannot fall to zero and generate a | |
752 | * race against ourselves to recycle it. | |
2bae1875 | 753 | */ |
7f7b7d89 | 754 | if (active = vp->v_usecount) |
2bae1875 | 755 | VREF(vp); |
2bae1875 KM |
756 | /* |
757 | * Prevent the vnode from being recycled or | |
758 | * brought into use while we clean it out. | |
759 | */ | |
0bf84b18 KM |
760 | if (vp->v_flag & VXLOCK) |
761 | panic("vclean: deadlock"); | |
ef24f6dd | 762 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
763 | /* |
764 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
765 | * have the object locked while it cleans it out. The VOP_LOCK | |
766 | * ensures that the VOP_INACTIVE routine is done with its work. | |
767 | * For active vnodes, it ensures that no other activity can | |
768 | * occur while the buffer list is being cleaned out. | |
769 | */ | |
770 | VOP_LOCK(vp); | |
36ef03ec | 771 | if (flags & DOCLOSE) |
d024c2ce | 772 | vinvalbuf(vp, 1, NOCRED, NULL); |
ef24f6dd KM |
773 | /* |
774 | * Prevent any further operations on the vnode from | |
775 | * being passed through to the old file system. | |
776 | */ | |
777 | origops = vp->v_op; | |
9342689a | 778 | vp->v_op = dead_vnodeop_p; |
ef24f6dd KM |
779 | vp->v_tag = VT_NON; |
780 | /* | |
2bae1875 KM |
781 | * If purging an active vnode, it must be unlocked, closed, |
782 | * and deactivated before being reclaimed. | |
ef24f6dd | 783 | */ |
38c46eee JH |
784 | vop_unlock_a.a_desc = VDESC(vop_unlock); |
785 | vop_unlock_a.a_vp = vp; | |
786 | VOCALL(origops,VOFFSET(vop_unlock),&vop_unlock_a); | |
2bae1875 | 787 | if (active) { |
38c46eee JH |
788 | /* |
789 | * Note: these next two calls imply | |
790 | * that vop_close and vop_inactive implementations | |
791 | * cannot count on the ops vector being correctly | |
792 | * set. | |
793 | */ | |
794 | if (flags & DOCLOSE) { | |
795 | vop_close_a.a_desc = VDESC(vop_close); | |
796 | vop_close_a.a_vp = vp; | |
797 | vop_close_a.a_fflag = IO_NDELAY; | |
d024c2ce | 798 | vop_close_a.a_p = NULL; |
38c46eee JH |
799 | VOCALL(origops,VOFFSET(vop_close),&vop_close_a); |
800 | }; | |
801 | vop_inactive_a.a_desc = VDESC(vop_inactive); | |
802 | vop_inactive_a.a_vp = vp; | |
38c46eee | 803 | VOCALL(origops,VOFFSET(vop_inactive),&vop_inactive_a); |
ef24f6dd KM |
804 | } |
805 | /* | |
806 | * Reclaim the vnode. | |
807 | */ | |
38c46eee JH |
808 | /* |
809 | * Emulate VOP_RECLAIM. | |
810 | */ | |
811 | vop_reclaim_a.a_desc = VDESC(vop_reclaim); | |
812 | vop_reclaim_a.a_vp = vp; | |
813 | if (VOCALL(origops,VOFFSET(vop_reclaim),&vop_reclaim_a)) | |
ef24f6dd | 814 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
815 | if (active) |
816 | vrele(vp); | |
38c46eee | 817 | |
ef24f6dd KM |
818 | /* |
819 | * Done with purge, notify sleepers in vget of the grim news. | |
820 | */ | |
821 | vp->v_flag &= ~VXLOCK; | |
822 | if (vp->v_flag & VXWANT) { | |
823 | vp->v_flag &= ~VXWANT; | |
824 | wakeup((caddr_t)vp); | |
825 | } | |
826 | } | |
827 | ||
ef62830d KM |
828 | /* |
829 | * Eliminate all activity associated with the requested vnode | |
830 | * and with all vnodes aliased to the requested vnode. | |
831 | */ | |
832 | void vgoneall(vp) | |
833 | register struct vnode *vp; | |
834 | { | |
7f7b7d89 | 835 | register struct vnode *vq; |
ef62830d | 836 | |
7a7b3a95 KM |
837 | if (vp->v_flag & VALIASED) { |
838 | /* | |
839 | * If a vgone (or vclean) is already in progress, | |
840 | * wait until it is done and return. | |
841 | */ | |
842 | if (vp->v_flag & VXLOCK) { | |
843 | vp->v_flag |= VXWANT; | |
844 | sleep((caddr_t)vp, PINOD); | |
845 | return; | |
846 | } | |
847 | /* | |
848 | * Ensure that vp will not be vgone'd while we | |
849 | * are eliminating its aliases. | |
850 | */ | |
851 | vp->v_flag |= VXLOCK; | |
852 | while (vp->v_flag & VALIASED) { | |
853 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
854 | if (vq->v_rdev != vp->v_rdev || | |
855 | vq->v_type != vp->v_type || vp == vq) | |
856 | continue; | |
857 | vgone(vq); | |
858 | break; | |
859 | } | |
ef62830d | 860 | } |
7a7b3a95 KM |
861 | /* |
862 | * Remove the lock so that vgone below will | |
863 | * really eliminate the vnode after which time | |
864 | * vgone will awaken any sleepers. | |
865 | */ | |
866 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
867 | } |
868 | vgone(vp); | |
869 | } | |
870 | ||
ef24f6dd KM |
871 | /* |
872 | * Eliminate all activity associated with a vnode | |
873 | * in preparation for reuse. | |
874 | */ | |
875 | void vgone(vp) | |
876 | register struct vnode *vp; | |
877 | { | |
7f7b7d89 | 878 | register struct vnode *vq; |
c0de8792 | 879 | struct vnode *vx; |
ef24f6dd | 880 | |
4f55e3ec KM |
881 | /* |
882 | * If a vgone (or vclean) is already in progress, | |
883 | * wait until it is done and return. | |
884 | */ | |
885 | if (vp->v_flag & VXLOCK) { | |
886 | vp->v_flag |= VXWANT; | |
887 | sleep((caddr_t)vp, PINOD); | |
888 | return; | |
889 | } | |
ef24f6dd KM |
890 | /* |
891 | * Clean out the filesystem specific data. | |
892 | */ | |
36ef03ec | 893 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
894 | /* |
895 | * Delete from old mount point vnode list, if on one. | |
896 | */ | |
897 | if (vp->v_mountb) { | |
898 | if (vq = vp->v_mountf) | |
899 | vq->v_mountb = vp->v_mountb; | |
900 | *vp->v_mountb = vq; | |
901 | vp->v_mountf = NULL; | |
902 | vp->v_mountb = NULL; | |
d10e9258 | 903 | vp->v_mount = NULL; |
ef24f6dd KM |
904 | } |
905 | /* | |
906 | * If special device, remove it from special device alias list. | |
907 | */ | |
908 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
909 | if (*vp->v_hashchain == vp) { |
910 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 911 | } else { |
7f7b7d89 | 912 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 913 | if (vq->v_specnext != vp) |
ef24f6dd | 914 | continue; |
c0de8792 | 915 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
916 | break; |
917 | } | |
c0de8792 | 918 | if (vq == NULL) |
ef24f6dd KM |
919 | panic("missing bdev"); |
920 | } | |
c0de8792 | 921 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 922 | vx = NULL; |
7f7b7d89 | 923 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
924 | if (vq->v_rdev != vp->v_rdev || |
925 | vq->v_type != vp->v_type) | |
c0de8792 | 926 | continue; |
4d1ee2eb CT |
927 | if (vx) |
928 | break; | |
c0de8792 KM |
929 | vx = vq; |
930 | } | |
4d1ee2eb | 931 | if (vx == NULL) |
c0de8792 | 932 | panic("missing alias"); |
4d1ee2eb | 933 | if (vq == NULL) |
c0de8792 KM |
934 | vx->v_flag &= ~VALIASED; |
935 | vp->v_flag &= ~VALIASED; | |
936 | } | |
937 | FREE(vp->v_specinfo, M_VNODE); | |
938 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
939 | } |
940 | /* | |
941 | * If it is on the freelist, move it to the head of the list. | |
942 | */ | |
943 | if (vp->v_freeb) { | |
944 | if (vq = vp->v_freef) | |
945 | vq->v_freeb = vp->v_freeb; | |
946 | else | |
947 | vfreet = vp->v_freeb; | |
948 | *vp->v_freeb = vq; | |
949 | vp->v_freef = vfreeh; | |
950 | vp->v_freeb = &vfreeh; | |
951 | vfreeh->v_freeb = &vp->v_freef; | |
952 | vfreeh = vp; | |
953 | } | |
2bae1875 | 954 | vp->v_type = VBAD; |
36d09cb1 | 955 | } |
ef62830d | 956 | |
2bcd6066 KM |
957 | /* |
958 | * Lookup a vnode by device number. | |
959 | */ | |
960 | vfinddev(dev, type, vpp) | |
961 | dev_t dev; | |
962 | enum vtype type; | |
963 | struct vnode **vpp; | |
964 | { | |
965 | register struct vnode *vp; | |
966 | ||
967 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
968 | if (dev != vp->v_rdev || type != vp->v_type) | |
969 | continue; | |
970 | *vpp = vp; | |
971 | return (0); | |
972 | } | |
973 | return (1); | |
974 | } | |
975 | ||
ef62830d KM |
976 | /* |
977 | * Calculate the total number of references to a special device. | |
978 | */ | |
979 | vcount(vp) | |
980 | register struct vnode *vp; | |
981 | { | |
7f7b7d89 | 982 | register struct vnode *vq; |
ef62830d KM |
983 | int count; |
984 | ||
985 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 986 | return (vp->v_usecount); |
ef62830d | 987 | loop: |
7f7b7d89 | 988 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 989 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
990 | continue; |
991 | /* | |
992 | * Alias, but not in use, so flush it out. | |
993 | */ | |
7f7b7d89 | 994 | if (vq->v_usecount == 0) { |
ef62830d KM |
995 | vgone(vq); |
996 | goto loop; | |
997 | } | |
7f7b7d89 | 998 | count += vq->v_usecount; |
ef62830d KM |
999 | } |
1000 | return (count); | |
1001 | } | |
0bf84b18 KM |
1002 | |
1003 | /* | |
1004 | * Print out a description of a vnode. | |
1005 | */ | |
1006 | static char *typename[] = | |
61f846a8 | 1007 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1008 | |
1009 | vprint(label, vp) | |
1010 | char *label; | |
1011 | register struct vnode *vp; | |
1012 | { | |
9342689a | 1013 | USES_VOP_PRINT; |
f2f730c6 | 1014 | char buf[64]; |
0bf84b18 KM |
1015 | |
1016 | if (label != NULL) | |
1017 | printf("%s: ", label); | |
65c3b3a8 KM |
1018 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1019 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1020 | vp->v_holdcnt); | |
f2f730c6 KM |
1021 | buf[0] = '\0'; |
1022 | if (vp->v_flag & VROOT) | |
1023 | strcat(buf, "|VROOT"); | |
1024 | if (vp->v_flag & VTEXT) | |
1025 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1026 | if (vp->v_flag & VSYSTEM) |
1027 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1028 | if (vp->v_flag & VXLOCK) |
1029 | strcat(buf, "|VXLOCK"); | |
1030 | if (vp->v_flag & VXWANT) | |
1031 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1032 | if (vp->v_flag & VBWAIT) |
1033 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1034 | if (vp->v_flag & VALIASED) |
1035 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1036 | if (buf[0] != '\0') |
1037 | printf(" flags (%s)", &buf[1]); | |
1038 | printf("\n\t"); | |
0bf84b18 KM |
1039 | VOP_PRINT(vp); |
1040 | } | |
985cbdd5 | 1041 | |
34c62e18 KM |
1042 | #ifdef DEBUG |
1043 | /* | |
1044 | * List all of the locked vnodes in the system. | |
1045 | * Called when debugging the kernel. | |
1046 | */ | |
1047 | printlockedvnodes() | |
1048 | { | |
9342689a | 1049 | USES_VOP_ISLOCKED; |
34c62e18 KM |
1050 | register struct mount *mp; |
1051 | register struct vnode *vp; | |
1052 | ||
1053 | printf("Locked vnodes\n"); | |
1054 | mp = rootfs; | |
1055 | do { | |
1056 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1057 | if (VOP_ISLOCKED(vp)) | |
1058 | vprint((char *)0, vp); | |
1059 | mp = mp->mnt_next; | |
1060 | } while (mp != rootfs); | |
1061 | } | |
1062 | #endif | |
1063 | ||
985cbdd5 MT |
1064 | int kinfo_vdebug = 1; |
1065 | int kinfo_vgetfailed; | |
1066 | #define KINFO_VNODESLOP 10 | |
1067 | /* | |
1068 | * Dump vnode list (via kinfo). | |
1069 | * Copyout address of vnode followed by vnode. | |
1070 | */ | |
aacc1bff | 1071 | /* ARGSUSED */ |
985cbdd5 | 1072 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1073 | int op; |
985cbdd5 | 1074 | char *where; |
aacc1bff | 1075 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1076 | { |
1077 | register struct mount *mp = rootfs; | |
36ef03ec | 1078 | struct mount *omp; |
985cbdd5 | 1079 | struct vnode *vp; |
985cbdd5 | 1080 | register char *bp = where, *savebp; |
5bf57294 | 1081 | char *ewhere; |
985cbdd5 MT |
1082 | int error; |
1083 | ||
1084 | #define VPTRSZ sizeof (struct vnode *) | |
1085 | #define VNODESZ sizeof (struct vnode) | |
1086 | if (where == NULL) { | |
1087 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1088 | return (0); | |
1089 | } | |
5bf57294 | 1090 | ewhere = where + *acopysize; |
985cbdd5 | 1091 | |
985cbdd5 | 1092 | do { |
36ef03ec | 1093 | if (vfs_busy(mp)) { |
54fb9dc2 | 1094 | mp = mp->mnt_next; |
36ef03ec KM |
1095 | continue; |
1096 | } | |
985cbdd5 MT |
1097 | savebp = bp; |
1098 | again: | |
4597dd33 | 1099 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1100 | /* |
1101 | * Check that the vp is still associated with | |
1102 | * this filesystem. RACE: could have been | |
1103 | * recycled onto the same filesystem. | |
1104 | */ | |
4597dd33 KM |
1105 | if (vp->v_mount != mp) { |
1106 | if (kinfo_vdebug) | |
1107 | printf("kinfo: vp changed\n"); | |
1108 | bp = savebp; | |
1109 | goto again; | |
1110 | } | |
985cbdd5 MT |
1111 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1112 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1113 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1114 | VNODESZ)))) |
985cbdd5 | 1115 | return (error); |
985cbdd5 | 1116 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1117 | } |
36ef03ec | 1118 | omp = mp; |
54fb9dc2 | 1119 | mp = mp->mnt_next; |
36ef03ec | 1120 | vfs_unbusy(omp); |
985cbdd5 MT |
1121 | } while (mp != rootfs); |
1122 | ||
1123 | *aneeded = bp - where; | |
1124 | if (bp > ewhere) | |
1125 | *acopysize = ewhere - where; | |
1126 | else | |
1127 | *acopysize = bp - where; | |
1128 | return (0); | |
1129 | } |