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 | * |
12079a9d | 7 | * @(#)vfs_subr.c 7.86 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
cb796a23 | 14 | #include <sys/param.h> |
917dc539 | 15 | #include <sys/systm.h> |
cb796a23 KB |
16 | #include <sys/proc.h> |
17 | #include <sys/mount.h> | |
18 | #include <sys/time.h> | |
19 | #include <sys/vnode.h> | |
807cc430 | 20 | #include <sys/stat.h> |
cb796a23 KB |
21 | #include <sys/namei.h> |
22 | #include <sys/ucred.h> | |
23 | #include <sys/buf.h> | |
24 | #include <sys/errno.h> | |
25 | #include <sys/malloc.h> | |
3c4390e8 | 26 | |
021de758 JSP |
27 | #include <miscfs/specfs/specdev.h> |
28 | ||
807cc430 KM |
29 | enum vtype iftovt_tab[16] = { |
30 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
31 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
32 | }; | |
33 | int vttoif_tab[9] = { | |
34 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
35 | S_IFSOCK, S_IFIFO, S_IFMT, | |
36 | }; | |
37 | ||
3c4390e8 KM |
38 | /* |
39 | * Remove a mount point from the list of mounted filesystems. | |
40 | * Unmount of the root is illegal. | |
41 | */ | |
42 | void | |
43 | vfs_remove(mp) | |
44 | register struct mount *mp; | |
45 | { | |
46 | ||
47 | if (mp == rootfs) | |
48 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
49 | mp->mnt_prev->mnt_next = mp->mnt_next; |
50 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
51 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
52 | vfs_unlock(mp); |
53 | } | |
54 | ||
55 | /* | |
56 | * Lock a filesystem. | |
57 | * Used to prevent access to it while mounting and unmounting. | |
58 | */ | |
59 | vfs_lock(mp) | |
60 | register struct mount *mp; | |
61 | { | |
62 | ||
54fb9dc2 KM |
63 | while(mp->mnt_flag & MNT_MLOCK) { |
64 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
65 | sleep((caddr_t)mp, PVFS); |
66 | } | |
54fb9dc2 | 67 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
68 | return (0); |
69 | } | |
70 | ||
71 | /* | |
72 | * Unlock a locked filesystem. | |
73 | * Panic if filesystem is not locked. | |
74 | */ | |
75 | void | |
76 | vfs_unlock(mp) | |
77 | register struct mount *mp; | |
78 | { | |
79 | ||
54fb9dc2 | 80 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 81 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
82 | mp->mnt_flag &= ~MNT_MLOCK; |
83 | if (mp->mnt_flag & MNT_MWAIT) { | |
84 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
85 | wakeup((caddr_t)mp); |
86 | } | |
87 | } | |
88 | ||
36ef03ec KM |
89 | /* |
90 | * Mark a mount point as busy. | |
91 | * Used to synchronize access and to delay unmounting. | |
92 | */ | |
93 | vfs_busy(mp) | |
94 | register struct mount *mp; | |
95 | { | |
96 | ||
54fb9dc2 KM |
97 | while(mp->mnt_flag & MNT_MPBUSY) { |
98 | mp->mnt_flag |= MNT_MPWANT; | |
99 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 100 | } |
d8b63609 KM |
101 | if (mp->mnt_flag & MNT_UNMOUNT) |
102 | return (1); | |
54fb9dc2 | 103 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
104 | return (0); |
105 | } | |
106 | ||
107 | /* | |
108 | * Free a busy filesystem. | |
109 | * Panic if filesystem is not busy. | |
110 | */ | |
36ef03ec KM |
111 | vfs_unbusy(mp) |
112 | register struct mount *mp; | |
113 | { | |
114 | ||
54fb9dc2 | 115 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 116 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
117 | mp->mnt_flag &= ~MNT_MPBUSY; |
118 | if (mp->mnt_flag & MNT_MPWANT) { | |
119 | mp->mnt_flag &= ~MNT_MPWANT; | |
120 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
121 | } |
122 | } | |
123 | ||
3c4390e8 KM |
124 | /* |
125 | * Lookup a mount point by filesystem identifier. | |
126 | */ | |
127 | struct mount * | |
128 | getvfs(fsid) | |
129 | fsid_t *fsid; | |
130 | { | |
131 | register struct mount *mp; | |
132 | ||
d713f801 KM |
133 | mp = rootfs; |
134 | do { | |
54fb9dc2 KM |
135 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
136 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 137 | return (mp); |
3c4390e8 | 138 | } |
54fb9dc2 | 139 | mp = mp->mnt_next; |
d713f801 KM |
140 | } while (mp != rootfs); |
141 | return ((struct mount *)0); | |
3c4390e8 KM |
142 | } |
143 | ||
917dc539 JSP |
144 | /* |
145 | * Get a new unique fsid | |
146 | */ | |
147 | void | |
148 | getnewfsid(mp, mtype) | |
149 | struct mount *mp; | |
150 | int mtype; | |
151 | { | |
152 | static u_short xxxfs_mntid; | |
153 | ||
154 | fsid_t tfsid; | |
155 | ||
156 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */ | |
157 | mp->mnt_stat.f_fsid.val[1] = mtype; | |
158 | if (xxxfs_mntid == 0) | |
159 | ++xxxfs_mntid; | |
160 | tfsid.val[0] = makedev(nblkdev, xxxfs_mntid); | |
161 | tfsid.val[1] = mtype; | |
17fd1cc7 JSP |
162 | if (rootfs) { |
163 | while (getvfs(&tfsid)) { | |
164 | tfsid.val[0]++; | |
165 | xxxfs_mntid++; | |
166 | } | |
917dc539 JSP |
167 | } |
168 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
169 | } | |
170 | ||
3c4390e8 KM |
171 | /* |
172 | * Set vnode attributes to VNOVAL | |
173 | */ | |
174 | void vattr_null(vap) | |
175 | register struct vattr *vap; | |
176 | { | |
177 | ||
178 | vap->va_type = VNON; | |
83504fd5 | 179 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 180 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
181 | vap->va_fsid = vap->va_fileid = |
182 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
183 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
184 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
185 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 186 | vap->va_flags = vap->va_gen = VNOVAL; |
3c4390e8 | 187 | } |
c60798ca | 188 | |
36d09cb1 KM |
189 | /* |
190 | * Routines having to do with the management of the vnode table. | |
191 | */ | |
dc998e72 | 192 | struct vnode *vfreeh, **vfreet = &vfreeh; |
9342689a | 193 | extern int (**dead_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 | 306 | int |
12079a9d | 307 | vinvalbuf(vp, flags, cred, p) |
76429560 | 308 | register struct vnode *vp; |
12079a9d | 309 | int flags; |
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 | |
12079a9d | 317 | if (flags & V_SAVE) { |
d024c2ce KM |
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 (;;) { |
12079a9d MS |
324 | if ((blist = vp->v_cleanblkhd) && flags & V_SAVEMETA) |
325 | while (blist && blist->b_lblkno < 0) | |
326 | blist = blist->b_blockf; | |
327 | if (!blist && (blist = vp->v_dirtyblkhd) && flags & V_SAVEMETA) | |
328 | while (blist && blist->b_lblkno < 0) | |
329 | blist = blist->b_blockf; | |
330 | if (!blist) | |
76429560 | 331 | break; |
12079a9d | 332 | |
76429560 KM |
333 | for (bp = blist; bp; bp = nbp) { |
334 | nbp = bp->b_blockf; | |
12079a9d MS |
335 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
336 | continue; | |
76429560 KM |
337 | s = splbio(); |
338 | if (bp->b_flags & B_BUSY) { | |
339 | bp->b_flags |= B_WANTED; | |
340 | sleep((caddr_t)bp, PRIBIO + 1); | |
341 | splx(s); | |
342 | break; | |
343 | } | |
344 | bremfree(bp); | |
345 | bp->b_flags |= B_BUSY; | |
346 | splx(s); | |
12079a9d | 347 | bp->b_flags |= B_INVAL; |
76429560 KM |
348 | brelse(bp); |
349 | } | |
350 | } | |
12079a9d | 351 | if (!(flags & V_SAVEMETA) && (vp->v_dirtyblkhd || vp->v_cleanblkhd)) |
76429560 | 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 | { | |
492 | register struct vnode *vp; | |
c0de8792 | 493 | struct vnode **vpp; |
ef24f6dd KM |
494 | |
495 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 496 | return (NULLVP); |
c0de8792 KM |
497 | |
498 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 499 | loop: |
c0de8792 KM |
500 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
501 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 502 | continue; |
c0de8792 KM |
503 | /* |
504 | * Alias, but not in use, so flush it out. | |
505 | */ | |
7f7b7d89 | 506 | if (vp->v_usecount == 0) { |
c0de8792 KM |
507 | vgone(vp); |
508 | goto loop; | |
509 | } | |
ef62830d KM |
510 | if (vget(vp)) |
511 | goto loop; | |
ef24f6dd KM |
512 | break; |
513 | } | |
c0de8792 | 514 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
515 | MALLOC(nvp->v_specinfo, struct specinfo *, |
516 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
517 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 518 | nvp->v_hashchain = vpp; |
c0de8792 | 519 | nvp->v_specnext = *vpp; |
2c957a90 | 520 | nvp->v_specflags = 0; |
c0de8792 | 521 | *vpp = nvp; |
40452d5e KM |
522 | if (vp != NULL) { |
523 | nvp->v_flag |= VALIASED; | |
524 | vp->v_flag |= VALIASED; | |
525 | vput(vp); | |
526 | } | |
54fb9dc2 | 527 | return (NULLVP); |
ef24f6dd | 528 | } |
2bae1875 KM |
529 | VOP_UNLOCK(vp); |
530 | vclean(vp, 0); | |
ef24f6dd KM |
531 | vp->v_op = nvp->v_op; |
532 | vp->v_tag = nvp->v_tag; | |
533 | nvp->v_type = VNON; | |
534 | insmntque(vp, mp); | |
535 | return (vp); | |
536 | } | |
537 | ||
538 | /* | |
539 | * Grab a particular vnode from the free list, increment its | |
540 | * reference count and lock it. The vnode lock bit is set the | |
541 | * vnode is being eliminated in vgone. The process is awakened | |
542 | * when the transition is completed, and an error returned to | |
543 | * indicate that the vnode is no longer usable (possibly having | |
544 | * been changed to a new file system type). | |
36d09cb1 KM |
545 | */ |
546 | vget(vp) | |
547 | register struct vnode *vp; | |
548 | { | |
549 | register struct vnode *vq; | |
550 | ||
ef24f6dd KM |
551 | if (vp->v_flag & VXLOCK) { |
552 | vp->v_flag |= VXWANT; | |
553 | sleep((caddr_t)vp, PINOD); | |
554 | return (1); | |
555 | } | |
7f7b7d89 | 556 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
557 | if (vq = vp->v_freef) |
558 | vq->v_freeb = vp->v_freeb; | |
559 | else | |
560 | vfreet = vp->v_freeb; | |
561 | *vp->v_freeb = vq; | |
562 | vp->v_freef = NULL; | |
563 | vp->v_freeb = NULL; | |
564 | } | |
36d09cb1 | 565 | VREF(vp); |
ef24f6dd KM |
566 | VOP_LOCK(vp); |
567 | return (0); | |
36d09cb1 KM |
568 | } |
569 | ||
d32390ea KM |
570 | int bug_refs = 0; |
571 | ||
36d09cb1 KM |
572 | /* |
573 | * Vnode reference, just increment the count | |
574 | */ | |
575 | void vref(vp) | |
576 | struct vnode *vp; | |
577 | { | |
578 | ||
7f7b7d89 | 579 | vp->v_usecount++; |
d32390ea KM |
580 | if (vp->v_type != VBLK && curproc) |
581 | curproc->p_spare[0]++; | |
582 | if (bug_refs) | |
583 | vprint("vref: "); | |
36d09cb1 KM |
584 | } |
585 | ||
586 | /* | |
587 | * vput(), just unlock and vrele() | |
588 | */ | |
589 | void vput(vp) | |
590 | register struct vnode *vp; | |
591 | { | |
4d1ee2eb | 592 | |
36d09cb1 KM |
593 | VOP_UNLOCK(vp); |
594 | vrele(vp); | |
595 | } | |
596 | ||
597 | /* | |
598 | * Vnode release. | |
599 | * If count drops to zero, call inactive routine and return to freelist. | |
600 | */ | |
601 | void vrele(vp) | |
602 | register struct vnode *vp; | |
603 | { | |
604 | ||
65c3b3a8 | 605 | #ifdef DIAGNOSTIC |
36d09cb1 | 606 | if (vp == NULL) |
ef24f6dd | 607 | panic("vrele: null vp"); |
65c3b3a8 | 608 | #endif |
7f7b7d89 | 609 | vp->v_usecount--; |
d32390ea KM |
610 | if (vp->v_type != VBLK && curproc) |
611 | curproc->p_spare[0]--; | |
612 | if (bug_refs) | |
613 | vprint("vref: "); | |
7f7b7d89 | 614 | if (vp->v_usecount > 0) |
36d09cb1 | 615 | return; |
65c3b3a8 KM |
616 | #ifdef DIAGNOSTIC |
617 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
618 | vprint("vrele: bad ref count", vp); | |
619 | panic("vrele: ref cnt"); | |
620 | } | |
621 | #endif | |
dc998e72 KM |
622 | /* |
623 | * insert at tail of LRU list | |
624 | */ | |
625 | *vfreet = vp; | |
626 | vp->v_freeb = vfreet; | |
ef24f6dd KM |
627 | vp->v_freef = NULL; |
628 | vfreet = &vp->v_freef; | |
d024c2ce | 629 | VOP_INACTIVE(vp); |
ef24f6dd KM |
630 | } |
631 | ||
7f7b7d89 KM |
632 | /* |
633 | * Page or buffer structure gets a reference. | |
634 | */ | |
451df175 | 635 | void vhold(vp) |
7f7b7d89 KM |
636 | register struct vnode *vp; |
637 | { | |
638 | ||
639 | vp->v_holdcnt++; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Page or buffer structure frees a reference. | |
644 | */ | |
451df175 | 645 | void holdrele(vp) |
7f7b7d89 KM |
646 | register struct vnode *vp; |
647 | { | |
648 | ||
649 | if (vp->v_holdcnt <= 0) | |
650 | panic("holdrele: holdcnt"); | |
651 | vp->v_holdcnt--; | |
652 | } | |
653 | ||
f0556f86 KM |
654 | /* |
655 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
656 | * | |
657 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
658 | * return error if any are found (nb: this is a user error, not a | |
659 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
660 | * that are found. | |
661 | */ | |
662 | int busyprt = 0; /* patch to print out busy vnodes */ | |
663 | ||
664 | vflush(mp, skipvp, flags) | |
665 | struct mount *mp; | |
666 | struct vnode *skipvp; | |
667 | int flags; | |
668 | { | |
669 | register struct vnode *vp, *nvp; | |
670 | int busy = 0; | |
671 | ||
54fb9dc2 | 672 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 673 | panic("vflush: not busy"); |
4597dd33 | 674 | loop: |
54fb9dc2 | 675 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
676 | if (vp->v_mount != mp) |
677 | goto loop; | |
f0556f86 KM |
678 | nvp = vp->v_mountf; |
679 | /* | |
680 | * Skip over a selected vnode. | |
f0556f86 KM |
681 | */ |
682 | if (vp == skipvp) | |
683 | continue; | |
36ef03ec KM |
684 | /* |
685 | * Skip over a vnodes marked VSYSTEM. | |
686 | */ | |
687 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
688 | continue; | |
f0556f86 | 689 | /* |
7f7b7d89 | 690 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
691 | * out the vnode data structures and we are done. |
692 | */ | |
7f7b7d89 | 693 | if (vp->v_usecount == 0) { |
f0556f86 KM |
694 | vgone(vp); |
695 | continue; | |
696 | } | |
697 | /* | |
698 | * For block or character devices, revert to an | |
699 | * anonymous device. For all other files, just kill them. | |
700 | */ | |
36ef03ec | 701 | if (flags & FORCECLOSE) { |
f0556f86 KM |
702 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
703 | vgone(vp); | |
704 | } else { | |
705 | vclean(vp, 0); | |
9342689a | 706 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
707 | insmntque(vp, (struct mount *)0); |
708 | } | |
709 | continue; | |
710 | } | |
711 | if (busyprt) | |
0bf84b18 | 712 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
713 | busy++; |
714 | } | |
715 | if (busy) | |
716 | return (EBUSY); | |
717 | return (0); | |
718 | } | |
719 | ||
ef24f6dd KM |
720 | /* |
721 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 722 | */ |
ecf75a7d KM |
723 | void |
724 | vclean(vp, flags) | |
ef24f6dd | 725 | register struct vnode *vp; |
aacc1bff | 726 | int flags; |
ef24f6dd | 727 | { |
4a6391bf KM |
728 | struct vop_inactive_args vop_inactive_a; |
729 | struct vop_reclaim_args vop_reclaim_a; | |
730 | struct vop_unlock_args vop_unlock_a; | |
731 | struct vop_close_args vop_close_a; | |
38c46eee | 732 | int (**origops)(); |
2bae1875 | 733 | int active; |
ef24f6dd | 734 | |
2bae1875 KM |
735 | /* |
736 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
737 | * If so we have to reference it before we clean it out |
738 | * so that its count cannot fall to zero and generate a | |
739 | * race against ourselves to recycle it. | |
2bae1875 | 740 | */ |
7f7b7d89 | 741 | if (active = vp->v_usecount) |
2bae1875 | 742 | VREF(vp); |
2bae1875 KM |
743 | /* |
744 | * Prevent the vnode from being recycled or | |
745 | * brought into use while we clean it out. | |
746 | */ | |
0bf84b18 KM |
747 | if (vp->v_flag & VXLOCK) |
748 | panic("vclean: deadlock"); | |
ef24f6dd | 749 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
750 | /* |
751 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
752 | * have the object locked while it cleans it out. The VOP_LOCK | |
753 | * ensures that the VOP_INACTIVE routine is done with its work. | |
754 | * For active vnodes, it ensures that no other activity can | |
755 | * occur while the buffer list is being cleaned out. | |
756 | */ | |
757 | VOP_LOCK(vp); | |
36ef03ec | 758 | if (flags & DOCLOSE) |
d024c2ce | 759 | vinvalbuf(vp, 1, NOCRED, NULL); |
ef24f6dd KM |
760 | /* |
761 | * Prevent any further operations on the vnode from | |
762 | * being passed through to the old file system. | |
763 | */ | |
764 | origops = vp->v_op; | |
9342689a | 765 | vp->v_op = dead_vnodeop_p; |
ef24f6dd KM |
766 | vp->v_tag = VT_NON; |
767 | /* | |
2bae1875 KM |
768 | * If purging an active vnode, it must be unlocked, closed, |
769 | * and deactivated before being reclaimed. | |
ef24f6dd | 770 | */ |
38c46eee JH |
771 | vop_unlock_a.a_desc = VDESC(vop_unlock); |
772 | vop_unlock_a.a_vp = vp; | |
773 | VOCALL(origops,VOFFSET(vop_unlock),&vop_unlock_a); | |
2bae1875 | 774 | if (active) { |
38c46eee JH |
775 | /* |
776 | * Note: these next two calls imply | |
777 | * that vop_close and vop_inactive implementations | |
778 | * cannot count on the ops vector being correctly | |
779 | * set. | |
780 | */ | |
781 | if (flags & DOCLOSE) { | |
782 | vop_close_a.a_desc = VDESC(vop_close); | |
783 | vop_close_a.a_vp = vp; | |
784 | vop_close_a.a_fflag = IO_NDELAY; | |
d024c2ce | 785 | vop_close_a.a_p = NULL; |
38c46eee JH |
786 | VOCALL(origops,VOFFSET(vop_close),&vop_close_a); |
787 | }; | |
788 | vop_inactive_a.a_desc = VDESC(vop_inactive); | |
789 | vop_inactive_a.a_vp = vp; | |
38c46eee | 790 | VOCALL(origops,VOFFSET(vop_inactive),&vop_inactive_a); |
ef24f6dd KM |
791 | } |
792 | /* | |
793 | * Reclaim the vnode. | |
794 | */ | |
38c46eee JH |
795 | /* |
796 | * Emulate VOP_RECLAIM. | |
797 | */ | |
798 | vop_reclaim_a.a_desc = VDESC(vop_reclaim); | |
799 | vop_reclaim_a.a_vp = vp; | |
800 | if (VOCALL(origops,VOFFSET(vop_reclaim),&vop_reclaim_a)) | |
ef24f6dd | 801 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
802 | if (active) |
803 | vrele(vp); | |
38c46eee | 804 | |
ef24f6dd KM |
805 | /* |
806 | * Done with purge, notify sleepers in vget of the grim news. | |
807 | */ | |
808 | vp->v_flag &= ~VXLOCK; | |
809 | if (vp->v_flag & VXWANT) { | |
810 | vp->v_flag &= ~VXWANT; | |
811 | wakeup((caddr_t)vp); | |
812 | } | |
813 | } | |
814 | ||
ef62830d KM |
815 | /* |
816 | * Eliminate all activity associated with the requested vnode | |
817 | * and with all vnodes aliased to the requested vnode. | |
818 | */ | |
819 | void vgoneall(vp) | |
820 | register struct vnode *vp; | |
821 | { | |
7f7b7d89 | 822 | register struct vnode *vq; |
ef62830d | 823 | |
7a7b3a95 KM |
824 | if (vp->v_flag & VALIASED) { |
825 | /* | |
826 | * If a vgone (or vclean) is already in progress, | |
827 | * wait until it is done and return. | |
828 | */ | |
829 | if (vp->v_flag & VXLOCK) { | |
830 | vp->v_flag |= VXWANT; | |
831 | sleep((caddr_t)vp, PINOD); | |
832 | return; | |
833 | } | |
834 | /* | |
835 | * Ensure that vp will not be vgone'd while we | |
836 | * are eliminating its aliases. | |
837 | */ | |
838 | vp->v_flag |= VXLOCK; | |
839 | while (vp->v_flag & VALIASED) { | |
840 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
841 | if (vq->v_rdev != vp->v_rdev || | |
842 | vq->v_type != vp->v_type || vp == vq) | |
843 | continue; | |
844 | vgone(vq); | |
845 | break; | |
846 | } | |
ef62830d | 847 | } |
7a7b3a95 KM |
848 | /* |
849 | * Remove the lock so that vgone below will | |
850 | * really eliminate the vnode after which time | |
851 | * vgone will awaken any sleepers. | |
852 | */ | |
853 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
854 | } |
855 | vgone(vp); | |
856 | } | |
857 | ||
ef24f6dd KM |
858 | /* |
859 | * Eliminate all activity associated with a vnode | |
860 | * in preparation for reuse. | |
861 | */ | |
862 | void vgone(vp) | |
863 | register struct vnode *vp; | |
864 | { | |
7f7b7d89 | 865 | register struct vnode *vq; |
c0de8792 | 866 | struct vnode *vx; |
ef24f6dd | 867 | |
4f55e3ec KM |
868 | /* |
869 | * If a vgone (or vclean) is already in progress, | |
870 | * wait until it is done and return. | |
871 | */ | |
872 | if (vp->v_flag & VXLOCK) { | |
873 | vp->v_flag |= VXWANT; | |
874 | sleep((caddr_t)vp, PINOD); | |
875 | return; | |
876 | } | |
ef24f6dd KM |
877 | /* |
878 | * Clean out the filesystem specific data. | |
879 | */ | |
36ef03ec | 880 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
881 | /* |
882 | * Delete from old mount point vnode list, if on one. | |
883 | */ | |
884 | if (vp->v_mountb) { | |
885 | if (vq = vp->v_mountf) | |
886 | vq->v_mountb = vp->v_mountb; | |
887 | *vp->v_mountb = vq; | |
888 | vp->v_mountf = NULL; | |
889 | vp->v_mountb = NULL; | |
d10e9258 | 890 | vp->v_mount = NULL; |
ef24f6dd KM |
891 | } |
892 | /* | |
893 | * If special device, remove it from special device alias list. | |
894 | */ | |
895 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
896 | if (*vp->v_hashchain == vp) { |
897 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 898 | } else { |
7f7b7d89 | 899 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 900 | if (vq->v_specnext != vp) |
ef24f6dd | 901 | continue; |
c0de8792 | 902 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
903 | break; |
904 | } | |
c0de8792 | 905 | if (vq == NULL) |
ef24f6dd KM |
906 | panic("missing bdev"); |
907 | } | |
c0de8792 | 908 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 909 | vx = NULL; |
7f7b7d89 | 910 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
911 | if (vq->v_rdev != vp->v_rdev || |
912 | vq->v_type != vp->v_type) | |
c0de8792 | 913 | continue; |
4d1ee2eb CT |
914 | if (vx) |
915 | break; | |
c0de8792 KM |
916 | vx = vq; |
917 | } | |
4d1ee2eb | 918 | if (vx == NULL) |
c0de8792 | 919 | panic("missing alias"); |
4d1ee2eb | 920 | if (vq == NULL) |
c0de8792 KM |
921 | vx->v_flag &= ~VALIASED; |
922 | vp->v_flag &= ~VALIASED; | |
923 | } | |
924 | FREE(vp->v_specinfo, M_VNODE); | |
925 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
926 | } |
927 | /* | |
928 | * If it is on the freelist, move it to the head of the list. | |
929 | */ | |
930 | if (vp->v_freeb) { | |
931 | if (vq = vp->v_freef) | |
932 | vq->v_freeb = vp->v_freeb; | |
933 | else | |
934 | vfreet = vp->v_freeb; | |
935 | *vp->v_freeb = vq; | |
936 | vp->v_freef = vfreeh; | |
937 | vp->v_freeb = &vfreeh; | |
938 | vfreeh->v_freeb = &vp->v_freef; | |
939 | vfreeh = vp; | |
940 | } | |
2bae1875 | 941 | vp->v_type = VBAD; |
36d09cb1 | 942 | } |
ef62830d | 943 | |
2bcd6066 KM |
944 | /* |
945 | * Lookup a vnode by device number. | |
946 | */ | |
947 | vfinddev(dev, type, vpp) | |
948 | dev_t dev; | |
949 | enum vtype type; | |
950 | struct vnode **vpp; | |
951 | { | |
952 | register struct vnode *vp; | |
953 | ||
954 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
955 | if (dev != vp->v_rdev || type != vp->v_type) | |
956 | continue; | |
957 | *vpp = vp; | |
958 | return (0); | |
959 | } | |
960 | return (1); | |
961 | } | |
962 | ||
ef62830d KM |
963 | /* |
964 | * Calculate the total number of references to a special device. | |
965 | */ | |
966 | vcount(vp) | |
967 | register struct vnode *vp; | |
968 | { | |
7f7b7d89 | 969 | register struct vnode *vq; |
ef62830d KM |
970 | int count; |
971 | ||
972 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 973 | return (vp->v_usecount); |
ef62830d | 974 | loop: |
7f7b7d89 | 975 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 976 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
977 | continue; |
978 | /* | |
979 | * Alias, but not in use, so flush it out. | |
980 | */ | |
7f7b7d89 | 981 | if (vq->v_usecount == 0) { |
ef62830d KM |
982 | vgone(vq); |
983 | goto loop; | |
984 | } | |
7f7b7d89 | 985 | count += vq->v_usecount; |
ef62830d KM |
986 | } |
987 | return (count); | |
988 | } | |
0bf84b18 KM |
989 | |
990 | /* | |
991 | * Print out a description of a vnode. | |
992 | */ | |
993 | static char *typename[] = | |
61f846a8 | 994 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
995 | |
996 | vprint(label, vp) | |
997 | char *label; | |
998 | register struct vnode *vp; | |
999 | { | |
f2f730c6 | 1000 | char buf[64]; |
0bf84b18 KM |
1001 | |
1002 | if (label != NULL) | |
1003 | printf("%s: ", label); | |
65c3b3a8 KM |
1004 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1005 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1006 | vp->v_holdcnt); | |
f2f730c6 KM |
1007 | buf[0] = '\0'; |
1008 | if (vp->v_flag & VROOT) | |
1009 | strcat(buf, "|VROOT"); | |
1010 | if (vp->v_flag & VTEXT) | |
1011 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1012 | if (vp->v_flag & VSYSTEM) |
1013 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1014 | if (vp->v_flag & VXLOCK) |
1015 | strcat(buf, "|VXLOCK"); | |
1016 | if (vp->v_flag & VXWANT) | |
1017 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1018 | if (vp->v_flag & VBWAIT) |
1019 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1020 | if (vp->v_flag & VALIASED) |
1021 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1022 | if (buf[0] != '\0') |
1023 | printf(" flags (%s)", &buf[1]); | |
1024 | printf("\n\t"); | |
0bf84b18 KM |
1025 | VOP_PRINT(vp); |
1026 | } | |
985cbdd5 | 1027 | |
34c62e18 KM |
1028 | #ifdef DEBUG |
1029 | /* | |
1030 | * List all of the locked vnodes in the system. | |
1031 | * Called when debugging the kernel. | |
1032 | */ | |
1033 | printlockedvnodes() | |
1034 | { | |
1035 | register struct mount *mp; | |
1036 | register struct vnode *vp; | |
1037 | ||
1038 | printf("Locked vnodes\n"); | |
1039 | mp = rootfs; | |
1040 | do { | |
1041 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1042 | if (VOP_ISLOCKED(vp)) | |
1043 | vprint((char *)0, vp); | |
1044 | mp = mp->mnt_next; | |
1045 | } while (mp != rootfs); | |
1046 | } | |
1047 | #endif | |
1048 | ||
985cbdd5 MT |
1049 | int kinfo_vdebug = 1; |
1050 | int kinfo_vgetfailed; | |
1051 | #define KINFO_VNODESLOP 10 | |
1052 | /* | |
1053 | * Dump vnode list (via kinfo). | |
1054 | * Copyout address of vnode followed by vnode. | |
1055 | */ | |
aacc1bff | 1056 | /* ARGSUSED */ |
985cbdd5 | 1057 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1058 | int op; |
985cbdd5 | 1059 | char *where; |
aacc1bff | 1060 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1061 | { |
1062 | register struct mount *mp = rootfs; | |
36ef03ec | 1063 | struct mount *omp; |
985cbdd5 | 1064 | struct vnode *vp; |
985cbdd5 | 1065 | register char *bp = where, *savebp; |
5bf57294 | 1066 | char *ewhere; |
985cbdd5 MT |
1067 | int error; |
1068 | ||
1069 | #define VPTRSZ sizeof (struct vnode *) | |
1070 | #define VNODESZ sizeof (struct vnode) | |
1071 | if (where == NULL) { | |
1072 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1073 | return (0); | |
1074 | } | |
5bf57294 | 1075 | ewhere = where + *acopysize; |
985cbdd5 | 1076 | |
985cbdd5 | 1077 | do { |
36ef03ec | 1078 | if (vfs_busy(mp)) { |
54fb9dc2 | 1079 | mp = mp->mnt_next; |
36ef03ec KM |
1080 | continue; |
1081 | } | |
985cbdd5 MT |
1082 | savebp = bp; |
1083 | again: | |
4597dd33 | 1084 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1085 | /* |
1086 | * Check that the vp is still associated with | |
1087 | * this filesystem. RACE: could have been | |
1088 | * recycled onto the same filesystem. | |
1089 | */ | |
4597dd33 KM |
1090 | if (vp->v_mount != mp) { |
1091 | if (kinfo_vdebug) | |
1092 | printf("kinfo: vp changed\n"); | |
1093 | bp = savebp; | |
1094 | goto again; | |
1095 | } | |
985cbdd5 MT |
1096 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1097 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1098 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1099 | VNODESZ)))) |
985cbdd5 | 1100 | return (error); |
985cbdd5 | 1101 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1102 | } |
36ef03ec | 1103 | omp = mp; |
54fb9dc2 | 1104 | mp = mp->mnt_next; |
36ef03ec | 1105 | vfs_unbusy(omp); |
985cbdd5 MT |
1106 | } while (mp != rootfs); |
1107 | ||
1108 | *aneeded = bp - where; | |
1109 | if (bp > ewhere) | |
1110 | *acopysize = ewhere - where; | |
1111 | else | |
1112 | *acopysize = bp - where; | |
1113 | return (0); | |
1114 | } |