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 | * |
76429560 | 7 | * @(#)vfs_subr.c 7.54 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
14 | #include "param.h" | |
c099667a | 15 | #include "proc.h" |
3c4390e8 KM |
16 | #include "mount.h" |
17 | #include "time.h" | |
18 | #include "vnode.h" | |
0f93ba7b | 19 | #include "specdev.h" |
c60798ca KM |
20 | #include "namei.h" |
21 | #include "ucred.h" | |
76429560 | 22 | #include "buf.h" |
3c4390e8 | 23 | #include "errno.h" |
ef24f6dd | 24 | #include "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; | |
140 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = | |
141 | vap->va_fsid = vap->va_fileid = vap->va_size = | |
8fae943a KM |
142 | vap->va_size_rsv = vap->va_blocksize = vap->va_rdev = |
143 | vap->va_bytes = vap->va_bytes_rsv = | |
3c4390e8 KM |
144 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
145 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
146 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
147 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 148 | } |
c60798ca KM |
149 | |
150 | /* | |
151 | * Initialize a nameidata structure | |
152 | */ | |
153 | ndinit(ndp) | |
154 | register struct nameidata *ndp; | |
155 | { | |
156 | ||
157 | bzero((caddr_t)ndp, sizeof(struct nameidata)); | |
158 | ndp->ni_iov = &ndp->ni_nd.nd_iovec; | |
159 | ndp->ni_iovcnt = 1; | |
160 | ndp->ni_base = (caddr_t)&ndp->ni_dent; | |
161 | ndp->ni_rw = UIO_WRITE; | |
4dbe3531 | 162 | ndp->ni_uioseg = UIO_SYSSPACE; |
c60798ca KM |
163 | } |
164 | ||
165 | /* | |
166 | * Duplicate a nameidata structure | |
167 | */ | |
168 | nddup(ndp, newndp) | |
169 | register struct nameidata *ndp, *newndp; | |
170 | { | |
171 | ||
172 | ndinit(newndp); | |
c60798ca KM |
173 | newndp->ni_cred = ndp->ni_cred; |
174 | crhold(newndp->ni_cred); | |
175 | } | |
176 | ||
177 | /* | |
178 | * Release a nameidata structure | |
179 | */ | |
180 | ndrele(ndp) | |
181 | register struct nameidata *ndp; | |
182 | { | |
183 | ||
c60798ca KM |
184 | crfree(ndp->ni_cred); |
185 | } | |
36d09cb1 KM |
186 | |
187 | /* | |
188 | * Routines having to do with the management of the vnode table. | |
189 | */ | |
190 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 191 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 192 | extern void vclean(); |
1a80f56e | 193 | long numvnodes; |
d3664d8f | 194 | struct vattr va_null; |
c0de8792 | 195 | |
36d09cb1 | 196 | /* |
ef24f6dd | 197 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 198 | */ |
ef24f6dd | 199 | vfsinit() |
36d09cb1 | 200 | { |
ef24f6dd | 201 | struct vfsops **vfsp; |
36d09cb1 | 202 | |
ef24f6dd KM |
203 | /* |
204 | * Initialize the vnode name cache | |
205 | */ | |
206 | nchinit(); | |
207 | /* | |
208 | * Initialize each file system type. | |
209 | */ | |
d3664d8f | 210 | vattr_null(&va_null); |
ef24f6dd KM |
211 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
212 | if (*vfsp == NULL) | |
213 | continue; | |
214 | (*(*vfsp)->vfs_init)(); | |
215 | } | |
36d09cb1 KM |
216 | } |
217 | ||
218 | /* | |
219 | * Return the next vnode from the free list. | |
220 | */ | |
221 | getnewvnode(tag, mp, vops, vpp) | |
222 | enum vtagtype tag; | |
223 | struct mount *mp; | |
224 | struct vnodeops *vops; | |
225 | struct vnode **vpp; | |
226 | { | |
227 | register struct vnode *vp, *vq; | |
228 | ||
1a80f56e | 229 | if (numvnodes < desiredvnodes) { |
aacc1bff KM |
230 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
231 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
232 | bzero((char *)vp, sizeof *vp); |
233 | numvnodes++; | |
234 | } else { | |
235 | if ((vp = vfreeh) == NULL) { | |
236 | tablefull("vnode"); | |
237 | *vpp = 0; | |
238 | return (ENFILE); | |
239 | } | |
240 | if (vp->v_usecount) | |
241 | panic("free vnode isn't"); | |
242 | if (vq = vp->v_freef) | |
243 | vq->v_freeb = &vfreeh; | |
244 | else | |
245 | vfreet = &vfreeh; | |
246 | vfreeh = vq; | |
247 | vp->v_freef = NULL; | |
248 | vp->v_freeb = NULL; | |
249 | if (vp->v_type != VBAD) | |
250 | vgone(vp); | |
251 | vp->v_flag = 0; | |
1a80f56e KM |
252 | vp->v_lastr = 0; |
253 | vp->v_socket = 0; | |
36d09cb1 | 254 | } |
b027498b | 255 | vp->v_type = VNON; |
36d09cb1 KM |
256 | cache_purge(vp); |
257 | vp->v_tag = tag; | |
ef24f6dd | 258 | vp->v_op = vops; |
36d09cb1 KM |
259 | insmntque(vp, mp); |
260 | VREF(vp); | |
261 | *vpp = vp; | |
262 | return (0); | |
263 | } | |
264 | ||
265 | /* | |
266 | * Move a vnode from one mount queue to another. | |
267 | */ | |
268 | insmntque(vp, mp) | |
269 | register struct vnode *vp; | |
270 | register struct mount *mp; | |
271 | { | |
272 | struct vnode *vq; | |
273 | ||
274 | /* | |
275 | * Delete from old mount point vnode list, if on one. | |
276 | */ | |
277 | if (vp->v_mountb) { | |
278 | if (vq = vp->v_mountf) | |
279 | vq->v_mountb = vp->v_mountb; | |
280 | *vp->v_mountb = vq; | |
281 | } | |
282 | /* | |
283 | * Insert into list of vnodes for the new mount point, if available. | |
284 | */ | |
a45ff315 | 285 | vp->v_mount = mp; |
36d09cb1 KM |
286 | if (mp == NULL) { |
287 | vp->v_mountf = NULL; | |
288 | vp->v_mountb = NULL; | |
289 | return; | |
290 | } | |
54fb9dc2 KM |
291 | if (mp->mnt_mounth) { |
292 | vp->v_mountf = mp->mnt_mounth; | |
293 | vp->v_mountb = &mp->mnt_mounth; | |
294 | mp->mnt_mounth->v_mountb = &vp->v_mountf; | |
295 | mp->mnt_mounth = vp; | |
36d09cb1 | 296 | } else { |
54fb9dc2 KM |
297 | mp->mnt_mounth = vp; |
298 | vp->v_mountb = &mp->mnt_mounth; | |
36d09cb1 KM |
299 | vp->v_mountf = NULL; |
300 | } | |
301 | } | |
302 | ||
76429560 KM |
303 | /* |
304 | * Make sure all write-behind blocks associated | |
305 | * with mount point are flushed out (from sync). | |
306 | */ | |
307 | mntflushbuf(mountp, flags) | |
308 | struct mount *mountp; | |
309 | int flags; | |
310 | { | |
311 | register struct vnode *vp; | |
312 | ||
313 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
314 | panic("mntflushbuf: not busy"); | |
315 | loop: | |
316 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
317 | if (VOP_ISLOCKED(vp)) | |
318 | continue; | |
319 | if (vget(vp)) | |
320 | goto loop; | |
321 | vflushbuf(vp, flags); | |
322 | vput(vp); | |
323 | if (vp->v_mount != mountp) | |
324 | goto loop; | |
325 | } | |
326 | } | |
327 | ||
328 | /* | |
329 | * Flush all dirty buffers associated with a vnode. | |
330 | */ | |
331 | vflushbuf(vp, flags) | |
332 | register struct vnode *vp; | |
333 | int flags; | |
334 | { | |
335 | register struct buf *bp; | |
336 | struct buf *nbp; | |
337 | int s; | |
338 | ||
339 | loop: | |
340 | s = splbio(); | |
341 | for (bp = vp->v_dirtyblkhd; bp; bp = nbp) { | |
342 | nbp = bp->b_blockf; | |
343 | if ((bp->b_flags & B_BUSY)) | |
344 | continue; | |
345 | if ((bp->b_flags & B_DELWRI) == 0) | |
346 | panic("vflushbuf: not dirty"); | |
347 | bremfree(bp); | |
348 | bp->b_flags |= B_BUSY; | |
349 | splx(s); | |
350 | /* | |
351 | * Wait for I/O associated with indirect blocks to complete, | |
352 | * since there is no way to quickly wait for them below. | |
353 | * NB: This is really specific to ufs, but is done here | |
354 | * as it is easier and quicker. | |
355 | */ | |
356 | if (bp->b_vp == vp || (flags & B_SYNC) == 0) { | |
357 | (void) bawrite(bp); | |
358 | s = splbio(); | |
359 | } else { | |
360 | (void) bwrite(bp); | |
361 | goto loop; | |
362 | } | |
363 | } | |
364 | splx(s); | |
365 | if ((flags & B_SYNC) == 0) | |
366 | return; | |
367 | s = splbio(); | |
368 | while (vp->v_numoutput) { | |
369 | vp->v_flag |= VBWAIT; | |
370 | sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1); | |
371 | } | |
372 | splx(s); | |
373 | if (vp->v_dirtyblkhd) { | |
374 | vprint("vflushbuf: dirty", vp); | |
375 | goto loop; | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * Update outstanding I/O count and do wakeup if requested. | |
381 | */ | |
382 | vwakeup(bp) | |
383 | register struct buf *bp; | |
384 | { | |
385 | register struct vnode *vp; | |
386 | ||
387 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
388 | if (vp = bp->b_vp) { | |
389 | vp->v_numoutput--; | |
390 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
391 | if (vp->v_numoutput < 0) | |
392 | panic("vwakeup: neg numoutput"); | |
393 | vp->v_flag &= ~VBWAIT; | |
394 | wakeup((caddr_t)&vp->v_numoutput); | |
395 | } | |
396 | } | |
397 | } | |
398 | ||
399 | /* | |
400 | * Invalidate in core blocks belonging to closed or umounted filesystem | |
401 | * | |
402 | * Go through the list of vnodes associated with the file system; | |
403 | * for each vnode invalidate any buffers that it holds. Normally | |
404 | * this routine is preceeded by a bflush call, so that on a quiescent | |
405 | * filesystem there will be no dirty buffers when we are done. Binval | |
406 | * returns the count of dirty buffers when it is finished. | |
407 | */ | |
408 | mntinvalbuf(mountp) | |
409 | struct mount *mountp; | |
410 | { | |
411 | register struct vnode *vp; | |
412 | int dirty = 0; | |
413 | ||
414 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
415 | panic("mntinvalbuf: not busy"); | |
416 | loop: | |
417 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
418 | if (vget(vp)) | |
419 | goto loop; | |
420 | dirty += vinvalbuf(vp, 1); | |
421 | vput(vp); | |
422 | if (vp->v_mount != mountp) | |
423 | goto loop; | |
424 | } | |
425 | return (dirty); | |
426 | } | |
427 | ||
428 | /* | |
429 | * Flush out and invalidate all buffers associated with a vnode. | |
430 | * Called with the underlying object locked. | |
431 | */ | |
432 | vinvalbuf(vp, save) | |
433 | register struct vnode *vp; | |
434 | int save; | |
435 | { | |
436 | register struct buf *bp; | |
437 | struct buf *nbp, *blist; | |
438 | int s, dirty = 0; | |
439 | ||
440 | for (;;) { | |
441 | if (blist = vp->v_dirtyblkhd) | |
442 | /* void */; | |
443 | else if (blist = vp->v_cleanblkhd) | |
444 | /* void */; | |
445 | else | |
446 | break; | |
447 | for (bp = blist; bp; bp = nbp) { | |
448 | nbp = bp->b_blockf; | |
449 | s = splbio(); | |
450 | if (bp->b_flags & B_BUSY) { | |
451 | bp->b_flags |= B_WANTED; | |
452 | sleep((caddr_t)bp, PRIBIO + 1); | |
453 | splx(s); | |
454 | break; | |
455 | } | |
456 | bremfree(bp); | |
457 | bp->b_flags |= B_BUSY; | |
458 | splx(s); | |
459 | if (save && (bp->b_flags & B_DELWRI)) { | |
460 | dirty++; | |
461 | (void) bwrite(bp); | |
462 | break; | |
463 | } | |
464 | if (bp->b_vp != vp) | |
465 | reassignbuf(bp, bp->b_vp); | |
466 | else | |
467 | bp->b_flags |= B_INVAL; | |
468 | brelse(bp); | |
469 | } | |
470 | } | |
471 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
472 | panic("vinvalbuf: flush failed"); | |
473 | return (dirty); | |
474 | } | |
475 | ||
476 | /* | |
477 | * Associate a buffer with a vnode. | |
478 | */ | |
479 | bgetvp(vp, bp) | |
480 | register struct vnode *vp; | |
481 | register struct buf *bp; | |
482 | { | |
483 | ||
484 | if (bp->b_vp) | |
485 | panic("bgetvp: not free"); | |
486 | VHOLD(vp); | |
487 | bp->b_vp = vp; | |
488 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
489 | bp->b_dev = vp->v_rdev; | |
490 | else | |
491 | bp->b_dev = NODEV; | |
492 | /* | |
493 | * Insert onto list for new vnode. | |
494 | */ | |
495 | if (vp->v_cleanblkhd) { | |
496 | bp->b_blockf = vp->v_cleanblkhd; | |
497 | bp->b_blockb = &vp->v_cleanblkhd; | |
498 | vp->v_cleanblkhd->b_blockb = &bp->b_blockf; | |
499 | vp->v_cleanblkhd = bp; | |
500 | } else { | |
501 | vp->v_cleanblkhd = bp; | |
502 | bp->b_blockb = &vp->v_cleanblkhd; | |
503 | bp->b_blockf = NULL; | |
504 | } | |
505 | } | |
506 | ||
507 | /* | |
508 | * Disassociate a buffer from a vnode. | |
509 | */ | |
510 | brelvp(bp) | |
511 | register struct buf *bp; | |
512 | { | |
513 | struct buf *bq; | |
514 | struct vnode *vp; | |
515 | ||
516 | if (bp->b_vp == (struct vnode *) 0) | |
517 | panic("brelvp: NULL"); | |
518 | /* | |
519 | * Delete from old vnode list, if on one. | |
520 | */ | |
521 | if (bp->b_blockb) { | |
522 | if (bq = bp->b_blockf) | |
523 | bq->b_blockb = bp->b_blockb; | |
524 | *bp->b_blockb = bq; | |
525 | bp->b_blockf = NULL; | |
526 | bp->b_blockb = NULL; | |
527 | } | |
528 | vp = bp->b_vp; | |
529 | bp->b_vp = (struct vnode *) 0; | |
530 | HOLDRELE(vp); | |
531 | } | |
532 | ||
533 | /* | |
534 | * Reassign a buffer from one vnode to another. | |
535 | * Used to assign file specific control information | |
536 | * (indirect blocks) to the vnode to which they belong. | |
537 | */ | |
538 | reassignbuf(bp, newvp) | |
539 | register struct buf *bp; | |
540 | register struct vnode *newvp; | |
541 | { | |
542 | register struct buf *bq, **listheadp; | |
543 | ||
544 | if (newvp == NULL) | |
545 | panic("reassignbuf: NULL"); | |
546 | /* | |
547 | * Delete from old vnode list, if on one. | |
548 | */ | |
549 | if (bp->b_blockb) { | |
550 | if (bq = bp->b_blockf) | |
551 | bq->b_blockb = bp->b_blockb; | |
552 | *bp->b_blockb = bq; | |
553 | } | |
554 | /* | |
555 | * If dirty, put on list of dirty buffers; | |
556 | * otherwise insert onto list of clean buffers. | |
557 | */ | |
558 | if (bp->b_flags & B_DELWRI) | |
559 | listheadp = &newvp->v_dirtyblkhd; | |
560 | else | |
561 | listheadp = &newvp->v_cleanblkhd; | |
562 | if (*listheadp) { | |
563 | bp->b_blockf = *listheadp; | |
564 | bp->b_blockb = listheadp; | |
565 | bp->b_blockf->b_blockb = &bp->b_blockf; | |
566 | *listheadp = bp; | |
567 | } else { | |
568 | *listheadp = bp; | |
569 | bp->b_blockb = listheadp; | |
570 | bp->b_blockf = NULL; | |
571 | } | |
572 | } | |
573 | ||
36d09cb1 | 574 | /* |
ef24f6dd KM |
575 | * Create a vnode for a block device. |
576 | * Used for root filesystem, argdev, and swap areas. | |
577 | * Also used for memory file system special devices. | |
578 | */ | |
579 | bdevvp(dev, vpp) | |
580 | dev_t dev; | |
581 | struct vnode **vpp; | |
582 | { | |
ef24f6dd KM |
583 | register struct vnode *vp; |
584 | struct vnode *nvp; | |
585 | int error; | |
586 | ||
1c89915d KM |
587 | if (dev == NODEV) |
588 | return (0); | |
4ef5d036 | 589 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
590 | if (error) { |
591 | *vpp = 0; | |
592 | return (error); | |
593 | } | |
594 | vp = nvp; | |
595 | vp->v_type = VBLK; | |
c0de8792 | 596 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
597 | vput(vp); |
598 | vp = nvp; | |
599 | } | |
600 | *vpp = vp; | |
601 | return (0); | |
602 | } | |
603 | ||
604 | /* | |
605 | * Check to see if the new vnode represents a special device | |
606 | * for which we already have a vnode (either because of | |
607 | * bdevvp() or because of a different vnode representing | |
608 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 609 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
610 | * caller is responsible for filling it with its new contents. |
611 | */ | |
612 | struct vnode * | |
c0de8792 | 613 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 614 | register struct vnode *nvp; |
c0de8792 | 615 | dev_t nvp_rdev; |
ef24f6dd KM |
616 | struct mount *mp; |
617 | { | |
618 | register struct vnode *vp; | |
c0de8792 | 619 | struct vnode **vpp; |
ef24f6dd KM |
620 | |
621 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 622 | return (NULLVP); |
c0de8792 KM |
623 | |
624 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 625 | loop: |
c0de8792 KM |
626 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
627 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 628 | continue; |
c0de8792 KM |
629 | /* |
630 | * Alias, but not in use, so flush it out. | |
631 | */ | |
7f7b7d89 | 632 | if (vp->v_usecount == 0) { |
c0de8792 KM |
633 | vgone(vp); |
634 | goto loop; | |
635 | } | |
ef62830d KM |
636 | if (vget(vp)) |
637 | goto loop; | |
ef24f6dd KM |
638 | break; |
639 | } | |
c0de8792 | 640 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
641 | MALLOC(nvp->v_specinfo, struct specinfo *, |
642 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
643 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 644 | nvp->v_hashchain = vpp; |
c0de8792 | 645 | nvp->v_specnext = *vpp; |
2c957a90 | 646 | nvp->v_specflags = 0; |
c0de8792 | 647 | *vpp = nvp; |
40452d5e KM |
648 | if (vp != NULL) { |
649 | nvp->v_flag |= VALIASED; | |
650 | vp->v_flag |= VALIASED; | |
651 | vput(vp); | |
652 | } | |
54fb9dc2 | 653 | return (NULLVP); |
ef24f6dd | 654 | } |
2bae1875 KM |
655 | VOP_UNLOCK(vp); |
656 | vclean(vp, 0); | |
ef24f6dd KM |
657 | vp->v_op = nvp->v_op; |
658 | vp->v_tag = nvp->v_tag; | |
659 | nvp->v_type = VNON; | |
660 | insmntque(vp, mp); | |
661 | return (vp); | |
662 | } | |
663 | ||
664 | /* | |
665 | * Grab a particular vnode from the free list, increment its | |
666 | * reference count and lock it. The vnode lock bit is set the | |
667 | * vnode is being eliminated in vgone. The process is awakened | |
668 | * when the transition is completed, and an error returned to | |
669 | * indicate that the vnode is no longer usable (possibly having | |
670 | * been changed to a new file system type). | |
36d09cb1 KM |
671 | */ |
672 | vget(vp) | |
673 | register struct vnode *vp; | |
674 | { | |
675 | register struct vnode *vq; | |
676 | ||
ef24f6dd KM |
677 | if (vp->v_flag & VXLOCK) { |
678 | vp->v_flag |= VXWANT; | |
679 | sleep((caddr_t)vp, PINOD); | |
680 | return (1); | |
681 | } | |
7f7b7d89 | 682 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
683 | if (vq = vp->v_freef) |
684 | vq->v_freeb = vp->v_freeb; | |
685 | else | |
686 | vfreet = vp->v_freeb; | |
687 | *vp->v_freeb = vq; | |
688 | vp->v_freef = NULL; | |
689 | vp->v_freeb = NULL; | |
690 | } | |
36d09cb1 | 691 | VREF(vp); |
ef24f6dd KM |
692 | VOP_LOCK(vp); |
693 | return (0); | |
36d09cb1 KM |
694 | } |
695 | ||
696 | /* | |
697 | * Vnode reference, just increment the count | |
698 | */ | |
699 | void vref(vp) | |
700 | struct vnode *vp; | |
701 | { | |
702 | ||
7f7b7d89 | 703 | vp->v_usecount++; |
36d09cb1 KM |
704 | } |
705 | ||
706 | /* | |
707 | * vput(), just unlock and vrele() | |
708 | */ | |
709 | void vput(vp) | |
710 | register struct vnode *vp; | |
711 | { | |
712 | VOP_UNLOCK(vp); | |
713 | vrele(vp); | |
714 | } | |
715 | ||
716 | /* | |
717 | * Vnode release. | |
718 | * If count drops to zero, call inactive routine and return to freelist. | |
719 | */ | |
720 | void vrele(vp) | |
721 | register struct vnode *vp; | |
722 | { | |
c099667a | 723 | struct proc *p = curproc; /* XXX */ |
36d09cb1 KM |
724 | |
725 | if (vp == NULL) | |
ef24f6dd | 726 | panic("vrele: null vp"); |
7f7b7d89 KM |
727 | vp->v_usecount--; |
728 | if (vp->v_usecount < 0) | |
0bf84b18 | 729 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 730 | if (vp->v_usecount > 0) |
36d09cb1 | 731 | return; |
54fb9dc2 | 732 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
733 | /* |
734 | * insert into empty list | |
735 | */ | |
736 | vfreeh = vp; | |
737 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
738 | } else { |
739 | /* | |
740 | * insert at tail of list | |
741 | */ | |
742 | *vfreet = vp; | |
743 | vp->v_freeb = vfreet; | |
36d09cb1 | 744 | } |
ef24f6dd KM |
745 | vp->v_freef = NULL; |
746 | vfreet = &vp->v_freef; | |
c099667a | 747 | VOP_INACTIVE(vp, p); |
ef24f6dd KM |
748 | } |
749 | ||
7f7b7d89 KM |
750 | /* |
751 | * Page or buffer structure gets a reference. | |
752 | */ | |
753 | vhold(vp) | |
754 | register struct vnode *vp; | |
755 | { | |
756 | ||
757 | vp->v_holdcnt++; | |
758 | } | |
759 | ||
760 | /* | |
761 | * Page or buffer structure frees a reference. | |
762 | */ | |
763 | holdrele(vp) | |
764 | register struct vnode *vp; | |
765 | { | |
766 | ||
767 | if (vp->v_holdcnt <= 0) | |
768 | panic("holdrele: holdcnt"); | |
769 | vp->v_holdcnt--; | |
770 | } | |
771 | ||
f0556f86 KM |
772 | /* |
773 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
774 | * | |
775 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
776 | * return error if any are found (nb: this is a user error, not a | |
777 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
778 | * that are found. | |
779 | */ | |
780 | int busyprt = 0; /* patch to print out busy vnodes */ | |
781 | ||
782 | vflush(mp, skipvp, flags) | |
783 | struct mount *mp; | |
784 | struct vnode *skipvp; | |
785 | int flags; | |
786 | { | |
787 | register struct vnode *vp, *nvp; | |
788 | int busy = 0; | |
789 | ||
54fb9dc2 | 790 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 791 | panic("vflush: not busy"); |
4597dd33 | 792 | loop: |
54fb9dc2 | 793 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
794 | if (vp->v_mount != mp) |
795 | goto loop; | |
f0556f86 KM |
796 | nvp = vp->v_mountf; |
797 | /* | |
798 | * Skip over a selected vnode. | |
f0556f86 KM |
799 | */ |
800 | if (vp == skipvp) | |
801 | continue; | |
36ef03ec KM |
802 | /* |
803 | * Skip over a vnodes marked VSYSTEM. | |
804 | */ | |
805 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
806 | continue; | |
f0556f86 | 807 | /* |
7f7b7d89 | 808 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
809 | * out the vnode data structures and we are done. |
810 | */ | |
7f7b7d89 | 811 | if (vp->v_usecount == 0) { |
f0556f86 KM |
812 | vgone(vp); |
813 | continue; | |
814 | } | |
815 | /* | |
816 | * For block or character devices, revert to an | |
817 | * anonymous device. For all other files, just kill them. | |
818 | */ | |
36ef03ec | 819 | if (flags & FORCECLOSE) { |
f0556f86 KM |
820 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
821 | vgone(vp); | |
822 | } else { | |
823 | vclean(vp, 0); | |
824 | vp->v_op = &spec_vnodeops; | |
825 | insmntque(vp, (struct mount *)0); | |
826 | } | |
827 | continue; | |
828 | } | |
829 | if (busyprt) | |
0bf84b18 | 830 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
831 | busy++; |
832 | } | |
833 | if (busy) | |
834 | return (EBUSY); | |
835 | return (0); | |
836 | } | |
837 | ||
ef24f6dd KM |
838 | /* |
839 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 840 | */ |
36ef03ec | 841 | void vclean(vp, flags) |
ef24f6dd | 842 | register struct vnode *vp; |
aacc1bff | 843 | int flags; |
ef24f6dd KM |
844 | { |
845 | struct vnodeops *origops; | |
2bae1875 | 846 | int active; |
c099667a | 847 | struct proc *p = curproc; /* XXX */ |
ef24f6dd | 848 | |
2bae1875 KM |
849 | /* |
850 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
851 | * If so we have to reference it before we clean it out |
852 | * so that its count cannot fall to zero and generate a | |
853 | * race against ourselves to recycle it. | |
2bae1875 | 854 | */ |
7f7b7d89 | 855 | if (active = vp->v_usecount) |
2bae1875 | 856 | VREF(vp); |
2bae1875 KM |
857 | /* |
858 | * Prevent the vnode from being recycled or | |
859 | * brought into use while we clean it out. | |
860 | */ | |
0bf84b18 KM |
861 | if (vp->v_flag & VXLOCK) |
862 | panic("vclean: deadlock"); | |
ef24f6dd | 863 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
864 | /* |
865 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
866 | * have the object locked while it cleans it out. The VOP_LOCK | |
867 | * ensures that the VOP_INACTIVE routine is done with its work. | |
868 | * For active vnodes, it ensures that no other activity can | |
869 | * occur while the buffer list is being cleaned out. | |
870 | */ | |
871 | VOP_LOCK(vp); | |
36ef03ec | 872 | if (flags & DOCLOSE) |
0bf84b18 | 873 | vinvalbuf(vp, 1); |
ef24f6dd KM |
874 | /* |
875 | * Prevent any further operations on the vnode from | |
876 | * being passed through to the old file system. | |
877 | */ | |
878 | origops = vp->v_op; | |
879 | vp->v_op = &dead_vnodeops; | |
880 | vp->v_tag = VT_NON; | |
881 | /* | |
2bae1875 KM |
882 | * If purging an active vnode, it must be unlocked, closed, |
883 | * and deactivated before being reclaimed. | |
ef24f6dd | 884 | */ |
0bf84b18 | 885 | (*(origops->vn_unlock))(vp); |
2bae1875 | 886 | if (active) { |
36ef03ec | 887 | if (flags & DOCLOSE) |
44b28806 | 888 | (*(origops->vn_close))(vp, IO_NDELAY, NOCRED, p); |
c099667a | 889 | (*(origops->vn_inactive))(vp, p); |
ef24f6dd KM |
890 | } |
891 | /* | |
892 | * Reclaim the vnode. | |
893 | */ | |
894 | if ((*(origops->vn_reclaim))(vp)) | |
895 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
896 | if (active) |
897 | vrele(vp); | |
ef24f6dd KM |
898 | /* |
899 | * Done with purge, notify sleepers in vget of the grim news. | |
900 | */ | |
901 | vp->v_flag &= ~VXLOCK; | |
902 | if (vp->v_flag & VXWANT) { | |
903 | vp->v_flag &= ~VXWANT; | |
904 | wakeup((caddr_t)vp); | |
905 | } | |
906 | } | |
907 | ||
ef62830d KM |
908 | /* |
909 | * Eliminate all activity associated with the requested vnode | |
910 | * and with all vnodes aliased to the requested vnode. | |
911 | */ | |
912 | void vgoneall(vp) | |
913 | register struct vnode *vp; | |
914 | { | |
7f7b7d89 | 915 | register struct vnode *vq; |
ef62830d | 916 | |
7a7b3a95 KM |
917 | if (vp->v_flag & VALIASED) { |
918 | /* | |
919 | * If a vgone (or vclean) is already in progress, | |
920 | * wait until it is done and return. | |
921 | */ | |
922 | if (vp->v_flag & VXLOCK) { | |
923 | vp->v_flag |= VXWANT; | |
924 | sleep((caddr_t)vp, PINOD); | |
925 | return; | |
926 | } | |
927 | /* | |
928 | * Ensure that vp will not be vgone'd while we | |
929 | * are eliminating its aliases. | |
930 | */ | |
931 | vp->v_flag |= VXLOCK; | |
932 | while (vp->v_flag & VALIASED) { | |
933 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
934 | if (vq->v_rdev != vp->v_rdev || | |
935 | vq->v_type != vp->v_type || vp == vq) | |
936 | continue; | |
937 | vgone(vq); | |
938 | break; | |
939 | } | |
ef62830d | 940 | } |
7a7b3a95 KM |
941 | /* |
942 | * Remove the lock so that vgone below will | |
943 | * really eliminate the vnode after which time | |
944 | * vgone will awaken any sleepers. | |
945 | */ | |
946 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
947 | } |
948 | vgone(vp); | |
949 | } | |
950 | ||
ef24f6dd KM |
951 | /* |
952 | * Eliminate all activity associated with a vnode | |
953 | * in preparation for reuse. | |
954 | */ | |
955 | void vgone(vp) | |
956 | register struct vnode *vp; | |
957 | { | |
7f7b7d89 | 958 | register struct vnode *vq; |
c0de8792 KM |
959 | struct vnode *vx; |
960 | long count; | |
ef24f6dd | 961 | |
4f55e3ec KM |
962 | /* |
963 | * If a vgone (or vclean) is already in progress, | |
964 | * wait until it is done and return. | |
965 | */ | |
966 | if (vp->v_flag & VXLOCK) { | |
967 | vp->v_flag |= VXWANT; | |
968 | sleep((caddr_t)vp, PINOD); | |
969 | return; | |
970 | } | |
ef24f6dd KM |
971 | /* |
972 | * Clean out the filesystem specific data. | |
973 | */ | |
36ef03ec | 974 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
975 | /* |
976 | * Delete from old mount point vnode list, if on one. | |
977 | */ | |
978 | if (vp->v_mountb) { | |
979 | if (vq = vp->v_mountf) | |
980 | vq->v_mountb = vp->v_mountb; | |
981 | *vp->v_mountb = vq; | |
982 | vp->v_mountf = NULL; | |
983 | vp->v_mountb = NULL; | |
984 | } | |
985 | /* | |
986 | * If special device, remove it from special device alias list. | |
987 | */ | |
988 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
989 | if (*vp->v_hashchain == vp) { |
990 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 991 | } else { |
7f7b7d89 | 992 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 993 | if (vq->v_specnext != vp) |
ef24f6dd | 994 | continue; |
c0de8792 | 995 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
996 | break; |
997 | } | |
c0de8792 | 998 | if (vq == NULL) |
ef24f6dd KM |
999 | panic("missing bdev"); |
1000 | } | |
c0de8792 | 1001 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
1002 | count = 0; |
1003 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
1004 | if (vq->v_rdev != vp->v_rdev || |
1005 | vq->v_type != vp->v_type) | |
c0de8792 KM |
1006 | continue; |
1007 | count++; | |
1008 | vx = vq; | |
1009 | } | |
1010 | if (count == 0) | |
1011 | panic("missing alias"); | |
1012 | if (count == 1) | |
1013 | vx->v_flag &= ~VALIASED; | |
1014 | vp->v_flag &= ~VALIASED; | |
1015 | } | |
1016 | FREE(vp->v_specinfo, M_VNODE); | |
1017 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
1018 | } |
1019 | /* | |
1020 | * If it is on the freelist, move it to the head of the list. | |
1021 | */ | |
1022 | if (vp->v_freeb) { | |
1023 | if (vq = vp->v_freef) | |
1024 | vq->v_freeb = vp->v_freeb; | |
1025 | else | |
1026 | vfreet = vp->v_freeb; | |
1027 | *vp->v_freeb = vq; | |
1028 | vp->v_freef = vfreeh; | |
1029 | vp->v_freeb = &vfreeh; | |
1030 | vfreeh->v_freeb = &vp->v_freef; | |
1031 | vfreeh = vp; | |
1032 | } | |
2bae1875 | 1033 | vp->v_type = VBAD; |
36d09cb1 | 1034 | } |
ef62830d | 1035 | |
2bcd6066 KM |
1036 | /* |
1037 | * Lookup a vnode by device number. | |
1038 | */ | |
1039 | vfinddev(dev, type, vpp) | |
1040 | dev_t dev; | |
1041 | enum vtype type; | |
1042 | struct vnode **vpp; | |
1043 | { | |
1044 | register struct vnode *vp; | |
1045 | ||
1046 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
1047 | if (dev != vp->v_rdev || type != vp->v_type) | |
1048 | continue; | |
1049 | *vpp = vp; | |
1050 | return (0); | |
1051 | } | |
1052 | return (1); | |
1053 | } | |
1054 | ||
ef62830d KM |
1055 | /* |
1056 | * Calculate the total number of references to a special device. | |
1057 | */ | |
1058 | vcount(vp) | |
1059 | register struct vnode *vp; | |
1060 | { | |
7f7b7d89 | 1061 | register struct vnode *vq; |
ef62830d KM |
1062 | int count; |
1063 | ||
1064 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 1065 | return (vp->v_usecount); |
ef62830d | 1066 | loop: |
7f7b7d89 | 1067 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 1068 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1069 | continue; |
1070 | /* | |
1071 | * Alias, but not in use, so flush it out. | |
1072 | */ | |
7f7b7d89 | 1073 | if (vq->v_usecount == 0) { |
ef62830d KM |
1074 | vgone(vq); |
1075 | goto loop; | |
1076 | } | |
7f7b7d89 | 1077 | count += vq->v_usecount; |
ef62830d KM |
1078 | } |
1079 | return (count); | |
1080 | } | |
0bf84b18 KM |
1081 | |
1082 | /* | |
1083 | * Print out a description of a vnode. | |
1084 | */ | |
1085 | static char *typename[] = | |
61f846a8 | 1086 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1087 | |
1088 | vprint(label, vp) | |
1089 | char *label; | |
1090 | register struct vnode *vp; | |
1091 | { | |
f2f730c6 | 1092 | char buf[64]; |
0bf84b18 KM |
1093 | |
1094 | if (label != NULL) | |
1095 | printf("%s: ", label); | |
f2f730c6 | 1096 | printf("type %s, usecount %d, refcount %d,", typename[vp->v_type], |
7f7b7d89 | 1097 | vp->v_usecount, vp->v_holdcnt); |
f2f730c6 KM |
1098 | buf[0] = '\0'; |
1099 | if (vp->v_flag & VROOT) | |
1100 | strcat(buf, "|VROOT"); | |
1101 | if (vp->v_flag & VTEXT) | |
1102 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1103 | if (vp->v_flag & VSYSTEM) |
1104 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1105 | if (vp->v_flag & VXLOCK) |
1106 | strcat(buf, "|VXLOCK"); | |
1107 | if (vp->v_flag & VXWANT) | |
1108 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1109 | if (vp->v_flag & VBWAIT) |
1110 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1111 | if (vp->v_flag & VALIASED) |
1112 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1113 | if (buf[0] != '\0') |
1114 | printf(" flags (%s)", &buf[1]); | |
1115 | printf("\n\t"); | |
0bf84b18 KM |
1116 | VOP_PRINT(vp); |
1117 | } | |
985cbdd5 MT |
1118 | |
1119 | int kinfo_vdebug = 1; | |
1120 | int kinfo_vgetfailed; | |
1121 | #define KINFO_VNODESLOP 10 | |
1122 | /* | |
1123 | * Dump vnode list (via kinfo). | |
1124 | * Copyout address of vnode followed by vnode. | |
1125 | */ | |
aacc1bff | 1126 | /* ARGSUSED */ |
985cbdd5 | 1127 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1128 | int op; |
985cbdd5 | 1129 | char *where; |
aacc1bff | 1130 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1131 | { |
1132 | register struct mount *mp = rootfs; | |
36ef03ec | 1133 | struct mount *omp; |
985cbdd5 | 1134 | struct vnode *vp; |
985cbdd5 MT |
1135 | register char *bp = where, *savebp; |
1136 | char *ewhere = where + *acopysize; | |
1137 | int error; | |
1138 | ||
1139 | #define VPTRSZ sizeof (struct vnode *) | |
1140 | #define VNODESZ sizeof (struct vnode) | |
1141 | if (where == NULL) { | |
1142 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1143 | return (0); | |
1144 | } | |
1145 | ||
985cbdd5 | 1146 | do { |
36ef03ec | 1147 | if (vfs_busy(mp)) { |
54fb9dc2 | 1148 | mp = mp->mnt_next; |
36ef03ec KM |
1149 | continue; |
1150 | } | |
985cbdd5 MT |
1151 | savebp = bp; |
1152 | again: | |
4597dd33 | 1153 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1154 | /* |
1155 | * Check that the vp is still associated with | |
1156 | * this filesystem. RACE: could have been | |
1157 | * recycled onto the same filesystem. | |
1158 | */ | |
4597dd33 KM |
1159 | if (vp->v_mount != mp) { |
1160 | if (kinfo_vdebug) | |
1161 | printf("kinfo: vp changed\n"); | |
1162 | bp = savebp; | |
1163 | goto again; | |
1164 | } | |
985cbdd5 MT |
1165 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1166 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1167 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1168 | VNODESZ)))) |
985cbdd5 | 1169 | return (error); |
985cbdd5 | 1170 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1171 | } |
36ef03ec | 1172 | omp = mp; |
54fb9dc2 | 1173 | mp = mp->mnt_next; |
36ef03ec | 1174 | vfs_unbusy(omp); |
985cbdd5 MT |
1175 | } while (mp != rootfs); |
1176 | ||
1177 | *aneeded = bp - where; | |
1178 | if (bp > ewhere) | |
1179 | *acopysize = ewhere - where; | |
1180 | else | |
1181 | *acopysize = bp - where; | |
1182 | return (0); | |
1183 | } |