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 | * |
e5c3f16e | 7 | * @(#)vfs_subr.c 7.70 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
cb796a23 KB |
14 | #include <sys/param.h> |
15 | #include <sys/proc.h> | |
16 | #include <sys/mount.h> | |
17 | #include <sys/time.h> | |
18 | #include <sys/vnode.h> | |
807cc430 | 19 | #include <sys/stat.h> |
cb796a23 KB |
20 | #include <sys/specdev.h> |
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 | |
807cc430 KM |
27 | enum vtype iftovt_tab[16] = { |
28 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
29 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
30 | }; | |
31 | int vttoif_tab[9] = { | |
32 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
33 | S_IFSOCK, S_IFIFO, S_IFMT, | |
34 | }; | |
35 | ||
3c4390e8 KM |
36 | /* |
37 | * Remove a mount point from the list of mounted filesystems. | |
38 | * Unmount of the root is illegal. | |
39 | */ | |
40 | void | |
41 | vfs_remove(mp) | |
42 | register struct mount *mp; | |
43 | { | |
44 | ||
45 | if (mp == rootfs) | |
46 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
47 | mp->mnt_prev->mnt_next = mp->mnt_next; |
48 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
49 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
50 | vfs_unlock(mp); |
51 | } | |
52 | ||
53 | /* | |
54 | * Lock a filesystem. | |
55 | * Used to prevent access to it while mounting and unmounting. | |
56 | */ | |
57 | vfs_lock(mp) | |
58 | register struct mount *mp; | |
59 | { | |
60 | ||
54fb9dc2 KM |
61 | while(mp->mnt_flag & MNT_MLOCK) { |
62 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
63 | sleep((caddr_t)mp, PVFS); |
64 | } | |
54fb9dc2 | 65 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
66 | return (0); |
67 | } | |
68 | ||
69 | /* | |
70 | * Unlock a locked filesystem. | |
71 | * Panic if filesystem is not locked. | |
72 | */ | |
73 | void | |
74 | vfs_unlock(mp) | |
75 | register struct mount *mp; | |
76 | { | |
77 | ||
54fb9dc2 | 78 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 79 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
80 | mp->mnt_flag &= ~MNT_MLOCK; |
81 | if (mp->mnt_flag & MNT_MWAIT) { | |
82 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
83 | wakeup((caddr_t)mp); |
84 | } | |
85 | } | |
86 | ||
36ef03ec KM |
87 | /* |
88 | * Mark a mount point as busy. | |
89 | * Used to synchronize access and to delay unmounting. | |
90 | */ | |
91 | vfs_busy(mp) | |
92 | register struct mount *mp; | |
93 | { | |
94 | ||
54fb9dc2 KM |
95 | while(mp->mnt_flag & MNT_MPBUSY) { |
96 | mp->mnt_flag |= MNT_MPWANT; | |
97 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 98 | } |
d8b63609 KM |
99 | if (mp->mnt_flag & MNT_UNMOUNT) |
100 | return (1); | |
54fb9dc2 | 101 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
102 | return (0); |
103 | } | |
104 | ||
105 | /* | |
106 | * Free a busy filesystem. | |
107 | * Panic if filesystem is not busy. | |
108 | */ | |
36ef03ec KM |
109 | vfs_unbusy(mp) |
110 | register struct mount *mp; | |
111 | { | |
112 | ||
54fb9dc2 | 113 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 114 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
115 | mp->mnt_flag &= ~MNT_MPBUSY; |
116 | if (mp->mnt_flag & MNT_MPWANT) { | |
117 | mp->mnt_flag &= ~MNT_MPWANT; | |
118 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
119 | } |
120 | } | |
121 | ||
3c4390e8 KM |
122 | /* |
123 | * Lookup a mount point by filesystem identifier. | |
124 | */ | |
125 | struct mount * | |
126 | getvfs(fsid) | |
127 | fsid_t *fsid; | |
128 | { | |
129 | register struct mount *mp; | |
130 | ||
d713f801 KM |
131 | mp = rootfs; |
132 | do { | |
54fb9dc2 KM |
133 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
134 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 135 | return (mp); |
3c4390e8 | 136 | } |
54fb9dc2 | 137 | mp = mp->mnt_next; |
d713f801 KM |
138 | } while (mp != rootfs); |
139 | return ((struct mount *)0); | |
3c4390e8 KM |
140 | } |
141 | ||
142 | /* | |
143 | * Set vnode attributes to VNOVAL | |
144 | */ | |
145 | void vattr_null(vap) | |
146 | register struct vattr *vap; | |
147 | { | |
148 | ||
149 | vap->va_type = VNON; | |
83504fd5 KM |
150 | vap->va_size = vap->va_bytes = VNOVAL; |
151 | #ifdef _NOQUAD | |
152 | vap->va_size_rsv = vap->va_bytes_rsv = VNOVAL; | |
153 | #endif | |
3c4390e8 | 154 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
155 | vap->va_fsid = vap->va_fileid = |
156 | vap->va_blocksize = vap->va_rdev = | |
3c4390e8 KM |
157 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
158 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
159 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
160 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 161 | } |
c60798ca | 162 | |
36d09cb1 KM |
163 | /* |
164 | * Routines having to do with the management of the vnode table. | |
165 | */ | |
166 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 167 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 168 | extern void vclean(); |
1a80f56e | 169 | long numvnodes; |
d3664d8f | 170 | struct vattr va_null; |
c0de8792 | 171 | |
36d09cb1 | 172 | /* |
ef24f6dd | 173 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 174 | */ |
ef24f6dd | 175 | vfsinit() |
36d09cb1 | 176 | { |
ef24f6dd | 177 | struct vfsops **vfsp; |
36d09cb1 | 178 | |
ef24f6dd KM |
179 | /* |
180 | * Initialize the vnode name cache | |
181 | */ | |
182 | nchinit(); | |
183 | /* | |
184 | * Initialize each file system type. | |
185 | */ | |
d3664d8f | 186 | vattr_null(&va_null); |
ef24f6dd KM |
187 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
188 | if (*vfsp == NULL) | |
189 | continue; | |
190 | (*(*vfsp)->vfs_init)(); | |
191 | } | |
36d09cb1 KM |
192 | } |
193 | ||
194 | /* | |
195 | * Return the next vnode from the free list. | |
196 | */ | |
197 | getnewvnode(tag, mp, vops, vpp) | |
198 | enum vtagtype tag; | |
199 | struct mount *mp; | |
200 | struct vnodeops *vops; | |
201 | struct vnode **vpp; | |
202 | { | |
203 | register struct vnode *vp, *vq; | |
204 | ||
1a80f56e | 205 | if (numvnodes < desiredvnodes) { |
aacc1bff KM |
206 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
207 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
208 | bzero((char *)vp, sizeof *vp); |
209 | numvnodes++; | |
210 | } else { | |
211 | if ((vp = vfreeh) == NULL) { | |
212 | tablefull("vnode"); | |
213 | *vpp = 0; | |
214 | return (ENFILE); | |
215 | } | |
216 | if (vp->v_usecount) | |
217 | panic("free vnode isn't"); | |
218 | if (vq = vp->v_freef) | |
219 | vq->v_freeb = &vfreeh; | |
220 | else | |
221 | vfreet = &vfreeh; | |
222 | vfreeh = vq; | |
223 | vp->v_freef = NULL; | |
224 | vp->v_freeb = NULL; | |
39b99eb6 | 225 | vp->v_lease = NULL; |
1a80f56e KM |
226 | if (vp->v_type != VBAD) |
227 | vgone(vp); | |
2345b093 KM |
228 | if (vp->v_data) |
229 | panic("cleaned vnode isn't"); | |
1a80f56e | 230 | vp->v_flag = 0; |
1a80f56e KM |
231 | vp->v_lastr = 0; |
232 | vp->v_socket = 0; | |
36d09cb1 | 233 | } |
b027498b | 234 | vp->v_type = VNON; |
36d09cb1 KM |
235 | cache_purge(vp); |
236 | vp->v_tag = tag; | |
ef24f6dd | 237 | vp->v_op = vops; |
36d09cb1 KM |
238 | insmntque(vp, mp); |
239 | VREF(vp); | |
240 | *vpp = vp; | |
241 | return (0); | |
242 | } | |
243 | ||
244 | /* | |
245 | * Move a vnode from one mount queue to another. | |
246 | */ | |
247 | insmntque(vp, mp) | |
248 | register struct vnode *vp; | |
249 | register struct mount *mp; | |
250 | { | |
8136adfc | 251 | register struct vnode *vq; |
36d09cb1 KM |
252 | |
253 | /* | |
254 | * Delete from old mount point vnode list, if on one. | |
255 | */ | |
256 | if (vp->v_mountb) { | |
257 | if (vq = vp->v_mountf) | |
258 | vq->v_mountb = vp->v_mountb; | |
259 | *vp->v_mountb = vq; | |
260 | } | |
261 | /* | |
262 | * Insert into list of vnodes for the new mount point, if available. | |
263 | */ | |
a45ff315 | 264 | vp->v_mount = mp; |
36d09cb1 KM |
265 | if (mp == NULL) { |
266 | vp->v_mountf = NULL; | |
267 | vp->v_mountb = NULL; | |
268 | return; | |
269 | } | |
8136adfc KM |
270 | if (vq = mp->mnt_mounth) |
271 | vq->v_mountb = &vp->v_mountf; | |
272 | vp->v_mountf = vq; | |
273 | vp->v_mountb = &mp->mnt_mounth; | |
274 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
275 | } |
276 | ||
76429560 KM |
277 | /* |
278 | * Make sure all write-behind blocks associated | |
279 | * with mount point are flushed out (from sync). | |
280 | */ | |
281 | mntflushbuf(mountp, flags) | |
282 | struct mount *mountp; | |
283 | int flags; | |
284 | { | |
285 | register struct vnode *vp; | |
286 | ||
287 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
288 | panic("mntflushbuf: not busy"); | |
289 | loop: | |
290 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
291 | if (VOP_ISLOCKED(vp)) | |
292 | continue; | |
293 | if (vget(vp)) | |
294 | goto loop; | |
295 | vflushbuf(vp, flags); | |
296 | vput(vp); | |
297 | if (vp->v_mount != mountp) | |
298 | goto loop; | |
299 | } | |
300 | } | |
301 | ||
302 | /* | |
303 | * Flush all dirty buffers associated with a vnode. | |
304 | */ | |
305 | vflushbuf(vp, flags) | |
306 | register struct vnode *vp; | |
307 | int flags; | |
308 | { | |
309 | register struct buf *bp; | |
310 | struct buf *nbp; | |
311 | int s; | |
312 | ||
313 | loop: | |
314 | s = splbio(); | |
315 | for (bp = vp->v_dirtyblkhd; bp; bp = nbp) { | |
316 | nbp = bp->b_blockf; | |
317 | if ((bp->b_flags & B_BUSY)) | |
318 | continue; | |
319 | if ((bp->b_flags & B_DELWRI) == 0) | |
320 | panic("vflushbuf: not dirty"); | |
321 | bremfree(bp); | |
322 | bp->b_flags |= B_BUSY; | |
323 | splx(s); | |
324 | /* | |
325 | * Wait for I/O associated with indirect blocks to complete, | |
326 | * since there is no way to quickly wait for them below. | |
327 | * NB: This is really specific to ufs, but is done here | |
328 | * as it is easier and quicker. | |
329 | */ | |
77dc8a8c | 330 | if (bp->b_vp == vp || (flags & B_SYNC) == 0) |
76429560 | 331 | (void) bawrite(bp); |
77dc8a8c | 332 | else |
76429560 | 333 | (void) bwrite(bp); |
77dc8a8c | 334 | goto loop; |
76429560 KM |
335 | } |
336 | splx(s); | |
337 | if ((flags & B_SYNC) == 0) | |
338 | return; | |
339 | s = splbio(); | |
340 | while (vp->v_numoutput) { | |
341 | vp->v_flag |= VBWAIT; | |
342 | sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1); | |
343 | } | |
344 | splx(s); | |
345 | if (vp->v_dirtyblkhd) { | |
346 | vprint("vflushbuf: dirty", vp); | |
347 | goto loop; | |
348 | } | |
349 | } | |
350 | ||
351 | /* | |
352 | * Update outstanding I/O count and do wakeup if requested. | |
353 | */ | |
354 | vwakeup(bp) | |
355 | register struct buf *bp; | |
356 | { | |
357 | register struct vnode *vp; | |
358 | ||
359 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
360 | if (vp = bp->b_vp) { | |
361 | vp->v_numoutput--; | |
362 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
363 | if (vp->v_numoutput < 0) | |
364 | panic("vwakeup: neg numoutput"); | |
365 | vp->v_flag &= ~VBWAIT; | |
366 | wakeup((caddr_t)&vp->v_numoutput); | |
367 | } | |
368 | } | |
369 | } | |
370 | ||
371 | /* | |
372 | * Invalidate in core blocks belonging to closed or umounted filesystem | |
373 | * | |
374 | * Go through the list of vnodes associated with the file system; | |
375 | * for each vnode invalidate any buffers that it holds. Normally | |
376 | * this routine is preceeded by a bflush call, so that on a quiescent | |
377 | * filesystem there will be no dirty buffers when we are done. Binval | |
378 | * returns the count of dirty buffers when it is finished. | |
379 | */ | |
380 | mntinvalbuf(mountp) | |
381 | struct mount *mountp; | |
382 | { | |
383 | register struct vnode *vp; | |
384 | int dirty = 0; | |
385 | ||
386 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
387 | panic("mntinvalbuf: not busy"); | |
388 | loop: | |
389 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
390 | if (vget(vp)) | |
391 | goto loop; | |
392 | dirty += vinvalbuf(vp, 1); | |
393 | vput(vp); | |
394 | if (vp->v_mount != mountp) | |
395 | goto loop; | |
396 | } | |
397 | return (dirty); | |
398 | } | |
399 | ||
400 | /* | |
401 | * Flush out and invalidate all buffers associated with a vnode. | |
402 | * Called with the underlying object locked. | |
403 | */ | |
404 | vinvalbuf(vp, save) | |
405 | register struct vnode *vp; | |
406 | int save; | |
407 | { | |
408 | register struct buf *bp; | |
409 | struct buf *nbp, *blist; | |
410 | int s, dirty = 0; | |
411 | ||
412 | for (;;) { | |
413 | if (blist = vp->v_dirtyblkhd) | |
414 | /* void */; | |
415 | else if (blist = vp->v_cleanblkhd) | |
416 | /* void */; | |
417 | else | |
418 | break; | |
419 | for (bp = blist; bp; bp = nbp) { | |
420 | nbp = bp->b_blockf; | |
421 | s = splbio(); | |
422 | if (bp->b_flags & B_BUSY) { | |
423 | bp->b_flags |= B_WANTED; | |
424 | sleep((caddr_t)bp, PRIBIO + 1); | |
425 | splx(s); | |
426 | break; | |
427 | } | |
428 | bremfree(bp); | |
429 | bp->b_flags |= B_BUSY; | |
430 | splx(s); | |
431 | if (save && (bp->b_flags & B_DELWRI)) { | |
24e9a81d KM |
432 | dirty++; |
433 | (void) VOP_BWRITE(bp); | |
76429560 KM |
434 | break; |
435 | } | |
436 | if (bp->b_vp != vp) | |
437 | reassignbuf(bp, bp->b_vp); | |
438 | else | |
439 | bp->b_flags |= B_INVAL; | |
440 | brelse(bp); | |
441 | } | |
442 | } | |
443 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
444 | panic("vinvalbuf: flush failed"); | |
445 | return (dirty); | |
446 | } | |
447 | ||
448 | /* | |
449 | * Associate a buffer with a vnode. | |
450 | */ | |
451 | bgetvp(vp, bp) | |
452 | register struct vnode *vp; | |
453 | register struct buf *bp; | |
454 | { | |
8136adfc KM |
455 | register struct vnode *vq; |
456 | register struct buf *bq; | |
76429560 KM |
457 | |
458 | if (bp->b_vp) | |
459 | panic("bgetvp: not free"); | |
460 | VHOLD(vp); | |
461 | bp->b_vp = vp; | |
462 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
463 | bp->b_dev = vp->v_rdev; | |
464 | else | |
465 | bp->b_dev = NODEV; | |
466 | /* | |
467 | * Insert onto list for new vnode. | |
468 | */ | |
8136adfc KM |
469 | if (bq = vp->v_cleanblkhd) |
470 | bq->b_blockb = &bp->b_blockf; | |
471 | bp->b_blockf = bq; | |
472 | bp->b_blockb = &vp->v_cleanblkhd; | |
473 | vp->v_cleanblkhd = bp; | |
76429560 KM |
474 | } |
475 | ||
476 | /* | |
477 | * Disassociate a buffer from a vnode. | |
478 | */ | |
479 | brelvp(bp) | |
480 | register struct buf *bp; | |
481 | { | |
482 | struct buf *bq; | |
483 | struct vnode *vp; | |
484 | ||
485 | if (bp->b_vp == (struct vnode *) 0) | |
486 | panic("brelvp: NULL"); | |
487 | /* | |
488 | * Delete from old vnode list, if on one. | |
489 | */ | |
490 | if (bp->b_blockb) { | |
491 | if (bq = bp->b_blockf) | |
492 | bq->b_blockb = bp->b_blockb; | |
493 | *bp->b_blockb = bq; | |
494 | bp->b_blockf = NULL; | |
495 | bp->b_blockb = NULL; | |
496 | } | |
497 | vp = bp->b_vp; | |
498 | bp->b_vp = (struct vnode *) 0; | |
499 | HOLDRELE(vp); | |
500 | } | |
501 | ||
502 | /* | |
503 | * Reassign a buffer from one vnode to another. | |
504 | * Used to assign file specific control information | |
505 | * (indirect blocks) to the vnode to which they belong. | |
506 | */ | |
507 | reassignbuf(bp, newvp) | |
508 | register struct buf *bp; | |
509 | register struct vnode *newvp; | |
510 | { | |
511 | register struct buf *bq, **listheadp; | |
512 | ||
e5c3f16e KM |
513 | if (newvp == NULL) { |
514 | printf("reassignbuf: NULL"); | |
515 | return; | |
516 | } | |
76429560 KM |
517 | /* |
518 | * Delete from old vnode list, if on one. | |
519 | */ | |
520 | if (bp->b_blockb) { | |
521 | if (bq = bp->b_blockf) | |
522 | bq->b_blockb = bp->b_blockb; | |
523 | *bp->b_blockb = bq; | |
524 | } | |
525 | /* | |
526 | * If dirty, put on list of dirty buffers; | |
527 | * otherwise insert onto list of clean buffers. | |
528 | */ | |
529 | if (bp->b_flags & B_DELWRI) | |
530 | listheadp = &newvp->v_dirtyblkhd; | |
531 | else | |
532 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
533 | if (bq = *listheadp) |
534 | bq->b_blockb = &bp->b_blockf; | |
535 | bp->b_blockf = bq; | |
536 | bp->b_blockb = listheadp; | |
537 | *listheadp = bp; | |
76429560 KM |
538 | } |
539 | ||
36d09cb1 | 540 | /* |
ef24f6dd KM |
541 | * Create a vnode for a block device. |
542 | * Used for root filesystem, argdev, and swap areas. | |
543 | * Also used for memory file system special devices. | |
544 | */ | |
545 | bdevvp(dev, vpp) | |
546 | dev_t dev; | |
547 | struct vnode **vpp; | |
548 | { | |
ef24f6dd KM |
549 | register struct vnode *vp; |
550 | struct vnode *nvp; | |
551 | int error; | |
552 | ||
1c89915d KM |
553 | if (dev == NODEV) |
554 | return (0); | |
4ef5d036 | 555 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
556 | if (error) { |
557 | *vpp = 0; | |
558 | return (error); | |
559 | } | |
560 | vp = nvp; | |
561 | vp->v_type = VBLK; | |
c0de8792 | 562 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
563 | vput(vp); |
564 | vp = nvp; | |
565 | } | |
566 | *vpp = vp; | |
567 | return (0); | |
568 | } | |
569 | ||
570 | /* | |
571 | * Check to see if the new vnode represents a special device | |
572 | * for which we already have a vnode (either because of | |
573 | * bdevvp() or because of a different vnode representing | |
574 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 575 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
576 | * caller is responsible for filling it with its new contents. |
577 | */ | |
578 | struct vnode * | |
c0de8792 | 579 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 580 | register struct vnode *nvp; |
c0de8792 | 581 | dev_t nvp_rdev; |
ef24f6dd KM |
582 | struct mount *mp; |
583 | { | |
584 | register struct vnode *vp; | |
c0de8792 | 585 | struct vnode **vpp; |
ef24f6dd KM |
586 | |
587 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 588 | return (NULLVP); |
c0de8792 KM |
589 | |
590 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 591 | loop: |
c0de8792 KM |
592 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
593 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 594 | continue; |
c0de8792 KM |
595 | /* |
596 | * Alias, but not in use, so flush it out. | |
597 | */ | |
7f7b7d89 | 598 | if (vp->v_usecount == 0) { |
c0de8792 KM |
599 | vgone(vp); |
600 | goto loop; | |
601 | } | |
ef62830d KM |
602 | if (vget(vp)) |
603 | goto loop; | |
ef24f6dd KM |
604 | break; |
605 | } | |
c0de8792 | 606 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
607 | MALLOC(nvp->v_specinfo, struct specinfo *, |
608 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
609 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 610 | nvp->v_hashchain = vpp; |
c0de8792 | 611 | nvp->v_specnext = *vpp; |
2c957a90 | 612 | nvp->v_specflags = 0; |
c0de8792 | 613 | *vpp = nvp; |
40452d5e KM |
614 | if (vp != NULL) { |
615 | nvp->v_flag |= VALIASED; | |
616 | vp->v_flag |= VALIASED; | |
617 | vput(vp); | |
618 | } | |
54fb9dc2 | 619 | return (NULLVP); |
ef24f6dd | 620 | } |
2bae1875 KM |
621 | VOP_UNLOCK(vp); |
622 | vclean(vp, 0); | |
ef24f6dd KM |
623 | vp->v_op = nvp->v_op; |
624 | vp->v_tag = nvp->v_tag; | |
625 | nvp->v_type = VNON; | |
626 | insmntque(vp, mp); | |
627 | return (vp); | |
628 | } | |
629 | ||
630 | /* | |
631 | * Grab a particular vnode from the free list, increment its | |
632 | * reference count and lock it. The vnode lock bit is set the | |
633 | * vnode is being eliminated in vgone. The process is awakened | |
634 | * when the transition is completed, and an error returned to | |
635 | * indicate that the vnode is no longer usable (possibly having | |
636 | * been changed to a new file system type). | |
36d09cb1 KM |
637 | */ |
638 | vget(vp) | |
639 | register struct vnode *vp; | |
640 | { | |
641 | register struct vnode *vq; | |
642 | ||
ef24f6dd KM |
643 | if (vp->v_flag & VXLOCK) { |
644 | vp->v_flag |= VXWANT; | |
645 | sleep((caddr_t)vp, PINOD); | |
646 | return (1); | |
647 | } | |
7f7b7d89 | 648 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
649 | if (vq = vp->v_freef) |
650 | vq->v_freeb = vp->v_freeb; | |
651 | else | |
652 | vfreet = vp->v_freeb; | |
653 | *vp->v_freeb = vq; | |
654 | vp->v_freef = NULL; | |
655 | vp->v_freeb = NULL; | |
656 | } | |
36d09cb1 | 657 | VREF(vp); |
ef24f6dd KM |
658 | VOP_LOCK(vp); |
659 | return (0); | |
36d09cb1 KM |
660 | } |
661 | ||
d32390ea KM |
662 | int bug_refs = 0; |
663 | ||
36d09cb1 KM |
664 | /* |
665 | * Vnode reference, just increment the count | |
666 | */ | |
667 | void vref(vp) | |
668 | struct vnode *vp; | |
669 | { | |
670 | ||
7f7b7d89 | 671 | vp->v_usecount++; |
d32390ea KM |
672 | if (vp->v_type != VBLK && curproc) |
673 | curproc->p_spare[0]++; | |
674 | if (bug_refs) | |
675 | vprint("vref: "); | |
36d09cb1 KM |
676 | } |
677 | ||
678 | /* | |
679 | * vput(), just unlock and vrele() | |
680 | */ | |
681 | void vput(vp) | |
682 | register struct vnode *vp; | |
683 | { | |
4d1ee2eb | 684 | |
36d09cb1 KM |
685 | VOP_UNLOCK(vp); |
686 | vrele(vp); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Vnode release. | |
691 | * If count drops to zero, call inactive routine and return to freelist. | |
692 | */ | |
693 | void vrele(vp) | |
694 | register struct vnode *vp; | |
695 | { | |
c099667a | 696 | struct proc *p = curproc; /* XXX */ |
36d09cb1 | 697 | |
65c3b3a8 | 698 | #ifdef DIAGNOSTIC |
36d09cb1 | 699 | if (vp == NULL) |
ef24f6dd | 700 | panic("vrele: null vp"); |
65c3b3a8 | 701 | #endif |
7f7b7d89 | 702 | vp->v_usecount--; |
d32390ea KM |
703 | if (vp->v_type != VBLK && curproc) |
704 | curproc->p_spare[0]--; | |
705 | if (bug_refs) | |
706 | vprint("vref: "); | |
7f7b7d89 | 707 | if (vp->v_usecount > 0) |
36d09cb1 | 708 | return; |
65c3b3a8 KM |
709 | #ifdef DIAGNOSTIC |
710 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
711 | vprint("vrele: bad ref count", vp); | |
712 | panic("vrele: ref cnt"); | |
713 | } | |
714 | #endif | |
54fb9dc2 | 715 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
716 | /* |
717 | * insert into empty list | |
718 | */ | |
719 | vfreeh = vp; | |
720 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
721 | } else { |
722 | /* | |
723 | * insert at tail of list | |
724 | */ | |
725 | *vfreet = vp; | |
726 | vp->v_freeb = vfreet; | |
36d09cb1 | 727 | } |
ef24f6dd KM |
728 | vp->v_freef = NULL; |
729 | vfreet = &vp->v_freef; | |
c099667a | 730 | VOP_INACTIVE(vp, p); |
ef24f6dd KM |
731 | } |
732 | ||
7f7b7d89 KM |
733 | /* |
734 | * Page or buffer structure gets a reference. | |
735 | */ | |
736 | vhold(vp) | |
737 | register struct vnode *vp; | |
738 | { | |
739 | ||
740 | vp->v_holdcnt++; | |
741 | } | |
742 | ||
743 | /* | |
744 | * Page or buffer structure frees a reference. | |
745 | */ | |
746 | holdrele(vp) | |
747 | register struct vnode *vp; | |
748 | { | |
749 | ||
750 | if (vp->v_holdcnt <= 0) | |
751 | panic("holdrele: holdcnt"); | |
752 | vp->v_holdcnt--; | |
753 | } | |
754 | ||
f0556f86 KM |
755 | /* |
756 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
757 | * | |
758 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
759 | * return error if any are found (nb: this is a user error, not a | |
760 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
761 | * that are found. | |
762 | */ | |
763 | int busyprt = 0; /* patch to print out busy vnodes */ | |
764 | ||
765 | vflush(mp, skipvp, flags) | |
766 | struct mount *mp; | |
767 | struct vnode *skipvp; | |
768 | int flags; | |
769 | { | |
770 | register struct vnode *vp, *nvp; | |
771 | int busy = 0; | |
772 | ||
54fb9dc2 | 773 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 774 | panic("vflush: not busy"); |
4597dd33 | 775 | loop: |
54fb9dc2 | 776 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
777 | if (vp->v_mount != mp) |
778 | goto loop; | |
f0556f86 KM |
779 | nvp = vp->v_mountf; |
780 | /* | |
781 | * Skip over a selected vnode. | |
f0556f86 KM |
782 | */ |
783 | if (vp == skipvp) | |
784 | continue; | |
36ef03ec KM |
785 | /* |
786 | * Skip over a vnodes marked VSYSTEM. | |
787 | */ | |
788 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
789 | continue; | |
f0556f86 | 790 | /* |
7f7b7d89 | 791 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
792 | * out the vnode data structures and we are done. |
793 | */ | |
7f7b7d89 | 794 | if (vp->v_usecount == 0) { |
f0556f86 KM |
795 | vgone(vp); |
796 | continue; | |
797 | } | |
798 | /* | |
799 | * For block or character devices, revert to an | |
800 | * anonymous device. For all other files, just kill them. | |
801 | */ | |
36ef03ec | 802 | if (flags & FORCECLOSE) { |
f0556f86 KM |
803 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
804 | vgone(vp); | |
805 | } else { | |
806 | vclean(vp, 0); | |
807 | vp->v_op = &spec_vnodeops; | |
808 | insmntque(vp, (struct mount *)0); | |
809 | } | |
810 | continue; | |
811 | } | |
812 | if (busyprt) | |
0bf84b18 | 813 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
814 | busy++; |
815 | } | |
816 | if (busy) | |
817 | return (EBUSY); | |
818 | return (0); | |
819 | } | |
820 | ||
ef24f6dd KM |
821 | /* |
822 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 823 | */ |
36ef03ec | 824 | void vclean(vp, flags) |
ef24f6dd | 825 | register struct vnode *vp; |
aacc1bff | 826 | int flags; |
ef24f6dd KM |
827 | { |
828 | struct vnodeops *origops; | |
2bae1875 | 829 | int active; |
c099667a | 830 | struct proc *p = curproc; /* XXX */ |
ef24f6dd | 831 | |
2bae1875 KM |
832 | /* |
833 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
834 | * If so we have to reference it before we clean it out |
835 | * so that its count cannot fall to zero and generate a | |
836 | * race against ourselves to recycle it. | |
2bae1875 | 837 | */ |
7f7b7d89 | 838 | if (active = vp->v_usecount) |
2bae1875 | 839 | VREF(vp); |
2bae1875 KM |
840 | /* |
841 | * Prevent the vnode from being recycled or | |
842 | * brought into use while we clean it out. | |
843 | */ | |
0bf84b18 KM |
844 | if (vp->v_flag & VXLOCK) |
845 | panic("vclean: deadlock"); | |
ef24f6dd | 846 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
847 | /* |
848 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
849 | * have the object locked while it cleans it out. The VOP_LOCK | |
850 | * ensures that the VOP_INACTIVE routine is done with its work. | |
851 | * For active vnodes, it ensures that no other activity can | |
852 | * occur while the buffer list is being cleaned out. | |
853 | */ | |
854 | VOP_LOCK(vp); | |
36ef03ec | 855 | if (flags & DOCLOSE) |
0bf84b18 | 856 | vinvalbuf(vp, 1); |
ef24f6dd KM |
857 | /* |
858 | * Prevent any further operations on the vnode from | |
859 | * being passed through to the old file system. | |
860 | */ | |
861 | origops = vp->v_op; | |
862 | vp->v_op = &dead_vnodeops; | |
863 | vp->v_tag = VT_NON; | |
864 | /* | |
2bae1875 KM |
865 | * If purging an active vnode, it must be unlocked, closed, |
866 | * and deactivated before being reclaimed. | |
ef24f6dd | 867 | */ |
20454d5a | 868 | (*(origops->vop_unlock))(vp); |
2bae1875 | 869 | if (active) { |
36ef03ec | 870 | if (flags & DOCLOSE) |
20454d5a KM |
871 | (*(origops->vop_close))(vp, IO_NDELAY, NOCRED, p); |
872 | (*(origops->vop_inactive))(vp, p); | |
ef24f6dd KM |
873 | } |
874 | /* | |
875 | * Reclaim the vnode. | |
876 | */ | |
20454d5a | 877 | if ((*(origops->vop_reclaim))(vp)) |
ef24f6dd | 878 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
879 | if (active) |
880 | vrele(vp); | |
ef24f6dd KM |
881 | /* |
882 | * Done with purge, notify sleepers in vget of the grim news. | |
883 | */ | |
884 | vp->v_flag &= ~VXLOCK; | |
885 | if (vp->v_flag & VXWANT) { | |
886 | vp->v_flag &= ~VXWANT; | |
887 | wakeup((caddr_t)vp); | |
888 | } | |
889 | } | |
890 | ||
ef62830d KM |
891 | /* |
892 | * Eliminate all activity associated with the requested vnode | |
893 | * and with all vnodes aliased to the requested vnode. | |
894 | */ | |
895 | void vgoneall(vp) | |
896 | register struct vnode *vp; | |
897 | { | |
7f7b7d89 | 898 | register struct vnode *vq; |
ef62830d | 899 | |
7a7b3a95 KM |
900 | if (vp->v_flag & VALIASED) { |
901 | /* | |
902 | * If a vgone (or vclean) is already in progress, | |
903 | * wait until it is done and return. | |
904 | */ | |
905 | if (vp->v_flag & VXLOCK) { | |
906 | vp->v_flag |= VXWANT; | |
907 | sleep((caddr_t)vp, PINOD); | |
908 | return; | |
909 | } | |
910 | /* | |
911 | * Ensure that vp will not be vgone'd while we | |
912 | * are eliminating its aliases. | |
913 | */ | |
914 | vp->v_flag |= VXLOCK; | |
915 | while (vp->v_flag & VALIASED) { | |
916 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
917 | if (vq->v_rdev != vp->v_rdev || | |
918 | vq->v_type != vp->v_type || vp == vq) | |
919 | continue; | |
920 | vgone(vq); | |
921 | break; | |
922 | } | |
ef62830d | 923 | } |
7a7b3a95 KM |
924 | /* |
925 | * Remove the lock so that vgone below will | |
926 | * really eliminate the vnode after which time | |
927 | * vgone will awaken any sleepers. | |
928 | */ | |
929 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
930 | } |
931 | vgone(vp); | |
932 | } | |
933 | ||
ef24f6dd KM |
934 | /* |
935 | * Eliminate all activity associated with a vnode | |
936 | * in preparation for reuse. | |
937 | */ | |
938 | void vgone(vp) | |
939 | register struct vnode *vp; | |
940 | { | |
7f7b7d89 | 941 | register struct vnode *vq; |
c0de8792 | 942 | struct vnode *vx; |
ef24f6dd | 943 | |
4f55e3ec KM |
944 | /* |
945 | * If a vgone (or vclean) is already in progress, | |
946 | * wait until it is done and return. | |
947 | */ | |
948 | if (vp->v_flag & VXLOCK) { | |
949 | vp->v_flag |= VXWANT; | |
950 | sleep((caddr_t)vp, PINOD); | |
951 | return; | |
952 | } | |
ef24f6dd KM |
953 | /* |
954 | * Clean out the filesystem specific data. | |
955 | */ | |
36ef03ec | 956 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
957 | /* |
958 | * Delete from old mount point vnode list, if on one. | |
959 | */ | |
960 | if (vp->v_mountb) { | |
961 | if (vq = vp->v_mountf) | |
962 | vq->v_mountb = vp->v_mountb; | |
963 | *vp->v_mountb = vq; | |
964 | vp->v_mountf = NULL; | |
965 | vp->v_mountb = NULL; | |
d10e9258 | 966 | vp->v_mount = NULL; |
ef24f6dd KM |
967 | } |
968 | /* | |
969 | * If special device, remove it from special device alias list. | |
970 | */ | |
971 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
972 | if (*vp->v_hashchain == vp) { |
973 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 974 | } else { |
7f7b7d89 | 975 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 976 | if (vq->v_specnext != vp) |
ef24f6dd | 977 | continue; |
c0de8792 | 978 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
979 | break; |
980 | } | |
c0de8792 | 981 | if (vq == NULL) |
ef24f6dd KM |
982 | panic("missing bdev"); |
983 | } | |
c0de8792 | 984 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 985 | vx = NULL; |
7f7b7d89 | 986 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
987 | if (vq->v_rdev != vp->v_rdev || |
988 | vq->v_type != vp->v_type) | |
c0de8792 | 989 | continue; |
4d1ee2eb CT |
990 | if (vx) |
991 | break; | |
c0de8792 KM |
992 | vx = vq; |
993 | } | |
4d1ee2eb | 994 | if (vx == NULL) |
c0de8792 | 995 | panic("missing alias"); |
4d1ee2eb | 996 | if (vq == NULL) |
c0de8792 KM |
997 | vx->v_flag &= ~VALIASED; |
998 | vp->v_flag &= ~VALIASED; | |
999 | } | |
1000 | FREE(vp->v_specinfo, M_VNODE); | |
1001 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
1002 | } |
1003 | /* | |
1004 | * If it is on the freelist, move it to the head of the list. | |
1005 | */ | |
1006 | if (vp->v_freeb) { | |
1007 | if (vq = vp->v_freef) | |
1008 | vq->v_freeb = vp->v_freeb; | |
1009 | else | |
1010 | vfreet = vp->v_freeb; | |
1011 | *vp->v_freeb = vq; | |
1012 | vp->v_freef = vfreeh; | |
1013 | vp->v_freeb = &vfreeh; | |
1014 | vfreeh->v_freeb = &vp->v_freef; | |
1015 | vfreeh = vp; | |
1016 | } | |
2bae1875 | 1017 | vp->v_type = VBAD; |
36d09cb1 | 1018 | } |
ef62830d | 1019 | |
2bcd6066 KM |
1020 | /* |
1021 | * Lookup a vnode by device number. | |
1022 | */ | |
1023 | vfinddev(dev, type, vpp) | |
1024 | dev_t dev; | |
1025 | enum vtype type; | |
1026 | struct vnode **vpp; | |
1027 | { | |
1028 | register struct vnode *vp; | |
1029 | ||
1030 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
1031 | if (dev != vp->v_rdev || type != vp->v_type) | |
1032 | continue; | |
1033 | *vpp = vp; | |
1034 | return (0); | |
1035 | } | |
1036 | return (1); | |
1037 | } | |
1038 | ||
ef62830d KM |
1039 | /* |
1040 | * Calculate the total number of references to a special device. | |
1041 | */ | |
1042 | vcount(vp) | |
1043 | register struct vnode *vp; | |
1044 | { | |
7f7b7d89 | 1045 | register struct vnode *vq; |
ef62830d KM |
1046 | int count; |
1047 | ||
1048 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 1049 | return (vp->v_usecount); |
ef62830d | 1050 | loop: |
7f7b7d89 | 1051 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 1052 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1053 | continue; |
1054 | /* | |
1055 | * Alias, but not in use, so flush it out. | |
1056 | */ | |
7f7b7d89 | 1057 | if (vq->v_usecount == 0) { |
ef62830d KM |
1058 | vgone(vq); |
1059 | goto loop; | |
1060 | } | |
7f7b7d89 | 1061 | count += vq->v_usecount; |
ef62830d KM |
1062 | } |
1063 | return (count); | |
1064 | } | |
0bf84b18 KM |
1065 | |
1066 | /* | |
1067 | * Print out a description of a vnode. | |
1068 | */ | |
1069 | static char *typename[] = | |
61f846a8 | 1070 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1071 | |
1072 | vprint(label, vp) | |
1073 | char *label; | |
1074 | register struct vnode *vp; | |
1075 | { | |
f2f730c6 | 1076 | char buf[64]; |
0bf84b18 KM |
1077 | |
1078 | if (label != NULL) | |
1079 | printf("%s: ", label); | |
65c3b3a8 KM |
1080 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1081 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1082 | vp->v_holdcnt); | |
f2f730c6 KM |
1083 | buf[0] = '\0'; |
1084 | if (vp->v_flag & VROOT) | |
1085 | strcat(buf, "|VROOT"); | |
1086 | if (vp->v_flag & VTEXT) | |
1087 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1088 | if (vp->v_flag & VSYSTEM) |
1089 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1090 | if (vp->v_flag & VXLOCK) |
1091 | strcat(buf, "|VXLOCK"); | |
1092 | if (vp->v_flag & VXWANT) | |
1093 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1094 | if (vp->v_flag & VBWAIT) |
1095 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1096 | if (vp->v_flag & VALIASED) |
1097 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1098 | if (buf[0] != '\0') |
1099 | printf(" flags (%s)", &buf[1]); | |
1100 | printf("\n\t"); | |
0bf84b18 KM |
1101 | VOP_PRINT(vp); |
1102 | } | |
985cbdd5 | 1103 | |
34c62e18 KM |
1104 | #ifdef DEBUG |
1105 | /* | |
1106 | * List all of the locked vnodes in the system. | |
1107 | * Called when debugging the kernel. | |
1108 | */ | |
1109 | printlockedvnodes() | |
1110 | { | |
1111 | register struct mount *mp; | |
1112 | register struct vnode *vp; | |
1113 | ||
1114 | printf("Locked vnodes\n"); | |
1115 | mp = rootfs; | |
1116 | do { | |
1117 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1118 | if (VOP_ISLOCKED(vp)) | |
1119 | vprint((char *)0, vp); | |
1120 | mp = mp->mnt_next; | |
1121 | } while (mp != rootfs); | |
1122 | } | |
1123 | #endif | |
1124 | ||
985cbdd5 MT |
1125 | int kinfo_vdebug = 1; |
1126 | int kinfo_vgetfailed; | |
1127 | #define KINFO_VNODESLOP 10 | |
1128 | /* | |
1129 | * Dump vnode list (via kinfo). | |
1130 | * Copyout address of vnode followed by vnode. | |
1131 | */ | |
aacc1bff | 1132 | /* ARGSUSED */ |
985cbdd5 | 1133 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1134 | int op; |
985cbdd5 | 1135 | char *where; |
aacc1bff | 1136 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1137 | { |
1138 | register struct mount *mp = rootfs; | |
36ef03ec | 1139 | struct mount *omp; |
985cbdd5 | 1140 | struct vnode *vp; |
985cbdd5 MT |
1141 | register char *bp = where, *savebp; |
1142 | char *ewhere = where + *acopysize; | |
1143 | int error; | |
1144 | ||
1145 | #define VPTRSZ sizeof (struct vnode *) | |
1146 | #define VNODESZ sizeof (struct vnode) | |
1147 | if (where == NULL) { | |
1148 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1149 | return (0); | |
1150 | } | |
1151 | ||
985cbdd5 | 1152 | do { |
36ef03ec | 1153 | if (vfs_busy(mp)) { |
54fb9dc2 | 1154 | mp = mp->mnt_next; |
36ef03ec KM |
1155 | continue; |
1156 | } | |
985cbdd5 MT |
1157 | savebp = bp; |
1158 | again: | |
4597dd33 | 1159 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1160 | /* |
1161 | * Check that the vp is still associated with | |
1162 | * this filesystem. RACE: could have been | |
1163 | * recycled onto the same filesystem. | |
1164 | */ | |
4597dd33 KM |
1165 | if (vp->v_mount != mp) { |
1166 | if (kinfo_vdebug) | |
1167 | printf("kinfo: vp changed\n"); | |
1168 | bp = savebp; | |
1169 | goto again; | |
1170 | } | |
985cbdd5 MT |
1171 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1172 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1173 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1174 | VNODESZ)))) |
985cbdd5 | 1175 | return (error); |
985cbdd5 | 1176 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1177 | } |
36ef03ec | 1178 | omp = mp; |
54fb9dc2 | 1179 | mp = mp->mnt_next; |
36ef03ec | 1180 | vfs_unbusy(omp); |
985cbdd5 MT |
1181 | } while (mp != rootfs); |
1182 | ||
1183 | *aneeded = bp - where; | |
1184 | if (bp > ewhere) | |
1185 | *acopysize = ewhere - where; | |
1186 | else | |
1187 | *acopysize = bp - where; | |
1188 | return (0); | |
1189 | } |