Commit | Line | Data |
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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 | * |
ea67b335 | 7 | * @(#)vfs_subr.c 7.73 (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; | |
953f3c9e JH |
167 | extern struct vnodeops dead_vnodeops; |
168 | extern struct vnodeops spec_vnodeops; | |
32339c94 | 169 | extern void vclean(); |
1a80f56e | 170 | long numvnodes; |
d3664d8f | 171 | struct vattr va_null; |
c0de8792 | 172 | |
36d09cb1 | 173 | /* |
ef24f6dd | 174 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 175 | */ |
ef24f6dd | 176 | vfsinit() |
36d09cb1 | 177 | { |
ef24f6dd | 178 | struct vfsops **vfsp; |
36d09cb1 | 179 | |
ef24f6dd KM |
180 | /* |
181 | * Initialize the vnode name cache | |
182 | */ | |
183 | nchinit(); | |
184 | /* | |
185 | * Initialize each file system type. | |
186 | */ | |
d3664d8f | 187 | vattr_null(&va_null); |
ef24f6dd KM |
188 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
189 | if (*vfsp == NULL) | |
190 | continue; | |
191 | (*(*vfsp)->vfs_init)(); | |
192 | } | |
36d09cb1 KM |
193 | } |
194 | ||
195 | /* | |
196 | * Return the next vnode from the free list. | |
197 | */ | |
198 | getnewvnode(tag, mp, vops, vpp) | |
199 | enum vtagtype tag; | |
200 | struct mount *mp; | |
201 | struct vnodeops *vops; | |
202 | struct vnode **vpp; | |
203 | { | |
204 | register struct vnode *vp, *vq; | |
205 | ||
1a80f56e | 206 | if (numvnodes < desiredvnodes) { |
aacc1bff KM |
207 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
208 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
209 | bzero((char *)vp, sizeof *vp); |
210 | numvnodes++; | |
211 | } else { | |
212 | if ((vp = vfreeh) == NULL) { | |
213 | tablefull("vnode"); | |
214 | *vpp = 0; | |
215 | return (ENFILE); | |
216 | } | |
217 | if (vp->v_usecount) | |
218 | panic("free vnode isn't"); | |
219 | if (vq = vp->v_freef) | |
220 | vq->v_freeb = &vfreeh; | |
221 | else | |
222 | vfreet = &vfreeh; | |
223 | vfreeh = vq; | |
224 | vp->v_freef = NULL; | |
225 | vp->v_freeb = NULL; | |
39b99eb6 | 226 | vp->v_lease = NULL; |
1a80f56e KM |
227 | if (vp->v_type != VBAD) |
228 | vgone(vp); | |
2345b093 KM |
229 | if (vp->v_data) |
230 | panic("cleaned vnode isn't"); | |
1a80f56e | 231 | vp->v_flag = 0; |
1a80f56e KM |
232 | vp->v_lastr = 0; |
233 | vp->v_socket = 0; | |
36d09cb1 | 234 | } |
b027498b | 235 | vp->v_type = VNON; |
36d09cb1 KM |
236 | cache_purge(vp); |
237 | vp->v_tag = tag; | |
ef24f6dd | 238 | vp->v_op = vops; |
36d09cb1 KM |
239 | insmntque(vp, mp); |
240 | VREF(vp); | |
241 | *vpp = vp; | |
242 | return (0); | |
243 | } | |
244 | ||
245 | /* | |
246 | * Move a vnode from one mount queue to another. | |
247 | */ | |
248 | insmntque(vp, mp) | |
249 | register struct vnode *vp; | |
250 | register struct mount *mp; | |
251 | { | |
8136adfc | 252 | register struct vnode *vq; |
36d09cb1 KM |
253 | |
254 | /* | |
255 | * Delete from old mount point vnode list, if on one. | |
256 | */ | |
257 | if (vp->v_mountb) { | |
258 | if (vq = vp->v_mountf) | |
259 | vq->v_mountb = vp->v_mountb; | |
260 | *vp->v_mountb = vq; | |
261 | } | |
262 | /* | |
263 | * Insert into list of vnodes for the new mount point, if available. | |
264 | */ | |
a45ff315 | 265 | vp->v_mount = mp; |
36d09cb1 KM |
266 | if (mp == NULL) { |
267 | vp->v_mountf = NULL; | |
268 | vp->v_mountb = NULL; | |
269 | return; | |
270 | } | |
8136adfc KM |
271 | if (vq = mp->mnt_mounth) |
272 | vq->v_mountb = &vp->v_mountf; | |
273 | vp->v_mountf = vq; | |
274 | vp->v_mountb = &mp->mnt_mounth; | |
275 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
276 | } |
277 | ||
76429560 KM |
278 | /* |
279 | * Make sure all write-behind blocks associated | |
280 | * with mount point are flushed out (from sync). | |
281 | */ | |
282 | mntflushbuf(mountp, flags) | |
283 | struct mount *mountp; | |
284 | int flags; | |
285 | { | |
286 | register struct vnode *vp; | |
287 | ||
288 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
289 | panic("mntflushbuf: not busy"); | |
290 | loop: | |
291 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
292 | if (VOP_ISLOCKED(vp)) | |
293 | continue; | |
294 | if (vget(vp)) | |
295 | goto loop; | |
296 | vflushbuf(vp, flags); | |
297 | vput(vp); | |
298 | if (vp->v_mount != mountp) | |
299 | goto loop; | |
300 | } | |
301 | } | |
302 | ||
303 | /* | |
304 | * Flush all dirty buffers associated with a vnode. | |
305 | */ | |
306 | vflushbuf(vp, flags) | |
307 | register struct vnode *vp; | |
308 | int flags; | |
309 | { | |
310 | register struct buf *bp; | |
311 | struct buf *nbp; | |
312 | int s; | |
313 | ||
314 | loop: | |
315 | s = splbio(); | |
316 | for (bp = vp->v_dirtyblkhd; bp; bp = nbp) { | |
317 | nbp = bp->b_blockf; | |
318 | if ((bp->b_flags & B_BUSY)) | |
319 | continue; | |
320 | if ((bp->b_flags & B_DELWRI) == 0) | |
321 | panic("vflushbuf: not dirty"); | |
322 | bremfree(bp); | |
323 | bp->b_flags |= B_BUSY; | |
324 | splx(s); | |
325 | /* | |
326 | * Wait for I/O associated with indirect blocks to complete, | |
327 | * since there is no way to quickly wait for them below. | |
328 | * NB: This is really specific to ufs, but is done here | |
329 | * as it is easier and quicker. | |
330 | */ | |
77dc8a8c | 331 | if (bp->b_vp == vp || (flags & B_SYNC) == 0) |
76429560 | 332 | (void) bawrite(bp); |
77dc8a8c | 333 | else |
76429560 | 334 | (void) bwrite(bp); |
77dc8a8c | 335 | goto loop; |
76429560 KM |
336 | } |
337 | splx(s); | |
338 | if ((flags & B_SYNC) == 0) | |
339 | return; | |
340 | s = splbio(); | |
341 | while (vp->v_numoutput) { | |
342 | vp->v_flag |= VBWAIT; | |
343 | sleep((caddr_t)&vp->v_numoutput, PRIBIO + 1); | |
344 | } | |
345 | splx(s); | |
346 | if (vp->v_dirtyblkhd) { | |
347 | vprint("vflushbuf: dirty", vp); | |
348 | goto loop; | |
349 | } | |
350 | } | |
351 | ||
352 | /* | |
353 | * Update outstanding I/O count and do wakeup if requested. | |
354 | */ | |
355 | vwakeup(bp) | |
356 | register struct buf *bp; | |
357 | { | |
358 | register struct vnode *vp; | |
359 | ||
360 | bp->b_dirtyoff = bp->b_dirtyend = 0; | |
361 | if (vp = bp->b_vp) { | |
362 | vp->v_numoutput--; | |
363 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { | |
364 | if (vp->v_numoutput < 0) | |
365 | panic("vwakeup: neg numoutput"); | |
366 | vp->v_flag &= ~VBWAIT; | |
367 | wakeup((caddr_t)&vp->v_numoutput); | |
368 | } | |
369 | } | |
370 | } | |
371 | ||
372 | /* | |
373 | * Invalidate in core blocks belonging to closed or umounted filesystem | |
374 | * | |
375 | * Go through the list of vnodes associated with the file system; | |
376 | * for each vnode invalidate any buffers that it holds. Normally | |
377 | * this routine is preceeded by a bflush call, so that on a quiescent | |
378 | * filesystem there will be no dirty buffers when we are done. Binval | |
379 | * returns the count of dirty buffers when it is finished. | |
380 | */ | |
381 | mntinvalbuf(mountp) | |
382 | struct mount *mountp; | |
383 | { | |
384 | register struct vnode *vp; | |
385 | int dirty = 0; | |
386 | ||
387 | if ((mountp->mnt_flag & MNT_MPBUSY) == 0) | |
388 | panic("mntinvalbuf: not busy"); | |
389 | loop: | |
390 | for (vp = mountp->mnt_mounth; vp; vp = vp->v_mountf) { | |
391 | if (vget(vp)) | |
392 | goto loop; | |
393 | dirty += vinvalbuf(vp, 1); | |
394 | vput(vp); | |
395 | if (vp->v_mount != mountp) | |
396 | goto loop; | |
397 | } | |
398 | return (dirty); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Flush out and invalidate all buffers associated with a vnode. | |
403 | * Called with the underlying object locked. | |
404 | */ | |
405 | vinvalbuf(vp, save) | |
406 | register struct vnode *vp; | |
407 | int save; | |
408 | { | |
409 | register struct buf *bp; | |
410 | struct buf *nbp, *blist; | |
411 | int s, dirty = 0; | |
412 | ||
413 | for (;;) { | |
414 | if (blist = vp->v_dirtyblkhd) | |
415 | /* void */; | |
416 | else if (blist = vp->v_cleanblkhd) | |
417 | /* void */; | |
418 | else | |
419 | break; | |
420 | for (bp = blist; bp; bp = nbp) { | |
421 | nbp = bp->b_blockf; | |
422 | s = splbio(); | |
423 | if (bp->b_flags & B_BUSY) { | |
424 | bp->b_flags |= B_WANTED; | |
425 | sleep((caddr_t)bp, PRIBIO + 1); | |
426 | splx(s); | |
427 | break; | |
428 | } | |
429 | bremfree(bp); | |
430 | bp->b_flags |= B_BUSY; | |
431 | splx(s); | |
432 | if (save && (bp->b_flags & B_DELWRI)) { | |
24e9a81d KM |
433 | dirty++; |
434 | (void) VOP_BWRITE(bp); | |
76429560 KM |
435 | break; |
436 | } | |
437 | if (bp->b_vp != vp) | |
438 | reassignbuf(bp, bp->b_vp); | |
439 | else | |
440 | bp->b_flags |= B_INVAL; | |
441 | brelse(bp); | |
442 | } | |
443 | } | |
444 | if (vp->v_dirtyblkhd || vp->v_cleanblkhd) | |
445 | panic("vinvalbuf: flush failed"); | |
446 | return (dirty); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Associate a buffer with a vnode. | |
451 | */ | |
452 | bgetvp(vp, bp) | |
453 | register struct vnode *vp; | |
454 | register struct buf *bp; | |
455 | { | |
8136adfc KM |
456 | register struct vnode *vq; |
457 | register struct buf *bq; | |
76429560 KM |
458 | |
459 | if (bp->b_vp) | |
460 | panic("bgetvp: not free"); | |
461 | VHOLD(vp); | |
462 | bp->b_vp = vp; | |
463 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
464 | bp->b_dev = vp->v_rdev; | |
465 | else | |
466 | bp->b_dev = NODEV; | |
467 | /* | |
468 | * Insert onto list for new vnode. | |
469 | */ | |
8136adfc KM |
470 | if (bq = vp->v_cleanblkhd) |
471 | bq->b_blockb = &bp->b_blockf; | |
472 | bp->b_blockf = bq; | |
473 | bp->b_blockb = &vp->v_cleanblkhd; | |
474 | vp->v_cleanblkhd = bp; | |
76429560 KM |
475 | } |
476 | ||
477 | /* | |
478 | * Disassociate a buffer from a vnode. | |
479 | */ | |
480 | brelvp(bp) | |
481 | register struct buf *bp; | |
482 | { | |
483 | struct buf *bq; | |
484 | struct vnode *vp; | |
485 | ||
486 | if (bp->b_vp == (struct vnode *) 0) | |
487 | panic("brelvp: NULL"); | |
488 | /* | |
489 | * Delete from old vnode list, if on one. | |
490 | */ | |
491 | if (bp->b_blockb) { | |
492 | if (bq = bp->b_blockf) | |
493 | bq->b_blockb = bp->b_blockb; | |
494 | *bp->b_blockb = bq; | |
495 | bp->b_blockf = NULL; | |
496 | bp->b_blockb = NULL; | |
497 | } | |
498 | vp = bp->b_vp; | |
499 | bp->b_vp = (struct vnode *) 0; | |
500 | HOLDRELE(vp); | |
501 | } | |
502 | ||
503 | /* | |
504 | * Reassign a buffer from one vnode to another. | |
505 | * Used to assign file specific control information | |
506 | * (indirect blocks) to the vnode to which they belong. | |
507 | */ | |
508 | reassignbuf(bp, newvp) | |
509 | register struct buf *bp; | |
510 | register struct vnode *newvp; | |
511 | { | |
512 | register struct buf *bq, **listheadp; | |
513 | ||
e5c3f16e KM |
514 | if (newvp == NULL) { |
515 | printf("reassignbuf: NULL"); | |
516 | return; | |
517 | } | |
76429560 KM |
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 | } | |
526 | /* | |
527 | * If dirty, put on list of dirty buffers; | |
528 | * otherwise insert onto list of clean buffers. | |
529 | */ | |
530 | if (bp->b_flags & B_DELWRI) | |
531 | listheadp = &newvp->v_dirtyblkhd; | |
532 | else | |
533 | listheadp = &newvp->v_cleanblkhd; | |
8136adfc KM |
534 | if (bq = *listheadp) |
535 | bq->b_blockb = &bp->b_blockf; | |
536 | bp->b_blockf = bq; | |
537 | bp->b_blockb = listheadp; | |
538 | *listheadp = bp; | |
76429560 KM |
539 | } |
540 | ||
36d09cb1 | 541 | /* |
ef24f6dd KM |
542 | * Create a vnode for a block device. |
543 | * Used for root filesystem, argdev, and swap areas. | |
544 | * Also used for memory file system special devices. | |
545 | */ | |
546 | bdevvp(dev, vpp) | |
547 | dev_t dev; | |
548 | struct vnode **vpp; | |
549 | { | |
ef24f6dd KM |
550 | register struct vnode *vp; |
551 | struct vnode *nvp; | |
552 | int error; | |
553 | ||
1c89915d KM |
554 | if (dev == NODEV) |
555 | return (0); | |
4ef5d036 | 556 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
557 | if (error) { |
558 | *vpp = 0; | |
559 | return (error); | |
560 | } | |
561 | vp = nvp; | |
562 | vp->v_type = VBLK; | |
c0de8792 | 563 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
564 | vput(vp); |
565 | vp = nvp; | |
566 | } | |
567 | *vpp = vp; | |
568 | return (0); | |
569 | } | |
570 | ||
571 | /* | |
572 | * Check to see if the new vnode represents a special device | |
573 | * for which we already have a vnode (either because of | |
574 | * bdevvp() or because of a different vnode representing | |
575 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 576 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
577 | * caller is responsible for filling it with its new contents. |
578 | */ | |
579 | struct vnode * | |
c0de8792 | 580 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 581 | register struct vnode *nvp; |
c0de8792 | 582 | dev_t nvp_rdev; |
ef24f6dd KM |
583 | struct mount *mp; |
584 | { | |
585 | register struct vnode *vp; | |
c0de8792 | 586 | struct vnode **vpp; |
ef24f6dd KM |
587 | |
588 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 589 | return (NULLVP); |
c0de8792 KM |
590 | |
591 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 592 | loop: |
c0de8792 KM |
593 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
594 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 595 | continue; |
c0de8792 KM |
596 | /* |
597 | * Alias, but not in use, so flush it out. | |
598 | */ | |
7f7b7d89 | 599 | if (vp->v_usecount == 0) { |
c0de8792 KM |
600 | vgone(vp); |
601 | goto loop; | |
602 | } | |
ef62830d KM |
603 | if (vget(vp)) |
604 | goto loop; | |
ef24f6dd KM |
605 | break; |
606 | } | |
c0de8792 | 607 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
608 | MALLOC(nvp->v_specinfo, struct specinfo *, |
609 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
610 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 611 | nvp->v_hashchain = vpp; |
c0de8792 | 612 | nvp->v_specnext = *vpp; |
2c957a90 | 613 | nvp->v_specflags = 0; |
c0de8792 | 614 | *vpp = nvp; |
40452d5e KM |
615 | if (vp != NULL) { |
616 | nvp->v_flag |= VALIASED; | |
617 | vp->v_flag |= VALIASED; | |
618 | vput(vp); | |
619 | } | |
54fb9dc2 | 620 | return (NULLVP); |
ef24f6dd | 621 | } |
2bae1875 KM |
622 | VOP_UNLOCK(vp); |
623 | vclean(vp, 0); | |
ef24f6dd KM |
624 | vp->v_op = nvp->v_op; |
625 | vp->v_tag = nvp->v_tag; | |
626 | nvp->v_type = VNON; | |
627 | insmntque(vp, mp); | |
628 | return (vp); | |
629 | } | |
630 | ||
631 | /* | |
632 | * Grab a particular vnode from the free list, increment its | |
633 | * reference count and lock it. The vnode lock bit is set the | |
634 | * vnode is being eliminated in vgone. The process is awakened | |
635 | * when the transition is completed, and an error returned to | |
636 | * indicate that the vnode is no longer usable (possibly having | |
637 | * been changed to a new file system type). | |
36d09cb1 KM |
638 | */ |
639 | vget(vp) | |
640 | register struct vnode *vp; | |
641 | { | |
642 | register struct vnode *vq; | |
643 | ||
ef24f6dd KM |
644 | if (vp->v_flag & VXLOCK) { |
645 | vp->v_flag |= VXWANT; | |
646 | sleep((caddr_t)vp, PINOD); | |
647 | return (1); | |
648 | } | |
7f7b7d89 | 649 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
650 | if (vq = vp->v_freef) |
651 | vq->v_freeb = vp->v_freeb; | |
652 | else | |
653 | vfreet = vp->v_freeb; | |
654 | *vp->v_freeb = vq; | |
655 | vp->v_freef = NULL; | |
656 | vp->v_freeb = NULL; | |
657 | } | |
36d09cb1 | 658 | VREF(vp); |
ef24f6dd KM |
659 | VOP_LOCK(vp); |
660 | return (0); | |
36d09cb1 KM |
661 | } |
662 | ||
d32390ea KM |
663 | int bug_refs = 0; |
664 | ||
36d09cb1 KM |
665 | /* |
666 | * Vnode reference, just increment the count | |
667 | */ | |
668 | void vref(vp) | |
669 | struct vnode *vp; | |
670 | { | |
671 | ||
7f7b7d89 | 672 | vp->v_usecount++; |
d32390ea KM |
673 | if (vp->v_type != VBLK && curproc) |
674 | curproc->p_spare[0]++; | |
675 | if (bug_refs) | |
676 | vprint("vref: "); | |
36d09cb1 KM |
677 | } |
678 | ||
679 | /* | |
680 | * vput(), just unlock and vrele() | |
681 | */ | |
682 | void vput(vp) | |
683 | register struct vnode *vp; | |
684 | { | |
4d1ee2eb | 685 | |
36d09cb1 KM |
686 | VOP_UNLOCK(vp); |
687 | vrele(vp); | |
688 | } | |
689 | ||
690 | /* | |
691 | * Vnode release. | |
692 | * If count drops to zero, call inactive routine and return to freelist. | |
693 | */ | |
694 | void vrele(vp) | |
695 | register struct vnode *vp; | |
696 | { | |
c099667a | 697 | struct proc *p = curproc; /* XXX */ |
36d09cb1 | 698 | |
65c3b3a8 | 699 | #ifdef DIAGNOSTIC |
36d09cb1 | 700 | if (vp == NULL) |
ef24f6dd | 701 | panic("vrele: null vp"); |
65c3b3a8 | 702 | #endif |
7f7b7d89 | 703 | vp->v_usecount--; |
d32390ea KM |
704 | if (vp->v_type != VBLK && curproc) |
705 | curproc->p_spare[0]--; | |
706 | if (bug_refs) | |
707 | vprint("vref: "); | |
7f7b7d89 | 708 | if (vp->v_usecount > 0) |
36d09cb1 | 709 | return; |
65c3b3a8 KM |
710 | #ifdef DIAGNOSTIC |
711 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
712 | vprint("vrele: bad ref count", vp); | |
713 | panic("vrele: ref cnt"); | |
714 | } | |
715 | #endif | |
54fb9dc2 | 716 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
717 | /* |
718 | * insert into empty list | |
719 | */ | |
720 | vfreeh = vp; | |
721 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
722 | } else { |
723 | /* | |
724 | * insert at tail of list | |
725 | */ | |
726 | *vfreet = vp; | |
727 | vp->v_freeb = vfreet; | |
36d09cb1 | 728 | } |
ef24f6dd KM |
729 | vp->v_freef = NULL; |
730 | vfreet = &vp->v_freef; | |
c099667a | 731 | VOP_INACTIVE(vp, p); |
ef24f6dd KM |
732 | } |
733 | ||
7f7b7d89 KM |
734 | /* |
735 | * Page or buffer structure gets a reference. | |
736 | */ | |
451df175 | 737 | void vhold(vp) |
7f7b7d89 KM |
738 | register struct vnode *vp; |
739 | { | |
740 | ||
741 | vp->v_holdcnt++; | |
742 | } | |
743 | ||
744 | /* | |
745 | * Page or buffer structure frees a reference. | |
746 | */ | |
451df175 | 747 | void holdrele(vp) |
7f7b7d89 KM |
748 | register struct vnode *vp; |
749 | { | |
750 | ||
751 | if (vp->v_holdcnt <= 0) | |
752 | panic("holdrele: holdcnt"); | |
753 | vp->v_holdcnt--; | |
754 | } | |
755 | ||
f0556f86 KM |
756 | /* |
757 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
758 | * | |
759 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
760 | * return error if any are found (nb: this is a user error, not a | |
761 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
762 | * that are found. | |
763 | */ | |
764 | int busyprt = 0; /* patch to print out busy vnodes */ | |
765 | ||
766 | vflush(mp, skipvp, flags) | |
767 | struct mount *mp; | |
768 | struct vnode *skipvp; | |
769 | int flags; | |
770 | { | |
771 | register struct vnode *vp, *nvp; | |
772 | int busy = 0; | |
773 | ||
54fb9dc2 | 774 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 775 | panic("vflush: not busy"); |
4597dd33 | 776 | loop: |
54fb9dc2 | 777 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
778 | if (vp->v_mount != mp) |
779 | goto loop; | |
f0556f86 KM |
780 | nvp = vp->v_mountf; |
781 | /* | |
782 | * Skip over a selected vnode. | |
f0556f86 KM |
783 | */ |
784 | if (vp == skipvp) | |
785 | continue; | |
36ef03ec KM |
786 | /* |
787 | * Skip over a vnodes marked VSYSTEM. | |
788 | */ | |
789 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
790 | continue; | |
f0556f86 | 791 | /* |
7f7b7d89 | 792 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
793 | * out the vnode data structures and we are done. |
794 | */ | |
7f7b7d89 | 795 | if (vp->v_usecount == 0) { |
f0556f86 KM |
796 | vgone(vp); |
797 | continue; | |
798 | } | |
799 | /* | |
800 | * For block or character devices, revert to an | |
801 | * anonymous device. For all other files, just kill them. | |
802 | */ | |
36ef03ec | 803 | if (flags & FORCECLOSE) { |
f0556f86 KM |
804 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
805 | vgone(vp); | |
806 | } else { | |
807 | vclean(vp, 0); | |
808 | vp->v_op = &spec_vnodeops; | |
809 | insmntque(vp, (struct mount *)0); | |
810 | } | |
811 | continue; | |
812 | } | |
813 | if (busyprt) | |
0bf84b18 | 814 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
815 | busy++; |
816 | } | |
817 | if (busy) | |
818 | return (EBUSY); | |
819 | return (0); | |
820 | } | |
821 | ||
ef24f6dd KM |
822 | /* |
823 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 824 | */ |
36ef03ec | 825 | void vclean(vp, flags) |
ef24f6dd | 826 | register struct vnode *vp; |
aacc1bff | 827 | int flags; |
ef24f6dd KM |
828 | { |
829 | struct vnodeops *origops; | |
2bae1875 | 830 | int active; |
c099667a | 831 | struct proc *p = curproc; /* XXX */ |
ef24f6dd | 832 | |
2bae1875 KM |
833 | /* |
834 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
835 | * If so we have to reference it before we clean it out |
836 | * so that its count cannot fall to zero and generate a | |
837 | * race against ourselves to recycle it. | |
2bae1875 | 838 | */ |
7f7b7d89 | 839 | if (active = vp->v_usecount) |
2bae1875 | 840 | VREF(vp); |
2bae1875 KM |
841 | /* |
842 | * Prevent the vnode from being recycled or | |
843 | * brought into use while we clean it out. | |
844 | */ | |
0bf84b18 KM |
845 | if (vp->v_flag & VXLOCK) |
846 | panic("vclean: deadlock"); | |
ef24f6dd | 847 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
848 | /* |
849 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
850 | * have the object locked while it cleans it out. The VOP_LOCK | |
851 | * ensures that the VOP_INACTIVE routine is done with its work. | |
852 | * For active vnodes, it ensures that no other activity can | |
853 | * occur while the buffer list is being cleaned out. | |
854 | */ | |
855 | VOP_LOCK(vp); | |
36ef03ec | 856 | if (flags & DOCLOSE) |
0bf84b18 | 857 | vinvalbuf(vp, 1); |
ef24f6dd KM |
858 | /* |
859 | * Prevent any further operations on the vnode from | |
860 | * being passed through to the old file system. | |
861 | */ | |
862 | origops = vp->v_op; | |
863 | vp->v_op = &dead_vnodeops; | |
864 | vp->v_tag = VT_NON; | |
865 | /* | |
2bae1875 KM |
866 | * If purging an active vnode, it must be unlocked, closed, |
867 | * and deactivated before being reclaimed. | |
ef24f6dd | 868 | */ |
20454d5a | 869 | (*(origops->vop_unlock))(vp); |
2bae1875 | 870 | if (active) { |
36ef03ec | 871 | if (flags & DOCLOSE) |
20454d5a KM |
872 | (*(origops->vop_close))(vp, IO_NDELAY, NOCRED, p); |
873 | (*(origops->vop_inactive))(vp, p); | |
ef24f6dd KM |
874 | } |
875 | /* | |
876 | * Reclaim the vnode. | |
877 | */ | |
20454d5a | 878 | if ((*(origops->vop_reclaim))(vp)) |
ef24f6dd | 879 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
880 | if (active) |
881 | vrele(vp); | |
ef24f6dd KM |
882 | /* |
883 | * Done with purge, notify sleepers in vget of the grim news. | |
884 | */ | |
885 | vp->v_flag &= ~VXLOCK; | |
886 | if (vp->v_flag & VXWANT) { | |
887 | vp->v_flag &= ~VXWANT; | |
888 | wakeup((caddr_t)vp); | |
889 | } | |
890 | } | |
891 | ||
ef62830d KM |
892 | /* |
893 | * Eliminate all activity associated with the requested vnode | |
894 | * and with all vnodes aliased to the requested vnode. | |
895 | */ | |
896 | void vgoneall(vp) | |
897 | register struct vnode *vp; | |
898 | { | |
7f7b7d89 | 899 | register struct vnode *vq; |
ef62830d | 900 | |
7a7b3a95 KM |
901 | if (vp->v_flag & VALIASED) { |
902 | /* | |
903 | * If a vgone (or vclean) is already in progress, | |
904 | * wait until it is done and return. | |
905 | */ | |
906 | if (vp->v_flag & VXLOCK) { | |
907 | vp->v_flag |= VXWANT; | |
908 | sleep((caddr_t)vp, PINOD); | |
909 | return; | |
910 | } | |
911 | /* | |
912 | * Ensure that vp will not be vgone'd while we | |
913 | * are eliminating its aliases. | |
914 | */ | |
915 | vp->v_flag |= VXLOCK; | |
916 | while (vp->v_flag & VALIASED) { | |
917 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
918 | if (vq->v_rdev != vp->v_rdev || | |
919 | vq->v_type != vp->v_type || vp == vq) | |
920 | continue; | |
921 | vgone(vq); | |
922 | break; | |
923 | } | |
ef62830d | 924 | } |
7a7b3a95 KM |
925 | /* |
926 | * Remove the lock so that vgone below will | |
927 | * really eliminate the vnode after which time | |
928 | * vgone will awaken any sleepers. | |
929 | */ | |
930 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
931 | } |
932 | vgone(vp); | |
933 | } | |
934 | ||
ef24f6dd KM |
935 | /* |
936 | * Eliminate all activity associated with a vnode | |
937 | * in preparation for reuse. | |
938 | */ | |
939 | void vgone(vp) | |
940 | register struct vnode *vp; | |
941 | { | |
7f7b7d89 | 942 | register struct vnode *vq; |
c0de8792 | 943 | struct vnode *vx; |
ef24f6dd | 944 | |
4f55e3ec KM |
945 | /* |
946 | * If a vgone (or vclean) is already in progress, | |
947 | * wait until it is done and return. | |
948 | */ | |
949 | if (vp->v_flag & VXLOCK) { | |
950 | vp->v_flag |= VXWANT; | |
951 | sleep((caddr_t)vp, PINOD); | |
952 | return; | |
953 | } | |
ef24f6dd KM |
954 | /* |
955 | * Clean out the filesystem specific data. | |
956 | */ | |
36ef03ec | 957 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
958 | /* |
959 | * Delete from old mount point vnode list, if on one. | |
960 | */ | |
961 | if (vp->v_mountb) { | |
962 | if (vq = vp->v_mountf) | |
963 | vq->v_mountb = vp->v_mountb; | |
964 | *vp->v_mountb = vq; | |
965 | vp->v_mountf = NULL; | |
966 | vp->v_mountb = NULL; | |
d10e9258 | 967 | vp->v_mount = NULL; |
ef24f6dd KM |
968 | } |
969 | /* | |
970 | * If special device, remove it from special device alias list. | |
971 | */ | |
972 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
973 | if (*vp->v_hashchain == vp) { |
974 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 975 | } else { |
7f7b7d89 | 976 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 977 | if (vq->v_specnext != vp) |
ef24f6dd | 978 | continue; |
c0de8792 | 979 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
980 | break; |
981 | } | |
c0de8792 | 982 | if (vq == NULL) |
ef24f6dd KM |
983 | panic("missing bdev"); |
984 | } | |
c0de8792 | 985 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 986 | vx = NULL; |
7f7b7d89 | 987 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
988 | if (vq->v_rdev != vp->v_rdev || |
989 | vq->v_type != vp->v_type) | |
c0de8792 | 990 | continue; |
4d1ee2eb CT |
991 | if (vx) |
992 | break; | |
c0de8792 KM |
993 | vx = vq; |
994 | } | |
4d1ee2eb | 995 | if (vx == NULL) |
c0de8792 | 996 | panic("missing alias"); |
4d1ee2eb | 997 | if (vq == NULL) |
c0de8792 KM |
998 | vx->v_flag &= ~VALIASED; |
999 | vp->v_flag &= ~VALIASED; | |
1000 | } | |
1001 | FREE(vp->v_specinfo, M_VNODE); | |
1002 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
1003 | } |
1004 | /* | |
1005 | * If it is on the freelist, move it to the head of the list. | |
1006 | */ | |
1007 | if (vp->v_freeb) { | |
1008 | if (vq = vp->v_freef) | |
1009 | vq->v_freeb = vp->v_freeb; | |
1010 | else | |
1011 | vfreet = vp->v_freeb; | |
1012 | *vp->v_freeb = vq; | |
1013 | vp->v_freef = vfreeh; | |
1014 | vp->v_freeb = &vfreeh; | |
1015 | vfreeh->v_freeb = &vp->v_freef; | |
1016 | vfreeh = vp; | |
1017 | } | |
2bae1875 | 1018 | vp->v_type = VBAD; |
36d09cb1 | 1019 | } |
ef62830d | 1020 | |
2bcd6066 KM |
1021 | /* |
1022 | * Lookup a vnode by device number. | |
1023 | */ | |
1024 | vfinddev(dev, type, vpp) | |
1025 | dev_t dev; | |
1026 | enum vtype type; | |
1027 | struct vnode **vpp; | |
1028 | { | |
1029 | register struct vnode *vp; | |
1030 | ||
1031 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
1032 | if (dev != vp->v_rdev || type != vp->v_type) | |
1033 | continue; | |
1034 | *vpp = vp; | |
1035 | return (0); | |
1036 | } | |
1037 | return (1); | |
1038 | } | |
1039 | ||
ef62830d KM |
1040 | /* |
1041 | * Calculate the total number of references to a special device. | |
1042 | */ | |
1043 | vcount(vp) | |
1044 | register struct vnode *vp; | |
1045 | { | |
7f7b7d89 | 1046 | register struct vnode *vq; |
ef62830d KM |
1047 | int count; |
1048 | ||
1049 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 1050 | return (vp->v_usecount); |
ef62830d | 1051 | loop: |
7f7b7d89 | 1052 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 1053 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1054 | continue; |
1055 | /* | |
1056 | * Alias, but not in use, so flush it out. | |
1057 | */ | |
7f7b7d89 | 1058 | if (vq->v_usecount == 0) { |
ef62830d KM |
1059 | vgone(vq); |
1060 | goto loop; | |
1061 | } | |
7f7b7d89 | 1062 | count += vq->v_usecount; |
ef62830d KM |
1063 | } |
1064 | return (count); | |
1065 | } | |
0bf84b18 KM |
1066 | |
1067 | /* | |
1068 | * Print out a description of a vnode. | |
1069 | */ | |
1070 | static char *typename[] = | |
61f846a8 | 1071 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1072 | |
1073 | vprint(label, vp) | |
1074 | char *label; | |
1075 | register struct vnode *vp; | |
1076 | { | |
f2f730c6 | 1077 | char buf[64]; |
0bf84b18 KM |
1078 | |
1079 | if (label != NULL) | |
1080 | printf("%s: ", label); | |
65c3b3a8 KM |
1081 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1082 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1083 | vp->v_holdcnt); | |
f2f730c6 KM |
1084 | buf[0] = '\0'; |
1085 | if (vp->v_flag & VROOT) | |
1086 | strcat(buf, "|VROOT"); | |
1087 | if (vp->v_flag & VTEXT) | |
1088 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1089 | if (vp->v_flag & VSYSTEM) |
1090 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1091 | if (vp->v_flag & VXLOCK) |
1092 | strcat(buf, "|VXLOCK"); | |
1093 | if (vp->v_flag & VXWANT) | |
1094 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1095 | if (vp->v_flag & VBWAIT) |
1096 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1097 | if (vp->v_flag & VALIASED) |
1098 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1099 | if (buf[0] != '\0') |
1100 | printf(" flags (%s)", &buf[1]); | |
1101 | printf("\n\t"); | |
0bf84b18 KM |
1102 | VOP_PRINT(vp); |
1103 | } | |
985cbdd5 | 1104 | |
34c62e18 KM |
1105 | #ifdef DEBUG |
1106 | /* | |
1107 | * List all of the locked vnodes in the system. | |
1108 | * Called when debugging the kernel. | |
1109 | */ | |
1110 | printlockedvnodes() | |
1111 | { | |
1112 | register struct mount *mp; | |
1113 | register struct vnode *vp; | |
1114 | ||
1115 | printf("Locked vnodes\n"); | |
1116 | mp = rootfs; | |
1117 | do { | |
1118 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1119 | if (VOP_ISLOCKED(vp)) | |
1120 | vprint((char *)0, vp); | |
1121 | mp = mp->mnt_next; | |
1122 | } while (mp != rootfs); | |
1123 | } | |
1124 | #endif | |
1125 | ||
985cbdd5 MT |
1126 | int kinfo_vdebug = 1; |
1127 | int kinfo_vgetfailed; | |
1128 | #define KINFO_VNODESLOP 10 | |
1129 | /* | |
1130 | * Dump vnode list (via kinfo). | |
1131 | * Copyout address of vnode followed by vnode. | |
1132 | */ | |
aacc1bff | 1133 | /* ARGSUSED */ |
985cbdd5 | 1134 | kinfo_vnode(op, where, acopysize, arg, aneeded) |
aacc1bff | 1135 | int op; |
985cbdd5 | 1136 | char *where; |
aacc1bff | 1137 | int *acopysize, arg, *aneeded; |
985cbdd5 MT |
1138 | { |
1139 | register struct mount *mp = rootfs; | |
36ef03ec | 1140 | struct mount *omp; |
985cbdd5 | 1141 | struct vnode *vp; |
985cbdd5 MT |
1142 | register char *bp = where, *savebp; |
1143 | char *ewhere = where + *acopysize; | |
1144 | int error; | |
1145 | ||
1146 | #define VPTRSZ sizeof (struct vnode *) | |
1147 | #define VNODESZ sizeof (struct vnode) | |
1148 | if (where == NULL) { | |
1149 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
1150 | return (0); | |
1151 | } | |
1152 | ||
985cbdd5 | 1153 | do { |
36ef03ec | 1154 | if (vfs_busy(mp)) { |
54fb9dc2 | 1155 | mp = mp->mnt_next; |
36ef03ec KM |
1156 | continue; |
1157 | } | |
985cbdd5 MT |
1158 | savebp = bp; |
1159 | again: | |
4597dd33 | 1160 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1161 | /* |
1162 | * Check that the vp is still associated with | |
1163 | * this filesystem. RACE: could have been | |
1164 | * recycled onto the same filesystem. | |
1165 | */ | |
4597dd33 KM |
1166 | if (vp->v_mount != mp) { |
1167 | if (kinfo_vdebug) | |
1168 | printf("kinfo: vp changed\n"); | |
1169 | bp = savebp; | |
1170 | goto again; | |
1171 | } | |
985cbdd5 MT |
1172 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
1173 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1174 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 1175 | VNODESZ)))) |
985cbdd5 | 1176 | return (error); |
985cbdd5 | 1177 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1178 | } |
36ef03ec | 1179 | omp = mp; |
54fb9dc2 | 1180 | mp = mp->mnt_next; |
36ef03ec | 1181 | vfs_unbusy(omp); |
985cbdd5 MT |
1182 | } while (mp != rootfs); |
1183 | ||
1184 | *aneeded = bp - where; | |
1185 | if (bp > ewhere) | |
1186 | *acopysize = ewhere - where; | |
1187 | else | |
1188 | *acopysize = bp - where; | |
1189 | return (0); | |
1190 | } |