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 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
6 | * provided that the above copyright notice and this paragraph are | |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
16 | * | |
7be98467 | 17 | * @(#)vfs_subr.c 7.37 (Berkeley) %G% |
3c4390e8 KM |
18 | */ |
19 | ||
20 | /* | |
21 | * External virtual filesystem routines | |
22 | */ | |
23 | ||
24 | #include "param.h" | |
25 | #include "mount.h" | |
26 | #include "time.h" | |
27 | #include "vnode.h" | |
0f93ba7b | 28 | #include "specdev.h" |
c60798ca KM |
29 | #include "namei.h" |
30 | #include "ucred.h" | |
3c4390e8 | 31 | #include "errno.h" |
ef24f6dd | 32 | #include "malloc.h" |
3c4390e8 | 33 | |
3c4390e8 KM |
34 | /* |
35 | * Remove a mount point from the list of mounted filesystems. | |
36 | * Unmount of the root is illegal. | |
37 | */ | |
38 | void | |
39 | vfs_remove(mp) | |
40 | register struct mount *mp; | |
41 | { | |
42 | ||
43 | if (mp == rootfs) | |
44 | panic("vfs_remove: unmounting root"); | |
45 | mp->m_prev->m_next = mp->m_next; | |
46 | mp->m_next->m_prev = mp->m_prev; | |
47 | mp->m_vnodecovered->v_mountedhere = (struct mount *)0; | |
48 | vfs_unlock(mp); | |
49 | } | |
50 | ||
51 | /* | |
52 | * Lock a filesystem. | |
53 | * Used to prevent access to it while mounting and unmounting. | |
54 | */ | |
55 | vfs_lock(mp) | |
56 | register struct mount *mp; | |
57 | { | |
58 | ||
594501df KM |
59 | while(mp->m_flag & M_MLOCK) { |
60 | mp->m_flag |= M_MWAIT; | |
61 | sleep((caddr_t)mp, PVFS); | |
62 | } | |
3c4390e8 KM |
63 | mp->m_flag |= M_MLOCK; |
64 | return (0); | |
65 | } | |
66 | ||
67 | /* | |
68 | * Unlock a locked filesystem. | |
69 | * Panic if filesystem is not locked. | |
70 | */ | |
71 | void | |
72 | vfs_unlock(mp) | |
73 | register struct mount *mp; | |
74 | { | |
75 | ||
76 | if ((mp->m_flag & M_MLOCK) == 0) | |
77 | panic("vfs_unlock: locked fs"); | |
78 | mp->m_flag &= ~M_MLOCK; | |
79 | if (mp->m_flag & M_MWAIT) { | |
80 | mp->m_flag &= ~M_MWAIT; | |
81 | wakeup((caddr_t)mp); | |
82 | } | |
83 | } | |
84 | ||
85 | /* | |
86 | * Lookup a mount point by filesystem identifier. | |
87 | */ | |
88 | struct mount * | |
89 | getvfs(fsid) | |
90 | fsid_t *fsid; | |
91 | { | |
92 | register struct mount *mp; | |
93 | ||
d713f801 KM |
94 | mp = rootfs; |
95 | do { | |
8393745b KM |
96 | if (mp->m_stat.f_fsid.val[0] == fsid->val[0] && |
97 | mp->m_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 98 | return (mp); |
3c4390e8 | 99 | } |
d713f801 KM |
100 | mp = mp->m_next; |
101 | } while (mp != rootfs); | |
102 | return ((struct mount *)0); | |
3c4390e8 KM |
103 | } |
104 | ||
105 | /* | |
106 | * Set vnode attributes to VNOVAL | |
107 | */ | |
108 | void vattr_null(vap) | |
109 | register struct vattr *vap; | |
110 | { | |
111 | ||
112 | vap->va_type = VNON; | |
113 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = | |
114 | vap->va_fsid = vap->va_fileid = vap->va_size = | |
8fae943a KM |
115 | vap->va_size_rsv = vap->va_blocksize = vap->va_rdev = |
116 | vap->va_bytes = vap->va_bytes_rsv = | |
3c4390e8 KM |
117 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
118 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
119 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
120 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 121 | } |
c60798ca KM |
122 | |
123 | /* | |
124 | * Initialize a nameidata structure | |
125 | */ | |
126 | ndinit(ndp) | |
127 | register struct nameidata *ndp; | |
128 | { | |
129 | ||
130 | bzero((caddr_t)ndp, sizeof(struct nameidata)); | |
131 | ndp->ni_iov = &ndp->ni_nd.nd_iovec; | |
132 | ndp->ni_iovcnt = 1; | |
133 | ndp->ni_base = (caddr_t)&ndp->ni_dent; | |
134 | ndp->ni_rw = UIO_WRITE; | |
4dbe3531 | 135 | ndp->ni_uioseg = UIO_SYSSPACE; |
c60798ca KM |
136 | } |
137 | ||
138 | /* | |
139 | * Duplicate a nameidata structure | |
140 | */ | |
141 | nddup(ndp, newndp) | |
142 | register struct nameidata *ndp, *newndp; | |
143 | { | |
144 | ||
145 | ndinit(newndp); | |
146 | newndp->ni_cdir = ndp->ni_cdir; | |
8fe1c702 | 147 | VREF(newndp->ni_cdir); |
c60798ca KM |
148 | newndp->ni_rdir = ndp->ni_rdir; |
149 | if (newndp->ni_rdir) | |
8fe1c702 | 150 | VREF(newndp->ni_rdir); |
c60798ca KM |
151 | newndp->ni_cred = ndp->ni_cred; |
152 | crhold(newndp->ni_cred); | |
153 | } | |
154 | ||
155 | /* | |
156 | * Release a nameidata structure | |
157 | */ | |
158 | ndrele(ndp) | |
159 | register struct nameidata *ndp; | |
160 | { | |
161 | ||
162 | vrele(ndp->ni_cdir); | |
163 | if (ndp->ni_rdir) | |
164 | vrele(ndp->ni_rdir); | |
165 | crfree(ndp->ni_cred); | |
166 | } | |
36d09cb1 KM |
167 | |
168 | /* | |
169 | * Routines having to do with the management of the vnode table. | |
170 | */ | |
171 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 172 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 173 | extern void vclean(); |
c0de8792 | 174 | |
36d09cb1 | 175 | /* |
ef24f6dd | 176 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 177 | */ |
ef24f6dd | 178 | vfsinit() |
36d09cb1 KM |
179 | { |
180 | register struct vnode *vp = vnode; | |
ef24f6dd | 181 | struct vfsops **vfsp; |
36d09cb1 | 182 | |
ef24f6dd KM |
183 | /* |
184 | * Build vnode free list. | |
185 | */ | |
36d09cb1 KM |
186 | vfreeh = vp; |
187 | vfreet = &vp->v_freef; | |
188 | vp->v_freeb = &vfreeh; | |
189 | vp->v_op = &dead_vnodeops; | |
69384bf7 | 190 | vp->v_type = VBAD; |
36d09cb1 KM |
191 | for (vp++; vp < vnodeNVNODE; vp++) { |
192 | *vfreet = vp; | |
193 | vp->v_freeb = vfreet; | |
194 | vfreet = &vp->v_freef; | |
195 | vp->v_op = &dead_vnodeops; | |
69384bf7 | 196 | vp->v_type = VBAD; |
36d09cb1 KM |
197 | } |
198 | vp--; | |
199 | vp->v_freef = NULL; | |
ef24f6dd KM |
200 | /* |
201 | * Initialize the vnode name cache | |
202 | */ | |
203 | nchinit(); | |
204 | /* | |
205 | * Initialize each file system type. | |
206 | */ | |
207 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { | |
208 | if (*vfsp == NULL) | |
209 | continue; | |
210 | (*(*vfsp)->vfs_init)(); | |
211 | } | |
36d09cb1 KM |
212 | } |
213 | ||
214 | /* | |
215 | * Return the next vnode from the free list. | |
216 | */ | |
217 | getnewvnode(tag, mp, vops, vpp) | |
218 | enum vtagtype tag; | |
219 | struct mount *mp; | |
220 | struct vnodeops *vops; | |
221 | struct vnode **vpp; | |
222 | { | |
223 | register struct vnode *vp, *vq; | |
224 | ||
225 | if ((vp = vfreeh) == NULL) { | |
226 | tablefull("vnode"); | |
227 | *vpp = 0; | |
228 | return (ENFILE); | |
229 | } | |
7f7b7d89 | 230 | if (vp->v_usecount) |
36d09cb1 KM |
231 | panic("free vnode isn't"); |
232 | if (vq = vp->v_freef) | |
233 | vq->v_freeb = &vfreeh; | |
7be98467 KM |
234 | else |
235 | vfreet = &vfreeh; | |
36d09cb1 KM |
236 | vfreeh = vq; |
237 | vp->v_freef = NULL; | |
238 | vp->v_freeb = NULL; | |
ccc07962 | 239 | if (vp->v_type != VBAD) |
ef24f6dd | 240 | vgone(vp); |
b027498b | 241 | vp->v_type = VNON; |
36d09cb1 KM |
242 | vp->v_flag = 0; |
243 | vp->v_shlockc = 0; | |
244 | vp->v_exlockc = 0; | |
7f7b7d89 | 245 | vp->v_lastr = 0; |
36d09cb1 | 246 | vp->v_socket = 0; |
36d09cb1 KM |
247 | cache_purge(vp); |
248 | vp->v_tag = tag; | |
ef24f6dd | 249 | vp->v_op = vops; |
36d09cb1 KM |
250 | insmntque(vp, mp); |
251 | VREF(vp); | |
252 | *vpp = vp; | |
253 | return (0); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Move a vnode from one mount queue to another. | |
258 | */ | |
259 | insmntque(vp, mp) | |
260 | register struct vnode *vp; | |
261 | register struct mount *mp; | |
262 | { | |
263 | struct vnode *vq; | |
264 | ||
265 | /* | |
266 | * Delete from old mount point vnode list, if on one. | |
267 | */ | |
268 | if (vp->v_mountb) { | |
269 | if (vq = vp->v_mountf) | |
270 | vq->v_mountb = vp->v_mountb; | |
271 | *vp->v_mountb = vq; | |
272 | } | |
273 | /* | |
274 | * Insert into list of vnodes for the new mount point, if available. | |
275 | */ | |
a45ff315 | 276 | vp->v_mount = mp; |
36d09cb1 KM |
277 | if (mp == NULL) { |
278 | vp->v_mountf = NULL; | |
279 | vp->v_mountb = NULL; | |
280 | return; | |
281 | } | |
282 | if (mp->m_mounth) { | |
283 | vp->v_mountf = mp->m_mounth; | |
284 | vp->v_mountb = &mp->m_mounth; | |
285 | mp->m_mounth->v_mountb = &vp->v_mountf; | |
286 | mp->m_mounth = vp; | |
287 | } else { | |
288 | mp->m_mounth = vp; | |
289 | vp->v_mountb = &mp->m_mounth; | |
290 | vp->v_mountf = NULL; | |
291 | } | |
292 | } | |
293 | ||
294 | /* | |
ef24f6dd KM |
295 | * Create a vnode for a block device. |
296 | * Used for root filesystem, argdev, and swap areas. | |
297 | * Also used for memory file system special devices. | |
298 | */ | |
299 | bdevvp(dev, vpp) | |
300 | dev_t dev; | |
301 | struct vnode **vpp; | |
302 | { | |
ef24f6dd KM |
303 | register struct vnode *vp; |
304 | struct vnode *nvp; | |
305 | int error; | |
306 | ||
4ef5d036 | 307 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
308 | if (error) { |
309 | *vpp = 0; | |
310 | return (error); | |
311 | } | |
312 | vp = nvp; | |
313 | vp->v_type = VBLK; | |
c0de8792 | 314 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
315 | vput(vp); |
316 | vp = nvp; | |
317 | } | |
318 | *vpp = vp; | |
319 | return (0); | |
320 | } | |
321 | ||
322 | /* | |
323 | * Check to see if the new vnode represents a special device | |
324 | * for which we already have a vnode (either because of | |
325 | * bdevvp() or because of a different vnode representing | |
326 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 327 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
328 | * caller is responsible for filling it with its new contents. |
329 | */ | |
330 | struct vnode * | |
c0de8792 | 331 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 332 | register struct vnode *nvp; |
c0de8792 | 333 | dev_t nvp_rdev; |
ef24f6dd KM |
334 | struct mount *mp; |
335 | { | |
336 | register struct vnode *vp; | |
c0de8792 | 337 | struct vnode **vpp; |
ef24f6dd KM |
338 | |
339 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
340 | return ((struct vnode *)0); | |
c0de8792 KM |
341 | |
342 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 343 | loop: |
c0de8792 KM |
344 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
345 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 346 | continue; |
c0de8792 KM |
347 | /* |
348 | * Alias, but not in use, so flush it out. | |
349 | */ | |
7f7b7d89 | 350 | if (vp->v_usecount == 0) { |
c0de8792 KM |
351 | vgone(vp); |
352 | goto loop; | |
353 | } | |
ef62830d KM |
354 | if (vget(vp)) |
355 | goto loop; | |
ef24f6dd KM |
356 | break; |
357 | } | |
c0de8792 | 358 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
359 | MALLOC(nvp->v_specinfo, struct specinfo *, |
360 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
361 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 362 | nvp->v_hashchain = vpp; |
c0de8792 KM |
363 | nvp->v_specnext = *vpp; |
364 | *vpp = nvp; | |
40452d5e KM |
365 | if (vp != NULL) { |
366 | nvp->v_flag |= VALIASED; | |
367 | vp->v_flag |= VALIASED; | |
368 | vput(vp); | |
369 | } | |
ef24f6dd KM |
370 | return ((struct vnode *)0); |
371 | } | |
2bae1875 KM |
372 | VOP_UNLOCK(vp); |
373 | vclean(vp, 0); | |
ef24f6dd KM |
374 | vp->v_op = nvp->v_op; |
375 | vp->v_tag = nvp->v_tag; | |
376 | nvp->v_type = VNON; | |
377 | insmntque(vp, mp); | |
378 | return (vp); | |
379 | } | |
380 | ||
381 | /* | |
382 | * Grab a particular vnode from the free list, increment its | |
383 | * reference count and lock it. The vnode lock bit is set the | |
384 | * vnode is being eliminated in vgone. The process is awakened | |
385 | * when the transition is completed, and an error returned to | |
386 | * indicate that the vnode is no longer usable (possibly having | |
387 | * been changed to a new file system type). | |
36d09cb1 KM |
388 | */ |
389 | vget(vp) | |
390 | register struct vnode *vp; | |
391 | { | |
392 | register struct vnode *vq; | |
393 | ||
ef24f6dd KM |
394 | if (vp->v_flag & VXLOCK) { |
395 | vp->v_flag |= VXWANT; | |
396 | sleep((caddr_t)vp, PINOD); | |
397 | return (1); | |
398 | } | |
7f7b7d89 | 399 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
400 | if (vq = vp->v_freef) |
401 | vq->v_freeb = vp->v_freeb; | |
402 | else | |
403 | vfreet = vp->v_freeb; | |
404 | *vp->v_freeb = vq; | |
405 | vp->v_freef = NULL; | |
406 | vp->v_freeb = NULL; | |
407 | } | |
36d09cb1 | 408 | VREF(vp); |
ef24f6dd KM |
409 | VOP_LOCK(vp); |
410 | return (0); | |
36d09cb1 KM |
411 | } |
412 | ||
413 | /* | |
414 | * Vnode reference, just increment the count | |
415 | */ | |
416 | void vref(vp) | |
417 | struct vnode *vp; | |
418 | { | |
419 | ||
7f7b7d89 | 420 | vp->v_usecount++; |
36d09cb1 KM |
421 | } |
422 | ||
423 | /* | |
424 | * vput(), just unlock and vrele() | |
425 | */ | |
426 | void vput(vp) | |
427 | register struct vnode *vp; | |
428 | { | |
429 | VOP_UNLOCK(vp); | |
430 | vrele(vp); | |
431 | } | |
432 | ||
433 | /* | |
434 | * Vnode release. | |
435 | * If count drops to zero, call inactive routine and return to freelist. | |
436 | */ | |
437 | void vrele(vp) | |
438 | register struct vnode *vp; | |
439 | { | |
440 | ||
441 | if (vp == NULL) | |
ef24f6dd | 442 | panic("vrele: null vp"); |
7f7b7d89 KM |
443 | vp->v_usecount--; |
444 | if (vp->v_usecount < 0) | |
0bf84b18 | 445 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 446 | if (vp->v_usecount > 0) |
36d09cb1 | 447 | return; |
36d09cb1 KM |
448 | if (vfreeh == (struct vnode *)0) { |
449 | /* | |
450 | * insert into empty list | |
451 | */ | |
452 | vfreeh = vp; | |
453 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
454 | } else { |
455 | /* | |
456 | * insert at tail of list | |
457 | */ | |
458 | *vfreet = vp; | |
459 | vp->v_freeb = vfreet; | |
36d09cb1 | 460 | } |
ef24f6dd KM |
461 | vp->v_freef = NULL; |
462 | vfreet = &vp->v_freef; | |
463 | VOP_INACTIVE(vp); | |
464 | } | |
465 | ||
7f7b7d89 KM |
466 | /* |
467 | * Page or buffer structure gets a reference. | |
468 | */ | |
469 | vhold(vp) | |
470 | register struct vnode *vp; | |
471 | { | |
472 | ||
473 | vp->v_holdcnt++; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Page or buffer structure frees a reference. | |
478 | */ | |
479 | holdrele(vp) | |
480 | register struct vnode *vp; | |
481 | { | |
482 | ||
483 | if (vp->v_holdcnt <= 0) | |
484 | panic("holdrele: holdcnt"); | |
485 | vp->v_holdcnt--; | |
486 | } | |
487 | ||
f0556f86 KM |
488 | /* |
489 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
490 | * | |
491 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
492 | * return error if any are found (nb: this is a user error, not a | |
493 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
494 | * that are found. | |
495 | */ | |
496 | int busyprt = 0; /* patch to print out busy vnodes */ | |
497 | ||
498 | vflush(mp, skipvp, flags) | |
499 | struct mount *mp; | |
500 | struct vnode *skipvp; | |
501 | int flags; | |
502 | { | |
503 | register struct vnode *vp, *nvp; | |
504 | int busy = 0; | |
505 | ||
506 | for (vp = mp->m_mounth; vp; vp = nvp) { | |
507 | nvp = vp->v_mountf; | |
508 | /* | |
509 | * Skip over a selected vnode. | |
510 | * Used by ufs to skip over the quota structure inode. | |
511 | */ | |
512 | if (vp == skipvp) | |
513 | continue; | |
514 | /* | |
7f7b7d89 | 515 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
516 | * out the vnode data structures and we are done. |
517 | */ | |
7f7b7d89 | 518 | if (vp->v_usecount == 0) { |
f0556f86 KM |
519 | vgone(vp); |
520 | continue; | |
521 | } | |
522 | /* | |
523 | * For block or character devices, revert to an | |
524 | * anonymous device. For all other files, just kill them. | |
525 | */ | |
526 | if (flags & MNT_FORCE) { | |
527 | if (vp->v_type != VBLK && vp->v_type != VCHR) { | |
528 | vgone(vp); | |
529 | } else { | |
530 | vclean(vp, 0); | |
531 | vp->v_op = &spec_vnodeops; | |
532 | insmntque(vp, (struct mount *)0); | |
533 | } | |
534 | continue; | |
535 | } | |
536 | if (busyprt) | |
0bf84b18 | 537 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
538 | busy++; |
539 | } | |
540 | if (busy) | |
541 | return (EBUSY); | |
542 | return (0); | |
543 | } | |
544 | ||
ef24f6dd KM |
545 | /* |
546 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 547 | */ |
2bae1875 | 548 | void vclean(vp, doclose) |
ef24f6dd | 549 | register struct vnode *vp; |
2bae1875 | 550 | long doclose; |
ef24f6dd KM |
551 | { |
552 | struct vnodeops *origops; | |
2bae1875 | 553 | int active; |
ef24f6dd | 554 | |
2bae1875 KM |
555 | /* |
556 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
557 | * If so we have to reference it before we clean it out |
558 | * so that its count cannot fall to zero and generate a | |
559 | * race against ourselves to recycle it. | |
2bae1875 | 560 | */ |
7f7b7d89 | 561 | if (active = vp->v_usecount) |
2bae1875 | 562 | VREF(vp); |
2bae1875 KM |
563 | /* |
564 | * Prevent the vnode from being recycled or | |
565 | * brought into use while we clean it out. | |
566 | */ | |
0bf84b18 KM |
567 | if (vp->v_flag & VXLOCK) |
568 | panic("vclean: deadlock"); | |
ef24f6dd | 569 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
570 | /* |
571 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
572 | * have the object locked while it cleans it out. The VOP_LOCK | |
573 | * ensures that the VOP_INACTIVE routine is done with its work. | |
574 | * For active vnodes, it ensures that no other activity can | |
575 | * occur while the buffer list is being cleaned out. | |
576 | */ | |
577 | VOP_LOCK(vp); | |
578 | if (doclose) | |
579 | vinvalbuf(vp, 1); | |
ef24f6dd KM |
580 | /* |
581 | * Prevent any further operations on the vnode from | |
582 | * being passed through to the old file system. | |
583 | */ | |
584 | origops = vp->v_op; | |
585 | vp->v_op = &dead_vnodeops; | |
586 | vp->v_tag = VT_NON; | |
587 | /* | |
2bae1875 KM |
588 | * If purging an active vnode, it must be unlocked, closed, |
589 | * and deactivated before being reclaimed. | |
ef24f6dd | 590 | */ |
0bf84b18 | 591 | (*(origops->vn_unlock))(vp); |
2bae1875 | 592 | if (active) { |
2bae1875 KM |
593 | if (doclose) |
594 | (*(origops->vn_close))(vp, 0, NOCRED); | |
ef24f6dd KM |
595 | (*(origops->vn_inactive))(vp); |
596 | } | |
597 | /* | |
598 | * Reclaim the vnode. | |
599 | */ | |
600 | if ((*(origops->vn_reclaim))(vp)) | |
601 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
602 | if (active) |
603 | vrele(vp); | |
ef24f6dd KM |
604 | /* |
605 | * Done with purge, notify sleepers in vget of the grim news. | |
606 | */ | |
607 | vp->v_flag &= ~VXLOCK; | |
608 | if (vp->v_flag & VXWANT) { | |
609 | vp->v_flag &= ~VXWANT; | |
610 | wakeup((caddr_t)vp); | |
611 | } | |
612 | } | |
613 | ||
ef62830d KM |
614 | /* |
615 | * Eliminate all activity associated with the requested vnode | |
616 | * and with all vnodes aliased to the requested vnode. | |
617 | */ | |
618 | void vgoneall(vp) | |
619 | register struct vnode *vp; | |
620 | { | |
7f7b7d89 | 621 | register struct vnode *vq; |
ef62830d | 622 | |
7a7b3a95 KM |
623 | if (vp->v_flag & VALIASED) { |
624 | /* | |
625 | * If a vgone (or vclean) is already in progress, | |
626 | * wait until it is done and return. | |
627 | */ | |
628 | if (vp->v_flag & VXLOCK) { | |
629 | vp->v_flag |= VXWANT; | |
630 | sleep((caddr_t)vp, PINOD); | |
631 | return; | |
632 | } | |
633 | /* | |
634 | * Ensure that vp will not be vgone'd while we | |
635 | * are eliminating its aliases. | |
636 | */ | |
637 | vp->v_flag |= VXLOCK; | |
638 | while (vp->v_flag & VALIASED) { | |
639 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
640 | if (vq->v_rdev != vp->v_rdev || | |
641 | vq->v_type != vp->v_type || vp == vq) | |
642 | continue; | |
643 | vgone(vq); | |
644 | break; | |
645 | } | |
ef62830d | 646 | } |
7a7b3a95 KM |
647 | /* |
648 | * Remove the lock so that vgone below will | |
649 | * really eliminate the vnode after which time | |
650 | * vgone will awaken any sleepers. | |
651 | */ | |
652 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
653 | } |
654 | vgone(vp); | |
655 | } | |
656 | ||
ef24f6dd KM |
657 | /* |
658 | * Eliminate all activity associated with a vnode | |
659 | * in preparation for reuse. | |
660 | */ | |
661 | void vgone(vp) | |
662 | register struct vnode *vp; | |
663 | { | |
7f7b7d89 | 664 | register struct vnode *vq; |
c0de8792 KM |
665 | struct vnode *vx; |
666 | long count; | |
ef24f6dd | 667 | |
4f55e3ec KM |
668 | /* |
669 | * If a vgone (or vclean) is already in progress, | |
670 | * wait until it is done and return. | |
671 | */ | |
672 | if (vp->v_flag & VXLOCK) { | |
673 | vp->v_flag |= VXWANT; | |
674 | sleep((caddr_t)vp, PINOD); | |
675 | return; | |
676 | } | |
ef24f6dd KM |
677 | /* |
678 | * Clean out the filesystem specific data. | |
679 | */ | |
2bae1875 | 680 | vclean(vp, 1); |
ef24f6dd KM |
681 | /* |
682 | * Delete from old mount point vnode list, if on one. | |
683 | */ | |
684 | if (vp->v_mountb) { | |
685 | if (vq = vp->v_mountf) | |
686 | vq->v_mountb = vp->v_mountb; | |
687 | *vp->v_mountb = vq; | |
688 | vp->v_mountf = NULL; | |
689 | vp->v_mountb = NULL; | |
690 | } | |
691 | /* | |
692 | * If special device, remove it from special device alias list. | |
693 | */ | |
694 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
695 | if (*vp->v_hashchain == vp) { |
696 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 697 | } else { |
7f7b7d89 | 698 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 699 | if (vq->v_specnext != vp) |
ef24f6dd | 700 | continue; |
c0de8792 | 701 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
702 | break; |
703 | } | |
c0de8792 | 704 | if (vq == NULL) |
ef24f6dd KM |
705 | panic("missing bdev"); |
706 | } | |
c0de8792 | 707 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
708 | count = 0; |
709 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
710 | if (vq->v_rdev != vp->v_rdev || |
711 | vq->v_type != vp->v_type) | |
c0de8792 KM |
712 | continue; |
713 | count++; | |
714 | vx = vq; | |
715 | } | |
716 | if (count == 0) | |
717 | panic("missing alias"); | |
718 | if (count == 1) | |
719 | vx->v_flag &= ~VALIASED; | |
720 | vp->v_flag &= ~VALIASED; | |
721 | } | |
722 | FREE(vp->v_specinfo, M_VNODE); | |
723 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
724 | } |
725 | /* | |
726 | * If it is on the freelist, move it to the head of the list. | |
727 | */ | |
728 | if (vp->v_freeb) { | |
729 | if (vq = vp->v_freef) | |
730 | vq->v_freeb = vp->v_freeb; | |
731 | else | |
732 | vfreet = vp->v_freeb; | |
733 | *vp->v_freeb = vq; | |
734 | vp->v_freef = vfreeh; | |
735 | vp->v_freeb = &vfreeh; | |
736 | vfreeh->v_freeb = &vp->v_freef; | |
737 | vfreeh = vp; | |
738 | } | |
2bae1875 | 739 | vp->v_type = VBAD; |
36d09cb1 | 740 | } |
ef62830d | 741 | |
2bcd6066 KM |
742 | /* |
743 | * Lookup a vnode by device number. | |
744 | */ | |
745 | vfinddev(dev, type, vpp) | |
746 | dev_t dev; | |
747 | enum vtype type; | |
748 | struct vnode **vpp; | |
749 | { | |
750 | register struct vnode *vp; | |
751 | ||
752 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
753 | if (dev != vp->v_rdev || type != vp->v_type) | |
754 | continue; | |
755 | *vpp = vp; | |
756 | return (0); | |
757 | } | |
758 | return (1); | |
759 | } | |
760 | ||
ef62830d KM |
761 | /* |
762 | * Calculate the total number of references to a special device. | |
763 | */ | |
764 | vcount(vp) | |
765 | register struct vnode *vp; | |
766 | { | |
7f7b7d89 | 767 | register struct vnode *vq; |
ef62830d KM |
768 | int count; |
769 | ||
770 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 771 | return (vp->v_usecount); |
ef62830d | 772 | loop: |
7f7b7d89 | 773 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 774 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
775 | continue; |
776 | /* | |
777 | * Alias, but not in use, so flush it out. | |
778 | */ | |
7f7b7d89 | 779 | if (vq->v_usecount == 0) { |
ef62830d KM |
780 | vgone(vq); |
781 | goto loop; | |
782 | } | |
7f7b7d89 | 783 | count += vq->v_usecount; |
ef62830d KM |
784 | } |
785 | return (count); | |
786 | } | |
0bf84b18 KM |
787 | |
788 | /* | |
789 | * Print out a description of a vnode. | |
790 | */ | |
791 | static char *typename[] = | |
61f846a8 | 792 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
793 | |
794 | vprint(label, vp) | |
795 | char *label; | |
796 | register struct vnode *vp; | |
797 | { | |
f2f730c6 | 798 | char buf[64]; |
0bf84b18 KM |
799 | |
800 | if (label != NULL) | |
801 | printf("%s: ", label); | |
f2f730c6 | 802 | printf("type %s, usecount %d, refcount %d,", typename[vp->v_type], |
7f7b7d89 | 803 | vp->v_usecount, vp->v_holdcnt); |
f2f730c6 KM |
804 | buf[0] = '\0'; |
805 | if (vp->v_flag & VROOT) | |
806 | strcat(buf, "|VROOT"); | |
807 | if (vp->v_flag & VTEXT) | |
808 | strcat(buf, "|VTEXT"); | |
809 | if (vp->v_flag & VXLOCK) | |
810 | strcat(buf, "|VXLOCK"); | |
811 | if (vp->v_flag & VXWANT) | |
812 | strcat(buf, "|VXWANT"); | |
813 | if (vp->v_flag & VEXLOCK) | |
814 | strcat(buf, "|VEXLOCK"); | |
815 | if (vp->v_flag & VSHLOCK) | |
816 | strcat(buf, "|VSHLOCK"); | |
817 | if (vp->v_flag & VLWAIT) | |
818 | strcat(buf, "|VLWAIT"); | |
819 | if (vp->v_flag & VALIASED) | |
820 | strcat(buf, "|VALIASED"); | |
821 | if (vp->v_flag & VBWAIT) | |
822 | strcat(buf, "|VBWAIT"); | |
823 | if (buf[0] != '\0') | |
824 | printf(" flags (%s)", &buf[1]); | |
825 | printf("\n\t"); | |
0bf84b18 KM |
826 | VOP_PRINT(vp); |
827 | } |