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 | * | |
2bcd6066 | 17 | * @(#)vfs_subr.c 7.22 (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" | |
c60798ca KM |
28 | #include "namei.h" |
29 | #include "ucred.h" | |
3c4390e8 | 30 | #include "errno.h" |
ef24f6dd | 31 | #include "malloc.h" |
3c4390e8 | 32 | |
3c4390e8 KM |
33 | /* |
34 | * Remove a mount point from the list of mounted filesystems. | |
35 | * Unmount of the root is illegal. | |
36 | */ | |
37 | void | |
38 | vfs_remove(mp) | |
39 | register struct mount *mp; | |
40 | { | |
41 | ||
42 | if (mp == rootfs) | |
43 | panic("vfs_remove: unmounting root"); | |
44 | mp->m_prev->m_next = mp->m_next; | |
45 | mp->m_next->m_prev = mp->m_prev; | |
46 | mp->m_vnodecovered->v_mountedhere = (struct mount *)0; | |
47 | vfs_unlock(mp); | |
48 | } | |
49 | ||
50 | /* | |
51 | * Lock a filesystem. | |
52 | * Used to prevent access to it while mounting and unmounting. | |
53 | */ | |
54 | vfs_lock(mp) | |
55 | register struct mount *mp; | |
56 | { | |
57 | ||
594501df KM |
58 | while(mp->m_flag & M_MLOCK) { |
59 | mp->m_flag |= M_MWAIT; | |
60 | sleep((caddr_t)mp, PVFS); | |
61 | } | |
3c4390e8 KM |
62 | mp->m_flag |= M_MLOCK; |
63 | return (0); | |
64 | } | |
65 | ||
66 | /* | |
67 | * Unlock a locked filesystem. | |
68 | * Panic if filesystem is not locked. | |
69 | */ | |
70 | void | |
71 | vfs_unlock(mp) | |
72 | register struct mount *mp; | |
73 | { | |
74 | ||
75 | if ((mp->m_flag & M_MLOCK) == 0) | |
76 | panic("vfs_unlock: locked fs"); | |
77 | mp->m_flag &= ~M_MLOCK; | |
78 | if (mp->m_flag & M_MWAIT) { | |
79 | mp->m_flag &= ~M_MWAIT; | |
80 | wakeup((caddr_t)mp); | |
81 | } | |
82 | } | |
83 | ||
84 | /* | |
85 | * Lookup a mount point by filesystem identifier. | |
86 | */ | |
87 | struct mount * | |
88 | getvfs(fsid) | |
89 | fsid_t *fsid; | |
90 | { | |
91 | register struct mount *mp; | |
92 | ||
d713f801 KM |
93 | mp = rootfs; |
94 | do { | |
3c4390e8 KM |
95 | if (mp->m_fsid.val[0] == fsid->val[0] && |
96 | mp->m_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 97 | return (mp); |
3c4390e8 | 98 | } |
d713f801 KM |
99 | mp = mp->m_next; |
100 | } while (mp != rootfs); | |
101 | return ((struct mount *)0); | |
3c4390e8 KM |
102 | } |
103 | ||
104 | /* | |
105 | * Set vnode attributes to VNOVAL | |
106 | */ | |
107 | void vattr_null(vap) | |
108 | register struct vattr *vap; | |
109 | { | |
110 | ||
111 | vap->va_type = VNON; | |
112 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = | |
113 | vap->va_fsid = vap->va_fileid = vap->va_size = | |
114 | vap->va_size1 = vap->va_blocksize = vap->va_rdev = | |
115 | vap->va_bytes = vap->va_bytes1 = | |
116 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = | |
117 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
118 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
119 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 120 | } |
c60798ca KM |
121 | |
122 | /* | |
123 | * Initialize a nameidata structure | |
124 | */ | |
125 | ndinit(ndp) | |
126 | register struct nameidata *ndp; | |
127 | { | |
128 | ||
129 | bzero((caddr_t)ndp, sizeof(struct nameidata)); | |
130 | ndp->ni_iov = &ndp->ni_nd.nd_iovec; | |
131 | ndp->ni_iovcnt = 1; | |
132 | ndp->ni_base = (caddr_t)&ndp->ni_dent; | |
133 | ndp->ni_rw = UIO_WRITE; | |
4dbe3531 | 134 | ndp->ni_uioseg = UIO_SYSSPACE; |
c60798ca KM |
135 | } |
136 | ||
137 | /* | |
138 | * Duplicate a nameidata structure | |
139 | */ | |
140 | nddup(ndp, newndp) | |
141 | register struct nameidata *ndp, *newndp; | |
142 | { | |
143 | ||
144 | ndinit(newndp); | |
145 | newndp->ni_cdir = ndp->ni_cdir; | |
8fe1c702 | 146 | VREF(newndp->ni_cdir); |
c60798ca KM |
147 | newndp->ni_rdir = ndp->ni_rdir; |
148 | if (newndp->ni_rdir) | |
8fe1c702 | 149 | VREF(newndp->ni_rdir); |
c60798ca KM |
150 | newndp->ni_cred = ndp->ni_cred; |
151 | crhold(newndp->ni_cred); | |
152 | } | |
153 | ||
154 | /* | |
155 | * Release a nameidata structure | |
156 | */ | |
157 | ndrele(ndp) | |
158 | register struct nameidata *ndp; | |
159 | { | |
160 | ||
161 | vrele(ndp->ni_cdir); | |
162 | if (ndp->ni_rdir) | |
163 | vrele(ndp->ni_rdir); | |
164 | crfree(ndp->ni_cred); | |
165 | } | |
36d09cb1 KM |
166 | |
167 | /* | |
168 | * Routines having to do with the management of the vnode table. | |
169 | */ | |
170 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 171 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 172 | extern void vclean(); |
c0de8792 KM |
173 | |
174 | #define SPECHSZ 64 | |
175 | #if ((SPECHSZ&(SPECHSZ-1)) == 0) | |
176 | #define SPECHASH(rdev) (((rdev>>5)+(rdev))&(SPECHSZ-1)) | |
177 | #else | |
178 | #define SPECHASH(rdev) (((unsigned)((rdev>>5)+(rdev)))%SPECHSZ) | |
179 | #endif | |
180 | struct vnode *speclisth[SPECHSZ]; | |
36d09cb1 KM |
181 | |
182 | /* | |
ef24f6dd | 183 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 184 | */ |
ef24f6dd | 185 | vfsinit() |
36d09cb1 KM |
186 | { |
187 | register struct vnode *vp = vnode; | |
ef24f6dd | 188 | struct vfsops **vfsp; |
36d09cb1 | 189 | |
ef24f6dd KM |
190 | /* |
191 | * Build vnode free list. | |
192 | */ | |
36d09cb1 KM |
193 | vfreeh = vp; |
194 | vfreet = &vp->v_freef; | |
195 | vp->v_freeb = &vfreeh; | |
196 | vp->v_op = &dead_vnodeops; | |
197 | for (vp++; vp < vnodeNVNODE; vp++) { | |
198 | *vfreet = vp; | |
199 | vp->v_freeb = vfreet; | |
200 | vfreet = &vp->v_freef; | |
201 | vp->v_op = &dead_vnodeops; | |
202 | } | |
203 | vp--; | |
204 | vp->v_freef = NULL; | |
ef24f6dd KM |
205 | /* |
206 | * Initialize the vnode name cache | |
207 | */ | |
208 | nchinit(); | |
209 | /* | |
210 | * Initialize each file system type. | |
211 | */ | |
212 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { | |
213 | if (*vfsp == NULL) | |
214 | continue; | |
215 | (*(*vfsp)->vfs_init)(); | |
216 | } | |
36d09cb1 KM |
217 | } |
218 | ||
219 | /* | |
220 | * Return the next vnode from the free list. | |
221 | */ | |
222 | getnewvnode(tag, mp, vops, vpp) | |
223 | enum vtagtype tag; | |
224 | struct mount *mp; | |
225 | struct vnodeops *vops; | |
226 | struct vnode **vpp; | |
227 | { | |
228 | register struct vnode *vp, *vq; | |
229 | ||
230 | if ((vp = vfreeh) == NULL) { | |
231 | tablefull("vnode"); | |
232 | *vpp = 0; | |
233 | return (ENFILE); | |
234 | } | |
7f7b7d89 | 235 | if (vp->v_usecount) |
36d09cb1 KM |
236 | panic("free vnode isn't"); |
237 | if (vq = vp->v_freef) | |
238 | vq->v_freeb = &vfreeh; | |
239 | vfreeh = vq; | |
240 | vp->v_freef = NULL; | |
241 | vp->v_freeb = NULL; | |
b027498b | 242 | if (vp->v_type != VNON && vp->v_type != VBAD) |
ef24f6dd | 243 | vgone(vp); |
b027498b | 244 | vp->v_type = VNON; |
36d09cb1 KM |
245 | vp->v_flag = 0; |
246 | vp->v_shlockc = 0; | |
247 | vp->v_exlockc = 0; | |
7f7b7d89 | 248 | vp->v_lastr = 0; |
36d09cb1 | 249 | vp->v_socket = 0; |
36d09cb1 KM |
250 | cache_purge(vp); |
251 | vp->v_tag = tag; | |
ef24f6dd | 252 | vp->v_op = vops; |
36d09cb1 KM |
253 | insmntque(vp, mp); |
254 | VREF(vp); | |
255 | *vpp = vp; | |
256 | return (0); | |
257 | } | |
258 | ||
259 | /* | |
260 | * Move a vnode from one mount queue to another. | |
261 | */ | |
262 | insmntque(vp, mp) | |
263 | register struct vnode *vp; | |
264 | register struct mount *mp; | |
265 | { | |
266 | struct vnode *vq; | |
267 | ||
268 | /* | |
269 | * Delete from old mount point vnode list, if on one. | |
270 | */ | |
271 | if (vp->v_mountb) { | |
272 | if (vq = vp->v_mountf) | |
273 | vq->v_mountb = vp->v_mountb; | |
274 | *vp->v_mountb = vq; | |
275 | } | |
276 | /* | |
277 | * Insert into list of vnodes for the new mount point, if available. | |
278 | */ | |
a45ff315 | 279 | vp->v_mount = mp; |
36d09cb1 KM |
280 | if (mp == NULL) { |
281 | vp->v_mountf = NULL; | |
282 | vp->v_mountb = NULL; | |
283 | return; | |
284 | } | |
285 | if (mp->m_mounth) { | |
286 | vp->v_mountf = mp->m_mounth; | |
287 | vp->v_mountb = &mp->m_mounth; | |
288 | mp->m_mounth->v_mountb = &vp->v_mountf; | |
289 | mp->m_mounth = vp; | |
290 | } else { | |
291 | mp->m_mounth = vp; | |
292 | vp->v_mountb = &mp->m_mounth; | |
293 | vp->v_mountf = NULL; | |
294 | } | |
295 | } | |
296 | ||
297 | /* | |
ef24f6dd KM |
298 | * Create a vnode for a block device. |
299 | * Used for root filesystem, argdev, and swap areas. | |
300 | * Also used for memory file system special devices. | |
301 | */ | |
302 | bdevvp(dev, vpp) | |
303 | dev_t dev; | |
304 | struct vnode **vpp; | |
305 | { | |
ef24f6dd KM |
306 | register struct vnode *vp; |
307 | struct vnode *nvp; | |
308 | int error; | |
309 | ||
4ef5d036 | 310 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
311 | if (error) { |
312 | *vpp = 0; | |
313 | return (error); | |
314 | } | |
315 | vp = nvp; | |
316 | vp->v_type = VBLK; | |
c0de8792 | 317 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
318 | vput(vp); |
319 | vp = nvp; | |
320 | } | |
321 | *vpp = vp; | |
322 | return (0); | |
323 | } | |
324 | ||
325 | /* | |
326 | * Check to see if the new vnode represents a special device | |
327 | * for which we already have a vnode (either because of | |
328 | * bdevvp() or because of a different vnode representing | |
329 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 330 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
331 | * caller is responsible for filling it with its new contents. |
332 | */ | |
333 | struct vnode * | |
c0de8792 | 334 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 335 | register struct vnode *nvp; |
c0de8792 | 336 | dev_t nvp_rdev; |
ef24f6dd KM |
337 | struct mount *mp; |
338 | { | |
339 | register struct vnode *vp; | |
c0de8792 | 340 | struct vnode **vpp; |
ef24f6dd KM |
341 | |
342 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
343 | return ((struct vnode *)0); | |
c0de8792 KM |
344 | |
345 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 346 | loop: |
c0de8792 KM |
347 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
348 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 349 | continue; |
c0de8792 KM |
350 | /* |
351 | * Alias, but not in use, so flush it out. | |
352 | */ | |
7f7b7d89 | 353 | if (vp->v_usecount == 0) { |
c0de8792 KM |
354 | vgone(vp); |
355 | goto loop; | |
356 | } | |
ef62830d KM |
357 | if (vget(vp)) |
358 | goto loop; | |
ef24f6dd KM |
359 | break; |
360 | } | |
c0de8792 KM |
361 | if (vp == NULL || vp->v_tag != VT_NON) { |
362 | if (vp != NULL) { | |
c0de8792 | 363 | nvp->v_flag |= VALIASED; |
a45ff315 KM |
364 | vp->v_flag |= VALIASED; |
365 | vput(vp); | |
c0de8792 KM |
366 | } |
367 | MALLOC(nvp->v_specinfo, struct specinfo *, | |
368 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
369 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 370 | nvp->v_hashchain = vpp; |
c0de8792 KM |
371 | nvp->v_specnext = *vpp; |
372 | *vpp = nvp; | |
ef24f6dd KM |
373 | return ((struct vnode *)0); |
374 | } | |
2bae1875 KM |
375 | VOP_UNLOCK(vp); |
376 | vclean(vp, 0); | |
ef24f6dd KM |
377 | vp->v_op = nvp->v_op; |
378 | vp->v_tag = nvp->v_tag; | |
379 | nvp->v_type = VNON; | |
380 | insmntque(vp, mp); | |
381 | return (vp); | |
382 | } | |
383 | ||
384 | /* | |
385 | * Grab a particular vnode from the free list, increment its | |
386 | * reference count and lock it. The vnode lock bit is set the | |
387 | * vnode is being eliminated in vgone. The process is awakened | |
388 | * when the transition is completed, and an error returned to | |
389 | * indicate that the vnode is no longer usable (possibly having | |
390 | * been changed to a new file system type). | |
36d09cb1 KM |
391 | */ |
392 | vget(vp) | |
393 | register struct vnode *vp; | |
394 | { | |
395 | register struct vnode *vq; | |
396 | ||
ef24f6dd KM |
397 | if (vp->v_flag & VXLOCK) { |
398 | vp->v_flag |= VXWANT; | |
399 | sleep((caddr_t)vp, PINOD); | |
400 | return (1); | |
401 | } | |
7f7b7d89 | 402 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
403 | if (vq = vp->v_freef) |
404 | vq->v_freeb = vp->v_freeb; | |
405 | else | |
406 | vfreet = vp->v_freeb; | |
407 | *vp->v_freeb = vq; | |
408 | vp->v_freef = NULL; | |
409 | vp->v_freeb = NULL; | |
410 | } | |
36d09cb1 | 411 | VREF(vp); |
ef24f6dd KM |
412 | VOP_LOCK(vp); |
413 | return (0); | |
36d09cb1 KM |
414 | } |
415 | ||
416 | /* | |
417 | * Vnode reference, just increment the count | |
418 | */ | |
419 | void vref(vp) | |
420 | struct vnode *vp; | |
421 | { | |
422 | ||
7f7b7d89 | 423 | vp->v_usecount++; |
36d09cb1 KM |
424 | } |
425 | ||
426 | /* | |
427 | * vput(), just unlock and vrele() | |
428 | */ | |
429 | void vput(vp) | |
430 | register struct vnode *vp; | |
431 | { | |
432 | VOP_UNLOCK(vp); | |
433 | vrele(vp); | |
434 | } | |
435 | ||
436 | /* | |
437 | * Vnode release. | |
438 | * If count drops to zero, call inactive routine and return to freelist. | |
439 | */ | |
440 | void vrele(vp) | |
441 | register struct vnode *vp; | |
442 | { | |
443 | ||
444 | if (vp == NULL) | |
ef24f6dd | 445 | panic("vrele: null vp"); |
7f7b7d89 KM |
446 | vp->v_usecount--; |
447 | if (vp->v_usecount < 0) | |
0bf84b18 | 448 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 449 | if (vp->v_usecount > 0) |
36d09cb1 | 450 | return; |
36d09cb1 KM |
451 | if (vfreeh == (struct vnode *)0) { |
452 | /* | |
453 | * insert into empty list | |
454 | */ | |
455 | vfreeh = vp; | |
456 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
457 | } else { |
458 | /* | |
459 | * insert at tail of list | |
460 | */ | |
461 | *vfreet = vp; | |
462 | vp->v_freeb = vfreet; | |
36d09cb1 | 463 | } |
ef24f6dd KM |
464 | vp->v_freef = NULL; |
465 | vfreet = &vp->v_freef; | |
466 | VOP_INACTIVE(vp); | |
467 | } | |
468 | ||
7f7b7d89 KM |
469 | /* |
470 | * Page or buffer structure gets a reference. | |
471 | */ | |
472 | vhold(vp) | |
473 | register struct vnode *vp; | |
474 | { | |
475 | ||
476 | vp->v_holdcnt++; | |
477 | } | |
478 | ||
479 | /* | |
480 | * Page or buffer structure frees a reference. | |
481 | */ | |
482 | holdrele(vp) | |
483 | register struct vnode *vp; | |
484 | { | |
485 | ||
486 | if (vp->v_holdcnt <= 0) | |
487 | panic("holdrele: holdcnt"); | |
488 | vp->v_holdcnt--; | |
489 | } | |
490 | ||
f0556f86 KM |
491 | /* |
492 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
493 | * | |
494 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
495 | * return error if any are found (nb: this is a user error, not a | |
496 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
497 | * that are found. | |
498 | */ | |
499 | int busyprt = 0; /* patch to print out busy vnodes */ | |
500 | ||
501 | vflush(mp, skipvp, flags) | |
502 | struct mount *mp; | |
503 | struct vnode *skipvp; | |
504 | int flags; | |
505 | { | |
506 | register struct vnode *vp, *nvp; | |
507 | int busy = 0; | |
508 | ||
509 | for (vp = mp->m_mounth; vp; vp = nvp) { | |
510 | nvp = vp->v_mountf; | |
511 | /* | |
512 | * Skip over a selected vnode. | |
513 | * Used by ufs to skip over the quota structure inode. | |
514 | */ | |
515 | if (vp == skipvp) | |
516 | continue; | |
517 | /* | |
7f7b7d89 | 518 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
519 | * out the vnode data structures and we are done. |
520 | */ | |
7f7b7d89 | 521 | if (vp->v_usecount == 0) { |
f0556f86 KM |
522 | vgone(vp); |
523 | continue; | |
524 | } | |
525 | /* | |
526 | * For block or character devices, revert to an | |
527 | * anonymous device. For all other files, just kill them. | |
528 | */ | |
529 | if (flags & MNT_FORCE) { | |
530 | if (vp->v_type != VBLK && vp->v_type != VCHR) { | |
531 | vgone(vp); | |
532 | } else { | |
533 | vclean(vp, 0); | |
534 | vp->v_op = &spec_vnodeops; | |
535 | insmntque(vp, (struct mount *)0); | |
536 | } | |
537 | continue; | |
538 | } | |
539 | if (busyprt) | |
0bf84b18 | 540 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
541 | busy++; |
542 | } | |
543 | if (busy) | |
544 | return (EBUSY); | |
545 | return (0); | |
546 | } | |
547 | ||
ef24f6dd KM |
548 | /* |
549 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 550 | */ |
2bae1875 | 551 | void vclean(vp, doclose) |
ef24f6dd | 552 | register struct vnode *vp; |
2bae1875 | 553 | long doclose; |
ef24f6dd KM |
554 | { |
555 | struct vnodeops *origops; | |
2bae1875 | 556 | int active; |
ef24f6dd | 557 | |
2bae1875 KM |
558 | /* |
559 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
560 | * If so we have to reference it before we clean it out |
561 | * so that its count cannot fall to zero and generate a | |
562 | * race against ourselves to recycle it. | |
2bae1875 | 563 | */ |
7f7b7d89 | 564 | if (active = vp->v_usecount) |
2bae1875 | 565 | VREF(vp); |
2bae1875 KM |
566 | /* |
567 | * Prevent the vnode from being recycled or | |
568 | * brought into use while we clean it out. | |
569 | */ | |
0bf84b18 KM |
570 | if (vp->v_flag & VXLOCK) |
571 | panic("vclean: deadlock"); | |
ef24f6dd | 572 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
573 | /* |
574 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
575 | * have the object locked while it cleans it out. The VOP_LOCK | |
576 | * ensures that the VOP_INACTIVE routine is done with its work. | |
577 | * For active vnodes, it ensures that no other activity can | |
578 | * occur while the buffer list is being cleaned out. | |
579 | */ | |
580 | VOP_LOCK(vp); | |
581 | if (doclose) | |
582 | vinvalbuf(vp, 1); | |
ef24f6dd KM |
583 | /* |
584 | * Prevent any further operations on the vnode from | |
585 | * being passed through to the old file system. | |
586 | */ | |
587 | origops = vp->v_op; | |
588 | vp->v_op = &dead_vnodeops; | |
589 | vp->v_tag = VT_NON; | |
590 | /* | |
2bae1875 KM |
591 | * If purging an active vnode, it must be unlocked, closed, |
592 | * and deactivated before being reclaimed. | |
ef24f6dd | 593 | */ |
0bf84b18 | 594 | (*(origops->vn_unlock))(vp); |
2bae1875 | 595 | if (active) { |
2bae1875 KM |
596 | if (doclose) |
597 | (*(origops->vn_close))(vp, 0, NOCRED); | |
ef24f6dd KM |
598 | (*(origops->vn_inactive))(vp); |
599 | } | |
600 | /* | |
601 | * Reclaim the vnode. | |
602 | */ | |
603 | if ((*(origops->vn_reclaim))(vp)) | |
604 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
605 | if (active) |
606 | vrele(vp); | |
ef24f6dd KM |
607 | /* |
608 | * Done with purge, notify sleepers in vget of the grim news. | |
609 | */ | |
610 | vp->v_flag &= ~VXLOCK; | |
611 | if (vp->v_flag & VXWANT) { | |
612 | vp->v_flag &= ~VXWANT; | |
613 | wakeup((caddr_t)vp); | |
614 | } | |
615 | } | |
616 | ||
ef62830d KM |
617 | /* |
618 | * Eliminate all activity associated with the requested vnode | |
619 | * and with all vnodes aliased to the requested vnode. | |
620 | */ | |
621 | void vgoneall(vp) | |
622 | register struct vnode *vp; | |
623 | { | |
7f7b7d89 | 624 | register struct vnode *vq; |
ef62830d | 625 | |
7f7b7d89 KM |
626 | while (vp->v_flag & VALIASED) { |
627 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
ef62830d KM |
628 | if (vq->v_rdev != vp->v_rdev || vp == vq) |
629 | continue; | |
630 | vgone(vq); | |
7f7b7d89 | 631 | break; |
ef62830d KM |
632 | } |
633 | } | |
634 | vgone(vp); | |
635 | } | |
636 | ||
ef24f6dd KM |
637 | /* |
638 | * Eliminate all activity associated with a vnode | |
639 | * in preparation for reuse. | |
640 | */ | |
641 | void vgone(vp) | |
642 | register struct vnode *vp; | |
643 | { | |
7f7b7d89 | 644 | register struct vnode *vq; |
c0de8792 KM |
645 | struct vnode *vx; |
646 | long count; | |
ef24f6dd | 647 | |
ef24f6dd KM |
648 | /* |
649 | * Clean out the filesystem specific data. | |
650 | */ | |
2bae1875 | 651 | vclean(vp, 1); |
ef24f6dd KM |
652 | /* |
653 | * Delete from old mount point vnode list, if on one. | |
654 | */ | |
655 | if (vp->v_mountb) { | |
656 | if (vq = vp->v_mountf) | |
657 | vq->v_mountb = vp->v_mountb; | |
658 | *vp->v_mountb = vq; | |
659 | vp->v_mountf = NULL; | |
660 | vp->v_mountb = NULL; | |
661 | } | |
662 | /* | |
663 | * If special device, remove it from special device alias list. | |
664 | */ | |
665 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
666 | if (*vp->v_hashchain == vp) { |
667 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 668 | } else { |
7f7b7d89 | 669 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 670 | if (vq->v_specnext != vp) |
ef24f6dd | 671 | continue; |
c0de8792 | 672 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
673 | break; |
674 | } | |
c0de8792 | 675 | if (vq == NULL) |
ef24f6dd KM |
676 | panic("missing bdev"); |
677 | } | |
c0de8792 | 678 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
679 | count = 0; |
680 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
c0de8792 KM |
681 | if (vq->v_rdev != vp->v_rdev) |
682 | continue; | |
683 | count++; | |
684 | vx = vq; | |
685 | } | |
686 | if (count == 0) | |
687 | panic("missing alias"); | |
688 | if (count == 1) | |
689 | vx->v_flag &= ~VALIASED; | |
690 | vp->v_flag &= ~VALIASED; | |
691 | } | |
692 | FREE(vp->v_specinfo, M_VNODE); | |
693 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
694 | } |
695 | /* | |
696 | * If it is on the freelist, move it to the head of the list. | |
697 | */ | |
698 | if (vp->v_freeb) { | |
699 | if (vq = vp->v_freef) | |
700 | vq->v_freeb = vp->v_freeb; | |
701 | else | |
702 | vfreet = vp->v_freeb; | |
703 | *vp->v_freeb = vq; | |
704 | vp->v_freef = vfreeh; | |
705 | vp->v_freeb = &vfreeh; | |
706 | vfreeh->v_freeb = &vp->v_freef; | |
707 | vfreeh = vp; | |
708 | } | |
2bae1875 | 709 | vp->v_type = VBAD; |
36d09cb1 | 710 | } |
ef62830d | 711 | |
2bcd6066 KM |
712 | /* |
713 | * Lookup a vnode by device number. | |
714 | */ | |
715 | vfinddev(dev, type, vpp) | |
716 | dev_t dev; | |
717 | enum vtype type; | |
718 | struct vnode **vpp; | |
719 | { | |
720 | register struct vnode *vp; | |
721 | ||
722 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
723 | if (dev != vp->v_rdev || type != vp->v_type) | |
724 | continue; | |
725 | *vpp = vp; | |
726 | return (0); | |
727 | } | |
728 | return (1); | |
729 | } | |
730 | ||
ef62830d KM |
731 | /* |
732 | * Calculate the total number of references to a special device. | |
733 | */ | |
734 | vcount(vp) | |
735 | register struct vnode *vp; | |
736 | { | |
7f7b7d89 | 737 | register struct vnode *vq; |
ef62830d KM |
738 | int count; |
739 | ||
740 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 741 | return (vp->v_usecount); |
ef62830d | 742 | loop: |
7f7b7d89 | 743 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
ef62830d KM |
744 | if (vq->v_rdev != vp->v_rdev) |
745 | continue; | |
746 | /* | |
747 | * Alias, but not in use, so flush it out. | |
748 | */ | |
7f7b7d89 | 749 | if (vq->v_usecount == 0) { |
ef62830d KM |
750 | vgone(vq); |
751 | goto loop; | |
752 | } | |
7f7b7d89 | 753 | count += vq->v_usecount; |
ef62830d KM |
754 | } |
755 | return (count); | |
756 | } | |
0bf84b18 KM |
757 | |
758 | /* | |
759 | * Print out a description of a vnode. | |
760 | */ | |
761 | static char *typename[] = | |
762 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VBAD" }; | |
763 | ||
764 | vprint(label, vp) | |
765 | char *label; | |
766 | register struct vnode *vp; | |
767 | { | |
768 | ||
769 | if (label != NULL) | |
770 | printf("%s: ", label); | |
7f7b7d89 KM |
771 | printf("type %s, usecount %d, refcount %d,\n\t", typename[vp->v_type], |
772 | vp->v_usecount, vp->v_holdcnt); | |
0bf84b18 KM |
773 | VOP_PRINT(vp); |
774 | } |