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 | * | |
32339c94 | 17 | * @(#)vfs_subr.c 7.18 (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; | |
134 | ndp->ni_segflg = UIO_SYSSPACE; | |
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 | } | |
ef24f6dd | 235 | if (vp->v_count) |
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; | |
248 | vp->v_socket = 0; | |
36d09cb1 KM |
249 | cache_purge(vp); |
250 | vp->v_tag = tag; | |
ef24f6dd | 251 | vp->v_op = vops; |
36d09cb1 KM |
252 | insmntque(vp, mp); |
253 | VREF(vp); | |
254 | *vpp = vp; | |
255 | return (0); | |
256 | } | |
257 | ||
258 | /* | |
259 | * Move a vnode from one mount queue to another. | |
260 | */ | |
261 | insmntque(vp, mp) | |
262 | register struct vnode *vp; | |
263 | register struct mount *mp; | |
264 | { | |
265 | struct vnode *vq; | |
266 | ||
267 | /* | |
268 | * Delete from old mount point vnode list, if on one. | |
269 | */ | |
270 | if (vp->v_mountb) { | |
271 | if (vq = vp->v_mountf) | |
272 | vq->v_mountb = vp->v_mountb; | |
273 | *vp->v_mountb = vq; | |
274 | } | |
275 | /* | |
276 | * Insert into list of vnodes for the new mount point, if available. | |
277 | */ | |
a45ff315 | 278 | vp->v_mount = mp; |
36d09cb1 KM |
279 | if (mp == NULL) { |
280 | vp->v_mountf = NULL; | |
281 | vp->v_mountb = NULL; | |
282 | return; | |
283 | } | |
284 | if (mp->m_mounth) { | |
285 | vp->v_mountf = mp->m_mounth; | |
286 | vp->v_mountb = &mp->m_mounth; | |
287 | mp->m_mounth->v_mountb = &vp->v_mountf; | |
288 | mp->m_mounth = vp; | |
289 | } else { | |
290 | mp->m_mounth = vp; | |
291 | vp->v_mountb = &mp->m_mounth; | |
292 | vp->v_mountf = NULL; | |
293 | } | |
294 | } | |
295 | ||
296 | /* | |
ef24f6dd KM |
297 | * Create a vnode for a block device. |
298 | * Used for root filesystem, argdev, and swap areas. | |
299 | * Also used for memory file system special devices. | |
300 | */ | |
301 | bdevvp(dev, vpp) | |
302 | dev_t dev; | |
303 | struct vnode **vpp; | |
304 | { | |
ef24f6dd KM |
305 | register struct vnode *vp; |
306 | struct vnode *nvp; | |
307 | int error; | |
308 | ||
4ef5d036 | 309 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
310 | if (error) { |
311 | *vpp = 0; | |
312 | return (error); | |
313 | } | |
314 | vp = nvp; | |
315 | vp->v_type = VBLK; | |
c0de8792 | 316 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
317 | vput(vp); |
318 | vp = nvp; | |
319 | } | |
320 | *vpp = vp; | |
321 | return (0); | |
322 | } | |
323 | ||
324 | /* | |
325 | * Check to see if the new vnode represents a special device | |
326 | * for which we already have a vnode (either because of | |
327 | * bdevvp() or because of a different vnode representing | |
328 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 329 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
330 | * caller is responsible for filling it with its new contents. |
331 | */ | |
332 | struct vnode * | |
c0de8792 | 333 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 334 | register struct vnode *nvp; |
c0de8792 | 335 | dev_t nvp_rdev; |
ef24f6dd KM |
336 | struct mount *mp; |
337 | { | |
338 | register struct vnode *vp; | |
c0de8792 | 339 | struct vnode **vpp; |
ef24f6dd KM |
340 | |
341 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
342 | return ((struct vnode *)0); | |
c0de8792 KM |
343 | |
344 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 345 | loop: |
c0de8792 KM |
346 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
347 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 348 | continue; |
c0de8792 KM |
349 | /* |
350 | * Alias, but not in use, so flush it out. | |
351 | */ | |
ef62830d | 352 | if (vp->v_count == 0) { |
c0de8792 KM |
353 | vgone(vp); |
354 | goto loop; | |
355 | } | |
ef62830d KM |
356 | if (vget(vp)) |
357 | goto loop; | |
ef24f6dd KM |
358 | break; |
359 | } | |
c0de8792 KM |
360 | if (vp == NULL || vp->v_tag != VT_NON) { |
361 | if (vp != NULL) { | |
c0de8792 | 362 | nvp->v_flag |= VALIASED; |
a45ff315 KM |
363 | vp->v_flag |= VALIASED; |
364 | vput(vp); | |
c0de8792 KM |
365 | } |
366 | MALLOC(nvp->v_specinfo, struct specinfo *, | |
367 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
368 | nvp->v_rdev = nvp_rdev; | |
369 | nvp->v_mounton = NULL; | |
370 | nvp->v_lastr = 0; | |
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 | } | |
402 | if (vp->v_count == 0) { | |
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 | ||
423 | vp->v_count++; | |
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"); |
36d09cb1 KM |
446 | vp->v_count--; |
447 | if (vp->v_count < 0) | |
448 | printf("vnode bad ref count %d, type %d, tag %d\n", | |
449 | vp->v_count, vp->v_type, vp->v_tag); | |
450 | if (vp->v_count > 0) | |
451 | return; | |
36d09cb1 KM |
452 | if (vfreeh == (struct vnode *)0) { |
453 | /* | |
454 | * insert into empty list | |
455 | */ | |
456 | vfreeh = vp; | |
457 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
458 | } else { |
459 | /* | |
460 | * insert at tail of list | |
461 | */ | |
462 | *vfreet = vp; | |
463 | vp->v_freeb = vfreet; | |
36d09cb1 | 464 | } |
ef24f6dd KM |
465 | vp->v_freef = NULL; |
466 | vfreet = &vp->v_freef; | |
467 | VOP_INACTIVE(vp); | |
468 | } | |
469 | ||
f0556f86 KM |
470 | /* |
471 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
472 | * | |
473 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
474 | * return error if any are found (nb: this is a user error, not a | |
475 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
476 | * that are found. | |
477 | */ | |
478 | int busyprt = 0; /* patch to print out busy vnodes */ | |
479 | ||
480 | vflush(mp, skipvp, flags) | |
481 | struct mount *mp; | |
482 | struct vnode *skipvp; | |
483 | int flags; | |
484 | { | |
485 | register struct vnode *vp, *nvp; | |
486 | int busy = 0; | |
487 | ||
488 | for (vp = mp->m_mounth; vp; vp = nvp) { | |
489 | nvp = vp->v_mountf; | |
490 | /* | |
491 | * Skip over a selected vnode. | |
492 | * Used by ufs to skip over the quota structure inode. | |
493 | */ | |
494 | if (vp == skipvp) | |
495 | continue; | |
496 | /* | |
497 | * With v_count == 0, all we need to do is clear | |
498 | * out the vnode data structures and we are done. | |
499 | */ | |
500 | if (vp->v_count == 0) { | |
501 | vgone(vp); | |
502 | continue; | |
503 | } | |
504 | /* | |
505 | * For block or character devices, revert to an | |
506 | * anonymous device. For all other files, just kill them. | |
507 | */ | |
508 | if (flags & MNT_FORCE) { | |
509 | if (vp->v_type != VBLK && vp->v_type != VCHR) { | |
510 | vgone(vp); | |
511 | } else { | |
512 | vclean(vp, 0); | |
513 | vp->v_op = &spec_vnodeops; | |
514 | insmntque(vp, (struct mount *)0); | |
515 | } | |
516 | continue; | |
517 | } | |
518 | if (busyprt) | |
519 | printf("vflush: busy vnode count %d type %d tag %d\n", | |
520 | vp->v_count, vp->v_type, vp->v_tag); | |
521 | busy++; | |
522 | } | |
523 | if (busy) | |
524 | return (EBUSY); | |
525 | return (0); | |
526 | } | |
527 | ||
ef24f6dd KM |
528 | /* |
529 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 530 | */ |
2bae1875 | 531 | void vclean(vp, doclose) |
ef24f6dd | 532 | register struct vnode *vp; |
2bae1875 | 533 | long doclose; |
ef24f6dd KM |
534 | { |
535 | struct vnodeops *origops; | |
2bae1875 | 536 | int active; |
ef24f6dd | 537 | |
2bae1875 KM |
538 | /* |
539 | * Check to see if the vnode is in use. | |
540 | * If so we have to lock it before we clean it out. | |
541 | */ | |
542 | if (active = vp->v_count) { | |
543 | VREF(vp); | |
544 | VOP_LOCK(vp); | |
545 | } | |
546 | /* | |
547 | * Prevent the vnode from being recycled or | |
548 | * brought into use while we clean it out. | |
549 | */ | |
ef24f6dd KM |
550 | while (vp->v_flag & VXLOCK) { |
551 | vp->v_flag |= VXWANT; | |
552 | sleep((caddr_t)vp, PINOD); | |
553 | } | |
554 | vp->v_flag |= VXLOCK; | |
555 | /* | |
556 | * Prevent any further operations on the vnode from | |
557 | * being passed through to the old file system. | |
558 | */ | |
559 | origops = vp->v_op; | |
560 | vp->v_op = &dead_vnodeops; | |
561 | vp->v_tag = VT_NON; | |
562 | /* | |
2bae1875 KM |
563 | * If purging an active vnode, it must be unlocked, closed, |
564 | * and deactivated before being reclaimed. | |
ef24f6dd | 565 | */ |
2bae1875 | 566 | if (active) { |
ef24f6dd | 567 | (*(origops->vn_unlock))(vp); |
2bae1875 KM |
568 | if (doclose) |
569 | (*(origops->vn_close))(vp, 0, NOCRED); | |
ef24f6dd KM |
570 | (*(origops->vn_inactive))(vp); |
571 | } | |
572 | /* | |
573 | * Reclaim the vnode. | |
574 | */ | |
575 | if ((*(origops->vn_reclaim))(vp)) | |
576 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
577 | if (active) |
578 | vrele(vp); | |
ef24f6dd KM |
579 | /* |
580 | * Done with purge, notify sleepers in vget of the grim news. | |
581 | */ | |
582 | vp->v_flag &= ~VXLOCK; | |
583 | if (vp->v_flag & VXWANT) { | |
584 | vp->v_flag &= ~VXWANT; | |
585 | wakeup((caddr_t)vp); | |
586 | } | |
587 | } | |
588 | ||
ef62830d KM |
589 | /* |
590 | * Eliminate all activity associated with the requested vnode | |
591 | * and with all vnodes aliased to the requested vnode. | |
592 | */ | |
593 | void vgoneall(vp) | |
594 | register struct vnode *vp; | |
595 | { | |
596 | register struct vnode *vq, **vpp; | |
597 | ||
598 | if (vp->v_flag & VALIASED) { | |
599 | vpp = &speclisth[SPECHASH(vp->v_rdev)]; | |
600 | loop: | |
601 | for (vq = *vpp; vq; vq = vq->v_specnext) { | |
602 | if (vq->v_rdev != vp->v_rdev || vp == vq) | |
603 | continue; | |
604 | vgone(vq); | |
605 | goto loop; | |
606 | } | |
607 | } | |
608 | vgone(vp); | |
609 | } | |
610 | ||
ef24f6dd KM |
611 | /* |
612 | * Eliminate all activity associated with a vnode | |
613 | * in preparation for reuse. | |
614 | */ | |
615 | void vgone(vp) | |
616 | register struct vnode *vp; | |
617 | { | |
c0de8792 KM |
618 | register struct vnode *vq, **vpp; |
619 | struct vnode *vx; | |
620 | long count; | |
ef24f6dd | 621 | |
ef24f6dd KM |
622 | /* |
623 | * Clean out the filesystem specific data. | |
624 | */ | |
2bae1875 | 625 | vclean(vp, 1); |
ef24f6dd KM |
626 | /* |
627 | * Delete from old mount point vnode list, if on one. | |
628 | */ | |
629 | if (vp->v_mountb) { | |
630 | if (vq = vp->v_mountf) | |
631 | vq->v_mountb = vp->v_mountb; | |
632 | *vp->v_mountb = vq; | |
633 | vp->v_mountf = NULL; | |
634 | vp->v_mountb = NULL; | |
635 | } | |
636 | /* | |
637 | * If special device, remove it from special device alias list. | |
638 | */ | |
639 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
c0de8792 KM |
640 | vpp = &speclisth[SPECHASH(vp->v_rdev)]; |
641 | if (*vpp == vp) { | |
642 | *vpp = vp->v_specnext; | |
ef24f6dd | 643 | } else { |
c0de8792 KM |
644 | for (vq = *vpp; vq; vq = vq->v_specnext) { |
645 | if (vq->v_specnext != vp) | |
ef24f6dd | 646 | continue; |
c0de8792 | 647 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
648 | break; |
649 | } | |
c0de8792 | 650 | if (vq == NULL) |
ef24f6dd KM |
651 | panic("missing bdev"); |
652 | } | |
c0de8792 KM |
653 | if (vp->v_flag & VALIASED) { |
654 | for (count = 0, vq = *vpp; vq; vq = vq->v_specnext) { | |
655 | if (vq->v_rdev != vp->v_rdev) | |
656 | continue; | |
657 | count++; | |
658 | vx = vq; | |
659 | } | |
660 | if (count == 0) | |
661 | panic("missing alias"); | |
662 | if (count == 1) | |
663 | vx->v_flag &= ~VALIASED; | |
664 | vp->v_flag &= ~VALIASED; | |
665 | } | |
666 | FREE(vp->v_specinfo, M_VNODE); | |
667 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
668 | } |
669 | /* | |
670 | * If it is on the freelist, move it to the head of the list. | |
671 | */ | |
672 | if (vp->v_freeb) { | |
673 | if (vq = vp->v_freef) | |
674 | vq->v_freeb = vp->v_freeb; | |
675 | else | |
676 | vfreet = vp->v_freeb; | |
677 | *vp->v_freeb = vq; | |
678 | vp->v_freef = vfreeh; | |
679 | vp->v_freeb = &vfreeh; | |
680 | vfreeh->v_freeb = &vp->v_freef; | |
681 | vfreeh = vp; | |
682 | } | |
2bae1875 | 683 | vp->v_type = VBAD; |
36d09cb1 | 684 | } |
ef62830d KM |
685 | |
686 | /* | |
687 | * Calculate the total number of references to a special device. | |
688 | */ | |
689 | vcount(vp) | |
690 | register struct vnode *vp; | |
691 | { | |
692 | register struct vnode *vq, **vpp; | |
693 | int count; | |
694 | ||
695 | if ((vp->v_flag & VALIASED) == 0) | |
696 | return (vp->v_count); | |
697 | vpp = &speclisth[SPECHASH(vp->v_rdev)]; | |
698 | loop: | |
699 | for (count = 0, vq = *vpp; vq; vq = vq->v_specnext) { | |
700 | if (vq->v_rdev != vp->v_rdev) | |
701 | continue; | |
702 | /* | |
703 | * Alias, but not in use, so flush it out. | |
704 | */ | |
705 | if (vq->v_count == 0) { | |
706 | vgone(vq); | |
707 | goto loop; | |
708 | } | |
709 | count += vq->v_count; | |
710 | } | |
711 | return (count); | |
712 | } |