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 | * | |
de81e10c | 17 | * @(#)vfs_subr.c 7.27 (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; | |
69384bf7 | 197 | vp->v_type = VBAD; |
36d09cb1 KM |
198 | for (vp++; vp < vnodeNVNODE; vp++) { |
199 | *vfreet = vp; | |
200 | vp->v_freeb = vfreet; | |
201 | vfreet = &vp->v_freef; | |
202 | vp->v_op = &dead_vnodeops; | |
69384bf7 | 203 | vp->v_type = VBAD; |
36d09cb1 KM |
204 | } |
205 | vp--; | |
206 | vp->v_freef = NULL; | |
ef24f6dd KM |
207 | /* |
208 | * Initialize the vnode name cache | |
209 | */ | |
210 | nchinit(); | |
211 | /* | |
212 | * Initialize each file system type. | |
213 | */ | |
214 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { | |
215 | if (*vfsp == NULL) | |
216 | continue; | |
217 | (*(*vfsp)->vfs_init)(); | |
218 | } | |
36d09cb1 KM |
219 | } |
220 | ||
221 | /* | |
222 | * Return the next vnode from the free list. | |
223 | */ | |
224 | getnewvnode(tag, mp, vops, vpp) | |
225 | enum vtagtype tag; | |
226 | struct mount *mp; | |
227 | struct vnodeops *vops; | |
228 | struct vnode **vpp; | |
229 | { | |
230 | register struct vnode *vp, *vq; | |
231 | ||
232 | if ((vp = vfreeh) == NULL) { | |
233 | tablefull("vnode"); | |
234 | *vpp = 0; | |
235 | return (ENFILE); | |
236 | } | |
7f7b7d89 | 237 | if (vp->v_usecount) |
36d09cb1 KM |
238 | panic("free vnode isn't"); |
239 | if (vq = vp->v_freef) | |
240 | vq->v_freeb = &vfreeh; | |
241 | vfreeh = vq; | |
242 | vp->v_freef = NULL; | |
243 | vp->v_freeb = NULL; | |
ccc07962 | 244 | if (vp->v_type != VBAD) |
ef24f6dd | 245 | vgone(vp); |
b027498b | 246 | vp->v_type = VNON; |
36d09cb1 KM |
247 | vp->v_flag = 0; |
248 | vp->v_shlockc = 0; | |
249 | vp->v_exlockc = 0; | |
7f7b7d89 | 250 | vp->v_lastr = 0; |
36d09cb1 | 251 | vp->v_socket = 0; |
36d09cb1 KM |
252 | cache_purge(vp); |
253 | vp->v_tag = tag; | |
ef24f6dd | 254 | vp->v_op = vops; |
36d09cb1 KM |
255 | insmntque(vp, mp); |
256 | VREF(vp); | |
257 | *vpp = vp; | |
258 | return (0); | |
259 | } | |
260 | ||
261 | /* | |
262 | * Move a vnode from one mount queue to another. | |
263 | */ | |
264 | insmntque(vp, mp) | |
265 | register struct vnode *vp; | |
266 | register struct mount *mp; | |
267 | { | |
268 | struct vnode *vq; | |
269 | ||
270 | /* | |
271 | * Delete from old mount point vnode list, if on one. | |
272 | */ | |
273 | if (vp->v_mountb) { | |
274 | if (vq = vp->v_mountf) | |
275 | vq->v_mountb = vp->v_mountb; | |
276 | *vp->v_mountb = vq; | |
277 | } | |
278 | /* | |
279 | * Insert into list of vnodes for the new mount point, if available. | |
280 | */ | |
a45ff315 | 281 | vp->v_mount = mp; |
36d09cb1 KM |
282 | if (mp == NULL) { |
283 | vp->v_mountf = NULL; | |
284 | vp->v_mountb = NULL; | |
285 | return; | |
286 | } | |
287 | if (mp->m_mounth) { | |
288 | vp->v_mountf = mp->m_mounth; | |
289 | vp->v_mountb = &mp->m_mounth; | |
290 | mp->m_mounth->v_mountb = &vp->v_mountf; | |
291 | mp->m_mounth = vp; | |
292 | } else { | |
293 | mp->m_mounth = vp; | |
294 | vp->v_mountb = &mp->m_mounth; | |
295 | vp->v_mountf = NULL; | |
296 | } | |
297 | } | |
298 | ||
299 | /* | |
ef24f6dd KM |
300 | * Create a vnode for a block device. |
301 | * Used for root filesystem, argdev, and swap areas. | |
302 | * Also used for memory file system special devices. | |
303 | */ | |
304 | bdevvp(dev, vpp) | |
305 | dev_t dev; | |
306 | struct vnode **vpp; | |
307 | { | |
ef24f6dd KM |
308 | register struct vnode *vp; |
309 | struct vnode *nvp; | |
310 | int error; | |
311 | ||
4ef5d036 | 312 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
313 | if (error) { |
314 | *vpp = 0; | |
315 | return (error); | |
316 | } | |
317 | vp = nvp; | |
318 | vp->v_type = VBLK; | |
c0de8792 | 319 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
320 | vput(vp); |
321 | vp = nvp; | |
322 | } | |
323 | *vpp = vp; | |
324 | return (0); | |
325 | } | |
326 | ||
327 | /* | |
328 | * Check to see if the new vnode represents a special device | |
329 | * for which we already have a vnode (either because of | |
330 | * bdevvp() or because of a different vnode representing | |
331 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 332 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
333 | * caller is responsible for filling it with its new contents. |
334 | */ | |
335 | struct vnode * | |
c0de8792 | 336 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 337 | register struct vnode *nvp; |
c0de8792 | 338 | dev_t nvp_rdev; |
ef24f6dd KM |
339 | struct mount *mp; |
340 | { | |
341 | register struct vnode *vp; | |
c0de8792 | 342 | struct vnode **vpp; |
ef24f6dd KM |
343 | |
344 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
345 | return ((struct vnode *)0); | |
c0de8792 KM |
346 | |
347 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 348 | loop: |
c0de8792 KM |
349 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
350 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 351 | continue; |
c0de8792 KM |
352 | /* |
353 | * Alias, but not in use, so flush it out. | |
354 | */ | |
7f7b7d89 | 355 | if (vp->v_usecount == 0) { |
c0de8792 KM |
356 | vgone(vp); |
357 | goto loop; | |
358 | } | |
ef62830d KM |
359 | if (vget(vp)) |
360 | goto loop; | |
ef24f6dd KM |
361 | break; |
362 | } | |
c0de8792 KM |
363 | if (vp == NULL || vp->v_tag != VT_NON) { |
364 | if (vp != NULL) { | |
c0de8792 | 365 | nvp->v_flag |= VALIASED; |
a45ff315 KM |
366 | vp->v_flag |= VALIASED; |
367 | vput(vp); | |
c0de8792 KM |
368 | } |
369 | MALLOC(nvp->v_specinfo, struct specinfo *, | |
370 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
371 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 372 | nvp->v_hashchain = vpp; |
c0de8792 KM |
373 | nvp->v_specnext = *vpp; |
374 | *vpp = nvp; | |
ef24f6dd KM |
375 | return ((struct vnode *)0); |
376 | } | |
2bae1875 KM |
377 | VOP_UNLOCK(vp); |
378 | vclean(vp, 0); | |
ef24f6dd KM |
379 | vp->v_op = nvp->v_op; |
380 | vp->v_tag = nvp->v_tag; | |
381 | nvp->v_type = VNON; | |
382 | insmntque(vp, mp); | |
383 | return (vp); | |
384 | } | |
385 | ||
386 | /* | |
387 | * Grab a particular vnode from the free list, increment its | |
388 | * reference count and lock it. The vnode lock bit is set the | |
389 | * vnode is being eliminated in vgone. The process is awakened | |
390 | * when the transition is completed, and an error returned to | |
391 | * indicate that the vnode is no longer usable (possibly having | |
392 | * been changed to a new file system type). | |
36d09cb1 KM |
393 | */ |
394 | vget(vp) | |
395 | register struct vnode *vp; | |
396 | { | |
397 | register struct vnode *vq; | |
398 | ||
ef24f6dd KM |
399 | if (vp->v_flag & VXLOCK) { |
400 | vp->v_flag |= VXWANT; | |
401 | sleep((caddr_t)vp, PINOD); | |
402 | return (1); | |
403 | } | |
7f7b7d89 | 404 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
405 | if (vq = vp->v_freef) |
406 | vq->v_freeb = vp->v_freeb; | |
407 | else | |
408 | vfreet = vp->v_freeb; | |
409 | *vp->v_freeb = vq; | |
410 | vp->v_freef = NULL; | |
411 | vp->v_freeb = NULL; | |
412 | } | |
36d09cb1 | 413 | VREF(vp); |
ef24f6dd KM |
414 | VOP_LOCK(vp); |
415 | return (0); | |
36d09cb1 KM |
416 | } |
417 | ||
418 | /* | |
419 | * Vnode reference, just increment the count | |
420 | */ | |
421 | void vref(vp) | |
422 | struct vnode *vp; | |
423 | { | |
424 | ||
7f7b7d89 | 425 | vp->v_usecount++; |
36d09cb1 KM |
426 | } |
427 | ||
428 | /* | |
429 | * vput(), just unlock and vrele() | |
430 | */ | |
431 | void vput(vp) | |
432 | register struct vnode *vp; | |
433 | { | |
434 | VOP_UNLOCK(vp); | |
435 | vrele(vp); | |
436 | } | |
437 | ||
438 | /* | |
439 | * Vnode release. | |
440 | * If count drops to zero, call inactive routine and return to freelist. | |
441 | */ | |
442 | void vrele(vp) | |
443 | register struct vnode *vp; | |
444 | { | |
445 | ||
446 | if (vp == NULL) | |
ef24f6dd | 447 | panic("vrele: null vp"); |
7f7b7d89 KM |
448 | vp->v_usecount--; |
449 | if (vp->v_usecount < 0) | |
0bf84b18 | 450 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 451 | if (vp->v_usecount > 0) |
36d09cb1 | 452 | return; |
36d09cb1 KM |
453 | if (vfreeh == (struct vnode *)0) { |
454 | /* | |
455 | * insert into empty list | |
456 | */ | |
457 | vfreeh = vp; | |
458 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
459 | } else { |
460 | /* | |
461 | * insert at tail of list | |
462 | */ | |
463 | *vfreet = vp; | |
464 | vp->v_freeb = vfreet; | |
36d09cb1 | 465 | } |
ef24f6dd KM |
466 | vp->v_freef = NULL; |
467 | vfreet = &vp->v_freef; | |
468 | VOP_INACTIVE(vp); | |
469 | } | |
470 | ||
7f7b7d89 KM |
471 | /* |
472 | * Page or buffer structure gets a reference. | |
473 | */ | |
474 | vhold(vp) | |
475 | register struct vnode *vp; | |
476 | { | |
477 | ||
478 | vp->v_holdcnt++; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Page or buffer structure frees a reference. | |
483 | */ | |
484 | holdrele(vp) | |
485 | register struct vnode *vp; | |
486 | { | |
487 | ||
488 | if (vp->v_holdcnt <= 0) | |
489 | panic("holdrele: holdcnt"); | |
490 | vp->v_holdcnt--; | |
491 | } | |
492 | ||
f0556f86 KM |
493 | /* |
494 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
495 | * | |
496 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
497 | * return error if any are found (nb: this is a user error, not a | |
498 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
499 | * that are found. | |
500 | */ | |
501 | int busyprt = 0; /* patch to print out busy vnodes */ | |
502 | ||
503 | vflush(mp, skipvp, flags) | |
504 | struct mount *mp; | |
505 | struct vnode *skipvp; | |
506 | int flags; | |
507 | { | |
508 | register struct vnode *vp, *nvp; | |
509 | int busy = 0; | |
510 | ||
511 | for (vp = mp->m_mounth; vp; vp = nvp) { | |
512 | nvp = vp->v_mountf; | |
513 | /* | |
514 | * Skip over a selected vnode. | |
515 | * Used by ufs to skip over the quota structure inode. | |
516 | */ | |
517 | if (vp == skipvp) | |
518 | continue; | |
519 | /* | |
7f7b7d89 | 520 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
521 | * out the vnode data structures and we are done. |
522 | */ | |
7f7b7d89 | 523 | if (vp->v_usecount == 0) { |
f0556f86 KM |
524 | vgone(vp); |
525 | continue; | |
526 | } | |
527 | /* | |
528 | * For block or character devices, revert to an | |
529 | * anonymous device. For all other files, just kill them. | |
530 | */ | |
531 | if (flags & MNT_FORCE) { | |
532 | if (vp->v_type != VBLK && vp->v_type != VCHR) { | |
533 | vgone(vp); | |
534 | } else { | |
535 | vclean(vp, 0); | |
536 | vp->v_op = &spec_vnodeops; | |
537 | insmntque(vp, (struct mount *)0); | |
538 | } | |
539 | continue; | |
540 | } | |
541 | if (busyprt) | |
0bf84b18 | 542 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
543 | busy++; |
544 | } | |
545 | if (busy) | |
546 | return (EBUSY); | |
547 | return (0); | |
548 | } | |
549 | ||
ef24f6dd KM |
550 | /* |
551 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 552 | */ |
2bae1875 | 553 | void vclean(vp, doclose) |
ef24f6dd | 554 | register struct vnode *vp; |
2bae1875 | 555 | long doclose; |
ef24f6dd KM |
556 | { |
557 | struct vnodeops *origops; | |
2bae1875 | 558 | int active; |
ef24f6dd | 559 | |
2bae1875 KM |
560 | /* |
561 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
562 | * If so we have to reference it before we clean it out |
563 | * so that its count cannot fall to zero and generate a | |
564 | * race against ourselves to recycle it. | |
2bae1875 | 565 | */ |
7f7b7d89 | 566 | if (active = vp->v_usecount) |
2bae1875 | 567 | VREF(vp); |
2bae1875 KM |
568 | /* |
569 | * Prevent the vnode from being recycled or | |
570 | * brought into use while we clean it out. | |
571 | */ | |
0bf84b18 KM |
572 | if (vp->v_flag & VXLOCK) |
573 | panic("vclean: deadlock"); | |
ef24f6dd | 574 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
575 | /* |
576 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
577 | * have the object locked while it cleans it out. The VOP_LOCK | |
578 | * ensures that the VOP_INACTIVE routine is done with its work. | |
579 | * For active vnodes, it ensures that no other activity can | |
580 | * occur while the buffer list is being cleaned out. | |
581 | */ | |
582 | VOP_LOCK(vp); | |
583 | if (doclose) | |
584 | vinvalbuf(vp, 1); | |
ef24f6dd KM |
585 | /* |
586 | * Prevent any further operations on the vnode from | |
587 | * being passed through to the old file system. | |
588 | */ | |
589 | origops = vp->v_op; | |
590 | vp->v_op = &dead_vnodeops; | |
591 | vp->v_tag = VT_NON; | |
592 | /* | |
2bae1875 KM |
593 | * If purging an active vnode, it must be unlocked, closed, |
594 | * and deactivated before being reclaimed. | |
ef24f6dd | 595 | */ |
0bf84b18 | 596 | (*(origops->vn_unlock))(vp); |
2bae1875 | 597 | if (active) { |
2bae1875 KM |
598 | if (doclose) |
599 | (*(origops->vn_close))(vp, 0, NOCRED); | |
ef24f6dd KM |
600 | (*(origops->vn_inactive))(vp); |
601 | } | |
602 | /* | |
603 | * Reclaim the vnode. | |
604 | */ | |
605 | if ((*(origops->vn_reclaim))(vp)) | |
606 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
607 | if (active) |
608 | vrele(vp); | |
ef24f6dd KM |
609 | /* |
610 | * Done with purge, notify sleepers in vget of the grim news. | |
611 | */ | |
612 | vp->v_flag &= ~VXLOCK; | |
613 | if (vp->v_flag & VXWANT) { | |
614 | vp->v_flag &= ~VXWANT; | |
615 | wakeup((caddr_t)vp); | |
616 | } | |
617 | } | |
618 | ||
ef62830d KM |
619 | /* |
620 | * Eliminate all activity associated with the requested vnode | |
621 | * and with all vnodes aliased to the requested vnode. | |
622 | */ | |
623 | void vgoneall(vp) | |
624 | register struct vnode *vp; | |
625 | { | |
7f7b7d89 | 626 | register struct vnode *vq; |
ef62830d | 627 | |
7f7b7d89 KM |
628 | while (vp->v_flag & VALIASED) { |
629 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
160df0cd KM |
630 | if (vq->v_rdev != vp->v_rdev || |
631 | vq->v_type != vp->v_type || vp == vq) | |
ef62830d KM |
632 | continue; |
633 | vgone(vq); | |
7f7b7d89 | 634 | break; |
ef62830d KM |
635 | } |
636 | } | |
637 | vgone(vp); | |
638 | } | |
639 | ||
ef24f6dd KM |
640 | /* |
641 | * Eliminate all activity associated with a vnode | |
642 | * in preparation for reuse. | |
643 | */ | |
644 | void vgone(vp) | |
645 | register struct vnode *vp; | |
646 | { | |
7f7b7d89 | 647 | register struct vnode *vq; |
c0de8792 KM |
648 | struct vnode *vx; |
649 | long count; | |
ef24f6dd | 650 | |
ef24f6dd KM |
651 | /* |
652 | * Clean out the filesystem specific data. | |
653 | */ | |
2bae1875 | 654 | vclean(vp, 1); |
ef24f6dd KM |
655 | /* |
656 | * Delete from old mount point vnode list, if on one. | |
657 | */ | |
658 | if (vp->v_mountb) { | |
659 | if (vq = vp->v_mountf) | |
660 | vq->v_mountb = vp->v_mountb; | |
661 | *vp->v_mountb = vq; | |
662 | vp->v_mountf = NULL; | |
663 | vp->v_mountb = NULL; | |
664 | } | |
665 | /* | |
666 | * If special device, remove it from special device alias list. | |
667 | */ | |
668 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
669 | if (*vp->v_hashchain == vp) { |
670 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 671 | } else { |
7f7b7d89 | 672 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 673 | if (vq->v_specnext != vp) |
ef24f6dd | 674 | continue; |
c0de8792 | 675 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
676 | break; |
677 | } | |
c0de8792 | 678 | if (vq == NULL) |
ef24f6dd KM |
679 | panic("missing bdev"); |
680 | } | |
c0de8792 | 681 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
682 | count = 0; |
683 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
684 | if (vq->v_rdev != vp->v_rdev || |
685 | vq->v_type != vp->v_type) | |
c0de8792 KM |
686 | continue; |
687 | count++; | |
688 | vx = vq; | |
689 | } | |
690 | if (count == 0) | |
691 | panic("missing alias"); | |
692 | if (count == 1) | |
693 | vx->v_flag &= ~VALIASED; | |
694 | vp->v_flag &= ~VALIASED; | |
695 | } | |
696 | FREE(vp->v_specinfo, M_VNODE); | |
697 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
698 | } |
699 | /* | |
700 | * If it is on the freelist, move it to the head of the list. | |
701 | */ | |
702 | if (vp->v_freeb) { | |
703 | if (vq = vp->v_freef) | |
704 | vq->v_freeb = vp->v_freeb; | |
705 | else | |
706 | vfreet = vp->v_freeb; | |
707 | *vp->v_freeb = vq; | |
708 | vp->v_freef = vfreeh; | |
709 | vp->v_freeb = &vfreeh; | |
710 | vfreeh->v_freeb = &vp->v_freef; | |
711 | vfreeh = vp; | |
712 | } | |
2bae1875 | 713 | vp->v_type = VBAD; |
36d09cb1 | 714 | } |
ef62830d | 715 | |
2bcd6066 KM |
716 | /* |
717 | * Lookup a vnode by device number. | |
718 | */ | |
719 | vfinddev(dev, type, vpp) | |
720 | dev_t dev; | |
721 | enum vtype type; | |
722 | struct vnode **vpp; | |
723 | { | |
724 | register struct vnode *vp; | |
725 | ||
726 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
727 | if (dev != vp->v_rdev || type != vp->v_type) | |
728 | continue; | |
729 | *vpp = vp; | |
730 | return (0); | |
731 | } | |
732 | return (1); | |
733 | } | |
734 | ||
ef62830d KM |
735 | /* |
736 | * Calculate the total number of references to a special device. | |
737 | */ | |
738 | vcount(vp) | |
739 | register struct vnode *vp; | |
740 | { | |
7f7b7d89 | 741 | register struct vnode *vq; |
ef62830d KM |
742 | int count; |
743 | ||
744 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 745 | return (vp->v_usecount); |
ef62830d | 746 | loop: |
7f7b7d89 | 747 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 748 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
749 | continue; |
750 | /* | |
751 | * Alias, but not in use, so flush it out. | |
752 | */ | |
7f7b7d89 | 753 | if (vq->v_usecount == 0) { |
ef62830d KM |
754 | vgone(vq); |
755 | goto loop; | |
756 | } | |
7f7b7d89 | 757 | count += vq->v_usecount; |
ef62830d KM |
758 | } |
759 | return (count); | |
760 | } | |
0bf84b18 KM |
761 | |
762 | /* | |
763 | * Print out a description of a vnode. | |
764 | */ | |
765 | static char *typename[] = | |
766 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VBAD" }; | |
767 | ||
768 | vprint(label, vp) | |
769 | char *label; | |
770 | register struct vnode *vp; | |
771 | { | |
f2f730c6 | 772 | char buf[64]; |
0bf84b18 KM |
773 | |
774 | if (label != NULL) | |
775 | printf("%s: ", label); | |
f2f730c6 | 776 | printf("type %s, usecount %d, refcount %d,", typename[vp->v_type], |
7f7b7d89 | 777 | vp->v_usecount, vp->v_holdcnt); |
f2f730c6 KM |
778 | buf[0] = '\0'; |
779 | if (vp->v_flag & VROOT) | |
780 | strcat(buf, "|VROOT"); | |
781 | if (vp->v_flag & VTEXT) | |
782 | strcat(buf, "|VTEXT"); | |
783 | if (vp->v_flag & VXLOCK) | |
784 | strcat(buf, "|VXLOCK"); | |
785 | if (vp->v_flag & VXWANT) | |
786 | strcat(buf, "|VXWANT"); | |
787 | if (vp->v_flag & VEXLOCK) | |
788 | strcat(buf, "|VEXLOCK"); | |
789 | if (vp->v_flag & VSHLOCK) | |
790 | strcat(buf, "|VSHLOCK"); | |
791 | if (vp->v_flag & VLWAIT) | |
792 | strcat(buf, "|VLWAIT"); | |
793 | if (vp->v_flag & VALIASED) | |
794 | strcat(buf, "|VALIASED"); | |
795 | if (vp->v_flag & VBWAIT) | |
796 | strcat(buf, "|VBWAIT"); | |
797 | if (buf[0] != '\0') | |
798 | printf(" flags (%s)", &buf[1]); | |
799 | printf("\n\t"); | |
0bf84b18 KM |
800 | VOP_PRINT(vp); |
801 | } | |
f2f730c6 KM |
802 | |
803 | strcat(src, append) | |
804 | register char *src, *append; | |
805 | { | |
806 | ||
807 | for (; *src; ++src) | |
808 | /* void */; | |
809 | while (*src++ = *append++) | |
810 | /* void */; | |
811 | } |