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 | * | |
2c957a90 | 17 | * @(#)vfs_subr.c 7.46 (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"); | |
54fb9dc2 KM |
45 | mp->mnt_prev->mnt_next = mp->mnt_next; |
46 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
47 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
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 | ||
54fb9dc2 KM |
59 | while(mp->mnt_flag & MNT_MLOCK) { |
60 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
61 | sleep((caddr_t)mp, PVFS); |
62 | } | |
54fb9dc2 | 63 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
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 | ||
54fb9dc2 | 76 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 77 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
78 | mp->mnt_flag &= ~MNT_MLOCK; |
79 | if (mp->mnt_flag & MNT_MWAIT) { | |
80 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
81 | wakeup((caddr_t)mp); |
82 | } | |
83 | } | |
84 | ||
36ef03ec KM |
85 | /* |
86 | * Mark a mount point as busy. | |
87 | * Used to synchronize access and to delay unmounting. | |
88 | */ | |
89 | vfs_busy(mp) | |
90 | register struct mount *mp; | |
91 | { | |
92 | ||
54fb9dc2 KM |
93 | while(mp->mnt_flag & MNT_MPBUSY) { |
94 | mp->mnt_flag |= MNT_MPWANT; | |
95 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 96 | } |
d8b63609 KM |
97 | if (mp->mnt_flag & MNT_UNMOUNT) |
98 | return (1); | |
54fb9dc2 | 99 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
100 | return (0); |
101 | } | |
102 | ||
103 | /* | |
104 | * Free a busy filesystem. | |
105 | * Panic if filesystem is not busy. | |
106 | */ | |
107 | void | |
108 | vfs_unbusy(mp) | |
109 | register struct mount *mp; | |
110 | { | |
111 | ||
54fb9dc2 | 112 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 113 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
114 | mp->mnt_flag &= ~MNT_MPBUSY; |
115 | if (mp->mnt_flag & MNT_MPWANT) { | |
116 | mp->mnt_flag &= ~MNT_MPWANT; | |
117 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
118 | } |
119 | } | |
120 | ||
3c4390e8 KM |
121 | /* |
122 | * Lookup a mount point by filesystem identifier. | |
123 | */ | |
124 | struct mount * | |
125 | getvfs(fsid) | |
126 | fsid_t *fsid; | |
127 | { | |
128 | register struct mount *mp; | |
129 | ||
d713f801 KM |
130 | mp = rootfs; |
131 | do { | |
54fb9dc2 KM |
132 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
133 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 134 | return (mp); |
3c4390e8 | 135 | } |
54fb9dc2 | 136 | mp = mp->mnt_next; |
d713f801 KM |
137 | } while (mp != rootfs); |
138 | return ((struct mount *)0); | |
3c4390e8 KM |
139 | } |
140 | ||
141 | /* | |
142 | * Set vnode attributes to VNOVAL | |
143 | */ | |
144 | void vattr_null(vap) | |
145 | register struct vattr *vap; | |
146 | { | |
147 | ||
148 | vap->va_type = VNON; | |
149 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = | |
150 | vap->va_fsid = vap->va_fileid = vap->va_size = | |
8fae943a KM |
151 | vap->va_size_rsv = vap->va_blocksize = vap->va_rdev = |
152 | vap->va_bytes = vap->va_bytes_rsv = | |
3c4390e8 KM |
153 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
154 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
155 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
156 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 157 | } |
c60798ca KM |
158 | |
159 | /* | |
160 | * Initialize a nameidata structure | |
161 | */ | |
162 | ndinit(ndp) | |
163 | register struct nameidata *ndp; | |
164 | { | |
165 | ||
166 | bzero((caddr_t)ndp, sizeof(struct nameidata)); | |
167 | ndp->ni_iov = &ndp->ni_nd.nd_iovec; | |
168 | ndp->ni_iovcnt = 1; | |
169 | ndp->ni_base = (caddr_t)&ndp->ni_dent; | |
170 | ndp->ni_rw = UIO_WRITE; | |
4dbe3531 | 171 | ndp->ni_uioseg = UIO_SYSSPACE; |
c60798ca KM |
172 | } |
173 | ||
174 | /* | |
175 | * Duplicate a nameidata structure | |
176 | */ | |
177 | nddup(ndp, newndp) | |
178 | register struct nameidata *ndp, *newndp; | |
179 | { | |
180 | ||
181 | ndinit(newndp); | |
182 | newndp->ni_cdir = ndp->ni_cdir; | |
8fe1c702 | 183 | VREF(newndp->ni_cdir); |
c60798ca KM |
184 | newndp->ni_rdir = ndp->ni_rdir; |
185 | if (newndp->ni_rdir) | |
8fe1c702 | 186 | VREF(newndp->ni_rdir); |
c60798ca KM |
187 | newndp->ni_cred = ndp->ni_cred; |
188 | crhold(newndp->ni_cred); | |
189 | } | |
190 | ||
191 | /* | |
192 | * Release a nameidata structure | |
193 | */ | |
194 | ndrele(ndp) | |
195 | register struct nameidata *ndp; | |
196 | { | |
197 | ||
198 | vrele(ndp->ni_cdir); | |
199 | if (ndp->ni_rdir) | |
200 | vrele(ndp->ni_rdir); | |
201 | crfree(ndp->ni_cred); | |
202 | } | |
36d09cb1 KM |
203 | |
204 | /* | |
205 | * Routines having to do with the management of the vnode table. | |
206 | */ | |
207 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 208 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 209 | extern void vclean(); |
1a80f56e | 210 | long numvnodes; |
d3664d8f | 211 | struct vattr va_null; |
c0de8792 | 212 | |
36d09cb1 | 213 | /* |
ef24f6dd | 214 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 215 | */ |
ef24f6dd | 216 | vfsinit() |
36d09cb1 | 217 | { |
ef24f6dd | 218 | struct vfsops **vfsp; |
36d09cb1 | 219 | |
ef24f6dd KM |
220 | /* |
221 | * Initialize the vnode name cache | |
222 | */ | |
223 | nchinit(); | |
224 | /* | |
225 | * Initialize each file system type. | |
226 | */ | |
d3664d8f | 227 | vattr_null(&va_null); |
ef24f6dd KM |
228 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
229 | if (*vfsp == NULL) | |
230 | continue; | |
231 | (*(*vfsp)->vfs_init)(); | |
232 | } | |
36d09cb1 KM |
233 | } |
234 | ||
235 | /* | |
236 | * Return the next vnode from the free list. | |
237 | */ | |
238 | getnewvnode(tag, mp, vops, vpp) | |
239 | enum vtagtype tag; | |
240 | struct mount *mp; | |
241 | struct vnodeops *vops; | |
242 | struct vnode **vpp; | |
243 | { | |
244 | register struct vnode *vp, *vq; | |
245 | ||
1a80f56e KM |
246 | if (numvnodes < desiredvnodes) { |
247 | vp = (struct vnode *)malloc(sizeof *vp, M_VNODE, M_WAITOK); | |
248 | bzero((char *)vp, sizeof *vp); | |
249 | numvnodes++; | |
250 | } else { | |
251 | if ((vp = vfreeh) == NULL) { | |
252 | tablefull("vnode"); | |
253 | *vpp = 0; | |
254 | return (ENFILE); | |
255 | } | |
256 | if (vp->v_usecount) | |
257 | panic("free vnode isn't"); | |
258 | if (vq = vp->v_freef) | |
259 | vq->v_freeb = &vfreeh; | |
260 | else | |
261 | vfreet = &vfreeh; | |
262 | vfreeh = vq; | |
263 | vp->v_freef = NULL; | |
264 | vp->v_freeb = NULL; | |
265 | if (vp->v_type != VBAD) | |
266 | vgone(vp); | |
267 | vp->v_flag = 0; | |
268 | vp->v_shlockc = 0; | |
269 | vp->v_exlockc = 0; | |
270 | vp->v_lastr = 0; | |
271 | vp->v_socket = 0; | |
36d09cb1 | 272 | } |
b027498b | 273 | vp->v_type = VNON; |
36d09cb1 KM |
274 | cache_purge(vp); |
275 | vp->v_tag = tag; | |
ef24f6dd | 276 | vp->v_op = vops; |
36d09cb1 KM |
277 | insmntque(vp, mp); |
278 | VREF(vp); | |
279 | *vpp = vp; | |
280 | return (0); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Move a vnode from one mount queue to another. | |
285 | */ | |
286 | insmntque(vp, mp) | |
287 | register struct vnode *vp; | |
288 | register struct mount *mp; | |
289 | { | |
290 | struct vnode *vq; | |
291 | ||
292 | /* | |
293 | * Delete from old mount point vnode list, if on one. | |
294 | */ | |
295 | if (vp->v_mountb) { | |
296 | if (vq = vp->v_mountf) | |
297 | vq->v_mountb = vp->v_mountb; | |
298 | *vp->v_mountb = vq; | |
299 | } | |
300 | /* | |
301 | * Insert into list of vnodes for the new mount point, if available. | |
302 | */ | |
a45ff315 | 303 | vp->v_mount = mp; |
36d09cb1 KM |
304 | if (mp == NULL) { |
305 | vp->v_mountf = NULL; | |
306 | vp->v_mountb = NULL; | |
307 | return; | |
308 | } | |
54fb9dc2 KM |
309 | if (mp->mnt_mounth) { |
310 | vp->v_mountf = mp->mnt_mounth; | |
311 | vp->v_mountb = &mp->mnt_mounth; | |
312 | mp->mnt_mounth->v_mountb = &vp->v_mountf; | |
313 | mp->mnt_mounth = vp; | |
36d09cb1 | 314 | } else { |
54fb9dc2 KM |
315 | mp->mnt_mounth = vp; |
316 | vp->v_mountb = &mp->mnt_mounth; | |
36d09cb1 KM |
317 | vp->v_mountf = NULL; |
318 | } | |
319 | } | |
320 | ||
321 | /* | |
ef24f6dd KM |
322 | * Create a vnode for a block device. |
323 | * Used for root filesystem, argdev, and swap areas. | |
324 | * Also used for memory file system special devices. | |
325 | */ | |
326 | bdevvp(dev, vpp) | |
327 | dev_t dev; | |
328 | struct vnode **vpp; | |
329 | { | |
ef24f6dd KM |
330 | register struct vnode *vp; |
331 | struct vnode *nvp; | |
332 | int error; | |
333 | ||
4ef5d036 | 334 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
335 | if (error) { |
336 | *vpp = 0; | |
337 | return (error); | |
338 | } | |
339 | vp = nvp; | |
340 | vp->v_type = VBLK; | |
c0de8792 | 341 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
342 | vput(vp); |
343 | vp = nvp; | |
344 | } | |
345 | *vpp = vp; | |
346 | return (0); | |
347 | } | |
348 | ||
349 | /* | |
350 | * Check to see if the new vnode represents a special device | |
351 | * for which we already have a vnode (either because of | |
352 | * bdevvp() or because of a different vnode representing | |
353 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 354 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
355 | * caller is responsible for filling it with its new contents. |
356 | */ | |
357 | struct vnode * | |
c0de8792 | 358 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 359 | register struct vnode *nvp; |
c0de8792 | 360 | dev_t nvp_rdev; |
ef24f6dd KM |
361 | struct mount *mp; |
362 | { | |
363 | register struct vnode *vp; | |
c0de8792 | 364 | struct vnode **vpp; |
ef24f6dd KM |
365 | |
366 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 367 | return (NULLVP); |
c0de8792 KM |
368 | |
369 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 370 | loop: |
c0de8792 KM |
371 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
372 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 373 | continue; |
c0de8792 KM |
374 | /* |
375 | * Alias, but not in use, so flush it out. | |
376 | */ | |
7f7b7d89 | 377 | if (vp->v_usecount == 0) { |
c0de8792 KM |
378 | vgone(vp); |
379 | goto loop; | |
380 | } | |
ef62830d KM |
381 | if (vget(vp)) |
382 | goto loop; | |
ef24f6dd KM |
383 | break; |
384 | } | |
c0de8792 | 385 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
386 | MALLOC(nvp->v_specinfo, struct specinfo *, |
387 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
388 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 389 | nvp->v_hashchain = vpp; |
c0de8792 | 390 | nvp->v_specnext = *vpp; |
2c957a90 | 391 | nvp->v_specflags = 0; |
c0de8792 | 392 | *vpp = nvp; |
40452d5e KM |
393 | if (vp != NULL) { |
394 | nvp->v_flag |= VALIASED; | |
395 | vp->v_flag |= VALIASED; | |
396 | vput(vp); | |
397 | } | |
54fb9dc2 | 398 | return (NULLVP); |
ef24f6dd | 399 | } |
2bae1875 KM |
400 | VOP_UNLOCK(vp); |
401 | vclean(vp, 0); | |
ef24f6dd KM |
402 | vp->v_op = nvp->v_op; |
403 | vp->v_tag = nvp->v_tag; | |
404 | nvp->v_type = VNON; | |
405 | insmntque(vp, mp); | |
406 | return (vp); | |
407 | } | |
408 | ||
409 | /* | |
410 | * Grab a particular vnode from the free list, increment its | |
411 | * reference count and lock it. The vnode lock bit is set the | |
412 | * vnode is being eliminated in vgone. The process is awakened | |
413 | * when the transition is completed, and an error returned to | |
414 | * indicate that the vnode is no longer usable (possibly having | |
415 | * been changed to a new file system type). | |
36d09cb1 KM |
416 | */ |
417 | vget(vp) | |
418 | register struct vnode *vp; | |
419 | { | |
420 | register struct vnode *vq; | |
421 | ||
ef24f6dd KM |
422 | if (vp->v_flag & VXLOCK) { |
423 | vp->v_flag |= VXWANT; | |
424 | sleep((caddr_t)vp, PINOD); | |
425 | return (1); | |
426 | } | |
7f7b7d89 | 427 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
428 | if (vq = vp->v_freef) |
429 | vq->v_freeb = vp->v_freeb; | |
430 | else | |
431 | vfreet = vp->v_freeb; | |
432 | *vp->v_freeb = vq; | |
433 | vp->v_freef = NULL; | |
434 | vp->v_freeb = NULL; | |
435 | } | |
36d09cb1 | 436 | VREF(vp); |
ef24f6dd KM |
437 | VOP_LOCK(vp); |
438 | return (0); | |
36d09cb1 KM |
439 | } |
440 | ||
441 | /* | |
442 | * Vnode reference, just increment the count | |
443 | */ | |
444 | void vref(vp) | |
445 | struct vnode *vp; | |
446 | { | |
447 | ||
7f7b7d89 | 448 | vp->v_usecount++; |
36d09cb1 KM |
449 | } |
450 | ||
451 | /* | |
452 | * vput(), just unlock and vrele() | |
453 | */ | |
454 | void vput(vp) | |
455 | register struct vnode *vp; | |
456 | { | |
457 | VOP_UNLOCK(vp); | |
458 | vrele(vp); | |
459 | } | |
460 | ||
461 | /* | |
462 | * Vnode release. | |
463 | * If count drops to zero, call inactive routine and return to freelist. | |
464 | */ | |
465 | void vrele(vp) | |
466 | register struct vnode *vp; | |
467 | { | |
468 | ||
469 | if (vp == NULL) | |
ef24f6dd | 470 | panic("vrele: null vp"); |
7f7b7d89 KM |
471 | vp->v_usecount--; |
472 | if (vp->v_usecount < 0) | |
0bf84b18 | 473 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 474 | if (vp->v_usecount > 0) |
36d09cb1 | 475 | return; |
54fb9dc2 | 476 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
477 | /* |
478 | * insert into empty list | |
479 | */ | |
480 | vfreeh = vp; | |
481 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
482 | } else { |
483 | /* | |
484 | * insert at tail of list | |
485 | */ | |
486 | *vfreet = vp; | |
487 | vp->v_freeb = vfreet; | |
36d09cb1 | 488 | } |
ef24f6dd KM |
489 | vp->v_freef = NULL; |
490 | vfreet = &vp->v_freef; | |
491 | VOP_INACTIVE(vp); | |
492 | } | |
493 | ||
7f7b7d89 KM |
494 | /* |
495 | * Page or buffer structure gets a reference. | |
496 | */ | |
497 | vhold(vp) | |
498 | register struct vnode *vp; | |
499 | { | |
500 | ||
501 | vp->v_holdcnt++; | |
502 | } | |
503 | ||
504 | /* | |
505 | * Page or buffer structure frees a reference. | |
506 | */ | |
507 | holdrele(vp) | |
508 | register struct vnode *vp; | |
509 | { | |
510 | ||
511 | if (vp->v_holdcnt <= 0) | |
512 | panic("holdrele: holdcnt"); | |
513 | vp->v_holdcnt--; | |
514 | } | |
515 | ||
f0556f86 KM |
516 | /* |
517 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
518 | * | |
519 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
520 | * return error if any are found (nb: this is a user error, not a | |
521 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
522 | * that are found. | |
523 | */ | |
524 | int busyprt = 0; /* patch to print out busy vnodes */ | |
525 | ||
526 | vflush(mp, skipvp, flags) | |
527 | struct mount *mp; | |
528 | struct vnode *skipvp; | |
529 | int flags; | |
530 | { | |
531 | register struct vnode *vp, *nvp; | |
532 | int busy = 0; | |
533 | ||
54fb9dc2 | 534 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 535 | panic("vflush: not busy"); |
4597dd33 | 536 | loop: |
54fb9dc2 | 537 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
538 | if (vp->v_mount != mp) |
539 | goto loop; | |
f0556f86 KM |
540 | nvp = vp->v_mountf; |
541 | /* | |
542 | * Skip over a selected vnode. | |
f0556f86 KM |
543 | */ |
544 | if (vp == skipvp) | |
545 | continue; | |
36ef03ec KM |
546 | /* |
547 | * Skip over a vnodes marked VSYSTEM. | |
548 | */ | |
549 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
550 | continue; | |
f0556f86 | 551 | /* |
7f7b7d89 | 552 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
553 | * out the vnode data structures and we are done. |
554 | */ | |
7f7b7d89 | 555 | if (vp->v_usecount == 0) { |
f0556f86 KM |
556 | vgone(vp); |
557 | continue; | |
558 | } | |
559 | /* | |
560 | * For block or character devices, revert to an | |
561 | * anonymous device. For all other files, just kill them. | |
562 | */ | |
36ef03ec | 563 | if (flags & FORCECLOSE) { |
f0556f86 KM |
564 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
565 | vgone(vp); | |
566 | } else { | |
567 | vclean(vp, 0); | |
568 | vp->v_op = &spec_vnodeops; | |
569 | insmntque(vp, (struct mount *)0); | |
570 | } | |
571 | continue; | |
572 | } | |
573 | if (busyprt) | |
0bf84b18 | 574 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
575 | busy++; |
576 | } | |
577 | if (busy) | |
578 | return (EBUSY); | |
579 | return (0); | |
580 | } | |
581 | ||
ef24f6dd KM |
582 | /* |
583 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 584 | */ |
36ef03ec | 585 | void vclean(vp, flags) |
ef24f6dd | 586 | register struct vnode *vp; |
36ef03ec | 587 | long flags; |
ef24f6dd KM |
588 | { |
589 | struct vnodeops *origops; | |
2bae1875 | 590 | int active; |
ef24f6dd | 591 | |
2bae1875 KM |
592 | /* |
593 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
594 | * If so we have to reference it before we clean it out |
595 | * so that its count cannot fall to zero and generate a | |
596 | * race against ourselves to recycle it. | |
2bae1875 | 597 | */ |
7f7b7d89 | 598 | if (active = vp->v_usecount) |
2bae1875 | 599 | VREF(vp); |
2bae1875 KM |
600 | /* |
601 | * Prevent the vnode from being recycled or | |
602 | * brought into use while we clean it out. | |
603 | */ | |
0bf84b18 KM |
604 | if (vp->v_flag & VXLOCK) |
605 | panic("vclean: deadlock"); | |
ef24f6dd | 606 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
607 | /* |
608 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
609 | * have the object locked while it cleans it out. The VOP_LOCK | |
610 | * ensures that the VOP_INACTIVE routine is done with its work. | |
611 | * For active vnodes, it ensures that no other activity can | |
612 | * occur while the buffer list is being cleaned out. | |
613 | */ | |
614 | VOP_LOCK(vp); | |
36ef03ec | 615 | if (flags & DOCLOSE) |
0bf84b18 | 616 | vinvalbuf(vp, 1); |
ef24f6dd KM |
617 | /* |
618 | * Prevent any further operations on the vnode from | |
619 | * being passed through to the old file system. | |
620 | */ | |
621 | origops = vp->v_op; | |
622 | vp->v_op = &dead_vnodeops; | |
623 | vp->v_tag = VT_NON; | |
624 | /* | |
2bae1875 KM |
625 | * If purging an active vnode, it must be unlocked, closed, |
626 | * and deactivated before being reclaimed. | |
ef24f6dd | 627 | */ |
0bf84b18 | 628 | (*(origops->vn_unlock))(vp); |
2bae1875 | 629 | if (active) { |
36ef03ec | 630 | if (flags & DOCLOSE) |
2bae1875 | 631 | (*(origops->vn_close))(vp, 0, NOCRED); |
ef24f6dd KM |
632 | (*(origops->vn_inactive))(vp); |
633 | } | |
634 | /* | |
635 | * Reclaim the vnode. | |
636 | */ | |
637 | if ((*(origops->vn_reclaim))(vp)) | |
638 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
639 | if (active) |
640 | vrele(vp); | |
ef24f6dd KM |
641 | /* |
642 | * Done with purge, notify sleepers in vget of the grim news. | |
643 | */ | |
644 | vp->v_flag &= ~VXLOCK; | |
645 | if (vp->v_flag & VXWANT) { | |
646 | vp->v_flag &= ~VXWANT; | |
647 | wakeup((caddr_t)vp); | |
648 | } | |
649 | } | |
650 | ||
ef62830d KM |
651 | /* |
652 | * Eliminate all activity associated with the requested vnode | |
653 | * and with all vnodes aliased to the requested vnode. | |
654 | */ | |
655 | void vgoneall(vp) | |
656 | register struct vnode *vp; | |
657 | { | |
7f7b7d89 | 658 | register struct vnode *vq; |
ef62830d | 659 | |
7a7b3a95 KM |
660 | if (vp->v_flag & VALIASED) { |
661 | /* | |
662 | * If a vgone (or vclean) is already in progress, | |
663 | * wait until it is done and return. | |
664 | */ | |
665 | if (vp->v_flag & VXLOCK) { | |
666 | vp->v_flag |= VXWANT; | |
667 | sleep((caddr_t)vp, PINOD); | |
668 | return; | |
669 | } | |
670 | /* | |
671 | * Ensure that vp will not be vgone'd while we | |
672 | * are eliminating its aliases. | |
673 | */ | |
674 | vp->v_flag |= VXLOCK; | |
675 | while (vp->v_flag & VALIASED) { | |
676 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
677 | if (vq->v_rdev != vp->v_rdev || | |
678 | vq->v_type != vp->v_type || vp == vq) | |
679 | continue; | |
680 | vgone(vq); | |
681 | break; | |
682 | } | |
ef62830d | 683 | } |
7a7b3a95 KM |
684 | /* |
685 | * Remove the lock so that vgone below will | |
686 | * really eliminate the vnode after which time | |
687 | * vgone will awaken any sleepers. | |
688 | */ | |
689 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
690 | } |
691 | vgone(vp); | |
692 | } | |
693 | ||
ef24f6dd KM |
694 | /* |
695 | * Eliminate all activity associated with a vnode | |
696 | * in preparation for reuse. | |
697 | */ | |
698 | void vgone(vp) | |
699 | register struct vnode *vp; | |
700 | { | |
7f7b7d89 | 701 | register struct vnode *vq; |
c0de8792 KM |
702 | struct vnode *vx; |
703 | long count; | |
ef24f6dd | 704 | |
4f55e3ec KM |
705 | /* |
706 | * If a vgone (or vclean) is already in progress, | |
707 | * wait until it is done and return. | |
708 | */ | |
709 | if (vp->v_flag & VXLOCK) { | |
710 | vp->v_flag |= VXWANT; | |
711 | sleep((caddr_t)vp, PINOD); | |
712 | return; | |
713 | } | |
ef24f6dd KM |
714 | /* |
715 | * Clean out the filesystem specific data. | |
716 | */ | |
36ef03ec | 717 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
718 | /* |
719 | * Delete from old mount point vnode list, if on one. | |
720 | */ | |
721 | if (vp->v_mountb) { | |
722 | if (vq = vp->v_mountf) | |
723 | vq->v_mountb = vp->v_mountb; | |
724 | *vp->v_mountb = vq; | |
725 | vp->v_mountf = NULL; | |
726 | vp->v_mountb = NULL; | |
727 | } | |
728 | /* | |
729 | * If special device, remove it from special device alias list. | |
730 | */ | |
731 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
732 | if (*vp->v_hashchain == vp) { |
733 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 734 | } else { |
7f7b7d89 | 735 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 736 | if (vq->v_specnext != vp) |
ef24f6dd | 737 | continue; |
c0de8792 | 738 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
739 | break; |
740 | } | |
c0de8792 | 741 | if (vq == NULL) |
ef24f6dd KM |
742 | panic("missing bdev"); |
743 | } | |
c0de8792 | 744 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
745 | count = 0; |
746 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
747 | if (vq->v_rdev != vp->v_rdev || |
748 | vq->v_type != vp->v_type) | |
c0de8792 KM |
749 | continue; |
750 | count++; | |
751 | vx = vq; | |
752 | } | |
753 | if (count == 0) | |
754 | panic("missing alias"); | |
755 | if (count == 1) | |
756 | vx->v_flag &= ~VALIASED; | |
757 | vp->v_flag &= ~VALIASED; | |
758 | } | |
759 | FREE(vp->v_specinfo, M_VNODE); | |
760 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
761 | } |
762 | /* | |
763 | * If it is on the freelist, move it to the head of the list. | |
764 | */ | |
765 | if (vp->v_freeb) { | |
766 | if (vq = vp->v_freef) | |
767 | vq->v_freeb = vp->v_freeb; | |
768 | else | |
769 | vfreet = vp->v_freeb; | |
770 | *vp->v_freeb = vq; | |
771 | vp->v_freef = vfreeh; | |
772 | vp->v_freeb = &vfreeh; | |
773 | vfreeh->v_freeb = &vp->v_freef; | |
774 | vfreeh = vp; | |
775 | } | |
2bae1875 | 776 | vp->v_type = VBAD; |
36d09cb1 | 777 | } |
ef62830d | 778 | |
2bcd6066 KM |
779 | /* |
780 | * Lookup a vnode by device number. | |
781 | */ | |
782 | vfinddev(dev, type, vpp) | |
783 | dev_t dev; | |
784 | enum vtype type; | |
785 | struct vnode **vpp; | |
786 | { | |
787 | register struct vnode *vp; | |
788 | ||
789 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
790 | if (dev != vp->v_rdev || type != vp->v_type) | |
791 | continue; | |
792 | *vpp = vp; | |
793 | return (0); | |
794 | } | |
795 | return (1); | |
796 | } | |
797 | ||
ef62830d KM |
798 | /* |
799 | * Calculate the total number of references to a special device. | |
800 | */ | |
801 | vcount(vp) | |
802 | register struct vnode *vp; | |
803 | { | |
7f7b7d89 | 804 | register struct vnode *vq; |
ef62830d KM |
805 | int count; |
806 | ||
807 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 808 | return (vp->v_usecount); |
ef62830d | 809 | loop: |
7f7b7d89 | 810 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 811 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
812 | continue; |
813 | /* | |
814 | * Alias, but not in use, so flush it out. | |
815 | */ | |
7f7b7d89 | 816 | if (vq->v_usecount == 0) { |
ef62830d KM |
817 | vgone(vq); |
818 | goto loop; | |
819 | } | |
7f7b7d89 | 820 | count += vq->v_usecount; |
ef62830d KM |
821 | } |
822 | return (count); | |
823 | } | |
0bf84b18 KM |
824 | |
825 | /* | |
826 | * Print out a description of a vnode. | |
827 | */ | |
828 | static char *typename[] = | |
61f846a8 | 829 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
830 | |
831 | vprint(label, vp) | |
832 | char *label; | |
833 | register struct vnode *vp; | |
834 | { | |
f2f730c6 | 835 | char buf[64]; |
0bf84b18 KM |
836 | |
837 | if (label != NULL) | |
838 | printf("%s: ", label); | |
f2f730c6 | 839 | printf("type %s, usecount %d, refcount %d,", typename[vp->v_type], |
7f7b7d89 | 840 | vp->v_usecount, vp->v_holdcnt); |
f2f730c6 KM |
841 | buf[0] = '\0'; |
842 | if (vp->v_flag & VROOT) | |
843 | strcat(buf, "|VROOT"); | |
844 | if (vp->v_flag & VTEXT) | |
845 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
846 | if (vp->v_flag & VSYSTEM) |
847 | strcat(buf, "|VSYSTEM"); | |
f2f730c6 KM |
848 | if (vp->v_flag & VEXLOCK) |
849 | strcat(buf, "|VEXLOCK"); | |
850 | if (vp->v_flag & VSHLOCK) | |
851 | strcat(buf, "|VSHLOCK"); | |
852 | if (vp->v_flag & VLWAIT) | |
853 | strcat(buf, "|VLWAIT"); | |
36ef03ec KM |
854 | if (vp->v_flag & VXLOCK) |
855 | strcat(buf, "|VXLOCK"); | |
856 | if (vp->v_flag & VXWANT) | |
857 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
858 | if (vp->v_flag & VBWAIT) |
859 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
860 | if (vp->v_flag & VALIASED) |
861 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
862 | if (buf[0] != '\0') |
863 | printf(" flags (%s)", &buf[1]); | |
864 | printf("\n\t"); | |
0bf84b18 KM |
865 | VOP_PRINT(vp); |
866 | } | |
985cbdd5 MT |
867 | |
868 | int kinfo_vdebug = 1; | |
869 | int kinfo_vgetfailed; | |
870 | #define KINFO_VNODESLOP 10 | |
871 | /* | |
872 | * Dump vnode list (via kinfo). | |
873 | * Copyout address of vnode followed by vnode. | |
874 | */ | |
875 | kinfo_vnode(op, where, acopysize, arg, aneeded) | |
876 | char *where; | |
877 | int *acopysize, *aneeded; | |
878 | { | |
879 | register struct mount *mp = rootfs; | |
36ef03ec | 880 | struct mount *omp; |
985cbdd5 MT |
881 | struct vnode *vp; |
882 | register needed = 0; | |
883 | register char *bp = where, *savebp; | |
884 | char *ewhere = where + *acopysize; | |
885 | int error; | |
886 | ||
887 | #define VPTRSZ sizeof (struct vnode *) | |
888 | #define VNODESZ sizeof (struct vnode) | |
889 | if (where == NULL) { | |
890 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
891 | return (0); | |
892 | } | |
893 | ||
985cbdd5 | 894 | do { |
36ef03ec | 895 | if (vfs_busy(mp)) { |
54fb9dc2 | 896 | mp = mp->mnt_next; |
36ef03ec KM |
897 | continue; |
898 | } | |
985cbdd5 MT |
899 | savebp = bp; |
900 | again: | |
4597dd33 | 901 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
902 | /* |
903 | * Check that the vp is still associated with | |
904 | * this filesystem. RACE: could have been | |
905 | * recycled onto the same filesystem. | |
906 | */ | |
4597dd33 KM |
907 | if (vp->v_mount != mp) { |
908 | if (kinfo_vdebug) | |
909 | printf("kinfo: vp changed\n"); | |
910 | bp = savebp; | |
911 | goto again; | |
912 | } | |
985cbdd5 MT |
913 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
914 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
915 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 916 | VNODESZ)))) |
985cbdd5 | 917 | return (error); |
985cbdd5 | 918 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 919 | } |
36ef03ec | 920 | omp = mp; |
54fb9dc2 | 921 | mp = mp->mnt_next; |
36ef03ec | 922 | vfs_unbusy(omp); |
985cbdd5 MT |
923 | } while (mp != rootfs); |
924 | ||
925 | *aneeded = bp - where; | |
926 | if (bp > ewhere) | |
927 | *acopysize = ewhere - where; | |
928 | else | |
929 | *acopysize = bp - where; | |
930 | return (0); | |
931 | } |