Commit | Line | Data |
---|---|---|
3c4390e8 KM |
1 | /* |
2 | * Copyright (c) 1989 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
3c4390e8 | 6 | * |
dbf0c423 | 7 | * @(#)vfs_subr.c 7.47 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
14 | #include "param.h" | |
15 | #include "mount.h" | |
16 | #include "time.h" | |
17 | #include "vnode.h" | |
0f93ba7b | 18 | #include "specdev.h" |
c60798ca KM |
19 | #include "namei.h" |
20 | #include "ucred.h" | |
3c4390e8 | 21 | #include "errno.h" |
ef24f6dd | 22 | #include "malloc.h" |
3c4390e8 | 23 | |
3c4390e8 KM |
24 | /* |
25 | * Remove a mount point from the list of mounted filesystems. | |
26 | * Unmount of the root is illegal. | |
27 | */ | |
28 | void | |
29 | vfs_remove(mp) | |
30 | register struct mount *mp; | |
31 | { | |
32 | ||
33 | if (mp == rootfs) | |
34 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
35 | mp->mnt_prev->mnt_next = mp->mnt_next; |
36 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
37 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
38 | vfs_unlock(mp); |
39 | } | |
40 | ||
41 | /* | |
42 | * Lock a filesystem. | |
43 | * Used to prevent access to it while mounting and unmounting. | |
44 | */ | |
45 | vfs_lock(mp) | |
46 | register struct mount *mp; | |
47 | { | |
48 | ||
54fb9dc2 KM |
49 | while(mp->mnt_flag & MNT_MLOCK) { |
50 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
51 | sleep((caddr_t)mp, PVFS); |
52 | } | |
54fb9dc2 | 53 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
54 | return (0); |
55 | } | |
56 | ||
57 | /* | |
58 | * Unlock a locked filesystem. | |
59 | * Panic if filesystem is not locked. | |
60 | */ | |
61 | void | |
62 | vfs_unlock(mp) | |
63 | register struct mount *mp; | |
64 | { | |
65 | ||
54fb9dc2 | 66 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 67 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
68 | mp->mnt_flag &= ~MNT_MLOCK; |
69 | if (mp->mnt_flag & MNT_MWAIT) { | |
70 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
71 | wakeup((caddr_t)mp); |
72 | } | |
73 | } | |
74 | ||
36ef03ec KM |
75 | /* |
76 | * Mark a mount point as busy. | |
77 | * Used to synchronize access and to delay unmounting. | |
78 | */ | |
79 | vfs_busy(mp) | |
80 | register struct mount *mp; | |
81 | { | |
82 | ||
54fb9dc2 KM |
83 | while(mp->mnt_flag & MNT_MPBUSY) { |
84 | mp->mnt_flag |= MNT_MPWANT; | |
85 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 86 | } |
d8b63609 KM |
87 | if (mp->mnt_flag & MNT_UNMOUNT) |
88 | return (1); | |
54fb9dc2 | 89 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
90 | return (0); |
91 | } | |
92 | ||
93 | /* | |
94 | * Free a busy filesystem. | |
95 | * Panic if filesystem is not busy. | |
96 | */ | |
97 | void | |
98 | vfs_unbusy(mp) | |
99 | register struct mount *mp; | |
100 | { | |
101 | ||
54fb9dc2 | 102 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 103 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
104 | mp->mnt_flag &= ~MNT_MPBUSY; |
105 | if (mp->mnt_flag & MNT_MPWANT) { | |
106 | mp->mnt_flag &= ~MNT_MPWANT; | |
107 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
108 | } |
109 | } | |
110 | ||
3c4390e8 KM |
111 | /* |
112 | * Lookup a mount point by filesystem identifier. | |
113 | */ | |
114 | struct mount * | |
115 | getvfs(fsid) | |
116 | fsid_t *fsid; | |
117 | { | |
118 | register struct mount *mp; | |
119 | ||
d713f801 KM |
120 | mp = rootfs; |
121 | do { | |
54fb9dc2 KM |
122 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
123 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 124 | return (mp); |
3c4390e8 | 125 | } |
54fb9dc2 | 126 | mp = mp->mnt_next; |
d713f801 KM |
127 | } while (mp != rootfs); |
128 | return ((struct mount *)0); | |
3c4390e8 KM |
129 | } |
130 | ||
131 | /* | |
132 | * Set vnode attributes to VNOVAL | |
133 | */ | |
134 | void vattr_null(vap) | |
135 | register struct vattr *vap; | |
136 | { | |
137 | ||
138 | vap->va_type = VNON; | |
139 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = | |
140 | vap->va_fsid = vap->va_fileid = vap->va_size = | |
8fae943a KM |
141 | vap->va_size_rsv = vap->va_blocksize = vap->va_rdev = |
142 | vap->va_bytes = vap->va_bytes_rsv = | |
3c4390e8 KM |
143 | vap->va_atime.tv_sec = vap->va_atime.tv_usec = |
144 | vap->va_mtime.tv_sec = vap->va_mtime.tv_usec = | |
8cf4d4fb KM |
145 | vap->va_ctime.tv_sec = vap->va_ctime.tv_usec = |
146 | vap->va_flags = vap->va_gen = VNOVAL; | |
3c4390e8 | 147 | } |
c60798ca KM |
148 | |
149 | /* | |
150 | * Initialize a nameidata structure | |
151 | */ | |
152 | ndinit(ndp) | |
153 | register struct nameidata *ndp; | |
154 | { | |
155 | ||
156 | bzero((caddr_t)ndp, sizeof(struct nameidata)); | |
157 | ndp->ni_iov = &ndp->ni_nd.nd_iovec; | |
158 | ndp->ni_iovcnt = 1; | |
159 | ndp->ni_base = (caddr_t)&ndp->ni_dent; | |
160 | ndp->ni_rw = UIO_WRITE; | |
4dbe3531 | 161 | ndp->ni_uioseg = UIO_SYSSPACE; |
c60798ca KM |
162 | } |
163 | ||
164 | /* | |
165 | * Duplicate a nameidata structure | |
166 | */ | |
167 | nddup(ndp, newndp) | |
168 | register struct nameidata *ndp, *newndp; | |
169 | { | |
170 | ||
171 | ndinit(newndp); | |
172 | newndp->ni_cdir = ndp->ni_cdir; | |
8fe1c702 | 173 | VREF(newndp->ni_cdir); |
c60798ca KM |
174 | newndp->ni_rdir = ndp->ni_rdir; |
175 | if (newndp->ni_rdir) | |
8fe1c702 | 176 | VREF(newndp->ni_rdir); |
c60798ca KM |
177 | newndp->ni_cred = ndp->ni_cred; |
178 | crhold(newndp->ni_cred); | |
179 | } | |
180 | ||
181 | /* | |
182 | * Release a nameidata structure | |
183 | */ | |
184 | ndrele(ndp) | |
185 | register struct nameidata *ndp; | |
186 | { | |
187 | ||
188 | vrele(ndp->ni_cdir); | |
189 | if (ndp->ni_rdir) | |
190 | vrele(ndp->ni_rdir); | |
191 | crfree(ndp->ni_cred); | |
192 | } | |
36d09cb1 KM |
193 | |
194 | /* | |
195 | * Routines having to do with the management of the vnode table. | |
196 | */ | |
197 | struct vnode *vfreeh, **vfreet; | |
4ef5d036 | 198 | extern struct vnodeops dead_vnodeops, spec_vnodeops; |
32339c94 | 199 | extern void vclean(); |
1a80f56e | 200 | long numvnodes; |
d3664d8f | 201 | struct vattr va_null; |
c0de8792 | 202 | |
36d09cb1 | 203 | /* |
ef24f6dd | 204 | * Initialize the vnode structures and initialize each file system type. |
36d09cb1 | 205 | */ |
ef24f6dd | 206 | vfsinit() |
36d09cb1 | 207 | { |
ef24f6dd | 208 | struct vfsops **vfsp; |
36d09cb1 | 209 | |
ef24f6dd KM |
210 | /* |
211 | * Initialize the vnode name cache | |
212 | */ | |
213 | nchinit(); | |
214 | /* | |
215 | * Initialize each file system type. | |
216 | */ | |
d3664d8f | 217 | vattr_null(&va_null); |
ef24f6dd KM |
218 | for (vfsp = &vfssw[0]; vfsp <= &vfssw[MOUNT_MAXTYPE]; vfsp++) { |
219 | if (*vfsp == NULL) | |
220 | continue; | |
221 | (*(*vfsp)->vfs_init)(); | |
222 | } | |
36d09cb1 KM |
223 | } |
224 | ||
225 | /* | |
226 | * Return the next vnode from the free list. | |
227 | */ | |
228 | getnewvnode(tag, mp, vops, vpp) | |
229 | enum vtagtype tag; | |
230 | struct mount *mp; | |
231 | struct vnodeops *vops; | |
232 | struct vnode **vpp; | |
233 | { | |
234 | register struct vnode *vp, *vq; | |
235 | ||
1a80f56e KM |
236 | if (numvnodes < desiredvnodes) { |
237 | vp = (struct vnode *)malloc(sizeof *vp, M_VNODE, M_WAITOK); | |
238 | bzero((char *)vp, sizeof *vp); | |
239 | numvnodes++; | |
240 | } else { | |
241 | if ((vp = vfreeh) == NULL) { | |
242 | tablefull("vnode"); | |
243 | *vpp = 0; | |
244 | return (ENFILE); | |
245 | } | |
246 | if (vp->v_usecount) | |
247 | panic("free vnode isn't"); | |
248 | if (vq = vp->v_freef) | |
249 | vq->v_freeb = &vfreeh; | |
250 | else | |
251 | vfreet = &vfreeh; | |
252 | vfreeh = vq; | |
253 | vp->v_freef = NULL; | |
254 | vp->v_freeb = NULL; | |
255 | if (vp->v_type != VBAD) | |
256 | vgone(vp); | |
257 | vp->v_flag = 0; | |
258 | vp->v_shlockc = 0; | |
259 | vp->v_exlockc = 0; | |
260 | vp->v_lastr = 0; | |
261 | vp->v_socket = 0; | |
36d09cb1 | 262 | } |
b027498b | 263 | vp->v_type = VNON; |
36d09cb1 KM |
264 | cache_purge(vp); |
265 | vp->v_tag = tag; | |
ef24f6dd | 266 | vp->v_op = vops; |
36d09cb1 KM |
267 | insmntque(vp, mp); |
268 | VREF(vp); | |
269 | *vpp = vp; | |
270 | return (0); | |
271 | } | |
272 | ||
273 | /* | |
274 | * Move a vnode from one mount queue to another. | |
275 | */ | |
276 | insmntque(vp, mp) | |
277 | register struct vnode *vp; | |
278 | register struct mount *mp; | |
279 | { | |
280 | struct vnode *vq; | |
281 | ||
282 | /* | |
283 | * Delete from old mount point vnode list, if on one. | |
284 | */ | |
285 | if (vp->v_mountb) { | |
286 | if (vq = vp->v_mountf) | |
287 | vq->v_mountb = vp->v_mountb; | |
288 | *vp->v_mountb = vq; | |
289 | } | |
290 | /* | |
291 | * Insert into list of vnodes for the new mount point, if available. | |
292 | */ | |
a45ff315 | 293 | vp->v_mount = mp; |
36d09cb1 KM |
294 | if (mp == NULL) { |
295 | vp->v_mountf = NULL; | |
296 | vp->v_mountb = NULL; | |
297 | return; | |
298 | } | |
54fb9dc2 KM |
299 | if (mp->mnt_mounth) { |
300 | vp->v_mountf = mp->mnt_mounth; | |
301 | vp->v_mountb = &mp->mnt_mounth; | |
302 | mp->mnt_mounth->v_mountb = &vp->v_mountf; | |
303 | mp->mnt_mounth = vp; | |
36d09cb1 | 304 | } else { |
54fb9dc2 KM |
305 | mp->mnt_mounth = vp; |
306 | vp->v_mountb = &mp->mnt_mounth; | |
36d09cb1 KM |
307 | vp->v_mountf = NULL; |
308 | } | |
309 | } | |
310 | ||
311 | /* | |
ef24f6dd KM |
312 | * Create a vnode for a block device. |
313 | * Used for root filesystem, argdev, and swap areas. | |
314 | * Also used for memory file system special devices. | |
315 | */ | |
316 | bdevvp(dev, vpp) | |
317 | dev_t dev; | |
318 | struct vnode **vpp; | |
319 | { | |
ef24f6dd KM |
320 | register struct vnode *vp; |
321 | struct vnode *nvp; | |
322 | int error; | |
323 | ||
4ef5d036 | 324 | error = getnewvnode(VT_NON, (struct mount *)0, &spec_vnodeops, &nvp); |
ef24f6dd KM |
325 | if (error) { |
326 | *vpp = 0; | |
327 | return (error); | |
328 | } | |
329 | vp = nvp; | |
330 | vp->v_type = VBLK; | |
c0de8792 | 331 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
332 | vput(vp); |
333 | vp = nvp; | |
334 | } | |
335 | *vpp = vp; | |
336 | return (0); | |
337 | } | |
338 | ||
339 | /* | |
340 | * Check to see if the new vnode represents a special device | |
341 | * for which we already have a vnode (either because of | |
342 | * bdevvp() or because of a different vnode representing | |
343 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 344 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
345 | * caller is responsible for filling it with its new contents. |
346 | */ | |
347 | struct vnode * | |
c0de8792 | 348 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 349 | register struct vnode *nvp; |
c0de8792 | 350 | dev_t nvp_rdev; |
ef24f6dd KM |
351 | struct mount *mp; |
352 | { | |
353 | register struct vnode *vp; | |
c0de8792 | 354 | struct vnode **vpp; |
ef24f6dd KM |
355 | |
356 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 357 | return (NULLVP); |
c0de8792 KM |
358 | |
359 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 360 | loop: |
c0de8792 KM |
361 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
362 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 363 | continue; |
c0de8792 KM |
364 | /* |
365 | * Alias, but not in use, so flush it out. | |
366 | */ | |
7f7b7d89 | 367 | if (vp->v_usecount == 0) { |
c0de8792 KM |
368 | vgone(vp); |
369 | goto loop; | |
370 | } | |
ef62830d KM |
371 | if (vget(vp)) |
372 | goto loop; | |
ef24f6dd KM |
373 | break; |
374 | } | |
c0de8792 | 375 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
376 | MALLOC(nvp->v_specinfo, struct specinfo *, |
377 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
378 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 379 | nvp->v_hashchain = vpp; |
c0de8792 | 380 | nvp->v_specnext = *vpp; |
2c957a90 | 381 | nvp->v_specflags = 0; |
c0de8792 | 382 | *vpp = nvp; |
40452d5e KM |
383 | if (vp != NULL) { |
384 | nvp->v_flag |= VALIASED; | |
385 | vp->v_flag |= VALIASED; | |
386 | vput(vp); | |
387 | } | |
54fb9dc2 | 388 | return (NULLVP); |
ef24f6dd | 389 | } |
2bae1875 KM |
390 | VOP_UNLOCK(vp); |
391 | vclean(vp, 0); | |
ef24f6dd KM |
392 | vp->v_op = nvp->v_op; |
393 | vp->v_tag = nvp->v_tag; | |
394 | nvp->v_type = VNON; | |
395 | insmntque(vp, mp); | |
396 | return (vp); | |
397 | } | |
398 | ||
399 | /* | |
400 | * Grab a particular vnode from the free list, increment its | |
401 | * reference count and lock it. The vnode lock bit is set the | |
402 | * vnode is being eliminated in vgone. The process is awakened | |
403 | * when the transition is completed, and an error returned to | |
404 | * indicate that the vnode is no longer usable (possibly having | |
405 | * been changed to a new file system type). | |
36d09cb1 KM |
406 | */ |
407 | vget(vp) | |
408 | register struct vnode *vp; | |
409 | { | |
410 | register struct vnode *vq; | |
411 | ||
ef24f6dd KM |
412 | if (vp->v_flag & VXLOCK) { |
413 | vp->v_flag |= VXWANT; | |
414 | sleep((caddr_t)vp, PINOD); | |
415 | return (1); | |
416 | } | |
7f7b7d89 | 417 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
418 | if (vq = vp->v_freef) |
419 | vq->v_freeb = vp->v_freeb; | |
420 | else | |
421 | vfreet = vp->v_freeb; | |
422 | *vp->v_freeb = vq; | |
423 | vp->v_freef = NULL; | |
424 | vp->v_freeb = NULL; | |
425 | } | |
36d09cb1 | 426 | VREF(vp); |
ef24f6dd KM |
427 | VOP_LOCK(vp); |
428 | return (0); | |
36d09cb1 KM |
429 | } |
430 | ||
431 | /* | |
432 | * Vnode reference, just increment the count | |
433 | */ | |
434 | void vref(vp) | |
435 | struct vnode *vp; | |
436 | { | |
437 | ||
7f7b7d89 | 438 | vp->v_usecount++; |
36d09cb1 KM |
439 | } |
440 | ||
441 | /* | |
442 | * vput(), just unlock and vrele() | |
443 | */ | |
444 | void vput(vp) | |
445 | register struct vnode *vp; | |
446 | { | |
447 | VOP_UNLOCK(vp); | |
448 | vrele(vp); | |
449 | } | |
450 | ||
451 | /* | |
452 | * Vnode release. | |
453 | * If count drops to zero, call inactive routine and return to freelist. | |
454 | */ | |
455 | void vrele(vp) | |
456 | register struct vnode *vp; | |
457 | { | |
458 | ||
459 | if (vp == NULL) | |
ef24f6dd | 460 | panic("vrele: null vp"); |
7f7b7d89 KM |
461 | vp->v_usecount--; |
462 | if (vp->v_usecount < 0) | |
0bf84b18 | 463 | vprint("vrele: bad ref count", vp); |
7f7b7d89 | 464 | if (vp->v_usecount > 0) |
36d09cb1 | 465 | return; |
54fb9dc2 | 466 | if (vfreeh == NULLVP) { |
36d09cb1 KM |
467 | /* |
468 | * insert into empty list | |
469 | */ | |
470 | vfreeh = vp; | |
471 | vp->v_freeb = &vfreeh; | |
36d09cb1 KM |
472 | } else { |
473 | /* | |
474 | * insert at tail of list | |
475 | */ | |
476 | *vfreet = vp; | |
477 | vp->v_freeb = vfreet; | |
36d09cb1 | 478 | } |
ef24f6dd KM |
479 | vp->v_freef = NULL; |
480 | vfreet = &vp->v_freef; | |
481 | VOP_INACTIVE(vp); | |
482 | } | |
483 | ||
7f7b7d89 KM |
484 | /* |
485 | * Page or buffer structure gets a reference. | |
486 | */ | |
487 | vhold(vp) | |
488 | register struct vnode *vp; | |
489 | { | |
490 | ||
491 | vp->v_holdcnt++; | |
492 | } | |
493 | ||
494 | /* | |
495 | * Page or buffer structure frees a reference. | |
496 | */ | |
497 | holdrele(vp) | |
498 | register struct vnode *vp; | |
499 | { | |
500 | ||
501 | if (vp->v_holdcnt <= 0) | |
502 | panic("holdrele: holdcnt"); | |
503 | vp->v_holdcnt--; | |
504 | } | |
505 | ||
f0556f86 KM |
506 | /* |
507 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
508 | * | |
509 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
510 | * return error if any are found (nb: this is a user error, not a | |
511 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
512 | * that are found. | |
513 | */ | |
514 | int busyprt = 0; /* patch to print out busy vnodes */ | |
515 | ||
516 | vflush(mp, skipvp, flags) | |
517 | struct mount *mp; | |
518 | struct vnode *skipvp; | |
519 | int flags; | |
520 | { | |
521 | register struct vnode *vp, *nvp; | |
522 | int busy = 0; | |
523 | ||
54fb9dc2 | 524 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 525 | panic("vflush: not busy"); |
4597dd33 | 526 | loop: |
54fb9dc2 | 527 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
528 | if (vp->v_mount != mp) |
529 | goto loop; | |
f0556f86 KM |
530 | nvp = vp->v_mountf; |
531 | /* | |
532 | * Skip over a selected vnode. | |
f0556f86 KM |
533 | */ |
534 | if (vp == skipvp) | |
535 | continue; | |
36ef03ec KM |
536 | /* |
537 | * Skip over a vnodes marked VSYSTEM. | |
538 | */ | |
539 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
540 | continue; | |
f0556f86 | 541 | /* |
7f7b7d89 | 542 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
543 | * out the vnode data structures and we are done. |
544 | */ | |
7f7b7d89 | 545 | if (vp->v_usecount == 0) { |
f0556f86 KM |
546 | vgone(vp); |
547 | continue; | |
548 | } | |
549 | /* | |
550 | * For block or character devices, revert to an | |
551 | * anonymous device. For all other files, just kill them. | |
552 | */ | |
36ef03ec | 553 | if (flags & FORCECLOSE) { |
f0556f86 KM |
554 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
555 | vgone(vp); | |
556 | } else { | |
557 | vclean(vp, 0); | |
558 | vp->v_op = &spec_vnodeops; | |
559 | insmntque(vp, (struct mount *)0); | |
560 | } | |
561 | continue; | |
562 | } | |
563 | if (busyprt) | |
0bf84b18 | 564 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
565 | busy++; |
566 | } | |
567 | if (busy) | |
568 | return (EBUSY); | |
569 | return (0); | |
570 | } | |
571 | ||
ef24f6dd KM |
572 | /* |
573 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 574 | */ |
36ef03ec | 575 | void vclean(vp, flags) |
ef24f6dd | 576 | register struct vnode *vp; |
36ef03ec | 577 | long flags; |
ef24f6dd KM |
578 | { |
579 | struct vnodeops *origops; | |
2bae1875 | 580 | int active; |
ef24f6dd | 581 | |
2bae1875 KM |
582 | /* |
583 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
584 | * If so we have to reference it before we clean it out |
585 | * so that its count cannot fall to zero and generate a | |
586 | * race against ourselves to recycle it. | |
2bae1875 | 587 | */ |
7f7b7d89 | 588 | if (active = vp->v_usecount) |
2bae1875 | 589 | VREF(vp); |
2bae1875 KM |
590 | /* |
591 | * Prevent the vnode from being recycled or | |
592 | * brought into use while we clean it out. | |
593 | */ | |
0bf84b18 KM |
594 | if (vp->v_flag & VXLOCK) |
595 | panic("vclean: deadlock"); | |
ef24f6dd | 596 | vp->v_flag |= VXLOCK; |
0bf84b18 KM |
597 | /* |
598 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
599 | * have the object locked while it cleans it out. The VOP_LOCK | |
600 | * ensures that the VOP_INACTIVE routine is done with its work. | |
601 | * For active vnodes, it ensures that no other activity can | |
602 | * occur while the buffer list is being cleaned out. | |
603 | */ | |
604 | VOP_LOCK(vp); | |
36ef03ec | 605 | if (flags & DOCLOSE) |
0bf84b18 | 606 | vinvalbuf(vp, 1); |
ef24f6dd KM |
607 | /* |
608 | * Prevent any further operations on the vnode from | |
609 | * being passed through to the old file system. | |
610 | */ | |
611 | origops = vp->v_op; | |
612 | vp->v_op = &dead_vnodeops; | |
613 | vp->v_tag = VT_NON; | |
614 | /* | |
2bae1875 KM |
615 | * If purging an active vnode, it must be unlocked, closed, |
616 | * and deactivated before being reclaimed. | |
ef24f6dd | 617 | */ |
0bf84b18 | 618 | (*(origops->vn_unlock))(vp); |
2bae1875 | 619 | if (active) { |
36ef03ec | 620 | if (flags & DOCLOSE) |
2bae1875 | 621 | (*(origops->vn_close))(vp, 0, NOCRED); |
ef24f6dd KM |
622 | (*(origops->vn_inactive))(vp); |
623 | } | |
624 | /* | |
625 | * Reclaim the vnode. | |
626 | */ | |
627 | if ((*(origops->vn_reclaim))(vp)) | |
628 | panic("vclean: cannot reclaim"); | |
2bae1875 KM |
629 | if (active) |
630 | vrele(vp); | |
ef24f6dd KM |
631 | /* |
632 | * Done with purge, notify sleepers in vget of the grim news. | |
633 | */ | |
634 | vp->v_flag &= ~VXLOCK; | |
635 | if (vp->v_flag & VXWANT) { | |
636 | vp->v_flag &= ~VXWANT; | |
637 | wakeup((caddr_t)vp); | |
638 | } | |
639 | } | |
640 | ||
ef62830d KM |
641 | /* |
642 | * Eliminate all activity associated with the requested vnode | |
643 | * and with all vnodes aliased to the requested vnode. | |
644 | */ | |
645 | void vgoneall(vp) | |
646 | register struct vnode *vp; | |
647 | { | |
7f7b7d89 | 648 | register struct vnode *vq; |
ef62830d | 649 | |
7a7b3a95 KM |
650 | if (vp->v_flag & VALIASED) { |
651 | /* | |
652 | * If a vgone (or vclean) is already in progress, | |
653 | * wait until it is done and return. | |
654 | */ | |
655 | if (vp->v_flag & VXLOCK) { | |
656 | vp->v_flag |= VXWANT; | |
657 | sleep((caddr_t)vp, PINOD); | |
658 | return; | |
659 | } | |
660 | /* | |
661 | * Ensure that vp will not be vgone'd while we | |
662 | * are eliminating its aliases. | |
663 | */ | |
664 | vp->v_flag |= VXLOCK; | |
665 | while (vp->v_flag & VALIASED) { | |
666 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
667 | if (vq->v_rdev != vp->v_rdev || | |
668 | vq->v_type != vp->v_type || vp == vq) | |
669 | continue; | |
670 | vgone(vq); | |
671 | break; | |
672 | } | |
ef62830d | 673 | } |
7a7b3a95 KM |
674 | /* |
675 | * Remove the lock so that vgone below will | |
676 | * really eliminate the vnode after which time | |
677 | * vgone will awaken any sleepers. | |
678 | */ | |
679 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
680 | } |
681 | vgone(vp); | |
682 | } | |
683 | ||
ef24f6dd KM |
684 | /* |
685 | * Eliminate all activity associated with a vnode | |
686 | * in preparation for reuse. | |
687 | */ | |
688 | void vgone(vp) | |
689 | register struct vnode *vp; | |
690 | { | |
7f7b7d89 | 691 | register struct vnode *vq; |
c0de8792 KM |
692 | struct vnode *vx; |
693 | long count; | |
ef24f6dd | 694 | |
4f55e3ec KM |
695 | /* |
696 | * If a vgone (or vclean) is already in progress, | |
697 | * wait until it is done and return. | |
698 | */ | |
699 | if (vp->v_flag & VXLOCK) { | |
700 | vp->v_flag |= VXWANT; | |
701 | sleep((caddr_t)vp, PINOD); | |
702 | return; | |
703 | } | |
ef24f6dd KM |
704 | /* |
705 | * Clean out the filesystem specific data. | |
706 | */ | |
36ef03ec | 707 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
708 | /* |
709 | * Delete from old mount point vnode list, if on one. | |
710 | */ | |
711 | if (vp->v_mountb) { | |
712 | if (vq = vp->v_mountf) | |
713 | vq->v_mountb = vp->v_mountb; | |
714 | *vp->v_mountb = vq; | |
715 | vp->v_mountf = NULL; | |
716 | vp->v_mountb = NULL; | |
717 | } | |
718 | /* | |
719 | * If special device, remove it from special device alias list. | |
720 | */ | |
721 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
722 | if (*vp->v_hashchain == vp) { |
723 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 724 | } else { |
7f7b7d89 | 725 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 726 | if (vq->v_specnext != vp) |
ef24f6dd | 727 | continue; |
c0de8792 | 728 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
729 | break; |
730 | } | |
c0de8792 | 731 | if (vq == NULL) |
ef24f6dd KM |
732 | panic("missing bdev"); |
733 | } | |
c0de8792 | 734 | if (vp->v_flag & VALIASED) { |
7f7b7d89 KM |
735 | count = 0; |
736 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
de81e10c KM |
737 | if (vq->v_rdev != vp->v_rdev || |
738 | vq->v_type != vp->v_type) | |
c0de8792 KM |
739 | continue; |
740 | count++; | |
741 | vx = vq; | |
742 | } | |
743 | if (count == 0) | |
744 | panic("missing alias"); | |
745 | if (count == 1) | |
746 | vx->v_flag &= ~VALIASED; | |
747 | vp->v_flag &= ~VALIASED; | |
748 | } | |
749 | FREE(vp->v_specinfo, M_VNODE); | |
750 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
751 | } |
752 | /* | |
753 | * If it is on the freelist, move it to the head of the list. | |
754 | */ | |
755 | if (vp->v_freeb) { | |
756 | if (vq = vp->v_freef) | |
757 | vq->v_freeb = vp->v_freeb; | |
758 | else | |
759 | vfreet = vp->v_freeb; | |
760 | *vp->v_freeb = vq; | |
761 | vp->v_freef = vfreeh; | |
762 | vp->v_freeb = &vfreeh; | |
763 | vfreeh->v_freeb = &vp->v_freef; | |
764 | vfreeh = vp; | |
765 | } | |
2bae1875 | 766 | vp->v_type = VBAD; |
36d09cb1 | 767 | } |
ef62830d | 768 | |
2bcd6066 KM |
769 | /* |
770 | * Lookup a vnode by device number. | |
771 | */ | |
772 | vfinddev(dev, type, vpp) | |
773 | dev_t dev; | |
774 | enum vtype type; | |
775 | struct vnode **vpp; | |
776 | { | |
777 | register struct vnode *vp; | |
778 | ||
779 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
780 | if (dev != vp->v_rdev || type != vp->v_type) | |
781 | continue; | |
782 | *vpp = vp; | |
783 | return (0); | |
784 | } | |
785 | return (1); | |
786 | } | |
787 | ||
ef62830d KM |
788 | /* |
789 | * Calculate the total number of references to a special device. | |
790 | */ | |
791 | vcount(vp) | |
792 | register struct vnode *vp; | |
793 | { | |
7f7b7d89 | 794 | register struct vnode *vq; |
ef62830d KM |
795 | int count; |
796 | ||
797 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 798 | return (vp->v_usecount); |
ef62830d | 799 | loop: |
7f7b7d89 | 800 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 801 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
802 | continue; |
803 | /* | |
804 | * Alias, but not in use, so flush it out. | |
805 | */ | |
7f7b7d89 | 806 | if (vq->v_usecount == 0) { |
ef62830d KM |
807 | vgone(vq); |
808 | goto loop; | |
809 | } | |
7f7b7d89 | 810 | count += vq->v_usecount; |
ef62830d KM |
811 | } |
812 | return (count); | |
813 | } | |
0bf84b18 KM |
814 | |
815 | /* | |
816 | * Print out a description of a vnode. | |
817 | */ | |
818 | static char *typename[] = | |
61f846a8 | 819 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
820 | |
821 | vprint(label, vp) | |
822 | char *label; | |
823 | register struct vnode *vp; | |
824 | { | |
f2f730c6 | 825 | char buf[64]; |
0bf84b18 KM |
826 | |
827 | if (label != NULL) | |
828 | printf("%s: ", label); | |
f2f730c6 | 829 | printf("type %s, usecount %d, refcount %d,", typename[vp->v_type], |
7f7b7d89 | 830 | vp->v_usecount, vp->v_holdcnt); |
f2f730c6 KM |
831 | buf[0] = '\0'; |
832 | if (vp->v_flag & VROOT) | |
833 | strcat(buf, "|VROOT"); | |
834 | if (vp->v_flag & VTEXT) | |
835 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
836 | if (vp->v_flag & VSYSTEM) |
837 | strcat(buf, "|VSYSTEM"); | |
f2f730c6 KM |
838 | if (vp->v_flag & VEXLOCK) |
839 | strcat(buf, "|VEXLOCK"); | |
840 | if (vp->v_flag & VSHLOCK) | |
841 | strcat(buf, "|VSHLOCK"); | |
842 | if (vp->v_flag & VLWAIT) | |
843 | strcat(buf, "|VLWAIT"); | |
36ef03ec KM |
844 | if (vp->v_flag & VXLOCK) |
845 | strcat(buf, "|VXLOCK"); | |
846 | if (vp->v_flag & VXWANT) | |
847 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
848 | if (vp->v_flag & VBWAIT) |
849 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
850 | if (vp->v_flag & VALIASED) |
851 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
852 | if (buf[0] != '\0') |
853 | printf(" flags (%s)", &buf[1]); | |
854 | printf("\n\t"); | |
0bf84b18 KM |
855 | VOP_PRINT(vp); |
856 | } | |
985cbdd5 MT |
857 | |
858 | int kinfo_vdebug = 1; | |
859 | int kinfo_vgetfailed; | |
860 | #define KINFO_VNODESLOP 10 | |
861 | /* | |
862 | * Dump vnode list (via kinfo). | |
863 | * Copyout address of vnode followed by vnode. | |
864 | */ | |
865 | kinfo_vnode(op, where, acopysize, arg, aneeded) | |
866 | char *where; | |
867 | int *acopysize, *aneeded; | |
868 | { | |
869 | register struct mount *mp = rootfs; | |
36ef03ec | 870 | struct mount *omp; |
985cbdd5 MT |
871 | struct vnode *vp; |
872 | register needed = 0; | |
873 | register char *bp = where, *savebp; | |
874 | char *ewhere = where + *acopysize; | |
875 | int error; | |
876 | ||
877 | #define VPTRSZ sizeof (struct vnode *) | |
878 | #define VNODESZ sizeof (struct vnode) | |
879 | if (where == NULL) { | |
880 | *aneeded = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); | |
881 | return (0); | |
882 | } | |
883 | ||
985cbdd5 | 884 | do { |
36ef03ec | 885 | if (vfs_busy(mp)) { |
54fb9dc2 | 886 | mp = mp->mnt_next; |
36ef03ec KM |
887 | continue; |
888 | } | |
985cbdd5 MT |
889 | savebp = bp; |
890 | again: | |
4597dd33 | 891 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
892 | /* |
893 | * Check that the vp is still associated with | |
894 | * this filesystem. RACE: could have been | |
895 | * recycled onto the same filesystem. | |
896 | */ | |
4597dd33 KM |
897 | if (vp->v_mount != mp) { |
898 | if (kinfo_vdebug) | |
899 | printf("kinfo: vp changed\n"); | |
900 | bp = savebp; | |
901 | goto again; | |
902 | } | |
985cbdd5 MT |
903 | if ((bp + VPTRSZ + VNODESZ <= ewhere) && |
904 | ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
905 | (error = copyout((caddr_t)vp, bp + VPTRSZ, | |
41185b3b | 906 | VNODESZ)))) |
985cbdd5 | 907 | return (error); |
985cbdd5 | 908 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 909 | } |
36ef03ec | 910 | omp = mp; |
54fb9dc2 | 911 | mp = mp->mnt_next; |
36ef03ec | 912 | vfs_unbusy(omp); |
985cbdd5 MT |
913 | } while (mp != rootfs); |
914 | ||
915 | *aneeded = bp - where; | |
916 | if (bp > ewhere) | |
917 | *acopysize = ewhere - where; | |
918 | else | |
919 | *acopysize = bp - where; | |
920 | return (0); | |
921 | } |