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 | * | |
dbf0c423 | 5 | * %sccs.include.redist.c% |
3c4390e8 | 6 | * |
786fb484 | 7 | * @(#)vfs_subr.c 7.94 (Berkeley) %G% |
3c4390e8 KM |
8 | */ |
9 | ||
10 | /* | |
11 | * External virtual filesystem routines | |
12 | */ | |
13 | ||
cb796a23 | 14 | #include <sys/param.h> |
917dc539 | 15 | #include <sys/systm.h> |
cb796a23 KB |
16 | #include <sys/proc.h> |
17 | #include <sys/mount.h> | |
18 | #include <sys/time.h> | |
19 | #include <sys/vnode.h> | |
807cc430 | 20 | #include <sys/stat.h> |
cb796a23 KB |
21 | #include <sys/namei.h> |
22 | #include <sys/ucred.h> | |
23 | #include <sys/buf.h> | |
24 | #include <sys/errno.h> | |
25 | #include <sys/malloc.h> | |
3c4390e8 | 26 | |
021de758 JSP |
27 | #include <miscfs/specfs/specdev.h> |
28 | ||
807cc430 KM |
29 | enum vtype iftovt_tab[16] = { |
30 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
31 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
32 | }; | |
33 | int vttoif_tab[9] = { | |
34 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
35 | S_IFSOCK, S_IFIFO, S_IFMT, | |
36 | }; | |
37 | ||
e3249ec0 KM |
38 | /* |
39 | * Insq/Remq for the vnode usage lists. | |
40 | */ | |
41 | #define bufinsvn(bp, dp) list_enter_head(dp, bp, struct buf *, b_vnbufs) | |
42 | #define bufremvn(bp) list_remove(bp, struct buf *, b_vnbufs) | |
43 | ||
3c4390e8 KM |
44 | /* |
45 | * Remove a mount point from the list of mounted filesystems. | |
46 | * Unmount of the root is illegal. | |
47 | */ | |
48 | void | |
49 | vfs_remove(mp) | |
50 | register struct mount *mp; | |
51 | { | |
52 | ||
53 | if (mp == rootfs) | |
54 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
55 | mp->mnt_prev->mnt_next = mp->mnt_next; |
56 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
57 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
58 | vfs_unlock(mp); |
59 | } | |
60 | ||
61 | /* | |
62 | * Lock a filesystem. | |
63 | * Used to prevent access to it while mounting and unmounting. | |
64 | */ | |
65 | vfs_lock(mp) | |
66 | register struct mount *mp; | |
67 | { | |
68 | ||
54fb9dc2 KM |
69 | while(mp->mnt_flag & MNT_MLOCK) { |
70 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
71 | sleep((caddr_t)mp, PVFS); |
72 | } | |
54fb9dc2 | 73 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
74 | return (0); |
75 | } | |
76 | ||
77 | /* | |
78 | * Unlock a locked filesystem. | |
79 | * Panic if filesystem is not locked. | |
80 | */ | |
81 | void | |
82 | vfs_unlock(mp) | |
83 | register struct mount *mp; | |
84 | { | |
85 | ||
54fb9dc2 | 86 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 87 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
88 | mp->mnt_flag &= ~MNT_MLOCK; |
89 | if (mp->mnt_flag & MNT_MWAIT) { | |
90 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
91 | wakeup((caddr_t)mp); |
92 | } | |
93 | } | |
94 | ||
36ef03ec KM |
95 | /* |
96 | * Mark a mount point as busy. | |
97 | * Used to synchronize access and to delay unmounting. | |
98 | */ | |
99 | vfs_busy(mp) | |
100 | register struct mount *mp; | |
101 | { | |
102 | ||
54fb9dc2 KM |
103 | while(mp->mnt_flag & MNT_MPBUSY) { |
104 | mp->mnt_flag |= MNT_MPWANT; | |
105 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 106 | } |
d8b63609 KM |
107 | if (mp->mnt_flag & MNT_UNMOUNT) |
108 | return (1); | |
54fb9dc2 | 109 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
110 | return (0); |
111 | } | |
112 | ||
113 | /* | |
114 | * Free a busy filesystem. | |
115 | * Panic if filesystem is not busy. | |
116 | */ | |
36ef03ec KM |
117 | vfs_unbusy(mp) |
118 | register struct mount *mp; | |
119 | { | |
120 | ||
54fb9dc2 | 121 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 122 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
123 | mp->mnt_flag &= ~MNT_MPBUSY; |
124 | if (mp->mnt_flag & MNT_MPWANT) { | |
125 | mp->mnt_flag &= ~MNT_MPWANT; | |
126 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
127 | } |
128 | } | |
129 | ||
3c4390e8 KM |
130 | /* |
131 | * Lookup a mount point by filesystem identifier. | |
132 | */ | |
133 | struct mount * | |
134 | getvfs(fsid) | |
135 | fsid_t *fsid; | |
136 | { | |
137 | register struct mount *mp; | |
138 | ||
d713f801 KM |
139 | mp = rootfs; |
140 | do { | |
54fb9dc2 KM |
141 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
142 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 143 | return (mp); |
3c4390e8 | 144 | } |
54fb9dc2 | 145 | mp = mp->mnt_next; |
d713f801 KM |
146 | } while (mp != rootfs); |
147 | return ((struct mount *)0); | |
3c4390e8 KM |
148 | } |
149 | ||
917dc539 JSP |
150 | /* |
151 | * Get a new unique fsid | |
152 | */ | |
153 | void | |
154 | getnewfsid(mp, mtype) | |
155 | struct mount *mp; | |
156 | int mtype; | |
157 | { | |
158 | static u_short xxxfs_mntid; | |
159 | ||
160 | fsid_t tfsid; | |
161 | ||
162 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */ | |
163 | mp->mnt_stat.f_fsid.val[1] = mtype; | |
164 | if (xxxfs_mntid == 0) | |
165 | ++xxxfs_mntid; | |
166 | tfsid.val[0] = makedev(nblkdev, xxxfs_mntid); | |
167 | tfsid.val[1] = mtype; | |
17fd1cc7 JSP |
168 | if (rootfs) { |
169 | while (getvfs(&tfsid)) { | |
170 | tfsid.val[0]++; | |
171 | xxxfs_mntid++; | |
172 | } | |
917dc539 JSP |
173 | } |
174 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
175 | } | |
176 | ||
3c4390e8 KM |
177 | /* |
178 | * Set vnode attributes to VNOVAL | |
179 | */ | |
180 | void vattr_null(vap) | |
181 | register struct vattr *vap; | |
182 | { | |
183 | ||
184 | vap->va_type = VNON; | |
83504fd5 | 185 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 186 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
187 | vap->va_fsid = vap->va_fileid = |
188 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
189 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
190 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
191 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 192 | vap->va_flags = vap->va_gen = VNOVAL; |
3c4390e8 | 193 | } |
c60798ca | 194 | |
36d09cb1 KM |
195 | /* |
196 | * Routines having to do with the management of the vnode table. | |
197 | */ | |
dc998e72 | 198 | struct vnode *vfreeh, **vfreet = &vfreeh; |
9342689a | 199 | extern int (**dead_vnodeop_p)(); |
32339c94 | 200 | extern void vclean(); |
1a80f56e | 201 | long numvnodes; |
e781da98 | 202 | extern struct vattr va_null; |
36d09cb1 | 203 | |
1f9d2249 | 204 | |
36d09cb1 KM |
205 | /* |
206 | * Return the next vnode from the free list. | |
207 | */ | |
208 | getnewvnode(tag, mp, vops, vpp) | |
209 | enum vtagtype tag; | |
210 | struct mount *mp; | |
cf74dd57 | 211 | int (**vops)(); |
36d09cb1 KM |
212 | struct vnode **vpp; |
213 | { | |
214 | register struct vnode *vp, *vq; | |
1f9d2249 | 215 | int s; |
36d09cb1 | 216 | |
ecf75a7d KM |
217 | if ((vfreeh == NULL && numvnodes < 2 * desiredvnodes) || |
218 | numvnodes < desiredvnodes) { | |
aacc1bff KM |
219 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
220 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
221 | bzero((char *)vp, sizeof *vp); |
222 | numvnodes++; | |
223 | } else { | |
224 | if ((vp = vfreeh) == NULL) { | |
225 | tablefull("vnode"); | |
226 | *vpp = 0; | |
227 | return (ENFILE); | |
228 | } | |
229 | if (vp->v_usecount) | |
230 | panic("free vnode isn't"); | |
231 | if (vq = vp->v_freef) | |
232 | vq->v_freeb = &vfreeh; | |
233 | else | |
234 | vfreet = &vfreeh; | |
235 | vfreeh = vq; | |
236 | vp->v_freef = NULL; | |
237 | vp->v_freeb = NULL; | |
39b99eb6 | 238 | vp->v_lease = NULL; |
1a80f56e KM |
239 | if (vp->v_type != VBAD) |
240 | vgone(vp); | |
1f9d2249 | 241 | #ifdef DIAGNOSTIC |
2345b093 KM |
242 | if (vp->v_data) |
243 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
244 | s = splbio(); |
245 | if (vp->v_numoutput) | |
246 | panic("Clean vnode has pending I/O's"); | |
247 | splx(s); | |
248 | #endif | |
1a80f56e | 249 | vp->v_flag = 0; |
1a80f56e | 250 | vp->v_lastr = 0; |
1f9d2249 MS |
251 | vp->v_lastw = 0; |
252 | vp->v_lasta = 0; | |
253 | vp->v_cstart = 0; | |
254 | vp->v_clen = 0; | |
1a80f56e | 255 | vp->v_socket = 0; |
36d09cb1 | 256 | } |
1f9d2249 | 257 | vp->v_ralen = 1; |
b027498b | 258 | vp->v_type = VNON; |
36d09cb1 KM |
259 | cache_purge(vp); |
260 | vp->v_tag = tag; | |
ef24f6dd | 261 | vp->v_op = vops; |
36d09cb1 KM |
262 | insmntque(vp, mp); |
263 | VREF(vp); | |
264 | *vpp = vp; | |
265 | return (0); | |
266 | } | |
36d09cb1 KM |
267 | /* |
268 | * Move a vnode from one mount queue to another. | |
269 | */ | |
270 | insmntque(vp, mp) | |
271 | register struct vnode *vp; | |
272 | register struct mount *mp; | |
273 | { | |
8136adfc | 274 | register struct vnode *vq; |
36d09cb1 KM |
275 | |
276 | /* | |
277 | * Delete from old mount point vnode list, if on one. | |
278 | */ | |
279 | if (vp->v_mountb) { | |
280 | if (vq = vp->v_mountf) | |
281 | vq->v_mountb = vp->v_mountb; | |
282 | *vp->v_mountb = vq; | |
283 | } | |
284 | /* | |
285 | * Insert into list of vnodes for the new mount point, if available. | |
286 | */ | |
a45ff315 | 287 | vp->v_mount = mp; |
36d09cb1 KM |
288 | if (mp == NULL) { |
289 | vp->v_mountf = NULL; | |
290 | vp->v_mountb = NULL; | |
291 | return; | |
292 | } | |
8136adfc KM |
293 | if (vq = mp->mnt_mounth) |
294 | vq->v_mountb = &vp->v_mountf; | |
295 | vp->v_mountf = vq; | |
296 | vp->v_mountb = &mp->mnt_mounth; | |
297 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
298 | } |
299 | ||
76429560 KM |
300 | /* |
301 | * Update outstanding I/O count and do wakeup if requested. | |
302 | */ | |
303 | vwakeup(bp) | |
304 | register struct buf *bp; | |
305 | { | |
306 | register struct vnode *vp; | |
307 | ||
a9338fad | 308 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
309 | if (vp = bp->b_vp) { |
310 | vp->v_numoutput--; | |
1f9d2249 MS |
311 | if (vp->v_numoutput < 0) |
312 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
313 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
314 | if (vp->v_numoutput < 0) | |
315 | panic("vwakeup: neg numoutput"); | |
316 | vp->v_flag &= ~VBWAIT; | |
317 | wakeup((caddr_t)&vp->v_numoutput); | |
318 | } | |
319 | } | |
320 | } | |
321 | ||
76429560 KM |
322 | /* |
323 | * Flush out and invalidate all buffers associated with a vnode. | |
324 | * Called with the underlying object locked. | |
325 | */ | |
d024c2ce | 326 | int |
c33e9e8b | 327 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 328 | register struct vnode *vp; |
12079a9d | 329 | int flags; |
d024c2ce KM |
330 | struct ucred *cred; |
331 | struct proc *p; | |
c33e9e8b | 332 | int slpflag, slptimeo; |
76429560 KM |
333 | { |
334 | register struct buf *bp; | |
335 | struct buf *nbp, *blist; | |
d024c2ce | 336 | int s, error; |
76429560 | 337 | |
12079a9d | 338 | if (flags & V_SAVE) { |
d024c2ce KM |
339 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
340 | return (error); | |
e3249ec0 | 341 | if (vp->v_dirtyblkhd.le_next != NULL) |
d024c2ce KM |
342 | panic("vinvalbuf: dirty bufs"); |
343 | } | |
76429560 | 344 | for (;;) { |
e3249ec0 | 345 | if ((blist = vp->v_cleanblkhd.le_next) && flags & V_SAVEMETA) |
12079a9d | 346 | while (blist && blist->b_lblkno < 0) |
e3249ec0 KM |
347 | blist = blist->b_vnbufs.qe_next; |
348 | if (!blist && (blist = vp->v_dirtyblkhd.le_next) && | |
349 | (flags & V_SAVEMETA)) | |
12079a9d | 350 | while (blist && blist->b_lblkno < 0) |
e3249ec0 | 351 | blist = blist->b_vnbufs.qe_next; |
12079a9d | 352 | if (!blist) |
76429560 | 353 | break; |
12079a9d | 354 | |
76429560 | 355 | for (bp = blist; bp; bp = nbp) { |
e3249ec0 | 356 | nbp = bp->b_vnbufs.qe_next; |
12079a9d MS |
357 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
358 | continue; | |
76429560 KM |
359 | s = splbio(); |
360 | if (bp->b_flags & B_BUSY) { | |
361 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
362 | error = tsleep((caddr_t)bp, |
363 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
364 | slptimeo); | |
76429560 | 365 | splx(s); |
c33e9e8b KM |
366 | if (error) |
367 | return (error); | |
76429560 KM |
368 | break; |
369 | } | |
370 | bremfree(bp); | |
371 | bp->b_flags |= B_BUSY; | |
372 | splx(s); | |
c33e9e8b KM |
373 | /* |
374 | * XXX Since there are no node locks for NFS, I believe | |
375 | * there is a slight chance that a delayed write will | |
376 | * occur while sleeping just above, so check for it. | |
377 | */ | |
378 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
379 | (void) VOP_BWRITE(bp); | |
380 | break; | |
381 | } | |
12079a9d | 382 | bp->b_flags |= B_INVAL; |
76429560 KM |
383 | brelse(bp); |
384 | } | |
385 | } | |
e3249ec0 KM |
386 | if (!(flags & V_SAVEMETA) && |
387 | (vp->v_dirtyblkhd.le_next || vp->v_cleanblkhd.le_next)) | |
76429560 | 388 | panic("vinvalbuf: flush failed"); |
d024c2ce | 389 | return (0); |
76429560 KM |
390 | } |
391 | ||
392 | /* | |
393 | * Associate a buffer with a vnode. | |
394 | */ | |
395 | bgetvp(vp, bp) | |
396 | register struct vnode *vp; | |
397 | register struct buf *bp; | |
398 | { | |
8136adfc | 399 | register struct vnode *vq; |
76429560 KM |
400 | |
401 | if (bp->b_vp) | |
402 | panic("bgetvp: not free"); | |
403 | VHOLD(vp); | |
404 | bp->b_vp = vp; | |
405 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
406 | bp->b_dev = vp->v_rdev; | |
407 | else | |
408 | bp->b_dev = NODEV; | |
409 | /* | |
410 | * Insert onto list for new vnode. | |
411 | */ | |
e3249ec0 | 412 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
413 | } |
414 | ||
415 | /* | |
416 | * Disassociate a buffer from a vnode. | |
417 | */ | |
418 | brelvp(bp) | |
419 | register struct buf *bp; | |
420 | { | |
76429560 KM |
421 | struct vnode *vp; |
422 | ||
423 | if (bp->b_vp == (struct vnode *) 0) | |
424 | panic("brelvp: NULL"); | |
425 | /* | |
426 | * Delete from old vnode list, if on one. | |
427 | */ | |
e3249ec0 KM |
428 | if (bp->b_vnbufs.qe_next != NOLIST) |
429 | bufremvn(bp); | |
76429560 KM |
430 | vp = bp->b_vp; |
431 | bp->b_vp = (struct vnode *) 0; | |
432 | HOLDRELE(vp); | |
433 | } | |
434 | ||
435 | /* | |
436 | * Reassign a buffer from one vnode to another. | |
437 | * Used to assign file specific control information | |
438 | * (indirect blocks) to the vnode to which they belong. | |
439 | */ | |
440 | reassignbuf(bp, newvp) | |
441 | register struct buf *bp; | |
442 | register struct vnode *newvp; | |
443 | { | |
e3249ec0 | 444 | register struct list_entry *listheadp; |
76429560 | 445 | |
e5c3f16e KM |
446 | if (newvp == NULL) { |
447 | printf("reassignbuf: NULL"); | |
448 | return; | |
449 | } | |
76429560 KM |
450 | /* |
451 | * Delete from old vnode list, if on one. | |
452 | */ | |
e3249ec0 KM |
453 | if (bp->b_vnbufs.qe_next != NOLIST) |
454 | bufremvn(bp); | |
76429560 KM |
455 | /* |
456 | * If dirty, put on list of dirty buffers; | |
457 | * otherwise insert onto list of clean buffers. | |
458 | */ | |
459 | if (bp->b_flags & B_DELWRI) | |
460 | listheadp = &newvp->v_dirtyblkhd; | |
461 | else | |
462 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 463 | bufinsvn(bp, listheadp); |
76429560 KM |
464 | } |
465 | ||
36d09cb1 | 466 | /* |
ef24f6dd KM |
467 | * Create a vnode for a block device. |
468 | * Used for root filesystem, argdev, and swap areas. | |
469 | * Also used for memory file system special devices. | |
470 | */ | |
471 | bdevvp(dev, vpp) | |
472 | dev_t dev; | |
473 | struct vnode **vpp; | |
474 | { | |
ef24f6dd KM |
475 | register struct vnode *vp; |
476 | struct vnode *nvp; | |
477 | int error; | |
478 | ||
1c89915d KM |
479 | if (dev == NODEV) |
480 | return (0); | |
9342689a | 481 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
482 | if (error) { |
483 | *vpp = 0; | |
484 | return (error); | |
485 | } | |
486 | vp = nvp; | |
487 | vp->v_type = VBLK; | |
c0de8792 | 488 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
489 | vput(vp); |
490 | vp = nvp; | |
491 | } | |
492 | *vpp = vp; | |
493 | return (0); | |
494 | } | |
495 | ||
496 | /* | |
497 | * Check to see if the new vnode represents a special device | |
498 | * for which we already have a vnode (either because of | |
499 | * bdevvp() or because of a different vnode representing | |
500 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 501 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
502 | * caller is responsible for filling it with its new contents. |
503 | */ | |
504 | struct vnode * | |
c0de8792 | 505 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 506 | register struct vnode *nvp; |
c0de8792 | 507 | dev_t nvp_rdev; |
ef24f6dd KM |
508 | struct mount *mp; |
509 | { | |
510 | register struct vnode *vp; | |
c0de8792 | 511 | struct vnode **vpp; |
ef24f6dd KM |
512 | |
513 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 514 | return (NULLVP); |
c0de8792 KM |
515 | |
516 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 517 | loop: |
c0de8792 KM |
518 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
519 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 520 | continue; |
c0de8792 KM |
521 | /* |
522 | * Alias, but not in use, so flush it out. | |
523 | */ | |
7f7b7d89 | 524 | if (vp->v_usecount == 0) { |
c0de8792 KM |
525 | vgone(vp); |
526 | goto loop; | |
527 | } | |
ef62830d KM |
528 | if (vget(vp)) |
529 | goto loop; | |
ef24f6dd KM |
530 | break; |
531 | } | |
c0de8792 | 532 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
533 | MALLOC(nvp->v_specinfo, struct specinfo *, |
534 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
535 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 536 | nvp->v_hashchain = vpp; |
c0de8792 | 537 | nvp->v_specnext = *vpp; |
2c957a90 | 538 | nvp->v_specflags = 0; |
c0de8792 | 539 | *vpp = nvp; |
40452d5e KM |
540 | if (vp != NULL) { |
541 | nvp->v_flag |= VALIASED; | |
542 | vp->v_flag |= VALIASED; | |
543 | vput(vp); | |
544 | } | |
54fb9dc2 | 545 | return (NULLVP); |
ef24f6dd | 546 | } |
2bae1875 KM |
547 | VOP_UNLOCK(vp); |
548 | vclean(vp, 0); | |
ef24f6dd KM |
549 | vp->v_op = nvp->v_op; |
550 | vp->v_tag = nvp->v_tag; | |
551 | nvp->v_type = VNON; | |
552 | insmntque(vp, mp); | |
553 | return (vp); | |
554 | } | |
555 | ||
556 | /* | |
557 | * Grab a particular vnode from the free list, increment its | |
558 | * reference count and lock it. The vnode lock bit is set the | |
559 | * vnode is being eliminated in vgone. The process is awakened | |
560 | * when the transition is completed, and an error returned to | |
561 | * indicate that the vnode is no longer usable (possibly having | |
562 | * been changed to a new file system type). | |
36d09cb1 KM |
563 | */ |
564 | vget(vp) | |
565 | register struct vnode *vp; | |
566 | { | |
567 | register struct vnode *vq; | |
568 | ||
ef24f6dd KM |
569 | if (vp->v_flag & VXLOCK) { |
570 | vp->v_flag |= VXWANT; | |
571 | sleep((caddr_t)vp, PINOD); | |
572 | return (1); | |
573 | } | |
7f7b7d89 | 574 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
575 | if (vq = vp->v_freef) |
576 | vq->v_freeb = vp->v_freeb; | |
577 | else | |
578 | vfreet = vp->v_freeb; | |
579 | *vp->v_freeb = vq; | |
580 | vp->v_freef = NULL; | |
581 | vp->v_freeb = NULL; | |
582 | } | |
36d09cb1 | 583 | VREF(vp); |
ef24f6dd KM |
584 | VOP_LOCK(vp); |
585 | return (0); | |
36d09cb1 KM |
586 | } |
587 | ||
d32390ea KM |
588 | int bug_refs = 0; |
589 | ||
36d09cb1 KM |
590 | /* |
591 | * Vnode reference, just increment the count | |
592 | */ | |
593 | void vref(vp) | |
594 | struct vnode *vp; | |
595 | { | |
596 | ||
7f7b7d89 | 597 | vp->v_usecount++; |
d32390ea KM |
598 | if (vp->v_type != VBLK && curproc) |
599 | curproc->p_spare[0]++; | |
600 | if (bug_refs) | |
601 | vprint("vref: "); | |
36d09cb1 KM |
602 | } |
603 | ||
604 | /* | |
605 | * vput(), just unlock and vrele() | |
606 | */ | |
607 | void vput(vp) | |
608 | register struct vnode *vp; | |
609 | { | |
4d1ee2eb | 610 | |
36d09cb1 KM |
611 | VOP_UNLOCK(vp); |
612 | vrele(vp); | |
613 | } | |
614 | ||
615 | /* | |
616 | * Vnode release. | |
617 | * If count drops to zero, call inactive routine and return to freelist. | |
618 | */ | |
619 | void vrele(vp) | |
620 | register struct vnode *vp; | |
621 | { | |
622 | ||
65c3b3a8 | 623 | #ifdef DIAGNOSTIC |
36d09cb1 | 624 | if (vp == NULL) |
ef24f6dd | 625 | panic("vrele: null vp"); |
65c3b3a8 | 626 | #endif |
7f7b7d89 | 627 | vp->v_usecount--; |
d32390ea KM |
628 | if (vp->v_type != VBLK && curproc) |
629 | curproc->p_spare[0]--; | |
630 | if (bug_refs) | |
631 | vprint("vref: "); | |
7f7b7d89 | 632 | if (vp->v_usecount > 0) |
36d09cb1 | 633 | return; |
65c3b3a8 KM |
634 | #ifdef DIAGNOSTIC |
635 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
636 | vprint("vrele: bad ref count", vp); | |
637 | panic("vrele: ref cnt"); | |
638 | } | |
639 | #endif | |
dc998e72 KM |
640 | /* |
641 | * insert at tail of LRU list | |
642 | */ | |
643 | *vfreet = vp; | |
644 | vp->v_freeb = vfreet; | |
ef24f6dd KM |
645 | vp->v_freef = NULL; |
646 | vfreet = &vp->v_freef; | |
d024c2ce | 647 | VOP_INACTIVE(vp); |
ef24f6dd KM |
648 | } |
649 | ||
7f7b7d89 KM |
650 | /* |
651 | * Page or buffer structure gets a reference. | |
652 | */ | |
451df175 | 653 | void vhold(vp) |
7f7b7d89 KM |
654 | register struct vnode *vp; |
655 | { | |
656 | ||
657 | vp->v_holdcnt++; | |
658 | } | |
659 | ||
660 | /* | |
661 | * Page or buffer structure frees a reference. | |
662 | */ | |
451df175 | 663 | void holdrele(vp) |
7f7b7d89 KM |
664 | register struct vnode *vp; |
665 | { | |
666 | ||
667 | if (vp->v_holdcnt <= 0) | |
668 | panic("holdrele: holdcnt"); | |
669 | vp->v_holdcnt--; | |
670 | } | |
671 | ||
f0556f86 KM |
672 | /* |
673 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
674 | * | |
675 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
676 | * return error if any are found (nb: this is a user error, not a | |
677 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
678 | * that are found. | |
679 | */ | |
680 | int busyprt = 0; /* patch to print out busy vnodes */ | |
681 | ||
682 | vflush(mp, skipvp, flags) | |
683 | struct mount *mp; | |
684 | struct vnode *skipvp; | |
685 | int flags; | |
686 | { | |
687 | register struct vnode *vp, *nvp; | |
688 | int busy = 0; | |
689 | ||
54fb9dc2 | 690 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 691 | panic("vflush: not busy"); |
4597dd33 | 692 | loop: |
54fb9dc2 | 693 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
694 | if (vp->v_mount != mp) |
695 | goto loop; | |
f0556f86 KM |
696 | nvp = vp->v_mountf; |
697 | /* | |
698 | * Skip over a selected vnode. | |
f0556f86 KM |
699 | */ |
700 | if (vp == skipvp) | |
701 | continue; | |
36ef03ec KM |
702 | /* |
703 | * Skip over a vnodes marked VSYSTEM. | |
704 | */ | |
705 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
706 | continue; | |
da374605 KM |
707 | /* |
708 | * If WRITECLOSE is set, only flush out regular file | |
709 | * vnodes open for writing. | |
710 | */ | |
711 | if ((flags & WRITECLOSE) && | |
712 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
713 | continue; | |
f0556f86 | 714 | /* |
7f7b7d89 | 715 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
716 | * out the vnode data structures and we are done. |
717 | */ | |
7f7b7d89 | 718 | if (vp->v_usecount == 0) { |
f0556f86 KM |
719 | vgone(vp); |
720 | continue; | |
721 | } | |
722 | /* | |
da374605 | 723 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
724 | * For block or character devices, revert to an |
725 | * anonymous device. For all other files, just kill them. | |
726 | */ | |
36ef03ec | 727 | if (flags & FORCECLOSE) { |
f0556f86 KM |
728 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
729 | vgone(vp); | |
730 | } else { | |
731 | vclean(vp, 0); | |
9342689a | 732 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
733 | insmntque(vp, (struct mount *)0); |
734 | } | |
735 | continue; | |
736 | } | |
737 | if (busyprt) | |
0bf84b18 | 738 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
739 | busy++; |
740 | } | |
741 | if (busy) | |
742 | return (EBUSY); | |
743 | return (0); | |
744 | } | |
745 | ||
ef24f6dd KM |
746 | /* |
747 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 748 | */ |
ecf75a7d KM |
749 | void |
750 | vclean(vp, flags) | |
ef24f6dd | 751 | register struct vnode *vp; |
aacc1bff | 752 | int flags; |
ef24f6dd | 753 | { |
2bae1875 | 754 | int active; |
ef24f6dd | 755 | |
2bae1875 KM |
756 | /* |
757 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
758 | * If so we have to reference it before we clean it out |
759 | * so that its count cannot fall to zero and generate a | |
760 | * race against ourselves to recycle it. | |
2bae1875 | 761 | */ |
7f7b7d89 | 762 | if (active = vp->v_usecount) |
2bae1875 | 763 | VREF(vp); |
669df1aa KM |
764 | /* |
765 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
766 | * have the object locked while it cleans it out. The VOP_LOCK | |
767 | * ensures that the VOP_INACTIVE routine is done with its work. | |
768 | * For active vnodes, it ensures that no other activity can | |
769 | * occur while the underlying object is being cleaned out. | |
770 | */ | |
771 | VOP_LOCK(vp); | |
2bae1875 KM |
772 | /* |
773 | * Prevent the vnode from being recycled or | |
774 | * brought into use while we clean it out. | |
775 | */ | |
0bf84b18 KM |
776 | if (vp->v_flag & VXLOCK) |
777 | panic("vclean: deadlock"); | |
ef24f6dd | 778 | vp->v_flag |= VXLOCK; |
0bf84b18 | 779 | /* |
669df1aa | 780 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 781 | */ |
36ef03ec | 782 | if (flags & DOCLOSE) |
c33e9e8b | 783 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 784 | /* |
669df1aa KM |
785 | * Any other processes trying to obtain this lock must first |
786 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 787 | */ |
669df1aa | 788 | VOP_UNLOCK(vp); |
ef24f6dd | 789 | /* |
669df1aa KM |
790 | * If purging an active vnode, it must be closed and |
791 | * deactivated before being reclaimed. | |
ef24f6dd | 792 | */ |
2bae1875 | 793 | if (active) { |
669df1aa KM |
794 | if (flags & DOCLOSE) |
795 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
796 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
797 | } |
798 | /* | |
799 | * Reclaim the vnode. | |
800 | */ | |
669df1aa | 801 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 802 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
803 | if (active) |
804 | vrele(vp); | |
38c46eee | 805 | |
ef24f6dd | 806 | /* |
669df1aa | 807 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 808 | */ |
669df1aa KM |
809 | vp->v_op = dead_vnodeop_p; |
810 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
811 | vp->v_flag &= ~VXLOCK; |
812 | if (vp->v_flag & VXWANT) { | |
813 | vp->v_flag &= ~VXWANT; | |
814 | wakeup((caddr_t)vp); | |
815 | } | |
816 | } | |
817 | ||
ef62830d KM |
818 | /* |
819 | * Eliminate all activity associated with the requested vnode | |
820 | * and with all vnodes aliased to the requested vnode. | |
821 | */ | |
822 | void vgoneall(vp) | |
823 | register struct vnode *vp; | |
824 | { | |
7f7b7d89 | 825 | register struct vnode *vq; |
ef62830d | 826 | |
7a7b3a95 KM |
827 | if (vp->v_flag & VALIASED) { |
828 | /* | |
829 | * If a vgone (or vclean) is already in progress, | |
830 | * wait until it is done and return. | |
831 | */ | |
832 | if (vp->v_flag & VXLOCK) { | |
833 | vp->v_flag |= VXWANT; | |
834 | sleep((caddr_t)vp, PINOD); | |
835 | return; | |
836 | } | |
837 | /* | |
838 | * Ensure that vp will not be vgone'd while we | |
839 | * are eliminating its aliases. | |
840 | */ | |
841 | vp->v_flag |= VXLOCK; | |
842 | while (vp->v_flag & VALIASED) { | |
843 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
844 | if (vq->v_rdev != vp->v_rdev || | |
845 | vq->v_type != vp->v_type || vp == vq) | |
846 | continue; | |
847 | vgone(vq); | |
848 | break; | |
849 | } | |
ef62830d | 850 | } |
7a7b3a95 KM |
851 | /* |
852 | * Remove the lock so that vgone below will | |
853 | * really eliminate the vnode after which time | |
854 | * vgone will awaken any sleepers. | |
855 | */ | |
856 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
857 | } |
858 | vgone(vp); | |
859 | } | |
860 | ||
ef24f6dd KM |
861 | /* |
862 | * Eliminate all activity associated with a vnode | |
863 | * in preparation for reuse. | |
864 | */ | |
865 | void vgone(vp) | |
866 | register struct vnode *vp; | |
867 | { | |
7f7b7d89 | 868 | register struct vnode *vq; |
c0de8792 | 869 | struct vnode *vx; |
ef24f6dd | 870 | |
4f55e3ec KM |
871 | /* |
872 | * If a vgone (or vclean) is already in progress, | |
873 | * wait until it is done and return. | |
874 | */ | |
875 | if (vp->v_flag & VXLOCK) { | |
876 | vp->v_flag |= VXWANT; | |
877 | sleep((caddr_t)vp, PINOD); | |
878 | return; | |
879 | } | |
ef24f6dd KM |
880 | /* |
881 | * Clean out the filesystem specific data. | |
882 | */ | |
36ef03ec | 883 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
884 | /* |
885 | * Delete from old mount point vnode list, if on one. | |
886 | */ | |
887 | if (vp->v_mountb) { | |
888 | if (vq = vp->v_mountf) | |
889 | vq->v_mountb = vp->v_mountb; | |
890 | *vp->v_mountb = vq; | |
891 | vp->v_mountf = NULL; | |
892 | vp->v_mountb = NULL; | |
d10e9258 | 893 | vp->v_mount = NULL; |
ef24f6dd KM |
894 | } |
895 | /* | |
896 | * If special device, remove it from special device alias list. | |
897 | */ | |
898 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
899 | if (*vp->v_hashchain == vp) { |
900 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 901 | } else { |
7f7b7d89 | 902 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 903 | if (vq->v_specnext != vp) |
ef24f6dd | 904 | continue; |
c0de8792 | 905 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
906 | break; |
907 | } | |
c0de8792 | 908 | if (vq == NULL) |
ef24f6dd KM |
909 | panic("missing bdev"); |
910 | } | |
c0de8792 | 911 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 912 | vx = NULL; |
7f7b7d89 | 913 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
914 | if (vq->v_rdev != vp->v_rdev || |
915 | vq->v_type != vp->v_type) | |
c0de8792 | 916 | continue; |
4d1ee2eb CT |
917 | if (vx) |
918 | break; | |
c0de8792 KM |
919 | vx = vq; |
920 | } | |
4d1ee2eb | 921 | if (vx == NULL) |
c0de8792 | 922 | panic("missing alias"); |
4d1ee2eb | 923 | if (vq == NULL) |
c0de8792 KM |
924 | vx->v_flag &= ~VALIASED; |
925 | vp->v_flag &= ~VALIASED; | |
926 | } | |
927 | FREE(vp->v_specinfo, M_VNODE); | |
928 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
929 | } |
930 | /* | |
3387ef89 KM |
931 | * If it is on the freelist and not already at the head, |
932 | * move it to the head of the list. | |
ef24f6dd | 933 | */ |
3387ef89 | 934 | if (vp->v_freeb && vfreeh != vp) { |
ef24f6dd KM |
935 | if (vq = vp->v_freef) |
936 | vq->v_freeb = vp->v_freeb; | |
937 | else | |
938 | vfreet = vp->v_freeb; | |
939 | *vp->v_freeb = vq; | |
940 | vp->v_freef = vfreeh; | |
941 | vp->v_freeb = &vfreeh; | |
942 | vfreeh->v_freeb = &vp->v_freef; | |
943 | vfreeh = vp; | |
944 | } | |
2bae1875 | 945 | vp->v_type = VBAD; |
36d09cb1 | 946 | } |
ef62830d | 947 | |
2bcd6066 KM |
948 | /* |
949 | * Lookup a vnode by device number. | |
950 | */ | |
951 | vfinddev(dev, type, vpp) | |
952 | dev_t dev; | |
953 | enum vtype type; | |
954 | struct vnode **vpp; | |
955 | { | |
956 | register struct vnode *vp; | |
957 | ||
958 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
959 | if (dev != vp->v_rdev || type != vp->v_type) | |
960 | continue; | |
961 | *vpp = vp; | |
962 | return (0); | |
963 | } | |
964 | return (1); | |
965 | } | |
966 | ||
ef62830d KM |
967 | /* |
968 | * Calculate the total number of references to a special device. | |
969 | */ | |
970 | vcount(vp) | |
971 | register struct vnode *vp; | |
972 | { | |
7f7b7d89 | 973 | register struct vnode *vq; |
ef62830d KM |
974 | int count; |
975 | ||
976 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 977 | return (vp->v_usecount); |
ef62830d | 978 | loop: |
7f7b7d89 | 979 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 980 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
981 | continue; |
982 | /* | |
983 | * Alias, but not in use, so flush it out. | |
984 | */ | |
7f7b7d89 | 985 | if (vq->v_usecount == 0) { |
ef62830d KM |
986 | vgone(vq); |
987 | goto loop; | |
988 | } | |
7f7b7d89 | 989 | count += vq->v_usecount; |
ef62830d KM |
990 | } |
991 | return (count); | |
992 | } | |
0bf84b18 KM |
993 | |
994 | /* | |
995 | * Print out a description of a vnode. | |
996 | */ | |
997 | static char *typename[] = | |
61f846a8 | 998 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
999 | |
1000 | vprint(label, vp) | |
1001 | char *label; | |
1002 | register struct vnode *vp; | |
1003 | { | |
f2f730c6 | 1004 | char buf[64]; |
0bf84b18 KM |
1005 | |
1006 | if (label != NULL) | |
1007 | printf("%s: ", label); | |
65c3b3a8 KM |
1008 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1009 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1010 | vp->v_holdcnt); | |
f2f730c6 KM |
1011 | buf[0] = '\0'; |
1012 | if (vp->v_flag & VROOT) | |
1013 | strcat(buf, "|VROOT"); | |
1014 | if (vp->v_flag & VTEXT) | |
1015 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1016 | if (vp->v_flag & VSYSTEM) |
1017 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1018 | if (vp->v_flag & VXLOCK) |
1019 | strcat(buf, "|VXLOCK"); | |
1020 | if (vp->v_flag & VXWANT) | |
1021 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1022 | if (vp->v_flag & VBWAIT) |
1023 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1024 | if (vp->v_flag & VALIASED) |
1025 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1026 | if (buf[0] != '\0') |
1027 | printf(" flags (%s)", &buf[1]); | |
1028 | printf("\n\t"); | |
0bf84b18 KM |
1029 | VOP_PRINT(vp); |
1030 | } | |
985cbdd5 | 1031 | |
34c62e18 KM |
1032 | #ifdef DEBUG |
1033 | /* | |
1034 | * List all of the locked vnodes in the system. | |
1035 | * Called when debugging the kernel. | |
1036 | */ | |
1037 | printlockedvnodes() | |
1038 | { | |
1039 | register struct mount *mp; | |
1040 | register struct vnode *vp; | |
1041 | ||
1042 | printf("Locked vnodes\n"); | |
1043 | mp = rootfs; | |
1044 | do { | |
1045 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1046 | if (VOP_ISLOCKED(vp)) | |
1047 | vprint((char *)0, vp); | |
1048 | mp = mp->mnt_next; | |
1049 | } while (mp != rootfs); | |
1050 | } | |
1051 | #endif | |
1052 | ||
985cbdd5 MT |
1053 | int kinfo_vdebug = 1; |
1054 | int kinfo_vgetfailed; | |
1055 | #define KINFO_VNODESLOP 10 | |
1056 | /* | |
786fb484 | 1057 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1058 | * Copyout address of vnode followed by vnode. |
1059 | */ | |
aacc1bff | 1060 | /* ARGSUSED */ |
786fb484 | 1061 | sysctl_vnode(where, sizep) |
985cbdd5 | 1062 | char *where; |
786fb484 | 1063 | int *sizep; |
985cbdd5 MT |
1064 | { |
1065 | register struct mount *mp = rootfs; | |
36ef03ec | 1066 | struct mount *omp; |
985cbdd5 | 1067 | struct vnode *vp; |
985cbdd5 | 1068 | register char *bp = where, *savebp; |
5bf57294 | 1069 | char *ewhere; |
985cbdd5 MT |
1070 | int error; |
1071 | ||
1072 | #define VPTRSZ sizeof (struct vnode *) | |
1073 | #define VNODESZ sizeof (struct vnode) | |
1074 | if (where == NULL) { | |
786fb484 | 1075 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1076 | return (0); |
1077 | } | |
786fb484 | 1078 | ewhere = where + *sizep; |
985cbdd5 | 1079 | |
985cbdd5 | 1080 | do { |
36ef03ec | 1081 | if (vfs_busy(mp)) { |
54fb9dc2 | 1082 | mp = mp->mnt_next; |
36ef03ec KM |
1083 | continue; |
1084 | } | |
985cbdd5 MT |
1085 | savebp = bp; |
1086 | again: | |
4597dd33 | 1087 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1088 | /* |
1089 | * Check that the vp is still associated with | |
1090 | * this filesystem. RACE: could have been | |
1091 | * recycled onto the same filesystem. | |
1092 | */ | |
4597dd33 KM |
1093 | if (vp->v_mount != mp) { |
1094 | if (kinfo_vdebug) | |
1095 | printf("kinfo: vp changed\n"); | |
1096 | bp = savebp; | |
1097 | goto again; | |
1098 | } | |
786fb484 KM |
1099 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1100 | *sizep = bp - where; | |
1101 | return (ENOMEM); | |
1102 | } | |
1103 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1104 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1105 | return (error); |
985cbdd5 | 1106 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1107 | } |
36ef03ec | 1108 | omp = mp; |
54fb9dc2 | 1109 | mp = mp->mnt_next; |
36ef03ec | 1110 | vfs_unbusy(omp); |
985cbdd5 MT |
1111 | } while (mp != rootfs); |
1112 | ||
786fb484 | 1113 | *sizep = bp - where; |
985cbdd5 MT |
1114 | return (0); |
1115 | } |