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 | * |
bb4964fd | 7 | * @(#)vfs_subr.c 7.100 (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 | |
bb4964fd KM |
27 | #include <vm/vm.h> |
28 | #include <sys/sysctl.h> | |
29 | ||
021de758 JSP |
30 | #include <miscfs/specfs/specdev.h> |
31 | ||
807cc430 KM |
32 | enum vtype iftovt_tab[16] = { |
33 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
34 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
35 | }; | |
36 | int vttoif_tab[9] = { | |
37 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
38 | S_IFSOCK, S_IFIFO, S_IFMT, | |
39 | }; | |
40 | ||
e3249ec0 KM |
41 | /* |
42 | * Insq/Remq for the vnode usage lists. | |
43 | */ | |
44 | #define bufinsvn(bp, dp) list_enter_head(dp, bp, struct buf *, b_vnbufs) | |
45 | #define bufremvn(bp) list_remove(bp, struct buf *, b_vnbufs) | |
46 | ||
3c4390e8 KM |
47 | /* |
48 | * Remove a mount point from the list of mounted filesystems. | |
49 | * Unmount of the root is illegal. | |
50 | */ | |
51 | void | |
52 | vfs_remove(mp) | |
53 | register struct mount *mp; | |
54 | { | |
55 | ||
56 | if (mp == rootfs) | |
57 | panic("vfs_remove: unmounting root"); | |
54fb9dc2 KM |
58 | mp->mnt_prev->mnt_next = mp->mnt_next; |
59 | mp->mnt_next->mnt_prev = mp->mnt_prev; | |
60 | mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0; | |
3c4390e8 KM |
61 | vfs_unlock(mp); |
62 | } | |
63 | ||
64 | /* | |
65 | * Lock a filesystem. | |
66 | * Used to prevent access to it while mounting and unmounting. | |
67 | */ | |
68 | vfs_lock(mp) | |
69 | register struct mount *mp; | |
70 | { | |
71 | ||
54fb9dc2 KM |
72 | while(mp->mnt_flag & MNT_MLOCK) { |
73 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
74 | sleep((caddr_t)mp, PVFS); |
75 | } | |
54fb9dc2 | 76 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
77 | return (0); |
78 | } | |
79 | ||
80 | /* | |
81 | * Unlock a locked filesystem. | |
82 | * Panic if filesystem is not locked. | |
83 | */ | |
84 | void | |
85 | vfs_unlock(mp) | |
86 | register struct mount *mp; | |
87 | { | |
88 | ||
54fb9dc2 | 89 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 90 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
91 | mp->mnt_flag &= ~MNT_MLOCK; |
92 | if (mp->mnt_flag & MNT_MWAIT) { | |
93 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
94 | wakeup((caddr_t)mp); |
95 | } | |
96 | } | |
97 | ||
36ef03ec KM |
98 | /* |
99 | * Mark a mount point as busy. | |
100 | * Used to synchronize access and to delay unmounting. | |
101 | */ | |
102 | vfs_busy(mp) | |
103 | register struct mount *mp; | |
104 | { | |
105 | ||
54fb9dc2 KM |
106 | while(mp->mnt_flag & MNT_MPBUSY) { |
107 | mp->mnt_flag |= MNT_MPWANT; | |
108 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 109 | } |
d8b63609 KM |
110 | if (mp->mnt_flag & MNT_UNMOUNT) |
111 | return (1); | |
54fb9dc2 | 112 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
113 | return (0); |
114 | } | |
115 | ||
116 | /* | |
117 | * Free a busy filesystem. | |
118 | * Panic if filesystem is not busy. | |
119 | */ | |
36ef03ec KM |
120 | vfs_unbusy(mp) |
121 | register struct mount *mp; | |
122 | { | |
123 | ||
54fb9dc2 | 124 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 125 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
126 | mp->mnt_flag &= ~MNT_MPBUSY; |
127 | if (mp->mnt_flag & MNT_MPWANT) { | |
128 | mp->mnt_flag &= ~MNT_MPWANT; | |
129 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
130 | } |
131 | } | |
132 | ||
3c4390e8 KM |
133 | /* |
134 | * Lookup a mount point by filesystem identifier. | |
135 | */ | |
136 | struct mount * | |
137 | getvfs(fsid) | |
138 | fsid_t *fsid; | |
139 | { | |
140 | register struct mount *mp; | |
141 | ||
d713f801 KM |
142 | mp = rootfs; |
143 | do { | |
54fb9dc2 KM |
144 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
145 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) { | |
d713f801 | 146 | return (mp); |
3c4390e8 | 147 | } |
54fb9dc2 | 148 | mp = mp->mnt_next; |
d713f801 KM |
149 | } while (mp != rootfs); |
150 | return ((struct mount *)0); | |
3c4390e8 KM |
151 | } |
152 | ||
917dc539 JSP |
153 | /* |
154 | * Get a new unique fsid | |
155 | */ | |
156 | void | |
157 | getnewfsid(mp, mtype) | |
158 | struct mount *mp; | |
159 | int mtype; | |
160 | { | |
161 | static u_short xxxfs_mntid; | |
162 | ||
163 | fsid_t tfsid; | |
164 | ||
165 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + 11, 0); /* XXX */ | |
166 | mp->mnt_stat.f_fsid.val[1] = mtype; | |
167 | if (xxxfs_mntid == 0) | |
168 | ++xxxfs_mntid; | |
169 | tfsid.val[0] = makedev(nblkdev, xxxfs_mntid); | |
170 | tfsid.val[1] = mtype; | |
17fd1cc7 JSP |
171 | if (rootfs) { |
172 | while (getvfs(&tfsid)) { | |
173 | tfsid.val[0]++; | |
174 | xxxfs_mntid++; | |
175 | } | |
917dc539 JSP |
176 | } |
177 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
178 | } | |
179 | ||
3c4390e8 KM |
180 | /* |
181 | * Set vnode attributes to VNOVAL | |
182 | */ | |
183 | void vattr_null(vap) | |
184 | register struct vattr *vap; | |
185 | { | |
186 | ||
187 | vap->va_type = VNON; | |
83504fd5 | 188 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 189 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
190 | vap->va_fsid = vap->va_fileid = |
191 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
192 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
193 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
194 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 195 | vap->va_flags = vap->va_gen = VNOVAL; |
fcba749b | 196 | vap->va_vaflags = 0; |
3c4390e8 | 197 | } |
c60798ca | 198 | |
36d09cb1 KM |
199 | /* |
200 | * Routines having to do with the management of the vnode table. | |
201 | */ | |
dc998e72 | 202 | struct vnode *vfreeh, **vfreet = &vfreeh; |
9342689a | 203 | extern int (**dead_vnodeop_p)(); |
32339c94 | 204 | extern void vclean(); |
1a80f56e | 205 | long numvnodes; |
e781da98 | 206 | extern struct vattr va_null; |
36d09cb1 | 207 | |
1f9d2249 | 208 | |
36d09cb1 KM |
209 | /* |
210 | * Return the next vnode from the free list. | |
211 | */ | |
212 | getnewvnode(tag, mp, vops, vpp) | |
213 | enum vtagtype tag; | |
214 | struct mount *mp; | |
cf74dd57 | 215 | int (**vops)(); |
36d09cb1 KM |
216 | struct vnode **vpp; |
217 | { | |
218 | register struct vnode *vp, *vq; | |
1f9d2249 | 219 | int s; |
36d09cb1 | 220 | |
ecf75a7d KM |
221 | if ((vfreeh == NULL && numvnodes < 2 * desiredvnodes) || |
222 | numvnodes < desiredvnodes) { | |
aacc1bff KM |
223 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
224 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
225 | bzero((char *)vp, sizeof *vp); |
226 | numvnodes++; | |
227 | } else { | |
228 | if ((vp = vfreeh) == NULL) { | |
229 | tablefull("vnode"); | |
230 | *vpp = 0; | |
231 | return (ENFILE); | |
232 | } | |
233 | if (vp->v_usecount) | |
234 | panic("free vnode isn't"); | |
235 | if (vq = vp->v_freef) | |
236 | vq->v_freeb = &vfreeh; | |
237 | else | |
238 | vfreet = &vfreeh; | |
239 | vfreeh = vq; | |
240 | vp->v_freef = NULL; | |
241 | vp->v_freeb = NULL; | |
39b99eb6 | 242 | vp->v_lease = NULL; |
1a80f56e KM |
243 | if (vp->v_type != VBAD) |
244 | vgone(vp); | |
1f9d2249 | 245 | #ifdef DIAGNOSTIC |
2345b093 KM |
246 | if (vp->v_data) |
247 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
248 | s = splbio(); |
249 | if (vp->v_numoutput) | |
250 | panic("Clean vnode has pending I/O's"); | |
251 | splx(s); | |
252 | #endif | |
1a80f56e | 253 | vp->v_flag = 0; |
1a80f56e | 254 | vp->v_lastr = 0; |
1f9d2249 MS |
255 | vp->v_lastw = 0; |
256 | vp->v_lasta = 0; | |
257 | vp->v_cstart = 0; | |
258 | vp->v_clen = 0; | |
1a80f56e | 259 | vp->v_socket = 0; |
36d09cb1 | 260 | } |
1f9d2249 | 261 | vp->v_ralen = 1; |
b027498b | 262 | vp->v_type = VNON; |
36d09cb1 KM |
263 | cache_purge(vp); |
264 | vp->v_tag = tag; | |
ef24f6dd | 265 | vp->v_op = vops; |
36d09cb1 | 266 | insmntque(vp, mp); |
ec04fc59 | 267 | vp->v_usecount++; |
36d09cb1 KM |
268 | *vpp = vp; |
269 | return (0); | |
270 | } | |
36d09cb1 KM |
271 | /* |
272 | * Move a vnode from one mount queue to another. | |
273 | */ | |
274 | insmntque(vp, mp) | |
275 | register struct vnode *vp; | |
276 | register struct mount *mp; | |
277 | { | |
8136adfc | 278 | register struct vnode *vq; |
36d09cb1 KM |
279 | |
280 | /* | |
281 | * Delete from old mount point vnode list, if on one. | |
282 | */ | |
283 | if (vp->v_mountb) { | |
284 | if (vq = vp->v_mountf) | |
285 | vq->v_mountb = vp->v_mountb; | |
286 | *vp->v_mountb = vq; | |
287 | } | |
288 | /* | |
289 | * Insert into list of vnodes for the new mount point, if available. | |
290 | */ | |
a45ff315 | 291 | vp->v_mount = mp; |
36d09cb1 KM |
292 | if (mp == NULL) { |
293 | vp->v_mountf = NULL; | |
294 | vp->v_mountb = NULL; | |
295 | return; | |
296 | } | |
8136adfc KM |
297 | if (vq = mp->mnt_mounth) |
298 | vq->v_mountb = &vp->v_mountf; | |
299 | vp->v_mountf = vq; | |
300 | vp->v_mountb = &mp->mnt_mounth; | |
301 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
302 | } |
303 | ||
76429560 KM |
304 | /* |
305 | * Update outstanding I/O count and do wakeup if requested. | |
306 | */ | |
307 | vwakeup(bp) | |
308 | register struct buf *bp; | |
309 | { | |
310 | register struct vnode *vp; | |
311 | ||
a9338fad | 312 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
313 | if (vp = bp->b_vp) { |
314 | vp->v_numoutput--; | |
1f9d2249 MS |
315 | if (vp->v_numoutput < 0) |
316 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
317 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
318 | if (vp->v_numoutput < 0) | |
319 | panic("vwakeup: neg numoutput"); | |
320 | vp->v_flag &= ~VBWAIT; | |
321 | wakeup((caddr_t)&vp->v_numoutput); | |
322 | } | |
323 | } | |
324 | } | |
325 | ||
76429560 KM |
326 | /* |
327 | * Flush out and invalidate all buffers associated with a vnode. | |
328 | * Called with the underlying object locked. | |
329 | */ | |
d024c2ce | 330 | int |
c33e9e8b | 331 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 332 | register struct vnode *vp; |
12079a9d | 333 | int flags; |
d024c2ce KM |
334 | struct ucred *cred; |
335 | struct proc *p; | |
c33e9e8b | 336 | int slpflag, slptimeo; |
76429560 KM |
337 | { |
338 | register struct buf *bp; | |
339 | struct buf *nbp, *blist; | |
d024c2ce | 340 | int s, error; |
76429560 | 341 | |
12079a9d | 342 | if (flags & V_SAVE) { |
d024c2ce KM |
343 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
344 | return (error); | |
e3249ec0 | 345 | if (vp->v_dirtyblkhd.le_next != NULL) |
d024c2ce KM |
346 | panic("vinvalbuf: dirty bufs"); |
347 | } | |
76429560 | 348 | for (;;) { |
e3249ec0 | 349 | if ((blist = vp->v_cleanblkhd.le_next) && flags & V_SAVEMETA) |
12079a9d | 350 | while (blist && blist->b_lblkno < 0) |
e3249ec0 KM |
351 | blist = blist->b_vnbufs.qe_next; |
352 | if (!blist && (blist = vp->v_dirtyblkhd.le_next) && | |
353 | (flags & V_SAVEMETA)) | |
12079a9d | 354 | while (blist && blist->b_lblkno < 0) |
e3249ec0 | 355 | blist = blist->b_vnbufs.qe_next; |
12079a9d | 356 | if (!blist) |
76429560 | 357 | break; |
12079a9d | 358 | |
76429560 | 359 | for (bp = blist; bp; bp = nbp) { |
e3249ec0 | 360 | nbp = bp->b_vnbufs.qe_next; |
12079a9d MS |
361 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
362 | continue; | |
76429560 KM |
363 | s = splbio(); |
364 | if (bp->b_flags & B_BUSY) { | |
365 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
366 | error = tsleep((caddr_t)bp, |
367 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
368 | slptimeo); | |
76429560 | 369 | splx(s); |
c33e9e8b KM |
370 | if (error) |
371 | return (error); | |
76429560 KM |
372 | break; |
373 | } | |
374 | bremfree(bp); | |
375 | bp->b_flags |= B_BUSY; | |
376 | splx(s); | |
c33e9e8b KM |
377 | /* |
378 | * XXX Since there are no node locks for NFS, I believe | |
379 | * there is a slight chance that a delayed write will | |
380 | * occur while sleeping just above, so check for it. | |
381 | */ | |
382 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
383 | (void) VOP_BWRITE(bp); | |
384 | break; | |
385 | } | |
12079a9d | 386 | bp->b_flags |= B_INVAL; |
76429560 KM |
387 | brelse(bp); |
388 | } | |
389 | } | |
e3249ec0 KM |
390 | if (!(flags & V_SAVEMETA) && |
391 | (vp->v_dirtyblkhd.le_next || vp->v_cleanblkhd.le_next)) | |
76429560 | 392 | panic("vinvalbuf: flush failed"); |
d024c2ce | 393 | return (0); |
76429560 KM |
394 | } |
395 | ||
396 | /* | |
397 | * Associate a buffer with a vnode. | |
398 | */ | |
399 | bgetvp(vp, bp) | |
400 | register struct vnode *vp; | |
401 | register struct buf *bp; | |
402 | { | |
8136adfc | 403 | register struct vnode *vq; |
76429560 KM |
404 | |
405 | if (bp->b_vp) | |
406 | panic("bgetvp: not free"); | |
407 | VHOLD(vp); | |
408 | bp->b_vp = vp; | |
409 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
410 | bp->b_dev = vp->v_rdev; | |
411 | else | |
412 | bp->b_dev = NODEV; | |
413 | /* | |
414 | * Insert onto list for new vnode. | |
415 | */ | |
e3249ec0 | 416 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
417 | } |
418 | ||
419 | /* | |
420 | * Disassociate a buffer from a vnode. | |
421 | */ | |
422 | brelvp(bp) | |
423 | register struct buf *bp; | |
424 | { | |
76429560 KM |
425 | struct vnode *vp; |
426 | ||
427 | if (bp->b_vp == (struct vnode *) 0) | |
428 | panic("brelvp: NULL"); | |
429 | /* | |
430 | * Delete from old vnode list, if on one. | |
431 | */ | |
e3249ec0 KM |
432 | if (bp->b_vnbufs.qe_next != NOLIST) |
433 | bufremvn(bp); | |
76429560 KM |
434 | vp = bp->b_vp; |
435 | bp->b_vp = (struct vnode *) 0; | |
436 | HOLDRELE(vp); | |
437 | } | |
438 | ||
439 | /* | |
440 | * Reassign a buffer from one vnode to another. | |
441 | * Used to assign file specific control information | |
442 | * (indirect blocks) to the vnode to which they belong. | |
443 | */ | |
444 | reassignbuf(bp, newvp) | |
445 | register struct buf *bp; | |
446 | register struct vnode *newvp; | |
447 | { | |
e3249ec0 | 448 | register struct list_entry *listheadp; |
76429560 | 449 | |
e5c3f16e KM |
450 | if (newvp == NULL) { |
451 | printf("reassignbuf: NULL"); | |
452 | return; | |
453 | } | |
76429560 KM |
454 | /* |
455 | * Delete from old vnode list, if on one. | |
456 | */ | |
e3249ec0 KM |
457 | if (bp->b_vnbufs.qe_next != NOLIST) |
458 | bufremvn(bp); | |
76429560 KM |
459 | /* |
460 | * If dirty, put on list of dirty buffers; | |
461 | * otherwise insert onto list of clean buffers. | |
462 | */ | |
463 | if (bp->b_flags & B_DELWRI) | |
464 | listheadp = &newvp->v_dirtyblkhd; | |
465 | else | |
466 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 467 | bufinsvn(bp, listheadp); |
76429560 KM |
468 | } |
469 | ||
36d09cb1 | 470 | /* |
ef24f6dd KM |
471 | * Create a vnode for a block device. |
472 | * Used for root filesystem, argdev, and swap areas. | |
473 | * Also used for memory file system special devices. | |
474 | */ | |
475 | bdevvp(dev, vpp) | |
476 | dev_t dev; | |
477 | struct vnode **vpp; | |
478 | { | |
ef24f6dd KM |
479 | register struct vnode *vp; |
480 | struct vnode *nvp; | |
481 | int error; | |
482 | ||
1c89915d KM |
483 | if (dev == NODEV) |
484 | return (0); | |
9342689a | 485 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
486 | if (error) { |
487 | *vpp = 0; | |
488 | return (error); | |
489 | } | |
490 | vp = nvp; | |
491 | vp->v_type = VBLK; | |
c0de8792 | 492 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
493 | vput(vp); |
494 | vp = nvp; | |
495 | } | |
496 | *vpp = vp; | |
497 | return (0); | |
498 | } | |
499 | ||
500 | /* | |
501 | * Check to see if the new vnode represents a special device | |
502 | * for which we already have a vnode (either because of | |
503 | * bdevvp() or because of a different vnode representing | |
504 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 505 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
506 | * caller is responsible for filling it with its new contents. |
507 | */ | |
508 | struct vnode * | |
c0de8792 | 509 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 510 | register struct vnode *nvp; |
c0de8792 | 511 | dev_t nvp_rdev; |
ef24f6dd KM |
512 | struct mount *mp; |
513 | { | |
514 | register struct vnode *vp; | |
c0de8792 | 515 | struct vnode **vpp; |
ef24f6dd KM |
516 | |
517 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 518 | return (NULLVP); |
c0de8792 KM |
519 | |
520 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 521 | loop: |
c0de8792 KM |
522 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
523 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 524 | continue; |
c0de8792 KM |
525 | /* |
526 | * Alias, but not in use, so flush it out. | |
527 | */ | |
7f7b7d89 | 528 | if (vp->v_usecount == 0) { |
c0de8792 KM |
529 | vgone(vp); |
530 | goto loop; | |
531 | } | |
ef62830d KM |
532 | if (vget(vp)) |
533 | goto loop; | |
ef24f6dd KM |
534 | break; |
535 | } | |
c0de8792 | 536 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
537 | MALLOC(nvp->v_specinfo, struct specinfo *, |
538 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
539 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 540 | nvp->v_hashchain = vpp; |
c0de8792 | 541 | nvp->v_specnext = *vpp; |
2c957a90 | 542 | nvp->v_specflags = 0; |
c0de8792 | 543 | *vpp = nvp; |
40452d5e KM |
544 | if (vp != NULL) { |
545 | nvp->v_flag |= VALIASED; | |
546 | vp->v_flag |= VALIASED; | |
547 | vput(vp); | |
548 | } | |
54fb9dc2 | 549 | return (NULLVP); |
ef24f6dd | 550 | } |
2bae1875 KM |
551 | VOP_UNLOCK(vp); |
552 | vclean(vp, 0); | |
ef24f6dd KM |
553 | vp->v_op = nvp->v_op; |
554 | vp->v_tag = nvp->v_tag; | |
555 | nvp->v_type = VNON; | |
556 | insmntque(vp, mp); | |
557 | return (vp); | |
558 | } | |
559 | ||
560 | /* | |
561 | * Grab a particular vnode from the free list, increment its | |
562 | * reference count and lock it. The vnode lock bit is set the | |
563 | * vnode is being eliminated in vgone. The process is awakened | |
564 | * when the transition is completed, and an error returned to | |
565 | * indicate that the vnode is no longer usable (possibly having | |
566 | * been changed to a new file system type). | |
36d09cb1 KM |
567 | */ |
568 | vget(vp) | |
569 | register struct vnode *vp; | |
570 | { | |
571 | register struct vnode *vq; | |
572 | ||
ef24f6dd KM |
573 | if (vp->v_flag & VXLOCK) { |
574 | vp->v_flag |= VXWANT; | |
575 | sleep((caddr_t)vp, PINOD); | |
576 | return (1); | |
577 | } | |
7f7b7d89 | 578 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
579 | if (vq = vp->v_freef) |
580 | vq->v_freeb = vp->v_freeb; | |
581 | else | |
582 | vfreet = vp->v_freeb; | |
583 | *vp->v_freeb = vq; | |
584 | vp->v_freef = NULL; | |
585 | vp->v_freeb = NULL; | |
586 | } | |
ec04fc59 | 587 | vp->v_usecount++; |
ef24f6dd KM |
588 | VOP_LOCK(vp); |
589 | return (0); | |
36d09cb1 KM |
590 | } |
591 | ||
d32390ea KM |
592 | int bug_refs = 0; |
593 | ||
36d09cb1 KM |
594 | /* |
595 | * Vnode reference, just increment the count | |
596 | */ | |
597 | void vref(vp) | |
598 | struct vnode *vp; | |
599 | { | |
600 | ||
ec04fc59 KM |
601 | if (vp->v_usecount <= 0) |
602 | panic("vref used where vget required"); | |
7f7b7d89 | 603 | vp->v_usecount++; |
d32390ea KM |
604 | if (vp->v_type != VBLK && curproc) |
605 | curproc->p_spare[0]++; | |
606 | if (bug_refs) | |
607 | vprint("vref: "); | |
36d09cb1 KM |
608 | } |
609 | ||
610 | /* | |
611 | * vput(), just unlock and vrele() | |
612 | */ | |
613 | void vput(vp) | |
614 | register struct vnode *vp; | |
615 | { | |
4d1ee2eb | 616 | |
36d09cb1 KM |
617 | VOP_UNLOCK(vp); |
618 | vrele(vp); | |
619 | } | |
620 | ||
621 | /* | |
622 | * Vnode release. | |
623 | * If count drops to zero, call inactive routine and return to freelist. | |
624 | */ | |
625 | void vrele(vp) | |
626 | register struct vnode *vp; | |
627 | { | |
628 | ||
65c3b3a8 | 629 | #ifdef DIAGNOSTIC |
36d09cb1 | 630 | if (vp == NULL) |
ef24f6dd | 631 | panic("vrele: null vp"); |
65c3b3a8 | 632 | #endif |
7f7b7d89 | 633 | vp->v_usecount--; |
d32390ea KM |
634 | if (vp->v_type != VBLK && curproc) |
635 | curproc->p_spare[0]--; | |
636 | if (bug_refs) | |
637 | vprint("vref: "); | |
7f7b7d89 | 638 | if (vp->v_usecount > 0) |
36d09cb1 | 639 | return; |
65c3b3a8 KM |
640 | #ifdef DIAGNOSTIC |
641 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
642 | vprint("vrele: bad ref count", vp); | |
643 | panic("vrele: ref cnt"); | |
644 | } | |
645 | #endif | |
dc998e72 KM |
646 | /* |
647 | * insert at tail of LRU list | |
648 | */ | |
649 | *vfreet = vp; | |
650 | vp->v_freeb = vfreet; | |
ef24f6dd KM |
651 | vp->v_freef = NULL; |
652 | vfreet = &vp->v_freef; | |
d024c2ce | 653 | VOP_INACTIVE(vp); |
ef24f6dd KM |
654 | } |
655 | ||
7f7b7d89 KM |
656 | /* |
657 | * Page or buffer structure gets a reference. | |
658 | */ | |
451df175 | 659 | void vhold(vp) |
7f7b7d89 KM |
660 | register struct vnode *vp; |
661 | { | |
662 | ||
663 | vp->v_holdcnt++; | |
664 | } | |
665 | ||
666 | /* | |
667 | * Page or buffer structure frees a reference. | |
668 | */ | |
451df175 | 669 | void holdrele(vp) |
7f7b7d89 KM |
670 | register struct vnode *vp; |
671 | { | |
672 | ||
673 | if (vp->v_holdcnt <= 0) | |
674 | panic("holdrele: holdcnt"); | |
675 | vp->v_holdcnt--; | |
676 | } | |
677 | ||
f0556f86 KM |
678 | /* |
679 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
680 | * | |
681 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
682 | * return error if any are found (nb: this is a user error, not a | |
683 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
684 | * that are found. | |
685 | */ | |
bb4964fd KM |
686 | int busyprt = 0; /* print out busy vnodes */ |
687 | struct ctldebug debug1 = { "busyprt", &busyprt }; | |
f0556f86 KM |
688 | |
689 | vflush(mp, skipvp, flags) | |
690 | struct mount *mp; | |
691 | struct vnode *skipvp; | |
692 | int flags; | |
693 | { | |
694 | register struct vnode *vp, *nvp; | |
695 | int busy = 0; | |
696 | ||
54fb9dc2 | 697 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 698 | panic("vflush: not busy"); |
4597dd33 | 699 | loop: |
54fb9dc2 | 700 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
701 | if (vp->v_mount != mp) |
702 | goto loop; | |
f0556f86 KM |
703 | nvp = vp->v_mountf; |
704 | /* | |
705 | * Skip over a selected vnode. | |
f0556f86 KM |
706 | */ |
707 | if (vp == skipvp) | |
708 | continue; | |
36ef03ec KM |
709 | /* |
710 | * Skip over a vnodes marked VSYSTEM. | |
711 | */ | |
712 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
713 | continue; | |
da374605 KM |
714 | /* |
715 | * If WRITECLOSE is set, only flush out regular file | |
716 | * vnodes open for writing. | |
717 | */ | |
718 | if ((flags & WRITECLOSE) && | |
719 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
720 | continue; | |
f0556f86 | 721 | /* |
7f7b7d89 | 722 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
723 | * out the vnode data structures and we are done. |
724 | */ | |
7f7b7d89 | 725 | if (vp->v_usecount == 0) { |
f0556f86 KM |
726 | vgone(vp); |
727 | continue; | |
728 | } | |
729 | /* | |
da374605 | 730 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
731 | * For block or character devices, revert to an |
732 | * anonymous device. For all other files, just kill them. | |
733 | */ | |
36ef03ec | 734 | if (flags & FORCECLOSE) { |
f0556f86 KM |
735 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
736 | vgone(vp); | |
737 | } else { | |
738 | vclean(vp, 0); | |
9342689a | 739 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
740 | insmntque(vp, (struct mount *)0); |
741 | } | |
742 | continue; | |
743 | } | |
744 | if (busyprt) | |
0bf84b18 | 745 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
746 | busy++; |
747 | } | |
748 | if (busy) | |
749 | return (EBUSY); | |
750 | return (0); | |
751 | } | |
752 | ||
ef24f6dd KM |
753 | /* |
754 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 755 | */ |
ecf75a7d KM |
756 | void |
757 | vclean(vp, flags) | |
ef24f6dd | 758 | register struct vnode *vp; |
aacc1bff | 759 | int flags; |
ef24f6dd | 760 | { |
2bae1875 | 761 | int active; |
ef24f6dd | 762 | |
2bae1875 KM |
763 | /* |
764 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
765 | * If so we have to reference it before we clean it out |
766 | * so that its count cannot fall to zero and generate a | |
767 | * race against ourselves to recycle it. | |
2bae1875 | 768 | */ |
7f7b7d89 | 769 | if (active = vp->v_usecount) |
2bae1875 | 770 | VREF(vp); |
669df1aa KM |
771 | /* |
772 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
773 | * have the object locked while it cleans it out. The VOP_LOCK | |
774 | * ensures that the VOP_INACTIVE routine is done with its work. | |
775 | * For active vnodes, it ensures that no other activity can | |
776 | * occur while the underlying object is being cleaned out. | |
777 | */ | |
778 | VOP_LOCK(vp); | |
2bae1875 KM |
779 | /* |
780 | * Prevent the vnode from being recycled or | |
781 | * brought into use while we clean it out. | |
782 | */ | |
0bf84b18 KM |
783 | if (vp->v_flag & VXLOCK) |
784 | panic("vclean: deadlock"); | |
ef24f6dd | 785 | vp->v_flag |= VXLOCK; |
0bf84b18 | 786 | /* |
669df1aa | 787 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 788 | */ |
36ef03ec | 789 | if (flags & DOCLOSE) |
c33e9e8b | 790 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 791 | /* |
669df1aa KM |
792 | * Any other processes trying to obtain this lock must first |
793 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 794 | */ |
669df1aa | 795 | VOP_UNLOCK(vp); |
ef24f6dd | 796 | /* |
669df1aa KM |
797 | * If purging an active vnode, it must be closed and |
798 | * deactivated before being reclaimed. | |
ef24f6dd | 799 | */ |
2bae1875 | 800 | if (active) { |
669df1aa KM |
801 | if (flags & DOCLOSE) |
802 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
803 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
804 | } |
805 | /* | |
806 | * Reclaim the vnode. | |
807 | */ | |
669df1aa | 808 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 809 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
810 | if (active) |
811 | vrele(vp); | |
38c46eee | 812 | |
ef24f6dd | 813 | /* |
669df1aa | 814 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 815 | */ |
669df1aa KM |
816 | vp->v_op = dead_vnodeop_p; |
817 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
818 | vp->v_flag &= ~VXLOCK; |
819 | if (vp->v_flag & VXWANT) { | |
820 | vp->v_flag &= ~VXWANT; | |
821 | wakeup((caddr_t)vp); | |
822 | } | |
823 | } | |
824 | ||
ef62830d KM |
825 | /* |
826 | * Eliminate all activity associated with the requested vnode | |
827 | * and with all vnodes aliased to the requested vnode. | |
828 | */ | |
829 | void vgoneall(vp) | |
830 | register struct vnode *vp; | |
831 | { | |
7f7b7d89 | 832 | register struct vnode *vq; |
ef62830d | 833 | |
7a7b3a95 KM |
834 | if (vp->v_flag & VALIASED) { |
835 | /* | |
836 | * If a vgone (or vclean) is already in progress, | |
837 | * wait until it is done and return. | |
838 | */ | |
839 | if (vp->v_flag & VXLOCK) { | |
840 | vp->v_flag |= VXWANT; | |
841 | sleep((caddr_t)vp, PINOD); | |
842 | return; | |
843 | } | |
844 | /* | |
845 | * Ensure that vp will not be vgone'd while we | |
846 | * are eliminating its aliases. | |
847 | */ | |
848 | vp->v_flag |= VXLOCK; | |
849 | while (vp->v_flag & VALIASED) { | |
850 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
851 | if (vq->v_rdev != vp->v_rdev || | |
852 | vq->v_type != vp->v_type || vp == vq) | |
853 | continue; | |
854 | vgone(vq); | |
855 | break; | |
856 | } | |
ef62830d | 857 | } |
7a7b3a95 KM |
858 | /* |
859 | * Remove the lock so that vgone below will | |
860 | * really eliminate the vnode after which time | |
861 | * vgone will awaken any sleepers. | |
862 | */ | |
863 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
864 | } |
865 | vgone(vp); | |
866 | } | |
867 | ||
ef24f6dd KM |
868 | /* |
869 | * Eliminate all activity associated with a vnode | |
870 | * in preparation for reuse. | |
871 | */ | |
872 | void vgone(vp) | |
873 | register struct vnode *vp; | |
874 | { | |
7f7b7d89 | 875 | register struct vnode *vq; |
c0de8792 | 876 | struct vnode *vx; |
ef24f6dd | 877 | |
4f55e3ec KM |
878 | /* |
879 | * If a vgone (or vclean) is already in progress, | |
880 | * wait until it is done and return. | |
881 | */ | |
882 | if (vp->v_flag & VXLOCK) { | |
883 | vp->v_flag |= VXWANT; | |
884 | sleep((caddr_t)vp, PINOD); | |
885 | return; | |
886 | } | |
ef24f6dd KM |
887 | /* |
888 | * Clean out the filesystem specific data. | |
889 | */ | |
36ef03ec | 890 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
891 | /* |
892 | * Delete from old mount point vnode list, if on one. | |
893 | */ | |
894 | if (vp->v_mountb) { | |
895 | if (vq = vp->v_mountf) | |
896 | vq->v_mountb = vp->v_mountb; | |
897 | *vp->v_mountb = vq; | |
898 | vp->v_mountf = NULL; | |
899 | vp->v_mountb = NULL; | |
d10e9258 | 900 | vp->v_mount = NULL; |
ef24f6dd KM |
901 | } |
902 | /* | |
903 | * If special device, remove it from special device alias list. | |
904 | */ | |
905 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
906 | if (*vp->v_hashchain == vp) { |
907 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 908 | } else { |
7f7b7d89 | 909 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 910 | if (vq->v_specnext != vp) |
ef24f6dd | 911 | continue; |
c0de8792 | 912 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
913 | break; |
914 | } | |
c0de8792 | 915 | if (vq == NULL) |
ef24f6dd KM |
916 | panic("missing bdev"); |
917 | } | |
c0de8792 | 918 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 919 | vx = NULL; |
7f7b7d89 | 920 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
921 | if (vq->v_rdev != vp->v_rdev || |
922 | vq->v_type != vp->v_type) | |
c0de8792 | 923 | continue; |
4d1ee2eb CT |
924 | if (vx) |
925 | break; | |
c0de8792 KM |
926 | vx = vq; |
927 | } | |
4d1ee2eb | 928 | if (vx == NULL) |
c0de8792 | 929 | panic("missing alias"); |
4d1ee2eb | 930 | if (vq == NULL) |
c0de8792 KM |
931 | vx->v_flag &= ~VALIASED; |
932 | vp->v_flag &= ~VALIASED; | |
933 | } | |
934 | FREE(vp->v_specinfo, M_VNODE); | |
935 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
936 | } |
937 | /* | |
3387ef89 KM |
938 | * If it is on the freelist and not already at the head, |
939 | * move it to the head of the list. | |
ef24f6dd | 940 | */ |
3387ef89 | 941 | if (vp->v_freeb && vfreeh != vp) { |
ef24f6dd KM |
942 | if (vq = vp->v_freef) |
943 | vq->v_freeb = vp->v_freeb; | |
944 | else | |
945 | vfreet = vp->v_freeb; | |
946 | *vp->v_freeb = vq; | |
947 | vp->v_freef = vfreeh; | |
948 | vp->v_freeb = &vfreeh; | |
949 | vfreeh->v_freeb = &vp->v_freef; | |
950 | vfreeh = vp; | |
951 | } | |
2bae1875 | 952 | vp->v_type = VBAD; |
36d09cb1 | 953 | } |
ef62830d | 954 | |
2bcd6066 KM |
955 | /* |
956 | * Lookup a vnode by device number. | |
957 | */ | |
958 | vfinddev(dev, type, vpp) | |
959 | dev_t dev; | |
960 | enum vtype type; | |
961 | struct vnode **vpp; | |
962 | { | |
963 | register struct vnode *vp; | |
964 | ||
965 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
966 | if (dev != vp->v_rdev || type != vp->v_type) | |
967 | continue; | |
968 | *vpp = vp; | |
05378ee4 | 969 | return (1); |
2bcd6066 | 970 | } |
05378ee4 | 971 | return (0); |
2bcd6066 KM |
972 | } |
973 | ||
ef62830d KM |
974 | /* |
975 | * Calculate the total number of references to a special device. | |
976 | */ | |
977 | vcount(vp) | |
978 | register struct vnode *vp; | |
979 | { | |
7f7b7d89 | 980 | register struct vnode *vq; |
ef62830d KM |
981 | int count; |
982 | ||
983 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 984 | return (vp->v_usecount); |
ef62830d | 985 | loop: |
7f7b7d89 | 986 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 987 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
988 | continue; |
989 | /* | |
990 | * Alias, but not in use, so flush it out. | |
991 | */ | |
7f7b7d89 | 992 | if (vq->v_usecount == 0) { |
ef62830d KM |
993 | vgone(vq); |
994 | goto loop; | |
995 | } | |
7f7b7d89 | 996 | count += vq->v_usecount; |
ef62830d KM |
997 | } |
998 | return (count); | |
999 | } | |
0bf84b18 KM |
1000 | |
1001 | /* | |
1002 | * Print out a description of a vnode. | |
1003 | */ | |
1004 | static char *typename[] = | |
61f846a8 | 1005 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1006 | |
1007 | vprint(label, vp) | |
1008 | char *label; | |
1009 | register struct vnode *vp; | |
1010 | { | |
f2f730c6 | 1011 | char buf[64]; |
0bf84b18 KM |
1012 | |
1013 | if (label != NULL) | |
1014 | printf("%s: ", label); | |
65c3b3a8 KM |
1015 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1016 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1017 | vp->v_holdcnt); | |
f2f730c6 KM |
1018 | buf[0] = '\0'; |
1019 | if (vp->v_flag & VROOT) | |
1020 | strcat(buf, "|VROOT"); | |
1021 | if (vp->v_flag & VTEXT) | |
1022 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1023 | if (vp->v_flag & VSYSTEM) |
1024 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1025 | if (vp->v_flag & VXLOCK) |
1026 | strcat(buf, "|VXLOCK"); | |
1027 | if (vp->v_flag & VXWANT) | |
1028 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1029 | if (vp->v_flag & VBWAIT) |
1030 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1031 | if (vp->v_flag & VALIASED) |
1032 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1033 | if (buf[0] != '\0') |
1034 | printf(" flags (%s)", &buf[1]); | |
1035 | printf("\n\t"); | |
0bf84b18 KM |
1036 | VOP_PRINT(vp); |
1037 | } | |
985cbdd5 | 1038 | |
34c62e18 KM |
1039 | #ifdef DEBUG |
1040 | /* | |
1041 | * List all of the locked vnodes in the system. | |
1042 | * Called when debugging the kernel. | |
1043 | */ | |
1044 | printlockedvnodes() | |
1045 | { | |
1046 | register struct mount *mp; | |
1047 | register struct vnode *vp; | |
1048 | ||
1049 | printf("Locked vnodes\n"); | |
1050 | mp = rootfs; | |
1051 | do { | |
1052 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1053 | if (VOP_ISLOCKED(vp)) | |
1054 | vprint((char *)0, vp); | |
1055 | mp = mp->mnt_next; | |
1056 | } while (mp != rootfs); | |
1057 | } | |
1058 | #endif | |
1059 | ||
985cbdd5 MT |
1060 | int kinfo_vdebug = 1; |
1061 | int kinfo_vgetfailed; | |
1062 | #define KINFO_VNODESLOP 10 | |
1063 | /* | |
786fb484 | 1064 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1065 | * Copyout address of vnode followed by vnode. |
1066 | */ | |
aacc1bff | 1067 | /* ARGSUSED */ |
786fb484 | 1068 | sysctl_vnode(where, sizep) |
985cbdd5 | 1069 | char *where; |
c1909da4 | 1070 | size_t *sizep; |
985cbdd5 MT |
1071 | { |
1072 | register struct mount *mp = rootfs; | |
36ef03ec | 1073 | struct mount *omp; |
985cbdd5 | 1074 | struct vnode *vp; |
985cbdd5 | 1075 | register char *bp = where, *savebp; |
5bf57294 | 1076 | char *ewhere; |
985cbdd5 MT |
1077 | int error; |
1078 | ||
1079 | #define VPTRSZ sizeof (struct vnode *) | |
1080 | #define VNODESZ sizeof (struct vnode) | |
1081 | if (where == NULL) { | |
786fb484 | 1082 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1083 | return (0); |
1084 | } | |
786fb484 | 1085 | ewhere = where + *sizep; |
985cbdd5 | 1086 | |
985cbdd5 | 1087 | do { |
36ef03ec | 1088 | if (vfs_busy(mp)) { |
54fb9dc2 | 1089 | mp = mp->mnt_next; |
36ef03ec KM |
1090 | continue; |
1091 | } | |
985cbdd5 MT |
1092 | savebp = bp; |
1093 | again: | |
4597dd33 | 1094 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1095 | /* |
1096 | * Check that the vp is still associated with | |
1097 | * this filesystem. RACE: could have been | |
1098 | * recycled onto the same filesystem. | |
1099 | */ | |
4597dd33 KM |
1100 | if (vp->v_mount != mp) { |
1101 | if (kinfo_vdebug) | |
1102 | printf("kinfo: vp changed\n"); | |
1103 | bp = savebp; | |
1104 | goto again; | |
1105 | } | |
786fb484 KM |
1106 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1107 | *sizep = bp - where; | |
1108 | return (ENOMEM); | |
1109 | } | |
1110 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1111 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1112 | return (error); |
985cbdd5 | 1113 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1114 | } |
36ef03ec | 1115 | omp = mp; |
54fb9dc2 | 1116 | mp = mp->mnt_next; |
36ef03ec | 1117 | vfs_unbusy(omp); |
985cbdd5 MT |
1118 | } while (mp != rootfs); |
1119 | ||
786fb484 | 1120 | *sizep = bp - where; |
985cbdd5 MT |
1121 | return (0); |
1122 | } |