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 | * |
05378ee4 | 7 | * @(#)vfs_subr.c 7.99 (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; |
fcba749b | 193 | vap->va_vaflags = 0; |
3c4390e8 | 194 | } |
c60798ca | 195 | |
36d09cb1 KM |
196 | /* |
197 | * Routines having to do with the management of the vnode table. | |
198 | */ | |
dc998e72 | 199 | struct vnode *vfreeh, **vfreet = &vfreeh; |
9342689a | 200 | extern int (**dead_vnodeop_p)(); |
32339c94 | 201 | extern void vclean(); |
1a80f56e | 202 | long numvnodes; |
e781da98 | 203 | extern struct vattr va_null; |
36d09cb1 | 204 | |
1f9d2249 | 205 | |
36d09cb1 KM |
206 | /* |
207 | * Return the next vnode from the free list. | |
208 | */ | |
209 | getnewvnode(tag, mp, vops, vpp) | |
210 | enum vtagtype tag; | |
211 | struct mount *mp; | |
cf74dd57 | 212 | int (**vops)(); |
36d09cb1 KM |
213 | struct vnode **vpp; |
214 | { | |
215 | register struct vnode *vp, *vq; | |
1f9d2249 | 216 | int s; |
36d09cb1 | 217 | |
ecf75a7d KM |
218 | if ((vfreeh == NULL && numvnodes < 2 * desiredvnodes) || |
219 | numvnodes < desiredvnodes) { | |
aacc1bff KM |
220 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
221 | M_VNODE, M_WAITOK); | |
1a80f56e KM |
222 | bzero((char *)vp, sizeof *vp); |
223 | numvnodes++; | |
224 | } else { | |
225 | if ((vp = vfreeh) == NULL) { | |
226 | tablefull("vnode"); | |
227 | *vpp = 0; | |
228 | return (ENFILE); | |
229 | } | |
230 | if (vp->v_usecount) | |
231 | panic("free vnode isn't"); | |
232 | if (vq = vp->v_freef) | |
233 | vq->v_freeb = &vfreeh; | |
234 | else | |
235 | vfreet = &vfreeh; | |
236 | vfreeh = vq; | |
237 | vp->v_freef = NULL; | |
238 | vp->v_freeb = NULL; | |
39b99eb6 | 239 | vp->v_lease = NULL; |
1a80f56e KM |
240 | if (vp->v_type != VBAD) |
241 | vgone(vp); | |
1f9d2249 | 242 | #ifdef DIAGNOSTIC |
2345b093 KM |
243 | if (vp->v_data) |
244 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
245 | s = splbio(); |
246 | if (vp->v_numoutput) | |
247 | panic("Clean vnode has pending I/O's"); | |
248 | splx(s); | |
249 | #endif | |
1a80f56e | 250 | vp->v_flag = 0; |
1a80f56e | 251 | vp->v_lastr = 0; |
1f9d2249 MS |
252 | vp->v_lastw = 0; |
253 | vp->v_lasta = 0; | |
254 | vp->v_cstart = 0; | |
255 | vp->v_clen = 0; | |
1a80f56e | 256 | vp->v_socket = 0; |
36d09cb1 | 257 | } |
1f9d2249 | 258 | vp->v_ralen = 1; |
b027498b | 259 | vp->v_type = VNON; |
36d09cb1 KM |
260 | cache_purge(vp); |
261 | vp->v_tag = tag; | |
ef24f6dd | 262 | vp->v_op = vops; |
36d09cb1 | 263 | insmntque(vp, mp); |
ec04fc59 | 264 | vp->v_usecount++; |
36d09cb1 KM |
265 | *vpp = vp; |
266 | return (0); | |
267 | } | |
36d09cb1 KM |
268 | /* |
269 | * Move a vnode from one mount queue to another. | |
270 | */ | |
271 | insmntque(vp, mp) | |
272 | register struct vnode *vp; | |
273 | register struct mount *mp; | |
274 | { | |
8136adfc | 275 | register struct vnode *vq; |
36d09cb1 KM |
276 | |
277 | /* | |
278 | * Delete from old mount point vnode list, if on one. | |
279 | */ | |
280 | if (vp->v_mountb) { | |
281 | if (vq = vp->v_mountf) | |
282 | vq->v_mountb = vp->v_mountb; | |
283 | *vp->v_mountb = vq; | |
284 | } | |
285 | /* | |
286 | * Insert into list of vnodes for the new mount point, if available. | |
287 | */ | |
a45ff315 | 288 | vp->v_mount = mp; |
36d09cb1 KM |
289 | if (mp == NULL) { |
290 | vp->v_mountf = NULL; | |
291 | vp->v_mountb = NULL; | |
292 | return; | |
293 | } | |
8136adfc KM |
294 | if (vq = mp->mnt_mounth) |
295 | vq->v_mountb = &vp->v_mountf; | |
296 | vp->v_mountf = vq; | |
297 | vp->v_mountb = &mp->mnt_mounth; | |
298 | mp->mnt_mounth = vp; | |
36d09cb1 KM |
299 | } |
300 | ||
76429560 KM |
301 | /* |
302 | * Update outstanding I/O count and do wakeup if requested. | |
303 | */ | |
304 | vwakeup(bp) | |
305 | register struct buf *bp; | |
306 | { | |
307 | register struct vnode *vp; | |
308 | ||
a9338fad | 309 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
310 | if (vp = bp->b_vp) { |
311 | vp->v_numoutput--; | |
1f9d2249 MS |
312 | if (vp->v_numoutput < 0) |
313 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
314 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
315 | if (vp->v_numoutput < 0) | |
316 | panic("vwakeup: neg numoutput"); | |
317 | vp->v_flag &= ~VBWAIT; | |
318 | wakeup((caddr_t)&vp->v_numoutput); | |
319 | } | |
320 | } | |
321 | } | |
322 | ||
76429560 KM |
323 | /* |
324 | * Flush out and invalidate all buffers associated with a vnode. | |
325 | * Called with the underlying object locked. | |
326 | */ | |
d024c2ce | 327 | int |
c33e9e8b | 328 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 329 | register struct vnode *vp; |
12079a9d | 330 | int flags; |
d024c2ce KM |
331 | struct ucred *cred; |
332 | struct proc *p; | |
c33e9e8b | 333 | int slpflag, slptimeo; |
76429560 KM |
334 | { |
335 | register struct buf *bp; | |
336 | struct buf *nbp, *blist; | |
d024c2ce | 337 | int s, error; |
76429560 | 338 | |
12079a9d | 339 | if (flags & V_SAVE) { |
d024c2ce KM |
340 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
341 | return (error); | |
e3249ec0 | 342 | if (vp->v_dirtyblkhd.le_next != NULL) |
d024c2ce KM |
343 | panic("vinvalbuf: dirty bufs"); |
344 | } | |
76429560 | 345 | for (;;) { |
e3249ec0 | 346 | if ((blist = vp->v_cleanblkhd.le_next) && flags & V_SAVEMETA) |
12079a9d | 347 | while (blist && blist->b_lblkno < 0) |
e3249ec0 KM |
348 | blist = blist->b_vnbufs.qe_next; |
349 | if (!blist && (blist = vp->v_dirtyblkhd.le_next) && | |
350 | (flags & V_SAVEMETA)) | |
12079a9d | 351 | while (blist && blist->b_lblkno < 0) |
e3249ec0 | 352 | blist = blist->b_vnbufs.qe_next; |
12079a9d | 353 | if (!blist) |
76429560 | 354 | break; |
12079a9d | 355 | |
76429560 | 356 | for (bp = blist; bp; bp = nbp) { |
e3249ec0 | 357 | nbp = bp->b_vnbufs.qe_next; |
12079a9d MS |
358 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
359 | continue; | |
76429560 KM |
360 | s = splbio(); |
361 | if (bp->b_flags & B_BUSY) { | |
362 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
363 | error = tsleep((caddr_t)bp, |
364 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
365 | slptimeo); | |
76429560 | 366 | splx(s); |
c33e9e8b KM |
367 | if (error) |
368 | return (error); | |
76429560 KM |
369 | break; |
370 | } | |
371 | bremfree(bp); | |
372 | bp->b_flags |= B_BUSY; | |
373 | splx(s); | |
c33e9e8b KM |
374 | /* |
375 | * XXX Since there are no node locks for NFS, I believe | |
376 | * there is a slight chance that a delayed write will | |
377 | * occur while sleeping just above, so check for it. | |
378 | */ | |
379 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
380 | (void) VOP_BWRITE(bp); | |
381 | break; | |
382 | } | |
12079a9d | 383 | bp->b_flags |= B_INVAL; |
76429560 KM |
384 | brelse(bp); |
385 | } | |
386 | } | |
e3249ec0 KM |
387 | if (!(flags & V_SAVEMETA) && |
388 | (vp->v_dirtyblkhd.le_next || vp->v_cleanblkhd.le_next)) | |
76429560 | 389 | panic("vinvalbuf: flush failed"); |
d024c2ce | 390 | return (0); |
76429560 KM |
391 | } |
392 | ||
393 | /* | |
394 | * Associate a buffer with a vnode. | |
395 | */ | |
396 | bgetvp(vp, bp) | |
397 | register struct vnode *vp; | |
398 | register struct buf *bp; | |
399 | { | |
8136adfc | 400 | register struct vnode *vq; |
76429560 KM |
401 | |
402 | if (bp->b_vp) | |
403 | panic("bgetvp: not free"); | |
404 | VHOLD(vp); | |
405 | bp->b_vp = vp; | |
406 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
407 | bp->b_dev = vp->v_rdev; | |
408 | else | |
409 | bp->b_dev = NODEV; | |
410 | /* | |
411 | * Insert onto list for new vnode. | |
412 | */ | |
e3249ec0 | 413 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
414 | } |
415 | ||
416 | /* | |
417 | * Disassociate a buffer from a vnode. | |
418 | */ | |
419 | brelvp(bp) | |
420 | register struct buf *bp; | |
421 | { | |
76429560 KM |
422 | struct vnode *vp; |
423 | ||
424 | if (bp->b_vp == (struct vnode *) 0) | |
425 | panic("brelvp: NULL"); | |
426 | /* | |
427 | * Delete from old vnode list, if on one. | |
428 | */ | |
e3249ec0 KM |
429 | if (bp->b_vnbufs.qe_next != NOLIST) |
430 | bufremvn(bp); | |
76429560 KM |
431 | vp = bp->b_vp; |
432 | bp->b_vp = (struct vnode *) 0; | |
433 | HOLDRELE(vp); | |
434 | } | |
435 | ||
436 | /* | |
437 | * Reassign a buffer from one vnode to another. | |
438 | * Used to assign file specific control information | |
439 | * (indirect blocks) to the vnode to which they belong. | |
440 | */ | |
441 | reassignbuf(bp, newvp) | |
442 | register struct buf *bp; | |
443 | register struct vnode *newvp; | |
444 | { | |
e3249ec0 | 445 | register struct list_entry *listheadp; |
76429560 | 446 | |
e5c3f16e KM |
447 | if (newvp == NULL) { |
448 | printf("reassignbuf: NULL"); | |
449 | return; | |
450 | } | |
76429560 KM |
451 | /* |
452 | * Delete from old vnode list, if on one. | |
453 | */ | |
e3249ec0 KM |
454 | if (bp->b_vnbufs.qe_next != NOLIST) |
455 | bufremvn(bp); | |
76429560 KM |
456 | /* |
457 | * If dirty, put on list of dirty buffers; | |
458 | * otherwise insert onto list of clean buffers. | |
459 | */ | |
460 | if (bp->b_flags & B_DELWRI) | |
461 | listheadp = &newvp->v_dirtyblkhd; | |
462 | else | |
463 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 464 | bufinsvn(bp, listheadp); |
76429560 KM |
465 | } |
466 | ||
36d09cb1 | 467 | /* |
ef24f6dd KM |
468 | * Create a vnode for a block device. |
469 | * Used for root filesystem, argdev, and swap areas. | |
470 | * Also used for memory file system special devices. | |
471 | */ | |
472 | bdevvp(dev, vpp) | |
473 | dev_t dev; | |
474 | struct vnode **vpp; | |
475 | { | |
ef24f6dd KM |
476 | register struct vnode *vp; |
477 | struct vnode *nvp; | |
478 | int error; | |
479 | ||
1c89915d KM |
480 | if (dev == NODEV) |
481 | return (0); | |
9342689a | 482 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
483 | if (error) { |
484 | *vpp = 0; | |
485 | return (error); | |
486 | } | |
487 | vp = nvp; | |
488 | vp->v_type = VBLK; | |
c0de8792 | 489 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
490 | vput(vp); |
491 | vp = nvp; | |
492 | } | |
493 | *vpp = vp; | |
494 | return (0); | |
495 | } | |
496 | ||
497 | /* | |
498 | * Check to see if the new vnode represents a special device | |
499 | * for which we already have a vnode (either because of | |
500 | * bdevvp() or because of a different vnode representing | |
501 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 502 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
503 | * caller is responsible for filling it with its new contents. |
504 | */ | |
505 | struct vnode * | |
c0de8792 | 506 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 507 | register struct vnode *nvp; |
c0de8792 | 508 | dev_t nvp_rdev; |
ef24f6dd KM |
509 | struct mount *mp; |
510 | { | |
511 | register struct vnode *vp; | |
c0de8792 | 512 | struct vnode **vpp; |
ef24f6dd KM |
513 | |
514 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 515 | return (NULLVP); |
c0de8792 KM |
516 | |
517 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 518 | loop: |
c0de8792 KM |
519 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
520 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 521 | continue; |
c0de8792 KM |
522 | /* |
523 | * Alias, but not in use, so flush it out. | |
524 | */ | |
7f7b7d89 | 525 | if (vp->v_usecount == 0) { |
c0de8792 KM |
526 | vgone(vp); |
527 | goto loop; | |
528 | } | |
ef62830d KM |
529 | if (vget(vp)) |
530 | goto loop; | |
ef24f6dd KM |
531 | break; |
532 | } | |
c0de8792 | 533 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
534 | MALLOC(nvp->v_specinfo, struct specinfo *, |
535 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
536 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 537 | nvp->v_hashchain = vpp; |
c0de8792 | 538 | nvp->v_specnext = *vpp; |
2c957a90 | 539 | nvp->v_specflags = 0; |
c0de8792 | 540 | *vpp = nvp; |
40452d5e KM |
541 | if (vp != NULL) { |
542 | nvp->v_flag |= VALIASED; | |
543 | vp->v_flag |= VALIASED; | |
544 | vput(vp); | |
545 | } | |
54fb9dc2 | 546 | return (NULLVP); |
ef24f6dd | 547 | } |
2bae1875 KM |
548 | VOP_UNLOCK(vp); |
549 | vclean(vp, 0); | |
ef24f6dd KM |
550 | vp->v_op = nvp->v_op; |
551 | vp->v_tag = nvp->v_tag; | |
552 | nvp->v_type = VNON; | |
553 | insmntque(vp, mp); | |
554 | return (vp); | |
555 | } | |
556 | ||
557 | /* | |
558 | * Grab a particular vnode from the free list, increment its | |
559 | * reference count and lock it. The vnode lock bit is set the | |
560 | * vnode is being eliminated in vgone. The process is awakened | |
561 | * when the transition is completed, and an error returned to | |
562 | * indicate that the vnode is no longer usable (possibly having | |
563 | * been changed to a new file system type). | |
36d09cb1 KM |
564 | */ |
565 | vget(vp) | |
566 | register struct vnode *vp; | |
567 | { | |
568 | register struct vnode *vq; | |
569 | ||
ef24f6dd KM |
570 | if (vp->v_flag & VXLOCK) { |
571 | vp->v_flag |= VXWANT; | |
572 | sleep((caddr_t)vp, PINOD); | |
573 | return (1); | |
574 | } | |
7f7b7d89 | 575 | if (vp->v_usecount == 0) { |
ef24f6dd KM |
576 | if (vq = vp->v_freef) |
577 | vq->v_freeb = vp->v_freeb; | |
578 | else | |
579 | vfreet = vp->v_freeb; | |
580 | *vp->v_freeb = vq; | |
581 | vp->v_freef = NULL; | |
582 | vp->v_freeb = NULL; | |
583 | } | |
ec04fc59 | 584 | vp->v_usecount++; |
ef24f6dd KM |
585 | VOP_LOCK(vp); |
586 | return (0); | |
36d09cb1 KM |
587 | } |
588 | ||
d32390ea KM |
589 | int bug_refs = 0; |
590 | ||
36d09cb1 KM |
591 | /* |
592 | * Vnode reference, just increment the count | |
593 | */ | |
594 | void vref(vp) | |
595 | struct vnode *vp; | |
596 | { | |
597 | ||
ec04fc59 KM |
598 | if (vp->v_usecount <= 0) |
599 | panic("vref used where vget required"); | |
7f7b7d89 | 600 | vp->v_usecount++; |
d32390ea KM |
601 | if (vp->v_type != VBLK && curproc) |
602 | curproc->p_spare[0]++; | |
603 | if (bug_refs) | |
604 | vprint("vref: "); | |
36d09cb1 KM |
605 | } |
606 | ||
607 | /* | |
608 | * vput(), just unlock and vrele() | |
609 | */ | |
610 | void vput(vp) | |
611 | register struct vnode *vp; | |
612 | { | |
4d1ee2eb | 613 | |
36d09cb1 KM |
614 | VOP_UNLOCK(vp); |
615 | vrele(vp); | |
616 | } | |
617 | ||
618 | /* | |
619 | * Vnode release. | |
620 | * If count drops to zero, call inactive routine and return to freelist. | |
621 | */ | |
622 | void vrele(vp) | |
623 | register struct vnode *vp; | |
624 | { | |
625 | ||
65c3b3a8 | 626 | #ifdef DIAGNOSTIC |
36d09cb1 | 627 | if (vp == NULL) |
ef24f6dd | 628 | panic("vrele: null vp"); |
65c3b3a8 | 629 | #endif |
7f7b7d89 | 630 | vp->v_usecount--; |
d32390ea KM |
631 | if (vp->v_type != VBLK && curproc) |
632 | curproc->p_spare[0]--; | |
633 | if (bug_refs) | |
634 | vprint("vref: "); | |
7f7b7d89 | 635 | if (vp->v_usecount > 0) |
36d09cb1 | 636 | return; |
65c3b3a8 KM |
637 | #ifdef DIAGNOSTIC |
638 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
639 | vprint("vrele: bad ref count", vp); | |
640 | panic("vrele: ref cnt"); | |
641 | } | |
642 | #endif | |
dc998e72 KM |
643 | /* |
644 | * insert at tail of LRU list | |
645 | */ | |
646 | *vfreet = vp; | |
647 | vp->v_freeb = vfreet; | |
ef24f6dd KM |
648 | vp->v_freef = NULL; |
649 | vfreet = &vp->v_freef; | |
d024c2ce | 650 | VOP_INACTIVE(vp); |
ef24f6dd KM |
651 | } |
652 | ||
7f7b7d89 KM |
653 | /* |
654 | * Page or buffer structure gets a reference. | |
655 | */ | |
451df175 | 656 | void vhold(vp) |
7f7b7d89 KM |
657 | register struct vnode *vp; |
658 | { | |
659 | ||
660 | vp->v_holdcnt++; | |
661 | } | |
662 | ||
663 | /* | |
664 | * Page or buffer structure frees a reference. | |
665 | */ | |
451df175 | 666 | void holdrele(vp) |
7f7b7d89 KM |
667 | register struct vnode *vp; |
668 | { | |
669 | ||
670 | if (vp->v_holdcnt <= 0) | |
671 | panic("holdrele: holdcnt"); | |
672 | vp->v_holdcnt--; | |
673 | } | |
674 | ||
f0556f86 KM |
675 | /* |
676 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
677 | * | |
678 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
679 | * return error if any are found (nb: this is a user error, not a | |
680 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
681 | * that are found. | |
682 | */ | |
683 | int busyprt = 0; /* patch to print out busy vnodes */ | |
684 | ||
685 | vflush(mp, skipvp, flags) | |
686 | struct mount *mp; | |
687 | struct vnode *skipvp; | |
688 | int flags; | |
689 | { | |
690 | register struct vnode *vp, *nvp; | |
691 | int busy = 0; | |
692 | ||
54fb9dc2 | 693 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 694 | panic("vflush: not busy"); |
4597dd33 | 695 | loop: |
54fb9dc2 | 696 | for (vp = mp->mnt_mounth; vp; vp = nvp) { |
4597dd33 KM |
697 | if (vp->v_mount != mp) |
698 | goto loop; | |
f0556f86 KM |
699 | nvp = vp->v_mountf; |
700 | /* | |
701 | * Skip over a selected vnode. | |
f0556f86 KM |
702 | */ |
703 | if (vp == skipvp) | |
704 | continue; | |
36ef03ec KM |
705 | /* |
706 | * Skip over a vnodes marked VSYSTEM. | |
707 | */ | |
708 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
709 | continue; | |
da374605 KM |
710 | /* |
711 | * If WRITECLOSE is set, only flush out regular file | |
712 | * vnodes open for writing. | |
713 | */ | |
714 | if ((flags & WRITECLOSE) && | |
715 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
716 | continue; | |
f0556f86 | 717 | /* |
7f7b7d89 | 718 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
719 | * out the vnode data structures and we are done. |
720 | */ | |
7f7b7d89 | 721 | if (vp->v_usecount == 0) { |
f0556f86 KM |
722 | vgone(vp); |
723 | continue; | |
724 | } | |
725 | /* | |
da374605 | 726 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
727 | * For block or character devices, revert to an |
728 | * anonymous device. For all other files, just kill them. | |
729 | */ | |
36ef03ec | 730 | if (flags & FORCECLOSE) { |
f0556f86 KM |
731 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
732 | vgone(vp); | |
733 | } else { | |
734 | vclean(vp, 0); | |
9342689a | 735 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
736 | insmntque(vp, (struct mount *)0); |
737 | } | |
738 | continue; | |
739 | } | |
740 | if (busyprt) | |
0bf84b18 | 741 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
742 | busy++; |
743 | } | |
744 | if (busy) | |
745 | return (EBUSY); | |
746 | return (0); | |
747 | } | |
748 | ||
ef24f6dd KM |
749 | /* |
750 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 751 | */ |
ecf75a7d KM |
752 | void |
753 | vclean(vp, flags) | |
ef24f6dd | 754 | register struct vnode *vp; |
aacc1bff | 755 | int flags; |
ef24f6dd | 756 | { |
2bae1875 | 757 | int active; |
ef24f6dd | 758 | |
2bae1875 KM |
759 | /* |
760 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
761 | * If so we have to reference it before we clean it out |
762 | * so that its count cannot fall to zero and generate a | |
763 | * race against ourselves to recycle it. | |
2bae1875 | 764 | */ |
7f7b7d89 | 765 | if (active = vp->v_usecount) |
2bae1875 | 766 | VREF(vp); |
669df1aa KM |
767 | /* |
768 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
769 | * have the object locked while it cleans it out. The VOP_LOCK | |
770 | * ensures that the VOP_INACTIVE routine is done with its work. | |
771 | * For active vnodes, it ensures that no other activity can | |
772 | * occur while the underlying object is being cleaned out. | |
773 | */ | |
774 | VOP_LOCK(vp); | |
2bae1875 KM |
775 | /* |
776 | * Prevent the vnode from being recycled or | |
777 | * brought into use while we clean it out. | |
778 | */ | |
0bf84b18 KM |
779 | if (vp->v_flag & VXLOCK) |
780 | panic("vclean: deadlock"); | |
ef24f6dd | 781 | vp->v_flag |= VXLOCK; |
0bf84b18 | 782 | /* |
669df1aa | 783 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 784 | */ |
36ef03ec | 785 | if (flags & DOCLOSE) |
c33e9e8b | 786 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 787 | /* |
669df1aa KM |
788 | * Any other processes trying to obtain this lock must first |
789 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 790 | */ |
669df1aa | 791 | VOP_UNLOCK(vp); |
ef24f6dd | 792 | /* |
669df1aa KM |
793 | * If purging an active vnode, it must be closed and |
794 | * deactivated before being reclaimed. | |
ef24f6dd | 795 | */ |
2bae1875 | 796 | if (active) { |
669df1aa KM |
797 | if (flags & DOCLOSE) |
798 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
799 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
800 | } |
801 | /* | |
802 | * Reclaim the vnode. | |
803 | */ | |
669df1aa | 804 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 805 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
806 | if (active) |
807 | vrele(vp); | |
38c46eee | 808 | |
ef24f6dd | 809 | /* |
669df1aa | 810 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 811 | */ |
669df1aa KM |
812 | vp->v_op = dead_vnodeop_p; |
813 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
814 | vp->v_flag &= ~VXLOCK; |
815 | if (vp->v_flag & VXWANT) { | |
816 | vp->v_flag &= ~VXWANT; | |
817 | wakeup((caddr_t)vp); | |
818 | } | |
819 | } | |
820 | ||
ef62830d KM |
821 | /* |
822 | * Eliminate all activity associated with the requested vnode | |
823 | * and with all vnodes aliased to the requested vnode. | |
824 | */ | |
825 | void vgoneall(vp) | |
826 | register struct vnode *vp; | |
827 | { | |
7f7b7d89 | 828 | register struct vnode *vq; |
ef62830d | 829 | |
7a7b3a95 KM |
830 | if (vp->v_flag & VALIASED) { |
831 | /* | |
832 | * If a vgone (or vclean) is already in progress, | |
833 | * wait until it is done and return. | |
834 | */ | |
835 | if (vp->v_flag & VXLOCK) { | |
836 | vp->v_flag |= VXWANT; | |
837 | sleep((caddr_t)vp, PINOD); | |
838 | return; | |
839 | } | |
840 | /* | |
841 | * Ensure that vp will not be vgone'd while we | |
842 | * are eliminating its aliases. | |
843 | */ | |
844 | vp->v_flag |= VXLOCK; | |
845 | while (vp->v_flag & VALIASED) { | |
846 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
847 | if (vq->v_rdev != vp->v_rdev || | |
848 | vq->v_type != vp->v_type || vp == vq) | |
849 | continue; | |
850 | vgone(vq); | |
851 | break; | |
852 | } | |
ef62830d | 853 | } |
7a7b3a95 KM |
854 | /* |
855 | * Remove the lock so that vgone below will | |
856 | * really eliminate the vnode after which time | |
857 | * vgone will awaken any sleepers. | |
858 | */ | |
859 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
860 | } |
861 | vgone(vp); | |
862 | } | |
863 | ||
ef24f6dd KM |
864 | /* |
865 | * Eliminate all activity associated with a vnode | |
866 | * in preparation for reuse. | |
867 | */ | |
868 | void vgone(vp) | |
869 | register struct vnode *vp; | |
870 | { | |
7f7b7d89 | 871 | register struct vnode *vq; |
c0de8792 | 872 | struct vnode *vx; |
ef24f6dd | 873 | |
4f55e3ec KM |
874 | /* |
875 | * If a vgone (or vclean) is already in progress, | |
876 | * wait until it is done and return. | |
877 | */ | |
878 | if (vp->v_flag & VXLOCK) { | |
879 | vp->v_flag |= VXWANT; | |
880 | sleep((caddr_t)vp, PINOD); | |
881 | return; | |
882 | } | |
ef24f6dd KM |
883 | /* |
884 | * Clean out the filesystem specific data. | |
885 | */ | |
36ef03ec | 886 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
887 | /* |
888 | * Delete from old mount point vnode list, if on one. | |
889 | */ | |
890 | if (vp->v_mountb) { | |
891 | if (vq = vp->v_mountf) | |
892 | vq->v_mountb = vp->v_mountb; | |
893 | *vp->v_mountb = vq; | |
894 | vp->v_mountf = NULL; | |
895 | vp->v_mountb = NULL; | |
d10e9258 | 896 | vp->v_mount = NULL; |
ef24f6dd KM |
897 | } |
898 | /* | |
899 | * If special device, remove it from special device alias list. | |
900 | */ | |
901 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
902 | if (*vp->v_hashchain == vp) { |
903 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 904 | } else { |
7f7b7d89 | 905 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 906 | if (vq->v_specnext != vp) |
ef24f6dd | 907 | continue; |
c0de8792 | 908 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
909 | break; |
910 | } | |
c0de8792 | 911 | if (vq == NULL) |
ef24f6dd KM |
912 | panic("missing bdev"); |
913 | } | |
c0de8792 | 914 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 915 | vx = NULL; |
7f7b7d89 | 916 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
917 | if (vq->v_rdev != vp->v_rdev || |
918 | vq->v_type != vp->v_type) | |
c0de8792 | 919 | continue; |
4d1ee2eb CT |
920 | if (vx) |
921 | break; | |
c0de8792 KM |
922 | vx = vq; |
923 | } | |
4d1ee2eb | 924 | if (vx == NULL) |
c0de8792 | 925 | panic("missing alias"); |
4d1ee2eb | 926 | if (vq == NULL) |
c0de8792 KM |
927 | vx->v_flag &= ~VALIASED; |
928 | vp->v_flag &= ~VALIASED; | |
929 | } | |
930 | FREE(vp->v_specinfo, M_VNODE); | |
931 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
932 | } |
933 | /* | |
3387ef89 KM |
934 | * If it is on the freelist and not already at the head, |
935 | * move it to the head of the list. | |
ef24f6dd | 936 | */ |
3387ef89 | 937 | if (vp->v_freeb && vfreeh != vp) { |
ef24f6dd KM |
938 | if (vq = vp->v_freef) |
939 | vq->v_freeb = vp->v_freeb; | |
940 | else | |
941 | vfreet = vp->v_freeb; | |
942 | *vp->v_freeb = vq; | |
943 | vp->v_freef = vfreeh; | |
944 | vp->v_freeb = &vfreeh; | |
945 | vfreeh->v_freeb = &vp->v_freef; | |
946 | vfreeh = vp; | |
947 | } | |
2bae1875 | 948 | vp->v_type = VBAD; |
36d09cb1 | 949 | } |
ef62830d | 950 | |
2bcd6066 KM |
951 | /* |
952 | * Lookup a vnode by device number. | |
953 | */ | |
954 | vfinddev(dev, type, vpp) | |
955 | dev_t dev; | |
956 | enum vtype type; | |
957 | struct vnode **vpp; | |
958 | { | |
959 | register struct vnode *vp; | |
960 | ||
961 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
962 | if (dev != vp->v_rdev || type != vp->v_type) | |
963 | continue; | |
964 | *vpp = vp; | |
05378ee4 | 965 | return (1); |
2bcd6066 | 966 | } |
05378ee4 | 967 | return (0); |
2bcd6066 KM |
968 | } |
969 | ||
ef62830d KM |
970 | /* |
971 | * Calculate the total number of references to a special device. | |
972 | */ | |
973 | vcount(vp) | |
974 | register struct vnode *vp; | |
975 | { | |
7f7b7d89 | 976 | register struct vnode *vq; |
ef62830d KM |
977 | int count; |
978 | ||
979 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 980 | return (vp->v_usecount); |
ef62830d | 981 | loop: |
7f7b7d89 | 982 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 983 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
984 | continue; |
985 | /* | |
986 | * Alias, but not in use, so flush it out. | |
987 | */ | |
7f7b7d89 | 988 | if (vq->v_usecount == 0) { |
ef62830d KM |
989 | vgone(vq); |
990 | goto loop; | |
991 | } | |
7f7b7d89 | 992 | count += vq->v_usecount; |
ef62830d KM |
993 | } |
994 | return (count); | |
995 | } | |
0bf84b18 KM |
996 | |
997 | /* | |
998 | * Print out a description of a vnode. | |
999 | */ | |
1000 | static char *typename[] = | |
61f846a8 | 1001 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1002 | |
1003 | vprint(label, vp) | |
1004 | char *label; | |
1005 | register struct vnode *vp; | |
1006 | { | |
f2f730c6 | 1007 | char buf[64]; |
0bf84b18 KM |
1008 | |
1009 | if (label != NULL) | |
1010 | printf("%s: ", label); | |
65c3b3a8 KM |
1011 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1012 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1013 | vp->v_holdcnt); | |
f2f730c6 KM |
1014 | buf[0] = '\0'; |
1015 | if (vp->v_flag & VROOT) | |
1016 | strcat(buf, "|VROOT"); | |
1017 | if (vp->v_flag & VTEXT) | |
1018 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1019 | if (vp->v_flag & VSYSTEM) |
1020 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1021 | if (vp->v_flag & VXLOCK) |
1022 | strcat(buf, "|VXLOCK"); | |
1023 | if (vp->v_flag & VXWANT) | |
1024 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1025 | if (vp->v_flag & VBWAIT) |
1026 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1027 | if (vp->v_flag & VALIASED) |
1028 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1029 | if (buf[0] != '\0') |
1030 | printf(" flags (%s)", &buf[1]); | |
1031 | printf("\n\t"); | |
0bf84b18 KM |
1032 | VOP_PRINT(vp); |
1033 | } | |
985cbdd5 | 1034 | |
34c62e18 KM |
1035 | #ifdef DEBUG |
1036 | /* | |
1037 | * List all of the locked vnodes in the system. | |
1038 | * Called when debugging the kernel. | |
1039 | */ | |
1040 | printlockedvnodes() | |
1041 | { | |
1042 | register struct mount *mp; | |
1043 | register struct vnode *vp; | |
1044 | ||
1045 | printf("Locked vnodes\n"); | |
1046 | mp = rootfs; | |
1047 | do { | |
1048 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) | |
1049 | if (VOP_ISLOCKED(vp)) | |
1050 | vprint((char *)0, vp); | |
1051 | mp = mp->mnt_next; | |
1052 | } while (mp != rootfs); | |
1053 | } | |
1054 | #endif | |
1055 | ||
985cbdd5 MT |
1056 | int kinfo_vdebug = 1; |
1057 | int kinfo_vgetfailed; | |
1058 | #define KINFO_VNODESLOP 10 | |
1059 | /* | |
786fb484 | 1060 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1061 | * Copyout address of vnode followed by vnode. |
1062 | */ | |
aacc1bff | 1063 | /* ARGSUSED */ |
786fb484 | 1064 | sysctl_vnode(where, sizep) |
985cbdd5 | 1065 | char *where; |
c1909da4 | 1066 | size_t *sizep; |
985cbdd5 MT |
1067 | { |
1068 | register struct mount *mp = rootfs; | |
36ef03ec | 1069 | struct mount *omp; |
985cbdd5 | 1070 | struct vnode *vp; |
985cbdd5 | 1071 | register char *bp = where, *savebp; |
5bf57294 | 1072 | char *ewhere; |
985cbdd5 MT |
1073 | int error; |
1074 | ||
1075 | #define VPTRSZ sizeof (struct vnode *) | |
1076 | #define VNODESZ sizeof (struct vnode) | |
1077 | if (where == NULL) { | |
786fb484 | 1078 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1079 | return (0); |
1080 | } | |
786fb484 | 1081 | ewhere = where + *sizep; |
985cbdd5 | 1082 | |
985cbdd5 | 1083 | do { |
36ef03ec | 1084 | if (vfs_busy(mp)) { |
54fb9dc2 | 1085 | mp = mp->mnt_next; |
36ef03ec KM |
1086 | continue; |
1087 | } | |
985cbdd5 MT |
1088 | savebp = bp; |
1089 | again: | |
4597dd33 | 1090 | for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) { |
41185b3b KM |
1091 | /* |
1092 | * Check that the vp is still associated with | |
1093 | * this filesystem. RACE: could have been | |
1094 | * recycled onto the same filesystem. | |
1095 | */ | |
4597dd33 KM |
1096 | if (vp->v_mount != mp) { |
1097 | if (kinfo_vdebug) | |
1098 | printf("kinfo: vp changed\n"); | |
1099 | bp = savebp; | |
1100 | goto again; | |
1101 | } | |
786fb484 KM |
1102 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1103 | *sizep = bp - where; | |
1104 | return (ENOMEM); | |
1105 | } | |
1106 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1107 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1108 | return (error); |
985cbdd5 | 1109 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1110 | } |
36ef03ec | 1111 | omp = mp; |
54fb9dc2 | 1112 | mp = mp->mnt_next; |
36ef03ec | 1113 | vfs_unbusy(omp); |
985cbdd5 MT |
1114 | } while (mp != rootfs); |
1115 | ||
786fb484 | 1116 | *sizep = bp - where; |
985cbdd5 MT |
1117 | return (0); |
1118 | } |