Commit | Line | Data |
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3c4390e8 | 1 | /* |
ec54f0cc KB |
2 | * Copyright (c) 1989, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
3c4390e8 | 4 | * |
dbf0c423 | 5 | * %sccs.include.redist.c% |
3c4390e8 | 6 | * |
3fc2ac18 | 7 | * @(#)vfs_subr.c 8.2 (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 | */ | |
3fc2ac18 KM |
44 | #define NOLIST ((struct buf *)0x87654321) |
45 | #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) | |
46 | #define bufremvn(bp) { \ | |
47 | LIST_REMOVE(bp, b_vnbufs); \ | |
48 | (bp)->b_vnbufs.le_next = NOLIST; \ | |
49 | } | |
50 | ||
51 | TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ | |
52 | struct mntlist mountlist; /* mounted filesystem list */ | |
e3249ec0 | 53 | |
3c4390e8 | 54 | /* |
3fc2ac18 | 55 | * Initialize the vnode management data structures. |
3c4390e8 | 56 | */ |
3fc2ac18 | 57 | vntblinit() |
3c4390e8 KM |
58 | { |
59 | ||
3fc2ac18 KM |
60 | TAILQ_INIT(&vnode_free_list); |
61 | TAILQ_INIT(&mountlist); | |
3c4390e8 KM |
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 | ||
3fc2ac18 | 142 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
54fb9dc2 | 143 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
3fc2ac18 | 144 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) |
d713f801 | 145 | return (mp); |
3fc2ac18 | 146 | } |
d713f801 | 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; | |
3fc2ac18 | 168 | if (mountlist.tqh_first != NULL) { |
17fd1cc7 JSP |
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 | */ | |
9342689a | 199 | extern int (**dead_vnodeop_p)(); |
32339c94 | 200 | extern void vclean(); |
1a80f56e | 201 | long numvnodes; |
e781da98 | 202 | extern struct vattr va_null; |
36d09cb1 KM |
203 | |
204 | /* | |
205 | * Return the next vnode from the free list. | |
206 | */ | |
207 | getnewvnode(tag, mp, vops, vpp) | |
208 | enum vtagtype tag; | |
209 | struct mount *mp; | |
cf74dd57 | 210 | int (**vops)(); |
36d09cb1 KM |
211 | struct vnode **vpp; |
212 | { | |
213 | register struct vnode *vp, *vq; | |
1f9d2249 | 214 | int s; |
36d09cb1 | 215 | |
3fc2ac18 KM |
216 | if ((vnode_free_list.tqh_first == NULL && |
217 | numvnodes < 2 * desiredvnodes) || | |
ecf75a7d | 218 | numvnodes < desiredvnodes) { |
aacc1bff KM |
219 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
220 | M_VNODE, M_WAITOK); | |
1a80f56e | 221 | bzero((char *)vp, sizeof *vp); |
3fc2ac18 | 222 | vp->v_usecount = 1; |
1a80f56e KM |
223 | numvnodes++; |
224 | } else { | |
3fc2ac18 | 225 | if ((vp = vnode_free_list.tqh_first) == NULL) { |
1a80f56e KM |
226 | tablefull("vnode"); |
227 | *vpp = 0; | |
228 | return (ENFILE); | |
229 | } | |
230 | if (vp->v_usecount) | |
231 | panic("free vnode isn't"); | |
3fc2ac18 KM |
232 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
233 | vp->v_usecount = 1; | |
39b99eb6 | 234 | vp->v_lease = NULL; |
1a80f56e KM |
235 | if (vp->v_type != VBAD) |
236 | vgone(vp); | |
1f9d2249 | 237 | #ifdef DIAGNOSTIC |
2345b093 KM |
238 | if (vp->v_data) |
239 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
240 | s = splbio(); |
241 | if (vp->v_numoutput) | |
242 | panic("Clean vnode has pending I/O's"); | |
243 | splx(s); | |
244 | #endif | |
1a80f56e | 245 | vp->v_flag = 0; |
1a80f56e | 246 | vp->v_lastr = 0; |
1f9d2249 MS |
247 | vp->v_lastw = 0; |
248 | vp->v_lasta = 0; | |
249 | vp->v_cstart = 0; | |
250 | vp->v_clen = 0; | |
1a80f56e | 251 | vp->v_socket = 0; |
36d09cb1 | 252 | } |
1f9d2249 | 253 | vp->v_ralen = 1; |
b027498b | 254 | vp->v_type = VNON; |
36d09cb1 KM |
255 | cache_purge(vp); |
256 | vp->v_tag = tag; | |
ef24f6dd | 257 | vp->v_op = vops; |
36d09cb1 | 258 | insmntque(vp, mp); |
36d09cb1 | 259 | *vpp = vp; |
3fc2ac18 | 260 | vp->v_data = 0; |
36d09cb1 KM |
261 | return (0); |
262 | } | |
36d09cb1 KM |
263 | /* |
264 | * Move a vnode from one mount queue to another. | |
265 | */ | |
266 | insmntque(vp, mp) | |
267 | register struct vnode *vp; | |
268 | register struct mount *mp; | |
269 | { | |
8136adfc | 270 | register struct vnode *vq; |
36d09cb1 KM |
271 | |
272 | /* | |
273 | * Delete from old mount point vnode list, if on one. | |
274 | */ | |
3fc2ac18 KM |
275 | if (vp->v_mount != NULL) |
276 | LIST_REMOVE(vp, v_mntvnodes); | |
36d09cb1 KM |
277 | /* |
278 | * Insert into list of vnodes for the new mount point, if available. | |
279 | */ | |
3fc2ac18 | 280 | if ((vp->v_mount = mp) == NULL) |
36d09cb1 | 281 | return; |
3fc2ac18 | 282 | LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); |
36d09cb1 KM |
283 | } |
284 | ||
76429560 KM |
285 | /* |
286 | * Update outstanding I/O count and do wakeup if requested. | |
287 | */ | |
288 | vwakeup(bp) | |
289 | register struct buf *bp; | |
290 | { | |
291 | register struct vnode *vp; | |
292 | ||
a9338fad | 293 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
294 | if (vp = bp->b_vp) { |
295 | vp->v_numoutput--; | |
1f9d2249 MS |
296 | if (vp->v_numoutput < 0) |
297 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
298 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
299 | if (vp->v_numoutput < 0) | |
300 | panic("vwakeup: neg numoutput"); | |
301 | vp->v_flag &= ~VBWAIT; | |
302 | wakeup((caddr_t)&vp->v_numoutput); | |
303 | } | |
304 | } | |
305 | } | |
306 | ||
76429560 KM |
307 | /* |
308 | * Flush out and invalidate all buffers associated with a vnode. | |
309 | * Called with the underlying object locked. | |
310 | */ | |
d024c2ce | 311 | int |
c33e9e8b | 312 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 313 | register struct vnode *vp; |
12079a9d | 314 | int flags; |
d024c2ce KM |
315 | struct ucred *cred; |
316 | struct proc *p; | |
c33e9e8b | 317 | int slpflag, slptimeo; |
76429560 KM |
318 | { |
319 | register struct buf *bp; | |
320 | struct buf *nbp, *blist; | |
d024c2ce | 321 | int s, error; |
76429560 | 322 | |
12079a9d | 323 | if (flags & V_SAVE) { |
d024c2ce KM |
324 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
325 | return (error); | |
3fc2ac18 | 326 | if (vp->v_dirtyblkhd.lh_first != NULL) |
d024c2ce KM |
327 | panic("vinvalbuf: dirty bufs"); |
328 | } | |
76429560 | 329 | for (;;) { |
3fc2ac18 | 330 | if ((blist = vp->v_cleanblkhd.lh_first) && flags & V_SAVEMETA) |
12079a9d | 331 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 KM |
332 | blist = blist->b_vnbufs.le_next; |
333 | if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && | |
e3249ec0 | 334 | (flags & V_SAVEMETA)) |
12079a9d | 335 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 | 336 | blist = blist->b_vnbufs.le_next; |
12079a9d | 337 | if (!blist) |
76429560 | 338 | break; |
12079a9d | 339 | |
76429560 | 340 | for (bp = blist; bp; bp = nbp) { |
3fc2ac18 | 341 | nbp = bp->b_vnbufs.le_next; |
12079a9d MS |
342 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
343 | continue; | |
76429560 KM |
344 | s = splbio(); |
345 | if (bp->b_flags & B_BUSY) { | |
346 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
347 | error = tsleep((caddr_t)bp, |
348 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
349 | slptimeo); | |
76429560 | 350 | splx(s); |
c33e9e8b KM |
351 | if (error) |
352 | return (error); | |
76429560 KM |
353 | break; |
354 | } | |
355 | bremfree(bp); | |
356 | bp->b_flags |= B_BUSY; | |
357 | splx(s); | |
c33e9e8b KM |
358 | /* |
359 | * XXX Since there are no node locks for NFS, I believe | |
360 | * there is a slight chance that a delayed write will | |
361 | * occur while sleeping just above, so check for it. | |
362 | */ | |
363 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
364 | (void) VOP_BWRITE(bp); | |
365 | break; | |
366 | } | |
12079a9d | 367 | bp->b_flags |= B_INVAL; |
76429560 KM |
368 | brelse(bp); |
369 | } | |
370 | } | |
e3249ec0 | 371 | if (!(flags & V_SAVEMETA) && |
3fc2ac18 | 372 | (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) |
76429560 | 373 | panic("vinvalbuf: flush failed"); |
d024c2ce | 374 | return (0); |
76429560 KM |
375 | } |
376 | ||
377 | /* | |
378 | * Associate a buffer with a vnode. | |
379 | */ | |
380 | bgetvp(vp, bp) | |
381 | register struct vnode *vp; | |
382 | register struct buf *bp; | |
383 | { | |
8136adfc | 384 | register struct vnode *vq; |
76429560 KM |
385 | |
386 | if (bp->b_vp) | |
387 | panic("bgetvp: not free"); | |
388 | VHOLD(vp); | |
389 | bp->b_vp = vp; | |
390 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
391 | bp->b_dev = vp->v_rdev; | |
392 | else | |
393 | bp->b_dev = NODEV; | |
394 | /* | |
395 | * Insert onto list for new vnode. | |
396 | */ | |
e3249ec0 | 397 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
398 | } |
399 | ||
400 | /* | |
401 | * Disassociate a buffer from a vnode. | |
402 | */ | |
403 | brelvp(bp) | |
404 | register struct buf *bp; | |
405 | { | |
76429560 KM |
406 | struct vnode *vp; |
407 | ||
408 | if (bp->b_vp == (struct vnode *) 0) | |
409 | panic("brelvp: NULL"); | |
410 | /* | |
411 | * Delete from old vnode list, if on one. | |
412 | */ | |
3fc2ac18 | 413 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 414 | bufremvn(bp); |
76429560 KM |
415 | vp = bp->b_vp; |
416 | bp->b_vp = (struct vnode *) 0; | |
417 | HOLDRELE(vp); | |
418 | } | |
419 | ||
420 | /* | |
421 | * Reassign a buffer from one vnode to another. | |
422 | * Used to assign file specific control information | |
423 | * (indirect blocks) to the vnode to which they belong. | |
424 | */ | |
425 | reassignbuf(bp, newvp) | |
426 | register struct buf *bp; | |
427 | register struct vnode *newvp; | |
428 | { | |
3fc2ac18 | 429 | register struct buflists *listheadp; |
76429560 | 430 | |
e5c3f16e KM |
431 | if (newvp == NULL) { |
432 | printf("reassignbuf: NULL"); | |
433 | return; | |
434 | } | |
76429560 KM |
435 | /* |
436 | * Delete from old vnode list, if on one. | |
437 | */ | |
3fc2ac18 | 438 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 439 | bufremvn(bp); |
76429560 KM |
440 | /* |
441 | * If dirty, put on list of dirty buffers; | |
442 | * otherwise insert onto list of clean buffers. | |
443 | */ | |
444 | if (bp->b_flags & B_DELWRI) | |
445 | listheadp = &newvp->v_dirtyblkhd; | |
446 | else | |
447 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 448 | bufinsvn(bp, listheadp); |
76429560 KM |
449 | } |
450 | ||
36d09cb1 | 451 | /* |
ef24f6dd KM |
452 | * Create a vnode for a block device. |
453 | * Used for root filesystem, argdev, and swap areas. | |
454 | * Also used for memory file system special devices. | |
455 | */ | |
456 | bdevvp(dev, vpp) | |
457 | dev_t dev; | |
458 | struct vnode **vpp; | |
459 | { | |
ef24f6dd KM |
460 | register struct vnode *vp; |
461 | struct vnode *nvp; | |
462 | int error; | |
463 | ||
1c89915d KM |
464 | if (dev == NODEV) |
465 | return (0); | |
9342689a | 466 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
467 | if (error) { |
468 | *vpp = 0; | |
469 | return (error); | |
470 | } | |
471 | vp = nvp; | |
472 | vp->v_type = VBLK; | |
c0de8792 | 473 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
474 | vput(vp); |
475 | vp = nvp; | |
476 | } | |
477 | *vpp = vp; | |
478 | return (0); | |
479 | } | |
480 | ||
481 | /* | |
482 | * Check to see if the new vnode represents a special device | |
483 | * for which we already have a vnode (either because of | |
484 | * bdevvp() or because of a different vnode representing | |
485 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 486 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
487 | * caller is responsible for filling it with its new contents. |
488 | */ | |
489 | struct vnode * | |
c0de8792 | 490 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 491 | register struct vnode *nvp; |
c0de8792 | 492 | dev_t nvp_rdev; |
ef24f6dd KM |
493 | struct mount *mp; |
494 | { | |
495 | register struct vnode *vp; | |
c0de8792 | 496 | struct vnode **vpp; |
ef24f6dd KM |
497 | |
498 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 499 | return (NULLVP); |
c0de8792 KM |
500 | |
501 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 502 | loop: |
c0de8792 KM |
503 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
504 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 505 | continue; |
c0de8792 KM |
506 | /* |
507 | * Alias, but not in use, so flush it out. | |
508 | */ | |
7f7b7d89 | 509 | if (vp->v_usecount == 0) { |
c0de8792 KM |
510 | vgone(vp); |
511 | goto loop; | |
512 | } | |
3fc2ac18 | 513 | if (vget(vp, 1)) |
ef62830d | 514 | goto loop; |
ef24f6dd KM |
515 | break; |
516 | } | |
c0de8792 | 517 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
518 | MALLOC(nvp->v_specinfo, struct specinfo *, |
519 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
520 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 521 | nvp->v_hashchain = vpp; |
c0de8792 | 522 | nvp->v_specnext = *vpp; |
2c957a90 | 523 | nvp->v_specflags = 0; |
c0de8792 | 524 | *vpp = nvp; |
40452d5e KM |
525 | if (vp != NULL) { |
526 | nvp->v_flag |= VALIASED; | |
527 | vp->v_flag |= VALIASED; | |
528 | vput(vp); | |
529 | } | |
54fb9dc2 | 530 | return (NULLVP); |
ef24f6dd | 531 | } |
2bae1875 KM |
532 | VOP_UNLOCK(vp); |
533 | vclean(vp, 0); | |
ef24f6dd KM |
534 | vp->v_op = nvp->v_op; |
535 | vp->v_tag = nvp->v_tag; | |
536 | nvp->v_type = VNON; | |
537 | insmntque(vp, mp); | |
538 | return (vp); | |
539 | } | |
540 | ||
541 | /* | |
542 | * Grab a particular vnode from the free list, increment its | |
543 | * reference count and lock it. The vnode lock bit is set the | |
544 | * vnode is being eliminated in vgone. The process is awakened | |
545 | * when the transition is completed, and an error returned to | |
546 | * indicate that the vnode is no longer usable (possibly having | |
547 | * been changed to a new file system type). | |
36d09cb1 | 548 | */ |
3fc2ac18 | 549 | vget(vp, lockflag) |
36d09cb1 | 550 | register struct vnode *vp; |
3fc2ac18 | 551 | int lockflag; |
36d09cb1 KM |
552 | { |
553 | register struct vnode *vq; | |
554 | ||
ef24f6dd KM |
555 | if (vp->v_flag & VXLOCK) { |
556 | vp->v_flag |= VXWANT; | |
557 | sleep((caddr_t)vp, PINOD); | |
558 | return (1); | |
559 | } | |
3fc2ac18 KM |
560 | if (vp->v_usecount == 0) |
561 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); | |
ec04fc59 | 562 | vp->v_usecount++; |
3fc2ac18 KM |
563 | if (lockflag) |
564 | VOP_LOCK(vp); | |
ef24f6dd | 565 | return (0); |
36d09cb1 KM |
566 | } |
567 | ||
d32390ea KM |
568 | int bug_refs = 0; |
569 | ||
36d09cb1 KM |
570 | /* |
571 | * Vnode reference, just increment the count | |
572 | */ | |
573 | void vref(vp) | |
574 | struct vnode *vp; | |
575 | { | |
576 | ||
ec04fc59 KM |
577 | if (vp->v_usecount <= 0) |
578 | panic("vref used where vget required"); | |
7f7b7d89 | 579 | vp->v_usecount++; |
d32390ea KM |
580 | if (vp->v_type != VBLK && curproc) |
581 | curproc->p_spare[0]++; | |
582 | if (bug_refs) | |
583 | vprint("vref: "); | |
36d09cb1 KM |
584 | } |
585 | ||
586 | /* | |
587 | * vput(), just unlock and vrele() | |
588 | */ | |
589 | void vput(vp) | |
590 | register struct vnode *vp; | |
591 | { | |
4d1ee2eb | 592 | |
36d09cb1 KM |
593 | VOP_UNLOCK(vp); |
594 | vrele(vp); | |
595 | } | |
596 | ||
597 | /* | |
598 | * Vnode release. | |
599 | * If count drops to zero, call inactive routine and return to freelist. | |
600 | */ | |
601 | void vrele(vp) | |
602 | register struct vnode *vp; | |
603 | { | |
604 | ||
65c3b3a8 | 605 | #ifdef DIAGNOSTIC |
36d09cb1 | 606 | if (vp == NULL) |
ef24f6dd | 607 | panic("vrele: null vp"); |
65c3b3a8 | 608 | #endif |
7f7b7d89 | 609 | vp->v_usecount--; |
d32390ea KM |
610 | if (vp->v_type != VBLK && curproc) |
611 | curproc->p_spare[0]--; | |
612 | if (bug_refs) | |
613 | vprint("vref: "); | |
7f7b7d89 | 614 | if (vp->v_usecount > 0) |
36d09cb1 | 615 | return; |
65c3b3a8 KM |
616 | #ifdef DIAGNOSTIC |
617 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
618 | vprint("vrele: bad ref count", vp); | |
619 | panic("vrele: ref cnt"); | |
620 | } | |
621 | #endif | |
dc998e72 KM |
622 | /* |
623 | * insert at tail of LRU list | |
624 | */ | |
3fc2ac18 | 625 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
d024c2ce | 626 | VOP_INACTIVE(vp); |
ef24f6dd KM |
627 | } |
628 | ||
7f7b7d89 KM |
629 | /* |
630 | * Page or buffer structure gets a reference. | |
631 | */ | |
451df175 | 632 | void vhold(vp) |
7f7b7d89 KM |
633 | register struct vnode *vp; |
634 | { | |
635 | ||
636 | vp->v_holdcnt++; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Page or buffer structure frees a reference. | |
641 | */ | |
451df175 | 642 | void holdrele(vp) |
7f7b7d89 KM |
643 | register struct vnode *vp; |
644 | { | |
645 | ||
646 | if (vp->v_holdcnt <= 0) | |
647 | panic("holdrele: holdcnt"); | |
648 | vp->v_holdcnt--; | |
649 | } | |
650 | ||
f0556f86 KM |
651 | /* |
652 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
653 | * | |
654 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
655 | * return error if any are found (nb: this is a user error, not a | |
656 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
657 | * that are found. | |
658 | */ | |
bb4964fd KM |
659 | int busyprt = 0; /* print out busy vnodes */ |
660 | struct ctldebug debug1 = { "busyprt", &busyprt }; | |
f0556f86 KM |
661 | |
662 | vflush(mp, skipvp, flags) | |
663 | struct mount *mp; | |
664 | struct vnode *skipvp; | |
665 | int flags; | |
666 | { | |
667 | register struct vnode *vp, *nvp; | |
668 | int busy = 0; | |
669 | ||
54fb9dc2 | 670 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 671 | panic("vflush: not busy"); |
4597dd33 | 672 | loop: |
3fc2ac18 | 673 | for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { |
4597dd33 KM |
674 | if (vp->v_mount != mp) |
675 | goto loop; | |
3fc2ac18 | 676 | nvp = vp->v_mntvnodes.le_next; |
f0556f86 KM |
677 | /* |
678 | * Skip over a selected vnode. | |
f0556f86 KM |
679 | */ |
680 | if (vp == skipvp) | |
681 | continue; | |
36ef03ec KM |
682 | /* |
683 | * Skip over a vnodes marked VSYSTEM. | |
684 | */ | |
685 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
686 | continue; | |
da374605 KM |
687 | /* |
688 | * If WRITECLOSE is set, only flush out regular file | |
689 | * vnodes open for writing. | |
690 | */ | |
691 | if ((flags & WRITECLOSE) && | |
692 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
693 | continue; | |
f0556f86 | 694 | /* |
7f7b7d89 | 695 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
696 | * out the vnode data structures and we are done. |
697 | */ | |
7f7b7d89 | 698 | if (vp->v_usecount == 0) { |
f0556f86 KM |
699 | vgone(vp); |
700 | continue; | |
701 | } | |
702 | /* | |
da374605 | 703 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
704 | * For block or character devices, revert to an |
705 | * anonymous device. For all other files, just kill them. | |
706 | */ | |
36ef03ec | 707 | if (flags & FORCECLOSE) { |
f0556f86 KM |
708 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
709 | vgone(vp); | |
710 | } else { | |
711 | vclean(vp, 0); | |
9342689a | 712 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
713 | insmntque(vp, (struct mount *)0); |
714 | } | |
715 | continue; | |
716 | } | |
717 | if (busyprt) | |
0bf84b18 | 718 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
719 | busy++; |
720 | } | |
721 | if (busy) | |
722 | return (EBUSY); | |
723 | return (0); | |
724 | } | |
725 | ||
ef24f6dd KM |
726 | /* |
727 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 728 | */ |
ecf75a7d KM |
729 | void |
730 | vclean(vp, flags) | |
ef24f6dd | 731 | register struct vnode *vp; |
aacc1bff | 732 | int flags; |
ef24f6dd | 733 | { |
2bae1875 | 734 | int active; |
ef24f6dd | 735 | |
2bae1875 KM |
736 | /* |
737 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
738 | * If so we have to reference it before we clean it out |
739 | * so that its count cannot fall to zero and generate a | |
740 | * race against ourselves to recycle it. | |
2bae1875 | 741 | */ |
7f7b7d89 | 742 | if (active = vp->v_usecount) |
2bae1875 | 743 | VREF(vp); |
669df1aa KM |
744 | /* |
745 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
746 | * have the object locked while it cleans it out. The VOP_LOCK | |
747 | * ensures that the VOP_INACTIVE routine is done with its work. | |
748 | * For active vnodes, it ensures that no other activity can | |
749 | * occur while the underlying object is being cleaned out. | |
750 | */ | |
751 | VOP_LOCK(vp); | |
2bae1875 KM |
752 | /* |
753 | * Prevent the vnode from being recycled or | |
754 | * brought into use while we clean it out. | |
755 | */ | |
0bf84b18 KM |
756 | if (vp->v_flag & VXLOCK) |
757 | panic("vclean: deadlock"); | |
ef24f6dd | 758 | vp->v_flag |= VXLOCK; |
0bf84b18 | 759 | /* |
669df1aa | 760 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 761 | */ |
36ef03ec | 762 | if (flags & DOCLOSE) |
c33e9e8b | 763 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 764 | /* |
669df1aa KM |
765 | * Any other processes trying to obtain this lock must first |
766 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 767 | */ |
669df1aa | 768 | VOP_UNLOCK(vp); |
ef24f6dd | 769 | /* |
669df1aa KM |
770 | * If purging an active vnode, it must be closed and |
771 | * deactivated before being reclaimed. | |
ef24f6dd | 772 | */ |
2bae1875 | 773 | if (active) { |
669df1aa KM |
774 | if (flags & DOCLOSE) |
775 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
776 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
777 | } |
778 | /* | |
779 | * Reclaim the vnode. | |
780 | */ | |
669df1aa | 781 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 782 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
783 | if (active) |
784 | vrele(vp); | |
38c46eee | 785 | |
ef24f6dd | 786 | /* |
669df1aa | 787 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 788 | */ |
669df1aa KM |
789 | vp->v_op = dead_vnodeop_p; |
790 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
791 | vp->v_flag &= ~VXLOCK; |
792 | if (vp->v_flag & VXWANT) { | |
793 | vp->v_flag &= ~VXWANT; | |
794 | wakeup((caddr_t)vp); | |
795 | } | |
796 | } | |
797 | ||
ef62830d KM |
798 | /* |
799 | * Eliminate all activity associated with the requested vnode | |
800 | * and with all vnodes aliased to the requested vnode. | |
801 | */ | |
802 | void vgoneall(vp) | |
803 | register struct vnode *vp; | |
804 | { | |
7f7b7d89 | 805 | register struct vnode *vq; |
ef62830d | 806 | |
7a7b3a95 KM |
807 | if (vp->v_flag & VALIASED) { |
808 | /* | |
809 | * If a vgone (or vclean) is already in progress, | |
810 | * wait until it is done and return. | |
811 | */ | |
812 | if (vp->v_flag & VXLOCK) { | |
813 | vp->v_flag |= VXWANT; | |
814 | sleep((caddr_t)vp, PINOD); | |
815 | return; | |
816 | } | |
817 | /* | |
818 | * Ensure that vp will not be vgone'd while we | |
819 | * are eliminating its aliases. | |
820 | */ | |
821 | vp->v_flag |= VXLOCK; | |
822 | while (vp->v_flag & VALIASED) { | |
823 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
824 | if (vq->v_rdev != vp->v_rdev || | |
825 | vq->v_type != vp->v_type || vp == vq) | |
826 | continue; | |
827 | vgone(vq); | |
828 | break; | |
829 | } | |
ef62830d | 830 | } |
7a7b3a95 KM |
831 | /* |
832 | * Remove the lock so that vgone below will | |
833 | * really eliminate the vnode after which time | |
834 | * vgone will awaken any sleepers. | |
835 | */ | |
836 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
837 | } |
838 | vgone(vp); | |
839 | } | |
840 | ||
ef24f6dd KM |
841 | /* |
842 | * Eliminate all activity associated with a vnode | |
843 | * in preparation for reuse. | |
844 | */ | |
845 | void vgone(vp) | |
846 | register struct vnode *vp; | |
847 | { | |
7f7b7d89 | 848 | register struct vnode *vq; |
c0de8792 | 849 | struct vnode *vx; |
ef24f6dd | 850 | |
4f55e3ec KM |
851 | /* |
852 | * If a vgone (or vclean) is already in progress, | |
853 | * wait until it is done and return. | |
854 | */ | |
855 | if (vp->v_flag & VXLOCK) { | |
856 | vp->v_flag |= VXWANT; | |
857 | sleep((caddr_t)vp, PINOD); | |
858 | return; | |
859 | } | |
ef24f6dd KM |
860 | /* |
861 | * Clean out the filesystem specific data. | |
862 | */ | |
36ef03ec | 863 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
864 | /* |
865 | * Delete from old mount point vnode list, if on one. | |
866 | */ | |
3fc2ac18 KM |
867 | if (vp->v_mount != NULL) { |
868 | LIST_REMOVE(vp, v_mntvnodes); | |
d10e9258 | 869 | vp->v_mount = NULL; |
ef24f6dd KM |
870 | } |
871 | /* | |
872 | * If special device, remove it from special device alias list. | |
873 | */ | |
874 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
875 | if (*vp->v_hashchain == vp) { |
876 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 877 | } else { |
7f7b7d89 | 878 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 879 | if (vq->v_specnext != vp) |
ef24f6dd | 880 | continue; |
c0de8792 | 881 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
882 | break; |
883 | } | |
c0de8792 | 884 | if (vq == NULL) |
ef24f6dd KM |
885 | panic("missing bdev"); |
886 | } | |
c0de8792 | 887 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 888 | vx = NULL; |
7f7b7d89 | 889 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
890 | if (vq->v_rdev != vp->v_rdev || |
891 | vq->v_type != vp->v_type) | |
c0de8792 | 892 | continue; |
4d1ee2eb CT |
893 | if (vx) |
894 | break; | |
c0de8792 KM |
895 | vx = vq; |
896 | } | |
4d1ee2eb | 897 | if (vx == NULL) |
c0de8792 | 898 | panic("missing alias"); |
4d1ee2eb | 899 | if (vq == NULL) |
c0de8792 KM |
900 | vx->v_flag &= ~VALIASED; |
901 | vp->v_flag &= ~VALIASED; | |
902 | } | |
903 | FREE(vp->v_specinfo, M_VNODE); | |
904 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
905 | } |
906 | /* | |
3387ef89 KM |
907 | * If it is on the freelist and not already at the head, |
908 | * move it to the head of the list. | |
ef24f6dd | 909 | */ |
3fc2ac18 KM |
910 | if (vp->v_usecount == 0 && vnode_free_list.tqh_first != vp) { |
911 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); | |
912 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); | |
ef24f6dd | 913 | } |
2bae1875 | 914 | vp->v_type = VBAD; |
36d09cb1 | 915 | } |
ef62830d | 916 | |
2bcd6066 KM |
917 | /* |
918 | * Lookup a vnode by device number. | |
919 | */ | |
920 | vfinddev(dev, type, vpp) | |
921 | dev_t dev; | |
922 | enum vtype type; | |
923 | struct vnode **vpp; | |
924 | { | |
925 | register struct vnode *vp; | |
926 | ||
927 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
928 | if (dev != vp->v_rdev || type != vp->v_type) | |
929 | continue; | |
930 | *vpp = vp; | |
05378ee4 | 931 | return (1); |
2bcd6066 | 932 | } |
05378ee4 | 933 | return (0); |
2bcd6066 KM |
934 | } |
935 | ||
ef62830d KM |
936 | /* |
937 | * Calculate the total number of references to a special device. | |
938 | */ | |
939 | vcount(vp) | |
940 | register struct vnode *vp; | |
941 | { | |
7f7b7d89 | 942 | register struct vnode *vq; |
ef62830d KM |
943 | int count; |
944 | ||
945 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 946 | return (vp->v_usecount); |
ef62830d | 947 | loop: |
7f7b7d89 | 948 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 949 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
950 | continue; |
951 | /* | |
952 | * Alias, but not in use, so flush it out. | |
953 | */ | |
7f7b7d89 | 954 | if (vq->v_usecount == 0) { |
ef62830d KM |
955 | vgone(vq); |
956 | goto loop; | |
957 | } | |
7f7b7d89 | 958 | count += vq->v_usecount; |
ef62830d KM |
959 | } |
960 | return (count); | |
961 | } | |
0bf84b18 KM |
962 | |
963 | /* | |
964 | * Print out a description of a vnode. | |
965 | */ | |
966 | static char *typename[] = | |
61f846a8 | 967 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
968 | |
969 | vprint(label, vp) | |
970 | char *label; | |
971 | register struct vnode *vp; | |
972 | { | |
f2f730c6 | 973 | char buf[64]; |
0bf84b18 KM |
974 | |
975 | if (label != NULL) | |
976 | printf("%s: ", label); | |
65c3b3a8 KM |
977 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
978 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
979 | vp->v_holdcnt); | |
f2f730c6 KM |
980 | buf[0] = '\0'; |
981 | if (vp->v_flag & VROOT) | |
982 | strcat(buf, "|VROOT"); | |
983 | if (vp->v_flag & VTEXT) | |
984 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
985 | if (vp->v_flag & VSYSTEM) |
986 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
987 | if (vp->v_flag & VXLOCK) |
988 | strcat(buf, "|VXLOCK"); | |
989 | if (vp->v_flag & VXWANT) | |
990 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
991 | if (vp->v_flag & VBWAIT) |
992 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
993 | if (vp->v_flag & VALIASED) |
994 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
995 | if (buf[0] != '\0') |
996 | printf(" flags (%s)", &buf[1]); | |
3fc2ac18 KM |
997 | if (vp->v_data == NULL) { |
998 | printf("\n"); | |
999 | } else { | |
1000 | printf("\n\t"); | |
1001 | VOP_PRINT(vp); | |
1002 | } | |
0bf84b18 | 1003 | } |
985cbdd5 | 1004 | |
34c62e18 KM |
1005 | #ifdef DEBUG |
1006 | /* | |
1007 | * List all of the locked vnodes in the system. | |
1008 | * Called when debugging the kernel. | |
1009 | */ | |
1010 | printlockedvnodes() | |
1011 | { | |
1012 | register struct mount *mp; | |
1013 | register struct vnode *vp; | |
1014 | ||
1015 | printf("Locked vnodes\n"); | |
3fc2ac18 KM |
1016 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
1017 | for (vp = mp->mnt_vnodelist.lh_first; | |
1018 | vp != NULL; | |
1019 | vp = vp->v_mntvnodes.le_next) | |
34c62e18 KM |
1020 | if (VOP_ISLOCKED(vp)) |
1021 | vprint((char *)0, vp); | |
3fc2ac18 | 1022 | } |
34c62e18 KM |
1023 | } |
1024 | #endif | |
1025 | ||
985cbdd5 MT |
1026 | int kinfo_vdebug = 1; |
1027 | int kinfo_vgetfailed; | |
1028 | #define KINFO_VNODESLOP 10 | |
1029 | /* | |
786fb484 | 1030 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1031 | * Copyout address of vnode followed by vnode. |
1032 | */ | |
aacc1bff | 1033 | /* ARGSUSED */ |
786fb484 | 1034 | sysctl_vnode(where, sizep) |
985cbdd5 | 1035 | char *where; |
c1909da4 | 1036 | size_t *sizep; |
985cbdd5 | 1037 | { |
3fc2ac18 | 1038 | register struct mount *mp, *nmp; |
985cbdd5 | 1039 | struct vnode *vp; |
985cbdd5 | 1040 | register char *bp = where, *savebp; |
5bf57294 | 1041 | char *ewhere; |
985cbdd5 MT |
1042 | int error; |
1043 | ||
1044 | #define VPTRSZ sizeof (struct vnode *) | |
1045 | #define VNODESZ sizeof (struct vnode) | |
1046 | if (where == NULL) { | |
786fb484 | 1047 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1048 | return (0); |
1049 | } | |
786fb484 | 1050 | ewhere = where + *sizep; |
985cbdd5 | 1051 | |
3fc2ac18 KM |
1052 | for (mp = mountlist.tqh_first; mp != NULL; mp = nmp) { |
1053 | nmp = mp->mnt_list.tqe_next; | |
1054 | if (vfs_busy(mp)) | |
36ef03ec | 1055 | continue; |
985cbdd5 MT |
1056 | savebp = bp; |
1057 | again: | |
3fc2ac18 KM |
1058 | for (vp = mp->mnt_vnodelist.lh_first; |
1059 | vp != NULL; | |
1060 | vp = vp->v_mntvnodes.le_next) { | |
41185b3b KM |
1061 | /* |
1062 | * Check that the vp is still associated with | |
1063 | * this filesystem. RACE: could have been | |
1064 | * recycled onto the same filesystem. | |
1065 | */ | |
4597dd33 KM |
1066 | if (vp->v_mount != mp) { |
1067 | if (kinfo_vdebug) | |
1068 | printf("kinfo: vp changed\n"); | |
1069 | bp = savebp; | |
1070 | goto again; | |
1071 | } | |
786fb484 KM |
1072 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1073 | *sizep = bp - where; | |
1074 | return (ENOMEM); | |
1075 | } | |
1076 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1077 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1078 | return (error); |
985cbdd5 | 1079 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1080 | } |
3fc2ac18 KM |
1081 | vfs_unbusy(mp); |
1082 | } | |
985cbdd5 | 1083 | |
786fb484 | 1084 | *sizep = bp - where; |
985cbdd5 MT |
1085 | return (0); |
1086 | } |