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 | * |
3e787e54 | 7 | * @(#)vfs_subr.c 8.6.1.1 (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 bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) |
45 | #define bufremvn(bp) { \ | |
46 | LIST_REMOVE(bp, b_vnbufs); \ | |
47 | (bp)->b_vnbufs.le_next = NOLIST; \ | |
48 | } | |
49 | ||
50 | TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ | |
51 | struct mntlist mountlist; /* mounted filesystem list */ | |
e3249ec0 | 52 | |
3c4390e8 | 53 | /* |
3fc2ac18 | 54 | * Initialize the vnode management data structures. |
3c4390e8 | 55 | */ |
3fc2ac18 | 56 | vntblinit() |
3c4390e8 KM |
57 | { |
58 | ||
3fc2ac18 KM |
59 | TAILQ_INIT(&vnode_free_list); |
60 | TAILQ_INIT(&mountlist); | |
3c4390e8 KM |
61 | } |
62 | ||
63 | /* | |
64 | * Lock a filesystem. | |
65 | * Used to prevent access to it while mounting and unmounting. | |
66 | */ | |
67 | vfs_lock(mp) | |
68 | register struct mount *mp; | |
69 | { | |
70 | ||
54fb9dc2 KM |
71 | while(mp->mnt_flag & MNT_MLOCK) { |
72 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
73 | sleep((caddr_t)mp, PVFS); |
74 | } | |
54fb9dc2 | 75 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
76 | return (0); |
77 | } | |
78 | ||
79 | /* | |
80 | * Unlock a locked filesystem. | |
81 | * Panic if filesystem is not locked. | |
82 | */ | |
83 | void | |
84 | vfs_unlock(mp) | |
85 | register struct mount *mp; | |
86 | { | |
87 | ||
54fb9dc2 | 88 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 89 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
90 | mp->mnt_flag &= ~MNT_MLOCK; |
91 | if (mp->mnt_flag & MNT_MWAIT) { | |
92 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
93 | wakeup((caddr_t)mp); |
94 | } | |
95 | } | |
96 | ||
36ef03ec KM |
97 | /* |
98 | * Mark a mount point as busy. | |
99 | * Used to synchronize access and to delay unmounting. | |
100 | */ | |
101 | vfs_busy(mp) | |
102 | register struct mount *mp; | |
103 | { | |
104 | ||
54fb9dc2 KM |
105 | while(mp->mnt_flag & MNT_MPBUSY) { |
106 | mp->mnt_flag |= MNT_MPWANT; | |
107 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 108 | } |
d8b63609 KM |
109 | if (mp->mnt_flag & MNT_UNMOUNT) |
110 | return (1); | |
54fb9dc2 | 111 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
112 | return (0); |
113 | } | |
114 | ||
115 | /* | |
116 | * Free a busy filesystem. | |
117 | * Panic if filesystem is not busy. | |
118 | */ | |
36ef03ec KM |
119 | vfs_unbusy(mp) |
120 | register struct mount *mp; | |
121 | { | |
122 | ||
54fb9dc2 | 123 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 124 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
125 | mp->mnt_flag &= ~MNT_MPBUSY; |
126 | if (mp->mnt_flag & MNT_MPWANT) { | |
127 | mp->mnt_flag &= ~MNT_MPWANT; | |
128 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
129 | } |
130 | } | |
131 | ||
3c4390e8 KM |
132 | /* |
133 | * Lookup a mount point by filesystem identifier. | |
134 | */ | |
135 | struct mount * | |
136 | getvfs(fsid) | |
137 | fsid_t *fsid; | |
138 | { | |
139 | register struct mount *mp; | |
140 | ||
3fc2ac18 | 141 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
54fb9dc2 | 142 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
3fc2ac18 | 143 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) |
d713f801 | 144 | return (mp); |
3fc2ac18 | 145 | } |
d713f801 | 146 | return ((struct mount *)0); |
3c4390e8 KM |
147 | } |
148 | ||
917dc539 JSP |
149 | /* |
150 | * Get a new unique fsid | |
151 | */ | |
152 | void | |
153 | getnewfsid(mp, mtype) | |
154 | struct mount *mp; | |
155 | int mtype; | |
156 | { | |
157 | static u_short xxxfs_mntid; | |
158 | ||
159 | fsid_t tfsid; | |
160 | ||
1209b9a4 | 161 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); |
917dc539 JSP |
162 | mp->mnt_stat.f_fsid.val[1] = mtype; |
163 | if (xxxfs_mntid == 0) | |
164 | ++xxxfs_mntid; | |
1209b9a4 | 165 | tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); |
917dc539 | 166 | tfsid.val[1] = mtype; |
3fc2ac18 | 167 | if (mountlist.tqh_first != NULL) { |
17fd1cc7 JSP |
168 | while (getvfs(&tfsid)) { |
169 | tfsid.val[0]++; | |
170 | xxxfs_mntid++; | |
171 | } | |
917dc539 JSP |
172 | } |
173 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
174 | } | |
175 | ||
3c4390e8 KM |
176 | /* |
177 | * Set vnode attributes to VNOVAL | |
178 | */ | |
179 | void vattr_null(vap) | |
180 | register struct vattr *vap; | |
181 | { | |
182 | ||
183 | vap->va_type = VNON; | |
83504fd5 | 184 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 185 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
186 | vap->va_fsid = vap->va_fileid = |
187 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
188 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
189 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
190 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 191 | vap->va_flags = vap->va_gen = VNOVAL; |
fcba749b | 192 | vap->va_vaflags = 0; |
3c4390e8 | 193 | } |
c60798ca | 194 | |
36d09cb1 KM |
195 | /* |
196 | * Routines having to do with the management of the vnode table. | |
197 | */ | |
9342689a | 198 | extern int (**dead_vnodeop_p)(); |
32339c94 | 199 | extern void vclean(); |
1a80f56e | 200 | long numvnodes; |
e781da98 | 201 | extern struct vattr va_null; |
3e787e54 KM |
202 | int newnodes = 0; |
203 | int printcnt = 0; | |
36d09cb1 KM |
204 | |
205 | /* | |
206 | * Return the next vnode from the free list. | |
207 | */ | |
208 | getnewvnode(tag, mp, vops, vpp) | |
209 | enum vtagtype tag; | |
210 | struct mount *mp; | |
cf74dd57 | 211 | int (**vops)(); |
36d09cb1 KM |
212 | struct vnode **vpp; |
213 | { | |
c768e50f | 214 | register struct vnode *vp; |
1f9d2249 | 215 | int s; |
36d09cb1 | 216 | |
3e787e54 | 217 | newnodes++; |
3fc2ac18 KM |
218 | if ((vnode_free_list.tqh_first == NULL && |
219 | numvnodes < 2 * desiredvnodes) || | |
ecf75a7d | 220 | numvnodes < desiredvnodes) { |
aacc1bff KM |
221 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
222 | M_VNODE, M_WAITOK); | |
1a80f56e | 223 | bzero((char *)vp, sizeof *vp); |
3e787e54 KM |
224 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
225 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
226 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; | |
227 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
1a80f56e | 228 | numvnodes++; |
3e787e54 | 229 | vp->v_spare[0] = numvnodes; |
1a80f56e | 230 | } else { |
3fc2ac18 | 231 | if ((vp = vnode_free_list.tqh_first) == NULL) { |
1a80f56e KM |
232 | tablefull("vnode"); |
233 | *vpp = 0; | |
234 | return (ENFILE); | |
235 | } | |
236 | if (vp->v_usecount) | |
237 | panic("free vnode isn't"); | |
3e787e54 KM |
238 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf || |
239 | vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb) | |
240 | panic("getnewvnode: not on queue"); | |
3fc2ac18 | 241 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
3e787e54 | 242 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
0bf9bb76 KM |
243 | /* see comment on why 0xdeadb is set at end of vgone (below) */ |
244 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
39b99eb6 | 245 | vp->v_lease = NULL; |
1a80f56e KM |
246 | if (vp->v_type != VBAD) |
247 | vgone(vp); | |
1f9d2249 | 248 | #ifdef DIAGNOSTIC |
2345b093 KM |
249 | if (vp->v_data) |
250 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
251 | s = splbio(); |
252 | if (vp->v_numoutput) | |
253 | panic("Clean vnode has pending I/O's"); | |
254 | splx(s); | |
255 | #endif | |
1a80f56e | 256 | vp->v_flag = 0; |
1a80f56e | 257 | vp->v_lastr = 0; |
1f9d2249 MS |
258 | vp->v_lastw = 0; |
259 | vp->v_lasta = 0; | |
260 | vp->v_cstart = 0; | |
261 | vp->v_clen = 0; | |
1a80f56e | 262 | vp->v_socket = 0; |
36d09cb1 | 263 | } |
1f9d2249 | 264 | vp->v_ralen = 1; |
b027498b | 265 | vp->v_type = VNON; |
36d09cb1 KM |
266 | cache_purge(vp); |
267 | vp->v_tag = tag; | |
ef24f6dd | 268 | vp->v_op = vops; |
36d09cb1 | 269 | insmntque(vp, mp); |
36d09cb1 | 270 | *vpp = vp; |
0bf9bb76 | 271 | vp->v_usecount = 1; |
3fc2ac18 | 272 | vp->v_data = 0; |
3e787e54 | 273 | if (printcnt-- > 0) vprint("getnewvnode got", vp); |
36d09cb1 KM |
274 | return (0); |
275 | } | |
36d09cb1 KM |
276 | /* |
277 | * Move a vnode from one mount queue to another. | |
278 | */ | |
279 | insmntque(vp, mp) | |
280 | register struct vnode *vp; | |
281 | register struct mount *mp; | |
282 | { | |
36d09cb1 KM |
283 | |
284 | /* | |
285 | * Delete from old mount point vnode list, if on one. | |
286 | */ | |
3e787e54 KM |
287 | if (vp->v_mount != NULL) { |
288 | if (vp->v_mntvnodes.le_next == (struct vnode *)0xdeadf || | |
289 | vp->v_mntvnodes.le_prev == (struct vnode **)0xdeadb) | |
290 | panic("insmntque: not on queue"); | |
3fc2ac18 | 291 | LIST_REMOVE(vp, v_mntvnodes); |
3e787e54 KM |
292 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; |
293 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
294 | } | |
36d09cb1 KM |
295 | /* |
296 | * Insert into list of vnodes for the new mount point, if available. | |
297 | */ | |
3fc2ac18 | 298 | if ((vp->v_mount = mp) == NULL) |
36d09cb1 | 299 | return; |
3e787e54 KM |
300 | if (vp->v_mntvnodes.le_next != (struct vnode *)0xdeadf || |
301 | vp->v_mntvnodes.le_prev != (struct vnode **)0xdeadb) | |
302 | panic("insmntque: already on queue"); | |
3fc2ac18 | 303 | LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); |
36d09cb1 KM |
304 | } |
305 | ||
76429560 KM |
306 | /* |
307 | * Update outstanding I/O count and do wakeup if requested. | |
308 | */ | |
309 | vwakeup(bp) | |
310 | register struct buf *bp; | |
311 | { | |
312 | register struct vnode *vp; | |
313 | ||
a9338fad | 314 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
315 | if (vp = bp->b_vp) { |
316 | vp->v_numoutput--; | |
1f9d2249 MS |
317 | if (vp->v_numoutput < 0) |
318 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
319 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
320 | if (vp->v_numoutput < 0) | |
321 | panic("vwakeup: neg numoutput"); | |
322 | vp->v_flag &= ~VBWAIT; | |
323 | wakeup((caddr_t)&vp->v_numoutput); | |
324 | } | |
325 | } | |
326 | } | |
327 | ||
76429560 KM |
328 | /* |
329 | * Flush out and invalidate all buffers associated with a vnode. | |
330 | * Called with the underlying object locked. | |
331 | */ | |
d024c2ce | 332 | int |
c33e9e8b | 333 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 334 | register struct vnode *vp; |
12079a9d | 335 | int flags; |
d024c2ce KM |
336 | struct ucred *cred; |
337 | struct proc *p; | |
c33e9e8b | 338 | int slpflag, slptimeo; |
76429560 KM |
339 | { |
340 | register struct buf *bp; | |
341 | struct buf *nbp, *blist; | |
d024c2ce | 342 | int s, error; |
76429560 | 343 | |
12079a9d | 344 | if (flags & V_SAVE) { |
d024c2ce KM |
345 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
346 | return (error); | |
3fc2ac18 | 347 | if (vp->v_dirtyblkhd.lh_first != NULL) |
d024c2ce KM |
348 | panic("vinvalbuf: dirty bufs"); |
349 | } | |
76429560 | 350 | for (;;) { |
3fc2ac18 | 351 | if ((blist = vp->v_cleanblkhd.lh_first) && flags & V_SAVEMETA) |
12079a9d | 352 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 KM |
353 | blist = blist->b_vnbufs.le_next; |
354 | if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && | |
e3249ec0 | 355 | (flags & V_SAVEMETA)) |
12079a9d | 356 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 | 357 | blist = blist->b_vnbufs.le_next; |
12079a9d | 358 | if (!blist) |
76429560 | 359 | break; |
12079a9d | 360 | |
76429560 | 361 | for (bp = blist; bp; bp = nbp) { |
3fc2ac18 | 362 | nbp = bp->b_vnbufs.le_next; |
12079a9d MS |
363 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
364 | continue; | |
76429560 KM |
365 | s = splbio(); |
366 | if (bp->b_flags & B_BUSY) { | |
367 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
368 | error = tsleep((caddr_t)bp, |
369 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
370 | slptimeo); | |
76429560 | 371 | splx(s); |
c33e9e8b KM |
372 | if (error) |
373 | return (error); | |
76429560 KM |
374 | break; |
375 | } | |
376 | bremfree(bp); | |
377 | bp->b_flags |= B_BUSY; | |
378 | splx(s); | |
c33e9e8b KM |
379 | /* |
380 | * XXX Since there are no node locks for NFS, I believe | |
381 | * there is a slight chance that a delayed write will | |
382 | * occur while sleeping just above, so check for it. | |
383 | */ | |
384 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
385 | (void) VOP_BWRITE(bp); | |
386 | break; | |
387 | } | |
12079a9d | 388 | bp->b_flags |= B_INVAL; |
76429560 KM |
389 | brelse(bp); |
390 | } | |
391 | } | |
e3249ec0 | 392 | if (!(flags & V_SAVEMETA) && |
3fc2ac18 | 393 | (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) |
76429560 | 394 | panic("vinvalbuf: flush failed"); |
d024c2ce | 395 | return (0); |
76429560 KM |
396 | } |
397 | ||
398 | /* | |
399 | * Associate a buffer with a vnode. | |
400 | */ | |
401 | bgetvp(vp, bp) | |
402 | register struct vnode *vp; | |
403 | register struct buf *bp; | |
404 | { | |
405 | ||
406 | if (bp->b_vp) | |
407 | panic("bgetvp: not free"); | |
408 | VHOLD(vp); | |
409 | bp->b_vp = vp; | |
410 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
411 | bp->b_dev = vp->v_rdev; | |
412 | else | |
413 | bp->b_dev = NODEV; | |
414 | /* | |
415 | * Insert onto list for new vnode. | |
416 | */ | |
e3249ec0 | 417 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
418 | } |
419 | ||
420 | /* | |
421 | * Disassociate a buffer from a vnode. | |
422 | */ | |
423 | brelvp(bp) | |
424 | register struct buf *bp; | |
425 | { | |
76429560 KM |
426 | struct vnode *vp; |
427 | ||
428 | if (bp->b_vp == (struct vnode *) 0) | |
429 | panic("brelvp: NULL"); | |
430 | /* | |
431 | * Delete from old vnode list, if on one. | |
432 | */ | |
3fc2ac18 | 433 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 434 | bufremvn(bp); |
76429560 KM |
435 | vp = bp->b_vp; |
436 | bp->b_vp = (struct vnode *) 0; | |
437 | HOLDRELE(vp); | |
438 | } | |
439 | ||
440 | /* | |
441 | * Reassign a buffer from one vnode to another. | |
442 | * Used to assign file specific control information | |
443 | * (indirect blocks) to the vnode to which they belong. | |
444 | */ | |
445 | reassignbuf(bp, newvp) | |
446 | register struct buf *bp; | |
447 | register struct vnode *newvp; | |
448 | { | |
3fc2ac18 | 449 | register struct buflists *listheadp; |
76429560 | 450 | |
e5c3f16e KM |
451 | if (newvp == NULL) { |
452 | printf("reassignbuf: NULL"); | |
453 | return; | |
454 | } | |
76429560 KM |
455 | /* |
456 | * Delete from old vnode list, if on one. | |
457 | */ | |
3fc2ac18 | 458 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 459 | bufremvn(bp); |
76429560 KM |
460 | /* |
461 | * If dirty, put on list of dirty buffers; | |
462 | * otherwise insert onto list of clean buffers. | |
463 | */ | |
464 | if (bp->b_flags & B_DELWRI) | |
465 | listheadp = &newvp->v_dirtyblkhd; | |
466 | else | |
467 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 468 | bufinsvn(bp, listheadp); |
76429560 KM |
469 | } |
470 | ||
36d09cb1 | 471 | /* |
ef24f6dd KM |
472 | * Create a vnode for a block device. |
473 | * Used for root filesystem, argdev, and swap areas. | |
474 | * Also used for memory file system special devices. | |
475 | */ | |
476 | bdevvp(dev, vpp) | |
477 | dev_t dev; | |
478 | struct vnode **vpp; | |
479 | { | |
ef24f6dd KM |
480 | register struct vnode *vp; |
481 | struct vnode *nvp; | |
482 | int error; | |
483 | ||
1c89915d KM |
484 | if (dev == NODEV) |
485 | return (0); | |
9342689a | 486 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
487 | if (error) { |
488 | *vpp = 0; | |
489 | return (error); | |
490 | } | |
491 | vp = nvp; | |
492 | vp->v_type = VBLK; | |
c0de8792 | 493 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
494 | vput(vp); |
495 | vp = nvp; | |
496 | } | |
497 | *vpp = vp; | |
498 | return (0); | |
499 | } | |
500 | ||
501 | /* | |
502 | * Check to see if the new vnode represents a special device | |
503 | * for which we already have a vnode (either because of | |
504 | * bdevvp() or because of a different vnode representing | |
505 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 506 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
507 | * caller is responsible for filling it with its new contents. |
508 | */ | |
509 | struct vnode * | |
c0de8792 | 510 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 511 | register struct vnode *nvp; |
c0de8792 | 512 | dev_t nvp_rdev; |
ef24f6dd KM |
513 | struct mount *mp; |
514 | { | |
515 | register struct vnode *vp; | |
c0de8792 | 516 | struct vnode **vpp; |
ef24f6dd KM |
517 | |
518 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 519 | return (NULLVP); |
c0de8792 KM |
520 | |
521 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 522 | loop: |
c0de8792 KM |
523 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
524 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 525 | continue; |
c0de8792 KM |
526 | /* |
527 | * Alias, but not in use, so flush it out. | |
528 | */ | |
7f7b7d89 | 529 | if (vp->v_usecount == 0) { |
c0de8792 KM |
530 | vgone(vp); |
531 | goto loop; | |
532 | } | |
3fc2ac18 | 533 | if (vget(vp, 1)) |
ef62830d | 534 | goto loop; |
ef24f6dd KM |
535 | break; |
536 | } | |
c0de8792 | 537 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
538 | MALLOC(nvp->v_specinfo, struct specinfo *, |
539 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
540 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 541 | nvp->v_hashchain = vpp; |
c0de8792 | 542 | nvp->v_specnext = *vpp; |
2c957a90 | 543 | nvp->v_specflags = 0; |
c0de8792 | 544 | *vpp = nvp; |
40452d5e KM |
545 | if (vp != NULL) { |
546 | nvp->v_flag |= VALIASED; | |
547 | vp->v_flag |= VALIASED; | |
548 | vput(vp); | |
549 | } | |
54fb9dc2 | 550 | return (NULLVP); |
ef24f6dd | 551 | } |
2bae1875 KM |
552 | VOP_UNLOCK(vp); |
553 | vclean(vp, 0); | |
ef24f6dd KM |
554 | vp->v_op = nvp->v_op; |
555 | vp->v_tag = nvp->v_tag; | |
556 | nvp->v_type = VNON; | |
557 | insmntque(vp, mp); | |
558 | return (vp); | |
559 | } | |
560 | ||
561 | /* | |
562 | * Grab a particular vnode from the free list, increment its | |
563 | * reference count and lock it. The vnode lock bit is set the | |
564 | * vnode is being eliminated in vgone. The process is awakened | |
565 | * when the transition is completed, and an error returned to | |
566 | * indicate that the vnode is no longer usable (possibly having | |
567 | * been changed to a new file system type). | |
36d09cb1 | 568 | */ |
3fc2ac18 | 569 | vget(vp, lockflag) |
36d09cb1 | 570 | register struct vnode *vp; |
3fc2ac18 | 571 | int lockflag; |
36d09cb1 | 572 | { |
36d09cb1 | 573 | |
ef24f6dd KM |
574 | if (vp->v_flag & VXLOCK) { |
575 | vp->v_flag |= VXWANT; | |
576 | sleep((caddr_t)vp, PINOD); | |
577 | return (1); | |
578 | } | |
3e787e54 KM |
579 | if (vp->v_usecount == 0) { |
580 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf || | |
581 | vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb) | |
582 | panic("vget: not on queue"); | |
3fc2ac18 | 583 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
3e787e54 KM |
584 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
585 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
586 | } | |
ec04fc59 | 587 | vp->v_usecount++; |
3fc2ac18 KM |
588 | if (lockflag) |
589 | VOP_LOCK(vp); | |
3e787e54 | 590 | if (printcnt-- > 0) vprint("vget got", vp); |
ef24f6dd | 591 | return (0); |
36d09cb1 KM |
592 | } |
593 | ||
d32390ea KM |
594 | int bug_refs = 0; |
595 | ||
36d09cb1 KM |
596 | /* |
597 | * Vnode reference, just increment the count | |
598 | */ | |
599 | void vref(vp) | |
600 | struct vnode *vp; | |
601 | { | |
602 | ||
ec04fc59 KM |
603 | if (vp->v_usecount <= 0) |
604 | panic("vref used where vget required"); | |
3e787e54 KM |
605 | if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf || |
606 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) | |
607 | panic("vref: not free"); | |
7f7b7d89 | 608 | vp->v_usecount++; |
3e787e54 | 609 | if (printcnt-- > 0) vprint("vref get", vp); |
d32390ea KM |
610 | if (vp->v_type != VBLK && curproc) |
611 | curproc->p_spare[0]++; | |
612 | if (bug_refs) | |
613 | vprint("vref: "); | |
36d09cb1 KM |
614 | } |
615 | ||
616 | /* | |
617 | * vput(), just unlock and vrele() | |
618 | */ | |
619 | void vput(vp) | |
620 | register struct vnode *vp; | |
621 | { | |
4d1ee2eb | 622 | |
36d09cb1 KM |
623 | VOP_UNLOCK(vp); |
624 | vrele(vp); | |
625 | } | |
626 | ||
627 | /* | |
628 | * Vnode release. | |
629 | * If count drops to zero, call inactive routine and return to freelist. | |
630 | */ | |
631 | void vrele(vp) | |
632 | register struct vnode *vp; | |
633 | { | |
634 | ||
65c3b3a8 | 635 | #ifdef DIAGNOSTIC |
36d09cb1 | 636 | if (vp == NULL) |
ef24f6dd | 637 | panic("vrele: null vp"); |
65c3b3a8 | 638 | #endif |
7f7b7d89 | 639 | vp->v_usecount--; |
3e787e54 | 640 | if (printcnt-- > 0) vprint("vrele put", vp); |
d32390ea KM |
641 | if (vp->v_type != VBLK && curproc) |
642 | curproc->p_spare[0]--; | |
643 | if (bug_refs) | |
644 | vprint("vref: "); | |
7f7b7d89 | 645 | if (vp->v_usecount > 0) |
36d09cb1 | 646 | return; |
65c3b3a8 KM |
647 | #ifdef DIAGNOSTIC |
648 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
649 | vprint("vrele: bad ref count", vp); | |
650 | panic("vrele: ref cnt"); | |
651 | } | |
652 | #endif | |
dc998e72 KM |
653 | /* |
654 | * insert at tail of LRU list | |
655 | */ | |
3e787e54 KM |
656 | if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf || |
657 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) | |
658 | panic("vrele: not free"); | |
3fc2ac18 | 659 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
d024c2ce | 660 | VOP_INACTIVE(vp); |
ef24f6dd KM |
661 | } |
662 | ||
7f7b7d89 KM |
663 | /* |
664 | * Page or buffer structure gets a reference. | |
665 | */ | |
451df175 | 666 | void vhold(vp) |
7f7b7d89 KM |
667 | register struct vnode *vp; |
668 | { | |
669 | ||
670 | vp->v_holdcnt++; | |
671 | } | |
672 | ||
673 | /* | |
674 | * Page or buffer structure frees a reference. | |
675 | */ | |
451df175 | 676 | void holdrele(vp) |
7f7b7d89 KM |
677 | register struct vnode *vp; |
678 | { | |
679 | ||
680 | if (vp->v_holdcnt <= 0) | |
681 | panic("holdrele: holdcnt"); | |
682 | vp->v_holdcnt--; | |
683 | } | |
684 | ||
f0556f86 KM |
685 | /* |
686 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
687 | * | |
688 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
689 | * return error if any are found (nb: this is a user error, not a | |
690 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
691 | * that are found. | |
692 | */ | |
bb4964fd KM |
693 | int busyprt = 0; /* print out busy vnodes */ |
694 | struct ctldebug debug1 = { "busyprt", &busyprt }; | |
f0556f86 KM |
695 | |
696 | vflush(mp, skipvp, flags) | |
697 | struct mount *mp; | |
698 | struct vnode *skipvp; | |
699 | int flags; | |
700 | { | |
701 | register struct vnode *vp, *nvp; | |
702 | int busy = 0; | |
703 | ||
54fb9dc2 | 704 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 705 | panic("vflush: not busy"); |
4597dd33 | 706 | loop: |
3fc2ac18 | 707 | for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { |
4597dd33 KM |
708 | if (vp->v_mount != mp) |
709 | goto loop; | |
3fc2ac18 | 710 | nvp = vp->v_mntvnodes.le_next; |
f0556f86 KM |
711 | /* |
712 | * Skip over a selected vnode. | |
f0556f86 KM |
713 | */ |
714 | if (vp == skipvp) | |
715 | continue; | |
36ef03ec KM |
716 | /* |
717 | * Skip over a vnodes marked VSYSTEM. | |
718 | */ | |
719 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
720 | continue; | |
da374605 KM |
721 | /* |
722 | * If WRITECLOSE is set, only flush out regular file | |
723 | * vnodes open for writing. | |
724 | */ | |
725 | if ((flags & WRITECLOSE) && | |
726 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
727 | continue; | |
f0556f86 | 728 | /* |
7f7b7d89 | 729 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
730 | * out the vnode data structures and we are done. |
731 | */ | |
7f7b7d89 | 732 | if (vp->v_usecount == 0) { |
f0556f86 KM |
733 | vgone(vp); |
734 | continue; | |
735 | } | |
736 | /* | |
da374605 | 737 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
738 | * For block or character devices, revert to an |
739 | * anonymous device. For all other files, just kill them. | |
740 | */ | |
36ef03ec | 741 | if (flags & FORCECLOSE) { |
f0556f86 KM |
742 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
743 | vgone(vp); | |
744 | } else { | |
745 | vclean(vp, 0); | |
9342689a | 746 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
747 | insmntque(vp, (struct mount *)0); |
748 | } | |
749 | continue; | |
750 | } | |
751 | if (busyprt) | |
0bf84b18 | 752 | vprint("vflush: busy vnode", vp); |
f0556f86 KM |
753 | busy++; |
754 | } | |
755 | if (busy) | |
756 | return (EBUSY); | |
757 | return (0); | |
758 | } | |
759 | ||
ef24f6dd KM |
760 | /* |
761 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 762 | */ |
ecf75a7d KM |
763 | void |
764 | vclean(vp, flags) | |
ef24f6dd | 765 | register struct vnode *vp; |
aacc1bff | 766 | int flags; |
ef24f6dd | 767 | { |
2bae1875 | 768 | int active; |
ef24f6dd | 769 | |
2bae1875 KM |
770 | /* |
771 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
772 | * If so we have to reference it before we clean it out |
773 | * so that its count cannot fall to zero and generate a | |
774 | * race against ourselves to recycle it. | |
2bae1875 | 775 | */ |
7f7b7d89 | 776 | if (active = vp->v_usecount) |
2bae1875 | 777 | VREF(vp); |
669df1aa KM |
778 | /* |
779 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
780 | * have the object locked while it cleans it out. The VOP_LOCK | |
781 | * ensures that the VOP_INACTIVE routine is done with its work. | |
782 | * For active vnodes, it ensures that no other activity can | |
783 | * occur while the underlying object is being cleaned out. | |
784 | */ | |
785 | VOP_LOCK(vp); | |
2bae1875 KM |
786 | /* |
787 | * Prevent the vnode from being recycled or | |
788 | * brought into use while we clean it out. | |
789 | */ | |
0bf84b18 KM |
790 | if (vp->v_flag & VXLOCK) |
791 | panic("vclean: deadlock"); | |
ef24f6dd | 792 | vp->v_flag |= VXLOCK; |
0bf84b18 | 793 | /* |
669df1aa | 794 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 795 | */ |
36ef03ec | 796 | if (flags & DOCLOSE) |
c33e9e8b | 797 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 798 | /* |
669df1aa KM |
799 | * Any other processes trying to obtain this lock must first |
800 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 801 | */ |
669df1aa | 802 | VOP_UNLOCK(vp); |
ef24f6dd | 803 | /* |
669df1aa KM |
804 | * If purging an active vnode, it must be closed and |
805 | * deactivated before being reclaimed. | |
ef24f6dd | 806 | */ |
2bae1875 | 807 | if (active) { |
669df1aa KM |
808 | if (flags & DOCLOSE) |
809 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
810 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
811 | } |
812 | /* | |
813 | * Reclaim the vnode. | |
814 | */ | |
669df1aa | 815 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 816 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
817 | if (active) |
818 | vrele(vp); | |
38c46eee | 819 | |
ef24f6dd | 820 | /* |
669df1aa | 821 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 822 | */ |
669df1aa KM |
823 | vp->v_op = dead_vnodeop_p; |
824 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
825 | vp->v_flag &= ~VXLOCK; |
826 | if (vp->v_flag & VXWANT) { | |
827 | vp->v_flag &= ~VXWANT; | |
828 | wakeup((caddr_t)vp); | |
829 | } | |
830 | } | |
831 | ||
ef62830d KM |
832 | /* |
833 | * Eliminate all activity associated with the requested vnode | |
834 | * and with all vnodes aliased to the requested vnode. | |
835 | */ | |
836 | void vgoneall(vp) | |
837 | register struct vnode *vp; | |
838 | { | |
7f7b7d89 | 839 | register struct vnode *vq; |
ef62830d | 840 | |
7a7b3a95 KM |
841 | if (vp->v_flag & VALIASED) { |
842 | /* | |
843 | * If a vgone (or vclean) is already in progress, | |
844 | * wait until it is done and return. | |
845 | */ | |
846 | if (vp->v_flag & VXLOCK) { | |
847 | vp->v_flag |= VXWANT; | |
848 | sleep((caddr_t)vp, PINOD); | |
849 | return; | |
850 | } | |
851 | /* | |
852 | * Ensure that vp will not be vgone'd while we | |
853 | * are eliminating its aliases. | |
854 | */ | |
855 | vp->v_flag |= VXLOCK; | |
856 | while (vp->v_flag & VALIASED) { | |
857 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
858 | if (vq->v_rdev != vp->v_rdev || | |
859 | vq->v_type != vp->v_type || vp == vq) | |
860 | continue; | |
861 | vgone(vq); | |
862 | break; | |
863 | } | |
ef62830d | 864 | } |
7a7b3a95 KM |
865 | /* |
866 | * Remove the lock so that vgone below will | |
867 | * really eliminate the vnode after which time | |
868 | * vgone will awaken any sleepers. | |
869 | */ | |
870 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
871 | } |
872 | vgone(vp); | |
873 | } | |
874 | ||
ef24f6dd KM |
875 | /* |
876 | * Eliminate all activity associated with a vnode | |
877 | * in preparation for reuse. | |
878 | */ | |
879 | void vgone(vp) | |
880 | register struct vnode *vp; | |
881 | { | |
7f7b7d89 | 882 | register struct vnode *vq; |
c0de8792 | 883 | struct vnode *vx; |
ef24f6dd | 884 | |
4f55e3ec KM |
885 | /* |
886 | * If a vgone (or vclean) is already in progress, | |
887 | * wait until it is done and return. | |
888 | */ | |
889 | if (vp->v_flag & VXLOCK) { | |
890 | vp->v_flag |= VXWANT; | |
891 | sleep((caddr_t)vp, PINOD); | |
892 | return; | |
893 | } | |
ef24f6dd KM |
894 | /* |
895 | * Clean out the filesystem specific data. | |
896 | */ | |
36ef03ec | 897 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
898 | /* |
899 | * Delete from old mount point vnode list, if on one. | |
900 | */ | |
3fc2ac18 | 901 | if (vp->v_mount != NULL) { |
3e787e54 KM |
902 | if (vp->v_mntvnodes.le_next == (struct vnode *)0xdeadf || |
903 | vp->v_mntvnodes.le_prev == (struct vnode **)0xdeadb) | |
904 | panic("vgone: not on queue"); | |
3fc2ac18 | 905 | LIST_REMOVE(vp, v_mntvnodes); |
3e787e54 KM |
906 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; |
907 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
d10e9258 | 908 | vp->v_mount = NULL; |
ef24f6dd KM |
909 | } |
910 | /* | |
911 | * If special device, remove it from special device alias list. | |
912 | */ | |
913 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
914 | if (*vp->v_hashchain == vp) { |
915 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 916 | } else { |
7f7b7d89 | 917 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 918 | if (vq->v_specnext != vp) |
ef24f6dd | 919 | continue; |
c0de8792 | 920 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
921 | break; |
922 | } | |
c0de8792 | 923 | if (vq == NULL) |
ef24f6dd KM |
924 | panic("missing bdev"); |
925 | } | |
c0de8792 | 926 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 927 | vx = NULL; |
7f7b7d89 | 928 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
929 | if (vq->v_rdev != vp->v_rdev || |
930 | vq->v_type != vp->v_type) | |
c0de8792 | 931 | continue; |
4d1ee2eb CT |
932 | if (vx) |
933 | break; | |
c0de8792 KM |
934 | vx = vq; |
935 | } | |
4d1ee2eb | 936 | if (vx == NULL) |
c0de8792 | 937 | panic("missing alias"); |
4d1ee2eb | 938 | if (vq == NULL) |
c0de8792 KM |
939 | vx->v_flag &= ~VALIASED; |
940 | vp->v_flag &= ~VALIASED; | |
941 | } | |
942 | FREE(vp->v_specinfo, M_VNODE); | |
943 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
944 | } |
945 | /* | |
3387ef89 | 946 | * If it is on the freelist and not already at the head, |
0bf9bb76 KM |
947 | * move it to the head of the list. The test of the back |
948 | * pointer and the reference count of zero is because | |
949 | * it will be removed from the free list by getnewvnode, | |
950 | * but will not have its reference count incremented until | |
951 | * after calling vgone. If the reference count were | |
952 | * incremented first, vgone would (incorrectly) try to | |
953 | * close the previous instance of the underlying object. | |
954 | * So, the back pointer is explicitly set to `0xdeadb' in | |
955 | * getnewvnode after removing it from the freelist to ensure | |
956 | * that we do not try to move it here. | |
ef24f6dd | 957 | */ |
0bf9bb76 KM |
958 | if (vp->v_usecount == 0 && |
959 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb && | |
960 | vnode_free_list.tqh_first != vp) { | |
3e787e54 KM |
961 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf) |
962 | panic("vgone: use 0, not free"); | |
3fc2ac18 KM |
963 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
964 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); | |
ef24f6dd | 965 | } |
2bae1875 | 966 | vp->v_type = VBAD; |
36d09cb1 | 967 | } |
ef62830d | 968 | |
2bcd6066 KM |
969 | /* |
970 | * Lookup a vnode by device number. | |
971 | */ | |
972 | vfinddev(dev, type, vpp) | |
973 | dev_t dev; | |
974 | enum vtype type; | |
975 | struct vnode **vpp; | |
976 | { | |
977 | register struct vnode *vp; | |
978 | ||
979 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
980 | if (dev != vp->v_rdev || type != vp->v_type) | |
981 | continue; | |
982 | *vpp = vp; | |
05378ee4 | 983 | return (1); |
2bcd6066 | 984 | } |
05378ee4 | 985 | return (0); |
2bcd6066 KM |
986 | } |
987 | ||
ef62830d KM |
988 | /* |
989 | * Calculate the total number of references to a special device. | |
990 | */ | |
991 | vcount(vp) | |
992 | register struct vnode *vp; | |
993 | { | |
7f7b7d89 | 994 | register struct vnode *vq; |
ef62830d KM |
995 | int count; |
996 | ||
997 | if ((vp->v_flag & VALIASED) == 0) | |
7f7b7d89 | 998 | return (vp->v_usecount); |
ef62830d | 999 | loop: |
7f7b7d89 | 1000 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c | 1001 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1002 | continue; |
1003 | /* | |
1004 | * Alias, but not in use, so flush it out. | |
1005 | */ | |
7f7b7d89 | 1006 | if (vq->v_usecount == 0) { |
ef62830d KM |
1007 | vgone(vq); |
1008 | goto loop; | |
1009 | } | |
7f7b7d89 | 1010 | count += vq->v_usecount; |
ef62830d KM |
1011 | } |
1012 | return (count); | |
1013 | } | |
0bf84b18 KM |
1014 | |
1015 | /* | |
1016 | * Print out a description of a vnode. | |
1017 | */ | |
1018 | static char *typename[] = | |
61f846a8 | 1019 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1020 | |
1021 | vprint(label, vp) | |
1022 | char *label; | |
1023 | register struct vnode *vp; | |
1024 | { | |
f2f730c6 | 1025 | char buf[64]; |
0bf84b18 KM |
1026 | |
1027 | if (label != NULL) | |
1028 | printf("%s: ", label); | |
3e787e54 | 1029 | printf("num %d ", vp->v_spare[0]); |
65c3b3a8 KM |
1030 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1031 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1032 | vp->v_holdcnt); | |
f2f730c6 KM |
1033 | buf[0] = '\0'; |
1034 | if (vp->v_flag & VROOT) | |
1035 | strcat(buf, "|VROOT"); | |
1036 | if (vp->v_flag & VTEXT) | |
1037 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1038 | if (vp->v_flag & VSYSTEM) |
1039 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1040 | if (vp->v_flag & VXLOCK) |
1041 | strcat(buf, "|VXLOCK"); | |
1042 | if (vp->v_flag & VXWANT) | |
1043 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1044 | if (vp->v_flag & VBWAIT) |
1045 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1046 | if (vp->v_flag & VALIASED) |
1047 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1048 | if (buf[0] != '\0') |
1049 | printf(" flags (%s)", &buf[1]); | |
3fc2ac18 KM |
1050 | if (vp->v_data == NULL) { |
1051 | printf("\n"); | |
1052 | } else { | |
1053 | printf("\n\t"); | |
1054 | VOP_PRINT(vp); | |
1055 | } | |
0bf84b18 | 1056 | } |
985cbdd5 | 1057 | |
34c62e18 KM |
1058 | #ifdef DEBUG |
1059 | /* | |
1060 | * List all of the locked vnodes in the system. | |
1061 | * Called when debugging the kernel. | |
1062 | */ | |
1063 | printlockedvnodes() | |
1064 | { | |
1065 | register struct mount *mp; | |
1066 | register struct vnode *vp; | |
1067 | ||
1068 | printf("Locked vnodes\n"); | |
3fc2ac18 KM |
1069 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
1070 | for (vp = mp->mnt_vnodelist.lh_first; | |
1071 | vp != NULL; | |
1072 | vp = vp->v_mntvnodes.le_next) | |
34c62e18 KM |
1073 | if (VOP_ISLOCKED(vp)) |
1074 | vprint((char *)0, vp); | |
3fc2ac18 | 1075 | } |
34c62e18 KM |
1076 | } |
1077 | #endif | |
1078 | ||
985cbdd5 MT |
1079 | int kinfo_vdebug = 1; |
1080 | int kinfo_vgetfailed; | |
1081 | #define KINFO_VNODESLOP 10 | |
1082 | /* | |
786fb484 | 1083 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1084 | * Copyout address of vnode followed by vnode. |
1085 | */ | |
aacc1bff | 1086 | /* ARGSUSED */ |
786fb484 | 1087 | sysctl_vnode(where, sizep) |
985cbdd5 | 1088 | char *where; |
c1909da4 | 1089 | size_t *sizep; |
985cbdd5 | 1090 | { |
3fc2ac18 | 1091 | register struct mount *mp, *nmp; |
985cbdd5 | 1092 | struct vnode *vp; |
985cbdd5 | 1093 | register char *bp = where, *savebp; |
5bf57294 | 1094 | char *ewhere; |
985cbdd5 MT |
1095 | int error; |
1096 | ||
1097 | #define VPTRSZ sizeof (struct vnode *) | |
1098 | #define VNODESZ sizeof (struct vnode) | |
1099 | if (where == NULL) { | |
786fb484 | 1100 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1101 | return (0); |
1102 | } | |
786fb484 | 1103 | ewhere = where + *sizep; |
985cbdd5 | 1104 | |
3fc2ac18 KM |
1105 | for (mp = mountlist.tqh_first; mp != NULL; mp = nmp) { |
1106 | nmp = mp->mnt_list.tqe_next; | |
1107 | if (vfs_busy(mp)) | |
36ef03ec | 1108 | continue; |
985cbdd5 MT |
1109 | savebp = bp; |
1110 | again: | |
3fc2ac18 KM |
1111 | for (vp = mp->mnt_vnodelist.lh_first; |
1112 | vp != NULL; | |
1113 | vp = vp->v_mntvnodes.le_next) { | |
41185b3b KM |
1114 | /* |
1115 | * Check that the vp is still associated with | |
1116 | * this filesystem. RACE: could have been | |
1117 | * recycled onto the same filesystem. | |
1118 | */ | |
4597dd33 KM |
1119 | if (vp->v_mount != mp) { |
1120 | if (kinfo_vdebug) | |
1121 | printf("kinfo: vp changed\n"); | |
1122 | bp = savebp; | |
1123 | goto again; | |
1124 | } | |
786fb484 KM |
1125 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1126 | *sizep = bp - where; | |
1127 | return (ENOMEM); | |
1128 | } | |
1129 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1130 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1131 | return (error); |
985cbdd5 | 1132 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1133 | } |
3fc2ac18 KM |
1134 | vfs_unbusy(mp); |
1135 | } | |
985cbdd5 | 1136 | |
786fb484 | 1137 | *sizep = bp - where; |
985cbdd5 MT |
1138 | return (0); |
1139 | } |