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. | |
adb35f79 KB |
4 | * (c) UNIX System Laboratories, Inc. |
5 | * All or some portions of this file are derived from material licensed | |
6 | * to the University of California by American Telephone and Telegraph | |
7 | * Co. or Unix System Laboratories, Inc. and are reproduced herein with | |
8 | * the permission of UNIX System Laboratories, Inc. | |
3c4390e8 | 9 | * |
dbf0c423 | 10 | * %sccs.include.redist.c% |
3c4390e8 | 11 | * |
1d2d7c6d | 12 | * @(#)vfs_subr.c 8.12 (Berkeley) %G% |
3c4390e8 KM |
13 | */ |
14 | ||
15 | /* | |
16 | * External virtual filesystem routines | |
17 | */ | |
18 | ||
cb796a23 | 19 | #include <sys/param.h> |
917dc539 | 20 | #include <sys/systm.h> |
cb796a23 KB |
21 | #include <sys/proc.h> |
22 | #include <sys/mount.h> | |
23 | #include <sys/time.h> | |
24 | #include <sys/vnode.h> | |
807cc430 | 25 | #include <sys/stat.h> |
cb796a23 KB |
26 | #include <sys/namei.h> |
27 | #include <sys/ucred.h> | |
28 | #include <sys/buf.h> | |
29 | #include <sys/errno.h> | |
30 | #include <sys/malloc.h> | |
8981e258 MH |
31 | #include <sys/domain.h> |
32 | #include <sys/mbuf.h> | |
3c4390e8 | 33 | |
bb4964fd KM |
34 | #include <vm/vm.h> |
35 | #include <sys/sysctl.h> | |
36 | ||
021de758 JSP |
37 | #include <miscfs/specfs/specdev.h> |
38 | ||
807cc430 KM |
39 | enum vtype iftovt_tab[16] = { |
40 | VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON, | |
41 | VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD, | |
42 | }; | |
43 | int vttoif_tab[9] = { | |
44 | 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, | |
45 | S_IFSOCK, S_IFIFO, S_IFMT, | |
46 | }; | |
47 | ||
e3249ec0 KM |
48 | /* |
49 | * Insq/Remq for the vnode usage lists. | |
50 | */ | |
3fc2ac18 KM |
51 | #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs) |
52 | #define bufremvn(bp) { \ | |
53 | LIST_REMOVE(bp, b_vnbufs); \ | |
54 | (bp)->b_vnbufs.le_next = NOLIST; \ | |
55 | } | |
56 | ||
57 | TAILQ_HEAD(freelst, vnode) vnode_free_list; /* vnode free list */ | |
58 | struct mntlist mountlist; /* mounted filesystem list */ | |
e3249ec0 | 59 | |
3c4390e8 | 60 | /* |
3fc2ac18 | 61 | * Initialize the vnode management data structures. |
3c4390e8 | 62 | */ |
3fc2ac18 | 63 | vntblinit() |
3c4390e8 KM |
64 | { |
65 | ||
3fc2ac18 KM |
66 | TAILQ_INIT(&vnode_free_list); |
67 | TAILQ_INIT(&mountlist); | |
3c4390e8 KM |
68 | } |
69 | ||
70 | /* | |
71 | * Lock a filesystem. | |
72 | * Used to prevent access to it while mounting and unmounting. | |
73 | */ | |
74 | vfs_lock(mp) | |
75 | register struct mount *mp; | |
76 | { | |
77 | ||
54fb9dc2 KM |
78 | while(mp->mnt_flag & MNT_MLOCK) { |
79 | mp->mnt_flag |= MNT_MWAIT; | |
594501df KM |
80 | sleep((caddr_t)mp, PVFS); |
81 | } | |
54fb9dc2 | 82 | mp->mnt_flag |= MNT_MLOCK; |
3c4390e8 KM |
83 | return (0); |
84 | } | |
85 | ||
86 | /* | |
87 | * Unlock a locked filesystem. | |
88 | * Panic if filesystem is not locked. | |
89 | */ | |
90 | void | |
91 | vfs_unlock(mp) | |
92 | register struct mount *mp; | |
93 | { | |
94 | ||
54fb9dc2 | 95 | if ((mp->mnt_flag & MNT_MLOCK) == 0) |
36ef03ec | 96 | panic("vfs_unlock: not locked"); |
54fb9dc2 KM |
97 | mp->mnt_flag &= ~MNT_MLOCK; |
98 | if (mp->mnt_flag & MNT_MWAIT) { | |
99 | mp->mnt_flag &= ~MNT_MWAIT; | |
3c4390e8 KM |
100 | wakeup((caddr_t)mp); |
101 | } | |
102 | } | |
103 | ||
36ef03ec KM |
104 | /* |
105 | * Mark a mount point as busy. | |
106 | * Used to synchronize access and to delay unmounting. | |
107 | */ | |
108 | vfs_busy(mp) | |
109 | register struct mount *mp; | |
110 | { | |
111 | ||
54fb9dc2 KM |
112 | while(mp->mnt_flag & MNT_MPBUSY) { |
113 | mp->mnt_flag |= MNT_MPWANT; | |
114 | sleep((caddr_t)&mp->mnt_flag, PVFS); | |
36ef03ec | 115 | } |
d8b63609 KM |
116 | if (mp->mnt_flag & MNT_UNMOUNT) |
117 | return (1); | |
54fb9dc2 | 118 | mp->mnt_flag |= MNT_MPBUSY; |
36ef03ec KM |
119 | return (0); |
120 | } | |
121 | ||
122 | /* | |
123 | * Free a busy filesystem. | |
124 | * Panic if filesystem is not busy. | |
125 | */ | |
36ef03ec KM |
126 | vfs_unbusy(mp) |
127 | register struct mount *mp; | |
128 | { | |
129 | ||
54fb9dc2 | 130 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 131 | panic("vfs_unbusy: not busy"); |
54fb9dc2 KM |
132 | mp->mnt_flag &= ~MNT_MPBUSY; |
133 | if (mp->mnt_flag & MNT_MPWANT) { | |
134 | mp->mnt_flag &= ~MNT_MPWANT; | |
135 | wakeup((caddr_t)&mp->mnt_flag); | |
36ef03ec KM |
136 | } |
137 | } | |
138 | ||
3c4390e8 KM |
139 | /* |
140 | * Lookup a mount point by filesystem identifier. | |
141 | */ | |
142 | struct mount * | |
143 | getvfs(fsid) | |
144 | fsid_t *fsid; | |
145 | { | |
146 | register struct mount *mp; | |
147 | ||
3fc2ac18 | 148 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
54fb9dc2 | 149 | if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] && |
3fc2ac18 | 150 | mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) |
d713f801 | 151 | return (mp); |
3fc2ac18 | 152 | } |
d713f801 | 153 | return ((struct mount *)0); |
3c4390e8 KM |
154 | } |
155 | ||
917dc539 JSP |
156 | /* |
157 | * Get a new unique fsid | |
158 | */ | |
159 | void | |
160 | getnewfsid(mp, mtype) | |
161 | struct mount *mp; | |
162 | int mtype; | |
163 | { | |
164 | static u_short xxxfs_mntid; | |
165 | ||
166 | fsid_t tfsid; | |
167 | ||
1209b9a4 | 168 | mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0); |
917dc539 JSP |
169 | mp->mnt_stat.f_fsid.val[1] = mtype; |
170 | if (xxxfs_mntid == 0) | |
171 | ++xxxfs_mntid; | |
1209b9a4 | 172 | tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid); |
917dc539 | 173 | tfsid.val[1] = mtype; |
3fc2ac18 | 174 | if (mountlist.tqh_first != NULL) { |
17fd1cc7 JSP |
175 | while (getvfs(&tfsid)) { |
176 | tfsid.val[0]++; | |
177 | xxxfs_mntid++; | |
178 | } | |
917dc539 JSP |
179 | } |
180 | mp->mnt_stat.f_fsid.val[0] = tfsid.val[0]; | |
181 | } | |
182 | ||
3c4390e8 KM |
183 | /* |
184 | * Set vnode attributes to VNOVAL | |
185 | */ | |
186 | void vattr_null(vap) | |
187 | register struct vattr *vap; | |
188 | { | |
189 | ||
190 | vap->va_type = VNON; | |
83504fd5 | 191 | vap->va_size = vap->va_bytes = VNOVAL; |
3c4390e8 | 192 | vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid = |
83504fd5 KM |
193 | vap->va_fsid = vap->va_fileid = |
194 | vap->va_blocksize = vap->va_rdev = | |
ecf75a7d KM |
195 | vap->va_atime.ts_sec = vap->va_atime.ts_nsec = |
196 | vap->va_mtime.ts_sec = vap->va_mtime.ts_nsec = | |
197 | vap->va_ctime.ts_sec = vap->va_ctime.ts_nsec = | |
8cf4d4fb | 198 | vap->va_flags = vap->va_gen = VNOVAL; |
fcba749b | 199 | vap->va_vaflags = 0; |
3c4390e8 | 200 | } |
c60798ca | 201 | |
36d09cb1 KM |
202 | /* |
203 | * Routines having to do with the management of the vnode table. | |
204 | */ | |
9342689a | 205 | extern int (**dead_vnodeop_p)(); |
32339c94 | 206 | extern void vclean(); |
1a80f56e | 207 | long numvnodes; |
e781da98 | 208 | extern struct vattr va_null; |
3e787e54 KM |
209 | int newnodes = 0; |
210 | int printcnt = 0; | |
36d09cb1 KM |
211 | |
212 | /* | |
213 | * Return the next vnode from the free list. | |
214 | */ | |
215 | getnewvnode(tag, mp, vops, vpp) | |
216 | enum vtagtype tag; | |
217 | struct mount *mp; | |
cf74dd57 | 218 | int (**vops)(); |
36d09cb1 KM |
219 | struct vnode **vpp; |
220 | { | |
c768e50f | 221 | register struct vnode *vp; |
1f9d2249 | 222 | int s; |
36d09cb1 | 223 | |
3e787e54 | 224 | newnodes++; |
3fc2ac18 KM |
225 | if ((vnode_free_list.tqh_first == NULL && |
226 | numvnodes < 2 * desiredvnodes) || | |
ecf75a7d | 227 | numvnodes < desiredvnodes) { |
aacc1bff KM |
228 | vp = (struct vnode *)malloc((u_long)sizeof *vp, |
229 | M_VNODE, M_WAITOK); | |
1a80f56e | 230 | bzero((char *)vp, sizeof *vp); |
3e787e54 KM |
231 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
232 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
233 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; | |
234 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
1a80f56e | 235 | numvnodes++; |
3e787e54 | 236 | vp->v_spare[0] = numvnodes; |
1a80f56e | 237 | } else { |
3fc2ac18 | 238 | if ((vp = vnode_free_list.tqh_first) == NULL) { |
1a80f56e KM |
239 | tablefull("vnode"); |
240 | *vpp = 0; | |
241 | return (ENFILE); | |
242 | } | |
243 | if (vp->v_usecount) | |
244 | panic("free vnode isn't"); | |
3e787e54 KM |
245 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf || |
246 | vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb) | |
247 | panic("getnewvnode: not on queue"); | |
3fc2ac18 | 248 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
3e787e54 | 249 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
0bf9bb76 KM |
250 | /* see comment on why 0xdeadb is set at end of vgone (below) */ |
251 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
39b99eb6 | 252 | vp->v_lease = NULL; |
1a80f56e KM |
253 | if (vp->v_type != VBAD) |
254 | vgone(vp); | |
1f9d2249 | 255 | #ifdef DIAGNOSTIC |
2345b093 KM |
256 | if (vp->v_data) |
257 | panic("cleaned vnode isn't"); | |
1f9d2249 MS |
258 | s = splbio(); |
259 | if (vp->v_numoutput) | |
260 | panic("Clean vnode has pending I/O's"); | |
261 | splx(s); | |
262 | #endif | |
1a80f56e | 263 | vp->v_flag = 0; |
1a80f56e | 264 | vp->v_lastr = 0; |
2b5ada11 MH |
265 | vp->v_ralen = 0; |
266 | vp->v_maxra = 0; | |
1f9d2249 MS |
267 | vp->v_lastw = 0; |
268 | vp->v_lasta = 0; | |
269 | vp->v_cstart = 0; | |
270 | vp->v_clen = 0; | |
1a80f56e | 271 | vp->v_socket = 0; |
36d09cb1 | 272 | } |
b027498b | 273 | vp->v_type = VNON; |
36d09cb1 KM |
274 | cache_purge(vp); |
275 | vp->v_tag = tag; | |
ef24f6dd | 276 | vp->v_op = vops; |
36d09cb1 | 277 | insmntque(vp, mp); |
36d09cb1 | 278 | *vpp = vp; |
0bf9bb76 | 279 | vp->v_usecount = 1; |
3fc2ac18 | 280 | vp->v_data = 0; |
3e787e54 | 281 | if (printcnt-- > 0) vprint("getnewvnode got", vp); |
36d09cb1 KM |
282 | return (0); |
283 | } | |
8981e258 | 284 | |
36d09cb1 KM |
285 | /* |
286 | * Move a vnode from one mount queue to another. | |
287 | */ | |
288 | insmntque(vp, mp) | |
289 | register struct vnode *vp; | |
290 | register struct mount *mp; | |
291 | { | |
36d09cb1 KM |
292 | |
293 | /* | |
294 | * Delete from old mount point vnode list, if on one. | |
295 | */ | |
3e787e54 KM |
296 | if (vp->v_mount != NULL) { |
297 | if (vp->v_mntvnodes.le_next == (struct vnode *)0xdeadf || | |
298 | vp->v_mntvnodes.le_prev == (struct vnode **)0xdeadb) | |
299 | panic("insmntque: not on queue"); | |
3fc2ac18 | 300 | LIST_REMOVE(vp, v_mntvnodes); |
3e787e54 KM |
301 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; |
302 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
303 | } | |
36d09cb1 KM |
304 | /* |
305 | * Insert into list of vnodes for the new mount point, if available. | |
306 | */ | |
3fc2ac18 | 307 | if ((vp->v_mount = mp) == NULL) |
36d09cb1 | 308 | return; |
3e787e54 KM |
309 | if (vp->v_mntvnodes.le_next != (struct vnode *)0xdeadf || |
310 | vp->v_mntvnodes.le_prev != (struct vnode **)0xdeadb) | |
311 | panic("insmntque: already on queue"); | |
3fc2ac18 | 312 | LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes); |
36d09cb1 KM |
313 | } |
314 | ||
76429560 KM |
315 | /* |
316 | * Update outstanding I/O count and do wakeup if requested. | |
317 | */ | |
318 | vwakeup(bp) | |
319 | register struct buf *bp; | |
320 | { | |
321 | register struct vnode *vp; | |
322 | ||
a9338fad | 323 | bp->b_flags &= ~B_WRITEINPROG; |
76429560 KM |
324 | if (vp = bp->b_vp) { |
325 | vp->v_numoutput--; | |
1f9d2249 MS |
326 | if (vp->v_numoutput < 0) |
327 | panic("vwakeup: neg numoutput"); | |
76429560 KM |
328 | if ((vp->v_flag & VBWAIT) && vp->v_numoutput <= 0) { |
329 | if (vp->v_numoutput < 0) | |
330 | panic("vwakeup: neg numoutput"); | |
331 | vp->v_flag &= ~VBWAIT; | |
332 | wakeup((caddr_t)&vp->v_numoutput); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
76429560 KM |
337 | /* |
338 | * Flush out and invalidate all buffers associated with a vnode. | |
339 | * Called with the underlying object locked. | |
340 | */ | |
d024c2ce | 341 | int |
c33e9e8b | 342 | vinvalbuf(vp, flags, cred, p, slpflag, slptimeo) |
76429560 | 343 | register struct vnode *vp; |
12079a9d | 344 | int flags; |
d024c2ce KM |
345 | struct ucred *cred; |
346 | struct proc *p; | |
c33e9e8b | 347 | int slpflag, slptimeo; |
76429560 KM |
348 | { |
349 | register struct buf *bp; | |
350 | struct buf *nbp, *blist; | |
d024c2ce | 351 | int s, error; |
76429560 | 352 | |
12079a9d | 353 | if (flags & V_SAVE) { |
d024c2ce KM |
354 | if (error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) |
355 | return (error); | |
3fc2ac18 | 356 | if (vp->v_dirtyblkhd.lh_first != NULL) |
d024c2ce KM |
357 | panic("vinvalbuf: dirty bufs"); |
358 | } | |
76429560 | 359 | for (;;) { |
3fc2ac18 | 360 | if ((blist = vp->v_cleanblkhd.lh_first) && flags & V_SAVEMETA) |
12079a9d | 361 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 KM |
362 | blist = blist->b_vnbufs.le_next; |
363 | if (!blist && (blist = vp->v_dirtyblkhd.lh_first) && | |
e3249ec0 | 364 | (flags & V_SAVEMETA)) |
12079a9d | 365 | while (blist && blist->b_lblkno < 0) |
3fc2ac18 | 366 | blist = blist->b_vnbufs.le_next; |
12079a9d | 367 | if (!blist) |
76429560 | 368 | break; |
12079a9d | 369 | |
76429560 | 370 | for (bp = blist; bp; bp = nbp) { |
3fc2ac18 | 371 | nbp = bp->b_vnbufs.le_next; |
12079a9d MS |
372 | if (flags & V_SAVEMETA && bp->b_lblkno < 0) |
373 | continue; | |
76429560 KM |
374 | s = splbio(); |
375 | if (bp->b_flags & B_BUSY) { | |
376 | bp->b_flags |= B_WANTED; | |
c33e9e8b KM |
377 | error = tsleep((caddr_t)bp, |
378 | slpflag | (PRIBIO + 1), "vinvalbuf", | |
379 | slptimeo); | |
76429560 | 380 | splx(s); |
c33e9e8b KM |
381 | if (error) |
382 | return (error); | |
76429560 KM |
383 | break; |
384 | } | |
385 | bremfree(bp); | |
386 | bp->b_flags |= B_BUSY; | |
387 | splx(s); | |
c33e9e8b KM |
388 | /* |
389 | * XXX Since there are no node locks for NFS, I believe | |
390 | * there is a slight chance that a delayed write will | |
391 | * occur while sleeping just above, so check for it. | |
392 | */ | |
393 | if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) { | |
394 | (void) VOP_BWRITE(bp); | |
395 | break; | |
396 | } | |
12079a9d | 397 | bp->b_flags |= B_INVAL; |
76429560 KM |
398 | brelse(bp); |
399 | } | |
400 | } | |
e3249ec0 | 401 | if (!(flags & V_SAVEMETA) && |
3fc2ac18 | 402 | (vp->v_dirtyblkhd.lh_first || vp->v_cleanblkhd.lh_first)) |
76429560 | 403 | panic("vinvalbuf: flush failed"); |
d024c2ce | 404 | return (0); |
76429560 KM |
405 | } |
406 | ||
407 | /* | |
408 | * Associate a buffer with a vnode. | |
409 | */ | |
410 | bgetvp(vp, bp) | |
411 | register struct vnode *vp; | |
412 | register struct buf *bp; | |
413 | { | |
414 | ||
415 | if (bp->b_vp) | |
416 | panic("bgetvp: not free"); | |
417 | VHOLD(vp); | |
418 | bp->b_vp = vp; | |
419 | if (vp->v_type == VBLK || vp->v_type == VCHR) | |
420 | bp->b_dev = vp->v_rdev; | |
421 | else | |
422 | bp->b_dev = NODEV; | |
423 | /* | |
424 | * Insert onto list for new vnode. | |
425 | */ | |
e3249ec0 | 426 | bufinsvn(bp, &vp->v_cleanblkhd); |
76429560 KM |
427 | } |
428 | ||
429 | /* | |
430 | * Disassociate a buffer from a vnode. | |
431 | */ | |
432 | brelvp(bp) | |
433 | register struct buf *bp; | |
434 | { | |
76429560 KM |
435 | struct vnode *vp; |
436 | ||
437 | if (bp->b_vp == (struct vnode *) 0) | |
438 | panic("brelvp: NULL"); | |
439 | /* | |
440 | * Delete from old vnode list, if on one. | |
441 | */ | |
3fc2ac18 | 442 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 443 | bufremvn(bp); |
76429560 KM |
444 | vp = bp->b_vp; |
445 | bp->b_vp = (struct vnode *) 0; | |
446 | HOLDRELE(vp); | |
447 | } | |
448 | ||
449 | /* | |
450 | * Reassign a buffer from one vnode to another. | |
451 | * Used to assign file specific control information | |
452 | * (indirect blocks) to the vnode to which they belong. | |
453 | */ | |
454 | reassignbuf(bp, newvp) | |
455 | register struct buf *bp; | |
456 | register struct vnode *newvp; | |
457 | { | |
3fc2ac18 | 458 | register struct buflists *listheadp; |
76429560 | 459 | |
e5c3f16e KM |
460 | if (newvp == NULL) { |
461 | printf("reassignbuf: NULL"); | |
462 | return; | |
463 | } | |
76429560 KM |
464 | /* |
465 | * Delete from old vnode list, if on one. | |
466 | */ | |
3fc2ac18 | 467 | if (bp->b_vnbufs.le_next != NOLIST) |
e3249ec0 | 468 | bufremvn(bp); |
76429560 KM |
469 | /* |
470 | * If dirty, put on list of dirty buffers; | |
471 | * otherwise insert onto list of clean buffers. | |
472 | */ | |
473 | if (bp->b_flags & B_DELWRI) | |
474 | listheadp = &newvp->v_dirtyblkhd; | |
475 | else | |
476 | listheadp = &newvp->v_cleanblkhd; | |
e3249ec0 | 477 | bufinsvn(bp, listheadp); |
76429560 KM |
478 | } |
479 | ||
36d09cb1 | 480 | /* |
ef24f6dd KM |
481 | * Create a vnode for a block device. |
482 | * Used for root filesystem, argdev, and swap areas. | |
483 | * Also used for memory file system special devices. | |
484 | */ | |
485 | bdevvp(dev, vpp) | |
486 | dev_t dev; | |
487 | struct vnode **vpp; | |
488 | { | |
ef24f6dd KM |
489 | register struct vnode *vp; |
490 | struct vnode *nvp; | |
491 | int error; | |
492 | ||
1c89915d KM |
493 | if (dev == NODEV) |
494 | return (0); | |
9342689a | 495 | error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp); |
ef24f6dd KM |
496 | if (error) { |
497 | *vpp = 0; | |
498 | return (error); | |
499 | } | |
500 | vp = nvp; | |
501 | vp->v_type = VBLK; | |
c0de8792 | 502 | if (nvp = checkalias(vp, dev, (struct mount *)0)) { |
ef24f6dd KM |
503 | vput(vp); |
504 | vp = nvp; | |
505 | } | |
506 | *vpp = vp; | |
507 | return (0); | |
508 | } | |
509 | ||
510 | /* | |
511 | * Check to see if the new vnode represents a special device | |
512 | * for which we already have a vnode (either because of | |
513 | * bdevvp() or because of a different vnode representing | |
514 | * the same block device). If such an alias exists, deallocate | |
f0556f86 | 515 | * the existing contents and return the aliased vnode. The |
ef24f6dd KM |
516 | * caller is responsible for filling it with its new contents. |
517 | */ | |
518 | struct vnode * | |
c0de8792 | 519 | checkalias(nvp, nvp_rdev, mp) |
ef24f6dd | 520 | register struct vnode *nvp; |
c0de8792 | 521 | dev_t nvp_rdev; |
ef24f6dd KM |
522 | struct mount *mp; |
523 | { | |
524 | register struct vnode *vp; | |
c0de8792 | 525 | struct vnode **vpp; |
ef24f6dd KM |
526 | |
527 | if (nvp->v_type != VBLK && nvp->v_type != VCHR) | |
54fb9dc2 | 528 | return (NULLVP); |
c0de8792 KM |
529 | |
530 | vpp = &speclisth[SPECHASH(nvp_rdev)]; | |
ef24f6dd | 531 | loop: |
c0de8792 KM |
532 | for (vp = *vpp; vp; vp = vp->v_specnext) { |
533 | if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) | |
ef24f6dd | 534 | continue; |
c0de8792 KM |
535 | /* |
536 | * Alias, but not in use, so flush it out. | |
537 | */ | |
7f7b7d89 | 538 | if (vp->v_usecount == 0) { |
c0de8792 KM |
539 | vgone(vp); |
540 | goto loop; | |
541 | } | |
3fc2ac18 | 542 | if (vget(vp, 1)) |
ef62830d | 543 | goto loop; |
ef24f6dd KM |
544 | break; |
545 | } | |
c0de8792 | 546 | if (vp == NULL || vp->v_tag != VT_NON) { |
c0de8792 KM |
547 | MALLOC(nvp->v_specinfo, struct specinfo *, |
548 | sizeof(struct specinfo), M_VNODE, M_WAITOK); | |
549 | nvp->v_rdev = nvp_rdev; | |
7f7b7d89 | 550 | nvp->v_hashchain = vpp; |
c0de8792 | 551 | nvp->v_specnext = *vpp; |
2c957a90 | 552 | nvp->v_specflags = 0; |
c0de8792 | 553 | *vpp = nvp; |
40452d5e KM |
554 | if (vp != NULL) { |
555 | nvp->v_flag |= VALIASED; | |
556 | vp->v_flag |= VALIASED; | |
557 | vput(vp); | |
558 | } | |
54fb9dc2 | 559 | return (NULLVP); |
ef24f6dd | 560 | } |
2bae1875 KM |
561 | VOP_UNLOCK(vp); |
562 | vclean(vp, 0); | |
ef24f6dd KM |
563 | vp->v_op = nvp->v_op; |
564 | vp->v_tag = nvp->v_tag; | |
565 | nvp->v_type = VNON; | |
566 | insmntque(vp, mp); | |
567 | return (vp); | |
568 | } | |
569 | ||
570 | /* | |
571 | * Grab a particular vnode from the free list, increment its | |
572 | * reference count and lock it. The vnode lock bit is set the | |
573 | * vnode is being eliminated in vgone. The process is awakened | |
574 | * when the transition is completed, and an error returned to | |
575 | * indicate that the vnode is no longer usable (possibly having | |
576 | * been changed to a new file system type). | |
36d09cb1 | 577 | */ |
3fc2ac18 | 578 | vget(vp, lockflag) |
36d09cb1 | 579 | register struct vnode *vp; |
3fc2ac18 | 580 | int lockflag; |
36d09cb1 | 581 | { |
36d09cb1 | 582 | |
ef24f6dd KM |
583 | if (vp->v_flag & VXLOCK) { |
584 | vp->v_flag |= VXWANT; | |
585 | sleep((caddr_t)vp, PINOD); | |
586 | return (1); | |
587 | } | |
3e787e54 KM |
588 | if (vp->v_usecount == 0) { |
589 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf || | |
590 | vp->v_freelist.tqe_prev == (struct vnode **)0xdeadb) | |
591 | panic("vget: not on queue"); | |
3fc2ac18 | 592 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
70f7fdbe | 593 | } |
3e787e54 KM |
594 | vp->v_freelist.tqe_next = (struct vnode *)0xdeadf; |
595 | vp->v_freelist.tqe_prev = (struct vnode **)0xdeadb; | |
596 | } | |
ec04fc59 | 597 | vp->v_usecount++; |
3fc2ac18 KM |
598 | if (lockflag) |
599 | VOP_LOCK(vp); | |
3e787e54 | 600 | if (printcnt-- > 0) vprint("vget got", vp); |
ef24f6dd | 601 | return (0); |
36d09cb1 KM |
602 | } |
603 | ||
d32390ea KM |
604 | int bug_refs = 0; |
605 | ||
36d09cb1 KM |
606 | /* |
607 | * Vnode reference, just increment the count | |
608 | */ | |
609 | void vref(vp) | |
610 | struct vnode *vp; | |
611 | { | |
612 | ||
ec04fc59 KM |
613 | if (vp->v_usecount <= 0) |
614 | panic("vref used where vget required"); | |
3e787e54 KM |
615 | if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf || |
616 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) | |
617 | panic("vref: not free"); | |
7f7b7d89 | 618 | vp->v_usecount++; |
3e787e54 | 619 | if (printcnt-- > 0) vprint("vref get", vp); |
d32390ea KM |
620 | if (vp->v_type != VBLK && curproc) |
621 | curproc->p_spare[0]++; | |
622 | if (bug_refs) | |
623 | vprint("vref: "); | |
36d09cb1 KM |
624 | } |
625 | ||
626 | /* | |
627 | * vput(), just unlock and vrele() | |
628 | */ | |
629 | void vput(vp) | |
630 | register struct vnode *vp; | |
631 | { | |
4d1ee2eb | 632 | |
36d09cb1 KM |
633 | VOP_UNLOCK(vp); |
634 | vrele(vp); | |
635 | } | |
636 | ||
637 | /* | |
638 | * Vnode release. | |
639 | * If count drops to zero, call inactive routine and return to freelist. | |
640 | */ | |
641 | void vrele(vp) | |
642 | register struct vnode *vp; | |
643 | { | |
644 | ||
65c3b3a8 | 645 | #ifdef DIAGNOSTIC |
36d09cb1 | 646 | if (vp == NULL) |
ef24f6dd | 647 | panic("vrele: null vp"); |
65c3b3a8 | 648 | #endif |
7f7b7d89 | 649 | vp->v_usecount--; |
3e787e54 | 650 | if (printcnt-- > 0) vprint("vrele put", vp); |
d32390ea KM |
651 | if (vp->v_type != VBLK && curproc) |
652 | curproc->p_spare[0]--; | |
653 | if (bug_refs) | |
654 | vprint("vref: "); | |
7f7b7d89 | 655 | if (vp->v_usecount > 0) |
36d09cb1 | 656 | return; |
65c3b3a8 KM |
657 | #ifdef DIAGNOSTIC |
658 | if (vp->v_usecount != 0 || vp->v_writecount != 0) { | |
659 | vprint("vrele: bad ref count", vp); | |
660 | panic("vrele: ref cnt"); | |
661 | } | |
662 | #endif | |
dc998e72 KM |
663 | /* |
664 | * insert at tail of LRU list | |
665 | */ | |
3e787e54 KM |
666 | if (vp->v_freelist.tqe_next != (struct vnode *)0xdeadf || |
667 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb) | |
668 | panic("vrele: not free"); | |
3fc2ac18 | 669 | TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist); |
d024c2ce | 670 | VOP_INACTIVE(vp); |
ef24f6dd KM |
671 | } |
672 | ||
7f7b7d89 KM |
673 | /* |
674 | * Page or buffer structure gets a reference. | |
675 | */ | |
451df175 | 676 | void vhold(vp) |
7f7b7d89 KM |
677 | register struct vnode *vp; |
678 | { | |
679 | ||
680 | vp->v_holdcnt++; | |
681 | } | |
682 | ||
683 | /* | |
684 | * Page or buffer structure frees a reference. | |
685 | */ | |
451df175 | 686 | void holdrele(vp) |
7f7b7d89 KM |
687 | register struct vnode *vp; |
688 | { | |
689 | ||
690 | if (vp->v_holdcnt <= 0) | |
691 | panic("holdrele: holdcnt"); | |
692 | vp->v_holdcnt--; | |
693 | } | |
694 | ||
f0556f86 KM |
695 | /* |
696 | * Remove any vnodes in the vnode table belonging to mount point mp. | |
697 | * | |
698 | * If MNT_NOFORCE is specified, there should not be any active ones, | |
699 | * return error if any are found (nb: this is a user error, not a | |
700 | * system error). If MNT_FORCE is specified, detach any active vnodes | |
701 | * that are found. | |
702 | */ | |
8981e258 | 703 | #ifdef DIAGNOSTIC |
bb4964fd KM |
704 | int busyprt = 0; /* print out busy vnodes */ |
705 | struct ctldebug debug1 = { "busyprt", &busyprt }; | |
8981e258 | 706 | #endif |
f0556f86 KM |
707 | |
708 | vflush(mp, skipvp, flags) | |
709 | struct mount *mp; | |
710 | struct vnode *skipvp; | |
711 | int flags; | |
712 | { | |
713 | register struct vnode *vp, *nvp; | |
714 | int busy = 0; | |
715 | ||
54fb9dc2 | 716 | if ((mp->mnt_flag & MNT_MPBUSY) == 0) |
36ef03ec | 717 | panic("vflush: not busy"); |
4597dd33 | 718 | loop: |
3fc2ac18 | 719 | for (vp = mp->mnt_vnodelist.lh_first; vp; vp = nvp) { |
4597dd33 KM |
720 | if (vp->v_mount != mp) |
721 | goto loop; | |
3fc2ac18 | 722 | nvp = vp->v_mntvnodes.le_next; |
f0556f86 KM |
723 | /* |
724 | * Skip over a selected vnode. | |
f0556f86 KM |
725 | */ |
726 | if (vp == skipvp) | |
727 | continue; | |
36ef03ec KM |
728 | /* |
729 | * Skip over a vnodes marked VSYSTEM. | |
730 | */ | |
731 | if ((flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) | |
732 | continue; | |
da374605 KM |
733 | /* |
734 | * If WRITECLOSE is set, only flush out regular file | |
735 | * vnodes open for writing. | |
736 | */ | |
737 | if ((flags & WRITECLOSE) && | |
738 | (vp->v_writecount == 0 || vp->v_type != VREG)) | |
739 | continue; | |
f0556f86 | 740 | /* |
7f7b7d89 | 741 | * With v_usecount == 0, all we need to do is clear |
f0556f86 KM |
742 | * out the vnode data structures and we are done. |
743 | */ | |
7f7b7d89 | 744 | if (vp->v_usecount == 0) { |
f0556f86 KM |
745 | vgone(vp); |
746 | continue; | |
747 | } | |
748 | /* | |
da374605 | 749 | * If FORCECLOSE is set, forcibly close the vnode. |
f0556f86 KM |
750 | * For block or character devices, revert to an |
751 | * anonymous device. For all other files, just kill them. | |
752 | */ | |
36ef03ec | 753 | if (flags & FORCECLOSE) { |
f0556f86 KM |
754 | if (vp->v_type != VBLK && vp->v_type != VCHR) { |
755 | vgone(vp); | |
756 | } else { | |
757 | vclean(vp, 0); | |
9342689a | 758 | vp->v_op = spec_vnodeop_p; |
f0556f86 KM |
759 | insmntque(vp, (struct mount *)0); |
760 | } | |
761 | continue; | |
762 | } | |
8981e258 | 763 | #ifdef DIAGNOSTIC |
f0556f86 | 764 | if (busyprt) |
0bf84b18 | 765 | vprint("vflush: busy vnode", vp); |
8981e258 | 766 | #endif |
f0556f86 KM |
767 | busy++; |
768 | } | |
769 | if (busy) | |
770 | return (EBUSY); | |
771 | return (0); | |
772 | } | |
773 | ||
ef24f6dd KM |
774 | /* |
775 | * Disassociate the underlying file system from a vnode. | |
ef24f6dd | 776 | */ |
ecf75a7d KM |
777 | void |
778 | vclean(vp, flags) | |
ef24f6dd | 779 | register struct vnode *vp; |
aacc1bff | 780 | int flags; |
ef24f6dd | 781 | { |
2bae1875 | 782 | int active; |
ef24f6dd | 783 | |
2bae1875 KM |
784 | /* |
785 | * Check to see if the vnode is in use. | |
0bf84b18 KM |
786 | * If so we have to reference it before we clean it out |
787 | * so that its count cannot fall to zero and generate a | |
788 | * race against ourselves to recycle it. | |
2bae1875 | 789 | */ |
7f7b7d89 | 790 | if (active = vp->v_usecount) |
2bae1875 | 791 | VREF(vp); |
669df1aa KM |
792 | /* |
793 | * Even if the count is zero, the VOP_INACTIVE routine may still | |
794 | * have the object locked while it cleans it out. The VOP_LOCK | |
795 | * ensures that the VOP_INACTIVE routine is done with its work. | |
796 | * For active vnodes, it ensures that no other activity can | |
797 | * occur while the underlying object is being cleaned out. | |
798 | */ | |
799 | VOP_LOCK(vp); | |
2bae1875 KM |
800 | /* |
801 | * Prevent the vnode from being recycled or | |
802 | * brought into use while we clean it out. | |
803 | */ | |
0bf84b18 KM |
804 | if (vp->v_flag & VXLOCK) |
805 | panic("vclean: deadlock"); | |
ef24f6dd | 806 | vp->v_flag |= VXLOCK; |
0bf84b18 | 807 | /* |
669df1aa | 808 | * Clean out any buffers associated with the vnode. |
0bf84b18 | 809 | */ |
36ef03ec | 810 | if (flags & DOCLOSE) |
c33e9e8b | 811 | vinvalbuf(vp, V_SAVE, NOCRED, NULL, 0, 0); |
ef24f6dd | 812 | /* |
669df1aa KM |
813 | * Any other processes trying to obtain this lock must first |
814 | * wait for VXLOCK to clear, then call the new lock operation. | |
ef24f6dd | 815 | */ |
669df1aa | 816 | VOP_UNLOCK(vp); |
ef24f6dd | 817 | /* |
669df1aa KM |
818 | * If purging an active vnode, it must be closed and |
819 | * deactivated before being reclaimed. | |
ef24f6dd | 820 | */ |
2bae1875 | 821 | if (active) { |
669df1aa KM |
822 | if (flags & DOCLOSE) |
823 | VOP_CLOSE(vp, IO_NDELAY, NOCRED, NULL); | |
824 | VOP_INACTIVE(vp); | |
ef24f6dd KM |
825 | } |
826 | /* | |
827 | * Reclaim the vnode. | |
828 | */ | |
669df1aa | 829 | if (VOP_RECLAIM(vp)) |
ef24f6dd | 830 | panic("vclean: cannot reclaim"); |
2bae1875 KM |
831 | if (active) |
832 | vrele(vp); | |
38c46eee | 833 | |
ef24f6dd | 834 | /* |
669df1aa | 835 | * Done with purge, notify sleepers of the grim news. |
ef24f6dd | 836 | */ |
669df1aa KM |
837 | vp->v_op = dead_vnodeop_p; |
838 | vp->v_tag = VT_NON; | |
ef24f6dd KM |
839 | vp->v_flag &= ~VXLOCK; |
840 | if (vp->v_flag & VXWANT) { | |
841 | vp->v_flag &= ~VXWANT; | |
842 | wakeup((caddr_t)vp); | |
843 | } | |
844 | } | |
845 | ||
ef62830d KM |
846 | /* |
847 | * Eliminate all activity associated with the requested vnode | |
848 | * and with all vnodes aliased to the requested vnode. | |
849 | */ | |
850 | void vgoneall(vp) | |
851 | register struct vnode *vp; | |
852 | { | |
7f7b7d89 | 853 | register struct vnode *vq; |
ef62830d | 854 | |
7a7b3a95 KM |
855 | if (vp->v_flag & VALIASED) { |
856 | /* | |
857 | * If a vgone (or vclean) is already in progress, | |
858 | * wait until it is done and return. | |
859 | */ | |
860 | if (vp->v_flag & VXLOCK) { | |
861 | vp->v_flag |= VXWANT; | |
862 | sleep((caddr_t)vp, PINOD); | |
863 | return; | |
864 | } | |
865 | /* | |
866 | * Ensure that vp will not be vgone'd while we | |
867 | * are eliminating its aliases. | |
868 | */ | |
869 | vp->v_flag |= VXLOCK; | |
870 | while (vp->v_flag & VALIASED) { | |
871 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
872 | if (vq->v_rdev != vp->v_rdev || | |
873 | vq->v_type != vp->v_type || vp == vq) | |
874 | continue; | |
875 | vgone(vq); | |
876 | break; | |
877 | } | |
ef62830d | 878 | } |
7a7b3a95 KM |
879 | /* |
880 | * Remove the lock so that vgone below will | |
881 | * really eliminate the vnode after which time | |
882 | * vgone will awaken any sleepers. | |
883 | */ | |
884 | vp->v_flag &= ~VXLOCK; | |
ef62830d KM |
885 | } |
886 | vgone(vp); | |
887 | } | |
888 | ||
ef24f6dd KM |
889 | /* |
890 | * Eliminate all activity associated with a vnode | |
891 | * in preparation for reuse. | |
892 | */ | |
893 | void vgone(vp) | |
894 | register struct vnode *vp; | |
895 | { | |
7f7b7d89 | 896 | register struct vnode *vq; |
c0de8792 | 897 | struct vnode *vx; |
ef24f6dd | 898 | |
4f55e3ec KM |
899 | /* |
900 | * If a vgone (or vclean) is already in progress, | |
901 | * wait until it is done and return. | |
902 | */ | |
903 | if (vp->v_flag & VXLOCK) { | |
904 | vp->v_flag |= VXWANT; | |
905 | sleep((caddr_t)vp, PINOD); | |
906 | return; | |
907 | } | |
ef24f6dd KM |
908 | /* |
909 | * Clean out the filesystem specific data. | |
910 | */ | |
36ef03ec | 911 | vclean(vp, DOCLOSE); |
ef24f6dd KM |
912 | /* |
913 | * Delete from old mount point vnode list, if on one. | |
914 | */ | |
3fc2ac18 | 915 | if (vp->v_mount != NULL) { |
3e787e54 KM |
916 | if (vp->v_mntvnodes.le_next == (struct vnode *)0xdeadf || |
917 | vp->v_mntvnodes.le_prev == (struct vnode **)0xdeadb) | |
918 | panic("vgone: not on queue"); | |
3fc2ac18 | 919 | LIST_REMOVE(vp, v_mntvnodes); |
3e787e54 KM |
920 | vp->v_mntvnodes.le_next = (struct vnode *)0xdeadf; |
921 | vp->v_mntvnodes.le_prev = (struct vnode **)0xdeadb; | |
d10e9258 | 922 | vp->v_mount = NULL; |
ef24f6dd KM |
923 | } |
924 | /* | |
925 | * If special device, remove it from special device alias list. | |
926 | */ | |
927 | if (vp->v_type == VBLK || vp->v_type == VCHR) { | |
7f7b7d89 KM |
928 | if (*vp->v_hashchain == vp) { |
929 | *vp->v_hashchain = vp->v_specnext; | |
ef24f6dd | 930 | } else { |
7f7b7d89 | 931 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
c0de8792 | 932 | if (vq->v_specnext != vp) |
ef24f6dd | 933 | continue; |
c0de8792 | 934 | vq->v_specnext = vp->v_specnext; |
ef24f6dd KM |
935 | break; |
936 | } | |
c0de8792 | 937 | if (vq == NULL) |
ef24f6dd KM |
938 | panic("missing bdev"); |
939 | } | |
c0de8792 | 940 | if (vp->v_flag & VALIASED) { |
4d1ee2eb | 941 | vx = NULL; |
7f7b7d89 | 942 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { |
de81e10c KM |
943 | if (vq->v_rdev != vp->v_rdev || |
944 | vq->v_type != vp->v_type) | |
c0de8792 | 945 | continue; |
4d1ee2eb CT |
946 | if (vx) |
947 | break; | |
c0de8792 KM |
948 | vx = vq; |
949 | } | |
4d1ee2eb | 950 | if (vx == NULL) |
c0de8792 | 951 | panic("missing alias"); |
4d1ee2eb | 952 | if (vq == NULL) |
c0de8792 KM |
953 | vx->v_flag &= ~VALIASED; |
954 | vp->v_flag &= ~VALIASED; | |
955 | } | |
956 | FREE(vp->v_specinfo, M_VNODE); | |
957 | vp->v_specinfo = NULL; | |
ef24f6dd KM |
958 | } |
959 | /* | |
3387ef89 | 960 | * If it is on the freelist and not already at the head, |
0bf9bb76 KM |
961 | * move it to the head of the list. The test of the back |
962 | * pointer and the reference count of zero is because | |
963 | * it will be removed from the free list by getnewvnode, | |
964 | * but will not have its reference count incremented until | |
965 | * after calling vgone. If the reference count were | |
966 | * incremented first, vgone would (incorrectly) try to | |
967 | * close the previous instance of the underlying object. | |
968 | * So, the back pointer is explicitly set to `0xdeadb' in | |
969 | * getnewvnode after removing it from the freelist to ensure | |
970 | * that we do not try to move it here. | |
ef24f6dd | 971 | */ |
0bf9bb76 KM |
972 | if (vp->v_usecount == 0 && |
973 | vp->v_freelist.tqe_prev != (struct vnode **)0xdeadb && | |
974 | vnode_free_list.tqh_first != vp) { | |
3e787e54 KM |
975 | if (vp->v_freelist.tqe_next == (struct vnode *)0xdeadf) |
976 | panic("vgone: use 0, not free"); | |
3fc2ac18 KM |
977 | TAILQ_REMOVE(&vnode_free_list, vp, v_freelist); |
978 | TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist); | |
ef24f6dd | 979 | } |
2bae1875 | 980 | vp->v_type = VBAD; |
36d09cb1 | 981 | } |
ef62830d | 982 | |
2bcd6066 KM |
983 | /* |
984 | * Lookup a vnode by device number. | |
985 | */ | |
986 | vfinddev(dev, type, vpp) | |
987 | dev_t dev; | |
988 | enum vtype type; | |
989 | struct vnode **vpp; | |
990 | { | |
991 | register struct vnode *vp; | |
992 | ||
993 | for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) { | |
994 | if (dev != vp->v_rdev || type != vp->v_type) | |
995 | continue; | |
996 | *vpp = vp; | |
05378ee4 | 997 | return (1); |
2bcd6066 | 998 | } |
05378ee4 | 999 | return (0); |
2bcd6066 KM |
1000 | } |
1001 | ||
ef62830d KM |
1002 | /* |
1003 | * Calculate the total number of references to a special device. | |
1004 | */ | |
1005 | vcount(vp) | |
1006 | register struct vnode *vp; | |
1007 | { | |
1d2d7c6d | 1008 | register struct vnode *vq, *vnext; |
ef62830d KM |
1009 | int count; |
1010 | ||
1d2d7c6d | 1011 | loop: |
ef62830d | 1012 | if ((vp->v_flag & VALIASED) == 0) |
7f7b7d89 | 1013 | return (vp->v_usecount); |
1d2d7c6d KM |
1014 | for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) { |
1015 | vnext = vq->v_specnext; | |
de81e10c | 1016 | if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type) |
ef62830d KM |
1017 | continue; |
1018 | /* | |
1019 | * Alias, but not in use, so flush it out. | |
1020 | */ | |
1d2d7c6d | 1021 | if (vq->v_usecount == 0 && vq != vp) { |
ef62830d KM |
1022 | vgone(vq); |
1023 | goto loop; | |
1024 | } | |
7f7b7d89 | 1025 | count += vq->v_usecount; |
ef62830d KM |
1026 | } |
1027 | return (count); | |
1028 | } | |
0bf84b18 KM |
1029 | |
1030 | /* | |
1031 | * Print out a description of a vnode. | |
1032 | */ | |
1033 | static char *typename[] = | |
61f846a8 | 1034 | { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" }; |
0bf84b18 KM |
1035 | |
1036 | vprint(label, vp) | |
1037 | char *label; | |
1038 | register struct vnode *vp; | |
1039 | { | |
f2f730c6 | 1040 | char buf[64]; |
0bf84b18 KM |
1041 | |
1042 | if (label != NULL) | |
1043 | printf("%s: ", label); | |
3e787e54 | 1044 | printf("num %d ", vp->v_spare[0]); |
65c3b3a8 KM |
1045 | printf("type %s, usecount %d, writecount %d, refcount %d,", |
1046 | typename[vp->v_type], vp->v_usecount, vp->v_writecount, | |
1047 | vp->v_holdcnt); | |
f2f730c6 KM |
1048 | buf[0] = '\0'; |
1049 | if (vp->v_flag & VROOT) | |
1050 | strcat(buf, "|VROOT"); | |
1051 | if (vp->v_flag & VTEXT) | |
1052 | strcat(buf, "|VTEXT"); | |
36ef03ec KM |
1053 | if (vp->v_flag & VSYSTEM) |
1054 | strcat(buf, "|VSYSTEM"); | |
36ef03ec KM |
1055 | if (vp->v_flag & VXLOCK) |
1056 | strcat(buf, "|VXLOCK"); | |
1057 | if (vp->v_flag & VXWANT) | |
1058 | strcat(buf, "|VXWANT"); | |
f2f730c6 KM |
1059 | if (vp->v_flag & VBWAIT) |
1060 | strcat(buf, "|VBWAIT"); | |
36ef03ec KM |
1061 | if (vp->v_flag & VALIASED) |
1062 | strcat(buf, "|VALIASED"); | |
f2f730c6 KM |
1063 | if (buf[0] != '\0') |
1064 | printf(" flags (%s)", &buf[1]); | |
3fc2ac18 KM |
1065 | if (vp->v_data == NULL) { |
1066 | printf("\n"); | |
1067 | } else { | |
1068 | printf("\n\t"); | |
1069 | VOP_PRINT(vp); | |
1070 | } | |
0bf84b18 | 1071 | } |
985cbdd5 | 1072 | |
34c62e18 KM |
1073 | #ifdef DEBUG |
1074 | /* | |
1075 | * List all of the locked vnodes in the system. | |
1076 | * Called when debugging the kernel. | |
1077 | */ | |
1078 | printlockedvnodes() | |
1079 | { | |
1080 | register struct mount *mp; | |
1081 | register struct vnode *vp; | |
1082 | ||
1083 | printf("Locked vnodes\n"); | |
3fc2ac18 KM |
1084 | for (mp = mountlist.tqh_first; mp != NULL; mp = mp->mnt_list.tqe_next) { |
1085 | for (vp = mp->mnt_vnodelist.lh_first; | |
1086 | vp != NULL; | |
1087 | vp = vp->v_mntvnodes.le_next) | |
34c62e18 KM |
1088 | if (VOP_ISLOCKED(vp)) |
1089 | vprint((char *)0, vp); | |
3fc2ac18 | 1090 | } |
34c62e18 KM |
1091 | } |
1092 | #endif | |
1093 | ||
985cbdd5 MT |
1094 | int kinfo_vdebug = 1; |
1095 | int kinfo_vgetfailed; | |
1096 | #define KINFO_VNODESLOP 10 | |
1097 | /* | |
786fb484 | 1098 | * Dump vnode list (via sysctl). |
985cbdd5 MT |
1099 | * Copyout address of vnode followed by vnode. |
1100 | */ | |
aacc1bff | 1101 | /* ARGSUSED */ |
786fb484 | 1102 | sysctl_vnode(where, sizep) |
985cbdd5 | 1103 | char *where; |
c1909da4 | 1104 | size_t *sizep; |
985cbdd5 | 1105 | { |
3fc2ac18 | 1106 | register struct mount *mp, *nmp; |
985cbdd5 | 1107 | struct vnode *vp; |
985cbdd5 | 1108 | register char *bp = where, *savebp; |
5bf57294 | 1109 | char *ewhere; |
985cbdd5 MT |
1110 | int error; |
1111 | ||
1112 | #define VPTRSZ sizeof (struct vnode *) | |
1113 | #define VNODESZ sizeof (struct vnode) | |
1114 | if (where == NULL) { | |
786fb484 | 1115 | *sizep = (numvnodes + KINFO_VNODESLOP) * (VPTRSZ + VNODESZ); |
985cbdd5 MT |
1116 | return (0); |
1117 | } | |
786fb484 | 1118 | ewhere = where + *sizep; |
985cbdd5 | 1119 | |
3fc2ac18 KM |
1120 | for (mp = mountlist.tqh_first; mp != NULL; mp = nmp) { |
1121 | nmp = mp->mnt_list.tqe_next; | |
1122 | if (vfs_busy(mp)) | |
36ef03ec | 1123 | continue; |
985cbdd5 MT |
1124 | savebp = bp; |
1125 | again: | |
3fc2ac18 KM |
1126 | for (vp = mp->mnt_vnodelist.lh_first; |
1127 | vp != NULL; | |
1128 | vp = vp->v_mntvnodes.le_next) { | |
41185b3b KM |
1129 | /* |
1130 | * Check that the vp is still associated with | |
1131 | * this filesystem. RACE: could have been | |
1132 | * recycled onto the same filesystem. | |
1133 | */ | |
4597dd33 KM |
1134 | if (vp->v_mount != mp) { |
1135 | if (kinfo_vdebug) | |
1136 | printf("kinfo: vp changed\n"); | |
1137 | bp = savebp; | |
1138 | goto again; | |
1139 | } | |
786fb484 KM |
1140 | if (bp + VPTRSZ + VNODESZ > ewhere) { |
1141 | *sizep = bp - where; | |
1142 | return (ENOMEM); | |
1143 | } | |
1144 | if ((error = copyout((caddr_t)&vp, bp, VPTRSZ)) || | |
1145 | (error = copyout((caddr_t)vp, bp + VPTRSZ, VNODESZ))) | |
985cbdd5 | 1146 | return (error); |
985cbdd5 | 1147 | bp += VPTRSZ + VNODESZ; |
985cbdd5 | 1148 | } |
3fc2ac18 KM |
1149 | vfs_unbusy(mp); |
1150 | } | |
985cbdd5 | 1151 | |
786fb484 | 1152 | *sizep = bp - where; |
985cbdd5 MT |
1153 | return (0); |
1154 | } | |
8981e258 MH |
1155 | |
1156 | /* | |
1157 | * Check to see if a filesystem is mounted on a block device. | |
1158 | */ | |
1159 | int | |
1160 | vfs_mountedon(vp) | |
1161 | register struct vnode *vp; | |
1162 | { | |
1163 | register struct vnode *vq; | |
1164 | ||
1165 | if (vp->v_specflags & SI_MOUNTEDON) | |
1166 | return (EBUSY); | |
1167 | if (vp->v_flag & VALIASED) { | |
1168 | for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) { | |
1169 | if (vq->v_rdev != vp->v_rdev || | |
1170 | vq->v_type != vp->v_type) | |
1171 | continue; | |
1172 | if (vq->v_specflags & SI_MOUNTEDON) | |
1173 | return (EBUSY); | |
1174 | } | |
1175 | } | |
1176 | return (0); | |
1177 | } | |
1178 | ||
1179 | /* | |
1180 | * Build hash lists of net addresses and hang them off the mount point. | |
1181 | * Called by ufs_mount() to set up the lists of export addresses. | |
1182 | */ | |
1183 | static int | |
1184 | vfs_hang_addrlist(mp, nep, argp) | |
1185 | struct mount *mp; | |
1186 | struct netexport *nep; | |
1187 | struct export_args *argp; | |
1188 | { | |
1189 | register struct netcred *np; | |
1190 | register struct radix_node_head *rnh; | |
1191 | register int i; | |
1192 | struct radix_node *rn; | |
1193 | struct sockaddr *saddr, *smask = 0; | |
1194 | struct domain *dom; | |
1195 | int error; | |
1196 | ||
1197 | if (argp->ex_addrlen == 0) { | |
1198 | if (mp->mnt_flag & MNT_DEFEXPORTED) | |
1199 | return (EPERM); | |
1200 | np = &nep->ne_defexported; | |
1201 | np->netc_exflags = argp->ex_flags; | |
1202 | np->netc_anon = argp->ex_anon; | |
1203 | np->netc_anon.cr_ref = 1; | |
1204 | mp->mnt_flag |= MNT_DEFEXPORTED; | |
1205 | return (0); | |
1206 | } | |
1207 | i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen; | |
1208 | np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK); | |
1209 | bzero((caddr_t)np, i); | |
1210 | saddr = (struct sockaddr *)(np + 1); | |
1211 | if (error = copyin(argp->ex_addr, (caddr_t)saddr, argp->ex_addrlen)) | |
1212 | goto out; | |
1213 | if (saddr->sa_len > argp->ex_addrlen) | |
1214 | saddr->sa_len = argp->ex_addrlen; | |
1215 | if (argp->ex_masklen) { | |
1216 | smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen); | |
1217 | error = copyin(argp->ex_addr, (caddr_t)smask, argp->ex_masklen); | |
1218 | if (error) | |
1219 | goto out; | |
1220 | if (smask->sa_len > argp->ex_masklen) | |
1221 | smask->sa_len = argp->ex_masklen; | |
1222 | } | |
1223 | i = saddr->sa_family; | |
1224 | if ((rnh = nep->ne_rtable[i]) == 0) { | |
1225 | /* | |
1226 | * Seems silly to initialize every AF when most are not | |
1227 | * used, do so on demand here | |
1228 | */ | |
1229 | for (dom = domains; dom; dom = dom->dom_next) | |
1230 | if (dom->dom_family == i && dom->dom_rtattach) { | |
1231 | dom->dom_rtattach((void **)&nep->ne_rtable[i], | |
1232 | dom->dom_rtoffset); | |
1233 | break; | |
1234 | } | |
1235 | if ((rnh = nep->ne_rtable[i]) == 0) { | |
1236 | error = ENOBUFS; | |
1237 | goto out; | |
1238 | } | |
1239 | } | |
1240 | rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh, | |
1241 | np->netc_rnodes); | |
1242 | if (rn == 0 || np != (struct netcred *)rn) { /* already exists */ | |
1243 | error = EPERM; | |
1244 | goto out; | |
1245 | } | |
1246 | np->netc_exflags = argp->ex_flags; | |
1247 | np->netc_anon = argp->ex_anon; | |
1248 | np->netc_anon.cr_ref = 1; | |
1249 | return (0); | |
1250 | out: | |
1251 | free(np, M_NETADDR); | |
1252 | return (error); | |
1253 | } | |
1254 | ||
1255 | /* ARGSUSED */ | |
1256 | static int | |
1257 | vfs_free_netcred(rn, w) | |
1258 | struct radix_node *rn; | |
1259 | caddr_t w; | |
1260 | { | |
1261 | register struct radix_node_head *rnh = (struct radix_node_head *)w; | |
1262 | ||
1263 | (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh); | |
1264 | free((caddr_t)rn, M_NETADDR); | |
1265 | return (0); | |
1266 | } | |
1267 | ||
1268 | /* | |
1269 | * Free the net address hash lists that are hanging off the mount points. | |
1270 | */ | |
1271 | static void | |
1272 | vfs_free_addrlist(nep) | |
1273 | struct netexport *nep; | |
1274 | { | |
1275 | register int i; | |
1276 | register struct radix_node_head *rnh; | |
1277 | ||
1278 | for (i = 0; i <= AF_MAX; i++) | |
1279 | if (rnh = nep->ne_rtable[i]) { | |
1280 | (*rnh->rnh_walktree)(rnh, vfs_free_netcred, | |
1281 | (caddr_t)rnh); | |
1282 | free((caddr_t)rnh, M_RTABLE); | |
1283 | nep->ne_rtable[i] = 0; | |
1284 | } | |
1285 | } | |
1286 | ||
1287 | int | |
1288 | vfs_export(mp, nep, argp) | |
1289 | struct mount *mp; | |
1290 | struct netexport *nep; | |
1291 | struct export_args *argp; | |
1292 | { | |
1293 | int error; | |
1294 | ||
1295 | if (argp->ex_flags & MNT_DELEXPORT) { | |
1296 | vfs_free_addrlist(nep); | |
1297 | mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED); | |
1298 | } | |
1299 | if (argp->ex_flags & MNT_EXPORTED) { | |
1300 | if (error = vfs_hang_addrlist(mp, nep, argp)) | |
1301 | return (error); | |
1302 | mp->mnt_flag |= MNT_EXPORTED; | |
1303 | } | |
1304 | return (0); | |
1305 | } | |
1306 | ||
1307 | struct netcred * | |
1308 | vfs_export_lookup(mp, nep, nam) | |
1309 | register struct mount *mp; | |
1310 | struct netexport *nep; | |
1311 | struct mbuf *nam; | |
1312 | { | |
1313 | register struct netcred *np; | |
1314 | register struct radix_node_head *rnh; | |
1315 | struct sockaddr *saddr; | |
1316 | ||
1317 | np = NULL; | |
1318 | if (mp->mnt_flag & MNT_EXPORTED) { | |
1319 | /* | |
1320 | * Lookup in the export list first. | |
1321 | */ | |
1322 | if (nam != NULL) { | |
1323 | saddr = mtod(nam, struct sockaddr *); | |
1324 | rnh = nep->ne_rtable[saddr->sa_family]; | |
1325 | if (rnh != NULL) { | |
1326 | np = (struct netcred *) | |
1327 | (*rnh->rnh_matchaddr)((caddr_t)saddr, | |
1328 | rnh); | |
1329 | if (np && np->netc_rnodes->rn_flags & RNF_ROOT) | |
1330 | np = NULL; | |
1331 | } | |
1332 | } | |
1333 | /* | |
1334 | * If no address match, use the default if it exists. | |
1335 | */ | |
1336 | if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED) | |
1337 | np = &nep->ne_defexported; | |
1338 | } | |
1339 | return (np); | |
1340 | } |