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1.1 nbrk 1: /* $OpenBSD: vfs_subr.c,v 1.155 2007/08/07 04:32:45 beck Exp $ */
2: /* $NetBSD: vfs_subr.c,v 1.53 1996/04/22 01:39:13 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1989, 1993
6: * The Regents of the University of California. All rights reserved.
7: * (c) UNIX System Laboratories, Inc.
8: * All or some portions of this file are derived from material licensed
9: * to the University of California by American Telephone and Telegraph
10: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11: * the permission of UNIX System Laboratories, Inc.
12: *
13: * Redistribution and use in source and binary forms, with or without
14: * modification, are permitted provided that the following conditions
15: * are met:
16: * 1. Redistributions of source code must retain the above copyright
17: * notice, this list of conditions and the following disclaimer.
18: * 2. Redistributions in binary form must reproduce the above copyright
19: * notice, this list of conditions and the following disclaimer in the
20: * documentation and/or other materials provided with the distribution.
21: * 3. Neither the name of the University nor the names of its contributors
22: * may be used to endorse or promote products derived from this software
23: * without specific prior written permission.
24: *
25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35: * SUCH DAMAGE.
36: *
37: * @(#)vfs_subr.c 8.13 (Berkeley) 4/18/94
38: */
39:
40: /*
41: * External virtual filesystem routines
42: */
43:
44: #include <sys/param.h>
45: #include <sys/systm.h>
46: #include <sys/proc.h>
47: #include <sys/mount.h>
48: #include <sys/time.h>
49: #include <sys/fcntl.h>
50: #include <sys/kernel.h>
51: #include <sys/vnode.h>
52: #include <sys/stat.h>
53: #include <sys/namei.h>
54: #include <sys/ucred.h>
55: #include <sys/buf.h>
56: #include <sys/errno.h>
57: #include <sys/malloc.h>
58: #include <sys/domain.h>
59: #include <sys/mbuf.h>
60: #include <sys/syscallargs.h>
61: #include <sys/pool.h>
62:
63: #include <uvm/uvm_extern.h>
64: #include <sys/sysctl.h>
65:
66: #include <miscfs/specfs/specdev.h>
67:
68: enum vtype iftovt_tab[16] = {
69: VNON, VFIFO, VCHR, VNON, VDIR, VNON, VBLK, VNON,
70: VREG, VNON, VLNK, VNON, VSOCK, VNON, VNON, VBAD,
71: };
72:
73: int vttoif_tab[9] = {
74: 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK,
75: S_IFSOCK, S_IFIFO, S_IFMT,
76: };
77:
78: int doforce = 1; /* 1 => permit forcible unmounting */
79: int prtactive = 0; /* 1 => print out reclaim of active vnodes */
80: int suid_clear = 1; /* 1 => clear SUID / SGID on owner change */
81:
82: /*
83: * Insq/Remq for the vnode usage lists.
84: */
85: #define bufinsvn(bp, dp) LIST_INSERT_HEAD(dp, bp, b_vnbufs)
86: #define bufremvn(bp) { \
87: LIST_REMOVE(bp, b_vnbufs); \
88: LIST_NEXT(bp, b_vnbufs) = NOLIST; \
89: }
90:
91: struct freelst vnode_hold_list; /* list of vnodes referencing buffers */
92: struct freelst vnode_free_list; /* vnode free list */
93:
94: struct mntlist mountlist; /* mounted filesystem list */
95:
96: void vclean(struct vnode *, int, struct proc *);
97:
98: void insmntque(struct vnode *, struct mount *);
99: int getdevvp(dev_t, struct vnode **, enum vtype);
100:
101: int vfs_hang_addrlist(struct mount *, struct netexport *,
102: struct export_args *);
103: int vfs_free_netcred(struct radix_node *, void *);
104: void vfs_free_addrlist(struct netexport *);
105: void vputonfreelist(struct vnode *);
106:
107: int vflush_vnode(struct vnode *, void *);
108: int maxvnodes;
109:
110: #ifdef DEBUG
111: void printlockedvnodes(void);
112: #endif
113:
114: struct pool vnode_pool;
115:
116: /*
117: * Initialize the vnode management data structures.
118: */
119: void
120: vntblinit(void)
121: {
122: /* buffer cache may need a vnode for each buffer */
123: maxvnodes = desiredvnodes;
124: pool_init(&vnode_pool, sizeof(struct vnode), 0, 0, 0, "vnodes",
125: &pool_allocator_nointr);
126: TAILQ_INIT(&vnode_hold_list);
127: TAILQ_INIT(&vnode_free_list);
128: CIRCLEQ_INIT(&mountlist);
129: /*
130: * Initialize the filesystem syncer.
131: */
132: vn_initialize_syncerd();
133: }
134:
135: /*
136: * Mark a mount point as busy. Used to synchronize access and to delay
137: * unmounting.
138: *
139: * Default behaviour is to attempt getting a READ lock and in case of an
140: * ongoing unmount, to wait for it to finish and then return failure.
141: */
142: int
143: vfs_busy(struct mount *mp, int flags)
144: {
145: int rwflags = 0;
146:
147: /* new mountpoints need their lock initialised */
148: if (mp->mnt_lock.rwl_name == NULL)
149: rw_init(&mp->mnt_lock, "vfslock");
150:
151: if (flags & VB_WRITE)
152: rwflags |= RW_WRITE;
153: else
154: rwflags |= RW_READ;
155:
156: if (flags & VB_WAIT)
157: rwflags |= RW_SLEEPFAIL;
158: else
159: rwflags |= RW_NOSLEEP;
160:
161: if (rw_enter(&mp->mnt_lock, rwflags))
162: return (EBUSY);
163:
164: return (0);
165: }
166:
167: /*
168: * Free a busy file system
169: */
170: void
171: vfs_unbusy(struct mount *mp)
172: {
173: rw_exit(&mp->mnt_lock);
174: }
175:
176: int
177: vfs_isbusy(struct mount *mp)
178: {
179: if (RWLOCK_OWNER(&mp->mnt_lock) > 0)
180: return (1);
181: else
182: return (0);
183: }
184:
185: /*
186: * Lookup a filesystem type, and if found allocate and initialize
187: * a mount structure for it.
188: *
189: * Devname is usually updated by mount(8) after booting.
190: */
191: int
192: vfs_rootmountalloc(char *fstypename, char *devname, struct mount **mpp)
193: {
194: struct vfsconf *vfsp;
195: struct mount *mp;
196:
197: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
198: if (!strcmp(vfsp->vfc_name, fstypename))
199: break;
200: if (vfsp == NULL)
201: return (ENODEV);
202: mp = malloc(sizeof(struct mount), M_MOUNT, M_WAITOK);
203: bzero(mp, sizeof(struct mount));
204: (void)vfs_busy(mp, VB_READ|VB_NOWAIT);
205: LIST_INIT(&mp->mnt_vnodelist);
206: mp->mnt_vfc = vfsp;
207: mp->mnt_op = vfsp->vfc_vfsops;
208: mp->mnt_flag = MNT_RDONLY;
209: mp->mnt_vnodecovered = NULLVP;
210: vfsp->vfc_refcount++;
211: mp->mnt_flag |= vfsp->vfc_flags & MNT_VISFLAGMASK;
212: strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
213: mp->mnt_stat.f_mntonname[0] = '/';
214: (void)copystr(devname, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, 0);
215: *mpp = mp;
216: return (0);
217: }
218:
219: /*
220: * Find an appropriate filesystem to use for the root. If a filesystem
221: * has not been preselected, walk through the list of known filesystems
222: * trying those that have mountroot routines, and try them until one
223: * works or we have tried them all.
224: */
225: int
226: vfs_mountroot(void)
227: {
228: struct vfsconf *vfsp;
229: int error;
230:
231: if (mountroot != NULL)
232: return ((*mountroot)());
233: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
234: if (vfsp->vfc_mountroot == NULL)
235: continue;
236: if ((error = (*vfsp->vfc_mountroot)()) == 0)
237: return (0);
238: printf("%s_mountroot failed: %d\n", vfsp->vfc_name, error);
239: }
240: return (ENODEV);
241: }
242:
243: /*
244: * Lookup a mount point by filesystem identifier.
245: */
246: struct mount *
247: vfs_getvfs(fsid_t *fsid)
248: {
249: struct mount *mp;
250:
251: CIRCLEQ_FOREACH(mp, &mountlist, mnt_list) {
252: if (mp->mnt_stat.f_fsid.val[0] == fsid->val[0] &&
253: mp->mnt_stat.f_fsid.val[1] == fsid->val[1]) {
254: return (mp);
255: }
256: }
257:
258: return (NULL);
259: }
260:
261:
262: /*
263: * Get a new unique fsid
264: */
265: void
266: vfs_getnewfsid(struct mount *mp)
267: {
268: static u_short xxxfs_mntid;
269:
270: fsid_t tfsid;
271: int mtype;
272:
273: mtype = mp->mnt_vfc->vfc_typenum;
274: mp->mnt_stat.f_fsid.val[0] = makedev(nblkdev + mtype, 0);
275: mp->mnt_stat.f_fsid.val[1] = mtype;
276: if (xxxfs_mntid == 0)
277: ++xxxfs_mntid;
278: tfsid.val[0] = makedev(nblkdev + mtype, xxxfs_mntid);
279: tfsid.val[1] = mtype;
280: if (!CIRCLEQ_EMPTY(&mountlist)) {
281: while (vfs_getvfs(&tfsid)) {
282: tfsid.val[0]++;
283: xxxfs_mntid++;
284: }
285: }
286: mp->mnt_stat.f_fsid.val[0] = tfsid.val[0];
287: }
288:
289: /*
290: * Make a 'unique' number from a mount type name.
291: * Note that this is no longer used for ffs which
292: * now has an on-disk filesystem id.
293: */
294: long
295: makefstype(char *type)
296: {
297: long rv;
298:
299: for (rv = 0; *type; type++) {
300: rv <<= 2;
301: rv ^= *type;
302: }
303: return rv;
304: }
305:
306: /*
307: * Set vnode attributes to VNOVAL
308: */
309: void
310: vattr_null(struct vattr *vap)
311: {
312:
313: vap->va_type = VNON;
314: /* XXX These next two used to be one line, but for a GCC bug. */
315: vap->va_size = VNOVAL;
316: vap->va_bytes = VNOVAL;
317: vap->va_mode = vap->va_nlink = vap->va_uid = vap->va_gid =
318: vap->va_fsid = vap->va_fileid =
319: vap->va_blocksize = vap->va_rdev =
320: vap->va_atime.tv_sec = vap->va_atime.tv_nsec =
321: vap->va_mtime.tv_sec = vap->va_mtime.tv_nsec =
322: vap->va_ctime.tv_sec = vap->va_ctime.tv_nsec =
323: vap->va_flags = vap->va_gen = VNOVAL;
324: vap->va_vaflags = 0;
325: }
326:
327: /*
328: * Routines having to do with the management of the vnode table.
329: */
330: extern int (**dead_vnodeop_p)(void *);
331: long numvnodes;
332:
333: /*
334: * Return the next vnode from the free list.
335: */
336: int
337: getnewvnode(enum vtagtype tag, struct mount *mp, int (**vops)(void *),
338: struct vnode **vpp)
339: {
340: struct proc *p = curproc;
341: struct freelst *listhd;
342: static int toggle;
343: struct vnode *vp;
344: int s;
345:
346: /*
347: * We must choose whether to allocate a new vnode or recycle an
348: * existing one. The criterion for allocating a new one is that
349: * the total number of vnodes is less than the number desired or
350: * there are no vnodes on either free list. Generally we only
351: * want to recycle vnodes that have no buffers associated with
352: * them, so we look first on the vnode_free_list. If it is empty,
353: * we next consider vnodes with referencing buffers on the
354: * vnode_hold_list. The toggle ensures that half the time we
355: * will use a buffer from the vnode_hold_list, and half the time
356: * we will allocate a new one unless the list has grown to twice
357: * the desired size. We are reticent to recycle vnodes from the
358: * vnode_hold_list because we will lose the identity of all its
359: * referencing buffers.
360: */
361: toggle ^= 1;
362: if (numvnodes > 2 * maxvnodes)
363: toggle = 0;
364:
365: s = splbio();
366: if ((numvnodes < maxvnodes) ||
367: ((TAILQ_FIRST(listhd = &vnode_free_list) == NULL) &&
368: ((TAILQ_FIRST(listhd = &vnode_hold_list) == NULL) || toggle))) {
369: splx(s);
370: vp = pool_get(&vnode_pool, PR_WAITOK);
371: bzero((char *)vp, sizeof *vp);
372: numvnodes++;
373: } else {
374: for (vp = TAILQ_FIRST(listhd); vp != NULLVP;
375: vp = TAILQ_NEXT(vp, v_freelist)) {
376: if (VOP_ISLOCKED(vp) == 0)
377: break;
378: }
379: /*
380: * Unless this is a bad time of the month, at most
381: * the first NCPUS items on the free list are
382: * locked, so this is close enough to being empty.
383: */
384: if (vp == NULL) {
385: splx(s);
386: tablefull("vnode");
387: *vpp = 0;
388: return (ENFILE);
389: }
390:
391: #ifdef DIAGNOSTIC
392: if (vp->v_usecount) {
393: vprint("free vnode", vp);
394: panic("free vnode isn't");
395: }
396: #endif
397:
398: TAILQ_REMOVE(listhd, vp, v_freelist);
399: vp->v_bioflag &= ~VBIOONFREELIST;
400: splx(s);
401:
402: if (vp->v_type != VBAD)
403: vgonel(vp, p);
404: #ifdef DIAGNOSTIC
405: if (vp->v_data) {
406: vprint("cleaned vnode", vp);
407: panic("cleaned vnode isn't");
408: }
409: s = splbio();
410: if (vp->v_numoutput)
411: panic("Clean vnode has pending I/O's");
412: splx(s);
413: #endif
414: vp->v_flag = 0;
415: vp->v_socket = 0;
416: }
417: vp->v_type = VNON;
418: cache_purge(vp);
419: vp->v_tag = tag;
420: vp->v_op = vops;
421: insmntque(vp, mp);
422: *vpp = vp;
423: vp->v_usecount = 1;
424: vp->v_data = 0;
425: simple_lock_init(&vp->v_uvm.u_obj.vmobjlock);
426: return (0);
427: }
428:
429: /*
430: * Move a vnode from one mount queue to another.
431: */
432: void
433: insmntque(struct vnode *vp, struct mount *mp)
434: {
435: /*
436: * Delete from old mount point vnode list, if on one.
437: */
438: if (vp->v_mount != NULL)
439: LIST_REMOVE(vp, v_mntvnodes);
440: /*
441: * Insert into list of vnodes for the new mount point, if available.
442: */
443: if ((vp->v_mount = mp) != NULL)
444: LIST_INSERT_HEAD(&mp->mnt_vnodelist, vp, v_mntvnodes);
445: }
446:
447: /*
448: * Create a vnode for a block device.
449: * Used for root filesystem, argdev, and swap areas.
450: * Also used for memory file system special devices.
451: */
452: int
453: bdevvp(dev_t dev, struct vnode **vpp)
454: {
455: return (getdevvp(dev, vpp, VBLK));
456: }
457:
458: /*
459: * Create a vnode for a character device.
460: * Used for console handling.
461: */
462: int
463: cdevvp(dev_t dev, struct vnode **vpp)
464: {
465: return (getdevvp(dev, vpp, VCHR));
466: }
467:
468: /*
469: * Create a vnode for a device.
470: * Used by bdevvp (block device) for root file system etc.,
471: * and by cdevvp (character device) for console.
472: */
473: int
474: getdevvp(dev_t dev, struct vnode **vpp, enum vtype type)
475: {
476: struct vnode *vp;
477: struct vnode *nvp;
478: int error;
479:
480: if (dev == NODEV) {
481: *vpp = NULLVP;
482: return (0);
483: }
484: error = getnewvnode(VT_NON, NULL, spec_vnodeop_p, &nvp);
485: if (error) {
486: *vpp = NULLVP;
487: return (error);
488: }
489: vp = nvp;
490: vp->v_type = type;
491: if ((nvp = checkalias(vp, dev, NULL)) != 0) {
492: vput(vp);
493: vp = nvp;
494: }
495: *vpp = vp;
496: return (0);
497: }
498:
499: /*
500: * Check to see if the new vnode represents a special device
501: * for which we already have a vnode (either because of
502: * bdevvp() or because of a different vnode representing
503: * the same block device). If such an alias exists, deallocate
504: * the existing contents and return the aliased vnode. The
505: * caller is responsible for filling it with its new contents.
506: */
507: struct vnode *
508: checkalias(struct vnode *nvp, dev_t nvp_rdev, struct mount *mp)
509: {
510: struct proc *p = curproc;
511: struct vnode *vp;
512: struct vnode **vpp;
513:
514: if (nvp->v_type != VBLK && nvp->v_type != VCHR)
515: return (NULLVP);
516:
517: vpp = &speclisth[SPECHASH(nvp_rdev)];
518: loop:
519: for (vp = *vpp; vp; vp = vp->v_specnext) {
520: if (nvp_rdev != vp->v_rdev || nvp->v_type != vp->v_type) {
521: continue;
522: }
523: /*
524: * Alias, but not in use, so flush it out.
525: */
526: if (vp->v_usecount == 0) {
527: vgonel(vp, p);
528: goto loop;
529: }
530: if (vget(vp, LK_EXCLUSIVE, p)) {
531: goto loop;
532: }
533: break;
534: }
535:
536: /*
537: * Common case is actually in the if statement
538: */
539: if (vp == NULL || !(vp->v_tag == VT_NON && vp->v_type == VBLK)) {
540: MALLOC(nvp->v_specinfo, struct specinfo *,
541: sizeof(struct specinfo), M_VNODE, M_WAITOK);
542: nvp->v_rdev = nvp_rdev;
543: nvp->v_hashchain = vpp;
544: nvp->v_specnext = *vpp;
545: nvp->v_specmountpoint = NULL;
546: nvp->v_speclockf = NULL;
547: bzero(nvp->v_specbitmap, sizeof(nvp->v_specbitmap));
548: *vpp = nvp;
549: if (vp != NULLVP) {
550: nvp->v_flag |= VALIASED;
551: vp->v_flag |= VALIASED;
552: vput(vp);
553: }
554: return (NULLVP);
555: }
556:
557: /*
558: * This code is the uncommon case. It is called in case
559: * we found an alias that was VT_NON && vtype of VBLK
560: * This means we found a block device that was created
561: * using bdevvp.
562: * An example of such a vnode is the root partition device vnode
563: * created in ffs_mountroot.
564: *
565: * The vnodes created by bdevvp should not be aliased (why?).
566: */
567:
568: VOP_UNLOCK(vp, 0, p);
569: vclean(vp, 0, p);
570: vp->v_op = nvp->v_op;
571: vp->v_tag = nvp->v_tag;
572: nvp->v_type = VNON;
573: insmntque(vp, mp);
574: return (vp);
575: }
576:
577: /*
578: * Grab a particular vnode from the free list, increment its
579: * reference count and lock it. If the vnode lock bit is set,
580: * the vnode is being eliminated in vgone. In that case, we
581: * cannot grab it, so the process is awakened when the
582: * transition is completed, and an error code is returned to
583: * indicate that the vnode is no longer usable, possibly
584: * having been changed to a new file system type.
585: */
586: int
587: vget(struct vnode *vp, int flags, struct proc *p)
588: {
589: int error, s, onfreelist;
590:
591: /*
592: * If the vnode is in the process of being cleaned out for
593: * another use, we wait for the cleaning to finish and then
594: * return failure. Cleaning is determined by checking that
595: * the VXLOCK flag is set.
596: */
597:
598: if (vp->v_flag & VXLOCK) {
599: if (flags & LK_NOWAIT) {
600: return (EBUSY);
601: }
602:
603: vp->v_flag |= VXWANT;
604: ltsleep(vp, PINOD | PNORELOCK, "vget", 0, NULL);
605: return (ENOENT);
606: }
607:
608: onfreelist = vp->v_bioflag & VBIOONFREELIST;
609: if (vp->v_usecount == 0 && onfreelist) {
610: s = splbio();
611: if (vp->v_holdcnt > 0)
612: TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
613: else
614: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
615: vp->v_bioflag &= ~VBIOONFREELIST;
616: splx(s);
617: }
618:
619: vp->v_usecount++;
620: if (flags & LK_TYPE_MASK) {
621: if ((error = vn_lock(vp, flags, p)) != 0) {
622: vp->v_usecount--;
623: if (vp->v_usecount == 0 && onfreelist)
624: vputonfreelist(vp);
625: }
626: return (error);
627: }
628:
629: return (0);
630: }
631:
632:
633: /* Vnode reference. */
634: void
635: vref(struct vnode *vp)
636: {
637: #ifdef DIAGNOSTIC
638: if (vp->v_usecount == 0)
639: panic("vref used where vget required");
640: #endif
641: vp->v_usecount++;
642: }
643:
644: void
645: vputonfreelist(struct vnode *vp)
646: {
647: int s;
648: struct freelst *lst;
649:
650: s = splbio();
651: #ifdef DIAGNOSTIC
652: if (vp->v_usecount != 0)
653: panic("Use count is not zero!");
654:
655: if (vp->v_bioflag & VBIOONFREELIST) {
656: vprint("vnode already on free list: ", vp);
657: panic("vnode already on free list");
658: }
659: #endif
660:
661: vp->v_bioflag |= VBIOONFREELIST;
662:
663: if (vp->v_holdcnt > 0)
664: lst = &vnode_hold_list;
665: else
666: lst = &vnode_free_list;
667:
668: if (vp->v_type == VBAD)
669: TAILQ_INSERT_HEAD(lst, vp, v_freelist);
670: else
671: TAILQ_INSERT_TAIL(lst, vp, v_freelist);
672:
673: splx(s);
674: }
675:
676: /*
677: * vput(), just unlock and vrele()
678: */
679: void
680: vput(struct vnode *vp)
681: {
682: struct proc *p = curproc;
683:
684: #ifdef DIAGNOSTIC
685: if (vp == NULL)
686: panic("vput: null vp");
687: #endif
688:
689: #ifdef DIAGNOSTIC
690: if (vp->v_usecount == 0) {
691: vprint("vput: bad ref count", vp);
692: panic("vput: ref cnt");
693: }
694: #endif
695: vp->v_usecount--;
696: if (vp->v_usecount > 0) {
697: VOP_UNLOCK(vp, 0, p);
698: return;
699: }
700:
701: #ifdef DIAGNOSTIC
702: if (vp->v_writecount != 0) {
703: vprint("vput: bad writecount", vp);
704: panic("vput: v_writecount != 0");
705: }
706: #endif
707:
708: VOP_INACTIVE(vp, p);
709:
710: if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST))
711: vputonfreelist(vp);
712: }
713:
714: /*
715: * Vnode release - use for active VNODES.
716: * If count drops to zero, call inactive routine and return to freelist.
717: */
718: void
719: vrele(struct vnode *vp)
720: {
721: struct proc *p = curproc;
722:
723: #ifdef DIAGNOSTIC
724: if (vp == NULL)
725: panic("vrele: null vp");
726: #endif
727: #ifdef DIAGNOSTIC
728: if (vp->v_usecount == 0) {
729: vprint("vrele: bad ref count", vp);
730: panic("vrele: ref cnt");
731: }
732: #endif
733: vp->v_usecount--;
734: if (vp->v_usecount > 0) {
735: return;
736: }
737:
738: #ifdef DIAGNOSTIC
739: if (vp->v_writecount != 0) {
740: vprint("vrele: bad writecount", vp);
741: panic("vrele: v_writecount != 0");
742: }
743: #endif
744:
745: if (vn_lock(vp, LK_EXCLUSIVE, p)) {
746: #ifdef DIAGNOSTIC
747: vprint("vrele: cannot lock", vp);
748: #endif
749: return;
750: }
751:
752: VOP_INACTIVE(vp, p);
753:
754: if (vp->v_usecount == 0 && !(vp->v_bioflag & VBIOONFREELIST))
755: vputonfreelist(vp);
756: }
757:
758: void vhold(struct vnode *vp);
759:
760: /*
761: * Page or buffer structure gets a reference.
762: */
763: void
764: vhold(struct vnode *vp)
765: {
766: /*
767: * If it is on the freelist and the hold count is currently
768: * zero, move it to the hold list.
769: */
770: if ((vp->v_bioflag & VBIOONFREELIST) &&
771: vp->v_holdcnt == 0 && vp->v_usecount == 0) {
772: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
773: TAILQ_INSERT_TAIL(&vnode_hold_list, vp, v_freelist);
774: }
775: vp->v_holdcnt++;
776: }
777:
778: /*
779: * Remove any vnodes in the vnode table belonging to mount point mp.
780: *
781: * If MNT_NOFORCE is specified, there should not be any active ones,
782: * return error if any are found (nb: this is a user error, not a
783: * system error). If MNT_FORCE is specified, detach any active vnodes
784: * that are found.
785: */
786: #ifdef DEBUG
787: int busyprt = 0; /* print out busy vnodes */
788: struct ctldebug debug1 = { "busyprt", &busyprt };
789: #endif
790:
791: int
792: vfs_mount_foreach_vnode(struct mount *mp,
793: int (*func)(struct vnode *, void *), void *arg) {
794: struct vnode *vp, *nvp;
795: int error = 0;
796:
797: loop:
798: for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL; vp = nvp) {
799: if (vp->v_mount != mp)
800: goto loop;
801: nvp = LIST_NEXT(vp, v_mntvnodes);
802:
803: error = func(vp, arg);
804:
805: if (error != 0)
806: break;
807: }
808:
809: return (error);
810: }
811:
812: struct vflush_args {
813: struct vnode *skipvp;
814: int busy;
815: int flags;
816: };
817:
818: int
819: vflush_vnode(struct vnode *vp, void *arg) {
820: struct vflush_args *va = arg;
821: struct proc *p = curproc;
822:
823: if (vp == va->skipvp) {
824: return (0);
825: }
826:
827: if ((va->flags & SKIPSYSTEM) && (vp->v_flag & VSYSTEM)) {
828: return (0);
829: }
830:
831: /*
832: * If WRITECLOSE is set, only flush out regular file
833: * vnodes open for writing.
834: */
835: if ((va->flags & WRITECLOSE) &&
836: (vp->v_writecount == 0 || vp->v_type != VREG)) {
837: return (0);
838: }
839:
840: /*
841: * With v_usecount == 0, all we need to do is clear
842: * out the vnode data structures and we are done.
843: */
844: if (vp->v_usecount == 0) {
845: vgonel(vp, p);
846: return (0);
847: }
848:
849: /*
850: * If FORCECLOSE is set, forcibly close the vnode.
851: * For block or character devices, revert to an
852: * anonymous device. For all other files, just kill them.
853: */
854: if (va->flags & FORCECLOSE) {
855: if (vp->v_type != VBLK && vp->v_type != VCHR) {
856: vgonel(vp, p);
857: } else {
858: vclean(vp, 0, p);
859: vp->v_op = spec_vnodeop_p;
860: insmntque(vp, (struct mount *)0);
861: }
862: return (0);
863: }
864:
865: #ifdef DEBUG
866: if (busyprt)
867: vprint("vflush: busy vnode", vp);
868: #endif
869: va->busy++;
870: return (0);
871: }
872:
873: int
874: vflush(struct mount *mp, struct vnode *skipvp, int flags)
875: {
876: struct vflush_args va;
877: va.skipvp = skipvp;
878: va.busy = 0;
879: va.flags = flags;
880:
881: vfs_mount_foreach_vnode(mp, vflush_vnode, &va);
882:
883: if (va.busy)
884: return (EBUSY);
885: return (0);
886: }
887:
888: /*
889: * Disassociate the underlying file system from a vnode.
890: */
891: void
892: vclean(struct vnode *vp, int flags, struct proc *p)
893: {
894: int active;
895:
896: /*
897: * Check to see if the vnode is in use.
898: * If so we have to reference it before we clean it out
899: * so that its count cannot fall to zero and generate a
900: * race against ourselves to recycle it.
901: */
902: if ((active = vp->v_usecount) != 0)
903: vp->v_usecount++;
904:
905: /*
906: * Prevent the vnode from being recycled or
907: * brought into use while we clean it out.
908: */
909: if (vp->v_flag & VXLOCK)
910: panic("vclean: deadlock");
911: vp->v_flag |= VXLOCK;
912: /*
913: * Even if the count is zero, the VOP_INACTIVE routine may still
914: * have the object locked while it cleans it out. The VOP_LOCK
915: * ensures that the VOP_INACTIVE routine is done with its work.
916: * For active vnodes, it ensures that no other activity can
917: * occur while the underlying object is being cleaned out.
918: */
919: VOP_LOCK(vp, LK_DRAIN, p);
920:
921: /*
922: * Clean out any VM data associated with the vnode.
923: */
924: uvm_vnp_terminate(vp);
925: /*
926: * Clean out any buffers associated with the vnode.
927: */
928: if (flags & DOCLOSE)
929: vinvalbuf(vp, V_SAVE, NOCRED, p, 0, 0);
930: /*
931: * If purging an active vnode, it must be closed and
932: * deactivated before being reclaimed. Note that the
933: * VOP_INACTIVE will unlock the vnode
934: */
935: if (active) {
936: if (flags & DOCLOSE)
937: VOP_CLOSE(vp, FNONBLOCK, NOCRED, p);
938: VOP_INACTIVE(vp, p);
939: } else {
940: /*
941: * Any other processes trying to obtain this lock must first
942: * wait for VXLOCK to clear, then call the new lock operation.
943: */
944: VOP_UNLOCK(vp, 0, p);
945: }
946:
947: /*
948: * Reclaim the vnode.
949: */
950: if (VOP_RECLAIM(vp, p))
951: panic("vclean: cannot reclaim");
952: if (active) {
953: vp->v_usecount--;
954: if (vp->v_usecount == 0) {
955: if (vp->v_holdcnt > 0)
956: panic("vclean: not clean");
957: vputonfreelist(vp);
958: }
959: }
960: cache_purge(vp);
961:
962: /*
963: * Done with purge, notify sleepers of the grim news.
964: */
965: vp->v_op = dead_vnodeop_p;
966: VN_KNOTE(vp, NOTE_REVOKE);
967: vp->v_tag = VT_NON;
968: vp->v_flag &= ~VXLOCK;
969: #ifdef VFSDEBUG
970: vp->v_flag &= ~VLOCKSWORK;
971: #endif
972: if (vp->v_flag & VXWANT) {
973: vp->v_flag &= ~VXWANT;
974: wakeup(vp);
975: }
976: }
977:
978: /*
979: * Recycle an unused vnode to the front of the free list.
980: */
981: int
982: vrecycle(struct vnode *vp, struct proc *p)
983: {
984: if (vp->v_usecount == 0) {
985: vgonel(vp, p);
986: return (1);
987: }
988: return (0);
989: }
990:
991: /*
992: * Eliminate all activity associated with a vnode
993: * in preparation for reuse.
994: */
995: void
996: vgone(struct vnode *vp)
997: {
998: struct proc *p = curproc;
999: vgonel(vp, p);
1000: }
1001:
1002: /*
1003: * vgone, with struct proc.
1004: */
1005: void
1006: vgonel(struct vnode *vp, struct proc *p)
1007: {
1008: struct vnode *vq;
1009: struct vnode *vx;
1010: struct mount *mp;
1011: int flags;
1012:
1013: /*
1014: * If a vgone (or vclean) is already in progress,
1015: * wait until it is done and return.
1016: */
1017: if (vp->v_flag & VXLOCK) {
1018: vp->v_flag |= VXWANT;
1019: ltsleep(vp, PINOD | PNORELOCK, "vgone", 0, NULL);
1020: return;
1021: }
1022:
1023: /*
1024: * Clean out the filesystem specific data.
1025: */
1026: vclean(vp, DOCLOSE, p);
1027: /*
1028: * Delete from old mount point vnode list, if on one.
1029: */
1030: if (vp->v_mount != NULL)
1031: insmntque(vp, (struct mount *)0);
1032: /*
1033: * If special device, remove it from special device alias list
1034: * if it is on one.
1035: */
1036: if ((vp->v_type == VBLK || vp->v_type == VCHR) && vp->v_specinfo != 0) {
1037: if (*vp->v_hashchain == vp) {
1038: *vp->v_hashchain = vp->v_specnext;
1039: } else {
1040: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
1041: if (vq->v_specnext != vp)
1042: continue;
1043: vq->v_specnext = vp->v_specnext;
1044: break;
1045: }
1046: if (vq == NULL)
1047: panic("missing bdev");
1048: }
1049: if (vp->v_flag & VALIASED) {
1050: vx = NULL;
1051: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
1052: if (vq->v_rdev != vp->v_rdev ||
1053: vq->v_type != vp->v_type)
1054: continue;
1055: if (vx)
1056: break;
1057: vx = vq;
1058: }
1059: if (vx == NULL)
1060: panic("missing alias");
1061: if (vq == NULL)
1062: vx->v_flag &= ~VALIASED;
1063: vp->v_flag &= ~VALIASED;
1064: }
1065:
1066: /*
1067: * If we have a mount point associated with the vnode, we must
1068: * flush it out now, as to not leave a dangling zombie mount
1069: * point laying around in VFS.
1070: */
1071: mp = vp->v_specmountpoint;
1072: if (mp != NULL) {
1073: if (!vfs_busy(mp, VB_WRITE|VB_WAIT)) {
1074: flags = MNT_FORCE | MNT_DOOMED;
1075: dounmount(mp, flags, p, NULL);
1076: }
1077: }
1078:
1079: FREE(vp->v_specinfo, M_VNODE);
1080: vp->v_specinfo = NULL;
1081: }
1082: /*
1083: * If it is on the freelist and not already at the head,
1084: * move it to the head of the list.
1085: */
1086: vp->v_type = VBAD;
1087:
1088: /*
1089: * Move onto the free list, unless we were called from
1090: * getnewvnode and we're not on any free list
1091: */
1092: if (vp->v_usecount == 0 &&
1093: (vp->v_bioflag & VBIOONFREELIST)) {
1094: int s;
1095:
1096: s = splbio();
1097:
1098: if (vp->v_holdcnt > 0)
1099: panic("vgonel: not clean");
1100:
1101: if (TAILQ_FIRST(&vnode_free_list) != vp) {
1102: TAILQ_REMOVE(&vnode_free_list, vp, v_freelist);
1103: TAILQ_INSERT_HEAD(&vnode_free_list, vp, v_freelist);
1104: }
1105: splx(s);
1106: }
1107: }
1108:
1109: /*
1110: * Lookup a vnode by device number.
1111: */
1112: int
1113: vfinddev(dev_t dev, enum vtype type, struct vnode **vpp)
1114: {
1115: struct vnode *vp;
1116: int rc =0;
1117:
1118: for (vp = speclisth[SPECHASH(dev)]; vp; vp = vp->v_specnext) {
1119: if (dev != vp->v_rdev || type != vp->v_type)
1120: continue;
1121: *vpp = vp;
1122: rc = 1;
1123: break;
1124: }
1125: return (rc);
1126: }
1127:
1128: /*
1129: * Revoke all the vnodes corresponding to the specified minor number
1130: * range (endpoints inclusive) of the specified major.
1131: */
1132: void
1133: vdevgone(int maj, int minl, int minh, enum vtype type)
1134: {
1135: struct vnode *vp;
1136: int mn;
1137:
1138: for (mn = minl; mn <= minh; mn++)
1139: if (vfinddev(makedev(maj, mn), type, &vp))
1140: VOP_REVOKE(vp, REVOKEALL);
1141: }
1142:
1143: /*
1144: * Calculate the total number of references to a special device.
1145: */
1146: int
1147: vcount(struct vnode *vp)
1148: {
1149: struct vnode *vq, *vnext;
1150: int count;
1151:
1152: loop:
1153: if ((vp->v_flag & VALIASED) == 0)
1154: return (vp->v_usecount);
1155: for (count = 0, vq = *vp->v_hashchain; vq; vq = vnext) {
1156: vnext = vq->v_specnext;
1157: if (vq->v_rdev != vp->v_rdev || vq->v_type != vp->v_type)
1158: continue;
1159: /*
1160: * Alias, but not in use, so flush it out.
1161: */
1162: if (vq->v_usecount == 0 && vq != vp) {
1163: vgone(vq);
1164: goto loop;
1165: }
1166: count += vq->v_usecount;
1167: }
1168: return (count);
1169: }
1170:
1171: #if defined(DEBUG) || defined(DIAGNOSTIC)
1172: /*
1173: * Print out a description of a vnode.
1174: */
1175: static char *typename[] =
1176: { "VNON", "VREG", "VDIR", "VBLK", "VCHR", "VLNK", "VSOCK", "VFIFO", "VBAD" };
1177:
1178: void
1179: vprint(char *label, struct vnode *vp)
1180: {
1181: char buf[64];
1182:
1183: if (label != NULL)
1184: printf("%s: ", label);
1185: printf("%p, type %s, use %u, write %u, hold %u,",
1186: vp, typename[vp->v_type], vp->v_usecount, vp->v_writecount,
1187: vp->v_holdcnt);
1188: buf[0] = '\0';
1189: if (vp->v_flag & VROOT)
1190: strlcat(buf, "|VROOT", sizeof buf);
1191: if (vp->v_flag & VTEXT)
1192: strlcat(buf, "|VTEXT", sizeof buf);
1193: if (vp->v_flag & VSYSTEM)
1194: strlcat(buf, "|VSYSTEM", sizeof buf);
1195: if (vp->v_flag & VXLOCK)
1196: strlcat(buf, "|VXLOCK", sizeof buf);
1197: if (vp->v_flag & VXWANT)
1198: strlcat(buf, "|VXWANT", sizeof buf);
1199: if (vp->v_bioflag & VBIOWAIT)
1200: strlcat(buf, "|VBIOWAIT", sizeof buf);
1201: if (vp->v_bioflag & VBIOONFREELIST)
1202: strlcat(buf, "|VBIOONFREELIST", sizeof buf);
1203: if (vp->v_bioflag & VBIOONSYNCLIST)
1204: strlcat(buf, "|VBIOONSYNCLIST", sizeof buf);
1205: if (vp->v_flag & VALIASED)
1206: strlcat(buf, "|VALIASED", sizeof buf);
1207: if (buf[0] != '\0')
1208: printf(" flags (%s)", &buf[1]);
1209: if (vp->v_data == NULL) {
1210: printf("\n");
1211: } else {
1212: printf("\n\t");
1213: VOP_PRINT(vp);
1214: }
1215: }
1216: #endif /* DEBUG || DIAGNOSTIC */
1217:
1218: #ifdef DEBUG
1219: /*
1220: * List all of the locked vnodes in the system.
1221: * Called when debugging the kernel.
1222: */
1223: void
1224: printlockedvnodes(void)
1225: {
1226: struct mount *mp, *nmp;
1227: struct vnode *vp;
1228:
1229: printf("Locked vnodes\n");
1230:
1231: for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
1232: mp = nmp) {
1233: if (vfs_busy(mp, VB_READ|VB_NOWAIT)) {
1234: nmp = CIRCLEQ_NEXT(mp, mnt_list);
1235: continue;
1236: }
1237: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes) {
1238: if (VOP_ISLOCKED(vp))
1239: vprint((char *)0, vp);
1240: }
1241: nmp = CIRCLEQ_NEXT(mp, mnt_list);
1242: vfs_unbusy(mp);
1243: }
1244:
1245: }
1246: #endif
1247:
1248: /*
1249: * Top level filesystem related information gathering.
1250: */
1251: int
1252: vfs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
1253: size_t newlen, struct proc *p)
1254: {
1255: struct vfsconf *vfsp, *tmpvfsp;
1256: int ret;
1257:
1258: /* all sysctl names at this level are at least name and field */
1259: if (namelen < 2)
1260: return (ENOTDIR); /* overloaded */
1261:
1262: if (name[0] != VFS_GENERIC) {
1263: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
1264: if (vfsp->vfc_typenum == name[0])
1265: break;
1266:
1267: if (vfsp == NULL)
1268: return (EOPNOTSUPP);
1269:
1270: return ((*vfsp->vfc_vfsops->vfs_sysctl)(&name[1], namelen - 1,
1271: oldp, oldlenp, newp, newlen, p));
1272: }
1273:
1274: switch (name[1]) {
1275: case VFS_MAXTYPENUM:
1276: return (sysctl_rdint(oldp, oldlenp, newp, maxvfsconf));
1277:
1278: case VFS_CONF:
1279: if (namelen < 3)
1280: return (ENOTDIR); /* overloaded */
1281:
1282: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
1283: if (vfsp->vfc_typenum == name[2])
1284: break;
1285:
1286: if (vfsp == NULL)
1287: return (EOPNOTSUPP);
1288:
1289: /* Make a copy, clear out kernel pointers */
1290: tmpvfsp = malloc(sizeof(*tmpvfsp), M_TEMP, M_WAITOK);
1291: bcopy(vfsp, tmpvfsp, sizeof(*tmpvfsp));
1292: tmpvfsp->vfc_vfsops = NULL;
1293: tmpvfsp->vfc_mountroot = NULL;
1294: tmpvfsp->vfc_next = NULL;
1295:
1296: ret = sysctl_rdstruct(oldp, oldlenp, newp, tmpvfsp,
1297: sizeof(struct vfsconf));
1298:
1299: free(tmpvfsp, M_TEMP);
1300: return (ret);
1301: }
1302:
1303: return (EOPNOTSUPP);
1304: }
1305:
1306: int kinfo_vdebug = 1;
1307: #define KINFO_VNODESLOP 10
1308: /*
1309: * Dump vnode list (via sysctl).
1310: * Copyout address of vnode followed by vnode.
1311: */
1312: /* ARGSUSED */
1313: int
1314: sysctl_vnode(char *where, size_t *sizep, struct proc *p)
1315: {
1316: struct mount *mp, *nmp;
1317: struct vnode *vp, *nvp;
1318: char *bp = where, *savebp;
1319: char *ewhere;
1320: int error;
1321:
1322: if (where == NULL) {
1323: *sizep = (numvnodes + KINFO_VNODESLOP) * sizeof(struct e_vnode);
1324: return (0);
1325: }
1326: ewhere = where + *sizep;
1327:
1328: for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
1329: mp = nmp) {
1330: if (vfs_busy(mp, VB_READ|VB_NOWAIT)) {
1331: nmp = CIRCLEQ_NEXT(mp, mnt_list);
1332: continue;
1333: }
1334: savebp = bp;
1335: again:
1336: for (vp = LIST_FIRST(&mp->mnt_vnodelist); vp != NULL;
1337: vp = nvp) {
1338: /*
1339: * Check that the vp is still associated with
1340: * this filesystem. RACE: could have been
1341: * recycled onto the same filesystem.
1342: */
1343: if (vp->v_mount != mp) {
1344: if (kinfo_vdebug)
1345: printf("kinfo: vp changed\n");
1346: bp = savebp;
1347: goto again;
1348: }
1349: nvp = LIST_NEXT(vp, v_mntvnodes);
1350: if (bp + sizeof(struct e_vnode) > ewhere) {
1351: *sizep = bp - where;
1352: vfs_unbusy(mp);
1353: return (ENOMEM);
1354: }
1355: if ((error = copyout(&vp,
1356: &((struct e_vnode *)bp)->vptr,
1357: sizeof(struct vnode *))) ||
1358: (error = copyout(vp,
1359: &((struct e_vnode *)bp)->vnode,
1360: sizeof(struct vnode)))) {
1361: vfs_unbusy(mp);
1362: return (error);
1363: }
1364: bp += sizeof(struct e_vnode);
1365: }
1366:
1367: nmp = CIRCLEQ_NEXT(mp, mnt_list);
1368: vfs_unbusy(mp);
1369: }
1370:
1371: *sizep = bp - where;
1372:
1373: return (0);
1374: }
1375:
1376: /*
1377: * Check to see if a filesystem is mounted on a block device.
1378: */
1379: int
1380: vfs_mountedon(struct vnode *vp)
1381: {
1382: struct vnode *vq;
1383: int error = 0;
1384:
1385: if (vp->v_specmountpoint != NULL)
1386: return (EBUSY);
1387: if (vp->v_flag & VALIASED) {
1388: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
1389: if (vq->v_rdev != vp->v_rdev ||
1390: vq->v_type != vp->v_type)
1391: continue;
1392: if (vq->v_specmountpoint != NULL) {
1393: error = EBUSY;
1394: break;
1395: }
1396: }
1397: }
1398: return (error);
1399: }
1400:
1401: /*
1402: * Build hash lists of net addresses and hang them off the mount point.
1403: * Called by ufs_mount() to set up the lists of export addresses.
1404: */
1405: int
1406: vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
1407: struct export_args *argp)
1408: {
1409: struct netcred *np;
1410: struct radix_node_head *rnh;
1411: int i;
1412: struct radix_node *rn;
1413: struct sockaddr *saddr, *smask = 0;
1414: struct domain *dom;
1415: int error;
1416:
1417: if (argp->ex_addrlen == 0) {
1418: if (mp->mnt_flag & MNT_DEFEXPORTED)
1419: return (EPERM);
1420: np = &nep->ne_defexported;
1421: np->netc_exflags = argp->ex_flags;
1422: np->netc_anon = argp->ex_anon;
1423: np->netc_anon.cr_ref = 1;
1424: mp->mnt_flag |= MNT_DEFEXPORTED;
1425: return (0);
1426: }
1427: if (argp->ex_addrlen > MLEN || argp->ex_masklen > MLEN ||
1428: argp->ex_addrlen < 0 || argp->ex_masklen < 0)
1429: return (EINVAL);
1430: i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
1431: np = (struct netcred *)malloc(i, M_NETADDR, M_WAITOK);
1432: bzero(np, i);
1433: saddr = (struct sockaddr *)(np + 1);
1434: error = copyin(argp->ex_addr, saddr, argp->ex_addrlen);
1435: if (error)
1436: goto out;
1437: if (saddr->sa_len > argp->ex_addrlen)
1438: saddr->sa_len = argp->ex_addrlen;
1439: if (argp->ex_masklen) {
1440: smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
1441: error = copyin(argp->ex_mask, smask, argp->ex_masklen);
1442: if (error)
1443: goto out;
1444: if (smask->sa_len > argp->ex_masklen)
1445: smask->sa_len = argp->ex_masklen;
1446: }
1447: i = saddr->sa_family;
1448: if (i < 0 || i > AF_MAX) {
1449: error = EINVAL;
1450: goto out;
1451: }
1452: if ((rnh = nep->ne_rtable[i]) == 0) {
1453: /*
1454: * Seems silly to initialize every AF when most are not
1455: * used, do so on demand here
1456: */
1457: for (dom = domains; dom; dom = dom->dom_next)
1458: if (dom->dom_family == i && dom->dom_rtattach) {
1459: dom->dom_rtattach((void **)&nep->ne_rtable[i],
1460: dom->dom_rtoffset);
1461: break;
1462: }
1463: if ((rnh = nep->ne_rtable[i]) == 0) {
1464: error = ENOBUFS;
1465: goto out;
1466: }
1467: }
1468: rn = (*rnh->rnh_addaddr)((caddr_t)saddr, (caddr_t)smask, rnh,
1469: np->netc_rnodes);
1470: if (rn == 0 || np != (struct netcred *)rn) { /* already exists */
1471: error = EPERM;
1472: goto out;
1473: }
1474: np->netc_exflags = argp->ex_flags;
1475: np->netc_anon = argp->ex_anon;
1476: np->netc_anon.cr_ref = 1;
1477: return (0);
1478: out:
1479: free(np, M_NETADDR);
1480: return (error);
1481: }
1482:
1483: /* ARGSUSED */
1484: int
1485: vfs_free_netcred(struct radix_node *rn, void *w)
1486: {
1487: struct radix_node_head *rnh = (struct radix_node_head *)w;
1488:
1489: (*rnh->rnh_deladdr)(rn->rn_key, rn->rn_mask, rnh, NULL);
1490: free(rn, M_NETADDR);
1491: return (0);
1492: }
1493:
1494: /*
1495: * Free the net address hash lists that are hanging off the mount points.
1496: */
1497: void
1498: vfs_free_addrlist(struct netexport *nep)
1499: {
1500: int i;
1501: struct radix_node_head *rnh;
1502:
1503: for (i = 0; i <= AF_MAX; i++)
1504: if ((rnh = nep->ne_rtable[i]) != NULL) {
1505: (*rnh->rnh_walktree)(rnh, vfs_free_netcred, rnh);
1506: free(rnh, M_RTABLE);
1507: nep->ne_rtable[i] = 0;
1508: }
1509: }
1510:
1511: int
1512: vfs_export(struct mount *mp, struct netexport *nep, struct export_args *argp)
1513: {
1514: int error;
1515:
1516: if (argp->ex_flags & MNT_DELEXPORT) {
1517: vfs_free_addrlist(nep);
1518: mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
1519: }
1520: if (argp->ex_flags & MNT_EXPORTED) {
1521: if ((error = vfs_hang_addrlist(mp, nep, argp)) != 0)
1522: return (error);
1523: mp->mnt_flag |= MNT_EXPORTED;
1524: }
1525: return (0);
1526: }
1527:
1528: struct netcred *
1529: vfs_export_lookup(struct mount *mp, struct netexport *nep, struct mbuf *nam)
1530: {
1531: struct netcred *np;
1532: struct radix_node_head *rnh;
1533: struct sockaddr *saddr;
1534:
1535: np = NULL;
1536: if (mp->mnt_flag & MNT_EXPORTED) {
1537: /*
1538: * Lookup in the export list first.
1539: */
1540: if (nam != NULL) {
1541: saddr = mtod(nam, struct sockaddr *);
1542: rnh = nep->ne_rtable[saddr->sa_family];
1543: if (rnh != NULL) {
1544: np = (struct netcred *)
1545: (*rnh->rnh_matchaddr)((caddr_t)saddr,
1546: rnh);
1547: if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
1548: np = NULL;
1549: }
1550: }
1551: /*
1552: * If no address match, use the default if it exists.
1553: */
1554: if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
1555: np = &nep->ne_defexported;
1556: }
1557: return (np);
1558: }
1559:
1560: /*
1561: * Do the usual access checking.
1562: * file_mode, uid and gid are from the vnode in question,
1563: * while acc_mode and cred are from the VOP_ACCESS parameter list
1564: */
1565: int
1566: vaccess(mode_t file_mode, uid_t uid, gid_t gid, mode_t acc_mode,
1567: struct ucred *cred)
1568: {
1569: mode_t mask;
1570:
1571: /* User id 0 always gets access. */
1572: if (cred->cr_uid == 0)
1573: return 0;
1574:
1575: mask = 0;
1576:
1577: /* Otherwise, check the owner. */
1578: if (cred->cr_uid == uid) {
1579: if (acc_mode & VEXEC)
1580: mask |= S_IXUSR;
1581: if (acc_mode & VREAD)
1582: mask |= S_IRUSR;
1583: if (acc_mode & VWRITE)
1584: mask |= S_IWUSR;
1585: return (file_mode & mask) == mask ? 0 : EACCES;
1586: }
1587:
1588: /* Otherwise, check the groups. */
1589: if (cred->cr_gid == gid || groupmember(gid, cred)) {
1590: if (acc_mode & VEXEC)
1591: mask |= S_IXGRP;
1592: if (acc_mode & VREAD)
1593: mask |= S_IRGRP;
1594: if (acc_mode & VWRITE)
1595: mask |= S_IWGRP;
1596: return (file_mode & mask) == mask ? 0 : EACCES;
1597: }
1598:
1599: /* Otherwise, check everyone else. */
1600: if (acc_mode & VEXEC)
1601: mask |= S_IXOTH;
1602: if (acc_mode & VREAD)
1603: mask |= S_IROTH;
1604: if (acc_mode & VWRITE)
1605: mask |= S_IWOTH;
1606: return (file_mode & mask) == mask ? 0 : EACCES;
1607: }
1608:
1609: /*
1610: * Unmount all file systems.
1611: * We traverse the list in reverse order under the assumption that doing so
1612: * will avoid needing to worry about dependencies.
1613: */
1614: void
1615: vfs_unmountall(void)
1616: {
1617: struct mount *mp, *nmp;
1618: int allerror, error, again = 1;
1619:
1620: retry:
1621: allerror = 0;
1622: for (mp = CIRCLEQ_LAST(&mountlist); mp != CIRCLEQ_END(&mountlist);
1623: mp = nmp) {
1624: nmp = CIRCLEQ_PREV(mp, mnt_list);
1625: if ((vfs_busy(mp, VB_WRITE|VB_NOWAIT)) != 0)
1626: continue;
1627: if ((error = dounmount(mp, MNT_FORCE, curproc, NULL)) != 0) {
1628: printf("unmount of %s failed with error %d\n",
1629: mp->mnt_stat.f_mntonname, error);
1630: allerror = 1;
1631: }
1632: }
1633:
1634: if (allerror) {
1635: printf("WARNING: some file systems would not unmount\n");
1636: if (again) {
1637: printf("retrying\n");
1638: again = 0;
1639: goto retry;
1640: }
1641: }
1642: }
1643:
1644: /*
1645: * Sync and unmount file systems before shutting down.
1646: */
1647: void
1648: vfs_shutdown(void)
1649: {
1650: #ifdef ACCOUNTING
1651: extern void acct_shutdown(void);
1652:
1653: acct_shutdown();
1654: #endif
1655:
1656: /* XXX Should suspend scheduling. */
1657: (void) spl0();
1658:
1659: printf("syncing disks... ");
1660:
1661: if (panicstr == 0) {
1662: /* Sync before unmount, in case we hang on something. */
1663: sys_sync(&proc0, (void *)0, (register_t *)0);
1664:
1665: /* Unmount file systems. */
1666: vfs_unmountall();
1667: }
1668:
1669: if (vfs_syncwait(1))
1670: printf("giving up\n");
1671: else
1672: printf("done\n");
1673: }
1674:
1675: /*
1676: * perform sync() operation and wait for buffers to flush.
1677: * assumtions: called w/ scheduler disabled and physical io enabled
1678: * for now called at spl0() XXX
1679: */
1680: int
1681: vfs_syncwait(int verbose)
1682: {
1683: struct buf *bp;
1684: int iter, nbusy, dcount, s;
1685: struct proc *p;
1686:
1687: p = curproc? curproc : &proc0;
1688: sys_sync(p, (void *)0, (register_t *)0);
1689:
1690: /* Wait for sync to finish. */
1691: dcount = 10000;
1692: for (iter = 0; iter < 20; iter++) {
1693: nbusy = 0;
1694: LIST_FOREACH(bp, &bufhead, b_list) {
1695: if ((bp->b_flags & (B_BUSY|B_INVAL|B_READ)) == B_BUSY)
1696: nbusy++;
1697: /*
1698: * With soft updates, some buffers that are
1699: * written will be remarked as dirty until other
1700: * buffers are written.
1701: */
1702: if (bp->b_flags & B_DELWRI) {
1703: s = splbio();
1704: bremfree(bp);
1705: bp->b_flags |= B_BUSY;
1706: splx(s);
1707: nbusy++;
1708: bawrite(bp);
1709: if (dcount-- <= 0) {
1710: if (verbose)
1711: printf("softdep ");
1712: return 1;
1713: }
1714: }
1715: }
1716: if (nbusy == 0)
1717: break;
1718: if (verbose)
1719: printf("%d ", nbusy);
1720: DELAY(40000 * iter);
1721: }
1722:
1723: return nbusy;
1724: }
1725:
1726: /*
1727: * posix file system related system variables.
1728: */
1729: int
1730: fs_posix_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp,
1731: void *newp, size_t newlen, struct proc *p)
1732: {
1733: /* all sysctl names at this level are terminal */
1734: if (namelen != 1)
1735: return (ENOTDIR);
1736:
1737: switch (name[0]) {
1738: case FS_POSIX_SETUID:
1739: if (newp && securelevel > 0)
1740: return (EPERM);
1741: return(sysctl_int(oldp, oldlenp, newp, newlen, &suid_clear));
1742: default:
1743: return (EOPNOTSUPP);
1744: }
1745: /* NOTREACHED */
1746: }
1747:
1748: /*
1749: * file system related system variables.
1750: */
1751: int
1752: fs_sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
1753: size_t newlen, struct proc *p)
1754: {
1755: sysctlfn *fn;
1756:
1757: switch (name[0]) {
1758: case FS_POSIX:
1759: fn = fs_posix_sysctl;
1760: break;
1761: default:
1762: return (EOPNOTSUPP);
1763: }
1764: return (*fn)(name + 1, namelen - 1, oldp, oldlenp, newp, newlen, p);
1765: }
1766:
1767:
1768: /*
1769: * Routines dealing with vnodes and buffers
1770: */
1771:
1772: /*
1773: * Wait for all outstanding I/Os to complete
1774: *
1775: * Manipulates v_numoutput. Must be called at splbio()
1776: */
1777: int
1778: vwaitforio(struct vnode *vp, int slpflag, char *wmesg, int timeo)
1779: {
1780: int error = 0;
1781:
1782: splassert(IPL_BIO);
1783:
1784: while (vp->v_numoutput) {
1785: vp->v_bioflag |= VBIOWAIT;
1786: error = tsleep(&vp->v_numoutput,
1787: slpflag | (PRIBIO + 1), wmesg, timeo);
1788: if (error)
1789: break;
1790: }
1791:
1792: return (error);
1793: }
1794:
1795: /*
1796: * Update outstanding I/O count and do wakeup if requested.
1797: *
1798: * Manipulates v_numoutput. Must be called at splbio()
1799: */
1800: void
1801: vwakeup(struct vnode *vp)
1802: {
1803: splassert(IPL_BIO);
1804:
1805: if (vp != NULL) {
1806: if (vp->v_numoutput-- == 0)
1807: panic("vwakeup: neg numoutput");
1808: if ((vp->v_bioflag & VBIOWAIT) && vp->v_numoutput == 0) {
1809: vp->v_bioflag &= ~VBIOWAIT;
1810: wakeup(&vp->v_numoutput);
1811: }
1812: }
1813: }
1814:
1815: /*
1816: * Flush out and invalidate all buffers associated with a vnode.
1817: * Called with the underlying object locked.
1818: */
1819: int
1820: vinvalbuf(struct vnode *vp, int flags, struct ucred *cred, struct proc *p,
1821: int slpflag, int slptimeo)
1822: {
1823: struct buf *bp;
1824: struct buf *nbp, *blist;
1825: int s, error;
1826:
1827: #ifdef VFSDEBUG
1828: if ((vp->v_flag & VLOCKSWORK) && !VOP_ISLOCKED(vp))
1829: panic("vinvalbuf(): vp isn't locked");
1830: #endif
1831:
1832: if (flags & V_SAVE) {
1833: s = splbio();
1834: vwaitforio(vp, 0, "vinvalbuf", 0);
1835: if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
1836: splx(s);
1837: if ((error = VOP_FSYNC(vp, cred, MNT_WAIT, p)) != 0)
1838: return (error);
1839: s = splbio();
1840: if (vp->v_numoutput > 0 ||
1841: !LIST_EMPTY(&vp->v_dirtyblkhd))
1842: panic("vinvalbuf: dirty bufs");
1843: }
1844: splx(s);
1845: }
1846: loop:
1847: s = splbio();
1848: for (;;) {
1849: if ((blist = LIST_FIRST(&vp->v_cleanblkhd)) &&
1850: (flags & V_SAVEMETA))
1851: while (blist && blist->b_lblkno < 0)
1852: blist = LIST_NEXT(blist, b_vnbufs);
1853: if (blist == NULL &&
1854: (blist = LIST_FIRST(&vp->v_dirtyblkhd)) &&
1855: (flags & V_SAVEMETA))
1856: while (blist && blist->b_lblkno < 0)
1857: blist = LIST_NEXT(blist, b_vnbufs);
1858: if (!blist)
1859: break;
1860:
1861: for (bp = blist; bp; bp = nbp) {
1862: nbp = LIST_NEXT(bp, b_vnbufs);
1863: if (flags & V_SAVEMETA && bp->b_lblkno < 0)
1864: continue;
1865: if (bp->b_flags & B_BUSY) {
1866: bp->b_flags |= B_WANTED;
1867: error = tsleep(bp, slpflag | (PRIBIO + 1),
1868: "vinvalbuf", slptimeo);
1869: if (error) {
1870: splx(s);
1871: return (error);
1872: }
1873: break;
1874: }
1875: bremfree(bp);
1876: bp->b_flags |= B_BUSY;
1877: /*
1878: * XXX Since there are no node locks for NFS, I believe
1879: * there is a slight chance that a delayed write will
1880: * occur while sleeping just above, so check for it.
1881: */
1882: if ((bp->b_flags & B_DELWRI) && (flags & V_SAVE)) {
1883: splx(s);
1884: (void) VOP_BWRITE(bp);
1885: goto loop;
1886: }
1887: bp->b_flags |= B_INVAL;
1888: brelse(bp);
1889: }
1890: }
1891: if (!(flags & V_SAVEMETA) &&
1892: (!LIST_EMPTY(&vp->v_dirtyblkhd) || !LIST_EMPTY(&vp->v_cleanblkhd)))
1893: panic("vinvalbuf: flush failed");
1894: splx(s);
1895: return (0);
1896: }
1897:
1898: void
1899: vflushbuf(struct vnode *vp, int sync)
1900: {
1901: struct buf *bp, *nbp;
1902: int s;
1903:
1904: loop:
1905: s = splbio();
1906: for (bp = LIST_FIRST(&vp->v_dirtyblkhd);
1907: bp != LIST_END(&vp->v_dirtyblkhd); bp = nbp) {
1908: nbp = LIST_NEXT(bp, b_vnbufs);
1909: if ((bp->b_flags & B_BUSY))
1910: continue;
1911: if ((bp->b_flags & B_DELWRI) == 0)
1912: panic("vflushbuf: not dirty");
1913: bremfree(bp);
1914: bp->b_flags |= B_BUSY;
1915: splx(s);
1916: /*
1917: * Wait for I/O associated with indirect blocks to complete,
1918: * since there is no way to quickly wait for them below.
1919: */
1920: if (bp->b_vp == vp || sync == 0)
1921: (void) bawrite(bp);
1922: else
1923: (void) bwrite(bp);
1924: goto loop;
1925: }
1926: if (sync == 0) {
1927: splx(s);
1928: return;
1929: }
1930: vwaitforio(vp, 0, "vflushbuf", 0);
1931: if (!LIST_EMPTY(&vp->v_dirtyblkhd)) {
1932: splx(s);
1933: #ifdef DIAGNOSTIC
1934: vprint("vflushbuf: dirty", vp);
1935: #endif
1936: goto loop;
1937: }
1938: splx(s);
1939: }
1940:
1941: /*
1942: * Associate a buffer with a vnode.
1943: *
1944: * Manipulates buffer vnode queues. Must be called at splbio().
1945: */
1946: void
1947: bgetvp(struct vnode *vp, struct buf *bp)
1948: {
1949: splassert(IPL_BIO);
1950:
1951:
1952: if (bp->b_vp)
1953: panic("bgetvp: not free");
1954: vhold(vp);
1955: bp->b_vp = vp;
1956: if (vp->v_type == VBLK || vp->v_type == VCHR)
1957: bp->b_dev = vp->v_rdev;
1958: else
1959: bp->b_dev = NODEV;
1960: /*
1961: * Insert onto list for new vnode.
1962: */
1963: bufinsvn(bp, &vp->v_cleanblkhd);
1964: }
1965:
1966: /*
1967: * Disassociate a buffer from a vnode.
1968: *
1969: * Manipulates vnode buffer queues. Must be called at splbio().
1970: */
1971: void
1972: brelvp(struct buf *bp)
1973: {
1974: struct vnode *vp;
1975:
1976: splassert(IPL_BIO);
1977:
1978: if ((vp = bp->b_vp) == (struct vnode *) 0)
1979: panic("brelvp: NULL");
1980: /*
1981: * Delete from old vnode list, if on one.
1982: */
1983: if (LIST_NEXT(bp, b_vnbufs) != NOLIST)
1984: bufremvn(bp);
1985: if ((vp->v_bioflag & VBIOONSYNCLIST) &&
1986: LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
1987: vp->v_bioflag &= ~VBIOONSYNCLIST;
1988: LIST_REMOVE(vp, v_synclist);
1989: }
1990: bp->b_vp = (struct vnode *) 0;
1991:
1992: #ifdef DIAGNOSTIC
1993: if (vp->v_holdcnt == 0)
1994: panic("brelvp: holdcnt");
1995: #endif
1996: vp->v_holdcnt--;
1997:
1998: /*
1999: * If it is on the holdlist and the hold count drops to
2000: * zero, move it to the free list.
2001: */
2002: if ((vp->v_bioflag & VBIOONFREELIST) &&
2003: vp->v_holdcnt == 0 && vp->v_usecount == 0) {
2004: TAILQ_REMOVE(&vnode_hold_list, vp, v_freelist);
2005: TAILQ_INSERT_TAIL(&vnode_free_list, vp, v_freelist);
2006: }
2007: }
2008:
2009: /*
2010: * Replaces the current vnode associated with the buffer, if any,
2011: * with a new vnode.
2012: *
2013: * If an output I/O is pending on the buffer, the old vnode
2014: * I/O count is adjusted.
2015: *
2016: * Ignores vnode buffer queues. Must be called at splbio().
2017: */
2018: void
2019: buf_replacevnode(struct buf *bp, struct vnode *newvp)
2020: {
2021: struct vnode *oldvp = bp->b_vp;
2022:
2023: splassert(IPL_BIO);
2024:
2025: if (oldvp)
2026: brelvp(bp);
2027:
2028: if ((bp->b_flags & (B_READ | B_DONE)) == 0) {
2029: newvp->v_numoutput++; /* put it on swapdev */
2030: vwakeup(oldvp);
2031: }
2032:
2033: bgetvp(newvp, bp);
2034: bufremvn(bp);
2035: }
2036:
2037: /*
2038: * Used to assign buffers to the appropriate clean or dirty list on
2039: * the vnode and to add newly dirty vnodes to the appropriate
2040: * filesystem syncer list.
2041: *
2042: * Manipulates vnode buffer queues. Must be called at splbio().
2043: */
2044: void
2045: reassignbuf(struct buf *bp)
2046: {
2047: struct buflists *listheadp;
2048: int delay;
2049: struct vnode *vp = bp->b_vp;
2050:
2051: splassert(IPL_BIO);
2052:
2053: /*
2054: * Delete from old vnode list, if on one.
2055: */
2056: if (LIST_NEXT(bp, b_vnbufs) != NOLIST)
2057: bufremvn(bp);
2058:
2059: /*
2060: * If dirty, put on list of dirty buffers;
2061: * otherwise insert onto list of clean buffers.
2062: */
2063: if ((bp->b_flags & B_DELWRI) == 0) {
2064: listheadp = &vp->v_cleanblkhd;
2065: if ((vp->v_bioflag & VBIOONSYNCLIST) &&
2066: LIST_FIRST(&vp->v_dirtyblkhd) == NULL) {
2067: vp->v_bioflag &= ~VBIOONSYNCLIST;
2068: LIST_REMOVE(vp, v_synclist);
2069: }
2070: } else {
2071: listheadp = &vp->v_dirtyblkhd;
2072: if ((vp->v_bioflag & VBIOONSYNCLIST) == 0) {
2073: switch (vp->v_type) {
2074: case VDIR:
2075: delay = syncdelay / 2;
2076: break;
2077: case VBLK:
2078: if (vp->v_specmountpoint != NULL) {
2079: delay = syncdelay / 3;
2080: break;
2081: }
2082: /* FALLTHROUGH */
2083: default:
2084: delay = syncdelay;
2085: }
2086: vn_syncer_add_to_worklist(vp, delay);
2087: }
2088: }
2089: bufinsvn(bp, listheadp);
2090: }
2091:
2092: int
2093: vfs_register(struct vfsconf *vfs)
2094: {
2095: struct vfsconf *vfsp;
2096: struct vfsconf **vfspp;
2097:
2098: #ifdef DIAGNOSTIC
2099: /* Paranoia? */
2100: if (vfs->vfc_refcount != 0)
2101: printf("vfs_register called with vfc_refcount > 0\n");
2102: #endif
2103:
2104: /* Check if filesystem already known */
2105: for (vfspp = &vfsconf, vfsp = vfsconf; vfsp;
2106: vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next)
2107: if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
2108: return (EEXIST);
2109:
2110: if (vfs->vfc_typenum > maxvfsconf)
2111: maxvfsconf = vfs->vfc_typenum;
2112:
2113: vfs->vfc_next = NULL;
2114:
2115: /* Add to the end of the list */
2116: *vfspp = vfs;
2117:
2118: /* Call vfs_init() */
2119: if (vfs->vfc_vfsops->vfs_init)
2120: (*(vfs->vfc_vfsops->vfs_init))(vfs);
2121:
2122: return 0;
2123: }
2124:
2125: int
2126: vfs_unregister(struct vfsconf *vfs)
2127: {
2128: struct vfsconf *vfsp;
2129: struct vfsconf **vfspp;
2130: int maxtypenum;
2131:
2132: /* Find our vfsconf struct */
2133: for (vfspp = &vfsconf, vfsp = vfsconf; vfsp;
2134: vfspp = &vfsp->vfc_next, vfsp = vfsp->vfc_next) {
2135: if (strcmp(vfsp->vfc_name, vfs->vfc_name) == 0)
2136: break;
2137: }
2138:
2139: if (!vfsp) /* Not found */
2140: return (ENOENT);
2141:
2142: if (vfsp->vfc_refcount) /* In use */
2143: return (EBUSY);
2144:
2145: /* Remove from list and free */
2146: *vfspp = vfsp->vfc_next;
2147:
2148: maxtypenum = 0;
2149:
2150: for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
2151: if (vfsp->vfc_typenum > maxtypenum)
2152: maxtypenum = vfsp->vfc_typenum;
2153:
2154: maxvfsconf = maxtypenum;
2155: return 0;
2156: }
2157:
2158: /*
2159: * Check if vnode represents a disk device
2160: */
2161: int
2162: vn_isdisk(struct vnode *vp, int *errp)
2163: {
2164: if (vp->v_type != VBLK && vp->v_type != VCHR)
2165: return (0);
2166:
2167: return (1);
2168: }
2169:
2170: #ifdef DDB
2171: #include <machine/db_machdep.h>
2172: #include <ddb/db_interface.h>
2173: #include <ddb/db_output.h>
2174:
2175: void
2176: vfs_buf_print(struct buf *bp, int full, int (*pr)(const char *, ...))
2177: {
2178:
2179: (*pr)(" vp %p lblkno 0x%llx blkno 0x%llx dev 0x%x\n"
2180: " proc %p error %d flags %b\n",
2181: bp->b_vp, (int64_t)bp->b_lblkno, (int64_t)bp->b_blkno, bp->b_dev,
2182: bp->b_proc, bp->b_error, bp->b_flags, B_BITS);
2183:
2184: (*pr)(" bufsize 0x%lx bcount 0x%lx resid 0x%lx sync 0x%x\n"
2185: " data %p saveaddr %p dep %p iodone %p\n",
2186: bp->b_bufsize, bp->b_bcount, (long)bp->b_resid, bp->b_synctime,
2187: bp->b_data, bp->b_saveaddr, LIST_FIRST(&bp->b_dep), bp->b_iodone);
2188:
2189: (*pr)(" dirty {off 0x%x end 0x%x} valid {off 0x%x end 0x%x}\n",
2190: bp->b_dirtyoff, bp->b_dirtyend, bp->b_validoff, bp->b_validend);
2191:
2192: #ifdef FFS_SOFTUPDATES
2193: if (full)
2194: softdep_print(bp, full, pr);
2195: #endif
2196: }
2197:
2198: const char *vtypes[] = { VTYPE_NAMES };
2199: const char *vtags[] = { VTAG_NAMES };
2200:
2201: void
2202: vfs_vnode_print(struct vnode *vp, int full, int (*pr)(const char *, ...))
2203: {
2204:
2205: #define NENTS(n) (sizeof n / sizeof(n[0]))
2206: (*pr)("tag %s(%d) type %s(%d) mount %p typedata %p\n",
2207: vp->v_tag > NENTS(vtags)? "<unk>":vtags[vp->v_tag], vp->v_tag,
2208: vp->v_type > NENTS(vtypes)? "<unk>":vtypes[vp->v_type],
2209: vp->v_type, vp->v_mount, vp->v_mountedhere);
2210:
2211: (*pr)("data %p usecount %d writecount %ld holdcnt %ld numoutput %d\n",
2212: vp->v_data, vp->v_usecount, vp->v_writecount,
2213: vp->v_holdcnt, vp->v_numoutput);
2214:
2215: /* uvm_object_printit(&vp->v_uobj, full, pr); */
2216:
2217: if (full) {
2218: struct buf *bp;
2219:
2220: (*pr)("clean bufs:\n");
2221: LIST_FOREACH(bp, &vp->v_cleanblkhd, b_vnbufs) {
2222: (*pr)(" bp %p\n", bp);
2223: vfs_buf_print(bp, full, pr);
2224: }
2225:
2226: (*pr)("dirty bufs:\n");
2227: LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) {
2228: (*pr)(" bp %p\n", bp);
2229: vfs_buf_print(bp, full, pr);
2230: }
2231: }
2232: }
2233:
2234: void
2235: vfs_mount_print(struct mount *mp, int full, int (*pr)(const char *, ...))
2236: {
2237: struct vfsconf *vfc = mp->mnt_vfc;
2238: struct vnode *vp;
2239: int cnt = 0;
2240:
2241: (*pr)("flags %b\nvnodecovered %p syncer %p data %p\n",
2242: mp->mnt_flag, MNT_BITS,
2243: mp->mnt_vnodecovered, mp->mnt_syncer, mp->mnt_data);
2244:
2245: (*pr)("vfsconf: ops %p name \"%s\" num %d ref %d flags 0x%x\n",
2246: vfc->vfc_vfsops, vfc->vfc_name, vfc->vfc_typenum,
2247: vfc->vfc_refcount, vfc->vfc_flags);
2248:
2249: (*pr)("statvfs cache: bsize %x iosize %x\nblocks %u free %u avail %u\n",
2250: mp->mnt_stat.f_bsize, mp->mnt_stat.f_iosize, mp->mnt_stat.f_blocks,
2251: mp->mnt_stat.f_bfree, mp->mnt_stat.f_bavail);
2252:
2253: (*pr)(" files %u ffiles %u\n", mp->mnt_stat.f_files,
2254: mp->mnt_stat.f_ffree);
2255:
2256: (*pr)(" f_fsidx {0x%x, 0x%x} owner %u ctime 0x%x\n",
2257: mp->mnt_stat.f_fsid.val[0], mp->mnt_stat.f_fsid.val[1],
2258: mp->mnt_stat.f_owner, mp->mnt_stat.f_ctime);
2259:
2260: (*pr)(" syncwrites %lu asyncwrites = %lu\n",
2261: mp->mnt_stat.f_syncwrites, mp->mnt_stat.f_asyncwrites);
2262:
2263: (*pr)(" fstype \"%s\" mnton \"%s\" mntfrom \"%s\"\n",
2264: mp->mnt_stat.f_fstypename, mp->mnt_stat.f_mntonname,
2265: mp->mnt_stat.f_mntfromname);
2266:
2267: (*pr)("locked vnodes:");
2268: /* XXX would take mountlist lock, except ddb has no context */
2269: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
2270: if (VOP_ISLOCKED(vp)) {
2271: if (!LIST_NEXT(vp, v_mntvnodes))
2272: (*pr)(" %p", vp);
2273: else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4))))
2274: (*pr)("\n\t%p", vp);
2275: else
2276: (*pr)(", %p", vp);
2277: }
2278: (*pr)("\n");
2279:
2280: if (full) {
2281: (*pr)("all vnodes:\n\t");
2282: /* XXX would take mountlist lock, except ddb has no context */
2283: LIST_FOREACH(vp, &mp->mnt_vnodelist, v_mntvnodes)
2284: if (!LIST_NEXT(vp, v_mntvnodes))
2285: (*pr)(" %p", vp);
2286: else if (!(cnt++ % (72 / (sizeof(void *) * 2 + 4))))
2287: (*pr)(" %p,\n\t", vp);
2288: else
2289: (*pr)(" %p,", vp);
2290: (*pr)("\n", vp);
2291: }
2292: }
2293: #endif /* DDB */