FreeBSD/Linux Kernel Cross Reference
sys/coda/coda_subr.c
1 /*-
2 * Coda: an Experimental Distributed File System
3 * Release 3.1
4 *
5 * Copyright (c) 1987-1998 Carnegie Mellon University
6 * All Rights Reserved
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation, and
13 * that credit is given to Carnegie Mellon University in all documents
14 * and publicity pertaining to direct or indirect use of this code or its
15 * derivatives.
16 *
17 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
18 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
19 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
20 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
21 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
22 * ANY DERIVATIVE WORK.
23 *
24 * Carnegie Mellon encourages users of this software to return any
25 * improvements or extensions that they make, and to grant Carnegie
26 * Mellon the rights to redistribute these changes without encumbrance.
27 *
28 * @(#) src/sys/coda/coda_subr.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
29 */
30 /*-
31 * Mach Operating System
32 * Copyright (c) 1989 Carnegie-Mellon University
33 * All rights reserved. The CMU software License Agreement specifies
34 * the terms and conditions for use and redistribution.
35 */
36
37 /*
38 * This code was written for the Coda filesystem at Carnegie Mellon
39 * University. Contributers include David Steere, James Kistler, and
40 * M. Satyanarayanan.
41 */
42
43 /* NOTES: rvb
44 * 1. Added coda_unmounting to mark all cnodes as being UNMOUNTING. This has to
45 * be done before dounmount is called. Because some of the routines that
46 * dounmount calls before coda_unmounted might try to force flushes to venus.
47 * The vnode pager does this.
48 * 2. coda_unmounting marks all cnodes scanning coda_cache.
49 * 3. cfs_checkunmounting (under DEBUG) checks all cnodes by chasing the vnodes
50 * under the /coda mount point.
51 * 4. coda_cacheprint (under DEBUG) prints names with vnode/cnode address
52 */
53
54 #include <sys/cdefs.h>
55 __FBSDID("$FreeBSD: releng/6.3/sys/coda/coda_subr.c 143510 2005-03-13 12:14:56Z jeff $");
56
57 #include <sys/param.h>
58 #include <sys/systm.h>
59 #include <sys/lock.h>
60 #include <sys/malloc.h>
61 #include <sys/mutex.h>
62 #include <sys/mount.h>
63
64 #include <coda/coda.h>
65 #include <coda/cnode.h>
66 #include <coda/coda_subr.h>
67 #include <coda/coda_namecache.h>
68
69 int coda_active = 0;
70 int coda_reuse = 0;
71 int coda_new = 0;
72
73 struct cnode *coda_freelist = NULL;
74 struct cnode *coda_cache[CODA_CACHESIZE];
75
76 #define CNODE_NEXT(cp) ((cp)->c_next)
77
78 #ifdef CODA_COMPAT_5
79 #define coda_hash(fid) \
80 (((fid)->Volume + (fid)->Vnode) & (CODA_CACHESIZE-1))
81 #define IS_DIR(cnode) (cnode.Vnode & 0x1)
82 #else
83 #define coda_hash(fid) (coda_f2i(fid) & (CODA_CACHESIZE-1))
84 #define IS_DIR(cnode) (cnode.opaque[2] & 0x1)
85 #endif
86
87 /*
88 * Allocate a cnode.
89 */
90 struct cnode *
91 coda_alloc(void)
92 {
93 struct cnode *cp;
94
95 if (coda_freelist) {
96 cp = coda_freelist;
97 coda_freelist = CNODE_NEXT(cp);
98 coda_reuse++;
99 }
100 else {
101 CODA_ALLOC(cp, struct cnode *, sizeof(struct cnode));
102 /* NetBSD vnodes don't have any Pager info in them ('cause there are
103 no external pagers, duh!) */
104 #define VNODE_VM_INFO_INIT(vp) /* MT */
105 VNODE_VM_INFO_INIT(CTOV(cp));
106 coda_new++;
107 }
108 bzero(cp, sizeof (struct cnode));
109
110 return(cp);
111 }
112
113 /*
114 * Deallocate a cnode.
115 */
116 void
117 coda_free(cp)
118 register struct cnode *cp;
119 {
120
121 CNODE_NEXT(cp) = coda_freelist;
122 coda_freelist = cp;
123 }
124
125 /*
126 * Put a cnode in the hash table
127 */
128 void
129 coda_save(cp)
130 struct cnode *cp;
131 {
132 CNODE_NEXT(cp) = coda_cache[coda_hash(&cp->c_fid)];
133 coda_cache[coda_hash(&cp->c_fid)] = cp;
134 }
135
136 /*
137 * Remove a cnode from the hash table
138 */
139 void
140 coda_unsave(cp)
141 struct cnode *cp;
142 {
143 struct cnode *ptr;
144 struct cnode *ptrprev = NULL;
145
146 ptr = coda_cache[coda_hash(&cp->c_fid)];
147 while (ptr != NULL) {
148 if (ptr == cp) {
149 if (ptrprev == NULL) {
150 coda_cache[coda_hash(&cp->c_fid)]
151 = CNODE_NEXT(ptr);
152 } else {
153 CNODE_NEXT(ptrprev) = CNODE_NEXT(ptr);
154 }
155 CNODE_NEXT(cp) = (struct cnode *)NULL;
156
157 return;
158 }
159 ptrprev = ptr;
160 ptr = CNODE_NEXT(ptr);
161 }
162 }
163
164 /*
165 * Lookup a cnode by fid. If the cnode is dying, it is bogus so skip it.
166 * NOTE: this allows multiple cnodes with same fid -- dcs 1/25/95
167 */
168 struct cnode *
169 coda_find(fid)
170 CodaFid *fid;
171 {
172 struct cnode *cp;
173
174 cp = coda_cache[coda_hash(fid)];
175 while (cp) {
176 if (coda_fid_eq(&(cp->c_fid), fid) &&
177 (!IS_UNMOUNTING(cp)))
178 {
179 coda_active++;
180 return(cp);
181 }
182 cp = CNODE_NEXT(cp);
183 }
184 return(NULL);
185 }
186
187 /*
188 * coda_kill is called as a side effect to vcopen. To prevent any
189 * cnodes left around from an earlier run of a venus or warden from
190 * causing problems with the new instance, mark any outstanding cnodes
191 * as dying. Future operations on these cnodes should fail (excepting
192 * coda_inactive of course!). Since multiple venii/wardens can be
193 * running, only kill the cnodes for a particular entry in the
194 * coda_mnttbl. -- DCS 12/1/94 */
195
196 int
197 coda_kill(whoIam, dcstat)
198 struct mount *whoIam;
199 enum dc_status dcstat;
200 {
201 int hash, count = 0;
202 struct cnode *cp;
203
204 /*
205 * Algorithm is as follows:
206 * Second, flush whatever vnodes we can from the name cache.
207 *
208 * Finally, step through whatever is left and mark them dying.
209 * This prevents any operation at all.
210 */
211
212 /* This is slightly overkill, but should work. Eventually it'd be
213 * nice to only flush those entries from the namecache that
214 * reference a vnode in this vfs. */
215 coda_nc_flush(dcstat);
216
217 for (hash = 0; hash < CODA_CACHESIZE; hash++) {
218 for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
219 if (CTOV(cp)->v_mount == whoIam) {
220 #ifdef DEBUG
221 printf("coda_kill: vp %p, cp %p\n", CTOV(cp), cp);
222 #endif
223 count++;
224 CODADEBUG(CODA_FLUSH,
225 myprintf(("Live cnode fid %s flags %d count %d\n",
226 coda_f2s(&cp->c_fid),
227 cp->c_flags,
228 vrefcnt(CTOV(cp)))); );
229 }
230 }
231 }
232 return count;
233 }
234
235 /*
236 * There are two reasons why a cnode may be in use, it may be in the
237 * name cache or it may be executing.
238 */
239 void
240 coda_flush(dcstat)
241 enum dc_status dcstat;
242 {
243 int hash;
244 struct cnode *cp;
245
246 coda_clstat.ncalls++;
247 coda_clstat.reqs[CODA_FLUSH]++;
248
249 coda_nc_flush(dcstat); /* flush files from the name cache */
250
251 for (hash = 0; hash < CODA_CACHESIZE; hash++) {
252 for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
253 if (!IS_DIR(cp->c_fid)) /* only files can be executed */
254 coda_vmflush(cp);
255 }
256 }
257 }
258
259 /*
260 * As a debugging measure, print out any cnodes that lived through a
261 * name cache flush.
262 */
263 void
264 coda_testflush(void)
265 {
266 int hash;
267 struct cnode *cp;
268
269 for (hash = 0; hash < CODA_CACHESIZE; hash++) {
270 for (cp = coda_cache[hash];
271 cp != NULL;
272 cp = CNODE_NEXT(cp)) {
273 myprintf(("Live cnode fid %s count %d\n",
274 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount));
275 }
276 }
277 }
278
279 /*
280 * First, step through all cnodes and mark them unmounting.
281 * NetBSD kernels may try to fsync them now that venus
282 * is dead, which would be a bad thing.
283 *
284 */
285 void
286 coda_unmounting(whoIam)
287 struct mount *whoIam;
288 {
289 int hash;
290 struct cnode *cp;
291
292 for (hash = 0; hash < CODA_CACHESIZE; hash++) {
293 for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
294 if (CTOV(cp)->v_mount == whoIam) {
295 if (cp->c_flags & (C_LOCKED|C_WANTED)) {
296 printf("coda_unmounting: Unlocking %p\n", cp);
297 cp->c_flags &= ~(C_LOCKED|C_WANTED);
298 wakeup((caddr_t) cp);
299 }
300 cp->c_flags |= C_UNMOUNTING;
301 }
302 }
303 }
304 }
305
306 #ifdef DEBUG
307 void
308 coda_checkunmounting(mp)
309 struct mount *mp;
310 {
311 struct vnode *vp, *nvp;
312 struct cnode *cp;
313 int count = 0, bad = 0;
314
315 MNT_ILOCK(mp);
316 MNT_VNODE_FOREACH(vp, mp, nvp) {
317 VI_LOCK(vp);
318 if (vp->v_iflag & VI_DOOMED) {
319 VI_UNLOCK(vp);
320 continue;
321 }
322 cp = VTOC(vp);
323 count++;
324 if (!(cp->c_flags & C_UNMOUNTING)) {
325 bad++;
326 printf("vp %p, cp %p missed\n", vp, cp);
327 cp->c_flags |= C_UNMOUNTING;
328 }
329 VI_UNLOCK(vp);
330 }
331 MNT_IUNLOCK(mp);
332 }
333
334 void
335 coda_cacheprint(whoIam)
336 struct mount *whoIam;
337 {
338 int hash;
339 struct cnode *cp;
340 int count = 0;
341
342 printf("coda_cacheprint: coda_ctlvp %p, cp %p", coda_ctlvp, VTOC(coda_ctlvp));
343 coda_nc_name(VTOC(coda_ctlvp));
344 printf("\n");
345
346 for (hash = 0; hash < CODA_CACHESIZE; hash++) {
347 for (cp = coda_cache[hash]; cp != NULL; cp = CNODE_NEXT(cp)) {
348 if (CTOV(cp)->v_mount == whoIam) {
349 printf("coda_cacheprint: vp %p, cp %p", CTOV(cp), cp);
350 coda_nc_name(cp);
351 printf("\n");
352 count++;
353 }
354 }
355 }
356 printf("coda_cacheprint: count %d\n", count);
357 }
358 #endif
359
360 /*
361 * There are 6 cases where invalidations occur. The semantics of each
362 * is listed here.
363 *
364 * CODA_FLUSH -- flush all entries from the name cache and the cnode cache.
365 * CODA_PURGEUSER -- flush all entries from the name cache for a specific user
366 * This call is a result of token expiration.
367 *
368 * The next two are the result of callbacks on a file or directory.
369 * CODA_ZAPDIR -- flush the attributes for the dir from its cnode.
370 * Zap all children of this directory from the namecache.
371 * CODA_ZAPFILE -- flush the attributes for a file.
372 *
373 * The fifth is a result of Venus detecting an inconsistent file.
374 * CODA_PURGEFID -- flush the attribute for the file
375 * If it is a dir (odd vnode), purge its
376 * children from the namecache
377 * remove the file from the namecache.
378 *
379 * The sixth allows Venus to replace local fids with global ones
380 * during reintegration.
381 *
382 * CODA_REPLACE -- replace one CodaFid with another throughout the name cache
383 */
384
385 int handleDownCall(opcode, out)
386 int opcode; union outputArgs *out;
387 {
388 int error;
389
390 /* Handle invalidate requests. */
391 switch (opcode) {
392 case CODA_FLUSH : {
393
394 coda_flush(IS_DOWNCALL);
395
396 CODADEBUG(CODA_FLUSH,coda_testflush();) /* print remaining cnodes */
397 return(0);
398 }
399
400 case CODA_PURGEUSER : {
401 coda_clstat.ncalls++;
402 coda_clstat.reqs[CODA_PURGEUSER]++;
403
404 /* XXX - need to prevent fsync's */
405 #ifdef CODA_COMPAT_5
406 coda_nc_purge_user(out->coda_purgeuser.cred.cr_uid, IS_DOWNCALL);
407 #else
408 coda_nc_purge_user(out->coda_purgeuser.uid, IS_DOWNCALL);
409 #endif
410 return(0);
411 }
412
413 case CODA_ZAPFILE : {
414 struct cnode *cp;
415
416 error = 0;
417 coda_clstat.ncalls++;
418 coda_clstat.reqs[CODA_ZAPFILE]++;
419
420 cp = coda_find(&out->coda_zapfile.Fid);
421 if (cp != NULL) {
422 vref(CTOV(cp));
423
424 cp->c_flags &= ~C_VATTR;
425 ASSERT_VOP_LOCKED(CTOV(cp), "coda HandleDownCall");
426 if (CTOV(cp)->v_vflag & VV_TEXT)
427 error = coda_vmflush(cp);
428 CODADEBUG(CODA_ZAPFILE,
429 myprintf(("zapfile: fid = %s, refcnt = %d, error = %d\n",
430 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
431 if (vrefcnt(CTOV(cp)) == 1) {
432 cp->c_flags |= C_PURGING;
433 }
434 vrele(CTOV(cp));
435 }
436
437 return(error);
438 }
439
440 case CODA_ZAPDIR : {
441 struct cnode *cp;
442
443 coda_clstat.ncalls++;
444 coda_clstat.reqs[CODA_ZAPDIR]++;
445
446 cp = coda_find(&out->coda_zapdir.Fid);
447 if (cp != NULL) {
448 vref(CTOV(cp));
449
450 cp->c_flags &= ~C_VATTR;
451 coda_nc_zapParentfid(&out->coda_zapdir.Fid, IS_DOWNCALL);
452
453 CODADEBUG(CODA_ZAPDIR, myprintf((
454 "zapdir: fid = %s, refcnt = %d\n",
455 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1)););
456 if (vrefcnt(CTOV(cp)) == 1) {
457 cp->c_flags |= C_PURGING;
458 }
459 vrele(CTOV(cp));
460 }
461
462 return(0);
463 }
464
465 case CODA_PURGEFID : {
466 struct cnode *cp;
467
468 error = 0;
469 coda_clstat.ncalls++;
470 coda_clstat.reqs[CODA_PURGEFID]++;
471
472 cp = coda_find(&out->coda_purgefid.Fid);
473 if (cp != NULL) {
474 vref(CTOV(cp));
475 if (IS_DIR(out->coda_purgefid.Fid)) { /* Vnode is a directory */
476 coda_nc_zapParentfid(&out->coda_purgefid.Fid,IS_DOWNCALL);
477 }
478 cp->c_flags &= ~C_VATTR;
479 coda_nc_zapfid(&out->coda_purgefid.Fid, IS_DOWNCALL);
480 ASSERT_VOP_LOCKED(CTOV(cp), "coda HandleDownCall");
481 if (!(IS_DIR(out->coda_purgefid.Fid))
482 && (CTOV(cp)->v_vflag & VV_TEXT)) {
483
484 error = coda_vmflush(cp);
485 }
486 CODADEBUG(CODA_PURGEFID, myprintf((
487 "purgefid: fid = %s, refcnt = %d, error = %d\n",
488 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error)););
489 if (vrefcnt(CTOV(cp)) == 1) {
490 cp->c_flags |= C_PURGING;
491 }
492 vrele(CTOV(cp));
493 }
494 return(error);
495 }
496
497 case CODA_REPLACE : {
498 struct cnode *cp = NULL;
499
500 coda_clstat.ncalls++;
501 coda_clstat.reqs[CODA_REPLACE]++;
502
503 cp = coda_find(&out->coda_replace.OldFid);
504 if (cp != NULL) {
505 /* remove the cnode from the hash table, replace the fid, and reinsert */
506 vref(CTOV(cp));
507 coda_unsave(cp);
508 cp->c_fid = out->coda_replace.NewFid;
509 coda_save(cp);
510
511 CODADEBUG(CODA_REPLACE, myprintf((
512 "replace: oldfid = %s, newfid = %s, cp = %p\n",
513 coda_f2s(&out->coda_replace.OldFid),
514 coda_f2s(&cp->c_fid), cp));) vrele(CTOV(cp));
515 }
516 return (0);
517 }
518 default:
519 myprintf(("handleDownCall: unknown opcode %d\n", opcode));
520 return (EINVAL);
521 }
522 }
523
524 /* coda_grab_vnode: lives in either cfs_mach.c or cfs_nbsd.c */
525
526 int
527 coda_vmflush(cp)
528 struct cnode *cp;
529 {
530 return 0;
531 }
532
533
534 /*
535 * kernel-internal debugging switches
536 */
537 void coda_debugon(void)
538 {
539 codadebug = -1;
540 coda_nc_debug = -1;
541 coda_vnop_print_entry = 1;
542 coda_psdev_print_entry = 1;
543 coda_vfsop_print_entry = 1;
544 }
545
546 void coda_debugoff(void)
547 {
548 codadebug = 0;
549 coda_nc_debug = 0;
550 coda_vnop_print_entry = 0;
551 coda_psdev_print_entry = 0;
552 coda_vfsop_print_entry = 0;
553 }
554
555 /*
556 * Utilities used by both client and server
557 * Standard levels:
558 * 0) no debugging
559 * 1) hard failures
560 * 2) soft failures
561 * 3) current test software
562 * 4) main procedure entry points
563 * 5) main procedure exit points
564 * 6) utility procedure entry points
565 * 7) utility procedure exit points
566 * 8) obscure procedure entry points
567 * 9) obscure procedure exit points
568 * 10) random stuff
569 * 11) all <= 1
570 * 12) all <= 2
571 * 13) all <= 3
572 * ...
573 */
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