1 | /* $NetBSD: coda_subr.c,v 1.31 2015/01/06 11:24:46 hannken Exp $ */ |
2 | |
3 | /* |
4 | * |
5 | * Coda: an Experimental Distributed File System |
6 | * Release 3.1 |
7 | * |
8 | * Copyright (c) 1987-1998 Carnegie Mellon University |
9 | * All Rights Reserved |
10 | * |
11 | * Permission to use, copy, modify and distribute this software and its |
12 | * documentation is hereby granted, provided that both the copyright |
13 | * notice and this permission notice appear in all copies of the |
14 | * software, derivative works or modified versions, and any portions |
15 | * thereof, and that both notices appear in supporting documentation, and |
16 | * that credit is given to Carnegie Mellon University in all documents |
17 | * and publicity pertaining to direct or indirect use of this code or its |
18 | * derivatives. |
19 | * |
20 | * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS, |
21 | * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS |
22 | * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON |
23 | * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER |
24 | * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF |
25 | * ANY DERIVATIVE WORK. |
26 | * |
27 | * Carnegie Mellon encourages users of this software to return any |
28 | * improvements or extensions that they make, and to grant Carnegie |
29 | * Mellon the rights to redistribute these changes without encumbrance. |
30 | * |
31 | * @(#) coda/coda_subr.c,v 1.1.1.1 1998/08/29 21:26:45 rvb Exp $ |
32 | */ |
33 | |
34 | /* |
35 | * Mach Operating System |
36 | * Copyright (c) 1989 Carnegie-Mellon University |
37 | * All rights reserved. The CMU software License Agreement specifies |
38 | * the terms and conditions for use and redistribution. |
39 | */ |
40 | |
41 | /* |
42 | * This code was written for the Coda file system at Carnegie Mellon |
43 | * University. Contributers include David Steere, James Kistler, and |
44 | * M. Satyanarayanan. */ |
45 | |
46 | /* NOTES: rvb |
47 | * 1. Added coda_unmounting to mark all cnodes as being UNMOUNTING. This has to |
48 | * be done before dounmount is called. Because some of the routines that |
49 | * dounmount calls before coda_unmounted might try to force flushes to venus. |
50 | * The vnode pager does this. |
51 | * 2. coda_unmounting marks all cnodes scanning coda_cache. |
52 | * 3. cfs_checkunmounting (under DEBUG) checks all cnodes by chasing the vnodes |
53 | * under the /coda mount point. |
54 | * 4. coda_cacheprint (under DEBUG) prints names with vnode/cnode address |
55 | */ |
56 | |
57 | #include <sys/cdefs.h> |
58 | __KERNEL_RCSID(0, "$NetBSD: coda_subr.c,v 1.31 2015/01/06 11:24:46 hannken Exp $" ); |
59 | |
60 | #include <sys/param.h> |
61 | #include <sys/systm.h> |
62 | #include <sys/malloc.h> |
63 | #include <sys/proc.h> |
64 | #include <sys/select.h> |
65 | #include <sys/mount.h> |
66 | #include <sys/kauth.h> |
67 | |
68 | #include <coda/coda.h> |
69 | #include <coda/cnode.h> |
70 | #include <coda/coda_subr.h> |
71 | #include <coda/coda_namecache.h> |
72 | |
73 | int codadebug = 0; |
74 | int coda_printf_delay = 0; /* in microseconds */ |
75 | int coda_vnop_print_entry = 0; |
76 | int coda_vfsop_print_entry = 0; |
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) \ |
84 | (coda_f2i(fid) & (CODA_CACHESIZE-1)) |
85 | #define IS_DIR(cnode) (cnode.opaque[2] & 0x1) |
86 | #endif |
87 | |
88 | struct vnode *coda_ctlvp; |
89 | |
90 | /* |
91 | * Lookup a cnode by fid. If the cnode is dying, it is bogus so skip it. |
92 | * The cnode is returned locked with the vnode referenced. |
93 | */ |
94 | struct cnode * |
95 | coda_find(CodaFid *fid) |
96 | { |
97 | int i; |
98 | struct vnode *vp; |
99 | struct cnode *cp; |
100 | |
101 | for (i = 0; i < NVCODA; i++) { |
102 | if (!coda_mnttbl[i].mi_started) |
103 | continue; |
104 | if (vcache_get(coda_mnttbl[i].mi_vfsp, |
105 | fid, sizeof(CodaFid), &vp) != 0) |
106 | continue; |
107 | mutex_enter(vp->v_interlock); |
108 | cp = VTOC(vp); |
109 | if (vp->v_type == VNON || cp == NULL || IS_UNMOUNTING(cp)) { |
110 | mutex_exit(vp->v_interlock); |
111 | vrele(vp); |
112 | continue; |
113 | } |
114 | mutex_enter(&cp->c_lock); |
115 | mutex_exit(vp->v_interlock); |
116 | |
117 | return cp; |
118 | } |
119 | |
120 | return NULL; |
121 | } |
122 | |
123 | /* |
124 | * Iterate over all nodes attached to coda mounts. |
125 | */ |
126 | static void |
127 | coda_iterate(bool (*f)(void *, struct vnode *), void *cl) |
128 | { |
129 | int i; |
130 | struct vnode_iterator *marker; |
131 | struct vnode *vp; |
132 | |
133 | for (i = 0; i < NVCODA; i++) { |
134 | if (coda_mnttbl[i].mi_vfsp == NULL) |
135 | continue; |
136 | vfs_vnode_iterator_init(coda_mnttbl[i].mi_vfsp, &marker); |
137 | while ((vp = vfs_vnode_iterator_next(marker, f, cl)) != NULL) |
138 | vrele(vp); |
139 | vfs_vnode_iterator_destroy(marker); |
140 | } |
141 | } |
142 | |
143 | /* |
144 | * coda_kill is called as a side effect to vcopen. To prevent any |
145 | * cnodes left around from an earlier run of a venus or warden from |
146 | * causing problems with the new instance, mark any outstanding cnodes |
147 | * as dying. Future operations on these cnodes should fail (excepting |
148 | * coda_inactive of course!). Since multiple venii/wardens can be |
149 | * running, only kill the cnodes for a particular entry in the |
150 | * coda_mnttbl. -- DCS 12/1/94 */ |
151 | |
152 | static bool |
153 | coda_kill_selector(void *cl, struct vnode *vp) |
154 | { |
155 | int *count = cl; |
156 | |
157 | (*count)++; |
158 | |
159 | return false; |
160 | } |
161 | |
162 | int |
163 | coda_kill(struct mount *whoIam, enum dc_status dcstat) |
164 | { |
165 | int count = 0; |
166 | struct vnode_iterator *marker; |
167 | |
168 | /* |
169 | * Algorithm is as follows: |
170 | * Second, flush whatever vnodes we can from the name cache. |
171 | */ |
172 | |
173 | /* This is slightly overkill, but should work. Eventually it'd be |
174 | * nice to only flush those entries from the namecache that |
175 | * reference a vnode in this vfs. */ |
176 | coda_nc_flush(dcstat); |
177 | |
178 | |
179 | vfs_vnode_iterator_init(whoIam, &marker); |
180 | vfs_vnode_iterator_next(marker, coda_kill_selector, &count); |
181 | vfs_vnode_iterator_destroy(marker); |
182 | |
183 | return count; |
184 | } |
185 | |
186 | /* |
187 | * There are two reasons why a cnode may be in use, it may be in the |
188 | * name cache or it may be executing. |
189 | */ |
190 | static bool |
191 | coda_flush_selector(void *cl, struct vnode *vp) |
192 | { |
193 | struct cnode *cp = VTOC(vp); |
194 | |
195 | if (cp != NULL && !IS_DIR(cp->c_fid)) /* only files can be executed */ |
196 | coda_vmflush(cp); |
197 | |
198 | return false; |
199 | } |
200 | void |
201 | coda_flush(enum dc_status dcstat) |
202 | { |
203 | |
204 | coda_clstat.ncalls++; |
205 | coda_clstat.reqs[CODA_FLUSH]++; |
206 | |
207 | coda_nc_flush(dcstat); /* flush files from the name cache */ |
208 | |
209 | coda_iterate(coda_flush_selector, NULL); |
210 | } |
211 | |
212 | /* |
213 | * As a debugging measure, print out any cnodes that lived through a |
214 | * name cache flush. |
215 | */ |
216 | static bool |
217 | coda_testflush_selector(void *cl, struct vnode *vp) |
218 | { |
219 | struct cnode *cp = VTOC(vp); |
220 | |
221 | if (cp != NULL) |
222 | myprintf(("Live cnode fid %s count %d\n" , |
223 | coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); |
224 | |
225 | return false; |
226 | } |
227 | void |
228 | coda_testflush(void) |
229 | { |
230 | |
231 | coda_iterate(coda_testflush_selector, NULL); |
232 | } |
233 | |
234 | /* |
235 | * First, step through all cnodes and mark them unmounting. |
236 | * NetBSD kernels may try to fsync them now that venus |
237 | * is dead, which would be a bad thing. |
238 | * |
239 | */ |
240 | static bool |
241 | coda_unmounting_selector(void *cl, struct vnode *vp) |
242 | { |
243 | struct cnode *cp = VTOC(vp); |
244 | |
245 | if (cp) |
246 | cp->c_flags |= C_UNMOUNTING; |
247 | |
248 | return false; |
249 | } |
250 | void |
251 | coda_unmounting(struct mount *whoIam) |
252 | { |
253 | struct vnode_iterator *marker; |
254 | |
255 | vfs_vnode_iterator_init(whoIam, &marker); |
256 | vfs_vnode_iterator_next(marker, coda_unmounting_selector, NULL); |
257 | vfs_vnode_iterator_destroy(marker); |
258 | } |
259 | |
260 | #ifdef DEBUG |
261 | static bool |
262 | coda_checkunmounting_selector(void *cl, struct vnode *vp) |
263 | { |
264 | struct cnode *cp = VTOC(vp); |
265 | |
266 | if (cp && !(cp->c_flags & C_UNMOUNTING)) { |
267 | printf("vp %p, cp %p missed\n" , vp, cp); |
268 | cp->c_flags |= C_UNMOUNTING; |
269 | } |
270 | |
271 | return false; |
272 | } |
273 | void |
274 | coda_checkunmounting(struct mount *mp) |
275 | { |
276 | struct vnode_iterator *marker; |
277 | |
278 | vfs_vnode_iterator_init(mp, &marker); |
279 | vfs_vnode_iterator_next(marker, coda_checkunmounting_selector, NULL); |
280 | vfs_vnode_iterator_destroy(marker); |
281 | } |
282 | |
283 | void |
284 | coda_cacheprint(struct mount *whoIam) |
285 | { |
286 | struct vnode *vp; |
287 | struct vnode_iterator *marker; |
288 | int count = 0; |
289 | |
290 | printf("coda_cacheprint: coda_ctlvp %p, cp %p" , coda_ctlvp, VTOC(coda_ctlvp)); |
291 | coda_nc_name(VTOC(coda_ctlvp)); |
292 | printf("\n" ); |
293 | |
294 | vfs_vnode_iterator_init(whoIam, &marker); |
295 | while ((vp = vfs_vnode_iterator_next(marker, NULL, NULL)) != NULL) { |
296 | printf("coda_cacheprint: vp %p, cp %p" , vp, VTOC(vp)); |
297 | coda_nc_name(VTOC(vp)); |
298 | printf("\n" ); |
299 | count++; |
300 | vrele(vp); |
301 | } |
302 | printf("coda_cacheprint: count %d\n" , count); |
303 | vfs_vnode_iterator_destroy(marker); |
304 | } |
305 | #endif |
306 | |
307 | /* |
308 | * There are 6 cases where invalidations occur. The semantics of each |
309 | * is listed here. |
310 | * |
311 | * CODA_FLUSH -- flush all entries from the name cache and the cnode cache. |
312 | * CODA_PURGEUSER -- flush all entries from the name cache for a specific user |
313 | * This call is a result of token expiration. |
314 | * |
315 | * The next two are the result of callbacks on a file or directory. |
316 | * CODA_ZAPDIR -- flush the attributes for the dir from its cnode. |
317 | * Zap all children of this directory from the namecache. |
318 | * CODA_ZAPFILE -- flush the attributes for a file. |
319 | * |
320 | * The fifth is a result of Venus detecting an inconsistent file. |
321 | * CODA_PURGEFID -- flush the attribute for the file |
322 | * If it is a dir (odd vnode), purge its |
323 | * children from the namecache |
324 | * remove the file from the namecache. |
325 | * |
326 | * The sixth allows Venus to replace local fids with global ones |
327 | * during reintegration. |
328 | * |
329 | * CODA_REPLACE -- replace one CodaFid with another throughout the name cache |
330 | */ |
331 | |
332 | int handleDownCall(int opcode, union outputArgs *out) |
333 | { |
334 | int error; |
335 | |
336 | /* Handle invalidate requests. */ |
337 | switch (opcode) { |
338 | case CODA_FLUSH : { |
339 | |
340 | coda_flush(IS_DOWNCALL); |
341 | |
342 | CODADEBUG(CODA_FLUSH,coda_testflush();) /* print remaining cnodes */ |
343 | return(0); |
344 | } |
345 | |
346 | case CODA_PURGEUSER : { |
347 | coda_clstat.ncalls++; |
348 | coda_clstat.reqs[CODA_PURGEUSER]++; |
349 | |
350 | /* XXX - need to prevent fsync's */ |
351 | #ifdef CODA_COMPAT_5 |
352 | coda_nc_purge_user(out->coda_purgeuser.cred.cr_uid, IS_DOWNCALL); |
353 | #else |
354 | coda_nc_purge_user(out->coda_purgeuser.uid, IS_DOWNCALL); |
355 | #endif |
356 | return(0); |
357 | } |
358 | |
359 | case CODA_ZAPFILE : { |
360 | struct cnode *cp; |
361 | |
362 | error = 0; |
363 | coda_clstat.ncalls++; |
364 | coda_clstat.reqs[CODA_ZAPFILE]++; |
365 | |
366 | cp = coda_find(&out->coda_zapfile.Fid); |
367 | if (cp != NULL) { |
368 | cp->c_flags &= ~C_VATTR; |
369 | if (CTOV(cp)->v_iflag & VI_TEXT) |
370 | error = coda_vmflush(cp); |
371 | CODADEBUG(CODA_ZAPFILE, myprintf(( |
372 | "zapfile: fid = %s, refcnt = %d, error = %d\n" , |
373 | coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error));); |
374 | if (CTOV(cp)->v_usecount == 1) { |
375 | cp->c_flags |= C_PURGING; |
376 | } |
377 | mutex_exit(&cp->c_lock); |
378 | vrele(CTOV(cp)); |
379 | } |
380 | |
381 | return(error); |
382 | } |
383 | |
384 | case CODA_ZAPDIR : { |
385 | struct cnode *cp; |
386 | |
387 | coda_clstat.ncalls++; |
388 | coda_clstat.reqs[CODA_ZAPDIR]++; |
389 | |
390 | cp = coda_find(&out->coda_zapdir.Fid); |
391 | if (cp != NULL) { |
392 | cp->c_flags &= ~C_VATTR; |
393 | coda_nc_zapParentfid(&out->coda_zapdir.Fid, IS_DOWNCALL); |
394 | |
395 | CODADEBUG(CODA_ZAPDIR, myprintf(( |
396 | "zapdir: fid = %s, refcnt = %d\n" , |
397 | coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1));); |
398 | if (CTOV(cp)->v_usecount == 1) { |
399 | cp->c_flags |= C_PURGING; |
400 | } |
401 | mutex_exit(&cp->c_lock); |
402 | vrele(CTOV(cp)); |
403 | } |
404 | |
405 | return(0); |
406 | } |
407 | |
408 | case CODA_PURGEFID : { |
409 | struct cnode *cp; |
410 | |
411 | error = 0; |
412 | coda_clstat.ncalls++; |
413 | coda_clstat.reqs[CODA_PURGEFID]++; |
414 | |
415 | cp = coda_find(&out->coda_purgefid.Fid); |
416 | if (cp != NULL) { |
417 | if (IS_DIR(out->coda_purgefid.Fid)) { /* Vnode is a directory */ |
418 | coda_nc_zapParentfid(&out->coda_purgefid.Fid, |
419 | IS_DOWNCALL); |
420 | } |
421 | cp->c_flags &= ~C_VATTR; |
422 | coda_nc_zapfid(&out->coda_purgefid.Fid, IS_DOWNCALL); |
423 | if (!(IS_DIR(out->coda_purgefid.Fid)) |
424 | && (CTOV(cp)->v_iflag & VI_TEXT)) { |
425 | |
426 | error = coda_vmflush(cp); |
427 | } |
428 | CODADEBUG(CODA_PURGEFID, myprintf(( |
429 | "purgefid: fid = %s, refcnt = %d, error = %d\n" , |
430 | coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount - 1, error));); |
431 | if (CTOV(cp)->v_usecount == 1) { |
432 | cp->c_flags |= C_PURGING; |
433 | } |
434 | mutex_exit(&cp->c_lock); |
435 | vrele(CTOV(cp)); |
436 | } |
437 | return(error); |
438 | } |
439 | |
440 | case CODA_REPLACE : { |
441 | struct cnode *cp = NULL; |
442 | |
443 | coda_clstat.ncalls++; |
444 | coda_clstat.reqs[CODA_REPLACE]++; |
445 | |
446 | cp = coda_find(&out->coda_replace.OldFid); |
447 | if (cp != NULL) { |
448 | error = vcache_rekey_enter(CTOV(cp)->v_mount, CTOV(cp), |
449 | &out->coda_replace.OldFid, sizeof(CodaFid), |
450 | &out->coda_replace.NewFid, sizeof(CodaFid)); |
451 | if (error) { |
452 | mutex_exit(&cp->c_lock); |
453 | vrele(CTOV(cp)); |
454 | return error; |
455 | } |
456 | cp->c_fid = out->coda_replace.NewFid; |
457 | vcache_rekey_exit(CTOV(cp)->v_mount, CTOV(cp), |
458 | &out->coda_replace.OldFid, sizeof(CodaFid), |
459 | &cp->c_fid, sizeof(CodaFid)); |
460 | |
461 | CODADEBUG(CODA_REPLACE, myprintf(( |
462 | "replace: oldfid = %s, newfid = %s, cp = %p\n" , |
463 | coda_f2s(&out->coda_replace.OldFid), |
464 | coda_f2s(&cp->c_fid), cp));) |
465 | mutex_exit(&cp->c_lock); |
466 | vrele(CTOV(cp)); |
467 | } |
468 | return (0); |
469 | } |
470 | default: |
471 | myprintf(("handleDownCall: unknown opcode %d\n" , opcode)); |
472 | return (EINVAL); |
473 | } |
474 | } |
475 | |
476 | /* coda_grab_vnode: lives in either cfs_mach.c or cfs_nbsd.c */ |
477 | |
478 | int |
479 | coda_vmflush(struct cnode *cp) |
480 | { |
481 | return 0; |
482 | } |
483 | |
484 | |
485 | /* |
486 | * kernel-internal debugging switches |
487 | */ |
488 | |
489 | void coda_debugon(void) |
490 | { |
491 | codadebug = -1; |
492 | coda_nc_debug = -1; |
493 | coda_vnop_print_entry = 1; |
494 | coda_psdev_print_entry = 1; |
495 | coda_vfsop_print_entry = 1; |
496 | } |
497 | |
498 | void coda_debugoff(void) |
499 | { |
500 | codadebug = 0; |
501 | coda_nc_debug = 0; |
502 | coda_vnop_print_entry = 0; |
503 | coda_psdev_print_entry = 0; |
504 | coda_vfsop_print_entry = 0; |
505 | } |
506 | |
507 | /* How to print a ucred */ |
508 | void |
509 | coda_print_cred(kauth_cred_t cred) |
510 | { |
511 | |
512 | uint16_t ngroups; |
513 | int i; |
514 | |
515 | myprintf(("ref %d\tuid %d\n" , kauth_cred_getrefcnt(cred), |
516 | kauth_cred_geteuid(cred))); |
517 | |
518 | ngroups = kauth_cred_ngroups(cred); |
519 | for (i=0; i < ngroups; i++) |
520 | myprintf(("\tgroup %d: (%d)\n" , i, kauth_cred_group(cred, i))); |
521 | myprintf(("\n" )); |
522 | |
523 | } |
524 | |
525 | /* |
526 | * Utilities used by both client and server |
527 | * Standard levels: |
528 | * 0) no debugging |
529 | * 1) hard failures |
530 | * 2) soft failures |
531 | * 3) current test software |
532 | * 4) main procedure entry points |
533 | * 5) main procedure exit points |
534 | * 6) utility procedure entry points |
535 | * 7) utility procedure exit points |
536 | * 8) obscure procedure entry points |
537 | * 9) obscure procedure exit points |
538 | * 10) random stuff |
539 | * 11) all <= 1 |
540 | * 12) all <= 2 |
541 | * 13) all <= 3 |
542 | * ... |
543 | */ |
544 | |