FreeBSD/Linux Kernel Cross Reference
sys/coda/coda_vnops.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_vnops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
29 */
30 /*
31 * Mach Operating System
32 * Copyright (c) 1990 Carnegie-Mellon University
33 * Copyright (c) 1989 Carnegie-Mellon University
34 * All rights reserved. The CMU software License Agreement specifies
35 * the terms and conditions for use and redistribution.
36 */
37
38 /*
39 * This code was written for the Coda filesystem at Carnegie Mellon
40 * University. Contributers include David Steere, James Kistler, and
41 * M. Satyanarayanan.
42 */
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: releng/6.4/sys/coda/coda_vnops.c 156618 2006-03-13 03:04:00Z jeff $");
46
47 #include <sys/param.h>
48 #include <sys/systm.h>
49 #include <sys/acct.h>
50 #include <sys/errno.h>
51 #include <sys/fcntl.h>
52 #include <sys/kernel.h>
53 #include <sys/lock.h>
54 #include <sys/malloc.h>
55 #include <sys/file.h> /* Must come after sys/malloc.h */
56 #include <sys/mount.h>
57 #include <sys/mutex.h>
58 #include <sys/namei.h>
59 #include <sys/proc.h>
60 #include <sys/uio.h>
61 #include <sys/unistd.h>
62
63 #include <vm/vm.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_extern.h>
66
67 #include <coda/coda.h>
68 #include <coda/cnode.h>
69 #include <coda/coda_vnops.h>
70 #include <coda/coda_venus.h>
71 #include <coda/coda_opstats.h>
72 #include <coda/coda_subr.h>
73 #include <coda/coda_namecache.h>
74 #include <coda/coda_pioctl.h>
75
76 /*
77 * These flags select various performance enhancements.
78 */
79 int coda_attr_cache = 1; /* Set to cache attributes in the kernel */
80 int coda_symlink_cache = 1; /* Set to cache symbolic link information */
81 int coda_access_cache = 1; /* Set to handle some access checks directly */
82
83 /* structure to keep track of vfs calls */
84
85 struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE];
86
87 #define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++)
88 #define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++)
89 #define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++)
90 #define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++)
91
92 /* What we are delaying for in printf */
93 int coda_printf_delay = 0; /* in microseconds */
94 int coda_vnop_print_entry = 0;
95 static int coda_lockdebug = 0;
96
97 /*
98 * Some NetBSD details:
99 *
100 * coda_start is called at the end of the mount syscall.
101 * coda_init is called at boot time.
102 */
103
104 #define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__))
105
106 /* Definition of the vnode operation vector */
107
108 struct vop_vector coda_vnodeops = {
109 .vop_default = VOP_PANIC,
110 .vop_lookup = coda_lookup, /* lookup */
111 .vop_create = coda_create, /* create */
112 .vop_mknod = VOP_PANIC, /* mknod */
113 .vop_open = coda_open, /* open */
114 .vop_close = coda_close, /* close */
115 .vop_access = coda_access, /* access */
116 .vop_getattr = coda_getattr, /* getattr */
117 .vop_setattr = coda_setattr, /* setattr */
118 .vop_read = coda_read, /* read */
119 .vop_write = coda_write, /* write */
120 .vop_ioctl = coda_ioctl, /* ioctl */
121 .vop_fsync = coda_fsync, /* fsync */
122 .vop_remove = coda_remove, /* remove */
123 .vop_link = coda_link, /* link */
124 .vop_rename = coda_rename, /* rename */
125 .vop_mkdir = coda_mkdir, /* mkdir */
126 .vop_rmdir = coda_rmdir, /* rmdir */
127 .vop_symlink = coda_symlink, /* symlink */
128 .vop_readdir = coda_readdir, /* readdir */
129 .vop_readlink = coda_readlink, /* readlink */
130 .vop_inactive = coda_inactive, /* inactive */
131 .vop_reclaim = coda_reclaim, /* reclaim */
132 .vop_lock = coda_lock, /* lock */
133 .vop_unlock = coda_unlock, /* unlock */
134 .vop_bmap = coda_bmap, /* bmap */
135 .vop_print = VOP_PANIC, /* print */
136 .vop_islocked = coda_islocked, /* islocked */
137 .vop_pathconf = coda_pathconf, /* pathconf */
138 .vop_advlock = VOP_NULL, /* advlock */
139 .vop_lease = VOP_NULL, /* lease */
140 .vop_poll = vop_stdpoll,
141 .vop_getpages = vop_stdgetpages, /* pager intf.*/
142 .vop_putpages = vop_stdputpages, /* pager intf.*/
143 .vop_getwritemount = vop_stdgetwritemount,
144
145 #if 0
146 missing
147 .vop_cachedlookup = ufs_lookup,
148 .vop_whiteout = ufs_whiteout,
149 #endif
150
151 };
152
153 /* A generic do-nothing. For lease_check, advlock */
154 int
155 coda_vop_nop(void *anon) {
156 struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
157
158 if (codadebug) {
159 myprintf(("Vnode operation %s called, but unsupported\n",
160 (*desc)->vdesc_name));
161 }
162 return (0);
163 }
164
165 int
166 coda_vnodeopstats_init(void)
167 {
168 register int i;
169
170 for(i=0;i<CODA_VNODEOPS_SIZE;i++) {
171 coda_vnodeopstats[i].opcode = i;
172 coda_vnodeopstats[i].entries = 0;
173 coda_vnodeopstats[i].sat_intrn = 0;
174 coda_vnodeopstats[i].unsat_intrn = 0;
175 coda_vnodeopstats[i].gen_intrn = 0;
176 }
177 return 0;
178 }
179
180 /*
181 * coda_open calls Venus to return the device, inode pair of the cache
182 * file holding the data. Using iget, coda_open finds the vnode of the
183 * cache file, and then opens it.
184 */
185 int
186 coda_open(struct vop_open_args *ap)
187 {
188 /*
189 * NetBSD can pass the O_EXCL flag in mode, even though the check
190 * has already happened. Venus defensively assumes that if open
191 * is passed the EXCL, it must be a bug. We strip the flag here.
192 */
193 /* true args */
194 register struct vnode **vpp = &(ap->a_vp);
195 struct cnode *cp = VTOC(*vpp);
196 int flag = ap->a_mode & (~O_EXCL);
197 struct ucred *cred = ap->a_cred;
198 struct thread *td = ap->a_td;
199 /* locals */
200 int error;
201 struct vnode *vp;
202 struct cdev *dev;
203 ino_t inode;
204
205 MARK_ENTRY(CODA_OPEN_STATS);
206
207 /* Check for open of control file. */
208 if (IS_CTL_VP(*vpp)) {
209 /* XXX */
210 /* if (WRITEABLE(flag)) */
211 if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) {
212 MARK_INT_FAIL(CODA_OPEN_STATS);
213 return(EACCES);
214 }
215 MARK_INT_SAT(CODA_OPEN_STATS);
216 return(0);
217 }
218
219 error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred, td->td_proc, &dev, &inode);
220 if (error)
221 return (error);
222 if (!error) {
223 CODADEBUG( CODA_OPEN,myprintf(("open: dev %#lx inode %lu result %d\n",
224 (u_long)dev2udev(dev), (u_long)inode,
225 error)); )
226 }
227
228 /* Translate the <device, inode> pair for the cache file into
229 an inode pointer. */
230 error = coda_grab_vnode(dev, inode, &vp);
231 if (error)
232 return (error);
233
234 /* We get the vnode back locked. Needs unlocked */
235 VOP_UNLOCK(vp, 0, td);
236 /* Keep a reference until the close comes in. */
237 vref(*vpp);
238
239 /* Save the vnode pointer for the cache file. */
240 if (cp->c_ovp == NULL) {
241 cp->c_ovp = vp;
242 } else {
243 if (cp->c_ovp != vp)
244 panic("coda_open: cp->c_ovp != ITOV(ip)");
245 }
246 cp->c_ocount++;
247
248 /* Flush the attribute cached if writing the file. */
249 if (flag & FWRITE) {
250 cp->c_owrite++;
251 cp->c_flags &= ~C_VATTR;
252 }
253
254 /* Save the <device, inode> pair for the cache file to speed
255 up subsequent page_read's. */
256 cp->c_device = dev;
257 cp->c_inode = inode;
258
259 /* Open the cache file. */
260 error = VOP_OPEN(vp, flag, cred, td, -1);
261 if (error) {
262 printf("coda_open: VOP_OPEN on container failed %d\n", error);
263 return (error);
264 }
265 /* grab (above) does this when it calls newvnode unless it's in the cache*/
266
267 return(error);
268 }
269
270 /*
271 * Close the cache file used for I/O and notify Venus.
272 */
273 int
274 coda_close(struct vop_close_args *ap)
275 {
276 /* true args */
277 struct vnode *vp = ap->a_vp;
278 struct cnode *cp = VTOC(vp);
279 int flag = ap->a_fflag;
280 struct ucred *cred = ap->a_cred;
281 struct thread *td = ap->a_td;
282 /* locals */
283 int error;
284
285 MARK_ENTRY(CODA_CLOSE_STATS);
286
287 /* Check for close of control file. */
288 if (IS_CTL_VP(vp)) {
289 MARK_INT_SAT(CODA_CLOSE_STATS);
290 return(0);
291 }
292
293 if (IS_UNMOUNTING(cp)) {
294 if (cp->c_ovp) {
295 #ifdef CODA_VERBOSE
296 printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n",
297 vrefcnt(vp), cp->c_ovp, vp, cp);
298 #endif
299 #ifdef hmm
300 vgone(cp->c_ovp);
301 #else
302 VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
303 vrele(cp->c_ovp);
304 #endif
305 } else {
306 #ifdef CODA_VERBOSE
307 printf("coda_close: NO container vp %p/cp %p\n", vp, cp);
308 #endif
309 }
310 return ENODEV;
311 } else {
312 VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
313 vrele(cp->c_ovp);
314 }
315
316 if (--cp->c_ocount == 0)
317 cp->c_ovp = NULL;
318
319 if (flag & FWRITE) /* file was opened for write */
320 --cp->c_owrite;
321
322 error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, td->td_proc);
323 vrele(CTOV(cp));
324
325 CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); )
326 return(error);
327 }
328
329 int
330 coda_read(struct vop_read_args *ap)
331 {
332
333 ENTRY;
334 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ,
335 ap->a_ioflag, ap->a_cred, ap->a_uio->uio_td));
336 }
337
338 int
339 coda_write(struct vop_write_args *ap)
340 {
341
342 ENTRY;
343 return(coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE,
344 ap->a_ioflag, ap->a_cred, ap->a_uio->uio_td));
345 }
346
347 int
348 coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag,
349 struct ucred *cred, struct thread *td)
350 {
351 /* upcall decl */
352 /* NOTE: container file operation!!! */
353 /* locals */
354 struct cnode *cp = VTOC(vp);
355 struct vnode *cfvp = cp->c_ovp;
356 struct proc *p = td->td_proc;
357 struct thread *ltd = td;
358 int igot_internally = 0;
359 int opened_internally = 0;
360 int error = 0;
361 int iscore = 0;
362
363 MARK_ENTRY(CODA_RDWR_STATS);
364
365 CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %d, %lld, %d)\n", rw,
366 (void *)uiop->uio_iov->iov_base, uiop->uio_resid,
367 (long long)uiop->uio_offset, uiop->uio_segflg)); )
368
369 /* Check for rdwr of control object. */
370 if (IS_CTL_VP(vp)) {
371 MARK_INT_FAIL(CODA_RDWR_STATS);
372 return(EINVAL);
373 }
374
375 /*
376 * If file is not already open this must be a page
377 * {read,write} request. Iget the cache file's inode
378 * pointer if we still have its <device, inode> pair.
379 * Otherwise, we must do an internal open to derive the
380 * pair.
381 */
382 if (cfvp == NULL) {
383 /*
384 * If we're dumping core, do the internal open. Otherwise
385 * venus won't have the correct size of the core when
386 * it's completely written.
387 */
388 if (p) {
389 PROC_LOCK(p);
390 iscore = (p->p_acflag & ACORE);
391 PROC_UNLOCK(p);
392 }
393 else
394 ltd = curthread;
395
396 if (cp->c_inode != 0 && !iscore) {
397 igot_internally = 1;
398 error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp);
399 if (error) {
400 MARK_INT_FAIL(CODA_RDWR_STATS);
401 return(error);
402 }
403 /*
404 * We get the vnode back locked by curthread in both Mach and
405 * NetBSD. Needs unlocked
406 */
407 VOP_UNLOCK(cfvp, 0, ltd);
408 }
409 else {
410 opened_internally = 1;
411 MARK_INT_GEN(CODA_OPEN_STATS);
412 error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE),
413 cred, td, -1);
414 printf("coda_rdwr: Internally Opening %p\n", vp);
415 if (error) {
416 printf("coda_rdwr: VOP_OPEN on container failed %d\n", error);
417 return (error);
418 }
419 cfvp = cp->c_ovp;
420 }
421 }
422
423 /* Have UFS handle the call. */
424 CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = %d\n",
425 coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)); )
426 if (rw == UIO_READ) {
427 error = VOP_READ(cfvp, uiop, ioflag, cred);
428 } else {
429 error = VOP_WRITE(cfvp, uiop, ioflag, cred);
430 /* ufs_write updates the vnode_pager_setsize for the vnode/object */
431
432 { struct vattr attr;
433
434 if (VOP_GETATTR(cfvp, &attr, cred, td) == 0) {
435 vnode_pager_setsize(vp, attr.va_size);
436 }
437 }
438 }
439
440 if (error)
441 MARK_INT_FAIL(CODA_RDWR_STATS);
442 else
443 MARK_INT_SAT(CODA_RDWR_STATS);
444
445 /* Do an internal close if necessary. */
446 if (opened_internally) {
447 MARK_INT_GEN(CODA_CLOSE_STATS);
448 (void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred, td);
449 }
450
451 /* Invalidate cached attributes if writing. */
452 if (rw == UIO_WRITE)
453 cp->c_flags &= ~C_VATTR;
454 return(error);
455 }
456
457
458
459 int
460 coda_ioctl(struct vop_ioctl_args *ap)
461 {
462 /* true args */
463 struct vnode *vp = ap->a_vp;
464 int com = ap->a_command;
465 caddr_t data = ap->a_data;
466 int flag = ap->a_fflag;
467 struct ucred *cred = ap->a_cred;
468 struct thread *td = ap->a_td;
469 /* locals */
470 int error;
471 struct vnode *tvp;
472 struct nameidata ndp;
473 struct PioctlData *iap = (struct PioctlData *)data;
474
475 MARK_ENTRY(CODA_IOCTL_STATS);
476
477 CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path));)
478
479 /* Don't check for operation on a dying object, for ctlvp it
480 shouldn't matter */
481
482 /* Must be control object to succeed. */
483 if (!IS_CTL_VP(vp)) {
484 MARK_INT_FAIL(CODA_IOCTL_STATS);
485 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != ctlvp"));)
486 return (EOPNOTSUPP);
487 }
488 /* Look up the pathname. */
489
490 /* Should we use the name cache here? It would get it from
491 lookupname sooner or later anyway, right? */
492
493 NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW), UIO_USERSPACE, iap->path, td);
494 error = namei(&ndp);
495 tvp = ndp.ni_vp;
496
497 if (error) {
498 MARK_INT_FAIL(CODA_IOCTL_STATS);
499 CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup returns %d\n",
500 error));)
501 return(error);
502 }
503
504 /*
505 * Make sure this is a coda style cnode, but it may be a
506 * different vfsp
507 */
508 if (tvp->v_op != &coda_vnodeops) {
509 vrele(tvp);
510 NDFREE(&ndp, NDF_ONLY_PNBUF);
511 MARK_INT_FAIL(CODA_IOCTL_STATS);
512 CODADEBUG(CODA_IOCTL,
513 myprintf(("coda_ioctl error: %s not a coda object\n",
514 iap->path));)
515 return(EINVAL);
516 }
517
518 if (iap->vi.in_size > VC_MAXDATASIZE) {
519 NDFREE(&ndp, 0);
520 return(EINVAL);
521 }
522 error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag, data, cred, td->td_proc);
523
524 if (error)
525 MARK_INT_FAIL(CODA_IOCTL_STATS);
526 else
527 CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n", error)); )
528
529 vrele(tvp);
530 NDFREE(&ndp, NDF_ONLY_PNBUF);
531 return(error);
532 }
533
534 /*
535 * To reduce the cost of a user-level venus;we cache attributes in
536 * the kernel. Each cnode has storage allocated for an attribute. If
537 * c_vattr is valid, return a reference to it. Otherwise, get the
538 * attributes from venus and store them in the cnode. There is some
539 * question if this method is a security leak. But I think that in
540 * order to make this call, the user must have done a lookup and
541 * opened the file, and therefore should already have access.
542 */
543 int
544 coda_getattr(struct vop_getattr_args *ap)
545 {
546 /* true args */
547 struct vnode *vp = ap->a_vp;
548 struct cnode *cp = VTOC(vp);
549 struct vattr *vap = ap->a_vap;
550 struct ucred *cred = ap->a_cred;
551 struct thread *td = ap->a_td;
552 /* locals */
553 int error;
554
555 MARK_ENTRY(CODA_GETATTR_STATS);
556
557 if (IS_UNMOUNTING(cp))
558 return ENODEV;
559
560 /* Check for getattr of control object. */
561 if (IS_CTL_VP(vp)) {
562 MARK_INT_FAIL(CODA_GETATTR_STATS);
563 return(ENOENT);
564 }
565
566 /* Check to see if the attributes have already been cached */
567 if (VALID_VATTR(cp)) {
568 CODADEBUG(CODA_GETATTR, { myprintf(("attr cache hit: %s\n",
569 coda_f2s(&cp->c_fid)));});
570 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
571 print_vattr(&cp->c_vattr); );
572
573 *vap = cp->c_vattr;
574 MARK_INT_SAT(CODA_GETATTR_STATS);
575 return(0);
576 }
577
578 error = venus_getattr(vtomi(vp), &cp->c_fid, cred, td->td_proc, vap);
579
580 if (!error) {
581 CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result %d\n",
582 coda_f2s(&cp->c_fid), error)); )
583
584 CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
585 print_vattr(vap); );
586
587 { int size = vap->va_size;
588 struct vnode *convp = cp->c_ovp;
589 if (convp != (struct vnode *)0) {
590 vnode_pager_setsize(convp, size);
591 }
592 }
593 /* If not open for write, store attributes in cnode */
594 if ((cp->c_owrite == 0) && (coda_attr_cache)) {
595 cp->c_vattr = *vap;
596 cp->c_flags |= C_VATTR;
597 }
598
599 }
600 return(error);
601 }
602
603 int
604 coda_setattr(struct vop_setattr_args *ap)
605 {
606 /* true args */
607 register struct vnode *vp = ap->a_vp;
608 struct cnode *cp = VTOC(vp);
609 register struct vattr *vap = ap->a_vap;
610 struct ucred *cred = ap->a_cred;
611 struct thread *td = ap->a_td;
612 /* locals */
613 int error;
614
615 MARK_ENTRY(CODA_SETATTR_STATS);
616
617 /* Check for setattr of control object. */
618 if (IS_CTL_VP(vp)) {
619 MARK_INT_FAIL(CODA_SETATTR_STATS);
620 return(ENOENT);
621 }
622
623 if (codadebug & CODADBGMSK(CODA_SETATTR)) {
624 print_vattr(vap);
625 }
626 error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, td->td_proc);
627
628 if (!error)
629 cp->c_flags &= ~C_VATTR;
630
631 { int size = vap->va_size;
632 struct vnode *convp = cp->c_ovp;
633 if (size != VNOVAL && convp != (struct vnode *)0) {
634 vnode_pager_setsize(convp, size);
635 }
636 }
637 CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); )
638 return(error);
639 }
640
641 int
642 coda_access(struct vop_access_args *ap)
643 {
644 /* true args */
645 struct vnode *vp = ap->a_vp;
646 struct cnode *cp = VTOC(vp);
647 int mode = ap->a_mode;
648 struct ucred *cred = ap->a_cred;
649 struct thread *td = ap->a_td;
650 /* locals */
651 int error;
652
653 MARK_ENTRY(CODA_ACCESS_STATS);
654
655 /* Check for access of control object. Only read access is
656 allowed on it. */
657 if (IS_CTL_VP(vp)) {
658 /* bogus hack - all will be marked as successes */
659 MARK_INT_SAT(CODA_ACCESS_STATS);
660 return(((mode & VREAD) && !(mode & (VWRITE | VEXEC)))
661 ? 0 : EACCES);
662 }
663
664 /*
665 * if the file is a directory, and we are checking exec (eg lookup)
666 * access, and the file is in the namecache, then the user must have
667 * lookup access to it.
668 */
669 if (coda_access_cache) {
670 if ((vp->v_type == VDIR) && (mode & VEXEC)) {
671 if (coda_nc_lookup(cp, ".", 1, cred)) {
672 MARK_INT_SAT(CODA_ACCESS_STATS);
673 return(0); /* it was in the cache */
674 }
675 }
676 }
677
678 error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, td->td_proc);
679
680 return(error);
681 }
682
683 int
684 coda_readlink(struct vop_readlink_args *ap)
685 {
686 /* true args */
687 struct vnode *vp = ap->a_vp;
688 struct cnode *cp = VTOC(vp);
689 struct uio *uiop = ap->a_uio;
690 struct ucred *cred = ap->a_cred;
691 struct thread *td = ap->a_uio->uio_td;
692 /* locals */
693 int error;
694 char *str;
695 int len;
696
697 MARK_ENTRY(CODA_READLINK_STATS);
698
699 /* Check for readlink of control object. */
700 if (IS_CTL_VP(vp)) {
701 MARK_INT_FAIL(CODA_READLINK_STATS);
702 return(ENOENT);
703 }
704
705 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) { /* symlink was cached */
706 uiop->uio_rw = UIO_READ;
707 error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop);
708 if (error)
709 MARK_INT_FAIL(CODA_READLINK_STATS);
710 else
711 MARK_INT_SAT(CODA_READLINK_STATS);
712 return(error);
713 }
714
715 error = venus_readlink(vtomi(vp), &cp->c_fid, cred,
716 td != NULL ? td->td_proc : NULL, &str, &len);
717
718 if (!error) {
719 uiop->uio_rw = UIO_READ;
720 error = uiomove(str, len, uiop);
721
722 if (coda_symlink_cache) {
723 cp->c_symlink = str;
724 cp->c_symlen = len;
725 cp->c_flags |= C_SYMLINK;
726 } else
727 CODA_FREE(str, len);
728 }
729
730 CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",error));)
731 return(error);
732 }
733
734 int
735 coda_fsync(struct vop_fsync_args *ap)
736 {
737 /* true args */
738 struct vnode *vp = ap->a_vp;
739 struct cnode *cp = VTOC(vp);
740 struct thread *td = ap->a_td;
741 /* locals */
742 struct vnode *convp = cp->c_ovp;
743 int error;
744
745 MARK_ENTRY(CODA_FSYNC_STATS);
746
747 /* Check for fsync on an unmounting object */
748 /* The NetBSD kernel, in it's infinite wisdom, can try to fsync
749 * after an unmount has been initiated. This is a Bad Thing,
750 * which we have to avoid. Not a legitimate failure for stats.
751 */
752 if (IS_UNMOUNTING(cp)) {
753 return(ENODEV);
754 }
755
756 /* Check for fsync of control object. */
757 if (IS_CTL_VP(vp)) {
758 MARK_INT_SAT(CODA_FSYNC_STATS);
759 return(0);
760 }
761
762 if (convp)
763 VOP_FSYNC(convp, MNT_WAIT, td);
764
765 /*
766 * We see fsyncs with usecount == 1 then usecount == 0.
767 * For now we ignore them.
768 */
769 /*
770 VI_LOCK(vp);
771 if (!vp->v_usecount) {
772 printf("coda_fsync on vnode %p with %d usecount. c_flags = %x (%x)\n",
773 vp, vp->v_usecount, cp->c_flags, cp->c_flags&C_PURGING);
774 }
775 VI_UNLOCK(vp);
776 */
777
778 /*
779 * We can expect fsync on any vnode at all if venus is pruging it.
780 * Venus can't very well answer the fsync request, now can it?
781 * Hopefully, it won't have to, because hopefully, venus preserves
782 * the (possibly untrue) invariant that it never purges an open
783 * vnode. Hopefully.
784 */
785 if (cp->c_flags & C_PURGING) {
786 return(0);
787 }
788
789 /* needs research */
790 return 0;
791 error = venus_fsync(vtomi(vp), &cp->c_fid, td->td_proc);
792
793 CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); );
794 return(error);
795 }
796
797 int
798 coda_inactive(struct vop_inactive_args *ap)
799 {
800 /* XXX - at the moment, inactive doesn't look at cred, and doesn't
801 have a proc pointer. Oops. */
802 /* true args */
803 struct vnode *vp = ap->a_vp;
804 struct cnode *cp = VTOC(vp);
805 struct ucred *cred __attribute__((unused)) = NULL;
806 struct thread *td __attribute__((unused)) = curthread;
807 /* upcall decl */
808 /* locals */
809
810 /* We don't need to send inactive to venus - DCS */
811 MARK_ENTRY(CODA_INACTIVE_STATS);
812
813 if (IS_CTL_VP(vp)) {
814 MARK_INT_SAT(CODA_INACTIVE_STATS);
815 return 0;
816 }
817
818 CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n",
819 coda_f2s(&cp->c_fid), vp->v_mount));)
820
821 /* If an array has been allocated to hold the symlink, deallocate it */
822 if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) {
823 if (cp->c_symlink == NULL)
824 panic("coda_inactive: null symlink pointer in cnode");
825
826 CODA_FREE(cp->c_symlink, cp->c_symlen);
827 cp->c_flags &= ~C_SYMLINK;
828 cp->c_symlen = 0;
829 }
830
831 /* Remove it from the table so it can't be found. */
832 coda_unsave(cp);
833 if ((struct coda_mntinfo *)(vp->v_mount->mnt_data) == NULL) {
834 myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p wasn't dying\n", vp));
835 panic("badness in coda_inactive\n");
836 }
837
838 if (IS_UNMOUNTING(cp)) {
839 #ifdef DEBUG
840 printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n", vrefcnt(vp), vp, cp);
841 if (cp->c_ovp != NULL)
842 printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n",
843 vrefcnt(vp), vp, cp);
844 #endif
845 } else {
846 #ifdef OLD_DIAGNOSTIC
847 if (vrefcnt(CTOV(cp))) {
848 panic("coda_inactive: nonzero reference count");
849 }
850 if (cp->c_ovp != NULL) {
851 panic("coda_inactive: cp->ovp != NULL");
852 }
853 #endif
854 vgone(vp);
855 }
856
857 MARK_INT_SAT(CODA_INACTIVE_STATS);
858 return(0);
859 }
860
861 /*
862 * Remote filesystem operations having to do with directory manipulation.
863 */
864
865 /*
866 * It appears that in NetBSD, lookup is supposed to return the vnode locked
867 */
868 int
869 coda_lookup(struct vop_lookup_args *ap)
870 {
871 /* true args */
872 struct vnode *dvp = ap->a_dvp;
873 struct cnode *dcp = VTOC(dvp);
874 struct vnode **vpp = ap->a_vpp;
875 /*
876 * It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest
877 * of the string to xlate, and that we must try to get at least
878 * ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I
879 * could be wrong.
880 */
881 struct componentname *cnp = ap->a_cnp;
882 struct ucred *cred = cnp->cn_cred;
883 struct thread *td = cnp->cn_thread;
884 /* locals */
885 struct cnode *cp;
886 const char *nm = cnp->cn_nameptr;
887 int len = cnp->cn_namelen;
888 CodaFid VFid;
889 int vtype;
890 int error = 0;
891
892 MARK_ENTRY(CODA_LOOKUP_STATS);
893
894 CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n",
895 nm, coda_f2s(&dcp->c_fid))););
896
897 /* Check for lookup of control object. */
898 if (IS_CTL_NAME(dvp, nm, len)) {
899 *vpp = coda_ctlvp;
900 vref(*vpp);
901 MARK_INT_SAT(CODA_LOOKUP_STATS);
902 goto exit;
903 }
904
905 if (len+1 > CODA_MAXNAMLEN) {
906 MARK_INT_FAIL(CODA_LOOKUP_STATS);
907
908 CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, %s (%s)\n",
909 coda_f2s(&dcp->c_fid), nm)););
910 *vpp = (struct vnode *)0;
911 error = EINVAL;
912 goto exit;
913 }
914 /* First try to look the file up in the cfs name cache */
915 /* lock the parent vnode? */
916 cp = coda_nc_lookup(dcp, nm, len, cred);
917 if (cp) {
918 *vpp = CTOV(cp);
919 vref(*vpp);
920 CODADEBUG(CODA_LOOKUP,
921 myprintf(("lookup result %d vpp %p\n",error,*vpp));)
922 } else {
923
924 /* The name wasn't cached, so we need to contact Venus */
925 error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred, td->td_proc, &VFid, &vtype);
926
927 if (error) {
928 MARK_INT_FAIL(CODA_LOOKUP_STATS);
929
930 CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s (%s)%d\n",
931 coda_f2s(&dcp->c_fid), nm, error));)
932 *vpp = (struct vnode *)0;
933 } else {
934 MARK_INT_SAT(CODA_LOOKUP_STATS);
935 CODADEBUG(CODA_LOOKUP,
936 myprintf(("lookup: %s type %o result %d\n",
937 coda_f2s(&VFid), vtype, error)); )
938 cp = make_coda_node(&VFid, dvp->v_mount, vtype);
939 *vpp = CTOV(cp);
940
941 /* enter the new vnode in the Name Cache only if the top bit isn't set */
942 /* And don't enter a new vnode for an invalid one! */
943 if (!(vtype & CODA_NOCACHE))
944 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
945 }
946 }
947
948 exit:
949 /*
950 * If we are creating, and this was the last name to be looked up,
951 * and the error was ENOENT, then there really shouldn't be an
952 * error and we can make the leaf NULL and return success. Since
953 * this is supposed to work under Mach as well as NetBSD, we're
954 * leaving this fn wrapped. We also must tell lookup/namei that
955 * we need to save the last component of the name. (Create will
956 * have to free the name buffer later...lucky us...)
957 */
958 if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME))
959 && (cnp->cn_flags & ISLASTCN)
960 && (error == ENOENT))
961 {
962 error = EJUSTRETURN;
963 cnp->cn_flags |= SAVENAME;
964 *ap->a_vpp = NULL;
965 }
966
967 /*
968 * If we are removing, and we are at the last element, and we
969 * found it, then we need to keep the name around so that the
970 * removal will go ahead as planned. Unfortunately, this will
971 * probably also lock the to-be-removed vnode, which may or may
972 * not be a good idea. I'll have to look at the bits of
973 * coda_remove to make sure. We'll only save the name if we did in
974 * fact find the name, otherwise coda_remove won't have a chance
975 * to free the pathname.
976 */
977 if ((cnp->cn_nameiop == DELETE)
978 && (cnp->cn_flags & ISLASTCN)
979 && !error)
980 {
981 cnp->cn_flags |= SAVENAME;
982 }
983
984 /*
985 * If the lookup went well, we need to (potentially?) unlock the
986 * parent, and lock the child. We are only responsible for
987 * checking to see if the parent is supposed to be unlocked before
988 * we return. We must always lock the child (provided there is
989 * one, and (the parent isn't locked or it isn't the same as the
990 * parent.) Simple, huh? We can never leave the parent locked unless
991 * we are ISLASTCN
992 */
993 if (!error || (error == EJUSTRETURN)) {
994 if (cnp->cn_flags & ISDOTDOT) {
995 if ((error = VOP_UNLOCK(dvp, 0, td))) {
996 return error;
997 }
998 /*
999 * The parent is unlocked. As long as there is a child,
1000 * lock it without bothering to check anything else.
1001 */
1002 if (*ap->a_vpp) {
1003 if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
1004 vn_lock(dvp, LK_RETRY|LK_EXCLUSIVE, td);
1005 return (error);
1006 }
1007 }
1008 vn_lock(dvp, LK_RETRY|LK_EXCLUSIVE, td);
1009 } else {
1010 /* The parent is locked, and may be the same as the child */
1011 if (*ap->a_vpp && (*ap->a_vpp != dvp)) {
1012 /* Different, go ahead and lock it. */
1013 if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
1014 return (error);
1015 }
1016 }
1017 }
1018 } else {
1019 /* If the lookup failed, we need to ensure that the leaf is NULL */
1020 /* Don't change any locking? */
1021 *ap->a_vpp = NULL;
1022 }
1023 return(error);
1024 }
1025
1026 /*ARGSUSED*/
1027 int
1028 coda_create(struct vop_create_args *ap)
1029 {
1030 /* true args */
1031 struct vnode *dvp = ap->a_dvp;
1032 struct cnode *dcp = VTOC(dvp);
1033 struct vattr *va = ap->a_vap;
1034 int exclusive = 1;
1035 int mode = ap->a_vap->va_mode;
1036 struct vnode **vpp = ap->a_vpp;
1037 struct componentname *cnp = ap->a_cnp;
1038 struct ucred *cred = cnp->cn_cred;
1039 struct thread *td = cnp->cn_thread;
1040 /* locals */
1041 int error;
1042 struct cnode *cp;
1043 const char *nm = cnp->cn_nameptr;
1044 int len = cnp->cn_namelen;
1045 CodaFid VFid;
1046 struct vattr attr;
1047
1048 MARK_ENTRY(CODA_CREATE_STATS);
1049
1050 /* All creates are exclusive XXX */
1051 /* I'm assuming the 'mode' argument is the file mode bits XXX */
1052
1053 /* Check for create of control object. */
1054 if (IS_CTL_NAME(dvp, nm, len)) {
1055 *vpp = (struct vnode *)0;
1056 MARK_INT_FAIL(CODA_CREATE_STATS);
1057 return(EACCES);
1058 }
1059
1060 error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive, mode, va, cred, td->td_proc, &VFid, &attr);
1061
1062 if (!error) {
1063
1064 /* If this is an exclusive create, panic if the file already exists. */
1065 /* Venus should have detected the file and reported EEXIST. */
1066
1067 if ((exclusive == 1) &&
1068 (coda_find(&VFid) != NULL))
1069 panic("cnode existed for newly created file!");
1070
1071 cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type);
1072 *vpp = CTOV(cp);
1073
1074 /* Update va to reflect the new attributes. */
1075 (*va) = attr;
1076
1077 /* Update the attribute cache and mark it as valid */
1078 if (coda_attr_cache) {
1079 VTOC(*vpp)->c_vattr = attr;
1080 VTOC(*vpp)->c_flags |= C_VATTR;
1081 }
1082
1083 /* Invalidate the parent's attr cache, the modification time has changed */
1084 VTOC(dvp)->c_flags &= ~C_VATTR;
1085
1086 /* enter the new vnode in the Name Cache */
1087 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
1088
1089 CODADEBUG(CODA_CREATE,
1090 myprintf(("create: %s, result %d\n",
1091 coda_f2s(&VFid), error)); )
1092 } else {
1093 *vpp = (struct vnode *)0;
1094 CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));)
1095 }
1096
1097 if (!error) {
1098 if (cnp->cn_flags & LOCKLEAF) {
1099 if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
1100 printf("coda_create: ");
1101 panic("unlocked parent but couldn't lock child");
1102 }
1103 }
1104 #ifdef OLD_DIAGNOSTIC
1105 else {
1106 printf("coda_create: LOCKLEAF not set!\n");
1107 }
1108 #endif
1109 }
1110 return(error);
1111 }
1112
1113 int
1114 coda_remove(struct vop_remove_args *ap)
1115 {
1116 /* true args */
1117 struct vnode *dvp = ap->a_dvp;
1118 struct cnode *cp = VTOC(dvp);
1119 struct componentname *cnp = ap->a_cnp;
1120 struct ucred *cred = cnp->cn_cred;
1121 struct thread *td = cnp->cn_thread;
1122 /* locals */
1123 int error;
1124 const char *nm = cnp->cn_nameptr;
1125 int len = cnp->cn_namelen;
1126 struct cnode *tp;
1127
1128 MARK_ENTRY(CODA_REMOVE_STATS);
1129
1130 CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n",
1131 nm, coda_f2s(&cp->c_fid))););
1132 /* Remove the file's entry from the CODA Name Cache */
1133 /* We're being conservative here, it might be that this person
1134 * doesn't really have sufficient access to delete the file
1135 * but we feel zapping the entry won't really hurt anyone -- dcs
1136 */
1137 /* I'm gonna go out on a limb here. If a file and a hardlink to it
1138 * exist, and one is removed, the link count on the other will be
1139 * off by 1. We could either invalidate the attrs if cached, or
1140 * fix them. I'll try to fix them. DCS 11/8/94
1141 */
1142 tp = coda_nc_lookup(VTOC(dvp), nm, len, cred);
1143 if (tp) {
1144 if (VALID_VATTR(tp)) { /* If attrs are cached */
1145 if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */
1146 tp->c_vattr.va_nlink--;
1147 }
1148 }
1149
1150 coda_nc_zapfile(VTOC(dvp), nm, len);
1151 /* No need to flush it if it doesn't exist! */
1152 }
1153 /* Invalidate the parent's attr cache, the modification time has changed */
1154 VTOC(dvp)->c_flags &= ~C_VATTR;
1155
1156 /* Check for remove of control object. */
1157 if (IS_CTL_NAME(dvp, nm, len)) {
1158 MARK_INT_FAIL(CODA_REMOVE_STATS);
1159 return(ENOENT);
1160 }
1161
1162 error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, td->td_proc);
1163
1164 CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); )
1165
1166 return(error);
1167 }
1168
1169 int
1170 coda_link(struct vop_link_args *ap)
1171 {
1172 /* true args */
1173 struct vnode *vp = ap->a_vp;
1174 struct cnode *cp = VTOC(vp);
1175 struct vnode *tdvp = ap->a_tdvp;
1176 struct cnode *tdcp = VTOC(tdvp);
1177 struct componentname *cnp = ap->a_cnp;
1178 struct ucred *cred = cnp->cn_cred;
1179 struct thread *td = cnp->cn_thread;
1180 /* locals */
1181 int error;
1182 const char *nm = cnp->cn_nameptr;
1183 int len = cnp->cn_namelen;
1184
1185 MARK_ENTRY(CODA_LINK_STATS);
1186
1187 if (codadebug & CODADBGMSK(CODA_LINK)) {
1188 myprintf(("nb_link: vp fid: %s\n",
1189 coda_f2s(&cp->c_fid)));
1190 myprintf(("nb_link: tdvp fid: %s)\n",
1191 coda_f2s(&tdcp->c_fid)));
1192 }
1193 if (codadebug & CODADBGMSK(CODA_LINK)) {
1194 myprintf(("link: vp fid: %s\n",
1195 coda_f2s(&cp->c_fid)));
1196 myprintf(("link: tdvp fid: %s\n",
1197 coda_f2s(&tdcp->c_fid)));
1198 }
1199
1200 /* Check for link to/from control object. */
1201 if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) {
1202 MARK_INT_FAIL(CODA_LINK_STATS);
1203 return(EACCES);
1204 }
1205
1206 error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len, cred, td->td_proc);
1207
1208 /* Invalidate the parent's attr cache, the modification time has changed */
1209 VTOC(tdvp)->c_flags &= ~C_VATTR;
1210 VTOC(vp)->c_flags &= ~C_VATTR;
1211
1212 CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)); )
1213
1214 return(error);
1215 }
1216
1217 int
1218 coda_rename(struct vop_rename_args *ap)
1219 {
1220 /* true args */
1221 struct vnode *odvp = ap->a_fdvp;
1222 struct cnode *odcp = VTOC(odvp);
1223 struct componentname *fcnp = ap->a_fcnp;
1224 struct vnode *ndvp = ap->a_tdvp;
1225 struct cnode *ndcp = VTOC(ndvp);
1226 struct componentname *tcnp = ap->a_tcnp;
1227 struct ucred *cred = fcnp->cn_cred;
1228 struct thread *td = fcnp->cn_thread;
1229 /* true args */
1230 int error;
1231 const char *fnm = fcnp->cn_nameptr;
1232 int flen = fcnp->cn_namelen;
1233 const char *tnm = tcnp->cn_nameptr;
1234 int tlen = tcnp->cn_namelen;
1235
1236 MARK_ENTRY(CODA_RENAME_STATS);
1237
1238 /* Hmmm. The vnodes are already looked up. Perhaps they are locked?
1239 This could be Bad. XXX */
1240 #ifdef OLD_DIAGNOSTIC
1241 if ((fcnp->cn_cred != tcnp->cn_cred)
1242 || (fcnp->cn_thread != tcnp->cn_thread))
1243 {
1244 panic("coda_rename: component names don't agree");
1245 }
1246 #endif
1247
1248 /* Check for rename involving control object. */
1249 if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) {
1250 MARK_INT_FAIL(CODA_RENAME_STATS);
1251 return(EACCES);
1252 }
1253
1254 /* Problem with moving directories -- need to flush entry for .. */
1255 if (odvp != ndvp) {
1256 struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred);
1257 if (ovcp) {
1258 struct vnode *ovp = CTOV(ovcp);
1259 if ((ovp) &&
1260 (ovp->v_type == VDIR)) /* If it's a directory */
1261 coda_nc_zapfile(VTOC(ovp),"..", 2);
1262 }
1263 }
1264
1265 /* Remove the entries for both source and target files */
1266 coda_nc_zapfile(VTOC(odvp), fnm, flen);
1267 coda_nc_zapfile(VTOC(ndvp), tnm, tlen);
1268
1269 /* Invalidate the parent's attr cache, the modification time has changed */
1270 VTOC(odvp)->c_flags &= ~C_VATTR;
1271 VTOC(ndvp)->c_flags &= ~C_VATTR;
1272
1273 if (flen+1 > CODA_MAXNAMLEN) {
1274 MARK_INT_FAIL(CODA_RENAME_STATS);
1275 error = EINVAL;
1276 goto exit;
1277 }
1278
1279 if (tlen+1 > CODA_MAXNAMLEN) {
1280 MARK_INT_FAIL(CODA_RENAME_STATS);
1281 error = EINVAL;
1282 goto exit;
1283 }
1284
1285 error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm, flen, tnm, tlen, cred, td->td_proc);
1286
1287 exit:
1288 CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error));)
1289 /* XXX - do we need to call cache pureg on the moved vnode? */
1290 cache_purge(ap->a_fvp);
1291
1292 /* Release parents first, then children. */
1293 vrele(odvp);
1294 if (ap->a_tvp) {
1295 if (ap->a_tvp == ndvp)
1296 vrele(ndvp);
1297 else
1298 vput(ndvp);
1299 vput(ap->a_tvp);
1300 } else
1301 vput(ndvp);
1302 vrele(ap->a_fvp);
1303
1304 return(error);
1305 }
1306
1307 int
1308 coda_mkdir(struct vop_mkdir_args *ap)
1309 {
1310 /* true args */
1311 struct vnode *dvp = ap->a_dvp;
1312 struct cnode *dcp = VTOC(dvp);
1313 struct componentname *cnp = ap->a_cnp;
1314 register struct vattr *va = ap->a_vap;
1315 struct vnode **vpp = ap->a_vpp;
1316 struct ucred *cred = cnp->cn_cred;
1317 struct thread *td = cnp->cn_thread;
1318 /* locals */
1319 int error;
1320 const char *nm = cnp->cn_nameptr;
1321 int len = cnp->cn_namelen;
1322 struct cnode *cp;
1323 CodaFid VFid;
1324 struct vattr ova;
1325
1326 MARK_ENTRY(CODA_MKDIR_STATS);
1327
1328 /* Check for mkdir of target object. */
1329 if (IS_CTL_NAME(dvp, nm, len)) {
1330 *vpp = (struct vnode *)0;
1331 MARK_INT_FAIL(CODA_MKDIR_STATS);
1332 return(EACCES);
1333 }
1334
1335 if (len+1 > CODA_MAXNAMLEN) {
1336 *vpp = (struct vnode *)0;
1337 MARK_INT_FAIL(CODA_MKDIR_STATS);
1338 return(EACCES);
1339 }
1340
1341 error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred, td->td_proc, &VFid, &ova);
1342
1343 if (!error) {
1344 if (coda_find(&VFid) != NULL)
1345 panic("cnode existed for newly created directory!");
1346
1347
1348 cp = make_coda_node(&VFid, dvp->v_mount, va->va_type);
1349 *vpp = CTOV(cp);
1350
1351 /* enter the new vnode in the Name Cache */
1352 coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
1353
1354 /* as a side effect, enter "." and ".." for the directory */
1355 coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp));
1356 coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp));
1357
1358 if (coda_attr_cache) {
1359 VTOC(*vpp)->c_vattr = ova; /* update the attr cache */
1360 VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */
1361 }
1362
1363 /* Invalidate the parent's attr cache, the modification time has changed */
1364 VTOC(dvp)->c_flags &= ~C_VATTR;
1365
1366 CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n",
1367 coda_f2s(&VFid), error)); )
1368 } else {
1369 *vpp = (struct vnode *)0;
1370 CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));)
1371 }
1372
1373 return(error);
1374 }
1375
1376 int
1377 coda_rmdir(struct vop_rmdir_args *ap)
1378 {
1379 /* true args */
1380 struct vnode *dvp = ap->a_dvp;
1381 struct cnode *dcp = VTOC(dvp);
1382 struct componentname *cnp = ap->a_cnp;
1383 struct ucred *cred = cnp->cn_cred;
1384 struct thread *td = cnp->cn_thread;
1385 /* true args */
1386 int error;
1387 const char *nm = cnp->cn_nameptr;
1388 int len = cnp->cn_namelen;
1389 struct cnode *cp;
1390
1391 MARK_ENTRY(CODA_RMDIR_STATS);
1392
1393 /* Check for rmdir of control object. */
1394 if (IS_CTL_NAME(dvp, nm, len)) {
1395 MARK_INT_FAIL(CODA_RMDIR_STATS);
1396 return(ENOENT);
1397 }
1398
1399 /* We're being conservative here, it might be that this person
1400 * doesn't really have sufficient access to delete the file
1401 * but we feel zapping the entry won't really hurt anyone -- dcs
1402 */
1403 /*
1404 * As a side effect of the rmdir, remove any entries for children of
1405 * the directory, especially "." and "..".
1406 */
1407 cp = coda_nc_lookup(dcp, nm, len, cred);
1408 if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL);
1409
1410 /* Remove the file's entry from the CODA Name Cache */
1411 coda_nc_zapfile(dcp, nm, len);
1412
1413 /* Invalidate the parent's attr cache, the modification time has changed */
1414 dcp->c_flags &= ~C_VATTR;
1415
1416 error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred, td->td_proc);
1417
1418 CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)); )
1419
1420 return(error);
1421 }
1422
1423 int
1424 coda_symlink(struct vop_symlink_args *ap)
1425 {
1426 /* true args */
1427 struct vnode *tdvp = ap->a_dvp;
1428 struct cnode *tdcp = VTOC(tdvp);
1429 struct componentname *cnp = ap->a_cnp;
1430 struct vattr *tva = ap->a_vap;
1431 char *path = ap->a_target;
1432 struct ucred *cred = cnp->cn_cred;
1433 struct thread *td = cnp->cn_thread;
1434 struct vnode **vpp = ap->a_vpp;
1435 /* locals */
1436 int error;
1437 /*
1438 * XXX I'm assuming the following things about coda_symlink's
1439 * arguments:
1440 * t(foo) is the new name/parent/etc being created.
1441 * lname is the contents of the new symlink.
1442 */
1443 char *nm = cnp->cn_nameptr;
1444 int len = cnp->cn_namelen;
1445 int plen = strlen(path);
1446
1447 /*
1448 * Here's the strategy for the moment: perform the symlink, then
1449 * do a lookup to grab the resulting vnode. I know this requires
1450 * two communications with Venus for a new sybolic link, but
1451 * that's the way the ball bounces. I don't yet want to change
1452 * the way the Mach symlink works. When Mach support is
1453 * deprecated, we should change symlink so that the common case
1454 * returns the resultant vnode in a vpp argument.
1455 */
1456
1457 MARK_ENTRY(CODA_SYMLINK_STATS);
1458
1459 /* Check for symlink of control object. */
1460 if (IS_CTL_NAME(tdvp, nm, len)) {
1461 MARK_INT_FAIL(CODA_SYMLINK_STATS);
1462 return(EACCES);
1463 }
1464
1465 if (plen+1 > CODA_MAXPATHLEN) {
1466 MARK_INT_FAIL(CODA_SYMLINK_STATS);
1467 return(EINVAL);
1468 }
1469
1470 if (len+1 > CODA_MAXNAMLEN) {
1471 MARK_INT_FAIL(CODA_SYMLINK_STATS);
1472 error = EINVAL;
1473 goto exit;
1474 }
1475
1476 error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len, tva, cred, td->td_proc);
1477
1478 /* Invalidate the parent's attr cache, the modification time has changed */
1479 tdcp->c_flags &= ~C_VATTR;
1480
1481 if (error == 0)
1482 error = VOP_LOOKUP(tdvp, vpp, cnp);
1483
1484 exit:
1485 CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)); )
1486 return(error);
1487 }
1488
1489 /*
1490 * Read directory entries.
1491 */
1492 int
1493 coda_readdir(struct vop_readdir_args *ap)
1494 {
1495 /* true args */
1496 struct vnode *vp = ap->a_vp;
1497 struct cnode *cp = VTOC(vp);
1498 register struct uio *uiop = ap->a_uio;
1499 struct ucred *cred = ap->a_cred;
1500 int *eofflag = ap->a_eofflag;
1501 u_long **cookies = ap->a_cookies;
1502 int *ncookies = ap->a_ncookies;
1503 struct thread *td = ap->a_uio->uio_td;
1504 /* upcall decl */
1505 /* locals */
1506 int error = 0;
1507
1508 MARK_ENTRY(CODA_READDIR_STATS);
1509
1510 CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %d, %lld, %d)\n",
1511 (void *)uiop->uio_iov->iov_base,
1512 uiop->uio_resid,
1513 (long long)uiop->uio_offset,
1514 uiop->uio_segflg)); )
1515
1516 /* Check for readdir of control object. */
1517 if (IS_CTL_VP(vp)) {
1518 MARK_INT_FAIL(CODA_READDIR_STATS);
1519 return(ENOENT);
1520 }
1521
1522 {
1523 /* If directory is not already open do an "internal open" on it. */
1524 int opened_internally = 0;
1525 if (cp->c_ovp == NULL) {
1526 opened_internally = 1;
1527 MARK_INT_GEN(CODA_OPEN_STATS);
1528 error = VOP_OPEN(vp, FREAD, cred, td, -1);
1529 printf("coda_readdir: Internally Opening %p\n", vp);
1530 if (error) {
1531 printf("coda_readdir: VOP_OPEN on container failed %d\n", error);
1532 return (error);
1533 }
1534 }
1535
1536 /* Have UFS handle the call. */
1537 CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = %s, refcnt = %d\n", coda_f2s(&cp->c_fid), vp->v_usecount)); )
1538 error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, ncookies,
1539 cookies);
1540
1541 if (error)
1542 MARK_INT_FAIL(CODA_READDIR_STATS);
1543 else
1544 MARK_INT_SAT(CODA_READDIR_STATS);
1545
1546 /* Do an "internal close" if necessary. */
1547 if (opened_internally) {
1548 MARK_INT_GEN(CODA_CLOSE_STATS);
1549 (void)VOP_CLOSE(vp, FREAD, cred, td);
1550 }
1551 }
1552
1553 return(error);
1554 }
1555
1556 /*
1557 * Convert from filesystem blocks to device blocks
1558 */
1559 int
1560 coda_bmap(struct vop_bmap_args *ap)
1561 {
1562 /* XXX on the global proc */
1563 /* true args */
1564 struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */
1565 daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */
1566 struct bufobj **bop = ap->a_bop; /* RETURN bufobj of device */
1567 daddr_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */
1568 struct thread *td __attribute__((unused)) = curthread;
1569 /* upcall decl */
1570 /* locals */
1571
1572 int ret = 0;
1573 struct cnode *cp;
1574
1575 cp = VTOC(vp);
1576 if (cp->c_ovp) {
1577 return EINVAL;
1578 ret = VOP_BMAP(cp->c_ovp, bn, bop, bnp, ap->a_runp, ap->a_runb);
1579 #if 0
1580 printf("VOP_BMAP(cp->c_ovp %p, bn %p, bop %p, bnp %lld, ap->a_runp %p, ap->a_runb %p) = %d\n",
1581 cp->c_ovp, bn, bop, bnp, ap->a_runp, ap->a_runb, ret);
1582 #endif
1583 return ret;
1584 } else {
1585 #if 0
1586 printf("coda_bmap: no container\n");
1587 #endif
1588 return(EOPNOTSUPP);
1589 }
1590 }
1591
1592 int
1593 coda_reclaim(struct vop_reclaim_args *ap)
1594 {
1595 /* true args */
1596 struct vnode *vp = ap->a_vp;
1597 struct cnode *cp = VTOC(vp);
1598 /* upcall decl */
1599 /* locals */
1600
1601 /*
1602 * Forced unmount/flush will let vnodes with non zero use be destroyed!
1603 */
1604 ENTRY;
1605
1606 if (IS_UNMOUNTING(cp)) {
1607 #ifdef DEBUG
1608 if (VTOC(vp)->c_ovp) {
1609 if (IS_UNMOUNTING(cp))
1610 printf("coda_reclaim: c_ovp not void: vp %p, cp %p\n", vp, cp);
1611 }
1612 #endif
1613 } else {
1614 #ifdef OLD_DIAGNOSTIC
1615 if (vrefcnt(vp) != 0)
1616 print("coda_reclaim: pushing active %p\n", vp);
1617 if (VTOC(vp)->c_ovp) {
1618 panic("coda_reclaim: c_ovp not void");
1619 }
1620 #endif
1621 }
1622 cache_purge(vp);
1623 coda_free(VTOC(vp));
1624 vp->v_data = NULL;
1625 vnode_destroy_vobject(vp);
1626 return (0);
1627 }
1628
1629 int
1630 coda_lock(struct vop_lock_args *ap)
1631 {
1632 /* true args */
1633 struct vnode *vp = ap->a_vp;
1634 struct cnode *cp = VTOC(vp);
1635 /* upcall decl */
1636 /* locals */
1637
1638 ENTRY;
1639
1640 if ((ap->a_flags & LK_INTERLOCK) == 0) {
1641 VI_LOCK(vp);
1642 ap->a_flags |= LK_INTERLOCK;
1643 }
1644
1645 if (coda_lockdebug) {
1646 myprintf(("Attempting lock on %s\n",
1647 coda_f2s(&cp->c_fid)));
1648 }
1649
1650 return (vop_stdlock(ap));
1651 }
1652
1653 int
1654 coda_unlock(struct vop_unlock_args *ap)
1655 {
1656 /* true args */
1657 struct vnode *vp = ap->a_vp;
1658 struct cnode *cp = VTOC(vp);
1659 /* upcall decl */
1660 /* locals */
1661
1662 ENTRY;
1663 if (coda_lockdebug) {
1664 myprintf(("Attempting unlock on %s\n",
1665 coda_f2s(&cp->c_fid)));
1666 }
1667
1668 return (vop_stdunlock(ap));
1669 }
1670
1671 int
1672 coda_islocked(struct vop_islocked_args *ap)
1673 {
1674 /* true args */
1675 ENTRY;
1676
1677 return (vop_stdislocked(ap));
1678 }
1679
1680 /* How one looks up a vnode given a device/inode pair: */
1681 int
1682 coda_grab_vnode(struct cdev *dev, ino_t ino, struct vnode **vpp)
1683 {
1684 /* This is like VFS_VGET() or igetinode()! */
1685 int error;
1686 struct mount *mp;
1687
1688 if (!(mp = devtomp(dev))) {
1689 myprintf(("coda_grab_vnode: devtomp(%#lx) returns NULL\n",
1690 (u_long)dev2udev(dev)));
1691 return(ENXIO);
1692 }
1693
1694 /* XXX - ensure that nonzero-return means failure */
1695 error = VFS_VGET(mp,ino,LK_EXCLUSIVE,vpp);
1696 if (error) {
1697 myprintf(("coda_grab_vnode: iget/vget(%lx, %lu) returns %p, err %d\n",
1698 (u_long)dev2udev(dev), (u_long)ino, (void *)*vpp, error));
1699 return(ENOENT);
1700 }
1701 return(0);
1702 }
1703
1704 void
1705 print_vattr(struct vattr *attr)
1706 {
1707 char *typestr;
1708
1709 switch (attr->va_type) {
1710 case VNON:
1711 typestr = "VNON";
1712 break;
1713 case VREG:
1714 typestr = "VREG";
1715 break;
1716 case VDIR:
1717 typestr = "VDIR";
1718 break;
1719 case VBLK:
1720 typestr = "VBLK";
1721 break;
1722 case VCHR:
1723 typestr = "VCHR";
1724 break;
1725 case VLNK:
1726 typestr = "VLNK";
1727 break;
1728 case VSOCK:
1729 typestr = "VSCK";
1730 break;
1731 case VFIFO:
1732 typestr = "VFFO";
1733 break;
1734 case VBAD:
1735 typestr = "VBAD";
1736 break;
1737 default:
1738 typestr = "????";
1739 break;
1740 }
1741
1742
1743 myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n",
1744 typestr, (int)attr->va_mode, (int)attr->va_uid,
1745 (int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev));
1746
1747 myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n",
1748 (int)attr->va_fileid, (int)attr->va_nlink,
1749 (int)attr->va_size,
1750 (int)attr->va_blocksize,(int)attr->va_bytes));
1751 myprintf((" gen %ld flags %ld vaflags %d\n",
1752 attr->va_gen, attr->va_flags, attr->va_vaflags));
1753 myprintf((" atime sec %d nsec %d\n",
1754 (int)attr->va_atime.tv_sec, (int)attr->va_atime.tv_nsec));
1755 myprintf((" mtime sec %d nsec %d\n",
1756 (int)attr->va_mtime.tv_sec, (int)attr->va_mtime.tv_nsec));
1757 myprintf((" ctime sec %d nsec %d\n",
1758 (int)attr->va_ctime.tv_sec, (int)attr->va_ctime.tv_nsec));
1759 }
1760
1761 /* How to print a ucred */
1762 void
1763 print_cred(struct ucred *cred)
1764 {
1765
1766 int i;
1767
1768 myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid));
1769
1770 for (i=0; i < cred->cr_ngroups; i++)
1771 myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[i]));
1772 myprintf(("\n"));
1773
1774 }
1775
1776 /*
1777 * Return a vnode for the given fid.
1778 * If no cnode exists for this fid create one and put it
1779 * in a table hashed by coda_f2i(). If the cnode for
1780 * this fid is already in the table return it (ref count is
1781 * incremented by coda_find. The cnode will be flushed from the
1782 * table when coda_inactive calls coda_unsave.
1783 */
1784 struct cnode *
1785 make_coda_node(CodaFid *fid, struct mount *vfsp, short type)
1786 {
1787 struct cnode *cp;
1788 int err;
1789
1790 if ((cp = coda_find(fid)) == NULL) {
1791 struct vnode *vp;
1792
1793 cp = coda_alloc();
1794 cp->c_fid = *fid;
1795
1796 err = getnewvnode("coda", vfsp, &coda_vnodeops, &vp);
1797 if (err) {
1798 panic("coda: getnewvnode returned error %d\n", err);
1799 }
1800 vp->v_data = cp;
1801 vp->v_type = type;
1802 cp->c_vnode = vp;
1803 coda_save(cp);
1804
1805 } else {
1806 vref(CTOV(cp));
1807 }
1808
1809 return cp;
1810 }
1811
1812 int
1813 coda_pathconf(struct vop_pathconf_args *ap)
1814 {
1815 int error;
1816 register_t *retval;
1817
1818 retval = ap->a_retval;
1819 error = 0;
1820
1821 switch (ap->a_name) {
1822 case _PC_NAME_MAX:
1823 *retval = CODA_MAXNAMLEN;
1824 break;
1825 case _PC_PATH_MAX:
1826 *retval = CODA_MAXPATHLEN;
1827 break;
1828 default:
1829 error = vop_stdpathconf(ap);
1830 break;
1831 }
1832
1833 return (error);
1834 }
Cache object: 53c4e833e451ce4e6ab258ed244bd924
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