1 /* $NetBSD: coda_vfsops.c,v 1.66 2008/05/10 02:26:09 rumble 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 * @(#) cfs/coda_vfsops.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
47 #include <sys/cdefs.h>
48 __KERNEL_RCSID(0, "$NetBSD: coda_vfsops.c,v 1.66 2008/05/10 02:26:09 rumble Exp $");
49
50 #ifdef _LKM
51 #define NVCODA 4
52 #else
53 #include <vcoda.h>
54 #endif
55
56 #include <sys/param.h>
57 #include <sys/systm.h>
58 #include <sys/sysctl.h>
59 #include <sys/malloc.h>
60 #include <sys/conf.h>
61 #include <sys/namei.h>
62 #include <sys/dirent.h>
63 #include <sys/mount.h>
64 #include <sys/proc.h>
65 #include <sys/select.h>
66 #include <sys/kauth.h>
67 #include <sys/module.h>
68
69 #include <coda/coda.h>
70 #include <coda/cnode.h>
71 #include <coda/coda_vfsops.h>
72 #include <coda/coda_venus.h>
73 #include <coda/coda_subr.h>
74 #include <coda/coda_opstats.h>
75 /* for VN_RDEV */
76 #include <miscfs/specfs/specdev.h>
77 #include <miscfs/genfs/genfs.h>
78
79 MODULE(MODULE_CLASS_VFS, coda, NULL);
80
81 MALLOC_DEFINE(M_CODA, "coda", "Coda file system structures and tables");
82
83 int codadebug = 0;
84
85 int coda_vfsop_print_entry = 0;
86 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
87
88 struct vnode *coda_ctlvp;
89 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
90
91 /* structure to keep statistics of internally generated/satisfied calls */
92
93 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
94
95 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
96 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
97 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
98 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
99
100 extern const struct cdevsw vcoda_cdevsw;
101 extern const struct vnodeopv_desc coda_vnodeop_opv_desc;
102
103 const struct vnodeopv_desc * const coda_vnodeopv_descs[] = {
104 &coda_vnodeop_opv_desc,
105 NULL,
106 };
107
108 struct vfsops coda_vfsops = {
109 MOUNT_CODA,
110 256, /* This is the pathname, unlike every other fs */
111 coda_mount,
112 coda_start,
113 coda_unmount,
114 coda_root,
115 (void *)eopnotsupp, /* vfs_quotactl */
116 coda_nb_statvfs,
117 coda_sync,
118 coda_vget,
119 (void *)eopnotsupp, /* vfs_fhtovp */
120 (void *)eopnotsupp, /* vfs_vptofh */
121 coda_init,
122 NULL, /* vfs_reinit */
123 coda_done,
124 (int (*)(void)) eopnotsupp,
125 (int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
126 vfs_stdextattrctl,
127 (void *)eopnotsupp, /* vfs_suspendctl */
128 genfs_renamelock_enter,
129 genfs_renamelock_exit,
130 (void *)eopnotsupp,
131 coda_vnodeopv_descs,
132 0, /* vfs_refcount */
133 { NULL, NULL }, /* vfs_list */
134 };
135
136 static int
137 coda_modcmd(modcmd_t cmd, void *arg)
138 {
139
140 switch (cmd) {
141 case MODULE_CMD_INIT:
142 return vfs_attach(&coda_vfsops);
143 case MODULE_CMD_FINI:
144 return vfs_detach(&coda_vfsops);
145 default:
146 return ENOTTY;
147 }
148 }
149
150 int
151 coda_vfsopstats_init(void)
152 {
153 int i;
154
155 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
156 coda_vfsopstats[i].opcode = i;
157 coda_vfsopstats[i].entries = 0;
158 coda_vfsopstats[i].sat_intrn = 0;
159 coda_vfsopstats[i].unsat_intrn = 0;
160 coda_vfsopstats[i].gen_intrn = 0;
161 }
162
163 return 0;
164 }
165
166 /*
167 * cfs mount vfsop
168 * Set up mount info record and attach it to vfs struct.
169 */
170 /*ARGSUSED*/
171 int
172 coda_mount(struct mount *vfsp, /* Allocated and initialized by mount(2) */
173 const char *path, /* path covered: ignored by the fs-layer */
174 void *data, /* Need to define a data type for this in netbsd? */
175 size_t *data_len)
176 {
177 struct lwp *l = curlwp;
178 struct nameidata nd;
179 struct vnode *dvp;
180 struct cnode *cp;
181 dev_t dev;
182 struct coda_mntinfo *mi;
183 struct vnode *rtvp;
184 const struct cdevsw *cdev;
185 CodaFid rootfid = INVAL_FID;
186 CodaFid ctlfid = CTL_FID;
187 int error;
188
189 if (vfsp->mnt_flag & MNT_GETARGS)
190 return EINVAL;
191 ENTRY;
192
193 coda_vfsopstats_init();
194 coda_vnodeopstats_init();
195
196 MARK_ENTRY(CODA_MOUNT_STATS);
197 if (CODA_MOUNTED(vfsp)) {
198 MARK_INT_FAIL(CODA_MOUNT_STATS);
199 return(EBUSY);
200 }
201
202 /* Validate mount device. Similar to getmdev(). */
203
204 /*
205 * XXX: coda passes the mount device as the entire mount args,
206 * All other fs pass a structure contining a pointer.
207 * In order to get sys_mount() to do the copyin() we've set a
208 * fixed default size for the filename buffer.
209 */
210 /* Ensure that namei() doesn't run off the filename buffer */
211 ((char *)data)[*data_len - 1] = 0;
212 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, data);
213 error = namei(&nd);
214 dvp = nd.ni_vp;
215
216 if (error) {
217 MARK_INT_FAIL(CODA_MOUNT_STATS);
218 return (error);
219 }
220 if (dvp->v_type != VCHR) {
221 MARK_INT_FAIL(CODA_MOUNT_STATS);
222 vrele(dvp);
223 return(ENXIO);
224 }
225 dev = dvp->v_rdev;
226 vrele(dvp);
227 cdev = cdevsw_lookup(dev);
228 if (cdev == NULL) {
229 MARK_INT_FAIL(CODA_MOUNT_STATS);
230 return(ENXIO);
231 }
232
233 /*
234 * See if the device table matches our expectations.
235 */
236 if (cdev != &vcoda_cdevsw)
237 {
238 MARK_INT_FAIL(CODA_MOUNT_STATS);
239 return(ENXIO);
240 }
241
242 if (minor(dev) >= NVCODA || minor(dev) < 0) {
243 MARK_INT_FAIL(CODA_MOUNT_STATS);
244 return(ENXIO);
245 }
246
247 /*
248 * Initialize the mount record and link it to the vfs struct
249 */
250 mi = &coda_mnttbl[minor(dev)];
251
252 if (!VC_OPEN(&mi->mi_vcomm)) {
253 MARK_INT_FAIL(CODA_MOUNT_STATS);
254 return(ENODEV);
255 }
256
257 /* No initialization (here) of mi_vcomm! */
258 vfsp->mnt_data = mi;
259 vfsp->mnt_stat.f_fsidx.__fsid_val[0] = 0;
260 vfsp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CODA);
261 vfsp->mnt_stat.f_fsid = vfsp->mnt_stat.f_fsidx.__fsid_val[0];
262 vfsp->mnt_stat.f_namemax = MAXNAMLEN;
263 mi->mi_vfsp = vfsp;
264
265 /*
266 * Make a root vnode to placate the Vnode interface, but don't
267 * actually make the CODA_ROOT call to venus until the first call
268 * to coda_root in case a server is down while venus is starting.
269 */
270 cp = make_coda_node(&rootfid, vfsp, VDIR);
271 rtvp = CTOV(cp);
272 rtvp->v_vflag |= VV_ROOT;
273
274 /* cp = make_coda_node(&ctlfid, vfsp, VCHR);
275 The above code seems to cause a loop in the cnode links.
276 I don't totally understand when it happens, it is caught
277 when closing down the system.
278 */
279 cp = make_coda_node(&ctlfid, 0, VCHR);
280
281 coda_ctlvp = CTOV(cp);
282
283 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
284 mi->mi_vfsp = vfsp;
285 mi->mi_rootvp = rtvp;
286
287 /* set filesystem block size */
288 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
289 vfsp->mnt_stat.f_frsize = 8192; /* XXX -JJK */
290
291 /* error is currently guaranteed to be zero, but in case some
292 code changes... */
293 CODADEBUG(1,
294 myprintf(("coda_mount returned %d\n",error)););
295 if (error)
296 MARK_INT_FAIL(CODA_MOUNT_STATS);
297 else
298 MARK_INT_SAT(CODA_MOUNT_STATS);
299
300 return set_statvfs_info("/coda", UIO_SYSSPACE, "CODA", UIO_SYSSPACE,
301 vfsp->mnt_op->vfs_name, vfsp, l);
302 }
303
304 int
305 coda_start(struct mount *vfsp, int flags)
306 {
307 ENTRY;
308 vftomi(vfsp)->mi_started = 1;
309 return (0);
310 }
311
312 int
313 coda_unmount(struct mount *vfsp, int mntflags)
314 {
315 struct coda_mntinfo *mi = vftomi(vfsp);
316 int active, error = 0;
317
318 ENTRY;
319 MARK_ENTRY(CODA_UMOUNT_STATS);
320 if (!CODA_MOUNTED(vfsp)) {
321 MARK_INT_FAIL(CODA_UMOUNT_STATS);
322 return(EINVAL);
323 }
324
325 if (mi->mi_vfsp == vfsp) { /* We found the victim */
326 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
327 return (EBUSY); /* Venus is still running */
328
329 #ifdef DEBUG
330 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
331 #endif
332 mi->mi_started = 0;
333
334 vrele(mi->mi_rootvp);
335
336 active = coda_kill(vfsp, NOT_DOWNCALL);
337 mi->mi_rootvp->v_vflag &= ~VV_ROOT;
338 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
339 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
340 error = 0;
341
342 /* I'm going to take this out to allow lookups to go through. I'm
343 * not sure it's important anyway. -- DCS 2/2/94
344 */
345 /* vfsp->VFS_DATA = NULL; */
346
347 /* No more vfsp's to hold onto */
348 mi->mi_vfsp = NULL;
349 mi->mi_rootvp = NULL;
350
351 if (error)
352 MARK_INT_FAIL(CODA_UMOUNT_STATS);
353 else
354 MARK_INT_SAT(CODA_UMOUNT_STATS);
355
356 return(error);
357 }
358 return (EINVAL);
359 }
360
361 /*
362 * find root of cfs
363 */
364 int
365 coda_root(struct mount *vfsp, struct vnode **vpp)
366 {
367 struct coda_mntinfo *mi = vftomi(vfsp);
368 int error;
369 struct lwp *l = curlwp; /* XXX - bnoble */
370 CodaFid VFid;
371 static const CodaFid invalfid = INVAL_FID;
372
373 ENTRY;
374 MARK_ENTRY(CODA_ROOT_STATS);
375
376 if (vfsp == mi->mi_vfsp) {
377 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid, sizeof(CodaFid)))
378 { /* Found valid root. */
379 *vpp = mi->mi_rootvp;
380 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
381 vref(*vpp);
382 vn_lock(*vpp, LK_EXCLUSIVE);
383 MARK_INT_SAT(CODA_ROOT_STATS);
384 return(0);
385 }
386 }
387
388 error = venus_root(vftomi(vfsp), l->l_cred, l->l_proc, &VFid);
389
390 if (!error) {
391 /*
392 * Save the new rootfid in the cnode, and rehash the cnode into the
393 * cnode hash with the new fid key.
394 */
395 coda_unsave(VTOC(mi->mi_rootvp));
396 VTOC(mi->mi_rootvp)->c_fid = VFid;
397 coda_save(VTOC(mi->mi_rootvp));
398
399 *vpp = mi->mi_rootvp;
400 vref(*vpp);
401 vn_lock(*vpp, LK_EXCLUSIVE);
402 MARK_INT_SAT(CODA_ROOT_STATS);
403 goto exit;
404 } else if (error == ENODEV || error == EINTR) {
405 /* Gross hack here! */
406 /*
407 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
408 * ENODEV. Return the uninitialized root vnode to allow vfs
409 * operations such as unmount to continue. Without this hack,
410 * there is no way to do an unmount if Venus dies before a
411 * successful CODA_ROOT call is done. All vnode operations
412 * will fail.
413 */
414 *vpp = mi->mi_rootvp;
415 vref(*vpp);
416 vn_lock(*vpp, LK_EXCLUSIVE);
417 MARK_INT_FAIL(CODA_ROOT_STATS);
418 error = 0;
419 goto exit;
420 } else {
421 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
422 MARK_INT_FAIL(CODA_ROOT_STATS);
423
424 goto exit;
425 }
426 exit:
427 return(error);
428 }
429
430 /*
431 * Get file system statistics.
432 */
433 int
434 coda_nb_statvfs(struct mount *vfsp, struct statvfs *sbp)
435 {
436 struct lwp *l = curlwp;
437 struct coda_statfs fsstat;
438 int error;
439
440 ENTRY;
441 MARK_ENTRY(CODA_STATFS_STATS);
442 if (!CODA_MOUNTED(vfsp)) {
443 /* MARK_INT_FAIL(CODA_STATFS_STATS); */
444 return(EINVAL);
445 }
446
447 /* XXX - what to do about f_flags, others? --bnoble */
448 /* Below This is what AFS does
449 #define NB_SFS_SIZ 0x895440
450 */
451 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
452
453 error = venus_statfs(vftomi(vfsp), l->l_cred, l, &fsstat);
454
455 if (!error) {
456 sbp->f_bsize = 8192; /* XXX */
457 sbp->f_frsize = 8192; /* XXX */
458 sbp->f_iosize = 8192; /* XXX */
459 sbp->f_blocks = fsstat.f_blocks;
460 sbp->f_bfree = fsstat.f_bfree;
461 sbp->f_bavail = fsstat.f_bavail;
462 sbp->f_bresvd = 0;
463 sbp->f_files = fsstat.f_files;
464 sbp->f_ffree = fsstat.f_ffree;
465 sbp->f_favail = fsstat.f_ffree;
466 sbp->f_fresvd = 0;
467 copy_statvfs_info(sbp, vfsp);
468 }
469
470 MARK_INT_SAT(CODA_STATFS_STATS);
471 return(error);
472 }
473
474 /*
475 * Flush any pending I/O.
476 */
477 int
478 coda_sync(struct mount *vfsp, int waitfor,
479 kauth_cred_t cred)
480 {
481 ENTRY;
482 MARK_ENTRY(CODA_SYNC_STATS);
483 MARK_INT_SAT(CODA_SYNC_STATS);
484 return(0);
485 }
486
487 int
488 coda_vget(struct mount *vfsp, ino_t ino,
489 struct vnode **vpp)
490 {
491 ENTRY;
492 return (EOPNOTSUPP);
493 }
494
495 /*
496 * fhtovp is now what vget used to be in 4.3-derived systems. For
497 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
498 * a type-specific fid.
499 */
500 int
501 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam,
502 struct vnode **vpp, int *exflagsp,
503 kauth_cred_t *creadanonp)
504 {
505 struct cfid *cfid = (struct cfid *)fhp;
506 struct cnode *cp = 0;
507 int error;
508 struct lwp *l = curlwp; /* XXX -mach */
509 CodaFid VFid;
510 int vtype;
511
512 ENTRY;
513
514 MARK_ENTRY(CODA_VGET_STATS);
515 /* Check for vget of control object. */
516 if (IS_CTL_FID(&cfid->cfid_fid)) {
517 *vpp = coda_ctlvp;
518 vref(coda_ctlvp);
519 MARK_INT_SAT(CODA_VGET_STATS);
520 return(0);
521 }
522
523 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, l->l_cred, l->l_proc, &VFid, &vtype);
524
525 if (error) {
526 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
527 *vpp = (struct vnode *)0;
528 } else {
529 CODADEBUG(CODA_VGET,
530 myprintf(("vget: %s type %d result %d\n",
531 coda_f2s(&VFid), vtype, error)); )
532
533 cp = make_coda_node(&VFid, vfsp, vtype);
534 *vpp = CTOV(cp);
535 }
536 return(error);
537 }
538
539 int
540 coda_vptofh(struct vnode *vnp, struct fid *fidp)
541 {
542 ENTRY;
543 return (EOPNOTSUPP);
544 }
545
546 void
547 coda_init(void)
548 {
549 ENTRY;
550 }
551
552 void
553 coda_done(void)
554 {
555 ENTRY;
556 }
557
558 SYSCTL_SETUP(sysctl_vfs_coda_setup, "sysctl vfs.coda subtree setup")
559 {
560 sysctl_createv(clog, 0, NULL, NULL,
561 CTLFLAG_PERMANENT,
562 CTLTYPE_NODE, "vfs", NULL,
563 NULL, 0, NULL, 0,
564 CTL_VFS, CTL_EOL);
565 sysctl_createv(clog, 0, NULL, NULL,
566 CTLFLAG_PERMANENT,
567 CTLTYPE_NODE, "coda",
568 SYSCTL_DESCR("code vfs options"),
569 NULL, 0, NULL, 0,
570 CTL_VFS, 18, CTL_EOL);
571 /*
572 * XXX the "18" above could be dynamic, thereby eliminating
573 * one more instance of the "number to vfs" mapping problem,
574 * but "18" is the order as taken from sys/mount.h
575 */
576
577 /*
578 sysctl_createv(clog, 0, NULL, NULL,
579 CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
580 CTLTYPE_INT, "clusterread",
581 SYSCTL_DESCR( anyone? ),
582 NULL, 0, &doclusterread, 0,
583 CTL_VFS, 18, FFS_CLUSTERREAD, CTL_EOL);
584 */
585 }
586
587 /*
588 * To allow for greater ease of use, some vnodes may be orphaned when
589 * Venus dies. Certain operations should still be allowed to go
590 * through, but without propagating orphan-ness. So this function will
591 * get a new vnode for the file from the current run of Venus.
592 */
593
594 int
595 getNewVnode(struct vnode **vpp)
596 {
597 struct cfid cfid;
598 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
599
600 ENTRY;
601
602 cfid.cfid_len = (short)sizeof(CodaFid);
603 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
604 /* XXX ? */
605
606 /* We're guessing that if set, the 1st element on the list is a
607 * valid vnode to use. If not, return ENODEV as venus is dead.
608 */
609 if (mi->mi_vfsp == NULL)
610 return ENODEV;
611
612 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
613 NULL, NULL);
614 }
615
616 #include <ufs/ufs/quota.h>
617 #include <ufs/ufs/ufsmount.h>
618 /* get the mount structure corresponding to a given device. Assume
619 * device corresponds to a UFS. Return NULL if no device is found.
620 */
621 struct mount *devtomp(dev_t dev)
622 {
623 struct mount *mp, *nmp;
624
625 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) {
626 nmp = mp->mnt_list.cqe_next;
627 if ((!strcmp(mp->mnt_op->vfs_name, MOUNT_UFS)) &&
628 ((VFSTOUFS(mp))->um_dev == (dev_t) dev)) {
629 /* mount corresponds to UFS and the device matches one we want */
630 return(mp);
631 }
632 }
633 /* mount structure wasn't found */
634 return(NULL);
635 }
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