1 /*
2 *
3 * Coda: an Experimental Distributed File System
4 * Release 3.1
5 *
6 * Copyright (c) 1987-1998 Carnegie Mellon University
7 * All Rights Reserved
8 *
9 * Permission to use, copy, modify and distribute this software and its
10 * documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation, and
14 * that credit is given to Carnegie Mellon University in all documents
15 * and publicity pertaining to direct or indirect use of this code or its
16 * derivatives.
17 *
18 * CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
19 * SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
20 * FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
21 * DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
22 * RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
23 * ANY DERIVATIVE WORK.
24 *
25 * Carnegie Mellon encourages users of this software to return any
26 * improvements or extensions that they make, and to grant Carnegie
27 * Mellon the rights to redistribute these changes without encumbrance.
28 *
29 * @(#) src/sys/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
30 * $FreeBSD: releng/5.0/sys/coda/coda_vfsops.c 101308 2002-08-04 10:29:36Z jeff $
31 *
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 filesystem at Carnegie Mellon
43 * University. Contributers include David Steere, James Kistler, and
44 * M. Satyanarayanan.
45 */
46
47 #include <vcoda.h>
48
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/conf.h>
52 #include <sys/kernel.h>
53 #include <sys/lock.h>
54 #include <sys/malloc.h>
55 #include <sys/mount.h>
56 #include <sys/namei.h>
57 #include <sys/proc.h>
58
59 #include <coda/coda.h>
60 #include <coda/cnode.h>
61 #include <coda/coda_vfsops.h>
62 #include <coda/coda_venus.h>
63 #include <coda/coda_subr.h>
64 #include <coda/coda_opstats.h>
65
66 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
67
68 int codadebug = 0;
69 int coda_vfsop_print_entry = 0;
70 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
71
72 struct vnode *coda_ctlvp;
73 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
74
75 /* structure to keep statistics of internally generated/satisfied calls */
76
77 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
78
79 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
80 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
81 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
82 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
83
84 extern int coda_nc_initialized; /* Set if cache has been initialized */
85 extern int vc_nb_open(dev_t, int, int, struct thread *);
86
87 int
88 coda_vfsopstats_init(void)
89 {
90 register int i;
91
92 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
93 coda_vfsopstats[i].opcode = i;
94 coda_vfsopstats[i].entries = 0;
95 coda_vfsopstats[i].sat_intrn = 0;
96 coda_vfsopstats[i].unsat_intrn = 0;
97 coda_vfsopstats[i].gen_intrn = 0;
98 }
99
100 return 0;
101 }
102
103 /*
104 * cfs mount vfsop
105 * Set up mount info record and attach it to vfs struct.
106 */
107 /*ARGSUSED*/
108 int
109 coda_mount(vfsp, path, data, ndp, td)
110 struct mount *vfsp; /* Allocated and initialized by mount(2) */
111 char *path; /* path covered: ignored by the fs-layer */
112 caddr_t data; /* Need to define a data type for this in netbsd? */
113 struct nameidata *ndp; /* Clobber this to lookup the device name */
114 struct thread *td;
115 {
116 struct vnode *dvp;
117 struct cnode *cp;
118 dev_t dev;
119 struct coda_mntinfo *mi;
120 struct vnode *rootvp;
121 ViceFid rootfid;
122 ViceFid ctlfid;
123 int error;
124
125 ENTRY;
126
127 coda_vfsopstats_init();
128 coda_vnodeopstats_init();
129
130 MARK_ENTRY(CODA_MOUNT_STATS);
131 if (CODA_MOUNTED(vfsp)) {
132 MARK_INT_FAIL(CODA_MOUNT_STATS);
133 return(EBUSY);
134 }
135
136 /* Validate mount device. Similar to getmdev(). */
137 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, td);
138 error = namei(ndp);
139 dvp = ndp->ni_vp;
140
141 if (error) {
142 MARK_INT_FAIL(CODA_MOUNT_STATS);
143 return (error);
144 }
145 if (dvp->v_type != VCHR) {
146 MARK_INT_FAIL(CODA_MOUNT_STATS);
147 vrele(dvp);
148 NDFREE(ndp, NDF_ONLY_PNBUF);
149 return(ENXIO);
150 }
151 dev = dvp->v_rdev;
152 vrele(dvp);
153 NDFREE(ndp, NDF_ONLY_PNBUF);
154
155 /*
156 * See if the device table matches our expectations.
157 */
158 if (devsw(dev)->d_open != vc_nb_open)
159 {
160 MARK_INT_FAIL(CODA_MOUNT_STATS);
161 return(ENXIO);
162 }
163
164 if (minor(dev) >= NVCODA || minor(dev) < 0) {
165 MARK_INT_FAIL(CODA_MOUNT_STATS);
166 return(ENXIO);
167 }
168
169 /*
170 * Initialize the mount record and link it to the vfs struct
171 */
172 mi = &coda_mnttbl[minor(dev)];
173
174 if (!VC_OPEN(&mi->mi_vcomm)) {
175 MARK_INT_FAIL(CODA_MOUNT_STATS);
176 return(ENODEV);
177 }
178
179 /* No initialization (here) of mi_vcomm! */
180 vfsp->mnt_data = (qaddr_t)mi;
181 vfs_getnewfsid (vfsp);
182
183 mi->mi_vfsp = vfsp;
184
185 /*
186 * Make a root vnode to placate the Vnode interface, but don't
187 * actually make the CODA_ROOT call to venus until the first call
188 * to coda_root in case a server is down while venus is starting.
189 */
190 rootfid.Volume = 0;
191 rootfid.Vnode = 0;
192 rootfid.Unique = 0;
193 cp = make_coda_node(&rootfid, vfsp, VDIR);
194 rootvp = CTOV(cp);
195 rootvp->v_vflag |= VV_ROOT;
196
197 ctlfid.Volume = CTL_VOL;
198 ctlfid.Vnode = CTL_VNO;
199 ctlfid.Unique = CTL_UNI;
200 /* cp = make_coda_node(&ctlfid, vfsp, VCHR);
201 The above code seems to cause a loop in the cnode links.
202 I don't totally understand when it happens, it is caught
203 when closing down the system.
204 */
205 cp = make_coda_node(&ctlfid, 0, VCHR);
206
207 coda_ctlvp = CTOV(cp);
208
209 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
210 mi->mi_vfsp = vfsp;
211 mi->mi_rootvp = rootvp;
212
213 /* set filesystem block size */
214 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
215
216 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
217 For vnode_pager_haspage() references. The value should be obtained
218 from underlying UFS. */
219 /* Checked UFS. iosize is set as 8192 */
220 vfsp->mnt_stat.f_iosize = 8192;
221
222 /* error is currently guaranteed to be zero, but in case some
223 code changes... */
224 CODADEBUG(1,
225 myprintf(("coda_mount returned %d\n",error)););
226 if (error)
227 MARK_INT_FAIL(CODA_MOUNT_STATS);
228 else
229 MARK_INT_SAT(CODA_MOUNT_STATS);
230
231 return(error);
232 }
233
234 int
235 coda_unmount(vfsp, mntflags, td)
236 struct mount *vfsp;
237 int mntflags;
238 struct thread *td;
239 {
240 struct coda_mntinfo *mi = vftomi(vfsp);
241 int active, error = 0;
242
243 ENTRY;
244 MARK_ENTRY(CODA_UMOUNT_STATS);
245 if (!CODA_MOUNTED(vfsp)) {
246 MARK_INT_FAIL(CODA_UMOUNT_STATS);
247 return(EINVAL);
248 }
249
250 if (mi->mi_vfsp == vfsp) { /* We found the victim */
251 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
252 return (EBUSY); /* Venus is still running */
253
254 #ifdef DEBUG
255 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
256 #endif
257 vrele(mi->mi_rootvp);
258
259 active = coda_kill(vfsp, NOT_DOWNCALL);
260 ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
261 mi->mi_rootvp->v_vflag &= ~VV_ROOT;
262 error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
263 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
264 error = 0;
265 /* I'm going to take this out to allow lookups to go through. I'm
266 * not sure it's important anyway. -- DCS 2/2/94
267 */
268 /* vfsp->VFS_DATA = NULL; */
269
270 /* No more vfsp's to hold onto */
271 mi->mi_vfsp = NULL;
272 mi->mi_rootvp = NULL;
273
274 if (error)
275 MARK_INT_FAIL(CODA_UMOUNT_STATS);
276 else
277 MARK_INT_SAT(CODA_UMOUNT_STATS);
278
279 return(error);
280 }
281 return (EINVAL);
282 }
283
284 /*
285 * find root of cfs
286 */
287 int
288 coda_root(vfsp, vpp)
289 struct mount *vfsp;
290 struct vnode **vpp;
291 {
292 struct coda_mntinfo *mi = vftomi(vfsp);
293 struct vnode **result;
294 int error;
295 struct thread *td = curthread; /* XXX - bnoble */
296 struct proc *p = td->td_proc;
297 ViceFid VFid;
298
299 ENTRY;
300 MARK_ENTRY(CODA_ROOT_STATS);
301 result = NULL;
302
303 if (vfsp == mi->mi_vfsp) {
304 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
305 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
306 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
307 { /* Found valid root. */
308 *vpp = mi->mi_rootvp;
309 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
310 #if 1
311 vref(*vpp);
312 vn_lock(*vpp, LK_EXCLUSIVE, td);
313 #else
314 vget(*vpp, LK_EXCLUSIVE, td);
315 #endif
316 MARK_INT_SAT(CODA_ROOT_STATS);
317 return(0);
318 }
319 }
320
321 error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
322
323 if (!error) {
324 /*
325 * Save the new rootfid in the cnode, and rehash the cnode into the
326 * cnode hash with the new fid key.
327 */
328 coda_unsave(VTOC(mi->mi_rootvp));
329 VTOC(mi->mi_rootvp)->c_fid = VFid;
330 coda_save(VTOC(mi->mi_rootvp));
331
332 *vpp = mi->mi_rootvp;
333 #if 1
334 vref(*vpp);
335 vn_lock(*vpp, LK_EXCLUSIVE, td);
336 #else
337 vget(*vpp, LK_EXCLUSIVE, td);
338 #endif
339
340 MARK_INT_SAT(CODA_ROOT_STATS);
341 goto exit;
342 } else if (error == ENODEV || error == EINTR) {
343 /* Gross hack here! */
344 /*
345 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
346 * ENODEV. Return the uninitialized root vnode to allow vfs
347 * operations such as unmount to continue. Without this hack,
348 * there is no way to do an unmount if Venus dies before a
349 * successful CODA_ROOT call is done. All vnode operations
350 * will fail.
351 */
352 *vpp = mi->mi_rootvp;
353 #if 1
354 vref(*vpp);
355 vn_lock(*vpp, LK_EXCLUSIVE, td);
356 #else
357 vget(*vpp, LK_EXCLUSIVE, td);
358 #endif
359
360 MARK_INT_FAIL(CODA_ROOT_STATS);
361 error = 0;
362 goto exit;
363 } else {
364 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
365 MARK_INT_FAIL(CODA_ROOT_STATS);
366
367 goto exit;
368 }
369
370 exit:
371 return(error);
372 }
373
374 /*
375 * Get filesystem statistics.
376 */
377 int
378 coda_nb_statfs(vfsp, sbp, td)
379 register struct mount *vfsp;
380 struct statfs *sbp;
381 struct thread *td;
382 {
383 ENTRY;
384 /* MARK_ENTRY(CODA_STATFS_STATS); */
385 if (!CODA_MOUNTED(vfsp)) {
386 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
387 return(EINVAL);
388 }
389
390 bzero(sbp, sizeof(struct statfs));
391 /* XXX - what to do about f_flags, others? --bnoble */
392 /* Below This is what AFS does
393 #define NB_SFS_SIZ 0x895440
394 */
395 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
396 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
397 sbp->f_bsize = 8192; /* XXX */
398 sbp->f_iosize = 8192; /* XXX */
399 #define NB_SFS_SIZ 0x8AB75D
400 sbp->f_blocks = NB_SFS_SIZ;
401 sbp->f_bfree = NB_SFS_SIZ;
402 sbp->f_bavail = NB_SFS_SIZ;
403 sbp->f_files = NB_SFS_SIZ;
404 sbp->f_ffree = NB_SFS_SIZ;
405 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
406 snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
407 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
408 /* MARK_INT_SAT(CODA_STATFS_STATS); */
409 return(0);
410 }
411
412 /*
413 * Flush any pending I/O.
414 */
415 int
416 coda_sync(vfsp, waitfor, cred, td)
417 struct mount *vfsp;
418 int waitfor;
419 struct ucred *cred;
420 struct thread *td;
421 {
422 ENTRY;
423 MARK_ENTRY(CODA_SYNC_STATS);
424 MARK_INT_SAT(CODA_SYNC_STATS);
425 return(0);
426 }
427
428 /*
429 * fhtovp is now what vget used to be in 4.3-derived systems. For
430 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
431 * a type-specific fid.
432 */
433 int
434 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
435 register struct mount *vfsp;
436 struct fid *fhp;
437 struct mbuf *nam;
438 struct vnode **vpp;
439 int *exflagsp;
440 struct ucred **creadanonp;
441 {
442 struct cfid *cfid = (struct cfid *)fhp;
443 struct cnode *cp = 0;
444 int error;
445 struct thread *td = curthread; /* XXX -mach */
446 struct proc *p = td->td_proc;
447 ViceFid VFid;
448 int vtype;
449
450 ENTRY;
451
452 MARK_ENTRY(CODA_VGET_STATS);
453 /* Check for vget of control object. */
454 if (IS_CTL_FID(&cfid->cfid_fid)) {
455 *vpp = coda_ctlvp;
456 vref(coda_ctlvp);
457 MARK_INT_SAT(CODA_VGET_STATS);
458 return(0);
459 }
460
461 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
462
463 if (error) {
464 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
465 *vpp = (struct vnode *)0;
466 } else {
467 CODADEBUG(CODA_VGET,
468 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
469 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
470
471 cp = make_coda_node(&VFid, vfsp, vtype);
472 *vpp = CTOV(cp);
473 }
474 return(error);
475 }
476
477 /*
478 * To allow for greater ease of use, some vnodes may be orphaned when
479 * Venus dies. Certain operations should still be allowed to go
480 * through, but without propagating ophan-ness. So this function will
481 * get a new vnode for the file from the current run of Venus. */
482
483 int
484 getNewVnode(vpp)
485 struct vnode **vpp;
486 {
487 struct cfid cfid;
488 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
489
490 ENTRY;
491
492 cfid.cfid_len = (short)sizeof(ViceFid);
493 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
494 /* XXX ? */
495
496 /* We're guessing that if set, the 1st element on the list is a
497 * valid vnode to use. If not, return ENODEV as venus is dead.
498 */
499 if (mi->mi_vfsp == NULL)
500 return ENODEV;
501
502 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
503 NULL, NULL);
504 }
505
506 #include <ufs/ufs/extattr.h>
507 #include <ufs/ufs/quota.h>
508 #include <ufs/ufs/ufsmount.h>
509 /* get the mount structure corresponding to a given device. Assume
510 * device corresponds to a UFS. Return NULL if no device is found.
511 */
512 struct mount *devtomp(dev)
513 dev_t dev;
514 {
515 struct mount *mp;
516
517 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
518 if (((VFSTOUFS(mp))->um_dev == dev)) {
519 /* mount corresponds to UFS and the device matches one we want */
520 return(mp);
521 }
522 }
523 /* mount structure wasn't found */
524 return(NULL);
525 }
526
527 struct vfsops coda_vfsops = {
528 coda_mount,
529 vfs_stdstart,
530 coda_unmount,
531 coda_root,
532 vfs_stdquotactl,
533 coda_nb_statfs,
534 coda_sync,
535 vfs_stdvget,
536 vfs_stdfhtovp,
537 vfs_stdcheckexp,
538 vfs_stdvptofh,
539 vfs_stdinit,
540 vfs_stduninit,
541 vfs_stdextattrctl,
542 };
543
544 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
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