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/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
29 */
30 /*
31 * Mach Operating System
32 * Copyright (c) 1989 Carnegie-Mellon University
33 * All rights reserved. The CMU software License Agreement specifies
34 * the terms and conditions for use and redistribution.
35 */
36
37 /*
38 * This code was written for the Coda filesystem at Carnegie Mellon
39 * University. Contributers include David Steere, James Kistler, and
40 * M. Satyanarayanan.
41 */
42
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD: releng/5.2/sys/coda/coda_vfsops.c 120011 2003-09-13 01:13:56Z tjr $");
45
46 #include <vcoda.h>
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/conf.h>
51 #include <sys/kernel.h>
52 #include <sys/lock.h>
53 #include <sys/malloc.h>
54 #include <sys/mount.h>
55 #include <sys/namei.h>
56 #include <sys/proc.h>
57
58 #include <coda/coda.h>
59 #include <coda/cnode.h>
60 #include <coda/coda_vfsops.h>
61 #include <coda/coda_venus.h>
62 #include <coda/coda_subr.h>
63 #include <coda/coda_opstats.h>
64
65 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
66
67 int codadebug = 0;
68 int coda_vfsop_print_entry = 0;
69 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
70
71 struct vnode *coda_ctlvp;
72 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
73
74 /* structure to keep statistics of internally generated/satisfied calls */
75
76 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
77
78 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
79 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
80 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
81 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
82
83 extern int coda_nc_initialized; /* Set if cache has been initialized */
84 extern int vc_nb_open(dev_t, int, int, struct thread *);
85
86 int
87 coda_vfsopstats_init(void)
88 {
89 register int i;
90
91 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
92 coda_vfsopstats[i].opcode = i;
93 coda_vfsopstats[i].entries = 0;
94 coda_vfsopstats[i].sat_intrn = 0;
95 coda_vfsopstats[i].unsat_intrn = 0;
96 coda_vfsopstats[i].gen_intrn = 0;
97 }
98
99 return 0;
100 }
101
102 /*
103 * cfs mount vfsop
104 * Set up mount info record and attach it to vfs struct.
105 */
106 /*ARGSUSED*/
107 int
108 coda_mount(vfsp, path, data, ndp, td)
109 struct mount *vfsp; /* Allocated and initialized by mount(2) */
110 char *path; /* path covered: ignored by the fs-layer */
111 caddr_t data; /* Need to define a data type for this in netbsd? */
112 struct nameidata *ndp; /* Clobber this to lookup the device name */
113 struct thread *td;
114 {
115 struct vnode *dvp;
116 struct cnode *cp;
117 dev_t dev;
118 struct coda_mntinfo *mi;
119 struct vnode *rootvp;
120 CodaFid rootfid = INVAL_FID;
121 CodaFid ctlfid = CTL_FID;
122 int error;
123
124 ENTRY;
125
126 coda_vfsopstats_init();
127 coda_vnodeopstats_init();
128
129 MARK_ENTRY(CODA_MOUNT_STATS);
130 if (CODA_MOUNTED(vfsp)) {
131 MARK_INT_FAIL(CODA_MOUNT_STATS);
132 return(EBUSY);
133 }
134
135 /* Validate mount device. Similar to getmdev(). */
136 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, td);
137 error = namei(ndp);
138 dvp = ndp->ni_vp;
139
140 if (error) {
141 MARK_INT_FAIL(CODA_MOUNT_STATS);
142 return (error);
143 }
144 if (dvp->v_type != VCHR) {
145 MARK_INT_FAIL(CODA_MOUNT_STATS);
146 vrele(dvp);
147 NDFREE(ndp, NDF_ONLY_PNBUF);
148 return(ENXIO);
149 }
150 dev = dvp->v_rdev;
151 vrele(dvp);
152 NDFREE(ndp, NDF_ONLY_PNBUF);
153
154 /*
155 * See if the device table matches our expectations.
156 */
157 if (devsw(dev)->d_open != vc_nb_open)
158 {
159 MARK_INT_FAIL(CODA_MOUNT_STATS);
160 return(ENXIO);
161 }
162
163 if (minor(dev) >= NVCODA || minor(dev) < 0) {
164 MARK_INT_FAIL(CODA_MOUNT_STATS);
165 return(ENXIO);
166 }
167
168 /*
169 * Initialize the mount record and link it to the vfs struct
170 */
171 mi = &coda_mnttbl[minor(dev)];
172
173 if (!VC_OPEN(&mi->mi_vcomm)) {
174 MARK_INT_FAIL(CODA_MOUNT_STATS);
175 return(ENODEV);
176 }
177
178 /* No initialization (here) of mi_vcomm! */
179 vfsp->mnt_data = (qaddr_t)mi;
180 vfs_getnewfsid (vfsp);
181
182 mi->mi_vfsp = vfsp;
183 mi->mi_started = 0; /* XXX See coda_root() */
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 cp = make_coda_node(&rootfid, vfsp, VDIR);
191 rootvp = CTOV(cp);
192 rootvp->v_vflag |= VV_ROOT;
193
194 /* cp = make_coda_node(&ctlfid, vfsp, VCHR);
195 The above code seems to cause a loop in the cnode links.
196 I don't totally understand when it happens, it is caught
197 when closing down the system.
198 */
199 cp = make_coda_node(&ctlfid, 0, VCHR);
200
201 coda_ctlvp = CTOV(cp);
202
203 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
204 mi->mi_vfsp = vfsp;
205 mi->mi_rootvp = rootvp;
206
207 /* set filesystem block size */
208 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
209
210 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
211 For vnode_pager_haspage() references. The value should be obtained
212 from underlying UFS. */
213 /* Checked UFS. iosize is set as 8192 */
214 vfsp->mnt_stat.f_iosize = 8192;
215
216 /* error is currently guaranteed to be zero, but in case some
217 code changes... */
218 CODADEBUG(1,
219 myprintf(("coda_mount returned %d\n",error)););
220 if (error)
221 MARK_INT_FAIL(CODA_MOUNT_STATS);
222 else
223 MARK_INT_SAT(CODA_MOUNT_STATS);
224
225 return(error);
226 }
227
228 int
229 coda_unmount(vfsp, mntflags, td)
230 struct mount *vfsp;
231 int mntflags;
232 struct thread *td;
233 {
234 struct coda_mntinfo *mi = vftomi(vfsp);
235 int active, error = 0;
236
237 ENTRY;
238 MARK_ENTRY(CODA_UMOUNT_STATS);
239 if (!CODA_MOUNTED(vfsp)) {
240 MARK_INT_FAIL(CODA_UMOUNT_STATS);
241 return(EINVAL);
242 }
243
244 if (mi->mi_vfsp == vfsp) { /* We found the victim */
245 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
246 return (EBUSY); /* Venus is still running */
247
248 #ifdef DEBUG
249 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
250 #endif
251 vrele(mi->mi_rootvp);
252 active = coda_kill(vfsp, NOT_DOWNCALL);
253 ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
254 mi->mi_rootvp->v_vflag &= ~VV_ROOT;
255 error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
256 #ifdef CODA_VERBOSE
257 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
258 #endif
259 error = 0;
260 /* I'm going to take this out to allow lookups to go through. I'm
261 * not sure it's important anyway. -- DCS 2/2/94
262 */
263 /* vfsp->VFS_DATA = NULL; */
264
265 /* No more vfsp's to hold onto */
266 mi->mi_vfsp = NULL;
267 mi->mi_rootvp = NULL;
268
269 if (error)
270 MARK_INT_FAIL(CODA_UMOUNT_STATS);
271 else
272 MARK_INT_SAT(CODA_UMOUNT_STATS);
273
274 return(error);
275 }
276 return (EINVAL);
277 }
278
279 /*
280 * find root of cfs
281 */
282 int
283 coda_root(vfsp, vpp)
284 struct mount *vfsp;
285 struct vnode **vpp;
286 {
287 struct coda_mntinfo *mi = vftomi(vfsp);
288 struct vnode **result;
289 int error;
290 struct thread *td = curthread; /* XXX - bnoble */
291 struct proc *p = td->td_proc;
292 CodaFid VFid;
293 static const CodaFid invalfid = INVAL_FID;
294
295 ENTRY;
296 MARK_ENTRY(CODA_ROOT_STATS);
297 result = NULL;
298
299 if (vfsp == mi->mi_vfsp) {
300 /*
301 * Cache the root across calls. We only need to pass the request
302 * on to Venus if the root vnode is the dummy we installed in
303 * coda_mount() with all c_fid members zeroed.
304 *
305 * XXX In addition, if we are called between coda_mount() and
306 * coda_start(), we assume that the request is from vfs_mount()
307 * (before the call to checkdirs()) and return the dummy root
308 * node to avoid a deadlock. This bug is fixed in the Coda CVS
309 * repository but not in any released versions as of 6 Mar 2003.
310 */
311 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
312 sizeof(CodaFid)) != 0 || mi->mi_started == 0)
313 { /* Found valid root. */
314 *vpp = mi->mi_rootvp;
315 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
316 #if 1
317 vref(*vpp);
318 vn_lock(*vpp, LK_EXCLUSIVE, td);
319 #else
320 vget(*vpp, LK_EXCLUSIVE, td);
321 #endif
322 MARK_INT_SAT(CODA_ROOT_STATS);
323 return(0);
324 }
325 }
326
327 error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
328
329 if (!error) {
330 /*
331 * Save the new rootfid in the cnode, and rehash the cnode into the
332 * cnode hash with the new fid key.
333 */
334 coda_unsave(VTOC(mi->mi_rootvp));
335 VTOC(mi->mi_rootvp)->c_fid = VFid;
336 coda_save(VTOC(mi->mi_rootvp));
337
338 *vpp = mi->mi_rootvp;
339 #if 1
340 vref(*vpp);
341 vn_lock(*vpp, LK_EXCLUSIVE, td);
342 #else
343 vget(*vpp, LK_EXCLUSIVE, td);
344 #endif
345
346 MARK_INT_SAT(CODA_ROOT_STATS);
347 goto exit;
348 } else if (error == ENODEV || error == EINTR) {
349 /* Gross hack here! */
350 /*
351 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
352 * ENODEV. Return the uninitialized root vnode to allow vfs
353 * operations such as unmount to continue. Without this hack,
354 * there is no way to do an unmount if Venus dies before a
355 * successful CODA_ROOT call is done. All vnode operations
356 * will fail.
357 */
358 *vpp = mi->mi_rootvp;
359 #if 1
360 vref(*vpp);
361 vn_lock(*vpp, LK_EXCLUSIVE, td);
362 #else
363 vget(*vpp, LK_EXCLUSIVE, td);
364 #endif
365
366 MARK_INT_FAIL(CODA_ROOT_STATS);
367 error = 0;
368 goto exit;
369 } else {
370 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
371 MARK_INT_FAIL(CODA_ROOT_STATS);
372
373 goto exit;
374 }
375
376 exit:
377 return(error);
378 }
379
380 int
381 coda_start(mp, flags, td)
382 struct mount *mp;
383 int flags;
384 struct thread *td;
385 {
386
387 /* XXX See coda_root(). */
388 vftomi(mp)->mi_started = 1;
389 return (0);
390 }
391
392 /*
393 * Get filesystem statistics.
394 */
395 int
396 coda_nb_statfs(vfsp, sbp, td)
397 register struct mount *vfsp;
398 struct statfs *sbp;
399 struct thread *td;
400 {
401 ENTRY;
402 /* MARK_ENTRY(CODA_STATFS_STATS); */
403 if (!CODA_MOUNTED(vfsp)) {
404 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
405 return(EINVAL);
406 }
407
408 bzero(sbp, sizeof(struct statfs));
409 /* XXX - what to do about f_flags, others? --bnoble */
410 /* Below This is what AFS does
411 #define NB_SFS_SIZ 0x895440
412 */
413 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
414 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
415 sbp->f_bsize = 8192; /* XXX */
416 sbp->f_iosize = 8192; /* XXX */
417 #define NB_SFS_SIZ 0x8AB75D
418 sbp->f_blocks = NB_SFS_SIZ;
419 sbp->f_bfree = NB_SFS_SIZ;
420 sbp->f_bavail = NB_SFS_SIZ;
421 sbp->f_files = NB_SFS_SIZ;
422 sbp->f_ffree = NB_SFS_SIZ;
423 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
424 snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
425 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
426 snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
427 /* MARK_INT_SAT(CODA_STATFS_STATS); */
428 return(0);
429 }
430
431 /*
432 * Flush any pending I/O.
433 */
434 int
435 coda_sync(vfsp, waitfor, cred, td)
436 struct mount *vfsp;
437 int waitfor;
438 struct ucred *cred;
439 struct thread *td;
440 {
441 ENTRY;
442 MARK_ENTRY(CODA_SYNC_STATS);
443 MARK_INT_SAT(CODA_SYNC_STATS);
444 return(0);
445 }
446
447 /*
448 * fhtovp is now what vget used to be in 4.3-derived systems. For
449 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
450 * a type-specific fid.
451 */
452 int
453 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
454 register struct mount *vfsp;
455 struct fid *fhp;
456 struct mbuf *nam;
457 struct vnode **vpp;
458 int *exflagsp;
459 struct ucred **creadanonp;
460 {
461 struct cfid *cfid = (struct cfid *)fhp;
462 struct cnode *cp = 0;
463 int error;
464 struct thread *td = curthread; /* XXX -mach */
465 struct proc *p = td->td_proc;
466 CodaFid VFid;
467 int vtype;
468
469 ENTRY;
470
471 MARK_ENTRY(CODA_VGET_STATS);
472 /* Check for vget of control object. */
473 if (IS_CTL_FID(&cfid->cfid_fid)) {
474 *vpp = coda_ctlvp;
475 vref(coda_ctlvp);
476 MARK_INT_SAT(CODA_VGET_STATS);
477 return(0);
478 }
479
480 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
481
482 if (error) {
483 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
484 *vpp = (struct vnode *)0;
485 } else {
486 CODADEBUG(CODA_VGET,
487 myprintf(("vget: %s type %d result %d\n",
488 coda_f2s(&VFid), vtype, error)); )
489 cp = make_coda_node(&VFid, vfsp, vtype);
490 *vpp = CTOV(cp);
491 }
492 return(error);
493 }
494
495 /*
496 * To allow for greater ease of use, some vnodes may be orphaned when
497 * Venus dies. Certain operations should still be allowed to go
498 * through, but without propagating ophan-ness. So this function will
499 * get a new vnode for the file from the current run of Venus. */
500
501 int
502 getNewVnode(vpp)
503 struct vnode **vpp;
504 {
505 struct cfid cfid;
506 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
507
508 ENTRY;
509
510 cfid.cfid_len = (short)sizeof(CodaFid);
511 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
512 /* XXX ? */
513
514 /* We're guessing that if set, the 1st element on the list is a
515 * valid vnode to use. If not, return ENODEV as venus is dead.
516 */
517 if (mi->mi_vfsp == NULL)
518 return ENODEV;
519
520 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
521 NULL, NULL);
522 }
523
524 #include <ufs/ufs/extattr.h>
525 #include <ufs/ufs/quota.h>
526 #include <ufs/ufs/ufsmount.h>
527 /* get the mount structure corresponding to a given device. Assume
528 * device corresponds to a UFS. Return NULL if no device is found.
529 */
530 struct mount *devtomp(dev)
531 dev_t dev;
532 {
533 struct mount *mp;
534
535 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
536 if (((VFSTOUFS(mp))->um_dev == dev)) {
537 /* mount corresponds to UFS and the device matches one we want */
538 return(mp);
539 }
540 }
541 /* mount structure wasn't found */
542 return(NULL);
543 }
544
545 struct vfsops coda_vfsops = {
546 .vfs_mount = coda_mount,
547 .vfs_root = coda_root,
548 .vfs_start = coda_start,
549 .vfs_statfs = coda_nb_statfs,
550 .vfs_sync = coda_sync,
551 .vfs_unmount = coda_unmount,
552 };
553
554 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
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