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/6.2/sys/coda/coda_vfsops.c 144059 2005-03-24 07:39:03Z jeff $");
45
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/conf.h>
49 #include <sys/kernel.h>
50 #include <sys/lock.h>
51 #include <sys/malloc.h>
52 #include <sys/mount.h>
53 #include <sys/namei.h>
54 #include <sys/proc.h>
55
56 #include <coda/coda.h>
57 #include <coda/cnode.h>
58 #include <coda/coda_vfsops.h>
59 #include <coda/coda_venus.h>
60 #include <coda/coda_subr.h>
61 #include <coda/coda_opstats.h>
62
63 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
64
65 int codadebug = 0;
66 int coda_vfsop_print_entry = 0;
67 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
68
69 struct vnode *coda_ctlvp;
70
71 /* structure to keep statistics of internally generated/satisfied calls */
72
73 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
74
75 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
76 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
77 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
78 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
79
80 extern int coda_nc_initialized; /* Set if cache has been initialized */
81 extern int vc_nb_open(struct cdev *, int, int, struct thread *);
82
83 int
84 coda_vfsopstats_init(void)
85 {
86 register int i;
87
88 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
89 coda_vfsopstats[i].opcode = i;
90 coda_vfsopstats[i].entries = 0;
91 coda_vfsopstats[i].sat_intrn = 0;
92 coda_vfsopstats[i].unsat_intrn = 0;
93 coda_vfsopstats[i].gen_intrn = 0;
94 }
95
96 return 0;
97 }
98
99 static const char *coda_opts[] = { "from", NULL };
100 /*
101 * cfs mount vfsop
102 * Set up mount info record and attach it to vfs struct.
103 */
104 /*ARGSUSED*/
105 int
106 coda_mount(struct mount *vfsp, struct thread *td)
107 {
108 struct vnode *dvp;
109 struct cnode *cp;
110 struct cdev *dev;
111 struct coda_mntinfo *mi;
112 struct vnode *rootvp;
113 CodaFid rootfid = INVAL_FID;
114 CodaFid ctlfid = CTL_FID;
115 int error;
116 struct nameidata ndp;
117 ENTRY;
118 char *from;
119
120 if (vfs_filteropt(vfsp->mnt_optnew, coda_opts))
121 return (EINVAL);
122
123 from = vfs_getopts(vfsp->mnt_optnew, "from", &error);
124 if (error)
125 return (error);
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_SYSSPACE, from, 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 (dev->si_devsw->d_open != vc_nb_open)
159 {
160 MARK_INT_FAIL(CODA_MOUNT_STATS);
161 return(ENXIO);
162 }
163
164 /*
165 * Initialize the mount record and link it to the vfs struct
166 */
167 mi = dev2coda_mntinfo(dev);
168
169 if (!VC_OPEN(&mi->mi_vcomm)) {
170 MARK_INT_FAIL(CODA_MOUNT_STATS);
171 return(ENODEV);
172 }
173
174 /* No initialization (here) of mi_vcomm! */
175 vfsp->mnt_data = (qaddr_t)mi;
176 vfs_getnewfsid (vfsp);
177
178 mi->mi_vfsp = vfsp;
179 mi->mi_started = 0; /* XXX See coda_root() */
180
181 /*
182 * Make a root vnode to placate the Vnode interface, but don't
183 * actually make the CODA_ROOT call to venus until the first call
184 * to coda_root in case a server is down while venus is starting.
185 */
186 cp = make_coda_node(&rootfid, vfsp, VDIR);
187 rootvp = CTOV(cp);
188 rootvp->v_vflag |= VV_ROOT;
189
190 /* cp = make_coda_node(&ctlfid, vfsp, VCHR);
191 The above code seems to cause a loop in the cnode links.
192 I don't totally understand when it happens, it is caught
193 when closing down the system.
194 */
195 cp = make_coda_node(&ctlfid, 0, VCHR);
196
197 coda_ctlvp = CTOV(cp);
198
199 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
200 mi->mi_vfsp = vfsp;
201 mi->mi_rootvp = rootvp;
202
203 vfs_mountedfrom(vfsp, from);
204 /* error is currently guaranteed to be zero, but in case some
205 code changes... */
206 CODADEBUG(1,
207 myprintf(("coda_omount returned %d\n",error)););
208 if (error)
209 MARK_INT_FAIL(CODA_MOUNT_STATS);
210 else
211 MARK_INT_SAT(CODA_MOUNT_STATS);
212
213 return(error);
214 }
215
216 int
217 coda_unmount(vfsp, mntflags, td)
218 struct mount *vfsp;
219 int mntflags;
220 struct thread *td;
221 {
222 struct coda_mntinfo *mi = vftomi(vfsp);
223 int active, error = 0;
224
225 ENTRY;
226 MARK_ENTRY(CODA_UMOUNT_STATS);
227 if (!CODA_MOUNTED(vfsp)) {
228 MARK_INT_FAIL(CODA_UMOUNT_STATS);
229 return(EINVAL);
230 }
231
232 if (mi->mi_vfsp == vfsp) { /* We found the victim */
233 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
234 return (EBUSY); /* Venus is still running */
235
236 #ifdef DEBUG
237 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
238 #endif
239 vrele(mi->mi_rootvp);
240 active = coda_kill(vfsp, NOT_DOWNCALL);
241 ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
242 mi->mi_rootvp->v_vflag &= ~VV_ROOT;
243 error = vflush(mi->mi_vfsp, 0, FORCECLOSE, td);
244 #ifdef CODA_VERBOSE
245 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
246 #endif
247 error = 0;
248 /* I'm going to take this out to allow lookups to go through. I'm
249 * not sure it's important anyway. -- DCS 2/2/94
250 */
251 /* vfsp->VFS_DATA = NULL; */
252
253 /* No more vfsp's to hold onto */
254 mi->mi_vfsp = NULL;
255 mi->mi_rootvp = NULL;
256
257 if (error)
258 MARK_INT_FAIL(CODA_UMOUNT_STATS);
259 else
260 MARK_INT_SAT(CODA_UMOUNT_STATS);
261
262 return(error);
263 }
264 return (EINVAL);
265 }
266
267 /*
268 * find root of cfs
269 */
270 int
271 coda_root(vfsp, flags, vpp, td)
272 struct mount *vfsp;
273 int flags;
274 struct vnode **vpp;
275 struct thread *td;
276 {
277 struct coda_mntinfo *mi = vftomi(vfsp);
278 struct vnode **result;
279 int error;
280 struct proc *p = td->td_proc;
281 CodaFid VFid;
282 static const CodaFid invalfid = INVAL_FID;
283
284 ENTRY;
285 MARK_ENTRY(CODA_ROOT_STATS);
286 result = NULL;
287
288 if (vfsp == mi->mi_vfsp) {
289 /*
290 * Cache the root across calls. We only need to pass the request
291 * on to Venus if the root vnode is the dummy we installed in
292 * coda_omount() with all c_fid members zeroed.
293 *
294 * XXX In addition, we assume that the first call to coda_root()
295 * is from vfs_omount()
296 * (before the call to checkdirs()) and return the dummy root
297 * node to avoid a deadlock. This bug is fixed in the Coda CVS
298 * repository but not in any released versions as of 6 Mar 2003.
299 */
300 if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
301 sizeof(CodaFid)) != 0 || mi->mi_started == 0)
302 { /* Found valid root. */
303 *vpp = mi->mi_rootvp;
304 mi->mi_started = 1;
305
306 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
307 #if 1
308 vref(*vpp);
309 vn_lock(*vpp, LK_EXCLUSIVE, td);
310 #else
311 vget(*vpp, LK_EXCLUSIVE, td);
312 #endif
313 MARK_INT_SAT(CODA_ROOT_STATS);
314 return(0);
315 }
316 }
317
318 error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
319
320 if (!error) {
321 /*
322 * Save the new rootfid in the cnode, and rehash the cnode into the
323 * cnode hash with the new fid key.
324 */
325 coda_unsave(VTOC(mi->mi_rootvp));
326 VTOC(mi->mi_rootvp)->c_fid = VFid;
327 coda_save(VTOC(mi->mi_rootvp));
328
329 *vpp = mi->mi_rootvp;
330 #if 1
331 vref(*vpp);
332 vn_lock(*vpp, LK_EXCLUSIVE, td);
333 #else
334 vget(*vpp, LK_EXCLUSIVE, td);
335 #endif
336
337 MARK_INT_SAT(CODA_ROOT_STATS);
338 goto exit;
339 } else if (error == ENODEV || error == EINTR) {
340 /* Gross hack here! */
341 /*
342 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
343 * ENODEV. Return the uninitialized root vnode to allow vfs
344 * operations such as unmount to continue. Without this hack,
345 * there is no way to do an unmount if Venus dies before a
346 * successful CODA_ROOT call is done. All vnode operations
347 * will fail.
348 */
349 *vpp = mi->mi_rootvp;
350 #if 1
351 vref(*vpp);
352 vn_lock(*vpp, LK_EXCLUSIVE, td);
353 #else
354 vget(*vpp, LK_EXCLUSIVE, td);
355 #endif
356
357 MARK_INT_FAIL(CODA_ROOT_STATS);
358 error = 0;
359 goto exit;
360 } else {
361 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
362 MARK_INT_FAIL(CODA_ROOT_STATS);
363
364 goto exit;
365 }
366
367 exit:
368 return(error);
369 }
370
371 /*
372 * Get filesystem statistics.
373 */
374 int
375 coda_nb_statfs(vfsp, sbp, td)
376 register struct mount *vfsp;
377 struct statfs *sbp;
378 struct thread *td;
379 {
380 ENTRY;
381 /* MARK_ENTRY(CODA_STATFS_STATS); */
382 if (!CODA_MOUNTED(vfsp)) {
383 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
384 return(EINVAL);
385 }
386
387 bzero(sbp, sizeof(struct statfs));
388 /* XXX - what to do about f_flags, others? --bnoble */
389 /* Below This is what AFS does
390 #define NB_SFS_SIZ 0x895440
391 */
392 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
393 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
394 sbp->f_bsize = 8192; /* XXX */
395 sbp->f_iosize = 8192; /* XXX */
396 #define NB_SFS_SIZ 0x8AB75D
397 sbp->f_blocks = NB_SFS_SIZ;
398 sbp->f_bfree = NB_SFS_SIZ;
399 sbp->f_bavail = NB_SFS_SIZ;
400 sbp->f_files = NB_SFS_SIZ;
401 sbp->f_ffree = NB_SFS_SIZ;
402 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
403 snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
404 snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
405 /* MARK_INT_SAT(CODA_STATFS_STATS); */
406 return(0);
407 }
408
409 /*
410 * Flush any pending I/O.
411 */
412 int
413 coda_sync(vfsp, waitfor, td)
414 struct mount *vfsp;
415 int waitfor;
416 struct thread *td;
417 {
418 ENTRY;
419 MARK_ENTRY(CODA_SYNC_STATS);
420 MARK_INT_SAT(CODA_SYNC_STATS);
421 return(0);
422 }
423
424 /*
425 * fhtovp is now what vget used to be in 4.3-derived systems. For
426 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
427 * a type-specific fid.
428 */
429 int
430 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
431 register struct mount *vfsp;
432 struct fid *fhp;
433 struct mbuf *nam;
434 struct vnode **vpp;
435 int *exflagsp;
436 struct ucred **creadanonp;
437 {
438 struct cfid *cfid = (struct cfid *)fhp;
439 struct cnode *cp = 0;
440 int error;
441 struct thread *td = curthread; /* XXX -mach */
442 struct proc *p = td->td_proc;
443 CodaFid VFid;
444 int vtype;
445
446 ENTRY;
447
448 MARK_ENTRY(CODA_VGET_STATS);
449 /* Check for vget of control object. */
450 if (IS_CTL_FID(&cfid->cfid_fid)) {
451 *vpp = coda_ctlvp;
452 vref(coda_ctlvp);
453 MARK_INT_SAT(CODA_VGET_STATS);
454 return(0);
455 }
456
457 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
458
459 if (error) {
460 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
461 *vpp = (struct vnode *)0;
462 } else {
463 CODADEBUG(CODA_VGET,
464 myprintf(("vget: %s type %d result %d\n",
465 coda_f2s(&VFid), vtype, error)); )
466 cp = make_coda_node(&VFid, vfsp, vtype);
467 *vpp = CTOV(cp);
468 }
469 return(error);
470 }
471
472 /*
473 * To allow for greater ease of use, some vnodes may be orphaned when
474 * Venus dies. Certain operations should still be allowed to go
475 * through, but without propagating ophan-ness. So this function will
476 * get a new vnode for the file from the current run of Venus. */
477
478 int
479 getNewVnode(vpp)
480 struct vnode **vpp;
481 {
482 struct cfid cfid;
483 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
484
485 ENTRY;
486
487 cfid.cfid_len = (short)sizeof(CodaFid);
488 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
489 /* XXX ? */
490
491 /* We're guessing that if set, the 1st element on the list is a
492 * valid vnode to use. If not, return ENODEV as venus is dead.
493 */
494 if (mi->mi_vfsp == NULL)
495 return ENODEV;
496
497 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
498 NULL, NULL);
499 }
500
501 #include <ufs/ufs/extattr.h>
502 #include <ufs/ufs/quota.h>
503 #include <ufs/ufs/ufsmount.h>
504 /* get the mount structure corresponding to a given device. Assume
505 * device corresponds to a UFS. Return NULL if no device is found.
506 */
507 struct mount *devtomp(dev)
508 struct cdev *dev;
509 {
510 struct mount *mp;
511
512 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
513 if (((VFSTOUFS(mp))->um_dev == dev)) {
514 /* mount corresponds to UFS and the device matches one we want */
515 return(mp);
516 }
517 }
518 /* mount structure wasn't found */
519 return(NULL);
520 }
521
522 struct vfsops coda_vfsops = {
523 .vfs_mount = coda_mount,
524 .vfs_root = coda_root,
525 .vfs_statfs = coda_nb_statfs,
526 .vfs_sync = coda_sync,
527 .vfs_unmount = coda_unmount,
528 };
529
530 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
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