Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / vfs / coda / coda_vfsops.c
CommitLineData
984263bc
MD
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: src/sys/coda/coda_vfsops.c,v 1.24.2.1 2001/07/26 20:36:45 iedowse Exp $
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 file system 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/kernel.h>
52#include <sys/proc.h>
53#include <sys/malloc.h>
54#include <sys/conf.h>
55#include <sys/namei.h>
56#include <sys/mount.h>
57#include <sys/select.h>
58
59#include <vm/vm_zone.h>
60
61#include <coda/coda.h>
62#include <coda/cnode.h>
63#include <coda/coda_vfsops.h>
64#include <coda/coda_venus.h>
65#include <coda/coda_subr.h>
66#include <coda/coda_opstats.h>
67
68MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
69
70int codadebug = 0;
71int coda_vfsop_print_entry = 0;
72#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
73
74struct vnode *coda_ctlvp;
75struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
76
77/* structure to keep statistics of internally generated/satisfied calls */
78
79struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
80
81#define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
82#define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
83#define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
84#define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
85
86extern int coda_nc_initialized; /* Set if cache has been initialized */
87extern int vc_nb_open __P((dev_t, int, int, struct proc *));
88
89int
90coda_vfsopstats_init(void)
91{
92 register int i;
93
94 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
95 coda_vfsopstats[i].opcode = i;
96 coda_vfsopstats[i].entries = 0;
97 coda_vfsopstats[i].sat_intrn = 0;
98 coda_vfsopstats[i].unsat_intrn = 0;
99 coda_vfsopstats[i].gen_intrn = 0;
100 }
101
102 return 0;
103}
104
105/*
106 * cfs mount vfsop
107 * Set up mount info record and attach it to vfs struct.
108 */
109/*ARGSUSED*/
110int
111coda_mount(vfsp, path, data, ndp, p)
112 struct mount *vfsp; /* Allocated and initialized by mount(2) */
113 char *path; /* path covered: ignored by the fs-layer */
114 caddr_t data; /* Need to define a data type for this in netbsd? */
115 struct nameidata *ndp; /* Clobber this to lookup the device name */
116 struct proc *p; /* The ever-famous proc pointer */
117{
118 struct vnode *dvp;
119 struct cnode *cp;
120 dev_t dev;
121 struct coda_mntinfo *mi;
122 struct vnode *rootvp;
123 ViceFid rootfid;
124 ViceFid ctlfid;
125 int error;
126
127 ENTRY;
128
129 coda_vfsopstats_init();
130 coda_vnodeopstats_init();
131
132 MARK_ENTRY(CODA_MOUNT_STATS);
133 if (CODA_MOUNTED(vfsp)) {
134 MARK_INT_FAIL(CODA_MOUNT_STATS);
135 return(EBUSY);
136 }
137
138 /* Validate mount device. Similar to getmdev(). */
139 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p);
140 error = namei(ndp);
141 dvp = ndp->ni_vp;
142
143 if (error) {
144 MARK_INT_FAIL(CODA_MOUNT_STATS);
145 return (error);
146 }
147 if (dvp->v_type != VCHR) {
148 MARK_INT_FAIL(CODA_MOUNT_STATS);
149 vrele(dvp);
150 NDFREE(ndp, NDF_ONLY_PNBUF);
151 return(ENXIO);
152 }
153 dev = dvp->v_rdev;
154 vrele(dvp);
155 NDFREE(ndp, NDF_ONLY_PNBUF);
156
157 /*
158 * See if the device table matches our expectations.
159 */
160 if (devsw(dev)->d_open != vc_nb_open)
161 {
162 MARK_INT_FAIL(CODA_MOUNT_STATS);
163 return(ENXIO);
164 }
165
166 if (minor(dev) >= NVCODA || minor(dev) < 0) {
167 MARK_INT_FAIL(CODA_MOUNT_STATS);
168 return(ENXIO);
169 }
170
171 /*
172 * Initialize the mount record and link it to the vfs struct
173 */
174 mi = &coda_mnttbl[minor(dev)];
175
176 if (!VC_OPEN(&mi->mi_vcomm)) {
177 MARK_INT_FAIL(CODA_MOUNT_STATS);
178 return(ENODEV);
179 }
180
181 /* No initialization (here) of mi_vcomm! */
182 vfsp->mnt_data = (qaddr_t)mi;
183 vfs_getnewfsid (vfsp);
184
185 mi->mi_vfsp = vfsp;
186
187 /*
188 * Make a root vnode to placate the Vnode interface, but don't
189 * actually make the CODA_ROOT call to venus until the first call
190 * to coda_root in case a server is down while venus is starting.
191 */
192 rootfid.Volume = 0;
193 rootfid.Vnode = 0;
194 rootfid.Unique = 0;
195 cp = make_coda_node(&rootfid, vfsp, VDIR);
196 rootvp = CTOV(cp);
197 rootvp->v_flag |= VROOT;
198
199 ctlfid.Volume = CTL_VOL;
200 ctlfid.Vnode = CTL_VNO;
201 ctlfid.Unique = CTL_UNI;
202/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
203 The above code seems to cause a loop in the cnode links.
204 I don't totally understand when it happens, it is caught
205 when closing down the system.
206 */
207 cp = make_coda_node(&ctlfid, 0, VCHR);
208
209 coda_ctlvp = CTOV(cp);
210
211 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
212 mi->mi_vfsp = vfsp;
213 mi->mi_rootvp = rootvp;
214
215 /* set filesystem block size */
216 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
217
218 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
219 For vnode_pager_haspage() references. The value should be obtained
220 from underlying UFS. */
221 /* Checked UFS. iosize is set as 8192 */
222 vfsp->mnt_stat.f_iosize = 8192;
223
224 /* error is currently guaranteed to be zero, but in case some
225 code changes... */
226 CODADEBUG(1,
227 myprintf(("coda_mount returned %d\n",error)););
228 if (error)
229 MARK_INT_FAIL(CODA_MOUNT_STATS);
230 else
231 MARK_INT_SAT(CODA_MOUNT_STATS);
232
233 return(error);
234}
235
236int
237coda_unmount(vfsp, mntflags, p)
238 struct mount *vfsp;
239 int mntflags;
240 struct proc *p;
241{
242 struct coda_mntinfo *mi = vftomi(vfsp);
243 int active, error = 0;
244
245 ENTRY;
246 MARK_ENTRY(CODA_UMOUNT_STATS);
247 if (!CODA_MOUNTED(vfsp)) {
248 MARK_INT_FAIL(CODA_UMOUNT_STATS);
249 return(EINVAL);
250 }
251
252 if (mi->mi_vfsp == vfsp) { /* We found the victim */
253 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
254 return (EBUSY); /* Venus is still running */
255
256#ifdef DEBUG
257 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
258#endif
259 vrele(mi->mi_rootvp);
260
261 active = coda_kill(vfsp, NOT_DOWNCALL);
262 mi->mi_rootvp->v_flag &= ~VROOT;
263 error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
264 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
265 error = 0;
266 /* I'm going to take this out to allow lookups to go through. I'm
267 * not sure it's important anyway. -- DCS 2/2/94
268 */
269 /* vfsp->VFS_DATA = NULL; */
270
271 /* No more vfsp's to hold onto */
272 mi->mi_vfsp = NULL;
273 mi->mi_rootvp = NULL;
274
275 if (error)
276 MARK_INT_FAIL(CODA_UMOUNT_STATS);
277 else
278 MARK_INT_SAT(CODA_UMOUNT_STATS);
279
280 return(error);
281 }
282 return (EINVAL);
283}
284
285/*
286 * find root of cfs
287 */
288int
289coda_root(vfsp, vpp)
290 struct mount *vfsp;
291 struct vnode **vpp;
292{
293 struct coda_mntinfo *mi = vftomi(vfsp);
294 struct vnode **result;
295 int error;
296 struct proc *p = curproc; /* XXX - bnoble */
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, p);
313#else
314 vget(*vpp, LK_EXCLUSIVE, p);
315#endif
316 MARK_INT_SAT(CODA_ROOT_STATS);
317 return(0);
318 }
319 }
320
321 error = venus_root(vftomi(vfsp), p->p_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, p);
336#else
337 vget(*vpp, LK_EXCLUSIVE, p);
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, p);
356#else
357 vget(*vpp, LK_EXCLUSIVE, p);
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 file system statistics.
376 */
377int
378coda_nb_statfs(vfsp, sbp, p)
379 register struct mount *vfsp;
380 struct statfs *sbp;
381 struct proc *p;
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 */
415int
416coda_sync(vfsp, waitfor, cred, p)
417 struct mount *vfsp;
418 int waitfor;
419 struct ucred *cred;
420 struct proc *p;
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 */
433int
434coda_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 proc *p = curproc; /* XXX -mach */
446 ViceFid VFid;
447 int vtype;
448
449 ENTRY;
450
451 MARK_ENTRY(CODA_VGET_STATS);
452 /* Check for vget of control object. */
453 if (IS_CTL_FID(&cfid->cfid_fid)) {
454 *vpp = coda_ctlvp;
455 vref(coda_ctlvp);
456 MARK_INT_SAT(CODA_VGET_STATS);
457 return(0);
458 }
459
460 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_ucred, p, &VFid, &vtype);
461
462 if (error) {
463 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
464 *vpp = (struct vnode *)0;
465 } else {
466 CODADEBUG(CODA_VGET,
467 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
468 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
469
470 cp = make_coda_node(&VFid, vfsp, vtype);
471 *vpp = CTOV(cp);
472 }
473 return(error);
474}
475
476/*
477 * To allow for greater ease of use, some vnodes may be orphaned when
478 * Venus dies. Certain operations should still be allowed to go
479 * through, but without propagating ophan-ness. So this function will
480 * get a new vnode for the file from the current run of Venus. */
481
482int
483getNewVnode(vpp)
484 struct vnode **vpp;
485{
486 struct cfid cfid;
487 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
488
489 ENTRY;
490
491 cfid.cfid_len = (short)sizeof(ViceFid);
492 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
493 /* XXX ? */
494
495 /* We're guessing that if set, the 1st element on the list is a
496 * valid vnode to use. If not, return ENODEV as venus is dead.
497 */
498 if (mi->mi_vfsp == NULL)
499 return ENODEV;
500
501 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
502 NULL, NULL);
503}
504
505#include <ufs/ufs/quota.h>
506#include <ufs/ufs/ufsmount.h>
507/* get the mount structure corresponding to a given device. Assume
508 * device corresponds to a UFS. Return NULL if no device is found.
509 */
510struct mount *devtomp(dev)
511 dev_t dev;
512{
513 struct mount *mp;
514
515 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
516 if (((VFSTOUFS(mp))->um_dev == dev)) {
517 /* mount corresponds to UFS and the device matches one we want */
518 return(mp);
519 }
520 }
521 /* mount structure wasn't found */
522 return(NULL);
523}
524
525struct vfsops coda_vfsops = {
526 coda_mount,
527 vfs_stdstart,
528 coda_unmount,
529 coda_root,
530 vfs_stdquotactl,
531 coda_nb_statfs,
532 coda_sync,
533 vfs_stdvget,
534 vfs_stdfhtovp,
535 vfs_stdcheckexp,
536 vfs_stdvptofh,
537 vfs_stdinit,
538 vfs_stduninit,
539 vfs_stdextattrctl,
540};
541
542VFS_SET(coda_vfsops, coda, VFCF_NETWORK);