Abstract out the routines which manipulate the mountlist.
[dragonfly.git] / sys / vfs / coda / coda_vfsops.c
CommitLineData
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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 $
861905fb 31 * $DragonFly: src/sys/vfs/coda/Attic/coda_vfsops.c,v 1.21 2005/04/19 17:54:44 dillon Exp $
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32 *
33 */
34
35/*
36 * Mach Operating System
37 * Copyright (c) 1989 Carnegie-Mellon University
38 * All rights reserved. The CMU software License Agreement specifies
39 * the terms and conditions for use and redistribution.
40 */
41
42/*
43 * This code was written for the Coda file system at Carnegie Mellon
44 * University. Contributers include David Steere, James Kistler, and
45 * M. Satyanarayanan.
46 */
47
1f2de5d4 48#include "use_vcoda.h"
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49
50#include <sys/param.h>
51#include <sys/systm.h>
52#include <sys/kernel.h>
53#include <sys/proc.h>
54#include <sys/malloc.h>
55#include <sys/conf.h>
fad57d0e 56#include <sys/nlookup.h>
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57#include <sys/mount.h>
58#include <sys/select.h>
59
60#include <vm/vm_zone.h>
61
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62#include "coda.h"
63#include "cnode.h"
64#include "coda_vfsops.h"
65#include "coda_venus.h"
66#include "coda_subr.h"
67#include "coda_opstats.h"
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68
69MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
70
71int codadebug = 0;
72int coda_vfsop_print_entry = 0;
5e2195bf 73#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
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74
75struct vnode *coda_ctlvp;
76struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
77
78/* structure to keep statistics of internally generated/satisfied calls */
79
80struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
81
82#define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
83#define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
84#define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
85#define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
86
87extern int coda_nc_initialized; /* Set if cache has been initialized */
a6ee311a 88extern int vc_nb_open (dev_t, int, int, d_thread_t *);
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89
90int
91coda_vfsopstats_init(void)
92{
31a0fcd9 93 int i;
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94
95 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
96 coda_vfsopstats[i].opcode = i;
97 coda_vfsopstats[i].entries = 0;
98 coda_vfsopstats[i].sat_intrn = 0;
99 coda_vfsopstats[i].unsat_intrn = 0;
100 coda_vfsopstats[i].gen_intrn = 0;
101 }
102
103 return 0;
104}
105
106/*
107 * cfs mount vfsop
108 * Set up mount info record and attach it to vfs struct.
109 */
110/*ARGSUSED*/
111int
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112coda_mount(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
115 * netbsd? */
085d998b 116 struct thread *td) /* The ever-famous proc pointer */
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117{
118 struct vnode *dvp;
119 struct cnode *cp;
e4c9c0c8 120 udev_t udev;
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121 struct coda_mntinfo *mi;
122 struct vnode *rootvp;
123 ViceFid rootfid;
124 ViceFid ctlfid;
125 int error;
fad57d0e 126 struct nlookupdata nd;
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127
128 ENTRY;
129
130 coda_vfsopstats_init();
131 coda_vnodeopstats_init();
132
133 MARK_ENTRY(CODA_MOUNT_STATS);
134 if (CODA_MOUNTED(vfsp)) {
135 MARK_INT_FAIL(CODA_MOUNT_STATS);
136 return(EBUSY);
137 }
138
139 /* Validate mount device. Similar to getmdev(). */
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140 dvp = NULL;
141 error = nlookup_init(&nd, data, UIO_USERSPACE, NLC_FOLLOW);
142 if (error == 0)
143 error = nlookup(&nd);
144 if (error == 0)
145 error = cache_vref(nd.nl_ncp, nd.nl_cred, &dvp);
146 nlookup_done(&nd);
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147 if (error) {
148 MARK_INT_FAIL(CODA_MOUNT_STATS);
149 return (error);
150 }
151 if (dvp->v_type != VCHR) {
152 MARK_INT_FAIL(CODA_MOUNT_STATS);
153 vrele(dvp);
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154 return(ENXIO);
155 }
c813f32d 156 udev = dvp->v_udev;
984263bc 157 vrele(dvp);
984263bc 158
335dda38 159#if 0 /* YYY huh? what paranoia is this? */
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160 /*
161 * See if the device table matches our expectations.
162 */
163 if (devsw(dev)->d_open != vc_nb_open)
164 {
165 MARK_INT_FAIL(CODA_MOUNT_STATS);
166 return(ENXIO);
167 }
335dda38 168#endif
984263bc 169
e4c9c0c8 170 if (uminor(udev) >= NVCODA || uminor(udev) < 0) {
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171 MARK_INT_FAIL(CODA_MOUNT_STATS);
172 return(ENXIO);
173 }
174
175 /*
176 * Initialize the mount record and link it to the vfs struct
177 */
e4c9c0c8 178 mi = &coda_mnttbl[uminor(udev)];
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179
180 if (!VC_OPEN(&mi->mi_vcomm)) {
181 MARK_INT_FAIL(CODA_MOUNT_STATS);
182 return(ENODEV);
183 }
184
185 /* No initialization (here) of mi_vcomm! */
186 vfsp->mnt_data = (qaddr_t)mi;
187 vfs_getnewfsid (vfsp);
188
189 mi->mi_vfsp = vfsp;
190
191 /*
192 * Make a root vnode to placate the Vnode interface, but don't
193 * actually make the CODA_ROOT call to venus until the first call
194 * to coda_root in case a server is down while venus is starting.
195 */
196 rootfid.Volume = 0;
197 rootfid.Vnode = 0;
198 rootfid.Unique = 0;
199 cp = make_coda_node(&rootfid, vfsp, VDIR);
200 rootvp = CTOV(cp);
201 rootvp->v_flag |= VROOT;
202
203 ctlfid.Volume = CTL_VOL;
204 ctlfid.Vnode = CTL_VNO;
205 ctlfid.Unique = CTL_UNI;
206/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
207 The above code seems to cause a loop in the cnode links.
208 I don't totally understand when it happens, it is caught
209 when closing down the system.
210 */
211 cp = make_coda_node(&ctlfid, 0, VCHR);
212
213 coda_ctlvp = CTOV(cp);
214
215 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
216 mi->mi_vfsp = vfsp;
217 mi->mi_rootvp = rootvp;
218
219 /* set filesystem block size */
220 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
221
222 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
223 For vnode_pager_haspage() references. The value should be obtained
224 from underlying UFS. */
225 /* Checked UFS. iosize is set as 8192 */
226 vfsp->mnt_stat.f_iosize = 8192;
227
228 /* error is currently guaranteed to be zero, but in case some
229 code changes... */
230 CODADEBUG(1,
231 myprintf(("coda_mount returned %d\n",error)););
232 if (error)
233 MARK_INT_FAIL(CODA_MOUNT_STATS);
234 else
235 MARK_INT_SAT(CODA_MOUNT_STATS);
236
237 return(error);
238}
239
240int
085d998b 241coda_unmount(struct mount *vfsp, int mntflags, struct thread *td)
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242{
243 struct coda_mntinfo *mi = vftomi(vfsp);
244 int active, error = 0;
245
246 ENTRY;
247 MARK_ENTRY(CODA_UMOUNT_STATS);
248 if (!CODA_MOUNTED(vfsp)) {
249 MARK_INT_FAIL(CODA_UMOUNT_STATS);
250 return(EINVAL);
251 }
252
253 if (mi->mi_vfsp == vfsp) { /* We found the victim */
254 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
255 return (EBUSY); /* Venus is still running */
256
257#ifdef DEBUG
258 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
259#endif
260 vrele(mi->mi_rootvp);
261
262 active = coda_kill(vfsp, NOT_DOWNCALL);
263 mi->mi_rootvp->v_flag &= ~VROOT;
264 error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
265 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
266 error = 0;
267 /* I'm going to take this out to allow lookups to go through. I'm
268 * not sure it's important anyway. -- DCS 2/2/94
269 */
270 /* vfsp->VFS_DATA = NULL; */
271
272 /* No more vfsp's to hold onto */
273 mi->mi_vfsp = NULL;
274 mi->mi_rootvp = NULL;
275
276 if (error)
277 MARK_INT_FAIL(CODA_UMOUNT_STATS);
278 else
279 MARK_INT_SAT(CODA_UMOUNT_STATS);
280
281 return(error);
282 }
283 return (EINVAL);
284}
285
286/*
287 * find root of cfs
288 */
289int
085d998b 290coda_root(struct mount *vfsp, struct vnode **vpp)
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291{
292 struct coda_mntinfo *mi = vftomi(vfsp);
293 struct vnode **result;
294 int error;
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295 struct thread *td = curthread; /* XXX - bnoble */
296 struct ucred *cred;
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297 ViceFid VFid;
298
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299 KKASSERT(td->td_proc);
300 cred = td->td_proc->p_ucred;
301
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302 ENTRY;
303 MARK_ENTRY(CODA_ROOT_STATS);
304 result = NULL;
305
306 if (vfsp == mi->mi_vfsp) {
307 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
308 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
309 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
310 { /* Found valid root. */
311 *vpp = mi->mi_rootvp;
312 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
5fd012e0 313 vget(*vpp, LK_EXCLUSIVE, td);
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314 MARK_INT_SAT(CODA_ROOT_STATS);
315 return(0);
316 }
317 }
318
dadab5e9 319 error = venus_root(vftomi(vfsp), cred, td, &VFid);
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320
321 if (!error) {
322 /*
323 * Save the new rootfid in the cnode, and rehash the cnode into the
324 * cnode hash with the new fid key.
325 */
326 coda_unsave(VTOC(mi->mi_rootvp));
327 VTOC(mi->mi_rootvp)->c_fid = VFid;
328 coda_save(VTOC(mi->mi_rootvp));
329
330 *vpp = mi->mi_rootvp;
5fd012e0 331 vget(*vpp, LK_EXCLUSIVE, td);
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332
333 MARK_INT_SAT(CODA_ROOT_STATS);
334 goto exit;
335 } else if (error == ENODEV || error == EINTR) {
336 /* Gross hack here! */
337 /*
338 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
339 * ENODEV. Return the uninitialized root vnode to allow vfs
340 * operations such as unmount to continue. Without this hack,
341 * there is no way to do an unmount if Venus dies before a
342 * successful CODA_ROOT call is done. All vnode operations
343 * will fail.
344 */
345 *vpp = mi->mi_rootvp;
5fd012e0 346 vget(*vpp, LK_EXCLUSIVE, td);
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347
348 MARK_INT_FAIL(CODA_ROOT_STATS);
349 error = 0;
350 goto exit;
351 } else {
352 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
353 MARK_INT_FAIL(CODA_ROOT_STATS);
354
355 goto exit;
356 }
357
358 exit:
359 return(error);
360}
361
362/*
363 * Get file system statistics.
364 */
365int
085d998b 366coda_nb_statfs(struct mount *vfsp, struct statfs *sbp, struct thread *td)
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367{
368 ENTRY;
369/* MARK_ENTRY(CODA_STATFS_STATS); */
370 if (!CODA_MOUNTED(vfsp)) {
371/* MARK_INT_FAIL(CODA_STATFS_STATS);*/
372 return(EINVAL);
373 }
374
375 bzero(sbp, sizeof(struct statfs));
376 /* XXX - what to do about f_flags, others? --bnoble */
377 /* Below This is what AFS does
378 #define NB_SFS_SIZ 0x895440
379 */
380 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
381 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
382 sbp->f_bsize = 8192; /* XXX */
383 sbp->f_iosize = 8192; /* XXX */
384#define NB_SFS_SIZ 0x8AB75D
385 sbp->f_blocks = NB_SFS_SIZ;
386 sbp->f_bfree = NB_SFS_SIZ;
387 sbp->f_bavail = NB_SFS_SIZ;
388 sbp->f_files = NB_SFS_SIZ;
389 sbp->f_ffree = NB_SFS_SIZ;
390 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
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391 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
392/* MARK_INT_SAT(CODA_STATFS_STATS); */
393 return(0);
394}
395
396/*
397 * Flush any pending I/O.
398 */
399int
085d998b 400coda_sync(struct mount *vfsp, int waitfor, struct thread *td)
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401{
402 ENTRY;
403 MARK_ENTRY(CODA_SYNC_STATS);
404 MARK_INT_SAT(CODA_SYNC_STATS);
405 return(0);
406}
407
408/*
409 * fhtovp is now what vget used to be in 4.3-derived systems. For
410 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
411 * a type-specific fid.
412 */
413int
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414coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam,
415 struct vnode **vpp, int *exflagsp, struct ucred **creadanonp)
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416{
417 struct cfid *cfid = (struct cfid *)fhp;
418 struct cnode *cp = 0;
419 int error;
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420 struct thread *td = curthread; /* XXX -mach */
421 struct ucred *cred;
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422 ViceFid VFid;
423 int vtype;
424
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425 KKASSERT(td->td_proc);
426 cred = td->td_proc->p_ucred;
427
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428 ENTRY;
429
430 MARK_ENTRY(CODA_VGET_STATS);
431 /* Check for vget of control object. */
432 if (IS_CTL_FID(&cfid->cfid_fid)) {
433 *vpp = coda_ctlvp;
434 vref(coda_ctlvp);
435 MARK_INT_SAT(CODA_VGET_STATS);
436 return(0);
437 }
438
dadab5e9 439 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, cred, td, &VFid, &vtype);
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440
441 if (error) {
442 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
443 *vpp = (struct vnode *)0;
444 } else {
445 CODADEBUG(CODA_VGET,
446 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
447 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
448
449 cp = make_coda_node(&VFid, vfsp, vtype);
450 *vpp = CTOV(cp);
451 }
452 return(error);
453}
454
455/*
456 * To allow for greater ease of use, some vnodes may be orphaned when
457 * Venus dies. Certain operations should still be allowed to go
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458 * through, but without propagating orphan-ness. So this function will
459 * get a new vnode for the file from the current run of Venus.
460 */
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461
462int
085d998b 463getNewVnode(struct vnode **vpp)
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464{
465 struct cfid cfid;
466 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
467
468 ENTRY;
469
470 cfid.cfid_len = (short)sizeof(ViceFid);
471 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
472 /* XXX ? */
473
474 /* We're guessing that if set, the 1st element on the list is a
475 * valid vnode to use. If not, return ENODEV as venus is dead.
476 */
477 if (mi->mi_vfsp == NULL)
478 return ENODEV;
479
480 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
481 NULL, NULL);
482}
483
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484#include <vfs/ufs/quota.h>
485#include <vfs/ufs/ufsmount.h>
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486
487/*
488 * get the mount structure corresponding to a given device. Assume
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489 * device corresponds to a UFS. Return NULL if no device is found.
490 */
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491struct devtomp_info {
492 struct mount *ret_mp;
493 dev_t dev;
494};
495
496static int devtomp_callback(struct mount *mp, void *data);
497
498struct mount *
499devtomp(dev_t dev)
984263bc 500{
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501 struct devtomp_info info;
502
503 info.ret_mp = NULL;
504 info.dev = dev;
505
506 mountlist_scan(devtomp_callback, &info, MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
507 return(info.ret_mp);
508}
509
510static int
511devtomp_callback(struct mount *mp, void *data)
512{
513 struct devtomp_info *info = data;
514
515 if ((VFSTOUFS(mp))->um_dev == info->dev) {
516 info->ret_mp = mp;
517 return(-1);
984263bc 518 }
861905fb 519 return(0);
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520}
521
522struct vfsops coda_vfsops = {
523 coda_mount,
524 vfs_stdstart,
525 coda_unmount,
526 coda_root,
527 vfs_stdquotactl,
528 coda_nb_statfs,
529 coda_sync,
530 vfs_stdvget,
531 vfs_stdfhtovp,
532 vfs_stdcheckexp,
533 vfs_stdvptofh,
534 vfs_stdinit,
535 vfs_stduninit,
536 vfs_stdextattrctl,
537};
538
539VFS_SET(coda_vfsops, coda, VFCF_NETWORK);