Device layer rollup commit.
[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 $
e4c9c0c8 31 * $DragonFly: src/sys/vfs/coda/Attic/coda_vfsops.c,v 1.14 2004/05/19 22:53:04 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>
56#include <sys/namei.h>
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;
73#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
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? */
116 struct nameidata *ndp, /* Clobber this to lookup the device name */
117 struct thread *td) /* The ever-famous proc pointer */
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118{
119 struct vnode *dvp;
120 struct cnode *cp;
e4c9c0c8 121 udev_t udev;
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122 struct coda_mntinfo *mi;
123 struct vnode *rootvp;
124 ViceFid rootfid;
125 ViceFid ctlfid;
126 int error;
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(). */
2b69e610 140 NDINIT(ndp, NAMEI_LOOKUP, CNP_FOLLOW, UIO_USERSPACE, data, td);
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141 error = namei(ndp);
142 dvp = ndp->ni_vp;
143
144 if (error) {
145 MARK_INT_FAIL(CODA_MOUNT_STATS);
146 return (error);
147 }
148 if (dvp->v_type != VCHR) {
149 MARK_INT_FAIL(CODA_MOUNT_STATS);
150 vrele(dvp);
151 NDFREE(ndp, NDF_ONLY_PNBUF);
152 return(ENXIO);
153 }
e4c9c0c8 154 udev = dvp->v_rdev;
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155 vrele(dvp);
156 NDFREE(ndp, NDF_ONLY_PNBUF);
157
335dda38 158#if 0 /* YYY huh? what paranoia is this? */
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159 /*
160 * See if the device table matches our expectations.
161 */
162 if (devsw(dev)->d_open != vc_nb_open)
163 {
164 MARK_INT_FAIL(CODA_MOUNT_STATS);
165 return(ENXIO);
166 }
335dda38 167#endif
984263bc 168
e4c9c0c8 169 if (uminor(udev) >= NVCODA || uminor(udev) < 0) {
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170 MARK_INT_FAIL(CODA_MOUNT_STATS);
171 return(ENXIO);
172 }
173
174 /*
175 * Initialize the mount record and link it to the vfs struct
176 */
e4c9c0c8 177 mi = &coda_mnttbl[uminor(udev)];
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178
179 if (!VC_OPEN(&mi->mi_vcomm)) {
180 MARK_INT_FAIL(CODA_MOUNT_STATS);
181 return(ENODEV);
182 }
183
184 /* No initialization (here) of mi_vcomm! */
185 vfsp->mnt_data = (qaddr_t)mi;
186 vfs_getnewfsid (vfsp);
187
188 mi->mi_vfsp = vfsp;
189
190 /*
191 * Make a root vnode to placate the Vnode interface, but don't
192 * actually make the CODA_ROOT call to venus until the first call
193 * to coda_root in case a server is down while venus is starting.
194 */
195 rootfid.Volume = 0;
196 rootfid.Vnode = 0;
197 rootfid.Unique = 0;
198 cp = make_coda_node(&rootfid, vfsp, VDIR);
199 rootvp = CTOV(cp);
200 rootvp->v_flag |= VROOT;
201
202 ctlfid.Volume = CTL_VOL;
203 ctlfid.Vnode = CTL_VNO;
204 ctlfid.Unique = CTL_UNI;
205/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
206 The above code seems to cause a loop in the cnode links.
207 I don't totally understand when it happens, it is caught
208 when closing down the system.
209 */
210 cp = make_coda_node(&ctlfid, 0, VCHR);
211
212 coda_ctlvp = CTOV(cp);
213
214 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
215 mi->mi_vfsp = vfsp;
216 mi->mi_rootvp = rootvp;
217
218 /* set filesystem block size */
219 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
220
221 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
222 For vnode_pager_haspage() references. The value should be obtained
223 from underlying UFS. */
224 /* Checked UFS. iosize is set as 8192 */
225 vfsp->mnt_stat.f_iosize = 8192;
226
227 /* error is currently guaranteed to be zero, but in case some
228 code changes... */
229 CODADEBUG(1,
230 myprintf(("coda_mount returned %d\n",error)););
231 if (error)
232 MARK_INT_FAIL(CODA_MOUNT_STATS);
233 else
234 MARK_INT_SAT(CODA_MOUNT_STATS);
235
236 return(error);
237}
238
239int
085d998b 240coda_unmount(struct mount *vfsp, int mntflags, struct thread *td)
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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
085d998b 289coda_root(struct mount *vfsp, struct vnode **vpp)
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290{
291 struct coda_mntinfo *mi = vftomi(vfsp);
292 struct vnode **result;
293 int error;
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294 struct thread *td = curthread; /* XXX - bnoble */
295 struct ucred *cred;
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296 ViceFid VFid;
297
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298 KKASSERT(td->td_proc);
299 cred = td->td_proc->p_ucred;
300
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301 ENTRY;
302 MARK_ENTRY(CODA_ROOT_STATS);
303 result = NULL;
304
305 if (vfsp == mi->mi_vfsp) {
306 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
307 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
308 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
309 { /* Found valid root. */
310 *vpp = mi->mi_rootvp;
311 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
41a01a4d 312#if 1
984263bc 313 vref(*vpp);
41a01a4d 314 vn_lock(*vpp, NULL, LK_EXCLUSIVE, td);
984263bc 315#else
41a01a4d 316 vget(*vpp, NULL, LK_EXCLUSIVE, td);
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317#endif
318 MARK_INT_SAT(CODA_ROOT_STATS);
319 return(0);
320 }
321 }
322
dadab5e9 323 error = venus_root(vftomi(vfsp), cred, td, &VFid);
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324
325 if (!error) {
326 /*
327 * Save the new rootfid in the cnode, and rehash the cnode into the
328 * cnode hash with the new fid key.
329 */
330 coda_unsave(VTOC(mi->mi_rootvp));
331 VTOC(mi->mi_rootvp)->c_fid = VFid;
332 coda_save(VTOC(mi->mi_rootvp));
333
334 *vpp = mi->mi_rootvp;
335#if 1
336 vref(*vpp);
41a01a4d 337 vn_lock(*vpp, NULL, LK_EXCLUSIVE, td);
984263bc 338#else
41a01a4d 339 vget(*vpp, NULL, LK_EXCLUSIVE, td);
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340#endif
341
342 MARK_INT_SAT(CODA_ROOT_STATS);
343 goto exit;
344 } else if (error == ENODEV || error == EINTR) {
345 /* Gross hack here! */
346 /*
347 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
348 * ENODEV. Return the uninitialized root vnode to allow vfs
349 * operations such as unmount to continue. Without this hack,
350 * there is no way to do an unmount if Venus dies before a
351 * successful CODA_ROOT call is done. All vnode operations
352 * will fail.
353 */
354 *vpp = mi->mi_rootvp;
355#if 1
356 vref(*vpp);
41a01a4d 357 vn_lock(*vpp, NULL, LK_EXCLUSIVE, td);
984263bc 358#else
41a01a4d 359 vget(*vpp, NULL, LK_EXCLUSIVE, td);
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360#endif
361
362 MARK_INT_FAIL(CODA_ROOT_STATS);
363 error = 0;
364 goto exit;
365 } else {
366 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
367 MARK_INT_FAIL(CODA_ROOT_STATS);
368
369 goto exit;
370 }
371
372 exit:
373 return(error);
374}
375
376/*
377 * Get file system statistics.
378 */
379int
085d998b 380coda_nb_statfs(struct mount *vfsp, struct statfs *sbp, struct thread *td)
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381{
382 ENTRY;
383/* MARK_ENTRY(CODA_STATFS_STATS); */
384 if (!CODA_MOUNTED(vfsp)) {
385/* MARK_INT_FAIL(CODA_STATFS_STATS);*/
386 return(EINVAL);
387 }
388
389 bzero(sbp, sizeof(struct statfs));
390 /* XXX - what to do about f_flags, others? --bnoble */
391 /* Below This is what AFS does
392 #define NB_SFS_SIZ 0x895440
393 */
394 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
395 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
396 sbp->f_bsize = 8192; /* XXX */
397 sbp->f_iosize = 8192; /* XXX */
398#define NB_SFS_SIZ 0x8AB75D
399 sbp->f_blocks = NB_SFS_SIZ;
400 sbp->f_bfree = NB_SFS_SIZ;
401 sbp->f_bavail = NB_SFS_SIZ;
402 sbp->f_files = NB_SFS_SIZ;
403 sbp->f_ffree = NB_SFS_SIZ;
404 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
405 snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
406 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
407/* MARK_INT_SAT(CODA_STATFS_STATS); */
408 return(0);
409}
410
411/*
412 * Flush any pending I/O.
413 */
414int
085d998b 415coda_sync(struct mount *vfsp, int waitfor, struct thread *td)
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416{
417 ENTRY;
418 MARK_ENTRY(CODA_SYNC_STATS);
419 MARK_INT_SAT(CODA_SYNC_STATS);
420 return(0);
421}
422
423/*
424 * fhtovp is now what vget used to be in 4.3-derived systems. For
425 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
426 * a type-specific fid.
427 */
428int
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429coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam,
430 struct vnode **vpp, int *exflagsp, struct ucred **creadanonp)
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431{
432 struct cfid *cfid = (struct cfid *)fhp;
433 struct cnode *cp = 0;
434 int error;
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435 struct thread *td = curthread; /* XXX -mach */
436 struct ucred *cred;
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437 ViceFid VFid;
438 int vtype;
439
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440 KKASSERT(td->td_proc);
441 cred = td->td_proc->p_ucred;
442
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443 ENTRY;
444
445 MARK_ENTRY(CODA_VGET_STATS);
446 /* Check for vget of control object. */
447 if (IS_CTL_FID(&cfid->cfid_fid)) {
448 *vpp = coda_ctlvp;
449 vref(coda_ctlvp);
450 MARK_INT_SAT(CODA_VGET_STATS);
451 return(0);
452 }
453
dadab5e9 454 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, cred, td, &VFid, &vtype);
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455
456 if (error) {
457 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
458 *vpp = (struct vnode *)0;
459 } else {
460 CODADEBUG(CODA_VGET,
461 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
462 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
463
464 cp = make_coda_node(&VFid, vfsp, vtype);
465 *vpp = CTOV(cp);
466 }
467 return(error);
468}
469
470/*
471 * To allow for greater ease of use, some vnodes may be orphaned when
472 * Venus dies. Certain operations should still be allowed to go
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473 * through, but without propagating orphan-ness. So this function will
474 * get a new vnode for the file from the current run of Venus.
475 */
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476
477int
085d998b 478getNewVnode(struct vnode **vpp)
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479{
480 struct cfid cfid;
481 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
482
483 ENTRY;
484
485 cfid.cfid_len = (short)sizeof(ViceFid);
486 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
487 /* XXX ? */
488
489 /* We're guessing that if set, the 1st element on the list is a
490 * valid vnode to use. If not, return ENODEV as venus is dead.
491 */
492 if (mi->mi_vfsp == NULL)
493 return ENODEV;
494
495 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
496 NULL, NULL);
497}
498
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499#include <vfs/ufs/quota.h>
500#include <vfs/ufs/ufsmount.h>
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501/* get the mount structure corresponding to a given device. Assume
502 * device corresponds to a UFS. Return NULL if no device is found.
503 */
085d998b 504struct mount *devtomp(dev_t dev)
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505{
506 struct mount *mp;
507
508 TAILQ_FOREACH(mp, &mountlist, mnt_list) {
509 if (((VFSTOUFS(mp))->um_dev == dev)) {
510 /* mount corresponds to UFS and the device matches one we want */
511 return(mp);
512 }
513 }
514 /* mount structure wasn't found */
515 return(NULL);
516}
517
518struct vfsops coda_vfsops = {
519 coda_mount,
520 vfs_stdstart,
521 coda_unmount,
522 coda_root,
523 vfs_stdquotactl,
524 coda_nb_statfs,
525 coda_sync,
526 vfs_stdvget,
527 vfs_stdfhtovp,
528 vfs_stdcheckexp,
529 vfs_stdvptofh,
530 vfs_stdinit,
531 vfs_stduninit,
532 vfs_stdextattrctl,
533};
534
535VFS_SET(coda_vfsops, coda, VFCF_NETWORK);