coda_vfsops.c revision 132902 
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: head/sys/fs/coda/coda_vfsops.c 132902 2004-07-30 22:08:52Z phk $");
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
65MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
66
67int codadebug = 0;
68int coda_vfsop_print_entry = 0;
69#define ENTRY    if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
70
71struct vnode *coda_ctlvp;
72struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
73
74/* structure to keep statistics of internally generated/satisfied calls */
75
76struct 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
83extern int coda_nc_initialized;     /* Set if cache has been initialized */
84extern int vc_nb_open(struct cdev *, int, int, struct thread *);
85
86static vfs_omount_t coda_omount;
87
88int
89coda_vfsopstats_init(void)
90{
91	register int i;
92
93	for (i=0;i<CODA_VFSOPS_SIZE;i++) {
94		coda_vfsopstats[i].opcode = i;
95		coda_vfsopstats[i].entries = 0;
96		coda_vfsopstats[i].sat_intrn = 0;
97		coda_vfsopstats[i].unsat_intrn = 0;
98		coda_vfsopstats[i].gen_intrn = 0;
99	}
100
101	return 0;
102}
103
104/*
105 * cfs mount vfsop
106 * Set up mount info record and attach it to vfs struct.
107 */
108/*ARGSUSED*/
109int
110coda_omount(vfsp, path, data, td)
111    struct mount *vfsp;		/* Allocated and initialized by mount(2) */
112    char *path;			/* path covered: ignored by the fs-layer */
113    caddr_t data;		/* Need to define a data type for this in netbsd? */
114    struct thread *td;
115{
116    struct vnode *dvp;
117    struct cnode *cp;
118    struct cdev *dev;
119    struct coda_mntinfo *mi;
120    struct vnode *rootvp;
121    CodaFid rootfid = INVAL_FID;
122    CodaFid ctlfid = CTL_FID;
123    int error;
124    struct nameidata ndp;
125    ENTRY;
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_USERSPACE, data, 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 (devsw(dev)->d_open != vc_nb_open)
159    {
160	MARK_INT_FAIL(CODA_MOUNT_STATS);
161	return(ENXIO);
162    }
163
164    if (minor(dev) >= NVCODA || minor(dev) < 0) {
165	MARK_INT_FAIL(CODA_MOUNT_STATS);
166	return(ENXIO);
167    }
168
169    /*
170     * Initialize the mount record and link it to the vfs struct
171     */
172    mi = &coda_mnttbl[minor(dev)];
173
174    if (!VC_OPEN(&mi->mi_vcomm)) {
175	MARK_INT_FAIL(CODA_MOUNT_STATS);
176	return(ENODEV);
177    }
178
179    /* No initialization (here) of mi_vcomm! */
180    vfsp->mnt_data = (qaddr_t)mi;
181    vfs_getnewfsid (vfsp);
182
183    mi->mi_vfsp = vfsp;
184    mi->mi_started = 0;			/* XXX See coda_root() */
185
186    /*
187     * Make a root vnode to placate the Vnode interface, but don't
188     * actually make the CODA_ROOT call to venus until the first call
189     * to coda_root in case a server is down while venus is starting.
190     */
191    cp = make_coda_node(&rootfid, vfsp, VDIR);
192    rootvp = CTOV(cp);
193    rootvp->v_vflag |= VV_ROOT;
194
195/*  cp = make_coda_node(&ctlfid, vfsp, VCHR);
196    The above code seems to cause a loop in the cnode links.
197    I don't totally understand when it happens, it is caught
198    when closing down the system.
199 */
200    cp = make_coda_node(&ctlfid, 0, VCHR);
201
202    coda_ctlvp = CTOV(cp);
203
204    /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
205    mi->mi_vfsp = vfsp;
206    mi->mi_rootvp = rootvp;
207
208    /* set filesystem block size */
209    vfsp->mnt_stat.f_bsize = 8192;	    /* XXX -JJK */
210
211    /* Set f_iosize.  XXX -- inamura@isl.ntt.co.jp.
212       For vnode_pager_haspage() references. The value should be obtained
213       from underlying UFS. */
214    /* Checked UFS. iosize is set as 8192 */
215    vfsp->mnt_stat.f_iosize = 8192;
216
217    /* error is currently guaranteed to be zero, but in case some
218       code changes... */
219    CODADEBUG(1,
220	     myprintf(("coda_omount returned %d\n",error)););
221    if (error)
222	MARK_INT_FAIL(CODA_MOUNT_STATS);
223    else
224	MARK_INT_SAT(CODA_MOUNT_STATS);
225
226    return(error);
227}
228
229int
230coda_unmount(vfsp, mntflags, td)
231    struct mount *vfsp;
232    int mntflags;
233    struct thread *td;
234{
235    struct coda_mntinfo *mi = vftomi(vfsp);
236    int active, error = 0;
237
238    ENTRY;
239    MARK_ENTRY(CODA_UMOUNT_STATS);
240    if (!CODA_MOUNTED(vfsp)) {
241	MARK_INT_FAIL(CODA_UMOUNT_STATS);
242	return(EINVAL);
243    }
244
245    if (mi->mi_vfsp == vfsp) {	/* We found the victim */
246	if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
247	    return (EBUSY); 	/* Venus is still running */
248
249#ifdef	DEBUG
250	printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
251#endif
252	vrele(mi->mi_rootvp);
253	active = coda_kill(vfsp, NOT_DOWNCALL);
254	ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
255	mi->mi_rootvp->v_vflag &= ~VV_ROOT;
256	error = vflush(mi->mi_vfsp, 0, FORCECLOSE, td);
257#ifdef CODA_VERBOSE
258	printf("coda_unmount: active = %d, vflush active %d\n", active, error);
259#endif
260	error = 0;
261	/* I'm going to take this out to allow lookups to go through. I'm
262	 * not sure it's important anyway. -- DCS 2/2/94
263	 */
264	/* vfsp->VFS_DATA = NULL; */
265
266	/* No more vfsp's to hold onto */
267	mi->mi_vfsp = NULL;
268	mi->mi_rootvp = NULL;
269
270	if (error)
271	    MARK_INT_FAIL(CODA_UMOUNT_STATS);
272	else
273	    MARK_INT_SAT(CODA_UMOUNT_STATS);
274
275	return(error);
276    }
277    return (EINVAL);
278}
279
280/*
281 * find root of cfs
282 */
283int
284coda_root(vfsp, vpp, td)
285	struct mount *vfsp;
286	struct vnode **vpp;
287	struct thread *td;
288{
289    struct coda_mntinfo *mi = vftomi(vfsp);
290    struct vnode **result;
291    int error;
292    struct proc *p = td->td_proc;
293    CodaFid VFid;
294    static const CodaFid invalfid = INVAL_FID;
295
296    ENTRY;
297    MARK_ENTRY(CODA_ROOT_STATS);
298    result = NULL;
299
300    if (vfsp == mi->mi_vfsp) {
301	/*
302	 * Cache the root across calls. We only need to pass the request
303	 * on to Venus if the root vnode is the dummy we installed in
304	 * coda_omount() with all c_fid members zeroed.
305	 *
306	 * XXX In addition, if we are called between coda_omount() and
307	 * coda_start(), we assume that the request is from vfs_omount()
308	 * (before the call to checkdirs()) and return the dummy root
309	 * node to avoid a deadlock. This bug is fixed in the Coda CVS
310	 * repository but not in any released versions as of 6 Mar 2003.
311	 */
312	if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
313	    sizeof(CodaFid)) != 0 || mi->mi_started == 0)
314	    { /* Found valid root. */
315		*vpp = mi->mi_rootvp;
316		/* On Mach, this is vref.  On NetBSD, VOP_LOCK */
317#if	1
318		vref(*vpp);
319		vn_lock(*vpp, LK_EXCLUSIVE, td);
320#else
321		vget(*vpp, LK_EXCLUSIVE, td);
322#endif
323		MARK_INT_SAT(CODA_ROOT_STATS);
324		return(0);
325	    }
326    }
327
328    error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
329
330    if (!error) {
331	/*
332	 * Save the new rootfid in the cnode, and rehash the cnode into the
333	 * cnode hash with the new fid key.
334	 */
335	coda_unsave(VTOC(mi->mi_rootvp));
336	VTOC(mi->mi_rootvp)->c_fid = VFid;
337	coda_save(VTOC(mi->mi_rootvp));
338
339	*vpp = mi->mi_rootvp;
340#if	1
341	vref(*vpp);
342	vn_lock(*vpp, LK_EXCLUSIVE, td);
343#else
344	vget(*vpp, LK_EXCLUSIVE, td);
345#endif
346
347	MARK_INT_SAT(CODA_ROOT_STATS);
348	goto exit;
349    } else if (error == ENODEV || error == EINTR) {
350	/* Gross hack here! */
351	/*
352	 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
353	 * ENODEV. Return the uninitialized root vnode to allow vfs
354	 * operations such as unmount to continue. Without this hack,
355	 * there is no way to do an unmount if Venus dies before a
356	 * successful CODA_ROOT call is done. All vnode operations
357	 * will fail.
358	 */
359	*vpp = mi->mi_rootvp;
360#if	1
361	vref(*vpp);
362	vn_lock(*vpp, LK_EXCLUSIVE, td);
363#else
364	vget(*vpp, LK_EXCLUSIVE, td);
365#endif
366
367	MARK_INT_FAIL(CODA_ROOT_STATS);
368	error = 0;
369	goto exit;
370    } else {
371	CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
372	MARK_INT_FAIL(CODA_ROOT_STATS);
373
374	goto exit;
375    }
376
377 exit:
378    return(error);
379}
380
381int
382coda_start(mp, flags, td)
383	struct mount *mp;
384	int flags;
385	struct thread *td;
386{
387
388	/* XXX See coda_root(). */
389	vftomi(mp)->mi_started = 1;
390	return (0);
391}
392
393/*
394 * Get filesystem statistics.
395 */
396int
397coda_nb_statfs(vfsp, sbp, td)
398    register struct mount *vfsp;
399    struct statfs *sbp;
400    struct thread *td;
401{
402    ENTRY;
403/*  MARK_ENTRY(CODA_STATFS_STATS); */
404    if (!CODA_MOUNTED(vfsp)) {
405/*	MARK_INT_FAIL(CODA_STATFS_STATS);*/
406	return(EINVAL);
407    }
408
409    bzero(sbp, sizeof(struct statfs));
410    /* XXX - what to do about f_flags, others? --bnoble */
411    /* Below This is what AFS does
412    	#define NB_SFS_SIZ 0x895440
413     */
414    /* Note: Normal fs's have a bsize of 0x400 == 1024 */
415    sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
416    sbp->f_bsize = 8192; /* XXX */
417    sbp->f_iosize = 8192; /* XXX */
418#define NB_SFS_SIZ 0x8AB75D
419    sbp->f_blocks = NB_SFS_SIZ;
420    sbp->f_bfree = NB_SFS_SIZ;
421    sbp->f_bavail = NB_SFS_SIZ;
422    sbp->f_files = NB_SFS_SIZ;
423    sbp->f_ffree = NB_SFS_SIZ;
424    bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
425    snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
426    snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
427    snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
428/*  MARK_INT_SAT(CODA_STATFS_STATS); */
429    return(0);
430}
431
432/*
433 * Flush any pending I/O.
434 */
435int
436coda_sync(vfsp, waitfor, cred, td)
437    struct mount *vfsp;
438    int    waitfor;
439    struct ucred *cred;
440    struct thread *td;
441{
442    ENTRY;
443    MARK_ENTRY(CODA_SYNC_STATS);
444    MARK_INT_SAT(CODA_SYNC_STATS);
445    return(0);
446}
447
448/*
449 * fhtovp is now what vget used to be in 4.3-derived systems.  For
450 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
451 * a type-specific fid.
452 */
453int
454coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
455    register struct mount *vfsp;
456    struct fid *fhp;
457    struct mbuf *nam;
458    struct vnode **vpp;
459    int *exflagsp;
460    struct ucred **creadanonp;
461{
462    struct cfid *cfid = (struct cfid *)fhp;
463    struct cnode *cp = 0;
464    int error;
465    struct thread *td = curthread; /* XXX -mach */
466    struct proc *p = td->td_proc;
467    CodaFid VFid;
468    int vtype;
469
470    ENTRY;
471
472    MARK_ENTRY(CODA_VGET_STATS);
473    /* Check for vget of control object. */
474    if (IS_CTL_FID(&cfid->cfid_fid)) {
475	*vpp = coda_ctlvp;
476	vref(coda_ctlvp);
477	MARK_INT_SAT(CODA_VGET_STATS);
478	return(0);
479    }
480
481    error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
482
483    if (error) {
484	CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
485	    *vpp = (struct vnode *)0;
486    } else {
487	CODADEBUG(CODA_VGET,
488		 myprintf(("vget: %s type %d result %d\n",
489			coda_f2s(&VFid), vtype, error)); )
490	cp = make_coda_node(&VFid, vfsp, vtype);
491	*vpp = CTOV(cp);
492    }
493    return(error);
494}
495
496/*
497 * To allow for greater ease of use, some vnodes may be orphaned when
498 * Venus dies.  Certain operations should still be allowed to go
499 * through, but without propagating ophan-ness.  So this function will
500 * get a new vnode for the file from the current run of Venus.  */
501
502int
503getNewVnode(vpp)
504     struct vnode **vpp;
505{
506    struct cfid cfid;
507    struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
508
509    ENTRY;
510
511    cfid.cfid_len = (short)sizeof(CodaFid);
512    cfid.cfid_fid = VTOC(*vpp)->c_fid;	/* Structure assignment. */
513    /* XXX ? */
514
515    /* We're guessing that if set, the 1st element on the list is a
516     * valid vnode to use. If not, return ENODEV as venus is dead.
517     */
518    if (mi->mi_vfsp == NULL)
519	return ENODEV;
520
521    return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
522		      NULL, NULL);
523}
524
525#include <ufs/ufs/extattr.h>
526#include <ufs/ufs/quota.h>
527#include <ufs/ufs/ufsmount.h>
528/* get the mount structure corresponding to a given device.  Assume
529 * device corresponds to a UFS. Return NULL if no device is found.
530 */
531struct mount *devtomp(dev)
532    struct cdev *dev;
533{
534    struct mount *mp;
535
536    TAILQ_FOREACH(mp, &mountlist, mnt_list) {
537	if (((VFSTOUFS(mp))->um_dev == dev)) {
538	    /* mount corresponds to UFS and the device matches one we want */
539	    return(mp);
540	}
541    }
542    /* mount structure wasn't found */
543    return(NULL);
544}
545
546struct vfsops coda_vfsops = {
547    .vfs_omount =		coda_omount,
548    .vfs_root = 		coda_root,
549    .vfs_start =		coda_start,
550    .vfs_statfs =		coda_nb_statfs,
551    .vfs_sync = 		coda_sync,
552    .vfs_unmount =		coda_unmount,
553};
554
555VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
556