coda_vfsops.c revision 120011 
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 120011 2003-09-13 01:13:56Z tjr $");
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(dev_t, int, int, struct thread *);
85
86int
87coda_vfsopstats_init(void)
88{
89	register int i;
90
91	for (i=0;i<CODA_VFSOPS_SIZE;i++) {
92		coda_vfsopstats[i].opcode = i;
93		coda_vfsopstats[i].entries = 0;
94		coda_vfsopstats[i].sat_intrn = 0;
95		coda_vfsopstats[i].unsat_intrn = 0;
96		coda_vfsopstats[i].gen_intrn = 0;
97	}
98
99	return 0;
100}
101
102/*
103 * cfs mount vfsop
104 * Set up mount info record and attach it to vfs struct.
105 */
106/*ARGSUSED*/
107int
108coda_mount(vfsp, path, data, ndp, td)
109    struct mount *vfsp;		/* Allocated and initialized by mount(2) */
110    char *path;			/* path covered: ignored by the fs-layer */
111    caddr_t data;		/* Need to define a data type for this in netbsd? */
112    struct nameidata *ndp;	/* Clobber this to lookup the device name */
113    struct thread *td;
114{
115    struct vnode *dvp;
116    struct cnode *cp;
117    dev_t dev;
118    struct coda_mntinfo *mi;
119    struct vnode *rootvp;
120    CodaFid rootfid = INVAL_FID;
121    CodaFid ctlfid = CTL_FID;
122    int error;
123
124    ENTRY;
125
126    coda_vfsopstats_init();
127    coda_vnodeopstats_init();
128
129    MARK_ENTRY(CODA_MOUNT_STATS);
130    if (CODA_MOUNTED(vfsp)) {
131	MARK_INT_FAIL(CODA_MOUNT_STATS);
132	return(EBUSY);
133    }
134
135    /* Validate mount device.  Similar to getmdev(). */
136    NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, td);
137    error = namei(ndp);
138    dvp = ndp->ni_vp;
139
140    if (error) {
141	MARK_INT_FAIL(CODA_MOUNT_STATS);
142	return (error);
143    }
144    if (dvp->v_type != VCHR) {
145	MARK_INT_FAIL(CODA_MOUNT_STATS);
146	vrele(dvp);
147	NDFREE(ndp, NDF_ONLY_PNBUF);
148	return(ENXIO);
149    }
150    dev = dvp->v_rdev;
151    vrele(dvp);
152    NDFREE(ndp, NDF_ONLY_PNBUF);
153
154    /*
155     * See if the device table matches our expectations.
156     */
157    if (devsw(dev)->d_open != vc_nb_open)
158    {
159	MARK_INT_FAIL(CODA_MOUNT_STATS);
160	return(ENXIO);
161    }
162
163    if (minor(dev) >= NVCODA || minor(dev) < 0) {
164	MARK_INT_FAIL(CODA_MOUNT_STATS);
165	return(ENXIO);
166    }
167
168    /*
169     * Initialize the mount record and link it to the vfs struct
170     */
171    mi = &coda_mnttbl[minor(dev)];
172
173    if (!VC_OPEN(&mi->mi_vcomm)) {
174	MARK_INT_FAIL(CODA_MOUNT_STATS);
175	return(ENODEV);
176    }
177
178    /* No initialization (here) of mi_vcomm! */
179    vfsp->mnt_data = (qaddr_t)mi;
180    vfs_getnewfsid (vfsp);
181
182    mi->mi_vfsp = vfsp;
183    mi->mi_started = 0;			/* XXX See coda_root() */
184
185    /*
186     * Make a root vnode to placate the Vnode interface, but don't
187     * actually make the CODA_ROOT call to venus until the first call
188     * to coda_root in case a server is down while venus is starting.
189     */
190    cp = make_coda_node(&rootfid, vfsp, VDIR);
191    rootvp = CTOV(cp);
192    rootvp->v_vflag |= VV_ROOT;
193
194/*  cp = make_coda_node(&ctlfid, vfsp, VCHR);
195    The above code seems to cause a loop in the cnode links.
196    I don't totally understand when it happens, it is caught
197    when closing down the system.
198 */
199    cp = make_coda_node(&ctlfid, 0, VCHR);
200
201    coda_ctlvp = CTOV(cp);
202
203    /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
204    mi->mi_vfsp = vfsp;
205    mi->mi_rootvp = rootvp;
206
207    /* set filesystem block size */
208    vfsp->mnt_stat.f_bsize = 8192;	    /* XXX -JJK */
209
210    /* Set f_iosize.  XXX -- inamura@isl.ntt.co.jp.
211       For vnode_pager_haspage() references. The value should be obtained
212       from underlying UFS. */
213    /* Checked UFS. iosize is set as 8192 */
214    vfsp->mnt_stat.f_iosize = 8192;
215
216    /* error is currently guaranteed to be zero, but in case some
217       code changes... */
218    CODADEBUG(1,
219	     myprintf(("coda_mount returned %d\n",error)););
220    if (error)
221	MARK_INT_FAIL(CODA_MOUNT_STATS);
222    else
223	MARK_INT_SAT(CODA_MOUNT_STATS);
224
225    return(error);
226}
227
228int
229coda_unmount(vfsp, mntflags, td)
230    struct mount *vfsp;
231    int mntflags;
232    struct thread *td;
233{
234    struct coda_mntinfo *mi = vftomi(vfsp);
235    int active, error = 0;
236
237    ENTRY;
238    MARK_ENTRY(CODA_UMOUNT_STATS);
239    if (!CODA_MOUNTED(vfsp)) {
240	MARK_INT_FAIL(CODA_UMOUNT_STATS);
241	return(EINVAL);
242    }
243
244    if (mi->mi_vfsp == vfsp) {	/* We found the victim */
245	if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
246	    return (EBUSY); 	/* Venus is still running */
247
248#ifdef	DEBUG
249	printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
250#endif
251	vrele(mi->mi_rootvp);
252	active = coda_kill(vfsp, NOT_DOWNCALL);
253	ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
254	mi->mi_rootvp->v_vflag &= ~VV_ROOT;
255	error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
256#ifdef CODA_VERBOSE
257	printf("coda_unmount: active = %d, vflush active %d\n", active, error);
258#endif
259	error = 0;
260	/* I'm going to take this out to allow lookups to go through. I'm
261	 * not sure it's important anyway. -- DCS 2/2/94
262	 */
263	/* vfsp->VFS_DATA = NULL; */
264
265	/* No more vfsp's to hold onto */
266	mi->mi_vfsp = NULL;
267	mi->mi_rootvp = NULL;
268
269	if (error)
270	    MARK_INT_FAIL(CODA_UMOUNT_STATS);
271	else
272	    MARK_INT_SAT(CODA_UMOUNT_STATS);
273
274	return(error);
275    }
276    return (EINVAL);
277}
278
279/*
280 * find root of cfs
281 */
282int
283coda_root(vfsp, vpp)
284	struct mount *vfsp;
285	struct vnode **vpp;
286{
287    struct coda_mntinfo *mi = vftomi(vfsp);
288    struct vnode **result;
289    int error;
290    struct thread *td = curthread;    /* XXX - bnoble */
291    struct proc *p = td->td_proc;
292    CodaFid VFid;
293    static const CodaFid invalfid = INVAL_FID;
294
295    ENTRY;
296    MARK_ENTRY(CODA_ROOT_STATS);
297    result = NULL;
298
299    if (vfsp == mi->mi_vfsp) {
300	/*
301	 * Cache the root across calls. We only need to pass the request
302	 * on to Venus if the root vnode is the dummy we installed in
303	 * coda_mount() with all c_fid members zeroed.
304	 *
305	 * XXX In addition, if we are called between coda_mount() and
306	 * coda_start(), we assume that the request is from vfs_mount()
307	 * (before the call to checkdirs()) and return the dummy root
308	 * node to avoid a deadlock. This bug is fixed in the Coda CVS
309	 * repository but not in any released versions as of 6 Mar 2003.
310	 */
311	if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
312	    sizeof(CodaFid)) != 0 || mi->mi_started == 0)
313	    { /* Found valid root. */
314		*vpp = mi->mi_rootvp;
315		/* On Mach, this is vref.  On NetBSD, VOP_LOCK */
316#if	1
317		vref(*vpp);
318		vn_lock(*vpp, LK_EXCLUSIVE, td);
319#else
320		vget(*vpp, LK_EXCLUSIVE, td);
321#endif
322		MARK_INT_SAT(CODA_ROOT_STATS);
323		return(0);
324	    }
325    }
326
327    error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
328
329    if (!error) {
330	/*
331	 * Save the new rootfid in the cnode, and rehash the cnode into the
332	 * cnode hash with the new fid key.
333	 */
334	coda_unsave(VTOC(mi->mi_rootvp));
335	VTOC(mi->mi_rootvp)->c_fid = VFid;
336	coda_save(VTOC(mi->mi_rootvp));
337
338	*vpp = mi->mi_rootvp;
339#if	1
340	vref(*vpp);
341	vn_lock(*vpp, LK_EXCLUSIVE, td);
342#else
343	vget(*vpp, LK_EXCLUSIVE, td);
344#endif
345
346	MARK_INT_SAT(CODA_ROOT_STATS);
347	goto exit;
348    } else if (error == ENODEV || error == EINTR) {
349	/* Gross hack here! */
350	/*
351	 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
352	 * ENODEV. Return the uninitialized root vnode to allow vfs
353	 * operations such as unmount to continue. Without this hack,
354	 * there is no way to do an unmount if Venus dies before a
355	 * successful CODA_ROOT call is done. All vnode operations
356	 * will fail.
357	 */
358	*vpp = mi->mi_rootvp;
359#if	1
360	vref(*vpp);
361	vn_lock(*vpp, LK_EXCLUSIVE, td);
362#else
363	vget(*vpp, LK_EXCLUSIVE, td);
364#endif
365
366	MARK_INT_FAIL(CODA_ROOT_STATS);
367	error = 0;
368	goto exit;
369    } else {
370	CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
371	MARK_INT_FAIL(CODA_ROOT_STATS);
372
373	goto exit;
374    }
375
376 exit:
377    return(error);
378}
379
380int
381coda_start(mp, flags, td)
382	struct mount *mp;
383	int flags;
384	struct thread *td;
385{
386
387	/* XXX See coda_root(). */
388	vftomi(mp)->mi_started = 1;
389	return (0);
390}
391
392/*
393 * Get filesystem statistics.
394 */
395int
396coda_nb_statfs(vfsp, sbp, td)
397    register struct mount *vfsp;
398    struct statfs *sbp;
399    struct thread *td;
400{
401    ENTRY;
402/*  MARK_ENTRY(CODA_STATFS_STATS); */
403    if (!CODA_MOUNTED(vfsp)) {
404/*	MARK_INT_FAIL(CODA_STATFS_STATS);*/
405	return(EINVAL);
406    }
407
408    bzero(sbp, sizeof(struct statfs));
409    /* XXX - what to do about f_flags, others? --bnoble */
410    /* Below This is what AFS does
411    	#define NB_SFS_SIZ 0x895440
412     */
413    /* Note: Normal fs's have a bsize of 0x400 == 1024 */
414    sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
415    sbp->f_bsize = 8192; /* XXX */
416    sbp->f_iosize = 8192; /* XXX */
417#define NB_SFS_SIZ 0x8AB75D
418    sbp->f_blocks = NB_SFS_SIZ;
419    sbp->f_bfree = NB_SFS_SIZ;
420    sbp->f_bavail = NB_SFS_SIZ;
421    sbp->f_files = NB_SFS_SIZ;
422    sbp->f_ffree = NB_SFS_SIZ;
423    bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
424    snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
425    snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
426    snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
427/*  MARK_INT_SAT(CODA_STATFS_STATS); */
428    return(0);
429}
430
431/*
432 * Flush any pending I/O.
433 */
434int
435coda_sync(vfsp, waitfor, cred, td)
436    struct mount *vfsp;
437    int    waitfor;
438    struct ucred *cred;
439    struct thread *td;
440{
441    ENTRY;
442    MARK_ENTRY(CODA_SYNC_STATS);
443    MARK_INT_SAT(CODA_SYNC_STATS);
444    return(0);
445}
446
447/*
448 * fhtovp is now what vget used to be in 4.3-derived systems.  For
449 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
450 * a type-specific fid.
451 */
452int
453coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
454    register struct mount *vfsp;
455    struct fid *fhp;
456    struct mbuf *nam;
457    struct vnode **vpp;
458    int *exflagsp;
459    struct ucred **creadanonp;
460{
461    struct cfid *cfid = (struct cfid *)fhp;
462    struct cnode *cp = 0;
463    int error;
464    struct thread *td = curthread; /* XXX -mach */
465    struct proc *p = td->td_proc;
466    CodaFid VFid;
467    int vtype;
468
469    ENTRY;
470
471    MARK_ENTRY(CODA_VGET_STATS);
472    /* Check for vget of control object. */
473    if (IS_CTL_FID(&cfid->cfid_fid)) {
474	*vpp = coda_ctlvp;
475	vref(coda_ctlvp);
476	MARK_INT_SAT(CODA_VGET_STATS);
477	return(0);
478    }
479
480    error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
481
482    if (error) {
483	CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
484	    *vpp = (struct vnode *)0;
485    } else {
486	CODADEBUG(CODA_VGET,
487		 myprintf(("vget: %s type %d result %d\n",
488			coda_f2s(&VFid), vtype, error)); )
489	cp = make_coda_node(&VFid, vfsp, vtype);
490	*vpp = CTOV(cp);
491    }
492    return(error);
493}
494
495/*
496 * To allow for greater ease of use, some vnodes may be orphaned when
497 * Venus dies.  Certain operations should still be allowed to go
498 * through, but without propagating ophan-ness.  So this function will
499 * get a new vnode for the file from the current run of Venus.  */
500
501int
502getNewVnode(vpp)
503     struct vnode **vpp;
504{
505    struct cfid cfid;
506    struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
507
508    ENTRY;
509
510    cfid.cfid_len = (short)sizeof(CodaFid);
511    cfid.cfid_fid = VTOC(*vpp)->c_fid;	/* Structure assignment. */
512    /* XXX ? */
513
514    /* We're guessing that if set, the 1st element on the list is a
515     * valid vnode to use. If not, return ENODEV as venus is dead.
516     */
517    if (mi->mi_vfsp == NULL)
518	return ENODEV;
519
520    return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
521		      NULL, NULL);
522}
523
524#include <ufs/ufs/extattr.h>
525#include <ufs/ufs/quota.h>
526#include <ufs/ufs/ufsmount.h>
527/* get the mount structure corresponding to a given device.  Assume
528 * device corresponds to a UFS. Return NULL if no device is found.
529 */
530struct mount *devtomp(dev)
531    dev_t dev;
532{
533    struct mount *mp;
534
535    TAILQ_FOREACH(mp, &mountlist, mnt_list) {
536	if (((VFSTOUFS(mp))->um_dev == dev)) {
537	    /* mount corresponds to UFS and the device matches one we want */
538	    return(mp);
539	}
540    }
541    /* mount structure wasn't found */
542    return(NULL);
543}
544
545struct vfsops coda_vfsops = {
546    .vfs_mount =		coda_mount,
547    .vfs_root = 		coda_root,
548    .vfs_start =		coda_start,
549    .vfs_statfs =		coda_nb_statfs,
550    .vfs_sync = 		coda_sync,
551    .vfs_unmount =		coda_unmount,
552};
553
554VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
555