3 * Coda: an Experimental Distributed File System
6 * Copyright (c) 1987-1998 Carnegie Mellon University
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
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.
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.
29 * @(#) src/sys/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
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.
42 * This code was written for the Coda file system at Carnegie Mellon
43 * University. Contributers include David Steere, James Kistler, and
49 #include <sys/param.h>
50 #include <sys/systm.h>
51 #include <sys/kernel.h>
53 #include <sys/malloc.h>
55 #include <sys/namei.h>
56 #include <sys/mount.h>
57 #include <sys/select.h>
59 #include <vm/vm_zone.h>
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>
68 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
71 int coda_vfsop_print_entry = 0;
72 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
74 struct vnode *coda_ctlvp;
75 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
77 /* structure to keep statistics of internally generated/satisfied calls */
79 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
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++)
86 extern int coda_nc_initialized; /* Set if cache has been initialized */
87 extern int vc_nb_open __P((dev_t, int, int, struct proc *));
90 coda_vfsopstats_init(void)
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;
107 * Set up mount info record and attach it to vfs struct.
111 coda_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 */
121 struct coda_mntinfo *mi;
122 struct vnode *rootvp;
129 coda_vfsopstats_init();
130 coda_vnodeopstats_init();
132 MARK_ENTRY(CODA_MOUNT_STATS);
133 if (CODA_MOUNTED(vfsp)) {
134 MARK_INT_FAIL(CODA_MOUNT_STATS);
138 /* Validate mount device. Similar to getmdev(). */
139 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p);
144 MARK_INT_FAIL(CODA_MOUNT_STATS);
147 if (dvp->v_type != VCHR) {
148 MARK_INT_FAIL(CODA_MOUNT_STATS);
150 NDFREE(ndp, NDF_ONLY_PNBUF);
155 NDFREE(ndp, NDF_ONLY_PNBUF);
158 * See if the device table matches our expectations.
160 if (devsw(dev)->d_open != vc_nb_open)
162 MARK_INT_FAIL(CODA_MOUNT_STATS);
166 if (minor(dev) >= NVCODA || minor(dev) < 0) {
167 MARK_INT_FAIL(CODA_MOUNT_STATS);
172 * Initialize the mount record and link it to the vfs struct
174 mi = &coda_mnttbl[minor(dev)];
176 if (!VC_OPEN(&mi->mi_vcomm)) {
177 MARK_INT_FAIL(CODA_MOUNT_STATS);
181 /* No initialization (here) of mi_vcomm! */
182 vfsp->mnt_data = (qaddr_t)mi;
183 vfs_getnewfsid (vfsp);
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.
195 cp = make_coda_node(&rootfid, vfsp, VDIR);
197 rootvp->v_flag |= VROOT;
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.
207 cp = make_coda_node(&ctlfid, 0, VCHR);
209 coda_ctlvp = CTOV(cp);
211 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
213 mi->mi_rootvp = rootvp;
215 /* set filesystem block size */
216 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
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;
224 /* error is currently guaranteed to be zero, but in case some
227 myprintf(("coda_mount returned %d\n",error)););
229 MARK_INT_FAIL(CODA_MOUNT_STATS);
231 MARK_INT_SAT(CODA_MOUNT_STATS);
237 coda_unmount(vfsp, mntflags, p)
242 struct coda_mntinfo *mi = vftomi(vfsp);
243 int active, error = 0;
246 MARK_ENTRY(CODA_UMOUNT_STATS);
247 if (!CODA_MOUNTED(vfsp)) {
248 MARK_INT_FAIL(CODA_UMOUNT_STATS);
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 */
257 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
259 vrele(mi->mi_rootvp);
261 active = coda_kill(vfsp, NOT_DOWNCALL);
262 mi->mi_rootvp->v_flag &= ~VROOT;
263 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
264 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
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
269 /* vfsp->VFS_DATA = NULL; */
271 /* No more vfsp's to hold onto */
273 mi->mi_rootvp = NULL;
276 MARK_INT_FAIL(CODA_UMOUNT_STATS);
278 MARK_INT_SAT(CODA_UMOUNT_STATS);
293 struct coda_mntinfo *mi = vftomi(vfsp);
294 struct vnode **result;
296 struct proc *p = curproc; /* XXX - bnoble */
300 MARK_ENTRY(CODA_ROOT_STATS);
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 */
312 vn_lock(*vpp, LK_EXCLUSIVE, p);
314 vget(*vpp, LK_EXCLUSIVE, p);
316 MARK_INT_SAT(CODA_ROOT_STATS);
321 error = venus_root(vftomi(vfsp), p->p_ucred, p, &VFid);
325 * Save the new rootfid in the cnode, and rehash the cnode into the
326 * cnode hash with the new fid key.
328 coda_unsave(VTOC(mi->mi_rootvp));
329 VTOC(mi->mi_rootvp)->c_fid = VFid;
330 coda_save(VTOC(mi->mi_rootvp));
332 *vpp = mi->mi_rootvp;
335 vn_lock(*vpp, LK_EXCLUSIVE, p);
337 vget(*vpp, LK_EXCLUSIVE, p);
340 MARK_INT_SAT(CODA_ROOT_STATS);
342 } else if (error == ENODEV || error == EINTR) {
343 /* Gross hack here! */
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
352 *vpp = mi->mi_rootvp;
355 vn_lock(*vpp, LK_EXCLUSIVE, p);
357 vget(*vpp, LK_EXCLUSIVE, p);
360 MARK_INT_FAIL(CODA_ROOT_STATS);
364 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
365 MARK_INT_FAIL(CODA_ROOT_STATS);
375 * Get file system statistics.
378 coda_nb_statfs(vfsp, sbp, p)
379 register struct mount *vfsp;
384 /* MARK_ENTRY(CODA_STATFS_STATS); */
385 if (!CODA_MOUNTED(vfsp)) {
386 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
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
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); */
413 * Flush any pending I/O.
416 coda_sync(vfsp, waitfor, cred, p)
423 MARK_ENTRY(CODA_SYNC_STATS);
424 MARK_INT_SAT(CODA_SYNC_STATS);
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.
434 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
435 register struct mount *vfsp;
440 struct ucred **creadanonp;
442 struct cfid *cfid = (struct cfid *)fhp;
443 struct cnode *cp = 0;
445 struct proc *p = curproc; /* XXX -mach */
451 MARK_ENTRY(CODA_VGET_STATS);
452 /* Check for vget of control object. */
453 if (IS_CTL_FID(&cfid->cfid_fid)) {
456 MARK_INT_SAT(CODA_VGET_STATS);
460 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_ucred, p, &VFid, &vtype);
463 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
464 *vpp = (struct vnode *)0;
467 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
468 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
470 cp = make_coda_node(&VFid, vfsp, vtype);
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. */
487 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
491 cfid.cfid_len = (short)sizeof(ViceFid);
492 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
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.
498 if (mi->mi_vfsp == NULL)
501 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
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.
510 struct mount *devtomp(dev)
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 */
521 /* mount structure wasn't found */
525 struct vfsops coda_vfsops = {
542 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);