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 <coda/coda.h>
60 #include <coda/cnode.h>
61 #include <coda/coda_vfsops.h>
62 #include <coda/coda_venus.h>
63 #include <coda/coda_subr.h>
64 #include <coda/coda_opstats.h>
66 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
69 int coda_vfsop_print_entry = 0;
70 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__FUNCTION__))
72 struct vnode *coda_ctlvp;
73 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
75 /* structure to keep statistics of internally generated/satisfied calls */
77 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
79 #define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
80 #define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
81 #define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
82 #define MRAK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
84 extern int coda_nc_initialized; /* Set if cache has been initialized */
85 extern int vc_nb_open __P((dev_t, int, int, struct proc *));
88 coda_vfsopstats_init(void)
92 for (i=0;i<CODA_VFSOPS_SIZE;i++) {
93 coda_vfsopstats[i].opcode = i;
94 coda_vfsopstats[i].entries = 0;
95 coda_vfsopstats[i].sat_intrn = 0;
96 coda_vfsopstats[i].unsat_intrn = 0;
97 coda_vfsopstats[i].gen_intrn = 0;
105 * Set up mount info record and attach it to vfs struct.
109 coda_mount(vfsp, path, data, ndp, p)
110 struct mount *vfsp; /* Allocated and initialized by mount(2) */
111 char *path; /* path covered: ignored by the fs-layer */
112 caddr_t data; /* Need to define a data type for this in netbsd? */
113 struct nameidata *ndp; /* Clobber this to lookup the device name */
114 struct proc *p; /* The ever-famous proc pointer */
119 struct coda_mntinfo *mi;
120 struct vnode *rootvp;
127 coda_vfsopstats_init();
128 coda_vnodeopstats_init();
130 MARK_ENTRY(CODA_MOUNT_STATS);
131 if (CODA_MOUNTED(vfsp)) {
132 MARK_INT_FAIL(CODA_MOUNT_STATS);
136 /* Validate mount device. Similar to getmdev(). */
138 NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, data, p);
143 MARK_INT_FAIL(CODA_MOUNT_STATS);
146 if (dvp->v_type != VCHR) {
147 MARK_INT_FAIL(CODA_MOUNT_STATS);
155 * See if the device table matches our expectations.
157 if (devsw(dev)->d_open != vc_nb_open)
159 MARK_INT_FAIL(CODA_MOUNT_STATS);
163 if (minor(dev) >= NVCODA || minor(dev) < 0) {
164 MARK_INT_FAIL(CODA_MOUNT_STATS);
169 * Initialize the mount record and link it to the vfs struct
171 mi = &coda_mnttbl[minor(dev)];
173 if (!VC_OPEN(&mi->mi_vcomm)) {
174 MARK_INT_FAIL(CODA_MOUNT_STATS);
178 /* No initialization (here) of mi_vcomm! */
179 vfsp->mnt_data = (qaddr_t)mi;
180 vfs_getnewfsid (vfsp);
185 * Make a root vnode to placate the Vnode interface, but don't
186 * actually make the CODA_ROOT call to venus until the first call
187 * to coda_root in case a server is down while venus is starting.
192 cp = make_coda_node(&rootfid, vfsp, VDIR);
194 rootvp->v_flag |= VROOT;
196 ctlfid.Volume = CTL_VOL;
197 ctlfid.Vnode = CTL_VNO;
198 ctlfid.Unique = CTL_UNI;
199 /* cp = make_coda_node(&ctlfid, vfsp, VCHR);
200 The above code seems to cause a loop in the cnode links.
201 I don't totally understand when it happens, it is caught
202 when closing down the system.
204 cp = make_coda_node(&ctlfid, 0, VCHR);
206 coda_ctlvp = CTOV(cp);
208 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
210 mi->mi_rootvp = rootvp;
212 /* set filesystem block size */
213 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
215 /* Set f_iosize. XXX -- inamura@isl.ntt.co.jp.
216 For vnode_pager_haspage() references. The value should be obtained
217 from underlying UFS. */
218 /* Checked UFS. iosize is set as 8192 */
219 vfsp->mnt_stat.f_iosize = 8192;
221 /* error is currently guaranteed to be zero, but in case some
224 myprintf(("coda_mount returned %d\n",error)););
226 MARK_INT_FAIL(CODA_MOUNT_STATS);
228 MARK_INT_SAT(CODA_MOUNT_STATS);
234 coda_unmount(vfsp, mntflags, p)
239 struct coda_mntinfo *mi = vftomi(vfsp);
240 int active, error = 0;
243 MARK_ENTRY(CODA_UMOUNT_STATS);
244 if (!CODA_MOUNTED(vfsp)) {
245 MARK_INT_FAIL(CODA_UMOUNT_STATS);
249 if (mi->mi_vfsp == vfsp) { /* We found the victim */
250 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
251 return (EBUSY); /* Venus is still running */
254 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
256 vrele(mi->mi_rootvp);
258 active = coda_kill(vfsp, NOT_DOWNCALL);
259 mi->mi_rootvp->v_flag &= ~VROOT;
260 error = vflush(mi->mi_vfsp, NULLVP, FORCECLOSE);
261 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
263 /* I'm going to take this out to allow lookups to go through. I'm
264 * not sure it's important anyway. -- DCS 2/2/94
266 /* vfsp->VFS_DATA = NULL; */
268 /* No more vfsp's to hold onto */
270 mi->mi_rootvp = NULL;
273 MARK_INT_FAIL(CODA_UMOUNT_STATS);
275 MARK_INT_SAT(CODA_UMOUNT_STATS);
290 struct coda_mntinfo *mi = vftomi(vfsp);
291 struct vnode **result;
293 struct proc *p = curproc; /* XXX - bnoble */
297 MARK_ENTRY(CODA_ROOT_STATS);
300 if (vfsp == mi->mi_vfsp) {
301 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
302 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
303 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
304 { /* Found valid root. */
305 *vpp = mi->mi_rootvp;
306 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
309 vn_lock(*vpp, LK_EXCLUSIVE, p);
311 vget(*vpp, LK_EXCLUSIVE, p);
313 MARK_INT_SAT(CODA_ROOT_STATS);
318 error = venus_root(vftomi(vfsp), p->p_cred->pc_ucred, p, &VFid);
322 * Save the new rootfid in the cnode, and rehash the cnode into the
323 * cnode hash with the new fid key.
325 coda_unsave(VTOC(mi->mi_rootvp));
326 VTOC(mi->mi_rootvp)->c_fid = VFid;
327 coda_save(VTOC(mi->mi_rootvp));
329 *vpp = mi->mi_rootvp;
332 vn_lock(*vpp, LK_EXCLUSIVE, p);
334 vget(*vpp, LK_EXCLUSIVE, p);
337 MARK_INT_SAT(CODA_ROOT_STATS);
339 } else if (error == ENODEV || error == EINTR) {
340 /* Gross hack here! */
342 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
343 * ENODEV. Return the uninitialized root vnode to allow vfs
344 * operations such as unmount to continue. Without this hack,
345 * there is no way to do an unmount if Venus dies before a
346 * successful CODA_ROOT call is done. All vnode operations
349 *vpp = mi->mi_rootvp;
352 vn_lock(*vpp, LK_EXCLUSIVE, p);
354 vget(*vpp, LK_EXCLUSIVE, p);
357 MARK_INT_FAIL(CODA_ROOT_STATS);
361 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
362 MARK_INT_FAIL(CODA_ROOT_STATS);
372 * Get file system statistics.
375 coda_nb_statfs(vfsp, sbp, p)
376 register struct mount *vfsp;
381 /* MARK_ENTRY(CODA_STATFS_STATS); */
382 if (!CODA_MOUNTED(vfsp)) {
383 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
387 bzero(sbp, sizeof(struct statfs));
388 /* XXX - what to do about f_flags, others? --bnoble */
389 /* Below This is what AFS does
390 #define NB_SFS_SIZ 0x895440
392 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
393 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
394 sbp->f_bsize = 8192; /* XXX */
395 sbp->f_iosize = 8192; /* XXX */
396 #define NB_SFS_SIZ 0x8AB75D
397 sbp->f_blocks = NB_SFS_SIZ;
398 sbp->f_bfree = NB_SFS_SIZ;
399 sbp->f_bavail = NB_SFS_SIZ;
400 sbp->f_files = NB_SFS_SIZ;
401 sbp->f_ffree = NB_SFS_SIZ;
402 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
403 snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
404 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
405 /* MARK_INT_SAT(CODA_STATFS_STATS); */
410 * Flush any pending I/O.
413 coda_sync(vfsp, waitfor, cred, p)
420 MARK_ENTRY(CODA_SYNC_STATS);
421 MARK_INT_SAT(CODA_SYNC_STATS);
426 * fhtovp is now what vget used to be in 4.3-derived systems. For
427 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
428 * a type-specific fid.
431 coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
432 register struct mount *vfsp;
437 struct ucred **creadanonp;
439 struct cfid *cfid = (struct cfid *)fhp;
440 struct cnode *cp = 0;
442 struct proc *p = curproc; /* XXX -mach */
448 MARK_ENTRY(CODA_VGET_STATS);
449 /* Check for vget of control object. */
450 if (IS_CTL_FID(&cfid->cfid_fid)) {
453 MARK_INT_SAT(CODA_VGET_STATS);
457 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, p->p_cred->pc_ucred, p, &VFid, &vtype);
460 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
461 *vpp = (struct vnode *)0;
464 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
465 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
467 cp = make_coda_node(&VFid, vfsp, vtype);
474 * To allow for greater ease of use, some vnodes may be orphaned when
475 * Venus dies. Certain operations should still be allowed to go
476 * through, but without propagating ophan-ness. So this function will
477 * get a new vnode for the file from the current run of Venus. */
484 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
488 cfid.cfid_len = (short)sizeof(ViceFid);
489 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
492 /* We're guessing that if set, the 1st element on the list is a
493 * valid vnode to use. If not, return ENODEV as venus is dead.
495 if (mi->mi_vfsp == NULL)
498 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
502 #include <ufs/ufs/quota.h>
503 #include <ufs/ufs/ufsmount.h>
504 /* get the mount structure corresponding to a given device. Assume
505 * device corresponds to a UFS. Return NULL if no device is found.
507 struct mount *devtomp(dev)
510 struct mount *mp, *nmp;
512 for (mp = mountlist.cqh_first; mp != (void*)&mountlist; mp = nmp) {
513 nmp = mp->mnt_list.cqe_next;
514 if (((VFSTOUFS(mp))->um_dev == dev)) {
515 /* mount corresponds to UFS and the device matches one we want */
519 /* mount structure wasn't found */
523 struct vfsops coda_vfsops = {
538 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);