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 $
30 * $FreeBSD: src/sys/coda/coda_vfsops.c,v 1.24.2.1 2001/07/26 20:36:45 iedowse Exp $
31 * $DragonFly: src/sys/vfs/coda/Attic/coda_vfsops.c,v 1.25 2006/07/28 02:17:41 dillon Exp $
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.
43 * This code was written for the Coda file system at Carnegie Mellon
44 * University. Contributers include David Steere, James Kistler, and
48 #include "use_vcoda.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
54 #include <sys/malloc.h>
56 #include <sys/nlookup.h>
57 #include <sys/mount.h>
58 #include <sys/select.h>
60 #include <vm/vm_zone.h>
64 #include "coda_vfsops.h"
65 #include "coda_venus.h"
66 #include "coda_subr.h"
67 #include "coda_opstats.h"
69 MALLOC_DEFINE(M_CODA, "CODA storage", "Various Coda Structures");
72 int coda_vfsop_print_entry = 0;
73 #define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
75 struct vnode *coda_ctlvp;
76 struct coda_mntinfo coda_mnttbl[NVCODA]; /* indexed by minor device number */
78 /* structure to keep statistics of internally generated/satisfied calls */
80 struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
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++)
87 extern int coda_nc_initialized; /* Set if cache has been initialized */
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(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
115 struct ucred *cred) /* Mount credential */
120 struct coda_mntinfo *mi;
121 struct vnode *rootvp;
125 struct nlookupdata nd;
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(). */
140 error = nlookup_init(&nd, data, UIO_USERSPACE, NLC_FOLLOW);
142 error = nlookup(&nd);
144 error = cache_vref(nd.nl_ncp, nd.nl_cred, &dvp);
147 MARK_INT_FAIL(CODA_MOUNT_STATS);
150 if (dvp->v_type != VCHR) {
151 MARK_INT_FAIL(CODA_MOUNT_STATS);
158 if (uminor(udev) >= NVCODA || uminor(udev) < 0) {
159 MARK_INT_FAIL(CODA_MOUNT_STATS);
164 * Initialize the mount record and link it to the vfs struct
166 mi = &coda_mnttbl[uminor(udev)];
168 if (!VC_OPEN(&mi->mi_vcomm)) {
169 MARK_INT_FAIL(CODA_MOUNT_STATS);
173 /* No initialization (here) of mi_vcomm! */
174 vfsp->mnt_data = (qaddr_t)mi;
175 vfs_getnewfsid (vfsp);
180 * Make a root vnode to placate the Vnode interface, but don't
181 * actually make the CODA_ROOT call to venus until the first call
182 * to coda_root in case a server is down while venus is starting.
187 cp = make_coda_node(&rootfid, vfsp, VDIR);
189 rootvp->v_flag |= VROOT;
191 ctlfid.Volume = CTL_VOL;
192 ctlfid.Vnode = CTL_VNO;
193 ctlfid.Unique = CTL_UNI;
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.
199 cp = make_coda_node(&ctlfid, 0, VCHR);
201 coda_ctlvp = CTOV(cp);
203 /* Add vfs and rootvp to chain of vfs hanging off mntinfo */
205 mi->mi_rootvp = rootvp;
207 /* set filesystem block size */
208 vfsp->mnt_stat.f_bsize = 8192; /* XXX -JJK */
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;
216 /* error is currently guaranteed to be zero, but in case some
219 myprintf(("coda_mount returned %d\n",error)););
221 MARK_INT_FAIL(CODA_MOUNT_STATS);
223 MARK_INT_SAT(CODA_MOUNT_STATS);
229 coda_unmount(struct mount *vfsp, int mntflags)
231 struct coda_mntinfo *mi = vftomi(vfsp);
232 int active, error = 0;
235 MARK_ENTRY(CODA_UMOUNT_STATS);
236 if (!CODA_MOUNTED(vfsp)) {
237 MARK_INT_FAIL(CODA_UMOUNT_STATS);
241 if (mi->mi_vfsp == vfsp) { /* We found the victim */
242 if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
243 return (EBUSY); /* Venus is still running */
246 printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
248 vrele(mi->mi_rootvp);
250 active = coda_kill(vfsp, NOT_DOWNCALL);
251 mi->mi_rootvp->v_flag &= ~VROOT;
252 error = vflush(mi->mi_vfsp, 0, FORCECLOSE);
253 printf("coda_unmount: active = %d, vflush active %d\n", active, error);
255 /* I'm going to take this out to allow lookups to go through. I'm
256 * not sure it's important anyway. -- DCS 2/2/94
258 /* vfsp->VFS_DATA = NULL; */
260 /* No more vfsp's to hold onto */
262 mi->mi_rootvp = NULL;
265 MARK_INT_FAIL(CODA_UMOUNT_STATS);
267 MARK_INT_SAT(CODA_UMOUNT_STATS);
278 coda_root(struct mount *vfsp, struct vnode **vpp)
280 struct coda_mntinfo *mi = vftomi(vfsp);
281 struct vnode **result;
283 struct thread *td = curthread; /* XXX - bnoble */
287 KKASSERT(td->td_proc);
288 cred = td->td_proc->p_ucred;
291 MARK_ENTRY(CODA_ROOT_STATS);
294 if (vfsp == mi->mi_vfsp) {
295 if ((VTOC(mi->mi_rootvp)->c_fid.Volume != 0) ||
296 (VTOC(mi->mi_rootvp)->c_fid.Vnode != 0) ||
297 (VTOC(mi->mi_rootvp)->c_fid.Unique != 0))
298 { /* Found valid root. */
299 *vpp = mi->mi_rootvp;
300 /* On Mach, this is vref. On NetBSD, VOP_LOCK */
301 vget(*vpp, LK_EXCLUSIVE);
302 MARK_INT_SAT(CODA_ROOT_STATS);
307 error = venus_root(vftomi(vfsp), cred, td, &VFid);
311 * Save the new rootfid in the cnode, and rehash the cnode into the
312 * cnode hash with the new fid key.
314 coda_unsave(VTOC(mi->mi_rootvp));
315 VTOC(mi->mi_rootvp)->c_fid = VFid;
316 coda_save(VTOC(mi->mi_rootvp));
318 *vpp = mi->mi_rootvp;
319 vget(*vpp, LK_EXCLUSIVE);
321 MARK_INT_SAT(CODA_ROOT_STATS);
323 } else if (error == ENODEV || error == EINTR) {
324 /* Gross hack here! */
326 * If Venus fails to respond to the CODA_ROOT call, coda_call returns
327 * ENODEV. Return the uninitialized root vnode to allow vfs
328 * operations such as unmount to continue. Without this hack,
329 * there is no way to do an unmount if Venus dies before a
330 * successful CODA_ROOT call is done. All vnode operations
333 *vpp = mi->mi_rootvp;
334 vget(*vpp, LK_EXCLUSIVE);
336 MARK_INT_FAIL(CODA_ROOT_STATS);
340 CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
341 MARK_INT_FAIL(CODA_ROOT_STATS);
351 * Get file system statistics.
354 coda_nb_statfs(struct mount *vfsp, struct statfs *sbp, struct ucred *cred)
357 /* MARK_ENTRY(CODA_STATFS_STATS); */
358 if (!CODA_MOUNTED(vfsp)) {
359 /* MARK_INT_FAIL(CODA_STATFS_STATS);*/
363 bzero(sbp, sizeof(struct statfs));
364 /* XXX - what to do about f_flags, others? --bnoble */
365 /* Below This is what AFS does
366 #define NB_SFS_SIZ 0x895440
368 /* Note: Normal fs's have a bsize of 0x400 == 1024 */
369 sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
370 sbp->f_bsize = 8192; /* XXX */
371 sbp->f_iosize = 8192; /* XXX */
372 #define NB_SFS_SIZ 0x8AB75D
373 sbp->f_blocks = NB_SFS_SIZ;
374 sbp->f_bfree = NB_SFS_SIZ;
375 sbp->f_bavail = NB_SFS_SIZ;
376 sbp->f_files = NB_SFS_SIZ;
377 sbp->f_ffree = NB_SFS_SIZ;
378 bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
379 snprintf(sbp->f_mntfromname, sizeof(sbp->f_mntfromname), "CODA");
380 /* MARK_INT_SAT(CODA_STATFS_STATS); */
385 * Flush any pending I/O.
388 coda_sync(struct mount *vfsp, int waitfor)
391 MARK_ENTRY(CODA_SYNC_STATS);
392 MARK_INT_SAT(CODA_SYNC_STATS);
397 * fhtovp is now what vget used to be in 4.3-derived systems. For
398 * some silly reason, vget is now keyed by a 32 bit ino_t, rather than
399 * a type-specific fid.
402 coda_fhtovp(struct mount *vfsp, struct fid *fhp, struct mbuf *nam,
403 struct vnode **vpp, int *exflagsp, struct ucred **creadanonp)
405 struct cfid *cfid = (struct cfid *)fhp;
406 struct cnode *cp = 0;
408 struct thread *td = curthread; /* XXX -mach */
413 KKASSERT(td->td_proc);
414 cred = td->td_proc->p_ucred;
418 MARK_ENTRY(CODA_VGET_STATS);
419 /* Check for vget of control object. */
420 if (IS_CTL_FID(&cfid->cfid_fid)) {
423 MARK_INT_SAT(CODA_VGET_STATS);
427 error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, cred, td, &VFid, &vtype);
430 CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
431 *vpp = (struct vnode *)0;
434 myprintf(("vget: vol %lx vno %lx uni %lx type %d result %d\n",
435 VFid.Volume, VFid.Vnode, VFid.Unique, vtype, error)); )
437 cp = make_coda_node(&VFid, vfsp, vtype);
444 * To allow for greater ease of use, some vnodes may be orphaned when
445 * Venus dies. Certain operations should still be allowed to go
446 * through, but without propagating orphan-ness. So this function will
447 * get a new vnode for the file from the current run of Venus.
451 getNewVnode(struct vnode **vpp)
454 struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
458 cfid.cfid_len = (short)sizeof(ViceFid);
459 cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
462 /* We're guessing that if set, the 1st element on the list is a
463 * valid vnode to use. If not, return ENODEV as venus is dead.
465 if (mi->mi_vfsp == NULL)
468 return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
472 #include <vfs/ufs/quota.h>
473 #include <vfs/ufs/ufsmount.h>
476 * get the mount structure corresponding to a given device. Assume
477 * device corresponds to a UFS. Return NULL if no device is found.
479 struct devtomp_info {
480 struct mount *ret_mp;
484 static int devtomp_callback(struct mount *mp, void *data);
489 struct devtomp_info info;
494 mountlist_scan(devtomp_callback, &info, MNTSCAN_FORWARD|MNTSCAN_NOBUSY);
499 devtomp_callback(struct mount *mp, void *data)
501 struct devtomp_info *info = data;
503 if ((VFSTOUFS(mp))->um_dev == info->dev) {
510 struct vfsops coda_vfsops = {
511 .vfs_mount = coda_mount,
512 .vfs_unmount = coda_unmount,
513 .vfs_root = coda_root,
514 .vfs_statfs = coda_nb_statfs,
515 .vfs_sync = coda_sync
518 VFS_SET(coda_vfsops, coda, VFCF_NETWORK);