934030b2c9
operations. But we don't have to, if we find the coda_mntinfo structure for this device in our linked list, we know the device is good. Submitted by: Jan Harkes <jaharkes@cs.cmu.edu> Approved by: re (kensmith)
527 lines
14 KiB
C
527 lines
14 KiB
C
/*-
|
|
* Coda: an Experimental Distributed File System
|
|
* Release 3.1
|
|
*
|
|
* Copyright (c) 1987-1998 Carnegie Mellon University
|
|
* All Rights Reserved
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and its
|
|
* documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation, and
|
|
* that credit is given to Carnegie Mellon University in all documents
|
|
* and publicity pertaining to direct or indirect use of this code or its
|
|
* derivatives.
|
|
*
|
|
* CODA IS AN EXPERIMENTAL SOFTWARE SYSTEM AND IS KNOWN TO HAVE BUGS,
|
|
* SOME OF WHICH MAY HAVE SERIOUS CONSEQUENCES. CARNEGIE MELLON ALLOWS
|
|
* FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION. CARNEGIE MELLON
|
|
* DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES WHATSOEVER
|
|
* RESULTING DIRECTLY OR INDIRECTLY FROM THE USE OF THIS SOFTWARE OR OF
|
|
* ANY DERIVATIVE WORK.
|
|
*
|
|
* Carnegie Mellon encourages users of this software to return any
|
|
* improvements or extensions that they make, and to grant Carnegie
|
|
* Mellon the rights to redistribute these changes without encumbrance.
|
|
*
|
|
* @(#) src/sys/cfs/coda_vfsops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
|
|
*/
|
|
/*-
|
|
* Mach Operating System
|
|
* Copyright (c) 1989 Carnegie-Mellon University
|
|
* All rights reserved. The CMU software License Agreement specifies
|
|
* the terms and conditions for use and redistribution.
|
|
*/
|
|
|
|
/*
|
|
* This code was written for the Coda filesystem at Carnegie Mellon
|
|
* University. Contributers include David Steere, James Kistler, and
|
|
* M. Satyanarayanan.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/namei.h>
|
|
#include <sys/proc.h>
|
|
|
|
#include <coda/coda.h>
|
|
#include <coda/cnode.h>
|
|
#include <coda/coda_vfsops.h>
|
|
#include <coda/coda_venus.h>
|
|
#include <coda/coda_subr.h>
|
|
#include <coda/coda_opstats.h>
|
|
|
|
MALLOC_DEFINE(M_CODA, "coda", "Various Coda Structures");
|
|
|
|
int codadebug = 0;
|
|
int coda_vfsop_print_entry = 0;
|
|
#define ENTRY if(coda_vfsop_print_entry) myprintf(("Entered %s\n",__func__))
|
|
|
|
struct vnode *coda_ctlvp;
|
|
|
|
/* structure to keep statistics of internally generated/satisfied calls */
|
|
|
|
struct coda_op_stats coda_vfsopstats[CODA_VFSOPS_SIZE];
|
|
|
|
#define MARK_ENTRY(op) (coda_vfsopstats[op].entries++)
|
|
#define MARK_INT_SAT(op) (coda_vfsopstats[op].sat_intrn++)
|
|
#define MARK_INT_FAIL(op) (coda_vfsopstats[op].unsat_intrn++)
|
|
#define MARK_INT_GEN(op) (coda_vfsopstats[op].gen_intrn++)
|
|
|
|
extern int coda_nc_initialized; /* Set if cache has been initialized */
|
|
extern int vc_nb_open(struct cdev *, int, int, struct thread *);
|
|
|
|
int
|
|
coda_vfsopstats_init(void)
|
|
{
|
|
register int i;
|
|
|
|
for (i=0;i<CODA_VFSOPS_SIZE;i++) {
|
|
coda_vfsopstats[i].opcode = i;
|
|
coda_vfsopstats[i].entries = 0;
|
|
coda_vfsopstats[i].sat_intrn = 0;
|
|
coda_vfsopstats[i].unsat_intrn = 0;
|
|
coda_vfsopstats[i].gen_intrn = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char *coda_opts[] = { "from", NULL };
|
|
/*
|
|
* cfs mount vfsop
|
|
* Set up mount info record and attach it to vfs struct.
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
coda_mount(struct mount *vfsp, struct thread *td)
|
|
{
|
|
struct vnode *dvp;
|
|
struct cnode *cp;
|
|
struct cdev *dev;
|
|
struct coda_mntinfo *mi;
|
|
struct vnode *rootvp;
|
|
CodaFid rootfid = INVAL_FID;
|
|
CodaFid ctlfid = CTL_FID;
|
|
int error;
|
|
struct nameidata ndp;
|
|
ENTRY;
|
|
char *from;
|
|
|
|
if (vfs_filteropt(vfsp->mnt_optnew, coda_opts))
|
|
return (EINVAL);
|
|
|
|
from = vfs_getopts(vfsp->mnt_optnew, "from", &error);
|
|
if (error)
|
|
return (error);
|
|
|
|
coda_vfsopstats_init();
|
|
coda_vnodeopstats_init();
|
|
|
|
MARK_ENTRY(CODA_MOUNT_STATS);
|
|
if (CODA_MOUNTED(vfsp)) {
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
return(EBUSY);
|
|
}
|
|
|
|
/* Validate mount device. Similar to getmdev(). */
|
|
NDINIT(&ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, from, td);
|
|
error = namei(&ndp);
|
|
dvp = ndp.ni_vp;
|
|
|
|
if (error) {
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
return (error);
|
|
}
|
|
if (dvp->v_type != VCHR) {
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
vrele(dvp);
|
|
NDFREE(&ndp, NDF_ONLY_PNBUF);
|
|
return(ENXIO);
|
|
}
|
|
dev = dvp->v_rdev;
|
|
vrele(dvp);
|
|
NDFREE(&ndp, NDF_ONLY_PNBUF);
|
|
|
|
/*
|
|
* Initialize the mount record and link it to the vfs struct
|
|
*/
|
|
mi = dev2coda_mntinfo(dev);
|
|
if (!mi) {
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
printf("Coda mount: %s is not a cfs device\n", from);
|
|
return(ENXIO);
|
|
}
|
|
|
|
if (!VC_OPEN(&mi->mi_vcomm)) {
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
return(ENODEV);
|
|
}
|
|
|
|
/* No initialization (here) of mi_vcomm! */
|
|
vfsp->mnt_data = (qaddr_t)mi;
|
|
vfs_getnewfsid (vfsp);
|
|
|
|
mi->mi_vfsp = vfsp;
|
|
mi->mi_started = 0; /* XXX See coda_root() */
|
|
|
|
/*
|
|
* Make a root vnode to placate the Vnode interface, but don't
|
|
* actually make the CODA_ROOT call to venus until the first call
|
|
* to coda_root in case a server is down while venus is starting.
|
|
*/
|
|
cp = make_coda_node(&rootfid, vfsp, VDIR);
|
|
rootvp = CTOV(cp);
|
|
rootvp->v_vflag |= VV_ROOT;
|
|
|
|
/* cp = make_coda_node(&ctlfid, vfsp, VCHR);
|
|
The above code seems to cause a loop in the cnode links.
|
|
I don't totally understand when it happens, it is caught
|
|
when closing down the system.
|
|
*/
|
|
cp = make_coda_node(&ctlfid, 0, VCHR);
|
|
|
|
coda_ctlvp = CTOV(cp);
|
|
|
|
/* Add vfs and rootvp to chain of vfs hanging off mntinfo */
|
|
mi->mi_vfsp = vfsp;
|
|
mi->mi_rootvp = rootvp;
|
|
|
|
vfs_mountedfrom(vfsp, from);
|
|
/* error is currently guaranteed to be zero, but in case some
|
|
code changes... */
|
|
CODADEBUG(1,
|
|
myprintf(("coda_omount returned %d\n",error)););
|
|
if (error)
|
|
MARK_INT_FAIL(CODA_MOUNT_STATS);
|
|
else
|
|
MARK_INT_SAT(CODA_MOUNT_STATS);
|
|
|
|
return(error);
|
|
}
|
|
|
|
int
|
|
coda_unmount(vfsp, mntflags, td)
|
|
struct mount *vfsp;
|
|
int mntflags;
|
|
struct thread *td;
|
|
{
|
|
struct coda_mntinfo *mi = vftomi(vfsp);
|
|
int active, error = 0;
|
|
|
|
ENTRY;
|
|
MARK_ENTRY(CODA_UMOUNT_STATS);
|
|
if (!CODA_MOUNTED(vfsp)) {
|
|
MARK_INT_FAIL(CODA_UMOUNT_STATS);
|
|
return(EINVAL);
|
|
}
|
|
|
|
if (mi->mi_vfsp == vfsp) { /* We found the victim */
|
|
if (!IS_UNMOUNTING(VTOC(mi->mi_rootvp)))
|
|
return (EBUSY); /* Venus is still running */
|
|
|
|
#ifdef DEBUG
|
|
printf("coda_unmount: ROOT: vp %p, cp %p\n", mi->mi_rootvp, VTOC(mi->mi_rootvp));
|
|
#endif
|
|
vrele(mi->mi_rootvp);
|
|
active = coda_kill(vfsp, NOT_DOWNCALL);
|
|
ASSERT_VOP_LOCKED(mi->mi_rootvp, "coda_unmount");
|
|
mi->mi_rootvp->v_vflag &= ~VV_ROOT;
|
|
error = vflush(mi->mi_vfsp, 0, FORCECLOSE, td);
|
|
#ifdef CODA_VERBOSE
|
|
printf("coda_unmount: active = %d, vflush active %d\n", active, error);
|
|
#endif
|
|
error = 0;
|
|
/* I'm going to take this out to allow lookups to go through. I'm
|
|
* not sure it's important anyway. -- DCS 2/2/94
|
|
*/
|
|
/* vfsp->VFS_DATA = NULL; */
|
|
|
|
/* No more vfsp's to hold onto */
|
|
mi->mi_vfsp = NULL;
|
|
mi->mi_rootvp = NULL;
|
|
|
|
if (error)
|
|
MARK_INT_FAIL(CODA_UMOUNT_STATS);
|
|
else
|
|
MARK_INT_SAT(CODA_UMOUNT_STATS);
|
|
|
|
return(error);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* find root of cfs
|
|
*/
|
|
int
|
|
coda_root(vfsp, flags, vpp, td)
|
|
struct mount *vfsp;
|
|
int flags;
|
|
struct vnode **vpp;
|
|
struct thread *td;
|
|
{
|
|
struct coda_mntinfo *mi = vftomi(vfsp);
|
|
struct vnode **result;
|
|
int error;
|
|
struct proc *p = td->td_proc;
|
|
CodaFid VFid;
|
|
static const CodaFid invalfid = INVAL_FID;
|
|
|
|
ENTRY;
|
|
MARK_ENTRY(CODA_ROOT_STATS);
|
|
result = NULL;
|
|
|
|
if (vfsp == mi->mi_vfsp) {
|
|
/*
|
|
* Cache the root across calls. We only need to pass the request
|
|
* on to Venus if the root vnode is the dummy we installed in
|
|
* coda_omount() with all c_fid members zeroed.
|
|
*
|
|
* XXX In addition, we assume that the first call to coda_root()
|
|
* is from vfs_omount()
|
|
* (before the call to checkdirs()) and return the dummy root
|
|
* node to avoid a deadlock. This bug is fixed in the Coda CVS
|
|
* repository but not in any released versions as of 6 Mar 2003.
|
|
*/
|
|
if (memcmp(&VTOC(mi->mi_rootvp)->c_fid, &invalfid,
|
|
sizeof(CodaFid)) != 0 || mi->mi_started == 0)
|
|
{ /* Found valid root. */
|
|
*vpp = mi->mi_rootvp;
|
|
mi->mi_started = 1;
|
|
|
|
/* On Mach, this is vref. On NetBSD, VOP_LOCK */
|
|
#if 1
|
|
vref(*vpp);
|
|
vn_lock(*vpp, LK_EXCLUSIVE, td);
|
|
#else
|
|
vget(*vpp, LK_EXCLUSIVE, td);
|
|
#endif
|
|
MARK_INT_SAT(CODA_ROOT_STATS);
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
error = venus_root(vftomi(vfsp), td->td_ucred, p, &VFid);
|
|
|
|
if (!error) {
|
|
/*
|
|
* Save the new rootfid in the cnode, and rehash the cnode into the
|
|
* cnode hash with the new fid key.
|
|
*/
|
|
coda_unsave(VTOC(mi->mi_rootvp));
|
|
VTOC(mi->mi_rootvp)->c_fid = VFid;
|
|
coda_save(VTOC(mi->mi_rootvp));
|
|
|
|
*vpp = mi->mi_rootvp;
|
|
#if 1
|
|
vref(*vpp);
|
|
vn_lock(*vpp, LK_EXCLUSIVE, td);
|
|
#else
|
|
vget(*vpp, LK_EXCLUSIVE, td);
|
|
#endif
|
|
|
|
MARK_INT_SAT(CODA_ROOT_STATS);
|
|
goto exit;
|
|
} else if (error == ENODEV || error == EINTR) {
|
|
/* Gross hack here! */
|
|
/*
|
|
* If Venus fails to respond to the CODA_ROOT call, coda_call returns
|
|
* ENODEV. Return the uninitialized root vnode to allow vfs
|
|
* operations such as unmount to continue. Without this hack,
|
|
* there is no way to do an unmount if Venus dies before a
|
|
* successful CODA_ROOT call is done. All vnode operations
|
|
* will fail.
|
|
*/
|
|
*vpp = mi->mi_rootvp;
|
|
#if 1
|
|
vref(*vpp);
|
|
vn_lock(*vpp, LK_EXCLUSIVE, td);
|
|
#else
|
|
vget(*vpp, LK_EXCLUSIVE, td);
|
|
#endif
|
|
|
|
MARK_INT_FAIL(CODA_ROOT_STATS);
|
|
error = 0;
|
|
goto exit;
|
|
} else {
|
|
CODADEBUG( CODA_ROOT, myprintf(("error %d in CODA_ROOT\n", error)); );
|
|
MARK_INT_FAIL(CODA_ROOT_STATS);
|
|
|
|
goto exit;
|
|
}
|
|
|
|
exit:
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* Get filesystem statistics.
|
|
*/
|
|
int
|
|
coda_nb_statfs(vfsp, sbp, td)
|
|
register struct mount *vfsp;
|
|
struct statfs *sbp;
|
|
struct thread *td;
|
|
{
|
|
ENTRY;
|
|
/* MARK_ENTRY(CODA_STATFS_STATS); */
|
|
if (!CODA_MOUNTED(vfsp)) {
|
|
/* MARK_INT_FAIL(CODA_STATFS_STATS);*/
|
|
return(EINVAL);
|
|
}
|
|
|
|
bzero(sbp, sizeof(struct statfs));
|
|
/* XXX - what to do about f_flags, others? --bnoble */
|
|
/* Below This is what AFS does
|
|
#define NB_SFS_SIZ 0x895440
|
|
*/
|
|
/* Note: Normal fs's have a bsize of 0x400 == 1024 */
|
|
sbp->f_type = vfsp->mnt_vfc->vfc_typenum;
|
|
sbp->f_bsize = 8192; /* XXX */
|
|
sbp->f_iosize = 8192; /* XXX */
|
|
#define NB_SFS_SIZ 0x8AB75D
|
|
sbp->f_blocks = NB_SFS_SIZ;
|
|
sbp->f_bfree = NB_SFS_SIZ;
|
|
sbp->f_bavail = NB_SFS_SIZ;
|
|
sbp->f_files = NB_SFS_SIZ;
|
|
sbp->f_ffree = NB_SFS_SIZ;
|
|
bcopy((caddr_t)&(vfsp->mnt_stat.f_fsid), (caddr_t)&(sbp->f_fsid), sizeof (fsid_t));
|
|
snprintf(sbp->f_mntonname, sizeof(sbp->f_mntonname), "/coda");
|
|
snprintf(sbp->f_fstypename, sizeof(sbp->f_fstypename), "coda");
|
|
/* MARK_INT_SAT(CODA_STATFS_STATS); */
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Flush any pending I/O.
|
|
*/
|
|
int
|
|
coda_sync(vfsp, waitfor, td)
|
|
struct mount *vfsp;
|
|
int waitfor;
|
|
struct thread *td;
|
|
{
|
|
ENTRY;
|
|
MARK_ENTRY(CODA_SYNC_STATS);
|
|
MARK_INT_SAT(CODA_SYNC_STATS);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* fhtovp is now what vget used to be in 4.3-derived systems. For
|
|
* some silly reason, vget is now keyed by a 32 bit ino_t, rather than
|
|
* a type-specific fid.
|
|
*/
|
|
int
|
|
coda_fhtovp(vfsp, fhp, nam, vpp, exflagsp, creadanonp)
|
|
register struct mount *vfsp;
|
|
struct fid *fhp;
|
|
struct mbuf *nam;
|
|
struct vnode **vpp;
|
|
int *exflagsp;
|
|
struct ucred **creadanonp;
|
|
{
|
|
struct cfid *cfid = (struct cfid *)fhp;
|
|
struct cnode *cp = 0;
|
|
int error;
|
|
struct thread *td = curthread; /* XXX -mach */
|
|
struct proc *p = td->td_proc;
|
|
CodaFid VFid;
|
|
int vtype;
|
|
|
|
ENTRY;
|
|
|
|
MARK_ENTRY(CODA_VGET_STATS);
|
|
/* Check for vget of control object. */
|
|
if (IS_CTL_FID(&cfid->cfid_fid)) {
|
|
*vpp = coda_ctlvp;
|
|
vref(coda_ctlvp);
|
|
MARK_INT_SAT(CODA_VGET_STATS);
|
|
return(0);
|
|
}
|
|
|
|
error = venus_fhtovp(vftomi(vfsp), &cfid->cfid_fid, td->td_ucred, p, &VFid, &vtype);
|
|
|
|
if (error) {
|
|
CODADEBUG(CODA_VGET, myprintf(("vget error %d\n",error));)
|
|
*vpp = (struct vnode *)0;
|
|
} else {
|
|
CODADEBUG(CODA_VGET,
|
|
myprintf(("vget: %s type %d result %d\n",
|
|
coda_f2s(&VFid), vtype, error)); )
|
|
cp = make_coda_node(&VFid, vfsp, vtype);
|
|
*vpp = CTOV(cp);
|
|
}
|
|
return(error);
|
|
}
|
|
|
|
/*
|
|
* To allow for greater ease of use, some vnodes may be orphaned when
|
|
* Venus dies. Certain operations should still be allowed to go
|
|
* through, but without propagating ophan-ness. So this function will
|
|
* get a new vnode for the file from the current run of Venus. */
|
|
|
|
int
|
|
getNewVnode(vpp)
|
|
struct vnode **vpp;
|
|
{
|
|
struct cfid cfid;
|
|
struct coda_mntinfo *mi = vftomi((*vpp)->v_mount);
|
|
|
|
ENTRY;
|
|
|
|
cfid.cfid_len = (short)sizeof(CodaFid);
|
|
cfid.cfid_fid = VTOC(*vpp)->c_fid; /* Structure assignment. */
|
|
/* XXX ? */
|
|
|
|
/* We're guessing that if set, the 1st element on the list is a
|
|
* valid vnode to use. If not, return ENODEV as venus is dead.
|
|
*/
|
|
if (mi->mi_vfsp == NULL)
|
|
return ENODEV;
|
|
|
|
return coda_fhtovp(mi->mi_vfsp, (struct fid*)&cfid, NULL, vpp,
|
|
NULL, NULL);
|
|
}
|
|
|
|
#include <ufs/ufs/extattr.h>
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/ufsmount.h>
|
|
/* get the mount structure corresponding to a given device. Assume
|
|
* device corresponds to a UFS. Return NULL if no device is found.
|
|
*/
|
|
struct mount *devtomp(dev)
|
|
struct cdev *dev;
|
|
{
|
|
struct mount *mp;
|
|
|
|
TAILQ_FOREACH(mp, &mountlist, mnt_list) {
|
|
if (((VFSTOUFS(mp))->um_dev == dev)) {
|
|
/* mount corresponds to UFS and the device matches one we want */
|
|
return(mp);
|
|
}
|
|
}
|
|
/* mount structure wasn't found */
|
|
return(NULL);
|
|
}
|
|
|
|
struct vfsops coda_vfsops = {
|
|
.vfs_mount = coda_mount,
|
|
.vfs_root = coda_root,
|
|
.vfs_statfs = coda_nb_statfs,
|
|
.vfs_sync = coda_sync,
|
|
.vfs_unmount = coda_unmount,
|
|
};
|
|
|
|
VFS_SET(coda_vfsops, coda, VFCF_NETWORK);
|