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| Current File : //compat/linux/proc/self/root/sys/fs/coda/coda_vfsops.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: release/9.1.0/sys/fs/coda/coda_vfsops.c 206210 2010-04-05 20:12:54Z rwatson $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/fcntl.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 <fs/coda/coda.h>
#include <fs/coda/cnode.h>
#include <fs/coda/coda_vfsops.h>
#include <fs/coda/coda_venus.h>
#include <fs/coda/coda_subr.h>
#include <fs/coda/coda_opstats.h>
MALLOC_DEFINE(M_CODA, "coda", "Various Coda Structures");
int codadebug = 0;
int coda_vfsop_print_entry = 0;
#define ENTRY do { \
if (coda_vfsop_print_entry) \
myprintf(("Entered %s\n", __func__)); \
} while (0)
struct vnode *coda_ctlvp;
/*
* Structure to keep statistics of internally generated/satisfied calls.
*/
static 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++)
int
coda_vfsopstats_init(void)
{
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 vnode *dvp;
struct cnode *cp;
struct cdev *dev;
struct coda_mntinfo *mi;
struct vnode *rootvp;
struct CodaFid rootfid = INVAL_FID;
struct 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, curthread);
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 = 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, VREG);
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_mount returned %d\n", error)););
if (error)
MARK_INT_FAIL(CODA_MOUNT_STATS);
else
MARK_INT_SAT(CODA_MOUNT_STATS);
return (error);
}
int
coda_unmount(struct mount *vfsp, int mntflags)
{
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);
mi->mi_rootvp = NULL;
vrele(coda_ctlvp);
coda_ctlvp = NULL;
active = coda_kill(vfsp, NOT_DOWNCALL);
error = vflush(mi->mi_vfsp, 0, FORCECLOSE, curthread);
#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;
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(struct mount *vfsp, int flags, struct vnode **vpp)
{
struct coda_mntinfo *mi = vftomi(vfsp);
int error;
struct proc *p;
struct thread *td;
struct CodaFid VFid;
static const struct CodaFid invalfid = INVAL_FID;
td = curthread;
p = td->td_proc;
ENTRY;
MARK_ENTRY(CODA_ROOT_STATS);
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_mount() with all c_fid members zeroed.
*
* XXX In addition, we assume that the first call to
* coda_root() is from vfs_mount() (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(struct CodaFid)) != 0 || mi->mi_started == 0) {
/*
* Found valid root.
*/
*vpp = mi->mi_rootvp;
mi->mi_started = 1;
/*
* On Mach, this is vref. On FreeBSD, vref +
* vn_lock.
*/
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
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;
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
MARK_INT_SAT(CODA_ROOT_STATS);
} 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;
vref(*vpp);
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
MARK_INT_FAIL(CODA_ROOT_STATS);
error = 0;
} else {
CODADEBUG(CODA_ROOT, myprintf(("error %d in CODA_ROOT\n",
error)););
MARK_INT_FAIL(CODA_ROOT_STATS);
}
return (error);
}
/*
* Get filesystem statistics.
*/
int
coda_statfs(struct mount *vfsp, struct statfs *sbp)
{
ENTRY;
MARK_ENTRY(CODA_STATFS_STATS);
if (!CODA_MOUNTED(vfsp)) {
MARK_INT_FAIL(CODA_STATFS_STATS);
return (EINVAL);
}
/*
* XXX - what to do about f_flags, others? --bnoble
*
* We just make up free space counts that are sufficiently large.
*/
sbp->f_flags = 0;
sbp->f_bsize = 8192; /* XXX */
sbp->f_iosize = 8192; /* XXX */
#define CODA_SFS_SIZ 0x8AB75D
sbp->f_blocks = CODA_SFS_SIZ;
sbp->f_bfree = CODA_SFS_SIZ;
sbp->f_bavail = CODA_SFS_SIZ;
sbp->f_files = CODA_SFS_SIZ;
sbp->f_ffree = CODA_SFS_SIZ;
MARK_INT_SAT(CODA_STATFS_STATS);
return (0);
}
/*
* Flush any pending I/O.
*/
int
coda_sync(struct mount *vfsp, int waitfor)
{
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.
*
* XXX: coda_fhtovp is currently not hooked up, so no NFS export for Coda.
* We leave it here in the hopes that someone will find it someday and hook
* it up. Among other things, it will need some reworking to match the
* vfs_fhtovp_t prototype.
*/
int
coda_fhtovp(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 = NULL;
int error;
struct thread *td = curthread; /* XXX -mach */
struct proc *p = td->td_proc;
struct 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 = NULL;
} 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);
}
struct vfsops coda_vfsops = {
.vfs_mount = coda_mount,
.vfs_root = coda_root,
.vfs_statfs = coda_statfs,
.vfs_sync = coda_sync,
.vfs_unmount = coda_unmount,
};
VFS_SET(coda_vfsops, coda, VFCF_NETWORK);