| Current Path : /sys/fs/coda/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/fs/coda/coda_vnops.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/coda/coda_vnops.c,v 1.1.1.1 1998/08/29 21:14:52 rvb Exp $
*/
/*
* Mach Operating System
* Copyright (c) 1990 Carnegie-Mellon University
* 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_vnops.c 215548 2010-11-19 21:17:34Z kib $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/acct.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/file.h> /* Must come after sys/malloc.h */
#include <sys/mount.h>
#include <sys/mutex.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/unistd.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <fs/coda/coda.h>
#include <fs/coda/cnode.h>
#include <fs/coda/coda_vnops.h>
#include <fs/coda/coda_venus.h>
#include <fs/coda/coda_opstats.h>
#include <fs/coda/coda_subr.h>
#include <fs/coda/coda_pioctl.h>
/*
* These flags select various performance enhancements.
*/
static int coda_attr_cache = 1; /* Set to cache attributes. */
static int coda_symlink_cache = 1; /* Set to cache symbolic links. */
static int coda_access_cache = 1; /* Set to cache some access checks. */
/*
* Structure to keep track of vfs calls.
*/
static struct coda_op_stats coda_vnodeopstats[CODA_VNODEOPS_SIZE];
#define MARK_ENTRY(op) (coda_vnodeopstats[op].entries++)
#define MARK_INT_SAT(op) (coda_vnodeopstats[op].sat_intrn++)
#define MARK_INT_FAIL(op) (coda_vnodeopstats[op].unsat_intrn++)
#define MARK_INT_GEN(op) (coda_vnodeopstats[op].gen_intrn++)
/*
* What we are delaying for in printf.
*/
int coda_printf_delay = 0; /* In microseconds */
int coda_vnop_print_entry = 0;
static int coda_lockdebug = 0;
/*
* Some FreeBSD details:
*
* codadev_modevent is called at boot time or module load time.
*/
#define ENTRY do { \
if (coda_vnop_print_entry) \
myprintf(("Entered %s\n", __func__)); \
} while (0)
/*
* Definition of the vnode operation vector.
*/
struct vop_vector coda_vnodeops = {
.vop_default = &default_vnodeops,
.vop_cachedlookup = coda_lookup, /* uncached lookup */
.vop_lookup = vfs_cache_lookup, /* namecache lookup */
.vop_create = coda_create, /* create */
.vop_open = coda_open, /* open */
.vop_close = coda_close, /* close */
.vop_access = coda_access, /* access */
.vop_getattr = coda_getattr, /* getattr */
.vop_setattr = coda_setattr, /* setattr */
.vop_read = coda_read, /* read */
.vop_write = coda_write, /* write */
.vop_ioctl = coda_ioctl, /* ioctl */
.vop_fsync = coda_fsync, /* fsync */
.vop_remove = coda_remove, /* remove */
.vop_link = coda_link, /* link */
.vop_rename = coda_rename, /* rename */
.vop_mkdir = coda_mkdir, /* mkdir */
.vop_rmdir = coda_rmdir, /* rmdir */
.vop_symlink = coda_symlink, /* symlink */
.vop_readdir = coda_readdir, /* readdir */
.vop_readlink = coda_readlink, /* readlink */
.vop_inactive = coda_inactive, /* inactive */
.vop_reclaim = coda_reclaim, /* reclaim */
.vop_lock1 = coda_lock, /* lock */
.vop_unlock = coda_unlock, /* unlock */
.vop_bmap = VOP_EOPNOTSUPP, /* bmap */
.vop_print = VOP_NULL, /* print */
.vop_islocked = coda_islocked, /* islocked */
.vop_pathconf = coda_pathconf, /* pathconf */
.vop_poll = vop_stdpoll,
.vop_getpages = vop_stdgetpages, /* pager intf.*/
.vop_putpages = vop_stdputpages, /* pager intf.*/
.vop_getwritemount = vop_stdgetwritemount,
#if 0
/* missing */
.vop_cachedlookup = ufs_lookup,
.vop_whiteout = ufs_whiteout,
#endif
};
static void coda_print_vattr(struct vattr *attr);
int
coda_vnodeopstats_init(void)
{
int i;
for(i=0; i<CODA_VNODEOPS_SIZE; i++) {
coda_vnodeopstats[i].opcode = i;
coda_vnodeopstats[i].entries = 0;
coda_vnodeopstats[i].sat_intrn = 0;
coda_vnodeopstats[i].unsat_intrn = 0;
coda_vnodeopstats[i].gen_intrn = 0;
}
return (0);
}
/*
* coda_open calls Venus which returns an open file descriptor the cache file
* holding the data. We get the vnode while we are still in the context of
* the venus process in coda_psdev.c. This vnode is then passed back to the
* caller and opened.
*/
int
coda_open(struct vop_open_args *ap)
{
/*
* FreeBSD can pass the O_EXCL flag in mode, even though the check
* has already happened. Venus defensively assumes that if open is
* passed the EXCL, it must be a bug. We strip the flag here.
*/
/* true args */
struct vnode **vpp = &(ap->a_vp);
struct cnode *cp = VTOC(*vpp);
int flag = ap->a_mode & (~O_EXCL);
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
struct vnode *vp;
MARK_ENTRY(CODA_OPEN_STATS);
/*
* Check for open of control file.
*/
if (IS_CTL_VP(*vpp)) {
/* XXX */
/* if (WRITEABLE(flag)) */
if (flag & (FWRITE | O_TRUNC | O_CREAT | O_EXCL)) {
MARK_INT_FAIL(CODA_OPEN_STATS);
return (EACCES);
}
MARK_INT_SAT(CODA_OPEN_STATS);
return (0);
}
error = venus_open(vtomi((*vpp)), &cp->c_fid, flag, cred,
td->td_proc, &vp);
if (error)
return (error);
CODADEBUG(CODA_OPEN, myprintf(("open: vp %p result %d\n", vp,
error)););
/*
* Save the vnode pointer for the cache file.
*/
if (cp->c_ovp == NULL) {
cp->c_ovp = vp;
} else {
if (cp->c_ovp != vp)
panic("coda_open: cp->c_ovp != ITOV(ip)");
}
cp->c_ocount++;
/*
* Flush the attribute cached if writing the file.
*/
if (flag & FWRITE) {
cp->c_owrite++;
cp->c_flags &= ~C_VATTR;
}
/*
* Open the cache file.
*/
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_OPEN(vp, flag, cred, td, NULL);
if (error) {
VOP_UNLOCK(vp, 0);
printf("coda_open: VOP_OPEN on container failed %d\n", error);
return (error);
}
(*vpp)->v_object = vp->v_object;
VOP_UNLOCK(vp, 0);
return (0);
}
/*
* Close the cache file used for I/O and notify Venus.
*/
int
coda_close(struct vop_close_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
int flag = ap->a_fflag;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
MARK_ENTRY(CODA_CLOSE_STATS);
/*
* Check for close of control file.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_CLOSE_STATS);
return (0);
}
if (cp->c_ovp) {
vn_lock(cp->c_ovp, LK_EXCLUSIVE | LK_RETRY);
/* Do errors matter here? */
VOP_CLOSE(cp->c_ovp, flag, cred, td);
vput(cp->c_ovp);
}
#ifdef CODA_VERBOSE
else
printf("coda_close: NO container vp %p/cp %p\n", vp, cp);
#endif
if (--cp->c_ocount == 0)
cp->c_ovp = NULL;
/*
* File was opened for write.
*/
if (flag & FWRITE)
--cp->c_owrite;
if (!IS_UNMOUNTING(cp))
error = venus_close(vtomi(vp), &cp->c_fid, flag, cred,
td->td_proc);
else
error = ENODEV;
CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)););
return (error);
}
int
coda_read(struct vop_read_args *ap)
{
ENTRY;
return (coda_rdwr(ap->a_vp, ap->a_uio, UIO_READ, ap->a_ioflag,
ap->a_cred, ap->a_uio->uio_td));
}
int
coda_write(struct vop_write_args *ap)
{
ENTRY;
return (coda_rdwr(ap->a_vp, ap->a_uio, UIO_WRITE, ap->a_ioflag,
ap->a_cred, ap->a_uio->uio_td));
}
int
coda_rdwr(struct vnode *vp, struct uio *uiop, enum uio_rw rw, int ioflag,
struct ucred *cred, struct thread *td)
{
/* upcall decl */
/* NOTE: container file operation!!! */
/* locals */
struct cnode *cp = VTOC(vp);
struct vnode *cfvp = cp->c_ovp;
int opened_internally = 0;
int error = 0;
MARK_ENTRY(CODA_RDWR_STATS);
CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %zd, %lld, %d)\n",
rw, (void *)uiop->uio_iov->iov_base, uiop->uio_resid,
(long long)uiop->uio_offset, uiop->uio_segflg)););
/*
* Check for rdwr of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return (EINVAL);
}
/*
* If file is not already open this must be a page {read,write}
* request and we should open it internally.
*/
if (cfvp == NULL) {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE), cred,
td, NULL);
#ifdef CODA_VERBOSE
printf("coda_rdwr: Internally Opening %p\n", vp);
#endif
if (error) {
printf("coda_rdwr: VOP_OPEN on container failed "
"%d\n", error);
return (error);
}
cfvp = cp->c_ovp;
}
/*
* Have UFS handle the call.
*/
CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = %s, refcnt = "
"%d\n", coda_f2s(&cp->c_fid), CTOV(cp)->v_usecount)););
vn_lock(cfvp, LK_EXCLUSIVE | LK_RETRY);
if (rw == UIO_READ) {
error = VOP_READ(cfvp, uiop, ioflag, cred);
} else {
error = VOP_WRITE(cfvp, uiop, ioflag, cred);
/*
* ufs_write updates the vnode_pager_setsize for the
* vnode/object.
*
* XXX: Since we now share vm objects between layers, this is
* probably unnecessary.
*/
{
struct vattr attr;
if (VOP_GETATTR(cfvp, &attr, cred) == 0)
vnode_pager_setsize(vp, attr.va_size);
}
}
VOP_UNLOCK(cfvp, 0);
if (error)
MARK_INT_FAIL(CODA_RDWR_STATS);
else
MARK_INT_SAT(CODA_RDWR_STATS);
/*
* Do an internal close if necessary.
*/
if (opened_internally) {
MARK_INT_GEN(CODA_CLOSE_STATS);
(void)VOP_CLOSE(vp, (rw == UIO_READ ? FREAD : FWRITE), cred,
td);
}
/*
* Invalidate cached attributes if writing.
*/
if (rw == UIO_WRITE)
cp->c_flags &= ~C_VATTR;
return (error);
}
int
coda_ioctl(struct vop_ioctl_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
int com = ap->a_command;
caddr_t data = ap->a_data;
int flag = ap->a_fflag;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
struct vnode *tvp;
struct nameidata ndp;
struct PioctlData *iap = (struct PioctlData *)data;
MARK_ENTRY(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("in coda_ioctl on %s\n", iap->path)););
/*
* Don't check for operation on a dying object, for ctlvp it
* shouldn't matter.
*
* Must be control object to succeed.
*/
if (!IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: vp != "
"ctlvp")););
return (EOPNOTSUPP);
}
/*
* Look up the pathname.
*
* Should we use the name cache here? It would get it from lookupname
* sooner or later anyway, right?
*/
NDINIT(&ndp, LOOKUP, (iap->follow ? FOLLOW : NOFOLLOW),
UIO_USERSPACE, iap->path, td);
error = namei(&ndp);
tvp = ndp.ni_vp;
if (error) {
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL, myprintf(("coda_ioctl error: lookup "
"returns %d\n", error)););
return (error);
}
/*
* Make sure this is a coda style cnode, but it may be a different
* vfsp.
*/
if (tvp->v_op != &coda_vnodeops) {
vrele(tvp);
NDFREE(&ndp, NDF_ONLY_PNBUF);
MARK_INT_FAIL(CODA_IOCTL_STATS);
CODADEBUG(CODA_IOCTL,
myprintf(("coda_ioctl error: %s not a coda object\n",
iap->path)););
return (EINVAL);
}
if (iap->vi.in_size > VC_MAXDATASIZE ||
iap->vi.out_size > VC_MAXDATASIZE) {
NDFREE(&ndp, 0);
return (EINVAL);
}
error = venus_ioctl(vtomi(tvp), &((VTOC(tvp))->c_fid), com, flag,
data, cred, td->td_proc);
if (error)
MARK_INT_FAIL(CODA_IOCTL_STATS);
else
CODADEBUG(CODA_IOCTL, myprintf(("Ioctl returns %d \n",
error)););
vrele(tvp);
NDFREE(&ndp, NDF_ONLY_PNBUF);
return (error);
}
/*
* To reduce the cost of a user-level venus;we cache attributes in the
* kernel. Each cnode has storage allocated for an attribute. If c_vattr is
* valid, return a reference to it. Otherwise, get the attributes from venus
* and store them in the cnode. There is some question if this method is a
* security leak. But I think that in order to make this call, the user must
* have done a lookup and opened the file, and therefore should already have
* access.
*/
int
coda_getattr(struct vop_getattr_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
/* locals */
struct vnode *convp;
int error, size;
MARK_ENTRY(CODA_GETATTR_STATS);
if (IS_UNMOUNTING(cp))
return (ENODEV);
/*
* Check for getattr of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_GETATTR_STATS);
return (ENOENT);
}
/*
* Check to see if the attributes have already been cached.
*/
if (VALID_VATTR(cp)) {
CODADEBUG(CODA_GETATTR, myprintf(("attr cache hit: %s\n",
coda_f2s(&cp->c_fid))););
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
coda_print_vattr(&cp->c_vattr););
*vap = cp->c_vattr;
MARK_INT_SAT(CODA_GETATTR_STATS);
return (0);
}
error = venus_getattr(vtomi(vp), &cp->c_fid, cred, vap);
if (!error) {
CODADEBUG(CODA_GETATTR, myprintf(("getattr miss %s: result "
"%d\n", coda_f2s(&cp->c_fid), error)););
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
coda_print_vattr(vap););
/*
* XXX: Since we now share vm objects between layers, this is
* probably unnecessary.
*/
size = vap->va_size;
convp = cp->c_ovp;
if (convp != NULL)
vnode_pager_setsize(convp, size);
/*
* If not open for write, store attributes in cnode.
*/
if ((cp->c_owrite == 0) && (coda_attr_cache)) {
cp->c_vattr = *vap;
cp->c_flags |= C_VATTR;
}
}
return (error);
}
int
coda_setattr(struct vop_setattr_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
/* locals */
struct vnode *convp;
int error, size;
MARK_ENTRY(CODA_SETATTR_STATS);
/*
* Check for setattr of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_SETATTR_STATS);
return (ENOENT);
}
if (codadebug & CODADBGMSK(CODA_SETATTR))
coda_print_vattr(vap);
error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred);
if (!error)
cp->c_flags &= ~(C_VATTR | C_ACCCACHE);
/*
* XXX: Since we now share vm objects between layers, this is
* probably unnecessary.
*
* XXX: Shouldn't we only be doing this "set" if C_VATTR remains
* valid after venus_setattr()?
*/
size = vap->va_size;
convp = cp->c_ovp;
if (size != VNOVAL && convp != NULL)
vnode_pager_setsize(convp, size);
CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)););
return (error);
}
int
coda_access(struct vop_access_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
accmode_t accmode = ap->a_accmode;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
MARK_ENTRY(CODA_ACCESS_STATS);
/*
* Check for access of control object. Only read access is allowed
* on it.
*/
if (IS_CTL_VP(vp)) {
/*
* Bogus hack - all will be marked as successes.
*/
MARK_INT_SAT(CODA_ACCESS_STATS);
return (((accmode & VREAD) && !(accmode & (VWRITE | VEXEC)))
? 0 : EACCES);
}
/*
* We maintain a one-entry LRU positive access cache with each cnode.
* In principle we could also track negative results, and for more
* than one uid, but we don't yet. Venus is responsible for
* invalidating this cache as required.
*/
if (coda_access_cache && VALID_ACCCACHE(cp) &&
(cred->cr_uid == cp->c_cached_uid) &&
(accmode & cp->c_cached_mode) == accmode) {
MARK_INT_SAT(CODA_ACCESS_STATS);
return (0);
}
error = venus_access(vtomi(vp), &cp->c_fid, accmode, cred, td->td_proc);
if (error == 0 && coda_access_cache) {
/*-
* When we have a new successful request, we consider three
* cases:
*
* - No initialized access cache, in which case cache the
* result.
* - Cached result for a different user, in which case we
* replace the entry.
* - Cached result for the same user, in which case we add
* any newly granted rights to the cached mode.
*
* XXXRW: If we ever move to something more interesting than
* uid-based token lookup, we'll need to change this.
*/
cp->c_flags |= C_ACCCACHE;
if (cp->c_cached_uid != cred->cr_uid) {
cp->c_cached_mode = accmode;
cp->c_cached_uid = cred->cr_uid;
} else
cp->c_cached_mode |= accmode;
}
return (error);
}
int
coda_readlink(struct vop_readlink_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct uio *uiop = ap->a_uio;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_uio->uio_td;
/* locals */
int error;
char *str;
int len;
MARK_ENTRY(CODA_READLINK_STATS);
/*
* Check for readlink of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_READLINK_STATS);
return (ENOENT);
}
if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) {
/*
* Symlink was cached.
*/
uiop->uio_rw = UIO_READ;
error = uiomove(cp->c_symlink, (int)cp->c_symlen, uiop);
if (error)
MARK_INT_FAIL(CODA_READLINK_STATS);
else
MARK_INT_SAT(CODA_READLINK_STATS);
return (error);
}
error = venus_readlink(vtomi(vp), &cp->c_fid, cred, td != NULL ?
td->td_proc : NULL, &str, &len);
if (!error) {
uiop->uio_rw = UIO_READ;
error = uiomove(str, len, uiop);
if (coda_symlink_cache) {
cp->c_symlink = str;
cp->c_symlen = len;
cp->c_flags |= C_SYMLINK;
} else
CODA_FREE(str, len);
}
CODADEBUG(CODA_READLINK, myprintf(("in readlink result %d\n",
error)););
return (error);
}
int
coda_fsync(struct vop_fsync_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct thread *td = ap->a_td;
/* locals */
struct vnode *convp = cp->c_ovp;
int error;
MARK_ENTRY(CODA_FSYNC_STATS);
/*
* Check for fsync on an unmounting object.
*
* XXX: Is this comment true on FreeBSD? It seems likely, since
* unmounting is fairly non-atomic.
*
* The NetBSD kernel, in it's infinite wisdom, can try to fsync after
* an unmount has been initiated. This is a Bad Thing, which we have
* to avoid. Not a legitimate failure for stats.
*/
if (IS_UNMOUNTING(cp))
return (ENODEV);
/*
* Check for fsync of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_FSYNC_STATS);
return (0);
}
if (convp != NULL) {
vn_lock(convp, LK_EXCLUSIVE | LK_RETRY);
VOP_FSYNC(convp, MNT_WAIT, td);
VOP_UNLOCK(convp, 0);
}
/*
* We see fsyncs with usecount == 1 then usecount == 0. For now we
* ignore them.
*/
#if 0
VI_LOCK(vp);
if (!vp->v_usecount) {
printf("coda_fsync on vnode %p with %d usecount. "
"c_flags = %x (%x)\n", vp, vp->v_usecount, cp->c_flags,
cp->c_flags&C_PURGING);
}
VI_UNLOCK(vp);
#endif
/*
* We can expect fsync on any vnode at all if venus is purging it.
* Venus can't very well answer the fsync request, now can it?
* Hopefully, it won't have to, because hopefully, venus preserves
* the (possibly untrue) invariant that it never purges an open
* vnode. Hopefully.
*/
if (cp->c_flags & C_PURGING)
return (0);
/* XXX: needs research */
return (0);
error = venus_fsync(vtomi(vp), &cp->c_fid, td->td_proc);
CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n", error)););
return (error);
}
int
coda_inactive(struct vop_inactive_args *ap)
{
/*
* XXX - at the moment, inactive doesn't look at cred, and doesn't
* have a proc pointer. Oops.
*/
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct ucred *cred __attribute__((unused)) = NULL;
struct thread *td __attribute__((unused)) = curthread;
/* upcall decl */
/* locals */
/*
* We don't need to send inactive to venus - DCS.
*/
MARK_ENTRY(CODA_INACTIVE_STATS);
CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %s, vfsp %p\n",
coda_f2s(&cp->c_fid), vp->v_mount)););
vp->v_object = NULL;
/*
* If an array has been allocated to hold the symlink, deallocate it.
*/
if ((coda_symlink_cache) && (VALID_SYMLINK(cp))) {
if (cp->c_symlink == NULL)
panic("coda_inactive: null symlink pointer in cnode");
CODA_FREE(cp->c_symlink, cp->c_symlen);
cp->c_flags &= ~C_SYMLINK;
cp->c_symlen = 0;
}
/*
* Remove it from the table so it can't be found.
*/
coda_unsave(cp);
if ((struct coda_mntinfo *)(vp->v_mount->mnt_data) == NULL) {
myprintf(("Help! vfsp->vfs_data was NULL, but vnode %p "
"wasn't dying\n", vp));
panic("badness in coda_inactive\n");
}
if (IS_UNMOUNTING(cp)) {
#ifdef DEBUG
printf("coda_inactive: IS_UNMOUNTING use %d: vp %p, cp %p\n",
vrefcnt(vp), vp, cp);
if (cp->c_ovp != NULL)
printf("coda_inactive: cp->ovp != NULL use %d: vp "
"%p, cp %p\n", vrefcnt(vp), vp, cp);
#endif
} else
vgone(vp);
MARK_INT_SAT(CODA_INACTIVE_STATS);
return (0);
}
/*
* Remote filesystem operations having to do with directory manipulation.
*/
/*
* In FreeBSD, lookup returns the vnode locked.
*/
int
coda_lookup(struct vop_cachedlookup_args *ap)
{
/* true args */
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct vnode **vpp = ap->a_vpp;
/*
* It looks as though ap->a_cnp->ni_cnd->cn_nameptr holds the rest of
* the string to xlate, and that we must try to get at least
* ap->a_cnp->ni_cnd->cn_namelen of those characters to macth. I
* could be wrong.
*/
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* locals */
struct cnode *cp;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct CodaFid VFid;
int vtype;
int error = 0;
MARK_ENTRY(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %s\n", nm,
coda_f2s(&dcp->c_fid))););
/*
* Check for lookup of control object.
*/
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = coda_ctlvp;
vref(*vpp);
MARK_INT_SAT(CODA_LOOKUP_STATS);
goto exit;
}
if (len+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("name too long: lookup, "
"%s (%s)\n", coda_f2s(&dcp->c_fid), nm)););
*vpp = NULL;
error = EINVAL;
goto exit;
}
error = venus_lookup(vtomi(dvp), &dcp->c_fid, nm, len, cred,
td->td_proc, &VFid, &vtype);
if (error) {
MARK_INT_FAIL(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup error on %s "
"(%s)%d\n", coda_f2s(&dcp->c_fid), nm, error)););
*vpp = NULL;
} else {
MARK_INT_SAT(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s type %o "
"result %d\n", coda_f2s(&VFid), vtype, error)););
cp = make_coda_node(&VFid, dvp->v_mount, vtype);
*vpp = CTOV(cp);
/*
* Enter the new vnode in the namecache only if the top bit
* isn't set.
*
* And don't enter a new vnode for an invalid one!
*/
if (!(vtype & CODA_NOCACHE) && (cnp->cn_flags & MAKEENTRY))
cache_enter(dvp, *vpp, cnp);
}
exit:
/*
* If we are creating, and this was the last name to be looked up,
* and the error was ENOENT, then there really shouldn't be an error
* and we can make the leaf NULL and return success. Since this is
* supposed to work under Mach as well as FreeBSD, we're leaving this
* fn wrapped. We also must tell lookup/namei that we need to save
* the last component of the name. (Create will have to free the
* name buffer later...lucky us...).
*/
if (((cnp->cn_nameiop == CREATE) || (cnp->cn_nameiop == RENAME))
&& (cnp->cn_flags & ISLASTCN) && (error == ENOENT)) {
error = EJUSTRETURN;
cnp->cn_flags |= SAVENAME;
*ap->a_vpp = NULL;
}
/*
* If we are removing, and we are at the last element, and we found
* it, then we need to keep the name around so that the removal will
* go ahead as planned. Unfortunately, this will probably also lock
* the to-be-removed vnode, which may or may not be a good idea.
* I'll have to look at the bits of coda_remove to make sure. We'll
* only save the name if we did in fact find the name, otherwise
* coda_remove won't have a chance to free the pathname.
*/
if ((cnp->cn_nameiop == DELETE) && (cnp->cn_flags & ISLASTCN)
&& !error)
cnp->cn_flags |= SAVENAME;
/*
* If the lookup went well, we need to (potentially?) unlock the
* parent, and lock the child. We are only responsible for checking
* to see if the parent is supposed to be unlocked before we return.
* We must always lock the child (provided there is one, and (the
* parent isn't locked or it isn't the same as the parent.) Simple,
* huh? We can never leave the parent locked unless we are ISLASTCN.
*/
if (!error || (error == EJUSTRETURN)) {
if (cnp->cn_flags & ISDOTDOT) {
VOP_UNLOCK(dvp, 0);
/*
* The parent is unlocked. As long as there is a
* child, lock it without bothering to check anything
* else.
*/
if (*ap->a_vpp)
vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(dvp, LK_RETRY|LK_EXCLUSIVE);
} else {
/*
* The parent is locked, and may be the same as the
* child. If different, go ahead and lock it.
*/
if (*ap->a_vpp && (*ap->a_vpp != dvp))
vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY);
}
} else {
/*
* If the lookup failed, we need to ensure that the leaf is
* NULL.
*
* Don't change any locking?
*/
*ap->a_vpp = NULL;
}
return (error);
}
/*ARGSUSED*/
int
coda_create(struct vop_create_args *ap)
{
/* true args */
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct vattr *va = ap->a_vap;
int exclusive = 1;
int mode = ap->a_vap->va_mode;
struct vnode **vpp = ap->a_vpp;
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* locals */
int error;
struct cnode *cp;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct CodaFid VFid;
struct vattr attr;
MARK_ENTRY(CODA_CREATE_STATS);
/*
* All creates are exclusive XXX.
*
* I'm assuming the 'mode' argument is the file mode bits XXX.
*
* Check for create of control object.
*/
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_CREATE_STATS);
return (EACCES);
}
error = venus_create(vtomi(dvp), &dcp->c_fid, nm, len, exclusive,
mode, va, cred, td->td_proc, &VFid, &attr);
if (!error) {
/*
* If this is an exclusive create, panic if the file already
* exists.
*
* Venus should have detected the file and reported EEXIST.
*/
if ((exclusive == 1) && (coda_find(&VFid) != NULL))
panic("cnode existed for newly created file!");
cp = make_coda_node(&VFid, dvp->v_mount, attr.va_type);
*vpp = CTOV(cp);
/*
* Update va to reflect the new attributes.
*/
(*va) = attr;
/*
* Update the attribute cache and mark it as valid.
*/
if (coda_attr_cache) {
VTOC(*vpp)->c_vattr = attr;
VTOC(*vpp)->c_flags |= C_VATTR;
}
/*
* Invalidate the parent's attr cache, the modification time
* has changed.
*/
VTOC(dvp)->c_flags &= ~C_VATTR;
cache_enter(dvp, *vpp, cnp);
CODADEBUG(CODA_CREATE, myprintf(("create: %s, result %d\n",
coda_f2s(&VFid), error)););
} else {
*vpp = (struct vnode *)0;
CODADEBUG(CODA_CREATE, myprintf(("create error %d\n",
error)););
}
if (!error) {
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, *vpp, cnp);
if (cnp->cn_flags & LOCKLEAF)
vn_lock(*ap->a_vpp, LK_EXCLUSIVE | LK_RETRY);
} else if (error == ENOENT) {
/*
* XXXRW: We only enter a negative entry if ENOENT is
* returned, not other errors. But will Venus invalidate dvp
* properly in all cases when new files appear via the
* network rather than a local operation?
*/
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, NULL, cnp);
}
return (error);
}
int
coda_remove(struct vop_remove_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct cnode *cp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
#if 0
struct cnode *tp;
#endif
MARK_ENTRY(CODA_REMOVE_STATS);
CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %s\n", nm,
coda_f2s(&cp->c_fid))););
/*
* Check for remove of control object.
*/
if (IS_CTL_NAME(dvp, nm, len)) {
MARK_INT_FAIL(CODA_REMOVE_STATS);
return (ENOENT);
}
/*
* Invalidate the parent's attr cache, the modification time has
* changed. We don't yet know if the last reference to the file is
* being removed, but we do know the reference count on the child has
* changed, so invalidate its attr cache also.
*/
VTOC(dvp)->c_flags &= ~C_VATTR;
VTOC(vp)->c_flags &= ~(C_VATTR | C_ACCCACHE);
error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred,
td->td_proc);
cache_purge(vp);
CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)););
return (error);
}
int
coda_link(struct vop_link_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vnode *tdvp = ap->a_tdvp;
struct cnode *tdcp = VTOC(tdvp);
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
MARK_ENTRY(CODA_LINK_STATS);
if (codadebug & CODADBGMSK(CODA_LINK)) {
myprintf(("nb_link: vp fid: %s\n", coda_f2s(&cp->c_fid)));
myprintf(("nb_link: tdvp fid: %s)\n",
coda_f2s(&tdcp->c_fid)));
}
if (codadebug & CODADBGMSK(CODA_LINK)) {
myprintf(("link: vp fid: %s\n", coda_f2s(&cp->c_fid)));
myprintf(("link: tdvp fid: %s\n", coda_f2s(&tdcp->c_fid)));
}
/*
* Check for link to/from control object.
*/
if (IS_CTL_NAME(tdvp, nm, len) || IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_LINK_STATS);
return (EACCES);
}
error = venus_link(vtomi(vp), &cp->c_fid, &tdcp->c_fid, nm, len,
cred, td->td_proc);
/*
* Invalidate the parent's attr cache, the modification time has
* changed.
*/
VTOC(tdvp)->c_flags &= ~C_VATTR;
VTOC(vp)->c_flags &= ~C_VATTR;
CODADEBUG(CODA_LINK, myprintf(("in link result %d\n",error)););
return (error);
}
int
coda_rename(struct vop_rename_args *ap)
{
/* true args */
struct vnode *fvp = ap->a_fvp;
struct vnode *tvp = ap->a_tvp;
struct vnode *odvp = ap->a_fdvp;
struct cnode *odcp = VTOC(odvp);
struct componentname *fcnp = ap->a_fcnp;
struct vnode *ndvp = ap->a_tdvp;
struct cnode *ndcp = VTOC(ndvp);
struct componentname *tcnp = ap->a_tcnp;
struct ucred *cred = fcnp->cn_cred;
struct thread *td = fcnp->cn_thread;
/* true args */
int error;
const char *fnm = fcnp->cn_nameptr;
int flen = fcnp->cn_namelen;
const char *tnm = tcnp->cn_nameptr;
int tlen = tcnp->cn_namelen;
MARK_ENTRY(CODA_RENAME_STATS);
/*
* Check for rename involving control object.
*/
if (IS_CTL_NAME(odvp, fnm, flen) || IS_CTL_NAME(ndvp, tnm, tlen)) {
MARK_INT_FAIL(CODA_RENAME_STATS);
return (EACCES);
}
/*
* Remove the entries for both source and target directories, which
* should catch references to the children. Perhaps we could purge
* less?
*/
cache_purge(odvp);
cache_purge(ndvp);
/*
* Invalidate parent directories as modification times have changed.
* Invalidate access cache on renamed file as rights may have
* changed.
*/
VTOC(odvp)->c_flags &= ~C_VATTR;
VTOC(ndvp)->c_flags &= ~C_VATTR;
VTOC(fvp)->c_flags &= ~C_ACCCACHE;
if (flen+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_RENAME_STATS);
error = EINVAL;
goto exit;
}
if (tlen+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_RENAME_STATS);
error = EINVAL;
goto exit;
}
error = venus_rename(vtomi(odvp), &odcp->c_fid, &ndcp->c_fid, fnm,
flen, tnm, tlen, cred, td->td_proc);
exit:
CODADEBUG(CODA_RENAME, myprintf(("in rename result %d\n",error)););
/*
* Update namecache to reflect that the names of various objects may
* have changed (or gone away entirely).
*/
cache_purge(fvp);
cache_purge(tvp);
/*
* Release parents first, then children.
*/
vrele(odvp);
if (tvp) {
if (tvp == ndvp)
vrele(ndvp);
else
vput(ndvp);
vput(tvp);
} else
vput(ndvp);
vrele(fvp);
return (error);
}
int
coda_mkdir(struct vop_mkdir_args *ap)
{
/* true args */
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
struct vattr *va = ap->a_vap;
struct vnode **vpp = ap->a_vpp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* locals */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
struct cnode *cp;
struct CodaFid VFid;
struct vattr ova;
MARK_ENTRY(CODA_MKDIR_STATS);
/*
* Check for mkdir of target object.
*/
if (IS_CTL_NAME(dvp, nm, len)) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_MKDIR_STATS);
return (EACCES);
}
if (len+1 > CODA_MAXNAMLEN) {
*vpp = (struct vnode *)0;
MARK_INT_FAIL(CODA_MKDIR_STATS);
return (EACCES);
}
error = venus_mkdir(vtomi(dvp), &dcp->c_fid, nm, len, va, cred,
td->td_proc, &VFid, &ova);
if (!error) {
if (coda_find(&VFid) != NULL)
panic("cnode existed for newly created directory!");
cp = make_coda_node(&VFid, dvp->v_mount, va->va_type);
*vpp = CTOV(cp);
/*
* Enter the new vnode in the Name Cache.
*/
if (cnp->cn_flags & MAKEENTRY)
cache_enter(dvp, *vpp, cnp);
/*
* Update the attr cache and mark as valid.
*/
if (coda_attr_cache) {
VTOC(*vpp)->c_vattr = ova;
VTOC(*vpp)->c_flags |= C_VATTR;
}
/*
* Invalidate the parent's attr cache, the modification time
* has changed.
*/
VTOC(dvp)->c_flags &= ~C_VATTR;
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY);
CODADEBUG( CODA_MKDIR, myprintf(("mkdir: %s result %d\n",
coda_f2s(&VFid), error)););
} else {
*vpp = NULL;
CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error)););
}
return (error);
}
int
coda_rmdir(struct vop_rmdir_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
/* true args */
int error;
const char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
#if 0
struct cnode *cp;
#endif
MARK_ENTRY(CODA_RMDIR_STATS);
/*
* Check for rmdir of control object.
*/
if (IS_CTL_NAME(dvp, nm, len)) {
MARK_INT_FAIL(CODA_RMDIR_STATS);
return (ENOENT);
}
/*
* Possibly somewhat conservative purging, perhaps we just need to
* purge vp?
*/
cache_purge(dvp);
cache_purge(vp);
/*
* Invalidate the parent's attr cache, the modification time has
* changed.
*/
dcp->c_flags &= ~C_VATTR;
error = venus_rmdir(vtomi(dvp), &dcp->c_fid, nm, len, cred,
td->td_proc);
CODADEBUG(CODA_RMDIR, myprintf(("in rmdir result %d\n", error)););
return (error);
}
int
coda_symlink(struct vop_symlink_args *ap)
{
/* true args */
struct vnode *tdvp = ap->a_dvp;
struct cnode *tdcp = VTOC(tdvp);
struct componentname *cnp = ap->a_cnp;
struct vattr *tva = ap->a_vap;
char *path = ap->a_target;
struct ucred *cred = cnp->cn_cred;
struct thread *td = cnp->cn_thread;
struct vnode **vpp = ap->a_vpp;
/* locals */
int error;
/*-
* XXX I'm assuming the following things about coda_symlink's
* arguments:
* t(foo) is the new name/parent/etc being created.
* lname is the contents of the new symlink.
*/
char *nm = cnp->cn_nameptr;
int len = cnp->cn_namelen;
int plen = strlen(path);
/*
* Here's the strategy for the moment: perform the symlink, then do a
* lookup to grab the resulting vnode. I know this requires two
* communications with Venus for a new sybolic link, but that's the
* way the ball bounces. I don't yet want to change the way the Mach
* symlink works. When Mach support is deprecated, we should change
* symlink so that the common case returns the resultant vnode in a
* vpp argument.
*/
MARK_ENTRY(CODA_SYMLINK_STATS);
/*
* Check for symlink of control object.
*/
if (IS_CTL_NAME(tdvp, nm, len)) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
return (EACCES);
}
if (plen+1 > CODA_MAXPATHLEN) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
return (EINVAL);
}
if (len+1 > CODA_MAXNAMLEN) {
MARK_INT_FAIL(CODA_SYMLINK_STATS);
error = EINVAL;
goto exit;
}
error = venus_symlink(vtomi(tdvp), &tdcp->c_fid, path, plen, nm, len,
tva, cred, td->td_proc);
/*
* Invalidate the parent's attr cache, the modification time has
* changed.
*/
tdcp->c_flags &= ~C_VATTR;
if (error == 0)
error = VOP_LOOKUP(tdvp, vpp, cnp);
exit:
CODADEBUG(CODA_SYMLINK, myprintf(("in symlink result %d\n",error)););
return (error);
}
/*
* Read directory entries.
*
* XXX: This forwards the operator straight to the cache vnode using
* VOP_READDIR(), rather than calling venus_readdir(). Why?
*/
int
coda_readdir(struct vop_readdir_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct uio *uiop = ap->a_uio;
struct ucred *cred = ap->a_cred;
int *eofflag = ap->a_eofflag;
u_long **cookies = ap->a_cookies;
int *ncookies = ap->a_ncookies;
struct thread *td = ap->a_uio->uio_td;
/* upcall decl */
/* locals */
int error = 0;
int opened_internally = 0;
MARK_ENTRY(CODA_READDIR_STATS);
CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %zd, %lld, %d)\n",
(void *)uiop->uio_iov->iov_base, uiop->uio_resid,
(long long)uiop->uio_offset, uiop->uio_segflg)););
/*
* Check for readdir of control object.
*/
if (IS_CTL_VP(vp)) {
MARK_INT_FAIL(CODA_READDIR_STATS);
return (ENOENT);
}
/*
* If directory is not already open do an "internal open" on it.
*
* XXX: Why would this happen? For files, there's memory mapping,
* execution, and other kernel access paths such as ktrace. For
* directories, it is less clear.
*/
if (cp->c_ovp == NULL) {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, FREAD, cred, td, NULL);
printf("coda_readdir: Internally Opening %p\n", vp);
if (error) {
printf("coda_readdir: VOP_OPEN on container failed "
"%d\n", error);
return (error);
}
}
/*
* Have UFS handle the call.
*/
CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = %s, "
"refcnt = %d\n", coda_f2s(&cp->c_fid), vp->v_usecount)););
vn_lock(cp->c_ovp, LK_SHARED | LK_RETRY);
error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, ncookies,
cookies);
VOP_UNLOCK(cp->c_ovp, 0);
if (error)
MARK_INT_FAIL(CODA_READDIR_STATS);
else
MARK_INT_SAT(CODA_READDIR_STATS);
/*
* Do an "internal close" if necessary.
*/
if (opened_internally) {
MARK_INT_GEN(CODA_CLOSE_STATS);
(void)VOP_CLOSE(vp, FREAD, cred, td);
}
return (error);
}
int
coda_reclaim(struct vop_reclaim_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
/*
* Forced unmount/flush will let vnodes with non-zero use be
* destroyed!
*/
ENTRY;
if (IS_UNMOUNTING(cp)) {
#ifdef DEBUG
if (VTOC(vp)->c_ovp) {
if (IS_UNMOUNTING(cp))
printf("coda_reclaim: c_ovp not void: vp "
"%p, cp %p\n", vp, cp);
}
#endif
}
cache_purge(vp);
coda_free(VTOC(vp));
vp->v_data = NULL;
vp->v_object = NULL;
return (0);
}
int
coda_lock(struct vop_lock1_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
ENTRY;
if ((ap->a_flags & LK_INTERLOCK) == 0) {
VI_LOCK(vp);
ap->a_flags |= LK_INTERLOCK;
}
if (coda_lockdebug)
myprintf(("Attempting lock on %s\n", coda_f2s(&cp->c_fid)));
return (vop_stdlock(ap));
}
int
coda_unlock(struct vop_unlock_args *ap)
{
/* true args */
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
/* upcall decl */
/* locals */
ENTRY;
if (coda_lockdebug)
myprintf(("Attempting unlock on %s\n",
coda_f2s(&cp->c_fid)));
return (vop_stdunlock(ap));
}
int
coda_islocked(struct vop_islocked_args *ap)
{
/* true args */
ENTRY;
return (vop_stdislocked(ap));
}
static void
coda_print_vattr(struct vattr *attr)
{
char *typestr;
switch (attr->va_type) {
case VNON:
typestr = "VNON";
break;
case VREG:
typestr = "VREG";
break;
case VDIR:
typestr = "VDIR";
break;
case VBLK:
typestr = "VBLK";
break;
case VCHR:
typestr = "VCHR";
break;
case VLNK:
typestr = "VLNK";
break;
case VSOCK:
typestr = "VSCK";
break;
case VFIFO:
typestr = "VFFO";
break;
case VBAD:
typestr = "VBAD";
break;
default:
typestr = "????";
break;
}
myprintf(("attr: type %s mode %d uid %d gid %d fsid %d rdev %d\n",
typestr, (int)attr->va_mode, (int)attr->va_uid,
(int)attr->va_gid, (int)attr->va_fsid, (int)attr->va_rdev));
myprintf((" fileid %d nlink %d size %d blocksize %d bytes %d\n",
(int)attr->va_fileid, (int)attr->va_nlink, (int)attr->va_size,
(int)attr->va_blocksize,(int)attr->va_bytes));
myprintf((" gen %ld flags %ld vaflags %d\n", attr->va_gen,
attr->va_flags, attr->va_vaflags));
myprintf((" atime sec %d nsec %d\n", (int)attr->va_atime.tv_sec,
(int)attr->va_atime.tv_nsec));
myprintf((" mtime sec %d nsec %d\n", (int)attr->va_mtime.tv_sec,
(int)attr->va_mtime.tv_nsec));
myprintf((" ctime sec %d nsec %d\n", (int)attr->va_ctime.tv_sec,
(int)attr->va_ctime.tv_nsec));
}
/*
* How to print a ucred.
*/
void
coda_print_cred(struct ucred *cred)
{
int i;
myprintf(("ref %d\tuid %d\n",cred->cr_ref,cred->cr_uid));
for (i=0; i < cred->cr_ngroups; i++)
myprintf(("\tgroup %d: (%d)\n",i,cred->cr_groups[i]));
myprintf(("\n"));
}
/*
* Return a vnode for the given fid. If no cnode exists for this fid create
* one and put it in a table hashed by coda_f2i(). If the cnode for this fid
* is already in the table return it (ref count is incremented by coda_find.
* The cnode will be flushed from the table when coda_inactive calls
* coda_unsave.
*/
struct cnode *
make_coda_node(struct CodaFid *fid, struct mount *vfsp, short type)
{
struct cnode *cp;
struct vnode *vp;
int err;
/*
* XXXRW: This really needs a moderate amount of reworking. We need
* to properly tolerate failures of getnewvnode() and insmntque(),
* and callers need to be able to accept an error back from
* make_coda_node. There may also be more general issues in how we
* handle forced unmount. Finally, if/when Coda loses its dependency
* on Giant, the ordering of this needs rethinking.
*/
cp = coda_find(fid);
if (cp != NULL) {
vref(CTOV(cp));
return (cp);
}
cp = coda_alloc();
cp->c_fid = *fid;
err = getnewvnode("coda", vfsp, &coda_vnodeops, &vp);
if (err)
panic("coda: getnewvnode returned error %d\n", err);
vp->v_data = cp;
vp->v_type = type;
cp->c_vnode = vp;
coda_save(cp);
err = insmntque(vp, vfsp);
if (err != 0)
printf("coda: insmntque failed: error %d", err);
return (cp);
}
int
coda_pathconf(struct vop_pathconf_args *ap)
{
switch (ap->a_name) {
case _PC_NAME_MAX:
*ap->a_retval = CODA_MAXNAMLEN;
return (0);
case _PC_PATH_MAX:
*ap->a_retval = CODA_MAXPATHLEN;
return (0);
default:
return (vop_stdpathconf(ap));
}
}