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freebsd-nq/sys/coda/coda_vnops.c
Kirk McKusick a0595d0249 Add a flags parameter to VFS_VGET to pass through the desired 
locking flags when acquiring a vnode. The immediate purpose is
to allow polling lock requests (LK_NOWAIT) needed by soft updates
to avoid deadlock when enlisting other processes to help with
the background cleanup. For the future it will allow the use of
shared locks for read access to vnodes. This change touches a
lot of files as it affects most filesystems within the system.
It has been well tested on FFS, loopback, and CD-ROM filesystems.
only lightly on the others, so if you find a problem there, please
let me (mckusick@mckusick.com) know.
2002-03-17 01:25:47 +00:00

1977 lines
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/*
*
* 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 $
* $FreeBSD$
*
*/
/*
* 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 file system at Carnegie Mellon
* University. Contributers include David Steere, James Kistler, and
* M. Satyanarayanan.
*/
#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 <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <coda/coda.h>
#include <coda/cnode.h>
#include <coda/coda_vnops.h>
#include <coda/coda_venus.h>
#include <coda/coda_opstats.h>
#include <coda/coda_subr.h>
#include <coda/coda_namecache.h>
#include <coda/coda_pioctl.h>
/*
* These flags select various performance enhancements.
*/
int coda_attr_cache = 1; /* Set to cache attributes in the kernel */
int coda_symlink_cache = 1; /* Set to cache symbolic link information */
int coda_access_cache = 1; /* Set to handle some access checks directly */
/* structure to keep track of vfs calls */
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;
/* Definition of the vfs operation vector */
static int (**coda_vnodeop_p)(void *);
/*
* Some NetBSD details:
*
* coda_start is called at the end of the mount syscall.
* coda_init is called at boot time.
*/
#define ENTRY if(coda_vnop_print_entry) myprintf(("Entered %s\n",__func__))
/* Definition of the vnode operation vector */
struct vnodeopv_entry_desc coda_vnodeop_entries[] = {
{ &vop_default_desc, coda_vop_error },
{ &vop_lookup_desc, coda_lookup }, /* lookup */
{ &vop_create_desc, coda_create }, /* create */
{ &vop_mknod_desc, coda_vop_error }, /* mknod */
{ &vop_open_desc, coda_open }, /* open */
{ &vop_close_desc, coda_close }, /* close */
{ &vop_access_desc, coda_access }, /* access */
{ &vop_getattr_desc, coda_getattr }, /* getattr */
{ &vop_setattr_desc, coda_setattr }, /* setattr */
{ &vop_read_desc, coda_read }, /* read */
{ &vop_write_desc, coda_write }, /* write */
{ &vop_ioctl_desc, coda_ioctl }, /* ioctl */
{ &vop_fsync_desc, coda_fsync }, /* fsync */
{ &vop_remove_desc, coda_remove }, /* remove */
{ &vop_link_desc, coda_link }, /* link */
{ &vop_rename_desc, coda_rename }, /* rename */
{ &vop_mkdir_desc, coda_mkdir }, /* mkdir */
{ &vop_rmdir_desc, coda_rmdir }, /* rmdir */
{ &vop_symlink_desc, coda_symlink }, /* symlink */
{ &vop_readdir_desc, coda_readdir }, /* readdir */
{ &vop_readlink_desc, coda_readlink }, /* readlink */
{ &vop_inactive_desc, coda_inactive }, /* inactive */
{ &vop_reclaim_desc, coda_reclaim }, /* reclaim */
{ &vop_lock_desc, coda_lock }, /* lock */
{ &vop_unlock_desc, coda_unlock }, /* unlock */
{ &vop_bmap_desc, coda_bmap }, /* bmap */
{ &vop_strategy_desc, coda_strategy }, /* strategy */
{ &vop_print_desc, coda_vop_error }, /* print */
{ &vop_islocked_desc, coda_islocked }, /* islocked */
{ &vop_pathconf_desc, coda_vop_error }, /* pathconf */
{ &vop_advlock_desc, coda_vop_nop }, /* advlock */
{ &vop_lease_desc, coda_vop_nop }, /* lease */
{ &vop_poll_desc, (vop_t *) vop_stdpoll },
{ &vop_getpages_desc, (vop_t*)vop_stdgetpages }, /* pager intf.*/
{ &vop_putpages_desc, (vop_t*)vop_stdputpages }, /* pager intf.*/
{ &vop_createvobject_desc, (vop_t*)vop_stdcreatevobject },
{ &vop_destroyvobject_desc, (vop_t*)vop_stddestroyvobject },
{ &vop_getvobject_desc, (vop_t*)vop_stdgetvobject },
#if 0
we need to define these someday
#define UFS_BLKATOFF(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_blkatoff(aa, bb, cc, dd)
#define UFS_VALLOC(aa, bb, cc, dd) VFSTOUFS((aa)->v_mount)->um_valloc(aa, bb, cc, dd)
#define UFS_VFREE(aa, bb, cc) VFSTOUFS((aa)->v_mount)->um_vfree(aa, bb, cc)
#define UFS_TRUNCATE(aa, bb, cc, dd, ee) VFSTOUFS((aa)->v_mount)->um_truncate(aa, bb, cc, dd, ee)
#define UFS_UPDATE(aa, bb) VFSTOUFS((aa)->v_mount)->um_update(aa, bb)
missing
{ &vop_reallocblks_desc, (vop_t *) ufs_missingop },
{ &vop_cachedlookup_desc, (vop_t *) ufs_lookup },
{ &vop_whiteout_desc, (vop_t *) ufs_whiteout },
#endif
{ &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject },
{ &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject },
{ &vop_getvobject_desc, (vop_t *) vop_stdgetvobject },
{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
{ (struct vnodeop_desc*)NULL, (int(*)(void *))NULL }
};
static struct vnodeopv_desc coda_vnodeop_opv_desc =
{ &coda_vnodeop_p, coda_vnodeop_entries };
VNODEOP_SET(coda_vnodeop_opv_desc);
/* A generic panic: we were called with something we didn't define yet */
int
coda_vop_error(void *anon) {
struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
myprintf(("coda_vop_error: Vnode operation %s called, but not defined.\n",
(*desc)->vdesc_name));
/*
panic("coda_vop_error");
*/
return EIO;
}
/* A generic do-nothing. For lease_check, advlock */
int
coda_vop_nop(void *anon) {
struct vnodeop_desc **desc = (struct vnodeop_desc **)anon;
if (codadebug) {
myprintf(("Vnode operation %s called, but unsupported\n",
(*desc)->vdesc_name));
}
return (0);
}
int
coda_vnodeopstats_init(void)
{
register 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 to return the device, inode pair of the cache
* file holding the data. Using iget, coda_open finds the vnode of the
* cache file, and then opens it.
*/
int
coda_open(v)
void *v;
{
/*
* NetBSD 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 vop_open_args *ap = v;
register 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;
dev_t dev;
ino_t inode;
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, &dev, &inode);
if (error)
return (error);
if (!error) {
CODADEBUG( CODA_OPEN,myprintf(("open: dev %#lx inode %lu result %d\n",
(u_long)dev2udev(dev), (u_long)inode,
error)); )
}
/* Translate the <device, inode> pair for the cache file into
an inode pointer. */
error = coda_grab_vnode(dev, inode, &vp);
if (error)
return (error);
/* We get the vnode back locked. Needs unlocked */
VOP_UNLOCK(vp, 0, td);
/* Keep a reference until the close comes in. */
vref(*vpp);
/* 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;
}
/* Save the <device, inode> pair for the cache file to speed
up subsequent page_read's. */
cp->c_device = dev;
cp->c_inode = inode;
/* Open the cache file. */
error = VOP_OPEN(vp, flag, cred, td);
if (error) {
printf("coda_open: VOP_OPEN on container failed %d\n", error);
return (error);
}
/* grab (above) does this when it calls newvnode unless it's in the cache*/
if (vp->v_type == VREG) {
error = vfs_object_create(vp, td, cred);
if (error != 0) {
printf("coda_open: vfs_object_create() returns %d\n", error);
vput(vp);
}
}
return(error);
}
/*
* Close the cache file used for I/O and notify Venus.
*/
int
coda_close(v)
void *v;
{
/* true args */
struct vop_close_args *ap = v;
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 (IS_UNMOUNTING(cp)) {
if (cp->c_ovp) {
#ifdef CODA_VERBOSE
printf("coda_close: destroying container ref %d, ufs vp %p of vp %p/cp %p\n",
vp->v_usecount, cp->c_ovp, vp, cp);
#endif
#ifdef hmm
vgone(cp->c_ovp);
#else
VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
vrele(cp->c_ovp);
#endif
} else {
#ifdef CODA_VERBOSE
printf("coda_close: NO container vp %p/cp %p\n", vp, cp);
#endif
}
return ENODEV;
} else {
VOP_CLOSE(cp->c_ovp, flag, cred, td); /* Do errors matter here? */
vrele(cp->c_ovp);
}
if (--cp->c_ocount == 0)
cp->c_ovp = NULL;
if (flag & FWRITE) /* file was opened for write */
--cp->c_owrite;
error = venus_close(vtomi(vp), &cp->c_fid, flag, cred, td->td_proc);
vrele(CTOV(cp));
CODADEBUG(CODA_CLOSE, myprintf(("close: result %d\n",error)); )
return(error);
}
int
coda_read(v)
void *v;
{
struct vop_read_args *ap = v;
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(v)
void *v;
{
struct vop_write_args *ap = v;
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(vp, uiop, rw, ioflag, cred, td)
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;
struct proc *p = td->td_proc;
struct thread *ltd = td;
int igot_internally = 0;
int opened_internally = 0;
int error = 0;
int iscore = 0;
MARK_ENTRY(CODA_RDWR_STATS);
CODADEBUG(CODA_RDWR, myprintf(("coda_rdwr(%d, %p, %d, %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. Iget the cache file's inode
* pointer if we still have its <device, inode> pair.
* Otherwise, we must do an internal open to derive the
* pair.
*/
if (cfvp == NULL) {
/*
* If we're dumping core, do the internal open. Otherwise
* venus won't have the correct size of the core when
* it's completely written.
*/
if (p) {
PROC_LOCK(p);
iscore = (p->p_acflag & ACORE);
PROC_UNLOCK(p);
}
else
ltd = curthread;
if (cp->c_inode != 0 && !iscore) {
igot_internally = 1;
error = coda_grab_vnode(cp->c_device, cp->c_inode, &cfvp);
if (error) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return(error);
}
/*
* We get the vnode back locked by curthread in both Mach and
* NetBSD. Needs unlocked
*/
VOP_UNLOCK(cfvp, 0, ltd);
}
else {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, (rw == UIO_READ ? FREAD : FWRITE),
cred, td);
printf("coda_rdwr: Internally Opening %p\n", vp);
if (error) {
printf("coda_rdwr: VOP_OPEN on container failed %d\n", error);
return (error);
}
if (vp->v_type == VREG) {
error = vfs_object_create(vp, td, cred);
if (error != 0) {
printf("coda_rdwr: vfs_object_create() returns %d\n", error);
vput(vp);
}
}
if (error) {
MARK_INT_FAIL(CODA_RDWR_STATS);
return(error);
}
cfvp = cp->c_ovp;
}
}
/* Have UFS handle the call. */
CODADEBUG(CODA_RDWR, myprintf(("indirect rdwr: fid = (%lx.%lx.%lx), refcnt = %d\n",
cp->c_fid.Volume, cp->c_fid.Vnode,
cp->c_fid.Unique, CTOV(cp)->v_usecount)); )
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 */
{ struct vattr attr;
if (VOP_GETATTR(cfvp, &attr, cred, td) == 0) {
vnode_pager_setsize(vp, attr.va_size);
}
}
}
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(v)
void *v;
{
/* true args */
struct vop_ioctl_args *ap = v;
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_vnodeop_p) {
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) {
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(v)
void *v;
{
/* true args */
struct vop_getattr_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
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: (%lx.%lx.%lx)\n",
cp->c_fid.Volume,
cp->c_fid.Vnode,
cp->c_fid.Unique));});
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
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, td->td_proc, vap);
if (!error) {
CODADEBUG(CODA_GETATTR, myprintf(("getattr miss (%lx.%lx.%lx): result %d\n",
cp->c_fid.Volume,
cp->c_fid.Vnode,
cp->c_fid.Unique,
error)); )
CODADEBUG(CODA_GETATTR, if (!(codadebug & ~CODA_GETATTR))
print_vattr(vap); );
{ int size = vap->va_size;
struct vnode *convp = cp->c_ovp;
if (convp != (struct vnode *)0) {
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(v)
void *v;
{
/* true args */
struct vop_setattr_args *ap = v;
register struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
register struct vattr *vap = ap->a_vap;
struct ucred *cred = ap->a_cred;
struct thread *td = ap->a_td;
/* locals */
int error;
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)) {
print_vattr(vap);
}
error = venus_setattr(vtomi(vp), &cp->c_fid, vap, cred, td->td_proc);
if (!error)
cp->c_flags &= ~C_VATTR;
{ int size = vap->va_size;
struct vnode *convp = cp->c_ovp;
if (size != VNOVAL && convp != (struct vnode *)0) {
vnode_pager_setsize(convp, size);
}
}
CODADEBUG(CODA_SETATTR, myprintf(("setattr %d\n", error)); )
return(error);
}
int
coda_access(v)
void *v;
{
/* true args */
struct vop_access_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
int mode = ap->a_mode;
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(((mode & VREAD) && !(mode & (VWRITE | VEXEC)))
? 0 : EACCES);
}
/*
* if the file is a directory, and we are checking exec (eg lookup)
* access, and the file is in the namecache, then the user must have
* lookup access to it.
*/
if (coda_access_cache) {
if ((vp->v_type == VDIR) && (mode & VEXEC)) {
if (coda_nc_lookup(cp, ".", 1, cred)) {
MARK_INT_SAT(CODA_ACCESS_STATS);
return(0); /* it was in the cache */
}
}
}
error = venus_access(vtomi(vp), &cp->c_fid, mode, cred, td->td_proc);
return(error);
}
int
coda_readlink(v)
void *v;
{
/* true args */
struct vop_readlink_args *ap = v;
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->td_proc, &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(v)
void *v;
{
/* true args */
struct vop_fsync_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct ucred *cred = ap->a_cred;
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 */
/* 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)
VOP_FSYNC(convp, cred, MNT_WAIT, td);
/*
* We see fsyncs with usecount == 1 then usecount == 0.
* For now we ignore them.
*/
/*
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);
}
*/
/*
* We can expect fsync on any vnode at all if venus is pruging 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);
}
/* needs research */
return 0;
error = venus_fsync(vtomi(vp), &cp->c_fid, cred, td->td_proc);
CODADEBUG(CODA_FSYNC, myprintf(("in fsync result %d\n",error)); );
return(error);
}
int
coda_inactive(v)
void *v;
{
/* XXX - at the moment, inactive doesn't look at cred, and doesn't
have a proc pointer. Oops. */
/* true args */
struct vop_inactive_args *ap = v;
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);
if (IS_CTL_VP(vp)) {
MARK_INT_SAT(CODA_INACTIVE_STATS);
return 0;
}
CODADEBUG(CODA_INACTIVE, myprintf(("in inactive, %lx.%lx.%lx. vfsp %p\n",
cp->c_fid.Volume, cp->c_fid.Vnode,
cp->c_fid.Unique, vp->v_mount));)
/* 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", vp->v_usecount, vp, cp);
if (cp->c_ovp != NULL)
printf("coda_inactive: cp->ovp != NULL use %d: vp %p, cp %p\n",
vp->v_usecount, vp, cp);
#endif
lockmgr(&cp->c_lock, LK_RELEASE, &vp->v_interlock, td);
} else {
#ifdef OLD_DIAGNOSTIC
if (CTOV(cp)->v_usecount) {
panic("coda_inactive: nonzero reference count");
}
if (cp->c_ovp != NULL) {
panic("coda_inactive: cp->ovp != NULL");
}
#endif
VOP_UNLOCK(vp, 0, td);
vgone(vp);
}
MARK_INT_SAT(CODA_INACTIVE_STATS);
return(0);
}
/*
* Remote file system operations having to do with directory manipulation.
*/
/*
* It appears that in NetBSD, lookup is supposed to return the vnode locked
*/
int
coda_lookup(v)
void *v;
{
/* true args */
struct vop_lookup_args *ap = v;
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;
ViceFid VFid;
int vtype;
int error = 0;
MARK_ENTRY(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP, myprintf(("lookup: %s in %lx.%lx.%lx\n",
nm, dcp->c_fid.Volume,
dcp->c_fid.Vnode, dcp->c_fid.Unique)););
/* 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, %lx.%lx.%lx(%s)\n",
dcp->c_fid.Volume, dcp->c_fid.Vnode,
dcp->c_fid.Unique, nm)););
*vpp = (struct vnode *)0;
error = EINVAL;
goto exit;
}
/* First try to look the file up in the cfs name cache */
/* lock the parent vnode? */
cp = coda_nc_lookup(dcp, nm, len, cred);
if (cp) {
*vpp = CTOV(cp);
vref(*vpp);
CODADEBUG(CODA_LOOKUP,
myprintf(("lookup result %d vpp %p\n",error,*vpp));)
} else {
/* The name wasn't cached, so we need to contact Venus */
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 %lx.%lx.%lx(%s)%d\n",
dcp->c_fid.Volume, dcp->c_fid.Vnode, dcp->c_fid.Unique, nm, error));)
*vpp = (struct vnode *)0;
} else {
MARK_INT_SAT(CODA_LOOKUP_STATS);
CODADEBUG(CODA_LOOKUP,
myprintf(("lookup: vol %lx vno %lx uni %lx type %o result %d\n",
VFid.Volume, VFid.Vnode, VFid.Unique, vtype,
error)); )
cp = make_coda_node(&VFid, dvp->v_mount, vtype);
*vpp = CTOV(cp);
/* enter the new vnode in the Name Cache only if the top bit isn't set */
/* And don't enter a new vnode for an invalid one! */
if (!(vtype & CODA_NOCACHE))
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
}
}
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 NetBSD, 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 & LOCKPARENT) || !(cnp->cn_flags & ISLASTCN)) {
if ((error = VOP_UNLOCK(dvp, 0, td))) {
return error;
}
/*
* The parent is unlocked. As long as there is a child,
* lock it without bothering to check anything else.
*/
if (*ap->a_vpp) {
if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
printf("coda_lookup: ");
panic("unlocked parent but couldn't lock child");
}
}
} else {
/* The parent is locked, and may be the same as the child */
if (*ap->a_vpp && (*ap->a_vpp != dvp)) {
/* Different, go ahead and lock it. */
if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
printf("coda_lookup: ");
panic("unlocked parent but couldn't lock child");
}
}
}
} 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(v)
void *v;
{
/* true args */
struct vop_create_args *ap = v;
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;
ViceFid 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;
/* enter the new vnode in the Name Cache */
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
CODADEBUG(CODA_CREATE,
myprintf(("create: (%lx.%lx.%lx), result %d\n",
VFid.Volume, VFid.Vnode, VFid.Unique, error)); )
} else {
*vpp = (struct vnode *)0;
CODADEBUG(CODA_CREATE, myprintf(("create error %d\n", error));)
}
if (!error) {
if (cnp->cn_flags & LOCKLEAF) {
if ((error = VOP_LOCK(*ap->a_vpp, LK_EXCLUSIVE, td))) {
printf("coda_create: ");
panic("unlocked parent but couldn't lock child");
}
}
#ifdef OLD_DIAGNOSTIC
else {
printf("coda_create: LOCKLEAF not set!\n");
}
#endif
}
return(error);
}
int
coda_remove(v)
void *v;
{
/* true args */
struct vop_remove_args *ap = v;
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;
struct cnode *tp;
MARK_ENTRY(CODA_REMOVE_STATS);
CODADEBUG(CODA_REMOVE, myprintf(("remove: %s in %lx.%lx.%lx\n",
nm, cp->c_fid.Volume, cp->c_fid.Vnode,
cp->c_fid.Unique)););
/* Remove the file's entry from the CODA Name Cache */
/* We're being conservative here, it might be that this person
* doesn't really have sufficient access to delete the file
* but we feel zapping the entry won't really hurt anyone -- dcs
*/
/* I'm gonna go out on a limb here. If a file and a hardlink to it
* exist, and one is removed, the link count on the other will be
* off by 1. We could either invalidate the attrs if cached, or
* fix them. I'll try to fix them. DCS 11/8/94
*/
tp = coda_nc_lookup(VTOC(dvp), nm, len, cred);
if (tp) {
if (VALID_VATTR(tp)) { /* If attrs are cached */
if (tp->c_vattr.va_nlink > 1) { /* If it's a hard link */
tp->c_vattr.va_nlink--;
}
}
coda_nc_zapfile(VTOC(dvp), nm, len);
/* No need to flush it if it doesn't exist! */
}
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(dvp)->c_flags &= ~C_VATTR;
/* Check for remove of control object. */
if (IS_CTL_NAME(dvp, nm, len)) {
MARK_INT_FAIL(CODA_REMOVE_STATS);
return(ENOENT);
}
error = venus_remove(vtomi(dvp), &cp->c_fid, nm, len, cred, td->td_proc);
CODADEBUG(CODA_REMOVE, myprintf(("in remove result %d\n",error)); )
return(error);
}
int
coda_link(v)
void *v;
{
/* true args */
struct vop_link_args *ap = v;
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: (%lx.%lx.%lx)\n",
cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));
myprintf(("nb_link: tdvp fid: (%lx.%lx.%lx)\n",
tdcp->c_fid.Volume, tdcp->c_fid.Vnode, tdcp->c_fid.Unique));
}
if (codadebug & CODADBGMSK(CODA_LINK)) {
myprintf(("link: vp fid: (%lx.%lx.%lx)\n",
cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));
myprintf(("link: tdvp fid: (%lx.%lx.%lx)\n",
tdcp->c_fid.Volume, tdcp->c_fid.Vnode, tdcp->c_fid.Unique));
}
/* 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(v)
void *v;
{
/* true args */
struct vop_rename_args *ap = v;
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);
/* Hmmm. The vnodes are already looked up. Perhaps they are locked?
This could be Bad. XXX */
#ifdef OLD_DIAGNOSTIC
if ((fcnp->cn_cred != tcnp->cn_cred)
|| (fcnp->cn_thread != tcnp->cn_thread))
{
panic("coda_rename: component names don't agree");
}
#endif
/* 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);
}
/* Problem with moving directories -- need to flush entry for .. */
if (odvp != ndvp) {
struct cnode *ovcp = coda_nc_lookup(VTOC(odvp), fnm, flen, cred);
if (ovcp) {
struct vnode *ovp = CTOV(ovcp);
if ((ovp) &&
(ovp->v_type == VDIR)) /* If it's a directory */
coda_nc_zapfile(VTOC(ovp),"..", 2);
}
}
/* Remove the entries for both source and target files */
coda_nc_zapfile(VTOC(odvp), fnm, flen);
coda_nc_zapfile(VTOC(ndvp), tnm, tlen);
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(odvp)->c_flags &= ~C_VATTR;
VTOC(ndvp)->c_flags &= ~C_VATTR;
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));)
/* XXX - do we need to call cache pureg on the moved vnode? */
cache_purge(ap->a_fvp);
/* It seems to be incumbent on us to drop locks on all four vnodes */
/* From-vnodes are not locked, only ref'd. To-vnodes are locked. */
vrele(ap->a_fvp);
vrele(odvp);
if (ap->a_tvp) {
if (ap->a_tvp == ndvp) {
vrele(ap->a_tvp);
} else {
vput(ap->a_tvp);
}
}
vput(ndvp);
return(error);
}
int
coda_mkdir(v)
void *v;
{
/* true args */
struct vop_mkdir_args *ap = v;
struct vnode *dvp = ap->a_dvp;
struct cnode *dcp = VTOC(dvp);
struct componentname *cnp = ap->a_cnp;
register 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;
ViceFid 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 */
coda_nc_enter(VTOC(dvp), nm, len, cred, VTOC(*vpp));
/* as a side effect, enter "." and ".." for the directory */
coda_nc_enter(VTOC(*vpp), ".", 1, cred, VTOC(*vpp));
coda_nc_enter(VTOC(*vpp), "..", 2, cred, VTOC(dvp));
if (coda_attr_cache) {
VTOC(*vpp)->c_vattr = ova; /* update the attr cache */
VTOC(*vpp)->c_flags |= C_VATTR; /* Valid attributes in cnode */
}
/* Invalidate the parent's attr cache, the modification time has changed */
VTOC(dvp)->c_flags &= ~C_VATTR;
CODADEBUG( CODA_MKDIR, myprintf(("mkdir: (%lx.%lx.%lx) result %d\n",
VFid.Volume, VFid.Vnode, VFid.Unique, error)); )
} else {
*vpp = (struct vnode *)0;
CODADEBUG(CODA_MKDIR, myprintf(("mkdir error %d\n",error));)
}
return(error);
}
int
coda_rmdir(v)
void *v;
{
/* true args */
struct vop_rmdir_args *ap = v;
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;
struct cnode *cp;
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);
}
/* We're being conservative here, it might be that this person
* doesn't really have sufficient access to delete the file
* but we feel zapping the entry won't really hurt anyone -- dcs
*/
/*
* As a side effect of the rmdir, remove any entries for children of
* the directory, especially "." and "..".
*/
cp = coda_nc_lookup(dcp, nm, len, cred);
if (cp) coda_nc_zapParentfid(&(cp->c_fid), NOT_DOWNCALL);
/* Remove the file's entry from the CODA Name Cache */
coda_nc_zapfile(dcp, nm, len);
/* 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(v)
void *v;
{
/* true args */
struct vop_symlink_args *ap = v;
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.
*/
int
coda_readdir(v)
void *v;
{
/* true args */
struct vop_readdir_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
register 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;
MARK_ENTRY(CODA_READDIR_STATS);
CODADEBUG(CODA_READDIR, myprintf(("coda_readdir(%p, %d, %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. */
int opened_internally = 0;
if (cp->c_ovp == NULL) {
opened_internally = 1;
MARK_INT_GEN(CODA_OPEN_STATS);
error = VOP_OPEN(vp, FREAD, cred, td);
printf("coda_readdir: Internally Opening %p\n", vp);
if (error) {
printf("coda_readdir: VOP_OPEN on container failed %d\n", error);
return (error);
}
if (vp->v_type == VREG) {
error = vfs_object_create(vp, td, cred);
if (error != 0) {
printf("coda_readdir: vfs_object_create() returns %d\n", error);
vput(vp);
}
}
if (error) return(error);
}
/* Have UFS handle the call. */
CODADEBUG(CODA_READDIR, myprintf(("indirect readdir: fid = (%lx.%lx.%lx), refcnt = %d\n",cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique, vp->v_usecount)); )
error = VOP_READDIR(cp->c_ovp, uiop, cred, eofflag, ncookies,
cookies);
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);
}
/*
* Convert from file system blocks to device blocks
*/
int
coda_bmap(v)
void *v;
{
/* XXX on the global proc */
/* true args */
struct vop_bmap_args *ap = v;
struct vnode *vp __attribute__((unused)) = ap->a_vp; /* file's vnode */
daddr_t bn __attribute__((unused)) = ap->a_bn; /* fs block number */
struct vnode **vpp = ap->a_vpp; /* RETURN vp of device */
daddr64_t *bnp __attribute__((unused)) = ap->a_bnp; /* RETURN device block number */
struct thread *td __attribute__((unused)) = curthread;
/* upcall decl */
/* locals */
int ret = 0;
struct cnode *cp;
cp = VTOC(vp);
if (cp->c_ovp) {
return EINVAL;
ret = VOP_BMAP(cp->c_ovp, bn, vpp, bnp, ap->a_runp, ap->a_runb);
#if 0
printf("VOP_BMAP(cp->c_ovp %p, bn %p, vpp %p, bnp %lld, ap->a_runp %p, ap->a_runb %p) = %d\n",
cp->c_ovp, bn, vpp, bnp, ap->a_runp, ap->a_runb, ret);
#endif
return ret;
} else {
#if 0
printf("coda_bmap: no container\n");
#endif
return(EOPNOTSUPP);
}
}
/*
* I don't think the following two things are used anywhere, so I've
* commented them out
*
* struct buf *async_bufhead;
* int async_daemon_count;
*/
int
coda_strategy(v)
void *v;
{
/* true args */
struct vop_strategy_args *ap = v;
register struct buf *bp __attribute__((unused)) = ap->a_bp;
struct thread *td __attribute__((unused)) = curthread;
/* upcall decl */
/* locals */
printf("coda_strategy: called ???\n");
return(EOPNOTSUPP);
}
int
coda_reclaim(v)
void *v;
{
/* true args */
struct vop_reclaim_args *ap = v;
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
} else {
#ifdef OLD_DIAGNOSTIC
if (vp->v_usecount != 0)
print("coda_reclaim: pushing active %p\n", vp);
if (VTOC(vp)->c_ovp) {
panic("coda_reclaim: c_ovp not void");
}
#endif
}
cache_purge(vp);
lockdestroy(&(VTOC(vp)->c_lock));
coda_free(VTOC(vp));
VTOC(vp) = NULL;
return (0);
}
int
coda_lock(v)
void *v;
{
/* true args */
struct vop_lock_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct thread *td = ap->a_td;
/* upcall decl */
/* locals */
ENTRY;
if (coda_lockdebug) {
myprintf(("Attempting lock on %lx.%lx.%lx\n",
cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));
}
#ifndef DEBUG_LOCKS
return (lockmgr(&cp->c_lock, ap->a_flags, &vp->v_interlock, td));
#else
return (debuglockmgr(&cp->c_lock, ap->a_flags, &vp->v_interlock, td,
"coda_lock", vp->filename, vp->line));
#endif
}
int
coda_unlock(v)
void *v;
{
/* true args */
struct vop_unlock_args *ap = v;
struct vnode *vp = ap->a_vp;
struct cnode *cp = VTOC(vp);
struct thread *td = ap->a_td;
/* upcall decl */
/* locals */
ENTRY;
if (coda_lockdebug) {
myprintf(("Attempting unlock on %lx.%lx.%lx\n",
cp->c_fid.Volume, cp->c_fid.Vnode, cp->c_fid.Unique));
}
return (lockmgr(&cp->c_lock, ap->a_flags | LK_RELEASE, &vp->v_interlock, td));
}
int
coda_islocked(v)
void *v;
{
/* true args */
struct vop_islocked_args *ap = v;
struct cnode *cp = VTOC(ap->a_vp);
ENTRY;
return (lockstatus(&cp->c_lock, ap->a_td));
}
/* How one looks up a vnode given a device/inode pair: */
int
coda_grab_vnode(dev_t dev, ino_t ino, struct vnode **vpp)
{
/* This is like VFS_VGET() or igetinode()! */
int error;
struct mount *mp;
if (!(mp = devtomp(dev))) {
myprintf(("coda_grab_vnode: devtomp(%#lx) returns NULL\n",
(u_long)dev2udev(dev)));
return(ENXIO);
}
/* XXX - ensure that nonzero-return means failure */
error = VFS_VGET(mp,ino,LK_EXCLUSIVE,vpp);
if (error) {
myprintf(("coda_grab_vnode: iget/vget(%lx, %lu) returns %p, err %d\n",
(u_long)dev2udev(dev), (u_long)ino, (void *)*vpp, error));
return(ENOENT);
}
return(0);
}
void
print_vattr( attr )
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
print_cred(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 fid.Volume and fid.Vnode. 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(fid, vfsp, type)
ViceFid *fid; struct mount *vfsp; short type;
{
struct cnode *cp;
int err;
if ((cp = coda_find(fid)) == NULL) {
struct vnode *vp;
cp = coda_alloc();
lockinit(&cp->c_lock, PINOD, "cnode", 0, 0);
cp->c_fid = *fid;
err = getnewvnode(VT_CODA, vfsp, coda_vnodeop_p, &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);
} else {
vref(CTOV(cp));
}
return cp;
}
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