ctfs_sym.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/cred.h>
#include <sys/vfs.h>
#include <sys/gfs.h>
#include <sys/vnode.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/sysmacros.h>
#include <fs/fs_subr.h>
#include <sys/contract.h>
#include <sys/contract_impl.h>
#include <sys/ctfs.h>
#include <sys/ctfs_impl.h>
#include <sys/file.h>
#include <sys/cmn_err.h>
/*
* CTFS routines for the /system/contract/all/<ctid> vnode.
*/
/*
* ctfs_create_symnode
*
* Creates and returns a symnode for the specified contract.
*/
vnode_t *
ctfs_create_symnode(vnode_t *pvp, contract_t *ct)
{
ctfs_symnode_t *symnode;
vnode_t *vp;
size_t len;
vp = gfs_file_create(sizeof (ctfs_symnode_t), pvp, ctfs_ops_sym);
vp->v_type = VLNK;
symnode = vp->v_data;
symnode->ctfs_sn_contract = ct;
symnode->ctfs_sn_size = len = snprintf(NULL, 0, "../%s/%ld",
ct->ct_type->ct_type_name, (long)ct->ct_id) + 1;
symnode->ctfs_sn_string = kmem_alloc(len, KM_SLEEP);
VERIFY(snprintf(symnode->ctfs_sn_string, len, "../%s/%ld",
ct->ct_type->ct_type_name, (long)ct->ct_id) < len);
contract_hold(ct);
return (vp);
}
/*
* ctfs_sym_getattr - VOP_GETATTR entry point
*/
/* ARGSUSED */
static int
ctfs_sym_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr)
{
ctfs_symnode_t *symnode = vp->v_data;
vap->va_type = VLNK;
vap->va_mode = 0444;
vap->va_nlink = 1;
vap->va_size = symnode->ctfs_sn_size - 1;
vap->va_mtime = vap->va_atime = vap->va_ctime =
symnode->ctfs_sn_contract->ct_ctime;
ctfs_common_getattr(vp, vap);
return (0);
}
/*
* ctfs_sym_readlink - VOP_READLINK entry point
*
* Since we built the symlink string in ctfs_create_symnode, this is
* just a uiomove.
*/
/* ARGSUSED */
int
ctfs_sym_readlink(vnode_t *vp, uio_t *uiop, cred_t *cr)
{
ctfs_symnode_t *symnode = vp->v_data;
return (uiomove(symnode->ctfs_sn_string, symnode->ctfs_sn_size - 1,
UIO_READ, uiop));
}
/*
* ctfs_sym_inactive - VOP_INACTIVE entry point
*/
/* ARGSUSED */
static void
ctfs_sym_inactive(vnode_t *vp, cred_t *cr)
{
ctfs_symnode_t *symnode;
if ((symnode = gfs_file_inactive(vp)) != NULL) {
contract_rele(symnode->ctfs_sn_contract);
kmem_free(symnode->ctfs_sn_string, symnode->ctfs_sn_size);
kmem_free(symnode, sizeof (ctfs_symnode_t));
}
}
const fs_operation_def_t ctfs_tops_sym[] = {
{ VOPNAME_OPEN, ctfs_open },
{ VOPNAME_CLOSE, ctfs_close },
{ VOPNAME_IOCTL, fs_inval },
{ VOPNAME_GETATTR, ctfs_sym_getattr },
{ VOPNAME_READLINK, ctfs_sym_readlink },
{ VOPNAME_ACCESS, ctfs_access_readonly },
{ VOPNAME_READDIR, fs_notdir },
{ VOPNAME_LOOKUP, fs_notdir },
{ VOPNAME_INACTIVE, (fs_generic_func_p) ctfs_sym_inactive },
{ NULL, NULL }
};