fs/ctfs/ctfs_ctl.c

	ctfs_ctl.c revision fa9e4066f08beec538e775443c5be79dd423fcab
/*
 * 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>

/*
 * CTFS routines for the /system/contract/<type>/<ctid>/ctl vnode.
 * CTFS routines for the /system/contract/<type>/<ctid>/status vnode.
 */

/*
 * ctfs_create_ctlnode
 *
 * If necessary, creates a ctlnode for a ctl file and inserts it into
 * the specified cdirnode's gfs_dir_t.  Returns either the existing
 * vnode or the new one.
 */
vnode_t *
ctfs_create_ctlnode(vnode_t *pvp)
{
    ctfs_ctlnode_t *ctlnode;
    ctfs_cdirnode_t *cdirnode = pvp->v_data;
    vnode_t *vp;

    vp = gfs_file_create(sizeof (ctfs_ctlnode_t), pvp, ctfs_ops_ctl);
    ctlnode = vp->v_data;
    /*
     * We transitively have a hold on the contract through our
     * parent directory.
     */
    ctlnode->ctfs_ctl_contract = cdirnode->ctfs_cn_contract;

    return (vp);
}

/*
 * ctfs_ctl_access - VOP_ACCESS entry point
 *
 * You only get to access ctl files for contracts you own or were
 * abandoned and inherited by your containing process contract.
 */
/* ARGSUSED */
static int
ctfs_ctl_access(vnode_t *vp, int mode, int flags, cred_t *cr)
{
    ctfs_ctlnode_t *ctlnode = vp->v_data;
    contract_t *ct = ctlnode->ctfs_ctl_contract;

    if (mode & (VEXEC | VREAD))
        return (EACCES);

    mutex_enter(&ct->ct_lock);
    if ((curproc == ct->ct_owner) ||
        (ct->ct_owner == NULL && ct->ct_regent != NULL &&
        ct->ct_regent->ct_data == curproc->p_ct_process)) {
        mutex_exit(&ct->ct_lock);
        return (0);
    }

    mutex_exit(&ct->ct_lock);
    return (EACCES);
}

/*
 * ctfs_ctl_open - VOP_OPEN entry point
 *
 * Just checks to make sure the mode bits are set, and that the
 * constraints imposed by ctfs_ctl_access are met.
 */
static int
ctfs_ctl_open(vnode_t **vpp, int flag, cred_t *cr)
{
    if (flag != (FWRITE | FOFFMAX))
        return (EINVAL);

    return (ctfs_ctl_access(*vpp, VWRITE, 0, cr));
}

/*
 * ctfs_ctl_getattr - VOP_GETATTR entry point
 */
/* ARGSUSED */
static int
ctfs_ctl_getattr(vnode_t *vp, vattr_t *vap, int flags, cred_t *cr)
{
    ctfs_ctlnode_t *ctlnode = vp->v_data;

    vap->va_type = VREG;
    vap->va_mode = 0222;
    vap->va_nlink = 1;
    vap->va_size = 0;
    vap->va_ctime = ctlnode->ctfs_ctl_contract->ct_ctime;
    mutex_enter(&ctlnode->ctfs_ctl_contract->ct_events.ctq_lock);
    vap->va_atime = vap->va_mtime =
        ctlnode->ctfs_ctl_contract->ct_events.ctq_atime;
    mutex_exit(&ctlnode->ctfs_ctl_contract->ct_events.ctq_lock);
    ctfs_common_getattr(vp, vap);

    return (0);
}

/*
 * ctfs_ctl_ioctl - VOP_IOCTL entry point
 *
 * All the ct_ctl_*(3contract) interfaces point here.
 */
/* ARGSUSED */
static int
ctfs_ctl_ioctl(vnode_t *vp, int cmd, intptr_t arg, int flag, cred_t *cr,
    int *rvalp)
{
    ctfs_ctlnode_t  *ctlnode = vp->v_data;
    contract_t  *ct = ctlnode->ctfs_ctl_contract;
    int     error = 0;
    uint64_t    event;

    switch (cmd) {
    case CT_CABANDON:
        error = contract_abandon(ct, curproc, 1);
        break;

    case CT_CACK:
        if (copyin((void *)arg, &event, sizeof (uint64_t)))
            return (EFAULT);
        error = contract_ack(ct, event);
        break;

    case CT_CNEWCT:
        break;

    case CT_CQREQ:
        break;

    case CT_CADOPT:
        error = contract_adopt(ct, curproc);
        break;

    default:
        return (EINVAL);
    }

    return (error);
}

const fs_operation_def_t ctfs_tops_ctl[] = {
    { VOPNAME_OPEN,     ctfs_ctl_open },
    { VOPNAME_CLOSE,    ctfs_close },
    { VOPNAME_IOCTL,    ctfs_ctl_ioctl },
    { VOPNAME_GETATTR,  ctfs_ctl_getattr },
    { VOPNAME_ACCESS,   ctfs_ctl_access },
    { VOPNAME_READDIR,  fs_notdir },
    { VOPNAME_LOOKUP,   fs_notdir },
    { VOPNAME_INACTIVE, (fs_generic_func_p) gfs_vop_inactive },
    { NULL, NULL }
};

/*
 * ctfs_create_statnode
 *
 * If necessary, creates a ctlnode for a status file and inserts it
 * into the specified cdirnode's gfs_dir_t.  Returns either the
 * existing vnode or the new one.
 */
vnode_t *
ctfs_create_statnode(vnode_t *pvp)
{
    vnode_t *vp;
    ctfs_cdirnode_t *cdirnode = pvp->v_data;
    ctfs_ctlnode_t *ctlnode;

    vp = gfs_file_create(sizeof (ctfs_ctlnode_t), pvp, ctfs_ops_stat);
    ctlnode = vp->v_data;
    /*
     * We transitively have a hold on the contract through our
     * parent directory.
     */
    ctlnode->ctfs_ctl_contract = cdirnode->ctfs_cn_contract;

    return (vp);
}

/*
 * ctfs_stat_ioctl - VOP_IOCTL entry point
 *
 * The kernel half of ct_status_read(3contract).
 */
/* ARGSUSED */
static int
ctfs_stat_ioctl(vnode_t *vp, int cmd, intptr_t arg, int flag, cred_t *cr,
    int *rvalp)
{
    ctfs_ctlnode_t  *statnode = vp->v_data;
    contract_t  *ct = statnode->ctfs_ctl_contract;
    ct_type_t   *type = ct->ct_type;
    STRUCT_DECL(ct_status, st);
    nvlist_t    *foo;
    char        *bufp = NULL;
    size_t      len;
    model_t     mdl = get_udatamodel();
    uint_t      detail;

    STRUCT_INIT(st, mdl);

    if (cmd != CT_SSTATUS)
        return (EINVAL);

    if (copyin((void *)arg, STRUCT_BUF(st), STRUCT_SIZE(st)))
        return (EFAULT);
    detail = STRUCT_FGET(st, ctst_detail);
    if (detail == CTD_COMMON) {
        mutex_enter(&ct->ct_lock);
        contract_status_common(ct, VTOZONE(vp), STRUCT_BUF(st), mdl);
        mutex_exit(&ct->ct_lock);
    } else if (detail <= CTD_ALL) {
        VERIFY(nvlist_alloc(&foo, NV_UNIQUE_NAME, KM_SLEEP) == 0);
        type->ct_type_ops->contop_status(ct, VTOZONE(vp), detail, foo,
            STRUCT_BUF(st), mdl);
        VERIFY(nvlist_pack(foo, &bufp, &len, NV_ENCODE_NATIVE,
            KM_SLEEP) == 0);
        nvlist_free(foo);

        if ((len <= STRUCT_FGET(st, ctst_nbytes)) &&
            (copyout(bufp, STRUCT_FGETP(st, ctst_buffer), len) == -1)) {
            kmem_free(bufp, len);
            return (EFAULT);
        }
        kmem_free(bufp, len);
        STRUCT_FSET(st, ctst_nbytes, len);
    } else {
        return (EINVAL);
    }
    if (copyout(STRUCT_BUF(st), (void *)arg, STRUCT_SIZE(st)))
        return (EFAULT);

    return (0);
}

const fs_operation_def_t ctfs_tops_stat[] = {
    { VOPNAME_OPEN,     ctfs_open },
    { VOPNAME_CLOSE,    ctfs_close },
    { VOPNAME_IOCTL,    ctfs_stat_ioctl },
    { VOPNAME_GETATTR,  ctfs_ctl_getattr },
    { VOPNAME_ACCESS,   ctfs_access_readonly },
    { VOPNAME_READDIR,  fs_notdir },
    { VOPNAME_LOOKUP,   fs_notdir },
    { VOPNAME_INACTIVE, (fs_generic_func_p) gfs_vop_inactive },
    { NULL, NULL }
};