diff options
Diffstat (limited to 'sys/contrib/lomac/lomacfs_subr.c')
| -rw-r--r-- | sys/contrib/lomac/lomacfs_subr.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/sys/contrib/lomac/lomacfs_subr.c b/sys/contrib/lomac/lomacfs_subr.c new file mode 100644 index 0000000..b58abc1 --- /dev/null +++ b/sys/contrib/lomac/lomacfs_subr.c @@ -0,0 +1,118 @@ +/*- + * Copyright (c) 2001 Networks Associates Technology, Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id: lomacfs_subr.c,v 1.24 2001/11/05 20:57:41 tfraser Exp $ + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <sys/namei.h> + +#include <vm/vm.h> +#include <vm/vm_extern.h> + +#include "lomacfs.h" +#include "kernel_plm.h" + +int +lomacfs_node_alloc(struct mount *mp, struct componentname *cnp, + struct vnode *dvp, struct vnode *lowervp, struct vnode **vpp) { + lomac_object_t lobj; + struct thread *td = curthread; + struct vnode *vp; + struct lomac_node *lp; + lattr_t subjlattr, objlattr; + int error; + + KASSERT((cnp == NULL) == (dvp == NULL), + ("lomacfs_node_alloc: dvp and cnp do not match")); + lp = malloc(sizeof(*lp), M_LOMACFS, M_WAITOK); + if (dvp != NULL) { + error = cache_lookup(dvp, vpp, cnp); + if (error == -1) { /* lost the race; return EEXIST and the vp */ + vput(lowervp); + error = vget(*vpp, LK_EXCLUSIVE, td); + free(lp, M_LOMACFS); + if (error) { + *vpp = NULL; + return (error); + } else + return (EEXIST); + } + } + error = getnewvnode(VT_NULL, mp, lomacfs_vnodeop_p, vpp); + if (error) { + vput(lowervp); + free(lp, M_LOMACFS); + return (error); + } + vp = *vpp; + + vp->v_type = lowervp != NULL ? lowervp->v_type : VBAD; + if (vp->v_type == VCHR) + vp->v_rdev = lowervp->v_rdev; + vp->v_data = lp; + lp->ln_vp = vp; + lp->ln_lowervp = lowervp; + if (lowervp != NULL) + vhold(lowervp); + get_subject_lattr(curthread->td_proc, &subjlattr); + lp->ln_flags = 0; + lomac_plm_init_lomacfs_vnode(dvp, vp, cnp, &subjlattr); + /* retrieve the just-initialized attributes */ + lobj.lo_type = LO_TYPE_LVNODE; + lobj.lo_object.vnode = vp; + get_object_lattr(&lobj, &objlattr); + /* propogate the lattr to the underlying vnode */ + lobj.lo_type = LO_TYPE_UVNODE; + lobj.lo_object.vnode = lowervp; + set_object_lattr(&lobj, objlattr); +#if defined(LOMAC_DEBUG_INCNAME) + if (cnp == NULL) + strncpy(lp->ln_name, "/", sizeof(lp->ln_name)); + else { + strncpy(lp->ln_name, cnp->cn_nameptr, cnp->cn_namelen); + lp->ln_name[cnp->cn_namelen] = '\0'; + } +#endif + error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY | LK_THISLAYER, td); + if (error) + panic("lomacfs_node_alloc: can't lock new vnode\n"); + if (cnp == NULL) + vp->v_flag |= VROOT; + else if (cnp->cn_flags & MAKEENTRY) + cache_enter(dvp, vp, cnp); + +#if defined(LOMAC_DEBUG_NODE_ALLOC) + printf("lomacfs: made vp %p for lvp %p \"%.*s\" in dvp %p from %s\n", + vp, lowervp, cnp ? (int)cnp->cn_namelen : 0, + cnp ? cnp->cn_nameptr : "", dvp, + lowervp != NULL ? lowervp->v_mount->mnt_stat.f_mntonname : ""); +#endif + + return (0); +} |
