/* $OpenBSD: umap_vnops.c,v 1.14 2002/03/14 01:27:08 millert Exp $ */ /* $NetBSD: umap_vnops.c,v 1.5.4.1 1996/05/25 22:13:35 jtc Exp $ */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software donated to Berkeley by * the UCLA Ficus project. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)umap_vnops.c 8.3 (Berkeley) 1/5/94 */ /* * Umap Layer */ #include #include #include #include #include #include #include #include #include #include #include int umap_bug_bypass = 0; /* for debugging: enables bypass printf'ing */ int umap_bypass(void *); int umap_getattr(void *); int umap_inactive(void *); int umap_reclaim(void *); int umap_print(void *); int umap_rename(void *); int umap_strategy(void *); int umap_bwrite(void *); int umap_unlock(void *); int umap_lock(void *); /* * Global vfs data structures */ /* * XXX - strategy, bwrite are hand coded currently. They should * go away with a merged buffer/block cache. * */ int (**umap_vnodeop_p)(void *); struct vnodeopv_entry_desc umap_vnodeop_entries[] = { { &vop_default_desc, umap_bypass }, { &vop_getattr_desc, umap_getattr }, { &vop_inactive_desc, umap_inactive }, { &vop_reclaim_desc, umap_reclaim }, { &vop_print_desc, umap_print }, { &vop_rename_desc, umap_rename }, { &vop_lock_desc, umap_lock }, { &vop_unlock_desc, umap_unlock }, { &vop_strategy_desc, umap_strategy }, { &vop_bwrite_desc, umap_bwrite }, { NULL, NULL } }; struct vnodeopv_desc umap_vnodeop_opv_desc = { &umap_vnodeop_p, umap_vnodeop_entries }; /* * This is the 10-Apr-92 bypass routine. * See null_vnops.c:null_bypass for more details. */ int umap_bypass(v) void *v; { struct vop_generic_args /* { struct vnodeop_desc *a_desc; } */ *ap = v; struct ucred **credpp = 0, *credp = 0; struct ucred *savecredp = 0, *savecompcredp = 0; struct ucred *compcredp = 0; struct vnode **this_vp_p; int error = 0; struct vnode *old_vps[VDESC_MAX_VPS]; struct vnode *vp1 = 0; struct vnode **vps_p[VDESC_MAX_VPS]; struct vnode ***vppp; struct vnodeop_desc *descp = ap->a_desc; int reles, i; struct componentname **compnamepp = 0; if (umap_bug_bypass) printf ("umap_bypass: %s\n", descp->vdesc_name); #ifdef SAFETY /* * We require at least one vp. */ if (descp->vdesc_vp_offsets == NULL || descp->vdesc_vp_offsets[0] == VDESC_NO_OFFSET) panic ("umap_bypass: no vp's in map."); #endif /* * Map the vnodes going in. * Later, we'll invoke the operation based on * the first mapped vnode's operation vector. */ reles = descp->vdesc_flags; for (i = 0; i < VDESC_MAX_VPS; reles >>= 1, i++) { if (descp->vdesc_vp_offsets[i] == VDESC_NO_OFFSET) break; /* bail out at end of list */ vps_p[i] = this_vp_p = VOPARG_OFFSETTO(struct vnode**, descp->vdesc_vp_offsets[i], ap); if (i == 0) { vp1 = *vps_p[0]; } /* * We're not guaranteed that any but the first vnode * are of our type. Check for and don't map any * that aren't. (Must map first vp or vclean fails.) */ if (i && (*this_vp_p == NULLVP || (*this_vp_p)->v_op != umap_vnodeop_p)) { old_vps[i] = NULL; } else { old_vps[i] = *this_vp_p; *(vps_p[i]) = UMAPVPTOLOWERVP(*this_vp_p); if (reles & 1) VREF(*this_vp_p); } } /* * Fix the credentials. (That's the purpose of this layer.) */ if (descp->vdesc_cred_offset != VDESC_NO_OFFSET && *(credpp = VOPARG_OFFSETTO(struct ucred**, descp->vdesc_cred_offset, ap)) != NOCRED ) { /* Save old values */ savecredp = *credpp; *credpp = crdup(savecredp); credp = *credpp; if (umap_bug_bypass && credp->cr_uid != 0) printf("umap_bypass: user was %d, group %d\n", credp->cr_uid, credp->cr_gid); /* Map all ids in the credential structure. */ umap_mapids(vp1->v_mount, credp); if (umap_bug_bypass && credp->cr_uid != 0) printf("umap_bypass: user now %d, group %d\n", credp->cr_uid, credp->cr_gid); } /* BSD often keeps a credential in the componentname structure * for speed. If there is one, it better get mapped, too. */ if (descp->vdesc_componentname_offset != VDESC_NO_OFFSET && (*(compnamepp = VOPARG_OFFSETTO(struct componentname**, descp->vdesc_componentname_offset, ap)))->cn_cred != NOCRED ) { savecompcredp = (*compnamepp)->cn_cred; (*compnamepp)->cn_cred = crdup(savecompcredp); compcredp = (*compnamepp)->cn_cred; if (umap_bug_bypass && compcredp->cr_uid != 0) printf("umap_bypass: component credit user was %d, group %d\n", compcredp->cr_uid, compcredp->cr_gid); /* Map all ids in the credential structure. */ umap_mapids(vp1->v_mount, compcredp); if (umap_bug_bypass && compcredp->cr_uid != 0) printf("umap_bypass: component credit user now %d, group %d\n", compcredp->cr_uid, compcredp->cr_gid); } /* * Call the operation on the lower layer * with the modified argument structure. */ error = VCALL(*(vps_p[0]), descp->vdesc_offset, ap); /* * Maintain the illusion of call-by-value * by restoring vnodes in the argument structure * to their original value. */ reles = descp->vdesc_flags; for (i = 0; i < VDESC_MAX_VPS; reles >>= 1, i++) { if (descp->vdesc_vp_offsets[i] == VDESC_NO_OFFSET) break; /* bail out at end of list */ if (old_vps[i] != NULLVP) { *(vps_p[i]) = old_vps[i]; if (reles & 1) vrele(*(vps_p[i])); }; }; /* * Map the possible out-going vpp * (Assumes that the lower layer always returns * a VREF'ed vpp unless it gets an error.) */ if (descp->vdesc_vpp_offset != VDESC_NO_OFFSET && !(descp->vdesc_flags & VDESC_NOMAP_VPP) && !error) { if (!(descp->vdesc_flags & VDESC_VPP_WILLRELE)) { vppp = VOPARG_OFFSETTO(struct vnode***, descp->vdesc_vpp_offset, ap); error = umap_node_create(old_vps[0]->v_mount, **vppp, *vppp); } } /* * Free duplicate cred structure and restore old one. */ if (descp->vdesc_cred_offset != VDESC_NO_OFFSET && *credpp != NOCRED) { if (umap_bug_bypass && credp && credp->cr_uid != 0) printf("umap_bypass: returning-user was %d\n", credp->cr_uid); crfree(credp); *credpp = savecredp; if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0) printf("umap_bypass: returning-user now %d\n\n", savecredp->cr_uid); } if (descp->vdesc_componentname_offset != VDESC_NO_OFFSET && savecompcredp != NOCRED ) { if (umap_bug_bypass && compcredp && compcredp->cr_uid != 0) printf("umap_bypass: returning-component-user was %d\n", compcredp->cr_uid); crfree(compcredp); (*compnamepp)->cn_cred = savecompcredp; if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0) printf("umap_bypass: returning-component-user now %d\n", savecompcredp->cr_uid); } return (error); } /* * We handle getattr to change the fsid. */ int umap_getattr(v) void *v; { struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; struct ucred *a_cred; struct proc *a_p; } */ *ap = v; uid_t uid; gid_t gid; int error, tmpid, unentries, gnentries; id_map_t umapdata, gmapdata; struct vnode **vp1p; struct vnodeop_desc *descp = ap->a_desc; if ((error = umap_bypass(ap)) != 0) return (error); /* Requires that arguments be restored. */ ap->a_vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; /* * Umap needs to map the uid and gid returned by a stat * into the proper values for this site. This involves * finding the returned uid in the mapping information, * translating it into the uid on the other end, * and filling in the proper field in the vattr * structure pointed to by ap->a_vap. The group * is easier, since currently all groups will be * translate to the NULLGROUP. */ /* Find entry in map */ uid = ap->a_vap->va_uid; gid = ap->a_vap->va_gid; if (umap_bug_bypass) printf("umap_getattr: mapped uid = %d, mapped gid = %d\n", uid, gid); vp1p = VOPARG_OFFSETTO(struct vnode**, descp->vdesc_vp_offsets[0], ap); unentries = MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_unentries; umapdata = (MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_umapdata); gnentries = MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_gnentries; gmapdata = (MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_gmapdata); /* Reverse map the uid for the vnode. Since it's a reverse map, we can't use umap_mapids() to do it. */ tmpid = umap_reverse_findid(uid, umapdata, unentries); if (tmpid != -1) { ap->a_vap->va_uid = (uid_t) tmpid; if (umap_bug_bypass) printf("umap_getattr: original uid = %d\n", uid); } else ap->a_vap->va_uid = (uid_t) NOBODY; /* Reverse map the gid for the vnode. */ tmpid = umap_reverse_findid(gid, gmapdata, gnentries); if (tmpid != -1) { ap->a_vap->va_gid = (gid_t) tmpid; if (umap_bug_bypass) printf("umap_getattr: original gid = %d\n", gid); } else ap->a_vap->va_gid = (gid_t) NULLGROUP; return (0); } /*ARGSUSED*/ int umap_inactive(v) void *v; { struct vop_inactive_args /* { struct vnode *a_vp; struct proc *a_p; } */ *ap = v; /* * Do nothing (and _don't_ bypass). * Wait to vrele lowervp until reclaim, * so that until then our umap_node is in the * cache and reusable. * */ VOP_UNLOCK(ap->a_vp, 0, ap->a_p); return (0); } /* * We need to process our own vnode lock and then clear the * interlock flag as it applies only to our vnode, not the * vnodes below us on the stack. */ int umap_lock(v) void *v; { struct vop_lock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap = v; #if 0 vop_generic_lock(ap); #endif if ((ap->a_flags & LK_TYPE_MASK) == LK_DRAIN) return (0); ap->a_flags &= ~LK_INTERLOCK; return (umap_bypass(ap)); } /* * We need to process our own vnode unlock and then clear the * interlock flag as it applies only to our vnode, not the * vnodes below us on the stack. */ int umap_unlock(v) void *v; { struct vop_unlock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap = v; #if 0 vop_generic_unlock(ap); #endif ap->a_flags &= ~LK_INTERLOCK; return (umap_bypass(ap)); } int umap_reclaim(v) void *v; { struct vop_reclaim_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct umap_node *xp = VTOUMAP(vp); struct vnode *lowervp = xp->umap_lowervp; /* After this assignment, this node will not be re-used. */ xp->umap_lowervp = NULL; LIST_REMOVE(xp, umap_hash); FREE(vp->v_data, M_TEMP); vp->v_data = NULL; vrele(lowervp); return (0); } int umap_strategy(v) void *v; { struct vop_strategy_args /* { struct buf *a_bp; } */ *ap = v; struct buf *bp = ap->a_bp; int error; struct vnode *savedvp; savedvp = bp->b_vp; bp->b_vp = UMAPVPTOLOWERVP(bp->b_vp); error = VOP_STRATEGY(ap->a_bp); bp->b_vp = savedvp; return (error); } int umap_bwrite(v) void *v; { struct vop_bwrite_args /* { struct buf *a_bp; } */ *ap = v; struct buf *bp = ap->a_bp; int error; struct vnode *savedvp; savedvp = bp->b_vp; bp->b_vp = UMAPVPTOLOWERVP(bp->b_vp); error = VOP_BWRITE(ap->a_bp); bp->b_vp = savedvp; return (error); } int umap_print(v) void *v; { struct vop_print_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; printf("\ttag VT_UMAPFS, vp=%p, lowervp=%p\n", vp, UMAPVPTOLOWERVP(vp)); return (0); } int umap_rename(v) void *v; { struct vop_rename_args /* { struct vnode *a_fdvp; struct vnode *a_fvp; struct componentname *a_fcnp; struct vnode *a_tdvp; struct vnode *a_tvp; struct componentname *a_tcnp; } */ *ap = v; int error; struct componentname *compnamep; struct ucred *compcredp, *savecompcredp; struct vnode *vp; /* * Rename is irregular, having two componentname structures. * We need to map the cred in the second structure, * and then bypass takes care of the rest. */ vp = ap->a_fdvp; compnamep = ap->a_tcnp; compcredp = compnamep->cn_cred; savecompcredp = compcredp; compcredp = compnamep->cn_cred = crdup(savecompcredp); if (umap_bug_bypass && compcredp->cr_uid != 0) printf("umap_rename: rename component credit user was %d, group %d\n", compcredp->cr_uid, compcredp->cr_gid); /* Map all ids in the credential structure. */ umap_mapids(vp->v_mount, compcredp); if (umap_bug_bypass && compcredp->cr_uid != 0) printf("umap_rename: rename component credit user now %d, group %d\n", compcredp->cr_uid, compcredp->cr_gid); error = umap_bypass(ap); /* Restore the additional mapped componentname cred structure. */ crfree(compcredp); compnamep->cn_cred = savecompcredp; return error; }