diff options
Diffstat (limited to 'sys/miscfs/umapfs/umap_vnops.c')
| -rw-r--r-- | sys/miscfs/umapfs/umap_vnops.c | 519 |
1 files changed, 0 insertions, 519 deletions
diff --git a/sys/miscfs/umapfs/umap_vnops.c b/sys/miscfs/umapfs/umap_vnops.c deleted file mode 100644 index 5bf29c8b089b..000000000000 --- a/sys/miscfs/umapfs/umap_vnops.c +++ /dev/null @@ -1,519 +0,0 @@ -/* - * 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 8.6 (Berkeley) 5/22/95 - * $FreeBSD$ - */ - -/* - * Umap Layer - */ - -#include <sys/param.h> -#include <sys/systm.h> -#include <sys/kernel.h> -#include <sys/lock.h> -#include <sys/malloc.h> -#include <sys/mount.h> -#include <sys/namei.h> -#include <sys/sysctl.h> -#include <sys/vnode.h> - -#include <miscfs/umapfs/umap.h> -#include <miscfs/nullfs/null.h> - -static int umap_bug_bypass = 0; /* for debugging: enables bypass printf'ing */ -SYSCTL_INT(_debug, OID_AUTO, umapfs_bug_bypass, CTLFLAG_RW, - &umap_bug_bypass, 0, ""); - -static int umap_bypass __P((struct vop_generic_args *ap)); -static int umap_getattr __P((struct vop_getattr_args *ap)); -static int umap_inactive __P((struct vop_inactive_args *ap)); -static int umap_lock __P((struct vop_lock_args *ap)); -static int umap_print __P((struct vop_print_args *ap)); -static int umap_reclaim __P((struct vop_reclaim_args *ap)); -static int umap_rename __P((struct vop_rename_args *ap)); -static int umap_unlock __P((struct vop_unlock_args *ap)); - -/* - * This is the 10-Apr-92 bypass routine. - * See null_vnops.c:null_bypass for more details. - */ -static int -umap_bypass(ap) - struct vop_generic_args /* { - struct vnodeop_desc *a_desc; - <other random data follows, presumably> - } */ *ap; -{ - struct ucred **credpp = 0, *credp = 0; - struct ucred *savecredp = 0, *savecompcredp = 0; - struct ucred *compcredp = 0; - struct vnode **this_vp_p; - int error; - 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 DIAGNOSTIC - /* - * 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)->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); - - /* Save old values */ - - savecredp = (*credpp); - if (savecredp != NOCRED) - (*credpp) = crdup(savecredp); - credp = *credpp; - - if (umap_bug_bypass && credp->cr_uid != 0) - printf("umap_bypass: user was %lu, group %lu\n", - (u_long)credp->cr_uid, (u_long)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 %lu, group %lu\n", - (u_long)credp->cr_uid, (u_long)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); - - compcredp = (*compnamepp)->cn_cred; - savecompcredp = compcredp; - if (savecompcredp != NOCRED) - (*compnamepp)->cn_cred = crdup(savecompcredp); - compcredp = (*compnamepp)->cn_cred; - - if (umap_bug_bypass && compcredp->cr_uid != 0) - printf( - "umap_bypass: component credit user was %lu, group %lu\n", - (u_long)compcredp->cr_uid, - (u_long)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 %lu, group %lu\n", - (u_long)compcredp->cr_uid, - (u_long)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]) { - *(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) - goto out; - vppp = VOPARG_OFFSETTO(struct vnode***, - descp->vdesc_vpp_offset, ap); - if (*vppp) - error = umap_node_create(old_vps[0]->v_mount, **vppp, *vppp); - }; - - out: - /* - * Free duplicate cred structure and restore old one. - */ - if (descp->vdesc_cred_offset != VDESC_NO_OFFSET) { - if (umap_bug_bypass && credp && credp->cr_uid != 0) - printf("umap_bypass: returning-user was %lu\n", - (u_long)credp->cr_uid); - - if (savecredp != NOCRED) { - crfree(credp); - (*credpp) = savecredp; - if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0) - printf( - "umap_bypass: returning-user now %lu\n\n", - (u_long)(*credpp)->cr_uid); - } - } - - if (descp->vdesc_componentname_offset != VDESC_NO_OFFSET) { - if (umap_bug_bypass && compcredp && compcredp->cr_uid != 0) - printf( - "umap_bypass: returning-component-user was %lu\n", - (u_long)compcredp->cr_uid); - - if (savecompcredp != NOCRED) { - crfree(compcredp); - (*compnamepp)->cn_cred = savecompcredp; - if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0) - printf( - "umap_bypass: returning-component-user now %lu\n", - (u_long)compcredp->cr_uid); - } - } - - return (error); -} - - -/* - * We handle getattr to change the fsid. - */ -static int -umap_getattr(ap) - struct vop_getattr_args /* { - struct vnode *a_vp; - struct vattr *a_vap; - struct ucred *a_cred; - struct proc *a_p; - } */ *ap; -{ - short uid, gid; - int error, tmpid, nentries, gnentries; - u_long (*mapdata)[2], (*gmapdata)[2]; - struct vnode **vp1p; - struct vnodeop_desc *descp = ap->a_desc; - - error = umap_bypass((struct vop_generic_args *)ap); - if (error) - return (error); - - /* - * 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); - nentries = MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_nentries; - mapdata = (MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_mapdata); - 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, mapdata, nentries); - - 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); -} - -/* - * 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. - */ -static int -umap_lock(ap) - struct vop_lock_args /* { - struct vnode *a_vp; - int a_flags; - struct proc *a_p; - } */ *ap; -{ - - vop_nolock(ap); - if ((ap->a_flags & LK_TYPE_MASK) == LK_DRAIN) - return (0); - ap->a_flags &= ~LK_INTERLOCK; - return (null_bypass((struct vop_generic_args *)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(ap) - struct vop_unlock_args /* { - struct vnode *a_vp; - int a_flags; - struct proc *a_p; - } */ *ap; -{ - vop_nounlock(ap); - ap->a_flags &= ~LK_INTERLOCK; - return (null_bypass((struct vop_generic_args *)ap)); -} - -static int -umap_inactive(ap) - struct vop_inactive_args /* { - struct vnode *a_vp; - struct proc *a_p; - } */ *ap; -{ - struct vnode *vp = ap->a_vp; - struct umap_node *xp = VTOUMAP(vp); - struct vnode *lowervp = xp->umap_lowervp; - /* - * 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_INACTIVE(lowervp, ap->a_p); - VOP_UNLOCK(ap->a_vp, 0, ap->a_p); - return (0); -} - -static int -umap_reclaim(ap) - struct vop_reclaim_args /* { - struct vnode *a_vp; - } */ *ap; -{ - 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); -} - -static int -umap_print(ap) - struct vop_print_args /* { - struct vnode *a_vp; - } */ *ap; -{ - struct vnode *vp = ap->a_vp; - printf("\ttag VT_UMAPFS, vp=%p, lowervp=%p\n", vp, UMAPVPTOLOWERVP(vp)); - return (0); -} - -static int -umap_rename(ap) - 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; -{ - int error; - struct componentname *compnamep; - struct ucred *compcredp, *savecompcredp; - struct vnode *vp; - - /* - * Rename is irregular, having two componentname structures. - * We need to map the cre 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 %lu, group %lu\n", - (u_long)compcredp->cr_uid, (u_long)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 %lu, group %lu\n", - (u_long)compcredp->cr_uid, (u_long)compcredp->cr_gid); - - error = umap_bypass((struct vop_generic_args *)ap); - - /* Restore the additional mapped componentname cred structure. */ - - crfree(compcredp); - compnamep->cn_cred = savecompcredp; - - return error; -} - -/* - * Global vfs data structures - */ -/* - * XXX - strategy, bwrite are hand coded currently. They should - * go away with a merged buffer/block cache. - * - */ -vop_t **umap_vnodeop_p; -static struct vnodeopv_entry_desc umap_vnodeop_entries[] = { - { &vop_default_desc, (vop_t *) umap_bypass }, - { &vop_getattr_desc, (vop_t *) umap_getattr }, - { &vop_inactive_desc, (vop_t *) umap_inactive }, - { &vop_lock_desc, (vop_t *) umap_lock }, - { &vop_print_desc, (vop_t *) umap_print }, - { &vop_reclaim_desc, (vop_t *) umap_reclaim }, - { &vop_rename_desc, (vop_t *) umap_rename }, - { &vop_unlock_desc, (vop_t *) umap_unlock }, - { NULL, NULL } -}; -static struct vnodeopv_desc umap_vnodeop_opv_desc = - { &umap_vnodeop_p, umap_vnodeop_entries }; - -VNODEOP_SET(umap_vnodeop_opv_desc); |