2 * Copyright (c) 1992, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software donated to Berkeley by
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36 * @(#)umap_vnops.c 8.6 (Berkeley) 5/22/95
37 * $FreeBSD: src/sys/miscfs/umapfs/umap_vnops.c,v 1.30 1999/08/30 07:08:04 bde Exp $
38 * $DragonFly: src/sys/vfs/umapfs/Attic/umap_vnops.c,v 1.15 2005/09/14 01:13:49 dillon Exp $
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/kernel.h>
48 #include <sys/sysctl.h>
49 #include <sys/vnode.h>
50 #include <sys/mount.h>
52 #include <sys/namei.h>
53 #include <sys/malloc.h>
57 static int umap_bug_bypass = 0; /* for debugging: enables bypass printf'ing */
58 SYSCTL_INT(_debug, OID_AUTO, umapfs_bug_bypass, CTLFLAG_RW,
59 &umap_bug_bypass, 0, "");
61 static int umap_bypass (struct vop_generic_args *ap);
62 static int umap_getattr (struct vop_getattr_args *ap);
63 static int umap_inactive (struct vop_inactive_args *ap);
64 static int umap_lock (struct vop_lock_args *ap);
65 static int umap_print (struct vop_print_args *ap);
66 static int umap_reclaim (struct vop_reclaim_args *ap);
67 static int umap_rename (struct vop_old_rename_args *ap);
68 static int umap_unlock (struct vop_unlock_args *ap);
71 * This is the 10-Apr-92 bypass routine.
72 * See null_vnops.c:null_bypass for more details.
74 * umap_bypass(struct vnodeop_desc *a_desc, ...)
77 umap_bypass(struct vop_generic_args *ap)
79 struct ucred **credpp = 0, *credp = 0;
80 struct ucred *savecredp = 0, *savecompcredp = 0;
81 struct ucred *compcredp = 0;
82 struct vnode **this_vp_p;
84 struct vnode *old_vps[VDESC_MAX_VPS];
85 struct vnode *vp1 = 0;
86 struct vnode **vps_p[VDESC_MAX_VPS];
88 struct vnodeop_desc *descp = ap->a_desc;
90 struct componentname **compnamepp = 0;
93 printf ("umap_bypass: %s\n", descp->vdesc_name);
97 * We require at least one vp.
99 if (descp->vdesc_vp_offsets == NULL ||
100 descp->vdesc_vp_offsets[0] == VDESC_NO_OFFSET)
101 panic ("umap_bypass: no vp's in map");
105 * Map the vnodes going in.
106 * Later, we'll invoke the operation based on
107 * the first mapped vnode's operation vector.
109 reles = descp->vdesc_flags;
110 for (i = 0; i < VDESC_MAX_VPS; reles >>= 1, i++) {
111 if (descp->vdesc_vp_offsets[i] == VDESC_NO_OFFSET)
112 break; /* bail out at end of list */
113 vps_p[i] = this_vp_p =
114 VOPARG_OFFSETTO(struct vnode**, descp->vdesc_vp_offsets[i], ap);
121 * We're not guaranteed that any but the first vnode
122 * are of our type. Check for and don't map any
123 * that aren't. (Must map first vp or vclean fails.)
126 if (i && (*this_vp_p)->v_tag != VT_UMAP) {
129 old_vps[i] = *this_vp_p;
130 *(vps_p[i]) = UMAPVPTOLOWERVP(*this_vp_p);
138 * Fix the credentials. (That's the purpose of this layer.)
141 if (descp->vdesc_cred_offset != VDESC_NO_OFFSET) {
143 credpp = VOPARG_OFFSETTO(struct ucred**,
144 descp->vdesc_cred_offset, ap);
146 /* Save old values */
148 savecredp = (*credpp);
149 if (savecredp != NOCRED)
150 (*credpp) = crdup(savecredp);
153 if (umap_bug_bypass && credp->cr_uid != 0)
154 printf("umap_bypass: user was %lu, group %lu\n",
155 (u_long)credp->cr_uid, (u_long)credp->cr_gid);
157 /* Map all ids in the credential structure. */
159 umap_mapids(vp1->v_mount, credp);
161 if (umap_bug_bypass && credp->cr_uid != 0)
162 printf("umap_bypass: user now %lu, group %lu\n",
163 (u_long)credp->cr_uid, (u_long)credp->cr_gid);
166 /* BSD often keeps a credential in the componentname structure
167 * for speed. If there is one, it better get mapped, too.
170 if (descp->vdesc_componentname_offset != VDESC_NO_OFFSET) {
172 compnamepp = VOPARG_OFFSETTO(struct componentname**,
173 descp->vdesc_componentname_offset, ap);
175 compcredp = (*compnamepp)->cn_cred;
176 savecompcredp = compcredp;
177 if (savecompcredp != NOCRED)
178 (*compnamepp)->cn_cred = crdup(savecompcredp);
179 compcredp = (*compnamepp)->cn_cred;
181 if (umap_bug_bypass && compcredp->cr_uid != 0)
183 "umap_bypass: component credit user was %lu, group %lu\n",
184 (u_long)compcredp->cr_uid,
185 (u_long)compcredp->cr_gid);
187 /* Map all ids in the credential structure. */
189 umap_mapids(vp1->v_mount, compcredp);
191 if (umap_bug_bypass && compcredp->cr_uid != 0)
193 "umap_bypass: component credit user now %lu, group %lu\n",
194 (u_long)compcredp->cr_uid,
195 (u_long)compcredp->cr_gid);
199 * Call the operation on the lower layer with the modified argument
200 * structure. We have to adjust a_fm to point at the lower layer.
202 ap->a_ops = *(*(vps_p[0]))->v_ops;
203 error = vop_vnoperate_ap(ap);
206 * Maintain the illusion of call-by-value
207 * by restoring vnodes in the argument structure
208 * to their original value.
210 reles = descp->vdesc_flags;
211 for (i = 0; i < VDESC_MAX_VPS; reles >>= 1, i++) {
212 if (descp->vdesc_vp_offsets[i] == VDESC_NO_OFFSET)
213 break; /* bail out at end of list */
215 *(vps_p[i]) = old_vps[i];
222 * Map the possible out-going vpp
223 * (Assumes that the lower layer always returns
224 * a vref'ed vpp unless it gets an error.)
226 if (descp->vdesc_vpp_offset != VDESC_NO_OFFSET &&
227 !(descp->vdesc_flags & VDESC_NOMAP_VPP) &&
229 if (descp->vdesc_flags & VDESC_VPP_WILLRELE)
231 vppp = VOPARG_OFFSETTO(struct vnode***,
232 descp->vdesc_vpp_offset, ap);
234 error = umap_node_create(old_vps[0]->v_mount, **vppp, *vppp);
239 * Free duplicate cred structure and restore old one.
241 if (descp->vdesc_cred_offset != VDESC_NO_OFFSET) {
242 if (umap_bug_bypass && credp && credp->cr_uid != 0)
243 printf("umap_bypass: returning-user was %lu\n",
244 (u_long)credp->cr_uid);
246 if (savecredp != NOCRED) {
248 (*credpp) = savecredp;
249 if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0)
251 "umap_bypass: returning-user now %lu\n\n",
252 (u_long)(*credpp)->cr_uid);
256 if (descp->vdesc_componentname_offset != VDESC_NO_OFFSET) {
257 if (umap_bug_bypass && compcredp && compcredp->cr_uid != 0)
259 "umap_bypass: returning-component-user was %lu\n",
260 (u_long)compcredp->cr_uid);
262 if (savecompcredp != NOCRED) {
264 (*compnamepp)->cn_cred = savecompcredp;
265 if (umap_bug_bypass && credpp && (*credpp)->cr_uid != 0)
267 "umap_bypass: returning-component-user now %lu\n",
268 (u_long)compcredp->cr_uid);
277 * We handle getattr to change the fsid.
279 * umap_getattr(struct vnode *a_vp, struct vattr *a_vap, struct ucred *a_cred,
280 * struct thread *a_td)
283 umap_getattr(struct vop_getattr_args *ap)
286 int error, tmpid, nentries, gnentries;
287 u_long (*mapdata)[2], (*gmapdata)[2];
289 struct vnodeop_desc *descp = ap->a_head.a_desc;
291 error = umap_bypass(&ap->a_head);
296 * Umap needs to map the uid and gid returned by a stat
297 * into the proper values for this site. This involves
298 * finding the returned uid in the mapping information,
299 * translating it into the uid on the other end,
300 * and filling in the proper field in the vattr
301 * structure pointed to by ap->a_vap. The group
302 * is easier, since currently all groups will be
303 * translate to the NULLGROUP.
306 /* Find entry in map */
308 uid = ap->a_vap->va_uid;
309 gid = ap->a_vap->va_gid;
311 printf("umap_getattr: mapped uid = %d, mapped gid = %d\n", uid,
314 vp1p = VOPARG_OFFSETTO(struct vnode**, descp->vdesc_vp_offsets[0], ap);
315 nentries = MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_nentries;
316 mapdata = (MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_mapdata);
317 gnentries = MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_gnentries;
318 gmapdata = (MOUNTTOUMAPMOUNT((*vp1p)->v_mount)->info_gmapdata);
320 /* Reverse map the uid for the vnode. Since it's a reverse
321 map, we can't use umap_mapids() to do it. */
323 tmpid = umap_reverse_findid(uid, mapdata, nentries);
327 ap->a_vap->va_uid = (uid_t) tmpid;
329 printf("umap_getattr: original uid = %d\n", uid);
331 ap->a_vap->va_uid = (uid_t) NOBODY;
333 /* Reverse map the gid for the vnode. */
335 tmpid = umap_reverse_findid(gid, gmapdata, gnentries);
339 ap->a_vap->va_gid = (gid_t) tmpid;
341 printf("umap_getattr: original gid = %d\n", gid);
343 ap->a_vap->va_gid = (gid_t) NULLGROUP;
349 * We need to process our own vnode lock and then clear the
350 * interlock flag as it applies only to our vnode, not the
351 * vnodes below us on the stack.
353 * umap_lock(struct vnode *a_vp, int a_flags, struct thread *a_td)
356 umap_lock(struct vop_lock_args *ap)
358 if ((ap->a_flags & LK_TYPE_MASK) == LK_DRAIN)
360 return (null_bypass(&ap->a_head));
364 * We need to process our own vnode unlock and then clear the
365 * interlock flag as it applies only to our vnode, not the
366 * vnodes below us on the stack.
368 * umap_unlock(struct vnode *a_vp, int a_flags, struct thread *a_td)
371 umap_unlock(struct vop_unlock_args *ap)
373 return (null_bypass(&ap->a_head));
377 * umap_inactive(struct vnode *a_vp, struct thread *a_td)
380 umap_inactive(struct vop_inactive_args *ap)
382 struct vnode *vp = ap->a_vp;
383 struct umap_node *xp = VTOUMAP(vp);
384 struct vnode *lowervp = xp->umap_lowervp;
386 * Do nothing (and _don't_ bypass).
387 * Wait to vrele lowervp until reclaim,
388 * so that until then our umap_node is in the
389 * cache and reusable.
392 VOP_INACTIVE(lowervp, ap->a_td);
397 * umap_reclaim(struct vnode *a_vp)
400 umap_reclaim(struct vop_reclaim_args *ap)
402 struct vnode *vp = ap->a_vp;
403 struct umap_node *xp = VTOUMAP(vp);
404 struct vnode *lowervp = xp->umap_lowervp;
406 /* After this assignment, this node will not be re-used. */
408 umap_node_delete(xp);
409 xp->umap_lowervp = NULL;
416 * umap_print(struct vop_print_args *ap)
419 umap_print(struct vop_print_args *ap)
421 struct vnode *vp = ap->a_vp;
422 printf("\ttag VT_UMAPFS, vp=%p, lowervp=%p\n", vp, UMAPVPTOLOWERVP(vp));
427 * umap_rename(struct vnode *a_fdvp, struct vnode *a_fvp,
428 * struct componentname *a_fcnp, struct vnode *a_tdvp,
429 * struct vnode *a_tvp, struct componentname *a_tcnp)
432 umap_rename(struct vop_old_rename_args *ap)
435 struct componentname *compnamep;
436 struct ucred *compcredp, *savecompcredp;
440 * Rename is irregular, having two componentname structures.
441 * We need to map the cre in the second structure,
442 * and then bypass takes care of the rest.
446 compnamep = ap->a_tcnp;
447 compcredp = compnamep->cn_cred;
449 savecompcredp = compcredp;
450 compcredp = compnamep->cn_cred = crdup(savecompcredp);
452 if (umap_bug_bypass && compcredp->cr_uid != 0)
454 "umap_rename: rename component credit user was %lu, group %lu\n",
455 (u_long)compcredp->cr_uid, (u_long)compcredp->cr_gid);
457 /* Map all ids in the credential structure. */
459 umap_mapids(vp->v_mount, compcredp);
461 if (umap_bug_bypass && compcredp->cr_uid != 0)
463 "umap_rename: rename component credit user now %lu, group %lu\n",
464 (u_long)compcredp->cr_uid, (u_long)compcredp->cr_gid);
466 error = umap_bypass(&ap->a_head);
468 /* Restore the additional mapped componentname cred structure. */
471 compnamep->cn_cred = savecompcredp;
477 * Global vfs data structures
480 * XXX - strategy, bwrite are hand coded currently. They should
481 * go away with a merged buffer/block cache.
484 struct vnodeopv_entry_desc umap_vnodeop_entries[] = {
485 { &vop_default_desc, (vnodeopv_entry_t) umap_bypass },
486 { &vop_getattr_desc, (vnodeopv_entry_t) umap_getattr },
487 { &vop_inactive_desc, (vnodeopv_entry_t) umap_inactive },
488 { &vop_lock_desc, (vnodeopv_entry_t) umap_lock },
489 { &vop_print_desc, (vnodeopv_entry_t) umap_print },
490 { &vop_reclaim_desc, (vnodeopv_entry_t) umap_reclaim },
491 { &vop_old_rename_desc, (vnodeopv_entry_t) umap_rename },
492 { &vop_unlock_desc, (vnodeopv_entry_t) umap_unlock },