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36 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
38 * $FreeBSD: src/sys/miscfs/umapfs/umap_vfsops.c,v 1.31.2.2 2001/09/11 09:49:53 kris Exp $
43 * (See mount_umap(8) for a description of this layer.)
46 #include <sys/param.h>
47 #include <sys/systm.h>
48 #include <sys/kernel.h>
50 #include <sys/vnode.h>
51 #include <sys/mount.h>
52 #include <sys/namei.h>
53 #include <sys/malloc.h>
54 #include <miscfs/umapfs/umap.h>
55 #include <vm/vm_zone.h>
57 static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
59 static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
61 static int umapfs_checkexp __P((struct mount *mp, struct sockaddr *nam,
62 int *extflagsp, struct ucred **credanonp));
63 static int umapfs_mount __P((struct mount *mp, char *path, caddr_t data,
64 struct nameidata *ndp, struct proc *p));
65 static int umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
66 caddr_t arg, struct proc *p));
67 static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
68 static int umapfs_start __P((struct mount *mp, int flags, struct proc *p));
69 static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
71 static int umapfs_sync __P((struct mount *mp, int waitfor,
72 struct ucred *cred, struct proc *p));
73 static int umapfs_unmount __P((struct mount *mp, int mntflags,
75 static int umapfs_vget __P((struct mount *mp, ino_t ino,
77 static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
78 static int umapfs_extattrctl __P((struct mount *mp, int cmd,
79 const char *attrname, caddr_t arg,
86 umapfs_mount(mp, path, data, ndp, p)
90 struct nameidata *ndp;
93 struct umap_args args;
94 struct vnode *lowerrootvp, *vp;
95 struct vnode *umapm_rootvp;
96 struct umap_mount *amp;
106 if ((error = suser(p)) != 0)
110 printf("umapfs_mount(mp = %p)\n", (void *)mp);
116 if (mp->mnt_flag & MNT_UPDATE) {
118 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
124 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
131 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
132 UIO_USERSPACE, args.target, p);
136 NDFREE(ndp, NDF_ONLY_PNBUF);
139 * Sanity check on lower vnode
141 lowerrootvp = ndp->ni_vp;
143 printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
148 if (lowerrootvp->v_type != VDIR) {
154 printf("mp = %p\n", (void *)mp);
157 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
158 M_UMAPFSMNT, M_WAITOK); /* XXX */
161 * Save reference to underlying FS
163 amp->umapm_vfs = lowerrootvp->v_mount;
166 * Now copy in the number of entries and maps for umap mapping.
168 if (args.nentries > MAPFILEENTRIES || args.gnentries >
174 amp->info_nentries = args.nentries;
175 amp->info_gnentries = args.gnentries;
176 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
177 2*sizeof(u_long)*args.nentries);
182 printf("umap_mount:nentries %d\n",args.nentries);
183 for (i = 0; i < args.nentries; i++)
184 printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
185 amp->info_mapdata[i][1]);
188 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
189 2*sizeof(u_long)*args.gnentries);
194 printf("umap_mount:gnentries %d\n",args.gnentries);
195 for (i = 0; i < args.gnentries; i++)
196 printf(" group %lu maps to %lu\n",
197 amp->info_gmapdata[i][0],
198 amp->info_gmapdata[i][1]);
203 * Save reference. Each mount also holds
204 * a reference on the root vnode.
206 error = umap_node_create(mp, lowerrootvp, &vp);
208 * Unlock the node (either the lower or the alias)
210 VOP_UNLOCK(vp, 0, p);
212 * Make sure the node alias worked
216 free(amp, M_UMAPFSMNT); /* XXX */
221 * Keep a held reference to the root vnode.
222 * It is vrele'd in umapfs_unmount.
225 umapm_rootvp->v_flag |= VROOT;
226 amp->umapm_rootvp = umapm_rootvp;
227 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
228 mp->mnt_flag |= MNT_LOCAL;
229 mp->mnt_data = (qaddr_t) amp;
232 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
233 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
234 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
236 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
237 (void)umapfs_statfs(mp, &mp->mnt_stat, p);
239 printf("umapfs_mount: lower %s, alias at %s\n",
240 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
246 * VFS start. Nothing needed here - the start routine
247 * on the underlying filesystem will have been called
248 * when that filesystem was mounted.
251 umapfs_start(mp, flags, p)
257 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
261 * Free reference to umap layer
264 umapfs_unmount(mp, mntflags, p)
273 printf("umapfs_unmount(mp = %p)\n", (void *)mp);
276 if (mntflags & MNT_FORCE)
280 * Clear out buffer cache. I don't think we
281 * ever get anything cached at this level at the
282 * moment, but who knows...
286 if (mntinvalbuf(mp, 1))
289 /* There is 1 extra root vnode reference (umapm_rootvp). */
290 error = vflush(mp, 1, flags);
295 * Finally, throw away the umap_mount structure
297 free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
307 struct proc *p = curproc; /* XXX */
311 printf("umapfs_root(mp = %p, vp = %p->%p)\n",
312 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
313 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
317 * Return locked reference to root.
319 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
321 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
327 umapfs_quotactl(mp, cmd, uid, arg, p)
334 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
338 umapfs_statfs(mp, sbp, p)
347 printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
348 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
349 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
352 bzero(&mstat, sizeof(mstat));
354 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
358 /* now copy across the "interesting" information and fake the rest */
359 sbp->f_type = mstat.f_type;
360 sbp->f_flags = mstat.f_flags;
361 sbp->f_bsize = mstat.f_bsize;
362 sbp->f_iosize = mstat.f_iosize;
363 sbp->f_blocks = mstat.f_blocks;
364 sbp->f_bfree = mstat.f_bfree;
365 sbp->f_bavail = mstat.f_bavail;
366 sbp->f_files = mstat.f_files;
367 sbp->f_ffree = mstat.f_ffree;
368 if (sbp != &mp->mnt_stat) {
369 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
370 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
371 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
377 umapfs_sync(mp, waitfor, cred, p)
384 * XXX - Assumes no data cached at umap layer.
390 umapfs_vget(mp, ino, vpp)
396 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
400 umapfs_fhtovp(mp, fidp, vpp)
406 return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
410 umapfs_checkexp(mp, nam, exflagsp, credanonp)
412 struct sockaddr *nam;
414 struct ucred **credanonp;
417 return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
418 exflagsp, credanonp));
422 umapfs_vptofh(vp, fhp)
426 return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
430 umapfs_extattrctl(mp, cmd, attrname, arg, p)
433 const char *attrname;
437 return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, attrname,
442 static struct vfsops umap_vfsops = {
459 VFS_SET(umap_vfsops, umap, VFCF_LOOPBACK);