2 * Copyright (c) 1992, 1993, 1995
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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18 * This product includes software developed by the University of
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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
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>
56 static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
58 static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
60 static int umapfs_checkexp __P((struct mount *mp, struct sockaddr *nam,
61 int *extflagsp, struct ucred **credanonp));
62 static int umapfs_mount __P((struct mount *mp, char *path, caddr_t data,
63 struct nameidata *ndp, struct proc *p));
64 static int umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
65 caddr_t arg, struct proc *p));
66 static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
67 static int umapfs_start __P((struct mount *mp, int flags, struct proc *p));
68 static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
70 static int umapfs_sync __P((struct mount *mp, int waitfor,
71 struct ucred *cred, struct proc *p));
72 static int umapfs_unmount __P((struct mount *mp, int mntflags,
74 static int umapfs_vget __P((struct mount *mp, ino_t ino,
76 static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
82 umapfs_mount(mp, path, data, ndp, p)
86 struct nameidata *ndp;
89 struct umap_args args;
90 struct vnode *lowerrootvp, *vp;
91 struct vnode *umapm_rootvp;
92 struct umap_mount *amp;
102 if ((error = suser(p)) != 0)
106 printf("umapfs_mount(mp = %p)\n", (void *)mp);
112 if (mp->mnt_flag & MNT_UPDATE) {
114 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
120 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
127 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
128 UIO_USERSPACE, args.target, p);
134 * Sanity check on lower vnode
136 lowerrootvp = ndp->ni_vp;
138 printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
143 if (lowerrootvp->v_type != VDIR) {
149 printf("mp = %p\n", (void *)mp);
152 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
153 M_UMAPFSMNT, M_WAITOK); /* XXX */
156 * Save reference to underlying FS
158 amp->umapm_vfs = lowerrootvp->v_mount;
161 * Now copy in the number of entries and maps for umap mapping.
163 amp->info_nentries = args.nentries;
164 amp->info_gnentries = args.gnentries;
165 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
166 2*sizeof(u_long)*args.nentries);
171 printf("umap_mount:nentries %d\n",args.nentries);
172 for (i = 0; i < args.nentries; i++)
173 printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
174 amp->info_mapdata[i][1]);
177 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
178 2*sizeof(u_long)*args.gnentries);
183 printf("umap_mount:gnentries %d\n",args.gnentries);
184 for (i = 0; i < args.gnentries; i++)
185 printf(" group %lu maps to %lu\n",
186 amp->info_gmapdata[i][0],
187 amp->info_gmapdata[i][1]);
192 * Save reference. Each mount also holds
193 * a reference on the root vnode.
195 error = umap_node_create(mp, lowerrootvp, &vp);
197 * Unlock the node (either the lower or the alias)
199 VOP_UNLOCK(vp, 0, p);
201 * Make sure the node alias worked
205 free(amp, M_UMAPFSMNT); /* XXX */
210 * Keep a held reference to the root vnode.
211 * It is vrele'd in umapfs_unmount.
214 umapm_rootvp->v_flag |= VROOT;
215 amp->umapm_rootvp = umapm_rootvp;
216 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
217 mp->mnt_flag |= MNT_LOCAL;
218 mp->mnt_data = (qaddr_t) amp;
221 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
222 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
223 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
225 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
226 (void)umapfs_statfs(mp, &mp->mnt_stat, p);
228 printf("umapfs_mount: lower %s, alias at %s\n",
229 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
235 * VFS start. Nothing needed here - the start routine
236 * on the underlying filesystem will have been called
237 * when that filesystem was mounted.
240 umapfs_start(mp, flags, p)
246 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
250 * Free reference to umap layer
253 umapfs_unmount(mp, mntflags, p)
258 struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
263 printf("umapfs_unmount(mp = %p)\n", (void *)mp);
266 if (mntflags & MNT_FORCE)
270 * Clear out buffer cache. I don't think we
271 * ever get anything cached at this level at the
272 * moment, but who knows...
276 if (mntinvalbuf(mp, 1))
279 if (umapm_rootvp->v_usecount > 1)
281 error = vflush(mp, umapm_rootvp, flags);
286 vprint("alias root of lower", umapm_rootvp);
289 * Release reference on underlying root vnode
293 * And blow it away for future re-use
297 * Finally, throw away the umap_mount structure
299 free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
309 struct proc *p = curproc; /* XXX */
313 printf("umapfs_root(mp = %p, vp = %p->%p)\n",
314 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
315 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
319 * Return locked reference to root.
321 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
323 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
329 umapfs_quotactl(mp, cmd, uid, arg, p)
336 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
340 umapfs_statfs(mp, sbp, p)
349 printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
350 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
351 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
354 bzero(&mstat, sizeof(mstat));
356 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
360 /* now copy across the "interesting" information and fake the rest */
361 sbp->f_type = mstat.f_type;
362 sbp->f_flags = mstat.f_flags;
363 sbp->f_bsize = mstat.f_bsize;
364 sbp->f_iosize = mstat.f_iosize;
365 sbp->f_blocks = mstat.f_blocks;
366 sbp->f_bfree = mstat.f_bfree;
367 sbp->f_bavail = mstat.f_bavail;
368 sbp->f_files = mstat.f_files;
369 sbp->f_ffree = mstat.f_ffree;
370 if (sbp != &mp->mnt_stat) {
371 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
372 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
373 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
379 umapfs_sync(mp, waitfor, cred, p)
386 * XXX - Assumes no data cached at umap layer.
392 umapfs_vget(mp, ino, vpp)
398 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
402 umapfs_fhtovp(mp, fidp, vpp)
408 return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
412 umapfs_checkexp(mp, nam, exflagsp, credanonp)
414 struct sockaddr *nam;
416 struct ucred **credanonp;
419 return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
420 exflagsp, credanonp));
424 umapfs_vptofh(vp, fhp)
428 return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
431 static struct vfsops umap_vfsops = {
446 VFS_SET(umap_vfsops, umap, VFCF_LOOPBACK);