2 * Copyright (c) 1992, 1993, 1995
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5 * This code is derived from software donated to Berkeley by
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36 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
38 * $Id: umap_vfsops.c,v 1.21 1998/03/01 22:46:24 msmith 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>
56 static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
58 static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
59 struct sockaddr *nam, struct vnode **vpp,
60 int *exflagsp, struct ucred **credanonp));
61 static int umapfs_mount __P((struct mount *mp, char *path, caddr_t data,
62 struct nameidata *ndp, struct proc *p));
63 static int umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
64 caddr_t arg, struct proc *p));
65 static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
66 static int umapfs_start __P((struct mount *mp, int flags, struct proc *p));
67 static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
69 static int umapfs_sync __P((struct mount *mp, int waitfor,
70 struct ucred *cred, struct proc *p));
71 static int umapfs_unmount __P((struct mount *mp, int mntflags,
73 static int umapfs_vget __P((struct mount *mp, ino_t ino,
75 static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
81 umapfs_mount(mp, path, data, ndp, p)
85 struct nameidata *ndp;
88 struct umap_args args;
89 struct vnode *lowerrootvp, *vp;
90 struct vnode *umapm_rootvp;
91 struct umap_mount *amp;
94 #ifdef UMAP_DIAGNOSTIC
98 #ifdef UMAPFS_DIAGNOSTIC
99 printf("umapfs_mount(mp = %x)\n", mp);
105 if (mp->mnt_flag & MNT_UPDATE) {
107 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, p));*/
113 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
120 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
121 UIO_USERSPACE, args.target, p);
127 * Sanity check on lower vnode
129 lowerrootvp = ndp->ni_vp;
130 #ifdef UMAPFS_DIAGNOSTIC
131 printf("vp = %x, check for VDIR...\n", lowerrootvp);
136 if (lowerrootvp->v_type != VDIR) {
141 #ifdef UMAPFS_DIAGNOSTIC
142 printf("mp = %x\n", mp);
145 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
146 M_UMAPFSMNT, M_WAITOK); /* XXX */
149 * Save reference to underlying FS
151 amp->umapm_vfs = lowerrootvp->v_mount;
154 * Now copy in the number of entries and maps for umap mapping.
156 amp->info_nentries = args.nentries;
157 amp->info_gnentries = args.gnentries;
158 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
159 2*sizeof(u_long)*args.nentries);
163 #ifdef UMAP_DIAGNOSTIC
164 printf("umap_mount:nentries %d\n",args.nentries);
165 for (i = 0; i < args.nentries; i++)
166 printf(" %d maps to %d\n", amp->info_mapdata[i][0],
167 amp->info_mapdata[i][1]);
170 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
171 2*sizeof(u_long)*args.gnentries);
175 #ifdef UMAP_DIAGNOSTIC
176 printf("umap_mount:gnentries %d\n",args.gnentries);
177 for (i = 0; i < args.gnentries; i++)
178 printf(" group %d maps to %d\n",
179 amp->info_gmapdata[i][0],
180 amp->info_gmapdata[i][1]);
185 * Save reference. Each mount also holds
186 * a reference on the root vnode.
188 error = umap_node_create(mp, lowerrootvp, &vp);
190 * Unlock the node (either the lower or the alias)
192 VOP_UNLOCK(vp, 0, p);
194 * Make sure the node alias worked
198 free(amp, M_UMAPFSMNT); /* XXX */
203 * Keep a held reference to the root vnode.
204 * It is vrele'd in umapfs_unmount.
207 umapm_rootvp->v_flag |= VROOT;
208 amp->umapm_rootvp = umapm_rootvp;
209 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
210 mp->mnt_flag |= MNT_LOCAL;
211 mp->mnt_data = (qaddr_t) amp;
214 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
215 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
216 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
218 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
219 (void)umapfs_statfs(mp, &mp->mnt_stat, p);
220 #ifdef UMAPFS_DIAGNOSTIC
221 printf("umapfs_mount: lower %s, alias at %s\n",
222 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
228 * VFS start. Nothing needed here - the start routine
229 * on the underlying filesystem will have been called
230 * when that filesystem was mounted.
233 umapfs_start(mp, flags, p)
239 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
243 * Free reference to umap layer
246 umapfs_unmount(mp, mntflags, p)
251 struct vnode *umapm_rootvp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
255 #ifdef UMAPFS_DIAGNOSTIC
256 printf("umapfs_unmount(mp = %x)\n", mp);
259 if (mntflags & MNT_FORCE)
263 * Clear out buffer cache. I don't think we
264 * ever get anything cached at this level at the
265 * moment, but who knows...
269 if (mntinvalbuf(mp, 1))
272 if (umapm_rootvp->v_usecount > 1)
274 error = vflush(mp, umapm_rootvp, flags);
278 #ifdef UMAPFS_DIAGNOSTIC
279 vprint("alias root of lower", umapm_rootvp);
282 * Release reference on underlying root vnode
286 * And blow it away for future re-use
290 * Finally, throw away the umap_mount structure
292 free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
302 struct proc *p = curproc; /* XXX */
305 #ifdef UMAPFS_DIAGNOSTIC
306 printf("umapfs_root(mp = %x, vp = %x->%x)\n", mp,
307 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
308 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
313 * Return locked reference to root.
315 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
317 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
323 umapfs_quotactl(mp, cmd, uid, arg, p)
330 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, p));
334 umapfs_statfs(mp, sbp, p)
342 #ifdef UMAPFS_DIAGNOSTIC
343 printf("umapfs_statfs(mp = %x, vp = %x->%x)\n", mp,
344 MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
345 UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp)
349 bzero(&mstat, sizeof(mstat));
351 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, p);
355 /* now copy across the "interesting" information and fake the rest */
356 sbp->f_type = mstat.f_type;
357 sbp->f_flags = mstat.f_flags;
358 sbp->f_bsize = mstat.f_bsize;
359 sbp->f_iosize = mstat.f_iosize;
360 sbp->f_blocks = mstat.f_blocks;
361 sbp->f_bfree = mstat.f_bfree;
362 sbp->f_bavail = mstat.f_bavail;
363 sbp->f_files = mstat.f_files;
364 sbp->f_ffree = mstat.f_ffree;
365 if (sbp != &mp->mnt_stat) {
366 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
367 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
368 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
374 umapfs_sync(mp, waitfor, cred, p)
381 * XXX - Assumes no data cached at umap layer.
387 umapfs_vget(mp, ino, vpp)
393 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
397 umapfs_fhtovp(mp, fidp, nam, vpp, exflagsp, credanonp)
400 struct sockaddr *nam;
403 struct ucred**credanonp;
406 return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, nam, vpp, exflagsp,credanonp));
410 umapfs_vptofh(vp, fhp)
414 return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
417 static struct vfsops umap_vfsops = {
431 VFS_SET(umap_vfsops, umap, MOUNT_UMAP, VFCF_LOOPBACK);