proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[dragonfly.git] / sys / vfs / umapfs / umap_vfsops.c
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1/*
2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * the UCLA Ficus project.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * @(#)umap_vfsops.c 8.8 (Berkeley) 5/14/95
37 *
38 * $FreeBSD: src/sys/miscfs/umapfs/umap_vfsops.c,v 1.31.2.2 2001/09/11 09:49:53 kris Exp $
dadab5e9 39 * $DragonFly: src/sys/vfs/umapfs/Attic/umap_vfsops.c,v 1.4 2003/06/25 03:56:01 dillon Exp $
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40 */
41
42/*
43 * Umap Layer
44 * (See mount_umap(8) for a description of this layer.)
45 */
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/proc.h>
51#include <sys/vnode.h>
52#include <sys/mount.h>
53#include <sys/namei.h>
54#include <sys/malloc.h>
55#include <miscfs/umapfs/umap.h>
56#include <vm/vm_zone.h>
57
58static MALLOC_DEFINE(M_UMAPFSMNT, "UMAP mount", "UMAP mount structure");
59
60static int umapfs_fhtovp __P((struct mount *mp, struct fid *fidp,
61 struct vnode **vpp));
62static int umapfs_checkexp __P((struct mount *mp, struct sockaddr *nam,
63 int *extflagsp, struct ucred **credanonp));
64static int umapfs_mount __P((struct mount *mp, char *path, caddr_t data,
dadab5e9 65 struct nameidata *ndp, struct thread *td));
984263bc 66static int umapfs_quotactl __P((struct mount *mp, int cmd, uid_t uid,
dadab5e9 67 caddr_t arg, struct thread *td));
984263bc 68static int umapfs_root __P((struct mount *mp, struct vnode **vpp));
dadab5e9 69static int umapfs_start __P((struct mount *mp, int flags, struct thread *td));
984263bc 70static int umapfs_statfs __P((struct mount *mp, struct statfs *sbp,
dadab5e9 71 struct thread *td));
984263bc 72static int umapfs_sync __P((struct mount *mp, int waitfor,
dadab5e9 73 struct ucred *cred, struct thread *td));
984263bc 74static int umapfs_unmount __P((struct mount *mp, int mntflags,
dadab5e9 75 struct thread *td));
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76static int umapfs_vget __P((struct mount *mp, ino_t ino,
77 struct vnode **vpp));
78static int umapfs_vptofh __P((struct vnode *vp, struct fid *fhp));
79static int umapfs_extattrctl __P((struct mount *mp, int cmd,
80 const char *attrname, caddr_t arg,
dadab5e9 81 struct thread *td));
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82
83/*
84 * Mount umap layer
85 */
86static int
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87umapfs_mount(struct mount *mp, char *path, caddr_t data,
88 struct nameidata *ndp, struct thread *td)
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89{
90 struct umap_args args;
91 struct vnode *lowerrootvp, *vp;
92 struct vnode *umapm_rootvp;
93 struct umap_mount *amp;
94 u_int size;
95 int error;
96#ifdef DEBUG
97 int i;
98#endif
99
100 /*
101 * Only for root
102 */
dadab5e9 103 if ((error = suser(td)) != 0)
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104 return (error);
105
106#ifdef DEBUG
107 printf("umapfs_mount(mp = %p)\n", (void *)mp);
108#endif
109
110 /*
111 * Update is a no-op
112 */
113 if (mp->mnt_flag & MNT_UPDATE) {
114 return (EOPNOTSUPP);
dadab5e9 115 /* return (VFS_MOUNT(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, path, data, ndp, td));*/
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116 }
117
118 /*
119 * Get argument
120 */
121 error = copyin(data, (caddr_t)&args, sizeof(struct umap_args));
122 if (error)
123 return (error);
124
125 /*
126 * Find lower node
127 */
128 NDINIT(ndp, LOOKUP, FOLLOW|WANTPARENT|LOCKLEAF,
dadab5e9 129 UIO_USERSPACE, args.target, td);
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130 error = namei(ndp);
131 if (error)
132 return (error);
133 NDFREE(ndp, NDF_ONLY_PNBUF);
134
135 /*
136 * Sanity check on lower vnode
137 */
138 lowerrootvp = ndp->ni_vp;
139#ifdef DEBUG
140 printf("vp = %p, check for VDIR...\n", (void *)lowerrootvp);
141#endif
142 vrele(ndp->ni_dvp);
143 ndp->ni_dvp = 0;
144
145 if (lowerrootvp->v_type != VDIR) {
146 vput(lowerrootvp);
147 return (EINVAL);
148 }
149
150#ifdef DEBUG
151 printf("mp = %p\n", (void *)mp);
152#endif
153
154 amp = (struct umap_mount *) malloc(sizeof(struct umap_mount),
155 M_UMAPFSMNT, M_WAITOK); /* XXX */
156
157 /*
158 * Save reference to underlying FS
159 */
160 amp->umapm_vfs = lowerrootvp->v_mount;
161
162 /*
163 * Now copy in the number of entries and maps for umap mapping.
164 */
165 if (args.nentries > MAPFILEENTRIES || args.gnentries >
166 GMAPFILEENTRIES) {
167 vput(lowerrootvp);
168 return (error);
169 }
170
171 amp->info_nentries = args.nentries;
172 amp->info_gnentries = args.gnentries;
173 error = copyin(args.mapdata, (caddr_t)amp->info_mapdata,
174 2*sizeof(u_long)*args.nentries);
175 if (error)
176 return (error);
177
178#ifdef DEBUG
179 printf("umap_mount:nentries %d\n",args.nentries);
180 for (i = 0; i < args.nentries; i++)
181 printf(" %lu maps to %lu\n", amp->info_mapdata[i][0],
182 amp->info_mapdata[i][1]);
183#endif
184
185 error = copyin(args.gmapdata, (caddr_t)amp->info_gmapdata,
186 2*sizeof(u_long)*args.gnentries);
187 if (error)
188 return (error);
189
190#ifdef DEBUG
191 printf("umap_mount:gnentries %d\n",args.gnentries);
192 for (i = 0; i < args.gnentries; i++)
193 printf(" group %lu maps to %lu\n",
194 amp->info_gmapdata[i][0],
195 amp->info_gmapdata[i][1]);
196#endif
197
198
199 /*
200 * Save reference. Each mount also holds
201 * a reference on the root vnode.
202 */
203 error = umap_node_create(mp, lowerrootvp, &vp);
204 /*
205 * Unlock the node (either the lower or the alias)
206 */
dadab5e9 207 VOP_UNLOCK(vp, 0, td);
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208 /*
209 * Make sure the node alias worked
210 */
211 if (error) {
212 vrele(lowerrootvp);
213 free(amp, M_UMAPFSMNT); /* XXX */
214 return (error);
215 }
216
217 /*
218 * Keep a held reference to the root vnode.
219 * It is vrele'd in umapfs_unmount.
220 */
221 umapm_rootvp = vp;
222 umapm_rootvp->v_flag |= VROOT;
223 amp->umapm_rootvp = umapm_rootvp;
224 if (UMAPVPTOLOWERVP(umapm_rootvp)->v_mount->mnt_flag & MNT_LOCAL)
225 mp->mnt_flag |= MNT_LOCAL;
226 mp->mnt_data = (qaddr_t) amp;
227 vfs_getnewfsid(mp);
228
229 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
230 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
231 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
232 &size);
233 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
dadab5e9 234 (void)umapfs_statfs(mp, &mp->mnt_stat, td);
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235#ifdef DEBUG
236 printf("umapfs_mount: lower %s, alias at %s\n",
237 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntonname);
238#endif
239 return (0);
240}
241
242/*
243 * VFS start. Nothing needed here - the start routine
244 * on the underlying filesystem will have been called
245 * when that filesystem was mounted.
246 */
247static int
dadab5e9 248umapfs_start(struct mount *mp, int flags, struct thread *td)
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249{
250 return (0);
251 /* return (VFS_START(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, flags, p)); */
252}
253
254/*
255 * Free reference to umap layer
256 */
257static int
dadab5e9 258umapfs_unmount(struct mount *mp, int mntflags, struct thread *td)
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259{
260 int error;
261 int flags = 0;
262
263#ifdef DEBUG
264 printf("umapfs_unmount(mp = %p)\n", (void *)mp);
265#endif
266
267 if (mntflags & MNT_FORCE)
268 flags |= FORCECLOSE;
269
270 /*
271 * Clear out buffer cache. I don't think we
272 * ever get anything cached at this level at the
273 * moment, but who knows...
274 */
275#ifdef notyet
276 mntflushbuf(mp, 0);
277 if (mntinvalbuf(mp, 1))
278 return (EBUSY);
279#endif
280 /* There is 1 extra root vnode reference (umapm_rootvp). */
281 error = vflush(mp, 1, flags);
282 if (error)
283 return (error);
284
285 /*
286 * Finally, throw away the umap_mount structure
287 */
288 free(mp->mnt_data, M_UMAPFSMNT); /* XXX */
289 mp->mnt_data = 0;
290 return (0);
291}
292
293static int
dadab5e9 294umapfs_root(struct mount *mp, struct vnode **vpp)
984263bc 295{
dadab5e9 296 struct thread *td = curthread; /* XXX */
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297 struct vnode *vp;
298
299#ifdef DEBUG
300 printf("umapfs_root(mp = %p, vp = %p->%p)\n",
301 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
302 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
303#endif
304
305 /*
306 * Return locked reference to root.
307 */
308 vp = MOUNTTOUMAPMOUNT(mp)->umapm_rootvp;
309 VREF(vp);
dadab5e9 310 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, td);
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311 *vpp = vp;
312 return (0);
313}
314
315static int
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316umapfs_quotactl(struct mount *mp, int cmd, uid_t uid,
317 caddr_t arg, struct thread *td)
984263bc 318{
dadab5e9 319 return (VFS_QUOTACTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, uid, arg, td));
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320}
321
322static int
dadab5e9 323umapfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
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324{
325 int error;
326 struct statfs mstat;
327
328#ifdef DEBUG
329 printf("umapfs_statfs(mp = %p, vp = %p->%p)\n",
330 (void *)mp, (void *)MOUNTTOUMAPMOUNT(mp)->umapm_rootvp,
331 (void *)UMAPVPTOLOWERVP(MOUNTTOUMAPMOUNT(mp)->umapm_rootvp));
332#endif
333
334 bzero(&mstat, sizeof(mstat));
335
dadab5e9 336 error = VFS_STATFS(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, &mstat, td);
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337 if (error)
338 return (error);
339
340 /* now copy across the "interesting" information and fake the rest */
341 sbp->f_type = mstat.f_type;
342 sbp->f_flags = mstat.f_flags;
343 sbp->f_bsize = mstat.f_bsize;
344 sbp->f_iosize = mstat.f_iosize;
345 sbp->f_blocks = mstat.f_blocks;
346 sbp->f_bfree = mstat.f_bfree;
347 sbp->f_bavail = mstat.f_bavail;
348 sbp->f_files = mstat.f_files;
349 sbp->f_ffree = mstat.f_ffree;
350 if (sbp != &mp->mnt_stat) {
351 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
352 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
353 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
354 }
355 return (0);
356}
357
358static int
dadab5e9 359umapfs_sync(struct mount *mp, int waitfor, struct ucred *cred, struct thread *td)
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360{
361 /*
362 * XXX - Assumes no data cached at umap layer.
363 */
364 return (0);
365}
366
367static int
dadab5e9 368umapfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
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369{
370
371 return (VFS_VGET(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, ino, vpp));
372}
373
374static int
dadab5e9 375umapfs_fhtovp(struct mount *mp, struct fid *fidp, struct vnode **vpp)
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376{
377
378 return (VFS_FHTOVP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, fidp, vpp));
379}
380
381static int
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382umapfs_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
383 struct ucred **credanonp)
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384{
385
386 return (VFS_CHECKEXP(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, nam,
387 exflagsp, credanonp));
388}
389
390static int
dadab5e9 391umapfs_vptofh(struct vnode *vp, struct fid *fhp)
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392{
393 return (VFS_VPTOFH(UMAPVPTOLOWERVP(vp), fhp));
394}
395
396static int
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397umapfs_extattrctl(struct mount *mp, int cmd, const char *attrname,
398 caddr_t arg, struct thread *td)
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399{
400 return (VFS_EXTATTRCTL(MOUNTTOUMAPMOUNT(mp)->umapm_vfs, cmd, attrname,
dadab5e9 401 arg, td));
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402}
403
404
405static struct vfsops umap_vfsops = {
406 umapfs_mount,
407 umapfs_start,
408 umapfs_unmount,
409 umapfs_root,
410 umapfs_quotactl,
411 umapfs_statfs,
412 umapfs_sync,
413 umapfs_vget,
414 umapfs_fhtovp,
415 umapfs_checkexp,
416 umapfs_vptofh,
417 umapfs_init,
418 vfs_stduninit,
419 umapfs_extattrctl,
420};
421
422VFS_SET(umap_vfsops, umap, VFCF_LOOPBACK);