AMD64 - Fix many compile-time warnings. int/ptr type mismatches, %llx, etc.
[dragonfly.git] / sys / vfs / nullfs / null_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 * Jan-Simon Pendry.
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 * @(#)null_vfsops.c 8.2 (Berkeley) 1/21/94
37 *
38 * @(#)lofs_vfsops.c 1.2 (Berkeley) 6/18/92
39 * $FreeBSD: src/sys/miscfs/nullfs/null_vfsops.c,v 1.35.2.3 2001/07/26 20:37:11 iedowse Exp $
67863d04 40 * $DragonFly: src/sys/vfs/nullfs/null_vfsops.c,v 1.31 2008/09/17 21:44:25 dillon Exp $
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41 */
42
43/*
44 * Null Layer
45 * (See null_vnops.c for a description of what this does.)
46 */
47
48#include <sys/param.h>
49#include <sys/systm.h>
50#include <sys/kernel.h>
51#include <sys/proc.h>
52#include <sys/malloc.h>
53#include <sys/vnode.h>
54#include <sys/mount.h>
fad57d0e 55#include <sys/nlookup.h>
67863d04 56#include <sys/mountctl.h>
1f2de5d4 57#include "null.h"
984263bc 58
66a1ddf5 59extern struct vop_ops null_vnode_vops;
0961aa92 60
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61static MALLOC_DEFINE(M_NULLFSMNT, "NULLFS mount", "NULLFS mount structure");
62
984263bc 63static int nullfs_root(struct mount *mp, struct vnode **vpp);
984263bc 64static int nullfs_statfs(struct mount *mp, struct statfs *sbp,
acde96db 65 struct ucred *cred);
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66
67/*
68 * Mount null layer
69 */
70static int
acde96db 71nullfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
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72{
73 int error = 0;
74 struct null_args args;
8cb8b61a 75 struct vnode *rootvp;
984263bc 76 struct null_mount *xmp;
973c11b9 77 size_t size;
fad57d0e 78 struct nlookupdata nd;
67863d04 79 fhandle_t fh;
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80
81 NULLFSDEBUG("nullfs_mount(mp = %p)\n", (void *)mp);
82
83 /*
84 * Update is a no-op
85 */
86 if (mp->mnt_flag & MNT_UPDATE) {
87 return (EOPNOTSUPP);
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88 }
89
90 /*
91 * Get argument
92 */
93 error = copyin(data, (caddr_t)&args, sizeof(struct null_args));
94 if (error)
95 return (error);
96
97 /*
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98 * Find lower node
99 */
8cb8b61a 100 rootvp = NULL;
fad57d0e 101 error = nlookup_init(&nd, args.target, UIO_USERSPACE, NLC_FOLLOW);
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102 if (error)
103 goto fail1;
104 error = nlookup(&nd);
105 if (error)
106 goto fail2;
107 error = cache_vget(&nd.nl_nch, nd.nl_cred, LK_EXCLUSIVE, &rootvp);
108 if (error)
109 goto fail2;
984263bc 110
77652cad 111 xmp = (struct null_mount *) kmalloc(sizeof(struct null_mount),
67863d04 112 M_NULLFSMNT, M_WAITOK | M_ZERO);
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113
114 /*
115 * Save reference to underlying FS
28623bf9 116 *
8cb8b61a 117 * As lite stacking enters the scene, the old way of doing this
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118 * -- via the vnode -- is not good enough anymore. Use the
119 * underlying filesystem's namecache handle as our mount point
120 * root, adjusting the mount to point to us.
121 *
122 * NCF_ISMOUNTPT is normally set on the mount point, but we also
123 * want to set it on the base directory being mounted to prevent
124 * that directory from being destroyed out from under the nullfs
125 * mount.
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126 *
127 * The forwarding mount pointer (xmp->nullm_vfs) must be set to
128 * the actual target filesystem. If the target filesystem was
129 * resolved via a nullfs mount nd.nl_nch.mount will be pointing
130 * to the nullfs mount structure instead of the target filesystem,
131 * which would otherwise cause the mount VOPS and VFSOPS to recurse
132 * endlessly. If we are mounting via a nullfs mount we inherit
133 * its read-only state, if set.
8cb8b61a 134 */
28623bf9 135 xmp->nullm_vfs = nd.nl_nch.mount;
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136 if (xmp->nullm_vfs != rootvp->v_mount) {
137 if (xmp->nullm_vfs->mnt_flag & MNT_RDONLY)
138 mp->mnt_flag |= MNT_RDONLY;
139 xmp->nullm_vfs = rootvp->v_mount;
140 }
141
142 /*
143 * ncmountpt is the parent glue. When mounting a nullfs via a nullfs
144 * we retain the parent nullfs to create a unique chain tuple.
145 */
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146 mp->mnt_ncmountpt = nd.nl_nch;
147 cache_changemount(&mp->mnt_ncmountpt, mp);
148 mp->mnt_ncmountpt.ncp->nc_flag |= NCF_ISMOUNTPT;
149 cache_unlock(&mp->mnt_ncmountpt);
150 cache_zero(&nd.nl_nch);
8cb8b61a 151 nlookup_done(&nd);
984263bc 152
66a1ddf5 153 vfs_add_vnodeops(mp, &null_vnode_vops, &mp->mnt_vn_norm_ops);
0961aa92 154
28623bf9 155 vn_unlock(rootvp); /* leave reference intact */
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156
157 /*
158 * Keep a held reference to the root vnode.
159 * It is vrele'd in nullfs_unmount.
160 */
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161 xmp->nullm_rootvp = rootvp;
162 /*
163 * XXX What's the proper safety condition for querying
164 * the underlying mount? Is this flag tuning necessary
165 * at all?
166 */
167 if (xmp->nullm_vfs->mnt_flag & MNT_LOCAL)
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168 mp->mnt_flag |= MNT_LOCAL;
169 mp->mnt_data = (qaddr_t) xmp;
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170
171 /*
172 * Try to create a unique but non-random fsid for the nullfs to
173 * allow it to be exported via NFS.
174 */
175 bzero(&fh, sizeof(fh));
176 fh.fh_fsid = rootvp->v_mount->mnt_stat.f_fsid;
177 if (VFS_VPTOFH(rootvp, &fh.fh_fid) == 0) {
178 fh.fh_fsid.val[1] ^= crc32(&fh.fh_fid, sizeof(fh.fh_fid));
179 vfs_setfsid(mp, &fh.fh_fsid);
180 } else {
181 vfs_getnewfsid(mp);
182 }
984263bc 183
984263bc 184 (void) copyinstr(args.target, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
973c11b9 185 &size);
984263bc 186 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
acde96db 187 (void)nullfs_statfs(mp, &mp->mnt_stat, cred);
984263bc 188 NULLFSDEBUG("nullfs_mount: lower %s, alias at %s\n",
75ffff0d 189 mp->mnt_stat.f_mntfromname, mp->mnt_stat.f_mntfromname);
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190
191 /*
192 * So unmount won't complain about namecache refs still existing
193 */
194 mp->mnt_kern_flag |= MNTK_NCALIASED;
984263bc 195 return (0);
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196fail2:
197 nlookup_done(&nd);
198fail1:
199 return (error);
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200}
201
202/*
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203 * Free reference to null layer
204 */
205static int
acde96db 206nullfs_unmount(struct mount *mp, int mntflags)
984263bc 207{
b81dacf0 208 struct null_mount *xmp;
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209 int flags = 0;
210
211 NULLFSDEBUG("nullfs_unmount: mp = %p\n", (void *)mp);
212
213 if (mntflags & MNT_FORCE)
214 flags |= FORCECLOSE;
215
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216 /*
217 * Finally, throw away the null_mount structure
218 */
8e77d370 219 xmp = (void *)mp->mnt_data;
984263bc 220 mp->mnt_data = 0;
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221 if (xmp->nullm_rootvp) {
222 vrele(xmp->nullm_rootvp);
223 xmp->nullm_rootvp = NULL;
224 }
225 kfree(xmp, M_NULLFSMNT);
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226 return 0;
227}
228
229static int
dadab5e9 230nullfs_root(struct mount *mp, struct vnode **vpp)
984263bc 231{
984263bc 232 struct vnode *vp;
44b1cf3d 233 int error;
984263bc 234
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235 NULLFSDEBUG("nullfs_root(mp = %p, vp = %p)\n", (void *)mp,
236 (void *)MOUNTTONULLMOUNT(mp)->nullm_rootvp);
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237
238 /*
239 * Return locked reference to root.
240 */
241 vp = MOUNTTONULLMOUNT(mp)->nullm_rootvp;
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242 error = vget(vp, LK_EXCLUSIVE | LK_RETRY);
243 if (error == 0)
244 *vpp = vp;
245 return (error);
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246}
247
248static int
f4a3189a 249nullfs_quotactl(struct mount *mp, int cmd, uid_t uid, caddr_t arg,
acde96db 250 struct ucred *cred)
984263bc 251{
acde96db 252 return VFS_QUOTACTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, uid, arg, cred);
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253}
254
255static int
acde96db 256nullfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
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257{
258 int error;
259 struct statfs mstat;
260
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261 NULLFSDEBUG("nullfs_statfs(mp = %p, vp = %p)\n", (void *)mp,
262 (void *)MOUNTTONULLMOUNT(mp)->nullm_rootvp);
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263
264 bzero(&mstat, sizeof(mstat));
265
acde96db 266 error = VFS_STATFS(MOUNTTONULLMOUNT(mp)->nullm_vfs, &mstat, cred);
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267 if (error)
268 return (error);
269
270 /* now copy across the "interesting" information and fake the rest */
271 sbp->f_type = mstat.f_type;
272 sbp->f_flags = mstat.f_flags;
273 sbp->f_bsize = mstat.f_bsize;
274 sbp->f_iosize = mstat.f_iosize;
275 sbp->f_blocks = mstat.f_blocks;
276 sbp->f_bfree = mstat.f_bfree;
277 sbp->f_bavail = mstat.f_bavail;
278 sbp->f_files = mstat.f_files;
279 sbp->f_ffree = mstat.f_ffree;
280 if (sbp != &mp->mnt_stat) {
281 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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282 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
283 }
284 return (0);
285}
286
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287/*
288 * Implement NFS export tracking
289 */
984263bc 290static int
f4a3189a
CP
291nullfs_checkexp(struct mount *mp, struct sockaddr *nam, int *extflagsp,
292 struct ucred **credanonp)
984263bc 293{
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294 struct null_mount *xmp = (void *)mp->mnt_data;
295 struct netcred *np;
296 int error;
984263bc 297
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298 np = vfs_export_lookup(mp, &xmp->export, nam);
299 if (np) {
300 *extflagsp = np->netc_exflags;
301 *credanonp = &np->netc_anon;
302 error = 0;
303 } else {
304 error = EACCES;
305 }
306 return(error);
307#if 0
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308 return VFS_CHECKEXP(MOUNTTONULLMOUNT(mp)->nullm_vfs, nam,
309 extflagsp, credanonp);
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310#endif
311}
312
313int
314nullfs_export(struct mount *mp, int op, const struct export_args *export)
315{
316 struct null_mount *xmp = (void *)mp->mnt_data;
317 int error;
318
319 switch(op) {
320 case MOUNTCTL_SET_EXPORT:
321 error = vfs_export(mp, &xmp->export, export);
322 break;
323 default:
324 error = EOPNOTSUPP;
325 break;
326 }
327 return(error);
328}
329
330/*
331 * Pass through file handle conversion functions.
332 */
333static int
334nullfs_vptofh(struct vnode *vp, struct fid *fhp)
335{
336 return VFS_VPTOFH(vp, fhp);
337}
338
339/*
340 * Pass through file handle conversion functions.
341 *
342 * NOTE: currently only HAMMER uses rootvp. HAMMER uses rootvp only
343 * to enforce PFS isolation.
344 */
345static int
346nullfs_fhtovp(struct mount *mp, struct vnode *rootvp,
347 struct fid *fhp, struct vnode **vpp)
348{
349 struct null_mount *xmp = MOUNTTONULLMOUNT(mp);
350
351 return VFS_FHTOVP(xmp->nullm_vfs, xmp->nullm_rootvp, fhp, vpp);
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352}
353
984263bc 354static int
f4a3189a 355nullfs_extattrctl(struct mount *mp, int cmd, const char *attrname, caddr_t arg,
acde96db 356 struct ucred *cred)
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357{
358 return VFS_EXTATTRCTL(MOUNTTONULLMOUNT(mp)->nullm_vfs, cmd, attrname,
acde96db 359 arg, cred);
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360}
361
362
363static struct vfsops null_vfsops = {
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364 .vfs_mount = nullfs_mount,
365 .vfs_unmount = nullfs_unmount,
366 .vfs_root = nullfs_root,
367 .vfs_quotactl = nullfs_quotactl,
368 .vfs_statfs = nullfs_statfs,
369 .vfs_sync = vfs_stdsync,
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370 .vfs_extattrctl = nullfs_extattrctl,
371 .vfs_fhtovp = nullfs_fhtovp,
372 .vfs_vptofh = nullfs_vptofh,
373 .vfs_checkexp = nullfs_checkexp
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374};
375
376VFS_SET(null_vfsops, null, VFCF_LOOPBACK);