Gur Zbba vf Jnavat Perfprag (19% bs Shyy)
Add a little layering experiment, which both exercises the componentname modification feature of libpuffs and tries to do layering (just a little too hardcoded for comfort, fow now). This simply uses the puffs nullfs to present all data and paths in rot13. You can even mount it twice for extra fun.
This commit is contained in:
pooka
parent
e6ea11c9c0
commit
b5da39fea6
11
share/examples/puffs/rot13fs/Makefile
Normal file
11
share/examples/puffs/rot13fs/Makefile
Normal file
@ -0,0 +1,11 @@
|
||||
# $NetBSD: Makefile,v 1.1 2007/01/15 00:46:29 pooka Exp $
|
||||
|
||||
PROG= rot13fs
|
||||
LDADD+= -lpuffs -lutil
|
||||
DBG=-g -O0
|
||||
|
||||
WARNS= 3
|
||||
|
||||
NOMAN= 1
|
||||
|
||||
.include <bsd.prog.mk>
|
||||
233
share/examples/puffs/rot13fs/rot13fs.c
Normal file
233
share/examples/puffs/rot13fs/rot13fs.c
Normal file
@ -0,0 +1,233 @@
|
||||
/* $NetBSD: rot13fs.c,v 1.1 2007/01/15 00:46:29 pooka Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 2007 Antti Kantee. All Rights Reserved.
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. Redistributions in binary form must reproduce the above copyright
|
||||
* notice, this list of conditions and the following disclaimer in the
|
||||
* documentation and/or other materials provided with the distribution.
|
||||
* 3. The name of the company nor the name of the author may be used to
|
||||
* endorse or promote products derived from this software without specific
|
||||
* prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
|
||||
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||||
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
|
||||
*/
|
||||
|
||||
/*
|
||||
* rot13fs: puffs layering experiment
|
||||
* (unfinished, as is probably fairly easy to tell)
|
||||
*/
|
||||
|
||||
#include <err.h>
|
||||
#include <errno.h>
|
||||
#include <puffs.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <unistd.h>
|
||||
|
||||
PUFFSOP_PROTOS(puffs_null) /* XXX */
|
||||
PUFFSOP_PROTOS(rot13)
|
||||
|
||||
static void usage(void);
|
||||
|
||||
static void
|
||||
usage()
|
||||
{
|
||||
|
||||
errx(1, "usage: %s [-s] [-o mntopts] rot13path mountpath",
|
||||
getprogname());
|
||||
}
|
||||
|
||||
static uint8_t tbl[256];
|
||||
|
||||
static void
|
||||
dorot13(void *buf, size_t buflen)
|
||||
{
|
||||
uint8_t *b = buf;
|
||||
|
||||
while (buflen--) {
|
||||
*b = tbl[*b];
|
||||
b++;
|
||||
}
|
||||
}
|
||||
|
||||
static int
|
||||
rot13path(struct puffs_usermount *pu, struct puffs_pathobj *base,
|
||||
struct puffs_cn *pcn)
|
||||
{
|
||||
|
||||
dorot13(pcn->pcn_name, pcn->pcn_namelen);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char *argv[])
|
||||
{
|
||||
struct puffs_usermount *pu;
|
||||
struct puffs_ops *pops;
|
||||
struct puffs_pathobj *po_root;
|
||||
struct statvfs svfsb;
|
||||
struct stat sb;
|
||||
mntoptparse_t mp;
|
||||
int mntflags, pflags, lflags;
|
||||
int ch;
|
||||
int i;
|
||||
|
||||
setprogname(argv[0]);
|
||||
|
||||
if (argc < 3)
|
||||
usage();
|
||||
|
||||
pflags = lflags = mntflags = 0;
|
||||
while ((ch = getopt(argc, argv, "o:s")) != -1) {
|
||||
switch (ch) {
|
||||
case 'o':
|
||||
mp = getmntopts(optarg, puffsmopts, &mntflags, &pflags);
|
||||
if (mp == NULL)
|
||||
err(1, "getmntopts");
|
||||
freemntopts(mp);
|
||||
break;
|
||||
case 's':
|
||||
lflags |= PUFFSLOOP_NODAEMON;
|
||||
break;
|
||||
}
|
||||
}
|
||||
pflags |= PUFFS_FLAG_BUILDPATH;
|
||||
argv += optind;
|
||||
argc -= optind;
|
||||
|
||||
if (pflags & PUFFS_FLAG_OPDUMP)
|
||||
lflags = PUFFSLOOP_NODAEMON;
|
||||
|
||||
if (argc != 2)
|
||||
usage();
|
||||
|
||||
PUFFSOP_INIT(pops);
|
||||
|
||||
PUFFSOP_SET(pops, puffs_null, fs, statvfs);
|
||||
PUFFSOP_SETFSNOP(pops, unmount);
|
||||
PUFFSOP_SETFSNOP(pops, sync);
|
||||
|
||||
PUFFSOP_SET(pops, rot13, node, readdir);
|
||||
PUFFSOP_SET(pops, rot13, node, read);
|
||||
PUFFSOP_SET(pops, rot13, node, write);
|
||||
|
||||
PUFFSOP_SET(pops, puffs_null, node, lookup);
|
||||
PUFFSOP_SET(pops, puffs_null, node, create);
|
||||
PUFFSOP_SET(pops, puffs_null, node, mknod);
|
||||
PUFFSOP_SET(pops, puffs_null, node, getattr);
|
||||
PUFFSOP_SET(pops, puffs_null, node, setattr);
|
||||
PUFFSOP_SET(pops, puffs_null, node, fsync);
|
||||
PUFFSOP_SET(pops, puffs_null, node, remove);
|
||||
PUFFSOP_SET(pops, puffs_null, node, link);
|
||||
PUFFSOP_SET(pops, puffs_null, node, rename);
|
||||
PUFFSOP_SET(pops, puffs_null, node, mkdir);
|
||||
PUFFSOP_SET(pops, puffs_null, node, rmdir);
|
||||
PUFFSOP_SET(pops, puffs_null, node, symlink);
|
||||
PUFFSOP_SET(pops, puffs_null, node, readlink);
|
||||
|
||||
if ((pu = puffs_mount(pops, argv[1], mntflags, "rot13", NULL,
|
||||
pflags, 0)) == NULL)
|
||||
err(1, "mount");
|
||||
|
||||
if (statvfs(argv[0], &svfsb) == -1)
|
||||
err(1, "statvfs %s", argv[0]);
|
||||
|
||||
pu->pu_pn_root = puffs_pn_new(pu, NULL);
|
||||
if (pu->pu_pn_root == NULL)
|
||||
err(1, "puffs_pn_new");
|
||||
|
||||
po_root = puffs_getrootpathobj(pu);
|
||||
if (po_root == NULL)
|
||||
err(1, "getrootpathobj");
|
||||
po_root->po_path = argv[0];
|
||||
po_root->po_len = strlen(argv[0]);
|
||||
|
||||
puffs_set_namemod(pu, rot13path);
|
||||
|
||||
if (stat(argv[0], &sb) == -1)
|
||||
err(1, "stat %s", argv[0]);
|
||||
puffs_stat2vattr(&pu->pu_pn_root->pn_va, &sb);
|
||||
|
||||
/* initialize rot13 tables */
|
||||
for (i = 0; i < 256; i++)
|
||||
tbl[i] = (uint8_t)i;
|
||||
for (i = 0; i <= 26; i++)
|
||||
tbl[i + 'a'] = 'a' + ((i + 13) % 26);
|
||||
for (i = 0; i < 26; i++)
|
||||
tbl[i + 'A'] = 'A' + ((i + 13) % 26);
|
||||
|
||||
if (puffs_start(pu, pu->pu_pn_root, &svfsb) == -1)
|
||||
err(1, "puffs_start");
|
||||
|
||||
if (puffs_mainloop(pu, lflags) == -1)
|
||||
err(1, "mainloop");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
rot13_node_readdir(struct puffs_cc *pcc, void *opc, struct dirent *dent,
|
||||
const struct puffs_cred *pcr, off_t *readoff, size_t *reslen)
|
||||
{
|
||||
struct dirent *dp;
|
||||
size_t rl;
|
||||
int rv;
|
||||
|
||||
dp = dent;
|
||||
rl = *reslen;
|
||||
|
||||
rv = puffs_null_node_readdir(pcc, opc, dent, pcr, readoff, reslen);
|
||||
if (rv)
|
||||
return rv;
|
||||
|
||||
while (rl > *reslen) {
|
||||
dorot13((uint8_t *)dp->d_name, dp->d_namlen);
|
||||
rl -= _DIRENT_SIZE(dp);
|
||||
dp = _DIRENT_NEXT(dp);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
rot13_node_read(struct puffs_cc *pcc, void *opc, uint8_t *buf, off_t offset,
|
||||
size_t *resid, const struct puffs_cred *pcr, int ioflag)
|
||||
{
|
||||
uint8_t *prebuf = buf;
|
||||
size_t preres = *resid;
|
||||
int rv;
|
||||
|
||||
rv = puffs_null_node_read(pcc, opc, buf, offset, resid, pcr, ioflag);
|
||||
if (rv)
|
||||
return rv;
|
||||
|
||||
dorot13(prebuf, preres - *resid);
|
||||
|
||||
return rv;
|
||||
}
|
||||
|
||||
int
|
||||
rot13_node_write(struct puffs_cc *pcc, void *opc, uint8_t *buf, off_t offset,
|
||||
size_t *resid, const struct puffs_cred *pcr, int ioflag)
|
||||
{
|
||||
|
||||
dorot13(buf, *resid);
|
||||
return puffs_null_node_write(pcc, opc, buf, offset, resid, pcr, ioflag);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user