minix/lib/libpuffs/null.c
Thomas Veerman 490e0de548 Import librefuse and libpuffs
Import libpuffs and our port of libpuffs. The port was done as part of
GSoC 2011 FUSE project, done by Evgeniy Ivanov. The librefuse import
did not require any porting efforts. Libpuffs has been modified to
understand our VFS-FS protocol and translate between that and PUFFS. As
an example that it works, fuse-ntfs-3g from pkgsrc can be compiled and
used to mount ntfs partitions:
mount -t ntfs-3g <device> <mountpoint>

FUSE only works with the asynchronous version of VFS. See <docs/UPDATING> on
how to run AVFS.

This patch further includes some changes to mount(1) and mount(2) so it's
possible to use file systems provided by pkgsrc (note: manual modifications
to /etc/system.conf are still needed. There has been made an exception for
fuse-ntfs-3g, so it already as an entry).
2011-11-14 11:53:05 +00:00

589 lines
13 KiB
C

/* $NetBSD: null.c,v 1.25 2008/08/12 19:44:39 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.
*
* 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.
*/
#include <sys/cdefs.h>
#if !defined(lint)
__RCSID("$NetBSD: null.c,v 1.25 2008/08/12 19:44:39 pooka Exp $");
#endif /* !lint */
/*
* A "nullfs" using puffs, i.e. maps one location in the hierarchy
* to another using standard system calls.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <assert.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <utime.h>
#include "puffs.h"
PUFFSOP_PROTOS(puffs_null)
/*
* set attributes to what is specified. XXX: no rollback in case of failure
*/
static int
processvattr(const char *path, const struct vattr *va, int regular)
{
struct utimbuf tbuf;
/* XXX: -1 == PUFFS_VNOVAL, but shouldn't trust that */
if (va->va_uid != (unsigned)-1 || va->va_gid != (unsigned)-1)
/* FIXME: lchown */
if (chown(path, va->va_uid, va->va_gid) == -1)
return errno;
if (va->va_mode != (unsigned)PUFFS_VNOVAL)
/* FIXME: lchmod */
if (chmod(path, va->va_mode) == -1)
return errno;
/* sloppy */
if (va->va_atime.tv_sec != (unsigned)PUFFS_VNOVAL
|| va->va_mtime.tv_sec != (unsigned)PUFFS_VNOVAL) {
/* FIXME: nsec too */
tbuf.actime = va->va_atime.tv_sec;
tbuf.modtime = va->va_mtime.tv_sec;
/* FIXME: lutimes */
if (utime(path, &tbuf) == -1)
return errno;
}
if (regular && va->va_size != (u_quad_t)PUFFS_VNOVAL)
if (truncate(path, (off_t)va->va_size) == -1)
return errno;
return 0;
}
/*
* Kludge to open files which aren't writable *any longer*. This kinda
* works because the vfs layer does validation checks based on the file's
* permissions to allow writable opening before opening them. However,
* the problem arises if we want to create a file, write to it (cache),
* adjust permissions and then flush the file.
*/
static int
writeableopen(const char *path)
{
struct stat sb;
mode_t origmode;
int sverr = 0;
int fd;
fd = open(path, O_WRONLY);
if (fd == -1) {
if (errno == EACCES) {
if (stat(path, &sb) == -1)
return -1;
origmode = sb.st_mode & ALLPERMS;
if (chmod(path, 0200) == -1)
return -1;
fd = open(path, O_WRONLY);
if (fd == -1)
sverr = errno;
chmod(path, origmode);
if (sverr)
errno = sverr;
} else
return -1;
}
return fd;
}
/*ARGSUSED*/
static void *
inodecmp(struct puffs_usermount *pu, struct puffs_node *pn, void *arg)
{
ino_t *cmpino = arg;
if (pn->pn_va.va_fileid == *cmpino)
return pn;
return NULL;
}
static int
makenode(struct puffs_usermount *pu, struct puffs_newinfo *pni,
const struct puffs_cn *pcn, const struct vattr *va, int regular)
{
struct puffs_node *pn;
struct stat sb;
int rv;
if ((rv = processvattr(PCNPATH(pcn), va, regular)) != 0)
return rv;
pn = puffs_pn_new(pu, NULL);
if (!pn)
return ENOMEM;
puffs_setvattr(&pn->pn_va, va);
if (lstat(PCNPATH(pcn), &sb) == -1)
return errno;
puffs_stat2vattr(&pn->pn_va, &sb);
puffs_newinfo_setcookie(pni, pn);
return 0;
}
/* This should be called first and overriden from the file system */
void
puffs_null_setops(struct puffs_ops *pops)
{
PUFFSOP_SET(pops, puffs_null, fs, statvfs);
PUFFSOP_SETFSNOP(pops, unmount);
PUFFSOP_SETFSNOP(pops, sync);
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);
PUFFSOP_SET(pops, puffs_null, node, readdir);
PUFFSOP_SET(pops, puffs_null, node, read);
PUFFSOP_SET(pops, puffs_null, node, write);
PUFFSOP_SET(pops, puffs_genfs, node, reclaim);
}
/*ARGSUSED*/
int
puffs_null_fs_statvfs(struct puffs_usermount *pu, struct statvfs *svfsb)
{
if (statvfs(PNPATH(puffs_getroot(pu)), svfsb) == -1)
return errno;
return 0;
}
int
puffs_null_node_lookup(struct puffs_usermount *pu, puffs_cookie_t opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn)
{
struct puffs_node *pn = opc, *pn_res;
struct stat sb;
int rv;
assert(pn->pn_va.va_type == VDIR);
/*
* Note to whoever is copypasting this: you must first check
* if the node is there and only then do nodewalk. Alternatively
* you could make sure that you don't return unlinked/rmdir'd
* nodes in some other fashion
*/
rv = lstat(PCNPATH(pcn), &sb);
if (rv)
return errno;
/* XXX2: nodewalk is a bit too slow here */
pn_res = puffs_pn_nodewalk(pu, inodecmp, &sb.st_ino);
if (pn_res == NULL) {
pn_res = puffs_pn_new(pu, NULL);
if (pn_res == NULL)
return ENOMEM;
puffs_stat2vattr(&pn_res->pn_va, &sb);
}
puffs_newinfo_setcookie(pni, pn_res);
puffs_newinfo_setvtype(pni, pn_res->pn_va.va_type);
puffs_newinfo_setsize(pni, (voff_t)pn_res->pn_va.va_size);
puffs_newinfo_setrdev(pni, pn_res->pn_va.va_rdev);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_create(struct puffs_usermount *pu, puffs_cookie_t opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
int fd, rv;
fd = open(PCNPATH(pcn), O_RDWR | O_CREAT | O_TRUNC);
if (fd == -1)
return errno;
close(fd);
rv = makenode(pu, pni, pcn, va, 1);
if (rv)
unlink(PCNPATH(pcn));
return rv;
}
/*ARGSUSED*/
int
puffs_null_node_mknod(struct puffs_usermount *pu, puffs_cookie_t opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
mode_t mode;
int rv;
mode = puffs_addvtype2mode(va->va_mode, va->va_type);
if (mknod(PCNPATH(pcn), mode, va->va_rdev) == -1)
return errno;
rv = makenode(pu, pni, pcn, va, 0);
if (rv)
unlink(PCNPATH(pcn));
return rv;
}
/*ARGSUSED*/
int
puffs_null_node_getattr(struct puffs_usermount *pu, puffs_cookie_t opc,
struct vattr *va, const struct puffs_cred *pcred)
{
struct puffs_node *pn = opc;
struct stat sb;
if (lstat(PNPATH(pn), &sb) == -1)
return errno;
puffs_stat2vattr(va, &sb);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_setattr(struct puffs_usermount *pu, puffs_cookie_t opc,
const struct vattr *va, const struct puffs_cred *pcred)
{
struct puffs_node *pn = opc;
int rv;
rv = processvattr(PNPATH(pn), va, pn->pn_va.va_type == VREG);
if (rv)
return rv;
puffs_setvattr(&pn->pn_va, va);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_fsync(struct puffs_usermount *pu, puffs_cookie_t opc,
const struct puffs_cred *pcred, int how,
off_t offlo, off_t offhi)
{
/* FIXME: implement me. */
#if 0
struct puffs_node *pn = opc;
int fd, rv;
int fflags;
rv = 0;
fd = writeableopen(PNPATH(pn));
if (fd == -1)
return errno;
if (how & PUFFS_FSYNC_DATAONLY)
fflags = FDATASYNC;
else
fflags = FFILESYNC;
if (how & PUFFS_FSYNC_CACHE)
fflags |= FDISKSYNC;
if (fsync_range(fd, fflags, offlo, offhi - offlo) == -1)
rv = errno;
close(fd);
return rv;
#endif
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_remove(struct puffs_usermount *pu, puffs_cookie_t opc,
puffs_cookie_t targ, const struct puffs_cn *pcn)
{
struct puffs_node *pn_targ = targ;
if (unlink(PCNPATH(pcn)) == -1)
return errno;
puffs_pn_remove(pn_targ);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_link(struct puffs_usermount *pu, puffs_cookie_t opc,
puffs_cookie_t targ, const struct puffs_cn *pcn)
{
struct puffs_node *pn_targ = targ;
if (link(PNPATH(pn_targ), PCNPATH(pcn)) == -1)
return errno;
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_rename(struct puffs_usermount *pu, puffs_cookie_t opc,
puffs_cookie_t src, const struct puffs_cn *pcn_src,
puffs_cookie_t targ_dir, puffs_cookie_t targ,
const struct puffs_cn *pcn_targ)
{
struct puffs_node *pn_targ = targ;
if (rename(PCNPATH(pcn_src), PCNPATH(pcn_targ)) == -1)
return errno;
if (pn_targ)
puffs_pn_remove(pn_targ);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_mkdir(struct puffs_usermount *pu, puffs_cookie_t opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va)
{
int rv;
if (mkdir(PCNPATH(pcn), va->va_mode) == -1)
return errno;
rv = makenode(pu, pni, pcn, va, 0);
if (rv)
rmdir(PCNPATH(pcn));
return rv;
}
/*ARGSUSED*/
int
puffs_null_node_rmdir(struct puffs_usermount *pu, puffs_cookie_t opc,
puffs_cookie_t targ, const struct puffs_cn *pcn)
{
struct puffs_node *pn_targ = targ;
if (rmdir(PNPATH(pn_targ)) == -1)
return errno;
puffs_pn_remove(pn_targ);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_symlink(struct puffs_usermount *pu, puffs_cookie_t opc,
struct puffs_newinfo *pni, const struct puffs_cn *pcn,
const struct vattr *va, const char *linkname)
{
int rv;
if (symlink(linkname, PCNPATH(pcn)) == -1)
return errno;
rv = makenode(pu, pni, pcn, va, 0);
if (rv)
unlink(PCNPATH(pcn));
return rv;
}
/*ARGSUSED*/
int
puffs_null_node_readlink(struct puffs_usermount *pu, puffs_cookie_t opc,
const struct puffs_cred *pcred, char *linkname, size_t *linklen)
{
struct puffs_node *pn = opc;
ssize_t rv;
rv = readlink(PNPATH(pn), linkname, *linklen);
if (rv == -1)
return errno;
*linklen = rv;
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_readdir(struct puffs_usermount *pu, puffs_cookie_t opc,
struct dirent *de, off_t *off, size_t *reslen,
const struct puffs_cred *pcred, int *eofflag, off_t *cookies,
size_t *ncookies)
{
/* TODO: use original code since we have libc from NetBSD */
struct puffs_node *pn = opc;
struct dirent *entry;
DIR *dp;
off_t i;
int rv;
dp = opendir(PNPATH(pn));
if (dp == NULL)
return errno;
rv = 0;
i = *off;
/*
* XXX: need to do trickery here, telldir/seekdir would be nice, but
* then we'd need to keep state, which I'm too lazy to keep
*/
while (i--) {
entry = readdir(dp);
if (!entry) {
*eofflag = 1;
goto out;
}
}
for (;;) {
/* FIXME: DIRENT_SIZE macro? For now do calculations here */
int namelen;
char* cp;
int dirent_size;
entry = readdir(dp);
if (!entry) {
*eofflag = 1;
goto out;
}
cp = memchr(entry->d_name, '\0', NAME_MAX);
if (cp == NULL)
namelen = NAME_MAX;
else
namelen = cp - (entry->d_name);
dirent_size = _DIRENT_RECLEN(entry, namelen);
if (dirent_size > *reslen)
goto out;
*de = *entry;
strncpy(de->d_name, entry->d_name, namelen);
*reslen -= dirent_size;
de = _DIRENT_NEXT(de);
(*off)++;
}
out:
closedir(dp);
return 0;
}
/*ARGSUSED*/
int
puffs_null_node_read(struct puffs_usermount *pu, puffs_cookie_t opc,
uint8_t *buf, off_t offset, size_t *buflen,
const struct puffs_cred *pcred, int ioflag)
{
struct puffs_node *pn = opc;
ssize_t n;
off_t off;
int fd, rv;
rv = 0;
fd = open(PNPATH(pn), O_RDONLY);
if (fd == -1)
return errno;
off = lseek(fd, offset, SEEK_SET);
if (off == -1) {
rv = errno;
goto out;
}
n = read(fd, buf, *buflen);
if (n == -1)
rv = errno;
else
*buflen -= n;
out:
close(fd);
return rv;
}
/*ARGSUSED*/
int
puffs_null_node_write(struct puffs_usermount *pu, puffs_cookie_t opc,
uint8_t *buf, off_t offset, size_t *buflen,
const struct puffs_cred *pcred, int ioflag)
{
struct puffs_node *pn = opc;
ssize_t n;
off_t off;
int fd, rv;
rv = 0;
fd = writeableopen(PNPATH(pn));
if (fd == -1)
return errno;
off = lseek(fd, offset, SEEK_SET);
if (off == -1) {
rv = errno;
goto out;
}
n = write(fd, buf, *buflen);
if (n == -1)
rv = errno;
else
*buflen -= n;
out:
close(fd);
return rv;
}