NetBSD-5.0.2/sys/fs/sysvbfs/sysvbfs_vfsops.c
/* $NetBSD: sysvbfs_vfsops.c,v 1.26 2008/09/04 12:28:14 pooka Exp $ */
/*-
* Copyright (c) 2004 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by UCHIYAMA Yasushi.
*
* 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION 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>
__KERNEL_RCSID(0, "$NetBSD: sysvbfs_vfsops.c,v 1.26 2008/09/04 12:28:14 pooka Exp $");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/pool.h>
#include <sys/time.h>
#include <sys/ucred.h>
#include <sys/mount.h>
#include <sys/disklabel.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/kauth.h>
#include <sys/proc.h>
/* v-node */
#include <sys/namei.h>
#include <sys/vnode.h>
/* devsw */
#include <sys/conf.h>
#include <fs/sysvbfs/sysvbfs.h> /* external interface */
#include <fs/sysvbfs/bfs.h> /* internal interface */
#ifdef SYSVBFS_VNOPS_DEBUG
#define DPRINTF(fmt, args...) printf(fmt, ##args)
#else
#define DPRINTF(arg...) ((void)0)
#endif
MALLOC_JUSTDEFINE(M_SYSVBFS_VFS, "sysvbfs vfs", "sysvbfs vfs structures");
struct pool sysvbfs_node_pool;
int sysvbfs_mountfs(struct vnode *, struct mount *, struct lwp *);
int
sysvbfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct nameidata nd;
struct sysvbfs_args *args = data;
struct sysvbfs_mount *bmp = NULL;
struct vnode *devvp = NULL;
int error;
bool update;
DPRINTF("%s: mnt_flag=%x\n", __func__, mp->mnt_flag);
if (*data_len < sizeof *args)
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
if ((bmp = (void *)mp->mnt_data) == NULL)
return EIO;
args->fspec = NULL;
*data_len = sizeof *args;
return 0;
}
DPRINTF("%s: args->fspec=%s\n", __func__, args->fspec);
update = mp->mnt_flag & MNT_UPDATE;
if (args->fspec == NULL) {
/* nothing to do. */
return EINVAL;
}
if (args->fspec != NULL) {
/* Look up the name and verify that it's sane. */
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, args->fspec);
if ((error = namei(&nd)) != 0)
return (error);
devvp = nd.ni_vp;
if (!update) {
/*
* Be sure this is a valid block device
*/
if (devvp->v_type != VBLK)
error = ENOTBLK;
else if (bdevsw_lookup(devvp->v_rdev) == NULL)
error = ENXIO;
} else {
/*
* Be sure we're still naming the same device
* used for our initial mount
*/
if (devvp != bmp->devvp)
error = EINVAL;
}
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*/
if (error == 0 && kauth_authorize_generic(l->l_cred,
KAUTH_GENERIC_ISSUSER, NULL)) {
int accessmode = VREAD;
if (update ?
(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
(mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_ACCESS(devvp, accessmode, l->l_cred);
VOP_UNLOCK(devvp, 0);
}
if (error) {
vrele(devvp);
return error;
}
if (!update) {
if ((error = sysvbfs_mountfs(devvp, mp, l)) != 0) {
vrele(devvp);
return error;
}
} else if (mp->mnt_flag & MNT_RDONLY) {
/* XXX: r/w -> read only */
}
return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
mp->mnt_op->vfs_name, mp, l);
}
int
sysvbfs_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
{
kauth_cred_t cred = l->l_cred;
struct sysvbfs_mount *bmp;
struct partinfo dpart;
int error, oflags;
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0);
VOP_UNLOCK(devvp, 0);
if (error)
return error;
/* Open block device */
oflags = FREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
oflags |= FWRITE;
if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0)
return error;
/* Get partition information */
if ((error = VOP_IOCTL(devvp, DIOCGPART, &dpart, FREAD, cred)) != 0)
return error;
bmp = malloc(sizeof(struct sysvbfs_mount), M_SYSVBFS_VFS, M_WAITOK);
if (bmp == NULL)
return ENOMEM;
bmp->devvp = devvp;
bmp->mountp = mp;
if ((error = sysvbfs_bfs_init(&bmp->bfs, devvp)) != 0) {
free(bmp, M_SYSVBFS_VFS);
return error;
}
LIST_INIT(&bmp->bnode_head);
mp->mnt_data = bmp;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_SYSVBFS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_dev_bshift = BFS_BSHIFT;
mp->mnt_fs_bshift = BFS_BSHIFT;
DPRINTF("fstype=%d dtype=%d bsize=%d\n", dpart.part->p_fstype,
dpart.disklab->d_type, dpart.disklab->d_secsize);
return 0;
}
int
sysvbfs_start(struct mount *mp, int flags)
{
DPRINTF("%s:\n", __func__);
/* Nothing to do. */
return 0;
}
int
sysvbfs_unmount(struct mount *mp, int mntflags)
{
struct sysvbfs_mount *bmp = (void *)mp->mnt_data;
int error;
DPRINTF("%s: %p\n", __func__, bmp);
if ((error = vflush(mp, NULLVP,
mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
return error;
vn_lock(bmp->devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(bmp->devvp, FREAD, NOCRED);
vput(bmp->devvp);
sysvbfs_bfs_fini(bmp->bfs);
free(bmp, M_SYSVBFS_VFS);
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return 0;
}
int
sysvbfs_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
int error;
DPRINTF("%s:\n", __func__);
if ((error = VFS_VGET(mp, BFS_ROOT_INODE, &vp)) != 0)
return error;
*vpp = vp;
return 0;
}
int
sysvbfs_statvfs(struct mount *mp, struct statvfs *f)
{
struct sysvbfs_mount *bmp = mp->mnt_data;
struct bfs *bfs = bmp->bfs;
int free_block;
size_t data_block;
data_block = (bfs->data_end - bfs->data_start) >> BFS_BSHIFT;
if (bfs_inode_alloc(bfs, 0, 0, &free_block) != 0)
free_block = 0;
else
free_block = (bfs->data_end >> BFS_BSHIFT) - free_block;
DPRINTF("%s: %d %d %d\n", __func__, bfs->data_start,
bfs->data_end, free_block);
f->f_bsize = BFS_BSIZE;
f->f_frsize = BFS_BSIZE;
f->f_iosize = BFS_BSIZE;
f->f_blocks = data_block;
f->f_bfree = free_block;
f->f_bavail = f->f_bfree;
f->f_bresvd = 0;
f->f_files = bfs->n_inode;
f->f_ffree = bfs->max_inode - f->f_files;
f->f_favail = f->f_ffree;
f->f_fresvd = 0;
copy_statvfs_info(f, mp);
return 0;
}
int
sysvbfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct sysvbfs_mount *bmp = mp->mnt_data;
struct sysvbfs_node *bnode;
struct vnode *v;
int err, error;
DPRINTF("%s:\n", __func__);
error = 0;
mutex_enter(&mntvnode_lock);
for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL;
bnode = LIST_NEXT(bnode, link)) {
v = bnode->vnode;
mutex_enter(&v->v_interlock);
mutex_exit(&mntvnode_lock);
err = vget(v, LK_EXCLUSIVE | LK_NOWAIT | LK_INTERLOCK);
if (err == 0) {
err = VOP_FSYNC(v, cred, FSYNC_WAIT, 0, 0);
vput(v);
}
if (err != 0)
error = err;
mutex_enter(&mntvnode_lock);
}
mutex_exit(&mntvnode_lock);
return error;
}
int
sysvbfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
struct sysvbfs_mount *bmp = mp->mnt_data;
struct bfs *bfs = bmp->bfs;
struct vnode *vp;
struct sysvbfs_node *bnode;
struct bfs_inode *inode;
int error;
DPRINTF("%s: i-node=%lld\n", __func__, (long long)ino);
/* Lookup requested i-node */
if (!bfs_inode_lookup(bfs, ino, &inode)) {
DPRINTF("bfs_inode_lookup failed.\n");
return ENOENT;
}
for (bnode = LIST_FIRST(&bmp->bnode_head); bnode != NULL;
bnode = LIST_NEXT(bnode, link)) {
if (bnode->inode->number == ino) {
*vpp = bnode->vnode;
}
}
/* Allocate v-node. */
if ((error = getnewvnode(VT_SYSVBFS, mp, sysvbfs_vnodeop_p, &vp)) !=
0) {
DPRINTF("%s: getnewvnode error.\n", __func__);
return error;
}
/* Lock vnode here */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/* Allocate i-node */
vp->v_data = pool_get(&sysvbfs_node_pool, PR_WAITOK);
memset(vp->v_data, 0, sizeof(struct sysvbfs_node));
bnode = vp->v_data;
mutex_enter(&mntvnode_lock);
LIST_INSERT_HEAD(&bmp->bnode_head, bnode, link);
mutex_exit(&mntvnode_lock);
bnode->vnode = vp;
bnode->bmp = bmp;
bnode->inode = inode;
bnode->lockf = NULL; /* advlock */
if (ino == BFS_ROOT_INODE) { /* BFS is flat filesystem */
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
} else {
vp->v_type = VREG;
}
genfs_node_init(vp, &sysvbfs_genfsops);
uvm_vnp_setsize(vp, bfs_file_size(inode));
*vpp = vp;
return 0;
}
int
sysvbfs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
{
DPRINTF("%s:\n", __func__);
/* notyet */
return EOPNOTSUPP;
}
int
sysvbfs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
{
DPRINTF("%s:\n", __func__);
/* notyet */
return EOPNOTSUPP;
}
MALLOC_DECLARE(M_BFS);
MALLOC_DECLARE(M_SYSVBFS_VNODE);
void
sysvbfs_init(void)
{
DPRINTF("%s:\n", __func__);
malloc_type_attach(M_SYSVBFS_VFS);
malloc_type_attach(M_BFS);
malloc_type_attach(M_SYSVBFS_VNODE);
pool_init(&sysvbfs_node_pool, sizeof(struct sysvbfs_node), 0, 0, 0,
"sysvbfs_node_pool", &pool_allocator_nointr, IPL_NONE);
}
void
sysvbfs_reinit(void)
{
/* Nothing to do. */
DPRINTF("%s:\n", __func__);
}
void
sysvbfs_done(void)
{
DPRINTF("%s:\n", __func__);
pool_destroy(&sysvbfs_node_pool);
malloc_type_detach(M_BFS);
malloc_type_detach(M_SYSVBFS_VFS);
malloc_type_detach(M_SYSVBFS_VNODE);
}
int
sysvbfs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
kauth_cred_t cred)
{
return 0;
}