minix/sys/fs/v7fs/v7fs_vfsops.c
Jean-Baptiste Boric 9f988b7934 Import makefs from NetBSD
Change-Id: I0ebcc9d0168df9d26cfb0af0fce2bc894ce688af
2015-10-07 12:39:44 +02:00

617 lines
14 KiB
C

/* $NetBSD: v7fs_vfsops.c,v 1.9 2013/11/23 13:35:36 christos Exp $ */
/*-
* Copyright (c) 2004, 2011 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: v7fs_vfsops.c,v 1.9 2013/11/23 13:35:36 christos Exp $");
#if defined _KERNEL_OPT
#include "opt_v7fs.h"
#endif
#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/disk.h>
#include <sys/device.h>
#include <sys/fcntl.h>
#include <sys/kmem.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 "v7fs_extern.h"
#include "v7fs.h"
#include "v7fs_impl.h"
#include "v7fs_inode.h"
#include "v7fs_superblock.h"
#ifdef V7FS_VFSOPS_DEBUG
#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
#else
#define DPRINTF(arg...) ((void)0)
#endif
struct pool v7fs_node_pool;
static int v7fs_mountfs(struct vnode *, struct mount *, int);
static int v7fs_openfs(struct vnode *, struct mount *, struct lwp *);
static void v7fs_closefs(struct vnode *, struct mount *);
static int is_v7fs_partition(struct vnode *);
static enum vtype v7fs_mode_to_vtype(v7fs_mode_t mode);
int v7fs_vnode_reload(struct mount *, struct vnode *);
int
v7fs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
struct lwp *l = curlwp;
struct v7fs_args *args = data;
struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
struct vnode *devvp = NULL;
int error = 0;
bool update = mp->mnt_flag & MNT_UPDATE;
DPRINTF("mnt_flag=%x %s\n", mp->mnt_flag, update ? "update" : "");
if (*data_len < sizeof(*args))
return EINVAL;
if (mp->mnt_flag & MNT_GETARGS) {
if (!v7fsmount)
return EIO;
args->fspec = NULL;
args->endian = v7fsmount->core->endian;
*data_len = sizeof(*args);
return 0;
}
DPRINTF("args->fspec=%s endian=%d\n", args->fspec, args->endian);
if (args->fspec == NULL) {
/* nothing to do. */
return EINVAL;
}
if (args->fspec != NULL) {
/* Look up the name and verify that it's sane. */
error = namei_simple_user(args->fspec,
NSM_FOLLOW_NOEMULROOT, &devvp);
if (error != 0)
return (error);
DPRINTF("mount device=%lx\n", (long)devvp->v_rdev);
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 {
KDASSERT(v7fsmount);
/*
* Be sure we're still naming the same device
* used for our initial mount
*/
if (devvp != v7fsmount->devvp) {
DPRINTF("devvp %p != %p rootvp=%p\n", devvp,
v7fsmount->devvp, rootvp);
if (rootvp == v7fsmount->devvp) {
vrele(devvp);
devvp = rootvp;
vref(devvp);
} else {
error = EINVAL;
}
}
}
}
/*
* If mount by non-root, then verify that user has necessary
* permissions on the device.
*
* Permission to update a mount is checked higher, so here we presume
* updating the mount is okay (for example, as far as securelevel goes)
* which leaves us with the normal check.
*/
if (error == 0) {
int accessmode = VREAD;
if (update ?
(mp->mnt_iflag & IMNT_WANTRDWR) != 0 :
(mp->mnt_flag & MNT_RDONLY) == 0)
accessmode |= VWRITE;
error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp,
KAUTH_ARG(accessmode));
}
if (error) {
vrele(devvp);
return error;
}
if (!update) {
if ((error = v7fs_openfs(devvp, mp, l))) {
vrele(devvp);
return error;
}
if ((error = v7fs_mountfs(devvp, mp, args->endian))) {
v7fs_closefs(devvp, mp);
VOP_UNLOCK(devvp);
vrele(devvp);
return error;
}
VOP_UNLOCK(devvp);
} 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);
}
static int
is_v7fs_partition(struct vnode *devvp)
{
struct dkwedge_info dkw;
int error;
if ((error = getdiskinfo(devvp, &dkw)) != 0) {
DPRINTF("getdiskinfo=%d\n", error);
return error;
}
DPRINTF("ptype=%s size=%" PRIu64 "\n", dkw.dkw_ptype, dkw->dkw_size);
return strcmp(dkw.dkw_ptype, DKW_PTYPE_V7) == 0 ? 0 : EINVAL;
}
static int
v7fs_openfs(struct vnode *devvp, struct mount *mp, struct lwp *l)
{
kauth_cred_t cred = l->l_cred;
int oflags;
int error;
/* Flush buffer */
vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
if ((error = vinvalbuf(devvp, V_SAVE, cred, l, 0, 0)))
goto unlock_exit;
/* Open block device */
oflags = FREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
oflags |= FWRITE;
if ((error = VOP_OPEN(devvp, oflags, NOCRED)) != 0) {
DPRINTF("VOP_OPEN=%d\n", error);
goto unlock_exit;
}
return 0; /* lock held */
unlock_exit:
VOP_UNLOCK(devvp);
return error;
}
static void
v7fs_closefs(struct vnode *devvp, struct mount *mp)
{
int oflags = FREAD;
if ((mp->mnt_flag & MNT_RDONLY) == 0)
oflags |= FWRITE;
VOP_CLOSE(devvp, oflags, NOCRED);
}
static int
v7fs_mountfs(struct vnode *devvp, struct mount *mp, int endian)
{
struct v7fs_mount *v7fsmount;
int error;
struct v7fs_mount_device mount;
DPRINTF("%d\n",endian);
v7fsmount = kmem_zalloc(sizeof(*v7fsmount), KM_SLEEP);
if (v7fsmount == NULL) {
return ENOMEM;
}
v7fsmount->devvp = devvp;
v7fsmount->mountp = mp;
mount.device.vnode = devvp;
mount.endian = endian;
if ((error = v7fs_io_init(&v7fsmount->core, &mount, V7FS_BSIZE))) {
goto err_exit;
}
struct v7fs_self *fs = v7fsmount->core;
if ((error = v7fs_superblock_load(fs))) {
v7fs_io_fini(fs);
goto err_exit;
}
LIST_INIT(&v7fsmount->v7fs_node_head);
mp->mnt_data = v7fsmount;
mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)devvp->v_rdev;
mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_V7FS);
mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
mp->mnt_stat.f_namemax = V7FS_NAME_MAX;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_dev_bshift = V7FS_BSHIFT;
mp->mnt_fs_bshift = V7FS_BSHIFT;
return 0;
err_exit:
kmem_free(v7fsmount, sizeof(*v7fsmount));
return error;
}
int
v7fs_start(struct mount *mp, int flags)
{
DPRINTF("\n");
/* Nothing to do. */
return 0;
}
int
v7fs_unmount(struct mount *mp, int mntflags)
{
struct v7fs_mount *v7fsmount = (void *)mp->mnt_data;
int error;
DPRINTF("%p\n", v7fsmount);
if ((error = vflush(mp, NULLVP,
mntflags & MNT_FORCE ? FORCECLOSE : 0)) != 0)
return error;
vn_lock(v7fsmount->devvp, LK_EXCLUSIVE | LK_RETRY);
error = VOP_CLOSE(v7fsmount->devvp, FREAD, NOCRED);
vput(v7fsmount->devvp);
v7fs_io_fini(v7fsmount->core);
kmem_free(v7fsmount, sizeof(*v7fsmount));
mp->mnt_data = NULL;
mp->mnt_flag &= ~MNT_LOCAL;
return 0;
}
int
v7fs_root(struct mount *mp, struct vnode **vpp)
{
struct vnode *vp;
int error;
DPRINTF("\n");
if ((error = VFS_VGET(mp, V7FS_ROOT_INODE, &vp)) != 0) {
DPRINTF("error=%d\n", error);
return error;
}
*vpp = vp;
DPRINTF("done.\n");
return 0;
}
int
v7fs_statvfs(struct mount *mp, struct statvfs *f)
{
struct v7fs_mount *v7fsmount = mp->mnt_data;
struct v7fs_self *fs = v7fsmount->core;
DPRINTF("scratch remain=%d\n", fs->scratch_remain);
v7fs_superblock_status(fs);
f->f_bsize = V7FS_BSIZE;
f->f_frsize = V7FS_BSIZE;
f->f_iosize = V7FS_BSIZE;
f->f_blocks = fs->stat.total_blocks;
f->f_bfree = fs->stat.free_blocks;
f->f_bavail = fs->stat.free_blocks;
f->f_bresvd = 0;
f->f_files = fs->stat.total_files;
f->f_ffree = fs->stat.free_inode;
f->f_favail = f->f_ffree;
f->f_fresvd = 0;
copy_statvfs_info(f, mp);
return 0;
}
int
v7fs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
struct v7fs_mount *v7fsmount = mp->mnt_data;
struct v7fs_self *fs = v7fsmount->core;
struct v7fs_node *v7fs_node;
struct v7fs_inode *inode;
struct vnode *v;
int err, error;
int retry_cnt;
DPRINTF("\n");
v7fs_superblock_writeback(fs);
for (retry_cnt = 0; retry_cnt < 2; retry_cnt++) {
error = 0;
mutex_enter(&mntvnode_lock);
for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
inode = &v7fs_node->inode;
if (!v7fs_inode_allocated(inode)) {
continue;
}
v = v7fs_node->vnode;
mutex_enter(v->v_interlock);
mutex_exit(&mntvnode_lock);
err = vget(v, LK_EXCLUSIVE | LK_NOWAIT);
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);
if (error == 0)
break;
}
return error;
}
static enum vtype
v7fs_mode_to_vtype (v7fs_mode_t mode)
{
enum vtype table[] = { VCHR, VDIR, VBLK, VREG, VLNK, VSOCK };
if ((mode & V7FS_IFMT) == V7FSBSD_IFFIFO)
return VFIFO;
return table[((mode >> 13) & 7) - 1];
}
int
v7fs_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{
struct v7fs_mount *v7fsmount = mp->mnt_data;
struct v7fs_self *fs = v7fsmount->core;
struct vnode *vp;
struct v7fs_node *v7fs_node;
struct v7fs_inode inode;
int error;
/* Lookup requested i-node */
if ((error = v7fs_inode_load(fs, &inode, ino))) {
DPRINTF("v7fs_inode_load failed.\n");
return error;
}
retry:
mutex_enter(&mntvnode_lock);
for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
if (v7fs_node->inode.inode_number == ino) {
vp = v7fs_node->vnode;
mutex_enter(vp->v_interlock);
mutex_exit(&mntvnode_lock);
if (vget(vp, LK_EXCLUSIVE) == 0) {
*vpp = vp;
return 0;
} else {
DPRINTF("retry!\n");
goto retry;
}
}
}
mutex_exit(&mntvnode_lock);
/* Allocate v-node. */
if ((error = getnewvnode(VT_V7FS, mp, v7fs_vnodeop_p, NULL, &vp))) {
DPRINTF("getnewvnode error.\n");
return error;
}
/* Lock vnode here */
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
/* Allocate i-node */
vp->v_data = pool_get(&v7fs_node_pool, PR_WAITOK);
memset(vp->v_data, 0, sizeof(*v7fs_node));
v7fs_node = vp->v_data;
mutex_enter(&mntvnode_lock);
LIST_INSERT_HEAD(&v7fsmount->v7fs_node_head, v7fs_node, link);
mutex_exit(&mntvnode_lock);
v7fs_node->vnode = vp;
v7fs_node->v7fsmount = v7fsmount;
v7fs_node->inode = inode;/*structure copy */
v7fs_node->lockf = NULL; /* advlock */
genfs_node_init(vp, &v7fs_genfsops);
uvm_vnp_setsize(vp, v7fs_inode_filesize(&inode));
if (ino == V7FS_ROOT_INODE) {
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
} else {
vp->v_type = v7fs_mode_to_vtype(inode.mode);
if (vp->v_type == VBLK || vp->v_type == VCHR) {
dev_t rdev = inode.device;
vp->v_op = v7fs_specop_p;
spec_node_init(vp, rdev);
} else if (vp->v_type == VFIFO) {
vp->v_op = v7fs_fifoop_p;
}
}
*vpp = vp;
return 0;
}
int
v7fs_fhtovp(struct mount *mp, struct fid *fid, struct vnode **vpp)
{
DPRINTF("\n");
/* notyet */
return EOPNOTSUPP;
}
int
v7fs_vptofh(struct vnode *vpp, struct fid *fid, size_t *fh_size)
{
DPRINTF("\n");
/* notyet */
return EOPNOTSUPP;
}
void
v7fs_init(void)
{
DPRINTF("\n");
pool_init(&v7fs_node_pool, sizeof(struct v7fs_node), 0, 0, 0,
"v7fs_node_pool", &pool_allocator_nointr, IPL_NONE);
}
void
v7fs_reinit(void)
{
/* Nothing to do. */
DPRINTF("\n");
}
void
v7fs_done(void)
{
DPRINTF("\n");
pool_destroy(&v7fs_node_pool);
}
int
v7fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
kauth_cred_t cred)
{
DPRINTF("\n");
return 0;
}
int
v7fs_mountroot(void)
{
struct mount *mp;
int error;
DPRINTF("");
/* On mountroot, devvp (rootdev) is opened by vfs_mountroot */
if ((error = is_v7fs_partition (rootvp)))
return error;
if ((error = vfs_rootmountalloc(MOUNT_V7FS, "root_device", &mp))) {
DPRINTF("mountalloc error=%d\n", error);
vrele(rootvp);
return error;
}
if ((error = v7fs_mountfs(rootvp, mp, _BYTE_ORDER))) {
DPRINTF("mountfs error=%d\n", error);
vfs_unbusy(mp, false, NULL);
vfs_destroy(mp);
return error;
}
mountlist_append(mp);
vfs_unbusy(mp, false, NULL);
return 0;
}
/* Reload disk inode information */
int
v7fs_vnode_reload(struct mount *mp, struct vnode *vp)
{
struct v7fs_mount *v7fsmount = mp->mnt_data;
struct v7fs_self *fs = v7fsmount->core;
struct v7fs_node *v7fs_node;
struct v7fs_inode *inode = &((struct v7fs_node *)vp->v_data)->inode;
int target_ino = inode->inode_number;
int error = 0;
DPRINTF("#%d\n", target_ino);
mutex_enter(&mntvnode_lock);
for (v7fs_node = LIST_FIRST(&v7fsmount->v7fs_node_head);
v7fs_node != NULL; v7fs_node = LIST_NEXT(v7fs_node, link)) {
inode = &v7fs_node->inode;
if (!v7fs_inode_allocated(inode)) {
continue;
}
if (inode->inode_number == target_ino) {
error = v7fs_inode_load(fs, &v7fs_node->inode,
target_ino);
DPRINTF("sync #%d error=%d\n", target_ino, error);
break;
}
}
mutex_exit(&mntvnode_lock);
return error;
}