/* $NetBSD: v7fs_io_kern.c,v 1.5 2017/08/27 06:18:16 skrll Exp $ */

/* $NetBSD: v7fs_io_kern.c,v 1.5 2017/08/27 06:18:16 skrll 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_io_kern.c,v 1.5 2017/08/27 06:18:16 skrll Exp $");

#if defined _KERNEL_OPT
#include "opt_v7fs.h"
#endif

#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/kmem.h>
#include <sys/kauth.h>
#include <sys/mutex.h>

#include <fs/v7fs/v7fs.h>
#include "v7fs_endian.h"
#include "v7fs_impl.h"

#ifdef V7FS_IO_DEBUG
#define DPRINTF(fmt, args...) printf("%s: " fmt, __func__, ##args)
#else
#define DPRINTF(fmt, args...) ((void)0)
#endif

struct local_io {
struct vnode *vp;
kauth_cred_t cred;
};

static bool v7fs_os_read_n(void *, uint8_t *, daddr_t, int);
static bool v7fs_os_read(void *, uint8_t *, daddr_t);
static bool v7fs_os_write_n(void *, uint8_t *, daddr_t, int);
static bool v7fs_os_write(void *, uint8_t *, daddr_t);
static void v7fs_os_lock(void *);
static void v7fs_os_unlock(void *);
static bool lock_init(struct lock_ops *);

int
v7fs_io_init(struct v7fs_self **fs,
const struct v7fs_mount_device *mount_device, size_t block_size)
{
struct vnode *vp = mount_device->device.vnode;
struct v7fs_self *p;
struct local_io *local;
int error = 0;

p = kmem_zalloc(sizeof(*p), KM_SLEEP);
p->scratch_free = -1;
p->scratch_remain = V7FS_SELF_NSCRATCH;

/* Endian */
p->endian = mount_device->endian;
#ifdef V7FS_EI
v7fs_endian_init(p);
#endif
/* IO */
local = kmem_zalloc(sizeof(*local), KM_SLEEP);
p->io.read = v7fs_os_read;
p->io.read_n = v7fs_os_read_n;
p->io.write = v7fs_os_write;
p->io.write_n = v7fs_os_write_n;
p->scratch_free = -1; /* free all scratch buffer */

p->io.cookie = local;
local->vp = vp;
local->cred = NOCRED; /* upper layer check cred. */

/*LOCK */
error = ENOMEM;
if (!lock_init(&p->sb_lock))
goto errexit;
if (!lock_init(&p->ilist_lock))
goto errexit;
if (!lock_init(&p->mem_lock))
goto errexit;
error = 0;

*fs = p;
return 0;

errexit:
v7fs_io_fini(p);
return error;
}

static bool
lock_init(struct lock_ops *ops)
{
ops->cookie = kmem_zalloc(sizeof(kmutex_t), KM_SLEEP);
mutex_init(ops->cookie, MUTEX_DEFAULT, IPL_NONE);
ops->lock = v7fs_os_lock;
ops->unlock = v7fs_os_unlock;
return true;
}

void
v7fs_io_fini(struct v7fs_self *fs)
{
if (fs->io.cookie) {
kmem_free(fs->io.cookie, sizeof(struct local_io));
}
if (fs->sb_lock.cookie) {
mutex_destroy(fs->sb_lock.cookie);
kmem_free(fs->sb_lock.cookie, sizeof(kmutex_t));
}
if (fs->ilist_lock.cookie) {
mutex_destroy(fs->ilist_lock.cookie);
kmem_free(fs->ilist_lock.cookie, sizeof(kmutex_t));
}
if (fs->mem_lock.cookie) {
mutex_destroy(fs->mem_lock.cookie);
kmem_free(fs->mem_lock.cookie, sizeof(kmutex_t));
}
kmem_free(fs, sizeof(*fs));
}

static bool
v7fs_os_read_n(void *self, uint8_t *buf, daddr_t block, int count)
{
int i;

for (i = 0; i < count; i++) {
if (!v7fs_os_read(self, buf, block))
return false;
buf += DEV_BSIZE;
block++;
}

return true;
}

static bool
v7fs_os_read(void *self, uint8_t *buf, daddr_t block)
{
struct local_io *bio = (struct local_io *)self;
struct buf *bp = NULL;

if (bread(bio->vp, block, DEV_BSIZE, 0, &bp) != 0)
goto error_exit;
memcpy(buf, bp->b_data, DEV_BSIZE);
brelse(bp, 0);

return true;
error_exit:
DPRINTF("block %ld read failed.\n", (long)block);

if (bp != NULL)
brelse(bp, 0);
return false;
}

static bool
v7fs_os_write_n(void *self, uint8_t *buf, daddr_t block, int count)
{
int i;

for (i = 0; i < count; i++) {
if (!v7fs_os_write(self, buf, block))
return false;
buf += DEV_BSIZE;
block++;
}

return true;
}

static bool
v7fs_os_write(void *self, uint8_t *buf, daddr_t block)
{
struct local_io *bio = (struct local_io *)self;
struct buf *bp;

if ((bp = getblk(bio->vp, block, DEV_BSIZE, 0, 0)) == 0) {
DPRINTF("getblk failed. block=%ld\n", (long)block);
return false;
}

memcpy(bp->b_data, buf, DEV_BSIZE);

if (bwrite(bp) != 0) {
DPRINTF("bwrite failed. block=%ld\n", (long)block);
return false;
}

return true;
}

static void
v7fs_os_lock(void *self)
{

mutex_enter((kmutex_t *)self);
}

static void
v7fs_os_unlock(void *self)
{

mutex_exit((kmutex_t *)self);
}