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/* $NetBSD: chfs_wbuf.c,v 1.7 2014/10/18 08:33:29 snj Exp $ */
/*-
* Copyright (c) 2010 Department of Software Engineering,
* University of Szeged, Hungary
* Copyright (C) 2010 Tamas Toth <ttoth@inf.u-szeged.hu>
* Copyright (C) 2010 Adam Hoka <ahoka@NetBSD.org>
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by the Department of Software Engineering, University of Szeged, Hungary
*
* 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 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 <dev/flash/flash.h>
#include <sys/uio.h>
#include "chfs.h"
#define DBG_WBUF 1 /* XXX unused, but should be */
#define PAD(x) (((x)+3)&~3)
#define EB_ADDRESS(x) ( rounddown((x), chmp->chm_ebh->eb_size) )
#define PAGE_DIV(x) ( rounddown((x), chmp->chm_wbuf_pagesize) )
#define PAGE_MOD(x) ( (x) % (chmp->chm_wbuf_pagesize) )
/* writebuffer options */
enum {
WBUF_NOPAD,
WBUF_SETPAD
};
/*
* chfs_flush_wbuf - write wbuf to the flash
* Returns zero in case of success.
*/
static int
chfs_flush_wbuf(struct chfs_mount *chmp, int pad)
{
int ret;
size_t retlen;
struct chfs_node_ref *nref;
struct chfs_flash_padding_node* padnode;
KASSERT(mutex_owned(&chmp->chm_lock_mountfields));
KASSERT(mutex_owned(&chmp->chm_lock_sizes));
KASSERT(rw_write_held(&chmp->chm_lock_wbuf));
KASSERT(pad == WBUF_SETPAD || pad == WBUF_NOPAD);
/* check padding option */
if (pad == WBUF_SETPAD) {
chmp->chm_wbuf_len = PAD(chmp->chm_wbuf_len);
memset(chmp->chm_wbuf + chmp->chm_wbuf_len, 0,
chmp->chm_wbuf_pagesize - chmp->chm_wbuf_len);
/* add a padding node */
padnode = (void *)(chmp->chm_wbuf + chmp->chm_wbuf_len);
padnode->magic = htole16(CHFS_FS_MAGIC_BITMASK);
padnode->type = htole16(CHFS_NODETYPE_PADDING);
padnode->length = htole32(chmp->chm_wbuf_pagesize
- chmp->chm_wbuf_len);
padnode->hdr_crc = htole32(crc32(0, (uint8_t *)padnode,
sizeof(*padnode)-4));
nref = chfs_alloc_node_ref(chmp->chm_nextblock);
nref->nref_offset = chmp->chm_wbuf_ofs + chmp->chm_wbuf_len;
nref->nref_offset = CHFS_GET_OFS(nref->nref_offset) |
CHFS_OBSOLETE_NODE_MASK;
chmp->chm_wbuf_len = chmp->chm_wbuf_pagesize;
/* change sizes after padding node */
chfs_change_size_free(chmp, chmp->chm_nextblock,
-padnode->length);
chfs_change_size_wasted(chmp, chmp->chm_nextblock,
padnode->length);
}
/* write out the buffer */
ret = chfs_write_leb(chmp, chmp->chm_nextblock->lnr, chmp->chm_wbuf,
chmp->chm_wbuf_ofs, chmp->chm_wbuf_len, &retlen);
if (ret) {
return ret;
}
/* reset the buffer */
memset(chmp->chm_wbuf, 0xff, chmp->chm_wbuf_pagesize);
chmp->chm_wbuf_ofs += chmp->chm_wbuf_pagesize;
chmp->chm_wbuf_len = 0;
return 0;
}
/*
* chfs_fill_wbuf - write data to wbuf
* Return the len of the buf what we didn't write to the wbuf.
*/
static size_t
chfs_fill_wbuf(struct chfs_mount *chmp, const u_char *buf, size_t len)
{
/* check available space */
if (len && !chmp->chm_wbuf_len && (len >= chmp->chm_wbuf_pagesize)) {
return 0;
}
/* check buffer's length */
if (len > (chmp->chm_wbuf_pagesize - chmp->chm_wbuf_len)) {
len = chmp->chm_wbuf_pagesize - chmp->chm_wbuf_len;
}
/* write into the wbuf */
memcpy(chmp->chm_wbuf + chmp->chm_wbuf_len, buf, len);
/* update the actual length of writebuffer */
chmp->chm_wbuf_len += (int) len;
return len;
}
/*
* chfs_write_wbuf - write to wbuf and then the flash
* Returns zero in case of success.
*/
int
chfs_write_wbuf(struct chfs_mount* chmp, const struct iovec *invecs, long count,
off_t to, size_t *retlen)
{
int invec, ret = 0;
size_t wbuf_retlen, donelen = 0;
int outvec_to = to;
int lnr = chmp->chm_nextblock->lnr;
KASSERT(mutex_owned(&chmp->chm_lock_mountfields));
KASSERT(mutex_owned(&chmp->chm_lock_sizes));
KASSERT(!rw_write_held(&chmp->chm_lock_wbuf));
rw_enter(&chmp->chm_lock_wbuf, RW_WRITER);
if (chmp->chm_wbuf_ofs == 0xffffffff) {
chmp->chm_wbuf_ofs = PAGE_DIV(to);
chmp->chm_wbuf_len = PAGE_MOD(to);
memset(chmp->chm_wbuf, 0xff, chmp->chm_wbuf_pagesize);
}
if (EB_ADDRESS(to) != EB_ADDRESS(chmp->chm_wbuf_ofs)) {
if (chmp->chm_wbuf_len) {
ret = chfs_flush_wbuf(chmp, WBUF_SETPAD);
if (ret)
goto outerr;
}
chmp->chm_wbuf_ofs = PAGE_DIV(to);
chmp->chm_wbuf_len = PAGE_MOD(to);
}
if (to != PAD(chmp->chm_wbuf_ofs + chmp->chm_wbuf_len)) {
dbg("to: %llu != %zu\n", (unsigned long long)to,
PAD(chmp->chm_wbuf_ofs + chmp->chm_wbuf_len));
dbg("Non-contiguous write\n");
panic("BUG\n");
}
/* adjust alignment offset */
if (chmp->chm_wbuf_len != PAGE_MOD(to)) {
chmp->chm_wbuf_len = PAGE_MOD(to);
/* take care of alignment to next page */
if (!chmp->chm_wbuf_len) {
chmp->chm_wbuf_len += chmp->chm_wbuf_pagesize;
ret = chfs_flush_wbuf(chmp, WBUF_NOPAD);
if (ret)
goto outerr;
}
}
for (invec = 0; invec < count; invec++) {
int vlen = invecs[invec].iov_len;
u_char* v = invecs[invec].iov_base;
/* fill the whole wbuf */
wbuf_retlen = chfs_fill_wbuf(chmp, v, vlen);
if (chmp->chm_wbuf_len == chmp->chm_wbuf_pagesize) {
ret = chfs_flush_wbuf(chmp, WBUF_NOPAD);
if (ret) {
goto outerr;
}
}
vlen -= wbuf_retlen;
outvec_to += wbuf_retlen;
v += wbuf_retlen;
donelen += wbuf_retlen;
/* if there is more residual data than the length of the wbuf
* write it out directly until it fits in the wbuf */
if (vlen >= chmp->chm_wbuf_pagesize) {
ret = chfs_write_leb(chmp, lnr, v, outvec_to, PAGE_DIV(vlen), &wbuf_retlen);
vlen -= wbuf_retlen;
outvec_to += wbuf_retlen;
chmp->chm_wbuf_ofs = outvec_to;
v += wbuf_retlen;
donelen += wbuf_retlen;
}
/* write the residual data to the wbuf */
wbuf_retlen = chfs_fill_wbuf(chmp, v, vlen);
if (chmp->chm_wbuf_len == chmp->chm_wbuf_pagesize) {
ret = chfs_flush_wbuf(chmp, WBUF_NOPAD);
if (ret)
goto outerr;
}
outvec_to += wbuf_retlen;
donelen += wbuf_retlen;
}
*retlen = donelen;
rw_exit(&chmp->chm_lock_wbuf);
return ret;
outerr:
*retlen = 0;
return ret;
}
/*
* chfs_flush_peding_wbuf - write wbuf to the flash
* Used when we must flush wbuf right now.
* If wbuf has free space, pad it to the size of wbuf and write out.
*/
int chfs_flush_pending_wbuf(struct chfs_mount *chmp)
{
int err;
KASSERT(mutex_owned(&chmp->chm_lock_mountfields));
mutex_enter(&chmp->chm_lock_sizes);
rw_enter(&chmp->chm_lock_wbuf, RW_WRITER);
err = chfs_flush_wbuf(chmp, WBUF_SETPAD);
rw_exit(&chmp->chm_lock_wbuf);
mutex_exit(&chmp->chm_lock_sizes);
return err;
}
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