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minix/sys/fs/udf/udf_strat_direct.c

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/* $NetBSD: udf_strat_direct.c,v 1.12 2013/10/30 08:41:38 mrg Exp $ */
/*
* Copyright (c) 2006, 2008 Reinoud Zandijk
* 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 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>
#ifndef lint
__KERNEL_RCSID(0, "$NetBSD: udf_strat_direct.c,v 1.12 2013/10/30 08:41:38 mrg Exp $");
#endif /* not lint */
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <miscfs/genfs/genfs_node.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/device.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/kauth.h>
#include <sys/kthread.h>
#include <dev/clock_subr.h>
#include <fs/udf/ecma167-udf.h>
#include <fs/udf/udf_mount.h>
#include "udf.h"
#include "udf_subr.h"
#include "udf_bswap.h"
#define VTOI(vnode) ((struct udf_node *) vnode->v_data)
#define PRIV(ump) ((struct strat_private *) ump->strategy_private)
/* --------------------------------------------------------------------- */
/* BUFQ's */
#define UDF_SHED_MAX 3
#define UDF_SHED_READING 0
#define UDF_SHED_WRITING 1
#define UDF_SHED_SEQWRITING 2
struct strat_private {
struct pool desc_pool; /* node descriptors */
};
/* --------------------------------------------------------------------- */
static void
udf_wr_nodedscr_callback(struct buf *buf)
{
struct udf_node *udf_node;
KASSERT(buf);
KASSERT(buf->b_data);
/* called when write action is done */
DPRINTF(WRITE, ("udf_wr_nodedscr_callback(): node written out\n"));
udf_node = VTOI(buf->b_vp);
if (udf_node == NULL) {
putiobuf(buf);
printf("udf_wr_node_callback: NULL node?\n");
return;
}
/* XXX right flags to mark dirty again on error? */
if (buf->b_error) {
/* write error on `defect free' media??? how to solve? */
/* XXX lookup UDF standard for unallocatable space */
udf_node->i_flags |= IN_MODIFIED | IN_ACCESSED;
}
/* decrement outstanding_nodedscr */
KASSERT(udf_node->outstanding_nodedscr >= 1);
udf_node->outstanding_nodedscr--;
if (udf_node->outstanding_nodedscr == 0) {
/* unlock the node */
UDF_UNLOCK_NODE(udf_node, 0);
wakeup(&udf_node->outstanding_nodedscr);
}
/* unreference the vnode so it can be recycled */
holdrele(udf_node->vnode);
putiobuf(buf);
}
/* --------------------------------------------------------------------- */
static int
udf_getblank_nodedscr_direct(struct udf_strat_args *args)
{
union dscrptr **dscrptr = &args->dscr;
struct udf_mount *ump = args->ump;
struct strat_private *priv = PRIV(ump);
uint32_t lb_size;
lb_size = udf_rw32(ump->logical_vol->lb_size);
*dscrptr = pool_get(&priv->desc_pool, PR_WAITOK);
memset(*dscrptr, 0, lb_size);
return 0;
}
static void
udf_free_nodedscr_direct(struct udf_strat_args *args)
{
union dscrptr *dscr = args->dscr;
struct udf_mount *ump = args->ump;
struct strat_private *priv = PRIV(ump);
pool_put(&priv->desc_pool, dscr);
}
static int
udf_read_nodedscr_direct(struct udf_strat_args *args)
{
union dscrptr **dscrptr = &args->dscr;
union dscrptr *tmpdscr;
struct udf_mount *ump = args->ump;
struct long_ad *icb = args->icb;
struct strat_private *priv = PRIV(ump);
uint32_t lb_size;
uint32_t sector, dummy;
int error;
lb_size = udf_rw32(ump->logical_vol->lb_size);
error = udf_translate_vtop(ump, icb, &sector, &dummy);
if (error)
return error;
/* try to read in fe/efe */
error = udf_read_phys_dscr(ump, sector, M_UDFTEMP, &tmpdscr);
if (error)
return error;
*dscrptr = pool_get(&priv->desc_pool, PR_WAITOK);
memcpy(*dscrptr, tmpdscr, lb_size);
free(tmpdscr, M_UDFTEMP);
return 0;
}
static int
udf_write_nodedscr_direct(struct udf_strat_args *args)
{
struct udf_mount *ump = args->ump;
struct udf_node *udf_node = args->udf_node;
union dscrptr *dscr = args->dscr;
struct long_ad *icb = args->icb;
int waitfor = args->waitfor;
uint32_t logsector, sector, dummy;
int error, vpart __diagused;
/*
* we have to decide if we write it out sequential or at its fixed
* position by examining the partition its (to be) written on.
*/
vpart = udf_rw16(udf_node->loc.loc.part_num);
logsector = udf_rw32(icb->loc.lb_num);
KASSERT(ump->vtop_tp[vpart] != UDF_VTOP_TYPE_VIRT);
sector = 0;
error = udf_translate_vtop(ump, icb, &sector, &dummy);
if (error)
goto out;
/* add reference to the vnode to prevent recycling */
vhold(udf_node->vnode);
if (waitfor) {
DPRINTF(WRITE, ("udf_write_nodedscr: sync write\n"));
error = udf_write_phys_dscr_sync(ump, udf_node, UDF_C_NODE,
dscr, sector, logsector);
} else {
DPRINTF(WRITE, ("udf_write_nodedscr: no wait, async write\n"));
error = udf_write_phys_dscr_async(ump, udf_node, UDF_C_NODE,
dscr, sector, logsector, udf_wr_nodedscr_callback);
/* will be UNLOCKED in call back */
return error;
}
holdrele(udf_node->vnode);
out:
udf_node->outstanding_nodedscr--;
if (udf_node->outstanding_nodedscr == 0) {
UDF_UNLOCK_NODE(udf_node, 0);
wakeup(&udf_node->outstanding_nodedscr);
}
return error;
}
/* --------------------------------------------------------------------- */
static void
udf_queue_buf_direct(struct udf_strat_args *args)
{
struct udf_mount *ump = args->ump;
struct buf *buf = args->nestbuf;
struct buf *nestbuf;
struct desc_tag *tag;
struct long_ad *node_ad_cpy;
uint64_t *lmapping, *pmapping, *lmappos, run_start;
uint32_t sectornr;
uint32_t buf_offset, rbuflen, bpos;
uint16_t vpart_num;
uint8_t *fidblk;
off_t rblk;
int sector_size = ump->discinfo.sector_size;
int len, buf_len, sector, sectors, run_length;
int blks = sector_size / DEV_BSIZE;
int what, class __diagused, queue;
KASSERT(ump);
KASSERT(buf);
KASSERT(buf->b_iodone == nestiobuf_iodone);
what = buf->b_udf_c_type;
queue = UDF_SHED_READING;
if ((buf->b_flags & B_READ) == 0) {
/* writing */
queue = UDF_SHED_SEQWRITING;
if (what == UDF_C_ABSOLUTE)
queue = UDF_SHED_WRITING;
if (what == UDF_C_DSCR)
queue = UDF_SHED_WRITING;
if (what == UDF_C_NODE)
queue = UDF_SHED_WRITING;
}
/* use disc sheduler */
class = ump->discinfo.mmc_class;
KASSERT((class == MMC_CLASS_UNKN) || (class == MMC_CLASS_DISC) ||
(ump->discinfo.mmc_cur & MMC_CAP_HW_DEFECTFREE) ||
(ump->vfs_mountp->mnt_flag & MNT_RDONLY));
#ifndef UDF_DEBUG
__USE(blks);
#endif
if (queue == UDF_SHED_READING) {
DPRINTF(SHEDULE, ("\nudf_issue_buf READ %p : sector %d type %d,"
"b_resid %d, b_bcount %d, b_bufsize %d\n",
buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
buf->b_resid, buf->b_bcount, buf->b_bufsize));
VOP_STRATEGY(ump->devvp, buf);
return;
}
if (queue == UDF_SHED_WRITING) {
DPRINTF(SHEDULE, ("\nudf_issue_buf WRITE %p : sector %d "
"type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
buf, (uint32_t) buf->b_blkno / blks, buf->b_udf_c_type,
buf->b_resid, buf->b_bcount, buf->b_bufsize));
KASSERT(buf->b_udf_c_type == UDF_C_DSCR ||
buf->b_udf_c_type == UDF_C_ABSOLUTE ||
buf->b_udf_c_type == UDF_C_NODE);
udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
VOP_STRATEGY(ump->devvp, buf);
return;
}
/* UDF_SHED_SEQWRITING */
KASSERT(queue == UDF_SHED_SEQWRITING);
DPRINTF(SHEDULE, ("\nudf_issue_buf SEQWRITE %p : sector XXXX "
"type %d, b_resid %d, b_bcount %d, b_bufsize %d\n",
buf, buf->b_udf_c_type, buf->b_resid, buf->b_bcount,
buf->b_bufsize));
/*
* Buffers should not have been allocated to disc addresses yet on
* this queue. Note that a buffer can get multiple extents allocated.
*
* lmapping contains lb_num relative to base partition.
*/
lmapping = ump->la_lmapping;
node_ad_cpy = ump->la_node_ad_cpy;
/* logically allocate buf and map it in the file */
udf_late_allocate_buf(ump, buf, lmapping, node_ad_cpy, &vpart_num);
/* if we have FIDs, fixup using the new allocation table */
if (buf->b_udf_c_type == UDF_C_FIDS) {
buf_len = buf->b_bcount;
bpos = 0;
lmappos = lmapping;
while (buf_len) {
sectornr = *lmappos++;
len = MIN(buf_len, sector_size);
fidblk = (uint8_t *) buf->b_data + bpos;
udf_fixup_fid_block(fidblk, sector_size,
0, len, sectornr);
bpos += len;
buf_len -= len;
}
}
if (buf->b_udf_c_type == UDF_C_METADATA_SBM) {
if (buf->b_lblkno == 0) {
/* update the tag location inside */
tag = (struct desc_tag *) buf->b_data;
tag->tag_loc = udf_rw32(*lmapping);
udf_validate_tag_and_crc_sums(buf->b_data);
}
}
udf_fixup_node_internals(ump, buf->b_data, buf->b_udf_c_type);
/*
* Translate new mappings in lmapping to pmappings and try to
* conglomerate extents to reduce the number of writes.
*
* pmapping to contain lb_nums as used for disc adressing.
*/
pmapping = ump->la_pmapping;
sectors = (buf->b_bcount + sector_size -1) / sector_size;
udf_translate_vtop_list(ump, sectors, vpart_num, lmapping, pmapping);
for (sector = 0; sector < sectors; sector++) {
buf_offset = sector * sector_size;
DPRINTF(WRITE, ("\tprocessing rel sector %d\n", sector));
DPRINTF(WRITE, ("\tissue write sector %"PRIu64"\n",
pmapping[sector]));
run_start = pmapping[sector];
run_length = 1;
while (sector < sectors-1) {
if (pmapping[sector+1] != pmapping[sector]+1)
break;
run_length++;
sector++;
}
/* nest an iobuf for the extent */
rbuflen = run_length * sector_size;
rblk = run_start * (sector_size/DEV_BSIZE);
nestbuf = getiobuf(NULL, true);
nestiobuf_setup(buf, nestbuf, buf_offset, rbuflen);
/* nestbuf is B_ASYNC */
/* identify this nestbuf */
nestbuf->b_lblkno = sector;
assert(nestbuf->b_vp == buf->b_vp);
/* CD shedules on raw blkno */
nestbuf->b_blkno = rblk;
nestbuf->b_proc = NULL;
nestbuf->b_rawblkno = rblk;
nestbuf->b_udf_c_type = UDF_C_PROCESSED;
VOP_STRATEGY(ump->devvp, nestbuf);
}
}
static void
udf_discstrat_init_direct(struct udf_strat_args *args)
{
struct udf_mount *ump = args->ump;
struct strat_private *priv = PRIV(ump);
uint32_t lb_size;
KASSERT(priv == NULL);
ump->strategy_private = malloc(sizeof(struct strat_private),
M_UDFTEMP, M_WAITOK);
priv = ump->strategy_private;
memset(priv, 0 , sizeof(struct strat_private));
/*
* Initialise pool for descriptors associated with nodes. This is done
* in lb_size units though currently lb_size is dictated to be
* sector_size.
*/
memset(&priv->desc_pool, 0, sizeof(struct pool));
lb_size = udf_rw32(ump->logical_vol->lb_size);
pool_init(&priv->desc_pool, lb_size, 0, 0, 0, "udf_desc_pool", NULL,
IPL_NONE);
}
static void
udf_discstrat_finish_direct(struct udf_strat_args *args)
{
struct udf_mount *ump = args->ump;
struct strat_private *priv = PRIV(ump);
/* destroy our pool */
pool_destroy(&priv->desc_pool);
/* free our private space */
free(ump->strategy_private, M_UDFTEMP);
ump->strategy_private = NULL;
}
/* --------------------------------------------------------------------- */
struct udf_strategy udf_strat_direct =
{
udf_getblank_nodedscr_direct,
udf_free_nodedscr_direct,
udf_read_nodedscr_direct,
udf_write_nodedscr_direct,
udf_queue_buf_direct,
udf_discstrat_init_direct,
udf_discstrat_finish_direct
};
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