516 lines
11 KiB
C
516 lines
11 KiB
C
/* $NetBSD: dm_target_delay.c,v 1.2 2020/01/21 16:27:53 tkusumi Exp $ */
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/*
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* Copyright (c) 2020 The NetBSD Foundation, Inc.
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* Copyright (c) 2015 The DragonFly Project. All rights reserved.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Tomohiro Kusumi <tkusumi@netbsd.org>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dm_target_delay.c,v 1.2 2020/01/21 16:27:53 tkusumi Exp $");
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/buf.h>
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#include <sys/kmem.h>
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#include <sys/mutex.h>
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#include <sys/queue.h>
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#include <sys/callout.h>
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#include <sys/pool.h>
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#include <sys/kthread.h>
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#include "dm.h"
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struct dm_delay_buf {
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TAILQ_ENTRY(dm_delay_buf) entry;
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struct buf *bp;
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int expire;
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};
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TAILQ_HEAD(dm_delay_buf_list, dm_delay_buf);
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struct dm_delay_info {
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dm_pdev_t *pdev;
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uint64_t offset;
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int delay;
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int count;
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int enabled;
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struct dm_delay_buf_list buf_list;
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struct callout cal;
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kmutex_t buf_mtx;
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kmutex_t cal_mtx;
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kmutex_t token; /* lwkt_token in DragonFly */
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};
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typedef struct target_delay_config {
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struct dm_delay_info read;
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struct dm_delay_info write;
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int argc; /* either 3 or 6 */
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} dm_target_delay_config_t;
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static int _init(struct dm_delay_info*, char**);
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static int _table(struct dm_delay_info*, char*);
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static void _strategy(struct dm_delay_info*, struct buf*);
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static __inline void _submit(struct dm_delay_info*, struct buf*);
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static void _destroy(struct dm_delay_info*);
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static void _timeout(void*);
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static void _thread(void*);
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static __inline void _debug(struct dm_delay_info*, const char*);
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static struct pool pool;
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static bool pool_initialized = false;
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#ifdef DM_TARGET_MODULE
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/*
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* Every target can be compiled directly to dm driver or as a
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* separate module this part of target is used for loading targets
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* to dm driver.
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* Target can be unloaded from kernel only if there are no users of
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* it e.g. there are no devices which uses that target.
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*/
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#include <sys/kernel.h>
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#include <sys/module.h>
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MODULE(MODULE_CLASS_MISC, dm_target_delay, NULL);
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static int
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dm_target_delay_modcmd(modcmd_t cmd, void *arg)
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{
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dm_target_t *dmt;
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int r;
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switch (cmd) {
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case MODULE_CMD_INIT:
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if ((dmt = dm_target_lookup("delay")) != NULL) {
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dm_target_unbusy(dmt);
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return EEXIST;
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}
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dmt = dm_target_alloc("delay");
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dmt->version[0] = 1;
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dmt->version[1] = 0;
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dmt->version[2] = 0;
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dmt->init = &dm_target_delay_init;
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dmt->table = &dm_target_delay_table;
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dmt->strategy = &dm_target_delay_strategy;
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dmt->sync = &dm_target_delay_sync;
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dmt->destroy = &dm_target_delay_destroy;
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//dmt->upcall = &dm_target_delay_upcall;
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dmt->secsize = &dm_target_delay_secsize;
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dm_target_delay_pool_create();
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r = dm_target_insert(dmt);
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break;
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case MODULE_CMD_FINI:
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r = dm_target_rem("delay");
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dm_target_delay_pool_destroy();
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break;
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case MODULE_CMD_STAT:
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return ENOTTY;
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default:
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return ENOTTY;
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}
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return r;
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}
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#endif
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int
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dm_target_delay_init(dm_table_entry_t *table_en, int argc, char **argv)
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{
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dm_target_delay_config_t *tdc;
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int ret;
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if (argc != 3 && argc != 6) {
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printf("Delay target takes 3 or 6 args, %d given\n", argc);
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return EINVAL;
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}
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aprint_debug("Delay target init function called: argc=%d\n", argc);
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tdc = kmem_alloc(sizeof(dm_target_delay_config_t), KM_SLEEP);
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tdc->argc = argc;
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ret = _init(&tdc->read, argv);
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if (ret) {
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kmem_free(tdc, sizeof(*tdc));
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return ret;
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}
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if (argc == 6)
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argv += 3;
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ret = _init(&tdc->write, argv);
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if (ret) {
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dm_pdev_decr(tdc->read.pdev);
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kmem_free(tdc, sizeof(*tdc));
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return ret;
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}
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dm_table_add_deps(table_en, tdc->read.pdev);
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dm_table_add_deps(table_en, tdc->write.pdev);
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table_en->target_config = tdc;
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return 0;
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}
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static int
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_init(struct dm_delay_info *di, char **argv)
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{
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dm_pdev_t *dmp;
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int tmp;
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if (argv[0] == NULL)
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return EINVAL;
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if ((dmp = dm_pdev_insert(argv[0])) == NULL)
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return ENOENT;
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di->pdev = dmp;
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di->offset = atoi64(argv[1]);
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tmp = atoi64(argv[2]);
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di->delay = tmp * hz / 1000;
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di->count = 0;
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TAILQ_INIT(&di->buf_list);
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callout_init(&di->cal, 0);
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mutex_init(&di->buf_mtx, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&di->cal_mtx, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&di->token, MUTEX_DEFAULT, IPL_NONE);
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di->enabled = 1;
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if (kthread_create(PRI_NONE, 0, NULL, _thread, di, NULL,
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"dmdlthread")) {
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printf("Failed to create delay target's kthread\n");
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/* XXX cleanup ? */
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return EINVAL;
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}
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_debug(di, "init");
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return 0;
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}
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char *
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dm_target_delay_info(void *target_config)
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{
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dm_target_delay_config_t *tdc;
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char *params;
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tdc = target_config;
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KASSERT(tdc != NULL);
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aprint_debug("Delay target info function called\n");
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params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_SLEEP);
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snprintf(params, DM_MAX_PARAMS_SIZE, "%d %d", tdc->read.count,
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tdc->write.count);
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return params;
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}
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char *
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dm_target_delay_table(void *target_config)
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{
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dm_target_delay_config_t *tdc;
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char *params, *p;
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tdc = target_config;
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KASSERT(tdc != NULL);
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aprint_debug("Delay target table function called\n");
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params = kmem_alloc(DM_MAX_PARAMS_SIZE, KM_SLEEP);
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p = params;
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p += _table(&tdc->read, p);
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if (tdc->argc == 6) {
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p += snprintf(p, DM_MAX_PARAMS_SIZE, " ");
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_table(&tdc->write, p);
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}
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return params;
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}
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static int
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_table(struct dm_delay_info *di, char *p)
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{
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return snprintf(p, DM_MAX_PARAMS_SIZE, "%s %" PRIu64 " %d",
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di->pdev->udev_name, di->offset, di->delay);
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}
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int
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dm_target_delay_strategy(dm_table_entry_t *table_en, struct buf *bp)
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{
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dm_target_delay_config_t *tdc;
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struct dm_delay_info *di;
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tdc = table_en->target_config;
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KASSERT(tdc != NULL);
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if (bp->b_flags & B_READ)
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di = &tdc->read;
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else
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di = &tdc->write;
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if (di) {
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if (di->delay) {
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_strategy(di, bp);
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} else {
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_submit(di, bp);
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}
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} else {
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struct vnode *vnode = tdc->write.pdev->pdev_vnode;
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KASSERT(0);
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VOP_STRATEGY(vnode, bp);
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}
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return 0;
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}
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static void
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_strategy(struct dm_delay_info *di, struct buf *bp)
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{
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struct dm_delay_buf *dp;
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dp = pool_get(&pool, PR_WAITOK);
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dp->bp = bp;
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dp->expire = tick + di->delay;
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mutex_enter(&di->buf_mtx);
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di->count++;
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TAILQ_INSERT_TAIL(&di->buf_list, dp, entry);
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mutex_exit(&di->buf_mtx);
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mutex_enter(&di->cal_mtx);
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if (!callout_pending(&di->cal))
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callout_reset(&di->cal, di->delay, _timeout, di);
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mutex_exit(&di->cal_mtx);
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}
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static __inline void
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_submit(struct dm_delay_info *di, struct buf *bp)
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{
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_debug(di, "submit");
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bp->b_blkno += di->offset;
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VOP_STRATEGY(di->pdev->pdev_vnode, bp);
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}
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static void
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_submit_queue(struct dm_delay_info *di, int submit_all)
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{
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struct dm_delay_buf *dp;
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struct dm_delay_buf_list tmp_list;
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int next = -1;
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int reset = 0;
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_debug(di, "submitq");
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TAILQ_INIT(&tmp_list);
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mutex_enter(&di->buf_mtx);
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while ((dp = TAILQ_FIRST(&di->buf_list)) != NULL) {
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if (submit_all || tick > dp->expire) {
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TAILQ_REMOVE(&di->buf_list, dp, entry);
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TAILQ_INSERT_TAIL(&tmp_list, dp, entry);
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di->count--;
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continue;
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}
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if (reset == 0) {
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reset = 1;
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next = dp->expire;
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} else {
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next = lmin(next, dp->expire);
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}
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}
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mutex_exit(&di->buf_mtx);
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if (reset) {
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mutex_enter(&di->cal_mtx);
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callout_reset(&di->cal, next - tick, _timeout, di);
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mutex_exit(&di->cal_mtx);
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}
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while ((dp = TAILQ_FIRST(&tmp_list)) != NULL) {
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TAILQ_REMOVE(&tmp_list, dp, entry);
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_submit(di, dp->bp);
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pool_put(&pool, dp);
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}
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}
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int
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dm_target_delay_sync(dm_table_entry_t *table_en)
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{
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dm_target_delay_config_t *tdc;
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int cmd;
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tdc = table_en->target_config;
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cmd = 1;
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return VOP_IOCTL(tdc->write.pdev->pdev_vnode, DIOCCACHESYNC, &cmd,
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FREAD | FWRITE, kauth_cred_get());
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}
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int
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dm_target_delay_destroy(dm_table_entry_t *table_en)
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{
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dm_target_delay_config_t *tdc;
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tdc = table_en->target_config;
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if (tdc == NULL)
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goto out;
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_destroy(&tdc->read);
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_destroy(&tdc->write);
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kmem_free(tdc, sizeof(*tdc));
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out:
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/* Unbusy target so we can unload it */
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dm_target_unbusy(table_en->target);
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return 0;
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}
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static void
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_destroy(struct dm_delay_info *di)
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{
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_debug(di, "destroy");
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mutex_enter(&di->token);
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di->enabled = 0;
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mutex_enter(&di->cal_mtx);
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if (callout_pending(&di->cal))
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callout_halt(&di->cal, NULL);
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mutex_exit(&di->cal_mtx);
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_submit_queue(di, 1);
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mutex_exit(&di->token);
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wakeup(di);
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/* XXX race here (DragonFly uses lwkt_token instead of mutex) */
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tsleep(&di->enabled, 0, "dmdldestroy", 0);
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mutex_destroy(&di->token);
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mutex_destroy(&di->cal_mtx);
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mutex_destroy(&di->buf_mtx);
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dm_pdev_decr(di->pdev);
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}
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#if 0
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int
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dm_target_delay_upcall(dm_table_entry_t *table_en, struct buf *bp)
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{
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return 0;
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}
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#endif
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int
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dm_target_delay_secsize(dm_table_entry_t *table_en, unsigned int *secsizep)
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{
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dm_target_delay_config_t *tdc;
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unsigned int secsize;
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secsize = 0;
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tdc = table_en->target_config;
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if (tdc != NULL)
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secsize = tdc->write.pdev->pdev_secsize;
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*secsizep = secsize;
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return 0;
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}
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static void
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_timeout(void *arg)
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{
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struct dm_delay_info *di = arg;
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_debug(di, "timeout");
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wakeup(di);
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}
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static void
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_thread(void *arg)
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{
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struct dm_delay_info *di = arg;
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_debug(di, "thread init");
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mutex_enter(&di->token);
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while (di->enabled) {
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mutex_exit(&di->token);
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tsleep(di, 0, "dmdlthread", 0);
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_submit_queue(di, 0);
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mutex_enter(&di->token);
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}
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mutex_exit(&di->token);
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wakeup(&di->enabled);
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_debug(di, "thread exit");
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kthread_exit(0);
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}
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static __inline void
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_debug(struct dm_delay_info *di, const char *msg)
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{
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aprint_debug("%-8s: %d pdev=%s offset=%ju delay=%d count=%d\n",
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msg, di->enabled, di->pdev->name, (uintmax_t)di->offset, di->delay,
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di->count);
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}
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void
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dm_target_delay_pool_create(void)
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{
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if (!pool_initialized) {
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pool_init(&pool, sizeof(struct dm_delay_buf), 0, 0, 0,
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"dmdlobj", &pool_allocator_nointr, IPL_NONE);
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pool_initialized = true;
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aprint_debug("Delay target pool initialized\n");
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}
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}
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void
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dm_target_delay_pool_destroy(void)
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{
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if (pool_initialized) {
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pool_destroy(&pool);
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pool_initialized = false;
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aprint_debug("Delay target pool destroyed\n");
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}
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}
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