linux/drivers/target/target_core_tmr.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*******************************************************************************
 * Filename:  target_core_tmr.c
 *
 * This file contains SPC-3 task management infrastructure
 *
 * (c) Copyright 2009-2013 Datera, Inc.
 *
 * Nicholas A. Bellinger <[email protected]>
 *
 ******************************************************************************/

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/export.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>

#include "target_core_internal.h"
#include "target_core_alua.h"
#include "target_core_pr.h"

int core_tmr_alloc_req(
	struct se_cmd *se_cmd,
	void *fabric_tmr_ptr,
	u8 function,
	gfp_t gfp_flags)
{ … }
EXPORT_SYMBOL(…);

void core_tmr_release_req(struct se_tmr_req *tmr)
{ … }

static int target_check_cdb_and_preempt(struct list_head *list,
		struct se_cmd *cmd)
{ … }

static bool __target_check_io_state(struct se_cmd *se_cmd,
				    struct se_session *tmr_sess, bool tas)
{ … }

void core_tmr_abort_task(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct se_session *se_sess)
{ … }

static void core_tmr_drain_tmr_list(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct list_head *preempt_and_abort_list)
{ … }

/**
 * core_tmr_drain_state_list() - abort SCSI commands associated with a device
 *
 * @dev:       Device for which to abort outstanding SCSI commands.
 * @prout_cmd: Pointer to the SCSI PREEMPT AND ABORT if this function is called
 *             to realize the PREEMPT AND ABORT functionality.
 * @tmr_sess:  Session through which the LUN RESET has been received.
 * @tas:       Task Aborted Status (TAS) bit from the SCSI control mode page.
 *             A quote from SPC-4, paragraph "7.5.10 Control mode page":
 *             "A task aborted status (TAS) bit set to zero specifies that
 *             aborted commands shall be terminated by the device server
 *             without any response to the application client. A TAS bit set
 *             to one specifies that commands aborted by the actions of an I_T
 *             nexus other than the I_T nexus on which the command was
 *             received shall be completed with TASK ABORTED status."
 * @preempt_and_abort_list: For the PREEMPT AND ABORT functionality, a list
 *             with registrations that will be preempted.
 */
static void core_tmr_drain_state_list(
	struct se_device *dev,
	struct se_cmd *prout_cmd,
	struct se_session *tmr_sess,
	bool tas,
	struct list_head *preempt_and_abort_list)
{ … }

int core_tmr_lun_reset(
        struct se_device *dev,
        struct se_tmr_req *tmr,
        struct list_head *preempt_and_abort_list,
        struct se_cmd *prout_cmd)
{ … }