| /* |
| * Copyright (c) 2016-2021 Douglas Gilbert. |
| * All rights reserved. |
| * Use of this source code is governed by a BSD-style |
| * license that can be found in the BSD_LICENSE file. |
| * |
| * SPDX-License-Identifier: BSD-2-Clause |
| */ |
| |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdbool.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <getopt.h> |
| #define __STDC_FORMAT_MACROS 1 |
| #include <inttypes.h> |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| #include "sg_lib.h" |
| #include "sg_lib_data.h" |
| #include "sg_pt.h" |
| #include "sg_cmds_basic.h" |
| #include "sg_unaligned.h" |
| #include "sg_pr2serr.h" |
| |
| /* A utility program originally written for the Linux OS SCSI subsystem. |
| * |
| * |
| * This program issues the SCSI BACKGROUND CONTROL command to the given SCSI |
| * device. Based on sbc4r10.pdf . |
| */ |
| |
| static const char * version_str = "1.13 20211114"; |
| |
| #define BACKGROUND_CONTROL_SA 0x15 |
| |
| #define SENSE_BUFF_LEN 64 /* Arbitrary, could be larger */ |
| #define DEF_PT_TIMEOUT 60 /* 60 seconds */ |
| |
| static const char * cmd_name = "Background control"; |
| |
| |
| static struct option long_options[] = { |
| {"ctl", required_argument, 0, 'c'}, |
| {"help", no_argument, 0, 'h'}, |
| {"time", required_argument, 0, 't'}, |
| {"verbose", no_argument, 0, 'v'}, |
| {"version", no_argument, 0, 'V'}, |
| {0, 0, 0, 0}, |
| }; |
| |
| |
| static void |
| usage() |
| { |
| pr2serr("Usage: " |
| "sg_bg_ctl [--ctl=CTL] [--help] [--time=TN] [--verbose] " |
| "[--version]\n" |
| " DEVICE\n"); |
| pr2serr(" where:\n" |
| " --ctl=CTL|-c CTL CTL is background operation control " |
| "value\n" |
| " default: 0 -> don't change background " |
| "operations\n" |
| " 1 -> start; 2 -> stop\n" |
| " --help|-h print out usage message\n" |
| " --time=TN|-t TN TN (units 100 ms) is max time to perform " |
| "background\n" |
| " operations (def: 0 -> no limit)\n" |
| " --verbose|-v increase verbosity\n" |
| " --version|-V print version string and exit\n\n" |
| "Performs a SCSI BACKGROUND CONTROL command. It can start or " |
| "stop\n'advanced background operations'. Operations started by " |
| "this command\n(i.e. when ctl=1) are termed as 'host initiated' " |
| "and allow a resource or\nthin provisioned device (disk) to " |
| "perform garbage collection type operations.\nThese may " |
| "degrade performance while they occur. Hence it is best to\n" |
| "perform this action while the computer is not too busy.\n"); |
| } |
| |
| /* Invokes a SCSI BACKGROUND CONTROL command (SBC-4). Return of 0 -> success, |
| * various SG_LIB_CAT_* positive values or -1 -> other errors */ |
| static int |
| sg_ll_background_control(int sg_fd, unsigned int bo_ctl, unsigned int bo_time, |
| bool noisy, int verbose) |
| { |
| int ret, res, sense_cat; |
| uint8_t bcCDB[16] = {SG_SERVICE_ACTION_IN_16, |
| BACKGROUND_CONTROL_SA, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 0, 0, 0, 0}; |
| uint8_t sense_b[SENSE_BUFF_LEN] SG_C_CPP_ZERO_INIT; |
| struct sg_pt_base * ptvp; |
| |
| if (bo_ctl) |
| bcCDB[2] |= (bo_ctl & 0x3) << 6; |
| if (bo_time) |
| bcCDB[3] = bo_time; |
| if (verbose) { |
| char b[128]; |
| |
| pr2serr(" %s cdb: %s\n", cmd_name, |
| sg_get_command_str(bcCDB, (int)sizeof(bcCDB), false, |
| sizeof(b), b)); |
| } |
| |
| ptvp = construct_scsi_pt_obj(); |
| if (NULL == ptvp) { |
| pr2serr("%s: out of memory\n", cmd_name); |
| return -1; |
| } |
| set_scsi_pt_cdb(ptvp, bcCDB, sizeof(bcCDB)); |
| set_scsi_pt_sense(ptvp, sense_b, sizeof(sense_b)); |
| res = do_scsi_pt(ptvp, sg_fd, DEF_PT_TIMEOUT, verbose); |
| ret = sg_cmds_process_resp(ptvp, cmd_name, res, noisy, verbose, |
| &sense_cat); |
| if (-1 == ret) { |
| if (get_scsi_pt_transport_err(ptvp)) |
| ret = SG_LIB_TRANSPORT_ERROR; |
| else |
| ret = sg_convert_errno(get_scsi_pt_os_err(ptvp)); |
| } else if (-2 == ret) { |
| switch (sense_cat) { |
| case SG_LIB_CAT_RECOVERED: |
| case SG_LIB_CAT_NO_SENSE: |
| ret = 0; |
| break; |
| default: |
| ret = sense_cat; |
| break; |
| } |
| } else |
| ret = 0; |
| destruct_scsi_pt_obj(ptvp); |
| return ret; |
| } |
| |
| |
| int |
| main(int argc, char * argv[]) |
| { |
| bool verbose_given = false; |
| bool version_given = false; |
| int sg_fd = -1; |
| int res, c; |
| unsigned int ctl = 0; |
| unsigned int time_tnth = 0; |
| int verbose = 0; |
| const char * device_name = NULL; |
| int ret = 0; |
| |
| while (1) { |
| int option_index = 0; |
| |
| c = getopt_long(argc, argv, "c:ht:vV", long_options, &option_index); |
| if (c == -1) |
| break; |
| |
| switch (c) { |
| case 'c': |
| if ((1 != sscanf(optarg, "%4u", &ctl)) || (ctl > 3)) { |
| pr2serr("--ctl= expects a number from 0 to 3\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| break; |
| case 'h': |
| case '?': |
| usage(); |
| return 0; |
| case 't': |
| if ((1 != sscanf(optarg, "%4u", &time_tnth)) || |
| (time_tnth > 255)) { |
| pr2serr("--time= expects a number from 0 to 255\n"); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| break; |
| case 'v': |
| verbose_given = true; |
| ++verbose; |
| break; |
| case 'V': |
| version_given = true; |
| break; |
| default: |
| pr2serr("unrecognised option code 0x%x ??\n", c); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } |
| if (optind < argc) { |
| if (NULL == device_name) { |
| device_name = argv[optind]; |
| ++optind; |
| } |
| if (optind < argc) { |
| for (; optind < argc; ++optind) |
| pr2serr("Unexpected extra argument: %s\n", |
| argv[optind]); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| } |
| #ifdef DEBUG |
| pr2serr("In DEBUG mode, "); |
| if (verbose_given && version_given) { |
| pr2serr("but override: '-vV' given, zero verbose and continue\n"); |
| verbose_given = false; |
| version_given = false; |
| verbose = 0; |
| } else if (! verbose_given) { |
| pr2serr("set '-vv'\n"); |
| verbose = 2; |
| } else |
| pr2serr("keep verbose=%d\n", verbose); |
| #else |
| if (verbose_given && version_given) |
| pr2serr("Not in DEBUG mode, so '-vV' has no special action\n"); |
| #endif |
| if (version_given) { |
| pr2serr("version: %s\n", version_str); |
| return 0; |
| } |
| |
| if (NULL == device_name) { |
| pr2serr("missing device name!\n\n"); |
| usage(); |
| return SG_LIB_SYNTAX_ERROR; |
| } |
| |
| sg_fd = sg_cmds_open_device(device_name, false, verbose); |
| if (sg_fd < 0) { |
| if (verbose) |
| pr2serr("open error: %s: %s\n", device_name, |
| safe_strerror(-sg_fd)); |
| ret = sg_convert_errno(-sg_fd); |
| goto fini; |
| } |
| |
| res = sg_ll_background_control(sg_fd, ctl, time_tnth, true, verbose); |
| ret = res; |
| if (res) { |
| if (SG_LIB_CAT_INVALID_OP == res) |
| pr2serr("%s command not supported\n", cmd_name); |
| else { |
| char b[80]; |
| |
| sg_get_category_sense_str(res, sizeof(b), b, verbose); |
| pr2serr("%s command: %s\n", cmd_name, b); |
| } |
| } |
| |
| fini: |
| if (0 == verbose) { |
| if (! sg_if_can2stderr("sg_bg_ctl failed: ", ret)) |
| pr2serr("Some error occurred, try again with '-v' or '-vv' for " |
| "more information\n"); |
| } |
| if (sg_fd >= 0) { |
| res = sg_cmds_close_device(sg_fd); |
| if (res < 0) { |
| pr2serr("close error: %s\n", safe_strerror(-res)); |
| if (0 == ret) |
| ret = sg_convert_errno(-res); |
| } |
| } |
| return (ret >= 0) ? ret : SG_LIB_CAT_OTHER; |
| } |
