diff options
Diffstat (limited to 'src/sg_read_block_limits.c')
| -rw-r--r-- | src/sg_read_block_limits.c | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/src/sg_read_block_limits.c b/src/sg_read_block_limits.c new file mode 100644 index 00000000..4fc1fae6 --- /dev/null +++ b/src/sg_read_block_limits.c @@ -0,0 +1,282 @@ +/* + * Copyright (c) 2009-2022 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 <stdarg.h> +#include <stdbool.h> +#include <string.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_cmds_basic.h" +#include "sg_cmds_extra.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 READ BLOCK LIMITS command (SSC) to the given + * SCSI device. + */ + +static const char * version_str = "1.09 20221101"; + +#define DEF_READ_BLOCK_LIMITS_LEN 6 +#define MLIO_READ_BLOCK_LIMITS_LEN 20 +#define MAX_READ_BLOCK_LIMITS_LEN MLIO_READ_BLOCK_LIMITS_LEN + +static uint8_t readBlkLmtBuff[MAX_READ_BLOCK_LIMITS_LEN]; + + +static struct option long_options[] = { + {"help", no_argument, 0, 'h'}, + {"hex", no_argument, 0, 'H'}, + {"mloi", no_argument, 0, 'm'}, /* added in ssc4r02.pdf */ + {"raw", no_argument, 0, 'r'}, + {"readonly", no_argument, 0, 'R'}, + {"verbose", no_argument, 0, 'v'}, + {"version", no_argument, 0, 'V'}, + {0, 0, 0, 0}, +}; + + +static void +usage() +{ + pr2serr("Usage: sg_read_block_limits [--help] [--hex] [--mloi] " + "[--raw]\n" + " [--readonly] [--verbose] " + "[--version]\n" + " DEVICE\n" + " where:\n" + " --help|-h print out usage message\n" + " --hex|-H output response in hexadecimal\n" + " --mloi|-m output maximum logical object " + "identifier\n" + " --raw|-r output response in binary to stdout\n" + " --readonly|-R open DEVICE in read-only mode\n" + " --verbose|-v increase verbosity\n" + " --version|-V print version string and exit\n\n" + "Performs a SCSI READ BLOCK LIMITS command and decode the " + "response\n" + ); +} + +static void +dStrRaw(const char * str, int len) +{ + int k; + + for (k = 0; k < len; ++k) + printf("%c", str[k]); +} + +int +main(int argc, char * argv[]) +{ + bool do_mloi = false; + bool do_raw = false; + bool readonly = false; + bool verbose_given = false; + bool version_given = false; + int sg_fd, k, m, res, c, max_resp_len; + int resid = 0; + int actual_len = 0; + int do_hex = 0; + int verbose = 0; + int ret = 0; + uint32_t max_block_size; + uint64_t mloi; + uint16_t min_block_size; + uint8_t granularity; + const char * device_name = NULL; + + while (1) { + int option_index = 0; + + c = getopt_long(argc, argv, "hHmrRvV", long_options, + &option_index); + if (c == -1) + break; + + switch (c) { + case 'h': + case '?': + usage(); + return 0; + case 'H': + ++do_hex; + break; + case 'm': + do_mloi = true; + break; + case 'r': + do_raw = true; + break; + case 'R': + readonly = true; + break; + case 'v': + verbose_given = true; + ++verbose; + break; + case 'V': + version_given = true; + break; + default: + pr2serr("invalid option -%c ??\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) { + printf("version: %s\n", version_str); + return 0; + } + + if (NULL == device_name) { + pr2serr("missing device name!\n"); + usage(); + return SG_LIB_SYNTAX_ERROR; + } + + sg_fd = sg_cmds_open_device(device_name, readonly, 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 the_end2; + } + + max_resp_len = do_mloi ? MLIO_READ_BLOCK_LIMITS_LEN : + DEF_READ_BLOCK_LIMITS_LEN; + memset(readBlkLmtBuff, 0x0, sizeof(readBlkLmtBuff)); + res = sg_ll_read_block_limits_v2(sg_fd, do_mloi, readBlkLmtBuff, + max_resp_len, &resid, true, verbose); + ret = res; + if (0 == res) { + actual_len = max_resp_len - resid; + if (do_hex) { + int fl = -1; + + if (1 == do_hex) + fl = 1; + else if (2 == do_hex) + fl = 0; + hex2stdout(readBlkLmtBuff, actual_len, fl); + goto the_end; + } else if (do_raw) { + dStrRaw((const char *)readBlkLmtBuff, actual_len); + goto the_end; + } + + if (do_mloi) { + if (actual_len < MLIO_READ_BLOCK_LIMITS_LEN) { + pr2serr("Expected at least %d bytes in response but only " + "%d bytes\n", MLIO_READ_BLOCK_LIMITS_LEN, actual_len); + goto the_end; + } + printf("Read Block Limits (MLOI=1) results:\n"); + mloi = sg_get_unaligned_be64(readBlkLmtBuff + 12); + printf(" Maximum logical block identifier: %" PRIu64 "\n", + mloi); + } else { /* MLOI=0 (only case before ssc4r02.pdf) */ + if (actual_len < DEF_READ_BLOCK_LIMITS_LEN) { + pr2serr("Expected at least %d bytes in response but only " + "%d bytes\n", DEF_READ_BLOCK_LIMITS_LEN, actual_len); + goto the_end; + } + max_block_size = sg_get_unaligned_be32(readBlkLmtBuff + 0); + // first byte contains granularity field + granularity = (max_block_size >> 24) & 0x1F; + max_block_size = max_block_size & 0xFFFFFF; + min_block_size = sg_get_unaligned_be16(readBlkLmtBuff + 4); + k = min_block_size / 1024; + printf("Read Block Limits results:\n"); + printf(" Minimum block size: %u byte(s)", + (unsigned int)min_block_size); + if (k != 0) + printf(", %d KB", k); + printf("\n"); + k = max_block_size / 1024; + m = max_block_size / 1048576; + printf(" Maximum block size: %u byte(s)", + (unsigned int)max_block_size); + if (k != 0) + printf(", %d KB", k); + if (m != 0) + printf(", %d MB", m); + printf("\n"); + printf(" Granularity: %u", + (unsigned int)granularity); + printf("\n"); + } + } else { /* error detected */ + char b[80]; + + sg_get_category_sense_str(res, sizeof(b), b, verbose); + pr2serr("Read block limits: %s\n", b); + if (0 == verbose) + pr2serr(" try '-v' option for more information\n"); + } + +the_end: + 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); + } +the_end2: + if (0 == verbose) { + if (! sg_if_can2stderr("sg_read_block_limits failed: ", ret)) + pr2serr("Some error occurred, try again with '-v' or '-vv' for " + "more information\n"); + } + return (ret >= 0) ? ret : SG_LIB_CAT_OTHER; +} |