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Diffstat (limited to 'testing/sg_tst_excl.cpp')
| -rw-r--r-- | testing/sg_tst_excl.cpp | 984 |
1 files changed, 984 insertions, 0 deletions
diff --git a/testing/sg_tst_excl.cpp b/testing/sg_tst_excl.cpp new file mode 100644 index 00000000..0354de60 --- /dev/null +++ b/testing/sg_tst_excl.cpp @@ -0,0 +1,984 @@ +/* + * Copyright (c) 2013-2022 Douglas Gilbert. + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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. + * + * SPDX-License-Identifier: BSD-2-Clause + */ + +#include <iostream> +#include <vector> +#include <system_error> +#include <thread> +#include <mutex> +#include <chrono> + +#include <unistd.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <sys/stat.h> + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#ifndef HAVE_LINUX_SG_V4_HDR + +/* Kernel uapi header contain __user decorations on user space pointers + * to indicate they are unsafe in the kernel space. However glibc takes + * all those __user decorations out from headers in /usr/include/linux . + * So to stop compile errors when directly importing include/uapi/scsi/sg.h + * undef __user before doing that include. */ +#define __user + +/* Want to block the original sg.h header from also being included. That + * causes lots of multiple definition errors. This will only work if this + * header is included _before_ the original sg.h header. */ +#define _SCSI_GENERIC_H /* original kernel header guard */ +#define _SCSI_SG_H /* glibc header guard */ + +#include "uapi_sg.h" /* local copy of include/uapi/scsi/sg.h */ + +#else +#define __user +#endif /* end of: ifndef HAVE_LINUX_SG_V4_HDR */ + +#include "sg_lib.h" +#include "sg_io_linux.h" +#include "sg_unaligned.h" + +static const char * version_str = "1.14 20220425"; +static const char * util_name = "sg_tst_excl"; + +/* This is a test program for checking O_EXCL on open() works. It uses + * multiple threads and can be run as multiple processes and attempts + * to "break" O_EXCL. The strategy is to open a device O_EXCL|O_NONBLOCK + * and do a double increment on a LB then close it. Prior to the first + * increment, the value is checked for even or odd. Assuming the count + * starts as an even (typically 0) then it should remain even. Odd instances + * are counted and reported at the end of the program, after all threads + * have completed. + * + * This is C++ code with some things from C++11 (e.g. threads) and was + * only just able to compile (when some things were reverted) with gcc/g++ + * version 4.7.3 found in Ubuntu 13.04 . C++11 "feature complete" support + * was not available until g++ version 4.8.1 and that is only currently + * found in Fedora 19 . + * + * The build uses various object files from the <sg3_utils>/lib directory + * which is assumed to be a sibling of this examples directory. Those + * object files in the lib directory can be built with: + * cd <sg3_utils> ; ./configure ; cd lib; make + * Then: + * cd ../testing + * make sg_tst_excl + * + * Currently this utility is Linux only and assumes the SG_IO v3 interface + * which is supported by sg and block devices (but not bsg devices which + * require the SG_IO v4 interface). This restriction is relaxed in the + * sg_tst_excl2 variant of this utility. + * + * BEWARE: this utility modifies a logical block (default LBA 1000) on the + * given device. + * + */ + +using namespace std; +using namespace std::chrono; + +#define DEF_NUM_PER_THREAD 200 +#define DEF_NUM_THREADS 4 +#define DEF_WAIT_MS 0 /* 0: yield; -1: don't wait; -2: sleep(0) */ + + +#define DEF_LBA 1000U + +#define EBUFF_SZ 256 + +static mutex odd_count_mutex; +static mutex console_mutex; +static unsigned int odd_count; +static unsigned int ebusy_count; +static unsigned int eagain_count; +static int sg_ifc_ver = 3; + + +static void +usage(void) +{ + printf("Usage: %s [-b] [-f] [-h] [-i <sg_ver>] [-l <lba>] " + "[-n <n_per_thr>]\n" + " [-t <num_thrs>] [-V] [-w <wait_ms>] " + "[-x] [-xx]\n" + " <sg_disk_device>\n", util_name); + printf(" where\n"); + printf(" -b block on open (def: O_NONBLOCK)\n"); + printf(" -f force: any SCSI disk (def: only " + "scsi_debug)\n"); + printf(" WARNING: <lba> written to\n"); + printf(" -h print this usage message then exit\n"); + printf(" -i <sg_ver> sg driver interface version (default: " + "3)\n"); + printf(" -l <lba> logical block to increment (def: %u)\n", + DEF_LBA); + printf(" -n <n_per_thr> number of loops per thread " + "(def: %d)\n", DEF_NUM_PER_THREAD); + printf(" -t <num_thrs> number of threads (def: %d)\n", + DEF_NUM_THREADS); + printf(" -V print version number then exit\n"); + printf(" -w <wait_ms> >0: sleep_for(<wait_ms>); =0: " + "yield(); -1: no\n" + " wait; -2: sleep(0) (def: %d)\n", + DEF_WAIT_MS); + printf(" -x don't use O_EXCL on first thread " + "(def: use\n" + " O_EXCL on all threads)\n" + " -xx don't use O_EXCL on any thread\n\n"); + printf("Test O_EXCL open flag with Linux sg driver. Each open/close " + "cycle with the\nO_EXCL flag does a double increment on " + "lba (using its first 4 bytes).\nEach increment uses a READ_16, " + "READ_16, increment, WRITE_16 cycle. The two\nREAD_16s are " + "launched asynchronously. Note that '-xx' will run test\n" + "without any O_EXCL flags.\n"); +} + + +#define READ16_REPLY_LEN 512 +#define READ16_CMD_LEN 16 +#define WRITE16_REPLY_LEN 512 +#define WRITE16_CMD_LEN 16 + +/* Opens dev_name and spins if busy (i.e. gets EBUSY), sleeping for + * wait_ms milliseconds if wait_ms is positive. + * Reads lba (twice) and treats the first 4 bytes as an int (SCSI endian), + * increments it and writes it back. Repeats so that happens twice. Then + * closes dev_name. If an error occurs returns -1 else returns 0 if + * first int read from lba is even otherwise returns 1. */ +static int +do_rd_inc_wr_twice_v3(const char * dev_name, unsigned int lba, int block, + int excl, int wait_ms, int id, unsigned int & ebusy, + unsigned int & eagains) +{ + bool odd = false; + int k, sg_fd; + struct sg_io_hdr pt, pt2; + unsigned char r16CmdBlk [READ16_CMD_LEN] = + {0x88, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}; + unsigned char w16CmdBlk [WRITE16_CMD_LEN] = + {0x8a, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}; + unsigned char sense_buffer[64] SG_C_CPP_ZERO_INIT; + unsigned char lb[READ16_REPLY_LEN]; + int open_flags = O_RDWR; + + sg_put_unaligned_be64(lba, r16CmdBlk + 2); + sg_put_unaligned_be64(lba, w16CmdBlk + 2); + if (! block) + open_flags |= O_NONBLOCK; + if (excl) + open_flags |= O_EXCL; + + while (((sg_fd = open(dev_name, open_flags)) < 0) && + (EBUSY == errno)) { + ++ebusy; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (sg_fd < 0) { + char ebuff[EBUFF_SZ]; + + snprintf(ebuff, EBUFF_SZ, "%s: error opening file: %s", __func__, + dev_name); + perror(ebuff); + return -1; + } + + for (k = 0; k < 2; ++k) { + bool ok = false; + int res; + unsigned int u = 0; + + /* Prepare READ_16 command */ + memset(&pt, 0, sizeof(pt)); + pt.interface_id = 'S'; + pt.cmd_len = sizeof(r16CmdBlk); + pt.mx_sb_len = sizeof(sense_buffer); + pt.dxfer_direction = SG_DXFER_FROM_DEV; + pt.dxfer_len = READ16_REPLY_LEN; + pt.dxferp = lb; + pt.cmdp = r16CmdBlk; + pt.sbp = sense_buffer; + pt.timeout = 20000; /* 20000 millisecs == 20 seconds */ + pt.pack_id = id; + + // queue up two READ_16s to same LBA + if (write(sg_fd, &pt, sizeof(pt)) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" write(sg, READ_16)"); + } + close(sg_fd); + return -1; + } + pt2 = pt; + if (write(sg_fd, &pt2, sizeof(pt2)) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" write(sg, READ_16) 2"); + } + close(sg_fd); + return -1; + } + + while (((res = read(sg_fd, &pt, sizeof(pt))) < 0) && + (EAGAIN == errno)) { + ++eagains; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (res < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" read(sg, READ_16)"); + } + close(sg_fd); + return -1; + } + /* now for the error processing */ + switch (sg_err_category3(&pt)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "Recovered error on READ_16, continuing\n"); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_chk_n_print3("READ_16 command error", &pt, 1); + } + break; + } + if (ok) { + while (((res = read(sg_fd, &pt2, sizeof(pt2))) < 0) && + (EAGAIN == errno)) { + ++eagains; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (res < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" read(sg, READ_16) 2"); + } + close(sg_fd); + return -1; + } + pt = pt2; + /* now for the error processing */ + ok = false; + switch (sg_err_category3(&pt)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "%s: Recovered error on READ_16, " + "continuing 2\n", __func__); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_chk_n_print3("READ_16 command error 2", &pt, 1); + } + break; + } + } + if (! ok) { + close(sg_fd); + return -1; + } + + u = sg_get_unaligned_be32(lb); + // Assuming u starts test as even (probably 0), expect it to stay even + if (0 == k) + odd = (1 == (u % 2)); + ++u; + sg_put_unaligned_be32(u, lb); + + if (wait_ms > 0) /* allow daylight for bad things ... */ + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + + /* Prepare WRITE_16 command */ + memset(&pt, 0, sizeof(pt)); + pt.interface_id = 'S'; + pt.cmd_len = sizeof(w16CmdBlk); + pt.mx_sb_len = sizeof(sense_buffer); + pt.dxfer_direction = SG_DXFER_TO_DEV; + pt.dxfer_len = WRITE16_REPLY_LEN; + pt.dxferp = lb; + pt.cmdp = w16CmdBlk; + pt.sbp = sense_buffer; + pt.timeout = 20000; /* 20000 millisecs == 20 seconds */ + pt.pack_id = id; + + if (ioctl(sg_fd, SG_IO, &pt) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" WRITE_16 SG_IO ioctl error"); + } + close(sg_fd); + return -1; + } + /* now for the error processing */ + ok = false; + switch (sg_err_category3(&pt)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "%s: Recovered error on WRITE_16, " + "continuing\n", __func__); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_chk_n_print3("WRITE_16 command error", &pt, 1); + } + break; + } + if (! ok) { + close(sg_fd); + return -1; + } + } + close(sg_fd); + return (int)odd; +} + +/* Opens dev_name and spins if busy (i.e. gets EBUSY), sleeping for + * wait_ms milliseconds if wait_ms is positive. + * Reads lba (twice) and treats the first 4 bytes as an int (SCSI endian), + * increments it and writes it back. Repeats so that happens twice. Then + * closes dev_name. If an error occurs returns -1 else returns 0 if + * first int read from lba is even otherwise returns 1. */ +static int +do_rd_inc_wr_twice_v4(const char * dev_name, unsigned int lba, int block, + int excl, int wait_ms, int id, unsigned int & ebusy, + unsigned int & eagains) +{ + bool odd = false; + int k, sg_fd; + struct sg_io_v4 pt, pt2; + unsigned char r16CmdBlk [READ16_CMD_LEN] = + {0x88, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}; + unsigned char w16CmdBlk [WRITE16_CMD_LEN] = + {0x8a, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0}; + unsigned char sense_buffer[64] SG_C_CPP_ZERO_INIT; + unsigned char lb[READ16_REPLY_LEN]; + int open_flags = O_RDWR; + + sg_put_unaligned_be64(lba, r16CmdBlk + 2); + sg_put_unaligned_be64(lba, w16CmdBlk + 2); + if (! block) + open_flags |= O_NONBLOCK; + if (excl) + open_flags |= O_EXCL; + + while (((sg_fd = open(dev_name, open_flags)) < 0) && + (EBUSY == errno)) { + ++ebusy; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (sg_fd < 0) { + char ebuff[EBUFF_SZ]; + + snprintf(ebuff, EBUFF_SZ, "%s: error opening file: %s", __func__, + dev_name); + perror(ebuff); + return -1; + } + + for (k = 0; k < 2; ++k) { + bool ok = false; + int res; + unsigned int u = 0; + + /* Prepare READ_16 command */ + memset(&pt, 0, sizeof(pt)); + pt.guard = 'Q'; + pt.request_len = sizeof(r16CmdBlk); + pt.max_response_len = sizeof(sense_buffer); + // pt.dxfer_direction = SG_DXFER_FROM_DEV; + pt.din_xfer_len = READ16_REPLY_LEN; + pt.din_xferp = (uint64_t)(sg_uintptr_t)lb; + pt.request = (uint64_t)(sg_uintptr_t)r16CmdBlk; + pt.response = (uint64_t)(sg_uintptr_t)sense_buffer; + pt.timeout = 20000; /* 20000 millisecs == 20 seconds */ + pt.request_extra = id; /* pack_id field */ + + // queue up two READ_16s to same LBA + if (ioctl(sg_fd, SG_IOSUBMIT, &pt) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" write(sg, READ_16)"); + } + close(sg_fd); + return -1; + } + pt2 = pt; + if (ioctl(sg_fd, SG_IOSUBMIT, &pt2) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" write(sg, READ_16) 2"); + } + close(sg_fd); + return -1; + } + + while (((res = ioctl(sg_fd, SG_IORECEIVE, &pt)) < 0) && + (EAGAIN == errno)) { + ++eagains; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (res < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" read(sg, READ_16)"); + } + close(sg_fd); + return -1; + } + /* now for the error processing */ + switch (sg_err_category_new(pt.device_status, pt.transport_status, + pt.driver_status, sense_buffer, pt.response_len)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "Recovered error on READ_16, continuing\n"); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_linux_sense_print("READ_16 command error", + pt.device_status, pt.transport_status, + pt.driver_status, sense_buffer, + pt.response_len, true); + // sg_chk_n_print3("READ_16 command error", &pt, 1); + } + break; + } + if (ok) { + while (((res = ioctl(sg_fd, SG_IORECEIVE, &pt2)) < 0) && + (EAGAIN == errno)) { + ++eagains; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (res < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" read(sg, READ_16) 2"); + } + close(sg_fd); + return -1; + } + pt = pt2; + /* now for the error processing */ + ok = false; + switch (sg_err_category_new(pt.device_status, pt.transport_status, + pt.driver_status, sense_buffer, pt.response_len)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "%s: Recovered error on READ_16, " + "continuing 2\n", __func__); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_linux_sense_print("READ_16 command error 2", + pt.device_status, + pt.transport_status, + pt.driver_status, sense_buffer, + pt.response_len, true); + // sg_chk_n_print3("READ_16 command error 2", &pt, 1); + } + break; + } + } + if (! ok) { + close(sg_fd); + return -1; + } + + u = sg_get_unaligned_be32(lb); + // Assuming u starts test as even (probably 0), expect it to stay even + if (0 == k) + odd = (1 == (u % 2)); + ++u; + sg_put_unaligned_be32(u, lb); + + if (wait_ms > 0) /* allow daylight for bad things ... */ + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + + /* Prepare WRITE_16 command */ + memset(&pt, 0, sizeof(pt)); + pt.guard = 'Q'; + pt.request_len = sizeof(w16CmdBlk); + pt.max_response_len = sizeof(sense_buffer); + // pt.dxfer_direction = SG_DXFER_TO_DEV; + pt.dout_xfer_len = WRITE16_REPLY_LEN; + pt.dout_xferp = (uint64_t)(sg_uintptr_t)lb; + pt.request = (uint64_t)(sg_uintptr_t)w16CmdBlk; + pt.response = (uint64_t)(sg_uintptr_t)sense_buffer; + pt.timeout = 20000; /* 20000 millisecs == 20 seconds */ + pt.request_extra = id; /* pack_id field */ + + if (ioctl(sg_fd, SG_IO, &pt) < 0) { + { + lock_guard<mutex> lg(console_mutex); + + perror(" WRITE_16 SG_IO ioctl error"); + } + close(sg_fd); + return -1; + } + /* now for the error processing */ + ok = false; + switch (sg_err_category_new(pt.device_status, pt.transport_status, + pt.driver_status, sense_buffer, pt.response_len)) { + case SG_LIB_CAT_CLEAN: + ok = true; + break; + case SG_LIB_CAT_RECOVERED: + { + lock_guard<mutex> lg(console_mutex); + + fprintf(stderr, "%s: Recovered error on WRITE_16, " + "continuing\n", __func__); + } + ok = true; + break; + default: /* won't bother decoding other categories */ + { + lock_guard<mutex> lg(console_mutex); + + sg_linux_sense_print("WRITE_16 command error", + pt.device_status, pt.transport_status, + pt.driver_status, sense_buffer, + pt.response_len, true); + } + break; + } + if (! ok) { + close(sg_fd); + return -1; + } + } + close(sg_fd); + return odd; +} + + + +#define INQ_REPLY_LEN 96 +#define INQ_CMD_LEN 6 + +/* Send INQUIRY and fetches response. If okay puts PRODUCT ID field + * in b (up to m_blen bytes). Does not use O_EXCL flag. Returns 0 on success, + * else -1 . */ +static int +do_inquiry_prod_id(const char * dev_name, int block, int wait_ms, + unsigned int & ebusys, char * b, int b_mlen) +{ + int sg_fd, ok, ret; + struct sg_io_hdr pt; + unsigned char inqCmdBlk [INQ_CMD_LEN] = + {0x12, 0, 0, 0, INQ_REPLY_LEN, 0}; + unsigned char inqBuff[INQ_REPLY_LEN]; + unsigned char sense_buffer[64] SG_C_CPP_ZERO_INIT; + int open_flags = O_RDWR; /* O_EXCL | O_RDONLY fails with EPERM */ + + if (! block) + open_flags |= O_NONBLOCK; + while (((sg_fd = open(dev_name, open_flags)) < 0) && + (EBUSY == errno)) { + ++ebusys; + if (wait_ms > 0) + this_thread::sleep_for(milliseconds{wait_ms}); + else if (0 == wait_ms) + this_thread::yield(); + else if (-2 == wait_ms) + sleep(0); // process yield ?? + } + if (sg_fd < 0) { + char ebuff[EBUFF_SZ]; + + snprintf(ebuff, EBUFF_SZ, + "do_inquiry_prod_id: error opening file: %s", dev_name); + perror(ebuff); + return -1; + } + /* Prepare INQUIRY command */ + memset(&pt, 0, sizeof(pt)); + pt.interface_id = 'S'; + pt.cmd_len = sizeof(inqCmdBlk); + /* pt.iovec_count = 0; */ /* memset takes care of this */ + pt.mx_sb_len = sizeof(sense_buffer); + pt.dxfer_direction = SG_DXFER_FROM_DEV; + pt.dxfer_len = INQ_REPLY_LEN; + pt.dxferp = inqBuff; + pt.cmdp = inqCmdBlk; + pt.sbp = sense_buffer; + pt.timeout = 20000; /* 20000 millisecs == 20 seconds */ + /* pt.flags = 0; */ /* take defaults: indirect IO, etc */ + /* pt.pack_id = 0; */ + /* pt.usr_ptr = NULL; */ + + if (ioctl(sg_fd, SG_IO, &pt) < 0) { + perror("do_inquiry_prod_id: Inquiry SG_IO ioctl error"); + close(sg_fd); + return -1; + } + + /* now for the error processing */ + ok = 0; + switch (sg_err_category3(&pt)) { + case SG_LIB_CAT_CLEAN: + ok = 1; + break; + case SG_LIB_CAT_RECOVERED: + fprintf(stderr, "Recovered error on INQUIRY, continuing\n"); + ok = 1; + break; + default: /* won't bother decoding other categories */ + sg_chk_n_print3("INQUIRY command error", &pt, 1); + break; + } + if (ok) { + /* Good, so fetch Product ID from response, copy to 'b' */ + if (b_mlen > 0) { + if (b_mlen > 16) { + memcpy(b, inqBuff + 16, 16); + b[16] = '\0'; + } else { + memcpy(b, inqBuff + 16, b_mlen - 1); + b[b_mlen - 1] = '\0'; + } + } + ret = 0; + } else + ret = -1; + close(sg_fd); + return ret; +} + +static void +work_thread(const char * dev_name, unsigned int lba, int id, int block, + int excl, int num, int wait_ms) +{ + unsigned int thr_odd_count = 0; + unsigned int thr_ebusy_count = 0; + unsigned int thr_eagain_count = 0; + int k, res; + + { + lock_guard<mutex> lg(console_mutex); + + cerr << "Enter work_thread id=" << id << " excl=" << excl << " block=" + << block << endl; + } + for (k = 0; k < num; ++k) { + if (sg_ifc_ver == 3) + res = do_rd_inc_wr_twice_v3(dev_name, lba, block, excl, wait_ms, + k, thr_ebusy_count, thr_eagain_count); + else if (sg_ifc_ver == 4) + res = do_rd_inc_wr_twice_v4(dev_name, lba, block, excl, wait_ms, + k, thr_ebusy_count, thr_eagain_count); + else { + lock_guard<mutex> lg(console_mutex); + + cerr << "sg_ifc_ver=" << sg_ifc_ver << " not supported" << endl; + res = -1; + } + if (res < 0) + break; + if (res) + ++thr_odd_count; + } + { + lock_guard<mutex> lg(console_mutex); + + if (k < num) + cerr << "thread id=" << id << " FAILed at iteration: " << k << + '\n'; + else + cerr << "thread id=" << id << " normal exit" << '\n'; + } + { + lock_guard<mutex> lg(odd_count_mutex); + + odd_count += thr_odd_count; + ebusy_count += thr_ebusy_count; + eagain_count += thr_eagain_count; + } +} + + +int +main(int argc, char * argv[]) +{ + int k; + int block = 0; + int force = 0; + unsigned int lba = DEF_LBA; + int num_per_thread = DEF_NUM_PER_THREAD; + int num_threads = DEF_NUM_THREADS; + int wait_ms = DEF_WAIT_MS; + int no_o_excl = 0; + char * dev_name = NULL; + + for (k = 1; k < argc; ++k) { + if (0 == memcmp("-b", argv[k], 2)) + ++block; + else if (0 == memcmp("-f", argv[k], 2)) + ++force; + else if (0 == memcmp("-h", argv[k], 2)) { + usage(); + return 0; + } else if (0 == memcmp("-i", argv[k], 2)) { + ++k; + if ((k < argc) && isdigit(*argv[k])) + sg_ifc_ver = atoi(argv[k]); + else + break; + } else if (0 == memcmp("-l", argv[k], 2)) { + ++k; + if ((k < argc) && isdigit(*argv[k])) + lba = (unsigned int)atoi(argv[k]); + else + break; + } else if (0 == memcmp("-n", argv[k], 2)) { + ++k; + if ((k < argc) && isdigit(*argv[k])) + num_per_thread = atoi(argv[k]); + else + break; + } else if (0 == memcmp("-t", argv[k], 2)) { + ++k; + if ((k < argc) && isdigit(*argv[k])) + num_threads = atoi(argv[k]); + else + break; + } else if (0 == memcmp("-V", argv[k], 2)) { + printf("%s version: %s\n", util_name, version_str); + return 0; + } else if (0 == memcmp("-w", argv[k], 2)) { + ++k; + if ((k < argc) && (isdigit(*argv[k]) || ('-' == *argv[k]))) { + if ('-' == *argv[k]) + wait_ms = - atoi(argv[k] + 1); + else + wait_ms = atoi(argv[k]); + } else + break; + } else if (0 == memcmp("-xxx", argv[k], 4)) + no_o_excl += 3; + else if (0 == memcmp("-xx", argv[k], 3)) + no_o_excl += 2; + else if (0 == memcmp("-x", argv[k], 2)) + ++no_o_excl; + else if (*argv[k] == '-') { + printf("Unrecognized switch: %s\n", argv[k]); + dev_name = NULL; + break; + } + else if (! dev_name) + dev_name = argv[k]; + else { + printf("too many arguments\n"); + dev_name = 0; + break; + } + } + if (0 == dev_name) { + usage(); + return 1; + } + try { + struct stat a_stat; + + if (stat(dev_name, &a_stat) < 0) { + perror("stat() on dev_name failed"); + return 1; + } + if (! S_ISCHR(a_stat.st_mode)) { + fprintf(stderr, "%s should be a sg device which is a char " + "device. %s\n", dev_name, dev_name); + fprintf(stderr, "is not a char device and damage could be done " + "if it is a BLOCK\ndevice, exiting ...\n"); + return 1; + } + if (! force) { + char b[64]; + int res = do_inquiry_prod_id(dev_name, block, wait_ms, + ebusy_count, b, sizeof(b)); + + if (res) { + fprintf(stderr, "INQUIRY failed on %s\n", dev_name); + return 1; + } + // For safety, since <lba> written to, only permit scsi_debug + // devices. Bypass this with '-f' option. + if (0 != memcmp("scsi_debug", b, 10)) { + fprintf(stderr, "Since this utility writes to LBA %u, only " + "devices with scsi_debug\nproduct ID accepted.\n", + lba); + return 2; + } + } + + vector<thread *> vt; + + for (k = 0; k < num_threads; ++k) { + int excl = 1; + + if (no_o_excl > 1) + excl = 0; + else if ((0 == k) && (1 == no_o_excl)) + excl = 0; + + thread * tp = new thread {work_thread, dev_name, lba, k, block, + excl, num_per_thread, wait_ms}; + vt.push_back(tp); + } + + // g++ 4.7.3 didn't like range-for loop here + for (k = 0; k < (int)vt.size(); ++k) + vt[k]->join(); + + for (k = 0; k < (int)vt.size(); ++k) + delete vt[k]; + + if (no_o_excl) + cout << "Odd count: " << odd_count << endl; + else + cout << "Expecting odd count of 0, got " << odd_count << endl; + cout << "Number of EBUSYs: " << ebusy_count << endl; + cout << "Number of EAGAINs: " << eagain_count << endl; + + } + catch(system_error& e) { + cerr << "got a system_error exception: " << e.what() << '\n'; + auto ec = e.code(); + cerr << "category: " << ec.category().name() << '\n'; + cerr << "value: " << ec.value() << '\n'; + cerr << "message: " << ec.message() << '\n'; + cerr << "\nNote: if g++ may need '-pthread' or similar in " + "compile/link line" << '\n'; + } + catch(...) { + cerr << "got another exception: " << '\n'; + } + return 0; +} |