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https://github.com/systemd/systemd-stable.git
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1aa1e24848
We never used any of the libsysfs convenience features. Here we replace it completely with 300 lines of code, which are much simpler and a bit faster cause udev(d) does not open any syfs file for a simple event which does not need any parent device information. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
263 lines
7.5 KiB
C
263 lines
7.5 KiB
C
/*
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* dasdlabel - read label from s390 block device
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*
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* Copyright (C) 2004 Arnd Bergmann <arnd@arndb.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include "../../udev.h"
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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static int udev_log = -1;
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if (udev_log == -1) {
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const char *value;
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value = getenv("UDEV_LOG");
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if (value)
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udev_log = log_priority(value);
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else
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udev_log = LOG_ERR;
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}
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if (priority > udev_log)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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/*
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* Only compile this on S/390. Doesn't make any sense
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* for other architectures.
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*/
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static unsigned char EBCtoASC[256] =
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{
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/* 0x00 NUL SOH STX ETX *SEL HT *RNL DEL */
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0x00, 0x01, 0x02, 0x03, 0x07, 0x09, 0x07, 0x7F,
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/* 0x08 -GE -SPS -RPT VT FF CR SO SI */
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0x07, 0x07, 0x07, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
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/* 0x10 DLE DC1 DC2 DC3 -RES -NL BS -POC
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-ENP ->LF */
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0x10, 0x11, 0x12, 0x13, 0x07, 0x0A, 0x08, 0x07,
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/* 0x18 CAN EM -UBS -CU1 -IFS -IGS -IRS -ITB
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-IUS */
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0x18, 0x19, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
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/* 0x20 -DS -SOS FS -WUS -BYP LF ETB ESC
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-INP */
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0x07, 0x07, 0x1C, 0x07, 0x07, 0x0A, 0x17, 0x1B,
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/* 0x28 -SA -SFE -SM -CSP -MFA ENQ ACK BEL
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-SW */
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0x07, 0x07, 0x07, 0x07, 0x07, 0x05, 0x06, 0x07,
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/* 0x30 ---- ---- SYN -IR -PP -TRN -NBS EOT */
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0x07, 0x07, 0x16, 0x07, 0x07, 0x07, 0x07, 0x04,
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/* 0x38 -SBS -IT -RFF -CU3 DC4 NAK ---- SUB */
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0x07, 0x07, 0x07, 0x07, 0x14, 0x15, 0x07, 0x1A,
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/* 0x40 SP RSP ä ---- */
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0x20, 0xFF, 0x83, 0x84, 0x85, 0xA0, 0x07, 0x86,
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/* 0x48 . < ( + | */
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0x87, 0xA4, 0x9B, 0x2E, 0x3C, 0x28, 0x2B, 0x7C,
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/* 0x50 & ---- */
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0x26, 0x82, 0x88, 0x89, 0x8A, 0xA1, 0x8C, 0x07,
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/* 0x58 ß ! $ * ) ; */
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0x8D, 0xE1, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0xAA,
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/* 0x60 - / ---- Ä ---- ---- ---- */
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0x2D, 0x2F, 0x07, 0x8E, 0x07, 0x07, 0x07, 0x8F,
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/* 0x68 ---- , % _ > ? */
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0x80, 0xA5, 0x07, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
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/* 0x70 --- ---- ---- ---- ---- ---- ---- */
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0x07, 0x90, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07,
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/* 0x78 * ` : # @ ' = " */
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0x70, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
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/* 0x80 * a b c d e f g */
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0x07, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
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/* 0x88 h i ---- ---- ---- */
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0x68, 0x69, 0xAE, 0xAF, 0x07, 0x07, 0x07, 0xF1,
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/* 0x90 ° j k l m n o p */
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0xF8, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70,
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/* 0x98 q r ---- ---- */
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0x71, 0x72, 0xA6, 0xA7, 0x91, 0x07, 0x92, 0x07,
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/* 0xA0 ~ s t u v w x */
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0xE6, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
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/* 0xA8 y z ---- ---- ---- ---- */
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0x79, 0x7A, 0xAD, 0xAB, 0x07, 0x07, 0x07, 0x07,
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/* 0xB0 ^ ---- § ---- */
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0x5E, 0x9C, 0x9D, 0xFA, 0x07, 0x07, 0x07, 0xAC,
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/* 0xB8 ---- [ ] ---- ---- ---- ---- */
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0xAB, 0x07, 0x5B, 0x5D, 0x07, 0x07, 0x07, 0x07,
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/* 0xC0 { A B C D E F G */
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0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
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/* 0xC8 H I ---- ö ---- */
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0x48, 0x49, 0x07, 0x93, 0x94, 0x95, 0xA2, 0x07,
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/* 0xD0 } J K L M N O P */
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0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
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/* 0xD8 Q R ---- ü */
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0x51, 0x52, 0x07, 0x96, 0x81, 0x97, 0xA3, 0x98,
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/* 0xE0 \ S T U V W X */
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0x5C, 0xF6, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
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/* 0xE8 Y Z ---- Ö ---- ---- ---- */
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0x59, 0x5A, 0xFD, 0x07, 0x99, 0x07, 0x07, 0x07,
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/* 0xF0 0 1 2 3 4 5 6 7 */
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
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/* 0xF8 8 9 ---- ---- Ü ---- ---- ---- */
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0x38, 0x39, 0x07, 0x07, 0x9A, 0x07, 0x07, 0x07
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};
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static void vtoc_ebcdic_dec (const unsigned char *source, unsigned char *target, int l)
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{
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int i;
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for (i = 0; i < l; i++)
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target[i]=(char)EBCtoASC[(unsigned char)(source[i])];
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}
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/*
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* struct dasd_information_t
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* represents any data about the data, which is visible to userspace
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*/
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typedef struct dasd_information_t {
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unsigned int devno; /* S/390 devno */
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unsigned int real_devno; /* for aliases */
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unsigned int schid; /* S/390 subchannel identifier */
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unsigned int cu_type : 16; /* from SenseID */
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unsigned int cu_model : 8; /* from SenseID */
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unsigned int dev_type : 16; /* from SenseID */
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unsigned int dev_model : 8; /* from SenseID */
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unsigned int open_count;
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unsigned int req_queue_len;
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unsigned int chanq_len; /* length of chanq */
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char type[4]; /* from discipline.name, 'none' for unknown */
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unsigned int status; /* current device level */
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unsigned int label_block; /* where to find the VOLSER */
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unsigned int FBA_layout; /* fixed block size (like AIXVOL) */
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unsigned int characteristics_size;
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unsigned int confdata_size;
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char characteristics[64]; /* from read_device_characteristics */
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char configuration_data[256]; /* from read_configuration_data */
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} dasd_information_t;
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#define DASD_IOCTL_LETTER 'D'
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#define BIODASDINFO _IOR(DASD_IOCTL_LETTER,1,dasd_information_t)
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#define BLKSSZGET _IO(0x12,104)
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unsigned char serial[8];
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static int dasd_id(int fd)
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{
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int blocksize;
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dasd_information_t info;
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unsigned char *data;
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unsigned char *label_raw;
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if (ioctl(fd, BIODASDINFO, &info) != 0) {
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dbg("not a dasd");
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return -1;
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}
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if (ioctl(fd, BLKSSZGET, &blocksize) != 0) {
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err("failed to get blocksize");
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return -1;
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}
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if (lseek(fd,info.label_block * blocksize, SEEK_SET) == -1) {
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err("seek failed on dasd");
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return -1;
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}
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data = malloc(blocksize);
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if (data == NULL)
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return -1;
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if (read(fd, data, blocksize) == -1) {
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err("read disklabel failed");
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free(data);
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return -1;
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}
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if ((!info.FBA_layout) && (!strcmp(info.type, "ECKD")))
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label_raw = &data[8];
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else
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label_raw = &data[4];
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serial[6] = '\0';
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vtoc_ebcdic_dec(label_raw, serial, 6);
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free(data);
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return 0;
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}
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int main(int argc, char *argv[])
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{
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const char *node = NULL;
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int i;
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int export = 0;
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int fd;
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int rc = 0;
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logging_init("dasd_id");
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for (i = 1; i < argc; i++) {
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char *arg = argv[i];
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if (strcmp(arg, "--export") == 0) {
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export = 1;
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} else
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node = arg;
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}
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if (!node) {
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err("no node specified");
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rc = 1;
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goto exit;
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}
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fd = open(node, O_RDONLY);
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if (fd < 0) {
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err("unable to open '%s'", node);
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rc = 1;
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goto exit;
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}
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if (dasd_id(fd) < 0) {
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err("dasd_id failed: %s", strerror(errno));
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rc = 1;
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}
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if (export) {
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printf("ID_TYPE=disk\n");
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printf("ID_SERIAL=%s\n",serial);
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printf("ID_BUS=ccw\n");
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} else
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printf("%s\n", serial);
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close(fd);
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exit:
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logging_close();
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return rc;
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}
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