chiark / gitweb /
add edd_id tool to match BIOS EDD disk information
authorKay Sievers <kay.sievers@suse.de>
Tue, 6 Sep 2005 10:18:04 +0000 (12:18 +0200)
committerKay Sievers <kay.sievers@suse.de>
Tue, 6 Sep 2005 10:18:04 +0000 (12:18 +0200)
Thanks to:
    John Hull <John_Hull@Dell.com>
    Matt Domsch <Matt_Domsch@Dell.com>

Signed-off-by: Kay Sievers <kay.sievers@suse.de>
extras/edd_id/Makefile [new file with mode: 0644]
extras/edd_id/edd_id.c [new file with mode: 0644]
test/simple-build-check.sh

diff --git a/extras/edd_id/Makefile b/extras/edd_id/Makefile
new file mode 100644 (file)
index 0000000..627884a
--- /dev/null
@@ -0,0 +1,50 @@
+# Makefile for edd_id
+#
+# Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+
+PROG = edd_id
+
+all:   $(PROG)
+
+prefix =
+exec_prefix =  ${prefix}
+etcdir =       ${prefix}/etc
+sbindir =      ${exec_prefix}/sbin
+usrbindir =    ${exec_prefix}/usr/bin
+usrsbindir =   ${exec_prefix}/usr/sbin
+mandir =       ${prefix}/usr/share/man
+devddir =      ${etcdir}/dev.d/default
+configdir =    ${etcdir}/udev/
+initdir =      ${etcdir}/init.d/
+srcdir = .
+
+INSTALL = /usr/bin/install -c
+INSTALL_PROGRAM = ${INSTALL}
+INSTALL_DATA  = ${INSTALL} -m 644
+INSTALL_SCRIPT = ${INSTALL_PROGRAM}
+
+OBJS = $(PROG).o $(LIBUDEV)
+
+$(OBJS): $(HEADERS)
+
+.c.o:
+       $(QUIET) $(CC) $(CFLAGS) -c -o $@ $<
+
+$(PROG): $(OBJS) $(HEADERS)
+       $(QUIET) $(LD) $(LDFLAGS) -o $(PROG) $(OBJS) $(LIB_OBJS)
+
+clean:
+       rm -f $(PROG) $(OBJS)
+
+spotless: clean
+
+install: all
+       $(INSTALL_PROGRAM) $(PROG) $(DESTDIR)$(sbindir)/$(PROG)
+
+uninstall:
+       - rm $(DESTDIR)$(sbindir)/$(PROG)
diff --git a/extras/edd_id/edd_id.c b/extras/edd_id/edd_id.c
new file mode 100644 (file)
index 0000000..504aac3
--- /dev/null
@@ -0,0 +1,184 @@
+/*
+ * edd_id - naming of BIOS disk devices via EDD
+ *
+ * Copyright (C) 2005 John Hull <John_Hull@Dell.com>
+ * Copyright (C) 2005 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *     This program is free software; you can redistribute it and/or modify it
+ *     under the terms of the GNU General Public License as published by the
+ *     Free Software Foundation version 2 of the License.
+ *
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <errno.h>
+#include <dirent.h>
+#include <stdint.h>
+
+#include "../../logging.h"
+#include "../../udev_utils.h"
+
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
+{
+       va_list args;
+       static int udev_log = -1;
+
+       if (udev_log == -1) {
+               const char *value;
+
+               value = getenv("UDEV_LOG");
+               if (value)
+                       udev_log = log_priority(value);
+               else
+                       udev_log = LOG_ERR;
+       }
+
+       if (priority > udev_log)
+               return;
+
+       va_start(args, format);
+       vsyslog(priority, format, args);
+       va_end(args);
+}
+#endif
+
+int main(int argc, char *argv[])
+{
+       const char *node = NULL;
+       int i;
+       int export = 0;
+       uint32_t disk_id;
+       uint16_t mbr_valid;
+       struct dirent *dent;
+       int disk_fd;
+       int sysfs_fd;
+       DIR *dir = NULL;
+       int rc = 1;
+
+       logging_init("edd_id");
+
+       for (i = 1 ; i < argc; i++) {
+               char *arg = argv[i];
+
+               if (strcmp(arg, "--export") == 0) {
+                       export = 1;
+               } else
+                       node = arg;
+       }
+       if (!node) {
+               err("no node specified");
+               fprintf(stderr, "no node specified\n");
+               goto exit;
+       }
+
+       /* check for kernel support */
+       dir = opendir("/sys/firmware/edd");
+       if (!dir) {
+               info("no kernel EDD support");
+               fprintf(stderr, "no kernel EDD support\n");
+               rc = 2;
+               goto exit;
+       }
+
+       disk_fd = open(node, O_RDONLY);
+       if (disk_fd < 0) {
+               info("unable to open '%s'", node);
+               fprintf(stderr, "unable to open '%s'\n", node);
+               rc = 3;
+               goto closedir;
+       }
+
+       /* check for valid MBR signature */
+       if (lseek(disk_fd, 510, SEEK_SET) < 0) {
+               info("seek to MBR validity failed '%s'", node);
+               rc = 4;
+               goto close;
+       }
+       if (read(disk_fd, &mbr_valid, sizeof(mbr_valid)) != sizeof(mbr_valid)) {
+               info("read MBR validity failed '%s'", node);
+               rc = 5;
+               goto close;
+       }
+       if (mbr_valid != 0xAA55) {
+               fprintf(stderr, "no valid MBR signature '%s'\n", node);
+               info("no valid MBR signature '%s'", node);
+               rc=6;
+               goto close;
+       }
+
+       /* read EDD signature */
+       if (lseek(disk_fd, 440, SEEK_SET) < 0) {
+               info("seek to signature failed '%s'", node);
+               rc = 7;
+               goto close;
+       }
+       if (read(disk_fd, &disk_id, sizeof(disk_id)) != sizeof(disk_id)) {
+               info("read signature failed '%s'", node);
+               rc = 8;
+               goto close;
+       }
+       /* all zero is invalid */
+       info("read id 0x%08x from '%s'", disk_id, node);
+       if (disk_id == 0) {
+               fprintf(stderr, "no EDD signature '%s'\n", node);
+               info("'%s' signature is zero", node);
+               rc = 9;
+               goto close;
+       }
+
+       /* lookup signature in sysfs to determine the name */
+       for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+               char file[PATH_SIZE];
+               char sysfs_id_buf[256];
+               uint32_t sysfs_id;
+               ssize_t size;
+
+               if (dent->d_name[0] == '.')
+                       continue;
+
+               snprintf(file, sizeof(file), "/sys/firmware/edd/%s/mbr_signature", dent->d_name);
+               file[sizeof(file)-1] = '\0';
+
+               sysfs_fd = open(file, O_RDONLY);
+               if (sysfs_fd < 0) {
+                       info("unable to open sysfs '%s'", file);
+                       continue;
+               }
+
+               size = read(sysfs_fd, sysfs_id_buf, sizeof(sysfs_id_buf)-1);
+               close(sysfs_fd);
+               if (size < 0) {
+                       info("read sysfs '%s' failed", file);
+                       continue;
+               }
+               sysfs_id_buf[size] = '\0';
+               info("read '%s' from '%s'", sysfs_id_buf, file);
+
+               sysfs_id = strtoul(sysfs_id_buf, NULL, 16);
+               if (disk_id == sysfs_id) {
+                       if (export)
+                               printf("ID_EDD=%s\n", dent->d_name);
+                       else
+                               printf("%s\n", dent->d_name);
+                       rc = 0;
+                       break;
+               }
+       }
+
+close:
+       close(disk_fd);
+closedir:
+       closedir(dir);
+exit:
+       logging_close();
+       return rc;
+}
index ec18e51..27e5c93 100755 (executable)
@@ -8,6 +8,7 @@ EXTRAS="\
        extras/usb_id \
        extras/dasd_id \
        extras/cdrom_id \
+       extras/edd_id \
        extras/floppy \
        extras/run_directory \
        extras/firmware"