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-rw-r--r--extras/multipath/devinfo.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/extras/multipath/devinfo.c b/extras/multipath/devinfo.c
new file mode 100644
index 0000000000..a6b089f517
--- /dev/null
+++ b/extras/multipath/devinfo.c
@@ -0,0 +1,204 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <libsysfs.h>
+#include "devinfo.h"
+#include "sg_include.h"
+
+#define FILE_NAME_SIZE 255
+
+void
+basename(char * str1, char * str2)
+{
+ char *p = str1 + (strlen(str1) - 1);
+
+ while (*--p != '/')
+ continue;
+ strcpy(str2, ++p);
+}
+
+static int
+do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
+ void *resp, int mx_resp_len, int noisy)
+{
+ unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
+ { INQUIRY_CMD, 0, 0, 0, 0, 0 };
+ unsigned char sense_b[SENSE_BUFF_LEN];
+ struct sg_io_hdr io_hdr;
+
+ if (cmddt)
+ inqCmdBlk[1] |= 2;
+ if (evpd)
+ inqCmdBlk[1] |= 1;
+ inqCmdBlk[2] = (unsigned char) pg_op;
+ inqCmdBlk[4] = (unsigned char) mx_resp_len;
+ memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+ io_hdr.interface_id = 'S';
+ io_hdr.cmd_len = sizeof (inqCmdBlk);
+ io_hdr.mx_sb_len = sizeof (sense_b);
+ io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
+ io_hdr.dxfer_len = mx_resp_len;
+ io_hdr.dxferp = resp;
+ io_hdr.cmdp = inqCmdBlk;
+ io_hdr.sbp = sense_b;
+ io_hdr.timeout = DEF_TIMEOUT;
+
+ if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
+ perror("SG_IO (inquiry) error");
+ return -1;
+ }
+
+ /* treat SG_ERR here to get rid of sg_err.[ch] */
+ io_hdr.status &= 0x7e;
+ if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
+ (0 == io_hdr.driver_status))
+ return 0;
+ if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
+ (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
+ (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
+ if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
+ int sense_key;
+ unsigned char * sense_buffer = io_hdr.sbp;
+ if (sense_buffer[0] & 0x2)
+ sense_key = sense_buffer[1] & 0xf;
+ else
+ sense_key = sense_buffer[2] & 0xf;
+ if(RECOVERED_ERROR == sense_key)
+ return 0;
+ }
+ }
+ return -1;
+}
+
+int
+get_serial (char * str, char * devname)
+{
+ int fd;
+ int len;
+ char buff[MX_ALLOC_LEN + 1];
+
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+
+ if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
+ len = buff[3];
+ if (len > 0) {
+ memcpy(str, buff + 4, len);
+ buff[len] = '\0';
+ }
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+int
+get_lun_strings(char * vendor_id, char * product_id, char * rev, char * devname)
+{
+ int fd;
+ char buff[36];
+ char attr_path[FILE_NAME_SIZE];
+ char sysfs_path[FILE_NAME_SIZE];
+ char basedev[FILE_NAME_SIZE];
+
+ if (0 == sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ /* sysfs style */
+ basename(devname, basedev);
+
+ sprintf(attr_path, "%s/block/%s/device/vendor",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ vendor_id, 8)) return 0;
+
+ sprintf(attr_path, "%s/block/%s/device/model",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ product_id, 16)) return 0;
+
+ sprintf(attr_path, "%s/block/%s/device/rev",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ rev, 4)) return 0;
+ } else {
+ /* ioctl style */
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+ if (0 != do_inq(fd, 0, 0, 0, buff, 36, 1))
+ return 0;
+ memcpy(vendor_id, &buff[8], 8);
+ memcpy(product_id, &buff[16], 16);
+ memcpy(rev, &buff[32], 4);
+ close(fd);
+ return 1;
+ }
+ return 0;
+}
+
+static void
+sprint_wwid(char * buff, const char * str)
+{
+ int i;
+ const char *p;
+ char *cursor;
+ unsigned char c;
+
+ p = str;
+ cursor = buff;
+ for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
+ c = *p++;
+ sprintf(cursor, "%.2x", (int) (unsigned char) c);
+ cursor += 2;
+ }
+ buff[WWID_SIZE - 1] = '\0';
+}
+
+/* get EVPD page 0x83 off 8 */
+/* tested ok with StorageWorks */
+int
+get_evpd_wwid(char * devname, char * wwid)
+{
+ int fd;
+ char buff[64];
+
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+
+ if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
+ sprint_wwid(wwid, &buff[8]);
+ close(fd);
+ return 1; /* success */
+ }
+ close(fd);
+ return 0; /* not good */
+}
+
+long
+get_disk_size (char * devname) {
+ long size;
+ int fd;
+ char attr_path[FILE_NAME_SIZE];
+ char sysfs_path[FILE_NAME_SIZE];
+ char buff[FILE_NAME_SIZE];
+ char basedev[FILE_NAME_SIZE];
+
+ if (0 == sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ basename(devname, basedev);
+ sprintf(attr_path, "%s/block/%s/size",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path, buff,
+ FILE_NAME_SIZE * sizeof(char)))
+ return -1;
+ size = atoi(buff);
+ return size;
+ } else {
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return -1;
+ if(!ioctl(fd, BLKGETSIZE, &size))
+ return size;
+ }
+ return -1;
+}
+