diff options
Diffstat (limited to 'extras/multipath/devinfo.c')
| -rw-r--r-- | extras/multipath/devinfo.c | 204 |
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; +} + |