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libvirt/tests/scsihosttest.c
John Ferlan ef48a1b613 scsi_host: Introduce virFindSCSIHostByPCI 
Introduce a new function to parse the provided scsi_host parent address
and unique_id value in order to find the /sys/class/scsi_host directory
which will allow a stable SCSI host address

Add a test to scsihosttest to lookup the host# name by using the PCI address
and unique_id value
2014-07-21 12:55:11 -04:00

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/*
* Copyright (C) 2014 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see
* <http://www.gnu.org/licenses/>.
*
*/
#include <config.h>
#include "testutils.h"
#ifdef __linux__
# include <fcntl.h>
# include <sys/stat.h>
# include "virstring.h"
# include "virutil.h"
# include "virerror.h"
# include "virlog.h"
# define VIR_FROM_THIS VIR_FROM_NONE
VIR_LOG_INIT("tests.scsihosttest");
char *scsihost_class_path;
# define TEST_SCSIHOST_CLASS_PATH scsihost_class_path
/*
* Initialized/create a mock sysfs environment with 4 scsi_host devices
* located on "0000:00:1f.1" and "0000:00:1f.2". Each directory will
* contain 4 unique_id files having the same value.
*
* The environment is:
*
* 4 files:
*
* sys/devices/pci0000:00/0000:00:1f.1/ata1/host0/scsi_host/host0/unique_id
* sys/devices/pci0000:00/0000:00:1f.1/ata2/host1/scsi_host/host1/unique_id
* sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/scsi_host/host0/unique_id
* sys/devices/pci0000:00/0000:00:1f.2/ata2/host1/scsi_host/host1/unique_id
*
* 4 symlinks:
*
* sys/class/scsi_host/host0 -> link to 1f.1 host 0
* sys/class/scsi_host/host1 -> link to 1f.1 host 1
* sys/class/scsi_host/host2 -> link to 1f.2 host 0
* sys/class/scsi_host/host3 -> link to 1f.2 host 1
*
* The unique_id's for host0 and host2 are set to "1"
* The unique_id's for host1 and host3 are set to "2"
*/
static int
create_scsihost(const char *fakesysfsdir, const char *devicepath,
const char *unique_id, const char *hostname)
{
char *unique_id_path = NULL;
char *link_path = NULL;
char *spot;
int ret = -1;
int fd = -1;
if (virAsprintfQuiet(&unique_id_path, "%s/devices/pci0000:00/%s/unique_id",
fakesysfsdir, devicepath) < 0 ||
virAsprintfQuiet(&link_path, "%s/class/scsi_host/%s",
fakesysfsdir, hostname) < 0) {
fprintf(stderr, "Out of memory\n");
goto cleanup;
}
/* Rather than create path & file, temporarily snip off the file to
* create the path
*/
if (!(spot = strstr(unique_id_path, "unique_id"))) {
fprintf(stderr, "Did not find unique_id in path\n");
goto cleanup;
}
spot--;
*spot = '\0';
if (virFileMakePathWithMode(unique_id_path, 0755) < 0) {
fprintf(stderr, "Unable to make path to '%s'\n", unique_id_path);
goto cleanup;
}
*spot = '/';
/* Rather than create path & file, temporarily snip off the file to
* create the path
*/
if (!(spot = strstr(link_path, hostname))) {
fprintf(stderr, "Did not find hostname in path\n");
goto cleanup;
}
spot--;
*spot = '\0';
if (virFileMakePathWithMode(link_path, 0755) < 0) {
fprintf(stderr, "Unable to make path to '%s'\n", link_path);
goto cleanup;
}
*spot = '/';
if ((fd = open(unique_id_path, O_CREAT|O_WRONLY, 0444)) < 0) {
fprintf(stderr, "Unable to create '%s'\n", unique_id_path);
goto cleanup;
}
if (safewrite(fd, unique_id, 1) != 1) {
fprintf(stderr, "Unable to write '%s'\n", unique_id);
goto cleanup;
}
VIR_DEBUG("Created unique_id '%s'", unique_id_path);
/* The link is to the path not the file - so remove the file */
if (!(spot = strstr(unique_id_path, "unique_id"))) {
fprintf(stderr, "Did not find unique_id in path\n");
goto cleanup;
}
spot--;
*spot = '\0';
if (symlink(unique_id_path, link_path) < 0) {
fprintf(stderr, "Unable to create symlink '%s' to '%s'\n",
link_path, unique_id_path);
goto cleanup;
}
VIR_DEBUG("Created symlink '%s'", link_path);
ret = 0;
cleanup:
VIR_FORCE_CLOSE(fd);
VIR_FREE(unique_id_path);
VIR_FREE(link_path);
return ret;
}
static int
init_scsihost_sysfs(const char *fakesysfsdir)
{
int ret = 0;
if (create_scsihost(fakesysfsdir,
"0000:00:1f.1/ata1/host0/scsi_host/host0",
"1", "host0") < 0 ||
create_scsihost(fakesysfsdir,
"0000:00:1f.1/ata2/host1/scsi_host/host1",
"2", "host1") < 0 ||
create_scsihost(fakesysfsdir,
"0000:00:1f.2/ata1/host0/scsi_host/host0",
"1", "host2") < 0 ||
create_scsihost(fakesysfsdir,
"0000:00:1f.2/ata2/host1/scsi_host/host1",
"2", "host3") < 0)
ret = -1;
return ret;
}
/* Test virReadSCSIUniqueId */
static int
testVirReadSCSIUniqueId(const void *data ATTRIBUTE_UNUSED)
{
int hostnum, unique_id;
for (hostnum = 0; hostnum < 4; hostnum++) {
if (virReadSCSIUniqueId(TEST_SCSIHOST_CLASS_PATH,
hostnum, &unique_id) < 0) {
fprintf(stderr, "Failed to read hostnum=%d unique_id\n", hostnum);
return -1;
}
/* host0 and host2 have unique_id == 1
* host1 and host3 have unique_id == 2
*/
if ((hostnum == 0 || hostnum == 2) && unique_id != 1) {
fprintf(stderr, "The unique_id='%d' for hostnum=%d is wrong\n",
unique_id, hostnum);
return -1;
} else if ((hostnum == 1 || hostnum == 3) && unique_id != 2) {
fprintf(stderr, "The unique_id='%d' for hostnum=%d is wrong\n",
unique_id, hostnum);
return -1;
}
}
return 0;
}
/* Test virFindSCSIHostByPCI */
static int
testVirFindSCSIHostByPCI(const void *data ATTRIBUTE_UNUSED)
{
unsigned int unique_id1 = 1;
unsigned int unique_id2 = 2;
const char *pci_addr1 = "0000:00:1f.1";
const char *pci_addr2 = "0000:00:1f.2";
char *path_addr = NULL;
char *ret_host = NULL;
int ret = -1;
if (virAsprintf(&path_addr, "%s/%s", abs_srcdir,
"sysfs/class/scsi_host") < 0)
goto cleanup;
if (!(ret_host = virFindSCSIHostByPCI(TEST_SCSIHOST_CLASS_PATH,
pci_addr1, unique_id1)) ||
STRNEQ(ret_host, "host0"))
goto cleanup;
VIR_FREE(ret_host);
if (!(ret_host = virFindSCSIHostByPCI(TEST_SCSIHOST_CLASS_PATH,
pci_addr1, unique_id2)) ||
STRNEQ(ret_host, "host1"))
goto cleanup;
VIR_FREE(ret_host);
if (!(ret_host = virFindSCSIHostByPCI(TEST_SCSIHOST_CLASS_PATH,
pci_addr2, unique_id1)) ||
STRNEQ(ret_host, "host2"))
goto cleanup;
VIR_FREE(ret_host);
if (!(ret_host = virFindSCSIHostByPCI(TEST_SCSIHOST_CLASS_PATH,
pci_addr2, unique_id2)) ||
STRNEQ(ret_host, "host3"))
goto cleanup;
VIR_FREE(ret_host);
ret = 0;
cleanup:
VIR_FREE(ret_host);
VIR_FREE(path_addr);
return ret;
}
# define FAKESYSFSDIRTEMPLATE abs_builddir "/fakesysfsdir-XXXXXX"
static int
mymain(void)
{
int ret = -1;
char *fakesysfsdir = NULL;
if (VIR_STRDUP_QUIET(fakesysfsdir, FAKESYSFSDIRTEMPLATE) < 0) {
fprintf(stderr, "Out of memory\n");
goto cleanup;
}
if (!mkdtemp(fakesysfsdir)) {
fprintf(stderr, "Cannot create fakesysfsdir");
goto cleanup;
}
setenv("LIBVIRT_FAKE_SYSFS_DIR", fakesysfsdir, 1);
if (init_scsihost_sysfs(fakesysfsdir) < 0) {
fprintf(stderr, "Failed to create fakesysfs='%s'\n", fakesysfsdir);
goto cleanup;
}
if (virAsprintfQuiet(&scsihost_class_path, "%s/class/scsi_host",
fakesysfsdir) < 0) {
fprintf(stderr, "Out of memory\n");
goto cleanup;
}
VIR_DEBUG("Reading from '%s'", scsihost_class_path);
if (virtTestRun("testVirReadSCSIUniqueId",
testVirReadSCSIUniqueId, NULL) < 0) {
ret = -1;
goto cleanup;
}
if (virtTestRun("testVirFindSCSIHostByPCI",
testVirFindSCSIHostByPCI, NULL) < 0) {
ret = -1;
goto cleanup;
}
ret = 0;
cleanup:
if (getenv("LIBVIRT_SKIP_CLEANUP") == NULL)
virFileDeleteTree(fakesysfsdir);
VIR_FREE(fakesysfsdir);
VIR_FREE(scsihost_class_path);
return ret;
}
VIRT_TEST_MAIN(mymain)
#else
int
main(void)
{
return EXIT_AM_SKIP;
}
#endif
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