OpenSolaris_b135/lib/sun_sas/common/devlink_disco.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sun_sas.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <libdevinfo.h>
/*
* structure for di_devlink_walk
*/
typedef struct walk_devlink {
char *path;
size_t len;
char **linkpp;
} walk_devlink_t;
/*
* callback funtion for di_devlink_walk
* Find matching /dev link for the given path argument.
* devlink element and callback function argument.
* The input path is expected to not have "/devices".
*/
static int
get_devlink(di_devlink_t devlink, void *arg)
{
const char ROUTINE[] = "get_devlink";
walk_devlink_t *warg = (walk_devlink_t *)arg;
/*
* When path is specified, it doesn't have minor
* name. Therefore, the ../.. prefixes needs to be stripped.
*/
if (warg->path) {
char *content = (char *)di_devlink_content(devlink);
char *start = strstr(content, "/devices");
if (start == NULL ||
strncmp(start, warg->path, warg->len) != 0 ||
/* make it sure the device path has minor name */
start[warg->len] != ':') {
return (DI_WALK_CONTINUE);
}
}
*(warg->linkpp) = strdup(di_devlink_path(devlink));
log(LOG_DEBUG, ROUTINE, "Walk terminate");
return (DI_WALK_TERMINATE);
}
/*
* Convert /devices paths to /dev sym-link paths.
* The mapping buffer OSDeviceName paths will be
* converted to short names.
* mappings The target mappings data to convert to short names
*
* If no link is found, the long path is left as is.
* Note: The NumberOfEntries field MUST not be greater than the size
* of the array passed in.
*/
void
convertDevpathToDevlink(PSMHBA_TARGETMAPPING mappings)
{
const char ROUTINE[] = "convertDevpathToLink";
di_devlink_handle_t hdl;
walk_devlink_t warg;
int j;
char *minor_path, *devlinkp;
if ((hdl = di_devlink_init(NULL, 0)) == NULL) {
log(LOG_DEBUG, ROUTINE, "di_devlink failed: errno:%d",
strerror(errno));
return;
}
for (j = 0; j < mappings->NumberOfEntries; j++) {
if (strchr(mappings->entry[j].ScsiId.OSDeviceName, ':')) {
/* search link for minor node */
minor_path = mappings->entry[j].ScsiId.OSDeviceName;
if (strstr(minor_path, "/devices") != NULL) {
minor_path = mappings->entry[j].ScsiId.
OSDeviceName + strlen("/devices");
}
warg.path = NULL;
} else {
minor_path = NULL;
if (strstr(mappings->entry[j].ScsiId.OSDeviceName,
"/devices") != NULL) {
warg.len = strlen(mappings->entry[j].ScsiId.
OSDeviceName) - strlen("/devices");
warg.path = mappings->entry[j].
ScsiId.OSDeviceName + strlen("/devices");
} else {
warg.len = strlen(mappings->entry[j].ScsiId.
OSDeviceName);
warg.path = mappings->entry[j].ScsiId.
OSDeviceName;
}
}
devlinkp = NULL;
warg.linkpp = &devlinkp;
(void) di_devlink_walk(hdl, NULL, minor_path, DI_PRIMARY_LINK,
(void *)&warg, get_devlink);
if (devlinkp != NULL) {
(void) snprintf(mappings->entry[j].ScsiId.OSDeviceName,
sizeof (mappings->entry[j].ScsiId.OSDeviceName),
"%s", devlinkp);
free(devlinkp);
}
}
(void) di_devlink_fini(&hdl);
}
/*
* Finds controller path for a give device path.
*
* Return value: /dev link for dir and minor name.
*/
static HBA_STATUS
lookupLink(char *path, char *link, const char *dir, const char *mname)
{
const char ROUTINE[] = "lookupLink";
DIR *dp;
char buf[MAXPATHLEN];
char node[MAXPATHLEN];
char *charptr;
struct dirent *newdirp, *dirp;
ssize_t count;
int dirplen;
char *subpath;
char tmpPath[MAXPATHLEN];
if ((dp = opendir(dir)) == NULL) {
log(LOG_DEBUG, ROUTINE,
"Unable to open %s to find controller number.", dir);
return (HBA_STATUS_ERROR);
}
if (link == NULL) {
log(LOG_DEBUG, ROUTINE,
"Invalid argument for storing the link.");
return (HBA_STATUS_ERROR);
}
/*
* dirplen is large enough to fit the largest path-
* struct dirent includes one byte (the terminator)
* so we don't add 1 to the calculation here.
*/
dirplen = pathconf(dir, _PC_NAME_MAX);
dirplen = ((dirplen <= 0) ? MAXNAMELEN : dirplen) +
sizeof (struct dirent);
dirp = (struct dirent *)malloc(dirplen);
if (dirp == NULL) {
OUT_OF_MEMORY(ROUTINE);
return (HBA_STATUS_ERROR);
}
while ((readdir_r(dp, dirp, &newdirp)) == 0 && newdirp != NULL) {
if (strcmp(dirp->d_name, ".") == 0 ||
strcmp(dirp->d_name, "..") == 0) {
continue;
}
/*
* set to another pointer since dirp->d_name length is 1
* that will store only the first char 'c' from the name.
*/
charptr = dirp->d_name;
(void) snprintf(node, strlen(charptr) + strlen(dir) + 2,
"%s/%s", dir, charptr);
if (count = readlink(node, buf, sizeof (buf))) {
subpath = NULL;
subpath = strstr(buf, path);
buf[count] = '\0';
if (subpath != NULL) {
(void) strlcpy(tmpPath, path, MAXPATHLEN);
(void) strlcat(tmpPath, mname, MAXPATHLEN);
/*
* if device path has substring of path
* and exactally matching with :scsi suffix
*/
if (strcmp(subpath, tmpPath) == 0) {
(void) strlcpy(link, node, MAXPATHLEN);
(void) closedir(dp);
S_FREE(dirp);
return (HBA_STATUS_OK);
}
}
}
}
(void) closedir(dp);
S_FREE(dirp);
return (HBA_STATUS_ERROR);
}
/*
* Finds controller path for a give device path.
*
* Return vale:i smp devlink.
*/
HBA_STATUS
lookupControllerLink(char *path, char *link)
{
const char dir[] = "/dev/cfg";
const char mname[] = ":scsi";
return (lookupLink(path, link, dir, mname));
}
/*
* Finds smp devlink for a give smp path.
*
* Return vale: smp devlink.
*/
HBA_STATUS
lookupSMPLink(char *path, char *link)
{
const char dir[] = "/dev/smp";
const char mname[] = ":smp";
return (lookupLink(path, link, dir, mname));
}