1 files changed, 251 insertions, 0 deletions
diff --git a/usr/src/lib/sun_sas/common/devlink_disco.c b/usr/src/lib/sun_sas/common/devlink_disco.c
new file mode 100644
index 0000000000..9b616e2293
--- /dev/null
+++ b/usr/src/lib/sun_sas/common/devlink_disco.c
@@ -0,0 +1,251 @@
+/*
+ * 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));
+}