1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <sun_sas.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <unistd.h>
32 #include <dirent.h>
33 #include <libdevinfo.h>
34
35 /*
36 * structure for di_devlink_walk
37 */
38 typedef struct walk_devlink {
39 char *path;
40 size_t len;
41 char **linkpp;
42 } walk_devlink_t;
43
44 /*
45 * callback funtion for di_devlink_walk
46 * Find matching /dev link for the given path argument.
47 * devlink element and callback function argument.
48 * The input path is expected to not have "/devices".
49 */
50 static int
get_devlink(di_devlink_t devlink,void * arg)51 get_devlink(di_devlink_t devlink, void *arg)
52 {
53 const char ROUTINE[] = "get_devlink";
54 walk_devlink_t *warg = (walk_devlink_t *)arg;
55
56 /*
57 * When path is specified, it doesn't have minor
58 * name. Therefore, the ../.. prefixes needs to be stripped.
59 */
60 if (warg->path) {
61 char *content = (char *)di_devlink_content(devlink);
62 char *start = strstr(content, "/devices");
63
64 if (start == NULL ||
65 strncmp(start, warg->path, warg->len) != 0 ||
66 /* make it sure the device path has minor name */
67 start[warg->len] != ':') {
68 return (DI_WALK_CONTINUE);
69 }
70 }
71
72 *(warg->linkpp) = strdup(di_devlink_path(devlink));
73 log(LOG_DEBUG, ROUTINE, "Walk terminate");
74 return (DI_WALK_TERMINATE);
75 }
76
77 /*
78 * Convert /devices paths to /dev sym-link paths.
79 * The mapping buffer OSDeviceName paths will be
80 * converted to short names.
81 * mappings The target mappings data to convert to short names
82 *
83 * If no link is found, the long path is left as is.
84 * Note: The NumberOfEntries field MUST not be greater than the size
85 * of the array passed in.
86 */
87 void
convertDevpathToDevlink(PSMHBA_TARGETMAPPING mappings)88 convertDevpathToDevlink(PSMHBA_TARGETMAPPING mappings)
89 {
90 const char ROUTINE[] = "convertDevpathToLink";
91 di_devlink_handle_t hdl;
92 walk_devlink_t warg;
93 int j;
94 char *minor_path, *devlinkp;
95
96 if ((hdl = di_devlink_init(NULL, 0)) == NULL) {
97 log(LOG_DEBUG, ROUTINE, "di_devlink failed: errno:%d",
98 strerror(errno));
99 return;
100 }
101
102 for (j = 0; j < mappings->NumberOfEntries; j++) {
103 if (strchr(mappings->entry[j].ScsiId.OSDeviceName, ':')) {
104 /* search link for minor node */
105 minor_path = mappings->entry[j].ScsiId.OSDeviceName;
106 if (strstr(minor_path, "/devices") != NULL) {
107 minor_path = mappings->entry[j].ScsiId.
108 OSDeviceName + strlen("/devices");
109 }
110 warg.path = NULL;
111 } else {
112 minor_path = NULL;
113 if (strstr(mappings->entry[j].ScsiId.OSDeviceName,
114 "/devices") != NULL) {
115 warg.len = strlen(mappings->entry[j].ScsiId.
116 OSDeviceName) - strlen("/devices");
117 warg.path = mappings->entry[j].
118 ScsiId.OSDeviceName + strlen("/devices");
119 } else {
120 warg.len = strlen(mappings->entry[j].ScsiId.
121 OSDeviceName);
122 warg.path = mappings->entry[j].ScsiId.
123 OSDeviceName;
124 }
125 }
126
127 devlinkp = NULL;
128 warg.linkpp = &devlinkp;
129 (void) di_devlink_walk(hdl, NULL, minor_path, DI_PRIMARY_LINK,
130 (void *)&warg, get_devlink);
131
132 if (devlinkp != NULL) {
133 (void) snprintf(mappings->entry[j].ScsiId.OSDeviceName,
134 sizeof (mappings->entry[j].ScsiId.OSDeviceName),
135 "%s", devlinkp);
136 free(devlinkp);
137 }
138
139 }
140
141 (void) di_devlink_fini(&hdl);
142 }
143
144 /*
145 * Finds controller path for a give device path.
146 *
147 * Return value: /dev link for dir and minor name.
148 */
149 static HBA_STATUS
lookupLink(char * path,char * link,const char * dir,const char * mname)150 lookupLink(char *path, char *link, const char *dir, const char *mname)
151 {
152 const char ROUTINE[] = "lookupLink";
153 DIR *dp;
154 char buf[MAXPATHLEN];
155 char node[MAXPATHLEN];
156 char *charptr;
157 struct dirent *newdirp, *dirp;
158 ssize_t count;
159 int dirplen;
160 char *subpath;
161 char tmpPath[MAXPATHLEN];
162
163 if ((dp = opendir(dir)) == NULL) {
164 log(LOG_DEBUG, ROUTINE,
165 "Unable to open %s to find controller number.", dir);
166 return (HBA_STATUS_ERROR);
167 }
168
169 if (link == NULL) {
170 log(LOG_DEBUG, ROUTINE,
171 "Invalid argument for storing the link.");
172 return (HBA_STATUS_ERROR);
173 }
174
175 /*
176 * dirplen is large enough to fit the largest path-
177 * struct dirent includes one byte (the terminator)
178 * so we don't add 1 to the calculation here.
179 */
180 dirplen = pathconf(dir, _PC_NAME_MAX);
181 dirplen = ((dirplen <= 0) ? MAXNAMELEN : dirplen) +
182 sizeof (struct dirent);
183 dirp = (struct dirent *)malloc(dirplen);
184 if (dirp == NULL) {
185 OUT_OF_MEMORY(ROUTINE);
186 return (HBA_STATUS_ERROR);
187 }
188
189 while ((readdir_r(dp, dirp, &newdirp)) == 0 && newdirp != NULL) {
190 if (strcmp(dirp->d_name, ".") == 0 ||
191 strcmp(dirp->d_name, "..") == 0) {
192 continue;
193 }
194 /*
195 * set to another pointer since dirp->d_name length is 1
196 * that will store only the first char 'c' from the name.
197 */
198 charptr = dirp->d_name;
199 (void) snprintf(node, strlen(charptr) + strlen(dir) + 2,
200 "%s/%s", dir, charptr);
201 if (count = readlink(node, buf, sizeof (buf))) {
202 subpath = NULL;
203 subpath = strstr(buf, path);
204 buf[count] = '\0';
205 if (subpath != NULL) {
206 (void) strlcpy(tmpPath, path, MAXPATHLEN);
207 (void) strlcat(tmpPath, mname, MAXPATHLEN);
208 /*
209 * if device path has substring of path
210 * and exactally matching with :scsi suffix
211 */
212 if (strcmp(subpath, tmpPath) == 0) {
213 (void) strlcpy(link, node, MAXPATHLEN);
214 (void) closedir(dp);
215 S_FREE(dirp);
216 return (HBA_STATUS_OK);
217 }
218 }
219 }
220 }
221
222 (void) closedir(dp);
223 S_FREE(dirp);
224 return (HBA_STATUS_ERROR);
225 }
226
227 /*
228 * Finds controller path for a give device path.
229 *
230 * Return vale:i smp devlink.
231 */
232 HBA_STATUS
lookupControllerLink(char * path,char * link)233 lookupControllerLink(char *path, char *link)
234 {
235 const char dir[] = "/dev/cfg";
236 const char mname[] = ":scsi";
237 return (lookupLink(path, link, dir, mname));
238 }
239
240 /*
241 * Finds smp devlink for a give smp path.
242 *
243 * Return vale: smp devlink.
244 */
245 HBA_STATUS
lookupSMPLink(char * path,char * link)246 lookupSMPLink(char *path, char *link)
247 {
248 const char dir[] = "/dev/smp";
249 const char mname[] = ":smp";
250 return (lookupLink(path, link, dir, mname));
251 }
252