- Add "-f file" support to listing mode (-l). When a -f option is

  specified, only md(4) devices which have the specified file as backing
  store are displayed.
- Use MD_NAME instead of "md".
- Use _PATH_DEV instead of "/dev/".

MFC after:	1 week

2 files changed, 45 insertions, 25 deletions

diff --git a/sbin/mdconfig/mdconfig.8 b/sbin/mdconfig/mdconfig.8
index c18027c..b3cc110 100644
--- a/sbin/mdconfig/mdconfig.8
+++ b/sbin/mdconfig/mdconfig.8
@@ -41,7 +41,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd November 3, 2012
+.Dd June 20, 2013
 .Dt MDCONFIG 8
 .Os
 .Sh NAME
@@ -72,6 +72,7 @@
 .Fl l
 .Op Fl n
 .Op Fl v
+.Op Fl f Ar file
 .Op Fl u Ar unit
 .Nm
 .Ar file
@@ -131,6 +132,19 @@ List configured devices.
 If given with
 .Fl u ,
 display details about that particular device.
+If given with
+.Fl f Ar file ,
+display
+.Xr md 4
+device names of which
+.Ar file
+is used as the backing store.
+If both of
+.Fl u
+and
+.Fl f
+options are specified,
+display devices which match the two conditions. 
 If the
 .Fl v
 option is specified, show all details.
diff --git a/sbin/mdconfig/mdconfig.c b/sbin/mdconfig/mdconfig.c
index 70cefe9..c04b876 100644
--- a/sbin/mdconfig/mdconfig.c
+++ b/sbin/mdconfig/mdconfig.c
@@ -47,6 +47,7 @@
 #include <inttypes.h>
 #include <libgeom.h>
 #include <libutil.h>
+#include <paths.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -59,9 +60,9 @@ static int nflag;
 
 static void usage(void);
 static void md_set_file(const char *);
-static int md_find(char *, const char *);
-static int md_query(char *name);
-static int md_list(char *units, int opt);
+static int md_find(const char *, const char *);
+static int md_query(const char *, const int, const char *);
+static int md_list(const char *, int, const char *);
 static char *geom_config_get(struct gconf *g, const char *name);
 static void md_prthumanval(char *length);
 
@@ -82,7 +83,7 @@ usage(void)
 "                [-x sectors/track] [-y heads/cylinder]\n"
 "       mdconfig -d -u unit [-o [no]force]\n"
 "       mdconfig -r -u unit -s size [-o [no]force]\n"
-"       mdconfig -l [-v] [-n] [-u unit]\n"
+"       mdconfig -l [-v] [-n] [-f file] [-u unit]\n"
 "       mdconfig file\n");
 	fprintf(stderr, "\t\ttype = {malloc, vnode, swap}\n");
 	fprintf(stderr, "\t\toption = {cluster, compress, reserve}\n");
@@ -215,7 +216,7 @@ main(int argc, char **argv)
 				errx(1, "unknown suffix on -s argument");
 			break;
 		case 'u':
-			if (!strncmp(optarg, "/dev/", 5))
+			if (!strncmp(optarg, _PATH_DEV, 5))
 				optarg += 5;
 			if (!strncmp(optarg, MD_NAME, sizeof(MD_NAME) - 1))
 				optarg += sizeof(MD_NAME) - 1;
@@ -298,8 +299,8 @@ main(int argc, char **argv)
 			errx(1, "-x can only be used with -a");
 		if (mdio.md_fwheads != 0)
 			errx(1, "-y can only be used with -a");
-		if (fflag != NULL)
-			errx(1, "-f can only be used with -a");
+		if (fflag != NULL && action != LIST)
+			errx(1, "-f can only be used with -a and -l");
 		if (tflag != NULL)
 			errx(1, "-t can only be used with -a");
 		if (argc > 0)
@@ -333,14 +334,14 @@ main(int argc, char **argv)
 	if (!kld_isloaded("g_md") && kld_load("geom_md") == -1)
 		err(1, "failed to load geom_md module");
 
-	fd = open("/dev/" MDCTL_NAME, O_RDWR, 0);
+	fd = open(_PATH_DEV MDCTL_NAME, O_RDWR, 0);
 	if (fd < 0)
-		err(1, "open(/dev/%s)", MDCTL_NAME);
+		err(1, "open(%s%s)", _PATH_DEV, MDCTL_NAME);
 
 	if (action == ATTACH) {
 		i = ioctl(fd, MDIOCATTACH, &mdio);
 		if (i < 0)
-			err(1, "ioctl(/dev/%s)", MDCTL_NAME);
+			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
 		if (mdio.md_options & MD_AUTOUNIT)
 			printf("%s%d\n", nflag ? "" : MD_NAME, mdio.md_unit);
 	} else if (action == DETACH) {
@@ -348,22 +349,22 @@ main(int argc, char **argv)
 			errx(1, "-d requires -u");
 		i = ioctl(fd, MDIOCDETACH, &mdio);
 		if (i < 0)
-			err(1, "ioctl(/dev/%s)", MDCTL_NAME);
+			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
 	} else if (action == RESIZE) {
 		if (mdio.md_options & MD_AUTOUNIT)
 			errx(1, "-r requires -u");
 		i = ioctl(fd, MDIOCRESIZE, &mdio);
 		if (i < 0)
-			err(1, "ioctl(/dev/%s)", MDCTL_NAME);
+			err(1, "ioctl(%s%s)", _PATH_DEV, MDCTL_NAME);
 	} else if (action == LIST) {
 		if (mdio.md_options & MD_AUTOUNIT) {
 			/*
 			 * Listing all devices. This is why we pass NULL
 			 * together with OPT_LIST.
 			 */
-			md_list(NULL, OPT_LIST | vflag);
+			md_list(NULL, OPT_LIST | vflag, fflag);
 		} else
-			return (md_query(uflag));
+			return (md_query(uflag, vflag, fflag));
 	} else
 		usage();
 	close(fd);
@@ -397,7 +398,7 @@ md_set_file(const char *fn)
  * between list and query mode.
  */
 static int
-md_list(char *units, int opt)
+md_list(const char *units, int opt, const char *fflag)
 {
 	struct gmesh gm;
 	struct gprovider *pp;
@@ -441,15 +442,20 @@ md_list(char *units, int opt)
 					found = 1;
 			}
 			gc = &pp->lg_config;
-			if (nflag && strncmp(pp->lg_name, "md", 2) == 0)
+			type = geom_config_get(gc, "type");
+			if (strcmp(type, "vnode") == 0) {
+				file = geom_config_get(gc, "file");
+				if (fflag != NULL &&
+				    strcmp(fflag, file) != 0)
+					continue;
+			}
+			if (nflag && strncmp(pp->lg_name, MD_NAME, 2) == 0)
 				printf("%s", pp->lg_name + 2);
 			else
 				printf("%s", pp->lg_name);
 
-			if (opt & OPT_VERBOSE || opt & OPT_UNIT) {
-				type = geom_config_get(gc, "type");
-				if (strcmp(type, "vnode") == 0)
-					file = geom_config_get(gc, "file");
+			if (opt & OPT_VERBOSE ||
+			    ((opt & OPT_UNIT) && fflag == NULL)) {
 				length = geom_config_get(gc, "length");
 				printf("\t%s\t", type);
 				if (length != NULL)
@@ -497,7 +503,7 @@ geom_config_get(struct gconf *g, const char *name)
  * otherwise.
  */
 static int
-md_find(char *list, const char *name)
+md_find(const char *list, const char *name)
 {
 	int ret;
 	char num[16];
@@ -508,7 +514,7 @@ md_find(char *list, const char *name)
 	if (ptr == NULL)
 		return (-1);
 	for (p = ptr; (u = strsep(&p, ",")) != NULL;) {
-		if (strncmp(u, "/dev/", 5) == 0)
+		if (strncmp(u, _PATH_DEV, 5) == 0)
 			u += 5;
 		/* Just in case user specified number instead of full name */
 		snprintf(num, sizeof(num), "md%s", u);
@@ -538,8 +544,8 @@ md_prthumanval(char *length)
 }
 
 static int
-md_query(char *name)
+md_query(const char *name, const int opt, const char *fflag)
 {
 
-	return (md_list(name, OPT_UNIT));
+	return (md_list(name, opt | OPT_UNIT, fflag));
 }