X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=extras%2Fmultipath%2Fmain.c;h=dfaa6867dda84ed34a56504fa83d1a21ddd74499;hb=e41016d3547ef704c0785ba197d36ef69de51260;hp=f62e0f99547b406155b192b2dc497da64634a1e0;hpb=01ff79f58925dd26a717ae78f201d739053b5477;p=elogind.git

diff --git a/extras/multipath/main.c b/extras/multipath/main.c
index f62e0f995..dfaa6867d 100644
--- a/extras/multipath/main.c
+++ b/extras/multipath/main.c
@@ -25,153 +25,10 @@
 #include <linux/kdev_t.h>
 #include <string.h>
 #include <sys/ioctl.h>
-#include <libsysfs.h>
+#include <sysfs/libsysfs.h>
 #include "libdevmapper/libdevmapper.h"
 #include "main.h"
-
-static int
-do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
-       void *resp, int mx_resp_len, int noisy)
-{
-	unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
-	    { INQUIRY_CMD, 0, 0, 0, 0, 0 };
-	unsigned char sense_b[SENSE_BUFF_LEN];
-	struct sg_io_hdr io_hdr;
-
-	if (cmddt)
-		inqCmdBlk[1] |= 2;
-	if (evpd)
-		inqCmdBlk[1] |= 1;
-	inqCmdBlk[2] = (unsigned char) pg_op;
-	inqCmdBlk[4] = (unsigned char) mx_resp_len;
-	memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
-	io_hdr.interface_id = 'S';
-	io_hdr.cmd_len = sizeof (inqCmdBlk);
-	io_hdr.mx_sb_len = sizeof (sense_b);
-	io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
-	io_hdr.dxfer_len = mx_resp_len;
-	io_hdr.dxferp = resp;
-	io_hdr.cmdp = inqCmdBlk;
-	io_hdr.sbp = sense_b;
-	io_hdr.timeout = DEF_TIMEOUT;
-
-	if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
-		perror("SG_IO (inquiry) error");
-		return -1;
-	}
-
-	/* treat SG_ERR here to get rid of sg_err.[ch] */
-	io_hdr.status &= 0x7e;
-	if ((0 == io_hdr.status) && (0 == io_hdr.host_status) &&
-	    (0 == io_hdr.driver_status))
-		return 0;
-	if ((SCSI_CHECK_CONDITION == io_hdr.status) ||
-	    (SCSI_COMMAND_TERMINATED == io_hdr.status) ||
-	    (SG_ERR_DRIVER_SENSE == (0xf & io_hdr.driver_status))) {
-		if (io_hdr.sbp && (io_hdr.sb_len_wr > 2)) {
-			int sense_key;
-			unsigned char * sense_buffer = io_hdr.sbp;
-			if (sense_buffer[0] & 0x2)
-				sense_key = sense_buffer[1] & 0xf;
-			else
-				sense_key = sense_buffer[2] & 0xf;
-			if(RECOVERED_ERROR == sense_key)
-				return 0;
-		}
-	}
-	return -1;
-}
-
-static void
-sprint_wwid(char * buff, const char * str)
-{
-	int i;
-	const char *p;
-	char *cursor;
-	unsigned char c;
-
-	p = str;
-	cursor = buff;
-	for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
-		c = *p++;
-		sprintf(cursor, "%.2x", (int) (unsigned char) c);
-		cursor += 2;
-	}
-	buff[WWID_SIZE - 1] = '\0';
-}
-
-static void
-basename(char * str1, char * str2)
-{
-	char *p = str1 + (strlen(str1) - 1);
-
-	while (*--p != '/')
-		continue;
-	strcpy(str2, ++p);
-}
-
-static int
-get_lun_strings(struct env * conf, struct path * mypath)
-{
-	int fd;
-	char buff[36];
-	char attr_path[FILE_NAME_SIZE];
-	char basedev[FILE_NAME_SIZE];
-
-	if(conf->with_sysfs) {
-		/* sysfs style */
-		basename(mypath->sg_dev, basedev);
-
-		sprintf(attr_path, "%s/block/%s/device/vendor",
-                        conf->sysfs_path, basedev);
-                if (0 > sysfs_read_attribute_value(attr_path,
-		    mypath->vendor_id, 8)) return 0;
-
-		sprintf(attr_path, "%s/block/%s/device/model",
-                        conf->sysfs_path, basedev);
-                if (0 > sysfs_read_attribute_value(attr_path,
-		    mypath->product_id, 16)) return 0;
-
-		sprintf(attr_path, "%s/block/%s/device/rev",
-                        conf->sysfs_path, basedev);
-                if (0 > sysfs_read_attribute_value(attr_path,
-		    mypath->rev, 4)) return 0;
-	} else {
-		/* ioctl style */
-		if ((fd = open(mypath->sg_dev, O_RDONLY)) < 0)
-			return 0;
-		if (0 != do_inq(fd, 0, 0, 0, buff, 36, 1))
-			return 0;
-		memcpy(mypath->vendor_id, &buff[8], 8);
-		memcpy(mypath->product_id, &buff[16], 16);
-		memcpy(mypath->rev, &buff[32], 4);
-		close(fd);
-		return 1;
-	}
-	return 0;
-}
-
-/* hardware vendor specifics : add support for new models below */
-
-/* this one get EVPD page 0x83 off 8 */
-/* tested ok with StorageWorks */
-static int
-get_evpd_wwid(struct path * mypath)
-{
-	int fd;
-	char buff[64];
-
-	if ((fd = open(mypath->sg_dev, O_RDONLY)) < 0)
-                        return 0;
-
-	if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
-		sprint_wwid(mypath->wwid, &buff[8]);
-		close(fd);
-		return 1; /* success */
-	}
-	close(fd);
-	return 0; /* not good */
-}
+#include "devinfo.h"
 
 /* White list switch */
 static int
@@ -182,13 +39,13 @@ get_unique_id(struct path * mypath)
 		char * vendor;
 		char * product;
 		int iopolicy;
-		int (*getuid) (struct path *);
+		int (*getuid) (char *, char *);
 	} wlist[] = {
-		{"COMPAQ  ", "HSV110 (C)COMPAQ", MULTIBUS, &get_evpd_wwid},
-		{"COMPAQ  ", "MSA1000         ", MULTIBUS, &get_evpd_wwid},
-		{"COMPAQ  ", "MSA1000 VOLUME  ", MULTIBUS, &get_evpd_wwid},
-		{"DEC     ", "HSG80           ", MULTIBUS, &get_evpd_wwid},
-		{"HP      ", "HSV100          ", MULTIBUS, &get_evpd_wwid},
+		{"COMPAQ  ", "HSV110 (C)COMPAQ", GROUP_BY_SERIAL, &get_evpd_wwid},
+		{"COMPAQ  ", "MSA1000         ", GROUP_BY_SERIAL, &get_evpd_wwid},
+		{"COMPAQ  ", "MSA1000 VOLUME  ", GROUP_BY_SERIAL, &get_evpd_wwid},
+		{"DEC     ", "HSG80           ", GROUP_BY_SERIAL, &get_evpd_wwid},
+		{"HP      ", "HSV100          ", GROUP_BY_SERIAL, &get_evpd_wwid},
 		{"HP      ", "A6189A          ", MULTIBUS, &get_evpd_wwid},
 		{"HP      ", "OPEN-           ", MULTIBUS, &get_evpd_wwid},
 		{"DDN     ", "SAN DataDirector", MULTIBUS, &get_evpd_wwid},
@@ -208,7 +65,7 @@ get_unique_id(struct path * mypath)
 		if (strncmp(mypath->vendor_id, wlist[i].vendor, 8) == 0 &&
 		    strncmp(mypath->product_id, wlist[i].product, 16) == 0) {
 			mypath->iopolicy = wlist[i].iopolicy;
-			if (!wlist[i].getuid(mypath))
+			if (!wlist[i].getuid(mypath->sg_dev, mypath->wwid))
 				return 0;
 		}
 	}
@@ -253,7 +110,7 @@ get_all_paths_sysfs(struct env * conf, struct path * all_paths)
 	char path[FILE_NAME_SIZE];
 	struct path curpath;
 
-	/* if called from hotplug, only consider the paths that relate to */
+	/* if called from hotplug, only consider the paths that relate */
 	/* to the device pointed by conf.hotplugdev */
 	memset(empty_buff, 0, WWID_SIZE);
 	memset(refwwid, 0, WWID_SIZE);
@@ -261,11 +118,19 @@ get_all_paths_sysfs(struct env * conf, struct path * all_paths)
 		sprintf(buff, "%s%s/block",
 			conf->sysfs_path, conf->hotplugdev);
 		memset(conf->hotplugdev, 0, FILE_NAME_SIZE);
-		readlink(buff, conf->hotplugdev, FILE_NAME_SIZE);
+
+		/* if called from hotplug but with no block, leave */
+		if (0 > readlink(buff, conf->hotplugdev, FILE_NAME_SIZE))
+			return 0;
+
 		basename(conf->hotplugdev, buff);
 		sprintf(curpath.sg_dev, "/dev/%s", buff);
 
-		get_lun_strings(conf, &curpath);
+		get_lun_strings(curpath.vendor_id,
+				curpath.product_id,
+				curpath.rev,
+				curpath.sg_dev);
+		get_serial(curpath.serial, curpath.sg_dev);
 		if (!get_unique_id(&curpath))
 			return 0;
 		strcpy(refwwid, curpath.wwid);
@@ -297,7 +162,11 @@ get_all_paths_sysfs(struct env * conf, struct path * all_paths)
 		basename(devp->path, buff);
 		sprintf(curpath.sg_dev, "/dev/%s", buff);
 
-		get_lun_strings(conf, &curpath);
+		get_lun_strings(curpath.vendor_id,
+				curpath.product_id,
+				curpath.rev,
+				curpath.sg_dev);
+		get_serial(curpath.serial, curpath.sg_dev);
 		if(!get_unique_id(&curpath)) {
 			memset(&curpath, 0, sizeof(path));
 			continue;
@@ -345,7 +214,11 @@ get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
 		strncat(file_name, buff, FILE_NAME_SIZE);
 		strcpy(all_paths[k].sg_dev, file_name);
 
-		get_lun_strings(conf, &all_paths[k]);
+		get_lun_strings(all_paths[k].vendor_id,
+				all_paths[k].product_id,
+				all_paths[k].rev,
+				all_paths[k].sg_dev);
+		get_serial(all_paths[k].serial, all_paths[k].sg_dev);
 		if (!get_unique_id(&all_paths[k]))
 			continue;
 
@@ -480,32 +353,6 @@ print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
 	}
 }
 
-static long
-get_disk_size (struct env * conf, char * dev) {
-	long size;
-	int fd;
-	char attr_path[FILE_NAME_SIZE];
-	char buff[FILE_NAME_SIZE];
-	char basedev[FILE_NAME_SIZE];
-
-	if(conf->with_sysfs) {
-		basename(dev, basedev);
-		sprintf(attr_path, "%s/block/%s/size",
-			conf->sysfs_path, basedev);
-		if (0 > sysfs_read_attribute_value(attr_path, buff,
-					 FILE_NAME_SIZE * sizeof(char)))
-			return -1;
-		size = atoi(buff);
-		return size;
-	} else {
-		if ((fd = open(dev, O_RDONLY)) < 0)
-			return -1;
-		if(!ioctl(fd, BLKGETSIZE, &size))
-			return size;
-	}
-	return -1;
-}
-
 static int
 coalesce_paths(struct env * conf, struct multipath * mp,
 	       struct path * all_paths)
@@ -524,7 +371,7 @@ coalesce_paths(struct env * conf, struct multipath * mp,
 		if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
 			continue;
 
-		/* 2. mp with this uid already instanciated */
+		/* 2. if mp with this uid already instanciated */
 		for (i = 0; i <= nmp; i++) {
 			if (0 == strcmp(mp[i].wwid, all_paths[k].wwid))
 				already_done = 1;
@@ -541,7 +388,7 @@ coalesce_paths(struct env * conf, struct multipath * mp,
 		PINDEX(nmp,np) = k;
 
 		if (mp[nmp].size == 0)
-			mp[nmp].size = get_disk_size(conf, all_paths[k].dev);
+			mp[nmp].size = get_disk_size(all_paths[k].dev);
 
 		for (i = k + 1; i < conf->max_devs; i++) {
 			if (0 == strcmp(all_paths[k].wwid, all_paths[i].wwid)) {
@@ -554,44 +401,48 @@ coalesce_paths(struct env * conf, struct multipath * mp,
 	return nmp;
 }
 
-static int
-make_dm_node(char * str)
-{
-	int r = 0;
-	char buff[FILE_NAME_SIZE];
-	struct dm_names * names;
-        unsigned next = 0;
-	struct dm_task *dmt;
-
-	if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
-		return 0;
+static void
+group_by_serial(struct multipath * mp, struct path * all_paths, char * str) {
+	int path_count, pg_count = 0;
+	int i, k;
+	int * bitmap;
+	char path_buff[FILE_NAME_SIZE];
+	char pg_buff[FILE_NAME_SIZE];
+	char * path_buff_p = &path_buff[0];
+	char * pg_buff_p = &pg_buff[0];
+
+	/* init the bitmap */
+	bitmap = malloc((mp->npaths + 1) * sizeof(int));
+	memset(bitmap, 0, (mp->npaths + 1) * sizeof(int));
+
+	for (i = 0; i <= mp->npaths; i++) {
+		if (bitmap[i])
+			continue;
 
-	if (!dm_task_run(dmt))
-		goto out;
+		/* here, we really got a new pg */
+		pg_count++;
+		path_count = 1;
+		memset(&path_buff, 0, FILE_NAME_SIZE * sizeof(char));
+		path_buff_p = &path_buff[0];
 
-	if (!(names = dm_task_get_names(dmt)))
-		goto out;
+		path_buff_p += sprintf(path_buff_p, " %s", all_paths[mp->pindex[i]].dev);
+		bitmap[i] = 1;
 
-	if (!names->dev) {
-		r = 1;
-		goto out;
+		for (k = i + 1; k <= mp->npaths; k++) {
+			if (bitmap[k])
+				continue;
+			if (0 == strcmp(all_paths[mp->pindex[i]].serial,
+					all_paths[mp->pindex[k]].serial)) {
+				path_buff_p += sprintf(path_buff_p, " %s", all_paths[mp->pindex[k]].dev);
+				bitmap[k] = 1;
+				path_count++;
+			}
+		}
+		pg_buff_p += sprintf(pg_buff_p, " 1 round-robin %i 0%s",
+				     path_count, path_buff);
 	}
-
-        do {
-		if (0 == strcmp(names->name, str))
-			break;
-                next = names->next;
-                names = (void *) names + next;
-        } while (next);
-
-	sprintf(buff, "/dev/mapper/%s", str);
-	unlink(buff);
-	mknod(buff, 0600 | S_IFBLK, names->dev);
-
-	out:
-	dm_task_destroy(dmt);
-	return r;
-
+	sprintf(str, " %i%s", pg_count, pg_buff);
+	free(bitmap);
 }
 
 static int
@@ -657,11 +508,9 @@ setup_map(struct env * conf, struct path * all_paths,
 	if (np < 1)
 		return 0;
 
-	params_p += sprintf(params_p, "%i", conf->dm_path_test_int);
-
-	if (all_paths[PINDEX(index,0)].iopolicy == MULTIBUS &&
-	    !conf->forcedfailover ) {
-		params_p += sprintf(params_p, " %i %s %i %i",
+	if ((all_paths[PINDEX(index,0)].iopolicy == MULTIBUS &&
+	    conf->iopolicy == -1) || conf->iopolicy == MULTIBUS) {
+		params_p += sprintf(params_p, " 1 %i %s %i %i",
 				    dm_pg_prio, dm_ps_name, np, dm_ps_nr_args);
 		
 		for (i=0; i<=mp[index].npaths; i++) {
@@ -672,8 +521,9 @@ setup_map(struct env * conf, struct path * all_paths,
 		}
 	}
 
-	if (all_paths[PINDEX(index,0)].iopolicy == FAILOVER ||
-	    conf->forcedfailover) {
+	if ((all_paths[PINDEX(index,0)].iopolicy == FAILOVER &&
+	     conf->iopolicy == -1) || conf->iopolicy == FAILOVER) {
+		params_p += sprintf(params_p, " %i", mp[index].npaths + 1);
 		for (i=0; i<=mp[index].npaths; i++) {
 			if (0 != all_paths[PINDEX(index,i)].sg_id.scsi_type)
 				continue;
@@ -686,6 +536,11 @@ setup_map(struct env * conf, struct path * all_paths,
 		}
 	}
 
+	if ((all_paths[PINDEX(index,0)].iopolicy == GROUP_BY_SERIAL &&
+	     conf->iopolicy == -1) || conf->iopolicy == GROUP_BY_SERIAL) {
+		group_by_serial(&mp[index], all_paths, params_p);
+	}
+
 	if (mp[index].size < 0)
 		return 0;
 
@@ -706,7 +561,6 @@ setup_map(struct env * conf, struct path * all_paths,
 	if (op == DM_DEVICE_RELOAD)
 		dm_simplecmd(DM_DEVICE_RESUME, mp[index].wwid);
 
-	make_dm_node(mp[index].wwid);
 	return 1;
 }
 
@@ -747,14 +601,19 @@ static void
 usage(char * progname)
 {
 	fprintf(stderr, VERSION_STRING);
-	fprintf(stderr, "Usage: %s [-v|-q] [-d] [-i int] [-m max_devs]\n",
+	fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]",
 		progname);
+	fprintf(stderr,	"[-p failover|multibus|group_by_serial] [device]\n");
+	fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
+	fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
 	fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\n");
-	fprintf(stderr, "\t-f\t\tforce maps to failover mode (1 path/pg)\n");
-	fprintf(stderr, "\t-i\t\tmultipath target param : polling interval\n");
 	fprintf(stderr, "\t-m max_devs\tscan {max_devs} devices at most\n");
-	fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
-	fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
+	fprintf(stderr, "\t-p policy\tforce maps to specified policy :\n");
+	fprintf(stderr, "\t   failover\t\t- 1 path per priority group\n");
+	fprintf(stderr, "\t   multibus\t\t- all paths in 1 priority group\n");
+	fprintf(stderr, "\t   group_by_serial\t- 1 priority group per serial\n");
+	fprintf(stderr, "\tdevice\t\tlimit scope to the device's multipath\n");
+	fprintf(stderr, "\t\t\t(hotplug-style $DEVPATH reference)\n");
 	exit(1);
 }
 
@@ -772,12 +631,7 @@ main(int argc, char *argv[])
 	conf.dry_run = 0;	/* 1 == Do not Create/Update devmaps */
 	conf.verbose = 0;	/* 1 == Print all_paths and mp */
 	conf.quiet = 0;		/* 1 == Do not even print devmaps */
-	conf.with_sysfs = 0;	/* Default to compat / suboptimal behaviour */
-	conf.dm_path_test_int = 10;
-
-	/* kindly provided by libsysfs */
-	if (0 == sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE))
-		conf.with_sysfs = 1;
+	conf.iopolicy = -1;	/* Apply the defaults in get_unique_id() */
 
 	for (i = 1; i < argc; ++i) {
 		if (0 == strcmp("-v", argv[i])) {
@@ -794,20 +648,19 @@ main(int argc, char *argv[])
 			conf.quiet = 1;
 		} else if (0 == strcmp("-d", argv[i]))
 			conf.dry_run = 1;
-		else if (0 == strcmp("-f", argv[i]))
-			conf.forcedfailover = 1;
-		else if (0 == strcmp("-i", argv[i]))
-			conf.dm_path_test_int = atoi(argv[++i]);
-		else if (0 == strcmp("scsi", argv[i]))
-			strcpy(conf.hotplugdev, argv[++i]);
-		else if (*argv[i] == '-') {
+		else if (0 == strcmp("-p", argv[i])) {
+			i++;
+			if (!strcmp(argv[i], "failover"))
+				conf.iopolicy = FAILOVER;
+			if (!strcmp(argv[i], "multibus"))
+				conf.iopolicy = MULTIBUS;
+			if (!strcmp(argv[i], "group_by_serial"))
+				conf.iopolicy = GROUP_BY_SERIAL;
+		} else if (*argv[i] == '-') {
 			fprintf(stderr, "Unknown switch: %s\n", argv[i]);
 			usage(argv[0]);
-		} else if (*argv[i] != '-') {
-			fprintf(stderr, "Unknown argument\n");
-			usage(argv[0]);
-		}
-
+		} else
+			strncpy(conf.hotplugdev, argv[i], FILE_NAME_SIZE);
 	}
 
 	/* dynamic allocations */
@@ -817,7 +670,7 @@ main(int argc, char *argv[])
 	if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL)
 		exit(1);
 
-	if (!conf.with_sysfs) {
+	if (sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE)) {
 		get_all_scsi_ids(&conf, all_scsi_ids);
 		get_all_paths_nosysfs(&conf, all_paths, all_scsi_ids);
 	} else {