+2003-12-20 multipath-010
+ * big ChangeLog update
+ * start to give a little control over target params :
+ introduce cmdline arg -i to control polling interval
+ * cope with hotplug-style calling convention :
+ ie "multipath scsi $DEVPATH" ... to avoid messing with
+ online maps not concerned by an event
+ * example hotplug agent to drop in /etc/hotplug.d/scsi
+ * revert the run & resched patch : unless someone proves me
+ wrong, this was overdesigned
+ * move commented out functions in unused.c
+ * update multipath target params to "udm[23] style"
+ * mp target now supports nr_path == 1, so do we
+ * add gratuitous free()
+ * push version forward
+2003-12-15 multipath-009
+ * Make the HW-specific get_unique_id switch pretty
+ * Prepare to field-test by whitelisting all known fibre array,
+ try to fetch WWID from the standard EVPD 0x83 off 8 for everyone
+ * configure the multipath target with round-robin path selector and
+ conservative default for a start (udm1 style) :
+ yes it makes this release the firstreally useful one.
+ * temporarily disable map creation for single path device
+ due to current restrictive defaults in the kernel target.
+ Sistina should work it out.
+ * correct the strncmp logic in blacklist function.
+ * update the Makefiles to autodetect libgcc.a & gcc includes
+ "ulibc-style". Factorisation of udevdirs & others niceties
+ * drop a hint about absent /dev/sd? on failed open()
+ * implement a reschedule flag in /var/run.
+ Last thing the prog do before exit is check if a call to multipath
+ was done (but canceled by /var/run/multipath.run check) during its
+ execution. If so restart themain loop.
+ * implement a blacklist of sysfs bdev to not bother with for now
+ (hd,md, dm, sr, scd, ram, raw).
+ This avoid sending SG_IO to unappropiate devices.
+ * Adds a /var/run/multipath.run handling to avoid simultaneous runs.
+ * Remove a commented-out "printf"
+ * drop a libdevmapper copy in extras/multipath;
+ maybe discussions w/Sistina folks will bring a better solution in the future.
+ * drop a putchar usage in libdevmapper to compile cleanly with klibc
+ * drop another such usage of my own in main.c
+ * massage the Makefile to compile libdevmapper against klibc
+ * use "ld" to produce the binary rather than "gcc -static"
+ * stop being stupid w/ uneeded major, minor & dev in main.c:dm_mk_node()
+ * reverse to creating striped target for now because the multipath target
+ is more hairy than expected initialy
+ * push the version code to 009 to be in synch w/ udev
+2003-11-27 multipath-007
+ * removes sg_err.[ch] deps
+ * makes sure the core code play nice with klibc
+ * port the sysfs calls to dlist helpers
+ * links against udev's sysfs (need libsysfs.a & dlist.a)
+ * finally define DM_TARGET as "multipath" as Joe posted the code today (not tested yet)
+ * push version forward (do you want it in sync with udev version?)
+2003-11-19
+ * merged in udev-006 tree
2003-09-18 Christophe Varoqui <christophe.varoqui@free.fr>
* multipath 0.0.1 released.
* Initial release.
/*
- * Soft: Description here...
+ * Soft: multipath device mapper target autoconfig
*
* Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
*
struct sysfs_directory * sdir;
struct sysfs_directory * devp;
struct sysfs_link * linkp;
+ char refwwid[WWID_SIZE];
+ char empty_buff[WWID_SIZE];
char buff[FILE_NAME_SIZE];
+ char path[FILE_NAME_SIZE];
+ struct path curpath;
- char block_path[FILE_NAME_SIZE];
+ /* if called from udev, only consider the paths that relate to */
+ /* to the device pointed by conf.hotplugdev */
+ memset(empty_buff, 0, WWID_SIZE);
+ memset(refwwid, 0, WWID_SIZE);
+ if (strncmp("/devices", conf->hotplugdev, 8) == 0) {
+ sprintf(buff, "%s%s/block",
+ conf->sysfs_path, conf->hotplugdev);
+ memset(conf->hotplugdev, 0, FILE_NAME_SIZE);
+ readlink(buff, conf->hotplugdev, FILE_NAME_SIZE);
+ basename(conf->hotplugdev, buff);
+ sprintf(curpath.sg_dev, "/dev/%s", buff);
+
+ if ((sg_fd = open(curpath.sg_dev, O_RDONLY)) < 0)
+ exit(1);
+
+ get_lun_strings(sg_fd, &curpath);
+ get_unique_id(sg_fd, &curpath);
+ strcpy(refwwid, curpath.wwid);
+ memset(&curpath, 0, sizeof(path));
+ }
- sprintf(block_path, "%s/block", conf->sysfs_path);
- sdir = sysfs_open_directory(block_path);
+ sprintf(path, "%s/block", conf->sysfs_path);
+ sdir = sysfs_open_directory(path);
sysfs_read_directory(sdir);
+
dlist_for_each_data(sdir->subdirs, devp, struct sysfs_directory) {
if (blacklist(devp->name))
continue;
+
sysfs_read_directory(devp);
+
if(devp->links == NULL)
continue;
+
dlist_for_each_data(devp->links, linkp, struct sysfs_link) {
if (!strncmp(linkp->name, "device", 6))
break;
}
+
if (linkp == NULL) {
continue;
}
basename(devp->path, buff);
- sprintf(all_paths[k].sg_dev, "/dev/%s", buff);
- strcpy(all_paths[k].dev, all_paths[k].sg_dev);
- if ((sg_fd = open(all_paths[k].sg_dev, O_RDONLY)) < 0) {
+ sprintf(curpath.sg_dev, "/dev/%s", buff);
+
+ if ((sg_fd = open(curpath.sg_dev, O_RDONLY)) < 0) {
if (conf->verbose)
- fprintf(stderr, "can't open %s. mknod ?",
- all_paths[k].sg_dev);
+ fprintf(stderr, "can't open %s\n",
+ curpath.sg_dev);
continue;
}
- get_lun_strings(sg_fd, &all_paths[k]);
- get_unique_id(sg_fd, &all_paths[k]);
+
+ get_lun_strings(sg_fd, &curpath);
+ get_unique_id(sg_fd, &curpath);
+
+ if (memcmp(empty_buff, refwwid, WWID_SIZE) != 0 &&
+ strncmp(curpath.wwid, refwwid, WWID_SIZE) != 0) {
+ memset(&curpath, 0, sizeof(path));
+ continue;
+ }
+
+ strcpy(all_paths[k].sg_dev, curpath.sg_dev);
+ strcpy(all_paths[k].dev, curpath.sg_dev);
+ strcpy(all_paths[k].wwid, curpath.wwid);
+ strcpy(all_paths[k].vendor_id, curpath.vendor_id);
+ strcpy(all_paths[k].product_id, curpath.product_id);
+ memset(&curpath, 0, sizeof(path));
all_paths[k].state = do_tur(sg_fd);
close(sg_fd);
basename(linkp->target, buff);
k++;
}
sysfs_close_directory(sdir);
-
return 0;
}
}
-/* future use ?
-static int
-del_map(char * str) {
- struct dm_task *dmt;
-
- if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
- return 0;
- if (!dm_task_set_name(dmt, str))
- goto delout;
- if (!dm_task_run(dmt))
- goto delout;
-
- printf("Deleted device map : %s\n", str);
-
- delout:
- dm_task_destroy(dmt);
- return 1;
-}
-*/
-
static int
add_map(struct env * conf, struct path * all_paths,
struct multipath * mp, int index, int op)
long size = -1;
/* defaults for multipath target */
- int dm_nr_path_args = 2;
- int dm_path_test_int = 10;
+ int dm_pg_prio = 1;
char * dm_ps_name = "round-robin";
- int dm_ps_nr_args = 2;
- int dm_path_failback_int = 10;
- int dm_path_nr_fail = 2;
- int dm_ps_prio = 1;
- int dm_ps_min_io = 2;
-
+ int dm_ps_nr_args = 0;
if (!(dmt = dm_task_create(op)))
return 0;
}
if (np == 0)
goto addout;
- /* temporarily disable creation of single path maps */
- /* Sistina should modify the target limits */
- if (np < 2)
+
+ if (np < 1)
goto addout;
- params_p += sprintf(params_p, "%i %i %i %s %i",
- np, dm_nr_path_args, dm_path_test_int,
- dm_ps_name, dm_ps_nr_args);
+ params_p += sprintf(params_p, "%i %i %s %i %i",
+ conf->dm_path_test_int, dm_pg_prio,
+ dm_ps_name, np, dm_ps_nr_args);
for (i=0; i<=mp[index].npaths; i++) {
if (( 0 == all_paths[PINDEX(index,i)].state) ||
continue;
if (size < 0)
size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
- params_p += sprintf(params_p, " %s %i %i %i %i",
- all_paths[PINDEX(index,i)].dev,
- dm_path_failback_int, dm_path_nr_fail,
- dm_ps_prio, dm_ps_min_io);
+ params_p += sprintf(params_p, " %s",
+ all_paths[PINDEX(index,i)].dev);
}
if (size < 0)
return 1;
}
-/*
-static int
-get_table(const char * str)
-{
- int r = 0;
- struct dm_task *dmt;
- void *next = NULL;
- uint64_t start, length;
- char *target_type = NULL;
- char *params;
-
- if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
- return 0;
-
- if (!dm_task_set_name(dmt, str))
- goto out;
-
- if (!dm_task_run(dmt))
- goto out;
-
- do {
- next = dm_get_next_target(dmt, next, &start, &length,
- &target_type, ¶ms);
- if (target_type) {
- printf("%" PRIu64 " %" PRIu64 " %s %s\n",
- start, length, target_type, params);
- }
- } while (next);
-
- r = 1;
-
- out:
- dm_task_destroy(dmt);
- return r;
-
-}
-*/
-
static int
map_present(char * str)
{
usage(char * progname)
{
fprintf(stderr, VERSION_STRING);
- fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]\n", progname);
- 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, "Usage: %s [-v|-q] [-d] [-i int] [-m max_devs]\n", progname);
fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\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");
exit(1);
}
-static int
-filepresent(char * run) {
- struct stat buf;
-
- if(!stat(run, &buf))
- return 1;
- return 0;
-}
-
int
main(int argc, char *argv[])
{
- char * run = "/var/run/multipath.run";
- char * resched = "/var/run/multipath.reschedule";
struct multipath * mp;
struct path * all_paths;
struct scsi_dev * all_scsi_ids;
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.quiet = 1;
} else if (0 == strcmp("-d", argv[i]))
conf.dry_run = 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] == '-') {
fprintf(stderr, "Unknown switch: %s\n", argv[i]);
usage(argv[0]);
}
- if (filepresent(run)) {
- if (conf.verbose) {
- fprintf(stderr, "Already running.\n");
- fprintf(stderr, "If you know what you do, please ");
- fprintf(stderr, "remove %s\n", run);
- }
- /* leave a trace that we were called while already running */
- open(resched, O_CREAT);
- return 1;
- }
-
/* dynamic allocations */
mp = malloc(conf.max_devs * sizeof(struct multipath));
all_paths = malloc(conf.max_devs * sizeof(struct path));
all_scsi_ids = malloc(conf.max_devs * sizeof(struct scsi_dev));
- if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL) {
- unlink(run);
- exit(1);
- }
-start:
- if(!open(run, O_CREAT))
+ if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL)
exit(1);
if (!conf.with_sysfs) {
fprintf(stdout, "\n");
}
- if (conf.dry_run) {
- unlink(run);
+ if (conf.dry_run)
exit(0);
- }
for (k=0; k<=nmp; k++) {
if (map_present(mp[k].wwid)) {
add_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);
}
}
- unlink(run);
- /* start again if we were ask to during this process run */
- /* ie. do not loose an event-asked run */
- if (filepresent(resched)) {
- unlink(resched);
- goto start;
- }
+ /* free allocs */
+ free(mp);
+ free(all_paths);
+ free(all_scsi_ids);
+
exit(0);
}
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