From 176857119a77aad650412d9fedb568da4b543e07 Mon Sep 17 00:00:00 2001 From: "christophe.varoqui@free.fr" Date: Mon, 22 Dec 2003 20:49:22 -0800 Subject: [PATCH] [PATCH] extras multipath update An important one, against stock udev-009 : 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 --- extras/multipath/ChangeLog | 57 ++++++++ extras/multipath/main.c | 207 +++++++++++------------------ extras/multipath/main.h | 6 +- extras/multipath/multipath.hotplug | 3 + extras/multipath/unsused.c | 52 ++++++++ 5 files changed, 194 insertions(+), 131 deletions(-) create mode 100644 extras/multipath/multipath.hotplug create mode 100644 extras/multipath/unsused.c diff --git a/extras/multipath/ChangeLog b/extras/multipath/ChangeLog index f3014cf0..f31fbf41 100644 --- a/extras/multipath/ChangeLog +++ b/extras/multipath/ChangeLog @@ -1,3 +1,60 @@ +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 * multipath 0.0.1 released. * Initial release. diff --git a/extras/multipath/main.c b/extras/multipath/main.c index 9402888c..39b4a9fa 100644 --- a/extras/multipath/main.c +++ b/extras/multipath/main.c @@ -1,5 +1,5 @@ /* - * 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 $ * @@ -258,38 +258,80 @@ get_all_paths_sysfs(struct env * conf, struct path * all_paths) 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); @@ -301,7 +343,6 @@ get_all_paths_sysfs(struct env * conf, struct path * all_paths) k++; } sysfs_close_directory(sdir); - return 0; } @@ -562,26 +603,6 @@ make_dm_node(char * str) } -/* 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) @@ -593,15 +614,9 @@ add_map(struct env * conf, struct path * all_paths, 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; @@ -618,14 +633,13 @@ add_map(struct env * conf, struct path * all_paths, } 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) || @@ -633,10 +647,8 @@ add_map(struct env * conf, struct path * all_paths, 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) @@ -665,44 +677,6 @@ add_map(struct env * conf, struct path * all_paths, 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) { @@ -740,28 +714,18 @@ static void 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; @@ -774,6 +738,7 @@ main(int argc, char *argv[]) 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)) @@ -794,6 +759,10 @@ main(int argc, char *argv[]) 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]); @@ -804,27 +773,11 @@ main(int argc, char *argv[]) } - 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) { @@ -842,10 +795,8 @@ start: 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)) { @@ -854,13 +805,11 @@ start: 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); } diff --git a/extras/multipath/main.h b/extras/multipath/main.h index d6dfb142..0c5620ff 100644 --- a/extras/multipath/main.h +++ b/extras/multipath/main.h @@ -99,14 +99,16 @@ struct env { int quiet; int dry_run; int with_sysfs; + int dm_path_test_int; char sysfs_path[FILE_NAME_SIZE]; + char hotplugdev[FILE_NAME_SIZE]; }; /* Build version */ #define PROG "multipath" -#define VERSION_CODE 0x000009 -#define DATE_CODE 0x0C0503 +#define VERSION_CODE 0x000010 +#define DATE_CODE 0x0C1503 #define MULTIPATH_VERSION(version) \ (version >> 16) & 0xFF, \ diff --git a/extras/multipath/multipath.hotplug b/extras/multipath/multipath.hotplug new file mode 100644 index 00000000..db7894cb --- /dev/null +++ b/extras/multipath/multipath.hotplug @@ -0,0 +1,3 @@ +. /etc/hotplug/hotplug.functions +sleep 1 +mesg `/root/multipath scsi $DEVPATH` diff --git a/extras/multipath/unsused.c b/extras/multipath/unsused.c new file mode 100644 index 00000000..ecdd695a --- /dev/null +++ b/extras/multipath/unsused.c @@ -0,0 +1,52 @@ +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; +} + +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; + +} -- 2.39.5