--- /dev/null
+Christophe Varoqui, <christophe.varoqui@free.fr>
--- /dev/null
+
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+That's all there is to it!
--- /dev/null
+2004-03-06 multipath-tools-0.1.1
+ * include dlist.h in multipath main.c (PM Hahn)
+ * typo in hotplug script (PM Hahn)
+ * pass -9 opt to gzip for manpages (PM Hahn)
+2004-03-05 multipath-tools-0.1.0
+ * add the group_by_tur policy
+ * add the multipathd daemon for pathchecking & DM hot-reconfig
+ * multipath doesn't run twice
+ * massive cleanups, and code restructuring
+ * Avoid Kernel Bug when passing too small a buffer in do_inq()
+ * Sync with 2.6.3-udm4 target synthax (no more PG prio)
+2004-02-21 multipath-018
+ * From the Debian SID inclusion review (Philipp Matthias Hahn)
+ * use DESTDIR install prefix in the Makefile
+ * add man pages for devmap_name & multipath
+ * correct libsysfs.h includes
+ * fork the hotplug script in its own shell
+ * Sync with the kernel device mapper code as of 2.6.3-udm3
+ ie. Remove the test interval parameter and its uses
+ * Remove superfluous scsi parameter passed from hotplug
+ * Add the man pages to the [un]install targets
+2004-02-17 multipath-017
+ * remove the restrictive -f flag.
+ Introduce a more generic "-m iopolicy" one.
+ * remove useless "int with_sysfs" in env struct
+2004-02-04 multipath-016
+ * add a GROUP_BY_SERIAL flag. This should be useful for
+ controlers that activate they spare paths on simple IO
+ submition with a penalty. The StorageWorks HW defaults to
+ this mode, even if the MULTIBUS mode is OK.
+ * remove unused sg_err.c
+ * big restructuring : split devinfo.c from main.c. Export :
+ * void basename (char *, char *);
+ * int get_serial (int, char *);
+ * int get_lun_strings (char *, char *, char *, char *);
+ * int get_evpd_wwid(char *, char *);
+ * long get_disk_size (char *);
+ * stop passing struct env as param
+ * add devmap_name proggy for udev to name devmaps as per their
+ internal DM name and not only by their sysfs enum name (dm-*)
+ The corresponding udev.rules line is :
+ KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c"
+ * remove make_dm_node fn & call. Rely on udev for this.
+ * don't rely on the linux symlink in the udev/klibc dir since
+ udev build doesn't use it anymore. This corrects build breakage
+2004-01-19 multipath-013
+ * update the DM target synthax to the 2.6.0-udm5 style
+2003-12-29 multipath-012
+ * check hotplug event refers to a block device; if not exit early
+ * refresh doc
+ * add the uninstall target in Makefile
+2003-12-22 multipath-010
+ * tweak the install target in Makefile
+ * stop passing fds as argument : this change enable a strict
+ segregation of ugly 2.4 code
+ * sysfs version of get_lun_strings()
+ * be careful about the return of get_unique_id() since errors
+ formerly caught up by if(open()) in the caller fn are now returned
+ by get_unique_id()
+ * send get_serial() in unused.c
+ * introduce dm-simplecmd for RESUME & SUSPEND requests
+ * split add_map() in setup_map() & dm-addmap()
+ * setup_map() correctly submits "SUSPEND-RELOAD-RESUME or CREATE"
+ sequences instead of the bogus "RELOAD or CREATE"
+ * don't print .sg_dev if equal to .dev (2.6) in print_path()
+ * since the kernel code handles defective paths, remove all
+ code to cope with them :
+ * move do_tur() to unused.c
+ * remove .state from path struct
+ * remove .state settings & conditionals
+ * add a cmdline switch to force maps to failover mode,
+ ie 1 path per priority group
+ * add default policies to the whitelist array (spread io ==
+ MULTIBUS / io forced to 1 path == FAILOVER)
+ * move get_disk_size() call out of add_map() to coalesce()
+ * comment tricky coalesce() fn
+ * bogus unsused.c file renamed to unused.c
+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.
--- /dev/null
+# Makefile
+#
+# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
+
+SUBDIRS = libdevmapper devmap_name multipath multipathd
+
+recurse:
+ @for dir in $(SUBDIRS); do\
+ $(MAKE) -C $$dir ; \
+ done
+
+recurse_clean:
+ @for dir in $(SUBDIRS); do\
+ $(MAKE) -C $$dir clean ; \
+ done
+
+recurse_install:
+ @for dir in $(SUBDIRS); do\
+ $(MAKE) -C $$dir install ; \
+ done
+
+recurse_uninstall:
+ @for dir in $(SUBDIRS); do\
+ $(MAKE) -C $$dir uninstall ; \
+ done
+
+all: recurse
+ @echo ""
+ @echo "Make complete"
+
+clean: recurse_clean
+ @echo ""
+ @echo "Make complete"
+
+install: recurse_install
+ @echo ""
+ @echo "Make complete"
+
+uninstall: recurse_uninstall
+ @echo ""
+ @echo "Make complete"
--- /dev/null
+Dependancies :
+==============
+
+o libdevmapper : comes with device-mapper-XXXX.tar.gz
+ See www.sistina.com
+ This lib has been dropped in the multipath tree
+o libsysfs : comes with sysutils or udev
+ See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
+o Linux kernel 2.6.0 with udm5 patchset
+ http://people.sistina.com/~thornber/dm/
+o udev
+ See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
+
+How it works :
+==============
+
+Fill the all_paths array. Each path store this info :
+
+struct path {
+ char dev[FILE_NAME_SIZE];
+ char sg_dev[FILE_NAME_SIZE];
+ struct scsi_idlun scsi_id;
+ struct sg_id sg_id;
+ int state;
+ char wwid[WWID_SIZE];
+};
+
+scsi_id, sg_dev and sg_id are only really useful for 2.4
+kernels, for which SG cmnds must go through sg devs.
+In 2.5+ we have the nice opportunity to send SG cmnds
+through SCSI bdevs.
+
+For 2.4 compat, we pivot on idlun tupple to map sg devs
+to SCSI bdevs.
+
+2.4 does not do device enumeration, so we must scan a
+defined number of sg devs and scsi bdevs. Good enough.
+In 2.5+, we rely on libsysfs (sysutils) to access to
+sysfs device enums.
+
+the wwid is retrieved by a switch fonction. Only White
+Listed HW can filled this field. For now every FC array
+HW listed in kernel's devinfo.c is White Listed, assuming
+the WWID is stored is the SCSI-3 standard 0x83 EVPD page.
+
+When all_paths is filled, we coalesce the paths and store
+the result in mp array. Each mp is a struct like this :
+
+struct multipath {
+ char wwid[WWID_SIZE];
+ int npaths;
+ int pindex[MAX_MP_PATHS];
+};
+
+When mp is filled, the device maps are fed to the kernel
+through libdevmapper.
+
+The naming of the corresponding block device is handeld
+by udev with the help of the devmap_name proggy. It is
+called by the following rule in /etc/udev/udev.rules :
+KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \
+NAME="%k", SYMLINK="%c"
+
+Notes :
+=======
+
+o On 2.4, make sure you have enough /dev/sg* nodes
+ (/dev/MAKEDEV if necesary). Same goes for /dev/sd*
+
+o path coalescing relies on a path unique id being found.
+ This unique id, lacking a standard method, is vendor
+ specific. A switch function (get_unique_id) is present
+ and an example function is provided for storageworks
+ arrays (get_evpd_wwid). Feel free to enrich
+ with hardware you have at hand :)
+
+o The kernel does NOT manage properly ghosts paths
+ with StorageWorks HW. Seems nobody cares after a load
+ of posts to linux-scsi.
+
+o 2.4.21 version of DM does not like even segment size.
+ if you enconter pbs with this, upgrade DM.
+
+Credits :
+=========
+
+o Heavy cut'n paste from sg_utils. Thanks goes to D.
+ Gilbert.
+o Light cut'n paste from dmsetup. Thanks Joe Thornber.
+o Greg KH for the nice sysfs API.
--- /dev/null
+# Makefile
+#
+# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
+
+EXEC = devmap_name
+
+prefix =
+exec_prefix = ${prefix}
+bindir = ${exec_prefix}/sbin
+udevdir = ../../..
+klibcdir = $(udevdir)/klibc
+mandir = /usr/share/man/man8
+libdmdir = ../libdevmapper
+
+CC = gcc
+GZIP = /bin/gzip -9 -c
+
+GCCINCDIR := ${shell $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp"}
+KERNEL_DIR = /lib/modules/${shell uname -r}/build
+CFLAGS = -pipe -g -O2 -Wall -Wunused -Wstrict-prototypes -nostdinc \
+ -I$(klibcdir)/klibc/include -I$(klibcdir)/klibc/include/bits32 \
+ -I$(GCCINCDIR) -I$(KERNEL_DIR)/include -I$(sysfsdir) -I.
+
+OBJS = devmap_name.o
+CRT0 = $(klibcdir)/klibc/crt0.o
+LIB = $(klibcdir)/klibc/libc.a
+LIBGCC := $(shell $(CC) -print-libgcc-file-name )
+
+DMOBJS = $(libdmdir)/libdm-common.o $(libdmdir)/ioctl/libdevmapper.o
+
+$(EXEC): $(OBJS)
+ $(LD) -o $(EXEC) $(CRT0) $(OBJS) $(DMOBJS) $(LIB) $(LIBGCC)
+ strip $(EXEC)
+ $(GZIP) $(EXEC).8 > $(EXEC).8.gz
+
+clean:
+ rm -f core *.o $(EXEC) *.gz
+
+install:
+ install -d $(DESTDIR)$(bindir)
+ install -m 755 $(EXEC) $(DESTDIR)$(bindir)/
+ install -d $(DESTDIR)$(mandir)
+ install -m 644 $(EXEC).8.gz $(DESTDIR)$(mandir)
+
+uninstall:
+ rm $(DESTDIR)$(bindir)/$(EXEC)
+ rm $(DESTDIR)$(mandir)/$(EXEC).8.gz
--- /dev/null
+.TH DEVMAP_NAME 8 "February 2004" "" "Linux Administrator's Manual"
+.SH NAME
+devmap_name \- Query device-mapper name
+.SH SYNOPSIS
+.BI devmap_name " major minor"
+.SH DESCRIPTION
+.B devmap_name
+queries the device-mapper for the name for the device
+specified by
+.I major
+and
+.I minor
+number.
+.br
+.B devmap_name
+can be called from
+.B udev
+by the following rule in
+.IR /etc/udev/udev.rules :
+.sp
+.nf
+KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", \\
+ NAME="%k", SYMLINK="%c"
+.fi
+.SH "SEE ALSO"
+.BR udev (8),
+.BR dmsetup (8)
+.SH AUTHORS
+.B devmap_name
+was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <linux/kdev_t.h>
+
+#include "../libdevmapper/libdevmapper.h"
+
+static void usage(char * progname) {
+ fprintf(stderr, "usage : %s major minor\n", progname);
+ exit(1);
+}
+
+int main(int argc, char **argv)
+{
+ int r = 0;
+ struct dm_names *names;
+ unsigned next = 0;
+ int major, minor;
+
+ /* sanity check */
+ if (argc != 3)
+ usage(argv[0]);
+
+ major = atoi(argv[1]);
+ minor = atoi(argv[2]);
+
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+ return 0;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!(names = dm_task_get_names(dmt)))
+ goto out;
+
+ if (!names->dev) {
+ printf("No devices found\n");
+ goto out;
+ }
+
+ do {
+ names = (void *) names + next;
+ if ((int) MAJOR(names->dev) == major &&
+ (int) MINOR(names->dev) == minor) {
+ printf("%s\n", names->name);
+ goto out;
+ }
+ next = names->next;
+ } while (next);
+
+ /* No correspondance found */
+ r = 1;
+
+ out:
+ dm_task_destroy(dmt);
+ return r;
+}
+
--- /dev/null
+# Makefile
+#
+# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
+
+CC = gcc
+udevdir = ../../..
+klibcdir = $(udevdir)/klibc
+
+CC = gcc
+GCCINCDIR := ${shell $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp"}
+KERNEL_DIR = /lib/modules/${shell uname -r}/build
+
+CFLAGS = -pipe -g -O2 -Wall -Wunused -Wstrict-prototypes -nostdinc \
+ -I$(klibcdir)/klibc/include -I$(klibcdir)/klibc/include/bits32 \
+ -I$(GCCINCDIR) -I$(KERNEL_DIR)/include -I. -Iioctl
+
+OBJS = ioctl/libdevmapper.o libdm-common.o
+
+all: $(OBJS)
+ @echo ""
+ @echo "Make complete"
+
+clean:
+ rm -f core *.o ioctl/*.o ioctl/*.so
+
+install:
+
+uninstall:
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#include "libdm-targets.h"
+#include "libdm-common.h"
+
+#ifdef DM_COMPAT
+# include "libdm-compat.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <dirent.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <limits.h>
+
+#ifdef linux
+# include <linux/limits.h>
+# include <linux/kdev_t.h>
+# include <linux/dm-ioctl.h>
+#else
+# define MAJOR(x) major((x))
+# define MINOR(x) minor((x))
+# define MKDEV(x,y) makedev((x),(y))
+#endif
+
+/*
+ * Ensure build compatibility.
+ * The hard-coded versions here are the highest present
+ * in the _cmd_data arrays.
+ */
+
+#if !((DM_VERSION_MAJOR == 1 && DM_VERSION_MINOR >= 0) || \
+ (DM_VERSION_MAJOR == 4 && DM_VERSION_MINOR >= 0))
+#error The version of dm-ioctl.h included is incompatible.
+#endif
+
+/* dm major version no for running kernel */
+static int _dm_version = DM_VERSION_MAJOR;
+static int _log_suppress = 0;
+
+static int _control_fd = -1;
+static int _version_checked = 0;
+static int _version_ok = 1;
+
+/*
+ * Support both old and new major numbers to ease the transition.
+ * Clumsy, but only temporary.
+ */
+#if DM_VERSION_MAJOR == 4 && defined(DM_COMPAT)
+const int _dm_compat = 1;
+#else
+const int _dm_compat = 0;
+#endif
+
+
+/* *INDENT-OFF* */
+static struct cmd_data _cmd_data_v4[] = {
+ {"create", DM_DEV_CREATE, {4, 0, 0}},
+ {"reload", DM_TABLE_LOAD, {4, 0, 0}},
+ {"remove", DM_DEV_REMOVE, {4, 0, 0}},
+ {"remove_all", DM_REMOVE_ALL, {4, 0, 0}},
+ {"suspend", DM_DEV_SUSPEND, {4, 0, 0}},
+ {"resume", DM_DEV_SUSPEND, {4, 0, 0}},
+ {"info", DM_DEV_STATUS, {4, 0, 0}},
+ {"deps", DM_TABLE_DEPS, {4, 0, 0}},
+ {"rename", DM_DEV_RENAME, {4, 0, 0}},
+ {"version", DM_VERSION, {4, 0, 0}},
+ {"status", DM_TABLE_STATUS, {4, 0, 0}},
+ {"table", DM_TABLE_STATUS, {4, 0, 0}},
+ {"waitevent", DM_DEV_WAIT, {4, 0, 0}},
+ {"names", DM_LIST_DEVICES, {4, 0, 0}},
+ {"clear", DM_TABLE_CLEAR, {4, 0, 0}},
+ {"mknodes", DM_DEV_STATUS, {4, 0, 0}},
+};
+/* *INDENT-ON* */
+
+#define ALIGNMENT_V1 sizeof(int)
+#define ALIGNMENT 8
+
+/* FIXME Rejig library to record & use errno instead */
+#ifndef DM_EXISTS_FLAG
+# define DM_EXISTS_FLAG 0x00000004
+#endif
+
+static void *_align(void *ptr, unsigned int a)
+{
+ register unsigned long agn = --a;
+
+ return (void *) (((unsigned long) ptr + agn) & ~agn);
+}
+
+static int _open_control(void)
+{
+ char control[PATH_MAX];
+
+ if (_control_fd != -1)
+ return 1;
+
+ snprintf(control, sizeof(control), "%s/control", dm_dir());
+
+ if ((_control_fd = open(control, O_RDWR)) < 0) {
+ log_error("%s: open failed: %s", control, strerror(errno));
+ log_error("Is device-mapper driver missing from kernel?");
+ return 0;
+ }
+
+ return 1;
+}
+
+void dm_task_destroy(struct dm_task *dmt)
+{
+ struct target *t, *n;
+
+ for (t = dmt->head; t; t = n) {
+ n = t->next;
+ free(t->params);
+ free(t->type);
+ free(t);
+ }
+
+ if (dmt->dev_name)
+ free(dmt->dev_name);
+
+ if (dmt->newname)
+ free(dmt->newname);
+
+ if (dmt->dmi.v4)
+ free(dmt->dmi.v4);
+
+ if (dmt->uuid)
+ free(dmt->uuid);
+
+ free(dmt);
+}
+
+/*
+ * Protocol Version 1 compatibility functions.
+ */
+
+#ifdef DM_COMPAT
+
+static int _dm_task_get_driver_version_v1(struct dm_task *dmt, char *version,
+ size_t size)
+{
+ unsigned int *v;
+
+ if (!dmt->dmi.v1) {
+ version[0] = '\0';
+ return 0;
+ }
+
+ v = dmt->dmi.v1->version;
+ snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]);
+ return 1;
+}
+
+/* Unmarshall the target info returned from a status call */
+static int _unmarshal_status_v1(struct dm_task *dmt, struct dm_ioctl_v1 *dmi)
+{
+ char *outbuf = (char *) dmi + dmi->data_start;
+ char *outptr = outbuf;
+ int32_t i;
+ struct dm_target_spec_v1 *spec;
+
+ for (i = 0; i < dmi->target_count; i++) {
+ spec = (struct dm_target_spec_v1 *) outptr;
+
+ if (!dm_task_add_target(dmt, spec->sector_start,
+ (uint64_t) spec->length,
+ spec->target_type,
+ outptr + sizeof(*spec)))
+ return 0;
+
+ outptr = outbuf + spec->next;
+ }
+
+ return 1;
+}
+
+static int _dm_format_dev_v1(char *buf, int bufsize, uint32_t dev_major,
+ uint32_t dev_minor)
+{
+ int r;
+
+ if (bufsize < 8)
+ return 0;
+
+ r = snprintf(buf, bufsize, "%03x:%03x", dev_major, dev_minor);
+ if (r < 0 || r > bufsize - 1)
+ return 0;
+
+ return 1;
+}
+
+static int _dm_task_get_info_v1(struct dm_task *dmt, struct dm_info *info)
+{
+ if (!dmt->dmi.v1)
+ return 0;
+
+ memset(info, 0, sizeof(*info));
+
+ info->exists = dmt->dmi.v1->flags & DM_EXISTS_FLAG ? 1 : 0;
+ if (!info->exists)
+ return 1;
+
+ info->suspended = dmt->dmi.v1->flags & DM_SUSPEND_FLAG ? 1 : 0;
+ info->read_only = dmt->dmi.v1->flags & DM_READONLY_FLAG ? 1 : 0;
+ info->target_count = dmt->dmi.v1->target_count;
+ info->open_count = dmt->dmi.v1->open_count;
+ info->event_nr = 0;
+ info->major = MAJOR(dmt->dmi.v1->dev);
+ info->minor = MINOR(dmt->dmi.v1->dev);
+ info->live_table = 1;
+ info->inactive_table = 0;
+
+ return 1;
+}
+
+static const char *_dm_task_get_name_v1(struct dm_task *dmt)
+{
+ return (dmt->dmi.v1->name);
+}
+
+static const char *_dm_task_get_uuid_v1(struct dm_task *dmt)
+{
+ return (dmt->dmi.v1->uuid);
+}
+
+static struct dm_deps *_dm_task_get_deps_v1(struct dm_task *dmt)
+{
+ log_error("deps version 1 no longer supported by libdevmapper");
+ return NULL;
+}
+
+static struct dm_names *_dm_task_get_names_v1(struct dm_task *dmt)
+{
+ return (struct dm_names *) (((void *) dmt->dmi.v1) +
+ dmt->dmi.v1->data_start);
+}
+
+static void *_add_target_v1(struct target *t, void *out, void *end)
+{
+ void *out_sp = out;
+ struct dm_target_spec_v1 sp;
+ size_t sp_size = sizeof(struct dm_target_spec_v1);
+ int len;
+ const char no_space[] = "Ran out of memory building ioctl parameter";
+
+ out += sp_size;
+ if (out >= end) {
+ log_error(no_space);
+ return NULL;
+ }
+
+ sp.status = 0;
+ sp.sector_start = t->start;
+ sp.length = t->length;
+ strncpy(sp.target_type, t->type, sizeof(sp.target_type));
+
+ len = strlen(t->params);
+
+ if ((out + len + 1) >= end) {
+ log_error(no_space);
+
+ log_error("t->params= '%s'", t->params);
+ return NULL;
+ }
+ strcpy((char *) out, t->params);
+ out += len + 1;
+
+ /* align next block */
+ out = _align(out, ALIGNMENT_V1);
+
+ sp.next = out - out_sp;
+
+ memcpy(out_sp, &sp, sp_size);
+
+ return out;
+}
+
+static struct dm_ioctl_v1 *_flatten_v1(struct dm_task *dmt)
+{
+ const size_t min_size = 16 * 1024;
+ const int (*version)[3];
+
+ struct dm_ioctl_v1 *dmi;
+ struct target *t;
+ size_t len = sizeof(struct dm_ioctl_v1);
+ void *b, *e;
+ int count = 0;
+
+ for (t = dmt->head; t; t = t->next) {
+ len += sizeof(struct dm_target_spec_v1);
+ len += strlen(t->params) + 1 + ALIGNMENT_V1;
+ count++;
+ }
+
+ if (count && dmt->newname) {
+ log_error("targets and newname are incompatible");
+ return NULL;
+ }
+
+ if (dmt->newname)
+ len += strlen(dmt->newname) + 1;
+
+ /*
+ * Give len a minimum size so that we have space to store
+ * dependencies or status information.
+ */
+ if (len < min_size)
+ len = min_size;
+
+ if (!(dmi = malloc(len)))
+ return NULL;
+
+ memset(dmi, 0, len);
+
+ version = &_cmd_data_v1[dmt->type].version;
+
+ dmi->version[0] = (*version)[0];
+ dmi->version[1] = (*version)[1];
+ dmi->version[2] = (*version)[2];
+
+ dmi->data_size = len;
+ dmi->data_start = sizeof(struct dm_ioctl_v1);
+
+ if (dmt->dev_name)
+ strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
+
+ if (dmt->type == DM_DEVICE_SUSPEND)
+ dmi->flags |= DM_SUSPEND_FLAG;
+ if (dmt->read_only)
+ dmi->flags |= DM_READONLY_FLAG;
+
+ if (dmt->minor >= 0) {
+ if (dmt->major <= 0) {
+ log_error("Missing major number for persistent device");
+ return NULL;
+ }
+ dmi->flags |= DM_PERSISTENT_DEV_FLAG;
+ dmi->dev = MKDEV(dmt->major, dmt->minor);
+ }
+
+ if (dmt->uuid)
+ strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid));
+
+ dmi->target_count = count;
+
+ b = (void *) (dmi + 1);
+ e = (void *) ((char *) dmi + len);
+
+ for (t = dmt->head; t; t = t->next)
+ if (!(b = _add_target_v1(t, b, e)))
+ goto bad;
+
+ if (dmt->newname)
+ strcpy(b, dmt->newname);
+
+ return dmi;
+
+ bad:
+ free(dmi);
+ return NULL;
+}
+
+static int _dm_names_v1(struct dm_ioctl_v1 *dmi)
+{
+ const char *dev_dir = dm_dir();
+ int r = 1, len;
+ const char *name;
+ struct dirent *dirent;
+ DIR *d;
+ struct dm_names *names, *old_names = NULL;
+ void *end = (void *) dmi + dmi->data_size;
+ struct stat buf;
+ char path[PATH_MAX];
+
+ if (!(d = opendir(dev_dir))) {
+ log_error("%s: opendir failed: %s", dev_dir, strerror(errno));
+ return 0;
+ }
+
+ names = (struct dm_names *) ((void *) dmi + dmi->data_start);
+
+ names->dev = 0; /* Flags no data */
+
+ while ((dirent = readdir(d))) {
+ name = dirent->d_name;
+
+ if (name[0] == '.' || !strcmp(name, "control"))
+ continue;
+
+ if (old_names)
+ old_names->next = (uint32_t) ((void *) names -
+ (void *) old_names);
+ snprintf(path, sizeof(path), "%s/%s", dev_dir, name);
+ if (stat(path, &buf)) {
+ log_error("%s: stat failed: %s", path, strerror(errno));
+ continue;
+ }
+ if (!S_ISBLK(buf.st_mode))
+ continue;
+ names->dev = (uint64_t) buf.st_rdev;
+ names->next = 0;
+ len = strlen(name);
+ if (((void *) (names + 1) + len + 1) >= end) {
+ log_error("Insufficient buffer space for device list");
+ r = 0;
+ break;
+ }
+
+ strcpy(names->name, name);
+
+ old_names = names;
+ names = _align((void *) ++names + len + 1, ALIGNMENT);
+ }
+
+ if (closedir(d))
+ log_error("%s: closedir failed: %s", dev_dir, strerror(errno));
+
+ return r;
+}
+
+static int _dm_task_run_v1(struct dm_task *dmt)
+{
+ struct dm_ioctl_v1 *dmi;
+ unsigned int command;
+
+ dmi = _flatten_v1(dmt);
+ if (!dmi) {
+ log_error("Couldn't create ioctl argument");
+ return 0;
+ }
+
+ if (!_open_control())
+ return 0;
+
+ if ((unsigned) dmt->type >=
+ (sizeof(_cmd_data_v1) / sizeof(*_cmd_data_v1))) {
+ log_error("Internal error: unknown device-mapper task %d",
+ dmt->type);
+ goto bad;
+ }
+
+ command = _cmd_data_v1[dmt->type].cmd;
+
+ if (dmt->type == DM_DEVICE_TABLE)
+ dmi->flags |= DM_STATUS_TABLE_FLAG;
+
+ log_debug("dm %s %s %s %s", _cmd_data_v1[dmt->type].name, dmi->name,
+ dmi->uuid, dmt->newname ? dmt->newname : "");
+ if (dmt->type == DM_DEVICE_LIST) {
+ if (!_dm_names_v1(dmi))
+ goto bad;
+ } else if (ioctl(_control_fd, command, dmi) < 0) {
+ if (_log_suppress)
+ log_verbose("device-mapper ioctl cmd %d failed: %s",
+ _IOC_NR(command), strerror(errno));
+ else
+ log_error("device-mapper ioctl cmd %d failed: %s",
+ _IOC_NR(command), strerror(errno));
+ goto bad;
+ }
+
+ switch (dmt->type) {
+ case DM_DEVICE_CREATE:
+ add_dev_node(dmt->dev_name, MAJOR(dmi->dev), MINOR(dmi->dev));
+ break;
+
+ case DM_DEVICE_REMOVE:
+ rm_dev_node(dmt->dev_name);
+ break;
+
+ case DM_DEVICE_RENAME:
+ rename_dev_node(dmt->dev_name, dmt->newname);
+ break;
+
+ case DM_DEVICE_MKNODES:
+ if (dmi->flags & DM_EXISTS_FLAG)
+ add_dev_node(dmt->dev_name, MAJOR(dmi->dev),
+ MINOR(dmi->dev));
+ else
+ rm_dev_node(dmt->dev_name);
+ break;
+
+ case DM_DEVICE_STATUS:
+ case DM_DEVICE_TABLE:
+ if (!_unmarshal_status_v1(dmt, dmi))
+ goto bad;
+ break;
+
+ case DM_DEVICE_SUSPEND:
+ case DM_DEVICE_RESUME:
+ dmt->type = DM_DEVICE_INFO;
+ if (!dm_task_run(dmt))
+ goto bad;
+ free(dmi); /* We'll use what info returned */
+ return 1;
+ }
+
+ dmt->dmi.v1 = dmi;
+ return 1;
+
+ bad:
+ free(dmi);
+ return 0;
+}
+
+#endif
+
+/*
+ * Protocol Version 4 functions.
+ */
+
+int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size)
+{
+ unsigned int *v;
+
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_driver_version_v1(dmt, version, size);
+#endif
+
+ if (!dmt->dmi.v4) {
+ version[0] = '\0';
+ return 0;
+ }
+
+ v = dmt->dmi.v4->version;
+ snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]);
+ return 1;
+}
+
+static int _check_version(char *version, size_t size, int log_suppress)
+{
+ struct dm_task *task;
+ int r;
+
+ if (!(task = dm_task_create(DM_DEVICE_VERSION))) {
+ log_error("Failed to get device-mapper version");
+ version[0] = '\0';
+ return 0;
+ }
+
+ if (log_suppress)
+ _log_suppress = 1;
+
+ r = dm_task_run(task);
+ dm_task_get_driver_version(task, version, size);
+ dm_task_destroy(task);
+ _log_suppress = 0;
+
+ return r;
+}
+
+/*
+ * Find out device-mapper's major version number the first time
+ * this is called and whether or not we support it.
+ */
+int dm_check_version(void)
+{
+ char libversion[64], dmversion[64];
+ const char *compat = "";
+
+ if (_version_checked)
+ return _version_ok;
+
+ _version_checked = 1;
+
+ if (_check_version(dmversion, sizeof(dmversion), _dm_compat))
+ return 1;
+
+ if (!_dm_compat)
+ goto bad;
+
+ log_verbose("device-mapper ioctl protocol version %d failed. "
+ "Trying protocol version 1.", _dm_version);
+ _dm_version = 1;
+ if (_check_version(dmversion, sizeof(dmversion), 0)) {
+ log_verbose("Using device-mapper ioctl protocol version 1");
+ return 1;
+ }
+
+ compat = "(compat)";
+
+ dm_get_library_version(libversion, sizeof(libversion));
+
+ log_error("Incompatible libdevmapper %s%s and kernel driver %s",
+ libversion, compat, dmversion);
+
+ bad:
+ _version_ok = 0;
+ return 0;
+}
+
+void *dm_get_next_target(struct dm_task *dmt, void *next,
+ uint64_t *start, uint64_t *length,
+ char **target_type, char **params)
+{
+ struct target *t = (struct target *) next;
+
+ if (!t)
+ t = dmt->head;
+
+ if (!t)
+ return NULL;
+
+ *start = t->start;
+ *length = t->length;
+ *target_type = t->type;
+ *params = t->params;
+
+ return t->next;
+}
+
+/* Unmarshall the target info returned from a status call */
+static int _unmarshal_status(struct dm_task *dmt, struct dm_ioctl *dmi)
+{
+ char *outbuf = (char *) dmi + dmi->data_start;
+ char *outptr = outbuf;
+ uint32_t i;
+ struct dm_target_spec *spec;
+
+ for (i = 0; i < dmi->target_count; i++) {
+ spec = (struct dm_target_spec *) outptr;
+ if (!dm_task_add_target(dmt, spec->sector_start,
+ spec->length,
+ spec->target_type,
+ outptr + sizeof(*spec)))
+ return 0;
+
+ outptr = outbuf + spec->next;
+ }
+
+ return 1;
+}
+
+int dm_format_dev(char *buf, int bufsize, uint32_t dev_major,
+ uint32_t dev_minor)
+{
+ int r;
+
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_format_dev_v1(buf, bufsize, dev_major, dev_minor);
+#endif
+
+ if (bufsize < 8)
+ return 0;
+
+ r = snprintf(buf, bufsize, "%03u:%03u", dev_major, dev_minor);
+ if (r < 0 || r > bufsize - 1)
+ return 0;
+
+ return 1;
+}
+
+int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
+{
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_info_v1(dmt, info);
+#endif
+
+ if (!dmt->dmi.v4)
+ return 0;
+
+ memset(info, 0, sizeof(*info));
+
+ info->exists = dmt->dmi.v4->flags & DM_EXISTS_FLAG ? 1 : 0;
+ if (!info->exists)
+ return 1;
+
+ info->suspended = dmt->dmi.v4->flags & DM_SUSPEND_FLAG ? 1 : 0;
+ info->read_only = dmt->dmi.v4->flags & DM_READONLY_FLAG ? 1 : 0;
+ info->live_table = dmt->dmi.v4->flags & DM_ACTIVE_PRESENT_FLAG ? 1 : 0;
+ info->inactive_table = dmt->dmi.v4->flags & DM_INACTIVE_PRESENT_FLAG ?
+ 1 : 0;
+ info->target_count = dmt->dmi.v4->target_count;
+ info->open_count = dmt->dmi.v4->open_count;
+ info->event_nr = dmt->dmi.v4->event_nr;
+ info->major = MAJOR(dmt->dmi.v4->dev);
+ info->minor = MINOR(dmt->dmi.v4->dev);
+
+ return 1;
+}
+
+const char *dm_task_get_name(struct dm_task *dmt)
+{
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_name_v1(dmt);
+#endif
+
+ return (dmt->dmi.v4->name);
+}
+
+const char *dm_task_get_uuid(struct dm_task *dmt)
+{
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_uuid_v1(dmt);
+#endif
+
+ return (dmt->dmi.v4->uuid);
+}
+
+struct dm_deps *dm_task_get_deps(struct dm_task *dmt)
+{
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_deps_v1(dmt);
+#endif
+
+ return (struct dm_deps *) (((void *) dmt->dmi.v4) +
+ dmt->dmi.v4->data_start);
+}
+
+struct dm_names *dm_task_get_names(struct dm_task *dmt)
+{
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_get_names_v1(dmt);
+#endif
+
+ return (struct dm_names *) (((void *) dmt->dmi.v4) +
+ dmt->dmi.v4->data_start);
+}
+
+int dm_task_set_ro(struct dm_task *dmt)
+{
+ dmt->read_only = 1;
+ return 1;
+}
+
+int dm_task_set_newname(struct dm_task *dmt, const char *newname)
+{
+ if (!(dmt->newname = strdup(newname))) {
+ log_error("dm_task_set_newname: strdup(%s) failed", newname);
+ return 0;
+ }
+
+ return 1;
+}
+
+int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr)
+{
+ dmt->event_nr = event_nr;
+
+ return 1;
+}
+
+struct target *create_target(uint64_t start, uint64_t len, const char *type,
+ const char *params)
+{
+ struct target *t = malloc(sizeof(*t));
+
+ if (!t) {
+ log_error("create_target: malloc(%d) failed", sizeof(*t));
+ return NULL;
+ }
+
+ memset(t, 0, sizeof(*t));
+
+ if (!(t->params = strdup(params))) {
+ log_error("create_target: strdup(params) failed");
+ goto bad;
+ }
+
+ if (!(t->type = strdup(type))) {
+ log_error("create_target: strdup(type) failed");
+ goto bad;
+ }
+
+ t->start = start;
+ t->length = len;
+ return t;
+
+ bad:
+ free(t->params);
+ free(t->type);
+ free(t);
+ return NULL;
+}
+
+static void *_add_target(struct target *t, void *out, void *end)
+{
+ void *out_sp = out;
+ struct dm_target_spec sp;
+ size_t sp_size = sizeof(struct dm_target_spec);
+ int len;
+ const char no_space[] = "Ran out of memory building ioctl parameter";
+
+ out += sp_size;
+ if (out >= end) {
+ log_error(no_space);
+ return NULL;
+ }
+
+ sp.status = 0;
+ sp.sector_start = t->start;
+ sp.length = t->length;
+ strncpy(sp.target_type, t->type, sizeof(sp.target_type));
+
+ len = strlen(t->params);
+
+ if ((out + len + 1) >= end) {
+ log_error(no_space);
+
+ log_error("t->params= '%s'", t->params);
+ return NULL;
+ }
+ strcpy((char *) out, t->params);
+ out += len + 1;
+
+ /* align next block */
+ out = _align(out, ALIGNMENT);
+
+ sp.next = out - out_sp;
+ memcpy(out_sp, &sp, sp_size);
+
+ return out;
+}
+
+static struct dm_ioctl *_flatten(struct dm_task *dmt)
+{
+ const size_t min_size = 16 * 1024;
+ const int (*version)[3];
+
+ struct dm_ioctl *dmi;
+ struct target *t;
+ size_t len = sizeof(struct dm_ioctl);
+ void *b, *e;
+ int count = 0;
+
+ for (t = dmt->head; t; t = t->next) {
+ len += sizeof(struct dm_target_spec);
+ len += strlen(t->params) + 1 + ALIGNMENT;
+ count++;
+ }
+
+ if (count && dmt->newname) {
+ log_error("targets and newname are incompatible");
+ return NULL;
+ }
+
+ if (dmt->newname)
+ len += strlen(dmt->newname) + 1;
+
+ /*
+ * Give len a minimum size so that we have space to store
+ * dependencies or status information.
+ */
+ if (len < min_size)
+ len = min_size;
+
+ if (!(dmi = malloc(len)))
+ return NULL;
+
+ memset(dmi, 0, len);
+
+ version = &_cmd_data_v4[dmt->type].version;
+
+ dmi->version[0] = (*version)[0];
+ dmi->version[1] = (*version)[1];
+ dmi->version[2] = (*version)[2];
+
+ dmi->data_size = len;
+ dmi->data_start = sizeof(struct dm_ioctl);
+
+ if (dmt->dev_name)
+ strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
+
+ if (dmt->type == DM_DEVICE_SUSPEND)
+ dmi->flags |= DM_SUSPEND_FLAG;
+ if (dmt->read_only)
+ dmi->flags |= DM_READONLY_FLAG;
+
+ if (dmt->minor >= 0) {
+ if (dmt->major <= 0) {
+ log_error("Missing major number for persistent device");
+ return NULL;
+ }
+ dmi->flags |= DM_PERSISTENT_DEV_FLAG;
+ dmi->dev = MKDEV(dmt->major, dmt->minor);
+ }
+
+ if (dmt->uuid)
+ strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid));
+
+ dmi->target_count = count;
+ dmi->event_nr = dmt->event_nr;
+
+ b = (void *) (dmi + 1);
+ e = (void *) ((char *) dmi + len);
+
+ for (t = dmt->head; t; t = t->next)
+ if (!(b = _add_target(t, b, e)))
+ goto bad;
+
+ if (dmt->newname)
+ strcpy(b, dmt->newname);
+
+ return dmi;
+
+ bad:
+ free(dmi);
+ return NULL;
+}
+
+static int _create_and_load_v4(struct dm_task *dmt)
+{
+ struct dm_task *task;
+ int r;
+
+ /* Use new task struct to create the device */
+ if (!(task = dm_task_create(DM_DEVICE_CREATE))) {
+ log_error("Failed to create device-mapper task struct");
+ return 0;
+ }
+
+ /* Copy across relevant fields */
+ if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) {
+ dm_task_destroy(task);
+ return 0;
+ }
+
+ if (dmt->uuid && !dm_task_set_uuid(task, dmt->uuid)) {
+ dm_task_destroy(task);
+ return 0;
+ }
+
+ task->major = dmt->major;
+ task->minor = dmt->minor;
+
+ r = dm_task_run(task);
+ dm_task_destroy(task);
+ if (!r)
+ return r;
+
+ /* Next load the table */
+ if (!(task = dm_task_create(DM_DEVICE_RELOAD))) {
+ log_error("Failed to create device-mapper task struct");
+ return 0;
+ }
+
+ /* Copy across relevant fields */
+ if (dmt->dev_name && !dm_task_set_name(task, dmt->dev_name)) {
+ dm_task_destroy(task);
+ return 0;
+ }
+
+ task->read_only = dmt->read_only;
+ task->head = dmt->head;
+ task->tail = dmt->tail;
+
+ r = dm_task_run(task);
+
+ task->head = NULL;
+ task->tail = NULL;
+ dm_task_destroy(task);
+ if (!r)
+ return r;
+
+ /* Use the original structure last so the info will be correct */
+ dmt->type = DM_DEVICE_RESUME;
+ dmt->uuid = NULL;
+ free(dmt->uuid);
+
+ r = dm_task_run(dmt);
+
+ return r;
+}
+
+int dm_task_run(struct dm_task *dmt)
+{
+ struct dm_ioctl *dmi = NULL;
+ unsigned int command;
+
+#ifdef DM_COMPAT
+ if (_dm_version == 1)
+ return _dm_task_run_v1(dmt);
+#endif
+
+ if ((unsigned) dmt->type >=
+ (sizeof(_cmd_data_v4) / sizeof(*_cmd_data_v4))) {
+ log_error("Internal error: unknown device-mapper task %d",
+ dmt->type);
+ goto bad;
+ }
+
+ command = _cmd_data_v4[dmt->type].cmd;
+
+ /* Old-style creation had a table supplied */
+ if (dmt->type == DM_DEVICE_CREATE && dmt->head)
+ return _create_and_load_v4(dmt);
+
+ if (!_open_control())
+ return 0;
+
+ dmi = _flatten(dmt);
+ if (!dmi) {
+ log_error("Couldn't create ioctl argument");
+ return 0;
+ }
+
+ if (dmt->type == DM_DEVICE_TABLE)
+ dmi->flags |= DM_STATUS_TABLE_FLAG;
+
+ dmi->flags |= DM_EXISTS_FLAG; /* FIXME */
+ log_debug("dm %s %s %s %s", _cmd_data_v4[dmt->type].name, dmi->name,
+ dmi->uuid, dmt->newname ? dmt->newname : "");
+ if (ioctl(_control_fd, command, dmi) < 0) {
+ if (errno == ENXIO && ((dmt->type == DM_DEVICE_INFO) ||
+ (dmt->type == DM_DEVICE_MKNODES))) {
+ dmi->flags &= ~DM_EXISTS_FLAG; /* FIXME */
+ goto ignore_error;
+ }
+ if (_log_suppress)
+ log_verbose("device-mapper ioctl cmd %d failed: %s",
+ _IOC_NR(command), strerror(errno));
+ else
+ log_error("device-mapper ioctl cmd %d failed: %s",
+ _IOC_NR(command), strerror(errno));
+ goto bad;
+ }
+
+ ignore_error:
+ switch (dmt->type) {
+ case DM_DEVICE_CREATE:
+ add_dev_node(dmt->dev_name, MAJOR(dmi->dev), MINOR(dmi->dev));
+ break;
+
+ case DM_DEVICE_REMOVE:
+ rm_dev_node(dmt->dev_name);
+ break;
+
+ case DM_DEVICE_RENAME:
+ rename_dev_node(dmt->dev_name, dmt->newname);
+ break;
+
+ case DM_DEVICE_MKNODES:
+ if (dmi->flags & DM_EXISTS_FLAG)
+ add_dev_node(dmt->dev_name, MAJOR(dmi->dev),
+ MINOR(dmi->dev));
+ else
+ rm_dev_node(dmt->dev_name);
+ break;
+
+ case DM_DEVICE_STATUS:
+ case DM_DEVICE_TABLE:
+ case DM_DEVICE_WAITEVENT:
+ if (!_unmarshal_status(dmt, dmi))
+ goto bad;
+ break;
+ }
+
+ dmt->dmi.v4 = dmi;
+ return 1;
+
+ bad:
+ free(dmi);
+ return 0;
+}
+
+void dm_lib_release(void)
+{
+ if (_control_fd != -1) {
+ close(_control_fd);
+ _control_fd = -1;
+ }
+ update_devs();
+}
+
+void dm_lib_exit(void)
+{
+ if (_control_fd != -1) {
+ close(_control_fd);
+ _control_fd = -1;
+ }
+ _version_ok = 1;
+ _version_checked = 0;
+}
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef _LINUX_LIBDM_COMPAT_H
+#define _LINUX_LIBDM_COMPAT_H
+
+#include <inttypes.h>
+#include <linux/dm-ioctl.h>
+#include <linux/kdev_t.h>
+#include <sys/ioctl.h>
+
+struct dm_task;
+struct dm_info;
+
+/*
+ * Old versions of structures for backwards compatibility.
+ */
+
+struct dm_ioctl_v1 {
+ uint32_t version[3]; /* in/out */
+ uint32_t data_size; /* total size of data passed in
+ * including this struct */
+
+ uint32_t data_start; /* offset to start of data
+ * relative to start of this struct */
+
+ int32_t target_count; /* in/out */
+ int32_t open_count; /* out */
+ uint32_t flags; /* in/out */
+
+ __kernel_dev_t dev; /* in/out */
+
+ char name[DM_NAME_LEN]; /* device name */
+ char uuid[DM_UUID_LEN]; /* unique identifier for
+ * the block device */
+};
+
+struct dm_target_spec_v1 {
+ int32_t status; /* used when reading from kernel only */
+ uint64_t sector_start;
+ uint32_t length;
+ uint32_t next;
+
+ char target_type[DM_MAX_TYPE_NAME];
+
+};
+
+struct dm_target_deps_v1 {
+ uint32_t count;
+
+ __kernel_dev_t dev[0]; /* out */
+};
+
+enum {
+ /* Top level cmds */
+ DM_VERSION_CMD_V1 = 0,
+ DM_REMOVE_ALL_CMD_V1,
+
+ /* device level cmds */
+ DM_DEV_CREATE_CMD_V1,
+ DM_DEV_REMOVE_CMD_V1,
+ DM_DEV_RELOAD_CMD_V1,
+ DM_DEV_RENAME_CMD_V1,
+ DM_DEV_SUSPEND_CMD_V1,
+ DM_DEV_DEPS_CMD_V1,
+ DM_DEV_STATUS_CMD_V1,
+
+ /* target level cmds */
+ DM_TARGET_STATUS_CMD_V1,
+ DM_TARGET_WAIT_CMD_V1,
+};
+
+#define DM_VERSION_V1 _IOWR(DM_IOCTL, DM_VERSION_CMD_V1, struct dm_ioctl)
+#define DM_REMOVE_ALL_V1 _IOWR(DM_IOCTL, DM_REMOVE_ALL_CMD_V1, struct dm_ioctl)
+
+#define DM_DEV_CREATE_V1 _IOWR(DM_IOCTL, DM_DEV_CREATE_CMD_V1, struct dm_ioctl)
+#define DM_DEV_REMOVE_V1 _IOWR(DM_IOCTL, DM_DEV_REMOVE_CMD_V1, struct dm_ioctl)
+#define DM_DEV_RELOAD_V1 _IOWR(DM_IOCTL, DM_DEV_RELOAD_CMD_V1, struct dm_ioctl)
+#define DM_DEV_SUSPEND_V1 _IOWR(DM_IOCTL, DM_DEV_SUSPEND_CMD_V1, struct dm_ioctl)
+#define DM_DEV_RENAME_V1 _IOWR(DM_IOCTL, DM_DEV_RENAME_CMD_V1, struct dm_ioctl)
+#define DM_DEV_DEPS_V1 _IOWR(DM_IOCTL, DM_DEV_DEPS_CMD_V1, struct dm_ioctl)
+#define DM_DEV_STATUS_V1 _IOWR(DM_IOCTL, DM_DEV_STATUS_CMD_V1, struct dm_ioctl)
+
+#define DM_TARGET_STATUS_V1 _IOWR(DM_IOCTL, DM_TARGET_STATUS_CMD_V1, struct dm_ioctl)
+#define DM_TARGET_WAIT_V1 _IOWR(DM_IOCTL, DM_TARGET_WAIT_CMD_V1, struct dm_ioctl)
+
+/* *INDENT-OFF* */
+static struct cmd_data _cmd_data_v1[] = {
+ { "create", DM_DEV_CREATE_V1, {1, 0, 0} },
+ { "reload", DM_DEV_RELOAD_V1, {1, 0, 0} },
+ { "remove", DM_DEV_REMOVE_V1, {1, 0, 0} },
+ { "remove_all", DM_REMOVE_ALL_V1, {1, 0, 0} },
+ { "suspend", DM_DEV_SUSPEND_V1, {1, 0, 0} },
+ { "resume", DM_DEV_SUSPEND_V1, {1, 0, 0} },
+ { "info", DM_DEV_STATUS_V1, {1, 0, 0} },
+ { "deps", DM_DEV_DEPS_V1, {1, 0, 0} },
+ { "rename", DM_DEV_RENAME_V1, {1, 0, 0} },
+ { "version", DM_VERSION_V1, {1, 0, 0} },
+ { "status", DM_TARGET_STATUS_V1, {1, 0, 0} },
+ { "table", DM_TARGET_STATUS_V1, {1, 0, 0} },
+ { "waitevent", DM_TARGET_WAIT_V1, {1, 0, 0} },
+ { "names", 0, {4, 0, 0} },
+ { "clear", 0, {4, 0, 0} },
+ { "mknodes", 0, {4, 0, 0} },
+};
+/* *INDENT-ON* */
+
+#endif
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef LIB_DMTARGETS_H
+#define LIB_DMTARGETS_H
+
+#include <inttypes.h>
+
+struct dm_ioctl;
+struct dm_ioctl_v1;
+
+struct target {
+ uint64_t start;
+ uint64_t length;
+ char *type;
+ char *params;
+
+ struct target *next;
+};
+
+struct dm_task {
+ int type;
+ char *dev_name;
+
+ struct target *head, *tail;
+
+ int read_only;
+ uint32_t event_nr;
+ int major;
+ int minor;
+ union {
+ struct dm_ioctl *v4;
+ struct dm_ioctl_v1 *v1;
+ } dmi;
+ char *newname;
+
+ char *uuid;
+};
+
+struct cmd_data {
+ const char *name;
+ const int cmd;
+ const int version[3];
+};
+
+int dm_check_version(void);
+
+#endif
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef LIB_DEVICE_MAPPER_H
+#define LIB_DEVICE_MAPPER_H
+
+#include <inttypes.h>
+#include <sys/types.h>
+
+#ifdef linux
+# include <linux/types.h>
+#endif
+
+/*
+ * Since it is quite laborious to build the ioctl
+ * arguments for the device-mapper people are
+ * encouraged to use this library.
+ *
+ * You will need to build a struct dm_task for
+ * each ioctl command you want to execute.
+ */
+
+typedef void (*dm_log_fn) (int level, const char *file, int line,
+ const char *f, ...);
+
+/*
+ * The library user may wish to register their own
+ * logging function, by default errors go to
+ * stderr.
+ */
+void dm_log_init(dm_log_fn fn);
+void dm_log_init_verbose(int level);
+
+enum {
+ DM_DEVICE_CREATE,
+ DM_DEVICE_RELOAD,
+ DM_DEVICE_REMOVE,
+ DM_DEVICE_REMOVE_ALL,
+
+ DM_DEVICE_SUSPEND,
+ DM_DEVICE_RESUME,
+
+ DM_DEVICE_INFO,
+ DM_DEVICE_DEPS,
+ DM_DEVICE_RENAME,
+
+ DM_DEVICE_VERSION,
+
+ DM_DEVICE_STATUS,
+ DM_DEVICE_TABLE,
+ DM_DEVICE_WAITEVENT,
+
+ DM_DEVICE_LIST,
+
+ DM_DEVICE_CLEAR,
+
+ DM_DEVICE_MKNODES
+};
+
+struct dm_task;
+
+struct dm_task *dm_task_create(int type);
+void dm_task_destroy(struct dm_task *dmt);
+
+int dm_task_set_name(struct dm_task *dmt, const char *name);
+int dm_task_set_uuid(struct dm_task *dmt, const char *uuid);
+
+/*
+ * Retrieve attributes after an info.
+ */
+struct dm_info {
+ int exists;
+ int suspended;
+ int live_table;
+ int inactive_table;
+ int32_t open_count;
+ uint32_t event_nr;
+ uint32_t major;
+ uint32_t minor; /* minor device number */
+ int read_only; /* 0:read-write; 1:read-only */
+
+ int32_t target_count;
+};
+
+struct dm_deps {
+ uint32_t count;
+ uint32_t filler;
+ uint64_t device[0];
+};
+
+struct dm_names {
+ uint64_t dev;
+ uint32_t next; /* Offset to next struct from start of this struct */
+ char name[0];
+};
+
+int dm_get_library_version(char *version, size_t size);
+int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size);
+int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
+const char *dm_task_get_name(struct dm_task *dmt);
+const char *dm_task_get_uuid(struct dm_task *dmt);
+
+struct dm_deps *dm_task_get_deps(struct dm_task *dmt);
+struct dm_names *dm_task_get_names(struct dm_task *dmt);
+
+int dm_task_set_ro(struct dm_task *dmt);
+int dm_task_set_newname(struct dm_task *dmt, const char *newname);
+int dm_task_set_minor(struct dm_task *dmt, int minor);
+int dm_task_set_major(struct dm_task *dmt, int major);
+int dm_task_set_event_nr(struct dm_task *dmt, uint32_t event_nr);
+
+/*
+ * Use these to prepare for a create or reload.
+ */
+int dm_task_add_target(struct dm_task *dmt,
+ uint64_t start,
+ uint64_t size, const char *ttype, const char *params);
+
+/*
+ * Format major/minor numbers correctly for input to driver
+ */
+int dm_format_dev(char *buf, int bufsize, uint32_t dev_major, uint32_t dev_minor);
+
+/* Use this to retrive target information returned from a STATUS call */
+void *dm_get_next_target(struct dm_task *dmt,
+ void *next, uint64_t *start, uint64_t *length,
+ char **target_type, char **params);
+
+/*
+ * Call this to actually run the ioctl.
+ */
+int dm_task_run(struct dm_task *dmt);
+
+/*
+ * Configure the device-mapper directory
+ */
+int dm_set_dev_dir(const char *dir);
+const char *dm_dir(void);
+
+/* Release library resources */
+void dm_lib_release(void);
+void dm_lib_exit(void);
+
+#endif /* LIB_DEVICE_MAPPER_H */
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#include "libdm-targets.h"
+#include "libdm-common.h"
+#include "list.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/dm-ioctl.h>
+#include <linux/kdev_t.h>
+
+#define DEV_DIR "/dev/"
+
+static char _dm_dir[PATH_MAX] = DEV_DIR DM_DIR;
+
+static int _verbose = 0;
+
+/*
+ * Library users can provide their own logging
+ * function.
+ */
+static void _default_log(int level, const char *file, int line,
+ const char *f, ...)
+{
+ va_list ap;
+
+ if (level > _LOG_WARN && !_verbose)
+ return;
+
+ va_start(ap, f);
+
+ if (level < _LOG_WARN)
+ vfprintf(stderr, f, ap);
+ else
+ vprintf(f, ap);
+
+ va_end(ap);
+
+ if (level < _LOG_WARN)
+ fprintf(stderr, "\n");
+ else
+ fprintf(stdout, "\n");
+}
+
+dm_log_fn _log = _default_log;
+
+void dm_log_init(dm_log_fn fn)
+{
+ _log = fn;
+}
+
+void dm_log_init_verbose(int level)
+{
+ _verbose = level;
+}
+
+static void _build_dev_path(char *buffer, size_t len, const char *dev_name)
+{
+ /* If there's a /, assume caller knows what they're doing */
+ if (strchr(dev_name, '/'))
+ snprintf(buffer, len, "%s", dev_name);
+ else
+ snprintf(buffer, len, "%s/%s", _dm_dir, dev_name);
+}
+
+int dm_get_library_version(char *version, size_t size)
+{
+ strncpy(version, DM_LIB_VERSION, size);
+ return 1;
+}
+
+struct dm_task *dm_task_create(int type)
+{
+ struct dm_task *dmt = malloc(sizeof(*dmt));
+
+ if (!dm_check_version())
+ return NULL;
+
+ if (!dmt) {
+ log_error("dm_task_create: malloc(%d) failed", sizeof(*dmt));
+ return NULL;
+ }
+
+ memset(dmt, 0, sizeof(*dmt));
+
+ dmt->type = type;
+ dmt->minor = -1;
+ dmt->major = -1;
+
+ return dmt;
+}
+
+int dm_task_set_name(struct dm_task *dmt, const char *name)
+{
+ char *pos;
+ char path[PATH_MAX];
+ struct stat st1, st2;
+
+ if (dmt->dev_name) {
+ free(dmt->dev_name);
+ dmt->dev_name = NULL;
+ }
+
+ /* If path was supplied, remove it if it points to the same device
+ * as its last component.
+ */
+ if ((pos = strrchr(name, '/'))) {
+ snprintf(path, sizeof(path), "%s/%s", _dm_dir, pos + 1);
+
+ if (stat(name, &st1) || stat(path, &st2) ||
+ !(st1.st_dev == st2.st_dev)) {
+ log_error("dm_task_set_name: Device %s not found",
+ name);
+ return 0;
+ }
+
+ name = pos + 1;
+ }
+
+ if (!(dmt->dev_name = strdup(name))) {
+ log_error("dm_task_set_name: strdup(%s) failed", name);
+ return 0;
+ }
+
+ return 1;
+}
+
+int dm_task_set_uuid(struct dm_task *dmt, const char *uuid)
+{
+ if (dmt->uuid) {
+ free(dmt->uuid);
+ dmt->uuid = NULL;
+ }
+
+ if (!(dmt->uuid = strdup(uuid))) {
+ log_error("dm_task_set_uuid: strdup(%s) failed", uuid);
+ return 0;
+ }
+
+ return 1;
+}
+
+int dm_task_set_major(struct dm_task *dmt, int major)
+{
+ dmt->major = major;
+ log_debug("Setting major: %d", dmt->major);
+
+ return 1;
+}
+
+int dm_task_set_minor(struct dm_task *dmt, int minor)
+{
+ dmt->minor = minor;
+ log_debug("Setting minor: %d", dmt->minor);
+
+ return 1;
+}
+
+int dm_task_add_target(struct dm_task *dmt, uint64_t start, uint64_t size,
+ const char *ttype, const char *params)
+{
+ struct target *t = create_target(start, size, ttype, params);
+
+ if (!t)
+ return 0;
+
+ if (!dmt->head)
+ dmt->head = dmt->tail = t;
+ else {
+ dmt->tail->next = t;
+ dmt->tail = t;
+ }
+
+ return 1;
+}
+
+static int _add_dev_node(const char *dev_name, uint32_t major, uint32_t minor)
+{
+ char path[PATH_MAX];
+ struct stat info;
+ dev_t dev = MKDEV(major, minor);
+
+ _build_dev_path(path, sizeof(path), dev_name);
+
+ if (stat(path, &info) >= 0) {
+ if (!S_ISBLK(info.st_mode)) {
+ log_error("A non-block device file at '%s' "
+ "is already present", path);
+ return 0;
+ }
+
+ if (info.st_rdev == dev)
+ return 1;
+
+ if (unlink(path) < 0) {
+ log_error("Unable to unlink device node for '%s'",
+ dev_name);
+ return 0;
+ }
+ }
+
+ if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP, dev) < 0) {
+ log_error("Unable to make device node for '%s'", dev_name);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int _rename_dev_node(const char *old_name, const char *new_name)
+{
+ char oldpath[PATH_MAX];
+ char newpath[PATH_MAX];
+ struct stat info;
+
+ _build_dev_path(oldpath, sizeof(oldpath), old_name);
+ _build_dev_path(newpath, sizeof(newpath), new_name);
+
+ if (stat(newpath, &info) == 0) {
+ if (!S_ISBLK(info.st_mode)) {
+ log_error("A non-block device file at '%s' "
+ "is already present", newpath);
+ return 0;
+ }
+
+ if (unlink(newpath) < 0) {
+ if (errno == EPERM) {
+ /* devfs, entry has already been renamed */
+ return 1;
+ }
+ log_error("Unable to unlink device node for '%s'",
+ new_name);
+ return 0;
+ }
+ }
+
+ if (rename(oldpath, newpath) < 0) {
+ log_error("Unable to rename device node from '%s' to '%s'",
+ old_name, new_name);
+ return 0;
+ }
+
+ return 1;
+}
+
+static int _rm_dev_node(const char *dev_name)
+{
+ char path[PATH_MAX];
+ struct stat info;
+
+ _build_dev_path(path, sizeof(path), dev_name);
+
+ if (stat(path, &info) < 0)
+ return 1;
+
+ if (unlink(path) < 0) {
+ log_error("Unable to unlink device node for '%s'", dev_name);
+ return 0;
+ }
+
+ return 1;
+}
+
+typedef enum {
+ NODE_ADD,
+ NODE_DEL,
+ NODE_RENAME
+} node_op_t;
+
+static int _do_node_op(node_op_t type, const char *dev_name, uint32_t major,
+ uint32_t minor, const char *old_name)
+{
+ switch (type) {
+ case NODE_ADD:
+ return _add_dev_node(dev_name, major, minor);
+ case NODE_DEL:
+ return _rm_dev_node(dev_name);
+ case NODE_RENAME:
+ return _rename_dev_node(old_name, dev_name);
+ }
+
+ return 1;
+}
+
+static LIST_INIT(_node_ops);
+
+struct node_op_parms {
+ struct list list;
+ node_op_t type;
+ char *dev_name;
+ uint32_t major;
+ uint32_t minor;
+ char *old_name;
+ char names[0];
+};
+
+static void _store_str(char **pos, char **ptr, const char *str)
+{
+ strcpy(*pos, str);
+ *ptr = *pos;
+ *pos += strlen(*ptr) + 1;
+}
+
+static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
+ uint32_t minor, const char *old_name)
+{
+ struct node_op_parms *nop;
+ size_t len = strlen(dev_name) + strlen(old_name) + 2;
+ char *pos;
+
+ if (!(nop = malloc(sizeof(*nop) + len))) {
+ log_error("Insufficient memory to stack mknod operation");
+ return 0;
+ }
+
+ pos = nop->names;
+ nop->type = type;
+ nop->major = major;
+ nop->minor = minor;
+
+ _store_str(&pos, &nop->dev_name, dev_name);
+ _store_str(&pos, &nop->old_name, old_name);
+
+ list_add(&_node_ops, &nop->list);
+
+ return 1;
+}
+
+static void _pop_node_ops(void)
+{
+ struct list *noph, *nopht;
+ struct node_op_parms *nop;
+
+ list_iterate_safe(noph, nopht, &_node_ops) {
+ nop = list_item(noph, struct node_op_parms);
+ _do_node_op(nop->type, nop->dev_name, nop->major, nop->minor,
+ nop->old_name);
+ list_del(&nop->list);
+ free(nop);
+ }
+}
+
+int add_dev_node(const char *dev_name, uint32_t major, uint32_t minor)
+{
+ return _stack_node_op(NODE_ADD, dev_name, major, minor, "");
+}
+
+int rename_dev_node(const char *old_name, const char *new_name)
+{
+ return _stack_node_op(NODE_RENAME, new_name, 0, 0, old_name);
+}
+
+int rm_dev_node(const char *dev_name)
+{
+ return _stack_node_op(NODE_DEL, dev_name, 0, 0, "");
+}
+
+void update_devs(void)
+{
+ _pop_node_ops();
+}
+
+int dm_set_dev_dir(const char *dir)
+{
+ snprintf(_dm_dir, sizeof(_dm_dir), "%s%s", dir, DM_DIR);
+ return 1;
+}
+
+const char *dm_dir(void)
+{
+ return _dm_dir;
+}
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software (UK) Limited.
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef LIB_DMCOMMON_H
+#define LIB_DMCOMMON_H
+
+#include "libdevmapper.h"
+
+#define _LOG_DEBUG 7
+#define _LOG_INFO 6
+#define _LOG_NOTICE 5
+#define _LOG_WARN 4
+#define _LOG_ERR 3
+#define _LOG_FATAL 2
+
+extern dm_log_fn _log;
+
+#define log_error(msg, x...) _log(_LOG_ERR, __FILE__, __LINE__, msg, ## x)
+#define log_print(msg, x...) _log(_LOG_WARN, __FILE__, __LINE__, msg, ## x)
+#define log_verbose(msg, x...) _log(_LOG_NOTICE, __FILE__, __LINE__, msg, ## x)
+#define log_very_verbose(msg, x...) _log(_LOG_INFO, __FILE__, __LINE__, msg, ## x)
+#define log_debug(msg, x...) _log(_LOG_DEBUG, __FILE__, __LINE__, msg, ## x)
+
+struct target *create_target(uint64_t start,
+ uint64_t len,
+ const char *type, const char *params);
+
+int add_dev_node(const char *dev_name, uint32_t minor, uint32_t major);
+int rm_dev_node(const char *dev_name);
+int rename_dev_node(const char *old_name, const char *new_name);
+void update_devs(void);
+
+#define DM_LIB_VERSION "1.00.07-ioctl (2003-11-21)"
+
+#endif
--- /dev/null
+/*
+ * Copyright (C) 2001 Sistina Software
+ *
+ * This file is released under the LGPL.
+ */
+
+#ifndef _LVM_LIST_H
+#define _LVM_LIST_H
+
+#include <assert.h>
+
+struct list {
+ struct list *n, *p;
+};
+
+#define LIST_INIT(name) struct list name = { &(name), &(name) }
+
+static inline void list_init(struct list *head)
+{
+ head->n = head->p = head;
+}
+
+static inline void list_add(struct list *head, struct list *elem)
+{
+ assert(head->n);
+
+ elem->n = head;
+ elem->p = head->p;
+
+ head->p->n = elem;
+ head->p = elem;
+}
+
+static inline void list_add_h(struct list *head, struct list *elem)
+{
+ assert(head->n);
+
+ elem->n = head->n;
+ elem->p = head;
+
+ head->n->p = elem;
+ head->n = elem;
+}
+
+static inline void list_del(struct list *elem)
+{
+ elem->n->p = elem->p;
+ elem->p->n = elem->n;
+}
+
+static inline int list_empty(struct list *head)
+{
+ return head->n == head;
+}
+
+static inline int list_end(struct list *head, struct list *elem)
+{
+ return elem->n == head;
+}
+
+static inline struct list *list_next(struct list *head, struct list *elem)
+{
+ return (list_end(head, elem) ? NULL : elem->n);
+}
+
+#define list_iterate(v, head) \
+ for (v = (head)->n; v != head; v = v->n)
+
+#define list_uniterate(v, head, start) \
+ for (v = (start)->p; v != head; v = v->p)
+
+#define list_iterate_safe(v, t, head) \
+ for (v = (head)->n, t = v->n; v != head; v = t, t = v->n)
+
+static inline unsigned int list_size(const struct list *head)
+{
+ unsigned int s = 0;
+ const struct list *v;
+
+ list_iterate(v, head)
+ s++;
+
+ return s;
+}
+
+#define list_item(v, t) \
+ ((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->list))
+
+#define list_struct_base(v, t, h) \
+ ((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->h))
+
+/* Given a known element in a known structure, locate another */
+#define struct_field(v, t, e, f) \
+ (((t *)((uintptr_t)(v) - (uintptr_t)&((t *) 0)->e))->f)
+
+/* Given a known element in a known structure, locate the list head */
+#define list_head(v, t, e) struct_field(v, t, e, list)
+
+#endif
--- /dev/null
+# Makefile
+#
+# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
+
+EXEC = multipath
+
+prefix =
+exec_prefix = ${prefix}
+bindir = ${exec_prefix}/sbin
+udevdir = ../../..
+klibcdir = $(udevdir)/klibc
+sysfsdir = $(udevdir)/libsysfs
+mandir = /usr/share/man/man8
+libdmdir = ../libdevmapper
+arch = i386
+klibcarch = $(klibcdir)/klibc/arch/$(arch)/include
+
+CC = gcc
+GZIP = /bin/gzip -9 -c
+
+GCCINCDIR := ${shell $(CC) -print-search-dirs | sed -ne "s/install: \(.*\)/\1include/gp"}
+KERNEL_DIR = /lib/modules/${shell uname -r}/build
+CFLAGS = -pipe -g -O2 -Wall -Wunused -Wstrict-prototypes -nostdinc \
+ -I$(klibcdir)/klibc/include -I$(klibcdir)/klibc/include/bits32 \
+ -I$(GCCINCDIR) -I$(KERNEL_DIR)/include -I$(sysfsdir) -I. -I$(klibcarch)
+
+OBJS = devinfo.o main.o
+CRT0 = $(klibcdir)/klibc/crt0.o
+LIB = $(klibcdir)/klibc/libc.a
+LIBGCC := $(shell $(CC) -print-libgcc-file-name )
+
+DMOBJS = $(libdmdir)/libdm-common.o $(libdmdir)/ioctl/libdevmapper.o
+SYSFSOBJS = $(sysfsdir)/dlist.o $(sysfsdir)/sysfs_bus.o \
+ $(sysfsdir)/sysfs_class.o $(sysfsdir)/sysfs_device.o \
+ $(sysfsdir)/sysfs_dir.o $(sysfsdir)/sysfs_driver.o \
+ $(sysfsdir)/sysfs_utils.o
+
+$(EXEC): $(OBJS)
+ $(LD) -o $(EXEC) $(CRT0) $(OBJS) $(SYSFSOBJS) $(DMOBJS) $(LIB) $(LIBGCC)
+ strip $(EXEC)
+ $(GZIP) $(EXEC).8 > $(EXEC).8.gz
+
+clean:
+ rm -f core *.o $(EXEC) *.gz
+
+install:
+ install -d $(DESTDIR)$(bindir)
+ install -m 755 $(EXEC) $(DESTDIR)$(bindir)/
+ install -d $(DESTDIR)/etc/hotplug.d/scsi/
+ install -m 755 multipath.hotplug $(DESTDIR)/etc/hotplug.d/scsi/
+ install -d $(DESTDIR)$(mandir)
+ install -m 644 multipath.8.gz $(DESTDIR)$(mandir)
+
+uninstall:
+ rm $(DESTDIR)/etc/hotplug.d/scsi/multipath.hotplug
+ rm $(DESTDIR)$(bindir)/$(EXEC)
+ rm $(DESTDIR)$(mandir)/multipath.8.gz
+
+# Code dependencies
+main.o: main.c main.h sg_include.h devinfo.h
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <sysfs/libsysfs.h>
+#include "devinfo.h"
+#include "sg_include.h"
+
+#define FILE_NAME_SIZE 255
+
+void
+basename(char * str1, char * str2)
+{
+ char *p = str1 + (strlen(str1) - 1);
+
+ while (*--p != '/')
+ continue;
+ strcpy(str2, ++p);
+}
+
+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;
+}
+
+int
+get_serial (char * str, char * devname)
+{
+ int fd;
+ int len;
+ char buff[MX_ALLOC_LEN + 1];
+
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+
+ if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
+ len = buff[3];
+ if (len > 0) {
+ memcpy(str, buff + 4, len);
+ buff[len] = '\0';
+ }
+ close(fd);
+ return 1;
+ }
+ close(fd);
+ return 0;
+}
+
+int
+get_lun_strings(char * vendor_id, char * product_id, char * rev, char * devname)
+{
+ int fd;
+ char buff[36];
+ char attr_path[FILE_NAME_SIZE];
+ char sysfs_path[FILE_NAME_SIZE];
+ char basedev[FILE_NAME_SIZE];
+
+ if (0 == sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ /* sysfs style */
+ basename(devname, basedev);
+
+ sprintf(attr_path, "%s/block/%s/device/vendor",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ vendor_id, 8)) return 0;
+
+ sprintf(attr_path, "%s/block/%s/device/model",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ product_id, 16)) return 0;
+
+ sprintf(attr_path, "%s/block/%s/device/rev",
+ sysfs_path, basedev);
+ if (0 > sysfs_read_attribute_value(attr_path,
+ rev, 4)) return 0;
+ } else {
+ /* ioctl style */
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+ if (0 != do_inq(fd, 0, 0, 0, buff, 36, 1))
+ return 0;
+ memcpy(vendor_id, &buff[8], 8);
+ memcpy(product_id, &buff[16], 16);
+ memcpy(rev, &buff[32], 4);
+ close(fd);
+ return 1;
+ }
+ return 0;
+}
+
+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';
+}
+
+/* get EVPD page 0x83 off 8 */
+/* tested ok with StorageWorks */
+int
+get_evpd_wwid(char * devname, char * wwid)
+{
+ int fd;
+ char buff[MX_ALLOC_LEN + 1];
+
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 0;
+
+ if (0 == do_inq(fd, 0, 1, 0x83, buff, MX_ALLOC_LEN, 1)) {
+ sprint_wwid(wwid, &buff[8]);
+ close(fd);
+ return 1; /* success */
+ }
+
+ close(fd);
+ return 0; /* not good */
+}
+
+long
+get_disk_size (char * devname) {
+ long size;
+ int fd;
+ char attr_path[FILE_NAME_SIZE];
+ char sysfs_path[FILE_NAME_SIZE];
+ char buff[FILE_NAME_SIZE];
+ char basedev[FILE_NAME_SIZE];
+
+ if (0 == sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ basename(devname, basedev);
+ sprintf(attr_path, "%s/block/%s/size",
+ 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(devname, O_RDONLY)) < 0)
+ return -1;
+ if(!ioctl(fd, BLKGETSIZE, &size))
+ return size;
+ }
+ return -1;
+}
+
+int
+do_tur(char *dev)
+{
+ unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
+ struct sg_io_hdr io_hdr;
+ unsigned char sense_buffer[32];
+ int fd;
+
+ fd = open(dev, O_RDONLY);
+
+ if (fd < 0)
+ return 0;
+
+ memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+ io_hdr.interface_id = 'S';
+ io_hdr.cmd_len = sizeof (turCmdBlk);
+ io_hdr.mx_sb_len = sizeof (sense_buffer);
+ io_hdr.dxfer_direction = SG_DXFER_NONE;
+ io_hdr.cmdp = turCmdBlk;
+ io_hdr.sbp = sense_buffer;
+ io_hdr.timeout = 20000;
+ io_hdr.pack_id = 0;
+
+ if (ioctl(fd, SG_IO, &io_hdr) < 0) {
+ close(fd);
+ return 0;
+ }
+
+ close(fd);
+
+ if (io_hdr.info & SG_INFO_OK_MASK)
+ return 0;
+
+ return 1;
+}
--- /dev/null
+#define INQUIRY_CMDLEN 6
+#define INQUIRY_CMD 0x12
+#define SENSE_BUFF_LEN 32
+#define DEF_TIMEOUT 60000
+#define RECOVERED_ERROR 0x01
+#define MX_ALLOC_LEN 255
+#define WWID_SIZE 33
+#define BLKGETSIZE _IO(0x12,96)
+#define TUR_CMD_LEN 6
+
+/* exerpt from "sg_err.h" */
+#define SCSI_CHECK_CONDITION 0x2
+#define SCSI_COMMAND_TERMINATED 0x22
+#define SG_ERR_DRIVER_SENSE 0x08
+
+void basename (char *, char *);
+int get_serial (char *, char *);
+int get_lun_strings (char *, char *, char *, char *);
+int get_evpd_wwid(char *, char *);
+long get_disk_size (char *);
+int do_tur (char *);
--- /dev/null
+/*
+ * Soft: multipath device mapper target autoconfig
+ *
+ * Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
+ *
+ * Author: Copyright (C) 2003 Christophe Varoqui
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <linux/kdev_t.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/ioctl.h>
+#include <dlist.h>
+#include <sysfs/libsysfs.h>
+#include "../libdevmapper/libdevmapper.h"
+#include "main.h"
+#include "devinfo.h"
+
+/* White list switch */
+static int
+get_unique_id(struct path * mypath)
+{
+ int i;
+ static struct {
+ char * vendor;
+ char * product;
+ int iopolicy;
+ int (*getuid) (char *, char *);
+ } wlist[] = {
+ {"COMPAQ ", "HSV110 (C)COMPAQ", GROUP_BY_TUR, &get_evpd_wwid},
+ {"COMPAQ ", "MSA1000 ", GROUP_BY_TUR, &get_evpd_wwid},
+ {"COMPAQ ", "MSA1000 VOLUME ", GROUP_BY_TUR, &get_evpd_wwid},
+ {"DEC ", "HSG80 ", GROUP_BY_TUR, &get_evpd_wwid},
+ {"HP ", "HSV100 ", GROUP_BY_TUR, &get_evpd_wwid},
+ {"HP ", "A6189A ", MULTIBUS, &get_evpd_wwid},
+ {"HP ", "OPEN- ", MULTIBUS, &get_evpd_wwid},
+ {"DDN ", "SAN DataDirector", MULTIBUS, &get_evpd_wwid},
+ {"FSC ", "CentricStor ", MULTIBUS, &get_evpd_wwid},
+ {"HITACHI ", "DF400 ", MULTIBUS, &get_evpd_wwid},
+ {"HITACHI ", "DF500 ", MULTIBUS, &get_evpd_wwid},
+ {"HITACHI ", "DF600 ", MULTIBUS, &get_evpd_wwid},
+ {"IBM ", "ProFibre 4000R ", MULTIBUS, &get_evpd_wwid},
+ {"SGI ", "TP9100 ", MULTIBUS, &get_evpd_wwid},
+ {"SGI ", "TP9300 ", MULTIBUS, &get_evpd_wwid},
+ {"SGI ", "TP9400 ", MULTIBUS, &get_evpd_wwid},
+ {"SGI ", "TP9500 ", MULTIBUS, &get_evpd_wwid},
+ {NULL, NULL, 0, NULL},
+ };
+
+ for (i = 0; wlist[i].vendor; i++) {
+ 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->sg_dev, mypath->wwid))
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static int
+sysfsdevice2devname (char *devname, char *device)
+{
+ char sysfs_path[FILE_NAME_SIZE];
+ char block_path[FILE_NAME_SIZE];
+ char link_path[FILE_NAME_SIZE];
+ int r;
+
+ if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ fprintf(stderr, "[device] feature available with sysfs only\n");
+ exit (1);
+ }
+
+ sprintf(link_path, "%s%s/block", sysfs_path, device);
+
+ r = sysfs_get_link(link_path, block_path, FILE_NAME_SIZE);
+
+ if (r != 0)
+ return 1;
+
+ sysfs_get_name_from_path(block_path, devname, FILE_NAME_SIZE);
+
+ return 0;
+}
+
+
+static int
+devt2devname (char *devname, int major, int minor)
+{
+ struct sysfs_directory * sdir;
+ struct sysfs_directory * devp;
+ char sysfs_path[FILE_NAME_SIZE];
+ char block_path[FILE_NAME_SIZE];
+ char attr_path[FILE_NAME_SIZE];
+ char attr_value[16];
+ char attr_ref_value[16];
+
+ if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
+ fprintf(stderr, "-D feature available with sysfs only\n");
+ exit (1);
+ }
+
+ sprintf(attr_ref_value, "%i:%i\n", major, minor);
+ sprintf(block_path, "%s/block", sysfs_path);
+ sdir = sysfs_open_directory(block_path);
+ sysfs_read_directory(sdir);
+
+ dlist_for_each_data(sdir->subdirs, devp, struct sysfs_directory) {
+ sprintf(attr_path, "%s/%s/dev", block_path, devp->name);
+ sysfs_read_attribute_value(attr_path, attr_value, 16);
+
+ if (!strcmp(attr_value, attr_ref_value)) {
+ sprintf(attr_path, "%s/%s", block_path, devp->name);
+ sysfs_get_name_from_path(attr_path, devname, FILE_NAME_SIZE);
+ break;
+ }
+ }
+
+ sysfs_close_directory(sdir);
+
+ return 0;
+}
+
+static int
+blacklist (char * dev) {
+ int i;
+ static struct {
+ char * headstr;
+ int lengh;
+ } blist[] = {
+ {"cciss", 5},
+ {"hd", 2},
+ {"md", 2},
+ {"dm", 2},
+ {"sr", 2},
+ {"scd", 3},
+ {"ram", 3},
+ {"raw", 3},
+ {NULL, 0},
+ };
+
+ for (i = 0; blist[i].lengh; i++) {
+ if (strncmp(dev, blist[i].headstr, blist[i].lengh) == 0)
+ return 1;
+ }
+ return 0;
+}
+
+static int
+devinfo (struct path *curpath)
+{
+ get_lun_strings(curpath->vendor_id,
+ curpath->product_id,
+ curpath->rev,
+ curpath->sg_dev);
+ get_serial(curpath->serial, curpath->sg_dev);
+ curpath->tur = do_tur(curpath->sg_dev);
+ if (!get_unique_id(curpath))
+ return 1;
+
+ return 0;
+}
+
+
+static int
+get_all_paths_sysfs(struct env * conf, struct path * all_paths)
+{
+ int k=0;
+ 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;
+
+ memset(empty_buff, 0, WWID_SIZE);
+ memset(refwwid, 0, WWID_SIZE);
+
+ /* if called from hotplug, only consider the paths that relate
+ to the device pointed by conf.hotplugdev */
+
+ if (strncmp("/devices", conf->hotplugdev, 8) == 0) {
+ if (sysfsdevice2devname (buff, conf->hotplugdev))
+ return 0;
+
+ sprintf(curpath.sg_dev, "/dev/%s", buff);
+
+ if (devinfo(&curpath))
+ return 0;
+
+ strcpy(refwwid, curpath.wwid);
+ memset(&curpath, 0, sizeof(path));
+ }
+
+ /* if major/minor specified on the cmd line,
+ only consider affiliated paths */
+
+ if (conf->major >= 0 && conf->minor >= 0) {
+ if (devt2devname(buff, conf->major, conf->minor))
+ return 0;
+
+ sprintf(curpath.sg_dev, "/dev/%s", buff);
+
+ if (devinfo(&curpath))
+ return 0;
+
+ strcpy(refwwid, curpath.wwid);
+ memset(&curpath, 0, sizeof(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(curpath.sg_dev, "/dev/%s", buff);
+
+ if(devinfo(&curpath)) {
+ memset(&curpath, 0, sizeof(path));
+ continue;
+ }
+
+ 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);
+ all_paths[k].iopolicy = curpath.iopolicy;
+ all_paths[k].tur = curpath.tur;
+
+ /* done with curpath, zero for reuse */
+ memset(&curpath, 0, sizeof(path));
+
+ basename(linkp->target, buff);
+ sscanf(buff, "%i:%i:%i:%i",
+ &all_paths[k].sg_id.host_no,
+ &all_paths[k].sg_id.channel,
+ &all_paths[k].sg_id.scsi_id,
+ &all_paths[k].sg_id.lun);
+ k++;
+ }
+ sysfs_close_directory(sdir);
+ return 0;
+}
+
+static int
+get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
+ struct scsi_dev * all_scsi_ids)
+{
+ int k, i, fd;
+ char buff[FILE_NAME_SIZE];
+ char file_name[FILE_NAME_SIZE];
+
+ for (k = 0; k < conf->max_devs; k++) {
+ strcpy(file_name, "/dev/sg");
+ sprintf(buff, "%d", k);
+ strncat(file_name, buff, FILE_NAME_SIZE);
+ strcpy(all_paths[k].sg_dev, file_name);
+
+ 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;
+
+ if ((fd = open(all_paths[k].sg_dev, O_RDONLY)) < 0)
+ return 0;
+
+ if (0 > ioctl(fd, SG_GET_SCSI_ID, &(all_paths[k].sg_id)))
+ printf("device %s failed on sg ioctl, skip\n",
+ file_name);
+
+ close(fd);
+
+ for (i = 0; i < conf->max_devs; i++) {
+ if ((all_paths[k].sg_id.host_no ==
+ all_scsi_ids[i].host_no)
+ && (all_paths[k].sg_id.scsi_id ==
+ (all_scsi_ids[i].scsi_id.dev_id & 0xff))
+ && (all_paths[k].sg_id.lun ==
+ ((all_scsi_ids[i].scsi_id.dev_id >> 8) & 0xff))
+ && (all_paths[k].sg_id.channel ==
+ ((all_scsi_ids[i].scsi_id.
+ dev_id >> 16) & 0xff))) {
+ strcpy(all_paths[k].dev, all_scsi_ids[i].dev);
+ break;
+ }
+ }
+ }
+ return 0;
+}
+
+static int
+get_all_scsi_ids(struct env * conf, struct scsi_dev * all_scsi_ids)
+{
+ int k, big, little, res, host_no, fd;
+ char buff[64];
+ char fname[FILE_NAME_SIZE];
+ struct scsi_idlun my_scsi_id;
+
+ for (k = 0; k < conf->max_devs; k++) {
+ strcpy(fname, "/dev/sd");
+ if (k < 26) {
+ buff[0] = 'a' + (char) k;
+ buff[1] = '\0';
+ strcat(fname, buff);
+ } else if (k <= 255) {
+ /* assumes sequence goes x,y,z,aa,ab,ac etc */
+ big = k / 26;
+ little = k - (26 * big);
+ big = big - 1;
+
+ buff[0] = 'a' + (char) big;
+ buff[1] = 'a' + (char) little;
+ buff[2] = '\0';
+ strcat(fname, buff);
+ } else
+ strcat(fname, "xxxx");
+
+ if ((fd = open(fname, O_RDONLY)) < 0) {
+ if (conf->verbose)
+ fprintf(stderr, "can't open %s. mknod ?",
+ fname);
+ continue;
+ }
+
+ res = ioctl(fd, SCSI_IOCTL_GET_IDLUN, &my_scsi_id);
+ if (res < 0) {
+ close(fd);
+ printf("Could not get scsi idlun\n");
+ continue;
+ }
+
+ res = ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &host_no);
+ if (res < 0) {
+ close(fd);
+ printf("Could not get host_no\n");
+ continue;
+ }
+
+ close(fd);
+
+ strcpy(all_scsi_ids[k].dev, fname);
+ all_scsi_ids[k].scsi_id = my_scsi_id;
+ all_scsi_ids[k].host_no = host_no;
+ }
+ return 0;
+}
+
+/* print_path style */
+#define ALL 0
+#define NOWWID 1
+
+static void
+print_path(struct path * all_paths, int k, int style)
+{
+ if (style != NOWWID)
+ printf("%s ", all_paths[k].wwid);
+ else
+ printf(" \\_");
+ printf("(%i %i %i %i) ",
+ all_paths[k].sg_id.host_no,
+ all_paths[k].sg_id.channel,
+ all_paths[k].sg_id.scsi_id, all_paths[k].sg_id.lun);
+ if(0 != strcmp(all_paths[k].sg_dev, all_paths[k].dev))
+ printf("%s ", all_paths[k].sg_dev);
+ printf("%s ", all_paths[k].dev);
+ printf("[%.16s]\n", all_paths[k].product_id);
+}
+
+static void
+print_all_path(struct env * conf, struct path * all_paths)
+{
+ int k;
+ char empty_buff[WWID_SIZE];
+
+ memset(empty_buff, 0, WWID_SIZE);
+ for (k = 0; k < conf->max_devs; k++) {
+ if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
+ continue;
+ print_path(all_paths, k, ALL);
+ }
+}
+
+static void
+print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
+{
+ int k, i;
+
+ for (k = 0; k <= nmp; k++) {
+ printf("%s\n", mp[k].wwid);
+ for (i = 0; i <= mp[k].npaths; i++)
+ print_path(all_paths, PINDEX(k,i), NOWWID);
+ }
+}
+
+static int
+coalesce_paths(struct env * conf, struct multipath * mp,
+ struct path * all_paths)
+{
+ int k, i, nmp, np, already_done;
+ char empty_buff[WWID_SIZE];
+
+ nmp = -1;
+ already_done = 0;
+ memset(empty_buff, 0, WWID_SIZE);
+
+ for (k = 0; k < conf->max_devs - 1; k++) {
+ /* skip this path for some reason */
+
+ /* 1. if path has no unique id */
+ if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
+ continue;
+
+ /* 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;
+ }
+ if (already_done) {
+ already_done = 0;
+ continue;
+ }
+
+ /* at this point, we know we really got a new mp */
+ np = 0;
+ nmp++;
+ strcpy(mp[nmp].wwid, all_paths[k].wwid);
+ PINDEX(nmp,np) = k;
+
+ if (mp[nmp].size == 0)
+ 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)) {
+ np++;
+ PINDEX(nmp,np) = i;
+ mp[nmp].npaths = np;
+ }
+ }
+ }
+ return nmp;
+}
+
+static void
+group_by_tur(struct multipath * mp, struct path * all_paths, char * str) {
+ int left_path_count = 0;
+ int right_path_count = 0;
+ int i;
+ char left_path_buff[FILE_NAME_SIZE], right_path_buff[FILE_NAME_SIZE];
+ char * left_path_buff_p = &left_path_buff[0];
+ char * right_path_buff_p = &right_path_buff[0];
+
+ for (i = 0; i <= mp->npaths; i++) {
+ if (all_paths[mp->pindex[i]].tur) {
+ left_path_buff_p += sprintf(left_path_buff_p, " %s", all_paths[mp->pindex[i]].dev);
+ left_path_count++;
+ } else {
+ right_path_buff_p += sprintf(right_path_buff_p, " %s", all_paths[mp->pindex[i]].dev);
+ right_path_count++;
+ }
+ }
+ if (!left_path_count)
+ sprintf(str, " 1 round-robin %i 0 %s", right_path_count, right_path_buff);
+ else if (!right_path_count)
+ sprintf(str, " 1 round-robin %i 0 %s", left_path_count, left_path_buff);
+ else
+ sprintf(str, " 2 round-robin %i 0 %s round-robin %i 0 %s",
+ left_path_count, left_path_buff,
+ right_path_count, right_path_buff);
+}
+
+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;
+
+ /* 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];
+
+ path_buff_p += sprintf(path_buff_p, " %s", all_paths[mp->pindex[i]].dev);
+ bitmap[i] = 1;
+
+ 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, " round-robin %i 0%s",
+ path_count, path_buff);
+ }
+ sprintf(str, " %i%s", pg_count, pg_buff);
+ free(bitmap);
+}
+
+static int
+dm_simplecmd(int task, const char *name) {
+ int r = 0;
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(task)))
+ return 0;
+
+ if (!dm_task_set_name(dmt, name))
+ goto out;
+
+ r = dm_task_run(dmt);
+
+ out:
+ dm_task_destroy(dmt);
+ return r;
+}
+
+static int
+dm_addmap(int task, const char *name, const char *params, long size) {
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(task)))
+ return 0;
+
+ if (!dm_task_set_name(dmt, name))
+ goto addout;
+
+ if (!dm_task_add_target(dmt, 0, size, DM_TARGET, params))
+ goto addout;
+
+ if (!dm_task_run(dmt))
+ goto addout;
+
+ addout:
+ dm_task_destroy(dmt);
+ return 1;
+}
+
+static int
+setup_map(struct env * conf, struct path * all_paths,
+ struct multipath * mp, int index, int op)
+{
+ char params[255];
+ char * params_p;
+ int i, np;
+
+ /* defaults for multipath target */
+ char * dm_ps_name = "round-robin";
+ int dm_ps_nr_args = 0;
+
+ params_p = ¶ms[0];
+
+ np = 0;
+ for (i=0; i<=mp[index].npaths; i++) {
+ if (0 == all_paths[PINDEX(index,i)].sg_id.scsi_type)
+ np++;
+ }
+
+ if (np < 1)
+ return 0;
+
+ if ((all_paths[PINDEX(index,0)].iopolicy == MULTIBUS &&
+ conf->iopolicy == -1) || conf->iopolicy == MULTIBUS) {
+ params_p += sprintf(params_p, " 1 %s %i %i",
+ dm_ps_name, np, dm_ps_nr_args);
+
+ for (i=0; i<=mp[index].npaths; i++) {
+ if (0 != all_paths[PINDEX(index,i)].sg_id.scsi_type)
+ continue;
+ params_p += sprintf(params_p, " %s",
+ all_paths[PINDEX(index,i)].dev);
+ }
+ }
+
+ 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;
+ params_p += sprintf(params_p, " %s ",
+ dm_ps_name);
+ params_p += sprintf(params_p, "1 %i",
+ dm_ps_nr_args);
+ params_p += sprintf(params_p, " %s",
+ all_paths[PINDEX(index,i)].dev);
+ }
+ }
+
+ 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 ((all_paths[PINDEX(index,0)].iopolicy == GROUP_BY_TUR &&
+ conf->iopolicy == -1) || conf->iopolicy == GROUP_BY_TUR) {
+ group_by_tur(&mp[index], all_paths, params_p);
+ }
+
+ if (mp[index].size < 0)
+ return 0;
+
+ if (!conf->quiet) {
+ if (op == DM_DEVICE_RELOAD)
+ printf("U:");
+ if (op == DM_DEVICE_CREATE)
+ printf("N:");
+ printf("%s:0 %li %s %s\n",
+ mp[index].wwid, mp[index].size, DM_TARGET, params);
+ }
+
+ if (op == DM_DEVICE_RELOAD)
+ dm_simplecmd(DM_DEVICE_SUSPEND, mp[index].wwid);
+
+ dm_addmap(op, mp[index].wwid, params, mp[index].size);
+
+ if (op == DM_DEVICE_RELOAD)
+ dm_simplecmd(DM_DEVICE_RESUME, mp[index].wwid);
+
+ return 1;
+}
+
+static int
+map_present(char * str)
+{
+ int r = 0;
+ struct dm_task *dmt;
+ struct dm_names *names;
+ unsigned next = 0;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+ return 0;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!(names = dm_task_get_names(dmt)))
+ goto out;
+
+ if (!names->dev) {
+ goto out;
+ }
+
+ do {
+ if (0 == strcmp(names->name, str))
+ r = 1;
+ next = names->next;
+ names = (void *) names + next;
+ } while (next);
+
+ out:
+ dm_task_destroy(dmt);
+ return r;
+}
+
+static void
+signal_daemon (void)
+{
+ FILE *file;
+ pid_t pid;
+ char *buf;
+
+ buf = malloc (8);
+
+ file = fopen (PIDFILE, "r");
+
+ if (!file) {
+ fprintf(stderr, "cannot signal daemon, pidfile not found\n");
+ return;
+ }
+
+ buf = fgets (buf, 8, file);
+ fclose (file);
+
+ pid = (pid_t) atol (buf);
+ free (buf);
+
+ kill(pid, SIGHUP);
+}
+
+static int
+filepresent(char * run) {
+ struct stat buf;
+
+ if(!stat(run, &buf))
+ return 1;
+ return 0;
+}
+
+static void
+usage(char * progname)
+{
+ fprintf(stderr, VERSION_STRING);
+ fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]\n",
+ progname);
+ fprintf(stderr, " [-p failover|multibus|group_by_serial]\n" \
+ " [device]\n" \
+ "\n" \
+ "\t-v\t\tverbose, print all paths and multipaths\n" \
+ "\t-q\t\tquiet, no output at all\n" \
+ "\t-d\t\tdry run, do not create or update devmaps\n" \
+ "\t-m max_devs\tscan {max_devs} devices at most\n" \
+ "\n" \
+ "\t-p policy\tforce maps to specified policy :\n" \
+ "\t failover\t\t- 1 path per priority group\n" \
+ "\t multibus\t\t- all paths in 1 priority group\n" \
+ "\t group_by_serial\t- 1 priority group per serial\n" \
+ "\t group_by_tur\t\t- 1 priority group per TUR state\n" \
+ "\n" \
+ "\t-D maj min\tlimit scope to the device's multipath\n" \
+ "\t\t\t(major minor device reference)\n"
+ "\tdevice\t\tlimit scope to the device's multipath\n" \
+ "\t\t\t(hotplug-style $DEVPATH reference)\n"
+ );
+ exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+ struct multipath * mp;
+ struct path * all_paths;
+ struct scsi_dev * all_scsi_ids;
+ struct env conf;
+ int i, k, nmp;
+ int try = 0;
+
+ /* Don't run in parallel */
+ while (filepresent(RUN) && try++ < MAXTRY)
+ usleep(100000);
+
+ if (filepresent(RUN)) {
+ fprintf(stderr, "waited for to long. exiting\n");
+ exit (1);
+ }
+
+ /* Our turn */
+ if (!open(RUN, O_CREAT)) {
+ fprintf(stderr, "can't create runfile\n");
+ exit (1);
+ }
+
+ /* Default behaviour */
+ conf.max_devs = MAX_DEVS;
+ 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.iopolicy = -1; /* Apply the defaults in get_unique_id() */
+ conf.major = -1;
+ conf.minor = -1;
+
+ for (i = 1; i < argc; ++i) {
+ if (0 == strcmp("-v", argv[i])) {
+ if (conf.quiet == 1)
+ usage(argv[0]);
+ conf.verbose = 1;
+ } else if (0 == strcmp("-m", argv[i])) {
+ conf.max_devs = atoi(argv[++i]);
+ if (conf.max_devs < 2)
+ usage(argv[0]);
+ } else if (0 == strcmp("-D", argv[i])) {
+ conf.major = atoi(argv[++i]);
+ conf.minor = atoi(argv[++i]);
+ } else if (0 == strcmp("-q", argv[i])) {
+ if (conf.verbose == 1)
+ usage(argv[0]);
+ conf.quiet = 1;
+ } else if (0 == strcmp("-d", argv[i]))
+ conf.dry_run = 1;
+ 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;
+ if (!strcmp(argv[i], "group_by_tur"))
+ conf.iopolicy = GROUP_BY_TUR;
+ } else if (*argv[i] == '-') {
+ fprintf(stderr, "Unknown switch: %s\n", argv[i]);
+ usage(argv[0]);
+ } else
+ strncpy(conf.hotplugdev, argv[i], FILE_NAME_SIZE);
+ }
+
+ /* 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)
+ exit(1);
+
+ 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 {
+ get_all_paths_sysfs(&conf, all_paths);
+ }
+
+ nmp = coalesce_paths(&conf, mp, all_paths);
+
+ if (conf.verbose) {
+ print_all_path(&conf, all_paths);
+ fprintf(stdout, "\n");
+ print_all_mp(all_paths, mp, nmp);
+ fprintf(stdout, "\n");
+ }
+
+ if (conf.dry_run)
+ exit(0);
+
+ for (k=0; k<=nmp; k++) {
+ if (map_present(mp[k].wwid)) {
+ setup_map(&conf, all_paths, mp, k, DM_DEVICE_RELOAD);
+ } else {
+ setup_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);
+ }
+ }
+
+ /* signal multipathd that new devmaps may have come up */
+ signal_daemon();
+
+ /* free allocs */
+ free(mp);
+ free(all_paths);
+ free(all_scsi_ids);
+
+ /* release runfile */
+ unlink(RUN);
+
+ exit(0);
+}
--- /dev/null
+/*
+ * Soft: Description here...
+ *
+ * Version: $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
+ *
+ * Author: Copyright (C) 2003 Christophe Varoqui
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _MAIN_H
+#define _MAIN_H
+
+/* local includes */
+#include "sg_include.h"
+
+/* exerpt from "sg_err.h" */
+#define SCSI_CHECK_CONDITION 0x2
+#define SCSI_COMMAND_TERMINATED 0x22
+#define SG_ERR_DRIVER_SENSE 0x08
+
+/* exerpt from "scsi.h" */
+#define SCSI_IOCTL_GET_IDLUN 0x5382
+#define SCSI_IOCTL_GET_BUS_NUMBER 0x5386
+
+/* global defs */
+#define WWID_SIZE 33
+#define SERIAL_SIZE 14
+#define MAX_DEVS 128
+#define MAX_MP MAX_DEVS / 2
+#define MAX_MP_PATHS MAX_DEVS / 4
+#define FILE_NAME_SIZE 256
+#define DEF_TIMEOUT 60000
+#define EBUFF_SZ 256
+#define TUR_CMD_LEN 6
+#define DM_TARGET "multipath"
+#define PIDFILE "/var/run/multipathd.pid"
+#define RUN "/var/run/multipath.run"
+#define MAXTRY 50
+
+/* Storage controlers cpabilities */
+#define FAILOVER 0
+#define MULTIBUS 1
+#define GROUP_BY_SERIAL 2
+#define GROUP_BY_TUR 4
+
+#define PINDEX(x,y) mp[(x)].pindex[(y)]
+
+/* global types */
+struct scsi_idlun {
+ int dev_id;
+ int host_unique_id;
+ int host_no;
+};
+
+struct sg_id {
+ int host_no;
+ int channel;
+ int scsi_id;
+ int lun;
+ int scsi_type;
+ short h_cmd_per_lun;
+ short d_queue_depth;
+ int unused1;
+ int unused2;
+};
+
+struct scsi_dev {
+ char dev[FILE_NAME_SIZE];
+ struct scsi_idlun scsi_id;
+ int host_no;
+};
+
+struct path {
+ char dev[FILE_NAME_SIZE];
+ char sg_dev[FILE_NAME_SIZE];
+ struct scsi_idlun scsi_id;
+ struct sg_id sg_id;
+ char wwid[WWID_SIZE];
+ char vendor_id[8];
+ char product_id[16];
+ char rev[4];
+ char serial[SERIAL_SIZE];
+ int iopolicy;
+ int tur;
+};
+
+struct multipath {
+ char wwid[WWID_SIZE];
+ int npaths;
+ long size;
+ int pindex[MAX_MP_PATHS];
+};
+
+struct env {
+ int max_devs;
+ int verbose;
+ int quiet;
+ int dry_run;
+ int iopolicy;
+ int with_sysfs;
+ int major;
+ int minor;
+ char sysfs_path[FILE_NAME_SIZE];
+ char hotplugdev[FILE_NAME_SIZE];
+};
+
+/* Build version */
+#define PROG "multipath"
+
+#define VERSION_CODE 0x000012
+#define DATE_CODE 0x021504
+
+#define MULTIPATH_VERSION(version) \
+ (version >> 16) & 0xFF, \
+ (version >> 8) & 0xFF, \
+ version & 0xFF
+
+#define VERSION_STRING PROG" v%d.%d.%d (%.2d/%.2d, 20%.2d)\n", \
+ MULTIPATH_VERSION(VERSION_CODE), \
+ MULTIPATH_VERSION(DATE_CODE)
+
+#endif
--- /dev/null
+.TH MULTIPATH 8 "February 2004" "" "Linux Administrator's Manual"
+.SH NAME
+multipath \- Device mapper target autoconfig
+.SH SYNOPSIS
+.B multipath
+.RB [\| \-v | \-q \|]
+.RB [\| \-d \|]
+.RB [\| \-i\ \c
+.IR int \|]
+.RB [\| \-m\ \c
+.IR max_devs \|]
+.RB [\| \-p\ \c
+.BR failover | multibus | group_by_serial \|]
+.RB [\| device \|]
+.SH DESCRIPTION
+.B multipath
+is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them.
+.SH OPTIONS
+.TP
+.B \-v
+verbose, print all paths and multipaths
+.TP
+.B \-q
+quiet, no output at all
+.TP
+.B \-d
+dry run, do not create or update devmaps
+.TP
+.BI \-i " int"
+multipath target param: polling interval
+.TP
+.BI \-m " max_devs"
+scan
+.I max_devs
+devices at most
+.TP
+.BI \-D " major minor"
+update only the devmap the path pointed by
+.I major minor
+is in
+.TP
+.BI \-p " policy"
+force maps to specified policy:
+.RS 1.2i
+.TP 1.2i
+.B failover
+1 path per priority group
+.TP
+.B multibus
+all paths in 1 priority group
+.TP
+.B group_by_serial
+1 priority group per serial
+.RE
+.TP
+.BI device
+update only the devmap the path pointed by
+.I device
+is in
+.SH "SEE ALSO"
+.BR udev (8),
+.BR dmsetup (8)
+.BR hotplug (8)
+.SH AUTHORS
+.B multipath
+was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
--- /dev/null
+#!/bin/sh
+. /etc/hotplug/hotplug.functions
+
+# wait for sysfs
+sleep 1
+
+mesg `/sbin/multipath $DEVPATH`
--- /dev/null
+#ifndef SG_ERR_H
+#define SG_ERR_H
+
+/* Feel free to copy and modify this GPL-ed code into your applications. */
+
+/* Version 0.90 (20030519)
+*/
+
+
+/* Some of the following error/status codes are exchanged between the
+ various layers of the SCSI sub-system in Linux and should never
+ reach the user. They are placed here for completeness. What appears
+ here is copied from drivers/scsi/scsi.h which is not visible in
+ the user space. */
+
+#ifndef SCSI_CHECK_CONDITION
+/* Following are the "true" SCSI status codes. Linux has traditionally
+ used a 1 bit right and masked version of these. So now CHECK_CONDITION
+ and friends (in <scsi/scsi.h>) are deprecated. */
+#define SCSI_CHECK_CONDITION 0x2
+#define SCSI_CONDITION_MET 0x4
+#define SCSI_BUSY 0x8
+#define SCSI_IMMEDIATE 0x10
+#define SCSI_IMMEDIATE_CONDITION_MET 0x14
+#define SCSI_RESERVATION_CONFLICT 0x18
+#define SCSI_COMMAND_TERMINATED 0x22
+#define SCSI_TASK_SET_FULL 0x28
+#define SCSI_ACA_ACTIVE 0x30
+#define SCSI_TASK_ABORTED 0x40
+#endif
+
+/* The following are 'host_status' codes */
+#ifndef DID_OK
+#define DID_OK 0x00
+#endif
+#ifndef DID_NO_CONNECT
+#define DID_NO_CONNECT 0x01 /* Unable to connect before timeout */
+#define DID_BUS_BUSY 0x02 /* Bus remain busy until timeout */
+#define DID_TIME_OUT 0x03 /* Timed out for some other reason */
+#define DID_BAD_TARGET 0x04 /* Bad target (id?) */
+#define DID_ABORT 0x05 /* Told to abort for some other reason */
+#define DID_PARITY 0x06 /* Parity error (on SCSI bus) */
+#define DID_ERROR 0x07 /* Internal error */
+#define DID_RESET 0x08 /* Reset by somebody */
+#define DID_BAD_INTR 0x09 /* Received an unexpected interrupt */
+#define DID_PASSTHROUGH 0x0a /* Force command past mid-level */
+#define DID_SOFT_ERROR 0x0b /* The low-level driver wants a retry */
+#endif
+
+/* These defines are to isolate applictaions from kernel define changes */
+#define SG_ERR_DID_OK DID_OK
+#define SG_ERR_DID_NO_CONNECT DID_NO_CONNECT
+#define SG_ERR_DID_BUS_BUSY DID_BUS_BUSY
+#define SG_ERR_DID_TIME_OUT DID_TIME_OUT
+#define SG_ERR_DID_BAD_TARGET DID_BAD_TARGET
+#define SG_ERR_DID_ABORT DID_ABORT
+#define SG_ERR_DID_PARITY DID_PARITY
+#define SG_ERR_DID_ERROR DID_ERROR
+#define SG_ERR_DID_RESET DID_RESET
+#define SG_ERR_DID_BAD_INTR DID_BAD_INTR
+#define SG_ERR_DID_PASSTHROUGH DID_PASSTHROUGH
+#define SG_ERR_DID_SOFT_ERROR DID_SOFT_ERROR
+
+/* The following are 'driver_status' codes */
+#ifndef DRIVER_OK
+#define DRIVER_OK 0x00
+#endif
+#ifndef DRIVER_BUSY
+#define DRIVER_BUSY 0x01
+#define DRIVER_SOFT 0x02
+#define DRIVER_MEDIA 0x03
+#define DRIVER_ERROR 0x04
+#define DRIVER_INVALID 0x05
+#define DRIVER_TIMEOUT 0x06
+#define DRIVER_HARD 0x07
+#define DRIVER_SENSE 0x08 /* Sense_buffer has been set */
+
+/* Following "suggests" are "or-ed" with one of previous 8 entries */
+#define SUGGEST_RETRY 0x10
+#define SUGGEST_ABORT 0x20
+#define SUGGEST_REMAP 0x30
+#define SUGGEST_DIE 0x40
+#define SUGGEST_SENSE 0x80
+#define SUGGEST_IS_OK 0xff
+#endif
+#ifndef DRIVER_MASK
+#define DRIVER_MASK 0x0f
+#endif
+#ifndef SUGGEST_MASK
+#define SUGGEST_MASK 0xf0
+#endif
+
+/* These defines are to isolate applictaions from kernel define changes */
+#define SG_ERR_DRIVER_OK DRIVER_OK
+#define SG_ERR_DRIVER_BUSY DRIVER_BUSY
+#define SG_ERR_DRIVER_SOFT DRIVER_SOFT
+#define SG_ERR_DRIVER_MEDIA DRIVER_MEDIA
+#define SG_ERR_DRIVER_ERROR DRIVER_ERROR
+#define SG_ERR_DRIVER_INVALID DRIVER_INVALID
+#define SG_ERR_DRIVER_TIMEOUT DRIVER_TIMEOUT
+#define SG_ERR_DRIVER_HARD DRIVER_HARD
+#define SG_ERR_DRIVER_SENSE DRIVER_SENSE
+#define SG_ERR_SUGGEST_RETRY SUGGEST_RETRY
+#define SG_ERR_SUGGEST_ABORT SUGGEST_ABORT
+#define SG_ERR_SUGGEST_REMAP SUGGEST_REMAP
+#define SG_ERR_SUGGEST_DIE SUGGEST_DIE
+#define SG_ERR_SUGGEST_SENSE SUGGEST_SENSE
+#define SG_ERR_SUGGEST_IS_OK SUGGEST_IS_OK
+#define SG_ERR_DRIVER_MASK DRIVER_MASK
+#define SG_ERR_SUGGEST_MASK SUGGEST_MASK
+
+
+
+/* The following "print" functions send ACSII to stdout */
+extern void sg_print_command(const unsigned char * command);
+extern void sg_print_sense(const char * leadin,
+ const unsigned char * sense_buffer, int sb_len);
+extern void sg_print_status(int masked_status);
+extern void sg_print_scsi_status(int scsi_status);
+extern void sg_print_host_status(int host_status);
+extern void sg_print_driver_status(int driver_status);
+
+/* sg_chk_n_print() returns 1 quietly if there are no errors/warnings
+ else it prints to standard output and returns 0. */
+extern int sg_chk_n_print(const char * leadin, int masked_status,
+ int host_status, int driver_status,
+ const unsigned char * sense_buffer, int sb_len);
+
+/* The following function declaration is for the sg version 3 driver.
+ Only version 3 sg_err.c defines it. */
+struct sg_io_hdr;
+extern int sg_chk_n_print3(const char * leadin, struct sg_io_hdr * hp);
+
+
+/* The following "category" function returns one of the following */
+#define SG_ERR_CAT_CLEAN 0 /* No errors or other information */
+#define SG_ERR_CAT_MEDIA_CHANGED 1 /* interpreted from sense buffer */
+#define SG_ERR_CAT_RESET 2 /* interpreted from sense buffer */
+#define SG_ERR_CAT_TIMEOUT 3
+#define SG_ERR_CAT_RECOVERED 4 /* Successful command after recovered err */
+#define SG_ERR_CAT_SENSE 98 /* Something else is in the sense buffer */
+#define SG_ERR_CAT_OTHER 99 /* Some other error/warning has occurred */
+
+extern int sg_err_category(int masked_status, int host_status,
+ int driver_status, const unsigned char * sense_buffer,
+ int sb_len);
+
+extern int sg_err_category_new(int scsi_status, int host_status,
+ int driver_status, const unsigned char * sense_buffer,
+ int sb_len);
+
+/* The following function declaration is for the sg version 3 driver.
+ Only version 3 sg_err.c defines it. */
+extern int sg_err_category3(struct sg_io_hdr * hp);
+
+/* Returns length of SCSI command given the opcode (first byte) */
+extern int sg_get_command_size(unsigned char opcode);
+
+extern void sg_get_command_name(unsigned char opcode, int buff_len,
+ char * buff);
+
+#endif
--- /dev/null
+#ifdef SG_KERNEL_INCLUDES
+ #define __user
+ typedef unsigned char u8;
+ #include "/usr/src/linux/include/scsi/sg.h"
+ #include "/usr/src/linux/include/scsi/scsi.h"
+#else
+ #ifdef SG_TRICK_GNU_INCLUDES
+ #include <linux/../scsi/sg.h>
+ #include <linux/../scsi/scsi.h>
+ #else
+ #include <scsi/sg.h>
+ #endif
+#endif
+
+/*
+ Getting the correct include files for the sg interface can be an ordeal.
+ In a perfect world, one would just write:
+ #include <scsi/sg.h>
+ #include <scsi/scsi.h>
+ This would include the files found in the /usr/include/scsi directory.
+ Those files are maintained with the GNU library which may or may not
+ agree with the kernel and version of sg driver that is running. Any
+ many cases this will not matter. However in some it might, for example
+ glibc 2.1's include files match the sg driver found in the lk 2.2
+ series. Hence if glibc 2.1 is used with lk 2.4 then the additional
+ sg v3 interface will not be visible.
+ If this is a problem then defining SG_KERNEL_INCLUDES will access the
+ kernel supplied header files (assuming they are in the normal place).
+ The GNU library maintainers and various kernel people don't like
+ this approach (but it does work).
+ The technique selected by defining SG_TRICK_GNU_INCLUDES worked (and
+ was used) prior to glibc 2.2 . Prior to that version /usr/include/linux
+ was a symbolic link to /usr/src/linux/include/linux .
+
+ There are other approaches if this include "mixup" causes pain. These
+ would involve include files being copied or symbolic links being
+ introduced.
+
+ Sorry about the inconvenience. Typically neither SG_KERNEL_INCLUDES
+ nor SG_TRICK_GNU_INCLUDES is defined.
+
+ dpg 20010415, 20030522
+*/
--- /dev/null
+static int
+get_serial (int fd, char * str)
+{
+ char buff[MX_ALLOC_LEN + 1];
+ int len;
+
+ if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
+ len = buff[3];
+ if (len > 0) {
+ memcpy(str, buff + 4, len);
+ buff[len] = '\0';
+ }
+ return 1;
+ }
+ return 0;
+}
+
+static int
+do_tur(int fd)
+{
+ unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
+ struct sg_io_hdr io_hdr;
+ unsigned char sense_buffer[32];
+
+ memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+ io_hdr.interface_id = 'S';
+ io_hdr.cmd_len = sizeof (turCmdBlk);
+ io_hdr.mx_sb_len = sizeof (sense_buffer);
+ io_hdr.dxfer_direction = SG_DXFER_NONE;
+ io_hdr.cmdp = turCmdBlk;
+ io_hdr.sbp = sense_buffer;
+ io_hdr.timeout = 20000;
+ io_hdr.pack_id = 0;
+ if (ioctl(fd, SG_IO, &io_hdr) < 0) {
+ close(fd);
+ return 0;
+ }
+ if (io_hdr.info & SG_INFO_OK_MASK) {
+ return 0;
+ }
+ return 1;
+}
+
+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;
+
+}
--- /dev/null
+EXEC = multipathd
+
+CC = gcc
+GZIP = /bin/gzip -9 -c
+
+bindir = /usr/bin
+mandir = /usr/share/man/man8
+rcdir = /etc/init.d
+
+CFLAGS = -pipe -g -O2 -Wall -Wunused -Wstrict-prototypes -DDEBUG=1
+LDFLAGS = -lpthread -ldevmapper -lsysfs
+
+OBJS = main.o devinfo.o checkers.o
+
+$(EXEC): $(OBJS)
+ $(CC) $(LDFLAGS) $(OBJS) -o $(EXEC)
+ strip $(EXEC)
+
+install:
+ install -d $(bindir)
+ install -m 755 $(EXEC) $(bindir)
+ install -d $(rcdir)
+ install -m 755 multipathd.init $(rcdir)/$(EXEC)
+
+uninstall:
+ rm -f $(bindir)/$(EXEC)
+ rm -f $(rcdir)/$(EXEC)
+
+clean:
+ rm -f core *.o $(EXEC) *.gz
+
--- /dev/null
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+
+#include "sg_include.h"
+
+#define TUR_CMD_LEN 6
+
+/*
+ * test IO functions : add yours here
+ *
+ * returns 0 : path gone valid
+ * returns 1 : path still failed
+ */
+
+int readsector0 (char *devnode)
+{
+ int fd, r;
+ char buf;
+
+ fd = open (devnode, O_RDONLY);
+ if (read (fd, &buf, 1) != 1)
+ r = 0;
+ else
+ r = 1;
+
+ close (fd);
+
+ return r;
+}
+
+int tur(char *devnode)
+{
+ unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
+ struct sg_io_hdr io_hdr;
+ unsigned char sense_buffer[32];
+ int fd;
+
+ fd = open (devnode, O_RDONLY);
+
+ memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+ io_hdr.interface_id = 'S';
+ io_hdr.cmd_len = sizeof (turCmdBlk);
+ io_hdr.mx_sb_len = sizeof (sense_buffer);
+ io_hdr.dxfer_direction = SG_DXFER_NONE;
+ io_hdr.cmdp = turCmdBlk;
+ io_hdr.sbp = sense_buffer;
+ io_hdr.timeout = 20000;
+ io_hdr.pack_id = 0;
+ if (ioctl(fd, SG_IO, &io_hdr) < 0) {
+ close(fd);
+ return 0;
+ }
+ if (io_hdr.info & SG_INFO_OK_MASK) {
+ return 0;
+ }
+ return 1;
+}
--- /dev/null
+int readsector0 (char *);
+int tur (char *);
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include "devinfo.h"
+#include "sg_include.h"
+
+#define FILE_NAME_SIZE 255
+
+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;
+}
+
+int
+get_lun_strings(char * vendor_id, char * product_id, char * rev, char * devname)
+{
+ int fd;
+ char buff[36];
+
+ /* ioctl style */
+ if ((fd = open(devname, O_RDONLY)) < 0)
+ return 1;
+ if (0 != do_inq(fd, 0, 0, 0, buff, 36, 1))
+ return 1;
+ memcpy(vendor_id, &buff[8], 8);
+ memcpy(product_id, &buff[16], 16);
+ memcpy(rev, &buff[32], 4);
+ close(fd);
+
+ return 0;
+}
--- /dev/null
+#define INQUIRY_CMDLEN 6
+#define INQUIRY_CMD 0x12
+#define SENSE_BUFF_LEN 32
+#define DEF_TIMEOUT 60000
+#define RECOVERED_ERROR 0x01
+#define MX_ALLOC_LEN 255
+#define WWID_SIZE 33
+#define BLKGETSIZE _IO(0x12,96)
+
+/* exerpt from "sg_err.h" */
+#define SCSI_CHECK_CONDITION 0x2
+#define SCSI_COMMAND_TERMINATED 0x22
+#define SG_ERR_DRIVER_SENSE 0x08
+
+int get_lun_strings (char *, char *, char *, char *);
--- /dev/null
+#include <string.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <libdevmapper.h>
+#include <syslog.h>
+#include <signal.h>
+#include <wait.h>
+
+#include "devinfo.h"
+#include "checkers.h"
+
+#define CHECKINT 5
+#define MAXPATHS 2048
+#define FILENAMESIZE 256
+#define MAPNAMESIZE 64
+#define TARGETTYPESIZE 16
+#define PARAMSSIZE 2048
+#define MAXMAPS 512
+
+#define MULTIPATH "/sbin/multipath"
+#define PIDFILE "/var/run/multipathd.pid"
+
+#ifndef DEBUG
+#define DEBUG 1
+#endif
+#define LOG(x, y, z...) if (DEBUG >= x) syslog(x, y, ##z)
+
+struct path
+{
+ int major;
+ int minor;
+ char mapname[MAPNAMESIZE];
+ int (*checkfn) (char *);
+};
+
+struct paths
+{
+ pthread_mutex_t *lock;
+ struct path *paths_h;
+};
+
+struct event_thread
+{
+ pthread_t *thread;
+ pthread_mutex_t *waiter_lock;
+ char mapname[MAPNAMESIZE];
+};
+
+struct devmap
+{
+ char mapname[MAPNAMESIZE];
+};
+
+/* global var */
+pthread_mutex_t *event_lock;
+pthread_cond_t *event;
+
+int makenode (char *devnode, int major, int minor)
+{
+ dev_t dev;
+
+ dev = makedev (major, minor);
+ unlink (devnode);
+
+ return mknod(devnode, S_IFBLK | S_IRUSR | S_IWUSR, dev);
+}
+
+int select_checkfn(struct path *path_p)
+{
+ char devnode[FILENAMESIZE];
+ char vendor[8];
+ char product[16];
+ char rev[4];
+ int i, r;
+
+ /* default checkfn */
+ path_p->checkfn = &readsector0;
+
+ sprintf (devnode, "/tmp/.select.%i.%i", path_p->major, path_p->minor);
+
+ r = makenode (devnode, path_p->major, path_p->minor);
+
+ if (r < 0) {
+ LOG(2, "[select_checkfn] can not make node %s", devnode);
+ return r;
+ }
+
+ r = get_lun_strings(vendor, product, rev, devnode);
+
+ if (r) {
+ LOG(2, "[select_checkfn] can not get strings");
+ return r;
+ }
+
+ r = unlink (devnode);
+
+ if (r < 0) {
+ LOG(2, "[select_checkfn] can not unlink %s", devnode);
+ return r;
+ }
+
+ static struct {
+ char * vendor;
+ char * product;
+ int (*checkfn) (char *);
+ } wlist[] = {
+ {"COMPAQ ", "HSV110 (C)COMPAQ", &tur},
+ {"COMPAQ ", "MSA1000 ", &tur},
+ {"COMPAQ ", "MSA1000 VOLUME ", &tur},
+ {"DEC ", "HSG80 ", &tur},
+ {"HP ", "HSV100 ", &readsector0},
+ {NULL, NULL, NULL},
+ };
+
+ for (i = 0; wlist[i].vendor; i++) {
+ if (strncmp(vendor, wlist[i].vendor, 8) == 0 &&
+ strncmp(product, wlist[i].product, 16) == 0) {
+ path_p->checkfn = wlist[i].checkfn;
+ }
+ }
+
+ return 0;
+}
+
+int get_devmaps (struct devmap *devmaps)
+{
+ struct devmap *devmaps_p;
+ struct dm_task *dmt, *dmt1;
+ struct dm_names *names = NULL;
+ unsigned next = 0;
+ void *nexttgt;
+ int r = 0;
+ long long start, length;
+ char *target_type = NULL;
+ char *params;
+
+ memset (devmaps, 0, MAXMAPS * sizeof (struct devmap));
+
+ if (!(dmt = dm_task_create(DM_DEVICE_LIST))) {
+ r = 1;
+ goto out;
+ }
+
+ if (!dm_task_run(dmt)) {
+ r = 1;
+ goto out;
+ }
+
+ if (!(names = dm_task_get_names(dmt))) {
+ r = 1;
+ goto out;
+ }
+
+ if (!names->dev) {
+ LOG (1, "[get_devmaps] no devmap found");
+ goto out;
+ }
+
+ devmaps_p = devmaps;
+
+ do {
+ /* keep only multipath maps */
+
+ names = (void *) names + next;
+ nexttgt = NULL;
+ LOG (3, "[get_devmaps] iterate on devmap names : %s", names->name);
+
+ LOG (3, "[get_devmaps] dm_task_create(DM_DEVICE_STATUS)");
+ if (!(dmt1 = dm_task_create(DM_DEVICE_STATUS)))
+ goto out1;
+
+ LOG (3, "[get_devmaps] dm_task_set_name(dmt1, names->name)");
+ if (!dm_task_set_name(dmt1, names->name))
+ goto out1;
+
+ LOG (3, "[get_devmaps] dm_task_run(dmt1)");
+ if (!dm_task_run(dmt1))
+ goto out1;
+ LOG (3, "[get_devmaps] DM_DEVICE_STATUS ioctl done");
+ do {
+ LOG (3, "[get_devmaps] iterate on devmap's targets");
+ nexttgt = dm_get_next_target(dmt1, nexttgt,
+ &start,
+ &length,
+ &target_type,
+ ¶ms);
+
+
+ LOG (3, "[get_devmaps] test target_type existence");
+ if (!target_type)
+ goto out1;
+
+ LOG (3, "[get_devmaps] test target_type is multipath");
+ if (!strncmp (target_type, "multipath", 9)) {
+ strcpy (devmaps_p->mapname, names->name);
+ devmaps_p++;
+
+ /* test vector overflow */
+ if (devmaps_p - devmaps >= MAXMAPS * sizeof (struct devmap)) {
+ LOG (1, "[get_devmaps] devmaps overflow");
+ dm_task_destroy(dmt1);
+ r = 1;
+ goto out;
+ }
+ }
+
+ } while (nexttgt);
+
+out1:
+ dm_task_destroy(dmt1);
+ next = names->next;
+
+ } while (next);
+
+out:
+ dm_task_destroy(dmt);
+
+ LOG (3, "[get_devmaps] done");
+ return r;
+}
+
+int checkpath (struct path *path_p)
+{
+ char devnode[FILENAMESIZE];
+ int r;
+
+ LOG (2, "[checkpath] checking path %i:%i", path_p->major, path_p->minor);
+ sprintf (devnode, "/tmp/.checker.%i.%i", path_p->major, path_p->minor);
+
+ if (path_p->checkfn == NULL) {
+ LOG (1, "[checkpath] test function not set for path %i:%i",
+ path_p->major, path_p->minor);
+ return 1;
+ }
+
+ r = makenode (devnode, path_p->major, path_p->minor);
+
+ if (r < 0) {
+ LOG (2, "[checkpath] can not make node for %s", devnode);
+ return r;
+ }
+
+ r = path_p->checkfn(devnode);
+ unlink (devnode);
+
+ return r;
+}
+
+int updatepaths (struct devmap *devmaps, struct paths *failedpaths)
+{
+ struct path *path_p;
+ struct devmap *devmaps_p;
+ void *next;
+ struct dm_task *dmt;
+ long long start, length;
+ char *target_type = NULL;
+ char *params, *p1, *p2;
+ char word[6];
+ int i;
+
+ path_p = failedpaths->paths_h;
+
+ pthread_mutex_lock (failedpaths->lock);
+ memset (failedpaths->paths_h, 0, MAXPATHS * sizeof (struct path));
+
+ /* first pass */
+ /* ask DM the failed path list */
+
+ devmaps_p = devmaps;
+
+ while (*devmaps_p->mapname != 0x0) {
+ next = NULL;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_STATUS)))
+ break;
+
+ if (!dm_task_set_name(dmt, devmaps_p->mapname))
+ goto out;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ do {
+ next = dm_get_next_target(dmt, next, &start, &length,
+ &target_type, ¶ms);
+
+ /* begin ugly parser */
+ p1 = params;
+ p2 = params;
+ while (*p1) {
+ /* p2 lags at the begining of the word p1 parses */
+ while (*p1 != ' ') {
+ /* if the current word is a path */
+ if (*p1 == ':') {
+ /* p1 jumps to path state */
+ while (*p1 != 'A' && *p1 != 'F')
+ p1++;
+
+ /* store path info */
+
+ path_p->checkfn = NULL;
+
+ i = 0;
+ memset (&word, 'O', 6 * sizeof (char));
+ while (*p2 != ':') {
+ word[i++] = *p2;
+ p2++;
+ }
+ path_p->major = atoi (word);
+
+ p2++;
+ i = 0;
+ memset (&word, 'O', 6 * sizeof (char));
+ while (*p2 != ' ') {
+ word[i++] = *p2;
+ p2++;
+ }
+ path_p->minor = atoi (word);
+
+ strcpy (path_p->mapname, devmaps_p->mapname);
+
+ /*
+ * discard active paths
+ * don't trust the A status flag : double check
+ */
+ if (*p1 == 'A' &&
+ !select_checkfn (path_p) &&
+ checkpath (path_p)) {
+ LOG(2, "[updatepaths] discard %i:%i as valid path",
+ path_p->major, path_p->minor);
+ p1++;
+ memset (path_p, 0, sizeof(struct path));
+ continue;
+ }
+
+ path_p++;
+
+ /* test vector overflow */
+ if (path_p - failedpaths->paths_h >= MAXPATHS * sizeof (struct path)) {
+ LOG (1, "[updatepaths] path_h overflow");
+ pthread_mutex_unlock (failedpaths->lock);
+ return 1;
+ }
+ }
+ p1++;
+ }
+ p2 = p1;
+ p1++;
+ }
+ } while (next);
+
+out:
+ dm_task_destroy(dmt);
+ devmaps_p++;
+
+ }
+
+ pthread_mutex_unlock (failedpaths->lock);
+ return 0;
+}
+
+int geteventnr (char *name)
+{
+ struct dm_task *dmt;
+ struct dm_info info;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_INFO)))
+ return 0;
+
+ if (!dm_task_set_name(dmt, name))
+ goto out;
+
+ if (!dm_task_run(dmt))
+ goto out;
+
+ if (!dm_task_get_info(dmt, &info))
+ return 0;
+
+ if (!info.exists) {
+ LOG(1, "Device %s does not exist", name);
+ return 0;
+ }
+
+out:
+ dm_task_destroy(dmt);
+
+ return info.event_nr;
+}
+
+void *waitevent (void * et)
+{
+ int event_nr;
+ struct event_thread *waiter;
+
+ waiter = (struct event_thread *)et;
+ pthread_mutex_lock (waiter->waiter_lock);
+
+ event_nr = geteventnr (waiter->mapname);
+
+ struct dm_task *dmt;
+
+ if (!(dmt = dm_task_create(DM_DEVICE_WAITEVENT)))
+ return 0;
+
+ if (!dm_task_set_name(dmt, waiter->mapname))
+ goto out;
+
+ if (event_nr && !dm_task_set_event_nr(dmt, event_nr))
+ goto out;
+
+ dm_task_run(dmt);
+
+out:
+ dm_task_destroy(dmt);
+
+ /* tell waiterloop we have an event */
+ pthread_mutex_lock (event_lock);
+ pthread_cond_signal(event);
+ pthread_mutex_unlock (event_lock);
+
+ /* release waiter_lock so that waiterloop knows we are gone */
+ pthread_mutex_unlock (waiter->waiter_lock);
+ pthread_exit(waiter->thread);
+
+ return (NULL);
+}
+
+void *waiterloop (void *ap)
+{
+ struct paths *failedpaths;
+ struct devmap *devmaps, *devmaps_p;
+ struct event_thread *waiters, *waiters_p;
+ int r;
+
+ /* inits */
+ failedpaths = (struct paths *)ap;
+ devmaps = malloc (MAXMAPS * sizeof (struct devmap));
+ waiters = malloc (MAXMAPS * sizeof (struct event_thread));
+ memset (waiters, 0, MAXMAPS * sizeof (struct event_thread));
+
+ while (1) {
+
+ /* update devmap list */
+ LOG (1, "[event thread] refresh devmaps list");
+ get_devmaps (devmaps);
+
+ /* update failed paths list */
+ LOG (1, "[event thread] refresh failpaths list");
+ updatepaths (devmaps, failedpaths);
+
+ /* start waiters on all devmaps */
+ LOG (1, "[event thread] start up event loops");
+ waiters_p = waiters;
+ devmaps_p = devmaps;
+
+ while (*devmaps_p->mapname != 0x0) {
+
+ /* find out if devmap already has a running waiter thread */
+ while (*waiters_p->mapname != 0x0) {
+ if (!strcmp (waiters_p->mapname, devmaps_p->mapname))
+ break;
+ waiters_p++;
+ }
+
+ /* no event_thread struct : init it */
+ if (*waiters_p->mapname == 0x0) {
+ strcpy (waiters_p->mapname, devmaps_p->mapname);
+ waiters_p->thread = malloc (sizeof (pthread_t));
+ waiters_p->waiter_lock = (pthread_mutex_t *) malloc (sizeof (pthread_mutex_t));
+ pthread_mutex_init (waiters_p->waiter_lock, NULL);
+ }
+
+ /* event_thread struct found */
+ if (*waiters_p->mapname != 0x0) {
+ r = pthread_mutex_trylock (waiters_p->waiter_lock);
+ /* thread already running : out */
+
+ if (r)
+ goto out;
+
+ pthread_mutex_unlock (waiters_p->waiter_lock);
+ }
+
+ LOG (1, "[event thread] create event thread for %s", waiters_p->mapname);
+ pthread_create (waiters_p->thread, NULL, waitevent, waiters_p);
+out:
+ waiters_p = waiters;
+ devmaps_p++;
+ }
+
+ /* wait event condition */
+ pthread_mutex_lock (event_lock);
+ pthread_cond_wait(event, event_lock);
+ pthread_mutex_unlock (event_lock);
+
+ LOG (1, "[event thread] event caught");
+ }
+
+ return (NULL);
+}
+
+void *checkerloop (void *ap)
+{
+ struct paths *failedpaths;
+ struct path *path_p;
+ char *cmdargs[4] = {MULTIPATH, "-D", NULL, NULL};
+ char major[5];
+ char minor[5];
+ int status;
+
+ failedpaths = (struct paths *)ap;
+
+ LOG (1, "[checker thread] path checkers start up");
+
+ while (1) {
+ path_p = failedpaths->paths_h;
+ pthread_mutex_lock (failedpaths->lock);
+ LOG (2, "[checker thread] checking paths");
+ while (path_p->major != 0) {
+
+ if (checkpath (path_p)) {
+ LOG (1, "[checker thread] reconfigure %s\n", path_p->mapname);
+ snprintf (major, 5, "%i", path_p->major);
+ snprintf (minor, 5, "%i", path_p->minor);
+ cmdargs[2] = major;
+ cmdargs[3] = minor;
+ if (fork () == 0)
+ execve (cmdargs[0], cmdargs, NULL);
+
+ wait (&status);
+ /* MULTIPATH will ask for failedpaths refresh (SIGHUP) */
+ }
+
+ path_p++;
+
+ /* test vector overflow */
+ if (path_p - failedpaths->paths_h >= MAXPATHS * sizeof (struct path)) {
+ LOG (1, "[checker thread] path_h overflow");
+ pthread_mutex_unlock (failedpaths->lock);
+ return (NULL);
+ }
+ }
+ pthread_mutex_unlock (failedpaths->lock);
+ sleep(CHECKINT);
+ }
+
+ return (NULL);
+}
+
+struct paths *initpaths (void)
+{
+ struct paths *failedpaths;
+
+ failedpaths = malloc (sizeof (struct paths));
+ failedpaths->paths_h = malloc (MAXPATHS * sizeof (struct path));
+ failedpaths->lock = (pthread_mutex_t *) malloc (sizeof (pthread_mutex_t));
+ pthread_mutex_init (failedpaths->lock, NULL);
+ event = (pthread_cond_t *) malloc (sizeof (pthread_cond_t));
+ pthread_cond_init (event, NULL);
+ event_lock = (pthread_mutex_t *) malloc (sizeof (pthread_mutex_t));
+ pthread_mutex_init (event_lock, NULL);
+
+ return (failedpaths);
+}
+
+void pidfile (pid_t pid)
+{
+ FILE *file;
+ struct stat *buf;
+
+ buf = malloc (sizeof (struct stat));
+
+ if (!stat (PIDFILE, buf)) {
+ LOG(1, "[master thread] already running : out");
+ free (buf);
+ exit (1);
+ }
+
+ umask (022);
+ pid = setsid ();
+
+ if (pid < -1) {
+ LOG(1, "[master thread] setsid() error");
+ exit (1);
+ }
+
+ file = fopen (PIDFILE, "w");
+ fprintf (file, "%d\n", pid);
+ fclose (file);
+ free (buf);
+}
+
+void *
+signal_set(int signo, void (*func) (int))
+{
+ int r;
+ struct sigaction sig;
+ struct sigaction osig;
+
+ sig.sa_handler = func;
+ sigemptyset(&sig.sa_mask);
+ sig.sa_flags = 0;
+
+ r = sigaction(signo, &sig, &osig);
+
+ if (r < 0)
+ return (SIG_ERR);
+ else
+ return (osig.sa_handler);
+}
+
+void sighup (int sig)
+{
+ LOG (1, "[master thread] SIGHUP caught : refresh devmap list");
+
+ /* ask for failedpaths refresh */
+ pthread_mutex_lock (event_lock);
+ pthread_cond_signal(event);
+ pthread_mutex_unlock (event_lock);
+}
+
+void sigend (int sig)
+{
+ LOG (1, "[master thread] unlink pidfile");
+ unlink (PIDFILE);
+ LOG (1, "[master thread] --------shut down-------");
+ exit (0);
+}
+
+void signal_init(void)
+{
+ signal_set(SIGHUP, sighup);
+ signal_set(SIGINT, sigend);
+ signal_set(SIGTERM, sigend);
+ signal_set(SIGKILL, sigend);
+}
+
+int main (int argc, char *argv[])
+{
+ pthread_t wait, check;
+ struct paths *failedpaths;
+ pid_t pid;
+
+ pid = fork ();
+
+ /* can't fork */
+ if (pid < 0)
+ exit (1);
+
+ /* let the parent die happy */
+ if (pid > 0)
+ exit (0);
+
+ /* child's play */
+ openlog (argv[0], 0, LOG_DAEMON);
+ LOG (1, "[master thread] --------start up--------");
+
+ pidfile (pid);
+ signal_init ();
+
+ failedpaths = initpaths ();
+
+ pthread_create (&wait, NULL, waiterloop, failedpaths);
+ pthread_create (&check, NULL, checkerloop, failedpaths);
+ pthread_join (wait, NULL);
+ pthread_join (check, NULL);
+
+ return 0;
+}
--- /dev/null
+#!/bin/sh
+
+PATH=/bin:/usr/bin:/sbin:/usr/sbin
+DAEMON=/usr/bin/multipathd
+PIDFILE=/var/run/multipathd.pid
+
+test -x $DAEMON || exit 0
+
+case "$1" in
+ start)
+ echo -n "Starting multipath daemon: multipathd"
+ if start-stop-daemon --quiet --stop --signal 0 --pidfile $PIDFILE --name multipathd
+ then
+ echo " already running."
+ exit
+ fi
+ /sbin/start-stop-daemon --start --quiet --exec $DAEMON
+ echo "."
+ ;;
+ stop)
+ echo -n "Stopping multipath daemon: multipathd"
+ if start-stop-daemon --quiet --stop --signal 0 --pidfile $PIDFILE --name multipathd
+ then
+ PID=`cat $PIDFILE`
+ start-stop-daemon --quiet --stop --exec $DAEMON --pidfile $PIDFILE --name multipathd
+ # Now we wait for it to die
+ while kill -0 $PID 2>/dev/null; do sleep 1; done
+ echo "."
+ else
+ echo " not running.";
+ fi
+ ;;
+ force-reload|restart)
+ $0 stop
+ $0 start
+ ;;
+ *)
+ echo "Usage: /etc/init.d/multipathd {start|stop|restart|force-reload}"
+ exit 1
+esac
+
+exit 0
--- /dev/null
+#ifdef SG_KERNEL_INCLUDES
+ #define __user
+ typedef unsigned char u8;
+ #include "/usr/src/linux/include/scsi/sg.h"
+ #include "/usr/src/linux/include/scsi/scsi.h"
+#else
+ #ifdef SG_TRICK_GNU_INCLUDES
+ #include <linux/../scsi/sg.h>
+ #include <linux/../scsi/scsi.h>
+ #else
+ #include <scsi/sg.h>
+ #endif
+#endif
+
+/*
+ Getting the correct include files for the sg interface can be an ordeal.
+ In a perfect world, one would just write:
+ #include <scsi/sg.h>
+ #include <scsi/scsi.h>
+ This would include the files found in the /usr/include/scsi directory.
+ Those files are maintained with the GNU library which may or may not
+ agree with the kernel and version of sg driver that is running. Any
+ many cases this will not matter. However in some it might, for example
+ glibc 2.1's include files match the sg driver found in the lk 2.2
+ series. Hence if glibc 2.1 is used with lk 2.4 then the additional
+ sg v3 interface will not be visible.
+ If this is a problem then defining SG_KERNEL_INCLUDES will access the
+ kernel supplied header files (assuming they are in the normal place).
+ The GNU library maintainers and various kernel people don't like
+ this approach (but it does work).
+ The technique selected by defining SG_TRICK_GNU_INCLUDES worked (and
+ was used) prior to glibc 2.2 . Prior to that version /usr/include/linux
+ was a symbolic link to /usr/src/linux/include/linux .
+
+ There are other approaches if this include "mixup" causes pain. These
+ would involve include files being copied or symbolic links being
+ introduced.
+
+ Sorry about the inconvenience. Typically neither SG_KERNEL_INCLUDES
+ nor SG_TRICK_GNU_INCLUDES is defined.
+
+ dpg 20010415, 20030522
+*/
~ianmdlvl / elogind.git / commitdiff