[dm-devel] device-mapper ./WHATS_NEW ./configure ./config ...
agk at sourceware.org
agk at sourceware.org
Thu Oct 12 15:42:26 UTC 2006
CVSROOT: /cvs/dm
Module name: device-mapper
Changes by: agk at sourceware.org 2006-10-12 15:42:25
Modified files:
. : WHATS_NEW configure configure.in
dmsetup : dmsetup.c
include : configure.h.in
kernel/ioctl : dm-ioctl.h
lib : .exported_symbols libdevmapper.h
lib/ioctl : libdm-iface.c libdm-targets.h
man : dmsetup.8
Log message:
Add suspend noflush support.
Add basic dmsetup loop support.
Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/WHATS_NEW.diff?cvsroot=dm&r1=1.124&r2=1.125
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/configure.diff?cvsroot=dm&r1=1.37&r2=1.38
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/configure.in.diff?cvsroot=dm&r1=1.38&r2=1.39
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/dmsetup/dmsetup.c.diff?cvsroot=dm&r1=1.71&r2=1.72
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/include/configure.h.in.diff?cvsroot=dm&r1=1.1&r2=1.2
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/kernel/ioctl/dm-ioctl.h.diff?cvsroot=dm&r1=1.43&r2=1.44
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/lib/.exported_symbols.diff?cvsroot=dm&r1=1.22&r2=1.23
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/lib/libdevmapper.h.diff?cvsroot=dm&r1=1.58&r2=1.59
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/lib/ioctl/libdm-iface.c.diff?cvsroot=dm&r1=1.37&r2=1.38
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/lib/ioctl/libdm-targets.h.diff?cvsroot=dm&r1=1.18&r2=1.19
http://sourceware.org/cgi-bin/cvsweb.cgi/device-mapper/man/dmsetup.8.diff?cvsroot=dm&r1=1.14&r2=1.15
--- device-mapper/WHATS_NEW 2006/10/03 21:51:28 1.124
+++ device-mapper/WHATS_NEW 2006/10/12 15:42:24 1.125
@@ -1,5 +1,7 @@
Version 1.02.11 -
=============================
+ Add suspend noflush support.
+ Add basic dmsetup loop support.
Version 1.02.10 - 19 Sep 2006
=============================
--- device-mapper/configure 2006/05/10 19:38:25 1.37
+++ device-mapper/configure 2006/10/12 15:42:24 1.38
@@ -3735,7 +3735,8 @@
-for ac_header in termios.h
+
+for ac_header in termios.h sys/statvfs.h
do
as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
if eval "test \"\${$as_ac_Header+set}\" = set"; then
@@ -5445,6 +5446,81 @@
################################################################################
+
+echo "$as_me:$LINENO: checking for canonicalize_file_name in -lc" >&5
+echo $ECHO_N "checking for canonicalize_file_name in -lc... $ECHO_C" >&6
+if test "${ac_cv_lib_c_canonicalize_file_name+set}" = set; then
+ echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+ ac_check_lib_save_LIBS=$LIBS
+LIBS="-lc $LIBS"
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h. */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h. */
+
+/* Override any gcc2 internal prototype to avoid an error. */
+#ifdef __cplusplus
+extern "C"
+#endif
+/* We use char because int might match the return type of a gcc2
+ builtin and then its argument prototype would still apply. */
+char canonicalize_file_name ();
+int
+main ()
+{
+canonicalize_file_name ();
+ ;
+ return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5
+ (eval $ac_link) 2>conftest.er1
+ ac_status=$?
+ grep -v '^ *+' conftest.er1 >conftest.err
+ rm -f conftest.er1
+ cat conftest.err >&5
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); } &&
+ { ac_try='test -z "$ac_c_werror_flag"
+ || test ! -s conftest.err'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; } &&
+ { ac_try='test -s conftest$ac_exeext'
+ { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ echo "$as_me:$LINENO: \$? = $ac_status" >&5
+ (exit $ac_status); }; }; then
+ ac_cv_lib_c_canonicalize_file_name=yes
+else
+ echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_cv_lib_c_canonicalize_file_name=no
+fi
+rm -f conftest.err conftest.$ac_objext \
+ conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+echo "$as_me:$LINENO: result: $ac_cv_lib_c_canonicalize_file_name" >&5
+echo "${ECHO_T}$ac_cv_lib_c_canonicalize_file_name" >&6
+if test $ac_cv_lib_c_canonicalize_file_name = yes; then
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_CANONICALIZE_FILE_NAME 1
+_ACEOF
+
+fi
+
+
+################################################################################
echo "$as_me:$LINENO: checking whether to enable selinux support" >&5
echo $ECHO_N "checking whether to enable selinux support... $ECHO_C" >&6
# Check whether --enable-selinux or --disable-selinux was given.
--- device-mapper/configure.in 2006/05/10 19:38:25 1.38
+++ device-mapper/configure.in 2006/10/12 15:42:24 1.39
@@ -71,7 +71,7 @@
AC_CHECK_HEADERS(ctype.h dirent.h errno.h fcntl.h getopt.h inttypes.h limits.h stdarg.h stdio.h stdlib.h string.h sys/ioctl.h sys/param.h sys/stat.h sys/types.h unistd.h,,AC_MSG_ERROR(bailing out))
-AC_CHECK_HEADERS(termios.h)
+AC_CHECK_HEADERS(termios.h sys/statvfs.h)
################################################################################
dnl -- Checks for typedefs, structures, and compiler characteristics.
AC_C_CONST
@@ -210,6 +210,11 @@
AC_CHECK_LIB(c, getline, AC_DEFINE([HAVE_GETLINE], 1, [Define to 1 if getline is available.]))
################################################################################
+dnl -- canonicalize_file_name included in recent libc
+
+AC_CHECK_LIB(c, canonicalize_file_name, AC_DEFINE([HAVE_CANONICALIZE_FILE_NAME], 1, [Define to 1 if canonicalize_file_name is available.]))
+
+################################################################################
dnl -- Disable selinux
AC_MSG_CHECKING(whether to enable selinux support)
AC_ARG_ENABLE(selinux, [ --disable-selinux Disable selinux support],
--- device-mapper/dmsetup/dmsetup.c 2006/08/10 20:53:21 1.71
+++ device-mapper/dmsetup/dmsetup.c 2006/10/12 15:42:24 1.72
@@ -1,6 +1,6 @@
/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
- * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
* Copyright (C) 2005 NEC Corperation
*
* This file is part of the device-mapper userspace tools.
@@ -38,6 +38,16 @@
#include <locale.h>
#include <langinfo.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+/* FIXME Unused so far */
+#undef HAVE_SYS_STATVFS_H
+
+#ifdef HAVE_SYS_STATVFS_H
+# include <sys/statvfs.h>
+#endif
+
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
@@ -78,6 +88,11 @@
#define LINE_SIZE 4096
#define ARGS_MAX 256
+#define LOOP_TABLE_SIZE (PATH_MAX + 255)
+
+/* FIXME Should be elsewhere */
+#define SECTOR_SHIFT 9L
+#define DEV_PATH "/dev/"
#define err(msg, x...) fprintf(stderr, msg "\n", ##x)
@@ -93,6 +108,7 @@
MAJOR_ARG,
MINOR_ARG,
MODE_ARG,
+ NOFLUSH_ARG,
NOHEADINGS_ARG,
NOLOCKFS_ARG,
NOOPENCOUNT_ARG,
@@ -180,7 +196,7 @@
#ifndef HAVE_GETLINE
buffer_size = LINE_SIZE;
- if (!(buffer = malloc(buffer_size))) {
+ if (!(buffer = dm_malloc(buffer_size))) {
err("Failed to malloc line buffer.");
return 0;
}
@@ -195,7 +211,7 @@
r = 1;
out:
- free(buffer);
+ dm_free(buffer);
if (file)
fclose(fp);
return r;
@@ -512,7 +528,7 @@
for (i = 0; i < argc; i++)
sz += strlen(argv[i]) + 1;
- str = malloc(sz);
+ str = dm_malloc(sz);
memset(str, 0, sz);
for (i = 0; i < argc; i++) {
@@ -524,7 +540,7 @@
if (!dm_task_set_message(dmt, str))
goto out;
- free(str);
+ dm_free(str);
if (_switches[NOOPENCOUNT_ARG] && !dm_task_no_open_count(dmt))
goto out;
@@ -603,6 +619,9 @@
if (event_nr && !dm_task_set_event_nr(dmt, event_nr))
goto out;
+ if (_switches[NOFLUSH_ARG] && !dm_task_no_flush(dmt))
+ goto out;
+
if (_switches[NOOPENCOUNT_ARG] && !dm_task_no_open_count(dmt))
goto out;
@@ -744,28 +763,28 @@
return 0;
if (!_set_task_device(dmt, name, 0))
- goto err;
+ goto error;
if (!dm_task_add_target(dmt, 0, size, "error", ""))
- goto err;
+ goto error;
if (_switches[READ_ONLY] && !dm_task_set_ro(dmt))
- goto err;
+ goto error;
if (_switches[NOOPENCOUNT_ARG] && !dm_task_no_open_count(dmt))
- goto err;
+ goto error;
if (!dm_task_run(dmt))
- goto err;
+ goto error;
if (!_simple(DM_DEVICE_RESUME, name, 0, 0)) {
_simple(DM_DEVICE_CLEAR, name, 0, 0);
- goto err;
+ goto error;
}
r = 1;
-err:
+error:
dm_task_destroy(dmt);
return r;
}
@@ -1518,7 +1537,8 @@
fprintf(out, "Usage:\n\n");
fprintf(out, "dmsetup [--version] [-v|--verbose [-v|--verbose ...]]\n"
- " [-r|--readonly] [--noopencount] [--nolockfs]\n\n");
+ " [-r|--readonly] [--noopencount] [--nolockfs]\n"
+ " [--noflush]\n\n");
for (i = 0; _commands[i].name; i++)
fprintf(out, "\t%s %s\n", _commands[i].name, _commands[i].help);
fprintf(out, "\n<device> may be device name or -u <uuid> or "
@@ -1529,6 +1549,13 @@
return;
}
+static void _losetup_usage(FILE *out)
+{
+ fprintf(out, "Usage:\n\n");
+ fprintf(out, "losetup [-d|-a] [-e encryption] "
+ "[-o offset] [-f|loop_device] [file]\n\n");
+}
+
static struct command *_find_command(const char *name)
{
int i;
@@ -1606,11 +1633,225 @@
return 1;
}
+/*
+ * Returns the full absolute path, or NULL if the path could
+ * not be resolved.
+ */
+static char *_get_abspath(char *path)
+{
+ char *_path;
+
+#ifdef HAVE_CANONICALIZE_FILE_NAME
+ _path = canonicalize_file_name(path);
+#else
+ /* FIXME Provide alternative */
+#endif
+ return _path;
+}
+
+static char *parse_loop_device_name(char *dev)
+{
+ char *buf;
+ char *device;
+
+ if (!(buf = dm_malloc(PATH_MAX)));
+ return NULL;
+
+ if (dev[0] == '/') {
+ if (!(device = _get_abspath(dev)))
+ goto error;
+
+ if (strncmp(device, DEV_PATH, strlen(DEV_PATH)))
+ goto error;
+
+ strncpy(buf, strrchr(device, '/') + 1, PATH_MAX);
+ dm_free(device);
+
+ } else {
+ /* check for device number */
+ if (!strncmp(dev, "loop", strlen("loop")))
+ strncpy(buf, dev, PATH_MAX);
+ else
+ goto error;
+ }
+
+ return buf;
+
+error:
+ return NULL;
+}
+
+/*
+ * create a table for a mapped device using the loop target.
+ */
+static int _loop_table(char *table, size_t tlen, char *file, char *dev, off_t off)
+{
+ struct stat fbuf;
+ off_t size, sectors;
+ int fd = -1;
+#ifdef HAVE_SYS_STATVFS_H
+ struct statvfs fsbuf;
+ off_t blksize;
+#endif
+
+ if (!_switches[READ_ONLY])
+ fd = open(file, O_RDWR);
+
+ if (fd < 0) {
+ _switches[READ_ONLY]++;
+ fd = open(file, O_RDONLY);
+ }
+
+ if (fd < 0)
+ goto error;
+
+ if (fstat(fd, &fbuf))
+ goto error;
+
+ size = (fbuf.st_size - off);
+ sectors = size >> SECTOR_SHIFT;
+
+ if (_switches[VERBOSE_ARG])
+ fprintf(stderr, "losetup: set loop size to %llukB (%llu sectors)\n",
+ sectors >> 1, sectors);
+
+#ifdef HAVE_SYS_STATVFS_H
+ if (fstatvfs(fd, &fsbuf))
+ goto error;
+
+ /* FIXME Fragment size currently unused */
+ blksize = fsbuf.f_frsize;
+#endif
+
+ close(fd);
+
+ if (dm_snprintf(table, tlen, "%llu %llu loop %s %llu\n", 0ULL,
+ (long long unsigned)sectors, file, off) < 0)
+ return 0;
+
+ if (_switches[VERBOSE_ARG] > 1)
+ fprintf(stderr, "Table: %s\n", table);
+
+ return 1;
+
+error:
+ if (fd > -1)
+ close(fd);
+ return 0;
+}
+
+static int _process_losetup_switches(const char *base, int *argc, char ***argv)
+{
+ static int ind;
+ int c;
+ int encrypt_loop = 0, delete = 0, find = 0, show_all = 0;
+ char *device_name = NULL;
+ char *loop_file = NULL;
+ off_t offset = 0;
+
+#ifdef HAVE_GETOPTLONG
+ static struct option long_options[] = {
+ {0, 0, 0, 0}
+ };
+#endif
+
+ optarg = 0;
+ optind = OPTIND_INIT;
+ while ((ind = -1, c = GETOPTLONG_FN(*argc, *argv, "ade:fo:v",
+ long_options, NULL)) != -1 ) {
+ if (c == ':' || c == '?')
+ return 0;
+ if (c == 'a')
+ show_all++;
+ if (c == 'd')
+ delete++;
+ if (c == 'e')
+ encrypt_loop++;
+ if (c == 'f')
+ find++;
+ if (c == 'o')
+ offset = atoi(optarg);
+ if (c == 'v')
+ _switches[VERBOSE_ARG]++;
+ }
+
+ *argv += optind ;
+ *argc -= optind ;
+
+ if (encrypt_loop){
+ fprintf(stderr, "%s: Sorry, cryptoloop is not yet implemented "
+ "in this version.\n", base);
+ return 0;
+ }
+
+ if (show_all) {
+ fprintf(stderr, "%s: Sorry, show all is not yet implemented "
+ "in this version.\n", base);
+ return 0;
+ }
+
+ if (find) {
+ fprintf(stderr, "%s: Sorry, find is not yet implemented "
+ "in this version.\n", base);
+ if (!*argc)
+ return 0;
+ }
+
+ if (!*argc) {
+ fprintf(stderr, "%s: Please specify loop_device.\n", base);
+ _losetup_usage(stderr);
+ return 0;
+ }
+
+ if (!(device_name = parse_loop_device_name((*argv)[0]))) {
+ fprintf(stderr, "%s: Could not parse loop_device %s\n",
+ base, (*argv)[0]);
+ _losetup_usage(stderr);
+ return 0;
+ }
+
+ if (delete) {
+ *argc = 2;
+
+ (*argv)[1] = device_name;
+ (*argv)[0] = (char *) "remove";
+
+ return 1;
+ }
+
+ if (*argc != 2) {
+ fprintf(stderr, "%s: Too few arguments\n", base);
+ _losetup_usage(stderr);
+ return 0;
+ }
+
+ /* FIXME move these to make them available to native dmsetup */
+ if (!(loop_file = _get_abspath((*argv)[(find) ? 0 : 1]))) {
+ fprintf(stderr, "%s: Could not parse loop file name %s\n",
+ base, (*argv)[1]);
+ _losetup_usage(stderr);
+ return 0;
+ }
+
+ /* FIXME Missing free */
+ _table = dm_malloc(LOOP_TABLE_SIZE);
+ if (!_loop_table(_table, LOOP_TABLE_SIZE, loop_file, device_name, offset)) {
+ fprintf(stderr, "Could not build device-mapper table for %s\n", (*argv)[0]);
+ return 0;
+ }
+ _switches[TABLE_ARG]++;
+
+ (*argv)[0] = (char *) "create";
+ (*argv)[1] = device_name ;
+
+ return 1;
+}
+
static int _process_switches(int *argc, char ***argv)
{
char *base, *namebase;
static int ind;
- int c;
+ int c, r;
#ifdef HAVE_GETOPTLONG
static struct option long_options[] = {
@@ -1622,6 +1863,7 @@
{"major", 1, &ind, MAJOR_ARG},
{"minor", 1, &ind, MINOR_ARG},
{"mode", 1, &ind, MODE_ARG},
+ {"noflush", 0, &ind, NOFLUSH_ARG},
{"noheadings", 0, &ind, NOHEADINGS_ARG},
{"nolockfs", 0, &ind, NOLOCKFS_ARG},
{"noopencount", 0, &ind, NOOPENCOUNT_ARG},
@@ -1678,6 +1920,12 @@
return 1;
}
+ if(!strcmp(base, "losetup") || !strcmp(base, "dmlosetup")){
+ r = _process_losetup_switches(base, argc, argv);
+ free(namebase);
+ return r;
+ }
+
free(namebase);
optarg = 0;
@@ -1733,6 +1981,8 @@
_switches[TARGET_ARG]++;
_target = optarg;
}
+ if ((ind == NOFLUSH_ARG))
+ _switches[NOFLUSH_ARG]++;
if ((ind == NOHEADINGS_ARG))
_switches[NOHEADINGS_ARG]++;
if ((ind == NOLOCKFS_ARG))
--- device-mapper/include/configure.h.in 2006/05/10 19:38:25 1.1
+++ device-mapper/include/configure.h.in 2006/10/12 15:42:24 1.2
@@ -3,6 +3,9 @@
/* Define to 1 if the `closedir' function returns void instead of `int'. */
#undef CLOSEDIR_VOID
+/* Define to 1 if canonicalize_file_name is available. */
+#undef HAVE_CANONICALIZE_FILE_NAME
+
/* Define to 1 if you have the <ctype.h> header file. */
#undef HAVE_CTYPE_H
@@ -113,6 +116,9 @@
/* Define to 1 if you have the <sys/param.h> header file. */
#undef HAVE_SYS_PARAM_H
+/* Define to 1 if you have the <sys/statvfs.h> header file. */
+#undef HAVE_SYS_STATVFS_H
+
/* Define to 1 if you have the <sys/stat.h> header file. */
#undef HAVE_SYS_STAT_H
--- device-mapper/kernel/ioctl/dm-ioctl.h 2006/08/21 12:04:49 1.43
+++ device-mapper/kernel/ioctl/dm-ioctl.h 2006/10/12 15:42:24 1.44
@@ -287,9 +287,9 @@
#define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl)
#define DM_VERSION_MAJOR 4
-#define DM_VERSION_MINOR 8
+#define DM_VERSION_MINOR 11
#define DM_VERSION_PATCHLEVEL 0
-#define DM_VERSION_EXTRA "-ioctl (2006-06-08)"
+#define DM_VERSION_EXTRA "-ioctl (2006-10-12)"
/* Status bits */
#define DM_READONLY_FLAG (1 << 0) /* In/Out */
@@ -325,4 +325,9 @@
*/
#define DM_SKIP_LOCKFS_FLAG (1 << 10) /* In */
+/*
+ * Set this to suspend without flushing queued ios.
+ */
+#define DM_NOFLUSH_FLAG (1 << 11) /* In */
+
#endif /* _LINUX_DM_IOCTL_H */
--- device-mapper/lib/.exported_symbols 2006/08/21 12:52:39 1.22
+++ device-mapper/lib/.exported_symbols 2006/10/12 15:42:24 1.23
@@ -28,6 +28,7 @@
dm_task_set_mode
dm_task_suppress_identical_reload
dm_task_add_target
+dm_task_no_flush
dm_task_no_open_count
dm_task_skip_lockfs
dm_task_update_nodes
--- device-mapper/lib/libdevmapper.h 2006/08/21 12:52:39 1.58
+++ device-mapper/lib/libdevmapper.h 2006/10/12 15:42:24 1.59
@@ -151,6 +151,7 @@
int dm_task_set_geometry(struct dm_task *dmt, const char *cylinders, const char *heads, const char *sectors, const char *start);
int dm_task_set_message(struct dm_task *dmt, const char *message);
int dm_task_set_sector(struct dm_task *dmt, uint64_t sector);
+int dm_task_no_flush(struct dm_task *dmt);
int dm_task_no_open_count(struct dm_task *dmt);
int dm_task_skip_lockfs(struct dm_task *dmt);
int dm_task_suppress_identical_reload(struct dm_task *dmt);
--- device-mapper/lib/ioctl/libdm-iface.c 2006/08/08 21:22:31 1.37
+++ device-mapper/lib/ioctl/libdm-iface.c 2006/10/12 15:42:24 1.38
@@ -1026,6 +1026,13 @@
return 1;
}
+int dm_task_no_flush(struct dm_task *dmt)
+{
+ dmt->noflush = 1;
+
+ return 1;
+}
+
int dm_task_no_open_count(struct dm_task *dmt)
{
dmt->no_open_count = 1;
@@ -1270,6 +1277,8 @@
if (dmt->type == DM_DEVICE_SUSPEND)
dmi->flags |= DM_SUSPEND_FLAG;
+ if (dmt->noflush)
+ dmi->flags |= DM_NOFLUSH_FLAG;
if (dmt->read_only)
dmi->flags |= DM_READONLY_FLAG;
if (dmt->skip_lockfs)
--- device-mapper/lib/ioctl/libdm-targets.h 2006/02/20 23:55:58 1.18
+++ device-mapper/lib/ioctl/libdm-targets.h 2006/10/12 15:42:24 1.19
@@ -52,6 +52,7 @@
char *message;
char *geometry;
uint64_t sector;
+ int noflush;
int no_open_count;
int skip_lockfs;
int suppress_identical_reload;
--- device-mapper/man/dmsetup.8 2006/08/10 14:11:03 1.14
+++ device-mapper/man/dmsetup.8 2006/10/12 15:42:25 1.15
@@ -13,7 +13,7 @@
.I [-f|--force]
.br
.B dmsetup suspend
-.I [--nolockfs] device_name
+.I [--nolockfs] [--noflush] device_name
.br
.B dmsetup resume
.I device_name
@@ -213,7 +213,7 @@
With --target, only information relating to the specified target type
is displayed.
.IP \fBsuspend
-.I [--nolockfs]
+.I [--nolockfs] [--noflush]
.I device_name
.br
Suspends a device. Any I/O that has already been mapped by the device
@@ -221,6 +221,9 @@
device will be postponed for as long as the device is suspended.
If there's a filesystem on the device which supports the operation,
an attempt will be made to sync it first unless --nolockfs is specified.
+Some targets such as recent (October 2006) versions of multipath may support
+the --noflush option. This lets outstanding I/O that has not yet reached the
+device to remain unflushed.
.IP \fBtable
.I [--target target_type]
.I [device_name]
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