[APPENDIX PATCH 4/5] blk_end_request: userspace device-mapper forrequest-based dm
From: Kiyoshi Ueda
Date: Fri Aug 31 2007 - 18:47:00 EST
This patch adds a feature of turning request-based dm on
to device-mapper userspace tool.
To turn on request-based dm, following steps should work:
1. # dmsetup create --rqbase mpath0
2. # echo <multipath table> | dmsetup load mpath0
3. # dmsetup resume mpath0
Note: If you used bio-based targets for request-based dm device,
you would hit kernel panic. And vice versa. (This is TODO.)
The patch-set converts only multipath target to request-based.
So please don't use other targets for request-based dm device
and patched multipath target for bio-based dm device.
If you use multipath-tools (another patch), multipath-tools should
take care of all.
This patch should be applied on top of CVS device-mapper-1.02.23
of 8/28/2007.
Request-based dm itself is still under development and not ready
for inclusion.
Signed-off-by: Kiyoshi Ueda <k-ueda@xxxxxxxxxxxxx>
Signed-off-by: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>
---
dmsetup/dmsetup.c | 9 ++++++++-
kernel/ioctl/dm-ioctl.h | 5 +++++
lib/.exported_symbols | 1 +
lib/ioctl/libdm-iface.c | 13 ++++++++++++-
lib/ioctl/libdm-targets.h | 1 +
lib/libdevmapper.h | 1 +
6 files changed, 28 insertions(+), 2 deletions(-)
diff -rupN cvs-device-mapper-20070828/dmsetup/dmsetup.c rqdm-device-mapper/dmsetup/dmsetup.c
--- cvs-device-mapper-20070828/dmsetup/dmsetup.c 2007-08-21 12:26:06.000000000 -0400
+++ rqdm-device-mapper/dmsetup/dmsetup.c 2007-08-28 17:47:04.000000000 -0400
@@ -119,6 +119,7 @@ enum {
NOOPENCOUNT_ARG,
NOTABLE_ARG,
OPTIONS_ARG,
+ RQBASE_ARG,
SEPARATOR_ARG,
SHOWKEYS_ARG,
SORT_ARG,
@@ -493,6 +493,9 @@ static int _create(int argc, char **argv,
if (_switches[NOOPENCOUNT_ARG] && !dm_task_no_open_count(dmt))
goto out;
+ if (_switches[RQBASE_ARG] && !dm_task_request_base(dmt))
+ goto out;
+
if (!dm_task_run(dmt))
goto out;
@@ -1978,7 +1982,7 @@ static struct command _commands[] = {
{"help", "[-c|-C|--columns]", 0, 0, _help},
{"create", "<dev_name> [-j|--major <major> -m|--minor <minor>]\n"
"\t [-U|--uid <uid>] [-G|--gid <gid>] [-M|--mode <octal_mode>]\n"
- "\t [-u|uuid <uuid>]\n"
+ "\t [-u|uuid <uuid>] [--rqbase]\n"
"\t [--notable | --table <table> | <table_file>]",
1, 2, _create},
{"remove", "[-f|--force] <device>", 0, 1, _remove},
@@ -2366,6 +2370,7 @@ static int _process_switches(int *argc,
{"noopencount", 0, &ind, NOOPENCOUNT_ARG},
{"notable", 0, &ind, NOTABLE_ARG},
{"options", 1, &ind, OPTIONS_ARG},
+ {"rqbase", 0, &ind, RQBASE_ARG},
{"separator", 1, &ind, SEPARATOR_ARG},
{"showkeys", 0, &ind, SHOWKEYS_ARG},
{"sort", 1, &ind, SORT_ARG},
@@ -2498,6 +2503,8 @@ static int _process_switches(int *argc,
_switches[NOLOCKFS_ARG]++;
if ((ind == NOOPENCOUNT_ARG))
_switches[NOOPENCOUNT_ARG]++;
+ if ((ind == RQBASE_ARG))
+ _switches[RQBASE_ARG]++;
if ((ind == SHOWKEYS_ARG))
_switches[SHOWKEYS_ARG]++;
if ((ind == TABLE_ARG)) {
diff -rupN cvs-device-mapper-20070828/kernel/ioctl/dm-ioctl.h rqdm-device-mapper/kernel/ioctl/dm-ioctl.h
--- cvs-device-mapper-20070828/kernel/ioctl/dm-ioctl.h 2006-10-12 11:42:24.000000000 -0400
+++ rqdm-device-mapper/kernel/ioctl/dm-ioctl.h 2007-08-28 17:47:04.000000000 -0400
@@ -330,4 +330,9 @@ typedef char ioctl_struct[308];
*/
#define DM_NOFLUSH_FLAG (1 << 11) /* In */
+/*
+ * Set this to create request based device-mapper device.
+ */
+#define DM_REQUEST_BASE_FLAG (1 << 12) /* In */
+
#endif /* _LINUX_DM_IOCTL_H */
diff -rupN cvs-device-mapper-20070828/lib/.exported_symbols rqdm-device-mapper/lib/.exported_symbols
--- cvs-device-mapper-20070828/lib/.exported_symbols 2007-07-28 06:48:36.000000000 -0400
+++ rqdm-device-mapper/lib/.exported_symbols 2007-08-28 17:47:04.000000000 -0400
@@ -32,6 +32,7 @@ dm_task_suppress_identical_reload
dm_task_add_target
dm_task_no_flush
dm_task_no_open_count
+dm_task_request_base
dm_task_skip_lockfs
dm_task_update_nodes
dm_task_run
diff -rupN cvs-device-mapper-20070828/lib/ioctl/libdm-iface.c rqdm-device-mapper/lib/ioctl/libdm-iface.c
--- cvs-device-mapper-20070828/lib/ioctl/libdm-iface.c 2007-08-21 12:26:07.000000000 -0400
+++ rqdm-device-mapper/lib/ioctl/libdm-iface.c 2007-08-28 17:47:04.000000000 -0400
@@ -1038,6 +1038,13 @@ int dm_task_no_open_count(struct dm_task
return 1;
}
+int dm_task_request_base(struct dm_task *dmt)
+{
+ dmt->request_base = 1;
+
+ return 1;
+}
+
int dm_task_skip_lockfs(struct dm_task *dmt)
{
dmt->skip_lockfs = 1;
@@ -1281,6 +1288,8 @@ static struct dm_ioctl *_flatten(struct
dmi->flags |= DM_READONLY_FLAG;
if (dmt->skip_lockfs)
dmi->flags |= DM_SKIP_LOCKFS_FLAG;
+ if (dmt->request_base)
+ dmi->flags |= DM_REQUEST_BASE_FLAG;
dmi->target_count = count;
dmi->event_nr = dmt->event_nr;
@@ -1412,6 +1421,7 @@ static int _create_and_load_v4(struct dm
task->uid = dmt->uid;
task->gid = dmt->gid;
task->mode = dmt->mode;
+ task->request_base = dmt->request_base;
r = dm_task_run(task);
dm_task_destroy(task);
@@ -1551,7 +1561,7 @@ static struct dm_ioctl *_do_dm_ioctl(str
dmi->flags |= DM_SKIP_BDGET_FLAG;
log_debug("dm %s %s %s%s%s %s%.0d%s%.0d%s"
- "%s%c%c%s %.0" PRIu64 " %s [%u]",
+ "%s%c%c%c%s %.0" PRIu64 " %s [%u]",
_cmd_data_v4[dmt->type].name,
dmi->name, dmi->uuid, dmt->newname ? " " : "",
dmt->newname ? dmt->newname : "",
@@ -1563,6 +1573,7 @@ static struct dm_ioctl *_do_dm_ioctl(str
dmt->major > 0 ? ") " : "",
dmt->no_open_count ? 'N' : 'O',
dmt->no_flush ? 'N' : 'F',
+ dmt->request_base ? 'R' : 'B',
dmt->skip_lockfs ? "S " : "",
dmt->sector, dmt->message ? dmt->message : "",
dmi->data_size);
diff -rupN cvs-device-mapper-20070828/lib/ioctl/libdm-targets.h rqdm-device-mapper/lib/ioctl/libdm-targets.h
--- cvs-device-mapper-20070828/lib/ioctl/libdm-targets.h 2007-08-21 12:26:07.000000000 -0400
+++ rqdm-device-mapper/lib/ioctl/libdm-targets.h 2007-08-28 17:47:04.000000000 -0400
@@ -54,6 +54,7 @@ struct dm_task {
uint64_t sector;
int no_flush;
int no_open_count;
+ int request_base;
int skip_lockfs;
int suppress_identical_reload;
diff -rupN cvs-device-mapper-20070828/lib/libdevmapper.h rqdm-device-mapper/lib/libdevmapper.h
--- cvs-device-mapper-20070828/lib/libdevmapper.h 2007-08-21 12:26:06.000000000 -0400
+++ rqdm-device-mapper/lib/libdevmapper.h 2007-08-28 17:47:04.000000000 -0400
@@ -154,6 +154,7 @@ int dm_task_set_message(struct dm_task *
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_request_base(struct dm_task *dmt);
int dm_task_skip_lockfs(struct dm_task *dmt);
int dm_task_suppress_identical_reload(struct dm_task *dmt);
-
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