report: Add cache_policy and cache_settings (LV) segment fields.

WHATS_NEW

@@ -1,5 +1,6 @@
 Version 2.02.115 -
 =====================================
+  Add cache_policy and cache_settings output fields in lvs.
   Add missing recognition for --binary option with {pv,vg,lv}display -C.
   Fix vgimportclone to notify lvmetad about changes done if lvmetad is used.
   Fix vgimportclone to properly override config if it is missing in lvm.conf.

lib/report/columns.h

@@ -178,6 +178,8 @@ FIELD(SEGS, seg, STR_LIST, "Seg Tags", tags, 8, tags, seg_tags, "Tags, if any.",
 FIELD(SEGS, seg, STR, "PE Ranges", list, 9, peranges, seg_pe_ranges, "Ranges of Physical Extents of underlying devices in command line format.", 0)
 FIELD(SEGS, seg, STR, "Devices", list, 7, devices, devices, "Underlying devices used with starting extent numbers.", 0)
 FIELD(SEGS, seg, STR, "Monitor", list, 7, segmonitor, seg_monitor, "Dmeventd monitoring status of the segment.", 0)
+FIELD(SEGS, seg, STR, "Cache Policy", list, 12, cache_policy, cache_policy, "The cache policy (cached segments only).", 0)
+FIELD(SEGS, seg, STR_LIST, "Cache Settings", list, 14, cache_settings, cache_settings, "Cache settings/parameters (cached segments only).", 0)
 
 FIELD(PVSEGS, pvseg, NUM, "Start", pe, 5, uint32, pvseg_start, "Physical Extent number of start of segment.", 0)
 FIELD(PVSEGS, pvseg, NUM, "SSize", len, 5, uint32, pvseg_size, "Number of extents in segment.", 0)

lib/report/properties.c

@@ -440,6 +440,11 @@ GET_LVSEG_STR_PROPERTY_FN(devices, lvseg_devices(lvseg->lv->vg->vgmem, lvseg))
 GET_LVSEG_STR_PROPERTY_FN(seg_monitor, lvseg_monitor_dup(lvseg->lv->vg->vgmem, lvseg))
 #define _seg_monitor_set prop_not_implemented_set
 
+#define _cache_policy_get prop_not_implemented_get
+#define _cache_policy_set prop_not_implemented_set
+#define _cache_settings_get prop_not_implemented_get
+#define _cache_settings_set prop_not_implemented_set
+
 /* PVSEG */
 GET_PVSEG_NUM_PROPERTY_FN(pvseg_start, pvseg->pe)
 #define _pvseg_start_set prop_not_implemented_set

lib/report/report.c

@@ -231,6 +231,74 @@ static int _tags_disp(struct dm_report *rh, struct dm_pool *mem,
 	return _field_set_string_list(rh, field, tagsl, private, 1);
 }
 
+struct _str_list_append_baton {
+	struct dm_pool *mem;
+	struct dm_list *result;
+};
+
+static int _str_list_append(const char *line, void *baton)
+{
+	struct _str_list_append_baton *b = baton;
+	const char *dup = dm_pool_strdup(b->mem, line);
+	if (!dup)
+		return_0;
+	if (!str_list_add(b->mem, b->result, dup))
+		return_0;
+	return 1;
+}
+
+static int _cache_settings_disp(struct dm_report *rh, struct dm_pool *mem,
+				struct dm_report_field *field,
+				const void *data, void *private)
+{
+	const struct lv_segment *seg = (const struct lv_segment *) data;
+	const struct dm_config_node *settings;
+	struct dm_list *result;
+	struct _str_list_append_baton baton;
+
+	if (seg_is_cache(seg))
+		seg = first_seg(seg->pool_lv);
+	else
+		return _field_set_value(field, "", NULL /* TODO: FIRST_NAME(cache_settings_undef) */);
+
+	if (seg->policy_settings)
+		settings = seg->policy_settings->child;
+	else
+		return _field_set_value(field, "", NULL /* TODO: FIRST_NAME(cache_settings_default) */);
+
+	if (!(result = str_list_create(mem)))
+		return_0;
+
+	baton.mem = mem;
+	baton.result = result;
+
+	while (settings) {
+		dm_config_write_one_node(settings, _str_list_append, &baton);
+		settings = settings->sib;
+	};
+
+	return _field_set_string_list(rh, field, result, private, 0);
+}
+
+static int _cache_policy_disp(struct dm_report *rh, struct dm_pool *mem,
+			      struct dm_report_field *field,
+			      const void *data, void *private)
+{
+	const struct lv_segment *seg = (const struct lv_segment *) data;
+
+	if (seg_is_cache(seg))
+		seg = first_seg(seg->pool_lv);
+	else
+		return _field_set_value(field, "", FIRST_NAME(cache_policy_undef));
+
+	if (seg->policy_name)
+		return _field_set_value(field, seg->policy_name, NULL);
+	else {
+		log_error(INTERNAL_ERROR "unexpected NULL policy name");
+		return_0;
+	}
+}
+
 static int _modules_disp(struct dm_report *rh, struct dm_pool *mem,
 			 struct dm_report_field *field,
 			 const void *data, void *private)

lib/report/values.h

@@ -81,4 +81,10 @@ FIELD_RESERVED_VALUE(lv_permissions, lv_permissions_r, "", "read-only", "read-on
 FIELD_RESERVED_VALUE(lv_permissions, lv_permissions_r_override, "", "read-only-override", "read-only-override", "ro-override", "r-override", "R")
 FIELD_RESERVED_VALUE(lv_read_ahead, lv_read_ahead, "", &RESERVED(number_undef_64), "auto")
 
+/* Reserved values for SEG fields */
+FIELD_RESERVED_VALUE(cache_policy, cache_policy_undef, "", "undefined", "undefined")
+/* TODO the following 2 need STR_LIST support for reserved values
+FIELD_RESERVED_VALUE(cache_settings, cache_settings_default, "", "default", "default")
+FIELD_RESERVED_VALUE(cache_settings, cache_settings_undef, "", "undefined", "undefined") */
+
 /* *INDENT-ON* */

test/shell/lvcreate-cache.sh

@@ -230,6 +230,9 @@ lvcreate --type cache-pool -L10 $vg/cpool
 lvcreate --type cache -l 1 --cachepool $vg/cpool -n corigin $vg --cachepolicy mq --cachesettings migration_threshold=233
 dmsetup status | grep $vg
 dmsetup status | grep $vg-corigin | grep 'migration_threshold 233'
+lvchange -an $vg
+lvchange -ay $vg
+dmsetup status | grep $vg-corigin | grep 'migration_threshold 233'
 
 lvremove -f $vg
 

test/shell/lvs-cache.sh

@@ -0,0 +1,65 @@
+#!/bin/sh
+# Copyright (C) 2014 Red Hat, Inc. All rights reserved.
+#
+# This copyrighted material is made available to anyone wishing to use,
+# modify, copy, or redistribute it subject to the terms and conditions
+# of the GNU General Public License v.2.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software Foundation,
+# Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+# Exercise creation of cache and cache pool volumes
+
+# Full CLI uses  --type
+# Shorthand CLI uses -H | --cache
+
+. lib/inittest
+
+aux have_cache 1 3 0 || skip
+aux prepare_vg 5 8000
+
+lvcreate --type cache-pool -L10 $vg/cpool
+lvcreate --type cache -l 1 --cachepool $vg/cpool -n corigin $vg
+lvs -o lv_name,cache_policy
+lvs -o lv_name,cache_settings
+
+lvremove -f $vg
+
+lvcreate --type cache-pool -L10 $vg/cpool
+lvcreate --type cache -l 1 --cachepool $vg/cpool -n corigin $vg --cachepolicy mq \
+	 --cachesettings migration_threshold=233
+lvs -o lv_name,cache_policy   | grep mq
+lvs -o lv_name,cache_settings | grep migration_threshold=233
+
+lvremove -f $vg
+
+lvcreate --type cache-pool -L10 --cachepolicy mq --cachesettings migration_threshold=233 $vg/cpool
+lvcreate --type cache -l 1 --cachepool $vg/cpool -n corigin $vg
+lvs -o lv_name,cache_policy   | grep mq
+lvs -o lv_name,cache_settings | grep migration_threshold=233
+
+lvremove -f $vg
+
+lvcreate --type cache-pool -L10 --cachepolicy mq --cachesettings migration_threshold=233 --cachesettings sequential_threshold=13 $vg/cpool
+lvcreate --type cache -l 1 --cachepool $vg/cpool -n corigin $vg
+lvs -o lv_name,cache_policy   | grep mq
+lvs -a -o lv_name,cache_policy -S 'cache_policy=mq' | grep corigin
+lvs -o lv_name,cache_settings | grep migration_threshold=233
+lvs -o lv_name,cache_settings | grep sequential_threshold=13
+
+lvcreate -n foo -l 1 $vg
+lvs -S 'cache_policy=mq' | grep corigin
+lvs -S 'cache_policy=mq' | not grep foo
+lvs -S 'cache_policy=undefined' | not grep corigin
+lvs -S 'cache_policy=undefined' | grep foo
+lvs -o +cache_policy -S 'cache_policy=mq' | grep corigin
+lvs -o +cache_policy -S 'cache_policy=mq' | not grep foo
+lvs -o +cache_policy -S 'cache_policy=undefined' | not grep corigin
+lvs -o +cache_policy -S 'cache_policy=undefined' | grep foo
+lvs -o +cache_policy -O cache_policy
+
+lvremove -f $vg
+
+lvcreate -n foo -l 1 $vg
+lvs -a -S 'cache_policy=undefined' | grep foo