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cache: support no_discard_passdown
Recent kernel version from kernel commit: de7180ff908b2bc0342e832dbdaa9a5f1ecaa33a started to report in cache status line new flag: no_discard_passdown Whenever lvm spots unknown status it reports: Unknown feature in status: So add reconginzing this feature flag and also report this with 'lvs -o+kernel_discards' When no_discard_passdown is found in status 'nopassdown' gets reported for this field (roughly matching what we report for thin-pools).
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@ -1,5 +1,6 @@
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Version 2.02.186 -
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================================
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Report no_discard_passdown for cache LVs with lvs -o+kernel_discards.
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Prevent shared active mirror LVs with lvmlockd.
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Version 2.02.185 - 13th May 2019
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@ -1,5 +1,6 @@
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Version 1.02.160 -
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================================
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Parsing of cache status understand no_discard_passdown.
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Version 1.02.158 - 13th May 2019
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================================
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@ -245,6 +245,11 @@ char *lvseg_kernel_discards_dup_with_info_and_seg_status(struct dm_pool *mem, co
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return 0;
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}
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s = get_pool_discards_name(d);
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} else if (lvdm->seg_status.type == SEG_STATUS_CACHE) {
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if (lvdm->seg_status.cache->feature_flags &
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DM_CACHE_FEATURE_NO_DISCARD_PASSDOWN) {
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s = "nopassdown";
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}
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}
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if (!(ret = dm_pool_strdup(mem, s))) {
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@ -1893,6 +1893,7 @@ int dm_tree_node_add_raid_target_with_params_v2(struct dm_tree_node *node,
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#define DM_CACHE_FEATURE_WRITETHROUGH 0x00000002
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#define DM_CACHE_FEATURE_PASSTHROUGH 0x00000004
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#define DM_CACHE_FEATURE_METADATA2 0x00000008 /* cache v1.10 */
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#define DM_CACHE_FEATURE_NO_DISCARD_PASSDOWN 0x00000010
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struct dm_config_node;
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/*
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@ -296,6 +296,8 @@ int dm_get_status_cache(struct dm_pool *mem, const char *params,
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s->feature_flags |= DM_CACHE_FEATURE_PASSTHROUGH;
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else if (!strncmp(p, "metadata2 ", 10))
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s->feature_flags |= DM_CACHE_FEATURE_METADATA2;
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else if (!strncmp(p, "no_discard_passdown ", 20))
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s->feature_flags |= DM_CACHE_FEATURE_NO_DISCARD_PASSDOWN;
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else
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log_error("Unknown feature in status: %s", params);
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