btrfs-progs: add command group info strings

They're printed in the 'btrfs' command group summary.

Signed-off-by: David Sterba <dsterba@suse.cz>

cmds-balance.c

@@ -723,8 +723,11 @@ static int cmd_balance_status(int argc, char **argv)
 	return 1;
 }
 
+static const char balance_cmd_group_info[] =
+"balance data accross devices, or change block groups using filters";
+
 const struct cmd_group balance_cmd_group = {
-	balance_cmd_group_usage, NULL, {
+	balance_cmd_group_usage, balance_cmd_group_info, {
 		{ "start", cmd_balance_start, cmd_balance_start_usage, NULL, 0 },
 		{ "pause", cmd_balance_pause, cmd_balance_pause_usage, NULL, 0 },
 		{ "cancel", cmd_balance_cancel, cmd_balance_cancel_usage, NULL, 0 },

cmds-device.c

@@ -583,8 +583,11 @@ out:
 	return !!ret;
 }
 
+static const char device_cmd_group_info[] =
+"manage and query devices in the filesystem";
+
 const struct cmd_group device_cmd_group = {
-	device_cmd_group_usage, NULL, {
+	device_cmd_group_usage, device_cmd_group_info, {
 		{ "add", cmd_add_dev, cmd_add_dev_usage, NULL, 0 },
 		{ "delete", cmd_rm_dev, cmd_rm_dev_usage, NULL, 0 },
 		{ "scan", cmd_scan_dev, cmd_scan_dev_usage, NULL, 0 },

cmds-filesystem.c

@@ -1321,8 +1321,11 @@ static int cmd_label(int argc, char **argv)
 	}
 }
 
+static const char filesystem_cmd_group_info[] =
+"overall filesystem tasks and information";
+
 const struct cmd_group filesystem_cmd_group = {
-	filesystem_cmd_group_usage, NULL, {
+	filesystem_cmd_group_usage, filesystem_cmd_group_info, {
 		{ "df", cmd_filesystem_df, cmd_filesystem_df_usage, NULL, 0 },
 		{ "show", cmd_show, cmd_show_usage, NULL, 0 },
 		{ "sync", cmd_sync, cmd_sync_usage, NULL, 0 },

cmds-inspect.c

@@ -338,8 +338,11 @@ out:
 	return !!ret;
 }
 
+static const char inspect_cmd_group_info[] =
+"query various internal information";
+
 const struct cmd_group inspect_cmd_group = {
-	inspect_cmd_group_usage, NULL, {
+	inspect_cmd_group_usage, inspect_cmd_group_info, {
 		{ "inode-resolve", cmd_inode_resolve, cmd_inode_resolve_usage,
 			NULL, 0 },
 		{ "logical-resolve", cmd_logical_resolve,

cmds-property.c

@@ -460,8 +460,11 @@ static int cmd_list(int argc, char **argv)
 	return ret;
 }
 
+static const char property_cmd_group_info[] =
+"modify properties of filesystem objects";
+
 const struct cmd_group property_cmd_group = {
-	property_cmd_group_usage, NULL, {
+	property_cmd_group_usage, property_cmd_group_info, {
 		{ "get", cmd_get, cmd_get_usage, NULL, 0 },
 		{ "set", cmd_set, cmd_set_usage, NULL, 0 },
 		{ "list", cmd_list, cmd_list_usage, NULL, 0 },

cmds-qgroup.c

@@ -465,8 +465,11 @@ static int cmd_qgroup_limit(int argc, char **argv)
 	return 0;
 }
 
+static const char qgroup_cmd_group_info[] =
+"manage quota groups";
+
 const struct cmd_group qgroup_cmd_group = {
-	qgroup_cmd_group_usage, NULL, {
+	qgroup_cmd_group_usage, qgroup_cmd_group_info, {
 		{ "assign", cmd_qgroup_assign, cmd_qgroup_assign_usage,
 		   NULL, 0 },
 		{ "remove", cmd_qgroup_remove, cmd_qgroup_remove_usage,

cmds-quota.c

@@ -176,8 +176,11 @@ static int cmd_quota_rescan(int argc, char **argv)
 	return 0;
 }
 
+static const char quota_cmd_group_info[] =
+"manage filesystem quota settings";
+
 const struct cmd_group quota_cmd_group = {
-	quota_cmd_group_usage, NULL, {
+	quota_cmd_group_usage, quota_cmd_group_info, {
 		{ "enable", cmd_quota_enable, cmd_quota_enable_usage, NULL, 0 },
 		{ "disable", cmd_quota_disable, cmd_quota_disable_usage,
 		   NULL, 0 },

cmds-replace.c

@@ -567,8 +567,11 @@ static int cmd_cancel_replace(int argc, char **argv)
 	return 0;
 }
 
+static const char replace_cmd_group_info[] =
+"replace a device in the filesystem";
+
 const struct cmd_group replace_cmd_group = {
-	replace_cmd_group_usage, NULL, {
+	replace_cmd_group_usage, replace_cmd_group_info, {
 		{ "start", cmd_start_replace, cmd_start_replace_usage, NULL,
 		  0 },
 		{ "status", cmd_status_replace, cmd_status_replace_usage, NULL,

cmds-rescue.c

@@ -201,8 +201,11 @@ out:
 	return !!ret;
 }
 
+static const char rescue_cmd_group_info[] =
+"toolbox for specific rescue operations";
+
 const struct cmd_group rescue_cmd_group = {
-	rescue_cmd_group_usage, NULL, {
+	rescue_cmd_group_usage, rescue_cmd_group_info, {
 		{ "chunk-recover", cmd_chunk_recover, cmd_chunk_recover_usage, NULL, 0},
 		{ "super-recover", cmd_super_recover, cmd_super_recover_usage, NULL, 0},
 		{ "zero-log", cmd_rescue_zero_log, cmd_rescue_zero_log_usage, NULL, 0},

cmds-scrub.c

@@ -1804,8 +1804,11 @@ out:
 	return !!err;
 }
 
+static const char scrub_cmd_group_info[] =
+"verify checksums of data and metadata";
+
 const struct cmd_group scrub_cmd_group = {
-	scrub_cmd_group_usage, NULL, {
+	scrub_cmd_group_usage, scrub_cmd_group_info, {
 		{ "start", cmd_scrub_start, cmd_scrub_start_usage, NULL, 0 },
 		{ "cancel", cmd_scrub_cancel, cmd_scrub_cancel_usage, NULL, 0 },
 		{ "resume", cmd_scrub_resume, cmd_scrub_resume_usage, NULL, 0 },

cmds-subvolume.c

@@ -1254,8 +1254,11 @@ out:
 	return !!ret;
 }
 
+static const char subvolume_cmd_group_info[] =
+"manage subvolumes: create, delete, list, etc";
+
 const struct cmd_group subvolume_cmd_group = {
-	subvolume_cmd_group_usage, NULL, {
+	subvolume_cmd_group_usage, subvolume_cmd_group_info, {
 		{ "create", cmd_subvol_create, cmd_subvol_create_usage, NULL, 0 },
 		{ "delete", cmd_subvol_delete, cmd_subvol_delete_usage, NULL, 0 },
 		{ "list", cmd_subvol_list, cmd_subvol_list_usage, NULL, 0 },