pvck: dump headers_only to skip metadata text

pvck --dump headers reads the metadata text area
to compute the text metadata checksum to compare
with the mda_header checksum.
The new header_only will skip reading the metadata
text and not validate the mda_header checksum.

3 files changed, 12 insertions, 3 deletions

diff --git a/tools/lvmcmdline.c b/tools/lvmcmdline.c
index d87a8f053..608653827 100644
--- a/tools/lvmcmdline.c
+++ b/tools/lvmcmdline.c
@@ -1092,6 +1092,7 @@ int repairtype_arg(struct cmd_context *cmd, struct arg_values *av)
 int dumptype_arg(struct cmd_context *cmd, struct arg_values *av)
 {
 	if (!strcmp(av->value, "headers") ||
+	    !strcmp(av->value, "headers_only") ||
 	    !strcmp(av->value, "metadata") ||
 	    !strcmp(av->value, "metadata_all") ||
 	    !strcmp(av->value, "metadata_search") ||
diff --git a/tools/pvck.c b/tools/pvck.c
index a0f567eeb..cd2c5b6d4 100644
--- a/tools/pvck.c
+++ b/tools/pvck.c
@@ -24,6 +24,7 @@
 
 #define PRINT_CURRENT 1
 #define PRINT_ALL 2
+#define PRINT_NONE 3
 
 #define ID_STR_SIZE 40 /* uuid formatted with dashes is 38 chars */
 
@@ -1388,6 +1389,7 @@ static int _dump_headers(struct cmd_context *cmd, const char *dump, struct setti
 {
 	uint64_t mda1_offset = 0, mda1_size = 0, mda2_offset = 0, mda2_size = 0; /* bytes */
 	uint32_t mda1_checksum, mda2_checksum;
+	int print_metadata = 0;
 	int mda_count = 0;
 	int bad = 0;
 
@@ -1400,14 +1402,17 @@ static int _dump_headers(struct cmd_context *cmd, const char *dump, struct setti
 		return 1;
 	}
 
+	if (!strcmp(dump, "headers_only"))
+		print_metadata = PRINT_NONE;
+
 	/*
 	 * The first mda is always 4096 bytes from the start of the device.
 	 */
-	if (!_dump_mda_header(cmd, set, 1, 0, 0, NULL, dev, def, 4096, mda1_size, &mda1_checksum, NULL))
+	if (!_dump_mda_header(cmd, set, 1, print_metadata, 0, NULL, dev, def, 4096, mda1_size, &mda1_checksum, NULL))
 		bad++;
 
 	if (mda2_offset) {
-		if (!_dump_mda_header(cmd, set, 1, 0, 0, NULL, dev, def, mda2_offset, mda2_size, &mda2_checksum, NULL))
+		if (!_dump_mda_header(cmd, set, 1, print_metadata, 0, NULL, dev, def, mda2_offset, mda2_size, &mda2_checksum, NULL))
 			bad++;
 
 		/* This probably indicates that one was committed and the other not. */
@@ -3083,6 +3088,9 @@ int pvck(struct cmd_context *cmd, int argc, char **argv)
 		else if (!strcmp(dump, "headers"))
 			ret = _dump_headers(cmd, dump, &set, labelsector, dev, def);
 
+		else if (!strcmp(dump, "headers_only"))
+			ret = _dump_headers(cmd, dump, &set, labelsector, dev, def);
+
 		else if (!strcmp(dump, "backup_to_raw")) {
 			ret = _dump_backup_to_raw(cmd, &set);
 
diff --git a/tools/vals.h b/tools/vals.h
index 70404436b..623859e4d 100644
--- a/tools/vals.h
+++ b/tools/vals.h
@@ -142,7 +142,7 @@ val(reportformat_VAL, reportformat_arg, "ReportFmt", "basic|json")
 val(configreport_VAL, configreport_arg, "ConfigReport", "log|vg|lv|pv|pvseg|seg")
 val(configtype_VAL, configtype_arg, "ConfigType", "current|default|diff|full|list|missing|new|profilable|profilable-command|profilable-metadata")
 val(repairtype_VAL, repairtype_arg, "RepairType", "pv_header|metadata|label_header")
-val(dumptype_VAL, dumptype_arg, "DumpType", "headers|metadata|metadata_all|metadata_search")
+val(dumptype_VAL, dumptype_arg, "DumpType", "headers|headers_only|metadata|metadata_all|metadata_search")
 
 /* this should always be last */
 val(VAL_COUNT, NULL, NULL, NULL)