cache: allow to specify cachemetadataformat

OO_LVCREATE_CACHE accepts --cachemetadataformat.

Support new option --cachemetadataformat auto|1|2 for caching.
Word 'auto' can be also be given as '0'.

tools/args.h

@@ -102,6 +102,9 @@ arg(cache_long_ARG, '\0', "cache", 0, 0, 0,
     "#lvscan\n"
     "Scan the devices used by an LV and send the metadata to lvmetad.\n")
 
+arg(cachemetadataformat_ARG, '\0', "cachemetadataformat", cachemetadataformat_VAL, 0, 0,
+    "Specifies the cache metadata format used by cache target.\n")
+
 arg(cachemode_ARG, '\0', "cachemode", cachemode_VAL, 0, 0,
     "Specifies when writes to a cache LV should be considered complete.\n"
     "\\fBwriteback\\fP considers a write complete as soon as it is\n"

tools/command-lines.in

@@ -311,7 +311,8 @@ OO_LVCONVERT_POOL: --poolmetadata LV, --poolmetadatasize SizeMB,
 --poolmetadataspare Bool, --readahead Readahead, --chunksize SizeKB,
 --zero Bool, --metadataprofile String
 
-OO_LVCONVERT_CACHE: --cachemode CacheMode, --cachepolicy String,
+OO_LVCONVERT_CACHE: --cachemetadataformat CacheMetadataFormat,
+--cachemode CacheMode, --cachepolicy String,
 --cachesettings String, --zero Bool
 
 OO_LVCONVERT: --alloc Alloc, --background, --force, --noudevsync
@@ -702,7 +703,7 @@ OO_LVCREATE: --addtag Tag, --alloc Alloc, --autobackup Bool, --activate Active,
 --zero Bool
 
 OO_LVCREATE_CACHE: --cachemode CacheMode, --cachepolicy String, --cachesettings String,
---chunksize SizeKB
+--chunksize SizeKB, --cachemetadataformat CacheMetadataFormat
 
 OO_LVCREATE_POOL: --poolmetadatasize SizeMB, --poolmetadataspare Bool, --chunksize SizeKB
 

tools/command.c

@@ -70,6 +70,7 @@ struct arg_values;
 /* needed to include args.h */
 static inline int yes_no_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }
 static inline int activation_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }
+static inline int cachemetadataformat_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }
 static inline int cachemode_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }
 static inline int discards_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }
 static inline int mirrorlog_arg(struct cmd_context *cmd, struct arg_values *av) { return 0; }

tools/lvmcmdline.c

@@ -421,6 +421,25 @@ int cachemode_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_va
 	return 1;
 }
 
+int cachemetadataformat_arg(struct cmd_context *cmd, struct arg_values *av)
+{
+	if (!strcmp(av->value, "auto")) {
+		av->i_value = CACHE_METADATA_FORMAT_UNSELECTED;
+		av->ui_value = CACHE_METADATA_FORMAT_UNSELECTED;
+	} else if (!int_arg(cmd, av))
+		return_0;
+
+	switch (av->i_value) {
+	case CACHE_METADATA_FORMAT_UNSELECTED:
+	case CACHE_METADATA_FORMAT_1:
+	case CACHE_METADATA_FORMAT_2:
+		return 1;
+	}
+
+	log_error("Selected cache metadata format %d is not supported.", av->i_value);
+	return 0;
+}
+
 int discards_arg(struct cmd_context *cmd __attribute__((unused)), struct arg_values *av)
 {
 	thin_discards_t discards;

tools/tools.h

@@ -144,6 +144,7 @@ void usage(const char *name);
 /* the argument verify/normalise functions */
 int yes_no_arg(struct cmd_context *cmd, struct arg_values *av);
 int activation_arg(struct cmd_context *cmd, struct arg_values *av);
+int cachemetadataformat_arg(struct cmd_context *cmd, struct arg_values *av);
 int cachemode_arg(struct cmd_context *cmd, struct arg_values *av);
 int discards_arg(struct cmd_context *cmd, struct arg_values *av);
 int mirrorlog_arg(struct cmd_context *cmd, struct arg_values *av);

tools/vals.h

@@ -108,6 +108,7 @@ val(tag_VAL, tag_arg, "Tag", NULL)
 val(select_VAL, NULL, "Select", NULL)       /* used only for command defs */
 val(activationmode_VAL, string_arg, "ActivationMode", "partial|degraded|complete")
 val(activation_VAL, activation_arg, "Active", "y|n|ay")
+val(cachemetadataformat_VAL, cachemetadataformat_arg, "CacheMetadataFormat", "auto|1|2")
 val(cachemode_VAL, cachemode_arg, "CacheMode", "writethrough|writeback|passthrough")
 val(discards_VAL, discards_arg, "Discards", "passdown|nopassdown|ignore")
 val(mirrorlog_VAL, mirrorlog_arg, "MirrorLog", "core|disk")