Introduce set_prop_label(), get_prop_label(), print_prop_label()
to set/get/print label.
Signed-off-by: Su Yue <suy.f...@cn.fujitsu.com>
---
props.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
1 file changed, 55 insertions(+), 9 deletions(-)
diff --git a/props.c b/props.c
index da69f6e9314c..28a81b6bdc81 100644
--- a/props.c
+++ b/props.c
@@ -145,23 +145,68 @@ out:
return ret;
}
-static int prop_label(enum prop_object_type type,
- const char *object,
- const char *name,
- const char *value)
+static ssize_t prop_label(enum prop_object_type type, const char *object,
+ const char *name, char *value, enum prop_operation operation)
{
- int ret;
+ ssize_t ret;
- if (value) {
+ if (operation == set_prop) {
ret = set_label((char *) object, (char *) value);
} else {
char label[BTRFS_LABEL_SIZE];
ret = get_label((char *) object, label);
- if (!ret)
- fprintf(stdout, "label=%s\n", label);
+ if (ret)
+ goto out;
+
+ if (!value)
+ ret = strlen(label);
+ else
+ memcpy(value, label, strlen(label));
+ }
+out:
+ return ret;
+}
+
+static int set_prop_label(enum prop_object_type type, const char *object,
+ const char *name, const char *value)
+{
+ return prop_label(type, object, name, (char *)value, set_prop);
+}
+
+static ssize_t get_prop_label(enum prop_object_type type, const char *object,
+ const char *name, char *value)
+{
+ return prop_label(type, object, name, value, get_prop);
+}
+
+static int print_prop_label(enum prop_object_type type, const char *object,
+ const char *name)
+{
+ int ret;
+ ssize_t len;
+ char *value = NULL;
+
+ len = get_prop_label(type, object, name, NULL);
+ if (len < 0) {
+ ret = len;
+ goto out;
}
+ value = malloc(len + 1);
+ if (!value) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ ret = get_prop_label(type, object, name, value);
+ if (ret)
+ goto out;
+
+ value[len] = '\0';
+ printf("label=%s\n", value);
+out:
+ if (value)
+ free(value);
return ret;
}
@@ -243,7 +288,8 @@ const struct prop_handler prop_handlers[] = {
set_prop_read_only, get_prop_read_only, print_prop_read_only},
{"label", "Set/get label of device.", 0,
- prop_object_dev | prop_object_root, NULL, NULL, NULL},
+ prop_object_dev | prop_object_root,
+ set_prop_label, get_prop_label, print_prop_label},
{"compression", "Set/get compression for a file or directory", 0,
prop_object_inode, NULL, NULL, NULL},
--
2.15.0
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