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btrfs-progs: dump-tree: simplify and fix check for empty uuid 

Counting non-zero bytes is wasteful, besides that it would not recognize
uuids containing a 00 value.

Signed-off-by: David Sterba <dsterba@suse.com>
master
David Sterba 2016-11-02 10:22:10 +01:00
parent 5082ec84a8
commit a15294f0c4
1 changed files with 8 additions and 9 deletions
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17
print-tree.c
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@ -516,15 +516,14 @@ static void print_root_ref(struct extent_buffer *leaf, int slot, char *tag)
namelen, namebuf);
}
static int count_bytes(void *buf, int len, char b)
static int empty_uuid(const u8 *uuid)
{
int cnt = 0;
int i;
for (i = 0; i < len; i++) {
if (((char*)buf)[i] == b)
cnt++;
}
return cnt;
for (i = 0; i < BTRFS_UUID_SIZE; i++)
if (uuid[i])
return 0;
return 1;
}
/*
@ -570,11 +569,11 @@ static void print_root(struct extent_buffer *leaf, int slot)
if (root_item.generation == root_item.generation_v2) {
uuid_unparse(root_item.uuid, uuid_str);
printf("\t\tuuid %s\n", uuid_str);
if (count_bytes(root_item.parent_uuid, BTRFS_UUID_SIZE, 0) != BTRFS_UUID_SIZE) {
if (!empty_uuid(root_item.parent_uuid)) {
uuid_unparse(root_item.parent_uuid, uuid_str);
printf("\t\tparent_uuid %s\n", uuid_str);
}
if (count_bytes(root_item.received_uuid, BTRFS_UUID_SIZE, 0) != BTRFS_UUID_SIZE) {
if (!empty_uuid(root_item.received_uuid)) {
uuid_unparse(root_item.received_uuid, uuid_str);
printf("\t\treceived_uuid %s\n", uuid_str);
}