btrfs-progs: print-tree: use readable_flag_entry for inode flags

The current print-tree can not handle unsupported inode flags, e.g.
created by Synology's out-of-tree btrfs implementation.

The existing one just checks all the supported flags, and if no flag
hits, it will output "none" no matter if there is any unsupported one.

Fix this by implementing sprint_readable_flag(), and use the same
handling of print_readable_flag().
Although for inode flag, adds one extra handling to output "none" if no
flag hit at all.

Signed-off-by: Qu Wenruo <wqu@suse.com>

kernel-shared/print-tree.c

@@ -183,9 +183,43 @@ static void print_inode_ref_item(struct extent_buffer *eb, u32 size,
 	}
 }
 
+struct readable_flag_entry {
+	u64 bit;
+	char *output;
+};
+
 /* The minimal length for the string buffer of block group/chunk flags */
 #define BG_FLAG_STRING_LEN	64
 
+static void sprint_readable_flag(char *restrict dest, u64 flag,
+				 struct readable_flag_entry *array,
+				 int array_size)
+{
+	int i;
+	u64 supported_flags = 0;
+	int cur = 0;
+
+	dest[0] = '\0';
+	for (i = 0; i < array_size; i++)
+		supported_flags |= array[i].bit;
+
+	for (i = 0; i < array_size; i++) {
+		struct readable_flag_entry *entry = array + i;
+
+		if ((flag & supported_flags) && (flag & entry->bit)) {
+			if (dest[0])
+				cur += sprintf(dest + cur, "|");
+			cur += sprintf(dest + cur, "%s", entry->output);
+		}
+	}
+	flag &= ~supported_flags;
+	if (flag) {
+		if (dest[0])
+			cur += sprintf(dest + cur, "|");
+		cur += sprintf(dest + cur, "UNKNOWN: 0x%llx", flag);
+	}
+}
+
 static void bg_flags_to_str(u64 flags, char *ret)
 {
 	int empty = 1;
@@ -932,37 +966,35 @@ static void print_uuid_item(struct extent_buffer *l, unsigned long offset,
 	}
 }
 
-/* Btrfs inode flag stringification helper */
-#define STRCAT_ONE_INODE_FLAG(flags, name, empty, dst) ({			\
-	if (flags & BTRFS_INODE_##name) {				\
-		if (!empty)						\
-			strcat(dst, "|");				\
-		strcat(dst, #name);					\
-		empty = 0;						\
-	}								\
-})
+#define DEF_INODE_FLAG_ENTRY(name)			\
+	{ BTRFS_INODE_##name, #name }
+
+static struct readable_flag_entry inode_flags_array[] = {
+	DEF_INODE_FLAG_ENTRY(NODATASUM),
+	DEF_INODE_FLAG_ENTRY(NODATACOW),
+	DEF_INODE_FLAG_ENTRY(READONLY),
+	DEF_INODE_FLAG_ENTRY(NOCOMPRESS),
+	DEF_INODE_FLAG_ENTRY(PREALLOC),
+	DEF_INODE_FLAG_ENTRY(SYNC),
+	DEF_INODE_FLAG_ENTRY(IMMUTABLE),
+	DEF_INODE_FLAG_ENTRY(APPEND),
+	DEF_INODE_FLAG_ENTRY(NODUMP),
+	DEF_INODE_FLAG_ENTRY(NOATIME),
+	DEF_INODE_FLAG_ENTRY(DIRSYNC),
+	DEF_INODE_FLAG_ENTRY(COMPRESS),
+	DEF_INODE_FLAG_ENTRY(ROOT_ITEM_INIT),
+};
+static const int inode_flags_num = ARRAY_SIZE(inode_flags_array);
 
 /*
- * Caller should ensure sizeof(*ret) >= 102: all characters plus '|' of
- * BTRFS_INODE_* flags
+ * Caller should ensure sizeof(*ret) >= 129: all characters plus '|' of
+ * BTRFS_INODE_* flags + "UNKNOWN: 0xffffffffffffffff"
  */
 static void inode_flags_to_str(u64 flags, char *ret)
 {
-	int empty = 1;
-
-	STRCAT_ONE_INODE_FLAG(flags, NODATASUM, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, NODATACOW, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, READONLY, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, NOCOMPRESS, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, PREALLOC, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, SYNC, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, IMMUTABLE, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, APPEND, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, NODUMP, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, NOATIME, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, DIRSYNC, empty, ret);
-	STRCAT_ONE_INODE_FLAG(flags, COMPRESS, empty, ret);
-	if (empty)
+	sprint_readable_flag(ret, flags, inode_flags_array, inode_flags_num);
+	/* No flag hit at all, set the output to "none"*/
+	if (!ret[0])
 		strcat(ret, "none");
 }
 
@@ -1876,11 +1908,6 @@ static int check_csum_sblock(void *sb, int csum_size, u16 csum_type)
 	return !memcmp(sb, result, csum_size);
 }
 
-struct readable_flag_entry {
-	u64 bit;
-	char *output;
-};
-
 #define DEF_COMPAT_RO_FLAG_ENTRY(bit_name)		\
 	{BTRFS_FEATURE_COMPAT_RO_##bit_name, #bit_name}