[v2,1/2] btrfs-progs: Add human readable flags output string for extent flags.

Commit Message

Qu Wenruo June 12, 2014, 7:12 a.m. UTC

Current btrfs-debug-tree outputs extent flags as numbers,
which makes it hard to understand and need to check the source to
understand the meaning.

This patch will convert numberic flags output to human readable strings.

Signed-off-by: Qu Wenruo <[e-mail]>
---
changlog:
v2: none
---
 print-tree.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

Patch

diff --git a/print-tree.c b/print-tree.c
index 7263b09..7f831ad 100644
--- a/print-tree.c
+++ b/print-tree.c
@@ -242,6 +242,25 @@  static void print_file_extent_item(struct extent_buffer *eb,
 	       btrfs_file_extent_compression(eb, fi));
 }
 
+/* Caller should ensure sizeof(*ret) >= 16("DATA|TREE_BLOCK") */
+static void extent_flags_to_str(u64 flags, char *ret)
+{
+	int empty = 1;
+
+	if (flags & BTRFS_EXTENT_FLAG_DATA) {
+		empty = 0;
+		strcpy(ret, "DATA");
+	}
+	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
+		if (!empty) {
+			empty = 0;
+			strcat(ret, "|");
+		}
+		strcat(ret, "TREE_BLOCK");
+	}
+	return;
+}
+
 static void print_extent_item(struct extent_buffer *eb, int slot, int metadata)
 {
 	struct btrfs_extent_item *ei;
@@ -255,6 +274,7 @@  static void print_extent_item(struct extent_buffer *eb, int slot, int metadata)
 	u32 item_size = btrfs_item_size_nr(eb, slot);
 	u64 flags;
 	u64 offset;
+	char flags_str[32] = {0};
 
 	if (item_size < sizeof(*ei)) {
 #ifdef BTRFS_COMPAT_EXTENT_TREE_V0
@@ -271,11 +291,12 @@  static void print_extent_item(struct extent_buffer *eb, int slot, int metadata)
 
 	ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
 	flags = btrfs_extent_flags(eb, ei);
+	extent_flags_to_str(flags, flags_str);
 
-	printf("\t\textent refs %llu gen %llu flags %llu\n",
+	printf("\t\textent refs %llu gen %llu flags %s\n",
 	       (unsigned long long)btrfs_extent_refs(eb, ei),
 	       (unsigned long long)btrfs_extent_generation(eb, ei),
-	       (unsigned long long)flags);
+	       flags_str);
 
 	if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK && !metadata) {
 		struct btrfs_tree_block_info *info;