btrfs-progs: print-tree: handle fscrypt context items

Encrypted inodes have a new associated item, the fscrypt context, which
can be printed as a pure hex string in dump-tree.

Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: sweettea

kernel-shared/print-tree.c

@@ -117,6 +117,19 @@ static void print_dir_item(struct extent_buffer *eb, u32 size,
 	}
 }
 
+static void print_fscrypt_context(struct extent_buffer *eb, int slot)
+{
+	unsigned long ptr = btrfs_item_ptr_offset(eb, slot);
+	u32 item_size = btrfs_item_size(eb, slot);
+	u8 ctx_buf[item_size];
+
+	read_extent_buffer(eb, ctx_buf, ptr, item_size);
+	printf("\t\tvalue: ");
+	for(int i = 0; i < item_size; i++)
+		printf("%02x", ctx_buf[i]);
+	printf("\n");
+}
+
 static void print_inode_extref_item(struct extent_buffer *eb, u32 size,
 		struct btrfs_inode_extref *extref)
 {
@@ -756,6 +769,7 @@ void print_key_type(FILE *stream, u64 objectid, u8 type)
 		[BTRFS_DIR_LOG_ITEM_KEY]	= "DIR_LOG_ITEM",
 		[BTRFS_DIR_LOG_INDEX_KEY]	= "DIR_LOG_INDEX",
 		[BTRFS_XATTR_ITEM_KEY]		= "XATTR_ITEM",
+		[BTRFS_FSCRYPT_CTXT_ITEM_KEY]   = "FSCRYPT_CTXT_ITEM",
 		[BTRFS_VERITY_DESC_ITEM_KEY]	= "VERITY_DESC_ITEM",
 		[BTRFS_VERITY_MERKLE_ITEM_KEY]	= "VERITY_MERKLE_ITEM",
 		[BTRFS_ORPHAN_ITEM_KEY]		= "ORPHAN_ITEM",
@@ -1566,6 +1580,9 @@ void __btrfs_print_leaf(struct extent_buffer *eb, unsigned int mode)
 		case BTRFS_XATTR_ITEM_KEY:
 			print_dir_item(eb, item_size, ptr);
 			break;
+		case BTRFS_FSCRYPT_CTXT_ITEM_KEY:
+			print_fscrypt_context(eb, i);
+			break;
 		case BTRFS_DIR_LOG_INDEX_KEY:
 		case BTRFS_DIR_LOG_ITEM_KEY: {
 			struct btrfs_dir_log_item *dlog;