[PATCH v2 6/8] btrfs-progs: handle fscrypt context items

From: Sweet Tea Dorminy <[email protected]>

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 <[email protected]>
Signed-off-by: Daniel Vacek <[email protected]>
---
 check/main.c                    |  2 ++
 kernel-shared/print-tree.c      | 20 ++++++++++++++++++++
 kernel-shared/uapi/btrfs_tree.h |  3 ++-
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/check/main.c b/check/main.c
index a32247b3..2df55edc 100644
--- a/check/main.c
+++ b/check/main.c
@@ -1896,6 +1896,8 @@ static int process_one_leaf(struct btrfs_root *root, struct extent_buffer *eb,
 			break;
 		case BTRFS_VERITY_DESC_ITEM_KEY:
 		case BTRFS_VERITY_MERKLE_ITEM_KEY:
+		case BTRFS_FSCRYPT_INODE_CTX_KEY:
+		case BTRFS_FSCRYPT_CTX_KEY:
 			break;
 		default:
 			error("unknown key (%llu %u %llu) found in leaf %llu",
diff --git a/kernel-shared/print-tree.c b/kernel-shared/print-tree.c
index 159f0825..d68398e9 100644
--- a/kernel-shared/print-tree.c
+++ b/kernel-shared/print-tree.c
@@ -117,6 +117,20 @@ static void print_dir_item(struct extent_buffer *eb, u32 size,
 	}
 }
 
+static void print_fscrypt_context(struct extent_buffer *eb, int slot)
+{
+	int i;
+	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(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)
 {
@@ -740,6 +754,8 @@ 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_INODE_CTX_KEY]   = "FSCRYPT_INODE_CTX",
+		[BTRFS_FSCRYPT_CTX_KEY]         = "FSCRYPT_CTX",
 		[BTRFS_VERITY_DESC_ITEM_KEY]	= "VERITY_DESC_ITEM",
 		[BTRFS_VERITY_MERKLE_ITEM_KEY]	= "VERITY_MERKLE_ITEM",
 		[BTRFS_ORPHAN_ITEM_KEY]		= "ORPHAN_ITEM",
@@ -1556,6 +1572,10 @@ 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_INODE_CTX_KEY:
+		case BTRFS_FSCRYPT_CTX_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;
diff --git a/kernel-shared/uapi/btrfs_tree.h b/kernel-shared/uapi/btrfs_tree.h
index 45675dae..b4532237 100644
--- a/kernel-shared/uapi/btrfs_tree.h
+++ b/kernel-shared/uapi/btrfs_tree.h
@@ -168,7 +168,8 @@
 #define BTRFS_VERITY_DESC_ITEM_KEY	36
 #define BTRFS_VERITY_MERKLE_ITEM_KEY	37
 
-#define BTRFS_FSCRYPT_CTXT_ITEM_KEY	41
+#define BTRFS_FSCRYPT_INODE_CTX_KEY	41
+#define BTRFS_FSCRYPT_CTX_KEY		42
 
 #define BTRFS_ORPHAN_ITEM_KEY		48
 /* reserve 2-15 close to the inode for later flexibility */
-- 
2.53.0