[PATCH v3 2/7] btrfs-progs: start tracking extent encryption context info

[Daniel Vacek <neelx@suse.com>]

From: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>

This recapitulates the kernel change named 'btrfs: start tracking extent
encryption context info".

Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
Signed-off-by: Daniel Vacek <neelx@suse.com>
---
 kernel-shared/tree-checker.c    | 17 ++++++++++-------
 kernel-shared/uapi/btrfs_tree.h |  6 ++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/kernel-shared/tree-checker.c b/kernel-shared/tree-checker.c
index 5e716422..cd3d5d27 100644
--- a/kernel-shared/tree-checker.c
+++ b/kernel-shared/tree-checker.c
@@ -239,6 +239,8 @@ static int check_extent_data_item(struct extent_buffer *leaf,
 	u32 sectorsize = fs_info->sectorsize;
 	u32 item_size = btrfs_item_size(leaf, slot);
 	u64 extent_end;
+	u8 policy;
+	u8 fe_type;
 
 	if (unlikely(!IS_ALIGNED(key->offset, sectorsize))) {
 		file_extent_err(leaf, slot,
@@ -269,12 +271,12 @@ static int check_extent_data_item(struct extent_buffer *leaf,
 				SZ_4K);
 		return -EUCLEAN;
 	}
-	if (unlikely(btrfs_file_extent_type(leaf, fi) >=
-		     BTRFS_NR_FILE_EXTENT_TYPES)) {
+
+	fe_type = btrfs_file_extent_type(leaf, fi);
+	if (unlikely(fe_type >= BTRFS_NR_FILE_EXTENT_TYPES)) {
 		file_extent_err(leaf, slot,
 		"invalid type for file extent, have %u expect range [0, %u]",
-			btrfs_file_extent_type(leaf, fi),
-			BTRFS_NR_FILE_EXTENT_TYPES - 1);
+			fe_type, BTRFS_NR_FILE_EXTENT_TYPES - 1);
 		return -EUCLEAN;
 	}
 
@@ -290,10 +292,11 @@ static int check_extent_data_item(struct extent_buffer *leaf,
 			BTRFS_NR_COMPRESS_TYPES - 1);
 		return -EUCLEAN;
 	}
-	if (unlikely(btrfs_file_extent_encryption(leaf, fi))) {
+	policy = btrfs_file_extent_encryption(leaf, fi);
+	if (unlikely(policy >= BTRFS_NR_ENCRYPTION_TYPES)) {
 		file_extent_err(leaf, slot,
-			"invalid encryption for file extent, have %u expect 0",
-			btrfs_file_extent_encryption(leaf, fi));
+			"invalid encryption for file extent, have %u expect range [0, %u]",
+			policy, BTRFS_NR_ENCRYPTION_TYPES - 1);
 		return -EUCLEAN;
 	}
 	if (btrfs_file_extent_type(leaf, fi) == BTRFS_FILE_EXTENT_INLINE) {
diff --git a/kernel-shared/uapi/btrfs_tree.h b/kernel-shared/uapi/btrfs_tree.h
index 1ca63711..74d307f1 100644
--- a/kernel-shared/uapi/btrfs_tree.h
+++ b/kernel-shared/uapi/btrfs_tree.h
@@ -1072,6 +1072,12 @@ enum {
 	BTRFS_NR_FILE_EXTENT_TYPES = 3,
 };
 
+enum {
+	BTRFS_ENCRYPTION_NONE,
+	BTRFS_ENCRYPTION_FSCRYPT,
+	BTRFS_NR_ENCRYPTION_TYPES,
+};
+
 struct btrfs_file_extent_item {
 	/*
 	 * transaction id that created this extent
-- 
2.53.0