btrfs: extend btrfs_dir_item type to store encryption status

For directories with encrypted files/filenames, we need to store a flag
indicating this fact. There's no room in other fields, so we'll need to
borrow a bit from dir_type. Since it's now a combination of type and
flags, we rename it to dir_flags to reflect its new usage.

The new flag, FT_ENCRYPTED, indicates a directory containing encrypted
data, which is orthogonal to file type; therefore, add the new
flag, and make conversion from directory type to file type strip the
flag.

As the file types almost never change we can afford to use the bits.
Actual usage will be guarded behind an incompat bit, this patch only
adds the support for later use by fscrypt.

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

1 files changed, 10 insertions, 10 deletions

diff --git a/fs/btrfs/tree-log.c b/fs/btrfs/tree-log.c
index 7002cc3315da..a5e56a678af2 100644
--- a/fs/btrfs/tree-log.c
+++ b/fs/btrfs/tree-log.c
@@ -1799,7 +1799,7 @@ static int delete_conflicting_dir_entry(struct btrfs_trans_handle *trans,
 					struct btrfs_path *path,
 					struct btrfs_dir_item *dst_di,
 					const struct btrfs_key *log_key,
-					u8 log_type,
+					u8 log_flags,
 					bool exists)
 {
 	struct btrfs_key found_key;
@@ -1809,7 +1809,7 @@ static int delete_conflicting_dir_entry(struct btrfs_trans_handle *trans,
 	if (found_key.objectid == log_key->objectid &&
 	    found_key.type == log_key->type &&
 	    found_key.offset == log_key->offset &&
-	    btrfs_dir_type(path->nodes[0], dst_di) == log_type)
+	    btrfs_dir_flags(path->nodes[0], dst_di) == log_flags)
 		return 1;
 
 	/*
@@ -1853,7 +1853,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
 	struct btrfs_key log_key;
 	struct btrfs_key search_key;
 	struct inode *dir;
-	u8 log_type;
+	u8 log_flags;
 	bool exists;
 	int ret;
 	bool update_size = true;
@@ -1867,7 +1867,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
 	if (ret)
 		goto out;
 
-	log_type = btrfs_dir_type(eb, di);
+	log_flags = btrfs_dir_flags(eb, di);
 	btrfs_dir_item_key_to_cpu(eb, di, &log_key);
 	ret = btrfs_lookup_inode(trans, root, path, &log_key, 0);
 	btrfs_release_path(path);
@@ -1883,8 +1883,8 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
 		goto out;
 	} else if (dir_dst_di) {
 		ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path,
-						   dir_dst_di, &log_key, log_type,
-						   exists);
+						   dir_dst_di, &log_key,
+						   log_flags, exists);
 		if (ret < 0)
 			goto out;
 		dir_dst_matches = (ret == 1);
@@ -1901,7 +1901,7 @@ static noinline int replay_one_name(struct btrfs_trans_handle *trans,
 	} else if (index_dst_di) {
 		ret = delete_conflicting_dir_entry(trans, BTRFS_I(dir), path,
 						   index_dst_di, &log_key,
-						   log_type, exists);
+						   log_flags, exists);
 		if (ret < 0)
 			goto out;
 		index_dst_matches = (ret == 1);
@@ -2010,7 +2010,7 @@ static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans,
 	 * to ever delete the parent directory has it would result in stale
 	 * dentries that can never be deleted.
 	 */
-	if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) {
+	if (ret == 1 && btrfs_dir_ftype(eb, di) != BTRFS_FT_DIR) {
 		struct btrfs_path *fixup_path;
 		struct btrfs_key di_key;
 
@@ -5452,7 +5452,7 @@ again:
 			}
 
 			di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item);
-			type = btrfs_dir_type(leaf, di);
+			type = btrfs_dir_ftype(leaf, di);
 			if (btrfs_dir_transid(leaf, di) < trans->transid)
 				continue;
 			btrfs_dir_item_key_to_cpu(leaf, di, &di_key);
@@ -6292,7 +6292,7 @@ static int log_new_delayed_dentries(struct btrfs_trans_handle *trans,
 			continue;
 		}
 
-		if (btrfs_stack_dir_type(dir_item) == BTRFS_FT_DIR)
+		if (btrfs_stack_dir_ftype(dir_item) == BTRFS_FT_DIR)
 			log_mode = LOG_INODE_ALL;
 
 		ctx->log_new_dentries = false;