btrfs: use struct fscrypt_str instead of struct qstr

While struct qstr is more natural without fscrypt, since it's provided
by dentries, struct fscrypt_str is provided by the fscrypt handlers
processing dentries, and is thus more natural in the fscrypt world.
Replace all of the struct qstr uses with struct fscrypt_str.

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, 34 insertions, 53 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index fa4b101bc1eba..7e76d5e917867 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4286,7 +4286,7 @@ int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans,
 static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans,
 				struct btrfs_inode *dir,
 				struct btrfs_inode *inode,
-				const struct qstr *name,
+				const struct fscrypt_str *name,
 				struct btrfs_rename_ctx *rename_ctx)
 {
 	struct btrfs_root *root = dir->root;
@@ -4389,7 +4389,7 @@ out:
 
 int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
 		       struct btrfs_inode *dir, struct btrfs_inode *inode,
-		       const struct qstr *name)
+		       const struct fscrypt_str *name)
 {
 	int ret;
 
@@ -4430,12 +4430,10 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 	struct inode *inode = d_inode(dentry);
 	int ret;
 	struct fscrypt_name fname;
-	struct qstr name;
 
 	ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname);
 	if (ret)
 		return ret;
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
 
 	/* This needs to handle no-key deletions later on */
 
@@ -4449,7 +4447,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
 			0);
 
 	ret = btrfs_unlink_inode(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)),
-				 &name);
+				 &fname.disk_name);
 	if (ret)
 		goto end_trans;
 
@@ -4476,7 +4474,6 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 	struct extent_buffer *leaf;
 	struct btrfs_dir_item *di;
 	struct btrfs_key key;
-	struct qstr name;
 	u64 index;
 	int ret;
 	u64 objectid;
@@ -4486,7 +4483,6 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 	ret = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname);
 	if (ret)
 		return ret;
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
 
 	/* This needs to handle no-key deletions later on */
 
@@ -4506,7 +4502,8 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 		goto out;
 	}
 
-	di = btrfs_lookup_dir_item(trans, root, path, dir_ino, &name, -1);
+	di = btrfs_lookup_dir_item(trans, root, path, dir_ino,
+				   &fname.disk_name, -1);
 	if (IS_ERR_OR_NULL(di)) {
 		ret = di ? PTR_ERR(di) : -ENOENT;
 		goto out;
@@ -4532,7 +4529,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 	 * call btrfs_del_root_ref, and it _shouldn't_ fail.
 	 */
 	if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) {
-		di = btrfs_search_dir_index_item(root, path, dir_ino, &name);
+		di = btrfs_search_dir_index_item(root, path, dir_ino, &fname.disk_name);
 		if (IS_ERR_OR_NULL(di)) {
 			if (!di)
 				ret = -ENOENT;
@@ -4549,7 +4546,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 	} else {
 		ret = btrfs_del_root_ref(trans, objectid,
 					 root->root_key.objectid, dir_ino,
-					 &index, &name);
+					 &index, &fname.disk_name);
 		if (ret) {
 			btrfs_abort_transaction(trans, ret);
 			goto out;
@@ -4562,7 +4559,7 @@ static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
 		goto out;
 	}
 
-	btrfs_i_size_write(BTRFS_I(dir), dir->i_size - name.len * 2);
+	btrfs_i_size_write(BTRFS_I(dir), dir->i_size - fname.disk_name.len * 2);
 	inode_inc_iversion(dir);
 	dir->i_mtime = current_time(dir);
 	dir->i_ctime = dir->i_mtime;
@@ -4585,7 +4582,7 @@ static noinline int may_destroy_subvol(struct btrfs_root *root)
 	struct btrfs_path *path;
 	struct btrfs_dir_item *di;
 	struct btrfs_key key;
-	struct qstr name = QSTR_INIT("default", 7);
+	struct fscrypt_str name = FSTR_INIT("default", 7);
 	u64 dir_id;
 	int ret;
 
@@ -4836,7 +4833,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 	struct btrfs_trans_handle *trans;
 	u64 last_unlink_trans;
 	struct fscrypt_name fname;
-	struct qstr name;
 
 	if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
 		return -ENOTEMPTY;
@@ -4852,7 +4848,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 	err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &fname);
 	if (err)
 		return err;
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
 
 	/* This needs to handle no-key deletions later on */
 
@@ -4875,7 +4870,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
 
 	/* now the directory is empty */
 	err = btrfs_unlink_inode(trans, BTRFS_I(dir), BTRFS_I(d_inode(dentry)),
-				 &name);
+				 &fname.disk_name);
 	if (!err) {
 		btrfs_i_size_write(BTRFS_I(inode), 0);
 		/*
@@ -5569,7 +5564,6 @@ no_delete:
 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
 			       struct btrfs_key *location, u8 *type)
 {
-	struct qstr name;
 	struct btrfs_dir_item *di;
 	struct btrfs_path *path;
 	struct btrfs_root *root = BTRFS_I(dir)->root;
@@ -5584,12 +5578,10 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
 	if (ret)
 		goto out;
 
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
-
 	/* This needs to handle no-key deletions later on */
 
 	di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(BTRFS_I(dir)),
-				   &name, 0);
+				   &fname.disk_name, 0);
 	if (IS_ERR_OR_NULL(di)) {
 		ret = di ? PTR_ERR(di) : -ENOENT;
 		goto out;
@@ -5601,7 +5593,7 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
 		ret = -EUCLEAN;
 		btrfs_warn(root->fs_info,
 "%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",
-			   __func__, name.name, btrfs_ino(BTRFS_I(dir)),
+			   __func__, fname.disk_name.name, btrfs_ino(BTRFS_I(dir)),
 			   location->objectid, location->type, location->offset);
 	}
 	if (!ret)
@@ -5631,14 +5623,11 @@ static int fixup_tree_root_location(struct btrfs_fs_info *fs_info,
 	int ret;
 	int err = 0;
 	struct fscrypt_name fname;
-	struct qstr name;
 
 	ret = fscrypt_setup_filename(dir, &dentry->d_name, 0, &fname);
 	if (ret)
 		return ret;
 
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
-
 	path = btrfs_alloc_path();
 	if (!path) {
 		err = -ENOMEM;
@@ -5660,11 +5649,11 @@ static int fixup_tree_root_location(struct btrfs_fs_info *fs_info,
 	leaf = path->nodes[0];
 	ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
 	if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(BTRFS_I(dir)) ||
-	    btrfs_root_ref_name_len(leaf, ref) != name.len)
+	    btrfs_root_ref_name_len(leaf, ref) != fname.disk_name.len)
 		goto out;
 
-	ret = memcmp_extent_buffer(leaf, name.name, (unsigned long)(ref + 1),
-				   name.len);
+	ret = memcmp_extent_buffer(leaf, fname.disk_name.name,
+				   (unsigned long)(ref + 1), fname.disk_name.len);
 	if (ret)
 		goto out;
 
@@ -6297,7 +6286,6 @@ int btrfs_new_inode_prepare(struct btrfs_new_inode_args *args,
 					     &args->fname);
 		if (ret)
 			return ret;
-		args->name = (struct qstr)FSTR_TO_QSTR(&args->fname.disk_name);
 	}
 
 	ret = posix_acl_create(dir, &inode->i_mode, &args->default_acl, &args->acl);
@@ -6380,7 +6368,7 @@ int btrfs_create_new_inode(struct btrfs_trans_handle *trans,
 {
 	struct inode *dir = args->dir;
 	struct inode *inode = args->inode;
-	const struct qstr *name = args->orphan ? NULL : &args->dentry->d_name;
+	const struct fscrypt_str *name = args->orphan ? NULL : &args->fname.disk_name;
 	struct btrfs_fs_info *fs_info = btrfs_sb(dir->i_sb);
 	struct btrfs_root *root;
 	struct btrfs_inode_item *inode_item;
@@ -6615,7 +6603,7 @@ out:
  */
 int btrfs_add_link(struct btrfs_trans_handle *trans,
 		   struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
-		   const struct qstr *name, int add_backref, u64 index)
+		   const struct fscrypt_str *name, int add_backref, u64 index)
 {
 	int ret = 0;
 	struct btrfs_key key;
@@ -6771,7 +6759,6 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	struct inode *inode = d_inode(old_dentry);
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	struct fscrypt_name fname;
-	struct qstr name;
 	u64 index;
 	int err;
 	int drop_inode = 0;
@@ -6787,8 +6774,6 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	if (err)
 		goto fail;
 
-	name = (struct qstr)FSTR_TO_QSTR(&fname.disk_name);
-
 	err = btrfs_set_inode_index(BTRFS_I(dir), &index);
 	if (err)
 		goto fail;
@@ -6815,7 +6800,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
 	set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags);
 
 	err = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode),
-			     &name, 1, index);
+			     &fname.disk_name, 1, index);
 
 	if (err) {
 		drop_inode = 1;
@@ -9080,7 +9065,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	int ret2;
 	bool need_abort = false;
 	struct fscrypt_name old_fname, new_fname;
-	struct qstr old_name, new_name;
+	struct fscrypt_str *old_name, *new_name;
 
 	/*
 	 * For non-subvolumes allow exchange only within one subvolume, in the
@@ -9102,8 +9087,8 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 		return ret;
 	}
 
-	old_name = (struct qstr)FSTR_TO_QSTR(&old_fname.disk_name);
-	new_name = (struct qstr)FSTR_TO_QSTR(&new_fname.disk_name);
+	old_name = &old_fname.disk_name;
+	new_name = &new_fname.disk_name;
 
 	/* close the race window with snapshot create/destroy ioctl */
 	if (old_ino == BTRFS_FIRST_FREE_OBJECTID ||
@@ -9172,7 +9157,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 		/* force full log commit if subvolume involved. */
 		btrfs_set_log_full_commit(trans);
 	} else {
-		ret = btrfs_insert_inode_ref(trans, dest, &new_name, old_ino,
+		ret = btrfs_insert_inode_ref(trans, dest, new_name, old_ino,
 					     btrfs_ino(BTRFS_I(new_dir)),
 					     old_idx);
 		if (ret)
@@ -9185,7 +9170,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 		/* force full log commit if subvolume involved. */
 		btrfs_set_log_full_commit(trans);
 	} else {
-		ret = btrfs_insert_inode_ref(trans, root, &old_name, new_ino,
+		ret = btrfs_insert_inode_ref(trans, root, old_name, new_ino,
 					     btrfs_ino(BTRFS_I(old_dir)),
 					     new_idx);
 		if (ret) {
@@ -9220,7 +9205,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	} else { /* src is an inode */
 		ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir),
 					   BTRFS_I(old_dentry->d_inode),
-					   &old_name, &old_rename_ctx);
+					   old_name, &old_rename_ctx);
 		if (!ret)
 			ret = btrfs_update_inode(trans, root, BTRFS_I(old_inode));
 	}
@@ -9235,7 +9220,7 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	} else { /* dest is an inode */
 		ret = __btrfs_unlink_inode(trans, BTRFS_I(new_dir),
 					   BTRFS_I(new_dentry->d_inode),
-					   &new_name, &new_rename_ctx);
+					   new_name, &new_rename_ctx);
 		if (!ret)
 			ret = btrfs_update_inode(trans, dest, BTRFS_I(new_inode));
 	}
@@ -9245,14 +9230,14 @@ static int btrfs_rename_exchange(struct inode *old_dir,
 	}
 
 	ret = btrfs_add_link(trans, BTRFS_I(new_dir), BTRFS_I(old_inode),
-			     &new_name, 0, old_idx);
+			     new_name, 0, old_idx);
 	if (ret) {
 		btrfs_abort_transaction(trans, ret);
 		goto out_fail;
 	}
 
 	ret = btrfs_add_link(trans, BTRFS_I(old_dir), BTRFS_I(new_inode),
-			     &old_name, 0, new_idx);
+			     old_name, 0, new_idx);
 	if (ret) {
 		btrfs_abort_transaction(trans, ret);
 		goto out_fail;
@@ -9337,7 +9322,6 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 	int ret2;
 	u64 old_ino = btrfs_ino(BTRFS_I(old_inode));
 	struct fscrypt_name old_fname, new_fname;
-	struct qstr old_name, new_name;
 
 	if (btrfs_ino(BTRFS_I(new_dir)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
 		return -EPERM;
@@ -9364,12 +9348,8 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 		return ret;
 	}
 
-	old_name = (struct qstr)FSTR_TO_QSTR(&old_fname.disk_name);
-	new_name = (struct qstr)FSTR_TO_QSTR(&new_fname.disk_name);
-
 	/* check for collisions, even if the  name isn't there */
-	ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, &new_name);
-
+	ret = btrfs_check_dir_item_collision(dest, new_dir->i_ino, &new_fname.disk_name);
 	if (ret) {
 		if (ret == -EEXIST) {
 			/* we shouldn't get
@@ -9462,8 +9442,9 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 		/* force full log commit if subvolume involved. */
 		btrfs_set_log_full_commit(trans);
 	} else {
-		ret = btrfs_insert_inode_ref(trans, dest, &new_name, old_ino,
-					     btrfs_ino(BTRFS_I(new_dir)), index);
+		ret = btrfs_insert_inode_ref(trans, dest, &new_fname.disk_name,
+					     old_ino, btrfs_ino(BTRFS_I(new_dir)),
+					     index);
 		if (ret)
 			goto out_fail;
 	}
@@ -9486,7 +9467,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 	} else {
 		ret = __btrfs_unlink_inode(trans, BTRFS_I(old_dir),
 					   BTRFS_I(d_inode(old_dentry)),
-					   &old_name, &rename_ctx);
+					   &old_fname.disk_name, &rename_ctx);
 		if (!ret)
 			ret = btrfs_update_inode(trans, root, BTRFS_I(old_inode));
 	}
@@ -9505,7 +9486,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 		} else {
 			ret = btrfs_unlink_inode(trans, BTRFS_I(new_dir),
 						 BTRFS_I(d_inode(new_dentry)),
-						 &new_name);
+						 &new_fname.disk_name);
 		}
 		if (!ret && new_inode->i_nlink == 0)
 			ret = btrfs_orphan_add(trans,
@@ -9517,7 +9498,7 @@ static int btrfs_rename(struct user_namespace *mnt_userns,
 	}
 
 	ret = btrfs_add_link(trans, BTRFS_I(new_dir), BTRFS_I(old_inode),
-			     &new_name, 0, index);
+			     &new_fname.disk_name, 0, index);
 	if (ret) {
 		btrfs_abort_transaction(trans, ret);
 		goto out_fail;