@@ -1493,9 +1493,9 @@ int btrfs_insert_delayed_dir_index(struct btrfs_trans_handle *trans,
ret = __btrfs_add_delayed_item(delayed_node, delayed_item);
if (unlikely(ret)) {
+ // TODO: It would be nice to print the base64encoded name here maybe?
btrfs_err(trans->fs_info,
- "err add delayed dir index item(name: %.*s) into the insertion tree of the delayed node(root id: %llu, inode id: %llu, errno: %d)",
- fname_len(fname), fname_name(fname),
+ "err add delayed dir index item into the insertion tree of the delayed node (root id: %llu, inode id: %llu, errno: %d)",
delayed_node->root->root_key.objectid,
delayed_node->inode_id, ret);
BUG();
@@ -1728,7 +1728,9 @@ int btrfs_should_delete_dir_index(struct list_head *del_list,
* btrfs_readdir_delayed_dir_index - read dir info stored in the delayed tree
*
*/
-int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
+int btrfs_readdir_delayed_dir_index(struct inode *inode,
+ struct fscrypt_str *fstr,
+ struct dir_context *ctx,
struct list_head *ins_list)
{
struct btrfs_dir_item *di;
@@ -1738,6 +1740,7 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
int name_len;
int over = 0;
unsigned char d_type;
+ size_t fstr_len = fstr->len;
if (list_empty(ins_list))
return 0;
@@ -1765,8 +1768,27 @@ int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
d_type = fs_ftype_to_dtype(btrfs_dir_flags_to_ftype(di->type));
btrfs_disk_key_to_cpu(&location, &di->location);
- over = !dir_emit(ctx, name, name_len,
- location.objectid, d_type);
+ if (di->type & BTRFS_FT_FSCRYPT_NAME) {
+ int ret;
+ struct fscrypt_str iname = FSTR_INIT(name, name_len);
+ fstr->len = fstr_len;
+ /*
+ * The hash is only used when the encryption key is not
+ * available. But if we have delayed insertions, then we
+ * must have the encryption key available or we wouldn't
+ * have been able to create entries in the directory.
+ * So, we don't calculate the hash.
+ */
+ ret = fscrypt_fname_disk_to_usr(inode, 0, 0, &iname,
+ fstr);
+ if (ret)
+ return ret;
+ over = !dir_emit(ctx, fstr->name, fstr->len,
+ location.objectid, d_type);
+ } else {
+ over = !dir_emit(ctx, name, name_len, location.objectid,
+ d_type);
+ }
if (refcount_dec_and_test(&curr->refs))
kfree(curr);
@@ -142,7 +142,9 @@ void btrfs_readdir_put_delayed_items(struct inode *inode,
struct list_head *del_list);
int btrfs_should_delete_dir_index(struct list_head *del_list,
u64 index);
-int btrfs_readdir_delayed_dir_index(struct dir_context *ctx,
+int btrfs_readdir_delayed_dir_index(struct inode *inode,
+ struct fscrypt_str *fstr,
+ struct dir_context *ctx,
struct list_head *ins_list);
/* for init */
@@ -120,6 +120,9 @@ int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
struct btrfs_disk_key disk_key;
u32 data_size;
+ if (fname->crypto_buf.name)
+ type |= BTRFS_FT_FSCRYPT_NAME;
+
key.objectid = btrfs_ino(dir);
key.type = BTRFS_DIR_ITEM_KEY;
key.offset = btrfs_name_hash(fname);
@@ -385,6 +388,18 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
u32 cur = 0;
u32 this_len;
struct extent_buffer *leaf;
+ bool encrypted = (fname->crypto_buf.name != NULL);
+ struct fscrypt_name unencrypted_fname;
+
+ if (encrypted) {
+ unencrypted_fname = (struct fscrypt_name){
+ .usr_fname = fname->usr_fname,
+ .disk_name = {
+ .name = (unsigned char *)fname->usr_fname->name,
+ .len = fname->usr_fname->len,
+ },
+ };
+ }
leaf = path->nodes[0];
dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
@@ -402,6 +417,14 @@ struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_fs_info *fs_info,
return dir_item;
}
+ if (encrypted &&
+ btrfs_dir_name_len(leaf, dir_item) == fname_len(&unencrypted_fname) &&
+ btrfs_fscrypt_match_name(&unencrypted_fname, leaf,
+ (unsigned long)(dir_item + 1),
+ dir_name_len)) {
+ return dir_item;
+ }
+
cur += this_len;
dir_item = (struct btrfs_dir_item *)((char *)dir_item +
this_len);
@@ -5883,12 +5883,25 @@ struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry)
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_root *sub_root = root;
struct btrfs_key location;
+ struct fscrypt_name fname;
u8 di_type = 0;
int ret = 0;
if (dentry->d_name.len > BTRFS_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
+ if (BTRFS_I(dir)->flags & BTRFS_INODE_FSCRYPT_CONTEXT) {
+ ret = fscrypt_prepare_lookup(dir, dentry, &fname);
+ if (ret)
+ return ERR_PTR(ret);
+ } else {
+ fname = (struct fscrypt_name) {
+ .usr_fname = &dentry->d_name,
+ .disk_name = FSTR_INIT((char *) dentry->d_name.name,
+ dentry->d_name.len),
+ };
+ }
+
ret = btrfs_inode_by_name(dir, dentry, &location, &di_type);
if (ret < 0)
return ERR_PTR(ret);
@@ -6030,18 +6043,32 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
struct list_head del_list;
int ret;
char *name_ptr;
- int name_len;
+ u32 name_len;
int entries = 0;
int total_len = 0;
bool put = false;
struct btrfs_key location;
+ struct fscrypt_str fstr = FSTR_INIT(NULL, 0);
+ u32 fstr_len = 0;
if (!dir_emit_dots(file, ctx))
return 0;
+ if (BTRFS_I(inode)->flags & BTRFS_INODE_FSCRYPT_CONTEXT) {
+ ret = fscrypt_prepare_readdir(inode);
+ if (ret)
+ return ret;
+ ret = fscrypt_fname_alloc_buffer(BTRFS_NAME_LEN, &fstr);
+ if (ret)
+ return ret;
+ fstr_len = fstr.len;
+ }
+
path = btrfs_alloc_path();
- if (!path)
- return -ENOMEM;
+ if (!path) {
+ ret = -ENOMEM;
+ goto err_fstr;
+ }
addr = private->filldir_buf;
path->reada = READA_FORWARD;
@@ -6059,6 +6086,7 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
struct dir_entry *entry;
struct extent_buffer *leaf = path->nodes[0];
u8 di_flags;
+ u32 nokey_len;
if (found_key.objectid != key.objectid)
break;
@@ -6070,8 +6098,13 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
continue;
di = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
name_len = btrfs_dir_name_len(leaf, di);
- if ((total_len + sizeof(struct dir_entry) + name_len) >=
- PAGE_SIZE) {
+ nokey_len = DIV_ROUND_UP(name_len * 4, 3);
+ /*
+ * If name is encrypted, and we don't have the key, we could
+ * need up to 4/3rds the bytes to print it.
+ */
+ if ((total_len + sizeof(struct dir_entry) + nokey_len)
+ >= PAGE_SIZE) {
btrfs_release_path(path);
ret = btrfs_filldir(private->filldir_buf, entries, ctx);
if (ret)
@@ -6085,8 +6118,36 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
di_flags = btrfs_dir_flags(leaf, di);
entry = addr;
name_ptr = (char *)(entry + 1);
- read_extent_buffer(leaf, name_ptr,
- (unsigned long)(di + 1), name_len);
+ if (di_flags & BTRFS_FT_FSCRYPT_NAME) {
+ struct fscrypt_str oname = FSTR_INIT(name_ptr,
+ nokey_len);
+ u32 hash = 0, minor_hash = 0;
+
+ read_extent_buffer(leaf, fstr.name,
+ (unsigned long)(di + 1), name_len);
+ fstr.len = name_len;
+ /*
+ * We're iterating through DIR_INDEX items, so we don't
+ * have the DIR_ITEM hash handy. Only compute it if
+ * we'll need it.
+ */
+ if (!fscrypt_has_encryption_key(inode)) {
+ struct fscrypt_name fname = {
+ .disk_name = oname,
+ };
+ u64 name_hash = btrfs_name_hash(&fname);
+ hash = name_hash;
+ minor_hash = name_hash >> 32;
+ }
+ ret = fscrypt_fname_disk_to_usr(inode, hash, minor_hash,
+ &fstr, &oname);
+ if (ret)
+ goto err;
+ name_len = oname.len;
+ } else {
+ read_extent_buffer(leaf, name_ptr,
+ (unsigned long)(di + 1), name_len);
+ }
put_unaligned(name_len, &entry->name_len);
put_unaligned(
fs_ftype_to_dtype(btrfs_dir_flags_to_ftype(di_flags)),
@@ -6108,7 +6169,8 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
if (ret)
goto nopos;
- ret = btrfs_readdir_delayed_dir_index(ctx, &ins_list);
+ fstr.len = fstr_len;
+ ret = btrfs_readdir_delayed_dir_index(inode, &fstr, ctx, &ins_list);
if (ret)
goto nopos;
@@ -6139,6 +6201,8 @@ static int btrfs_real_readdir(struct file *file, struct dir_context *ctx)
if (put)
btrfs_readdir_put_delayed_items(inode, &ins_list, &del_list);
btrfs_free_path(path);
+err_fstr:
+ fscrypt_fname_free_buffer(&fstr);
return ret;
}