Safe data access following storage failure

A computer system, the system comprising:

• at least one processor configured to execute computer executable instructions;
• at least one computer readable storage media storing the computer executable instructions that, when executed by the at least one processor, provide a storage system configured to:
• receive a first access request for target data, the target data stored by a storage system, and the first access request including a request identifier;
• store the request identifier in persistent storage as a first stored identifier;
• grant the first access request for the target data;
• after a failure, receive a resume request for the target data, the resume request including the request identifier and including a resume request flag;
• determine whether the target data has changed since the failure by comparing the request identifier in the resume request to one or more identifiers in persistent storage;
• when the target data has not changed since the failure, grant the resume request for the target data;
• and
• when the target data has changed since the failure, deny the resume request.

A computer storage medium storing instructions that, when executed by at least one processor, cause the at least one processor to perform a method, the method comprising:

• receiving a first access request for target data, the target data stored by a storage system, and the first access request associated with a request identifier;
• storing the request identifier in persistent storage as a first stored identifier;
• granting the first access request for the target data;
• after a failure, receiving a resume request for the target data, the resume request associated with the request identifier;
• determining whether the target data has changed since the failure by comparing the request identifier in the resume request to one or more identifiers in persistent storage;
• when the target data has not changed since the failure, granting the resume request for the target data;
• and
• when the target data has changed since the failure, denying the resume request.