PERFORMING ZERO-COPY SENDS IN A NETWORKED FILE SYSTEM WITH CRYPTOGRAPHIC SIGNING

摘要

A method and system for sending data in a file system that uses cryptographic signatures to protect data integrity. A computer system calculates a signature based on the content of a page of a memory. The memory is shared by processes that run on the computer system. The computer system write-protects the page while the page is used for calculation of the signature. When a first process attempts to modify the page, a page fault is triggered. In response to the page fault, the content of the page in memory is copied to a new page in the memory. The new page is accessible by the processes. Access to the page by the first process is redirected to the new page. Subsequent to the page fault, access to the page by the second process is also redirected to the new page.