Method and system for hybrid direct input/output (i/o) with a storage device

A non-transitory computer readable medium comprising instructions, which when executed by a processor perform a method, the method comprising:

• intercepting, in a user-level of a host, an open file request (OFR) for a file issued by an application to a file system (FS);
• forwarding the OFR to the FS, wherein the FS is located in the user-level and the OFR is forwarded to the FS via a kernel module in a kernel-level of the host;
• receiving from the FS, in response to the OFR, a file descriptor (FD) for the file;
• issuing a status request (SR) for the file to the FS, wherein the SR comprises the file descriptor;
• receiving from the FS, in response to the SR, status information for a target device on which the file is located, wherein the status information comprises an object identified (OID) for the file, wherein the target device is external to the host;
• storing a mapping of FD to the OID;
• after storing the mapping of the FD to the OID:
• intercepting, by a direct I/O library, a first file operation request (FOR) for the file, wherein the request comprises the FD;
• making a first determination that the first FOR is one selected from a group consisting of a read request and a write request;
• based on the first determination, making a second determination that the target device on which the file is located supports the direct I/O protocol;
• issuing a direct I/O request to the target device using the OID for the file, wherein the direct I/O request is not processed by the FS;
• intercepting, by the direct I/O library, a second FOR for the file, wherein the second FOR comprises the FD;
• making a third determination that the second FOR is not one selected from a group consisting of the read request and the write request;
• and
• based on the third determination, forwarding the second FOR to the FS via the kernel module in the kernel-level of the host.