Optimizing a file system interface in a virtualized computing environment

A computer program product for optimizing read operations to a storage device in a virtualized computing environment, the computer program product comprising:

• one or more non-transitory computer-readable storage media and program instructions stored on the one or more non-transitory computer-readable storage media, the program instructions comprising:
• program instructions to receive, by a virtual machine's (VM) operating system, a read system call from an application running on a virtual machine's (VM) operating system for data on a storage device, wherein the VM is hosted by a hypervisor providing access to the storage device in a virtualized computing environment;
• program instructions to cause a virtual file system (VFS) supported by the operating system to call on a first para-virtualized file system (PVFS FE) supported by the operating system to execute the read operation;
• and
• program instructions, in response to determining by the PVS FE that the data to be read exists in a data cache of the PVFS FE, to execute by the PVS FE the read operation from the cache of the PVFS FE.

A computer system for optimizing read operations to a storage device in a virtualized computing environment, the computer system comprising:

• one or more computer processors, one or more computer-readable storage media, and program instructions stored on one or more of the computer-readable storage media for execution by at least one of the one or more processors, the program instructions comprising:
• program instructions to receive, by a virtual machine's (VM) operating system, a read system call from an application running on a virtual machine's (VM) operating system for data on a storage device, wherein the VM is hosted by a hypervisor providing access to the storage device in a virtualized computing environment;
• program instructions to cause a virtual file system (VFS) supported by the operating system to call on a first para-virtualized file system (PVFS FE) supported by the operating system to execute the read operation;
• and
• program instructions, in response to determining by the PVS FE that the data to be read exists in a data cache of the PVFS FE, to execute by the PVS FE the read operation from the cache of the PVFS FE.