Exposing a proprietary disk file to a hypervisor as a native hypervisor disk file

1. One or more non-transitory computer-readable media storing one or more programs that are configured, when executed, to cause one or more processors to perform a method of exposing a proprietary disk file to a hypervisor as a native hypervisor disk file, the method comprising:

creating a plugin file corresponding to a proprietary disk file, the proprietary disk file having a proprietary file format;

intercepting, using a file system filter driver that sits between a hypervisor and a file system where the plugin file is stored, file read requests directed to the plugin file; and

responding, using the file system filter driver, to each of the file read requests with data gathered from the plugin file and/or the proprietary disk file, the data structured to cause the data to appear to be gathered from a native hypervisor disk file due to being formatted in a native file format of the hypervisor.

2. The one or more non-transitory computer-readable media as recited in claim 1 , wherein a portion of a name attribute of the plugin file falsely identifies the plugin file as having the native file format of the hypervisor.

3. The one or more non-transitory computer-readable media as recited in claim 2 , wherein the portion of the name attribute of the plugin file is a file extension of the name attribute of the plugin file.

4. The one or more non-transitory computer-readable media as recited in claim 1 , wherein the plugin file includes metadata that identifies the plugin file as having a plugin file format.

5. The one or more non-transitory computer-readable media as recited in claim 1 , wherein a data storage system external to the plugin file identifies the plugin file as having a plugin file format.

6. The one or more non-transitory computer-readable media as recited in claim 1 , wherein the plugin file is a sparse file with a size attribute set to an expected size of a corresponding file having the native file format of the hypervisor.

7. The one or more non-transitory computer-readable media as recited in claim 1 , wherein the method further comprises:

creating, using the hypervisor, a differencing disk file associated with the plugin file;

receiving, at the hypervisor, write requests; and

directing, using the hypervisor, the write requests to the differencing disk file.

8. One or more non-transitory computer-readable media storing one or more programs that are configured, when executed, to cause one or more processors to perform a method of exposing a proprietary disk file to a hypervisor as a native hypervisor disk file, the method comprising:

creating a plugin file corresponding to a proprietary disk file, the proprietary disk file having a proprietary file format;

intercepting, using a file system filter driver that sits between a hypervisor and a file system where the plugin file is stored, a file open request directed to the plugin file;

determining that the plugin file has a plugin file format;

responding, using the file system filter driver, to the file open request with a report that the plugin file was opened successfully;

intercepting, using the file system filter driver, file read requests directed to the plugin file; and

responding, using the file system filter driver, to each of the file read requests with data gathered from the plugin file and/or the proprietary disk file, the data being structured to cause the data to appear to be gathered from a native hypervisor disk file due to being formatted in a native file format of the hypervisor.

9. The one or more non-transitory computer-readable media as recited in claim 8 , wherein a file extension of a name attribute of the plugin file falsely identifies the plugin file as having the native file format of the hypervisor.

10. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the determining that the plugin file has the plugin file format includes determining that metadata that identifies the plugin file as having the plugin file format is present in the plugin file.

11. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the determining that the plugin file has the plugin file format includes determining that the plugin file is present in a list of files that have the plugin file format this is stored in a data storage system that is external to the plugin file.

12. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the plugin file is a sparse file with a size attribute set to an expected size of a corresponding file having the native file format of the hypervisor.

13. The one or more non-transitory computer-readable media as recited in claim 12 , wherein the method further comprises:

intercepting, using the file system filter driver, a file size attribute request directed to the plugin file; and

allowing the file size attribute request to pass through the file system filter driver unaltered and the corresponding response to pass through the file system filter driver unaltered.

14. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the method further comprises:

intercepting, using the file system filter driver, a file size attribute request directed to the plugin file;

determining an expected size of a file corresponding to the plugin file having the native file format of the hypervisor; and

responding, using the file system filter driver, to the file size attribute request with the expected size.

15. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the method further comprises:

intercepting, using the file system filter driver, a file write request directed to a particular location in the plugin file;

executing the file write request by storing data from the file write request in a location in the plugin file or in a location external to the plugin file;

responding, using the file system filter driver, to the file write request with a report that the file write request was executed successfully;

intercepting, using the file system filter driver, a subsequent file read request directed to the particular location in the plugin file; and

responding, using the file system filter driver, to the subsequent file read request with second data gathered from the location where the data from the file write request was previously stored, the second data being structured to cause the second data to appear to be gathered from a native hypervisor disk file due to being formatted in the native file format of the hypervisor.

16. The one or more non-transitory computer-readable media as recited in claim 8 , wherein the method further comprises:

intercepting, using the hypervisor, file write requests directed to the plugin file;

executing each of the file write requests by storing data from the file write request in the native file format of the hypervisor and in a location external to the plugin file; and

responding, using the hypervisor, to each of the file write requests with a report that the file write request was executed successfully.