Systems and methods for restoring images
A computer-implemented method for restoring images may include (1) identifying an image to restore to a volume, (2) creating a synchronization map that reflects differences between the image and the volume, (3) intercepting at least one attempt to read from a region of the volume, (4) determining, based on the synchronization map, that the region has not yet been restored from the image, (5) copying the region from the image to the volume, (6) updating the synchronization map to reflect that the region has been restored, and (7) allowing the attempt to read from the region to proceed. Various other methods, systems, and computer-readable media are also disclosed.
1. A computer-implemented method for restoring images, the method being performed by a computing device comprising at least one processor, the method comprising:
identifying an image to restore to a volume;
creating a synchronization map that reflects differences between the image and the volume;
intercepting at least one attempt to read from a region of the volume;
determining, when the synchronization map indicates that the attempt to read applies to a region that has not yet been restored, that the region of the volume has not yet been restored from the image;
in response to both the attempt to read from the region of the volume and the determination that the region of the volume has not yet been restored from the image:
restoring the region of the volume from the image to the volume;
updating the synchronization map to reflect that the region of the volume has been restored;
upon restoring the region of the volume from the image to the volume, allowing the attempt to read from the region of the volume to proceed.
2. The computer-implemented method of claim 1 , further comprising:
identifying at least one additional attempt to read from an additional region of the volume;
determining, based on the synchronization map, that the additional region of the volume has been restored from the image;
allowing the additional attempt to read from the additional region of the volume to proceed.
3. The computer-implemented method of claim 1 , wherein intercepting the attempt to read from the region of the volume comprises intercepting the attempt from within a filter driver.
4. The computer-implemented method of claim 1 , wherein updating the synchronization map comprises updating the synchronization map on a non-volatile storage device.
5. The computer-implemented method of claim 1 , wherein the synchronization map comprises a bitmap indicating which regions within the image have yet to be restored to the volume.
6. The computer-implemented method of claim 1 , wherein the image comprises at least one of:
a backup image;
a virtual image.
7. The computer-implemented method of claim 1 , wherein identifying the image comprises mounting the image.
8. The computer-implemented method of claim 1 , wherein identifying the image comprises identifying a remotely-stored image.
9. A system for restoring images, the system comprising:
an identification module programmed to identify an image to restore to a volume;
a creation module programmed to create a synchronization map that reflects differences between the image and the volume;
an interception module programmed to intercept at least one attempt to read from a region of the volume;
a determination module programmed to determine, when the synchronization map indicates that the attempt to read applies to a region that has not yet been restored, that the region of the volume has not yet been restored from the image;
a copying module programmed to restore the region of the volume from the image to the volume in response to both the attempt to read from the region of the volume and the determination that the region of the volume has not yet been restored from the image;
an updating module programmed update the synchronization map when the region of the volume has been restored;
a reading module programmed to allow the attempt to read from the region of the volume to proceed following the restoration of the region of the volume from the image to the volume;
at least one processor configured to execute the identification module, the creation module, the interception module, the determination module, the copying module, the updating module, and the reading module.
10. The system of claim 9 , wherein:
the interception module is further programmed to identify at least one additional attempt to read from an additional region of the volume;
the determination module is further programmed to determine, based on the synchronization map, that the additional region of the volume has been restored from the image;
the reading module is further programmed to allow the additional attempt to read from the additional region of the volume to proceed.
11. The system of claim 9 , wherein the interception module is programmed to intercept the attempt to read from the region of the volume by intercepting the attempt from within a filter driver.
12. The system of claim 9 , wherein the updating module is programmed to update the synchronization map by updating the synchronization map on a non-volatile storage device.
13. The system of claim 9 , wherein the synchronization map comprises a bitmap indicating which regions within the image have yet to be restored to the volume.
14. The system of claim 9 , wherein the image comprises at least one of:
a backup image;
a virtual image.
15. The system of claim 9 , wherein the identification module is programmed to identify the image by mounting the image.
16. The system of claim 9 , wherein the identification module is programmed to identify the image by identifying a remotely-stored image.
17. A non-transitory computer-readable-storage medium comprising one or more computer-executable instructions that, when executed by at least one processor of a computing device, cause the computing device to:
identify an image to restore to a volume;
create a synchronization map that reflects differences between the image and the volume;
intercept at least one attempt to read from a region of the volume;
determine, when the synchronization map indicates that the attempt to read applies to a region that has not yet been restored, that the region of the volume has not yet been restored from the image;
in response to both the attempt to read from the region of the volume and the determination that the region of the volume has not yet been restored from the image:
restore the region of the volume from the image to the volume;
update the synchronization map to reflect that the region of the volume has been restored;
upon the restoration of the region of the volume from the image to the volume, allow the attempt to read from the region of the volume to proceed.
18. The non-transitory computer-readable-storage medium of claim 17 , wherein the one or more computer-executable instructions further cause the computing device to:
identify at least one additional attempt to read from an additional region of the volume;
determine, based on the synchronization map, that the additional region of the volume has been restored from the image;
allow the additional attempt to read from the additional region of the volume to proceed.
19. The non-transitory computer-readable-storage medium of claim 17 , wherein intercepting the attempt to read from the region of the volume comprises intercepting the attempt from within a filter driver.
20. The non-transitory computer-readable-storage medium of claim 17 , wherein updating the synchronization map comprises updating the synchronization map on a non-volatile storage device.