Computing device with relatively limited storage space and operating/file system thereof

• US 7,698,699 B2
• Filed: 12/01/2004
• Issued: 04/13/2010
• Est. Priority Date: 03/22/2004
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Gopalan, Yadhu N., Rogers, Andrew Michael
• Primary Examiner(s): Zhen; Wei Y
• Assistant Examiner(s): Wu; Junchun
• Application Number:
  US11/000,609
• Publication Number:
  US 20050210460A1
• Time in Patent Office: 1,959 Days
• Field of Search: 717168-173
• US Class Current: 717/168
• CPC Class Codes: G06F 8/65 Updates security arrangements therefor G06F21/57

Abstract

A method is provided for updating an application residing on a storage device of a computing device. The update is simulated by performing all necessary actions except for actually committing data relating to the update to the storage device, and it is determined whether the simulated update succeeded. If so, the update is performed by performing the same necessary actions and also actually committing the data relating to the update to the storage device.

Claims

1. A method for updating an application residing on a storage device of a computing device, the method comprising:

operating the computing device in a simulation mode wherein the computing device does not allow data to be committed to the storage device;

simulating the update on the computing device by operating the computing device in the simulation mode and performing all necessary actions except for actually committing file data and modified metadata relating to the update to the storage device, wherein the computing device includes a file system and the file system maintains metadata relating to files stored on the storage device and metadata relating to available storage space on the storage device, and modifying a file includes modifying data relating to the modified file, modifying metadata relating to the modified file, and modifying metadata relating to the storage device;

determining on the computing device whether the simulated update succeeded;

if the simulated update is deemed to be unsuccessful, discontinuing the updating of the application and operating the computing device in a regular mode wherein the computing device allows data to be committed to the storage device; and

if the simulated update is deemed to have succeeded, performing the update on the computing device by operating the computing device in the regular mode and performing the same necessary actions and also actually committing the modified file data and modified metadata relating to the update to the storage device.

2. The method of claim 1 comprising:

an installer simulating the update by operating the computing device in the simulation mode and performing all necessary actions;

the computing device in the simulation mode preventing the installer from actually committing data relating to the update to the storage device;

the installer determining whether the simulated update succeeded; and

the installer performing the update if the simulated update is deemed to have succeeded by operating the computing device in the regular mode and performing the same necessary actions;

the computing device in the regular mode allowing the installer to actually commit data relating to the update to the storage device.

3. The method of claim 1 wherein the metadata is stored in the storage device and also in a local memory and is periodically copied from the local memory to the storage device, the method further comprising:

saving a copy of the metadata in the local memory when the computing device is placed into the simulation mode and prior to performing the necessary actions;

simulating the update and modifying the metadata in the local memory as necessary; and

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode and prior to performing the necessary actions, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device.

4. The method of claim 1 wherein the metadata is stored in the storage device and also in a local memory and is periodically copied from the local memory to the storage device, the method further comprising:

placing the computing device into the simulation mode such that the computing device does not allow data to be committed to the storage device;

saving a copy of the metadata in the local memory when the computing device is placed into the simulation mode;

while in the simulation mode and for each file operation of the update;

performing the file operation except for actually committing data to the storage device and in so doing modifying the metadata in the local memory as necessary;

determining whether the file operation succeeded; and

if the operation did not succeed;

ending the update;

placing the computing device into the regular mode such that the computing device allows data to be committed to the storage device; and

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device; and

if each file operation of the update succeeded;

placing the computing device into the regular mode such that the computing device allows data to be committed to the storage device;

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device; and

performing each file operation of the update and actually committing data to the storage device and in so doing modifying the metadata in the local memory as necessary.

5. A computer-readable medium having stored thereon computer-executable instructions for performing a method for updating an application residing on a storage device of a computing device, the method comprising:

operating the computing device in a simulation mode wherein the computing device does not allow data to be committed to the storage device;

simulating the update on the computing device by operating the computing device in the simulation mode and performing all necessary actions except for actually committing file data and modified metadata relating to the update to the storage device, wherein the computing device includes a file system and the file system maintains metadata relating to files stored on the storage device and metadata relating to available storage space on the storage device, and modifying a file includes modifying data relating to the modified file, modifying metadata relating to the modified file, and modifying metadata relating to the storage device;

determining on the computing device whether the simulated update succeeded;

if the simulated update is deemed to be unsuccessful, discontinuing the updating of the application and operating the computing device in a regular mode wherein the computing device allows data to be committed to the storage device; and

if the simulated update is deemed to have succeeded, performing the update on the computing device by operating the computing device in the regular mode and performing the same necessary actions and also actually committing the modified file data and modified metadata relating to the update to the storage device.

6. The medium of claim 5 wherein the method comprises:

an installer simulating the update by operating the computing device in the simulation mode and performing all necessary actions;

the computing device in the simulation mode preventing the installer from actually committing data relating to the update to the storage device;

the installer determining whether the simulated update succeeded; and

the installer performing the update if the simulated update is deemed to have succeeded by operating the computing device in the regular mode and performing the same necessary actions;

the computing device in the regular mode allowing the installer to actually commit data relating to the update to the storage device.

7. The medium of claim 5 wherein the metadata is stored in the storage device and also in a local memory and is periodically copied from the local memory to the storage device, the method further comprising:

saving a copy of the metadata in the local memory when the computing device is placed into the simulation mode and prior to performing necessary actions;

simulating the update and modifying the metadata in the local memory as necessary; and

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode and prior to performing necessary actions, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device.

8. The medium of claim 5 wherein the metadata is stored in the storage device and also in a local memory and is periodically copied from the local memory to the storage device, the method further comprising:

placing the computing device into the simulation mode such that the computing device does not allow data to be committed to the storage device;

saving a copy of the metadata in the local memory when the computing device is placed into the simulation mode;

while in the simulation mode and for each file operation of the update;

performing the file operation except for actually committing data to the storage device and in so doing modifying the metadata in the local memory as necessary;

determining whether the file operation succeeded; and

if the operation did not succeed;

ending the update;

placing the computing device into the regular mode such that the computing device allows data to be committed to the storage device; and

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device; and

if each file operation of the update succeeded;

placing the computing device into the regular mode such that the computing device allows data to be committed to the storage device;

retrieving the saved copy of the metadata back into the local memory when the computing device is placed into the regular mode, whereby the saved and retrieved copy of the metadata reflects an actual state of the storage device; and

performing each file operation of the update and actually committing data to the storage device and in so doing modifying the metadata in the local memory as necessary.