Layered computing systems and methods with location exclusions

• US 7,519,963 B1
• Filed: 12/21/2006
• Issued: 04/14/2009
• Est. Priority Date: 06/12/2002
• Status: Expired due to Fees

• Current Assignee: CA, Inc. (d/b/a CA Technologies) (Broadcom, Inc.)
• Original Assignee: Symantec Corporation (NortonLifeLock Inc.)
• Inventors: Cook, Randall Richards, Blaser, Jared Ricks
• Primary Examiner(s): Bullock, Jr.; Lewis A
• Assistant Examiner(s): LOUIE, JUE WANG
• Application Number:
  US11/614,826
• Time in Patent Office: 845 Days
• Field of Search: 707/203, 717168-170, 717174-176, 719/310, 726/4, 726/17, 726/21, 713164-167
• US Class Current: 717/174
• CPC Class Codes: G06F 8/61 Installation

Abstract

The inventions relate generally to computer systems having facilities for providing virtual portions of file systems and configuration settings to applications. More particularly, the inventions relate to computer systems that provide a layer organization for files and configuration settings that can be overlaid on top of an operating system. Detailed information on various example embodiments of the inventions are provided in the Detailed Description below, and the inventions are defined by the appended claims.

Claims

1. A layered computing system for isolating files from a base operating system, capable of storing a user file to a non-layered location, comprising:

a processor;

a storage device group accessible by said processor, said storage group operable to contain system files, at least one application, and a plurality of layers configured to be selectively activated as enabled layers or deactivated as disabled layers;

instructions stored to said storage device group, said instructions being further executable by said processor to achieve functions of;

receiving from said application a write request for a write operation to a file system, said write request containing a file reference appropriate to a file system organization;

determining whether at least one of the enabled layers is configured for capture;

determining whether said write request is related to said user file;

if said write request is either determined to relate to said user file or none of the enabled layers are configured for capture, causing said write operation to execute using said file reference of said write request;

if at least one of the enabled layers is configured for capture and said write request is determined not to relate to said user file, identifying one of the enabled layers as a capture layer;

following the identifying of said capture layer, creating a virtual write reference corresponding to said file reference of said write request relative to said capture layer;

following the creating of said virtual write reference, causing said write operation to execute using said virtual write reference.

2. A layered computing system according to claim 1, wherein in the execution of said instructions the determination of whether said file reference relates to said user file is made with respect to whether said file reference is within a preselected location.

3. A layered computing system according to claim 2, wherein in the execution of said instructions the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a removable drive.

4. A layered computing system according to claim 2, wherein in the execution of said instructions the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a preselected directory.

5. A layered computing system according to claim 1, wherein said instructions are further executable to achieve the functions of:

receiving from said application a read request for a read operation to said file system, said read request containing a file reference appropriate to said file system organization;

for said read request, determining whether said file reference is maintained in at least one of said enabled layers;

if said read request containing said file reference is found not to be maintained in at least one of said enabled layers, then causing a read operation to execute using said file reference of said read request;

if said read request containing said file reference is found to be maintained in at least one of said enabled layers, then identifying an owner layer having priority over said enabled layers;

following the identifying of said owner layer for said read request, identifying a virtual read reference in said owner layer;

following the identifying of said virtual read reference, causing said read operation to execute using said virtual read reference.

6. A layered computing system according to claim 1, wherein said instructions are further executable to achieve the function of copying an existing file from said base operating system to one of said plurality of layers prior to causing said write operation to execute if said write operation is a modify operation to said existing file.

7. A layered computing system according to claim 1, wherein said instructions are further executable to achieve the functions of:

receiving from said application a registry request to create, delete, or set a value of a registry setting;

following receipt of said registry request, determining whether a registry operation of said registry request is to be captured to one of said enabled layers;

if said registry request is a request to create said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting creation operation to execute in a registry location for said base operating system;

if said registry request is a request to create said registry setting, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry creation destination layer;

following said identifying of said registry creation destination layer, causing said registry setting to be created virtually in said registry creation destination layer;

if said registry request is a request to delete said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting deletion operation to execute in said registry location for said base operating system;

if said registry request is a request to delete said registry setting, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry deletion destination layer;

following said identifying of said registry deletion destination layer, causing said registry setting to be deleted virtually in said registry deletion destination layer;

if said registry request is a request to set said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting operation to execute in said registry location for said base operating system;

if said registry request is a request to set said registry setting, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry setting destination layer; and

following said identifying said registry setting destination layer, causing said registry setting to be created virtually in said registry setting destination layer.

8. A set of computer readable media containing computer instructions for operating a layered computing environment permissive of a user file being written to a non-layered location, the set of computer readable media comprising at least one medium upon which is stored the computer instructions executable by a computing system to achieve functions of:

receiving from an application a write request for a write operation to a file system, said write request containing a file reference appropriate to a file system organization;

determining whether at least one of the enabled layers is configured for capture;

determining whether said write request is related to said user file;

if said write request is either determined to relate to said user file or none of the enabled layers are configured for capture, causing said write operation to execute using said file reference of said write request;

if at least one of the enabled layers is configured for capture and said write request is determined not to relate to said user file, identifying one of the enabled layers as a capture layer;

following the identifying of said capture layer, creating a virtual write reference corresponding to said file reference of said write request relative to said capture layer;

following the creating of said virtual write reference, causing said write operation to execute using said virtual write reference.

9. A set of computer readable media according to claim 8, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is within a preselected location.

10. A set of computer readable media according to claim 9, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a removable drive.

11. A set of computer readable media according to claim 9, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a preselected directory.

12. A set of computer readable media according to claim 8, wherein said computer instructions are further executable to achieve the functions of:

receiving from said application a read request for a read operation to said file system, said read request containing a file reference appropriate to said file system organization;

for said read request, determining whether said file reference is maintained in at least one of said enabled layers;

if said read request containing said file reference is found not to be maintained in at least one of said enabled layers, then causing a read operation to execute using said file reference of said read request;

if said read request containing said file reference is found to be maintained in at least one of said enabled layers, then identifying an owner layer having priority over said enabled layers;

following the identifying of said owner layer for said read request, identifying a virtual read reference in said owner layer;

following the identifying of said virtual read reference, causing said read operation to execute using said virtual read reference.

13. A set of computer readable media according to claim 8, wherein said computer instructions are further executable to achieve the function of copying an existing file a base operating system to one of said enabled layers prior to causing said write operation to execute if said write operation is a modify operation to said existing file.

14. A set of computer readable media according to claim 8, wherein said computer instructions are further executable to achieve the functions of:

receiving from said application a registry request to create, delete, or set a value of a registry setting;

following receipt of said registry request, determining whether a registry operation of said registry request is to be captured to one of said enabled layers;

if said registry request is a request to create said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting creation operation to execute in a registry location for a base operating system;

if said registry request is a request to create said registry setting, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry creation destination layer;

following said identifying of said registry creation destination layer, causing said registry setting to be created virtually in said registry creation destination layer;

if said registry request is a request to delete said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting deletion operation to execute in said registry location for said base operating system;

if said registry request is a request to delete said registry, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry deletion destination layer;

following said identifying of said registry deletion destination layer, causing said registry setting to be deleted virtually in said registry deletion destination layer;

if said registry request is a request to set said registry setting, then upon a determination that said registry setting is not to be captured to one of said enabled layers, causing a registry setting operation to execute in said registry location for said base operating system;

if said registry request is a request to set said registry setting, then upon a determination that said registry setting is to be captured to one of said enabled layers, identifying a registry setting destination layer; and

following said identifying said registry setting destination layer, causing said registry setting to be created virtually in said registry setting destination layer.

15. A method of writing files in a layered computing environment permissive of a user file being written to a non-layered location, comprising the steps of:

receiving from an application a write request for a write operation to a file system, said write request containing a file reference appropriate to a file system organization;

determining whether said write request is related to said user file;

determining whether at least one of the enabled layers is configured for capture;

if said write request is either determined to relate to said user file or none of the enabled layers are configured for capture, causing said write operation to execute using said file reference of said write request;

if at least one of the enabled layers is configured for capture and said write request is determined not to relate to said user file, identifying one of the enabled layers as a capture layer;

following the identifying of said capture layer, creating a virtual write reference corresponding to said file reference of said write request relative to said capture layer;

following the creating of said virtual write reference, causing said write operation to execute using said virtual write reference.

16. A method according to claim 15, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is within a preselected location.

17. A method according to claim 15, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a removable drive.

18. A method according to claim 15, wherein the determination of whether said file reference relates to said user file is made with respect to whether said file reference is to a preselected directory.