Method and system for attribute encapsulated data resolution and transcoding

• US 8,285,692 B2
• Filed: 01/15/2010
• Issued: 10/09/2012
• Est. Priority Date: 01/15/2010
• Status: Active Grant

• Current Assignee: Oracle America, Inc. (Oracle Corporation)
• Original Assignee: Oracle America, Inc. (Oracle Corporation)
• Inventors: Johnson, Darrin P., Moore, William H., Saxe, Eric C.
• Primary Examiner(s): Trujillo, James
• Assistant Examiner(s): VU, THONG H
• Application Number:
  US12/688,458
• Publication Number:
  US 20110178997A1
• Time in Patent Office: 998 Days
• Field of Search: 707/102, 707/792, 707/608, 707/10, 707/999, 707/200, 707/1, 707/770, 707/100
• US Class Current: 707/694
• CPC Class Codes: G06F 16/13 File access structures, e.g. distributed indices arrangements of input from, or output to, record carriers G06F3/06

Abstract

A computer readable medium having software instructions that, when executed, perform a method for preserving data stored in a file system with a plurality of files. The method involves determining whether storage capacity of the file system has reached a threshold level, wherein the threshold level is stored in at least one of a plurality of size-reducing policies, obtaining a criterion from the at least one size-reducing policy, identifying a subset of the plurality of files that match the criterion, accessing metadata of each of the identified subset of files, wherein the metadata of each of the identified subset of files comprises at least one option for reducing a size of the file, and performing a size-reducing action to reduce a size of each of the identified subset of files based on the option for reducing the size of each of the identified subset of files and the criterion.

Claims

1. A non-transitory computer readable medium comprising software instructions that, when executed, perform a method for preserving data stored in a file system comprising a plurality of files, comprising:

determining whether storage capacity of the file system has reached a threshold level, wherein the threshold level is stored in at least one of a plurality of size-reducing policies;

obtaining at least one criterion from the at least one size-reducing policy;

identifying a first file and a second file of the plurality of files that match the at least one criterion;

accessing metadata of each of the first file and the second file, wherein the metadata of the first file is stored as a file system attribute, and the metadata of the second file is stored as an extended attribute, and wherein the metadata of the first and second files comprises at least one option for reducing a size of the first file and a size of the second file, respectively;

performing a first size-reducing action to reduce the size of the first file by calling a kernel-level service to perform the size-reducing action on the first file; and

performing a second size-reducing action to reduce the size of the second file, wherein the second size-reducing action is performed by an external user-land service configured to access the extended file attribute on behalf of the file system.

2. The non-transitory computer readable medium of claim 1, further comprising:

monitoring file system events; and

performing the first and second size-reducing actions before the storage capacity has reached the threshold level based on the monitored file system events.

3. The non-transitory computer readable medium of claim 1, wherein the plurality of files comprise multimedia data.

4. The non-transitory computer readable medium of claim 1, wherein the at least one option for reducing the size of the first file and the second file comprises at least one of downsampling and transcoding.

5. The non-transitory computer readable medium of claim 4, wherein the file system comprises an interface that provides access to at least one size-reducing library comprising one selected from a group consisting of downsampling functions and transcoding functions.

6. The non-transitory computer readable medium of claim 4, wherein downsampling of the first and second files further comprises:

eliminating at least one portion of data of the first and second files; and

providing a pointer referencing a remote copy of the eliminated data.

7. The non-transitory computer readable medium of claim 6, wherein the remote copy of the eliminated data comprises a first snapshot of the data at a first resolution, and a second snapshot of the data at a second resolution.

8. The non-transitory computer readable medium of claim 1, wherein the at least one criterion comprises at least one selected from a group consisting of size of the data, age of the data, time of creation, type of file, and available file system storage capacity.

9. The non-transitory computer readable medium of claim 1, wherein the plurality of size-reducing policies and the at least one criterion are one of user-defined or system-defined based on an original file type.

10. A system, comprising:

a file system comprising a plurality of files;

a storage pool configured to store the plurality of files;

a first service configured to;

determine whether storage capacity of the file system has reached a threshold level, wherein the threshold level is stored in at least one of a plurality of size-reducing policies;

obtain at least one criterion from the at least one size-reducing policy;

identify a first file and a second file of the plurality of files that match the at least one criterion;

access metadata of the first file, wherein the metadata of the first file is stored as a file system attribute and comprises at least one option for reducing a size of the first file; and

perform a first size-reducing action to reduce the size of the first file by wherein the first service is a kernel-level service configured to perform the size-reducing action on the first file; and

a second service configured to;

access metadata of the second file, wherein the metadata of the second file is stored as an extended file attribute and comprises at least one option for reducing a size of the second file; and

perform a second size-reducing action to reduce the size of the second file, wherein the second service is an external user-land service configured to access the extended file attribute on behalf of the file system and perform the second size-reducing action.

11. The system of claim 10, wherein the external user-land service has direct access to size-reducing libraries and the plurality of size-reducing policies.

12. The system of claim 10, wherein the at least one option for reducing the size of the first file and the second file comprises at least one of downsampling and transcoding.

13. The system of claim 12, wherein downsampling of the first and second files further comprises:

eliminating at least one portion of data of the identified subset of files; and

providing a pointer referencing a remote copy of the eliminated data.