Apparatus and method for fsync system call processing using ordered mode journaling with file unit

Patent metadata

Field	Value
Publication number	US-9798761-B2
Application number	US-201514805993-A
Country	US
Kind code	B2
Filing date	Jul 22, 2015
Priority date	Jul 24, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A computing device supporting ordered mode journaling. The computing device includes a memory that stores a program for operating a file system supporting ordered mode journaling; and a processor that operates the program stored in the memory. Wherein during execution of the program, when ordered mode journaling for a transaction including one or more files is implemented, the processor stores the transaction in a data area of the memory, and implements the journaling by storing a common journal including metadata of the transaction in a journal area of the memory.

First claim

We claim:

1. A computing device supporting ordered mode journaling, comprising:
a memory that stores a program for operating a file system supporting ordered mode journaling; and
a processor that operates the program stored in the memory,
wherein during execution of the program, when ordered mode journaling for a transaction including one or more files is implemented, the processor stores the transaction in a data area of the memory, and implements the ordered mode journaling by storing a common journal including metadata of the transaction in a journal area of the memory, and
when an fsync system call for any one file included in the transaction occurs, the processor stores the file, for which the fsync system call has occurred, in the data area of the memory, and implements the journaling by storing an fsync journal including metadata of the file, for which the fsync system call has occurred, in the journal area of the memory.

2. The computing device of claim 1 ,
wherein the processor stores the common journal and the fsync journal using an appending manner in the journal area of the memory.

3. The computing device of claim 1 ,
wherein the fsync journal comprises fsync journal header blocks,
the processor records inode information and name information of the file, for which the fsync system call has occurred, in the fsync journal header blocks.

4. The computing device of claim 1 ,
wherein the processor analyzes a type of a journal finally appended to the journal area in order to restore the file system,
if the type of the journal is the common journal, the processor restores the file system by using metadata of the common journal, and
if the type of the journal is the fsync journal, the processor restores the file system by using metadata of the fsync journal.

5. The computing device of claim 4 ,
wherein if the type of the journal is the fsync journal, the processor corrects the metadata recorded in the memory by using the metadata recorded in the fsync journal, after the restoration of the file system.

6. A method for ordered mode journaling of a file system, comprising:
implementing ordered mode journaling for a transaction including one or more files;
storing the transaction in a data area of a memory; and
implementing the ordered mode journaling by storing a common journal including metadata of the transaction in a journal area of the memory,
wherein when an fsync system call for any one file included in the transaction occurs, journaling with a unit of the file, for which the fsync system call has occurred, is implemented in response to the fsync system call.

7. The ordered mode journaling method of claim 6 ,
wherein the journaling with the unit of the file comprises:
recording the file, for which the fsync system call has occurred, in a data area of the memory; and
implementing the ordered mode journaling by storing an fsync journal including metadata of the file, for which the fsync system call has occurred, in a journal area of the memory.

8. The ordered mode journaling method of claim 7 ,
wherein the fsync journal comprises fsync journal header blocks,
the implementing of the journaling by storing the fsync journal records inode information and name information of the file, for which the fsync system call has occurred, in the fsync journal header blocks.

9. The ordered mode journaling method of claim 7 ,
wherein the step of implementing the journaling stores the common journal and the fsync journal using an appending manner in the journal area of the memory.

10. A method for restoring a file system based on ordered mode journaling, comprising:
identifying a type of a journal finally stored in a journal area of a memory;
restoring the file system by using metadata of a common journal if the type of the journal is the common journal; and
restoring the file system by using metadata of an fsync journal if the type of the journal is an fsync journal.

11. The method of claim 10 ,
wherein the step of restoring of the file system by using the metadata of the fsync journal comprises correcting the metadata recorded in the memory by using the metadata recorded in the fsync journal.

Assignees

• Univ Sungkyunkwan Res & Bus

Inventors

• Shin Dong Kun
• Park Dae Jun

Classifications

• G06F16/2365 Primary

  Ensuring data consistency and integrity · CPC title

• G06F16/1815

  Journaling file systems · CPC title

• G06F16/1865

  Transactional file systems · CPC title

• G06F16/178

  Techniques for file synchronisation in file systems · CPC title

• G06F16/2358

  Change logging, detection, and notification (replication G06F16/27) · CPC title