Wireless access device and wireless access system

• US 9,762,671 B2
• Filed: 06/15/2015
• Issued: 09/12/2017
• Est. Priority Date: 02/20/2013
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Maeda, Takuji, Toyama, Masayuki
• Primary Examiner(s): Ibrahim, Mohamed
• Application Number:
  US14/739,029
• Publication Number:
  US 20150281361A1
• Time in Patent Office: 820 Days
• Field of Search: None
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: H04B 7/24 for communication between two or more posts wireless communication networks H04W
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

A file copy controller in a wireless access device reads file system management information of both of a local memory and a remote memory, generates a FS transfer list in which logical address positions of copy sources and logical address positions of copy destinations are stored, and inputs the FS transfer list to a non-volatile memory controller connected to the local memory. The non-volatile memory controller performs copy operation between the local memory and the remote memory based on the information stored in the FS transfer list without using a CPU in an access device or an internal bus connected to the CPU.

Claims

1. An access system comprising:

a first access device having a first memory; and

a second access device having a second memory, the first access device being communicated with the second access device,

wherein

the first access device includes;

a file system controller that obtains first file system management information from the first memory and second file management information from the second memory, and generates a transfer list as a list used for copying a file to the first memory or the second memory, the first file system management information being used for managing a file system in the first memory and the second file system management information being for managing a file system in the second memory; and

a first memory controller that controls copying the file to the first memory and the second memory, and wherein

in copying the file by the first memory controller,

the file system controller generates the transfer list, transmits the transfer list to the first memory controller, and

the first memory controller controls copying the file in the first memory or the second memory, using the transfer list, and

wherein

the file system controller

calculates a length of one continuous region included in a data storage region of the transfer source file and a length of one continuous empty region in which data of the transfer destination file is stored based on the first file system management information and the second file system management information, compares the length of the continuous region and the length of the continuous empty region, and generates the transfer list using a smaller length between the length of the continuous region and the length of the continuous empty region as a copy operation unit.

2. The access system according to claim 1,

wherein the first access device is communicated with the second access device wirelessly.

3. The access system according to claim 2,

wherein, when copying, the first memory controller generates an access command for accessing the first memory and accesses the first memory, and generates another access command for accessing the second memory, further converts the another access command into a wireless packet, wirelessly transmits the wireless packet to the second access device, and accesses the second memory.

4. The access system according to claim 3,

wherein, after wirelessly transmitting the other access command to the second access device, the first memory controller wirelessly receives a result, obtained by performing the another access command, in a wireless communication packet from the second access device.

5. The access system according to claim 1,

wherein

the second access device includes a second memory controller that controls the second memory and a communication between the first access device and the second access device, and

in copying the file to the second memory,

the first memory controller instructs the second memory controller to copy the file based on the transfer list, and the second memory controller controls copying the file in the second memory.

6. The access system according to claim 1,

wherein the file system controller identifies an address of a transfer source and an address of a transfer destination based on the first file system management information and the second file system management information, and generates a transfer list which includes at least the address of the transfer source, the address of the transfer destination and a transfer data size.

7. The access device according to claim 1, wherein, for a data storage region of a transfer source file and a data storage region of a transfer destination file, the file system controller

calculates a length of one continuous region included in the data storage region of the transfer source file and one or more continuous empty regions, a total length of the continuous empty regions being the same as the length of the continuous region, based on the first file system management information and the second file system management information, and generates the transfer list using one length among lengths of the continuous empty regions as a copy operation unit.

8. The access device according to claim 1,

wherein, for a data storage region of a transfer source file and a data storage region of a transfer destination file, the file system controller calculates a length of one continuous empty region as a region in which data of the transfer destination file is stored and one or more continuous regions, a total length of the continuous regions being the same as the length of the continuous empty region, based on the first file system management information and the second file system management information, and generates the transfer list using one length among lengths of the continuous regions as a copy operation unit.

9. An access device communicated with another access device having a second memory, the access device comprising:

a first memory;

a file system controller that obtains first file system management information from the first memory and second file management information from the second memory, and generates a transfer list as a list used for copying a file to the first memory or the second memory, the first file system management information being for managing a file system in the first memory and second file system management information being for managing a file system in the second memory; and

a first memory controller that controls copying the file in the first memory and the second memory, wherein

in copying the file to the first memory or the second memory,

the file system controller transmits the transfer list to the first memory controller, and

the first memory controller controls copying the file in the first memory or the second memory, using the transfer list, and

wherein

the file system controller

calculates a length of one continuous region included in a data storage region of the transfer source file and a length of one continuous empty region in which data of the transfer destination file is stored based on the first file system management information and the second file system management information, compares the length of the continuous region and the length of the continuous empty region, and generates the transfer list using a smaller length between the length of the continuous region and the length of the continuous empty region as a copy operation unit.

10. An information storage device connected to an access device communicated with another access device, the information storage device comprising:

a first memory; and

a first memory controller that controls copying of a file in the first memory and a second memory included in the other access device,

wherein the first memory controller receives a transfer list from the other access device as a list used for copying the file to the first memory or the second memory,

the transfer list being generated by the other access device based on first file system management information obtained from the first memory and second file management information obtained from the second memory, the first file system management information being for managing a file system in the first memory and the second file system management information being for managing a file system in the second memory, and

the first memory controller controls copying the file in the first memory or the second memory, using the transfer list, and wherein

the transfer list is generated based on a calculated length of one continuous region included in a data storage region of the transfer source file and a length of one continuous empty region in which data of the transfer destination file is stored using the first file system management information and the second file system management information, and based on the compared length of the continuous region and the length of the continuous empty region, the transfer list being generated using a smaller length between the length of the continuous region and the length of the continuous empty region as a copy operation unit.