CA2305985A1 - Portable electronic device having a log-structured file system in flash memory - Google Patents

Portable electronic device having a log-structured file system in flash memory Download PDF

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Publication number
CA2305985A1
CA2305985A1 CA002305985A CA2305985A CA2305985A1 CA 2305985 A1 CA2305985 A1 CA 2305985A1 CA 002305985 A CA002305985 A CA 002305985A CA 2305985 A CA2305985 A CA 2305985A CA 2305985 A1 CA2305985 A1 CA 2305985A1
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Canada
Prior art keywords
log
file system
structured file
flash memory
electronic device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002305985A
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French (fr)
Other versions
CA2305985C (en
Inventor
Kenneth W. Parker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BlackBerry Ltd
Original Assignee
Research in Motion Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Research in Motion Ltd filed Critical Research in Motion Ltd
Priority to CA002429250A priority Critical patent/CA2429250C/en
Publication of CA2305985A1 publication Critical patent/CA2305985A1/en
Application granted granted Critical
Publication of CA2305985C publication Critical patent/CA2305985C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
    • G06F3/0614—Improving the reliability of storage systems
    • G06F3/0616—Improving the reliability of storage systems in relation to life time, e.g. increasing Mean Time Between Failures [MTBF]
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
    • G06F3/0638—Organizing or formatting or addressing of data
    • G06F3/0643—Management of files
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
    • G06F3/0601—Interfaces specially adapted for storage systems
    • G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
    • G06F3/0671—In-line storage system
    • G06F3/0673—Single storage device
    • G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
    • G11C7/16—Storage of analogue signals in digital stores using an arrangement comprising analogue/digital [A/D] converters, digital memories and digital/analogue [D/A] converters 
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99951—File or database maintenance
    • Y10S707/99952—Coherency, e.g. same view to multiple users
    • Y10S707/99953—Recoverability
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99951—File or database maintenance
    • Y10S707/99956—File allocation

Abstract

A portable electronic device includes a log-structured file system implemented in flash memory. The log-structured file system includes a write function for storing contiguous data records to the flash memory in the form of at least one data log, although the system may write data records to the flash memory using a plurality of data logs. The log-structured file system also includes a read function for retrieving data records from the one or more logs using a plurality of memory mapped pointers, which may be stored in an associated RAM index, or which may be implemented as an index stored in the flash memory. A clean-log function is also provided for eliminating inactive records from the log so that new data can be appended to the end of the log. The various functions associated with the log-structured file system are implemented as at least three software modules, a read module, a write module and a clean-log module, although other configurations are possible. The portable electronic device may include a two-way RF transceiver for sending and receiving data from the device, and may also include a plurality of application programs that are configured to interact with the log-structured file system, as well as other software modules for controlling the operation of the portable electronic device.
CA002305985A 1999-04-19 2000-04-18 Portable electronic device having a log-structured file system in flash memory Expired - Lifetime CA2305985C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA002429250A CA2429250C (en) 1999-04-19 2000-04-18 Portable electronic device having a log-structured file system in flash memory

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/294,934 1999-04-19
US09/294,934 US6535949B1 (en) 1999-04-19 1999-04-19 Portable electronic device having a log-structured file system in flash memory

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA002429250A Division CA2429250C (en) 1999-04-19 2000-04-18 Portable electronic device having a log-structured file system in flash memory

Publications (2)

Publication Number Publication Date
CA2305985A1 true CA2305985A1 (en) 2000-10-19
CA2305985C CA2305985C (en) 2003-08-19

Family

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Family Applications (1)

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CA002305985A Expired - Lifetime CA2305985C (en) 1999-04-19 2000-04-18 Portable electronic device having a log-structured file system in flash memory

Country Status (4)

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US (1) US6535949B1 (en)
EP (1) EP1046980B1 (en)
CA (1) CA2305985C (en)
DE (1) DE60042534D1 (en)

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EP1046980B1 (en) 2009-07-15
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EP1046980A3 (en) 2006-08-16
EP1046980A2 (en) 2000-10-25
CA2305985C (en) 2003-08-19

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