JP6110020B2 - 参照カウンタ完全性チェック - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/20—Information retrieval; Database structures therefor; File system structures therefor of structured data, e.g. relational data
- G06F16/21—Design, administration or maintenance of databases
- G06F16/215—Improving data quality; Data cleansing, e.g. de-duplication, removing invalid entries or correcting typographical errors
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/0223—User address space allocation, e.g. contiguous or non contiguous base addressing
- G06F12/023—Free address space management
- G06F12/0253—Garbage collection, i.e. reclamation of unreferenced memory
- G06F12/0261—Garbage collection, i.e. reclamation of unreferenced memory using reference counting
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Description
本出願は、2013年4月23日に申請された米国仮出願第61/815215号の利益を主張する。前述された出願の開示は、本明細書においてすべての目的のために参照により援用される。
(a[+]b)[+]c=a[+](b[+]c),
a[+]b=b[+]c
が当てはまらなければならない。
a[+]b=c,
c[−]b=a
によって定義される。
Claims (24)
- ファイルシステムにおけるオブジェクトの参照カウンタの完全性をチェックする方法であって、当該方法は、
前記オブジェクトに参照チェックを関連付けるステップであり、前記参照チェックは、前記オブジェクトを参照するいかなる参照も追加される前、所定初期値に設定される、ステップと、
前記オブジェクトを参照する各参照に一意識別子を関連付けるステップと、
前記オブジェクトに関連付けられた参照チェックに対して、参照に関連付けられた一意識別子を加算し及び減算する2項演算のペアを決定するステップと、
を含み、
前記オブジェクトを参照する新しい参照が追加されることに応答して、当該方法は、
前記参照カウンタを1だけ増やすステップと、
前記参照チェックに対して、前記新しい参照に関連付けられた一意識別子を加算するステップと、
をさらに含み、
前記オブジェクトを参照する既存の参照が除去されることに応答して、当該方法は、
前記オブジェクトの参照カウンタを1だけ減らすステップと、
前記参照チェックから、前記既存の参照に関連付けられた一意識別子を減算するステップと、
前記参照カウンタがゼロに等しいと決定するステップと、
前記参照チェックが前記所定初期値に等しいと決定するステップと、
前記参照チェックが前記所定初期値に等しくない場合、前記ファイルシステムにエラーメッセージを送るステップと、
をさらに含む、
方法。 - 前記オブジェクトにおいて参照している参照に関連付けられた一意識別子は、前記オブジェクトのハッシュを圧縮することによって決定される、請求項1に記載の方法。
- 前記オブジェクトのハッシュを圧縮することは、前記オブジェクトのハッシュの先頭64ビットを切り詰めることを含む、請求項2に記載の方法。
- 前記オブジェクトのハッシュはハッシュ関数によって決定される、請求項2に記載の方法。
- 前記ハッシュ関数はSHAファミリーの暗号学的ハッシュ関数の1つである、請求項4に記載の方法。
- 前記ハッシュ関数はTigerハッシュ関数の1つである、請求項4に記載の方法。
- 前記加算の2項演算は結合性及び可換性を有する、請求項1に記載の方法。
- 前記減算の2項演算([−])は、前記加算の2項演算([+])を用いて、任意の一意識別子a、b及びcについて、
a[+]b=c,
c[−]b=a
の式により定義される、請求項1に記載の方法。 - 前記加算の2項演算は規則的な整数加算である、請求項1に記載の方法。
- 前記加算の2項演算はビット単位のXOR演算である、請求項1に記載の方法。
- 前記オブジェクトの参照カウンタが1に等しいと決定するステップと、
一組のあり得る参照を受け取るステップと、
前記参照カウンタが1に等しい場合、前記一組のあり得る参照からの各参照の一意識別子と前記オブジェクトに関連付けられた参照チェックと比較して、前記オブジェクトを参照している可能性が高い参照を決定するステップと、
をさらに含む請求項1に記載の方法。 - 前記オブジェクトの参照カウンタが1より大きいと決定するステップと、
一組のあり得る参照を受け取るステップと、
前記参照カウンタが1より大きい場合、
前記一組のあり得る参照から参照の組み合わせを選択するステップ、
前記参照の組み合わせからの参照に関連付けられた一意識別子の総和を算出するステップ、及び
前記総和と前記オブジェクトの参照チェックとを比較するステップ、
によって、前記オブジェクトを参照する参照のリストを決定するステップと、
をさらに含む請求項1に記載の方法。 - 命令を記憶させた非一時的プロセッサ可読媒体であって、前記命令は、1又は複数のプロセッサにより実行されると、オブジェクトの参照カウンタの完全性をチェックする方法のステップを前記1又は複数のプロセッサに実行させ、前記方法は、
前記オブジェクトに参照チェックを関連付けるステップであり、前記参照チェックは、前記オブジェクトを参照するいかなる参照も追加される前、所定初期値に設定される、ステップと、
前記オブジェクトを参照する各参照に一意識別子を関連付けるステップと、
前記オブジェクトに関連付けられた参照チェックに対して、参照に関連付けられた一意識別子を加算し及び減算する2項演算のペアを決定するステップと、
前記オブジェクトを参照する新しい参照が追加されるとき、
前記参照カウンタを1だけ増やすステップと、
前記参照チェックに対して、前記新しい参照に関連付けられた一意識別子を加算するステップと、
前記オブジェクトを参照する既存の参照が除去されるとき、
前記オブジェクトの参照カウンタを1だけ減らすステップと、
前記参照チェックから、前記既存の参照に関連付けられた一意識別子を減算するステップと、
前記参照カウンタがゼロに等しいと決定するステップと、
前記参照カウンタがゼロに等しい場合、
前記参照チェックが前記所定初期値に等しいと決定するステップと、
前記参照チェックが前記所定初期値に等しくない場合、ファイルシステムにエラーメッセージを送るステップと、
を含む、非一時的プロセッサ可読媒体。 - 前記オブジェクトにおいて参照している参照に関連付けられた一意識別子は、前記オブジェクトのハッシュを圧縮することによって決定される、請求項13に記載の非一時的プロセッサ可読媒体。
- 前記オブジェクトのハッシュを圧縮することは、前記オブジェクトのハッシュの先頭64ビットを切り詰めることを含む、請求項14に記載の非一時的プロセッサ可読媒体。
- 前記オブジェクトのハッシュはハッシュ関数によって決定される、請求項14に記載の非一時的プロセッサ可読媒体。
- 前記ハッシュ関数はSHAファミリーの暗号学的ハッシュ関数の1つである、請求項16に記載の非一時的プロセッサ可読媒体。
- 前記ハッシュ関数はTigerハッシュ関数の1つである、請求項16に記載の非一時的プロセッサ可読媒体。
- 前記加算の2項演算は結合性及び可換性を有する、請求項13に記載の非一時的プロセッサ可読媒体。
- 前記減算の2項演算([−])は、前記加算の2項演算([+])を用いて、任意の一意識別子a、b及びcについて、
a[+]b=c,
c[−]b=a
の式により定義される、請求項13に記載の非一時的プロセッサ可読媒体。 - 前記加算の2項演算は規則的な整数加算である、請求項13に記載の非一時的プロセッサ可読媒体。
- 前記加算の2項演算はビット単位のXOR演算である、請求項13に記載の非一時的プロセッサ可読媒体。
- 前記方法は、
前記オブジェクトの参照カウンタが1に等しいと決定するステップと、
一組のあり得る参照を受け取るステップと、
前記参照カウンタが1に等しい場合、前記一組のあり得る参照からの各参照の一意識別子と前記オブジェクトに関連付けられた参照チェックと比較して、前記オブジェクトを参照している可能性が高い参照を決定するステップと、
をさらに含む、請求項13に記載の非一時的プロセッサ可読媒体。 - 前記方法は、
前記オブジェクトの参照カウンタが1より大きいことをチェックするステップと、
一組のあり得る参照を受け取るステップと、
前記参照カウンタが1より大きい場合、
前記一組のあり得る参照から参照の組み合わせを選択するステップ、
前記参照の組み合わせからの参照に関連付けられた一意識別子の総和を算出するステップ、及び
前記総和と前記オブジェクトの参照チェックとを比較するステップ、
によって、前記オブジェクトを参照する参照のリストを決定するステップと、
をさらに含む、請求項13に記載の非一時的プロセッサ可読媒体。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361815215P | 2013-04-23 | 2013-04-23 | |
US61/815,215 | 2013-04-23 | ||
US14/257,905 US9552382B2 (en) | 2013-04-23 | 2014-04-21 | Reference counter integrity checking |
US14/257,905 | 2014-04-21 | ||
PCT/US2014/035008 WO2014176264A1 (en) | 2013-04-23 | 2014-04-22 | Reference counter integrity checking |
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JP2016520910A JP2016520910A (ja) | 2016-07-14 |
JP6110020B2 true JP6110020B2 (ja) | 2017-04-05 |
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US (1) | US9552382B2 (ja) |
EP (1) | EP2989549A4 (ja) |
JP (1) | JP6110020B2 (ja) |
WO (1) | WO2014176264A1 (ja) |
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