WO2002019110B1 - Manipulation of zombie files and evil-twin files - Google Patents

Manipulation of zombie files and evil-twin files

Info

Publication number
WO2002019110B1
WO2002019110B1 PCT/US2001/025901 US0125901W WO0219110B1 WO 2002019110 B1 WO2002019110 B1 WO 2002019110B1 US 0125901 W US0125901 W US 0125901W WO 0219110 B1 WO0219110 B1 WO 0219110B1
Authority
WO
WIPO (PCT)
Prior art keywords
filespace
file
zombie
live
breaking
Prior art date
Application number
PCT/US2001/025901
Other languages
French (fr)
Other versions
WO2002019110A3 (en
WO2002019110A2 (en
Inventor
Ray Chen
John K Edwards
Kayuri Patel
Original Assignee
Network Appliance Inc
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 Network Appliance Inc filed Critical Network Appliance Inc
Priority to EP01964187A priority Critical patent/EP1311948A2/en
Publication of WO2002019110A2 publication Critical patent/WO2002019110A2/en
Publication of WO2002019110A3 publication Critical patent/WO2002019110A3/en
Publication of WO2002019110B1 publication Critical patent/WO2002019110B1/en

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1435—Saving, restoring, recovering or retrying at system level using file system or storage system metadata
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/16—File or folder operations, e.g. details of user interfaces specifically adapted to file systems
    • G06F16/162—Delete operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/82—Solving problems relating to consistency
    • 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
    • Y10S707/99931—Database or file accessing
    • 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

The invention provides a method and system for reliably performing extra-long operations in a reliable state-full system (such as a file system). The system records consistency points, or otherwise assures reliability, notwithstanding the continuous performance of extra-long operations and the existence of intermediate states for those extra-long operations. Moreover, performance of extra-long operations is both deterministic and atomic with regard to consistency points (or other reliability techniques used by the system). The file system includes a separate portion of the file system reserved for files having extra-long operations in progress, including file deletion and file truncation. This separate portion of the file system is called the zombie filespace; it includes a separate name space from the regular ('live') file system that is accessible to users, and is maintained as part of the file system when recording a consistency point. The file system includes a file deletion manager that determines, before beginning any file deletion operation, whether it is necessary to first move the file being deleted to the zombie filespace. The file system includes a zombie file deletion manager that performs portions of the file deletion operation on zombie files in atomic units. The file system also includes a file truncation manager that determines, before beginning any file truncation operation, whether it is necessary to create a complementary file called an 'evil twin'. The truncation manager will move all blocks to be truncated from the file being truncated to the evil twin file. The file system includes a zombie file truncation manager that performs portions of the file truncation operation on the evil-twin file in atomic units. An additional advantage provided by the file system is that files having attached data elements, called 'composite' files, can be subject to file deletion and other extra-long operations in a natural and reliable manner. The file system moves the entire composite file to the zombie filespace, deletes each attached data element individually, and thus resolves the composite file into a non-composite file. If the non-composite file is sufficiently small, the file deletion manager can delete the non-composite file without further need for the zombie filespace. However, if the non-composite file is sufficiently large, the file deletion manager can delete the non-composite file using the zombie filespace.

Claims

AMENDED CLAIMS[received by the International Bureau on 23 September 2002 (23.09.02); original claims 1 -29 replaced by new claims 1 -32 (6 pages)]
1. A method of operating a filesystem, said filesystem including a live filespace accessible to users and a zombie filespace not accessible to users, said method including using the zombie filespace in conjunction with files having extra-long operations in progress.
2. A method as in claim 1, wherein using the zombie filespace further comprises the step of recording changes to said zombie filespace in a persistent memory.
3. A method as in claim 2, including, for a deletion operation on a file in said live filespace, transferring said file from said live filespace to said zombie filespace; breaking links associating disk blocks with said file in a plurality of steps while said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect said deletion operation.
4. A method as in claim 2, including, for a truncation operation on a file in said live filespace, transferring at least a portion of said file from said live filespace to said zombie filespace; breaking links associating disk blocks with said file in a plurality of steps while a portion of said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect changes associated with said breaking of links.
5. A method as in claim 2, including, for an operation apparent to users as substantially atomic, performing said operation in a plurality of steps using said zombie filespace, wherein said recording changes is performed in said persistent memory for each of said plurality of steps.
22
6. A method as in claim 2, including, for an operation performed on a file having attached data elements, performing said operation using said zombie filespace.
7. A method as in claim 2, including, for an operation performed using said zombie filespace, altering a size of said zombie filespace during performance of said operation.
8. A method as in claim 2, including, for an operation performed using said zombie filespace, checkpointing said filesystem during performance of said operation.
9. A method as in claim 2, including recording changes to said live filespace in said persistent memory, wherein records of changes to said live filespace and of changes to said zombie filespace are substantially interspersed.
10. A method as in claim 2, including replaying a set of said changes in response to said record.
11. A method as in claim 2, including replaying a set of said changes to said live filespace and to said zombie filespace, wherein replay of changes includes substantial interspersed performance of changes to said live filespace and to said zombie filespace.
12. A method as in claim 2, including replaying a set of said changes in said record in response to a crash recovery by said filesystem.
13. A method as in claim 2, wherein said persistent memory includes a log of substantially all changes, within a selected time duration, to either said live filespace or said zombie filespace.
14. A method as in claim 2, wherein said persistent memory includes a log of substantially all changes, within a selected time duration, to said zombie filespace.
15. A method as in claim 2, wherein said recorded changes include a sef of substantially atomic operations to said zombie filespace.
16. A method as in claim 1, wherein using the zombie filespace further comprises the step of dynamically growing said zombie filespace.
17. A method as in claim 16, including, for a deletion or truncation operation on a file in said live filespace, allocating storage within said zombie filespace for metadata associated with said file; performing said dynamic growth in response to failure of said allocation of storage; re-performing said allocation of storage after said dynamic growth; and transferring said file from said live filespace to said zombie filespace.
18. A method as in claim 16, wherein said dynamic growth occurs, for an operation performed using said zombie filespace, during performance of said operation.
19. A method as in claim 1 , wherein using the zombie filespace further comprises the step of transferring a file to said zombie filespace before breaking links to blocks in said file, in response to an operation on said file.
20. A method as in claim 19, wherein, for a deletion operation on a file in said live filespace, said transfer includes creating a link associating said file with said zombie filespace; and breaking a link associating said file with said live filespace; and said deletion operation includes breaking links associating disk blocks with said file in a plurality of steps while said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect said deletion operation.
24
21. A method as in claim 19, wherein, for a truncation operation on a file in said live filespace, said transfer includes creating a link associating at least a portion of said file with said zombie filespace; and breaking a link associating said portion with said file in said live filespace; and said truncation operation includes breaking links associating disk blocks with said file in a plurality of steps while a portion of said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect changes associated with said breaking of links.
22. A method as in claim 1, wherein using the zombie filespace further comprises the step of transferring a file to said zombie filespace before performing any substantial portion of an operation on said file.
23. A method as in claim 22, wherein, for a deletion operation on a file in said live filespace, said transfer includes creating a link associating said file with said zombie filespace; and breaking a link associating said file with said live filespace; and said deletion operation includes breaking links associating disk blocks with said file in a plurality of steps only while said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect said deletion operation.
24. A method as in claim 22, wherein, for a truncation operation on a file in said live filespace, said transfer includes creating a link associating at least a portion of said file with said zombie filespace; and
25 breaking a link associating said portion with said file in said live filespace; and said truncation operation includes breaking links associating disk blocks with said file in a plurality of steps only while a portion of said file is associated with said zombie filespace, wherein said recording of changes includes recording said breaking of links in a plurality of steps; and altering said live filespace to reflect changes associated with said breaking of links.
25. A method as in claim 1, wherein using the zombie filespace further comprises the step of replaying an operation on a file.
26. A method as in claim 25, wherein said replay is responsive to a set of recorded changes in a persistent memory; and including, for a deletion operation on a file in said live filespace, transferring said file from said live filespace to said zombie filespace, and recording said transfer in said persistent memory; breaking links associating disk blocks with said file in a plurality of steps while said file is associated with said zombie filespace, and recording said breaking of links in said persistent memory in a plurality of steps; and altering said live filespace to reflect said deletion operation, and recording said alteration in said persistent memory.
27. A method as in claim 25, wherein said replay is responsive to a set of recorded changes in a persistent memory; and including, for a truncation operation on a file in said live filespace, transferring at least a portion of said file from said live filespace to said zombie filespace, and recording said transfer in said persistent memory; breaking links associating disk blocks with said file in a plurality of steps while a portion of said file is associated with said zombie filespace, and recording said breaking of links in said persistent memory in a plurality of steps; and altering said live filespace to reflect changes associated with said breaking of links, and recording said alteration in said persistent memory.
26
28. A method as in claim 1, wherein using the zombie filespace further comprises the step of replaying a set of filesystem operations, said operations including at least some operations using said live filespace and at least some operations using said zombie filespace.
29. A method as in claim 28, wherein said replay is responsive to a set of recorded changes in a persistent memory; and including, for a deletion operation on a file in said live filespace, transferring said file from said live filespace to said zombie filespace, and recording said transfer in said persistent memory; breaking links associating disk blocks with said file in a plurality of steps while said file is associated with said zombie filespace, and recording said breaking of links in said persistent memory in a plurality of steps; and altering said live filespace to reflect said deletion operation, and recording said alteration in said persistent memory.
30. A method as in claim 28, wherein said replay is responsive to a set of recorded changes in a persistent memory; and including, for a truncation operation on a file in said live filespace, transferring at least a portion of said file from said live filespace to said zombie filespace, and recording said transfer in said persistent memory; breaking links associating disk blocks with said file in a plurality of steps while a portion of said file is associated with said zombie filespace, and recording said breaking of links in said persistent memory in a plurality of steps; and altering said live filespace to reflect changes associated with said breaking of links, and recording said alteration in said persistent memory.
31. A filesystem that effects the steps of any one of claims 1 to 30.
32. A computer program comprising program code means that, when executed on a computer system, cause the computer system to effect the steps of any one of claims 1 to 30.
27
PCT/US2001/025901 2000-08-18 2001-08-17 Manipulation of zombie files and evil-twin files WO2002019110A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP01964187A EP1311948A2 (en) 2000-08-18 2001-08-17 Manipulation of zombie files and evil-twin files

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/642,066 2000-08-18
US09/642,066 US6751635B1 (en) 2000-08-18 2000-08-18 File deletion and truncation using a zombie file space

Publications (3)

Publication Number Publication Date
WO2002019110A2 WO2002019110A2 (en) 2002-03-07
WO2002019110A3 WO2002019110A3 (en) 2002-10-31
WO2002019110B1 true WO2002019110B1 (en) 2003-02-20

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US (3) US6751635B1 (en)
EP (1) EP1311948A2 (en)
WO (1) WO2002019110A2 (en)

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US7451165B2 (en) 2008-11-11
US7305424B2 (en) 2007-12-04
WO2002019110A2 (en) 2002-03-07
US20050033775A1 (en) 2005-02-10
US20020083081A1 (en) 2002-06-27
EP1311948A2 (en) 2003-05-21
US6751635B1 (en) 2004-06-15

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