Extending cluster allocations in an extensible file system
First Claim
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1. A computer-readable storage medium on which computer-executable instructions are stored which, when executed by a computing device, cause the computing device to:
- access a directory entry that specifies information concerning data in a file system, the directory entry containing a flag that indicates whether the data is stored in a contiguous chain of clusters;
determine that the data is stored in the contiguous cluster chain based on the flag; and
thereafter,identify the clusters of the contiguous cluster chain that store the data without traversing a file allocation table associated with the file system based on other information, the other information comprising information within the directory entry specifying a starting cluster and information indicative of a size of the cluster chain.
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Abstract
An extensible file system format for portable storage media is provided. The extensible file system format includes the specification of primary and secondary directory entry types that may be custom defined. The primary and secondary directory entry types can be further classified as critical and benign directory entries. The directory entry types can define whether a cluster chain corresponding to a file can be contiguously allocated.
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Citations
15 Claims
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1. A computer-readable storage medium on which computer-executable instructions are stored which, when executed by a computing device, cause the computing device to:
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access a directory entry that specifies information concerning data in a file system, the directory entry containing a flag that indicates whether the data is stored in a contiguous chain of clusters; determine that the data is stored in the contiguous cluster chain based on the flag; and
thereafter,identify the clusters of the contiguous cluster chain that store the data without traversing a file allocation table associated with the file system based on other information, the other information comprising information within the directory entry specifying a starting cluster and information indicative of a size of the cluster chain. - View Dependent Claims (2, 3, 4, 5)
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6. A method performed by a computing device comprising:
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accessing a directory entry for specifying information concerning data in a file system, the directory entry containing a flag that indicates whether the data is stored in a contiguous cluster chain; determining that the data in the file system is stored in the contiguous cluster chain based on the flag; obtaining starting cluster information and a cluster chain size associated with the plurality of contiguously allocated clusters; and identifying each cluster in the contiguous cluster chain that stores the data in the file system without traversing a file allocation table associated with the file system based on the determination that the data is stored in the contiguous cluster chain, the starting cluster information, and the cluster chain size. - View Dependent Claims (7, 8, 9, 10)
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11. A computing device comprising a processor and memory, the processor configured to:
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access a directory entry that specifies information concerning data in a file system, the directory entry containing a flag that indicates whether the data is stored in a contiguous cluster chain; determine that the data in the directory is stored in the contiguous cluster chain based on the flag; and
thereafter,identify each cluster in the contiguous cluster chain that store the data without traversing a file allocation table associated with the file system based on other information, the other information comprising information within the directory entry specifying a starting cluster and information indicative of a size of the cluster chain. - View Dependent Claims (12, 13, 14, 15)
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Specification