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Table of Contents
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Sec 6-5
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Chaining of Portions
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Free Storage Management
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The free portions may be chained together through the free-space portions themselves This method is also applicable when portions are smaller, for instance, in block-based allocation It has negligible space overhead since it uses free space for storage of the free storage-control data Only one, or a few, header entries are kept in a pseudo le entry When space is needed, the headers from the portions are fetched one by one to determine the next suitable free portion in the chain Then the portion is removed from the chain and the chain is rewritten, taking care again not to leave the free storage control data vulnerable to system failure Multiple chains may be kept to group cylinders or sectors in order to create e cient user les mumps uses free chains in that manner (Fig 4-28) If variablelength portions are being allocated, there may be multiple chains to implement a best- t algorithm Files will obtain portions from the chain appropriate for the size of portions required, and large portions are preserved until needed Chained free-storage management does not keep track of data allocated to the user s le It is desirable for the operating system to be cognizant of all allocations made When there is no table of contents, this can be achieved by an extension of the chaining method The allocated portions are chained together for each le using a header similar to the header used for free storage management The relative space overhead to do this depends on the size of the portions allocated but will be bearable unless portions are of a size much less than a thousand bytes
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Bit Tables
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A third approach to manage free space is to keep a bit table This method uses an array containing one bit per portion in the system It is used only when all portion sizes are the same, generally equal to one block Each entry of a 0 indicates a corresponding free portion, and a 1 indicates a portion which is in use The list of portions allocated to a speci c le is kept as part of the le mechanism A bit table has the advantage that large sections of the table can be kept in core memory and that the allocation and deallocation cost is minimal This advantage is important in highly dynamic environments The tables, on the other hand, are quite vulnerable to errors, so that they tend to be practical only where the le system keeps track of its allocation in a manner which can be used by the operating system It is then possible to reconstruct or verify the bit table by checking through all the individual le tables File systems themselves can also use bit tables to locate their member portions The use of bit tables is especially e ective where the portion-allocation data does not have to be kept in serial order Bit tables for a speci c le tend to be very sparse, but their e ciency can be increased by a technique of packing The packing of a sparse bit table is achieved by indexing groups of the bit array A group which has only zero entries is indexed by a zero, and not actually represented The index itself can be recursively grouped and indexed Figure 6-20 illustrates this technique for File B Bit arrays have also been used where portions, or records, are being shared by multiple les Since no space is required within the portion, there is no limit to the number of owners that such a portion can have We see that there are a number of possibly con icting objectives in the design of a free-storage management algorithm The primary con ict is again speed versus
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