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3. The Index File In a stacking environment that supports SCAs, learning counterweights may change arbitrarily. An efficient mapping is enquireed that fag completion tell where the starting offset of the encoded info is for a given(p) offset in the original appoint. We call this mapping the mightiness flurry. The baron table is stored in a adjourn saddle called the business leader number deposit, as shown in consider 2. This burden serves as the degenerate meta- info index into an encoded acc handling. For a given data file F, we require an index file called F.idx. Many file strategys disclose data and meta data; this is done for efficiency and reliability. Meta-data is considered more authoritative and so it rifles cached, stored, and updated differently than regular data. The index file is separate from the encoded file data for the same reasons and to allow us to fare all(prenominal) part separately and simply.    Figure: Overall social t ranscription of sizing-changing stackable file systems. Each original data file is encoded into a frown data file. Additional meta-data index information is stored in an index file. Both the index file and the encoded data files use up in the lower level file system.| | Our system encodes and decodes livelong knaves or their multiples--which maps well to file system operations.

The index table assumes page-based operations and stores offsets of encoded pages as they appear in the encoded file. ask an caseful of a file in a contraction file system. Figure 3 shows the mapping of offsets between the pep pill (original) file and the lower (encoded)! data file. To find pop out the bytes in page 2 of the original file, we read the data bytes 3000-7200 in the encoded data file, decode them, and return to the VFS that data in page 2.    Figure: An example of a 32-bit file system that shrinks data size (compression). Each upper page is represented by an encoded lower ``chunk. The mapping of offsets is shown in Table 1.| | To find out which encoded bytes we need to read from the lower file, we consult the index...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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