practical-case-study-e-operating-systems-programming--300698-1-introduction-in-this-workshop-you-will-be-implementing-a-file-system-simulator-loosely-based-on-historic-file-systems-the-file-system-will-be-have-the-following-properties--it-is-a-single-level-directory-system--the-directory-entry-has-the-following-format-struct-entry--char-user-char-name9-char-extension4-short-blockcount-short-block8--with-the-name-and-extension-fields-being-c-strings-this-structure-is-32-bytes-in-size--the-disk-size-is-160-kbyte-this-is-roughly-one-side-of-a-5-1-4-00-inch-disk--the-smallest-unit-of-allocation-is-1-kbyte--the-main-directory-occupies-the-first-block-of-the-disk-block-0-and-its-size-is-fixed-at-1-block-so-there-can-only-be-32-files-in-this-file-system--as-the-directory-always-occupies-only-the-first-block-therefore-no-control-information-about-it-needs-to-be-stored-in-the-directory-ie-no--entry--the-only-user-is-user-1--user-1-is-not-a-valid-user-and-could-be-used-to-mark-free-directory-entries--alongside-the-directory-you-also-need-a-bitmap-that-is-capable-of-representing-all-of-the-blocks-available-on-the-disk-this-can-be-a-free-space-bitmap-or-an-allocation-bitmap-this-is-your-choice-this-structure-is-not-stored-on-the-disk-but-would-be-computed-by-the-operating-system-when-the-disk-was-inserted-you-are-not-supposed-to-implement-the-actual-storage-only-the-control-structures-of-the-file-system-when-implementing-the-free-bitmap-you-must-use-a-bitmap-ie-it-should-be-an-array-but-each-element-of-the-array-should-represent-several-blocks-1-2-programming-tasks-when-your-program-starts-it-will-assume-that-the-disk-is-unformatted-you-should-provide-a-menu-that-implements-the-following-options-initialise-disk-initialise-disk-control-structures-setting-the-first-block-of-the-disk-to-used-in-the-bitmap-and-marking-all-directory-entries-as-being-available-list-files-in-the-directory-list-the-names-extensions-and-block-counts-of-all-the-valid-files-in-the-directory-display-the-free-bitmap-print-the-value-of-each-of-the-bits-in-the-bitmap-this-need-not-be-pretty-just-a-long-list-of-1s-and-0s-is-sufficient-opencreate-file-scans-the-directory-and-if-the-name-provided-doesnt-exist-then-adds-that-file-to-the-directory-this-file-will-be-used-in-all-subsequent-operations-until-a-new-file-is-opened-or-it-is-deleted-read-file-list-the-blocks-occupied-by-the-currently-open-file-not-the-content-of-these-blocks-as-you-dont-store-this-information-write-file-allocate-another-block-to-the-currently-open-file-you-should-not-preallocate-blocks-for-the-file-you-should-allocate-the-first-available-block-by-scanning-the-bitmap-for-the-first-block-that-is-available-each-write-shall-add-another-block-to-the-file-until-there-are-no-more-slots-to-allocate-blocks-to-or-the-disk-runs-out-of-blocks-there-are-only-8-slots-available-for-each-file-delete-file-deallocate-all-blocks-for-the-current-file-in-the-bitmap-and-marks-as-free-the-directory-entry-for-that-file-you-need-to-pay-close-attention-to-multiple-boundary-conditions-which-exist-in-this-file-system-including-the-total-size-of-the-disk-maximum-size-of-a-file-maximum-number-of-files-etc-2-3-file-fsh-ifndef-fsh-define-fsh--prevent-multiple-inclusion--includestdinth--fsh--various-definitions-for-osp-practical-case-study-e---the-bitmap--extern-uint8t-bitmap20--160kb-disk-with-1kb-blocks--160-bits-for-bitmap---20-bytes---the-directory-entry--struct-entry--char-user-char-name9-char-extension4-short-blockcount-short-block8---the-directory--extern-struct-entry-directory32--extern-means-its-defined-in-another-file-prevents-multiple-definition-errors--int-togglebitint-block--toggles-the-value-of-the-bit-block-in-the-external-array-bitmap-returns-the-current-value-of-the-bit-does-not-validate-block--int-blockstatusint-block--returns-the-status-of-block-in-the-external-array-bitmap-returns-0-if-bitmap-bit-is-0-not-0-if-bitmap-bit-is-1-does-not-validate-block--endif-3-4-file-fsc--fsc-some-useful-functions-for-osp-practical-case-study-e--includefsh-uint8t-bitmap20-struct-entry-directory32-int-togglebitint-block--int-elemblock8-int-posblock8-int-mask1pos-bitmapelemmask-return-bitmapelemmask--int-blockstatusint-block--int-elemblock8-int-posblock8-int-mask1pos-return-bitmapelemmask--5-file-mainc-includestdioh--stdioh-will-be-found-in-the-system-path--includefsh--fsh-will-be-found-in-the-local-path--int-mainint-ac-charav--printfplease-make-me-usefuln-return-0--4-6-file-makefile-all-casee-casee-maino-fso-cc--o-5

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