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File System Implementation

Explain why logging metadata updates ensures recovery of afile system after a file-system crash.
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Hi,All metadata changes are written sequentially to a log. Eachset of operations that performs a specific task is a transaction.Once the changes arewritten to this log, they are considered to becommitted, and system call can return to the user process, allowingit to continue execution.

If the system crashes, there will be zero or more transactionsin the log file. Those transactions were never completed to thefile system, so they mustbe completed. The transactions can beexecuted from the pointer until the work is completed, and thefile-system structures remain consistent.

The only problem occurs to when a transaction has beenaborted. That is it was not committed before the system crashed.Any changes from thosetransaction systems must be undone, againpreserving the consistency of file system. This recovery is allthat is needed after a crash, eliminating allproblems withconsistency checking.Thanq, if u have any doubt post the question.
answered by: Calc Student
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