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...Journaling file systems record each update to the system as a transaction becoming common on many operating all transactions are written sequentially log is considered committed once it user process can continue execution computer science dept cs spring april r mak cont d in asynchronously replayed structures when modified removed from if crashes remaining must still be performed faster recovery crash removes chance of inconsistency metadata virtual vfs unix provides an object oriented way implement allows same call interface api used for different types separate generic operations implementation details one or network vnodes which hold inodes rather than any specific type dispatch operation appropriate routines schematic view th concepts edition silberschatz galvin and gagne c john wiley sons rights reserved...