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File Management: Difference between revisions
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A [[monolithic kernel]] handles everything in one monolithic (hence the name) process. A [[Microkernel]] consists of several processes which are responsible for all the grunt work: allocating memory, managing processes - and housekeeping permanent data storage like hard disks or floppies. Yes, about [[File Systems|filesystems]] the talk is.
Say, we have a file system service. It is responsible for keeping the File System on a Floppy/HD what so ever up to date (and eventually handle pipes and so forth...) The very basic -- the uttermost basic task of the file system service is to keep track of allocated/deallocated blocks and (in case of ext2) inodes - files, to which blocks are allocated - you also need blocks for the file/block management. Another task a file system service usually performs, is keeping blocks in memory for quick access. They are slow to retrieve from disk storage - compared to a simple memory access. So the file system service keeps the so called block cache. Now, think about it: you use paging, you have the file system service as a process of its own. It fetches blocks and keeps them in its
You'll have to do lots of work to transfer the data of a retrieved block to a user process which performs the read() call - or vice versa a write().
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