Invalidating cache due to ioctl

A de-duplication is configured to cache data for access by a plurality of different storage clients, such as virtual machines.

A virtual machine may comprise a virtual machine de-duplication module configured to identify data for admission into the de-duplication cache. A de-duplication is configured to cache data for access by a plurality of different storage clients, such as virtual machines.

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The virtual machines may use similar operating systems and applications.

* * In other words, for this blockmap, if * *fromoffset = 3 * blocksize, * 1 1 0 0 0 1 1 1 1 1 1 1 1 1 0 0 * *nextpage = 0 * *nextoffset = 5 * blocksize * *nextlength = 6 * blocksize *//* * Copy out either the history buffer size, or the entire history buffer.

* * Note that the cache must be shut down before calling this function in * order to avoid a race around the entry count/buffer size.

* * Armed with a sorted version of this read pattern (the "playlist"), we * cluster the reads into a private cache, taking advantage of the * sequential I/O pattern.

Incoming read requests are then satisfied from * the cache (if possible), or by forwarding to the original strategy routine.

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* - Wait for the operation(s) of interest to be performed. * * Loading a read pattern initialises the cache; upon successful loading * the cache is active and readhead is being performed.

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