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autofs4: deal with autofs4_write/autofs4_write races
Just serialize the actual writing of packets into pipe on a new mutex, independent from everything else in the locking hierarchy. As soon as something has started feeding a piece of packet into the pipe to daemon, we *want* everything else about to try the same to wait until we are done. Acked-by: Ian Kent <[email protected]> Signed-off-by: Al Viro <[email protected]>
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Al Viro
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Jan 11, 2012
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