staging: lustre: change sai_thread to sai_task.

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Rather than allocating a ptlrpc_thread for the
stat-ahead thread, just use the task_struct provided
by kthreads directly.

As nothing ever waits for the sai_task, it must call do_exit()
directly rather than simply return from the function.
Also it cannot use kthread_should_stop() to know when to stop.

There is one caller which can ask it to stop so we need a simple
signaling mechanism.  I've chosen to set ->sai_task to NULL
when the thread should finish up.  The thread notices this and
cleans up and exits.
lli_sa_lock is used to avoid races between waking up the process
and the process exiting.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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NeilBrown 2018-03-02 10:31:25 +11:00 • committed by Greg Kroah-Hartman

parent c044fb0f83

commit 165020462d

2 changed files with 54 additions and 66 deletions

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2

drivers/staging/lustre/lustre/llite/llite_internal.h

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118

drivers/staging/lustre/lustre/llite/statahead.c

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