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authorNeilBrown <neilb@suse.com>2017-10-19 12:49:15 +1100
committerShaohua Li <shli@fb.com>2017-11-01 21:32:20 -0700
commitb03e0ccb5ab9df3efbe51c87843a1ffbecbafa1f (patch)
tree4991194aa067e459500bf1c6515b6d716145165c /drivers/md/md.h
parent35bfc52187f6df8779d0f1cebdb52b7f797baf4e (diff)
downloadop-kernel-dev-b03e0ccb5ab9df3efbe51c87843a1ffbecbafa1f.zip
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md: remove special meaning of ->quiesce(.., 2)
The '2' argument means "wake up anything that is waiting". This is an inelegant part of the design and was added to help support management of suspend_lo/suspend_hi setting. Now that suspend_lo/hi is managed in mddev_suspend/resume, that need is gone. These is still a couple of places where we call 'quiesce' with an argument of '2', but they can safely be changed to call ->quiesce(.., 1); ->quiesce(.., 0) which achieve the same result at the small cost of pausing IO briefly. This removes a small "optimization" from suspend_{hi,lo}_store, but it isn't clear that optimization served a useful purpose. The code now is a lot clearer. Suggested-by: Shaohua Li <shli@kernel.org> Signed-off-by: NeilBrown <neilb@suse.com> Signed-off-by: Shaohua Li <shli@fb.com>
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 03fc641..998b4ce 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -544,12 +544,11 @@ struct md_personality
int (*check_reshape) (struct mddev *mddev);
int (*start_reshape) (struct mddev *mddev);
void (*finish_reshape) (struct mddev *mddev);
- /* quiesce moves between quiescence states
- * 0 - fully active
- * 1 - no new requests allowed
- * others - reserved
+ /* quiesce suspends or resumes internal processing.
+ * 1 - stop new actions and wait for action io to complete
+ * 0 - return to normal behaviour
*/
- void (*quiesce) (struct mddev *mddev, int state);
+ void (*quiesce) (struct mddev *mddev, int quiesce);
/* takeover is used to transition an array from one
* personality to another. The new personality must be able
* to handle the data in the current layout.
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