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| author | Nikanth Karthikesan <knikanth@suse.de> | 2009-01-27 09:29:24 +0100 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2009-01-30 12:34:37 +0100 |
| commit | 7598909e3ee2a08726276d6415b69dadb52d0d76 (patch) | |
| tree | a876f1691934bcd0e2a3787837ba997e2834b15c /Documentation | |
| parent | a229fc61ef0ee3c30fd193beee0eeb87410227f1 (diff) | |
| download | lwn-7598909e3ee2a08726276d6415b69dadb52d0d76.tar.gz lwn-7598909e3ee2a08726276d6415b69dadb52d0d76.zip | |
Mark mandatory elevator functions in the biodoc.txt
biodoc.txt mentions that elevator functions marked with * are mandatory, but
no function is marked with *. Mark the 3 functions which should be
implemented by any io scheduler.
Signed-off-by: Nikanth Karthikesan <knikanth@suse.de>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/block/biodoc.txt | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 5d2480d33b43..ecad6ee75705 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt @@ -954,14 +954,14 @@ elevator_allow_merge_fn called whenever the block layer determines results in some sort of conflict internally, this hook allows it to do that. -elevator_dispatch_fn fills the dispatch queue with ready requests. +elevator_dispatch_fn* fills the dispatch queue with ready requests. I/O schedulers are free to postpone requests by not filling the dispatch queue unless @force is non-zero. Once dispatched, I/O schedulers are not allowed to manipulate the requests - they belong to generic dispatch queue. -elevator_add_req_fn called to add a new request into the scheduler +elevator_add_req_fn* called to add a new request into the scheduler elevator_queue_empty_fn returns true if the merge queue is empty. Drivers shouldn't use this, but rather check @@ -991,7 +991,7 @@ elevator_activate_req_fn Called when device driver first sees a request. elevator_deactivate_req_fn Called when device driver decides to delay a request by requeueing it. -elevator_init_fn +elevator_init_fn* elevator_exit_fn Allocate and free any elevator specific storage for a queue. |