Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=126ec9a676f601818dc3a85af0552b146410d888
Commit: 126ec9a676f601818dc3a85af0552b146410d888
Parent: da775265021b61d5eb81df155e36cb0810f6df53
Author: Jens Axboe <[EMAIL PROTECTED]>
AuthorDate: Wed Dec 20 11:06:15 2006 +0100
Committer: Jens Axboe <[EMAIL PROTECTED]>
CommitDate: Wed Dec 20 11:06:15 2006 +0100
[PATCH] block: document io scheduler allow_merge_fn hook
Signed-off-by: Jens Axboe <[EMAIL PROTECTED]>
---
Documentation/block/biodoc.txt | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index c6c9a9c..3adaace 100644
--- a/Documentation/block/biodoc.txt
+++ b/Documentation/block/biodoc.txt
@@ -946,6 +946,13 @@ elevator_merged_fn called when a request in the
scheduler has been
scheduler for example, to reposition the request
if its sorting order has changed.
+elevator_allow_merge_fn called whenever the block layer
determines
+ that a bio can be merged into an existing
+ request safely. The io scheduler may still
+ want to stop a merge at this point if it
+ results in some sort of conflict internally,
+ this hook allows it to do that.
+
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
-
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