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authorDmitry Torokhov <dtor@insightbb.com>2007-02-10 01:26:32 -0500
committerDmitry Torokhov <dtor@insightbb.com>2007-02-10 01:26:32 -0500
commitb22364c8eec89e6b0c081a237f3b6348df87796f (patch)
tree233a923281fb640106465d076997ff511efb6edf /Documentation/block/biodoc.txt
parent2c8dc071517ec2843869024dc82be2e246f41064 (diff)
parent66efc5a7e3061c3597ac43a8bb1026488d57e66b (diff)
Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'Documentation/block/biodoc.txt')
-rw-r--r--Documentation/block/biodoc.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt
index c6c9a9c10d7..3adaace328a 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