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| author | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-21 09:03:38 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-21 09:03:38 +0100 |
| commit | 4604096768d3be37ee1a05aee424aceed3e1b56f (patch) | |
| tree | 56010e180bb32be7e57971e4bb617c28d0d09099 /Documentation | |
| parent | Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/... (diff) | |
| parent | [PATCH] block: document io scheduler allow_merge_fn hook (diff) | |
| download | linux-4604096768d3be37ee1a05aee424aceed3e1b56f.tar.xz linux-4604096768d3be37ee1a05aee424aceed3e1b56f.zip | |
Merge branch 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block
* 'for-linus' of git://brick.kernel.dk/data/git/linux-2.6-block:
[PATCH] block: document io scheduler allow_merge_fn hook
[PATCH] cfq-iosched: don't allow sync merges across queues
[PATCH] Fixup blk_rq_unmap_user() API
[PATCH] __blk_rq_unmap_user() fails to return error
[PATCH] __blk_rq_map_user() doesn't need to grab the queue_lock
[PATCH] Remove queue merging hooks
[PATCH] ->nr_sectors and ->hard_nr_sectors are not used for BLOCK_PC requests
[PATCH] cciss: fix XFER_READ/XFER_WRITE in do_cciss_request
[PATCH] cciss: set default raid level when reading geometry fails
Diffstat (limited to 'Documentation')
| -rw-r--r-- | 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 c6c9a9c10d7f..3adaace328a6 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 |