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| author | Christoph Hellwig <hch@lst.de> | 2017-02-08 16:46:49 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-02-08 23:43:08 +0300 |
| commit | 1e739730c5b9ea80a2f25e9cf6e1025d47e3d8ed (patch) | |
| tree | 4f48ed6c92153fb9941185182e918232eb3472f4 /include/linux/elevator.h | |
| parent | 34fe7c05400663e01e23cddd1fea68bb7a2b3d29 (diff) | |
| download | linux-1e739730c5b9ea80a2f25e9cf6e1025d47e3d8ed.tar.xz | |
block: optionally merge discontiguous discard bios into a single request
Add a new merge strategy that merges discard bios into a request until the
maximum number of discard ranges (or the maximum discard size) is reached
from the plug merging code. I/O scheduler merging is not wired up yet
but might also be useful, although not for fast devices like NVMe which
are the only user for now.
Note that for now we don't support limiting the size of each discard range,
but if needed that can be added later.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/elevator.h')
| -rw-r--r-- | include/linux/elevator.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index b38b4e651ea6..8265b6330cc2 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -16,6 +16,7 @@ enum elv_merge { ELEVATOR_NO_MERGE = 0, ELEVATOR_FRONT_MERGE = 1, ELEVATOR_BACK_MERGE = 2, + ELEVATOR_DISCARD_MERGE = 3, }; typedef enum elv_merge (elevator_merge_fn) (struct request_queue *, struct request **, |