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| author | Jens Axboe <axboe@fb.com> | 2014-06-24 16:22:24 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2014-06-24 16:22:24 -0600 |
| commit | 66cb45aa41315d1d9972cada354fbdf7870d7714 (patch) | |
| tree | 5ca5ef3c31f24a7a11989d8a6a163eed9aaf9528 /include/linux/blkdev.h | |
| parent | 3a4b0eda8e4b27e6aca86f9f4d327c1070815e30 (diff) | |
| download | lwn-66cb45aa41315d1d9972cada354fbdf7870d7714.tar.gz lwn-66cb45aa41315d1d9972cada354fbdf7870d7714.zip | |
block: add support for limiting gaps in SG lists
Another restriction inherited for NVMe - those devices don't support
SG lists that have "gaps" in them. Gaps refers to cases where the
previous SG entry doesn't end on a page boundary. For NVMe, all SG
entries must start at offset 0 (except the first) and end on a page
boundary (except the last).
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 713f8b62b435..8699bcf5f099 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -512,6 +512,7 @@ struct request_queue { #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ +#define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_STACKABLE) | \ |