| commit | a604fa2ba55f645abbb082469ed595f58f657ac8 | |
| author | Eric Blake <eblake@redhat.com> | |
| Thu, 23 Jun 2016 22:37:06 +0000 (23 16:37 -0600) | ||
| committer | Kevin Wolf <kwolf@redhat.com> | |
| Tue, 5 Jul 2016 14:46:24 +0000 (5 16:46 +0200) | ||
| tree | 78b51a354097ea4fe70f8af15e84b873ed5e09bb | treesnapshot (tar.gz zip) |
| parent | cff86b38aca34c9cc5c6f8846cc1c5b3d181c376 | commitdiff |
block: Document supported flags during bdrv_aligned_preadv()
We don't pass any flags on to drivers to handle. Tighten an
assert to explain why we pass 0 to bdrv_driver_preadv(), and add
some comments on things to be aware of if we want to turn on
per-BDS BDRV_REQ_FUA support during reads in the future. Also,
document that we may want to consider using unmap during
copy-on-read operations where the read is all zeroes.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
We don't pass any flags on to drivers to handle. Tighten an
assert to explain why we pass 0 to bdrv_driver_preadv(), and add
some comments on things to be aware of if we want to turn on
per-BDS BDRV_REQ_FUA support during reads in the future. Also,
document that we may want to consider using unmap during
copy-on-read operations where the read is all zeroes.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| block/io.c | diffblobblamehistory |