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| author | Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> | 2020-12-16 09:16:57 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2021-01-26 14:36:37 +0100 |
| commit | 897dd0ec4fdea4e6fa7674729750d05acc1bf41e (patch) | |
| tree | f374693f0fa8f3d446c9952b41954f7c73db2ae2 /include | |
| parent | b6e0985a4c48eb4f5ed115759bc816322942f39c (diff) | |
| download | focaccia-qemu-897dd0ec4fdea4e6fa7674729750d05acc1bf41e.tar.gz focaccia-qemu-897dd0ec4fdea4e6fa7674729750d05acc1bf41e.zip | |
block: include supported_read_flags into BDS structure
Add the new member supported_read_flags to the BlockDriverState structure. It will control the flags set for copy-on-read operations. Make the block generic layer evaluate supported read flags before they go to a block driver. Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> [vsementsov: use assert instead of abort] Reviewed-by: Max Reitz <mreitz@redhat.com> Message-Id: <20201216061703.70908-8-vsementsov@virtuozzo.com> Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/block_int.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/block/block_int.h b/include/block/block_int.h index f3d0a0e60a..92d3754ead 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -881,6 +881,10 @@ struct BlockDriverState { /* I/O Limits */ BlockLimits bl; + /* + * Flags honored during pread + */ + unsigned int supported_read_flags; /* Flags honored during pwrite (so far: BDRV_REQ_FUA, * BDRV_REQ_WRITE_UNCHANGED). * If a driver does not support BDRV_REQ_WRITE_UNCHANGED, those |