diff options
| author | Christoph Hellwig <hch@lst.de> | 2009-09-04 19:01:15 +0200 |
|---|---|---|
| committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-09-11 10:19:46 -0500 |
| commit | e900a7b748316b5b5a98e41dde36a0cb8e15be5f (patch) | |
| tree | f41d52f388664258f5caa4a03645cb4409676065 /block/cow.c | |
| parent | b8193adbda922659ba290fd9fb6ee053ee191d70 (diff) | |
block: add enable_write_cache flag
Add a enable_write_cache flag in the block driver state, and use it to
decide if we claim to have a volatile write cache that needs controlled
flushing from the guest. The flag is off if cache=writethrough is
defined because O_DSYNC guarantees that every write goes to stable
storage, and it is on for cache=none and cache=writeback.
Both scsi-disk and ide now use the new flage, changing from their
defaults of always off (ide) or always on (scsi-disk).
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'block/cow.c')
0 files changed, 0 insertions, 0 deletions