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(parent: f39b177) | patch
dm cache: promotion optimisation for writes
authorJoe Thornber <ejt@redhat.com>
Thu, 31 Oct 2013 17:55:48 +0000 (13:55 -0400)
committerMike Snitzer <snitzer@redhat.com>
Sat, 9 Nov 2013 23:20:26 +0000 (18:20 -0500)
commit93ebc97866f4108aa2efb3c26c6da5920045b086
tree480183ffb8ce716748a319df07820f23477e3be7tree | snapshot
parentf39b177dd3cb8941eef36f5dce15a6cd6eb0e349commit | diff
dm cache: promotion optimisation for writes

If a write block triggers promotion and covers a whole block we can
avoid a copy.

Introduce dm_{hook,unhook}_bio to simplify saving and restoring bio
fields (bi_private is now used by overwrite).  Switch writethrough
support over to using these helpers too.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
drivers/md/dm-cache-target.c diff | blob | history
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