[20/20] block: Remove bdrv_(set_)enable_write_cache()

Commit Message

Kevin Wolf March 18, 2016, 6:21 p.m. UTC

The only remaining users were block jobs (mirror and backup) which
unconditionally enabled WCE on the BlockBackend of the target image. As
these block jobs don't go through BlockBackend for their I/O requests,
they aren't affected by this setting anyway but always get a writeback
mode, so that call can be removed.

Signed-off-by: Kevin Wolf <[e-mail]>
---
 block.c               | 16 ----------------
 block/backup.c        |  1 -
 block/mirror.c        |  1 -
 include/block/block.h |  2 --
 4 files changed, 20 deletions(-)

Comments

Max Reitz March 26, 2016, 9:25 p.m. UTC | #1

On 18.03.2016 19:21, Kevin Wolf wrote:
> The only remaining users were block jobs (mirror and backup) which
> unconditionally enabled WCE on the BlockBackend of the target image. As
> these block jobs don't go through BlockBackend for their I/O requests,
> they aren't affected by this setting anyway but always get a writeback
> mode, so that call can be removed.
> 
> Signed-off-by: Kevin Wolf <[e-mail]>
> ---
>  block.c               | 16 ----------------
>  block/backup.c        |  1 -
>  block/mirror.c        |  1 -
>  include/block/block.h |  2 --
>  4 files changed, 20 deletions(-)

Reviewed-by: Max Reitz <[e-mail]>

Patch

diff --git a/block.c b/block.c
index 0e7cbb6..c22cb3f 100644
--- a/block.c
+++ b/block.c
@@ -2695,22 +2695,6 @@  int bdrv_is_sg(BlockDriverState *bs)
     return bs->sg;
 }
 
-int bdrv_enable_write_cache(BlockDriverState *bs)
-{
-    if (bs->blk) {
-        return blk_enable_write_cache(bs->blk);
-    } else {
-        return true;
-    }
-}
-
-void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce)
-{
-    if (bs->blk) {
-        blk_set_enable_write_cache(bs->blk, wce);
-    }
-}
-
 int bdrv_is_encrypted(BlockDriverState *bs)
 {
     if (bs->backing && bs->backing->bs->encrypted) {
diff --git a/block/backup.c b/block/backup.c
index ab3e345..10397e2 100644
--- a/block/backup.c
+++ b/block/backup.c
@@ -402,7 +402,6 @@  static void coroutine_fn backup_run(void *opaque)
 
     job->done_bitmap = bitmap_new(end);
 
-    bdrv_set_enable_write_cache(target, true);
     if (target->blk) {
         blk_set_on_error(target->blk, on_target_error, on_target_error);
         blk_iostatus_enable(target->blk);
diff --git a/block/mirror.c b/block/mirror.c
index 9635fa8..da18c0b 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -855,7 +855,6 @@  static void mirror_start_job(BlockDriverState *bs, BlockDriverState *target,
 
     bdrv_op_block_all(s->target, s->common.blocker);
 
-    bdrv_set_enable_write_cache(s->target, true);
     if (s->target->blk) {
         blk_set_on_error(s->target->blk, on_target_error, on_target_error);
         blk_iostatus_enable(s->target->blk);
diff --git a/include/block/block.h b/include/block/block.h
index bd596b1..3eb281a 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -393,8 +393,6 @@  int bdrv_is_allocated_above(BlockDriverState *top, BlockDriverState *base,
 
 int bdrv_is_read_only(BlockDriverState *bs);
 int bdrv_is_sg(BlockDriverState *bs);
-int bdrv_enable_write_cache(BlockDriverState *bs);
-void bdrv_set_enable_write_cache(BlockDriverState *bs, bool wce);
 bool bdrv_is_inserted(BlockDriverState *bs);
 int bdrv_media_changed(BlockDriverState *bs);
 void bdrv_lock_medium(BlockDriverState *bs, bool locked);