block: Geometry and translation hints are now useless, purge them

There are two producers of these hints: drive_init() on behalf of
-drive, and hd_geometry_guess().

The only consumer of the hint is hd_geometry_guess().

The callers of hd_geometry_guess() call it only when drive_init()
didn't set the hints.  Therefore, drive_init()'s hints are never used.

Thus, hd_geometry_guess() only ever sees hints it produced itself in a
prior call.  Only the first call computes something, subsequent calls
just repeat the first call's results.  However, hd_geometry_guess() is
never called more than once: the device models don't, and the block
device is destroyed on unplug.  Thus, dropping the repeat feature
doesn't break anything now.

If a block device wasn't destroyed on unplug and could be reused with
a new device, then repeating old results would be wrong.  Thus,
dropping the repeat feature prevents future breakage.

This renders the hints unused.  Purge them from the block layer.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 0 insertions, 32 deletions

diff --git a/block.c b/block.c
index 06323cfe53..ce7eb8f79b 100644
--- a/block.c
+++ b/block.c
@@ -996,12 +996,6 @@ static void bdrv_move_feature_fields(BlockDriverState *bs_dest,
     bs_dest->block_timer        = bs_src->block_timer;
     bs_dest->io_limits_enabled  = bs_src->io_limits_enabled;
 
-    /* geometry */
-    bs_dest->cyls               = bs_src->cyls;
-    bs_dest->heads              = bs_src->heads;
-    bs_dest->secs               = bs_src->secs;
-    bs_dest->translation        = bs_src->translation;
-
     /* r/w error */
     bs_dest->on_read_error      = bs_src->on_read_error;
     bs_dest->on_write_error     = bs_src->on_write_error;
@@ -2132,27 +2126,6 @@ void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
     *nb_sectors_ptr = length;
 }
 
-void bdrv_set_geometry_hint(BlockDriverState *bs,
-                            int cyls, int heads, int secs)
-{
-    bs->cyls = cyls;
-    bs->heads = heads;
-    bs->secs = secs;
-}
-
-void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
-{
-    bs->translation = translation;
-}
-
-void bdrv_get_geometry_hint(BlockDriverState *bs,
-                            int *pcyls, int *pheads, int *psecs)
-{
-    *pcyls = bs->cyls;
-    *pheads = bs->heads;
-    *psecs = bs->secs;
-}
-
 /* throttling disk io limits */
 void bdrv_set_io_limits(BlockDriverState *bs,
                         BlockIOLimit *io_limits)
@@ -2161,11 +2134,6 @@ void bdrv_set_io_limits(BlockDriverState *bs,
     bs->io_limits_enabled = bdrv_io_limits_enabled(bs);
 }
 
-int bdrv_get_translation_hint(BlockDriverState *bs)
-{
-    return bs->translation;
-}
-
 void bdrv_set_on_error(BlockDriverState *bs, BlockErrorAction on_read_error,
                        BlockErrorAction on_write_error)
 {