[Qemu-devel] [PATCH 13/41] hd-geometry: Cut out block layer translation middleman

[Kevin Wolf <kwolf@redhat.com>]

From: Markus Armbruster <armbru@redhat.com>

hd_geometry_guess() picks geometry and translation.  Callers can get
the geometry directly, via parameters, but for translation they need
to go through the block layer.

Add a parameter for translation, so it can optionally be gotten just
like geometry.  In preparation of purging translation from the block
layer, which will happen later in this series.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/block-common.h |    3 ++-
 hw/hd-geometry.c  |   20 ++++++++++++++------
 hw/ide/core.c     |    2 +-
 hw/scsi-disk.c    |    4 ++--
 hw/virtio-blk.c   |    2 +-
 5 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/hw/block-common.h b/hw/block-common.h
index 3a4d4c6..bba817a 100644
--- a/hw/block-common.h
+++ b/hw/block-common.h
@@ -16,6 +16,7 @@
 /* Hard disk geometry */
 
 void hd_geometry_guess(BlockDriverState *bs,
-                       int *pcyls, int *pheads, int *psecs);
+                       int *pcyls, int *pheads, int *psecs,
+                       int *ptrans);
 
 #endif
diff --git a/hw/hd-geometry.c b/hw/hd-geometry.c
index 241aed9..4d746b7 100644
--- a/hw/hd-geometry.c
+++ b/hw/hd-geometry.c
@@ -117,7 +117,8 @@ static void guess_chs_for_size(BlockDriverState *bs,
 }
 
 void hd_geometry_guess(BlockDriverState *bs,
-                       int *pcyls, int *pheads, int *psecs)
+                       int *pcyls, int *pheads, int *psecs,
+                       int *ptrans)
 {
     int cylinders, heads, secs, translation;
 
@@ -129,6 +130,9 @@ void hd_geometry_guess(BlockDriverState *bs,
         *pcyls = cylinders;
         *pheads = heads;
         *psecs = secs;
+        if (ptrans) {
+            *ptrans = translation;
+        }
         return;
     }
 
@@ -142,10 +146,10 @@ void hd_geometry_guess(BlockDriverState *bs,
            translation was active, so a standard physical disk
            geometry is OK */
         guess_chs_for_size(bs, pcyls, pheads, psecs);
-        bdrv_set_translation_hint(bs,
-                                  *pcyls * *pheads <= 131072
-                                  ? BIOS_ATA_TRANSLATION_LARGE
-                                  : BIOS_ATA_TRANSLATION_LBA);
+        translation = *pcyls * *pheads <= 131072
+            ? BIOS_ATA_TRANSLATION_LARGE
+            : BIOS_ATA_TRANSLATION_LBA;
+        bdrv_set_translation_hint(bs, translation);
     } else {
         /* LCHS guess with heads <= 16: use as physical geometry */
         *pcyls = cylinders;
@@ -153,7 +157,11 @@ void hd_geometry_guess(BlockDriverState *bs,
         *psecs = secs;
         /* disable any translation to be in sync with
            the logical geometry */
-        bdrv_set_translation_hint(bs, BIOS_ATA_TRANSLATION_NONE);
+        translation = BIOS_ATA_TRANSLATION_NONE;
+        bdrv_set_translation_hint(bs, translation);
+    }
+    if (ptrans) {
+        *ptrans = translation;
     }
     bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
     trace_hd_geometry_guess(bs, *pcyls, *pheads, *psecs, translation);
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 0d1bf10..28f04ad 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -1934,7 +1934,7 @@ int ide_init_drive(IDEState *s, BlockDriverState *bs, IDEDriveKind kind,
     s->drive_kind = kind;
 
     bdrv_get_geometry(bs, &nb_sectors);
-    hd_geometry_guess(bs, &cylinders, &heads, &secs);
+    hd_geometry_guess(bs, &cylinders, &heads, &secs, NULL);
     if (cylinders < 1 || cylinders > 16383) {
         error_report("cyls must be between 1 and 16383");
         return -1;
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 5339c2e..fc077f5 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -990,7 +990,7 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
             break;
         }
         /* if a geometry hint is available, use it */
-        hd_geometry_guess(bdrv, &cylinders, &heads, &secs);
+        hd_geometry_guess(bdrv, &cylinders, &heads, &secs, NULL);
         p[2] = (cylinders >> 16) & 0xff;
         p[3] = (cylinders >> 8) & 0xff;
         p[4] = cylinders & 0xff;
@@ -1024,7 +1024,7 @@ static int mode_sense_page(SCSIDiskState *s, int page, uint8_t **p_outbuf,
         p[2] = 5000 >> 8;
         p[3] = 5000 & 0xff;
         /* if a geometry hint is available, use it */
-        hd_geometry_guess(bdrv, &cylinders, &heads, &secs);
+        hd_geometry_guess(bdrv, &cylinders, &heads, &secs, NULL);
         p[4] = heads & 0xff;
         p[5] = secs & 0xff;
         p[6] = s->qdev.blocksize >> 8;
diff --git a/hw/virtio-blk.c b/hw/virtio-blk.c
index f16c5ce..d2709a7 100644
--- a/hw/virtio-blk.c
+++ b/hw/virtio-blk.c
@@ -623,7 +623,7 @@ VirtIODevice *virtio_blk_init(DeviceState *dev, VirtIOBlkConf *blk)
     s->blk = blk;
     s->rq = NULL;
     s->sector_mask = (s->conf->logical_block_size / BDRV_SECTOR_SIZE) - 1;
-    hd_geometry_guess(s->bs, &cylinders, &heads, &secs);
+    hd_geometry_guess(s->bs, &cylinders, &heads, &secs, NULL);
 
     s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
 
-- 
1.7.6.5