[Qemu-devel] [PATCH v3 07/29] hd-geometry: Unnest conditional in hd_geometry_guess()

[Markus Armbruster]

Signed-off-by: Markus Armbruster <address@hidden>
---
 hw/hd-geometry.c |   84 +++++++++++++++++++++++++++---------------------------
 1 files changed, 42 insertions(+), 42 deletions(-)

diff --git a/hw/hd-geometry.c b/hw/hd-geometry.c
index f0dd021..db47846 100644
--- a/hw/hd-geometry.c
+++ b/hw/hd-geometry.c
@@ -104,58 +104,58 @@ void hd_geometry_guess(BlockDriverState *bs,
     int cylinders, heads, secs;
     uint64_t nb_sectors;
 
-    /* if a geometry hint is available, use it */
     bdrv_get_geometry(bs, &nb_sectors);
     bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs);
     translation = bdrv_get_translation_hint(bs);
+
     if (cylinders != 0) {
+        /* already got a geometry hint: use it */
         *pcyls = cylinders;
         *pheads = heads;
         *psecs = secs;
-    } else {
-        if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) {
-            if (heads > 16) {
-                /* if heads > 16, it means that a BIOS LBA
-                   translation was active, so the default
-                   hardware geometry is OK */
-                lba_detected = 1;
-                goto default_geometry;
-            } else {
-                *pcyls = cylinders;
-                *pheads = heads;
-                *psecs = secs;
-                /* disable any translation to be in sync with
-                   the logical geometry */
-                if (translation == BIOS_ATA_TRANSLATION_AUTO) {
-                    bdrv_set_translation_hint(bs,
-                                              BIOS_ATA_TRANSLATION_NONE);
-                }
-            }
-        } else {
-        default_geometry:
-            /* if no geometry, use a standard physical disk geometry */
-            cylinders = nb_sectors / (16 * 63);
+        return;
+    }
 
-            if (cylinders > 16383) {
-                cylinders = 16383;
-            } else if (cylinders < 2) {
-                cylinders = 2;
-            }
-            *pcyls = cylinders;
-            *pheads = 16;
-            *psecs = 63;
-            if ((lba_detected == 1)
-                && (translation == BIOS_ATA_TRANSLATION_AUTO)) {
-                if ((*pcyls * *pheads) <= 131072) {
-                    bdrv_set_translation_hint(bs,
-                                              BIOS_ATA_TRANSLATION_LARGE);
-                } else {
-                    bdrv_set_translation_hint(bs,
-                                              BIOS_ATA_TRANSLATION_LBA);
-                }
+    if (guess_disk_lchs(bs, &cylinders, &heads, &secs) < 0) {
+        /* no LCHS guess: use a standard physical disk geometry  */
+    default_geometry:
+        cylinders = nb_sectors / (16 * 63);
+
+        if (cylinders > 16383) {
+            cylinders = 16383;
+        } else if (cylinders < 2) {
+            cylinders = 2;
+        }
+        *pcyls = cylinders;
+        *pheads = 16;
+        *psecs = 63;
+        if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) 
{
+            if ((*pcyls * *pheads) <= 131072) {
+                bdrv_set_translation_hint(bs,
+                                          BIOS_ATA_TRANSLATION_LARGE);
+            } else {
+                bdrv_set_translation_hint(bs,
+                                          BIOS_ATA_TRANSLATION_LBA);
             }
         }
-        bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
+    } else if (heads > 16) {
+        /* LCHS guess with heads > 16 means that a BIOS LBA
+           translation was active, so a standard physical disk
+           geometry is OK */
+        lba_detected = 1;
+        goto default_geometry;
+    } else {
+        /* LCHS guess with heads <= 16: use as physical geometry */
+        *pcyls = cylinders;
+        *pheads = heads;
+        *psecs = secs;
+        /* disable any translation to be in sync with
+           the logical geometry */
+        if (translation == BIOS_ATA_TRANSLATION_AUTO) {
+            bdrv_set_translation_hint(bs,
+                                      BIOS_ATA_TRANSLATION_NONE);
+        }
     }
+    bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs);
     trace_hd_geometry_guess(bs, *pcyls, *pheads, *psecs, translation);
 }
-- 
1.7.6.5