hw/block-common: Factor out fall back to legacy -drive cyls=...

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

1 files changed, 40 insertions, 0 deletions

diff --git a/hw/block-common.c b/hw/block-common.c
index 0a0542a650..f0196d78dc 100644
--- a/hw/block-common.c
+++ b/hw/block-common.c
@@ -9,6 +9,7 @@
 
 #include "blockdev.h"
 #include "hw/block-common.h"
+#include "qemu-error.h"
 
 void blkconf_serial(BlockConf *conf, char **serial)
 {
@@ -22,3 +23,42 @@ void blkconf_serial(BlockConf *conf, char **serial)
         }
     }
 }
+
+int blkconf_geometry(BlockConf *conf, int *ptrans,
+                     unsigned cyls_max, unsigned heads_max, unsigned secs_max)
+{
+    DriveInfo *dinfo;
+
+    if (!conf->cyls && !conf->heads && !conf->secs) {
+        /* try to fall back to value set with legacy -drive cyls=... */
+        dinfo = drive_get_by_blockdev(conf->bs);
+        conf->cyls  = dinfo->cyls;
+        conf->heads = dinfo->heads;
+        conf->secs  = dinfo->secs;
+        if (ptrans) {
+            *ptrans = dinfo->trans;
+        }
+    }
+    if (!conf->cyls && !conf->heads && !conf->secs) {
+        hd_geometry_guess(conf->bs,
+                          &conf->cyls, &conf->heads, &conf->secs,
+                          ptrans);
+    } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
+        *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
+    }
+    if (conf->cyls || conf->heads || conf->secs) {
+        if (conf->cyls < 1 || conf->cyls > cyls_max) {
+            error_report("cyls must be between 1 and %u", cyls_max);
+            return -1;
+        }
+        if (conf->heads < 1 || conf->heads > heads_max) {
+            error_report("heads must be between 1 and %u", heads_max);
+            return -1;
+        }
+        if (conf->secs < 1 || conf->secs > secs_max) {
+            error_report("secs must be between 1 and %u", secs_max);
+            return -1;
+        }
+    }
+    return 0;
+}