x86: fix sysupgrades on disks with 4k block size

Even when the disk uses 4k blocks, the partition table still uses units
of 512 byte sectors. Always use ibs=512 for the offsets

Signed-off-by: Felix Fietkau <nbd@nbd.name>

diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh
index 8850917062618985126b5086dccfe11506ed1fbb..d3e9f360aadedad0995da55205364940c9884ba4 100644 (file)
--- a/target/linux/x86/base-files/lib/upgrade/platform.sh
+++ b/target/linux/x86/base-files/lib/upgrade/platform.sh
@@ -21,20 +21,13 @@ platform_copy_config() {
 }
 
 platform_do_upgrade() {
-       local diskdev partdev ibs diff
+       local diskdev partdev diff
 
        if export_bootdevice && export_partdevice diskdev 0; then
                sync
                if [ "$SAVE_PARTITIONS" = "1" ]; then
                        get_partitions "/dev/$diskdev" bootdisk
 
-                       #get block size
-                       if [ -f "/sys/block/$diskdev/queue/physical_block_size" ]; then
-                               ibs="$(cat "/sys/block/$diskdev/queue/physical_block_size")"
-                       else
-                               ibs=512
-                       fi
-
                        #extract the boot sector from the image
                        get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
 
@@ -54,7 +47,7 @@ platform_do_upgrade() {
                        while read part start size; do
                                if export_partdevice partdev $part; then
                                        echo "Writing image to /dev/$partdev..."
-                                       get_image "$@" | dd of="/dev/$partdev" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync
+                                       get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
                                else
                                        echo "Unable to find partition $part device, skipped."
                                fi