core: 为腾讯云设置 max_sectors_kb

fixes #500

debian.cfg

@@ -339,6 +339,19 @@ d-i partman/early_command string true; \
         debconf-set base-installer/kernel/image "$(debconf-get base-installer/kernel/image | sed 's/-cloud//')"; \
     fi; \
 
+    if [ "$(cat /sys/devices/virtual/dmi/id/sys_vendor 2>/dev/null)" = 'Tencent Cloud' ]; then \
+        for block in /sys/class/block/vd[a-z]; do \
+            if [ -d "$block" ]; then \
+                echo 512 >"$block/queue/max_sectors_kb"; \
+            fi; \
+        done; \
+        echo 'KERNEL=="vd*[a-z]", ACTION=="add|change", SUBSYSTEM=="block", RUN+="/bin/sh -c '\''/bin/echo 512 > /sys/%p/queue/max_sectors_kb'\''"' >/etc/udev/rules.d/80-max-sectors-blk.rules; \
+        udevadm control --reload; \
+        udevadm trigger --subsystem-match=block; \
+        udevadm settle; \
+        sleep 1; \
+    fi; \
+
     if [ -d /sys/firmware/efi ]; then \
         debconf-set partman-auto/expert_recipe "$(debconf-get partman-auto/expert_recipe_efi)"; \
     else \
@@ -433,4 +446,9 @@ d-i preseed/late_command string true; \
 
     cp /fix-eth-name.sh /target/; \
     cp /fix-eth-name.service /target/etc/systemd/system/; \
-    in-target systemctl enable fix-eth-name
+    in-target systemctl enable fix-eth-name; \
+
+    if [ "$(cat /sys/devices/virtual/dmi/id/sys_vendor 2>/dev/null)" = 'Tencent Cloud' ]; then \
+        echo 'KERNEL=="vd*[a-z]", ACTION=="add|change", SUBSYSTEM=="block", RUN+="/bin/sh -c '\''/bin/echo 512 > /sys/%p/queue/max_sectors_kb'\''"' >/target/etc/udev/rules.d/80-max-sectors-blk.rules; \
+        in-target update-initramfs -u -k all; \
+    fi