From 3d1922335f63c10b50527f210c05e039a51f69de Mon Sep 17 00:00:00 2001

From: George McCollister <george.mccollister@gmail.com>

Date: Thu, 25 May 2017 21:13:50 -0500

Subject: [PATCH] rules: Handle MMC boot partitions by-path correctly (#6026)

Many eMMC devices have separate boot partitions that aren't part of the

normal partition table that show up as /dev/mmcblk[0-9]boot[0-9]. These

partitions are generally small (128KB to 16MB) and typically hold a boot

loader, boot loader data or a recovery image. Match these and create

-boot%n by-path symlinks.

Prior to this change by-path symlinks for the main device would be

incorrectly linked to one of the boot partitions.

For instance before:

/dev/disk/by-path/platform-219c000.usdhc linked to /dev/mmcblk1boot1

Now:

/dev/disk/by-path/platform-219c000.usdhc links to /dev/mmcblk1

/dev/disk/by-path/platform-219c000.usdhc-boot0 links to /dev/mmcblk1boot0

/dev/disk/by-path/platform-219c000.usdhc-boot1 links to /dev/mmcblk1boot1

On systems that support multiple SD/MMC devices it can be essential to

have by-path links to these devices since device names vary depending on

which other devices are connected.

(cherry picked from commit 4e3f07029ad7b86773ce85db422bbce95ac578cf)

---

 rules/60-persistent-storage.rules | 3 ++-

 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/rules/60-persistent-storage.rules b/rules/60-persistent-storage.rules

index 9817e9c64b..d2745f65f4 100644

--- a/rules/60-persistent-storage.rules

+++ b/rules/60-persistent-storage.rules

@@ -64,7 +64,8 @@ KERNEL=="msblk[0-9]p[0-9]|mspblk[0-9]p[0-9]", ENV{ID_NAME}=="?*", ENV{ID_SERIAL}

 # by-path

 ENV{DEVTYPE}=="disk", DEVPATH!="*/virtual/*", IMPORT{builtin}="path_id"

-ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}"

+KERNEL=="mmcblk[0-9]boot[0-9]", ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-boot%n"

+KERNEL!="mmcblk[0-9]boot[0-9]", ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}"

 ENV{DEVTYPE}=="partition", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"

 # legacy virtio-pci by-path links (deprecated)