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rules: Handle MMC boot partitions by-path correctly (#6026)

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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.
This commit is contained in:
George McCollister 2017-05-25 21:13:50 -05:00 committed by Zbigniew Jędrzejewski-Szmek
parent 2340bfbfcc
commit 4e3f07029a
1 changed files with 2 additions and 1 deletions
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3
rules/60-persistent-storage.rules
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@ -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)