Linux 3.10+ exposes RPMB (Replay Protected Memory Block) partitions of MMC
devices [1] ; trying to read them with blkid or other unspecific means will
cause kernel buffer I/O errors and timeouts. So don't run blkid on these.
Also ensure that /dev/disk/by-path creates proper symlinks and exposes the
-rpmb partition separately, instead of letting the "normal" partition symlink
point to the rpbm device (this is a race condition).
[1] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=
090d25fe224c0
https://launchpad.net/bugs/
1333140
# by-path (parent device path)
ENV{DEVTYPE}=="disk", DEVPATH!="*/virtual/*", IMPORT{builtin}="path_id"
# by-path (parent device path)
ENV{DEVTYPE}=="disk", DEVPATH!="*/virtual/*", IMPORT{builtin}="path_id"
-ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}"
+ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", KERNEL=="mmcblk[0-9]*rpmb", SYMLINK+="disk/by-path/$env{ID_PATH}-rpmb"
+ENV{DEVTYPE}=="disk", ENV{ID_PATH}=="?*", KERNEL!="mmcblk[0-9]*rpmb", SYMLINK+="disk/by-path/$env{ID_PATH}"
ENV{DEVTYPE}=="partition", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"
# skip unpartitioned removable media devices from drivers which do not send "change" events
ENV{DEVTYPE}=="partition", ENV{ID_PATH}=="?*", SYMLINK+="disk/by-path/$env{ID_PATH}-part%n"
# skip unpartitioned removable media devices from drivers which do not send "change" events
KERNEL=="sr*", ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*", ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="", \
IMPORT{builtin}="blkid --noraid"
KERNEL=="sr*", ENV{DISK_EJECT_REQUEST}!="?*", ENV{ID_CDROM_MEDIA_TRACK_COUNT_DATA}=="?*", ENV{ID_CDROM_MEDIA_SESSION_LAST_OFFSET}=="", \
IMPORT{builtin}="blkid --noraid"
+# don't try to read Replay Protected Memory Block partitions
+KERNEL=="mmcblk[0-9]*rpmb", GOTO="persistent_storage_end"
+
# probe filesystem metadata of disks
KERNEL!="sr*", IMPORT{builtin}="blkid"
# probe filesystem metadata of disks
KERNEL!="sr*", IMPORT{builtin}="blkid"