# register bcache devices as they come up
# man 7 udev for syntax

SUBSYSTEM!="block", GOTO="bcache_end"
ACTION=="remove", GOTO="bcache_end"
ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}=="1", GOTO="bcache_end"
KERNEL=="fd*|sr*", GOTO="bcache_end"

# blkid was run by the standard udev rules
# It recognised bcache (util-linux 2.24+)
ENV{ID_FS_TYPE}=="bcache", GOTO="bcache_backing_found"
# It recognised something else; bail
ENV{ID_FS_TYPE}=="?*", GOTO="bcache_backing_end"

# Backing devices: scan, symlink, register
IMPORT{program}="probe-bcache -o udev $tempnode"
ENV{ID_FS_TYPE}!="bcache", GOTO="bcache_backing_end"
#The logic to prevent an existing symlink being overwritten by a
#device having duplicate uuid once we got the uuid we are locking it out ,like Raid devices, raw disks,
#LVM volumes. Hence same logic exists in the corresponding rule files.
ENV{ID_FS_UUID_ENC}=="?*", PROGRAM=="/bin/sh -c '/usr/bin/findmnt UUID=$env{ID_FS_UUID_ENC} -o SOURCE --noheadings | /usr/bin/grep -E \"^$env{DEVNAME}$|^$env{DEVNAME}\[\"'", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}", GOTO="uuid_end"
ENV{ID_FS_UUID_ENC}=="?*", PROGRAM!="/usr/bin/findmnt UUID=$env{ID_FS_UUID_ENC}", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_ENC}"

LABEL="uuid_end"
LABEL="bcache_backing_found"
RUN{builtin}+="kmod load bcache"
RUN+="bcache-register $tempnode"
LABEL="bcache_backing_end"

# Cached devices: symlink
DRIVER=="bcache", ENV{CACHED_UUID}=="?*", \
        SYMLINK+="bcache/by-uuid/$env{CACHED_UUID}"
DRIVER=="bcache", ENV{CACHED_LABEL}=="?*", \
        SYMLINK+="bcache/by-label/$env{CACHED_LABEL}"

LABEL="bcache_end"