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//lib/udev/bcache-export-cached

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#!/bin/sh
#
# This program reads the bcache superblock on bcacheX slaves to extract the
# dev.uuid and dev.label which refer to a specific backing device.
#
# It integrates with udev 'import' by writing CACHED_UUID=X and optionally
# CACHED_LABEL=X for the backing device of the provided bcache device.
# Ignore caching devices by skipping unless sb.version=1
#
# There is 1 and only 1 backing device (slaves/*) for a bcache device.

TEMPNODE=${1}               # /dev/bcacheN
DEVNAME=${TEMPNODE##*/}     # /dev/bcacheN -> bcacheN

for slave in "/sys/class/block/$DEVNAME/slaves"/*; do
    [ -d "$slave" ] || continue
    /usr/sbin/bcache-super-show "/dev/${slave##*/}" |
       awk '$1 == "sb.version" { sbver=$2; }
            $1 == "dev.uuid" { uuid=$2; }
            $1 == "dev.label" && $2 != "(empty)" { label=$2; }
            END {
                if (sbver == 1 && uuid) {
                    print("CACHED_UUID=" uuid)
                    if (label) print("CACHED_LABEL=" label)
                    exit(0)
                }
                exit(1);
            }'
    # awk exits 0 if it found a backing device.
    [ $? -eq 0 ] && exit 0
done

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Name	Size	Perms	Modified	Actions
hwdb.d DIR	-	drwxr-xr-x	2026-01-08 12:55:11	Edit Download recursive recursive
rules.d DIR	-	drwxr-xr-x	2026-02-07 06:05:16	Edit Download recursive recursive
ata_id	82.72 KB	lrwxr-xr-x	2025-11-25 18:16:31	Edit Download recursive recursive
bcache-export-cached	1.13 KB	lrwxr-xr-x	2024-04-08 15:54:26	Edit Download recursive recursive
bcache-register	14.30 KB	lrwxr-xr-x	2024-04-08 15:54:26	Edit Download recursive recursive
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probe-bcache	14.30 KB	lrwxr-xr-x	2024-04-08 15:54:26	Edit Download recursive recursive
scsi_id	87.23 KB	lrwxr-xr-x	2025-11-25 18:16:31	Edit Download recursive recursive
snappy-app-dev	18.23 KB	lrwxr-xr-x	2025-11-21 07:08:02	Edit Download recursive recursive
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