fb36ce40d6
This apparently causes deadlocks when many xenstore-write (one for each block device) called at the same time.
62 lines
1.5 KiB
Bash
Executable File
62 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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NAME=${DEVNAME#/dev/}
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DESC="${ID_MODEL} (${ID_FS_LABEL})"
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SIZE=$[ $(cat /sys/$DEVPATH/size) * 512 ]
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MODE=w
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XS_KEY="qubes-block-devices/$NAME"
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xs_remove() {
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if [ "$QUBES_EXPOSED" == "1" ]; then
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xenstore-rm "$XS_KEY"
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fi
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echo QUBES_EXPOSED=0
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}
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# Ignore mounted...
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if fgrep -q $DEVNAME /proc/mounts; then
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xs_remove
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exit 0
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fi
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# ... and used by device-mapper
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if [ -n "`ls -A /sys/$DEVPATH/holders 2> /dev/null`" ]; then
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xs_remove
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exit 0
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fi
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# ... and "empty" loop devices
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if [ "$MAJOR" -eq 7 -a ! -d /sys/$DEVPATH/loop ]; then
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xs_remove
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exit 0
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fi
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# Special case for CD
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if [ "$ID_TYPE" = "cd" ]; then
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if [ "$ID_CDROM_MEDIA" != "1" ]; then
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# Hide empty cdrom drive
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xs_remove
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exit 0
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fi
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MODE=r
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fi
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# Special description for loop devices
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if [ -d /sys/$DEVPATH/loop ]; then
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DESC=$(cat /sys/$DEVPATH/loop/backing_file)
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fi
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# Get lock only in dom0 - there are so many block devices so it causes xenstore
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# deadlocks sometimes.
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if [ -f /etc/qubes-release ]; then
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# Skip xenstore-write if cannot obtain lock. This can mean very early system startup
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# stage without /run mounted (or populated). Devices will be rediscovered later
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# by qubes-core startup script.
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exec 9>>/var/run/qubes/block-xenstore.lock || exit 0
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flock 9
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fi
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xenstore-write "$XS_KEY/desc" "$DESC" "$XS_KEY/size" "$SIZE" "$XS_KEY/mode" "$MODE"
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echo QUBES_EXPOSED=1
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# Make sure that block backend is loaded
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/sbin/modprobe xen-blkback 2> /dev/null || /sbin/modprobe blkbk
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