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https://github.com/morgan9e/systemd
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2103067f25
Virtual block devices are a bit weird: they have no parent device, and thus cannot be related to the subsystem they belong to, except by pattern matching their name. This is OK to do if one knows what to look for. However for tools that do not want to carry a list of known subsystems with their appropriate matching patters this sucks. Let's introduce a new ID_BLOCK_SUBSYSTEM property we can set on block devices that carries an explicit string for this. Do so for a small number of key subsystems: DM, loopback and zram.
25 lines
1.4 KiB
Plaintext
25 lines
1.4 KiB
Plaintext
# do not edit this file, it will be overwritten on update
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# enable in-kernel media-presence polling
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ACTION=="add", SUBSYSTEM=="module", KERNEL=="block", ATTR{parameters/events_dfl_poll_msecs}=="0", \
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ATTR{parameters/events_dfl_poll_msecs}="2000"
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# forward scsi device event to corresponding block device
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ACTION=="change", SUBSYSTEM=="scsi", ENV{DEVTYPE}=="scsi_device", TEST=="block", ATTR{block/*/uevent}="change"
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# watch metadata changes, caused by tools closing the device node which was opened for writing
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ACTION!="remove", SUBSYSTEM=="block", \
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KERNEL=="loop*|mmcblk*[0-9]|msblk*[0-9]|mspblk*[0-9]|nvme*|sd*|vd*|xvd*|bcache*|cciss*|dasd*|ubd*|ubi*|scm*|pmem*|nbd*|zd*|rbd*|zram*|ublkb*", \
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OPTIONS+="watch"
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# Reset access rights to each loopback device once it gets detached.
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ACTION=="change", SUBSYSTEM=="block", KERNEL=="loop*", ENV{DISK_MEDIA_CHANGE}=="1", TEST!="loop/backing_file", GROUP="disk", MODE="660"
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# Provide a somewhat cleaned up field indicating the subsystem various
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# 'virtual' block devices belong too, in order to avoid replicating name based
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# pattern matching in every consumer
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ACTION!="remove", SUBSYSTEM=="block", KERNEL=="dm-*", ENV{ID_BLOCK_SUBSYSTEM}="dm"
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ACTION!="remove", SUBSYSTEM=="block", KERNEL=="loop*", ENV{ID_BLOCK_SUBSYSTEM}="loop"
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ACTION!="remove", SUBSYSTEM=="block", KERNEL=="md*", ENV{ID_BLOCK_SUBSYSTEM}="md"
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ACTION!="remove", SUBSYSTEM=="block", KERNEL=="zram*", ENV{ID_BLOCK_SUBSYSTEM}="zram"
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