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5dd424b9f6
The standard udev rules create a `/dev/disk/by-uuid/` link using the FS's global UUID. This is good. It means the FS UUID can be used to wait for *any* device that's a member of the FS. But, for a multi-device file system, users are advised to add the options `x-systemd.wants=/dev/disk/by-id/xyz` using some ID that's unique to each specific disk. This way systemd knows to wait for each member. If any of them times out, the use of `wants` rather than `requires` allows for a degraded mount to be attempted, if the user has configured the `degraded` option. This adds a per-member UUID link in `/dev/disk/by-uuid/` to use for this purpose.
25 lines
989 B
Plaintext
25 lines
989 B
Plaintext
# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# Copyright (C) 2024 Oracle. All rights reserved.
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# Author: Darrick J. Wong <djwong@kernel.org>
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SUBSYSTEM!="block", GOTO="bcachefs_end"
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ACTION=="remove", GOTO="bcachefs_end"
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ENV{ID_FS_TYPE}!="bcachefs", GOTO="bcachefs_end"
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ENV{SYSTEMD_READY}=="0", GOTO="bcachefs_end"
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# udev has already assigned a by-uuid link using the FS global
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# UUID. We should also have a link for the per-member UUID.
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ENV{ID_FS_UUID_SUB_ENC}=="?*", SYMLINK+="disk/by-uuid/$env{ID_FS_UUID_SUB_ENC}"
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# Don't let udisks automount bcachefs filesystems without even asking a user.
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# This doesn't eliminate filesystems as an attack surface; it only prevents
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# evil maid attacks when all sessions are locked.
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#
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# According to http://storaged.org/doc/udisks2-api/latest/udisks.8.html,
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# supplying UDISKS_AUTO=0 here changes the HintAuto property of the block
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# device abstraction to mean "do not automatically start" (e.g. mount).
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ENV{UDISKS_AUTO}="0"
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LABEL="bcachefs_end"
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