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udev: add a brief comment about the origin of the filters

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I am not sure whether the original discussions are correct or not.
This is just for adding references for future verification for the
filters.
This commit is contained in:
Yu Watanabe 2022-04-06 20:18:51 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 8dc3c2f197
commit a9e832092a
1 changed files with 6 additions and 0 deletions
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6
src/udev/udevd.c
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@ -442,6 +442,12 @@ static int device_get_whole_disk(sd_device *dev, sd_device **ret_device, const c
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get sysname: %m");
/* Exclude the following devices:
* For "dm-", see the comment added by e918a1b5a94f270186dca59156354acd2a596494.
* For "md", see the commit message of 2e5b17d01347d3c3118be2b8ad63d20415dbb1f0,
* but not sure the assumption is still valid even when partitions are created on the md
* devices, surprisingly which seems to be possible, see PR #22973.
* For "drbd", see the commit message of fee854ee8ccde0cd28e0f925dea18cce35f3993d. */
if (STARTSWITH_SET(val, "dm-", "md", "drbd"))
goto irrelevant;