Eric Traut a708fc6839
Handle Btrfs device mismatches when masking daemon sockets ( #47968 ) ...
## Why
Btrfs subvolumes can report an `st_dev` that differs from the device in `/proc/self/mountinfo`, causing daemon socket mount validation to reject valid mounts.
## What changed
Allow the mismatch only when the opened directory and its uniquely identified mount are both verified as Btrfs. Discover socket directory aliases using both device identities while retaining checks that reject unsafe directory and socket bind mounts.
## Testing
Add regression tests for aliases under both device numbers, unverified or inconsistent filesystems, unavailable or missing mount IDs, duplicate mount IDs, and unsafe bind mounts.
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Eric Traut
a708fc6839