Files
scoutfs/kmod
Auke Kok c8bc42ccdb Fix quota invalidate race with concurrent ruleset read
A quota check holds the quota cluster lock for READ and marks the
cached ruleset EBUSY while loading rules.  A quota mod on the same
mount holds the lock for WRITE (compatible with the local READ)
and calls scoutfs_quota_invalidate(), tripping
BUG_ON(rs == ERR_PTR(-EBUSY)).

Make invalidate skip EBUSY so the reader's claim is preserved, and
have scoutfs_quota_mod_rule wait for the reader to finish before
calling invalidate.  Without the wait, the in-flight reader would
publish its stale ruleset after invalidate runs, leaving the cache
stale until the next invalidation.

Signed-off-by: Auke Kok <auke.kok@versity.com>
2026-05-02 13:19:31 -07:00
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