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H A Dquota_tree.cdiff a898cb621ac589b0b9e959309689a027e765aa12 Wed Feb 07 19:12:15 CET 2024 Jan Kara <jack@suse.cz> quota: Detect loops in quota tree

Syzbot has found that when it creates corrupted quota files where the
quota tree contains a loop, we will deadlock when tryling to insert a
dquot. Add loop detection into functions traversing the quota tree.

Signed-off-by: Jan Kara <jack@suse.cz>