audit: Simplify locking around untag_chunk()

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untag_chunk() has to be called with hash_lock, it drops it and
reacquires it when returning. The unlocking of hash_lock is thus hidden
from the callers of untag_chunk() with is rather error prone. Reorganize
the code so that untag_chunk() is called without hash_lock, only with
mark reference preventing the chunk from going away.

Since this requires some more code in the caller of untag_chunk() to
assure forward progress, factor out loop pruning tree from all chunks
into a common helper function.

Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

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Jan Kara 2018-11-12 09:54:56 -05:00 • committed by Paul Moore

parent c22fcde775

commit 8432c70062

1 changed files with 40 additions and 37 deletions

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kernel/audit_tree.c

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