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nfsd: add some comments to nfsd_file_do_acquire 

David Howells mentioned that he found this bit of code confusing, so
sprinkle in some comments to clarify.

Reported-by: David Howells <dhowells@redhat.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Jeff Layton 2023-01-05 07:15:12 -05:00 committed by Chuck Lever
parent c6593366c0
commit b680cb9b73
1 changed files with 5 additions and 0 deletions
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5
fs/nfsd/filecache.c
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@ -1094,6 +1094,11 @@ retry:
rcu_read_unlock(); rcu_read_unlock();
if (nf) { if (nf) {
/*
* If the nf is on the LRU then it holds an extra reference
* that must be put if it's removed. It had better not be
* the last one however, since we should hold another.
*/
if (nfsd_file_lru_remove(nf)) if (nfsd_file_lru_remove(nf))
WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref)); WARN_ON_ONCE(refcount_dec_and_test(&nf->nf_ref));
goto wait_for_construction; goto wait_for_construction;