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dcache: add missing lockdep annotation

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lock_parent() very much on purpose does nested locking of dentries, and
is careful to maintain the right order (lock parent first).  But because
it didn't annotate the nested locking order, lockdep thought it might be
a deadlock on d_lock, and complained.

Add the proper annotation for the inner locking of the child dentry to
make lockdep happy.

Introduced by commit 046b961b45 ("shrink_dentry_list(): take parent's
->d_lock earlier").

Reported-and-tested-by: Josh Boyer <jwboyer@fedoraproject.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2014-05-31 09:13:21 -07:00
parent 1487385edb
commit 9f12600fe4
1 changed files with 1 additions and 1 deletions
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2
fs/dcache.c
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@ -553,7 +553,7 @@ again:
}
rcu_read_unlock();
if (parent != dentry)
spin_lock(&dentry->d_lock);
spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
else
parent = NULL;
return parent;