[PATCH v6 1/5] dcache: export d_find_alias_rcu() for modular filesystems

[Alex Markuze]

CephFS subvolume quarantine needs a dentry alias for its RCU ancestry
walk without acquiring a dentry reference. d_find_alias_rcu() provides
that lookup, but is unavailable to a modular Ceph client.

Export d_find_alias_rcu() to GPL modules. The Ceph quarantine state
handling patch uses the export with the helper's RCU lifetime rules.

Signed-off-by: Alex Markuze <amarkuze@xxxxxxxxxx>
---
 fs/dcache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/dcache.c b/fs/dcache.c
index 1b1a81f10da67c608704383086c3facb64ee3b3b..13ba553081b33a54fd8d1cac5cbc55d0149e4ad7 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1248,6 +1248,7 @@ struct dentry *d_find_alias_rcu(struct inode *inode)
 	spin_unlock(&inode->i_lock);
 	return de;
 }
+EXPORT_SYMBOL_GPL(d_find_alias_rcu);
 
 /*
  *	Try to kill dentries associated with this inode.