From bca585d24a1719d9314d5438b0d2804a33d9bbb6 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 5 Jan 2021 14:13:52 -0500 Subject: new helper: d_find_alias_rcu() similar to d_find_alias(inode), except that * the caller must be holding rcu_read_lock() * inode must not be freed until matching rcu_read_unlock() * result is *NOT* pinned and can only be dereferenced until the matching rcu_read_unlock(). Signed-off-by: Al Viro --- fs/dcache.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'fs/dcache.c') diff --git a/fs/dcache.c b/fs/dcache.c index 97e81a844a96..843546633457 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1042,6 +1042,31 @@ struct dentry *d_find_alias(struct inode *inode) } EXPORT_SYMBOL(d_find_alias); +/* + * Caller MUST be holding rcu_read_lock() and be guaranteed + * that inode won't get freed until rcu_read_unlock(). + */ +struct dentry *d_find_alias_rcu(struct inode *inode) +{ + struct hlist_head *l = &inode->i_dentry; + struct dentry *de = NULL; + + spin_lock(&inode->i_lock); + // ->i_dentry and ->i_rcu are colocated, but the latter won't be + // used without having I_FREEING set, which means no aliases left + if (likely(!(inode->i_state & I_FREEING) && !hlist_empty(l))) { + if (S_ISDIR(inode->i_mode)) { + de = hlist_entry(l->first, struct dentry, d_u.d_alias); + } else { + hlist_for_each_entry(de, l, d_u.d_alias) + if (!d_unhashed(de)) + break; + } + } + spin_unlock(&inode->i_lock); + return de; +} + /* * Try to kill dentries associated with this inode. * WARNING: you must own a reference to inode. -- cgit v1.2.3