diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/dcache.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 97e81a844a96..843546633457 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1043,6 +1043,31 @@ 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. */ |