fs: dcache scale d_unhashed

Protect d_unhashed(dentry) condition with d_lock. This means keeping
DCACHE_UNHASHED bit in synch with hash manipulations.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index 895532ac4d98..35e5f5a9ef59 100644
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -174,13 +174,16 @@ struct dentry *ocfs2_find_local_alias(struct inode *inode,
         list_for_each(p, &inode->i_dentry) {
                 dentry = list_entry(p, struct dentry, d_alias);
 
+                spin_lock(&dentry->d_lock);
                 if (ocfs2_match_dentry(dentry, parent_blkno, skip_unhashed)) {
                         mlog(0, "dentry found: %.*s\n",
                              dentry->d_name.len, dentry->d_name.name);
 
-                        dget_locked(dentry);
+                        dget_locked_dlock(dentry);
+                        spin_unlock(&dentry->d_lock);
                         break;
                 }
+                spin_unlock(&dentry->d_lock);
 
                 dentry = NULL;
         }