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>
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 3ecf915..571f270 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -136,6 +136,7 @@
fi->at_end = 1;
goto out_unlock;
}
+ spin_lock(&dentry->d_lock);
if (!d_unhashed(dentry) && dentry->d_inode &&
ceph_snap(dentry->d_inode) != CEPH_SNAPDIR &&
ceph_ino(dentry->d_inode) != CEPH_INO_CEPH &&
@@ -145,13 +146,13 @@
dentry->d_name.len, dentry->d_name.name, di->offset,
filp->f_pos, d_unhashed(dentry) ? " unhashed" : "",
!dentry->d_inode ? " null" : "");
+ spin_unlock(&dentry->d_lock);
p = p->prev;
dentry = list_entry(p, struct dentry, d_u.d_child);
di = ceph_dentry(dentry);
}
- spin_lock(&dentry->d_lock);
- dentry->d_count++;
+ dget_dlock(dentry);
spin_unlock(&dentry->d_lock);
spin_unlock(&dcache_lock);