LU-4712 llite: lock the inode to be migrated

Because the inode and its connected dentries will be cleared
out of the cache after migration, the inode needs to be locked
during the migration.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: Ibbbb33473de1a67df85ef8930debcf22cd775bcb
Reviewed-on: http://review.whamcloud.com/9689
Tested-by: Jenkins
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/llite/file.c b/lustre/llite/file.c
index 230a41f..0ee0dde 100644 (file)
--- a/lustre/llite/file.c
+++ b/lustre/llite/file.c
@@ -3030,11 +3030,14 @@ int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
        qstr.name = name;
        qstr.len = namelen;
        dchild = d_lookup(file->f_dentry, &qstr);
-       if (dchild != NULL && dchild->d_inode != NULL) {
-               op_data->op_fid3 = *ll_inode2fid(dchild->d_inode);
+       if (dchild != NULL) {
                if (dchild->d_inode != NULL) {
                        child_inode = igrab(dchild->d_inode);
-                       ll_invalidate_aliases(child_inode);
+                       if (child_inode != NULL) {
+                               mutex_lock(&child_inode->i_mutex);
+                               op_data->op_fid3 = *ll_inode2fid(child_inode);
+                               ll_invalidate_aliases(child_inode);
+                       }
                }
                dput(dchild);
        } else {
@@ -3075,6 +3078,7 @@ int ll_migrate(struct inode *parent, struct file *file, int mdtidx,
 out_free:
        if (child_inode != NULL) {
                clear_nlink(child_inode);
+               mutex_unlock(&child_inode->i_mutex);
                iput(child_inode);
        }