ovl: decode lower file handles of unlinked but open files
Lookup overlay inode in cache by origin inode, so we can decode a file
handle of an open file even if the index has a whiteout index entry to
mark this overlay inode was unlinked.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index bfd7c76..56ba015 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -645,6 +645,22 @@ static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
return true;
}
+struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *origin)
+{
+ struct inode *inode, *key = d_inode(origin);
+
+ inode = ilookup5(sb, (unsigned long) key, ovl_inode_test, key);
+ if (!inode)
+ return NULL;
+
+ if (!ovl_verify_inode(inode, origin, NULL)) {
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+
+ return inode;
+}
+
struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
struct dentry *lowerdentry, struct dentry *index,
unsigned int numlower)