ovl: hash non-indexed dir by upper inode for NFS export

Non-indexed upper dirs are encoded as upper file handles. When NFS export
is enabled, hash non-indexed directory inodes by upper inode, so we can
find them in inode cache using the decoded upper inode.

When NFS export is disabled, directories are not indexed on copy up, so
hash non-indexed directory inodes by origin inode, the same hash key
that is used before copy up.

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 56ba015b9f5e0d70cbbc600bba6186ba9e2b651f..416dc06835db4312f1d0263e648858a97ce2a130 100644 (file)
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -665,6 +665,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
                            struct dentry *lowerdentry, struct dentry *index,
                            unsigned int numlower)
 {
+       struct ovl_fs *ofs = sb->s_fs_info;
        struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
        struct inode *inode;
        /* Already indexed or could be indexed on copy up? */
@@ -684,9 +685,10 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
         * Hash non-dir that is or could be indexed by origin inode.
         * Hash dir that is or could be merged by origin inode.
         * Hash pure upper and non-indexed non-dir by upper inode.
+        * Hash non-indexed dir by upper inode for NFS export.
         */
        is_dir = S_ISDIR(realinode->i_mode);
-       if (is_dir)
+       if (is_dir && (indexed || !sb->s_export_op || !ofs->upper_mnt))
                origin = lowerdentry;
 
        if (upperdentry || origin) {