nfs: store devname at disconnected NFS roots

[cascardo/linux.git] / fs / nfs / getroot.c

diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
index 4d6e5a3..1084792 100644 (file)
--- a/fs/nfs/getroot.c
+++ b/fs/nfs/getroot.c
@@ -82,12 +82,18 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
        struct nfs_fsinfo fsinfo;
        struct dentry *ret;
        struct inode *inode;
+       void *name = kstrdup(devname, GFP_KERNEL);
        int error;
 
+       if (!name)
+               return ERR_PTR(-ENOMEM);
+
        /* get the actual root for this mount */
        fsinfo.fattr = nfs_alloc_fattr();
-       if (fsinfo.fattr == NULL)
+       if (fsinfo.fattr == NULL) {
+               kfree(name);
                return ERR_PTR(-ENOMEM);
+       }
 
        error = server->nfs_client->rpc_ops->getroot(server, mntfh, &fsinfo);
        if (error < 0) {
@@ -120,7 +126,15 @@ struct dentry *nfs_get_root(struct super_block *sb, struct nfs_fh *mntfh,
        }
 
        security_d_instantiate(ret, inode);
+       spin_lock(&ret->d_lock);
+       if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
+               ret->d_fsdata = name;
+               name = NULL;
+       }
+       spin_unlock(&ret->d_lock);
 out:
+       if (name)
+               kfree(name);
        nfs_free_fattr(fsinfo.fattr);
        return ret;
 }
@@ -177,21 +191,28 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh,
        struct nfs_fattr *fattr = NULL;
        struct dentry *ret;
        struct inode *inode;
+       void *name = kstrdup(devname, GFP_KERNEL);
        int error;
 
        dprintk("--> nfs4_get_root()\n");
 
+       if (!name)
+               return ERR_PTR(-ENOMEM);
+
        /* get the info about the server and filesystem */
        error = nfs4_server_capabilities(server, mntfh);
        if (error < 0) {
                dprintk("nfs_get_root: getcaps error = %d\n",
                        -error);
+               kfree(name);
                return ERR_PTR(error);
        }
 
        fattr = nfs_alloc_fattr();
-       if (fattr == NULL)
-               return ERR_PTR(-ENOMEM);;
+       if (fattr == NULL) {
+               kfree(name);
+               return ERR_PTR(-ENOMEM);
+       }
 
        /* get the actual root for this mount */
        error = server->nfs_client->rpc_ops->getattr(server, mntfh, fattr);
@@ -225,8 +246,15 @@ struct dentry *nfs4_get_root(struct super_block *sb, struct nfs_fh *mntfh,
        }
 
        security_d_instantiate(ret, inode);
-
+       spin_lock(&ret->d_lock);
+       if (IS_ROOT(ret) && !(ret->d_flags & DCACHE_NFSFS_RENAMED)) {
+               ret->d_fsdata = name;
+               name = NULL;
+       }
+       spin_unlock(&ret->d_lock);
 out:
+       if (name)
+               kfree(name);
        nfs_free_fattr(fattr);
        dprintk("<-- nfs4_get_root()\n");
        return ret;