Revert "[PATCH] RPC,NFS: new rpc_pipefs patch"

This reverts 17f4e6febca160a9f9dd4bdece9784577a2f4524 commit.

6 files changed, 209 insertions, 142 deletions

diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 1d0a5bf0d264..ffb8df91dc34 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -66,6 +66,7 @@ struct idmap_hashtable {
 };
 
 struct idmap {
+        char                  idmap_path[48];
         struct dentry        *idmap_dentry;
         wait_queue_head_t     idmap_wq;
         struct idmap_msg      idmap_im;
@@ -101,8 +102,11 @@ nfs_idmap_new(struct nfs4_client *clp)
 
         memset(idmap, 0, sizeof(*idmap));
 
-        idmap->idmap_dentry = rpc_mkpipe(clp->cl_rpcclient->cl_dentry,
-                        "idmap", idmap, &idmap_upcall_ops, 0);
+        snprintf(idmap->idmap_path, sizeof(idmap->idmap_path),
+            "%s/idmap", clp->cl_rpcclient->cl_pathname);
+
+        idmap->idmap_dentry = rpc_mkpipe(idmap->idmap_path,
+            idmap, &idmap_upcall_ops, 0);
         if (IS_ERR(idmap->idmap_dentry)) {
                 kfree(idmap);
                 return;
@@ -124,7 +128,7 @@ nfs_idmap_delete(struct nfs4_client *clp)
 
         if (!idmap)
                 return;
-        rpc_unlink(idmap->idmap_dentry);
+        rpc_unlink(idmap->idmap_path);
         clp->cl_idmap = NULL;
         kfree(idmap);
 }
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index b5b51c196690..ab151bbb66df 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -59,7 +59,7 @@ struct rpc_clnt {
 
         int                     cl_nodelen;     /* nodename length */
         char                    cl_nodename[UNX_MAXNODENAME];
-        struct dentry *         __cl_parent_dentry;
+        char                    cl_pathname[30];/* Path in rpc_pipe_fs */
         struct dentry *         cl_dentry;      /* inode */
         struct rpc_clnt *       cl_parent;      /* Points to parent of clones */
         struct rpc_rtt          cl_rtt_default;
diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index 63878d05c9a9..63929349571f 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -41,11 +41,10 @@ RPC_I(struct inode *inode)
 
 extern int rpc_queue_upcall(struct inode *, struct rpc_pipe_msg *);
 
-extern struct dentry *rpc_mkdir(struct dentry *, char *, struct rpc_clnt *);
-extern void rpc_rmdir(struct dentry *);
-extern struct dentry *rpc_mkpipe(struct dentry *, char *, void *,
-                struct rpc_pipe_ops *, int flags);
-extern void rpc_unlink(struct dentry *);
+extern struct dentry *rpc_mkdir(char *, struct rpc_clnt *);
+extern int rpc_rmdir(char *);
+extern struct dentry *rpc_mkpipe(char *, void *, struct rpc_pipe_ops *, int flags);
+extern int rpc_unlink(char *);
 
 #endif
 #endif
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index bd2555139fa9..d2b08f16c257 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -87,6 +87,7 @@ struct gss_auth {
         struct list_head upcalls;
         struct rpc_clnt *client;
         struct dentry *dentry;
+        char path[48];
         spinlock_t lock;
 };
 
@@ -689,8 +690,10 @@ gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor)
         if (err)
                 goto err_put_mech;
 
-        gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name,
-                        clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
+        snprintf(gss_auth->path, sizeof(gss_auth->path), "%s/%s",
+                        clnt->cl_pathname,
+                        gss_auth->mech->gm_name);
+        gss_auth->dentry = rpc_mkpipe(gss_auth->path, clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN);
         if (IS_ERR(gss_auth->dentry)) {
                 err = PTR_ERR(gss_auth->dentry);
                 goto err_put_mech;
@@ -715,7 +718,7 @@ gss_destroy(struct rpc_auth *auth)
                 auth, auth->au_flavor);
 
         gss_auth = container_of(auth, struct gss_auth, rpc_auth);
-        rpc_unlink(gss_auth->dentry);
+        rpc_unlink(gss_auth->path);
         gss_mech_put(gss_auth->mech);
 
         rpcauth_free_credcache(auth);
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 63bf591310e0..5a8f01d726e9 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -67,42 +67,26 @@ static u32 *	call_verify(struct rpc_task *task);
 static int
 rpc_setup_pipedir(struct rpc_clnt *clnt, char *dir_name)
 {
-        static unsigned int clntid;
-        char name[128];
+        static uint32_t clntid;
         int error;
 
         if (dir_name == NULL)
                 return 0;
-
- retry_parent:
-        clnt->__cl_parent_dentry = rpc_mkdir(NULL, dir_name, NULL);
-        if (IS_ERR(clnt->__cl_parent_dentry)) {
-                error = PTR_ERR(clnt->__cl_parent_dentry);
-                if (error == -EEXIST)
-                        goto retry_parent; /* XXX(hch): WTF? */
-        
-                printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
-                                dir_name, error);
-                return error;
-        }
-
-
- retry_child:
-        snprintf(name, sizeof(name), "clnt%x", clntid++);
-        name[sizeof(name) - 1] = '\0';
-
-        clnt->cl_dentry = rpc_mkdir(clnt->__cl_parent_dentry, name, clnt);
-        if (IS_ERR(clnt->cl_dentry)) {
+        for (;;) {
+                snprintf(clnt->cl_pathname, sizeof(clnt->cl_pathname),
+                                "%s/clnt%x", dir_name,
+                                (unsigned int)clntid++);
+                clnt->cl_pathname[sizeof(clnt->cl_pathname) - 1] = '\0';
+                clnt->cl_dentry = rpc_mkdir(clnt->cl_pathname, clnt);
+                if (!IS_ERR(clnt->cl_dentry))
+                        return 0;
                 error = PTR_ERR(clnt->cl_dentry);
-                if (error == -EEXIST)
-                        goto retry_child;
-                printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
-                                name, error);
-                rpc_rmdir(clnt->__cl_parent_dentry);
-                return error;
+                if (error != -EEXIST) {
+                        printk(KERN_INFO "RPC: Couldn't create pipefs entry %s, error %d\n",
+                                        clnt->cl_pathname, error);
+                        return error;
+                }
         }
-
-        return 0;
 }
 
 /*
@@ -190,8 +174,7 @@ rpc_new_client(struct rpc_xprt *xprt, char *servname,
         return clnt;
 
 out_no_auth:
-        rpc_rmdir(clnt->cl_dentry);
-        rpc_rmdir(clnt->__cl_parent_dentry);
+        rpc_rmdir(clnt->cl_pathname);
 out_no_path:
         if (clnt->cl_server != clnt->cl_inline_name)
                 kfree(clnt->cl_server);
@@ -319,10 +302,8 @@ rpc_destroy_client(struct rpc_clnt *clnt)
                 rpc_destroy_client(clnt->cl_parent);
                 goto out_free;
         }
-        if (clnt->cl_dentry)
-                rpc_rmdir(clnt->cl_dentry);
-        if (clnt->__cl_parent_dentry)
-                rpc_rmdir(clnt->__cl_parent_dentry);
+        if (clnt->cl_pathname[0])
+                rpc_rmdir(clnt->cl_pathname);
         if (clnt->cl_xprt) {
                 xprt_destroy(clnt->cl_xprt);
                 clnt->cl_xprt = NULL;
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index b382809726d8..ded6c63f11ec 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -414,6 +414,38 @@ rpc_put_mount(void)
         simple_release_fs(&rpc_mount, &rpc_mount_count);
 }
 
+static int
+rpc_lookup_parent(char *path, struct nameidata *nd)
+{
+        if (path[0] == '\0')
+                return -ENOENT;
+        if (rpc_get_mount()) {
+                printk(KERN_WARNING "%s: %s failed to mount "
+                               "pseudofilesystem \n", __FILE__, __FUNCTION__);
+                return -ENODEV;
+        }
+        nd->mnt = mntget(rpc_mount);
+        nd->dentry = dget(rpc_mount->mnt_root);
+        nd->last_type = LAST_ROOT;
+        nd->flags = LOOKUP_PARENT;
+        nd->depth = 0;
+
+        if (path_walk(path, nd)) {
+                printk(KERN_WARNING "%s: %s failed to find path %s\n",
+                                __FILE__, __FUNCTION__, path);
+                rpc_put_mount();
+                return -ENOENT;
+        }
+        return 0;
+}
+
+static void
+rpc_release_path(struct nameidata *nd)
+{
+        path_release(nd);
+        rpc_put_mount();
+}
+
 static struct inode *
 rpc_get_inode(struct super_block *sb, int mode)
 {
@@ -518,149 +550,197 @@ out_bad:
         return -ENOMEM;
 }
 
-struct dentry *
-rpc_mkdir(struct dentry *parent, char *name, struct rpc_clnt *rpc_client)
+static int
+__rpc_mkdir(struct inode *dir, struct dentry *dentry)
 {
-        struct inode *dir;
-        struct dentry *dentry;
         struct inode *inode;
+
+        inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
+        if (!inode)
+                goto out_err;
+        inode->i_ino = iunique(dir->i_sb, 100);
+        d_instantiate(dentry, inode);
+        dir->i_nlink++;
+        inode_dir_notify(dir, DN_CREATE);
+        rpc_get_mount();
+        return 0;
+out_err:
+        printk(KERN_WARNING "%s: %s failed to allocate inode for dentry %s\n",
+                        __FILE__, __FUNCTION__, dentry->d_name.name);
+        return -ENOMEM;
+}
+
+static int
+__rpc_rmdir(struct inode *dir, struct dentry *dentry)
+{
         int error;
 
-        if (!parent)
-                parent = rpc_mount->mnt_root;
+        shrink_dcache_parent(dentry);
+        if (dentry->d_inode) {
+                rpc_close_pipes(dentry->d_inode);
+                rpc_inode_setowner(dentry->d_inode, NULL);
+        }
+        if ((error = simple_rmdir(dir, dentry)) != 0)
+                return error;
+        if (!error) {
+                inode_dir_notify(dir, DN_DELETE);
+                d_drop(dentry);
+                rpc_put_mount();
+        }
+        return 0;
+}
 
-        dir = parent->d_inode;
-        
-        error = rpc_get_mount();
-        if (error)
-                return ERR_PTR(error);
+static struct dentry *
+rpc_lookup_negative(char *path, struct nameidata *nd)
+{
+        struct dentry *dentry;
+        struct inode *dir;
+        int error;
 
+        if ((error = rpc_lookup_parent(path, nd)) != 0)
+                return ERR_PTR(error);
+        dir = nd->dentry->d_inode;
         down(&dir->i_sem);
-        dentry = lookup_one_len(name, parent, strlen(name));
+        dentry = lookup_hash(&nd->last, nd->dentry);
         if (IS_ERR(dentry))
-                goto out_unlock;
+                goto out_err;
         if (dentry->d_inode) {
+                dput(dentry);
                 dentry = ERR_PTR(-EEXIST);
-                goto out_dput;
+                goto out_err;
         }
-
-        inode = rpc_get_inode(dir->i_sb, S_IFDIR | S_IRUSR | S_IXUSR);
-        if (!inode)
-                goto out_dput;
-        inode->i_ino = iunique(dir->i_sb, 100);
-        dir->i_nlink++;
-        RPC_I(dentry->d_inode)->private = rpc_client;
-
-        d_instantiate(dentry, inode);
-        dget(dentry);
+        return dentry;
+out_err:
         up(&dir->i_sem);
+        rpc_release_path(nd);
+        return dentry;
+}
 
-        inode_dir_notify(dir, DN_CREATE);
 
+struct dentry *
+rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
+{
+        struct nameidata nd;
+        struct dentry *dentry;
+        struct inode *dir;
+        int error;
+
+        dentry = rpc_lookup_negative(path, &nd);
+        if (IS_ERR(dentry))
+                return dentry;
+        dir = nd.dentry->d_inode;
+        if ((error = __rpc_mkdir(dir, dentry)) != 0)
+                goto err_dput;
+        RPC_I(dentry->d_inode)->private = rpc_client;
         error = rpc_populate(dentry, authfiles,
                         RPCAUTH_info, RPCAUTH_EOF);
         if (error)
-                goto out_depopulate;
-
-        return dentry;
-
- out_depopulate:
-        rpc_rmdir(dentry);
- out_dput:
-        dput(dentry);
- out_unlock:
+                goto err_depopulate;
+out:
         up(&dir->i_sem);
-        rpc_put_mount();
+        rpc_release_path(&nd);
         return dentry;
+err_depopulate:
+        rpc_depopulate(dentry);
+        __rpc_rmdir(dir, dentry);
+err_dput:
+        dput(dentry);
+        printk(KERN_WARNING "%s: %s() failed to create directory %s (errno = %d)\n",
+                        __FILE__, __FUNCTION__, path, error);
+        dentry = ERR_PTR(error);
+        goto out;
 }
 
-void
-rpc_rmdir(struct dentry *dentry)
+int
+rpc_rmdir(char *path)
 {
-        struct dentry *parent = dentry->d_parent;
-
-        rpc_depopulate(dentry);
+        struct nameidata nd;
+        struct dentry *dentry;
+        struct inode *dir;
+        int error;
 
-        down(&parent->d_inode->i_sem);
-        if (dentry->d_inode) {
-                rpc_close_pipes(dentry->d_inode);
-                rpc_inode_setowner(dentry->d_inode, NULL);
-                simple_rmdir(parent->d_inode, dentry);
+        if ((error = rpc_lookup_parent(path, &nd)) != 0)
+                return error;
+        dir = nd.dentry->d_inode;
+        down(&dir->i_sem);
+        dentry = lookup_hash(&nd.last, nd.dentry);
+        if (IS_ERR(dentry)) {
+                error = PTR_ERR(dentry);
+                goto out_release;
         }
-        up(&parent->d_inode->i_sem);
-
-        inode_dir_notify(parent->d_inode, DN_DELETE);
-        rpc_put_mount();
+        rpc_depopulate(dentry);
+        error = __rpc_rmdir(dir, dentry);
+        dput(dentry);
+out_release:
+        up(&dir->i_sem);
+        rpc_release_path(&nd);
+        return error;
 }
 
 struct dentry *
-rpc_mkpipe(struct dentry *parent, char *name, void *private,
-           struct rpc_pipe_ops *ops, int flags)
+rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags)
 {
-        struct inode *dir = parent->d_inode;
+        struct nameidata nd;
         struct dentry *dentry;
-        struct inode *inode;
+        struct inode *dir, *inode;
         struct rpc_inode *rpci;
-        int error;
-
-        error = rpc_get_mount();
-        if (error)
-                return ERR_PTR(error);
 
-        down(&parent->d_inode->i_sem);
-        dentry = lookup_one_len(name, parent, strlen(name));
+        dentry = rpc_lookup_negative(path, &nd);
         if (IS_ERR(dentry))
-                goto out_unlock;
-        if (dentry->d_inode) {
-                dentry = ERR_PTR(-EEXIST);
-                goto out_dput;
-        }
-
-        inode = rpc_get_inode(parent->d_inode->i_sb,
-                        S_IFSOCK | S_IRUSR | S_IWUSR);
-        if (!inode) {
-                dentry = ERR_PTR(-ENOMEM);
-                goto out_dput;
-        }
-
+                return dentry;
+        dir = nd.dentry->d_inode;
+        inode = rpc_get_inode(dir->i_sb, S_IFSOCK | S_IRUSR | S_IWUSR);
+        if (!inode)
+                goto err_dput;
         inode->i_ino = iunique(dir->i_sb, 100);
         inode->i_fop = &rpc_pipe_fops;
-
+        d_instantiate(dentry, inode);
         rpci = RPC_I(inode);
         rpci->private = private;
         rpci->flags = flags;
         rpci->ops = ops;
-
-        d_instantiate(dentry, inode);
-        dget(dentry);
-        up(&parent->d_inode->i_sem);
-
         inode_dir_notify(dir, DN_CREATE);
+out:
+        up(&dir->i_sem);
+        rpc_release_path(&nd);
         return dentry;
-
- out_dput:
+err_dput:
         dput(dentry);
- out_unlock:
-        up(&parent->d_inode->i_sem);
-        rpc_put_mount();
-        return dentry;
+        dentry = ERR_PTR(-ENOMEM);
+        printk(KERN_WARNING "%s: %s() failed to create pipe %s (errno = %d)\n",
+                        __FILE__, __FUNCTION__, path, -ENOMEM);
+        goto out;
 }
 
-void
-rpc_unlink(struct dentry *dentry)
+int
+rpc_unlink(char *path)
 {
-        struct dentry *parent = dentry->d_parent;
+        struct nameidata nd;
+        struct dentry *dentry;
+        struct inode *dir;
+        int error;
 
-        down(&parent->d_inode->i_sem);
+        if ((error = rpc_lookup_parent(path, &nd)) != 0)
+                return error;
+        dir = nd.dentry->d_inode;
+        down(&dir->i_sem);
+        dentry = lookup_hash(&nd.last, nd.dentry);
+        if (IS_ERR(dentry)) {
+                error = PTR_ERR(dentry);
+                goto out_release;
+        }
+        d_drop(dentry);
         if (dentry->d_inode) {
                 rpc_close_pipes(dentry->d_inode);
                 rpc_inode_setowner(dentry->d_inode, NULL);
-                simple_unlink(parent->d_inode, dentry);
+                error = simple_unlink(dir, dentry);
         }
-        up(&parent->d_inode->i_sem);
-
-        inode_dir_notify(parent->d_inode, DN_DELETE);
-        rpc_put_mount();
+        dput(dentry);
+        inode_dir_notify(dir, DN_DELETE);
+out_release:
+        up(&dir->i_sem);
+        rpc_release_path(&nd);
+        return error;
 }
 
 /*