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From: Scott Mayhew <smayhew@redhat.com>
To: anna.schumaker@netapp.com, trond.myklebust@hammerspace.com
Cc: dhowells@redhat.com, viro@zeniv.linux.org.uk,
	linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 07/26] nfs: lift setting mount_info from nfs_xdev_mount()
Date: Fri, 13 Sep 2019 08:17:29 -0400
Message-ID: <20190913121748.25391-8-smayhew@redhat.com> (raw)
In-Reply-To: <20190913121748.25391-1-smayhew@redhat.com>

From: Al Viro <viro@zeniv.linux.org.uk>

Do it in nfs_do_submount() instead.  As a side benefit, nfs_clone_data
doesn't need ->fh and ->fattr anymore.

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
 fs/nfs/internal.h  |  3 +--
 fs/nfs/namespace.c | 35 +++++++++++++++++++++--------------
 fs/nfs/super.c     | 25 ++++---------------------
 3 files changed, 26 insertions(+), 37 deletions(-)

diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index c132e683e1c9..eeb54b45875c 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -42,8 +42,6 @@ static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 struct nfs_clone_mount {
 	const struct super_block *sb;
 	const struct dentry *dentry;
-	struct nfs_fh *fh;
-	struct nfs_fattr *fattr;
 	char *hostname;
 	char *mnt_path;
 	struct sockaddr *addr;
@@ -413,6 +411,7 @@ struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
 		const char *, struct nfs_mount_info *);
 void nfs_kill_super(struct super_block *);
 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
+void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
 
 extern struct rpc_stat nfs_rpcstat;
 
diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 9287eb666322..7c78e6956639 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -19,6 +19,7 @@
 #include <linux/vfs.h>
 #include <linux/sunrpc/gss_api.h>
 #include "internal.h"
+#include "nfs.h"
 
 #define NFSDBG_FACILITY		NFSDBG_VFS
 
@@ -210,16 +211,6 @@ void nfs_release_automount_timer(void)
 		cancel_delayed_work(&nfs_automount_task);
 }
 
-/*
- * Clone a mountpoint of the appropriate type
- */
-static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
-					   const char *devname,
-					   struct nfs_clone_mount *mountdata)
-{
-	return vfs_submount(mountdata->dentry, &nfs_xdev_fs_type, devname, mountdata);
-}
-
 /**
  * nfs_do_submount - set up mountpoint when crossing a filesystem boundary
  * @dentry: parent directory
@@ -231,13 +222,20 @@ static struct vfsmount *nfs_do_clone_mount(struct nfs_server *server,
 struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
 				 struct nfs_fattr *fattr, rpc_authflavor_t authflavor)
 {
+	struct super_block *sb = dentry->d_sb;
 	struct nfs_clone_mount mountdata = {
-		.sb = dentry->d_sb,
+		.sb = sb,
 		.dentry = dentry,
-		.fh = fh,
-		.fattr = fattr,
 		.authflavor = authflavor,
 	};
+	struct nfs_mount_info mount_info = {
+		.fill_super = nfs_clone_super,
+		.set_security = nfs_clone_sb_security,
+		.cloned = &mountdata,
+		.mntfh = fh,
+	};
+	struct nfs_subversion *nfs_mod = NFS_SB(sb)->nfs_client->cl_nfs_mod;
+	struct nfs_server *server;
 	struct vfsmount *mnt;
 	char *page = (char *) __get_free_page(GFP_USER);
 	char *devname;
@@ -245,12 +243,21 @@ struct vfsmount *nfs_do_submount(struct dentry *dentry, struct nfs_fh *fh,
 	if (page == NULL)
 		return ERR_PTR(-ENOMEM);
 
+	server = nfs_mod->rpc_ops->clone_server(NFS_SB(sb), fh,
+						fattr, authflavor);
+	if (IS_ERR(server))
+		return ERR_CAST(server);
+
+	mount_info.server = server;
+
 	devname = nfs_devname(dentry, page, PAGE_SIZE);
 	if (IS_ERR(devname))
 		mnt = ERR_CAST(devname);
 	else
-		mnt = nfs_do_clone_mount(NFS_SB(dentry->d_sb), devname, &mountdata);
+		mnt = vfs_submount(dentry, &nfs_xdev_fs_type, devname, &mount_info);
 
+	if (mount_info.server)
+		nfs_free_server(mount_info.server);
 	free_page((unsigned long)page);
 	return mnt;
 }
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 10544ef8de57..7fc354207347 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2386,7 +2386,7 @@ EXPORT_SYMBOL_GPL(nfs_fill_super);
 /*
  * Finish setting up a cloned NFS2/3/4 superblock
  */
-static void nfs_clone_super(struct super_block *sb,
+void nfs_clone_super(struct super_block *sb,
 			    struct nfs_mount_info *mount_info)
 {
 	const struct super_block *old_sb = mount_info->cloned->sb;
@@ -2771,27 +2771,10 @@ static struct dentry *
 nfs_xdev_mount(struct file_system_type *fs_type, int flags,
 		const char *dev_name, void *raw_data)
 {
-	struct nfs_clone_mount *data = raw_data;
-	struct nfs_mount_info mount_info = {
-		.fill_super = nfs_clone_super,
-		.set_security = nfs_clone_sb_security,
-		.cloned = data,
-	};
-	struct dentry *mntroot = ERR_PTR(-ENOMEM);
-	struct nfs_subversion *nfs_mod = NFS_SB(data->sb)->nfs_client->cl_nfs_mod;
-
-	dprintk("--> nfs_xdev_mount()\n");
+	struct nfs_mount_info *info = raw_data;
+	struct nfs_subversion *nfs_mod = NFS_SB(info->cloned->sb)->nfs_client->cl_nfs_mod;
 
-	mount_info.mntfh = mount_info.cloned->fh;
-
-	/* create a new volume representation */
-	mount_info.server = nfs_mod->rpc_ops->clone_server(NFS_SB(data->sb), data->fh, data->fattr, data->authflavor);
-
-	mntroot = nfs_fs_mount_common(flags, dev_name, &mount_info, nfs_mod);
-
-	dprintk("<-- nfs_xdev_mount() = %ld\n",
-			IS_ERR(mntroot) ? PTR_ERR(mntroot) : 0L);
-	return mntroot;
+	return nfs_fs_mount_common(flags, dev_name, info, nfs_mod);
 }
 
 #if IS_ENABLED(CONFIG_NFS_V4)
-- 
2.17.2


  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-13 12:17 [PATCH v4 00/26] nfs: Mount API conversion Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 01/26] saner calling conventions for nfs_fs_mount_common() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 02/26] nfs: stash server into struct nfs_mount_info Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 03/26] nfs: lift setting mount_info from nfs4_remote{,_referral}_mount Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 04/26] nfs: fold nfs4_remote_fs_type and nfs4_remote_referral_fs_type Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 05/26] nfs: don't bother setting/restoring export_path around do_nfs_root_mount() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 06/26] nfs4: fold nfs_do_root_mount/nfs_follow_remote_path Scott Mayhew
2019-09-13 12:17 ` Scott Mayhew [this message]
2019-09-13 12:17 ` [PATCH v4 08/26] nfs: stash nfs_subversion reference into nfs_mount_info Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 09/26] nfs: don't bother passing nfs_subversion to ->try_mount() and nfs_fs_mount_common() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 10/26] nfs: merge xdev and remote file_system_type Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 11/26] nfs: unexport nfs_fs_mount_common() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 12/26] nfs: don't pass nfs_subversion to ->create_server() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 13/26] nfs: get rid of mount_info ->fill_super() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 14/26] nfs_clone_sb_security(): simplify the check for server bogosity Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 15/26] nfs: get rid of ->set_security() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 16/26] NFS: Move mount parameterisation bits into their own file Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 17/26] NFS: Constify mount argument match tables Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 18/26] NFS: Rename struct nfs_parsed_mount_data to struct nfs_fs_context Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 19/26] NFS: Split nfs_parse_mount_options() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 20/26] NFS: Deindent nfs_fs_context_parse_option() Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 21/26] NFS: Add a small buffer in nfs_fs_context to avoid string dup Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 22/26] NFS: Do some tidying of the parsing code Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 23/26] NFS: rename nfs_fs_context pointer arg in a few functions Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 24/26] NFS: Convert mount option parsing to use functionality from fs_parser.h Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 25/26] NFS: Add fs_context support Scott Mayhew
2019-09-13 12:17 ` [PATCH v4 26/26] NFS: Attach supplementary error information to fs_context Scott Mayhew

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