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Message-ID: <155862821282.26654.17943634417357032949.stgit@warthog.procyon.org.uk>
Date: Thu, 23 May 2019 17:16:52 +0100
From: David Howells <dhowells@...hat.com>
To: trond.myklebust@...merspace.com, anna.schumaker@...app.com
Cc: Al Viro <viro@...iv.linux.org.uk>, dhowells@...hat.com,
viro@...iv.linux.org.uk, linux-nfs@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 07/23] nfs: lift setting mount_info from nfs_xdev_mount()
From: Al Viro <viro@...iv.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@...hat.com>
Signed-off-by: Al Viro <viro@...iv.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 ce00e61b9b2a..496a0e03f2b2 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;
@@ -412,6 +410,7 @@ 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 15f099a24c29..9622575682da 100644
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -18,6 +18,7 @@
#include <linux/vfs.h>
#include <linux/sunrpc/gss_api.h>
#include "internal.h"
+#include "nfs.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -209,16 +210,6 @@ 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
@@ -230,13 +221,20 @@ 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;
@@ -244,12 +242,21 @@ 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 485604fa2ae3..f0a8f1da394b 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2363,7 +2363,7 @@ 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;
@@ -2748,27 +2748,10 @@ 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)
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