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vfs: Convert rpc_pipefs to use the new mount API 

Convert the rpc_pipefs filesystem to the new internal mount API as the old
one will be obsoleted and removed.  This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.

See Documentation/filesystems/mount_api.txt for more information.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Trond Myklebust <trond.myklebust@hammerspace.com>
cc: Anna Schumaker <anna.schumaker@netapp.com>
cc: "J. Bruce Fields" <bfields@fieldses.org>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-nfs@vger.kernel.org
This commit is contained in:
David Howells 2019-03-25 16:38:28 +00:00 committed by Al Viro
parent 0ce0cf12fc
commit b9662f3103
1 changed files with 26 additions and 8 deletions
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34
net/sunrpc/rpc_pipe.c
View File

@ -13,6 +13,7 @@
#include <linux/string.h>
#include <linux/pagemap.h>
#include <linux/mount.h>
#include <linux/fs_context.h>
#include <linux/namei.h>
#include <linux/fsnotify.h>
#include <linux/kernel.h>
@ -1347,11 +1348,11 @@ rpc_gssd_dummy_depopulate(struct dentry *pipe_dentry)
}
static int
rpc_fill_super(struct super_block *sb, void *data, int silent)
rpc_fill_super(struct super_block *sb, struct fs_context *fc)
{
struct inode *inode;
struct dentry *root, *gssd_dentry;
struct net *net = get_net(sb->s_fs_info);
struct net *net = sb->s_fs_info;
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
int err;
@ -1408,12 +1409,29 @@ gssd_running(struct net *net)
}
EXPORT_SYMBOL_GPL(gssd_running);
static struct dentry *
rpc_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
static int rpc_fs_get_tree(struct fs_context *fc)
{
struct net *net = current->nsproxy->net_ns;
return mount_ns(fs_type, flags, data, net, net->user_ns, rpc_fill_super);
fc->s_fs_info = get_net(fc->net_ns);
return vfs_get_super(fc, vfs_get_keyed_super, rpc_fill_super);
}
static void rpc_fs_free_fc(struct fs_context *fc)
{
if (fc->s_fs_info)
put_net(fc->s_fs_info);
}
static const struct fs_context_operations rpc_fs_context_ops = {
.free = rpc_fs_free_fc,
.get_tree = rpc_fs_get_tree,
};
static int rpc_init_fs_context(struct fs_context *fc)
{
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(fc->net_ns->user_ns);
fc->ops = &rpc_fs_context_ops;
return 0;
}
static void rpc_kill_sb(struct super_block *sb)
@ -1441,7 +1459,7 @@ static void rpc_kill_sb(struct super_block *sb)
static struct file_system_type rpc_pipe_fs_type = {
.owner = THIS_MODULE,
.name = "rpc_pipefs",
.mount = rpc_mount,
.init_fs_context = rpc_init_fs_context,
.kill_sb = rpc_kill_sb,
};
MODULE_ALIAS_FS("rpc_pipefs");