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vfs: Convert nfsctl to use the new mount API 

Convert the nfsctl 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: "J. Bruce Fields" <bfields@fieldses.org>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-nfs@vger.kernel.org
alistair/sunxi64-5.4-dsi
David Howells 2019-03-25 16:38:27 +00:00 committed by Al Viro
parent b9662f3103
commit 96a374a35f
1 changed files with 26 additions and 7 deletions
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33
fs/nfsd/nfsctl.c
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@ -7,6 +7,7 @@
#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/ctype.h>
#include <linux/fs_context.h>
#include <linux/sunrpc/svcsock.h>
#include <linux/lockd/lockd.h>
@ -1146,7 +1147,7 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
* populating the filesystem.
*/
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc)
{
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
@ -1176,15 +1177,33 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
#endif
/* last one */ {""}
};
get_net(sb->s_fs_info);
return simple_fill_super(sb, 0x6e667364, nfsd_files);
}
static struct dentry *nfsd_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
static int nfsd_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, nfsd_fill_super);
fc->s_fs_info = get_net(fc->net_ns);
return vfs_get_super(fc, vfs_get_keyed_super, nfsd_fill_super);
}
static void nfsd_fs_free_fc(struct fs_context *fc)
{
if (fc->s_fs_info)
put_net(fc->s_fs_info);
}
static const struct fs_context_operations nfsd_fs_context_ops = {
.free = nfsd_fs_free_fc,
.get_tree = nfsd_fs_get_tree,
};
static int nfsd_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 = &nfsd_fs_context_ops;
return 0;
}
static void nfsd_umount(struct super_block *sb)
@ -1198,7 +1217,7 @@ static void nfsd_umount(struct super_block *sb)
static struct file_system_type nfsd_fs_type = {
.owner = THIS_MODULE,
.name = "nfsd",
.mount = nfsd_mount,
.init_fs_context = nfsd_init_fs_context,
.kill_sb = nfsd_umount,
};
MODULE_ALIAS_FS("nfsd");