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nfsd: add nfsd/clients directory

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I plan to expose some information about nfsv4 clients here.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
2019-03-22 11:11:06 -04:00
parent 59f8e91b75
commit e8a79fb14f
5 changed files with 133 additions and 10 deletions
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103
fs/nfsd/nfsctl.c
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@@ -16,6 +16,7 @@
#include <linux/sunrpc/gss_krb5_enctypes.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/module.h>
#include <linux/fsnotify.h>
#include "idmap.h"
#include "nfsd.h"
@@ -53,6 +54,7 @@ enum {
NFSD_RecoveryDir,
NFSD_V4EndGrace,
#endif
NFSD_MaxReserved
};
/*
@@ -1147,8 +1149,99 @@ static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size)
* populating the filesystem.
*/
/* Basically copying rpc_get_inode. */
static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode)
{
struct inode *inode = new_inode(sb);
if (!inode)
return NULL;
/* Following advice from simple_fill_super documentation: */
inode->i_ino = iunique(sb, NFSD_MaxReserved);
inode->i_mode = mode;
inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
switch (mode & S_IFMT) {
case S_IFDIR:
inode->i_fop = &simple_dir_operations;
inode->i_op = &simple_dir_inode_operations;
inc_nlink(inode);
default:
break;
}
return inode;
}
static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
struct inode *inode;
inode = nfsd_get_inode(dir->i_sb, mode);
if (!inode)
return -ENOMEM;
d_add(dentry, inode);
inc_nlink(dir);
fsnotify_mkdir(dir, dentry);
return 0;
}
static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name)
{
struct inode *dir = parent->d_inode;
struct dentry *dentry;
int ret = -ENOMEM;
inode_lock(dir);
dentry = d_alloc_name(parent, name);
if (!dentry)
goto out_err;
ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600);
if (ret)
goto out_err;
if (ncl) {
d_inode(dentry)->i_private = ncl;
kref_get(&ncl->cl_ref);
}
out:
inode_unlock(dir);
return dentry;
out_err:
dentry = ERR_PTR(ret);
goto out;
}
/* on success, returns positive number unique to that client. */
struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, struct nfsdfs_client *ncl, u32 id)
{
char name[11];
sprintf(name, "%d", id++);
return nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
}
/* Taken from __rpc_rmdir: */
void nfsd_client_rmdir(struct dentry *dentry)
{
struct inode *dir = d_inode(dentry->d_parent);
struct inode *inode = d_inode(dentry);
struct nfsdfs_client *ncl = inode->i_private;
int ret;
inode->i_private = NULL;
synchronize_rcu();
kref_put(&ncl->cl_ref, ncl->cl_release);
dget(dentry);
ret = simple_rmdir(dir, dentry);
WARN_ON_ONCE(ret);
d_delete(dentry);
}
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
{
struct nfsd_net *nn = net_generic(current->nsproxy->net_ns,
nfsd_net_id);
struct dentry *dentry;
int ret;
static const struct tree_descr nfsd_files[] = {
[NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO},
[NFSD_Export_features] = {"export_features",
@@ -1178,7 +1271,15 @@ static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
/* last one */ {""}
};
get_net(sb->s_fs_info);
return simple_fill_super(sb, 0x6e667364, nfsd_files);
ret = simple_fill_super(sb, 0x6e667364, nfsd_files);
if (ret)
return ret;
dentry = nfsd_mkdir(sb->s_root, NULL, "clients");
if (IS_ERR(dentry))
return PTR_ERR(dentry);
nn->nfsd_client_dir = dentry;
return 0;
}
static struct dentry *nfsd_mount(struct file_system_type *fs_type,