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nfsd4: add a client info file

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Add a new nfsd/clients/#/info file with some basic information about
each NFSv4 client.

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
J. Bruce Fields
2019-04-09 15:56:57 -04:00
parent bf5ed3e3bb
commit 97ad4031e2
3 changed files with 149 additions and 9 deletions
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116
fs/nfsd/nfsctl.c
View File

@@ -1208,14 +1208,116 @@ out_err:
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)
static void clear_ncl(struct inode *inode)
{
struct nfsdfs_client *ncl = inode->i_private;
inode->i_private = NULL;
synchronize_rcu();
kref_put(&ncl->cl_ref, ncl->cl_release);
}
struct nfsdfs_client *__get_nfsdfs_client(struct inode *inode)
{
struct nfsdfs_client *nc = inode->i_private;
if (nc)
kref_get(&nc->cl_ref);
return nc;
}
struct nfsdfs_client *get_nfsdfs_client(struct inode *inode)
{
struct nfsdfs_client *nc;
rcu_read_lock();
nc = __get_nfsdfs_client(inode);
rcu_read_unlock();
return nc;
}
/* from __rpc_unlink */
static void nfsdfs_remove_file(struct inode *dir, struct dentry *dentry)
{
int ret;
clear_ncl(d_inode(dentry));
dget(dentry);
ret = simple_unlink(dir, dentry);
d_delete(dentry);
dput(dentry);
WARN_ON_ONCE(ret);
}
static void nfsdfs_remove_files(struct dentry *root)
{
struct dentry *dentry, *tmp;
list_for_each_entry_safe(dentry, tmp, &root->d_subdirs, d_child) {
if (!simple_positive(dentry)) {
WARN_ON_ONCE(1); /* I think this can't happen? */
continue;
}
nfsdfs_remove_file(d_inode(root), dentry);
}
}
/* XXX: cut'n'paste from simple_fill_super; figure out if we could share
* code instead. */
static int nfsdfs_create_files(struct dentry *root,
const struct tree_descr *files)
{
struct inode *dir = d_inode(root);
struct inode *inode;
struct dentry *dentry;
int i;
inode_lock(dir);
for (i = 0; files->name && files->name[0]; i++, files++) {
if (!files->name)
continue;
dentry = d_alloc_name(root, files->name);
if (!dentry)
goto out;
inode = nfsd_get_inode(d_inode(root)->i_sb,
S_IFREG | files->mode);
if (!inode) {
dput(dentry);
goto out;
}
inode->i_fop = files->ops;
inode->i_private = __get_nfsdfs_client(dir);
d_add(dentry, inode);
fsnotify_create(dir, dentry);
}
inode_unlock(dir);
return 0;
out:
nfsdfs_remove_files(root);
inode_unlock(dir);
return -ENOMEM;
}
/* on success, returns positive number unique to that client. */
struct dentry *nfsd_client_mkdir(struct nfsd_net *nn,
struct nfsdfs_client *ncl, u32 id,
const struct tree_descr *files)
{
struct dentry *dentry;
char name[11];
int ret;
sprintf(name, "%u", id);
return nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name);
if (IS_ERR(dentry)) /* XXX: tossing errors? */
return NULL;
ret = nfsdfs_create_files(dentry, files);
if (ret) {
nfsd_client_rmdir(dentry);
return NULL;
}
return dentry;
}
/* Taken from __rpc_rmdir: */
@@ -1223,16 +1325,16 @@ 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);
inode_lock(dir);
nfsdfs_remove_files(dentry);
clear_ncl(inode);
dget(dentry);
ret = simple_rmdir(dir, dentry);
WARN_ON_ONCE(ret);
d_delete(dentry);
inode_unlock(dir);
}
static int nfsd_fill_super(struct super_block * sb, void * data, int silent)