nfsd: add nfsd/clients directory

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

View File

@ -45,6 +45,8 @@ struct nfsd_net {
/* internal mount of the "nfsd" pseudofilesystem: */
struct vfsmount *nfsd_mnt;
struct dentry *nfsd_client_dir;
/*
* reclaim_str_hashtbl[] holds known client info from previous reset/reboot
* used in reboot/reset lease grace period processing

View File

@ -1881,20 +1881,19 @@ err_no_name:
static void __free_client(struct kref *k)
{
struct nfs4_client *clp = container_of(k, struct nfs4_client, cl_ref);
struct nfsdfs_client *c = container_of(k, struct nfsdfs_client, cl_ref);
struct nfs4_client *clp = container_of(c, struct nfs4_client, cl_nfsdfs);
free_svc_cred(&clp->cl_cred);
kfree(clp->cl_ownerstr_hashtbl);
kfree(clp->cl_name.data);
idr_destroy(&clp->cl_stateids);
if (clp->cl_nfsd_dentry)
nfsd_client_rmdir(clp->cl_nfsd_dentry);
kmem_cache_free(client_slab, clp);
}
void drop_client(struct nfs4_client *clp)
{
kref_put(&clp->cl_ref, __free_client);
kref_put(&clp->cl_nfsdfs.cl_ref, __free_client);
}
static void
@ -1909,6 +1908,8 @@ free_client(struct nfs4_client *clp)
free_session(ses);
}
rpc_destroy_wait_queue(&clp->cl_cb_waitq);
if (clp->cl_nfsd_dentry)
nfsd_client_rmdir(clp->cl_nfsd_dentry);
drop_client(clp);
}
@ -2220,6 +2221,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
struct sockaddr *sa = svc_addr(rqstp);
int ret;
struct net *net = SVC_NET(rqstp);
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
clp = alloc_client(name);
if (clp == NULL)
@ -2230,8 +2232,8 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
free_client(clp);
return NULL;
}
kref_init(&clp->cl_ref);
gen_clid(clp, nn);
kref_init(&clp->cl_nfsdfs.cl_ref);
nfsd4_init_cb(&clp->cl_cb_null, clp, NULL, NFSPROC4_CLNT_CB_NULL);
clp->cl_time = get_seconds();
clear_bit(0, &clp->cl_cb_slot_busy);
@ -2239,6 +2241,12 @@ static struct nfs4_client *create_client(struct xdr_netobj name,
rpc_copy_addr((struct sockaddr *) &clp->cl_addr, sa);
clp->cl_cb_session = NULL;
clp->net = net;
clp->cl_nfsd_dentry = nfsd_client_mkdir(nn, &clp->cl_nfsdfs,
clp->cl_clientid.cl_id);
if (!clp->cl_nfsd_dentry) {
free_client(clp);
return NULL;
}
return clp;
}
@ -2683,7 +2691,6 @@ out_new:
new->cl_spo_must_allow.u.words[0] = exid->spo_must_allow[0];
new->cl_spo_must_allow.u.words[1] = exid->spo_must_allow[1];
gen_clid(new, nn);
add_to_unconfirmed(new);
swap(new, conf);
out_copy:
@ -3427,7 +3434,7 @@ nfsd4_setclientid(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate,
copy_clid(new, conf);
gen_confirm(new, nn);
} else /* case 4 (new client) or cases 2, 3 (client reboot): */
gen_clid(new, nn);
;
new->cl_minorversion = 0;
gen_callback(new, setclid, rqstp);
add_to_unconfirmed(new);

View File

@ -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,

View File

@ -22,6 +22,7 @@
#include <uapi/linux/nfsd/debug.h>
#include "netns.h"
#include "stats.h"
#include "export.h"
@ -86,6 +87,14 @@ int nfsd_pool_stats_release(struct inode *, struct file *);
void nfsd_destroy(struct net *net);
struct nfsdfs_client {
struct kref cl_ref;
void (*cl_release)(struct kref *kref);
};
struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, struct nfsdfs_client *ncl, u32 id);
void nfsd_client_rmdir(struct dentry *dentry);
#if defined(CONFIG_NFSD_V2_ACL) || defined(CONFIG_NFSD_V3_ACL)
#ifdef CONFIG_NFSD_V2_ACL
extern const struct svc_version nfsd_acl_version2;

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@ -39,6 +39,7 @@
#include <linux/refcount.h>
#include <linux/sunrpc/svc_xprt.h>
#include "nfsfh.h"
#include "nfsd.h"
typedef struct {
u32 cl_boot;
@ -348,9 +349,12 @@ struct nfs4_client {
u32 cl_exchange_flags;
/* number of rpc's in progress over an associated session: */
atomic_t cl_rpc_users;
struct kref cl_ref;
struct nfsdfs_client cl_nfsdfs;
struct nfs4_op_map cl_spo_must_allow;
/* debugging info directory under nfsd/clients/ : */
struct dentry *cl_nfsd_dentry;
/* for nfs41 callbacks */
/* We currently support a single back channel with a single slot */
unsigned long cl_cb_slot_busy;