summaryrefslogtreecommitdiff
path: root/fs/nfsd/nfs4recover.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/nfsd/nfs4recover.c')
-rw-r--r--fs/nfsd/nfs4recover.c113
1 files changed, 69 insertions, 44 deletions
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 892fecce18b8..1c8fcb04b3cd 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -66,6 +66,7 @@ struct nfsd4_client_tracking_ops {
static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops;
static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2;
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
/* Globals */
static char user_recovery_dirname[PATH_MAX] = "/var/lib/nfs/v4recovery";
@@ -721,6 +722,7 @@ static const struct nfsd4_client_tracking_ops nfsd4_legacy_tracking_ops = {
.version = 1,
.msglen = 0,
};
+#endif /* CONFIG_NFSD_LEGACY_CLIENT_TRACKING */
/* Globals */
#define NFSD_PIPE_DIR "nfsd"
@@ -732,8 +734,10 @@ struct cld_net {
spinlock_t cn_lock;
struct list_head cn_list;
unsigned int cn_xid;
- bool cn_has_legacy;
struct crypto_shash *cn_tfm;
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
+ bool cn_has_legacy;
+#endif
};
struct cld_upcall {
@@ -794,7 +798,6 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
uint8_t cmd, princhashlen;
struct xdr_netobj name, princhash = { .len = 0, .data = NULL };
uint16_t namelen;
- struct cld_net *cn = nn->cld_net;
if (get_user(cmd, &cmsg->cm_cmd)) {
dprintk("%s: error when copying cmd from userspace", __func__);
@@ -807,8 +810,8 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
ci = &cmsg->cm_u.cm_clntinfo;
if (get_user(namelen, &ci->cc_name.cn_len))
return -EFAULT;
- if (!namelen) {
- dprintk("%s: namelen should not be zero", __func__);
+ if (namelen == 0 || namelen > NFS4_OPAQUE_LIMIT) {
+ dprintk("%s: invalid namelen (%u)", __func__, namelen);
return -EINVAL;
}
name.data = memdup_user(&ci->cc_name.cn_id, namelen);
@@ -833,8 +836,8 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
cnm = &cmsg->cm_u.cm_name;
if (get_user(namelen, &cnm->cn_len))
return -EFAULT;
- if (!namelen) {
- dprintk("%s: namelen should not be zero", __func__);
+ if (namelen == 0 || namelen > NFS4_OPAQUE_LIMIT) {
+ dprintk("%s: invalid namelen (%u)", __func__, namelen);
return -EINVAL;
}
name.data = memdup_user(&cnm->cn_id, namelen);
@@ -842,11 +845,15 @@ __cld_pipe_inprogress_downcall(const struct cld_msg_v2 __user *cmsg,
return PTR_ERR(name.data);
name.len = namelen;
}
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
if (name.len > 5 && memcmp(name.data, "hash:", 5) == 0) {
+ struct cld_net *cn = nn->cld_net;
+
name.len = name.len - 5;
memmove(name.data, name.data + 5, name.len);
cn->cn_has_legacy = true;
}
+#endif
if (!nfs4_client_to_reclaim(name, princhash, nn)) {
kfree(name.data);
kfree(princhash.data);
@@ -1019,7 +1026,9 @@ __nfsd4_init_cld_pipe(struct net *net)
}
cn->cn_pipe->dentry = dentry;
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
cn->cn_has_legacy = false;
+#endif
nn->cld_net = cn;
return 0;
@@ -1291,10 +1300,6 @@ nfsd4_cld_check(struct nfs4_client *clp)
{
struct nfs4_client_reclaim *crp;
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
- struct cld_net *cn = nn->cld_net;
- int status;
- char dname[HEXDIR_LEN];
- struct xdr_netobj name;
/* did we already find that this client is stable? */
if (test_bit(NFSD4_CLIENT_STABLE, &clp->cl_flags))
@@ -1305,7 +1310,12 @@ nfsd4_cld_check(struct nfs4_client *clp)
if (crp)
goto found;
- if (cn->cn_has_legacy) {
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
+ if (nn->cld_net->cn_has_legacy) {
+ int status;
+ char dname[HEXDIR_LEN];
+ struct xdr_netobj name;
+
status = nfs4_make_rec_clidname(dname, &clp->cl_name);
if (status)
return -ENOENT;
@@ -1323,6 +1333,7 @@ nfsd4_cld_check(struct nfs4_client *clp)
goto found;
}
+#endif
return -ENOENT;
found:
crp->cr_clp = clp;
@@ -1336,8 +1347,6 @@ nfsd4_cld_check_v2(struct nfs4_client *clp)
struct nfsd_net *nn = net_generic(clp->net, nfsd_net_id);
struct cld_net *cn = nn->cld_net;
int status;
- char dname[HEXDIR_LEN];
- struct xdr_netobj name;
struct crypto_shash *tfm = cn->cn_tfm;
struct xdr_netobj cksum;
char *principal = NULL;
@@ -1351,7 +1360,11 @@ nfsd4_cld_check_v2(struct nfs4_client *clp)
if (crp)
goto found;
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
if (cn->cn_has_legacy) {
+ struct xdr_netobj name;
+ char dname[HEXDIR_LEN];
+
status = nfs4_make_rec_clidname(dname, &clp->cl_name);
if (status)
return -ENOENT;
@@ -1369,6 +1382,7 @@ nfsd4_cld_check_v2(struct nfs4_client *clp)
goto found;
}
+#endif
return -ENOENT;
found:
if (crp->cr_princhash.len) {
@@ -1672,6 +1686,7 @@ static const struct nfsd4_client_tracking_ops nfsd4_cld_tracking_ops_v2 = {
.msglen = sizeof(struct cld_msg_v2),
};
+#ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING
/* upcall via usermodehelper */
static char cltrack_prog[PATH_MAX] = "/sbin/nfsdcltrack";
module_param_string(cltrack_prog, cltrack_prog, sizeof(cltrack_prog),
@@ -1889,10 +1904,7 @@ nfsd4_cltrack_upcall_lock(struct nfs4_client *clp)
static void
nfsd4_cltrack_upcall_unlock(struct nfs4_client *clp)
{
- smp_mb__before_atomic();
- clear_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
- smp_mb__after_atomic();
- wake_up_bit(&clp->cl_flags, NFSD4_CLIENT_UPCALL_LOCK);
+ clear_and_wake_up_bit(NFSD4_CLIENT_UPCALL_LOCK, &clp->cl_flags);
}
static void
@@ -2016,28 +2028,10 @@ static const struct nfsd4_client_tracking_ops nfsd4_umh_tracking_ops = {
.msglen = 0,
};
-int
-nfsd4_client_tracking_init(struct net *net)
+static inline int check_for_legacy_methods(int status, struct net *net)
{
- int status;
- struct path path;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
-
- /* just run the init if it the method is already decided */
- if (nn->client_tracking_ops)
- goto do_init;
-
- /* First, try to use nfsdcld */
- nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
- status = nn->client_tracking_ops->init(net);
- if (!status)
- return status;
- if (status != -ETIMEDOUT) {
- nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
- status = nn->client_tracking_ops->init(net);
- if (!status)
- return status;
- }
+ struct path path;
/*
* Next, try the UMH upcall.
@@ -2054,20 +2048,51 @@ nfsd4_client_tracking_init(struct net *net)
nn->client_tracking_ops = &nfsd4_legacy_tracking_ops;
status = kern_path(nfs4_recoverydir(), LOOKUP_FOLLOW, &path);
if (!status) {
- status = d_is_dir(path.dentry);
+ status = !d_is_dir(path.dentry);
path_put(&path);
- if (!status) {
- status = -EINVAL;
- goto out;
- }
+ if (status)
+ return -ENOTDIR;
}
+ return status;
+}
+#else
+static inline int check_for_legacy_methods(int status, struct net *net)
+{
+ return status;
+}
+#endif /* CONFIG_LEGACY_NFSD_CLIENT_TRACKING */
+int
+nfsd4_client_tracking_init(struct net *net)
+{
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ int status;
+
+ /* just run the init if it the method is already decided */
+ if (nn->client_tracking_ops)
+ goto do_init;
+
+ /* First, try to use nfsdcld */
+ nn->client_tracking_ops = &nfsd4_cld_tracking_ops;
+ status = nn->client_tracking_ops->init(net);
+ if (!status)
+ return status;
+ if (status != -ETIMEDOUT) {
+ nn->client_tracking_ops = &nfsd4_cld_tracking_ops_v0;
+ status = nn->client_tracking_ops->init(net);
+ if (!status)
+ return status;
+ }
+
+ status = check_for_legacy_methods(status, net);
+ if (status)
+ goto out;
do_init:
status = nn->client_tracking_ops->init(net);
out:
if (status) {
- printk(KERN_WARNING "NFSD: Unable to initialize client "
- "recovery tracking! (%d)\n", status);
+ pr_warn("NFSD: Unable to initialize client recovery tracking! (%d)\n", status);
+ pr_warn("NFSD: Is nfsdcld running? If not, enable CONFIG_NFSD_LEGACY_CLIENT_TRACKING.\n");
nn->client_tracking_ops = NULL;
}
return status;
generated by cgit v1.2.3 (git 2.39.0) at 2025-08-29 08:00:39 +0300