From: Andy Adamson <andros@xxxxxxxxxx>
Use the small id to pointer translator service to provide a unique callback
identifier per SETCLIENTID call used to identify the v4.0 callback service
associated with the clientid.
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
---
fs/nfs/client.c | 51 +++++++++++++++++++++++++++++++++++++++++++++
fs/nfs/inode.c | 1 +
fs/nfs/internal.h | 1 +
fs/nfs/nfs4proc.c | 1 +
include/linux/nfs_fs_sb.h | 1 +
5 files changed, 55 insertions(+), 0 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 855add6..bc3a862 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -56,6 +56,30 @@ static DEFINE_SPINLOCK(nfs_client_lock);
static LIST_HEAD(nfs_client_list);
static LIST_HEAD(nfs_volume_list);
static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
+#ifdef CONFIG_NFS_V4
+static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
+
+/*
+ * Get a unique NFSv4.0 callback identifier which will be used
+ * by the V4.0 callback service to lookup the nfs_client struct
+ */
+static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
+{
+ int ret = 0;
+
+ if (clp->rpc_ops->version != 4 || minorversion != 0)
+ return ret;
+retry:
+ if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
+ return -ENOMEM;
+ spin_lock(&nfs_client_lock);
+ ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
+ spin_unlock(&nfs_client_lock);
+ if (ret == -EAGAIN)
+ goto retry;
+ return ret;
+}
+#endif /* CONFIG_NFS_V4 */
/*
* RPC cruft for NFS
@@ -144,6 +168,10 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
clp->cl_proto = cl_init->proto;
#ifdef CONFIG_NFS_V4
+ err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
+ if (err)
+ goto error_cleanup;
+
INIT_LIST_HEAD(&clp->cl_delegations);
spin_lock_init(&clp->cl_lock);
INIT_DELAYED_WORK(&clp->cl_renewd, nfs4_renew_state);
@@ -202,10 +230,32 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
rpc_destroy_wait_queue(&clp->cl_rpcwaitq);
}
+
+/* idr_remove_all is not needed as all id's are removed by nfs_put_client */
+void nfs_cleanup_cb_ident_idr(void)
+{
+ idr_destroy(&cb_ident_idr);
+}
+
+/* nfs_client_lock held */
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+ if (clp->cl_cb_ident)
+ idr_remove(&cb_ident_idr, clp->cl_cb_ident);
+}
+
#else
static void nfs4_shutdown_client(struct nfs_client *clp)
{
}
+
+void nfs_cleanup_cb_ident_idr(void)
+{
+}
+
+static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
+{
+}
#endif /* CONFIG_NFS_V4 */
/*
@@ -244,6 +294,7 @@ void nfs_put_client(struct nfs_client *clp)
if (atomic_dec_and_lock(&clp->cl_count, &nfs_client_lock)) {
list_del(&clp->cl_share_link);
+ nfs_cb_idr_remove_locked(clp);
spin_unlock(&nfs_client_lock);
BUG_ON(!list_empty(&clp->cl_superblocks));
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index e67e31c..c7782b2 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1612,6 +1612,7 @@ static void __exit exit_nfs_fs(void)
#ifdef CONFIG_PROC_FS
rpc_proc_unregister("nfs");
#endif
+ nfs_cleanup_cb_ident_idr();
unregister_nfs_fs();
nfs_fs_proc_exit();
nfsiod_stop();
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index 435eae3..7c803c9 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -128,6 +128,7 @@ extern void nfs_umount(const struct nfs_mount_request *info);
/* client.c */
extern struct rpc_program nfs_program;
+extern void nfs_cleanup_cb_ident_idr(void);
extern void nfs_put_client(struct nfs_client *);
extern struct nfs_client *nfs_find_client(const struct sockaddr *, u32);
extern struct nfs_client *nfs_find_client_next(struct nfs_client *);
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 78b0899..d3510ba 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3478,6 +3478,7 @@ int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
struct nfs4_setclientid setclientid = {
.sc_verifier = &sc_verifier,
.sc_prog = program,
+ .sc_cb_ident = clp->cl_cb_ident,
};
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 452d964..1eaa054 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -71,6 +71,7 @@ struct nfs_client {
*/
char cl_ipaddr[48];
unsigned char cl_id_uniquifier;
+ u32 cl_cb_ident; /* v4.0 callback identifier */
const struct nfs4_minor_version_ops *cl_mvops;
#endif /* CONFIG_NFS_V4 */
--
1.6.6
--
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