This is a note to let you know that I've just added the patch titled
NFSD: Remove svc_serv_ops::svo_module
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
nfsd-remove-svc_serv_ops-svo_module.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit df9ae47d6fcfed86073616098b43d3ba8b708a88
Author: Chuck Lever <chuck.lever@xxxxxxxxxx>
Date: Wed Feb 16 12:31:09 2022 -0500
NFSD: Remove svc_serv_ops::svo_module
[ Upstream commit f49169c97fceb21ad6a0aaf671c50b0f520f15a5 ]
struct svc_serv_ops is about to be removed.
Neil Brown says:
> I suspect svo_module can go as well - I don't think the thread is
> ever the thing that primarily keeps a module active.
A random sample of kthread_create() callers shows sunrpc is the only
one that manages module reference count in this way.
Suggested-by: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index c83ec4a375bc1..bfde31124f3af 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -184,8 +184,7 @@ lockd(void *vrqstp)
dprintk("lockd_down: service stopped\n");
svc_exit_thread(rqstp);
-
- module_put_and_kthread_exit(0);
+ return 0;
}
static int create_lockd_listener(struct svc_serv *serv, const char *name,
@@ -352,7 +351,6 @@ static struct notifier_block lockd_inet6addr_notifier = {
static const struct svc_serv_ops lockd_sv_ops = {
.svo_function = lockd,
- .svo_module = THIS_MODULE,
};
static int lockd_get(void)
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index c98c68513590f..a494f9e7bd0a0 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -17,7 +17,6 @@
#include <linux/errno.h>
#include <linux/mutex.h>
#include <linux/freezer.h>
-#include <linux/kthread.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/bc_xprt.h>
@@ -92,8 +91,8 @@ nfs4_callback_svc(void *vrqstp)
continue;
svc_process(rqstp);
}
+
svc_exit_thread(rqstp);
- module_put_and_kthread_exit(0);
return 0;
}
@@ -136,8 +135,8 @@ nfs41_callback_svc(void *vrqstp)
finish_wait(&serv->sv_cb_waitq, &wq);
}
}
+
svc_exit_thread(rqstp);
- module_put_and_kthread_exit(0);
return 0;
}
@@ -234,12 +233,10 @@ static int nfs_callback_up_net(int minorversion, struct svc_serv *serv,
static const struct svc_serv_ops nfs40_cb_sv_ops = {
.svo_function = nfs4_callback_svc,
- .svo_module = THIS_MODULE,
};
#if defined(CONFIG_NFS_V4_1)
static const struct svc_serv_ops nfs41_cb_sv_ops = {
.svo_function = nfs41_callback_svc,
- .svo_module = THIS_MODULE,
};
static const struct svc_serv_ops *nfs4_cb_sv_ops[] = {
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index d8fc5d72a161c..ae2da65ffbafb 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2757,7 +2757,6 @@ static int nfs4_run_state_manager(void *ptr)
goto again;
nfs_put_client(clp);
- module_put_and_kthread_exit(0);
return 0;
}
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 38895372ec393..d25d4c12a499a 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -614,7 +614,6 @@ static int nfsd_get_default_max_blksize(void)
static const struct svc_serv_ops nfsd_thread_sv_ops = {
.svo_function = nfsd,
- .svo_module = THIS_MODULE,
};
void nfsd_shutdown_threads(struct net *net)
@@ -1018,8 +1017,6 @@ nfsd(void *vrqstp)
msleep(20);
}
- /* Release module */
- module_put_and_kthread_exit(0);
return 0;
}
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 482a024156b11..c64db9b14a643 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -57,11 +57,6 @@ struct svc_serv;
struct svc_serv_ops {
/* function for service threads to run */
int (*svo_function)(void *);
-
- /* optional module to count when adding threads.
- * Thread function must call module_put_and_kthread_exit() to exit.
- */
- struct module *svo_module;
};
/*
diff --git a/kernel/module.c b/kernel/module.c
index 9030ff8c08555..edc7b99cb16fa 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -334,7 +334,7 @@ static inline void add_taint_module(struct module *mod, unsigned flag,
/*
* A thread that wants to hold a reference to a module only while it
- * is running can call this to safely exit. nfsd and lockd use this.
+ * is running can call this to safely exit.
*/
void __noreturn __module_put_and_kthread_exit(struct module *mod, long code)
{
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index c9195e40959c6..bdecc902cf998 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -734,11 +734,9 @@ svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
if (IS_ERR(rqstp))
return PTR_ERR(rqstp);
- __module_get(serv->sv_ops->svo_module);
task = kthread_create_on_node(serv->sv_ops->svo_function, rqstp,
node, "%s", serv->sv_name);
if (IS_ERR(task)) {
- module_put(serv->sv_ops->svo_module);
svc_exit_thread(rqstp);
return PTR_ERR(task);
}
