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NFSD: Add /sys/kernel/debug/nfsd

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Create a small sandbox under /sys/kernel/debug for experimental NFS
server feature settings. There is no API/ABI compatibility guarantee
for these settings.

The only documentation for such settings, if any documentation exists,
is in the kernel source code.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2025-03-08 15:14:37 -05:00
parent f7fb730cac
commit 9fe5ea760e
4 changed files with 31 additions and 0 deletions
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1
fs/nfsd/Makefile
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@@ -24,6 +24,7 @@ nfsd-$(CONFIG_NFSD_BLOCKLAYOUT) += blocklayout.o blocklayoutxdr.o
nfsd-$(CONFIG_NFSD_SCSILAYOUT) += blocklayout.o blocklayoutxdr.o nfsd-$(CONFIG_NFSD_SCSILAYOUT) += blocklayout.o blocklayoutxdr.o
nfsd-$(CONFIG_NFSD_FLEXFILELAYOUT) += flexfilelayout.o flexfilelayoutxdr.o nfsd-$(CONFIG_NFSD_FLEXFILELAYOUT) += flexfilelayout.o flexfilelayoutxdr.o
nfsd-$(CONFIG_NFS_LOCALIO) += localio.o nfsd-$(CONFIG_NFS_LOCALIO) += localio.o
nfsd-$(CONFIG_DEBUG_FS) += debugfs.o
.PHONY: xdrgen .PHONY: xdrgen

18
fs/nfsd/debugfs.c Normal file
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@@ -0,0 +1,18 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/debugfs.h>
#include "nfsd.h"
static struct dentry *nfsd_top_dir __read_mostly;
void nfsd_debugfs_exit(void)
{
debugfs_remove_recursive(nfsd_top_dir);
nfsd_top_dir = NULL;
}
void nfsd_debugfs_init(void)
{
nfsd_top_dir = debugfs_create_dir("nfsd", NULL);
}

4
fs/nfsd/nfsctl.c
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@@ -2281,6 +2281,8 @@ static int __init init_nfsd(void)
{ {
int retval; int retval;
nfsd_debugfs_init();
retval = nfsd4_init_slabs(); retval = nfsd4_init_slabs();
if (retval) if (retval)
return retval; return retval;
@@ -2329,6 +2331,7 @@ static int __init init_nfsd(void)
nfsd4_exit_pnfs(); nfsd4_exit_pnfs();
out_free_slabs: out_free_slabs:
nfsd4_free_slabs(); nfsd4_free_slabs();
nfsd_debugfs_exit();
return retval; return retval;
} }
@@ -2345,6 +2348,7 @@ static void __exit exit_nfsd(void)
nfsd_lockd_shutdown(); nfsd_lockd_shutdown();
nfsd4_free_slabs(); nfsd4_free_slabs();
nfsd4_exit_pnfs(); nfsd4_exit_pnfs();
nfsd_debugfs_exit();
} }
MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");

8
fs/nfsd/nfsd.h
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@@ -156,6 +156,14 @@ void nfsd_reset_versions(struct nfsd_net *nn);
int nfsd_create_serv(struct net *net); int nfsd_create_serv(struct net *net);
void nfsd_destroy_serv(struct net *net); void nfsd_destroy_serv(struct net *net);
#ifdef CONFIG_DEBUG_FS
void nfsd_debugfs_init(void);
void nfsd_debugfs_exit(void);
#else
static inline void nfsd_debugfs_init(void) {}
static inline void nfsd_debugfs_exit(void) {}
#endif
extern int nfsd_max_blksize; extern int nfsd_max_blksize;
static inline int nfsd_v4client(struct svc_rqst *rq) static inline int nfsd_v4client(struct svc_rqst *rq)