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// SPDX-License-Identifier: GPL-2.0
#include <linux/debugfs.h>
#include "nfsd.h"
static struct dentry *nfsd_top_dir __read_mostly;
/*
* /sys/kernel/debug/nfsd/disable-splice-read
*
* Contents:
* %0: NFS READ is allowed to use page splicing
* %1: NFS READ uses only iov iter read
*
* The default value of this setting is zero (page splicing is
* allowed). This setting takes immediate effect for all NFS
* versions, all exports, and in all NFSD net namespaces.
*/
static int nfsd_dsr_get(void *data, u64 *val)
{
*val = nfsd_disable_splice_read ? 1 : 0;
return 0;
}
static int nfsd_dsr_set(void *data, u64 val)
{
nfsd_disable_splice_read = (val > 0) ? true : false;
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(nfsd_dsr_fops, nfsd_dsr_get, nfsd_dsr_set, "%llu\n");
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);
debugfs_create_file("disable-splice-read", S_IWUSR | S_IRUGO,
nfsd_top_dir, NULL, &nfsd_dsr_fops);
}
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