linux/fs/netfs/fscache_main.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* General filesystem local caching manager
 *
 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */

#define FSCACHE_DEBUG_LEVEL …
#include <linux/module.h>
#include <linux/init.h>
#include "internal.h"
#define CREATE_TRACE_POINTS
#include <trace/events/fscache.h>

EXPORT_TRACEPOINT_SYMBOL(…);
EXPORT_TRACEPOINT_SYMBOL(…);
EXPORT_TRACEPOINT_SYMBOL(…);

struct workqueue_struct *fscache_wq;
EXPORT_SYMBOL(…);

/*
 * Mixing scores (in bits) for (7,20):
 * Input delta: 1-bit      2-bit
 * 1 round:     330.3     9201.6
 * 2 rounds:   1246.4    25475.4
 * 3 rounds:   1907.1    31295.1
 * 4 rounds:   2042.3    31718.6
 * Perfect:    2048      31744
 *            (32*64)   (32*31/2 * 64)
 */
#define HASH_MIX(x, y, a) …

static inline unsigned int fold_hash(unsigned long x, unsigned long y)
{ … }

/*
 * Generate a hash.  This is derived from full_name_hash(), but we want to be
 * sure it is arch independent and that it doesn't change as bits of the
 * computed hash value might appear on disk.  The caller must guarantee that
 * the source data is a multiple of four bytes in size.
 */
unsigned int fscache_hash(unsigned int salt, const void *data, size_t len)
{ … }

/*
 * initialise the fs caching module
 */
int __init fscache_init(void)
{ … }

/*
 * clean up on module removal
 */
void __exit fscache_exit(void)
{ … }