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// SPDX-License-Identifier: GPL-2.0-or-later
/* kiocb-using read/write
*
* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/uio.h>
#include <linux/falloc.h>
#include <linux/sched/mm.h>
#include <trace/events/fscache.h>
#include "internal.h"
/*
* Clean up an operation.
*/
static void cachefiles_end_operation(struct netfs_cache_resources *cres)
{
struct file *file = cachefiles_cres_file(cres);
if (file)
fput(file);
fscache_end_cookie_access(fscache_cres_cookie(cres), fscache_access_io_end);
}
static const struct netfs_cache_ops cachefiles_netfs_cache_ops = {
.end_operation = cachefiles_end_operation,
};
/*
* Open the cache file when beginning a cache operation.
*/
bool cachefiles_begin_operation(struct netfs_cache_resources *cres,
enum fscache_want_state want_state)
{
struct cachefiles_object *object = cachefiles_cres_object(cres);
if (!cachefiles_cres_file(cres)) {
cres->ops = &cachefiles_netfs_cache_ops;
if (object->file) {
spin_lock(&object->lock);
if (!cres->cache_priv2 && object->file)
cres->cache_priv2 = get_file(object->file);
spin_unlock(&object->lock);
}
}
if (!cachefiles_cres_file(cres) && want_state != FSCACHE_WANT_PARAMS) {
pr_err("failed to get cres->file\n");
return false;
}
return true;
}
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