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