linux/fs/netfs/fscache_io.c

// SPDX-License-Identifier: GPL-2.0-or-later
/* Cache data I/O routines
 *
 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells ([email protected])
 */
#define FSCACHE_DEBUG_LEVEL …
#include <linux/fscache-cache.h>
#include <linux/uio.h>
#include <linux/bvec.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include "internal.h"

/**
 * fscache_wait_for_operation - Wait for an object become accessible
 * @cres: The cache resources for the operation being performed
 * @want_state: The minimum state the object must be at
 *
 * See if the target cache object is at the specified minimum state of
 * accessibility yet, and if not, wait for it.
 */
bool fscache_wait_for_operation(struct netfs_cache_resources *cres,
				enum fscache_want_state want_state)
{ … }
EXPORT_SYMBOL(…);

/*
 * Begin an I/O operation on the cache, waiting till we reach the right state.
 *
 * Attaches the resources required to the operation resources record.
 */
static int fscache_begin_operation(struct netfs_cache_resources *cres,
				   struct fscache_cookie *cookie,
				   enum fscache_want_state want_state,
				   enum fscache_access_trace why)
{ … }

int __fscache_begin_read_operation(struct netfs_cache_resources *cres,
				   struct fscache_cookie *cookie)
{ … }
EXPORT_SYMBOL(…);

int __fscache_begin_write_operation(struct netfs_cache_resources *cres,
				    struct fscache_cookie *cookie)
{ … }
EXPORT_SYMBOL(…);

struct fscache_write_request { … };

void __fscache_clear_page_bits(struct address_space *mapping,
			       loff_t start, size_t len)
{ … }
EXPORT_SYMBOL(…);

/*
 * Deal with the completion of writing the data to the cache.
 */
static void fscache_wreq_done(void *priv, ssize_t transferred_or_error,
			      bool was_async)
{ … }

void __fscache_write_to_cache(struct fscache_cookie *cookie,
			      struct address_space *mapping,
			      loff_t start, size_t len, loff_t i_size,
			      netfs_io_terminated_t term_func,
			      void *term_func_priv,
			      bool using_pgpriv2, bool cond)
{ … }
EXPORT_SYMBOL(…);

/*
 * Change the size of a backing object.
 */
void __fscache_resize_cookie(struct fscache_cookie *cookie, loff_t new_size)
{ … }
EXPORT_SYMBOL(…);