// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/fs/nfs/pagelist.c
*
* A set of helper functions for managing NFS read and write requests.
* The main purpose of these routines is to provide support for the
* coalescing of several requests into a single RPC call.
*
* Copyright 2000, 2001 (c) Trond Myklebust <trond.myklebust@fys.uio.no>
*
*/
#include <linux/slab.h>
#include <linux/file.h>
#include <linux/sched.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_page.h>
#include <linux/nfs_mount.h>
#include <linux/export.h>
#include "internal.h"
#include "pnfs.h"
#include "nfstrace.h"
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static struct kmem_cache *nfs_page_cachep;
static const struct rpc_call_ops nfs_pgio_common_ops;
static struct nfs_pgio_mirror *
nfs_pgio_get_mirror(struct nfs_pageio_descriptor *desc, u32 idx)
{
if (desc->pg_ops->pg_get_mirror)
return desc->pg_ops->pg_get_mirror(desc, idx);
return &desc->pg_mirrors[0];
}
struct nfs_pgio_mirror *
nfs_pgio_current_mirror(struct nfs_pageio_descriptor *desc)
{
return nfs_pgio_get_mirror(desc, desc->pg_mirror_idx);
}
EXPORT_SYMBOL_GPL(nfs_pgio_current_mirror);
static u32
nfs_pgio_set_current_mirror(struct nfs_pageio_descriptor *desc, u32 idx)
{
if (desc->pg_ops->pg_set_mirror)
return desc->pg_ops->pg_set_mirror(desc, idx);
return 