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// SPDX-License-Identifier: GPL-2.0-only
/* Object lifetime handling and tracing.
*
* Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*/
#include <linux/slab.h>
#include "internal.h"
/*
* Allocate an I/O request and initialise it.
*/
struct netfs_io_request *netfs_alloc_request(
const struct netfs_request_ops *ops, void *netfs_priv,
struct file *file)
{
static atomic_t debug_ids;
struct netfs_io_request *rreq;
rreq = kzalloc(sizeof(struct netfs_io_request), GFP_KERNEL);
if (rreq) {
rreq->netfs_ops = ops;
rreq->netfs_priv = netfs_priv;
rreq->inode = file_inode(file);
rreq->i_size = i_size_read(rreq->inode);
rreq->debug_id = atomic_inc_return(&debug_ids);
INIT_LIST_HEAD(&rreq->subrequests);
INIT_WORK(&rreq->work, netfs_rreq_work);
refcount_set(&rreq->usage, 1);
__set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
if (ops->init_request)
ops->init_request(rreq, file);
netfs_stat(&netfs_n_rh_rreq);
}
return rreq;
}
void netfs_get_request(struct netfs_io_request *rreq)
{
refcount_inc(&rreq->usage);
}
void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
{
struct netfs_io_subrequest *subreq;
while (!list_empty(&rreq->subrequests)) {
subreq = list_first_entry(&rreq->subrequests,
struct netfs_io_subrequest, rreq_link);
list_del(&subreq->rreq_link);
netfs_put_subrequest(subreq, was_async);
}
}
static void netfs_free_request(struct work_struct *work)
{
struct netfs_io_request *rreq =
container_of(work, struct netfs_io_request, work);
netfs_clear_subrequests(rreq, false);
if (rreq->netfs_priv)
rreq->netfs_ops->cleanup(rreq->mapping, rreq->netfs_priv);
trace_netfs_rreq(rreq, netfs_rreq_trace_free);
if (rreq->cache_resources.ops)
rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
kfree(rreq);
netfs_stat_d(&netfs_n_rh_rreq);
}
void netfs_put_request(struct netfs_io_request *rreq, bool was_async)
{
if (refcount_dec_and_test(&rreq->usage)) {
if (was_async) {
rreq->work.func = netfs_free_request;
if (!queue_work(system_unbound_wq, &rreq->work))
BUG();
} else {
netfs_free_request(&rreq->work);
}
}
}
/*
* Allocate and partially initialise an I/O request structure.
*/
struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)
{
struct netfs_io_subrequest *subreq;
subreq = kzalloc(sizeof(struct netfs_io_subrequest), GFP_KERNEL);
if (subreq) {
INIT_LIST_HEAD(&subreq->rreq_link);
refcount_set(&subreq->usage, 2);
subreq->rreq = rreq;
netfs_get_request(rreq);
netfs_stat(&netfs_n_rh_sreq);
}
return subreq;
}
void netfs_get_subrequest(struct netfs_io_subrequest *subreq)
{
refcount_inc(&subreq->usage);
}
static void __netfs_put_subrequest(struct netfs_io_subrequest *subreq,
bool was_async)
{
struct netfs_io_request *rreq = subreq->rreq;
trace_netfs_sreq(subreq, netfs_sreq_trace_free);
kfree(subreq);
netfs_stat_d(&netfs_n_rh_sreq);
netfs_put_request(rreq, was_async);
}
void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async)
{
if (refcount_dec_and_test(&subreq->usage))
__netfs_put_subrequest(subreq, was_async);
}
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