1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Object lifetime handling and tracing.
4 * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
8 #include <linux/slab.h>
12 * Allocate an I/O request and initialise it.
14 struct netfs_io_request *netfs_alloc_request(struct address_space *mapping,
16 loff_t start, size_t len,
17 enum netfs_io_origin origin)
19 static atomic_t debug_ids;
20 struct inode *inode = file ? file_inode(file) : mapping->host;
21 struct netfs_inode *ctx = netfs_inode(inode);
22 struct netfs_io_request *rreq;
25 rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request),
28 return ERR_PTR(-ENOMEM);
32 rreq->origin = origin;
33 rreq->netfs_ops = ctx->ops;
34 rreq->mapping = mapping;
36 rreq->i_size = i_size_read(inode);
37 rreq->debug_id = atomic_inc_return(&debug_ids);
38 INIT_LIST_HEAD(&rreq->subrequests);
39 refcount_set(&rreq->ref, 1);
40 __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
41 if (rreq->netfs_ops->init_request) {
42 ret = rreq->netfs_ops->init_request(rreq, file);
49 netfs_proc_add_rreq(rreq);
50 netfs_stat(&netfs_n_rh_rreq);
54 void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
58 __refcount_inc(&rreq->ref, &r);
59 trace_netfs_rreq_ref(rreq->debug_id, r + 1, what);
62 void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
64 struct netfs_io_subrequest *subreq;
66 while (!list_empty(&rreq->subrequests)) {
67 subreq = list_first_entry(&rreq->subrequests,
68 struct netfs_io_subrequest, rreq_link);
69 list_del(&subreq->rreq_link);
70 netfs_put_subrequest(subreq, was_async,
71 netfs_sreq_trace_put_clear);
75 static void netfs_free_request(struct work_struct *work)
77 struct netfs_io_request *rreq =
78 container_of(work, struct netfs_io_request, work);
80 trace_netfs_rreq(rreq, netfs_rreq_trace_free);
81 netfs_proc_del_rreq(rreq);
82 netfs_clear_subrequests(rreq, false);
83 if (rreq->netfs_ops->free_request)
84 rreq->netfs_ops->free_request(rreq);
85 if (rreq->cache_resources.ops)
86 rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
88 netfs_stat_d(&netfs_n_rh_rreq);
91 void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
92 enum netfs_rreq_ref_trace what)
94 unsigned int debug_id = rreq->debug_id;
98 dead = __refcount_dec_and_test(&rreq->ref, &r);
99 trace_netfs_rreq_ref(debug_id, r - 1, what);
102 rreq->work.func = netfs_free_request;
103 if (!queue_work(system_unbound_wq, &rreq->work))
106 netfs_free_request(&rreq->work);
112 * Allocate and partially initialise an I/O request structure.
114 struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)
116 struct netfs_io_subrequest *subreq;
118 subreq = kzalloc(rreq->netfs_ops->io_subrequest_size ?:
119 sizeof(struct netfs_io_subrequest),
122 INIT_LIST_HEAD(&subreq->rreq_link);
123 refcount_set(&subreq->ref, 2);
125 netfs_get_request(rreq, netfs_rreq_trace_get_subreq);
126 netfs_stat(&netfs_n_rh_sreq);
132 void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
133 enum netfs_sreq_ref_trace what)
137 __refcount_inc(&subreq->ref, &r);
138 trace_netfs_sreq_ref(subreq->rreq->debug_id, subreq->debug_index, r + 1,
142 static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
145 struct netfs_io_request *rreq = subreq->rreq;
147 trace_netfs_sreq(subreq, netfs_sreq_trace_free);
148 if (rreq->netfs_ops->free_subrequest)
149 rreq->netfs_ops->free_subrequest(subreq);
151 netfs_stat_d(&netfs_n_rh_sreq);
152 netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
155 void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async,
156 enum netfs_sreq_ref_trace what)
158 unsigned int debug_index = subreq->debug_index;
159 unsigned int debug_id = subreq->rreq->debug_id;
163 dead = __refcount_dec_and_test(&subreq->ref, &r);
164 trace_netfs_sreq_ref(debug_id, debug_index, r - 1, what);
166 netfs_free_subrequest(subreq, was_async);