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;
23 bool cached = netfs_is_cache_enabled(ctx);
26 rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request),
29 return ERR_PTR(-ENOMEM);
33 rreq->origin = origin;
34 rreq->netfs_ops = ctx->ops;
35 rreq->mapping = mapping;
37 rreq->i_size = i_size_read(inode);
38 rreq->debug_id = atomic_inc_return(&debug_ids);
39 INIT_LIST_HEAD(&rreq->subrequests);
40 refcount_set(&rreq->ref, 1);
42 __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
44 __set_bit(NETFS_RREQ_WRITE_TO_CACHE, &rreq->flags);
45 if (rreq->netfs_ops->init_request) {
46 ret = rreq->netfs_ops->init_request(rreq, file);
53 trace_netfs_rreq_ref(rreq->debug_id, 1, netfs_rreq_trace_new);
54 netfs_proc_add_rreq(rreq);
55 netfs_stat(&netfs_n_rh_rreq);
59 void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
63 __refcount_inc(&rreq->ref, &r);
64 trace_netfs_rreq_ref(rreq->debug_id, r + 1, what);
67 void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
69 struct netfs_io_subrequest *subreq;
71 while (!list_empty(&rreq->subrequests)) {
72 subreq = list_first_entry(&rreq->subrequests,
73 struct netfs_io_subrequest, rreq_link);
74 list_del(&subreq->rreq_link);
75 netfs_put_subrequest(subreq, was_async,
76 netfs_sreq_trace_put_clear);
80 static void netfs_free_request(struct work_struct *work)
82 struct netfs_io_request *rreq =
83 container_of(work, struct netfs_io_request, work);
86 trace_netfs_rreq(rreq, netfs_rreq_trace_free);
87 netfs_proc_del_rreq(rreq);
88 netfs_clear_subrequests(rreq, false);
89 if (rreq->netfs_ops->free_request)
90 rreq->netfs_ops->free_request(rreq);
91 if (rreq->cache_resources.ops)
92 rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
93 if (rreq->direct_bv) {
94 for (i = 0; i < rreq->direct_bv_count; i++) {
95 if (rreq->direct_bv[i].bv_page) {
96 if (rreq->direct_bv_unpin)
97 unpin_user_page(rreq->direct_bv[i].bv_page);
100 kvfree(rreq->direct_bv);
102 kfree_rcu(rreq, rcu);
103 netfs_stat_d(&netfs_n_rh_rreq);
106 void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
107 enum netfs_rreq_ref_trace what)
109 unsigned int debug_id;
114 debug_id = rreq->debug_id;
115 dead = __refcount_dec_and_test(&rreq->ref, &r);
116 trace_netfs_rreq_ref(debug_id, r - 1, what);
119 rreq->work.func = netfs_free_request;
120 if (!queue_work(system_unbound_wq, &rreq->work))
123 netfs_free_request(&rreq->work);
130 * Allocate and partially initialise an I/O request structure.
132 struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)
134 struct netfs_io_subrequest *subreq;
136 subreq = kzalloc(rreq->netfs_ops->io_subrequest_size ?:
137 sizeof(struct netfs_io_subrequest),
140 INIT_WORK(&subreq->work, NULL);
141 INIT_LIST_HEAD(&subreq->rreq_link);
142 refcount_set(&subreq->ref, 2);
144 netfs_get_request(rreq, netfs_rreq_trace_get_subreq);
145 netfs_stat(&netfs_n_rh_sreq);
151 void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
152 enum netfs_sreq_ref_trace what)
156 __refcount_inc(&subreq->ref, &r);
157 trace_netfs_sreq_ref(subreq->rreq->debug_id, subreq->debug_index, r + 1,
161 static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
164 struct netfs_io_request *rreq = subreq->rreq;
166 trace_netfs_sreq(subreq, netfs_sreq_trace_free);
167 if (rreq->netfs_ops->free_subrequest)
168 rreq->netfs_ops->free_subrequest(subreq);
170 netfs_stat_d(&netfs_n_rh_sreq);
171 netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
174 void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async,
175 enum netfs_sreq_ref_trace what)
177 unsigned int debug_index = subreq->debug_index;
178 unsigned int debug_id = subreq->rreq->debug_id;
182 dead = __refcount_dec_and_test(&subreq->ref, &r);
183 trace_netfs_sreq_ref(debug_id, debug_index, r - 1, what);
185 netfs_free_subrequest(subreq, was_async);