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 is_unbuffered = (origin == NETFS_UNBUFFERED_WRITE ||
24 origin == NETFS_DIO_READ ||
25 origin == NETFS_DIO_WRITE);
26 bool cached = !is_unbuffered && netfs_is_cache_enabled(ctx);
29 rreq = kzalloc(ctx->ops->io_request_size ?: sizeof(struct netfs_io_request),
32 return ERR_PTR(-ENOMEM);
36 rreq->upper_len = len;
37 rreq->origin = origin;
38 rreq->netfs_ops = ctx->ops;
39 rreq->mapping = mapping;
41 rreq->i_size = i_size_read(inode);
42 rreq->debug_id = atomic_inc_return(&debug_ids);
43 INIT_LIST_HEAD(&rreq->subrequests);
44 INIT_WORK(&rreq->work, NULL);
45 refcount_set(&rreq->ref, 1);
47 __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags);
49 __set_bit(NETFS_RREQ_WRITE_TO_CACHE, &rreq->flags);
50 if (file && file->f_flags & O_NONBLOCK)
51 __set_bit(NETFS_RREQ_NONBLOCK, &rreq->flags);
52 if (rreq->netfs_ops->init_request) {
53 ret = rreq->netfs_ops->init_request(rreq, file);
60 trace_netfs_rreq_ref(rreq->debug_id, 1, netfs_rreq_trace_new);
61 netfs_proc_add_rreq(rreq);
62 netfs_stat(&netfs_n_rh_rreq);
66 void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what)
70 __refcount_inc(&rreq->ref, &r);
71 trace_netfs_rreq_ref(rreq->debug_id, r + 1, what);
74 void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async)
76 struct netfs_io_subrequest *subreq;
78 while (!list_empty(&rreq->subrequests)) {
79 subreq = list_first_entry(&rreq->subrequests,
80 struct netfs_io_subrequest, rreq_link);
81 list_del(&subreq->rreq_link);
82 netfs_put_subrequest(subreq, was_async,
83 netfs_sreq_trace_put_clear);
87 static void netfs_free_request(struct work_struct *work)
89 struct netfs_io_request *rreq =
90 container_of(work, struct netfs_io_request, work);
93 trace_netfs_rreq(rreq, netfs_rreq_trace_free);
94 netfs_proc_del_rreq(rreq);
95 netfs_clear_subrequests(rreq, false);
96 if (rreq->netfs_ops->free_request)
97 rreq->netfs_ops->free_request(rreq);
98 if (rreq->cache_resources.ops)
99 rreq->cache_resources.ops->end_operation(&rreq->cache_resources);
100 if (rreq->direct_bv) {
101 for (i = 0; i < rreq->direct_bv_count; i++) {
102 if (rreq->direct_bv[i].bv_page) {
103 if (rreq->direct_bv_unpin)
104 unpin_user_page(rreq->direct_bv[i].bv_page);
107 kvfree(rreq->direct_bv);
109 kfree_rcu(rreq, rcu);
110 netfs_stat_d(&netfs_n_rh_rreq);
113 void netfs_put_request(struct netfs_io_request *rreq, bool was_async,
114 enum netfs_rreq_ref_trace what)
116 unsigned int debug_id;
121 debug_id = rreq->debug_id;
122 dead = __refcount_dec_and_test(&rreq->ref, &r);
123 trace_netfs_rreq_ref(debug_id, r - 1, what);
126 rreq->work.func = netfs_free_request;
127 if (!queue_work(system_unbound_wq, &rreq->work))
130 netfs_free_request(&rreq->work);
137 * Allocate and partially initialise an I/O request structure.
139 struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq)
141 struct netfs_io_subrequest *subreq;
143 subreq = kzalloc(rreq->netfs_ops->io_subrequest_size ?:
144 sizeof(struct netfs_io_subrequest),
147 INIT_WORK(&subreq->work, NULL);
148 INIT_LIST_HEAD(&subreq->rreq_link);
149 refcount_set(&subreq->ref, 2);
151 netfs_get_request(rreq, netfs_rreq_trace_get_subreq);
152 netfs_stat(&netfs_n_rh_sreq);
158 void netfs_get_subrequest(struct netfs_io_subrequest *subreq,
159 enum netfs_sreq_ref_trace what)
163 __refcount_inc(&subreq->ref, &r);
164 trace_netfs_sreq_ref(subreq->rreq->debug_id, subreq->debug_index, r + 1,
168 static void netfs_free_subrequest(struct netfs_io_subrequest *subreq,
171 struct netfs_io_request *rreq = subreq->rreq;
173 trace_netfs_sreq(subreq, netfs_sreq_trace_free);
174 if (rreq->netfs_ops->free_subrequest)
175 rreq->netfs_ops->free_subrequest(subreq);
177 netfs_stat_d(&netfs_n_rh_sreq);
178 netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq);
181 void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async,
182 enum netfs_sreq_ref_trace what)
184 unsigned int debug_index = subreq->debug_index;
185 unsigned int debug_id = subreq->rreq->debug_id;
189 dead = __refcount_dec_and_test(&subreq->ref, &r);
190 trace_netfs_sreq_ref(debug_id, debug_index, r - 1, what);
192 netfs_free_subrequest(subreq, was_async);