Commit | Line | Data |
---|---|---|
3a4a38e6 DH |
1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Object lifetime handling and tracing. | |
3 | * | |
4 | * Copyright (C) 2022 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
6 | */ | |
7 | ||
8 | #include <linux/slab.h> | |
9 | #include "internal.h" | |
10 | ||
11 | /* | |
12 | * Allocate an I/O request and initialise it. | |
13 | */ | |
663dfb65 DH |
14 | struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, |
15 | struct file *file, | |
663dfb65 DH |
16 | loff_t start, size_t len, |
17 | enum netfs_io_origin origin) | |
3a4a38e6 DH |
18 | { |
19 | static atomic_t debug_ids; | |
bc899ee1 | 20 | struct inode *inode = file ? file_inode(file) : mapping->host; |
874c8ca1 | 21 | struct netfs_inode *ctx = netfs_inode(inode); |
3a4a38e6 | 22 | struct netfs_io_request *rreq; |
2de16041 | 23 | int ret; |
3a4a38e6 DH |
24 | |
25 | rreq = kzalloc(sizeof(struct netfs_io_request), GFP_KERNEL); | |
2de16041 DH |
26 | if (!rreq) |
27 | return ERR_PTR(-ENOMEM); | |
28 | ||
29 | rreq->start = start; | |
30 | rreq->len = len; | |
31 | rreq->origin = origin; | |
bc899ee1 | 32 | rreq->netfs_ops = ctx->ops; |
2de16041 | 33 | rreq->mapping = mapping; |
bc899ee1 DH |
34 | rreq->inode = inode; |
35 | rreq->i_size = i_size_read(inode); | |
2de16041 DH |
36 | rreq->debug_id = atomic_inc_return(&debug_ids); |
37 | INIT_LIST_HEAD(&rreq->subrequests); | |
2de16041 DH |
38 | refcount_set(&rreq->ref, 1); |
39 | __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags); | |
40 | if (rreq->netfs_ops->init_request) { | |
41 | ret = rreq->netfs_ops->init_request(rreq, file); | |
42 | if (ret < 0) { | |
43 | kfree(rreq); | |
44 | return ERR_PTR(ret); | |
45 | } | |
3a4a38e6 DH |
46 | } |
47 | ||
2de16041 | 48 | netfs_stat(&netfs_n_rh_rreq); |
3a4a38e6 DH |
49 | return rreq; |
50 | } | |
51 | ||
de74023b | 52 | void netfs_get_request(struct netfs_io_request *rreq, enum netfs_rreq_ref_trace what) |
3a4a38e6 | 53 | { |
de74023b DH |
54 | int r; |
55 | ||
56 | __refcount_inc(&rreq->ref, &r); | |
57 | trace_netfs_rreq_ref(rreq->debug_id, r + 1, what); | |
3a4a38e6 DH |
58 | } |
59 | ||
60 | void netfs_clear_subrequests(struct netfs_io_request *rreq, bool was_async) | |
61 | { | |
62 | struct netfs_io_subrequest *subreq; | |
63 | ||
64 | while (!list_empty(&rreq->subrequests)) { | |
65 | subreq = list_first_entry(&rreq->subrequests, | |
66 | struct netfs_io_subrequest, rreq_link); | |
67 | list_del(&subreq->rreq_link); | |
6cd3d6fd DH |
68 | netfs_put_subrequest(subreq, was_async, |
69 | netfs_sreq_trace_put_clear); | |
3a4a38e6 DH |
70 | } |
71 | } | |
72 | ||
73 | static void netfs_free_request(struct work_struct *work) | |
74 | { | |
75 | struct netfs_io_request *rreq = | |
76 | container_of(work, struct netfs_io_request, work); | |
bc899ee1 | 77 | |
3a4a38e6 | 78 | trace_netfs_rreq(rreq, netfs_rreq_trace_free); |
40a81101 DH |
79 | netfs_clear_subrequests(rreq, false); |
80 | if (rreq->netfs_ops->free_request) | |
81 | rreq->netfs_ops->free_request(rreq); | |
3a4a38e6 DH |
82 | if (rreq->cache_resources.ops) |
83 | rreq->cache_resources.ops->end_operation(&rreq->cache_resources); | |
84 | kfree(rreq); | |
85 | netfs_stat_d(&netfs_n_rh_rreq); | |
86 | } | |
87 | ||
de74023b DH |
88 | void netfs_put_request(struct netfs_io_request *rreq, bool was_async, |
89 | enum netfs_rreq_ref_trace what) | |
3a4a38e6 | 90 | { |
de74023b DH |
91 | unsigned int debug_id = rreq->debug_id; |
92 | bool dead; | |
93 | int r; | |
94 | ||
95 | dead = __refcount_dec_and_test(&rreq->ref, &r); | |
96 | trace_netfs_rreq_ref(debug_id, r - 1, what); | |
97 | if (dead) { | |
3a4a38e6 DH |
98 | if (was_async) { |
99 | rreq->work.func = netfs_free_request; | |
100 | if (!queue_work(system_unbound_wq, &rreq->work)) | |
101 | BUG(); | |
102 | } else { | |
103 | netfs_free_request(&rreq->work); | |
104 | } | |
105 | } | |
106 | } | |
107 | ||
108 | /* | |
109 | * Allocate and partially initialise an I/O request structure. | |
110 | */ | |
111 | struct netfs_io_subrequest *netfs_alloc_subrequest(struct netfs_io_request *rreq) | |
112 | { | |
113 | struct netfs_io_subrequest *subreq; | |
114 | ||
115 | subreq = kzalloc(sizeof(struct netfs_io_subrequest), GFP_KERNEL); | |
116 | if (subreq) { | |
117 | INIT_LIST_HEAD(&subreq->rreq_link); | |
6cd3d6fd | 118 | refcount_set(&subreq->ref, 2); |
3a4a38e6 | 119 | subreq->rreq = rreq; |
de74023b | 120 | netfs_get_request(rreq, netfs_rreq_trace_get_subreq); |
3a4a38e6 DH |
121 | netfs_stat(&netfs_n_rh_sreq); |
122 | } | |
123 | ||
124 | return subreq; | |
125 | } | |
126 | ||
6cd3d6fd DH |
127 | void netfs_get_subrequest(struct netfs_io_subrequest *subreq, |
128 | enum netfs_sreq_ref_trace what) | |
3a4a38e6 | 129 | { |
6cd3d6fd DH |
130 | int r; |
131 | ||
132 | __refcount_inc(&subreq->ref, &r); | |
133 | trace_netfs_sreq_ref(subreq->rreq->debug_id, subreq->debug_index, r + 1, | |
134 | what); | |
3a4a38e6 DH |
135 | } |
136 | ||
6cd3d6fd DH |
137 | static void netfs_free_subrequest(struct netfs_io_subrequest *subreq, |
138 | bool was_async) | |
3a4a38e6 DH |
139 | { |
140 | struct netfs_io_request *rreq = subreq->rreq; | |
141 | ||
142 | trace_netfs_sreq(subreq, netfs_sreq_trace_free); | |
143 | kfree(subreq); | |
144 | netfs_stat_d(&netfs_n_rh_sreq); | |
de74023b | 145 | netfs_put_request(rreq, was_async, netfs_rreq_trace_put_subreq); |
3a4a38e6 DH |
146 | } |
147 | ||
6cd3d6fd DH |
148 | void netfs_put_subrequest(struct netfs_io_subrequest *subreq, bool was_async, |
149 | enum netfs_sreq_ref_trace what) | |
3a4a38e6 | 150 | { |
6cd3d6fd DH |
151 | unsigned int debug_index = subreq->debug_index; |
152 | unsigned int debug_id = subreq->rreq->debug_id; | |
153 | bool dead; | |
154 | int r; | |
155 | ||
156 | dead = __refcount_dec_and_test(&subreq->ref, &r); | |
157 | trace_netfs_sreq_ref(debug_id, debug_index, r - 1, what); | |
158 | if (dead) | |
159 | netfs_free_subrequest(subreq, was_async); | |
3a4a38e6 | 160 | } |