1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2019 Samsung Electronics Co., Ltd.
4 */
5
6 #include <linux/list.h>
7 #include <linux/mm.h>
8 #include <linux/slab.h>
9 #include <linux/workqueue.h>
10
11 #include "server.h"
12 #include "connection.h"
13 #include "ksmbd_work.h"
14 #include "mgmt/ksmbd_ida.h"
15
16 static struct kmem_cache *work_cache;
17 static struct workqueue_struct *ksmbd_wq;
18
ksmbd_alloc_work_struct(void)19 struct ksmbd_work *ksmbd_alloc_work_struct(void)
20 {
21 struct ksmbd_work *work = kmem_cache_zalloc(work_cache, GFP_KERNEL);
22
23 if (work) {
24 work->compound_fid = KSMBD_NO_FID;
25 work->compound_pfid = KSMBD_NO_FID;
26 INIT_LIST_HEAD(&work->request_entry);
27 INIT_LIST_HEAD(&work->async_request_entry);
28 INIT_LIST_HEAD(&work->fp_entry);
29 INIT_LIST_HEAD(&work->interim_entry);
30 INIT_LIST_HEAD(&work->aux_read_list);
31 work->iov_alloc_cnt = 4;
32 work->iov = kcalloc(work->iov_alloc_cnt, sizeof(struct kvec),
33 GFP_KERNEL);
34 if (!work->iov) {
35 kmem_cache_free(work_cache, work);
36 work = NULL;
37 }
38 }
39 return work;
40 }
41
ksmbd_free_work_struct(struct ksmbd_work * work)42 void ksmbd_free_work_struct(struct ksmbd_work *work)
43 {
44 struct aux_read *ar, *tmp;
45
46 WARN_ON(work->saved_cred != NULL);
47
48 kvfree(work->response_buf);
49
50 list_for_each_entry_safe(ar, tmp, &work->aux_read_list, entry) {
51 kvfree(ar->buf);
52 list_del(&ar->entry);
53 kfree(ar);
54 }
55
56 kfree(work->tr_buf);
57 kvfree(work->request_buf);
58 kfree(work->iov);
59 if (work->async_id)
60 ksmbd_release_id(&work->conn->async_ida, work->async_id);
61 kmem_cache_free(work_cache, work);
62 }
63
ksmbd_work_pool_destroy(void)64 void ksmbd_work_pool_destroy(void)
65 {
66 kmem_cache_destroy(work_cache);
67 }
68
ksmbd_work_pool_init(void)69 int ksmbd_work_pool_init(void)
70 {
71 work_cache = kmem_cache_create("ksmbd_work_cache",
72 sizeof(struct ksmbd_work), 0,
73 SLAB_HWCACHE_ALIGN, NULL);
74 if (!work_cache)
75 return -ENOMEM;
76 return 0;
77 }
78
ksmbd_workqueue_init(void)79 int ksmbd_workqueue_init(void)
80 {
81 ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0);
82 if (!ksmbd_wq)
83 return -ENOMEM;
84 return 0;
85 }
86
ksmbd_workqueue_destroy(void)87 void ksmbd_workqueue_destroy(void)
88 {
89 destroy_workqueue(ksmbd_wq);
90 ksmbd_wq = NULL;
91 }
92
ksmbd_queue_work(struct ksmbd_work * work)93 bool ksmbd_queue_work(struct ksmbd_work *work)
94 {
95 return queue_work(ksmbd_wq, &work->work);
96 }
97
ksmbd_realloc_iov_pin(struct ksmbd_work * work,void * ib,unsigned int ib_len)98 static int ksmbd_realloc_iov_pin(struct ksmbd_work *work, void *ib,
99 unsigned int ib_len)
100 {
101
102 if (work->iov_alloc_cnt <= work->iov_cnt) {
103 struct kvec *new;
104
105 work->iov_alloc_cnt += 4;
106 new = krealloc(work->iov,
107 sizeof(struct kvec) * work->iov_alloc_cnt,
108 GFP_KERNEL | __GFP_ZERO);
109 if (!new)
110 return -ENOMEM;
111 work->iov = new;
112 }
113
114 work->iov[++work->iov_idx].iov_base = ib;
115 work->iov[work->iov_idx].iov_len = ib_len;
116 work->iov_cnt++;
117
118 return 0;
119 }
120
__ksmbd_iov_pin_rsp(struct ksmbd_work * work,void * ib,int len,void * aux_buf,unsigned int aux_size)121 static int __ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len,
122 void *aux_buf, unsigned int aux_size)
123 {
124 /* Plus rfc_length size on first iov */
125 if (!work->iov_idx) {
126 work->iov[work->iov_idx].iov_base = work->response_buf;
127 *(__be32 *)work->iov[0].iov_base = 0;
128 work->iov[work->iov_idx].iov_len = 4;
129 work->iov_cnt++;
130 }
131
132 ksmbd_realloc_iov_pin(work, ib, len);
133 inc_rfc1001_len(work->iov[0].iov_base, len);
134
135 if (aux_size) {
136 struct aux_read *ar;
137
138 ksmbd_realloc_iov_pin(work, aux_buf, aux_size);
139 inc_rfc1001_len(work->iov[0].iov_base, aux_size);
140
141 ar = kmalloc(sizeof(struct aux_read), GFP_KERNEL);
142 if (!ar)
143 return -ENOMEM;
144
145 ar->buf = aux_buf;
146 list_add(&ar->entry, &work->aux_read_list);
147 }
148
149 return 0;
150 }
151
ksmbd_iov_pin_rsp(struct ksmbd_work * work,void * ib,int len)152 int ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len)
153 {
154 return __ksmbd_iov_pin_rsp(work, ib, len, NULL, 0);
155 }
156
ksmbd_iov_pin_rsp_read(struct ksmbd_work * work,void * ib,int len,void * aux_buf,unsigned int aux_size)157 int ksmbd_iov_pin_rsp_read(struct ksmbd_work *work, void *ib, int len,
158 void *aux_buf, unsigned int aux_size)
159 {
160 return __ksmbd_iov_pin_rsp(work, ib, len, aux_buf, aux_size);
161 }
162
allocate_interim_rsp_buf(struct ksmbd_work * work)163 int allocate_interim_rsp_buf(struct ksmbd_work *work)
164 {
165 work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
166 if (!work->response_buf)
167 return -ENOMEM;
168 work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
169 return 0;
170 }
171
