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 (!list_empty(&work->interim_entry))
60 list_del(&work->interim_entry);
61
62 if (work->async_id)
63 ksmbd_release_id(&work->conn->async_ida, work->async_id);
64 kmem_cache_free(work_cache, work);
65 }
66
ksmbd_work_pool_destroy(void)67 void ksmbd_work_pool_destroy(void)
68 {
69 kmem_cache_destroy(work_cache);
70 }
71
ksmbd_work_pool_init(void)72 int ksmbd_work_pool_init(void)
73 {
74 work_cache = kmem_cache_create("ksmbd_work_cache",
75 sizeof(struct ksmbd_work), 0,
76 SLAB_HWCACHE_ALIGN, NULL);
77 if (!work_cache)
78 return -ENOMEM;
79 return 0;
80 }
81
ksmbd_workqueue_init(void)82 int ksmbd_workqueue_init(void)
83 {
84 ksmbd_wq = alloc_workqueue("ksmbd-io", 0, 0);
85 if (!ksmbd_wq)
86 return -ENOMEM;
87 return 0;
88 }
89
ksmbd_workqueue_destroy(void)90 void ksmbd_workqueue_destroy(void)
91 {
92 destroy_workqueue(ksmbd_wq);
93 ksmbd_wq = NULL;
94 }
95
ksmbd_queue_work(struct ksmbd_work * work)96 bool ksmbd_queue_work(struct ksmbd_work *work)
97 {
98 return queue_work(ksmbd_wq, &work->work);
99 }
100
__ksmbd_iov_pin(struct ksmbd_work * work,void * ib,unsigned int ib_len)101 static inline void __ksmbd_iov_pin(struct ksmbd_work *work, void *ib,
102 unsigned int ib_len)
103 {
104 work->iov[++work->iov_idx].iov_base = ib;
105 work->iov[work->iov_idx].iov_len = ib_len;
106 work->iov_cnt++;
107 }
108
__ksmbd_iov_pin_rsp(struct ksmbd_work * work,void * ib,int len,void * aux_buf,unsigned int aux_size)109 static int __ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len,
110 void *aux_buf, unsigned int aux_size)
111 {
112 struct aux_read *ar = NULL;
113 int need_iov_cnt = 1;
114
115 if (aux_size) {
116 need_iov_cnt++;
117 ar = kmalloc(sizeof(struct aux_read), GFP_KERNEL);
118 if (!ar)
119 return -ENOMEM;
120 }
121
122 if (work->iov_alloc_cnt < work->iov_cnt + need_iov_cnt) {
123 struct kvec *new;
124
125 work->iov_alloc_cnt += 4;
126 new = krealloc(work->iov,
127 sizeof(struct kvec) * work->iov_alloc_cnt,
128 GFP_KERNEL | __GFP_ZERO);
129 if (!new) {
130 kfree(ar);
131 work->iov_alloc_cnt -= 4;
132 return -ENOMEM;
133 }
134 work->iov = new;
135 }
136
137 /* Plus rfc_length size on first iov */
138 if (!work->iov_idx) {
139 work->iov[work->iov_idx].iov_base = work->response_buf;
140 *(__be32 *)work->iov[0].iov_base = 0;
141 work->iov[work->iov_idx].iov_len = 4;
142 work->iov_cnt++;
143 }
144
145 __ksmbd_iov_pin(work, ib, len);
146 inc_rfc1001_len(work->iov[0].iov_base, len);
147
148 if (aux_size) {
149 __ksmbd_iov_pin(work, aux_buf, aux_size);
150 inc_rfc1001_len(work->iov[0].iov_base, aux_size);
151
152 ar->buf = aux_buf;
153 list_add(&ar->entry, &work->aux_read_list);
154 }
155
156 return 0;
157 }
158
ksmbd_iov_pin_rsp(struct ksmbd_work * work,void * ib,int len)159 int ksmbd_iov_pin_rsp(struct ksmbd_work *work, void *ib, int len)
160 {
161 return __ksmbd_iov_pin_rsp(work, ib, len, NULL, 0);
162 }
163
ksmbd_iov_pin_rsp_read(struct ksmbd_work * work,void * ib,int len,void * aux_buf,unsigned int aux_size)164 int ksmbd_iov_pin_rsp_read(struct ksmbd_work *work, void *ib, int len,
165 void *aux_buf, unsigned int aux_size)
166 {
167 return __ksmbd_iov_pin_rsp(work, ib, len, aux_buf, aux_size);
168 }
169
allocate_interim_rsp_buf(struct ksmbd_work * work)170 int allocate_interim_rsp_buf(struct ksmbd_work *work)
171 {
172 work->response_buf = kzalloc(MAX_CIFS_SMALL_BUFFER_SIZE, GFP_KERNEL);
173 if (!work->response_buf)
174 return -ENOMEM;
175 work->response_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
176 return 0;
177 }
178