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 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 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 64 void ksmbd_work_pool_destroy(void) 65 { 66 kmem_cache_destroy(work_cache); 67 } 68 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 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 87 void ksmbd_workqueue_destroy(void) 88 { 89 destroy_workqueue(ksmbd_wq); 90 ksmbd_wq = NULL; 91 } 92 93 bool ksmbd_queue_work(struct ksmbd_work *work) 94 { 95 return queue_work(ksmbd_wq, &work->work); 96 } 97 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 } 120 121 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 } 151 152 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 } 156 157 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 } 162 163 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