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
 16static struct kmem_cache *work_cache;
 17static struct workqueue_struct *ksmbd_wq;
 18
 19struct 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
 42void 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
 67void ksmbd_work_pool_destroy(void)
 68{
 69	kmem_cache_destroy(work_cache);
 70}
 71
 72int 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
 82int 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
 90void ksmbd_workqueue_destroy(void)
 91{
 92	destroy_workqueue(ksmbd_wq);
 93	ksmbd_wq = NULL;
 94}
 95
 96bool ksmbd_queue_work(struct ksmbd_work *work)
 97{
 98	return queue_work(ksmbd_wq, &work->work);
 99}
100
101static 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
109static 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
159int 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
164int 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
170int 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}