1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
|
/*
* NVMe I/O command implementation.
* Copyright (c) 2015-2016 HGST, a Western Digital Company.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/blkdev.h>
#include <linux/module.h>
#include "nvmet.h"
int nvmet_bdev_ns_enable(struct nvmet_ns *ns)
{
int ret;
ns->bdev = blkdev_get_by_path(ns->device_path,
FMODE_READ | FMODE_WRITE, NULL);
if (IS_ERR(ns->bdev)) {
ret = PTR_ERR(ns->bdev);
if (ret != -ENOTBLK) {
pr_err("failed to open block device %s: (%ld)\n",
ns->device_path, PTR_ERR(ns->bdev));
}
ns->bdev = NULL;
return ret;
}
ns->size = i_size_read(ns->bdev->bd_inode);
ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
return 0;
}
void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
{
if (ns->bdev) {
blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ);
ns->bdev = NULL;
}
}
static void nvmet_bio_done(struct bio *bio)
{
struct nvmet_req *req = bio->bi_private;
nvmet_req_complete(req,
bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
if (bio != &req->b.inline_bio)
bio_put(bio);
}
static void nvmet_bdev_execute_rw(struct nvmet_req *req)
{
int sg_cnt = req->sg_cnt;
struct bio *bio;
struct scatterlist *sg;
sector_t sector;
blk_qc_t cookie;
int op, op_flags = 0, i;
if (!req->sg_cnt) {
nvmet_req_complete(req, 0);
return;
}
if (req->cmd->rw.opcode == nvme_cmd_write) {
op = REQ_OP_WRITE;
op_flags = REQ_SYNC | REQ_IDLE;
if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
op_flags |= REQ_FUA;
} else {
op = REQ_OP_READ;
}
sector = le64_to_cpu(req->cmd->rw.slba);
sector <<= (req->ns->blksize_shift - 9);
if (req->data_len <= NVMET_MAX_INLINE_DATA_LEN) {
bio = &req->b.inline_bio;
bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
} else {
bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
}
bio_set_dev(bio, req->ns->bdev);
bio->bi_iter.bi_sector = sector;
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
bio_set_op_attrs(bio, op, op_flags);
for_each_sg(req->sg, sg, req->sg_cnt, i) {
while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
!= sg->length) {
struct bio *prev = bio;
bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
bio_set_dev(bio, req->ns->bdev);
bio->bi_iter.bi_sector = sector;
bio_set_op_attrs(bio, op, op_flags);
bio_chain(bio, prev);
submit_bio(prev);
}
sector += sg->length >> 9;
sg_cnt--;
}
cookie = submit_bio(bio);
blk_poll(bdev_get_queue(req->ns->bdev), cookie);
}
static void nvmet_bdev_execute_flush(struct nvmet_req *req)
{
struct bio *bio = &req->b.inline_bio;
bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
bio_set_dev(bio, req->ns->bdev);
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
submit_bio(bio);
}
u16 nvmet_bdev_flush(struct nvmet_req *req)
{
if (blkdev_issue_flush(req->ns->bdev, GFP_KERNEL, NULL))
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
}
static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns,
struct nvme_dsm_range *range, struct bio **bio)
{
int ret;
ret = __blkdev_issue_discard(ns->bdev,
le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
GFP_KERNEL, 0, bio);
if (ret && ret != -EOPNOTSUPP)
return NVME_SC_INTERNAL | NVME_SC_DNR;
return 0;
}
static void nvmet_bdev_execute_discard(struct nvmet_req *req)
{
struct nvme_dsm_range range;
struct bio *bio = NULL;
int i;
u16 status;
for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
sizeof(range));
if (status)
break;
status = nvmet_bdev_discard_range(req->ns, &range, &bio);
if (status)
break;
}
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
if (status) {
bio->bi_status = BLK_STS_IOERR;
bio_endio(bio);
} else {
submit_bio(bio);
}
} else {
nvmet_req_complete(req, status);
}
}
static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
{
switch (le32_to_cpu(req->cmd->dsm.attributes)) {
case NVME_DSMGMT_AD:
nvmet_bdev_execute_discard(req);
return;
case NVME_DSMGMT_IDR:
case NVME_DSMGMT_IDW:
default:
/* Not supported yet */
nvmet_req_complete(req, 0);
return;
}
}
static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
{
struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
struct bio *bio = NULL;
u16 status = NVME_SC_SUCCESS;
sector_t sector;
sector_t nr_sector;
sector = le64_to_cpu(write_zeroes->slba) <<
(req->ns->blksize_shift - 9);
nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
(req->ns->blksize_shift - 9));
if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
GFP_KERNEL, &bio, 0))
status = NVME_SC_INTERNAL | NVME_SC_DNR;
if (bio) {
bio->bi_private = req;
bio->bi_end_io = nvmet_bio_done;
submit_bio(bio);
} else {
nvmet_req_complete(req, status);
}
}
u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
{
struct nvme_command *cmd = req->cmd;
switch (cmd->common.opcode) {
case nvme_cmd_read:
case nvme_cmd_write:
req->execute = nvmet_bdev_execute_rw;
req->data_len = nvmet_rw_len(req);
return 0;
case nvme_cmd_flush:
req->execute = nvmet_bdev_execute_flush;
req->data_len = 0;
return 0;
case nvme_cmd_dsm:
req->execute = nvmet_bdev_execute_dsm;
req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
sizeof(struct nvme_dsm_range);
return 0;
case nvme_cmd_write_zeroes:
req->execute = nvmet_bdev_execute_write_zeroes;
return 0;
default:
pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
req->sq->qid);
return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
}
}
|
