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14#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15#include <linux/blkdev.h>
16#include <linux/module.h>
17#include "nvmet.h"
18
19int nvmet_bdev_ns_enable(struct nvmet_ns *ns)
20{
21 int ret;
22
23 ns->bdev = blkdev_get_by_path(ns->device_path,
24 FMODE_READ | FMODE_WRITE, NULL);
25 if (IS_ERR(ns->bdev)) {
26 ret = PTR_ERR(ns->bdev);
27 if (ret != -ENOTBLK) {
28 pr_err("failed to open block device %s: (%ld)\n",
29 ns->device_path, PTR_ERR(ns->bdev));
30 }
31 ns->bdev = NULL;
32 return ret;
33 }
34 ns->size = i_size_read(ns->bdev->bd_inode);
35 ns->blksize_shift = blksize_bits(bdev_logical_block_size(ns->bdev));
36 return 0;
37}
38
39void nvmet_bdev_ns_disable(struct nvmet_ns *ns)
40{
41 if (ns->bdev) {
42 blkdev_put(ns->bdev, FMODE_WRITE | FMODE_READ);
43 ns->bdev = NULL;
44 }
45}
46
47static void nvmet_bio_done(struct bio *bio)
48{
49 struct nvmet_req *req = bio->bi_private;
50
51 nvmet_req_complete(req,
52 bio->bi_status ? NVME_SC_INTERNAL | NVME_SC_DNR : 0);
53
54 if (bio != &req->b.inline_bio)
55 bio_put(bio);
56}
57
58static void nvmet_bdev_execute_rw(struct nvmet_req *req)
59{
60 int sg_cnt = req->sg_cnt;
61 struct bio *bio = &req->b.inline_bio;
62 struct scatterlist *sg;
63 sector_t sector;
64 blk_qc_t cookie;
65 int op, op_flags = 0, i;
66
67 if (!req->sg_cnt) {
68 nvmet_req_complete(req, 0);
69 return;
70 }
71
72 if (req->cmd->rw.opcode == nvme_cmd_write) {
73 op = REQ_OP_WRITE;
74 op_flags = REQ_SYNC | REQ_IDLE;
75 if (req->cmd->rw.control & cpu_to_le16(NVME_RW_FUA))
76 op_flags |= REQ_FUA;
77 } else {
78 op = REQ_OP_READ;
79 }
80
81 if (is_pci_p2pdma_page(sg_page(req->sg)))
82 op_flags |= REQ_NOMERGE;
83
84 sector = le64_to_cpu(req->cmd->rw.slba);
85 sector <<= (req->ns->blksize_shift - 9);
86
87 bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
88 bio_set_dev(bio, req->ns->bdev);
89 bio->bi_iter.bi_sector = sector;
90 bio->bi_private = req;
91 bio->bi_end_io = nvmet_bio_done;
92 bio_set_op_attrs(bio, op, op_flags);
93
94 for_each_sg(req->sg, sg, req->sg_cnt, i) {
95 while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
96 != sg->length) {
97 struct bio *prev = bio;
98
99 bio = bio_alloc(GFP_KERNEL, min(sg_cnt, BIO_MAX_PAGES));
100 bio_set_dev(bio, req->ns->bdev);
101 bio->bi_iter.bi_sector = sector;
102 bio_set_op_attrs(bio, op, op_flags);
103
104 bio_chain(bio, prev);
105 submit_bio(prev);
106 }
107
108 sector += sg->length >> 9;
109 sg_cnt--;
110 }
111
112 cookie = submit_bio(bio);
113}
114
115static void nvmet_bdev_execute_flush(struct nvmet_req *req)
116{
117 struct bio *bio = &req->b.inline_bio;
118
119 bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec));
120 bio_set_dev(bio, req->ns->bdev);
121 bio->bi_private = req;
122 bio->bi_end_io = nvmet_bio_done;
123 bio->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
124
125 submit_bio(bio);
126}
127
128static u16 nvmet_bdev_discard_range(struct nvmet_ns *ns,
129 struct nvme_dsm_range *range, struct bio **bio)
130{
131 int ret;
132
133 ret = __blkdev_issue_discard(ns->bdev,
134 le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
135 le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
136 GFP_KERNEL, 0, bio);
137 if (ret && ret != -EOPNOTSUPP)
138 return NVME_SC_INTERNAL | NVME_SC_DNR;
139 return 0;
140}
141
142static void nvmet_bdev_execute_discard(struct nvmet_req *req)
143{
144 struct nvme_dsm_range range;
145 struct bio *bio = NULL;
146 int i;
147 u16 status;
148
149 for (i = 0; i <= le32_to_cpu(req->cmd->dsm.nr); i++) {
150 status = nvmet_copy_from_sgl(req, i * sizeof(range), &range,
151 sizeof(range));
152 if (status)
153 break;
154
155 status = nvmet_bdev_discard_range(req->ns, &range, &bio);
156 if (status)
157 break;
158 }
159
160 if (bio) {
161 bio->bi_private = req;
162 bio->bi_end_io = nvmet_bio_done;
163 if (status) {
164 bio->bi_status = BLK_STS_IOERR;
165 bio_endio(bio);
166 } else {
167 submit_bio(bio);
168 }
169 } else {
170 nvmet_req_complete(req, status);
171 }
172}
173
174static void nvmet_bdev_execute_dsm(struct nvmet_req *req)
175{
176 switch (le32_to_cpu(req->cmd->dsm.attributes)) {
177 case NVME_DSMGMT_AD:
178 nvmet_bdev_execute_discard(req);
179 return;
180 case NVME_DSMGMT_IDR:
181 case NVME_DSMGMT_IDW:
182 default:
183
184 nvmet_req_complete(req, 0);
185 return;
186 }
187}
188
189static void nvmet_bdev_execute_write_zeroes(struct nvmet_req *req)
190{
191 struct nvme_write_zeroes_cmd *write_zeroes = &req->cmd->write_zeroes;
192 struct bio *bio = NULL;
193 u16 status = NVME_SC_SUCCESS;
194 sector_t sector;
195 sector_t nr_sector;
196
197 sector = le64_to_cpu(write_zeroes->slba) <<
198 (req->ns->blksize_shift - 9);
199 nr_sector = (((sector_t)le16_to_cpu(write_zeroes->length) + 1) <<
200 (req->ns->blksize_shift - 9));
201
202 if (__blkdev_issue_zeroout(req->ns->bdev, sector, nr_sector,
203 GFP_KERNEL, &bio, 0))
204 status = NVME_SC_INTERNAL | NVME_SC_DNR;
205
206 if (bio) {
207 bio->bi_private = req;
208 bio->bi_end_io = nvmet_bio_done;
209 submit_bio(bio);
210 } else {
211 nvmet_req_complete(req, status);
212 }
213}
214
215u16 nvmet_bdev_parse_io_cmd(struct nvmet_req *req)
216{
217 struct nvme_command *cmd = req->cmd;
218
219 switch (cmd->common.opcode) {
220 case nvme_cmd_read:
221 case nvme_cmd_write:
222 req->execute = nvmet_bdev_execute_rw;
223 req->data_len = nvmet_rw_len(req);
224 return 0;
225 case nvme_cmd_flush:
226 req->execute = nvmet_bdev_execute_flush;
227 req->data_len = 0;
228 return 0;
229 case nvme_cmd_dsm:
230 req->execute = nvmet_bdev_execute_dsm;
231 req->data_len = (le32_to_cpu(cmd->dsm.nr) + 1) *
232 sizeof(struct nvme_dsm_range);
233 return 0;
234 case nvme_cmd_write_zeroes:
235 req->execute = nvmet_bdev_execute_write_zeroes;
236 return 0;
237 default:
238 pr_err("unhandled cmd %d on qid %d\n", cmd->common.opcode,
239 req->sq->qid);
240 return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
241 }
242}
243
