1/* $OpenBSD: softraid_concat.c,v 1.27 2020/04/25 14:37:43 krw Exp $ */
2/*
3 * Copyright (c) 2008 Marco Peereboom <marco@peereboom.us>
4 * Copyright (c) 2011 Joel Sing <jsing@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include "bio.h"
20
21#include <sys/param.h>
22#include <sys/systm.h>
23#include <sys/device.h>
24#include <sys/buf.h>
25#include <sys/queue.h>
26#include <sys/sensors.h>
27
28#include <scsi/scsi_all.h>
29#include <scsi/scsiconf.h>
30#include <scsi/scsi_disk.h>
31
32#include <dev/softraidvar.h>
33
34/* CONCAT functions. */
35int	sr_concat_create(struct sr_discipline *, struct bioc_createraid *,
36	    int, int64_t);
37int	sr_concat_assemble(struct sr_discipline *, struct bioc_createraid *,
38	    int, void *);
39int	sr_concat_init(struct sr_discipline *);
40int	sr_concat_rw(struct sr_workunit *);
41
42/* Discipline initialisation. */
43void
44sr_concat_discipline_init(struct sr_discipline *sd)
45{
46	/* Fill out discipline members. */
47	sd->sd_type = SR_MD_CONCAT;
48	strlcpy(sd->sd_name, "CONCAT", sizeof(sd->sd_name));
49	sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE |
50	    SR_CAP_NON_COERCED;
51	sd->sd_max_wu = SR_CONCAT_NOWU;
52
53	/* Setup discipline specific function pointers. */
54	sd->sd_assemble = sr_concat_assemble;
55	sd->sd_create = sr_concat_create;
56	sd->sd_scsi_rw = sr_concat_rw;
57}
58
59int
60sr_concat_create(struct sr_discipline *sd, struct bioc_createraid *bc,
61    int no_chunk, int64_t coerced_size)
62{
63	int i;
64
65	if (no_chunk < 1) {
66		sr_error(sd->sd_sc, "%s requires one or more chunks",
67		    sd->sd_name);
68		return EINVAL;
69        }
70
71	sd->sd_meta->ssdi.ssd_size = 0;
72	for (i = 0; i < no_chunk; i++) {
73		sd->sd_meta->ssdi.ssd_size +=
74		    sd->sd_vol.sv_chunks[i]->src_size;
75	}
76
77	return sr_concat_init(sd);
78}
79
80int
81sr_concat_assemble(struct sr_discipline *sd, struct bioc_createraid *bc,
82    int no_chunk, void *data)
83{
84	return sr_concat_init(sd);
85}
86
87int
88sr_concat_init(struct sr_discipline *sd)
89{
90	sd->sd_max_ccb_per_wu = SR_CONCAT_NOWU * sd->sd_meta->ssdi.ssd_chunk_no;
91
92	return 0;
93}
94
95int
96sr_concat_rw(struct sr_workunit *wu)
97{
98	struct sr_discipline	*sd = wu->swu_dis;
99	struct scsi_xfer	*xs = wu->swu_xs;
100	struct sr_ccb		*ccb;
101	struct sr_chunk		*scp;
102	daddr_t			blkno;
103	int64_t			lbaoffs, offset;
104	int64_t			no_chunk, chunkend, chunk, chunksize;
105	int64_t			length, leftover;
106	u_int8_t		*data;
107
108	/* blkno and scsi error will be handled by sr_validate_io */
109	if (sr_validate_io(wu, &blkno, "sr_concat_rw"))
110		goto bad;
111
112	no_chunk = sd->sd_meta->ssdi.ssd_chunk_no;
113
114	DNPRINTF(SR_D_DIS, "%s: %s: front end io: blkno %lld size %d\n",
115	    DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname,
116	    (long long)blkno, xs->datalen);
117
118	/* All offsets are in bytes. */
119	lbaoffs = blkno << DEV_BSHIFT;
120	leftover = xs->datalen;
121	data = xs->data;
122	for (;;) {
123
124		chunkend = 0;
125		offset = lbaoffs;
126		for (chunk = 0; chunk < no_chunk; chunk++) {
127			chunksize = sd->sd_vol.sv_chunks[chunk]->src_size <<
128			    DEV_BSHIFT;
129			chunkend += chunksize;
130			if (lbaoffs < chunkend)
131				break;
132			offset -= chunksize;
133		}
134		if (lbaoffs > chunkend)
135			goto bad;
136
137		length = MIN(MIN(leftover, chunkend - lbaoffs), MAXPHYS);
138
139		/* make sure chunk is online */
140		scp = sd->sd_vol.sv_chunks[chunk];
141		if (scp->src_meta.scm_status != BIOC_SDONLINE)
142			goto bad;
143
144		DNPRINTF(SR_D_DIS, "%s: %s %s io lbaoffs %lld "
145		    "chunk %lld chunkend %lld offset %lld length %lld "
146		    "leftover %lld data %p\n",
147		    DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, sd->sd_name,
148		    lbaoffs, chunk, chunkend, offset, length, leftover, data);
149
150		blkno = offset >> DEV_BSHIFT;
151		ccb = sr_ccb_rw(sd, chunk, blkno, length, data, xs->flags, 0);
152		if (!ccb) {
153			/* should never happen but handle more gracefully */
154			printf("%s: %s: too many ccbs queued\n",
155			    DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname);
156			goto bad;
157		}
158		sr_wu_enqueue_ccb(wu, ccb);
159
160		leftover -= length;
161		if (leftover == 0)
162			break;
163		data += length;
164		lbaoffs += length;
165	}
166
167	sr_schedule_wu(wu);
168
169	return (0);
170
171bad:
172	/* wu is unwound by sr_wu_put */
173	return (1);
174}
175