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10#include "qemu/osdep.h"
11#include "qapi/error.h"
12#include "qemu/sockets.h"
13#include "block/block_int.h"
14#include "qapi/qmp/qdict.h"
15#include "qapi/qmp/qstring.h"
16#include "qemu/cutils.h"
17#include "qemu/module.h"
18#include "qemu/option.h"
19#include "qemu/memalign.h"
20
21typedef struct {
22 BdrvChild *test_file;
23} BDRVBlkverifyState;
24
25typedef struct BlkverifyRequest {
26 Coroutine *co;
27 BlockDriverState *bs;
28
29
30 bool is_write;
31 uint64_t offset;
32 uint64_t bytes;
33 int flags;
34
35 int (*request_fn)(BdrvChild *, int64_t, int64_t, QEMUIOVector *,
36 BdrvRequestFlags);
37
38 int ret;
39 int raw_ret;
40
41 unsigned int done;
42
43 QEMUIOVector *qiov;
44 QEMUIOVector *raw_qiov;
45} BlkverifyRequest;
46
47static void G_GNUC_PRINTF(2, 3) blkverify_err(BlkverifyRequest *r,
48 const char *fmt, ...)
49{
50 va_list ap;
51
52 va_start(ap, fmt);
53 fprintf(stderr, "blkverify: %s offset=%" PRId64 " bytes=%" PRId64 " ",
54 r->is_write ? "write" : "read", r->offset, r->bytes);
55 vfprintf(stderr, fmt, ap);
56 fprintf(stderr, "\n");
57 va_end(ap);
58 exit(1);
59}
60
61
62static void blkverify_parse_filename(const char *filename, QDict *options,
63 Error **errp)
64{
65 const char *c;
66 QString *raw_path;
67
68
69
70 if (!strstart(filename, "blkverify:", &filename)) {
71
72
73 qdict_put_str(options, "x-image", filename);
74 return;
75 }
76
77
78 c = strchr(filename, ':');
79 if (c == NULL) {
80 error_setg(errp, "blkverify requires raw copy and original image path");
81 return;
82 }
83
84
85 raw_path = qstring_from_substr(filename, 0, c - filename);
86 qdict_put(options, "x-raw", raw_path);
87
88
89 filename = c + 1;
90 qdict_put_str(options, "x-image", filename);
91}
92
93static QemuOptsList runtime_opts = {
94 .name = "blkverify",
95 .head = QTAILQ_HEAD_INITIALIZER(runtime_opts.head),
96 .desc = {
97 {
98 .name = "x-raw",
99 .type = QEMU_OPT_STRING,
100 .help = "[internal use only, will be removed]",
101 },
102 {
103 .name = "x-image",
104 .type = QEMU_OPT_STRING,
105 .help = "[internal use only, will be removed]",
106 },
107 { }
108 },
109};
110
111static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
112 Error **errp)
113{
114 BDRVBlkverifyState *s = bs->opaque;
115 QemuOpts *opts;
116 int ret;
117
118 opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
119 if (!qemu_opts_absorb_qdict(opts, options, errp)) {
120 ret = -EINVAL;
121 goto fail;
122 }
123
124
125 bs->file = bdrv_open_child(qemu_opt_get(opts, "x-raw"), options, "raw",
126 bs, &child_of_bds,
127 BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
128 false, errp);
129 if (!bs->file) {
130 ret = -EINVAL;
131 goto fail;
132 }
133
134
135 s->test_file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options,
136 "test", bs, &child_of_bds, BDRV_CHILD_DATA,
137 false, errp);
138 if (!s->test_file) {
139 ret = -EINVAL;
140 goto fail;
141 }
142
143 bs->supported_write_flags = BDRV_REQ_WRITE_UNCHANGED;
144 bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED;
145
146 ret = 0;
147fail:
148 qemu_opts_del(opts);
149 return ret;
150}
151
152static void blkverify_close(BlockDriverState *bs)
153{
154 BDRVBlkverifyState *s = bs->opaque;
155
156 bdrv_unref_child(bs, s->test_file);
157 s->test_file = NULL;
158}
159
160static int64_t blkverify_getlength(BlockDriverState *bs)
161{
162 BDRVBlkverifyState *s = bs->opaque;
163
164 return bdrv_getlength(s->test_file->bs);
165}
166
167static void coroutine_fn blkverify_do_test_req(void *opaque)
168{
169 BlkverifyRequest *r = opaque;
170 BDRVBlkverifyState *s = r->bs->opaque;
171
172 r->ret = r->request_fn(s->test_file, r->offset, r->bytes, r->qiov,
173 r->flags);
174 r->done++;
175 qemu_coroutine_enter_if_inactive(r->co);
176}
177
178static void coroutine_fn blkverify_do_raw_req(void *opaque)
179{
180 BlkverifyRequest *r = opaque;
181
182 r->raw_ret = r->request_fn(r->bs->file, r->offset, r->bytes, r->raw_qiov,
183 r->flags);
184 r->done++;
185 qemu_coroutine_enter_if_inactive(r->co);
186}
187
188static int coroutine_fn
189blkverify_co_prwv(BlockDriverState *bs, BlkverifyRequest *r, uint64_t offset,
190 uint64_t bytes, QEMUIOVector *qiov, QEMUIOVector *raw_qiov,
191 int flags, bool is_write)
192{
193 Coroutine *co_a, *co_b;
194
195 *r = (BlkverifyRequest) {
196 .co = qemu_coroutine_self(),
197 .bs = bs,
198 .offset = offset,
199 .bytes = bytes,
200 .qiov = qiov,
201 .raw_qiov = raw_qiov,
202 .flags = flags,
203 .is_write = is_write,
204 .request_fn = is_write ? bdrv_co_pwritev : bdrv_co_preadv,
205 };
206
207 co_a = qemu_coroutine_create(blkverify_do_test_req, r);
208 co_b = qemu_coroutine_create(blkverify_do_raw_req, r);
209
210 qemu_coroutine_enter(co_a);
211 qemu_coroutine_enter(co_b);
212
213 while (r->done < 2) {
214 qemu_coroutine_yield();
215 }
216
217 if (r->ret != r->raw_ret) {
218 blkverify_err(r, "return value mismatch %d != %d", r->ret, r->raw_ret);
219 }
220
221 return r->ret;
222}
223
224static int coroutine_fn
225blkverify_co_preadv(BlockDriverState *bs, int64_t offset, int64_t bytes,
226 QEMUIOVector *qiov, BdrvRequestFlags flags)
227{
228 BlkverifyRequest r;
229 QEMUIOVector raw_qiov;
230 void *buf;
231 ssize_t cmp_offset;
232 int ret;
233
234 buf = qemu_blockalign(bs->file->bs, qiov->size);
235 qemu_iovec_init(&raw_qiov, qiov->niov);
236 qemu_iovec_clone(&raw_qiov, qiov, buf);
237
238 ret = blkverify_co_prwv(bs, &r, offset, bytes, qiov, &raw_qiov, flags,
239 false);
240
241 cmp_offset = qemu_iovec_compare(qiov, &raw_qiov);
242 if (cmp_offset != -1) {
243 blkverify_err(&r, "contents mismatch at offset %" PRId64,
244 offset + cmp_offset);
245 }
246
247 qemu_iovec_destroy(&raw_qiov);
248 qemu_vfree(buf);
249
250 return ret;
251}
252
253static int coroutine_fn
254blkverify_co_pwritev(BlockDriverState *bs, int64_t offset, int64_t bytes,
255 QEMUIOVector *qiov, BdrvRequestFlags flags)
256{
257 BlkverifyRequest r;
258 return blkverify_co_prwv(bs, &r, offset, bytes, qiov, qiov, flags, true);
259}
260
261static int blkverify_co_flush(BlockDriverState *bs)
262{
263 BDRVBlkverifyState *s = bs->opaque;
264
265
266 return bdrv_co_flush(s->test_file->bs);
267}
268
269static bool blkverify_recurse_can_replace(BlockDriverState *bs,
270 BlockDriverState *to_replace)
271{
272 BDRVBlkverifyState *s = bs->opaque;
273
274
275
276
277
278
279 return bdrv_recurse_can_replace(bs->file->bs, to_replace) ||
280 bdrv_recurse_can_replace(s->test_file->bs, to_replace);
281}
282
283static void blkverify_refresh_filename(BlockDriverState *bs)
284{
285 BDRVBlkverifyState *s = bs->opaque;
286
287 if (bs->file->bs->exact_filename[0]
288 && s->test_file->bs->exact_filename[0])
289 {
290 int ret = snprintf(bs->exact_filename, sizeof(bs->exact_filename),
291 "blkverify:%s:%s",
292 bs->file->bs->exact_filename,
293 s->test_file->bs->exact_filename);
294 if (ret >= sizeof(bs->exact_filename)) {
295
296 bs->exact_filename[0] = 0;
297 }
298 }
299}
300
301static char *blkverify_dirname(BlockDriverState *bs, Error **errp)
302{
303
304
305
306 error_setg(errp, "Cannot generate a base directory for blkverify nodes");
307 return NULL;
308}
309
310static BlockDriver bdrv_blkverify = {
311 .format_name = "blkverify",
312 .protocol_name = "blkverify",
313 .instance_size = sizeof(BDRVBlkverifyState),
314
315 .bdrv_parse_filename = blkverify_parse_filename,
316 .bdrv_file_open = blkverify_open,
317 .bdrv_close = blkverify_close,
318 .bdrv_child_perm = bdrv_default_perms,
319 .bdrv_getlength = blkverify_getlength,
320 .bdrv_refresh_filename = blkverify_refresh_filename,
321 .bdrv_dirname = blkverify_dirname,
322
323 .bdrv_co_preadv = blkverify_co_preadv,
324 .bdrv_co_pwritev = blkverify_co_pwritev,
325 .bdrv_co_flush = blkverify_co_flush,
326
327 .is_filter = true,
328 .bdrv_recurse_can_replace = blkverify_recurse_can_replace,
329};
330
331static void bdrv_blkverify_init(void)
332{
333 bdrv_register(&bdrv_blkverify);
334}
335
336block_init(bdrv_blkverify_init);
337