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e1c66c6d LE |
1 | /* BlockDriver implementation for "raw" |
2 | * | |
ad82be2f | 3 | * Copyright (C) 2010-2016 Red Hat, Inc. |
ff369a48 | 4 | * Copyright (C) 2010, Blue Swirl <blauwirbel@gmail.com> |
775d6afd | 5 | * Copyright (C) 2009, Anthony Liguori <aliguori@us.ibm.com> |
e1c66c6d LE |
6 | * |
7 | * Author: | |
8 | * Laszlo Ersek <lersek@redhat.com> | |
9 | * | |
10 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
11 | * of this software and associated documentation files (the "Software"), to | |
12 | * deal in the Software without restriction, including without limitation the | |
13 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
14 | * sell copies of the Software, and to permit persons to whom the Software is | |
15 | * furnished to do so, subject to the following conditions: | |
16 | * | |
17 | * The above copyright notice and this permission notice shall be included in | |
18 | * all copies or substantial portions of the Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
23 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
24 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
25 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
26 | * IN THE SOFTWARE. | |
27 | */ | |
28 | ||
80c71a24 | 29 | #include "qemu/osdep.h" |
e1c66c6d | 30 | #include "block/block_int.h" |
da34e65c | 31 | #include "qapi/error.h" |
ff369a48 LE |
32 | #include "qemu/option.h" |
33 | ||
cd3a4cf6 CL |
34 | static QemuOptsList raw_create_opts = { |
35 | .name = "raw-create-opts", | |
36 | .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head), | |
37 | .desc = { | |
38 | { | |
39 | .name = BLOCK_OPT_SIZE, | |
40 | .type = QEMU_OPT_SIZE, | |
41 | .help = "Virtual disk size" | |
42 | }, | |
43 | { /* end of list */ } | |
44 | } | |
ff369a48 | 45 | }; |
e1c66c6d | 46 | |
7a6d3fc5 LE |
47 | static int raw_reopen_prepare(BDRVReopenState *reopen_state, |
48 | BlockReopenQueue *queue, Error **errp) | |
e1c66c6d | 49 | { |
7a6d3fc5 | 50 | return 0; |
e1c66c6d LE |
51 | } |
52 | ||
decaeed7 EB |
53 | static int coroutine_fn raw_co_preadv(BlockDriverState *bs, uint64_t offset, |
54 | uint64_t bytes, QEMUIOVector *qiov, | |
55 | int flags) | |
e1c66c6d | 56 | { |
9eaafd90 | 57 | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
decaeed7 | 58 | return bdrv_co_preadv(bs->file, offset, bytes, qiov, flags); |
e1c66c6d LE |
59 | } |
60 | ||
decaeed7 EB |
61 | static int coroutine_fn raw_co_pwritev(BlockDriverState *bs, uint64_t offset, |
62 | uint64_t bytes, QEMUIOVector *qiov, | |
63 | int flags) | |
e1c66c6d | 64 | { |
38f3ef57 KW |
65 | void *buf = NULL; |
66 | BlockDriver *drv; | |
67 | QEMUIOVector local_qiov; | |
68 | int ret; | |
69 | ||
decaeed7 EB |
70 | if (bs->probed && offset < BLOCK_PROBE_BUF_SIZE && bytes) { |
71 | /* Handling partial writes would be a pain - so we just | |
72 | * require that guests have 512-byte request alignment if | |
73 | * probing occurred */ | |
38f3ef57 KW |
74 | QEMU_BUILD_BUG_ON(BLOCK_PROBE_BUF_SIZE != 512); |
75 | QEMU_BUILD_BUG_ON(BDRV_SECTOR_SIZE != 512); | |
decaeed7 | 76 | assert(offset == 0 && bytes >= BLOCK_PROBE_BUF_SIZE); |
38f3ef57 | 77 | |
9a4f4c31 | 78 | buf = qemu_try_blockalign(bs->file->bs, 512); |
38f3ef57 KW |
79 | if (!buf) { |
80 | ret = -ENOMEM; | |
81 | goto fail; | |
82 | } | |
83 | ||
84 | ret = qemu_iovec_to_buf(qiov, 0, buf, 512); | |
85 | if (ret != 512) { | |
86 | ret = -EINVAL; | |
87 | goto fail; | |
88 | } | |
89 | ||
90 | drv = bdrv_probe_all(buf, 512, NULL); | |
91 | if (drv != bs->drv) { | |
92 | ret = -EPERM; | |
93 | goto fail; | |
94 | } | |
95 | ||
96 | /* Use the checked buffer, a malicious guest might be overwriting its | |
97 | * original buffer in the background. */ | |
98 | qemu_iovec_init(&local_qiov, qiov->niov + 1); | |
99 | qemu_iovec_add(&local_qiov, buf, 512); | |
100 | qemu_iovec_concat(&local_qiov, qiov, 512, qiov->size - 512); | |
101 | qiov = &local_qiov; | |
102 | } | |
103 | ||
9eaafd90 | 104 | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
decaeed7 | 105 | ret = bdrv_co_pwritev(bs->file, offset, bytes, qiov, flags); |
38f3ef57 KW |
106 | |
107 | fail: | |
108 | if (qiov == &local_qiov) { | |
109 | qemu_iovec_destroy(&local_qiov); | |
110 | } | |
111 | qemu_vfree(buf); | |
112 | return ret; | |
e1c66c6d LE |
113 | } |
114 | ||
b6b8a333 PB |
115 | static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs, |
116 | int64_t sector_num, | |
67a0fd2a FZ |
117 | int nb_sectors, int *pnum, |
118 | BlockDriverState **file) | |
e1c66c6d | 119 | { |
92bc50a5 | 120 | *pnum = nb_sectors; |
02650acb | 121 | *file = bs->file->bs; |
92bc50a5 PL |
122 | return BDRV_BLOCK_RAW | BDRV_BLOCK_OFFSET_VALID | BDRV_BLOCK_DATA | |
123 | (sector_num << BDRV_SECTOR_BITS); | |
e1c66c6d LE |
124 | } |
125 | ||
39ad937e EB |
126 | static int coroutine_fn raw_co_pwrite_zeroes(BlockDriverState *bs, |
127 | int64_t offset, int count, | |
128 | BdrvRequestFlags flags) | |
e1c66c6d | 129 | { |
a03ef88f | 130 | return bdrv_co_pwrite_zeroes(bs->file, offset, count, flags); |
e1c66c6d LE |
131 | } |
132 | ||
5f61ad07 EB |
133 | static int coroutine_fn raw_co_pdiscard(BlockDriverState *bs, |
134 | int64_t offset, int count) | |
e1c66c6d | 135 | { |
5f61ad07 | 136 | return bdrv_co_pdiscard(bs->file->bs, offset, count); |
e1c66c6d LE |
137 | } |
138 | ||
7a6d3fc5 | 139 | static int64_t raw_getlength(BlockDriverState *bs) |
e1c66c6d | 140 | { |
9a4f4c31 | 141 | return bdrv_getlength(bs->file->bs); |
e1c66c6d LE |
142 | } |
143 | ||
7a6d3fc5 | 144 | static int raw_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
e1c66c6d | 145 | { |
9a4f4c31 | 146 | return bdrv_get_info(bs->file->bs, bdi); |
e1c66c6d LE |
147 | } |
148 | ||
decaeed7 EB |
149 | static void raw_refresh_limits(BlockDriverState *bs, Error **errp) |
150 | { | |
151 | if (bs->probed) { | |
152 | /* To make it easier to protect the first sector, any probed | |
153 | * image is restricted to read-modify-write on sub-sector | |
154 | * operations. */ | |
155 | bs->bl.request_alignment = BDRV_SECTOR_SIZE; | |
156 | } | |
157 | } | |
158 | ||
7a6d3fc5 | 159 | static int raw_truncate(BlockDriverState *bs, int64_t offset) |
e1c66c6d | 160 | { |
9a4f4c31 | 161 | return bdrv_truncate(bs->file->bs, offset); |
e1c66c6d LE |
162 | } |
163 | ||
7a6d3fc5 | 164 | static int raw_media_changed(BlockDriverState *bs) |
e1c66c6d | 165 | { |
9a4f4c31 | 166 | return bdrv_media_changed(bs->file->bs); |
e1c66c6d LE |
167 | } |
168 | ||
7a6d3fc5 | 169 | static void raw_eject(BlockDriverState *bs, bool eject_flag) |
e1c66c6d | 170 | { |
9a4f4c31 | 171 | bdrv_eject(bs->file->bs, eject_flag); |
e1c66c6d LE |
172 | } |
173 | ||
7a6d3fc5 | 174 | static void raw_lock_medium(BlockDriverState *bs, bool locked) |
e1c66c6d | 175 | { |
9a4f4c31 | 176 | bdrv_lock_medium(bs->file->bs, locked); |
e1c66c6d LE |
177 | } |
178 | ||
7c84b1b8 MA |
179 | static BlockAIOCB *raw_aio_ioctl(BlockDriverState *bs, |
180 | unsigned long int req, void *buf, | |
097310b5 | 181 | BlockCompletionFunc *cb, |
7c84b1b8 | 182 | void *opaque) |
e1c66c6d | 183 | { |
9a4f4c31 | 184 | return bdrv_aio_ioctl(bs->file->bs, req, buf, cb, opaque); |
e1c66c6d LE |
185 | } |
186 | ||
7a6d3fc5 | 187 | static int raw_has_zero_init(BlockDriverState *bs) |
e1c66c6d | 188 | { |
9a4f4c31 | 189 | return bdrv_has_zero_init(bs->file->bs); |
e1c66c6d LE |
190 | } |
191 | ||
cd3a4cf6 | 192 | static int raw_create(const char *filename, QemuOpts *opts, Error **errp) |
1565262c | 193 | { |
9be38598 | 194 | return bdrv_create_file(filename, opts, errp); |
1565262c | 195 | } |
01dd96d8 | 196 | |
015a1036 HR |
197 | static int raw_open(BlockDriverState *bs, QDict *options, int flags, |
198 | Error **errp) | |
01dd96d8 | 199 | { |
9a4f4c31 | 200 | bs->sg = bs->file->bs->sg; |
8a39b4d6 EB |
201 | bs->supported_write_flags = BDRV_REQ_FUA & |
202 | bs->file->bs->supported_write_flags; | |
203 | bs->supported_zero_flags = (BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP) & | |
204 | bs->file->bs->supported_zero_flags; | |
38f3ef57 KW |
205 | |
206 | if (bs->probed && !bdrv_is_read_only(bs)) { | |
207 | fprintf(stderr, | |
208 | "WARNING: Image format was not specified for '%s' and probing " | |
209 | "guessed raw.\n" | |
210 | " Automatically detecting the format is dangerous for " | |
211 | "raw images, write operations on block 0 will be restricted.\n" | |
212 | " Specify the 'raw' format explicitly to remove the " | |
213 | "restrictions.\n", | |
9a4f4c31 | 214 | bs->file->bs->filename); |
38f3ef57 KW |
215 | } |
216 | ||
01dd96d8 LE |
217 | return 0; |
218 | } | |
219 | ||
7a6d3fc5 | 220 | static void raw_close(BlockDriverState *bs) |
01dd96d8 LE |
221 | { |
222 | } | |
223 | ||
7a6d3fc5 | 224 | static int raw_probe(const uint8_t *buf, int buf_size, const char *filename) |
01dd96d8 LE |
225 | { |
226 | /* smallest possible positive score so that raw is used if and only if no | |
227 | * other block driver works | |
228 | */ | |
229 | return 1; | |
230 | } | |
775d6afd | 231 | |
1a9335e4 ET |
232 | static int raw_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) |
233 | { | |
9a4f4c31 | 234 | return bdrv_probe_blocksizes(bs->file->bs, bsz); |
1a9335e4 ET |
235 | } |
236 | ||
237 | static int raw_probe_geometry(BlockDriverState *bs, HDGeometry *geo) | |
238 | { | |
9a4f4c31 | 239 | return bdrv_probe_geometry(bs->file->bs, geo); |
1a9335e4 ET |
240 | } |
241 | ||
5f535a94 | 242 | BlockDriver bdrv_raw = { |
775d6afd LE |
243 | .format_name = "raw", |
244 | .bdrv_probe = &raw_probe, | |
245 | .bdrv_reopen_prepare = &raw_reopen_prepare, | |
246 | .bdrv_open = &raw_open, | |
247 | .bdrv_close = &raw_close, | |
c282e1fd | 248 | .bdrv_create = &raw_create, |
decaeed7 EB |
249 | .bdrv_co_preadv = &raw_co_preadv, |
250 | .bdrv_co_pwritev = &raw_co_pwritev, | |
39ad937e | 251 | .bdrv_co_pwrite_zeroes = &raw_co_pwrite_zeroes, |
5f61ad07 | 252 | .bdrv_co_pdiscard = &raw_co_pdiscard, |
b6b8a333 | 253 | .bdrv_co_get_block_status = &raw_co_get_block_status, |
775d6afd LE |
254 | .bdrv_truncate = &raw_truncate, |
255 | .bdrv_getlength = &raw_getlength, | |
b94a2610 | 256 | .has_variable_length = true, |
775d6afd | 257 | .bdrv_get_info = &raw_get_info, |
decaeed7 | 258 | .bdrv_refresh_limits = &raw_refresh_limits, |
1a9335e4 ET |
259 | .bdrv_probe_blocksizes = &raw_probe_blocksizes, |
260 | .bdrv_probe_geometry = &raw_probe_geometry, | |
775d6afd LE |
261 | .bdrv_media_changed = &raw_media_changed, |
262 | .bdrv_eject = &raw_eject, | |
263 | .bdrv_lock_medium = &raw_lock_medium, | |
775d6afd | 264 | .bdrv_aio_ioctl = &raw_aio_ioctl, |
cd3a4cf6 | 265 | .create_opts = &raw_create_opts, |
775d6afd LE |
266 | .bdrv_has_zero_init = &raw_has_zero_init |
267 | }; | |
268 | ||
269 | static void bdrv_raw_init(void) | |
270 | { | |
271 | bdrv_register(&bdrv_raw); | |
272 | } | |
273 | ||
274 | block_init(bdrv_raw_init); |