root / block / qcow.c @ 7a3f5fe9
History | View | Annotate | Download (26 kB)
1 | ea2384d3 | bellard | /*
|
---|---|---|---|
2 | ea2384d3 | bellard | * Block driver for the QCOW format
|
3 | 5fafdf24 | ths | *
|
4 | 83f64091 | bellard | * Copyright (c) 2004-2006 Fabrice Bellard
|
5 | 5fafdf24 | ths | *
|
6 | ea2384d3 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 | ea2384d3 | bellard | * of this software and associated documentation files (the "Software"), to deal
|
8 | ea2384d3 | bellard | * in the Software without restriction, including without limitation the rights
|
9 | ea2384d3 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 | ea2384d3 | bellard | * copies of the Software, and to permit persons to whom the Software is
|
11 | ea2384d3 | bellard | * furnished to do so, subject to the following conditions:
|
12 | ea2384d3 | bellard | *
|
13 | ea2384d3 | bellard | * The above copyright notice and this permission notice shall be included in
|
14 | ea2384d3 | bellard | * all copies or substantial portions of the Software.
|
15 | ea2384d3 | bellard | *
|
16 | ea2384d3 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 | ea2384d3 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 | ea2384d3 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 | ea2384d3 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 | ea2384d3 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 | ea2384d3 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 | ea2384d3 | bellard | * THE SOFTWARE.
|
23 | ea2384d3 | bellard | */
|
24 | faf07963 | pbrook | #include "qemu-common.h" |
25 | ea2384d3 | bellard | #include "block_int.h" |
26 | 5efa9d5a | Anthony Liguori | #include "module.h" |
27 | 28d34b82 | bellard | #include <zlib.h> |
28 | ea2384d3 | bellard | #include "aes.h" |
29 | ea2384d3 | bellard | |
30 | ea2384d3 | bellard | /**************************************************************/
|
31 | ea2384d3 | bellard | /* QEMU COW block driver with compression and encryption support */
|
32 | ea2384d3 | bellard | |
33 | ea2384d3 | bellard | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
34 | ea2384d3 | bellard | #define QCOW_VERSION 1 |
35 | ea2384d3 | bellard | |
36 | ea2384d3 | bellard | #define QCOW_CRYPT_NONE 0 |
37 | ea2384d3 | bellard | #define QCOW_CRYPT_AES 1 |
38 | ea2384d3 | bellard | |
39 | ea2384d3 | bellard | #define QCOW_OFLAG_COMPRESSED (1LL << 63) |
40 | ea2384d3 | bellard | |
41 | ea2384d3 | bellard | typedef struct QCowHeader { |
42 | ea2384d3 | bellard | uint32_t magic; |
43 | ea2384d3 | bellard | uint32_t version; |
44 | ea2384d3 | bellard | uint64_t backing_file_offset; |
45 | ea2384d3 | bellard | uint32_t backing_file_size; |
46 | ea2384d3 | bellard | uint32_t mtime; |
47 | ea2384d3 | bellard | uint64_t size; /* in bytes */
|
48 | ea2384d3 | bellard | uint8_t cluster_bits; |
49 | ea2384d3 | bellard | uint8_t l2_bits; |
50 | ea2384d3 | bellard | uint32_t crypt_method; |
51 | ea2384d3 | bellard | uint64_t l1_table_offset; |
52 | ea2384d3 | bellard | } QCowHeader; |
53 | ea2384d3 | bellard | |
54 | ea2384d3 | bellard | #define L2_CACHE_SIZE 16 |
55 | ea2384d3 | bellard | |
56 | ea2384d3 | bellard | typedef struct BDRVQcowState { |
57 | ea2384d3 | bellard | int cluster_bits;
|
58 | ea2384d3 | bellard | int cluster_size;
|
59 | ea2384d3 | bellard | int cluster_sectors;
|
60 | ea2384d3 | bellard | int l2_bits;
|
61 | ea2384d3 | bellard | int l2_size;
|
62 | ea2384d3 | bellard | int l1_size;
|
63 | ea2384d3 | bellard | uint64_t cluster_offset_mask; |
64 | ea2384d3 | bellard | uint64_t l1_table_offset; |
65 | ea2384d3 | bellard | uint64_t *l1_table; |
66 | ea2384d3 | bellard | uint64_t *l2_cache; |
67 | ea2384d3 | bellard | uint64_t l2_cache_offsets[L2_CACHE_SIZE]; |
68 | ea2384d3 | bellard | uint32_t l2_cache_counts[L2_CACHE_SIZE]; |
69 | ea2384d3 | bellard | uint8_t *cluster_cache; |
70 | ea2384d3 | bellard | uint8_t *cluster_data; |
71 | ea2384d3 | bellard | uint64_t cluster_cache_offset; |
72 | ea2384d3 | bellard | uint32_t crypt_method; /* current crypt method, 0 if no key yet */
|
73 | ea2384d3 | bellard | uint32_t crypt_method_header; |
74 | ea2384d3 | bellard | AES_KEY aes_encrypt_key; |
75 | ea2384d3 | bellard | AES_KEY aes_decrypt_key; |
76 | 52b8eb60 | Kevin Wolf | CoMutex lock; |
77 | ea2384d3 | bellard | } BDRVQcowState; |
78 | ea2384d3 | bellard | |
79 | 66f82cee | Kevin Wolf | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset); |
80 | ea2384d3 | bellard | |
81 | ea2384d3 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
82 | ea2384d3 | bellard | { |
83 | ea2384d3 | bellard | const QCowHeader *cow_header = (const void *)buf; |
84 | 3b46e624 | ths | |
85 | 712e7874 | bellard | if (buf_size >= sizeof(QCowHeader) && |
86 | 712e7874 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
87 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
88 | ea2384d3 | bellard | return 100; |
89 | ea2384d3 | bellard | else
|
90 | ea2384d3 | bellard | return 0; |
91 | ea2384d3 | bellard | } |
92 | ea2384d3 | bellard | |
93 | 66f82cee | Kevin Wolf | static int qcow_open(BlockDriverState *bs, int flags) |
94 | ea2384d3 | bellard | { |
95 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
96 | 66f82cee | Kevin Wolf | int len, i, shift;
|
97 | ea2384d3 | bellard | QCowHeader header; |
98 | 83f64091 | bellard | |
99 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header)) |
100 | ea2384d3 | bellard | goto fail;
|
101 | ea2384d3 | bellard | be32_to_cpus(&header.magic); |
102 | ea2384d3 | bellard | be32_to_cpus(&header.version); |
103 | ea2384d3 | bellard | be64_to_cpus(&header.backing_file_offset); |
104 | ea2384d3 | bellard | be32_to_cpus(&header.backing_file_size); |
105 | ea2384d3 | bellard | be32_to_cpus(&header.mtime); |
106 | ea2384d3 | bellard | be64_to_cpus(&header.size); |
107 | ea2384d3 | bellard | be32_to_cpus(&header.crypt_method); |
108 | ea2384d3 | bellard | be64_to_cpus(&header.l1_table_offset); |
109 | 3b46e624 | ths | |
110 | ea2384d3 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
|
111 | ea2384d3 | bellard | goto fail;
|
112 | ea2384d3 | bellard | if (header.size <= 1 || header.cluster_bits < 9) |
113 | ea2384d3 | bellard | goto fail;
|
114 | ea2384d3 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
|
115 | ea2384d3 | bellard | goto fail;
|
116 | ea2384d3 | bellard | s->crypt_method_header = header.crypt_method; |
117 | ea2384d3 | bellard | if (s->crypt_method_header)
|
118 | ea2384d3 | bellard | bs->encrypted = 1;
|
119 | ea2384d3 | bellard | s->cluster_bits = header.cluster_bits; |
120 | ea2384d3 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
121 | ea2384d3 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
122 | ea2384d3 | bellard | s->l2_bits = header.l2_bits; |
123 | ea2384d3 | bellard | s->l2_size = 1 << s->l2_bits;
|
124 | ea2384d3 | bellard | bs->total_sectors = header.size / 512;
|
125 | ea2384d3 | bellard | s->cluster_offset_mask = (1LL << (63 - s->cluster_bits)) - 1; |
126 | ea2384d3 | bellard | |
127 | ea2384d3 | bellard | /* read the level 1 table */
|
128 | ea2384d3 | bellard | shift = s->cluster_bits + s->l2_bits; |
129 | ea2384d3 | bellard | s->l1_size = (header.size + (1LL << shift) - 1) >> shift; |
130 | ea2384d3 | bellard | |
131 | ea2384d3 | bellard | s->l1_table_offset = header.l1_table_offset; |
132 | 7267c094 | Anthony Liguori | s->l1_table = g_malloc(s->l1_size * sizeof(uint64_t));
|
133 | ea2384d3 | bellard | if (!s->l1_table)
|
134 | ea2384d3 | bellard | goto fail;
|
135 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
136 | ea2384d3 | bellard | s->l1_size * sizeof(uint64_t))
|
137 | ea2384d3 | bellard | goto fail;
|
138 | ea2384d3 | bellard | for(i = 0;i < s->l1_size; i++) { |
139 | ea2384d3 | bellard | be64_to_cpus(&s->l1_table[i]); |
140 | ea2384d3 | bellard | } |
141 | ea2384d3 | bellard | /* alloc L2 cache */
|
142 | 7267c094 | Anthony Liguori | s->l2_cache = g_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
|
143 | ea2384d3 | bellard | if (!s->l2_cache)
|
144 | ea2384d3 | bellard | goto fail;
|
145 | 7267c094 | Anthony Liguori | s->cluster_cache = g_malloc(s->cluster_size); |
146 | ea2384d3 | bellard | if (!s->cluster_cache)
|
147 | ea2384d3 | bellard | goto fail;
|
148 | 7267c094 | Anthony Liguori | s->cluster_data = g_malloc(s->cluster_size); |
149 | ea2384d3 | bellard | if (!s->cluster_data)
|
150 | ea2384d3 | bellard | goto fail;
|
151 | ea2384d3 | bellard | s->cluster_cache_offset = -1;
|
152 | 3b46e624 | ths | |
153 | ea2384d3 | bellard | /* read the backing file name */
|
154 | ea2384d3 | bellard | if (header.backing_file_offset != 0) { |
155 | ea2384d3 | bellard | len = header.backing_file_size; |
156 | ea2384d3 | bellard | if (len > 1023) |
157 | ea2384d3 | bellard | len = 1023;
|
158 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
|
159 | ea2384d3 | bellard | goto fail;
|
160 | ea2384d3 | bellard | bs->backing_file[len] = '\0';
|
161 | ea2384d3 | bellard | } |
162 | de33b1f3 | Scott Wood | |
163 | de33b1f3 | Scott Wood | qemu_co_mutex_init(&s->lock); |
164 | ea2384d3 | bellard | return 0; |
165 | ea2384d3 | bellard | |
166 | ea2384d3 | bellard | fail:
|
167 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
168 | 7267c094 | Anthony Liguori | g_free(s->l2_cache); |
169 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
170 | 7267c094 | Anthony Liguori | g_free(s->cluster_data); |
171 | ea2384d3 | bellard | return -1; |
172 | ea2384d3 | bellard | } |
173 | ea2384d3 | bellard | |
174 | ea2384d3 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
175 | ea2384d3 | bellard | { |
176 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
177 | ea2384d3 | bellard | uint8_t keybuf[16];
|
178 | ea2384d3 | bellard | int len, i;
|
179 | 3b46e624 | ths | |
180 | ea2384d3 | bellard | memset(keybuf, 0, 16); |
181 | ea2384d3 | bellard | len = strlen(key); |
182 | ea2384d3 | bellard | if (len > 16) |
183 | ea2384d3 | bellard | len = 16;
|
184 | ea2384d3 | bellard | /* XXX: we could compress the chars to 7 bits to increase
|
185 | ea2384d3 | bellard | entropy */
|
186 | ea2384d3 | bellard | for(i = 0;i < len;i++) { |
187 | ea2384d3 | bellard | keybuf[i] = key[i]; |
188 | ea2384d3 | bellard | } |
189 | ea2384d3 | bellard | s->crypt_method = s->crypt_method_header; |
190 | ea2384d3 | bellard | |
191 | ea2384d3 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
192 | ea2384d3 | bellard | return -1; |
193 | ea2384d3 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
194 | ea2384d3 | bellard | return -1; |
195 | ea2384d3 | bellard | return 0; |
196 | ea2384d3 | bellard | } |
197 | ea2384d3 | bellard | |
198 | ea2384d3 | bellard | /* The crypt function is compatible with the linux cryptoloop
|
199 | ea2384d3 | bellard | algorithm for < 4 GB images. NOTE: out_buf == in_buf is
|
200 | ea2384d3 | bellard | supported */
|
201 | ea2384d3 | bellard | static void encrypt_sectors(BDRVQcowState *s, int64_t sector_num, |
202 | ea2384d3 | bellard | uint8_t *out_buf, const uint8_t *in_buf,
|
203 | ea2384d3 | bellard | int nb_sectors, int enc, |
204 | ea2384d3 | bellard | const AES_KEY *key)
|
205 | ea2384d3 | bellard | { |
206 | ea2384d3 | bellard | union {
|
207 | ea2384d3 | bellard | uint64_t ll[2];
|
208 | ea2384d3 | bellard | uint8_t b[16];
|
209 | ea2384d3 | bellard | } ivec; |
210 | ea2384d3 | bellard | int i;
|
211 | ea2384d3 | bellard | |
212 | ea2384d3 | bellard | for(i = 0; i < nb_sectors; i++) { |
213 | ea2384d3 | bellard | ivec.ll[0] = cpu_to_le64(sector_num);
|
214 | ea2384d3 | bellard | ivec.ll[1] = 0; |
215 | 5fafdf24 | ths | AES_cbc_encrypt(in_buf, out_buf, 512, key,
|
216 | ea2384d3 | bellard | ivec.b, enc); |
217 | ea2384d3 | bellard | sector_num++; |
218 | ea2384d3 | bellard | in_buf += 512;
|
219 | ea2384d3 | bellard | out_buf += 512;
|
220 | ea2384d3 | bellard | } |
221 | ea2384d3 | bellard | } |
222 | ea2384d3 | bellard | |
223 | ea2384d3 | bellard | /* 'allocate' is:
|
224 | ea2384d3 | bellard | *
|
225 | ea2384d3 | bellard | * 0 to not allocate.
|
226 | ea2384d3 | bellard | *
|
227 | ea2384d3 | bellard | * 1 to allocate a normal cluster (for sector indexes 'n_start' to
|
228 | ea2384d3 | bellard | * 'n_end')
|
229 | ea2384d3 | bellard | *
|
230 | ea2384d3 | bellard | * 2 to allocate a compressed cluster of size
|
231 | ea2384d3 | bellard | * 'compressed_size'. 'compressed_size' must be > 0 and <
|
232 | 5fafdf24 | ths | * cluster_size
|
233 | ea2384d3 | bellard | *
|
234 | ea2384d3 | bellard | * return 0 if not allocated.
|
235 | ea2384d3 | bellard | */
|
236 | ea2384d3 | bellard | static uint64_t get_cluster_offset(BlockDriverState *bs,
|
237 | ea2384d3 | bellard | uint64_t offset, int allocate,
|
238 | ea2384d3 | bellard | int compressed_size,
|
239 | ea2384d3 | bellard | int n_start, int n_end) |
240 | ea2384d3 | bellard | { |
241 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
242 | ea2384d3 | bellard | int min_index, i, j, l1_index, l2_index;
|
243 | ea2384d3 | bellard | uint64_t l2_offset, *l2_table, cluster_offset, tmp; |
244 | ea2384d3 | bellard | uint32_t min_count; |
245 | ea2384d3 | bellard | int new_l2_table;
|
246 | 3b46e624 | ths | |
247 | ea2384d3 | bellard | l1_index = offset >> (s->l2_bits + s->cluster_bits); |
248 | ea2384d3 | bellard | l2_offset = s->l1_table[l1_index]; |
249 | ea2384d3 | bellard | new_l2_table = 0;
|
250 | ea2384d3 | bellard | if (!l2_offset) {
|
251 | ea2384d3 | bellard | if (!allocate)
|
252 | ea2384d3 | bellard | return 0; |
253 | ea2384d3 | bellard | /* allocate a new l2 entry */
|
254 | 66f82cee | Kevin Wolf | l2_offset = bdrv_getlength(bs->file); |
255 | ea2384d3 | bellard | /* round to cluster size */
|
256 | ea2384d3 | bellard | l2_offset = (l2_offset + s->cluster_size - 1) & ~(s->cluster_size - 1); |
257 | ea2384d3 | bellard | /* update the L1 entry */
|
258 | ea2384d3 | bellard | s->l1_table[l1_index] = l2_offset; |
259 | ea2384d3 | bellard | tmp = cpu_to_be64(l2_offset); |
260 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file,
|
261 | 5e5557d9 | Kevin Wolf | s->l1_table_offset + l1_index * sizeof(tmp),
|
262 | 5e5557d9 | Kevin Wolf | &tmp, sizeof(tmp)) < 0) |
263 | ea2384d3 | bellard | return 0; |
264 | ea2384d3 | bellard | new_l2_table = 1;
|
265 | ea2384d3 | bellard | } |
266 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
267 | ea2384d3 | bellard | if (l2_offset == s->l2_cache_offsets[i]) {
|
268 | ea2384d3 | bellard | /* increment the hit count */
|
269 | ea2384d3 | bellard | if (++s->l2_cache_counts[i] == 0xffffffff) { |
270 | ea2384d3 | bellard | for(j = 0; j < L2_CACHE_SIZE; j++) { |
271 | ea2384d3 | bellard | s->l2_cache_counts[j] >>= 1;
|
272 | ea2384d3 | bellard | } |
273 | ea2384d3 | bellard | } |
274 | ea2384d3 | bellard | l2_table = s->l2_cache + (i << s->l2_bits); |
275 | ea2384d3 | bellard | goto found;
|
276 | ea2384d3 | bellard | } |
277 | ea2384d3 | bellard | } |
278 | ea2384d3 | bellard | /* not found: load a new entry in the least used one */
|
279 | ea2384d3 | bellard | min_index = 0;
|
280 | ea2384d3 | bellard | min_count = 0xffffffff;
|
281 | ea2384d3 | bellard | for(i = 0; i < L2_CACHE_SIZE; i++) { |
282 | ea2384d3 | bellard | if (s->l2_cache_counts[i] < min_count) {
|
283 | ea2384d3 | bellard | min_count = s->l2_cache_counts[i]; |
284 | ea2384d3 | bellard | min_index = i; |
285 | ea2384d3 | bellard | } |
286 | ea2384d3 | bellard | } |
287 | ea2384d3 | bellard | l2_table = s->l2_cache + (min_index << s->l2_bits); |
288 | ea2384d3 | bellard | if (new_l2_table) {
|
289 | ea2384d3 | bellard | memset(l2_table, 0, s->l2_size * sizeof(uint64_t)); |
290 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, l2_offset, l2_table,
|
291 | 5e5557d9 | Kevin Wolf | s->l2_size * sizeof(uint64_t)) < 0) |
292 | ea2384d3 | bellard | return 0; |
293 | ea2384d3 | bellard | } else {
|
294 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, l2_offset, l2_table, s->l2_size * sizeof(uint64_t)) != |
295 | ea2384d3 | bellard | s->l2_size * sizeof(uint64_t))
|
296 | ea2384d3 | bellard | return 0; |
297 | ea2384d3 | bellard | } |
298 | ea2384d3 | bellard | s->l2_cache_offsets[min_index] = l2_offset; |
299 | ea2384d3 | bellard | s->l2_cache_counts[min_index] = 1;
|
300 | ea2384d3 | bellard | found:
|
301 | ea2384d3 | bellard | l2_index = (offset >> s->cluster_bits) & (s->l2_size - 1);
|
302 | ea2384d3 | bellard | cluster_offset = be64_to_cpu(l2_table[l2_index]); |
303 | 5fafdf24 | ths | if (!cluster_offset ||
|
304 | ea2384d3 | bellard | ((cluster_offset & QCOW_OFLAG_COMPRESSED) && allocate == 1)) {
|
305 | ea2384d3 | bellard | if (!allocate)
|
306 | ea2384d3 | bellard | return 0; |
307 | ea2384d3 | bellard | /* allocate a new cluster */
|
308 | ea2384d3 | bellard | if ((cluster_offset & QCOW_OFLAG_COMPRESSED) &&
|
309 | ea2384d3 | bellard | (n_end - n_start) < s->cluster_sectors) { |
310 | ea2384d3 | bellard | /* if the cluster is already compressed, we must
|
311 | ea2384d3 | bellard | decompress it in the case it is not completely
|
312 | ea2384d3 | bellard | overwritten */
|
313 | 66f82cee | Kevin Wolf | if (decompress_cluster(bs, cluster_offset) < 0) |
314 | ea2384d3 | bellard | return 0; |
315 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
316 | 5fafdf24 | ths | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
317 | ea2384d3 | bellard | ~(s->cluster_size - 1);
|
318 | ea2384d3 | bellard | /* write the cluster content */
|
319 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset, s->cluster_cache, s->cluster_size) !=
|
320 | ea2384d3 | bellard | s->cluster_size) |
321 | ea2384d3 | bellard | return -1; |
322 | ea2384d3 | bellard | } else {
|
323 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
324 | 7f48fa1f | aliguori | if (allocate == 1) { |
325 | 7f48fa1f | aliguori | /* round to cluster size */
|
326 | 7f48fa1f | aliguori | cluster_offset = (cluster_offset + s->cluster_size - 1) &
|
327 | 7f48fa1f | aliguori | ~(s->cluster_size - 1);
|
328 | 66f82cee | Kevin Wolf | bdrv_truncate(bs->file, cluster_offset + s->cluster_size); |
329 | 7f48fa1f | aliguori | /* if encrypted, we must initialize the cluster
|
330 | 7f48fa1f | aliguori | content which won't be written */
|
331 | 7f48fa1f | aliguori | if (s->crypt_method &&
|
332 | 7f48fa1f | aliguori | (n_end - n_start) < s->cluster_sectors) { |
333 | 7f48fa1f | aliguori | uint64_t start_sect; |
334 | 7f48fa1f | aliguori | start_sect = (offset & ~(s->cluster_size - 1)) >> 9; |
335 | 7f48fa1f | aliguori | memset(s->cluster_data + 512, 0x00, 512); |
336 | 7f48fa1f | aliguori | for(i = 0; i < s->cluster_sectors; i++) { |
337 | 7f48fa1f | aliguori | if (i < n_start || i >= n_end) {
|
338 | 7f48fa1f | aliguori | encrypt_sectors(s, start_sect + i, |
339 | 7f48fa1f | aliguori | s->cluster_data, |
340 | 7f48fa1f | aliguori | s->cluster_data + 512, 1, 1, |
341 | 7f48fa1f | aliguori | &s->aes_encrypt_key); |
342 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset + i * 512, |
343 | 7f48fa1f | aliguori | s->cluster_data, 512) != 512) |
344 | 7f48fa1f | aliguori | return -1; |
345 | 7f48fa1f | aliguori | } |
346 | ea2384d3 | bellard | } |
347 | ea2384d3 | bellard | } |
348 | 7f48fa1f | aliguori | } else if (allocate == 2) { |
349 | 7f48fa1f | aliguori | cluster_offset |= QCOW_OFLAG_COMPRESSED | |
350 | 7f48fa1f | aliguori | (uint64_t)compressed_size << (63 - s->cluster_bits);
|
351 | ea2384d3 | bellard | } |
352 | ea2384d3 | bellard | } |
353 | ea2384d3 | bellard | /* update L2 table */
|
354 | ea2384d3 | bellard | tmp = cpu_to_be64(cluster_offset); |
355 | ea2384d3 | bellard | l2_table[l2_index] = tmp; |
356 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, l2_offset + l2_index * sizeof(tmp), |
357 | 5e5557d9 | Kevin Wolf | &tmp, sizeof(tmp)) < 0) |
358 | ea2384d3 | bellard | return 0; |
359 | ea2384d3 | bellard | } |
360 | ea2384d3 | bellard | return cluster_offset;
|
361 | ea2384d3 | bellard | } |
362 | ea2384d3 | bellard | |
363 | 5fafdf24 | ths | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
364 | ea2384d3 | bellard | int nb_sectors, int *pnum) |
365 | ea2384d3 | bellard | { |
366 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
367 | ea2384d3 | bellard | int index_in_cluster, n;
|
368 | ea2384d3 | bellard | uint64_t cluster_offset; |
369 | ea2384d3 | bellard | |
370 | ea2384d3 | bellard | cluster_offset = get_cluster_offset(bs, sector_num << 9, 0, 0, 0, 0); |
371 | ea2384d3 | bellard | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
372 | ea2384d3 | bellard | n = s->cluster_sectors - index_in_cluster; |
373 | ea2384d3 | bellard | if (n > nb_sectors)
|
374 | ea2384d3 | bellard | n = nb_sectors; |
375 | ea2384d3 | bellard | *pnum = n; |
376 | ea2384d3 | bellard | return (cluster_offset != 0); |
377 | ea2384d3 | bellard | } |
378 | ea2384d3 | bellard | |
379 | ea2384d3 | bellard | static int decompress_buffer(uint8_t *out_buf, int out_buf_size, |
380 | ea2384d3 | bellard | const uint8_t *buf, int buf_size) |
381 | ea2384d3 | bellard | { |
382 | ea2384d3 | bellard | z_stream strm1, *strm = &strm1; |
383 | ea2384d3 | bellard | int ret, out_len;
|
384 | ea2384d3 | bellard | |
385 | ea2384d3 | bellard | memset(strm, 0, sizeof(*strm)); |
386 | ea2384d3 | bellard | |
387 | ea2384d3 | bellard | strm->next_in = (uint8_t *)buf; |
388 | ea2384d3 | bellard | strm->avail_in = buf_size; |
389 | ea2384d3 | bellard | strm->next_out = out_buf; |
390 | ea2384d3 | bellard | strm->avail_out = out_buf_size; |
391 | ea2384d3 | bellard | |
392 | ea2384d3 | bellard | ret = inflateInit2(strm, -12);
|
393 | ea2384d3 | bellard | if (ret != Z_OK)
|
394 | ea2384d3 | bellard | return -1; |
395 | ea2384d3 | bellard | ret = inflate(strm, Z_FINISH); |
396 | ea2384d3 | bellard | out_len = strm->next_out - out_buf; |
397 | ea2384d3 | bellard | if ((ret != Z_STREAM_END && ret != Z_BUF_ERROR) ||
|
398 | ea2384d3 | bellard | out_len != out_buf_size) { |
399 | ea2384d3 | bellard | inflateEnd(strm); |
400 | ea2384d3 | bellard | return -1; |
401 | ea2384d3 | bellard | } |
402 | ea2384d3 | bellard | inflateEnd(strm); |
403 | ea2384d3 | bellard | return 0; |
404 | ea2384d3 | bellard | } |
405 | 3b46e624 | ths | |
406 | 66f82cee | Kevin Wolf | static int decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset) |
407 | ea2384d3 | bellard | { |
408 | 66f82cee | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
409 | ea2384d3 | bellard | int ret, csize;
|
410 | ea2384d3 | bellard | uint64_t coffset; |
411 | ea2384d3 | bellard | |
412 | ea2384d3 | bellard | coffset = cluster_offset & s->cluster_offset_mask; |
413 | ea2384d3 | bellard | if (s->cluster_cache_offset != coffset) {
|
414 | ea2384d3 | bellard | csize = cluster_offset >> (63 - s->cluster_bits);
|
415 | ea2384d3 | bellard | csize &= (s->cluster_size - 1);
|
416 | 66f82cee | Kevin Wolf | ret = bdrv_pread(bs->file, coffset, s->cluster_data, csize); |
417 | 5fafdf24 | ths | if (ret != csize)
|
418 | ea2384d3 | bellard | return -1; |
419 | ea2384d3 | bellard | if (decompress_buffer(s->cluster_cache, s->cluster_size,
|
420 | ea2384d3 | bellard | s->cluster_data, csize) < 0) {
|
421 | ea2384d3 | bellard | return -1; |
422 | ea2384d3 | bellard | } |
423 | ea2384d3 | bellard | s->cluster_cache_offset = coffset; |
424 | ea2384d3 | bellard | } |
425 | ea2384d3 | bellard | return 0; |
426 | ea2384d3 | bellard | } |
427 | ea2384d3 | bellard | |
428 | 27deebe8 | Frediano Ziglio | static int qcow_co_readv(BlockDriverState *bs, int64_t sector_num, |
429 | 27deebe8 | Frediano Ziglio | int nb_sectors, QEMUIOVector *qiov)
|
430 | 83f64091 | bellard | { |
431 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
432 | 83f64091 | bellard | int index_in_cluster;
|
433 | 27deebe8 | Frediano Ziglio | int ret = 0, n; |
434 | 43ca85b5 | Frediano Ziglio | uint64_t cluster_offset; |
435 | 430bbaaa | Frediano Ziglio | struct iovec hd_iov;
|
436 | 430bbaaa | Frediano Ziglio | QEMUIOVector hd_qiov; |
437 | 27deebe8 | Frediano Ziglio | uint8_t *buf; |
438 | 27deebe8 | Frediano Ziglio | void *orig_buf;
|
439 | 83f64091 | bellard | |
440 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
441 | 27deebe8 | Frediano Ziglio | buf = orig_buf = qemu_blockalign(bs, qiov->size); |
442 | 27deebe8 | Frediano Ziglio | } else {
|
443 | 27deebe8 | Frediano Ziglio | orig_buf = NULL;
|
444 | 27deebe8 | Frediano Ziglio | buf = (uint8_t *)qiov->iov->iov_base; |
445 | 83f64091 | bellard | } |
446 | 3b46e624 | ths | |
447 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
448 | 27deebe8 | Frediano Ziglio | |
449 | 27deebe8 | Frediano Ziglio | while (nb_sectors != 0) { |
450 | 27deebe8 | Frediano Ziglio | /* prepare next request */
|
451 | 27deebe8 | Frediano Ziglio | cluster_offset = get_cluster_offset(bs, sector_num << 9,
|
452 | 27deebe8 | Frediano Ziglio | 0, 0, 0, 0); |
453 | 27deebe8 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
454 | 27deebe8 | Frediano Ziglio | n = s->cluster_sectors - index_in_cluster; |
455 | 27deebe8 | Frediano Ziglio | if (n > nb_sectors) {
|
456 | 27deebe8 | Frediano Ziglio | n = nb_sectors; |
457 | 27deebe8 | Frediano Ziglio | } |
458 | ce1a14dc | pbrook | |
459 | 27deebe8 | Frediano Ziglio | if (!cluster_offset) {
|
460 | 27deebe8 | Frediano Ziglio | if (bs->backing_hd) {
|
461 | 27deebe8 | Frediano Ziglio | /* read from the base image */
|
462 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)buf;
|
463 | 27deebe8 | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
464 | 27deebe8 | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
465 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
466 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_readv(bs->backing_hd, sector_num, |
467 | 27deebe8 | Frediano Ziglio | n, &hd_qiov); |
468 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
469 | 27deebe8 | Frediano Ziglio | if (ret < 0) { |
470 | 27deebe8 | Frediano Ziglio | goto fail;
|
471 | 27deebe8 | Frediano Ziglio | } |
472 | 27deebe8 | Frediano Ziglio | } else {
|
473 | 27deebe8 | Frediano Ziglio | /* Note: in this case, no need to wait */
|
474 | 27deebe8 | Frediano Ziglio | memset(buf, 0, 512 * n); |
475 | 27deebe8 | Frediano Ziglio | } |
476 | 27deebe8 | Frediano Ziglio | } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) { |
477 | 27deebe8 | Frediano Ziglio | /* add AIO support for compressed blocks ? */
|
478 | 27deebe8 | Frediano Ziglio | if (decompress_cluster(bs, cluster_offset) < 0) { |
479 | 27deebe8 | Frediano Ziglio | goto fail;
|
480 | 27deebe8 | Frediano Ziglio | } |
481 | 27deebe8 | Frediano Ziglio | memcpy(buf, |
482 | 27deebe8 | Frediano Ziglio | s->cluster_cache + index_in_cluster * 512, 512 * n); |
483 | 27deebe8 | Frediano Ziglio | } else {
|
484 | 27deebe8 | Frediano Ziglio | if ((cluster_offset & 511) != 0) { |
485 | 27deebe8 | Frediano Ziglio | goto fail;
|
486 | 27deebe8 | Frediano Ziglio | } |
487 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)buf;
|
488 | 430bbaaa | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
489 | 430bbaaa | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
490 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
491 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_readv(bs->file, |
492 | 27deebe8 | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
493 | 430bbaaa | Frediano Ziglio | n, &hd_qiov); |
494 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_lock(&s->lock); |
495 | 52b8eb60 | Kevin Wolf | if (ret < 0) { |
496 | 27deebe8 | Frediano Ziglio | break;
|
497 | 27deebe8 | Frediano Ziglio | } |
498 | 27deebe8 | Frediano Ziglio | if (s->crypt_method) {
|
499 | 27deebe8 | Frediano Ziglio | encrypt_sectors(s, sector_num, buf, buf, |
500 | 27deebe8 | Frediano Ziglio | n, 0,
|
501 | 27deebe8 | Frediano Ziglio | &s->aes_decrypt_key); |
502 | 5614c188 | Stefan Weil | } |
503 | 5614c188 | Stefan Weil | } |
504 | 27deebe8 | Frediano Ziglio | ret = 0;
|
505 | f141eafe | aliguori | |
506 | 27deebe8 | Frediano Ziglio | nb_sectors -= n; |
507 | 27deebe8 | Frediano Ziglio | sector_num += n; |
508 | 27deebe8 | Frediano Ziglio | buf += n * 512;
|
509 | 43ca85b5 | Frediano Ziglio | } |
510 | 43ca85b5 | Frediano Ziglio | |
511 | 27deebe8 | Frediano Ziglio | done:
|
512 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
513 | 52b8eb60 | Kevin Wolf | |
514 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
515 | 27deebe8 | Frediano Ziglio | qemu_iovec_from_buffer(qiov, orig_buf, qiov->size); |
516 | 27deebe8 | Frediano Ziglio | qemu_vfree(orig_buf); |
517 | b11a24de | Kevin Wolf | } |
518 | b11a24de | Kevin Wolf | |
519 | 52b8eb60 | Kevin Wolf | return ret;
|
520 | 27deebe8 | Frediano Ziglio | |
521 | 27deebe8 | Frediano Ziglio | fail:
|
522 | 27deebe8 | Frediano Ziglio | ret = -EIO; |
523 | 27deebe8 | Frediano Ziglio | goto done;
|
524 | 83f64091 | bellard | } |
525 | 83f64091 | bellard | |
526 | 27deebe8 | Frediano Ziglio | static int qcow_co_writev(BlockDriverState *bs, int64_t sector_num, |
527 | 27deebe8 | Frediano Ziglio | int nb_sectors, QEMUIOVector *qiov)
|
528 | 83f64091 | bellard | { |
529 | 83f64091 | bellard | BDRVQcowState *s = bs->opaque; |
530 | 83f64091 | bellard | int index_in_cluster;
|
531 | 83f64091 | bellard | uint64_t cluster_offset; |
532 | 83f64091 | bellard | const uint8_t *src_buf;
|
533 | 27deebe8 | Frediano Ziglio | int ret = 0, n; |
534 | 430bbaaa | Frediano Ziglio | uint8_t *cluster_data = NULL;
|
535 | 430bbaaa | Frediano Ziglio | struct iovec hd_iov;
|
536 | 430bbaaa | Frediano Ziglio | QEMUIOVector hd_qiov; |
537 | 27deebe8 | Frediano Ziglio | uint8_t *buf; |
538 | 27deebe8 | Frediano Ziglio | void *orig_buf;
|
539 | ce1a14dc | pbrook | |
540 | 27deebe8 | Frediano Ziglio | s->cluster_cache_offset = -1; /* disable compressed cache */ |
541 | 3b46e624 | ths | |
542 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
543 | 27deebe8 | Frediano Ziglio | buf = orig_buf = qemu_blockalign(bs, qiov->size); |
544 | 27deebe8 | Frediano Ziglio | qemu_iovec_to_buffer(qiov, buf); |
545 | 83f64091 | bellard | } else {
|
546 | 27deebe8 | Frediano Ziglio | orig_buf = NULL;
|
547 | 27deebe8 | Frediano Ziglio | buf = (uint8_t *)qiov->iov->iov_base; |
548 | 83f64091 | bellard | } |
549 | c87c0672 | aliguori | |
550 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_lock(&s->lock); |
551 | 43ca85b5 | Frediano Ziglio | |
552 | 27deebe8 | Frediano Ziglio | while (nb_sectors != 0) { |
553 | 83f64091 | bellard | |
554 | 27deebe8 | Frediano Ziglio | index_in_cluster = sector_num & (s->cluster_sectors - 1);
|
555 | 27deebe8 | Frediano Ziglio | n = s->cluster_sectors - index_in_cluster; |
556 | 27deebe8 | Frediano Ziglio | if (n > nb_sectors) {
|
557 | 27deebe8 | Frediano Ziglio | n = nb_sectors; |
558 | 27deebe8 | Frediano Ziglio | } |
559 | 27deebe8 | Frediano Ziglio | cluster_offset = get_cluster_offset(bs, sector_num << 9, 1, 0, |
560 | 27deebe8 | Frediano Ziglio | index_in_cluster, |
561 | 27deebe8 | Frediano Ziglio | index_in_cluster + n); |
562 | 27deebe8 | Frediano Ziglio | if (!cluster_offset || (cluster_offset & 511) != 0) { |
563 | 27deebe8 | Frediano Ziglio | ret = -EIO; |
564 | 27deebe8 | Frediano Ziglio | break;
|
565 | 27deebe8 | Frediano Ziglio | } |
566 | 27deebe8 | Frediano Ziglio | if (s->crypt_method) {
|
567 | 27deebe8 | Frediano Ziglio | if (!cluster_data) {
|
568 | 27deebe8 | Frediano Ziglio | cluster_data = g_malloc0(s->cluster_size); |
569 | 27deebe8 | Frediano Ziglio | } |
570 | 27deebe8 | Frediano Ziglio | encrypt_sectors(s, sector_num, cluster_data, buf, |
571 | 27deebe8 | Frediano Ziglio | n, 1, &s->aes_encrypt_key);
|
572 | 27deebe8 | Frediano Ziglio | src_buf = cluster_data; |
573 | 27deebe8 | Frediano Ziglio | } else {
|
574 | 27deebe8 | Frediano Ziglio | src_buf = buf; |
575 | 27deebe8 | Frediano Ziglio | } |
576 | 83f64091 | bellard | |
577 | 27deebe8 | Frediano Ziglio | hd_iov.iov_base = (void *)src_buf;
|
578 | 27deebe8 | Frediano Ziglio | hd_iov.iov_len = n * 512;
|
579 | 27deebe8 | Frediano Ziglio | qemu_iovec_init_external(&hd_qiov, &hd_iov, 1);
|
580 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_unlock(&s->lock); |
581 | 27deebe8 | Frediano Ziglio | ret = bdrv_co_writev(bs->file, |
582 | 27deebe8 | Frediano Ziglio | (cluster_offset >> 9) + index_in_cluster,
|
583 | 27deebe8 | Frediano Ziglio | n, &hd_qiov); |
584 | 27deebe8 | Frediano Ziglio | qemu_co_mutex_lock(&s->lock); |
585 | 27deebe8 | Frediano Ziglio | if (ret < 0) { |
586 | 27deebe8 | Frediano Ziglio | break;
|
587 | 27deebe8 | Frediano Ziglio | } |
588 | 27deebe8 | Frediano Ziglio | ret = 0;
|
589 | ad53089b | Christoph Hellwig | |
590 | 27deebe8 | Frediano Ziglio | nb_sectors -= n; |
591 | 27deebe8 | Frediano Ziglio | sector_num += n; |
592 | 27deebe8 | Frediano Ziglio | buf += n * 512;
|
593 | 27deebe8 | Frediano Ziglio | } |
594 | 52b8eb60 | Kevin Wolf | qemu_co_mutex_unlock(&s->lock); |
595 | 3b46e624 | ths | |
596 | 27deebe8 | Frediano Ziglio | if (qiov->niov > 1) { |
597 | 27deebe8 | Frediano Ziglio | qemu_vfree(orig_buf); |
598 | b11a24de | Kevin Wolf | } |
599 | 27deebe8 | Frediano Ziglio | free(cluster_data); |
600 | b11a24de | Kevin Wolf | |
601 | 52b8eb60 | Kevin Wolf | return ret;
|
602 | 83f64091 | bellard | } |
603 | 83f64091 | bellard | |
604 | e2731add | bellard | static void qcow_close(BlockDriverState *bs) |
605 | ea2384d3 | bellard | { |
606 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
607 | 7267c094 | Anthony Liguori | g_free(s->l1_table); |
608 | 7267c094 | Anthony Liguori | g_free(s->l2_cache); |
609 | 7267c094 | Anthony Liguori | g_free(s->cluster_cache); |
610 | 7267c094 | Anthony Liguori | g_free(s->cluster_data); |
611 | ea2384d3 | bellard | } |
612 | ea2384d3 | bellard | |
613 | 0e7e1989 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
614 | ea2384d3 | bellard | { |
615 | ea2384d3 | bellard | int fd, header_size, backing_filename_len, l1_size, i, shift;
|
616 | ea2384d3 | bellard | QCowHeader header; |
617 | ea2384d3 | bellard | uint64_t tmp; |
618 | 0e7e1989 | Kevin Wolf | int64_t total_size = 0;
|
619 | 0e7e1989 | Kevin Wolf | const char *backing_file = NULL; |
620 | 0e7e1989 | Kevin Wolf | int flags = 0; |
621 | 3e1a8134 | Kirill A. Shutemov | int ret;
|
622 | 0e7e1989 | Kevin Wolf | |
623 | 0e7e1989 | Kevin Wolf | /* Read out options */
|
624 | 0e7e1989 | Kevin Wolf | while (options && options->name) {
|
625 | 0e7e1989 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
626 | 0e7e1989 | Kevin Wolf | total_size = options->value.n / 512;
|
627 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
628 | 0e7e1989 | Kevin Wolf | backing_file = options->value.s; |
629 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
630 | 0e7e1989 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
631 | 0e7e1989 | Kevin Wolf | } |
632 | 0e7e1989 | Kevin Wolf | options++; |
633 | 0e7e1989 | Kevin Wolf | } |
634 | ea2384d3 | bellard | |
635 | 83f64091 | bellard | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
636 | ea2384d3 | bellard | if (fd < 0) |
637 | 98c2b2f4 | Juan Quintela | return -errno;
|
638 | ea2384d3 | bellard | memset(&header, 0, sizeof(header)); |
639 | ea2384d3 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
640 | ea2384d3 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
641 | ea2384d3 | bellard | header.size = cpu_to_be64(total_size * 512);
|
642 | ea2384d3 | bellard | header_size = sizeof(header);
|
643 | ea2384d3 | bellard | backing_filename_len = 0;
|
644 | ea2384d3 | bellard | if (backing_file) {
|
645 | 7852e5da | aurel32 | if (strcmp(backing_file, "fat:")) { |
646 | 7852e5da | aurel32 | header.backing_file_offset = cpu_to_be64(header_size); |
647 | 7852e5da | aurel32 | backing_filename_len = strlen(backing_file); |
648 | 7852e5da | aurel32 | header.backing_file_size = cpu_to_be32(backing_filename_len); |
649 | 7852e5da | aurel32 | header_size += backing_filename_len; |
650 | 7852e5da | aurel32 | } else {
|
651 | 7852e5da | aurel32 | /* special backing file for vvfat */
|
652 | 7852e5da | aurel32 | backing_file = NULL;
|
653 | 7852e5da | aurel32 | } |
654 | ea2384d3 | bellard | header.cluster_bits = 9; /* 512 byte cluster to avoid copying |
655 | ea2384d3 | bellard | unmodifyed sectors */
|
656 | ea2384d3 | bellard | header.l2_bits = 12; /* 32 KB L2 tables */ |
657 | ea2384d3 | bellard | } else {
|
658 | ea2384d3 | bellard | header.cluster_bits = 12; /* 4 KB clusters */ |
659 | ea2384d3 | bellard | header.l2_bits = 9; /* 4 KB L2 tables */ |
660 | ea2384d3 | bellard | } |
661 | ea2384d3 | bellard | header_size = (header_size + 7) & ~7; |
662 | ea2384d3 | bellard | shift = header.cluster_bits + header.l2_bits; |
663 | ea2384d3 | bellard | l1_size = ((total_size * 512) + (1LL << shift) - 1) >> shift; |
664 | ea2384d3 | bellard | |
665 | ea2384d3 | bellard | header.l1_table_offset = cpu_to_be64(header_size); |
666 | ec36ba14 | ths | if (flags & BLOCK_FLAG_ENCRYPT) {
|
667 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
668 | ea2384d3 | bellard | } else {
|
669 | ea2384d3 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
670 | ea2384d3 | bellard | } |
671 | 3b46e624 | ths | |
672 | ea2384d3 | bellard | /* write all the data */
|
673 | 3e1a8134 | Kirill A. Shutemov | ret = qemu_write_full(fd, &header, sizeof(header));
|
674 | 3e1a8134 | Kirill A. Shutemov | if (ret != sizeof(header)) { |
675 | 98c2b2f4 | Juan Quintela | ret = -errno; |
676 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
677 | 3e1a8134 | Kirill A. Shutemov | } |
678 | 3e1a8134 | Kirill A. Shutemov | |
679 | ea2384d3 | bellard | if (backing_file) {
|
680 | 3e1a8134 | Kirill A. Shutemov | ret = qemu_write_full(fd, backing_file, backing_filename_len); |
681 | 3e1a8134 | Kirill A. Shutemov | if (ret != backing_filename_len) {
|
682 | 98c2b2f4 | Juan Quintela | ret = -errno; |
683 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
684 | 3e1a8134 | Kirill A. Shutemov | } |
685 | 3e1a8134 | Kirill A. Shutemov | |
686 | ea2384d3 | bellard | } |
687 | ea2384d3 | bellard | lseek(fd, header_size, SEEK_SET); |
688 | ea2384d3 | bellard | tmp = 0;
|
689 | ea2384d3 | bellard | for(i = 0;i < l1_size; i++) { |
690 | 3e1a8134 | Kirill A. Shutemov | ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
691 | 3e1a8134 | Kirill A. Shutemov | if (ret != sizeof(tmp)) { |
692 | 98c2b2f4 | Juan Quintela | ret = -errno; |
693 | 3e1a8134 | Kirill A. Shutemov | goto exit;
|
694 | 3e1a8134 | Kirill A. Shutemov | } |
695 | ea2384d3 | bellard | } |
696 | 3e1a8134 | Kirill A. Shutemov | |
697 | 3e1a8134 | Kirill A. Shutemov | ret = 0;
|
698 | 3e1a8134 | Kirill A. Shutemov | exit:
|
699 | ea2384d3 | bellard | close(fd); |
700 | 3e1a8134 | Kirill A. Shutemov | return ret;
|
701 | ea2384d3 | bellard | } |
702 | ea2384d3 | bellard | |
703 | c47c33b0 | bellard | static int qcow_make_empty(BlockDriverState *bs) |
704 | 95389c86 | bellard | { |
705 | 95389c86 | bellard | BDRVQcowState *s = bs->opaque; |
706 | 95389c86 | bellard | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
707 | 83f64091 | bellard | int ret;
|
708 | 95389c86 | bellard | |
709 | 95389c86 | bellard | memset(s->l1_table, 0, l1_length);
|
710 | 5e5557d9 | Kevin Wolf | if (bdrv_pwrite_sync(bs->file, s->l1_table_offset, s->l1_table,
|
711 | 5e5557d9 | Kevin Wolf | l1_length) < 0)
|
712 | 5e5557d9 | Kevin Wolf | return -1; |
713 | 66f82cee | Kevin Wolf | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length); |
714 | 83f64091 | bellard | if (ret < 0) |
715 | 83f64091 | bellard | return ret;
|
716 | 95389c86 | bellard | |
717 | 95389c86 | bellard | memset(s->l2_cache, 0, s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t)); |
718 | 95389c86 | bellard | memset(s->l2_cache_offsets, 0, L2_CACHE_SIZE * sizeof(uint64_t)); |
719 | 95389c86 | bellard | memset(s->l2_cache_counts, 0, L2_CACHE_SIZE * sizeof(uint32_t)); |
720 | 95389c86 | bellard | |
721 | 95389c86 | bellard | return 0; |
722 | 95389c86 | bellard | } |
723 | 95389c86 | bellard | |
724 | ea2384d3 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
725 | ea2384d3 | bellard | tables to avoid losing bytes in alignment */
|
726 | 5fafdf24 | ths | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
727 | c47c33b0 | bellard | const uint8_t *buf, int nb_sectors) |
728 | ea2384d3 | bellard | { |
729 | ea2384d3 | bellard | BDRVQcowState *s = bs->opaque; |
730 | ea2384d3 | bellard | z_stream strm; |
731 | ea2384d3 | bellard | int ret, out_len;
|
732 | ea2384d3 | bellard | uint8_t *out_buf; |
733 | ea2384d3 | bellard | uint64_t cluster_offset; |
734 | ea2384d3 | bellard | |
735 | c47c33b0 | bellard | if (nb_sectors != s->cluster_sectors)
|
736 | c47c33b0 | bellard | return -EINVAL;
|
737 | ea2384d3 | bellard | |
738 | 7267c094 | Anthony Liguori | out_buf = g_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
739 | ea2384d3 | bellard | if (!out_buf)
|
740 | ea2384d3 | bellard | return -1; |
741 | ea2384d3 | bellard | |
742 | ea2384d3 | bellard | /* best compression, small window, no zlib header */
|
743 | ea2384d3 | bellard | memset(&strm, 0, sizeof(strm)); |
744 | ea2384d3 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
745 | 5fafdf24 | ths | Z_DEFLATED, -12,
|
746 | ea2384d3 | bellard | 9, Z_DEFAULT_STRATEGY);
|
747 | ea2384d3 | bellard | if (ret != 0) { |
748 | 7267c094 | Anthony Liguori | g_free(out_buf); |
749 | ea2384d3 | bellard | return -1; |
750 | ea2384d3 | bellard | } |
751 | ea2384d3 | bellard | |
752 | ea2384d3 | bellard | strm.avail_in = s->cluster_size; |
753 | ea2384d3 | bellard | strm.next_in = (uint8_t *)buf; |
754 | ea2384d3 | bellard | strm.avail_out = s->cluster_size; |
755 | ea2384d3 | bellard | strm.next_out = out_buf; |
756 | ea2384d3 | bellard | |
757 | ea2384d3 | bellard | ret = deflate(&strm, Z_FINISH); |
758 | ea2384d3 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
759 | 7267c094 | Anthony Liguori | g_free(out_buf); |
760 | ea2384d3 | bellard | deflateEnd(&strm); |
761 | ea2384d3 | bellard | return -1; |
762 | ea2384d3 | bellard | } |
763 | ea2384d3 | bellard | out_len = strm.next_out - out_buf; |
764 | ea2384d3 | bellard | |
765 | ea2384d3 | bellard | deflateEnd(&strm); |
766 | ea2384d3 | bellard | |
767 | ea2384d3 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
768 | ea2384d3 | bellard | /* could not compress: write normal cluster */
|
769 | ade40677 | Kevin Wolf | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
770 | ea2384d3 | bellard | } else {
|
771 | 5fafdf24 | ths | cluster_offset = get_cluster_offset(bs, sector_num << 9, 2, |
772 | ea2384d3 | bellard | out_len, 0, 0); |
773 | ea2384d3 | bellard | cluster_offset &= s->cluster_offset_mask; |
774 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
|
775 | 7267c094 | Anthony Liguori | g_free(out_buf); |
776 | ea2384d3 | bellard | return -1; |
777 | ea2384d3 | bellard | } |
778 | ea2384d3 | bellard | } |
779 | 3b46e624 | ths | |
780 | 7267c094 | Anthony Liguori | g_free(out_buf); |
781 | ea2384d3 | bellard | return 0; |
782 | ea2384d3 | bellard | } |
783 | ea2384d3 | bellard | |
784 | 205ef796 | Kevin Wolf | static int qcow_flush(BlockDriverState *bs) |
785 | 7a6cba61 | pbrook | { |
786 | 205ef796 | Kevin Wolf | return bdrv_flush(bs->file);
|
787 | 7a6cba61 | pbrook | } |
788 | 7a6cba61 | pbrook | |
789 | f8012c13 | Kevin Wolf | static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
|
790 | f8012c13 | Kevin Wolf | BlockDriverCompletionFunc *cb, void *opaque)
|
791 | f8012c13 | Kevin Wolf | { |
792 | 66f82cee | Kevin Wolf | return bdrv_aio_flush(bs->file, cb, opaque);
|
793 | f8012c13 | Kevin Wolf | } |
794 | f8012c13 | Kevin Wolf | |
795 | c47c33b0 | bellard | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
796 | c47c33b0 | bellard | { |
797 | c47c33b0 | bellard | BDRVQcowState *s = bs->opaque; |
798 | c47c33b0 | bellard | bdi->cluster_size = s->cluster_size; |
799 | c47c33b0 | bellard | return 0; |
800 | c47c33b0 | bellard | } |
801 | c47c33b0 | bellard | |
802 | 0e7e1989 | Kevin Wolf | |
803 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter qcow_create_options[] = {
|
804 | db08adf5 | Kevin Wolf | { |
805 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
806 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
807 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
808 | db08adf5 | Kevin Wolf | }, |
809 | db08adf5 | Kevin Wolf | { |
810 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FILE, |
811 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
812 | db08adf5 | Kevin Wolf | .help = "File name of a base image"
|
813 | db08adf5 | Kevin Wolf | }, |
814 | db08adf5 | Kevin Wolf | { |
815 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_ENCRYPT, |
816 | db08adf5 | Kevin Wolf | .type = OPT_FLAG, |
817 | db08adf5 | Kevin Wolf | .help = "Encrypt the image"
|
818 | db08adf5 | Kevin Wolf | }, |
819 | 0e7e1989 | Kevin Wolf | { NULL }
|
820 | 0e7e1989 | Kevin Wolf | }; |
821 | 0e7e1989 | Kevin Wolf | |
822 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_qcow = {
|
823 | e60f469c | aurel32 | .format_name = "qcow",
|
824 | e60f469c | aurel32 | .instance_size = sizeof(BDRVQcowState),
|
825 | e60f469c | aurel32 | .bdrv_probe = qcow_probe, |
826 | e60f469c | aurel32 | .bdrv_open = qcow_open, |
827 | e60f469c | aurel32 | .bdrv_close = qcow_close, |
828 | e60f469c | aurel32 | .bdrv_create = qcow_create, |
829 | e60f469c | aurel32 | .bdrv_flush = qcow_flush, |
830 | e60f469c | aurel32 | .bdrv_is_allocated = qcow_is_allocated, |
831 | e60f469c | aurel32 | .bdrv_set_key = qcow_set_key, |
832 | e60f469c | aurel32 | .bdrv_make_empty = qcow_make_empty, |
833 | 52b8eb60 | Kevin Wolf | .bdrv_co_readv = qcow_co_readv, |
834 | 52b8eb60 | Kevin Wolf | .bdrv_co_writev = qcow_co_writev, |
835 | f8012c13 | Kevin Wolf | .bdrv_aio_flush = qcow_aio_flush, |
836 | c47c33b0 | bellard | .bdrv_write_compressed = qcow_write_compressed, |
837 | e60f469c | aurel32 | .bdrv_get_info = qcow_get_info, |
838 | 0e7e1989 | Kevin Wolf | |
839 | 0e7e1989 | Kevin Wolf | .create_options = qcow_create_options, |
840 | ea2384d3 | bellard | }; |
841 | 5efa9d5a | Anthony Liguori | |
842 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow_init(void) |
843 | 5efa9d5a | Anthony Liguori | { |
844 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow); |
845 | 5efa9d5a | Anthony Liguori | } |
846 | 5efa9d5a | Anthony Liguori | |
847 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow_init); |