root / block / qcow2.c @ 2000cbc5
History | View | Annotate | Download (32.3 kB)
1 | 585f8587 | bellard | /*
|
---|---|---|---|
2 | 585f8587 | bellard | * Block driver for the QCOW version 2 format
|
3 | 5fafdf24 | ths | *
|
4 | 585f8587 | bellard | * Copyright (c) 2004-2006 Fabrice Bellard
|
5 | 5fafdf24 | ths | *
|
6 | 585f8587 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
|
7 | 585f8587 | bellard | * of this software and associated documentation files (the "Software"), to deal
|
8 | 585f8587 | bellard | * in the Software without restriction, including without limitation the rights
|
9 | 585f8587 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
10 | 585f8587 | bellard | * copies of the Software, and to permit persons to whom the Software is
|
11 | 585f8587 | bellard | * furnished to do so, subject to the following conditions:
|
12 | 585f8587 | bellard | *
|
13 | 585f8587 | bellard | * The above copyright notice and this permission notice shall be included in
|
14 | 585f8587 | bellard | * all copies or substantial portions of the Software.
|
15 | 585f8587 | bellard | *
|
16 | 585f8587 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
17 | 585f8587 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
18 | 585f8587 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
19 | 585f8587 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
20 | 585f8587 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
21 | 585f8587 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
22 | 585f8587 | bellard | * THE SOFTWARE.
|
23 | 585f8587 | bellard | */
|
24 | faf07963 | pbrook | #include "qemu-common.h" |
25 | 585f8587 | bellard | #include "block_int.h" |
26 | 5efa9d5a | Anthony Liguori | #include "module.h" |
27 | 585f8587 | bellard | #include <zlib.h> |
28 | 585f8587 | bellard | #include "aes.h" |
29 | f7d0fe02 | Kevin Wolf | #include "block/qcow2.h" |
30 | 585f8587 | bellard | |
31 | 585f8587 | bellard | /*
|
32 | 585f8587 | bellard | Differences with QCOW:
|
33 | 585f8587 | bellard | |
34 | 585f8587 | bellard | - Support for multiple incremental snapshots.
|
35 | 585f8587 | bellard | - Memory management by reference counts.
|
36 | 585f8587 | bellard | - Clusters which have a reference count of one have the bit
|
37 | 585f8587 | bellard | QCOW_OFLAG_COPIED to optimize write performance.
|
38 | 5fafdf24 | ths | - Size of compressed clusters is stored in sectors to reduce bit usage
|
39 | 585f8587 | bellard | in the cluster offsets.
|
40 | 585f8587 | bellard | - Support for storing additional data (such as the VM state) in the
|
41 | 3b46e624 | ths | snapshots.
|
42 | 585f8587 | bellard | - If a backing store is used, the cluster size is not constrained
|
43 | 585f8587 | bellard | (could be backported to QCOW).
|
44 | 585f8587 | bellard | - L2 tables have always a size of one cluster.
|
45 | 585f8587 | bellard | */
|
46 | 585f8587 | bellard | |
47 | 9b80ddf3 | aliguori | |
48 | 9b80ddf3 | aliguori | typedef struct { |
49 | 9b80ddf3 | aliguori | uint32_t magic; |
50 | 9b80ddf3 | aliguori | uint32_t len; |
51 | 9b80ddf3 | aliguori | } QCowExtension; |
52 | 9b80ddf3 | aliguori | #define QCOW_EXT_MAGIC_END 0 |
53 | f965509c | aliguori | #define QCOW_EXT_MAGIC_BACKING_FORMAT 0xE2792ACA |
54 | 9b80ddf3 | aliguori | |
55 | 9b80ddf3 | aliguori | |
56 | 585f8587 | bellard | |
57 | 585f8587 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
58 | 585f8587 | bellard | { |
59 | 585f8587 | bellard | const QCowHeader *cow_header = (const void *)buf; |
60 | 3b46e624 | ths | |
61 | 585f8587 | bellard | if (buf_size >= sizeof(QCowHeader) && |
62 | 585f8587 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
63 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
64 | 585f8587 | bellard | return 100; |
65 | 585f8587 | bellard | else
|
66 | 585f8587 | bellard | return 0; |
67 | 585f8587 | bellard | } |
68 | 585f8587 | bellard | |
69 | 9b80ddf3 | aliguori | |
70 | 9b80ddf3 | aliguori | /*
|
71 | 9b80ddf3 | aliguori | * read qcow2 extension and fill bs
|
72 | 9b80ddf3 | aliguori | * start reading from start_offset
|
73 | 9b80ddf3 | aliguori | * finish reading upon magic of value 0 or when end_offset reached
|
74 | 9b80ddf3 | aliguori | * unknown magic is skipped (future extension this version knows nothing about)
|
75 | 9b80ddf3 | aliguori | * return 0 upon success, non-0 otherwise
|
76 | 9b80ddf3 | aliguori | */
|
77 | 9b80ddf3 | aliguori | static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
78 | 9b80ddf3 | aliguori | uint64_t end_offset) |
79 | 9b80ddf3 | aliguori | { |
80 | 9b80ddf3 | aliguori | BDRVQcowState *s = bs->opaque; |
81 | 9b80ddf3 | aliguori | QCowExtension ext; |
82 | 9b80ddf3 | aliguori | uint64_t offset; |
83 | 9b80ddf3 | aliguori | |
84 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
85 | 9b80ddf3 | aliguori | printf("qcow_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
|
86 | 9b80ddf3 | aliguori | #endif
|
87 | 9b80ddf3 | aliguori | offset = start_offset; |
88 | 9b80ddf3 | aliguori | while (offset < end_offset) {
|
89 | 9b80ddf3 | aliguori | |
90 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
91 | 9b80ddf3 | aliguori | /* Sanity check */
|
92 | 9b80ddf3 | aliguori | if (offset > s->cluster_size)
|
93 | 9b80ddf3 | aliguori | printf("qcow_handle_extension: suspicious offset %lu\n", offset);
|
94 | 9b80ddf3 | aliguori | |
95 | 9b80ddf3 | aliguori | printf("attemting to read extended header in offset %lu\n", offset);
|
96 | 9b80ddf3 | aliguori | #endif
|
97 | 9b80ddf3 | aliguori | |
98 | 9b80ddf3 | aliguori | if (bdrv_pread(s->hd, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
99 | 4c978075 | aliguori | fprintf(stderr, "qcow_handle_extension: ERROR: pread fail from offset %llu\n",
|
100 | 4c978075 | aliguori | (unsigned long long)offset); |
101 | 9b80ddf3 | aliguori | return 1; |
102 | 9b80ddf3 | aliguori | } |
103 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.magic); |
104 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.len); |
105 | 9b80ddf3 | aliguori | offset += sizeof(ext);
|
106 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
107 | 9b80ddf3 | aliguori | printf("ext.magic = 0x%x\n", ext.magic);
|
108 | 9b80ddf3 | aliguori | #endif
|
109 | 9b80ddf3 | aliguori | switch (ext.magic) {
|
110 | 9b80ddf3 | aliguori | case QCOW_EXT_MAGIC_END:
|
111 | 9b80ddf3 | aliguori | return 0; |
112 | f965509c | aliguori | |
113 | f965509c | aliguori | case QCOW_EXT_MAGIC_BACKING_FORMAT:
|
114 | f965509c | aliguori | if (ext.len >= sizeof(bs->backing_format)) { |
115 | f965509c | aliguori | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
|
116 | 4c978075 | aliguori | " (>=%zu)\n",
|
117 | f965509c | aliguori | ext.len, sizeof(bs->backing_format));
|
118 | f965509c | aliguori | return 2; |
119 | f965509c | aliguori | } |
120 | f965509c | aliguori | if (bdrv_pread(s->hd, offset , bs->backing_format,
|
121 | f965509c | aliguori | ext.len) != ext.len) |
122 | f965509c | aliguori | return 3; |
123 | f965509c | aliguori | bs->backing_format[ext.len] = '\0';
|
124 | f965509c | aliguori | #ifdef DEBUG_EXT
|
125 | f965509c | aliguori | printf("Qcow2: Got format extension %s\n", bs->backing_format);
|
126 | f965509c | aliguori | #endif
|
127 | f965509c | aliguori | offset += ((ext.len + 7) & ~7); |
128 | f965509c | aliguori | break;
|
129 | f965509c | aliguori | |
130 | 9b80ddf3 | aliguori | default:
|
131 | 9b80ddf3 | aliguori | /* unknown magic -- just skip it */
|
132 | 9b80ddf3 | aliguori | offset += ((ext.len + 7) & ~7); |
133 | 9b80ddf3 | aliguori | break;
|
134 | 9b80ddf3 | aliguori | } |
135 | 9b80ddf3 | aliguori | } |
136 | 9b80ddf3 | aliguori | |
137 | 9b80ddf3 | aliguori | return 0; |
138 | 9b80ddf3 | aliguori | } |
139 | 9b80ddf3 | aliguori | |
140 | 9b80ddf3 | aliguori | |
141 | 585f8587 | bellard | static int qcow_open(BlockDriverState *bs, const char *filename, int flags) |
142 | 585f8587 | bellard | { |
143 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
144 | 585f8587 | bellard | int len, i, shift, ret;
|
145 | 585f8587 | bellard | QCowHeader header; |
146 | 9b80ddf3 | aliguori | uint64_t ext_end; |
147 | 585f8587 | bellard | |
148 | b5eff355 | aurel32 | ret = bdrv_file_open(&s->hd, filename, flags); |
149 | 585f8587 | bellard | if (ret < 0) |
150 | 585f8587 | bellard | return ret;
|
151 | 585f8587 | bellard | if (bdrv_pread(s->hd, 0, &header, sizeof(header)) != sizeof(header)) |
152 | 585f8587 | bellard | goto fail;
|
153 | 585f8587 | bellard | be32_to_cpus(&header.magic); |
154 | 585f8587 | bellard | be32_to_cpus(&header.version); |
155 | 585f8587 | bellard | be64_to_cpus(&header.backing_file_offset); |
156 | 585f8587 | bellard | be32_to_cpus(&header.backing_file_size); |
157 | 585f8587 | bellard | be64_to_cpus(&header.size); |
158 | 585f8587 | bellard | be32_to_cpus(&header.cluster_bits); |
159 | 585f8587 | bellard | be32_to_cpus(&header.crypt_method); |
160 | 585f8587 | bellard | be64_to_cpus(&header.l1_table_offset); |
161 | 585f8587 | bellard | be32_to_cpus(&header.l1_size); |
162 | 585f8587 | bellard | be64_to_cpus(&header.refcount_table_offset); |
163 | 585f8587 | bellard | be32_to_cpus(&header.refcount_table_clusters); |
164 | 585f8587 | bellard | be64_to_cpus(&header.snapshots_offset); |
165 | 585f8587 | bellard | be32_to_cpus(&header.nb_snapshots); |
166 | 3b46e624 | ths | |
167 | 585f8587 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
|
168 | 585f8587 | bellard | goto fail;
|
169 | 5fafdf24 | ths | if (header.size <= 1 || |
170 | 73c632ed | Kevin Wolf | header.cluster_bits < MIN_CLUSTER_BITS || |
171 | 73c632ed | Kevin Wolf | header.cluster_bits > MAX_CLUSTER_BITS) |
172 | 585f8587 | bellard | goto fail;
|
173 | 585f8587 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
|
174 | 585f8587 | bellard | goto fail;
|
175 | 585f8587 | bellard | s->crypt_method_header = header.crypt_method; |
176 | 585f8587 | bellard | if (s->crypt_method_header)
|
177 | 585f8587 | bellard | bs->encrypted = 1;
|
178 | 585f8587 | bellard | s->cluster_bits = header.cluster_bits; |
179 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
180 | 585f8587 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
181 | 585f8587 | bellard | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
182 | 585f8587 | bellard | s->l2_size = 1 << s->l2_bits;
|
183 | 585f8587 | bellard | bs->total_sectors = header.size / 512;
|
184 | 585f8587 | bellard | s->csize_shift = (62 - (s->cluster_bits - 8)); |
185 | 585f8587 | bellard | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
186 | 585f8587 | bellard | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
187 | 585f8587 | bellard | s->refcount_table_offset = header.refcount_table_offset; |
188 | 5fafdf24 | ths | s->refcount_table_size = |
189 | 585f8587 | bellard | header.refcount_table_clusters << (s->cluster_bits - 3);
|
190 | 585f8587 | bellard | |
191 | 585f8587 | bellard | s->snapshots_offset = header.snapshots_offset; |
192 | 585f8587 | bellard | s->nb_snapshots = header.nb_snapshots; |
193 | 585f8587 | bellard | |
194 | 585f8587 | bellard | /* read the level 1 table */
|
195 | 585f8587 | bellard | s->l1_size = header.l1_size; |
196 | 585f8587 | bellard | shift = s->cluster_bits + s->l2_bits; |
197 | 585f8587 | bellard | s->l1_vm_state_index = (header.size + (1LL << shift) - 1) >> shift; |
198 | 585f8587 | bellard | /* the L1 table must contain at least enough entries to put
|
199 | 585f8587 | bellard | header.size bytes */
|
200 | 585f8587 | bellard | if (s->l1_size < s->l1_vm_state_index)
|
201 | 585f8587 | bellard | goto fail;
|
202 | 585f8587 | bellard | s->l1_table_offset = header.l1_table_offset; |
203 | 3f6a3ee5 | Kevin Wolf | s->l1_table = qemu_mallocz( |
204 | 3f6a3ee5 | Kevin Wolf | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
205 | 5fafdf24 | ths | if (bdrv_pread(s->hd, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
206 | 585f8587 | bellard | s->l1_size * sizeof(uint64_t))
|
207 | 585f8587 | bellard | goto fail;
|
208 | 585f8587 | bellard | for(i = 0;i < s->l1_size; i++) { |
209 | 585f8587 | bellard | be64_to_cpus(&s->l1_table[i]); |
210 | 585f8587 | bellard | } |
211 | 585f8587 | bellard | /* alloc L2 cache */
|
212 | 585f8587 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
|
213 | 585f8587 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
214 | 585f8587 | bellard | /* one more sector for decompressed data alignment */
|
215 | 095a9c58 | aliguori | s->cluster_data = qemu_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
216 | 095a9c58 | aliguori | + 512);
|
217 | 585f8587 | bellard | s->cluster_cache_offset = -1;
|
218 | 3b46e624 | ths | |
219 | ed6ccf0f | Kevin Wolf | if (qcow2_refcount_init(bs) < 0) |
220 | 585f8587 | bellard | goto fail;
|
221 | 585f8587 | bellard | |
222 | 9b80ddf3 | aliguori | /* read qcow2 extensions */
|
223 | 9b80ddf3 | aliguori | if (header.backing_file_offset)
|
224 | 9b80ddf3 | aliguori | ext_end = header.backing_file_offset; |
225 | 9b80ddf3 | aliguori | else
|
226 | 9b80ddf3 | aliguori | ext_end = s->cluster_size; |
227 | 9b80ddf3 | aliguori | if (qcow_read_extensions(bs, sizeof(header), ext_end)) |
228 | 9b80ddf3 | aliguori | goto fail;
|
229 | 9b80ddf3 | aliguori | |
230 | 585f8587 | bellard | /* read the backing file name */
|
231 | 585f8587 | bellard | if (header.backing_file_offset != 0) { |
232 | 585f8587 | bellard | len = header.backing_file_size; |
233 | 585f8587 | bellard | if (len > 1023) |
234 | 585f8587 | bellard | len = 1023;
|
235 | 585f8587 | bellard | if (bdrv_pread(s->hd, header.backing_file_offset, bs->backing_file, len) != len)
|
236 | 585f8587 | bellard | goto fail;
|
237 | 585f8587 | bellard | bs->backing_file[len] = '\0';
|
238 | 585f8587 | bellard | } |
239 | ed6ccf0f | Kevin Wolf | if (qcow2_read_snapshots(bs) < 0) |
240 | 585f8587 | bellard | goto fail;
|
241 | 585f8587 | bellard | |
242 | 585f8587 | bellard | #ifdef DEBUG_ALLOC
|
243 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
244 | 585f8587 | bellard | #endif
|
245 | 585f8587 | bellard | return 0; |
246 | 585f8587 | bellard | |
247 | 585f8587 | bellard | fail:
|
248 | ed6ccf0f | Kevin Wolf | qcow2_free_snapshots(bs); |
249 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
250 | 585f8587 | bellard | qemu_free(s->l1_table); |
251 | 585f8587 | bellard | qemu_free(s->l2_cache); |
252 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
253 | 585f8587 | bellard | qemu_free(s->cluster_data); |
254 | 585f8587 | bellard | bdrv_delete(s->hd); |
255 | 585f8587 | bellard | return -1; |
256 | 585f8587 | bellard | } |
257 | 585f8587 | bellard | |
258 | 585f8587 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
259 | 585f8587 | bellard | { |
260 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
261 | 585f8587 | bellard | uint8_t keybuf[16];
|
262 | 585f8587 | bellard | int len, i;
|
263 | 3b46e624 | ths | |
264 | 585f8587 | bellard | memset(keybuf, 0, 16); |
265 | 585f8587 | bellard | len = strlen(key); |
266 | 585f8587 | bellard | if (len > 16) |
267 | 585f8587 | bellard | len = 16;
|
268 | 585f8587 | bellard | /* XXX: we could compress the chars to 7 bits to increase
|
269 | 585f8587 | bellard | entropy */
|
270 | 585f8587 | bellard | for(i = 0;i < len;i++) { |
271 | 585f8587 | bellard | keybuf[i] = key[i]; |
272 | 585f8587 | bellard | } |
273 | 585f8587 | bellard | s->crypt_method = s->crypt_method_header; |
274 | 585f8587 | bellard | |
275 | 585f8587 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
276 | 585f8587 | bellard | return -1; |
277 | 585f8587 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
278 | 585f8587 | bellard | return -1; |
279 | 585f8587 | bellard | #if 0
|
280 | 585f8587 | bellard | /* test */
|
281 | 585f8587 | bellard | {
|
282 | 585f8587 | bellard | uint8_t in[16];
|
283 | 585f8587 | bellard | uint8_t out[16];
|
284 | 585f8587 | bellard | uint8_t tmp[16];
|
285 | 585f8587 | bellard | for(i=0;i<16;i++)
|
286 | 585f8587 | bellard | in[i] = i;
|
287 | 585f8587 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
|
288 | 585f8587 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
|
289 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
290 | 585f8587 | bellard | printf(" %02x", tmp[i]);
|
291 | 585f8587 | bellard | printf("\n");
|
292 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
293 | 585f8587 | bellard | printf(" %02x", out[i]);
|
294 | 585f8587 | bellard | printf("\n");
|
295 | 585f8587 | bellard | }
|
296 | 585f8587 | bellard | #endif
|
297 | 585f8587 | bellard | return 0; |
298 | 585f8587 | bellard | } |
299 | 585f8587 | bellard | |
300 | 5fafdf24 | ths | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
301 | 585f8587 | bellard | int nb_sectors, int *pnum) |
302 | 585f8587 | bellard | { |
303 | 585f8587 | bellard | uint64_t cluster_offset; |
304 | 585f8587 | bellard | |
305 | 095a9c58 | aliguori | *pnum = nb_sectors; |
306 | ed6ccf0f | Kevin Wolf | cluster_offset = qcow2_get_cluster_offset(bs, sector_num << 9, pnum);
|
307 | 095a9c58 | aliguori | |
308 | 585f8587 | bellard | return (cluster_offset != 0); |
309 | 585f8587 | bellard | } |
310 | 585f8587 | bellard | |
311 | a9465922 | bellard | /* handle reading after the end of the backing file */
|
312 | ed6ccf0f | Kevin Wolf | int qcow2_backing_read1(BlockDriverState *bs,
|
313 | 45aba42f | Kevin Wolf | int64_t sector_num, uint8_t *buf, int nb_sectors)
|
314 | a9465922 | bellard | { |
315 | a9465922 | bellard | int n1;
|
316 | a9465922 | bellard | if ((sector_num + nb_sectors) <= bs->total_sectors)
|
317 | a9465922 | bellard | return nb_sectors;
|
318 | a9465922 | bellard | if (sector_num >= bs->total_sectors)
|
319 | a9465922 | bellard | n1 = 0;
|
320 | a9465922 | bellard | else
|
321 | a9465922 | bellard | n1 = bs->total_sectors - sector_num; |
322 | a9465922 | bellard | memset(buf + n1 * 512, 0, 512 * (nb_sectors - n1)); |
323 | a9465922 | bellard | return n1;
|
324 | a9465922 | bellard | } |
325 | a9465922 | bellard | |
326 | ce1a14dc | pbrook | typedef struct QCowAIOCB { |
327 | ce1a14dc | pbrook | BlockDriverAIOCB common; |
328 | 585f8587 | bellard | int64_t sector_num; |
329 | f141eafe | aliguori | QEMUIOVector *qiov; |
330 | 585f8587 | bellard | uint8_t *buf; |
331 | f141eafe | aliguori | void *orig_buf;
|
332 | 585f8587 | bellard | int nb_sectors;
|
333 | 585f8587 | bellard | int n;
|
334 | 585f8587 | bellard | uint64_t cluster_offset; |
335 | 5fafdf24 | ths | uint8_t *cluster_data; |
336 | 585f8587 | bellard | BlockDriverAIOCB *hd_aiocb; |
337 | c87c0672 | aliguori | struct iovec hd_iov;
|
338 | c87c0672 | aliguori | QEMUIOVector hd_qiov; |
339 | 1490791f | aliguori | QEMUBH *bh; |
340 | e976c6a1 | aliguori | QCowL2Meta l2meta; |
341 | 585f8587 | bellard | } QCowAIOCB; |
342 | 585f8587 | bellard | |
343 | c16b5a2c | Christoph Hellwig | static void qcow_aio_cancel(BlockDriverAIOCB *blockacb) |
344 | c16b5a2c | Christoph Hellwig | { |
345 | c16b5a2c | Christoph Hellwig | QCowAIOCB *acb = (QCowAIOCB *)blockacb; |
346 | c16b5a2c | Christoph Hellwig | if (acb->hd_aiocb)
|
347 | c16b5a2c | Christoph Hellwig | bdrv_aio_cancel(acb->hd_aiocb); |
348 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
349 | c16b5a2c | Christoph Hellwig | } |
350 | c16b5a2c | Christoph Hellwig | |
351 | c16b5a2c | Christoph Hellwig | static AIOPool qcow_aio_pool = {
|
352 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(QCowAIOCB),
|
353 | c16b5a2c | Christoph Hellwig | .cancel = qcow_aio_cancel, |
354 | c16b5a2c | Christoph Hellwig | }; |
355 | c16b5a2c | Christoph Hellwig | |
356 | 1490791f | aliguori | static void qcow_aio_read_cb(void *opaque, int ret); |
357 | 1490791f | aliguori | static void qcow_aio_read_bh(void *opaque) |
358 | 1490791f | aliguori | { |
359 | 1490791f | aliguori | QCowAIOCB *acb = opaque; |
360 | 1490791f | aliguori | qemu_bh_delete(acb->bh); |
361 | 1490791f | aliguori | acb->bh = NULL;
|
362 | 1490791f | aliguori | qcow_aio_read_cb(opaque, 0);
|
363 | 1490791f | aliguori | } |
364 | 1490791f | aliguori | |
365 | a32ef786 | aliguori | static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb) |
366 | a32ef786 | aliguori | { |
367 | a32ef786 | aliguori | if (acb->bh)
|
368 | a32ef786 | aliguori | return -EIO;
|
369 | a32ef786 | aliguori | |
370 | a32ef786 | aliguori | acb->bh = qemu_bh_new(cb, acb); |
371 | a32ef786 | aliguori | if (!acb->bh)
|
372 | a32ef786 | aliguori | return -EIO;
|
373 | a32ef786 | aliguori | |
374 | a32ef786 | aliguori | qemu_bh_schedule(acb->bh); |
375 | a32ef786 | aliguori | |
376 | a32ef786 | aliguori | return 0; |
377 | a32ef786 | aliguori | } |
378 | a32ef786 | aliguori | |
379 | 585f8587 | bellard | static void qcow_aio_read_cb(void *opaque, int ret) |
380 | 585f8587 | bellard | { |
381 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
382 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
383 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
384 | a9465922 | bellard | int index_in_cluster, n1;
|
385 | 585f8587 | bellard | |
386 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
387 | f141eafe | aliguori | if (ret < 0) |
388 | f141eafe | aliguori | goto done;
|
389 | 585f8587 | bellard | |
390 | 585f8587 | bellard | /* post process the read buffer */
|
391 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
392 | 585f8587 | bellard | /* nothing to do */
|
393 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
394 | 585f8587 | bellard | /* nothing to do */
|
395 | 585f8587 | bellard | } else {
|
396 | 585f8587 | bellard | if (s->crypt_method) {
|
397 | ed6ccf0f | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
398 | 5fafdf24 | ths | acb->n, 0,
|
399 | 585f8587 | bellard | &s->aes_decrypt_key); |
400 | 585f8587 | bellard | } |
401 | 585f8587 | bellard | } |
402 | 585f8587 | bellard | |
403 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
404 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
405 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
406 | 585f8587 | bellard | |
407 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
408 | 585f8587 | bellard | /* request completed */
|
409 | f141eafe | aliguori | ret = 0;
|
410 | f141eafe | aliguori | goto done;
|
411 | 585f8587 | bellard | } |
412 | 3b46e624 | ths | |
413 | 585f8587 | bellard | /* prepare next AIO request */
|
414 | 095a9c58 | aliguori | acb->n = acb->nb_sectors; |
415 | ed6ccf0f | Kevin Wolf | acb->cluster_offset = |
416 | ed6ccf0f | Kevin Wolf | qcow2_get_cluster_offset(bs, acb->sector_num << 9, &acb->n);
|
417 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
418 | ce1a14dc | pbrook | |
419 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
420 | 585f8587 | bellard | if (bs->backing_hd) {
|
421 | 585f8587 | bellard | /* read from the base image */
|
422 | ed6ccf0f | Kevin Wolf | n1 = qcow2_backing_read1(bs->backing_hd, acb->sector_num, |
423 | ce1a14dc | pbrook | acb->buf, acb->n); |
424 | a9465922 | bellard | if (n1 > 0) { |
425 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
426 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
427 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
428 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, |
429 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, |
430 | c87c0672 | aliguori | qcow_aio_read_cb, acb); |
431 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
432 | f141eafe | aliguori | goto done;
|
433 | a9465922 | bellard | } else {
|
434 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
435 | a32ef786 | aliguori | if (ret < 0) |
436 | f141eafe | aliguori | goto done;
|
437 | a9465922 | bellard | } |
438 | 585f8587 | bellard | } else {
|
439 | 585f8587 | bellard | /* Note: in this case, no need to wait */
|
440 | ce1a14dc | pbrook | memset(acb->buf, 0, 512 * acb->n); |
441 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
442 | a32ef786 | aliguori | if (ret < 0) |
443 | f141eafe | aliguori | goto done;
|
444 | 585f8587 | bellard | } |
445 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
446 | 585f8587 | bellard | /* add AIO support for compressed blocks ? */
|
447 | ed6ccf0f | Kevin Wolf | if (qcow2_decompress_cluster(s, acb->cluster_offset) < 0) |
448 | f141eafe | aliguori | goto done;
|
449 | 5fafdf24 | ths | memcpy(acb->buf, |
450 | ce1a14dc | pbrook | s->cluster_cache + index_in_cluster * 512, 512 * acb->n); |
451 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
452 | a32ef786 | aliguori | if (ret < 0) |
453 | f141eafe | aliguori | goto done;
|
454 | 585f8587 | bellard | } else {
|
455 | ce1a14dc | pbrook | if ((acb->cluster_offset & 511) != 0) { |
456 | 585f8587 | bellard | ret = -EIO; |
457 | f141eafe | aliguori | goto done;
|
458 | 585f8587 | bellard | } |
459 | c87c0672 | aliguori | |
460 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
461 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
462 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
463 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(s->hd, |
464 | 5fafdf24 | ths | (acb->cluster_offset >> 9) + index_in_cluster,
|
465 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, qcow_aio_read_cb, acb); |
466 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
467 | f141eafe | aliguori | goto done;
|
468 | f141eafe | aliguori | } |
469 | f141eafe | aliguori | |
470 | f141eafe | aliguori | return;
|
471 | f141eafe | aliguori | done:
|
472 | f141eafe | aliguori | if (acb->qiov->niov > 1) { |
473 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); |
474 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
475 | 585f8587 | bellard | } |
476 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
477 | f141eafe | aliguori | qemu_aio_release(acb); |
478 | 585f8587 | bellard | } |
479 | 585f8587 | bellard | |
480 | ce1a14dc | pbrook | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
|
481 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
482 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque, int is_write) |
483 | 585f8587 | bellard | { |
484 | ce1a14dc | pbrook | QCowAIOCB *acb; |
485 | ce1a14dc | pbrook | |
486 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque); |
487 | ce1a14dc | pbrook | if (!acb)
|
488 | ce1a14dc | pbrook | return NULL; |
489 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
490 | ce1a14dc | pbrook | acb->sector_num = sector_num; |
491 | f141eafe | aliguori | acb->qiov = qiov; |
492 | f141eafe | aliguori | if (qiov->niov > 1) { |
493 | e268ca52 | aliguori | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); |
494 | f141eafe | aliguori | if (is_write)
|
495 | f141eafe | aliguori | qemu_iovec_to_buffer(qiov, acb->buf); |
496 | 3f4cb3d3 | blueswir1 | } else {
|
497 | 3f4cb3d3 | blueswir1 | acb->buf = (uint8_t *)qiov->iov->iov_base; |
498 | 3f4cb3d3 | blueswir1 | } |
499 | ce1a14dc | pbrook | acb->nb_sectors = nb_sectors; |
500 | ce1a14dc | pbrook | acb->n = 0;
|
501 | ce1a14dc | pbrook | acb->cluster_offset = 0;
|
502 | e976c6a1 | aliguori | acb->l2meta.nb_clusters = 0;
|
503 | ce1a14dc | pbrook | return acb;
|
504 | ce1a14dc | pbrook | } |
505 | ce1a14dc | pbrook | |
506 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
|
507 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
508 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
509 | ce1a14dc | pbrook | { |
510 | ce1a14dc | pbrook | QCowAIOCB *acb; |
511 | ce1a14dc | pbrook | |
512 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
513 | ce1a14dc | pbrook | if (!acb)
|
514 | ce1a14dc | pbrook | return NULL; |
515 | 585f8587 | bellard | |
516 | 585f8587 | bellard | qcow_aio_read_cb(acb, 0);
|
517 | ce1a14dc | pbrook | return &acb->common;
|
518 | 585f8587 | bellard | } |
519 | 585f8587 | bellard | |
520 | 585f8587 | bellard | static void qcow_aio_write_cb(void *opaque, int ret) |
521 | 585f8587 | bellard | { |
522 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
523 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
524 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
525 | 585f8587 | bellard | int index_in_cluster;
|
526 | 585f8587 | bellard | const uint8_t *src_buf;
|
527 | 095a9c58 | aliguori | int n_end;
|
528 | ce1a14dc | pbrook | |
529 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
530 | ce1a14dc | pbrook | |
531 | f141eafe | aliguori | if (ret < 0) |
532 | f141eafe | aliguori | goto done;
|
533 | 585f8587 | bellard | |
534 | ed6ccf0f | Kevin Wolf | if (qcow2_alloc_cluster_link_l2(bs, acb->cluster_offset, &acb->l2meta) < 0) { |
535 | ed6ccf0f | Kevin Wolf | qcow2_free_any_clusters(bs, acb->cluster_offset, acb->l2meta.nb_clusters); |
536 | f141eafe | aliguori | goto done;
|
537 | e976c6a1 | aliguori | } |
538 | e976c6a1 | aliguori | |
539 | ce1a14dc | pbrook | acb->nb_sectors -= acb->n; |
540 | ce1a14dc | pbrook | acb->sector_num += acb->n; |
541 | ce1a14dc | pbrook | acb->buf += acb->n * 512;
|
542 | 585f8587 | bellard | |
543 | ce1a14dc | pbrook | if (acb->nb_sectors == 0) { |
544 | 585f8587 | bellard | /* request completed */
|
545 | f141eafe | aliguori | ret = 0;
|
546 | f141eafe | aliguori | goto done;
|
547 | 585f8587 | bellard | } |
548 | 3b46e624 | ths | |
549 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
550 | 095a9c58 | aliguori | n_end = index_in_cluster + acb->nb_sectors; |
551 | 095a9c58 | aliguori | if (s->crypt_method &&
|
552 | 095a9c58 | aliguori | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) |
553 | 095a9c58 | aliguori | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; |
554 | 095a9c58 | aliguori | |
555 | ed6ccf0f | Kevin Wolf | acb->cluster_offset = qcow2_alloc_cluster_offset(bs, acb->sector_num << 9,
|
556 | 05203524 | aliguori | index_in_cluster, |
557 | e976c6a1 | aliguori | n_end, &acb->n, &acb->l2meta); |
558 | e976c6a1 | aliguori | if (!acb->cluster_offset || (acb->cluster_offset & 511) != 0) { |
559 | 585f8587 | bellard | ret = -EIO; |
560 | f141eafe | aliguori | goto done;
|
561 | 585f8587 | bellard | } |
562 | 585f8587 | bellard | if (s->crypt_method) {
|
563 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
564 | 095a9c58 | aliguori | acb->cluster_data = qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * |
565 | 095a9c58 | aliguori | s->cluster_size); |
566 | 585f8587 | bellard | } |
567 | ed6ccf0f | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
568 | ce1a14dc | pbrook | acb->n, 1, &s->aes_encrypt_key);
|
569 | ce1a14dc | pbrook | src_buf = acb->cluster_data; |
570 | 585f8587 | bellard | } else {
|
571 | ce1a14dc | pbrook | src_buf = acb->buf; |
572 | 585f8587 | bellard | } |
573 | c87c0672 | aliguori | acb->hd_iov.iov_base = (void *)src_buf;
|
574 | c87c0672 | aliguori | acb->hd_iov.iov_len = acb->n * 512;
|
575 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
576 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_writev(s->hd, |
577 | c87c0672 | aliguori | (acb->cluster_offset >> 9) + index_in_cluster,
|
578 | c87c0672 | aliguori | &acb->hd_qiov, acb->n, |
579 | c87c0672 | aliguori | qcow_aio_write_cb, acb); |
580 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
581 | f141eafe | aliguori | goto done;
|
582 | f141eafe | aliguori | |
583 | f141eafe | aliguori | return;
|
584 | f141eafe | aliguori | |
585 | f141eafe | aliguori | done:
|
586 | f141eafe | aliguori | if (acb->qiov->niov > 1) |
587 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
588 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
589 | f141eafe | aliguori | qemu_aio_release(acb); |
590 | 585f8587 | bellard | } |
591 | 585f8587 | bellard | |
592 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
|
593 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
594 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
595 | 585f8587 | bellard | { |
596 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
597 | ce1a14dc | pbrook | QCowAIOCB *acb; |
598 | 3b46e624 | ths | |
599 | 585f8587 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
600 | 585f8587 | bellard | |
601 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
602 | ce1a14dc | pbrook | if (!acb)
|
603 | ce1a14dc | pbrook | return NULL; |
604 | 3b46e624 | ths | |
605 | 585f8587 | bellard | qcow_aio_write_cb(acb, 0);
|
606 | ce1a14dc | pbrook | return &acb->common;
|
607 | 585f8587 | bellard | } |
608 | 585f8587 | bellard | |
609 | 585f8587 | bellard | static void qcow_close(BlockDriverState *bs) |
610 | 585f8587 | bellard | { |
611 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
612 | 585f8587 | bellard | qemu_free(s->l1_table); |
613 | 585f8587 | bellard | qemu_free(s->l2_cache); |
614 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
615 | 585f8587 | bellard | qemu_free(s->cluster_data); |
616 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
617 | 585f8587 | bellard | bdrv_delete(s->hd); |
618 | 585f8587 | bellard | } |
619 | 585f8587 | bellard | |
620 | 73c632ed | Kevin Wolf | static int get_bits_from_size(size_t size) |
621 | 73c632ed | Kevin Wolf | { |
622 | 73c632ed | Kevin Wolf | int res = 0; |
623 | 73c632ed | Kevin Wolf | |
624 | 73c632ed | Kevin Wolf | if (size == 0) { |
625 | 73c632ed | Kevin Wolf | return -1; |
626 | 73c632ed | Kevin Wolf | } |
627 | 73c632ed | Kevin Wolf | |
628 | 73c632ed | Kevin Wolf | while (size != 1) { |
629 | 73c632ed | Kevin Wolf | /* Not a power of two */
|
630 | 73c632ed | Kevin Wolf | if (size & 1) { |
631 | 73c632ed | Kevin Wolf | return -1; |
632 | 73c632ed | Kevin Wolf | } |
633 | 73c632ed | Kevin Wolf | |
634 | 73c632ed | Kevin Wolf | size >>= 1;
|
635 | 73c632ed | Kevin Wolf | res++; |
636 | 73c632ed | Kevin Wolf | } |
637 | 73c632ed | Kevin Wolf | |
638 | 73c632ed | Kevin Wolf | return res;
|
639 | 73c632ed | Kevin Wolf | } |
640 | 73c632ed | Kevin Wolf | |
641 | a35e1c17 | Kevin Wolf | |
642 | a35e1c17 | Kevin Wolf | static int preallocate(BlockDriverState *bs) |
643 | a35e1c17 | Kevin Wolf | { |
644 | a35e1c17 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
645 | 2000cbc5 | Blue Swirl | uint64_t cluster_offset = 0;
|
646 | a35e1c17 | Kevin Wolf | uint64_t nb_sectors; |
647 | a35e1c17 | Kevin Wolf | uint64_t offset; |
648 | a35e1c17 | Kevin Wolf | int num;
|
649 | a35e1c17 | Kevin Wolf | QCowL2Meta meta; |
650 | a35e1c17 | Kevin Wolf | |
651 | a35e1c17 | Kevin Wolf | nb_sectors = bdrv_getlength(bs) >> 9;
|
652 | a35e1c17 | Kevin Wolf | offset = 0;
|
653 | a35e1c17 | Kevin Wolf | |
654 | a35e1c17 | Kevin Wolf | while (nb_sectors) {
|
655 | a35e1c17 | Kevin Wolf | num = MIN(nb_sectors, INT_MAX >> 9);
|
656 | a35e1c17 | Kevin Wolf | cluster_offset = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num,
|
657 | a35e1c17 | Kevin Wolf | &meta); |
658 | a35e1c17 | Kevin Wolf | |
659 | a35e1c17 | Kevin Wolf | if (cluster_offset == 0) { |
660 | a35e1c17 | Kevin Wolf | return -1; |
661 | a35e1c17 | Kevin Wolf | } |
662 | a35e1c17 | Kevin Wolf | |
663 | a35e1c17 | Kevin Wolf | if (qcow2_alloc_cluster_link_l2(bs, cluster_offset, &meta) < 0) { |
664 | a35e1c17 | Kevin Wolf | qcow2_free_any_clusters(bs, cluster_offset, meta.nb_clusters); |
665 | a35e1c17 | Kevin Wolf | return -1; |
666 | a35e1c17 | Kevin Wolf | } |
667 | a35e1c17 | Kevin Wolf | |
668 | a35e1c17 | Kevin Wolf | /* TODO Preallocate data if requested */
|
669 | a35e1c17 | Kevin Wolf | |
670 | a35e1c17 | Kevin Wolf | nb_sectors -= num; |
671 | a35e1c17 | Kevin Wolf | offset += num << 9;
|
672 | a35e1c17 | Kevin Wolf | } |
673 | a35e1c17 | Kevin Wolf | |
674 | a35e1c17 | Kevin Wolf | /*
|
675 | a35e1c17 | Kevin Wolf | * It is expected that the image file is large enough to actually contain
|
676 | a35e1c17 | Kevin Wolf | * all of the allocated clusters (otherwise we get failing reads after
|
677 | a35e1c17 | Kevin Wolf | * EOF). Extend the image to the last allocated sector.
|
678 | a35e1c17 | Kevin Wolf | */
|
679 | a35e1c17 | Kevin Wolf | if (cluster_offset != 0) { |
680 | a35e1c17 | Kevin Wolf | bdrv_truncate(s->hd, cluster_offset + (num << 9));
|
681 | a35e1c17 | Kevin Wolf | } |
682 | a35e1c17 | Kevin Wolf | |
683 | a35e1c17 | Kevin Wolf | return 0; |
684 | a35e1c17 | Kevin Wolf | } |
685 | a35e1c17 | Kevin Wolf | |
686 | f965509c | aliguori | static int qcow_create2(const char *filename, int64_t total_size, |
687 | f965509c | aliguori | const char *backing_file, const char *backing_format, |
688 | a35e1c17 | Kevin Wolf | int flags, size_t cluster_size, int prealloc) |
689 | 585f8587 | bellard | { |
690 | f965509c | aliguori | |
691 | 585f8587 | bellard | int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits;
|
692 | 2d2431f0 | aliguori | int ref_clusters, backing_format_len = 0; |
693 | 585f8587 | bellard | QCowHeader header; |
694 | 585f8587 | bellard | uint64_t tmp, offset; |
695 | 585f8587 | bellard | QCowCreateState s1, *s = &s1; |
696 | f965509c | aliguori | QCowExtension ext_bf = {0, 0}; |
697 | f965509c | aliguori | |
698 | 3b46e624 | ths | |
699 | 585f8587 | bellard | memset(s, 0, sizeof(*s)); |
700 | 585f8587 | bellard | |
701 | 585f8587 | bellard | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
702 | 585f8587 | bellard | if (fd < 0) |
703 | 585f8587 | bellard | return -1; |
704 | 585f8587 | bellard | memset(&header, 0, sizeof(header)); |
705 | 585f8587 | bellard | header.magic = cpu_to_be32(QCOW_MAGIC); |
706 | 585f8587 | bellard | header.version = cpu_to_be32(QCOW_VERSION); |
707 | 585f8587 | bellard | header.size = cpu_to_be64(total_size * 512);
|
708 | 585f8587 | bellard | header_size = sizeof(header);
|
709 | 585f8587 | bellard | backing_filename_len = 0;
|
710 | 585f8587 | bellard | if (backing_file) {
|
711 | f965509c | aliguori | if (backing_format) {
|
712 | f965509c | aliguori | ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT; |
713 | f965509c | aliguori | backing_format_len = strlen(backing_format); |
714 | f965509c | aliguori | ext_bf.len = (backing_format_len + 7) & ~7; |
715 | f965509c | aliguori | header_size += ((sizeof(ext_bf) + ext_bf.len + 7) & ~7); |
716 | f965509c | aliguori | } |
717 | 585f8587 | bellard | header.backing_file_offset = cpu_to_be64(header_size); |
718 | 585f8587 | bellard | backing_filename_len = strlen(backing_file); |
719 | 585f8587 | bellard | header.backing_file_size = cpu_to_be32(backing_filename_len); |
720 | 585f8587 | bellard | header_size += backing_filename_len; |
721 | 585f8587 | bellard | } |
722 | 73c632ed | Kevin Wolf | |
723 | 73c632ed | Kevin Wolf | /* Cluster size */
|
724 | 73c632ed | Kevin Wolf | s->cluster_bits = get_bits_from_size(cluster_size); |
725 | 73c632ed | Kevin Wolf | if (s->cluster_bits < MIN_CLUSTER_BITS ||
|
726 | 73c632ed | Kevin Wolf | s->cluster_bits > MAX_CLUSTER_BITS) |
727 | 73c632ed | Kevin Wolf | { |
728 | 73c632ed | Kevin Wolf | fprintf(stderr, "Cluster size must be a power of two between "
|
729 | 73c632ed | Kevin Wolf | "%d and %dk\n",
|
730 | 73c632ed | Kevin Wolf | 1 << MIN_CLUSTER_BITS,
|
731 | 73c632ed | Kevin Wolf | 1 << (MAX_CLUSTER_BITS - 10)); |
732 | 73c632ed | Kevin Wolf | return -EINVAL;
|
733 | 73c632ed | Kevin Wolf | } |
734 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
735 | 73c632ed | Kevin Wolf | |
736 | 585f8587 | bellard | header.cluster_bits = cpu_to_be32(s->cluster_bits); |
737 | 585f8587 | bellard | header_size = (header_size + 7) & ~7; |
738 | ec36ba14 | ths | if (flags & BLOCK_FLAG_ENCRYPT) {
|
739 | 585f8587 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
740 | 585f8587 | bellard | } else {
|
741 | 585f8587 | bellard | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
742 | 585f8587 | bellard | } |
743 | 585f8587 | bellard | l2_bits = s->cluster_bits - 3;
|
744 | 585f8587 | bellard | shift = s->cluster_bits + l2_bits; |
745 | 585f8587 | bellard | l1_size = (((total_size * 512) + (1LL << shift) - 1) >> shift); |
746 | 585f8587 | bellard | offset = align_offset(header_size, s->cluster_size); |
747 | 585f8587 | bellard | s->l1_table_offset = offset; |
748 | 585f8587 | bellard | header.l1_table_offset = cpu_to_be64(s->l1_table_offset); |
749 | 585f8587 | bellard | header.l1_size = cpu_to_be32(l1_size); |
750 | 15e6690a | bellard | offset += align_offset(l1_size * sizeof(uint64_t), s->cluster_size);
|
751 | 585f8587 | bellard | |
752 | 585f8587 | bellard | s->refcount_table = qemu_mallocz(s->cluster_size); |
753 | 3b46e624 | ths | |
754 | 585f8587 | bellard | s->refcount_table_offset = offset; |
755 | 585f8587 | bellard | header.refcount_table_offset = cpu_to_be64(offset); |
756 | 585f8587 | bellard | header.refcount_table_clusters = cpu_to_be32(1);
|
757 | 585f8587 | bellard | offset += s->cluster_size; |
758 | 585f8587 | bellard | s->refcount_block_offset = offset; |
759 | 2d2431f0 | aliguori | |
760 | 2d2431f0 | aliguori | /* count how many refcount blocks needed */
|
761 | 2d2431f0 | aliguori | tmp = offset >> s->cluster_bits; |
762 | 2d2431f0 | aliguori | ref_clusters = (tmp >> (s->cluster_bits - REFCOUNT_SHIFT)) + 1;
|
763 | 2d2431f0 | aliguori | for (i=0; i < ref_clusters; i++) { |
764 | 2d2431f0 | aliguori | s->refcount_table[i] = cpu_to_be64(offset); |
765 | 2d2431f0 | aliguori | offset += s->cluster_size; |
766 | 2d2431f0 | aliguori | } |
767 | 2d2431f0 | aliguori | |
768 | 2d2431f0 | aliguori | s->refcount_block = qemu_mallocz(ref_clusters * s->cluster_size); |
769 | 585f8587 | bellard | |
770 | 585f8587 | bellard | /* update refcounts */
|
771 | ed6ccf0f | Kevin Wolf | qcow2_create_refcount_update(s, 0, header_size);
|
772 | ed6ccf0f | Kevin Wolf | qcow2_create_refcount_update(s, s->l1_table_offset, |
773 | ed6ccf0f | Kevin Wolf | l1_size * sizeof(uint64_t));
|
774 | ed6ccf0f | Kevin Wolf | qcow2_create_refcount_update(s, s->refcount_table_offset, s->cluster_size); |
775 | ed6ccf0f | Kevin Wolf | qcow2_create_refcount_update(s, s->refcount_block_offset, |
776 | ed6ccf0f | Kevin Wolf | ref_clusters * s->cluster_size); |
777 | 3b46e624 | ths | |
778 | 585f8587 | bellard | /* write all the data */
|
779 | 585f8587 | bellard | write(fd, &header, sizeof(header));
|
780 | 585f8587 | bellard | if (backing_file) {
|
781 | f965509c | aliguori | if (backing_format_len) {
|
782 | f965509c | aliguori | char zero[16]; |
783 | f965509c | aliguori | int d = ext_bf.len - backing_format_len;
|
784 | f965509c | aliguori | |
785 | f965509c | aliguori | memset(zero, 0, sizeof(zero)); |
786 | f965509c | aliguori | cpu_to_be32s(&ext_bf.magic); |
787 | f965509c | aliguori | cpu_to_be32s(&ext_bf.len); |
788 | f965509c | aliguori | write(fd, &ext_bf, sizeof(ext_bf));
|
789 | f965509c | aliguori | write(fd, backing_format, backing_format_len); |
790 | f965509c | aliguori | if (d>0) { |
791 | f965509c | aliguori | write(fd, zero, d); |
792 | f965509c | aliguori | } |
793 | f965509c | aliguori | } |
794 | 585f8587 | bellard | write(fd, backing_file, backing_filename_len); |
795 | 585f8587 | bellard | } |
796 | 585f8587 | bellard | lseek(fd, s->l1_table_offset, SEEK_SET); |
797 | 585f8587 | bellard | tmp = 0;
|
798 | 585f8587 | bellard | for(i = 0;i < l1_size; i++) { |
799 | 585f8587 | bellard | write(fd, &tmp, sizeof(tmp));
|
800 | 585f8587 | bellard | } |
801 | 585f8587 | bellard | lseek(fd, s->refcount_table_offset, SEEK_SET); |
802 | 585f8587 | bellard | write(fd, s->refcount_table, s->cluster_size); |
803 | 3b46e624 | ths | |
804 | 585f8587 | bellard | lseek(fd, s->refcount_block_offset, SEEK_SET); |
805 | 2d2431f0 | aliguori | write(fd, s->refcount_block, ref_clusters * s->cluster_size); |
806 | 585f8587 | bellard | |
807 | 585f8587 | bellard | qemu_free(s->refcount_table); |
808 | 585f8587 | bellard | qemu_free(s->refcount_block); |
809 | 585f8587 | bellard | close(fd); |
810 | a35e1c17 | Kevin Wolf | |
811 | a35e1c17 | Kevin Wolf | /* Preallocate metadata */
|
812 | a35e1c17 | Kevin Wolf | if (prealloc) {
|
813 | a35e1c17 | Kevin Wolf | BlockDriverState *bs; |
814 | a35e1c17 | Kevin Wolf | bs = bdrv_new("");
|
815 | a35e1c17 | Kevin Wolf | bdrv_open(bs, filename, BDRV_O_CACHE_WB); |
816 | a35e1c17 | Kevin Wolf | preallocate(bs); |
817 | a35e1c17 | Kevin Wolf | bdrv_close(bs); |
818 | a35e1c17 | Kevin Wolf | } |
819 | a35e1c17 | Kevin Wolf | |
820 | 585f8587 | bellard | return 0; |
821 | 585f8587 | bellard | } |
822 | 585f8587 | bellard | |
823 | 0e7e1989 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
824 | 0e7e1989 | Kevin Wolf | { |
825 | 0e7e1989 | Kevin Wolf | const char *backing_file = NULL; |
826 | 0e7e1989 | Kevin Wolf | const char *backing_fmt = NULL; |
827 | 0e7e1989 | Kevin Wolf | uint64_t sectors = 0;
|
828 | 0e7e1989 | Kevin Wolf | int flags = 0; |
829 | 9ccb258e | Kevin Wolf | size_t cluster_size = 65536;
|
830 | a35e1c17 | Kevin Wolf | int prealloc = 0; |
831 | 0e7e1989 | Kevin Wolf | |
832 | 0e7e1989 | Kevin Wolf | /* Read out options */
|
833 | 0e7e1989 | Kevin Wolf | while (options && options->name) {
|
834 | 0e7e1989 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
835 | 0e7e1989 | Kevin Wolf | sectors = options->value.n / 512;
|
836 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
837 | 0e7e1989 | Kevin Wolf | backing_file = options->value.s; |
838 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { |
839 | 0e7e1989 | Kevin Wolf | backing_fmt = options->value.s; |
840 | 0e7e1989 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
841 | 0e7e1989 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
842 | 73c632ed | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
843 | 73c632ed | Kevin Wolf | if (options->value.n) {
|
844 | 73c632ed | Kevin Wolf | cluster_size = options->value.n; |
845 | 73c632ed | Kevin Wolf | } |
846 | a35e1c17 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
847 | a35e1c17 | Kevin Wolf | if (!options->value.s || !strcmp(options->value.s, "off")) { |
848 | a35e1c17 | Kevin Wolf | prealloc = 0;
|
849 | a35e1c17 | Kevin Wolf | } else if (!strcmp(options->value.s, "metadata")) { |
850 | a35e1c17 | Kevin Wolf | prealloc = 1;
|
851 | a35e1c17 | Kevin Wolf | } else {
|
852 | a35e1c17 | Kevin Wolf | fprintf(stderr, "Invalid preallocation mode: '%s'\n",
|
853 | a35e1c17 | Kevin Wolf | options->value.s); |
854 | a35e1c17 | Kevin Wolf | return -EINVAL;
|
855 | a35e1c17 | Kevin Wolf | } |
856 | 0e7e1989 | Kevin Wolf | } |
857 | 0e7e1989 | Kevin Wolf | options++; |
858 | 0e7e1989 | Kevin Wolf | } |
859 | 0e7e1989 | Kevin Wolf | |
860 | a35e1c17 | Kevin Wolf | if (backing_file && prealloc) {
|
861 | a35e1c17 | Kevin Wolf | fprintf(stderr, "Backing file and preallocation cannot be used at "
|
862 | a35e1c17 | Kevin Wolf | "the same time\n");
|
863 | a35e1c17 | Kevin Wolf | return -EINVAL;
|
864 | a35e1c17 | Kevin Wolf | } |
865 | a35e1c17 | Kevin Wolf | |
866 | 73c632ed | Kevin Wolf | return qcow_create2(filename, sectors, backing_file, backing_fmt, flags,
|
867 | a35e1c17 | Kevin Wolf | cluster_size, prealloc); |
868 | f965509c | aliguori | } |
869 | f965509c | aliguori | |
870 | 585f8587 | bellard | static int qcow_make_empty(BlockDriverState *bs) |
871 | 585f8587 | bellard | { |
872 | 585f8587 | bellard | #if 0
|
873 | 585f8587 | bellard | /* XXX: not correct */
|
874 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque;
|
875 | 585f8587 | bellard | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
876 | 585f8587 | bellard | int ret;
|
877 | 585f8587 | bellard | |
878 | 585f8587 | bellard | memset(s->l1_table, 0, l1_length);
|
879 | 585f8587 | bellard | if (bdrv_pwrite(s->hd, s->l1_table_offset, s->l1_table, l1_length) < 0)
|
880 | ac674887 | aliguori | return -1;
|
881 | 585f8587 | bellard | ret = bdrv_truncate(s->hd, s->l1_table_offset + l1_length);
|
882 | 585f8587 | bellard | if (ret < 0)
|
883 | 585f8587 | bellard | return ret;
|
884 | 3b46e624 | ths | |
885 | 585f8587 | bellard | l2_cache_reset(bs);
|
886 | 585f8587 | bellard | #endif
|
887 | 585f8587 | bellard | return 0; |
888 | 585f8587 | bellard | } |
889 | 585f8587 | bellard | |
890 | 585f8587 | bellard | /* XXX: put compressed sectors first, then all the cluster aligned
|
891 | 585f8587 | bellard | tables to avoid losing bytes in alignment */
|
892 | 5fafdf24 | ths | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
893 | 585f8587 | bellard | const uint8_t *buf, int nb_sectors) |
894 | 585f8587 | bellard | { |
895 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
896 | 585f8587 | bellard | z_stream strm; |
897 | 585f8587 | bellard | int ret, out_len;
|
898 | 585f8587 | bellard | uint8_t *out_buf; |
899 | 585f8587 | bellard | uint64_t cluster_offset; |
900 | 585f8587 | bellard | |
901 | 585f8587 | bellard | if (nb_sectors == 0) { |
902 | 585f8587 | bellard | /* align end of file to a sector boundary to ease reading with
|
903 | 585f8587 | bellard | sector based I/Os */
|
904 | 585f8587 | bellard | cluster_offset = bdrv_getlength(s->hd); |
905 | 585f8587 | bellard | cluster_offset = (cluster_offset + 511) & ~511; |
906 | 585f8587 | bellard | bdrv_truncate(s->hd, cluster_offset); |
907 | 585f8587 | bellard | return 0; |
908 | 585f8587 | bellard | } |
909 | 585f8587 | bellard | |
910 | 585f8587 | bellard | if (nb_sectors != s->cluster_sectors)
|
911 | 585f8587 | bellard | return -EINVAL;
|
912 | 585f8587 | bellard | |
913 | 585f8587 | bellard | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
914 | 585f8587 | bellard | |
915 | 585f8587 | bellard | /* best compression, small window, no zlib header */
|
916 | 585f8587 | bellard | memset(&strm, 0, sizeof(strm)); |
917 | 585f8587 | bellard | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
918 | 5fafdf24 | ths | Z_DEFLATED, -12,
|
919 | 585f8587 | bellard | 9, Z_DEFAULT_STRATEGY);
|
920 | 585f8587 | bellard | if (ret != 0) { |
921 | 585f8587 | bellard | qemu_free(out_buf); |
922 | 585f8587 | bellard | return -1; |
923 | 585f8587 | bellard | } |
924 | 585f8587 | bellard | |
925 | 585f8587 | bellard | strm.avail_in = s->cluster_size; |
926 | 585f8587 | bellard | strm.next_in = (uint8_t *)buf; |
927 | 585f8587 | bellard | strm.avail_out = s->cluster_size; |
928 | 585f8587 | bellard | strm.next_out = out_buf; |
929 | 585f8587 | bellard | |
930 | 585f8587 | bellard | ret = deflate(&strm, Z_FINISH); |
931 | 585f8587 | bellard | if (ret != Z_STREAM_END && ret != Z_OK) {
|
932 | 585f8587 | bellard | qemu_free(out_buf); |
933 | 585f8587 | bellard | deflateEnd(&strm); |
934 | 585f8587 | bellard | return -1; |
935 | 585f8587 | bellard | } |
936 | 585f8587 | bellard | out_len = strm.next_out - out_buf; |
937 | 585f8587 | bellard | |
938 | 585f8587 | bellard | deflateEnd(&strm); |
939 | 585f8587 | bellard | |
940 | 585f8587 | bellard | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
941 | 585f8587 | bellard | /* could not compress: write normal cluster */
|
942 | ade40677 | Kevin Wolf | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
943 | 585f8587 | bellard | } else {
|
944 | ed6ccf0f | Kevin Wolf | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, |
945 | ed6ccf0f | Kevin Wolf | sector_num << 9, out_len);
|
946 | 52d893ec | aliguori | if (!cluster_offset)
|
947 | 52d893ec | aliguori | return -1; |
948 | 585f8587 | bellard | cluster_offset &= s->cluster_offset_mask; |
949 | 585f8587 | bellard | if (bdrv_pwrite(s->hd, cluster_offset, out_buf, out_len) != out_len) {
|
950 | 585f8587 | bellard | qemu_free(out_buf); |
951 | 585f8587 | bellard | return -1; |
952 | 585f8587 | bellard | } |
953 | 585f8587 | bellard | } |
954 | 3b46e624 | ths | |
955 | 585f8587 | bellard | qemu_free(out_buf); |
956 | 585f8587 | bellard | return 0; |
957 | 585f8587 | bellard | } |
958 | 585f8587 | bellard | |
959 | 585f8587 | bellard | static void qcow_flush(BlockDriverState *bs) |
960 | 585f8587 | bellard | { |
961 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
962 | 585f8587 | bellard | bdrv_flush(s->hd); |
963 | 585f8587 | bellard | } |
964 | 585f8587 | bellard | |
965 | 45566e9c | Christoph Hellwig | static int64_t qcow_vm_state_offset(BDRVQcowState *s)
|
966 | 45566e9c | Christoph Hellwig | { |
967 | 45566e9c | Christoph Hellwig | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
|
968 | 45566e9c | Christoph Hellwig | } |
969 | 45566e9c | Christoph Hellwig | |
970 | 585f8587 | bellard | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
971 | 585f8587 | bellard | { |
972 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
973 | 585f8587 | bellard | bdi->cluster_size = s->cluster_size; |
974 | 45566e9c | Christoph Hellwig | bdi->vm_state_offset = qcow_vm_state_offset(s); |
975 | 585f8587 | bellard | return 0; |
976 | 585f8587 | bellard | } |
977 | 585f8587 | bellard | |
978 | 585f8587 | bellard | |
979 | e97fc193 | aliguori | static int qcow_check(BlockDriverState *bs) |
980 | e97fc193 | aliguori | { |
981 | ed6ccf0f | Kevin Wolf | return qcow2_check_refcounts(bs);
|
982 | 585f8587 | bellard | } |
983 | 585f8587 | bellard | |
984 | 585f8587 | bellard | #if 0
|
985 | 585f8587 | bellard | static void dump_refcounts(BlockDriverState *bs)
|
986 | 585f8587 | bellard | {
|
987 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque;
|
988 | 585f8587 | bellard | int64_t nb_clusters, k, k1, size;
|
989 | 585f8587 | bellard | int refcount;
|
990 | 585f8587 | bellard | |
991 | 585f8587 | bellard | size = bdrv_getlength(s->hd);
|
992 | 6db6c638 | aliguori | nb_clusters = size_to_clusters(s, size);
|
993 | 585f8587 | bellard | for(k = 0; k < nb_clusters;) {
|
994 | 585f8587 | bellard | k1 = k;
|
995 | 585f8587 | bellard | refcount = get_refcount(bs, k);
|
996 | 585f8587 | bellard | k++;
|
997 | 585f8587 | bellard | while (k < nb_clusters && get_refcount(bs, k) == refcount)
|
998 | 585f8587 | bellard | k++;
|
999 | 585f8587 | bellard | printf("%lld: refcount=%d nb=%lld\n", k, refcount, k - k1);
|
1000 | 585f8587 | bellard | }
|
1001 | 585f8587 | bellard | }
|
1002 | 585f8587 | bellard | #endif
|
1003 | 585f8587 | bellard | |
1004 | 45566e9c | Christoph Hellwig | static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1005 | 178e08a5 | aliguori | int64_t pos, int size)
|
1006 | 178e08a5 | aliguori | { |
1007 | 45566e9c | Christoph Hellwig | BDRVQcowState *s = bs->opaque; |
1008 | 178e08a5 | aliguori | int growable = bs->growable;
|
1009 | 178e08a5 | aliguori | |
1010 | 178e08a5 | aliguori | bs->growable = 1;
|
1011 | 45566e9c | Christoph Hellwig | bdrv_pwrite(bs, qcow_vm_state_offset(s) + pos, buf, size); |
1012 | 178e08a5 | aliguori | bs->growable = growable; |
1013 | 178e08a5 | aliguori | |
1014 | 178e08a5 | aliguori | return size;
|
1015 | 178e08a5 | aliguori | } |
1016 | 178e08a5 | aliguori | |
1017 | 45566e9c | Christoph Hellwig | static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1018 | 178e08a5 | aliguori | int64_t pos, int size)
|
1019 | 178e08a5 | aliguori | { |
1020 | 45566e9c | Christoph Hellwig | BDRVQcowState *s = bs->opaque; |
1021 | 178e08a5 | aliguori | int growable = bs->growable;
|
1022 | 178e08a5 | aliguori | int ret;
|
1023 | 178e08a5 | aliguori | |
1024 | 178e08a5 | aliguori | bs->growable = 1;
|
1025 | 45566e9c | Christoph Hellwig | ret = bdrv_pread(bs, qcow_vm_state_offset(s) + pos, buf, size); |
1026 | 178e08a5 | aliguori | bs->growable = growable; |
1027 | 178e08a5 | aliguori | |
1028 | 178e08a5 | aliguori | return ret;
|
1029 | 178e08a5 | aliguori | } |
1030 | 178e08a5 | aliguori | |
1031 | 0e7e1989 | Kevin Wolf | static QEMUOptionParameter qcow_create_options[] = {
|
1032 | db08adf5 | Kevin Wolf | { |
1033 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_SIZE, |
1034 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
1035 | db08adf5 | Kevin Wolf | .help = "Virtual disk size"
|
1036 | db08adf5 | Kevin Wolf | }, |
1037 | db08adf5 | Kevin Wolf | { |
1038 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FILE, |
1039 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
1040 | db08adf5 | Kevin Wolf | .help = "File name of a base image"
|
1041 | db08adf5 | Kevin Wolf | }, |
1042 | db08adf5 | Kevin Wolf | { |
1043 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_BACKING_FMT, |
1044 | db08adf5 | Kevin Wolf | .type = OPT_STRING, |
1045 | db08adf5 | Kevin Wolf | .help = "Image format of the base image"
|
1046 | db08adf5 | Kevin Wolf | }, |
1047 | db08adf5 | Kevin Wolf | { |
1048 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_ENCRYPT, |
1049 | db08adf5 | Kevin Wolf | .type = OPT_FLAG, |
1050 | db08adf5 | Kevin Wolf | .help = "Encrypt the image"
|
1051 | db08adf5 | Kevin Wolf | }, |
1052 | db08adf5 | Kevin Wolf | { |
1053 | db08adf5 | Kevin Wolf | .name = BLOCK_OPT_CLUSTER_SIZE, |
1054 | db08adf5 | Kevin Wolf | .type = OPT_SIZE, |
1055 | db08adf5 | Kevin Wolf | .help = "qcow2 cluster size"
|
1056 | db08adf5 | Kevin Wolf | }, |
1057 | a35e1c17 | Kevin Wolf | { |
1058 | a35e1c17 | Kevin Wolf | .name = BLOCK_OPT_PREALLOC, |
1059 | a35e1c17 | Kevin Wolf | .type = OPT_STRING, |
1060 | a35e1c17 | Kevin Wolf | .help = "Preallocation mode (allowed values: off, metadata)"
|
1061 | a35e1c17 | Kevin Wolf | }, |
1062 | 0e7e1989 | Kevin Wolf | { NULL }
|
1063 | 0e7e1989 | Kevin Wolf | }; |
1064 | 0e7e1989 | Kevin Wolf | |
1065 | 5efa9d5a | Anthony Liguori | static BlockDriver bdrv_qcow2 = {
|
1066 | e60f469c | aurel32 | .format_name = "qcow2",
|
1067 | e60f469c | aurel32 | .instance_size = sizeof(BDRVQcowState),
|
1068 | e60f469c | aurel32 | .bdrv_probe = qcow_probe, |
1069 | e60f469c | aurel32 | .bdrv_open = qcow_open, |
1070 | e60f469c | aurel32 | .bdrv_close = qcow_close, |
1071 | e60f469c | aurel32 | .bdrv_create = qcow_create, |
1072 | e60f469c | aurel32 | .bdrv_flush = qcow_flush, |
1073 | e60f469c | aurel32 | .bdrv_is_allocated = qcow_is_allocated, |
1074 | e60f469c | aurel32 | .bdrv_set_key = qcow_set_key, |
1075 | e60f469c | aurel32 | .bdrv_make_empty = qcow_make_empty, |
1076 | e60f469c | aurel32 | |
1077 | f141eafe | aliguori | .bdrv_aio_readv = qcow_aio_readv, |
1078 | f141eafe | aliguori | .bdrv_aio_writev = qcow_aio_writev, |
1079 | 585f8587 | bellard | .bdrv_write_compressed = qcow_write_compressed, |
1080 | 585f8587 | bellard | |
1081 | ed6ccf0f | Kevin Wolf | .bdrv_snapshot_create = qcow2_snapshot_create, |
1082 | ed6ccf0f | Kevin Wolf | .bdrv_snapshot_goto = qcow2_snapshot_goto, |
1083 | ed6ccf0f | Kevin Wolf | .bdrv_snapshot_delete = qcow2_snapshot_delete, |
1084 | ed6ccf0f | Kevin Wolf | .bdrv_snapshot_list = qcow2_snapshot_list, |
1085 | e60f469c | aurel32 | .bdrv_get_info = qcow_get_info, |
1086 | f965509c | aliguori | |
1087 | 45566e9c | Christoph Hellwig | .bdrv_save_vmstate = qcow_save_vmstate, |
1088 | 45566e9c | Christoph Hellwig | .bdrv_load_vmstate = qcow_load_vmstate, |
1089 | 178e08a5 | aliguori | |
1090 | 0e7e1989 | Kevin Wolf | .create_options = qcow_create_options, |
1091 | e97fc193 | aliguori | .bdrv_check = qcow_check, |
1092 | 585f8587 | bellard | }; |
1093 | 5efa9d5a | Anthony Liguori | |
1094 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow2_init(void) |
1095 | 5efa9d5a | Anthony Liguori | { |
1096 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow2); |
1097 | 5efa9d5a | Anthony Liguori | } |
1098 | 5efa9d5a | Anthony Liguori | |
1099 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow2_init); |