root / block / qcow2.c @ 528f7663
History | View | Annotate | Download (40.4 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 | 585f8587 | bellard | static int qcow_probe(const uint8_t *buf, int buf_size, const char *filename) |
56 | 585f8587 | bellard | { |
57 | 585f8587 | bellard | const QCowHeader *cow_header = (const void *)buf; |
58 | 3b46e624 | ths | |
59 | 585f8587 | bellard | if (buf_size >= sizeof(QCowHeader) && |
60 | 585f8587 | bellard | be32_to_cpu(cow_header->magic) == QCOW_MAGIC && |
61 | 5fafdf24 | ths | be32_to_cpu(cow_header->version) == QCOW_VERSION) |
62 | 585f8587 | bellard | return 100; |
63 | 585f8587 | bellard | else
|
64 | 585f8587 | bellard | return 0; |
65 | 585f8587 | bellard | } |
66 | 585f8587 | bellard | |
67 | 9b80ddf3 | aliguori | |
68 | 9b80ddf3 | aliguori | /*
|
69 | 9b80ddf3 | aliguori | * read qcow2 extension and fill bs
|
70 | 9b80ddf3 | aliguori | * start reading from start_offset
|
71 | 9b80ddf3 | aliguori | * finish reading upon magic of value 0 or when end_offset reached
|
72 | 9b80ddf3 | aliguori | * unknown magic is skipped (future extension this version knows nothing about)
|
73 | 9b80ddf3 | aliguori | * return 0 upon success, non-0 otherwise
|
74 | 9b80ddf3 | aliguori | */
|
75 | 9b80ddf3 | aliguori | static int qcow_read_extensions(BlockDriverState *bs, uint64_t start_offset, |
76 | 9b80ddf3 | aliguori | uint64_t end_offset) |
77 | 9b80ddf3 | aliguori | { |
78 | 9b80ddf3 | aliguori | QCowExtension ext; |
79 | 9b80ddf3 | aliguori | uint64_t offset; |
80 | 9b80ddf3 | aliguori | |
81 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
82 | 9b80ddf3 | aliguori | printf("qcow_read_extensions: start=%ld end=%ld\n", start_offset, end_offset);
|
83 | 9b80ddf3 | aliguori | #endif
|
84 | 9b80ddf3 | aliguori | offset = start_offset; |
85 | 9b80ddf3 | aliguori | while (offset < end_offset) {
|
86 | 9b80ddf3 | aliguori | |
87 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
88 | 9b80ddf3 | aliguori | /* Sanity check */
|
89 | 9b80ddf3 | aliguori | if (offset > s->cluster_size)
|
90 | 9b80ddf3 | aliguori | printf("qcow_handle_extension: suspicious offset %lu\n", offset);
|
91 | 9b80ddf3 | aliguori | |
92 | 9b80ddf3 | aliguori | printf("attemting to read extended header in offset %lu\n", offset);
|
93 | 9b80ddf3 | aliguori | #endif
|
94 | 9b80ddf3 | aliguori | |
95 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset, &ext, sizeof(ext)) != sizeof(ext)) { |
96 | 0bfcd599 | Blue Swirl | fprintf(stderr, "qcow_handle_extension: ERROR: "
|
97 | 0bfcd599 | Blue Swirl | "pread fail from offset %" PRIu64 "\n", |
98 | 0bfcd599 | Blue Swirl | offset); |
99 | 9b80ddf3 | aliguori | return 1; |
100 | 9b80ddf3 | aliguori | } |
101 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.magic); |
102 | 9b80ddf3 | aliguori | be32_to_cpus(&ext.len); |
103 | 9b80ddf3 | aliguori | offset += sizeof(ext);
|
104 | 9b80ddf3 | aliguori | #ifdef DEBUG_EXT
|
105 | 9b80ddf3 | aliguori | printf("ext.magic = 0x%x\n", ext.magic);
|
106 | 9b80ddf3 | aliguori | #endif
|
107 | 9b80ddf3 | aliguori | switch (ext.magic) {
|
108 | 9b80ddf3 | aliguori | case QCOW_EXT_MAGIC_END:
|
109 | 9b80ddf3 | aliguori | return 0; |
110 | f965509c | aliguori | |
111 | f965509c | aliguori | case QCOW_EXT_MAGIC_BACKING_FORMAT:
|
112 | f965509c | aliguori | if (ext.len >= sizeof(bs->backing_format)) { |
113 | f965509c | aliguori | fprintf(stderr, "ERROR: ext_backing_format: len=%u too large"
|
114 | 4c978075 | aliguori | " (>=%zu)\n",
|
115 | f965509c | aliguori | ext.len, sizeof(bs->backing_format));
|
116 | f965509c | aliguori | return 2; |
117 | f965509c | aliguori | } |
118 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, offset , bs->backing_format,
|
119 | f965509c | aliguori | ext.len) != ext.len) |
120 | f965509c | aliguori | return 3; |
121 | f965509c | aliguori | bs->backing_format[ext.len] = '\0';
|
122 | f965509c | aliguori | #ifdef DEBUG_EXT
|
123 | f965509c | aliguori | printf("Qcow2: Got format extension %s\n", bs->backing_format);
|
124 | f965509c | aliguori | #endif
|
125 | e1c7f0e3 | Kevin Wolf | offset = ((offset + ext.len + 7) & ~7); |
126 | f965509c | aliguori | break;
|
127 | f965509c | aliguori | |
128 | 9b80ddf3 | aliguori | default:
|
129 | 9b80ddf3 | aliguori | /* unknown magic -- just skip it */
|
130 | e1c7f0e3 | Kevin Wolf | offset = ((offset + ext.len + 7) & ~7); |
131 | 9b80ddf3 | aliguori | break;
|
132 | 9b80ddf3 | aliguori | } |
133 | 9b80ddf3 | aliguori | } |
134 | 9b80ddf3 | aliguori | |
135 | 9b80ddf3 | aliguori | return 0; |
136 | 9b80ddf3 | aliguori | } |
137 | 9b80ddf3 | aliguori | |
138 | 9b80ddf3 | aliguori | |
139 | 66f82cee | Kevin Wolf | static int qcow_open(BlockDriverState *bs, int flags) |
140 | 585f8587 | bellard | { |
141 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
142 | 419b19d9 | Stefan Hajnoczi | int len, i;
|
143 | 585f8587 | bellard | QCowHeader header; |
144 | 9b80ddf3 | aliguori | uint64_t ext_end; |
145 | 585f8587 | bellard | |
146 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, 0, &header, sizeof(header)) != sizeof(header)) |
147 | 585f8587 | bellard | goto fail;
|
148 | 585f8587 | bellard | be32_to_cpus(&header.magic); |
149 | 585f8587 | bellard | be32_to_cpus(&header.version); |
150 | 585f8587 | bellard | be64_to_cpus(&header.backing_file_offset); |
151 | 585f8587 | bellard | be32_to_cpus(&header.backing_file_size); |
152 | 585f8587 | bellard | be64_to_cpus(&header.size); |
153 | 585f8587 | bellard | be32_to_cpus(&header.cluster_bits); |
154 | 585f8587 | bellard | be32_to_cpus(&header.crypt_method); |
155 | 585f8587 | bellard | be64_to_cpus(&header.l1_table_offset); |
156 | 585f8587 | bellard | be32_to_cpus(&header.l1_size); |
157 | 585f8587 | bellard | be64_to_cpus(&header.refcount_table_offset); |
158 | 585f8587 | bellard | be32_to_cpus(&header.refcount_table_clusters); |
159 | 585f8587 | bellard | be64_to_cpus(&header.snapshots_offset); |
160 | 585f8587 | bellard | be32_to_cpus(&header.nb_snapshots); |
161 | 3b46e624 | ths | |
162 | 585f8587 | bellard | if (header.magic != QCOW_MAGIC || header.version != QCOW_VERSION)
|
163 | 585f8587 | bellard | goto fail;
|
164 | d191d12d | Stefan Weil | if (header.cluster_bits < MIN_CLUSTER_BITS ||
|
165 | 73c632ed | Kevin Wolf | header.cluster_bits > MAX_CLUSTER_BITS) |
166 | 585f8587 | bellard | goto fail;
|
167 | 585f8587 | bellard | if (header.crypt_method > QCOW_CRYPT_AES)
|
168 | 585f8587 | bellard | goto fail;
|
169 | 585f8587 | bellard | s->crypt_method_header = header.crypt_method; |
170 | 585f8587 | bellard | if (s->crypt_method_header)
|
171 | 585f8587 | bellard | bs->encrypted = 1;
|
172 | 585f8587 | bellard | s->cluster_bits = header.cluster_bits; |
173 | 585f8587 | bellard | s->cluster_size = 1 << s->cluster_bits;
|
174 | 585f8587 | bellard | s->cluster_sectors = 1 << (s->cluster_bits - 9); |
175 | 585f8587 | bellard | s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */ |
176 | 585f8587 | bellard | s->l2_size = 1 << s->l2_bits;
|
177 | 585f8587 | bellard | bs->total_sectors = header.size / 512;
|
178 | 585f8587 | bellard | s->csize_shift = (62 - (s->cluster_bits - 8)); |
179 | 585f8587 | bellard | s->csize_mask = (1 << (s->cluster_bits - 8)) - 1; |
180 | 585f8587 | bellard | s->cluster_offset_mask = (1LL << s->csize_shift) - 1; |
181 | 585f8587 | bellard | s->refcount_table_offset = header.refcount_table_offset; |
182 | 5fafdf24 | ths | s->refcount_table_size = |
183 | 585f8587 | bellard | header.refcount_table_clusters << (s->cluster_bits - 3);
|
184 | 585f8587 | bellard | |
185 | 585f8587 | bellard | s->snapshots_offset = header.snapshots_offset; |
186 | 585f8587 | bellard | s->nb_snapshots = header.nb_snapshots; |
187 | 585f8587 | bellard | |
188 | 585f8587 | bellard | /* read the level 1 table */
|
189 | 585f8587 | bellard | s->l1_size = header.l1_size; |
190 | 419b19d9 | Stefan Hajnoczi | s->l1_vm_state_index = size_to_l1(s, header.size); |
191 | 585f8587 | bellard | /* the L1 table must contain at least enough entries to put
|
192 | 585f8587 | bellard | header.size bytes */
|
193 | 585f8587 | bellard | if (s->l1_size < s->l1_vm_state_index)
|
194 | 585f8587 | bellard | goto fail;
|
195 | 585f8587 | bellard | s->l1_table_offset = header.l1_table_offset; |
196 | d191d12d | Stefan Weil | if (s->l1_size > 0) { |
197 | d191d12d | Stefan Weil | s->l1_table = qemu_mallocz( |
198 | d191d12d | Stefan Weil | align_offset(s->l1_size * sizeof(uint64_t), 512)); |
199 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, s->l1_table_offset, s->l1_table, s->l1_size * sizeof(uint64_t)) != |
200 | d191d12d | Stefan Weil | s->l1_size * sizeof(uint64_t))
|
201 | d191d12d | Stefan Weil | goto fail;
|
202 | d191d12d | Stefan Weil | for(i = 0;i < s->l1_size; i++) { |
203 | d191d12d | Stefan Weil | be64_to_cpus(&s->l1_table[i]); |
204 | d191d12d | Stefan Weil | } |
205 | 585f8587 | bellard | } |
206 | 585f8587 | bellard | /* alloc L2 cache */
|
207 | 585f8587 | bellard | s->l2_cache = qemu_malloc(s->l2_size * L2_CACHE_SIZE * sizeof(uint64_t));
|
208 | 585f8587 | bellard | s->cluster_cache = qemu_malloc(s->cluster_size); |
209 | 585f8587 | bellard | /* one more sector for decompressed data alignment */
|
210 | 095a9c58 | aliguori | s->cluster_data = qemu_malloc(QCOW_MAX_CRYPT_CLUSTERS * s->cluster_size |
211 | 095a9c58 | aliguori | + 512);
|
212 | 585f8587 | bellard | s->cluster_cache_offset = -1;
|
213 | 3b46e624 | ths | |
214 | ed6ccf0f | Kevin Wolf | if (qcow2_refcount_init(bs) < 0) |
215 | 585f8587 | bellard | goto fail;
|
216 | 585f8587 | bellard | |
217 | 72cf2d4f | Blue Swirl | QLIST_INIT(&s->cluster_allocs); |
218 | f214978a | Kevin Wolf | |
219 | 9b80ddf3 | aliguori | /* read qcow2 extensions */
|
220 | 9b80ddf3 | aliguori | if (header.backing_file_offset)
|
221 | 9b80ddf3 | aliguori | ext_end = header.backing_file_offset; |
222 | 9b80ddf3 | aliguori | else
|
223 | 9b80ddf3 | aliguori | ext_end = s->cluster_size; |
224 | 9b80ddf3 | aliguori | if (qcow_read_extensions(bs, sizeof(header), ext_end)) |
225 | 9b80ddf3 | aliguori | goto fail;
|
226 | 9b80ddf3 | aliguori | |
227 | 585f8587 | bellard | /* read the backing file name */
|
228 | 585f8587 | bellard | if (header.backing_file_offset != 0) { |
229 | 585f8587 | bellard | len = header.backing_file_size; |
230 | 585f8587 | bellard | if (len > 1023) |
231 | 585f8587 | bellard | len = 1023;
|
232 | 66f82cee | Kevin Wolf | if (bdrv_pread(bs->file, header.backing_file_offset, bs->backing_file, len) != len)
|
233 | 585f8587 | bellard | goto fail;
|
234 | 585f8587 | bellard | bs->backing_file[len] = '\0';
|
235 | 585f8587 | bellard | } |
236 | ed6ccf0f | Kevin Wolf | if (qcow2_read_snapshots(bs) < 0) |
237 | 585f8587 | bellard | goto fail;
|
238 | 585f8587 | bellard | |
239 | 585f8587 | bellard | #ifdef DEBUG_ALLOC
|
240 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
241 | 585f8587 | bellard | #endif
|
242 | 585f8587 | bellard | return 0; |
243 | 585f8587 | bellard | |
244 | 585f8587 | bellard | fail:
|
245 | ed6ccf0f | Kevin Wolf | qcow2_free_snapshots(bs); |
246 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
247 | 585f8587 | bellard | qemu_free(s->l1_table); |
248 | 585f8587 | bellard | qemu_free(s->l2_cache); |
249 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
250 | 585f8587 | bellard | qemu_free(s->cluster_data); |
251 | 585f8587 | bellard | return -1; |
252 | 585f8587 | bellard | } |
253 | 585f8587 | bellard | |
254 | 585f8587 | bellard | static int qcow_set_key(BlockDriverState *bs, const char *key) |
255 | 585f8587 | bellard | { |
256 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
257 | 585f8587 | bellard | uint8_t keybuf[16];
|
258 | 585f8587 | bellard | int len, i;
|
259 | 3b46e624 | ths | |
260 | 585f8587 | bellard | memset(keybuf, 0, 16); |
261 | 585f8587 | bellard | len = strlen(key); |
262 | 585f8587 | bellard | if (len > 16) |
263 | 585f8587 | bellard | len = 16;
|
264 | 585f8587 | bellard | /* XXX: we could compress the chars to 7 bits to increase
|
265 | 585f8587 | bellard | entropy */
|
266 | 585f8587 | bellard | for(i = 0;i < len;i++) { |
267 | 585f8587 | bellard | keybuf[i] = key[i]; |
268 | 585f8587 | bellard | } |
269 | 585f8587 | bellard | s->crypt_method = s->crypt_method_header; |
270 | 585f8587 | bellard | |
271 | 585f8587 | bellard | if (AES_set_encrypt_key(keybuf, 128, &s->aes_encrypt_key) != 0) |
272 | 585f8587 | bellard | return -1; |
273 | 585f8587 | bellard | if (AES_set_decrypt_key(keybuf, 128, &s->aes_decrypt_key) != 0) |
274 | 585f8587 | bellard | return -1; |
275 | 585f8587 | bellard | #if 0
|
276 | 585f8587 | bellard | /* test */
|
277 | 585f8587 | bellard | {
|
278 | 585f8587 | bellard | uint8_t in[16];
|
279 | 585f8587 | bellard | uint8_t out[16];
|
280 | 585f8587 | bellard | uint8_t tmp[16];
|
281 | 585f8587 | bellard | for(i=0;i<16;i++)
|
282 | 585f8587 | bellard | in[i] = i;
|
283 | 585f8587 | bellard | AES_encrypt(in, tmp, &s->aes_encrypt_key);
|
284 | 585f8587 | bellard | AES_decrypt(tmp, out, &s->aes_decrypt_key);
|
285 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
286 | 585f8587 | bellard | printf(" %02x", tmp[i]);
|
287 | 585f8587 | bellard | printf("\n");
|
288 | 585f8587 | bellard | for(i = 0; i < 16; i++)
|
289 | 585f8587 | bellard | printf(" %02x", out[i]);
|
290 | 585f8587 | bellard | printf("\n");
|
291 | 585f8587 | bellard | }
|
292 | 585f8587 | bellard | #endif
|
293 | 585f8587 | bellard | return 0; |
294 | 585f8587 | bellard | } |
295 | 585f8587 | bellard | |
296 | 5fafdf24 | ths | static int qcow_is_allocated(BlockDriverState *bs, int64_t sector_num, |
297 | 585f8587 | bellard | int nb_sectors, int *pnum) |
298 | 585f8587 | bellard | { |
299 | 585f8587 | bellard | uint64_t cluster_offset; |
300 | 1c46efaa | Kevin Wolf | int ret;
|
301 | 585f8587 | bellard | |
302 | 095a9c58 | aliguori | *pnum = nb_sectors; |
303 | 1c46efaa | Kevin Wolf | /* FIXME We can get errors here, but the bdrv_is_allocated interface can't
|
304 | 1c46efaa | Kevin Wolf | * pass them on today */
|
305 | 1c46efaa | Kevin Wolf | ret = qcow2_get_cluster_offset(bs, sector_num << 9, pnum, &cluster_offset);
|
306 | 1c46efaa | Kevin Wolf | if (ret < 0) { |
307 | 1c46efaa | Kevin Wolf | *pnum = 0;
|
308 | 1c46efaa | Kevin Wolf | } |
309 | 095a9c58 | aliguori | |
310 | 585f8587 | bellard | return (cluster_offset != 0); |
311 | 585f8587 | bellard | } |
312 | 585f8587 | bellard | |
313 | a9465922 | bellard | /* handle reading after the end of the backing file */
|
314 | ed6ccf0f | Kevin Wolf | int qcow2_backing_read1(BlockDriverState *bs,
|
315 | 45aba42f | Kevin Wolf | int64_t sector_num, uint8_t *buf, int nb_sectors)
|
316 | a9465922 | bellard | { |
317 | a9465922 | bellard | int n1;
|
318 | a9465922 | bellard | if ((sector_num + nb_sectors) <= bs->total_sectors)
|
319 | a9465922 | bellard | return nb_sectors;
|
320 | a9465922 | bellard | if (sector_num >= bs->total_sectors)
|
321 | a9465922 | bellard | n1 = 0;
|
322 | a9465922 | bellard | else
|
323 | a9465922 | bellard | n1 = bs->total_sectors - sector_num; |
324 | a9465922 | bellard | memset(buf + n1 * 512, 0, 512 * (nb_sectors - n1)); |
325 | a9465922 | bellard | return n1;
|
326 | a9465922 | bellard | } |
327 | a9465922 | bellard | |
328 | ce1a14dc | pbrook | typedef struct QCowAIOCB { |
329 | ce1a14dc | pbrook | BlockDriverAIOCB common; |
330 | 585f8587 | bellard | int64_t sector_num; |
331 | f141eafe | aliguori | QEMUIOVector *qiov; |
332 | 585f8587 | bellard | uint8_t *buf; |
333 | f141eafe | aliguori | void *orig_buf;
|
334 | 7b88e48b | Christoph Hellwig | int remaining_sectors;
|
335 | 7b88e48b | Christoph Hellwig | int cur_nr_sectors; /* number of sectors in current iteration */ |
336 | 585f8587 | bellard | uint64_t cluster_offset; |
337 | 5fafdf24 | ths | uint8_t *cluster_data; |
338 | 585f8587 | bellard | BlockDriverAIOCB *hd_aiocb; |
339 | c87c0672 | aliguori | struct iovec hd_iov;
|
340 | c87c0672 | aliguori | QEMUIOVector hd_qiov; |
341 | 1490791f | aliguori | QEMUBH *bh; |
342 | e976c6a1 | aliguori | QCowL2Meta l2meta; |
343 | 72cf2d4f | Blue Swirl | QLIST_ENTRY(QCowAIOCB) next_depend; |
344 | 585f8587 | bellard | } QCowAIOCB; |
345 | 585f8587 | bellard | |
346 | c16b5a2c | Christoph Hellwig | static void qcow_aio_cancel(BlockDriverAIOCB *blockacb) |
347 | c16b5a2c | Christoph Hellwig | { |
348 | b666d239 | Kevin Wolf | QCowAIOCB *acb = container_of(blockacb, QCowAIOCB, common); |
349 | c16b5a2c | Christoph Hellwig | if (acb->hd_aiocb)
|
350 | c16b5a2c | Christoph Hellwig | bdrv_aio_cancel(acb->hd_aiocb); |
351 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
352 | c16b5a2c | Christoph Hellwig | } |
353 | c16b5a2c | Christoph Hellwig | |
354 | c16b5a2c | Christoph Hellwig | static AIOPool qcow_aio_pool = {
|
355 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(QCowAIOCB),
|
356 | c16b5a2c | Christoph Hellwig | .cancel = qcow_aio_cancel, |
357 | c16b5a2c | Christoph Hellwig | }; |
358 | c16b5a2c | Christoph Hellwig | |
359 | 1490791f | aliguori | static void qcow_aio_read_cb(void *opaque, int ret); |
360 | 1490791f | aliguori | static void qcow_aio_read_bh(void *opaque) |
361 | 1490791f | aliguori | { |
362 | 1490791f | aliguori | QCowAIOCB *acb = opaque; |
363 | 1490791f | aliguori | qemu_bh_delete(acb->bh); |
364 | 1490791f | aliguori | acb->bh = NULL;
|
365 | 1490791f | aliguori | qcow_aio_read_cb(opaque, 0);
|
366 | 1490791f | aliguori | } |
367 | 1490791f | aliguori | |
368 | a32ef786 | aliguori | static int qcow_schedule_bh(QEMUBHFunc *cb, QCowAIOCB *acb) |
369 | a32ef786 | aliguori | { |
370 | a32ef786 | aliguori | if (acb->bh)
|
371 | a32ef786 | aliguori | return -EIO;
|
372 | a32ef786 | aliguori | |
373 | a32ef786 | aliguori | acb->bh = qemu_bh_new(cb, acb); |
374 | a32ef786 | aliguori | if (!acb->bh)
|
375 | a32ef786 | aliguori | return -EIO;
|
376 | a32ef786 | aliguori | |
377 | a32ef786 | aliguori | qemu_bh_schedule(acb->bh); |
378 | a32ef786 | aliguori | |
379 | a32ef786 | aliguori | return 0; |
380 | a32ef786 | aliguori | } |
381 | a32ef786 | aliguori | |
382 | 585f8587 | bellard | static void qcow_aio_read_cb(void *opaque, int ret) |
383 | 585f8587 | bellard | { |
384 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
385 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
386 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
387 | a9465922 | bellard | int index_in_cluster, n1;
|
388 | 585f8587 | bellard | |
389 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
390 | f141eafe | aliguori | if (ret < 0) |
391 | f141eafe | aliguori | goto done;
|
392 | 585f8587 | bellard | |
393 | 585f8587 | bellard | /* post process the read buffer */
|
394 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
395 | 585f8587 | bellard | /* nothing to do */
|
396 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
397 | 585f8587 | bellard | /* nothing to do */
|
398 | 585f8587 | bellard | } else {
|
399 | 585f8587 | bellard | if (s->crypt_method) {
|
400 | ed6ccf0f | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->buf, acb->buf, |
401 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors, 0,
|
402 | 585f8587 | bellard | &s->aes_decrypt_key); |
403 | 585f8587 | bellard | } |
404 | 585f8587 | bellard | } |
405 | 585f8587 | bellard | |
406 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors -= acb->cur_nr_sectors; |
407 | 7b88e48b | Christoph Hellwig | acb->sector_num += acb->cur_nr_sectors; |
408 | 7b88e48b | Christoph Hellwig | acb->buf += acb->cur_nr_sectors * 512;
|
409 | 585f8587 | bellard | |
410 | 7b88e48b | Christoph Hellwig | if (acb->remaining_sectors == 0) { |
411 | 585f8587 | bellard | /* request completed */
|
412 | f141eafe | aliguori | ret = 0;
|
413 | f141eafe | aliguori | goto done;
|
414 | 585f8587 | bellard | } |
415 | 3b46e624 | ths | |
416 | 585f8587 | bellard | /* prepare next AIO request */
|
417 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors = acb->remaining_sectors; |
418 | 1c46efaa | Kevin Wolf | ret = qcow2_get_cluster_offset(bs, acb->sector_num << 9,
|
419 | 1c46efaa | Kevin Wolf | &acb->cur_nr_sectors, &acb->cluster_offset); |
420 | 1c46efaa | Kevin Wolf | if (ret < 0) { |
421 | 1c46efaa | Kevin Wolf | goto done;
|
422 | 1c46efaa | Kevin Wolf | } |
423 | 1c46efaa | Kevin Wolf | |
424 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
425 | ce1a14dc | pbrook | |
426 | ce1a14dc | pbrook | if (!acb->cluster_offset) {
|
427 | 585f8587 | bellard | if (bs->backing_hd) {
|
428 | 585f8587 | bellard | /* read from the base image */
|
429 | ed6ccf0f | Kevin Wolf | n1 = qcow2_backing_read1(bs->backing_hd, acb->sector_num, |
430 | 7b88e48b | Christoph Hellwig | acb->buf, acb->cur_nr_sectors); |
431 | a9465922 | bellard | if (n1 > 0) { |
432 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
433 | 7b88e48b | Christoph Hellwig | acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
|
434 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
435 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_READ_BACKING_AIO); |
436 | c87c0672 | aliguori | acb->hd_aiocb = bdrv_aio_readv(bs->backing_hd, acb->sector_num, |
437 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
438 | c87c0672 | aliguori | qcow_aio_read_cb, acb); |
439 | ce1a14dc | pbrook | if (acb->hd_aiocb == NULL) |
440 | f141eafe | aliguori | goto done;
|
441 | a9465922 | bellard | } else {
|
442 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
443 | a32ef786 | aliguori | if (ret < 0) |
444 | f141eafe | aliguori | goto done;
|
445 | a9465922 | bellard | } |
446 | 585f8587 | bellard | } else {
|
447 | 585f8587 | bellard | /* Note: in this case, no need to wait */
|
448 | 7b88e48b | Christoph Hellwig | memset(acb->buf, 0, 512 * acb->cur_nr_sectors); |
449 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
450 | a32ef786 | aliguori | if (ret < 0) |
451 | f141eafe | aliguori | goto done;
|
452 | 585f8587 | bellard | } |
453 | ce1a14dc | pbrook | } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) { |
454 | 585f8587 | bellard | /* add AIO support for compressed blocks ? */
|
455 | 66f82cee | Kevin Wolf | if (qcow2_decompress_cluster(bs, acb->cluster_offset) < 0) |
456 | f141eafe | aliguori | goto done;
|
457 | 7b88e48b | Christoph Hellwig | memcpy(acb->buf, s->cluster_cache + index_in_cluster * 512,
|
458 | 7b88e48b | Christoph Hellwig | 512 * acb->cur_nr_sectors);
|
459 | a32ef786 | aliguori | ret = qcow_schedule_bh(qcow_aio_read_bh, acb); |
460 | a32ef786 | aliguori | if (ret < 0) |
461 | f141eafe | aliguori | goto done;
|
462 | 585f8587 | bellard | } else {
|
463 | ce1a14dc | pbrook | if ((acb->cluster_offset & 511) != 0) { |
464 | 585f8587 | bellard | ret = -EIO; |
465 | f141eafe | aliguori | goto done;
|
466 | 585f8587 | bellard | } |
467 | c87c0672 | aliguori | |
468 | 3f4cb3d3 | blueswir1 | acb->hd_iov.iov_base = (void *)acb->buf;
|
469 | 7b88e48b | Christoph Hellwig | acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
|
470 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
471 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO); |
472 | 66f82cee | Kevin Wolf | acb->hd_aiocb = bdrv_aio_readv(bs->file, |
473 | 5fafdf24 | ths | (acb->cluster_offset >> 9) + index_in_cluster,
|
474 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
475 | 7b88e48b | Christoph Hellwig | qcow_aio_read_cb, acb); |
476 | 171e3d6b | Kevin Wolf | if (acb->hd_aiocb == NULL) { |
477 | 171e3d6b | Kevin Wolf | ret = -EIO; |
478 | f141eafe | aliguori | goto done;
|
479 | 171e3d6b | Kevin Wolf | } |
480 | f141eafe | aliguori | } |
481 | f141eafe | aliguori | |
482 | f141eafe | aliguori | return;
|
483 | f141eafe | aliguori | done:
|
484 | f141eafe | aliguori | if (acb->qiov->niov > 1) { |
485 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->orig_buf, acb->qiov->size); |
486 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
487 | 585f8587 | bellard | } |
488 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
489 | f141eafe | aliguori | qemu_aio_release(acb); |
490 | 585f8587 | bellard | } |
491 | 585f8587 | bellard | |
492 | ce1a14dc | pbrook | static QCowAIOCB *qcow_aio_setup(BlockDriverState *bs,
|
493 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
494 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque, int is_write) |
495 | 585f8587 | bellard | { |
496 | ce1a14dc | pbrook | QCowAIOCB *acb; |
497 | ce1a14dc | pbrook | |
498 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&qcow_aio_pool, bs, cb, opaque); |
499 | ce1a14dc | pbrook | if (!acb)
|
500 | ce1a14dc | pbrook | return NULL; |
501 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
502 | ce1a14dc | pbrook | acb->sector_num = sector_num; |
503 | f141eafe | aliguori | acb->qiov = qiov; |
504 | f141eafe | aliguori | if (qiov->niov > 1) { |
505 | e268ca52 | aliguori | acb->buf = acb->orig_buf = qemu_blockalign(bs, qiov->size); |
506 | f141eafe | aliguori | if (is_write)
|
507 | f141eafe | aliguori | qemu_iovec_to_buffer(qiov, acb->buf); |
508 | 3f4cb3d3 | blueswir1 | } else {
|
509 | 3f4cb3d3 | blueswir1 | acb->buf = (uint8_t *)qiov->iov->iov_base; |
510 | 3f4cb3d3 | blueswir1 | } |
511 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors = nb_sectors; |
512 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors = 0;
|
513 | ce1a14dc | pbrook | acb->cluster_offset = 0;
|
514 | e976c6a1 | aliguori | acb->l2meta.nb_clusters = 0;
|
515 | 72cf2d4f | Blue Swirl | QLIST_INIT(&acb->l2meta.dependent_requests); |
516 | ce1a14dc | pbrook | return acb;
|
517 | ce1a14dc | pbrook | } |
518 | ce1a14dc | pbrook | |
519 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_readv(BlockDriverState *bs,
|
520 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
521 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
522 | ce1a14dc | pbrook | { |
523 | ce1a14dc | pbrook | QCowAIOCB *acb; |
524 | ce1a14dc | pbrook | |
525 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 0);
|
526 | ce1a14dc | pbrook | if (!acb)
|
527 | ce1a14dc | pbrook | return NULL; |
528 | 585f8587 | bellard | |
529 | 585f8587 | bellard | qcow_aio_read_cb(acb, 0);
|
530 | ce1a14dc | pbrook | return &acb->common;
|
531 | 585f8587 | bellard | } |
532 | 585f8587 | bellard | |
533 | f214978a | Kevin Wolf | static void qcow_aio_write_cb(void *opaque, int ret); |
534 | f214978a | Kevin Wolf | |
535 | f214978a | Kevin Wolf | static void run_dependent_requests(QCowL2Meta *m) |
536 | f214978a | Kevin Wolf | { |
537 | f214978a | Kevin Wolf | QCowAIOCB *req; |
538 | f214978a | Kevin Wolf | QCowAIOCB *next; |
539 | f214978a | Kevin Wolf | |
540 | f214978a | Kevin Wolf | /* Take the request off the list of running requests */
|
541 | f214978a | Kevin Wolf | if (m->nb_clusters != 0) { |
542 | 72cf2d4f | Blue Swirl | QLIST_REMOVE(m, next_in_flight); |
543 | f214978a | Kevin Wolf | } |
544 | f214978a | Kevin Wolf | |
545 | d4c146f0 | Stefan Hajnoczi | /* Restart all dependent requests */
|
546 | d4c146f0 | Stefan Hajnoczi | QLIST_FOREACH_SAFE(req, &m->dependent_requests, next_depend, next) { |
547 | f214978a | Kevin Wolf | qcow_aio_write_cb(req, 0);
|
548 | f214978a | Kevin Wolf | } |
549 | f214978a | Kevin Wolf | |
550 | f214978a | Kevin Wolf | /* Empty the list for the next part of the request */
|
551 | 72cf2d4f | Blue Swirl | QLIST_INIT(&m->dependent_requests); |
552 | f214978a | Kevin Wolf | } |
553 | f214978a | Kevin Wolf | |
554 | 585f8587 | bellard | static void qcow_aio_write_cb(void *opaque, int ret) |
555 | 585f8587 | bellard | { |
556 | ce1a14dc | pbrook | QCowAIOCB *acb = opaque; |
557 | ce1a14dc | pbrook | BlockDriverState *bs = acb->common.bs; |
558 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
559 | 585f8587 | bellard | int index_in_cluster;
|
560 | 585f8587 | bellard | const uint8_t *src_buf;
|
561 | 095a9c58 | aliguori | int n_end;
|
562 | ce1a14dc | pbrook | |
563 | ce1a14dc | pbrook | acb->hd_aiocb = NULL;
|
564 | ce1a14dc | pbrook | |
565 | f214978a | Kevin Wolf | if (ret >= 0) { |
566 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, &acb->l2meta); |
567 | f214978a | Kevin Wolf | } |
568 | f214978a | Kevin Wolf | |
569 | f214978a | Kevin Wolf | run_dependent_requests(&acb->l2meta); |
570 | f214978a | Kevin Wolf | |
571 | f141eafe | aliguori | if (ret < 0) |
572 | f141eafe | aliguori | goto done;
|
573 | 585f8587 | bellard | |
574 | 7b88e48b | Christoph Hellwig | acb->remaining_sectors -= acb->cur_nr_sectors; |
575 | 7b88e48b | Christoph Hellwig | acb->sector_num += acb->cur_nr_sectors; |
576 | 7b88e48b | Christoph Hellwig | acb->buf += acb->cur_nr_sectors * 512;
|
577 | 585f8587 | bellard | |
578 | 7b88e48b | Christoph Hellwig | if (acb->remaining_sectors == 0) { |
579 | 585f8587 | bellard | /* request completed */
|
580 | f141eafe | aliguori | ret = 0;
|
581 | f141eafe | aliguori | goto done;
|
582 | 585f8587 | bellard | } |
583 | 3b46e624 | ths | |
584 | ce1a14dc | pbrook | index_in_cluster = acb->sector_num & (s->cluster_sectors - 1);
|
585 | 7b88e48b | Christoph Hellwig | n_end = index_in_cluster + acb->remaining_sectors; |
586 | 095a9c58 | aliguori | if (s->crypt_method &&
|
587 | 095a9c58 | aliguori | n_end > QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors) |
588 | 095a9c58 | aliguori | n_end = QCOW_MAX_CRYPT_CLUSTERS * s->cluster_sectors; |
589 | 095a9c58 | aliguori | |
590 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_offset(bs, acb->sector_num << 9,
|
591 | 7b88e48b | Christoph Hellwig | index_in_cluster, n_end, &acb->cur_nr_sectors, &acb->l2meta); |
592 | 148da7ea | Kevin Wolf | if (ret < 0) { |
593 | 148da7ea | Kevin Wolf | goto done;
|
594 | 148da7ea | Kevin Wolf | } |
595 | 148da7ea | Kevin Wolf | |
596 | 148da7ea | Kevin Wolf | acb->cluster_offset = acb->l2meta.cluster_offset; |
597 | f214978a | Kevin Wolf | |
598 | f214978a | Kevin Wolf | /* Need to wait for another request? If so, we are done for now. */
|
599 | 148da7ea | Kevin Wolf | if (acb->l2meta.nb_clusters == 0 && acb->l2meta.depends_on != NULL) { |
600 | 72cf2d4f | Blue Swirl | QLIST_INSERT_HEAD(&acb->l2meta.depends_on->dependent_requests, |
601 | f214978a | Kevin Wolf | acb, next_depend); |
602 | f214978a | Kevin Wolf | return;
|
603 | f214978a | Kevin Wolf | } |
604 | f214978a | Kevin Wolf | |
605 | 148da7ea | Kevin Wolf | assert((acb->cluster_offset & 511) == 0); |
606 | 148da7ea | Kevin Wolf | |
607 | 585f8587 | bellard | if (s->crypt_method) {
|
608 | ce1a14dc | pbrook | if (!acb->cluster_data) {
|
609 | 095a9c58 | aliguori | acb->cluster_data = qemu_mallocz(QCOW_MAX_CRYPT_CLUSTERS * |
610 | 095a9c58 | aliguori | s->cluster_size); |
611 | 585f8587 | bellard | } |
612 | ed6ccf0f | Kevin Wolf | qcow2_encrypt_sectors(s, acb->sector_num, acb->cluster_data, acb->buf, |
613 | 7b88e48b | Christoph Hellwig | acb->cur_nr_sectors, 1, &s->aes_encrypt_key);
|
614 | ce1a14dc | pbrook | src_buf = acb->cluster_data; |
615 | 585f8587 | bellard | } else {
|
616 | ce1a14dc | pbrook | src_buf = acb->buf; |
617 | 585f8587 | bellard | } |
618 | c87c0672 | aliguori | acb->hd_iov.iov_base = (void *)src_buf;
|
619 | 7b88e48b | Christoph Hellwig | acb->hd_iov.iov_len = acb->cur_nr_sectors * 512;
|
620 | c87c0672 | aliguori | qemu_iovec_init_external(&acb->hd_qiov, &acb->hd_iov, 1);
|
621 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); |
622 | 66f82cee | Kevin Wolf | acb->hd_aiocb = bdrv_aio_writev(bs->file, |
623 | c87c0672 | aliguori | (acb->cluster_offset >> 9) + index_in_cluster,
|
624 | 7b88e48b | Christoph Hellwig | &acb->hd_qiov, acb->cur_nr_sectors, |
625 | c87c0672 | aliguori | qcow_aio_write_cb, acb); |
626 | 171e3d6b | Kevin Wolf | if (acb->hd_aiocb == NULL) { |
627 | 171e3d6b | Kevin Wolf | ret = -EIO; |
628 | c644db3d | Kevin Wolf | goto fail;
|
629 | 171e3d6b | Kevin Wolf | } |
630 | f141eafe | aliguori | |
631 | f141eafe | aliguori | return;
|
632 | f141eafe | aliguori | |
633 | c644db3d | Kevin Wolf | fail:
|
634 | c644db3d | Kevin Wolf | if (acb->l2meta.nb_clusters != 0) { |
635 | c644db3d | Kevin Wolf | QLIST_REMOVE(&acb->l2meta, next_in_flight); |
636 | c644db3d | Kevin Wolf | } |
637 | f141eafe | aliguori | done:
|
638 | f141eafe | aliguori | if (acb->qiov->niov > 1) |
639 | f141eafe | aliguori | qemu_vfree(acb->orig_buf); |
640 | f141eafe | aliguori | acb->common.cb(acb->common.opaque, ret); |
641 | f141eafe | aliguori | qemu_aio_release(acb); |
642 | 585f8587 | bellard | } |
643 | 585f8587 | bellard | |
644 | f141eafe | aliguori | static BlockDriverAIOCB *qcow_aio_writev(BlockDriverState *bs,
|
645 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
646 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
647 | 585f8587 | bellard | { |
648 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
649 | ce1a14dc | pbrook | QCowAIOCB *acb; |
650 | 3b46e624 | ths | |
651 | 585f8587 | bellard | s->cluster_cache_offset = -1; /* disable compressed cache */ |
652 | 585f8587 | bellard | |
653 | f141eafe | aliguori | acb = qcow_aio_setup(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
|
654 | ce1a14dc | pbrook | if (!acb)
|
655 | ce1a14dc | pbrook | return NULL; |
656 | 3b46e624 | ths | |
657 | 585f8587 | bellard | qcow_aio_write_cb(acb, 0);
|
658 | ce1a14dc | pbrook | return &acb->common;
|
659 | 585f8587 | bellard | } |
660 | 585f8587 | bellard | |
661 | 585f8587 | bellard | static void qcow_close(BlockDriverState *bs) |
662 | 585f8587 | bellard | { |
663 | 585f8587 | bellard | BDRVQcowState *s = bs->opaque; |
664 | 585f8587 | bellard | qemu_free(s->l1_table); |
665 | 585f8587 | bellard | qemu_free(s->l2_cache); |
666 | 585f8587 | bellard | qemu_free(s->cluster_cache); |
667 | 585f8587 | bellard | qemu_free(s->cluster_data); |
668 | ed6ccf0f | Kevin Wolf | qcow2_refcount_close(bs); |
669 | 585f8587 | bellard | } |
670 | 585f8587 | bellard | |
671 | 756e6736 | Kevin Wolf | /*
|
672 | 756e6736 | Kevin Wolf | * Updates the variable length parts of the qcow2 header, i.e. the backing file
|
673 | 756e6736 | Kevin Wolf | * name and all extensions. qcow2 was not designed to allow such changes, so if
|
674 | 756e6736 | Kevin Wolf | * we run out of space (we can only use the first cluster) this function may
|
675 | 756e6736 | Kevin Wolf | * fail.
|
676 | 756e6736 | Kevin Wolf | *
|
677 | 756e6736 | Kevin Wolf | * Returns 0 on success, -errno in error cases.
|
678 | 756e6736 | Kevin Wolf | */
|
679 | 756e6736 | Kevin Wolf | static int qcow2_update_ext_header(BlockDriverState *bs, |
680 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
681 | 756e6736 | Kevin Wolf | { |
682 | 756e6736 | Kevin Wolf | size_t backing_file_len = 0;
|
683 | 756e6736 | Kevin Wolf | size_t backing_fmt_len = 0;
|
684 | 756e6736 | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
685 | 756e6736 | Kevin Wolf | QCowExtension ext_backing_fmt = {0, 0}; |
686 | 756e6736 | Kevin Wolf | int ret;
|
687 | 756e6736 | Kevin Wolf | |
688 | 756e6736 | Kevin Wolf | /* Backing file format doesn't make sense without a backing file */
|
689 | 756e6736 | Kevin Wolf | if (backing_fmt && !backing_file) {
|
690 | 756e6736 | Kevin Wolf | return -EINVAL;
|
691 | 756e6736 | Kevin Wolf | } |
692 | 756e6736 | Kevin Wolf | |
693 | 756e6736 | Kevin Wolf | /* Prepare the backing file format extension if needed */
|
694 | 756e6736 | Kevin Wolf | if (backing_fmt) {
|
695 | 756e6736 | Kevin Wolf | ext_backing_fmt.len = cpu_to_be32(strlen(backing_fmt)); |
696 | 756e6736 | Kevin Wolf | ext_backing_fmt.magic = cpu_to_be32(QCOW_EXT_MAGIC_BACKING_FORMAT); |
697 | 756e6736 | Kevin Wolf | backing_fmt_len = ((sizeof(ext_backing_fmt)
|
698 | 756e6736 | Kevin Wolf | + strlen(backing_fmt) + 7) & ~7); |
699 | 756e6736 | Kevin Wolf | } |
700 | 756e6736 | Kevin Wolf | |
701 | 756e6736 | Kevin Wolf | /* Check if we can fit the new header into the first cluster */
|
702 | 756e6736 | Kevin Wolf | if (backing_file) {
|
703 | 756e6736 | Kevin Wolf | backing_file_len = strlen(backing_file); |
704 | 756e6736 | Kevin Wolf | } |
705 | 756e6736 | Kevin Wolf | |
706 | 756e6736 | Kevin Wolf | size_t header_size = sizeof(QCowHeader) + backing_file_len
|
707 | 756e6736 | Kevin Wolf | + backing_fmt_len; |
708 | 756e6736 | Kevin Wolf | |
709 | 756e6736 | Kevin Wolf | if (header_size > s->cluster_size) {
|
710 | 756e6736 | Kevin Wolf | return -ENOSPC;
|
711 | 756e6736 | Kevin Wolf | } |
712 | 756e6736 | Kevin Wolf | |
713 | 756e6736 | Kevin Wolf | /* Rewrite backing file name and qcow2 extensions */
|
714 | 756e6736 | Kevin Wolf | size_t ext_size = header_size - sizeof(QCowHeader);
|
715 | 756e6736 | Kevin Wolf | uint8_t buf[ext_size]; |
716 | 756e6736 | Kevin Wolf | size_t offset = 0;
|
717 | 756e6736 | Kevin Wolf | size_t backing_file_offset = 0;
|
718 | 756e6736 | Kevin Wolf | |
719 | 756e6736 | Kevin Wolf | if (backing_file) {
|
720 | 756e6736 | Kevin Wolf | if (backing_fmt) {
|
721 | 756e6736 | Kevin Wolf | int padding = backing_fmt_len -
|
722 | 756e6736 | Kevin Wolf | (sizeof(ext_backing_fmt) + strlen(backing_fmt));
|
723 | 756e6736 | Kevin Wolf | |
724 | 756e6736 | Kevin Wolf | memcpy(buf + offset, &ext_backing_fmt, sizeof(ext_backing_fmt));
|
725 | 756e6736 | Kevin Wolf | offset += sizeof(ext_backing_fmt);
|
726 | 756e6736 | Kevin Wolf | |
727 | 756e6736 | Kevin Wolf | memcpy(buf + offset, backing_fmt, strlen(backing_fmt)); |
728 | 756e6736 | Kevin Wolf | offset += strlen(backing_fmt); |
729 | 756e6736 | Kevin Wolf | |
730 | 756e6736 | Kevin Wolf | memset(buf + offset, 0, padding);
|
731 | 756e6736 | Kevin Wolf | offset += padding; |
732 | 756e6736 | Kevin Wolf | } |
733 | 756e6736 | Kevin Wolf | |
734 | 756e6736 | Kevin Wolf | memcpy(buf + offset, backing_file, backing_file_len); |
735 | 756e6736 | Kevin Wolf | backing_file_offset = sizeof(QCowHeader) + offset;
|
736 | 756e6736 | Kevin Wolf | } |
737 | 756e6736 | Kevin Wolf | |
738 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, sizeof(QCowHeader), buf, ext_size);
|
739 | 756e6736 | Kevin Wolf | if (ret < 0) { |
740 | 756e6736 | Kevin Wolf | goto fail;
|
741 | 756e6736 | Kevin Wolf | } |
742 | 756e6736 | Kevin Wolf | |
743 | 756e6736 | Kevin Wolf | /* Update header fields */
|
744 | 756e6736 | Kevin Wolf | uint64_t be_backing_file_offset = cpu_to_be64(backing_file_offset); |
745 | 756e6736 | Kevin Wolf | uint32_t be_backing_file_size = cpu_to_be32(backing_file_len); |
746 | 756e6736 | Kevin Wolf | |
747 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_offset), |
748 | 756e6736 | Kevin Wolf | &be_backing_file_offset, sizeof(uint64_t));
|
749 | 756e6736 | Kevin Wolf | if (ret < 0) { |
750 | 756e6736 | Kevin Wolf | goto fail;
|
751 | 756e6736 | Kevin Wolf | } |
752 | 756e6736 | Kevin Wolf | |
753 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, backing_file_size), |
754 | 756e6736 | Kevin Wolf | &be_backing_file_size, sizeof(uint32_t));
|
755 | 756e6736 | Kevin Wolf | if (ret < 0) { |
756 | 756e6736 | Kevin Wolf | goto fail;
|
757 | 756e6736 | Kevin Wolf | } |
758 | 756e6736 | Kevin Wolf | |
759 | 756e6736 | Kevin Wolf | ret = 0;
|
760 | 756e6736 | Kevin Wolf | fail:
|
761 | 756e6736 | Kevin Wolf | return ret;
|
762 | 756e6736 | Kevin Wolf | } |
763 | 756e6736 | Kevin Wolf | |
764 | 756e6736 | Kevin Wolf | static int qcow2_change_backing_file(BlockDriverState *bs, |
765 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
766 | 756e6736 | Kevin Wolf | { |
767 | 756e6736 | Kevin Wolf | return qcow2_update_ext_header(bs, backing_file, backing_fmt);
|
768 | 756e6736 | Kevin Wolf | } |
769 | 756e6736 | Kevin Wolf | |
770 | 73c632ed | Kevin Wolf | static int get_bits_from_size(size_t size) |
771 | 73c632ed | Kevin Wolf | { |
772 | 73c632ed | Kevin Wolf | int res = 0; |
773 | 73c632ed | Kevin Wolf | |
774 | 73c632ed | Kevin Wolf | if (size == 0) { |
775 | 73c632ed | Kevin Wolf | return -1; |
776 | 73c632ed | Kevin Wolf | } |
777 | 73c632ed | Kevin Wolf | |
778 | 73c632ed | Kevin Wolf | while (size != 1) { |
779 | 73c632ed | Kevin Wolf | /* Not a power of two */
|
780 | 73c632ed | Kevin Wolf | if (size & 1) { |
781 | 73c632ed | Kevin Wolf | return -1; |
782 | 73c632ed | Kevin Wolf | } |
783 | 73c632ed | Kevin Wolf | |
784 | 73c632ed | Kevin Wolf | size >>= 1;
|
785 | 73c632ed | Kevin Wolf | res++; |
786 | 73c632ed | Kevin Wolf | } |
787 | 73c632ed | Kevin Wolf | |
788 | 73c632ed | Kevin Wolf | return res;
|
789 | 73c632ed | Kevin Wolf | } |
790 | 73c632ed | Kevin Wolf | |
791 | a35e1c17 | Kevin Wolf | |
792 | a35e1c17 | Kevin Wolf | static int preallocate(BlockDriverState *bs) |
793 | a35e1c17 | Kevin Wolf | { |
794 | a35e1c17 | Kevin Wolf | uint64_t nb_sectors; |
795 | a35e1c17 | Kevin Wolf | uint64_t offset; |
796 | a35e1c17 | Kevin Wolf | int num;
|
797 | 148da7ea | Kevin Wolf | int ret;
|
798 | a35e1c17 | Kevin Wolf | QCowL2Meta meta; |
799 | a35e1c17 | Kevin Wolf | |
800 | a35e1c17 | Kevin Wolf | nb_sectors = bdrv_getlength(bs) >> 9;
|
801 | a35e1c17 | Kevin Wolf | offset = 0;
|
802 | 72cf2d4f | Blue Swirl | QLIST_INIT(&meta.dependent_requests); |
803 | 148da7ea | Kevin Wolf | meta.cluster_offset = 0;
|
804 | a35e1c17 | Kevin Wolf | |
805 | a35e1c17 | Kevin Wolf | while (nb_sectors) {
|
806 | a35e1c17 | Kevin Wolf | num = MIN(nb_sectors, INT_MAX >> 9);
|
807 | 148da7ea | Kevin Wolf | ret = qcow2_alloc_cluster_offset(bs, offset, 0, num, &num, &meta);
|
808 | 148da7ea | Kevin Wolf | if (ret < 0) { |
809 | 19dbcbf7 | Kevin Wolf | return ret;
|
810 | a35e1c17 | Kevin Wolf | } |
811 | a35e1c17 | Kevin Wolf | |
812 | 19dbcbf7 | Kevin Wolf | ret = qcow2_alloc_cluster_link_l2(bs, &meta); |
813 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
814 | 148da7ea | Kevin Wolf | qcow2_free_any_clusters(bs, meta.cluster_offset, meta.nb_clusters); |
815 | 19dbcbf7 | Kevin Wolf | return ret;
|
816 | a35e1c17 | Kevin Wolf | } |
817 | a35e1c17 | Kevin Wolf | |
818 | f214978a | Kevin Wolf | /* There are no dependent requests, but we need to remove our request
|
819 | f214978a | Kevin Wolf | * from the list of in-flight requests */
|
820 | f214978a | Kevin Wolf | run_dependent_requests(&meta); |
821 | f214978a | Kevin Wolf | |
822 | a35e1c17 | Kevin Wolf | /* TODO Preallocate data if requested */
|
823 | a35e1c17 | Kevin Wolf | |
824 | a35e1c17 | Kevin Wolf | nb_sectors -= num; |
825 | a35e1c17 | Kevin Wolf | offset += num << 9;
|
826 | a35e1c17 | Kevin Wolf | } |
827 | a35e1c17 | Kevin Wolf | |
828 | a35e1c17 | Kevin Wolf | /*
|
829 | a35e1c17 | Kevin Wolf | * It is expected that the image file is large enough to actually contain
|
830 | a35e1c17 | Kevin Wolf | * all of the allocated clusters (otherwise we get failing reads after
|
831 | a35e1c17 | Kevin Wolf | * EOF). Extend the image to the last allocated sector.
|
832 | a35e1c17 | Kevin Wolf | */
|
833 | 148da7ea | Kevin Wolf | if (meta.cluster_offset != 0) { |
834 | ea80b906 | Kevin Wolf | uint8_t buf[512];
|
835 | ea80b906 | Kevin Wolf | memset(buf, 0, 512); |
836 | 19dbcbf7 | Kevin Wolf | ret = bdrv_write(bs->file, (meta.cluster_offset >> 9) + num - 1, buf, 1); |
837 | 19dbcbf7 | Kevin Wolf | if (ret < 0) { |
838 | 19dbcbf7 | Kevin Wolf | return ret;
|
839 | 19dbcbf7 | Kevin Wolf | } |
840 | a35e1c17 | Kevin Wolf | } |
841 | a35e1c17 | Kevin Wolf | |
842 | a35e1c17 | Kevin Wolf | return 0; |
843 | a35e1c17 | Kevin Wolf | } |
844 | a35e1c17 | Kevin Wolf | |
845 | de5f3f40 | Kevin Wolf | static int qcow_create2(const char *filename, int64_t total_size, |
846 | de5f3f40 | Kevin Wolf | const char *backing_file, const char *backing_format, |
847 | de5f3f40 | Kevin Wolf | int flags, size_t cluster_size, int prealloc) |
848 | de5f3f40 | Kevin Wolf | { |
849 | de5f3f40 | Kevin Wolf | |
850 | de5f3f40 | Kevin Wolf | int fd, header_size, backing_filename_len, l1_size, i, shift, l2_bits;
|
851 | de5f3f40 | Kevin Wolf | int ref_clusters, reftable_clusters, backing_format_len = 0; |
852 | de5f3f40 | Kevin Wolf | int rounded_ext_bf_len = 0; |
853 | de5f3f40 | Kevin Wolf | QCowHeader header; |
854 | de5f3f40 | Kevin Wolf | uint64_t tmp, offset; |
855 | de5f3f40 | Kevin Wolf | uint64_t old_ref_clusters; |
856 | de5f3f40 | Kevin Wolf | QCowCreateState s1, *s = &s1; |
857 | de5f3f40 | Kevin Wolf | QCowExtension ext_bf = {0, 0}; |
858 | de5f3f40 | Kevin Wolf | int ret;
|
859 | de5f3f40 | Kevin Wolf | |
860 | de5f3f40 | Kevin Wolf | memset(s, 0, sizeof(*s)); |
861 | de5f3f40 | Kevin Wolf | |
862 | de5f3f40 | Kevin Wolf | fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY, 0644);
|
863 | de5f3f40 | Kevin Wolf | if (fd < 0) |
864 | de5f3f40 | Kevin Wolf | return -errno;
|
865 | de5f3f40 | Kevin Wolf | memset(&header, 0, sizeof(header)); |
866 | de5f3f40 | Kevin Wolf | header.magic = cpu_to_be32(QCOW_MAGIC); |
867 | de5f3f40 | Kevin Wolf | header.version = cpu_to_be32(QCOW_VERSION); |
868 | de5f3f40 | Kevin Wolf | header.size = cpu_to_be64(total_size * 512);
|
869 | de5f3f40 | Kevin Wolf | header_size = sizeof(header);
|
870 | de5f3f40 | Kevin Wolf | backing_filename_len = 0;
|
871 | de5f3f40 | Kevin Wolf | if (backing_file) {
|
872 | de5f3f40 | Kevin Wolf | if (backing_format) {
|
873 | de5f3f40 | Kevin Wolf | ext_bf.magic = QCOW_EXT_MAGIC_BACKING_FORMAT; |
874 | de5f3f40 | Kevin Wolf | backing_format_len = strlen(backing_format); |
875 | de5f3f40 | Kevin Wolf | ext_bf.len = backing_format_len; |
876 | de5f3f40 | Kevin Wolf | rounded_ext_bf_len = (sizeof(ext_bf) + ext_bf.len + 7) & ~7; |
877 | de5f3f40 | Kevin Wolf | header_size += rounded_ext_bf_len; |
878 | de5f3f40 | Kevin Wolf | } |
879 | de5f3f40 | Kevin Wolf | header.backing_file_offset = cpu_to_be64(header_size); |
880 | de5f3f40 | Kevin Wolf | backing_filename_len = strlen(backing_file); |
881 | de5f3f40 | Kevin Wolf | header.backing_file_size = cpu_to_be32(backing_filename_len); |
882 | de5f3f40 | Kevin Wolf | header_size += backing_filename_len; |
883 | de5f3f40 | Kevin Wolf | } |
884 | de5f3f40 | Kevin Wolf | |
885 | de5f3f40 | Kevin Wolf | /* Cluster size */
|
886 | de5f3f40 | Kevin Wolf | s->cluster_bits = get_bits_from_size(cluster_size); |
887 | de5f3f40 | Kevin Wolf | if (s->cluster_bits < MIN_CLUSTER_BITS ||
|
888 | de5f3f40 | Kevin Wolf | s->cluster_bits > MAX_CLUSTER_BITS) |
889 | de5f3f40 | Kevin Wolf | { |
890 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Cluster size must be a power of two between "
|
891 | de5f3f40 | Kevin Wolf | "%d and %dk\n",
|
892 | de5f3f40 | Kevin Wolf | 1 << MIN_CLUSTER_BITS,
|
893 | de5f3f40 | Kevin Wolf | 1 << (MAX_CLUSTER_BITS - 10)); |
894 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
895 | de5f3f40 | Kevin Wolf | } |
896 | de5f3f40 | Kevin Wolf | s->cluster_size = 1 << s->cluster_bits;
|
897 | de5f3f40 | Kevin Wolf | |
898 | de5f3f40 | Kevin Wolf | header.cluster_bits = cpu_to_be32(s->cluster_bits); |
899 | de5f3f40 | Kevin Wolf | header_size = (header_size + 7) & ~7; |
900 | de5f3f40 | Kevin Wolf | if (flags & BLOCK_FLAG_ENCRYPT) {
|
901 | de5f3f40 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_AES); |
902 | de5f3f40 | Kevin Wolf | } else {
|
903 | de5f3f40 | Kevin Wolf | header.crypt_method = cpu_to_be32(QCOW_CRYPT_NONE); |
904 | de5f3f40 | Kevin Wolf | } |
905 | de5f3f40 | Kevin Wolf | l2_bits = s->cluster_bits - 3;
|
906 | de5f3f40 | Kevin Wolf | shift = s->cluster_bits + l2_bits; |
907 | de5f3f40 | Kevin Wolf | l1_size = (((total_size * 512) + (1LL << shift) - 1) >> shift); |
908 | de5f3f40 | Kevin Wolf | offset = align_offset(header_size, s->cluster_size); |
909 | de5f3f40 | Kevin Wolf | s->l1_table_offset = offset; |
910 | de5f3f40 | Kevin Wolf | header.l1_table_offset = cpu_to_be64(s->l1_table_offset); |
911 | de5f3f40 | Kevin Wolf | header.l1_size = cpu_to_be32(l1_size); |
912 | de5f3f40 | Kevin Wolf | offset += align_offset(l1_size * sizeof(uint64_t), s->cluster_size);
|
913 | de5f3f40 | Kevin Wolf | |
914 | de5f3f40 | Kevin Wolf | /* count how many refcount blocks needed */
|
915 | de5f3f40 | Kevin Wolf | |
916 | de5f3f40 | Kevin Wolf | #define NUM_CLUSTERS(bytes) \
|
917 | de5f3f40 | Kevin Wolf | (((bytes) + (s->cluster_size) - 1) / (s->cluster_size))
|
918 | de5f3f40 | Kevin Wolf | |
919 | de5f3f40 | Kevin Wolf | ref_clusters = NUM_CLUSTERS(NUM_CLUSTERS(offset) * sizeof(uint16_t));
|
920 | de5f3f40 | Kevin Wolf | |
921 | de5f3f40 | Kevin Wolf | do {
|
922 | de5f3f40 | Kevin Wolf | uint64_t image_clusters; |
923 | de5f3f40 | Kevin Wolf | old_ref_clusters = ref_clusters; |
924 | de5f3f40 | Kevin Wolf | |
925 | de5f3f40 | Kevin Wolf | /* Number of clusters used for the refcount table */
|
926 | de5f3f40 | Kevin Wolf | reftable_clusters = NUM_CLUSTERS(ref_clusters * sizeof(uint64_t));
|
927 | de5f3f40 | Kevin Wolf | |
928 | de5f3f40 | Kevin Wolf | /* Number of clusters that the whole image will have */
|
929 | de5f3f40 | Kevin Wolf | image_clusters = NUM_CLUSTERS(offset) + ref_clusters |
930 | de5f3f40 | Kevin Wolf | + reftable_clusters; |
931 | de5f3f40 | Kevin Wolf | |
932 | de5f3f40 | Kevin Wolf | /* Number of refcount blocks needed for the image */
|
933 | de5f3f40 | Kevin Wolf | ref_clusters = NUM_CLUSTERS(image_clusters * sizeof(uint16_t));
|
934 | de5f3f40 | Kevin Wolf | |
935 | de5f3f40 | Kevin Wolf | } while (ref_clusters != old_ref_clusters);
|
936 | de5f3f40 | Kevin Wolf | |
937 | de5f3f40 | Kevin Wolf | s->refcount_table = qemu_mallocz(reftable_clusters * s->cluster_size); |
938 | de5f3f40 | Kevin Wolf | |
939 | de5f3f40 | Kevin Wolf | s->refcount_table_offset = offset; |
940 | de5f3f40 | Kevin Wolf | header.refcount_table_offset = cpu_to_be64(offset); |
941 | de5f3f40 | Kevin Wolf | header.refcount_table_clusters = cpu_to_be32(reftable_clusters); |
942 | de5f3f40 | Kevin Wolf | offset += (reftable_clusters * s->cluster_size); |
943 | de5f3f40 | Kevin Wolf | s->refcount_block_offset = offset; |
944 | de5f3f40 | Kevin Wolf | |
945 | de5f3f40 | Kevin Wolf | for (i=0; i < ref_clusters; i++) { |
946 | de5f3f40 | Kevin Wolf | s->refcount_table[i] = cpu_to_be64(offset); |
947 | de5f3f40 | Kevin Wolf | offset += s->cluster_size; |
948 | de5f3f40 | Kevin Wolf | } |
949 | de5f3f40 | Kevin Wolf | |
950 | de5f3f40 | Kevin Wolf | s->refcount_block = qemu_mallocz(ref_clusters * s->cluster_size); |
951 | de5f3f40 | Kevin Wolf | |
952 | de5f3f40 | Kevin Wolf | /* update refcounts */
|
953 | de5f3f40 | Kevin Wolf | qcow2_create_refcount_update(s, 0, header_size);
|
954 | de5f3f40 | Kevin Wolf | qcow2_create_refcount_update(s, s->l1_table_offset, |
955 | de5f3f40 | Kevin Wolf | l1_size * sizeof(uint64_t));
|
956 | de5f3f40 | Kevin Wolf | qcow2_create_refcount_update(s, s->refcount_table_offset, |
957 | de5f3f40 | Kevin Wolf | reftable_clusters * s->cluster_size); |
958 | de5f3f40 | Kevin Wolf | qcow2_create_refcount_update(s, s->refcount_block_offset, |
959 | de5f3f40 | Kevin Wolf | ref_clusters * s->cluster_size); |
960 | de5f3f40 | Kevin Wolf | |
961 | de5f3f40 | Kevin Wolf | /* write all the data */
|
962 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, &header, sizeof(header));
|
963 | de5f3f40 | Kevin Wolf | if (ret != sizeof(header)) { |
964 | de5f3f40 | Kevin Wolf | ret = -errno; |
965 | de5f3f40 | Kevin Wolf | goto exit;
|
966 | de5f3f40 | Kevin Wolf | } |
967 | de5f3f40 | Kevin Wolf | if (backing_file) {
|
968 | de5f3f40 | Kevin Wolf | if (backing_format_len) {
|
969 | de5f3f40 | Kevin Wolf | char zero[16]; |
970 | de5f3f40 | Kevin Wolf | int padding = rounded_ext_bf_len - (ext_bf.len + sizeof(ext_bf)); |
971 | de5f3f40 | Kevin Wolf | |
972 | de5f3f40 | Kevin Wolf | memset(zero, 0, sizeof(zero)); |
973 | de5f3f40 | Kevin Wolf | cpu_to_be32s(&ext_bf.magic); |
974 | de5f3f40 | Kevin Wolf | cpu_to_be32s(&ext_bf.len); |
975 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, &ext_bf, sizeof(ext_bf));
|
976 | de5f3f40 | Kevin Wolf | if (ret != sizeof(ext_bf)) { |
977 | de5f3f40 | Kevin Wolf | ret = -errno; |
978 | de5f3f40 | Kevin Wolf | goto exit;
|
979 | de5f3f40 | Kevin Wolf | } |
980 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, backing_format, backing_format_len); |
981 | de5f3f40 | Kevin Wolf | if (ret != backing_format_len) {
|
982 | de5f3f40 | Kevin Wolf | ret = -errno; |
983 | de5f3f40 | Kevin Wolf | goto exit;
|
984 | de5f3f40 | Kevin Wolf | } |
985 | de5f3f40 | Kevin Wolf | if (padding > 0) { |
986 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, zero, padding); |
987 | de5f3f40 | Kevin Wolf | if (ret != padding) {
|
988 | de5f3f40 | Kevin Wolf | ret = -errno; |
989 | de5f3f40 | Kevin Wolf | goto exit;
|
990 | de5f3f40 | Kevin Wolf | } |
991 | de5f3f40 | Kevin Wolf | } |
992 | de5f3f40 | Kevin Wolf | } |
993 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, backing_file, backing_filename_len); |
994 | de5f3f40 | Kevin Wolf | if (ret != backing_filename_len) {
|
995 | de5f3f40 | Kevin Wolf | ret = -errno; |
996 | de5f3f40 | Kevin Wolf | goto exit;
|
997 | de5f3f40 | Kevin Wolf | } |
998 | de5f3f40 | Kevin Wolf | } |
999 | de5f3f40 | Kevin Wolf | lseek(fd, s->l1_table_offset, SEEK_SET); |
1000 | de5f3f40 | Kevin Wolf | tmp = 0;
|
1001 | de5f3f40 | Kevin Wolf | for(i = 0;i < l1_size; i++) { |
1002 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, &tmp, sizeof(tmp));
|
1003 | de5f3f40 | Kevin Wolf | if (ret != sizeof(tmp)) { |
1004 | de5f3f40 | Kevin Wolf | ret = -errno; |
1005 | de5f3f40 | Kevin Wolf | goto exit;
|
1006 | de5f3f40 | Kevin Wolf | } |
1007 | de5f3f40 | Kevin Wolf | } |
1008 | de5f3f40 | Kevin Wolf | lseek(fd, s->refcount_table_offset, SEEK_SET); |
1009 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, s->refcount_table, |
1010 | de5f3f40 | Kevin Wolf | reftable_clusters * s->cluster_size); |
1011 | de5f3f40 | Kevin Wolf | if (ret != reftable_clusters * s->cluster_size) {
|
1012 | de5f3f40 | Kevin Wolf | ret = -errno; |
1013 | de5f3f40 | Kevin Wolf | goto exit;
|
1014 | de5f3f40 | Kevin Wolf | } |
1015 | de5f3f40 | Kevin Wolf | |
1016 | de5f3f40 | Kevin Wolf | lseek(fd, s->refcount_block_offset, SEEK_SET); |
1017 | de5f3f40 | Kevin Wolf | ret = qemu_write_full(fd, s->refcount_block, |
1018 | de5f3f40 | Kevin Wolf | ref_clusters * s->cluster_size); |
1019 | de5f3f40 | Kevin Wolf | if (ret != ref_clusters * s->cluster_size) {
|
1020 | de5f3f40 | Kevin Wolf | ret = -errno; |
1021 | de5f3f40 | Kevin Wolf | goto exit;
|
1022 | de5f3f40 | Kevin Wolf | } |
1023 | de5f3f40 | Kevin Wolf | |
1024 | de5f3f40 | Kevin Wolf | ret = 0;
|
1025 | de5f3f40 | Kevin Wolf | exit:
|
1026 | de5f3f40 | Kevin Wolf | qemu_free(s->refcount_table); |
1027 | de5f3f40 | Kevin Wolf | qemu_free(s->refcount_block); |
1028 | de5f3f40 | Kevin Wolf | close(fd); |
1029 | de5f3f40 | Kevin Wolf | |
1030 | de5f3f40 | Kevin Wolf | /* Preallocate metadata */
|
1031 | de5f3f40 | Kevin Wolf | if (ret == 0 && prealloc) { |
1032 | de5f3f40 | Kevin Wolf | BlockDriverState *bs; |
1033 | 92b30744 | Kevin Wolf | BlockDriver *drv = bdrv_find_format("qcow2");
|
1034 | de5f3f40 | Kevin Wolf | bs = bdrv_new("");
|
1035 | 92b30744 | Kevin Wolf | bdrv_open(bs, filename, BDRV_O_CACHE_WB | BDRV_O_RDWR, drv); |
1036 | 19dbcbf7 | Kevin Wolf | ret = preallocate(bs); |
1037 | de5f3f40 | Kevin Wolf | bdrv_close(bs); |
1038 | de5f3f40 | Kevin Wolf | } |
1039 | de5f3f40 | Kevin Wolf | |
1040 | de5f3f40 | Kevin Wolf | return ret;
|
1041 | de5f3f40 | Kevin Wolf | } |
1042 | de5f3f40 | Kevin Wolf | |
1043 | de5f3f40 | Kevin Wolf | static int qcow_create(const char *filename, QEMUOptionParameter *options) |
1044 | de5f3f40 | Kevin Wolf | { |
1045 | de5f3f40 | Kevin Wolf | const char *backing_file = NULL; |
1046 | de5f3f40 | Kevin Wolf | const char *backing_fmt = NULL; |
1047 | de5f3f40 | Kevin Wolf | uint64_t sectors = 0;
|
1048 | de5f3f40 | Kevin Wolf | int flags = 0; |
1049 | de5f3f40 | Kevin Wolf | size_t cluster_size = 65536;
|
1050 | de5f3f40 | Kevin Wolf | int prealloc = 0; |
1051 | de5f3f40 | Kevin Wolf | |
1052 | de5f3f40 | Kevin Wolf | /* Read out options */
|
1053 | de5f3f40 | Kevin Wolf | while (options && options->name) {
|
1054 | de5f3f40 | Kevin Wolf | if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
|
1055 | de5f3f40 | Kevin Wolf | sectors = options->value.n / 512;
|
1056 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FILE)) { |
1057 | de5f3f40 | Kevin Wolf | backing_file = options->value.s; |
1058 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_BACKING_FMT)) { |
1059 | de5f3f40 | Kevin Wolf | backing_fmt = options->value.s; |
1060 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_ENCRYPT)) { |
1061 | de5f3f40 | Kevin Wolf | flags |= options->value.n ? BLOCK_FLAG_ENCRYPT : 0;
|
1062 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_CLUSTER_SIZE)) { |
1063 | de5f3f40 | Kevin Wolf | if (options->value.n) {
|
1064 | de5f3f40 | Kevin Wolf | cluster_size = options->value.n; |
1065 | de5f3f40 | Kevin Wolf | } |
1066 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->name, BLOCK_OPT_PREALLOC)) { |
1067 | de5f3f40 | Kevin Wolf | if (!options->value.s || !strcmp(options->value.s, "off")) { |
1068 | de5f3f40 | Kevin Wolf | prealloc = 0;
|
1069 | de5f3f40 | Kevin Wolf | } else if (!strcmp(options->value.s, "metadata")) { |
1070 | de5f3f40 | Kevin Wolf | prealloc = 1;
|
1071 | de5f3f40 | Kevin Wolf | } else {
|
1072 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Invalid preallocation mode: '%s'\n",
|
1073 | de5f3f40 | Kevin Wolf | options->value.s); |
1074 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1075 | de5f3f40 | Kevin Wolf | } |
1076 | de5f3f40 | Kevin Wolf | } |
1077 | de5f3f40 | Kevin Wolf | options++; |
1078 | de5f3f40 | Kevin Wolf | } |
1079 | de5f3f40 | Kevin Wolf | |
1080 | de5f3f40 | Kevin Wolf | if (backing_file && prealloc) {
|
1081 | de5f3f40 | Kevin Wolf | fprintf(stderr, "Backing file and preallocation cannot be used at "
|
1082 | de5f3f40 | Kevin Wolf | "the same time\n");
|
1083 | de5f3f40 | Kevin Wolf | return -EINVAL;
|
1084 | de5f3f40 | Kevin Wolf | } |
1085 | de5f3f40 | Kevin Wolf | |
1086 | de5f3f40 | Kevin Wolf | return qcow_create2(filename, sectors, backing_file, backing_fmt, flags,
|
1087 | de5f3f40 | Kevin Wolf | cluster_size, prealloc); |
1088 | de5f3f40 | Kevin Wolf | } |
1089 | de5f3f40 | Kevin Wolf | |
1090 | 20d97356 | Blue Swirl | static int qcow_make_empty(BlockDriverState *bs) |
1091 | 20d97356 | Blue Swirl | { |
1092 | 20d97356 | Blue Swirl | #if 0
|
1093 | 20d97356 | Blue Swirl | /* XXX: not correct */
|
1094 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1095 | 20d97356 | Blue Swirl | uint32_t l1_length = s->l1_size * sizeof(uint64_t);
|
1096 | 20d97356 | Blue Swirl | int ret;
|
1097 | 20d97356 | Blue Swirl | |
1098 | 20d97356 | Blue Swirl | memset(s->l1_table, 0, l1_length);
|
1099 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, s->l1_table_offset, s->l1_table, l1_length) < 0)
|
1100 | 20d97356 | Blue Swirl | return -1;
|
1101 | 66f82cee | Kevin Wolf | ret = bdrv_truncate(bs->file, s->l1_table_offset + l1_length);
|
1102 | 20d97356 | Blue Swirl | if (ret < 0)
|
1103 | 20d97356 | Blue Swirl | return ret;
|
1104 | 20d97356 | Blue Swirl | |
1105 | 20d97356 | Blue Swirl | l2_cache_reset(bs);
|
1106 | 20d97356 | Blue Swirl | #endif
|
1107 | 20d97356 | Blue Swirl | return 0; |
1108 | 20d97356 | Blue Swirl | } |
1109 | 20d97356 | Blue Swirl | |
1110 | 419b19d9 | Stefan Hajnoczi | static int qcow2_truncate(BlockDriverState *bs, int64_t offset) |
1111 | 419b19d9 | Stefan Hajnoczi | { |
1112 | 419b19d9 | Stefan Hajnoczi | BDRVQcowState *s = bs->opaque; |
1113 | 419b19d9 | Stefan Hajnoczi | int ret, new_l1_size;
|
1114 | 419b19d9 | Stefan Hajnoczi | |
1115 | 419b19d9 | Stefan Hajnoczi | if (offset & 511) { |
1116 | 419b19d9 | Stefan Hajnoczi | return -EINVAL;
|
1117 | 419b19d9 | Stefan Hajnoczi | } |
1118 | 419b19d9 | Stefan Hajnoczi | |
1119 | 419b19d9 | Stefan Hajnoczi | /* cannot proceed if image has snapshots */
|
1120 | 419b19d9 | Stefan Hajnoczi | if (s->nb_snapshots) {
|
1121 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1122 | 419b19d9 | Stefan Hajnoczi | } |
1123 | 419b19d9 | Stefan Hajnoczi | |
1124 | 419b19d9 | Stefan Hajnoczi | /* shrinking is currently not supported */
|
1125 | 419b19d9 | Stefan Hajnoczi | if (offset < bs->total_sectors * 512) { |
1126 | 419b19d9 | Stefan Hajnoczi | return -ENOTSUP;
|
1127 | 419b19d9 | Stefan Hajnoczi | } |
1128 | 419b19d9 | Stefan Hajnoczi | |
1129 | 419b19d9 | Stefan Hajnoczi | new_l1_size = size_to_l1(s, offset); |
1130 | 419b19d9 | Stefan Hajnoczi | ret = qcow2_grow_l1_table(bs, new_l1_size); |
1131 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1132 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1133 | 419b19d9 | Stefan Hajnoczi | } |
1134 | 419b19d9 | Stefan Hajnoczi | |
1135 | 419b19d9 | Stefan Hajnoczi | /* write updated header.size */
|
1136 | 419b19d9 | Stefan Hajnoczi | offset = cpu_to_be64(offset); |
1137 | 8b3b7206 | Kevin Wolf | ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size), |
1138 | 8b3b7206 | Kevin Wolf | &offset, sizeof(uint64_t));
|
1139 | 419b19d9 | Stefan Hajnoczi | if (ret < 0) { |
1140 | 419b19d9 | Stefan Hajnoczi | return ret;
|
1141 | 419b19d9 | Stefan Hajnoczi | } |
1142 | 419b19d9 | Stefan Hajnoczi | |
1143 | 419b19d9 | Stefan Hajnoczi | s->l1_vm_state_index = new_l1_size; |
1144 | 419b19d9 | Stefan Hajnoczi | return 0; |
1145 | 419b19d9 | Stefan Hajnoczi | } |
1146 | 419b19d9 | Stefan Hajnoczi | |
1147 | 20d97356 | Blue Swirl | /* XXX: put compressed sectors first, then all the cluster aligned
|
1148 | 20d97356 | Blue Swirl | tables to avoid losing bytes in alignment */
|
1149 | 20d97356 | Blue Swirl | static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num, |
1150 | 20d97356 | Blue Swirl | const uint8_t *buf, int nb_sectors) |
1151 | 20d97356 | Blue Swirl | { |
1152 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1153 | 20d97356 | Blue Swirl | z_stream strm; |
1154 | 20d97356 | Blue Swirl | int ret, out_len;
|
1155 | 20d97356 | Blue Swirl | uint8_t *out_buf; |
1156 | 20d97356 | Blue Swirl | uint64_t cluster_offset; |
1157 | 20d97356 | Blue Swirl | |
1158 | 20d97356 | Blue Swirl | if (nb_sectors == 0) { |
1159 | 20d97356 | Blue Swirl | /* align end of file to a sector boundary to ease reading with
|
1160 | 20d97356 | Blue Swirl | sector based I/Os */
|
1161 | 66f82cee | Kevin Wolf | cluster_offset = bdrv_getlength(bs->file); |
1162 | 20d97356 | Blue Swirl | cluster_offset = (cluster_offset + 511) & ~511; |
1163 | 66f82cee | Kevin Wolf | bdrv_truncate(bs->file, cluster_offset); |
1164 | 20d97356 | Blue Swirl | return 0; |
1165 | 20d97356 | Blue Swirl | } |
1166 | 20d97356 | Blue Swirl | |
1167 | 20d97356 | Blue Swirl | if (nb_sectors != s->cluster_sectors)
|
1168 | 20d97356 | Blue Swirl | return -EINVAL;
|
1169 | 20d97356 | Blue Swirl | |
1170 | 20d97356 | Blue Swirl | out_buf = qemu_malloc(s->cluster_size + (s->cluster_size / 1000) + 128); |
1171 | 20d97356 | Blue Swirl | |
1172 | 20d97356 | Blue Swirl | /* best compression, small window, no zlib header */
|
1173 | 20d97356 | Blue Swirl | memset(&strm, 0, sizeof(strm)); |
1174 | 20d97356 | Blue Swirl | ret = deflateInit2(&strm, Z_DEFAULT_COMPRESSION, |
1175 | 20d97356 | Blue Swirl | Z_DEFLATED, -12,
|
1176 | 20d97356 | Blue Swirl | 9, Z_DEFAULT_STRATEGY);
|
1177 | 20d97356 | Blue Swirl | if (ret != 0) { |
1178 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1179 | 20d97356 | Blue Swirl | return -1; |
1180 | 20d97356 | Blue Swirl | } |
1181 | 20d97356 | Blue Swirl | |
1182 | 20d97356 | Blue Swirl | strm.avail_in = s->cluster_size; |
1183 | 20d97356 | Blue Swirl | strm.next_in = (uint8_t *)buf; |
1184 | 20d97356 | Blue Swirl | strm.avail_out = s->cluster_size; |
1185 | 20d97356 | Blue Swirl | strm.next_out = out_buf; |
1186 | 20d97356 | Blue Swirl | |
1187 | 20d97356 | Blue Swirl | ret = deflate(&strm, Z_FINISH); |
1188 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END && ret != Z_OK) {
|
1189 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1190 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1191 | 20d97356 | Blue Swirl | return -1; |
1192 | 20d97356 | Blue Swirl | } |
1193 | 20d97356 | Blue Swirl | out_len = strm.next_out - out_buf; |
1194 | 20d97356 | Blue Swirl | |
1195 | 20d97356 | Blue Swirl | deflateEnd(&strm); |
1196 | 20d97356 | Blue Swirl | |
1197 | 20d97356 | Blue Swirl | if (ret != Z_STREAM_END || out_len >= s->cluster_size) {
|
1198 | 20d97356 | Blue Swirl | /* could not compress: write normal cluster */
|
1199 | 20d97356 | Blue Swirl | bdrv_write(bs, sector_num, buf, s->cluster_sectors); |
1200 | 20d97356 | Blue Swirl | } else {
|
1201 | 20d97356 | Blue Swirl | cluster_offset = qcow2_alloc_compressed_cluster_offset(bs, |
1202 | 20d97356 | Blue Swirl | sector_num << 9, out_len);
|
1203 | 20d97356 | Blue Swirl | if (!cluster_offset)
|
1204 | 20d97356 | Blue Swirl | return -1; |
1205 | 20d97356 | Blue Swirl | cluster_offset &= s->cluster_offset_mask; |
1206 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_WRITE_COMPRESSED); |
1207 | 66f82cee | Kevin Wolf | if (bdrv_pwrite(bs->file, cluster_offset, out_buf, out_len) != out_len) {
|
1208 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1209 | 20d97356 | Blue Swirl | return -1; |
1210 | 20d97356 | Blue Swirl | } |
1211 | 20d97356 | Blue Swirl | } |
1212 | 20d97356 | Blue Swirl | |
1213 | 20d97356 | Blue Swirl | qemu_free(out_buf); |
1214 | 20d97356 | Blue Swirl | return 0; |
1215 | 20d97356 | Blue Swirl | } |
1216 | 20d97356 | Blue Swirl | |
1217 | 20d97356 | Blue Swirl | static void qcow_flush(BlockDriverState *bs) |
1218 | 20d97356 | Blue Swirl | { |
1219 | 66f82cee | Kevin Wolf | bdrv_flush(bs->file); |
1220 | 20d97356 | Blue Swirl | } |
1221 | 20d97356 | Blue Swirl | |
1222 | 20d97356 | Blue Swirl | static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
|
1223 | 20d97356 | Blue Swirl | BlockDriverCompletionFunc *cb, void *opaque)
|
1224 | 20d97356 | Blue Swirl | { |
1225 | 66f82cee | Kevin Wolf | return bdrv_aio_flush(bs->file, cb, opaque);
|
1226 | 20d97356 | Blue Swirl | } |
1227 | 20d97356 | Blue Swirl | |
1228 | 20d97356 | Blue Swirl | static int64_t qcow_vm_state_offset(BDRVQcowState *s)
|
1229 | 20d97356 | Blue Swirl | { |
1230 | 20d97356 | Blue Swirl | return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
|
1231 | 20d97356 | Blue Swirl | } |
1232 | 20d97356 | Blue Swirl | |
1233 | 20d97356 | Blue Swirl | static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi) |
1234 | 20d97356 | Blue Swirl | { |
1235 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1236 | 20d97356 | Blue Swirl | bdi->cluster_size = s->cluster_size; |
1237 | 20d97356 | Blue Swirl | bdi->vm_state_offset = qcow_vm_state_offset(s); |
1238 | 20d97356 | Blue Swirl | return 0; |
1239 | 20d97356 | Blue Swirl | } |
1240 | 20d97356 | Blue Swirl | |
1241 | 20d97356 | Blue Swirl | |
1242 | 9ac228e0 | Kevin Wolf | static int qcow_check(BlockDriverState *bs, BdrvCheckResult *result) |
1243 | 20d97356 | Blue Swirl | { |
1244 | 9ac228e0 | Kevin Wolf | return qcow2_check_refcounts(bs, result);
|
1245 | 20d97356 | Blue Swirl | } |
1246 | 20d97356 | Blue Swirl | |
1247 | 20d97356 | Blue Swirl | #if 0
|
1248 | 20d97356 | Blue Swirl | static void dump_refcounts(BlockDriverState *bs)
|
1249 | 20d97356 | Blue Swirl | {
|
1250 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque;
|
1251 | 20d97356 | Blue Swirl | int64_t nb_clusters, k, k1, size;
|
1252 | 20d97356 | Blue Swirl | int refcount;
|
1253 | 20d97356 | Blue Swirl | |
1254 | 66f82cee | Kevin Wolf | size = bdrv_getlength(bs->file);
|
1255 | 20d97356 | Blue Swirl | nb_clusters = size_to_clusters(s, size);
|
1256 | 20d97356 | Blue Swirl | for(k = 0; k < nb_clusters;) {
|
1257 | 20d97356 | Blue Swirl | k1 = k;
|
1258 | 20d97356 | Blue Swirl | refcount = get_refcount(bs, k);
|
1259 | 20d97356 | Blue Swirl | k++;
|
1260 | 20d97356 | Blue Swirl | while (k < nb_clusters && get_refcount(bs, k) == refcount)
|
1261 | 20d97356 | Blue Swirl | k++;
|
1262 | 0bfcd599 | Blue Swirl | printf("%" PRId64 ": refcount=%d nb=%" PRId64 "\n", k, refcount,
|
1263 | 0bfcd599 | Blue Swirl | k - k1);
|
1264 | 20d97356 | Blue Swirl | }
|
1265 | 20d97356 | Blue Swirl | }
|
1266 | 20d97356 | Blue Swirl | #endif
|
1267 | 20d97356 | Blue Swirl | |
1268 | 20d97356 | Blue Swirl | static int qcow_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1269 | 20d97356 | Blue Swirl | int64_t pos, int size)
|
1270 | 20d97356 | Blue Swirl | { |
1271 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1272 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1273 | 20d97356 | Blue Swirl | int ret;
|
1274 | 20d97356 | Blue Swirl | |
1275 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_SAVE); |
1276 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1277 | 20d97356 | Blue Swirl | ret = bdrv_pwrite(bs, qcow_vm_state_offset(s) + pos, buf, size); |
1278 | 20d97356 | Blue Swirl | bs->growable = growable; |
1279 | 20d97356 | Blue Swirl | |
1280 | 20d97356 | Blue Swirl | return ret;
|
1281 | 20d97356 | Blue Swirl | } |
1282 | 20d97356 | Blue Swirl | |
1283 | 20d97356 | Blue Swirl | static int qcow_load_vmstate(BlockDriverState *bs, uint8_t *buf, |
1284 | 20d97356 | Blue Swirl | int64_t pos, int size)
|
1285 | 20d97356 | Blue Swirl | { |
1286 | 20d97356 | Blue Swirl | BDRVQcowState *s = bs->opaque; |
1287 | 20d97356 | Blue Swirl | int growable = bs->growable;
|
1288 | 20d97356 | Blue Swirl | int ret;
|
1289 | 20d97356 | Blue Swirl | |
1290 | 66f82cee | Kevin Wolf | BLKDBG_EVENT(bs->file, BLKDBG_VMSTATE_LOAD); |
1291 | 20d97356 | Blue Swirl | bs->growable = 1;
|
1292 | 20d97356 | Blue Swirl | ret = bdrv_pread(bs, qcow_vm_state_offset(s) + pos, buf, size); |
1293 | 20d97356 | Blue Swirl | bs->growable = growable; |
1294 | 20d97356 | Blue Swirl | |
1295 | 20d97356 | Blue Swirl | return ret;
|
1296 | 20d97356 | Blue Swirl | } |
1297 | 20d97356 | Blue Swirl | |
1298 | 20d97356 | Blue Swirl | static QEMUOptionParameter qcow_create_options[] = {
|
1299 | 20d97356 | Blue Swirl | { |
1300 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_SIZE, |
1301 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
1302 | 20d97356 | Blue Swirl | .help = "Virtual disk size"
|
1303 | 20d97356 | Blue Swirl | }, |
1304 | 20d97356 | Blue Swirl | { |
1305 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FILE, |
1306 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1307 | 20d97356 | Blue Swirl | .help = "File name of a base image"
|
1308 | 20d97356 | Blue Swirl | }, |
1309 | 20d97356 | Blue Swirl | { |
1310 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_BACKING_FMT, |
1311 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1312 | 20d97356 | Blue Swirl | .help = "Image format of the base image"
|
1313 | 20d97356 | Blue Swirl | }, |
1314 | 20d97356 | Blue Swirl | { |
1315 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_ENCRYPT, |
1316 | 20d97356 | Blue Swirl | .type = OPT_FLAG, |
1317 | 20d97356 | Blue Swirl | .help = "Encrypt the image"
|
1318 | 20d97356 | Blue Swirl | }, |
1319 | 20d97356 | Blue Swirl | { |
1320 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_CLUSTER_SIZE, |
1321 | 20d97356 | Blue Swirl | .type = OPT_SIZE, |
1322 | 20d97356 | Blue Swirl | .help = "qcow2 cluster size"
|
1323 | 20d97356 | Blue Swirl | }, |
1324 | 20d97356 | Blue Swirl | { |
1325 | 20d97356 | Blue Swirl | .name = BLOCK_OPT_PREALLOC, |
1326 | 20d97356 | Blue Swirl | .type = OPT_STRING, |
1327 | 20d97356 | Blue Swirl | .help = "Preallocation mode (allowed values: off, metadata)"
|
1328 | 20d97356 | Blue Swirl | }, |
1329 | 20d97356 | Blue Swirl | { NULL }
|
1330 | 20d97356 | Blue Swirl | }; |
1331 | 20d97356 | Blue Swirl | |
1332 | 20d97356 | Blue Swirl | static BlockDriver bdrv_qcow2 = {
|
1333 | 20d97356 | Blue Swirl | .format_name = "qcow2",
|
1334 | 20d97356 | Blue Swirl | .instance_size = sizeof(BDRVQcowState),
|
1335 | 20d97356 | Blue Swirl | .bdrv_probe = qcow_probe, |
1336 | 20d97356 | Blue Swirl | .bdrv_open = qcow_open, |
1337 | 20d97356 | Blue Swirl | .bdrv_close = qcow_close, |
1338 | 20d97356 | Blue Swirl | .bdrv_create = qcow_create, |
1339 | 20d97356 | Blue Swirl | .bdrv_flush = qcow_flush, |
1340 | 20d97356 | Blue Swirl | .bdrv_is_allocated = qcow_is_allocated, |
1341 | 20d97356 | Blue Swirl | .bdrv_set_key = qcow_set_key, |
1342 | 20d97356 | Blue Swirl | .bdrv_make_empty = qcow_make_empty, |
1343 | 20d97356 | Blue Swirl | |
1344 | 20d97356 | Blue Swirl | .bdrv_aio_readv = qcow_aio_readv, |
1345 | 20d97356 | Blue Swirl | .bdrv_aio_writev = qcow_aio_writev, |
1346 | 20d97356 | Blue Swirl | .bdrv_aio_flush = qcow_aio_flush, |
1347 | 419b19d9 | Stefan Hajnoczi | |
1348 | 419b19d9 | Stefan Hajnoczi | .bdrv_truncate = qcow2_truncate, |
1349 | 419b19d9 | Stefan Hajnoczi | .bdrv_write_compressed = qcow_write_compressed, |
1350 | 20d97356 | Blue Swirl | |
1351 | 20d97356 | Blue Swirl | .bdrv_snapshot_create = qcow2_snapshot_create, |
1352 | 20d97356 | Blue Swirl | .bdrv_snapshot_goto = qcow2_snapshot_goto, |
1353 | 20d97356 | Blue Swirl | .bdrv_snapshot_delete = qcow2_snapshot_delete, |
1354 | 20d97356 | Blue Swirl | .bdrv_snapshot_list = qcow2_snapshot_list, |
1355 | 20d97356 | Blue Swirl | .bdrv_get_info = qcow_get_info, |
1356 | 20d97356 | Blue Swirl | |
1357 | 20d97356 | Blue Swirl | .bdrv_save_vmstate = qcow_save_vmstate, |
1358 | 20d97356 | Blue Swirl | .bdrv_load_vmstate = qcow_load_vmstate, |
1359 | 20d97356 | Blue Swirl | |
1360 | 20d97356 | Blue Swirl | .bdrv_change_backing_file = qcow2_change_backing_file, |
1361 | 20d97356 | Blue Swirl | |
1362 | 20d97356 | Blue Swirl | .create_options = qcow_create_options, |
1363 | 20d97356 | Blue Swirl | .bdrv_check = qcow_check, |
1364 | 20d97356 | Blue Swirl | }; |
1365 | 20d97356 | Blue Swirl | |
1366 | 5efa9d5a | Anthony Liguori | static void bdrv_qcow2_init(void) |
1367 | 5efa9d5a | Anthony Liguori | { |
1368 | 5efa9d5a | Anthony Liguori | bdrv_register(&bdrv_qcow2); |
1369 | 5efa9d5a | Anthony Liguori | } |
1370 | 5efa9d5a | Anthony Liguori | |
1371 | 5efa9d5a | Anthony Liguori | block_init(bdrv_qcow2_init); |