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1.1 root 1: /*
2: * Block driver for the QCOW version 2 format
3: *
4: * Copyright (c) 2004-2006 Fabrice Bellard
5: *
6: * Permission is hereby granted, free of charge, to any person obtaining a copy
7: * of this software and associated documentation files (the "Software"), to deal
8: * in the Software without restriction, including without limitation the rights
9: * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10: * copies of the Software, and to permit persons to whom the Software is
11: * furnished to do so, subject to the following conditions:
12: *
13: * The above copyright notice and this permission notice shall be included in
14: * all copies or substantial portions of the Software.
15: *
16: * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17: * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19: * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20: * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21: * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22: * THE SOFTWARE.
23: */
24:
25: #ifndef BLOCK_QCOW2_H
26: #define BLOCK_QCOW2_H
27:
28: #include "aes.h"
29:
30: //#define DEBUG_ALLOC
31: //#define DEBUG_ALLOC2
32: //#define DEBUG_EXT
33:
34: #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
35: #define QCOW_VERSION 2
36:
37: #define QCOW_CRYPT_NONE 0
38: #define QCOW_CRYPT_AES 1
39:
40: #define QCOW_MAX_CRYPT_CLUSTERS 32
41:
42: /* indicate that the refcount of the referenced cluster is exactly one. */
43: #define QCOW_OFLAG_COPIED (1LL << 63)
44: /* indicate that the cluster is compressed (they never have the copied flag) */
45: #define QCOW_OFLAG_COMPRESSED (1LL << 62)
46:
47: #define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */
48:
49: #define MIN_CLUSTER_BITS 9
1.1.1.2 ! root 50: #define MAX_CLUSTER_BITS 21
1.1 root 51:
52: #define L2_CACHE_SIZE 16
53:
54: typedef struct QCowHeader {
55: uint32_t magic;
56: uint32_t version;
57: uint64_t backing_file_offset;
58: uint32_t backing_file_size;
59: uint32_t cluster_bits;
60: uint64_t size; /* in bytes */
61: uint32_t crypt_method;
62: uint32_t l1_size; /* XXX: save number of clusters instead ? */
63: uint64_t l1_table_offset;
64: uint64_t refcount_table_offset;
65: uint32_t refcount_table_clusters;
66: uint32_t nb_snapshots;
67: uint64_t snapshots_offset;
68: } QCowHeader;
69:
70: typedef struct QCowSnapshot {
71: uint64_t l1_table_offset;
72: uint32_t l1_size;
73: char *id_str;
74: char *name;
75: uint32_t vm_state_size;
76: uint32_t date_sec;
77: uint32_t date_nsec;
78: uint64_t vm_clock_nsec;
79: } QCowSnapshot;
80:
81: typedef struct BDRVQcowState {
82: BlockDriverState *hd;
83: int cluster_bits;
84: int cluster_size;
85: int cluster_sectors;
86: int l2_bits;
87: int l2_size;
88: int l1_size;
89: int l1_vm_state_index;
90: int csize_shift;
91: int csize_mask;
92: uint64_t cluster_offset_mask;
93: uint64_t l1_table_offset;
94: uint64_t *l1_table;
95: uint64_t *l2_cache;
96: uint64_t l2_cache_offsets[L2_CACHE_SIZE];
97: uint32_t l2_cache_counts[L2_CACHE_SIZE];
98: uint8_t *cluster_cache;
99: uint8_t *cluster_data;
100: uint64_t cluster_cache_offset;
1.1.1.2 ! root 101: QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs;
1.1 root 102:
103: uint64_t *refcount_table;
104: uint64_t refcount_table_offset;
105: uint32_t refcount_table_size;
106: uint64_t refcount_block_cache_offset;
107: uint16_t *refcount_block_cache;
108: int64_t free_cluster_index;
109: int64_t free_byte_offset;
110:
111: uint32_t crypt_method; /* current crypt method, 0 if no key yet */
112: uint32_t crypt_method_header;
113: AES_KEY aes_encrypt_key;
114: AES_KEY aes_decrypt_key;
115: uint64_t snapshots_offset;
116: int snapshots_size;
117: int nb_snapshots;
118: QCowSnapshot *snapshots;
119: } BDRVQcowState;
120:
121: /* XXX: use std qcow open function ? */
122: typedef struct QCowCreateState {
123: int cluster_size;
124: int cluster_bits;
125: uint16_t *refcount_block;
126: uint64_t *refcount_table;
127: int64_t l1_table_offset;
128: int64_t refcount_table_offset;
129: int64_t refcount_block_offset;
130: } QCowCreateState;
131:
132: struct QCowAIOCB;
133:
134: /* XXX This could be private for qcow2-cluster.c */
135: typedef struct QCowL2Meta
136: {
137: uint64_t offset;
138: int n_start;
139: int nb_available;
140: int nb_clusters;
141: struct QCowL2Meta *depends_on;
1.1.1.2 ! root 142: QLIST_HEAD(QCowAioDependencies, QCowAIOCB) dependent_requests;
1.1 root 143:
1.1.1.2 ! root 144: QLIST_ENTRY(QCowL2Meta) next_in_flight;
1.1 root 145: } QCowL2Meta;
146:
147: static inline int size_to_clusters(BDRVQcowState *s, int64_t size)
148: {
149: return (size + (s->cluster_size - 1)) >> s->cluster_bits;
150: }
151:
152: static inline int64_t align_offset(int64_t offset, int n)
153: {
154: offset = (offset + n - 1) & ~(n - 1);
155: return offset;
156: }
157:
158:
159: // FIXME Need qcow2_ prefix to global functions
160:
161: /* qcow2.c functions */
162: int qcow2_backing_read1(BlockDriverState *bs,
163: int64_t sector_num, uint8_t *buf, int nb_sectors);
164:
165: /* qcow2-refcount.c functions */
166: int qcow2_refcount_init(BlockDriverState *bs);
167: void qcow2_refcount_close(BlockDriverState *bs);
168:
169: int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size);
170: int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
171: void qcow2_free_clusters(BlockDriverState *bs,
172: int64_t offset, int64_t size);
173: void qcow2_free_any_clusters(BlockDriverState *bs,
174: uint64_t cluster_offset, int nb_clusters);
175:
176: void qcow2_create_refcount_update(QCowCreateState *s, int64_t offset,
177: int64_t size);
178: int qcow2_update_snapshot_refcount(BlockDriverState *bs,
179: int64_t l1_table_offset, int l1_size, int addend);
180:
181: int qcow2_check_refcounts(BlockDriverState *bs);
182:
183: /* qcow2-cluster.c functions */
184: int qcow2_grow_l1_table(BlockDriverState *bs, int min_size);
185: void qcow2_l2_cache_reset(BlockDriverState *bs);
186: int qcow2_decompress_cluster(BDRVQcowState *s, uint64_t cluster_offset);
187: void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
188: uint8_t *out_buf, const uint8_t *in_buf,
189: int nb_sectors, int enc,
190: const AES_KEY *key);
191:
192: uint64_t qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
193: int *num);
194: uint64_t qcow2_alloc_cluster_offset(BlockDriverState *bs,
195: uint64_t offset,
196: int n_start, int n_end,
197: int *num, QCowL2Meta *m);
198: uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
199: uint64_t offset,
200: int compressed_size);
201:
202: int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, uint64_t cluster_offset,
203: QCowL2Meta *m);
204:
205: /* qcow2-snapshot.c functions */
206: int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
207: int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
208: int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
209: int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
210:
211: void qcow2_free_snapshots(BlockDriverState *bs);
212: int qcow2_read_snapshots(BlockDriverState *bs);
213:
214: #endif
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