root / block / qcow2.h @ f53ec699
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1 | f7d0fe02 | Kevin Wolf | /*
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2 | f7d0fe02 | Kevin Wolf | * Block driver for the QCOW version 2 format
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3 | f7d0fe02 | Kevin Wolf | *
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4 | f7d0fe02 | Kevin Wolf | * Copyright (c) 2004-2006 Fabrice Bellard
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5 | f7d0fe02 | Kevin Wolf | *
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6 | f7d0fe02 | Kevin Wolf | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | f7d0fe02 | Kevin Wolf | * of this software and associated documentation files (the "Software"), to deal
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8 | f7d0fe02 | Kevin Wolf | * in the Software without restriction, including without limitation the rights
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9 | f7d0fe02 | Kevin Wolf | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | f7d0fe02 | Kevin Wolf | * copies of the Software, and to permit persons to whom the Software is
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11 | f7d0fe02 | Kevin Wolf | * furnished to do so, subject to the following conditions:
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12 | f7d0fe02 | Kevin Wolf | *
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13 | f7d0fe02 | Kevin Wolf | * The above copyright notice and this permission notice shall be included in
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14 | f7d0fe02 | Kevin Wolf | * all copies or substantial portions of the Software.
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15 | f7d0fe02 | Kevin Wolf | *
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16 | f7d0fe02 | Kevin Wolf | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | f7d0fe02 | Kevin Wolf | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | f7d0fe02 | Kevin Wolf | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | f7d0fe02 | Kevin Wolf | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | f7d0fe02 | Kevin Wolf | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | f7d0fe02 | Kevin Wolf | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | f7d0fe02 | Kevin Wolf | * THE SOFTWARE.
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23 | f7d0fe02 | Kevin Wolf | */
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24 | f7d0fe02 | Kevin Wolf | |
25 | f7d0fe02 | Kevin Wolf | #ifndef BLOCK_QCOW2_H
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26 | f7d0fe02 | Kevin Wolf | #define BLOCK_QCOW2_H
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27 | f7d0fe02 | Kevin Wolf | |
28 | 753d9b82 | Aurelien Jarno | #include "qemu/aes.h" |
29 | 737e150e | Paolo Bonzini | #include "block/coroutine.h" |
30 | f7d0fe02 | Kevin Wolf | |
31 | 14899cdf | Filip Navara | //#define DEBUG_ALLOC
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32 | 14899cdf | Filip Navara | //#define DEBUG_ALLOC2
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33 | 14899cdf | Filip Navara | //#define DEBUG_EXT
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34 | 14899cdf | Filip Navara | |
35 | f7d0fe02 | Kevin Wolf | #define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb) |
36 | f7d0fe02 | Kevin Wolf | |
37 | f7d0fe02 | Kevin Wolf | #define QCOW_CRYPT_NONE 0 |
38 | f7d0fe02 | Kevin Wolf | #define QCOW_CRYPT_AES 1 |
39 | f7d0fe02 | Kevin Wolf | |
40 | f7d0fe02 | Kevin Wolf | #define QCOW_MAX_CRYPT_CLUSTERS 32 |
41 | f7d0fe02 | Kevin Wolf | |
42 | f7d0fe02 | Kevin Wolf | /* indicate that the refcount of the referenced cluster is exactly one. */
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43 | f7d0fe02 | Kevin Wolf | #define QCOW_OFLAG_COPIED (1LL << 63) |
44 | f7d0fe02 | Kevin Wolf | /* indicate that the cluster is compressed (they never have the copied flag) */
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45 | f7d0fe02 | Kevin Wolf | #define QCOW_OFLAG_COMPRESSED (1LL << 62) |
46 | 6377af48 | Kevin Wolf | /* The cluster reads as all zeros */
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47 | 6377af48 | Kevin Wolf | #define QCOW_OFLAG_ZERO (1LL << 0) |
48 | f7d0fe02 | Kevin Wolf | |
49 | f7d0fe02 | Kevin Wolf | #define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */ |
50 | f7d0fe02 | Kevin Wolf | |
51 | f7d0fe02 | Kevin Wolf | #define MIN_CLUSTER_BITS 9 |
52 | 80ee15a6 | Kevin Wolf | #define MAX_CLUSTER_BITS 21 |
53 | f7d0fe02 | Kevin Wolf | |
54 | f7d0fe02 | Kevin Wolf | #define L2_CACHE_SIZE 16 |
55 | f7d0fe02 | Kevin Wolf | |
56 | 29c1a730 | Kevin Wolf | /* Must be at least 4 to cover all cases of refcount table growth */
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57 | 29c1a730 | Kevin Wolf | #define REFCOUNT_CACHE_SIZE 4 |
58 | 29c1a730 | Kevin Wolf | |
59 | 99cce9fa | Kevin Wolf | #define DEFAULT_CLUSTER_SIZE 65536 |
60 | 99cce9fa | Kevin Wolf | |
61 | acdfb480 | Kevin Wolf | |
62 | 64aa99d3 | Kevin Wolf | #define QCOW2_OPT_LAZY_REFCOUNTS "lazy-refcounts" |
63 | 64aa99d3 | Kevin Wolf | #define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request" |
64 | 64aa99d3 | Kevin Wolf | #define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot" |
65 | 64aa99d3 | Kevin Wolf | #define QCOW2_OPT_DISCARD_OTHER "pass-discard-other" |
66 | acdfb480 | Kevin Wolf | |
67 | f7d0fe02 | Kevin Wolf | typedef struct QCowHeader { |
68 | f7d0fe02 | Kevin Wolf | uint32_t magic; |
69 | f7d0fe02 | Kevin Wolf | uint32_t version; |
70 | f7d0fe02 | Kevin Wolf | uint64_t backing_file_offset; |
71 | f7d0fe02 | Kevin Wolf | uint32_t backing_file_size; |
72 | f7d0fe02 | Kevin Wolf | uint32_t cluster_bits; |
73 | f7d0fe02 | Kevin Wolf | uint64_t size; /* in bytes */
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74 | f7d0fe02 | Kevin Wolf | uint32_t crypt_method; |
75 | f7d0fe02 | Kevin Wolf | uint32_t l1_size; /* XXX: save number of clusters instead ? */
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76 | f7d0fe02 | Kevin Wolf | uint64_t l1_table_offset; |
77 | f7d0fe02 | Kevin Wolf | uint64_t refcount_table_offset; |
78 | f7d0fe02 | Kevin Wolf | uint32_t refcount_table_clusters; |
79 | f7d0fe02 | Kevin Wolf | uint32_t nb_snapshots; |
80 | f7d0fe02 | Kevin Wolf | uint64_t snapshots_offset; |
81 | 6744cbab | Kevin Wolf | |
82 | 6744cbab | Kevin Wolf | /* The following fields are only valid for version >= 3 */
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83 | 6744cbab | Kevin Wolf | uint64_t incompatible_features; |
84 | 6744cbab | Kevin Wolf | uint64_t compatible_features; |
85 | 6744cbab | Kevin Wolf | uint64_t autoclear_features; |
86 | 6744cbab | Kevin Wolf | |
87 | 6744cbab | Kevin Wolf | uint32_t refcount_order; |
88 | 6744cbab | Kevin Wolf | uint32_t header_length; |
89 | f7d0fe02 | Kevin Wolf | } QCowHeader; |
90 | f7d0fe02 | Kevin Wolf | |
91 | f7d0fe02 | Kevin Wolf | typedef struct QCowSnapshot { |
92 | f7d0fe02 | Kevin Wolf | uint64_t l1_table_offset; |
93 | f7d0fe02 | Kevin Wolf | uint32_t l1_size; |
94 | f7d0fe02 | Kevin Wolf | char *id_str;
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95 | f7d0fe02 | Kevin Wolf | char *name;
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96 | 90b27759 | Kevin Wolf | uint64_t disk_size; |
97 | c2c9a466 | Kevin Wolf | uint64_t vm_state_size; |
98 | f7d0fe02 | Kevin Wolf | uint32_t date_sec; |
99 | f7d0fe02 | Kevin Wolf | uint32_t date_nsec; |
100 | f7d0fe02 | Kevin Wolf | uint64_t vm_clock_nsec; |
101 | f7d0fe02 | Kevin Wolf | } QCowSnapshot; |
102 | f7d0fe02 | Kevin Wolf | |
103 | 49381094 | Kevin Wolf | struct Qcow2Cache;
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104 | 49381094 | Kevin Wolf | typedef struct Qcow2Cache Qcow2Cache; |
105 | 49381094 | Kevin Wolf | |
106 | 75bab85c | Kevin Wolf | typedef struct Qcow2UnknownHeaderExtension { |
107 | 75bab85c | Kevin Wolf | uint32_t magic; |
108 | 75bab85c | Kevin Wolf | uint32_t len; |
109 | 75bab85c | Kevin Wolf | QLIST_ENTRY(Qcow2UnknownHeaderExtension) next; |
110 | 75bab85c | Kevin Wolf | uint8_t data[]; |
111 | 75bab85c | Kevin Wolf | } Qcow2UnknownHeaderExtension; |
112 | 75bab85c | Kevin Wolf | |
113 | cfcc4c62 | Kevin Wolf | enum {
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114 | cfcc4c62 | Kevin Wolf | QCOW2_FEAT_TYPE_INCOMPATIBLE = 0,
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115 | cfcc4c62 | Kevin Wolf | QCOW2_FEAT_TYPE_COMPATIBLE = 1,
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116 | cfcc4c62 | Kevin Wolf | QCOW2_FEAT_TYPE_AUTOCLEAR = 2,
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117 | cfcc4c62 | Kevin Wolf | }; |
118 | cfcc4c62 | Kevin Wolf | |
119 | c61d0004 | Stefan Hajnoczi | /* Incompatible feature bits */
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120 | c61d0004 | Stefan Hajnoczi | enum {
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121 | c61d0004 | Stefan Hajnoczi | QCOW2_INCOMPAT_DIRTY_BITNR = 0,
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122 | c61d0004 | Stefan Hajnoczi | QCOW2_INCOMPAT_DIRTY = 1 << QCOW2_INCOMPAT_DIRTY_BITNR,
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123 | c61d0004 | Stefan Hajnoczi | |
124 | c61d0004 | Stefan Hajnoczi | QCOW2_INCOMPAT_MASK = QCOW2_INCOMPAT_DIRTY, |
125 | c61d0004 | Stefan Hajnoczi | }; |
126 | c61d0004 | Stefan Hajnoczi | |
127 | bfe8043e | Stefan Hajnoczi | /* Compatible feature bits */
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128 | bfe8043e | Stefan Hajnoczi | enum {
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129 | bfe8043e | Stefan Hajnoczi | QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR = 0,
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130 | bfe8043e | Stefan Hajnoczi | QCOW2_COMPAT_LAZY_REFCOUNTS = 1 << QCOW2_COMPAT_LAZY_REFCOUNTS_BITNR,
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131 | bfe8043e | Stefan Hajnoczi | |
132 | bfe8043e | Stefan Hajnoczi | QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS, |
133 | bfe8043e | Stefan Hajnoczi | }; |
134 | bfe8043e | Stefan Hajnoczi | |
135 | 6cfcb9b8 | Kevin Wolf | enum qcow2_discard_type {
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136 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_NEVER = 0,
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137 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_ALWAYS, |
138 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_REQUEST, |
139 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_SNAPSHOT, |
140 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_OTHER, |
141 | 6cfcb9b8 | Kevin Wolf | QCOW2_DISCARD_MAX |
142 | 6cfcb9b8 | Kevin Wolf | }; |
143 | 6cfcb9b8 | Kevin Wolf | |
144 | cfcc4c62 | Kevin Wolf | typedef struct Qcow2Feature { |
145 | cfcc4c62 | Kevin Wolf | uint8_t type; |
146 | cfcc4c62 | Kevin Wolf | uint8_t bit; |
147 | cfcc4c62 | Kevin Wolf | char name[46]; |
148 | cfcc4c62 | Kevin Wolf | } QEMU_PACKED Qcow2Feature; |
149 | cfcc4c62 | Kevin Wolf | |
150 | 0b919fae | Kevin Wolf | typedef struct Qcow2DiscardRegion { |
151 | 0b919fae | Kevin Wolf | BlockDriverState *bs; |
152 | 0b919fae | Kevin Wolf | uint64_t offset; |
153 | 0b919fae | Kevin Wolf | uint64_t bytes; |
154 | 0b919fae | Kevin Wolf | QTAILQ_ENTRY(Qcow2DiscardRegion) next; |
155 | 0b919fae | Kevin Wolf | } Qcow2DiscardRegion; |
156 | 0b919fae | Kevin Wolf | |
157 | f7d0fe02 | Kevin Wolf | typedef struct BDRVQcowState { |
158 | f7d0fe02 | Kevin Wolf | int cluster_bits;
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159 | f7d0fe02 | Kevin Wolf | int cluster_size;
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160 | f7d0fe02 | Kevin Wolf | int cluster_sectors;
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161 | f7d0fe02 | Kevin Wolf | int l2_bits;
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162 | f7d0fe02 | Kevin Wolf | int l2_size;
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163 | f7d0fe02 | Kevin Wolf | int l1_size;
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164 | f7d0fe02 | Kevin Wolf | int l1_vm_state_index;
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165 | f7d0fe02 | Kevin Wolf | int csize_shift;
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166 | f7d0fe02 | Kevin Wolf | int csize_mask;
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167 | f7d0fe02 | Kevin Wolf | uint64_t cluster_offset_mask; |
168 | f7d0fe02 | Kevin Wolf | uint64_t l1_table_offset; |
169 | f7d0fe02 | Kevin Wolf | uint64_t *l1_table; |
170 | 29c1a730 | Kevin Wolf | |
171 | 29c1a730 | Kevin Wolf | Qcow2Cache* l2_table_cache; |
172 | 29c1a730 | Kevin Wolf | Qcow2Cache* refcount_block_cache; |
173 | 29c1a730 | Kevin Wolf | |
174 | f7d0fe02 | Kevin Wolf | uint8_t *cluster_cache; |
175 | f7d0fe02 | Kevin Wolf | uint8_t *cluster_data; |
176 | f7d0fe02 | Kevin Wolf | uint64_t cluster_cache_offset; |
177 | 72cf2d4f | Blue Swirl | QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs; |
178 | f7d0fe02 | Kevin Wolf | |
179 | f7d0fe02 | Kevin Wolf | uint64_t *refcount_table; |
180 | f7d0fe02 | Kevin Wolf | uint64_t refcount_table_offset; |
181 | f7d0fe02 | Kevin Wolf | uint32_t refcount_table_size; |
182 | f7d0fe02 | Kevin Wolf | int64_t free_cluster_index; |
183 | f7d0fe02 | Kevin Wolf | int64_t free_byte_offset; |
184 | f7d0fe02 | Kevin Wolf | |
185 | 68d100e9 | Kevin Wolf | CoMutex lock; |
186 | 68d100e9 | Kevin Wolf | |
187 | f7d0fe02 | Kevin Wolf | uint32_t crypt_method; /* current crypt method, 0 if no key yet */
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188 | f7d0fe02 | Kevin Wolf | uint32_t crypt_method_header; |
189 | f7d0fe02 | Kevin Wolf | AES_KEY aes_encrypt_key; |
190 | f7d0fe02 | Kevin Wolf | AES_KEY aes_decrypt_key; |
191 | f7d0fe02 | Kevin Wolf | uint64_t snapshots_offset; |
192 | f7d0fe02 | Kevin Wolf | int snapshots_size;
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193 | f7d0fe02 | Kevin Wolf | int nb_snapshots;
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194 | f7d0fe02 | Kevin Wolf | QCowSnapshot *snapshots; |
195 | 06d9260f | Anthony Liguori | |
196 | 06d9260f | Anthony Liguori | int flags;
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197 | 6744cbab | Kevin Wolf | int qcow_version;
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198 | 74c4510a | Kevin Wolf | bool use_lazy_refcounts;
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199 | 6744cbab | Kevin Wolf | |
200 | 67af674e | Kevin Wolf | bool discard_passthrough[QCOW2_DISCARD_MAX];
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201 | 67af674e | Kevin Wolf | |
202 | 6744cbab | Kevin Wolf | uint64_t incompatible_features; |
203 | 6744cbab | Kevin Wolf | uint64_t compatible_features; |
204 | 6744cbab | Kevin Wolf | uint64_t autoclear_features; |
205 | 6744cbab | Kevin Wolf | |
206 | 6744cbab | Kevin Wolf | size_t unknown_header_fields_size; |
207 | 6744cbab | Kevin Wolf | void* unknown_header_fields;
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208 | 75bab85c | Kevin Wolf | QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext; |
209 | 0b919fae | Kevin Wolf | QTAILQ_HEAD (, Qcow2DiscardRegion) discards; |
210 | 0b919fae | Kevin Wolf | bool cache_discards;
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211 | f7d0fe02 | Kevin Wolf | } BDRVQcowState; |
212 | f7d0fe02 | Kevin Wolf | |
213 | f7d0fe02 | Kevin Wolf | /* XXX: use std qcow open function ? */
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214 | f7d0fe02 | Kevin Wolf | typedef struct QCowCreateState { |
215 | f7d0fe02 | Kevin Wolf | int cluster_size;
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216 | f7d0fe02 | Kevin Wolf | int cluster_bits;
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217 | f7d0fe02 | Kevin Wolf | uint16_t *refcount_block; |
218 | f7d0fe02 | Kevin Wolf | uint64_t *refcount_table; |
219 | f7d0fe02 | Kevin Wolf | int64_t l1_table_offset; |
220 | f7d0fe02 | Kevin Wolf | int64_t refcount_table_offset; |
221 | f7d0fe02 | Kevin Wolf | int64_t refcount_block_offset; |
222 | f7d0fe02 | Kevin Wolf | } QCowCreateState; |
223 | f7d0fe02 | Kevin Wolf | |
224 | f214978a | Kevin Wolf | struct QCowAIOCB;
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225 | f214978a | Kevin Wolf | |
226 | 593fb83c | Kevin Wolf | typedef struct Qcow2COWRegion { |
227 | 593fb83c | Kevin Wolf | /**
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228 | 593fb83c | Kevin Wolf | * Offset of the COW region in bytes from the start of the first cluster
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229 | 593fb83c | Kevin Wolf | * touched by the request.
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230 | 593fb83c | Kevin Wolf | */
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231 | 593fb83c | Kevin Wolf | uint64_t offset; |
232 | 593fb83c | Kevin Wolf | |
233 | 593fb83c | Kevin Wolf | /** Number of sectors to copy */
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234 | 593fb83c | Kevin Wolf | int nb_sectors;
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235 | 593fb83c | Kevin Wolf | } Qcow2COWRegion; |
236 | 593fb83c | Kevin Wolf | |
237 | f50f88b9 | Kevin Wolf | /**
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238 | f50f88b9 | Kevin Wolf | * Describes an in-flight (part of a) write request that writes to clusters
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239 | f50f88b9 | Kevin Wolf | * that are not referenced in their L2 table yet.
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240 | f50f88b9 | Kevin Wolf | */
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241 | 45aba42f | Kevin Wolf | typedef struct QCowL2Meta |
242 | 45aba42f | Kevin Wolf | { |
243 | 1d3afd64 | Kevin Wolf | /** Guest offset of the first newly allocated cluster */
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244 | 45aba42f | Kevin Wolf | uint64_t offset; |
245 | 1d3afd64 | Kevin Wolf | |
246 | 1d3afd64 | Kevin Wolf | /** Host offset of the first newly allocated cluster */
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247 | 250196f1 | Kevin Wolf | uint64_t alloc_offset; |
248 | 1d3afd64 | Kevin Wolf | |
249 | 1d3afd64 | Kevin Wolf | /**
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250 | 1d3afd64 | Kevin Wolf | * Number of sectors from the start of the first allocated cluster to
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251 | 1d3afd64 | Kevin Wolf | * the end of the (possibly shortened) request
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252 | 1d3afd64 | Kevin Wolf | */
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253 | 45aba42f | Kevin Wolf | int nb_available;
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254 | 1d3afd64 | Kevin Wolf | |
255 | 1d3afd64 | Kevin Wolf | /** Number of newly allocated clusters */
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256 | 45aba42f | Kevin Wolf | int nb_clusters;
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257 | 1d3afd64 | Kevin Wolf | |
258 | 1d3afd64 | Kevin Wolf | /**
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259 | 1d3afd64 | Kevin Wolf | * Requests that overlap with this allocation and wait to be restarted
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260 | 1d3afd64 | Kevin Wolf | * when the allocating request has completed.
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261 | 1d3afd64 | Kevin Wolf | */
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262 | 68d100e9 | Kevin Wolf | CoQueue dependent_requests; |
263 | f214978a | Kevin Wolf | |
264 | 593fb83c | Kevin Wolf | /**
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265 | 593fb83c | Kevin Wolf | * The COW Region between the start of the first allocated cluster and the
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266 | 593fb83c | Kevin Wolf | * area the guest actually writes to.
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267 | 593fb83c | Kevin Wolf | */
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268 | 593fb83c | Kevin Wolf | Qcow2COWRegion cow_start; |
269 | 593fb83c | Kevin Wolf | |
270 | 593fb83c | Kevin Wolf | /**
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271 | 593fb83c | Kevin Wolf | * The COW Region between the area the guest actually writes to and the
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272 | 593fb83c | Kevin Wolf | * end of the last allocated cluster.
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273 | 593fb83c | Kevin Wolf | */
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274 | 593fb83c | Kevin Wolf | Qcow2COWRegion cow_end; |
275 | 593fb83c | Kevin Wolf | |
276 | 88c6588c | Kevin Wolf | /** Pointer to next L2Meta of the same write request */
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277 | 88c6588c | Kevin Wolf | struct QCowL2Meta *next;
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278 | 88c6588c | Kevin Wolf | |
279 | 72cf2d4f | Blue Swirl | QLIST_ENTRY(QCowL2Meta) next_in_flight; |
280 | 45aba42f | Kevin Wolf | } QCowL2Meta; |
281 | 45aba42f | Kevin Wolf | |
282 | 68d000a3 | Kevin Wolf | enum {
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283 | 68d000a3 | Kevin Wolf | QCOW2_CLUSTER_UNALLOCATED, |
284 | 68d000a3 | Kevin Wolf | QCOW2_CLUSTER_NORMAL, |
285 | 68d000a3 | Kevin Wolf | QCOW2_CLUSTER_COMPRESSED, |
286 | 6377af48 | Kevin Wolf | QCOW2_CLUSTER_ZERO |
287 | 68d000a3 | Kevin Wolf | }; |
288 | 68d000a3 | Kevin Wolf | |
289 | 68d000a3 | Kevin Wolf | #define L1E_OFFSET_MASK 0x00ffffffffffff00ULL |
290 | 68d000a3 | Kevin Wolf | #define L2E_OFFSET_MASK 0x00ffffffffffff00ULL |
291 | 68d000a3 | Kevin Wolf | #define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL |
292 | 68d000a3 | Kevin Wolf | |
293 | 76dc9e0c | Kevin Wolf | #define REFT_OFFSET_MASK 0xffffffffffffff00ULL |
294 | 76dc9e0c | Kevin Wolf | |
295 | 3b8e2e26 | Kevin Wolf | static inline int64_t start_of_cluster(BDRVQcowState *s, int64_t offset) |
296 | 3b8e2e26 | Kevin Wolf | { |
297 | 3b8e2e26 | Kevin Wolf | return offset & ~(s->cluster_size - 1); |
298 | 3b8e2e26 | Kevin Wolf | } |
299 | 3b8e2e26 | Kevin Wolf | |
300 | c37f4cd7 | Kevin Wolf | static inline int64_t offset_into_cluster(BDRVQcowState *s, int64_t offset) |
301 | c37f4cd7 | Kevin Wolf | { |
302 | c37f4cd7 | Kevin Wolf | return offset & (s->cluster_size - 1); |
303 | c37f4cd7 | Kevin Wolf | } |
304 | c37f4cd7 | Kevin Wolf | |
305 | 45aba42f | Kevin Wolf | static inline int size_to_clusters(BDRVQcowState *s, int64_t size) |
306 | f7d0fe02 | Kevin Wolf | { |
307 | f7d0fe02 | Kevin Wolf | return (size + (s->cluster_size - 1)) >> s->cluster_bits; |
308 | f7d0fe02 | Kevin Wolf | } |
309 | f7d0fe02 | Kevin Wolf | |
310 | 2cf7cfa1 | Kevin Wolf | static inline int64_t size_to_l1(BDRVQcowState *s, int64_t size) |
311 | 419b19d9 | Stefan Hajnoczi | { |
312 | 419b19d9 | Stefan Hajnoczi | int shift = s->cluster_bits + s->l2_bits;
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313 | 419b19d9 | Stefan Hajnoczi | return (size + (1ULL << shift) - 1) >> shift; |
314 | 419b19d9 | Stefan Hajnoczi | } |
315 | 419b19d9 | Stefan Hajnoczi | |
316 | 17a71e58 | Kevin Wolf | static inline int offset_to_l2_index(BDRVQcowState *s, int64_t offset) |
317 | 17a71e58 | Kevin Wolf | { |
318 | 17a71e58 | Kevin Wolf | return (offset >> s->cluster_bits) & (s->l2_size - 1); |
319 | 17a71e58 | Kevin Wolf | } |
320 | 17a71e58 | Kevin Wolf | |
321 | c142442b | Kevin Wolf | static inline int64_t align_offset(int64_t offset, int n) |
322 | c142442b | Kevin Wolf | { |
323 | c142442b | Kevin Wolf | offset = (offset + n - 1) & ~(n - 1); |
324 | c142442b | Kevin Wolf | return offset;
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325 | c142442b | Kevin Wolf | } |
326 | c142442b | Kevin Wolf | |
327 | 68d000a3 | Kevin Wolf | static inline int qcow2_get_cluster_type(uint64_t l2_entry) |
328 | 68d000a3 | Kevin Wolf | { |
329 | 68d000a3 | Kevin Wolf | if (l2_entry & QCOW_OFLAG_COMPRESSED) {
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330 | 68d000a3 | Kevin Wolf | return QCOW2_CLUSTER_COMPRESSED;
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331 | 6377af48 | Kevin Wolf | } else if (l2_entry & QCOW_OFLAG_ZERO) { |
332 | 6377af48 | Kevin Wolf | return QCOW2_CLUSTER_ZERO;
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333 | 68d000a3 | Kevin Wolf | } else if (!(l2_entry & L2E_OFFSET_MASK)) { |
334 | 68d000a3 | Kevin Wolf | return QCOW2_CLUSTER_UNALLOCATED;
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335 | 68d000a3 | Kevin Wolf | } else {
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336 | 68d000a3 | Kevin Wolf | return QCOW2_CLUSTER_NORMAL;
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337 | 68d000a3 | Kevin Wolf | } |
338 | 68d000a3 | Kevin Wolf | } |
339 | 68d000a3 | Kevin Wolf | |
340 | bfe8043e | Stefan Hajnoczi | /* Check whether refcounts are eager or lazy */
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341 | bfe8043e | Stefan Hajnoczi | static inline bool qcow2_need_accurate_refcounts(BDRVQcowState *s) |
342 | bfe8043e | Stefan Hajnoczi | { |
343 | bfe8043e | Stefan Hajnoczi | return !(s->incompatible_features & QCOW2_INCOMPAT_DIRTY);
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344 | bfe8043e | Stefan Hajnoczi | } |
345 | c142442b | Kevin Wolf | |
346 | 65eb2e35 | Kevin Wolf | static inline uint64_t l2meta_cow_start(QCowL2Meta *m) |
347 | 65eb2e35 | Kevin Wolf | { |
348 | 65eb2e35 | Kevin Wolf | return m->offset + m->cow_start.offset;
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349 | 65eb2e35 | Kevin Wolf | } |
350 | 65eb2e35 | Kevin Wolf | |
351 | 65eb2e35 | Kevin Wolf | static inline uint64_t l2meta_cow_end(QCowL2Meta *m) |
352 | 65eb2e35 | Kevin Wolf | { |
353 | 65eb2e35 | Kevin Wolf | return m->offset + m->cow_end.offset
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354 | 65eb2e35 | Kevin Wolf | + (m->cow_end.nb_sectors << BDRV_SECTOR_BITS); |
355 | 65eb2e35 | Kevin Wolf | } |
356 | 65eb2e35 | Kevin Wolf | |
357 | f7d0fe02 | Kevin Wolf | // FIXME Need qcow2_ prefix to global functions
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358 | f7d0fe02 | Kevin Wolf | |
359 | f7d0fe02 | Kevin Wolf | /* qcow2.c functions */
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360 | bd28f835 | Kevin Wolf | int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
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361 | bd28f835 | Kevin Wolf | int64_t sector_num, int nb_sectors);
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362 | 280d3735 | Kevin Wolf | |
363 | 280d3735 | Kevin Wolf | int qcow2_mark_dirty(BlockDriverState *bs);
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364 | e24e49e6 | Kevin Wolf | int qcow2_update_header(BlockDriverState *bs);
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365 | f7d0fe02 | Kevin Wolf | |
366 | f7d0fe02 | Kevin Wolf | /* qcow2-refcount.c functions */
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367 | ed6ccf0f | Kevin Wolf | int qcow2_refcount_init(BlockDriverState *bs);
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368 | ed6ccf0f | Kevin Wolf | void qcow2_refcount_close(BlockDriverState *bs);
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369 | f7d0fe02 | Kevin Wolf | |
370 | ed6ccf0f | Kevin Wolf | int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size); |
371 | 256900b1 | Kevin Wolf | int qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
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372 | 256900b1 | Kevin Wolf | int nb_clusters);
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373 | ed6ccf0f | Kevin Wolf | int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
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374 | ed6ccf0f | Kevin Wolf | void qcow2_free_clusters(BlockDriverState *bs,
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375 | 6cfcb9b8 | Kevin Wolf | int64_t offset, int64_t size, |
376 | 6cfcb9b8 | Kevin Wolf | enum qcow2_discard_type type);
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377 | 6cfcb9b8 | Kevin Wolf | void qcow2_free_any_clusters(BlockDriverState *bs, uint64_t l2_entry,
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378 | 6cfcb9b8 | Kevin Wolf | int nb_clusters, enum qcow2_discard_type type); |
379 | f7d0fe02 | Kevin Wolf | |
380 | ed6ccf0f | Kevin Wolf | int qcow2_update_snapshot_refcount(BlockDriverState *bs,
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381 | ed6ccf0f | Kevin Wolf | int64_t l1_table_offset, int l1_size, int addend); |
382 | f7d0fe02 | Kevin Wolf | |
383 | 166acf54 | Kevin Wolf | int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res,
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384 | 166acf54 | Kevin Wolf | BdrvCheckMode fix); |
385 | f7d0fe02 | Kevin Wolf | |
386 | 0b919fae | Kevin Wolf | void qcow2_process_discards(BlockDriverState *bs, int ret); |
387 | 0b919fae | Kevin Wolf | |
388 | 45aba42f | Kevin Wolf | /* qcow2-cluster.c functions */
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389 | 2cf7cfa1 | Kevin Wolf | int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size,
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390 | 2cf7cfa1 | Kevin Wolf | bool exact_size);
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391 | ed6ccf0f | Kevin Wolf | void qcow2_l2_cache_reset(BlockDriverState *bs);
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392 | 66f82cee | Kevin Wolf | int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
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393 | ed6ccf0f | Kevin Wolf | void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
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394 | 45aba42f | Kevin Wolf | uint8_t *out_buf, const uint8_t *in_buf,
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395 | 45aba42f | Kevin Wolf | int nb_sectors, int enc, |
396 | 45aba42f | Kevin Wolf | const AES_KEY *key);
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397 | 45aba42f | Kevin Wolf | |
398 | 1c46efaa | Kevin Wolf | int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
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399 | 1c46efaa | Kevin Wolf | int *num, uint64_t *cluster_offset);
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400 | f4f0d391 | Kevin Wolf | int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
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401 | f50f88b9 | Kevin Wolf | int n_start, int n_end, int *num, uint64_t *host_offset, QCowL2Meta **m); |
402 | ed6ccf0f | Kevin Wolf | uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs, |
403 | 45aba42f | Kevin Wolf | uint64_t offset, |
404 | 45aba42f | Kevin Wolf | int compressed_size);
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405 | 45aba42f | Kevin Wolf | |
406 | 148da7ea | Kevin Wolf | int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
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407 | 5ea929e3 | Kevin Wolf | int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset,
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408 | 5ea929e3 | Kevin Wolf | int nb_sectors);
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409 | 621f0589 | Kevin Wolf | int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors); |
410 | 45aba42f | Kevin Wolf | |
411 | c142442b | Kevin Wolf | /* qcow2-snapshot.c functions */
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412 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
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413 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id); |
414 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id); |
415 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
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416 | 51ef6727 | edison | int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name); |
417 | c142442b | Kevin Wolf | |
418 | ed6ccf0f | Kevin Wolf | void qcow2_free_snapshots(BlockDriverState *bs);
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419 | ed6ccf0f | Kevin Wolf | int qcow2_read_snapshots(BlockDriverState *bs);
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420 | c142442b | Kevin Wolf | |
421 | 49381094 | Kevin Wolf | /* qcow2-cache.c functions */
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422 | 6af4e9ea | Paolo Bonzini | Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables);
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423 | 49381094 | Kevin Wolf | int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
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424 | 49381094 | Kevin Wolf | |
425 | 49381094 | Kevin Wolf | void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table); |
426 | 49381094 | Kevin Wolf | int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
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427 | 49381094 | Kevin Wolf | int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
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428 | 49381094 | Kevin Wolf | Qcow2Cache *dependency); |
429 | 3de0a294 | Kevin Wolf | void qcow2_cache_depends_on_flush(Qcow2Cache *c);
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430 | 49381094 | Kevin Wolf | |
431 | 49381094 | Kevin Wolf | int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
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432 | 49381094 | Kevin Wolf | void **table);
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433 | 49381094 | Kevin Wolf | int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
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434 | 49381094 | Kevin Wolf | void **table);
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435 | 49381094 | Kevin Wolf | int qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); |
436 | 49381094 | Kevin Wolf | |
437 | f7d0fe02 | Kevin Wolf | #endif |