root / block / qcow2-snapshot.c @ 1e5b9d2f
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1 | c142442b | Kevin Wolf | /*
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2 | c142442b | Kevin Wolf | * Block driver for the QCOW version 2 format
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3 | c142442b | Kevin Wolf | *
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4 | c142442b | Kevin Wolf | * Copyright (c) 2004-2006 Fabrice Bellard
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5 | c142442b | Kevin Wolf | *
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6 | c142442b | Kevin Wolf | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | c142442b | Kevin Wolf | * of this software and associated documentation files (the "Software"), to deal
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8 | c142442b | Kevin Wolf | * in the Software without restriction, including without limitation the rights
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9 | c142442b | Kevin Wolf | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | c142442b | Kevin Wolf | * copies of the Software, and to permit persons to whom the Software is
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11 | c142442b | Kevin Wolf | * furnished to do so, subject to the following conditions:
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12 | c142442b | Kevin Wolf | *
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13 | c142442b | Kevin Wolf | * The above copyright notice and this permission notice shall be included in
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14 | c142442b | Kevin Wolf | * all copies or substantial portions of the Software.
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15 | c142442b | Kevin Wolf | *
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16 | c142442b | Kevin Wolf | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | c142442b | Kevin Wolf | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | c142442b | Kevin Wolf | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | c142442b | Kevin Wolf | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | c142442b | Kevin Wolf | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | c142442b | Kevin Wolf | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | c142442b | Kevin Wolf | * THE SOFTWARE.
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23 | c142442b | Kevin Wolf | */
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24 | c142442b | Kevin Wolf | |
25 | c142442b | Kevin Wolf | #include "qemu-common.h" |
26 | c142442b | Kevin Wolf | #include "block_int.h" |
27 | c142442b | Kevin Wolf | #include "block/qcow2.h" |
28 | c142442b | Kevin Wolf | |
29 | c142442b | Kevin Wolf | typedef struct __attribute__((packed)) QCowSnapshotHeader { |
30 | c142442b | Kevin Wolf | /* header is 8 byte aligned */
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31 | c142442b | Kevin Wolf | uint64_t l1_table_offset; |
32 | c142442b | Kevin Wolf | |
33 | c142442b | Kevin Wolf | uint32_t l1_size; |
34 | c142442b | Kevin Wolf | uint16_t id_str_size; |
35 | c142442b | Kevin Wolf | uint16_t name_size; |
36 | c142442b | Kevin Wolf | |
37 | c142442b | Kevin Wolf | uint32_t date_sec; |
38 | c142442b | Kevin Wolf | uint32_t date_nsec; |
39 | c142442b | Kevin Wolf | |
40 | c142442b | Kevin Wolf | uint64_t vm_clock_nsec; |
41 | c142442b | Kevin Wolf | |
42 | c142442b | Kevin Wolf | uint32_t vm_state_size; |
43 | c142442b | Kevin Wolf | uint32_t extra_data_size; /* for extension */
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44 | c142442b | Kevin Wolf | /* extra data follows */
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45 | c142442b | Kevin Wolf | /* id_str follows */
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46 | c142442b | Kevin Wolf | /* name follows */
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47 | c142442b | Kevin Wolf | } QCowSnapshotHeader; |
48 | c142442b | Kevin Wolf | |
49 | ed6ccf0f | Kevin Wolf | void qcow2_free_snapshots(BlockDriverState *bs)
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50 | c142442b | Kevin Wolf | { |
51 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
52 | c142442b | Kevin Wolf | int i;
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53 | c142442b | Kevin Wolf | |
54 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
55 | c142442b | Kevin Wolf | qemu_free(s->snapshots[i].name); |
56 | c142442b | Kevin Wolf | qemu_free(s->snapshots[i].id_str); |
57 | c142442b | Kevin Wolf | } |
58 | c142442b | Kevin Wolf | qemu_free(s->snapshots); |
59 | c142442b | Kevin Wolf | s->snapshots = NULL;
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60 | c142442b | Kevin Wolf | s->nb_snapshots = 0;
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61 | c142442b | Kevin Wolf | } |
62 | c142442b | Kevin Wolf | |
63 | ed6ccf0f | Kevin Wolf | int qcow2_read_snapshots(BlockDriverState *bs)
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64 | c142442b | Kevin Wolf | { |
65 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
66 | c142442b | Kevin Wolf | QCowSnapshotHeader h; |
67 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
68 | c142442b | Kevin Wolf | int i, id_str_size, name_size;
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69 | c142442b | Kevin Wolf | int64_t offset; |
70 | c142442b | Kevin Wolf | uint32_t extra_data_size; |
71 | c142442b | Kevin Wolf | |
72 | c142442b | Kevin Wolf | if (!s->nb_snapshots) {
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73 | c142442b | Kevin Wolf | s->snapshots = NULL;
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74 | c142442b | Kevin Wolf | s->snapshots_size = 0;
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75 | c142442b | Kevin Wolf | return 0; |
76 | c142442b | Kevin Wolf | } |
77 | c142442b | Kevin Wolf | |
78 | c142442b | Kevin Wolf | offset = s->snapshots_offset; |
79 | c142442b | Kevin Wolf | s->snapshots = qemu_mallocz(s->nb_snapshots * sizeof(QCowSnapshot));
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80 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
81 | c142442b | Kevin Wolf | offset = align_offset(offset, 8);
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82 | c142442b | Kevin Wolf | if (bdrv_pread(s->hd, offset, &h, sizeof(h)) != sizeof(h)) |
83 | c142442b | Kevin Wolf | goto fail;
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84 | c142442b | Kevin Wolf | offset += sizeof(h);
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85 | c142442b | Kevin Wolf | sn = s->snapshots + i; |
86 | c142442b | Kevin Wolf | sn->l1_table_offset = be64_to_cpu(h.l1_table_offset); |
87 | c142442b | Kevin Wolf | sn->l1_size = be32_to_cpu(h.l1_size); |
88 | c142442b | Kevin Wolf | sn->vm_state_size = be32_to_cpu(h.vm_state_size); |
89 | c142442b | Kevin Wolf | sn->date_sec = be32_to_cpu(h.date_sec); |
90 | c142442b | Kevin Wolf | sn->date_nsec = be32_to_cpu(h.date_nsec); |
91 | c142442b | Kevin Wolf | sn->vm_clock_nsec = be64_to_cpu(h.vm_clock_nsec); |
92 | c142442b | Kevin Wolf | extra_data_size = be32_to_cpu(h.extra_data_size); |
93 | c142442b | Kevin Wolf | |
94 | c142442b | Kevin Wolf | id_str_size = be16_to_cpu(h.id_str_size); |
95 | c142442b | Kevin Wolf | name_size = be16_to_cpu(h.name_size); |
96 | c142442b | Kevin Wolf | |
97 | c142442b | Kevin Wolf | offset += extra_data_size; |
98 | c142442b | Kevin Wolf | |
99 | c142442b | Kevin Wolf | sn->id_str = qemu_malloc(id_str_size + 1);
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100 | c142442b | Kevin Wolf | if (bdrv_pread(s->hd, offset, sn->id_str, id_str_size) != id_str_size)
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101 | c142442b | Kevin Wolf | goto fail;
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102 | c142442b | Kevin Wolf | offset += id_str_size; |
103 | c142442b | Kevin Wolf | sn->id_str[id_str_size] = '\0';
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104 | c142442b | Kevin Wolf | |
105 | c142442b | Kevin Wolf | sn->name = qemu_malloc(name_size + 1);
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106 | c142442b | Kevin Wolf | if (bdrv_pread(s->hd, offset, sn->name, name_size) != name_size)
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107 | c142442b | Kevin Wolf | goto fail;
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108 | c142442b | Kevin Wolf | offset += name_size; |
109 | c142442b | Kevin Wolf | sn->name[name_size] = '\0';
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110 | c142442b | Kevin Wolf | } |
111 | c142442b | Kevin Wolf | s->snapshots_size = offset - s->snapshots_offset; |
112 | c142442b | Kevin Wolf | return 0; |
113 | c142442b | Kevin Wolf | fail:
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114 | ed6ccf0f | Kevin Wolf | qcow2_free_snapshots(bs); |
115 | c142442b | Kevin Wolf | return -1; |
116 | c142442b | Kevin Wolf | } |
117 | c142442b | Kevin Wolf | |
118 | c142442b | Kevin Wolf | /* add at the end of the file a new list of snapshots */
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119 | c142442b | Kevin Wolf | static int qcow_write_snapshots(BlockDriverState *bs) |
120 | c142442b | Kevin Wolf | { |
121 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
122 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
123 | c142442b | Kevin Wolf | QCowSnapshotHeader h; |
124 | c142442b | Kevin Wolf | int i, name_size, id_str_size, snapshots_size;
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125 | c142442b | Kevin Wolf | uint64_t data64; |
126 | c142442b | Kevin Wolf | uint32_t data32; |
127 | c142442b | Kevin Wolf | int64_t offset, snapshots_offset; |
128 | c142442b | Kevin Wolf | |
129 | c142442b | Kevin Wolf | /* compute the size of the snapshots */
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130 | c142442b | Kevin Wolf | offset = 0;
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131 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
132 | c142442b | Kevin Wolf | sn = s->snapshots + i; |
133 | c142442b | Kevin Wolf | offset = align_offset(offset, 8);
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134 | c142442b | Kevin Wolf | offset += sizeof(h);
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135 | c142442b | Kevin Wolf | offset += strlen(sn->id_str); |
136 | c142442b | Kevin Wolf | offset += strlen(sn->name); |
137 | c142442b | Kevin Wolf | } |
138 | c142442b | Kevin Wolf | snapshots_size = offset; |
139 | c142442b | Kevin Wolf | |
140 | ed6ccf0f | Kevin Wolf | snapshots_offset = qcow2_alloc_clusters(bs, snapshots_size); |
141 | c142442b | Kevin Wolf | offset = snapshots_offset; |
142 | c142442b | Kevin Wolf | |
143 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
144 | c142442b | Kevin Wolf | sn = s->snapshots + i; |
145 | c142442b | Kevin Wolf | memset(&h, 0, sizeof(h)); |
146 | c142442b | Kevin Wolf | h.l1_table_offset = cpu_to_be64(sn->l1_table_offset); |
147 | c142442b | Kevin Wolf | h.l1_size = cpu_to_be32(sn->l1_size); |
148 | c142442b | Kevin Wolf | h.vm_state_size = cpu_to_be32(sn->vm_state_size); |
149 | c142442b | Kevin Wolf | h.date_sec = cpu_to_be32(sn->date_sec); |
150 | c142442b | Kevin Wolf | h.date_nsec = cpu_to_be32(sn->date_nsec); |
151 | c142442b | Kevin Wolf | h.vm_clock_nsec = cpu_to_be64(sn->vm_clock_nsec); |
152 | c142442b | Kevin Wolf | |
153 | c142442b | Kevin Wolf | id_str_size = strlen(sn->id_str); |
154 | c142442b | Kevin Wolf | name_size = strlen(sn->name); |
155 | c142442b | Kevin Wolf | h.id_str_size = cpu_to_be16(id_str_size); |
156 | c142442b | Kevin Wolf | h.name_size = cpu_to_be16(name_size); |
157 | c142442b | Kevin Wolf | offset = align_offset(offset, 8);
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158 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, offset, &h, sizeof(h)) != sizeof(h)) |
159 | c142442b | Kevin Wolf | goto fail;
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160 | c142442b | Kevin Wolf | offset += sizeof(h);
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161 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, offset, sn->id_str, id_str_size) != id_str_size)
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162 | c142442b | Kevin Wolf | goto fail;
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163 | c142442b | Kevin Wolf | offset += id_str_size; |
164 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, offset, sn->name, name_size) != name_size)
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165 | c142442b | Kevin Wolf | goto fail;
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166 | c142442b | Kevin Wolf | offset += name_size; |
167 | c142442b | Kevin Wolf | } |
168 | c142442b | Kevin Wolf | |
169 | c142442b | Kevin Wolf | /* update the various header fields */
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170 | c142442b | Kevin Wolf | data64 = cpu_to_be64(snapshots_offset); |
171 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, offsetof(QCowHeader, snapshots_offset),
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172 | c142442b | Kevin Wolf | &data64, sizeof(data64)) != sizeof(data64)) |
173 | c142442b | Kevin Wolf | goto fail;
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174 | c142442b | Kevin Wolf | data32 = cpu_to_be32(s->nb_snapshots); |
175 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, offsetof(QCowHeader, nb_snapshots),
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176 | c142442b | Kevin Wolf | &data32, sizeof(data32)) != sizeof(data32)) |
177 | c142442b | Kevin Wolf | goto fail;
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178 | c142442b | Kevin Wolf | |
179 | c142442b | Kevin Wolf | /* free the old snapshot table */
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180 | ed6ccf0f | Kevin Wolf | qcow2_free_clusters(bs, s->snapshots_offset, s->snapshots_size); |
181 | c142442b | Kevin Wolf | s->snapshots_offset = snapshots_offset; |
182 | c142442b | Kevin Wolf | s->snapshots_size = snapshots_size; |
183 | c142442b | Kevin Wolf | return 0; |
184 | c142442b | Kevin Wolf | fail:
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185 | c142442b | Kevin Wolf | return -1; |
186 | c142442b | Kevin Wolf | } |
187 | c142442b | Kevin Wolf | |
188 | c142442b | Kevin Wolf | static void find_new_snapshot_id(BlockDriverState *bs, |
189 | c142442b | Kevin Wolf | char *id_str, int id_str_size) |
190 | c142442b | Kevin Wolf | { |
191 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
192 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
193 | c142442b | Kevin Wolf | int i, id, id_max = 0; |
194 | c142442b | Kevin Wolf | |
195 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
196 | c142442b | Kevin Wolf | sn = s->snapshots + i; |
197 | c142442b | Kevin Wolf | id = strtoul(sn->id_str, NULL, 10); |
198 | c142442b | Kevin Wolf | if (id > id_max)
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199 | c142442b | Kevin Wolf | id_max = id; |
200 | c142442b | Kevin Wolf | } |
201 | c142442b | Kevin Wolf | snprintf(id_str, id_str_size, "%d", id_max + 1); |
202 | c142442b | Kevin Wolf | } |
203 | c142442b | Kevin Wolf | |
204 | c142442b | Kevin Wolf | static int find_snapshot_by_id(BlockDriverState *bs, const char *id_str) |
205 | c142442b | Kevin Wolf | { |
206 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
207 | c142442b | Kevin Wolf | int i;
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208 | c142442b | Kevin Wolf | |
209 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
210 | c142442b | Kevin Wolf | if (!strcmp(s->snapshots[i].id_str, id_str))
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211 | c142442b | Kevin Wolf | return i;
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212 | c142442b | Kevin Wolf | } |
213 | c142442b | Kevin Wolf | return -1; |
214 | c142442b | Kevin Wolf | } |
215 | c142442b | Kevin Wolf | |
216 | c142442b | Kevin Wolf | static int find_snapshot_by_id_or_name(BlockDriverState *bs, const char *name) |
217 | c142442b | Kevin Wolf | { |
218 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
219 | c142442b | Kevin Wolf | int i, ret;
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220 | c142442b | Kevin Wolf | |
221 | c142442b | Kevin Wolf | ret = find_snapshot_by_id(bs, name); |
222 | c142442b | Kevin Wolf | if (ret >= 0) |
223 | c142442b | Kevin Wolf | return ret;
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224 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
225 | c142442b | Kevin Wolf | if (!strcmp(s->snapshots[i].name, name))
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226 | c142442b | Kevin Wolf | return i;
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227 | c142442b | Kevin Wolf | } |
228 | c142442b | Kevin Wolf | return -1; |
229 | c142442b | Kevin Wolf | } |
230 | c142442b | Kevin Wolf | |
231 | c142442b | Kevin Wolf | /* if no id is provided, a new one is constructed */
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232 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
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233 | c142442b | Kevin Wolf | { |
234 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
235 | c142442b | Kevin Wolf | QCowSnapshot *snapshots1, sn1, *sn = &sn1; |
236 | c142442b | Kevin Wolf | int i, ret;
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237 | c142442b | Kevin Wolf | uint64_t *l1_table = NULL;
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238 | c142442b | Kevin Wolf | |
239 | c142442b | Kevin Wolf | memset(sn, 0, sizeof(*sn)); |
240 | c142442b | Kevin Wolf | |
241 | c142442b | Kevin Wolf | if (sn_info->id_str[0] == '\0') { |
242 | c142442b | Kevin Wolf | /* compute a new id */
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243 | c142442b | Kevin Wolf | find_new_snapshot_id(bs, sn_info->id_str, sizeof(sn_info->id_str));
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244 | c142442b | Kevin Wolf | } |
245 | c142442b | Kevin Wolf | |
246 | c142442b | Kevin Wolf | /* check that the ID is unique */
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247 | c142442b | Kevin Wolf | if (find_snapshot_by_id(bs, sn_info->id_str) >= 0) |
248 | c142442b | Kevin Wolf | return -ENOENT;
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249 | c142442b | Kevin Wolf | |
250 | c142442b | Kevin Wolf | sn->id_str = qemu_strdup(sn_info->id_str); |
251 | c142442b | Kevin Wolf | if (!sn->id_str)
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252 | c142442b | Kevin Wolf | goto fail;
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253 | c142442b | Kevin Wolf | sn->name = qemu_strdup(sn_info->name); |
254 | c142442b | Kevin Wolf | if (!sn->name)
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255 | c142442b | Kevin Wolf | goto fail;
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256 | c142442b | Kevin Wolf | sn->vm_state_size = sn_info->vm_state_size; |
257 | c142442b | Kevin Wolf | sn->date_sec = sn_info->date_sec; |
258 | c142442b | Kevin Wolf | sn->date_nsec = sn_info->date_nsec; |
259 | c142442b | Kevin Wolf | sn->vm_clock_nsec = sn_info->vm_clock_nsec; |
260 | c142442b | Kevin Wolf | |
261 | ed6ccf0f | Kevin Wolf | ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 1);
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262 | c142442b | Kevin Wolf | if (ret < 0) |
263 | c142442b | Kevin Wolf | goto fail;
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264 | c142442b | Kevin Wolf | |
265 | c142442b | Kevin Wolf | /* create the L1 table of the snapshot */
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266 | ed6ccf0f | Kevin Wolf | sn->l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t));
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267 | c142442b | Kevin Wolf | sn->l1_size = s->l1_size; |
268 | c142442b | Kevin Wolf | |
269 | c142442b | Kevin Wolf | l1_table = qemu_malloc(s->l1_size * sizeof(uint64_t));
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270 | c142442b | Kevin Wolf | for(i = 0; i < s->l1_size; i++) { |
271 | c142442b | Kevin Wolf | l1_table[i] = cpu_to_be64(s->l1_table[i]); |
272 | c142442b | Kevin Wolf | } |
273 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, sn->l1_table_offset,
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274 | c142442b | Kevin Wolf | l1_table, s->l1_size * sizeof(uint64_t)) !=
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275 | c142442b | Kevin Wolf | (s->l1_size * sizeof(uint64_t)))
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276 | c142442b | Kevin Wolf | goto fail;
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277 | c142442b | Kevin Wolf | qemu_free(l1_table); |
278 | c142442b | Kevin Wolf | l1_table = NULL;
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279 | c142442b | Kevin Wolf | |
280 | c142442b | Kevin Wolf | snapshots1 = qemu_malloc((s->nb_snapshots + 1) * sizeof(QCowSnapshot)); |
281 | c142442b | Kevin Wolf | if (s->snapshots) {
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282 | c142442b | Kevin Wolf | memcpy(snapshots1, s->snapshots, s->nb_snapshots * sizeof(QCowSnapshot));
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283 | c142442b | Kevin Wolf | qemu_free(s->snapshots); |
284 | c142442b | Kevin Wolf | } |
285 | c142442b | Kevin Wolf | s->snapshots = snapshots1; |
286 | c142442b | Kevin Wolf | s->snapshots[s->nb_snapshots++] = *sn; |
287 | c142442b | Kevin Wolf | |
288 | c142442b | Kevin Wolf | if (qcow_write_snapshots(bs) < 0) |
289 | c142442b | Kevin Wolf | goto fail;
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290 | c142442b | Kevin Wolf | #ifdef DEBUG_ALLOC
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291 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
292 | c142442b | Kevin Wolf | #endif
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293 | c142442b | Kevin Wolf | return 0; |
294 | c142442b | Kevin Wolf | fail:
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295 | c142442b | Kevin Wolf | qemu_free(sn->name); |
296 | c142442b | Kevin Wolf | qemu_free(l1_table); |
297 | c142442b | Kevin Wolf | return -1; |
298 | c142442b | Kevin Wolf | } |
299 | c142442b | Kevin Wolf | |
300 | c142442b | Kevin Wolf | /* copy the snapshot 'snapshot_name' into the current disk image */
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301 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id) |
302 | c142442b | Kevin Wolf | { |
303 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
304 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
305 | c142442b | Kevin Wolf | int i, snapshot_index, l1_size2;
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306 | c142442b | Kevin Wolf | |
307 | c142442b | Kevin Wolf | snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id); |
308 | c142442b | Kevin Wolf | if (snapshot_index < 0) |
309 | c142442b | Kevin Wolf | return -ENOENT;
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310 | c142442b | Kevin Wolf | sn = &s->snapshots[snapshot_index]; |
311 | c142442b | Kevin Wolf | |
312 | ed6ccf0f | Kevin Wolf | if (qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, -1) < 0) |
313 | c142442b | Kevin Wolf | goto fail;
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314 | c142442b | Kevin Wolf | |
315 | ed6ccf0f | Kevin Wolf | if (qcow2_grow_l1_table(bs, sn->l1_size) < 0) |
316 | c142442b | Kevin Wolf | goto fail;
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317 | c142442b | Kevin Wolf | |
318 | c142442b | Kevin Wolf | s->l1_size = sn->l1_size; |
319 | c142442b | Kevin Wolf | l1_size2 = s->l1_size * sizeof(uint64_t);
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320 | c142442b | Kevin Wolf | /* copy the snapshot l1 table to the current l1 table */
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321 | c142442b | Kevin Wolf | if (bdrv_pread(s->hd, sn->l1_table_offset,
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322 | c142442b | Kevin Wolf | s->l1_table, l1_size2) != l1_size2) |
323 | c142442b | Kevin Wolf | goto fail;
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324 | c142442b | Kevin Wolf | if (bdrv_pwrite(s->hd, s->l1_table_offset,
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325 | c142442b | Kevin Wolf | s->l1_table, l1_size2) != l1_size2) |
326 | c142442b | Kevin Wolf | goto fail;
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327 | c142442b | Kevin Wolf | for(i = 0;i < s->l1_size; i++) { |
328 | c142442b | Kevin Wolf | be64_to_cpus(&s->l1_table[i]); |
329 | c142442b | Kevin Wolf | } |
330 | c142442b | Kevin Wolf | |
331 | ed6ccf0f | Kevin Wolf | if (qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 1) < 0) |
332 | c142442b | Kevin Wolf | goto fail;
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333 | c142442b | Kevin Wolf | |
334 | c142442b | Kevin Wolf | #ifdef DEBUG_ALLOC
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335 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
336 | c142442b | Kevin Wolf | #endif
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337 | c142442b | Kevin Wolf | return 0; |
338 | c142442b | Kevin Wolf | fail:
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339 | c142442b | Kevin Wolf | return -EIO;
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340 | c142442b | Kevin Wolf | } |
341 | c142442b | Kevin Wolf | |
342 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
343 | c142442b | Kevin Wolf | { |
344 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
345 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
346 | c142442b | Kevin Wolf | int snapshot_index, ret;
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347 | c142442b | Kevin Wolf | |
348 | c142442b | Kevin Wolf | snapshot_index = find_snapshot_by_id_or_name(bs, snapshot_id); |
349 | c142442b | Kevin Wolf | if (snapshot_index < 0) |
350 | c142442b | Kevin Wolf | return -ENOENT;
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351 | c142442b | Kevin Wolf | sn = &s->snapshots[snapshot_index]; |
352 | c142442b | Kevin Wolf | |
353 | ed6ccf0f | Kevin Wolf | ret = qcow2_update_snapshot_refcount(bs, sn->l1_table_offset, sn->l1_size, -1);
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354 | c142442b | Kevin Wolf | if (ret < 0) |
355 | c142442b | Kevin Wolf | return ret;
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356 | c142442b | Kevin Wolf | /* must update the copied flag on the current cluster offsets */
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357 | ed6ccf0f | Kevin Wolf | ret = qcow2_update_snapshot_refcount(bs, s->l1_table_offset, s->l1_size, 0);
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358 | c142442b | Kevin Wolf | if (ret < 0) |
359 | c142442b | Kevin Wolf | return ret;
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360 | ed6ccf0f | Kevin Wolf | qcow2_free_clusters(bs, sn->l1_table_offset, sn->l1_size * sizeof(uint64_t));
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361 | c142442b | Kevin Wolf | |
362 | c142442b | Kevin Wolf | qemu_free(sn->id_str); |
363 | c142442b | Kevin Wolf | qemu_free(sn->name); |
364 | c142442b | Kevin Wolf | memmove(sn, sn + 1, (s->nb_snapshots - snapshot_index - 1) * sizeof(*sn)); |
365 | c142442b | Kevin Wolf | s->nb_snapshots--; |
366 | c142442b | Kevin Wolf | ret = qcow_write_snapshots(bs); |
367 | c142442b | Kevin Wolf | if (ret < 0) { |
368 | c142442b | Kevin Wolf | /* XXX: restore snapshot if error ? */
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369 | c142442b | Kevin Wolf | return ret;
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370 | c142442b | Kevin Wolf | } |
371 | c142442b | Kevin Wolf | #ifdef DEBUG_ALLOC
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372 | 14899cdf | Filip Navara | qcow2_check_refcounts(bs); |
373 | c142442b | Kevin Wolf | #endif
|
374 | c142442b | Kevin Wolf | return 0; |
375 | c142442b | Kevin Wolf | } |
376 | c142442b | Kevin Wolf | |
377 | ed6ccf0f | Kevin Wolf | int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab)
|
378 | c142442b | Kevin Wolf | { |
379 | c142442b | Kevin Wolf | BDRVQcowState *s = bs->opaque; |
380 | c142442b | Kevin Wolf | QEMUSnapshotInfo *sn_tab, *sn_info; |
381 | c142442b | Kevin Wolf | QCowSnapshot *sn; |
382 | c142442b | Kevin Wolf | int i;
|
383 | c142442b | Kevin Wolf | |
384 | c142442b | Kevin Wolf | if (!s->nb_snapshots) {
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385 | c142442b | Kevin Wolf | *psn_tab = NULL;
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386 | c142442b | Kevin Wolf | return s->nb_snapshots;
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387 | c142442b | Kevin Wolf | } |
388 | c142442b | Kevin Wolf | |
389 | c142442b | Kevin Wolf | sn_tab = qemu_mallocz(s->nb_snapshots * sizeof(QEMUSnapshotInfo));
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390 | c142442b | Kevin Wolf | for(i = 0; i < s->nb_snapshots; i++) { |
391 | c142442b | Kevin Wolf | sn_info = sn_tab + i; |
392 | c142442b | Kevin Wolf | sn = s->snapshots + i; |
393 | c142442b | Kevin Wolf | pstrcpy(sn_info->id_str, sizeof(sn_info->id_str),
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394 | c142442b | Kevin Wolf | sn->id_str); |
395 | c142442b | Kevin Wolf | pstrcpy(sn_info->name, sizeof(sn_info->name),
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396 | c142442b | Kevin Wolf | sn->name); |
397 | c142442b | Kevin Wolf | sn_info->vm_state_size = sn->vm_state_size; |
398 | c142442b | Kevin Wolf | sn_info->date_sec = sn->date_sec; |
399 | c142442b | Kevin Wolf | sn_info->date_nsec = sn->date_nsec; |
400 | c142442b | Kevin Wolf | sn_info->vm_clock_nsec = sn->vm_clock_nsec; |
401 | c142442b | Kevin Wolf | } |
402 | c142442b | Kevin Wolf | *psn_tab = sn_tab; |
403 | c142442b | Kevin Wolf | return s->nb_snapshots;
|
404 | c142442b | Kevin Wolf | } |