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1 | fc01f7e7 | bellard | /*
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2 | fc01f7e7 | bellard | * QEMU System Emulator block driver
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3 | 5fafdf24 | ths | *
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4 | fc01f7e7 | bellard | * Copyright (c) 2003 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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6 | fc01f7e7 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | fc01f7e7 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | fc01f7e7 | bellard | * in the Software without restriction, including without limitation the rights
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9 | fc01f7e7 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | fc01f7e7 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | fc01f7e7 | bellard | * furnished to do so, subject to the following conditions:
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12 | fc01f7e7 | bellard | *
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13 | fc01f7e7 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | fc01f7e7 | bellard | * all copies or substantial portions of the Software.
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15 | fc01f7e7 | bellard | *
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16 | fc01f7e7 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | fc01f7e7 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | fc01f7e7 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | fc01f7e7 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | fc01f7e7 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | fc01f7e7 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | fc01f7e7 | bellard | * THE SOFTWARE.
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23 | fc01f7e7 | bellard | */
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24 | 3990d09a | blueswir1 | #include "config-host.h" |
25 | faf07963 | pbrook | #include "qemu-common.h" |
26 | 376253ec | aliguori | #include "monitor.h" |
27 | ea2384d3 | bellard | #include "block_int.h" |
28 | 5efa9d5a | Anthony Liguori | #include "module.h" |
29 | d15e5465 | Luiz Capitulino | #include "qemu-objects.h" |
30 | fc01f7e7 | bellard | |
31 | 71e72a19 | Juan Quintela | #ifdef CONFIG_BSD
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32 | 7674e7bf | bellard | #include <sys/types.h> |
33 | 7674e7bf | bellard | #include <sys/stat.h> |
34 | 7674e7bf | bellard | #include <sys/ioctl.h> |
35 | 72cf2d4f | Blue Swirl | #include <sys/queue.h> |
36 | c5e97233 | blueswir1 | #ifndef __DragonFly__
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37 | 7674e7bf | bellard | #include <sys/disk.h> |
38 | 7674e7bf | bellard | #endif
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39 | c5e97233 | blueswir1 | #endif
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40 | 7674e7bf | bellard | |
41 | 49dc768d | aliguori | #ifdef _WIN32
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42 | 49dc768d | aliguori | #include <windows.h> |
43 | 49dc768d | aliguori | #endif
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44 | 49dc768d | aliguori | |
45 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
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46 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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47 | c87c0672 | aliguori | BlockDriverCompletionFunc *cb, void *opaque);
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48 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
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49 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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50 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque);
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51 | b2e12bc6 | Christoph Hellwig | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
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52 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque);
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53 | 016f5cf6 | Alexander Graf | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
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54 | 016f5cf6 | Alexander Graf | BlockDriverCompletionFunc *cb, void *opaque);
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55 | 5fafdf24 | ths | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
56 | 83f64091 | bellard | uint8_t *buf, int nb_sectors);
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57 | 83f64091 | bellard | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
58 | 83f64091 | bellard | const uint8_t *buf, int nb_sectors); |
59 | 84a12e66 | Christoph Hellwig | static BlockDriver *find_protocol(const char *filename); |
60 | ec530c81 | bellard | |
61 | 1b7bdbc1 | Stefan Hajnoczi | static QTAILQ_HEAD(, BlockDriverState) bdrv_states =
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62 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_HEAD_INITIALIZER(bdrv_states); |
63 | 7ee930d0 | blueswir1 | |
64 | 8a22f02a | Stefan Hajnoczi | static QLIST_HEAD(, BlockDriver) bdrv_drivers =
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65 | 8a22f02a | Stefan Hajnoczi | QLIST_HEAD_INITIALIZER(bdrv_drivers); |
66 | ea2384d3 | bellard | |
67 | eb852011 | Markus Armbruster | /* If non-zero, use only whitelisted block drivers */
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68 | eb852011 | Markus Armbruster | static int use_bdrv_whitelist; |
69 | eb852011 | Markus Armbruster | |
70 | 83f64091 | bellard | int path_is_absolute(const char *path) |
71 | 3b0d4f61 | bellard | { |
72 | 83f64091 | bellard | const char *p; |
73 | 21664424 | bellard | #ifdef _WIN32
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74 | 21664424 | bellard | /* specific case for names like: "\\.\d:" */
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75 | 21664424 | bellard | if (*path == '/' || *path == '\\') |
76 | 21664424 | bellard | return 1; |
77 | 21664424 | bellard | #endif
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78 | 83f64091 | bellard | p = strchr(path, ':');
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79 | 83f64091 | bellard | if (p)
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80 | 83f64091 | bellard | p++; |
81 | 83f64091 | bellard | else
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82 | 83f64091 | bellard | p = path; |
83 | 3b9f94e1 | bellard | #ifdef _WIN32
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84 | 3b9f94e1 | bellard | return (*p == '/' || *p == '\\'); |
85 | 3b9f94e1 | bellard | #else
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86 | 3b9f94e1 | bellard | return (*p == '/'); |
87 | 3b9f94e1 | bellard | #endif
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88 | 3b0d4f61 | bellard | } |
89 | 3b0d4f61 | bellard | |
90 | 83f64091 | bellard | /* if filename is absolute, just copy it to dest. Otherwise, build a
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91 | 83f64091 | bellard | path to it by considering it is relative to base_path. URL are
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92 | 83f64091 | bellard | supported. */
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93 | 83f64091 | bellard | void path_combine(char *dest, int dest_size, |
94 | 83f64091 | bellard | const char *base_path, |
95 | 83f64091 | bellard | const char *filename) |
96 | 3b0d4f61 | bellard | { |
97 | 83f64091 | bellard | const char *p, *p1; |
98 | 83f64091 | bellard | int len;
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99 | 83f64091 | bellard | |
100 | 83f64091 | bellard | if (dest_size <= 0) |
101 | 83f64091 | bellard | return;
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102 | 83f64091 | bellard | if (path_is_absolute(filename)) {
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103 | 83f64091 | bellard | pstrcpy(dest, dest_size, filename); |
104 | 83f64091 | bellard | } else {
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105 | 83f64091 | bellard | p = strchr(base_path, ':');
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106 | 83f64091 | bellard | if (p)
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107 | 83f64091 | bellard | p++; |
108 | 83f64091 | bellard | else
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109 | 83f64091 | bellard | p = base_path; |
110 | 3b9f94e1 | bellard | p1 = strrchr(base_path, '/');
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111 | 3b9f94e1 | bellard | #ifdef _WIN32
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112 | 3b9f94e1 | bellard | { |
113 | 3b9f94e1 | bellard | const char *p2; |
114 | 3b9f94e1 | bellard | p2 = strrchr(base_path, '\\');
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115 | 3b9f94e1 | bellard | if (!p1 || p2 > p1)
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116 | 3b9f94e1 | bellard | p1 = p2; |
117 | 3b9f94e1 | bellard | } |
118 | 3b9f94e1 | bellard | #endif
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119 | 83f64091 | bellard | if (p1)
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120 | 83f64091 | bellard | p1++; |
121 | 83f64091 | bellard | else
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122 | 83f64091 | bellard | p1 = base_path; |
123 | 83f64091 | bellard | if (p1 > p)
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124 | 83f64091 | bellard | p = p1; |
125 | 83f64091 | bellard | len = p - base_path; |
126 | 83f64091 | bellard | if (len > dest_size - 1) |
127 | 83f64091 | bellard | len = dest_size - 1;
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128 | 83f64091 | bellard | memcpy(dest, base_path, len); |
129 | 83f64091 | bellard | dest[len] = '\0';
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130 | 83f64091 | bellard | pstrcat(dest, dest_size, filename); |
131 | 3b0d4f61 | bellard | } |
132 | 3b0d4f61 | bellard | } |
133 | 3b0d4f61 | bellard | |
134 | 5efa9d5a | Anthony Liguori | void bdrv_register(BlockDriver *bdrv)
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135 | ea2384d3 | bellard | { |
136 | f141eafe | aliguori | if (!bdrv->bdrv_aio_readv) {
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137 | 83f64091 | bellard | /* add AIO emulation layer */
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138 | f141eafe | aliguori | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
139 | f141eafe | aliguori | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
140 | eda578e5 | aliguori | } else if (!bdrv->bdrv_read) { |
141 | 83f64091 | bellard | /* add synchronous IO emulation layer */
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142 | 83f64091 | bellard | bdrv->bdrv_read = bdrv_read_em; |
143 | 83f64091 | bellard | bdrv->bdrv_write = bdrv_write_em; |
144 | 83f64091 | bellard | } |
145 | b2e12bc6 | Christoph Hellwig | |
146 | b2e12bc6 | Christoph Hellwig | if (!bdrv->bdrv_aio_flush)
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147 | b2e12bc6 | Christoph Hellwig | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
148 | b2e12bc6 | Christoph Hellwig | |
149 | 8a22f02a | Stefan Hajnoczi | QLIST_INSERT_HEAD(&bdrv_drivers, bdrv, list); |
150 | ea2384d3 | bellard | } |
151 | b338082b | bellard | |
152 | b338082b | bellard | /* create a new block device (by default it is empty) */
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153 | b338082b | bellard | BlockDriverState *bdrv_new(const char *device_name) |
154 | b338082b | bellard | { |
155 | 1b7bdbc1 | Stefan Hajnoczi | BlockDriverState *bs; |
156 | b338082b | bellard | |
157 | b338082b | bellard | bs = qemu_mallocz(sizeof(BlockDriverState));
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158 | b338082b | bellard | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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159 | ea2384d3 | bellard | if (device_name[0] != '\0') { |
160 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_INSERT_TAIL(&bdrv_states, bs, list); |
161 | ea2384d3 | bellard | } |
162 | b338082b | bellard | return bs;
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163 | b338082b | bellard | } |
164 | b338082b | bellard | |
165 | ea2384d3 | bellard | BlockDriver *bdrv_find_format(const char *format_name) |
166 | ea2384d3 | bellard | { |
167 | ea2384d3 | bellard | BlockDriver *drv1; |
168 | 8a22f02a | Stefan Hajnoczi | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
169 | 8a22f02a | Stefan Hajnoczi | if (!strcmp(drv1->format_name, format_name)) {
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170 | ea2384d3 | bellard | return drv1;
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171 | 8a22f02a | Stefan Hajnoczi | } |
172 | ea2384d3 | bellard | } |
173 | ea2384d3 | bellard | return NULL; |
174 | ea2384d3 | bellard | } |
175 | ea2384d3 | bellard | |
176 | eb852011 | Markus Armbruster | static int bdrv_is_whitelisted(BlockDriver *drv) |
177 | eb852011 | Markus Armbruster | { |
178 | eb852011 | Markus Armbruster | static const char *whitelist[] = { |
179 | eb852011 | Markus Armbruster | CONFIG_BDRV_WHITELIST |
180 | eb852011 | Markus Armbruster | }; |
181 | eb852011 | Markus Armbruster | const char **p; |
182 | eb852011 | Markus Armbruster | |
183 | eb852011 | Markus Armbruster | if (!whitelist[0]) |
184 | eb852011 | Markus Armbruster | return 1; /* no whitelist, anything goes */ |
185 | eb852011 | Markus Armbruster | |
186 | eb852011 | Markus Armbruster | for (p = whitelist; *p; p++) {
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187 | eb852011 | Markus Armbruster | if (!strcmp(drv->format_name, *p)) {
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188 | eb852011 | Markus Armbruster | return 1; |
189 | eb852011 | Markus Armbruster | } |
190 | eb852011 | Markus Armbruster | } |
191 | eb852011 | Markus Armbruster | return 0; |
192 | eb852011 | Markus Armbruster | } |
193 | eb852011 | Markus Armbruster | |
194 | eb852011 | Markus Armbruster | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
195 | eb852011 | Markus Armbruster | { |
196 | eb852011 | Markus Armbruster | BlockDriver *drv = bdrv_find_format(format_name); |
197 | eb852011 | Markus Armbruster | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
198 | eb852011 | Markus Armbruster | } |
199 | eb852011 | Markus Armbruster | |
200 | 0e7e1989 | Kevin Wolf | int bdrv_create(BlockDriver *drv, const char* filename, |
201 | 0e7e1989 | Kevin Wolf | QEMUOptionParameter *options) |
202 | ea2384d3 | bellard | { |
203 | ea2384d3 | bellard | if (!drv->bdrv_create)
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204 | ea2384d3 | bellard | return -ENOTSUP;
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205 | 0e7e1989 | Kevin Wolf | |
206 | 0e7e1989 | Kevin Wolf | return drv->bdrv_create(filename, options);
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207 | ea2384d3 | bellard | } |
208 | ea2384d3 | bellard | |
209 | 84a12e66 | Christoph Hellwig | int bdrv_create_file(const char* filename, QEMUOptionParameter *options) |
210 | 84a12e66 | Christoph Hellwig | { |
211 | 84a12e66 | Christoph Hellwig | BlockDriver *drv; |
212 | 84a12e66 | Christoph Hellwig | |
213 | 84a12e66 | Christoph Hellwig | drv = find_protocol(filename); |
214 | 84a12e66 | Christoph Hellwig | if (drv == NULL) { |
215 | 84a12e66 | Christoph Hellwig | drv = bdrv_find_format("file");
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216 | 84a12e66 | Christoph Hellwig | } |
217 | 84a12e66 | Christoph Hellwig | |
218 | 84a12e66 | Christoph Hellwig | return bdrv_create(drv, filename, options);
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219 | 84a12e66 | Christoph Hellwig | } |
220 | 84a12e66 | Christoph Hellwig | |
221 | d5249393 | bellard | #ifdef _WIN32
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222 | 95389c86 | bellard | void get_tmp_filename(char *filename, int size) |
223 | d5249393 | bellard | { |
224 | 3b9f94e1 | bellard | char temp_dir[MAX_PATH];
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225 | 3b46e624 | ths | |
226 | 3b9f94e1 | bellard | GetTempPath(MAX_PATH, temp_dir); |
227 | 3b9f94e1 | bellard | GetTempFileName(temp_dir, "qem", 0, filename); |
228 | d5249393 | bellard | } |
229 | d5249393 | bellard | #else
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230 | 95389c86 | bellard | void get_tmp_filename(char *filename, int size) |
231 | fc01f7e7 | bellard | { |
232 | 67b915a5 | bellard | int fd;
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233 | 7ccfb2eb | blueswir1 | const char *tmpdir; |
234 | d5249393 | bellard | /* XXX: race condition possible */
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235 | 0badc1ee | aurel32 | tmpdir = getenv("TMPDIR");
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236 | 0badc1ee | aurel32 | if (!tmpdir)
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237 | 0badc1ee | aurel32 | tmpdir = "/tmp";
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238 | 0badc1ee | aurel32 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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239 | ea2384d3 | bellard | fd = mkstemp(filename); |
240 | ea2384d3 | bellard | close(fd); |
241 | ea2384d3 | bellard | } |
242 | d5249393 | bellard | #endif
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243 | fc01f7e7 | bellard | |
244 | 19cb3738 | bellard | #ifdef _WIN32
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245 | f45512fe | bellard | static int is_windows_drive_prefix(const char *filename) |
246 | f45512fe | bellard | { |
247 | f45512fe | bellard | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
248 | f45512fe | bellard | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
249 | f45512fe | bellard | filename[1] == ':'); |
250 | f45512fe | bellard | } |
251 | 3b46e624 | ths | |
252 | 508c7cb3 | Christoph Hellwig | int is_windows_drive(const char *filename) |
253 | 19cb3738 | bellard | { |
254 | 5fafdf24 | ths | if (is_windows_drive_prefix(filename) &&
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255 | f45512fe | bellard | filename[2] == '\0') |
256 | 19cb3738 | bellard | return 1; |
257 | 19cb3738 | bellard | if (strstart(filename, "\\\\.\\", NULL) || |
258 | 19cb3738 | bellard | strstart(filename, "//./", NULL)) |
259 | 19cb3738 | bellard | return 1; |
260 | 19cb3738 | bellard | return 0; |
261 | 19cb3738 | bellard | } |
262 | 19cb3738 | bellard | #endif
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263 | 19cb3738 | bellard | |
264 | 84a12e66 | Christoph Hellwig | /*
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265 | 84a12e66 | Christoph Hellwig | * Detect host devices. By convention, /dev/cdrom[N] is always
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266 | 84a12e66 | Christoph Hellwig | * recognized as a host CDROM.
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267 | 84a12e66 | Christoph Hellwig | */
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268 | 84a12e66 | Christoph Hellwig | static BlockDriver *find_hdev_driver(const char *filename) |
269 | 84a12e66 | Christoph Hellwig | { |
270 | 84a12e66 | Christoph Hellwig | int score_max = 0, score; |
271 | 84a12e66 | Christoph Hellwig | BlockDriver *drv = NULL, *d;
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272 | 84a12e66 | Christoph Hellwig | |
273 | 84a12e66 | Christoph Hellwig | QLIST_FOREACH(d, &bdrv_drivers, list) { |
274 | 84a12e66 | Christoph Hellwig | if (d->bdrv_probe_device) {
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275 | 84a12e66 | Christoph Hellwig | score = d->bdrv_probe_device(filename); |
276 | 84a12e66 | Christoph Hellwig | if (score > score_max) {
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277 | 84a12e66 | Christoph Hellwig | score_max = score; |
278 | 84a12e66 | Christoph Hellwig | drv = d; |
279 | 84a12e66 | Christoph Hellwig | } |
280 | 84a12e66 | Christoph Hellwig | } |
281 | 84a12e66 | Christoph Hellwig | } |
282 | 84a12e66 | Christoph Hellwig | |
283 | 84a12e66 | Christoph Hellwig | return drv;
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284 | 84a12e66 | Christoph Hellwig | } |
285 | 84a12e66 | Christoph Hellwig | |
286 | 83f64091 | bellard | static BlockDriver *find_protocol(const char *filename) |
287 | 83f64091 | bellard | { |
288 | 83f64091 | bellard | BlockDriver *drv1; |
289 | 83f64091 | bellard | char protocol[128]; |
290 | 1cec71e3 | Anthony Liguori | int len;
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291 | 83f64091 | bellard | const char *p; |
292 | 20993081 | Kevin Wolf | int is_drive;
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293 | 19cb3738 | bellard | |
294 | 66f82cee | Kevin Wolf | /* TODO Drivers without bdrv_file_open must be specified explicitly */
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295 | 66f82cee | Kevin Wolf | |
296 | 19cb3738 | bellard | #ifdef _WIN32
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297 | 20993081 | Kevin Wolf | is_drive = is_windows_drive(filename) || |
298 | 20993081 | Kevin Wolf | is_windows_drive_prefix(filename); |
299 | 20993081 | Kevin Wolf | #else
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300 | 20993081 | Kevin Wolf | is_drive = 0;
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301 | 19cb3738 | bellard | #endif
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302 | 1cec71e3 | Anthony Liguori | p = strchr(filename, ':');
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303 | 20993081 | Kevin Wolf | if (!p || is_drive) {
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304 | 84a12e66 | Christoph Hellwig | drv1 = find_hdev_driver(filename); |
305 | 84a12e66 | Christoph Hellwig | if (!drv1) {
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306 | 84a12e66 | Christoph Hellwig | drv1 = bdrv_find_format("file");
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307 | 84a12e66 | Christoph Hellwig | } |
308 | 84a12e66 | Christoph Hellwig | return drv1;
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309 | 84a12e66 | Christoph Hellwig | } |
310 | 1cec71e3 | Anthony Liguori | len = p - filename; |
311 | 1cec71e3 | Anthony Liguori | if (len > sizeof(protocol) - 1) |
312 | 1cec71e3 | Anthony Liguori | len = sizeof(protocol) - 1; |
313 | 1cec71e3 | Anthony Liguori | memcpy(protocol, filename, len); |
314 | 1cec71e3 | Anthony Liguori | protocol[len] = '\0';
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315 | 8a22f02a | Stefan Hajnoczi | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
316 | 5fafdf24 | ths | if (drv1->protocol_name &&
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317 | 8a22f02a | Stefan Hajnoczi | !strcmp(drv1->protocol_name, protocol)) { |
318 | 83f64091 | bellard | return drv1;
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319 | 8a22f02a | Stefan Hajnoczi | } |
320 | 83f64091 | bellard | } |
321 | 83f64091 | bellard | return NULL; |
322 | 83f64091 | bellard | } |
323 | 83f64091 | bellard | |
324 | f3a5d3f8 | Christoph Hellwig | static BlockDriver *find_image_format(const char *filename) |
325 | f3a5d3f8 | Christoph Hellwig | { |
326 | f3a5d3f8 | Christoph Hellwig | int ret, score, score_max;
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327 | f3a5d3f8 | Christoph Hellwig | BlockDriver *drv1, *drv; |
328 | f3a5d3f8 | Christoph Hellwig | uint8_t buf[2048];
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329 | f3a5d3f8 | Christoph Hellwig | BlockDriverState *bs; |
330 | f3a5d3f8 | Christoph Hellwig | |
331 | f5edb014 | Naphtali Sprei | ret = bdrv_file_open(&bs, filename, 0);
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332 | 83f64091 | bellard | if (ret < 0) |
333 | 83f64091 | bellard | return NULL; |
334 | f8ea0b00 | Nicholas Bellinger | |
335 | f8ea0b00 | Nicholas Bellinger | /* Return the raw BlockDriver * to scsi-generic devices */
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336 | f8ea0b00 | Nicholas Bellinger | if (bs->sg)
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337 | f8ea0b00 | Nicholas Bellinger | return bdrv_find_format("raw"); |
338 | f8ea0b00 | Nicholas Bellinger | |
339 | 83f64091 | bellard | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
340 | 83f64091 | bellard | bdrv_delete(bs); |
341 | 83f64091 | bellard | if (ret < 0) { |
342 | 83f64091 | bellard | return NULL; |
343 | 83f64091 | bellard | } |
344 | 83f64091 | bellard | |
345 | ea2384d3 | bellard | score_max = 0;
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346 | 84a12e66 | Christoph Hellwig | drv = NULL;
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347 | 8a22f02a | Stefan Hajnoczi | QLIST_FOREACH(drv1, &bdrv_drivers, list) { |
348 | 83f64091 | bellard | if (drv1->bdrv_probe) {
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349 | 83f64091 | bellard | score = drv1->bdrv_probe(buf, ret, filename); |
350 | 83f64091 | bellard | if (score > score_max) {
|
351 | 83f64091 | bellard | score_max = score; |
352 | 83f64091 | bellard | drv = drv1; |
353 | 83f64091 | bellard | } |
354 | 0849bf08 | bellard | } |
355 | fc01f7e7 | bellard | } |
356 | ea2384d3 | bellard | return drv;
|
357 | ea2384d3 | bellard | } |
358 | ea2384d3 | bellard | |
359 | 51762288 | Stefan Hajnoczi | /**
|
360 | 51762288 | Stefan Hajnoczi | * Set the current 'total_sectors' value
|
361 | 51762288 | Stefan Hajnoczi | */
|
362 | 51762288 | Stefan Hajnoczi | static int refresh_total_sectors(BlockDriverState *bs, int64_t hint) |
363 | 51762288 | Stefan Hajnoczi | { |
364 | 51762288 | Stefan Hajnoczi | BlockDriver *drv = bs->drv; |
365 | 51762288 | Stefan Hajnoczi | |
366 | 396759ad | Nicholas Bellinger | /* Do not attempt drv->bdrv_getlength() on scsi-generic devices */
|
367 | 396759ad | Nicholas Bellinger | if (bs->sg)
|
368 | 396759ad | Nicholas Bellinger | return 0; |
369 | 396759ad | Nicholas Bellinger | |
370 | 51762288 | Stefan Hajnoczi | /* query actual device if possible, otherwise just trust the hint */
|
371 | 51762288 | Stefan Hajnoczi | if (drv->bdrv_getlength) {
|
372 | 51762288 | Stefan Hajnoczi | int64_t length = drv->bdrv_getlength(bs); |
373 | 51762288 | Stefan Hajnoczi | if (length < 0) { |
374 | 51762288 | Stefan Hajnoczi | return length;
|
375 | 51762288 | Stefan Hajnoczi | } |
376 | 51762288 | Stefan Hajnoczi | hint = length >> BDRV_SECTOR_BITS; |
377 | 51762288 | Stefan Hajnoczi | } |
378 | 51762288 | Stefan Hajnoczi | |
379 | 51762288 | Stefan Hajnoczi | bs->total_sectors = hint; |
380 | 51762288 | Stefan Hajnoczi | return 0; |
381 | 51762288 | Stefan Hajnoczi | } |
382 | 51762288 | Stefan Hajnoczi | |
383 | b6ce07aa | Kevin Wolf | /*
|
384 | 57915332 | Kevin Wolf | * Common part for opening disk images and files
|
385 | 57915332 | Kevin Wolf | */
|
386 | 57915332 | Kevin Wolf | static int bdrv_open_common(BlockDriverState *bs, const char *filename, |
387 | 57915332 | Kevin Wolf | int flags, BlockDriver *drv)
|
388 | 57915332 | Kevin Wolf | { |
389 | 57915332 | Kevin Wolf | int ret, open_flags;
|
390 | 57915332 | Kevin Wolf | |
391 | 57915332 | Kevin Wolf | assert(drv != NULL);
|
392 | 57915332 | Kevin Wolf | |
393 | 66f82cee | Kevin Wolf | bs->file = NULL;
|
394 | 51762288 | Stefan Hajnoczi | bs->total_sectors = 0;
|
395 | 57915332 | Kevin Wolf | bs->is_temporary = 0;
|
396 | 57915332 | Kevin Wolf | bs->encrypted = 0;
|
397 | 57915332 | Kevin Wolf | bs->valid_key = 0;
|
398 | 57915332 | Kevin Wolf | bs->open_flags = flags; |
399 | 57915332 | Kevin Wolf | /* buffer_alignment defaulted to 512, drivers can change this value */
|
400 | 57915332 | Kevin Wolf | bs->buffer_alignment = 512;
|
401 | 57915332 | Kevin Wolf | |
402 | 57915332 | Kevin Wolf | pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
403 | 57915332 | Kevin Wolf | |
404 | 57915332 | Kevin Wolf | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv)) {
|
405 | 57915332 | Kevin Wolf | return -ENOTSUP;
|
406 | 57915332 | Kevin Wolf | } |
407 | 57915332 | Kevin Wolf | |
408 | 57915332 | Kevin Wolf | bs->drv = drv; |
409 | 57915332 | Kevin Wolf | bs->opaque = qemu_mallocz(drv->instance_size); |
410 | 57915332 | Kevin Wolf | |
411 | 57915332 | Kevin Wolf | /*
|
412 | 57915332 | Kevin Wolf | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
413 | 57915332 | Kevin Wolf | * write cache to the guest. We do need the fdatasync to flush
|
414 | 57915332 | Kevin Wolf | * out transactions for block allocations, and we maybe have a
|
415 | 57915332 | Kevin Wolf | * volatile write cache in our backing device to deal with.
|
416 | 57915332 | Kevin Wolf | */
|
417 | 57915332 | Kevin Wolf | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
418 | 57915332 | Kevin Wolf | bs->enable_write_cache = 1;
|
419 | 57915332 | Kevin Wolf | |
420 | 57915332 | Kevin Wolf | /*
|
421 | 57915332 | Kevin Wolf | * Clear flags that are internal to the block layer before opening the
|
422 | 57915332 | Kevin Wolf | * image.
|
423 | 57915332 | Kevin Wolf | */
|
424 | 57915332 | Kevin Wolf | open_flags = flags & ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
425 | 57915332 | Kevin Wolf | |
426 | 57915332 | Kevin Wolf | /*
|
427 | 57915332 | Kevin Wolf | * Snapshots should be writeable.
|
428 | 57915332 | Kevin Wolf | */
|
429 | 57915332 | Kevin Wolf | if (bs->is_temporary) {
|
430 | 57915332 | Kevin Wolf | open_flags |= BDRV_O_RDWR; |
431 | 57915332 | Kevin Wolf | } |
432 | 57915332 | Kevin Wolf | |
433 | 66f82cee | Kevin Wolf | /* Open the image, either directly or using a protocol */
|
434 | 66f82cee | Kevin Wolf | if (drv->bdrv_file_open) {
|
435 | 66f82cee | Kevin Wolf | ret = drv->bdrv_file_open(bs, filename, open_flags); |
436 | 66f82cee | Kevin Wolf | } else {
|
437 | 66f82cee | Kevin Wolf | ret = bdrv_file_open(&bs->file, filename, open_flags); |
438 | 66f82cee | Kevin Wolf | if (ret >= 0) { |
439 | 66f82cee | Kevin Wolf | ret = drv->bdrv_open(bs, open_flags); |
440 | 66f82cee | Kevin Wolf | } |
441 | 66f82cee | Kevin Wolf | } |
442 | 66f82cee | Kevin Wolf | |
443 | 57915332 | Kevin Wolf | if (ret < 0) { |
444 | 57915332 | Kevin Wolf | goto free_and_fail;
|
445 | 57915332 | Kevin Wolf | } |
446 | 57915332 | Kevin Wolf | |
447 | 57915332 | Kevin Wolf | bs->keep_read_only = bs->read_only = !(open_flags & BDRV_O_RDWR); |
448 | 51762288 | Stefan Hajnoczi | |
449 | 51762288 | Stefan Hajnoczi | ret = refresh_total_sectors(bs, bs->total_sectors); |
450 | 51762288 | Stefan Hajnoczi | if (ret < 0) { |
451 | 51762288 | Stefan Hajnoczi | goto free_and_fail;
|
452 | 57915332 | Kevin Wolf | } |
453 | 51762288 | Stefan Hajnoczi | |
454 | 57915332 | Kevin Wolf | #ifndef _WIN32
|
455 | 57915332 | Kevin Wolf | if (bs->is_temporary) {
|
456 | 57915332 | Kevin Wolf | unlink(filename); |
457 | 57915332 | Kevin Wolf | } |
458 | 57915332 | Kevin Wolf | #endif
|
459 | 57915332 | Kevin Wolf | return 0; |
460 | 57915332 | Kevin Wolf | |
461 | 57915332 | Kevin Wolf | free_and_fail:
|
462 | 66f82cee | Kevin Wolf | if (bs->file) {
|
463 | 66f82cee | Kevin Wolf | bdrv_delete(bs->file); |
464 | 66f82cee | Kevin Wolf | bs->file = NULL;
|
465 | 66f82cee | Kevin Wolf | } |
466 | 57915332 | Kevin Wolf | qemu_free(bs->opaque); |
467 | 57915332 | Kevin Wolf | bs->opaque = NULL;
|
468 | 57915332 | Kevin Wolf | bs->drv = NULL;
|
469 | 57915332 | Kevin Wolf | return ret;
|
470 | 57915332 | Kevin Wolf | } |
471 | 57915332 | Kevin Wolf | |
472 | 57915332 | Kevin Wolf | /*
|
473 | b6ce07aa | Kevin Wolf | * Opens a file using a protocol (file, host_device, nbd, ...)
|
474 | b6ce07aa | Kevin Wolf | */
|
475 | 83f64091 | bellard | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
476 | ea2384d3 | bellard | { |
477 | 83f64091 | bellard | BlockDriverState *bs; |
478 | 6db95603 | Christoph Hellwig | BlockDriver *drv; |
479 | 83f64091 | bellard | int ret;
|
480 | 83f64091 | bellard | |
481 | 6db95603 | Christoph Hellwig | drv = find_protocol(filename); |
482 | 6db95603 | Christoph Hellwig | if (!drv) {
|
483 | 6db95603 | Christoph Hellwig | return -ENOENT;
|
484 | 6db95603 | Christoph Hellwig | } |
485 | 6db95603 | Christoph Hellwig | |
486 | 83f64091 | bellard | bs = bdrv_new("");
|
487 | b6ce07aa | Kevin Wolf | ret = bdrv_open_common(bs, filename, flags, drv); |
488 | 83f64091 | bellard | if (ret < 0) { |
489 | 83f64091 | bellard | bdrv_delete(bs); |
490 | 83f64091 | bellard | return ret;
|
491 | 3b0d4f61 | bellard | } |
492 | 71d0770c | aliguori | bs->growable = 1;
|
493 | 83f64091 | bellard | *pbs = bs; |
494 | 83f64091 | bellard | return 0; |
495 | 83f64091 | bellard | } |
496 | 83f64091 | bellard | |
497 | b6ce07aa | Kevin Wolf | /*
|
498 | b6ce07aa | Kevin Wolf | * Opens a disk image (raw, qcow2, vmdk, ...)
|
499 | b6ce07aa | Kevin Wolf | */
|
500 | d6e9098e | Kevin Wolf | int bdrv_open(BlockDriverState *bs, const char *filename, int flags, |
501 | d6e9098e | Kevin Wolf | BlockDriver *drv) |
502 | ea2384d3 | bellard | { |
503 | b6ce07aa | Kevin Wolf | int ret;
|
504 | 712e7874 | bellard | |
505 | 83f64091 | bellard | if (flags & BDRV_O_SNAPSHOT) {
|
506 | ea2384d3 | bellard | BlockDriverState *bs1; |
507 | ea2384d3 | bellard | int64_t total_size; |
508 | 7c96d46e | aliguori | int is_protocol = 0; |
509 | 91a073a9 | Kevin Wolf | BlockDriver *bdrv_qcow2; |
510 | 91a073a9 | Kevin Wolf | QEMUOptionParameter *options; |
511 | b6ce07aa | Kevin Wolf | char tmp_filename[PATH_MAX];
|
512 | b6ce07aa | Kevin Wolf | char backing_filename[PATH_MAX];
|
513 | 3b46e624 | ths | |
514 | ea2384d3 | bellard | /* if snapshot, we create a temporary backing file and open it
|
515 | ea2384d3 | bellard | instead of opening 'filename' directly */
|
516 | 33e3963e | bellard | |
517 | ea2384d3 | bellard | /* if there is a backing file, use it */
|
518 | ea2384d3 | bellard | bs1 = bdrv_new("");
|
519 | d6e9098e | Kevin Wolf | ret = bdrv_open(bs1, filename, 0, drv);
|
520 | 51d7c00c | aliguori | if (ret < 0) { |
521 | ea2384d3 | bellard | bdrv_delete(bs1); |
522 | 51d7c00c | aliguori | return ret;
|
523 | ea2384d3 | bellard | } |
524 | 6ea44308 | Jan Kiszka | total_size = bdrv_getlength(bs1) >> BDRV_SECTOR_BITS; |
525 | 7c96d46e | aliguori | |
526 | 7c96d46e | aliguori | if (bs1->drv && bs1->drv->protocol_name)
|
527 | 7c96d46e | aliguori | is_protocol = 1;
|
528 | 7c96d46e | aliguori | |
529 | ea2384d3 | bellard | bdrv_delete(bs1); |
530 | 3b46e624 | ths | |
531 | ea2384d3 | bellard | get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
532 | 7c96d46e | aliguori | |
533 | 7c96d46e | aliguori | /* Real path is meaningless for protocols */
|
534 | 7c96d46e | aliguori | if (is_protocol)
|
535 | 7c96d46e | aliguori | snprintf(backing_filename, sizeof(backing_filename),
|
536 | 7c96d46e | aliguori | "%s", filename);
|
537 | 114cdfa9 | Kirill A. Shutemov | else if (!realpath(filename, backing_filename)) |
538 | 114cdfa9 | Kirill A. Shutemov | return -errno;
|
539 | 7c96d46e | aliguori | |
540 | 91a073a9 | Kevin Wolf | bdrv_qcow2 = bdrv_find_format("qcow2");
|
541 | 91a073a9 | Kevin Wolf | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
542 | 91a073a9 | Kevin Wolf | |
543 | 91a073a9 | Kevin Wolf | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
544 | 91a073a9 | Kevin Wolf | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
545 | 91a073a9 | Kevin Wolf | if (drv) {
|
546 | 91a073a9 | Kevin Wolf | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
547 | 91a073a9 | Kevin Wolf | drv->format_name); |
548 | 91a073a9 | Kevin Wolf | } |
549 | 91a073a9 | Kevin Wolf | |
550 | 91a073a9 | Kevin Wolf | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
551 | d748768c | Jan Kiszka | free_option_parameters(options); |
552 | 51d7c00c | aliguori | if (ret < 0) { |
553 | 51d7c00c | aliguori | return ret;
|
554 | ea2384d3 | bellard | } |
555 | 91a073a9 | Kevin Wolf | |
556 | ea2384d3 | bellard | filename = tmp_filename; |
557 | 91a073a9 | Kevin Wolf | drv = bdrv_qcow2; |
558 | ea2384d3 | bellard | bs->is_temporary = 1;
|
559 | ea2384d3 | bellard | } |
560 | 712e7874 | bellard | |
561 | b6ce07aa | Kevin Wolf | /* Find the right image format driver */
|
562 | 6db95603 | Christoph Hellwig | if (!drv) {
|
563 | 84a12e66 | Christoph Hellwig | drv = find_image_format(filename); |
564 | 51d7c00c | aliguori | } |
565 | 6987307c | Christoph Hellwig | |
566 | 51d7c00c | aliguori | if (!drv) {
|
567 | 51d7c00c | aliguori | ret = -ENOENT; |
568 | 51d7c00c | aliguori | goto unlink_and_fail;
|
569 | ea2384d3 | bellard | } |
570 | b6ce07aa | Kevin Wolf | |
571 | b6ce07aa | Kevin Wolf | /* Open the image */
|
572 | b6ce07aa | Kevin Wolf | ret = bdrv_open_common(bs, filename, flags, drv); |
573 | b6ce07aa | Kevin Wolf | if (ret < 0) { |
574 | 6987307c | Christoph Hellwig | goto unlink_and_fail;
|
575 | 6987307c | Christoph Hellwig | } |
576 | 6987307c | Christoph Hellwig | |
577 | b6ce07aa | Kevin Wolf | /* If there is a backing file, use it */
|
578 | b6ce07aa | Kevin Wolf | if ((flags & BDRV_O_NO_BACKING) == 0 && bs->backing_file[0] != '\0') { |
579 | b6ce07aa | Kevin Wolf | char backing_filename[PATH_MAX];
|
580 | b6ce07aa | Kevin Wolf | int back_flags;
|
581 | b6ce07aa | Kevin Wolf | BlockDriver *back_drv = NULL;
|
582 | b6ce07aa | Kevin Wolf | |
583 | b6ce07aa | Kevin Wolf | bs->backing_hd = bdrv_new("");
|
584 | b6ce07aa | Kevin Wolf | path_combine(backing_filename, sizeof(backing_filename),
|
585 | b6ce07aa | Kevin Wolf | filename, bs->backing_file); |
586 | b6ce07aa | Kevin Wolf | if (bs->backing_format[0] != '\0') |
587 | b6ce07aa | Kevin Wolf | back_drv = bdrv_find_format(bs->backing_format); |
588 | b6ce07aa | Kevin Wolf | |
589 | b6ce07aa | Kevin Wolf | /* backing files always opened read-only */
|
590 | b6ce07aa | Kevin Wolf | back_flags = |
591 | b6ce07aa | Kevin Wolf | flags & ~(BDRV_O_RDWR | BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING); |
592 | b6ce07aa | Kevin Wolf | |
593 | b6ce07aa | Kevin Wolf | ret = bdrv_open(bs->backing_hd, backing_filename, back_flags, back_drv); |
594 | b6ce07aa | Kevin Wolf | if (ret < 0) { |
595 | b6ce07aa | Kevin Wolf | bdrv_close(bs); |
596 | b6ce07aa | Kevin Wolf | return ret;
|
597 | b6ce07aa | Kevin Wolf | } |
598 | b6ce07aa | Kevin Wolf | if (bs->is_temporary) {
|
599 | b6ce07aa | Kevin Wolf | bs->backing_hd->keep_read_only = !(flags & BDRV_O_RDWR); |
600 | b6ce07aa | Kevin Wolf | } else {
|
601 | b6ce07aa | Kevin Wolf | /* base image inherits from "parent" */
|
602 | b6ce07aa | Kevin Wolf | bs->backing_hd->keep_read_only = bs->keep_read_only; |
603 | b6ce07aa | Kevin Wolf | } |
604 | b6ce07aa | Kevin Wolf | } |
605 | b6ce07aa | Kevin Wolf | |
606 | b6ce07aa | Kevin Wolf | if (!bdrv_key_required(bs)) {
|
607 | b6ce07aa | Kevin Wolf | /* call the change callback */
|
608 | b6ce07aa | Kevin Wolf | bs->media_changed = 1;
|
609 | b6ce07aa | Kevin Wolf | if (bs->change_cb)
|
610 | b6ce07aa | Kevin Wolf | bs->change_cb(bs->change_opaque); |
611 | b6ce07aa | Kevin Wolf | } |
612 | b6ce07aa | Kevin Wolf | |
613 | b6ce07aa | Kevin Wolf | return 0; |
614 | b6ce07aa | Kevin Wolf | |
615 | b6ce07aa | Kevin Wolf | unlink_and_fail:
|
616 | b6ce07aa | Kevin Wolf | if (bs->is_temporary) {
|
617 | b6ce07aa | Kevin Wolf | unlink(filename); |
618 | b6ce07aa | Kevin Wolf | } |
619 | b6ce07aa | Kevin Wolf | return ret;
|
620 | b6ce07aa | Kevin Wolf | } |
621 | b6ce07aa | Kevin Wolf | |
622 | fc01f7e7 | bellard | void bdrv_close(BlockDriverState *bs)
|
623 | fc01f7e7 | bellard | { |
624 | 19cb3738 | bellard | if (bs->drv) {
|
625 | 557df6ac | Stefan Hajnoczi | if (bs->backing_hd) {
|
626 | ea2384d3 | bellard | bdrv_delete(bs->backing_hd); |
627 | 557df6ac | Stefan Hajnoczi | bs->backing_hd = NULL;
|
628 | 557df6ac | Stefan Hajnoczi | } |
629 | ea2384d3 | bellard | bs->drv->bdrv_close(bs); |
630 | ea2384d3 | bellard | qemu_free(bs->opaque); |
631 | ea2384d3 | bellard | #ifdef _WIN32
|
632 | ea2384d3 | bellard | if (bs->is_temporary) {
|
633 | ea2384d3 | bellard | unlink(bs->filename); |
634 | ea2384d3 | bellard | } |
635 | 67b915a5 | bellard | #endif
|
636 | ea2384d3 | bellard | bs->opaque = NULL;
|
637 | ea2384d3 | bellard | bs->drv = NULL;
|
638 | b338082b | bellard | |
639 | 66f82cee | Kevin Wolf | if (bs->file != NULL) { |
640 | 66f82cee | Kevin Wolf | bdrv_close(bs->file); |
641 | 66f82cee | Kevin Wolf | } |
642 | 66f82cee | Kevin Wolf | |
643 | b338082b | bellard | /* call the change callback */
|
644 | 19cb3738 | bellard | bs->media_changed = 1;
|
645 | b338082b | bellard | if (bs->change_cb)
|
646 | b338082b | bellard | bs->change_cb(bs->change_opaque); |
647 | b338082b | bellard | } |
648 | b338082b | bellard | } |
649 | b338082b | bellard | |
650 | b338082b | bellard | void bdrv_delete(BlockDriverState *bs)
|
651 | b338082b | bellard | { |
652 | 1b7bdbc1 | Stefan Hajnoczi | /* remove from list, if necessary */
|
653 | 1b7bdbc1 | Stefan Hajnoczi | if (bs->device_name[0] != '\0') { |
654 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_REMOVE(&bdrv_states, bs, list); |
655 | 1b7bdbc1 | Stefan Hajnoczi | } |
656 | 34c6f050 | aurel32 | |
657 | b338082b | bellard | bdrv_close(bs); |
658 | 66f82cee | Kevin Wolf | if (bs->file != NULL) { |
659 | 66f82cee | Kevin Wolf | bdrv_delete(bs->file); |
660 | 66f82cee | Kevin Wolf | } |
661 | 66f82cee | Kevin Wolf | |
662 | b338082b | bellard | qemu_free(bs); |
663 | fc01f7e7 | bellard | } |
664 | fc01f7e7 | bellard | |
665 | e97fc193 | aliguori | /*
|
666 | e97fc193 | aliguori | * Run consistency checks on an image
|
667 | e97fc193 | aliguori | *
|
668 | e97fc193 | aliguori | * Returns the number of errors or -errno when an internal error occurs
|
669 | e97fc193 | aliguori | */
|
670 | e97fc193 | aliguori | int bdrv_check(BlockDriverState *bs)
|
671 | e97fc193 | aliguori | { |
672 | e97fc193 | aliguori | if (bs->drv->bdrv_check == NULL) { |
673 | e97fc193 | aliguori | return -ENOTSUP;
|
674 | e97fc193 | aliguori | } |
675 | e97fc193 | aliguori | |
676 | e97fc193 | aliguori | return bs->drv->bdrv_check(bs);
|
677 | e97fc193 | aliguori | } |
678 | e97fc193 | aliguori | |
679 | 33e3963e | bellard | /* commit COW file into the raw image */
|
680 | 33e3963e | bellard | int bdrv_commit(BlockDriverState *bs)
|
681 | 33e3963e | bellard | { |
682 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
683 | 83f64091 | bellard | int64_t i, total_sectors; |
684 | 4dca4b63 | Naphtali Sprei | int n, j, ro, open_flags;
|
685 | 4dca4b63 | Naphtali Sprei | int ret = 0, rw_ret = 0; |
686 | ea2384d3 | bellard | unsigned char sector[512]; |
687 | 4dca4b63 | Naphtali Sprei | char filename[1024]; |
688 | 4dca4b63 | Naphtali Sprei | BlockDriverState *bs_rw, *bs_ro; |
689 | 33e3963e | bellard | |
690 | 19cb3738 | bellard | if (!drv)
|
691 | 19cb3738 | bellard | return -ENOMEDIUM;
|
692 | 4dca4b63 | Naphtali Sprei | |
693 | 4dca4b63 | Naphtali Sprei | if (!bs->backing_hd) {
|
694 | 4dca4b63 | Naphtali Sprei | return -ENOTSUP;
|
695 | 33e3963e | bellard | } |
696 | 33e3963e | bellard | |
697 | 4dca4b63 | Naphtali Sprei | if (bs->backing_hd->keep_read_only) {
|
698 | 4dca4b63 | Naphtali Sprei | return -EACCES;
|
699 | 4dca4b63 | Naphtali Sprei | } |
700 | 4dca4b63 | Naphtali Sprei | |
701 | 4dca4b63 | Naphtali Sprei | ro = bs->backing_hd->read_only; |
702 | 4dca4b63 | Naphtali Sprei | strncpy(filename, bs->backing_hd->filename, sizeof(filename));
|
703 | 4dca4b63 | Naphtali Sprei | open_flags = bs->backing_hd->open_flags; |
704 | 4dca4b63 | Naphtali Sprei | |
705 | 4dca4b63 | Naphtali Sprei | if (ro) {
|
706 | 4dca4b63 | Naphtali Sprei | /* re-open as RW */
|
707 | 4dca4b63 | Naphtali Sprei | bdrv_delete(bs->backing_hd); |
708 | 4dca4b63 | Naphtali Sprei | bs->backing_hd = NULL;
|
709 | 4dca4b63 | Naphtali Sprei | bs_rw = bdrv_new("");
|
710 | c3349197 | Kevin Wolf | rw_ret = bdrv_open(bs_rw, filename, open_flags | BDRV_O_RDWR, drv); |
711 | 4dca4b63 | Naphtali Sprei | if (rw_ret < 0) { |
712 | 4dca4b63 | Naphtali Sprei | bdrv_delete(bs_rw); |
713 | 4dca4b63 | Naphtali Sprei | /* try to re-open read-only */
|
714 | 4dca4b63 | Naphtali Sprei | bs_ro = bdrv_new("");
|
715 | c3349197 | Kevin Wolf | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
716 | 4dca4b63 | Naphtali Sprei | if (ret < 0) { |
717 | 4dca4b63 | Naphtali Sprei | bdrv_delete(bs_ro); |
718 | 4dca4b63 | Naphtali Sprei | /* drive not functional anymore */
|
719 | 4dca4b63 | Naphtali Sprei | bs->drv = NULL;
|
720 | 4dca4b63 | Naphtali Sprei | return ret;
|
721 | 4dca4b63 | Naphtali Sprei | } |
722 | 4dca4b63 | Naphtali Sprei | bs->backing_hd = bs_ro; |
723 | 4dca4b63 | Naphtali Sprei | return rw_ret;
|
724 | 4dca4b63 | Naphtali Sprei | } |
725 | 4dca4b63 | Naphtali Sprei | bs->backing_hd = bs_rw; |
726 | ea2384d3 | bellard | } |
727 | 33e3963e | bellard | |
728 | 6ea44308 | Jan Kiszka | total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS; |
729 | 83f64091 | bellard | for (i = 0; i < total_sectors;) { |
730 | 19cb3738 | bellard | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
731 | ea2384d3 | bellard | for(j = 0; j < n; j++) { |
732 | ea2384d3 | bellard | if (bdrv_read(bs, i, sector, 1) != 0) { |
733 | 4dca4b63 | Naphtali Sprei | ret = -EIO; |
734 | 4dca4b63 | Naphtali Sprei | goto ro_cleanup;
|
735 | ea2384d3 | bellard | } |
736 | ea2384d3 | bellard | |
737 | ea2384d3 | bellard | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
738 | 4dca4b63 | Naphtali Sprei | ret = -EIO; |
739 | 4dca4b63 | Naphtali Sprei | goto ro_cleanup;
|
740 | ea2384d3 | bellard | } |
741 | ea2384d3 | bellard | i++; |
742 | 33e3963e | bellard | } |
743 | ea2384d3 | bellard | } else {
|
744 | ea2384d3 | bellard | i += n; |
745 | ea2384d3 | bellard | } |
746 | 33e3963e | bellard | } |
747 | 95389c86 | bellard | |
748 | 1d44952f | Christoph Hellwig | if (drv->bdrv_make_empty) {
|
749 | 1d44952f | Christoph Hellwig | ret = drv->bdrv_make_empty(bs); |
750 | 1d44952f | Christoph Hellwig | bdrv_flush(bs); |
751 | 1d44952f | Christoph Hellwig | } |
752 | 95389c86 | bellard | |
753 | 3f5075ae | Christoph Hellwig | /*
|
754 | 3f5075ae | Christoph Hellwig | * Make sure all data we wrote to the backing device is actually
|
755 | 3f5075ae | Christoph Hellwig | * stable on disk.
|
756 | 3f5075ae | Christoph Hellwig | */
|
757 | 3f5075ae | Christoph Hellwig | if (bs->backing_hd)
|
758 | 3f5075ae | Christoph Hellwig | bdrv_flush(bs->backing_hd); |
759 | 4dca4b63 | Naphtali Sprei | |
760 | 4dca4b63 | Naphtali Sprei | ro_cleanup:
|
761 | 4dca4b63 | Naphtali Sprei | |
762 | 4dca4b63 | Naphtali Sprei | if (ro) {
|
763 | 4dca4b63 | Naphtali Sprei | /* re-open as RO */
|
764 | 4dca4b63 | Naphtali Sprei | bdrv_delete(bs->backing_hd); |
765 | 4dca4b63 | Naphtali Sprei | bs->backing_hd = NULL;
|
766 | 4dca4b63 | Naphtali Sprei | bs_ro = bdrv_new("");
|
767 | c3349197 | Kevin Wolf | ret = bdrv_open(bs_ro, filename, open_flags & ~BDRV_O_RDWR, drv); |
768 | 4dca4b63 | Naphtali Sprei | if (ret < 0) { |
769 | 4dca4b63 | Naphtali Sprei | bdrv_delete(bs_ro); |
770 | 4dca4b63 | Naphtali Sprei | /* drive not functional anymore */
|
771 | 4dca4b63 | Naphtali Sprei | bs->drv = NULL;
|
772 | 4dca4b63 | Naphtali Sprei | return ret;
|
773 | 4dca4b63 | Naphtali Sprei | } |
774 | 4dca4b63 | Naphtali Sprei | bs->backing_hd = bs_ro; |
775 | 4dca4b63 | Naphtali Sprei | bs->backing_hd->keep_read_only = 0;
|
776 | 4dca4b63 | Naphtali Sprei | } |
777 | 4dca4b63 | Naphtali Sprei | |
778 | 1d44952f | Christoph Hellwig | return ret;
|
779 | 33e3963e | bellard | } |
780 | 33e3963e | bellard | |
781 | 756e6736 | Kevin Wolf | /*
|
782 | 756e6736 | Kevin Wolf | * Return values:
|
783 | 756e6736 | Kevin Wolf | * 0 - success
|
784 | 756e6736 | Kevin Wolf | * -EINVAL - backing format specified, but no file
|
785 | 756e6736 | Kevin Wolf | * -ENOSPC - can't update the backing file because no space is left in the
|
786 | 756e6736 | Kevin Wolf | * image file header
|
787 | 756e6736 | Kevin Wolf | * -ENOTSUP - format driver doesn't support changing the backing file
|
788 | 756e6736 | Kevin Wolf | */
|
789 | 756e6736 | Kevin Wolf | int bdrv_change_backing_file(BlockDriverState *bs,
|
790 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt) |
791 | 756e6736 | Kevin Wolf | { |
792 | 756e6736 | Kevin Wolf | BlockDriver *drv = bs->drv; |
793 | 756e6736 | Kevin Wolf | |
794 | 756e6736 | Kevin Wolf | if (drv->bdrv_change_backing_file != NULL) { |
795 | 756e6736 | Kevin Wolf | return drv->bdrv_change_backing_file(bs, backing_file, backing_fmt);
|
796 | 756e6736 | Kevin Wolf | } else {
|
797 | 756e6736 | Kevin Wolf | return -ENOTSUP;
|
798 | 756e6736 | Kevin Wolf | } |
799 | 756e6736 | Kevin Wolf | } |
800 | 756e6736 | Kevin Wolf | |
801 | 71d0770c | aliguori | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
802 | 71d0770c | aliguori | size_t size) |
803 | 71d0770c | aliguori | { |
804 | 71d0770c | aliguori | int64_t len; |
805 | 71d0770c | aliguori | |
806 | 71d0770c | aliguori | if (!bdrv_is_inserted(bs))
|
807 | 71d0770c | aliguori | return -ENOMEDIUM;
|
808 | 71d0770c | aliguori | |
809 | 71d0770c | aliguori | if (bs->growable)
|
810 | 71d0770c | aliguori | return 0; |
811 | 71d0770c | aliguori | |
812 | 71d0770c | aliguori | len = bdrv_getlength(bs); |
813 | 71d0770c | aliguori | |
814 | fbb7b4e0 | Kevin Wolf | if (offset < 0) |
815 | fbb7b4e0 | Kevin Wolf | return -EIO;
|
816 | fbb7b4e0 | Kevin Wolf | |
817 | fbb7b4e0 | Kevin Wolf | if ((offset > len) || (len - offset < size))
|
818 | 71d0770c | aliguori | return -EIO;
|
819 | 71d0770c | aliguori | |
820 | 71d0770c | aliguori | return 0; |
821 | 71d0770c | aliguori | } |
822 | 71d0770c | aliguori | |
823 | 71d0770c | aliguori | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
824 | 71d0770c | aliguori | int nb_sectors)
|
825 | 71d0770c | aliguori | { |
826 | 999dec57 | aliguori | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
827 | 71d0770c | aliguori | } |
828 | 71d0770c | aliguori | |
829 | 19cb3738 | bellard | /* return < 0 if error. See bdrv_write() for the return codes */
|
830 | 5fafdf24 | ths | int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
831 | fc01f7e7 | bellard | uint8_t *buf, int nb_sectors)
|
832 | fc01f7e7 | bellard | { |
833 | ea2384d3 | bellard | BlockDriver *drv = bs->drv; |
834 | ea2384d3 | bellard | |
835 | 19cb3738 | bellard | if (!drv)
|
836 | 19cb3738 | bellard | return -ENOMEDIUM;
|
837 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
838 | 71d0770c | aliguori | return -EIO;
|
839 | b338082b | bellard | |
840 | eda578e5 | aliguori | return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
841 | fc01f7e7 | bellard | } |
842 | fc01f7e7 | bellard | |
843 | 7cd1e32a | lirans@il.ibm.com | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
844 | a55eb92c | Jan Kiszka | int nb_sectors, int dirty) |
845 | 7cd1e32a | lirans@il.ibm.com | { |
846 | 7cd1e32a | lirans@il.ibm.com | int64_t start, end; |
847 | c6d22830 | Jan Kiszka | unsigned long val, idx, bit; |
848 | a55eb92c | Jan Kiszka | |
849 | 6ea44308 | Jan Kiszka | start = sector_num / BDRV_SECTORS_PER_DIRTY_CHUNK; |
850 | c6d22830 | Jan Kiszka | end = (sector_num + nb_sectors - 1) / BDRV_SECTORS_PER_DIRTY_CHUNK;
|
851 | a55eb92c | Jan Kiszka | |
852 | a55eb92c | Jan Kiszka | for (; start <= end; start++) {
|
853 | c6d22830 | Jan Kiszka | idx = start / (sizeof(unsigned long) * 8); |
854 | c6d22830 | Jan Kiszka | bit = start % (sizeof(unsigned long) * 8); |
855 | c6d22830 | Jan Kiszka | val = bs->dirty_bitmap[idx]; |
856 | c6d22830 | Jan Kiszka | if (dirty) {
|
857 | aaa0eb75 | Liran Schour | if (!(val & (1 << bit))) { |
858 | aaa0eb75 | Liran Schour | bs->dirty_count++; |
859 | aaa0eb75 | Liran Schour | val |= 1 << bit;
|
860 | aaa0eb75 | Liran Schour | } |
861 | c6d22830 | Jan Kiszka | } else {
|
862 | aaa0eb75 | Liran Schour | if (val & (1 << bit)) { |
863 | aaa0eb75 | Liran Schour | bs->dirty_count--; |
864 | aaa0eb75 | Liran Schour | val &= ~(1 << bit);
|
865 | aaa0eb75 | Liran Schour | } |
866 | c6d22830 | Jan Kiszka | } |
867 | c6d22830 | Jan Kiszka | bs->dirty_bitmap[idx] = val; |
868 | 7cd1e32a | lirans@il.ibm.com | } |
869 | 7cd1e32a | lirans@il.ibm.com | } |
870 | 7cd1e32a | lirans@il.ibm.com | |
871 | 5fafdf24 | ths | /* Return < 0 if error. Important errors are:
|
872 | 19cb3738 | bellard | -EIO generic I/O error (may happen for all errors)
|
873 | 19cb3738 | bellard | -ENOMEDIUM No media inserted.
|
874 | 19cb3738 | bellard | -EINVAL Invalid sector number or nb_sectors
|
875 | 19cb3738 | bellard | -EACCES Trying to write a read-only device
|
876 | 19cb3738 | bellard | */
|
877 | 5fafdf24 | ths | int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
878 | fc01f7e7 | bellard | const uint8_t *buf, int nb_sectors) |
879 | fc01f7e7 | bellard | { |
880 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
881 | 19cb3738 | bellard | if (!bs->drv)
|
882 | 19cb3738 | bellard | return -ENOMEDIUM;
|
883 | 0849bf08 | bellard | if (bs->read_only)
|
884 | 19cb3738 | bellard | return -EACCES;
|
885 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
886 | 71d0770c | aliguori | return -EIO;
|
887 | a55eb92c | Jan Kiszka | |
888 | c6d22830 | Jan Kiszka | if (bs->dirty_bitmap) {
|
889 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
890 | 7cd1e32a | lirans@il.ibm.com | } |
891 | a55eb92c | Jan Kiszka | |
892 | 294cc35f | Kevin Wolf | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
893 | 294cc35f | Kevin Wolf | bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
894 | 294cc35f | Kevin Wolf | } |
895 | 294cc35f | Kevin Wolf | |
896 | 42fb2807 | aliguori | return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
897 | 83f64091 | bellard | } |
898 | 83f64091 | bellard | |
899 | eda578e5 | aliguori | int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
900 | eda578e5 | aliguori | void *buf, int count1) |
901 | 83f64091 | bellard | { |
902 | 6ea44308 | Jan Kiszka | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
903 | 83f64091 | bellard | int len, nb_sectors, count;
|
904 | 83f64091 | bellard | int64_t sector_num; |
905 | 9a8c4cce | Kevin Wolf | int ret;
|
906 | 83f64091 | bellard | |
907 | 83f64091 | bellard | count = count1; |
908 | 83f64091 | bellard | /* first read to align to sector start */
|
909 | 6ea44308 | Jan Kiszka | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
910 | 83f64091 | bellard | if (len > count)
|
911 | 83f64091 | bellard | len = count; |
912 | 6ea44308 | Jan Kiszka | sector_num = offset >> BDRV_SECTOR_BITS; |
913 | 83f64091 | bellard | if (len > 0) { |
914 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
915 | 9a8c4cce | Kevin Wolf | return ret;
|
916 | 6ea44308 | Jan Kiszka | memcpy(buf, tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), len);
|
917 | 83f64091 | bellard | count -= len; |
918 | 83f64091 | bellard | if (count == 0) |
919 | 83f64091 | bellard | return count1;
|
920 | 83f64091 | bellard | sector_num++; |
921 | 83f64091 | bellard | buf += len; |
922 | 83f64091 | bellard | } |
923 | 83f64091 | bellard | |
924 | 83f64091 | bellard | /* read the sectors "in place" */
|
925 | 6ea44308 | Jan Kiszka | nb_sectors = count >> BDRV_SECTOR_BITS; |
926 | 83f64091 | bellard | if (nb_sectors > 0) { |
927 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_read(bs, sector_num, buf, nb_sectors)) < 0) |
928 | 9a8c4cce | Kevin Wolf | return ret;
|
929 | 83f64091 | bellard | sector_num += nb_sectors; |
930 | 6ea44308 | Jan Kiszka | len = nb_sectors << BDRV_SECTOR_BITS; |
931 | 83f64091 | bellard | buf += len; |
932 | 83f64091 | bellard | count -= len; |
933 | 83f64091 | bellard | } |
934 | 83f64091 | bellard | |
935 | 83f64091 | bellard | /* add data from the last sector */
|
936 | 83f64091 | bellard | if (count > 0) { |
937 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
938 | 9a8c4cce | Kevin Wolf | return ret;
|
939 | 83f64091 | bellard | memcpy(buf, tmp_buf, count); |
940 | 83f64091 | bellard | } |
941 | 83f64091 | bellard | return count1;
|
942 | 83f64091 | bellard | } |
943 | 83f64091 | bellard | |
944 | eda578e5 | aliguori | int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
945 | eda578e5 | aliguori | const void *buf, int count1) |
946 | 83f64091 | bellard | { |
947 | 6ea44308 | Jan Kiszka | uint8_t tmp_buf[BDRV_SECTOR_SIZE]; |
948 | 83f64091 | bellard | int len, nb_sectors, count;
|
949 | 83f64091 | bellard | int64_t sector_num; |
950 | 9a8c4cce | Kevin Wolf | int ret;
|
951 | 83f64091 | bellard | |
952 | 83f64091 | bellard | count = count1; |
953 | 83f64091 | bellard | /* first write to align to sector start */
|
954 | 6ea44308 | Jan Kiszka | len = (BDRV_SECTOR_SIZE - offset) & (BDRV_SECTOR_SIZE - 1);
|
955 | 83f64091 | bellard | if (len > count)
|
956 | 83f64091 | bellard | len = count; |
957 | 6ea44308 | Jan Kiszka | sector_num = offset >> BDRV_SECTOR_BITS; |
958 | 83f64091 | bellard | if (len > 0) { |
959 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
960 | 9a8c4cce | Kevin Wolf | return ret;
|
961 | 6ea44308 | Jan Kiszka | memcpy(tmp_buf + (offset & (BDRV_SECTOR_SIZE - 1)), buf, len);
|
962 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
963 | 9a8c4cce | Kevin Wolf | return ret;
|
964 | 83f64091 | bellard | count -= len; |
965 | 83f64091 | bellard | if (count == 0) |
966 | 83f64091 | bellard | return count1;
|
967 | 83f64091 | bellard | sector_num++; |
968 | 83f64091 | bellard | buf += len; |
969 | 83f64091 | bellard | } |
970 | 83f64091 | bellard | |
971 | 83f64091 | bellard | /* write the sectors "in place" */
|
972 | 6ea44308 | Jan Kiszka | nb_sectors = count >> BDRV_SECTOR_BITS; |
973 | 83f64091 | bellard | if (nb_sectors > 0) { |
974 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_write(bs, sector_num, buf, nb_sectors)) < 0) |
975 | 9a8c4cce | Kevin Wolf | return ret;
|
976 | 83f64091 | bellard | sector_num += nb_sectors; |
977 | 6ea44308 | Jan Kiszka | len = nb_sectors << BDRV_SECTOR_BITS; |
978 | 83f64091 | bellard | buf += len; |
979 | 83f64091 | bellard | count -= len; |
980 | 83f64091 | bellard | } |
981 | 83f64091 | bellard | |
982 | 83f64091 | bellard | /* add data from the last sector */
|
983 | 83f64091 | bellard | if (count > 0) { |
984 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_read(bs, sector_num, tmp_buf, 1)) < 0) |
985 | 9a8c4cce | Kevin Wolf | return ret;
|
986 | 83f64091 | bellard | memcpy(tmp_buf, buf, count); |
987 | 9a8c4cce | Kevin Wolf | if ((ret = bdrv_write(bs, sector_num, tmp_buf, 1)) < 0) |
988 | 9a8c4cce | Kevin Wolf | return ret;
|
989 | 83f64091 | bellard | } |
990 | 83f64091 | bellard | return count1;
|
991 | 83f64091 | bellard | } |
992 | 83f64091 | bellard | |
993 | 83f64091 | bellard | /**
|
994 | 83f64091 | bellard | * Truncate file to 'offset' bytes (needed only for file protocols)
|
995 | 83f64091 | bellard | */
|
996 | 83f64091 | bellard | int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
997 | 83f64091 | bellard | { |
998 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
999 | 51762288 | Stefan Hajnoczi | int ret;
|
1000 | 83f64091 | bellard | if (!drv)
|
1001 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1002 | 83f64091 | bellard | if (!drv->bdrv_truncate)
|
1003 | 83f64091 | bellard | return -ENOTSUP;
|
1004 | 59f2689d | Naphtali Sprei | if (bs->read_only)
|
1005 | 59f2689d | Naphtali Sprei | return -EACCES;
|
1006 | 51762288 | Stefan Hajnoczi | ret = drv->bdrv_truncate(bs, offset); |
1007 | 51762288 | Stefan Hajnoczi | if (ret == 0) { |
1008 | 51762288 | Stefan Hajnoczi | ret = refresh_total_sectors(bs, offset >> BDRV_SECTOR_BITS); |
1009 | 51762288 | Stefan Hajnoczi | } |
1010 | 51762288 | Stefan Hajnoczi | return ret;
|
1011 | 83f64091 | bellard | } |
1012 | 83f64091 | bellard | |
1013 | 83f64091 | bellard | /**
|
1014 | 83f64091 | bellard | * Length of a file in bytes. Return < 0 if error or unknown.
|
1015 | 83f64091 | bellard | */
|
1016 | 83f64091 | bellard | int64_t bdrv_getlength(BlockDriverState *bs) |
1017 | 83f64091 | bellard | { |
1018 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
1019 | 83f64091 | bellard | if (!drv)
|
1020 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1021 | 51762288 | Stefan Hajnoczi | |
1022 | 51762288 | Stefan Hajnoczi | /* Fixed size devices use the total_sectors value for speed instead of
|
1023 | 51762288 | Stefan Hajnoczi | issuing a length query (like lseek) on each call. Also, legacy block
|
1024 | 51762288 | Stefan Hajnoczi | drivers don't provide a bdrv_getlength function and must use
|
1025 | 51762288 | Stefan Hajnoczi | total_sectors. */
|
1026 | 51762288 | Stefan Hajnoczi | if (!bs->growable || !drv->bdrv_getlength) {
|
1027 | 6ea44308 | Jan Kiszka | return bs->total_sectors * BDRV_SECTOR_SIZE;
|
1028 | 83f64091 | bellard | } |
1029 | 83f64091 | bellard | return drv->bdrv_getlength(bs);
|
1030 | fc01f7e7 | bellard | } |
1031 | fc01f7e7 | bellard | |
1032 | 19cb3738 | bellard | /* return 0 as number of sectors if no device present or error */
|
1033 | 96b8f136 | ths | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
1034 | fc01f7e7 | bellard | { |
1035 | 19cb3738 | bellard | int64_t length; |
1036 | 19cb3738 | bellard | length = bdrv_getlength(bs); |
1037 | 19cb3738 | bellard | if (length < 0) |
1038 | 19cb3738 | bellard | length = 0;
|
1039 | 19cb3738 | bellard | else
|
1040 | 6ea44308 | Jan Kiszka | length = length >> BDRV_SECTOR_BITS; |
1041 | 19cb3738 | bellard | *nb_sectors_ptr = length; |
1042 | fc01f7e7 | bellard | } |
1043 | cf98951b | bellard | |
1044 | f3d54fc4 | aliguori | struct partition {
|
1045 | f3d54fc4 | aliguori | uint8_t boot_ind; /* 0x80 - active */
|
1046 | f3d54fc4 | aliguori | uint8_t head; /* starting head */
|
1047 | f3d54fc4 | aliguori | uint8_t sector; /* starting sector */
|
1048 | f3d54fc4 | aliguori | uint8_t cyl; /* starting cylinder */
|
1049 | f3d54fc4 | aliguori | uint8_t sys_ind; /* What partition type */
|
1050 | f3d54fc4 | aliguori | uint8_t end_head; /* end head */
|
1051 | f3d54fc4 | aliguori | uint8_t end_sector; /* end sector */
|
1052 | f3d54fc4 | aliguori | uint8_t end_cyl; /* end cylinder */
|
1053 | f3d54fc4 | aliguori | uint32_t start_sect; /* starting sector counting from 0 */
|
1054 | f3d54fc4 | aliguori | uint32_t nr_sects; /* nr of sectors in partition */
|
1055 | f3d54fc4 | aliguori | } __attribute__((packed)); |
1056 | f3d54fc4 | aliguori | |
1057 | f3d54fc4 | aliguori | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
1058 | f3d54fc4 | aliguori | static int guess_disk_lchs(BlockDriverState *bs, |
1059 | f3d54fc4 | aliguori | int *pcylinders, int *pheads, int *psectors) |
1060 | f3d54fc4 | aliguori | { |
1061 | f3d54fc4 | aliguori | uint8_t buf[512];
|
1062 | f3d54fc4 | aliguori | int ret, i, heads, sectors, cylinders;
|
1063 | f3d54fc4 | aliguori | struct partition *p;
|
1064 | f3d54fc4 | aliguori | uint32_t nr_sects; |
1065 | a38131b6 | blueswir1 | uint64_t nb_sectors; |
1066 | f3d54fc4 | aliguori | |
1067 | f3d54fc4 | aliguori | bdrv_get_geometry(bs, &nb_sectors); |
1068 | f3d54fc4 | aliguori | |
1069 | f3d54fc4 | aliguori | ret = bdrv_read(bs, 0, buf, 1); |
1070 | f3d54fc4 | aliguori | if (ret < 0) |
1071 | f3d54fc4 | aliguori | return -1; |
1072 | f3d54fc4 | aliguori | /* test msdos magic */
|
1073 | f3d54fc4 | aliguori | if (buf[510] != 0x55 || buf[511] != 0xaa) |
1074 | f3d54fc4 | aliguori | return -1; |
1075 | f3d54fc4 | aliguori | for(i = 0; i < 4; i++) { |
1076 | f3d54fc4 | aliguori | p = ((struct partition *)(buf + 0x1be)) + i; |
1077 | f3d54fc4 | aliguori | nr_sects = le32_to_cpu(p->nr_sects); |
1078 | f3d54fc4 | aliguori | if (nr_sects && p->end_head) {
|
1079 | f3d54fc4 | aliguori | /* We make the assumption that the partition terminates on
|
1080 | f3d54fc4 | aliguori | a cylinder boundary */
|
1081 | f3d54fc4 | aliguori | heads = p->end_head + 1;
|
1082 | f3d54fc4 | aliguori | sectors = p->end_sector & 63;
|
1083 | f3d54fc4 | aliguori | if (sectors == 0) |
1084 | f3d54fc4 | aliguori | continue;
|
1085 | f3d54fc4 | aliguori | cylinders = nb_sectors / (heads * sectors); |
1086 | f3d54fc4 | aliguori | if (cylinders < 1 || cylinders > 16383) |
1087 | f3d54fc4 | aliguori | continue;
|
1088 | f3d54fc4 | aliguori | *pheads = heads; |
1089 | f3d54fc4 | aliguori | *psectors = sectors; |
1090 | f3d54fc4 | aliguori | *pcylinders = cylinders; |
1091 | f3d54fc4 | aliguori | #if 0
|
1092 | f3d54fc4 | aliguori | printf("guessed geometry: LCHS=%d %d %d\n",
|
1093 | f3d54fc4 | aliguori | cylinders, heads, sectors);
|
1094 | f3d54fc4 | aliguori | #endif
|
1095 | f3d54fc4 | aliguori | return 0; |
1096 | f3d54fc4 | aliguori | } |
1097 | f3d54fc4 | aliguori | } |
1098 | f3d54fc4 | aliguori | return -1; |
1099 | f3d54fc4 | aliguori | } |
1100 | f3d54fc4 | aliguori | |
1101 | f3d54fc4 | aliguori | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
1102 | f3d54fc4 | aliguori | { |
1103 | f3d54fc4 | aliguori | int translation, lba_detected = 0; |
1104 | f3d54fc4 | aliguori | int cylinders, heads, secs;
|
1105 | a38131b6 | blueswir1 | uint64_t nb_sectors; |
1106 | f3d54fc4 | aliguori | |
1107 | f3d54fc4 | aliguori | /* if a geometry hint is available, use it */
|
1108 | f3d54fc4 | aliguori | bdrv_get_geometry(bs, &nb_sectors); |
1109 | f3d54fc4 | aliguori | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
1110 | f3d54fc4 | aliguori | translation = bdrv_get_translation_hint(bs); |
1111 | f3d54fc4 | aliguori | if (cylinders != 0) { |
1112 | f3d54fc4 | aliguori | *pcyls = cylinders; |
1113 | f3d54fc4 | aliguori | *pheads = heads; |
1114 | f3d54fc4 | aliguori | *psecs = secs; |
1115 | f3d54fc4 | aliguori | } else {
|
1116 | f3d54fc4 | aliguori | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
1117 | f3d54fc4 | aliguori | if (heads > 16) { |
1118 | f3d54fc4 | aliguori | /* if heads > 16, it means that a BIOS LBA
|
1119 | f3d54fc4 | aliguori | translation was active, so the default
|
1120 | f3d54fc4 | aliguori | hardware geometry is OK */
|
1121 | f3d54fc4 | aliguori | lba_detected = 1;
|
1122 | f3d54fc4 | aliguori | goto default_geometry;
|
1123 | f3d54fc4 | aliguori | } else {
|
1124 | f3d54fc4 | aliguori | *pcyls = cylinders; |
1125 | f3d54fc4 | aliguori | *pheads = heads; |
1126 | f3d54fc4 | aliguori | *psecs = secs; |
1127 | f3d54fc4 | aliguori | /* disable any translation to be in sync with
|
1128 | f3d54fc4 | aliguori | the logical geometry */
|
1129 | f3d54fc4 | aliguori | if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
1130 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
1131 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_NONE); |
1132 | f3d54fc4 | aliguori | } |
1133 | f3d54fc4 | aliguori | } |
1134 | f3d54fc4 | aliguori | } else {
|
1135 | f3d54fc4 | aliguori | default_geometry:
|
1136 | f3d54fc4 | aliguori | /* if no geometry, use a standard physical disk geometry */
|
1137 | f3d54fc4 | aliguori | cylinders = nb_sectors / (16 * 63); |
1138 | f3d54fc4 | aliguori | |
1139 | f3d54fc4 | aliguori | if (cylinders > 16383) |
1140 | f3d54fc4 | aliguori | cylinders = 16383;
|
1141 | f3d54fc4 | aliguori | else if (cylinders < 2) |
1142 | f3d54fc4 | aliguori | cylinders = 2;
|
1143 | f3d54fc4 | aliguori | *pcyls = cylinders; |
1144 | f3d54fc4 | aliguori | *pheads = 16;
|
1145 | f3d54fc4 | aliguori | *psecs = 63;
|
1146 | f3d54fc4 | aliguori | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
1147 | f3d54fc4 | aliguori | if ((*pcyls * *pheads) <= 131072) { |
1148 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
1149 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_LARGE); |
1150 | f3d54fc4 | aliguori | } else {
|
1151 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
1152 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_LBA); |
1153 | f3d54fc4 | aliguori | } |
1154 | f3d54fc4 | aliguori | } |
1155 | f3d54fc4 | aliguori | } |
1156 | f3d54fc4 | aliguori | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
1157 | f3d54fc4 | aliguori | } |
1158 | f3d54fc4 | aliguori | } |
1159 | f3d54fc4 | aliguori | |
1160 | 5fafdf24 | ths | void bdrv_set_geometry_hint(BlockDriverState *bs,
|
1161 | b338082b | bellard | int cyls, int heads, int secs) |
1162 | b338082b | bellard | { |
1163 | b338082b | bellard | bs->cyls = cyls; |
1164 | b338082b | bellard | bs->heads = heads; |
1165 | b338082b | bellard | bs->secs = secs; |
1166 | b338082b | bellard | } |
1167 | b338082b | bellard | |
1168 | b338082b | bellard | void bdrv_set_type_hint(BlockDriverState *bs, int type) |
1169 | b338082b | bellard | { |
1170 | b338082b | bellard | bs->type = type; |
1171 | b338082b | bellard | bs->removable = ((type == BDRV_TYPE_CDROM || |
1172 | b338082b | bellard | type == BDRV_TYPE_FLOPPY)); |
1173 | b338082b | bellard | } |
1174 | b338082b | bellard | |
1175 | 46d4767d | bellard | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
1176 | 46d4767d | bellard | { |
1177 | 46d4767d | bellard | bs->translation = translation; |
1178 | 46d4767d | bellard | } |
1179 | 46d4767d | bellard | |
1180 | 5fafdf24 | ths | void bdrv_get_geometry_hint(BlockDriverState *bs,
|
1181 | b338082b | bellard | int *pcyls, int *pheads, int *psecs) |
1182 | b338082b | bellard | { |
1183 | b338082b | bellard | *pcyls = bs->cyls; |
1184 | b338082b | bellard | *pheads = bs->heads; |
1185 | b338082b | bellard | *psecs = bs->secs; |
1186 | b338082b | bellard | } |
1187 | b338082b | bellard | |
1188 | b338082b | bellard | int bdrv_get_type_hint(BlockDriverState *bs)
|
1189 | b338082b | bellard | { |
1190 | b338082b | bellard | return bs->type;
|
1191 | b338082b | bellard | } |
1192 | b338082b | bellard | |
1193 | 46d4767d | bellard | int bdrv_get_translation_hint(BlockDriverState *bs)
|
1194 | 46d4767d | bellard | { |
1195 | 46d4767d | bellard | return bs->translation;
|
1196 | 46d4767d | bellard | } |
1197 | 46d4767d | bellard | |
1198 | b338082b | bellard | int bdrv_is_removable(BlockDriverState *bs)
|
1199 | b338082b | bellard | { |
1200 | b338082b | bellard | return bs->removable;
|
1201 | b338082b | bellard | } |
1202 | b338082b | bellard | |
1203 | b338082b | bellard | int bdrv_is_read_only(BlockDriverState *bs)
|
1204 | b338082b | bellard | { |
1205 | b338082b | bellard | return bs->read_only;
|
1206 | b338082b | bellard | } |
1207 | b338082b | bellard | |
1208 | 985a03b0 | ths | int bdrv_is_sg(BlockDriverState *bs)
|
1209 | 985a03b0 | ths | { |
1210 | 985a03b0 | ths | return bs->sg;
|
1211 | 985a03b0 | ths | } |
1212 | 985a03b0 | ths | |
1213 | e900a7b7 | Christoph Hellwig | int bdrv_enable_write_cache(BlockDriverState *bs)
|
1214 | e900a7b7 | Christoph Hellwig | { |
1215 | e900a7b7 | Christoph Hellwig | return bs->enable_write_cache;
|
1216 | e900a7b7 | Christoph Hellwig | } |
1217 | e900a7b7 | Christoph Hellwig | |
1218 | 19cb3738 | bellard | /* XXX: no longer used */
|
1219 | 5fafdf24 | ths | void bdrv_set_change_cb(BlockDriverState *bs,
|
1220 | b338082b | bellard | void (*change_cb)(void *opaque), void *opaque) |
1221 | b338082b | bellard | { |
1222 | b338082b | bellard | bs->change_cb = change_cb; |
1223 | b338082b | bellard | bs->change_opaque = opaque; |
1224 | b338082b | bellard | } |
1225 | b338082b | bellard | |
1226 | ea2384d3 | bellard | int bdrv_is_encrypted(BlockDriverState *bs)
|
1227 | ea2384d3 | bellard | { |
1228 | ea2384d3 | bellard | if (bs->backing_hd && bs->backing_hd->encrypted)
|
1229 | ea2384d3 | bellard | return 1; |
1230 | ea2384d3 | bellard | return bs->encrypted;
|
1231 | ea2384d3 | bellard | } |
1232 | ea2384d3 | bellard | |
1233 | c0f4ce77 | aliguori | int bdrv_key_required(BlockDriverState *bs)
|
1234 | c0f4ce77 | aliguori | { |
1235 | c0f4ce77 | aliguori | BlockDriverState *backing_hd = bs->backing_hd; |
1236 | c0f4ce77 | aliguori | |
1237 | c0f4ce77 | aliguori | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1238 | c0f4ce77 | aliguori | return 1; |
1239 | c0f4ce77 | aliguori | return (bs->encrypted && !bs->valid_key);
|
1240 | c0f4ce77 | aliguori | } |
1241 | c0f4ce77 | aliguori | |
1242 | ea2384d3 | bellard | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1243 | ea2384d3 | bellard | { |
1244 | ea2384d3 | bellard | int ret;
|
1245 | ea2384d3 | bellard | if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1246 | ea2384d3 | bellard | ret = bdrv_set_key(bs->backing_hd, key); |
1247 | ea2384d3 | bellard | if (ret < 0) |
1248 | ea2384d3 | bellard | return ret;
|
1249 | ea2384d3 | bellard | if (!bs->encrypted)
|
1250 | ea2384d3 | bellard | return 0; |
1251 | ea2384d3 | bellard | } |
1252 | fd04a2ae | Shahar Havivi | if (!bs->encrypted) {
|
1253 | fd04a2ae | Shahar Havivi | return -EINVAL;
|
1254 | fd04a2ae | Shahar Havivi | } else if (!bs->drv || !bs->drv->bdrv_set_key) { |
1255 | fd04a2ae | Shahar Havivi | return -ENOMEDIUM;
|
1256 | fd04a2ae | Shahar Havivi | } |
1257 | c0f4ce77 | aliguori | ret = bs->drv->bdrv_set_key(bs, key); |
1258 | bb5fc20f | aliguori | if (ret < 0) { |
1259 | bb5fc20f | aliguori | bs->valid_key = 0;
|
1260 | bb5fc20f | aliguori | } else if (!bs->valid_key) { |
1261 | bb5fc20f | aliguori | bs->valid_key = 1;
|
1262 | bb5fc20f | aliguori | /* call the change callback now, we skipped it on open */
|
1263 | bb5fc20f | aliguori | bs->media_changed = 1;
|
1264 | bb5fc20f | aliguori | if (bs->change_cb)
|
1265 | bb5fc20f | aliguori | bs->change_cb(bs->change_opaque); |
1266 | bb5fc20f | aliguori | } |
1267 | c0f4ce77 | aliguori | return ret;
|
1268 | ea2384d3 | bellard | } |
1269 | ea2384d3 | bellard | |
1270 | ea2384d3 | bellard | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1271 | ea2384d3 | bellard | { |
1272 | 19cb3738 | bellard | if (!bs->drv) {
|
1273 | ea2384d3 | bellard | buf[0] = '\0'; |
1274 | ea2384d3 | bellard | } else {
|
1275 | ea2384d3 | bellard | pstrcpy(buf, buf_size, bs->drv->format_name); |
1276 | ea2384d3 | bellard | } |
1277 | ea2384d3 | bellard | } |
1278 | ea2384d3 | bellard | |
1279 | 5fafdf24 | ths | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1280 | ea2384d3 | bellard | void *opaque)
|
1281 | ea2384d3 | bellard | { |
1282 | ea2384d3 | bellard | BlockDriver *drv; |
1283 | ea2384d3 | bellard | |
1284 | 8a22f02a | Stefan Hajnoczi | QLIST_FOREACH(drv, &bdrv_drivers, list) { |
1285 | ea2384d3 | bellard | it(opaque, drv->format_name); |
1286 | ea2384d3 | bellard | } |
1287 | ea2384d3 | bellard | } |
1288 | ea2384d3 | bellard | |
1289 | b338082b | bellard | BlockDriverState *bdrv_find(const char *name) |
1290 | b338082b | bellard | { |
1291 | b338082b | bellard | BlockDriverState *bs; |
1292 | b338082b | bellard | |
1293 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1294 | 1b7bdbc1 | Stefan Hajnoczi | if (!strcmp(name, bs->device_name)) {
|
1295 | b338082b | bellard | return bs;
|
1296 | 1b7bdbc1 | Stefan Hajnoczi | } |
1297 | b338082b | bellard | } |
1298 | b338082b | bellard | return NULL; |
1299 | b338082b | bellard | } |
1300 | b338082b | bellard | |
1301 | 51de9760 | aliguori | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1302 | 81d0912d | bellard | { |
1303 | 81d0912d | bellard | BlockDriverState *bs; |
1304 | 81d0912d | bellard | |
1305 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1306 | 51de9760 | aliguori | it(opaque, bs); |
1307 | 81d0912d | bellard | } |
1308 | 81d0912d | bellard | } |
1309 | 81d0912d | bellard | |
1310 | ea2384d3 | bellard | const char *bdrv_get_device_name(BlockDriverState *bs) |
1311 | ea2384d3 | bellard | { |
1312 | ea2384d3 | bellard | return bs->device_name;
|
1313 | ea2384d3 | bellard | } |
1314 | ea2384d3 | bellard | |
1315 | 7a6cba61 | pbrook | void bdrv_flush(BlockDriverState *bs)
|
1316 | 7a6cba61 | pbrook | { |
1317 | 016f5cf6 | Alexander Graf | if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
1318 | 016f5cf6 | Alexander Graf | return;
|
1319 | 016f5cf6 | Alexander Graf | } |
1320 | 016f5cf6 | Alexander Graf | |
1321 | 3f5075ae | Christoph Hellwig | if (bs->drv && bs->drv->bdrv_flush)
|
1322 | 7a6cba61 | pbrook | bs->drv->bdrv_flush(bs); |
1323 | 7a6cba61 | pbrook | } |
1324 | 7a6cba61 | pbrook | |
1325 | c6ca28d6 | aliguori | void bdrv_flush_all(void) |
1326 | c6ca28d6 | aliguori | { |
1327 | c6ca28d6 | aliguori | BlockDriverState *bs; |
1328 | c6ca28d6 | aliguori | |
1329 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1330 | 1b7bdbc1 | Stefan Hajnoczi | if (bs->drv && !bdrv_is_read_only(bs) &&
|
1331 | 1b7bdbc1 | Stefan Hajnoczi | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) { |
1332 | c6ca28d6 | aliguori | bdrv_flush(bs); |
1333 | 1b7bdbc1 | Stefan Hajnoczi | } |
1334 | 1b7bdbc1 | Stefan Hajnoczi | } |
1335 | c6ca28d6 | aliguori | } |
1336 | c6ca28d6 | aliguori | |
1337 | f2feebbd | Kevin Wolf | int bdrv_has_zero_init(BlockDriverState *bs)
|
1338 | f2feebbd | Kevin Wolf | { |
1339 | f2feebbd | Kevin Wolf | assert(bs->drv); |
1340 | f2feebbd | Kevin Wolf | |
1341 | f2feebbd | Kevin Wolf | if (bs->drv->no_zero_init) {
|
1342 | f2feebbd | Kevin Wolf | return 0; |
1343 | f2feebbd | Kevin Wolf | } else if (bs->file) { |
1344 | f2feebbd | Kevin Wolf | return bdrv_has_zero_init(bs->file);
|
1345 | f2feebbd | Kevin Wolf | } |
1346 | f2feebbd | Kevin Wolf | |
1347 | f2feebbd | Kevin Wolf | return 1; |
1348 | f2feebbd | Kevin Wolf | } |
1349 | f2feebbd | Kevin Wolf | |
1350 | f58c7b35 | ths | /*
|
1351 | f58c7b35 | ths | * Returns true iff the specified sector is present in the disk image. Drivers
|
1352 | f58c7b35 | ths | * not implementing the functionality are assumed to not support backing files,
|
1353 | f58c7b35 | ths | * hence all their sectors are reported as allocated.
|
1354 | f58c7b35 | ths | *
|
1355 | f58c7b35 | ths | * 'pnum' is set to the number of sectors (including and immediately following
|
1356 | f58c7b35 | ths | * the specified sector) that are known to be in the same
|
1357 | f58c7b35 | ths | * allocated/unallocated state.
|
1358 | f58c7b35 | ths | *
|
1359 | f58c7b35 | ths | * 'nb_sectors' is the max value 'pnum' should be set to.
|
1360 | f58c7b35 | ths | */
|
1361 | f58c7b35 | ths | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1362 | f58c7b35 | ths | int *pnum)
|
1363 | f58c7b35 | ths | { |
1364 | f58c7b35 | ths | int64_t n; |
1365 | f58c7b35 | ths | if (!bs->drv->bdrv_is_allocated) {
|
1366 | f58c7b35 | ths | if (sector_num >= bs->total_sectors) {
|
1367 | f58c7b35 | ths | *pnum = 0;
|
1368 | f58c7b35 | ths | return 0; |
1369 | f58c7b35 | ths | } |
1370 | f58c7b35 | ths | n = bs->total_sectors - sector_num; |
1371 | f58c7b35 | ths | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1372 | f58c7b35 | ths | return 1; |
1373 | f58c7b35 | ths | } |
1374 | f58c7b35 | ths | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1375 | f58c7b35 | ths | } |
1376 | f58c7b35 | ths | |
1377 | 2582bfed | Luiz Capitulino | void bdrv_mon_event(const BlockDriverState *bdrv, |
1378 | 2582bfed | Luiz Capitulino | BlockMonEventAction action, int is_read)
|
1379 | 2582bfed | Luiz Capitulino | { |
1380 | 2582bfed | Luiz Capitulino | QObject *data; |
1381 | 2582bfed | Luiz Capitulino | const char *action_str; |
1382 | 2582bfed | Luiz Capitulino | |
1383 | 2582bfed | Luiz Capitulino | switch (action) {
|
1384 | 2582bfed | Luiz Capitulino | case BDRV_ACTION_REPORT:
|
1385 | 2582bfed | Luiz Capitulino | action_str = "report";
|
1386 | 2582bfed | Luiz Capitulino | break;
|
1387 | 2582bfed | Luiz Capitulino | case BDRV_ACTION_IGNORE:
|
1388 | 2582bfed | Luiz Capitulino | action_str = "ignore";
|
1389 | 2582bfed | Luiz Capitulino | break;
|
1390 | 2582bfed | Luiz Capitulino | case BDRV_ACTION_STOP:
|
1391 | 2582bfed | Luiz Capitulino | action_str = "stop";
|
1392 | 2582bfed | Luiz Capitulino | break;
|
1393 | 2582bfed | Luiz Capitulino | default:
|
1394 | 2582bfed | Luiz Capitulino | abort(); |
1395 | 2582bfed | Luiz Capitulino | } |
1396 | 2582bfed | Luiz Capitulino | |
1397 | 2582bfed | Luiz Capitulino | data = qobject_from_jsonf("{ 'device': %s, 'action': %s, 'operation': %s }",
|
1398 | 2582bfed | Luiz Capitulino | bdrv->device_name, |
1399 | 2582bfed | Luiz Capitulino | action_str, |
1400 | 2582bfed | Luiz Capitulino | is_read ? "read" : "write"); |
1401 | 2582bfed | Luiz Capitulino | monitor_protocol_event(QEVENT_BLOCK_IO_ERROR, data); |
1402 | 2582bfed | Luiz Capitulino | |
1403 | 2582bfed | Luiz Capitulino | qobject_decref(data); |
1404 | 2582bfed | Luiz Capitulino | } |
1405 | 2582bfed | Luiz Capitulino | |
1406 | d15e5465 | Luiz Capitulino | static void bdrv_print_dict(QObject *obj, void *opaque) |
1407 | b338082b | bellard | { |
1408 | d15e5465 | Luiz Capitulino | QDict *bs_dict; |
1409 | d15e5465 | Luiz Capitulino | Monitor *mon = opaque; |
1410 | d15e5465 | Luiz Capitulino | |
1411 | d15e5465 | Luiz Capitulino | bs_dict = qobject_to_qdict(obj); |
1412 | d15e5465 | Luiz Capitulino | |
1413 | d15e5465 | Luiz Capitulino | monitor_printf(mon, "%s: type=%s removable=%d",
|
1414 | d15e5465 | Luiz Capitulino | qdict_get_str(bs_dict, "device"),
|
1415 | d15e5465 | Luiz Capitulino | qdict_get_str(bs_dict, "type"),
|
1416 | d15e5465 | Luiz Capitulino | qdict_get_bool(bs_dict, "removable"));
|
1417 | d15e5465 | Luiz Capitulino | |
1418 | d15e5465 | Luiz Capitulino | if (qdict_get_bool(bs_dict, "removable")) { |
1419 | d15e5465 | Luiz Capitulino | monitor_printf(mon, " locked=%d", qdict_get_bool(bs_dict, "locked")); |
1420 | d15e5465 | Luiz Capitulino | } |
1421 | d15e5465 | Luiz Capitulino | |
1422 | d15e5465 | Luiz Capitulino | if (qdict_haskey(bs_dict, "inserted")) { |
1423 | d15e5465 | Luiz Capitulino | QDict *qdict = qobject_to_qdict(qdict_get(bs_dict, "inserted"));
|
1424 | d15e5465 | Luiz Capitulino | |
1425 | d15e5465 | Luiz Capitulino | monitor_printf(mon, " file=");
|
1426 | d15e5465 | Luiz Capitulino | monitor_print_filename(mon, qdict_get_str(qdict, "file"));
|
1427 | d15e5465 | Luiz Capitulino | if (qdict_haskey(qdict, "backing_file")) { |
1428 | d15e5465 | Luiz Capitulino | monitor_printf(mon, " backing_file=");
|
1429 | d15e5465 | Luiz Capitulino | monitor_print_filename(mon, qdict_get_str(qdict, "backing_file"));
|
1430 | d15e5465 | Luiz Capitulino | } |
1431 | d15e5465 | Luiz Capitulino | monitor_printf(mon, " ro=%d drv=%s encrypted=%d",
|
1432 | d15e5465 | Luiz Capitulino | qdict_get_bool(qdict, "ro"),
|
1433 | d15e5465 | Luiz Capitulino | qdict_get_str(qdict, "drv"),
|
1434 | d15e5465 | Luiz Capitulino | qdict_get_bool(qdict, "encrypted"));
|
1435 | d15e5465 | Luiz Capitulino | } else {
|
1436 | d15e5465 | Luiz Capitulino | monitor_printf(mon, " [not inserted]");
|
1437 | d15e5465 | Luiz Capitulino | } |
1438 | d15e5465 | Luiz Capitulino | |
1439 | d15e5465 | Luiz Capitulino | monitor_printf(mon, "\n");
|
1440 | d15e5465 | Luiz Capitulino | } |
1441 | d15e5465 | Luiz Capitulino | |
1442 | d15e5465 | Luiz Capitulino | void bdrv_info_print(Monitor *mon, const QObject *data) |
1443 | d15e5465 | Luiz Capitulino | { |
1444 | d15e5465 | Luiz Capitulino | qlist_iter(qobject_to_qlist(data), bdrv_print_dict, mon); |
1445 | d15e5465 | Luiz Capitulino | } |
1446 | d15e5465 | Luiz Capitulino | |
1447 | d15e5465 | Luiz Capitulino | /**
|
1448 | d15e5465 | Luiz Capitulino | * bdrv_info(): Block devices information
|
1449 | d15e5465 | Luiz Capitulino | *
|
1450 | d15e5465 | Luiz Capitulino | * Each block device information is stored in a QDict and the
|
1451 | d15e5465 | Luiz Capitulino | * returned QObject is a QList of all devices.
|
1452 | d15e5465 | Luiz Capitulino | *
|
1453 | d15e5465 | Luiz Capitulino | * The QDict contains the following:
|
1454 | d15e5465 | Luiz Capitulino | *
|
1455 | d15e5465 | Luiz Capitulino | * - "device": device name
|
1456 | d15e5465 | Luiz Capitulino | * - "type": device type
|
1457 | d15e5465 | Luiz Capitulino | * - "removable": true if the device is removable, false otherwise
|
1458 | d15e5465 | Luiz Capitulino | * - "locked": true if the device is locked, false otherwise
|
1459 | d15e5465 | Luiz Capitulino | * - "inserted": only present if the device is inserted, it is a QDict
|
1460 | d15e5465 | Luiz Capitulino | * containing the following:
|
1461 | d15e5465 | Luiz Capitulino | * - "file": device file name
|
1462 | d15e5465 | Luiz Capitulino | * - "ro": true if read-only, false otherwise
|
1463 | d15e5465 | Luiz Capitulino | * - "drv": driver format name
|
1464 | d15e5465 | Luiz Capitulino | * - "backing_file": backing file name if one is used
|
1465 | d15e5465 | Luiz Capitulino | * - "encrypted": true if encrypted, false otherwise
|
1466 | d15e5465 | Luiz Capitulino | *
|
1467 | d15e5465 | Luiz Capitulino | * Example:
|
1468 | d15e5465 | Luiz Capitulino | *
|
1469 | d15e5465 | Luiz Capitulino | * [ { "device": "ide0-hd0", "type": "hd", "removable": false, "locked": false,
|
1470 | d15e5465 | Luiz Capitulino | * "inserted": { "file": "/tmp/foobar", "ro": false, "drv": "qcow2" } },
|
1471 | d15e5465 | Luiz Capitulino | * { "device": "floppy0", "type": "floppy", "removable": true,
|
1472 | d15e5465 | Luiz Capitulino | * "locked": false } ]
|
1473 | d15e5465 | Luiz Capitulino | */
|
1474 | d15e5465 | Luiz Capitulino | void bdrv_info(Monitor *mon, QObject **ret_data)
|
1475 | d15e5465 | Luiz Capitulino | { |
1476 | d15e5465 | Luiz Capitulino | QList *bs_list; |
1477 | b338082b | bellard | BlockDriverState *bs; |
1478 | b338082b | bellard | |
1479 | d15e5465 | Luiz Capitulino | bs_list = qlist_new(); |
1480 | d15e5465 | Luiz Capitulino | |
1481 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1482 | d15e5465 | Luiz Capitulino | QObject *bs_obj; |
1483 | d15e5465 | Luiz Capitulino | const char *type = "unknown"; |
1484 | d15e5465 | Luiz Capitulino | |
1485 | b338082b | bellard | switch(bs->type) {
|
1486 | b338082b | bellard | case BDRV_TYPE_HD:
|
1487 | d15e5465 | Luiz Capitulino | type = "hd";
|
1488 | b338082b | bellard | break;
|
1489 | b338082b | bellard | case BDRV_TYPE_CDROM:
|
1490 | d15e5465 | Luiz Capitulino | type = "cdrom";
|
1491 | b338082b | bellard | break;
|
1492 | b338082b | bellard | case BDRV_TYPE_FLOPPY:
|
1493 | d15e5465 | Luiz Capitulino | type = "floppy";
|
1494 | b338082b | bellard | break;
|
1495 | b338082b | bellard | } |
1496 | d15e5465 | Luiz Capitulino | |
1497 | d15e5465 | Luiz Capitulino | bs_obj = qobject_from_jsonf("{ 'device': %s, 'type': %s, "
|
1498 | d15e5465 | Luiz Capitulino | "'removable': %i, 'locked': %i }",
|
1499 | d15e5465 | Luiz Capitulino | bs->device_name, type, bs->removable, |
1500 | d15e5465 | Luiz Capitulino | bs->locked); |
1501 | d15e5465 | Luiz Capitulino | |
1502 | 19cb3738 | bellard | if (bs->drv) {
|
1503 | d15e5465 | Luiz Capitulino | QObject *obj; |
1504 | d15e5465 | Luiz Capitulino | QDict *bs_dict = qobject_to_qdict(bs_obj); |
1505 | d15e5465 | Luiz Capitulino | |
1506 | d15e5465 | Luiz Capitulino | obj = qobject_from_jsonf("{ 'file': %s, 'ro': %i, 'drv': %s, "
|
1507 | d15e5465 | Luiz Capitulino | "'encrypted': %i }",
|
1508 | d15e5465 | Luiz Capitulino | bs->filename, bs->read_only, |
1509 | d15e5465 | Luiz Capitulino | bs->drv->format_name, |
1510 | d15e5465 | Luiz Capitulino | bdrv_is_encrypted(bs)); |
1511 | fef30743 | ths | if (bs->backing_file[0] != '\0') { |
1512 | d15e5465 | Luiz Capitulino | QDict *qdict = qobject_to_qdict(obj); |
1513 | d15e5465 | Luiz Capitulino | qdict_put(qdict, "backing_file",
|
1514 | d15e5465 | Luiz Capitulino | qstring_from_str(bs->backing_file)); |
1515 | 376253ec | aliguori | } |
1516 | d15e5465 | Luiz Capitulino | |
1517 | d15e5465 | Luiz Capitulino | qdict_put_obj(bs_dict, "inserted", obj);
|
1518 | b338082b | bellard | } |
1519 | d15e5465 | Luiz Capitulino | qlist_append_obj(bs_list, bs_obj); |
1520 | b338082b | bellard | } |
1521 | d15e5465 | Luiz Capitulino | |
1522 | d15e5465 | Luiz Capitulino | *ret_data = QOBJECT(bs_list); |
1523 | b338082b | bellard | } |
1524 | a36e69dd | ths | |
1525 | 218a536a | Luiz Capitulino | static void bdrv_stats_iter(QObject *data, void *opaque) |
1526 | a36e69dd | ths | { |
1527 | 218a536a | Luiz Capitulino | QDict *qdict; |
1528 | 218a536a | Luiz Capitulino | Monitor *mon = opaque; |
1529 | 218a536a | Luiz Capitulino | |
1530 | 218a536a | Luiz Capitulino | qdict = qobject_to_qdict(data); |
1531 | 218a536a | Luiz Capitulino | monitor_printf(mon, "%s:", qdict_get_str(qdict, "device")); |
1532 | 218a536a | Luiz Capitulino | |
1533 | 218a536a | Luiz Capitulino | qdict = qobject_to_qdict(qdict_get(qdict, "stats"));
|
1534 | 218a536a | Luiz Capitulino | monitor_printf(mon, " rd_bytes=%" PRId64
|
1535 | 218a536a | Luiz Capitulino | " wr_bytes=%" PRId64
|
1536 | 218a536a | Luiz Capitulino | " rd_operations=%" PRId64
|
1537 | 218a536a | Luiz Capitulino | " wr_operations=%" PRId64
|
1538 | 218a536a | Luiz Capitulino | "\n",
|
1539 | 218a536a | Luiz Capitulino | qdict_get_int(qdict, "rd_bytes"),
|
1540 | 218a536a | Luiz Capitulino | qdict_get_int(qdict, "wr_bytes"),
|
1541 | 218a536a | Luiz Capitulino | qdict_get_int(qdict, "rd_operations"),
|
1542 | 218a536a | Luiz Capitulino | qdict_get_int(qdict, "wr_operations"));
|
1543 | 218a536a | Luiz Capitulino | } |
1544 | 218a536a | Luiz Capitulino | |
1545 | 218a536a | Luiz Capitulino | void bdrv_stats_print(Monitor *mon, const QObject *data) |
1546 | 218a536a | Luiz Capitulino | { |
1547 | 218a536a | Luiz Capitulino | qlist_iter(qobject_to_qlist(data), bdrv_stats_iter, mon); |
1548 | 218a536a | Luiz Capitulino | } |
1549 | 218a536a | Luiz Capitulino | |
1550 | 294cc35f | Kevin Wolf | static QObject* bdrv_info_stats_bs(BlockDriverState *bs)
|
1551 | 294cc35f | Kevin Wolf | { |
1552 | 294cc35f | Kevin Wolf | QObject *res; |
1553 | 294cc35f | Kevin Wolf | QDict *dict; |
1554 | 294cc35f | Kevin Wolf | |
1555 | 294cc35f | Kevin Wolf | res = qobject_from_jsonf("{ 'stats': {"
|
1556 | 294cc35f | Kevin Wolf | "'rd_bytes': %" PRId64 "," |
1557 | 294cc35f | Kevin Wolf | "'wr_bytes': %" PRId64 "," |
1558 | 294cc35f | Kevin Wolf | "'rd_operations': %" PRId64 "," |
1559 | 294cc35f | Kevin Wolf | "'wr_operations': %" PRId64 "," |
1560 | 294cc35f | Kevin Wolf | "'wr_highest_offset': %" PRId64
|
1561 | 294cc35f | Kevin Wolf | "} }",
|
1562 | 294cc35f | Kevin Wolf | bs->rd_bytes, bs->wr_bytes, |
1563 | 294cc35f | Kevin Wolf | bs->rd_ops, bs->wr_ops, |
1564 | 294cc35f | Kevin Wolf | bs->wr_highest_sector * 512);
|
1565 | 294cc35f | Kevin Wolf | dict = qobject_to_qdict(res); |
1566 | 294cc35f | Kevin Wolf | |
1567 | 294cc35f | Kevin Wolf | if (*bs->device_name) {
|
1568 | 294cc35f | Kevin Wolf | qdict_put(dict, "device", qstring_from_str(bs->device_name));
|
1569 | 294cc35f | Kevin Wolf | } |
1570 | 294cc35f | Kevin Wolf | |
1571 | 294cc35f | Kevin Wolf | if (bs->file) {
|
1572 | 294cc35f | Kevin Wolf | QObject *parent = bdrv_info_stats_bs(bs->file); |
1573 | 294cc35f | Kevin Wolf | qdict_put_obj(dict, "parent", parent);
|
1574 | 294cc35f | Kevin Wolf | } |
1575 | 294cc35f | Kevin Wolf | |
1576 | 294cc35f | Kevin Wolf | return res;
|
1577 | 294cc35f | Kevin Wolf | } |
1578 | 294cc35f | Kevin Wolf | |
1579 | 218a536a | Luiz Capitulino | /**
|
1580 | 218a536a | Luiz Capitulino | * bdrv_info_stats(): show block device statistics
|
1581 | 218a536a | Luiz Capitulino | *
|
1582 | 218a536a | Luiz Capitulino | * Each device statistic information is stored in a QDict and
|
1583 | 218a536a | Luiz Capitulino | * the returned QObject is a QList of all devices.
|
1584 | 218a536a | Luiz Capitulino | *
|
1585 | 218a536a | Luiz Capitulino | * The QDict contains the following:
|
1586 | 218a536a | Luiz Capitulino | *
|
1587 | 218a536a | Luiz Capitulino | * - "device": device name
|
1588 | 218a536a | Luiz Capitulino | * - "stats": A QDict with the statistics information, it contains:
|
1589 | 218a536a | Luiz Capitulino | * - "rd_bytes": bytes read
|
1590 | 218a536a | Luiz Capitulino | * - "wr_bytes": bytes written
|
1591 | 218a536a | Luiz Capitulino | * - "rd_operations": read operations
|
1592 | 218a536a | Luiz Capitulino | * - "wr_operations": write operations
|
1593 | 294cc35f | Kevin Wolf | * - "wr_highest_offset": Highest offset of a sector written since the
|
1594 | 294cc35f | Kevin Wolf | * BlockDriverState has been opened
|
1595 | 21955137 | Daniel P. Berrange | * - "parent": A QDict recursively holding the statistics of the underlying
|
1596 | 21955137 | Daniel P. Berrange | * protocol (e.g. the host file for a qcow2 image). If there is no
|
1597 | 21955137 | Daniel P. Berrange | * underlying protocol, this field is omitted.
|
1598 | 294cc35f | Kevin Wolf | *
|
1599 | 218a536a | Luiz Capitulino | * Example:
|
1600 | 218a536a | Luiz Capitulino | *
|
1601 | 218a536a | Luiz Capitulino | * [ { "device": "ide0-hd0",
|
1602 | 218a536a | Luiz Capitulino | * "stats": { "rd_bytes": 512,
|
1603 | 218a536a | Luiz Capitulino | * "wr_bytes": 0,
|
1604 | 218a536a | Luiz Capitulino | * "rd_operations": 1,
|
1605 | 294cc35f | Kevin Wolf | * "wr_operations": 0,
|
1606 | 21955137 | Daniel P. Berrange | * "wr_highest_offset": 0 },
|
1607 | 21955137 | Daniel P. Berrange | * "parent": {
|
1608 | 21955137 | Daniel P. Berrange | * "stats": { "rd_bytes": 1024,
|
1609 | 21955137 | Daniel P. Berrange | * "wr_bytes": 0,
|
1610 | 21955137 | Daniel P. Berrange | * "rd_operations": 2,
|
1611 | 21955137 | Daniel P. Berrange | * "wr_operations": 0,
|
1612 | 21955137 | Daniel P. Berrange | * "wr_highest_offset": 0,
|
1613 | 21955137 | Daniel P. Berrange | * } } },
|
1614 | 218a536a | Luiz Capitulino | * { "device": "ide1-cd0",
|
1615 | 218a536a | Luiz Capitulino | * "stats": { "rd_bytes": 0,
|
1616 | 218a536a | Luiz Capitulino | * "wr_bytes": 0,
|
1617 | 218a536a | Luiz Capitulino | * "rd_operations": 0,
|
1618 | 294cc35f | Kevin Wolf | * "wr_operations": 0,
|
1619 | 294cc35f | Kevin Wolf | * "wr_highest_offset": 0 } },
|
1620 | 218a536a | Luiz Capitulino | */
|
1621 | 218a536a | Luiz Capitulino | void bdrv_info_stats(Monitor *mon, QObject **ret_data)
|
1622 | 218a536a | Luiz Capitulino | { |
1623 | 218a536a | Luiz Capitulino | QObject *obj; |
1624 | 218a536a | Luiz Capitulino | QList *devices; |
1625 | a36e69dd | ths | BlockDriverState *bs; |
1626 | a36e69dd | ths | |
1627 | 218a536a | Luiz Capitulino | devices = qlist_new(); |
1628 | 218a536a | Luiz Capitulino | |
1629 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_FOREACH(bs, &bdrv_states, list) { |
1630 | 294cc35f | Kevin Wolf | obj = bdrv_info_stats_bs(bs); |
1631 | 218a536a | Luiz Capitulino | qlist_append_obj(devices, obj); |
1632 | a36e69dd | ths | } |
1633 | 218a536a | Luiz Capitulino | |
1634 | 218a536a | Luiz Capitulino | *ret_data = QOBJECT(devices); |
1635 | a36e69dd | ths | } |
1636 | ea2384d3 | bellard | |
1637 | 045df330 | aliguori | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1638 | 045df330 | aliguori | { |
1639 | 045df330 | aliguori | if (bs->backing_hd && bs->backing_hd->encrypted)
|
1640 | 045df330 | aliguori | return bs->backing_file;
|
1641 | 045df330 | aliguori | else if (bs->encrypted) |
1642 | 045df330 | aliguori | return bs->filename;
|
1643 | 045df330 | aliguori | else
|
1644 | 045df330 | aliguori | return NULL; |
1645 | 045df330 | aliguori | } |
1646 | 045df330 | aliguori | |
1647 | 5fafdf24 | ths | void bdrv_get_backing_filename(BlockDriverState *bs,
|
1648 | 83f64091 | bellard | char *filename, int filename_size) |
1649 | 83f64091 | bellard | { |
1650 | b783e409 | Kevin Wolf | if (!bs->backing_file) {
|
1651 | 83f64091 | bellard | pstrcpy(filename, filename_size, "");
|
1652 | 83f64091 | bellard | } else {
|
1653 | 83f64091 | bellard | pstrcpy(filename, filename_size, bs->backing_file); |
1654 | 83f64091 | bellard | } |
1655 | 83f64091 | bellard | } |
1656 | 83f64091 | bellard | |
1657 | 5fafdf24 | ths | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1658 | faea38e7 | bellard | const uint8_t *buf, int nb_sectors) |
1659 | faea38e7 | bellard | { |
1660 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1661 | faea38e7 | bellard | if (!drv)
|
1662 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1663 | faea38e7 | bellard | if (!drv->bdrv_write_compressed)
|
1664 | faea38e7 | bellard | return -ENOTSUP;
|
1665 | fbb7b4e0 | Kevin Wolf | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1666 | fbb7b4e0 | Kevin Wolf | return -EIO;
|
1667 | a55eb92c | Jan Kiszka | |
1668 | c6d22830 | Jan Kiszka | if (bs->dirty_bitmap) {
|
1669 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1670 | 7cd1e32a | lirans@il.ibm.com | } |
1671 | a55eb92c | Jan Kiszka | |
1672 | faea38e7 | bellard | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1673 | faea38e7 | bellard | } |
1674 | 3b46e624 | ths | |
1675 | faea38e7 | bellard | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1676 | faea38e7 | bellard | { |
1677 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1678 | faea38e7 | bellard | if (!drv)
|
1679 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1680 | faea38e7 | bellard | if (!drv->bdrv_get_info)
|
1681 | faea38e7 | bellard | return -ENOTSUP;
|
1682 | faea38e7 | bellard | memset(bdi, 0, sizeof(*bdi)); |
1683 | faea38e7 | bellard | return drv->bdrv_get_info(bs, bdi);
|
1684 | faea38e7 | bellard | } |
1685 | faea38e7 | bellard | |
1686 | 45566e9c | Christoph Hellwig | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1687 | 45566e9c | Christoph Hellwig | int64_t pos, int size)
|
1688 | 178e08a5 | aliguori | { |
1689 | 178e08a5 | aliguori | BlockDriver *drv = bs->drv; |
1690 | 178e08a5 | aliguori | if (!drv)
|
1691 | 178e08a5 | aliguori | return -ENOMEDIUM;
|
1692 | 45566e9c | Christoph Hellwig | if (!drv->bdrv_save_vmstate)
|
1693 | 178e08a5 | aliguori | return -ENOTSUP;
|
1694 | 45566e9c | Christoph Hellwig | return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1695 | 178e08a5 | aliguori | } |
1696 | 178e08a5 | aliguori | |
1697 | 45566e9c | Christoph Hellwig | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1698 | 45566e9c | Christoph Hellwig | int64_t pos, int size)
|
1699 | 178e08a5 | aliguori | { |
1700 | 178e08a5 | aliguori | BlockDriver *drv = bs->drv; |
1701 | 178e08a5 | aliguori | if (!drv)
|
1702 | 178e08a5 | aliguori | return -ENOMEDIUM;
|
1703 | 45566e9c | Christoph Hellwig | if (!drv->bdrv_load_vmstate)
|
1704 | 178e08a5 | aliguori | return -ENOTSUP;
|
1705 | 45566e9c | Christoph Hellwig | return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1706 | 178e08a5 | aliguori | } |
1707 | 178e08a5 | aliguori | |
1708 | 8b9b0cc2 | Kevin Wolf | void bdrv_debug_event(BlockDriverState *bs, BlkDebugEvent event)
|
1709 | 8b9b0cc2 | Kevin Wolf | { |
1710 | 8b9b0cc2 | Kevin Wolf | BlockDriver *drv = bs->drv; |
1711 | 8b9b0cc2 | Kevin Wolf | |
1712 | 8b9b0cc2 | Kevin Wolf | if (!drv || !drv->bdrv_debug_event) {
|
1713 | 8b9b0cc2 | Kevin Wolf | return;
|
1714 | 8b9b0cc2 | Kevin Wolf | } |
1715 | 8b9b0cc2 | Kevin Wolf | |
1716 | 8b9b0cc2 | Kevin Wolf | return drv->bdrv_debug_event(bs, event);
|
1717 | 8b9b0cc2 | Kevin Wolf | |
1718 | 8b9b0cc2 | Kevin Wolf | } |
1719 | 8b9b0cc2 | Kevin Wolf | |
1720 | faea38e7 | bellard | /**************************************************************/
|
1721 | faea38e7 | bellard | /* handling of snapshots */
|
1722 | faea38e7 | bellard | |
1723 | 5fafdf24 | ths | int bdrv_snapshot_create(BlockDriverState *bs,
|
1724 | faea38e7 | bellard | QEMUSnapshotInfo *sn_info) |
1725 | faea38e7 | bellard | { |
1726 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1727 | faea38e7 | bellard | if (!drv)
|
1728 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1729 | faea38e7 | bellard | if (!drv->bdrv_snapshot_create)
|
1730 | faea38e7 | bellard | return -ENOTSUP;
|
1731 | faea38e7 | bellard | return drv->bdrv_snapshot_create(bs, sn_info);
|
1732 | faea38e7 | bellard | } |
1733 | faea38e7 | bellard | |
1734 | 5fafdf24 | ths | int bdrv_snapshot_goto(BlockDriverState *bs,
|
1735 | faea38e7 | bellard | const char *snapshot_id) |
1736 | faea38e7 | bellard | { |
1737 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1738 | faea38e7 | bellard | if (!drv)
|
1739 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1740 | faea38e7 | bellard | if (!drv->bdrv_snapshot_goto)
|
1741 | faea38e7 | bellard | return -ENOTSUP;
|
1742 | faea38e7 | bellard | return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1743 | faea38e7 | bellard | } |
1744 | faea38e7 | bellard | |
1745 | faea38e7 | bellard | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1746 | faea38e7 | bellard | { |
1747 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1748 | faea38e7 | bellard | if (!drv)
|
1749 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1750 | faea38e7 | bellard | if (!drv->bdrv_snapshot_delete)
|
1751 | faea38e7 | bellard | return -ENOTSUP;
|
1752 | faea38e7 | bellard | return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1753 | faea38e7 | bellard | } |
1754 | faea38e7 | bellard | |
1755 | 5fafdf24 | ths | int bdrv_snapshot_list(BlockDriverState *bs,
|
1756 | faea38e7 | bellard | QEMUSnapshotInfo **psn_info) |
1757 | faea38e7 | bellard | { |
1758 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1759 | faea38e7 | bellard | if (!drv)
|
1760 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1761 | faea38e7 | bellard | if (!drv->bdrv_snapshot_list)
|
1762 | faea38e7 | bellard | return -ENOTSUP;
|
1763 | faea38e7 | bellard | return drv->bdrv_snapshot_list(bs, psn_info);
|
1764 | faea38e7 | bellard | } |
1765 | faea38e7 | bellard | |
1766 | faea38e7 | bellard | #define NB_SUFFIXES 4 |
1767 | faea38e7 | bellard | |
1768 | faea38e7 | bellard | char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1769 | faea38e7 | bellard | { |
1770 | faea38e7 | bellard | static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1771 | faea38e7 | bellard | int64_t base; |
1772 | faea38e7 | bellard | int i;
|
1773 | faea38e7 | bellard | |
1774 | faea38e7 | bellard | if (size <= 999) { |
1775 | faea38e7 | bellard | snprintf(buf, buf_size, "%" PRId64, size);
|
1776 | faea38e7 | bellard | } else {
|
1777 | faea38e7 | bellard | base = 1024;
|
1778 | faea38e7 | bellard | for(i = 0; i < NB_SUFFIXES; i++) { |
1779 | faea38e7 | bellard | if (size < (10 * base)) { |
1780 | 5fafdf24 | ths | snprintf(buf, buf_size, "%0.1f%c",
|
1781 | faea38e7 | bellard | (double)size / base,
|
1782 | faea38e7 | bellard | suffixes[i]); |
1783 | faea38e7 | bellard | break;
|
1784 | faea38e7 | bellard | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1785 | 5fafdf24 | ths | snprintf(buf, buf_size, "%" PRId64 "%c", |
1786 | faea38e7 | bellard | ((size + (base >> 1)) / base),
|
1787 | faea38e7 | bellard | suffixes[i]); |
1788 | faea38e7 | bellard | break;
|
1789 | faea38e7 | bellard | } |
1790 | faea38e7 | bellard | base = base * 1024;
|
1791 | faea38e7 | bellard | } |
1792 | faea38e7 | bellard | } |
1793 | faea38e7 | bellard | return buf;
|
1794 | faea38e7 | bellard | } |
1795 | faea38e7 | bellard | |
1796 | faea38e7 | bellard | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1797 | faea38e7 | bellard | { |
1798 | faea38e7 | bellard | char buf1[128], date_buf[128], clock_buf[128]; |
1799 | 3b9f94e1 | bellard | #ifdef _WIN32
|
1800 | 3b9f94e1 | bellard | struct tm *ptm;
|
1801 | 3b9f94e1 | bellard | #else
|
1802 | faea38e7 | bellard | struct tm tm;
|
1803 | 3b9f94e1 | bellard | #endif
|
1804 | faea38e7 | bellard | time_t ti; |
1805 | faea38e7 | bellard | int64_t secs; |
1806 | faea38e7 | bellard | |
1807 | faea38e7 | bellard | if (!sn) {
|
1808 | 5fafdf24 | ths | snprintf(buf, buf_size, |
1809 | 5fafdf24 | ths | "%-10s%-20s%7s%20s%15s",
|
1810 | faea38e7 | bellard | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1811 | faea38e7 | bellard | } else {
|
1812 | faea38e7 | bellard | ti = sn->date_sec; |
1813 | 3b9f94e1 | bellard | #ifdef _WIN32
|
1814 | 3b9f94e1 | bellard | ptm = localtime(&ti); |
1815 | 3b9f94e1 | bellard | strftime(date_buf, sizeof(date_buf),
|
1816 | 3b9f94e1 | bellard | "%Y-%m-%d %H:%M:%S", ptm);
|
1817 | 3b9f94e1 | bellard | #else
|
1818 | faea38e7 | bellard | localtime_r(&ti, &tm); |
1819 | faea38e7 | bellard | strftime(date_buf, sizeof(date_buf),
|
1820 | faea38e7 | bellard | "%Y-%m-%d %H:%M:%S", &tm);
|
1821 | 3b9f94e1 | bellard | #endif
|
1822 | faea38e7 | bellard | secs = sn->vm_clock_nsec / 1000000000;
|
1823 | faea38e7 | bellard | snprintf(clock_buf, sizeof(clock_buf),
|
1824 | faea38e7 | bellard | "%02d:%02d:%02d.%03d",
|
1825 | faea38e7 | bellard | (int)(secs / 3600), |
1826 | faea38e7 | bellard | (int)((secs / 60) % 60), |
1827 | 5fafdf24 | ths | (int)(secs % 60), |
1828 | faea38e7 | bellard | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1829 | faea38e7 | bellard | snprintf(buf, buf_size, |
1830 | 5fafdf24 | ths | "%-10s%-20s%7s%20s%15s",
|
1831 | faea38e7 | bellard | sn->id_str, sn->name, |
1832 | faea38e7 | bellard | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1833 | faea38e7 | bellard | date_buf, |
1834 | faea38e7 | bellard | clock_buf); |
1835 | faea38e7 | bellard | } |
1836 | faea38e7 | bellard | return buf;
|
1837 | faea38e7 | bellard | } |
1838 | faea38e7 | bellard | |
1839 | 83f64091 | bellard | |
1840 | ea2384d3 | bellard | /**************************************************************/
|
1841 | 83f64091 | bellard | /* async I/Os */
|
1842 | ea2384d3 | bellard | |
1843 | 3b69e4b9 | aliguori | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1844 | f141eafe | aliguori | QEMUIOVector *qiov, int nb_sectors,
|
1845 | 3b69e4b9 | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1846 | 3b69e4b9 | aliguori | { |
1847 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
1848 | a36e69dd | ths | BlockDriverAIOCB *ret; |
1849 | 83f64091 | bellard | |
1850 | 19cb3738 | bellard | if (!drv)
|
1851 | ce1a14dc | pbrook | return NULL; |
1852 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1853 | 71d0770c | aliguori | return NULL; |
1854 | 3b46e624 | ths | |
1855 | f141eafe | aliguori | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1856 | f141eafe | aliguori | cb, opaque); |
1857 | a36e69dd | ths | |
1858 | a36e69dd | ths | if (ret) {
|
1859 | a36e69dd | ths | /* Update stats even though technically transfer has not happened. */
|
1860 | 6ea44308 | Jan Kiszka | bs->rd_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1861 | a36e69dd | ths | bs->rd_ops ++; |
1862 | a36e69dd | ths | } |
1863 | a36e69dd | ths | |
1864 | a36e69dd | ths | return ret;
|
1865 | ea2384d3 | bellard | } |
1866 | ea2384d3 | bellard | |
1867 | f141eafe | aliguori | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1868 | f141eafe | aliguori | QEMUIOVector *qiov, int nb_sectors,
|
1869 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1870 | ea2384d3 | bellard | { |
1871 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
1872 | a36e69dd | ths | BlockDriverAIOCB *ret; |
1873 | ea2384d3 | bellard | |
1874 | 19cb3738 | bellard | if (!drv)
|
1875 | ce1a14dc | pbrook | return NULL; |
1876 | 83f64091 | bellard | if (bs->read_only)
|
1877 | ce1a14dc | pbrook | return NULL; |
1878 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1879 | 71d0770c | aliguori | return NULL; |
1880 | 83f64091 | bellard | |
1881 | c6d22830 | Jan Kiszka | if (bs->dirty_bitmap) {
|
1882 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1883 | 7cd1e32a | lirans@il.ibm.com | } |
1884 | a55eb92c | Jan Kiszka | |
1885 | f141eafe | aliguori | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1886 | f141eafe | aliguori | cb, opaque); |
1887 | a36e69dd | ths | |
1888 | a36e69dd | ths | if (ret) {
|
1889 | 294cc35f | Kevin Wolf | /* Update stats even though technically transfer has not happened. */
|
1890 | 294cc35f | Kevin Wolf | bs->wr_bytes += (unsigned) nb_sectors * BDRV_SECTOR_SIZE;
|
1891 | 294cc35f | Kevin Wolf | bs->wr_ops ++; |
1892 | 294cc35f | Kevin Wolf | if (bs->wr_highest_sector < sector_num + nb_sectors - 1) { |
1893 | 294cc35f | Kevin Wolf | bs->wr_highest_sector = sector_num + nb_sectors - 1;
|
1894 | 294cc35f | Kevin Wolf | } |
1895 | a36e69dd | ths | } |
1896 | a36e69dd | ths | |
1897 | a36e69dd | ths | return ret;
|
1898 | 83f64091 | bellard | } |
1899 | 83f64091 | bellard | |
1900 | 40b4f539 | Kevin Wolf | |
1901 | 40b4f539 | Kevin Wolf | typedef struct MultiwriteCB { |
1902 | 40b4f539 | Kevin Wolf | int error;
|
1903 | 40b4f539 | Kevin Wolf | int num_requests;
|
1904 | 40b4f539 | Kevin Wolf | int num_callbacks;
|
1905 | 40b4f539 | Kevin Wolf | struct {
|
1906 | 40b4f539 | Kevin Wolf | BlockDriverCompletionFunc *cb; |
1907 | 40b4f539 | Kevin Wolf | void *opaque;
|
1908 | 40b4f539 | Kevin Wolf | QEMUIOVector *free_qiov; |
1909 | 40b4f539 | Kevin Wolf | void *free_buf;
|
1910 | 40b4f539 | Kevin Wolf | } callbacks[]; |
1911 | 40b4f539 | Kevin Wolf | } MultiwriteCB; |
1912 | 40b4f539 | Kevin Wolf | |
1913 | 40b4f539 | Kevin Wolf | static void multiwrite_user_cb(MultiwriteCB *mcb) |
1914 | 40b4f539 | Kevin Wolf | { |
1915 | 40b4f539 | Kevin Wolf | int i;
|
1916 | 40b4f539 | Kevin Wolf | |
1917 | 40b4f539 | Kevin Wolf | for (i = 0; i < mcb->num_callbacks; i++) { |
1918 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1919 | 1e1ea48d | Stefan Hajnoczi | if (mcb->callbacks[i].free_qiov) {
|
1920 | 1e1ea48d | Stefan Hajnoczi | qemu_iovec_destroy(mcb->callbacks[i].free_qiov); |
1921 | 1e1ea48d | Stefan Hajnoczi | } |
1922 | 40b4f539 | Kevin Wolf | qemu_free(mcb->callbacks[i].free_qiov); |
1923 | f8a83245 | Herve Poussineau | qemu_vfree(mcb->callbacks[i].free_buf); |
1924 | 40b4f539 | Kevin Wolf | } |
1925 | 40b4f539 | Kevin Wolf | } |
1926 | 40b4f539 | Kevin Wolf | |
1927 | 40b4f539 | Kevin Wolf | static void multiwrite_cb(void *opaque, int ret) |
1928 | 40b4f539 | Kevin Wolf | { |
1929 | 40b4f539 | Kevin Wolf | MultiwriteCB *mcb = opaque; |
1930 | 40b4f539 | Kevin Wolf | |
1931 | cb6d3ca0 | Kevin Wolf | if (ret < 0 && !mcb->error) { |
1932 | 40b4f539 | Kevin Wolf | mcb->error = ret; |
1933 | 40b4f539 | Kevin Wolf | multiwrite_user_cb(mcb); |
1934 | 40b4f539 | Kevin Wolf | } |
1935 | 40b4f539 | Kevin Wolf | |
1936 | 40b4f539 | Kevin Wolf | mcb->num_requests--; |
1937 | 40b4f539 | Kevin Wolf | if (mcb->num_requests == 0) { |
1938 | 40b4f539 | Kevin Wolf | if (mcb->error == 0) { |
1939 | 40b4f539 | Kevin Wolf | multiwrite_user_cb(mcb); |
1940 | 40b4f539 | Kevin Wolf | } |
1941 | 40b4f539 | Kevin Wolf | qemu_free(mcb); |
1942 | 40b4f539 | Kevin Wolf | } |
1943 | 40b4f539 | Kevin Wolf | } |
1944 | 40b4f539 | Kevin Wolf | |
1945 | 40b4f539 | Kevin Wolf | static int multiwrite_req_compare(const void *a, const void *b) |
1946 | 40b4f539 | Kevin Wolf | { |
1947 | 77be4366 | Christoph Hellwig | const BlockRequest *req1 = a, *req2 = b;
|
1948 | 77be4366 | Christoph Hellwig | |
1949 | 77be4366 | Christoph Hellwig | /*
|
1950 | 77be4366 | Christoph Hellwig | * Note that we can't simply subtract req2->sector from req1->sector
|
1951 | 77be4366 | Christoph Hellwig | * here as that could overflow the return value.
|
1952 | 77be4366 | Christoph Hellwig | */
|
1953 | 77be4366 | Christoph Hellwig | if (req1->sector > req2->sector) {
|
1954 | 77be4366 | Christoph Hellwig | return 1; |
1955 | 77be4366 | Christoph Hellwig | } else if (req1->sector < req2->sector) { |
1956 | 77be4366 | Christoph Hellwig | return -1; |
1957 | 77be4366 | Christoph Hellwig | } else {
|
1958 | 77be4366 | Christoph Hellwig | return 0; |
1959 | 77be4366 | Christoph Hellwig | } |
1960 | 40b4f539 | Kevin Wolf | } |
1961 | 40b4f539 | Kevin Wolf | |
1962 | 40b4f539 | Kevin Wolf | /*
|
1963 | 40b4f539 | Kevin Wolf | * Takes a bunch of requests and tries to merge them. Returns the number of
|
1964 | 40b4f539 | Kevin Wolf | * requests that remain after merging.
|
1965 | 40b4f539 | Kevin Wolf | */
|
1966 | 40b4f539 | Kevin Wolf | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1967 | 40b4f539 | Kevin Wolf | int num_reqs, MultiwriteCB *mcb)
|
1968 | 40b4f539 | Kevin Wolf | { |
1969 | 40b4f539 | Kevin Wolf | int i, outidx;
|
1970 | 40b4f539 | Kevin Wolf | |
1971 | 40b4f539 | Kevin Wolf | // Sort requests by start sector
|
1972 | 40b4f539 | Kevin Wolf | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1973 | 40b4f539 | Kevin Wolf | |
1974 | 40b4f539 | Kevin Wolf | // Check if adjacent requests touch the same clusters. If so, combine them,
|
1975 | 40b4f539 | Kevin Wolf | // filling up gaps with zero sectors.
|
1976 | 40b4f539 | Kevin Wolf | outidx = 0;
|
1977 | 40b4f539 | Kevin Wolf | for (i = 1; i < num_reqs; i++) { |
1978 | 40b4f539 | Kevin Wolf | int merge = 0; |
1979 | 40b4f539 | Kevin Wolf | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1980 | 40b4f539 | Kevin Wolf | |
1981 | 40b4f539 | Kevin Wolf | // This handles the cases that are valid for all block drivers, namely
|
1982 | 40b4f539 | Kevin Wolf | // exactly sequential writes and overlapping writes.
|
1983 | 40b4f539 | Kevin Wolf | if (reqs[i].sector <= oldreq_last) {
|
1984 | 40b4f539 | Kevin Wolf | merge = 1;
|
1985 | 40b4f539 | Kevin Wolf | } |
1986 | 40b4f539 | Kevin Wolf | |
1987 | 40b4f539 | Kevin Wolf | // The block driver may decide that it makes sense to combine requests
|
1988 | 40b4f539 | Kevin Wolf | // even if there is a gap of some sectors between them. In this case,
|
1989 | 40b4f539 | Kevin Wolf | // the gap is filled with zeros (therefore only applicable for yet
|
1990 | 40b4f539 | Kevin Wolf | // unused space in format like qcow2).
|
1991 | 40b4f539 | Kevin Wolf | if (!merge && bs->drv->bdrv_merge_requests) {
|
1992 | 40b4f539 | Kevin Wolf | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1993 | 40b4f539 | Kevin Wolf | } |
1994 | 40b4f539 | Kevin Wolf | |
1995 | e2a305fb | Christoph Hellwig | if (reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1 > IOV_MAX) { |
1996 | e2a305fb | Christoph Hellwig | merge = 0;
|
1997 | e2a305fb | Christoph Hellwig | } |
1998 | e2a305fb | Christoph Hellwig | |
1999 | 40b4f539 | Kevin Wolf | if (merge) {
|
2000 | 40b4f539 | Kevin Wolf | size_t size; |
2001 | 40b4f539 | Kevin Wolf | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
2002 | 40b4f539 | Kevin Wolf | qemu_iovec_init(qiov, |
2003 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
2004 | 40b4f539 | Kevin Wolf | |
2005 | 40b4f539 | Kevin Wolf | // Add the first request to the merged one. If the requests are
|
2006 | 40b4f539 | Kevin Wolf | // overlapping, drop the last sectors of the first request.
|
2007 | 40b4f539 | Kevin Wolf | size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
2008 | 40b4f539 | Kevin Wolf | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
2009 | 40b4f539 | Kevin Wolf | |
2010 | 40b4f539 | Kevin Wolf | // We might need to add some zeros between the two requests
|
2011 | 40b4f539 | Kevin Wolf | if (reqs[i].sector > oldreq_last) {
|
2012 | 40b4f539 | Kevin Wolf | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
2013 | 40b4f539 | Kevin Wolf | uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
2014 | 40b4f539 | Kevin Wolf | memset(buf, 0, zero_bytes);
|
2015 | 40b4f539 | Kevin Wolf | qemu_iovec_add(qiov, buf, zero_bytes); |
2016 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].free_buf = buf; |
2017 | 40b4f539 | Kevin Wolf | } |
2018 | 40b4f539 | Kevin Wolf | |
2019 | 40b4f539 | Kevin Wolf | // Add the second request
|
2020 | 40b4f539 | Kevin Wolf | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
2021 | 40b4f539 | Kevin Wolf | |
2022 | 40b4f539 | Kevin Wolf | reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
2023 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov = qiov; |
2024 | 40b4f539 | Kevin Wolf | |
2025 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
2026 | 40b4f539 | Kevin Wolf | } else {
|
2027 | 40b4f539 | Kevin Wolf | outidx++; |
2028 | 40b4f539 | Kevin Wolf | reqs[outidx].sector = reqs[i].sector; |
2029 | 40b4f539 | Kevin Wolf | reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
2030 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov = reqs[i].qiov; |
2031 | 40b4f539 | Kevin Wolf | } |
2032 | 40b4f539 | Kevin Wolf | } |
2033 | 40b4f539 | Kevin Wolf | |
2034 | 40b4f539 | Kevin Wolf | return outidx + 1; |
2035 | 40b4f539 | Kevin Wolf | } |
2036 | 40b4f539 | Kevin Wolf | |
2037 | 40b4f539 | Kevin Wolf | /*
|
2038 | 40b4f539 | Kevin Wolf | * Submit multiple AIO write requests at once.
|
2039 | 40b4f539 | Kevin Wolf | *
|
2040 | 40b4f539 | Kevin Wolf | * On success, the function returns 0 and all requests in the reqs array have
|
2041 | 40b4f539 | Kevin Wolf | * been submitted. In error case this function returns -1, and any of the
|
2042 | 40b4f539 | Kevin Wolf | * requests may or may not be submitted yet. In particular, this means that the
|
2043 | 40b4f539 | Kevin Wolf | * callback will be called for some of the requests, for others it won't. The
|
2044 | 40b4f539 | Kevin Wolf | * caller must check the error field of the BlockRequest to wait for the right
|
2045 | 40b4f539 | Kevin Wolf | * callbacks (if error != 0, no callback will be called).
|
2046 | 40b4f539 | Kevin Wolf | *
|
2047 | 40b4f539 | Kevin Wolf | * The implementation may modify the contents of the reqs array, e.g. to merge
|
2048 | 40b4f539 | Kevin Wolf | * requests. However, the fields opaque and error are left unmodified as they
|
2049 | 40b4f539 | Kevin Wolf | * are used to signal failure for a single request to the caller.
|
2050 | 40b4f539 | Kevin Wolf | */
|
2051 | 40b4f539 | Kevin Wolf | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
2052 | 40b4f539 | Kevin Wolf | { |
2053 | 40b4f539 | Kevin Wolf | BlockDriverAIOCB *acb; |
2054 | 40b4f539 | Kevin Wolf | MultiwriteCB *mcb; |
2055 | 40b4f539 | Kevin Wolf | int i;
|
2056 | 40b4f539 | Kevin Wolf | |
2057 | 40b4f539 | Kevin Wolf | if (num_reqs == 0) { |
2058 | 40b4f539 | Kevin Wolf | return 0; |
2059 | 40b4f539 | Kevin Wolf | } |
2060 | 40b4f539 | Kevin Wolf | |
2061 | 40b4f539 | Kevin Wolf | // Create MultiwriteCB structure
|
2062 | 40b4f539 | Kevin Wolf | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
2063 | 40b4f539 | Kevin Wolf | mcb->num_requests = 0;
|
2064 | 40b4f539 | Kevin Wolf | mcb->num_callbacks = num_reqs; |
2065 | 40b4f539 | Kevin Wolf | |
2066 | 40b4f539 | Kevin Wolf | for (i = 0; i < num_reqs; i++) { |
2067 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].cb = reqs[i].cb; |
2068 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].opaque = reqs[i].opaque; |
2069 | 40b4f539 | Kevin Wolf | } |
2070 | 40b4f539 | Kevin Wolf | |
2071 | 40b4f539 | Kevin Wolf | // Check for mergable requests
|
2072 | 40b4f539 | Kevin Wolf | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
2073 | 40b4f539 | Kevin Wolf | |
2074 | 40b4f539 | Kevin Wolf | // Run the aio requests
|
2075 | 40b4f539 | Kevin Wolf | for (i = 0; i < num_reqs; i++) { |
2076 | 40b4f539 | Kevin Wolf | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
2077 | 40b4f539 | Kevin Wolf | reqs[i].nb_sectors, multiwrite_cb, mcb); |
2078 | 40b4f539 | Kevin Wolf | |
2079 | 40b4f539 | Kevin Wolf | if (acb == NULL) { |
2080 | 40b4f539 | Kevin Wolf | // We can only fail the whole thing if no request has been
|
2081 | 40b4f539 | Kevin Wolf | // submitted yet. Otherwise we'll wait for the submitted AIOs to
|
2082 | 40b4f539 | Kevin Wolf | // complete and report the error in the callback.
|
2083 | 40b4f539 | Kevin Wolf | if (mcb->num_requests == 0) { |
2084 | 0f0b604b | Kevin Wolf | reqs[i].error = -EIO; |
2085 | 40b4f539 | Kevin Wolf | goto fail;
|
2086 | 40b4f539 | Kevin Wolf | } else {
|
2087 | 7eb58a6c | Kevin Wolf | mcb->num_requests++; |
2088 | 7eb58a6c | Kevin Wolf | multiwrite_cb(mcb, -EIO); |
2089 | 40b4f539 | Kevin Wolf | break;
|
2090 | 40b4f539 | Kevin Wolf | } |
2091 | 40b4f539 | Kevin Wolf | } else {
|
2092 | 40b4f539 | Kevin Wolf | mcb->num_requests++; |
2093 | 40b4f539 | Kevin Wolf | } |
2094 | 40b4f539 | Kevin Wolf | } |
2095 | 40b4f539 | Kevin Wolf | |
2096 | 40b4f539 | Kevin Wolf | return 0; |
2097 | 40b4f539 | Kevin Wolf | |
2098 | 40b4f539 | Kevin Wolf | fail:
|
2099 | af474591 | Bruce Rogers | qemu_free(mcb); |
2100 | 40b4f539 | Kevin Wolf | return -1; |
2101 | 40b4f539 | Kevin Wolf | } |
2102 | 40b4f539 | Kevin Wolf | |
2103 | b2e12bc6 | Christoph Hellwig | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
2104 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
2105 | b2e12bc6 | Christoph Hellwig | { |
2106 | b2e12bc6 | Christoph Hellwig | BlockDriver *drv = bs->drv; |
2107 | b2e12bc6 | Christoph Hellwig | |
2108 | 016f5cf6 | Alexander Graf | if (bs->open_flags & BDRV_O_NO_FLUSH) {
|
2109 | 016f5cf6 | Alexander Graf | return bdrv_aio_noop_em(bs, cb, opaque);
|
2110 | 016f5cf6 | Alexander Graf | } |
2111 | 016f5cf6 | Alexander Graf | |
2112 | b2e12bc6 | Christoph Hellwig | if (!drv)
|
2113 | b2e12bc6 | Christoph Hellwig | return NULL; |
2114 | b2e12bc6 | Christoph Hellwig | return drv->bdrv_aio_flush(bs, cb, opaque);
|
2115 | b2e12bc6 | Christoph Hellwig | } |
2116 | b2e12bc6 | Christoph Hellwig | |
2117 | 83f64091 | bellard | void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
2118 | 83f64091 | bellard | { |
2119 | 6bbff9a0 | aliguori | acb->pool->cancel(acb); |
2120 | 83f64091 | bellard | } |
2121 | 83f64091 | bellard | |
2122 | ce1a14dc | pbrook | |
2123 | 83f64091 | bellard | /**************************************************************/
|
2124 | 83f64091 | bellard | /* async block device emulation */
|
2125 | 83f64091 | bellard | |
2126 | c16b5a2c | Christoph Hellwig | typedef struct BlockDriverAIOCBSync { |
2127 | c16b5a2c | Christoph Hellwig | BlockDriverAIOCB common; |
2128 | c16b5a2c | Christoph Hellwig | QEMUBH *bh; |
2129 | c16b5a2c | Christoph Hellwig | int ret;
|
2130 | c16b5a2c | Christoph Hellwig | /* vector translation state */
|
2131 | c16b5a2c | Christoph Hellwig | QEMUIOVector *qiov; |
2132 | c16b5a2c | Christoph Hellwig | uint8_t *bounce; |
2133 | c16b5a2c | Christoph Hellwig | int is_write;
|
2134 | c16b5a2c | Christoph Hellwig | } BlockDriverAIOCBSync; |
2135 | c16b5a2c | Christoph Hellwig | |
2136 | c16b5a2c | Christoph Hellwig | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
2137 | c16b5a2c | Christoph Hellwig | { |
2138 | b666d239 | Kevin Wolf | BlockDriverAIOCBSync *acb = |
2139 | b666d239 | Kevin Wolf | container_of(blockacb, BlockDriverAIOCBSync, common); |
2140 | 6a7ad299 | Dor Laor | qemu_bh_delete(acb->bh); |
2141 | 36afc451 | Avi Kivity | acb->bh = NULL;
|
2142 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
2143 | c16b5a2c | Christoph Hellwig | } |
2144 | c16b5a2c | Christoph Hellwig | |
2145 | c16b5a2c | Christoph Hellwig | static AIOPool bdrv_em_aio_pool = {
|
2146 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(BlockDriverAIOCBSync),
|
2147 | c16b5a2c | Christoph Hellwig | .cancel = bdrv_aio_cancel_em, |
2148 | c16b5a2c | Christoph Hellwig | }; |
2149 | c16b5a2c | Christoph Hellwig | |
2150 | ce1a14dc | pbrook | static void bdrv_aio_bh_cb(void *opaque) |
2151 | 83f64091 | bellard | { |
2152 | ce1a14dc | pbrook | BlockDriverAIOCBSync *acb = opaque; |
2153 | f141eafe | aliguori | |
2154 | f141eafe | aliguori | if (!acb->is_write)
|
2155 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
2156 | ceb42de8 | aliguori | qemu_vfree(acb->bounce); |
2157 | ce1a14dc | pbrook | acb->common.cb(acb->common.opaque, acb->ret); |
2158 | 6a7ad299 | Dor Laor | qemu_bh_delete(acb->bh); |
2159 | 36afc451 | Avi Kivity | acb->bh = NULL;
|
2160 | ce1a14dc | pbrook | qemu_aio_release(acb); |
2161 | 83f64091 | bellard | } |
2162 | beac80cd | bellard | |
2163 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
2164 | f141eafe | aliguori | int64_t sector_num, |
2165 | f141eafe | aliguori | QEMUIOVector *qiov, |
2166 | f141eafe | aliguori | int nb_sectors,
|
2167 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, |
2168 | f141eafe | aliguori | void *opaque,
|
2169 | f141eafe | aliguori | int is_write)
|
2170 | f141eafe | aliguori | |
2171 | 83f64091 | bellard | { |
2172 | ce1a14dc | pbrook | BlockDriverAIOCBSync *acb; |
2173 | ce1a14dc | pbrook | |
2174 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2175 | f141eafe | aliguori | acb->is_write = is_write; |
2176 | f141eafe | aliguori | acb->qiov = qiov; |
2177 | e268ca52 | aliguori | acb->bounce = qemu_blockalign(bs, qiov->size); |
2178 | f141eafe | aliguori | |
2179 | ce1a14dc | pbrook | if (!acb->bh)
|
2180 | ce1a14dc | pbrook | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2181 | f141eafe | aliguori | |
2182 | f141eafe | aliguori | if (is_write) {
|
2183 | f141eafe | aliguori | qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
2184 | f141eafe | aliguori | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
2185 | f141eafe | aliguori | } else {
|
2186 | f141eafe | aliguori | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
2187 | f141eafe | aliguori | } |
2188 | f141eafe | aliguori | |
2189 | ce1a14dc | pbrook | qemu_bh_schedule(acb->bh); |
2190 | f141eafe | aliguori | |
2191 | ce1a14dc | pbrook | return &acb->common;
|
2192 | beac80cd | bellard | } |
2193 | beac80cd | bellard | |
2194 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
2195 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2196 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
2197 | beac80cd | bellard | { |
2198 | f141eafe | aliguori | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
2199 | f141eafe | aliguori | } |
2200 | 83f64091 | bellard | |
2201 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
2202 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
2203 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
2204 | f141eafe | aliguori | { |
2205 | f141eafe | aliguori | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
2206 | beac80cd | bellard | } |
2207 | beac80cd | bellard | |
2208 | b2e12bc6 | Christoph Hellwig | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
2209 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
2210 | b2e12bc6 | Christoph Hellwig | { |
2211 | b2e12bc6 | Christoph Hellwig | BlockDriverAIOCBSync *acb; |
2212 | b2e12bc6 | Christoph Hellwig | |
2213 | b2e12bc6 | Christoph Hellwig | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2214 | b2e12bc6 | Christoph Hellwig | acb->is_write = 1; /* don't bounce in the completion hadler */ |
2215 | b2e12bc6 | Christoph Hellwig | acb->qiov = NULL;
|
2216 | b2e12bc6 | Christoph Hellwig | acb->bounce = NULL;
|
2217 | b2e12bc6 | Christoph Hellwig | acb->ret = 0;
|
2218 | b2e12bc6 | Christoph Hellwig | |
2219 | b2e12bc6 | Christoph Hellwig | if (!acb->bh)
|
2220 | b2e12bc6 | Christoph Hellwig | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2221 | b2e12bc6 | Christoph Hellwig | |
2222 | b2e12bc6 | Christoph Hellwig | bdrv_flush(bs); |
2223 | b2e12bc6 | Christoph Hellwig | qemu_bh_schedule(acb->bh); |
2224 | b2e12bc6 | Christoph Hellwig | return &acb->common;
|
2225 | b2e12bc6 | Christoph Hellwig | } |
2226 | b2e12bc6 | Christoph Hellwig | |
2227 | 016f5cf6 | Alexander Graf | static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs,
|
2228 | 016f5cf6 | Alexander Graf | BlockDriverCompletionFunc *cb, void *opaque)
|
2229 | 016f5cf6 | Alexander Graf | { |
2230 | 016f5cf6 | Alexander Graf | BlockDriverAIOCBSync *acb; |
2231 | 016f5cf6 | Alexander Graf | |
2232 | 016f5cf6 | Alexander Graf | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
2233 | 016f5cf6 | Alexander Graf | acb->is_write = 1; /* don't bounce in the completion handler */ |
2234 | 016f5cf6 | Alexander Graf | acb->qiov = NULL;
|
2235 | 016f5cf6 | Alexander Graf | acb->bounce = NULL;
|
2236 | 016f5cf6 | Alexander Graf | acb->ret = 0;
|
2237 | 016f5cf6 | Alexander Graf | |
2238 | 016f5cf6 | Alexander Graf | if (!acb->bh) {
|
2239 | 016f5cf6 | Alexander Graf | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
2240 | 016f5cf6 | Alexander Graf | } |
2241 | 016f5cf6 | Alexander Graf | |
2242 | 016f5cf6 | Alexander Graf | qemu_bh_schedule(acb->bh); |
2243 | 016f5cf6 | Alexander Graf | return &acb->common;
|
2244 | 016f5cf6 | Alexander Graf | } |
2245 | 016f5cf6 | Alexander Graf | |
2246 | 83f64091 | bellard | /**************************************************************/
|
2247 | 83f64091 | bellard | /* sync block device emulation */
|
2248 | ea2384d3 | bellard | |
2249 | 83f64091 | bellard | static void bdrv_rw_em_cb(void *opaque, int ret) |
2250 | 83f64091 | bellard | { |
2251 | 83f64091 | bellard | *(int *)opaque = ret;
|
2252 | ea2384d3 | bellard | } |
2253 | ea2384d3 | bellard | |
2254 | 83f64091 | bellard | #define NOT_DONE 0x7fffffff |
2255 | 83f64091 | bellard | |
2256 | 5fafdf24 | ths | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
2257 | 83f64091 | bellard | uint8_t *buf, int nb_sectors)
|
2258 | 7a6cba61 | pbrook | { |
2259 | ce1a14dc | pbrook | int async_ret;
|
2260 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
2261 | f141eafe | aliguori | struct iovec iov;
|
2262 | f141eafe | aliguori | QEMUIOVector qiov; |
2263 | 83f64091 | bellard | |
2264 | 65d6b3d8 | Kevin Wolf | async_context_push(); |
2265 | 65d6b3d8 | Kevin Wolf | |
2266 | 83f64091 | bellard | async_ret = NOT_DONE; |
2267 | 3f4cb3d3 | blueswir1 | iov.iov_base = (void *)buf;
|
2268 | f141eafe | aliguori | iov.iov_len = nb_sectors * 512;
|
2269 | f141eafe | aliguori | qemu_iovec_init_external(&qiov, &iov, 1);
|
2270 | f141eafe | aliguori | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
2271 | f141eafe | aliguori | bdrv_rw_em_cb, &async_ret); |
2272 | 65d6b3d8 | Kevin Wolf | if (acb == NULL) { |
2273 | 65d6b3d8 | Kevin Wolf | async_ret = -1;
|
2274 | 65d6b3d8 | Kevin Wolf | goto fail;
|
2275 | 65d6b3d8 | Kevin Wolf | } |
2276 | baf35cb9 | aliguori | |
2277 | 83f64091 | bellard | while (async_ret == NOT_DONE) {
|
2278 | 83f64091 | bellard | qemu_aio_wait(); |
2279 | 83f64091 | bellard | } |
2280 | baf35cb9 | aliguori | |
2281 | 65d6b3d8 | Kevin Wolf | |
2282 | 65d6b3d8 | Kevin Wolf | fail:
|
2283 | 65d6b3d8 | Kevin Wolf | async_context_pop(); |
2284 | 83f64091 | bellard | return async_ret;
|
2285 | 7a6cba61 | pbrook | } |
2286 | 7a6cba61 | pbrook | |
2287 | 83f64091 | bellard | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
2288 | 83f64091 | bellard | const uint8_t *buf, int nb_sectors) |
2289 | 83f64091 | bellard | { |
2290 | ce1a14dc | pbrook | int async_ret;
|
2291 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
2292 | f141eafe | aliguori | struct iovec iov;
|
2293 | f141eafe | aliguori | QEMUIOVector qiov; |
2294 | 83f64091 | bellard | |
2295 | 65d6b3d8 | Kevin Wolf | async_context_push(); |
2296 | 65d6b3d8 | Kevin Wolf | |
2297 | 83f64091 | bellard | async_ret = NOT_DONE; |
2298 | f141eafe | aliguori | iov.iov_base = (void *)buf;
|
2299 | f141eafe | aliguori | iov.iov_len = nb_sectors * 512;
|
2300 | f141eafe | aliguori | qemu_iovec_init_external(&qiov, &iov, 1);
|
2301 | f141eafe | aliguori | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
2302 | f141eafe | aliguori | bdrv_rw_em_cb, &async_ret); |
2303 | 65d6b3d8 | Kevin Wolf | if (acb == NULL) { |
2304 | 65d6b3d8 | Kevin Wolf | async_ret = -1;
|
2305 | 65d6b3d8 | Kevin Wolf | goto fail;
|
2306 | 65d6b3d8 | Kevin Wolf | } |
2307 | 83f64091 | bellard | while (async_ret == NOT_DONE) {
|
2308 | 83f64091 | bellard | qemu_aio_wait(); |
2309 | 83f64091 | bellard | } |
2310 | 65d6b3d8 | Kevin Wolf | |
2311 | 65d6b3d8 | Kevin Wolf | fail:
|
2312 | 65d6b3d8 | Kevin Wolf | async_context_pop(); |
2313 | 83f64091 | bellard | return async_ret;
|
2314 | 83f64091 | bellard | } |
2315 | ea2384d3 | bellard | |
2316 | ea2384d3 | bellard | void bdrv_init(void) |
2317 | ea2384d3 | bellard | { |
2318 | 5efa9d5a | Anthony Liguori | module_call_init(MODULE_INIT_BLOCK); |
2319 | ea2384d3 | bellard | } |
2320 | ce1a14dc | pbrook | |
2321 | eb852011 | Markus Armbruster | void bdrv_init_with_whitelist(void) |
2322 | eb852011 | Markus Armbruster | { |
2323 | eb852011 | Markus Armbruster | use_bdrv_whitelist = 1;
|
2324 | eb852011 | Markus Armbruster | bdrv_init(); |
2325 | eb852011 | Markus Armbruster | } |
2326 | eb852011 | Markus Armbruster | |
2327 | c16b5a2c | Christoph Hellwig | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
2328 | c16b5a2c | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
2329 | ce1a14dc | pbrook | { |
2330 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
2331 | ce1a14dc | pbrook | |
2332 | 6bbff9a0 | aliguori | if (pool->free_aiocb) {
|
2333 | 6bbff9a0 | aliguori | acb = pool->free_aiocb; |
2334 | 6bbff9a0 | aliguori | pool->free_aiocb = acb->next; |
2335 | ce1a14dc | pbrook | } else {
|
2336 | 6bbff9a0 | aliguori | acb = qemu_mallocz(pool->aiocb_size); |
2337 | 6bbff9a0 | aliguori | acb->pool = pool; |
2338 | ce1a14dc | pbrook | } |
2339 | ce1a14dc | pbrook | acb->bs = bs; |
2340 | ce1a14dc | pbrook | acb->cb = cb; |
2341 | ce1a14dc | pbrook | acb->opaque = opaque; |
2342 | ce1a14dc | pbrook | return acb;
|
2343 | ce1a14dc | pbrook | } |
2344 | ce1a14dc | pbrook | |
2345 | ce1a14dc | pbrook | void qemu_aio_release(void *p) |
2346 | ce1a14dc | pbrook | { |
2347 | 6bbff9a0 | aliguori | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
2348 | 6bbff9a0 | aliguori | AIOPool *pool = acb->pool; |
2349 | 6bbff9a0 | aliguori | acb->next = pool->free_aiocb; |
2350 | 6bbff9a0 | aliguori | pool->free_aiocb = acb; |
2351 | ce1a14dc | pbrook | } |
2352 | 19cb3738 | bellard | |
2353 | 19cb3738 | bellard | /**************************************************************/
|
2354 | 19cb3738 | bellard | /* removable device support */
|
2355 | 19cb3738 | bellard | |
2356 | 19cb3738 | bellard | /**
|
2357 | 19cb3738 | bellard | * Return TRUE if the media is present
|
2358 | 19cb3738 | bellard | */
|
2359 | 19cb3738 | bellard | int bdrv_is_inserted(BlockDriverState *bs)
|
2360 | 19cb3738 | bellard | { |
2361 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
2362 | 19cb3738 | bellard | int ret;
|
2363 | 19cb3738 | bellard | if (!drv)
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2364 | 19cb3738 | bellard | return 0; |
2365 | 19cb3738 | bellard | if (!drv->bdrv_is_inserted)
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2366 | 19cb3738 | bellard | return 1; |
2367 | 19cb3738 | bellard | ret = drv->bdrv_is_inserted(bs); |
2368 | 19cb3738 | bellard | return ret;
|
2369 | 19cb3738 | bellard | } |
2370 | 19cb3738 | bellard | |
2371 | 19cb3738 | bellard | /**
|
2372 | 19cb3738 | bellard | * Return TRUE if the media changed since the last call to this
|
2373 | 5fafdf24 | ths | * function. It is currently only used for floppy disks
|
2374 | 19cb3738 | bellard | */
|
2375 | 19cb3738 | bellard | int bdrv_media_changed(BlockDriverState *bs)
|
2376 | 19cb3738 | bellard | { |
2377 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
2378 | 19cb3738 | bellard | int ret;
|
2379 | 19cb3738 | bellard | |
2380 | 19cb3738 | bellard | if (!drv || !drv->bdrv_media_changed)
|
2381 | 19cb3738 | bellard | ret = -ENOTSUP; |
2382 | 19cb3738 | bellard | else
|
2383 | 19cb3738 | bellard | ret = drv->bdrv_media_changed(bs); |
2384 | 19cb3738 | bellard | if (ret == -ENOTSUP)
|
2385 | 19cb3738 | bellard | ret = bs->media_changed; |
2386 | 19cb3738 | bellard | bs->media_changed = 0;
|
2387 | 19cb3738 | bellard | return ret;
|
2388 | 19cb3738 | bellard | } |
2389 | 19cb3738 | bellard | |
2390 | 19cb3738 | bellard | /**
|
2391 | 19cb3738 | bellard | * If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
2392 | 19cb3738 | bellard | */
|
2393 | aea2a33c | Mark McLoughlin | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
2394 | 19cb3738 | bellard | { |
2395 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
2396 | 19cb3738 | bellard | int ret;
|
2397 | 19cb3738 | bellard | |
2398 | aea2a33c | Mark McLoughlin | if (bs->locked) {
|
2399 | aea2a33c | Mark McLoughlin | return -EBUSY;
|
2400 | aea2a33c | Mark McLoughlin | } |
2401 | aea2a33c | Mark McLoughlin | |
2402 | 19cb3738 | bellard | if (!drv || !drv->bdrv_eject) {
|
2403 | 19cb3738 | bellard | ret = -ENOTSUP; |
2404 | 19cb3738 | bellard | } else {
|
2405 | 19cb3738 | bellard | ret = drv->bdrv_eject(bs, eject_flag); |
2406 | 19cb3738 | bellard | } |
2407 | 19cb3738 | bellard | if (ret == -ENOTSUP) {
|
2408 | 19cb3738 | bellard | if (eject_flag)
|
2409 | 19cb3738 | bellard | bdrv_close(bs); |
2410 | aea2a33c | Mark McLoughlin | ret = 0;
|
2411 | 19cb3738 | bellard | } |
2412 | aea2a33c | Mark McLoughlin | |
2413 | aea2a33c | Mark McLoughlin | return ret;
|
2414 | 19cb3738 | bellard | } |
2415 | 19cb3738 | bellard | |
2416 | 19cb3738 | bellard | int bdrv_is_locked(BlockDriverState *bs)
|
2417 | 19cb3738 | bellard | { |
2418 | 19cb3738 | bellard | return bs->locked;
|
2419 | 19cb3738 | bellard | } |
2420 | 19cb3738 | bellard | |
2421 | 19cb3738 | bellard | /**
|
2422 | 19cb3738 | bellard | * Lock or unlock the media (if it is locked, the user won't be able
|
2423 | 19cb3738 | bellard | * to eject it manually).
|
2424 | 19cb3738 | bellard | */
|
2425 | 19cb3738 | bellard | void bdrv_set_locked(BlockDriverState *bs, int locked) |
2426 | 19cb3738 | bellard | { |
2427 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
2428 | 19cb3738 | bellard | |
2429 | 19cb3738 | bellard | bs->locked = locked; |
2430 | 19cb3738 | bellard | if (drv && drv->bdrv_set_locked) {
|
2431 | 19cb3738 | bellard | drv->bdrv_set_locked(bs, locked); |
2432 | 19cb3738 | bellard | } |
2433 | 19cb3738 | bellard | } |
2434 | 985a03b0 | ths | |
2435 | 985a03b0 | ths | /* needed for generic scsi interface */
|
2436 | 985a03b0 | ths | |
2437 | 985a03b0 | ths | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
2438 | 985a03b0 | ths | { |
2439 | 985a03b0 | ths | BlockDriver *drv = bs->drv; |
2440 | 985a03b0 | ths | |
2441 | 985a03b0 | ths | if (drv && drv->bdrv_ioctl)
|
2442 | 985a03b0 | ths | return drv->bdrv_ioctl(bs, req, buf);
|
2443 | 985a03b0 | ths | return -ENOTSUP;
|
2444 | 985a03b0 | ths | } |
2445 | 7d780669 | aliguori | |
2446 | 221f715d | aliguori | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
2447 | 221f715d | aliguori | unsigned long int req, void *buf, |
2448 | 221f715d | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
2449 | 7d780669 | aliguori | { |
2450 | 221f715d | aliguori | BlockDriver *drv = bs->drv; |
2451 | 7d780669 | aliguori | |
2452 | 221f715d | aliguori | if (drv && drv->bdrv_aio_ioctl)
|
2453 | 221f715d | aliguori | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
2454 | 221f715d | aliguori | return NULL; |
2455 | 7d780669 | aliguori | } |
2456 | e268ca52 | aliguori | |
2457 | 7cd1e32a | lirans@il.ibm.com | |
2458 | 7cd1e32a | lirans@il.ibm.com | |
2459 | e268ca52 | aliguori | void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
2460 | e268ca52 | aliguori | { |
2461 | e268ca52 | aliguori | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
2462 | e268ca52 | aliguori | } |
2463 | 7cd1e32a | lirans@il.ibm.com | |
2464 | 7cd1e32a | lirans@il.ibm.com | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
2465 | 7cd1e32a | lirans@il.ibm.com | { |
2466 | 7cd1e32a | lirans@il.ibm.com | int64_t bitmap_size; |
2467 | a55eb92c | Jan Kiszka | |
2468 | aaa0eb75 | Liran Schour | bs->dirty_count = 0;
|
2469 | a55eb92c | Jan Kiszka | if (enable) {
|
2470 | c6d22830 | Jan Kiszka | if (!bs->dirty_bitmap) {
|
2471 | c6d22830 | Jan Kiszka | bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) + |
2472 | c6d22830 | Jan Kiszka | BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1; |
2473 | c6d22830 | Jan Kiszka | bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
|
2474 | a55eb92c | Jan Kiszka | |
2475 | 7cd1e32a | lirans@il.ibm.com | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
2476 | a55eb92c | Jan Kiszka | } |
2477 | 7cd1e32a | lirans@il.ibm.com | } else {
|
2478 | c6d22830 | Jan Kiszka | if (bs->dirty_bitmap) {
|
2479 | 7cd1e32a | lirans@il.ibm.com | qemu_free(bs->dirty_bitmap); |
2480 | c6d22830 | Jan Kiszka | bs->dirty_bitmap = NULL;
|
2481 | a55eb92c | Jan Kiszka | } |
2482 | 7cd1e32a | lirans@il.ibm.com | } |
2483 | 7cd1e32a | lirans@il.ibm.com | } |
2484 | 7cd1e32a | lirans@il.ibm.com | |
2485 | 7cd1e32a | lirans@il.ibm.com | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
2486 | 7cd1e32a | lirans@il.ibm.com | { |
2487 | 6ea44308 | Jan Kiszka | int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK; |
2488 | a55eb92c | Jan Kiszka | |
2489 | c6d22830 | Jan Kiszka | if (bs->dirty_bitmap &&
|
2490 | c6d22830 | Jan Kiszka | (sector << BDRV_SECTOR_BITS) < bdrv_getlength(bs)) { |
2491 | c6d22830 | Jan Kiszka | return bs->dirty_bitmap[chunk / (sizeof(unsigned long) * 8)] & |
2492 | c6d22830 | Jan Kiszka | (1 << (chunk % (sizeof(unsigned long) * 8))); |
2493 | 7cd1e32a | lirans@il.ibm.com | } else {
|
2494 | 7cd1e32a | lirans@il.ibm.com | return 0; |
2495 | 7cd1e32a | lirans@il.ibm.com | } |
2496 | 7cd1e32a | lirans@il.ibm.com | } |
2497 | 7cd1e32a | lirans@il.ibm.com | |
2498 | a55eb92c | Jan Kiszka | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2499 | a55eb92c | Jan Kiszka | int nr_sectors)
|
2500 | 7cd1e32a | lirans@il.ibm.com | { |
2501 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2502 | 7cd1e32a | lirans@il.ibm.com | } |
2503 | aaa0eb75 | Liran Schour | |
2504 | aaa0eb75 | Liran Schour | int64_t bdrv_get_dirty_count(BlockDriverState *bs) |
2505 | aaa0eb75 | Liran Schour | { |
2506 | aaa0eb75 | Liran Schour | return bs->dirty_count;
|
2507 | aaa0eb75 | Liran Schour | } |