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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 | fc01f7e7 | bellard | |
30 | 71e72a19 | Juan Quintela | #ifdef CONFIG_BSD
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31 | 7674e7bf | bellard | #include <sys/types.h> |
32 | 7674e7bf | bellard | #include <sys/stat.h> |
33 | 7674e7bf | bellard | #include <sys/ioctl.h> |
34 | 72cf2d4f | Blue Swirl | #include <sys/queue.h> |
35 | c5e97233 | blueswir1 | #ifndef __DragonFly__
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36 | 7674e7bf | bellard | #include <sys/disk.h> |
37 | 7674e7bf | bellard | #endif
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38 | c5e97233 | blueswir1 | #endif
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39 | 7674e7bf | bellard | |
40 | 49dc768d | aliguori | #ifdef _WIN32
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41 | 49dc768d | aliguori | #include <windows.h> |
42 | 49dc768d | aliguori | #endif
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43 | 49dc768d | aliguori | |
44 | 83f64091 | bellard | #define SECTOR_BITS 9 |
45 | 83f64091 | bellard | #define SECTOR_SIZE (1 << SECTOR_BITS) |
46 | 7cd1e32a | lirans@il.ibm.com | #define SECTORS_PER_DIRTY_CHUNK 8 |
47 | 83f64091 | bellard | |
48 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
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49 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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50 | c87c0672 | aliguori | BlockDriverCompletionFunc *cb, void *opaque);
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51 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
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52 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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53 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque);
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54 | b2e12bc6 | Christoph Hellwig | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
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55 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque);
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56 | 5fafdf24 | ths | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
57 | 83f64091 | bellard | uint8_t *buf, int nb_sectors);
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58 | 83f64091 | bellard | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
59 | 83f64091 | bellard | const uint8_t *buf, int nb_sectors); |
60 | ec530c81 | bellard | |
61 | 7ee930d0 | blueswir1 | BlockDriverState *bdrv_first; |
62 | 7ee930d0 | blueswir1 | |
63 | ea2384d3 | bellard | static BlockDriver *first_drv;
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64 | ea2384d3 | bellard | |
65 | eb852011 | Markus Armbruster | /* If non-zero, use only whitelisted block drivers */
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66 | eb852011 | Markus Armbruster | static int use_bdrv_whitelist; |
67 | eb852011 | Markus Armbruster | |
68 | 83f64091 | bellard | int path_is_absolute(const char *path) |
69 | 3b0d4f61 | bellard | { |
70 | 83f64091 | bellard | const char *p; |
71 | 21664424 | bellard | #ifdef _WIN32
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72 | 21664424 | bellard | /* specific case for names like: "\\.\d:" */
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73 | 21664424 | bellard | if (*path == '/' || *path == '\\') |
74 | 21664424 | bellard | return 1; |
75 | 21664424 | bellard | #endif
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76 | 83f64091 | bellard | p = strchr(path, ':');
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77 | 83f64091 | bellard | if (p)
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78 | 83f64091 | bellard | p++; |
79 | 83f64091 | bellard | else
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80 | 83f64091 | bellard | p = path; |
81 | 3b9f94e1 | bellard | #ifdef _WIN32
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82 | 3b9f94e1 | bellard | return (*p == '/' || *p == '\\'); |
83 | 3b9f94e1 | bellard | #else
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84 | 3b9f94e1 | bellard | return (*p == '/'); |
85 | 3b9f94e1 | bellard | #endif
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86 | 3b0d4f61 | bellard | } |
87 | 3b0d4f61 | bellard | |
88 | 83f64091 | bellard | /* if filename is absolute, just copy it to dest. Otherwise, build a
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89 | 83f64091 | bellard | path to it by considering it is relative to base_path. URL are
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90 | 83f64091 | bellard | supported. */
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91 | 83f64091 | bellard | void path_combine(char *dest, int dest_size, |
92 | 83f64091 | bellard | const char *base_path, |
93 | 83f64091 | bellard | const char *filename) |
94 | 3b0d4f61 | bellard | { |
95 | 83f64091 | bellard | const char *p, *p1; |
96 | 83f64091 | bellard | int len;
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97 | 83f64091 | bellard | |
98 | 83f64091 | bellard | if (dest_size <= 0) |
99 | 83f64091 | bellard | return;
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100 | 83f64091 | bellard | if (path_is_absolute(filename)) {
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101 | 83f64091 | bellard | pstrcpy(dest, dest_size, filename); |
102 | 83f64091 | bellard | } else {
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103 | 83f64091 | bellard | p = strchr(base_path, ':');
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104 | 83f64091 | bellard | if (p)
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105 | 83f64091 | bellard | p++; |
106 | 83f64091 | bellard | else
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107 | 83f64091 | bellard | p = base_path; |
108 | 3b9f94e1 | bellard | p1 = strrchr(base_path, '/');
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109 | 3b9f94e1 | bellard | #ifdef _WIN32
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110 | 3b9f94e1 | bellard | { |
111 | 3b9f94e1 | bellard | const char *p2; |
112 | 3b9f94e1 | bellard | p2 = strrchr(base_path, '\\');
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113 | 3b9f94e1 | bellard | if (!p1 || p2 > p1)
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114 | 3b9f94e1 | bellard | p1 = p2; |
115 | 3b9f94e1 | bellard | } |
116 | 3b9f94e1 | bellard | #endif
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117 | 83f64091 | bellard | if (p1)
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118 | 83f64091 | bellard | p1++; |
119 | 83f64091 | bellard | else
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120 | 83f64091 | bellard | p1 = base_path; |
121 | 83f64091 | bellard | if (p1 > p)
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122 | 83f64091 | bellard | p = p1; |
123 | 83f64091 | bellard | len = p - base_path; |
124 | 83f64091 | bellard | if (len > dest_size - 1) |
125 | 83f64091 | bellard | len = dest_size - 1;
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126 | 83f64091 | bellard | memcpy(dest, base_path, len); |
127 | 83f64091 | bellard | dest[len] = '\0';
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128 | 83f64091 | bellard | pstrcat(dest, dest_size, filename); |
129 | 3b0d4f61 | bellard | } |
130 | 3b0d4f61 | bellard | } |
131 | 3b0d4f61 | bellard | |
132 | 5efa9d5a | Anthony Liguori | void bdrv_register(BlockDriver *bdrv)
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133 | ea2384d3 | bellard | { |
134 | f141eafe | aliguori | if (!bdrv->bdrv_aio_readv) {
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135 | 83f64091 | bellard | /* add AIO emulation layer */
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136 | f141eafe | aliguori | bdrv->bdrv_aio_readv = bdrv_aio_readv_em; |
137 | f141eafe | aliguori | bdrv->bdrv_aio_writev = bdrv_aio_writev_em; |
138 | eda578e5 | aliguori | } else if (!bdrv->bdrv_read) { |
139 | 83f64091 | bellard | /* add synchronous IO emulation layer */
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140 | 83f64091 | bellard | bdrv->bdrv_read = bdrv_read_em; |
141 | 83f64091 | bellard | bdrv->bdrv_write = bdrv_write_em; |
142 | 83f64091 | bellard | } |
143 | b2e12bc6 | Christoph Hellwig | |
144 | b2e12bc6 | Christoph Hellwig | if (!bdrv->bdrv_aio_flush)
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145 | b2e12bc6 | Christoph Hellwig | bdrv->bdrv_aio_flush = bdrv_aio_flush_em; |
146 | b2e12bc6 | Christoph Hellwig | |
147 | ea2384d3 | bellard | bdrv->next = first_drv; |
148 | ea2384d3 | bellard | first_drv = bdrv; |
149 | ea2384d3 | bellard | } |
150 | b338082b | bellard | |
151 | b338082b | bellard | /* create a new block device (by default it is empty) */
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152 | b338082b | bellard | BlockDriverState *bdrv_new(const char *device_name) |
153 | b338082b | bellard | { |
154 | b338082b | bellard | BlockDriverState **pbs, *bs; |
155 | b338082b | bellard | |
156 | b338082b | bellard | bs = qemu_mallocz(sizeof(BlockDriverState));
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157 | b338082b | bellard | pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
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158 | ea2384d3 | bellard | if (device_name[0] != '\0') { |
159 | ea2384d3 | bellard | /* insert at the end */
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160 | ea2384d3 | bellard | pbs = &bdrv_first; |
161 | ea2384d3 | bellard | while (*pbs != NULL) |
162 | ea2384d3 | bellard | pbs = &(*pbs)->next; |
163 | ea2384d3 | bellard | *pbs = bs; |
164 | ea2384d3 | bellard | } |
165 | b338082b | bellard | return bs;
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166 | b338082b | bellard | } |
167 | b338082b | bellard | |
168 | ea2384d3 | bellard | BlockDriver *bdrv_find_format(const char *format_name) |
169 | ea2384d3 | bellard | { |
170 | ea2384d3 | bellard | BlockDriver *drv1; |
171 | ea2384d3 | bellard | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
172 | ea2384d3 | bellard | if (!strcmp(drv1->format_name, format_name))
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173 | ea2384d3 | bellard | return drv1;
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174 | ea2384d3 | bellard | } |
175 | ea2384d3 | bellard | return NULL; |
176 | ea2384d3 | bellard | } |
177 | ea2384d3 | bellard | |
178 | eb852011 | Markus Armbruster | static int bdrv_is_whitelisted(BlockDriver *drv) |
179 | eb852011 | Markus Armbruster | { |
180 | eb852011 | Markus Armbruster | static const char *whitelist[] = { |
181 | eb852011 | Markus Armbruster | CONFIG_BDRV_WHITELIST |
182 | eb852011 | Markus Armbruster | }; |
183 | eb852011 | Markus Armbruster | const char **p; |
184 | eb852011 | Markus Armbruster | |
185 | eb852011 | Markus Armbruster | if (!whitelist[0]) |
186 | eb852011 | Markus Armbruster | return 1; /* no whitelist, anything goes */ |
187 | eb852011 | Markus Armbruster | |
188 | eb852011 | Markus Armbruster | for (p = whitelist; *p; p++) {
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189 | eb852011 | Markus Armbruster | if (!strcmp(drv->format_name, *p)) {
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190 | eb852011 | Markus Armbruster | return 1; |
191 | eb852011 | Markus Armbruster | } |
192 | eb852011 | Markus Armbruster | } |
193 | eb852011 | Markus Armbruster | return 0; |
194 | eb852011 | Markus Armbruster | } |
195 | eb852011 | Markus Armbruster | |
196 | eb852011 | Markus Armbruster | BlockDriver *bdrv_find_whitelisted_format(const char *format_name) |
197 | eb852011 | Markus Armbruster | { |
198 | eb852011 | Markus Armbruster | BlockDriver *drv = bdrv_find_format(format_name); |
199 | eb852011 | Markus Armbruster | return drv && bdrv_is_whitelisted(drv) ? drv : NULL; |
200 | eb852011 | Markus Armbruster | } |
201 | eb852011 | Markus Armbruster | |
202 | 0e7e1989 | Kevin Wolf | int bdrv_create(BlockDriver *drv, const char* filename, |
203 | 0e7e1989 | Kevin Wolf | QEMUOptionParameter *options) |
204 | ea2384d3 | bellard | { |
205 | ea2384d3 | bellard | if (!drv->bdrv_create)
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206 | ea2384d3 | bellard | return -ENOTSUP;
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207 | 0e7e1989 | Kevin Wolf | |
208 | 0e7e1989 | Kevin Wolf | return drv->bdrv_create(filename, options);
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209 | ea2384d3 | bellard | } |
210 | ea2384d3 | bellard | |
211 | d5249393 | bellard | #ifdef _WIN32
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212 | 95389c86 | bellard | void get_tmp_filename(char *filename, int size) |
213 | d5249393 | bellard | { |
214 | 3b9f94e1 | bellard | char temp_dir[MAX_PATH];
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215 | 3b46e624 | ths | |
216 | 3b9f94e1 | bellard | GetTempPath(MAX_PATH, temp_dir); |
217 | 3b9f94e1 | bellard | GetTempFileName(temp_dir, "qem", 0, filename); |
218 | d5249393 | bellard | } |
219 | d5249393 | bellard | #else
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220 | 95389c86 | bellard | void get_tmp_filename(char *filename, int size) |
221 | fc01f7e7 | bellard | { |
222 | 67b915a5 | bellard | int fd;
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223 | 7ccfb2eb | blueswir1 | const char *tmpdir; |
224 | d5249393 | bellard | /* XXX: race condition possible */
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225 | 0badc1ee | aurel32 | tmpdir = getenv("TMPDIR");
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226 | 0badc1ee | aurel32 | if (!tmpdir)
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227 | 0badc1ee | aurel32 | tmpdir = "/tmp";
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228 | 0badc1ee | aurel32 | snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
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229 | ea2384d3 | bellard | fd = mkstemp(filename); |
230 | ea2384d3 | bellard | close(fd); |
231 | ea2384d3 | bellard | } |
232 | d5249393 | bellard | #endif
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233 | fc01f7e7 | bellard | |
234 | 19cb3738 | bellard | #ifdef _WIN32
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235 | f45512fe | bellard | static int is_windows_drive_prefix(const char *filename) |
236 | f45512fe | bellard | { |
237 | f45512fe | bellard | return (((filename[0] >= 'a' && filename[0] <= 'z') || |
238 | f45512fe | bellard | (filename[0] >= 'A' && filename[0] <= 'Z')) && |
239 | f45512fe | bellard | filename[1] == ':'); |
240 | f45512fe | bellard | } |
241 | 3b46e624 | ths | |
242 | 508c7cb3 | Christoph Hellwig | int is_windows_drive(const char *filename) |
243 | 19cb3738 | bellard | { |
244 | 5fafdf24 | ths | if (is_windows_drive_prefix(filename) &&
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245 | f45512fe | bellard | filename[2] == '\0') |
246 | 19cb3738 | bellard | return 1; |
247 | 19cb3738 | bellard | if (strstart(filename, "\\\\.\\", NULL) || |
248 | 19cb3738 | bellard | strstart(filename, "//./", NULL)) |
249 | 19cb3738 | bellard | return 1; |
250 | 19cb3738 | bellard | return 0; |
251 | 19cb3738 | bellard | } |
252 | 19cb3738 | bellard | #endif
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253 | 19cb3738 | bellard | |
254 | 83f64091 | bellard | static BlockDriver *find_protocol(const char *filename) |
255 | 83f64091 | bellard | { |
256 | 83f64091 | bellard | BlockDriver *drv1; |
257 | 83f64091 | bellard | char protocol[128]; |
258 | 1cec71e3 | Anthony Liguori | int len;
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259 | 83f64091 | bellard | const char *p; |
260 | 19cb3738 | bellard | |
261 | 19cb3738 | bellard | #ifdef _WIN32
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262 | f45512fe | bellard | if (is_windows_drive(filename) ||
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263 | f45512fe | bellard | is_windows_drive_prefix(filename)) |
264 | 5efa9d5a | Anthony Liguori | return bdrv_find_format("raw"); |
265 | 19cb3738 | bellard | #endif
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266 | 1cec71e3 | Anthony Liguori | p = strchr(filename, ':');
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267 | 1cec71e3 | Anthony Liguori | if (!p)
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268 | 5efa9d5a | Anthony Liguori | return bdrv_find_format("raw"); |
269 | 1cec71e3 | Anthony Liguori | len = p - filename; |
270 | 1cec71e3 | Anthony Liguori | if (len > sizeof(protocol) - 1) |
271 | 1cec71e3 | Anthony Liguori | len = sizeof(protocol) - 1; |
272 | 1cec71e3 | Anthony Liguori | memcpy(protocol, filename, len); |
273 | 1cec71e3 | Anthony Liguori | protocol[len] = '\0';
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274 | 83f64091 | bellard | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
275 | 5fafdf24 | ths | if (drv1->protocol_name &&
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276 | 83f64091 | bellard | !strcmp(drv1->protocol_name, protocol)) |
277 | 83f64091 | bellard | return drv1;
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278 | 83f64091 | bellard | } |
279 | 83f64091 | bellard | return NULL; |
280 | 83f64091 | bellard | } |
281 | 83f64091 | bellard | |
282 | f3a5d3f8 | Christoph Hellwig | /*
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283 | f3a5d3f8 | Christoph Hellwig | * Detect host devices. By convention, /dev/cdrom[N] is always
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284 | f3a5d3f8 | Christoph Hellwig | * recognized as a host CDROM.
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285 | f3a5d3f8 | Christoph Hellwig | */
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286 | f3a5d3f8 | Christoph Hellwig | static BlockDriver *find_hdev_driver(const char *filename) |
287 | f3a5d3f8 | Christoph Hellwig | { |
288 | 508c7cb3 | Christoph Hellwig | int score_max = 0, score; |
289 | 508c7cb3 | Christoph Hellwig | BlockDriver *drv = NULL, *d;
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290 | f3a5d3f8 | Christoph Hellwig | |
291 | 508c7cb3 | Christoph Hellwig | for (d = first_drv; d; d = d->next) {
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292 | 508c7cb3 | Christoph Hellwig | if (d->bdrv_probe_device) {
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293 | 508c7cb3 | Christoph Hellwig | score = d->bdrv_probe_device(filename); |
294 | 508c7cb3 | Christoph Hellwig | if (score > score_max) {
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295 | 508c7cb3 | Christoph Hellwig | score_max = score; |
296 | 508c7cb3 | Christoph Hellwig | drv = d; |
297 | 508c7cb3 | Christoph Hellwig | } |
298 | 508c7cb3 | Christoph Hellwig | } |
299 | 19cb3738 | bellard | } |
300 | f3a5d3f8 | Christoph Hellwig | |
301 | 508c7cb3 | Christoph Hellwig | return drv;
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302 | f3a5d3f8 | Christoph Hellwig | } |
303 | 3b46e624 | ths | |
304 | f3a5d3f8 | Christoph Hellwig | static BlockDriver *find_image_format(const char *filename) |
305 | f3a5d3f8 | Christoph Hellwig | { |
306 | f3a5d3f8 | Christoph Hellwig | int ret, score, score_max;
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307 | f3a5d3f8 | Christoph Hellwig | BlockDriver *drv1, *drv; |
308 | f3a5d3f8 | Christoph Hellwig | uint8_t buf[2048];
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309 | f3a5d3f8 | Christoph Hellwig | BlockDriverState *bs; |
310 | f3a5d3f8 | Christoph Hellwig | |
311 | 83f64091 | bellard | drv = find_protocol(filename); |
312 | 19cb3738 | bellard | /* no need to test disk image formats for vvfat */
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313 | c833ab73 | Anthony Liguori | if (drv && strcmp(drv->format_name, "vvfat") == 0) |
314 | 83f64091 | bellard | return drv;
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315 | 19cb3738 | bellard | |
316 | 83f64091 | bellard | ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY); |
317 | 83f64091 | bellard | if (ret < 0) |
318 | 83f64091 | bellard | return NULL; |
319 | 83f64091 | bellard | ret = bdrv_pread(bs, 0, buf, sizeof(buf)); |
320 | 83f64091 | bellard | bdrv_delete(bs); |
321 | 83f64091 | bellard | if (ret < 0) { |
322 | 83f64091 | bellard | return NULL; |
323 | 83f64091 | bellard | } |
324 | 83f64091 | bellard | |
325 | ea2384d3 | bellard | score_max = 0;
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326 | ea2384d3 | bellard | for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) { |
327 | 83f64091 | bellard | if (drv1->bdrv_probe) {
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328 | 83f64091 | bellard | score = drv1->bdrv_probe(buf, ret, filename); |
329 | 83f64091 | bellard | if (score > score_max) {
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330 | 83f64091 | bellard | score_max = score; |
331 | 83f64091 | bellard | drv = drv1; |
332 | 83f64091 | bellard | } |
333 | 0849bf08 | bellard | } |
334 | fc01f7e7 | bellard | } |
335 | ea2384d3 | bellard | return drv;
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336 | ea2384d3 | bellard | } |
337 | ea2384d3 | bellard | |
338 | 83f64091 | bellard | int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags) |
339 | ea2384d3 | bellard | { |
340 | 83f64091 | bellard | BlockDriverState *bs; |
341 | 83f64091 | bellard | int ret;
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342 | 83f64091 | bellard | |
343 | 83f64091 | bellard | bs = bdrv_new("");
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344 | 83f64091 | bellard | ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
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345 | 83f64091 | bellard | if (ret < 0) { |
346 | 83f64091 | bellard | bdrv_delete(bs); |
347 | 83f64091 | bellard | return ret;
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348 | 3b0d4f61 | bellard | } |
349 | 71d0770c | aliguori | bs->growable = 1;
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350 | 83f64091 | bellard | *pbs = bs; |
351 | 83f64091 | bellard | return 0; |
352 | 83f64091 | bellard | } |
353 | 83f64091 | bellard | |
354 | 83f64091 | bellard | int bdrv_open(BlockDriverState *bs, const char *filename, int flags) |
355 | 83f64091 | bellard | { |
356 | 83f64091 | bellard | return bdrv_open2(bs, filename, flags, NULL); |
357 | ea2384d3 | bellard | } |
358 | ea2384d3 | bellard | |
359 | 83f64091 | bellard | int bdrv_open2(BlockDriverState *bs, const char *filename, int flags, |
360 | ea2384d3 | bellard | BlockDriver *drv) |
361 | ea2384d3 | bellard | { |
362 | 59f2689d | Naphtali Sprei | int ret, open_flags, try_rw;
|
363 | eb5c851f | ths | char tmp_filename[PATH_MAX];
|
364 | eb5c851f | ths | char backing_filename[PATH_MAX];
|
365 | 3b46e624 | ths | |
366 | ea2384d3 | bellard | bs->is_temporary = 0;
|
367 | ea2384d3 | bellard | bs->encrypted = 0;
|
368 | c0f4ce77 | aliguori | bs->valid_key = 0;
|
369 | e268ca52 | aliguori | /* buffer_alignment defaulted to 512, drivers can change this value */
|
370 | e268ca52 | aliguori | bs->buffer_alignment = 512;
|
371 | 712e7874 | bellard | |
372 | 83f64091 | bellard | if (flags & BDRV_O_SNAPSHOT) {
|
373 | ea2384d3 | bellard | BlockDriverState *bs1; |
374 | ea2384d3 | bellard | int64_t total_size; |
375 | 7c96d46e | aliguori | int is_protocol = 0; |
376 | 91a073a9 | Kevin Wolf | BlockDriver *bdrv_qcow2; |
377 | 91a073a9 | Kevin Wolf | QEMUOptionParameter *options; |
378 | 3b46e624 | ths | |
379 | ea2384d3 | bellard | /* if snapshot, we create a temporary backing file and open it
|
380 | ea2384d3 | bellard | instead of opening 'filename' directly */
|
381 | 33e3963e | bellard | |
382 | ea2384d3 | bellard | /* if there is a backing file, use it */
|
383 | ea2384d3 | bellard | bs1 = bdrv_new("");
|
384 | 5eb45639 | aliguori | ret = bdrv_open2(bs1, filename, 0, drv);
|
385 | 51d7c00c | aliguori | if (ret < 0) { |
386 | ea2384d3 | bellard | bdrv_delete(bs1); |
387 | 51d7c00c | aliguori | return ret;
|
388 | ea2384d3 | bellard | } |
389 | 83f64091 | bellard | total_size = bdrv_getlength(bs1) >> SECTOR_BITS; |
390 | 7c96d46e | aliguori | |
391 | 7c96d46e | aliguori | if (bs1->drv && bs1->drv->protocol_name)
|
392 | 7c96d46e | aliguori | is_protocol = 1;
|
393 | 7c96d46e | aliguori | |
394 | ea2384d3 | bellard | bdrv_delete(bs1); |
395 | 3b46e624 | ths | |
396 | ea2384d3 | bellard | get_tmp_filename(tmp_filename, sizeof(tmp_filename));
|
397 | 7c96d46e | aliguori | |
398 | 7c96d46e | aliguori | /* Real path is meaningless for protocols */
|
399 | 7c96d46e | aliguori | if (is_protocol)
|
400 | 7c96d46e | aliguori | snprintf(backing_filename, sizeof(backing_filename),
|
401 | 7c96d46e | aliguori | "%s", filename);
|
402 | 7c96d46e | aliguori | else
|
403 | 7c96d46e | aliguori | realpath(filename, backing_filename); |
404 | 7c96d46e | aliguori | |
405 | 91a073a9 | Kevin Wolf | bdrv_qcow2 = bdrv_find_format("qcow2");
|
406 | 91a073a9 | Kevin Wolf | options = parse_option_parameters("", bdrv_qcow2->create_options, NULL); |
407 | 91a073a9 | Kevin Wolf | |
408 | 91a073a9 | Kevin Wolf | set_option_parameter_int(options, BLOCK_OPT_SIZE, total_size * 512);
|
409 | 91a073a9 | Kevin Wolf | set_option_parameter(options, BLOCK_OPT_BACKING_FILE, backing_filename); |
410 | 91a073a9 | Kevin Wolf | if (drv) {
|
411 | 91a073a9 | Kevin Wolf | set_option_parameter(options, BLOCK_OPT_BACKING_FMT, |
412 | 91a073a9 | Kevin Wolf | drv->format_name); |
413 | 91a073a9 | Kevin Wolf | } |
414 | 91a073a9 | Kevin Wolf | |
415 | 91a073a9 | Kevin Wolf | ret = bdrv_create(bdrv_qcow2, tmp_filename, options); |
416 | 51d7c00c | aliguori | if (ret < 0) { |
417 | 51d7c00c | aliguori | return ret;
|
418 | ea2384d3 | bellard | } |
419 | 91a073a9 | Kevin Wolf | |
420 | ea2384d3 | bellard | filename = tmp_filename; |
421 | 91a073a9 | Kevin Wolf | drv = bdrv_qcow2; |
422 | ea2384d3 | bellard | bs->is_temporary = 1;
|
423 | ea2384d3 | bellard | } |
424 | 712e7874 | bellard | |
425 | ea2384d3 | bellard | pstrcpy(bs->filename, sizeof(bs->filename), filename);
|
426 | 83f64091 | bellard | if (flags & BDRV_O_FILE) {
|
427 | 83f64091 | bellard | drv = find_protocol(filename); |
428 | 51d7c00c | aliguori | } else if (!drv) { |
429 | f3a5d3f8 | Christoph Hellwig | drv = find_hdev_driver(filename); |
430 | f3a5d3f8 | Christoph Hellwig | if (!drv) {
|
431 | f3a5d3f8 | Christoph Hellwig | drv = find_image_format(filename); |
432 | f3a5d3f8 | Christoph Hellwig | } |
433 | 51d7c00c | aliguori | } |
434 | 51d7c00c | aliguori | if (!drv) {
|
435 | 51d7c00c | aliguori | ret = -ENOENT; |
436 | 51d7c00c | aliguori | goto unlink_and_fail;
|
437 | ea2384d3 | bellard | } |
438 | ea2384d3 | bellard | bs->drv = drv; |
439 | ea2384d3 | bellard | bs->opaque = qemu_mallocz(drv->instance_size); |
440 | e900a7b7 | Christoph Hellwig | |
441 | e900a7b7 | Christoph Hellwig | /*
|
442 | e900a7b7 | Christoph Hellwig | * Yes, BDRV_O_NOCACHE aka O_DIRECT means we have to present a
|
443 | e900a7b7 | Christoph Hellwig | * write cache to the guest. We do need the fdatasync to flush
|
444 | e900a7b7 | Christoph Hellwig | * out transactions for block allocations, and we maybe have a
|
445 | e900a7b7 | Christoph Hellwig | * volatile write cache in our backing device to deal with.
|
446 | e900a7b7 | Christoph Hellwig | */
|
447 | e900a7b7 | Christoph Hellwig | if (flags & (BDRV_O_CACHE_WB|BDRV_O_NOCACHE))
|
448 | e900a7b7 | Christoph Hellwig | bs->enable_write_cache = 1;
|
449 | e900a7b7 | Christoph Hellwig | |
450 | 83f64091 | bellard | /* Note: for compatibility, we open disk image files as RDWR, and
|
451 | 83f64091 | bellard | RDONLY as fallback */
|
452 | 59f2689d | Naphtali Sprei | try_rw = !bs->read_only || bs->is_temporary; |
453 | 83f64091 | bellard | if (!(flags & BDRV_O_FILE))
|
454 | 59f2689d | Naphtali Sprei | open_flags = (try_rw ? BDRV_O_RDWR : 0) |
|
455 | 59f2689d | Naphtali Sprei | (flags & (BDRV_O_CACHE_MASK|BDRV_O_NATIVE_AIO)); |
456 | 83f64091 | bellard | else
|
457 | 83f64091 | bellard | open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT); |
458 | eb852011 | Markus Armbruster | if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv))
|
459 | eb852011 | Markus Armbruster | ret = -ENOTSUP; |
460 | eb852011 | Markus Armbruster | else
|
461 | eb852011 | Markus Armbruster | ret = drv->bdrv_open(bs, filename, open_flags); |
462 | a0a83536 | aurel32 | if ((ret == -EACCES || ret == -EPERM) && !(flags & BDRV_O_FILE)) {
|
463 | 1cec71e3 | Anthony Liguori | ret = drv->bdrv_open(bs, filename, open_flags & ~BDRV_O_RDWR); |
464 | 83f64091 | bellard | bs->read_only = 1;
|
465 | 83f64091 | bellard | } |
466 | ea2384d3 | bellard | if (ret < 0) { |
467 | ea2384d3 | bellard | qemu_free(bs->opaque); |
468 | 6b21b973 | bellard | bs->opaque = NULL;
|
469 | 6b21b973 | bellard | bs->drv = NULL;
|
470 | 51d7c00c | aliguori | unlink_and_fail:
|
471 | 51d7c00c | aliguori | if (bs->is_temporary)
|
472 | 51d7c00c | aliguori | unlink(filename); |
473 | 83f64091 | bellard | return ret;
|
474 | 33e3963e | bellard | } |
475 | d15a771d | bellard | if (drv->bdrv_getlength) {
|
476 | d15a771d | bellard | bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
477 | d15a771d | bellard | } |
478 | 67b915a5 | bellard | #ifndef _WIN32
|
479 | ea2384d3 | bellard | if (bs->is_temporary) {
|
480 | ea2384d3 | bellard | unlink(filename); |
481 | ea2384d3 | bellard | } |
482 | ea2384d3 | bellard | #endif
|
483 | 83f64091 | bellard | if (bs->backing_file[0] != '\0') { |
484 | ea2384d3 | bellard | /* if there is a backing file, use it */
|
485 | 5eb45639 | aliguori | BlockDriver *back_drv = NULL;
|
486 | ea2384d3 | bellard | bs->backing_hd = bdrv_new("");
|
487 | 59f2689d | Naphtali Sprei | /* pass on read_only property to the backing_hd */
|
488 | 59f2689d | Naphtali Sprei | bs->backing_hd->read_only = bs->read_only; |
489 | 83f64091 | bellard | path_combine(backing_filename, sizeof(backing_filename),
|
490 | 83f64091 | bellard | filename, bs->backing_file); |
491 | 5eb45639 | aliguori | if (bs->backing_format[0] != '\0') |
492 | 5eb45639 | aliguori | back_drv = bdrv_find_format(bs->backing_format); |
493 | 5eb45639 | aliguori | ret = bdrv_open2(bs->backing_hd, backing_filename, open_flags, |
494 | 5eb45639 | aliguori | back_drv); |
495 | 51d7c00c | aliguori | if (ret < 0) { |
496 | 51d7c00c | aliguori | bdrv_close(bs); |
497 | 51d7c00c | aliguori | return ret;
|
498 | 51d7c00c | aliguori | } |
499 | 33e3963e | bellard | } |
500 | 33e3963e | bellard | |
501 | bb5fc20f | aliguori | if (!bdrv_key_required(bs)) {
|
502 | bb5fc20f | aliguori | /* call the change callback */
|
503 | bb5fc20f | aliguori | bs->media_changed = 1;
|
504 | bb5fc20f | aliguori | if (bs->change_cb)
|
505 | bb5fc20f | aliguori | bs->change_cb(bs->change_opaque); |
506 | bb5fc20f | aliguori | } |
507 | b338082b | bellard | return 0; |
508 | fc01f7e7 | bellard | } |
509 | fc01f7e7 | bellard | |
510 | fc01f7e7 | bellard | void bdrv_close(BlockDriverState *bs)
|
511 | fc01f7e7 | bellard | { |
512 | 19cb3738 | bellard | if (bs->drv) {
|
513 | ea2384d3 | bellard | if (bs->backing_hd)
|
514 | ea2384d3 | bellard | bdrv_delete(bs->backing_hd); |
515 | ea2384d3 | bellard | bs->drv->bdrv_close(bs); |
516 | ea2384d3 | bellard | qemu_free(bs->opaque); |
517 | ea2384d3 | bellard | #ifdef _WIN32
|
518 | ea2384d3 | bellard | if (bs->is_temporary) {
|
519 | ea2384d3 | bellard | unlink(bs->filename); |
520 | ea2384d3 | bellard | } |
521 | 67b915a5 | bellard | #endif
|
522 | ea2384d3 | bellard | bs->opaque = NULL;
|
523 | ea2384d3 | bellard | bs->drv = NULL;
|
524 | b338082b | bellard | |
525 | b338082b | bellard | /* call the change callback */
|
526 | 19cb3738 | bellard | bs->media_changed = 1;
|
527 | b338082b | bellard | if (bs->change_cb)
|
528 | b338082b | bellard | bs->change_cb(bs->change_opaque); |
529 | b338082b | bellard | } |
530 | b338082b | bellard | } |
531 | b338082b | bellard | |
532 | b338082b | bellard | void bdrv_delete(BlockDriverState *bs)
|
533 | b338082b | bellard | { |
534 | 34c6f050 | aurel32 | BlockDriverState **pbs; |
535 | 34c6f050 | aurel32 | |
536 | 34c6f050 | aurel32 | pbs = &bdrv_first; |
537 | 34c6f050 | aurel32 | while (*pbs != bs && *pbs != NULL) |
538 | 34c6f050 | aurel32 | pbs = &(*pbs)->next; |
539 | 34c6f050 | aurel32 | if (*pbs == bs)
|
540 | 34c6f050 | aurel32 | *pbs = bs->next; |
541 | 34c6f050 | aurel32 | |
542 | b338082b | bellard | bdrv_close(bs); |
543 | b338082b | bellard | qemu_free(bs); |
544 | fc01f7e7 | bellard | } |
545 | fc01f7e7 | bellard | |
546 | e97fc193 | aliguori | /*
|
547 | e97fc193 | aliguori | * Run consistency checks on an image
|
548 | e97fc193 | aliguori | *
|
549 | e97fc193 | aliguori | * Returns the number of errors or -errno when an internal error occurs
|
550 | e97fc193 | aliguori | */
|
551 | e97fc193 | aliguori | int bdrv_check(BlockDriverState *bs)
|
552 | e97fc193 | aliguori | { |
553 | e97fc193 | aliguori | if (bs->drv->bdrv_check == NULL) { |
554 | e97fc193 | aliguori | return -ENOTSUP;
|
555 | e97fc193 | aliguori | } |
556 | e97fc193 | aliguori | |
557 | e97fc193 | aliguori | return bs->drv->bdrv_check(bs);
|
558 | e97fc193 | aliguori | } |
559 | e97fc193 | aliguori | |
560 | 33e3963e | bellard | /* commit COW file into the raw image */
|
561 | 33e3963e | bellard | int bdrv_commit(BlockDriverState *bs)
|
562 | 33e3963e | bellard | { |
563 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
564 | 83f64091 | bellard | int64_t i, total_sectors; |
565 | ea2384d3 | bellard | int n, j;
|
566 | ea2384d3 | bellard | unsigned char sector[512]; |
567 | 33e3963e | bellard | |
568 | 19cb3738 | bellard | if (!drv)
|
569 | 19cb3738 | bellard | return -ENOMEDIUM;
|
570 | 33e3963e | bellard | |
571 | 33e3963e | bellard | if (bs->read_only) {
|
572 | ea2384d3 | bellard | return -EACCES;
|
573 | 33e3963e | bellard | } |
574 | 33e3963e | bellard | |
575 | ea2384d3 | bellard | if (!bs->backing_hd) {
|
576 | ea2384d3 | bellard | return -ENOTSUP;
|
577 | ea2384d3 | bellard | } |
578 | 33e3963e | bellard | |
579 | 83f64091 | bellard | total_sectors = bdrv_getlength(bs) >> SECTOR_BITS; |
580 | 83f64091 | bellard | for (i = 0; i < total_sectors;) { |
581 | 19cb3738 | bellard | if (drv->bdrv_is_allocated(bs, i, 65536, &n)) { |
582 | ea2384d3 | bellard | for(j = 0; j < n; j++) { |
583 | ea2384d3 | bellard | if (bdrv_read(bs, i, sector, 1) != 0) { |
584 | ea2384d3 | bellard | return -EIO;
|
585 | ea2384d3 | bellard | } |
586 | ea2384d3 | bellard | |
587 | ea2384d3 | bellard | if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) { |
588 | ea2384d3 | bellard | return -EIO;
|
589 | ea2384d3 | bellard | } |
590 | ea2384d3 | bellard | i++; |
591 | 33e3963e | bellard | } |
592 | ea2384d3 | bellard | } else {
|
593 | ea2384d3 | bellard | i += n; |
594 | ea2384d3 | bellard | } |
595 | 33e3963e | bellard | } |
596 | 95389c86 | bellard | |
597 | 19cb3738 | bellard | if (drv->bdrv_make_empty)
|
598 | 19cb3738 | bellard | return drv->bdrv_make_empty(bs);
|
599 | 95389c86 | bellard | |
600 | 33e3963e | bellard | return 0; |
601 | 33e3963e | bellard | } |
602 | 33e3963e | bellard | |
603 | 71d0770c | aliguori | static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, |
604 | 71d0770c | aliguori | size_t size) |
605 | 71d0770c | aliguori | { |
606 | 71d0770c | aliguori | int64_t len; |
607 | 71d0770c | aliguori | |
608 | 71d0770c | aliguori | if (!bdrv_is_inserted(bs))
|
609 | 71d0770c | aliguori | return -ENOMEDIUM;
|
610 | 71d0770c | aliguori | |
611 | 71d0770c | aliguori | if (bs->growable)
|
612 | 71d0770c | aliguori | return 0; |
613 | 71d0770c | aliguori | |
614 | 71d0770c | aliguori | len = bdrv_getlength(bs); |
615 | 71d0770c | aliguori | |
616 | fbb7b4e0 | Kevin Wolf | if (offset < 0) |
617 | fbb7b4e0 | Kevin Wolf | return -EIO;
|
618 | fbb7b4e0 | Kevin Wolf | |
619 | fbb7b4e0 | Kevin Wolf | if ((offset > len) || (len - offset < size))
|
620 | 71d0770c | aliguori | return -EIO;
|
621 | 71d0770c | aliguori | |
622 | 71d0770c | aliguori | return 0; |
623 | 71d0770c | aliguori | } |
624 | 71d0770c | aliguori | |
625 | 71d0770c | aliguori | static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num, |
626 | 71d0770c | aliguori | int nb_sectors)
|
627 | 71d0770c | aliguori | { |
628 | 999dec57 | aliguori | return bdrv_check_byte_request(bs, sector_num * 512, nb_sectors * 512); |
629 | 71d0770c | aliguori | } |
630 | 71d0770c | aliguori | |
631 | 19cb3738 | bellard | /* return < 0 if error. See bdrv_write() for the return codes */
|
632 | 5fafdf24 | ths | int bdrv_read(BlockDriverState *bs, int64_t sector_num,
|
633 | fc01f7e7 | bellard | uint8_t *buf, int nb_sectors)
|
634 | fc01f7e7 | bellard | { |
635 | ea2384d3 | bellard | BlockDriver *drv = bs->drv; |
636 | ea2384d3 | bellard | |
637 | 19cb3738 | bellard | if (!drv)
|
638 | 19cb3738 | bellard | return -ENOMEDIUM;
|
639 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
640 | 71d0770c | aliguori | return -EIO;
|
641 | b338082b | bellard | |
642 | eda578e5 | aliguori | return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
|
643 | fc01f7e7 | bellard | } |
644 | fc01f7e7 | bellard | |
645 | 7cd1e32a | lirans@il.ibm.com | static void set_dirty_bitmap(BlockDriverState *bs, int64_t sector_num, |
646 | 7cd1e32a | lirans@il.ibm.com | int nb_sectors, int dirty) |
647 | 7cd1e32a | lirans@il.ibm.com | { |
648 | 7cd1e32a | lirans@il.ibm.com | int64_t start, end; |
649 | 7cd1e32a | lirans@il.ibm.com | start = sector_num / SECTORS_PER_DIRTY_CHUNK; |
650 | 7cd1e32a | lirans@il.ibm.com | end = (sector_num + nb_sectors) / SECTORS_PER_DIRTY_CHUNK; |
651 | 7cd1e32a | lirans@il.ibm.com | |
652 | 7cd1e32a | lirans@il.ibm.com | for(; start <= end; start++) {
|
653 | 7cd1e32a | lirans@il.ibm.com | bs->dirty_bitmap[start] = dirty; |
654 | 7cd1e32a | lirans@il.ibm.com | } |
655 | 7cd1e32a | lirans@il.ibm.com | } |
656 | 7cd1e32a | lirans@il.ibm.com | |
657 | 5fafdf24 | ths | /* Return < 0 if error. Important errors are:
|
658 | 19cb3738 | bellard | -EIO generic I/O error (may happen for all errors)
|
659 | 19cb3738 | bellard | -ENOMEDIUM No media inserted.
|
660 | 19cb3738 | bellard | -EINVAL Invalid sector number or nb_sectors
|
661 | 19cb3738 | bellard | -EACCES Trying to write a read-only device
|
662 | 19cb3738 | bellard | */
|
663 | 5fafdf24 | ths | int bdrv_write(BlockDriverState *bs, int64_t sector_num,
|
664 | fc01f7e7 | bellard | const uint8_t *buf, int nb_sectors) |
665 | fc01f7e7 | bellard | { |
666 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
667 | 19cb3738 | bellard | if (!bs->drv)
|
668 | 19cb3738 | bellard | return -ENOMEDIUM;
|
669 | 0849bf08 | bellard | if (bs->read_only)
|
670 | 19cb3738 | bellard | return -EACCES;
|
671 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
672 | 71d0770c | aliguori | return -EIO;
|
673 | 7cd1e32a | lirans@il.ibm.com | |
674 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_tracking) {
|
675 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
676 | 7cd1e32a | lirans@il.ibm.com | } |
677 | 7cd1e32a | lirans@il.ibm.com | |
678 | 42fb2807 | aliguori | return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
|
679 | 83f64091 | bellard | } |
680 | 83f64091 | bellard | |
681 | eda578e5 | aliguori | int bdrv_pread(BlockDriverState *bs, int64_t offset,
|
682 | eda578e5 | aliguori | void *buf, int count1) |
683 | 83f64091 | bellard | { |
684 | 83f64091 | bellard | uint8_t tmp_buf[SECTOR_SIZE]; |
685 | 83f64091 | bellard | int len, nb_sectors, count;
|
686 | 83f64091 | bellard | int64_t sector_num; |
687 | 83f64091 | bellard | |
688 | 83f64091 | bellard | count = count1; |
689 | 83f64091 | bellard | /* first read to align to sector start */
|
690 | 83f64091 | bellard | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
691 | 83f64091 | bellard | if (len > count)
|
692 | 83f64091 | bellard | len = count; |
693 | 83f64091 | bellard | sector_num = offset >> SECTOR_BITS; |
694 | 83f64091 | bellard | if (len > 0) { |
695 | 83f64091 | bellard | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
696 | 83f64091 | bellard | return -EIO;
|
697 | 83f64091 | bellard | memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
|
698 | 83f64091 | bellard | count -= len; |
699 | 83f64091 | bellard | if (count == 0) |
700 | 83f64091 | bellard | return count1;
|
701 | 83f64091 | bellard | sector_num++; |
702 | 83f64091 | bellard | buf += len; |
703 | 83f64091 | bellard | } |
704 | 83f64091 | bellard | |
705 | 83f64091 | bellard | /* read the sectors "in place" */
|
706 | 83f64091 | bellard | nb_sectors = count >> SECTOR_BITS; |
707 | 83f64091 | bellard | if (nb_sectors > 0) { |
708 | 83f64091 | bellard | if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0) |
709 | 83f64091 | bellard | return -EIO;
|
710 | 83f64091 | bellard | sector_num += nb_sectors; |
711 | 83f64091 | bellard | len = nb_sectors << SECTOR_BITS; |
712 | 83f64091 | bellard | buf += len; |
713 | 83f64091 | bellard | count -= len; |
714 | 83f64091 | bellard | } |
715 | 83f64091 | bellard | |
716 | 83f64091 | bellard | /* add data from the last sector */
|
717 | 83f64091 | bellard | if (count > 0) { |
718 | 83f64091 | bellard | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
719 | 83f64091 | bellard | return -EIO;
|
720 | 83f64091 | bellard | memcpy(buf, tmp_buf, count); |
721 | 83f64091 | bellard | } |
722 | 83f64091 | bellard | return count1;
|
723 | 83f64091 | bellard | } |
724 | 83f64091 | bellard | |
725 | eda578e5 | aliguori | int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
|
726 | eda578e5 | aliguori | const void *buf, int count1) |
727 | 83f64091 | bellard | { |
728 | 83f64091 | bellard | uint8_t tmp_buf[SECTOR_SIZE]; |
729 | 83f64091 | bellard | int len, nb_sectors, count;
|
730 | 83f64091 | bellard | int64_t sector_num; |
731 | 83f64091 | bellard | |
732 | 83f64091 | bellard | count = count1; |
733 | 83f64091 | bellard | /* first write to align to sector start */
|
734 | 83f64091 | bellard | len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
|
735 | 83f64091 | bellard | if (len > count)
|
736 | 83f64091 | bellard | len = count; |
737 | 83f64091 | bellard | sector_num = offset >> SECTOR_BITS; |
738 | 83f64091 | bellard | if (len > 0) { |
739 | 83f64091 | bellard | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
740 | 83f64091 | bellard | return -EIO;
|
741 | 83f64091 | bellard | memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
|
742 | 83f64091 | bellard | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
743 | 83f64091 | bellard | return -EIO;
|
744 | 83f64091 | bellard | count -= len; |
745 | 83f64091 | bellard | if (count == 0) |
746 | 83f64091 | bellard | return count1;
|
747 | 83f64091 | bellard | sector_num++; |
748 | 83f64091 | bellard | buf += len; |
749 | 83f64091 | bellard | } |
750 | 83f64091 | bellard | |
751 | 83f64091 | bellard | /* write the sectors "in place" */
|
752 | 83f64091 | bellard | nb_sectors = count >> SECTOR_BITS; |
753 | 83f64091 | bellard | if (nb_sectors > 0) { |
754 | 83f64091 | bellard | if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0) |
755 | 83f64091 | bellard | return -EIO;
|
756 | 83f64091 | bellard | sector_num += nb_sectors; |
757 | 83f64091 | bellard | len = nb_sectors << SECTOR_BITS; |
758 | 83f64091 | bellard | buf += len; |
759 | 83f64091 | bellard | count -= len; |
760 | 83f64091 | bellard | } |
761 | 83f64091 | bellard | |
762 | 83f64091 | bellard | /* add data from the last sector */
|
763 | 83f64091 | bellard | if (count > 0) { |
764 | 83f64091 | bellard | if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0) |
765 | 83f64091 | bellard | return -EIO;
|
766 | 83f64091 | bellard | memcpy(tmp_buf, buf, count); |
767 | 83f64091 | bellard | if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0) |
768 | 83f64091 | bellard | return -EIO;
|
769 | 83f64091 | bellard | } |
770 | 83f64091 | bellard | return count1;
|
771 | 83f64091 | bellard | } |
772 | 83f64091 | bellard | |
773 | 83f64091 | bellard | /**
|
774 | 83f64091 | bellard | * Truncate file to 'offset' bytes (needed only for file protocols)
|
775 | 83f64091 | bellard | */
|
776 | 83f64091 | bellard | int bdrv_truncate(BlockDriverState *bs, int64_t offset)
|
777 | 83f64091 | bellard | { |
778 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
779 | 83f64091 | bellard | if (!drv)
|
780 | 19cb3738 | bellard | return -ENOMEDIUM;
|
781 | 83f64091 | bellard | if (!drv->bdrv_truncate)
|
782 | 83f64091 | bellard | return -ENOTSUP;
|
783 | 59f2689d | Naphtali Sprei | if (bs->read_only)
|
784 | 59f2689d | Naphtali Sprei | return -EACCES;
|
785 | 83f64091 | bellard | return drv->bdrv_truncate(bs, offset);
|
786 | 83f64091 | bellard | } |
787 | 83f64091 | bellard | |
788 | 83f64091 | bellard | /**
|
789 | 83f64091 | bellard | * Length of a file in bytes. Return < 0 if error or unknown.
|
790 | 83f64091 | bellard | */
|
791 | 83f64091 | bellard | int64_t bdrv_getlength(BlockDriverState *bs) |
792 | 83f64091 | bellard | { |
793 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
794 | 83f64091 | bellard | if (!drv)
|
795 | 19cb3738 | bellard | return -ENOMEDIUM;
|
796 | 83f64091 | bellard | if (!drv->bdrv_getlength) {
|
797 | 83f64091 | bellard | /* legacy mode */
|
798 | 83f64091 | bellard | return bs->total_sectors * SECTOR_SIZE;
|
799 | 83f64091 | bellard | } |
800 | 83f64091 | bellard | return drv->bdrv_getlength(bs);
|
801 | fc01f7e7 | bellard | } |
802 | fc01f7e7 | bellard | |
803 | 19cb3738 | bellard | /* return 0 as number of sectors if no device present or error */
|
804 | 96b8f136 | ths | void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
|
805 | fc01f7e7 | bellard | { |
806 | 19cb3738 | bellard | int64_t length; |
807 | 19cb3738 | bellard | length = bdrv_getlength(bs); |
808 | 19cb3738 | bellard | if (length < 0) |
809 | 19cb3738 | bellard | length = 0;
|
810 | 19cb3738 | bellard | else
|
811 | 19cb3738 | bellard | length = length >> SECTOR_BITS; |
812 | 19cb3738 | bellard | *nb_sectors_ptr = length; |
813 | fc01f7e7 | bellard | } |
814 | cf98951b | bellard | |
815 | f3d54fc4 | aliguori | struct partition {
|
816 | f3d54fc4 | aliguori | uint8_t boot_ind; /* 0x80 - active */
|
817 | f3d54fc4 | aliguori | uint8_t head; /* starting head */
|
818 | f3d54fc4 | aliguori | uint8_t sector; /* starting sector */
|
819 | f3d54fc4 | aliguori | uint8_t cyl; /* starting cylinder */
|
820 | f3d54fc4 | aliguori | uint8_t sys_ind; /* What partition type */
|
821 | f3d54fc4 | aliguori | uint8_t end_head; /* end head */
|
822 | f3d54fc4 | aliguori | uint8_t end_sector; /* end sector */
|
823 | f3d54fc4 | aliguori | uint8_t end_cyl; /* end cylinder */
|
824 | f3d54fc4 | aliguori | uint32_t start_sect; /* starting sector counting from 0 */
|
825 | f3d54fc4 | aliguori | uint32_t nr_sects; /* nr of sectors in partition */
|
826 | f3d54fc4 | aliguori | } __attribute__((packed)); |
827 | f3d54fc4 | aliguori | |
828 | f3d54fc4 | aliguori | /* try to guess the disk logical geometry from the MSDOS partition table. Return 0 if OK, -1 if could not guess */
|
829 | f3d54fc4 | aliguori | static int guess_disk_lchs(BlockDriverState *bs, |
830 | f3d54fc4 | aliguori | int *pcylinders, int *pheads, int *psectors) |
831 | f3d54fc4 | aliguori | { |
832 | f3d54fc4 | aliguori | uint8_t buf[512];
|
833 | f3d54fc4 | aliguori | int ret, i, heads, sectors, cylinders;
|
834 | f3d54fc4 | aliguori | struct partition *p;
|
835 | f3d54fc4 | aliguori | uint32_t nr_sects; |
836 | a38131b6 | blueswir1 | uint64_t nb_sectors; |
837 | f3d54fc4 | aliguori | |
838 | f3d54fc4 | aliguori | bdrv_get_geometry(bs, &nb_sectors); |
839 | f3d54fc4 | aliguori | |
840 | f3d54fc4 | aliguori | ret = bdrv_read(bs, 0, buf, 1); |
841 | f3d54fc4 | aliguori | if (ret < 0) |
842 | f3d54fc4 | aliguori | return -1; |
843 | f3d54fc4 | aliguori | /* test msdos magic */
|
844 | f3d54fc4 | aliguori | if (buf[510] != 0x55 || buf[511] != 0xaa) |
845 | f3d54fc4 | aliguori | return -1; |
846 | f3d54fc4 | aliguori | for(i = 0; i < 4; i++) { |
847 | f3d54fc4 | aliguori | p = ((struct partition *)(buf + 0x1be)) + i; |
848 | f3d54fc4 | aliguori | nr_sects = le32_to_cpu(p->nr_sects); |
849 | f3d54fc4 | aliguori | if (nr_sects && p->end_head) {
|
850 | f3d54fc4 | aliguori | /* We make the assumption that the partition terminates on
|
851 | f3d54fc4 | aliguori | a cylinder boundary */
|
852 | f3d54fc4 | aliguori | heads = p->end_head + 1;
|
853 | f3d54fc4 | aliguori | sectors = p->end_sector & 63;
|
854 | f3d54fc4 | aliguori | if (sectors == 0) |
855 | f3d54fc4 | aliguori | continue;
|
856 | f3d54fc4 | aliguori | cylinders = nb_sectors / (heads * sectors); |
857 | f3d54fc4 | aliguori | if (cylinders < 1 || cylinders > 16383) |
858 | f3d54fc4 | aliguori | continue;
|
859 | f3d54fc4 | aliguori | *pheads = heads; |
860 | f3d54fc4 | aliguori | *psectors = sectors; |
861 | f3d54fc4 | aliguori | *pcylinders = cylinders; |
862 | f3d54fc4 | aliguori | #if 0
|
863 | f3d54fc4 | aliguori | printf("guessed geometry: LCHS=%d %d %d\n",
|
864 | f3d54fc4 | aliguori | cylinders, heads, sectors);
|
865 | f3d54fc4 | aliguori | #endif
|
866 | f3d54fc4 | aliguori | return 0; |
867 | f3d54fc4 | aliguori | } |
868 | f3d54fc4 | aliguori | } |
869 | f3d54fc4 | aliguori | return -1; |
870 | f3d54fc4 | aliguori | } |
871 | f3d54fc4 | aliguori | |
872 | f3d54fc4 | aliguori | void bdrv_guess_geometry(BlockDriverState *bs, int *pcyls, int *pheads, int *psecs) |
873 | f3d54fc4 | aliguori | { |
874 | f3d54fc4 | aliguori | int translation, lba_detected = 0; |
875 | f3d54fc4 | aliguori | int cylinders, heads, secs;
|
876 | a38131b6 | blueswir1 | uint64_t nb_sectors; |
877 | f3d54fc4 | aliguori | |
878 | f3d54fc4 | aliguori | /* if a geometry hint is available, use it */
|
879 | f3d54fc4 | aliguori | bdrv_get_geometry(bs, &nb_sectors); |
880 | f3d54fc4 | aliguori | bdrv_get_geometry_hint(bs, &cylinders, &heads, &secs); |
881 | f3d54fc4 | aliguori | translation = bdrv_get_translation_hint(bs); |
882 | f3d54fc4 | aliguori | if (cylinders != 0) { |
883 | f3d54fc4 | aliguori | *pcyls = cylinders; |
884 | f3d54fc4 | aliguori | *pheads = heads; |
885 | f3d54fc4 | aliguori | *psecs = secs; |
886 | f3d54fc4 | aliguori | } else {
|
887 | f3d54fc4 | aliguori | if (guess_disk_lchs(bs, &cylinders, &heads, &secs) == 0) { |
888 | f3d54fc4 | aliguori | if (heads > 16) { |
889 | f3d54fc4 | aliguori | /* if heads > 16, it means that a BIOS LBA
|
890 | f3d54fc4 | aliguori | translation was active, so the default
|
891 | f3d54fc4 | aliguori | hardware geometry is OK */
|
892 | f3d54fc4 | aliguori | lba_detected = 1;
|
893 | f3d54fc4 | aliguori | goto default_geometry;
|
894 | f3d54fc4 | aliguori | } else {
|
895 | f3d54fc4 | aliguori | *pcyls = cylinders; |
896 | f3d54fc4 | aliguori | *pheads = heads; |
897 | f3d54fc4 | aliguori | *psecs = secs; |
898 | f3d54fc4 | aliguori | /* disable any translation to be in sync with
|
899 | f3d54fc4 | aliguori | the logical geometry */
|
900 | f3d54fc4 | aliguori | if (translation == BIOS_ATA_TRANSLATION_AUTO) {
|
901 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
902 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_NONE); |
903 | f3d54fc4 | aliguori | } |
904 | f3d54fc4 | aliguori | } |
905 | f3d54fc4 | aliguori | } else {
|
906 | f3d54fc4 | aliguori | default_geometry:
|
907 | f3d54fc4 | aliguori | /* if no geometry, use a standard physical disk geometry */
|
908 | f3d54fc4 | aliguori | cylinders = nb_sectors / (16 * 63); |
909 | f3d54fc4 | aliguori | |
910 | f3d54fc4 | aliguori | if (cylinders > 16383) |
911 | f3d54fc4 | aliguori | cylinders = 16383;
|
912 | f3d54fc4 | aliguori | else if (cylinders < 2) |
913 | f3d54fc4 | aliguori | cylinders = 2;
|
914 | f3d54fc4 | aliguori | *pcyls = cylinders; |
915 | f3d54fc4 | aliguori | *pheads = 16;
|
916 | f3d54fc4 | aliguori | *psecs = 63;
|
917 | f3d54fc4 | aliguori | if ((lba_detected == 1) && (translation == BIOS_ATA_TRANSLATION_AUTO)) { |
918 | f3d54fc4 | aliguori | if ((*pcyls * *pheads) <= 131072) { |
919 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
920 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_LARGE); |
921 | f3d54fc4 | aliguori | } else {
|
922 | f3d54fc4 | aliguori | bdrv_set_translation_hint(bs, |
923 | f3d54fc4 | aliguori | BIOS_ATA_TRANSLATION_LBA); |
924 | f3d54fc4 | aliguori | } |
925 | f3d54fc4 | aliguori | } |
926 | f3d54fc4 | aliguori | } |
927 | f3d54fc4 | aliguori | bdrv_set_geometry_hint(bs, *pcyls, *pheads, *psecs); |
928 | f3d54fc4 | aliguori | } |
929 | f3d54fc4 | aliguori | } |
930 | f3d54fc4 | aliguori | |
931 | 5fafdf24 | ths | void bdrv_set_geometry_hint(BlockDriverState *bs,
|
932 | b338082b | bellard | int cyls, int heads, int secs) |
933 | b338082b | bellard | { |
934 | b338082b | bellard | bs->cyls = cyls; |
935 | b338082b | bellard | bs->heads = heads; |
936 | b338082b | bellard | bs->secs = secs; |
937 | b338082b | bellard | } |
938 | b338082b | bellard | |
939 | b338082b | bellard | void bdrv_set_type_hint(BlockDriverState *bs, int type) |
940 | b338082b | bellard | { |
941 | b338082b | bellard | bs->type = type; |
942 | b338082b | bellard | bs->removable = ((type == BDRV_TYPE_CDROM || |
943 | b338082b | bellard | type == BDRV_TYPE_FLOPPY)); |
944 | b338082b | bellard | } |
945 | b338082b | bellard | |
946 | 46d4767d | bellard | void bdrv_set_translation_hint(BlockDriverState *bs, int translation) |
947 | 46d4767d | bellard | { |
948 | 46d4767d | bellard | bs->translation = translation; |
949 | 46d4767d | bellard | } |
950 | 46d4767d | bellard | |
951 | 5fafdf24 | ths | void bdrv_get_geometry_hint(BlockDriverState *bs,
|
952 | b338082b | bellard | int *pcyls, int *pheads, int *psecs) |
953 | b338082b | bellard | { |
954 | b338082b | bellard | *pcyls = bs->cyls; |
955 | b338082b | bellard | *pheads = bs->heads; |
956 | b338082b | bellard | *psecs = bs->secs; |
957 | b338082b | bellard | } |
958 | b338082b | bellard | |
959 | b338082b | bellard | int bdrv_get_type_hint(BlockDriverState *bs)
|
960 | b338082b | bellard | { |
961 | b338082b | bellard | return bs->type;
|
962 | b338082b | bellard | } |
963 | b338082b | bellard | |
964 | 46d4767d | bellard | int bdrv_get_translation_hint(BlockDriverState *bs)
|
965 | 46d4767d | bellard | { |
966 | 46d4767d | bellard | return bs->translation;
|
967 | 46d4767d | bellard | } |
968 | 46d4767d | bellard | |
969 | b338082b | bellard | int bdrv_is_removable(BlockDriverState *bs)
|
970 | b338082b | bellard | { |
971 | b338082b | bellard | return bs->removable;
|
972 | b338082b | bellard | } |
973 | b338082b | bellard | |
974 | b338082b | bellard | int bdrv_is_read_only(BlockDriverState *bs)
|
975 | b338082b | bellard | { |
976 | b338082b | bellard | return bs->read_only;
|
977 | b338082b | bellard | } |
978 | b338082b | bellard | |
979 | 59f2689d | Naphtali Sprei | int bdrv_set_read_only(BlockDriverState *bs, int read_only) |
980 | 59f2689d | Naphtali Sprei | { |
981 | 59f2689d | Naphtali Sprei | int ret = bs->read_only;
|
982 | 59f2689d | Naphtali Sprei | bs->read_only = read_only; |
983 | 59f2689d | Naphtali Sprei | return ret;
|
984 | 59f2689d | Naphtali Sprei | } |
985 | 59f2689d | Naphtali Sprei | |
986 | 985a03b0 | ths | int bdrv_is_sg(BlockDriverState *bs)
|
987 | 985a03b0 | ths | { |
988 | 985a03b0 | ths | return bs->sg;
|
989 | 985a03b0 | ths | } |
990 | 985a03b0 | ths | |
991 | e900a7b7 | Christoph Hellwig | int bdrv_enable_write_cache(BlockDriverState *bs)
|
992 | e900a7b7 | Christoph Hellwig | { |
993 | e900a7b7 | Christoph Hellwig | return bs->enable_write_cache;
|
994 | e900a7b7 | Christoph Hellwig | } |
995 | e900a7b7 | Christoph Hellwig | |
996 | 19cb3738 | bellard | /* XXX: no longer used */
|
997 | 5fafdf24 | ths | void bdrv_set_change_cb(BlockDriverState *bs,
|
998 | b338082b | bellard | void (*change_cb)(void *opaque), void *opaque) |
999 | b338082b | bellard | { |
1000 | b338082b | bellard | bs->change_cb = change_cb; |
1001 | b338082b | bellard | bs->change_opaque = opaque; |
1002 | b338082b | bellard | } |
1003 | b338082b | bellard | |
1004 | ea2384d3 | bellard | int bdrv_is_encrypted(BlockDriverState *bs)
|
1005 | ea2384d3 | bellard | { |
1006 | ea2384d3 | bellard | if (bs->backing_hd && bs->backing_hd->encrypted)
|
1007 | ea2384d3 | bellard | return 1; |
1008 | ea2384d3 | bellard | return bs->encrypted;
|
1009 | ea2384d3 | bellard | } |
1010 | ea2384d3 | bellard | |
1011 | c0f4ce77 | aliguori | int bdrv_key_required(BlockDriverState *bs)
|
1012 | c0f4ce77 | aliguori | { |
1013 | c0f4ce77 | aliguori | BlockDriverState *backing_hd = bs->backing_hd; |
1014 | c0f4ce77 | aliguori | |
1015 | c0f4ce77 | aliguori | if (backing_hd && backing_hd->encrypted && !backing_hd->valid_key)
|
1016 | c0f4ce77 | aliguori | return 1; |
1017 | c0f4ce77 | aliguori | return (bs->encrypted && !bs->valid_key);
|
1018 | c0f4ce77 | aliguori | } |
1019 | c0f4ce77 | aliguori | |
1020 | ea2384d3 | bellard | int bdrv_set_key(BlockDriverState *bs, const char *key) |
1021 | ea2384d3 | bellard | { |
1022 | ea2384d3 | bellard | int ret;
|
1023 | ea2384d3 | bellard | if (bs->backing_hd && bs->backing_hd->encrypted) {
|
1024 | ea2384d3 | bellard | ret = bdrv_set_key(bs->backing_hd, key); |
1025 | ea2384d3 | bellard | if (ret < 0) |
1026 | ea2384d3 | bellard | return ret;
|
1027 | ea2384d3 | bellard | if (!bs->encrypted)
|
1028 | ea2384d3 | bellard | return 0; |
1029 | ea2384d3 | bellard | } |
1030 | ea2384d3 | bellard | if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
|
1031 | ea2384d3 | bellard | return -1; |
1032 | c0f4ce77 | aliguori | ret = bs->drv->bdrv_set_key(bs, key); |
1033 | bb5fc20f | aliguori | if (ret < 0) { |
1034 | bb5fc20f | aliguori | bs->valid_key = 0;
|
1035 | bb5fc20f | aliguori | } else if (!bs->valid_key) { |
1036 | bb5fc20f | aliguori | bs->valid_key = 1;
|
1037 | bb5fc20f | aliguori | /* call the change callback now, we skipped it on open */
|
1038 | bb5fc20f | aliguori | bs->media_changed = 1;
|
1039 | bb5fc20f | aliguori | if (bs->change_cb)
|
1040 | bb5fc20f | aliguori | bs->change_cb(bs->change_opaque); |
1041 | bb5fc20f | aliguori | } |
1042 | c0f4ce77 | aliguori | return ret;
|
1043 | ea2384d3 | bellard | } |
1044 | ea2384d3 | bellard | |
1045 | ea2384d3 | bellard | void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size) |
1046 | ea2384d3 | bellard | { |
1047 | 19cb3738 | bellard | if (!bs->drv) {
|
1048 | ea2384d3 | bellard | buf[0] = '\0'; |
1049 | ea2384d3 | bellard | } else {
|
1050 | ea2384d3 | bellard | pstrcpy(buf, buf_size, bs->drv->format_name); |
1051 | ea2384d3 | bellard | } |
1052 | ea2384d3 | bellard | } |
1053 | ea2384d3 | bellard | |
1054 | 5fafdf24 | ths | void bdrv_iterate_format(void (*it)(void *opaque, const char *name), |
1055 | ea2384d3 | bellard | void *opaque)
|
1056 | ea2384d3 | bellard | { |
1057 | ea2384d3 | bellard | BlockDriver *drv; |
1058 | ea2384d3 | bellard | |
1059 | ea2384d3 | bellard | for (drv = first_drv; drv != NULL; drv = drv->next) { |
1060 | ea2384d3 | bellard | it(opaque, drv->format_name); |
1061 | ea2384d3 | bellard | } |
1062 | ea2384d3 | bellard | } |
1063 | ea2384d3 | bellard | |
1064 | b338082b | bellard | BlockDriverState *bdrv_find(const char *name) |
1065 | b338082b | bellard | { |
1066 | b338082b | bellard | BlockDriverState *bs; |
1067 | b338082b | bellard | |
1068 | b338082b | bellard | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1069 | b338082b | bellard | if (!strcmp(name, bs->device_name))
|
1070 | b338082b | bellard | return bs;
|
1071 | b338082b | bellard | } |
1072 | b338082b | bellard | return NULL; |
1073 | b338082b | bellard | } |
1074 | b338082b | bellard | |
1075 | 51de9760 | aliguori | void bdrv_iterate(void (*it)(void *opaque, BlockDriverState *bs), void *opaque) |
1076 | 81d0912d | bellard | { |
1077 | 81d0912d | bellard | BlockDriverState *bs; |
1078 | 81d0912d | bellard | |
1079 | 81d0912d | bellard | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1080 | 51de9760 | aliguori | it(opaque, bs); |
1081 | 81d0912d | bellard | } |
1082 | 81d0912d | bellard | } |
1083 | 81d0912d | bellard | |
1084 | ea2384d3 | bellard | const char *bdrv_get_device_name(BlockDriverState *bs) |
1085 | ea2384d3 | bellard | { |
1086 | ea2384d3 | bellard | return bs->device_name;
|
1087 | ea2384d3 | bellard | } |
1088 | ea2384d3 | bellard | |
1089 | 7a6cba61 | pbrook | void bdrv_flush(BlockDriverState *bs)
|
1090 | 7a6cba61 | pbrook | { |
1091 | 081501da | aliguori | if (!bs->drv)
|
1092 | 081501da | aliguori | return;
|
1093 | 7a6cba61 | pbrook | if (bs->drv->bdrv_flush)
|
1094 | 7a6cba61 | pbrook | bs->drv->bdrv_flush(bs); |
1095 | 7a6cba61 | pbrook | if (bs->backing_hd)
|
1096 | 7a6cba61 | pbrook | bdrv_flush(bs->backing_hd); |
1097 | 7a6cba61 | pbrook | } |
1098 | 7a6cba61 | pbrook | |
1099 | c6ca28d6 | aliguori | void bdrv_flush_all(void) |
1100 | c6ca28d6 | aliguori | { |
1101 | c6ca28d6 | aliguori | BlockDriverState *bs; |
1102 | c6ca28d6 | aliguori | |
1103 | c6ca28d6 | aliguori | for (bs = bdrv_first; bs != NULL; bs = bs->next) |
1104 | c6ca28d6 | aliguori | if (bs->drv && !bdrv_is_read_only(bs) &&
|
1105 | c6ca28d6 | aliguori | (!bdrv_is_removable(bs) || bdrv_is_inserted(bs))) |
1106 | c6ca28d6 | aliguori | bdrv_flush(bs); |
1107 | c6ca28d6 | aliguori | } |
1108 | c6ca28d6 | aliguori | |
1109 | f58c7b35 | ths | /*
|
1110 | f58c7b35 | ths | * Returns true iff the specified sector is present in the disk image. Drivers
|
1111 | f58c7b35 | ths | * not implementing the functionality are assumed to not support backing files,
|
1112 | f58c7b35 | ths | * hence all their sectors are reported as allocated.
|
1113 | f58c7b35 | ths | *
|
1114 | f58c7b35 | ths | * 'pnum' is set to the number of sectors (including and immediately following
|
1115 | f58c7b35 | ths | * the specified sector) that are known to be in the same
|
1116 | f58c7b35 | ths | * allocated/unallocated state.
|
1117 | f58c7b35 | ths | *
|
1118 | f58c7b35 | ths | * 'nb_sectors' is the max value 'pnum' should be set to.
|
1119 | f58c7b35 | ths | */
|
1120 | f58c7b35 | ths | int bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, int nb_sectors, |
1121 | f58c7b35 | ths | int *pnum)
|
1122 | f58c7b35 | ths | { |
1123 | f58c7b35 | ths | int64_t n; |
1124 | f58c7b35 | ths | if (!bs->drv->bdrv_is_allocated) {
|
1125 | f58c7b35 | ths | if (sector_num >= bs->total_sectors) {
|
1126 | f58c7b35 | ths | *pnum = 0;
|
1127 | f58c7b35 | ths | return 0; |
1128 | f58c7b35 | ths | } |
1129 | f58c7b35 | ths | n = bs->total_sectors - sector_num; |
1130 | f58c7b35 | ths | *pnum = (n < nb_sectors) ? (n) : (nb_sectors); |
1131 | f58c7b35 | ths | return 1; |
1132 | f58c7b35 | ths | } |
1133 | f58c7b35 | ths | return bs->drv->bdrv_is_allocated(bs, sector_num, nb_sectors, pnum);
|
1134 | f58c7b35 | ths | } |
1135 | f58c7b35 | ths | |
1136 | 376253ec | aliguori | void bdrv_info(Monitor *mon)
|
1137 | b338082b | bellard | { |
1138 | b338082b | bellard | BlockDriverState *bs; |
1139 | b338082b | bellard | |
1140 | b338082b | bellard | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1141 | 376253ec | aliguori | monitor_printf(mon, "%s:", bs->device_name);
|
1142 | 376253ec | aliguori | monitor_printf(mon, " type=");
|
1143 | b338082b | bellard | switch(bs->type) {
|
1144 | b338082b | bellard | case BDRV_TYPE_HD:
|
1145 | 376253ec | aliguori | monitor_printf(mon, "hd");
|
1146 | b338082b | bellard | break;
|
1147 | b338082b | bellard | case BDRV_TYPE_CDROM:
|
1148 | 376253ec | aliguori | monitor_printf(mon, "cdrom");
|
1149 | b338082b | bellard | break;
|
1150 | b338082b | bellard | case BDRV_TYPE_FLOPPY:
|
1151 | 376253ec | aliguori | monitor_printf(mon, "floppy");
|
1152 | b338082b | bellard | break;
|
1153 | b338082b | bellard | } |
1154 | 376253ec | aliguori | monitor_printf(mon, " removable=%d", bs->removable);
|
1155 | b338082b | bellard | if (bs->removable) {
|
1156 | 376253ec | aliguori | monitor_printf(mon, " locked=%d", bs->locked);
|
1157 | b338082b | bellard | } |
1158 | 19cb3738 | bellard | if (bs->drv) {
|
1159 | 376253ec | aliguori | monitor_printf(mon, " file=");
|
1160 | 376253ec | aliguori | monitor_print_filename(mon, bs->filename); |
1161 | fef30743 | ths | if (bs->backing_file[0] != '\0') { |
1162 | 376253ec | aliguori | monitor_printf(mon, " backing_file=");
|
1163 | 376253ec | aliguori | monitor_print_filename(mon, bs->backing_file); |
1164 | 376253ec | aliguori | } |
1165 | 376253ec | aliguori | monitor_printf(mon, " ro=%d", bs->read_only);
|
1166 | 376253ec | aliguori | monitor_printf(mon, " drv=%s", bs->drv->format_name);
|
1167 | 376253ec | aliguori | monitor_printf(mon, " encrypted=%d", bdrv_is_encrypted(bs));
|
1168 | b338082b | bellard | } else {
|
1169 | 376253ec | aliguori | monitor_printf(mon, " [not inserted]");
|
1170 | b338082b | bellard | } |
1171 | 376253ec | aliguori | monitor_printf(mon, "\n");
|
1172 | b338082b | bellard | } |
1173 | b338082b | bellard | } |
1174 | a36e69dd | ths | |
1175 | a36e69dd | ths | /* The "info blockstats" command. */
|
1176 | 376253ec | aliguori | void bdrv_info_stats(Monitor *mon)
|
1177 | a36e69dd | ths | { |
1178 | a36e69dd | ths | BlockDriverState *bs; |
1179 | a36e69dd | ths | |
1180 | a36e69dd | ths | for (bs = bdrv_first; bs != NULL; bs = bs->next) { |
1181 | 376253ec | aliguori | monitor_printf(mon, "%s:"
|
1182 | 376253ec | aliguori | " rd_bytes=%" PRIu64
|
1183 | 376253ec | aliguori | " wr_bytes=%" PRIu64
|
1184 | 376253ec | aliguori | " rd_operations=%" PRIu64
|
1185 | 376253ec | aliguori | " wr_operations=%" PRIu64
|
1186 | ebf53fcd | aliguori | "\n",
|
1187 | 376253ec | aliguori | bs->device_name, |
1188 | 376253ec | aliguori | bs->rd_bytes, bs->wr_bytes, |
1189 | 376253ec | aliguori | bs->rd_ops, bs->wr_ops); |
1190 | a36e69dd | ths | } |
1191 | a36e69dd | ths | } |
1192 | ea2384d3 | bellard | |
1193 | 045df330 | aliguori | const char *bdrv_get_encrypted_filename(BlockDriverState *bs) |
1194 | 045df330 | aliguori | { |
1195 | 045df330 | aliguori | if (bs->backing_hd && bs->backing_hd->encrypted)
|
1196 | 045df330 | aliguori | return bs->backing_file;
|
1197 | 045df330 | aliguori | else if (bs->encrypted) |
1198 | 045df330 | aliguori | return bs->filename;
|
1199 | 045df330 | aliguori | else
|
1200 | 045df330 | aliguori | return NULL; |
1201 | 045df330 | aliguori | } |
1202 | 045df330 | aliguori | |
1203 | 5fafdf24 | ths | void bdrv_get_backing_filename(BlockDriverState *bs,
|
1204 | 83f64091 | bellard | char *filename, int filename_size) |
1205 | 83f64091 | bellard | { |
1206 | 83f64091 | bellard | if (!bs->backing_hd) {
|
1207 | 83f64091 | bellard | pstrcpy(filename, filename_size, "");
|
1208 | 83f64091 | bellard | } else {
|
1209 | 83f64091 | bellard | pstrcpy(filename, filename_size, bs->backing_file); |
1210 | 83f64091 | bellard | } |
1211 | 83f64091 | bellard | } |
1212 | 83f64091 | bellard | |
1213 | 5fafdf24 | ths | int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
|
1214 | faea38e7 | bellard | const uint8_t *buf, int nb_sectors) |
1215 | faea38e7 | bellard | { |
1216 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1217 | faea38e7 | bellard | if (!drv)
|
1218 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1219 | faea38e7 | bellard | if (!drv->bdrv_write_compressed)
|
1220 | faea38e7 | bellard | return -ENOTSUP;
|
1221 | fbb7b4e0 | Kevin Wolf | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1222 | fbb7b4e0 | Kevin Wolf | return -EIO;
|
1223 | 7cd1e32a | lirans@il.ibm.com | |
1224 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_tracking) {
|
1225 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1226 | 7cd1e32a | lirans@il.ibm.com | } |
1227 | 7cd1e32a | lirans@il.ibm.com | |
1228 | faea38e7 | bellard | return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
|
1229 | faea38e7 | bellard | } |
1230 | 3b46e624 | ths | |
1231 | faea38e7 | bellard | int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
|
1232 | faea38e7 | bellard | { |
1233 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1234 | faea38e7 | bellard | if (!drv)
|
1235 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1236 | faea38e7 | bellard | if (!drv->bdrv_get_info)
|
1237 | faea38e7 | bellard | return -ENOTSUP;
|
1238 | faea38e7 | bellard | memset(bdi, 0, sizeof(*bdi)); |
1239 | faea38e7 | bellard | return drv->bdrv_get_info(bs, bdi);
|
1240 | faea38e7 | bellard | } |
1241 | faea38e7 | bellard | |
1242 | 45566e9c | Christoph Hellwig | int bdrv_save_vmstate(BlockDriverState *bs, const uint8_t *buf, |
1243 | 45566e9c | Christoph Hellwig | int64_t pos, int size)
|
1244 | 178e08a5 | aliguori | { |
1245 | 178e08a5 | aliguori | BlockDriver *drv = bs->drv; |
1246 | 178e08a5 | aliguori | if (!drv)
|
1247 | 178e08a5 | aliguori | return -ENOMEDIUM;
|
1248 | 45566e9c | Christoph Hellwig | if (!drv->bdrv_save_vmstate)
|
1249 | 178e08a5 | aliguori | return -ENOTSUP;
|
1250 | 45566e9c | Christoph Hellwig | return drv->bdrv_save_vmstate(bs, buf, pos, size);
|
1251 | 178e08a5 | aliguori | } |
1252 | 178e08a5 | aliguori | |
1253 | 45566e9c | Christoph Hellwig | int bdrv_load_vmstate(BlockDriverState *bs, uint8_t *buf,
|
1254 | 45566e9c | Christoph Hellwig | int64_t pos, int size)
|
1255 | 178e08a5 | aliguori | { |
1256 | 178e08a5 | aliguori | BlockDriver *drv = bs->drv; |
1257 | 178e08a5 | aliguori | if (!drv)
|
1258 | 178e08a5 | aliguori | return -ENOMEDIUM;
|
1259 | 45566e9c | Christoph Hellwig | if (!drv->bdrv_load_vmstate)
|
1260 | 178e08a5 | aliguori | return -ENOTSUP;
|
1261 | 45566e9c | Christoph Hellwig | return drv->bdrv_load_vmstate(bs, buf, pos, size);
|
1262 | 178e08a5 | aliguori | } |
1263 | 178e08a5 | aliguori | |
1264 | faea38e7 | bellard | /**************************************************************/
|
1265 | faea38e7 | bellard | /* handling of snapshots */
|
1266 | faea38e7 | bellard | |
1267 | 5fafdf24 | ths | int bdrv_snapshot_create(BlockDriverState *bs,
|
1268 | faea38e7 | bellard | QEMUSnapshotInfo *sn_info) |
1269 | faea38e7 | bellard | { |
1270 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1271 | faea38e7 | bellard | if (!drv)
|
1272 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1273 | faea38e7 | bellard | if (!drv->bdrv_snapshot_create)
|
1274 | faea38e7 | bellard | return -ENOTSUP;
|
1275 | faea38e7 | bellard | return drv->bdrv_snapshot_create(bs, sn_info);
|
1276 | faea38e7 | bellard | } |
1277 | faea38e7 | bellard | |
1278 | 5fafdf24 | ths | int bdrv_snapshot_goto(BlockDriverState *bs,
|
1279 | faea38e7 | bellard | const char *snapshot_id) |
1280 | faea38e7 | bellard | { |
1281 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1282 | faea38e7 | bellard | if (!drv)
|
1283 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1284 | faea38e7 | bellard | if (!drv->bdrv_snapshot_goto)
|
1285 | faea38e7 | bellard | return -ENOTSUP;
|
1286 | faea38e7 | bellard | return drv->bdrv_snapshot_goto(bs, snapshot_id);
|
1287 | faea38e7 | bellard | } |
1288 | faea38e7 | bellard | |
1289 | faea38e7 | bellard | int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id) |
1290 | faea38e7 | bellard | { |
1291 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1292 | faea38e7 | bellard | if (!drv)
|
1293 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1294 | faea38e7 | bellard | if (!drv->bdrv_snapshot_delete)
|
1295 | faea38e7 | bellard | return -ENOTSUP;
|
1296 | faea38e7 | bellard | return drv->bdrv_snapshot_delete(bs, snapshot_id);
|
1297 | faea38e7 | bellard | } |
1298 | faea38e7 | bellard | |
1299 | 5fafdf24 | ths | int bdrv_snapshot_list(BlockDriverState *bs,
|
1300 | faea38e7 | bellard | QEMUSnapshotInfo **psn_info) |
1301 | faea38e7 | bellard | { |
1302 | faea38e7 | bellard | BlockDriver *drv = bs->drv; |
1303 | faea38e7 | bellard | if (!drv)
|
1304 | 19cb3738 | bellard | return -ENOMEDIUM;
|
1305 | faea38e7 | bellard | if (!drv->bdrv_snapshot_list)
|
1306 | faea38e7 | bellard | return -ENOTSUP;
|
1307 | faea38e7 | bellard | return drv->bdrv_snapshot_list(bs, psn_info);
|
1308 | faea38e7 | bellard | } |
1309 | faea38e7 | bellard | |
1310 | faea38e7 | bellard | #define NB_SUFFIXES 4 |
1311 | faea38e7 | bellard | |
1312 | faea38e7 | bellard | char *get_human_readable_size(char *buf, int buf_size, int64_t size) |
1313 | faea38e7 | bellard | { |
1314 | faea38e7 | bellard | static const char suffixes[NB_SUFFIXES] = "KMGT"; |
1315 | faea38e7 | bellard | int64_t base; |
1316 | faea38e7 | bellard | int i;
|
1317 | faea38e7 | bellard | |
1318 | faea38e7 | bellard | if (size <= 999) { |
1319 | faea38e7 | bellard | snprintf(buf, buf_size, "%" PRId64, size);
|
1320 | faea38e7 | bellard | } else {
|
1321 | faea38e7 | bellard | base = 1024;
|
1322 | faea38e7 | bellard | for(i = 0; i < NB_SUFFIXES; i++) { |
1323 | faea38e7 | bellard | if (size < (10 * base)) { |
1324 | 5fafdf24 | ths | snprintf(buf, buf_size, "%0.1f%c",
|
1325 | faea38e7 | bellard | (double)size / base,
|
1326 | faea38e7 | bellard | suffixes[i]); |
1327 | faea38e7 | bellard | break;
|
1328 | faea38e7 | bellard | } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) { |
1329 | 5fafdf24 | ths | snprintf(buf, buf_size, "%" PRId64 "%c", |
1330 | faea38e7 | bellard | ((size + (base >> 1)) / base),
|
1331 | faea38e7 | bellard | suffixes[i]); |
1332 | faea38e7 | bellard | break;
|
1333 | faea38e7 | bellard | } |
1334 | faea38e7 | bellard | base = base * 1024;
|
1335 | faea38e7 | bellard | } |
1336 | faea38e7 | bellard | } |
1337 | faea38e7 | bellard | return buf;
|
1338 | faea38e7 | bellard | } |
1339 | faea38e7 | bellard | |
1340 | faea38e7 | bellard | char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn) |
1341 | faea38e7 | bellard | { |
1342 | faea38e7 | bellard | char buf1[128], date_buf[128], clock_buf[128]; |
1343 | 3b9f94e1 | bellard | #ifdef _WIN32
|
1344 | 3b9f94e1 | bellard | struct tm *ptm;
|
1345 | 3b9f94e1 | bellard | #else
|
1346 | faea38e7 | bellard | struct tm tm;
|
1347 | 3b9f94e1 | bellard | #endif
|
1348 | faea38e7 | bellard | time_t ti; |
1349 | faea38e7 | bellard | int64_t secs; |
1350 | faea38e7 | bellard | |
1351 | faea38e7 | bellard | if (!sn) {
|
1352 | 5fafdf24 | ths | snprintf(buf, buf_size, |
1353 | 5fafdf24 | ths | "%-10s%-20s%7s%20s%15s",
|
1354 | faea38e7 | bellard | "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); |
1355 | faea38e7 | bellard | } else {
|
1356 | faea38e7 | bellard | ti = sn->date_sec; |
1357 | 3b9f94e1 | bellard | #ifdef _WIN32
|
1358 | 3b9f94e1 | bellard | ptm = localtime(&ti); |
1359 | 3b9f94e1 | bellard | strftime(date_buf, sizeof(date_buf),
|
1360 | 3b9f94e1 | bellard | "%Y-%m-%d %H:%M:%S", ptm);
|
1361 | 3b9f94e1 | bellard | #else
|
1362 | faea38e7 | bellard | localtime_r(&ti, &tm); |
1363 | faea38e7 | bellard | strftime(date_buf, sizeof(date_buf),
|
1364 | faea38e7 | bellard | "%Y-%m-%d %H:%M:%S", &tm);
|
1365 | 3b9f94e1 | bellard | #endif
|
1366 | faea38e7 | bellard | secs = sn->vm_clock_nsec / 1000000000;
|
1367 | faea38e7 | bellard | snprintf(clock_buf, sizeof(clock_buf),
|
1368 | faea38e7 | bellard | "%02d:%02d:%02d.%03d",
|
1369 | faea38e7 | bellard | (int)(secs / 3600), |
1370 | faea38e7 | bellard | (int)((secs / 60) % 60), |
1371 | 5fafdf24 | ths | (int)(secs % 60), |
1372 | faea38e7 | bellard | (int)((sn->vm_clock_nsec / 1000000) % 1000)); |
1373 | faea38e7 | bellard | snprintf(buf, buf_size, |
1374 | 5fafdf24 | ths | "%-10s%-20s%7s%20s%15s",
|
1375 | faea38e7 | bellard | sn->id_str, sn->name, |
1376 | faea38e7 | bellard | get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
|
1377 | faea38e7 | bellard | date_buf, |
1378 | faea38e7 | bellard | clock_buf); |
1379 | faea38e7 | bellard | } |
1380 | faea38e7 | bellard | return buf;
|
1381 | faea38e7 | bellard | } |
1382 | faea38e7 | bellard | |
1383 | 83f64091 | bellard | |
1384 | ea2384d3 | bellard | /**************************************************************/
|
1385 | 83f64091 | bellard | /* async I/Os */
|
1386 | ea2384d3 | bellard | |
1387 | 3b69e4b9 | aliguori | BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num, |
1388 | f141eafe | aliguori | QEMUIOVector *qiov, int nb_sectors,
|
1389 | 3b69e4b9 | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1390 | 3b69e4b9 | aliguori | { |
1391 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
1392 | a36e69dd | ths | BlockDriverAIOCB *ret; |
1393 | 83f64091 | bellard | |
1394 | 19cb3738 | bellard | if (!drv)
|
1395 | ce1a14dc | pbrook | return NULL; |
1396 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1397 | 71d0770c | aliguori | return NULL; |
1398 | 3b46e624 | ths | |
1399 | f141eafe | aliguori | ret = drv->bdrv_aio_readv(bs, sector_num, qiov, nb_sectors, |
1400 | f141eafe | aliguori | cb, opaque); |
1401 | a36e69dd | ths | |
1402 | a36e69dd | ths | if (ret) {
|
1403 | a36e69dd | ths | /* Update stats even though technically transfer has not happened. */
|
1404 | a36e69dd | ths | bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1405 | a36e69dd | ths | bs->rd_ops ++; |
1406 | a36e69dd | ths | } |
1407 | a36e69dd | ths | |
1408 | a36e69dd | ths | return ret;
|
1409 | ea2384d3 | bellard | } |
1410 | ea2384d3 | bellard | |
1411 | f141eafe | aliguori | BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num, |
1412 | f141eafe | aliguori | QEMUIOVector *qiov, int nb_sectors,
|
1413 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1414 | ea2384d3 | bellard | { |
1415 | 83f64091 | bellard | BlockDriver *drv = bs->drv; |
1416 | a36e69dd | ths | BlockDriverAIOCB *ret; |
1417 | ea2384d3 | bellard | |
1418 | 19cb3738 | bellard | if (!drv)
|
1419 | ce1a14dc | pbrook | return NULL; |
1420 | 83f64091 | bellard | if (bs->read_only)
|
1421 | ce1a14dc | pbrook | return NULL; |
1422 | 71d0770c | aliguori | if (bdrv_check_request(bs, sector_num, nb_sectors))
|
1423 | 71d0770c | aliguori | return NULL; |
1424 | 83f64091 | bellard | |
1425 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_tracking) {
|
1426 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
|
1427 | 7cd1e32a | lirans@il.ibm.com | } |
1428 | 7cd1e32a | lirans@il.ibm.com | |
1429 | f141eafe | aliguori | ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors, |
1430 | f141eafe | aliguori | cb, opaque); |
1431 | a36e69dd | ths | |
1432 | a36e69dd | ths | if (ret) {
|
1433 | a36e69dd | ths | /* Update stats even though technically transfer has not happened. */
|
1434 | a36e69dd | ths | bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
|
1435 | a36e69dd | ths | bs->wr_ops ++; |
1436 | a36e69dd | ths | } |
1437 | a36e69dd | ths | |
1438 | a36e69dd | ths | return ret;
|
1439 | 83f64091 | bellard | } |
1440 | 83f64091 | bellard | |
1441 | 40b4f539 | Kevin Wolf | |
1442 | 40b4f539 | Kevin Wolf | typedef struct MultiwriteCB { |
1443 | 40b4f539 | Kevin Wolf | int error;
|
1444 | 40b4f539 | Kevin Wolf | int num_requests;
|
1445 | 40b4f539 | Kevin Wolf | int num_callbacks;
|
1446 | 40b4f539 | Kevin Wolf | struct {
|
1447 | 40b4f539 | Kevin Wolf | BlockDriverCompletionFunc *cb; |
1448 | 40b4f539 | Kevin Wolf | void *opaque;
|
1449 | 40b4f539 | Kevin Wolf | QEMUIOVector *free_qiov; |
1450 | 40b4f539 | Kevin Wolf | void *free_buf;
|
1451 | 40b4f539 | Kevin Wolf | } callbacks[]; |
1452 | 40b4f539 | Kevin Wolf | } MultiwriteCB; |
1453 | 40b4f539 | Kevin Wolf | |
1454 | 40b4f539 | Kevin Wolf | static void multiwrite_user_cb(MultiwriteCB *mcb) |
1455 | 40b4f539 | Kevin Wolf | { |
1456 | 40b4f539 | Kevin Wolf | int i;
|
1457 | 40b4f539 | Kevin Wolf | |
1458 | 40b4f539 | Kevin Wolf | for (i = 0; i < mcb->num_callbacks; i++) { |
1459 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].cb(mcb->callbacks[i].opaque, mcb->error); |
1460 | 40b4f539 | Kevin Wolf | qemu_free(mcb->callbacks[i].free_qiov); |
1461 | 40b4f539 | Kevin Wolf | qemu_free(mcb->callbacks[i].free_buf); |
1462 | 40b4f539 | Kevin Wolf | } |
1463 | 40b4f539 | Kevin Wolf | } |
1464 | 40b4f539 | Kevin Wolf | |
1465 | 40b4f539 | Kevin Wolf | static void multiwrite_cb(void *opaque, int ret) |
1466 | 40b4f539 | Kevin Wolf | { |
1467 | 40b4f539 | Kevin Wolf | MultiwriteCB *mcb = opaque; |
1468 | 40b4f539 | Kevin Wolf | |
1469 | 40b4f539 | Kevin Wolf | if (ret < 0) { |
1470 | 40b4f539 | Kevin Wolf | mcb->error = ret; |
1471 | 40b4f539 | Kevin Wolf | multiwrite_user_cb(mcb); |
1472 | 40b4f539 | Kevin Wolf | } |
1473 | 40b4f539 | Kevin Wolf | |
1474 | 40b4f539 | Kevin Wolf | mcb->num_requests--; |
1475 | 40b4f539 | Kevin Wolf | if (mcb->num_requests == 0) { |
1476 | 40b4f539 | Kevin Wolf | if (mcb->error == 0) { |
1477 | 40b4f539 | Kevin Wolf | multiwrite_user_cb(mcb); |
1478 | 40b4f539 | Kevin Wolf | } |
1479 | 40b4f539 | Kevin Wolf | qemu_free(mcb); |
1480 | 40b4f539 | Kevin Wolf | } |
1481 | 40b4f539 | Kevin Wolf | } |
1482 | 40b4f539 | Kevin Wolf | |
1483 | 40b4f539 | Kevin Wolf | static int multiwrite_req_compare(const void *a, const void *b) |
1484 | 40b4f539 | Kevin Wolf | { |
1485 | 40b4f539 | Kevin Wolf | return (((BlockRequest*) a)->sector - ((BlockRequest*) b)->sector);
|
1486 | 40b4f539 | Kevin Wolf | } |
1487 | 40b4f539 | Kevin Wolf | |
1488 | 40b4f539 | Kevin Wolf | /*
|
1489 | 40b4f539 | Kevin Wolf | * Takes a bunch of requests and tries to merge them. Returns the number of
|
1490 | 40b4f539 | Kevin Wolf | * requests that remain after merging.
|
1491 | 40b4f539 | Kevin Wolf | */
|
1492 | 40b4f539 | Kevin Wolf | static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs, |
1493 | 40b4f539 | Kevin Wolf | int num_reqs, MultiwriteCB *mcb)
|
1494 | 40b4f539 | Kevin Wolf | { |
1495 | 40b4f539 | Kevin Wolf | int i, outidx;
|
1496 | 40b4f539 | Kevin Wolf | |
1497 | 40b4f539 | Kevin Wolf | // Sort requests by start sector
|
1498 | 40b4f539 | Kevin Wolf | qsort(reqs, num_reqs, sizeof(*reqs), &multiwrite_req_compare);
|
1499 | 40b4f539 | Kevin Wolf | |
1500 | 40b4f539 | Kevin Wolf | // Check if adjacent requests touch the same clusters. If so, combine them,
|
1501 | 40b4f539 | Kevin Wolf | // filling up gaps with zero sectors.
|
1502 | 40b4f539 | Kevin Wolf | outidx = 0;
|
1503 | 40b4f539 | Kevin Wolf | for (i = 1; i < num_reqs; i++) { |
1504 | 40b4f539 | Kevin Wolf | int merge = 0; |
1505 | 40b4f539 | Kevin Wolf | int64_t oldreq_last = reqs[outidx].sector + reqs[outidx].nb_sectors; |
1506 | 40b4f539 | Kevin Wolf | |
1507 | 40b4f539 | Kevin Wolf | // This handles the cases that are valid for all block drivers, namely
|
1508 | 40b4f539 | Kevin Wolf | // exactly sequential writes and overlapping writes.
|
1509 | 40b4f539 | Kevin Wolf | if (reqs[i].sector <= oldreq_last) {
|
1510 | 40b4f539 | Kevin Wolf | merge = 1;
|
1511 | 40b4f539 | Kevin Wolf | } |
1512 | 40b4f539 | Kevin Wolf | |
1513 | 40b4f539 | Kevin Wolf | // The block driver may decide that it makes sense to combine requests
|
1514 | 40b4f539 | Kevin Wolf | // even if there is a gap of some sectors between them. In this case,
|
1515 | 40b4f539 | Kevin Wolf | // the gap is filled with zeros (therefore only applicable for yet
|
1516 | 40b4f539 | Kevin Wolf | // unused space in format like qcow2).
|
1517 | 40b4f539 | Kevin Wolf | if (!merge && bs->drv->bdrv_merge_requests) {
|
1518 | 40b4f539 | Kevin Wolf | merge = bs->drv->bdrv_merge_requests(bs, &reqs[outidx], &reqs[i]); |
1519 | 40b4f539 | Kevin Wolf | } |
1520 | 40b4f539 | Kevin Wolf | |
1521 | 40b4f539 | Kevin Wolf | if (merge) {
|
1522 | 40b4f539 | Kevin Wolf | size_t size; |
1523 | 40b4f539 | Kevin Wolf | QEMUIOVector *qiov = qemu_mallocz(sizeof(*qiov));
|
1524 | 40b4f539 | Kevin Wolf | qemu_iovec_init(qiov, |
1525 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov->niov + reqs[i].qiov->niov + 1);
|
1526 | 40b4f539 | Kevin Wolf | |
1527 | 40b4f539 | Kevin Wolf | // Add the first request to the merged one. If the requests are
|
1528 | 40b4f539 | Kevin Wolf | // overlapping, drop the last sectors of the first request.
|
1529 | 40b4f539 | Kevin Wolf | size = (reqs[i].sector - reqs[outidx].sector) << 9;
|
1530 | 40b4f539 | Kevin Wolf | qemu_iovec_concat(qiov, reqs[outidx].qiov, size); |
1531 | 40b4f539 | Kevin Wolf | |
1532 | 40b4f539 | Kevin Wolf | // We might need to add some zeros between the two requests
|
1533 | 40b4f539 | Kevin Wolf | if (reqs[i].sector > oldreq_last) {
|
1534 | 40b4f539 | Kevin Wolf | size_t zero_bytes = (reqs[i].sector - oldreq_last) << 9;
|
1535 | 40b4f539 | Kevin Wolf | uint8_t *buf = qemu_blockalign(bs, zero_bytes); |
1536 | 40b4f539 | Kevin Wolf | memset(buf, 0, zero_bytes);
|
1537 | 40b4f539 | Kevin Wolf | qemu_iovec_add(qiov, buf, zero_bytes); |
1538 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].free_buf = buf; |
1539 | 40b4f539 | Kevin Wolf | } |
1540 | 40b4f539 | Kevin Wolf | |
1541 | 40b4f539 | Kevin Wolf | // Add the second request
|
1542 | 40b4f539 | Kevin Wolf | qemu_iovec_concat(qiov, reqs[i].qiov, reqs[i].qiov->size); |
1543 | 40b4f539 | Kevin Wolf | |
1544 | 40b4f539 | Kevin Wolf | reqs[outidx].nb_sectors += reqs[i].nb_sectors; |
1545 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov = qiov; |
1546 | 40b4f539 | Kevin Wolf | |
1547 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].free_qiov = reqs[outidx].qiov; |
1548 | 40b4f539 | Kevin Wolf | } else {
|
1549 | 40b4f539 | Kevin Wolf | outidx++; |
1550 | 40b4f539 | Kevin Wolf | reqs[outidx].sector = reqs[i].sector; |
1551 | 40b4f539 | Kevin Wolf | reqs[outidx].nb_sectors = reqs[i].nb_sectors; |
1552 | 40b4f539 | Kevin Wolf | reqs[outidx].qiov = reqs[i].qiov; |
1553 | 40b4f539 | Kevin Wolf | } |
1554 | 40b4f539 | Kevin Wolf | } |
1555 | 40b4f539 | Kevin Wolf | |
1556 | 40b4f539 | Kevin Wolf | return outidx + 1; |
1557 | 40b4f539 | Kevin Wolf | } |
1558 | 40b4f539 | Kevin Wolf | |
1559 | 40b4f539 | Kevin Wolf | /*
|
1560 | 40b4f539 | Kevin Wolf | * Submit multiple AIO write requests at once.
|
1561 | 40b4f539 | Kevin Wolf | *
|
1562 | 40b4f539 | Kevin Wolf | * On success, the function returns 0 and all requests in the reqs array have
|
1563 | 40b4f539 | Kevin Wolf | * been submitted. In error case this function returns -1, and any of the
|
1564 | 40b4f539 | Kevin Wolf | * requests may or may not be submitted yet. In particular, this means that the
|
1565 | 40b4f539 | Kevin Wolf | * callback will be called for some of the requests, for others it won't. The
|
1566 | 40b4f539 | Kevin Wolf | * caller must check the error field of the BlockRequest to wait for the right
|
1567 | 40b4f539 | Kevin Wolf | * callbacks (if error != 0, no callback will be called).
|
1568 | 40b4f539 | Kevin Wolf | *
|
1569 | 40b4f539 | Kevin Wolf | * The implementation may modify the contents of the reqs array, e.g. to merge
|
1570 | 40b4f539 | Kevin Wolf | * requests. However, the fields opaque and error are left unmodified as they
|
1571 | 40b4f539 | Kevin Wolf | * are used to signal failure for a single request to the caller.
|
1572 | 40b4f539 | Kevin Wolf | */
|
1573 | 40b4f539 | Kevin Wolf | int bdrv_aio_multiwrite(BlockDriverState *bs, BlockRequest *reqs, int num_reqs) |
1574 | 40b4f539 | Kevin Wolf | { |
1575 | 40b4f539 | Kevin Wolf | BlockDriverAIOCB *acb; |
1576 | 40b4f539 | Kevin Wolf | MultiwriteCB *mcb; |
1577 | 40b4f539 | Kevin Wolf | int i;
|
1578 | 40b4f539 | Kevin Wolf | |
1579 | 40b4f539 | Kevin Wolf | if (num_reqs == 0) { |
1580 | 40b4f539 | Kevin Wolf | return 0; |
1581 | 40b4f539 | Kevin Wolf | } |
1582 | 40b4f539 | Kevin Wolf | |
1583 | 40b4f539 | Kevin Wolf | // Create MultiwriteCB structure
|
1584 | 40b4f539 | Kevin Wolf | mcb = qemu_mallocz(sizeof(*mcb) + num_reqs * sizeof(*mcb->callbacks)); |
1585 | 40b4f539 | Kevin Wolf | mcb->num_requests = 0;
|
1586 | 40b4f539 | Kevin Wolf | mcb->num_callbacks = num_reqs; |
1587 | 40b4f539 | Kevin Wolf | |
1588 | 40b4f539 | Kevin Wolf | for (i = 0; i < num_reqs; i++) { |
1589 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].cb = reqs[i].cb; |
1590 | 40b4f539 | Kevin Wolf | mcb->callbacks[i].opaque = reqs[i].opaque; |
1591 | 40b4f539 | Kevin Wolf | } |
1592 | 40b4f539 | Kevin Wolf | |
1593 | 40b4f539 | Kevin Wolf | // Check for mergable requests
|
1594 | 40b4f539 | Kevin Wolf | num_reqs = multiwrite_merge(bs, reqs, num_reqs, mcb); |
1595 | 40b4f539 | Kevin Wolf | |
1596 | 40b4f539 | Kevin Wolf | // Run the aio requests
|
1597 | 40b4f539 | Kevin Wolf | for (i = 0; i < num_reqs; i++) { |
1598 | 40b4f539 | Kevin Wolf | acb = bdrv_aio_writev(bs, reqs[i].sector, reqs[i].qiov, |
1599 | 40b4f539 | Kevin Wolf | reqs[i].nb_sectors, multiwrite_cb, mcb); |
1600 | 40b4f539 | Kevin Wolf | |
1601 | 40b4f539 | Kevin Wolf | if (acb == NULL) { |
1602 | 40b4f539 | Kevin Wolf | // We can only fail the whole thing if no request has been
|
1603 | 40b4f539 | Kevin Wolf | // submitted yet. Otherwise we'll wait for the submitted AIOs to
|
1604 | 40b4f539 | Kevin Wolf | // complete and report the error in the callback.
|
1605 | 40b4f539 | Kevin Wolf | if (mcb->num_requests == 0) { |
1606 | 40b4f539 | Kevin Wolf | reqs[i].error = EIO; |
1607 | 40b4f539 | Kevin Wolf | goto fail;
|
1608 | 40b4f539 | Kevin Wolf | } else {
|
1609 | 40b4f539 | Kevin Wolf | mcb->error = EIO; |
1610 | 40b4f539 | Kevin Wolf | break;
|
1611 | 40b4f539 | Kevin Wolf | } |
1612 | 40b4f539 | Kevin Wolf | } else {
|
1613 | 40b4f539 | Kevin Wolf | mcb->num_requests++; |
1614 | 40b4f539 | Kevin Wolf | } |
1615 | 40b4f539 | Kevin Wolf | } |
1616 | 40b4f539 | Kevin Wolf | |
1617 | 40b4f539 | Kevin Wolf | return 0; |
1618 | 40b4f539 | Kevin Wolf | |
1619 | 40b4f539 | Kevin Wolf | fail:
|
1620 | 40b4f539 | Kevin Wolf | free(mcb); |
1621 | 40b4f539 | Kevin Wolf | return -1; |
1622 | 40b4f539 | Kevin Wolf | } |
1623 | 40b4f539 | Kevin Wolf | |
1624 | b2e12bc6 | Christoph Hellwig | BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, |
1625 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
1626 | b2e12bc6 | Christoph Hellwig | { |
1627 | b2e12bc6 | Christoph Hellwig | BlockDriver *drv = bs->drv; |
1628 | b2e12bc6 | Christoph Hellwig | |
1629 | b2e12bc6 | Christoph Hellwig | if (!drv)
|
1630 | b2e12bc6 | Christoph Hellwig | return NULL; |
1631 | b2e12bc6 | Christoph Hellwig | |
1632 | b2e12bc6 | Christoph Hellwig | /*
|
1633 | b2e12bc6 | Christoph Hellwig | * Note that unlike bdrv_flush the driver is reponsible for flushing a
|
1634 | b2e12bc6 | Christoph Hellwig | * backing image if it exists.
|
1635 | b2e12bc6 | Christoph Hellwig | */
|
1636 | b2e12bc6 | Christoph Hellwig | return drv->bdrv_aio_flush(bs, cb, opaque);
|
1637 | b2e12bc6 | Christoph Hellwig | } |
1638 | b2e12bc6 | Christoph Hellwig | |
1639 | 83f64091 | bellard | void bdrv_aio_cancel(BlockDriverAIOCB *acb)
|
1640 | 83f64091 | bellard | { |
1641 | 6bbff9a0 | aliguori | acb->pool->cancel(acb); |
1642 | 83f64091 | bellard | } |
1643 | 83f64091 | bellard | |
1644 | ce1a14dc | pbrook | |
1645 | 83f64091 | bellard | /**************************************************************/
|
1646 | 83f64091 | bellard | /* async block device emulation */
|
1647 | 83f64091 | bellard | |
1648 | c16b5a2c | Christoph Hellwig | typedef struct BlockDriverAIOCBSync { |
1649 | c16b5a2c | Christoph Hellwig | BlockDriverAIOCB common; |
1650 | c16b5a2c | Christoph Hellwig | QEMUBH *bh; |
1651 | c16b5a2c | Christoph Hellwig | int ret;
|
1652 | c16b5a2c | Christoph Hellwig | /* vector translation state */
|
1653 | c16b5a2c | Christoph Hellwig | QEMUIOVector *qiov; |
1654 | c16b5a2c | Christoph Hellwig | uint8_t *bounce; |
1655 | c16b5a2c | Christoph Hellwig | int is_write;
|
1656 | c16b5a2c | Christoph Hellwig | } BlockDriverAIOCBSync; |
1657 | c16b5a2c | Christoph Hellwig | |
1658 | c16b5a2c | Christoph Hellwig | static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb) |
1659 | c16b5a2c | Christoph Hellwig | { |
1660 | c16b5a2c | Christoph Hellwig | BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb; |
1661 | 6a7ad299 | Dor Laor | qemu_bh_delete(acb->bh); |
1662 | 36afc451 | Avi Kivity | acb->bh = NULL;
|
1663 | c16b5a2c | Christoph Hellwig | qemu_aio_release(acb); |
1664 | c16b5a2c | Christoph Hellwig | } |
1665 | c16b5a2c | Christoph Hellwig | |
1666 | c16b5a2c | Christoph Hellwig | static AIOPool bdrv_em_aio_pool = {
|
1667 | c16b5a2c | Christoph Hellwig | .aiocb_size = sizeof(BlockDriverAIOCBSync),
|
1668 | c16b5a2c | Christoph Hellwig | .cancel = bdrv_aio_cancel_em, |
1669 | c16b5a2c | Christoph Hellwig | }; |
1670 | c16b5a2c | Christoph Hellwig | |
1671 | ce1a14dc | pbrook | static void bdrv_aio_bh_cb(void *opaque) |
1672 | 83f64091 | bellard | { |
1673 | ce1a14dc | pbrook | BlockDriverAIOCBSync *acb = opaque; |
1674 | f141eafe | aliguori | |
1675 | f141eafe | aliguori | if (!acb->is_write)
|
1676 | f141eafe | aliguori | qemu_iovec_from_buffer(acb->qiov, acb->bounce, acb->qiov->size); |
1677 | ceb42de8 | aliguori | qemu_vfree(acb->bounce); |
1678 | ce1a14dc | pbrook | acb->common.cb(acb->common.opaque, acb->ret); |
1679 | 6a7ad299 | Dor Laor | qemu_bh_delete(acb->bh); |
1680 | 36afc451 | Avi Kivity | acb->bh = NULL;
|
1681 | ce1a14dc | pbrook | qemu_aio_release(acb); |
1682 | 83f64091 | bellard | } |
1683 | beac80cd | bellard | |
1684 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_rw_vector(BlockDriverState *bs,
|
1685 | f141eafe | aliguori | int64_t sector_num, |
1686 | f141eafe | aliguori | QEMUIOVector *qiov, |
1687 | f141eafe | aliguori | int nb_sectors,
|
1688 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, |
1689 | f141eafe | aliguori | void *opaque,
|
1690 | f141eafe | aliguori | int is_write)
|
1691 | f141eafe | aliguori | |
1692 | 83f64091 | bellard | { |
1693 | ce1a14dc | pbrook | BlockDriverAIOCBSync *acb; |
1694 | ce1a14dc | pbrook | |
1695 | c16b5a2c | Christoph Hellwig | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1696 | f141eafe | aliguori | acb->is_write = is_write; |
1697 | f141eafe | aliguori | acb->qiov = qiov; |
1698 | e268ca52 | aliguori | acb->bounce = qemu_blockalign(bs, qiov->size); |
1699 | f141eafe | aliguori | |
1700 | ce1a14dc | pbrook | if (!acb->bh)
|
1701 | ce1a14dc | pbrook | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1702 | f141eafe | aliguori | |
1703 | f141eafe | aliguori | if (is_write) {
|
1704 | f141eafe | aliguori | qemu_iovec_to_buffer(acb->qiov, acb->bounce); |
1705 | f141eafe | aliguori | acb->ret = bdrv_write(bs, sector_num, acb->bounce, nb_sectors); |
1706 | f141eafe | aliguori | } else {
|
1707 | f141eafe | aliguori | acb->ret = bdrv_read(bs, sector_num, acb->bounce, nb_sectors); |
1708 | f141eafe | aliguori | } |
1709 | f141eafe | aliguori | |
1710 | ce1a14dc | pbrook | qemu_bh_schedule(acb->bh); |
1711 | f141eafe | aliguori | |
1712 | ce1a14dc | pbrook | return &acb->common;
|
1713 | beac80cd | bellard | } |
1714 | beac80cd | bellard | |
1715 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_readv_em(BlockDriverState *bs,
|
1716 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1717 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque)
|
1718 | beac80cd | bellard | { |
1719 | f141eafe | aliguori | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 0); |
1720 | f141eafe | aliguori | } |
1721 | 83f64091 | bellard | |
1722 | f141eafe | aliguori | static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs,
|
1723 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
|
1724 | f141eafe | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1725 | f141eafe | aliguori | { |
1726 | f141eafe | aliguori | return bdrv_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1); |
1727 | beac80cd | bellard | } |
1728 | beac80cd | bellard | |
1729 | b2e12bc6 | Christoph Hellwig | static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs,
|
1730 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
1731 | b2e12bc6 | Christoph Hellwig | { |
1732 | b2e12bc6 | Christoph Hellwig | BlockDriverAIOCBSync *acb; |
1733 | b2e12bc6 | Christoph Hellwig | |
1734 | b2e12bc6 | Christoph Hellwig | acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); |
1735 | b2e12bc6 | Christoph Hellwig | acb->is_write = 1; /* don't bounce in the completion hadler */ |
1736 | b2e12bc6 | Christoph Hellwig | acb->qiov = NULL;
|
1737 | b2e12bc6 | Christoph Hellwig | acb->bounce = NULL;
|
1738 | b2e12bc6 | Christoph Hellwig | acb->ret = 0;
|
1739 | b2e12bc6 | Christoph Hellwig | |
1740 | b2e12bc6 | Christoph Hellwig | if (!acb->bh)
|
1741 | b2e12bc6 | Christoph Hellwig | acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); |
1742 | b2e12bc6 | Christoph Hellwig | |
1743 | b2e12bc6 | Christoph Hellwig | bdrv_flush(bs); |
1744 | b2e12bc6 | Christoph Hellwig | qemu_bh_schedule(acb->bh); |
1745 | b2e12bc6 | Christoph Hellwig | return &acb->common;
|
1746 | b2e12bc6 | Christoph Hellwig | } |
1747 | b2e12bc6 | Christoph Hellwig | |
1748 | 83f64091 | bellard | /**************************************************************/
|
1749 | 83f64091 | bellard | /* sync block device emulation */
|
1750 | ea2384d3 | bellard | |
1751 | 83f64091 | bellard | static void bdrv_rw_em_cb(void *opaque, int ret) |
1752 | 83f64091 | bellard | { |
1753 | 83f64091 | bellard | *(int *)opaque = ret;
|
1754 | ea2384d3 | bellard | } |
1755 | ea2384d3 | bellard | |
1756 | 83f64091 | bellard | #define NOT_DONE 0x7fffffff |
1757 | 83f64091 | bellard | |
1758 | 5fafdf24 | ths | static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, |
1759 | 83f64091 | bellard | uint8_t *buf, int nb_sectors)
|
1760 | 7a6cba61 | pbrook | { |
1761 | ce1a14dc | pbrook | int async_ret;
|
1762 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
1763 | f141eafe | aliguori | struct iovec iov;
|
1764 | f141eafe | aliguori | QEMUIOVector qiov; |
1765 | 83f64091 | bellard | |
1766 | 65d6b3d8 | Kevin Wolf | async_context_push(); |
1767 | 65d6b3d8 | Kevin Wolf | |
1768 | 83f64091 | bellard | async_ret = NOT_DONE; |
1769 | 3f4cb3d3 | blueswir1 | iov.iov_base = (void *)buf;
|
1770 | f141eafe | aliguori | iov.iov_len = nb_sectors * 512;
|
1771 | f141eafe | aliguori | qemu_iovec_init_external(&qiov, &iov, 1);
|
1772 | f141eafe | aliguori | acb = bdrv_aio_readv(bs, sector_num, &qiov, nb_sectors, |
1773 | f141eafe | aliguori | bdrv_rw_em_cb, &async_ret); |
1774 | 65d6b3d8 | Kevin Wolf | if (acb == NULL) { |
1775 | 65d6b3d8 | Kevin Wolf | async_ret = -1;
|
1776 | 65d6b3d8 | Kevin Wolf | goto fail;
|
1777 | 65d6b3d8 | Kevin Wolf | } |
1778 | baf35cb9 | aliguori | |
1779 | 83f64091 | bellard | while (async_ret == NOT_DONE) {
|
1780 | 83f64091 | bellard | qemu_aio_wait(); |
1781 | 83f64091 | bellard | } |
1782 | baf35cb9 | aliguori | |
1783 | 65d6b3d8 | Kevin Wolf | |
1784 | 65d6b3d8 | Kevin Wolf | fail:
|
1785 | 65d6b3d8 | Kevin Wolf | async_context_pop(); |
1786 | 83f64091 | bellard | return async_ret;
|
1787 | 7a6cba61 | pbrook | } |
1788 | 7a6cba61 | pbrook | |
1789 | 83f64091 | bellard | static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, |
1790 | 83f64091 | bellard | const uint8_t *buf, int nb_sectors) |
1791 | 83f64091 | bellard | { |
1792 | ce1a14dc | pbrook | int async_ret;
|
1793 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
1794 | f141eafe | aliguori | struct iovec iov;
|
1795 | f141eafe | aliguori | QEMUIOVector qiov; |
1796 | 83f64091 | bellard | |
1797 | 65d6b3d8 | Kevin Wolf | async_context_push(); |
1798 | 65d6b3d8 | Kevin Wolf | |
1799 | 83f64091 | bellard | async_ret = NOT_DONE; |
1800 | f141eafe | aliguori | iov.iov_base = (void *)buf;
|
1801 | f141eafe | aliguori | iov.iov_len = nb_sectors * 512;
|
1802 | f141eafe | aliguori | qemu_iovec_init_external(&qiov, &iov, 1);
|
1803 | f141eafe | aliguori | acb = bdrv_aio_writev(bs, sector_num, &qiov, nb_sectors, |
1804 | f141eafe | aliguori | bdrv_rw_em_cb, &async_ret); |
1805 | 65d6b3d8 | Kevin Wolf | if (acb == NULL) { |
1806 | 65d6b3d8 | Kevin Wolf | async_ret = -1;
|
1807 | 65d6b3d8 | Kevin Wolf | goto fail;
|
1808 | 65d6b3d8 | Kevin Wolf | } |
1809 | 83f64091 | bellard | while (async_ret == NOT_DONE) {
|
1810 | 83f64091 | bellard | qemu_aio_wait(); |
1811 | 83f64091 | bellard | } |
1812 | 65d6b3d8 | Kevin Wolf | |
1813 | 65d6b3d8 | Kevin Wolf | fail:
|
1814 | 65d6b3d8 | Kevin Wolf | async_context_pop(); |
1815 | 83f64091 | bellard | return async_ret;
|
1816 | 83f64091 | bellard | } |
1817 | ea2384d3 | bellard | |
1818 | ea2384d3 | bellard | void bdrv_init(void) |
1819 | ea2384d3 | bellard | { |
1820 | 5efa9d5a | Anthony Liguori | module_call_init(MODULE_INIT_BLOCK); |
1821 | ea2384d3 | bellard | } |
1822 | ce1a14dc | pbrook | |
1823 | eb852011 | Markus Armbruster | void bdrv_init_with_whitelist(void) |
1824 | eb852011 | Markus Armbruster | { |
1825 | eb852011 | Markus Armbruster | use_bdrv_whitelist = 1;
|
1826 | eb852011 | Markus Armbruster | bdrv_init(); |
1827 | eb852011 | Markus Armbruster | } |
1828 | eb852011 | Markus Armbruster | |
1829 | c16b5a2c | Christoph Hellwig | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
|
1830 | c16b5a2c | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque)
|
1831 | ce1a14dc | pbrook | { |
1832 | ce1a14dc | pbrook | BlockDriverAIOCB *acb; |
1833 | ce1a14dc | pbrook | |
1834 | 6bbff9a0 | aliguori | if (pool->free_aiocb) {
|
1835 | 6bbff9a0 | aliguori | acb = pool->free_aiocb; |
1836 | 6bbff9a0 | aliguori | pool->free_aiocb = acb->next; |
1837 | ce1a14dc | pbrook | } else {
|
1838 | 6bbff9a0 | aliguori | acb = qemu_mallocz(pool->aiocb_size); |
1839 | 6bbff9a0 | aliguori | acb->pool = pool; |
1840 | ce1a14dc | pbrook | } |
1841 | ce1a14dc | pbrook | acb->bs = bs; |
1842 | ce1a14dc | pbrook | acb->cb = cb; |
1843 | ce1a14dc | pbrook | acb->opaque = opaque; |
1844 | ce1a14dc | pbrook | return acb;
|
1845 | ce1a14dc | pbrook | } |
1846 | ce1a14dc | pbrook | |
1847 | ce1a14dc | pbrook | void qemu_aio_release(void *p) |
1848 | ce1a14dc | pbrook | { |
1849 | 6bbff9a0 | aliguori | BlockDriverAIOCB *acb = (BlockDriverAIOCB *)p; |
1850 | 6bbff9a0 | aliguori | AIOPool *pool = acb->pool; |
1851 | 6bbff9a0 | aliguori | acb->next = pool->free_aiocb; |
1852 | 6bbff9a0 | aliguori | pool->free_aiocb = acb; |
1853 | ce1a14dc | pbrook | } |
1854 | 19cb3738 | bellard | |
1855 | 19cb3738 | bellard | /**************************************************************/
|
1856 | 19cb3738 | bellard | /* removable device support */
|
1857 | 19cb3738 | bellard | |
1858 | 19cb3738 | bellard | /**
|
1859 | 19cb3738 | bellard | * Return TRUE if the media is present
|
1860 | 19cb3738 | bellard | */
|
1861 | 19cb3738 | bellard | int bdrv_is_inserted(BlockDriverState *bs)
|
1862 | 19cb3738 | bellard | { |
1863 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
1864 | 19cb3738 | bellard | int ret;
|
1865 | 19cb3738 | bellard | if (!drv)
|
1866 | 19cb3738 | bellard | return 0; |
1867 | 19cb3738 | bellard | if (!drv->bdrv_is_inserted)
|
1868 | 19cb3738 | bellard | return 1; |
1869 | 19cb3738 | bellard | ret = drv->bdrv_is_inserted(bs); |
1870 | 19cb3738 | bellard | return ret;
|
1871 | 19cb3738 | bellard | } |
1872 | 19cb3738 | bellard | |
1873 | 19cb3738 | bellard | /**
|
1874 | 19cb3738 | bellard | * Return TRUE if the media changed since the last call to this
|
1875 | 5fafdf24 | ths | * function. It is currently only used for floppy disks
|
1876 | 19cb3738 | bellard | */
|
1877 | 19cb3738 | bellard | int bdrv_media_changed(BlockDriverState *bs)
|
1878 | 19cb3738 | bellard | { |
1879 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
1880 | 19cb3738 | bellard | int ret;
|
1881 | 19cb3738 | bellard | |
1882 | 19cb3738 | bellard | if (!drv || !drv->bdrv_media_changed)
|
1883 | 19cb3738 | bellard | ret = -ENOTSUP; |
1884 | 19cb3738 | bellard | else
|
1885 | 19cb3738 | bellard | ret = drv->bdrv_media_changed(bs); |
1886 | 19cb3738 | bellard | if (ret == -ENOTSUP)
|
1887 | 19cb3738 | bellard | ret = bs->media_changed; |
1888 | 19cb3738 | bellard | bs->media_changed = 0;
|
1889 | 19cb3738 | bellard | return ret;
|
1890 | 19cb3738 | bellard | } |
1891 | 19cb3738 | bellard | |
1892 | 19cb3738 | bellard | /**
|
1893 | 19cb3738 | bellard | * If eject_flag is TRUE, eject the media. Otherwise, close the tray
|
1894 | 19cb3738 | bellard | */
|
1895 | aea2a33c | Mark McLoughlin | int bdrv_eject(BlockDriverState *bs, int eject_flag) |
1896 | 19cb3738 | bellard | { |
1897 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
1898 | 19cb3738 | bellard | int ret;
|
1899 | 19cb3738 | bellard | |
1900 | aea2a33c | Mark McLoughlin | if (bs->locked) {
|
1901 | aea2a33c | Mark McLoughlin | return -EBUSY;
|
1902 | aea2a33c | Mark McLoughlin | } |
1903 | aea2a33c | Mark McLoughlin | |
1904 | 19cb3738 | bellard | if (!drv || !drv->bdrv_eject) {
|
1905 | 19cb3738 | bellard | ret = -ENOTSUP; |
1906 | 19cb3738 | bellard | } else {
|
1907 | 19cb3738 | bellard | ret = drv->bdrv_eject(bs, eject_flag); |
1908 | 19cb3738 | bellard | } |
1909 | 19cb3738 | bellard | if (ret == -ENOTSUP) {
|
1910 | 19cb3738 | bellard | if (eject_flag)
|
1911 | 19cb3738 | bellard | bdrv_close(bs); |
1912 | aea2a33c | Mark McLoughlin | ret = 0;
|
1913 | 19cb3738 | bellard | } |
1914 | aea2a33c | Mark McLoughlin | |
1915 | aea2a33c | Mark McLoughlin | return ret;
|
1916 | 19cb3738 | bellard | } |
1917 | 19cb3738 | bellard | |
1918 | 19cb3738 | bellard | int bdrv_is_locked(BlockDriverState *bs)
|
1919 | 19cb3738 | bellard | { |
1920 | 19cb3738 | bellard | return bs->locked;
|
1921 | 19cb3738 | bellard | } |
1922 | 19cb3738 | bellard | |
1923 | 19cb3738 | bellard | /**
|
1924 | 19cb3738 | bellard | * Lock or unlock the media (if it is locked, the user won't be able
|
1925 | 19cb3738 | bellard | * to eject it manually).
|
1926 | 19cb3738 | bellard | */
|
1927 | 19cb3738 | bellard | void bdrv_set_locked(BlockDriverState *bs, int locked) |
1928 | 19cb3738 | bellard | { |
1929 | 19cb3738 | bellard | BlockDriver *drv = bs->drv; |
1930 | 19cb3738 | bellard | |
1931 | 19cb3738 | bellard | bs->locked = locked; |
1932 | 19cb3738 | bellard | if (drv && drv->bdrv_set_locked) {
|
1933 | 19cb3738 | bellard | drv->bdrv_set_locked(bs, locked); |
1934 | 19cb3738 | bellard | } |
1935 | 19cb3738 | bellard | } |
1936 | 985a03b0 | ths | |
1937 | 985a03b0 | ths | /* needed for generic scsi interface */
|
1938 | 985a03b0 | ths | |
1939 | 985a03b0 | ths | int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf) |
1940 | 985a03b0 | ths | { |
1941 | 985a03b0 | ths | BlockDriver *drv = bs->drv; |
1942 | 985a03b0 | ths | |
1943 | 985a03b0 | ths | if (drv && drv->bdrv_ioctl)
|
1944 | 985a03b0 | ths | return drv->bdrv_ioctl(bs, req, buf);
|
1945 | 985a03b0 | ths | return -ENOTSUP;
|
1946 | 985a03b0 | ths | } |
1947 | 7d780669 | aliguori | |
1948 | 221f715d | aliguori | BlockDriverAIOCB *bdrv_aio_ioctl(BlockDriverState *bs, |
1949 | 221f715d | aliguori | unsigned long int req, void *buf, |
1950 | 221f715d | aliguori | BlockDriverCompletionFunc *cb, void *opaque)
|
1951 | 7d780669 | aliguori | { |
1952 | 221f715d | aliguori | BlockDriver *drv = bs->drv; |
1953 | 7d780669 | aliguori | |
1954 | 221f715d | aliguori | if (drv && drv->bdrv_aio_ioctl)
|
1955 | 221f715d | aliguori | return drv->bdrv_aio_ioctl(bs, req, buf, cb, opaque);
|
1956 | 221f715d | aliguori | return NULL; |
1957 | 7d780669 | aliguori | } |
1958 | e268ca52 | aliguori | |
1959 | 7cd1e32a | lirans@il.ibm.com | |
1960 | 7cd1e32a | lirans@il.ibm.com | |
1961 | e268ca52 | aliguori | void *qemu_blockalign(BlockDriverState *bs, size_t size)
|
1962 | e268ca52 | aliguori | { |
1963 | e268ca52 | aliguori | return qemu_memalign((bs && bs->buffer_alignment) ? bs->buffer_alignment : 512, size); |
1964 | e268ca52 | aliguori | } |
1965 | 7cd1e32a | lirans@il.ibm.com | |
1966 | 7cd1e32a | lirans@il.ibm.com | void bdrv_set_dirty_tracking(BlockDriverState *bs, int enable) |
1967 | 7cd1e32a | lirans@il.ibm.com | { |
1968 | 7cd1e32a | lirans@il.ibm.com | int64_t bitmap_size; |
1969 | 7cd1e32a | lirans@il.ibm.com | if(enable) {
|
1970 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_tracking == 0) { |
1971 | 7cd1e32a | lirans@il.ibm.com | int64_t i; |
1972 | 7cd1e32a | lirans@il.ibm.com | uint8_t test; |
1973 | 7cd1e32a | lirans@il.ibm.com | bitmap_size = (bdrv_getlength(bs) >> SECTOR_BITS); |
1974 | 7cd1e32a | lirans@il.ibm.com | bitmap_size /= SECTORS_PER_DIRTY_CHUNK; |
1975 | 7cd1e32a | lirans@il.ibm.com | bitmap_size++; |
1976 | 7cd1e32a | lirans@il.ibm.com | |
1977 | 7cd1e32a | lirans@il.ibm.com | bs->dirty_bitmap = qemu_mallocz(bitmap_size); |
1978 | 7cd1e32a | lirans@il.ibm.com | |
1979 | 7cd1e32a | lirans@il.ibm.com | bs->dirty_tracking = enable; |
1980 | 7cd1e32a | lirans@il.ibm.com | for(i = 0; i < bitmap_size; i++) test = bs->dirty_bitmap[i]; |
1981 | 7cd1e32a | lirans@il.ibm.com | } |
1982 | 7cd1e32a | lirans@il.ibm.com | } else {
|
1983 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_tracking != 0) { |
1984 | 7cd1e32a | lirans@il.ibm.com | qemu_free(bs->dirty_bitmap); |
1985 | 7cd1e32a | lirans@il.ibm.com | bs->dirty_tracking = enable; |
1986 | 7cd1e32a | lirans@il.ibm.com | } |
1987 | 7cd1e32a | lirans@il.ibm.com | } |
1988 | 7cd1e32a | lirans@il.ibm.com | } |
1989 | 7cd1e32a | lirans@il.ibm.com | |
1990 | 7cd1e32a | lirans@il.ibm.com | int bdrv_get_dirty(BlockDriverState *bs, int64_t sector)
|
1991 | 7cd1e32a | lirans@il.ibm.com | { |
1992 | 7cd1e32a | lirans@il.ibm.com | int64_t chunk = sector / (int64_t)SECTORS_PER_DIRTY_CHUNK; |
1993 | 7cd1e32a | lirans@il.ibm.com | |
1994 | 7cd1e32a | lirans@il.ibm.com | if(bs->dirty_bitmap != NULL && |
1995 | 7cd1e32a | lirans@il.ibm.com | (sector << SECTOR_BITS) <= bdrv_getlength(bs)) { |
1996 | 7cd1e32a | lirans@il.ibm.com | return bs->dirty_bitmap[chunk];
|
1997 | 7cd1e32a | lirans@il.ibm.com | } else {
|
1998 | 7cd1e32a | lirans@il.ibm.com | return 0; |
1999 | 7cd1e32a | lirans@il.ibm.com | } |
2000 | 7cd1e32a | lirans@il.ibm.com | } |
2001 | 7cd1e32a | lirans@il.ibm.com | |
2002 | 7cd1e32a | lirans@il.ibm.com | void bdrv_reset_dirty(BlockDriverState *bs, int64_t cur_sector,
|
2003 | 7cd1e32a | lirans@il.ibm.com | int nr_sectors)
|
2004 | 7cd1e32a | lirans@il.ibm.com | { |
2005 | 7cd1e32a | lirans@il.ibm.com | set_dirty_bitmap(bs, cur_sector, nr_sectors, 0);
|
2006 | 7cd1e32a | lirans@il.ibm.com | } |
2007 | 7cd1e32a | lirans@il.ibm.com | |
2008 | 7cd1e32a | lirans@il.ibm.com | int bdrv_get_sectors_per_chunk(void) |
2009 | 7cd1e32a | lirans@il.ibm.com | { |
2010 | 7cd1e32a | lirans@il.ibm.com | /* size must be 2^x */
|
2011 | 7cd1e32a | lirans@il.ibm.com | return SECTORS_PER_DIRTY_CHUNK;
|
2012 | 7cd1e32a | lirans@il.ibm.com | } |