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1 | ea2384d3 | bellard | /*
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2 | ea2384d3 | bellard | * QEMU System Emulator block driver
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3 | 5fafdf24 | ths | *
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4 | ea2384d3 | bellard | * Copyright (c) 2003 Fabrice Bellard
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5 | 5fafdf24 | ths | *
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6 | ea2384d3 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | ea2384d3 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | ea2384d3 | bellard | * in the Software without restriction, including without limitation the rights
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9 | ea2384d3 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | ea2384d3 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | ea2384d3 | bellard | * furnished to do so, subject to the following conditions:
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12 | ea2384d3 | bellard | *
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13 | ea2384d3 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | ea2384d3 | bellard | * all copies or substantial portions of the Software.
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15 | ea2384d3 | bellard | *
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16 | ea2384d3 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | ea2384d3 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | ea2384d3 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | ea2384d3 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | ea2384d3 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | ea2384d3 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | ea2384d3 | bellard | * THE SOFTWARE.
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23 | ea2384d3 | bellard | */
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24 | ea2384d3 | bellard | #ifndef BLOCK_INT_H
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25 | ea2384d3 | bellard | #define BLOCK_INT_H
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26 | ea2384d3 | bellard | |
27 | faf07963 | pbrook | #include "block.h" |
28 | 0e7e1989 | Kevin Wolf | #include "qemu-option.h" |
29 | 1b7bdbc1 | Stefan Hajnoczi | #include "qemu-queue.h" |
30 | faf07963 | pbrook | |
31 | ec36ba14 | ths | #define BLOCK_FLAG_ENCRYPT 1 |
32 | ec36ba14 | ths | #define BLOCK_FLAG_COMPAT6 4 |
33 | ec36ba14 | ths | |
34 | 0e7e1989 | Kevin Wolf | #define BLOCK_OPT_SIZE "size" |
35 | 0e7e1989 | Kevin Wolf | #define BLOCK_OPT_ENCRYPT "encryption" |
36 | 0e7e1989 | Kevin Wolf | #define BLOCK_OPT_COMPAT6 "compat6" |
37 | 0e7e1989 | Kevin Wolf | #define BLOCK_OPT_BACKING_FILE "backing_file" |
38 | 0e7e1989 | Kevin Wolf | #define BLOCK_OPT_BACKING_FMT "backing_fmt" |
39 | 73c632ed | Kevin Wolf | #define BLOCK_OPT_CLUSTER_SIZE "cluster_size" |
40 | 75411d23 | Stefan Hajnoczi | #define BLOCK_OPT_TABLE_SIZE "table_size" |
41 | a35e1c17 | Kevin Wolf | #define BLOCK_OPT_PREALLOC "preallocation" |
42 | 0e7e1989 | Kevin Wolf | |
43 | 6bbff9a0 | aliguori | typedef struct AIOPool { |
44 | 6bbff9a0 | aliguori | void (*cancel)(BlockDriverAIOCB *acb);
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45 | 6bbff9a0 | aliguori | int aiocb_size;
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46 | 6bbff9a0 | aliguori | BlockDriverAIOCB *free_aiocb; |
47 | 6bbff9a0 | aliguori | } AIOPool; |
48 | 6bbff9a0 | aliguori | |
49 | ea2384d3 | bellard | struct BlockDriver {
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50 | ea2384d3 | bellard | const char *format_name; |
51 | ea2384d3 | bellard | int instance_size;
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52 | ea2384d3 | bellard | int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); |
53 | 508c7cb3 | Christoph Hellwig | int (*bdrv_probe_device)(const char *filename); |
54 | 66f82cee | Kevin Wolf | int (*bdrv_open)(BlockDriverState *bs, int flags); |
55 | 66f82cee | Kevin Wolf | int (*bdrv_file_open)(BlockDriverState *bs, const char *filename, int flags); |
56 | 5fafdf24 | ths | int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num,
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57 | ea2384d3 | bellard | uint8_t *buf, int nb_sectors);
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58 | 5fafdf24 | ths | int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num,
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59 | ea2384d3 | bellard | const uint8_t *buf, int nb_sectors); |
60 | e2731add | bellard | void (*bdrv_close)(BlockDriverState *bs);
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61 | 0e7e1989 | Kevin Wolf | int (*bdrv_create)(const char *filename, QEMUOptionParameter *options); |
62 | 205ef796 | Kevin Wolf | int (*bdrv_flush)(BlockDriverState *bs);
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63 | ea2384d3 | bellard | int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,
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64 | ea2384d3 | bellard | int nb_sectors, int *pnum); |
65 | ea2384d3 | bellard | int (*bdrv_set_key)(BlockDriverState *bs, const char *key); |
66 | 95389c86 | bellard | int (*bdrv_make_empty)(BlockDriverState *bs);
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67 | 83f64091 | bellard | /* aio */
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68 | f141eafe | aliguori | BlockDriverAIOCB *(*bdrv_aio_readv)(BlockDriverState *bs, |
69 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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70 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque);
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71 | f141eafe | aliguori | BlockDriverAIOCB *(*bdrv_aio_writev)(BlockDriverState *bs, |
72 | f141eafe | aliguori | int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
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73 | ce1a14dc | pbrook | BlockDriverCompletionFunc *cb, void *opaque);
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74 | b2e12bc6 | Christoph Hellwig | BlockDriverAIOCB *(*bdrv_aio_flush)(BlockDriverState *bs, |
75 | b2e12bc6 | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque);
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76 | bb8bf76f | Christoph Hellwig | int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
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77 | bb8bf76f | Christoph Hellwig | int nb_sectors);
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78 | 83f64091 | bellard | |
79 | 40b4f539 | Kevin Wolf | int (*bdrv_aio_multiwrite)(BlockDriverState *bs, BlockRequest *reqs,
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80 | 40b4f539 | Kevin Wolf | int num_reqs);
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81 | 40b4f539 | Kevin Wolf | int (*bdrv_merge_requests)(BlockDriverState *bs, BlockRequest* a,
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82 | 40b4f539 | Kevin Wolf | BlockRequest *b); |
83 | 40b4f539 | Kevin Wolf | |
84 | 40b4f539 | Kevin Wolf | |
85 | 83f64091 | bellard | const char *protocol_name; |
86 | 83f64091 | bellard | int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset);
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87 | 83f64091 | bellard | int64_t (*bdrv_getlength)(BlockDriverState *bs); |
88 | 5fafdf24 | ths | int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num,
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89 | faea38e7 | bellard | const uint8_t *buf, int nb_sectors); |
90 | faea38e7 | bellard | |
91 | 5fafdf24 | ths | int (*bdrv_snapshot_create)(BlockDriverState *bs,
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92 | faea38e7 | bellard | QEMUSnapshotInfo *sn_info); |
93 | 5fafdf24 | ths | int (*bdrv_snapshot_goto)(BlockDriverState *bs,
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94 | faea38e7 | bellard | const char *snapshot_id); |
95 | faea38e7 | bellard | int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id); |
96 | 5fafdf24 | ths | int (*bdrv_snapshot_list)(BlockDriverState *bs,
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97 | faea38e7 | bellard | QEMUSnapshotInfo **psn_info); |
98 | 51ef6727 | edison | int (*bdrv_snapshot_load_tmp)(BlockDriverState *bs,
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99 | 51ef6727 | edison | const char *snapshot_name); |
100 | faea38e7 | bellard | int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi);
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101 | 83f64091 | bellard | |
102 | 45566e9c | Christoph Hellwig | int (*bdrv_save_vmstate)(BlockDriverState *bs, const uint8_t *buf, |
103 | 45566e9c | Christoph Hellwig | int64_t pos, int size);
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104 | 45566e9c | Christoph Hellwig | int (*bdrv_load_vmstate)(BlockDriverState *bs, uint8_t *buf,
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105 | 45566e9c | Christoph Hellwig | int64_t pos, int size);
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106 | 178e08a5 | aliguori | |
107 | 756e6736 | Kevin Wolf | int (*bdrv_change_backing_file)(BlockDriverState *bs,
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108 | 756e6736 | Kevin Wolf | const char *backing_file, const char *backing_fmt); |
109 | 756e6736 | Kevin Wolf | |
110 | 19cb3738 | bellard | /* removable device specific */
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111 | 19cb3738 | bellard | int (*bdrv_is_inserted)(BlockDriverState *bs);
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112 | 19cb3738 | bellard | int (*bdrv_media_changed)(BlockDriverState *bs);
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113 | 19cb3738 | bellard | int (*bdrv_eject)(BlockDriverState *bs, int eject_flag); |
114 | 19cb3738 | bellard | int (*bdrv_set_locked)(BlockDriverState *bs, int locked); |
115 | 3b46e624 | ths | |
116 | 985a03b0 | ths | /* to control generic scsi devices */
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117 | 985a03b0 | ths | int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); |
118 | 221f715d | aliguori | BlockDriverAIOCB *(*bdrv_aio_ioctl)(BlockDriverState *bs, |
119 | 221f715d | aliguori | unsigned long int req, void *buf, |
120 | 221f715d | aliguori | BlockDriverCompletionFunc *cb, void *opaque);
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121 | 985a03b0 | ths | |
122 | 0e7e1989 | Kevin Wolf | /* List of options for creating images, terminated by name == NULL */
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123 | 0e7e1989 | Kevin Wolf | QEMUOptionParameter *create_options; |
124 | 0e7e1989 | Kevin Wolf | |
125 | 5eb45639 | aliguori | |
126 | 9ac228e0 | Kevin Wolf | /*
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127 | 9ac228e0 | Kevin Wolf | * Returns 0 for completed check, -errno for internal errors.
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128 | 9ac228e0 | Kevin Wolf | * The check results are stored in result.
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129 | 9ac228e0 | Kevin Wolf | */
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130 | 9ac228e0 | Kevin Wolf | int (*bdrv_check)(BlockDriverState* bs, BdrvCheckResult *result);
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131 | e97fc193 | aliguori | |
132 | 8b9b0cc2 | Kevin Wolf | void (*bdrv_debug_event)(BlockDriverState *bs, BlkDebugEvent event);
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133 | 8b9b0cc2 | Kevin Wolf | |
134 | 336c1c12 | Kevin Wolf | /*
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135 | 336c1c12 | Kevin Wolf | * Returns 1 if newly created images are guaranteed to contain only
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136 | 336c1c12 | Kevin Wolf | * zeros, 0 otherwise.
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137 | 336c1c12 | Kevin Wolf | */
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138 | 336c1c12 | Kevin Wolf | int (*bdrv_has_zero_init)(BlockDriverState *bs);
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139 | 12c09b8c | Kevin Wolf | |
140 | 8a22f02a | Stefan Hajnoczi | QLIST_ENTRY(BlockDriver) list; |
141 | ea2384d3 | bellard | }; |
142 | ea2384d3 | bellard | |
143 | ea2384d3 | bellard | struct BlockDriverState {
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144 | d15a771d | bellard | int64_t total_sectors; /* if we are reading a disk image, give its
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145 | d15a771d | bellard | size in sectors */
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146 | ea2384d3 | bellard | int read_only; /* if true, the media is read only */ |
147 | 4dca4b63 | Naphtali Sprei | int keep_read_only; /* if true, the media was requested to stay read only */ |
148 | 4dca4b63 | Naphtali Sprei | int open_flags; /* flags used to open the file, re-used for re-open */ |
149 | ea2384d3 | bellard | int removable; /* if true, the media can be removed */ |
150 | ea2384d3 | bellard | int locked; /* if true, the media cannot temporarily be ejected */ |
151 | 4be9762a | Markus Armbruster | int tray_open; /* if true, the virtual tray is open */ |
152 | ea2384d3 | bellard | int encrypted; /* if true, the media is encrypted */ |
153 | c0f4ce77 | aliguori | int valid_key; /* if true, a valid encryption key has been set */ |
154 | 985a03b0 | ths | int sg; /* if true, the device is a /dev/sg* */ |
155 | ea2384d3 | bellard | /* event callback when inserting/removing */
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156 | db97ee6a | Christoph Hellwig | void (*change_cb)(void *opaque, int reason); |
157 | ea2384d3 | bellard | void *change_opaque;
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158 | ea2384d3 | bellard | |
159 | 19cb3738 | bellard | BlockDriver *drv; /* NULL means no media */
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160 | ea2384d3 | bellard | void *opaque;
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161 | ea2384d3 | bellard | |
162 | 18846dee | Markus Armbruster | DeviceState *peer; |
163 | 18846dee | Markus Armbruster | |
164 | ea2384d3 | bellard | char filename[1024]; |
165 | ea2384d3 | bellard | char backing_file[1024]; /* if non zero, the image is a diff of |
166 | ea2384d3 | bellard | this file image */
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167 | 5eb45639 | aliguori | char backing_format[16]; /* if non-zero and backing_file exists */ |
168 | ea2384d3 | bellard | int is_temporary;
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169 | 19cb3738 | bellard | int media_changed;
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170 | 19cb3738 | bellard | |
171 | ea2384d3 | bellard | BlockDriverState *backing_hd; |
172 | 66f82cee | Kevin Wolf | BlockDriverState *file; |
173 | 66f82cee | Kevin Wolf | |
174 | ce1a14dc | pbrook | /* async read/write emulation */
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175 | 83f64091 | bellard | |
176 | ce1a14dc | pbrook | void *sync_aiocb;
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177 | 3b46e624 | ths | |
178 | a36e69dd | ths | /* I/O stats (display with "info blockstats"). */
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179 | a36e69dd | ths | uint64_t rd_bytes; |
180 | a36e69dd | ths | uint64_t wr_bytes; |
181 | a36e69dd | ths | uint64_t rd_ops; |
182 | a36e69dd | ths | uint64_t wr_ops; |
183 | 294cc35f | Kevin Wolf | uint64_t wr_highest_sector; |
184 | a36e69dd | ths | |
185 | 71d0770c | aliguori | /* Whether the disk can expand beyond total_sectors */
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186 | 71d0770c | aliguori | int growable;
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187 | 71d0770c | aliguori | |
188 | e268ca52 | aliguori | /* the memory alignment required for the buffers handled by this driver */
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189 | e268ca52 | aliguori | int buffer_alignment;
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190 | e268ca52 | aliguori | |
191 | e900a7b7 | Christoph Hellwig | /* do we need to tell the quest if we have a volatile write cache? */
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192 | e900a7b7 | Christoph Hellwig | int enable_write_cache;
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193 | e900a7b7 | Christoph Hellwig | |
194 | ea2384d3 | bellard | /* NOTE: the following infos are only hints for real hardware
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195 | ea2384d3 | bellard | drivers. They are not used by the block driver */
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196 | 46d4767d | bellard | int cyls, heads, secs, translation;
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197 | abd7f68d | Markus Armbruster | BlockErrorAction on_read_error, on_write_error; |
198 | ea2384d3 | bellard | char device_name[32]; |
199 | c6d22830 | Jan Kiszka | unsigned long *dirty_bitmap; |
200 | aaa0eb75 | Liran Schour | int64_t dirty_count; |
201 | db593f25 | Marcelo Tosatti | int in_use; /* users other than guest access, eg. block migration */ |
202 | 1b7bdbc1 | Stefan Hajnoczi | QTAILQ_ENTRY(BlockDriverState) list; |
203 | b0a7b120 | aliguori | void *private;
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204 | ea2384d3 | bellard | }; |
205 | ea2384d3 | bellard | |
206 | db97ee6a | Christoph Hellwig | #define CHANGE_MEDIA 0x01 |
207 | db97ee6a | Christoph Hellwig | #define CHANGE_SIZE 0x02 |
208 | db97ee6a | Christoph Hellwig | |
209 | 83f64091 | bellard | struct BlockDriverAIOCB {
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210 | 6bbff9a0 | aliguori | AIOPool *pool; |
211 | 83f64091 | bellard | BlockDriverState *bs; |
212 | 83f64091 | bellard | BlockDriverCompletionFunc *cb; |
213 | ce1a14dc | pbrook | void *opaque;
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214 | ce1a14dc | pbrook | BlockDriverAIOCB *next; |
215 | 83f64091 | bellard | }; |
216 | 83f64091 | bellard | |
217 | 95389c86 | bellard | void get_tmp_filename(char *filename, int size); |
218 | 95389c86 | bellard | |
219 | c16b5a2c | Christoph Hellwig | void *qemu_aio_get(AIOPool *pool, BlockDriverState *bs,
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220 | c16b5a2c | Christoph Hellwig | BlockDriverCompletionFunc *cb, void *opaque);
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221 | ce1a14dc | pbrook | void qemu_aio_release(void *p); |
222 | ce1a14dc | pbrook | |
223 | e268ca52 | aliguori | void *qemu_blockalign(BlockDriverState *bs, size_t size);
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224 | e268ca52 | aliguori | |
225 | 508c7cb3 | Christoph Hellwig | #ifdef _WIN32
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226 | 508c7cb3 | Christoph Hellwig | int is_windows_drive(const char *filename); |
227 | 508c7cb3 | Christoph Hellwig | #endif
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228 | 508c7cb3 | Christoph Hellwig | |
229 | 428c149b | Christoph Hellwig | typedef struct BlockConf { |
230 | f8b6cc00 | Markus Armbruster | BlockDriverState *bs; |
231 | 428c149b | Christoph Hellwig | uint16_t physical_block_size; |
232 | 8cfacf07 | Christoph Hellwig | uint16_t logical_block_size; |
233 | 428c149b | Christoph Hellwig | uint16_t min_io_size; |
234 | 428c149b | Christoph Hellwig | uint32_t opt_io_size; |
235 | 1ca4d09a | Gleb Natapov | int32_t bootindex; |
236 | bb8bf76f | Christoph Hellwig | uint32_t discard_granularity; |
237 | 428c149b | Christoph Hellwig | } BlockConf; |
238 | 428c149b | Christoph Hellwig | |
239 | 428c149b | Christoph Hellwig | static inline unsigned int get_physical_block_exp(BlockConf *conf) |
240 | 428c149b | Christoph Hellwig | { |
241 | 428c149b | Christoph Hellwig | unsigned int exp = 0, size; |
242 | 428c149b | Christoph Hellwig | |
243 | 1e297c32 | Christoph Hellwig | for (size = conf->physical_block_size;
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244 | 1e297c32 | Christoph Hellwig | size > conf->logical_block_size; |
245 | 1e297c32 | Christoph Hellwig | size >>= 1) {
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246 | 428c149b | Christoph Hellwig | exp++; |
247 | 428c149b | Christoph Hellwig | } |
248 | 428c149b | Christoph Hellwig | |
249 | 428c149b | Christoph Hellwig | return exp;
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250 | 428c149b | Christoph Hellwig | } |
251 | 428c149b | Christoph Hellwig | |
252 | 428c149b | Christoph Hellwig | #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
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253 | f8b6cc00 | Markus Armbruster | DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
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254 | 8cfacf07 | Christoph Hellwig | DEFINE_PROP_UINT16("logical_block_size", _state, \
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255 | 8cfacf07 | Christoph Hellwig | _conf.logical_block_size, 512), \
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256 | 428c149b | Christoph Hellwig | DEFINE_PROP_UINT16("physical_block_size", _state, \
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257 | 428c149b | Christoph Hellwig | _conf.physical_block_size, 512), \
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258 | 55459498 | Christoph Hellwig | DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \ |
259 | 1ca4d09a | Gleb Natapov | DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \ |
260 | bb8bf76f | Christoph Hellwig | DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \ |
261 | bb8bf76f | Christoph Hellwig | DEFINE_PROP_UINT32("discard_granularity", _state, \
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262 | bb8bf76f | Christoph Hellwig | _conf.discard_granularity, 0)
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263 | 428c149b | Christoph Hellwig | |
264 | ea2384d3 | bellard | #endif /* BLOCK_INT_H */ |