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1 /* |
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2 * QEMU System Emulator block driver |
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3 * |
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4 * Copyright (c) 2003 Fabrice Bellard |
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5 * |
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6 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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7 * of this software and associated documentation files (the "Software"), to deal |
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8 * in the Software without restriction, including without limitation the rights |
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9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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10 * copies of the Software, and to permit persons to whom the Software is |
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11 * furnished to do so, subject to the following conditions: |
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12 * |
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13 * The above copyright notice and this permission notice shall be included in |
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14 * all copies or substantial portions of the Software. |
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15 * |
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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22 * THE SOFTWARE. |
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23 */ |
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24 #ifndef BLOCK_INT_H |
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25 #define BLOCK_INT_H |
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26 |
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27 #include "block.h" |
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28 |
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29 #define BLOCK_FLAG_ENCRYPT 1 |
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30 #define BLOCK_FLAG_COMPRESS 2 |
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31 #define BLOCK_FLAG_COMPAT6 4 |
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32 |
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33 struct BlockDriver { |
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34 const char *format_name; |
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35 int instance_size; |
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36 int (*bdrv_probe)(const uint8_t *buf, int buf_size, const char *filename); |
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37 int (*bdrv_open)(BlockDriverState *bs, const char *filename, int flags); |
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38 int (*bdrv_read)(BlockDriverState *bs, int64_t sector_num, |
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39 uint8_t *buf, int nb_sectors); |
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40 int (*bdrv_write)(BlockDriverState *bs, int64_t sector_num, |
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41 const uint8_t *buf, int nb_sectors); |
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42 void (*bdrv_close)(BlockDriverState *bs); |
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43 int (*bdrv_create)(const char *filename, int64_t total_sectors, |
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44 const char *backing_file, int flags); |
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45 void (*bdrv_flush)(BlockDriverState *bs); |
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46 int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num, |
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47 int nb_sectors, int *pnum); |
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48 int (*bdrv_set_key)(BlockDriverState *bs, const char *key); |
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49 int (*bdrv_make_empty)(BlockDriverState *bs); |
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50 /* aio */ |
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51 BlockDriverAIOCB *(*bdrv_aio_read)(BlockDriverState *bs, |
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52 int64_t sector_num, uint8_t *buf, int nb_sectors, |
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53 BlockDriverCompletionFunc *cb, void *opaque); |
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54 BlockDriverAIOCB *(*bdrv_aio_write)(BlockDriverState *bs, |
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55 int64_t sector_num, const uint8_t *buf, int nb_sectors, |
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56 BlockDriverCompletionFunc *cb, void *opaque); |
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57 void (*bdrv_aio_cancel)(BlockDriverAIOCB *acb); |
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58 int aiocb_size; |
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59 |
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60 const char *protocol_name; |
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61 int (*bdrv_pread)(BlockDriverState *bs, int64_t offset, |
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62 uint8_t *buf, int count); |
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63 int (*bdrv_pwrite)(BlockDriverState *bs, int64_t offset, |
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64 const uint8_t *buf, int count); |
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65 int (*bdrv_truncate)(BlockDriverState *bs, int64_t offset); |
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66 int64_t (*bdrv_getlength)(BlockDriverState *bs); |
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67 int (*bdrv_write_compressed)(BlockDriverState *bs, int64_t sector_num, |
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68 const uint8_t *buf, int nb_sectors); |
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69 |
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70 int (*bdrv_snapshot_create)(BlockDriverState *bs, |
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71 QEMUSnapshotInfo *sn_info); |
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72 int (*bdrv_snapshot_goto)(BlockDriverState *bs, |
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73 const char *snapshot_id); |
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74 int (*bdrv_snapshot_delete)(BlockDriverState *bs, const char *snapshot_id); |
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75 int (*bdrv_snapshot_list)(BlockDriverState *bs, |
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76 QEMUSnapshotInfo **psn_info); |
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77 int (*bdrv_get_info)(BlockDriverState *bs, BlockDriverInfo *bdi); |
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78 |
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79 /* removable device specific */ |
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80 int (*bdrv_is_inserted)(BlockDriverState *bs); |
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81 int (*bdrv_media_changed)(BlockDriverState *bs); |
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82 int (*bdrv_eject)(BlockDriverState *bs, int eject_flag); |
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83 int (*bdrv_set_locked)(BlockDriverState *bs, int locked); |
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84 |
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85 /* to control generic scsi devices */ |
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86 int (*bdrv_ioctl)(BlockDriverState *bs, unsigned long int req, void *buf); |
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87 |
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88 BlockDriverAIOCB *free_aiocb; |
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89 struct BlockDriver *next; |
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90 }; |
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91 |
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92 struct BlockDriverState { |
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93 int64_t total_sectors; /* if we are reading a disk image, give its |
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94 size in sectors */ |
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95 int read_only; /* if true, the media is read only */ |
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96 int removable; /* if true, the media can be removed */ |
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97 int locked; /* if true, the media cannot temporarily be ejected */ |
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98 int encrypted; /* if true, the media is encrypted */ |
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99 int sg; /* if true, the device is a /dev/sg* */ |
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100 /* event callback when inserting/removing */ |
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101 void (*change_cb)(void *opaque); |
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102 void *change_opaque; |
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103 |
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104 BlockDriver *drv; /* NULL means no media */ |
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105 void *opaque; |
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106 |
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107 char filename[1024]; |
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108 char backing_file[1024]; /* if non zero, the image is a diff of |
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109 this file image */ |
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110 int is_temporary; |
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111 int media_changed; |
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112 |
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113 BlockDriverState *backing_hd; |
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114 /* async read/write emulation */ |
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115 |
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116 void *sync_aiocb; |
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117 |
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118 /* I/O stats (display with "info blockstats"). */ |
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119 uint64_t rd_bytes; |
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120 uint64_t wr_bytes; |
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121 uint64_t rd_ops; |
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122 uint64_t wr_ops; |
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123 |
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124 /* NOTE: the following infos are only hints for real hardware |
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125 drivers. They are not used by the block driver */ |
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126 int cyls, heads, secs, translation; |
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127 int type; |
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128 char device_name[32]; |
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129 BlockDriverState *next; |
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130 }; |
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131 |
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132 struct BlockDriverAIOCB { |
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133 BlockDriverState *bs; |
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134 BlockDriverCompletionFunc *cb; |
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135 void *opaque; |
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136 BlockDriverAIOCB *next; |
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137 }; |
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138 |
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139 void get_tmp_filename(char *filename, int size); |
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140 |
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141 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb, |
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142 void *opaque); |
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143 void qemu_aio_release(void *p); |
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144 |
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145 extern BlockDriverState *bdrv_first; |
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146 |
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147 #endif /* BLOCK_INT_H */ |