block/export: Add query-block-exports
[qemu.git] / include / hw / block / block.h
1 /*
2 * Common code for block device models
3 *
4 * Copyright (C) 2012 Red Hat, Inc.
5 * Copyright (c) 2003-2008 Fabrice Bellard
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or
8 * later. See the COPYING file in the top-level directory.
9 */
10
11 #ifndef HW_BLOCK_H
12 #define HW_BLOCK_H
13
14 #include "exec/hwaddr.h"
15 #include "qapi/qapi-types-block-core.h"
16
17 /* Configuration */
18
19 typedef struct BlockConf {
20 BlockBackend *blk;
21 uint32_t physical_block_size;
22 uint32_t logical_block_size;
23 uint32_t min_io_size;
24 uint32_t opt_io_size;
25 int32_t bootindex;
26 uint32_t discard_granularity;
27 /* geometry, not all devices use this */
28 uint32_t cyls, heads, secs;
29 uint32_t lcyls, lheads, lsecs;
30 OnOffAuto wce;
31 bool share_rw;
32 BlockdevOnError rerror;
33 BlockdevOnError werror;
34 } BlockConf;
35
36 static inline unsigned int get_physical_block_exp(BlockConf *conf)
37 {
38 unsigned int exp = 0, size;
39
40 for (size = conf->physical_block_size;
41 size > conf->logical_block_size;
42 size >>= 1) {
43 exp++;
44 }
45
46 return exp;
47 }
48
49 #define DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf) \
50 DEFINE_PROP_BLOCKSIZE("logical_block_size", _state, \
51 _conf.logical_block_size), \
52 DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \
53 _conf.physical_block_size), \
54 DEFINE_PROP_SIZE32("min_io_size", _state, _conf.min_io_size, 0), \
55 DEFINE_PROP_SIZE32("opt_io_size", _state, _conf.opt_io_size, 0), \
56 DEFINE_PROP_SIZE32("discard_granularity", _state, \
57 _conf.discard_granularity, -1), \
58 DEFINE_PROP_ON_OFF_AUTO("write-cache", _state, _conf.wce, \
59 ON_OFF_AUTO_AUTO), \
60 DEFINE_PROP_BOOL("share-rw", _state, _conf.share_rw, false)
61
62 #define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
63 DEFINE_PROP_DRIVE("drive", _state, _conf.blk), \
64 DEFINE_BLOCK_PROPERTIES_BASE(_state, _conf)
65
66 #define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf) \
67 DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0), \
68 DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
69 DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0), \
70 DEFINE_PROP_UINT32("lcyls", _state, _conf.lcyls, 0), \
71 DEFINE_PROP_UINT32("lheads", _state, _conf.lheads, 0), \
72 DEFINE_PROP_UINT32("lsecs", _state, _conf.lsecs, 0)
73
74 #define DEFINE_BLOCK_ERROR_PROPERTIES(_state, _conf) \
75 DEFINE_PROP_BLOCKDEV_ON_ERROR("rerror", _state, _conf.rerror, \
76 BLOCKDEV_ON_ERROR_AUTO), \
77 DEFINE_PROP_BLOCKDEV_ON_ERROR("werror", _state, _conf.werror, \
78 BLOCKDEV_ON_ERROR_AUTO)
79
80 /* Backend access helpers */
81
82 bool blk_check_size_and_read_all(BlockBackend *blk, void *buf, hwaddr size,
83 Error **errp);
84
85 /* Configuration helpers */
86
87 bool blkconf_geometry(BlockConf *conf, int *trans,
88 unsigned cyls_max, unsigned heads_max, unsigned secs_max,
89 Error **errp);
90 bool blkconf_blocksizes(BlockConf *conf, Error **errp);
91 bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
92 bool resizable, Error **errp);
93
94 /* Hard disk geometry */
95
96 void hd_geometry_guess(BlockBackend *blk,
97 uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
98 int *ptrans);
99 int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
100
101 #endif