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215e47b9ea
Because discard is now a host parameter, we can always fake it as enabled in the guest. This is an extension of the current choice to ignore "not supported" errors from the host when discard_granularity is set to nonzero. The default granularity is set to the logical block size or 4k, whichever is largest, because cluster sizes below 4k are rarely used and 4K is a typical block size for files. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
79 lines
2.5 KiB
C
79 lines
2.5 KiB
C
/*
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* Common code for block device models
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*
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* Copyright (C) 2012 Red Hat, Inc.
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* later. See the COPYING file in the top-level directory.
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*/
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#ifndef HW_BLOCK_COMMON_H
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#define HW_BLOCK_COMMON_H
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#include "qemu-common.h"
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/* Configuration */
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typedef struct BlockConf {
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BlockDriverState *bs;
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uint16_t physical_block_size;
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uint16_t logical_block_size;
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uint16_t min_io_size;
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uint32_t opt_io_size;
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int32_t bootindex;
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uint32_t discard_granularity;
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/* geometry, not all devices use this */
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uint32_t cyls, heads, secs;
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} BlockConf;
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static inline unsigned int get_physical_block_exp(BlockConf *conf)
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{
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unsigned int exp = 0, size;
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for (size = conf->physical_block_size;
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size > conf->logical_block_size;
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size >>= 1) {
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exp++;
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}
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return exp;
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}
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#define DEFINE_BLOCK_PROPERTIES(_state, _conf) \
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DEFINE_PROP_DRIVE("drive", _state, _conf.bs), \
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DEFINE_PROP_BLOCKSIZE("logical_block_size", _state, \
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_conf.logical_block_size, 512), \
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DEFINE_PROP_BLOCKSIZE("physical_block_size", _state, \
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_conf.physical_block_size, 512), \
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DEFINE_PROP_UINT16("min_io_size", _state, _conf.min_io_size, 0), \
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DEFINE_PROP_UINT32("opt_io_size", _state, _conf.opt_io_size, 0), \
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DEFINE_PROP_INT32("bootindex", _state, _conf.bootindex, -1), \
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DEFINE_PROP_UINT32("discard_granularity", _state, \
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_conf.discard_granularity, -1)
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#define DEFINE_BLOCK_CHS_PROPERTIES(_state, _conf) \
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DEFINE_PROP_UINT32("cyls", _state, _conf.cyls, 0), \
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DEFINE_PROP_UINT32("heads", _state, _conf.heads, 0), \
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DEFINE_PROP_UINT32("secs", _state, _conf.secs, 0)
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/* Configuration helpers */
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void blkconf_serial(BlockConf *conf, char **serial);
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int blkconf_geometry(BlockConf *conf, int *trans,
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unsigned cyls_max, unsigned heads_max, unsigned secs_max);
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/* Hard disk geometry */
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#define BIOS_ATA_TRANSLATION_AUTO 0
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#define BIOS_ATA_TRANSLATION_NONE 1
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#define BIOS_ATA_TRANSLATION_LBA 2
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#define BIOS_ATA_TRANSLATION_LARGE 3
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#define BIOS_ATA_TRANSLATION_RECHS 4
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void hd_geometry_guess(BlockDriverState *bs,
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uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
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int *ptrans);
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int hd_bios_chs_auto_trans(uint32_t cyls, uint32_t heads, uint32_t secs);
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#endif
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