LXR qemu/hw/block/block.c

   1/*
   2 * Common code for block device models
   3 *
   4 * Copyright (C) 2012 Red Hat, Inc.
   5 *
   6 * This work is licensed under the terms of the GNU GPL, version 2 or
   7 * later.  See the COPYING file in the top-level directory.
   8 */
   9
  10#include "qemu/osdep.h"
  11#include "sysemu/blockdev.h"
  12#include "sysemu/block-backend.h"
  13#include "hw/block/block.h"
  14#include "qapi/error.h"
  15#include "qemu/error-report.h"
  16
  17void blkconf_serial(BlockConf *conf, char **serial)
  18{
  19    DriveInfo *dinfo;
  20
  21    if (!*serial) {
  22        /* try to fall back to value set with legacy -drive serial=... */
  23        dinfo = blk_legacy_dinfo(conf->blk);
  24        if (dinfo) {
  25            *serial = g_strdup(dinfo->serial);
  26        }
  27    }
  28}
  29
  30void blkconf_blocksizes(BlockConf *conf)
  31{
  32    BlockBackend *blk = conf->blk;
  33    BlockSizes blocksizes;
  34    int backend_ret;
  35
  36    backend_ret = blk_probe_blocksizes(blk, &blocksizes);
  37    /* fill in detected values if they are not defined via qemu command line */
  38    if (!conf->physical_block_size) {
  39        if (!backend_ret) {
  40           conf->physical_block_size = blocksizes.phys;
  41        } else {
  42            conf->physical_block_size = BDRV_SECTOR_SIZE;
  43        }
  44    }
  45    if (!conf->logical_block_size) {
  46        if (!backend_ret) {
  47            conf->logical_block_size = blocksizes.log;
  48        } else {
  49            conf->logical_block_size = BDRV_SECTOR_SIZE;
  50        }
  51    }
  52}
  53
  54void blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  55                                   bool resizable, Error **errp)
  56{
  57    BlockBackend *blk = conf->blk;
  58    BlockdevOnError rerror, werror;
  59    uint64_t perm, shared_perm;
  60    bool wce;
  61    int ret;
  62
  63    perm = BLK_PERM_CONSISTENT_READ;
  64    if (!readonly) {
  65        perm |= BLK_PERM_WRITE;
  66    }
  67
  68    shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
  69                  BLK_PERM_GRAPH_MOD;
  70    if (resizable) {
  71        shared_perm |= BLK_PERM_RESIZE;
  72    }
  73    if (conf->share_rw) {
  74        shared_perm |= BLK_PERM_WRITE;
  75    }
  76
  77    ret = blk_set_perm(blk, perm, shared_perm, errp);
  78    if (ret < 0) {
  79        return;
  80    }
  81
  82    switch (conf->wce) {
  83    case ON_OFF_AUTO_ON:    wce = true; break;
  84    case ON_OFF_AUTO_OFF:   wce = false; break;
  85    case ON_OFF_AUTO_AUTO:  wce = blk_enable_write_cache(blk); break;
  86    default:
  87        abort();
  88    }
  89
  90    rerror = conf->rerror;
  91    if (rerror == BLOCKDEV_ON_ERROR_AUTO) {
  92        rerror = blk_get_on_error(blk, true);
  93    }
  94
  95    werror = conf->werror;
  96    if (werror == BLOCKDEV_ON_ERROR_AUTO) {
  97        werror = blk_get_on_error(blk, false);
  98    }
  99
 100    blk_set_enable_write_cache(blk, wce);
 101    blk_set_on_error(blk, rerror, werror);
 102}
 103
 104void blkconf_geometry(BlockConf *conf, int *ptrans,
 105                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
 106                      Error **errp)
 107{
 108    DriveInfo *dinfo;
 109
 110    if (!conf->cyls && !conf->heads && !conf->secs) {
 111        /* try to fall back to value set with legacy -drive cyls=... */
 112        dinfo = blk_legacy_dinfo(conf->blk);
 113        if (dinfo) {
 114            conf->cyls  = dinfo->cyls;
 115            conf->heads = dinfo->heads;
 116            conf->secs  = dinfo->secs;
 117            if (ptrans) {
 118                *ptrans = dinfo->trans;
 119            }
 120        }
 121    }
 122    if (!conf->cyls && !conf->heads && !conf->secs) {
 123        hd_geometry_guess(conf->blk,
 124                          &conf->cyls, &conf->heads, &conf->secs,
 125                          ptrans);
 126    } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
 127        *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
 128    }
 129    if (conf->cyls || conf->heads || conf->secs) {
 130        if (conf->cyls < 1 || conf->cyls > cyls_max) {
 131            error_setg(errp, "cyls must be between 1 and %u", cyls_max);
 132            return;
 133        }
 134        if (conf->heads < 1 || conf->heads > heads_max) {
 135            error_setg(errp, "heads must be between 1 and %u", heads_max);
 136            return;
 137        }
 138        if (conf->secs < 1 || conf->secs > secs_max) {
 139            error_setg(errp, "secs must be between 1 and %u", secs_max);
 140            return;
 141        }
 142    }
 143}
 144