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 "qapi/qapi-types-block.h"
  16#include "qemu/error-report.h"
  17
  18void blkconf_blocksizes(BlockConf *conf)
  19{
  20    BlockBackend *blk = conf->blk;
  21    BlockSizes blocksizes;
  22    int backend_ret;
  23
  24    backend_ret = blk_probe_blocksizes(blk, &blocksizes);
  25    /* fill in detected values if they are not defined via qemu command line */
  26    if (!conf->physical_block_size) {
  27        if (!backend_ret) {
  28           conf->physical_block_size = blocksizes.phys;
  29        } else {
  30            conf->physical_block_size = BDRV_SECTOR_SIZE;
  31        }
  32    }
  33    if (!conf->logical_block_size) {
  34        if (!backend_ret) {
  35            conf->logical_block_size = blocksizes.log;
  36        } else {
  37            conf->logical_block_size = BDRV_SECTOR_SIZE;
  38        }
  39    }
  40}
  41
  42bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  43                                   bool resizable, Error **errp)
  44{
  45    BlockBackend *blk = conf->blk;
  46    BlockdevOnError rerror, werror;
  47    uint64_t perm, shared_perm;
  48    bool wce;
  49    int ret;
  50
  51    perm = BLK_PERM_CONSISTENT_READ;
  52    if (!readonly) {
  53        perm |= BLK_PERM_WRITE;
  54    }
  55
  56    shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
  57                  BLK_PERM_GRAPH_MOD;
  58    if (resizable) {
  59        shared_perm |= BLK_PERM_RESIZE;
  60    }
  61    if (conf->share_rw) {
  62        shared_perm |= BLK_PERM_WRITE;
  63    }
  64
  65    ret = blk_set_perm(blk, perm, shared_perm, errp);
  66    if (ret < 0) {
  67        return false;
  68    }
  69
  70    switch (conf->wce) {
  71    case ON_OFF_AUTO_ON:    wce = true; break;
  72    case ON_OFF_AUTO_OFF:   wce = false; break;
  73    case ON_OFF_AUTO_AUTO:  wce = blk_enable_write_cache(blk); break;
  74    default:
  75        abort();
  76    }
  77
  78    rerror = conf->rerror;
  79    if (rerror == BLOCKDEV_ON_ERROR_AUTO) {
  80        rerror = blk_get_on_error(blk, true);
  81    }
  82
  83    werror = conf->werror;
  84    if (werror == BLOCKDEV_ON_ERROR_AUTO) {
  85        werror = blk_get_on_error(blk, false);
  86    }
  87
  88    blk_set_enable_write_cache(blk, wce);
  89    blk_set_on_error(blk, rerror, werror);
  90
  91    return true;
  92}
  93
  94bool blkconf_geometry(BlockConf *conf, int *ptrans,
  95                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  96                      Error **errp)
  97{
  98    if (!conf->cyls && !conf->heads && !conf->secs) {
  99        hd_geometry_guess(conf->blk,
 100                          &conf->cyls, &conf->heads, &conf->secs,
 101                          ptrans);
 102    } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
 103        *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
 104    }
 105    if (conf->cyls || conf->heads || conf->secs) {
 106        if (conf->cyls < 1 || conf->cyls > cyls_max) {
 107            error_setg(errp, "cyls must be between 1 and %u", cyls_max);
 108            return false;
 109        }
 110        if (conf->heads < 1 || conf->heads > heads_max) {
 111            error_setg(errp, "heads must be between 1 and %u", heads_max);
 112            return false;
 113        }
 114        if (conf->secs < 1 || conf->secs > secs_max) {
 115            error_setg(errp, "secs must be between 1 and %u", secs_max);
 116            return false;
 117        }
 118    }
 119    return true;
 120}
 121