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_serial(BlockConf *conf, char **serial)
  19{
  20    DriveInfo *dinfo;
  21
  22    if (!*serial) {
  23        /* try to fall back to value set with legacy -drive serial=... */
  24        dinfo = blk_legacy_dinfo(conf->blk);
  25        if (dinfo) {
  26            *serial = g_strdup(dinfo->serial);
  27        }
  28    }
  29}
  30
  31void blkconf_blocksizes(BlockConf *conf)
  32{
  33    BlockBackend *blk = conf->blk;
  34    BlockSizes blocksizes;
  35    int backend_ret;
  36
  37    backend_ret = blk_probe_blocksizes(blk, &blocksizes);
  38    /* fill in detected values if they are not defined via qemu command line */
  39    if (!conf->physical_block_size) {
  40        if (!backend_ret) {
  41           conf->physical_block_size = blocksizes.phys;
  42        } else {
  43            conf->physical_block_size = BDRV_SECTOR_SIZE;
  44        }
  45    }
  46    if (!conf->logical_block_size) {
  47        if (!backend_ret) {
  48            conf->logical_block_size = blocksizes.log;
  49        } else {
  50            conf->logical_block_size = BDRV_SECTOR_SIZE;
  51        }
  52    }
  53}
  54
  55bool blkconf_apply_backend_options(BlockConf *conf, bool readonly,
  56                                   bool resizable, Error **errp)
  57{
  58    BlockBackend *blk = conf->blk;
  59    BlockdevOnError rerror, werror;
  60    uint64_t perm, shared_perm;
  61    bool wce;
  62    int ret;
  63
  64    perm = BLK_PERM_CONSISTENT_READ;
  65    if (!readonly) {
  66        perm |= BLK_PERM_WRITE;
  67    }
  68
  69    shared_perm = BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE_UNCHANGED |
  70                  BLK_PERM_GRAPH_MOD;
  71    if (resizable) {
  72        shared_perm |= BLK_PERM_RESIZE;
  73    }
  74    if (conf->share_rw) {
  75        shared_perm |= BLK_PERM_WRITE;
  76    }
  77
  78    ret = blk_set_perm(blk, perm, shared_perm, errp);
  79    if (ret < 0) {
  80        return false;
  81    }
  82
  83    switch (conf->wce) {
  84    case ON_OFF_AUTO_ON:    wce = true; break;
  85    case ON_OFF_AUTO_OFF:   wce = false; break;
  86    case ON_OFF_AUTO_AUTO:  wce = blk_enable_write_cache(blk); break;
  87    default:
  88        abort();
  89    }
  90
  91    rerror = conf->rerror;
  92    if (rerror == BLOCKDEV_ON_ERROR_AUTO) {
  93        rerror = blk_get_on_error(blk, true);
  94    }
  95
  96    werror = conf->werror;
  97    if (werror == BLOCKDEV_ON_ERROR_AUTO) {
  98        werror = blk_get_on_error(blk, false);
  99    }
 100
 101    blk_set_enable_write_cache(blk, wce);
 102    blk_set_on_error(blk, rerror, werror);
 103
 104    return true;
 105}
 106
 107bool blkconf_geometry(BlockConf *conf, int *ptrans,
 108                      unsigned cyls_max, unsigned heads_max, unsigned secs_max,
 109                      Error **errp)
 110{
 111    DriveInfo *dinfo;
 112
 113    if (!conf->cyls && !conf->heads && !conf->secs) {
 114        /* try to fall back to value set with legacy -drive cyls=... */
 115        dinfo = blk_legacy_dinfo(conf->blk);
 116        if (dinfo) {
 117            conf->cyls  = dinfo->cyls;
 118            conf->heads = dinfo->heads;
 119            conf->secs  = dinfo->secs;
 120            if (ptrans) {
 121                *ptrans = dinfo->trans;
 122            }
 123        }
 124    }
 125    if (!conf->cyls && !conf->heads && !conf->secs) {
 126        hd_geometry_guess(conf->blk,
 127                          &conf->cyls, &conf->heads, &conf->secs,
 128                          ptrans);
 129    } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
 130        *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
 131    }
 132    if (conf->cyls || conf->heads || conf->secs) {
 133        if (conf->cyls < 1 || conf->cyls > cyls_max) {
 134            error_setg(errp, "cyls must be between 1 and %u", cyls_max);
 135            return false;
 136        }
 137        if (conf->heads < 1 || conf->heads > heads_max) {
 138            error_setg(errp, "heads must be between 1 and %u", heads_max);
 139            return false;
 140        }
 141        if (conf->secs < 1 || conf->secs > secs_max) {
 142            error_setg(errp, "secs must be between 1 and %u", secs_max);
 143            return false;
 144        }
 145    }
 146    return true;
 147}
 148