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
  17 void 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
  30 void 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
  54 void blkconf_apply_backend_options(BlockConf *conf)
  55 {
  56     BlockBackend *blk = conf->blk;
  57     BlockdevOnError rerror, werror;
  58     bool wce;
  59
  60     switch (conf->wce) {
  61     case ON_OFF_AUTO_ON:    wce = true; break;
  62     case ON_OFF_AUTO_OFF:   wce = false; break;
  63     case ON_OFF_AUTO_AUTO:  wce = blk_enable_write_cache(blk); break;
  64     default:
  65         abort();
  66     }
  67
  68     rerror = conf->rerror;
  69     if (rerror == BLOCKDEV_ON_ERROR_AUTO) {
  70         rerror = blk_get_on_error(blk, true);
  71     }
  72
  73     werror = conf->werror;
  74     if (werror == BLOCKDEV_ON_ERROR_AUTO) {
  75         werror = blk_get_on_error(blk, false);
  76     }
  77
  78     blk_set_enable_write_cache(blk, wce);
  79     blk_set_on_error(blk, rerror, werror);
  80 }
  81
  82 void blkconf_geometry(BlockConf *conf, int *ptrans,
  83                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
  84                       Error **errp)
  85 {
  86     DriveInfo *dinfo;
  87
  88     if (!conf->cyls && !conf->heads && !conf->secs) {
  89         /* try to fall back to value set with legacy -drive cyls=... */
  90         dinfo = blk_legacy_dinfo(conf->blk);
  91         if (dinfo) {
  92             conf->cyls  = dinfo->cyls;
  93             conf->heads = dinfo->heads;
  94             conf->secs  = dinfo->secs;
  95             if (ptrans) {
  96                 *ptrans = dinfo->trans;
  97             }
  98         }
  99     }
 100     if (!conf->cyls && !conf->heads && !conf->secs) {
 101         hd_geometry_guess(conf->blk,
 102                           &conf->cyls, &conf->heads, &conf->secs,
 103                           ptrans);
 104     } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
 105         *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
 106     }
 107     if (conf->cyls || conf->heads || conf->secs) {
 108         if (conf->cyls < 1 || conf->cyls > cyls_max) {
 109             error_setg(errp, "cyls must be between 1 and %u", cyls_max);
 110             return;
 111         }
 112         if (conf->heads < 1 || conf->heads > heads_max) {
 113             error_setg(errp, "heads must be between 1 and %u", heads_max);
 114             return;
 115         }
 116         if (conf->secs < 1 || conf->secs > secs_max) {
 117             error_setg(errp, "secs must be between 1 and %u", secs_max);
 118             return;
 119         }
 120     }
 121 }