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 bool 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 false;
  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     return true;
 104 }
 105
 106 bool blkconf_geometry(BlockConf *conf, int *ptrans,
 107                       unsigned cyls_max, unsigned heads_max, unsigned secs_max,
 108                       Error **errp)
 109 {
 110     DriveInfo *dinfo;
 111
 112     if (!conf->cyls && !conf->heads && !conf->secs) {
 113         /* try to fall back to value set with legacy -drive cyls=... */
 114         dinfo = blk_legacy_dinfo(conf->blk);
 115         if (dinfo) {
 116             conf->cyls  = dinfo->cyls;
 117             conf->heads = dinfo->heads;
 118             conf->secs  = dinfo->secs;
 119             if (ptrans) {
 120                 *ptrans = dinfo->trans;
 121             }
 122         }
 123     }
 124     if (!conf->cyls && !conf->heads && !conf->secs) {
 125         hd_geometry_guess(conf->blk,
 126                           &conf->cyls, &conf->heads, &conf->secs,
 127                           ptrans);
 128     } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
 129         *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
 130     }
 131     if (conf->cyls || conf->heads || conf->secs) {
 132         if (conf->cyls < 1 || conf->cyls > cyls_max) {
 133             error_setg(errp, "cyls must be between 1 and %u", cyls_max);
 134             return false;
 135         }
 136         if (conf->heads < 1 || conf->heads > heads_max) {
 137             error_setg(errp, "heads must be between 1 and %u", heads_max);
 138             return false;
 139         }
 140         if (conf->secs < 1 || conf->secs > secs_max) {
 141             error_setg(errp, "secs must be between 1 and %u", secs_max);
 142             return false;
 143         }
 144     }
 145     return true;
 146 }