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
  18 void 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
  31 void 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
  55 bool 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
 107 bool 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 }