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_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
  42 bool 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
  94 bool 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 }