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, 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; 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 } 103 104 void blkconf_geometry(BlockConf *conf, int *ptrans, 105 unsigned cyls_max, unsigned heads_max, unsigned secs_max, 106 Error **errp) 107 { 108 DriveInfo *dinfo; 109 110 if (!conf->cyls && !conf->heads && !conf->secs) { 111 /* try to fall back to value set with legacy -drive cyls=... */ 112 dinfo = blk_legacy_dinfo(conf->blk); 113 if (dinfo) { 114 conf->cyls = dinfo->cyls; 115 conf->heads = dinfo->heads; 116 conf->secs = dinfo->secs; 117 if (ptrans) { 118 *ptrans = dinfo->trans; 119 } 120 } 121 } 122 if (!conf->cyls && !conf->heads && !conf->secs) { 123 hd_geometry_guess(conf->blk, 124 &conf->cyls, &conf->heads, &conf->secs, 125 ptrans); 126 } else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) { 127 *ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs); 128 } 129 if (conf->cyls || conf->heads || conf->secs) { 130 if (conf->cyls < 1 || conf->cyls > cyls_max) { 131 error_setg(errp, "cyls must be between 1 and %u", cyls_max); 132 return; 133 } 134 if (conf->heads < 1 || conf->heads > heads_max) { 135 error_setg(errp, "heads must be between 1 and %u", heads_max); 136 return; 137 } 138 if (conf->secs < 1 || conf->secs > secs_max) { 139 error_setg(errp, "secs must be between 1 and %u", secs_max); 140 return; 141 } 142 } 143 } 144