diff options
Diffstat (limited to 'block/vpc.c')
| -rw-r--r-- | block/vpc.c | 241 |
1 files changed, 185 insertions, 56 deletions
diff --git a/block/vpc.c b/block/vpc.c index b2e2b9ebd4..28ffa0d2f8 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -32,6 +32,9 @@ #include "migration/blocker.h" #include "qemu/bswap.h" #include "qemu/uuid.h" +#include "qapi/qmp/qdict.h" +#include "qapi/qobject-input-visitor.h" +#include "qapi/qapi-visit-block-core.h" /**************************************************************/ @@ -166,6 +169,8 @@ static QemuOptsList vpc_runtime_opts = { } }; +static QemuOptsList vpc_create_opts; + static uint32_t vpc_checksum(uint8_t* buf, size_t size) { uint32_t res = 0; @@ -897,60 +902,19 @@ static int create_fixed_disk(BlockBackend *blk, uint8_t *buf, return ret; } -static int coroutine_fn vpc_co_create_opts(const char *filename, QemuOpts *opts, - Error **errp) +static int calculate_rounded_image_size(BlockdevCreateOptionsVpc *vpc_opts, + uint16_t *out_cyls, + uint8_t *out_heads, + uint8_t *out_secs_per_cyl, + int64_t *out_total_sectors, + Error **errp) { - uint8_t buf[1024]; - VHDFooter *footer = (VHDFooter *) buf; - char *disk_type_param; - int i; + int64_t total_size = vpc_opts->size; uint16_t cyls = 0; uint8_t heads = 0; uint8_t secs_per_cyl = 0; int64_t total_sectors; - int64_t total_size; - int disk_type; - int ret = -EIO; - bool force_size; - Error *local_err = NULL; - BlockBackend *blk = NULL; - - /* Read out options */ - total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), - BDRV_SECTOR_SIZE); - disk_type_param = qemu_opt_get_del(opts, BLOCK_OPT_SUBFMT); - if (disk_type_param) { - if (!strcmp(disk_type_param, "dynamic")) { - disk_type = VHD_DYNAMIC; - } else if (!strcmp(disk_type_param, "fixed")) { - disk_type = VHD_FIXED; - } else { - error_setg(errp, "Invalid disk type, %s", disk_type_param); - ret = -EINVAL; - goto out; - } - } else { - disk_type = VHD_DYNAMIC; - } - - force_size = qemu_opt_get_bool_del(opts, VPC_OPT_FORCE_SIZE, false); - - ret = bdrv_create_file(filename, opts, &local_err); - if (ret < 0) { - error_propagate(errp, local_err); - goto out; - } - - blk = blk_new_open(filename, NULL, NULL, - BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, - &local_err); - if (blk == NULL) { - error_propagate(errp, local_err); - ret = -EIO; - goto out; - } - - blk_set_allow_write_beyond_eof(blk, true); + int i; /* * Calculate matching total_size and geometry. Increase the number of @@ -961,7 +925,7 @@ static int coroutine_fn vpc_co_create_opts(const char *filename, QemuOpts *opts, * we set the geometry to 65535 x 16 x 255 (CxHxS) sectors and use * the image size from the VHD footer to calculate total_sectors. */ - if (force_size) { + if (vpc_opts->force_size) { /* This will force the use of total_size for sector count, below */ cyls = VHD_CHS_MAX_C; heads = VHD_CHS_MAX_H; @@ -978,19 +942,95 @@ static int coroutine_fn vpc_co_create_opts(const char *filename, QemuOpts *opts, /* Allow a maximum disk size of 2040 GiB */ if (total_sectors > VHD_MAX_SECTORS) { error_setg(errp, "Disk size is too large, max size is 2040 GiB"); - ret = -EFBIG; - goto out; + return -EFBIG; } } else { - total_sectors = (int64_t)cyls * heads * secs_per_cyl; - total_size = total_sectors * BDRV_SECTOR_SIZE; + total_sectors = (int64_t) cyls * heads * secs_per_cyl; + } + + *out_total_sectors = total_sectors; + if (out_cyls) { + *out_cyls = cyls; + *out_heads = heads; + *out_secs_per_cyl = secs_per_cyl; + } + + return 0; +} + +static int coroutine_fn vpc_co_create(BlockdevCreateOptions *opts, + Error **errp) +{ + BlockdevCreateOptionsVpc *vpc_opts; + BlockBackend *blk = NULL; + BlockDriverState *bs = NULL; + + uint8_t buf[1024]; + VHDFooter *footer = (VHDFooter *) buf; + uint16_t cyls = 0; + uint8_t heads = 0; + uint8_t secs_per_cyl = 0; + int64_t total_sectors; + int64_t total_size; + int disk_type; + int ret = -EIO; + + assert(opts->driver == BLOCKDEV_DRIVER_VPC); + vpc_opts = &opts->u.vpc; + + /* Validate options and set default values */ + total_size = vpc_opts->size; + + if (!vpc_opts->has_subformat) { + vpc_opts->subformat = BLOCKDEV_VPC_SUBFORMAT_DYNAMIC; + } + switch (vpc_opts->subformat) { + case BLOCKDEV_VPC_SUBFORMAT_DYNAMIC: + disk_type = VHD_DYNAMIC; + break; + case BLOCKDEV_VPC_SUBFORMAT_FIXED: + disk_type = VHD_FIXED; + break; + default: + g_assert_not_reached(); + } + + /* Create BlockBackend to write to the image */ + bs = bdrv_open_blockdev_ref(vpc_opts->file, errp); + if (bs == NULL) { + return -EIO; + } + + blk = blk_new(BLK_PERM_WRITE | BLK_PERM_RESIZE, BLK_PERM_ALL); + ret = blk_insert_bs(blk, bs, errp); + if (ret < 0) { + goto out; + } + blk_set_allow_write_beyond_eof(blk, true); + + /* Get geometry and check that it matches the image size*/ + ret = calculate_rounded_image_size(vpc_opts, &cyls, &heads, &secs_per_cyl, + &total_sectors, errp); + if (ret < 0) { + goto out; + } + + if (total_size != total_sectors * BDRV_SECTOR_SIZE) { + error_setg(errp, "The requested image size cannot be represented in " + "CHS geometry"); + error_append_hint(errp, "Try size=%llu or force-size=on (the " + "latter makes the image incompatible with " + "Virtual PC)", + total_sectors * BDRV_SECTOR_SIZE); + ret = -EINVAL; + goto out; } /* Prepare the Hard Disk Footer */ memset(buf, 0, 1024); memcpy(footer->creator, "conectix", 8); - if (force_size) { + if (vpc_opts->force_size) { memcpy(footer->creator_app, "qem2", 4); } else { memcpy(footer->creator_app, "qemu", 4); @@ -1032,10 +1072,98 @@ static int coroutine_fn vpc_co_create_opts(const char *filename, QemuOpts *opts, out: blk_unref(blk); - g_free(disk_type_param); + bdrv_unref(bs); + return ret; +} + +static int coroutine_fn vpc_co_create_opts(const char *filename, + QemuOpts *opts, Error **errp) +{ + BlockdevCreateOptions *create_options = NULL; + QDict *qdict = NULL; + QObject *qobj; + Visitor *v; + BlockDriverState *bs = NULL; + Error *local_err = NULL; + int ret; + + static const QDictRenames opt_renames[] = { + { VPC_OPT_FORCE_SIZE, "force-size" }, + { NULL, NULL }, + }; + + /* Parse options and convert legacy syntax */ + qdict = qemu_opts_to_qdict_filtered(opts, NULL, &vpc_create_opts, true); + + if (!qdict_rename_keys(qdict, opt_renames, errp)) { + ret = -EINVAL; + goto fail; + } + + /* Create and open the file (protocol layer) */ + ret = bdrv_create_file(filename, opts, &local_err); + if (ret < 0) { + error_propagate(errp, local_err); + goto fail; + } + + bs = bdrv_open(filename, NULL, NULL, + BDRV_O_RDWR | BDRV_O_RESIZE | BDRV_O_PROTOCOL, errp); + if (bs == NULL) { + ret = -EIO; + goto fail; + } + + /* Now get the QAPI type BlockdevCreateOptions */ + qdict_put_str(qdict, "driver", "vpc"); + qdict_put_str(qdict, "file", bs->node_name); + + qobj = qdict_crumple(qdict, errp); + QDECREF(qdict); + qdict = qobject_to_qdict(qobj); + if (qdict == NULL) { + ret = -EINVAL; + goto fail; + } + + v = qobject_input_visitor_new_keyval(QOBJECT(qdict)); + visit_type_BlockdevCreateOptions(v, NULL, &create_options, &local_err); + visit_free(v); + + if (local_err) { + error_propagate(errp, local_err); + ret = -EINVAL; + goto fail; + } + + /* Silently round up size */ + assert(create_options->driver == BLOCKDEV_DRIVER_VPC); + create_options->u.vpc.size = + ROUND_UP(create_options->u.vpc.size, BDRV_SECTOR_SIZE); + + if (!create_options->u.vpc.force_size) { + int64_t total_sectors; + ret = calculate_rounded_image_size(&create_options->u.vpc, NULL, NULL, + NULL, &total_sectors, errp); + if (ret < 0) { + goto fail; + } + + create_options->u.vpc.size = total_sectors * BDRV_SECTOR_SIZE; + } + + + /* Create the vpc image (format layer) */ + ret = vpc_co_create(create_options, errp); + +fail: + QDECREF(qdict); + bdrv_unref(bs); + qapi_free_BlockdevCreateOptions(create_options); return ret; } + static int vpc_has_zero_init(BlockDriverState *bs) { BDRVVPCState *s = bs->opaque; @@ -1096,6 +1224,7 @@ static BlockDriver bdrv_vpc = { .bdrv_close = vpc_close, .bdrv_reopen_prepare = vpc_reopen_prepare, .bdrv_child_perm = bdrv_format_default_perms, + .bdrv_co_create = vpc_co_create, .bdrv_co_create_opts = vpc_co_create_opts, .bdrv_co_preadv = vpc_co_preadv, |