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iscsi: add iscsi_create support 

This patch adds support for bdrv_create. This allows e.g.
to use qemu-img to convert from any supported device to
an iscsi backed storage as destination.

Signed-off-by: Peter Lieven <pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Lieven 2012-11-17 16:13:24 +01:00 committed by Paolo Bonzini
parent fedf2de310
commit de8864e5ae
1 changed files with 52 additions and 0 deletions
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52
block/iscsi.c
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@ -957,6 +957,56 @@ static int iscsi_has_zero_init(BlockDriverState *bs)
return 0;
}
static int iscsi_create(const char *filename, QEMUOptionParameter *options)
{
int ret = 0;
int64_t total_size = 0;
BlockDriverState bs;
IscsiLun *iscsilun = NULL;
memset(&bs, 0, sizeof(BlockDriverState));
/* Read out options */
while (options && options->name) {
if (!strcmp(options->name, "size")) {
total_size = options->value.n / BDRV_SECTOR_SIZE;
}
options++;
}
bs.opaque = g_malloc0(sizeof(struct IscsiLun));
iscsilun = bs.opaque;
ret = iscsi_open(&bs, filename, 0);
if (ret != 0) {
goto out;
}
if (iscsilun->type != TYPE_DISK) {
ret = -ENODEV;
goto out;
}
if (bs.total_sectors < total_size) {
ret = -ENOSPC;
}
ret = 0;
out:
if (iscsilun->iscsi != NULL) {
iscsi_destroy_context(iscsilun->iscsi);
}
g_free(bs.opaque);
return ret;
}
static QEMUOptionParameter iscsi_create_options[] = {
{
.name = BLOCK_OPT_SIZE,
.type = OPT_SIZE,
.help = "Virtual disk size"
},
{ NULL }
};
static BlockDriver bdrv_iscsi = {
.format_name = "iscsi",
.protocol_name = "iscsi",
@ -964,6 +1014,8 @@ static BlockDriver bdrv_iscsi = {
.instance_size = sizeof(IscsiLun),
.bdrv_file_open = iscsi_open,
.bdrv_close = iscsi_close,
.bdrv_create = iscsi_create,
.create_options = iscsi_create_options,
.bdrv_getlength = iscsi_getlength,