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qemu-nbd: Use raw block driver for --offset

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Instead of implementing qemu-nbd --offset in the NBD code, just put a
raw block node with the requested offset on top of the user image and
rely on that doing the job.

This does not only simplify the nbd_export_new() interface and bring it
closer to the set of options that the nbd-server-add QMP command offers,
but in fact it also eliminates a potential source for bugs in the NBD
code which previously had to add the offset manually in all relevant
places.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200924152717.287415-7-kwolf@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf
2020-09-24 17:26:52 +02:00
parent 060102ad65
commit b57e4de079
4 changed files with 31 additions and 42 deletions
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9
blockdev-nbd.c
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@ -154,7 +154,6 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp)
BlockDriverState *bs = NULL;
BlockBackend *on_eject_blk;
NBDExport *exp = NULL;
int64_t len;
AioContext *aio_context;
assert(exp_args->type == BLOCK_EXPORT_TYPE_NBD);
@ -192,12 +191,6 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp)
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
len = bdrv_getlength(bs);
if (len < 0) {
error_setg_errno(errp, -len,
"Failed to determine the NBD export's length");
goto out;
}
if (!arg->has_writable) {
arg->writable = false;
@ -206,7 +199,7 @@ BlockExport *nbd_export_create(BlockExportOptions *exp_args, Error **errp)
arg->writable = false;
}
exp = nbd_export_new(bs, 0, len, arg->name, arg->description, arg->bitmap,
exp = nbd_export_new(bs, arg->name, arg->description, arg->bitmap,
!arg->writable, !arg->writable,
NULL, false, on_eject_blk, errp);
if (!exp) {