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block: Add blk_new_with_bs() helper

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There are several callers that need to create a new block backend from
an existing BDS; make the task slightly easier with a common helper
routine.

Suggested-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200424190903.522087-2-eblake@redhat.com>
[mreitz: Set @ret only in error paths, see
 https://lists.nongnu.org/archive/html/qemu-block/2020-04/msg01216.html]
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200428192648.749066-2-eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Eric Blake 2020-04-28 14:26:46 -05:00 • committed by Max Reitz
parent 52ea799e96
commit a3aeeab557
14 changed files with 75 additions and 59 deletions
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9
block/vmdk.c
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@ -2717,11 +2717,10 @@ static BlockBackend *vmdk_co_create_cb(int64_t size, int idx,
if (!bs) {
return NULL;
}
blk = blk_new(bdrv_get_aio_context(bs),
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE,
BLK_PERM_ALL);
if (blk_insert_bs(blk, bs, errp)) {
bdrv_unref(bs);
blk = blk_new_with_bs(bs,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE | BLK_PERM_RESIZE,
BLK_PERM_ALL, errp);
if (!blk) {
return NULL;
}
blk_set_allow_write_beyond_eof(blk, true);