[Qemu-block] qcow2_open ignores EAGAIN

[Olaf Hering]

Consider this qemu-2.11 backtrace on the receiving side of a live migration:

qemu_lock_fd_test -> -EAGAIN
raw_check_lock_bytes
raw_handle_perm_lock
bdrv_check_perm
bdrv_check_update_perm
bdrv_root_attach_child -> throws error away
bdrv_attach_child
bdrv_open_child
qcow2_open
bdrv_open_driver
bdrv_open_common
bdrv_open_inherit
bdrv_open("/nfs/img.qcow2")
blk_new_open
blk_connect
xen_be_try_initialise
xen_be_check_state
xenstore_update
aio_dispatch_handlers
aio_dispatch
aio_ctx_dispatch
...

I wonder which layer is supposed to deal with the -EAGAIN,
and just keep going for a while?

Olaf

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