On 10/11/19 11:05 AM, Vladimir Sementsov-Ogievskiy wrote:
If we want to add some info to errp (by error_prepend() or error_append_hint()), we must use the ERRP_AUTO_PROPAGATE macro. Otherwise, this info will not be added when errp == &fatal_err (the program will exit prior to the error_append_hint() or error_prepend() call). Fix such cases.If we want to check error after errp-function call, we need to introduce local_err and than propagate it to errp. Instead, use ERRP_AUTO_PROPAGATE macro, benefits are: 1. No need of explicit error_propagate call 2. No need of explicit local_err variable: use errp directly 3. ERRP_AUTO_PROPAGATE leaves errp as is if it's not NULL or &error_fatel, this means that we don't break error_abort (we'll abort on error_set, not on error_propagate)
Reported-by: Kevin Wolf <kw...@redhat.com> Reported-by: Greg Kurz <gr...@kaod.org> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> --- include/block/nbd.h | 1 + block/nbd.c | 49 +++++++++++++++++++++------------------------ nbd/client.c | 5 +++++ nbd/server.c | 5 +++++ 4 files changed, 34 insertions(+), 26 deletions(-)
One of the few patches with a net gain rather than loss of lines, but that's because of lots of error_prepend use (where you add the macro without removing error_propagate).
Reviewed-by: Eric Blake <ebl...@redhat.com> -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
