From 795d946d0797e7ba28ed97c86e2592e346b02b0e Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Tue, 7 Jul 2020 18:50:36 +0200 Subject: nbd: Use ERRP_GUARD() If we want to check error after errp-function call, we need to introduce local_err and then propagate it to errp. Instead, use the ERRP_GUARD() macro, benefits are: 1. No need of explicit error_propagate call 2. No need of explicit local_err variable: use errp directly 3. ERRP_GUARD() leaves errp as is if it's not NULL or &error_fatal, this means that we don't break error_abort (we'll abort on error_set, not on error_propagate) If we want to add some info to errp (by error_prepend() or error_append_hint()), we must use the ERRP_GUARD() macro. Otherwise, this info will not be added when errp == &error_fatal (the program will exit prior to the error_append_hint() or error_prepend() call). Fix several such cases, e.g. in nbd_read(). This commit is generated by command sed -n '/^Network Block Device (NBD)$/,/^$/{s/^F: //p}' \ MAINTAINERS | \ xargs git ls-files | grep '\.[hc]$' | \ xargs spatch \ --sp-file scripts/coccinelle/errp-guard.cocci \ --macro-file scripts/cocci-macro-file.h \ --in-place --no-show-diff --max-width 80 Reported-by: Kevin Wolf Reported-by: Greg Kurz Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Markus Armbruster [Commit message tweaked] Signed-off-by: Markus Armbruster Message-Id: <20200707165037.1026246-8-armbru@redhat.com> Reviewed-by: Eric Blake [ERRP_AUTO_PROPAGATE() renamed to ERRP_GUARD(), and auto-propagated-errp.cocci to errp-guard.cocci. Commit message tweaked again.] --- nbd/client.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'nbd/client.c') diff --git a/nbd/client.c b/nbd/client.c index ba173108ba..0c2db4bcba 100644 --- a/nbd/client.c +++ b/nbd/client.c @@ -68,6 +68,7 @@ static int nbd_send_option_request(QIOChannel *ioc, uint32_t opt, uint32_t len, const char *data, Error **errp) { + ERRP_GUARD(); NBDOption req; QEMU_BUILD_BUG_ON(sizeof(req) != 16); @@ -153,6 +154,7 @@ static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt, static int nbd_handle_reply_err(QIOChannel *ioc, NBDOptionReply *reply, bool strict, Error **errp) { + ERRP_GUARD(); g_autofree char *msg = NULL; if (!(reply->type & (1 << 31))) { @@ -337,6 +339,7 @@ static int nbd_receive_list(QIOChannel *ioc, char **name, char **description, static int nbd_opt_info_or_go(QIOChannel *ioc, uint32_t opt, NBDExportInfo *info, Error **errp) { + ERRP_GUARD(); NBDOptionReply reply; uint32_t len = strlen(info->name); uint16_t type; @@ -882,6 +885,7 @@ static int nbd_start_negotiate(AioContext *aio_context, QIOChannel *ioc, bool structured_reply, bool *zeroes, Error **errp) { + ERRP_GUARD(); uint64_t magic; trace_nbd_start_negotiate(tlscreds, hostname ? hostname : ""); @@ -1017,6 +1021,7 @@ int nbd_receive_negotiate(AioContext *aio_context, QIOChannel *ioc, const char *hostname, QIOChannel **outioc, NBDExportInfo *info, Error **errp) { + ERRP_GUARD(); int result; bool zeroes; bool base_allocation = info->base_allocation; -- cgit 1.4.1