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qemufile: Always return a verbose error

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There're a lot of cases where we only have an errno set in last_error but
without a detailed error description.  When this happens, try to generate
an error contains the errno as a descriptive error.

This will be helpful in cases where one relies on the Error*.  E.g.,
migration state only caches Error* in MigrationState.error.  With this,
we'll display correct error messages in e.g. query-migrate when the error
was only set by qemu_file_set_error().

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231004220240.167175-6-peterx@redhat.com>
This commit is contained in:
Peter Xu 2023-10-04 18:02:35 -04:00 committed by Juan Quintela
parent 2b2f6f411e
commit f4b897f485
1 changed files with 13 additions and 4 deletions
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17
migration/qemu-file.c
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@ -142,15 +142,24 @@ void qemu_file_set_hooks(QEMUFile *f, const QEMUFileHooks *hooks)
*
* Return negative error value if there has been an error on previous
* operations, return 0 if no error happened.
* Optional, it returns Error* in errp, but it may be NULL even if return value
* is not 0.
*
* If errp is specified, a verbose error message will be copied over.
*/
static int qemu_file_get_error_obj(QEMUFile *f, Error **errp)
{
if (errp) {
*errp = f->last_error_obj ? error_copy(f->last_error_obj) : NULL;
if (!f->last_error) {
return 0;
}
/* There is an error */
if (errp) {
if (f->last_error_obj) {
*errp = error_copy(f->last_error_obj);
} else {
error_setg_errno(errp, -f->last_error, "Channel error");
}
}
return f->last_error;
}