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block/rbd: report a better error when namespace does not exist

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If the namespace does not exist, rbd_create() fails with -ENOENT and
QEMU reports a generic "error rbd create: No such file or directory":

    $ qemu-img create rbd:rbd/namespace/image 1M
    Formatting 'rbd:rbd/namespace/image', fmt=raw size=1048576
    qemu-img: rbd:rbd/namespace/image: error rbd create: No such file or directory

Unfortunately rados_ioctx_set_namespace() does not fail if the namespace
does not exist, so let's use rbd_namespace_exists() in qemu_rbd_connect()
to check if the namespace exists, reporting a more understandable error:

    $ qemu-img create rbd:rbd/namespace/image 1M
    Formatting 'rbd:rbd/namespace/image', fmt=raw size=1048576
    qemu-img: rbd:rbd/namespace/image: namespace 'namespace' does not exist

Reported-by: Tingting Mao <timao@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220517071012.6120-1-sgarzare@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Stefano Garzarella 2022-05-17 09:10:12 +02:00 committed by Kevin Wolf
parent ca941c406c
commit 66dc5f9606
2 changed files with 30 additions and 0 deletions
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24
block/rbd.c
View file

@ -831,6 +831,26 @@ static int qemu_rbd_connect(rados_t *cluster, rados_ioctx_t *io_ctx,
error_setg_errno(errp, -r, "error opening pool %s", opts->pool);
goto failed_shutdown;
}
#ifdef HAVE_RBD_NAMESPACE_EXISTS
if (opts->has_q_namespace && strlen(opts->q_namespace) > 0) {
bool exists;
r = rbd_namespace_exists(*io_ctx, opts->q_namespace, &exists);
if (r < 0) {
error_setg_errno(errp, -r, "error checking namespace");
goto failed_ioctx_destroy;
}
if (!exists) {
error_setg(errp, "namespace '%s' does not exist",
opts->q_namespace);
r = -ENOENT;
goto failed_ioctx_destroy;
}
}
#endif
/*
* Set the namespace after opening the io context on the pool,
* if nspace == NULL or if nspace == "", it is just as we did nothing
@ -840,6 +860,10 @@ static int qemu_rbd_connect(rados_t *cluster, rados_ioctx_t *io_ctx,
r = 0;
goto out;
#ifdef HAVE_RBD_NAMESPACE_EXISTS
failed_ioctx_destroy:
rados_ioctx_destroy(*io_ctx);
#endif
failed_shutdown:
rados_shutdown(*cluster);
out:

6
meson.build
View file

@ -1903,6 +1903,12 @@ config_host_data.set('HAVE_GETIFADDRS', cc.has_function('getifaddrs'))
config_host_data.set('HAVE_OPENPTY', cc.has_function('openpty', dependencies: util))
config_host_data.set('HAVE_STRCHRNUL', cc.has_function('strchrnul'))
config_host_data.set('HAVE_SYSTEM_FUNCTION', cc.has_function('system', prefix: '#include <stdlib.h>'))
if rbd.found()
config_host_data.set('HAVE_RBD_NAMESPACE_EXISTS',
cc.has_function('rbd_namespace_exists',
dependencies: rbd,
prefix: '#include <rbd/librbd.h>'))
endif
if rdma.found()
config_host_data.set('HAVE_IBV_ADVISE_MR',
cc.has_function('ibv_advise_mr',