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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.21.126; envelope-from=vsementsov@virtuozzo.com; helo=EUR05-VI1-obe.outbound.protection.outlook.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, vsementsov@virtuozzo.com, berto@igalia.com, pavel.dovgaluk@ispras.ru, qemu-devel@nongnu.org, armbru@redhat.com, stefanha@redhat.com, pbonzini@redhat.com, mreitz@redhat.com, jsnow@redhat.com, ari@tuxera.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) Content-Type: text/plain; charset="utf-8" The recommended use of qemu error api assumes returning status together with setting errp and avoid void functions with errp parameter. Let's improve bdrv_append and some friends to reduce error-propagation overhead in further patches. Choose int return status, because bdrv_replace_node_common() has call to bdrv_check_update_perm(), which reports int status, which seems correct to propagate. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Alberto Garcia --- include/block/block.h | 12 ++++----- block.c | 58 +++++++++++++++++++++++++++---------------- 2 files changed, 43 insertions(+), 27 deletions(-) diff --git a/include/block/block.h b/include/block/block.h index a193545b6a..b4e0347b49 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -354,10 +354,10 @@ int bdrv_create(BlockDriver *drv, const char* filenam= e, int bdrv_create_file(const char *filename, QemuOpts *opts, Error **errp); =20 BlockDriverState *bdrv_new(void); -void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, - Error **errp); -void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, - Error **errp); +int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, + Error **errp); +int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, + Error **errp); =20 int bdrv_parse_aio(const char *mode, int *flags); int bdrv_parse_cache_mode(const char *mode, int *flags, bool *writethrough= ); @@ -369,8 +369,8 @@ BdrvChild *bdrv_open_child(const char *filename, BdrvChildRole child_role, bool allow_none, Error **errp); BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp); -void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_h= d, - Error **errp); +int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, + Error **errp); int bdrv_open_backing_file(BlockDriverState *bs, QDict *parent_options, const char *bdref_key, Error **errp); BlockDriverState *bdrv_open(const char *filename, const char *reference, diff --git a/block.c b/block.c index 8b9d457546..fecfe27d5e 100644 --- a/block.c +++ b/block.c @@ -2827,14 +2827,15 @@ static BdrvChildRole bdrv_backing_role(BlockDriverS= tate *bs) * Sets the bs->backing link of a BDS. A new reference is created; callers * which don't need their own reference any more must call bdrv_unref(). */ -void bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_h= d, - Error **errp) +int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd, + Error **errp) { + int ret =3D 0; bool update_inherits_from =3D bdrv_chain_contains(bs, backing_hd) && bdrv_inherits_from_recursive(backing_hd, bs); =20 if (bdrv_is_backing_chain_frozen(bs, child_bs(bs->backing), errp)) { - return; + return -EPERM; } =20 if (backing_hd) { @@ -2853,15 +2854,22 @@ void bdrv_set_backing_hd(BlockDriverState *bs, Bloc= kDriverState *backing_hd, =20 bs->backing =3D bdrv_attach_child(bs, backing_hd, "backing", &child_of= _bds, bdrv_backing_role(bs), errp); + if (!bs->backing) { + ret =3D -EPERM; + goto out; + } + /* If backing_hd was already part of bs's backing chain, and * inherits_from pointed recursively to bs then let's update it to * point directly to bs (else it will become NULL). */ - if (bs->backing && update_inherits_from) { + if (update_inherits_from) { backing_hd->inherits_from =3D bs; } =20 out: bdrv_refresh_limits(bs, NULL); + + return ret; } =20 /* @@ -4533,9 +4541,9 @@ static bool should_update_child(BdrvChild *c, BlockDr= iverState *to) * With auto_skip=3Dfalse the error is returned if from has a parent which= should * not be updated. */ -static void bdrv_replace_node_common(BlockDriverState *from, - BlockDriverState *to, - bool auto_skip, Error **errp) +static int bdrv_replace_node_common(BlockDriverState *from, + BlockDriverState *to, + bool auto_skip, Error **errp) { BdrvChild *c, *next; GSList *list =3D NULL, *p; @@ -4557,11 +4565,13 @@ static void bdrv_replace_node_common(BlockDriverSta= te *from, if (auto_skip) { continue; } + ret =3D -EINVAL; error_setg(errp, "Should not change '%s' link to '%s'", c->name, from->node_name); goto out; } if (c->frozen) { + ret =3D -EPERM; error_setg(errp, "Cannot change '%s' link to '%s'", c->name, from->node_name); goto out; @@ -4592,14 +4602,18 @@ static void bdrv_replace_node_common(BlockDriverSta= te *from, =20 bdrv_set_perm(to); =20 + ret =3D 0; + out: g_slist_free(list); bdrv_drained_end(from); bdrv_unref(from); + + return ret; } =20 -void bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, - Error **errp) +int bdrv_replace_node(BlockDriverState *from, BlockDriverState *to, + Error **errp) { return bdrv_replace_node_common(from, to, true, errp); } @@ -4620,28 +4634,30 @@ void bdrv_replace_node(BlockDriverState *from, Bloc= kDriverState *to, * parents of bs_top after bdrv_append() returns. If the caller needs to k= eep a * reference of its own, it must call bdrv_ref(). */ -void bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, - Error **errp) +int bdrv_append(BlockDriverState *bs_new, BlockDriverState *bs_top, + Error **errp) { - Error *local_err =3D NULL; - - bdrv_set_backing_hd(bs_new, bs_top, &local_err); - if (local_err) { - error_propagate(errp, local_err); + int ret =3D bdrv_set_backing_hd(bs_new, bs_top, errp); + if (ret < 0) { goto out; } =20 - bdrv_replace_node(bs_top, bs_new, &local_err); - if (local_err) { - error_propagate(errp, local_err); + ret =3D bdrv_replace_node(bs_top, bs_new, errp); + if (ret < 0) { bdrv_set_backing_hd(bs_new, NULL, &error_abort); goto out; } =20 - /* bs_new is now referenced by its new parents, we don't need the - * additional reference any more. */ + ret =3D 0; + out: + /* + * bs_new is now referenced by its new parents, we don't need the + * additional reference any more. + */ bdrv_unref(bs_new); + + return ret; } =20 static void bdrv_delete(BlockDriverState *bs) --=20 2.29.2