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bh=/6b5+AhmJqfcAVLzmBshbRXCmakDyehOcVwSaIyUfs8=; b=gjz/T1Qe7VlOkwiqc/iZ3EibbjAlegHqt8u22SSsRjeLMUUZaFD7n1+D/APyeAB+dlXpqX FQk9r642tCVzlt/3d2eH9ZxLa5ouqt+SPVr5p/cF55GNydOfmCbnm0PYFcef8oeOYC7+0W hK21QMI96/H53597DAMXwTIpVcSsocM= X-MC-Unique: 55exWMUNMyG9mehKiC9jwA-1 From: Max Reitz To: qemu-block@nongnu.org Subject: [PATCH v7 02/47] block: Add chain helper functions Date: Thu, 25 Jun 2020 17:21:30 +0200 Message-Id: <20200625152215.941773-3-mreitz@redhat.com> In-Reply-To: <20200625152215.941773-1-mreitz@redhat.com> References: <20200625152215.941773-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=205.139.110.61; envelope-from=mreitz@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 00:45:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=_AUTOLEARN 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: Kevin Wolf , Vladimir Sementsov-Ogievskiy , qemu-devel@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" Add some helper functions for skipping filters in a chain of block nodes. Signed-off-by: Max Reitz Reviewed-by: Andrey Shinkevich Reviewed-by: Vladimir Sementsov-Ogievskiy --- include/block/block_int.h | 3 +++ block.c | 55 +++++++++++++++++++++++++++++++++++++++ 2 files changed, 58 insertions(+) diff --git a/include/block/block_int.h b/include/block/block_int.h index bb3457c5e8..5da793bfc3 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -1382,6 +1382,9 @@ BdrvChild *bdrv_cow_child(BlockDriverState *bs); BdrvChild *bdrv_filter_child(BlockDriverState *bs); BdrvChild *bdrv_filter_or_cow_child(BlockDriverState *bs); BdrvChild *bdrv_primary_child(BlockDriverState *bs); +BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs); +BlockDriverState *bdrv_skip_filters(BlockDriverState *bs); +BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs); =20 static inline BlockDriverState *child_bs(BdrvChild *child) { diff --git a/block.c b/block.c index 5a42ef49fd..0a0b855261 100644 --- a/block.c +++ b/block.c @@ -7008,3 +7008,58 @@ BdrvChild *bdrv_primary_child(BlockDriverState *bs) =20 return NULL; } + +static BlockDriverState *bdrv_do_skip_filters(BlockDriverState *bs, + bool stop_on_explicit_filter) +{ + BdrvChild *c; + + if (!bs) { + return NULL; + } + + while (!(stop_on_explicit_filter && !bs->implicit)) { + c =3D bdrv_filter_child(bs); + if (!c) { + break; + } + bs =3D c->bs; + } + /* + * Note that this treats nodes with bs->drv =3D=3D NULL as not being + * filters (bs->drv =3D=3D NULL should be replaced by something else + * anyway). + * The advantage of this behavior is that this function will thus + * always return a non-NULL value (given a non-NULL @bs). + */ + + return bs; +} + +/* + * Return the first BDS that has not been added implicitly or that + * does not have a filtered child down the chain starting from @bs + * (including @bs itself). + */ +BlockDriverState *bdrv_skip_implicit_filters(BlockDriverState *bs) +{ + return bdrv_do_skip_filters(bs, true); +} + +/* + * Return the first BDS that does not have a filtered child down the + * chain starting from @bs (including @bs itself). + */ +BlockDriverState *bdrv_skip_filters(BlockDriverState *bs) +{ + return bdrv_do_skip_filters(bs, false); +} + +/* + * For a backing chain, return the first non-filter backing image of + * the first non-filter image. + */ +BlockDriverState *bdrv_backing_chain_next(BlockDriverState *bs) +{ + return bdrv_skip_filters(bdrv_cow_bs(bdrv_skip_filters(bs))); +} --=20 2.26.2