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bh=Ro20h428+MmQ1aHxt24h1z4UYKTh74mpEKt522DW974=; b=VK0jKvRoNZHhzKL6wrEJJtVtf3o0kza3BLZVtUuA5moN52sip63+TFlBEjlAzSO0USNPU5 pg6jcdGsDAASo7ULfoW355QbBrjTwL6pgPKcyrk3UvQ2YB9fd0NlZu/gA8vkR4SPNCOxKa V6k4GTSIbVK1WD7IwPRtM6XNiCw94bY= X-MC-Unique: nseocApXNtKdLI62IGyCBg-1 From: Emanuele Giuseppe Esposito To: qemu-block@nongnu.org Cc: Kevin Wolf , Hanna Reitz , John Snow , Paolo Bonzini , Vladimir Sementsov-Ogievskiy , Stefan Hajnoczi , Fam Zheng , Eric Blake , qemu-devel@nongnu.org, Emanuele Giuseppe Esposito Subject: [PATCH 3/6] block: assert that BlockDriver->bdrv_co_copy_range_{from/to} is always called with graph rdlock taken Date: Wed, 16 Nov 2022 08:53:28 -0500 Message-Id: <20221116135331.3052923-4-eesposit@redhat.com> In-Reply-To: <20221116135331.3052923-1-eesposit@redhat.com> References: <20221116135331.3052923-1-eesposit@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 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=170.10.129.124; envelope-from=eesposit@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1668607159549100001 Content-Type: text/plain; charset="utf-8" The only non-protected caller is convert_co_copy_range(), all other callers are BlockDriver callbacks that already take the rdlock. Signed-off-by: Emanuele Giuseppe Esposito --- block/block-backend.c | 2 ++ block/io.c | 5 +++++ include/block/block_int-common.h | 4 ++++ qemu-img.c | 4 +++- 4 files changed, 14 insertions(+), 1 deletion(-) diff --git a/block/block-backend.c b/block/block-backend.c index 9e1c689e84..6f0dd15808 100644 --- a/block/block-backend.c +++ b/block/block-backend.c @@ -2631,6 +2631,8 @@ int coroutine_fn blk_co_copy_range(BlockBackend *blk_= in, int64_t off_in, if (r) { return r; } + + GRAPH_RDLOCK_GUARD(); return bdrv_co_copy_range(blk_in->root, off_in, blk_out->root, off_out, bytes, read_flags, write_flags); diff --git a/block/io.c b/block/io.c index 831f277e85..62c0b3a390 100644 --- a/block/io.c +++ b/block/io.c @@ -3165,6 +3165,7 @@ static int coroutine_fn bdrv_co_copy_range_internal( { BdrvTrackedRequest req; int ret; + assert_bdrv_graph_readable(); =20 /* TODO We can support BDRV_REQ_NO_FALLBACK here */ assert(!(read_flags & BDRV_REQ_NO_FALLBACK)); @@ -3246,6 +3247,7 @@ int coroutine_fn bdrv_co_copy_range_from(BdrvChild *s= rc, int64_t src_offset, BdrvRequestFlags write_flags) { IO_CODE(); + assert_bdrv_graph_readable(); trace_bdrv_co_copy_range_from(src, src_offset, dst, dst_offset, bytes, read_flags, write_flags); return bdrv_co_copy_range_internal(src, src_offset, dst, dst_offset, @@ -3263,6 +3265,7 @@ int coroutine_fn bdrv_co_copy_range_to(BdrvChild *src= , int64_t src_offset, BdrvRequestFlags write_flags) { IO_CODE(); + assert_bdrv_graph_readable(); trace_bdrv_co_copy_range_to(src, src_offset, dst, dst_offset, bytes, read_flags, write_flags); return bdrv_co_copy_range_internal(src, src_offset, dst, dst_offset, @@ -3275,6 +3278,8 @@ int coroutine_fn bdrv_co_copy_range(BdrvChild *src, i= nt64_t src_offset, BdrvRequestFlags write_flags) { IO_CODE(); + assert_bdrv_graph_readable(); + return bdrv_co_copy_range_from(src, src_offset, dst, dst_offset, bytes, read_flags, write_flags); diff --git a/include/block/block_int-common.h b/include/block/block_int-com= mon.h index 1e9bb91c98..9e441cb93b 100644 --- a/include/block/block_int-common.h +++ b/include/block/block_int-common.h @@ -574,6 +574,8 @@ struct BlockDriver { * * See the comment of bdrv_co_copy_range for the parameter and return = value * semantics. + * + * Called with graph rdlock taken. */ int coroutine_fn (*bdrv_co_copy_range_from)(BlockDriverState *bs, BdrvChild *src, @@ -592,6 +594,8 @@ struct BlockDriver { * * See the comment of bdrv_co_copy_range for the parameter and return = value * semantics. + * + * Called with graph rdlock taken. */ int coroutine_fn (*bdrv_co_copy_range_to)(BlockDriverState *bs, BdrvChild *src, diff --git a/qemu-img.c b/qemu-img.c index 33703a6d92..2086cf6eed 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -2027,7 +2027,9 @@ retry: =20 if (s->ret =3D=3D -EINPROGRESS) { if (copy_range) { - ret =3D convert_co_copy_range(s, sector_num, n); + WITH_GRAPH_RDLOCK_GUARD() { + ret =3D convert_co_copy_range(s, sector_num, n); + } if (ret) { s->copy_range =3D false; goto retry; --=20 2.31.1