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bh=CkgNGGGCbW6jGEmuUZWm70s6fIWw/oKgzH3bQagpJNQ=; b=h7ICnQ+eXZOqDVL5f3vLq4xlO4mutJbueYwDw5HVJz+lKPFhcholi5L2kdIQ+VeNd9d2db VID31VmLfY8axlUqML/XM+5h9VkXpjzfHMC5r8zjXjET05E77x6qEnka7C5m5y2us7X+Rc WfLGJic/7r9oiiqoXH777GHRm/sDWj4= X-MC-Unique: Uw_wwXPaMdiqC7Fn-c2W9g-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PULL 09/20] block: use int64_t as bytes type in tracked requests Date: Tue, 2 Feb 2021 16:45:18 -0600 Message-Id: <20210202224529.642055-10-eblake@redhat.com> In-Reply-To: <20210202224529.642055-1-eblake@redhat.com> References: <20210202224529.642055-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@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=63.128.21.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.386, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=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: Fam Zheng , Kevin Wolf , Vladimir Sementsov-Ogievskiy , "open list:Block I/O path" , Max Reitz , Stefan Hajnoczi 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" From: Vladimir Sementsov-Ogievskiy We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). All requests in block/io must not overflow BDRV_MAX_LENGTH, all external users of BdrvTrackedRequest already have corresponding assertions, so we are safe. Add some assertions still. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20201211183934.169161-9-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake Signed-off-by: Eric Blake --- include/block/block_int.h | 4 ++-- block/io.c | 14 +++++++---- block/io.c.rej | 50 ++++++++++----------------------------- 3 files changed, 24 insertions(+), 44 deletions(-) diff --git a/include/block/block_int.h b/include/block/block_int.h index 5bbbf9ee0af9..7f41f0990cc0 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -79,12 +79,12 @@ enum BdrvTrackedRequestType { typedef struct BdrvTrackedRequest { BlockDriverState *bs; int64_t offset; - uint64_t bytes; + int64_t bytes; enum BdrvTrackedRequestType type; bool serialising; int64_t overlap_offset; - uint64_t overlap_bytes; + int64_t overlap_bytes; QLIST_ENTRY(BdrvTrackedRequest) list; Coroutine *co; /* owner, used for deadlock detection */ diff --git a/block/io.c b/block/io.c index b56db913da30..1c23587d18c6 100644 --- a/block/io.c +++ b/block/io.c @@ -717,10 +717,10 @@ static void tracked_request_end(BdrvTrackedRequest *r= eq) static void tracked_request_begin(BdrvTrackedRequest *req, BlockDriverState *bs, int64_t offset, - uint64_t bytes, + int64_t bytes, enum BdrvTrackedRequestType type) { - assert(bytes <=3D INT64_MAX && offset <=3D INT64_MAX - bytes); + bdrv_check_request(offset, bytes, &error_abort); *req =3D (BdrvTrackedRequest){ .bs =3D bs, @@ -741,8 +741,10 @@ static void tracked_request_begin(BdrvTrackedRequest *= req, } static bool tracked_request_overlaps(BdrvTrackedRequest *req, - int64_t offset, uint64_t bytes) + int64_t offset, int64_t bytes) { + bdrv_check_request(offset, bytes, &error_abort); + /* aaaa bbbb */ if (offset >=3D req->overlap_offset + req->overlap_bytes) { return false; @@ -810,8 +812,10 @@ static void tracked_request_set_serialising(BdrvTracke= dRequest *req, uint64_t align) { int64_t overlap_offset =3D req->offset & ~(align - 1); - uint64_t overlap_bytes =3D ROUND_UP(req->offset + req->bytes, align) - - overlap_offset; + int64_t overlap_bytes =3D + ROUND_UP(req->offset + req->bytes, align) - overlap_offset; + + bdrv_check_request(req->offset, req->bytes, &error_abort); if (!req->serialising) { qatomic_inc(&req->bs->serialising_in_flight); diff --git a/block/io.c.rej b/block/io.c.rej index f52df016263b..ae2f972d1af9 100644 --- a/block/io.c.rej +++ b/block/io.c.rej @@ -1,40 +1,16 @@ diff a/block/io.c b/block/io.c (rejected hunks) -@@ -2138,20 +2139,32 @@ int coroutine_fn bdrv_co_pwritev_part(BdrvChild *c= hild, - return 0; - } +@@ -798,10 +800,12 @@ bool bdrv_mark_request_serialising(BdrvTrackedReques= t *req, uint64_t align) + { + BlockDriverState *bs =3D req->bs; + int64_t overlap_offset =3D req->offset & ~(align - 1); +- uint64_t overlap_bytes =3D ROUND_UP(req->offset + req->bytes, align) +- - overlap_offset; ++ int64_t overlap_bytes =3D ++ ROUND_UP(req->offset + req->bytes, align) - overlap_offset; + bool waited; =20 -+ if (!(flags & BDRV_REQ_ZERO_WRITE)) { -+ /* -+ * Pad request for following read-modify-write cycle. -+ * bdrv_co_do_zero_pwritev() does aligning by itself, so, we do -+ * alignment only if there is no ZERO flag. -+ */ -+ padded =3D bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &by= tes, -+ &pad); -+ } ++ bdrv_check_request(req->offset, req->bytes, &error_abort); + - bdrv_inc_in_flight(bs); -- /* -- * Align write if necessary by performing a read-modify-write cycle. -- * Pad qiov with the read parts and be sure to have a tracked request= not -- * only for bdrv_aligned_pwritev, but also for the reads of the RMW c= ycle. -- */ - tracked_request_begin(&req, bs, offset, bytes, BDRV_TRACKED_WRITE); -=20 - if (flags & BDRV_REQ_ZERO_WRITE) { -+ assert(!padded); - ret =3D bdrv_co_do_zero_pwritev(child, offset, bytes, flags, &req= ); - goto out; - } -=20 -- if (bdrv_pad_request(bs, &qiov, &qiov_offset, &offset, &bytes, &pad))= { -+ if (padded) { -+ /* -+ * Request was unaligned to request_alignment and therefore padde= d. -+ * We are going to do read-modify-write. User is not prepared to = widened -+ * request intersections with other requests, so we serialize the -+ * request. -+ */ - bdrv_mark_request_serialising(&req, align); - bdrv_padding_rmw_read(child, &req, &pad, false); - } + qemu_co_mutex_lock(&bs->reqs_lock); + if (!req->serialising) { + qatomic_inc(&req->bs->serialising_in_flight); --=20 2.30.0