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bh=6LqlTTJLqWWej5geJxZq0+mUC/xpTfRvfcUtmMrQ1uU=; b=FlpNioEqS/rgu3UtYlBDz1M77YSaJOy3dyr/k0TXdi3lzEcIkMMz7fu8ajm/trDpG8gqjP Gh3U9mdiPTc5HuowXOWXH39A23mkovfk1WOcr8PGaJzOI4065liClgte03hQ9XSYa+HhCR fH4tFYEhWS8Hivm04a0/ZqcC8iSJrOU= X-MC-Unique: hqWpEj3mPhaTX1oQopbOkw-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PULL v2 12/20] block/io: support int64_t bytes in bdrv_aligned_pwritev() Date: Wed, 3 Feb 2021 08:24:28 -0600 Message-Id: <20210203142436.703098-13-eblake@redhat.com> In-Reply-To: <20210203142436.703098-1-eblake@redhat.com> References: <20210203142436.703098-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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=216.205.24.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.539, 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_H3=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). So, prepare bdrv_aligned_pwritev() now and convert the dependencies: bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() to signed type bytes. Conversion of bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() is definitely safe, as all requests in block/io must not overflow BDRV_MAX_LENGTH. Still add assertions. For bdrv_aligned_pwritev() 'bytes' type is widened, so callers are safe. Let's check usage of the parameter inside the function. Passing to bdrv_co_write_req_prepare() and bdrv_co_write_req_finish() is OK. Passing to qemu_iovec_* is OK after new assertion. All other callees are already updated to int64_t. Checking alignment is not changed, offset + bytes and qiov_offset + bytes calculations are safe (thanks to new assertions). max_transfer is kept to be int for now. It has a default of INT_MAX here, and some drivers may rely on it. It's to be refactored later. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20201211183934.169161-12-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake Signed-off-by: Eric Blake --- block/io.c | 21 +++++++++++++-------- 1 file changed, 13 insertions(+), 8 deletions(-) diff --git a/block/io.c b/block/io.c index 98d9f5bdf48a..59ae0a110da1 100644 --- a/block/io.c +++ b/block/io.c @@ -1932,11 +1932,12 @@ fail: } static inline int coroutine_fn -bdrv_co_write_req_prepare(BdrvChild *child, int64_t offset, uint64_t bytes, +bdrv_co_write_req_prepare(BdrvChild *child, int64_t offset, int64_t bytes, BdrvTrackedRequest *req, int flags) { BlockDriverState *bs =3D child->bs; - int64_t end_sector =3D DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE); + + bdrv_check_request(offset, bytes, &error_abort); if (bs->read_only) { return -EPERM; @@ -1963,7 +1964,8 @@ bdrv_co_write_req_prepare(BdrvChild *child, int64_t o= ffset, uint64_t bytes, assert(req->overlap_offset <=3D offset); assert(offset + bytes <=3D req->overlap_offset + req->overlap_bytes); - assert(end_sector <=3D bs->total_sectors || child->perm & BLK_PERM_RES= IZE); + assert(offset + bytes <=3D bs->total_sectors * BDRV_SECTOR_SIZE || + child->perm & BLK_PERM_RESIZE); switch (req->type) { case BDRV_TRACKED_WRITE: @@ -1984,12 +1986,14 @@ bdrv_co_write_req_prepare(BdrvChild *child, int64_t= offset, uint64_t bytes, } static inline void coroutine_fn -bdrv_co_write_req_finish(BdrvChild *child, int64_t offset, uint64_t bytes, +bdrv_co_write_req_finish(BdrvChild *child, int64_t offset, int64_t bytes, BdrvTrackedRequest *req, int ret) { int64_t end_sector =3D DIV_ROUND_UP(offset + bytes, BDRV_SECTOR_SIZE); BlockDriverState *bs =3D child->bs; + bdrv_check_request(offset, bytes, &error_abort); + qatomic_inc(&bs->write_gen); /* @@ -2026,16 +2030,18 @@ bdrv_co_write_req_finish(BdrvChild *child, int64_t = offset, uint64_t bytes, * after possibly fragmenting it. */ static int coroutine_fn bdrv_aligned_pwritev(BdrvChild *child, - BdrvTrackedRequest *req, int64_t offset, unsigned int bytes, + BdrvTrackedRequest *req, int64_t offset, int64_t bytes, int64_t align, QEMUIOVector *qiov, size_t qiov_offset, int flags) { BlockDriverState *bs =3D child->bs; BlockDriver *drv =3D bs->drv; int ret; - uint64_t bytes_remaining =3D bytes; + int64_t bytes_remaining =3D bytes; int max_transfer; + bdrv_check_qiov_request(offset, bytes, qiov, qiov_offset, &error_abort= ); + if (!drv) { return -ENOMEDIUM; } @@ -2047,7 +2053,6 @@ static int coroutine_fn bdrv_aligned_pwritev(BdrvChil= d *child, assert(is_power_of_2(align)); assert((offset & (align - 1)) =3D=3D 0); assert((bytes & (align - 1)) =3D=3D 0); - assert(!qiov || qiov_offset + bytes <=3D qiov->size); max_transfer =3D QEMU_ALIGN_DOWN(MIN_NON_ZERO(bs->bl.max_transfer, INT= _MAX), align); @@ -2146,7 +2151,7 @@ static int coroutine_fn bdrv_co_do_zero_pwritev(BdrvC= hild *child, assert(!bytes || (offset & (align - 1)) =3D=3D 0); if (bytes >=3D align) { /* Write the aligned part in the middle. */ - uint64_t aligned_bytes =3D bytes & ~(align - 1); + int64_t aligned_bytes =3D bytes & ~(align - 1); ret =3D bdrv_aligned_pwritev(child, req, offset, aligned_bytes, al= ign, NULL, 0, flags); if (ret < 0) { --=20 2.30.0