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envelope-from=vsementsov@virtuozzo.com; helo=EUR05-DB8-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/11 12:27:11 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -37 X-Spam_score: -3.8 X-Spam_bar: --- X-Spam_report: (-3.8 / 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=-1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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: kwolf@redhat.com, fam@euphon.net, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" When BDRV_REQ_NO_FALLBACK is supported, the NBD driver supports a larger request size. Add code to try large zero requests with a NO_FALLBACK request prior to having to split a request into chunks according to max_pwrite_zeroes. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/io.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/block/io.c b/block/io.c index 3fae97da2d..ad219cb220 100644 --- a/block/io.c +++ b/block/io.c @@ -1778,6 +1778,7 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, int alignment = MAX(bs->bl.pwrite_zeroes_alignment, bs->bl.request_alignment); int max_transfer = MIN_NON_ZERO(bs->bl.max_transfer, MAX_BOUNCE_BUFFER); + bool auto_no_fallback = false; assert(alignment % bs->bl.request_alignment == 0); @@ -1785,6 +1786,16 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, return -ENOMEDIUM; } + if (!(flags & BDRV_REQ_NO_FALLBACK) && + (bs->supported_zero_flags & BDRV_REQ_NO_FALLBACK) && + bs->bl.max_pwrite_zeroes && bs->bl.max_pwrite_zeroes < bytes && + bs->bl.max_pwrite_zeroes < bs->bl.max_pwrite_zeroes_fast) + { + assert(drv->bdrv_co_pwrite_zeroes); + flags |= BDRV_REQ_NO_FALLBACK; + auto_no_fallback = true; + } + if ((flags & ~bs->supported_zero_flags) & BDRV_REQ_NO_FALLBACK) { return -ENOTSUP; } @@ -1829,6 +1840,14 @@ static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs, if (drv->bdrv_co_pwrite_zeroes) { ret = drv->bdrv_co_pwrite_zeroes(bs, offset, num, flags & bs->supported_zero_flags); + if (ret == -ENOTSUP && auto_no_fallback) { + auto_no_fallback = false; + flags &= ~BDRV_REQ_NO_FALLBACK; + max_write_zeroes = + QEMU_ALIGN_DOWN(MIN_NON_ZERO(bs->bl.max_pwrite_zeroes, + INT_MAX), alignment); + continue; + } if (ret != -ENOTSUP && (flags & BDRV_REQ_FUA) && !(bs->supported_zero_flags & BDRV_REQ_FUA)) { need_flush = true;