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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1759846685; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JqmAxJcwf6pRKKSUnF4GWDas5WBlnsLAsYEj/OIjsBc=; b=BFZfmd/G6DTZvG0jdb3KuXxTNHr/JsJcISD5Rcum8jyHq2GeRBp9b2D0sqNa5mmCFCPlr3 cT3ojl1NVUoikdPayegKPqK0/+PobCSOISY8vJoG+zB3kFGOmHa3+4EdTXfBj8dG2LPRRs OsxfNacgob+TlaqRQgz9hOrEjZjVO/M= X-MC-Unique: jDjr9vXGNaS-CNTpPZW39w-1 X-Mimecast-MFC-AGG-ID: jDjr9vXGNaS-CNTpPZW39w_1759846683 From: Stefan Hajnoczi To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, Kevin Wolf , Jean-Louis Dupond , Vladimir Sementsov-Ogievskiy , Hanna Reitz , Stefan Hajnoczi Subject: [PATCH v2 1/3] file-posix: populate pwrite_zeroes_alignment Date: Tue, 7 Oct 2025 10:16:58 -0400 Message-ID: <20251007141700.71891-2-stefanha@redhat.com> In-Reply-To: <20251007141700.71891-1-stefanha@redhat.com> References: <20251007141700.71891-1-stefanha@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" Linux block devices require write zeroes alignment whereas files do not. It may come as a surprise that block devices opened in buffered I/O mode require the alignment for write zeroes requests although normal read/write requests do not. Therefore it is necessary to populate the pwrite_zeroes_alignment field. Signed-off-by: Stefan Hajnoczi Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/file-posix.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/block/file-posix.c b/block/file-posix.c index 8c738674ce..827ffa77a5 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1602,6 +1602,22 @@ static void raw_refresh_limits(BlockDriverState *bs,= Error **errp) =20 bs->bl.pdiscard_alignment =3D dalign; } + +#ifdef __linux__ + /* + * Linux requires logical block size alignment for write zeroes ev= en + * when normal reads/writes do not require alignment. + */ + if (!s->needs_alignment) { + ret =3D probe_logical_blocksize(s->fd, + &bs->bl.pwrite_zeroes_alignment); + if (ret < 0) { + error_setg_errno(errp, -ret, + "Failed to probe logical block size"); + return; + } + } +#endif /* __linux__ */ } =20 raw_refresh_zoned_limits(bs, &st, errp); --=20 2.51.0