From patchwork Mon Jan 6 15:19:38 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 13927583 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7A1301474A0; Mon, 6 Jan 2025 15:19:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.95.11.211 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736176785; cv=none; b=IiAnx9lnt272SBtMlk91rVLCwXuQAKk8E1DcoNa3NvJ3QdKaN/M8lTjf1zWbT16hcFQXCRpgF/eNAzr8q3hRGBw6KOOQbrqwhbxqpA0gwaBEvP03kXpR4NRwr0olEScrItdweVNyTXy4hLml3V0O3sKQ3SdCVJDZt0v/6YvpRHI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736176785; c=relaxed/simple; bh=8zrCXLf6X5v1dVcJogjOZPO6npUy+5xRwpbRzC49N90=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=Qyql2XY532r4GiYEc2oagyexbdiFWV1xzVhT2mES/JJHh/WyPluuAi3zFxqi/tvJvlHCZsi/DeeyGzzZ4eOI4ITWv0TGM91woSKw9CIrZNaKRhfABPlLpIiZrFlgiSEuw29E4CtrTp2QMN8/RIIVBTSKHTqW/kLGZI/TRMErQb8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de; spf=pass smtp.mailfrom=lst.de; arc=none smtp.client-ip=213.95.11.211 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=lst.de Received: by verein.lst.de (Postfix, from userid 2407) id D493468C7B; Mon, 6 Jan 2025 16:19:38 +0100 (CET) Date: Mon, 6 Jan 2025 16:19:38 +0100 From: Christoph Hellwig To: Alexander Viro , Christian Brauner Cc: Jan Kara , Chandan Babu R , "Darrick J. Wong" , Hongbo Li , Ryusuke Konishi , linux-nilfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-man@vger.kernel.org Subject: [PATCH] statx.2: document STATX_DIO_READ_ALIGN Message-ID: <20250106151938.GA27324@lst.de> References: <20250106151607.954940-1-hch@lst.de> Precedence: bulk X-Mailing-List: linux-xfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20250106151607.954940-1-hch@lst.de> User-Agent: Mutt/1.5.17 (2007-11-01) Document the new STATX_DIO_READ_ALIGN flag and the new stx_dio_read_offset_align field guarded by it. Signed-off-by: Christoph Hellwig Reviewed-by: "Darrick J. Wong" --- man/man2/statx.2 | 27 ++++++++++++++++++++++++++- 1 file changed, 26 insertions(+), 1 deletion(-) diff --git a/man/man2/statx.2 b/man/man2/statx.2 index c5b5a28ec2f1..378bf363d93f 100644 --- a/man/man2/statx.2 +++ b/man/man2/statx.2 @@ -76,6 +76,9 @@ struct statx { __u32 stx_atomic_write_unit_min; __u32 stx_atomic_write_unit_max; __u32 stx_atomic_write_segments_max; + + /* File offset alignment for direct I/O reads */ + __u32 stx_dio_read_offset_align; }; .EE .in @@ -261,7 +264,7 @@ STATX_BTIME Want stx_btime STATX_ALL The same as STATX_BASIC_STATS | STATX_BTIME. It is deprecated and should not be used. STATX_MNT_ID Want stx_mnt_id (since Linux 5.8) -STATX_DIOALIGN Want stx_dio_mem_align and stx_dio_offset_align +STATX_DIOALIGN Want stx_dio_mem_align and stx_dio_offset_align. (since Linux 6.1; support varies by filesystem) STATX_MNT_ID_UNIQUE Want unique stx_mnt_id (since Linux 6.8) STATX_SUBVOL Want stx_subvol @@ -270,6 +273,8 @@ STATX_WRITE_ATOMIC Want stx_atomic_write_unit_min, stx_atomic_write_unit_max, and stx_atomic_write_segments_max. (since Linux 6.11; support varies by filesystem) +STATX_DIO_READ_ALIGN Want stx_dio_read_offset_align. + (since Linux 6.14; support varies by filesystem) .TE .in .P @@ -467,6 +472,26 @@ This will only be nonzero if .I stx_dio_mem_align is nonzero, and vice versa. .TP +.I stx_dio_read_offset_align +The alignment (in bytes) required for file offsets and I/O segment lengths for +direct I/O reads +.RB ( O_DIRECT ) +on this file. If zero the limit in +.I +stx_dio_offset_align +applies for reads as well. If non-zero this value must be +smaller than +.I +stx_dio_offset_align +which must be provided by the file system. +This value does not affect the memory alignent in +.I stx_dio_mem_align . +.IP +.B STATX_DIO_READ_ALIGN +.I ( stx_dio_offset_align ) +support by filesystem; +it is supported by xfs since Linux 6.14. +.TP .I stx_subvol Subvolume number of the current file. .IP