From:   Yangtao Li <frank.li@vivo.com>
To:     xiang@kernel.org, chao@kernel.org, huyue2@coolpad.com,
        jefflexu@linux.alibaba.com, tytso@mit.edu,
        adilger.kernel@dilger.ca, rpeterso@redhat.com, agruenba@redhat.com,
        mark@fasheh.com, jlbec@evilplan.org, joseph.qi@linux.alibaba.com,
        viro@zeniv.linux.org.uk, brauner@kernel.org
Cc:     linux-erofs@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        linux-ext4@vger.kernel.org, cluster-devel@redhat.com,
        ocfs2-devel@oss.oracle.com, linux-fsdevel@vger.kernel.org
Subject: Re: erofs: convert to use i_blockmask()
Date:   Fri, 10 Mar 2023 11:51:21 +0800
Message-Id: <20230310035121.56591-1-frank.li@vivo.com>
In-Reply-To: <20230310031547.GD3390869@ZenIV>
References: <20230310031547.GD3390869@ZenIV>
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
MIME-Version: 1.0
X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1
X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?0WADcUw11cEVwQB7tlEvN01FwCe8pz+KkR1nG5rG39gepYUDdPMgH6337Nqi?=
 =?us-ascii?Q?ShySlqfWOPjzOnU+OzxKBugEl/tGwUNqIaTPqujBXPA4f4I2qPh99WddX26D?=
 =?us-ascii?Q?iUD2f2/N9irt6RUmDBw7HEy/3YOmYy8qFCPGu1FVGzazMdFmMmDRxPYibk+s?=
 =?us-ascii?Q?D6Qo9fll10rHI8bvQ8nh80SYpE99I1doW7LuaEW8WVIyPViCAF3zu5vFeq7m?=
 =?us-ascii?Q?ypecLQKX4BHx3tSTfeTRnV6c3MC0u8Dyii2+FubC7UWcAub36E+dqhz1p+Eo?=
 =?us-ascii?Q?n1Ag3FO4AbH30c/Bqbg+xLlr7hJOw2CuWKK0++T+7Vy5hxrlR1zeB2t6X4LI?=
 =?us-ascii?Q?DLjoPW5n9X12o4OzYjNjmBiXU/kJMNOkNo5NWPgoRdaFC/UWFgUvacpX412E?=
 =?us-ascii?Q?ERHjpS+L2veaTGxnioK4/TtDQ4AAXWZPIYIrvgDRBdqUNwVpt39yp2EaQSvC?=
 =?us-ascii?Q?Xel6P1SFocKvmDDlF1ZWt1bogXm1bEHx2diytGg49kW/SLTNzSAGjct9pHS7?=
 =?us-ascii?Q?wZn3L3vJesvYgrjYueYtBgI7jsO2JFLQgIffKAEP/tfJUElUj3t4i5jUATvc?=
 =?us-ascii?Q?vKVb5bEWVx8jWXzCn+zIPpZRqxvcRll7iBsEaL+aFtzvP/IcjFLcIyiz6tjU?=
 =?us-ascii?Q?wgekBmc6urFZCUi6+b+u86zxaFLSKBovUJQDdbGi0WaDMr/k9kiKyRQ5bG2Z?=
 =?us-ascii?Q?exs6NtrTtqfY6nTN+/3Vevhxt8HvpG1HtIA7Y3Gpz+xRUvOvgeQIqjbaaR1S?=
 =?us-ascii?Q?77pTiIHBA3lzxWtOoOJRkLwcosPNEdacgFmOKLNRdBOU3sQcD2qx68V3kFCA?=
 =?us-ascii?Q?5ceePphUmbDLdMaTDxIBe0yvqOezHJSl65euNCn8saIhUttSom/88r6AXsdj?=
 =?us-ascii?Q?g5GKVRMApUxETrEKg9IZVFUaH8t8Rb/NrrkhAwWuNO6/Pcufa3NPWd2x/Ae5?=
 =?us-ascii?Q?VGQyBGpqBLG6/e0zMICXNDz/NptPOdG9BPwsvHVKbwj71/DjVVTN1WLn0wxp?=
 =?us-ascii?Q?hGTywryF+Sz1jtZZuaVj655dT+S4hHMl8nbOBP5pg8/nJrYWxt0GBtLx3nb0?=
 =?us-ascii?Q?mqMNrpmsjUTBW/cs0L07gL2L+5Lp+Ga5pXm8WxpTXND4X1rwBiQ6pPu2cfaV?=
 =?us-ascii?Q?+GtlHYxEa8CLcbugtXtZkoyjWa1AVHjg05QRgARgy98CFRBkKrCagK+wo+s9?=
 =?us-ascii?Q?5sAcOnVtE0VHXwcvrSskr5XWQ6gjlUFMsUc9zPczqSghcPl3Zqa4Lqhy73v1?=
 =?us-ascii?Q?lfO4K3WbBb0iMWy+EKvHCXNCTvDfuXfXiUp0FxslVW3WemmxVuTEDPGjgTfu?=
 =?us-ascii?Q?GIpRlHGtlWyd+91xcaOuhWtf3OMWFcwkDdrKJPHatrx3HOuyclWVBoOYWH6A?=
 =?us-ascii?Q?uxAt1gkXL0Tt4GeF+G+bRyDxzLSHSu3LgGe0AhBGrB02AU8t9jkL8h036/Wr?=
 =?us-ascii?Q?xmx/m+SYQJpuW76DobC8Rye7QBSfyzI9eqdz7yMBCdmFN+dgbKK7+TQ+IIBl?=
 =?us-ascii?Q?q457BkG7CVIq9D0zD9TwqrBwdhE/4vFmeUXvS2TNim08oj+nHPYQw1y+ke/x?=
 =?us-ascii?Q?uKbQ0MwO72EfRJJoNYS1ohc5liFX/zsrQgUe4p0H?=
X-OriginatorOrg: vivo.com
X-MS-Exchange-CrossTenant-Network-Message-Id: d3135a3c-96d4-47cc-e172-08db211abbaa
X-MS-Exchange-CrossTenant-AuthSource: SEZPR06MB5269.apcprd06.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Mar 2023 03:51:30.6648
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 923e42dc-48d5-4cbe-b582-1a797a6412ed
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: wD7LNWD1QfbA57WzobeXYoht1JD7BJL8fvC29uV4mt8louNa/xM9HOgM0FEH+284m6ANSYRGC/4NV3zf7eZ/jw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: KL1PR0601MB4212
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Hi AI,

> Umm...  What's the branchpoint for that series?
> Not the mainline - there we have i_blocksize() open-coded...

Sorry, I'm based on the latest branch of the erofs repository.

https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git/log/?h=dev-test

I think I can resend based on mainline.

> Umm...  That actually asks for DIV_ROUND_UP(i_size_read_inode(), i_blocksize(inode))
> - compiler should bloody well be able to figure out that division by (1 << n)
> is shift down by n and it's easier to follow that way...

So it seems better to change to DIV_ROUND_UP(i_size_read_inode(), i_blocksize(inode))?

> And the fact that the value will be the same (i.e. that ->i_blkbits is never changed by ocfs2)
> is worth mentioning in commit message...

How about the following msg?

Use i_blockmask() to simplify code. BTW convert ocfs2_is_io_unaligned
to return bool type and the fact that the value will be the same
(i.e. that ->i_blkbits is never changed by ocfs2).


A small question, whether this series of changes will be merged
into each fs branch or all merged into vfs?

Thx,
Yangtao