linux-ext4 - Re: erofs: convert to use i

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Date:   Fri, 10 Mar 2023 11:51:21 +0800
From:   Yangtao Li <frank.li@...o.com>
To:     xiang@...nel.org, chao@...nel.org, huyue2@...lpad.com,
        jefflexu@...ux.alibaba.com, tytso@....edu,
        adilger.kernel@...ger.ca, rpeterso@...hat.com, agruenba@...hat.com,
        mark@...heh.com, jlbec@...lplan.org, joseph.qi@...ux.alibaba.com,
        viro@...iv.linux.org.uk, brauner@...nel.org
Cc:     linux-erofs@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com,
        ocfs2-devel@....oracle.com, linux-fsdevel@...r.kernel.org
Subject: Re: erofs: convert to use i_blockmask()

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