linux-kernel - Re: Linux 5.16-rc1

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Message-ID: <CAHk-=wgvzH=BaFg+kiWk1DXGLNELSmPS2VWcgSSmW5Y6vz-v_A@mail.gmail.com>
Date:   Wed, 17 Nov 2021 16:28:42 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Anton Altaparmakov <anton@...era.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Guenter Roeck <linux@...ck-us.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "linux-ntfs-dev@...ts.sourceforge.net" 
        <linux-ntfs-dev@...ts.sourceforge.net>
Subject: Re: Linux 5.16-rc1

On Wed, Nov 17, 2021 at 3:29 PM Anton Altaparmakov <anton@...era.com> wrote:
>
> What we need here is an array to store pointers to in-memory inodes that correspond to inodes in the inode table page being written out.

Do we actually need the array?

The ntfs_inode pointers in that array are always locked (using
'mrec_lock'), so ti could be just a linked list of entries.

Yeah, that would require adding a 'next' pointer to 'struct
_ntfs_inode', but maybe that would be the right thing to do?

I don't know the code, but it looks to me like it's literally just a
stack of locked ntfs_inode pointers - where the lock is taken before
adding it to the stack, and released after taking it off the stack. So
a singly-linked list would seem to be a very simple implementation.

                      Linus