linux-kernel - Re: NVFS XFS metadata (was: [PATCH] pmem: export the symbols __copy_user_flushcache and __copy_from_user

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Date:   Mon, 28 Sep 2020 11:22:28 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
cc:     Dave Chinner <david@...morbit.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Eric Sandeen <esandeen@...hat.com>,
        Dave Chinner <dchinner@...hat.com>,
        "Kani, Toshi" <toshi.kani@....com>,
        "Norton, Scott J" <scott.norton@....com>,
        "Tadakamadla, Rajesh (DCIG/CDI/HPS Perf)" 
        <rajesh.tadakamadla@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: NVFS XFS metadata (was: [PATCH] pmem: export the symbols
 __copy_user_flushcache and __copy_from_user_flushcache)



On Thu, 24 Sep 2020, Mikulas Patocka wrote:

> On Tue, 22 Sep 2020, Matthew Wilcox wrote:
> 
> > > There is a small window when renamed inode is neither in source nor in 
> > > target directory. Fsck will reclaim such inode and add it to lost+found - 
> > > just like on EXT2.
> > 
> > ... ouch.  If you have to choose, it'd be better to link it to the second
> > directory then unlink it from the first one.  Then your fsck can detect
> > it has the wrong count and fix up the count (ie link it into both
> > directories rather than neither).
> 
> I admit that this is lame and I'll fix it. Rename is not so 
> performance-critical, so I can add a small journal for this.

Hi

I have implmemented transactions in nvfs and I use them for rename, 
setattr, atomic xattr replacement and for RENAME_EXCHANGE.

You can download the current version here:
git://leontynka.twibright.com/nvfs.git

Mikulas