Re: [PATCH] xfs: new EOF fragmentation tests

[Zorro Lang <zlang@redhat.com>]

On Mon, Oct 14, 2024 at 08:24:28AM -0700, Darrick J. Wong wrote:
> On Mon, Oct 14, 2024 at 08:07:25AM +0200, Christoph Hellwig wrote:
> > On Mon, Oct 14, 2024 at 01:49:36AM +0800, Zorro Lang wrote:
> > > Thanks for reworking this patch, it's been merged into fstests, named
> > > xfs/629~632. But now these 4 cases always fail on upstream xfs, e.g
> > > (diff output) [1][2][3][4]. Could you help to take a look at the
> > > failure which Darick metioned above too :)
> > 
> > What do you mean with upstream xfs?  Any kernel before the eofblocks
> > fixes will obviously fail.  Always_cow will also always fail and I'll
> > send a patch for that.  Any other configuration you've seen?
> 
> fsdax, any config with an extent size hint set, and any time
> sb_rextsize > 1 fsblock.

Even with dax=never, it's still reproducible. There's not any special config
about the extent size hint. The mkfs.xfs option is:
"-b size=4096 -m crc=1,finobt=1,rmapbt=0,reflink=0,inobtcount=1,bigtime=1"

The mkfs output is:
meta-data=/dev/pmem0             isize=512    agcount=4, agsize=655360 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=1        finobt=1, sparse=1, rmapbt=0
         =                       reflink=0    bigtime=1 inobtcount=1 nrext64=1
         =                       exchange=0  
data     =                       bsize=4096   blocks=2621440, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0, ftype=1, parent=0
log      =internal log           bsize=4096   blocks=300954, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

From the output we can see the sector size is 4096.
The mount option is "-o dax=always/inode/never", no more, without external
log device, no rtdev.

Thanks,
Zorro

> 
> --D
>