Re: [PATCH v4] xfs: Check for delayed allocations before setting extsize

[Ojaswin Mujoo]

On Tue, Oct 15, 2024 at 03:15:09PM +0530, Ojaswin Mujoo wrote:
> Extsize should only be allowed to be set on files with no data in it.
> For this, we check if the files have extents but miss to check if
> delayed extents are present. This patch adds that check.
> 
> While we are at it, also refactor this check into a helper since
> it's used in some other places as well like xfs_inactive() or
> xfs_ioctl_setattr_xflags()
> 
> **Without the patch (SUCCEEDS)**
> 
> $ xfs_io -c 'open -f testfile' -c 'pwrite 0 1024' -c 'extsize 65536'
> 
> wrote 1024/1024 bytes at offset 0
> 1 KiB, 1 ops; 0.0002 sec (4.628 MiB/sec and 4739.3365 ops/sec)
> 
> **With the patch (FAILS as expected)**
> 
> $ xfs_io -c 'open -f testfile' -c 'pwrite 0 1024' -c 'extsize 65536'
> 
> wrote 1024/1024 bytes at offset 0
> 1 KiB, 1 ops; 0.0002 sec (4.628 MiB/sec and 4739.3365 ops/sec)
> xfs_io: FS_IOC_FSSETXATTR testfile: Invalid argument
> 
> Fixes: e94af02a9cd7 ("[XFS] fix old xfs_setattr mis-merge from irix; mostly harmless esp if not using xfs rt")
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>
> Signed-off-by: Ojaswin Mujoo <ojaswin@xxxxxxxxxxxxx>
> ---
> 

The initial set of tests have been posted by Nirjhar here:
https://lore.kernel.org/fstests/cover.1729624806.git.nirjhar@xxxxxxxxxxxxx/T/#t

Regards,
ojaswin