Re: [PATCH 6.1 03/16] xfs: remove a racy if_bytes check in xfs_reflink_end_cow_extent

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

✅ All tests passed successfully. No issues detected.
No action required from the submitter.

The upstream commit SHA1 provided is correct: 86de848403abda05bf9c16dcdb6bef65a8d88c41

WARNING: Author mismatch between patch and upstream commit:
Backport author: Leah Rumancik<leah.rumancik@gmail.com>
Commit author: Christoph Hellwig<hch@lst.de>

Status in newer kernel trees:
6.14.y | Present (exact SHA1)
6.12.y | Present (exact SHA1)
6.6.y | Present (different SHA1: c299188b443a)

Note: The patch differs from the upstream commit:
---
1:  86de848403abd ! 1:  17fd2403176bf xfs: remove a racy if_bytes check in xfs_reflink_end_cow_extent
    @@ Metadata
      ## Commit message ##
         xfs: remove a racy if_bytes check in xfs_reflink_end_cow_extent
     
    +    [ Upstream commit 86de848403abda05bf9c16dcdb6bef65a8d88c41 ]
    +
         Accessing if_bytes without the ilock is racy.  Remove the initial
         if_bytes == 0 check in xfs_reflink_end_cow_extent and let
         ext_iext_lookup_extent fail for this case after we've taken the ilock.
    @@ Commit message
         Signed-off-by: Christoph Hellwig <hch@lst.de>
         Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
         Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
    +    Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com>
    +    Acked-by: "Darrick J. Wong" <djwong@kernel.org>
     
      ## fs/xfs/xfs_reflink.c ##
     @@ fs/xfs/xfs_reflink.c: xfs_reflink_end_cow_extent(
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.6.y        |  Success    |  Success   |