From: Long Li leo.lilong@huawei.com
Source kernel commit: 652f03db897ba24f9c4b269e254ccc6cc01ff1b7
Compat features are new features that older kernels can safely ignore, allowing read-write mounts without issues. The current sb write validation implementation returns -EFSCORRUPTED for unknown compat features, preventing filesystem write operations and contradicting the feature's definition.
Additionally, if the mounted image is unclean, the log recovery may need to write to the superblock. Returning an error for unknown compat features during sb write validation can cause mount failures.
Although XFS currently does not use compat feature flags, this issue affects current kernels' ability to mount images that may use compat feature flags in the future.
Since superblock read validation already warns about unknown compat features, it's unnecessary to repeat this warning during write validation. Therefore, the relevant code in write validation is being removed.
Fixes: 9e037cb7972f ("xfs: check for unknown v5 feature bits in superblock write verifier") Cc: stable@vger.kernel.org # v4.19+ Signed-off-by: Long Li leo.lilong@huawei.com Reviewed-by: Darrick J. Wong djwong@kernel.org Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Carlos Maiolino cem@kernel.org --- libxfs/xfs_sb.c | 7 ------- 1 file changed, 7 deletions(-)
diff --git a/libxfs/xfs_sb.c b/libxfs/xfs_sb.c index 375324b99261af..87f740e6c75dce 100644 --- a/libxfs/xfs_sb.c +++ b/libxfs/xfs_sb.c @@ -323,13 +323,6 @@ xfs_validate_sb_write( * the kernel cannot support since we checked for unsupported bits in * the read verifier, which means that memory is corrupt. */ - if (xfs_sb_has_compat_feature(sbp, XFS_SB_FEAT_COMPAT_UNKNOWN)) { - xfs_warn(mp, -"Corruption detected in superblock compatible features (0x%x)!", - (sbp->sb_features_compat & XFS_SB_FEAT_COMPAT_UNKNOWN)); - return -EFSCORRUPTED; - } - if (!xfs_is_readonly(mp) && xfs_sb_has_ro_compat_feature(sbp, XFS_SB_FEAT_RO_COMPAT_UNKNOWN)) { xfs_alert(mp,