xfs: reserve quota inode transaction space only when needed
We share an inode between gquota and pquota with the older superblock that doesn't have separate pquotino, and for the need_alloc == false case we don't need to call xfs_dir_ialloc() function, so add the check if reserved free disk blocks is needed. Signed-off-by: NKaixu Xia <kaixuxia@tencent.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NEric Sandeen <sandeen@redhat.com> Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>
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