xfs: Check for extent overflow when moving extent from cow to data fork
mainline inclusion from mainline-v5.12-rc1 commit 5f1d5bbf category: bugfix bugzilla: 187510,https://gitee.com/openeuler/kernel/issues/I4KIAO Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5f1d5bbfb2e674052a9fe542f53678978af20770 -------------------------------- Moving an extent to data fork can cause a sub-interval of an existing extent to be unmapped. This will increase extent count by 1. Mapping in the new extent can increase the extent count by 1 again i.e. | Old extent | New extent | Old extent | Hence number of extents increases by 2. Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NAllison Henderson <allison.henderson@oracle.com> Signed-off-by: NChandan Babu R <chandanrlinux@gmail.com> Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Signed-off-by: NYu Kuai <yukuai3@huawei.com> Signed-off-by: NGuo Xuenan <guoxuenan@huawei.com> Reviewed-by: NZhang Yi <yi.zhang@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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