btrfs: Fix a data space underflow warning
Even with quota disabled, generic/127 will trigger a kernel warning by underflow data space info. The bug is caused by buffered write, which in case of short copy, the start parameter for btrfs_delalloc_release_space() is wrong, and round_up/down() in btrfs_delalloc_release() extents the range to page aligned, decreasing one more page than expected. This patch will fix it by passing correct start. Signed-off-by: NQu Wenruo <quwenruo@cn.fujitsu.com> Signed-off-by: NChris Mason <clm@fb.com>
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