On 07/20/2016 01:56 AM, Wang Xiaoguang wrote:
In next patch, btrfs_clear_bit_hook() will not call
btrfs_free_reserved_data_space_noquota() to update btrfs_space_info's
bytes_may_use unless it has EXTENT_DO_ACCOUNTING or EXTENT_CLEAR_DATA_RESV,
as for the reason, please see the next patch for detailed info.
As we know, usually EXTENT_DO_ACCOUNTING is used for error path. In
run_delalloc_nocow(), for inode marked as NODATACOW or extent marked as
PREALLOC, we also need to update bytes_may_use, but can not pass
EXTENT_DO_ACCOUNTING, because it also clears metadata reservation, so here
we introduce EXTENT_CLEAR_DATA_RESV flag to indicate btrfs_clear_bit_hook()
to update btrfs_space_info's bytes_may_use.
Signed-off-by: Wang Xiaoguang <wangxg.f...@cn.fujitsu.com>
There's no point in introducing only a flag in one patch, collapse this into the
patch that actually uses it. Thanks,
Josef
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