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btrfs: always pass readahead state to defrag
Defrag ioctl passes readahead from the file, but autodefrag does not have a file so the readahead state is allocated when needed. The autodefrag loop in cleaner thread iterates over inodes so we can simply provide an on-stack readahead state and will not need to allocate it in btrfs_defrag_file(). The size is 32 bytes which is acceptable. Reviewed-by: Qu Wenruo <[email protected]> Signed-off-by: David Sterba <[email protected]>
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