Btrfs: enable discard support
The discard support code in btrfs currently is guarded by ifdefs for BIO_RW_DISCARD, which is never defines as it's the name of an enum memeber. Just remove the useless ifdefs to actually enable the code. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -1568,18 +1568,15 @@ static int remove_extent_backref(struct btrfs_trans_handle *trans,
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return ret;
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}
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#ifdef BIO_RW_DISCARD
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static void btrfs_issue_discard(struct block_device *bdev,
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u64 start, u64 len)
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{
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blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL);
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}
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#endif
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static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
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u64 num_bytes)
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{
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#ifdef BIO_RW_DISCARD
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int ret;
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u64 map_length = num_bytes;
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struct btrfs_multi_bio *multi = NULL;
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@ -1606,9 +1603,6 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
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}
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return ret;
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#else
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return 0;
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#endif
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}
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int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
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