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@xxxxxx>
Index: linux-2.6/fs/btrfs/extent-tree.c
===================================================================
--- linux-2.6.orig/fs/btrfs/extent-tree.c 2009-10-07 11:04:18.451256181 -0400
+++ linux-2.6/fs/btrfs/extent-tree.c 2009-10-07 11:04:26.225005458 -0400
@@ -1568,19 +1568,16 @@ static int remove_extent_backref(struct
return ret;
}
-#ifdef BIO_RW_DISCARD
static void btrfs_issue_discard(struct block_device *bdev,
u64 start, u64 len)
{
blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL,
DISCARD_FL_BARRIER);
}
-#endif
static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
-#ifdef BIO_RW_DISCARD
int ret;
u64 map_length = num_bytes;
struct btrfs_multi_bio *multi = NULL;
@@ -1604,9 +1601,6 @@ static int btrfs_discard_extent(struct b
}
return ret;
-#else
- return 0;
-#endif
}
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
--
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