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Btrfs: Do not limit RAID1 and DUP transfer length to one stripe.

RFC PATCH In review jim owens 1 participant 1 message Jan 4, 2010 Btrfs file system

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jim owens

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RFC PATCH 1/12 Btrfs: Do not limit RAID1 and DUP transfer length to one stripe.

The 65k stripe length should be ignored as the stripes are physically contiguous on disk so transfers can span stripes.

Signed-off-by jim owens <[email protected]>
---
 fs/btrfs/volumes.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
fs/btrfs/volumes.c +3 -3
index 198cff2..f4b5666 100644
@@ -2697,13 +2697,13 @@ again:
 	/* stripe_offset is the offset of this block in its stripe*/
 	stripe_offset = offset - stripe_offset;
 
-	if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
-			 BTRFS_BLOCK_GROUP_RAID10 |
-			 BTRFS_BLOCK_GROUP_DUP)) {
+	if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
+			 BTRFS_BLOCK_GROUP_RAID10)) {
 		/* we limit the length of each bio to what fits in a stripe */
 		*length = min_t(u64, em->len - offset,
 			      map->stripe_len - stripe_offset);
 	} else {
+		/* RAID1, DUP, and simple disk stripes are all contiguous */
 		*length = em->len - offset;
 	}
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