In btrfs_discard_extent() we were only discarding half of a RAID1 or
RAID10 extent.
We should be telling btrfs_map_block() that we want to write, so it
tells us about _all_ mirrors. If we tell it we're going to read, it'll
only tell us about a single mirror at a time.
Signed-off-by: David Woodhouse <David.Woodhouse@xxxxxxxxx>
---
Untested. Does anyone have any real devices that do TRIM yet, or do I
need to hack up an FTL to do it again?
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index a5aca39..1496925 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1421,7 +1421,7 @@ static int btrfs_discard_extent(struct btrfs_root
*root, u64 bytenr,
struct btrfs_multi_bio *multi = NULL;
/* Tell the block device(s) that the sectors can be discarded */
- ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
+ ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
bytenr, &map_length, &multi, 0);
if (!ret) {
struct btrfs_bio_stripe *stripe = multi->stripes;
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@xxxxxxxxx Intel Corporation
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