WRITE is needed on btrfs_map_block() to fetch all raid stripes,
READ only returns one device and we want to discard all copies.
Signed-off-by: jim owens <jow...@hp.com>
---
fs/btrfs/extent-tree.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index b610557..185d273 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1594,7 +1594,7 @@ static int btrfs_discard_extent(struct btrfs_root *root,
u64 bytenr,
return 0;
/* 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;
--
1.5.6.3
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