[RFC,04/12,RESEND] Btrfs: btrfs_discard_extent must use WRITE with btrfs_map_block.

Commit Message

jim owens Jan. 4, 2010, 9:13 p.m. UTC

None

Patch

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;