Btrfs: btrfs_discard_extent must use WRITE with btrfs_map_block.

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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2010-01-04 21:13 UTC #0 lore raw

RFC PATCH 4/12 Btrfs: btrfs_discard_extent must use WRITE with btrfs_map_block.

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 <[email protected]>

---
 fs/btrfs/extent-tree.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

fs/btrfs/extent-tree.c +1 -1

index b610557..185d273 100644
@@ -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;

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1.5.6.3