diff options
| author | Christoph Hellwig <hch@lst.de> | 2009-10-14 09:24:59 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2009-10-14 10:32:49 -0400 |
| commit | e244a0aeb6a599c19a7c802cda6e2d67c847b154 (patch) | |
| tree | 392d8d48c4e6676a552230135ad448d522007ece /fs/btrfs/extent-tree.c | |
| parent | 86df7eb921a009515285e7171363fa57dd2d7d31 (diff) | |
| download | linux-e244a0aeb6a599c19a7c802cda6e2d67c847b154.tar.gz linux-e244a0aeb6a599c19a7c802cda6e2d67c847b154.tar.bz2 linux-e244a0aeb6a599c19a7c802cda6e2d67c847b154.zip | |
Btrfs: add -o discard option
Enable discard by default is not a good idea given the the trim speed
of SSD prototypes we've seen, and the carecteristics for many high-end
arrays. Turn of discards by default and require the -o discard option
to enable them on.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/extent-tree.c')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 4aedbff36b8f..bf7782fc5939 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1584,6 +1584,9 @@ static int btrfs_discard_extent(struct btrfs_root *root, u64 bytenr, u64 map_length = num_bytes; struct btrfs_multi_bio *multi = NULL; + if (!btrfs_test_opt(root, DISCARD)) + return 0; + /* Tell the block device(s) that the sectors can be discarded */ ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, bytenr, &map_length, &multi, 0); |