Btrfs: Add mount -o ssd, which includes optimizations for seek free storage

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 731a534f81f5..5d1f9bca2712 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -193,6 +193,7 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
         }
         eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
         read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
+        btrfs_clear_buffer_defrag(eb);
         found_start = btrfs_header_bytenr(eb);
         if (found_start != start) {
                 printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
@@ -676,6 +677,8 @@ struct btrfs_root *open_ctree(struct super_block *sb)
         fs_info->do_barriers = 1;
         fs_info->closing = 0;
         fs_info->total_pinned = 0;
+        fs_info->last_alloc = 0;
+
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
         INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
 #else