Btrfs: Make an unplug function that doesn't unplug every spindle
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index c829612..7f5aca3 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -913,18 +913,22 @@
void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
{
- struct list_head *cur;
- struct btrfs_device *device;
- struct btrfs_fs_info *info;
+ struct inode *inode = page->mapping->host;
+ struct extent_map_tree *em_tree;
+ struct extent_map *em;
+ u64 offset = page_offset(page);
- info = (struct btrfs_fs_info *)bdi->unplug_io_data;
- list_for_each(cur, &info->fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
- bdi = blk_get_backing_dev_info(device->bdev);
- if (bdi->unplug_io_fn) {
- bdi->unplug_io_fn(bdi, page);
- }
- }
+ em_tree = &BTRFS_I(inode)->extent_tree;
+ spin_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
+ spin_unlock(&em_tree->lock);
+ if (!em)
+ return;
+
+ offset = offset - em->start;
+ btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
+ em->block_start + offset, page);
+ free_extent_map(em);
}
static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
