---

yaml --- r: 128778 b: refs/heads/master c: cb03c74 h: refs/heads/master v: v3
git-mirror · Sep 25, 2008 · d2bc7af · d2bc7af
1 parent c8b4816
commit d2bc7af
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Showing 3 changed files with 11 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 211c17f51f46dc6c308c742098273dd46b5ca59c
+refs/heads/master: cb03c743c6486e4efb8be6bdf7bf23177826d156
diff --git a/trunk/fs/btrfs/ctree.h b/trunk/fs/btrfs/ctree.h
@@ -522,6 +522,7 @@ struct btrfs_fs_info {
 	struct work_struct async_submit_work;
 	spinlock_t end_io_work_lock;
 	spinlock_t async_submit_work_lock;
+	atomic_t nr_async_submits;
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
 	struct work_struct trans_work;

diff --git a/trunk/fs/btrfs/disk-io.c b/trunk/fs/btrfs/disk-io.c
@@ -453,6 +453,7 @@ int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
 
 	spin_lock(&fs_info->async_submit_work_lock);
 	list_add_tail(&async->list, &fs_info->async_submit_work_list);
+	atomic_inc(&fs_info->nr_async_submits);
 	spin_unlock(&fs_info->async_submit_work_lock);
 
 	queue_work(async_submit_workqueue, &fs_info->async_submit_work);
@@ -906,10 +907,16 @@ static int btrfs_congested_fn(void *congested_data, int bdi_bits)
 {
 	struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
 	int ret = 0;
+	int limit = 256 * info->fs_devices->open_devices;
 	struct list_head *cur;
 	struct btrfs_device *device;
 	struct backing_dev_info *bdi;
 
+	if ((bdi_bits & (1 << BDI_write_congested)) &&
+	    atomic_read(&info->nr_async_submits) > limit) {
+		return 1;
+	}
+
 	list_for_each(cur, &info->fs_devices->devices) {
 		device = list_entry(cur, struct btrfs_device, dev_list);
 		if (!device->bdev)
@@ -1117,6 +1124,7 @@ static void btrfs_async_submit_work(struct work_struct *work)
 		}
 		next = fs_info->async_submit_work_list.next;
 		list_del(next);
+		atomic_dec(&fs_info->nr_async_submits);
 		spin_unlock(&fs_info->async_submit_work_lock);
 
 		async = list_entry(next, struct async_submit_bio, list);
@@ -1179,6 +1187,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
 	INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 	INIT_LIST_HEAD(&fs_info->space_info);
 	btrfs_mapping_init(&fs_info->mapping_tree);
+	atomic_set(&fs_info->nr_async_submits, 0);
 	fs_info->sb = sb;
 	fs_info->max_extent = (u64)-1;
 	fs_info->max_inline = 8192 * 1024;