btrfs: reada: bypass adding extent when all zone failed

When failed adding all dev_zones for a reada_extent, the extent
will have no chance to be selected to run, and keep in memory
for ever.

We should bypass this extent to avoid above case.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 27a2fe9..1d00de7 100644 (file)
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -330,6 +330,7 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
        int nzones = 0;
        unsigned long index = logical >> PAGE_CACHE_SHIFT;
        int dev_replace_is_ongoing;
+       int have_zone = 0;
 
        spin_lock(&fs_info->reada_lock);
        re = radix_tree_lookup(&fs_info->reada_tree, index);
@@ -456,10 +457,14 @@ static struct reada_extent *reada_find_extent(struct btrfs_root *root,
                        btrfs_dev_replace_unlock(&fs_info->dev_replace);
                        goto error;
                }
+               have_zone = 1;
        }
        spin_unlock(&fs_info->reada_lock);
        btrfs_dev_replace_unlock(&fs_info->dev_replace);
 
+       if (!have_zone)
+               goto error;
+
        btrfs_put_bbio(bbio);
        return re;