btrfs: reinitialize scrub workers

Scrub starts the workers each time a scrub starts and stops them after it
finished. This patch adds an initialization for the workers before each
start, otherwise the workers behave strangely.

Signed-off-by: Arne Jansen <sensille@gmx.net>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index a203d36..7bbbfeb 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1668,8 +1668,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
        init_waitqueue_head(&fs_info->scrub_pause_wait);
        init_rwsem(&fs_info->scrub_super_lock);
        fs_info->scrub_workers_refcnt = 0;
-       btrfs_init_workers(&fs_info->scrub_workers, "scrub",
-                          fs_info->thread_pool_size, &fs_info->generic_worker);
 
        sb->s_blocksize = 4096;
        sb->s_blocksize_bits = blksize_bits(4096);

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index d5a4108..92cac19 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1166,8 +1166,12 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_root *root)
        struct btrfs_fs_info *fs_info = root->fs_info;
 
        mutex_lock(&fs_info->scrub_lock);
-       if (fs_info->scrub_workers_refcnt == 0)
+       if (fs_info->scrub_workers_refcnt == 0) {
+               btrfs_init_workers(&fs_info->scrub_workers, "scrub",
+                          fs_info->thread_pool_size, &fs_info->generic_worker);
+               fs_info->scrub_workers.idle_thresh = 4;
                btrfs_start_workers(&fs_info->scrub_workers, 1);
+       }
        ++fs_info->scrub_workers_refcnt;
        mutex_unlock(&fs_info->scrub_lock);