btrfs: Replace fs_info->readahead_workers workqueue with btrfs_workqueue.

Replace the fs_info->readahead_workers with the newly created
btrfs_workqueue.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Tested-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Josef Bacik <jbacik@fb.com>

4 files changed, 11 insertions, 14 deletions

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index e5c94cbaa3fa..b5f2a19177e8 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1517,7 +1517,7 @@ struct btrfs_fs_info {
         struct btrfs_workqueue_struct *endio_freespace_worker;
         struct btrfs_workqueue_struct *submit_workers;
         struct btrfs_workqueue_struct *caching_workers;
-        struct btrfs_workers readahead_workers;
+        struct btrfs_workqueue_struct *readahead_workers;
 
         /*
          * fixup workers take dirty pages that didn't properly go through
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9c14e3bd078c..c0b003bb66cd 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2008,7 +2008,7 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
         btrfs_destroy_workqueue(fs_info->submit_workers);
         btrfs_stop_workers(&fs_info->delayed_workers);
         btrfs_destroy_workqueue(fs_info->caching_workers);
-        btrfs_stop_workers(&fs_info->readahead_workers);
+        btrfs_destroy_workqueue(fs_info->readahead_workers);
         btrfs_destroy_workqueue(fs_info->flush_workers);
         btrfs_stop_workers(&fs_info->qgroup_rescan_workers);
 }
@@ -2522,14 +2522,11 @@ int open_ctree(struct super_block *sb,
         btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta",
                            fs_info->thread_pool_size,
                            &fs_info->generic_worker);
-        btrfs_init_workers(&fs_info->readahead_workers, "readahead",
-                           fs_info->thread_pool_size,
-                           &fs_info->generic_worker);
+        fs_info->readahead_workers =
+                btrfs_alloc_workqueue("readahead", flags, max_active, 2);
         btrfs_init_workers(&fs_info->qgroup_rescan_workers, "qgroup-rescan", 1,
                            &fs_info->generic_worker);
 
-        fs_info->readahead_workers.idle_thresh = 2;
-
         /*
          * btrfs_start_workers can really only fail because of ENOMEM so just
          * return -ENOMEM if any of these fail.
@@ -2537,7 +2534,6 @@ int open_ctree(struct super_block *sb,
         ret = btrfs_start_workers(&fs_info->generic_worker);
         ret |= btrfs_start_workers(&fs_info->fixup_workers);
         ret |= btrfs_start_workers(&fs_info->delayed_workers);
-        ret |= btrfs_start_workers(&fs_info->readahead_workers);
         ret |= btrfs_start_workers(&fs_info->qgroup_rescan_workers);
         if (ret) {
                 err = -ENOMEM;
@@ -2549,7 +2545,7 @@ int open_ctree(struct super_block *sb,
               fs_info->endio_meta_write_workers &&
               fs_info->endio_write_workers && fs_info->endio_raid56_workers &&
               fs_info->endio_freespace_worker && fs_info->rmw_workers &&
-              fs_info->caching_workers)) {
+              fs_info->caching_workers && fs_info->readahead_workers)) {
                 err = -ENOMEM;
                 goto fail_sb_buffer;
         }
diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index 31c797c48c3e..9e01d3677355 100644
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -91,7 +91,8 @@ struct reada_zone {
 };
 
 struct reada_machine_work {
-        struct btrfs_work       work;
+        struct btrfs_work_struct
+                                work;
         struct btrfs_fs_info    *fs_info;
 };
 
@@ -733,7 +734,7 @@ static int reada_start_machine_dev(struct btrfs_fs_info *fs_info,
 
 }
 
-static void reada_start_machine_worker(struct btrfs_work *work)
+static void reada_start_machine_worker(struct btrfs_work_struct *work)
 {
         struct reada_machine_work *rmw;
         struct btrfs_fs_info *fs_info;
@@ -793,10 +794,10 @@ static void reada_start_machine(struct btrfs_fs_info *fs_info)
                 /* FIXME we cannot handle this properly right now */
                 BUG();
         }
-        rmw->work.func = reada_start_machine_worker;
+        btrfs_init_work(&rmw->work, reada_start_machine_worker, NULL, NULL);
         rmw->fs_info = fs_info;
 
-        btrfs_queue_worker(&fs_info->readahead_workers, &rmw->work);
+        btrfs_queue_work(fs_info->readahead_workers, &rmw->work);
 }
 
 #ifdef DEBUG
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index b84fbe04f05a..ce9d012a77e8 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1336,7 +1336,7 @@ static void btrfs_resize_thread_pool(struct btrfs_fs_info *fs_info,
         btrfs_workqueue_set_max(fs_info->endio_write_workers, new_pool_size);
         btrfs_workqueue_set_max(fs_info->endio_freespace_worker, new_pool_size);
         btrfs_set_max_workers(&fs_info->delayed_workers, new_pool_size);
-        btrfs_set_max_workers(&fs_info->readahead_workers, new_pool_size);
+        btrfs_workqueue_set_max(fs_info->readahead_workers, new_pool_size);
         btrfs_set_max_workers(&fs_info->scrub_wr_completion_workers,
                               new_pool_size);
 }