[PATCH 04/12] btrfs: unify compression ops with workspace_manager

[Dennis Zhou]

Make the workspace_manager own the interface operations rather than
managing index-paired arrays for the workspace_manager and compression
operations.

Signed-off-by: Dennis Zhou <den...@kernel.org>
Reviewed-by: Nikolay Borisov <nbori...@suse.com>
Reviewed-by: Josef Bacik <jo...@toxicpanda.com>
---
 fs/btrfs/compression.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index 5b508cb3b236..ef560b47b9c5 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -775,6 +775,7 @@ const struct btrfs_compress_op btrfs_heuristic_compress = {
 };
 
 struct workspace_manager {
+       const struct btrfs_compress_op *ops;
        struct list_head idle_ws;
        spinlock_t ws_lock;
        /* Number of free workspaces */
@@ -800,6 +801,8 @@ void __init btrfs_init_compress(void)
        int i;
 
        for (i = 0; i < BTRFS_NR_WORKSPACE_MANAGERS; i++) {
+               wsm[i].ops = btrfs_compress_op[i];
+
                INIT_LIST_HEAD(&wsm[i].idle_ws);
                spin_lock_init(&wsm[i].ws_lock);
                atomic_set(&wsm[i].total_ws, 0);
@@ -809,7 +812,7 @@ void __init btrfs_init_compress(void)
                 * Preallocate one workspace for each compression type so
                 * we can guarantee forward progress in the worst case
                 */
-               workspace = btrfs_compress_op[i]->alloc_workspace();
+               workspace = wsm[i].ops->alloc_workspace();
                if (IS_ERR(workspace)) {
                        pr_warn("BTRFS: cannot preallocate compression 
workspace, will try later\n");
                } else {
@@ -872,7 +875,7 @@ static struct list_head *find_workspace(int type)
         * context of btrfs_compress_bio/btrfs_compress_pages
         */
        nofs_flag = memalloc_nofs_save();
-       workspace = btrfs_compress_op[type]->alloc_workspace();
+       workspace = wsm[type].ops->alloc_workspace();
        memalloc_nofs_restore(nofs_flag);
 
        if (IS_ERR(workspace)) {
@@ -930,7 +933,7 @@ static void free_workspace(int type, struct list_head 
*workspace)
        }
        spin_unlock(ws_lock);
 
-       btrfs_compress_op[type]->free_workspace(workspace);
+       wsm[type].ops->free_workspace(workspace);
        atomic_dec(total_ws);
 wake:
        cond_wake_up(ws_wait);
@@ -948,7 +951,7 @@ static void free_workspaces(void)
                while (!list_empty(&wsm[i].idle_ws)) {
                        workspace = wsm[i].idle_ws.next;
                        list_del(workspace);
-                       btrfs_compress_op[i]->free_workspace(workspace);
+                       wsm[i].ops->free_workspace(workspace);
                        atomic_dec(&wsm[i].total_ws);
                }
        }
-- 
2.17.1