[PATCH 04/11] btrfs: unify compression ops with workspace_manager

Dennis Zhou
2019-01-28T21:25:47Z

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 <dennis@kernel.org>
---
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 bda7e8d2cbc7..b7e986e16640 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -777,6 +777,7 @@ 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 */
@@ -802,6 +803,8 @@ void __init btrfs_init_compress(void)
int i;

for (i = 0; i < BTRFS_COMPRESS_TYPES; 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);
@@ -811,7 +814,7 @@ 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 {
@@ -874,7 +877,7 @@ 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)) {
@@ -932,7 +935,7 @@ 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);
@@ -950,7 +953,7 @@ 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