btrfs: use a normal workqueue for rmw_workers

rmw_workers doesn't need ordered execution or thread disabling threshold
(as the thresh parameter is less than DFT_THRESHOLD).

Just switch to the normal workqueues that use a lot less resources,
especially in the work_struct vs btrfs_work structures.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 6097166..f55b154 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -853,7 +853,7 @@ struct btrfs_fs_info {
        struct btrfs_workqueue *endio_workers;
        struct btrfs_workqueue *endio_meta_workers;
        struct btrfs_workqueue *endio_raid56_workers;
-       struct btrfs_workqueue *rmw_workers;
+       struct workqueue_struct *rmw_workers;
        struct btrfs_workqueue *endio_meta_write_workers;
        struct btrfs_workqueue *endio_write_workers;
        struct btrfs_workqueue *endio_freespace_worker;

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 807e7b2..7ce945d 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2283,7 +2283,8 @@ static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info)
        btrfs_destroy_workqueue(fs_info->workers);
        btrfs_destroy_workqueue(fs_info->endio_workers);
        btrfs_destroy_workqueue(fs_info->endio_raid56_workers);
-       btrfs_destroy_workqueue(fs_info->rmw_workers);
+       if (fs_info->rmw_workers)
+               destroy_workqueue(fs_info->rmw_workers);
        btrfs_destroy_workqueue(fs_info->endio_write_workers);
        btrfs_destroy_workqueue(fs_info->endio_freespace_worker);
        btrfs_destroy_workqueue(fs_info->delayed_workers);
@@ -2492,8 +2493,7 @@ static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info)
        fs_info->endio_raid56_workers =
                btrfs_alloc_workqueue(fs_info, "endio-raid56", flags,
                                      max_active, 4);
-       fs_info->rmw_workers =
-               btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2);
+       fs_info->rmw_workers = alloc_workqueue("btrfs-rmw", flags, max_active);
        fs_info->endio_write_workers =
                btrfs_alloc_workqueue(fs_info, "endio-write", flags,
                                      max_active, 2);

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 31f16f8..a5b623e 100644 (file)
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -88,7 +88,7 @@ struct btrfs_raid_bio {
        /*
         * for scheduling work in the helper threads
         */
-       struct btrfs_work work;
+       struct work_struct work;
 
        /*
         * bio list and bio_list_lock are used
@@ -196,8 +196,8 @@ struct btrfs_raid_bio {
 
 static int __raid56_parity_recover(struct btrfs_raid_bio *rbio);
 static noinline void finish_rmw(struct btrfs_raid_bio *rbio);
-static void rmw_work(struct btrfs_work *work);
-static void read_rebuild_work(struct btrfs_work *work);
+static void rmw_work(struct work_struct *work);
+static void read_rebuild_work(struct work_struct *work);
 static int fail_bio_stripe(struct btrfs_raid_bio *rbio, struct bio *bio);
 static int fail_rbio_index(struct btrfs_raid_bio *rbio, int failed);
 static void __free_raid_bio(struct btrfs_raid_bio *rbio);
@@ -206,12 +206,12 @@ static int alloc_rbio_pages(struct btrfs_raid_bio *rbio);
 
 static noinline void finish_parity_scrub(struct btrfs_raid_bio *rbio,
                                         int need_check);
-static void scrub_parity_work(struct btrfs_work *work);
+static void scrub_parity_work(struct work_struct *work);
 
-static void start_async_work(struct btrfs_raid_bio *rbio, btrfs_func_t work_func)
+static void start_async_work(struct btrfs_raid_bio *rbio, work_func_t work_func)
 {
-       btrfs_init_work(&rbio->work, work_func, NULL, NULL);
-       btrfs_queue_work(rbio->bioc->fs_info->rmw_workers, &rbio->work);
+       INIT_WORK(&rbio->work, work_func);
+       queue_work(rbio->bioc->fs_info->rmw_workers, &rbio->work);
 }
 
 /*
@@ -1745,7 +1745,7 @@ struct btrfs_plug_cb {
        struct blk_plug_cb cb;
        struct btrfs_fs_info *info;
        struct list_head rbio_list;
-       struct btrfs_work work;
+       struct work_struct work;
 };
 
 /*
@@ -1813,7 +1813,7 @@ static void run_plug(struct btrfs_plug_cb *plug)
  * if the unplug comes from schedule, we have to push the
  * work off to a helper thread
  */
-static void unplug_work(struct btrfs_work *work)
+static void unplug_work(struct work_struct *work)
 {
        struct btrfs_plug_cb *plug;
        plug = container_of(work, struct btrfs_plug_cb, work);
@@ -1826,9 +1826,8 @@ static void btrfs_raid_unplug(struct blk_plug_cb *cb, bool from_schedule)
        plug = container_of(cb, struct btrfs_plug_cb, cb);
 
        if (from_schedule) {
-               btrfs_init_work(&plug->work, unplug_work, NULL, NULL);
-               btrfs_queue_work(plug->info->rmw_workers,
-                                &plug->work);
+               INIT_WORK(&plug->work, unplug_work);
+               queue_work(plug->info->rmw_workers, &plug->work);
                return;
        }
        run_plug(plug);
@@ -2316,7 +2315,7 @@ int raid56_parity_recover(struct bio *bio, struct btrfs_io_context *bioc,
 
 }
 
-static void rmw_work(struct btrfs_work *work)
+static void rmw_work(struct work_struct *work)
 {
        struct btrfs_raid_bio *rbio;
 
@@ -2324,7 +2323,7 @@ static void rmw_work(struct btrfs_work *work)
        raid56_rmw_stripe(rbio);
 }
 
-static void read_rebuild_work(struct btrfs_work *work)
+static void read_rebuild_work(struct work_struct *work)
 {
        struct btrfs_raid_bio *rbio;
 
@@ -2781,7 +2780,7 @@ finish:
        validate_rbio_for_parity_scrub(rbio);
 }
 
-static void scrub_parity_work(struct btrfs_work *work)
+static void scrub_parity_work(struct work_struct *work)
 {
        struct btrfs_raid_bio *rbio;