btrfs: use normal workqueues for scrub

All three scrub workqueues don'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 aa3aea0..6097166 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -946,9 +946,9 @@ struct btrfs_fs_info {
         * running.
         */
        refcount_t scrub_workers_refcnt;
-       struct btrfs_workqueue *scrub_workers;
-       struct btrfs_workqueue *scrub_wr_completion_workers;
-       struct btrfs_workqueue *scrub_parity_workers;
+       struct workqueue_struct *scrub_workers;
+       struct workqueue_struct *scrub_wr_completion_workers;
+       struct workqueue_struct *scrub_parity_workers;
        struct btrfs_subpage_info *subpage_info;
 
        struct btrfs_discard_ctl discard_ctl;

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 6ac711f..3985225 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -90,7 +90,7 @@ struct scrub_bio {
        struct scrub_sector     *sectors[SCRUB_SECTORS_PER_BIO];
        int                     sector_count;
        int                     next_free;
-       struct btrfs_work       work;
+       struct work_struct      work;
 };
 
 struct scrub_block {
@@ -110,7 +110,7 @@ struct scrub_block {
                /* It is for the data with checksum */
                unsigned int    data_corrected:1;
        };
-       struct btrfs_work       work;
+       struct work_struct      work;
 };
 
 /* Used for the chunks with parity stripe such RAID5/6 */
@@ -132,7 +132,7 @@ struct scrub_parity {
        struct list_head        sectors_list;
 
        /* Work of parity check and repair */
-       struct btrfs_work       work;
+       struct work_struct      work;
 
        /* Mark the parity blocks which have data */
        unsigned long           *dbitmap;
@@ -231,7 +231,7 @@ static int scrub_sectors(struct scrub_ctx *sctx, u64 logical, u32 len,
                         u64 gen, int mirror_num, u8 *csum,
                         u64 physical_for_dev_replace);
 static void scrub_bio_end_io(struct bio *bio);
-static void scrub_bio_end_io_worker(struct btrfs_work *work);
+static void scrub_bio_end_io_worker(struct work_struct *work);
 static void scrub_block_complete(struct scrub_block *sblock);
 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
                               u64 extent_logical, u32 extent_len,
@@ -242,7 +242,7 @@ static int scrub_add_sector_to_wr_bio(struct scrub_ctx *sctx,
                                      struct scrub_sector *sector);
 static void scrub_wr_submit(struct scrub_ctx *sctx);
 static void scrub_wr_bio_end_io(struct bio *bio);
-static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
+static void scrub_wr_bio_end_io_worker(struct work_struct *work);
 static void scrub_put_ctx(struct scrub_ctx *sctx);
 
 static inline int scrub_is_page_on_raid56(struct scrub_sector *sector)
@@ -587,8 +587,7 @@ static noinline_for_stack struct scrub_ctx *scrub_setup_ctx(
                sbio->index = i;
                sbio->sctx = sctx;
                sbio->sector_count = 0;
-               btrfs_init_work(&sbio->work, scrub_bio_end_io_worker, NULL,
-                               NULL);
+               INIT_WORK(&sbio->work, scrub_bio_end_io_worker);
 
                if (i != SCRUB_BIOS_PER_SCTX - 1)
                        sctx->bios[i]->next_free = i + 1;
@@ -1718,11 +1717,11 @@ static void scrub_wr_bio_end_io(struct bio *bio)
        sbio->status = bio->bi_status;
        sbio->bio = bio;
 
-       btrfs_init_work(&sbio->work, scrub_wr_bio_end_io_worker, NULL, NULL);
-       btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
+       INIT_WORK(&sbio->work, scrub_wr_bio_end_io_worker);
+       queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
 }
 
-static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
+static void scrub_wr_bio_end_io_worker(struct work_struct *work)
 {
        struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
        struct scrub_ctx *sctx = sbio->sctx;
@@ -2119,10 +2118,10 @@ static void scrub_missing_raid56_end_io(struct bio *bio)
 
        bio_put(bio);
 
-       btrfs_queue_work(fs_info->scrub_workers, &sblock->work);
+       queue_work(fs_info->scrub_workers, &sblock->work);
 }
 
-static void scrub_missing_raid56_worker(struct btrfs_work *work)
+static void scrub_missing_raid56_worker(struct work_struct *work)
 {
        struct scrub_block *sblock = container_of(work, struct scrub_block, work);
        struct scrub_ctx *sctx = sblock->sctx;
@@ -2212,7 +2211,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
                raid56_add_scrub_pages(rbio, sector->page, 0, sector->logical);
        }
 
-       btrfs_init_work(&sblock->work, scrub_missing_raid56_worker, NULL, NULL);
+       INIT_WORK(&sblock->work, scrub_missing_raid56_worker);
        scrub_block_get(sblock);
        scrub_pending_bio_inc(sctx);
        raid56_submit_missing_rbio(rbio);
@@ -2332,10 +2331,10 @@ static void scrub_bio_end_io(struct bio *bio)
        sbio->status = bio->bi_status;
        sbio->bio = bio;
 
-       btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
+       queue_work(fs_info->scrub_workers, &sbio->work);
 }
 
-static void scrub_bio_end_io_worker(struct btrfs_work *work)
+static void scrub_bio_end_io_worker(struct work_struct *work)
 {
        struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
        struct scrub_ctx *sctx = sbio->sctx;
@@ -2765,7 +2764,7 @@ static void scrub_free_parity(struct scrub_parity *sparity)
        kfree(sparity);
 }
 
-static void scrub_parity_bio_endio_worker(struct btrfs_work *work)
+static void scrub_parity_bio_endio_worker(struct work_struct *work)
 {
        struct scrub_parity *sparity = container_of(work, struct scrub_parity,
                                                    work);
@@ -2786,9 +2785,8 @@ static void scrub_parity_bio_endio(struct bio *bio)
 
        bio_put(bio);
 
-       btrfs_init_work(&sparity->work, scrub_parity_bio_endio_worker, NULL,
-                       NULL);
-       btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work);
+       INIT_WORK(&sparity->work, scrub_parity_bio_endio_worker);
+       queue_work(fs_info->scrub_parity_workers, &sparity->work);
 }
 
 static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
@@ -3958,22 +3956,23 @@ static void scrub_workers_put(struct btrfs_fs_info *fs_info)
 {
        if (refcount_dec_and_mutex_lock(&fs_info->scrub_workers_refcnt,
                                        &fs_info->scrub_lock)) {
-               struct btrfs_workqueue *scrub_workers = NULL;
-               struct btrfs_workqueue *scrub_wr_comp = NULL;
-               struct btrfs_workqueue *scrub_parity = NULL;
-
-               scrub_workers = fs_info->scrub_workers;
-               scrub_wr_comp = fs_info->scrub_wr_completion_workers;
-               scrub_parity = fs_info->scrub_parity_workers;
+               struct workqueue_struct *scrub_workers = fs_info->scrub_workers;
+               struct workqueue_struct *scrub_wr_comp =
+                                               fs_info->scrub_wr_completion_workers;
+               struct workqueue_struct *scrub_parity =
+                                               fs_info->scrub_parity_workers;
 
                fs_info->scrub_workers = NULL;
                fs_info->scrub_wr_completion_workers = NULL;
                fs_info->scrub_parity_workers = NULL;
                mutex_unlock(&fs_info->scrub_lock);
 
-               btrfs_destroy_workqueue(scrub_workers);
-               btrfs_destroy_workqueue(scrub_wr_comp);
-               btrfs_destroy_workqueue(scrub_parity);
+               if (scrub_workers)
+                       destroy_workqueue(scrub_workers);
+               if (scrub_wr_comp)
+                       destroy_workqueue(scrub_wr_comp);
+               if (scrub_parity)
+                       destroy_workqueue(scrub_parity);
        }
 }
 
@@ -3983,9 +3982,9 @@ static void scrub_workers_put(struct btrfs_fs_info *fs_info)
 static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
                                                int is_dev_replace)
 {
-       struct btrfs_workqueue *scrub_workers = NULL;
-       struct btrfs_workqueue *scrub_wr_comp = NULL;
-       struct btrfs_workqueue *scrub_parity = NULL;
+       struct workqueue_struct *scrub_workers = NULL;
+       struct workqueue_struct *scrub_wr_comp = NULL;
+       struct workqueue_struct *scrub_parity = NULL;
        unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
        int max_active = fs_info->thread_pool_size;
        int ret = -ENOMEM;
@@ -3993,18 +3992,16 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
        if (refcount_inc_not_zero(&fs_info->scrub_workers_refcnt))
                return 0;
 
-       scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub", flags,
-                                             is_dev_replace ? 1 : max_active, 4);
+       scrub_workers = alloc_workqueue("btrfs-scrub", flags,
+                                       is_dev_replace ? 1 : max_active);
        if (!scrub_workers)
                goto fail_scrub_workers;
 
-       scrub_wr_comp = btrfs_alloc_workqueue(fs_info, "scrubwrc", flags,
-                                             max_active, 2);
+       scrub_wr_comp = alloc_workqueue("btrfs-scrubwrc", flags, max_active);
        if (!scrub_wr_comp)
                goto fail_scrub_wr_completion_workers;
 
-       scrub_parity = btrfs_alloc_workqueue(fs_info, "scrubparity", flags,
-                                            max_active, 2);
+       scrub_parity = alloc_workqueue("btrfs-scrubparity", flags, max_active);
        if (!scrub_parity)
                goto fail_scrub_parity_workers;
 
@@ -4025,11 +4022,11 @@ static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
        mutex_unlock(&fs_info->scrub_lock);
 
        ret = 0;
-       btrfs_destroy_workqueue(scrub_parity);
+       destroy_workqueue(scrub_parity);
 fail_scrub_parity_workers:
-       btrfs_destroy_workqueue(scrub_wr_comp);
+       destroy_workqueue(scrub_wr_comp);
 fail_scrub_wr_completion_workers:
-       btrfs_destroy_workqueue(scrub_workers);
+       destroy_workqueue(scrub_workers);
 fail_scrub_workers:
        return ret;
 }

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2236024..b1fdc6a 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1913,8 +1913,6 @@ 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_workqueue_set_max(fs_info->delayed_workers, new_pool_size);
-       btrfs_workqueue_set_max(fs_info->scrub_wr_completion_workers,
-                               new_pool_size);
 }
 
 static inline void btrfs_remount_begin(struct btrfs_fs_info *fs_info,