btrfs: get rid of unique workqueue helper functions

[ Upstream commit a0cac0ec961f0d42828eeef196ac2246a2f07659 ]

Commit 9e0af2376434 ("Btrfs: fix task hang under heavy compressed
write") worked around the issue that a recycled work item could get a
false dependency on the original work item due to how the workqueue code
guarantees non-reentrancy. It did so by giving different work functions
to different types of work.

However, the fixes in the previous few patches are more complete, as
they prevent a work item from being recycled at all (except for a tiny
window that the kernel workqueue code handles for us). This obsoletes
the previous fix, so we don't need the unique helpers for correctness.
The only other reason to keep them would be so they show up in stack
traces, but they always seem to be optimized to a tail call, so they
don't show up anyways. So, let's just get rid of the extra indirection.

While we're here, rename normal_work_helper() to the more informative
btrfs_work_helper().

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index 10a04b9..3f31109 100644 (file)
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -53,16 +53,6 @@ struct btrfs_workqueue {
        struct __btrfs_workqueue *high;
 };
 
-static void normal_work_helper(struct btrfs_work *work);
-
-#define BTRFS_WORK_HELPER(name)                                        \
-noinline_for_stack void btrfs_##name(struct work_struct *arg)          \
-{                                                                      \
-       struct btrfs_work *work = container_of(arg, struct btrfs_work,  \
-                                              normal_work);            \
-       normal_work_helper(work);                                       \
-}
-
 struct btrfs_fs_info *
 btrfs_workqueue_owner(const struct __btrfs_workqueue *wq)
 {
@@ -89,29 +79,6 @@ bool btrfs_workqueue_normal_congested(const struct btrfs_workqueue *wq)
        return atomic_read(&wq->normal->pending) > wq->normal->thresh * 2;
 }
 
-BTRFS_WORK_HELPER(worker_helper);
-BTRFS_WORK_HELPER(delalloc_helper);
-BTRFS_WORK_HELPER(flush_delalloc_helper);
-BTRFS_WORK_HELPER(cache_helper);
-BTRFS_WORK_HELPER(submit_helper);
-BTRFS_WORK_HELPER(fixup_helper);
-BTRFS_WORK_HELPER(endio_helper);
-BTRFS_WORK_HELPER(endio_meta_helper);
-BTRFS_WORK_HELPER(endio_meta_write_helper);
-BTRFS_WORK_HELPER(endio_raid56_helper);
-BTRFS_WORK_HELPER(endio_repair_helper);
-BTRFS_WORK_HELPER(rmw_helper);
-BTRFS_WORK_HELPER(endio_write_helper);
-BTRFS_WORK_HELPER(freespace_write_helper);
-BTRFS_WORK_HELPER(delayed_meta_helper);
-BTRFS_WORK_HELPER(readahead_helper);
-BTRFS_WORK_HELPER(qgroup_rescan_helper);
-BTRFS_WORK_HELPER(extent_refs_helper);
-BTRFS_WORK_HELPER(scrub_helper);
-BTRFS_WORK_HELPER(scrubwrc_helper);
-BTRFS_WORK_HELPER(scrubnc_helper);
-BTRFS_WORK_HELPER(scrubparity_helper);
-
 static struct __btrfs_workqueue *
 __btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info, const char *name,
                        unsigned int flags, int limit_active, int thresh)
@@ -302,12 +269,13 @@ static void run_ordered_work(struct __btrfs_workqueue *wq,
                         * original work item cannot depend on the recycled work
                         * item in that case (see find_worker_executing_work()).
                         *
-                        * Note that the work of one Btrfs filesystem may depend
-                        * on the work of another Btrfs filesystem via, e.g., a
-                        * loop device. Therefore, we must not allow the current
-                        * work item to be recycled until we are really done,
-                        * otherwise we break the above assumption and can
-                        * deadlock.
+                        * Note that different types of Btrfs work can depend on
+                        * each other, and one type of work on one Btrfs
+                        * filesystem may even depend on the same type of work
+                        * on another Btrfs filesystem via, e.g., a loop device.
+                        * Therefore, we must not allow the current work item to
+                        * be recycled until we are really done, otherwise we
+                        * break the above assumption and can deadlock.
                         */
                        free_self = true;
                } else {
@@ -331,8 +299,10 @@ static void run_ordered_work(struct __btrfs_workqueue *wq,
        }
 }
 
-static void normal_work_helper(struct btrfs_work *work)
+static void btrfs_work_helper(struct work_struct *normal_work)
 {
+       struct btrfs_work *work = container_of(normal_work, struct btrfs_work,
+                                              normal_work);
        struct __btrfs_workqueue *wq;
        void *wtag;
        int need_order = 0;
@@ -362,15 +332,13 @@ static void normal_work_helper(struct btrfs_work *work)
                trace_btrfs_all_work_done(wq->fs_info, wtag);
 }
 
-void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t uniq_func,
-                    btrfs_func_t func,
-                    btrfs_func_t ordered_func,
-                    btrfs_func_t ordered_free)
+void btrfs_init_work(struct btrfs_work *work, btrfs_func_t func,
+                    btrfs_func_t ordered_func, btrfs_func_t ordered_free)
 {
        work->func = func;
        work->ordered_func = ordered_func;
        work->ordered_free = ordered_free;
-       INIT_WORK(&work->normal_work, uniq_func);
+       INIT_WORK(&work->normal_work, btrfs_work_helper);
        INIT_LIST_HEAD(&work->ordered_list);
        work->flags = 0;
 }

diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 7861c9f..c5bf2b1 100644 (file)
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -29,42 +29,13 @@ struct btrfs_work {
        unsigned long flags;
 };
 
-#define BTRFS_WORK_HELPER_PROTO(name)                                  \
-void btrfs_##name(struct work_struct *arg)
-
-BTRFS_WORK_HELPER_PROTO(worker_helper);
-BTRFS_WORK_HELPER_PROTO(delalloc_helper);
-BTRFS_WORK_HELPER_PROTO(flush_delalloc_helper);
-BTRFS_WORK_HELPER_PROTO(cache_helper);
-BTRFS_WORK_HELPER_PROTO(submit_helper);
-BTRFS_WORK_HELPER_PROTO(fixup_helper);
-BTRFS_WORK_HELPER_PROTO(endio_helper);
-BTRFS_WORK_HELPER_PROTO(endio_meta_helper);
-BTRFS_WORK_HELPER_PROTO(endio_meta_write_helper);
-BTRFS_WORK_HELPER_PROTO(endio_raid56_helper);
-BTRFS_WORK_HELPER_PROTO(endio_repair_helper);
-BTRFS_WORK_HELPER_PROTO(rmw_helper);
-BTRFS_WORK_HELPER_PROTO(endio_write_helper);
-BTRFS_WORK_HELPER_PROTO(freespace_write_helper);
-BTRFS_WORK_HELPER_PROTO(delayed_meta_helper);
-BTRFS_WORK_HELPER_PROTO(readahead_helper);
-BTRFS_WORK_HELPER_PROTO(qgroup_rescan_helper);
-BTRFS_WORK_HELPER_PROTO(extent_refs_helper);
-BTRFS_WORK_HELPER_PROTO(scrub_helper);
-BTRFS_WORK_HELPER_PROTO(scrubwrc_helper);
-BTRFS_WORK_HELPER_PROTO(scrubnc_helper);
-BTRFS_WORK_HELPER_PROTO(scrubparity_helper);
-
-
 struct btrfs_workqueue *btrfs_alloc_workqueue(struct btrfs_fs_info *fs_info,
                                              const char *name,
                                              unsigned int flags,
                                              int limit_active,
                                              int thresh);
-void btrfs_init_work(struct btrfs_work *work, btrfs_work_func_t helper,
-                    btrfs_func_t func,
-                    btrfs_func_t ordered_func,
-                    btrfs_func_t ordered_free);
+void btrfs_init_work(struct btrfs_work *work, btrfs_func_t func,
+                    btrfs_func_t ordered_func, btrfs_func_t ordered_free);
 void btrfs_queue_work(struct btrfs_workqueue *wq,
                      struct btrfs_work *work);
 void btrfs_destroy_workqueue(struct btrfs_workqueue *wq);

diff --git a/fs/btrfs/block-group.c b/fs/btrfs/block-group.c
index 0d2da23..7dcfa7d 100644 (file)
--- a/fs/btrfs/block-group.c
+++ b/fs/btrfs/block-group.c
@@ -695,8 +695,7 @@ int btrfs_cache_block_group(struct btrfs_block_group_cache *cache,
        caching_ctl->block_group = cache;
        caching_ctl->progress = cache->key.objectid;
        refcount_set(&caching_ctl->count, 1);
-       btrfs_init_work(&caching_ctl->work, btrfs_cache_helper,
-                       caching_thread, NULL, NULL);
+       btrfs_init_work(&caching_ctl->work, caching_thread, NULL, NULL);
 
        spin_lock(&cache->lock);
        /*

diff --git a/fs/btrfs/delayed-inode.c b/fs/btrfs/delayed-inode.c
index 57a9ad3..c7a53e7 100644 (file)
--- a/fs/btrfs/delayed-inode.c
+++ b/fs/btrfs/delayed-inode.c
@@ -1367,8 +1367,8 @@ static int btrfs_wq_run_delayed_node(struct btrfs_delayed_root *delayed_root,
                return -ENOMEM;
 
        async_work->delayed_root = delayed_root;
-       btrfs_init_work(&async_work->work, btrfs_delayed_meta_helper,
-                       btrfs_async_run_delayed_root, NULL, NULL);
+       btrfs_init_work(&async_work->work, btrfs_async_run_delayed_root, NULL,
+                       NULL);
        async_work->nr = nr;
 
        btrfs_queue_work(fs_info->delayed_workers, &async_work->work);

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3895c21..bae3342 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -706,43 +706,31 @@ static void end_workqueue_bio(struct bio *bio)
        struct btrfs_end_io_wq *end_io_wq = bio->bi_private;
        struct btrfs_fs_info *fs_info;
        struct btrfs_workqueue *wq;
-       btrfs_work_func_t func;
 
        fs_info = end_io_wq->info;
        end_io_wq->status = bio->bi_status;
 
        if (bio_op(bio) == REQ_OP_WRITE) {
-               if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) {
+               if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA)
                        wq = fs_info->endio_meta_write_workers;
-                       func = btrfs_endio_meta_write_helper;
-               } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) {
+               else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE)
                        wq = fs_info->endio_freespace_worker;
-                       func = btrfs_freespace_write_helper;
-               } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
+               else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
                        wq = fs_info->endio_raid56_workers;
-                       func = btrfs_endio_raid56_helper;
-               } else {
+               else
                        wq = fs_info->endio_write_workers;
-                       func = btrfs_endio_write_helper;
-               }
        } else {
-               if (unlikely(end_io_wq->metadata ==
-                            BTRFS_WQ_ENDIO_DIO_REPAIR)) {
+               if (unlikely(end_io_wq->metadata == BTRFS_WQ_ENDIO_DIO_REPAIR))
                        wq = fs_info->endio_repair_workers;
-                       func = btrfs_endio_repair_helper;
-               } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) {
+               else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56)
                        wq = fs_info->endio_raid56_workers;
-                       func = btrfs_endio_raid56_helper;
-               } else if (end_io_wq->metadata) {
+               else if (end_io_wq->metadata)
                        wq = fs_info->endio_meta_workers;
-                       func = btrfs_endio_meta_helper;
-               } else {
+               else
                        wq = fs_info->endio_workers;
-                       func = btrfs_endio_helper;
-               }
        }
 
-       btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL);
+       btrfs_init_work(&end_io_wq->work, end_workqueue_fn, NULL, NULL);
        btrfs_queue_work(wq, &end_io_wq->work);
 }
 
@@ -835,8 +823,8 @@ blk_status_t btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct bio *bio,
        async->mirror_num = mirror_num;
        async->submit_bio_start = submit_bio_start;
 
-       btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start,
-                       run_one_async_done, run_one_async_free);
+       btrfs_init_work(&async->work, run_one_async_start, run_one_async_done,
+                       run_one_async_free);
 
        async->bio_offset = bio_offset;
 

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index bc6e7d1..dc14fc2 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1268,10 +1268,8 @@ static int cow_file_range_async(struct inode *inode, struct page *locked_page,
                async_chunk[i].write_flags = write_flags;
                INIT_LIST_HEAD(&async_chunk[i].extents);
 
-               btrfs_init_work(&async_chunk[i].work,
-                               btrfs_delalloc_helper,
-                               async_cow_start, async_cow_submit,
-                               async_cow_free);
+               btrfs_init_work(&async_chunk[i].work, async_cow_start,
+                               async_cow_submit, async_cow_free);
 
                nr_pages = DIV_ROUND_UP(cur_end - start, PAGE_SIZE);
                atomic_add(nr_pages, &fs_info->async_delalloc_pages);
@@ -2264,8 +2262,7 @@ int btrfs_writepage_cow_fixup(struct page *page, u64 start, u64 end)
 
        SetPageChecked(page);
        get_page(page);
-       btrfs_init_work(&fixup->work, btrfs_fixup_helper,
-                       btrfs_writepage_fixup_worker, NULL, NULL);
+       btrfs_init_work(&fixup->work, btrfs_writepage_fixup_worker, NULL, NULL);
        fixup->page = page;
        btrfs_queue_work(fs_info->fixup_workers, &fixup->work);
        return -EBUSY;
@@ -3258,7 +3255,6 @@ void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
        struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
        struct btrfs_ordered_extent *ordered_extent = NULL;
        struct btrfs_workqueue *wq;
-       btrfs_work_func_t func;
 
        trace_btrfs_writepage_end_io_hook(page, start, end, uptodate);
 
@@ -3267,16 +3263,12 @@ void btrfs_writepage_endio_finish_ordered(struct page *page, u64 start,
                                            end - start + 1, uptodate))
                return;
 
-       if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
+       if (btrfs_is_free_space_inode(BTRFS_I(inode)))
                wq = fs_info->endio_freespace_worker;
-               func = btrfs_freespace_write_helper;
-       } else {
+       else
                wq = fs_info->endio_write_workers;
-               func = btrfs_endio_write_helper;
-       }
 
-       btrfs_init_work(&ordered_extent->work, func, finish_ordered_fn, NULL,
-                       NULL);
+       btrfs_init_work(&ordered_extent->work, finish_ordered_fn, NULL, NULL);
        btrfs_queue_work(wq, &ordered_extent->work);
 }
 
@@ -8213,18 +8205,14 @@ static void __endio_write_update_ordered(struct inode *inode,
        struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
        struct btrfs_ordered_extent *ordered = NULL;
        struct btrfs_workqueue *wq;
-       btrfs_work_func_t func;
        u64 ordered_offset = offset;
        u64 ordered_bytes = bytes;
        u64 last_offset;
 
-       if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
+       if (btrfs_is_free_space_inode(BTRFS_I(inode)))
                wq = fs_info->endio_freespace_worker;
-               func = btrfs_freespace_write_helper;
-       } else {
+       else
                wq = fs_info->endio_write_workers;
-               func = btrfs_endio_write_helper;
-       }
 
        while (ordered_offset < offset + bytes) {
                last_offset = ordered_offset;
@@ -8232,9 +8220,8 @@ static void __endio_write_update_ordered(struct inode *inode,
                                                           &ordered_offset,
                                                           ordered_bytes,
                                                           uptodate)) {
-                       btrfs_init_work(&ordered->work, func,
-                                       finish_ordered_fn,
-                                       NULL, NULL);
+                       btrfs_init_work(&ordered->work, finish_ordered_fn, NULL,
+                                       NULL);
                        btrfs_queue_work(wq, &ordered->work);
                }
                /*
@@ -10119,8 +10106,7 @@ static struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode
        init_completion(&work->completion);
        INIT_LIST_HEAD(&work->list);
        work->inode = inode;
-       btrfs_init_work(&work->work, btrfs_flush_delalloc_helper,
-                       btrfs_run_delalloc_work, NULL, NULL);
+       btrfs_init_work(&work->work, btrfs_run_delalloc_work, NULL, NULL);
 
        return work;
 }

diff --git a/fs/btrfs/ordered-data.c b/fs/btrfs/ordered-data.c
index 24b6c72..6240a5a 100644 (file)
--- a/fs/btrfs/ordered-data.c
+++ b/fs/btrfs/ordered-data.c
@@ -547,7 +547,6 @@ u64 btrfs_wait_ordered_extents(struct btrfs_root *root, u64 nr,
                spin_unlock(&root->ordered_extent_lock);
 
                btrfs_init_work(&ordered->flush_work,
-                               btrfs_flush_delalloc_helper,
                                btrfs_run_ordered_extent_work, NULL, NULL);
                list_add_tail(&ordered->work_list, &works);
                btrfs_queue_work(fs_info->flush_workers, &ordered->flush_work);

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 3ad1516..27a903a 100644 (file)
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -3280,7 +3280,6 @@ qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
        memset(&fs_info->qgroup_rescan_work, 0,
               sizeof(fs_info->qgroup_rescan_work));
        btrfs_init_work(&fs_info->qgroup_rescan_work,
-                       btrfs_qgroup_rescan_helper,
                        btrfs_qgroup_rescan_worker, NULL, NULL);
        return 0;
 }

diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c
index 57a2ac7..8f47a85 100644 (file)
--- a/fs/btrfs/raid56.c
+++ b/fs/btrfs/raid56.c
@@ -190,7 +190,7 @@ static void scrub_parity_work(struct btrfs_work *work);
 
 static void start_async_work(struct btrfs_raid_bio *rbio, btrfs_func_t work_func)
 {
-       btrfs_init_work(&rbio->work, btrfs_rmw_helper, work_func, NULL, NULL);
+       btrfs_init_work(&rbio->work, work_func, NULL, NULL);
        btrfs_queue_work(rbio->fs_info->rmw_workers, &rbio->work);
 }
 
@@ -1743,8 +1743,7 @@ 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, btrfs_rmw_helper,
-                               unplug_work, NULL, NULL);
+               btrfs_init_work(&plug->work, unplug_work, NULL, NULL);
                btrfs_queue_work(plug->info->rmw_workers,
                                 &plug->work);
                return;

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index dd4f9c2..1feaead 100644 (file)
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -819,8 +819,7 @@ static void reada_start_machine(struct btrfs_fs_info *fs_info)
                /* FIXME we cannot handle this properly right now */
                BUG();
        }
-       btrfs_init_work(&rmw->work, btrfs_readahead_helper,
-                       reada_start_machine_worker, NULL, NULL);
+       btrfs_init_work(&rmw->work, reada_start_machine_worker, NULL, NULL);
        rmw->fs_info = fs_info;
 
        btrfs_queue_work(fs_info->readahead_workers, &rmw->work);

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index a0770a6..a7b043f 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -598,8 +598,8 @@ static noinline_for_stack struct scrub_ctx *scrub_setup_ctx(
                sbio->index = i;
                sbio->sctx = sctx;
                sbio->page_count = 0;
-               btrfs_init_work(&sbio->work, btrfs_scrub_helper,
-                               scrub_bio_end_io_worker, NULL, NULL);
+               btrfs_init_work(&sbio->work, scrub_bio_end_io_worker, NULL,
+                               NULL);
 
                if (i != SCRUB_BIOS_PER_SCTX - 1)
                        sctx->bios[i]->next_free = i + 1;
@@ -1720,8 +1720,7 @@ static void scrub_wr_bio_end_io(struct bio *bio)
        sbio->status = bio->bi_status;
        sbio->bio = bio;
 
-       btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper,
-                        scrub_wr_bio_end_io_worker, NULL, NULL);
+       btrfs_init_work(&sbio->work, scrub_wr_bio_end_io_worker, NULL, NULL);
        btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
 }
 
@@ -2203,8 +2202,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
                raid56_add_scrub_pages(rbio, spage->page, spage->logical);
        }
 
-       btrfs_init_work(&sblock->work, btrfs_scrub_helper,
-                       scrub_missing_raid56_worker, NULL, NULL);
+       btrfs_init_work(&sblock->work, scrub_missing_raid56_worker, NULL, NULL);
        scrub_block_get(sblock);
        scrub_pending_bio_inc(sctx);
        raid56_submit_missing_rbio(rbio);
@@ -2742,8 +2740,8 @@ static void scrub_parity_bio_endio(struct bio *bio)
 
        bio_put(bio);
 
-       btrfs_init_work(&sparity->work, btrfs_scrubparity_helper,
-                       scrub_parity_bio_endio_worker, NULL, NULL);
+       btrfs_init_work(&sparity->work, scrub_parity_bio_endio_worker, NULL,
+                       NULL);
        btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work);
 }
 

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e04409f..d8d7b1e 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -6676,8 +6676,7 @@ struct btrfs_device *btrfs_alloc_device(struct btrfs_fs_info *fs_info,
        else
                generate_random_uuid(dev->uuid);
 
-       btrfs_init_work(&dev->work, btrfs_submit_helper,
-                       pending_bios_fn, NULL, NULL);
+       btrfs_init_work(&dev->work, pending_bios_fn, NULL, NULL);
 
        return dev;
 }