Btrfs: Give all the worker threads descriptive names

Signed-off-by: Chris Mason <chris.mason@oracle.com>

3 files changed, 24 insertions, 10 deletions

diff --git a/fs/btrfs/async-thread.c b/fs/btrfs/async-thread.c
index bc2980c433ef..5f2f5a8c2289 100644
--- a/fs/btrfs/async-thread.c
+++ b/fs/btrfs/async-thread.c
@@ -153,7 +153,7 @@ int btrfs_stop_workers(struct btrfs_workers *workers)
 /*
  * simple init on struct btrfs_workers
  */
-void btrfs_init_workers(struct btrfs_workers *workers, int max)
+void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max)
 {
         workers->num_workers = 0;
         INIT_LIST_HEAD(&workers->worker_list);
@@ -161,6 +161,7 @@ void btrfs_init_workers(struct btrfs_workers *workers, int max)
         spin_lock_init(&workers->lock);
         workers->max_workers = max;
         workers->idle_thresh = 32;
+        workers->name = name;
 }
 
 /*
@@ -184,7 +185,9 @@ int btrfs_start_workers(struct btrfs_workers *workers, int num_workers)
                 INIT_LIST_HEAD(&worker->worker_list);
                 spin_lock_init(&worker->lock);
                 atomic_set(&worker->num_pending, 0);
-                worker->task = kthread_run(worker_loop, worker, "btrfs");
+                worker->task = kthread_run(worker_loop, worker,
+                                           "btrfs-%s-%d", workers->name,
+                                           workers->num_workers + i);
                 worker->workers = workers;
                 if (IS_ERR(worker->task)) {
                         kfree(worker);
diff --git a/fs/btrfs/async-thread.h b/fs/btrfs/async-thread.h
index 3436ff897597..43e44d115dd1 100644
--- a/fs/btrfs/async-thread.h
+++ b/fs/btrfs/async-thread.h
@@ -69,11 +69,14 @@ struct btrfs_workers {
 
         /* lock for finding the next worker thread to queue on */
         spinlock_t lock;
+
+        /* extra name for this worker */
+        char *name;
 };
 
 int btrfs_queue_worker(struct btrfs_workers *workers, struct btrfs_work *work);
 int btrfs_start_workers(struct btrfs_workers *workers, int num_workers);
 int btrfs_stop_workers(struct btrfs_workers *workers);
-void btrfs_init_workers(struct btrfs_workers *workers, int max);
+void btrfs_init_workers(struct btrfs_workers *workers, char *name, int max);
 int btrfs_requeue_work(struct btrfs_work *work);
 #endif
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 9601b13c7d7a..1bf210dadef6 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -492,11 +492,11 @@ static int __btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
 
         /*
          * when we're called for a write, we're already in the async
-         * submission context.  Just jump ingo btrfs_map_bio
+         * submission context.  Just jump into btrfs_map_bio
          */
         if (rw & (1 << BIO_RW)) {
                 return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
-                                     mirror_num, 0);
+                                     mirror_num, 1);
         }
 
         /*
@@ -528,6 +528,12 @@ static int btree_writepage(struct page *page, struct writeback_control *wbc)
 {
         struct extent_io_tree *tree;
         tree = &BTRFS_I(page->mapping->host)->io_tree;
+
+        if (current->flags & PF_MEMALLOC) {
+                redirty_page_for_writepage(wbc, page);
+                unlock_page(page);
+                return 0;
+        }
         return extent_write_full_page(tree, page, btree_get_extent, wbc);
 }
 
@@ -1363,8 +1369,9 @@ struct btrfs_root *open_ctree(struct super_block *sb,
          * queue work function gets called at interrupt time, and so it
          * cannot dynamically grow.
          */
-        btrfs_init_workers(&fs_info->workers, fs_info->thread_pool_size);
-        btrfs_init_workers(&fs_info->submit_workers,
+        btrfs_init_workers(&fs_info->workers, "worker",
+                           fs_info->thread_pool_size);
+        btrfs_init_workers(&fs_info->submit_workers, "submit",
                            min_t(u64, fs_devices->num_devices,
                            fs_info->thread_pool_size));
 
@@ -1374,9 +1381,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
          */
         fs_info->submit_workers.idle_thresh = 64;
 
-        btrfs_init_workers(&fs_info->fixup_workers, 1);
-        btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
-        btrfs_init_workers(&fs_info->endio_write_workers,
+        btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1);
+        btrfs_init_workers(&fs_info->endio_workers, "endio",
+                           fs_info->thread_pool_size);
+        btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
                            fs_info->thread_pool_size);
 
         /*