btrfs: preallocate radix tree node for global readahead tree

We can preallocate the node so insertion does not have to do that under
the lock. The GFP flags for the global radix tree are initialized to
 GFP_NOFS & ~__GFP_DIRECT_RECLAIM
but we can use GFP_KERNEL, because readahead is optional and not on any
critical writeout path.

Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bd415e1..12eba54 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2693,7 +2693,7 @@ int open_ctree(struct super_block *sb,
        fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL;
        fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */
        /* readahead state */
-       INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM);
+       INIT_RADIX_TREE(&fs_info->reada_tree, GFP_KERNEL);
        spin_lock_init(&fs_info->reada_lock);
 
        fs_info->thread_pool_size = min_t(unsigned long,

diff --git a/fs/btrfs/reada.c b/fs/btrfs/reada.c
index fdae8ca..a7fa4a5 100644 (file)
--- a/fs/btrfs/reada.c
+++ b/fs/btrfs/reada.c
@@ -393,6 +393,10 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
                goto error;
        }
 
+       ret = radix_tree_preload(GFP_KERNEL);
+       if (ret)
+               goto error;
+
        /* insert extent in reada_tree + all per-device trees, all or nothing */
        btrfs_dev_replace_lock(&fs_info->dev_replace, 0);
        spin_lock(&fs_info->reada_lock);
@@ -402,13 +406,16 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
                re_exist->refcnt++;
                spin_unlock(&fs_info->reada_lock);
                btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+               radix_tree_preload_end();
                goto error;
        }
        if (ret) {
                spin_unlock(&fs_info->reada_lock);
                btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
+               radix_tree_preload_end();
                goto error;
        }
+       radix_tree_preload_end();
        prev_dev = NULL;
        dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(
                        &fs_info->dev_replace);