Btrfs: Don't wait on tree block writeback before freeing them anymore

This isn't required anymore because we don't reallocate blocks that
have already been written in this transaction.

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

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 618e526..1c3d9d6 100644 (file)
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -751,7 +751,6 @@ static int balance_level(struct btrfs_trans_handle *trans,
                add_root_to_dirty_list(root);
                path->nodes[level] = NULL;
                clean_tree_block(trans, root, mid);
-               wait_on_tree_block_writeback(root, mid);
                /* once for the path */
                free_extent_buffer(mid);
                ret = btrfs_free_extent(trans, root, mid->start, mid->len,
@@ -810,7 +809,6 @@ static int balance_level(struct btrfs_trans_handle *trans,
                        u32 blocksize = right->len;
 
                        clean_tree_block(trans, root, right);
-                       wait_on_tree_block_writeback(root, right);
                        free_extent_buffer(right);
                        right = NULL;
                        wret = del_ptr(trans, root, path, level + 1, pslot +
@@ -854,7 +852,6 @@ static int balance_level(struct btrfs_trans_handle *trans,
                u64 bytenr = mid->start;
                u32 blocksize = mid->len;
                clean_tree_block(trans, root, mid);
-               wait_on_tree_block_writeback(root, mid);
                free_extent_buffer(mid);
                mid = NULL;
                wret = del_ptr(trans, root, path, level + 1, pslot);
@@ -2638,7 +2635,6 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                } else {
                        u64 root_gen = btrfs_header_generation(path->nodes[1]);
                        clean_tree_block(trans, root, leaf);
-                       wait_on_tree_block_writeback(root, leaf);
                        wret = del_ptr(trans, root, path, 1, path->slots[1]);
                        if (wret)
                                ret = wret;
@@ -2690,7 +2686,6 @@ int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
                                                           path->nodes[1]);
 
                                clean_tree_block(trans, root, leaf);
-                               wait_on_tree_block_writeback(root, leaf);
 
                                wret = del_ptr(trans, root, path, 1, slot);
                                if (wret)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4e5bd62..76fd5d7 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -1887,7 +1887,6 @@ struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
        }
        btrfs_set_header_generation(buf, trans->transid);
        clean_tree_block(trans, root, buf);
-       wait_on_tree_block_writeback(root, buf);
        btrfs_set_buffer_uptodate(buf);
 
        if (PageDirty(buf->first_page)) {

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 3e1f21c..5632ea7 100644 (file)
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -383,9 +383,11 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
        struct btrfs_csum_item *item;
        struct btrfs_path *path = NULL;
        u32 csum;
+
        if (btrfs_test_opt(root, NODATASUM) ||
            btrfs_test_flag(inode, NODATASUM))
                return 0;
+
        mutex_lock(&root->fs_info->fs_mutex);
        path = btrfs_alloc_path();
        item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);