diff options
Diffstat (limited to 'fs/btrfs/ctree.c')
| -rw-r--r-- | fs/btrfs/ctree.c | 28 |
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c index b0e18d986e0..d84089349c8 100644 --- a/fs/btrfs/ctree.c +++ b/fs/btrfs/ctree.c @@ -43,8 +43,6 @@ struct btrfs_path *btrfs_alloc_path(void) { struct btrfs_path *path; path = kmem_cache_zalloc(btrfs_path_cachep, GFP_NOFS); - if (path) - path->reada = 1; return path; } @@ -1224,6 +1222,7 @@ static void reada_for_search(struct btrfs_root *root, u64 search; u64 target; u64 nread = 0; + u64 gen; int direction = path->reada; struct extent_buffer *eb; u32 nr; @@ -1251,6 +1250,15 @@ static void reada_for_search(struct btrfs_root *root, nritems = btrfs_header_nritems(node); nr = slot; while (1) { + if (!node->map_token) { + unsigned long offset = btrfs_node_key_ptr_offset(nr); + map_private_extent_buffer(node, offset, + sizeof(struct btrfs_key_ptr), + &node->map_token, + &node->kaddr, + &node->map_start, + &node->map_len, KM_USER1); + } if (direction < 0) { if (nr == 0) break; @@ -1268,14 +1276,23 @@ static void reada_for_search(struct btrfs_root *root, search = btrfs_node_blockptr(node, nr); if ((search <= target && target - search <= 65536) || (search > target && search - target <= 65536)) { - readahead_tree_block(root, search, blocksize, - btrfs_node_ptr_generation(node, nr)); + gen = btrfs_node_ptr_generation(node, nr); + if (node->map_token) { + unmap_extent_buffer(node, node->map_token, + KM_USER1); + node->map_token = NULL; + } + readahead_tree_block(root, search, blocksize, gen); nread += blocksize; } nscan++; if ((nread > 65536 || nscan > 32)) break; } + if (node->map_token) { + unmap_extent_buffer(node, node->map_token, KM_USER1); + node->map_token = NULL; + } } /* @@ -1648,9 +1665,6 @@ again: } cow_done: BUG_ON(!cow && ins_len); - if (level != btrfs_header_level(b)) - WARN_ON(1); - level = btrfs_header_level(b); p->nodes[level] = b; if (!p->skip_locking) |