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Commit 97d9a8a4 authored by Tsutomu Itoh's avatar Tsutomu Itoh Committed by root
Browse files

Btrfs: check return value of read_tree_block() 



This patch is checking return value of read_tree_block(),
and if it is NULL, error processing.

Signed-off-by: default avatarTsutomu Itoh <t-itoh@jp.fujitsu.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 7e75bf3f

fs/btrfs/ctree.c

+3 −0
Original line number Diff line number Diff line
@@ -682,6 +682,8 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans, 
			if (!cur) {

				cur = read_tree_block(root, blocknr,

							 blocksize, gen);

				if (!cur)

					return -EIO;

			} else if (!uptodate) {

				btrfs_read_buffer(cur, gen);

			}
@@ -4087,6 +4089,7 @@ int btrfs_search_forward(struct btrfs_root *root, struct btrfs_key *min_key, 
		}

		btrfs_set_path_blocking(path);

		cur = read_node_slot(root, cur, slot);

		BUG_ON(!cur);



		btrfs_tree_lock(cur);

fs/btrfs/extent-tree.c

+6 −0
Original line number Diff line number Diff line
@@ -6067,6 +6067,8 @@ static noinline int do_walk_down(struct btrfs_trans_handle *trans, 
		if (reada && level == 1)

			reada_walk_down(trans, root, wc, path);

		next = read_tree_block(root, bytenr, blocksize, generation);

		if (!next)

			return -EIO;

		btrfs_tree_lock(next);

		btrfs_set_lock_blocking(next);

	}
@@ -7937,6 +7939,10 @@ static noinline int relocate_one_extent(struct btrfs_root *extent_root, 


			eb = read_tree_block(found_root, block_start,

					     block_size, 0);

			if (!eb) {

				ret = -EIO;

				goto out;

			}

			btrfs_tree_lock(eb);

			BUG_ON(level != btrfs_header_level(eb));

fs/btrfs/relocation.c

+6 −0
Original line number Diff line number Diff line
@@ -1724,6 +1724,7 @@ int replace_path(struct btrfs_trans_handle *trans, 


			eb = read_tree_block(dest, old_bytenr, blocksize,

					     old_ptr_gen);

			BUG_ON(!eb);

			btrfs_tree_lock(eb);

			if (cow) {

				ret = btrfs_cow_block(trans, dest, eb, parent,
@@ -2513,6 +2514,10 @@ static int do_relocation(struct btrfs_trans_handle *trans, 
		blocksize = btrfs_level_size(root, node->level);

		generation = btrfs_node_ptr_generation(upper->eb, slot);

		eb = read_tree_block(root, bytenr, blocksize, generation);

		if (!eb) {

			err = -EIO;

			goto next;

		}

		btrfs_tree_lock(eb);

		btrfs_set_lock_blocking(eb);
@@ -2670,6 +2675,7 @@ static int get_tree_block_key(struct reloc_control *rc, 
	BUG_ON(block->key_ready);

	eb = read_tree_block(rc->extent_root, block->bytenr,

			     block->key.objectid, block->key.offset);

	BUG_ON(!eb);

	WARN_ON(btrfs_header_level(eb) != block->level);

	if (block->level == 0)

		btrfs_item_key_to_cpu(eb, &block->key, 0);