Commit d8926bb3 authored by Mark Fasheh's avatar Mark Fasheh
Browse files

btrfs: don't BUG_ON btrfs_alloc_path() errors 



This patch fixes many callers of btrfs_alloc_path() which BUG_ON allocation
failure. All the sites that are fixed in this patch were checked by me to
be fairly trivial to fix because of at least one of two criteria:

 - Callers of the function catch errors from it already so bubbling the
   error up will be handled.
 - Callers of the function might BUG_ON any nonzero return code in which
   case there is no behavior changed (but we still got to remove a BUG_ON)

The following functions were updated:

btrfs_lookup_extent, alloc_reserved_tree_block, btrfs_remove_block_group,
btrfs_lookup_csums_range, btrfs_csum_file_blocks, btrfs_mark_extent_written,
btrfs_inode_by_name, btrfs_new_inode, btrfs_symlink,
insert_reserved_file_extent, and run_delalloc_nocow

Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
parent 8d86e5f9

fs/btrfs/extent-tree.c

+9 −3
Original line number Diff line number Diff line
@@ -667,7 +667,9 @@ int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len) 
	struct btrfs_path *path;



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	key.objectid = start;

	key.offset = len;

	btrfs_set_key_type(&key, BTRFS_EXTENT_ITEM_KEY);
@@ -5494,7 +5496,8 @@ static int alloc_reserved_tree_block(struct btrfs_trans_handle *trans, 
	u32 size = sizeof(*extent_item) + sizeof(*block_info) + sizeof(*iref);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	path->leave_spinning = 1;

	ret = btrfs_insert_empty_item(trans, fs_info->extent_root, path,
@@ -7162,7 +7165,10 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans, 
	spin_unlock(&cluster->refill_lock);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path) {

		ret = -ENOMEM;

		goto out;

	}



	inode = lookup_free_space_inode(root, block_group, path);

	if (!IS_ERR(inode)) {

fs/btrfs/file-item.c

+5 −2
Original line number Diff line number Diff line
@@ -282,7 +282,8 @@ int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, 
	u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	if (search_commit) {

		path->skip_locking = 1;
@@ -672,7 +673,9 @@ int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, 
		btrfs_super_csum_size(&root->fs_info->super_copy);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	sector_sum = sums->sums;

again:

	next_offset = (u64)-1;

fs/btrfs/file.c

+2 −1
Original line number Diff line number Diff line
@@ -855,7 +855,8 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans, 
	btrfs_drop_extent_cache(inode, start, end - 1, 0);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;

again:

	recow = 0;

	split = start;

fs/btrfs/inode.c

+13 −5
Original line number Diff line number Diff line
@@ -1070,7 +1070,8 @@ static noinline int run_delalloc_nocow(struct inode *inode, 
	u64 ino = btrfs_ino(inode);



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	nolock = is_free_space_inode(root, inode);
@@ -1644,7 +1645,8 @@ static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, 
	int ret;



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	path->leave_spinning = 1;
@@ -3713,7 +3715,8 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, 
	int ret = 0;



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return -ENOMEM;



	di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name,

				    namelen, 0);
@@ -4438,7 +4441,8 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, 
	int owner;



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path)

		return ERR_PTR(-ENOMEM);



	inode = new_inode(root->fs_info->sb);

	if (!inode) {
@@ -7194,7 +7198,11 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry, 
		goto out_unlock;



	path = btrfs_alloc_path();

	BUG_ON(!path);

	if (!path) {

		err = -ENOMEM;

		drop_inode = 1;

		goto out_unlock;

	}

	key.objectid = btrfs_ino(inode);

	key.offset = 0;

	btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);

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