extent_buffers are global and shared so their pages should not belong to any particular cgroup (currently whichever cgroups happens to allocate the extent_buffer). Btrfs tree operations should not arbitrarily block on cgroup reclaim or have the shared extent_buffer pages on a cgroup's reclaim lists. Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx> Tested-by: syzbot@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Boris Burkov <boris@xxxxxx> --- fs/btrfs/disk-io.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 70fc4e7cc5a0..7fab5057cf8e 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1930,6 +1930,7 @@ static int btrfs_init_btree_inode(struct super_block *sb) BTRFS_I(inode)->root = btrfs_grab_root(fs_info->tree_root); set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); __insert_inode_hash(inode, hash); + set_bit(AS_KERNEL_FILE, &inode->i_mapping->flags); fs_info->btree_inode = inode; return 0; -- 2.50.1
