tree 97cc477d3597187e4aa4e450ba74e06f7eda4f35
parent 1b9845081633072c18f30d8cfd09c267adf0b109
author Omar Sandoval <osandov@osandov.com> 1424774824 -0800
committer Chris Mason <clm@fb.com> 1430054820 -0700

btrfs: handle ENOMEM in btrfs_alloc_tree_block

This is one of the first places to give out when memory is tight. Handle
it properly rather than with a BUG_ON.

Also fix the comment about the return value, which is an ERR_PTR, not
NULL, on error.

Signed-off-by: Omar Sandoval <osandov@osandov.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>