4.5-stable review patch. If anyone has any objections, please let me know.
------------------ From: David Sterba <[email protected]> commit 059f791c6bbaba72dc3c1bd6e2657aacc8552849 upstream. Similar to __clear_extent_bit, do not fail if the state preallocation fails as we might not need it. One less BUG_ON. Signed-off-by: David Sterba <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- fs/btrfs/extent_io.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -875,8 +875,14 @@ __set_extent_bit(struct extent_io_tree * bits |= EXTENT_FIRST_DELALLOC; again: if (!prealloc && gfpflags_allow_blocking(mask)) { + /* + * Don't care for allocation failure here because we might end + * up not needing the pre-allocated extent state at all, which + * is the case if we only have in the tree extent states that + * cover our input range and don't cover too any other range. + * If we end up needing a new extent state we allocate it later. + */ prealloc = alloc_extent_state(mask); - BUG_ON(!prealloc); } spin_lock(&tree->lock);
