From: David Sterba Date: Tue, 26 Apr 2016 23:03:45 +0000 (+0200) Subject: btrfs: make state preallocation more speculative in __set_extent_bit X-Git-Tag: v4.14-rc1~2972^2~13^2~1^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=059f791c6bbaba72dc3c1bd6e2657aacc8552849;p=platform%2Fkernel%2Flinux-rpi.git btrfs: make state preallocation more speculative in __set_extent_bit 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 --- diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index d39e224..8707bcc 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -873,8 +873,14 @@ __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, 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);