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    Subject[PATCH] btrfs/extent_io.c: return -ENOMEM instead of BUG_ON on allocation failure in set_extent_bit if __GFP_WAIT is set in the mask
    If __GFP_WAIT is set in the mask, set_extent_bit should return
    -ENOMEM to its caller to decide what to do on allocation failure,
    instead of BUG_ON.

    Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
    ---
    fs/btrfs/extent_io.c | 3 ++-
    1 files changed, 2 insertions(+), 1 deletions(-)

    diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
    index b67814c..fd2411e 100644
    --- a/fs/btrfs/extent_io.c
    +++ b/fs/btrfs/extent_io.c
    @@ -720,7 +720,8 @@ int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
    again:
    if (!prealloc && (mask & __GFP_WAIT)) {
    prealloc = alloc_extent_state(mask);
    - BUG_ON(!prealloc);
    + if (!prealloc)
    + return -ENOMEM;
    }

    spin_lock(&tree->lock);
    --
    1.7.1


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