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    Subject[patch 5/5] Btrfs: pass __GFP_WRITE for buffered write page allocations
    Date
    From: Johannes Weiner <jweiner@redhat.com>

    Tell the page allocator that pages allocated for a buffered write are
    expected to become dirty soon.

    Signed-off-by: Johannes Weiner <jweiner@redhat.com>
    Reviewed-by: Rik van Riel <riel@redhat.com>
    Acked-by: Mel Gorman <mgorman@suse.de>
    ---
    fs/btrfs/file.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
    index dafdfa0..d673f4a 100644
    --- a/fs/btrfs/file.c
    +++ b/fs/btrfs/file.c
    @@ -1081,7 +1081,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
    again:
    for (i = 0; i < num_pages; i++) {
    pages[i] = find_or_create_page(inode->i_mapping, index + i,
    - mask);
    + mask | __GFP_WRITE);
    if (!pages[i]) {
    faili = i - 1;
    err = -ENOMEM;
    --
    1.7.6.4


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