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    Subject[PATCH 5/6] Btrfs: fail if we try to use hole punch
    Date
    Btrfs doesn't have the ability to punch holes yet, so make sure we return
    EOPNOTSUPP if we try to use hole punching through fallocate. This support can
    be added later. Thanks,

    Signed-off-by: Josef Bacik <josef@redhat.com>
    ---
    fs/btrfs/inode.c | 4 ++++
    1 files changed, 4 insertions(+), 0 deletions(-)

    diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
    index 78877d7..c590add 100644
    --- a/fs/btrfs/inode.c
    +++ b/fs/btrfs/inode.c
    @@ -6936,6 +6936,10 @@ static long btrfs_fallocate(struct inode *inode, int mode,
    alloc_start = offset & ~mask;
    alloc_end = (offset + len + mask) & ~mask;

    + /* We only support the FALLOC_FL_KEEP_SIZE mode */
    + if (mode && (mode & FALLOC_FL_KEEP_SIZE))
    + return -EOPNOTSUPP;
    +
    /*
    * wait for ordered IO before we have any locks. We'll loop again
    * below with the locks held.
    --
    1.6.6.1


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