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    Subject[PATCH 09/11] ocfs2_dlmfs: Don't honor truncate. The size of a dlmfs file is LVB_LEN
    Date
    We want folks using dlmfs to be able to use the LVB in places other than
    just write(2)/read(2). By ignoring truncate requests, we allow 'echo
    "contents" > /dlm/space/lockname' to work.

    Signed-off-by: Joel Becker <joel.becker@oracle.com>
    ---
    fs/ocfs2/dlmfs/dlmfs.c | 18 ++++++++++++++++++
    1 files changed, 18 insertions(+), 0 deletions(-)

    diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
    index e21ce0e..13ac2bf 100644
    --- a/fs/ocfs2/dlmfs/dlmfs.c
    +++ b/fs/ocfs2/dlmfs/dlmfs.c
    @@ -220,6 +220,23 @@ static int dlmfs_file_release(struct inode *inode,
    return 0;
    }

    +/*
    + * We do ->setattr() just to override size changes. Our size is the size
    + * of the LVB and nothing else.
    + */
    +static int dlmfs_file_setattr(struct dentry *dentry, struct iattr *attr)
    +{
    + int error;
    + struct inode *inode = dentry->d_inode;
    +
    + attr->ia_valid &= ~ATTR_SIZE;
    + error = inode_change_ok(inode, attr);
    + if (!error)
    + error = inode_setattr(inode, attr);
    +
    + return error;
    +}
    +
    static unsigned int dlmfs_file_poll(struct file *file, poll_table *wait)
    {
    int event = 0;
    @@ -634,6 +651,7 @@ static const struct super_operations dlmfs_ops = {

    static const struct inode_operations dlmfs_file_inode_operations = {
    .getattr = simple_getattr,
    + .setattr = dlmfs_file_setattr,
    };

    static int dlmfs_get_sb(struct file_system_type *fs_type,
    --
    1.6.6.1


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