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    Subject[PATCH 20/39] ovl: add ovl_fallocate()
    Date
    Implement stacked fallocate.

    Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
    ---
    fs/overlayfs/file.c | 24 ++++++++++++++++++++++++
    1 file changed, 24 insertions(+)

    diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
    index 4057bbf2e141..069599d53511 100644
    --- a/fs/overlayfs/file.c
    +++ b/fs/overlayfs/file.c
    @@ -282,6 +282,29 @@ static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
    return ret;
    }

    +static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
    +{
    + struct inode *inode = file_inode(file);
    + struct fd real;
    + const struct cred *old_cred;
    + int ret;
    +
    + ret = ovl_real_fdget(file, &real);
    + if (ret)
    + return ret;
    +
    + old_cred = ovl_override_creds(file_inode(file)->i_sb);
    + ret = vfs_fallocate(real.file, mode, offset, len);
    + revert_creds(old_cred);
    +
    + /* Update size */
    + ovl_copyattr(ovl_inode_real(inode), inode);
    +
    + fdput(real);
    +
    + return ret;
    +}
    +
    const struct file_operations ovl_file_operations = {
    .open = ovl_open,
    .release = ovl_release,
    @@ -290,4 +313,5 @@ const struct file_operations ovl_file_operations = {
    .write_iter = ovl_write_iter,
    .fsync = ovl_fsync,
    .mmap = ovl_mmap,
    + .fallocate = ovl_fallocate,
    };
    --
    2.14.3
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